openwrt/target/linux/atheros/patches-2.6.38/210-reset_button.patch

--- a/arch/mips/ar231x/Makefile
+++ b/arch/mips/ar231x/Makefile
@@ -8,7 +8,7 @@
 # Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
 #
 
-obj-y += board.o prom.o devices.o
+obj-y += board.o prom.o devices.o reset.o
 
 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
 
--- /dev/null
+++ b/arch/mips/ar231x/reset.c
@@ -0,0 +1,161 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/kobject.h>
+#include <linux/workqueue.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <ar231x_platform.h>
+#include <ar231x.h>
+#include <gpio.h>
+#include "devices.h"
+
+#define AR531X_RESET_GPIO_IRQ	(AR531X_GPIO_IRQ(ar231x_board.config->resetConfigGpio))
+
+struct event_t {
+	struct work_struct wq;
+	int set;
+	unsigned long jiffies;
+};
+
+static struct timer_list rst_button_timer;
+static unsigned long seen;
+
+struct sock *uevent_sock = NULL;
+EXPORT_SYMBOL_GPL(uevent_sock);
+extern u64 uevent_next_seqnum(void);
+
+static int no_release_workaround = 1;
+module_param(no_release_workaround, int, 0);
+
+static inline void
+add_msg(struct sk_buff *skb, char *msg)
+{
+	char *scratch;
+	scratch = skb_put(skb, strlen(msg) + 1);
+	sprintf(scratch, msg);
+}
+
+static void
+hotplug_button(struct work_struct *wq)
+{
+	struct sk_buff *skb;
+	struct event_t *event;
+	size_t len;
+	char *scratch, *s;
+	char buf[128];
+
+	event = container_of(wq, struct event_t, wq);
+	if (!uevent_sock)
+		goto done;
+
+	/* allocate message with the maximum possible size */
+	s = event->set ? "pressed" : "released";
+	len = strlen(s) + 2;
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		goto done;
+
+	/* add header */
+	scratch = skb_put(skb, len);
+	sprintf(scratch, "%s@",s);
+
+	/* copy keys to our continuous event payload buffer */
+	add_msg(skb, "HOME=/");
+	add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
+	add_msg(skb, "SUBSYSTEM=button");
+	add_msg(skb, "BUTTON=reset");
+	add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
+	sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
+	add_msg(skb, buf);
+	snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
+	add_msg(skb, buf);
+
+	NETLINK_CB(skb).dst_group = 1;
+	netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
+
+done:
+	kfree(event);
+}
+
+static void
+reset_button_poll(unsigned long unused)
+{
+	struct event_t *event;
+	int gpio = ~0;
+
+	if(!no_release_workaround)
+		return;
+
+	gpio = ar231x_gpiodev->get();
+	gpio &= (1 << (AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE));
+	if(gpio) {
+		rst_button_timer.expires = jiffies + (HZ / 4);
+		add_timer(&rst_button_timer);
+		return;
+	}
+
+	event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
+	if (!event)
+		return;
+
+	event->set = 0;
+	event->jiffies = jiffies;
+	INIT_WORK(&event->wq, hotplug_button);
+	schedule_work(&event->wq);
+}
+
+static irqreturn_t
+button_handler(int irq, void *dev_id)
+{
+	static int pressed = 0;
+	struct event_t *event;
+	u32 gpio = ~0;
+
+	event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
+	if (!event)
+		return IRQ_NONE;
+
+	pressed = !pressed;
+
+	gpio = ar231x_gpiodev->get() & (1 << (irq - AR531X_GPIO_IRQ_BASE));
+
+	event->set = gpio;
+	if(!event->set)
+		no_release_workaround = 0;
+
+	event->jiffies = jiffies;
+
+	INIT_WORK(&event->wq, hotplug_button);
+	schedule_work(&event->wq);
+
+	seen = jiffies;
+	if(event->set && no_release_workaround)
+		mod_timer(&rst_button_timer, jiffies + (HZ / 4));
+
+	return IRQ_HANDLED;
+}
+
+
+static int __init
+ar231x_init_reset(void)
+{
+	seen = jiffies;
+
+	if (ar231x_board.config->resetConfigGpio == 0xffff)
+		return -ENODEV;
+
+	init_timer(&rst_button_timer);
+	rst_button_timer.function = reset_button_poll;
+	rst_button_timer.expires = jiffies + HZ / 50;
+	add_timer(&rst_button_timer);
+
+	request_irq(AR531X_RESET_GPIO_IRQ, &button_handler, IRQF_SAMPLE_RANDOM, "ar231x_reset", NULL);
+
+	return 0;
+}
+
+module_init(ar231x_init_reset);