[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / da9052-hwmon.c

/*
 * 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/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_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 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_read_tsi(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->hwmon_lock);
	ret = __da9052_read_tsi(dev, channel);
	mutex_unlock(&hwmon->hwmon_lock);

	if (ret < 0)
		return ret;
	else
		return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, 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 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 umode_t da9052_channel_is_visible(struct kobject *kobj,
					 struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, 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(in0_input, 0444, da9052_read_vddout, NULL,
			  DA9052_ADC_VDDOUT);
static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
			  DA9052_ADC_VDDOUT);
static SENSOR_DEVICE_ATTR(in3_input, 0444, da9052_read_vbat, NULL,
			  DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in3_label, 0444, show_label, NULL,
			  DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in4_input, 0444, da9052_read_misc_channel, NULL,
			  DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in4_label, 0444, show_label, NULL,
			  DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in5_input, 0444, da9052_read_misc_channel, NULL,
			  DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in5_label, 0444, show_label, NULL,
			  DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in6_input, 0444, da9052_read_misc_channel, NULL,
			  DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in6_label, 0444, show_label, NULL,
			  DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
			  DA9052_ADC_VBBAT);
static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
			  DA9052_ADC_VBBAT);

static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
			  DA9052_ADC_TSI_XP);
static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
			  DA9052_ADC_TSI_XP);
static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
			  DA9052_ADC_TSI_XN);
static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
			  DA9052_ADC_TSI_XN);
static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
			  DA9052_ADC_TSI_YP);
static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
			  DA9052_ADC_TSI_YP);
static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
			  DA9052_ADC_TSI_YN);
static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
			  DA9052_ADC_TSI_YN);

static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
			  DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
			  DA9052_ADC_ICH);

static SENSOR_DEVICE_ATTR(temp2_input, 0444, da9052_read_tbat, NULL,
			  DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL,
			  DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp8_input, 0444, da9052_read_tjunc, NULL,
			  DA9052_ADC_TJUNC);
static SENSOR_DEVICE_ATTR(temp8_label, 0444, show_label, NULL,
			  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 int 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);
	}

	return 0;
}

static struct platform_driver da9052_hwmon_driver = {
	.probe = da9052_hwmon_probe,
	.remove = 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");
Commit	Line	Data
e41f6432 AJ	1	/*
	2	* HWMON Driver for Dialog DA9052
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
e41f6432 AJ	15	#include <linux/err.h>
	16	#include <linux/hwmon.h>
	17	#include <linux/hwmon-sysfs.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/slab.h>
	22	#include <linux/platform_device.h>
4f16cab1	23	#include <linux/property.h>
e41f6432 AJ	24
	25	#include <linux/mfd/da9052/da9052.h>
	26	#include <linux/mfd/da9052/reg.h>
4f16cab1	27	#include <linux/regulator/consumer.h>
e41f6432 AJ	28
e41f6432 AJ	29	struct da9052_hwmon {
4f16cab1 SR	30	struct da9052 *da9052;
	31	struct mutex hwmon_lock;
	32	bool tsi_as_adc;
	33	int tsiref_mv;
	34	struct regulator *tsiref;
	35	struct completion tsidone;
e41f6432 AJ	36	};
