rtc: ds3232: add temperature support (c35c4195) · Commits · 戴 / test

drivers/rtc/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -802,6 +802,14 @@ config RTC_DRV_DS3232
		This driver can also be built as a module. If so, the module
		will be called rtc-ds3232.

		config RTC_DRV_DS3232_HWMON
		bool "HWMON support for Dallas/Maxim DS3232/DS3234"
		depends on RTC_DRV_DS3232 && HWMON && !(RTC_DRV_DS3232=y && HWMON=m)
		default y
		help
		Say Y here if you want to expose temperature sensor data on
		rtc-ds3232

		config RTC_DRV_PCF2127
		tristate "NXP PCF2127"
		depends on RTC_I2C_AND_SPI

drivers/rtc/rtc-ds3232.c

+119 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		#include <linux/bcd.h>
		#include <linux/slab.h>
		#include <linux/regmap.h>
		#include <linux/hwmon.h>

		#define DS3232_REG_SECONDS 0x00
		#define DS3232_REG_MINUTES 0x01
		@@ -46,6 +47,8 @@
		# define DS3232_REG_SR_A2F 0x02
		# define DS3232_REG_SR_A1F 0x01

		#define DS3232_REG_TEMPERATURE 0x11

		struct ds3232 {
		struct device *dev;
		struct regmap *regmap;
		@@ -275,6 +278,120 @@ static int ds3232_update_alarm(struct device *dev, unsigned int enabled)
		return ret;
		}

		/*
		* Temperature sensor support for ds3232/ds3234 devices.
		* A user-initiated temperature conversion is not started by this function,
		* so the temperature is updated once every 64 seconds.
		*/
		static int ds3232_hwmon_read_temp(struct device dev, long int mC)
		{
		struct ds3232 *ds3232 = dev_get_drvdata(dev);
		u8 temp_buf[2];
		s16 temp;
		int ret;

		ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf,
		sizeof(temp_buf));
		if (ret < 0)
		return ret;

		/*
		* Temperature is represented as a 10-bit code with a resolution of
		* 0.25 degree celsius and encoded in two's complement format.
		*/
		temp = (temp_buf[0] << 8) \| temp_buf[1];
		temp >>= 6;
		mC = temp 250;

		return 0;
		}

		static umode_t ds3232_hwmon_is_visible(const void *data,
		enum hwmon_sensor_types type,
		u32 attr, int channel)
		{
		if (type != hwmon_temp)
		return 0;

		switch (attr) {
		case hwmon_temp_input:
		return 0444;
		default:
		return 0;
		}
		}

		static int ds3232_hwmon_read(struct device *dev,
		enum hwmon_sensor_types type,
		u32 attr, int channel, long *temp)
		{
		int err;

		switch (attr) {
		case hwmon_temp_input:
		err = ds3232_hwmon_read_temp(dev, temp);
		break;
		default:
		err = -EOPNOTSUPP;
		break;
		}

		return err;
		}

		static u32 ds3232_hwmon_chip_config[] = {
		HWMON_C_REGISTER_TZ,
		0
		};

		static const struct hwmon_channel_info ds3232_hwmon_chip = {
		.type = hwmon_chip,
		.config = ds3232_hwmon_chip_config,
		};

		static u32 ds3232_hwmon_temp_config[] = {
		HWMON_T_INPUT,
		0
		};

		static const struct hwmon_channel_info ds3232_hwmon_temp = {
		.type = hwmon_temp,
		.config = ds3232_hwmon_temp_config,
		};

		static const struct hwmon_channel_info *ds3232_hwmon_info[] = {
		&ds3232_hwmon_chip,
		&ds3232_hwmon_temp,
		NULL
		};

		static const struct hwmon_ops ds3232_hwmon_hwmon_ops = {
		.is_visible = ds3232_hwmon_is_visible,
		.read = ds3232_hwmon_read,
		};

		static const struct hwmon_chip_info ds3232_hwmon_chip_info = {
		.ops = &ds3232_hwmon_hwmon_ops,
		.info = ds3232_hwmon_info,
		};

		static void ds3232_hwmon_register(struct device dev, const char name)
		{
		struct ds3232 *ds3232 = dev_get_drvdata(dev);
		struct device *hwmon_dev;

		if (!IS_ENABLED(CONFIG_RTC_DRV_DS3232_HWMON))
		return;

		hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232,
		&ds3232_hwmon_chip_info,
		NULL);
		if (IS_ERR(hwmon_dev)) {
		dev_err(dev, "unable to register hwmon device %ld\n",
		PTR_ERR(hwmon_dev));
		}
		}

		static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
		{
		struct ds3232 *ds3232 = dev_get_drvdata(dev);
		@@ -366,6 +483,8 @@ static int ds3232_probe(struct device dev, struct regmap regmap, int irq,
		if (ds3232->irq > 0)
		device_init_wakeup(dev, 1);

		ds3232_hwmon_register(dev, name);

		ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
		THIS_MODULE);
		if (IS_ERR(ds3232->rtc))

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