From cb0cdd5f614d723139331ecf56d28e529ff9b74c Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen <lars@metafoo.de> Date: Sun, 1 Aug 2010 21:19:40 +0200 Subject: [PATCH] Add ili8960 lcd driver --- drivers/video/backlight/Kconfig | 7 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/ili8960.c | 253 +++++++++++++++++++++++++++++++++++++ 3 files changed, 261 insertions(+), 0 deletions(-) create mode 100644 drivers/video/backlight/ili8960.c --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -59,6 +59,13 @@ config LCD_LTV350QV The LTV350QV panel is present on all ATSTK1000 boards. +config LCD_ILI8960 + tristate "Ilitek ili8960 LCD driver" + depends on LCD_CLASS_DEVICE && SPI + default n + help + Driver for the Ilitek ili8960 LCD controller chip. + config LCD_ILI9320 tristate help --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700) += jornada72 obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o +obj-$(CONFIG_LCD_ILI8960) += ili8960.o obj-$(CONFIG_LCD_ILI9320) += ili9320.o obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o --- /dev/null +++ b/drivers/video/backlight/ili8960.c @@ -0,0 +1,253 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> + * Driver for Ilitek ili8960 LCD + * + * 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. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/lcd.h> +#include <linux/backlight.h> +#include <linux/delay.h> + +struct ili8960 { + struct spi_device *spi; + struct lcd_device *lcd; + struct backlight_device *bl; + bool enabled; + int brightness; +}; + +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg, + uint8_t data) +{ + uint8_t buf[2]; + buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f); + buf[1] = data; + + return spi_write(spi, buf, sizeof(buf)); +} + +static int ili8960_programm_power(struct spi_device *spi, bool enabled) +{ + int ret; + + if (enabled) + mdelay(20); + + ret = ili8960_write_reg(spi, 0x5, enabled ? 0xc7 : 0xc6); + + if (!enabled) + mdelay(20); + + return ret; +} + +static int ili8960_set_power(struct lcd_device *lcd, int power) +{ + struct ili8960 *ili8960 = lcd_get_data(lcd); + + switch (power) { + case FB_BLANK_UNBLANK: + ili8960->enabled = true; + break; + default: + ili8960->enabled = false; + break; + } + + return ili8960_programm_power(ili8960->spi, ili8960->enabled); +} + +static int ili8960_get_power(struct lcd_device *lcd) +{ + struct ili8960 *ili8960 = lcd_get_data(lcd); + return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; +} + +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast) +{ + struct ili8960 *ili8960 = lcd_get_data(lcd); + ili8960_write_reg(ili8960->spi, 0x0d, contrast); + + return 0; +} + +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) +{ + if (mode->xres != 320 && mode->yres != 240) + return -EINVAL; + + return 0; +} + +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness) +{ + int ret; + ret = ili8960_write_reg(ili8960->spi, 0x3, brightness); + + if (ret == 0) + ili8960->brightness = brightness; + + return ret; +} + +static ssize_t ili8960_show_brightness(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lcd_device *ld = to_lcd_device(dev); + struct ili8960 *ili8960 = lcd_get_data(ld); + + return sprintf(buf, "%d\n", ili8960->brightness); +} + +static ssize_t ili8960_store_brightness(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + char *endp; + struct lcd_device *ld = to_lcd_device(dev); + struct ili8960 *ili8960 = lcd_get_data(ld); + int brightness = simple_strtoul(buf, &endp, 0); + + if (brightness > 255 || brightness < 0) + return -EINVAL; + + ili8960_set_brightness(ili8960, brightness); + + return count; +} + + +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness, + ili8960_store_brightness); + +static struct lcd_ops ili8960_lcd_ops = { + .set_power = ili8960_set_power, + .get_power = ili8960_get_power, + .set_contrast = ili8960_set_contrast, + .set_mode = ili8960_set_mode, +}; + +static int __devinit ili8960_probe(struct spi_device *spi) +{ + int ret; + struct ili8960 *ili8960; + + ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL); + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_3; + + ret = spi_setup(spi); + if (ret) { + dev_err(&spi->dev, "Failed to setup spi\n"); + goto err_free_ili8960; + } + + ili8960->spi = spi; + + ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960, + &ili8960_lcd_ops); + + if (IS_ERR(ili8960->lcd)) { + ret = PTR_ERR(ili8960->lcd); + dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret); + goto err_free_ili8960; + } + + ili8960->lcd->props.max_contrast = 255; + + ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness); + if (ret) + goto err_unregister_lcd; + + ili8960_programm_power(ili8960->spi, true); + ili8960->enabled = true; + dev_set_drvdata(&spi->dev, ili8960); + + ili8960_write_reg(spi, 0x13, 0x01); + ili8960_write_reg(spi, 0x5, 0xc7); + + return 0; +err_unregister_lcd: + lcd_device_unregister(ili8960->lcd); +err_free_ili8960: + kfree(ili8960); + return ret; +} + +static int __devexit ili8960_remove(struct spi_device *spi) +{ + struct ili8960 *ili8960 = spi_get_drvdata(spi); + + device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness); + lcd_device_unregister(ili8960->lcd); + + spi_set_drvdata(spi, NULL); + kfree(ili8960); + return 0; +} + +#ifdef CONFIG_PM + +static int ili8960_suspend(struct spi_device *spi, pm_message_t state) +{ + struct ili8960 *ili8960 = spi_get_drvdata(spi); + + if (ili8960->enabled) + ili8960_programm_power(ili8960->spi, false); + + return 0; +} + +static int ili8960_resume(struct spi_device *spi) +{ + struct ili8960 *ili8960 = spi_get_drvdata(spi); + + if (ili8960->enabled) + ili8960_programm_power(ili8960->spi, true); + + return 0; +} + +#else +#define ili8960_suspend NULL +#define ili8960_resume NULL +#endif + +static struct spi_driver ili8960_driver = { + .driver = { + .name = "ili8960", + .owner = THIS_MODULE, + }, + .probe = ili8960_probe, + .remove = __devexit_p(ili8960_remove), + .suspend = ili8960_suspend, + .resume = ili8960_resume, +}; + +static int __init ili8960_init(void) +{ + return spi_register_driver(&ili8960_driver); +} +module_init(ili8960_init); + +static void __exit ili8960_exit(void) +{ + spi_unregister_driver(&ili8960_driver); +} +module_exit(ili8960_exit) + +MODULE_AUTHOR("Lars-Peter Clausen"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960"); +MODULE_ALIAS("spi:ili8960");