[linux-2.6-block.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 <frodol@dds.nl>
 *			     and Philip Edelbrock <phil@netroedge.com>
 */

#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;
	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;

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

	return 0;
}

static int adc128_init_client(struct adc128_data *data, bool external_vref)
{
	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 (external_vref)
		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 device *hwmon_dev;
	struct adc128_data *data;
	bool external_vref;
	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 */
	vref = devm_regulator_get_enable_read_voltage(dev, "vref");
	if (vref == -ENODEV) {
		external_vref = false;
		data->vref = 2560;	/* 2.56V, in mV */
	} else if (vref < 0) {
		return vref;
	} else {
		external_vref = true;
		data->vref = DIV_ROUND_CLOSEST(vref, 1000);
	}

	/* 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);
			return -EINVAL;
		}
	} else {
		err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
		if (err < 0)
			return err;
		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, external_vref);
	if (err < 0)
		return err;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data, adc128_groups);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	return 0;
}

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		= adc128_probe,
	.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 <frodol@dds.nl>
	9	* and Philip Edelbrock <phil@netroedge.com>
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 {
b4c9c1a7 GR	60	struct i2c_client *client;
b4c9c1a7 GR	61	int vref; /* Reference voltage in mV */
b4c9c1a7 GR	62	struct mutex update_lock;
a45923c2	63	u8 mode; /* Operation mode */
b4c9c1a7 GR	64	bool valid; /* true if following fields are valid */
	65	unsigned long last_updated; /* In jiffies */
	66
4e1796c8	67	u16 in[3][8]; /* Register value, normalized to 12 bit
b4c9c1a7 GR	68	* 0: input voltage
	69	* 1: min limit
	70	* 2: max limit
	71	*/
	72	s16 temp[3]; /* Register value, normalized to 9 bit
	73	* 0: sensor 1: limit 2: hyst
	74	*/
	75	u8 alarms; /* alarm register value */
	76	};
	77
	78	static struct adc128_data adc128_update_device(struct device dev)
	79	{
	80	struct adc128_data *data = dev_get_drvdata(dev);
	81	struct i2c_client *client = data->client;
	82	struct adc128_data *ret = data;
	83	int i, rv;
	84
	85	mutex_lock(&data->update_lock);
	86
	87	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
4e1796c8	88	for (i = 0; i < num_inputs[data->mode]; i++) {
b4c9c1a7 GR	89	rv = i2c_smbus_read_word_swapped(client,
	90	ADC128_REG_IN(i));
	91	if (rv < 0)
	92	goto abort;
	93	data->in[0][i] = rv >> 4;
	94
	95	rv = i2c_smbus_read_byte_data(client,
	96	ADC128_REG_IN_MIN(i));
	97	if (rv < 0)
	98	goto abort;
	99	data->in[1][i] = rv << 4;
	100
	101	rv = i2c_smbus_read_byte_data(client,
	102	ADC128_REG_IN_MAX(i));
	103	if (rv < 0)
	104	goto abort;
	105	data->in[2][i] = rv << 4;
	106	}
	107
4e1796c8 AK	108	if (data->mode != 1) {
	109	rv = i2c_smbus_read_word_swapped(client,
	110	ADC128_REG_TEMP);
	111	if (rv < 0)
	112	goto abort;
	113	data->temp[0] = rv >> 7;
b4c9c1a7	114
4e1796c8 AK	115	rv = i2c_smbus_read_byte_data(client,
	116	ADC128_REG_TEMP_MAX);
	117	if (rv < 0)
	118	goto abort;
	119	data->temp[1] = rv << 1;
b4c9c1a7	120
4e1796c8 AK	121	rv = i2c_smbus_read_byte_data(client,
	122	ADC128_REG_TEMP_HYST);
	123	if (rv < 0)
	124	goto abort;
	125	data->temp[2] = rv << 1;
	126	}
b4c9c1a7 GR	127
	128	rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
	129	if (rv < 0)
	130	goto abort;
	131	data->alarms \|= rv;
	132
	133	data->last_updated = jiffies;
	134	data->valid = true;
	135	}
	136	goto done;
	137
	138	abort:
	139	ret = ERR_PTR(rv);
	140	data->valid = false;
	141	done:
	142	mutex_unlock(&data->update_lock);
	143	return ret;
	144	}
	145
0594462f GR	146	static ssize_t adc128_in_show(struct device *dev,
0594462f GR	147	struct device_attribute attr, char buf)
b4c9c1a7 GR	148	{
	149	struct adc128_data *data = adc128_update_device(dev);
	150	int index = to_sensor_dev_attr_2(attr)->index;
	151	int nr = to_sensor_dev_attr_2(attr)->nr;
	152	int val;
	153
	154	if (IS_ERR(data))
	155	return PTR_ERR(data);
	156
	157	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
	158	return sprintf(buf, "%d\n", val);
	159	}
	160
0594462f GR	161	static ssize_t adc128_in_store(struct device *dev,
	162	struct device_attribute attr, const char buf,
