[linux-2.6-block.git] / drivers / hwmon / ltc2990.c

/*
 * Driver for Linear Technology LTC2990 power monitor
 *
 * Copyright (C) 2014 Topic Embedded Products
 * Author: Mike Looijmans <mike.looijmans@topic.nl>
 *
 * License: GPLv2
 */

#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>

#define LTC2990_STATUS	0x00
#define LTC2990_CONTROL	0x01
#define LTC2990_TRIGGER	0x02
#define LTC2990_TINT_MSB	0x04
#define LTC2990_V1_MSB	0x06
#define LTC2990_V2_MSB	0x08
#define LTC2990_V3_MSB	0x0A
#define LTC2990_V4_MSB	0x0C
#define LTC2990_VCC_MSB	0x0E

#define LTC2990_IN0	BIT(0)
#define LTC2990_IN1	BIT(1)
#define LTC2990_IN2	BIT(2)
#define LTC2990_IN3	BIT(3)
#define LTC2990_IN4	BIT(4)
#define LTC2990_CURR1	BIT(5)
#define LTC2990_CURR2	BIT(6)
#define LTC2990_TEMP1	BIT(7)
#define LTC2990_TEMP2	BIT(8)
#define LTC2990_TEMP3	BIT(9)
#define LTC2990_NONE	0
#define LTC2990_ALL	GENMASK(9, 0)

#define LTC2990_MODE0_SHIFT	0
#define LTC2990_MODE0_MASK	GENMASK(2, 0)
#define LTC2990_MODE1_SHIFT	3
#define LTC2990_MODE1_MASK	GENMASK(1, 0)

/* Enabled measurements for mode bits 2..0 */
static const int ltc2990_attrs_ena_0[] = {
	LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3,
	LTC2990_CURR1 | LTC2990_TEMP3,
	LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4,
	LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4,
	LTC2990_TEMP2 | LTC2990_CURR2,
	LTC2990_TEMP2 | LTC2990_TEMP3,
	LTC2990_CURR1 | LTC2990_CURR2,
	LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4
};

/* Enabled measurements for mode bits 4..3 */
static const int ltc2990_attrs_ena_1[] = {
	LTC2990_NONE,
	LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1,
	LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2,
	LTC2990_ALL
};

struct ltc2990_data {
	struct i2c_client *i2c;
	u32 mode[2];
};

/* Return the converted value from the given register in uV or mC */
static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result)
{
	int val;
	u8 reg;

	switch (index) {
	case LTC2990_IN0:
		reg = LTC2990_VCC_MSB;
		break;
	case LTC2990_IN1:
	case LTC2990_CURR1:
	case LTC2990_TEMP2:
		reg = LTC2990_V1_MSB;
		break;
	case LTC2990_IN2:
		reg = LTC2990_V2_MSB;
		break;
	case LTC2990_IN3:
	case LTC2990_CURR2:
	case LTC2990_TEMP3:
		reg = LTC2990_V3_MSB;
		break;
	case LTC2990_IN4:
		reg = LTC2990_V4_MSB;
		break;
	case LTC2990_TEMP1:
		reg = LTC2990_TINT_MSB;
		break;
	default:
		return -EINVAL;
	}

	val = i2c_smbus_read_word_swapped(i2c, reg);
	if (unlikely(val < 0))
		return val;

	switch (index) {
	case LTC2990_TEMP1:
	case LTC2990_TEMP2:
	case LTC2990_TEMP3:
		/* temp, 0.0625 degrees/LSB */
		*result = sign_extend32(val, 12) * 1000 / 16;
		break;
	case LTC2990_CURR1:
	case LTC2990_CURR2:
		 /* Vx-Vy, 19.42uV/LSB */
		*result = sign_extend32(val, 14) * 1942 / 100;
		break;
	case LTC2990_IN0:
		/* Vcc, 305.18uV/LSB, 2.5V offset */
		*result = sign_extend32(val, 14) * 30518 / (100 * 1000) + 2500;
		break;
	case LTC2990_IN1:
	case LTC2990_IN2:
	case LTC2990_IN3:
	case LTC2990_IN4:
		/* Vx, 305.18uV/LSB */
		*result = sign_extend32(val, 14) * 30518 / (100 * 1000);
		break;
	default:
		return -EINVAL; /* won't happen, keep compiler happy */
	}

