[linux-2.6-block.git] / drivers / hwmon / emc6w201.c

/*
 * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
 * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
 *
 * 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>

/*
 * Addresses to scan
 */

static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

/*
 * The EMC6W201 registers
 */

#define EMC6W201_REG_IN(nr)		(0x20 + (nr))
#define EMC6W201_REG_TEMP(nr)		(0x26 + (nr))
#define EMC6W201_REG_FAN(nr)		(0x2C + (nr) * 2)
#define EMC6W201_REG_COMPANY		0x3E
#define EMC6W201_REG_VERSTEP		0x3F
#define EMC6W201_REG_CONFIG		0x40
#define EMC6W201_REG_IN_LOW(nr)		(0x4A + (nr) * 2)
#define EMC6W201_REG_IN_HIGH(nr)	(0x4B + (nr) * 2)
#define EMC6W201_REG_TEMP_LOW(nr)	(0x56 + (nr) * 2)
#define EMC6W201_REG_TEMP_HIGH(nr)	(0x57 + (nr) * 2)
#define EMC6W201_REG_FAN_MIN(nr)	(0x62 + (nr) * 2)

enum subfeature { input, min, max };

/*
 * Per-device data
 */

struct emc6w201_data {
	struct i2c_client *client;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u8 in[3][6];
	s8 temp[3][6];
	u16 fan[2][5];
};

/*
 * Combine LSB and MSB registers in a single value
 * Locking: must be called with data->update_lock held
 */
static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
{
	int lsb, msb;

	lsb = i2c_smbus_read_byte_data(client, reg);
	msb = i2c_smbus_read_byte_data(client, reg + 1);
	if (unlikely(lsb < 0 || msb < 0)) {
		dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
			16, "read", reg);
		return 0xFFFF;	/* Arbitrary value */
	}

	return (msb << 8) | lsb;
}

/*
 * Write 16-bit value to LSB and MSB registers
 * Locking: must be called with data->update_lock held
 */
static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
{
	int err;

	err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
	if (likely(!err))
		err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
	if (unlikely(err < 0))
		dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
			16, "write", reg);

	return err;
}

/* Read 8-bit value from register */
static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
{
	int val;

	val = i2c_smbus_read_byte_data(client, reg);
	if (unlikely(val < 0)) {
		dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
			8, "read", reg);
		return 0x00;	/* Arbitrary value */
	}

	return val;
}

/* Write 8-bit value to register */
static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
{
	int err;

	err = i2c_smbus_write_byte_data(client, reg, val);
	if (unlikely(err < 0))
		dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
			8, "write", reg);

	return err;
}

static struct emc6w201_data *emc6w201_update_device(struct device *dev)
{
	struct emc6w201_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int nr;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		for (nr = 0; nr < 6; nr++) {
			data->in[input][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_IN(nr));
			data->in[min][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_IN_LOW(nr));
			data->in[max][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_IN_HIGH(nr));
		}

		for (nr = 0; nr < 6; nr++) {
			data->temp[input][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_TEMP(nr));
			data->temp[min][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_TEMP_LOW(nr));
			data->temp[max][nr] =
				emc6w201_read8(client,
						EMC6W201_REG_TEMP_HIGH(nr));
		}

		for (nr = 0; nr < 5; nr++) {
			data->fan[input][nr] =
				emc6w201_read16(client,
						EMC6W201_REG_FAN(nr));
			data->fan[min][nr] =
				emc6w201_read16(client,
						EMC6W201_REG_FAN_MIN(nr));
		}

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs callback functions
 */

static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };

static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
		       char *buf)
{
	struct emc6w201_data *data = emc6w201_update_device(dev);
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;

	return sprintf(buf, "%u\n",
		       (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
}

static ssize_t in_store(struct device *dev, struct device_attribute *devattr,
			const char *buf, size_t count)
{
	struct emc6w201_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;
	int err;
	long val;
	u8 reg;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
	val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
	reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
			  : EMC6W201_REG_IN_HIGH(nr);

	mutex_lock(&data->update_lock);
	data->in[sf][nr] = val;
	err = emc6w201_write8(client, reg, data->in[sf][nr]);
	mutex_unlock(&data->update_lock);

	return err < 0 ? err : count;
}

static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	struct emc6w201_data *data = emc6w201_update_device(dev);
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;

