[mirror_ubuntu-hirsute-kernel.git] / drivers / hwmon / adt7411.c

/*
 *  Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
 *
 *  Copyright (C) 2008, 2010 Pengutronix
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  TODO: SPI, use power-down mode for suspend?, interrupt handling?
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/slab.h>

#define ADT7411_REG_INT_TEMP_VDD_LSB		0x03
#define ADT7411_REG_EXT_TEMP_AIN14_LSB		0x04
#define ADT7411_REG_VDD_MSB			0x06
#define ADT7411_REG_INT_TEMP_MSB		0x07
#define ADT7411_REG_EXT_TEMP_AIN1_MSB		0x08

#define ADT7411_REG_CFG1			0x18
#define ADT7411_CFG1_START_MONITOR		(1 << 0)
#define ADT7411_CFG1_RESERVED_BIT1		(1 << 1)
#define ADT7411_CFG1_EXT_TDM			(1 << 2)
#define ADT7411_CFG1_RESERVED_BIT3		(1 << 3)

#define ADT7411_REG_CFG2			0x19
#define ADT7411_CFG2_DISABLE_AVG		(1 << 5)

#define ADT7411_REG_CFG3			0x1a
#define ADT7411_CFG3_ADC_CLK_225		(1 << 0)
#define ADT7411_CFG3_RESERVED_BIT1		(1 << 1)
#define ADT7411_CFG3_RESERVED_BIT2		(1 << 2)
#define ADT7411_CFG3_RESERVED_BIT3		(1 << 3)
#define ADT7411_CFG3_REF_VDD			(1 << 4)

#define ADT7411_REG_DEVICE_ID			0x4d
#define ADT7411_REG_MANUFACTURER_ID		0x4e

#define ADT7411_DEVICE_ID			0x2
#define ADT7411_MANUFACTURER_ID			0x41

static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };

struct adt7411_data {
	struct mutex device_lock;	/* for "atomic" device accesses */
	struct mutex update_lock;
	unsigned long next_update;
	long vref_cached;
	struct i2c_client *client;
	bool use_ext_temp;
};

/*
 * When reading a register containing (up to 4) lsb, all associated
 * msb-registers get locked by the hardware. After _one_ of those msb is read,
 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
 * is protected here with a mutex, too.
 */
static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
				u8 msb_reg, u8 lsb_shift)
{
	struct adt7411_data *data = i2c_get_clientdata(client);
	int val, tmp;

	mutex_lock(&data->device_lock);

	val = i2c_smbus_read_byte_data(client, lsb_reg);
	if (val < 0)
		goto exit_unlock;

	tmp = (val >> lsb_shift) & 3;
	val = i2c_smbus_read_byte_data(client, msb_reg);

	if (val >= 0)
		val = (val << 2) | tmp;

 exit_unlock:
	mutex_unlock(&data->device_lock);

	return val;
}

static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
				bool flag)
{
	struct adt7411_data *data = i2c_get_clientdata(client);
	int ret, val;

	mutex_lock(&data->device_lock);

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0)
		goto exit_unlock;

	if (flag)
		val = ret | bit;
	else
		val = ret & ~bit;

	ret = i2c_smbus_write_byte_data(client, reg, val);

 exit_unlock:
	mutex_unlock(&data->device_lock);
	return ret;
}

static ssize_t adt7411_show_bit(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int ret = i2c_smbus_read_byte_data(client, attr2->index);

	return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
}

static ssize_t adt7411_set_bit(struct device *dev,
			       struct device_attribute *attr, const char *buf,
			       size_t count)
{
	struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int ret;
	unsigned long flag;

	ret = kstrtoul(buf, 0, &flag);
	if (ret || flag > 1)
		return -EINVAL;

	ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);

	/* force update */
	mutex_lock(&data->update_lock);
	data->next_update = jiffies;
	mutex_unlock(&data->update_lock);

	return ret < 0 ? ret : count;
}

#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
	SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
	adt7411_set_bit, __bit, __reg)

static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);

static struct attribute *adt7411_attrs[] = {
	&sensor_dev_attr_no_average.dev_attr.attr,
	&sensor_dev_attr_fast_sampling.dev_attr.attr,
	&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(adt7411);

static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)
{
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int ret;

	switch (attr) {
	case hwmon_in_input:
		ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
					  ADT7411_REG_VDD_MSB, 2);
		if (ret < 0)
			return ret;
		*val = ret * 7000 / 1024;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
				long *val)
{
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	int ret;
	int lsb_reg, lsb_shift;
	int nr = channel - 1;