	return 0;
}

static ssize_t ltc2990_value_show(struct device *dev,
				  struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ltc2990_data *data = dev_get_drvdata(dev);
	int value;
	int ret;

	ret = ltc2990_get_value(data->i2c, attr->index, &value);
	if (unlikely(ret < 0))
		return ret;

	return snprintf(buf, PAGE_SIZE, "%d\n", value);
}

static umode_t ltc2990_attrs_visible(struct kobject *kobj,
				     struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct ltc2990_data *data = dev_get_drvdata(dev);
	struct device_attribute *da =
			container_of(a, struct device_attribute, attr);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);

	int attrs_mask = LTC2990_IN0 | LTC2990_TEMP1 |
			 (ltc2990_attrs_ena_0[data->mode[0]] &
			  ltc2990_attrs_ena_1[data->mode[1]]);

	if (attr->index & attrs_mask)
		return a->mode;

	return 0;
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1);
static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2);
static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3);
static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1);
static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2);
static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0);
static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1);
static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2);
static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3);
static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4);

static struct attribute *ltc2990_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_curr2_input.dev_attr.attr,
	&sensor_dev_attr_in0_input.dev_attr.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,
	NULL,
};

static const struct attribute_group ltc2990_group = {
	.attrs = ltc2990_attrs,
	.is_visible = ltc2990_attrs_visible,
};
__ATTRIBUTE_GROUPS(ltc2990);

static int ltc2990_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	int ret;
	struct device *hwmon_dev;
	struct ltc2990_data *data;
	struct device_node *of_node = i2c->dev.of_node;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL);
	if (unlikely(!data))
		return -ENOMEM;

	data->i2c = i2c;

	if (of_node) {
		ret = of_property_read_u32_array(of_node, "lltc,meas-mode",
						 data->mode, 2);
		if (ret < 0)
			return ret;

		if (data->mode[0] & ~LTC2990_MODE0_MASK ||
		    data->mode[1] & ~LTC2990_MODE1_MASK)
			return -EINVAL;
	} else {
		ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL);
		if (ret < 0)
			return ret;

		data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK;
		data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK;
	}

	/* Setup continuous mode */
	ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL,
					data->mode[0] << LTC2990_MODE0_SHIFT |
					data->mode[1] << LTC2990_MODE1_SHIFT);
	if (ret < 0) {
		dev_err(&i2c->dev, "Error: Failed to set control mode.\n");
		return ret;
	}
	/* Trigger once to start continuous conversion */
	ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1);
	if (ret < 0) {
		dev_err(&i2c->dev, "Error: Failed to start acquisition.\n");
		return ret;
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev,
							   i2c->name,
							   data,
							   ltc2990_groups);

	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id ltc2990_i2c_id[] = {
	{ "ltc2990", 0 },
	{}
};
MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id);

static struct i2c_driver ltc2990_i2c_driver = {
	.driver = {
		.name = "ltc2990",
	},
	.probe    = ltc2990_i2c_probe,
	.id_table = ltc2990_i2c_id,
};

module_i2c_driver(ltc2990_i2c_driver);