	return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
}

static ssize_t temp_store(struct device *dev,
			  struct device_attribute *devattr, const char *buf,
			  size_t count)
{
	struct emc6w201_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;
	int err;
	long val;
	u8 reg;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(val, -127000, 127000);
	val = DIV_ROUND_CLOSEST(val, 1000);
	reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
			  : EMC6W201_REG_TEMP_HIGH(nr);

	mutex_lock(&data->update_lock);
	data->temp[sf][nr] = val;
	err = emc6w201_write8(client, reg, data->temp[sf][nr]);
	mutex_unlock(&data->update_lock);

	return err < 0 ? err : count;
}

static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	struct emc6w201_data *data = emc6w201_update_device(dev);
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;
	unsigned rpm;

	if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
		rpm = 0;
	else
		rpm = 5400000U / data->fan[sf][nr];

	return sprintf(buf, "%u\n", rpm);
}

static ssize_t fan_store(struct device *dev, struct device_attribute *devattr,
			 const char *buf, size_t count)
{
	struct emc6w201_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int sf = to_sensor_dev_attr_2(devattr)->index;
	int nr = to_sensor_dev_attr_2(devattr)->nr;
	int err;
	unsigned long val;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	if (val == 0) {
		val = 0xFFFF;
	} else {
		val = DIV_ROUND_CLOSEST(5400000U, val);
		val = clamp_val(val, 0, 0xFFFE);
	}

	mutex_lock(&data->update_lock);
	data->fan[sf][nr] = val;
	err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
			       data->fan[sf][nr]);
	mutex_unlock(&data->update_lock);

	return err < 0 ? err : count;
}

static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);

static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);

static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);

static struct attribute *emc6w201_attrs[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_temp4_min.dev_attr.attr,
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp5_input.dev_attr.attr,
	&sensor_dev_attr_temp5_min.dev_attr.attr,
	&sensor_dev_attr_temp5_max.dev_attr.attr,
	&sensor_dev_attr_temp6_input.dev_attr.attr,
	&sensor_dev_attr_temp6_min.dev_attr.attr,
	&sensor_dev_attr_temp6_max.dev_attr.attr,

	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan3_min.dev_attr.attr,
	&sensor_dev_attr_fan4_input.dev_attr.attr,
	&sensor_dev_attr_fan4_min.dev_attr.attr,
	&sensor_dev_attr_fan5_input.dev_attr.attr,
	&sensor_dev_attr_fan5_min.dev_attr.attr,
	NULL
};

ATTRIBUTE_GROUPS(emc6w201);

/*
 * Driver interface
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int emc6w201_detect(struct i2c_client *client,
			   struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	int company, verstep, config;

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

	/* Identification */
	company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
	if (company != 0x5C)
		return -ENODEV;
	verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
	if (verstep < 0 || (verstep & 0xF0) != 0xB0)
		return -ENODEV;
	if ((verstep & 0x0F) > 2) {
		dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
			verstep & 0x0F);
		return -ENODEV;
	}

	/* Check configuration */
	config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
	if (config < 0 || (config & 0xF4) != 0x04)
		return -ENODEV;
	if (!(config & 0x01)) {
		dev_err(&client->dev, "Monitoring not enabled\n");
		return -ENODEV;
	}

	strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);

	return 0;
}

static int emc6w201_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct emc6w201_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data,
							   emc6w201_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id emc6w201_id[] = {
	{ "emc6w201", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, emc6w201_id);

static struct i2c_driver emc6w201_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "emc6w201",
	},
	.probe		= emc6w201_probe,
	.id_table	= emc6w201_id,
	.detect		= emc6w201_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(emc6w201_driver);

