[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/mod_devicetable.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 = &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 = &vz89x_chips[VZ89X] },
	{ .compatible = "sgx,vz89te", .data = &vz89x_chips[VZ89TE] },
	{ }
};
MODULE_DEVICE_TABLE(of, vz89x_dt_ids);

static int vz89x_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct iio_dev *indio_dev;
	struct vz89x_data *data;

	indio_dev = devm_iio_device_alloc(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;

	data->chip = i2c_get_match_data(client);

	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	data->last_update = jiffies - HZ;
	mutex_init(&data->lock);

	indio_dev->info = &vz89x_info;
	indio_dev->name = dev_name(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(dev, indio_dev);
}

static const struct i2c_device_id vz89x_id[] = {
	{ "vz89x", (kernel_ulong_t)&vz89x_chips[VZ89X] },
	{ "vz89te", (kernel_ulong_t)&vz89x_chips[VZ89TE] },
	{ }
};
MODULE_DEVICE_TABLE(i2c, vz89x_id);

static struct i2c_driver vz89x_driver = {
	.driver = {
		.name	= "vz89x",
		.of_match_table = 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>
b3fce99a	13	#include <linux/mod_devicetable.h>
cd8d9777 MR	14
	15	#include <linux/iio/iio.h>
	16	#include <linux/iio/sysfs.h>
	17
	18	#define VZ89X_REG_MEASUREMENT 0x09
8376882f MR	19	#define VZ89X_REG_MEASUREMENT_RD_SIZE 6
8376882f MR	20	#define VZ89X_REG_MEASUREMENT_WR_SIZE 3
cd8d9777 MR	21
	22	#define VZ89X_VOC_CO2_IDX 0
	23	#define VZ89X_VOC_SHORT_IDX 1
	24	#define VZ89X_VOC_TVOC_IDX 2
	25	#define VZ89X_VOC_RESISTANCE_IDX 3
	26
0a735aa0 MR	27	#define VZ89TE_REG_MEASUREMENT 0x0c
	28	#define VZ89TE_REG_MEASUREMENT_RD_SIZE 7
	29	#define VZ89TE_REG_MEASUREMENT_WR_SIZE 6
	30
	31	#define VZ89TE_VOC_TVOC_IDX 0
	32	#define VZ89TE_VOC_CO2_IDX 1
	33	#define VZ89TE_VOC_RESISTANCE_IDX 2
	34
8376882f MR	35	enum {
8376882f MR	36	VZ89X,
0a735aa0	37	VZ89TE,
8376882f MR	38	};
	39
	40	struct vz89x_chip_data;
	41
cd8d9777 MR	42	struct vz89x_data {
cd8d9777 MR	43	struct i2c_client *client;
8376882f	44	const struct vz89x_chip_data *chip;
cd8d9777	45	struct mutex lock;
93e87d73	46	int (xfer)(struct vz89x_data data, u8 cmd);
cd8d9777	47
9d1894cd	48	bool is_valid;
93e87d73	49	unsigned long last_update;
0a735aa0	50	u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
8376882f MR	51	};
	52
	53	struct vz89x_chip_data {
	54	bool (valid)(struct vz89x_data data);
	55	const struct iio_chan_spec *channels;
	56	u8 num_channels;
	57
	58	u8 cmd;
	59	u8 read_size;
	60	u8 write_size;
cd8d9777 MR	61	};
	62
	63	static const struct iio_chan_spec vz89x_channels[] = {
	64	{
	65	.type = IIO_CONCENTRATION,
	66	.channel2 = IIO_MOD_CO2,
	67	.modified = 1,
	68	.info_mask_separate =
	69	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	70	.address = VZ89X_VOC_CO2_IDX,
	71	},
	72	{
	73	.type = IIO_CONCENTRATION,
	74	.channel2 = IIO_MOD_VOC,
	75	.modified = 1,
	76	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	77	.address = VZ89X_VOC_SHORT_IDX,
	78	.extend_name = "short",
	79	},
	80	{
	81	.type = IIO_CONCENTRATION,
	82	.channel2 = IIO_MOD_VOC,
	83	.modified = 1,
	84	.info_mask_separate =
