[deliverable/linux.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;
	int 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_vdd(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
			ADT7411_REG_VDD_MSB, 2);

	return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
}

static ssize_t adt7411_show_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int val;
	struct {
		u8 low;
		u8 high;
	} reg[2] = {
		{ ADT7411_REG_INT_TEMP_VDD_LSB, ADT7411_REG_INT_TEMP_MSB },
		{ ADT7411_REG_EXT_TEMP_AIN14_LSB,
		  ADT7411_REG_EXT_TEMP_AIN1_MSB },
	};

	val = adt7411_read_10_bit(client, reg[nr].low, reg[nr].high, 0);
	if (val < 0)
		return val;

	val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */

	return sprintf(buf, "%d\n", val * 250);
}

static ssize_t adt7411_show_input(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct adt7411_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int val;
	u8 lsb_reg, lsb_shift;

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

		if (val & ADT7411_CFG3_REF_VDD) {
			val = adt7411_read_10_bit(client,
					ADT7411_REG_INT_TEMP_VDD_LSB,
					ADT7411_REG_VDD_MSB, 2);
			if (val < 0)
				goto exit_unlock;

			data->vref_cached = val * 7000 / 1024;
		} else {
			data->vref_cached = 2250;
		}

		data->next_update = jiffies + HZ;
	}

	lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
	lsb_shift = 2 * (nr & 0x03);
	val = adt7411_read_10_bit(client, lsb_reg,
			ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
	if (val < 0)
		goto exit_unlock;

	val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
 exit_unlock:
	mutex_unlock(&data->update_lock);
	return val;
}

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 SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, adt7411_show_temp, NULL, 1);
static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
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_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&dev_attr_in0_input.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in8_input.dev_attr.attr,
	&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
};

static umode_t adt7411_attrs_visible(struct kobject *kobj,
				     struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct adt7411_data *data = dev_get_drvdata(dev);
	bool visible = true;

	if (attr == &sensor_dev_attr_temp2_input.dev_attr.attr)
		visible = data->use_ext_temp;
	else if (attr == &sensor_dev_attr_in1_input.dev_attr.attr ||
		 attr == &sensor_dev_attr_in2_input.dev_attr.attr)
		visible = !data->use_ext_temp;

	return visible ? attr->mode : 0;
}

static const struct attribute_group adt7411_group = {
	.attrs = adt7411_attrs,
	.is_visible = adt7411_attrs_visible,
};
__ATTRIBUTE_GROUPS(adt7411);

