[linux-2.6-block.git] / drivers / iio / light / cm3232.c

/*
 * CM3232 Ambient Light Sensor
 *
 * Copyright (C) 2014-2015 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.
 *
 * IIO driver for CM3232 (7-bit I2C slave address 0x10).
 */

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/init.h>

/* Registers Address */
#define CM3232_REG_ADDR_CMD		0x00
#define CM3232_REG_ADDR_ALS		0x50
#define CM3232_REG_ADDR_ID		0x53

#define CM3232_CMD_ALS_DISABLE		BIT(0)

#define CM3232_CMD_ALS_IT_SHIFT		2
#define CM3232_CMD_ALS_IT_MASK		(BIT(2) | BIT(3) | BIT(4))
#define CM3232_CMD_ALS_IT_DEFAULT	(0x01 << CM3232_CMD_ALS_IT_SHIFT)

#define CM3232_CMD_ALS_RESET		BIT(6)

#define CM3232_CMD_DEFAULT		CM3232_CMD_ALS_IT_DEFAULT

#define CM3232_HW_ID			0x32
#define CM3232_CALIBSCALE_DEFAULT	100000
#define CM3232_CALIBSCALE_RESOLUTION	100000
#define CM3232_MLUX_PER_LUX		1000

#define CM3232_MLUX_PER_BIT_DEFAULT	64
#define CM3232_MLUX_PER_BIT_BASE_IT	100000

static const struct {
	int val;
	int val2;
	u8 it;
} cm3232_als_it_scales[] = {
	{0, 100000, 0},	/* 0.100000 */
	{0, 200000, 1},	/* 0.200000 */
	{0, 400000, 2},	/* 0.400000 */
	{0, 800000, 3},	/* 0.800000 */
	{1, 600000, 4},	/* 1.600000 */
	{3, 200000, 5},	/* 3.200000 */
};

struct cm3232_als_info {
	u8 regs_cmd_default;
	u8 hw_id;
	int calibscale;
	int mlux_per_bit;
	int mlux_per_bit_base_it;
};

static struct cm3232_als_info cm3232_als_info_default = {
	.regs_cmd_default = CM3232_CMD_DEFAULT,
	.hw_id = CM3232_HW_ID,
	.calibscale = CM3232_CALIBSCALE_DEFAULT,
	.mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT,
	.mlux_per_bit_base_it = CM3232_MLUX_PER_BIT_BASE_IT,
};

struct cm3232_chip {
	struct i2c_client *client;
	struct cm3232_als_info *als_info;
	u8 regs_cmd;
	u16 regs_als;
};

/**
 * cm3232_reg_init() - Initialize CM3232
 * @chip:	pointer of struct cm3232_chip.
 *
 * Check and initialize CM3232 ambient light sensor.
 *
 * Return: 0 for success; otherwise for error code.
 */
static int cm3232_reg_init(struct cm3232_chip *chip)
{
	struct i2c_client *client = chip->client;
	s32 ret;

	chip->als_info = &cm3232_als_info_default;

	/* Identify device */
	ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID);
	if (ret < 0) {
		dev_err(&chip->client->dev, "Error reading addr_id\n");
		return ret;
	}

	if ((ret & 0xFF) != chip->als_info->hw_id)
		return -ENODEV;

	/* Disable and reset device */
	chip->regs_cmd = CM3232_CMD_ALS_DISABLE | CM3232_CMD_ALS_RESET;
	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
					chip->regs_cmd);
	if (ret < 0) {
		dev_err(&chip->client->dev, "Error writing reg_cmd\n");
		return ret;
	}

	/* Register default value */
	chip->regs_cmd = chip->als_info->regs_cmd_default;