	163	size_t count)
b4c9c1a7 GR	164	{
	165	struct adc128_data *data = dev_get_drvdata(dev);
	166	int index = to_sensor_dev_attr_2(attr)->index;
	167	int nr = to_sensor_dev_attr_2(attr)->nr;
	168	u8 reg, regval;
	169	long val;
	170	int err;
	171
	172	err = kstrtol(buf, 10, &val);
	173	if (err < 0)
	174	return err;
	175
	176	mutex_lock(&data->update_lock);
	177	/* 10 mV LSB on limit registers */
	178	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
	179	data->in[index][nr] = regval << 4;
	180	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
	181	i2c_smbus_write_byte_data(data->client, reg, regval);
	182	mutex_unlock(&data->update_lock);
	183
	184	return count;
	185	}
	186
0594462f	187	static ssize_t adc128_temp_show(struct device *dev,
b4c9c1a7 GR	188	struct device_attribute attr, char buf)
	189	{
	190	struct adc128_data *data = adc128_update_device(dev);
	191	int index = to_sensor_dev_attr(attr)->index;
	192	int temp;
	193
	194	if (IS_ERR(data))
	195	return PTR_ERR(data);
	196
2c3b1189	197	temp = sign_extend32(data->temp[index], 8);
b4c9c1a7 GR	198	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
	199	}
	200
0594462f GR	201	static ssize_t adc128_temp_store(struct device *dev,
	202	struct device_attribute *attr,
	203	const char *buf, size_t count)
b4c9c1a7 GR	204	{
	205	struct adc128_data *data = dev_get_drvdata(dev);
	206	int index = to_sensor_dev_attr(attr)->index;
	207	long val;
	208	int err;
	209	s8 regval;
	210
	211	err = kstrtol(buf, 10, &val);
	212	if (err < 0)
	213	return err;
	214
	215	mutex_lock(&data->update_lock);
	216	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	217	data->temp[index] = regval << 1;
	218	i2c_smbus_write_byte_data(data->client,
	219	index == 1 ? ADC128_REG_TEMP_MAX
	220	: ADC128_REG_TEMP_HYST,
	221	regval);
	222	mutex_unlock(&data->update_lock);
	223
	224	return count;
	225	}
	226
0594462f	227	static ssize_t adc128_alarm_show(struct device *dev,
b4c9c1a7 GR	228	struct device_attribute attr, char buf)
	229	{
	230	struct adc128_data *data = adc128_update_device(dev);
	231	int mask = 1 << to_sensor_dev_attr(attr)->index;
	232	u8 alarms;
	233
	234	if (IS_ERR(data))
	235	return PTR_ERR(data);
	236
	237	/*
	238	* Clear an alarm after reporting it to user space. If it is still
	239	* active, the next update sequence will set the alarm bit again.
	240	*/
	241	alarms = data->alarms;
	242	data->alarms &= ~mask;
	243
	244	return sprintf(buf, "%u\n", !!(alarms & mask));
	245	}
	246
4e1796c8 AK	247	static umode_t adc128_is_visible(struct kobject *kobj,
	248	struct attribute *attr, int index)
	249	{
9d2227bb	250	struct device *dev = kobj_to_dev(kobj);
4e1796c8 AK	251	struct adc128_data *data = dev_get_drvdata(dev);
	252
	253	if (index < ADC128_ATTR_NUM_VOLT) {
	254	/* Voltage, visible according to num_inputs[] */
	255	if (index >= num_inputs[data->mode] * 4)
	256	return 0;
	257	} else {
	258	/* Temperature, visible if not in mode 1 */
	259	if (data->mode == 1)
	260	return 0;
	261	}
	262
	263	return attr->mode;
	264	}
	265
0594462f GR	266	static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
	267	static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
	268	static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
	269
	270	static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
	271	static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
	272	static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
	273
	274	static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
	275	static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
	276	static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
	277
	278	static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
	279	static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
	280	static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
	281
	282	static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
	283	static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
	284	static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
	285
	286	static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
	287	static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
	288	static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
	289
	290	static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
	291	static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
	292	static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
	293
	294	static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