	85	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	86	.address = VZ89X_VOC_TVOC_IDX,
	87	},
	88	{
	89	.type = IIO_RESISTANCE,
	90	.info_mask_separate =
	91	BIT(IIO_CHAN_INFO_RAW) \| BIT(IIO_CHAN_INFO_SCALE),
	92	.address = VZ89X_VOC_RESISTANCE_IDX,
0a735aa0 MR	93	.scan_index = -1,
	94	.scan_type = {
	95	.endianness = IIO_LE,
	96	},
	97	},
	98	};
	99
	100	static const struct iio_chan_spec vz89te_channels[] = {
	101	{
	102	.type = IIO_CONCENTRATION,
	103	.channel2 = IIO_MOD_VOC,
	104	.modified = 1,
	105	.info_mask_separate =
	106	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	107	.address = VZ89TE_VOC_TVOC_IDX,
	108	},
	109
	110	{
	111	.type = IIO_CONCENTRATION,
	112	.channel2 = IIO_MOD_CO2,
	113	.modified = 1,
	114	.info_mask_separate =
	115	BIT(IIO_CHAN_INFO_OFFSET) \| BIT(IIO_CHAN_INFO_RAW),
	116	.address = VZ89TE_VOC_CO2_IDX,
	117	},
	118	{
	119	.type = IIO_RESISTANCE,
	120	.info_mask_separate =
	121	BIT(IIO_CHAN_INFO_RAW) \| BIT(IIO_CHAN_INFO_SCALE),
	122	.address = VZ89TE_VOC_RESISTANCE_IDX,
	123	.scan_index = -1,
	124	.scan_type = {
	125	.endianness = IIO_BE,
	126	},
cd8d9777 MR	127	},
	128	};
	129
	130	static IIO_CONST_ATTR(in_concentration_co2_scale, "0.00000698689");
	131	static IIO_CONST_ATTR(in_concentration_voc_scale, "0.00000000436681223");
	132
	133	static struct attribute *vz89x_attributes[] = {
	134	&iio_const_attr_in_concentration_co2_scale.dev_attr.attr,
	135	&iio_const_attr_in_concentration_voc_scale.dev_attr.attr,
	136	NULL,
	137	};
	138
	139	static const struct attribute_group vz89x_attrs_group = {
	140	.attrs = vz89x_attributes,
	141	};
	142
bf23cee6 MR	143	/*
	144	* Chipset sometime updates in the middle of a reading causing it to reset the
	145	* data pointer, and causing invalid reading of previous data.
	146	* We can check for this by reading MSB of the resistance reading that is
	147	* always zero, and by also confirming the VOC_short isn't zero.
	148	*/
	149
8376882f	150	static bool vz89x_measurement_is_valid(struct vz89x_data *data)
bf23cee6 MR	151	{
bf23cee6 MR	152	if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0)
2535cc7a	153	return true;
bf23cee6	154
8376882f	155	return !!(data->buffer[data->chip->read_size - 1] > 0);
bf23cee6 MR	156	}
bf23cee6 MR	157
0a735aa0 MR	158	/* VZ89TE device has a modified CRC-8 two complement check */
	159	static bool vz89te_measurement_is_valid(struct vz89x_data *data)
	160	{
	161	u8 crc = 0;
	162	int i, sum = 0;
	163
	164	for (i = 0; i < (data->chip->read_size - 1); i++) {
	165	sum = crc + data->buffer[i];
	166	crc = sum;
	167	crc += sum / 256;
	168	}
	169
	170	return !((0xff - crc) == data->buffer[data->chip->read_size - 1]);
	171	}
	172
93e87d73	173	static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd)
cd8d9777	174	{
8376882f	175	const struct vz89x_chip_data *chip = data->chip;
93e87d73 MR	176	struct i2c_client *client = data->client;
93e87d73 MR	177	struct i2c_msg msg[2];
cd8d9777	178	int ret;
0a735aa0	179	u8 buf[6] = { cmd, 0, 0, 0, 0, 0xf3 };
cd8d9777	180
93e87d73 MR	181	msg[0].addr = client->addr;
93e87d73 MR	182	msg[0].flags = client->flags;
8376882f	183	msg[0].len = chip->write_size;
93e87d73 MR	184	msg[0].buf = (char *) &buf;
	185
	186	msg[1].addr = client->addr;
	187	msg[1].flags = client->flags \| I2C_M_RD;