MODULE_DESCRIPTION("LTC2990 Sensor Driver");
MODULE_AUTHOR("Topic Embedded Products");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
df922703 ML	1	/*
	2	* Driver for Linear Technology LTC2990 power monitor
	3	*
	4	* Copyright (C) 2014 Topic Embedded Products
	5	* Author: Mike Looijmans <mike.looijmans@topic.nl>
	6	*
	7	* License: GPLv2
df922703 ML	8	*/
df922703 ML	9
a6282d17	10	#include <linux/bitops.h>
df922703 ML	11	#include <linux/err.h>
	12	#include <linux/hwmon.h>
	13	#include <linux/hwmon-sysfs.h>
	14	#include <linux/i2c.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
5d9ca430	17	#include <linux/of.h>
df922703 ML	18
	19	#define LTC2990_STATUS 0x00
	20	#define LTC2990_CONTROL 0x01
	21	#define LTC2990_TRIGGER 0x02
	22	#define LTC2990_TINT_MSB 0x04
	23	#define LTC2990_V1_MSB 0x06
	24	#define LTC2990_V2_MSB 0x08
	25	#define LTC2990_V3_MSB 0x0A
	26	#define LTC2990_V4_MSB 0x0C
	27	#define LTC2990_VCC_MSB 0x0E
	28
5d9ca430 TL	29	#define LTC2990_IN0 BIT(0)
	30	#define LTC2990_IN1 BIT(1)
	31	#define LTC2990_IN2 BIT(2)
	32	#define LTC2990_IN3 BIT(3)
	33	#define LTC2990_IN4 BIT(4)
	34	#define LTC2990_CURR1 BIT(5)
	35	#define LTC2990_CURR2 BIT(6)
	36	#define LTC2990_TEMP1 BIT(7)
	37	#define LTC2990_TEMP2 BIT(8)
	38	#define LTC2990_TEMP3 BIT(9)
	39	#define LTC2990_NONE 0
	40	#define LTC2990_ALL GENMASK(9, 0)
	41
	42	#define LTC2990_MODE0_SHIFT 0
	43	#define LTC2990_MODE0_MASK GENMASK(2, 0)
	44	#define LTC2990_MODE1_SHIFT 3
	45	#define LTC2990_MODE1_MASK GENMASK(1, 0)
	46
	47	/* Enabled measurements for mode bits 2..0 */
	48	static const int ltc2990_attrs_ena_0[] = {
	49	LTC2990_IN1 \| LTC2990_IN2 \| LTC2990_TEMP3,
	50	LTC2990_CURR1 \| LTC2990_TEMP3,
	51	LTC2990_CURR1 \| LTC2990_IN3 \| LTC2990_IN4,
	52	LTC2990_TEMP2 \| LTC2990_IN3 \| LTC2990_IN4,
	53	LTC2990_TEMP2 \| LTC2990_CURR2,
	54	LTC2990_TEMP2 \| LTC2990_TEMP3,
	55	LTC2990_CURR1 \| LTC2990_CURR2,
	56	LTC2990_IN1 \| LTC2990_IN2 \| LTC2990_IN3 \| LTC2990_IN4
	57	};
	58
	59	/* Enabled measurements for mode bits 4..3 */
	60	static const int ltc2990_attrs_ena_1[] = {
	61	LTC2990_NONE,
	62	LTC2990_TEMP2 \| LTC2990_IN1 \| LTC2990_CURR1,
	63	LTC2990_TEMP3 \| LTC2990_IN3 \| LTC2990_CURR2,
	64	LTC2990_ALL
	65	};
	66
	67	struct ltc2990_data {
	68	struct i2c_client *i2c;
	69	u32 mode[2];
	70	};
df922703	71
df922703	72	/* Return the converted value from the given register in uV or mC */
5d9ca430	73	static int ltc2990_get_value(struct i2c_client i2c, int index, int result)
df922703 ML	74	{
df922703 ML	75	int val;
5d9ca430 TL	76	u8 reg;
	77
	78	switch (index) {
	79	case LTC2990_IN0:
	80	reg = LTC2990_VCC_MSB;
	81	break;
	82	case LTC2990_IN1:
	83	case LTC2990_CURR1:
	84	case LTC2990_TEMP2:
	85	reg = LTC2990_V1_MSB;
	86	break;
	87	case LTC2990_IN2:
	88	reg = LTC2990_V2_MSB;
	89	break;
	90	case LTC2990_IN3:
	91	case LTC2990_CURR2:
	92	case LTC2990_TEMP3:
	93	reg = LTC2990_V3_MSB;
	94	break;
	95	case LTC2990_IN4:
	96	reg = LTC2990_V4_MSB;
	97	break;
	98	case LTC2990_TEMP1:
	99	reg = LTC2990_TINT_MSB;
	100	break;
