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openwrt-xburst/target/linux/ep93xx/patches-2.6.30/002-lcd-linux-hd44780.patch
florian 288fe38045 [ep93xx] add support for the Simplemachines Sim.One board 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18540 3c298f89-4303-0410-b956-a3cf2f4a3e73
2009-11-25 23:43:48 +00:00

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118 KiB
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Index: linux-2.6.30.9/arch/arm/Kconfig
===================================================================
--- linux-2.6.30.9.orig/arch/arm/Kconfig 2009-10-05 17:38:08.000000000 +0200
+++ linux-2.6.30.9/arch/arm/Kconfig 2009-11-24 02:01:42.000000000 +0100
@@ -1407,6 +1407,8 @@
source "drivers/accessibility/Kconfig"
+source "drivers/lcd-linux/Kconfig"
+
source "drivers/leds/Kconfig"
source "drivers/rtc/Kconfig"
Index: linux-2.6.30.9/drivers/Makefile
===================================================================
--- linux-2.6.30.9.orig/drivers/Makefile 2009-10-05 17:38:08.000000000 +0200
+++ linux-2.6.30.9/drivers/Makefile 2009-11-24 02:01:42.000000000 +0100
@@ -106,4 +106,5 @@
obj-$(CONFIG_SSB) += ssb/
obj-$(CONFIG_VIRTIO) += virtio/
obj-$(CONFIG_STAGING) += staging/
+obj-$(CONFIG_LCD_LINUX) += lcd-linux/
obj-y += platform/
Index: linux-2.6.30.9/drivers/lcd-linux/Config.in
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/Config.in 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,8 @@
+if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
+ mainmenu_option next_comment
+ comment 'LCD support'
+
+ tristate 'LCD-Linux layer' CONFIG_LCD_LINUX
+ dep_tristate ' HD44780 controller' CONFIG_LCD_HD44780 $CONFIG_LCD_LINUX
+ endmenu
+fi
Index: linux-2.6.30.9/drivers/lcd-linux/Kconfig
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/Kconfig 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,33 @@
+menu "LCD-Linux support"
+ depends on EXPERIMENTAL
+
+config LCD_LINUX
+ tristate "LCD-Linux layer"
+ default m
+ help
+ LCD-Linux provides an easy way to drive LCD displays under
+ Linux by creating a character which can be read or written.
+ It features complete VT102 emulation and recognizes
+ many escape sequences. If you want to use it you must also
+ choose an appropriate driver, otherwise it will not be
+ very useful. For more information see
+ http://lcd-linux.sourceforge.net/
+
+ To compile LCD-Linux as a module, choose M here:
+ the module will be called lcd-linux.
+
+config LCD_HD44780
+ tristate "HD44780 controller"
+ depends on LCD_LINUX && MACH_SIM_ONE
+ default m
+ help
+ This is a LCD-Linux driver for LCD displays based on the
+ Hitachi HD44780 (and compatible) controllers connected
+ to the SimOne LCD port.
+
+ To compile this driver as a module, choose M here:
+ the module will be called hd44780.
+
+ If unsure, say N.
+
+endmenu
Index: linux-2.6.30.9/drivers/lcd-linux/Makefile
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/Makefile 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,8 @@
+#
+#
+# Standard Makefile to statically compile LCD-Linux into the kernel
+# Linux 2.6
+
+obj-$(CONFIG_LCD_LINUX) += lcd-linux.o
+obj-$(CONFIG_LCD_HD44780) += hd44780.o
+
Index: linux-2.6.30.9/drivers/lcd-linux/cgram/default.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/cgram/default.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,37 @@
+/* default.h
+ *
+ *
+ *
+ * Default user defined characters for lcdmod.
+ *
+ * Copyright (C) by Michael McLellan (mikey@cs.auckland.ac.nz)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ */
+
+static void init_charmap(void)
+{
+}
+
+static unsigned char cg0[] = { 0x1f, 0x1f, 0x11, 0x0f, 0x11, 0x1e, 0x01, 0x1f };
+static unsigned char cg1[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f };
+static unsigned char cg2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x1f };
+static unsigned char cg3[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x1f, 0x1f };
+static unsigned char cg4[] = { 0x00, 0x00, 0x00, 0x00, 0x1f, 0x1f, 0x1f, 0x1f };
+static unsigned char cg5[] = { 0x00, 0x00, 0x00, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f };
+static unsigned char cg6[] = { 0x00, 0x00, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f };
+static unsigned char cg7[] = { 0x00, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f };
Index: linux-2.6.30.9/drivers/lcd-linux/charmap.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/charmap.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,79 @@
+/* charmap.h
+ *
+ *
+ *
+ * Character mapping for HD44780 devices by Mark Haemmerling <mail@markh.de>.
+ *
+ * Translates ISO 8859-1 to HD44780 charset.
+ * HD44780 charset reference: http://markh.de/hd44780-charset.png
+ *
+ * Initial table taken from lcd.o Linux kernel driver by
+ * Nils Faerber <nilsf@users.sourceforge.net>. Thanks!
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ * Following translations are being performed:
+ * - maps umlaut accent characters to the corresponding umlaut characters
+ * - maps other accent characters to the characters without accents
+ * - maps beta (=ringel-S), micro and Yen
+ *
+ * Alternative mappings:
+ * - #112 ("p") -> #240 (large "p"), orig. mapped -> #112
+ * - #113 ("q") -> #241 (large "q"), orig. mapped -> #113
+ *
+ * HD44780 misses backslash
+ *
+ */
+
+static unsigned char charmap[] = {
+
+/* 0 - 31 */
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+
+/* 32 - 63 */
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+
+/* 64 - 95 */
+ 64, 65, 66, 67, 68, 69, 70, 71,
+ 72, 73, 74, 75, 76, 77, 78, 79,
+ 80, 81, 82, 83, 84, 85, 86, 87,
+ 88, 89, 90, 91, 47, 93, 94, 95,
+
+/* 96 - 127 */
+ 96, 97, 98, 99, 100, 101, 102, 103,
+104, 105, 106, 107, 108, 109, 110, 111,
+112, 113, 114, 115, 116, 117, 118, 119,
+120, 121, 122, 123, 124, 125, 126, 127,
+
+/* 128 - 159 */
+128, 129, 130, 131, 132, 133, 134, 135,
+136, 137, 138, 139, 140, 141, 142, 143,
+144, 145, 146, 147, 148, 149, 150, 151,
+152, 153, 154, 155, 156, 157, 158, 159,
+
+/* 160 - 191 */
+160, 33, 236, 237, 164, 92, 124, 167,
+ 34, 169, 170, 171, 172, 173, 174, 175,
+223, 177, 178, 179, 39, 249, 247, 165,
+ 44, 185, 186, 187, 188, 189, 190, 63,
+
+/* 192 - 223 */
+ 65, 65, 65, 65, 225, 65, 65, 67,
+ 69, 69, 69, 69, 73, 73, 73, 73,
+ 68, 78, 79, 79, 79, 79, 239, 120,
+ 48, 85, 85, 85, 245, 89, 240, 226,
+
+/* 224 - 255 */
+ 97, 97, 97, 97, 225, 97, 97, 99,
+101, 101, 101, 101, 105, 105, 105, 105,
+111, 110, 111, 111, 111, 111, 239, 253,
+ 48, 117, 117, 117, 245, 121, 240, 255
+
+};
Index: linux-2.6.30.9/drivers/lcd-linux/commands.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/commands.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,77 @@
+/* commands.h
+ *
+ *
+ *
+ * LCD-Linux:
+ * Driver for HD44780 compatible displays connected to the parallel port.
+ *
+ * HD44780 commands.
+ *
+ * Copyright (C) 2004 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef HD44780_COMMANDS_H
+#define HD44780_COMMANDS_H
+
+/*** HD44780 Command Set ***/
+
+/* Clear Display*/
+#define CLR_DISP 0x01 /* Clear entire display; cursor at row 0, column 0 */
+
+/* Return Home */
+#define RET_HOME 0x02 /* Cursor at row 0, column 0; display content doesn't change */
+
+/* Entry Mode Set */
+#define ENTRY_MODE_SET 0x04
+#define DISP_SHIFT_ON (ENTRY_MODE_SET | 0x01) /* Shift display, not cursor after data write */
+#define DISP_SHIFT_OFF (ENTRY_MODE_SET | 0x00) /* Shift cursor, not display after data write */
+#define CURS_INC (ENTRY_MODE_SET | 0x02) /* Shift on the right after data read/write */
+#define CURS_DEC (ENTRY_MODE_SET | 0x00) /* Shift on the left after data read/write */
+
+/* Display on/off Control */
+#define DISP_ONOFF_CNTR 0x08
+#define BLINK_ON (DISP_ONOFF_CNTR | 0x01) /* Cursor blinking on */
+#define BLINK_OFF (DISP_ONOFF_CNTR | 0x00) /* Cursor blinking off */
+#define CURS_ON (DISP_ONOFF_CNTR | 0x02) /* Display Cursor */
+#define CURS_OFF (DISP_ONOFF_CNTR | 0x00) /* Hide Cursor */
+#define DISP_ON (DISP_ONOFF_CNTR | 0x04) /* Turn on display updating */
+#define DISP_OFF (DISP_ONOFF_CNTR | 0x00) /* Freeze display content */
+
+/* Cursor or Display Shift */
+#define CURS_DISP_SHIFT 0x10
+#define SHIFT_RIGHT (CURS_DISP_SHIFT | 0x04) /* Shift on the right */
+#define SHIFT_LEFT (CURS_DISP_SHIFT | 0x00) /* Shift on the left */
+#define SHIFT_DISP (CURS_DISP_SHIFT | 0x08) /* Shift display */
+#define SHIFT_CURS (CURS_DISP_SHIFT | 0x00) /* Shift cursor */
+
+/* Function Set */
+#define FUNC_SET 0x20
+#define FONT_5X10 (FUNC_SET | 0x04) /* Select 5x10 dots font */
+#define FONT_5X8 (FUNC_SET | 0x00) /* Select 5x8 dots font */
+#define DISP_2_LINES (FUNC_SET | 0x08) /* Select 2 lines display (only 5x8 font allowed) */
+#define DISP_1_LINE (FUNC_SET | 0x00) /* Select 1 line display */
+#define BUS_8_BITS (FUNC_SET | 0x10) /* Set 8 data bits */
+#define BUS_4_BITS (FUNC_SET | 0x00) /* Set 4 data bits */
+
+/* Set CGRAM Address */
+#define CGRAM_IO 0x40 /* Base CGRAM address */
+
+/* Set DDRAM Address */
+#define DDRAM_IO 0x80 /* Base DDRAM address */
+
+#endif /* commands included */
Index: linux-2.6.30.9/drivers/lcd-linux/config.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/config.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,73 @@
+/* config.h
+ *
+ *
+ *
+ * Configure file for LCD-Linux. Here you must specify your hardware setup and
+ * timings constants. The default values will probably be right for you.
+ *
+ * Copyright (C) 2005 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ */
+
+/* Setup the default user defined characters in CGRAM */
+#include "cgram/default.h"
+
+/* Don't modify the default timing constants
+ * unless you know what you are doing.
+ */
+
+/* Execution times (in microseconds) */
+#define T_READ 60 /* Read execution time (min 43 us) */
+#define T_WRITE 60 /* Write execution time (min 43 us) */
+#define T_BF 2 /* Busy flag polling time (min 1 us) */
+
+/* Timings in nanoseconds */
+#define T_AS 200 /* Address set-up time (min 140 ns) */
+#define T_EH 500 /* Enable high time (min 450 ns) */
+#define T_EL 600 /* Enable low time (min 500 ns) */
+
+/* Various constants */
+#define DFLT_NUM_CNTR 1 /* Default number of controllers the display has */
+#define DFLT_CNTR_ROWS 2 /* Default number of rows per controller */
+#define DFLT_CNTR_COLS 16 /* Default number of columns the display has */
+#define DFLT_VS_ROWS 25 /* Default number of rows for the virtual screen */
+#define DFLT_VS_COLS 80 /* Default number of columns for the virtual screen */
+#define DFLT_TABSTOP 3 /* Default length of tabs */
+#define DFLT_FLAGS (HD44780_CHECK_BF | HD44780_4BITS_BUS ) /* Default flags */
+
+#define MAX_CNTR_ROWS 4 /* The HD44780 supports up to 4 lines as a fake 2 lines mode */
+#define MAX_CNTR_COLS 80 /* The HD44780 supports up to 80 characters (1*80; 2*40; etc) */
+
+#define SETUP 4
+#define HIGH_NIBBLE_WRITE(x) (((x) >> (4-SETUP)) & (0x0f << SETUP))
+#define LOW_NIBBLE_WRITE(x) (((x) << SETUP) & (0x0f << SETUP))
+#define HIGH_NIBBLE_READ(x) (((x) & (0x0f << SETUP)) << (4-SETUP))
+#define LOW_NIBBLE_READ(x) (((x) & (0x0f << SETUP)) >> SETUP)
+
+
+#define SIMONE_LCD_RS EP93XX_GPIO_LINE_A(2) /* OUT */
+#define SIMONE_LCD_RD EP93XX_GPIO_LINE_A(3) /* OUT */
+#define SIMONE_LCD_EN EP93XX_GPIO_LINE_B(4) /* EGPIO12 OUT */
+#define SIMONE_LCD_BCKLIGHT EP93XX_GPIO_LINE_B(5) /* EGPIO13 OUT */
+
+#define SIMONE_LCD_DATA0 EP93XX_GPIO_LINE_A(4)
+#define SIMONE_LCD_DATA1 EP93XX_GPIO_LINE_A(5)
+#define SIMONE_LCD_DATA2 EP93XX_GPIO_LINE_A(6)
+#define SIMONE_LCD_DATA3 EP93XX_GPIO_LINE_A(7)
+
+
Index: linux-2.6.30.9/drivers/lcd-linux/hd44780.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/hd44780.c 2009-11-24 02:05:29.000000000 +0100
@@ -0,0 +1,860 @@
+/* hd44780.c
+ *
+ *
+ *
+ * LCD-Linux:
+ * Driver for HD44780 compatible displays connected to the parallel port.
