[linux-2.6-block.git] / drivers / iio / chemical / vz89x.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
 *
 * Copyright (C) 2015-2018
 * Author: Matt Ranostay <matt.ranostay@konsulko.com>
 */

#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define VZ89X_REG_MEASUREMENT		0x09
#define VZ89X_REG_MEASUREMENT_RD_SIZE	6
#define VZ89X_REG_MEASUREMENT_WR_SIZE	3

#define VZ89X_VOC_CO2_IDX		0
#define VZ89X_VOC_SHORT_IDX		1
#define VZ89X_VOC_TVOC_IDX		2
#define VZ89X_VOC_RESISTANCE_IDX	3

#define VZ89TE_REG_MEASUREMENT		0x0c
#define VZ89TE_REG_MEASUREMENT_RD_SIZE	7
#define VZ89TE_REG_MEASUREMENT_WR_SIZE	6

#define VZ89TE_VOC_TVOC_IDX		0
#define VZ89TE_VOC_CO2_IDX		1
#define VZ89TE_VOC_RESISTANCE_IDX	2

enum {
	VZ89X,
	VZ89TE,
};

struct vz89x_chip_data;

struct vz89x_data {
	struct i2c_client *client;
	const struct vz89x_chip_data *chip;
	struct mutex lock;
	int (*xfer)(struct vz89x_data *data, u8 cmd);

	bool is_valid;
	unsigned long last_update;
	u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
};

struct vz89x_chip_data {
	bool (*valid)(struct vz89x_data *data);
	const struct iio_chan_spec *channels;
	u8 num_channels;

	u8 cmd;
	u8 read_size;
	u8 write_size;
};

static const struct iio_chan_spec vz89x_channels[] = {
	{
		.type = IIO_CONCENTRATION,
		.channel2 = IIO_MOD_CO2,
		.modified = 1,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
		.address = VZ89X_VOC_CO2_IDX,
	},
	{
		.type = IIO_CONCENTRATION,
		.channel2 = IIO_MOD_VOC,
		.modified = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.address = VZ89X_VOC_SHORT_IDX,
		.extend_name = "short",
	},
	{
		.type = IIO_CONCENTRATION,
		.channel2 = IIO_MOD_VOC,
		.modified = 1,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
		.address = VZ89X_VOC_TVOC_IDX,
	},
	{
		.type = IIO_RESISTANCE,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
		.address = VZ89X_VOC_RESISTANCE_IDX,
		.scan_index = -1,
		.scan_type = {
			.endianness = IIO_LE,
		},
	},
};

static const struct iio_chan_spec vz89te_channels[] = {
	{
		.type = IIO_CONCENTRATION,
		.channel2 = IIO_MOD_VOC,
		.modified = 1,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
		.address = VZ89TE_VOC_TVOC_IDX,
	},

	{
		.type = IIO_CONCENTRATION,
		.channel2 = IIO_MOD_CO2,
		.modified = 1,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
		.address = VZ89TE_VOC_CO2_IDX,
	},
	{
		.type = IIO_RESISTANCE,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
		.address = VZ89TE_VOC_RESISTANCE_IDX,
		.scan_index = -1,
		.scan_type = {
			.endianness = IIO_BE,
		},
	},
};

static IIO_CONST_ATTR(in_concentration_co2_scale, "0.00000698689");
static IIO_CONST_ATTR(in_concentration_voc_scale, "0.00000000436681223");

static struct attribute *vz89x_attributes[] = {
	&iio_const_attr_in_concentration_co2_scale.dev_attr.attr,
	&iio_const_attr_in_concentration_voc_scale.dev_attr.attr,
	NULL,
};

static const struct attribute_group vz89x_attrs_group = {
	.attrs = vz89x_attributes,
};

