[linux-2.6-block.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_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->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_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 = 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_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 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	}
e41f6432 AJ	89
6db587b7	90	static ssize_t da9052_vddout_show(struct device *dev,
e41f6432 AJ	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
6db587b7	122	static ssize_t da9052_ich_show(struct device *dev,
e41f6432 AJ	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
6db587b7	136	static ssize_t da9052_tbat_show(struct device *dev,
e41f6432 AJ	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
6db587b7	144	static ssize_t da9052_vbat_show(struct device *dev,
e41f6432 AJ	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	}
e41f6432 AJ	156
6db587b7	157	static ssize_t da9052_misc_channel_show(struct device *dev,
e41f6432 AJ	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
6db587b7 GR	245	static ssize_t da9052_tsi_show(struct device *dev,
6db587b7 GR	246	struct device_attribute devattr, char buf)
4f16cab1 SR	247	{
	248	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	249	int channel = to_sensor_dev_attr(devattr)->index;
	250	int ret;
	251
	252	mutex_lock(&hwmon->hwmon_lock);
	253	ret = __da9052_read_tsi(dev, channel);
	254	mutex_unlock(&hwmon->hwmon_lock);
	255
	256	if (ret < 0)
	257	return ret;
	258	else
	259	return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
	260	}
	261
6db587b7	262	static ssize_t da9052_tjunc_show(struct device *dev,
e41f6432 AJ	263	struct device_attribute devattr, char buf)
	264	{
	265	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	266	int tjunc;
	267	int toffset;
	268
	269	tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
	270	if (tjunc < 0)
	271	return tjunc;
	272
	273	toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
	274	if (toffset < 0)
	275	return toffset;
	276
	277	/*
	278	* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
	279	* T_OFFSET is a trim value used to improve accuracy of the result
	280	*/
	281	return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
	282	}
	283
6db587b7	284	static ssize_t da9052_vbbat_show(struct device *dev,
e41f6432 AJ	285	struct device_attribute devattr, char buf)
	286	{
	287	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	288	int ret;
	289
	290	ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
	291	if (ret < 0)
	292	return ret;
	293
088ce2ac	294	return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
e41f6432 AJ	295	}
e41f6432 AJ	296
6db587b7	297	static ssize_t label_show(struct device *dev,
e41f6432 AJ	298	struct device_attribute devattr, char buf)
	299	{
	300	return sprintf(buf, "%s\n",
	301	input_names[to_sensor_dev_attr(devattr)->index]);
	302	}
	303
4f16cab1 SR	304	static umode_t da9052_channel_is_visible(struct kobject *kobj,
	305	struct attribute *attr, int index)
	306	{
	307	struct device *dev = container_of(kobj, struct device, kobj);
	308	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
	309	struct device_attribute *dattr = container_of(attr,
	310	struct device_attribute, attr);
	311	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
	312
	313	if (!hwmon->tsi_as_adc) {
	314	switch (sattr->index) {
	315	case DA9052_ADC_TSI_XP:
	316	case DA9052_ADC_TSI_YP:
	317	case DA9052_ADC_TSI_XN:
	318	case DA9052_ADC_TSI_YN:
	319	return 0;
	320	}
	321	}
	322
	323	return attr->mode;
	324	}
	325
6db587b7 GR	326	static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
	327	static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
	328	static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
	329	static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
	330	static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
	331	static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
	332	static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
	333	static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
	334	static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
	335	static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
	336	static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
	337	static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);
	338
	339	static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
	340	static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
	341	static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
	342	static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
	343	static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
	344	static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
	345	static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
	346	static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);
	347
	348	static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
	349	static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);
	350
	351	static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
	352	static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
