diff options
| -rw-r--r-- | drivers/watchdog/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/watchdog/wm831x_wdt.c | 318 |
2 files changed, 106 insertions, 213 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 40a36c50a5f4..6285867a9356 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -66,6 +66,7 @@ config SOFT_WATCHDOG config WM831X_WATCHDOG tristate "WM831x watchdog" depends on MFD_WM831X + select WATCHDOG_CORE help Support for the watchdog in the WM831x AudioPlus PMICs. When the watchdog triggers the system will be reset. diff --git a/drivers/watchdog/wm831x_wdt.c b/drivers/watchdog/wm831x_wdt.c index 871caea4e1c6..7be38556aed0 100644 --- a/drivers/watchdog/wm831x_wdt.c +++ b/drivers/watchdog/wm831x_wdt.c @@ -12,8 +12,7 @@ #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> +#include <linux/slab.h> #include <linux/platform_device.h> #include <linux/watchdog.h> #include <linux/uaccess.h> @@ -29,19 +28,19 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); -static unsigned long wm831x_wdt_users; -static struct miscdevice wm831x_wdt_miscdev; -static int wm831x_wdt_expect_close; -static DEFINE_MUTEX(wdt_mutex); -static struct wm831x *wm831x; -static unsigned int update_gpio; -static unsigned int update_state; +struct wm831x_wdt_drvdata { + struct watchdog_device wdt; + struct wm831x *wm831x; + struct mutex lock; + int update_gpio; + int update_state; +}; /* We can't use the sub-second values here but they're included * for completeness. */ static struct { - int time; /* Seconds */ - u16 val; /* WDOG_TO value */ + unsigned int time; /* Seconds */ + u16 val; /* WDOG_TO value */ } wm831x_wdt_cfgs[] = { { 1, 2 }, { 2, 3 }, @@ -52,32 +51,13 @@ static struct { { 33, 7 }, /* Actually 32.768s so include both, others round down */ }; -static int wm831x_wdt_set_timeout(struct wm831x *wm831x, u16 value) -{ - int ret; - - mutex_lock(&wdt_mutex); - - ret = wm831x_reg_unlock(wm831x); - if (ret == 0) { - ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG, - WM831X_WDOG_TO_MASK, value); - wm831x_reg_lock(wm831x); - } else { - dev_err(wm831x->dev, "Failed to unlock security key: %d\n", - ret); - } - - mutex_unlock(&wdt_mutex); - - return ret; -} - -static int wm831x_wdt_start(struct wm831x *wm831x) +static int wm831x_wdt_start(struct watchdog_device *wdt_dev) { + struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev); + struct wm831x *wm831x = driver_data->wm831x; int ret; - mutex_lock(&wdt_mutex); + mutex_lock(&driver_data->lock); ret = wm831x_reg_unlock(wm831x); if (ret == 0) { @@ -89,16 +69,18 @@ static int wm831x_wdt_start(struct wm831x *wm831x) ret); } - mutex_unlock(&wdt_mutex); + mutex_unlock(&driver_data->lock); return ret; } -static int wm831x_wdt_stop(struct wm831x *wm831x) +static int wm831x_wdt_stop(struct watchdog_device *wdt_dev) { + struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev); + struct wm831x *wm831x = driver_data->wm831x; int ret; - mutex_lock(&wdt_mutex); + mutex_lock(&driver_data->lock); ret = wm831x_reg_unlock(wm831x); if (ret == 0) { @@ -110,26 +92,28 @@ static int wm831x_wdt_stop(struct wm831x *wm831x) ret); } - mutex_unlock(&wdt_mutex); + mutex_unlock(&driver_data->lock); return ret; } -static int wm831x_wdt_kick(struct wm831x *wm831x) +static int wm831x_wdt_ping(struct watchdog_device *wdt_dev) { + struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev); + struct wm831x *wm831x = driver_data->wm831x; int ret; u16 reg; - mutex_lock(&wdt_mutex); + mutex_lock(&driver_data->lock); - if (update_gpio) { - gpio_set_value_cansleep(update_gpio, update_state); - update_state = !update_state; + if (driver_data->update_gpio) { + gpio_set_value_cansleep(driver_data->update_gpio, + driver_data->update_state); + driver_data->update_state = !driver_data->update_state; ret = 0; goto out; } - reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG); if (!