diff options
Diffstat (limited to 'target/linux/atheros/files-2.6.26/arch/mips/atheros/reset.c')
| -rw-r--r-- | target/linux/atheros/files-2.6.26/arch/mips/atheros/reset.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/target/linux/atheros/files-2.6.26/arch/mips/atheros/reset.c b/target/linux/atheros/files-2.6.26/arch/mips/atheros/reset.c new file mode 100644 index 000000000..eb525da20 --- /dev/null +++ b/target/linux/atheros/files-2.6.26/arch/mips/atheros/reset.c @@ -0,0 +1,162 @@ +#include <linux/module.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/kobject.h> +#include <linux/workqueue.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <net/sock.h> +#include <asm/uaccess.h> +#include <ar531x.h> + +#define AR531X_RESET_GPIO_IRQ (AR531X_GPIO_IRQ(bcfg->resetConfigGpio)) + +struct event_t { + struct work_struct wq; + int set; + unsigned long jiffies; +}; + +static struct ar531x_boarddata *bcfg; +static struct timer_list rst_button_timer; + +extern struct sock *uevent_sock; +extern u64 uevent_next_seqnum(void); +static unsigned long seen; + +static inline void add_msg(struct sk_buff *skb, char *msg) +{ + char *scratch; + scratch = skb_put(skb, strlen(msg) + 1); + sprintf(scratch, msg); +} + +static void hotplug_button(struct work_struct *wq) +{ + struct sk_buff *skb; + struct event_t *event; + size_t len; + char *scratch, *s; + char buf[128]; + + event = container_of(wq, struct event_t, wq); + if (!uevent_sock) + goto done; + + /* allocate message with the maximum possible size */ + s = event->set ? "pressed" : "released"; + len = strlen(s) + 2; + skb = alloc_skb(len + 2048, GFP_KERNEL); + if (!skb) + goto done; + + /* add header */ + scratch = skb_put(skb, len); + sprintf(scratch, "%s@",s); + + /* copy keys to our continuous event payload buffer */ + add_msg(skb, "HOME=/"); + add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin"); + add_msg(skb, "SUBSYSTEM=button"); + add_msg(skb, "BUTTON=reset"); + add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released")); + sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ); + add_msg(skb, buf); + snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum()); + add_msg(skb, buf); + + NETLINK_CB(skb).dst_group = 1; + netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL); + +done: + kfree(event); +} + +static int no_release_workaround = 1; + +static void +reset_button_poll(unsigned long unused) +{ + struct event_t *event; + int gpio = ~0; + + if(!no_release_workaround) + return; + + DO_AR5315(gpio = sysRegRead(AR5315_GPIO_DI);) + gpio &= 1 << (AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE); + if(gpio) + { + rst_button_timer.expires = jiffies + (HZ / 4); + add_timer(&rst_button_timer); + } else { + event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC); + if (!event) + { + printk("Could not alloc hotplug event\n"); + return; + } + event->set = 0; + event->jiffies = jiffies; + INIT_WORK(&event->wq, (void *)(void *)hotplug_button); + schedule_work(&event->wq); + } +} + +static irqreturn_t button_handler(int irq, void *dev_id) +{ + static int pressed = 0; + struct event_t *event; + u32 gpio = ~0; + + event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC); + if (!event) + return IRQ_NONE; + + pressed = !pressed; + + DO_AR5315(gpio = sysRegRead(AR5315_GPIO_DI);) + gpio &= 1 << (irq - AR531X_GPIO_IRQ_BASE); + + event->set = gpio; + if(!event->set) + no_release_workaround = 0; + + event->jiffies = jiffies; + + INIT_WORK(&event->wq, (void *)(void *)hotplug_button); + schedule_work(&event->wq); + + seen = jiffies; + if(event->set && no_release_workaround) + mod_timer(&rst_button_timer, jiffies + (HZ / 4)); + + return IRQ_HANDLED; +} + +void ar531x_disable_reset_button(void) +{ + disable_irq(AR531X_RESET_GPIO_IRQ); +} + +EXPORT_SYMBOL(ar531x_disable_reset_button); + +int __init ar531x_init_reset(void) +{ + bcfg = (struct ar531x_boarddata *) board_config; + + seen = jiffies; + + init_timer(&rst_button_timer); + rst_button_timer.function = reset_button_poll; + rst_button_timer.expires = jiffies + HZ / 50; + add_timer(&rst_button_timer); + + request_irq(AR531X_RESET_GPIO_IRQ, &button_handler, IRQF_SAMPLE_RANDOM, "ar531x_reset", NULL); + + return 0; +} + + + +module_init(ar531x_init_reset); |