+ *
+ * Copyright (C) 2005 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ * Adapted to Sim.One Hardware by Nuccio Raciti (raciti.nuccio@gmail.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+
+#include <linux/autoconf.h>
+
+
+#ifdef CONFIG_PROC_FS
+#define USE_PROC
+#else
+#undef USE_PROC
+#endif
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/delay.h>
+#include <linux/fs.h>
+
+#include <asm/uaccess.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <linux/ioport.h>
+#include <asm/gpio.h>
+
+#ifdef USE_PROC
+#include <linux/proc_fs.h>
+#endif
+
+#define LCD_LINUX_MAIN
+#include <linux/hd44780.h>
+
+#include "charmap.h"
+#include "commands.h"
+#include "config.h"
+
+/** Function prototypes **/
+static void read_display(unsigned char *byte, unsigned char bitmask);
+static void write_display(unsigned char byte, unsigned char bitmask);
+
+/* Initialization */
+static int hd44780_validate_driver(void);
+static int hd44780_init_port(void);
+static int hd44780_cleanup_port(void);
+static int hd44780_init_display(void);
+static int hd44780_cleanup_display(void);
+
+/* Write */
+static void hd44780_address_mode(int);
+static void hd44780_clear_display(void);
+static void hd44780_write_char(unsigned int, unsigned short);
+static void hd44780_write_cgram_char(unsigned char, unsigned char *);
+
+/* Read */
+static void check_bf(unsigned char);
+static void hd44780_read_char(unsigned int, unsigned short *);
+static void hd44780_read_cgram_char(unsigned char, unsigned char *);
+
+/* Input handling */
+static int hd44780_handle_custom_char(unsigned int);
+static int hd44780_handle_custom_ioctl(unsigned int,unsigned long , unsigned int);
+
+/* Proc operations */
+#ifdef USE_PROC
+static void create_proc_entries(void);
+static void remove_proc_entries(void);
+#endif
+
+/* hd44780 access */
+#define ACCESS_TO_READ 0
+#define ACCESS_TO_WRITE 1
+#define ACCESS_TO_DATA 2
+
+/* hd44780_flags */
+#define _CHECK_BF 0 /* Do busy-flag checking */
+#define _4BITS_BUS 1 /* The bus is 4 bits long */
+#define _5X10_FONT 2 /* Use 5x10 font */
+#define CURSOR_BLINK 3 /* Make the cursor blinking */
+#define SHOW_CURSOR 4 /* Make the cursor visible */
+#define DISPLAY_ON 5 /* Display status: on or off */
+#define INC_ADDR 6 /* Increment address after data read/write */
+#define BACKLIGHT 7 /* Display backlight: on or off */
+#define CGRAM_STATE 9 /* Controller status bitmask (bits 9->15): DDRAM or CGRAM access */
+#define ESC_MASK 0x00ff0000
+#define PROC_MASK 0x0f000000
+
+#define SET_STATE(state, mask) (hd44780_flags = (hd44780_flags & ~(mask)) | ((state) & (mask)))
+#define SET_ESC_STATE(state) SET_STATE((state) << 16, ESC_MASK)
+#define SET_PROC_LEVEL(level) SET_STATE((level) << 24, PROC_MASK)
+#define ESC_STATE ((hd44780_flags & ESC_MASK) >> 16)
+#define PROC_LEVEL ((hd44780_flags & PROC_MASK) >> 24)
+
+/* globals */
+static unsigned int disp_size; /* Display size (rows*columns) */
+static unsigned int disp_offset[1]; /* Physical cursor position on the display */
+static unsigned long hd44780_flags; /* Driver flags for internal use only */
+
+static struct lcd_parameters par = {
+ .name = HD44780_STRING,
+ .minor = HD44780_MINOR,
+ .flags = DFLT_FLAGS,
+ .tabstop = DFLT_TABSTOP,
+ .num_cntr = 1,
+ .cntr_rows = DFLT_CNTR_ROWS,
+ .cntr_cols = DFLT_CNTR_COLS,
+ .vs_rows = DFLT_VS_ROWS,
+ .vs_cols = DFLT_VS_COLS,
+ .cgram_chars = 8,
+ .cgram_bytes = 8,
+ .cgram_char0 = 0,
+};
+/* End of globals */
+
+#ifdef MODULE
+#include <linux/device.h>
+MODULE_ALIAS_CHARDEV(LCD_MAJOR, HD44780_MINOR);
+#include <linux/kmod.h>
+
+static unsigned short flags = DFLT_FLAGS;
+static unsigned short tabstop = DFLT_TABSTOP;
+static unsigned short cntr_rows = DFLT_CNTR_ROWS;
+static unsigned short cntr_cols = DFLT_CNTR_COLS;
+static unsigned short vs_rows = DFLT_VS_ROWS;
+static unsigned short vs_cols = DFLT_VS_COLS;
+static unsigned short minor = HD44780_MINOR;
+
+MODULE_DESCRIPTION("LCD SimOne driver for HD44780 compatible controllers.");
+MODULE_AUTHOR("Nuccio Raciti (raciti.nuccio@gmail.com)");
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+module_param(flags, ushort, 0444);
+module_param(cntr_rows, ushort, 0444);
+module_param(cntr_cols, ushort, 0444);
+module_param(vs_rows, ushort, 0444);
+module_param(vs_cols, ushort, 0444);
+module_param(tabstop, ushort, 0444);
+module_param(minor, ushort, 0444);
+
+MODULE_PARM_DESC(flags, "Various flags (see Documentation)");
+MODULE_PARM_DESC(cntr_rows, "Number of rows per controller on the LCD: 1, 2, 4 (default: " string(DFLT_CNTR_ROWS) ")");
+MODULE_PARM_DESC(cntr_cols, "Number of columns on the LCD (default: " string(DFLT_CNTR_COLS) ", max: " string(MAX_CNTR_COLS) ")");
+MODULE_PARM_DESC(vs_rows, "Number of rows of the virtual screen (default: " string(DFLT_VS_ROWS) ")");
+MODULE_PARM_DESC(vs_cols, "Number of columns of the virtual screen (default: " string(DFLT_VS_COLS) ")");
+MODULE_PARM_DESC(tabstop, "Tab character length (default: " string(DFLT_TABSTOP) ")");
+MODULE_PARM_DESC(minor, "Assigned minor number (default: " string(HD44780_MINOR) ")");
+#else
+
+/*
+ * Parse boot command line
+ *
+ * hd44780=cntr_rows,cntr_cols,vs_rows,vs_cols,flags,minor,tabstop
+ */
+static int __init hd44780_boot_init(char *cmdline)
+{
+ char *str = cmdline;
+ int idx = 0;
+ unsigned short *args[] = {
+ &par.cntr_rows,
+ &par.cntr_cols,
+ &par.vs_rows,
+ &par.vs_cols,
+ &par.flags,
+ &par.num_cntr,
+ &par.minor,
+ &par.tabstop,
+ };
+
+ while (*cmdline && idx < (sizeof(args)/sizeof(unsigned short *))) {
+ switch (*str) {
+ case ',':
+ *str++ = 0;
+ case 0:
+ if (strlen(cmdline))
+ *args[idx] = simple_strtoul(cmdline, NULL, 0);
+ ++idx;
+ cmdline = str;
+ break;
+ default:
+ ++str;
+ break;
+ }
+ }
+
+ return (1);
+}
+
+__setup("hd44780=", hd44780_boot_init);
+#endif /* MODULE */
+
+/* Macros for iterator handling */
+static inline unsigned int iterator_inc_(unsigned int iterator, const unsigned int module)
+{
+ return ((++iterator)%module);
+}
+
+static inline unsigned int iterator_dec_(unsigned int iterator, const unsigned int module)
+{
+ return (iterator ? --iterator : module-1);
+}
+
+#define iterator_inc(iterator, module) (iterator = iterator_inc_(iterator, module))
+#define iterator_dec(iterator, module) (iterator = iterator_dec_(iterator, module))
+
+static inline void set_lines(unsigned char bitmask)
+{
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+
+ if(bitmask & ACCESS_TO_WRITE ) {
+ gpio_direction_output (SIMONE_LCD_DATA0 , 0);
+ gpio_direction_output (SIMONE_LCD_DATA1 , 0);
+ gpio_direction_output (SIMONE_LCD_DATA2 , 0);
+ gpio_direction_output (SIMONE_LCD_DATA3 , 0);
+ gpio_set_value(SIMONE_LCD_RD, 0); /* Write */
+ } else {
+
+ gpio_direction_input (SIMONE_LCD_DATA0);
+ gpio_direction_input (SIMONE_LCD_DATA1);
+ gpio_direction_input (SIMONE_LCD_DATA2);
+ gpio_direction_input (SIMONE_LCD_DATA3);
+ gpio_set_value(SIMONE_LCD_RD, 1); /* Read */
+ }
+
+ if(bitmask & ACCESS_TO_DATA )
+ gpio_set_value(SIMONE_LCD_RS, 1); /* Data */
+ else
+ gpio_set_value(SIMONE_LCD_RS, 0); /* Cmds*/
+
+ if(test_bit(BACKLIGHT, &hd44780_flags))
+ gpio_set_value(SIMONE_LCD_BCKLIGHT, 1);
+ else
+ gpio_set_value(SIMONE_LCD_BCKLIGHT, 0);
+}
+
+
+/* Low level read from the display */
+static inline unsigned char __read_display(unsigned char bitmask)
+{
+ unsigned char byte;
+
+ set_lines (bitmask);
+
+ ndelay(T_AS); /* Address set-up time */
+ gpio_set_value(SIMONE_LCD_EN, 1); /* Enable */
+ ndelay(T_EH);/* Enable high time */
+
+ byte = (gpio_get_value(SIMONE_LCD_DATA0) << 4);
+ byte |= (gpio_get_value(SIMONE_LCD_DATA1) << 5);
+ byte |= (gpio_get_value(SIMONE_LCD_DATA2) << 6);
+ byte |= (gpio_get_value(SIMONE_LCD_DATA3) << 7);
+
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+
+ ndelay(T_EL); /* Enable low time */
+
+
+ return (byte);
+
+}
+
+/* Low level write to the display */
+static inline void __write_display(unsigned char data, unsigned char bitmask)
+{
+ set_lines(bitmask);
+
+ if(data & 0x10)
+ gpio_set_value(SIMONE_LCD_DATA0, 1);
+ else
+ gpio_set_value(SIMONE_LCD_DATA0, 0);
+
+ if(data & 0x20)
+ gpio_set_value(SIMONE_LCD_DATA1, 1);
+ else
+ gpio_set_value(SIMONE_LCD_DATA1, 0);
+
+ if(data & 0x40)
+ gpio_set_value(SIMONE_LCD_DATA2, 1);
+ else
+ gpio_set_value(SIMONE_LCD_DATA2, 0);
+
+ if(data & 0x80)
+ gpio_set_value(SIMONE_LCD_DATA3, 1);
+ else
+ gpio_set_value(SIMONE_LCD_DATA3, 0);
+
+ ndelay(T_AS); /* Address set-up time */
+ gpio_set_value(SIMONE_LCD_EN, 1);
+ ndelay(T_EH); /* Enable high time */
+
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+ ndelay(T_EL); /* Enable low time */
+}
+
+
+/* Read data from the display (4 bit bus, check busy flag) */
+static void read_display (unsigned char *byte,unsigned char bitmask)
+{
+ if(bitmask) check_bf(bitmask);
+ *byte = HIGH_NIBBLE_READ(__read_display(bitmask));
+ if(bitmask) check_bf(bitmask);
+ *byte |= LOW_NIBBLE_READ(__read_display(bitmask));
+}
+
+
+/* Output commands or data to the display (4 bit bus, check busy flag) */
+static void write_display(unsigned char byte,unsigned char bitmask)
+{
+ check_bf(bitmask);
+ __write_display(HIGH_NIBBLE_WRITE(byte),bitmask);
+ check_bf(bitmask);
+ __write_display(LOW_NIBBLE_WRITE(byte),bitmask);
+}
+
+
+/* Read Address Counter AC from the display */
+static unsigned char read_ac(unsigned char bitmask)
+{
+ unsigned char byte;
+
+ read_display(&byte, bitmask);
+
+ return (byte);
+}
+
+
+/* Do busy-flag check */
+static void check_bf(unsigned char bitmask)
+{
+ unsigned int timeout = 20;
+ static unsigned char do_check_bf = 5;
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+
+ gpio_direction_input (SIMONE_LCD_DATA0);
+ gpio_direction_input (SIMONE_LCD_DATA1);
+ gpio_direction_input (SIMONE_LCD_DATA2);
+ gpio_direction_input (SIMONE_LCD_DATA3);
+
+ gpio_set_value(SIMONE_LCD_RD, 1); /* Read */
+ gpio_set_value(SIMONE_LCD_RS, 0); /* Instru */
+
+ ndelay(T_AS); /* Address set-up time */
+ gpio_set_value(SIMONE_LCD_EN, 1); /* Enable */
+ ndelay(T_EH);/* Enable high time */
+
+ do{
+ udelay(T_BF);
+ } while (gpio_get_value(SIMONE_LCD_DATA3) && --timeout);
+
+ if (! timeout) {
+ if (! --do_check_bf) {
+ printk(KERN_NOTICE "hd44780 error: is the LCD connected?\n");
+ }
+ }
+
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+
+ ndelay(T_EL); /* Enable low time */
+}
+
+/* Send commands to the display */
+static void write_command(unsigned char command)
+{
+ write_display(command, ACCESS_TO_WRITE);
+
+ if (command <= 0x03)
+ mdelay(2);
+}
+
+static inline void set_cursor(unsigned int offset)
+{
+ unsigned int disp_number = offset/disp_size;
+ unsigned int local_offset = offset%disp_size;
+
+ if (disp_offset[disp_number] != local_offset || test_bit(CGRAM_STATE+disp_number, &hd44780_flags)) {
+ unsigned int disp_row = local_offset/par.cntr_cols;
+ unsigned int disp_column = local_offset%par.cntr_cols;
+
+ write_command(DDRAM_IO | ((disp_row%2)*0x40) | (((disp_row >= 2)*par.cntr_cols)+disp_column));
+ clear_bit(CGRAM_STATE+disp_number, &hd44780_flags);
+ disp_offset[disp_number] = local_offset;
+ }
+}
+
+/* HD44780 DDRAM addresses are consecutive only when
+ * the cursor moves on the same row of the display.
+ * Every time the row of the cursor changes we invalidate
+ * the cursor position to force hardware cursor repositioning.
+ */
+static inline void mov_cursor(unsigned int disp_number)
+{
+ if (test_bit(INC_ADDR, &hd44780_flags)) {
+ iterator_inc(disp_offset[disp_number], disp_size);
+ if (disp_offset[disp_number]%par.cntr_cols == 0)
+ disp_offset[disp_number] = disp_size;
+ } else {
+ iterator_dec(disp_offset[disp_number], disp_size);
+ if (disp_offset[disp_number]%par.cntr_cols == par.cntr_cols-1)
+ disp_offset[disp_number] = disp_size;
+ }
+}
+
+static struct lcd_driver hd44780 = {
+ .read_char = hd44780_read_char,
+ .read_cgram_char = hd44780_read_cgram_char,
+ .write_char = hd44780_write_char,
+ .write_cgram_char = hd44780_write_cgram_char,
+ .address_mode = hd44780_address_mode,
+ .clear_display = hd44780_clear_display,
+ .validate_driver = hd44780_validate_driver,
+ .init_display = hd44780_init_display,
+ .cleanup_display = hd44780_cleanup_display,
+ .init_port = hd44780_init_port,
+ .cleanup_port = hd44780_cleanup_port,
+ .handle_custom_char = hd44780_handle_custom_char,
+ .handle_custom_ioctl = hd44780_handle_custom_ioctl,
+
+ .charmap = charmap,
+};
+
+static void hd44780_read_char(unsigned int offset, unsigned short *data)
+{
+ unsigned int disp_number = offset/disp_size;
+ unsigned char tmp;
+
+ set_cursor(offset);
+ read_display(&tmp, ACCESS_TO_DATA);
+ *data = tmp;
+ mov_cursor(disp_number);
+}
+
+static void hd44780_read_cgram_char(unsigned char index, unsigned char *pixels)
+{
+ unsigned int i;
+
+ write_command(CGRAM_IO | (index << 3));
+ set_bit(CGRAM_STATE+0, &hd44780_flags);
+
+ for (i = 0; i < 8; ++i) {
+ read_display(pixels+i, ACCESS_TO_DATA );
+ pixels[i] &= 0x1f;
+ }
+}
+
+static void hd44780_write_char(unsigned int offset, unsigned short data)
+{
+ unsigned int disp_number = offset/disp_size;
+
+ set_cursor(offset);
+ write_display(data & 0xff, ACCESS_TO_WRITE | ACCESS_TO_DATA );
+ mov_cursor(disp_number);
+}
+
+static void hd44780_write_cgram_char(unsigned char index, unsigned char *pixels)
+{
+ unsigned int i;
+
+ /* Move address pointer to index in CGRAM */
+ write_command(CGRAM_IO | (index << 3));
+
+ set_bit(CGRAM_STATE+0, &hd44780_flags);
+
+ for (i = 0; i < 8; ++i) {
+ pixels[i] &= 0x1f;
+ write_display(pixels[i], ACCESS_TO_WRITE | ACCESS_TO_DATA );
+ }
+}
+
+/* Increment/decrement address mode after a data read/write */
+static void hd44780_address_mode(int mode)
+{
+ if (mode > 0 && ! test_bit(INC_ADDR, &hd44780_flags)) {
+ write_command(CURS_INC | DISP_SHIFT_OFF);
+ set_bit(INC_ADDR, &hd44780_flags);
+ } else if (mode < 0 && test_bit(INC_ADDR, &hd44780_flags)) {
+ write_command(CURS_DEC | DISP_SHIFT_OFF);
+ clear_bit(INC_ADDR, &hd44780_flags);
+ }
+}
+
+static void hd44780_clear_display(void)
+{
+ write_command(CLR_DISP);
+ if (! test_bit(INC_ADDR, &hd44780_flags))
+ write_command(CURS_DEC | DISP_SHIFT_OFF);
+ memset(disp_offset, 0, sizeof(disp_offset));
+}
+
+static int hd44780_validate_driver(void)
+{
+ if (par.cntr_rows != 1 && par.cntr_rows != 2 && par.cntr_rows != 4)
+ par.cntr_rows = DFLT_CNTR_ROWS;
+
+ if (par.cntr_rows != 1)
+ par.flags &= ~HD44780_5X10_FONT;
+
+
+ if (! par.cntr_cols || par.cntr_cols > MAX_CNTR_COLS/par.cntr_rows)
+ par.cntr_cols = MAX_CNTR_COLS/par.cntr_rows;
+
+ disp_size = par.cntr_rows*par.cntr_cols;
+
+ /* These parameters depend on the hardware and cannot be changed */
+ par.cgram_chars = 8;
+ par.cgram_bytes = 8;
+ par.cgram_char0 = 0;
+
+ return (0);
+}
+
+/* Send init commands to the display */
+static void write_init_command(void)
+{
+ unsigned char command = 0x30;
+
+ __write_display(HIGH_NIBBLE_WRITE(command), ACCESS_TO_WRITE);
+ mdelay(20); /* Wait more than 4.1 ms */
+ __write_display(HIGH_NIBBLE_WRITE(command), ACCESS_TO_WRITE);
+ udelay(200); /* Wait more than 100 us */
+ __write_display(HIGH_NIBBLE_WRITE(command), ACCESS_TO_WRITE);
+ udelay(200); /* Wait more than 100 us */
+ command = BUS_4_BITS;
+ command |= ((par.cntr_rows == 1) ? DISP_1_LINE : DISP_2_LINES);
+ command |= (test_bit(_5X10_FONT, &hd44780_flags) ? FONT_5X10 : FONT_5X8);
+ write_command(command);
+ /* set_bit(BACKLIGHT, &hd44780_flags); */
+}
+
+static int hd44780_init_display(void)
+{
+ if (par.flags & HD44780_CHECK_BF)
+ set_bit(_CHECK_BF, &hd44780_flags);
+ else
+ clear_bit(_CHECK_BF, &hd44780_flags);
+
+ if (par.flags & HD44780_4BITS_BUS)
+ set_bit(_4BITS_BUS, &hd44780_flags);
+ else
+ clear_bit(_4BITS_BUS, &hd44780_flags);
+
+ if (par.flags & HD44780_5X10_FONT)
+ set_bit(_5X10_FONT, &hd44780_flags);
+ else
+ clear_bit(_5X10_FONT, &hd44780_flags);
+
+ write_init_command();
+
+ hd44780_clear_display();
+ hd44780_address_mode(1);
+ write_command(DISP_ON | CURS_OFF | BLINK_OFF);
+ set_bit(DISPLAY_ON, &hd44780_flags);
+ clear_bit(SHOW_CURSOR, &hd44780_flags);
+ clear_bit(CURSOR_BLINK, &hd44780_flags);
+
+ /* Set the CGRAM to default values */
+ hd44780_write_cgram_char(0, cg0);
+ hd44780_write_cgram_char(1, cg1);
+ hd44780_write_cgram_char(2, cg2);
+ hd44780_write_cgram_char(3, cg3);
+ hd44780_write_cgram_char(4, cg4);
+ hd44780_write_cgram_char(5, cg5);
+ hd44780_write_cgram_char(6, cg6);
+ hd44780_write_cgram_char(7, cg7);
+ init_charmap();
+
+ return (0);
+}
+
+static int hd44780_cleanup_display(void)
+{
+ hd44780_clear_display();
+
+ return (0);
+}
+
+static int hd44780_init_port(void)
+{
+ gpio_direction_output (SIMONE_LCD_BCKLIGHT, 0);
+ gpio_direction_output (SIMONE_LCD_RD , 0);
+ gpio_direction_output (SIMONE_LCD_RS , 0);
+ gpio_direction_output (SIMONE_LCD_EN , 0);
+ gpio_set_value(SIMONE_LCD_EN, 0); /* Disable */
+
+ return (0);
+}
+
+static int hd44780_cleanup_port(void)
+{
+
+ gpio_direction_input (SIMONE_LCD_BCKLIGHT);
+ gpio_direction_input (SIMONE_LCD_RD);
+ gpio_direction_input (SIMONE_LCD_RS);
+ gpio_direction_input (SIMONE_LCD_EN);
+ gpio_direction_input (SIMONE_LCD_DATA0);
+ gpio_direction_input (SIMONE_LCD_DATA1);
+ gpio_direction_input (SIMONE_LCD_DATA2);
+ gpio_direction_input (SIMONE_LCD_DATA3);
+ return (0);
+}
+
+static void display_attr(unsigned char input)
+{
+ unsigned char command;
+
+ switch (ESC_STATE) {
+ case 'a': /* Turn on/off the display cursor */
+ if (input == '1')
