drivers/hwmon/da9052-hwmon.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * HWMON Driver for Dialog DA9052
  *
  * Copyright(c) 2012 Dialog Semiconductor Ltd.
  *
  * Author: David Dajun Chen <dchen@diasemi.com>
  */

 #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/property.h>

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

 struct da9052_hwmon {
 	struct da9052		*da9052;
 	struct mutex		hwmon_lock;
 	bool			tsi_as_adc;
 	int			tsiref_mv;
 	struct regulator	*tsiref;
 	struct completion	tsidone;
 };

 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_TSI_XP]	=	"ADC TS X+",
 	[DA9052_ADC_TSI_YP]	=	"ADC TS Y+",
 	[DA9052_ADC_TSI_XN]	=	"ADC TS X-",
 	[DA9052_ADC_TSI_YN]	=	"ADC TS Y-",
 	[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 * 2000, 1023) + 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 * 5000, 1023);
 }

 static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
 {
 	return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
 }

 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
 {
 	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
 				 DA9052_ADCCONT_AUTOVDDEN,
 				 DA9052_ADCCONT_AUTOVDDEN);
 }

 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
 {
 	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
 				 DA9052_ADCCONT_AUTOVDDEN, 0);
 }

 static ssize_t da9052_vddout_show(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_ich_show(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_tbat_show(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_vbat_show(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_misc_channel_show(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 int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
 {
 	u8 val = DA9052_TSICONTB_TSIMAN;

 	switch (channel) {
 	case DA9052_ADC_TSI_XP:
 		val |= DA9052_TSICONTB_TSIMUX_XP;
 		break;
 	case DA9052_ADC_TSI_YP:
 		val |= DA9052_TSICONTB_TSIMUX_YP;
 		break;
 	case DA9052_ADC_TSI_XN:
 		val |= DA9052_TSICONTB_TSIMUX_XN;
 		break;
 	case DA9052_ADC_TSI_YN:
 		val |= DA9052_TSICONTB_TSIMUX_YN;
 		break;
 	}

 	return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
 }

 static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
 {
 	u8 regs[3];
 	int msb, lsb, err;

 	/* block read to avoid separation of MSB and LSB */
 	err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
 				ARRAY_SIZE(regs), regs);
 	if (err)
 		return err;

 	switch (channel) {
 	case DA9052_ADC_TSI_XP:
 	case DA9052_ADC_TSI_XN:
 		msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
 		lsb = regs[2] & DA9052_TSILSB_TSIXL;
 		lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
 		break;
 	case DA9052_ADC_TSI_YP:
 	case DA9052_ADC_TSI_YN:
 		msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
 		lsb = regs[2] & DA9052_TSILSB_TSIYL;
 		lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return msb | lsb;
 }


 static ssize_t __da9052_read_tsi(struct device *dev, int channel)
 {
 	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 	int ret;

 	reinit_completion(&hwmon->tsidone);

 	ret = da9052_request_tsi_read(hwmon, channel);
 	if (ret < 0)
 		return ret;

 	/* Wait for an conversion done interrupt */
 	if (!wait_for_completion_timeout(&hwmon->tsidone,
 					 msecs_to_jiffies(500)))
 		return -ETIMEDOUT;

 	return da9052_get_tsi_result(hwmon, channel);
 }

 static ssize_t da9052_tsi_show(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;

 	mutex_lock(&hwmon->da9052->auxadc_lock);
 	ret = __da9052_read_tsi(dev, channel);
 	mutex_unlock(&hwmon->da9052->auxadc_lock);

 	if (ret < 0)
 		return ret;
 	else
 		return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
 }

 static ssize_t da9052_tjunc_show(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_vbbat_show(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 label_show(struct device *dev,
 			  struct device_attribute *devattr, char *buf)
 {
 	return sprintf(buf, "%s\n",
 		       input_names[to_sensor_dev_attr(devattr)->index]);
 }

