hwmon: Driver for DA9052/53 PMIC (e41f6432) · Commits · e / devices / android_kernel_oneplus_sm8150

Documentation/hwmon/da9052

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		Supported chips:
		* Dialog Semiconductors DA9052-BC and DA9053-AA/Bx PMICs
		Prefix: 'da9052'
		Datasheet: Datasheet is not publicly available.

		Authors: David Dajun Chen <dchen@diasemi.com>

		Description
		-----------

		The DA9052/53 provides an Analogue to Digital Converter (ADC) with 10 bits
		resolution and track and hold circuitry combined with an analogue input
		multiplexer. The analogue input multiplexer will allow conversion of up to 10
		different inputs. The track and hold circuit ensures stable input voltages at
		the input of the ADC during the conversion.

		The ADC is used to measure the following inputs:
		Channel 0: VDDOUT - measurement of the system voltage
		Channel 1: ICH - internal battery charger current measurement
		Channel 2: TBAT - output from the battery NTC
		Channel 3: VBAT - measurement of the battery voltage
		Channel 4: ADC_IN4 - high impedance input (0 - 2.5V)
		Channel 5: ADC_IN5 - high impedance input (0 - 2.5V)
		Channel 6: ADC_IN6 - high impedance input (0 - 2.5V)
		Channel 7: XY - TSI interface to measure the X and Y voltage of the touch
		screen resistive potentiometers
		Channel 8: Internal Tjunc. - sense (internal temp. sensor)
		Channel 9: VBBAT - measurement of the backup battery voltage

		By using sysfs attributes we can measure the system voltage VDDOUT, the battery
		charging current ICH, battery temperature TBAT, battery junction temperature
		TJUNC, battery voltage VBAT and the back up battery voltage VBBAT.

		Voltage Monitoring
		------------------

		Voltages are sampled by a 10 bit ADC.

		The battery voltage is calculated as:
		Milli volt = ((ADC value * 1000) / 512) + 2500

		The backup battery voltage is calculated as:
		Milli volt = (ADC value * 2500) / 512;

		The voltages on ADC channels 4, 5 and 6 are calculated as:
		Milli volt = (ADC value * 2500) / 1023

		Temperature Monitoring
		----------------------

		Temperatures are sampled by a 10 bit ADC. Junction and battery temperatures
		are monitored by the ADC channels.

		The junction temperature is calculated:
		Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
		The junction temperature attribute is supported by the driver.

		The battery temperature is calculated:
		Degree Celcius = 1 / (t1 + 1/298)- 273
		where t1 = (1/B)* ln(( ADCval * 2.5)/(R25ITBAT255))
		Default values of R25, B, ITBAT are 10e3, 3380 and 50e-6 respectively.

drivers/hwmon/Kconfig

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		@@ -314,6 +314,16 @@ config SENSORS_DS1621
		This driver can also be built as a module. If so, the module
		will be called ds1621.

		config SENSORS_DA9052_ADC
		tristate "Dialog DA9052/DA9053 ADC"
		depends on PMIC_DA9052
		help
		Say y here to support the ADC found on Dialog Semiconductor
		DA9052-BC and DA9053-AA/Bx PMICs.

		This driver can also be built as module. If so, the module
		will be called da9052-hwmon.

		config SENSORS_EXYNOS4_TMU
		tristate "Temperature sensor on Samsung EXYNOS4"
		depends on ARCH_EXYNOS4

drivers/hwmon/Makefile

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		@@ -42,6 +42,7 @@ obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
		obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
		obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
		obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
		obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
		obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
		obj-$(CONFIG_SENSORS_DS620) += ds620.o
		obj-$(CONFIG_SENSORS_DS1621) += ds1621.o

drivers/hwmon/da9052-hwmon.c

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		/*
		* HWMON Driver for Dialog DA9052
		*
		* Copyright(c) 2012 Dialog Semiconductor Ltd.
		*
		* Author: David Dajun Chen <dchen@diasemi.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the
		* Free Software Foundation; either version 2 of the License, or (at your
		* option) any later version.
		*
		*/