8376882f	188	msg[1].len = chip->read_size;
93e87d73 MR	189	msg[1].buf = (char *) &data->buffer;
	190
	191	ret = i2c_transfer(client->adapter, msg, 2);
cd8d9777	192
93e87d73 MR	193	return (ret == 2) ? 0 : ret;
	194	}
	195
	196	static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd)
	197	{
	198	struct i2c_client *client = data->client;
	199	int ret;
	200	int i;
	201
	202	ret = i2c_smbus_write_word_data(client, cmd, 0);
cd8d9777 MR	203	if (ret < 0)
	204	return ret;
	205
8376882f	206	for (i = 0; i < data->chip->read_size; i++) {
93e87d73	207	ret = i2c_smbus_read_byte(client);
cd8d9777 MR	208	if (ret < 0)
	209	return ret;
	210	data->buffer[i] = ret;
	211	}
	212
93e87d73 MR	213	return 0;
	214	}
	215
	216	static int vz89x_get_measurement(struct vz89x_data *data)
	217	{
8376882f	218	const struct vz89x_chip_data *chip = data->chip;
93e87d73 MR	219	int ret;
	220
	221	/* sensor can only be polled once a second max per datasheet */
	222	if (!time_after(jiffies, data->last_update + HZ))
9d1894cd MR	223	return data->is_valid ? 0 : -EAGAIN;
	224
	225	data->is_valid = false;
	226	data->last_update = jiffies;
93e87d73	227
8376882f	228	ret = data->xfer(data, chip->cmd);
93e87d73 MR	229	if (ret < 0)
	230	return ret;
	231
8376882f	232	ret = chip->valid(data);
bf23cee6 MR	233	if (ret)
	234	return -EAGAIN;
	235
9d1894cd	236	data->is_valid = true;
cd8d9777 MR	237
	238	return 0;
	239	}
	240
0a735aa0 MR	241	static int vz89x_get_resistance_reading(struct vz89x_data *data,
	242	struct iio_chan_spec const *chan,
	243	int *val)
cd8d9777	244	{
79ca243d	245	u8 *tmp = &data->buffer[chan->address];
cd8d9777	246
0a735aa0 MR	247	switch (chan->scan_type.endianness) {
	248	case IIO_LE:
	249	val = le32_to_cpup((__le32 ) tmp) & GENMASK(23, 0);
	250	break;
	251	case IIO_BE:
	252	val = be32_to_cpup((__be32 ) tmp) >> 8;
	253	break;
	254	default:
	255	return -EINVAL;
	256	}
	257
	258	return 0;
cd8d9777 MR	259	}
	260
	261	static int vz89x_read_raw(struct iio_dev *indio_dev,
	262	struct iio_chan_spec const chan, int val,
	263	int *val2, long mask)
	264	{
	265	struct vz89x_data *data = iio_priv(indio_dev);
	266	int ret = -EINVAL;
	267
	268	switch (mask) {
	269	case IIO_CHAN_INFO_RAW:
	270	mutex_lock(&data->lock);
	271	ret = vz89x_get_measurement(data);
	272	mutex_unlock(&data->lock);
	273
	274	if (ret)
	275	return ret;
	276
0a735aa0 MR	277	switch (chan->type) {
0a735aa0 MR	278	case IIO_CONCENTRATION:
cd8d9777 MR	279	*val = data->buffer[chan->address];
cd8d9777 MR	280	return IIO_VAL_INT;
0a735aa0 MR	281	case IIO_RESISTANCE:
	282	ret = vz89x_get_resistance_reading(data, chan, val);
	283	if (!ret)
	284	return IIO_VAL_INT;
	285	break;
cd8d9777 MR	286	default:
	287	return -EINVAL;
	288	}
	289	break;
	290	case IIO_CHAN_INFO_SCALE:
	291	switch (chan->type) {
	292	case IIO_RESISTANCE:
	293	*val = 10;
	294	return IIO_VAL_INT;
	295	default:
	296	return -EINVAL;
	297	}
	298	break;
	299	case IIO_CHAN_INFO_OFFSET:
0a735aa0 MR	300	switch (chan->channel2) {
0a735aa0 MR	301	case IIO_MOD_CO2:
cd8d9777 MR	302	*val = 44;
	303	*val2 = 250000;
	304	return IIO_VAL_INT_PLUS_MICRO;
0a735aa0	305	case IIO_MOD_VOC:
cd8d9777 MR	306	*val = -13;
	307	return IIO_VAL_INT;
	308	default:
