[mirror_ubuntu-jammy-kernel.git] / drivers / hwmon / max6639.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * max6639.c - Support for Maxim MAX6639
 *
 * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
 *
 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
 *
 * based on the initial MAX6639 support from semptian.net
 * by He Changqing <hechangqing@semptian.com>
 */

#include <linux/module.h>
#include <linux/init.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/mutex.h>
#include <linux/platform_data/max6639.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };

/* The MAX6639 registers, valid channel numbers: 0, 1 */
#define MAX6639_REG_TEMP(ch)			(0x00 + (ch))
#define MAX6639_REG_STATUS			0x02
#define MAX6639_REG_OUTPUT_MASK			0x03
#define MAX6639_REG_GCONFIG			0x04
#define MAX6639_REG_TEMP_EXT(ch)		(0x05 + (ch))
#define MAX6639_REG_ALERT_LIMIT(ch)		(0x08 + (ch))
#define MAX6639_REG_OT_LIMIT(ch)		(0x0A + (ch))
#define MAX6639_REG_THERM_LIMIT(ch)		(0x0C + (ch))
#define MAX6639_REG_FAN_CONFIG1(ch)		(0x10 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2a(ch)		(0x11 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2b(ch)		(0x12 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG3(ch)		(0x13 + (ch) * 4)
#define MAX6639_REG_FAN_CNT(ch)			(0x20 + (ch))
#define MAX6639_REG_TARGET_CNT(ch)		(0x22 + (ch))
#define MAX6639_REG_FAN_PPR(ch)			(0x24 + (ch))
#define MAX6639_REG_TARGTDUTY(ch)		(0x26 + (ch))
#define MAX6639_REG_FAN_START_TEMP(ch)		(0x28 + (ch))
#define MAX6639_REG_DEVID			0x3D
#define MAX6639_REG_MANUID			0x3E
#define MAX6639_REG_DEVREV			0x3F

/* Register bits */
#define MAX6639_GCONFIG_STANDBY			0x80
#define MAX6639_GCONFIG_POR			0x40
#define MAX6639_GCONFIG_DISABLE_TIMEOUT		0x20
#define MAX6639_GCONFIG_CH2_LOCAL		0x10
#define MAX6639_GCONFIG_PWM_FREQ_HI		0x08

#define MAX6639_FAN_CONFIG1_PWM			0x80

#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED	0x40

static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };

#define FAN_FROM_REG(val, rpm_range)	((val) == 0 || (val) == 255 ? \
				0 : (rpm_ranges[rpm_range] * 30) / (val))
#define TEMP_LIMIT_TO_REG(val)	clamp_val((val) / 1000, 0, 255)

/*
 * Client data (each client gets its own)
 */
struct max6639_data {
	struct i2c_client *client;
	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* Register values sampled regularly */
	u16 temp[2];		/* Temperature, in 1/8 C, 0..255 C */
	bool temp_fault[2];	/* Detected temperature diode failure */
	u8 fan[2];		/* Register value: TACH count for fans >=30 */
	u8 status;		/* Detected channel alarms and fan failures */

	/* Register values only written to */
	u8 pwm[2];		/* Register value: Duty cycle 0..120 */
	u8 temp_therm[2];	/* THERM Temperature, 0..255 C (->_max) */
	u8 temp_alert[2];	/* ALERT Temperature, 0..255 C (->_crit) */
	u8 temp_ot[2];		/* OT Temperature, 0..255 C (->_emergency) */

	/* Register values initialized only once */
	u8 ppr;			/* Pulses per rotation 0..3 for 1..4 ppr */
	u8 rpm_range;		/* Index in above rpm_ranges table */
};

static struct max6639_data *max6639_update_device(struct device *dev)
{
	struct max6639_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	struct max6639_data *ret = data;
	int i;
	int status_reg;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
		int res;

		dev_dbg(&client->dev, "Starting max6639 update\n");

		status_reg = i2c_smbus_read_byte_data(client,
						      MAX6639_REG_STATUS);
		if (status_reg < 0) {
			ret = ERR_PTR(status_reg);
			goto abort;
		}

