mirror of https://gitee.com/openkylin/linux.git
watchdog: bcm47xx_wdt.c: convert to watchdog core api
Convert the bcm47xx_wdt.c driver to the new watchdog core api. The nowayout parameter is now added unconditionally to the module. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Hauke Mehrtens
Wim Van Sebroeck
parent
52e5cc4efa
commit
5434a04db9
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@ -997,6 +997,7 @@ config ATH79_WDT
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config BCM47XX_WDT
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tristate "Broadcom BCM47xx Watchdog Timer"
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depends on BCM47XX
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select WATCHDOG_CORE
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help
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Hardware driver for the Broadcom BCM47xx Watchdog Timer.
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@ -14,15 +14,12 @@
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/reboot.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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@ -41,15 +38,11 @@ module_param(wdt_time, int, 0);
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MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
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__MODULE_STRING(WDT_DEFAULT_TIME) ")");
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#ifdef CONFIG_WATCHDOG_NOWAYOUT
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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#endif
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static unsigned long bcm47xx_wdt_busy;
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static char expect_release;
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static struct timer_list wdt_timer;
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static atomic_t ticks;
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@ -97,29 +90,31 @@ static void bcm47xx_timer_tick(unsigned long unused)
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}
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}
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static inline void bcm47xx_wdt_pet(void)
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static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd)
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{
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atomic_set(&ticks, wdt_time);
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return 0;
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}
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static void bcm47xx_wdt_start(void)
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static int bcm47xx_wdt_start(struct watchdog_device *wdd)
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{
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bcm47xx_wdt_pet();
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bcm47xx_timer_tick(0);
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return 0;
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}
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static void bcm47xx_wdt_pause(void)
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static int bcm47xx_wdt_stop(struct watchdog_device *wdd)
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{
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del_timer_sync(&wdt_timer);
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bcm47xx_wdt_hw_stop();
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return 0;
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}
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static void bcm47xx_wdt_stop(void)
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{
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bcm47xx_wdt_pause();
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}
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static int bcm47xx_wdt_settimeout(int new_time)
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static int bcm47xx_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int new_time)
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{
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if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
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return -EINVAL;
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@ -128,51 +123,6 @@ static int bcm47xx_wdt_settimeout(int new_time)
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return 0;
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}
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static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &bcm47xx_wdt_busy))
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return -EBUSY;
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bcm47xx_wdt_start();
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return nonseekable_open(inode, file);
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}
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static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
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{
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if (expect_release == 42) {
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bcm47xx_wdt_stop();
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} else {
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pr_crit("Unexpected close, not stopping watchdog!\n");
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bcm47xx_wdt_start();
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}
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clear_bit(0, &bcm47xx_wdt_busy);
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expect_release = 0;
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return 0;
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}
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static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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expect_release = 0;
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_release = 42;
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}
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}
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bcm47xx_wdt_pet();
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}
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return len;
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}
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static const struct watchdog_info bcm47xx_wdt_info = {
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.identity = DRV_NAME,
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.options = WDIOF_SETTIMEOUT |
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@ -180,80 +130,25 @@ static const struct watchdog_info bcm47xx_wdt_info = {
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WDIOF_MAGICCLOSE,
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};
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static long bcm47xx_wdt_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_value, retval = -EINVAL;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &bcm47xx_wdt_info,
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sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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if (get_user(new_value, p))
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return -EFAULT;
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if (new_value & WDIOS_DISABLECARD) {
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bcm47xx_wdt_stop();
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retval = 0;
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}
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if (new_value & WDIOS_ENABLECARD) {
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bcm47xx_wdt_start();
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retval = 0;
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}
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return retval;
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case WDIOC_KEEPALIVE:
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bcm47xx_wdt_pet();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_value, p))
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return -EFAULT;
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if (bcm47xx_wdt_settimeout(new_value))
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return -EINVAL;
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bcm47xx_wdt_pet();
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case WDIOC_GETTIMEOUT:
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return put_user(wdt_time, p);
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default:
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return -ENOTTY;
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}
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}
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static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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unsigned long code, void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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bcm47xx_wdt_stop();
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return NOTIFY_DONE;
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}
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static const struct file_operations bcm47xx_wdt_fops = {
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static struct watchdog_ops bcm47xx_wdt_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.unlocked_ioctl = bcm47xx_wdt_ioctl,
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.open = bcm47xx_wdt_open,
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.release = bcm47xx_wdt_release,
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.write = bcm47xx_wdt_write,
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.start = bcm47xx_wdt_start,
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.stop = bcm47xx_wdt_stop,
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.ping = bcm47xx_wdt_keepalive,
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.set_timeout = bcm47xx_wdt_set_timeout,
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};
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static struct miscdevice bcm47xx_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &bcm47xx_wdt_fops,
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static struct watchdog_device bcm47xx_wdt_wdd = {
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.info = &bcm47xx_wdt_info,
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.ops = &bcm47xx_wdt_ops,
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};
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static struct notifier_block bcm47xx_wdt_notifier = {
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@ -274,12 +169,13 @@ static int __init bcm47xx_wdt_init(void)
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pr_info("wdt_time value must be 0 < wdt_time < %d, using %d\n",
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(WDT_MAX_TIME + 1), wdt_time);
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}
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watchdog_set_nowayout(&bcm47xx_wdt_wdd, nowayout);
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ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
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if (ret)
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return ret;
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ret = misc_register(&bcm47xx_wdt_miscdev);
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ret = watchdog_register_device(&bcm47xx_wdt_wdd);
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if (ret) {
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unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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return ret;
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@ -292,10 +188,7 @@ static int __init bcm47xx_wdt_init(void)
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static void __exit bcm47xx_wdt_exit(void)
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{
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if (!nowayout)
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bcm47xx_wdt_stop();
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misc_deregister(&bcm47xx_wdt_miscdev);
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watchdog_unregister_device(&bcm47xx_wdt_wdd);
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unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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}
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@ -306,4 +199,3 @@ module_exit(bcm47xx_wdt_exit);
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MODULE_AUTHOR("Aleksandar Radovanovic");
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MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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