	295	static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
	296	static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
	297
	298	static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
	299	static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
	300	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
	301
	302	static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
	303	static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
	304	static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
	305	static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
	306	static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
	307	static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
	308	static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
	309	static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
	310	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
b4c9c1a7 GR	311
b4c9c1a7 GR	312	static struct attribute *adc128_attrs[] = {
4e1796c8	313	&sensor_dev_attr_in0_alarm.dev_attr.attr,
b4c9c1a7	314	&sensor_dev_attr_in0_input.dev_attr.attr,
4e1796c8 AK	315	&sensor_dev_attr_in0_max.dev_attr.attr,
	316	&sensor_dev_attr_in0_min.dev_attr.attr,
	317	&sensor_dev_attr_in1_alarm.dev_attr.attr,
b4c9c1a7	318	&sensor_dev_attr_in1_input.dev_attr.attr,
4e1796c8 AK	319	&sensor_dev_attr_in1_max.dev_attr.attr,
	320	&sensor_dev_attr_in1_min.dev_attr.attr,
	321	&sensor_dev_attr_in2_alarm.dev_attr.attr,
b4c9c1a7	322	&sensor_dev_attr_in2_input.dev_attr.attr,
4e1796c8 AK	323	&sensor_dev_attr_in2_max.dev_attr.attr,
	324	&sensor_dev_attr_in2_min.dev_attr.attr,
	325	&sensor_dev_attr_in3_alarm.dev_attr.attr,
b4c9c1a7	326	&sensor_dev_attr_in3_input.dev_attr.attr,
4e1796c8 AK	327	&sensor_dev_attr_in3_max.dev_attr.attr,
	328	&sensor_dev_attr_in3_min.dev_attr.attr,
	329	&sensor_dev_attr_in4_alarm.dev_attr.attr,
b4c9c1a7	330	&sensor_dev_attr_in4_input.dev_attr.attr,
4e1796c8 AK	331	&sensor_dev_attr_in4_max.dev_attr.attr,
	332	&sensor_dev_attr_in4_min.dev_attr.attr,
	333	&sensor_dev_attr_in5_alarm.dev_attr.attr,
b4c9c1a7	334	&sensor_dev_attr_in5_input.dev_attr.attr,
4e1796c8 AK	335	&sensor_dev_attr_in5_max.dev_attr.attr,
	336	&sensor_dev_attr_in5_min.dev_attr.attr,
	337	&sensor_dev_attr_in6_alarm.dev_attr.attr,
b4c9c1a7	338	&sensor_dev_attr_in6_input.dev_attr.attr,
4e1796c8 AK	339	&sensor_dev_attr_in6_max.dev_attr.attr,
	340	&sensor_dev_attr_in6_min.dev_attr.attr,
	341	&sensor_dev_attr_in7_alarm.dev_attr.attr,
	342	&sensor_dev_attr_in7_input.dev_attr.attr,
	343	&sensor_dev_attr_in7_max.dev_attr.attr,
	344	&sensor_dev_attr_in7_min.dev_attr.attr,
b4c9c1a7 GR	345	&sensor_dev_attr_temp1_input.dev_attr.attr,
b4c9c1a7 GR	346	&sensor_dev_attr_temp1_max.dev_attr.attr,
b4c9c1a7	347	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
4e1796c8	348	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
b4c9c1a7 GR	349	NULL
b4c9c1a7 GR	350	};
4e1796c8	351
33d62d11	352	static const struct attribute_group adc128_group = {
4e1796c8 AK	353	.attrs = adc128_attrs,
	354	.is_visible = adc128_is_visible,
	355	};
	356	__ATTRIBUTE_GROUPS(adc128);
b4c9c1a7 GR	357
	358	static int adc128_detect(struct i2c_client client, struct i2c_board_info info)
	359	{
	360	int man_id, dev_id;
	361
	362	if (!i2c_check_functionality(client->adapter,
	363	I2C_FUNC_SMBUS_BYTE_DATA \|
	364	I2C_FUNC_SMBUS_WORD_DATA))
	365	return -ENODEV;
	366
	367	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
	368	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
	369	if (man_id != 0x01 \|\| dev_id != 0x09)
	370	return -ENODEV;
	371
	372	/* Check unused bits for confirmation */
	373	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
	374	return -ENODEV;
	375	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
	376	return -ENODEV;
	377	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
	378	return -ENODEV;
	379	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
	380	return -ENODEV;
	381	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
	382	return -ENODEV;
	383	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
	384	return -ENODEV;
	385
f2f394db	386	strscpy(info->type, "adc128d818", I2C_NAME_SIZE);
b4c9c1a7 GR	387
	388	return 0;
	389	}
	390
cffb8d74	391	static int adc128_init_client(struct adc128_data *data, bool external_vref)
b4c9c1a7 GR	392	{
	393	struct i2c_client *client = data->client;
	394	int err;
e2f75e6b	395	u8 regval = 0x0;
b4c9c1a7 GR	396
	397	/*
	398	* Reset chip to defaults.
