| Message ID | HK2PR01MB328182D5A54BFAA8A22E448AFA640@HK2PR01MB3281.apcprd01.prod.exchangelabs.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [v4] rtc: rtc-ds1374: wdt: Use watchdog core for watchdog part | expand |
On 7/8/20 11:34 PM, Johnson CH Chen (陳昭勳) wrote: > Let ds1374 watchdog use watchdog core functions. 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> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > v3->v4: > - Fix coding styles > - Remove dev_info() in ds1374_wdt_settimeout() > - Fix missing error check > > v2->v3: > - Fix a problem reported by WATCHDOG_CORE if WATCHDOG > - Remove save_client > - Let wdt_margin be 0 for watchdog_init_timeout() > - Use dev_info() rather than pr_info() > - Avoid more strings in this driver > > v1->v2: > - Use ds1374_wdt_settimeout() before registering the watchdog > - Remove watchdog_unregister_device() because devm_watchdog_register_device() is used > - Remove ds1374_wdt_ping() > - TIMER_MARGIN_MAX to 4095 for 24-bit value > - Keep wdt_margin > - Fix coding styles > > drivers/rtc/Kconfig | 1 + > drivers/rtc/rtc-ds1374.c | 258 +++++++++------------------------------ > 2 files changed, 62 insertions(+), 197 deletions(-) > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index b54d87d45c89..c25d51f35f0c 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -282,6 +282,7 @@ config RTC_DRV_DS1374 > config RTC_DRV_DS1374_WDT > bool "Dallas/Maxim DS1374 watchdog timer" > depends on RTC_DRV_DS1374 > + select WATCHDOG_CORE if WATCHDOG > help > If you say Y here you will get support for the > watchdog timer in the Dallas Semiconductor DS1374 > diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c > index 9c51a12cf70f..c71065d26cd2 100644 > --- a/drivers/rtc/rtc-ds1374.c > +++ b/drivers/rtc/rtc-ds1374.c > @@ -46,6 +46,7 @@ > #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 +72,9 @@ 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. > @@ -369,238 +372,98 @@ 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 4095 /* 24-bit value */ > > #define DRV_NAME "DS1374 Watchdog" > > -static int wdt_margin = WD_TIMO; > -static unsigned long wdt_is_open; > +static int wdt_margin; > module_param(wdt_margin, int, 0); > MODULE_PARM_DESC(wdt_margin, "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", > .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | > 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; > + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); > + struct i2c_client *client = ds1374->client; > + int ret, cr; > > - ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); > - if (ret < 0) > - goto out; > + wdt->timeout = timeout; > + > + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); > + if (cr < 0) > + return cr; > > /* 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); > + ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); > if (ret < 0) > - goto out; > + return ret; > > /* Set new watchdog time */ > - ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3); > - if (ret) { > - pr_info("couldn't set new watchdog time\n"); > - goto out; > - } > + timeout = timeout * 4096; > + ret = ds1374_write_rtc(client, timeout, DS1374_REG_WDALM0, 3); > + if (ret) > + 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); > + ret = i2c_smbus_write_byte_data(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_start(struct watchdog_device *wdt) > { > + struct ds1374 *ds1374 = watchdog_get_drvdata(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(ds1374->client, &val, DS1374_REG_WDALM0, 3); > } > > -static void ds1374_wdt_disable(void) > +static int ds1374_wdt_stop(struct watchdog_device *wdt) > { > + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); > + struct i2c_client *client = ds1374->client; > int cr; > > - cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); > + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); > + if (cr < 0) > + return cr; > + > /* Disable watchdog timer */ > cr &= ~DS1374_REG_CR_WACE; > > - 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; > + return i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); > } > > -/* > - * 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 struct notifier_block ds1374_wdt_notifier = { > - .notifier_call = ds1374_wdt_notify_sys, > +static const struct watchdog_ops ds1374_wdt_ops = { > + .owner = THIS_MODULE, > + .start = ds1374_wdt_start, > + .stop = ds1374_wdt_stop, > + .set_timeout = ds1374_wdt_settimeout, > }; > - > #endif /*CONFIG_RTC_DRV_DS1374_WDT*/ > /* > ***************************************************************************** > @@ -652,16 +515,22 @@ static int ds1374_probe(struct i2c_client *client, > return ret; > > #ifdef CONFIG_RTC_DRV_DS1374_WDT > - save_client = client; > - ret = misc_register(&ds1374_miscdev); > + ds1374->wdt.info = &ds1374_wdt_info; > + ds1374->wdt.ops = &ds1374_wdt_ops; > + 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, wdt_margin, &client->dev); > + watchdog_set_nowayout(&ds1374->wdt, nowayout); > + watchdog_stop_on_reboot(&ds1374->wdt); > + watchdog_stop_on_unregister(&ds1374->wdt); > + watchdog_set_drvdata(&ds1374->wdt, ds1374); > + ds1374_wdt_settimeout(&ds1374->wdt, ds1374->wdt.timeout); > + > + ret = devm_watchdog_register_device(&client->dev, &ds1374->wdt); > if (ret) > return ret; > - ret = register_reboot_notifier(&ds1374_wdt_notifier); > - if (ret) { > - misc_deregister(&ds1374_miscdev); > - return ret; > - } > - ds1374_wdt_settimeout(131072); > #endif > > return 0; > @@ -670,11 +539,6 @@ 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); > -#endif > > if (client->irq > 0) { > mutex_lock(&ds1374->mutex); >
Dear Alexandre Belloni, > From: Guenter Roeck <groeck7@gmail.com> On Behalf Of Guenter Roeck > Sent: Thursday, July 9, 2020 11:28 PM > To: Johnson CH Chen (陳昭勳) <JohnsonCH.Chen@moxa.com>; > linux-kernel@vger.kernel.org; linux-rtc@vger.kernel.org; > linux-watchdog@vger.kernel.org > Cc: Wim Van Sebroeck <wim@linux-watchdog.org>; a.zummo@towertech.it; > alexandre.belloni@bootlin.com > Subject: Re: [PATCH v4] rtc: rtc-ds1374: wdt: Use watchdog core for watchdog > part > > On 7/8/20 11:34 PM, Johnson CH Chen (陳昭勳) wrote: > > Let ds1374 watchdog use watchdog core functions. 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> > > Reviewed-by: Guenter Roeck <linux@roeck-us.net> > If there is no other big issue, could you please apply this patch? So many thanks! Best regards, Johnson > > --- > > v3->v4: > > - Fix coding styles > > - Remove dev_info() in ds1374_wdt_settimeout() > > - Fix missing error check > > > > v2->v3: > > - Fix a problem reported by WATCHDOG_CORE if WATCHDOG > > - Remove save_client > > - Let wdt_margin be 0 for watchdog_init_timeout() > > - Use dev_info() rather than pr_info() > > - Avoid more strings in this driver > > > > v1->v2: > > - Use ds1374_wdt_settimeout() before registering the watchdog > > - Remove watchdog_unregister_device() because > > devm_watchdog_register_device() is used > > - Remove ds1374_wdt_ping() > > - TIMER_MARGIN_MAX to 4095 for 24-bit value > > - Keep wdt_margin > > - Fix coding styles > > > > drivers/rtc/Kconfig | 1 + > > drivers/rtc/rtc-ds1374.c | 258 > > +++++++++------------------------------ > > 2 files changed, 62 insertions(+), 197 deletions(-) > > > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index > > b54d87d45c89..c25d51f35f0c 100644 > > --- a/drivers/rtc/Kconfig > > +++ b/drivers/rtc/Kconfig > > @@ -282,6 +282,7 @@ config RTC_DRV_DS1374 config > RTC_DRV_DS1374_WDT > > bool "Dallas/Maxim DS1374 watchdog timer" > > depends on RTC_DRV_DS1374 > > + select WATCHDOG_CORE if WATCHDOG > > help > > If you say Y here you will get support for the > > watchdog timer in the Dallas Semiconductor DS1374 diff --git > > a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c index > > 9c51a12cf70f..c71065d26cd2 100644 > > --- a/drivers/rtc/rtc-ds1374.c > > +++ b/drivers/rtc/rtc-ds1374.c > > @@ -46,6 +46,7 @@ > > #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 +72,9 @@ 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. > > @@ -369,238 +372,98 @@ 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 4095 /* 24-bit value */ > > > > #define DRV_NAME "DS1374 Watchdog" > > > > -static int wdt_margin = WD_TIMO; > > -static unsigned long wdt_is_open; > > +static int wdt_margin; > > module_param(wdt_margin, int, 0); > > MODULE_PARM_DESC(wdt_margin, "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", > > .