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-rw-r--r--target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c157
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);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 12:57:50 +0000