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b0b349a8 JD	1	/*
b0b349a8 JD	2	* emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
7c81c60f	3	* Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
b0b349a8 JD	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19
	20	#include <linux/module.h>
b0b349a8 JD	21	#include <linux/init.h>
	22	#include <linux/slab.h>
	23	#include <linux/jiffies.h>
	24	#include <linux/i2c.h>
	25	#include <linux/hwmon.h>
	26	#include <linux/hwmon-sysfs.h>
	27	#include <linux/err.h>
	28	#include <linux/mutex.h>
	29
	30	/*
	31	* Addresses to scan
	32	*/
	33
	34	static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
	35
	36	/*
	37	* The EMC6W201 registers
	38	*/
	39
	40	#define EMC6W201_REG_IN(nr) (0x20 + (nr))
	41	#define EMC6W201_REG_TEMP(nr) (0x26 + (nr))
	42	#define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2)
	43	#define EMC6W201_REG_COMPANY 0x3E
	44	#define EMC6W201_REG_VERSTEP 0x3F
	45	#define EMC6W201_REG_CONFIG 0x40
	46	#define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2)
	47	#define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2)
	48	#define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2)
	49	#define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2)
	50	#define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2)
	51
94e44413	52	enum subfeature { input, min, max };
b0b349a8 JD	53
	54	/*
	55	* Per-device data
	56	*/
	57
	58	struct emc6w201_data {
7b3dadc4	59	struct i2c_client *client;
b0b349a8 JD	60	struct mutex update_lock;
	61	char valid; /* zero until following fields are valid */
	62	unsigned long last_updated; /* in jiffies */
	63
	64	/* registers values */
	65	u8 in[3][6];
	66	s8 temp[3][6];
	67	u16 fan[2][5];
	68	};
	69
	70	/*
	71	* Combine LSB and MSB registers in a single value
	72	* Locking: must be called with data->update_lock held
	73	*/
	74	static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
	75	{
	76	int lsb, msb;
	77
	78	lsb = i2c_smbus_read_byte_data(client, reg);
	79	msb = i2c_smbus_read_byte_data(client, reg + 1);
b6b2a1e8 JD	80	if (unlikely(lsb < 0 \|\| msb < 0)) {
	81	dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
	82	16, "read", reg);
b0b349a8 JD	83	return 0xFFFF; /* Arbitrary value */
	84	}
	85
	86	return (msb << 8) \| lsb;
	87	}
	88
	89	/*
	90	* Write 16-bit value to LSB and MSB registers
	91	* Locking: must be called with data->update_lock held
	92	*/
	93	static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
	94	{
	95	int err;
	96
	97	err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
b6b2a1e8	98	if (likely(!err))
b0b349a8	99	err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
b6b2a1e8 JD	100	if (unlikely(err < 0))
	101	dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
	102	16, "write", reg);
	103
	104	return err;
	105	}
	106
	107	/* Read 8-bit value from register */
	108	static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
	109	{
	110	int val;
	111
	112	val = i2c_smbus_read_byte_data(client, reg);
	113	if (unlikely(val < 0)) {
	114	dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
	115	8, "read", reg);
	116	return 0x00; /* Arbitrary value */
	117	}
	118
	119	return val;
	120	}
	121
	122	/* Write 8-bit value to register */
	123	static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
	124	{
	125	int err;
	126
	127	err = i2c_smbus_write_byte_data(client, reg, val);
	128	if (unlikely(err < 0))
	129	dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
	130	8, "write", reg);
b0b349a8 JD	131
	132	return err;
	133	}
	134
	135	static struct emc6w201_data emc6w201_update_device(struct device dev)
	136	{
7b3dadc4 AL	137	struct emc6w201_data *data = dev_get_drvdata(dev);
7b3dadc4 AL	138	struct i2c_client *client = data->client;
b0b349a8 JD	139	int nr;
	140
	141	mutex_lock(&data->update_lock);
	142
	143	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
	144	for (nr = 0; nr < 6; nr++) {
	145	data->in[input][nr] =
b6b2a1e8	146	emc6w201_read8(client,
b0b349a8 JD	147	EMC6W201_REG_IN(nr));
b0b349a8 JD	148	data->in[min][nr] =
b6b2a1e8	149	emc6w201_read8(client,
b0b349a8 JD	150	EMC6W201_REG_IN_LOW(nr));
b0b349a8 JD	151	data->in[max][nr] =
b6b2a1e8	152	emc6w201_read8(client,
b0b349a8 JD	153	EMC6W201_REG_IN_HIGH(nr));
	154	}
	155
	156	for (nr = 0; nr < 6; nr++) {
	157	data->temp[input][nr] =