	37
	38	static const char * const input_names[] = {
	39	[DA9052_ADC_VDDOUT] = "VDDOUT",
	40	[DA9052_ADC_ICH] = "CHARGING CURRENT",
	41	[DA9052_ADC_TBAT] = "BATTERY TEMP",
	42	[DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
	43	[DA9052_ADC_IN4] = "ADC IN4",
	44	[DA9052_ADC_IN5] = "ADC IN5",
	45	[DA9052_ADC_IN6] = "ADC IN6",
4f16cab1 SR	46	[DA9052_ADC_TSI_XP] = "ADC TS X+",
	47	[DA9052_ADC_TSI_YP] = "ADC TS Y+",
	48	[DA9052_ADC_TSI_XN] = "ADC TS X-",
	49	[DA9052_ADC_TSI_YN] = "ADC TS Y-",
e41f6432 AJ	50	[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
	51	[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
	52	};
	53
	54	/* Conversion function for VDDOUT and VBAT */
088ce2ac	55	static inline int volt_reg_to_mv(int value)
e41f6432	56	{
c09088d9	57	return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
e41f6432 AJ	58	}
	59
	60	/* Conversion function for ADC channels 4, 5 and 6 */
088ce2ac	61	static inline int input_reg_to_mv(int value)
e41f6432 AJ	62	{
	63	return DIV_ROUND_CLOSEST(value * 2500, 1023);
	64	}
	65
	66	/* Conversion function for VBBAT */
088ce2ac	67	static inline int vbbat_reg_to_mv(int value)
e41f6432	68	{
c09088d9	69	return DIV_ROUND_CLOSEST(value * 5000, 1023);
e41f6432 AJ	70	}
e41f6432 AJ	71
4f16cab1 SR	72	static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
	73	{
	74	return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
	75	}
	76
d9b24e37	77	static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
e41f6432	78	{
d9b24e37 AL	79	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
	80	DA9052_ADCCONT_AUTOVDDEN,
	81	DA9052_ADCCONT_AUTOVDDEN);
e41f6432 AJ	82	}
e41f6432 AJ	83
d9b24e37	84	static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
e41f6432	85	{
d9b24e37 AL	86	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
d9b24e37 AL	87	DA9052_ADCCONT_AUTOVDDEN, 0);
e41f6432 AJ	88	}
	89
	90	static ssize_t da9052_read_vddout(struct device *dev,
	91	struct device_attribute devattr, char buf)
	92	{
	93	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	94	int ret, vdd;
	95
	96	mutex_lock(&hwmon->hwmon_lock);
	97
	98	ret = da9052_enable_vddout_channel(hwmon->da9052);
	99	if (ret < 0)
	100	goto hwmon_err;
	101
	102	vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
	103	if (vdd < 0) {
	104	ret = vdd;
	105	goto hwmon_err_release;
	106	}
	107
	108	ret = da9052_disable_vddout_channel(hwmon->da9052);
	109	if (ret < 0)
	110	goto hwmon_err;
	111
	112	mutex_unlock(&hwmon->hwmon_lock);
088ce2ac	113	return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
e41f6432 AJ	114
	115	hwmon_err_release:
	116	da9052_disable_vddout_channel(hwmon->da9052);
	117	hwmon_err:
	118	mutex_unlock(&hwmon->hwmon_lock);
	119	return ret;
	120	}
	121
	122	static ssize_t da9052_read_ich(struct device *dev,
	123	struct device_attribute devattr, char buf)
	124	{
	125	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	126	int ret;
	127
	128	ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
	129	if (ret < 0)
	130	return ret;
	131
	132	/* Equivalent to 3.9mA/bit in register ICHG_AV */
	133	return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
	134	}
	135
	136	static ssize_t da9052_read_tbat(struct device *dev,
	137	struct device_attribute devattr, char buf)
	138	{
	139	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	140
	141	return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
	142	}
	143
	144	static ssize_t da9052_read_vbat(struct device *dev,
	145	struct device_attribute devattr, char buf)
	146	{
	147	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	148	int ret;
	149
	150	ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
	151	if (ret < 0)
	152	return ret;
	153
088ce2ac	154	return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
e41f6432 AJ	155	}
	156
	157	static ssize_t da9052_read_misc_channel(struct device *dev,
	158	struct device_attribute *devattr,
	159	char *buf)
	160	{
	161	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	162	int channel = to_sensor_dev_attr(devattr)->index;
	163	int ret;
	164
	165	ret = da9052_adc_manual_read(hwmon->da9052, channel);