		data->status = status_reg;

		for (i = 0; i < 2; i++) {
			res = i2c_smbus_read_byte_data(client,
					MAX6639_REG_FAN_CNT(i));
			if (res < 0) {
				ret = ERR_PTR(res);
				goto abort;
			}
			data->fan[i] = res;

			res = i2c_smbus_read_byte_data(client,
					MAX6639_REG_TEMP_EXT(i));
			if (res < 0) {
				ret = ERR_PTR(res);
				goto abort;
			}
			data->temp[i] = res >> 5;
			data->temp_fault[i] = res & 0x01;

			res = i2c_smbus_read_byte_data(client,
					MAX6639_REG_TEMP(i));
			if (res < 0) {
				ret = ERR_PTR(res);
				goto abort;
			}
			data->temp[i] |= res << 3;
		}

		data->last_updated = jiffies;
		data->valid = 1;
	}
abort:
	mutex_unlock(&data->update_lock);

	return ret;
}

static ssize_t temp_input_show(struct device *dev,
			       struct device_attribute *dev_attr, char *buf)
{
	long temp;
	struct max6639_data *data = max6639_update_device(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

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

	temp = data->temp[attr->index] * 125;
	return sprintf(buf, "%ld\n", temp);
}

static ssize_t temp_fault_show(struct device *dev,
			       struct device_attribute *dev_attr, char *buf)
{
	struct max6639_data *data = max6639_update_device(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

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

	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
}

static ssize_t temp_max_show(struct device *dev,
			     struct device_attribute *dev_attr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
}

static ssize_t temp_max_store(struct device *dev,
			      struct device_attribute *dev_attr,
			      const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;
	int res;

	res = kstrtoul(buf, 10, &val);
	if (res)
		return res;

	mutex_lock(&data->update_lock);
	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
	i2c_smbus_write_byte_data(client,
				  MAX6639_REG_THERM_LIMIT(attr->index),
				  data->temp_therm[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t temp_crit_show(struct device *dev,
			      struct device_attribute *dev_attr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
}

static ssize_t temp_crit_store(struct device *dev,
			       struct device_attribute *dev_attr,
			       const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;
	int res;

	res = kstrtoul(buf, 10, &val);
	if (res)
		return res;

	mutex_lock(&data->update_lock);
	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
	i2c_smbus_write_byte_data(client,
				  MAX6639_REG_ALERT_LIMIT(attr->index),
				  data->temp_alert[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t temp_emergency_show(struct device *dev,
				   struct device_attribute *dev_attr,
				   char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
}

static ssize_t temp_emergency_store(struct device *dev,
				    struct device_attribute *dev_attr,
				    const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;
	int res;

	res = kstrtoul(buf, 10, &val);
	if (res)
		return res;

	mutex_lock(&data->update_lock);
	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
	i2c_smbus_write_byte_data(client,
				  MAX6639_REG_OT_LIMIT(attr->index),
				  data->temp_ot[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
			char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
}

static ssize_t pwm_store(struct device *dev,
			 struct device_attribute *dev_attr, const char *buf,
			 size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6639_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;
	int res;

	res = kstrtoul(buf, 10, &val);
	if (res)
		return res;

	val = clamp_val(val, 0, 255);

	mutex_lock(&data->update_lock);
	data->pwm[attr->index] = (u8)(val * 120 / 255);
	i2c_smbus_write_byte_data(client,
				  MAX6639_REG_TARGTDUTY(attr->index),
				  data->pwm[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t fan_input_show(struct device *dev,
			      struct device_attribute *dev_attr, char *buf)
{
	struct max6639_data *data = max6639_update_device(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

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

	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
		       data->rpm_range));
}

static ssize_t alarm_show(struct device *dev,
			  struct device_attribute *dev_attr, char *buf)
{
	struct max6639_data *data = max6639_update_device(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

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

	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);


static struct attribute *max6639_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp1_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
	&sensor_dev_attr_temp2_emergency.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm2.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan1_fault.dev_attr.attr,
	&sensor_dev_attr_fan2_fault.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(max6639);