	mutex_lock(&data->update_lock);
	if (time_after_eq(jiffies, data->next_update)) {
		ret = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
		if (ret < 0)
			goto exit_unlock;

		if (ret & ADT7411_CFG3_REF_VDD) {
			ret = adt7411_read_in_vdd(dev, hwmon_in_input,
						  &data->vref_cached);
			if (ret < 0)
				goto exit_unlock;
		} else {
			data->vref_cached = 2250;
		}

		data->next_update = jiffies + HZ;
	}

	switch (attr) {
	case hwmon_in_input:
		lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
		lsb_shift = 2 * (nr & 0x03);
		ret = adt7411_read_10_bit(client, lsb_reg,
					  ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
					  lsb_shift);
		if (ret < 0)
			goto exit_unlock;
		*val = ret * data->vref_cached / 1024;
		ret = 0;
		break;
	default:
		ret = -EOPNOTSUPP;
		break;
	}
 exit_unlock:
	mutex_unlock(&data->update_lock);
	return ret;
}

static int adt7411_read_in(struct device *dev, u32 attr, int channel,
			   long *val)
{
	if (channel == 0)
		return adt7411_read_in_vdd(dev, attr, val);
	else
		return adt7411_read_in_chan(dev, attr, channel, val);
}

static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
			     long *val)
{
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int ret, regl, regh;

	switch (attr) {
	case hwmon_temp_input:
		regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
				 ADT7411_REG_INT_TEMP_VDD_LSB;
		regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
				 ADT7411_REG_INT_TEMP_MSB;
		ret = adt7411_read_10_bit(client, regl, regh, 0);
		if (ret < 0)
			return ret;
		ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
		*val = ret * 250;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long *val)
{
	switch (type) {
	case hwmon_in:
		return adt7411_read_in(dev, attr, channel, val);
	case hwmon_temp:
		return adt7411_read_temp(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t adt7411_is_visible(const void *_data,
				  enum hwmon_sensor_types type,
				  u32 attr, int channel)
{
	const struct adt7411_data *data = _data;

	switch (type) {
	case hwmon_in:
		if (channel > 0 && channel < 3)
			return data->use_ext_temp ? 0 : S_IRUGO;
		else
			return S_IRUGO;
	case hwmon_temp:
		if (channel == 1)
			return data->use_ext_temp ? S_IRUGO : 0;
		else
			return S_IRUGO;
	default:
		return 0;
	}
}

static int adt7411_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	int val;

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

	val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
	if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
		dev_dbg(&client->dev,
			"Wrong manufacturer ID. Got %d, expected %d\n",
			val, ADT7411_MANUFACTURER_ID);
		return -ENODEV;
	}

	val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
	if (val < 0 || val != ADT7411_DEVICE_ID) {
		dev_dbg(&client->dev,
			"Wrong device ID. Got %d, expected %d\n",
			val, ADT7411_DEVICE_ID);
		return -ENODEV;
	}

	strlcpy(info->type, "adt7411", I2C_NAME_SIZE);

	return 0;
}

static int adt7411_init_device(struct adt7411_data *data)
{
	int ret;
	u8 val;

	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
	if (ret < 0)
		return ret;

	/*
	 * We must only write zero to bit 1 and bit 2 and only one to bit 3
	 * according to the datasheet.
	 */
	val = ret;
	val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
	val |= ADT7411_CFG3_RESERVED_BIT3;

	ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
	if (ret < 0)
		return ret;

	data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;

	/*
	 * We must only write zero to bit 1 and only one to bit 3 according to
	 * the datasheet.
	 */
	val = ret;
	val &= ~ADT7411_CFG1_RESERVED_BIT1;
	val |= ADT7411_CFG1_RESERVED_BIT3;

	/* enable monitoring */
	val |= ADT7411_CFG1_START_MONITOR;

	return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
}

static const u32 adt7411_in_config[] = {
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	HWMON_I_INPUT,
	0
};

static const struct hwmon_channel_info adt7411_in = {
	.type = hwmon_in,
	.config = adt7411_in_config,
};

static const u32 adt7411_temp_config[] = {
	HWMON_T_INPUT,
	HWMON_T_INPUT,
	0
};

static const struct hwmon_channel_info adt7411_temp = {
	.type = hwmon_temp,
	.config = adt7411_temp_config,
};

static const struct hwmon_channel_info *adt7411_info[] = {
	&adt7411_in,
	&adt7411_temp,
	NULL
};

static const struct hwmon_ops adt7411_hwmon_ops = {
	.is_visible = adt7411_is_visible,
	.read = adt7411_read,
};

static const struct hwmon_chip_info adt7411_chip_info = {
	.ops = &adt7411_hwmon_ops,
	.info = adt7411_info,
};

static int adt7411_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct adt7411_data *data;
	struct device *hwmon_dev;
	int ret;