 static umode_t da9052_channel_is_visible(struct kobject *kobj,
 					 struct attribute *attr, int index)
 {
 	struct device *dev = kobj_to_dev(kobj);
 	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 	struct device_attribute *dattr = container_of(attr,
 				struct device_attribute, attr);
 	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);

 	if (!hwmon->tsi_as_adc) {
 		switch (sattr->index) {
 		case DA9052_ADC_TSI_XP:
 		case DA9052_ADC_TSI_YP:
 		case DA9052_ADC_TSI_XN:
 		case DA9052_ADC_TSI_YN:
 			return 0;
 		}
 	}

 	return attr->mode;
 }

 static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
 static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
 static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
 static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
 static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
 static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
 static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
 static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
 static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
 static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);

 static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
 static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
 static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
 static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
 static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
 static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
 static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
 static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);

 static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
 static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);

 static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
 static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
 static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);

 static struct attribute *da9052_attrs[] = {
 	&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_in70_input.dev_attr.attr,
 	&sensor_dev_attr_in70_label.dev_attr.attr,
 	&sensor_dev_attr_in71_input.dev_attr.attr,
 	&sensor_dev_attr_in71_label.dev_attr.attr,
 	&sensor_dev_attr_in72_input.dev_attr.attr,
 	&sensor_dev_attr_in72_label.dev_attr.attr,
 	&sensor_dev_attr_in73_input.dev_attr.attr,
 	&sensor_dev_attr_in73_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_group = {
 	.attrs = da9052_attrs,
 	.is_visible = da9052_channel_is_visible,
 };
 __ATTRIBUTE_GROUPS(da9052);

 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
 {
 	struct da9052_hwmon *hwmon = data;

 	complete(&hwmon->tsidone);
 	return IRQ_HANDLED;
 }

 static int da9052_hwmon_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct da9052_hwmon *hwmon;
 	struct device *hwmon_dev;
 	int err;

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

 	platform_set_drvdata(pdev, hwmon);

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

 	init_completion(&hwmon->tsidone);

 	hwmon->tsi_as_adc =
 		device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");

 	if (hwmon->tsi_as_adc) {
 		hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
 		if (IS_ERR(hwmon->tsiref)) {
 			err = PTR_ERR(hwmon->tsiref);
 			dev_err(&pdev->dev, "failed to get tsiref: %d", err);
 			return err;
 		}

 		err = regulator_enable(hwmon->tsiref);
 		if (err)
 			return err;

 		hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
 		if (hwmon->tsiref_mv < 0) {
 			err = hwmon->tsiref_mv;
 			goto exit_regulator;
 		}

 		/* convert from microvolt (DT) to millivolt (hwmon) */
 		hwmon->tsiref_mv /= 1000;

 		/* TSIREF limits from datasheet */
 		if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
 			dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
 				hwmon->tsiref_mv);
 			err = -ENXIO;
 			goto exit_regulator;
 		}

 		/* disable touchscreen features */
 		da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);

 		/* Sample every 1ms */
 		da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
 					  DA9052_ADCCONT_ADCMODE,
 					  DA9052_ADCCONT_ADCMODE);

 		err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
 					 "tsiready-irq", da9052_tsi_datardy_irq,
 					 hwmon);
 		if (err) {
 			dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
 				err);
 			goto exit_regulator;
 		}
 	}

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
 							   hwmon,
 							   da9052_groups);
 	err = PTR_ERR_OR_ZERO(hwmon_dev);
 	if (err)
 		goto exit_irq;

 	return 0;

 exit_irq:
 	if (hwmon->tsi_as_adc)
 		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 exit_regulator:
 	if (hwmon->tsiref)
 		regulator_disable(hwmon->tsiref);

 	return err;
 }

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

 	if (hwmon->tsi_as_adc) {
 		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 		regulator_disable(hwmon->tsiref);
 	}
 }

 static struct platform_driver da9052_hwmon_driver = {
 	.probe = da9052_hwmon_probe,
 	.remove_new = da9052_hwmon_remove,
 	.driver = {
 		.name = "da9052-hwmon",
 	},
 };