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | > > 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; > > + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); > > + struct i2c_client *client = ds1374->client; > > + int ret, cr; > > > > - ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); > > - if (ret < 0) > > - goto out; > > + wdt->timeout = timeout; > > + > > + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); > > + if (cr < 0) > > + return cr; > > > > /* 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); > > + ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); > > if (ret < 0) > > - goto out; > > + return ret; > > > > /* Set new watchdog time */ > > - ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3); > > - if (ret) { > > - pr_info("couldn't set new watchdog time\n"); > > - goto out; > > - } > > + timeout = timeout * 4096; > > + ret = ds1374_write_rtc(client, timeout, DS1374_REG_WDALM0, 3); > > + if (ret) > > + 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); > > + ret = i2c_smbus_write_byte_data(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_start(struct watchdog_device *wdt) > > { > > + struct ds1374 *ds1374 = watchdog_get_drvdata(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(ds1374->client, &val, DS1374_REG_WDALM0, 3); > > } > > > > -static void ds1374_wdt_disable(void) > > +static int ds1374_wdt_stop(struct watchdog_device *wdt) > > { > > + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); > > + struct i2c_client *client = ds1374->client; > > int cr; > > > > - cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); > > + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); > > + if (cr < 0) > > + return cr; > > + > > /* Disable watchdog timer */ > > cr &= ~DS1374_REG_CR_WACE; > > > > - 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; > > + return i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); > > } > > > > -/* > > - * 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 struct notifier_block ds1374_wdt_notifier = { > > - .notifier_call = ds1374_wdt_notify_sys, > > +static const struct watchdog_ops ds1374_wdt_ops = { > > + .owner = THIS_MODULE, > > + .start = ds1374_wdt_start, > > + .stop = ds1374_wdt_stop, > > + .set_timeout = ds1374_wdt_settimeout, > > }; > > - > > #endif /*CONFIG_RTC_DRV_DS1374_WDT*/ > > /* > > > > > **************************************************************** > ****** > > ******* @@ -652,16 +515,22 @@ static int ds1374_probe(struct > > i2c_client *client, > > return ret; > > > > #ifdef CONFIG_RTC_DRV_DS1374_WDT > > - save_client = client; > > - ret = misc_register(&ds1374_miscdev); > > + ds1374->wdt.info = &ds1374_wdt_info; > > + ds1374->wdt.ops = &ds1374_wdt_ops; > > + 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, wdt_margin, &client->dev); > > + watchdog_set_nowayout(&ds1374->wdt, nowayout); > > + watchdog_stop_on_reboot(&ds1374->wdt); > > + watchdog_stop_on_unregister(&ds1374->wdt); > > + watchdog_set_drvdata(&ds1374->wdt, ds1374); > > + ds1374_wdt_settimeout(&ds1374->wdt, ds1374->wdt.timeout); > > + > > + ret = devm_watchdog_register_device(&client->dev, &ds1374->wdt); > > if (ret) > > return ret; > > - ret = register_reboot_notifier(&ds1374_wdt_notifier); > > - if (ret) { > > - misc_deregister(&ds1374_miscdev); > > - return ret; > > - } > > - ds1374_wdt_settimeout(131072); > > #endif > > > > return 0; > > @@ -670,11 +539,6 @@ 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); > > -#endif > > > > if (client->irq > 0) { > > mutex_lock(&ds1374->mutex); > >
On Thu, 9 Jul 2020 06:34:06 +0000, Johnson CH Chen (陳昭勳) wrote: > Let ds1374 watchdog use watchdog core functions. It also includes > improving watchdog timer setting and nowayout, and just uses ioctl() > of watchdog core. Applied, thanks! [1/1] rtc: ds1374: wdt: Use watchdog core for watchdog part commit: d3de4beb14a887754b83843bf23b6dbe8d022764 Best regards,
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b54d87d45c89..c25d51f35f0c 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -282,6 +282,7 @@ config RTC_DRV_DS1374 config RTC_DRV_DS1374_WDT bool "Dallas/Maxim DS1374 watchdog timer" depends on RTC_DRV_DS1374 + select WATCHDOG_CORE if WATCHDOG help If you say Y here you will get support for the watchdog timer in the Dallas Semiconductor DS1374 diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c index 9c51a12cf70f..c71065d26cd2 100644 --- a/drivers/rtc/rtc-ds1374.c +++ b/drivers/rtc/rtc-ds1374.c @@ -46,6 +46,7 @@ #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 +72,9 @@ 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. @@ -369,238 +372,98 @@ 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 4095 /* 24-bit value */ #define DRV_NAME "DS1374 Watchdog" -static int wdt_margin = WD_TIMO; -static unsigned long wdt_is_open; +static int wdt_margin; module_param(wdt_margin, int, 0); MODULE_PARM_DESC(wdt_margin, "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", .