[deliverable/linux.git] / drivers / iio / light / cm32181.c

/*
 * Copyright (C) 2013 Capella Microsystems Inc.
 * Author: Kevin Tsai <ktsai@capellamicro.com>
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/init.h>

/* Registers Address */
#define CM32181_REG_ADDR_CMD		0x00
#define CM32181_REG_ADDR_ALS		0x04
#define CM32181_REG_ADDR_STATUS		0x06
#define CM32181_REG_ADDR_ID		0x07

/* Number of Configurable Registers */
#define CM32181_CONF_REG_NUM		0x01

/* CMD register */
#define CM32181_CMD_ALS_ENABLE		0x00
#define CM32181_CMD_ALS_DISABLE		0x01
#define CM32181_CMD_ALS_INT_EN		0x02

#define CM32181_CMD_ALS_IT_SHIFT	6
#define CM32181_CMD_ALS_IT_MASK		(0x0F << CM32181_CMD_ALS_IT_SHIFT)
#define CM32181_CMD_ALS_IT_DEFAULT	(0x00 << CM32181_CMD_ALS_IT_SHIFT)

#define CM32181_CMD_ALS_SM_SHIFT	11
#define CM32181_CMD_ALS_SM_MASK		(0x03 << CM32181_CMD_ALS_SM_SHIFT)
#define CM32181_CMD_ALS_SM_DEFAULT	(0x01 << CM32181_CMD_ALS_SM_SHIFT)

#define CM32181_MLUX_PER_BIT		5	/* ALS_SM=01 IT=800ms */
#define CM32181_MLUX_PER_BIT_BASE_IT	800000	/* Based on IT=800ms */
#define	CM32181_CALIBSCALE_DEFAULT	1000
#define CM32181_CALIBSCALE_RESOLUTION	1000
#define MLUX_PER_LUX			1000

static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
	CM32181_REG_ADDR_CMD,
};

static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
	800000};

struct cm32181_chip {
	struct i2c_client *client;
	struct mutex lock;
	u16 conf_regs[CM32181_CONF_REG_NUM];
	int calibscale;
};

/**
 * cm32181_reg_init() - Initialize CM32181 registers
 * @cm32181:	pointer of struct cm32181.
 *
 * Initialize CM32181 ambient light sensor register to default values.
 *
 * Return: 0 for success; otherwise for error code.
 */
static int cm32181_reg_init(struct cm32181_chip *cm32181)
{
	struct i2c_client *client = cm32181->client;
	int i;
	s32 ret;

	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
	if (ret < 0)
		return ret;

	/* check device ID */
	if ((ret & 0xFF) != 0x81)
		return -ENODEV;

	/* Default Values */
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE |
			CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;

	/* Initialize registers*/
	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
		ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
			cm32181->conf_regs[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

/**
 *  cm32181_read_als_it() - Get sensor integration time (ms)
 *  @cm32181:	pointer of struct cm32181
 *  @val2:	pointer of int to load the als_it value.
 *
 *  Report the current integartion time by millisecond.
 *
 *  Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
 */
static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2)
{
	u16 als_it;
	int i;

	als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
	als_it &= CM32181_CMD_ALS_IT_MASK;
	als_it >>= CM32181_CMD_ALS_IT_SHIFT;
	for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
		if (als_it == als_it_bits[i]) {
			*val2 = als_it_value[i];
			return IIO_VAL_INT_PLUS_MICRO;
		}
	}

	return -EINVAL;
}

/**
 * cm32181_write_als_it() - Write sensor integration time
 * @cm32181:	pointer of struct cm32181.
 * @val:	integration time by millisecond.
 *
 * Convert integration time (ms) to sensor value.
 *
 * Return: i2c_smbus_write_word_data command return value.
 */
static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
{
	struct i2c_client *client = cm32181->client;
	u16 als_it;
	int ret, i, n;

	n = ARRAY_SIZE(als_it_value);
	for (i = 0; i < n; i++)
		if (val <= als_it_value[i])
			break;
	if (i >= n)
		i = n - 1;

	als_it = als_it_bits[i];
	als_it <<= CM32181_CMD_ALS_IT_SHIFT;

	mutex_lock(&cm32181->lock);
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
		~CM32181_CMD_ALS_IT_MASK;
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] |=
		als_it;
	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
			cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
	mutex_unlock(&cm32181->lock);