	166	if (ret < 0)
	167	return ret;
	168
088ce2ac	169	return sprintf(buf, "%d\n", input_reg_to_mv(ret));
e41f6432 AJ	170	}
e41f6432 AJ	171
4f16cab1 SR	172	static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
	173	{
	174	u8 val = DA9052_TSICONTB_TSIMAN;
	175
	176	switch (channel) {
	177	case DA9052_ADC_TSI_XP:
	178	val \|= DA9052_TSICONTB_TSIMUX_XP;
	179	break;
	180	case DA9052_ADC_TSI_YP:
	181	val \|= DA9052_TSICONTB_TSIMUX_YP;
	182	break;
	183	case DA9052_ADC_TSI_XN:
	184	val \|= DA9052_TSICONTB_TSIMUX_XN;
	185	break;
	186	case DA9052_ADC_TSI_YN:
	187	val \|= DA9052_TSICONTB_TSIMUX_YN;
	188	break;
	189	}
	190
	191	return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
	192	}
	193
	194	static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
	195	{
	196	u8 regs[3];
	197	int msb, lsb, err;
	198
	199	/* block read to avoid separation of MSB and LSB */
	200	err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
	201	ARRAY_SIZE(regs), regs);
	202	if (err)
	203	return err;
	204
	205	switch (channel) {
	206	case DA9052_ADC_TSI_XP:
	207	case DA9052_ADC_TSI_XN:
	208	msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
	209	lsb = regs[2] & DA9052_TSILSB_TSIXL;
	210	lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
	211	break;
	212	case DA9052_ADC_TSI_YP:
	213	case DA9052_ADC_TSI_YN:
	214	msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
	215	lsb = regs[2] & DA9052_TSILSB_TSIYL;
	216	lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
	217	break;
	218	default:
	219	return -EINVAL;
	220	}
	221
	222	return msb \| lsb;
	223	}
	224
	225
	226	static ssize_t __da9052_read_tsi(struct device *dev, int channel)
	227	{
	228	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	229	int ret;
	230
	231	reinit_completion(&hwmon->tsidone);
	232
	233	ret = da9052_request_tsi_read(hwmon, channel);
	234	if (ret < 0)
	235	return ret;
236
237	/* Wait for an conversion done interrupt */
238	if (!wait_for_completion_timeout(&hwmon->tsidone,
239	msecs_to_jiffies(500)))
240	return -ETIMEDOUT;
241
242	return da9052_get_tsi_result(hwmon, channel);
243	}
244
245	static ssize_t da9052_read_tsi(struct device *dev,
246	struct device_attribute *devattr,
247	char *buf)
248	{
249	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
250	int channel = to_sensor_dev_attr(devattr)->index;
251	int ret;
252
253	mutex_lock(&hwmon->hwmon_lock);
254	ret = __da9052_read_tsi(dev, channel);
255	mutex_unlock(&hwmon->hwmon_lock);
256
257	if (ret < 0)
258	return ret;
259	else
260	return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
261	}
262
e41f6432 AJ	263	static ssize_t da9052_read_tjunc(struct device *dev,
	264	struct device_attribute devattr, char buf)
	265	{
	266	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	267	int tjunc;
	268	int toffset;
	269
	270	tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
	271	if (tjunc < 0)
	272	return tjunc;
	273
	274	toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
	275	if (toffset < 0)
	276	return toffset;
	277
	278	/*
	279	* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
	280	* T_OFFSET is a trim value used to improve accuracy of the result
	281	*/
	282	return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
	283	}
	284
	285	static ssize_t da9052_read_vbbat(struct device *dev,
	286	struct device_attribute devattr, char buf)
	287	{
	288	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	289	int ret;
	290
	291	ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
	292	if (ret < 0)
	293	return ret;
	294
088ce2ac	295	return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
e41f6432 AJ	296	}
e41f6432 AJ	297
e41f6432 AJ	298	static ssize_t show_label(struct device *dev,
	299	struct device_attribute devattr, char buf)
	300	{
	301	return sprintf(buf, "%s\n",
	302	input_names[to_sensor_dev_attr(devattr)->index]);
	303	}
	304
4f16cab1 SR	305	static umode_t da9052_channel_is_visible(struct kobject *kobj,
	306	struct attribute *attr, int index)
	307	{
	308	struct device *dev = container_of(kobj, struct device, kobj);