+ set_bit(SHOW_CURSOR, &hd44780_flags);
+ else if (input == '0')
+ clear_bit(SHOW_CURSOR, &hd44780_flags);
+ break;
+ case 'b': /* Turn on/off the display cursor blinking */
+ if (input == '1')
+ set_bit(CURSOR_BLINK, &hd44780_flags);
+ else if (input == '0')
+ clear_bit(CURSOR_BLINK, &hd44780_flags);
+ break;
+ case 'h': /* Turn on/off the display */
+ if (input == '1')
+ set_bit(DISPLAY_ON, &hd44780_flags);
+ else if (input == '0')
+ clear_bit(DISPLAY_ON, &hd44780_flags);
+ break;
+ }
+
+ command = (test_bit(DISPLAY_ON, &hd44780_flags) ? DISP_ON : DISP_OFF);
+ command |= (test_bit(SHOW_CURSOR, &hd44780_flags) ? CURS_ON : CURS_OFF);
+ command |= (test_bit(CURSOR_BLINK, &hd44780_flags) ? BLINK_ON : BLINK_OFF);
+
+ if (ESC_STATE == 'h')
+ write_command(command);
+}
+
+static int hd44780_handle_custom_char(unsigned int _input)
+{
+ unsigned char input = _input & 0xff;
+
+ if (_input & (~0xff)) {
+ switch (ESC_STATE) {
+ case 'a': /* Turn on/off the display cursor */
+ case 'b': /* Turn on/off the display cursor blinking */
+ case 'h': /* Turn on/off the the display */
+ display_attr(input);
+ return (0);
+ case 'l': /* Turn on/off the backlight */
+ if (input == '1')
+ set_bit(BACKLIGHT, &hd44780_flags);
+ else if (input == '0')
+ clear_bit(BACKLIGHT, &hd44780_flags);
+ read_ac(ACCESS_TO_READ);
+ return (0);
+ }
+ }
+
+ switch (input) {
+ case 'a': /* Turn on/off the display cursor */
+ case 'b': /* Turn on/off the display cursor blinking */
+ case 'h': /* Turn on/off the display */
+ case 'l': /* Turn on/off the backlight */
+ SET_ESC_STATE(input);
+ return (1);
+ case 'd': /* Shift display cursor Right */
+ write_command(SHIFT_CURS | SHIFT_RIGHT);
+ return (0);
+ case 'e': /* Shift display cursor Left */
+ write_command(SHIFT_CURS | SHIFT_LEFT);
+ return (0);
+ case 'f': /* Shift display Right */
+ write_command(SHIFT_DISP | SHIFT_RIGHT);
+ return (0);
+ case 'g': /* Shift display Left */
+ write_command(SHIFT_DISP | SHIFT_LEFT);
+ return (0);
+ }
+
+ return (-1);
+}
+
+static int hd44780_handle_custom_ioctl(unsigned int num, unsigned long arg, unsigned int user_space)
+{
+ unsigned char *buffer = (unsigned char *)arg;
+
+ if (num != HD44780_READ_AC)
+ return (-ENOIOCTLCMD);
+
+ if (user_space)
+ put_user(read_ac(ACCESS_TO_READ), buffer);
+ else
+ buffer[0] = read_ac(ACCESS_TO_READ);
+
+ return (0);
+}
+
+#ifdef USE_PROC
+static int hd44780_proc_status(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+
+ /* Print display configuration */
+ temp += sprintf(temp,
+ "Interface:\t%u bits\n"
+ "Display rows:\t%d\n"
+ "Display cols:\t%d\n"
+ "Screen rows:\t%d\n"
+ "Screen cols:\t%d\n"
+ "Read:\t\t%sabled\n"
+ "Busy flag chk:\t%sabled\n"
+ "Assigned minor:\t%u\n",
+ (test_bit(_4BITS_BUS, &hd44780_flags) ? 4 : 8),
+ par.cntr_rows, par.cntr_cols,
+ par.vs_rows, par.vs_cols,
+ (hd44780.read_char ? "En" : "Dis"),
+ (test_bit(_CHECK_BF, &hd44780_flags) ? "En" : "Dis"),
+ par.minor);
+
+ return (temp-buffer);
+}
+
+static int hd44780_proc_cgram(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+ unsigned int i;
+
+ temp += sprintf(temp, "static void init_charmap(void)\n{\n"
+ "\t/*\n"
+ "\t * charmap[char mapped to cg0] = 0;\n"
+ "\t * charmap[char mapped to cg1] = 1;\n"
+ "\t * charmap[char mapped to cg2] = 2;\n"
+ "\t * charmap[char mapped to cg3] = 3;\n"
+ "\t * charmap[char mapped to cg4] = 4;\n"
+ "\t * charmap[char mapped to cg5] = 5;\n"
+ "\t * charmap[char mapped to cg6] = 6;\n"
+ "\t * charmap[char mapped to cg7] = 7;\n"
+ "\t */\n"
+ "}\n\n");
+
+ for (i = 0; i < 8; ++i) {
+ unsigned char cgram_buffer[8];
+ unsigned int j;
+
+ temp += sprintf(temp, "static unsigned char cg%u[] = { ", i);
+ hd44780_read_cgram_char(i, cgram_buffer);
+ for (j = 0; j < 8; ++j)
+ temp += sprintf(temp, "0x%.2x%s", cgram_buffer[j], (j == 7 ? " };\n" : ", "));
+ }
+
+ return (temp-buffer);
+}
+
+static void create_proc_entries(void)
+{
+ int count = 0;
+
+ SET_PROC_LEVEL(count);
+ if (create_proc_read_entry("status", 0, hd44780.driver_proc_root, hd44780_proc_status, NULL) == NULL) {
+ printk(KERN_ERR "hd44780: cannot create /proc/lcd/%s/status\n", par.name);
+ return;
+ }
+ SET_PROC_LEVEL(++count);
+ if (hd44780.read_cgram_char) {
+ if (create_proc_read_entry("cgram.h", 0, hd44780.driver_proc_root, hd44780_proc_cgram, NULL) == NULL) {
+ printk(KERN_ERR "hd44780: cannot create /proc/lcd/%s/cgram.h\n", par.name);
+ return;
+ }
+ SET_PROC_LEVEL(++count);
+ }
+}
+
+static void remove_proc_entries(void)
+{
+ switch (PROC_LEVEL) {
+ case 2:
+ remove_proc_entry("cgram.h", hd44780.driver_proc_root);
+ case 1:
+ remove_proc_entry("status", hd44780.driver_proc_root);
+ }
+ SET_PROC_LEVEL(0);
+}
+#endif
+
+/* Initialization */
+static int __init hd44780_init_module(void)
+{
+ int ret;
+
+#ifdef MODULE
+#ifdef NOT_DEF
+ if ((ret = request_module("lcd-linux"))) {
+ if (ret != -ENOSYS) {
+ printk(KERN_ERR "hd44780: failure while loading module lcd-linux\n");
+ return (ret);
+ }
+ printk(KERN_ERR "hd44780: your kernel does not have kmod or kerneld support;\n");
+ printk(KERN_ERR "hd44780: remember to load the lcd-linux module before\n");
+ printk(KERN_ERR "hd44780: loading the hd44780 module\n");
+ }
+#endif
+ if (flags != DFLT_FLAGS) par.flags = flags;
+ if (tabstop != DFLT_TABSTOP) par.tabstop = tabstop;
+ if (cntr_rows != DFLT_CNTR_ROWS) par.cntr_rows = cntr_rows;
+ if (cntr_cols != DFLT_CNTR_COLS) par.cntr_cols = cntr_cols;
+ if (vs_rows != DFLT_VS_ROWS) par.vs_rows = vs_rows;
+ if (vs_cols != DFLT_VS_COLS) par.vs_cols = vs_cols;
+ if (minor != HD44780_MINOR) par.minor = minor;
+#endif
+
+ lcd_driver_setup(&hd44780);
+ if ((ret = lcd_register_driver(&hd44780, &par)))
+ return (ret);
+
+#ifdef USE_PROC
+ if (hd44780.driver_proc_root)
+ create_proc_entries();
+#endif
+
+ printk(KERN_INFO "HD44780 driver (LCD-Linux" HD44780_VERSION ")\n");
+ printk(KERN_INFO "Nuccio Raciti <raciti.nuccio@gmail.com>\n");
+
+
+ return (0);
+}
+
+/* Cleanup */
+
+static void __exit hd44780_cleanup_module(void)
+{
+#ifdef USE_PROC
+ if (hd44780.driver_proc_root)
+ remove_proc_entries();
+#endif
+
+ lcd_unregister_driver(&hd44780, &par);
+}
+
+module_init(hd44780_init_module)
+module_exit(hd44780_cleanup_module)
Index: linux-2.6.30.9/drivers/lcd-linux/lcd-linux.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/drivers/lcd-linux/lcd-linux.c 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,2892 @@
+/* lcd-linux.c
+ *
+ *
+ *
+ * Software layer to drive LCD displays under Linux.
+ *
+ * Copyright (C) 2005 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/version.h>
+
+#ifndef KERNEL_VERSION
+#define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
+#endif
+
+#ifndef LINUX_VERSION_CODE
+#error - LINUX_VERSION_CODE undefined in 'linux/version.h'
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+#include <linux/autoconf.h>
+#else
+#include <linux/config.h>
+#endif
+#ifdef CONFIG_PROC_FS
+#define USE_PROC
+#else
+#undef USE_PROC
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
+#include <linux/semaphore.h>
+#else
+#include <asm/semaphore.h>
+#endif
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+
+#include <linux/fs.h>
+
+#include <asm/uaccess.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+#include <linux/device.h>
+#endif
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/selection.h>
+#include <linux/vmalloc.h>
+
+#ifdef USE_PROC
+#include <linux/proc_fs.h>
+#endif
+
+#define LCD_LINUX_MAIN
+#include <linux/lcd-linux.h>
+
+/*** struct_flags ***/
+#define NEED_WRAP 0 /* Next char will trigger a newline */
+#define DECIM 1 /* Insert mode */
+#define DECAWM 2 /* Autowrap */
+#define DECSCNM 3 /* Inverted screen */
+#define CRLF 4 /* Follow lf, vt, ff, with a cr */
+#define INC_CURS_POS 5 /* Increment cursor position after data read/write */
+#define QUES 6 /* CSI Esc sequence contains a question mark */
+#define USER_SPACE 7 /* If set, the buffer pointed by arg in do_lcd_ioctl() is
+ * assumed to be in user space otherwise it is in kernel space */
+#define NULL_CHARMAP 8 /* The driver doesn't provide a charmap so the
+ * lcd-linux layer provides one*/
+#define CAN_DO_COLOR 9 /* The display is color capable */
+#define WITH_ATTR 10 /* If set, the void * buffer in do_lcd_read/write() contains
+ * attributes and therefore is an unsigned short * otherwise it
+ * is an unsigned char *
+ */
+
+/*** attributes ***/
+#define I_MASK 0x03 /* Intensity (0 = low, 1 = normal, 2 = bright) */
+#define ULINE 0x04 /* Underlined text */
+#define REVERSE 0x08 /* Reversed video text */
+#define BLINK 0x80 /* Blinking text */
+
+/*** Color attributes ***/
+#define FG_MASK 0x0f /* Foreground color */
+#define BG_MASK 0xf0 /* Background color */
+
+/* input states */
+#define NORMAL 0x00001000 /* Normal mode */
+#define RAW 0x00002000 /* Raw mode (console emulation disabled) */
+#define SYN 0x00003000 /* Synchronous Idle mode */
+#define ESC 0x00004000 /* Escape mode */
+#define CSI 0x00005000 /* CSI escape mode */
+#define ESC_G0 0x00006000 /* G0 character set */
+#define ESC_G1 0x00007000 /* G1 character set */
+#define ESC_HASH 0x00008000 /* ESC # escape sequence */
+#define ESC_PERCENT 0x00009000 /* ESC % escape sequence */
+#define ARG 0x0000a000 /* Waiting for arguments for the lcd-linux layer */
+#define ARG_DRIVER 0x0000b000 /* Waiting for arguments for the display driver */
+#define INPUT_MASK 0x0000f000
+#define ESC_MASK 0x00ff0000
+#define INIT_MASK 0x0f000000
+#define PROC_MASK 0xf0000000
+
+#define SET_STATE(p, state, mask) ((p)->struct_flags = ((p)->struct_flags & ~(mask)) | ((state) & (mask)))
+#define SET_INPUT_STATE(p, state) SET_STATE(p, state, INPUT_MASK)
+#define SET_ESC_STATE(p, state) SET_STATE(p, (state) << 16, ESC_MASK)
+#define SET_INIT_LEVEL(p, level) SET_STATE(p, (level) << 24, INIT_MASK)
+#define SET_PROC_LEVEL(p, level) SET_STATE(p, (level) << 28, PROC_MASK)
+#define INPUT_STATE(p) ((p)->struct_flags & INPUT_MASK)
+#define ESC_STATE(p) (((p)->struct_flags & ESC_MASK) >> 16)
+#define INIT_LEVEL(p) (((p)->struct_flags & INIT_MASK) >> 24)
+#define PROC_LEVEL(p) (((p)->struct_flags & PROC_MASK) >> 28)
+
+#define NPAR 16 /* Max number of parameters in CSI escape sequence */
+#define FLIP_BUF_SIZE (1 << 6) /* Flip buffer size (64 bytes) */
+
+struct lcd_struct {
+ struct list_head lcd_list; /* Doubly linked list */
+ struct semaphore lcd_sem; /* Locks this structure */
+ struct lcd_driver *driver; /* The driver associated to this struct */
+ struct lcd_parameters *par; /* The parameters associated to this struct */
+ unsigned long struct_flags; /* Flags for internal use only */
+ unsigned int refcount; /* Number of references to this struct */
+
+ unsigned short *display; /* The display buffer */
+
+ unsigned short *fb; /* The virtual screen framebuffer */
+ unsigned int fb_size; /* Size of the framebuffer */
+ unsigned int frame_base; /* Offset of row 0, column 0 of a frame in fb */
+ unsigned int frame_size; /* Size of the frame */
+
+ unsigned int row; /* Current row in virtual screen */
+ unsigned int col; /* Current column in virtual screen */
+ unsigned int s_offset; /* Saved cursor position in virtual screen */
+
+ unsigned int top; /* Top scroll row in virtual screen */
+ unsigned int bot; /* Bottom scroll row in virtual screen */
+
+ int esc_args; /* Number of arguments for a normal escape sequence */
+ unsigned int csi_args[NPAR]; /* CSI parameters */
+ unsigned int index; /* Index in csi_args and counter for cgram characters generation */
+ unsigned char cgram_index; /* Index of the cgram character to be created */
+ unsigned char *cgram_buffer; /* Buffer for cgram operations in this driver */
+
+ unsigned short erase_char; /* Character to be used when erasing */
+ unsigned char attr; /* Current attributes */
+ unsigned char color; /* Color for normal intensity mode */
+ unsigned char s_color; /* Saved color for normal intensity mode */
+ unsigned char defcolor; /* Default color for normal intensity mode */
+ unsigned char ulcolor; /* Color for underline mode */
+ unsigned char halfcolor; /* Color for low intensity mode */
+ unsigned char attributes; /* Packed attributes */
+ unsigned char s_attributes; /* Saved packed attributes */
+
+ unsigned char *s_charmap; /* Saved character map for this driver */
+ unsigned char *flip_buf; /* High speed flip buffer */
+};
+
+/** Function prototypes **/
+
+/* Init/Cleanup the driver */
+static int init_driver(struct lcd_struct *);
+static int cleanup_driver(struct lcd_struct *);
+
+/* Read from/Write to the driver */
+static void read_data(struct lcd_struct *, unsigned short *);
+static void read_cgram(struct lcd_struct *, unsigned char, unsigned char *);
+static void write_data(struct lcd_struct *, unsigned short);
+static void write_cgram(struct lcd_struct *, unsigned char, unsigned char *);
+
+/* Input handlers */
+static void cr(struct lcd_struct *);
+static void lf(struct lcd_struct *);
+static void control_char(struct lcd_struct *, unsigned char);
+static void handle_csi(struct lcd_struct *, unsigned char);
+static int handle_custom_esc(struct lcd_struct *, unsigned int);
+static int handle_esc(struct lcd_struct *, unsigned char);
+static void handle_input(struct lcd_struct *, unsigned short);
+
+/* Low level file operations */
+static ssize_t do_lcd_read(struct lcd_struct *, void *, size_t);
+static ssize_t do_lcd_write(struct lcd_struct *, const void *, size_t);
+static int do_lcd_open(struct lcd_struct *);
+static int do_lcd_release(struct lcd_struct *);
+static int do_lcd_ioctl(struct lcd_struct *, unsigned int, unsigned long);
+
+/* Proc functions */
+#ifdef USE_PROC
+static void create_driver_proc_entries(struct lcd_struct *);
+static void remove_driver_proc_entries(struct lcd_struct *);
+#endif
+
+/* globals */
+static unsigned int major = LCD_MAJOR; /* Major number for LCD-Linux device */
+static unsigned short minors = LCD_MINORS; /* Minor numbers allocated for LCD-Linux */
+static LIST_HEAD(lcd_drivers); /* Registered lcd drivers */
+static struct semaphore drivers_sem; /* Locks the lcd_drivers list */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+static struct class *lcd_linux_class;
+#endif
+#ifdef USE_PROC
+static struct proc_dir_entry *lcd_proc_root;
+#endif
+/* End of globals */
+
+#ifdef MODULE
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+#include <linux/device.h>
+MODULE_ALIAS_CHARDEV_MAJOR(LCD_MAJOR);
+#endif
+MODULE_DESCRIPTION("Software layer to drive LCD displays under Linux.");
+MODULE_AUTHOR("Mattia Jona-Lasinio <mjona@users.sourceforge.net>");
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+module_param(minors, ushort, 0444);
+#else
+MODULE_PARM(minors, "h");
+#endif
+MODULE_PARM_DESC(minors, "Minor numbers allocated for LCD-Linux (default: " string(LCD_MINORS) ")");
+#else
+
+/*
+ * Parse boot command line
+ *
+ * lcd=minors
+ */
+static int __init lcd_linux_boot_init(char *cmdline)
+{
+ unsigned short args;
+
+ if ((args = simple_strtoul(cmdline, NULL, 0)))
+ minors = args;
+
+ return (1);
+}
+
+__setup("lcd=", lcd_linux_boot_init);
+#endif /* MODULE */
+
+/* Macros for iterator handling */
+static inline unsigned int iterator_inc_(unsigned int iterator, const unsigned int module)
+{
+ return ((++iterator)%module);
+}
+
+static inline unsigned int iterator_dec_(unsigned int iterator, const unsigned int module)
+{
+ return (iterator ? --iterator : module-1);
+}
+
+#define iterator_inc(iterator, module) (iterator = iterator_inc_(iterator, module))
+#define iterator_dec(iterator, module) (iterator = iterator_dec_(iterator, module))
+
+/* Uncomment the following two lines
+ * for non-atomic set_bit and clear_bit
+#define set_bit __set_bit
+#define clear_bit __clear_bit
+*/
+
+/************************************
+ * Low level routines and utilities *
+ ************************************/
+/*
+ * Set whether the address counter should be incremented
+ * or decremented after a Read/Write
+ */
+static void address_mode(struct lcd_struct *p, int mode)
+{
+ struct lcd_driver *driver = p->driver;
+
+ if (mode > 0 && ! test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (driver->address_mode)
+ driver->address_mode(mode);
+ set_bit(INC_CURS_POS, &p->struct_flags);
+ } else if (mode < 0 && test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (driver->address_mode)
+ driver->address_mode(mode);
+ clear_bit(INC_CURS_POS, &p->struct_flags);
+ }
+}
+
+/* WARNING!! This function returns an int because if iterator is not
+ * within the visible area of the frame it returns -1
+ */
+static inline int vs_to_frame_(struct lcd_struct *p, unsigned int iterator)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int row = iterator/vs_cols;
+ unsigned int col = iterator%vs_cols;
+ unsigned int frame_base_row = p->frame_base/vs_cols;
+ unsigned int frame_base_col = p->frame_base%vs_cols;
+ unsigned int frame_rows = p->par->cntr_rows*p->par->num_cntr;
+ unsigned int frame_cols = p->par->cntr_cols;
+
+ if (row < frame_base_row || row >= frame_base_row+frame_rows)
+ return (-1);
+ if (col < frame_base_col || col >= frame_base_col+frame_cols)
+ return (-1);
+
+ return ((row-frame_base_row)*frame_cols+(col-frame_base_col));
+}
+
+/* Given 'iterator' in vs, returns the offset in vs corresponding to the nearest
+ * visible offset in vs, or returns 'iterator' if it is already visible.
