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

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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 show_temp_input(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 show_temp_fault(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 show_temp_max(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 set_temp_max(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 show_temp_crit(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 set_temp_crit(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 show_temp_emergency(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 set_temp_emergency(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 show_pwm(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 set_pwm(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 show_fan_input(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 show_alarm(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(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
		set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
		set_temp_max, 1);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
		set_temp_crit, 0);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
		set_temp_crit, 1);
static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO,
		show_temp_emergency, set_temp_emergency, 0);
static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO,
		show_temp_emergency, set_temp_emergency, 1);
static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 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,
			 const struct i2c_device_id *id)
{
	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 = 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
a5b79d62	1	/*
	2	* max6639.c - Support for Maxim MAX6639
	3	*
	4	* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
	5	*
	6	* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
	7	*
	8	* based on the initial MAX6639 support from semptian.net
	9	* by He Changqing <hechangqing@semptian.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/slab.h>
	29	#include <linux/jiffies.h>
	30	#include <linux/i2c.h>
	31	#include <linux/hwmon.h>
	32	#include <linux/hwmon-sysfs.h>
	33	#include <linux/err.h>
	34	#include <linux/mutex.h>
0c9fe161	35	#include <linux/platform_data/max6639.h>
a5b79d62	36
a5b79d62	37	/* Addresses to scan */
7edc8cc1	38	static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
a5b79d62	39
	40	/* The MAX6639 registers, valid channel numbers: 0, 1 */
	41	#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
	42	#define MAX6639_REG_STATUS 0x02
	43	#define MAX6639_REG_OUTPUT_MASK 0x03
	44	#define MAX6639_REG_GCONFIG 0x04
	45	#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
	46	#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
	47	#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
	48	#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
	49	#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
	50	#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
	51	#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
	52	#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
	53	#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
	54	#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
	55	#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
	56	#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
	57	#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
	58	#define MAX6639_REG_DEVID 0x3D
	59	#define MAX6639_REG_MANUID 0x3E
	60	#define MAX6639_REG_DEVREV 0x3F
	61
	62	/* Register bits */
	63	#define MAX6639_GCONFIG_STANDBY 0x80
	64	#define MAX6639_GCONFIG_POR 0x40
	65	#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
	66	#define MAX6639_GCONFIG_CH2_LOCAL 0x10
177f3b92	67	#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
a5b79d62	68
	69	#define MAX6639_FAN_CONFIG1_PWM 0x80
	70
177f3b92	71	#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
177f3b92	72
a5b79d62	73	static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
a5b79d62	74
b63d97a3 CS	75	#define FAN_FROM_REG(val, rpm_range) ((val) == 0 \|\| (val) == 255 ? \
b63d97a3 CS	76	0 : (rpm_ranges[rpm_range] * 30) / (val))
2a844c14	77	#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
a5b79d62	78
	79	/*
