[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>

/* 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

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

	u16 in[3][7];		/* 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 < 7; 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;
		}

		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_show_in(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_set_in(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_show_temp(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_set_temp(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_show_alarm(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 SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
			    adc128_show_in, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 0, 1);
static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 0, 2);

static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
			    adc128_show_in, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 1, 1);
static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 1, 2);

static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
			    adc128_show_in, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 2, 1);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 2, 2);

static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
			    adc128_show_in, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 3, 1);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 3, 2);

static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
			    adc128_show_in, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 4, 1);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 4, 2);

static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
			    adc128_show_in, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 5, 1);
static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 5, 2);

static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
			    adc128_show_in, NULL, 6, 0);
static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 6, 1);
static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 6, 2);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
			  adc128_show_temp, adc128_set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
			  adc128_show_temp, adc128_set_temp, 2);

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);

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

	/* 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 */
	}

	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 struct i2c_driver adc128_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "adc128d818",
	},
	.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>
b4c9c1a7 GR	31
	32	/* Addresses to scan
	33	* The chip also supports addresses 0x35..0x37. Don't scan those addresses
	34	* since they are also used by some EEPROMs, which may result in false
	35	* positives.
	36	*/
	37	static const unsigned short normal_i2c[] = {
	38	0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
	39
	40	/* registers */
	41	#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
	42	#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
	43	#define ADC128_REG_IN(nr) (0x20 + (nr))
	44
	45	#define ADC128_REG_TEMP 0x27
	46	#define ADC128_REG_TEMP_MAX 0x38
	47	#define ADC128_REG_TEMP_HYST 0x39
	48
	49	#define ADC128_REG_CONFIG 0x00
	50	#define ADC128_REG_ALARM 0x01
	51	#define ADC128_REG_MASK 0x03
	52	#define ADC128_REG_CONV_RATE 0x07
	53	#define ADC128_REG_ONESHOT 0x09
	54	#define ADC128_REG_SHUTDOWN 0x0a
	55	#define ADC128_REG_CONFIG_ADV 0x0b
	56	#define ADC128_REG_BUSY_STATUS 0x0c
	57
	58	#define ADC128_REG_MAN_ID 0x3e
	59	#define ADC128_REG_DEV_ID 0x3f
	60
	61	struct adc128_data {
	62	struct i2c_client *client;
	63	struct regulator *regulator;
	64	int vref; /* Reference voltage in mV */
	65	struct mutex update_lock;
	66	bool valid; /* true if following fields are valid */
	67	unsigned long last_updated; /* In jiffies */
	68
	69	u16 in[3][7]; /* Register value, normalized to 12 bit
	70	* 0: input voltage
	71	* 1: min limit
	72	* 2: max limit
	73	*/
	74	s16 temp[3]; /* Register value, normalized to 9 bit
	75	* 0: sensor 1: limit 2: hyst
	76	*/
	77	u8 alarms; /* alarm register value */
	78	};
	79
	80	static struct adc128_data adc128_update_device(struct device dev)
	81	{
	82	struct adc128_data *data = dev_get_drvdata(dev);