	353	static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
	354	static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);
e41f6432	355
4222eb5f	356	static struct attribute *da9052_attrs[] = {
e41f6432 AJ	357	&sensor_dev_attr_in0_input.dev_attr.attr,
	358	&sensor_dev_attr_in0_label.dev_attr.attr,
	359	&sensor_dev_attr_in3_input.dev_attr.attr,
	360	&sensor_dev_attr_in3_label.dev_attr.attr,
	361	&sensor_dev_attr_in4_input.dev_attr.attr,
	362	&sensor_dev_attr_in4_label.dev_attr.attr,
	363	&sensor_dev_attr_in5_input.dev_attr.attr,
	364	&sensor_dev_attr_in5_label.dev_attr.attr,
	365	&sensor_dev_attr_in6_input.dev_attr.attr,
	366	&sensor_dev_attr_in6_label.dev_attr.attr,
4f16cab1 SR	367	&sensor_dev_attr_in70_input.dev_attr.attr,
	368	&sensor_dev_attr_in70_label.dev_attr.attr,
	369	&sensor_dev_attr_in71_input.dev_attr.attr,
	370	&sensor_dev_attr_in71_label.dev_attr.attr,
	371	&sensor_dev_attr_in72_input.dev_attr.attr,
	372	&sensor_dev_attr_in72_label.dev_attr.attr,
	373	&sensor_dev_attr_in73_input.dev_attr.attr,
	374	&sensor_dev_attr_in73_label.dev_attr.attr,
e41f6432 AJ	375	&sensor_dev_attr_in9_input.dev_attr.attr,
	376	&sensor_dev_attr_in9_label.dev_attr.attr,
	377	&sensor_dev_attr_curr1_input.dev_attr.attr,
	378	&sensor_dev_attr_curr1_label.dev_attr.attr,
	379	&sensor_dev_attr_temp2_input.dev_attr.attr,
	380	&sensor_dev_attr_temp2_label.dev_attr.attr,
	381	&sensor_dev_attr_temp8_input.dev_attr.attr,
	382	&sensor_dev_attr_temp8_label.dev_attr.attr,
	383	NULL
	384	};
	385
4f16cab1 SR	386	static const struct attribute_group da9052_group = {
	387	.attrs = da9052_attrs,
	388	.is_visible = da9052_channel_is_visible,
	389	};
	390	__ATTRIBUTE_GROUPS(da9052);
	391
	392	static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
	393	{
	394	struct da9052_hwmon *hwmon = data;
	395
	396	complete(&hwmon->tsidone);
	397	return IRQ_HANDLED;
	398	}
e41f6432	399
6c931ae1	400	static int da9052_hwmon_probe(struct platform_device *pdev)
e41f6432	401	{
4222eb5f	402	struct device *dev = &pdev->dev;
e41f6432	403	struct da9052_hwmon *hwmon;
4222eb5f	404	struct device *hwmon_dev;
4f16cab1	405	int err;
e41f6432	406
4222eb5f	407	hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
e41f6432 AJ	408	if (!hwmon)
	409	return -ENOMEM;
	410
4f16cab1 SR	411	platform_set_drvdata(pdev, hwmon);
4f16cab1 SR	412
e41f6432 AJ	413	mutex_init(&hwmon->hwmon_lock);
	414	hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
	415
4f16cab1 SR	416	init_completion(&hwmon->tsidone);
	417
	418	hwmon->tsi_as_adc =
	419	device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
	420
	421	if (hwmon->tsi_as_adc) {
	422	hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
	423	if (IS_ERR(hwmon->tsiref)) {
	424	err = PTR_ERR(hwmon->tsiref);
	425	dev_err(&pdev->dev, "failed to get tsiref: %d", err);
	426	return err;
	427	}
	428
	429	err = regulator_enable(hwmon->tsiref);
	430	if (err)
	431	return err;
	432
	433	hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
	434	if (hwmon->tsiref_mv < 0) {
	435	err = hwmon->tsiref_mv;
	436	goto exit_regulator;
	437	}
	438
	439	/* convert from microvolt (DT) to millivolt (hwmon) */
	440	hwmon->tsiref_mv /= 1000;
	441
	442	/* TSIREF limits from datasheet */
	443	if (hwmon->tsiref_mv < 1800 \|\| hwmon->tsiref_mv > 2600) {
	444	dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
	445	hwmon->tsiref_mv);
	446	err = -ENXIO;
	447	goto exit_regulator;
	448	}
	449
	450	/* disable touchscreen features */
	451	da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
	452
b16918a5 MW	453	/* Sample every 1ms */
	454	da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
	455	DA9052_ADCCONT_ADCMODE,
	456	DA9052_ADCCONT_ADCMODE);
	457
4f16cab1 SR	458	err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
	459	"tsiready-irq", da9052_tsi_datardy_irq,
	460	hwmon);
	461	if (err) {
	462	dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
	463	err);
	464	goto exit_regulator;
	465	}
	466	}
	467
4222eb5f AL	468	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
	469	hwmon,
	470	da9052_groups);
4f16cab1 SR	471	err = PTR_ERR_OR_ZERO(hwmon_dev);
	472	if (err)
	473	goto exit_irq;
	474
	475	return 0;
	476
	477	exit_irq:
	478	if (hwmon->tsi_as_adc)
	479	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	480	exit_regulator:
	481	if (hwmon->tsiref)
	482	regulator_disable(hwmon->tsiref);
	483
	484	return err;
	485	}
	486
	487	static int da9052_hwmon_remove(struct platform_device *pdev)
	488	{
	489	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
	490
	491	if (hwmon->tsi_as_adc) {
	492	da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
	493	regulator_disable(hwmon->tsiref);
	494	}
	495
	496	return 0;
e41f6432 AJ	497	}
	498
	499	static struct platform_driver da9052_hwmon_driver = {
	500	.probe = da9052_hwmon_probe,
4f16cab1	501	.remove = da9052_hwmon_remove,
e41f6432 AJ	502	.driver = {
e41f6432 AJ	503	.name = "da9052-hwmon",
e41f6432 AJ	504	},
	505	};
	506
	507	module_platform_driver(da9052_hwmon_driver);
	508
	509	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	510	MODULE_DESCRIPTION("DA9052 HWMON driver");
	511	MODULE_LICENSE("GPL");
	512	MODULE_ALIAS("platform:da9052-hwmon");