	80	* Client data (each client gets its own)
	81	*/
	82	struct max6639_data {
7981c584	83	struct i2c_client *client;
a5b79d62	84	struct mutex update_lock;
	85	char valid; /* !=0 if following fields are valid */
	86	unsigned long last_updated; /* In jiffies */
	87
	88	/* Register values sampled regularly */
	89	u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
	90	bool temp_fault[2]; /* Detected temperature diode failure */
	91	u8 fan[2]; /* Register value: TACH count for fans >=30 */
	92	u8 status; /* Detected channel alarms and fan failures */
	93
	94	/* Register values only written to */
	95	u8 pwm[2]; /* Register value: Duty cycle 0..120 */
	96	u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
	97	u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
	98	u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
	99
	100	/* Register values initialized only once */
	101	u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
	102	u8 rpm_range; /* Index in above rpm_ranges table */
	103	};
	104
	105	static struct max6639_data max6639_update_device(struct device dev)
	106	{
7981c584 GR	107	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	108	struct i2c_client *client = data->client;
a5b79d62	109	struct max6639_data *ret = data;
	110	int i;
	111	int status_reg;
	112
	113	mutex_lock(&data->update_lock);
	114
	115	if (time_after(jiffies, data->last_updated + 2 * HZ) \|\| !data->valid) {
	116	int res;
	117
	118	dev_dbg(&client->dev, "Starting max6639 update\n");
	119
	120	status_reg = i2c_smbus_read_byte_data(client,
	121	MAX6639_REG_STATUS);
	122	if (status_reg < 0) {
	123	ret = ERR_PTR(status_reg);
	124	goto abort;
	125	}
	126
	127	data->status = status_reg;
	128
	129	for (i = 0; i < 2; i++) {
	130	res = i2c_smbus_read_byte_data(client,
	131	MAX6639_REG_FAN_CNT(i));
	132	if (res < 0) {
	133	ret = ERR_PTR(res);
	134	goto abort;
	135	}
	136	data->fan[i] = res;
	137
	138	res = i2c_smbus_read_byte_data(client,
	139	MAX6639_REG_TEMP_EXT(i));
	140	if (res < 0) {
	141	ret = ERR_PTR(res);
	142	goto abort;
	143	}
	144	data->temp[i] = res >> 5;
	145	data->temp_fault[i] = res & 0x01;
	146
	147	res = i2c_smbus_read_byte_data(client,
	148	MAX6639_REG_TEMP(i));
	149	if (res < 0) {
	150	ret = ERR_PTR(res);
	151	goto abort;
	152	}
	153	data->temp[i] \|= res << 3;
	154	}
	155
	156	data->last_updated = jiffies;
	157	data->valid = 1;
	158	}
	159	abort:
	160	mutex_unlock(&data->update_lock);
	161
	162	return ret;
	163	}
	164
	165	static ssize_t show_temp_input(struct device *dev,
	166	struct device_attribute dev_attr, char buf)
	167	{
	168	long temp;
	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	temp = data->temp[attr->index] * 125;
176	return sprintf(buf, "%ld\n", temp);
177	}
178
179	static ssize_t show_temp_fault(struct device *dev,
180	struct device_attribute dev_attr, char buf)
181	{
182	struct max6639_data *data = max6639_update_device(dev);
183	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
184
185	if (IS_ERR(data))
186	return PTR_ERR(data);
187
188	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
189	}
190
191	static ssize_t show_temp_max(struct device *dev,
192	struct device_attribute dev_attr, char buf)
193	{
a5b79d62	194	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	195	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	196
	197	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
	198	}
	199
	200	static ssize_t set_temp_max(struct device *dev,
	201	struct device_attribute *dev_attr,
	202	const char *buf, size_t count)
	203	{
a5b79d62	204	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	205	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	206	struct i2c_client *client = data->client;
a5b79d62	207	unsigned long val;
	208	int res;
	209
179c4fdb	210	res = kstrtoul(buf, 10, &val);
a5b79d62	211	if (res)
	212	return res;
	213
	214	mutex_lock(&data->update_lock);
	215	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
	216	i2c_smbus_write_byte_data(client,
	217	MAX6639_REG_THERM_LIMIT(attr->index),
	218	data->temp_therm[attr->index]);
	219	mutex_unlock(&data->update_lock);
	220	return count;
	221	}
	222
	223	static ssize_t show_temp_crit(struct device *dev,
	224	struct device_attribute dev_attr, char buf)
	225	{
a5b79d62	226	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	227	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	228