(reg & WM831X_WDOG_RST_SRC)) { @@ -150,182 +134,59 @@ static int wm831x_wdt_kick(struct wm831x *wm831x) } out: - mutex_unlock(&wdt_mutex); + mutex_unlock(&driver_data->lock); return ret; } -static int wm831x_wdt_open(struct inode *inode, struct file *file) +static int wm831x_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int timeout) { - int ret; - - if (!wm831x) - return -ENODEV; - - if (test_and_set_bit(0, &wm831x_wdt_users)) - return -EBUSY; + struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev); + struct wm831x *wm831x = driver_data->wm831x; + int ret, i; - ret = wm831x_wdt_start(wm831x); - if (ret != 0) - return ret; - - return nonseekable_open(inode, file); -} + for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++) + if (wm831x_wdt_cfgs[i].time == timeout) + break; + if (i == ARRAY_SIZE(wm831x_wdt_cfgs)) + ret = -EINVAL; -static int wm831x_wdt_release(struct inode *inode, struct file *file) -{ - if (wm831x_wdt_expect_close) - wm831x_wdt_stop(wm831x); - else { - dev_warn(wm831x->dev, "Watchdog device closed uncleanly\n"); - wm831x_wdt_kick(wm831x); + ret = wm831x_reg_unlock(wm831x); + if (ret == 0) { + ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG, + WM831X_WDOG_TO_MASK, + wm831x_wdt_cfgs[i].val); + wm831x_reg_lock(wm831x); + } else { + dev_err(wm831x->dev, "Failed to unlock security key: %d\n", + ret); } - clear_bit(0, &wm831x_wdt_users); - - return 0; -} - -static ssize_t wm831x_wdt_write(struct file *file, - const char __user *data, size_t count, - loff_t *ppos) -{ - size_t i; - - if (count) { - wm831x_wdt_kick(wm831x); - - if (!nowayout) { - /* In case it was set long ago */ - wm831x_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') - wm831x_wdt_expect_close = 42; - } - } - } - return count; + return ret; } -static const struct watchdog_info ident = { +static const struct watchdog_info wm831x_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "WM831x Watchdog", }; -static long wm831x_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - 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 = wm831x_wdt_start(wm831x); - - if (options == WDIOS_ENABLECARD) - ret = wm831x_wdt_stop(wm831x); - break; - } - - case WDIOC_KEEPALIVE: - ret = wm831x_wdt_kick(wm831x); - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, p); - if (ret) - break; - - if (time == 0) { - if (nowayout) - ret = -EINVAL; - else - wm831x_wdt_stop(wm831x); - break; - } - - for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++) - if (wm831x_wdt_cfgs[i].time == time) - break; - if (i == ARRAY_SIZE(wm831x_wdt_cfgs)) - ret = -EINVAL; - else - ret = wm831x_wdt_set_timeout(wm831x, - wm831x_wdt_cfgs[i].val); - break; - - case WDIOC_GETTIMEOUT: - reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG); - reg &= WM831X_WDOG_TO_MASK; - for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++) - if (wm831x_wdt_cfgs[i].val == reg) - break; - if (i == ARRAY_SIZE(wm831x_wdt_cfgs)) { - dev_warn(wm831x->dev, - "Unknown watchdog configuration: %x\n", reg); - ret = -EINVAL; - } else - ret = put_user(wm831x_wdt_cfgs[i].time, p); - - } - - return ret; -} - -static const struct file_operations wm831x_wdt_fops = { +static const struct watchdog_ops wm831x_wdt_ops = { .