diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c | 157 |
1 files changed, 140 insertions, 17 deletions
diff --git a/target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c b/target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c index 6ac9ec6b17..3d0e8036cb 100644 --- a/target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c +++ b/target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c @@ -24,6 +24,16 @@ #include <linux/proc_fs.h> #include <linux/init.h> #include <linux/ioctl.h> +#include <linux/timer.h> +#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 <asm/semaphore.h> #include <asm/uaccess.h> #include <asm/ifxmips/ifxmips.h> @@ -34,6 +44,24 @@ static unsigned int ifxmips_gpio_major = 0; +#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN +#define IFXMIPS_RST_PIN 15 +#define IFXMIPS_RST_PORT 1 + +static struct timer_list rst_button_timer; + +extern struct sock *uevent_sock; +extern u64 uevent_next_seqnum(void); +static unsigned long seen; +static int pressed = 0; + +struct event_t { + struct work_struct wq; + int set; + unsigned long jiffies; +}; +#endif + /* TODO do we need this ? */ static struct semaphore port_sem; @@ -64,7 +92,7 @@ int ifxmips_port_set_open_drain (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OD); + writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC)); return 0; } @@ -74,7 +102,7 @@ int ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD); + writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC)); return 0; } @@ -84,7 +112,7 @@ int ifxmips_port_set_pudsel (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL); + writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)); return 0; } @@ -94,7 +122,7 @@ int ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL); + writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)); return 0; } @@ -104,7 +132,7 @@ int ifxmips_port_set_puden (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN); + writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)); return 0; } @@ -114,7 +142,7 @@ int ifxmips_port_clear_puden (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN); + writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)); return 0; } @@ -124,7 +152,7 @@ int ifxmips_port_set_stoff (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF); + writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC)); return 0; } @@ -134,7 +162,7 @@ int ifxmips_port_clear_stoff (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF); + writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC)); return 0; } @@ -144,7 +172,7 @@ int ifxmips_port_set_dir_out (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_DIR); + writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC)); return 0; } @@ -154,7 +182,7 @@ int ifxmips_port_set_dir_in (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR); + writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC)); return 0; } @@ -164,7 +192,7 @@ int ifxmips_port_set_output (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OUT); + writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC)); return 0; } @@ -174,7 +202,7 @@ int ifxmips_port_clear_output (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT); + writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC)); return 0; } @@ -185,7 +213,7 @@ ifxmips_port_get_input (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - if (readl(IFXMIPS_GPIO_P0_IN + (port * 0x30)) & (1 << pin)) + if (readl(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin)) return 0; else return 1; @@ -196,7 +224,7 @@ int ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0); + writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)); return 0; } @@ -206,7 +234,7 @@ int ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0); + writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)); return 0; } @@ -216,7 +244,7 @@ int ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1); + writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)); return 0; } @@ -226,12 +254,90 @@ int ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin) { IFXMIPS_GPIO_SANITY; - writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1); + writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)); return 0; } EXPORT_SYMBOL(ifxmips_port_clear_altsel1); +#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN +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 void reset_button_poll(unsigned long unused) +{ + struct event_t *event; + + rst_button_timer.expires = jiffies + HZ; + add_timer(&rst_button_timer); + + if (pressed != ifxmips_port_get_input(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN)) + { + if(pressed) + pressed = 0; + else + pressed = 1; + printk("button was %s\n", (pressed ? "pressed" : "released")); + event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC); + if (!event) + { + printk("Could not alloc hotplug event\n"); + return; + } + event->set = pressed; + event->jiffies = jiffies; + INIT_WORK(&event->wq, (void *)(void *)hotplug_button); + schedule_work(&event->wq); + seen = jiffies; + } +} +#endif + long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf) { u32 reg, bit = 0; @@ -425,6 +531,20 @@ ifxmips_gpio_init (void) create_proc_read_entry("ifxmips_gpio", 0, NULL, ifxmips_port_read_procmem, NULL); +#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN + ifxmips_port_set_open_drain(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN); + ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN); + ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN); + ifxmips_port_set_dir_in(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN); + + seen = jiffies; + + init_timer(&rst_button_timer); + rst_button_timer.function = reset_button_poll; + rst_button_timer.expires = jiffies + HZ; + add_timer(&rst_button_timer); +#endif + printk("registered ifxmips gpio driver\n"); out: @@ -434,6 +554,9 @@ out: void __exit ifxmips_gpio_exit (void) { +#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN + del_timer_sync(&rst_button_timer); +#endif unregister_chrdev(ifxmips_gpio_major, "ifxmips_gpio"); remove_proc_entry("ifxmips_gpio", NULL); } |