	return ret;
}

/**
 * cm32181_get_lux() - report current lux value
 * @cm32181:	pointer of struct cm32181.
 *
 * Convert sensor raw data to lux.  It depends on integration
 * time and calibscale variable.
 *
 * Return: Positive value is lux, otherwise is error code.
 */
static int cm32181_get_lux(struct cm32181_chip *cm32181)
{
	struct i2c_client *client = cm32181->client;
	int ret;
	int als_it;
	unsigned long lux;

	ret = cm32181_read_als_it(cm32181, &als_it);
	if (ret < 0)
		return -EINVAL;

	lux = CM32181_MLUX_PER_BIT;
	lux *= CM32181_MLUX_PER_BIT_BASE_IT;
	lux /= als_it;

	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
	if (ret < 0)
		return ret;

	lux *= ret;
	lux *= cm32181->calibscale;
	lux /= CM32181_CALIBSCALE_RESOLUTION;
	lux /= MLUX_PER_LUX;

	if (lux > 0xFFFF)
		lux = 0xFFFF;

	return lux;
}

static int cm32181_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
		ret = cm32181_get_lux(cm32181);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBSCALE:
		*val = cm32181->calibscale;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		ret = cm32181_read_als_it(cm32181, val2);
		return ret;
	}

	return -EINVAL;
}

static int cm32181_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_CALIBSCALE:
		cm32181->calibscale = val;
		return val;
	case IIO_CHAN_INFO_INT_TIME:
		ret = cm32181_write_als_it(cm32181, val2);
		return ret;
	}

	return -EINVAL;
}

/**
 * cm32181_get_it_available() - Get available ALS IT value
 * @dev:	pointer of struct device.
 * @attr:	pointer of struct device_attribute.
 * @buf:	pointer of return string buffer.
 *
 * Display the available integration time values by millisecond.
 *
 * Return: string length.
 */
static ssize_t cm32181_get_it_available(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int i, n, len;

	n = ARRAY_SIZE(als_it_value);
	for (i = 0, len = 0; i < n; i++)
		len += sprintf(buf + len, "0.%06u ", als_it_value[i]);
	return len + sprintf(buf + len, "\n");
}

static const struct iio_chan_spec cm32181_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_PROCESSED) |
			BIT(IIO_CHAN_INFO_CALIBSCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME),
	}
};

static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
			S_IRUGO, cm32181_get_it_available, NULL, 0);

static struct attribute *cm32181_attributes[] = {
	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group cm32181_attribute_group = {
	.attrs = cm32181_attributes
};

static const struct iio_info cm32181_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= &cm32181_read_raw,
	.write_raw		= &cm32181_write_raw,
	.attrs			= &cm32181_attribute_group,
};

static int cm32181_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct cm32181_chip *cm32181;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
	if (!indio_dev) {
		dev_err(&client->dev, "devm_iio_device_alloc failed\n");
		return -ENOMEM;
	}

	cm32181 = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	cm32181->client = client;

	mutex_init(&cm32181->lock);
	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = cm32181_channels;
	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
	indio_dev->info = &cm32181_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = cm32181_reg_init(cm32181);
	if (ret) {
		dev_err(&client->dev,
			"%s: register init failed\n",
			__func__);
		return ret;
	}

	ret = devm_iio_device_register(&client->dev, indio_dev);
	if (ret) {
		dev_err(&client->dev,
			"%s: regist device failed\n",
			__func__);
		return ret;
	}

	return 0;
}

static const struct i2c_device_id cm32181_id[] = {
	{ "cm32181", 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, cm32181_id);

static const struct of_device_id cm32181_of_match[] = {
	{ .compatible = "capella,cm32181" },
	{ }
};
MODULE_DEVICE_TABLE(of, cm32181_of_match);

static struct i2c_driver cm32181_driver = {
	.driver = {
		.name	= "cm32181",
		.of_match_table = of_match_ptr(cm32181_of_match),
	},
	.id_table       = cm32181_id,
	.probe		= cm32181_probe,
};

module_i2c_driver(cm32181_driver);

MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
971672c0 KT	1	/*
	2	* Copyright (C) 2013 Capella Microsystems Inc.
	3	* Author: Kevin Tsai <ktsai@capellamicro.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2, as published
	7	* by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/delay.h>
	11	#include <linux/err.h>
	12	#include <linux/i2c.h>
	13	#include <linux/mutex.h>
	14	#include <linux/module.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/regulator/consumer.h>
	17	#include <linux/iio/iio.h>
	18	#include <linux/iio/sysfs.h>
	19	#include <linux/iio/events.h>
	20	#include <linux/init.h>
	21
	22	/* Registers Address */
	23	#define CM32181_REG_ADDR_CMD 0x00
	24	#define CM32181_REG_ADDR_ALS 0x04
	25	#define CM32181_REG_ADDR_STATUS 0x06
	26	#define CM32181_REG_ADDR_ID 0x07
	27
	28	/* Number of Configurable Registers */
	29	#define CM32181_CONF_REG_NUM 0x01
	30
	31	/* CMD register */
	32	#define CM32181_CMD_ALS_ENABLE 0x00
	33	#define CM32181_CMD_ALS_DISABLE 0x01
	34	#define CM32181_CMD_ALS_INT_EN 0x02
	35
	36	#define CM32181_CMD_ALS_IT_SHIFT 6
	37	#define CM32181_CMD_ALS_IT_MASK (0x0F << CM32181_CMD_ALS_IT_SHIFT)
	38	#define CM32181_CMD_ALS_IT_DEFAULT (0x00 << CM32181_CMD_ALS_IT_SHIFT)
	39
	40	#define CM32181_CMD_ALS_SM_SHIFT 11
	41	#define CM32181_CMD_ALS_SM_MASK (0x03 << CM32181_CMD_ALS_SM_SHIFT)
	42	#define CM32181_CMD_ALS_SM_DEFAULT (0x01 << CM32181_CMD_ALS_SM_SHIFT)
	43
	44	#define CM32181_MLUX_PER_BIT 5 /* ALS_SM=01 IT=800ms */
	45	#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
	46	#define CM32181_CALIBSCALE_DEFAULT 1000
	47	#define CM32181_CALIBSCALE_RESOLUTION 1000
	48	#define MLUX_PER_LUX 1000
	49
	50	static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
	51	CM32181_REG_ADDR_CMD,
	52	};
	53
	54	static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
	55	static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
	56	800000};
	57
	58	struct cm32181_chip {
	59	struct i2c_client *client;
	60	struct mutex lock;
	61	u16 conf_regs[CM32181_CONF_REG_NUM];
	62	int calibscale;
	63	};
	64
65	/**
66	* cm32181_reg_init() - Initialize CM32181 registers
67	* @cm32181: pointer of struct cm32181.
68	*
69	* Initialize CM32181 ambient light sensor register to default values.
70	*
71	* Return: 0 for success; otherwise for error code.
72	*/
73	static int cm32181_reg_init(struct cm32181_chip *cm32181)
74	{
75	struct i2c_client *client = cm32181->client;
76	int i;
77	s32 ret;
78
79	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
80	if (ret < 0)
81	return ret;
82
83	/* check device ID */
84	if ((ret & 0xFF) != 0x81)
85	return -ENODEV;
86
87	/* Default Values */
88	cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE \|
89	CM32181_CMD_ALS_IT_DEFAULT \| CM32181_CMD_ALS_SM_DEFAULT;
90	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
91
92	/* Initialize registers*/
93	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
94	ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
95	cm32181->conf_regs[i]);
96	if (ret < 0)
97	return ret;
98	}
99
100	return 0;
101	}
102
103	/**
104	* cm32181_read_als_it() - Get sensor integration time (ms)
105	* @cm32181: pointer of struct cm32181
1463a166	106	* @val2: pointer of int to load the als_it value.
971672c0 KT	107	*
	108	* Report the current integartion time by millisecond.
	109	*
1463a166	110	* Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
971672c0	111	*/
1463a166	112	static int cm32181_read_als_it(struct cm32181_chip cm32181, int val2)
971672c0 KT	113	{
	114	u16 als_it;
	115	int i;
	116