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

	i2c_set_clientdata(client, data);
	data->client = client;
	mutex_init(&data->device_lock);
	mutex_init(&data->update_lock);

	ret = adt7411_init_device(data);
	if (ret < 0)
		return ret;

	/* force update on first occasion */
	data->next_update = jiffies;

	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
							 data,
							 &adt7411_chip_info,
							 adt7411_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id adt7411_id[] = {
	{ "adt7411", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adt7411_id);

static struct i2c_driver adt7411_driver = {
	.driver		= {
		.name		= "adt7411",
	},
	.probe  = adt7411_probe,
	.id_table = adt7411_id,
	.detect = adt7411_detect,
	.address_list = normal_i2c,
	.class = I2C_CLASS_HWMON,
};

module_i2c_driver(adt7411_driver);

MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
	"Wolfram Sang <w.sang@pengutronix.de>");
MODULE_DESCRIPTION("ADT7411 driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d84ca5b3 WS	1	/*
	2	* Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
	3	*
	4	* Copyright (C) 2008, 2010 Pengutronix
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
a95da110	10	* TODO: SPI, use power-down mode for suspend?, interrupt handling?
d84ca5b3 WS	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/err.h>
d84ca5b3 WS	17	#include <linux/mutex.h>
	18	#include <linux/jiffies.h>
	19	#include <linux/i2c.h>
	20	#include <linux/hwmon.h>
	21	#include <linux/hwmon-sysfs.h>
5a0e3ad6	22	#include <linux/slab.h>
d84ca5b3 WS	23
	24	#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
	25	#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
	26	#define ADT7411_REG_VDD_MSB 0x06
	27	#define ADT7411_REG_INT_TEMP_MSB 0x07
	28	#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
	29
	30	#define ADT7411_REG_CFG1 0x18
	31	#define ADT7411_CFG1_START_MONITOR (1 << 0)
601807bb	32	#define ADT7411_CFG1_RESERVED_BIT1 (1 << 1)
a95da110	33	#define ADT7411_CFG1_EXT_TDM (1 << 2)
b53893aa	34	#define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
d84ca5b3 WS	35
	36	#define ADT7411_REG_CFG2 0x19
	37	#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
	38
	39	#define ADT7411_REG_CFG3 0x1a
	40	#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
601807bb MW	41	#define ADT7411_CFG3_RESERVED_BIT1 (1 << 1)
	42	#define ADT7411_CFG3_RESERVED_BIT2 (1 << 2)
	43	#define ADT7411_CFG3_RESERVED_BIT3 (1 << 3)
d84ca5b3 WS	44	#define ADT7411_CFG3_REF_VDD (1 << 4)
	45
	46	#define ADT7411_REG_DEVICE_ID 0x4d
	47	#define ADT7411_REG_MANUFACTURER_ID 0x4e
	48
	49	#define ADT7411_DEVICE_ID 0x2
	50	#define ADT7411_MANUFACTURER_ID 0x41
	51
	52	static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
	53
	54	struct adt7411_data {
	55	struct mutex device_lock; /* for "atomic" device accesses */
23244985	56	struct mutex update_lock;
d84ca5b3	57	unsigned long next_update;
1b109c49	58	long vref_cached;
eac83cd9	59	struct i2c_client *client;
a95da110	60	bool use_ext_temp;
d84ca5b3 WS	61	};
	62
	63	/*
	64	* When reading a register containing (up to 4) lsb, all associated
	65	* msb-registers get locked by the hardware. After _one_ of those msb is read,
	66	* _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
	67	* is protected here with a mutex, too.
	68	*/
	69	static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
	70	u8 msb_reg, u8 lsb_shift)
	71	{
	72	struct adt7411_data *data = i2c_get_clientdata(client);
	73	int val, tmp;
	74
	75	mutex_lock(&data->device_lock);
	76
	77	val = i2c_smbus_read_byte_data(client, lsb_reg);
	78	if (val < 0)
	79	goto exit_unlock;
	80
	81	tmp = (val >> lsb_shift) & 3;
