[linux-2.6-block.git] / drivers / hwmon / adc128d818.c

/*
 * Driver for TI ADC128D818 System Monitor with Temperature Sensor
 *
 * Copyright (c) 2014 Guenter Roeck
 *
 * Derived from lm80.c
 * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
 *			     and Philip Edelbrock <phil@netroedge.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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/bitops.h>
#include <linux/of.h>

/* Addresses to scan
 * The chip also supports addresses 0x35..0x37. Don't scan those addresses
 * since they are also used by some EEPROMs, which may result in false
 * positives.
 */
static const unsigned short normal_i2c[] = {
	0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* registers */
#define ADC128_REG_IN_MAX(nr)		(0x2a + (nr) * 2)
#define ADC128_REG_IN_MIN(nr)		(0x2b + (nr) * 2)
#define ADC128_REG_IN(nr)		(0x20 + (nr))

#define ADC128_REG_TEMP			0x27
#define ADC128_REG_TEMP_MAX		0x38
#define ADC128_REG_TEMP_HYST		0x39

#define ADC128_REG_CONFIG		0x00
#define ADC128_REG_ALARM		0x01
#define ADC128_REG_MASK			0x03
#define ADC128_REG_CONV_RATE		0x07
#define ADC128_REG_ONESHOT		0x09
#define ADC128_REG_SHUTDOWN		0x0a
#define ADC128_REG_CONFIG_ADV		0x0b
#define ADC128_REG_BUSY_STATUS		0x0c

#define ADC128_REG_MAN_ID		0x3e
#define ADC128_REG_DEV_ID		0x3f

/* No. of voltage entries in adc128_attrs */
#define ADC128_ATTR_NUM_VOLT		(8 * 4)

/* Voltage inputs visible per operation mode */
static const u8 num_inputs[] = { 7, 8, 4, 6 };

struct adc128_data {
	struct i2c_client *client;
	struct regulator *regulator;
	int vref;		/* Reference voltage in mV */
	struct mutex update_lock;
	u8 mode;		/* Operation mode */
	bool valid;		/* true if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u16 in[3][8];		/* Register value, normalized to 12 bit
				 * 0: input voltage
				 * 1: min limit
				 * 2: max limit
				 */
	s16 temp[3];		/* Register value, normalized to 9 bit
				 * 0: sensor 1: limit 2: hyst
				 */
	u8 alarms;		/* alarm register value */
};

static struct adc128_data *adc128_update_device(struct device *dev)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	struct adc128_data *ret = data;
	int i, rv;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		for (i = 0; i < num_inputs[data->mode]; i++) {
			rv = i2c_smbus_read_word_swapped(client,
							 ADC128_REG_IN(i));
			if (rv < 0)
				goto abort;
			data->in[0][i] = rv >> 4;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_IN_MIN(i));
			if (rv < 0)
				goto abort;
			data->in[1][i] = rv << 4;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_IN_MAX(i));
			if (rv < 0)
				goto abort;
			data->in[2][i] = rv << 4;
		}

		if (data->mode != 1) {
			rv = i2c_smbus_read_word_swapped(client,
							 ADC128_REG_TEMP);
			if (rv < 0)
				goto abort;
			data->temp[0] = rv >> 7;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_TEMP_MAX);
			if (rv < 0)
				goto abort;
			data->temp[1] = rv << 1;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_TEMP_HYST);
			if (rv < 0)
				goto abort;
			data->temp[2] = rv << 1;
		}

		rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
		if (rv < 0)
			goto abort;
		data->alarms |= rv;

		data->last_updated = jiffies;
		data->valid = true;
	}
	goto done;

abort:
	ret = ERR_PTR(rv);
	data->valid = false;
done:
	mutex_unlock(&data->update_lock);
	return ret;
}

static ssize_t adc128_in_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int index = to_sensor_dev_attr_2(attr)->index;
	int nr = to_sensor_dev_attr_2(attr)->nr;
	int val;

	if (IS_ERR(data))
		return PTR_ERR(data);