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wm831x_wdt_write, - .unlocked_ioctl = wm831x_wdt_ioctl, - .open = wm831x_wdt_open, - .release = wm831x_wdt_release, -}; - -static struct miscdevice wm831x_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wm831x_wdt_fops, + .start = wm831x_wdt_start, + .stop = wm831x_wdt_stop, + .ping = wm831x_wdt_ping, + .set_timeout = wm831x_wdt_set_timeout, }; static int __devinit wm831x_wdt_probe(struct platform_device *pdev) { + struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *chip_pdata; struct wm831x_watchdog_pdata *pdata; - int reg, ret; - - if (wm831x) { - dev_err(&pdev->dev, "wm831x watchdog already registered\n"); - return -EBUSY; - } - - wm831x = dev_get_drvdata(pdev->dev.parent); + struct wm831x_wdt_drvdata *driver_data; + struct watchdog_device *wm831x_wdt; + int reg, ret, i; ret = wm831x_reg_read(wm831x, WM831X_WATCHDOG); if (ret < 0) { @@ -338,6 +199,36 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev) if (reg & WM831X_WDOG_DEBUG) dev_warn(wm831x->dev, "Watchdog is paused\n"); + driver_data = kzalloc(sizeof(*driver_data), GFP_KERNEL); + if (!driver_data) { + dev_err(wm831x->dev, "Unable to alloacate watchdog device\n"); + ret = -ENOMEM; + goto err; + } + + mutex_init(&driver_data->lock); + driver_data->wm831x = wm831x; + + wm831x_wdt = &driver_data->wdt; + + wm831x_wdt->info = &wm831x_wdt_info; + wm831x_wdt->ops = &wm831x_wdt_ops; + watchdog_set_drvdata(wm831x_wdt, driver_data); + + if (nowayout) + wm831x_wdt->status |= WDOG_NO_WAY_OUT; + + reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG); + reg &= WM831X_WDOG_TO_MASK; + for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++) + if (wm831x_wdt_cfgs[i].val == reg) + break; + if (i == ARRAY_SIZE(wm831x_wdt_cfgs)) + dev_warn(wm831x->dev, + "Unknown watchdog timeout: %x\n", reg); + else + wm831x_wdt->timeout = wm831x_wdt_cfgs[i].time; + /* Apply any configuration */ if (pdev->dev.parent->platform_data) { chip_pdata = pdev->dev.parent->platform_data; @@ -361,7 +252,7 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev) dev_err(wm831x->dev, "Failed to request update GPIO: %d\n", ret); - goto err; + goto err_alloc; } ret = gpio_direction_output(pdata->update_gpio, 0); @@ -372,7 +263,7 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev) goto err_gpio; } - update_gpio = pdata->update_gpio; + driver_data->update_gpio = pdata->update_gpio; /* Make sure the watchdog takes hardware updates */ reg |= WM831X_WDOG_RST_SRC; @@ -389,33 +280,34 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev) } } - wm831x_wdt_miscdev.parent = &pdev->dev; - - ret = misc_register(&wm831x_wdt_miscdev); + ret = watchdog_register_device(&driver_data->wdt); if (ret != 0) { - dev_err(wm831x->dev, "Failed to register miscdev: %d\n", ret); + dev_err(wm831x->dev, "watchdog_register_device() failed: %d\n", + ret); goto err_gpio; } + dev_set_drvdata(&pdev->dev, driver_data); + return 0; err_gpio: - if (update_gpio) { - gpio_free(update_gpio); - update_gpio = 0; - } + if (driver_data->update_gpio) + gpio_free(driver_data->update_gpio); +err_alloc: + kfree(driver_data); err: return ret; } static int __devexit wm831x_wdt_remove(struct platform_device *pdev) { - if (update_gpio) { - gpio_free(update_gpio); - update_gpio = 0; - } + struct wm831x_wdt_drvdata *driver_data = dev_get_drvdata(&pdev->dev); + + watchdog_unregister_device(&driver_data->wdt); - misc_deregister(&wm831x_wdt_miscdev); + if (driver_data->update_gpio) + gpio_free(driver_data->update_gpio); return 0; } |