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

   1 --- a/arch/mips/ar231x/Makefile
   2 +++ b/arch/mips/ar231x/Makefile
   3 @@ -8,7 +8,7 @@
   4  # Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
   5  #
   6
   7 -obj-y += board.o prom.o devices.o
   8 +obj-y += board.o prom.o devices.o reset.o
   9
  10  obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
  11
  12 --- /dev/null
  13 +++ b/arch/mips/ar231x/reset.c
  14 @@ -0,0 +1,161 @@
  15 +#include <linux/init.h>
  16 +#include <linux/module.h>
  17 +#include <linux/timer.h>
  18 +#include <linux/interrupt.h>
  19 +#include <linux/kobject.h>
  20 +#include <linux/workqueue.h>
  21 +#include <linux/skbuff.h>
  22 +#include <linux/netlink.h>
  23 +#include <net/sock.h>
  24 +#include <asm/uaccess.h>
  25 +#include <ar231x_platform.h>
  26 +#include <ar231x.h>
  27 +#include <gpio.h>
  28 +#include "devices.h"
  29 +
  30 +#define AR531X_RESET_GPIO_IRQ  (AR531X_GPIO_IRQ(ar231x_board.config->resetConfigGpio))
  31 +
  32 +struct event_t {
  33 +       struct work_struct wq;
  34 +       int set;
  35 +       unsigned long jiffies;
  36 +};
  37 +
  38 +static struct timer_list rst_button_timer;
  39 +static unsigned long seen;
  40 +
  41 +struct sock *uevent_sock = NULL;
  42 +EXPORT_SYMBOL_GPL(uevent_sock);
  43 +extern u64 uevent_next_seqnum(void);
  44 +
  45 +static int no_release_workaround = 1;
  46 +module_param(no_release_workaround, int, 0);
  47 +
  48 +static inline void
  49 +add_msg(struct sk_buff *skb, char *msg)
  50 +{
  51 +       char *scratch;
  52 +       scratch = skb_put(skb, strlen(msg) + 1);
  53 +       sprintf(scratch, msg);
  54 +}
  55 +
  56 +static void
  57 +hotplug_button(struct work_struct *wq)
  58 +{
  59 +       struct sk_buff *skb;
  60 +       struct event_t *event;
  61 +       size_t len;
  62 +       char *scratch, *s;
  63 +       char buf[128];
  64 +
  65 +       event = container_of(wq, struct event_t, wq);
  66 +       if (!uevent_sock)
  67 +               goto done;
  68 +
  69 +       /* allocate message with the maximum possible size */
  70 +       s = event->set ? "pressed" : "released";
  71 +       len = strlen(s) + 2;
  72 +       skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
  73 +       if (!skb)
  74 +               goto done;
  75 +
  76 +       /* add header */
  77 +       scratch = skb_put(skb, len);
  78 +       sprintf(scratch, "%s@",s);
  79 +
  80 +       /* copy keys to our continuous event payload buffer */
  81 +       add_msg(skb, "HOME=/");
  82 +       add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
  83 +       add_msg(skb, "SUBSYSTEM=button");
  84 +       add_msg(skb, "BUTTON=reset");
  85 +       add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
  86 +       sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
  87 +       add_msg(skb, buf);
  88 +       snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
  89 +       add_msg(skb, buf);
  90 +
  91 +       NETLINK_CB(skb).dst_group = 1;
  92 +       netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
  93 +
  94 +done:
  95 +       kfree(event);
  96 +}
  97 +
  98 +static void
  99 +reset_button_poll(unsigned long unused)
 100 +{
 101 +       struct event_t *event;
 102 +       int gpio = ~0;
 103 +
 104 +       if(!no_release_workaround)
 105 +               return;
 106 +
 107 +       gpio = ar231x_gpiodev->get();
 108 +       gpio &= (1 << (AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE));
 109 +       if(gpio) {
 110 +               rst_button_timer.expires = jiffies + (HZ / 4);
 111 +               add_timer(&rst_button_timer);
 112 +               return;
 113 +       }
 114 +
 115 +       event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 116 +       if (!event)
 117 +               return;
 118 +
 119 +       event->set = 0;
 120 +       event->jiffies = jiffies;
 121 +       INIT_WORK(&event->wq, hotplug_button);
 122 +       schedule_work(&event->wq);
 123 +}
 124 +
 125 +static irqreturn_t
 126 +button_handler(int irq, void *dev_id)
 127 +{
 128 +       static int pressed = 0;
 129 +       struct event_t *event;
 130 +       u32 gpio = ~0;
 131 +
 132 +       event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 133 +       if (!event)
 134 +               return IRQ_NONE;
 135 +
 136 +       pressed = !pressed;
 137 +
 138 +       gpio = ar231x_gpiodev->get() & (1 << (irq - AR531X_GPIO_IRQ_BASE));
 139 +
 140 +       event->set = gpio;
 141 +       if(!event->set)
 142 +               no_release_workaround = 0;
 143 +
 144 +       event->jiffies = jiffies;
 145 +
 146 +       INIT_WORK(&event->wq, hotplug_button);
 147 +       schedule_work(&event->wq);
 148 +
 149 +       seen = jiffies;
 150 +       if(event->set && no_release_workaround)
 151 +               mod_timer(&rst_button_timer, jiffies + (HZ / 4));
 152 +
 153 +       return IRQ_HANDLED;
 154 +}
 155 +
 156 +
 157 +static int __init
 158 +ar231x_init_reset(void)
 159 +{
 160 +       seen = jiffies;
 161 +
 162 +       if (ar231x_board.config->resetConfigGpio == 0xffff)
 163 +               return -ENODEV;
 164 +
 165 +       init_timer(&rst_button_timer);
 166 +       rst_button_timer.function = reset_button_poll;
 167 +       rst_button_timer.expires = jiffies + HZ / 50;
 168 +       add_timer(&rst_button_timer);
 169 +
 170 +       request_irq(AR531X_RESET_GPIO_IRQ, &button_handler, IRQF_SAMPLE_RANDOM, "ar231x_reset", NULL);
 171 +
 172 +       return 0;
 173 +}
 174 +
 175 +module_init(ar231x_init_reset);