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | 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; + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); + struct i2c_client *client = ds1374->client; + int ret, cr; - ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); - if (ret < 0) - goto out; + wdt->timeout = timeout; + + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); + if (cr < 0) + return cr; /* 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); + ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); if (ret < 0) - goto out; + return ret; /* Set new watchdog time */ - ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3); - if (ret) { - pr_info("couldn't set new watchdog time\n"); - goto out; - } + timeout = timeout * 4096; + ret = ds1374_write_rtc(client, timeout, DS1374_REG_WDALM0, 3); + if (ret) + 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); + ret = i2c_smbus_write_byte_data(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_start(struct watchdog_device *wdt) { + struct ds1374 *ds1374 = watchdog_get_drvdata(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(ds1374->client, &val, DS1374_REG_WDALM0, 3); } -static void ds1374_wdt_disable(void) +static int ds1374_wdt_stop(struct watchdog_device *wdt) { + struct ds1374 *ds1374 = watchdog_get_drvdata(wdt); + struct i2c_client *client = ds1374->client; int cr; - cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR); + cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR); + if (cr < 0) + return cr; + /* Disable watchdog timer */ cr &= ~DS1374_REG_CR_WACE; - 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; + return i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr); } -/* - * 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 struct notifier_block ds1374_wdt_notifier = { - .notifier_call = ds1374_wdt_notify_sys, +static const struct watchdog_ops ds1374_wdt_ops = { + .owner = THIS_MODULE, + .start = ds1374_wdt_start, + .stop = ds1374_wdt_stop, + .set_timeout = ds1374_wdt_settimeout, }; - #endif /*CONFIG_RTC_DRV_DS1374_WDT*/ /* ***************************************************************************** @@ -652,16 +515,22 @@ static int ds1374_probe(struct i2c_client *client, return ret; #ifdef CONFIG_RTC_DRV_DS1374_WDT - save_client = client; - ret = misc_register(&ds1374_miscdev); + ds1374->wdt.info = &ds1374_wdt_info; + ds1374->wdt.ops = &ds1374_wdt_ops; + 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, wdt_margin, &client->dev); + watchdog_set_nowayout(&ds1374->wdt, nowayout); + watchdog_stop_on_reboot(&ds1374->wdt); + watchdog_stop_on_unregister(&ds1374->wdt); + watchdog_set_drvdata(&ds1374->wdt, ds1374); + ds1374_wdt_settimeout(&ds1374->wdt, ds1374->wdt.timeout); + + ret = devm_watchdog_register_device(&client->dev, &ds1374->wdt); if (ret) return ret; - ret = register_reboot_notifier(&ds1374_wdt_notifier); - if (ret) { - misc_deregister(&ds1374_miscdev); - return ret; - } - ds1374_wdt_settimeout(131072); #endif return 0; @@ -670,11 +539,6 @@ 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); -#endif if (client->irq > 0) { mutex_lock(&ds1374->mutex);
Let ds1374 watchdog use watchdog core functions. 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> --- v3->v4: - Fix coding styles - Remove dev_info() in ds1374_wdt_settimeout() - Fix missing error check v2->v3: - Fix a problem reported by WATCHDOG_CORE if WATCHDOG - Remove save_client - Let wdt_margin be 0 for watchdog_init_timeout() - Use dev_info() rather than pr_info() - Avoid more strings in this driver v1->v2: - Use ds1374_wdt_settimeout() before registering the watchdog - Remove watchdog_unregister_device() because devm_watchdog_register_device() is used - Remove ds1374_wdt_ping() - TIMER_MARGIN_MAX to 4095 for 24-bit value - Keep wdt_margin - Fix coding styles drivers/rtc/Kconfig | 1 + drivers/rtc/rtc-ds1374.c | 258 +++++++++------------------------------ 2 files changed, 62 insertions(+), 197 deletions(-)