/*
 * Chipset sometime updates in the middle of a reading causing it to reset the
 * data pointer, and causing invalid reading of previous data.
 * We can check for this by reading MSB of the resistance reading that is
 * always zero, and by also confirming the VOC_short isn't zero.
 */

static bool vz89x_measurement_is_valid(struct vz89x_data *data)
{
	if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0)
		return true;

	return !!(data->buffer[data->chip->read_size - 1] > 0);
}

/* VZ89TE device has a modified CRC-8 two complement check */
static bool vz89te_measurement_is_valid(struct vz89x_data *data)
{
	u8 crc = 0;
	int i, sum = 0;

	for (i = 0; i < (data->chip->read_size - 1); i++) {
		sum = crc + data->buffer[i];
		crc = sum;
		crc += sum / 256;
	}

	return !((0xff - crc) == data->buffer[data->chip->read_size - 1]);
}

static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd)
{
	const struct vz89x_chip_data *chip = data->chip;
	struct i2c_client *client = data->client;
	struct i2c_msg msg[2];
	int ret;
	u8 buf[6] = { cmd, 0, 0, 0, 0, 0xf3 };

	msg[0].addr = client->addr;
	msg[0].flags = client->flags;
	msg[0].len = chip->write_size;
	msg[0].buf  = (char *) &buf;

	msg[1].addr = client->addr;
	msg[1].flags = client->flags | I2C_M_RD;
	msg[1].len = chip->read_size;
	msg[1].buf = (char *) &data->buffer;

	ret = i2c_transfer(client->adapter, msg, 2);

	return (ret == 2) ? 0 : ret;
}

static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd)
{
	struct i2c_client *client = data->client;
	int ret;
	int i;

	ret = i2c_smbus_write_word_data(client, cmd, 0);
	if (ret < 0)
		return ret;

	for (i = 0; i < data->chip->read_size; i++) {
		ret = i2c_smbus_read_byte(client);
		if (ret < 0)
			return ret;
		data->buffer[i] = ret;
	}

	return 0;
}

static int vz89x_get_measurement(struct vz89x_data *data)
{
	const struct vz89x_chip_data *chip = data->chip;
	int ret;

	/* sensor can only be polled once a second max per datasheet */
	if (!time_after(jiffies, data->last_update + HZ))
		return data->is_valid ? 0 : -EAGAIN;

	data->is_valid = false;
	data->last_update = jiffies;

	ret = data->xfer(data, chip->cmd);
	if (ret < 0)
		return ret;

	ret = chip->valid(data);
	if (ret)
		return -EAGAIN;

	data->is_valid = true;

	return 0;
}

static int vz89x_get_resistance_reading(struct vz89x_data *data,
					struct iio_chan_spec const *chan,
					int *val)
{
	u8 *tmp = (u8 *) &data->buffer[chan->address];

	switch (chan->scan_type.endianness) {
	case IIO_LE:
		*val = le32_to_cpup((__le32 *) tmp) & GENMASK(23, 0);
		break;
	case IIO_BE:
		*val = be32_to_cpup((__be32 *) tmp) >> 8;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int vz89x_read_raw(struct iio_dev *indio_dev,
			  struct iio_chan_spec const *chan, int *val,
			  int *val2, long mask)
{
	struct vz89x_data *data = iio_priv(indio_dev);
	int ret = -EINVAL;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&data->lock);
		ret = vz89x_get_measurement(data);
		mutex_unlock(&data->lock);

		if (ret)
			return ret;

		switch (chan->type) {
		case IIO_CONCENTRATION:
			*val = data->buffer[chan->address];
			return IIO_VAL_INT;
		case IIO_RESISTANCE:
			ret = vz89x_get_resistance_reading(data, chan, val);
			if (!ret)
				return IIO_VAL_INT;
			break;
		default:
			return -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_RESISTANCE:
			*val = 10;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_OFFSET:
		switch (chan->channel2) {
		case IIO_MOD_CO2:
			*val = 44;
			*val2 = 250000;
			return IIO_VAL_INT_PLUS_MICRO;
		case IIO_MOD_VOC:
			*val = -13;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	}

	return ret;
}

static const struct iio_info vz89x_info = {
	.attrs		= &vz89x_attrs_group,
	.read_raw	= vz89x_read_raw,
};

static const struct vz89x_chip_data vz89x_chips[] = {
	{
		.valid = vz89x_measurement_is_valid,