b6b2a1e8	158	emc6w201_read8(client,
b0b349a8 JD	159	EMC6W201_REG_TEMP(nr));
b0b349a8 JD	160	data->temp[min][nr] =
b6b2a1e8	161	emc6w201_read8(client,
b0b349a8 JD	162	EMC6W201_REG_TEMP_LOW(nr));
b0b349a8 JD	163	data->temp[max][nr] =
b6b2a1e8	164	emc6w201_read8(client,
b0b349a8 JD	165	EMC6W201_REG_TEMP_HIGH(nr));
	166	}
	167
	168	for (nr = 0; nr < 5; nr++) {
	169	data->fan[input][nr] =
	170	emc6w201_read16(client,
	171	EMC6W201_REG_FAN(nr));
	172	data->fan[min][nr] =
	173	emc6w201_read16(client,
	174	EMC6W201_REG_FAN_MIN(nr));
	175	}
	176
	177	data->last_updated = jiffies;
	178	data->valid = 1;
	179	}
	180
	181	mutex_unlock(&data->update_lock);
	182
	183	return data;
	184	}
	185
	186	/*
	187	* Sysfs callback functions
	188	*/
	189
86266ca0	190	static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
b0b349a8	191
7a61d719 GR	192	static ssize_t in_show(struct device dev, struct device_attribute devattr,
7a61d719 GR	193	char *buf)
b0b349a8 JD	194	{
	195	struct emc6w201_data *data = emc6w201_update_device(dev);
	196	int sf = to_sensor_dev_attr_2(devattr)->index;
	197	int nr = to_sensor_dev_attr_2(devattr)->nr;
	198
	199	return sprintf(buf, "%u\n",
	200	(unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
	201	}
	202
7a61d719 GR	203	static ssize_t in_store(struct device dev, struct device_attribute devattr,
7a61d719 GR	204	const char *buf, size_t count)
b0b349a8	205	{
7b3dadc4 AL	206	struct emc6w201_data *data = dev_get_drvdata(dev);
7b3dadc4 AL	207	struct i2c_client *client = data->client;
b0b349a8 JD	208	int sf = to_sensor_dev_attr_2(devattr)->index;
	209	int nr = to_sensor_dev_attr_2(devattr)->nr;
	210	int err;
	211	long val;
	212	u8 reg;
	213
179c4fdb	214	err = kstrtol(buf, 10, &val);
b0b349a8 JD	215	if (err < 0)
	216	return err;
	217
59715f4d GR	218	val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
59715f4d GR	219	val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
b0b349a8 JD	220	reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
	221	: EMC6W201_REG_IN_HIGH(nr);
	222
	223	mutex_lock(&data->update_lock);
59715f4d	224	data->in[sf][nr] = val;
b6b2a1e8	225	err = emc6w201_write8(client, reg, data->in[sf][nr]);
b0b349a8 JD	226	mutex_unlock(&data->update_lock);
	227
	228	return err < 0 ? err : count;
	229	}
	230
7a61d719 GR	231	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
7a61d719 GR	232	char *buf)
b0b349a8 JD	233	{
	234	struct emc6w201_data *data = emc6w201_update_device(dev);
	235	int sf = to_sensor_dev_attr_2(devattr)->index;
	236	int nr = to_sensor_dev_attr_2(devattr)->nr;
	237
	238	return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
	239	}
	240
7a61d719 GR	241	static ssize_t temp_store(struct device *dev,
	242	struct device_attribute devattr, const char buf,
	243	size_t count)
b0b349a8	244	{
7b3dadc4 AL	245	struct emc6w201_data *data = dev_get_drvdata(dev);
7b3dadc4 AL	246	struct i2c_client *client = data->client;
b0b349a8 JD	247	int sf = to_sensor_dev_attr_2(devattr)->index;
	248	int nr = to_sensor_dev_attr_2(devattr)->nr;
	249	int err;
	250	long val;
	251	u8 reg;
	252
179c4fdb	253	err = kstrtol(buf, 10, &val);
b0b349a8 JD	254	if (err < 0)
	255	return err;
	256
59715f4d	257	val = clamp_val(val, -127000, 127000);
539a719f	258	val = DIV_ROUND_CLOSEST(val, 1000);
b0b349a8 JD	259	reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
	260	: EMC6W201_REG_TEMP_HIGH(nr);
	261
	262	mutex_lock(&data->update_lock);
59715f4d	263	data->temp[sf][nr] = val;
b6b2a1e8	264	err = emc6w201_write8(client, reg, data->temp[sf][nr]);
b0b349a8 JD	265	mutex_unlock(&data->update_lock);
	266
	267	return err < 0 ? err : count;
	268	}
	269
7a61d719 GR	270	static ssize_t fan_show(struct device dev, struct device_attribute devattr,
7a61d719 GR	271	char *buf)
b0b349a8 JD	272	{
	273	struct emc6w201_data *data = emc6w201_update_device(dev);
	274	int sf = to_sensor_dev_attr_2(devattr)->index;
	275	int nr = to_sensor_dev_attr_2(devattr)->nr;
	276	unsigned rpm;
	277
	278	if (data->fan[sf][nr] == 0 \|\| data->fan[sf][nr] == 0xFFFF)
	279	rpm = 0;
	280	else
	281	rpm = 5400000U / data->fan[sf][nr];
	282
	283	return sprintf(buf, "%u\n", rpm);
	284	}
	285
7a61d719 GR	286	static ssize_t fan_store(struct device dev, struct device_attribute devattr,
7a61d719 GR	287	const char *buf, size_t count)
b0b349a8	288	{
7b3dadc4 AL	289	struct emc6w201_data *data = dev_get_drvdata(dev);
