[linux.git] / drivers / hwmon / adc128d818.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for TI ADC128D818 System Monitor with Temperature Sensor
 *
 * Copyright (c) 2014 Guenter Roeck
 *
 * Derived from lm80.c
 * Copyright (C) 1998, 1999  Frodo Looijaard <[email protected]>
 *			     and Philip Edelbrock <[email protected]>
 */

#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 = kobj_to_dev(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;
	u8 regval = 0x0;

	/*
	 * 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)
		regval |= data->mode << 1;

	/* If external vref is selected, configure the chip to use it */
	if (data->regulator)
		regval |= 0x01;

	/* Write advanced configuration register */
	if (regval != 0x0) {
		err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
						regval);
		if (err)
			return err;
	}

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

	return 0;
}

static int adc128_probe(struct i2c_client *client)
{
	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 void adc128_remove(struct i2c_client *client)
{
	struct adc128_data *data = i2c_get_clientdata(client);

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

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

static const struct of_device_id __maybe_unused 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_new	= 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
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
b4c9c1a7 GR	2	/*
	3	* Driver for TI ADC128D818 System Monitor with Temperature Sensor
	4	*
	5	* Copyright (c) 2014 Guenter Roeck
	6	*
	7	* Derived from lm80.c
	8	* Copyright (C) 1998, 1999 Frodo Looijaard <[email protected]>
	9	* and Philip Edelbrock <[email protected]>
b4c9c1a7 GR	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/jiffies.h>
	15	#include <linux/i2c.h>
	16	#include <linux/hwmon.h>
	17	#include <linux/hwmon-sysfs.h>
	18	#include <linux/err.h>
	19	#include <linux/regulator/consumer.h>
	20	#include <linux/mutex.h>
2c3b1189	21	#include <linux/bitops.h>
a45923c2	22	#include <linux/of.h>
b4c9c1a7 GR	23
	24	/* Addresses to scan
	25	* The chip also supports addresses 0x35..0x37. Don't scan those addresses
	26	* since they are also used by some EEPROMs, which may result in false
	27	* positives.
	28	*/
	29	static const unsigned short normal_i2c[] = {
	30	0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
	31
	32	/* registers */
	33	#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
	34	#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
	35	#define ADC128_REG_IN(nr) (0x20 + (nr))
	36
	37	#define ADC128_REG_TEMP 0x27
	38	#define ADC128_REG_TEMP_MAX 0x38
	39	#define ADC128_REG_TEMP_HYST 0x39
	40
	41	#define ADC128_REG_CONFIG 0x00
	42	#define ADC128_REG_ALARM 0x01
	43	#define ADC128_REG_MASK 0x03
	44	#define ADC128_REG_CONV_RATE 0x07
	45	#define ADC128_REG_ONESHOT 0x09
	46	#define ADC128_REG_SHUTDOWN 0x0a
	47	#define ADC128_REG_CONFIG_ADV 0x0b
	48	#define ADC128_REG_BUSY_STATUS 0x0c
	49
	50	#define ADC128_REG_MAN_ID 0x3e
	51	#define ADC128_REG_DEV_ID 0x3f
	52
4e1796c8 AK	53	/* No. of voltage entries in adc128_attrs */
	54	#define ADC128_ATTR_NUM_VOLT (8 * 4)
	55
	56	/* Voltage inputs visible per operation mode */
	57	static const u8 num_inputs[] = { 7, 8, 4, 6 };
	58
b4c9c1a7 GR	59	struct adc128_data {
	60	struct i2c_client *client;
	61	struct regulator *regulator;
	62	int vref; /* Reference voltage in mV */
	63	struct mutex update_lock;
a45923c2	64	u8 mode; /* Operation mode */
b4c9c1a7 GR	65	bool valid; /* true if following fields are valid */
	66	unsigned long last_updated; /* In jiffies */
	67
4e1796c8	68	u16 in[3][8]; /* Register value, normalized to 12 bit
b4c9c1a7 GR	69	* 0: input voltage
	70	* 1: min limit
	71	* 2: max limit
	72	*/