		.cmd = VZ89X_REG_MEASUREMENT,
		.read_size = VZ89X_REG_MEASUREMENT_RD_SIZE,
		.write_size = VZ89X_REG_MEASUREMENT_WR_SIZE,

		.channels = vz89x_channels,
		.num_channels = ARRAY_SIZE(vz89x_channels),
	},
	{
		.valid = vz89te_measurement_is_valid,

		.cmd = VZ89TE_REG_MEASUREMENT,
		.read_size = VZ89TE_REG_MEASUREMENT_RD_SIZE,
		.write_size = VZ89TE_REG_MEASUREMENT_WR_SIZE,

		.channels = vz89te_channels,
		.num_channels = ARRAY_SIZE(vz89te_channels),
	},
};

static const struct of_device_id vz89x_dt_ids[] = {
	{ .compatible = "sgx,vz89x", .data = (void *) VZ89X },
	{ .compatible = "sgx,vz89te", .data = (void *) VZ89TE },
	{ }
};
MODULE_DEVICE_TABLE(of, vz89x_dt_ids);

static int vz89x_probe(struct i2c_client *client,
		       const struct i2c_device_id *id)
{
	struct iio_dev *indio_dev;
	struct vz89x_data *data;
	const struct of_device_id *of_id;
	int chip_id;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;
	data = iio_priv(indio_dev);

	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
		data->xfer = vz89x_i2c_xfer;
	else if (i2c_check_functionality(client->adapter,
				I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE))
		data->xfer = vz89x_smbus_xfer;
	else
		return -EOPNOTSUPP;

	of_id = of_match_device(vz89x_dt_ids, &client->dev);
	if (!of_id)
		chip_id = id->driver_data;
	else
		chip_id = (unsigned long)of_id->data;

	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	data->chip = &vz89x_chips[chip_id];
	data->last_update = jiffies - HZ;
	mutex_init(&data->lock);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &vz89x_info;
	indio_dev->name = dev_name(&client->dev);
	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = data->chip->channels;
	indio_dev->num_channels = data->chip->num_channels;

	return devm_iio_device_register(&client->dev, indio_dev);
}

static const struct i2c_device_id vz89x_id[] = {
	{ "vz89x", VZ89X },
	{ "vz89te", VZ89TE },
	{ }
};
MODULE_DEVICE_TABLE(i2c, vz89x_id);

static struct i2c_driver vz89x_driver = {
	.driver = {
		.name	= "vz89x",
		.of_match_table = of_match_ptr(vz89x_dt_ids),
	},
	.probe = vz89x_probe,
	.id_table = vz89x_id,
};
module_i2c_driver(vz89x_driver);

MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d6ad8058	1	// SPDX-License-Identifier: GPL-2.0+
cd8d9777 MR	2	/*
	3	* vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
	4	*
d6ad8058 MR	5	* Copyright (C) 2015-2018
d6ad8058 MR	6	* Author: Matt Ranostay <matt.ranostay@konsulko.com>
cd8d9777 MR	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/mutex.h>
	11	#include <linux/init.h>
	12	#include <linux/i2c.h>
8376882f MR	13	#include <linux/of.h>
8376882f MR	14	#include <linux/of_device.h>
cd8d9777 MR	15
	16	#include <linux/iio/iio.h>
	17	#include <linux/iio/sysfs.h>
	18
	19	#define VZ89X_REG_MEASUREMENT 0x09
8376882f MR	20	#define VZ89X_REG_MEASUREMENT_RD_SIZE 6
8376882f MR	21	#define VZ89X_REG_MEASUREMENT_WR_SIZE 3
cd8d9777 MR	22
	23	#define VZ89X_VOC_CO2_IDX 0
	24	#define VZ89X_VOC_SHORT_IDX 1
	25	#define VZ89X_VOC_TVOC_IDX 2
	26	#define VZ89X_VOC_RESISTANCE_IDX 3
	27
0a735aa0 MR	28	#define VZ89TE_REG_MEASUREMENT 0x0c
	29	#define VZ89TE_REG_MEASUREMENT_RD_SIZE 7
	30	#define VZ89TE_REG_MEASUREMENT_WR_SIZE 6
	31
	32	#define VZ89TE_VOC_TVOC_IDX 0
	33	#define VZ89TE_VOC_CO2_IDX 1
	34	#define VZ89TE_VOC_RESISTANCE_IDX 2
	35
8376882f MR	36	enum {
8376882f MR	37	VZ89X,
0a735aa0	38	VZ89TE,
8376882f MR	39	};
	40
	41	struct vz89x_chip_data;
	42
cd8d9777 MR	43	struct vz89x_data {
cd8d9777 MR	44	struct i2c_client *client;
8376882f	45	const struct vz89x_chip_data *chip;
cd8d9777	46	struct mutex lock;
93e87d73	47	int (xfer)(struct vz89x_data data, u8 cmd);
cd8d9777	48
9d1894cd	49	bool is_valid;
93e87d73	50	unsigned long last_update;
0a735aa0	51	u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
8376882f MR	52	};
	53
	54	struct vz89x_chip_data {
	55	bool (valid)(struct vz89x_data data);
	56	const struct iio_chan_spec *channels;
	57	u8 num_channels;
	58
	59	u8 cmd;
	60	u8 read_size;
	61	u8 write_size;
cd8d9777 MR	62	};
	63
	64	static const struct iio_chan_spec vz89x_channels[] = {
	65	{
	66	.type = IIO_CONCENTRATION,
	67	.channel2 = IIO_MOD_CO2,
	68	.modified = 1,
	69	.info_mask_separate =
	70	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	71	.address = VZ89X_VOC_CO2_IDX,
	72	},
	73	{
	74	.type = IIO_CONCENTRATION,
	75	.channel2 = IIO_MOD_VOC,
	76	.modified = 1,
	77	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	78	.address = VZ89X_VOC_SHORT_IDX,
	79	.extend_name = "short",
	80	},
	81	{
	82	.type = IIO_CONCENTRATION,
	83	.channel2 = IIO_MOD_VOC,
	84	.modified = 1,
	85	.info_mask_separate =
	86	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	87	.address = VZ89X_VOC_TVOC_IDX,
	88	},
	89	{
	90	.type = IIO_RESISTANCE,
	91	.info_mask_separate =
	92	BIT(IIO_CHAN_INFO_RAW) \| BIT(IIO_CHAN_INFO_SCALE),
	93	.address = VZ89X_VOC_RESISTANCE_IDX,
0a735aa0 MR	94	.scan_index = -1,
	95	.scan_type = {
	96	.endianness = IIO_LE,
	97	},
	98	},
	99	};
	100
	101	static const struct iio_chan_spec vz89te_channels[] = {
	102	{
	103	.type = IIO_CONCENTRATION,
	104	.channel2 = IIO_MOD_VOC,
	105	.modified = 1,
	106	.info_mask_separate =
	107	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	108	.address = VZ89TE_VOC_TVOC_IDX,