	309	return -EINVAL;
	310	}
	311	}
	312
	313	return ret;
	314	}
	315
	316	static const struct iio_info vz89x_info = {
	317	.attrs = &vz89x_attrs_group,
	318	.read_raw = vz89x_read_raw,
cd8d9777 MR	319	};
cd8d9777 MR	320
8376882f MR	321	static const struct vz89x_chip_data vz89x_chips[] = {
	322	{
	323	.valid = vz89x_measurement_is_valid,
	324
	325	.cmd = VZ89X_REG_MEASUREMENT,
	326	.read_size = VZ89X_REG_MEASUREMENT_RD_SIZE,
	327	.write_size = VZ89X_REG_MEASUREMENT_WR_SIZE,
	328
	329	.channels = vz89x_channels,
	330	.num_channels = ARRAY_SIZE(vz89x_channels),
	331	},
0a735aa0 MR	332	{
	333	.valid = vz89te_measurement_is_valid,
	334
	335	.cmd = VZ89TE_REG_MEASUREMENT,
	336	.read_size = VZ89TE_REG_MEASUREMENT_RD_SIZE,
	337	.write_size = VZ89TE_REG_MEASUREMENT_WR_SIZE,
	338
	339	.channels = vz89te_channels,
	340	.num_channels = ARRAY_SIZE(vz89te_channels),
	341	},
8376882f MR	342	};
	343
	344	static const struct of_device_id vz89x_dt_ids[] = {
2b0ddc83 BD	345	{ .compatible = "sgx,vz89x", .data = &vz89x_chips[VZ89X] },
2b0ddc83 BD	346	{ .compatible = "sgx,vz89te", .data = &vz89x_chips[VZ89TE] },
8376882f MR	347	{ }
	348	};
	349	MODULE_DEVICE_TABLE(of, vz89x_dt_ids);
	350
0d8535ee	351	static int vz89x_probe(struct i2c_client *client)
cd8d9777	352	{
e12b3a61	353	struct device *dev = &client->dev;
cd8d9777 MR	354	struct iio_dev *indio_dev;
	355	struct vz89x_data *data;
	356
e12b3a61	357	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
cd8d9777 MR	358	if (!indio_dev)
cd8d9777 MR	359	return -ENOMEM;
cd8d9777	360	data = iio_priv(indio_dev);
93e87d73 MR	361
	362	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
	363	data->xfer = vz89x_i2c_xfer;
	364	else if (i2c_check_functionality(client->adapter,
	365	I2C_FUNC_SMBUS_WORD_DATA \| I2C_FUNC_SMBUS_BYTE))
	366	data->xfer = vz89x_smbus_xfer;
	367	else
f8d9d3b4	368	return -EOPNOTSUPP;
93e87d73	369
2b0ddc83	370	data->chip = i2c_get_match_data(client);
8376882f	371
cd8d9777 MR	372	i2c_set_clientdata(client, indio_dev);
	373	data->client = client;
	374	data->last_update = jiffies - HZ;
	375	mutex_init(&data->lock);
	376
5e13b6f0	377	indio_dev->info = &vz89x_info;
e12b3a61	378	indio_dev->name = dev_name(dev);
cd8d9777 MR	379	indio_dev->modes = INDIO_DIRECT_MODE;
cd8d9777 MR	380
8376882f MR	381	indio_dev->channels = data->chip->channels;
8376882f MR	382	indio_dev->num_channels = data->chip->num_channels;
cd8d9777	383
e12b3a61	384	return devm_iio_device_register(dev, indio_dev);
cd8d9777 MR	385	}
	386
	387	static const struct i2c_device_id vz89x_id[] = {
2b0ddc83 BD	388	{ "vz89x", (kernel_ulong_t)&vz89x_chips[VZ89X] },
2b0ddc83 BD	389	{ "vz89te", (kernel_ulong_t)&vz89x_chips[VZ89TE] },
cd8d9777 MR	390	{ }
	391	};
	392	MODULE_DEVICE_TABLE(i2c, vz89x_id);
	393
cd8d9777 MR	394	static struct i2c_driver vz89x_driver = {
	395	.driver = {
	396	.name = "vz89x",
b3fce99a	397	.of_match_table = vz89x_dt_ids,
cd8d9777	398	},
7cf15f42	399	.probe = vz89x_probe,
cd8d9777 MR	400	.id_table = vz89x_id,
	401	};
	402	module_i2c_driver(vz89x_driver);
	403
d6ad8058	404	MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
cd8d9777 MR	405	MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
cd8d9777 MR	406	MODULE_LICENSE("GPL v2");