	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
	return sprintf(buf, "%d\n", val);
}

static ssize_t adc128_in_store(struct device *dev,
			       struct device_attribute *attr, const char *buf,
			       size_t count)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr_2(attr)->index;
	int nr = to_sensor_dev_attr_2(attr)->nr;
	u8 reg, regval;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	/* 10 mV LSB on limit registers */
	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
	data->in[index][nr] = regval << 4;
	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
	i2c_smbus_write_byte_data(data->client, reg, regval);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t adc128_temp_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;
	int temp;

	if (IS_ERR(data))
		return PTR_ERR(data);

	temp = sign_extend32(data->temp[index], 8);
	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
}

static ssize_t adc128_temp_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	long val;
	int err;
	s8 regval;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	data->temp[index] = regval << 1;
	i2c_smbus_write_byte_data(data->client,
				  index == 1 ? ADC128_REG_TEMP_MAX
					     : ADC128_REG_TEMP_HYST,
				  regval);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t adc128_alarm_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int mask = 1 << to_sensor_dev_attr(attr)->index;
	u8 alarms;

	if (IS_ERR(data))
		return PTR_ERR(data);

	/*
	 * Clear an alarm after reporting it to user space. If it is still
	 * active, the next update sequence will set the alarm bit again.
	 */
	alarms = data->alarms;
	data->alarms &= ~mask;

	return sprintf(buf, "%u\n", !!(alarms & mask));
}

static umode_t adc128_is_visible(struct kobject *kobj,
				 struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct adc128_data *data = dev_get_drvdata(dev);

	if (index < ADC128_ATTR_NUM_VOLT) {
		/* Voltage, visible according to num_inputs[] */
		if (index >= num_inputs[data->mode] * 4)
			return 0;
	} else {
		/* Temperature, visible if not in mode 1 */
		if (data->mode == 1)
			return 0;
	}

	return attr->mode;
}

static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);

static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);

static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);

static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);

static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);

static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);

static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);

static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);

static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);

static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);

static struct attribute *adc128_attrs[] = {
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,
	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in7_max.dev_attr.attr,
	&sensor_dev_attr_in7_min.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	NULL
};

static const struct attribute_group adc128_group = {
	.attrs = adc128_attrs,
	.is_visible = adc128_is_visible,
};
__ATTRIBUTE_GROUPS(adc128);

static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
{
	int man_id, dev_id;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
	if (man_id != 0x01 || dev_id != 0x09)
		return -ENODEV;

	/* Check unused bits for confirmation */
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
		return -ENODEV;

	strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);

	return 0;
}

static int adc128_init_client(struct adc128_data *data)
{
	struct i2c_client *client = data->client;
	int err;

	/*
	 * Reset chip to defaults.
	 * This makes most other initializations unnecessary.
	 */
	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
	if (err)
		return err;

	/* Set operation mode, if non-default */
	if (data->mode != 0) {
		err = i2c_smbus_write_byte_data(client,
						ADC128_REG_CONFIG_ADV,
						data->mode << 1);
		if (err)
			return err;
	}

	/* Start monitoring */
	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
	if (err)
		return err;

	/* If external vref is selected, configure the chip to use it */
	if (data->regulator) {
		err = i2c_smbus_write_byte_data(client,
						ADC128_REG_CONFIG_ADV, 0x01);
		if (err)
			return err;
	}

	return 0;
}

static int adc128_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct regulator *regulator;
	struct device *hwmon_dev;
	struct adc128_data *data;
	int err, vref;

	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* vref is optional. If specified, is used as chip reference voltage */
	regulator = devm_regulator_get_optional(dev, "vref");
	if (!IS_ERR(regulator)) {
		data->regulator = regulator;
		err = regulator_enable(regulator);
		if (err < 0)
			return err;
		vref = regulator_get_voltage(regulator);
		if (vref < 0) {
			err = vref;
			goto error;
		}
		data->vref = DIV_ROUND_CLOSEST(vref, 1000);
	} else {
		data->vref = 2560;	/* 2.56V, in mV */
	}