	109	},
	110
	111	{
	112	.type = IIO_CONCENTRATION,
	113	.channel2 = IIO_MOD_CO2,
	114	.modified = 1,
	115	.info_mask_separate =
	116	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	117	.address = VZ89TE_VOC_CO2_IDX,
	118	},
	119	{
	120	.type = IIO_RESISTANCE,
	121	.info_mask_separate =
	122	BIT(IIO_CHAN_INFO_RAW) \| BIT(IIO_CHAN_INFO_SCALE),
	123	.address = VZ89TE_VOC_RESISTANCE_IDX,
	124	.scan_index = -1,
	125	.scan_type = {
	126	.endianness = IIO_BE,
	127	},
cd8d9777 MR	128	},
	129	};
	130
	131	static IIO_CONST_ATTR(in_concentration_co2_scale, "0.00000698689");
	132	static IIO_CONST_ATTR(in_concentration_voc_scale, "0.00000000436681223");
	133
	134	static struct attribute *vz89x_attributes[] = {
	135	&iio_const_attr_in_concentration_co2_scale.dev_attr.attr,
	136	&iio_const_attr_in_concentration_voc_scale.dev_attr.attr,
	137	NULL,
	138	};
	139
	140	static const struct attribute_group vz89x_attrs_group = {
	141	.attrs = vz89x_attributes,
	142	};
	143
bf23cee6 MR	144	/*
	145	* Chipset sometime updates in the middle of a reading causing it to reset the
	146	* data pointer, and causing invalid reading of previous data.
	147	* We can check for this by reading MSB of the resistance reading that is
	148	* always zero, and by also confirming the VOC_short isn't zero.
	149	*/
	150
8376882f	151	static bool vz89x_measurement_is_valid(struct vz89x_data *data)
bf23cee6 MR	152	{
bf23cee6 MR	153	if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0)
2535cc7a	154	return true;
bf23cee6	155
8376882f	156	return !!(data->buffer[data->chip->read_size - 1] > 0);
bf23cee6 MR	157	}
bf23cee6 MR	158
0a735aa0 MR	159	/* VZ89TE device has a modified CRC-8 two complement check */
	160	static bool vz89te_measurement_is_valid(struct vz89x_data *data)
	161	{
	162	u8 crc = 0;
	163	int i, sum = 0;
	164
	165	for (i = 0; i < (data->chip->read_size - 1); i++) {
	166	sum = crc + data->buffer[i];
	167	crc = sum;
	168	crc += sum / 256;
	169	}
	170
	171	return !((0xff - crc) == data->buffer[data->chip->read_size - 1]);
	172	}
	173
93e87d73	174	static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd)
cd8d9777	175	{
8376882f	176	const struct vz89x_chip_data *chip = data->chip;
93e87d73 MR	177	struct i2c_client *client = data->client;
93e87d73 MR	178	struct i2c_msg msg[2];
cd8d9777	179	int ret;
0a735aa0	180	u8 buf[6] = { cmd, 0, 0, 0, 0, 0xf3 };
cd8d9777	181
93e87d73 MR	182	msg[0].addr = client->addr;
93e87d73 MR	183	msg[0].flags = client->flags;
8376882f	184	msg[0].len = chip->write_size;
93e87d73 MR	185	msg[0].buf = (char *) &buf;
	186
	187	msg[1].addr = client->addr;
	188	msg[1].flags = client->flags \| I2C_M_RD;
8376882f	189	msg[1].len = chip->read_size;
93e87d73 MR	190	msg[1].buf = (char *) &data->buffer;
	191
	192	ret = i2c_transfer(client->adapter, msg, 2);
cd8d9777	193
93e87d73 MR	194	return (ret == 2) ? 0 : ret;
	195	}
	196
	197	static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd)
	198	{
	199	struct i2c_client *client = data->client;
	200	int ret;
	201	int i;
	202
	203	ret = i2c_smbus_write_word_data(client, cmd, 0);