+ */
+static unsigned int round_vs_(struct lcd_struct *p, unsigned int iterator)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int row = iterator/vs_cols;
+ unsigned int col = iterator%vs_cols;
+ unsigned int frame_base_row = p->frame_base/vs_cols;
+ unsigned int frame_base_col = p->frame_base%vs_cols;
+ unsigned int frame_rows = p->par->cntr_rows*p->par->num_cntr;
+ unsigned int frame_cols = p->par->cntr_cols;
+
+ if (row < frame_base_row)
+ row = frame_base_row;
+ else if (row >= frame_base_row+frame_rows)
+ row = frame_base_row+(frame_rows-1);
+
+ if (col < frame_base_col)
+ col = frame_base_col;
+ else if (col >= frame_base_col+frame_cols)
+ col = frame_base_col+(frame_cols-1);
+
+ return ((row*vs_cols)+col);
+}
+
+#define round_vs(p, iterator) (iterator = round_vs_(p, iterator))
+
+/*
+ * Sync the frame area starting at offset s, ending at offset e with fb content.
+ */
+static void redraw_screen(struct lcd_struct *p, unsigned int s, unsigned int e)
+{
+ unsigned int len;
+ unsigned int row = p->row, col = p->col;
+ unsigned int inc_set = test_bit(INC_CURS_POS, &p->struct_flags);
+ unsigned int frame_cols = p->par->cntr_cols;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned long flags;
+
+ if (s >= p->fb_size || e >= p->fb_size || e < s || e < p->frame_base)
+ return;
+
+ round_vs(p, s);
+ round_vs(p, e);
+
+ len = 1+e-s;
+
+ if (! inc_set)
+ s = e;
+
+ p->row = s/vs_cols;
+ p->col = s%vs_cols;
+
+ flags = p->struct_flags;
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ clear_bit(DECIM, &p->struct_flags);
+ set_bit(DECAWM, &p->struct_flags);
+ SET_INPUT_STATE(p, RAW);
+ if (inc_set)
+ while (len--)
+ if (vs_to_frame_(p, (p->row*vs_cols)+p->col) < 0) {
+ s += vs_cols-frame_cols;
+ len -= vs_cols-frame_cols-1;
+ p->row = s/vs_cols;
+ p->col = s%vs_cols;
+ } else {
+ write_data(p, p->fb[s++]);
+ if (test_bit(NEED_WRAP, &p->struct_flags)) {
+ cr(p);
+ lf(p);
+ }
+ }
+ else
+ while (len--)
+ if (vs_to_frame_(p, (p->row*vs_cols)+p->col) < 0) {
+ s -= vs_cols-frame_cols;
+ len -= vs_cols-frame_cols-1;
+ p->row = s/vs_cols;
+ p->col = s%vs_cols;
+ } else {
+ write_data(p, p->fb[s--]);
+ if (test_bit(NEED_WRAP, &p->struct_flags)) {
+ cr(p);
+ lf(p);
+ }
+ }
+ p->struct_flags = flags;
+
+ p->row = row; p->col = col;
+}
+
+static int make_cursor_visible(struct lcd_struct *p)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int frame_base, frame_base_row, frame_base_col;
+ unsigned int frame_rows = p->par->cntr_rows*p->par->num_cntr;
+ unsigned int frame_cols = p->par->cntr_cols;
+ unsigned int tmp = frame_cols/2;
+
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ /* cursor always on the lowest row of the display */
+ frame_base_row = 0;
+ frame_base_col = 0;
+ if (p->row >= frame_rows)
+ frame_base_row = p->row-(frame_rows-1);
+ if (p->col >= frame_cols) {
+ frame_base_col = p->col-(frame_cols-1);
+ if (tmp) {
+ tmp = (tmp-(frame_base_col%tmp))%tmp;
+ if (frame_base_col+tmp <= vs_cols-frame_cols)
+ frame_base_col += tmp;
+ }
+ }
+ } else {
+ /* cursor always on the uppermost row of the display */
+ frame_base_row = vs_rows-frame_rows;
+ frame_base_col = vs_cols-frame_cols;
+ if (p->row < vs_rows-frame_rows)
+ frame_base_row = p->row;
+ if (p->col < vs_cols-frame_cols) {
+ frame_base_col = p->col;
+ if (tmp) {
+ tmp = frame_base_col%tmp;
+ if (frame_base_col >= tmp)
+ frame_base_col -= tmp;
+ }
+ }
+ }
+
+ frame_base = p->frame_base;
+ p->frame_base = (frame_base_row*vs_cols)+frame_base_col;
+
+ return (frame_base != p->frame_base);
+}
+
+/*
+ * Move the visible screen area at user's wish
+ */
+static void browse_screen(struct lcd_struct *p, unsigned char dir)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int frame_base_row = p->frame_base/vs_cols;
+ unsigned int frame_base_col = p->frame_base%vs_cols;
+ unsigned int frame_rows = p->par->cntr_rows*p->par->num_cntr;
+ unsigned int frame_cols = p->par->cntr_cols;
+
+ switch (dir) {
+ case '1': /* Up */
+ if (! frame_base_row)
+ return;
+ --frame_base_row;
+ break;
+ case '2': /* Down */
+ if (frame_base_row >= vs_rows-frame_rows)
+ return;
+ ++frame_base_row;
+ break;
+ case '3': /* Left */
+ if (! frame_base_col)
+ return;
+ --frame_base_col;
+ break;
+ case '4': /* Right */
+ if (frame_base_col >= vs_cols-frame_cols)
+ return;
+ ++frame_base_col;
+ break;
+ default:
+ return;
+ }
+
+ p->frame_base = (frame_base_row*vs_cols)+frame_base_col;
+ redraw_screen(p, 0, p->fb_size-1);
+}
+
+static inline void __memset_short(unsigned short *buf, unsigned short c, unsigned int len)
+{
+ while (len--)
+ *buf++ = c;
+}
+
+/*
+ * A memset implementation writing to LCD instead of memory locations.
+ */
+static void lcd_memset(struct lcd_struct *p, unsigned int d, unsigned short c, unsigned int len)
+{
+ unsigned int inc_set = test_bit(INC_CURS_POS, &p->struct_flags);
+
+ if (! len || d >= p->fb_size)
+ return;
+
+ if (inc_set && d+len > p->fb_size)
+ len = p->fb_size-d;
+ else if (! inc_set && len > d+1)
+ len = d+1;
+
+ if (! inc_set)
+ d -= len-1;
+ __memset_short(p->fb+d, c, len);
+
+ if (make_cursor_visible(p))
+ redraw_screen(p, 0, p->fb_size-1);
+ else
+ redraw_screen(p, d, d+(len-1));
+}
+
+static inline void __memcpy_short(unsigned short *d, unsigned short *s, unsigned int len, int dir)
+{
+ if (dir > 0)
+ while (len--)
+ *d++ = *s++;
+ else
+ while (len--)
+ *d-- = *s--;
+}
+
+/*
+ * A memmove implementation writing to LCD instead of memory locations.
+ * Copy is done in a non destructive way. Display regions may overlap.
+ */
+static void lcd_memmove(struct lcd_struct *p, unsigned int d, unsigned int s, unsigned int len)
+{
+ if (! len || d == s || d >= p->fb_size || s >= p->fb_size)
+ return;
+
+ if (d < s) {
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (s+len > p->fb_size)
+ len = p->fb_size-s;
+ } else {
+ if (len > d+1)
+ len = d+1;
+ d -= len-1;
+ s -= len-1;
+ }
+ __memcpy_short(p->fb+d, p->fb+s, len, 1);
+ if (make_cursor_visible(p))
+ redraw_screen(p, 0, p->fb_size-1);
+ else
+ redraw_screen(p, d, d+(len-1));
+ } else {
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (d+len > p->fb_size)
+ len = p->fb_size-d;
+ d += len-1;
+ s += len-1;
+ } else {
+ if (len > s+1)
+ len = s+1;
+ }
+ __memcpy_short(p->fb+d, p->fb+s, len, -1);
+ if (make_cursor_visible(p))
+ redraw_screen(p, 0, p->fb_size-1);
+ else
+ redraw_screen(p, d-(len-1), d);
+ }
+}
+
+static void scrup(struct lcd_struct *p, unsigned int t, unsigned int b, unsigned int nr)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int d, s;
+
+ if (t+nr >= b)
+ nr = b-t-1;
+ if (b > vs_rows || t >= b || nr < 1)
+ return;
+ d = t*vs_cols;
+ s = (t+nr)*vs_cols;
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ lcd_memmove(p, d, s, (b-t-nr)*vs_cols);
+ lcd_memset(p, d+(b-t-nr)*vs_cols, p->erase_char, nr*vs_cols);
+ } else {
+ lcd_memmove(p, d+(b-t-nr)*vs_cols-1, s+(b-t-nr)*vs_cols-1, (b-t-nr)*vs_cols);
+ lcd_memset(p, d+(b-t)*vs_cols-1, p->erase_char, nr*vs_cols);
+ }
+}
+
+static void scrdown(struct lcd_struct *p, unsigned int t, unsigned int b, unsigned int nr)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int d, s;
+
+ if (t+nr >= b)
+ nr = b-t-1;
+ if (b > vs_rows || t >= b || nr < 1)
+ return;
+ s = t*vs_cols;
+ d = (t+nr)*vs_cols;
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ lcd_memmove(p, d, s, (b-t-nr)*vs_cols);
+ lcd_memset(p, s, p->erase_char, nr*vs_cols);
+ } else {
+ lcd_memmove(p, d+(b-t-nr)*vs_cols-1, s+(b-t-nr)*vs_cols-1, (b-t-nr)*vs_cols);
+ lcd_memset(p, s+nr*vs_cols-1, p->erase_char, nr*vs_cols);
+ }
+}
+
+static void lcd_insert_char(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int pos = (p->row*vs_cols)+p->col;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (test_bit(INC_CURS_POS, &p->struct_flags))
+ lcd_memmove(p, pos+nr, pos, vs_cols-p->col-nr);
+ else
+ lcd_memmove(p, pos-nr, pos, p->col-(nr-1));
+ lcd_memset(p, pos, p->erase_char, nr);
+}
+
+static void lcd_delete_char(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int pos = (p->row*vs_cols)+p->col;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ lcd_memmove(p, pos, pos+nr, vs_cols-(p->col+nr));
+ lcd_memset(p, (p->row+1)*vs_cols-nr, p->erase_char, nr);
+ } else {
+ lcd_memmove(p, pos, pos-nr, p->col-(nr-1));
+ lcd_memset(p, (p->row*vs_cols)+(nr-1), p->erase_char, nr);
+ }
+}
+
+
+
+
+
+/******************************************************************************
+ ************************* VT 102 Emulation *************************
+ ******************************************************************************/
+
+/**********************
+ * Control characters *
+ **********************/
+static void bs(struct lcd_struct *p)
+{
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (p->col)
+ --p->col;
+ } else {
+ if (p->col+1 < p->par->vs_cols)
+ ++p->col;
+ }
+}
+
+static void cr(struct lcd_struct *p)
+{
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ p->col = (test_bit(INC_CURS_POS, &p->struct_flags) ? 0 : p->par->vs_cols-1);
+}
+
+static void lf(struct lcd_struct *p)
+{
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (p->row+1 == p->bot && INPUT_STATE(p) != RAW) {
+ make_cursor_visible(p);
+ scrup(p, p->top, p->bot, 1);
+ } else if (p->row+1 < p->par->vs_rows)
+ ++p->row;
+ } else {
+ if (p->row == p->top && INPUT_STATE(p) != RAW) {
+ make_cursor_visible(p);
+ scrdown(p, p->top, p->bot, 1);
+ } else if (p->row)
+ --p->row;
+ }
+}
+
+static void ri(struct lcd_struct *p)
+{
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (p->row == p->top) {
+ make_cursor_visible(p);
+ scrdown(p, p->top, p->bot, 1);
+ } else if (p->row)
+ --p->row;
+ } else {
+ if (p->row+1 == p->bot) {
+ make_cursor_visible(p);
+ scrup(p, p->top, p->bot, 1);
+ } else if (p->row+1 < p->par->vs_rows)
+ ++p->row;
+ }
+}
+
+static void ff(struct lcd_struct *p)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (p->driver->clear_display) {
+ p->driver->clear_display();
+ __memset_short(p->fb, p->erase_char, p->fb_size);
+ __memset_short(p->display, p->erase_char, p->frame_size);
+ p->frame_base = 0;
+ } else if (test_bit(INC_CURS_POS, &p->struct_flags))
+ lcd_memset(p, 0, p->erase_char, p->fb_size);
+ else
+ lcd_memset(p, p->fb_size-1, p->erase_char, p->fb_size);
+
+ if (test_bit(INC_CURS_POS, &p->struct_flags))
+ p->row = p->col = 0;
+ else {
+ p->row = vs_rows-1;
+ p->col = vs_cols-1;
+ }
+}
+
+static void tab(struct lcd_struct *p)
+{
+ struct lcd_parameters *par = p->par;
+ unsigned int i, vs_cols = par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+
+ if (! par->tabstop)
+ return;
+
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ i = par->tabstop-(p->col%par->tabstop);
+ if (p->col+i < vs_cols)
+ p->col += i;
+ } else {
+ i = p->col%par->tabstop;
+ i = (i == 0 ? par->tabstop : i);
+ if (p->col >= i)
+ p->col -= i;
+ }
+}
+
+/*
+ * Control character handler.