	101	default:
	102	return -EINVAL;
	103	}
df922703 ML	104
	105	val = i2c_smbus_read_word_swapped(i2c, reg);
	106	if (unlikely(val < 0))
	107	return val;
	108
5d9ca430 TL	109	switch (index) {
	110	case LTC2990_TEMP1:
	111	case LTC2990_TEMP2:
	112	case LTC2990_TEMP3:
	113	/* temp, 0.0625 degrees/LSB */
a6282d17	114	result = sign_extend32(val, 12) 1000 / 16;
df922703	115	break;
5d9ca430 TL	116	case LTC2990_CURR1:
	117	case LTC2990_CURR2:
	118	/* Vx-Vy, 19.42uV/LSB */
a6282d17	119	result = sign_extend32(val, 14) 1942 / 100;
df922703	120	break;
5d9ca430 TL	121	case LTC2990_IN0:
5d9ca430 TL	122	/* Vcc, 305.18uV/LSB, 2.5V offset */
a6282d17	123	result = sign_extend32(val, 14) 30518 / (100 * 1000) + 2500;
df922703	124	break;
5d9ca430 TL	125	case LTC2990_IN1:
	126	case LTC2990_IN2:
	127	case LTC2990_IN3:
	128	case LTC2990_IN4:
	129	/* Vx, 305.18uV/LSB */
	130	result = sign_extend32(val, 14) 30518 / (100 * 1000);
	131	break;
df922703 ML	132	default:
	133	return -EINVAL; /* won't happen, keep compiler happy */
	134	}
	135
	136	return 0;
	137	}
	138
bbc7a6b5	139	static ssize_t ltc2990_value_show(struct device *dev,
df922703 ML	140	struct device_attribute da, char buf)
	141	{
	142	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
5d9ca430	143	struct ltc2990_data *data = dev_get_drvdata(dev);
df922703 ML	144	int value;
	145	int ret;
	146
5d9ca430	147	ret = ltc2990_get_value(data->i2c, attr->index, &value);
df922703 ML	148	if (unlikely(ret < 0))
	149	return ret;
	150
	151	return snprintf(buf, PAGE_SIZE, "%d\n", value);
	152	}
	153
5d9ca430 TL	154	static umode_t ltc2990_attrs_visible(struct kobject *kobj,
	155	struct attribute *a, int n)
	156	{
	157	struct device *dev = container_of(kobj, struct device, kobj);
	158	struct ltc2990_data *data = dev_get_drvdata(dev);
	159	struct device_attribute *da =
	160	container_of(a, struct device_attribute, attr);
	161	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	162
	163	int attrs_mask = LTC2990_IN0 \| LTC2990_TEMP1 \|
	164	(ltc2990_attrs_ena_0[data->mode[0]] &
	165	ltc2990_attrs_ena_1[data->mode[1]]);
	166
	167	if (attr->index & attrs_mask)
	168	return a->mode;
	169
	170	return 0;
	171	}
	172
bbc7a6b5 GR	173	static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1);
	174	static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2);
	175	static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3);
	176	static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1);
	177	static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2);
	178	static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0);
	179	static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1);
	180	static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2);
	181	static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3);
	182	static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4);
df922703 ML	183
	184	static struct attribute *ltc2990_attrs[] = {
	185	&sensor_dev_attr_temp1_input.dev_attr.attr,
5d9ca430 TL	186	&sensor_dev_attr_temp2_input.dev_attr.attr,