cd8d9777 MR	204	if (ret < 0)
	205	return ret;
	206
8376882f	207	for (i = 0; i < data->chip->read_size; i++) {
93e87d73	208	ret = i2c_smbus_read_byte(client);
cd8d9777 MR	209	if (ret < 0)
	210	return ret;
	211	data->buffer[i] = ret;
	212	}
	213
93e87d73 MR	214	return 0;
	215	}
	216
	217	static int vz89x_get_measurement(struct vz89x_data *data)
	218	{
8376882f	219	const struct vz89x_chip_data *chip = data->chip;
93e87d73 MR	220	int ret;
	221
	222	/* sensor can only be polled once a second max per datasheet */
	223	if (!time_after(jiffies, data->last_update + HZ))
9d1894cd MR	224	return data->is_valid ? 0 : -EAGAIN;
	225
	226	data->is_valid = false;
	227	data->last_update = jiffies;
93e87d73	228
8376882f	229	ret = data->xfer(data, chip->cmd);
93e87d73 MR	230	if (ret < 0)
	231	return ret;
	232
8376882f	233	ret = chip->valid(data);
bf23cee6 MR	234	if (ret)
	235	return -EAGAIN;
	236
9d1894cd	237	data->is_valid = true;
cd8d9777 MR	238
	239	return 0;
	240	}
	241
0a735aa0 MR	242	static int vz89x_get_resistance_reading(struct vz89x_data *data,
	243	struct iio_chan_spec const *chan,
	244	int *val)
cd8d9777	245	{
0a735aa0	246	u8 tmp = (u8 ) &data->buffer[chan->address];
cd8d9777	247
0a735aa0 MR	248	switch (chan->scan_type.endianness) {
	249	case IIO_LE:
	250	val = le32_to_cpup((__le32 ) tmp) & GENMASK(23, 0);
	251	break;
	252	case IIO_BE:
	253	val = be32_to_cpup((__be32 ) tmp) >> 8;
	254	break;
	255	default:
	256	return -EINVAL;
	257	}
	258
	259	return 0;
cd8d9777 MR	260	}
	261
	262	static int vz89x_read_raw(struct iio_dev *indio_dev,
	263	struct iio_chan_spec const chan, int val,
	264	int *val2, long mask)
	265	{
	266	struct vz89x_data *data = iio_priv(indio_dev);
	267	int ret = -EINVAL;
	268
	269	switch (mask) {
	270	case IIO_CHAN_INFO_RAW:
	271	mutex_lock(&data->lock);
	272	ret = vz89x_get_measurement(data);
	273	mutex_unlock(&data->lock);
	274
	275	if (ret)
	276	return ret;
	277
0a735aa0 MR	278	switch (chan->type) {
0a735aa0 MR	279	case IIO_CONCENTRATION:
cd8d9777 MR	280	*val = data->buffer[chan->address];
cd8d9777 MR	281	return IIO_VAL_INT;
0a735aa0 MR	282	case IIO_RESISTANCE:
	283	ret = vz89x_get_resistance_reading(data, chan, val);
	284	if (!ret)
	285	return IIO_VAL_INT;
	286	break;
cd8d9777 MR	287	default:
	288	return -EINVAL;
	289	}
	290	break;
	291	case IIO_CHAN_INFO_SCALE:
	292	switch (chan->type) {
	293	case IIO_RESISTANCE:
	294	*val = 10;
	295	return IIO_VAL_INT;
	296	default:
	297	return -EINVAL;
	298	}
	299	break;
	300	case IIO_CHAN_INFO_OFFSET:
0a735aa0 MR	301	switch (chan->channel2) {
0a735aa0 MR	302	case IIO_MOD_CO2:
cd8d9777 MR	303	*val = 44;
	304	*val2 = 250000;
	305	return IIO_VAL_INT_PLUS_MICRO;
0a735aa0	306	case IIO_MOD_VOC:
cd8d9777 MR	307	*val = -13;
	308	return IIO_VAL_INT;
	309	default:
	310	return -EINVAL;
	311	}
	312	}
	313
	314	return ret;
	315	}
	316
	317	static const struct iio_info vz89x_info = {
	318	.attrs = &vz89x_attrs_group,
	319	.read_raw = vz89x_read_raw,
cd8d9777 MR	320	};
cd8d9777 MR	321
8376882f MR	322	static const struct vz89x_chip_data vz89x_chips[] = {