	309	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	310	struct device_attribute *dattr = container_of(attr,
	311	struct device_attribute, attr);
	312	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
	313
	314	if (!hwmon->tsi_as_adc) {
	315	switch (sattr->index) {
	316	case DA9052_ADC_TSI_XP:
	317	case DA9052_ADC_TSI_YP:
	318	case DA9052_ADC_TSI_XN:
	319	case DA9052_ADC_TSI_YN:
	320	return 0;
	321	}
	322	}
	323
	324	return attr->mode;
	325	}
	326
7fe9899e	327	static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
e41f6432	328	DA9052_ADC_VDDOUT);
7fe9899e	329	static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
e41f6432	330	DA9052_ADC_VDDOUT);
7fe9899e	331	static SENSOR_DEVICE_ATTR(in3_input, 0444, da9052_read_vbat, NULL,
e41f6432	332	DA9052_ADC_VBAT);
7fe9899e	333	static SENSOR_DEVICE_ATTR(in3_label, 0444, show_label, NULL,
e41f6432	334	DA9052_ADC_VBAT);
7fe9899e	335	static SENSOR_DEVICE_ATTR(in4_input, 0444, da9052_read_misc_channel, NULL,
e41f6432	336	DA9052_ADC_IN4);
7fe9899e	337	static SENSOR_DEVICE_ATTR(in4_label, 0444, show_label, NULL,
e41f6432	338	DA9052_ADC_IN4);
7fe9899e	339	static SENSOR_DEVICE_ATTR(in5_input, 0444, da9052_read_misc_channel, NULL,
e41f6432	340	DA9052_ADC_IN5);
7fe9899e	341	static SENSOR_DEVICE_ATTR(in5_label, 0444, show_label, NULL,
e41f6432	342	DA9052_ADC_IN5);
7fe9899e	343	static SENSOR_DEVICE_ATTR(in6_input, 0444, da9052_read_misc_channel, NULL,
e41f6432	344	DA9052_ADC_IN6);
7fe9899e	345	static SENSOR_DEVICE_ATTR(in6_label, 0444, show_label, NULL,
e41f6432	346	DA9052_ADC_IN6);
7fe9899e	347	static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
e41f6432	348	DA9052_ADC_VBBAT);
7fe9899e	349	static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
e41f6432 AJ	350	DA9052_ADC_VBBAT);
e41f6432 AJ	351
4f16cab1 SR	352	static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
	353	DA9052_ADC_TSI_XP);
	354	static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
	355	DA9052_ADC_TSI_XP);
	356	static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
	357	DA9052_ADC_TSI_XN);
	358	static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
	359	DA9052_ADC_TSI_XN);
	360	static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
	361	DA9052_ADC_TSI_YP);
	362	static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
	363	DA9052_ADC_TSI_YP);
	364	static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
	365	DA9052_ADC_TSI_YN);
	366	static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
	367	DA9052_ADC_TSI_YN);
	368
7fe9899e	369	static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
e41f6432	370	DA9052_ADC_ICH);
7fe9899e	371	static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
e41f6432 AJ	372	DA9052_ADC_ICH);
e41f6432 AJ	373
7fe9899e	374	static SENSOR_DEVICE_ATTR(temp2_input, 0444, da9052_read_tbat, NULL,
e41f6432	375	DA9052_ADC_TBAT);
7fe9899e	376	static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL,
e41f6432	377	DA9052_ADC_TBAT);
7fe9899e	378	static SENSOR_DEVICE_ATTR(temp8_input, 0444, da9052_read_tjunc, NULL,
e41f6432	379	DA9052_ADC_TJUNC);
7fe9899e	380	static SENSOR_DEVICE_ATTR(temp8_label, 0444, show_label, NULL,
e41f6432 AJ	381	DA9052_ADC_TJUNC);
e41f6432 AJ	382
4222eb5f	383	static struct attribute *da9052_attrs[] = {
e41f6432 AJ	384	&sensor_dev_attr_in0_input.dev_attr.attr,
	385	&sensor_dev_attr_in0_label.dev_attr.attr,
	386	&sensor_dev_attr_in3_input.dev_attr.attr,
	387	&sensor_dev_attr_in3_label.dev_attr.attr,
	388	&sensor_dev_attr_in4_input.dev_attr.attr,
	389	&sensor_dev_attr_in4_label.dev_attr.attr,
	390	&sensor_dev_attr_in5_input.dev_attr.attr,
	391	&sensor_dev_attr_in5_label.dev_attr.attr,
	392	&sensor_dev_attr_in6_input.dev_attr.attr,
	393	&sensor_dev_attr_in6_label.dev_attr.attr,
4f16cab1 SR	394	&sensor_dev_attr_in70_input.dev_attr.attr,
	395	&sensor_dev_attr_in70_label.dev_attr.attr,
	396	&sensor_dev_attr_in71_input.dev_attr.attr,
	397	&sensor_dev_attr_in71_label.dev_attr.attr,
	398	&sensor_dev_attr_in72_input.dev_attr.attr,
	399	&sensor_dev_attr_in72_label.dev_attr.attr,
	400	&sensor_dev_attr_in73_input.dev_attr.attr,
	401	&sensor_dev_attr_in73_label.dev_attr.attr,
