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