+ */
+static void control_char(struct lcd_struct *p, unsigned char val)
+{
+ switch (val) {
+ case 0x08: /* BS: Back Space (^H) */
+ case 0x7f: /* DEL: Delete */
+ bs(p);
+ return;
+
+ case 0x09: /* HT: Horizontal Tab (^I) */
+ tab(p);
+ return;
+
+ case 0x0c: /* FF: Form Feed (^L) */
+ ff(p);
+ return;
+
+ case 0x0a: /* LF: Line Feed (^J) */
+ case 0x0b: /* VT: Vertical Tab (^K) */
+ lf(p);
+ if (! test_bit(CRLF, &p->struct_flags))
+ return;
+
+ case 0x0d: /* CR: Carriage Return (^M) */
+ cr(p);
+ return;
+
+ case 0x16: /* SYN: Synchronous Idle (^V) */
+ SET_INPUT_STATE(p, SYN);
+ return;
+
+ case 0x1b: /* ESC: Start of escape sequence */
+ SET_INPUT_STATE(p, ESC);
+ return;
+
+ case 0x9b: /* CSI: Start of CSI escape sequence */
+ memset(p->csi_args, 0, sizeof(p->csi_args));
+ p->index = 0;
+ SET_INPUT_STATE(p, CSI);
+ return;
+ }
+}
+
+static void gotoxy(struct lcd_struct *p, int new_col, int new_row)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (new_row < 0)
+ p->row = 0;
+ else if (new_row >= vs_rows)
+ p->row = vs_rows-1;
+ else
+ p->row = new_row;
+
+ if (new_col < 0)
+ p->col = 0;
+ else if (new_col >= vs_cols)
+ p->col = vs_cols-1;
+ else
+ p->col = new_col;
+
+ if (make_cursor_visible(p))
+ redraw_screen(p, 0, p->fb_size-1);
+}
+
+
+/******************************
+ * ECMA-48 CSI ESC- sequences *
+ ******************************/
+static void csi_at(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+
+ if (p->col+nr > vs_cols)
+ nr = vs_cols-p->col;
+ else if (! nr)
+ ++nr;
+ lcd_insert_char(p, nr);
+}
+
+static void csi_J(struct lcd_struct *p, unsigned int action)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int pos = (p->row*vs_cols)+p->col;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ switch (action) {
+ case 0: /* From cursor to end of display */
+ lcd_memset(p, pos, p->erase_char, p->fb_size-pos);
+ return;
+
+ case 1: /* From start of display to cursor */
+ lcd_memset(p, 0, p->erase_char, pos+1);
+ return;
+
+ case 2: /* Whole display */
+ lcd_memset(p, 0, p->erase_char, p->fb_size);
+ return;
+ }
+}
+
+static void csi_K(struct lcd_struct *p, unsigned int action)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int row_start = p->row*vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ switch (action) {
+ case 0: /* From cursor to end of line */
+ lcd_memset(p, row_start+p->col, p->erase_char, vs_cols-p->col);
+ return;
+
+ case 1: /* From start of line to cursor */
+ lcd_memset(p, row_start, p->erase_char, p->col+1);
+ return;
+
+ case 2: /* Whole line */
+ lcd_memset(p, row_start, p->erase_char, vs_cols);
+ return;
+ }
+}
+
+static void csi_L(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (p->row+nr > vs_rows)
+ nr = vs_rows-p->row;
+ else if (! nr)
+ ++nr;;
+ lcd_memmove(p, (p->row+nr)*vs_cols, p->row*vs_cols, (vs_rows-p->row-nr)*vs_cols);
+ lcd_memset(p, p->row*vs_cols, p->erase_char, nr*vs_cols);
+}
+
+static void csi_M(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (p->row+nr > vs_rows)
+ nr = vs_rows-p->row;
+ else if (! nr)
+ ++nr;;
+ lcd_memmove(p, p->row*vs_cols, (p->row+nr)*vs_cols, (vs_rows-p->row-nr)*vs_cols);
+ lcd_memset(p, (vs_rows-nr)*vs_cols, p->erase_char, nr*vs_cols);
+}
+
+static void csi_P(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+
+ if (p->col+nr > vs_cols)
+ nr = vs_cols-p->col;
+ else if (! nr)
+ ++nr;
+ lcd_delete_char(p, nr);
+}
+
+static void csi_X(struct lcd_struct *p, unsigned int nr)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (p->col+nr > vs_cols)
+ nr = vs_cols-p->col;
+ else if (! nr)
+ ++nr;
+ lcd_memset(p, (p->row*vs_cols)+p->col, p->erase_char, nr);
+}
+
+static void csi_su(struct lcd_struct *p, unsigned char input)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ if (input == 'u') {
+ p->row = p->s_offset/vs_cols;
+ p->col = p->s_offset%vs_cols;
+ p->color = p->s_color;
+ p->attributes = p->s_attributes;
+ return;
+ }
+ p->s_offset = (p->row*vs_cols)+p->col;
+ p->s_color = p->color;
+ p->s_attributes = p->attributes;
+}
+
+static unsigned char build_attr(struct lcd_struct *p, unsigned char color, unsigned char intensity,
+ unsigned char blink, unsigned char underline, unsigned char reverse)
+{
+ unsigned char attr;
+
+ if (test_bit(CAN_DO_COLOR, &p->struct_flags)) {
+ attr = color;
+ if (underline)
+ attr = (attr & BG_MASK) | p->ulcolor;
+ else if (intensity == 0)
+ attr = (attr & BG_MASK) | p->halfcolor;
+ if (reverse)
+ attr = (attr & 0x88) | ((attr & 0x70) >> 4) | ((attr & 0x07) << 4);
+ if (blink)
+ attr ^= 0x80;
+ if (intensity == 2)
+ attr ^= 0x08;
+ } else {
+ attr = intensity;
+ attr |= (underline ? ULINE : 0x00);
+ attr |= (reverse ? REVERSE : 0x00);
+ attr |= (blink ? BLINK : 0x00);
+ }
+
+ return (attr);
+}
+
+static void update_attr(struct lcd_struct *p)
+{
+ unsigned char intensity = p->attributes & 0x03;
+ unsigned char underline = (p->attributes >> 2) & 0x01;
+ unsigned char reverse = (p->attributes >> 3) & 0x01;
+ unsigned char blink = (p->attributes >> 7) & 0x01;
+ unsigned char decscnm = (p->struct_flags >> DECSCNM) & 0x01;
+
+ p->attr = build_attr(p, p->color, intensity, blink, underline, reverse^decscnm);
+ p->erase_char = (build_attr(p, p->color, 1, blink, 0, decscnm) << 8) | ' ';
+}
+
+static void default_attr(struct lcd_struct *p)
+{
+ p->attributes = 0x01;
+ p->color = p->defcolor;
+}
+
+static void lcd_invert_screen(struct lcd_struct *p, unsigned int offset, unsigned int len)
+{
+ if (test_bit(CAN_DO_COLOR, &p->struct_flags))
+ while (len--) {
+ p->fb[offset] = (p->fb[offset] & 0x88ff) | ((p->fb[offset] & 0x7000) >> 4) | ((p->fb[offset] & 0x0700) << 4);
+ ++offset;
+ }
+ else
+ while (len--) {
+ p->fb[offset] ^= 0x0800;
+ ++offset;
+ }
+}
+
+static void csi_m(struct lcd_struct *p, unsigned int n)
+{
+ int i, arg;
+
+ for (i = 0; i <= n; ++i)
+ switch ((arg = p->csi_args[i]))
+ {
+ case 0:
+ default_attr(p);
+ break;
+
+ case 1:
+ p->attributes = (p->attributes & ~I_MASK) | 2;
+ break;
+
+ case 2:
+ p->attributes = (p->attributes & ~I_MASK) | 0;
+ break;
+
+ case 4:
+ p->attributes |= ULINE;
+ break;
+
+ case 5:
+ p->attributes |= BLINK;
+ break;
+
+ case 7:
+ p->attributes |= REVERSE;
+ break;
+
+ case 21: case 22:
+ p->attributes = (p->attributes & ~I_MASK) | 1;
+ break;
+
+ case 24:
+ p->attributes &= ~ULINE;
+ break;
+
+ case 25:
+ p->attributes &= ~BLINK;
+ break;
+
+ case 27:
+ p->attributes &= ~REVERSE;
+ break;
+
+ case 38:
+ p->attributes |= ULINE;
+ p->color = (p->color & BG_MASK) | (p->defcolor & FG_MASK);
+ break;
+
+ case 39:
+ p->attributes &= ~ULINE;
+ p->color = (p->color & BG_MASK) | (p->defcolor & FG_MASK);
+ break;
+
+ case 49:
+ p->color = (p->defcolor & BG_MASK) | (p->color & FG_MASK);
+ break;
+
+ default:
+ if (arg >= 30 && arg <= 37)
+ p->color = (p->color & BG_MASK) | color_table[arg-30];
+ else if (arg >= 40 && arg <= 47)
+ p->color = (p->color & FG_MASK) | (color_table[arg-40] << 4);
+ break;
+ }
+
+ update_attr(p);
+}
+
+static void csi_h(struct lcd_struct *p, unsigned char n)
+{
+ switch (n) {
+ case 4: /* Set insert mode */
+ set_bit(DECIM, &p->struct_flags);
+ return;
+
+ case 5: /* Inverted screen mode */
+ if (test_bit(QUES, &p->struct_flags) && ! test_bit(DECSCNM, &p->struct_flags)) {
+ set_bit(DECSCNM, &p->struct_flags);
+ lcd_invert_screen(p, 0, p->fb_size);
+ update_attr(p);
+ redraw_screen(p, 0, p->fb_size-1);
+ }
+ return;
+
+ case 7: /* Set autowrap */
+ if (test_bit(QUES, &p->struct_flags))
+ set_bit(DECAWM, &p->struct_flags);
+ return;
+
+ case 20: /* Set cr lf */
+ set_bit(CRLF, &p->struct_flags);
+ return;
+ }
+}
+
+static void csi_l(struct lcd_struct *p, unsigned char n)
+{
+ switch (n) {
+ case 4: /* Reset insert mode */
+ clear_bit(DECIM, &p->struct_flags);
+ return;
+
+ case 5: /* Normal screen mode */
+ if (test_bit(QUES, &p->struct_flags) && test_bit(DECSCNM, &p->struct_flags)) {
+ clear_bit(DECSCNM, &p->struct_flags);
+ lcd_invert_screen(p, 0, p->fb_size);
+ update_attr(p);
+ redraw_screen(p, 0, p->fb_size-1);
+ }
+ return;
+
+ case 7: /* Reset autowrap */
+ if (test_bit(QUES, &p->struct_flags))
+ clear_bit(DECAWM, &p->struct_flags);
+ return;
+
+ case 20: /* Reset cr lf */
+ clear_bit(CRLF, &p->struct_flags);
+ return;
+ }
+}
+
+static void csi_linux(struct lcd_struct *p)
+{
+ switch (p->csi_args[0]) {
+ case 1:
+ if (test_bit(CAN_DO_COLOR, &p->struct_flags) && p->csi_args[1] < 16) {
+ p->ulcolor = color_table[p->csi_args[1]];
+ if (p->attributes & ULINE)
+ update_attr(p);
+ }
+ return;
+
+ case 2:
+ if (test_bit(CAN_DO_COLOR, &p->struct_flags) && p->csi_args[1] < 16) {
+ p->halfcolor = color_table[p->csi_args[1]];
+ if ((p->attributes & I_MASK) == 0)
+ update_attr(p);
+ }
+ return;
+
+ case 8:
+ p->defcolor = p->color;
+ default_attr(p);
+ update_attr(p);
+ return;
+ }
+}
+
+static void csi_r(struct lcd_struct *p, unsigned int top, unsigned int bot)
+{
+ /* Minimum allowed region is 2 lines */
+ if (top < bot) {
+ p->top = top-1;
+ p->bot = bot;
+ gotoxy(p, 0, 0);
+ }
+}
+
+/*
+ * ECMA-48 CSI ESC- sequence handler.
+ */
+static void handle_csi(struct lcd_struct *p, unsigned char input)
+{
+ if (p->index >= NPAR) {
+ SET_INPUT_STATE(p, NORMAL);
+ printk(KERN_NOTICE "LCD: too many parameters in CSI escape sequence\n");
+ } else if (input == '?') {
+ set_bit(QUES, &p->struct_flags);
+ } else if (input == ';') {
+ ++p->index;
+ } else if (input >= '0' && input <= '9') {
+ p->csi_args[p->index] = (p->csi_args[p->index]*10)+(input-'0');
+ } else {
+ SET_INPUT_STATE(p, NORMAL);
+ if (! test_bit(INC_CURS_POS, &p->struct_flags))
+ return;
+ switch (input) {
+ case 'h': /* DECSET sequences and mode switches */
+ csi_h(p, p->csi_args[0]);
+ clear_bit(QUES, &p->struct_flags);
+ return;
+
+ case 'l': /* DECRST sequences and mode switches */
+ csi_l(p, p->csi_args[0]);
+ clear_bit(QUES, &p->struct_flags);
+ return;
+ }
+ clear_bit(QUES, &p->struct_flags);
+ switch (input) {
+ case '@': /* Insert # Blank character */
+ csi_at(p, p->csi_args[0]);
+ return;
+
+ case 'G': case '`': /* Cursor to indicated column in current row */
+ if (p->csi_args[0])
+ --p->csi_args[0];
+ gotoxy(p, p->csi_args[0], p->row);
+ return;
+
+ case 'A': /* Cursor # rows Up */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, p->col, p->row-p->csi_args[0]);
+ return;
+
+ case 'B': case 'e': /* Cursor # rows Down */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, p->col, p->row+p->csi_args[0]);
+ return;
+
+ case 'C': case 'a': /* Cursor # columns Right */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, p->col+p->csi_args[0], p->row);
+ return;
+
+ case 'D': /* Cursor # columns Left */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, p->col-p->csi_args[0], p->row);
+ return;
+
+ case 'E': /* Cursor # rows Down, column 1 */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, 0, p->row+p->csi_args[0]);
+ return;
+
+ case 'F': /* Cursor # rows Up, column 1 */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ gotoxy(p, 0, p->row-p->csi_args[0]);
+ return;
+
+ case 'd': /* Cursor to indicated row in current column */
+ if (p->csi_args[0])
+ --p->csi_args[0];
+ gotoxy(p, p->col, p->csi_args[0]);
+ return;
+
+ case 'H': case 'f': /* Cursor to indicated row, column (origin 1, 1) */
+ if (p->csi_args[0])
+ --p->csi_args[0];
+ if (p->csi_args[1])
+ --p->csi_args[1];
+ gotoxy(p, p->csi_args[1], p->csi_args[0]);
+ return;
+
+ case 'J': /* Erase display */
+ csi_J(p, p->csi_args[0]);
+ return;
+
+ case 'K': /* Erase line */
+ csi_K(p, p->csi_args[0]);
+ return;
+
+ case 'L': /* Insert # blank lines */
+ csi_L(p, p->csi_args[0]);
+ return;
+
+ case 'M': /* Delete # blank lines */
+ csi_M(p, p->csi_args[0]);
+ return;
+
+ case 'P': /* Delete # characters on the current line */
+ csi_P(p, p->csi_args[0]);
+ return;
+
+ case 'X': /* Erase # characters on the current line */
+ csi_X(p, p->csi_args[0]);
+ return;
+
+ case 'm': /* Set video attributes */
+ csi_m(p, p->index);
+ return;
+
+ case 's': /* Save cursor position */
+ case 'u': /* Restore cursor position */
+ csi_su(p, input);
+ return;
+
+ case ']': /* Linux private ESC [ ] sequence */
+ csi_linux(p);
+ return;
+
+ case 'r': /* Set the scrolling region */
+ if (! p->csi_args[0])
+ ++p->csi_args[0];
+ if (! p->csi_args[1] || p->csi_args[1] > p->par->vs_rows)
+ p->csi_args[1] = p->par->vs_rows;
+ csi_r(p, p->csi_args[0], p->csi_args[1]);
+ return;
+
+ /* Ignored escape sequences */
+ case 'c':
+ case 'g':
+ case 'n':
+ case 'q':
+ return;
+
+ default:
+ printk(KERN_NOTICE "LCD: unrecognized CSI escape sequence: ESC [ %u\n", input);
+ return;
+ }
+ }
+}
+
+/*
+ * Custom ESC- sequence handler.