	117	als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
	118	als_it &= CM32181_CMD_ALS_IT_MASK;
	119	als_it >>= CM32181_CMD_ALS_IT_SHIFT;
	120	for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
	121	if (als_it == als_it_bits[i]) {
1463a166 BS	122	*val2 = als_it_value[i];
1463a166 BS	123	return IIO_VAL_INT_PLUS_MICRO;
971672c0 KT	124	}
	125	}
	126
	127	return -EINVAL;
	128	}
	129
	130	/**
	131	* cm32181_write_als_it() - Write sensor integration time
	132	* @cm32181: pointer of struct cm32181.
	133	* @val: integration time by millisecond.
	134	*
	135	* Convert integration time (ms) to sensor value.
	136	*
	137	* Return: i2c_smbus_write_word_data command return value.
	138	*/
	139	static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
	140	{
	141	struct i2c_client *client = cm32181->client;
	142	u16 als_it;
	143	int ret, i, n;
	144
	145	n = ARRAY_SIZE(als_it_value);
	146	for (i = 0; i < n; i++)
	147	if (val <= als_it_value[i])
	148	break;
	149	if (i >= n)
	150	i = n - 1;
	151
	152	als_it = als_it_bits[i];
	153	als_it <<= CM32181_CMD_ALS_IT_SHIFT;
	154
	155	mutex_lock(&cm32181->lock);
	156	cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
	157	~CM32181_CMD_ALS_IT_MASK;
	158	cm32181->conf_regs[CM32181_REG_ADDR_CMD] \|=
	159	als_it;
	160	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
	161	cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
	162	mutex_unlock(&cm32181->lock);
	163
	164	return ret;
	165	}
	166
	167	/**
	168	* cm32181_get_lux() - report current lux value
	169	* @cm32181: pointer of struct cm32181.
	170	*
	171	* Convert sensor raw data to lux. It depends on integration
a86ea557	172	* time and calibscale variable.
971672c0 KT	173	*
	174	* Return: Positive value is lux, otherwise is error code.
	175	*/
	176	static int cm32181_get_lux(struct cm32181_chip *cm32181)
	177	{
	178	struct i2c_client *client = cm32181->client;
	179	int ret;
	180	int als_it;
	181	unsigned long lux;
	182
	183	ret = cm32181_read_als_it(cm32181, &als_it);
	184	if (ret < 0)
	185	return -EINVAL;
	186
	187	lux = CM32181_MLUX_PER_BIT;
	188	lux *= CM32181_MLUX_PER_BIT_BASE_IT;
	189	lux /= als_it;
	190
	191	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
	192	if (ret < 0)
	193	return ret;
	194
	195	lux *= ret;
	196	lux *= cm32181->calibscale;
	197	lux /= CM32181_CALIBSCALE_RESOLUTION;
	198	lux /= MLUX_PER_LUX;
	199
	200	if (lux > 0xFFFF)
	201	lux = 0xFFFF;
	202
	203	return lux;
	204	}
	205
	206	static int cm32181_read_raw(struct iio_dev *indio_dev,
	207	struct iio_chan_spec const *chan,
	208	int val, int val2, long mask)
	209	{
	210	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	211	int ret;
	212
	213	switch (mask) {
	214	case IIO_CHAN_INFO_PROCESSED:
	215	ret = cm32181_get_lux(cm32181);
	216	if (ret < 0)
	217	return ret;
	218	*val = ret;
	219	return IIO_VAL_INT;
	220	case IIO_CHAN_INFO_CALIBSCALE:
	221	*val = cm32181->calibscale;
	222	return IIO_VAL_INT;
	223	case IIO_CHAN_INFO_INT_TIME:
41c897f8	224	*val = 0;
1463a166	225	ret = cm32181_read_als_it(cm32181, val2);
971672c0 KT	226	return ret;
	227	}
	228
	229	return -EINVAL;
	230	}
	231
	232	static int cm32181_write_raw(struct iio_dev *indio_dev,
	233	struct iio_chan_spec const *chan,
	234	int val, int val2, long mask)
	235	{
	236	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	237	int ret;
	238
	239	switch (mask) {
	240	case IIO_CHAN_INFO_CALIBSCALE:
	241	cm32181->calibscale = val;
	242	return val;
	243	case IIO_CHAN_INFO_INT_TIME:
1463a166	244	ret = cm32181_write_als_it(cm32181, val2);
