target/linux/atheros/patches-2.6.32/210-reset_button.patch

   1 Index: linux-2.6.32.7/arch/mips/ar231x/Makefile
   2 ===================================================================
   3 --- linux-2.6.32.7.orig/arch/mips/ar231x/Makefile       2010-02-03 17:00:21.031428952 +0100
   4 +++ linux-2.6.32.7/arch/mips/ar231x/Makefile    2010-02-03 17:02:36.795429223 +0100
   5 @@ -8,7 +8,7 @@
   6  # Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
   7  #
   8
   9 -obj-y += board.o prom.o devices.o
  10 +obj-y += board.o prom.o devices.o reset.o
  11  obj-$(CONFIG_ATHEROS_AR5312) += ar5312.o
  12  obj-$(CONFIG_ATHEROS_AR2315) += ar2315.o
  13  obj-$(CONFIG_ATHEROS_AR2315_PCI) += pci.o
  14 Index: linux-2.6.32.7/arch/mips/ar231x/reset.c
  15 ===================================================================
  16 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  17 +++ linux-2.6.32.7/arch/mips/ar231x/reset.c     2010-02-03 17:02:36.795429223 +0100
  18 @@ -0,0 +1,160 @@
  19 +#include <linux/init.h>
  20 +#include <linux/module.h>
  21 +#include <linux/timer.h>
  22 +#include <linux/interrupt.h>
  23 +#include <linux/kobject.h>
  24 +#include <linux/workqueue.h>
  25 +#include <linux/skbuff.h>
  26 +#include <linux/netlink.h>
  27 +#include <net/sock.h>
  28 +#include <asm/uaccess.h>
  29 +#include <ar231x_platform.h>
  30 +#include <ar231x.h>
  31 +#include <gpio.h>
  32 +#include "devices.h"
  33 +
  34 +#define AR531X_RESET_GPIO_IRQ  (AR531X_GPIO_IRQ(ar231x_board.config->resetConfigGpio))
  35 +
  36 +struct event_t {
  37 +       struct work_struct wq;
  38 +       int set;
  39 +       unsigned long jiffies;
  40 +};
  41 +
  42 +static struct timer_list rst_button_timer;
  43 +static unsigned long seen;
  44 +
  45 +extern struct sock *uevent_sock;
  46 +extern u64 uevent_next_seqnum(void);
  47 +
  48 +static int no_release_workaround = 1;
  49 +module_param(no_release_workaround, int, 0);
  50 +
  51 +static inline void
  52 +add_msg(struct sk_buff *skb, char *msg)
  53 +{
  54 +       char *scratch;
  55 +       scratch = skb_put(skb, strlen(msg) + 1);
  56 +       sprintf(scratch, msg);
  57 +}
  58 +
  59 +static void
  60 +hotplug_button(struct work_struct *wq)
  61 +{
  62 +       struct sk_buff *skb;
  63 +       struct event_t *event;
  64 +       size_t len;
  65 +       char *scratch, *s;
  66 +       char buf[128];
  67 +
  68 +       event = container_of(wq, struct event_t, wq);
  69 +       if (!uevent_sock)
  70 +               goto done;
  71 +
  72 +       /* allocate message with the maximum possible size */
  73 +       s = event->set ? "pressed" : "released";
  74 +       len = strlen(s) + 2;
  75 +       skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
  76 +       if (!skb)
  77 +               goto done;
  78 +
  79 +       /* add header */
  80 +       scratch = skb_put(skb, len);
  81 +       sprintf(scratch, "%s@",s);
  82 +
  83 +       /* copy keys to our continuous event payload buffer */
  84 +       add_msg(skb, "HOME=/");
  85 +       add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
  86 +       add_msg(skb, "SUBSYSTEM=button");
  87 +       add_msg(skb, "BUTTON=reset");
  88 +       add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
  89 +       sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
  90 +       add_msg(skb, buf);
  91 +       snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
  92 +       add_msg(skb, buf);
  93 +
  94 +       NETLINK_CB(skb).dst_group = 1;
  95 +       netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
  96 +
  97 +done:
  98 +       kfree(event);
  99 +}
 100 +
 101 +static void
 102 +reset_button_poll(unsigned long unused)
 103 +{
 104 +       struct event_t *event;
 105 +       int gpio = ~0;
 106 +
 107 +       if(!no_release_workaround)
 108 +               return;
 109 +
 110 +       gpio = ar231x_gpiodev->get();
 111 +       gpio &= (1 << (AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE));
 112 +       if(gpio) {
 113 +               rst_button_timer.expires = jiffies + (HZ / 4);
 114 +               add_timer(&rst_button_timer);
 115 +               return;
 116 +       }
 117 +
 118 +       event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 119 +       if (!event)
 120 +               return;
 121 +
 122 +       event->set = 0;
 123 +       event->jiffies = jiffies;
 124 +       INIT_WORK(&event->wq, hotplug_button);
 125 +       schedule_work(&event->wq);
 126 +}
 127 +
 128 +static irqreturn_t
 129 +button_handler(int irq, void *dev_id)
 130 +{
 131 +       static int pressed = 0;
 132 +       struct event_t *event;
 133 +       u32 gpio = ~0;
 134 +
 135 +       event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 136 +       if (!event)
 137 +               return IRQ_NONE;
 138 +
 139 +       pressed = !pressed;
 140 +
 141 +       gpio = ar231x_gpiodev->get() & (1 << (irq - AR531X_GPIO_IRQ_BASE));
 142 +
 143 +       event->set = gpio;
 144 +       if(!event->set)
 145 +               no_release_workaround = 0;
 146 +
 147 +       event->jiffies = jiffies;
 148 +
 149 +       INIT_WORK(&event->wq, hotplug_button);
 150 +       schedule_work(&event->wq);
 151 +
 152 +       seen = jiffies;
 153 +       if(event->set && no_release_workaround)
 154 +               mod_timer(&rst_button_timer, jiffies + (HZ / 4));
 155 +
 156 +       return IRQ_HANDLED;
 157 +}
 158 +
 159 +
 160 +static int __init
 161 +ar231x_init_reset(void)
 162 +{
 163 +       seen = jiffies;
 164 +
 165 +       if (ar231x_board.config->resetConfigGpio == 0xffff)
 166 +               return -ENODEV;
 167 +
 168 +       init_timer(&rst_button_timer);
 169 +       rst_button_timer.function = reset_button_poll;
 170 +       rst_button_timer.expires = jiffies + HZ / 50;
 171 +       add_timer(&rst_button_timer);
 172 +
 173 +       request_irq(AR531X_RESET_GPIO_IRQ, &button_handler, IRQF_SAMPLE_RANDOM, "ar231x_reset", NULL);
 174 +
 175 +       return 0;
 176 +}
 177 +
 178 +module_init(ar231x_init_reset);