	83	struct i2c_client *client = data->client;
	84	struct adc128_data *ret = data;
	85	int i, rv;
	86
	87	mutex_lock(&data->update_lock);
	88
	89	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
	90	for (i = 0; i < 7; i++) {
	91	rv = i2c_smbus_read_word_swapped(client,
	92	ADC128_REG_IN(i));
	93	if (rv < 0)
	94	goto abort;
95	data->in[0][i] = rv >> 4;
96
97	rv = i2c_smbus_read_byte_data(client,
98	ADC128_REG_IN_MIN(i));
99	if (rv < 0)
100	goto abort;
101	data->in[1][i] = rv << 4;
102
103	rv = i2c_smbus_read_byte_data(client,
104	ADC128_REG_IN_MAX(i));
105	if (rv < 0)
106	goto abort;
107	data->in[2][i] = rv << 4;
108	}
109
110	rv = i2c_smbus_read_word_swapped(client, ADC128_REG_TEMP);
111	if (rv < 0)
112	goto abort;
113	data->temp[0] = rv >> 7;
114
115	rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_MAX);
116	if (rv < 0)
117	goto abort;
118	data->temp[1] = rv << 1;
119
120	rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_HYST);
121	if (rv < 0)
122	goto abort;
123	data->temp[2] = rv << 1;
124
125	rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
126	if (rv < 0)
127	goto abort;
128	data->alarms \|= rv;
129
130	data->last_updated = jiffies;
131	data->valid = true;
132	}
133	goto done;
134
135	abort:
136	ret = ERR_PTR(rv);
137	data->valid = false;
138	done:
139	mutex_unlock(&data->update_lock);
140	return ret;
141	}
142
143	static ssize_t adc128_show_in(struct device dev, struct device_attribute attr,
144	char *buf)
145	{
146	struct adc128_data *data = adc128_update_device(dev);
147	int index = to_sensor_dev_attr_2(attr)->index;
148	int nr = to_sensor_dev_attr_2(attr)->nr;
149	int val;
150
151	if (IS_ERR(data))
152	return PTR_ERR(data);
153
154	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
155	return sprintf(buf, "%d\n", val);
156	}
157
158	static ssize_t adc128_set_in(struct device dev, struct device_attribute attr,
159	const char *buf, size_t count)
160	{
161	struct adc128_data *data = dev_get_drvdata(dev);
162	int index = to_sensor_dev_attr_2(attr)->index;
163	int nr = to_sensor_dev_attr_2(attr)->nr;
164	u8 reg, regval;
165	long val;
166	int err;
167
168	err = kstrtol(buf, 10, &val);
169	if (err < 0)
170	return err;
171
172	mutex_lock(&data->update_lock);
173	/* 10 mV LSB on limit registers */
174	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
175	data->in[index][nr] = regval << 4;
176	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
177	i2c_smbus_write_byte_data(data->client, reg, regval);
178	mutex_unlock(&data->update_lock);
179
180	return count;
181	}
182
183	static ssize_t adc128_show_temp(struct device *dev,
184	struct device_attribute attr, char buf)
185	{
186	struct adc128_data *data = adc128_update_device(dev);
187	int index = to_sensor_dev_attr(attr)->index;
188	int temp;
189
190	if (IS_ERR(data))
191	return PTR_ERR(data);
192
2c3b1189	193	temp = sign_extend32(data->temp[index], 8);
b4c9c1a7 GR	194	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
	195	}
	196
	197	static ssize_t adc128_set_temp(struct device *dev,
	198	struct device_attribute *attr,
	199	const char *buf, size_t count)
	200	{
	201	struct adc128_data *data = dev_get_drvdata(dev);
	202	int index = to_sensor_dev_attr(attr)->index;
	203	long val;
	204	int err;
	205	s8 regval;
	206
	207	err = kstrtol(buf, 10, &val);
	208	if (err < 0)
	209	return err;
	210
	211	mutex_lock(&data->update_lock);
	212	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	213	data->temp[index] = regval << 1;
	214	i2c_smbus_write_byte_data(data->client,
	215	index == 1 ? ADC128_REG_TEMP_MAX
	216	: ADC128_REG_TEMP_HYST,
	217	regval);
	218	mutex_unlock(&data->update_lock);
	219
	220	return count;
	221	}
	222
	223	static ssize_t adc128_show_alarm(struct device *dev,
	224	struct device_attribute attr, char buf)
	225	{
	226	struct adc128_data *data = adc128_update_device(dev);
	227	int mask = 1 << to_sensor_dev_attr(attr)->index;
	228	u8 alarms;
	229
	230	if (IS_ERR(data))
	231	return PTR_ERR(data);
	232
	233	/*
	234	* Clear an alarm after reporting it to user space. If it is still
	235	* active, the next update sequence will set the alarm bit again.
	236	*/
	237	alarms = data->alarms;
	238	data->alarms &= ~mask;
	239
	240	return sprintf(buf, "%u\n", !!(alarms & mask));
	241	}
	242
7fe7381c GR	243	static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
7fe7381c GR	244	adc128_show_in, NULL, 0, 0);