	82	val = i2c_smbus_read_byte_data(client, msb_reg);
	83
	84	if (val >= 0)
	85	val = (val << 2) \| tmp;
	86
	87	exit_unlock:
	88	mutex_unlock(&data->device_lock);
	89
	90	return val;
	91	}
	92
	93	static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
	94	bool flag)
	95	{
	96	struct adt7411_data *data = i2c_get_clientdata(client);
	97	int ret, val;
	98
	99	mutex_lock(&data->device_lock);
	100
	101	ret = i2c_smbus_read_byte_data(client, reg);
	102	if (ret < 0)
	103	goto exit_unlock;
	104
	105	if (flag)
	106	val = ret \| bit;
	107	else
	108	val = ret & ~bit;
	109
	110	ret = i2c_smbus_write_byte_data(client, reg, val);
	111
	112	exit_unlock:
	113	mutex_unlock(&data->device_lock);
	114	return ret;
	115	}
	116
d84ca5b3 WS	117	static ssize_t adt7411_show_bit(struct device *dev,
	118	struct device_attribute attr, char buf)
	119	{
	120	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
eac83cd9 AL	121	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	122	struct i2c_client *client = data->client;
d84ca5b3 WS	123	int ret = i2c_smbus_read_byte_data(client, attr2->index);
	124
	125	return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
	126	}
	127
	128	static ssize_t adt7411_set_bit(struct device *dev,
	129	struct device_attribute attr, const char buf,
	130	size_t count)
	131	{
	132	struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
eac83cd9 AL	133	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	134	struct i2c_client *client = data->client;
d84ca5b3 WS	135	int ret;
	136	unsigned long flag;
	137
179c4fdb	138	ret = kstrtoul(buf, 0, &flag);
d84ca5b3 WS	139	if (ret \|\| flag > 1)
	140	return -EINVAL;
	141
	142	ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
	143
	144	/* force update */
23244985	145	mutex_lock(&data->update_lock);
d84ca5b3	146	data->next_update = jiffies;
23244985	147	mutex_unlock(&data->update_lock);
d84ca5b3 WS	148
	149	return ret < 0 ? ret : count;
	150	}
	151
	152	#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
	153	SENSOR_DEVICE_ATTR_2(__name, S_IRUGO \| S_IWUSR, adt7411_show_bit, \
	154	adt7411_set_bit, __bit, __reg)
	155
d84ca5b3 WS	156	static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
	157	static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
	158	static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
	159
	160	static struct attribute *adt7411_attrs[] = {
d84ca5b3 WS	161	&sensor_dev_attr_no_average.dev_attr.attr,
	162	&sensor_dev_attr_fast_sampling.dev_attr.attr,
	163	&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
	164	NULL
	165	};
1b109c49	166	ATTRIBUTE_GROUPS(adt7411);
d84ca5b3	167
1b109c49	168	static int adt7411_read_in_vdd(struct device dev, u32 attr, long val)
a95da110	169	{
a95da110	170	struct adt7411_data *data = dev_get_drvdata(dev);
1b109c49 MW	171	struct i2c_client *client = data->client;
1b109c49 MW	172	int ret;
a95da110	173
1b109c49 MW	174	switch (attr) {
	175	case hwmon_in_input:
	176	ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
	177	ADT7411_REG_VDD_MSB, 2);
	178	if (ret < 0)
	179	return ret;
	180	val = ret 7000 / 1024;
	181	return 0;
	182	default:
	183	return -EOPNOTSUPP;
	184	}
	185	}
	186
	187	static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
	188	long *val)
	189	{
	190	struct adt7411_data *data = dev_get_drvdata(dev);
	191	struct i2c_client *client = data->client;
a95da110	192
1b109c49 MW	193	int ret;
	194	int lsb_reg, lsb_shift;
	195	int nr = channel - 1;
	196
	197	mutex_lock(&data->update_lock);
	198	if (time_after_eq(jiffies, data->next_update)) {
	199	ret = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
	200	if (ret < 0)
	201	goto exit_unlock;
	202