	/* Configure register */
	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
					chip->regs_cmd);
	if (ret < 0)
		dev_err(&chip->client->dev, "Error writing reg_cmd\n");

	return 0;
}

/**
 *  cm3232_read_als_it() - Get sensor integration time
 *  @chip:	pointer of struct cm3232_chip
 *  @val:	pointer of int to load the integration (sec).
 *  @val2:	pointer of int to load the integration time (microsecond).
 *
 *  Report the current integration time.
 *
 *  Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
 */
static int cm3232_read_als_it(struct cm3232_chip *chip, int *val, int *val2)
{
	u16 als_it;
	int i;

	als_it = chip->regs_cmd;
	als_it &= CM3232_CMD_ALS_IT_MASK;
	als_it >>= CM3232_CMD_ALS_IT_SHIFT;
	for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
		if (als_it == cm3232_als_it_scales[i].it) {
			*val = cm3232_als_it_scales[i].val;
			*val2 = cm3232_als_it_scales[i].val2;
			return IIO_VAL_INT_PLUS_MICRO;
		}
	}

	return -EINVAL;
}

/**
 * cm3232_write_als_it() - Write sensor integration time
 * @chip:	pointer of struct cm3232_chip.
 * @val:	integration time in second.
 * @val2:	integration time in microsecond.
 *
 * Convert integration time to sensor value.
 *
 * Return: i2c_smbus_write_byte_data command return value.
 */
static int cm3232_write_als_it(struct cm3232_chip *chip, int val, int val2)
{
	struct i2c_client *client = chip->client;
	u16 als_it, cmd;
	int i;
	s32 ret;

	for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
		if (val == cm3232_als_it_scales[i].val &&
			val2 == cm3232_als_it_scales[i].val2) {

			als_it = cm3232_als_it_scales[i].it;
			als_it <<= CM3232_CMD_ALS_IT_SHIFT;

			cmd = chip->regs_cmd & ~CM3232_CMD_ALS_IT_MASK;
			cmd |= als_it;
			ret = i2c_smbus_write_byte_data(client,
							CM3232_REG_ADDR_CMD,
							cmd);
			if (ret < 0)
				return ret;
			chip->regs_cmd = cmd;
			return 0;
		}
	}
	return -EINVAL;
}

/**
 * cm3232_get_lux() - report current lux value
 * @chip:	pointer of struct cm3232_chip.
 *
 * Convert sensor data to lux.  It depends on integration
 * time and calibscale variable.
 *
 * Return: Zero or positive value is lux, otherwise error code.
 */
static int cm3232_get_lux(struct cm3232_chip *chip)
{
	struct i2c_client *client = chip->client;
	struct cm3232_als_info *als_info = chip->als_info;
	int ret;
	int val, val2;
	int als_it;
	u64 lux;

	/* Calculate mlux per bit based on als_it */
	ret = cm3232_read_als_it(chip, &val, &val2);
	if (ret < 0)
		return -EINVAL;
	als_it = val * 1000000 + val2;
	lux = (__force u64)als_info->mlux_per_bit;
	lux *= als_info->mlux_per_bit_base_it;
	lux = div_u64(lux, als_it);

	ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ALS);
	if (ret < 0) {
		dev_err(&client->dev, "Error reading reg_addr_als\n");
		return ret;
	}

	chip->regs_als = (u16)ret;
	lux *= chip->regs_als;
	lux *= als_info->calibscale;
	lux = div_u64(lux, CM3232_CALIBSCALE_RESOLUTION);
	lux = div_u64(lux, CM3232_MLUX_PER_LUX);

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

	return (int)lux;
}

static int cm3232_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int *val, int *val2, long mask)
{
	struct cm3232_chip *chip = iio_priv(indio_dev);
	struct cm3232_als_info *als_info = chip->als_info;
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
		ret = cm3232_get_lux(chip);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBSCALE:
		*val = als_info->calibscale;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		return cm3232_read_als_it(chip, val, val2);
	}

	return -EINVAL;
}

static int cm3232_write_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int val, int val2, long mask)
{
	struct cm3232_chip *chip = iio_priv(indio_dev);
	struct cm3232_als_info *als_info = chip->als_info;

	switch (mask) {
	case IIO_CHAN_INFO_CALIBSCALE:
		als_info->calibscale = val;
		return 0;
	case IIO_CHAN_INFO_INT_TIME:
		return cm3232_write_als_it(chip, val, val2);
	}

	return -EINVAL;
}

/**
 * cm3232_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 in second.
 *
 * Return: string length.
 */
static ssize_t cm3232_get_it_available(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int i, len;

	for (i = 0, len = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++)
		len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ",
			cm3232_als_it_scales[i].val,
			cm3232_als_it_scales[i].val2);
	return len + scnprintf(buf + len, PAGE_SIZE - len, "\n");
}

static const struct iio_chan_spec cm3232_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, cm3232_get_it_available, NULL, 0);

static struct attribute *cm3232_attributes[] = {
	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group cm3232_attribute_group = {
	.attrs = cm3232_attributes
};

static const struct iio_info cm3232_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= &cm3232_read_raw,
	.write_raw		= &cm3232_write_raw,
	.attrs			= &cm3232_attribute_group,
};

static int cm3232_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct cm3232_chip *chip;
	struct iio_dev *indio_dev;
	int ret;