e41f6432 AJ	402	&sensor_dev_attr_in9_input.dev_attr.attr,
	403	&sensor_dev_attr_in9_label.dev_attr.attr,
	404	&sensor_dev_attr_curr1_input.dev_attr.attr,
	405	&sensor_dev_attr_curr1_label.dev_attr.attr,
	406	&sensor_dev_attr_temp2_input.dev_attr.attr,
	407	&sensor_dev_attr_temp2_label.dev_attr.attr,
	408	&sensor_dev_attr_temp8_input.dev_attr.attr,
	409	&sensor_dev_attr_temp8_label.dev_attr.attr,
	410	NULL
	411	};
	412
4f16cab1 SR	413	static const struct attribute_group da9052_group = {
	414	.attrs = da9052_attrs,
	415	.is_visible = da9052_channel_is_visible,
	416	};
	417	__ATTRIBUTE_GROUPS(da9052);
	418
	419	static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
	420	{
	421	struct da9052_hwmon *hwmon = data;
	422
	423	complete(&hwmon->tsidone);
	424	return IRQ_HANDLED;
	425	}
e41f6432	426
6c931ae1	427	static int da9052_hwmon_probe(struct platform_device *pdev)
e41f6432	428	{
4222eb5f	429	struct device *dev = &pdev->dev;
e41f6432	430	struct da9052_hwmon *hwmon;
4222eb5f	431	struct device *hwmon_dev;
4f16cab1	432	int err;
e41f6432	433
4222eb5f	434	hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
e41f6432 AJ	435	if (!hwmon)
	436	return -ENOMEM;
	437
4f16cab1 SR	438	platform_set_drvdata(pdev, hwmon);
4f16cab1 SR	439
e41f6432 AJ	440	mutex_init(&hwmon->hwmon_lock);
	441	hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
	442
4f16cab1 SR	443	init_completion(&hwmon->tsidone);
	444
	445	hwmon->tsi_as_adc =
	446	device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
	447
	448	if (hwmon->tsi_as_adc) {
	449	hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
	450	if (IS_ERR(hwmon->tsiref)) {
	451	err = PTR_ERR(hwmon->tsiref);
	452	dev_err(&pdev->dev, "failed to get tsiref: %d", err);
	453	return err;
	454	}
	455
	456	err = regulator_enable(hwmon->tsiref);
	457	if (err)
	458	return err;
	459
	460	hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
	461	if (hwmon->tsiref_mv < 0) {
	462	err = hwmon->tsiref_mv;
	463	goto exit_regulator;
	464	}
	465
	466	/* convert from microvolt (DT) to millivolt (hwmon) */
	467	hwmon->tsiref_mv /= 1000;
	468
	469	/* TSIREF limits from datasheet */
	470	if (hwmon->tsiref_mv < 1800 \|\| hwmon->tsiref_mv > 2600) {
	471	dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
	472	hwmon->tsiref_mv);
	473	err = -ENXIO;
	474	goto exit_regulator;
	475	}
	476
	477	/* disable touchscreen features */
	478	da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
	479
b16918a5 MW	480	/* Sample every 1ms */
	481	da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
	482	DA9052_ADCCONT_ADCMODE,
	483	DA9052_ADCCONT_ADCMODE);
	484
4f16cab1 SR	485	err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
	486	"tsiready-irq", da9052_tsi_datardy_irq,
	487	hwmon);
	488	if (err) {
	489	dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
	490	err);
	491	goto exit_regulator;
	492	}
	493	}
	494
4222eb5f AL	495	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
	496	hwmon,
	497	da9052_groups);
4f16cab1 SR	498	err = PTR_ERR_OR_ZERO(hwmon_dev);
	499	if (err)
	500	goto exit_irq;
	501
	502	return 0;
	503
	504	exit_irq:
	505	if (hwmon->tsi_as_adc)
	506	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	507	exit_regulator:
	508	if (hwmon->tsiref)
	509	regulator_disable(hwmon->tsiref);
	510
	511	return err;
	512	}
	513
	514	static int da9052_hwmon_remove(struct platform_device *pdev)
	515	{
	516	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
	517
	518	if (hwmon->tsi_as_adc) {
	519	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	520	regulator_disable(hwmon->tsiref);
	521	}
	522
	523	return 0;
e41f6432 AJ	524	}
	525
	526	static struct platform_driver da9052_hwmon_driver = {
	527	.probe = da9052_hwmon_probe,
4f16cab1	528	.remove = da9052_hwmon_remove,
e41f6432 AJ	529	.driver = {
e41f6432 AJ	530	.name = "da9052-hwmon",
e41f6432 AJ	531	},
	532	};
	533
	534	module_platform_driver(da9052_hwmon_driver);
	535
	536	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	537	MODULE_DESCRIPTION("DA9052 HWMON driver");
	538	MODULE_LICENSE("GPL");
	539	MODULE_ALIAS("platform:da9052-hwmon");