/*
 *  returns respective index in rpm_ranges table
 *  1 by default on invalid range
 */
static int rpm_range_to_reg(int range)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
		if (rpm_ranges[i] == range)
			return i;
	}

	return 1; /* default: 4000 RPM */
}

static int max6639_init_client(struct i2c_client *client,
			       struct max6639_data *data)
{
	struct max6639_platform_data *max6639_info =
		dev_get_platdata(&client->dev);
	int i;
	int rpm_range = 1; /* default: 4000 RPM */
	int err;

	/* Reset chip to default values, see below for GCONFIG setup */
	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
				  MAX6639_GCONFIG_POR);
	if (err)
		goto exit;

	/* Fans pulse per revolution is 2 by default */
	if (max6639_info && max6639_info->ppr > 0 &&
			max6639_info->ppr < 5)
		data->ppr = max6639_info->ppr;
	else
		data->ppr = 2;
	data->ppr -= 1;

	if (max6639_info)
		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
	data->rpm_range = rpm_range;

	for (i = 0; i < 2; i++) {

		/* Set Fan pulse per revolution */
		err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_FAN_PPR(i),
				data->ppr << 6);
		if (err)
			goto exit;

		/* Fans config PWM, RPM */
		err = i2c_smbus_write_byte_data(client,
			MAX6639_REG_FAN_CONFIG1(i),
			MAX6639_FAN_CONFIG1_PWM | rpm_range);
		if (err)
			goto exit;

		/* Fans PWM polarity high by default */
		if (max6639_info && max6639_info->pwm_polarity == 0)
			err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_FAN_CONFIG2a(i), 0x00);
		else
			err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_FAN_CONFIG2a(i), 0x02);
		if (err)
			goto exit;

		/*
		 * /THERM full speed enable,
		 * PWM frequency 25kHz, see also GCONFIG below
		 */
		err = i2c_smbus_write_byte_data(client,
			MAX6639_REG_FAN_CONFIG3(i),
			MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
		if (err)
			goto exit;

		/* Max. temp. 80C/90C/100C */
		data->temp_therm[i] = 80;
		data->temp_alert[i] = 90;
		data->temp_ot[i] = 100;
		err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_THERM_LIMIT(i),
				data->temp_therm[i]);
		if (err)
			goto exit;
		err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_ALERT_LIMIT(i),
				data->temp_alert[i]);
		if (err)
			goto exit;
		err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
		if (err)
			goto exit;

		/* PWM 120/120 (i.e. 100%) */
		data->pwm[i] = 120;
		err = i2c_smbus_write_byte_data(client,
				MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
		if (err)
			goto exit;
	}
	/* Start monitoring */
	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
		MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
		MAX6639_GCONFIG_PWM_FREQ_HI);
exit:
	return err;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int max6639_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	int dev_id, manu_id;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	/* Actual detection via device and manufacturer ID */
	dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
	manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
	if (dev_id != 0x58 || manu_id != 0x4D)
		return -ENODEV;

	strlcpy(info->type, "max6639", I2C_NAME_SIZE);

	return 0;
}

static int max6639_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct max6639_data *data;
	struct device *hwmon_dev;
	int err;

	data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the max6639 chip */
	err = max6639_init_client(client, data);
	if (err < 0)
		return err;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data,
							   max6639_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

#ifdef CONFIG_PM_SLEEP
static int max6639_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	if (data < 0)
		return data;

	return i2c_smbus_write_byte_data(client,
			MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
}

static int max6639_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	if (data < 0)
		return data;

	return i2c_smbus_write_byte_data(client,
			MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
}
#endif /* CONFIG_PM_SLEEP */

static const struct i2c_device_id max6639_id[] = {
	{"max6639", 0},
	{ }
};

MODULE_DEVICE_TABLE(i2c, max6639_id);

static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);

static struct i2c_driver max6639_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		   .name = "max6639",
		   .pm = &max6639_pm_ops,
		   },
	.probe_new = max6639_probe,
	.id_table = max6639_id,
	.detect = max6639_detect,
	.address_list = normal_i2c,
};

module_i2c_driver(max6639_driver);

MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("max6639 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
a5b79d62	2	/*
	3	* max6639.c - Support for Maxim MAX6639
	4	*
	5	* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
	6	*
	7	* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
	8	*
	9	* based on the initial MAX6639 support from semptian.net
	10	* by He Changqing <hechangqing@semptian.com>
a5b79d62	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/slab.h>
	16	#include <linux/jiffies.h>
	17	#include <linux/i2c.h>
	18	#include <linux/hwmon.h>
	19	#include <linux/hwmon-sysfs.h>
	20	#include <linux/err.h>
	21	#include <linux/mutex.h>
0c9fe161	22	#include <linux/platform_data/max6639.h>
a5b79d62	23
a5b79d62	24	/* Addresses to scan */
7edc8cc1	25	static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
a5b79d62	26
	27	/* The MAX6639 registers, valid channel numbers: 0, 1 */
	28	#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
	29	#define MAX6639_REG_STATUS 0x02
	30	#define MAX6639_REG_OUTPUT_MASK 0x03
	31	#define MAX6639_REG_GCONFIG 0x04
	32	#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
	33	#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
	34	#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
	35	#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
	36	#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
	37	#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
	38	#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
	39	#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
	40	#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
	41	#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
	42	#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
	43	#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
	44	#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
	45	#define MAX6639_REG_DEVID 0x3D
	46	#define MAX6639_REG_MANUID 0x3E
	47	#define MAX6639_REG_DEVREV 0x3F
	48
	49	/* Register bits */
	50	#define MAX6639_GCONFIG_STANDBY 0x80
	51	#define MAX6639_GCONFIG_POR 0x40
	52	#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
	53	#define MAX6639_GCONFIG_CH2_LOCAL 0x10
177f3b92	54	#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
a5b79d62	55
	56	#define MAX6639_FAN_CONFIG1_PWM 0x80
	57
177f3b92	58	#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
177f3b92	59
a5b79d62	60	static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
a5b79d62	61
b63d97a3 CS	62	#define FAN_FROM_REG(val, rpm_range) ((val) == 0 \|\| (val) == 255 ? \
b63d97a3 CS	63	0 : (rpm_ranges[rpm_range] * 30) / (val))
2a844c14	64	#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
a5b79d62	65
	66	/*
	67	* Client data (each client gets its own)
	68	*/
	69	struct max6639_data {
7981c584	70	struct i2c_client *client;
a5b79d62	71	struct mutex update_lock;
	72	char valid; /* !=0 if following fields are valid */
	73	unsigned long last_updated; /* In jiffies */
	74
	75	/* Register values sampled regularly */
	76	u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
	77	bool temp_fault[2]; /* Detected temperature diode failure */
	78	u8 fan[2]; /* Register value: TACH count for fans >=30 */
	79	u8 status; /* Detected channel alarms and fan failures */
	80
	81	/* Register values only written to */
	82	u8 pwm[2]; /* Register value: Duty cycle 0..120 */
	83	u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
	84	u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
	85	u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
	86
	87	/* Register values initialized only once */
	88	u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
	89	u8 rpm_range; /* Index in above rpm_ranges table */
	90	};
	91
	92	static struct max6639_data max6639_update_device(struct device dev)
	93	{
7981c584 GR	94	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	95	struct i2c_client *client = data->client;
a5b79d62	96	struct max6639_data *ret = data;
	97	int i;
	98	int status_reg;
	99
	100	mutex_lock(&data->update_lock);
	101
