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Subject[PATCH] rtc: ds1374: wdt: Use watchdog core for watchdog part
Date
Let ds1374 watchdog use watchdog core. It also includes
improving watchdog timer setting and nowayout, and just uses ioctl()
of watchdog core.

Signed-off-by: Johnson Chen <johnsonch.chen@moxa.com>
---
drivers/rtc/rtc-ds1374.c | 257 ++++++++++-----------------------------
1 file changed, 67 insertions(+), 190 deletions(-)

diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 9c51a12cf70f..25b28f7546ff 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* RTC client/driver for the Maxim/Dallas DS1374 Real-Time Clock over I2C
*
@@ -6,11 +7,7 @@
*
* Copyright (C) 2014 Rose Technology
* Copyright (C) 2006-2007 Freescale Semiconductor
- *
- * 2005 (c) MontaVista Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
+ * Copyright (C) 2005 (c) MontaVista Software, Inc.
*/
/*
* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
@@ -46,6 +43,7 @@
#define DS1374_REG_WDALM2 0x06
#define DS1374_REG_CR 0x07 /* Control */
#define DS1374_REG_CR_AIE 0x01 /* Alarm Int. Enable */
+#define DS1374_REG_CR_WDSTR 0x08 /* 1=INT, 0=RST */
#define DS1374_REG_CR_WDALM 0x20 /* 1=Watchdog, 0=Alarm */
#define DS1374_REG_CR_WACE 0x40 /* WD/Alarm counter enable */
#define DS1374_REG_SR 0x08 /* Status */
@@ -71,7 +69,9 @@ struct ds1374 {
struct i2c_client *client;
struct rtc_device *rtc;
struct work_struct work;
-
+#ifdef CONFIG_RTC_DRV_DS1374_WDT
+ struct watchdog_device wdt;
+#endif
/* The mutex protects alarm operations, and prevents a race
* between the enable_irq() in the workqueue and the free_irq()
* in the remove function.
@@ -257,7 +257,8 @@ static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
goto out;

/* Disable any existing alarm before setting the new one
- * (or lack thereof). */
+ * (or lack thereof).
+ */
cr &= ~DS1374_REG_CR_WACE;

ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
@@ -371,14 +372,21 @@ static const struct rtc_class_ops ds1374_rtc_ops = {
*/
static struct i2c_client *save_client;
/* Default margin */
-#define WD_TIMO 131762
+#define TIMER_MARGIN_DEFAULT 32
+#define TIMER_MARGIN_MIN 1
+#define TIMER_MARGIN_MAX (60*60*24) /* one day */

#define DRV_NAME "DS1374 Watchdog"

-static int wdt_margin = WD_TIMO;
-static unsigned long wdt_is_open;
-module_param(wdt_margin, int, 0);
-MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
+static int timeout = TIMER_MARGIN_DEFAULT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default 32s)");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default ="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT)")");
+

static const struct watchdog_info ds1374_wdt_info = {
.identity = "DS1374 WTD",
@@ -386,57 +394,61 @@ static const struct watchdog_info ds1374_wdt_info = {
WDIOF_MAGICCLOSE,
};

-static int ds1374_wdt_settimeout(unsigned int timeout)
+static int ds1374_wdt_settimeout(struct watchdog_device *wdt,
+ unsigned int timeout)
{
- int ret = -ENOIOCTLCMD;
- int cr;
+ int ret, cr;
+
+ wdt->timeout = timeout;

- ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
+ cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
+ ret = cr;
if (ret < 0)
- goto out;
+ return ret;

/* Disable any existing watchdog/alarm before setting the new one */
cr &= ~DS1374_REG_CR_WACE;

ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
if (ret < 0)
- goto out;
+ return ret;

/* Set new watchdog time */
+ timeout = timeout * 4096;
ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
if (ret) {
pr_info("couldn't set new watchdog time\n");
- goto out;
+ return ret;
}

/* Enable watchdog timer */
cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_WDALM;
+ cr &= ~DS1374_REG_CR_WDSTR;/* for RST PIN */
cr &= ~DS1374_REG_CR_AIE;

ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
if (ret < 0)
- goto out;
+ return ret;

return 0;
-out:
- return ret;
}

-
/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
-static void ds1374_wdt_ping(void)
+static int ds1374_wdt_ping(struct watchdog_device *wdt)
{
u32 val;
- int ret = 0;

- ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
- if (ret)
- pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
+ return ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
+}
+
+static int ds1374_wdt_start(struct watchdog_device *wdt)
+{
+ return ds1374_wdt_ping(wdt);
}

-static void ds1374_wdt_disable(void)
+static int ds1374_wdt_stop(struct watchdog_device *wdt)
{
int cr;

@@ -444,162 +456,17 @@ static void ds1374_wdt_disable(void)
/* Disable watchdog timer */
cr &= ~DS1374_REG_CR_WACE;

- i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
+ return i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
}