		#include <linux/delay.h>
		#include <linux/err.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/platform_device.h>

		#include <linux/mfd/da9052/da9052.h>
		#include <linux/mfd/da9052/reg.h>

		struct da9052_hwmon {
		struct da9052 *da9052;
		struct device *class_device;
		struct mutex hwmon_lock;
		};

		static const char * const input_names[] = {
		[DA9052_ADC_VDDOUT] = "VDDOUT",
		[DA9052_ADC_ICH] = "CHARGING CURRENT",
		[DA9052_ADC_TBAT] = "BATTERY TEMP",
		[DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
		[DA9052_ADC_IN4] = "ADC IN4",
		[DA9052_ADC_IN5] = "ADC IN5",
		[DA9052_ADC_IN6] = "ADC IN6",
		[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
		[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
		};

		/* Conversion function for VDDOUT and VBAT */
		static inline int volt_reg_to_mV(int value)
		{
		return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500;
		}

		/* Conversion function for ADC channels 4, 5 and 6 */
		static inline int input_reg_to_mV(int value)
		{
		return DIV_ROUND_CLOSEST(value * 2500, 1023);
		}

		/* Conversion function for VBBAT */
		static inline int vbbat_reg_to_mV(int value)
		{
		return DIV_ROUND_CLOSEST(value * 2500, 512);
		}

		static int da9052_enable_vddout_channel(struct da9052 *da9052)
		{
		int ret;

		ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
		if (ret < 0)
		return ret;

		ret \|= DA9052_ADCCONT_AUTOVDDEN;

		return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
		}

		static int da9052_disable_vddout_channel(struct da9052 *da9052)
		{
		int ret;

		ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
		if (ret < 0)
		return ret;

		ret &= ~DA9052_ADCCONT_AUTOVDDEN;

		return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
		}

		static ssize_t da9052_read_vddout(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int ret, vdd;

		mutex_lock(&hwmon->hwmon_lock);

		ret = da9052_enable_vddout_channel(hwmon->da9052);
		if (ret < 0)
		goto hwmon_err;

		vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
		if (vdd < 0) {
		ret = vdd;
		goto hwmon_err_release;
		}

		ret = da9052_disable_vddout_channel(hwmon->da9052);
		if (ret < 0)
		goto hwmon_err;

		mutex_unlock(&hwmon->hwmon_lock);
		return sprintf(buf, "%d\n", volt_reg_to_mV(vdd));

		hwmon_err_release:
		da9052_disable_vddout_channel(hwmon->da9052);
		hwmon_err:
		mutex_unlock(&hwmon->hwmon_lock);
		return ret;
		}

		static ssize_t da9052_read_ich(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int ret;

		ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
		if (ret < 0)
		return ret;

		/* Equivalent to 3.9mA/bit in register ICHG_AV */
		return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
		}

		static ssize_t da9052_read_tbat(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);

		return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
		}

		static ssize_t da9052_read_vbat(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int ret;

		ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
		if (ret < 0)
		return ret;

		return sprintf(buf, "%d\n", volt_reg_to_mV(ret));
		}

		static ssize_t da9052_read_misc_channel(struct device *dev,
		struct device_attribute *devattr,
		char *buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int channel = to_sensor_dev_attr(devattr)->index;
		int ret;

		ret = da9052_adc_manual_read(hwmon->da9052, channel);
		if (ret < 0)
		return ret;

		return sprintf(buf, "%d\n", input_reg_to_mV(ret));
		}

		static ssize_t da9052_read_tjunc(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int tjunc;
		int toffset;

		tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
		if (tjunc < 0)
		return tjunc;

		toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
		if (toffset < 0)
		return toffset;