	102	if (time_after(jiffies, data->last_updated + 2 * HZ) \|\| !data->valid) {
	103	int res;
	104
	105	dev_dbg(&client->dev, "Starting max6639 update\n");
	106
	107	status_reg = i2c_smbus_read_byte_data(client,
	108	MAX6639_REG_STATUS);
	109	if (status_reg < 0) {
	110	ret = ERR_PTR(status_reg);
	111	goto abort;
	112	}
	113
	114	data->status = status_reg;
	115
	116	for (i = 0; i < 2; i++) {
	117	res = i2c_smbus_read_byte_data(client,
	118	MAX6639_REG_FAN_CNT(i));
	119	if (res < 0) {
	120	ret = ERR_PTR(res);
	121	goto abort;
	122	}
	123	data->fan[i] = res;
	124
	125	res = i2c_smbus_read_byte_data(client,
	126	MAX6639_REG_TEMP_EXT(i));
	127	if (res < 0) {
	128	ret = ERR_PTR(res);
	129	goto abort;
	130	}
	131	data->temp[i] = res >> 5;
	132	data->temp_fault[i] = res & 0x01;
	133
	134	res = i2c_smbus_read_byte_data(client,
	135	MAX6639_REG_TEMP(i));
	136	if (res < 0) {
	137	ret = ERR_PTR(res);
	138	goto abort;
	139	}
	140	data->temp[i] \|= res << 3;
	141	}
	142
	143	data->last_updated = jiffies;
	144	data->valid = 1;
	145	}
	146	abort:
	147	mutex_unlock(&data->update_lock);
	148
	149	return ret;
	150	}
	151
0a0ab22a	152	static ssize_t temp_input_show(struct device *dev,
a5b79d62	153	struct device_attribute dev_attr, char buf)
	154	{
	155	long temp;
	156	struct max6639_data *data = max6639_update_device(dev);
	157	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	158
	159	if (IS_ERR(data))
	160	return PTR_ERR(data);
	161
	162	temp = data->temp[attr->index] * 125;
	163	return sprintf(buf, "%ld\n", temp);
	164	}
	165
0a0ab22a	166	static ssize_t temp_fault_show(struct device *dev,
a5b79d62	167	struct device_attribute dev_attr, char buf)
	168	{
	169	struct max6639_data *data = max6639_update_device(dev);
	170	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	171
	172	if (IS_ERR(data))
	173	return PTR_ERR(data);
	174
	175	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
	176	}
	177
0a0ab22a	178	static ssize_t temp_max_show(struct device *dev,
a5b79d62	179	struct device_attribute dev_attr, char buf)
a5b79d62	180	{
a5b79d62	181	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	182	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	183
	184	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
	185	}
	186
0a0ab22a GR	187	static ssize_t temp_max_store(struct device *dev,
	188	struct device_attribute *dev_attr,
	189	const char *buf, size_t count)
a5b79d62	190	{
a5b79d62	191	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	192	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	193	struct i2c_client *client = data->client;
a5b79d62	194	unsigned long val;
	195	int res;
	196
179c4fdb	197	res = kstrtoul(buf, 10, &val);
a5b79d62	198	if (res)
	199	return res;
	200
	201	mutex_lock(&data->update_lock);
	202	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
	203	i2c_smbus_write_byte_data(client,
	204	MAX6639_REG_THERM_LIMIT(attr->index),
	205	data->temp_therm[attr->index]);
	206	mutex_unlock(&data->update_lock);
	207	return count;
	208	}
	209
0a0ab22a	210	static ssize_t temp_crit_show(struct device *dev,
a5b79d62	211	struct device_attribute dev_attr, char buf)
a5b79d62	212	{
a5b79d62	213	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	214	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	215
	216	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
	217	}
	218
0a0ab22a GR	219	static ssize_t temp_crit_store(struct device *dev,
	220	struct device_attribute *dev_attr,
	221	const char *buf, size_t count)
a5b79d62	222	{
a5b79d62	223	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	224	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	225	struct i2c_client *client = data->client;
a5b79d62	226	unsigned long val;
	227	int res;
	228
179c4fdb	229	res = kstrtoul(buf, 10, &val);
a5b79d62	230	if (res)
	231	return res;
	232
	233	mutex_lock(&data->update_lock);
	234	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
	235	i2c_smbus_write_byte_data(client,
	236	MAX6639_REG_ALERT_LIMIT(attr->index),
	237	data->temp_alert[attr->index]);
	238	mutex_unlock(&data->update_lock);