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

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

	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = cm3232_channels;
	indio_dev->num_channels = ARRAY_SIZE(cm3232_channels);
	indio_dev->info = &cm3232_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = cm3232_reg_init(chip);
	if (ret) {
		dev_err(&client->dev,
			"%s: register init failed\n",
			__func__);
		return ret;
	}

	return iio_device_register(indio_dev);
}

static int cm3232_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
		CM3232_CMD_ALS_DISABLE);

	iio_device_unregister(indio_dev);

	return 0;
}

static const struct i2c_device_id cm3232_id[] = {
	{"cm3232", 0},
	{}
};

#ifdef CONFIG_PM_SLEEP
static int cm3232_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct cm3232_chip *chip = iio_priv(indio_dev);
	struct i2c_client *client = chip->client;
	int ret;

	chip->regs_cmd |= CM3232_CMD_ALS_DISABLE;
	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
					chip->regs_cmd);

	return ret;
}

static int cm3232_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct cm3232_chip *chip = iio_priv(indio_dev);
	struct i2c_client *client = chip->client;
	int ret;

	chip->regs_cmd &= ~CM3232_CMD_ALS_DISABLE;
	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
					chip->regs_cmd | CM3232_CMD_ALS_RESET);

	return ret;
}

static const struct dev_pm_ops cm3232_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(cm3232_suspend, cm3232_resume)};
#endif

MODULE_DEVICE_TABLE(i2c, cm3232_id);

static const struct of_device_id cm3232_of_match[] = {
	{.compatible = "capella,cm3232"},
	{}
};
MODULE_DEVICE_TABLE(of, cm3232_of_match);

static struct i2c_driver cm3232_driver = {
	.driver = {
		.name	= "cm3232",
		.of_match_table = of_match_ptr(cm3232_of_match),
#ifdef CONFIG_PM_SLEEP
		.pm	= &cm3232_pm_ops,
#endif
	},
	.id_table	= cm3232_id,
	.probe		= cm3232_probe,
	.remove		= cm3232_remove,
};

module_i2c_driver(cm3232_driver);

MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
MODULE_DESCRIPTION("CM3232 ambient light sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b84894c7 KT	1	/*
	2	* CM3232 Ambient Light Sensor
	3	*
	4	* Copyright (C) 2014-2015 Capella Microsystems Inc.
	5	* Author: Kevin Tsai <ktsai@capellamicro.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2, as published
	9	* by the Free Software Foundation.
	10	*
	11	* IIO driver for CM3232 (7-bit I2C slave address 0x10).
	12	*/
	13
	14	#include <linux/i2c.h>
	15	#include <linux/module.h>
	16	#include <linux/iio/iio.h>
	17	#include <linux/iio/sysfs.h>
	18	#include <linux/init.h>
	19
	20	/* Registers Address */
	21	#define CM3232_REG_ADDR_CMD 0x00
	22	#define CM3232_REG_ADDR_ALS 0x50
	23	#define CM3232_REG_ADDR_ID 0x53
	24
	25	#define CM3232_CMD_ALS_DISABLE BIT(0)
	26
	27	#define CM3232_CMD_ALS_IT_SHIFT 2
	28	#define CM3232_CMD_ALS_IT_MASK (BIT(2) \| BIT(3) \| BIT(4))
	29	#define CM3232_CMD_ALS_IT_DEFAULT (0x01 << CM3232_CMD_ALS_IT_SHIFT)
	30
	31	#define CM3232_CMD_ALS_RESET BIT(6)
	32
	33	#define CM3232_CMD_DEFAULT CM3232_CMD_ALS_IT_DEFAULT
	34
	35	#define CM3232_HW_ID 0x32
	36	#define CM3232_CALIBSCALE_DEFAULT 100000
	37	#define CM3232_CALIBSCALE_RESOLUTION 100000
	38	#define CM3232_MLUX_PER_LUX 1000
	39
	40	#define CM3232_MLUX_PER_BIT_DEFAULT 64
	41	#define CM3232_MLUX_PER_BIT_BASE_IT 100000
	42
	43	static const struct {
	44	int val;
	45	int val2;
	46	u8 it;
	47	} cm3232_als_it_scales[] = {
	48	{0, 100000, 0}, /* 0.100000 */
	49	{0, 200000, 1}, /* 0.200000 */
	50	{0, 400000, 2}, /* 0.400000 */
	51	{0, 800000, 3}, /* 0.800000 */
	52	{1, 600000, 4}, /* 1.600000 */
	53	{3, 200000, 5}, /* 3.200000 */
	54	};
	55
	56	struct cm3232_als_info {
	57	u8 regs_cmd_default;
	58	u8 hw_id;
	59	int calibscale;
	60	int mlux_per_bit;
	61	int mlux_per_bit_base_it;
	62	};
	63
	64	static struct cm3232_als_info cm3232_als_info_default = {
65	.regs_cmd_default = CM3232_CMD_DEFAULT,
66	.hw_id = CM3232_HW_ID,
67	.calibscale = CM3232_CALIBSCALE_DEFAULT,
68	.mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT,
69	.mlux_per_bit_base_it = CM3232_MLUX_PER_BIT_BASE_IT,
70	};
71
72	struct cm3232_chip {
73	struct i2c_client *client;
74	struct cm3232_als_info *als_info;
75	u8 regs_cmd;
76	u16 regs_als;
77	};
78
79	/**
80	* cm3232_reg_init() - Initialize CM3232
81	* @chip: pointer of struct cm3232_chip.
82	*
83	* Check and initialize CM3232 ambient light sensor.
84	*
85	* Return: 0 for success; otherwise for error code.
86	*/
87	static int cm3232_reg_init(struct cm3232_chip *chip)
88	{
89	struct i2c_client *client = chip->client;
90	s32 ret;
91
92	chip->als_info = &cm3232_als_info_default;
93
94	/* Identify device */
95	ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID);
96	if (ret < 0) {
97	dev_err(&chip->client->dev, "Error reading addr_id\n");
98	return ret;
99	}
100
101	if ((ret & 0xFF) != chip->als_info->hw_id)
102	return -ENODEV;
103
104	/* Disable and reset device */
105	chip->regs_cmd = CM3232_CMD_ALS_DISABLE \| CM3232_CMD_ALS_RESET;
106	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
107	chip->regs_cmd);
108	if (ret < 0) {
109	dev_err(&chip->client->dev, "Error writing reg_cmd\n");
110	return ret;
111	}
112
113	/* Register default value */
114	chip->regs_cmd = chip->als_info->regs_cmd_default;
115
116	/* Configure register */
117	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
118	chip->regs_cmd);
119	if (ret < 0)
120	dev_err(&chip->client->dev, "Error writing reg_cmd\n");
121
122	return 0;
123	}
124
125	/**
126	* cm3232_read_als_it() - Get sensor integration time
127	* @chip: pointer of struct cm3232_chip
128	* @val: pointer of int to load the integration (sec).
129	* @val2: pointer of int to load the integration time (microsecond).
130	*
131	* Report the current integration time.
132	*
133	* Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