	203	if (ret & ADT7411_CFG3_REF_VDD) {
	204	ret = adt7411_read_in_vdd(dev, hwmon_in_input,
	205	&data->vref_cached);
	206	if (ret < 0)
	207	goto exit_unlock;
	208	} else {
	209	data->vref_cached = 2250;
	210	}
	211
	212	data->next_update = jiffies + HZ;
	213	}
	214
	215	switch (attr) {
	216	case hwmon_in_input:
	217	lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
	218	lsb_shift = 2 * (nr & 0x03);
	219	ret = adt7411_read_10_bit(client, lsb_reg,
	220	ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
	221	lsb_shift);
	222	if (ret < 0)
	223	goto exit_unlock;
	224	val = ret data->vref_cached / 1024;
	225	ret = 0;
	226	break;
	227	default:
	228	ret = -EOPNOTSUPP;
	229	break;
	230	}
	231	exit_unlock:
	232	mutex_unlock(&data->update_lock);
	233	return ret;
a95da110 MW	234	}
a95da110 MW	235
1b109c49 MW	236	static int adt7411_read_in(struct device *dev, u32 attr, int channel,
	237	long *val)
	238	{
	239	if (channel == 0)
	240	return adt7411_read_in_vdd(dev, attr, val);
	241	else
	242	return adt7411_read_in_chan(dev, attr, channel, val);
	243	}
	244
	245	static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
	246	long *val)
	247	{
	248	struct adt7411_data *data = dev_get_drvdata(dev);
	249	struct i2c_client *client = data->client;
	250	int ret, regl, regh;
	251
	252	switch (attr) {
	253	case hwmon_temp_input:
	254	regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
	255	ADT7411_REG_INT_TEMP_VDD_LSB;
	256	regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
	257	ADT7411_REG_INT_TEMP_MSB;
	258	ret = adt7411_read_10_bit(client, regl, regh, 0);
	259	if (ret < 0)
	260	return ret;
	261	ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
	262	val = ret 250;
	263	return 0;
	264	default:
	265	return -EOPNOTSUPP;
	266	}
	267	}
	268
	269	static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
	270	u32 attr, int channel, long *val)
	271	{
	272	switch (type) {
	273	case hwmon_in:
	274	return adt7411_read_in(dev, attr, channel, val);
	275	case hwmon_temp:
	276	return adt7411_read_temp(dev, attr, channel, val);
	277	default:
	278	return -EOPNOTSUPP;
	279	}
	280	}
	281
	282	static umode_t adt7411_is_visible(const void *_data,
	283	enum hwmon_sensor_types type,
	284	u32 attr, int channel)
	285	{
	286	const struct adt7411_data *data = _data;
	287
	288	switch (type) {
	289	case hwmon_in:
	290	if (channel > 0 && channel < 3)
	291	return data->use_ext_temp ? 0 : S_IRUGO;
	292	else
	293	return S_IRUGO;
	294	case hwmon_temp:
	295	if (channel == 1)
	296	return data->use_ext_temp ? S_IRUGO : 0;
	297	else
	298	return S_IRUGO;
	299	default:
300	return 0;
301	}
302	}
d84ca5b3 WS	303
	304	static int adt7411_detect(struct i2c_client *client,
	305	struct i2c_board_info *info)
	306	{
	307	int val;
	308
	309	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	310	return -ENODEV;
	311
	312	val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
	313	if (val < 0 \|\| val != ADT7411_MANUFACTURER_ID) {
b55f3757 GR	314	dev_dbg(&client->dev,
	315	"Wrong manufacturer ID. Got %d, expected %d\n",
	316	val, ADT7411_MANUFACTURER_ID);
d84ca5b3 WS	317	return -ENODEV;
	318	}
	319
	320	val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
	321	if (val < 0 \|\| val != ADT7411_DEVICE_ID) {
b55f3757 GR	322	dev_dbg(&client->dev,
	323	"Wrong device ID. Got %d, expected %d\n",
	324	val, ADT7411_DEVICE_ID);
d84ca5b3 WS	325	return -ENODEV;
	326	}
	327
	328	strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
	329
	330	return 0;
	331	}
	332
601807bb MW	333	static int adt7411_init_device(struct adt7411_data *data)
	334	{
	335	int ret;
	336	u8 val;
	337
	338	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
	339	if (ret < 0)