	239	return count;
	240	}
	241
0a0ab22a	242	static ssize_t temp_emergency_show(struct device *dev,
a5b79d62	243	struct device_attribute *dev_attr,
	244	char *buf)
	245	{
a5b79d62	246	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	247	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	248
	249	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
	250	}
	251
0a0ab22a GR	252	static ssize_t temp_emergency_store(struct device *dev,
	253	struct device_attribute *dev_attr,
	254	const char *buf, size_t count)
a5b79d62	255	{
a5b79d62	256	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	257	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	258	struct i2c_client *client = data->client;
a5b79d62	259	unsigned long val;
	260	int res;
	261
179c4fdb	262	res = kstrtoul(buf, 10, &val);
a5b79d62	263	if (res)
	264	return res;
	265
	266	mutex_lock(&data->update_lock);
	267	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
	268	i2c_smbus_write_byte_data(client,
	269	MAX6639_REG_OT_LIMIT(attr->index),
	270	data->temp_ot[attr->index]);
	271	mutex_unlock(&data->update_lock);
	272	return count;
	273	}
	274
0a0ab22a GR	275	static ssize_t pwm_show(struct device dev, struct device_attribute dev_attr,
0a0ab22a GR	276	char *buf)
a5b79d62	277	{
a5b79d62	278	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	279	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	280
	281	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
	282	}
	283
0a0ab22a GR	284	static ssize_t pwm_store(struct device *dev,
	285	struct device_attribute dev_attr, const char buf,
	286	size_t count)
a5b79d62	287	{
a5b79d62	288	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	289	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	290	struct i2c_client *client = data->client;
a5b79d62	291	unsigned long val;
	292	int res;
	293
179c4fdb	294	res = kstrtoul(buf, 10, &val);
a5b79d62	295	if (res)
	296	return res;
	297
2a844c14	298	val = clamp_val(val, 0, 255);
a5b79d62	299
	300	mutex_lock(&data->update_lock);
	301	data->pwm[attr->index] = (u8)(val * 120 / 255);
	302	i2c_smbus_write_byte_data(client,
	303	MAX6639_REG_TARGTDUTY(attr->index),
	304	data->pwm[attr->index]);
	305	mutex_unlock(&data->update_lock);
	306	return count;
	307	}
	308
0a0ab22a	309	static ssize_t fan_input_show(struct device *dev,
a5b79d62	310	struct device_attribute dev_attr, char buf)
	311	{
	312	struct max6639_data *data = max6639_update_device(dev);
	313	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	314
	315	if (IS_ERR(data))
	316	return PTR_ERR(data);
	317
	318	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
b63d97a3	319	data->rpm_range));
a5b79d62	320	}
a5b79d62	321
0a0ab22a	322	static ssize_t alarm_show(struct device *dev,
a5b79d62	323	struct device_attribute dev_attr, char buf)
	324	{
	325	struct max6639_data *data = max6639_update_device(dev);
	326	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	327
	328	if (IS_ERR(data))
	329	return PTR_ERR(data);
	330
	331	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
	332	}
	333
0a0ab22a GR	334	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
	335	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
	336	static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
	337	static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
	338	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
	339	static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
	340	static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
	341	static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
	342	static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
	343	static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
	344	static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
	345	static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
	346	static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
	347	static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
	348	static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