134	*/
135	static int cm3232_read_als_it(struct cm3232_chip chip, int val, int *val2)
136	{
137	u16 als_it;
138	int i;
139
140	als_it = chip->regs_cmd;
141	als_it &= CM3232_CMD_ALS_IT_MASK;
142	als_it >>= CM3232_CMD_ALS_IT_SHIFT;
143	for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
144	if (als_it == cm3232_als_it_scales[i].it) {
145	*val = cm3232_als_it_scales[i].val;
146	*val2 = cm3232_als_it_scales[i].val2;
147	return IIO_VAL_INT_PLUS_MICRO;
148	}
149	}
150
151	return -EINVAL;
152	}
153
154	/**
155	* cm3232_write_als_it() - Write sensor integration time
156	* @chip: pointer of struct cm3232_chip.
157	* @val: integration time in second.
158	* @val2: integration time in microsecond.
159	*
160	* Convert integration time to sensor value.
161	*
162	* Return: i2c_smbus_write_byte_data command return value.
163	*/
164	static int cm3232_write_als_it(struct cm3232_chip *chip, int val, int val2)
165	{
166	struct i2c_client *client = chip->client;
167	u16 als_it, cmd;
168	int i;
169	s32 ret;
170
171	for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
172	if (val == cm3232_als_it_scales[i].val &&
173	val2 == cm3232_als_it_scales[i].val2) {
174
175	als_it = cm3232_als_it_scales[i].it;
176	als_it <<= CM3232_CMD_ALS_IT_SHIFT;
177
178	cmd = chip->regs_cmd & ~CM3232_CMD_ALS_IT_MASK;
179	cmd \|= als_it;
180	ret = i2c_smbus_write_byte_data(client,
181	CM3232_REG_ADDR_CMD,
182	cmd);
183	if (ret < 0)
184	return ret;
185	chip->regs_cmd = cmd;
186	return 0;
187	}
188	}
189	return -EINVAL;
190	}
191
192	/**
193	* cm3232_get_lux() - report current lux value
194	* @chip: pointer of struct cm3232_chip.
195	*
196	* Convert sensor data to lux. It depends on integration
197	* time and calibscale variable.
198	*
199	* Return: Zero or positive value is lux, otherwise error code.
200	*/
201	static int cm3232_get_lux(struct cm3232_chip *chip)
202	{
203	struct i2c_client *client = chip->client;
204	struct cm3232_als_info *als_info = chip->als_info;
205	int ret;
206	int val, val2;
207	int als_it;
208	u64 lux;
209
210	/* Calculate mlux per bit based on als_it */
211	ret = cm3232_read_als_it(chip, &val, &val2);
212	if (ret < 0)
213	return -EINVAL;
214	als_it = val * 1000000 + val2;
215	lux = (__force u64)als_info->mlux_per_bit;
216	lux *= als_info->mlux_per_bit_base_it;
217	lux = div_u64(lux, als_it);
218
219	ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ALS);
220	if (ret < 0) {
221	dev_err(&client->dev, "Error reading reg_addr_als\n");
222	return ret;
223	}
224
225	chip->regs_als = (u16)ret;
226	lux *= chip->regs_als;
227	lux *= als_info->calibscale;
228	lux = div_u64(lux, CM3232_CALIBSCALE_RESOLUTION);
229	lux = div_u64(lux, CM3232_MLUX_PER_LUX);
230
231	if (lux > 0xFFFF)
232	lux = 0xFFFF;
233
234	return (int)lux;
235	}
236
237	static int cm3232_read_raw(struct iio_dev *indio_dev,
238	struct iio_chan_spec const *chan,
239	int val, int val2, long mask)
240	{
241	struct cm3232_chip *chip = iio_priv(indio_dev);
242	struct cm3232_als_info *als_info = chip->als_info;
243	int ret;
244
245	switch (mask) {
246	case IIO_CHAN_INFO_PROCESSED:
247	ret = cm3232_get_lux(chip);
248	if (ret < 0)
249	return ret;
250	*val = ret;
251	return IIO_VAL_INT;
252	case IIO_CHAN_INFO_CALIBSCALE:
253	*val = als_info->calibscale;
254	return IIO_VAL_INT;
255	case IIO_CHAN_INFO_INT_TIME:
256	return cm3232_read_als_it(chip, val, val2);
257	}
258
259	return -EINVAL;
260	}
261
262	static int cm3232_write_raw(struct iio_dev *indio_dev,
263	struct iio_chan_spec const *chan,
264	int val, int val2, long mask)
265	{
266	struct cm3232_chip *chip = iio_priv(indio_dev);
267	struct cm3232_als_info *als_info = chip->als_info;
268
269	switch (mask) {
270	case IIO_CHAN_INFO_CALIBSCALE:
271	als_info->calibscale = val;
272	return 0;
273	case IIO_CHAN_INFO_INT_TIME:
274	return cm3232_write_als_it(chip, val, val2);
275	}
276
277	return -EINVAL;
278	}
279
280	/**