	/* Operation mode is optional. If unspecified, keep current mode */
	if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
		if (data->mode > 3) {
			dev_err(dev, "invalid operation mode %d\n",
				data->mode);
			err = -EINVAL;
			goto error;
		}
	} else {
		err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
		if (err < 0)
			goto error;
		data->mode = (err >> 1) & ADC128_REG_MASK;
	}

	data->client = client;
	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* Initialize the chip */
	err = adc128_init_client(data);
	if (err < 0)
		goto error;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data, adc128_groups);
	if (IS_ERR(hwmon_dev)) {
		err = PTR_ERR(hwmon_dev);
		goto error;
	}

	return 0;

error:
	if (data->regulator)
		regulator_disable(data->regulator);
	return err;
}

static int adc128_remove(struct i2c_client *client)
{
	struct adc128_data *data = i2c_get_clientdata(client);

	if (data->regulator)
		regulator_disable(data->regulator);

	return 0;
}

static const struct i2c_device_id adc128_id[] = {
	{ "adc128d818", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adc128_id);

static const struct of_device_id adc128_of_match[] = {
	{ .compatible = "ti,adc128d818" },
	{ },
};
MODULE_DEVICE_TABLE(of, adc128_of_match);

static struct i2c_driver adc128_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "adc128d818",
		.of_match_table = of_match_ptr(adc128_of_match),
	},
	.probe		= adc128_probe,
	.remove		= adc128_remove,
	.id_table	= adc128_id,
	.detect		= adc128_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(adc128_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("Driver for ADC128D818");
MODULE_LICENSE("GPL");
Commit	Line	Data
b4c9c1a7 GR	1	/*
	2	* Driver for TI ADC128D818 System Monitor with Temperature Sensor
	3	*
	4	* Copyright (c) 2014 Guenter Roeck
	5	*
	6	* Derived from lm80.c
	7	* Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
	8	* and Philip Edelbrock <phil@netroedge.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/jiffies.h>
	24	#include <linux/i2c.h>
	25	#include <linux/hwmon.h>
	26	#include <linux/hwmon-sysfs.h>
	27	#include <linux/err.h>
	28	#include <linux/regulator/consumer.h>
	29	#include <linux/mutex.h>
2c3b1189	30	#include <linux/bitops.h>
a45923c2	31	#include <linux/of.h>
b4c9c1a7 GR	32
	33	/* Addresses to scan
	34	* The chip also supports addresses 0x35..0x37. Don't scan those addresses
	35	* since they are also used by some EEPROMs, which may result in false
	36	* positives.
	37	*/
	38	static const unsigned short normal_i2c[] = {
	39	0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
	40
	41	/* registers */
	42	#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
	43	#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
	44	#define ADC128_REG_IN(nr) (0x20 + (nr))
	45
	46	#define ADC128_REG_TEMP 0x27
	47	#define ADC128_REG_TEMP_MAX 0x38
	48	#define ADC128_REG_TEMP_HYST 0x39
	49
	50	#define ADC128_REG_CONFIG 0x00
	51	#define ADC128_REG_ALARM 0x01
	52	#define ADC128_REG_MASK 0x03
	53	#define ADC128_REG_CONV_RATE 0x07
	54	#define ADC128_REG_ONESHOT 0x09
	55	#define ADC128_REG_SHUTDOWN 0x0a
	56	#define ADC128_REG_CONFIG_ADV 0x0b
	57	#define ADC128_REG_BUSY_STATUS 0x0c
	58
	59	#define ADC128_REG_MAN_ID 0x3e
	60	#define ADC128_REG_DEV_ID 0x3f
	61
4e1796c8 AK	62	/* No. of voltage entries in adc128_attrs */
	63	#define ADC128_ATTR_NUM_VOLT (8 * 4)
	64
	65	/* Voltage inputs visible per operation mode */
	66	static const u8 num_inputs[] = { 7, 8, 4, 6 };
	67
b4c9c1a7 GR	68	struct adc128_data {
	69	struct i2c_client *client;
	70	struct regulator *regulator;
	71	int vref; /* Reference voltage in mV */
	72	struct mutex update_lock;
a45923c2	73	u8 mode; /* Operation mode */
b4c9c1a7 GR	74	bool valid; /* true if following fields are valid */
	75	unsigned long last_updated; /* In jiffies */