		/*
		* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
		* T_OFFSET is a trim value used to improve accuracy of the result
		*/
		return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
		}

		static ssize_t da9052_read_vbbat(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
		int ret;

		ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
		if (ret < 0)
		return ret;

		return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret));
		}

		static ssize_t da9052_hwmon_show_name(struct device *dev,
		struct device_attribute *devattr,
		char *buf)
		{
		return sprintf(buf, "da9052-hwmon\n");
		}

		static ssize_t show_label(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		return sprintf(buf, "%s\n",
		input_names[to_sensor_dev_attr(devattr)->index]);
		}

		static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
		DA9052_ADC_VDDOUT);
		static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_VDDOUT);
		static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
		DA9052_ADC_VBAT);
		static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_VBAT);
		static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
		DA9052_ADC_IN4);
		static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_IN4);
		static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
		DA9052_ADC_IN5);
		static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_IN5);
		static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
		DA9052_ADC_IN6);
		static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_IN6);
		static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
		DA9052_ADC_VBBAT);
		static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_VBBAT);

		static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
		DA9052_ADC_ICH);
		static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_ICH);

		static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
		DA9052_ADC_TBAT);
		static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_TBAT);
		static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
		DA9052_ADC_TJUNC);
		static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
		DA9052_ADC_TJUNC);

		static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);

		static struct attribute *da9052_attr[] = {
		&dev_attr_name.attr,
		&sensor_dev_attr_in0_input.dev_attr.attr,
		&sensor_dev_attr_in0_label.dev_attr.attr,
		&sensor_dev_attr_in3_input.dev_attr.attr,
		&sensor_dev_attr_in3_label.dev_attr.attr,
		&sensor_dev_attr_in4_input.dev_attr.attr,
		&sensor_dev_attr_in4_label.dev_attr.attr,
		&sensor_dev_attr_in5_input.dev_attr.attr,
		&sensor_dev_attr_in5_label.dev_attr.attr,
		&sensor_dev_attr_in6_input.dev_attr.attr,
		&sensor_dev_attr_in6_label.dev_attr.attr,
		&sensor_dev_attr_in9_input.dev_attr.attr,
		&sensor_dev_attr_in9_label.dev_attr.attr,
		&sensor_dev_attr_curr1_input.dev_attr.attr,
		&sensor_dev_attr_curr1_label.dev_attr.attr,
		&sensor_dev_attr_temp2_input.dev_attr.attr,
		&sensor_dev_attr_temp2_label.dev_attr.attr,
		&sensor_dev_attr_temp8_input.dev_attr.attr,
		&sensor_dev_attr_temp8_label.dev_attr.attr,
		NULL
		};

		static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};

		static int __devinit da9052_hwmon_probe(struct platform_device *pdev)
		{
		struct da9052_hwmon *hwmon;
		int ret;

		hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
		GFP_KERNEL);
		if (!hwmon)
		return -ENOMEM;

		mutex_init(&hwmon->hwmon_lock);
		hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);

		platform_set_drvdata(pdev, hwmon);

		ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
		if (ret)
		goto err_mem;

		hwmon->class_device = hwmon_device_register(&pdev->dev);
		if (IS_ERR(hwmon->class_device)) {
		ret = PTR_ERR(hwmon->class_device);
		goto err_sysfs;
		}

		return 0;

		err_sysfs:
		sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
		err_mem:
		return ret;
		}

		static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
		{
		struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);

		hwmon_device_unregister(hwmon->class_device);
		sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);

		return 0;
		}

		static struct platform_driver da9052_hwmon_driver = {
		.probe = da9052_hwmon_probe,
		.remove = __devexit_p(da9052_hwmon_remove),
		.driver = {
		.name = "da9052-hwmon",
		.owner = THIS_MODULE,
		},
		};

		module_platform_driver(da9052_hwmon_driver);

		MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
		MODULE_DESCRIPTION("DA9052 HWMON driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:da9052-hwmon");