971672c0 KT	245	return ret;
	246	}
	247
	248	return -EINVAL;
	249	}
	250
	251	/**
	252	* cm32181_get_it_available() - Get available ALS IT value
	253	* @dev: pointer of struct device.
	254	* @attr: pointer of struct device_attribute.
	255	* @buf: pointer of return string buffer.
	256	*
	257	* Display the available integration time values by millisecond.
	258	*
	259	* Return: string length.
	260	*/
	261	static ssize_t cm32181_get_it_available(struct device *dev,
	262	struct device_attribute attr, char buf)
	263	{
	264	int i, n, len;
	265
	266	n = ARRAY_SIZE(als_it_value);
	267	for (i = 0, len = 0; i < n; i++)
1463a166	268	len += sprintf(buf + len, "0.%06u ", als_it_value[i]);
971672c0 KT	269	return len + sprintf(buf + len, "\n");
	270	}
	271
	272	static const struct iio_chan_spec cm32181_channels[] = {
	273	{
	274	.type = IIO_LIGHT,
	275	.info_mask_separate =
	276	BIT(IIO_CHAN_INFO_PROCESSED) \|
	277	BIT(IIO_CHAN_INFO_CALIBSCALE) \|
	278	BIT(IIO_CHAN_INFO_INT_TIME),
	279	}
	280	};
	281
	282	static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
	283	S_IRUGO, cm32181_get_it_available, NULL, 0);
	284
	285	static struct attribute *cm32181_attributes[] = {
	286	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
	287	NULL,
	288	};
	289
	290	static const struct attribute_group cm32181_attribute_group = {
	291	.attrs = cm32181_attributes
	292	};
	293
	294	static const struct iio_info cm32181_info = {
	295	.driver_module = THIS_MODULE,
	296	.read_raw = &cm32181_read_raw,
	297	.write_raw = &cm32181_write_raw,
	298	.attrs = &cm32181_attribute_group,
	299	};
	300
	301	static int cm32181_probe(struct i2c_client *client,
	302	const struct i2c_device_id *id)
	303	{
	304	struct cm32181_chip *cm32181;
	305	struct iio_dev *indio_dev;
	306	int ret;
	307
	308	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
	309	if (!indio_dev) {
	310	dev_err(&client->dev, "devm_iio_device_alloc failed\n");
	311	return -ENOMEM;
	312	}
	313
	314	cm32181 = iio_priv(indio_dev);
	315	i2c_set_clientdata(client, indio_dev);
	316	cm32181->client = client;
	317
	318	mutex_init(&cm32181->lock);
	319	indio_dev->dev.parent = &client->dev;
	320	indio_dev->channels = cm32181_channels;
	321	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
	322	indio_dev->info = &cm32181_info;
	323	indio_dev->name = id->name;
	324	indio_dev->modes = INDIO_DIRECT_MODE;
	325
	326	ret = cm32181_reg_init(cm32181);
	327	if (ret) {
	328	dev_err(&client->dev,
	329	"%s: register init failed\n",
	330	__func__);
	331	return ret;
	332	}
333
b9785535	334	ret = devm_iio_device_register(&client->dev, indio_dev);
971672c0 KT	335	if (ret) {
	336	dev_err(&client->dev,
	337	"%s: regist device failed\n",
	338	__func__);
	339	return ret;
	340	}
	341
	342	return 0;
	343	}
	344
971672c0 KT	345	static const struct i2c_device_id cm32181_id[] = {
	346	{ "cm32181", 0 },
	347	{ }
	348	};
	349
	350	MODULE_DEVICE_TABLE(i2c, cm32181_id);
	351
	352	static const struct of_device_id cm32181_of_match[] = {
	353	{ .compatible = "capella,cm32181" },
	354	{ }
	355	};
119c4fce	356	MODULE_DEVICE_TABLE(of, cm32181_of_match);
971672c0 KT	357
	358	static struct i2c_driver cm32181_driver = {
	359	.driver = {
	360	.name = "cm32181",
	361	.of_match_table = of_match_ptr(cm32181_of_match),
971672c0 KT	362	},
	363	.id_table = cm32181_id,
	364	.probe = cm32181_probe,
971672c0 KT	365	};
	366
	367	module_i2c_driver(cm32181_driver);
	368
	369	MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
	370	MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
	371	MODULE_LICENSE("GPL");