+ */
+static int handle_custom_esc(struct lcd_struct *p, unsigned int _input)
+{
+ unsigned char input = _input & 0xff;
+ struct lcd_parameters *par = p->par;
+
+ if (_input & (~0xff)) {
+ switch (ESC_STATE(p)) {
+ case 's':
+ if (p->index++) {
+ unsigned char *buf = p->cgram_buffer+(p->cgram_index-par->cgram_char0)*par->cgram_bytes;
+
+ buf[p->index-2] = input;
+ if (p->index == par->cgram_bytes+1)
+ write_cgram(p, p->cgram_index, buf);
+ } else {
+ if (! p->driver->write_cgram_char) {
+ printk(KERN_ERR "LCD: %s: missing function to write to CGRAM\n", p->par->name);
+ return (-1);
+ }
+ if (input >= par->cgram_char0 && input < par->cgram_char0+par->cgram_chars)
+ p->cgram_index = input;
+ else {
+ printk(KERN_NOTICE "LCD: bad CGRAM index\n");
+ return (-1);
+ }
+ }
+ return (0);
+
+ case 'G':
+ if (input >= par->cgram_char0 && input < par->cgram_char0+par->cgram_chars)
+ write_data(p, (p->attr << 8) | p->driver->charmap[input]);
+ else {
+ SET_INPUT_STATE(p, NORMAL);
+ handle_input(p, (p->attr << 8) | input);
+ }
+ return (0);
+
+ case 'r':
+ if (input == '1')
+ address_mode(p, -1);
+ else if (input == '0')
+ address_mode(p, 1);
+ return (0);
+
+ case 'A':
+ scrup(p, p->top, p->bot, input);
+ return (0);
+
+ case 'B':
+ scrdown(p, p->top, p->bot, input);
+ return (0);
+
+ case 'C':
+ browse_screen(p, input);
+ return (0);
+ }
+ }
+
+ /* These are the custom ESC- sequences */
+ switch (input) {
+ case 's': /* CGRAM select */
+ if (p->cgram_buffer) {
+ SET_ESC_STATE(p, input);
+ p->index = 0;
+ return (par->cgram_bytes+1);
+ } else {
+ printk(KERN_NOTICE "LCD: driver %s does not support CGRAM chars\n", par->name);
+ return (0);
+ }
+
+ case 'A': /* Scroll up */
+ case 'B': /* Scroll down */
+ case 'C': /* Browse screen */
+ case 'G': /* Enter cgram mode */
+ case 'r': /* Decrement counter after data read/write */
+ SET_ESC_STATE(p, input);
+ return (1);
+ }
+
+ return (-1);
+}
+
+/*
+ * ESC- but not CSI sequence handler.
+ */
+static int handle_esc(struct lcd_struct *p, unsigned char input)
+{
+ int ret;
+
+ SET_INPUT_STATE(p, NORMAL);
+ switch (input) {
+ case 'c': /* Reset */
+ set_bit(DECAWM, &p->struct_flags);
+ set_bit(INC_CURS_POS, &p->struct_flags);
+ ff(p);
+ return (0);
+
+ case 'D': /* Line Feed */
+ lf(p);
+ return (0);
+
+ case 'E': /* New Line */
+ cr(p);
+ lf(p);
+ return (0);
+
+ case 'M': /* Reverse Line Feed */
+ ri(p);
+ return (0);
+
+ case '7':
+ case '8':
+ csi_su(p, (input == '7' ? 's' : 'u'));
+ return (0);
+
+ /* CSI: Start of CSI escape sequence */
+ case '[':
+ memset(p->csi_args, 0, sizeof(p->csi_args));
+ p->index = 0;
+ SET_INPUT_STATE(p, CSI);
+ return (0);
+
+ /* Ignored escape sequences */
+ case '(':
+ SET_INPUT_STATE(p, ESC_G0);
+ return (1);
+
+ case ')':
+ SET_INPUT_STATE(p, ESC_G1);
+ return (1);
+
+ case '#':
+ SET_INPUT_STATE(p, ESC_HASH);
+ return (1);
+
+ case '%':
+ SET_INPUT_STATE(p, ESC_PERCENT);
+ return (1);
+
+ case 'H':
+ case 'Z':
+ case '>':
+ case '=':
+ case ']':
+ return (0);
+ }
+
+ /* These are the custom ESC- sequences */
+ if ((ret = handle_custom_esc(p, input)) > 0) {
+ SET_INPUT_STATE(p, ARG);
+ return (ret);
+ }
+
+ if (ret < 0 && p->driver->handle_custom_char)
+ if ((ret = p->driver->handle_custom_char(input)) > 0) {
+ SET_INPUT_STATE(p, ARG_DRIVER);
+ return (ret);
+ }
+
+ if (ret < 0)
+ printk(KERN_NOTICE "LCD: unrecognized escape sequence: ESC %u\n", input);
+
+ return (0);
+}
+
+/*
+ * Main input handler.
+ */
+static void handle_input(struct lcd_struct *p, unsigned short _input)
+{
+ unsigned char input = _input & 0xff;
+ struct lcd_driver *driver = p->driver;
+
+ switch (INPUT_STATE(p)) {
+ case NORMAL:
+ if (input < 0x20 || input == 0x9b)
+ control_char(p, input);
+ else
+ write_data(p, (_input & 0xff00) | driver->charmap[input]);
+ return;
+
+ case RAW:
+ write_data(p, (_input & 0xff00) | driver->charmap[input]);
+ return;
+
+ case SYN:
+ write_data(p, _input);
+ SET_INPUT_STATE(p, NORMAL);
+ return;
+
+ case ESC:
+ p->esc_args = handle_esc(p, input);
+ return;
+
+ case ESC_G0:
+ case ESC_G1:
+ case ESC_HASH:
+ case ESC_PERCENT:
+ if (! --p->esc_args)
+ SET_INPUT_STATE(p, NORMAL);
+ return;
+
+ case CSI:
+ handle_csi(p, input);
+ return;
+
+ case ARG:
+ if (handle_custom_esc(p, 0x100 | input) || ! --p->esc_args)
+ SET_INPUT_STATE(p, NORMAL);
+ return;
+
+ case ARG_DRIVER:
+ if (driver->handle_custom_char(0x100 | input) || ! --p->esc_args)
+ SET_INPUT_STATE(p, NORMAL);
+ return;
+ }
+}
+
+
+
+
+
+/***************************************
+ * Read from/Write to display routines *
+ ***************************************/
+
+/*
+ * Write character data to the display.
+ */
+static void write_data(struct lcd_struct *p, unsigned short data)
+{
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int pos;
+ int frame_pos;
+
+ if (test_bit(NEED_WRAP, &p->struct_flags)) {
+ cr(p);
+ lf(p);
+ }
+
+ if (test_bit(DECIM, &p->struct_flags))
+ lcd_insert_char(p, 1);
+
+ pos = (p->row*vs_cols)+p->col;
+ if ((frame_pos = vs_to_frame_(p, pos)) < 0) {
+ make_cursor_visible(p);
+ redraw_screen(p, 0, p->fb_size-1);
+ frame_pos = vs_to_frame_(p, pos);
+ }
+
+ if (p->display[frame_pos] != data) {
+ p->driver->write_char(frame_pos, data);
+ p->display[frame_pos] = data;
+ }
+
+ p->fb[pos] = data;
+
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ if (p->col+1 < vs_cols)
+ iterator_inc(p->col, vs_cols);
+ else if (test_bit(DECAWM, &p->struct_flags))
+ set_bit(NEED_WRAP, &p->struct_flags);
+ } else {
+ if (p->col)
+ iterator_dec(p->col, vs_cols);
+ else if (test_bit(DECAWM, &p->struct_flags))
+ set_bit(NEED_WRAP, &p->struct_flags);
+ }
+}
+
+/*
+ * Write an entire CGRAM character to the display.
+ */
+static void write_cgram(struct lcd_struct *p, unsigned char index, unsigned char *pixels)
+{
+ unsigned int inc_set = test_bit(INC_CURS_POS, &p->struct_flags);
+
+ if (! inc_set)
+ address_mode(p, 1);
+
+ p->driver->write_cgram_char(index, pixels);
+
+ if (! inc_set)
+ address_mode(p, -1);
+}
+
+/*
+ * Read character data from the display.
+ */
+static void read_data(struct lcd_struct *p, unsigned short *data)
+{
+ unsigned int vs_rows = p->par->vs_rows;
+ unsigned int vs_cols = p->par->vs_cols;
+ unsigned int pos = (p->row*vs_cols)+p->col;
+ int frame_pos;
+
+ if ((frame_pos = vs_to_frame_(p, pos)) < 0) {
+ make_cursor_visible(p);
+ redraw_screen(p, 0, p->fb_size-1);
+ frame_pos = vs_to_frame_(p, pos);
+ }
+
+ p->driver->read_char(frame_pos, data);
+
+ if (test_bit(INC_CURS_POS, &p->struct_flags)) {
+ iterator_inc(p->col, vs_cols);
+ if (! p->col) {
+ if (p->row+1 < vs_rows)
+ ++p->row;
+ }
+ } else {
+ iterator_dec(p->col, vs_cols);
+ if (p->col+1 == vs_cols) {
+ if (p->row)
+ --p->row;
+ }
+ }
+}
+
+/*
+ * Read an entire CGRAM character from the display.
+ */
+static void read_cgram(struct lcd_struct *p, unsigned char index, unsigned char *pixels)
+{
+ unsigned int inc_set = test_bit(INC_CURS_POS, &p->struct_flags);
+
+ if (! inc_set)
+ address_mode(p, 1);
+
+ p->driver->read_cgram_char(index, pixels);
+
+ if (! inc_set)
+ address_mode(p, -1);
+}
+
+
+
+
+
+/****************************
+ * Proc filesystem routines *
+ ****************************/
+#ifdef USE_PROC
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 0)
+/* create_proc_read_entry is missing in 2.2.x kernels */
+static struct proc_dir_entry *create_proc_read_entry(const char *name, mode_t mode,
+ struct proc_dir_entry *parent, read_proc_t *read_proc, void *data)
+{
+ struct proc_dir_entry *res = create_proc_entry(name, mode, parent);
+
+ if (res) {
+ res->read_proc = read_proc;
+ res->data = data;
+ }
+
+ return (res);
+}
+#endif
+
+static int proc_fb_read(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+ struct lcd_struct *p = (struct lcd_struct *)data;
+ unsigned int vs_cols;
+ static unsigned int nr, need_wrap;
+ static off_t _offset;
+
+ down(&p->lcd_sem);
+ if (! offset)
+ _offset = 0;
+ if ((*eof = (_offset >= p->fb_size))) {
+ up(&p->lcd_sem);
+ return (0);
+ }
+ vs_cols = p->par->vs_cols;
+ if (size && need_wrap) {
+ need_wrap = 0;
+ temp += sprintf(temp, "\n");
+ --size;
+ }
+ if (! nr)
+ nr = vs_cols;
+ *start = (char *)0;
+ while (size && nr) {
+ unsigned char c = (p->fb[_offset] & 0xff);
+
+ temp += sprintf(temp, "%c", (c < 0x20 ? '<27>' : c));
+ --size;
+ --nr;
+ ++*start;
+ ++_offset;
+ }
+ if (! nr) {
+ if (size) {
+ temp += sprintf(temp, "\n");
+ --size;
+ } else
+ need_wrap = 1;
+ }
+ up(&p->lcd_sem);
+
+ return (temp-buffer);
+}
+
+static int proc_display_read(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+ struct lcd_struct *p = (struct lcd_struct *)data;
+ unsigned int i, frame_cols;
+ int frame_pos;
+
+ down(&p->lcd_sem);
+ frame_cols = p->par->cntr_cols;
+ frame_pos = vs_to_frame_(p, (p->row*p->par->vs_cols)+p->col);
+ temp += sprintf(temp, " ");
+ for (i = 2; i <= frame_cols; i += 2)
+ temp += sprintf(temp, " %d", i%10);
+ temp += sprintf(temp, "\n");
+
+ temp += sprintf(temp, " +");
+ for (i = 0; i < frame_cols; ++i)
+ temp += sprintf(temp, "-");
+ temp += sprintf(temp, "+\n");
+
+ for (i = 0; i < p->frame_size; ++i) {
+ unsigned char c = (p->display[i] & 0xff);
+
+ if (! (i%frame_cols))
+ temp += sprintf(temp, "%2d |", 1+i/frame_cols);
+ if (frame_pos--)
+ temp += sprintf(temp, "%c", (c < 0x20 ? '<27>' : c));
+ else
+ temp += sprintf(temp, "_");
+ if (! ((i+1)%frame_cols))
+ temp += sprintf(temp, "|\n");
+ }
+
+ temp += sprintf(temp, " +");
+ for (i = 0; i < frame_cols; ++i)
+ temp += sprintf(temp, "-");
+ temp += sprintf(temp, "+\n");
+ up(&p->lcd_sem);
+
+ return (temp-buffer);
+}
+
+static int proc_charmap_read(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+ struct lcd_struct *p = (struct lcd_struct *)data;
+ unsigned char *charmap;
+ unsigned int i;
+
+ down(&p->lcd_sem);
+ charmap = p->driver->charmap;
+ temp += sprintf(temp, "static unsigned char charmap[] = {");
+ for (i = 0; i < 255; ++i) {
+ if (! (i & 7)) {
+ temp += sprintf(temp, "\n");
+ if (! (i & 31))
+ temp += sprintf(temp, "\n/* %d - %d */\n", i, i+31);
+ }
+ temp += sprintf(temp, "0x%.2x, ", *charmap++);
+ }
+ temp += sprintf(temp, "0x%.2x\n\n};\n", *charmap);
+ up(&p->lcd_sem);
+
+ return (temp-buffer);
+}
+
+static int proc_registered_drivers(char *buffer, char **start, off_t offset, int size, int *eof, void *data)
+{
+ char *temp = buffer;
+ struct list_head *entry;
+
+ down(&drivers_sem);
+ temp += sprintf(temp, "Registered drivers:\n");
+ list_for_each(entry, &lcd_drivers) {
+ struct lcd_struct *p = list_entry(entry, struct lcd_struct, lcd_list);
+
+ down(&p->lcd_sem);
+ temp += sprintf(temp, "%3d %s\n", p->par->minor, p->par->name);
+ up(&p->lcd_sem);
+ }
+ up(&drivers_sem);
+
+ return (temp-buffer);
+}
+
+static void create_driver_proc_entries(struct lcd_struct *p)
+{
+ struct proc_dir_entry *driver_proc_root = p->driver->driver_proc_root;
+ int proc_level = 0;
+
+ SET_PROC_LEVEL(p, proc_level);
+ if (create_proc_read_entry("framebuffer", 0, driver_proc_root, proc_fb_read, p) == NULL) {
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/%s/framebuffer\n", p->par->name);
+ return;
+ }
+ SET_PROC_LEVEL(p, ++proc_level);
+ if (create_proc_read_entry("display", 0, driver_proc_root, proc_display_read, p) == NULL) {
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/%s/display\n", p->par->name);
+ return;
+ }
+ SET_PROC_LEVEL(p, ++proc_level);
+ if (create_proc_read_entry("charmap.h", 0, driver_proc_root, proc_charmap_read, p) == NULL) {
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/%s/charmap.h\n", p->par->name);
+ return;
+ }
+ SET_PROC_LEVEL(p, ++proc_level);
+}
+
+static void remove_driver_proc_entries(struct lcd_struct *p)
+{
+ struct proc_dir_entry *driver_proc_root = p->driver->driver_proc_root;
+
+ switch (PROC_LEVEL(p)) {
+ case 3:
+ remove_proc_entry("charmap.h", driver_proc_root);
+ case 2:
+ remove_proc_entry("display", driver_proc_root);
+ case 1:
+ remove_proc_entry("framebuffer", driver_proc_root);
+ }
+ SET_PROC_LEVEL(p, 0);
+}
+#endif
+
+
+
+
+
+/*****************************
+ * Low level file operations *
+ *****************************/
+static ssize_t do_lcd_read(struct lcd_struct *p, void *buffer, size_t length)
+{
+ unsigned int i;
+ unsigned short tmp;
+
+ if (! p->refcount)
+ return (-ENXIO);
+
+ if (! p->driver->read_char) {
+ printk(KERN_NOTICE "LCD: driver %s doesn't support reading\n", p->par->name);
+ return (-ENOSYS);
+ }
+
+ if (test_bit(WITH_ATTR, &p->struct_flags))
+ for (i = 0; i < length; ++i) {
+ read_data(p, &tmp);
+ ((unsigned short *)buffer)[i] = tmp;
+ }
+ else
+ for (i = 0; i < length; ++i) {
+ read_data(p, &tmp);
+ ((unsigned char *)buffer)[i] = tmp & 0xff;
+ }
+
+ return (length);
+}
+