	349	static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
	350	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
	351	static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
	352	static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
	353	static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
	354	static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
	355	static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
a5b79d62	356
a5b79d62	357
7981c584	358	static struct attribute *max6639_attrs[] = {
a5b79d62	359	&sensor_dev_attr_temp1_input.dev_attr.attr,
	360	&sensor_dev_attr_temp2_input.dev_attr.attr,
	361	&sensor_dev_attr_temp1_fault.dev_attr.attr,
	362	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	363	&sensor_dev_attr_temp1_max.dev_attr.attr,
	364	&sensor_dev_attr_temp2_max.dev_attr.attr,
	365	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	366	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	367	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
	368	&sensor_dev_attr_temp2_emergency.dev_attr.attr,
	369	&sensor_dev_attr_pwm1.dev_attr.attr,
	370	&sensor_dev_attr_pwm2.dev_attr.attr,
	371	&sensor_dev_attr_fan1_input.dev_attr.attr,
	372	&sensor_dev_attr_fan2_input.dev_attr.attr,
	373	&sensor_dev_attr_fan1_fault.dev_attr.attr,
	374	&sensor_dev_attr_fan2_fault.dev_attr.attr,
	375	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	376	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	377	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	378	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	379	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
	380	&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
	381	NULL
	382	};
7981c584	383	ATTRIBUTE_GROUPS(max6639);
a5b79d62	384
	385	/*
	386	* returns respective index in rpm_ranges table
	387	* 1 by default on invalid range
	388	*/
	389	static int rpm_range_to_reg(int range)
	390	{
	391	int i;
	392
	393	for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
	394	if (rpm_ranges[i] == range)
	395	return i;
	396	}
	397
	398	return 1; /* default: 4000 RPM */
	399	}
	400
7981c584 GR	401	static int max6639_init_client(struct i2c_client *client,
7981c584 GR	402	struct max6639_data *data)
a5b79d62	403	{
a5b79d62	404	struct max6639_platform_data *max6639_info =
a8b3a3a5	405	dev_get_platdata(&client->dev);
2f2da1ac	406	int i;
a5b79d62	407	int rpm_range = 1; /* default: 4000 RPM */
2f2da1ac	408	int err;
a5b79d62	409
177f3b92	410	/* Reset chip to default values, see below for GCONFIG setup */
a5b79d62	411	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
	412	MAX6639_GCONFIG_POR);
	413	if (err)
	414	goto exit;
	415
	416	/* Fans pulse per revolution is 2 by default */
	417	if (max6639_info && max6639_info->ppr > 0 &&
	418	max6639_info->ppr < 5)
	419	data->ppr = max6639_info->ppr;
	420	else
	421	data->ppr = 2;
	422	data->ppr -= 1;
a5b79d62	423
	424	if (max6639_info)
	425	rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
	426	data->rpm_range = rpm_range;
	427
	428	for (i = 0; i < 2; i++) {
	429
2f2da1ac CS	430	/* Set Fan pulse per revolution */
	431	err = i2c_smbus_write_byte_data(client,
	432	MAX6639_REG_FAN_PPR(i),
	433	data->ppr << 6);
	434	if (err)
	435	goto exit;
	436
a5b79d62	437	/* Fans config PWM, RPM */
	438	err = i2c_smbus_write_byte_data(client,
	439	MAX6639_REG_FAN_CONFIG1(i),
	440	MAX6639_FAN_CONFIG1_PWM \| rpm_range);
	441	if (err)
	442	goto exit;
	443
	444	/* Fans PWM polarity high by default */
	445	if (max6639_info && max6639_info->pwm_polarity == 0)
	446	err = i2c_smbus_write_byte_data(client,
	447	MAX6639_REG_FAN_CONFIG2a(i), 0x00);
	448	else
	449	err = i2c_smbus_write_byte_data(client,
	450	MAX6639_REG_FAN_CONFIG2a(i), 0x02);
	451	if (err)
	452	goto exit;
	453
177f3b92	454	/*
	455	* /THERM full speed enable,
	456	* PWM frequency 25kHz, see also GCONFIG below
	457	*/
	458	err = i2c_smbus_write_byte_data(client,
	459	MAX6639_REG_FAN_CONFIG3(i),
	460	MAX6639_FAN_CONFIG3_THERM_FULL_SPEED \| 0x03);
	461	if (err)
	462	goto exit;
	463