7b3dadc4 AL	290	struct i2c_client *client = data->client;
b0b349a8 JD	291	int sf = to_sensor_dev_attr_2(devattr)->index;
	292	int nr = to_sensor_dev_attr_2(devattr)->nr;
	293	int err;
	294	unsigned long val;
	295
179c4fdb	296	err = kstrtoul(buf, 10, &val);
b0b349a8 JD	297	if (err < 0)
	298	return err;
	299
	300	if (val == 0) {
	301	val = 0xFFFF;
	302	} else {
	303	val = DIV_ROUND_CLOSEST(5400000U, val);
2a844c14	304	val = clamp_val(val, 0, 0xFFFE);
b0b349a8 JD	305	}
	306
	307	mutex_lock(&data->update_lock);
	308	data->fan[sf][nr] = val;
	309	err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
	310	data->fan[sf][nr]);
	311	mutex_unlock(&data->update_lock);
	312
	313	return err < 0 ? err : count;
	314	}
	315
7a61d719 GR	316	static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
	317	static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
	318	static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
	319	static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
	320	static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
	321	static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
	322	static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
	323	static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
	324	static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
	325	static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
	326	static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
	327	static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
	328	static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
	329	static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
	330	static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
	331	static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
	332	static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
	333	static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);
	334
	335	static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
	336	static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
	337	static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
	338	static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
	339	static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
	340	static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
	341	static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
	342	static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
	343	static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
	344	static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
	345	static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
	346	static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
	347	static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
	348	static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
	349	static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
	350	static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
	351	static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
	352	static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);
	353
	354	static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
	355	static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
	356	static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
	357	static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
	358	static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
	359	static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
	360	static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
	361	static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
	362	static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
	363	static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);
b0b349a8	364
7b3dadc4	365	static struct attribute *emc6w201_attrs[] = {
b0b349a8 JD	366	&sensor_dev_attr_in0_input.dev_attr.attr,
	367	&sensor_dev_attr_in0_min.dev_attr.attr,
	368	&sensor_dev_attr_in0_max.dev_attr.attr,
	369	&sensor_dev_attr_in1_input.dev_attr.attr,
	370	&sensor_dev_attr_in1_min.dev_attr.attr,
	371	&sensor_dev_attr_in1_max.dev_attr.attr,
	372	&sensor_dev_attr_in2_input.dev_attr.attr,
	373	&sensor_dev_attr_in2_min.dev_attr.attr,
	374	&sensor_dev_attr_in2_max.dev_attr.attr,
	375	&sensor_dev_attr_in3_input.dev_attr.attr,