	73	s16 temp[3]; /* Register value, normalized to 9 bit
	74	* 0: sensor 1: limit 2: hyst
	75	*/
	76	u8 alarms; /* alarm register value */
	77	};
	78
	79	static struct adc128_data adc128_update_device(struct device dev)
	80	{
	81	struct adc128_data *data = dev_get_drvdata(dev);
	82	struct i2c_client *client = data->client;
	83	struct adc128_data *ret = data;
	84	int i, rv;
	85
	86	mutex_lock(&data->update_lock);
	87
	88	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
4e1796c8	89	for (i = 0; i < num_inputs[data->mode]; i++) {
b4c9c1a7 GR	90	rv = i2c_smbus_read_word_swapped(client,
	91	ADC128_REG_IN(i));
	92	if (rv < 0)
	93	goto abort;
	94	data->in[0][i] = rv >> 4;
	95
	96	rv = i2c_smbus_read_byte_data(client,
	97	ADC128_REG_IN_MIN(i));
	98	if (rv < 0)
	99	goto abort;
	100	data->in[1][i] = rv << 4;
	101
	102	rv = i2c_smbus_read_byte_data(client,
	103	ADC128_REG_IN_MAX(i));
	104	if (rv < 0)
	105	goto abort;
	106	data->in[2][i] = rv << 4;
	107	}
	108
4e1796c8 AK	109	if (data->mode != 1) {
	110	rv = i2c_smbus_read_word_swapped(client,
	111	ADC128_REG_TEMP);
	112	if (rv < 0)
	113	goto abort;
	114	data->temp[0] = rv >> 7;
b4c9c1a7	115
4e1796c8 AK	116	rv = i2c_smbus_read_byte_data(client,
	117	ADC128_REG_TEMP_MAX);
	118	if (rv < 0)
	119	goto abort;
	120	data->temp[1] = rv << 1;
b4c9c1a7	121
4e1796c8 AK	122	rv = i2c_smbus_read_byte_data(client,
	123	ADC128_REG_TEMP_HYST);
	124	if (rv < 0)
	125	goto abort;
	126	data->temp[2] = rv << 1;
	127	}
b4c9c1a7 GR	128
	129	rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
	130	if (rv < 0)
	131	goto abort;
	132	data->alarms \|= rv;
	133
	134	data->last_updated = jiffies;
	135	data->valid = true;
	136	}
	137	goto done;
	138
	139	abort:
	140	ret = ERR_PTR(rv);
	141	data->valid = false;
	142	done:
	143	mutex_unlock(&data->update_lock);
	144	return ret;
	145	}
	146
0594462f GR	147	static ssize_t adc128_in_show(struct device *dev,
0594462f GR	148	struct device_attribute attr, char buf)
b4c9c1a7 GR	149	{
	150	struct adc128_data *data = adc128_update_device(dev);
	151	int index = to_sensor_dev_attr_2(attr)->index;
	152	int nr = to_sensor_dev_attr_2(attr)->nr;
	153	int val;
	154
	155	if (IS_ERR(data))
	156	return PTR_ERR(data);
	157
	158	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
	159	return sprintf(buf, "%d\n", val);
	160	}
	161
0594462f GR	162	static ssize_t adc128_in_store(struct device *dev,
	163	struct device_attribute attr, const char buf,
	164	size_t count)
b4c9c1a7 GR	165	{
	166	struct adc128_data *data = dev_get_drvdata(dev);
	167	int index = to_sensor_dev_attr_2(attr)->index;
	168	int nr = to_sensor_dev_attr_2(attr)->nr;
	169	u8 reg, regval;
	170	long val;
	171	int err;
	172
	173	err = kstrtol(buf, 10, &val);
	174	if (err < 0)
	175	return err;
	176
	177	mutex_lock(&data->update_lock);
	178	/* 10 mV LSB on limit registers */
	179	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
	180	data->in[index][nr] = regval << 4;
	181	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
	182	i2c_smbus_write_byte_data(data->client, reg, regval);
	183	mutex_unlock(&data->update_lock);
	184
	185	return count;
	186	}
	187
0594462f	188	static ssize_t adc128_temp_show(struct device *dev,
b4c9c1a7 GR	189	struct device_attribute attr, char buf)
	190	{
	191	struct adc128_data *data = adc128_update_device(dev);
	192	int index = to_sensor_dev_attr(attr)->index;
	193	int temp;
	194
	195	if (IS_ERR(data))
	196	return PTR_ERR(data);
	197
2c3b1189	198	temp = sign_extend32(data->temp[index], 8);
b4c9c1a7 GR	199	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
	200	}
	201
0594462f GR	202	static ssize_t adc128_temp_store(struct device *dev,
	203	struct device_attribute *attr,
	204	const char *buf, size_t count)
b4c9c1a7 GR	205	{
	206	struct adc128_data *data = dev_get_drvdata(dev);