 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");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* HWMON Driver for Dialog DA9052
	*
	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	*
	* Author: David Dajun Chen <dchen@diasemi.com>
	*/

	#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/property.h>

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

	struct da9052_hwmon {
	struct da9052 *da9052;
	struct mutex hwmon_lock;
	bool tsi_as_adc;
	int tsiref_mv;
	struct regulator *tsiref;
	struct completion tsidone;
	};

	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_TSI_XP] = "ADC TS X+",
	[DA9052_ADC_TSI_YP] = "ADC TS Y+",
	[DA9052_ADC_TSI_XN] = "ADC TS X-",
	[DA9052_ADC_TSI_YN] = "ADC TS Y-",
	[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 * 2000, 1023) + 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 * 5000, 1023);
	}

	static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
	{
	return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
	}

	static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
	{
	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
	DA9052_ADCCONT_AUTOVDDEN,
	DA9052_ADCCONT_AUTOVDDEN);
	}

	static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
	{
	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
	DA9052_ADCCONT_AUTOVDDEN, 0);
	}

	static ssize_t da9052_vddout_show(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_ich_show(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_tbat_show(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_vbat_show(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_misc_channel_show(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 int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
	{
	u8 val = DA9052_TSICONTB_TSIMAN;

	switch (channel) {
	case DA9052_ADC_TSI_XP:
	val \|= DA9052_TSICONTB_TSIMUX_XP;
	break;
	case DA9052_ADC_TSI_YP:
	val \|= DA9052_TSICONTB_TSIMUX_YP;
	break;
	case DA9052_ADC_TSI_XN:
	val \|= DA9052_TSICONTB_TSIMUX_XN;
	break;
	case DA9052_ADC_TSI_YN:
	val \|= DA9052_TSICONTB_TSIMUX_YN;
	break;
	}

	return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
	}

	static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
	{
	u8 regs[3];
	int msb, lsb, err;

	/* block read to avoid separation of MSB and LSB */
	err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
	ARRAY_SIZE(regs), regs);
	if (err)
	return err;

	switch (channel) {
	case DA9052_ADC_TSI_XP:
	case DA9052_ADC_TSI_XN:
	msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
	lsb = regs[2] & DA9052_TSILSB_TSIXL;
	lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
	break;
	case DA9052_ADC_TSI_YP:
	case DA9052_ADC_TSI_YN:
	msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
	lsb = regs[2] & DA9052_TSILSB_TSIYL;
	lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
	break;
	default:
	return -EINVAL;
	}

	return msb \| lsb;
	}


	static ssize_t __da9052_read_tsi(struct device *dev, int channel)
	{
	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	int ret;

	reinit_completion(&hwmon->tsidone);

	ret = da9052_request_tsi_read(hwmon, channel);
	if (ret < 0)
	return ret;

	/* Wait for an conversion done interrupt */
	if (!wait_for_completion_timeout(&hwmon->tsidone,
	msecs_to_jiffies(500)))
	return -ETIMEDOUT;

	return da9052_get_tsi_result(hwmon, channel);
	}

	static ssize_t da9052_tsi_show(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;

	mutex_lock(&hwmon->da9052->auxadc_lock);
	ret = __da9052_read_tsi(dev, channel);
	mutex_unlock(&hwmon->da9052->auxadc_lock);

	if (ret < 0)
	return ret;
	else
	return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
	}

	static ssize_t da9052_tjunc_show(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_vbbat_show(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 label_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	return sprintf(buf, "%s\n",
	input_names[to_sensor_dev_attr(devattr)->index]);
	}