	76
4e1796c8	77	u16 in[3][8]; /* Register value, normalized to 12 bit
b4c9c1a7 GR	78	* 0: input voltage
	79	* 1: min limit
	80	* 2: max limit
	81	*/
	82	s16 temp[3]; /* Register value, normalized to 9 bit
	83	* 0: sensor 1: limit 2: hyst
	84	*/
	85	u8 alarms; /* alarm register value */
	86	};
	87
	88	static struct adc128_data adc128_update_device(struct device dev)
	89	{
	90	struct adc128_data *data = dev_get_drvdata(dev);
	91	struct i2c_client *client = data->client;
	92	struct adc128_data *ret = data;
	93	int i, rv;
	94
	95	mutex_lock(&data->update_lock);
	96
	97	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
4e1796c8	98	for (i = 0; i < num_inputs[data->mode]; i++) {
b4c9c1a7 GR	99	rv = i2c_smbus_read_word_swapped(client,
	100	ADC128_REG_IN(i));
	101	if (rv < 0)
	102	goto abort;
	103	data->in[0][i] = rv >> 4;
	104
	105	rv = i2c_smbus_read_byte_data(client,
	106	ADC128_REG_IN_MIN(i));
	107	if (rv < 0)
	108	goto abort;
	109	data->in[1][i] = rv << 4;
	110
	111	rv = i2c_smbus_read_byte_data(client,
	112	ADC128_REG_IN_MAX(i));
	113	if (rv < 0)
	114	goto abort;
	115	data->in[2][i] = rv << 4;
	116	}
	117
4e1796c8 AK	118	if (data->mode != 1) {
	119	rv = i2c_smbus_read_word_swapped(client,
	120	ADC128_REG_TEMP);
	121	if (rv < 0)
	122	goto abort;
	123	data->temp[0] = rv >> 7;
b4c9c1a7	124
4e1796c8 AK	125	rv = i2c_smbus_read_byte_data(client,
	126	ADC128_REG_TEMP_MAX);
	127	if (rv < 0)
	128	goto abort;
	129	data->temp[1] = rv << 1;
b4c9c1a7	130
4e1796c8 AK	131	rv = i2c_smbus_read_byte_data(client,
	132	ADC128_REG_TEMP_HYST);
	133	if (rv < 0)
	134	goto abort;
	135	data->temp[2] = rv << 1;
	136	}
b4c9c1a7 GR	137
	138	rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
	139	if (rv < 0)
	140	goto abort;
	141	data->alarms \|= rv;
	142
	143	data->last_updated = jiffies;
	144	data->valid = true;
	145	}
	146	goto done;
	147
	148	abort:
	149	ret = ERR_PTR(rv);
	150	data->valid = false;
	151	done:
	152	mutex_unlock(&data->update_lock);
	153	return ret;
	154	}
	155
0594462f GR	156	static ssize_t adc128_in_show(struct device *dev,
0594462f GR	157	struct device_attribute attr, char buf)
b4c9c1a7 GR	158	{
	159	struct adc128_data *data = adc128_update_device(dev);
	160	int index = to_sensor_dev_attr_2(attr)->index;
	161	int nr = to_sensor_dev_attr_2(attr)->nr;
	162	int val;
	163
	164	if (IS_ERR(data))
	165	return PTR_ERR(data);
	166
	167	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
	168	return sprintf(buf, "%d\n", val);
	169	}
	170
0594462f GR	171	static ssize_t adc128_in_store(struct device *dev,
	172	struct device_attribute attr, const char buf,
	173	size_t count)
b4c9c1a7 GR	174	{
	175	struct adc128_data *data = dev_get_drvdata(dev);
	176	int index = to_sensor_dev_attr_2(attr)->index;
	177	int nr = to_sensor_dev_attr_2(attr)->nr;
	178	u8 reg, regval;
	179	long val;
	180	int err;
	181
	182	err = kstrtol(buf, 10, &val);
	183	if (err < 0)
	184	return err;
	185
	186	mutex_lock(&data->update_lock);
	187	/* 10 mV LSB on limit registers */
	188	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
	189	data->in[index][nr] = regval << 4;
	190	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
	191	i2c_smbus_write_byte_data(data->client, reg, regval);
	192	mutex_unlock(&data->update_lock);
	193
	194	return count;
	195	}
	196
0594462f	197	static ssize_t adc128_temp_show(struct device *dev,
b4c9c1a7 GR	198	struct device_attribute attr, char buf)
	199	{
	200	struct adc128_data *data = adc128_update_device(dev);
	201	int index = to_sensor_dev_attr(attr)->index;
	202	int temp;
	203
	204	if (IS_ERR(data))
	205	return PTR_ERR(data);
	206
2c3b1189	207	temp = sign_extend32(data->temp[index], 8);
b4c9c1a7 GR	208	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
	209	}
	210
0594462f GR	211	static ssize_t adc128_temp_store(struct device *dev,