	229	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
	230	}
	231
	232	static ssize_t set_temp_crit(struct device *dev,
	233	struct device_attribute *dev_attr,
	234	const char *buf, size_t count)
	235	{
a5b79d62	236	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	237	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	238	struct i2c_client *client = data->client;
a5b79d62	239	unsigned long val;
	240	int res;
	241
179c4fdb	242	res = kstrtoul(buf, 10, &val);
a5b79d62	243	if (res)
	244	return res;
	245
	246	mutex_lock(&data->update_lock);
	247	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
	248	i2c_smbus_write_byte_data(client,
	249	MAX6639_REG_ALERT_LIMIT(attr->index),
	250	data->temp_alert[attr->index]);
	251	mutex_unlock(&data->update_lock);
	252	return count;
	253	}
	254
	255	static ssize_t show_temp_emergency(struct device *dev,
	256	struct device_attribute *dev_attr,
	257	char *buf)
	258	{
a5b79d62	259	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	260	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	261
	262	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
	263	}
	264
	265	static ssize_t set_temp_emergency(struct device *dev,
	266	struct device_attribute *dev_attr,
	267	const char *buf, size_t count)
	268	{
a5b79d62	269	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	270	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	271	struct i2c_client *client = data->client;
a5b79d62	272	unsigned long val;
	273	int res;
	274
179c4fdb	275	res = kstrtoul(buf, 10, &val);
a5b79d62	276	if (res)
	277	return res;
	278
	279	mutex_lock(&data->update_lock);
	280	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
	281	i2c_smbus_write_byte_data(client,
	282	MAX6639_REG_OT_LIMIT(attr->index),
	283	data->temp_ot[attr->index]);
	284	mutex_unlock(&data->update_lock);
	285	return count;
	286	}
	287
	288	static ssize_t show_pwm(struct device *dev,
	289	struct device_attribute dev_attr, char buf)
	290	{
a5b79d62	291	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584	292	struct max6639_data *data = dev_get_drvdata(dev);
a5b79d62	293
	294	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
	295	}
	296
	297	static ssize_t set_pwm(struct device *dev,
	298	struct device_attribute *dev_attr,
	299	const char *buf, size_t count)
	300	{
a5b79d62	301	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
7981c584 GR	302	struct max6639_data *data = dev_get_drvdata(dev);
7981c584 GR	303	struct i2c_client *client = data->client;
a5b79d62	304	unsigned long val;
	305	int res;
	306
179c4fdb	307	res = kstrtoul(buf, 10, &val);
a5b79d62	308	if (res)
	309	return res;
	310
2a844c14	311	val = clamp_val(val, 0, 255);
a5b79d62	312
	313	mutex_lock(&data->update_lock);
	314	data->pwm[attr->index] = (u8)(val * 120 / 255);
	315	i2c_smbus_write_byte_data(client,
	316	MAX6639_REG_TARGTDUTY(attr->index),
	317	data->pwm[attr->index]);
	318	mutex_unlock(&data->update_lock);
	319	return count;
	320	}
	321
	322	static ssize_t show_fan_input(struct device *dev,
	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", FAN_FROM_REG(data->fan[attr->index],
b63d97a3	332	data->rpm_range));
a5b79d62	333	}
	334
	335	static ssize_t show_alarm(struct device *dev,
	336	struct device_attribute dev_attr, char buf)
	337	{
	338	struct max6639_data *data = max6639_update_device(dev);
	339	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	340
	341	if (IS_ERR(data))
	342	return PTR_ERR(data);
	343
	344	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
	345	}
	346
	347	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
	348	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
	349	static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
	350	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
	351	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
	352	set_temp_max, 0);
	353	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
	354	set_temp_max, 1);
	355	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO, show_temp_crit,
	356	set_temp_crit, 0);
	357	static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit,
	358	set_temp_crit, 1);
	359	static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR \| S_IRUGO,
	360	show_temp_emergency, set_temp_emergency, 0);
