watchdog: Convert max63xx_wdt driver to watchdog framework
This patch converts max63xx_wdt driver to watchdog framework. Also use devm_* APIs to save a few error handling code. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Axel Lin
Wim Van Sebroeck
parent
6b1e83869d
commit
a0f3683365
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@ -330,6 +330,7 @@ config TS72XX_WATCHDOG
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config MAX63XX_WATCHDOG
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tristate "Max63xx watchdog"
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depends on ARM && HAS_IOMEM
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select WATCHDOG_CORE
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help
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Support for memory mapped max63{69,70,71,72,73,74} watchdog timer.
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@ -18,22 +18,19 @@
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#define DEFAULT_HEARTBEAT 60
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#define MAX_HEARTBEAT 60
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static int heartbeat = DEFAULT_HEARTBEAT;
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static unsigned int heartbeat = DEFAULT_HEARTBEAT;
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static bool nowayout = WATCHDOG_NOWAYOUT;
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/*
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@ -45,15 +42,8 @@ static bool nowayout = WATCHDOG_NOWAYOUT;
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static DEFINE_SPINLOCK(io_lock);
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static unsigned long wdt_status;
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#define WDT_IN_USE 0
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#define WDT_RUNNING 1
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#define WDT_OK_TO_CLOSE 2
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static int nodelay;
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static struct resource *wdt_mem;
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static void __iomem *wdt_base;
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static struct platform_device *max63xx_pdev;
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/*
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* The timeout values used are actually the absolute minimum the chip
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@ -117,7 +107,7 @@ max63xx_select_timeout(struct max63xx_timeout *table, int value)
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return NULL;
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}
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static void max63xx_wdt_ping(void)
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static int max63xx_wdt_ping(struct watchdog_device *wdd)
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{
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u8 val;
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@ -129,15 +119,14 @@ static void max63xx_wdt_ping(void)
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__raw_writeb(val & ~MAX6369_WDI, wdt_base);
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spin_unlock(&io_lock);
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return 0;
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}
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static void max63xx_wdt_enable(struct max63xx_timeout *entry)
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static int max63xx_wdt_start(struct watchdog_device *wdd)
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{
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struct max63xx_timeout *entry = watchdog_get_drvdata(wdd);
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u8 val;
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if (test_and_set_bit(WDT_RUNNING, &wdt_status))
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return;
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spin_lock(&io_lock);
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val = __raw_readb(wdt_base);
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@ -149,10 +138,11 @@ static void max63xx_wdt_enable(struct max63xx_timeout *entry)
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/* check for a edge triggered startup */
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if (entry->tdelay == 0)
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max63xx_wdt_ping();
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max63xx_wdt_ping(wdd);
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return 0;
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}
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static void max63xx_wdt_disable(void)
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static int max63xx_wdt_stop(struct watchdog_device *wdd)
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{
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u8 val;
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@ -164,113 +154,29 @@ static void max63xx_wdt_disable(void)
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__raw_writeb(val, wdt_base);
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spin_unlock(&io_lock);
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clear_bit(WDT_RUNNING, &wdt_status);
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}
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static int max63xx_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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max63xx_wdt_enable(current_timeout);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return nonseekable_open(inode, file);
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}
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static ssize_t max63xx_wdt_write(struct file *file, const char *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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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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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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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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}
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max63xx_wdt_ping();
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}
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return len;
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}
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static const struct watchdog_info ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
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.identity = "max63xx Watchdog",
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};
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static long max63xx_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -ENOTTY;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_KEEPALIVE:
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max63xx_wdt_ping();
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ret = 0;
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break;
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case WDIOC_GETTIMEOUT:
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ret = put_user(heartbeat, (int *)arg);
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break;
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}
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return ret;
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}
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static int max63xx_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
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max63xx_wdt_disable();
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else
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dev_crit(&max63xx_pdev->dev,
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"device closed unexpectedly - timer will not stop\n");
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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static const struct file_operations max63xx_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = max63xx_wdt_write,
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.unlocked_ioctl = max63xx_wdt_ioctl,
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.open = max63xx_wdt_open,
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.release = max63xx_wdt_release,
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static const struct watchdog_info max63xx_wdt_info = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "max63xx Watchdog",
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};
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static struct miscdevice max63xx_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &max63xx_wdt_fops,
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static const struct watchdog_ops max63xx_wdt_ops = {
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.owner = THIS_MODULE,
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.start = max63xx_wdt_start,
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.stop = max63xx_wdt_stop,
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.ping = max63xx_wdt_ping,
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};
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static struct watchdog_device max63xx_wdt_dev = {
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.info = &max63xx_wdt_info,
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.ops = &max63xx_wdt_ops,
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};
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static int __devinit max63xx_wdt_probe(struct platform_device *pdev)
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{
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int ret = 0;
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int size;
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struct device *dev = &pdev->dev;
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struct resource *wdt_mem;
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struct max63xx_timeout *table;
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table = (struct max63xx_timeout *)pdev->id_entry->driver_data;
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@ -278,68 +184,34 @@ static int __devinit max63xx_wdt_probe(struct platform_device *pdev)
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if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
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heartbeat = DEFAULT_HEARTBEAT;
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dev_info(dev, "requesting %ds heartbeat\n", heartbeat);
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dev_info(&pdev->dev, "requesting %ds heartbeat\n", heartbeat);
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current_timeout = max63xx_select_timeout(table, heartbeat);
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if (!current_timeout) {
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dev_err(dev, "unable to satisfy heartbeat request\n");
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dev_err(&pdev->dev, "unable to satisfy heartbeat request\n");
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return -EINVAL;
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}
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dev_info(dev, "using %ds heartbeat with %ds initial delay\n",
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dev_info(&pdev->dev, "using %ds heartbeat with %ds initial delay\n",
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current_timeout->twd, current_timeout->tdelay);
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heartbeat = current_timeout->twd;
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max63xx_pdev = pdev;
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wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (wdt_mem == NULL) {
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dev_err(dev, "failed to get memory region resource\n");
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return -ENOENT;
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}
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wdt_base = devm_request_and_ioremap(&pdev->dev, wdt_mem);
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if (!wdt_base)
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return -ENOMEM;
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size = resource_size(wdt_mem);
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if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
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dev_err(dev, "failed to get memory region\n");
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return -ENOENT;
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}
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max63xx_wdt_dev.timeout = heartbeat;
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watchdog_set_nowayout(&max63xx_wdt_dev, nowayout);
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watchdog_set_drvdata(&max63xx_wdt_dev, current_timeout);
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wdt_base = ioremap(wdt_mem->start, size);
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if (!wdt_base) {
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dev_err(dev, "failed to map memory region\n");
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ret = -ENOMEM;
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goto out_request;
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}
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ret = misc_register(&max63xx_wdt_miscdev);
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if (ret < 0) {
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dev_err(dev, "cannot register misc device\n");
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goto out_unmap;
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}
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return 0;
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out_unmap:
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iounmap(wdt_base);
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out_request:
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release_mem_region(wdt_mem->start, size);
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wdt_mem = NULL;
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return ret;
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return watchdog_register_device(&max63xx_wdt_dev);
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}
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static int __devexit max63xx_wdt_remove(struct platform_device *pdev)
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{
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misc_deregister(&max63xx_wdt_miscdev);
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if (wdt_mem) {
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release_mem_region(wdt_mem->start, resource_size(wdt_mem));
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wdt_mem = NULL;
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}
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if (wdt_base)
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iounmap(wdt_base);
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watchdog_unregister_device(&max63xx_wdt_dev);
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return 0;
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}
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