	207	int index = to_sensor_dev_attr(attr)->index;
	208	long val;
	209	int err;
	210	s8 regval;
	211
	212	err = kstrtol(buf, 10, &val);
	213	if (err < 0)
	214	return err;
	215
	216	mutex_lock(&data->update_lock);
	217	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	218	data->temp[index] = regval << 1;
	219	i2c_smbus_write_byte_data(data->client,
	220	index == 1 ? ADC128_REG_TEMP_MAX
	221	: ADC128_REG_TEMP_HYST,
	222	regval);
	223	mutex_unlock(&data->update_lock);
	224
	225	return count;
	226	}
	227
0594462f	228	static ssize_t adc128_alarm_show(struct device *dev,
b4c9c1a7 GR	229	struct device_attribute attr, char buf)
	230	{
	231	struct adc128_data *data = adc128_update_device(dev);
	232	int mask = 1 << to_sensor_dev_attr(attr)->index;
	233	u8 alarms;
	234
	235	if (IS_ERR(data))
	236	return PTR_ERR(data);
	237
	238	/*
	239	* Clear an alarm after reporting it to user space. If it is still
	240	* active, the next update sequence will set the alarm bit again.
	241	*/
	242	alarms = data->alarms;
	243	data->alarms &= ~mask;
	244
	245	return sprintf(buf, "%u\n", !!(alarms & mask));
	246	}
	247
4e1796c8 AK	248	static umode_t adc128_is_visible(struct kobject *kobj,
	249	struct attribute *attr, int index)
	250	{
9d2227bb	251	struct device *dev = kobj_to_dev(kobj);
4e1796c8 AK	252	struct adc128_data *data = dev_get_drvdata(dev);
	253
	254	if (index < ADC128_ATTR_NUM_VOLT) {
	255	/* Voltage, visible according to num_inputs[] */
	256	if (index >= num_inputs[data->mode] * 4)
	257	return 0;
	258	} else {
	259	/* Temperature, visible if not in mode 1 */
	260	if (data->mode == 1)
	261	return 0;
	262	}
	263
	264	return attr->mode;
	265	}
	266
0594462f GR	267	static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
	268	static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
	269	static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
	270
	271	static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
	272	static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
	273	static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
	274
	275	static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
	276	static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
	277	static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
	278
	279	static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
	280	static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
	281	static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
	282
	283	static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
	284	static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
	285	static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
	286
	287	static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
	288	static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
	289	static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
	290
	291	static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
	292	static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
	293	static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
	294
	295	static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
	296	static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
	297	static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
	298
	299	static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
	300	static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
	301	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
	302
	303	static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
	304	static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
	305	static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
	306	static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
	307	static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