	361	static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR \| S_IRUGO,
	362	show_temp_emergency, set_temp_emergency, 1);
	363	static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR \| S_IRUGO, show_pwm, set_pwm, 0);
	364	static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR \| S_IRUGO, show_pwm, set_pwm, 1);
	365	static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
	366	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
	367	static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
	368	static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
	369	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
	370	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
	371	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
	372	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
	373	static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
	374	static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4);
	375
	376
7981c584	377	static struct attribute *max6639_attrs[] = {
a5b79d62	378	&sensor_dev_attr_temp1_input.dev_attr.attr,
	379	&sensor_dev_attr_temp2_input.dev_attr.attr,
	380	&sensor_dev_attr_temp1_fault.dev_attr.attr,
	381	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	382	&sensor_dev_attr_temp1_max.dev_attr.attr,
	383	&sensor_dev_attr_temp2_max.dev_attr.attr,
	384	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	385	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	386	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
	387	&sensor_dev_attr_temp2_emergency.dev_attr.attr,
	388	&sensor_dev_attr_pwm1.dev_attr.attr,
	389	&sensor_dev_attr_pwm2.dev_attr.attr,
	390	&sensor_dev_attr_fan1_input.dev_attr.attr,
	391	&sensor_dev_attr_fan2_input.dev_attr.attr,
	392	&sensor_dev_attr_fan1_fault.dev_attr.attr,
	393	&sensor_dev_attr_fan2_fault.dev_attr.attr,
	394	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	395	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	396	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	397	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	398	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
	399	&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
	400	NULL
	401	};
7981c584	402	ATTRIBUTE_GROUPS(max6639);
a5b79d62	403
	404	/*
	405	* returns respective index in rpm_ranges table
	406	* 1 by default on invalid range
	407	*/
	408	static int rpm_range_to_reg(int range)
	409	{
	410	int i;
	411
	412	for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
	413	if (rpm_ranges[i] == range)
	414	return i;
	415	}
	416
	417	return 1; /* default: 4000 RPM */
	418	}
	419
7981c584 GR	420	static int max6639_init_client(struct i2c_client *client,
7981c584 GR	421	struct max6639_data *data)
a5b79d62	422	{
a5b79d62	423	struct max6639_platform_data *max6639_info =
a8b3a3a5	424	dev_get_platdata(&client->dev);
2f2da1ac	425	int i;
a5b79d62	426	int rpm_range = 1; /* default: 4000 RPM */
2f2da1ac	427	int err;
a5b79d62	428
177f3b92	429	/* Reset chip to default values, see below for GCONFIG setup */
a5b79d62	430	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
	431	MAX6639_GCONFIG_POR);
	432	if (err)
	433	goto exit;
	434
	435	/* Fans pulse per revolution is 2 by default */
	436	if (max6639_info && max6639_info->ppr > 0 &&
	437	max6639_info->ppr < 5)
	438	data->ppr = max6639_info->ppr;
	439	else
	440	data->ppr = 2;
	441	data->ppr -= 1;
a5b79d62	442
	443	if (max6639_info)
	444	rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
	445	data->rpm_range = rpm_range;
	446
	447	for (i = 0; i < 2; i++) {
	448
2f2da1ac CS	449	/* Set Fan pulse per revolution */
	450	err = i2c_smbus_write_byte_data(client,
	451	MAX6639_REG_FAN_PPR(i),
	452	data->ppr << 6);
	453	if (err)
	454	goto exit;
	455
a5b79d62	456	/* Fans config PWM, RPM */
	457	err = i2c_smbus_write_byte_data(client,
	458	MAX6639_REG_FAN_CONFIG1(i),
	459	MAX6639_FAN_CONFIG1_PWM \| rpm_range);
	460	if (err)
	461	goto exit;
	462
	463	/* Fans PWM polarity high by default */
	464	if (max6639_info && max6639_info->pwm_polarity == 0)
	465	err = i2c_smbus_write_byte_data(client,
	466	MAX6639_REG_FAN_CONFIG2a(i), 0x00);
	467	else
	468	err = i2c_smbus_write_byte_data(client,
	469	MAX6639_REG_FAN_CONFIG2a(i), 0x02);
	470	if (err)
	471	goto exit;
	472
177f3b92	473	/*
	474	* /THERM full speed enable,