	399	* This makes most other initializations unnecessary.
	400	*/
	401	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
	402	if (err)
	403	return err;
	404
a45923c2	405	/* Set operation mode, if non-default */
e2f75e6b RD	406	if (data->mode != 0)
	407	regval \|= data->mode << 1;
	408
	409	/* If external vref is selected, configure the chip to use it */
cffb8d74	410	if (external_vref)
e2f75e6b RD	411	regval \|= 0x01;
	412
	413	/* Write advanced configuration register */
	414	if (regval != 0x0) {
	415	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
	416	regval);
a45923c2 AK	417	if (err)
	418	return err;
	419	}
	420
b4c9c1a7 GR	421	/* Start monitoring */
	422	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
	423	if (err)
	424	return err;
	425
b4c9c1a7 GR	426	return 0;
	427	}
	428
673afe46	429	static int adc128_probe(struct i2c_client *client)
b4c9c1a7 GR	430	{
b4c9c1a7 GR	431	struct device *dev = &client->dev;
b4c9c1a7 GR	432	struct device *hwmon_dev;
b4c9c1a7 GR	433	struct adc128_data *data;
cffb8d74	434	bool external_vref;
b4c9c1a7 GR	435	int err, vref;
	436
	437	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
	438	if (!data)
	439	return -ENOMEM;
	440
	441	/* vref is optional. If specified, is used as chip reference voltage */
cffb8d74 DL	442	vref = devm_regulator_get_enable_read_voltage(dev, "vref");
	443	if (vref == -ENODEV) {
	444	external_vref = false;
b4c9c1a7	445	data->vref = 2560; /* 2.56V, in mV */
cffb8d74 DL	446	} else if (vref < 0) {
	447	return vref;
	448	} else {
	449	external_vref = true;
	450	data->vref = DIV_ROUND_CLOSEST(vref, 1000);
b4c9c1a7 GR	451	}
b4c9c1a7 GR	452
c72eeabd	453	/* Operation mode is optional. If unspecified, keep current mode */
a45923c2	454	if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
4e1796c8 AK	455	if (data->mode > 3) {
4e1796c8 AK	456	dev_err(dev, "invalid operation mode %d\n",
a45923c2	457	data->mode);
cffb8d74	458	return -EINVAL;
a45923c2 AK	459	}
a45923c2 AK	460	} else {
c72eeabd AK	461	err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
c72eeabd AK	462	if (err < 0)
cffb8d74	463	return err;
c72eeabd	464	data->mode = (err >> 1) & ADC128_REG_MASK;
a45923c2 AK	465	}
a45923c2 AK	466
b4c9c1a7 GR	467	data->client = client;
	468	i2c_set_clientdata(client, data);
	469	mutex_init(&data->update_lock);
	470
	471	/* Initialize the chip */
cffb8d74	472	err = adc128_init_client(data, external_vref);
b4c9c1a7	473	if (err < 0)
cffb8d74	474	return err;
b4c9c1a7 GR	475
	476	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	477	data, adc128_groups);
cffb8d74 DL	478	if (IS_ERR(hwmon_dev))
cffb8d74 DL	479	return PTR_ERR(hwmon_dev);
b4c9c1a7 GR	480
b4c9c1a7 GR	481	return 0;
b4c9c1a7 GR	482	}
	483
	484	static const struct i2c_device_id adc128_id[] = {
	485	{ "adc128d818", 0 },
	486	{ }
	487	};
	488	MODULE_DEVICE_TABLE(i2c, adc128_id);
	489
462d7e7e	490	static const struct of_device_id __maybe_unused adc128_of_match[] = {
d593e665 JMC	491	{ .compatible = "ti,adc128d818" },
	492	{ },
	493	};
	494	MODULE_DEVICE_TABLE(of, adc128_of_match);
	495
b4c9c1a7 GR	496	static struct i2c_driver adc128_driver = {
	497	.class = I2C_CLASS_HWMON,
	498	.driver = {
	499	.name = "adc128d818",
d593e665	500	.of_match_table = of_match_ptr(adc128_of_match),
b4c9c1a7	501	},
1975d167	502	.probe = adc128_probe,
b4c9c1a7 GR	503	.id_table = adc128_id,
	504	.detect = adc128_detect,
	505	.address_list = normal_i2c,
	506	};
	507
	508	module_i2c_driver(adc128_driver);
	509
	510	MODULE_AUTHOR("Guenter Roeck");
	511	MODULE_DESCRIPTION("Driver for ADC128D818");
	512	MODULE_LICENSE("GPL");