	376	&sensor_dev_attr_in3_min.dev_attr.attr,
	377	&sensor_dev_attr_in3_max.dev_attr.attr,
	378	&sensor_dev_attr_in4_input.dev_attr.attr,
	379	&sensor_dev_attr_in4_min.dev_attr.attr,
	380	&sensor_dev_attr_in4_max.dev_attr.attr,
	381	&sensor_dev_attr_in5_input.dev_attr.attr,
	382	&sensor_dev_attr_in5_min.dev_attr.attr,
	383	&sensor_dev_attr_in5_max.dev_attr.attr,
	384
	385	&sensor_dev_attr_temp1_input.dev_attr.attr,
	386	&sensor_dev_attr_temp1_min.dev_attr.attr,
	387	&sensor_dev_attr_temp1_max.dev_attr.attr,
	388	&sensor_dev_attr_temp2_input.dev_attr.attr,
	389	&sensor_dev_attr_temp2_min.dev_attr.attr,
	390	&sensor_dev_attr_temp2_max.dev_attr.attr,
	391	&sensor_dev_attr_temp3_input.dev_attr.attr,
	392	&sensor_dev_attr_temp3_min.dev_attr.attr,
	393	&sensor_dev_attr_temp3_max.dev_attr.attr,
	394	&sensor_dev_attr_temp4_input.dev_attr.attr,
	395	&sensor_dev_attr_temp4_min.dev_attr.attr,
	396	&sensor_dev_attr_temp4_max.dev_attr.attr,
	397	&sensor_dev_attr_temp5_input.dev_attr.attr,
	398	&sensor_dev_attr_temp5_min.dev_attr.attr,
	399	&sensor_dev_attr_temp5_max.dev_attr.attr,
	400	&sensor_dev_attr_temp6_input.dev_attr.attr,
	401	&sensor_dev_attr_temp6_min.dev_attr.attr,
	402	&sensor_dev_attr_temp6_max.dev_attr.attr,
	403
	404	&sensor_dev_attr_fan1_input.dev_attr.attr,
	405	&sensor_dev_attr_fan1_min.dev_attr.attr,
	406	&sensor_dev_attr_fan2_input.dev_attr.attr,
	407	&sensor_dev_attr_fan2_min.dev_attr.attr,
	408	&sensor_dev_attr_fan3_input.dev_attr.attr,
	409	&sensor_dev_attr_fan3_min.dev_attr.attr,
	410	&sensor_dev_attr_fan4_input.dev_attr.attr,
	411	&sensor_dev_attr_fan4_min.dev_attr.attr,
	412	&sensor_dev_attr_fan5_input.dev_attr.attr,
	413	&sensor_dev_attr_fan5_min.dev_attr.attr,
	414	NULL
	415	};
	416
7b3dadc4	417	ATTRIBUTE_GROUPS(emc6w201);
b0b349a8 JD	418
	419	/*
	420	* Driver interface
	421	*/
	422
	423	/* Return 0 if detection is successful, -ENODEV otherwise */
	424	static int emc6w201_detect(struct i2c_client *client,
	425	struct i2c_board_info *info)
	426	{
	427	struct i2c_adapter *adapter = client->adapter;
	428	int company, verstep, config;
	429
	430	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	431	return -ENODEV;
	432
	433	/* Identification */
	434	company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
	435	if (company != 0x5C)
	436	return -ENODEV;
	437	verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
	438	if (verstep < 0 \|\| (verstep & 0xF0) != 0xB0)
	439	return -ENODEV;
	440	if ((verstep & 0x0F) > 2) {
51b8c2cd	441	dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
b0b349a8 JD	442	verstep & 0x0F);
	443	return -ENODEV;
	444	}
	445
	446	/* Check configuration */
	447	config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
b6b2a1e8	448	if (config < 0 \|\| (config & 0xF4) != 0x04)
b0b349a8 JD	449	return -ENODEV;
	450	if (!(config & 0x01)) {
	451	dev_err(&client->dev, "Monitoring not enabled\n");
	452	return -ENODEV;
	453	}
	454
	455	strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
	456
	457	return 0;
	458	}
	459
	460	static int emc6w201_probe(struct i2c_client *client,
	461	const struct i2c_device_id *id)
	462	{
7b3dadc4	463	struct device *dev = &client->dev;
b0b349a8	464	struct emc6w201_data *data;
7b3dadc4	465	struct device *hwmon_dev;
b0b349a8	466
7b3dadc4	467	data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
6ecffe16 GR	468	if (!data)
6ecffe16 GR	469	return -ENOMEM;
b0b349a8	470
7b3dadc4	471	data->client = client;
b0b349a8 JD	472	mutex_init(&data->update_lock);
b0b349a8 JD	473
7b3dadc4 AL	474	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	475	data,
	476	emc6w201_groups);
	477	return PTR_ERR_OR_ZERO(hwmon_dev);
b0b349a8 JD	478	}
	479
	480	static const struct i2c_device_id emc6w201_id[] = {
	481	{ "emc6w201", 0 },
	482	{ }
	483	};
	484	MODULE_DEVICE_TABLE(i2c, emc6w201_id);
	485
	486	static struct i2c_driver emc6w201_driver = {
	487	.class = I2C_CLASS_HWMON,
	488	.driver = {
	489	.name = "emc6w201",
	490	},
	491	.probe = emc6w201_probe,
b0b349a8 JD	492	.id_table = emc6w201_id,
	493	.detect = emc6w201_detect,
	494	.address_list = normal_i2c,
	495	};
	496
f0967eea	497	module_i2c_driver(emc6w201_driver);
b0b349a8	498
7c81c60f	499	MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
b0b349a8 JD	500	MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
b0b349a8 JD	501	MODULE_LICENSE("GPL");