	323	{
	324	.valid = vz89x_measurement_is_valid,
	325
	326	.cmd = VZ89X_REG_MEASUREMENT,
	327	.read_size = VZ89X_REG_MEASUREMENT_RD_SIZE,
	328	.write_size = VZ89X_REG_MEASUREMENT_WR_SIZE,
	329
	330	.channels = vz89x_channels,
	331	.num_channels = ARRAY_SIZE(vz89x_channels),
	332	},
0a735aa0 MR	333	{
	334	.valid = vz89te_measurement_is_valid,
	335
	336	.cmd = VZ89TE_REG_MEASUREMENT,
	337	.read_size = VZ89TE_REG_MEASUREMENT_RD_SIZE,
	338	.write_size = VZ89TE_REG_MEASUREMENT_WR_SIZE,
	339
	340	.channels = vz89te_channels,
	341	.num_channels = ARRAY_SIZE(vz89te_channels),
	342	},
8376882f MR	343	};
	344
	345	static const struct of_device_id vz89x_dt_ids[] = {
	346	{ .compatible = "sgx,vz89x", .data = (void *) VZ89X },
0a735aa0	347	{ .compatible = "sgx,vz89te", .data = (void *) VZ89TE },
8376882f MR	348	{ }
	349	};
	350	MODULE_DEVICE_TABLE(of, vz89x_dt_ids);
	351
cd8d9777 MR	352	static int vz89x_probe(struct i2c_client *client,
	353	const struct i2c_device_id *id)
	354	{
	355	struct iio_dev *indio_dev;
	356	struct vz89x_data *data;
8376882f MR	357	const struct of_device_id *of_id;
8376882f MR	358	int chip_id;
cd8d9777	359
cd8d9777 MR	360	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	361	if (!indio_dev)
	362	return -ENOMEM;
cd8d9777	363	data = iio_priv(indio_dev);
93e87d73 MR	364
	365	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
	366	data->xfer = vz89x_i2c_xfer;
	367	else if (i2c_check_functionality(client->adapter,
	368	I2C_FUNC_SMBUS_WORD_DATA \| I2C_FUNC_SMBUS_BYTE))
	369	data->xfer = vz89x_smbus_xfer;
	370	else
f8d9d3b4	371	return -EOPNOTSUPP;
93e87d73	372
8376882f MR	373	of_id = of_match_device(vz89x_dt_ids, &client->dev);
	374	if (!of_id)
	375	chip_id = id->driver_data;
	376	else
	377	chip_id = (unsigned long)of_id->data;
	378
cd8d9777 MR	379	i2c_set_clientdata(client, indio_dev);
cd8d9777 MR	380	data->client = client;
8376882f	381	data->chip = &vz89x_chips[chip_id];
cd8d9777 MR	382	data->last_update = jiffies - HZ;
	383	mutex_init(&data->lock);
	384
	385	indio_dev->dev.parent = &client->dev;
5e13b6f0	386	indio_dev->info = &vz89x_info;
cd8d9777 MR	387	indio_dev->name = dev_name(&client->dev);
	388	indio_dev->modes = INDIO_DIRECT_MODE;
	389
8376882f MR	390	indio_dev->channels = data->chip->channels;
8376882f MR	391	indio_dev->num_channels = data->chip->num_channels;
cd8d9777 MR	392
	393	return devm_iio_device_register(&client->dev, indio_dev);
	394	}
	395
	396	static const struct i2c_device_id vz89x_id[] = {
8376882f	397	{ "vz89x", VZ89X },
0a735aa0	398	{ "vz89te", VZ89TE },
cd8d9777 MR	399	{ }
	400	};
	401	MODULE_DEVICE_TABLE(i2c, vz89x_id);
	402
cd8d9777 MR	403	static struct i2c_driver vz89x_driver = {
	404	.driver = {
	405	.name = "vz89x",
	406	.of_match_table = of_match_ptr(vz89x_dt_ids),
	407	},
	408	.probe = vz89x_probe,
	409	.id_table = vz89x_id,
	410	};
	411	module_i2c_driver(vz89x_driver);
	412
d6ad8058	413	MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
cd8d9777 MR	414	MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
cd8d9777 MR	415	MODULE_LICENSE("GPL v2");