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openwrt-xburst/target/linux/au1000/patches/006-mtx1_system_button.patch

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diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c 2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c 2006-04-23 11:54:31.000000000 +0200
@@ -64,6 +64,7 @@
{ AU1500_GPIO_202, INTC_INT_LOW_LEVEL, 0 },
{ AU1500_GPIO_203, INTC_INT_LOW_LEVEL, 0 },
{ AU1500_GPIO_205, INTC_INT_LOW_LEVEL, 0 },
+ { AU1500_GPIO_207, INTC_INT_RISE_AND_FALL_EDGE, 0 },
};
int au1xxx_nr_irqs = sizeof(au1xxx_irq_map)/sizeof(au1xxx_irq_map_t);
diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile 2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile 2006-04-23 14:01:36.000000000 +0200
@@ -8,3 +8,4 @@
#
lib-y := init.o board_setup.o irqmap.o
+obj-y := mtx-1_sysbtn.o
diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c
--- linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c 2006-04-23 14:01:17.000000000 +0200
@@ -0,0 +1,218 @@
+/*
+ * Driver for the MTX-1 System Button.
+ *
+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
+ * http://www.4g-systems.biz
+ *
+ * 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.
+ *
+ * Neither Michael Stickel nor 4G Systeme GmbH admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>
+ *
+ * Release 0.01.
+ *
+ * Author: Michael Stickel michael.stickel@4g-systems.biz
+ *
+ *
+ * After the module is loaded there is a device /dev/misc/btn
+ * that can be read. It returns one char '1' if the button
+ * has been pressed an '0' if it has been released.
+ */
+#include <linux/autoconf.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <asm/uaccess.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+
+#ifndef FALSE
+# define FALSE (0)
+#endif
+
+#ifndef TRUE
+# define TRUE (!FALSE)
+#endif
+
+
+//---------[ declarations ]-----------------
+
+
+static DECLARE_WAIT_QUEUE_HEAD(mtx1btn_wait_queue);
+static char state_changed;
+static char last_value;
+static char is_inuse;
+
+
+//---------[ Hardware Functions ]-----------------
+
+// The MTX-1 Button is attached to GPIO207.
+#define MTX1_GPIO2_SYSBTN (7)
+#define MTX1_SYSBTN_IRQ (AU1500_GPIO_207)
+
+
+static char mtx1_getbtn (int btnno)
+{
+ if (btnno==0) {
+ return (au_readl(GPIO2_PINSTATE) & (1<<MTX1_GPIO2_SYSBTN)) ? 0 : 1;
+ }
+ return 0;
+}
+
+static void mtx1_initbuttons (void)
+{
+ au_writel (au_readl(GPIO2_DIR) & ~(1<<MTX1_GPIO2_SYSBTN), GPIO2_DIR);
+}
+
+
+//---------[ Interrupt handling ]-----------------
+
+
+static void mtx1_btn_interrupt (int irq, void *private)
+{
+ char value = mtx1_getbtn(0);
+ if (last_value != value)
+ {
+ last_value = value;
+ state_changed = 1;
+ wake_up (&mtx1btn_wait_queue);
+ }
+// kill_fasync(&async_queue, SIGIO, POLL_OUT);
+}
+
+
+static int mtx1_btn_startirq (void)
+{
+ if (!request_irq (MTX1_SYSBTN_IRQ, mtx1_btn_interrupt, 0 /* | SA_INTERRUPT */, "mtx1btn", (void *)&state_changed)) {
+ return 0;
+ }
+ return -1;
+}
+
+static int mtx1_btn_stopirq (void)
+{
+ free_irq(MTX1_SYSBTN_IRQ, (void *)&state_changed);
+ return 0;
+}
+
+
+
+//---------[ File Functions ]-----------------
+
+
+static int mtx1sysbtn_minor = -1;
+
+
+static int mtx1sysbtn_open (struct inode *inode, struct file *file)
+{
+ if (MINOR(inode->i_rdev)!=mtx1sysbtn_minor) return -ENODEV;
+ if (is_inuse) return -EBUSY;
+ is_inuse=1;
+ last_value = mtx1_getbtn(0);
+ state_changed = 0;
+ return 0;
+}
+
+
+static int mtx1sysbtn_release (struct inode *inode, struct file *file) {
+ if (MINOR(inode->i_rdev)==mtx1sysbtn_minor) {
+ is_inuse=0;
+ }
+ return 0;
+}
+
+
+static ssize_t mtx1sysbtn_read (struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+ if (count < 1)
+ return -EINVAL;
+ if (!state_changed)
+ interruptible_sleep_on (&mtx1btn_wait_queue);
+ state_changed = 0;
+ char c = last_value ? '1' : '0'; /* mtx1_getbtn(0) */
+ if(copy_to_user(buf, &c, 1))
+ return -EFAULT;
+ return 1;
+}
+
+
+static unsigned int mtx1sysbtn_poll (struct file *file, poll_table * wait)
+{
+ unsigned int mask = 0;
+
+ poll_wait (file, &mtx1btn_wait_queue, wait);
+
+ if (state_changed) // state changed since last time.
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+
+
+static struct file_operations mtx1sysbtn_fops = {
+ .owner = THIS_MODULE,
+ .read = mtx1sysbtn_read,
+ .poll = mtx1sysbtn_poll,
+ .open = mtx1sysbtn_open,
+ .release = mtx1sysbtn_release
+};
+
+
+static struct miscdevice mtx1sysbtn_miscdev = {
+ MISC_DYNAMIC_MINOR /* SYSBTN_MINOR */ ,
+ "btn",
+ &mtx1sysbtn_fops
+};
+
+
+
+//---------[ Module Functions ]-----------------
+
+
+void __exit exit_mtx1_sysbtn (void)
+{
+ is_inuse = 1;
+ mtx1_btn_stopirq ();
+ misc_deregister(&mtx1sysbtn_miscdev);
+}
+
+
+static int __init init_mtx1_sysbtn (void)
+{
+ printk("MTX-1 System Button driver\n");
+ is_inuse = 1;
+ mtx1_initbuttons ();
+ if (misc_register (&mtx1sysbtn_miscdev) >= 0) {
+ mtx1sysbtn_minor = mtx1sysbtn_miscdev.minor;
+ if (mtx1_btn_startirq () == 0) {
+ is_inuse=0;
+ return 0;
+ }
+ misc_deregister(&mtx1sysbtn_miscdev);
+ }
+ return 1;
+}
+
+module_init(init_mtx1_sysbtn);
+module_exit(exit_mtx1_sysbtn);
+
+MODULE_AUTHOR("Michael Stickel");
+MODULE_DESCRIPTION("Driver for the MTX-1 system button");
+MODULE_LICENSE("GPL");
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