1 #include <linux/module.h>
2 #include <linux/timer.h>
3 #include <linux/interrupt.h>
4 #include <linux/kobject.h>
5 #include <linux/workqueue.h>
6 #include <linux/skbuff.h>
7 #include <linux/netlink.h>
9 #include <asm/uaccess.h>
12 #define AR531X_RESET_GPIO_IRQ (AR531X_GPIO_IRQ(bcfg->resetConfigGpio))
15 struct work_struct wq;
17 unsigned long jiffies;
20 static struct ar531x_boarddata *bcfg;
22 extern struct sock *uevent_sock;
23 extern u64 uevent_next_seqnum(void);
24 static unsigned long seen;
26 static inline void add_msg(struct sk_buff *skb, char *msg)
29 scratch = skb_put(skb, strlen(msg) + 1);
30 sprintf(scratch, msg);
33 static void hotplug_button(struct work_struct *wq)
36 struct event_t *event;
41 event = container_of(wq, struct event_t, wq);
45 /* allocate message with the maximum possible size */
46 s = event->set ? "pressed" : "released";
48 skb = alloc_skb(len + 2048, GFP_KERNEL);
53 scratch = skb_put(skb, len);
54 sprintf(scratch, "%s@",s);
56 /* copy keys to our continuous event payload buffer */
57 add_msg(skb, "HOME=/");
58 add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
59 add_msg(skb, "SUBSYSTEM=button");
60 add_msg(skb, "BUTTON=reset");
61 add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
62 sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
64 snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
67 NETLINK_CB(skb).dst_group = 1;
68 netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
74 static irqreturn_t button_handler(int irq, void *dev_id)
76 static int pressed = 0;
77 struct event_t *event;
80 event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
86 DO_AR5315(gpio = sysRegRead(AR5315_GPIO_DI);)
87 gpio &= 1 << (irq - AR531X_GPIO_IRQ_BASE);
90 event->jiffies = jiffies;
92 INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
93 schedule_work(&event->wq);
100 void ar531x_disable_reset_button(void)
102 disable_irq(AR531X_RESET_GPIO_IRQ);
105 EXPORT_SYMBOL(ar531x_disable_reset_button);
107 int __init ar531x_init_reset(void)
109 bcfg = (struct ar531x_boarddata *) board_config;
113 request_irq(AR531X_RESET_GPIO_IRQ, &button_handler, IRQF_SAMPLE_RANDOM, "ar531x_reset", NULL);
120 module_init(ar531x_init_reset);