	212	struct device_attribute *attr,
	213	const char *buf, size_t count)
b4c9c1a7 GR	214	{
	215	struct adc128_data *data = dev_get_drvdata(dev);
	216	int index = to_sensor_dev_attr(attr)->index;
	217	long val;
	218	int err;
	219	s8 regval;
	220
	221	err = kstrtol(buf, 10, &val);
	222	if (err < 0)
	223	return err;
	224
	225	mutex_lock(&data->update_lock);
	226	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	227	data->temp[index] = regval << 1;
	228	i2c_smbus_write_byte_data(data->client,
	229	index == 1 ? ADC128_REG_TEMP_MAX
	230	: ADC128_REG_TEMP_HYST,
	231	regval);
	232	mutex_unlock(&data->update_lock);
	233
	234	return count;
	235	}
	236
0594462f	237	static ssize_t adc128_alarm_show(struct device *dev,
b4c9c1a7 GR	238	struct device_attribute attr, char buf)
	239	{
	240	struct adc128_data *data = adc128_update_device(dev);
	241	int mask = 1 << to_sensor_dev_attr(attr)->index;
	242	u8 alarms;
	243
	244	if (IS_ERR(data))
	245	return PTR_ERR(data);
	246
	247	/*
	248	* Clear an alarm after reporting it to user space. If it is still
	249	* active, the next update sequence will set the alarm bit again.
	250	*/
	251	alarms = data->alarms;
	252	data->alarms &= ~mask;
	253
	254	return sprintf(buf, "%u\n", !!(alarms & mask));
	255	}
	256
4e1796c8 AK	257	static umode_t adc128_is_visible(struct kobject *kobj,
	258	struct attribute *attr, int index)
	259	{
	260	struct device *dev = container_of(kobj, struct device, kobj);
	261	struct adc128_data *data = dev_get_drvdata(dev);
	262
	263	if (index < ADC128_ATTR_NUM_VOLT) {
	264	/* Voltage, visible according to num_inputs[] */
	265	if (index >= num_inputs[data->mode] * 4)
	266	return 0;
	267	} else {
	268	/* Temperature, visible if not in mode 1 */
	269	if (data->mode == 1)
	270	return 0;
	271	}
	272
	273	return attr->mode;
	274	}
	275
0594462f GR	276	static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
	277	static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
	278	static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
	279
	280	static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
	281	static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
	282	static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
	283
	284	static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
	285	static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
	286	static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
	287
	288	static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
	289	static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
	290	static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
	291
	292	static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
	293	static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
	294	static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
	295
	296	static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
	297	static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
	298	static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
	299
	300	static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
	301	static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
	302	static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
	303
	304	static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
	305	static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
	306	static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
	307
	308	static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
	309	static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
	310	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
	311
	312	static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
	313	static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
	314	static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