b4c9c1a7 GR	245	static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR \| S_IRUGO,
	246	adc128_show_in, adc128_set_in, 0, 1);
	247	static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR \| S_IRUGO,
	248	adc128_show_in, adc128_set_in, 0, 2);
	249
7fe7381c GR	250	static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
7fe7381c GR	251	adc128_show_in, NULL, 1, 0);
b4c9c1a7 GR	252	static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR \| S_IRUGO,
	253	adc128_show_in, adc128_set_in, 1, 1);
	254	static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR \| S_IRUGO,
	255	adc128_show_in, adc128_set_in, 1, 2);
	256
7fe7381c GR	257	static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
7fe7381c GR	258	adc128_show_in, NULL, 2, 0);
b4c9c1a7 GR	259	static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR \| S_IRUGO,
	260	adc128_show_in, adc128_set_in, 2, 1);
	261	static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR \| S_IRUGO,
	262	adc128_show_in, adc128_set_in, 2, 2);
	263
7fe7381c GR	264	static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
7fe7381c GR	265	adc128_show_in, NULL, 3, 0);
b4c9c1a7 GR	266	static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR \| S_IRUGO,
	267	adc128_show_in, adc128_set_in, 3, 1);
	268	static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR \| S_IRUGO,
	269	adc128_show_in, adc128_set_in, 3, 2);
	270
7fe7381c GR	271	static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
7fe7381c GR	272	adc128_show_in, NULL, 4, 0);
b4c9c1a7 GR	273	static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR \| S_IRUGO,
	274	adc128_show_in, adc128_set_in, 4, 1);
	275	static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR \| S_IRUGO,
	276	adc128_show_in, adc128_set_in, 4, 2);
	277
7fe7381c GR	278	static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
7fe7381c GR	279	adc128_show_in, NULL, 5, 0);
b4c9c1a7 GR	280	static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR \| S_IRUGO,
	281	adc128_show_in, adc128_set_in, 5, 1);
	282	static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR \| S_IRUGO,
	283	adc128_show_in, adc128_set_in, 5, 2);
	284
7fe7381c GR	285	static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
7fe7381c GR	286	adc128_show_in, NULL, 6, 0);
b4c9c1a7 GR	287	static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR \| S_IRUGO,
	288	adc128_show_in, adc128_set_in, 6, 1);
	289	static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR \| S_IRUGO,
	290	adc128_show_in, adc128_set_in, 6, 2);
	291
	292	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
	293	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	294	adc128_show_temp, adc128_set_temp, 1);
	295	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	296	adc128_show_temp, adc128_set_temp, 2);
	297
	298	static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
	299	static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
	300	static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
	301	static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
	302	static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
	303	static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
	304	static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
	305	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
	306
	307	static struct attribute *adc128_attrs[] = {
	308	&sensor_dev_attr_in0_min.dev_attr.attr,
	309	&sensor_dev_attr_in1_min.dev_attr.attr,
	310	&sensor_dev_attr_in2_min.dev_attr.attr,
	311	&sensor_dev_attr_in3_min.dev_attr.attr,
	312	&sensor_dev_attr_in4_min.dev_attr.attr,
	313	&sensor_dev_attr_in5_min.dev_attr.attr,
	314	&sensor_dev_attr_in6_min.dev_attr.attr,
	315	&sensor_dev_attr_in0_max.dev_attr.attr,
	316	&sensor_dev_attr_in1_max.dev_attr.attr,
	317	&sensor_dev_attr_in2_max.dev_attr.attr,
	318	&sensor_dev_attr_in3_max.dev_attr.attr,
	319	&sensor_dev_attr_in4_max.dev_attr.attr,
	320	&sensor_dev_attr_in5_max.dev_attr.attr,
	321	&sensor_dev_attr_in6_max.dev_attr.attr,
	322	&sensor_dev_attr_in0_input.dev_attr.attr,
	323	&sensor_dev_attr_in1_input.dev_attr.attr,
	324	&sensor_dev_attr_in2_input.dev_attr.attr,
	325	&sensor_dev_attr_in3_input.dev_attr.attr,
	326	&sensor_dev_attr_in4_input.dev_attr.attr,
	327	&sensor_dev_attr_in5_input.dev_attr.attr,
	328	&sensor_dev_attr_in6_input.dev_attr.attr,
	329	&sensor_dev_attr_temp1_input.dev_attr.attr,
	330	&sensor_dev_attr_temp1_max.dev_attr.attr,