-/*
- * Watchdog device is opened, and watchdog starts running.
- */
-static int ds1374_wdt_open(struct inode *inode, struct file *file)
-{
- struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
-
- if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
- mutex_lock(&ds1374->mutex);
- if (test_and_set_bit(0, &wdt_is_open)) {
- mutex_unlock(&ds1374->mutex);
- return -EBUSY;
- }
- /*
- * Activate
- */
- wdt_is_open = 1;
- mutex_unlock(&ds1374->mutex);
- return stream_open(inode, file);
- }
- return -ENODEV;
-}
-
-/*
- * Close the watchdog device.
- */
-static int ds1374_wdt_release(struct inode *inode, struct file *file)
-{
- if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
- clear_bit(0, &wdt_is_open);
-
- return 0;
-}
-
-/*
- * Pat the watchdog whenever device is written to.
- */
-static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- if (len) {
- ds1374_wdt_ping();
- return 1;
- }
- return 0;
-}
-
-static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
- size_t len, loff_t *ppos)
-{
- return 0;
-}
-
-/*
- * Handle commands from user-space.
- */
-static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int new_margin, options;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user((struct watchdog_info __user *)arg,
- &ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, (int __user *)arg);
- case WDIOC_KEEPALIVE:
- ds1374_wdt_ping();
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, (int __user *)arg))
- return -EFAULT;
-
- /* the hardware's tick rate is 4096 Hz, so
- * the counter value needs to be scaled accordingly
- */
- new_margin <<= 12;
- if (new_margin < 1 || new_margin > 16777216)
- return -EINVAL;
-
- wdt_margin = new_margin;
- ds1374_wdt_settimeout(new_margin);
- ds1374_wdt_ping();
- /* fallthrough */
- case WDIOC_GETTIMEOUT:
- /* when returning ... inverse is true */
- return put_user((wdt_margin >> 12), (int __user *)arg);
- case WDIOC_SETOPTIONS:
- if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- pr_info("disable watchdog\n");
- ds1374_wdt_disable();
- return 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- pr_info("enable watchdog\n");
- ds1374_wdt_settimeout(wdt_margin);
- ds1374_wdt_ping();
- return 0;
- }
- return -EINVAL;
- }
- return -ENOTTY;
-}
-
-static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int ret;
- struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
-
- mutex_lock(&ds1374->mutex);
- ret = ds1374_wdt_ioctl(file, cmd, arg);
- mutex_unlock(&ds1374->mutex);
-
- return ret;
-}
-
-static int ds1374_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
-{
- if (code == SYS_DOWN || code == SYS_HALT)
- /* Disable Watchdog */
- ds1374_wdt_disable();
- return NOTIFY_DONE;
-}
-
-static const struct file_operations ds1374_wdt_fops = {
- .owner = THIS_MODULE,
- .read = ds1374_wdt_read,
- .unlocked_ioctl = ds1374_wdt_unlocked_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
- .write = ds1374_wdt_write,
- .open = ds1374_wdt_open,
- .release = ds1374_wdt_release,
- .llseek = no_llseek,
-};
-
-static struct miscdevice ds1374_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &ds1374_wdt_fops,
+static const struct watchdog_ops ds1374_wdt_fops = {
+ .owner = THIS_MODULE,
+ .start = ds1374_wdt_start,
+ .stop = ds1374_wdt_stop,
+ .ping = ds1374_wdt_ping,
+ .set_timeout = ds1374_wdt_settimeout,
};

-static struct notifier_block ds1374_wdt_notifier = {
- .notifier_call = ds1374_wdt_notify_sys,
-};

#endif /*CONFIG_RTC_DRV_DS1374_WDT*/
/*
@@ -653,15 +520,25 @@ static int ds1374_probe(struct i2c_client *client,

#ifdef CONFIG_RTC_DRV_DS1374_WDT
save_client = client;
- ret = misc_register(&ds1374_miscdev);
- if (ret)
- return ret;
- ret = register_reboot_notifier(&ds1374_wdt_notifier);
+ ds1374->wdt.info = &ds1374_wdt_info;
+ ds1374->wdt.ops = &ds1374_wdt_fops;
+ ds1374->wdt.timeout = TIMER_MARGIN_DEFAULT;
+ ds1374->wdt.min_timeout = TIMER_MARGIN_MIN;
+ ds1374->wdt.max_timeout = TIMER_MARGIN_MAX;
+
+ watchdog_init_timeout(&ds1374->wdt, timeout, &client->dev);
+ watchdog_set_nowayout(&ds1374->wdt, nowayout);
+ watchdog_stop_on_reboot(&ds1374->wdt);
+ watchdog_stop_on_unregister(&ds1374->wdt);
+
+ ret = devm_watchdog_register_device(&client->dev, &ds1374->wdt);
if (ret) {
- misc_deregister(&ds1374_miscdev);
+ dev_err(&client->dev, "failed to register DS1374 watchdog device\n");
return ret;
}
- ds1374_wdt_settimeout(131072);
+
+ ds1374_wdt_settimeout(&ds1374->wdt, timeout);
+ dev_info(&client->dev, "DS1374 watchdog device enabled\n");
#endif

return 0;
@@ -670,10 +547,10 @@ static int ds1374_probe(struct i2c_client *client,
static int ds1374_remove(struct i2c_client *client)
{
struct ds1374 *ds1374 = i2c_get_clientdata(client);
+
#ifdef CONFIG_RTC_DRV_DS1374_WDT
- misc_deregister(&ds1374_miscdev);
- ds1374_miscdev.parent = NULL;
- unregister_reboot_notifier(&ds1374_wdt_notifier);
+ dev_warn(&client->dev, "Unregister DS1374 watchdog device\n");
+ watchdog_unregister_device(&ds1374->wdt);
#endif

if (client->irq > 0) {
--
2.20.1
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