a5b79d62	464	/* Max. temp. 80C/90C/100C */
	465	data->temp_therm[i] = 80;
	466	data->temp_alert[i] = 90;
	467	data->temp_ot[i] = 100;
	468	err = i2c_smbus_write_byte_data(client,
	469	MAX6639_REG_THERM_LIMIT(i),
	470	data->temp_therm[i]);
	471	if (err)
	472	goto exit;
	473	err = i2c_smbus_write_byte_data(client,
	474	MAX6639_REG_ALERT_LIMIT(i),
	475	data->temp_alert[i]);
	476	if (err)
	477	goto exit;
	478	err = i2c_smbus_write_byte_data(client,
	479	MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
	480	if (err)
	481	goto exit;
	482
	483	/* PWM 120/120 (i.e. 100%) */
	484	data->pwm[i] = 120;
	485	err = i2c_smbus_write_byte_data(client,
	486	MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
	487	if (err)
	488	goto exit;
	489	}
	490	/* Start monitoring */
	491	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
177f3b92	492	MAX6639_GCONFIG_DISABLE_TIMEOUT \| MAX6639_GCONFIG_CH2_LOCAL \|
177f3b92	493	MAX6639_GCONFIG_PWM_FREQ_HI);
a5b79d62	494	exit:
	495	return err;
	496	}
	497
	498	/* Return 0 if detection is successful, -ENODEV otherwise */
	499	static int max6639_detect(struct i2c_client *client,
	500	struct i2c_board_info *info)
	501	{
	502	struct i2c_adapter *adapter = client->adapter;
	503	int dev_id, manu_id;
	504
	505	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	506	return -ENODEV;
	507
	508	/* Actual detection via device and manufacturer ID */
	509	dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
	510	manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
	511	if (dev_id != 0x58 \|\| manu_id != 0x4D)
	512	return -ENODEV;
	513
	514	strlcpy(info->type, "max6639", I2C_NAME_SIZE);
	515
	516	return 0;
	517	}
	518
67487038	519	static int max6639_probe(struct i2c_client *client)
a5b79d62	520	{
c1ea0a04	521	struct device *dev = &client->dev;
a5b79d62	522	struct max6639_data *data;
7981c584	523	struct device *hwmon_dev;
a5b79d62	524	int err;
a5b79d62	525
c1ea0a04	526	data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
b07405fb GR	527	if (!data)
b07405fb GR	528	return -ENOMEM;
a5b79d62	529
7981c584	530	data->client = client;
a5b79d62	531	mutex_init(&data->update_lock);
	532
	533	/* Initialize the max6639 chip */
7981c584	534	err = max6639_init_client(client, data);
a5b79d62	535	if (err < 0)
b07405fb	536	return err;
a5b79d62	537
7981c584 GR	538	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	539	data,
	540	max6639_groups);
	541	return PTR_ERR_OR_ZERO(hwmon_dev);
a5b79d62	542	}
a5b79d62	543
52f30f77 MB	544	#ifdef CONFIG_PM_SLEEP
52f30f77 MB	545	static int max6639_suspend(struct device *dev)
a5b79d62	546	{
52f30f77	547	struct i2c_client *client = to_i2c_client(dev);
a5b79d62	548	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	549	if (data < 0)
	550	return data;
	551
	552	return i2c_smbus_write_byte_data(client,
	553	MAX6639_REG_GCONFIG, data \| MAX6639_GCONFIG_STANDBY);
	554	}
	555
52f30f77	556	static int max6639_resume(struct device *dev)
a5b79d62	557	{
52f30f77	558	struct i2c_client *client = to_i2c_client(dev);
a5b79d62	559	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	560	if (data < 0)
	561	return data;
	562
	563	return i2c_smbus_write_byte_data(client,
	564	MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
	565	}
52f30f77	566	#endif /* CONFIG_PM_SLEEP */
a5b79d62	567
	568	static const struct i2c_device_id max6639_id[] = {
	569	{"max6639", 0},
	570	{ }
	571	};
	572
	573	MODULE_DEVICE_TABLE(i2c, max6639_id);
	574
768821a3	575	static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
52f30f77	576
a5b79d62	577	static struct i2c_driver max6639_driver = {
	578	.class = I2C_CLASS_HWMON,
	579	.driver = {
	580	.name = "max6639",
52f30f77	581	.pm = &max6639_pm_ops,
a5b79d62	582	},
67487038	583	.probe_new = max6639_probe,
a5b79d62	584	.id_table = max6639_id,
	585	.detect = max6639_detect,
	586	.address_list = normal_i2c,
	587	};
	588
f0967eea	589	module_i2c_driver(max6639_driver);
a5b79d62	590
	591	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	592	MODULE_DESCRIPTION("max6639 driver");
	593	MODULE_LICENSE("GPL");