	static umode_t da9052_channel_is_visible(struct kobject *kobj,
	struct attribute *attr, int index)
	{
	struct device *dev = kobj_to_dev(kobj);
	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	struct device_attribute *dattr = container_of(attr,
	struct device_attribute, attr);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);

	if (!hwmon->tsi_as_adc) {
	switch (sattr->index) {
	case DA9052_ADC_TSI_XP:
	case DA9052_ADC_TSI_YP:
	case DA9052_ADC_TSI_XN:
	case DA9052_ADC_TSI_YN:
	return 0;
	}
	}

	return attr->mode;
	}

	static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
	static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
	static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
	static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
	static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
	static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
	static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
	static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
	static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
	static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
	static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
	static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);

	static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
	static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
	static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
	static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
	static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
	static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
	static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
	static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);

	static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
	static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);

	static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
	static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
	static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
	static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);

	static struct attribute *da9052_attrs[] = {
	&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_in70_input.dev_attr.attr,
	&sensor_dev_attr_in70_label.dev_attr.attr,
	&sensor_dev_attr_in71_input.dev_attr.attr,
	&sensor_dev_attr_in71_label.dev_attr.attr,
	&sensor_dev_attr_in72_input.dev_attr.attr,
	&sensor_dev_attr_in72_label.dev_attr.attr,
	&sensor_dev_attr_in73_input.dev_attr.attr,
	&sensor_dev_attr_in73_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_group = {
	.attrs = da9052_attrs,
	.is_visible = da9052_channel_is_visible,
	};
	__ATTRIBUTE_GROUPS(da9052);

	static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
	{
	struct da9052_hwmon *hwmon = data;

	complete(&hwmon->tsidone);
	return IRQ_HANDLED;
	}

	static int da9052_hwmon_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct da9052_hwmon *hwmon;
	struct device *hwmon_dev;
	int err;

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

	platform_set_drvdata(pdev, hwmon);

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

	init_completion(&hwmon->tsidone);

	hwmon->tsi_as_adc =
	device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");

	if (hwmon->tsi_as_adc) {
	hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
	if (IS_ERR(hwmon->tsiref)) {
	err = PTR_ERR(hwmon->tsiref);
	dev_err(&pdev->dev, "failed to get tsiref: %d", err);
	return err;
	}

	err = regulator_enable(hwmon->tsiref);
	if (err)
	return err;

	hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
	if (hwmon->tsiref_mv < 0) {
	err = hwmon->tsiref_mv;
	goto exit_regulator;
	}

	/* convert from microvolt (DT) to millivolt (hwmon) */
	hwmon->tsiref_mv /= 1000;

	/* TSIREF limits from datasheet */
	if (hwmon->tsiref_mv < 1800 \|\| hwmon->tsiref_mv > 2600) {
	dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
	hwmon->tsiref_mv);
	err = -ENXIO;
	goto exit_regulator;
	}

	/* disable touchscreen features */
	da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);

	/* Sample every 1ms */
	da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
	DA9052_ADCCONT_ADCMODE,
	DA9052_ADCCONT_ADCMODE);

	err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
	"tsiready-irq", da9052_tsi_datardy_irq,
	hwmon);
	if (err) {
	dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
	err);
	goto exit_regulator;
	}
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
	hwmon,
	da9052_groups);
	err = PTR_ERR_OR_ZERO(hwmon_dev);
	if (err)
	goto exit_irq;

	return 0;

	exit_irq:
	if (hwmon->tsi_as_adc)
	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	exit_regulator:
	if (hwmon->tsiref)
	regulator_disable(hwmon->tsiref);

	return err;
	}

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

	if (hwmon->tsi_as_adc) {
	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	regulator_disable(hwmon->tsiref);
	}
	}

	static struct platform_driver da9052_hwmon_driver = {
	.probe = da9052_hwmon_probe,
	.remove_new = da9052_hwmon_remove,
	.driver = {
	.name = "da9052-hwmon",
	},
	};

	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");