+static ssize_t do_lcd_write(struct lcd_struct *p, const void *buffer, size_t length)
+{
+ unsigned int i;
+
+ if (! p->refcount)
+ return (-ENXIO);
+
+ if (test_bit(WITH_ATTR, &p->struct_flags))
+ for (i = 0; i < length; ++i)
+ handle_input(p, ((const unsigned short *)buffer)[i]);
+ else
+ for (i = 0; i < length; ++i)
+ handle_input(p, (p->attr << 8) | ((const unsigned char *)buffer)[i]);
+
+ return (length);
+}
+
+static int do_lcd_open(struct lcd_struct *p)
+{
+ if (! p->refcount) {
+ if (p->driver->driver_module) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+ if (! try_module_get(p->driver->driver_module))
+ return (-EBUSY);
+#else
+ if (__MOD_IN_USE(p->driver->driver_module))
+ return (-EBUSY);
+
+ __MOD_INC_USE_COUNT(p->driver->driver_module);
+#endif
+ }
+ }
+
+ ++p->refcount;
+
+ return (0);
+}
+
+static int do_lcd_release(struct lcd_struct *p)
+{
+ if (! p->refcount)
+ return (0);
+
+ if (p->refcount == 1) {
+ if (p->driver->driver_module)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+ module_put(p->driver->driver_module);
+#else
+ __MOD_DEC_USE_COUNT(p->driver->driver_module);
+#endif
+ }
+
+ --p->refcount;
+
+ return (0);
+}
+
+static int cgram_ioctl(struct lcd_struct *p, unsigned int cmd, unsigned char *argp)
+{
+ struct lcd_parameters *par = p->par;
+ unsigned int length = par->cgram_bytes;
+ unsigned char index = argp[0];
+ unsigned char *buffer = argp+1;
+ unsigned char *cgram_buffer = p->cgram_buffer+(index-par->cgram_char0)*length;
+
+ if (index < par->cgram_char0 || index >= par->cgram_char0+par->cgram_chars)
+ return (-EINVAL);
+
+ if (cmd == LCDL_SET_CGRAM_CHAR) {
+ if (! p->driver->write_cgram_char) {
+ printk(KERN_ERR "LCD: %s: missing function to write to CGRAM\n", p->par->name);
+ return (-ENOSYS);
+ }
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_from_user(cgram_buffer, buffer, length))
+ return (-EFAULT);
+ } else
+ memcpy(cgram_buffer, buffer, length);
+ write_cgram(p, index, cgram_buffer);
+ } else {
+ if (! p->driver->read_cgram_char) {
+ printk(KERN_ERR "LCD: %s: missing function to read from CGRAM or unable to read\n", p->par->name);
+ return (-ENOSYS);
+ }
+ read_cgram(p, index, cgram_buffer);
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_to_user(buffer, cgram_buffer, length))
+ return (-EFAULT);
+ } else
+ memcpy(buffer, cgram_buffer, length);
+ }
+
+ return (0);
+}
+
+static int do_lcd_ioctl(struct lcd_struct *p, unsigned int cmd, unsigned long arg)
+{
+ int i;
+ struct lcd_driver *driver = p->driver;
+ struct lcd_parameters *par = p->par;
+ unsigned char *argp = (unsigned char *)arg;
+
+ if (! p->refcount)
+ return (-ENXIO);
+
+ switch (cmd) {
+ case LCDL_SET_PARAM:
+ if ((i = cleanup_driver(p)))
+ return (i);
+ i = par->minor;
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_from_user(par, argp, sizeof(struct lcd_parameters)))
+ return (-EFAULT);
+ } else
+ memcpy(par, argp, sizeof(struct lcd_parameters));
+ par->minor = i;
+ return (init_driver(p));
+
+ case LCDL_GET_PARAM:
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_to_user(argp, par, sizeof(struct lcd_parameters)))
+ return (-EFAULT);
+ } else
+ memcpy(argp, par, sizeof(struct lcd_parameters));
+ return (0);
+
+ case LCDL_RESET_CHARMAP:
+ for (i = 0; i < 256; ++i)
+ driver->charmap[i] = i;
+ return (0);
+
+ case LCDL_CHARSUBST:
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ get_user(i, argp);
+ get_user(driver->charmap[i], argp+1);
+ } else {
+ i = argp[0];
+ driver->charmap[i] = argp[1];
+ }
+ return (0);
+
+ case LCDL_SAVE_CHARMAP:
+ memcpy(p->s_charmap, driver->charmap, 256);
+ return (0);
+
+ case LCDL_RESTORE_CHARMAP:
+ memcpy(driver->charmap, p->s_charmap, 256);
+ return (0);
+
+ case LCDL_SWAP_CHARMAP:
+ {
+ unsigned char *tmp;
+
+ tmp = driver->charmap;
+ driver->charmap = p->s_charmap;
+ p->s_charmap = tmp;
+ }
+ return (0);
+
+ case LCDL_RAW_MODE:
+ if (arg) {
+ clear_bit(NEED_WRAP, &p->struct_flags);
+ clear_bit(DECIM, &p->struct_flags);
+ clear_bit(DECAWM, &p->struct_flags);
+ SET_INPUT_STATE(p, RAW);
+ } else {
+ set_bit(DECAWM, &p->struct_flags);
+ SET_INPUT_STATE(p, NORMAL);
+ }
+ return (0);
+
+ case LCDL_CLEAR_DISP:
+ ff(p);
+ return (0);
+
+ case LCDL_SET_CGRAM_CHAR:
+ case LCDL_GET_CGRAM_CHAR:
+ if (p->cgram_buffer)
+ return (cgram_ioctl(p, cmd, argp));
+ else
+ printk(KERN_NOTICE "LCD: driver %s does not support CGRAM chars\n", par->name);
+ return (0);
+
+ case LCDL_SET_CHARMAP:
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_from_user(driver->charmap, argp, 256))
+ return (-EFAULT);
+ } else
+ memcpy(driver->charmap, argp, 256);
+ return (0);
+
+ case LCDL_GET_CHARMAP:
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_to_user(argp, driver->charmap, 256))
+ return (-EFAULT);
+ } else
+ memcpy(argp, driver->charmap, 256);
+ return (0);
+
+ case LCDL_MEMSET:
+ case LCDL_MEMMOVE:
+ {
+ int buf[3];
+
+ if (test_bit(USER_SPACE, &p->struct_flags)) {
+ if (copy_from_user(buf, argp, sizeof(buf)))
+ return (-EFAULT);
+ } else
+ memcpy(buf, argp, sizeof(buf));
+
+ if (cmd == LCDL_MEMSET)
+ lcd_memset(p, buf[0], buf[1], buf[2]);
+ else
+ lcd_memmove(p, buf[0], buf[1], buf[2]);
+
+ return (0);
+ }
+
+ default:
+ if (driver->handle_custom_ioctl)
+ return (driver->handle_custom_ioctl(cmd, arg, test_bit(USER_SPACE, &p->struct_flags)));
+ }
+
+ return (-ENOIOCTLCMD);
+}
+
+
+
+
+
+/**************************************************
+ * Kernel register/unregister lcd driver routines *
+ **************************************************/
+/*
+ * Find a driver in lcd_drivers linked list
+ */
+static struct lcd_struct *find_lcd_struct(unsigned short minor)
+{
+ struct list_head *entry;
+
+ list_for_each(entry, &lcd_drivers) {
+ struct lcd_struct *p = list_entry(entry, struct lcd_struct, lcd_list);
+
+ if (p->par->minor == minor)
+ return (p);
+ }
+
+ return (NULL);
+}
+
+static void list_add_sorted(struct list_head *new)
+{
+ struct list_head *entry;
+ unsigned short new_minor = (list_entry(new, struct lcd_struct, lcd_list))->par->minor;
+
+ list_for_each(entry, &lcd_drivers) {
+ struct lcd_struct *p = list_entry(entry, struct lcd_struct, lcd_list);
+
+ if (p->par->minor > new_minor)
+ break;
+ }
+ list_add_tail(new, entry);
+}
+
+/* Exported function */
+int lcd_register_driver(struct lcd_driver *driver, struct lcd_parameters *par)
+{
+ int ret;
+ struct lcd_struct *p;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
+ struct device *lcd_device;
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+ struct class_device *lcd_class_device;
+#endif
+
+ if (! driver || ! par || par->minor >= minors)
+ return (-EINVAL);
+ if (! driver->write_char || ! driver->init_port || ! driver->cleanup_port) {
+ printk(KERN_ERR "LCD: missing functions\n");
+ return (-EINVAL);
+ }
+
+ down(&drivers_sem);
+
+ if (find_lcd_struct(par->minor)) {
+ up(&drivers_sem);
+ return (-EBUSY);
+ }
+
+ if ((p = (struct lcd_struct *)kmalloc(sizeof(struct lcd_struct), GFP_KERNEL)) == NULL) {
+ printk(KERN_ERR "LCD: memory allocation failed (kmalloc)\n");
+ up(&drivers_sem);
+ return (-ENOMEM);
+ }
+ memset(p, 0, sizeof(struct lcd_struct));
+
+ p->driver = driver;
+ p->par = par;
+ p->refcount = 0;
+ SET_INIT_LEVEL(p, 0);
+ SET_INPUT_STATE(p, NORMAL);
+ set_bit(DECAWM, &p->struct_flags);
+ set_bit(INC_CURS_POS, &p->struct_flags);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
+ lcd_device = device_create(lcd_linux_class, NULL, MKDEV(major, par->minor), "%s", par->name);
+ if (IS_ERR(lcd_device)) {
+ kfree(p);
+ up(&drivers_sem);
+ return (PTR_ERR(lcd_device));
+ }
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 15)
+ lcd_class_device = class_device_create(lcd_linux_class, NULL, MKDEV(major, par->minor), NULL, "%s", par->name);
+ if (IS_ERR(lcd_class_device)) {
+ kfree(p);
+ up(&drivers_sem);
+ return (PTR_ERR(lcd_class_device));
+ }
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+ lcd_class_device = class_device_create(lcd_linux_class, MKDEV(major, par->minor), NULL, "%s", par->name);
+ if (IS_ERR(lcd_class_device)) {
+ kfree(p);
+ up(&drivers_sem);
+ return (PTR_ERR(lcd_class_device));
+ }
+#endif
+
+#ifdef USE_PROC
+ if (lcd_proc_root && (driver->driver_proc_root = proc_mkdir(par->name, lcd_proc_root)) == NULL)
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/%s/\n", par->name);
+#endif
+
+ if ((ret = init_driver(p))) {
+#ifdef USE_PROC
+ if (driver->driver_proc_root)
+ remove_proc_entry(p->par->name, lcd_proc_root);
+#endif
+ kfree(p);
+ up(&drivers_sem);
+ return (ret);
+ }
+
+ init_MUTEX(&p->lcd_sem);
+
+ list_add_sorted(&p->lcd_list);
+
+ up(&drivers_sem);
+
+#ifdef MODULE
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+ try_module_get(THIS_MODULE);
+#else
+ MOD_INC_USE_COUNT;
+#endif
+#endif
+
+ return (0);
+}
+EXPORT_SYMBOL(lcd_register_driver);
+
+/* Exported function */
+int lcd_unregister_driver(struct lcd_driver *driver, struct lcd_parameters *par)
+{
+ int ret;
+ struct lcd_struct *p;
+
+ if (! driver || ! par || par->minor >= minors)
+ return (-EINVAL);
+
+ down(&drivers_sem);
+
+ if ((p = find_lcd_struct(par->minor)) == NULL || p->driver != driver) {
+ printk(KERN_ERR "LCD: driver not found; lcd_unregister_driver failed\n");
+ up(&drivers_sem);
+ return (-ENODEV);
+ }
+
+ down(&p->lcd_sem);
+
+ if (p->refcount) {
+ printk(KERN_ERR "LCD: driver busy; lcd_unregister_driver failed\n");
+ up(&p->lcd_sem);
+ up(&drivers_sem);
+ return (-EBUSY);
+ }
+
+ if ((ret = cleanup_driver(p))) {
+ up(&p->lcd_sem);
+ up(&drivers_sem);
+ return (ret);
+ }
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
+ device_destroy(lcd_linux_class, MKDEV(major, par->minor));
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+ class_device_destroy(lcd_linux_class, MKDEV(major, par->minor));
+#endif
+
+#ifdef USE_PROC
+ if (p->driver->driver_proc_root)
+ remove_proc_entry(p->par->name, lcd_proc_root);
+#endif
+
+ list_del(&p->lcd_list);
+ kfree(p);
+
+ up(&drivers_sem);
+
+#ifdef MODULE
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
+ module_put(THIS_MODULE);
+#else
+ MOD_DEC_USE_COUNT;
+#endif
+#endif
+
+ return (0);
+}
+EXPORT_SYMBOL(lcd_unregister_driver);
+
+
+
+
+
+/************************
+ * Kernel I/O interface *
+ ************************/
+/* Exported function */
+int lcd_open(unsigned short minor, struct lcd_struct **pp)
+{
+ int ret;
+ struct lcd_struct *p;
+
+ down(&drivers_sem);
+
+ if (minor >= minors || (*pp = p = find_lcd_struct(minor)) == NULL) {
+ printk(KERN_ERR "LCD: lcd_open failed. Device not found.\n");
+ up(&drivers_sem);
+ return (-ENODEV);
+ }
+
+ down(&p->lcd_sem);
+ up(&drivers_sem);
+
+ ret = do_lcd_open(p);
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+EXPORT_SYMBOL(lcd_open);
+
+/* Exported function */
+int lcd_close(struct lcd_struct **pp)
+{
+ int ret;
+ struct lcd_struct *p;
+
+ if (! pp || ! (p = *pp)) {
+ printk(KERN_ERR "LCD: NULL pointer in lcd_close\n");
+ return (-ENODEV);
+ }
+
+ down(&p->lcd_sem);
+
+ if (! (ret = do_lcd_release(p)))
+ *pp = NULL;
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+EXPORT_SYMBOL(lcd_close);
+
+static inline loff_t offset_to_row_col(struct lcd_struct *p, loff_t offset)
+{
+ unsigned long _offset = offset;
+ unsigned int vs_cols = p->par->vs_cols;
+
+ gotoxy(p, _offset%vs_cols, _offset/vs_cols);
+
+ return ((p->row*vs_cols)+p->col);
+}
+
+/* Exported function */
+ssize_t lcd_read(struct lcd_struct *p, void *bufp, size_t length, loff_t offset, unsigned int with_attr)
+{
+ ssize_t ret = 0;
+
+ if (! p) {
+ printk(KERN_ERR "LCD: NULL pointer in lcd_read\n");
+ return (-ENODEV);
+ }
+ if (! bufp)
+ return (-EFAULT);
+ if (offset < 0 || offset >= p->fb_size)
+ return (-EINVAL);
+
+ if (length+offset > p->fb_size)
+ length = p->fb_size-offset;
+
+ if (with_attr)
+ set_bit(WITH_ATTR, &p->struct_flags);
+
+ offset_to_row_col(p, offset);
+ ret = do_lcd_read(p, bufp, length);
+
+ if (with_attr)
+ clear_bit(WITH_ATTR, &p->struct_flags);
+
+ return (ret);
+}
+EXPORT_SYMBOL(lcd_read);
+
+/* Exported function */
+ssize_t lcd_write(struct lcd_struct *p, const void *bufp, size_t length, loff_t offset, unsigned int with_attr)
+{
+ ssize_t ret;
+
+ if (! p) {
+ printk(KERN_ERR "LCD: NULL pointer in lcd_write\n");
+ return (-ENODEV);
+ }
+ if (! bufp)
+ return (-EFAULT);
+ if (offset < 0 || offset >= p->fb_size)
+ return (-EINVAL);
+
+ if (with_attr)
+ set_bit(WITH_ATTR, &p->struct_flags);
+
+ offset_to_row_col(p, offset);
+ ret = do_lcd_write(p, bufp, length);
+
+ if (with_attr)
+ clear_bit(WITH_ATTR, &p->struct_flags);
+
+ return (ret);
+}
+EXPORT_SYMBOL(lcd_write);
+
+/* Exported function */
+int lcd_ioctl(struct lcd_struct *p, unsigned int cmd, ...)
