diff options
| -rw-r--r-- | drivers/watchdog/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/watchdog/wm8350_wdt.c | 216 |
2 files changed, 38 insertions, 179 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index d5531fb46325..debbdb739d75 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -74,6 +74,7 @@ config WM831X_WATCHDOG config WM8350_WATCHDOG tristate "WM8350 watchdog" depends on MFD_WM8350 + select WATCHDOG_CORE help Support for the watchdog in the WM8350 AudioPlus PMIC. When the watchdog triggers the system will be reset. diff --git a/drivers/watchdog/wm8350_wdt.c b/drivers/watchdog/wm8350_wdt.c index cdd2efc6d6b1..0ce572c15659 100644 --- a/drivers/watchdog/wm8350_wdt.c +++ b/drivers/watchdog/wm8350_wdt.c @@ -14,8 +14,6 @@ #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> #include <linux/platform_device.h> #include <linux/watchdog.h> #include <linux/uaccess.h> @@ -27,36 +25,36 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); -static unsigned long wm8350_wdt_users; -static struct miscdevice wm8350_wdt_miscdev; -static int wm8350_wdt_expect_close; static DEFINE_MUTEX(wdt_mutex); static struct { - int time; /* Seconds */ - u16 val; /* To be set in WM8350_SYSTEM_CONTROL_2 */ + unsigned int time; /* Seconds */ + u16 val; /* To be set in WM8350_SYSTEM_CONTROL_2 */ } wm8350_wdt_cfgs[] = { { 1, 0x02 }, { 2, 0x04 }, { 4, 0x05 }, }; -static struct wm8350 *get_wm8350(void) +static int wm8350_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int timeout) { - return dev_get_drvdata(wm8350_wdt_miscdev.parent); -} - -static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value) -{ - int ret; + struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); + int ret, i; u16 reg; + for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++) + if (wm8350_wdt_cfgs[i].time == timeout) + break; + if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) + return -EINVAL; + mutex_lock(&wdt_mutex); wm8350_reg_unlock(wm8350); reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); reg &= ~WM8350_WDOG_TO_MASK; - reg |= value; + reg |= wm8350_wdt_cfgs[i].val; ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg); wm8350_reg_lock(wm8350); @@ -65,8 +63,9 @@ static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value) return ret; } -static int wm8350_wdt_start(struct wm8350 *wm8350) +static int wm8350_wdt_start(struct watchdog_device *wdt_dev) { + struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; @@ -84,8 +83,9 @@ static int wm8350_wdt_start(struct wm8350 *wm8350) return ret; } -static int wm8350_wdt_stop(struct wm8350 *wm8350) +static int wm8350_wdt_stop(struct watchdog_device *wdt_dev) { + struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; @@ -102,8 +102,9 @@ static int wm8350_wdt_stop(struct wm8350 *wm8350) return ret; } -static int wm8350_wdt_kick(struct wm8350 *wm8350) +static int wm8350_wdt_ping(struct watchdog_device *wdt_dev) { + struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; @@ -117,168 +118,25 @@ static int wm8350_wdt_kick(struct wm8350 *wm8350) return ret; } -static int wm8350_wdt_open(struct inode *inode, struct file *file) -{ - struct wm8350 *wm8350 = get_wm8350(); - int ret; - - if (!wm8350) - return -ENODEV; - - if (test_and_set_bit(0, &wm8350_wdt_users)) - return -EBUSY; - - ret = wm8350_wdt_start(wm8350); - if (ret != 0) - return ret; - - return nonseekable_open(inode, file); -} - -static int wm8350_wdt_release(struct inode *inode, struct file *file) -{ - struct wm8350 *wm8350 = get_wm8350(); - - if (wm8350_wdt_expect_close) - wm8350_wdt_stop(wm8350); - else { - dev_warn(wm8350->dev, "Watchdog device closed uncleanly\n"); - wm8350_wdt_kick(wm8350); - } - - clear_bit(0, &wm8350_wdt_users); - - return 