5d9ca430 TL	187	&sensor_dev_attr_temp3_input.dev_attr.attr,
df922703 ML	188	&sensor_dev_attr_curr1_input.dev_attr.attr,
	189	&sensor_dev_attr_curr2_input.dev_attr.attr,
	190	&sensor_dev_attr_in0_input.dev_attr.attr,
5d9ca430 TL	191	&sensor_dev_attr_in1_input.dev_attr.attr,
	192	&sensor_dev_attr_in2_input.dev_attr.attr,
	193	&sensor_dev_attr_in3_input.dev_attr.attr,
	194	&sensor_dev_attr_in4_input.dev_attr.attr,
df922703 ML	195	NULL,
df922703 ML	196	};
5d9ca430 TL	197
	198	static const struct attribute_group ltc2990_group = {
	199	.attrs = ltc2990_attrs,
	200	.is_visible = ltc2990_attrs_visible,
	201	};
	202	__ATTRIBUTE_GROUPS(ltc2990);
df922703 ML	203
	204	static int ltc2990_i2c_probe(struct i2c_client *i2c,
	205	const struct i2c_device_id *id)
	206	{
	207	int ret;
	208	struct device *hwmon_dev;
5d9ca430 TL	209	struct ltc2990_data *data;
5d9ca430 TL	210	struct device_node *of_node = i2c->dev.of_node;
df922703 ML	211
	212	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	213	I2C_FUNC_SMBUS_WORD_DATA))
	214	return -ENODEV;
	215
5d9ca430 TL	216	data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL);
	217	if (unlikely(!data))
	218	return -ENOMEM;
	219
	220	data->i2c = i2c;
	221
	222	if (of_node) {
	223	ret = of_property_read_u32_array(of_node, "lltc,meas-mode",
	224	data->mode, 2);
	225	if (ret < 0)
	226	return ret;
	227
	228	if (data->mode[0] & ~LTC2990_MODE0_MASK \|\|
	229	data->mode[1] & ~LTC2990_MODE1_MASK)
	230	return -EINVAL;
	231	} else {
	232	ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL);
	233	if (ret < 0)
	234	return ret;
	235
	236	data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK;
	237	data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK;
	238	}
	239
	240	/* Setup continuous mode */
df922703	241	ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL,
5d9ca430 TL	242	data->mode[0] << LTC2990_MODE0_SHIFT \|
5d9ca430 TL	243	data->mode[1] << LTC2990_MODE1_SHIFT);
df922703 ML	244	if (ret < 0) {
	245	dev_err(&i2c->dev, "Error: Failed to set control mode.\n");
	246	return ret;
	247	}
	248	/* Trigger once to start continuous conversion */
	249	ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1);
	250	if (ret < 0) {
	251	dev_err(&i2c->dev, "Error: Failed to start acquisition.\n");
	252	return ret;
	253	}
	254
	255	hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev,
	256	i2c->name,
5d9ca430	257	data,
df922703 ML	258	ltc2990_groups);
	259
	260	return PTR_ERR_OR_ZERO(hwmon_dev);
	261	}
	262
	263	static const struct i2c_device_id ltc2990_i2c_id[] = {
	264	{ "ltc2990", 0 },
	265	{}
	266	};
	267	MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id);
	268
	269	static struct i2c_driver ltc2990_i2c_driver = {
	270	.driver = {
	271	.name = "ltc2990",
	272	},
	273	.probe = ltc2990_i2c_probe,
	274	.id_table = ltc2990_i2c_id,
	275	};
	276
	277	module_i2c_driver(ltc2990_i2c_driver);
	278
	279	MODULE_DESCRIPTION("LTC2990 Sensor Driver");
	280	MODULE_AUTHOR("Topic Embedded Products");
	281	MODULE_LICENSE("GPL v2");