add gpio fixes and reset button supportÂ
SVN-Revision: 9904
This commit is contained in:
John Crispin
parent
72a622a193
commit
a09f80dfda
1 changed files with 140 additions and 17 deletions
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@ -24,6 +24,16 @@
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/timer.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/kobject.h>
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#include <linux/workqueue.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include <asm/ifxmips/ifxmips.h>
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@ -34,6 +44,24 @@
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static unsigned int ifxmips_gpio_major = 0;
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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#define IFXMIPS_RST_PIN 15
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#define IFXMIPS_RST_PORT 1
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static struct timer_list rst_button_timer;
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extern struct sock *uevent_sock;
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extern u64 uevent_next_seqnum(void);
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static unsigned long seen;
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static int pressed = 0;
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struct event_t {
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struct work_struct wq;
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int set;
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unsigned long jiffies;
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};
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#endif
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/* TODO do we need this ? */
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static struct semaphore port_sem;
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@ -64,7 +92,7 @@ int
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ifxmips_port_set_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OD);
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
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return 0;
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}
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@ -74,7 +102,7 @@ int
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ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD);
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
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return 0;
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}
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@ -84,7 +112,7 @@ int
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ifxmips_port_set_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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return 0;
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}
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@ -94,7 +122,7 @@ int
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ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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return 0;
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}
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@ -104,7 +132,7 @@ int
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ifxmips_port_set_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN);
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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return 0;
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}
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@ -114,7 +142,7 @@ int
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ifxmips_port_clear_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN);
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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return 0;
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}
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@ -124,7 +152,7 @@ int
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ifxmips_port_set_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF);
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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return 0;
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}
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@ -134,7 +162,7 @@ int
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ifxmips_port_clear_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF);
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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return 0;
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}
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@ -144,7 +172,7 @@ int
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ifxmips_port_set_dir_out (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_DIR);
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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return 0;
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}
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@ -154,7 +182,7 @@ int
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ifxmips_port_set_dir_in (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR);
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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return 0;
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}
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@ -164,7 +192,7 @@ int
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ifxmips_port_set_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OUT);
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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return 0;
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}
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@ -174,7 +202,7 @@ int
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ifxmips_port_clear_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT);
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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return 0;
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}
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@ -185,7 +213,7 @@ ifxmips_port_get_input (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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if (readl(IFXMIPS_GPIO_P0_IN + (port * 0x30)) & (1 << pin))
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if (readl(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
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return 0;
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else
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return 1;
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@ -196,7 +224,7 @@ int
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ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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return 0;
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}
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@ -206,7 +234,7 @@ int
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ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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return 0;
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}
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@ -216,7 +244,7 @@ int
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ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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return 0;
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}
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@ -226,12 +254,90 @@ int
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ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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static inline void add_msg(struct sk_buff *skb, char *msg)
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{
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char *scratch;
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scratch = skb_put(skb, strlen(msg) + 1);
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sprintf(scratch, msg);
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}
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static void hotplug_button(struct work_struct *wq)
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{
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struct sk_buff *skb;
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struct event_t *event;
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size_t len;
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char *scratch, *s;
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char buf[128];
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event = container_of(wq, struct event_t, wq);
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if (!uevent_sock)
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goto done;
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/* allocate message with the maximum possible size */
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s = event->set ? "pressed" : "released";
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len = strlen(s) + 2;
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skb = alloc_skb(len + 2048, GFP_KERNEL);
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if (!skb)
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goto done;
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/* add header */
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scratch = skb_put(skb, len);
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sprintf(scratch, "%s@",s);
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/* copy keys to our continuous event payload buffer */
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add_msg(skb, "HOME=/");
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add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
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add_msg(skb, "SUBSYSTEM=button");
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add_msg(skb, "BUTTON=reset");
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add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
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sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
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add_msg(skb, buf);
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snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
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add_msg(skb, buf);
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NETLINK_CB(skb).dst_group = 1;
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netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
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done:
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kfree(event);
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}
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static void reset_button_poll(unsigned long unused)
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{
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struct event_t *event;
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rst_button_timer.expires = jiffies + HZ;
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add_timer(&rst_button_timer);
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if (pressed != ifxmips_port_get_input(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN))
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{
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if(pressed)
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pressed = 0;
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else
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pressed = 1;
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printk("button was %s\n", (pressed ? "pressed" : "released"));
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event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
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if (!event)
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{
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printk("Could not alloc hotplug event\n");
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return;
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}
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event->set = pressed;
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event->jiffies = jiffies;
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INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
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schedule_work(&event->wq);
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seen = jiffies;
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}
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}
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#endif
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long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf)
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{
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u32 reg, bit = 0;
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@ -425,6 +531,20 @@ ifxmips_gpio_init (void)
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create_proc_read_entry("ifxmips_gpio", 0, NULL,
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ifxmips_port_read_procmem, NULL);
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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ifxmips_port_set_open_drain(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
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ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
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ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
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ifxmips_port_set_dir_in(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
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seen = jiffies;
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init_timer(&rst_button_timer);
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rst_button_timer.function = reset_button_poll;
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rst_button_timer.expires = jiffies + HZ;
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add_timer(&rst_button_timer);
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#endif
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printk("registered ifxmips gpio driver\n");
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out:
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@ -434,6 +554,9 @@ out:
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void __exit
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ifxmips_gpio_exit (void)
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{
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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del_timer_sync(&rst_button_timer);
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#endif
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unregister_chrdev(ifxmips_gpio_major, "ifxmips_gpio");
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remove_proc_entry("ifxmips_gpio", NULL);
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}
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