+{
+ int ret;
+ unsigned long arg;
+ va_list ap;
+
+ if (! p) {
+ printk(KERN_ERR "LCD: NULL pointer in lcd_ioctl\n");
+ return (-ENODEV);
+ }
+
+ down(&p->lcd_sem);
+ va_start(ap, cmd);
+ arg = va_arg(ap, unsigned long);
+ ret = do_lcd_ioctl(p, cmd, arg);
+ va_end(ap);
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+EXPORT_SYMBOL(lcd_ioctl);
+
+
+
+
+
+/*******************
+ * File operations *
+ *******************/
+static loff_t lcd_fops_llseek(struct file *filp, loff_t offset, int orig)
+{
+ struct lcd_struct *p;
+
+ if (! (p = filp->private_data))
+ return (-ENODEV);
+
+ down(&p->lcd_sem);
+
+ switch (orig) {
+ case 0:
+ filp->f_pos = offset;
+ break;
+
+ case 1:
+ filp->f_pos += offset;
+ break;
+
+ default:
+ up(&p->lcd_sem);
+ return (-EINVAL); /* SEEK_END not supported */
+ }
+
+ filp->f_pos = offset_to_row_col(p, filp->f_pos);
+
+ up(&p->lcd_sem);
+
+ return (filp->f_pos);
+}
+
+static ssize_t lcd_fops_read(struct file *filp, char *buffer, size_t length, loff_t *offp)
+{
+ ssize_t ret = 0;
+ char *bufp = buffer;
+ struct lcd_struct *p;
+
+ if (! bufp)
+ return (-EFAULT);
+ if (! (p = filp->private_data))
+ return (-ENODEV);
+
+ down(&p->lcd_sem);
+
+ if (*offp < 0 || *offp >= p->fb_size) {
+ up(&p->lcd_sem);
+ return (-EINVAL);
+ }
+
+ if (length+(*offp) > p->fb_size)
+ length = p->fb_size-(*offp);
+
+ while (length) {
+ ret = (length > FLIP_BUF_SIZE ? FLIP_BUF_SIZE : length);
+ if ((ret = do_lcd_read(p, p->flip_buf, ret)) < 0)
+ break;
+ *offp = (p->row*p->par->vs_cols)+p->col;
+ if (copy_to_user(bufp, p->flip_buf, ret)) {
+ ret = -EFAULT;
+ break;
+ }
+ length -= ret;
+ bufp += ret;
+ ret = bufp-buffer;
+ if (length)
+ schedule();
+ }
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+
+static ssize_t lcd_fops_write(struct file *filp, const char *buffer, size_t length, loff_t *offp)
+{
+ ssize_t ret = 0;
+ const char *bufp = buffer;
+ struct lcd_struct *p;
+
+ if (! bufp)
+ return (-EFAULT);
+ if (! (p = filp->private_data))
+ return (-ENODEV);
+
+ down(&p->lcd_sem);
+
+ if (*offp < 0 || *offp >= p->fb_size) {
+ up(&p->lcd_sem);
+ return (-EINVAL);
+ }
+
+ while (length) {
+ ret = (length > FLIP_BUF_SIZE ? FLIP_BUF_SIZE : length);
+ if (copy_from_user(p->flip_buf, bufp, ret)) {
+ ret = -EFAULT;
+ break;
+ }
+ if ((ret = do_lcd_write(p, p->flip_buf, ret)) < 0)
+ break;
+ *offp = (p->row*p->par->vs_cols)+p->col;
+ length -= ret;
+ bufp += ret;
+ ret = bufp-buffer;
+ if (length)
+ schedule();
+ }
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+
+static int lcd_fops_open(struct inode *inop, struct file *filp)
+{
+ unsigned short minor;
+ int ret;
+ struct lcd_struct *p;
+
+ down(&drivers_sem);
+
+ if ((minor = MINOR(inop->i_rdev)) >= minors || (filp->private_data = p = find_lcd_struct(minor)) == NULL) {
+ up(&drivers_sem);
+ return (-ENODEV);
+ }
+
+ down(&p->lcd_sem);
+ up(&drivers_sem);
+
+ ret = do_lcd_open(p);
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+
+static int lcd_fops_release(struct inode *inop, struct file *filp)
+{
+ struct lcd_struct *p;
+ int ret;
+
+ if (! (p = filp->private_data))
+ return (-ENODEV);
+
+ down(&p->lcd_sem);
+
+ if (! (ret = do_lcd_release(p)))
+ filp->private_data = NULL;
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+
+static int lcd_fops_ioctl(struct inode *inop, struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct lcd_struct *p;
+ int ret;
+
+ if (! (p = filp->private_data))
+ return (-ENODEV);
+
+ down(&p->lcd_sem);
+
+ set_bit(USER_SPACE, &p->struct_flags);
+ ret = do_lcd_ioctl(p, cmd, arg);
+ clear_bit(USER_SPACE, &p->struct_flags);
+
+ up(&p->lcd_sem);
+
+ return (ret);
+}
+
+static struct file_operations lcd_linux_fops = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 0)
+ .owner = THIS_MODULE,
+#endif
+ .llseek = lcd_fops_llseek,
+ .read = lcd_fops_read,
+ .write = lcd_fops_write,
+ .open = lcd_fops_open,
+ .release = lcd_fops_release,
+ .ioctl = lcd_fops_ioctl,
+};
+
+
+
+
+
+/********************************
+ * Init/Cleanup driver routines *
+ ********************************/
+static int do_init_driver(struct lcd_struct *p)
+{
+ int ret, init_level;
+ struct lcd_driver *driver = p->driver;
+ struct lcd_parameters *par = p->par;
+ unsigned int frame_rows = par->cntr_rows*par->num_cntr;
+ unsigned int frame_cols = par->cntr_cols;
+
+ switch ((init_level = INIT_LEVEL(p))) {
+ case 0:
+ if (frame_rows == 0 || frame_cols == 0 || ! par->name) {
+ printk(KERN_ERR "LCD: wrong lcd parameters\n");
+ return (-EINVAL);
+ }
+ if (driver->validate_driver) {
+ if ((ret = driver->validate_driver()) < 0) {
+ printk(KERN_ERR "LCD: validate_driver failed\n");
+ return (-EINVAL);
+ } else if (ret > 0) {
+ set_bit(CAN_DO_COLOR, &p->struct_flags);
+ p->defcolor = 0x07;
+ p->ulcolor = 0x0f;
+ p->halfcolor = 0x08;
+ }
+ }
+ default_attr(p);
+ update_attr(p);
+ p->frame_size = frame_rows*frame_cols;
+ if (par->vs_rows < frame_rows)
+ par->vs_rows = frame_rows;
+ if (par->vs_cols < frame_cols)
+ par->vs_cols = frame_cols;
+ p->fb_size = par->vs_rows*par->vs_cols;
+
+ ret = sizeof(short)*p->fb_size;
+ ret += sizeof(short)*p->frame_size;
+ ret += FLIP_BUF_SIZE;
+ ret += (p->driver->charmap ? 256 : 512);
+ ret += par->cgram_chars*par->cgram_bytes;
+ if ((p->fb = (unsigned short *)vmalloc(ret)) == NULL) {
+ printk(KERN_ERR "LCD: memory allocation failed (vmalloc)\n");
+ return (-ENOMEM);
+ }
+ __memset_short(p->fb, p->erase_char, p->fb_size+p->frame_size);
+
+ p->display = p->fb+p->fb_size;
+ p->flip_buf = (unsigned char *)(p->display+p->frame_size);
+
+ if (! p->driver->charmap) {
+ set_bit(NULL_CHARMAP, &p->struct_flags);
+ p->driver->charmap = p->flip_buf+FLIP_BUF_SIZE;
+ for (ret = 0; ret < 256; ++ret)
+ p->driver->charmap[ret] = ret;
+ p->s_charmap = p->driver->charmap+256;
+ } else
+ p->s_charmap = p->flip_buf+FLIP_BUF_SIZE;
+ memset(p->s_charmap, 0, 256);
+
+ if (par->cgram_chars*par->cgram_bytes) {
+ p->cgram_buffer = p->s_charmap+256;
+ memset(p->cgram_buffer, 0, par->cgram_chars*par->cgram_bytes);
+ } else
+ p->cgram_buffer = NULL;
+
+ p->frame_base = 0;
+ p->row = p->col = 0;
+ p->top = 0;
+ p->bot = par->vs_rows;
+ SET_INIT_LEVEL(p, ++init_level);
+
+ case 1:
+ /* Initialize the communication port */
+ if ((ret = driver->init_port())) {
+ printk(KERN_ERR "LCD: failure while initializing the communication port\n");
+ return (ret);
+ }
+ SET_INIT_LEVEL(p, ++init_level);
+
+ case 2:
+ /* Initialize LCD display */
+ if (driver->init_display && (ret = driver->init_display())) {
+ printk(KERN_ERR "LCD: failure while initializing the display\n");
+ return (ret);
+ }
+
+#ifdef USE_PROC
+ /* Create entries in /proc/lcd/"driver" */
+ if (driver->driver_proc_root)
+ create_driver_proc_entries(p);
+#endif
+ SET_INIT_LEVEL(p, ++init_level);
+ }
+
+ return (0);
+}
+
+static int do_cleanup_driver(struct lcd_struct *p)
+{
+ int ret, init_level;
+ struct lcd_driver *driver = p->driver;
+
+ switch ((init_level = INIT_LEVEL(p))) {
+ case 3:
+#ifdef USE_PROC
+ if (driver->driver_proc_root)
+ remove_driver_proc_entries(p);
+#endif
+ if (driver->cleanup_display && (ret = driver->cleanup_display())) {
+ printk(KERN_ERR "LCD: failure while cleaning the display\n");
+ return (ret);
+ }
+ SET_INIT_LEVEL(p, --init_level);
+
+ case 2:
+ if ((ret = driver->cleanup_port())) {
+ printk(KERN_ERR "LCD: failure while cleaning the communication port\n");
+ return (ret);
+ }
+ SET_INIT_LEVEL(p, --init_level);
+
+ case 1:
+ if (test_bit(NULL_CHARMAP, &p->struct_flags)) {
+ p->driver->charmap = NULL;
+ clear_bit(NULL_CHARMAP, &p->struct_flags);
+ }
+ vfree(p->fb);
+ p->fb = NULL;
+ SET_INIT_LEVEL(p, --init_level);
+ }
+
+ return (0);
+}
+
+static int init_driver(struct lcd_struct *p)
+{
+ int ret;
+
+ if ((ret = do_init_driver(p))) {
+ do_cleanup_driver(p);
+ printk(KERN_ERR "LCD: init_driver failed\n");
+ }
+
+ return (ret);
+}
+
+static int cleanup_driver(struct lcd_struct *p)
+{
+ int ret;
+
+ if ((ret = do_cleanup_driver(p))) {
+ do_init_driver(p);
+ printk(KERN_ERR "LCD: cleanup_driver failed\n");
+ }
+
+ return (ret);
+}
+
+
+
+
+
+/********************************
+ * Init/Cleanup module routines *
+ ********************************/
+static int __init lcd_linux_init_module(void)
+{
+ int ret;
+
+ if (! minors || minors > 256)
+ minors = LCD_MINORS;
+
+ init_MUTEX(&drivers_sem);
+
+ if ((ret = register_chrdev(major, LCD_LINUX_STRING, &lcd_linux_fops)) < 0) {
+ printk(KERN_ERR "LCD: register_chrdev failed\n");
+ return (ret);
+ }
+ if (major == 0)
+ major = ret;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+ if (IS_ERR((lcd_linux_class = class_create(THIS_MODULE, "lcd")))) {
+ ret = PTR_ERR(lcd_linux_class);
+ unregister_chrdev(major, LCD_LINUX_STRING);
+ return (ret);
+ }
+#endif
+
+#ifdef USE_PROC
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
+ if ((lcd_proc_root = proc_mkdir("lcd", NULL)) == NULL)
+#else
+ if ((lcd_proc_root = proc_mkdir("lcd", &proc_root)) == NULL)
+#endif
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/\n");
+ else if (create_proc_read_entry("drivers", 0, lcd_proc_root, proc_registered_drivers, NULL) == NULL)
+ printk(KERN_ERR "LCD: cannot create /proc/lcd/drivers\n");
+#endif
+
+ printk(KERN_INFO "LCD: --> LCD-Linux " LCD_LINUX_VERSION " <--\n");
+ printk(KERN_INFO "LCD: --> Mattia Jona-Lasinio <mjona@users.sourceforge.net> <--\n" );
+
+
+ return (0);
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 0)
+static void __exit lcd_linux_cleanup_module(void)
+#else
+/* __exit is not defined in 2.2.x kernels */
+static void lcd_linux_cleanup_module(void)
+#endif
+{
+#ifdef USE_PROC
+ if (lcd_proc_root) {
+ remove_proc_entry("drivers", lcd_proc_root);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
+ remove_proc_entry("lcd", NULL);
+#else
+ remove_proc_entry("lcd", &proc_root);
+#endif
+ }
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+ class_destroy(lcd_linux_class);
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
+ unregister_chrdev(major, LCD_LINUX_STRING);
+#else
+ if (unregister_chrdev(major, LCD_LINUX_STRING))
+ printk(KERN_ERR "LCD: unregister_chrdev failed\n");
+#endif
+}
+
+module_init(lcd_linux_init_module)
+module_exit(lcd_linux_cleanup_module)
Index: linux-2.6.30.9/include/linux/hd44780.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/include/linux/hd44780.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,46 @@
+/* hd44780.h
+ *
+ *
+ * LCD-Linux:
+ * Driver for HD44780 compatible displays connected to the parallel port.
+ *
+ * HD44780 header file.
+ *
+ * Copyright (C) 2004 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef HD44780_H
+#define HD44780_H
+
+#include <linux/lcd-linux.h>
+
+#define HD44780_VERSION LCD_LINUX_VERSION /* Version number */
+#define HD44780_STRING "hd44780"
+
+#define HD44780_MINOR 0 /* Minor number for the hd44780 driver */
+
+
+/* flags */
+#define HD44780_CHECK_BF 0x00000001 /* Do busy flag checking */
+#define HD44780_4BITS_BUS 0x00000002 /* Set the bus length to 4 bits */
+#define HD44780_5X10_FONT 0x00000004 /* Use 5x10 dots fonts */
+
+/* IOCTLs */
+#define HD44780_READ_AC _IOR(LCD_MAJOR, 0x00, unsigned char *)
+
+#endif /* HD44780 included */
Index: linux-2.6.30.9/include/linux/lcd-linux.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.9/include/linux/lcd-linux.h 2009-11-24 02:01:42.000000000 +0100
@@ -0,0 +1,151 @@
+/* lcd-linux.h
+ *
+ *
+ * Software layer to drive LCD displays under Linux.
+ *
+ * External interface header file.
+ *
+ * Copyright (C) 2005 - 2007 Mattia Jona-Lasinio (mjona@users.sourceforge.net)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef LCD_LINUX_H
+#define LCD_LINUX_H
+
+#ifndef LCD_LINUX_MAIN
+#warning
+#warning LCD-Linux is still in development stage and
+#warning aims at speed and optimization. For these
+#warning reasons there is no guarantee of backward
+#warning compatibility between different LCD-Linux
+#warning versions. Be sure to use the lcd-linux.h
+#warning file of the same version as the module.
+#warning "http://lcd-linux.sourceforge.net/"
+#warning
+#endif
+
+#define LCD_LINUX_VERSION "0.13.6" /* Version number */
+#define LCD_LINUX_STRING "lcd"
+
+#define LCD_MAJOR 120 /* Major number for this device
+ * Set this to 0 for dynamic allocation
+ */
+#define LCD_MINORS 8 /* Minors allocated for LCD-Linux*/
+
+#include <linux/types.h>
+
+#define str(s) #s
+#define string(s) str(s)
+
+struct lcd_parameters {
+ const char *name; /* Driver's name */
+ unsigned long flags; /* Flags (see documentation) */
+ unsigned short minor; /* Minor number of the char device */
+ unsigned short tabstop; /* Tab character length */
+ unsigned short num_cntr; /* Controllers to drive */
+ unsigned short cntr_rows; /* Rows per controller */
+ unsigned short cntr_cols; /* Display columns */
+ unsigned short vs_rows; /* Virtual screen rows */
+ unsigned short vs_cols; /* Virtual screen columns */
+ unsigned short cgram_chars; /* Number of user definable characters */
+ unsigned short cgram_bytes; /* Number of bytes required to define a
+ * user definable character */
+ unsigned char cgram_char0; /* Ascii of first user definable character */
+};
+
+/* IOCTLs */
+#include <asm/ioctl.h>
+#define LCDL_SET_PARAM _IOW(LCD_MAJOR, 0x80, struct lcd_parameters *)
+#define LCDL_GET_PARAM _IOR(LCD_MAJOR, 0x81, struct lcd_parameters *)
+#define LCDL_CHARSUBST _IOW(LCD_MAJOR, 0x82, unsigned char *)
+#define LCDL_RAW_MODE _IOW(LCD_MAJOR, 0x83, unsigned int)
+#define LCDL_RESET_CHARMAP _IO(LCD_MAJOR, 0x84)
+#define LCDL_SAVE_CHARMAP _IO(LCD_MAJOR, 0x85)
+#define LCDL_RESTORE_CHARMAP _IO(LCD_MAJOR, 0x86)
+#define LCDL_SWAP_CHARMAP _IO(LCD_MAJOR, 0x87)
+#define LCDL_CLEAR_DISP _IO(LCD_MAJOR, 0x88)
+#define LCDL_SET_CGRAM_CHAR _IOW(LCD_MAJOR, 0x89, unsigned char *)
+#define LCDL_GET_CGRAM_CHAR _IOR(LCD_MAJOR, 0x8a, unsigned char *)
+#define LCDL_SET_CHARMAP _IOW(LCD_MAJOR, 0x8b, unsigned char *)
+#define LCDL_GET_CHARMAP _IOR(LCD_MAJOR, 0x8c, unsigned char *)
+#define LCDL_MEMSET _IOW(LCD_MAJOR, 0x8d, unsigned int *)
+#define LCDL_MEMMOVE _IOW(LCD_MAJOR, 0x8e, unsigned int *)
+
+
+
+#ifdef __KERNEL__ /* The rest is for kernel only */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+
+struct lcd_driver {
+ void (*read_char)(unsigned int offset, unsigned short *data);
+ void (*read_cgram_char)(unsigned char index, unsigned char *pixmap);
+ void (*write_char)(unsigned int offset, unsigned short data);
+ void (*write_cgram_char)(unsigned char index, unsigned char *pixmap);
+ void (*clear_display)(void);
+ void (*address_mode)(int mode);
+ int (*validate_driver)(void);
+ int (*init_display)(void);
+ int (*cleanup_display)(void);
+ int (*init_port)(void);
+ int (*cleanup_port)(void);
+ int (*handle_custom_char)(unsigned int data);
+ int (*handle_custom_ioctl)(unsigned int cmd, unsigned long arg, unsigned int arg_in_userspace);
+
+ /* The character map to be used */
+ unsigned char *charmap;
+
+ /* The root where the driver can create its own proc files.
+ * Will be filled by the lcd-linux layer.
+ */
+ struct proc_dir_entry *driver_proc_root;
+
+ /* Set this field to 'driver_module_init' or call lcd_driver_setup
+ * just before registering the driver with lcd_register_driver.
+ */
+ struct module *driver_module;
+};
+
+#ifdef MODULE
+#define driver_module_init THIS_MODULE
+#else
+#define driver_module_init NULL
+#endif
+
+/* Always call lcd_driver_setup just before registering the driver
+ * with lcd_register_driver.
+ */
+static inline void lcd_driver_setup(struct lcd_driver *p)
+{
+ p->driver_module = driver_module_init;
+}
+
+/* External interface */
+struct lcd_struct;
+int lcd_register_driver(struct lcd_driver *drv, struct lcd_parameters *par);
+int lcd_unregister_driver(struct lcd_driver *drv, struct lcd_parameters *par);
+int lcd_open(unsigned short minor, struct lcd_struct **lcd);
+int lcd_close(struct lcd_struct **lcd);
+int lcd_ioctl(struct lcd_struct *lcd, unsigned int cmd, ...);
+ssize_t lcd_write(struct lcd_struct *lcd, const void *buffer, size_t length, loff_t offset, unsigned int);
+ssize_t lcd_read(struct lcd_struct *lcd, void *buffer, size_t length, loff_t offset, unsigned int);
+
+#endif /* __KERNEL__ */
+
+#endif /* External interface included */
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