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 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_groups(dev, client->name,
							   data,
							   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 WS	57	unsigned long next_update;
d84ca5b3 WS	58	int 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
	117	static ssize_t adt7411_show_vdd(struct device *dev,
	118	struct device_attribute attr, char buf)
	119	{
eac83cd9 AL	120	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	121	struct i2c_client *client = data->client;
d84ca5b3 WS	122	int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
	123	ADT7411_REG_VDD_MSB, 2);
	124
	125	return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
	126	}
	127
	128	static ssize_t adt7411_show_temp(struct device *dev,
	129	struct device_attribute attr, char buf)
	130	{
a95da110	131	int nr = to_sensor_dev_attr(attr)->index;
eac83cd9 AL	132	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	133	struct i2c_client *client = data->client;
a95da110 MW	134	int val;
	135	struct {
	136	u8 low;
	137	u8 high;
	138	} reg[2] = {
	139	{ ADT7411_REG_INT_TEMP_VDD_LSB, ADT7411_REG_INT_TEMP_MSB },
	140	{ ADT7411_REG_EXT_TEMP_AIN14_LSB,
	141	ADT7411_REG_EXT_TEMP_AIN1_MSB },
	142	};
	143
	144	val = adt7411_read_10_bit(client, reg[nr].low, reg[nr].high, 0);
d84ca5b3 WS	145	if (val < 0)
	146	return val;
	147
	148	val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
	149
	150	return sprintf(buf, "%d\n", val * 250);
	151	}
	152
	153	static ssize_t adt7411_show_input(struct device *dev,
	154	struct device_attribute attr, char buf)
	155	{
	156	int nr = to_sensor_dev_attr(attr)->index;
eac83cd9 AL	157	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	158	struct i2c_client *client = data->client;
d84ca5b3 WS	159	int val;
	160	u8 lsb_reg, lsb_shift;
	161
23244985	162	mutex_lock(&data->update_lock);
d84ca5b3 WS	163	if (time_after_eq(jiffies, data->next_update)) {
	164	val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
	165	if (val < 0)
23244985	166	goto exit_unlock;
d84ca5b3	167
23244985	168	if (val & ADT7411_CFG3_REF_VDD) {
d84ca5b3 WS	169	val = adt7411_read_10_bit(client,
	170	ADT7411_REG_INT_TEMP_VDD_LSB,
	171	ADT7411_REG_VDD_MSB, 2);
	172	if (val < 0)
23244985	173	goto exit_unlock;
d84ca5b3 WS	174
	175	data->vref_cached = val * 7000 / 1024;
	176	} else {
	177	data->vref_cached = 2250;
	178	}
	179
	180	data->next_update = jiffies + HZ;
	181	}
	182
	183	lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
	184	lsb_shift = 2 * (nr & 0x03);
	185	val = adt7411_read_10_bit(client, lsb_reg,
	186	ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
23244985 WS	187	if (val < 0)
23244985 WS	188	goto exit_unlock;
d84ca5b3	189
23244985 WS	190	val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
	191	exit_unlock:
	192	mutex_unlock(&data->update_lock);
	193	return val;
d84ca5b3 WS	194	}
	195
	196	static ssize_t adt7411_show_bit(struct device *dev,
	197	struct device_attribute attr, char buf)
	198	{
	199	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
eac83cd9 AL	200	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	201	struct i2c_client *client = data->client;
d84ca5b3 WS	202	int ret = i2c_smbus_read_byte_data(client, attr2->index);
	203
	204	return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
	205	}
	206
	207	static ssize_t adt7411_set_bit(struct device *dev,
	208	struct device_attribute attr, const char buf,
	209	size_t count)
	210	{
	211	struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
eac83cd9 AL	212	struct adt7411_data *data = dev_get_drvdata(dev);
eac83cd9 AL	213	struct i2c_client *client = data->client;
d84ca5b3 WS	214	int ret;
	215	unsigned long flag;
	216
179c4fdb	217	ret = kstrtoul(buf, 0, &flag);
d84ca5b3 WS	218	if (ret \|\| flag > 1)
	219	return -EINVAL;
	220
	221	ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
	222
	223	/* force update */
23244985	224	mutex_lock(&data->update_lock);
d84ca5b3	225	data->next_update = jiffies;
23244985	226	mutex_unlock(&data->update_lock);
d84ca5b3 WS	227
	228	return ret < 0 ? ret : count;
	229	}
	230
a95da110	231
d84ca5b3 WS	232	#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
	233	SENSOR_DEVICE_ATTR_2(__name, S_IRUGO \| S_IWUSR, adt7411_show_bit, \
	234	adt7411_set_bit, __bit, __reg)
	235
a95da110 MW	236	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL, 0);
a95da110 MW	237	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, adt7411_show_temp, NULL, 1);
d84ca5b3 WS	238	static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
	239	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
	240	static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
	241	static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
	242	static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
	243	static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
	244	static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
	245	static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
	246	static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
	247	static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
	248	static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