	308	static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
	309	static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
	310	static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
	311	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
b4c9c1a7 GR	312
b4c9c1a7 GR	313	static struct attribute *adc128_attrs[] = {
4e1796c8	314	&sensor_dev_attr_in0_alarm.dev_attr.attr,
b4c9c1a7	315	&sensor_dev_attr_in0_input.dev_attr.attr,
4e1796c8 AK	316	&sensor_dev_attr_in0_max.dev_attr.attr,
	317	&sensor_dev_attr_in0_min.dev_attr.attr,
	318	&sensor_dev_attr_in1_alarm.dev_attr.attr,
b4c9c1a7	319	&sensor_dev_attr_in1_input.dev_attr.attr,
4e1796c8 AK	320	&sensor_dev_attr_in1_max.dev_attr.attr,
	321	&sensor_dev_attr_in1_min.dev_attr.attr,
	322	&sensor_dev_attr_in2_alarm.dev_attr.attr,
b4c9c1a7	323	&sensor_dev_attr_in2_input.dev_attr.attr,
4e1796c8 AK	324	&sensor_dev_attr_in2_max.dev_attr.attr,
	325	&sensor_dev_attr_in2_min.dev_attr.attr,
	326	&sensor_dev_attr_in3_alarm.dev_attr.attr,
b4c9c1a7	327	&sensor_dev_attr_in3_input.dev_attr.attr,
4e1796c8 AK	328	&sensor_dev_attr_in3_max.dev_attr.attr,
	329	&sensor_dev_attr_in3_min.dev_attr.attr,
	330	&sensor_dev_attr_in4_alarm.dev_attr.attr,
b4c9c1a7	331	&sensor_dev_attr_in4_input.dev_attr.attr,
4e1796c8 AK	332	&sensor_dev_attr_in4_max.dev_attr.attr,
	333	&sensor_dev_attr_in4_min.dev_attr.attr,
	334	&sensor_dev_attr_in5_alarm.dev_attr.attr,
b4c9c1a7	335	&sensor_dev_attr_in5_input.dev_attr.attr,
4e1796c8 AK	336	&sensor_dev_attr_in5_max.dev_attr.attr,
	337	&sensor_dev_attr_in5_min.dev_attr.attr,
	338	&sensor_dev_attr_in6_alarm.dev_attr.attr,
b4c9c1a7	339	&sensor_dev_attr_in6_input.dev_attr.attr,
4e1796c8 AK	340	&sensor_dev_attr_in6_max.dev_attr.attr,
	341	&sensor_dev_attr_in6_min.dev_attr.attr,
	342	&sensor_dev_attr_in7_alarm.dev_attr.attr,
	343	&sensor_dev_attr_in7_input.dev_attr.attr,
	344	&sensor_dev_attr_in7_max.dev_attr.attr,
	345	&sensor_dev_attr_in7_min.dev_attr.attr,
b4c9c1a7 GR	346	&sensor_dev_attr_temp1_input.dev_attr.attr,
b4c9c1a7 GR	347	&sensor_dev_attr_temp1_max.dev_attr.attr,
b4c9c1a7	348	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
4e1796c8	349	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
b4c9c1a7 GR	350	NULL
b4c9c1a7 GR	351	};
4e1796c8	352
33d62d11	353	static const struct attribute_group adc128_group = {
4e1796c8 AK	354	.attrs = adc128_attrs,
	355	.is_visible = adc128_is_visible,
	356	};
	357	__ATTRIBUTE_GROUPS(adc128);
b4c9c1a7 GR	358
	359	static int adc128_detect(struct i2c_client client, struct i2c_board_info info)
	360	{
	361	int man_id, dev_id;
	362
	363	if (!i2c_check_functionality(client->adapter,
	364	I2C_FUNC_SMBUS_BYTE_DATA \|
	365	I2C_FUNC_SMBUS_WORD_DATA))
	366	return -ENODEV;
	367
	368	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
	369	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
	370	if (man_id != 0x01 \|\| dev_id != 0x09)
	371	return -ENODEV;
	372
	373	/* Check unused bits for confirmation */
	374	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
	375	return -ENODEV;
	376	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
	377	return -ENODEV;
	378	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
	379	return -ENODEV;
	380	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
	381	return -ENODEV;
	382	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
	383	return -ENODEV;
	384	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
	385	return -ENODEV;
	386
	387	strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
	388
	389	return 0;
	390	}
	391
	392	static int adc128_init_client(struct adc128_data *data)
	393	{
	394	struct i2c_client *client = data->client;
	395	int err;
e2f75e6b	396	u8 regval = 0x0;
b4c9c1a7 GR	397
	398	/*
	399	* Reset chip to defaults.
	400	* This makes most other initializations unnecessary.