	340	return ret;
	341
	342	/*
	343	* We must only write zero to bit 1 and bit 2 and only one to bit 3
	344	* according to the datasheet.
	345	*/
	346	val = ret;
	347	val &= ~(ADT7411_CFG3_RESERVED_BIT1 \| ADT7411_CFG3_RESERVED_BIT2);
	348	val \|= ADT7411_CFG3_RESERVED_BIT3;
	349
	350	ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
	351	if (ret < 0)
	352	return ret;
	353
	354	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
	355	if (ret < 0)
	356	return ret;
	357
a95da110 MW	358	data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
a95da110 MW	359
601807bb MW	360	/*
	361	* We must only write zero to bit 1 and only one to bit 3 according to
	362	* the datasheet.
	363	*/
	364	val = ret;
	365	val &= ~ADT7411_CFG1_RESERVED_BIT1;
	366	val \|= ADT7411_CFG1_RESERVED_BIT3;
	367
	368	/* enable monitoring */
	369	val \|= ADT7411_CFG1_START_MONITOR;
	370
	371	return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
	372	}
	373
1b109c49 MW	374	static const u32 adt7411_in_config[] = {
	375	HWMON_I_INPUT,
	376	HWMON_I_INPUT,
	377	HWMON_I_INPUT,
	378	HWMON_I_INPUT,
	379	HWMON_I_INPUT,
	380	HWMON_I_INPUT,
	381	HWMON_I_INPUT,
	382	HWMON_I_INPUT,
	383	HWMON_I_INPUT,
	384	0
	385	};
	386
	387	static const struct hwmon_channel_info adt7411_in = {
	388	.type = hwmon_in,
	389	.config = adt7411_in_config,
	390	};
	391
	392	static const u32 adt7411_temp_config[] = {
	393	HWMON_T_INPUT,
	394	HWMON_T_INPUT,
	395	0
	396	};
	397
	398	static const struct hwmon_channel_info adt7411_temp = {
	399	.type = hwmon_temp,
	400	.config = adt7411_temp_config,
	401	};
	402
	403	static const struct hwmon_channel_info *adt7411_info[] = {
	404	&adt7411_in,
	405	&adt7411_temp,
	406	NULL
	407	};
	408
	409	static const struct hwmon_ops adt7411_hwmon_ops = {
	410	.is_visible = adt7411_is_visible,
	411	.read = adt7411_read,
	412	};
	413
	414	static const struct hwmon_chip_info adt7411_chip_info = {
	415	.ops = &adt7411_hwmon_ops,
	416	.info = adt7411_info,
	417	};
	418
6c931ae1	419	static int adt7411_probe(struct i2c_client *client,
d84ca5b3 WS	420	const struct i2c_device_id *id)
d84ca5b3 WS	421	{
eac83cd9	422	struct device *dev = &client->dev;
d84ca5b3	423	struct adt7411_data *data;
eac83cd9	424	struct device *hwmon_dev;
d84ca5b3 WS	425	int ret;
d84ca5b3 WS	426
eac83cd9	427	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
d84ca5b3 WS	428	if (!data)
	429	return -ENOMEM;
	430
	431	i2c_set_clientdata(client, data);
eac83cd9	432	data->client = client;
d84ca5b3	433	mutex_init(&data->device_lock);
23244985	434	mutex_init(&data->update_lock);
d84ca5b3	435
601807bb	436	ret = adt7411_init_device(data);
d84ca5b3	437	if (ret < 0)
65ec17b0	438	return ret;
d84ca5b3 WS	439
	440	/* force update on first occasion */
	441	data->next_update = jiffies;
	442
1b109c49 MW	443	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
	444	data,
	445	&adt7411_chip_info,
	446	adt7411_groups);
eac83cd9	447	return PTR_ERR_OR_ZERO(hwmon_dev);
d84ca5b3 WS	448	}
	449
	450	static const struct i2c_device_id adt7411_id[] = {
	451	{ "adt7411", 0 },
	452	{ }
	453	};
a7254d68	454	MODULE_DEVICE_TABLE(i2c, adt7411_id);
d84ca5b3 WS	455
	456	static struct i2c_driver adt7411_driver = {
	457	.driver = {
	458	.name = "adt7411",
	459	},
	460	.probe = adt7411_probe,
d84ca5b3 WS	461	.id_table = adt7411_id,
	462	.detect = adt7411_detect,
	463	.address_list = normal_i2c,
	464	.class = I2C_CLASS_HWMON,
	465	};
	466
f0967eea	467	module_i2c_driver(adt7411_driver);
d84ca5b3 WS	468
	469	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
	470	"Wolfram Sang <w.sang@pengutronix.de>");
	471	MODULE_DESCRIPTION("ADT7411 driver");
	472	MODULE_LICENSE("GPL v2");