0; -} - -static ssize_t wm8350_wdt_write(struct file *file, - const char __user *data, size_t count, - loff_t *ppos) -{ - struct wm8350 *wm8350 = get_wm8350(); - size_t i; - - if (count) { - wm8350_wdt_kick(wm8350); - - if (!nowayout) { - /* In case it was set long ago */ - wm8350_wdt_expect_close = 0; - - /* scan to see whether or not we got the magic - character */ - for (i = 0; i != count; i++) { - char c; - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - wm8350_wdt_expect_close = 42; - } - } - } - return count; -} - -static const struct watchdog_info ident = { +static const struct watchdog_info wm8350_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "WM8350 Watchdog", }; -static long wm8350_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - struct wm8350 *wm8350 = get_wm8350(); - int ret = -ENOTTY, time, i; - void __user *argp = (void __user *)arg; - int __user *p = argp; - u16 reg; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - ret = put_user(0, p); - break; - - case WDIOC_SETOPTIONS: - { - int options; - - if (get_user(options, p)) - return -EFAULT; - - ret = -EINVAL; - - /* Setting both simultaneously means at least one must fail */ - if (options == WDIOS_DISABLECARD) - ret = wm8350_wdt_stop(wm8350); - - if (options == WDIOS_ENABLECARD) - ret = wm8350_wdt_start(wm8350); - break; - } - - case WDIOC_KEEPALIVE: - ret = wm8350_wdt_kick(wm8350); - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, p); - if (ret) - break; - - if (time == 0) { - if (nowayout) - ret = -EINVAL; - else - wm8350_wdt_stop(wm8350); - break; - } - - for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++) - if (wm8350_wdt_cfgs[i].time == time) - break; - if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) - ret = -EINVAL; - else - ret = wm8350_wdt_set_timeout(wm8350, - wm8350_wdt_cfgs[i].val); - break; - - case WDIOC_GETTIMEOUT: - reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); - reg &= WM8350_WDOG_TO_MASK; - for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++) - if (wm8350_wdt_cfgs[i].val == reg) - break; - if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) { - dev_warn(wm8350->dev, - "Unknown watchdog configuration: %x\n", reg); - ret = -EINVAL; - } else - ret = put_user(wm8350_wdt_cfgs[i].time, p); - - } - - return ret; -} - -static const struct file_operations wm8350_wdt_fops = { +static const struct watchdog_ops wm8350_wdt_ops = { .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wm8350_wdt_write, - .unlocked_ioctl = wm8350_wdt_ioctl, - .open = wm8350_wdt_open, - .release = wm8350_wdt_release, + .start = wm8350_wdt_start, + .stop = wm8350_wdt_stop, + .ping = wm8350_wdt_ping, + .set_timeout = wm8350_wdt_set_timeout, }; -static struct miscdevice wm8350_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wm8350_wdt_fops, +static struct watchdog_device wm8350_wdt = { + .info = &wm8350_wdt_info, + .ops = &wm8350_wdt_ops, + .timeout = 4, + .min_timeout = 1, + .max_timeout = 4, }; static int __devinit wm8350_wdt_probe(struct platform_device *pdev) @@ -290,18 +148,18 @@ static int __devinit wm8350_wdt_probe(struct platform_device *pdev) return -ENODEV; } - /* Default to 4s timeout */ - wm8350_wdt_set_timeout(wm8350, 0x05); + watchdog_set_nowayout(&wm8350_wdt, nowayout); + watchdog_set_drvdata(&wm8350_wdt, wm8350); - wm8350_wdt_miscdev.parent = &pdev->dev; + /* Default to 4s timeout */ + wm8350_wdt_set_timeout(&wm8350_wdt, 4); - return misc_register(&wm8350_wdt_miscdev); + return watchdog_register_device(&wm8350_wdt); } static int __devexit wm8350_wdt_remove(struct platform_device *pdev) { - misc_deregister(&wm8350_wdt_miscdev); - + watchdog_unregister_device(&wm8350_wdt); return 0; } |