| 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); |
| 176 | |
