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rtc: ds1307: add support for watchdog timer on ds1388
The DS1388 variant has watchdog timer capabilities. When using a DS1388 and having enabled CONFIG_WATCHDOG_CORE register a watchdog device for the DS1388. Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20200330025500.6991-1-chris.packham@alliedtelesis.co.nz Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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2 changed files with 116 additions and 0 deletions
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@ -238,6 +238,7 @@ config RTC_DRV_AS3722
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config RTC_DRV_DS1307
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tristate "Dallas/Maxim DS1307/37/38/39/40/41, ST M41T00, EPSON RX-8025, ISL12057"
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select REGMAP_I2C
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select WATCHDOG_CORE if WATCHDOG
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help
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If you say yes here you get support for various compatible RTC
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chips (often with battery backup) connected with I2C. This driver
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@ -22,6 +22,7 @@
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#include <linux/hwmon-sysfs.h>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#include <linux/watchdog.h>
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/*
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* We can't determine type by probing, but if we expect pre-Linux code
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@ -144,8 +145,15 @@ enum ds_type {
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# define M41TXX_BIT_CALIB_SIGN BIT(5)
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# define M41TXX_M_CALIBRATION GENMASK(4, 0)
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#define DS1388_REG_WDOG_HUN_SECS 0x08
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#define DS1388_REG_WDOG_SECS 0x09
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#define DS1388_REG_FLAG 0x0b
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# define DS1388_BIT_WF BIT(6)
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# define DS1388_BIT_OSF BIT(7)
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#define DS1388_REG_CONTROL 0x0c
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# define DS1388_BIT_RST BIT(0)
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# define DS1388_BIT_WDE BIT(1)
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/* negative offset step is -2.034ppm */
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#define M41TXX_NEG_OFFSET_STEP_PPB 2034
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/* positive offset step is +4.068ppm */
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@ -854,6 +862,72 @@ static int m41txx_rtc_set_offset(struct device *dev, long offset)
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ctrl_reg);
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}
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#ifdef CONFIG_WATCHDOG_CORE
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static int ds1388_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
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u8 regs[2];
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int ret;
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ret = regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG,
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DS1388_BIT_WF, 0);
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if (ret)
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return ret;
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ret = regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
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DS1388_BIT_WDE | DS1388_BIT_RST, 0);
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if (ret)
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return ret;
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/*
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* watchdog timeouts are measured in seconds. So ignore hundredths of
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* seconds field.
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*/
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regs[0] = 0;
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regs[1] = bin2bcd(wdt_dev->timeout);
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ret = regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
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sizeof(regs));
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if (ret)
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return ret;
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return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
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DS1388_BIT_WDE | DS1388_BIT_RST,
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DS1388_BIT_WDE | DS1388_BIT_RST);
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}
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static int ds1388_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
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return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
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DS1388_BIT_WDE | DS1388_BIT_RST, 0);
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}
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static int ds1388_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
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u8 regs[2];
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return regmap_bulk_read(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
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sizeof(regs));
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}
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static int ds1388_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int val)
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{
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struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
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u8 regs[2];
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wdt_dev->timeout = val;
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regs[0] = 0;
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regs[1] = bin2bcd(wdt_dev->timeout);
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return regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
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sizeof(regs));
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}
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#endif
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static const struct rtc_class_ops rx8130_rtc_ops = {
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.read_time = ds1307_get_time,
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.set_time = ds1307_set_time,
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@ -1576,6 +1650,46 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
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#endif /* CONFIG_COMMON_CLK */
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#ifdef CONFIG_WATCHDOG_CORE
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static const struct watchdog_info ds1388_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "DS1388 watchdog",
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};
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static const struct watchdog_ops ds1388_wdt_ops = {
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.owner = THIS_MODULE,
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.start = ds1388_wdt_start,
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.stop = ds1388_wdt_stop,
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.ping = ds1388_wdt_ping,
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.set_timeout = ds1388_wdt_set_timeout,
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};
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static void ds1307_wdt_register(struct ds1307 *ds1307)
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{
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struct watchdog_device *wdt;
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if (ds1307->type != ds_1388)
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return;
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wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
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wdt->info = &ds1388_wdt_info;
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wdt->ops = &ds1388_wdt_ops;
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wdt->timeout = 99;
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wdt->max_timeout = 99;
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wdt->min_timeout = 1;
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watchdog_init_timeout(wdt, 0, ds1307->dev);
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watchdog_set_drvdata(wdt, ds1307);
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devm_watchdog_register_device(ds1307->dev, wdt);
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}
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#else
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static void ds1307_wdt_register(struct ds1307 *ds1307)
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{
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}
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#endif /* CONFIG_WATCHDOG_CORE */
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static const struct regmap_config regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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@ -1865,6 +1979,7 @@ static int ds1307_probe(struct i2c_client *client,
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ds1307_hwmon_register(ds1307);
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ds1307_clks_register(ds1307);
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ds1307_wdt_register(ds1307);
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return 0;
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