	401	*/
	402	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
	403	if (err)
	404	return err;
	405
a45923c2	406	/* Set operation mode, if non-default */
e2f75e6b RD	407	if (data->mode != 0)
	408	regval \|= data->mode << 1;
	409
	410	/* If external vref is selected, configure the chip to use it */
	411	if (data->regulator)
	412	regval \|= 0x01;
	413
	414	/* Write advanced configuration register */
	415	if (regval != 0x0) {
	416	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
	417	regval);
a45923c2 AK	418	if (err)
	419	return err;
	420	}
	421
b4c9c1a7 GR	422	/* Start monitoring */
	423	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
	424	if (err)
	425	return err;
	426
b4c9c1a7 GR	427	return 0;
	428	}
	429
673afe46	430	static int adc128_probe(struct i2c_client *client)
b4c9c1a7 GR	431	{
	432	struct device *dev = &client->dev;
	433	struct regulator *regulator;
	434	struct device *hwmon_dev;
	435	struct adc128_data *data;
	436	int err, vref;
	437
	438	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
	439	if (!data)
	440	return -ENOMEM;
	441
	442	/* vref is optional. If specified, is used as chip reference voltage */
	443	regulator = devm_regulator_get_optional(dev, "vref");
	444	if (!IS_ERR(regulator)) {
	445	data->regulator = regulator;
	446	err = regulator_enable(regulator);
	447	if (err < 0)
	448	return err;
	449	vref = regulator_get_voltage(regulator);
	450	if (vref < 0) {
	451	err = vref;
	452	goto error;
	453	}
	454	data->vref = DIV_ROUND_CLOSEST(vref, 1000);
	455	} else {
	456	data->vref = 2560; /* 2.56V, in mV */
	457	}
	458
c72eeabd	459	/* Operation mode is optional. If unspecified, keep current mode */
a45923c2	460	if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
4e1796c8 AK	461	if (data->mode > 3) {
4e1796c8 AK	462	dev_err(dev, "invalid operation mode %d\n",
a45923c2 AK	463	data->mode);
	464	err = -EINVAL;
	465	goto error;
	466	}
	467	} else {
c72eeabd AK	468	err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
	469	if (err < 0)
	470	goto error;
	471	data->mode = (err >> 1) & ADC128_REG_MASK;
a45923c2 AK	472	}
a45923c2 AK	473
b4c9c1a7 GR	474	data->client = client;
	475	i2c_set_clientdata(client, data);
	476	mutex_init(&data->update_lock);
	477
	478	/* Initialize the chip */
	479	err = adc128_init_client(data);
	480	if (err < 0)
	481	goto error;
	482
	483	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	484	data, adc128_groups);
	485	if (IS_ERR(hwmon_dev)) {
	486	err = PTR_ERR(hwmon_dev);
	487	goto error;
	488	}
	489
	490	return 0;
	491
	492	error:
	493	if (data->regulator)
	494	regulator_disable(data->regulator);
	495	return err;
	496	}
	497
ed5c2f5f	498	static void adc128_remove(struct i2c_client *client)
b4c9c1a7 GR	499	{
	500	struct adc128_data *data = i2c_get_clientdata(client);
	501
	502	if (data->regulator)
	503	regulator_disable(data->regulator);
b4c9c1a7 GR	504	}
	505
	506	static const struct i2c_device_id adc128_id[] = {
	507	{ "adc128d818", 0 },
	508	{ }
	509	};
	510	MODULE_DEVICE_TABLE(i2c, adc128_id);
	511
462d7e7e	512	static const struct of_device_id __maybe_unused adc128_of_match[] = {
d593e665 JMC	513	{ .compatible = "ti,adc128d818" },
	514	{ },
	515	};
	516	MODULE_DEVICE_TABLE(of, adc128_of_match);
	517
b4c9c1a7 GR	518	static struct i2c_driver adc128_driver = {
	519	.class = I2C_CLASS_HWMON,
	520	.driver = {
	521	.name = "adc128d818",
d593e665	522	.of_match_table = of_match_ptr(adc128_of_match),
b4c9c1a7	523	},
673afe46	524	.probe_new = adc128_probe,
b4c9c1a7 GR	525	.remove = adc128_remove,
	526	.id_table = adc128_id,
	527	.detect = adc128_detect,
	528	.address_list = normal_i2c,
	529	};
	530
	531	module_i2c_driver(adc128_driver);
	532
	533	MODULE_AUTHOR("Guenter Roeck");
	534	MODULE_DESCRIPTION("Driver for ADC128D818");
	535	MODULE_LICENSE("GPL");