	475	* PWM frequency 25kHz, see also GCONFIG below
	476	*/
	477	err = i2c_smbus_write_byte_data(client,
	478	MAX6639_REG_FAN_CONFIG3(i),
	479	MAX6639_FAN_CONFIG3_THERM_FULL_SPEED \| 0x03);
	480	if (err)
	481	goto exit;
	482
a5b79d62	483	/* Max. temp. 80C/90C/100C */
	484	data->temp_therm[i] = 80;
	485	data->temp_alert[i] = 90;
	486	data->temp_ot[i] = 100;
	487	err = i2c_smbus_write_byte_data(client,
	488	MAX6639_REG_THERM_LIMIT(i),
	489	data->temp_therm[i]);
	490	if (err)
	491	goto exit;
	492	err = i2c_smbus_write_byte_data(client,
	493	MAX6639_REG_ALERT_LIMIT(i),
	494	data->temp_alert[i]);
	495	if (err)
	496	goto exit;
	497	err = i2c_smbus_write_byte_data(client,
	498	MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
	499	if (err)
	500	goto exit;
	501
	502	/* PWM 120/120 (i.e. 100%) */
	503	data->pwm[i] = 120;
	504	err = i2c_smbus_write_byte_data(client,
	505	MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
	506	if (err)
	507	goto exit;
	508	}
	509	/* Start monitoring */
	510	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
177f3b92	511	MAX6639_GCONFIG_DISABLE_TIMEOUT \| MAX6639_GCONFIG_CH2_LOCAL \|
177f3b92	512	MAX6639_GCONFIG_PWM_FREQ_HI);
a5b79d62	513	exit:
	514	return err;
	515	}
	516
	517	/* Return 0 if detection is successful, -ENODEV otherwise */
	518	static int max6639_detect(struct i2c_client *client,
	519	struct i2c_board_info *info)
	520	{
	521	struct i2c_adapter *adapter = client->adapter;
	522	int dev_id, manu_id;
	523
	524	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	525	return -ENODEV;
	526
	527	/* Actual detection via device and manufacturer ID */
	528	dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
	529	manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
	530	if (dev_id != 0x58 \|\| manu_id != 0x4D)
	531	return -ENODEV;
	532
	533	strlcpy(info->type, "max6639", I2C_NAME_SIZE);
	534
	535	return 0;
	536	}
	537
	538	static int max6639_probe(struct i2c_client *client,
	539	const struct i2c_device_id *id)
	540	{
c1ea0a04	541	struct device *dev = &client->dev;
a5b79d62	542	struct max6639_data *data;
7981c584	543	struct device *hwmon_dev;
a5b79d62	544	int err;
a5b79d62	545
c1ea0a04	546	data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
b07405fb GR	547	if (!data)
b07405fb GR	548	return -ENOMEM;
a5b79d62	549
7981c584	550	data->client = client;
a5b79d62	551	mutex_init(&data->update_lock);
	552
	553	/* Initialize the max6639 chip */
7981c584	554	err = max6639_init_client(client, data);
a5b79d62	555	if (err < 0)
b07405fb	556	return err;
a5b79d62	557
7981c584 GR	558	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	559	data,
	560	max6639_groups);
	561	return PTR_ERR_OR_ZERO(hwmon_dev);
a5b79d62	562	}
a5b79d62	563
52f30f77 MB	564	#ifdef CONFIG_PM_SLEEP
52f30f77 MB	565	static int max6639_suspend(struct device *dev)
a5b79d62	566	{
52f30f77	567	struct i2c_client *client = to_i2c_client(dev);
a5b79d62	568	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	569	if (data < 0)
	570	return data;
	571
	572	return i2c_smbus_write_byte_data(client,
	573	MAX6639_REG_GCONFIG, data \| MAX6639_GCONFIG_STANDBY);
	574	}
	575
52f30f77	576	static int max6639_resume(struct device *dev)
a5b79d62	577	{
52f30f77	578	struct i2c_client *client = to_i2c_client(dev);
a5b79d62	579	int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
	580	if (data < 0)
	581	return data;
	582
	583	return i2c_smbus_write_byte_data(client,
	584	MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
	585	}
52f30f77	586	#endif /* CONFIG_PM_SLEEP */
a5b79d62	587
	588	static const struct i2c_device_id max6639_id[] = {
	589	{"max6639", 0},
	590	{ }
	591	};
	592
	593	MODULE_DEVICE_TABLE(i2c, max6639_id);
	594
768821a3	595	static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
52f30f77	596
a5b79d62	597	static struct i2c_driver max6639_driver = {
	598	.class = I2C_CLASS_HWMON,
	599	.driver = {
	600	.name = "max6639",
52f30f77	601	.pm = &max6639_pm_ops,
a5b79d62	602	},
a5b79d62	603	.probe = max6639_probe,
a5b79d62	604	.id_table = max6639_id,
	605	.detect = max6639_detect,
	606	.address_list = normal_i2c,
	607	};
	608
f0967eea	609	module_i2c_driver(max6639_driver);
a5b79d62	610
	611	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	612	MODULE_DESCRIPTION("max6639 driver");
	613	MODULE_LICENSE("GPL");