	331	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	332	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	333	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	334	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	335	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	336	&sensor_dev_attr_in4_alarm.dev_attr.attr,
	337	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	338	&sensor_dev_attr_in6_alarm.dev_attr.attr,
	339	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	340	NULL
	341	};
	342	ATTRIBUTE_GROUPS(adc128);
	343
	344	static int adc128_detect(struct i2c_client client, struct i2c_board_info info)
	345	{
	346	int man_id, dev_id;
	347
	348	if (!i2c_check_functionality(client->adapter,
	349	I2C_FUNC_SMBUS_BYTE_DATA \|
	350	I2C_FUNC_SMBUS_WORD_DATA))
351	return -ENODEV;
352
353	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
354	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
355	if (man_id != 0x01 \|\| dev_id != 0x09)
356	return -ENODEV;
357
358	/* Check unused bits for confirmation */
359	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
360	return -ENODEV;
361	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
362	return -ENODEV;
363	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
364	return -ENODEV;
365	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
366	return -ENODEV;
367	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
368	return -ENODEV;
369	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
370	return -ENODEV;
371
372	strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
373
374	return 0;
375	}
376
377	static int adc128_init_client(struct adc128_data *data)
378	{
379	struct i2c_client *client = data->client;
380	int err;
381
382	/*
383	* Reset chip to defaults.
384	* This makes most other initializations unnecessary.
385	*/
386	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
387	if (err)
388	return err;
389
390	/* Start monitoring */
391	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
392	if (err)
393	return err;
394
395	/* If external vref is selected, configure the chip to use it */
396	if (data->regulator) {
397	err = i2c_smbus_write_byte_data(client,
398	ADC128_REG_CONFIG_ADV, 0x01);
399	if (err)
400	return err;
401	}
402
403	return 0;
404	}
405
406	static int adc128_probe(struct i2c_client *client,
407	const struct i2c_device_id *id)
408	{
409	struct device *dev = &client->dev;
410	struct regulator *regulator;
411	struct device *hwmon_dev;
412	struct adc128_data *data;
413	int err, vref;
414
415	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
416	if (!data)
417	return -ENOMEM;
418
419	/* vref is optional. If specified, is used as chip reference voltage */
420	regulator = devm_regulator_get_optional(dev, "vref");
421	if (!IS_ERR(regulator)) {
422	data->regulator = regulator;
423	err = regulator_enable(regulator);
424	if (err < 0)
425	return err;
426	vref = regulator_get_voltage(regulator);
427	if (vref < 0) {
428	err = vref;
429	goto error;
430	}
431	data->vref = DIV_ROUND_CLOSEST(vref, 1000);
432	} else {
433	data->vref = 2560; /* 2.56V, in mV */
434	}
435
436	data->client = client;
437	i2c_set_clientdata(client, data);
438	mutex_init(&data->update_lock);
439
440	/* Initialize the chip */
441	err = adc128_init_client(data);
442	if (err < 0)
443	goto error;
444
445	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
446	data, adc128_groups);
447	if (IS_ERR(hwmon_dev)) {
448	err = PTR_ERR(hwmon_dev);
449	goto error;
450	}
451
452	return 0;
453
454	error:
455	if (data->regulator)
456	regulator_disable(data->regulator);
457	return err;
458	}
459
460	static int adc128_remove(struct i2c_client *client)
461	{
462	struct adc128_data *data = i2c_get_clientdata(client);
463
464	if (data->regulator)
465	regulator_disable(data->regulator);
466
467	return 0;
468	}
469
470	static const struct i2c_device_id adc128_id[] = {
471	{ "adc128d818", 0 },
472	{ }
473	};
474	MODULE_DEVICE_TABLE(i2c, adc128_id);
475
476	static struct i2c_driver adc128_driver = {
477	.class = I2C_CLASS_HWMON,
478	.driver = {
479	.name = "adc128d818",
480	},
481	.probe = adc128_probe,
482	.remove = adc128_remove,
483	.id_table = adc128_id,
484	.detect = adc128_detect,
485	.address_list = normal_i2c,
486	};
487
488	module_i2c_driver(adc128_driver);
489
490	MODULE_AUTHOR("Guenter Roeck");
491	MODULE_DESCRIPTION("Driver for ADC128D818");
492	MODULE_LICENSE("GPL");