	315	static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
	316	static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
	317	static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
	318	static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
	319	static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
	320	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
b4c9c1a7 GR	321
b4c9c1a7 GR	322	static struct attribute *adc128_attrs[] = {
4e1796c8	323	&sensor_dev_attr_in0_alarm.dev_attr.attr,
b4c9c1a7	324	&sensor_dev_attr_in0_input.dev_attr.attr,
4e1796c8 AK	325	&sensor_dev_attr_in0_max.dev_attr.attr,
	326	&sensor_dev_attr_in0_min.dev_attr.attr,
	327	&sensor_dev_attr_in1_alarm.dev_attr.attr,
b4c9c1a7	328	&sensor_dev_attr_in1_input.dev_attr.attr,
4e1796c8 AK	329	&sensor_dev_attr_in1_max.dev_attr.attr,
	330	&sensor_dev_attr_in1_min.dev_attr.attr,
	331	&sensor_dev_attr_in2_alarm.dev_attr.attr,
b4c9c1a7	332	&sensor_dev_attr_in2_input.dev_attr.attr,
4e1796c8 AK	333	&sensor_dev_attr_in2_max.dev_attr.attr,
	334	&sensor_dev_attr_in2_min.dev_attr.attr,
	335	&sensor_dev_attr_in3_alarm.dev_attr.attr,
b4c9c1a7	336	&sensor_dev_attr_in3_input.dev_attr.attr,
4e1796c8 AK	337	&sensor_dev_attr_in3_max.dev_attr.attr,
	338	&sensor_dev_attr_in3_min.dev_attr.attr,
	339	&sensor_dev_attr_in4_alarm.dev_attr.attr,
b4c9c1a7	340	&sensor_dev_attr_in4_input.dev_attr.attr,
4e1796c8 AK	341	&sensor_dev_attr_in4_max.dev_attr.attr,
	342	&sensor_dev_attr_in4_min.dev_attr.attr,
	343	&sensor_dev_attr_in5_alarm.dev_attr.attr,
b4c9c1a7	344	&sensor_dev_attr_in5_input.dev_attr.attr,
4e1796c8 AK	345	&sensor_dev_attr_in5_max.dev_attr.attr,
	346	&sensor_dev_attr_in5_min.dev_attr.attr,
	347	&sensor_dev_attr_in6_alarm.dev_attr.attr,
b4c9c1a7	348	&sensor_dev_attr_in6_input.dev_attr.attr,
4e1796c8 AK	349	&sensor_dev_attr_in6_max.dev_attr.attr,
	350	&sensor_dev_attr_in6_min.dev_attr.attr,
	351	&sensor_dev_attr_in7_alarm.dev_attr.attr,
	352	&sensor_dev_attr_in7_input.dev_attr.attr,
	353	&sensor_dev_attr_in7_max.dev_attr.attr,
	354	&sensor_dev_attr_in7_min.dev_attr.attr,
b4c9c1a7 GR	355	&sensor_dev_attr_temp1_input.dev_attr.attr,
b4c9c1a7 GR	356	&sensor_dev_attr_temp1_max.dev_attr.attr,
b4c9c1a7	357	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
4e1796c8	358	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
b4c9c1a7 GR	359	NULL
b4c9c1a7 GR	360	};
4e1796c8	361
33d62d11	362	static const struct attribute_group adc128_group = {
4e1796c8 AK	363	.attrs = adc128_attrs,
	364	.is_visible = adc128_is_visible,
	365	};
	366	__ATTRIBUTE_GROUPS(adc128);
b4c9c1a7 GR	367
	368	static int adc128_detect(struct i2c_client client, struct i2c_board_info info)
	369	{
	370	int man_id, dev_id;
	371
	372	if (!i2c_check_functionality(client->adapter,
	373	I2C_FUNC_SMBUS_BYTE_DATA \|
	374	I2C_FUNC_SMBUS_WORD_DATA))
	375	return -ENODEV;
	376
	377	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
	378	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
	379	if (man_id != 0x01 \|\| dev_id != 0x09)
	380	return -ENODEV;
	381
	382	/* Check unused bits for confirmation */
	383	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
	384	return -ENODEV;
	385	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
	386	return -ENODEV;
	387	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
	388	return -ENODEV;
	389	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
	390	return -ENODEV;
	391	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
	392	return -ENODEV;
	393	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
	394	return -ENODEV;
	395
	396	strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
	397
	398	return 0;
	399	}
	400
	401	static int adc128_init_client(struct adc128_data *data)
	402	{
	403	struct i2c_client *client = data->client;
	404	int err;
	405
	406	/*