	249	static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
	250
	251	static struct attribute *adt7411_attrs[] = {
a95da110 MW	252	&sensor_dev_attr_temp1_input.dev_attr.attr,
a95da110 MW	253	&sensor_dev_attr_temp2_input.dev_attr.attr,
d84ca5b3 WS	254	&dev_attr_in0_input.attr,
	255	&sensor_dev_attr_in1_input.dev_attr.attr,
	256	&sensor_dev_attr_in2_input.dev_attr.attr,
	257	&sensor_dev_attr_in3_input.dev_attr.attr,
	258	&sensor_dev_attr_in4_input.dev_attr.attr,
	259	&sensor_dev_attr_in5_input.dev_attr.attr,
	260	&sensor_dev_attr_in6_input.dev_attr.attr,
	261	&sensor_dev_attr_in7_input.dev_attr.attr,
	262	&sensor_dev_attr_in8_input.dev_attr.attr,
	263	&sensor_dev_attr_no_average.dev_attr.attr,
	264	&sensor_dev_attr_fast_sampling.dev_attr.attr,
	265	&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
	266	NULL
	267	};
	268
a95da110 MW	269	static umode_t adt7411_attrs_visible(struct kobject *kobj,
	270	struct attribute *attr, int index)
	271	{
	272	struct device *dev = container_of(kobj, struct device, kobj);
	273	struct adt7411_data *data = dev_get_drvdata(dev);
	274	bool visible = true;
	275
	276	if (attr == &sensor_dev_attr_temp2_input.dev_attr.attr)
	277	visible = data->use_ext_temp;
	278	else if (attr == &sensor_dev_attr_in1_input.dev_attr.attr \|\|
	279	attr == &sensor_dev_attr_in2_input.dev_attr.attr)
	280	visible = !data->use_ext_temp;
	281
	282	return visible ? attr->mode : 0;
	283	}
	284
	285	static const struct attribute_group adt7411_group = {
	286	.attrs = adt7411_attrs,
	287	.is_visible = adt7411_attrs_visible,
	288	};
	289	__ATTRIBUTE_GROUPS(adt7411);
d84ca5b3 WS	290
	291	static int adt7411_detect(struct i2c_client *client,
	292	struct i2c_board_info *info)
	293	{
	294	int val;
	295
	296	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	297	return -ENODEV;
	298
	299	val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
	300	if (val < 0 \|\| val != ADT7411_MANUFACTURER_ID) {
b55f3757 GR	301	dev_dbg(&client->dev,
	302	"Wrong manufacturer ID. Got %d, expected %d\n",
	303	val, ADT7411_MANUFACTURER_ID);
d84ca5b3 WS	304	return -ENODEV;
	305	}
	306
	307	val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
	308	if (val < 0 \|\| val != ADT7411_DEVICE_ID) {
b55f3757 GR	309	dev_dbg(&client->dev,
	310	"Wrong device ID. Got %d, expected %d\n",
	311	val, ADT7411_DEVICE_ID);
d84ca5b3 WS	312	return -ENODEV;
	313	}
	314
	315	strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
	316
	317	return 0;
	318	}
	319
601807bb MW	320	static int adt7411_init_device(struct adt7411_data *data)
	321	{
	322	int ret;
	323	u8 val;
	324
	325	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
	326	if (ret < 0)
	327	return ret;
	328
	329	/*
	330	* We must only write zero to bit 1 and bit 2 and only one to bit 3
	331	* according to the datasheet.
	332	*/
	333	val = ret;
	334	val &= ~(ADT7411_CFG3_RESERVED_BIT1 \| ADT7411_CFG3_RESERVED_BIT2);
	335	val \|= ADT7411_CFG3_RESERVED_BIT3;
	336
	337	ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
	338	if (ret < 0)
	339	return ret;
	340
	341	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
	342	if (ret < 0)
	343	return ret;
	344
a95da110 MW	345	data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
a95da110 MW	346
601807bb MW	347	/*
	348	* We must only write zero to bit 1 and only one to bit 3 according to
	349	* the datasheet.
	350	*/
	351	val = ret;
	352	val &= ~ADT7411_CFG1_RESERVED_BIT1;
	353	val \|= ADT7411_CFG1_RESERVED_BIT3;
	354
	355	/* enable monitoring */
	356	val \|= ADT7411_CFG1_START_MONITOR;
	357
	358	return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
	359	}
	360
6c931ae1	361	static int adt7411_probe(struct i2c_client *client,
d84ca5b3 WS	362	const struct i2c_device_id *id)
d84ca5b3 WS	363	{
eac83cd9	364	struct device *dev = &client->dev;
d84ca5b3	365	struct adt7411_data *data;
eac83cd9	366	struct device *hwmon_dev;
d84ca5b3 WS	367	int ret;
d84ca5b3 WS	368
eac83cd9	369	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
d84ca5b3 WS	370	if (!data)
	371	return -ENOMEM;
	372
	373	i2c_set_clientdata(client, data);
eac83cd9	374	data->client = client;
d84ca5b3	375	mutex_init(&data->device_lock);
23244985	376	mutex_init(&data->update_lock);
d84ca5b3	377
601807bb	378	ret = adt7411_init_device(data);
d84ca5b3	379	if (ret < 0)
65ec17b0	380	return ret;
d84ca5b3 WS	381
	382	/* force update on first occasion */
	383	data->next_update = jiffies;
	384
eac83cd9 AL	385	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	386	data,
	387	adt7411_groups);
	388	return PTR_ERR_OR_ZERO(hwmon_dev);
d84ca5b3 WS	389	}
	390
	391	static const struct i2c_device_id adt7411_id[] = {
	392	{ "adt7411", 0 },
	393	{ }
	394	};
a7254d68	395	MODULE_DEVICE_TABLE(i2c, adt7411_id);
d84ca5b3 WS	396
	397	static struct i2c_driver adt7411_driver = {
	398	.driver = {
	399	.name = "adt7411",
	400	},
	401	.probe = adt7411_probe,
d84ca5b3 WS	402	.id_table = adt7411_id,
	403	.detect = adt7411_detect,
	404	.address_list = normal_i2c,
	405	.class = I2C_CLASS_HWMON,
	406	};
	407
f0967eea	408	module_i2c_driver(adt7411_driver);
d84ca5b3 WS	409
	410	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
	411	"Wolfram Sang <w.sang@pengutronix.de>");
	412	MODULE_DESCRIPTION("ADT7411 driver");
	413	MODULE_LICENSE("GPL v2");