	407	* Reset chip to defaults.
	408	* This makes most other initializations unnecessary.
	409	*/
	410	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
	411	if (err)
	412	return err;
	413
a45923c2 AK	414	/* Set operation mode, if non-default */
	415	if (data->mode != 0) {
	416	err = i2c_smbus_write_byte_data(client,
	417	ADC128_REG_CONFIG_ADV,
	418	data->mode << 1);
	419	if (err)
	420	return err;
	421	}
	422
b4c9c1a7 GR	423	/* Start monitoring */
	424	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
	425	if (err)
	426	return err;
	427
	428	/* If external vref is selected, configure the chip to use it */
	429	if (data->regulator) {
	430	err = i2c_smbus_write_byte_data(client,
	431	ADC128_REG_CONFIG_ADV, 0x01);
	432	if (err)
	433	return err;
	434	}
	435
	436	return 0;
	437	}
	438
	439	static int adc128_probe(struct i2c_client *client,
	440	const struct i2c_device_id *id)
	441	{
	442	struct device *dev = &client->dev;
	443	struct regulator *regulator;
	444	struct device *hwmon_dev;
	445	struct adc128_data *data;
	446	int err, vref;
	447
	448	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
	449	if (!data)
	450	return -ENOMEM;
	451
	452	/* vref is optional. If specified, is used as chip reference voltage */
	453	regulator = devm_regulator_get_optional(dev, "vref");
	454	if (!IS_ERR(regulator)) {
	455	data->regulator = regulator;
	456	err = regulator_enable(regulator);
	457	if (err < 0)
	458	return err;
	459	vref = regulator_get_voltage(regulator);
	460	if (vref < 0) {
	461	err = vref;
	462	goto error;
	463	}
	464	data->vref = DIV_ROUND_CLOSEST(vref, 1000);
	465	} else {
	466	data->vref = 2560; /* 2.56V, in mV */
	467	}
	468
c72eeabd	469	/* Operation mode is optional. If unspecified, keep current mode */
a45923c2	470	if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
4e1796c8 AK	471	if (data->mode > 3) {
4e1796c8 AK	472	dev_err(dev, "invalid operation mode %d\n",
a45923c2 AK	473	data->mode);
	474	err = -EINVAL;
	475	goto error;
	476	}
	477	} else {
c72eeabd AK	478	err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
	479	if (err < 0)
	480	goto error;
	481	data->mode = (err >> 1) & ADC128_REG_MASK;
a45923c2 AK	482	}
a45923c2 AK	483
b4c9c1a7 GR	484	data->client = client;
	485	i2c_set_clientdata(client, data);
	486	mutex_init(&data->update_lock);
	487
	488	/* Initialize the chip */
	489	err = adc128_init_client(data);
	490	if (err < 0)
	491	goto error;
	492
	493	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	494	data, adc128_groups);
	495	if (IS_ERR(hwmon_dev)) {
	496	err = PTR_ERR(hwmon_dev);
	497	goto error;
	498	}
	499
	500	return 0;
	501
	502	error:
	503	if (data->regulator)
	504	regulator_disable(data->regulator);
	505	return err;
	506	}
	507
	508	static int adc128_remove(struct i2c_client *client)
	509	{
	510	struct adc128_data *data = i2c_get_clientdata(client);
	511
	512	if (data->regulator)
	513	regulator_disable(data->regulator);
	514
	515	return 0;
	516	}
	517
	518	static const struct i2c_device_id adc128_id[] = {
	519	{ "adc128d818", 0 },
	520	{ }
	521	};
	522	MODULE_DEVICE_TABLE(i2c, adc128_id);
	523
d593e665 JMC	524	static const struct of_device_id adc128_of_match[] = {
	525	{ .compatible = "ti,adc128d818" },
	526	{ },
	527	};
	528	MODULE_DEVICE_TABLE(of, adc128_of_match);
	529
b4c9c1a7 GR	530	static struct i2c_driver adc128_driver = {
	531	.class = I2C_CLASS_HWMON,
	532	.driver = {
	533	.name = "adc128d818",
d593e665	534	.of_match_table = of_match_ptr(adc128_of_match),
b4c9c1a7 GR	535	},
	536	.probe = adc128_probe,
	537	.remove = adc128_remove,
	538	.id_table = adc128_id,
	539	.detect = adc128_detect,
	540	.address_list = normal_i2c,
	541	};
	542
	543	module_i2c_driver(adc128_driver);
	544
	545	MODULE_AUTHOR("Guenter Roeck");
	546	MODULE_DESCRIPTION("Driver for ADC128D818");
	547	MODULE_LICENSE("GPL");