281	* cm3232_get_it_available() - Get available ALS IT value
282	* @dev: pointer of struct device.
283	* @attr: pointer of struct device_attribute.
284	* @buf: pointer of return string buffer.
285	*
286	* Display the available integration time in second.
287	*
288	* Return: string length.
289	*/
290	static ssize_t cm3232_get_it_available(struct device *dev,
291	struct device_attribute attr, char buf)
292	{
293	int i, len;
294
295	for (i = 0, len = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++)
296	len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ",
297	cm3232_als_it_scales[i].val,
298	cm3232_als_it_scales[i].val2);
299	return len + scnprintf(buf + len, PAGE_SIZE - len, "\n");
300	}
301
302	static const struct iio_chan_spec cm3232_channels[] = {
303	{
304	.type = IIO_LIGHT,
305	.info_mask_separate =
306	BIT(IIO_CHAN_INFO_PROCESSED) \|
307	BIT(IIO_CHAN_INFO_CALIBSCALE) \|
308	BIT(IIO_CHAN_INFO_INT_TIME),
309	}
310	};
311
312	static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
313	S_IRUGO, cm3232_get_it_available, NULL, 0);
314
315	static struct attribute *cm3232_attributes[] = {
316	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
317	NULL,
318	};
319
320	static const struct attribute_group cm3232_attribute_group = {
321	.attrs = cm3232_attributes
322	};
323
324	static const struct iio_info cm3232_info = {
325	.driver_module = THIS_MODULE,
326	.read_raw = &cm3232_read_raw,
327	.write_raw = &cm3232_write_raw,
328	.attrs = &cm3232_attribute_group,
329	};
330
331	static int cm3232_probe(struct i2c_client *client,
332	const struct i2c_device_id *id)
333	{
334	struct cm3232_chip *chip;
335	struct iio_dev *indio_dev;
336	int ret;
337
338	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
339	if (!indio_dev)
340	return -ENOMEM;
341
342	chip = iio_priv(indio_dev);
343	i2c_set_clientdata(client, indio_dev);
344	chip->client = client;
345
346	indio_dev->dev.parent = &client->dev;
347	indio_dev->channels = cm3232_channels;
348	indio_dev->num_channels = ARRAY_SIZE(cm3232_channels);
349	indio_dev->info = &cm3232_info;
350	indio_dev->name = id->name;
351	indio_dev->modes = INDIO_DIRECT_MODE;
352
353	ret = cm3232_reg_init(chip);
354	if (ret) {
355	dev_err(&client->dev,
356	"%s: register init failed\n",
357	__func__);
358	return ret;
359	}
360
361	return iio_device_register(indio_dev);
362	}
363
364	static int cm3232_remove(struct i2c_client *client)
365	{
366	struct iio_dev *indio_dev = i2c_get_clientdata(client);
367
368	i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
369	CM3232_CMD_ALS_DISABLE);
370
371	iio_device_unregister(indio_dev);
372
373	return 0;
374	}
375
376	static const struct i2c_device_id cm3232_id[] = {
377	{"cm3232", 0},
378	{}
379	};
380
1ec28ce6 KT	381	#ifdef CONFIG_PM_SLEEP
	382	static int cm3232_suspend(struct device *dev)
	383	{
	384	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	385	struct cm3232_chip *chip = iio_priv(indio_dev);
	386	struct i2c_client *client = chip->client;
	387	int ret;
	388
	389	chip->regs_cmd \|= CM3232_CMD_ALS_DISABLE;
	390	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	391	chip->regs_cmd);
	392
	393	return ret;
	394	}
	395
	396	static int cm3232_resume(struct device *dev)
	397	{
	398	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	399	struct cm3232_chip *chip = iio_priv(indio_dev);
	400	struct i2c_client *client = chip->client;
	401	int ret;
	402
	403	chip->regs_cmd &= ~CM3232_CMD_ALS_DISABLE;
	404	ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	405	chip->regs_cmd \| CM3232_CMD_ALS_RESET);
	406
	407	return ret;
	408	}
	409
	410	static const struct dev_pm_ops cm3232_pm_ops = {
	411	SET_SYSTEM_SLEEP_PM_OPS(cm3232_suspend, cm3232_resume)};
	412	#endif
	413
b84894c7 KT	414	MODULE_DEVICE_TABLE(i2c, cm3232_id);
	415
	416	static const struct of_device_id cm3232_of_match[] = {
	417	{.compatible = "capella,cm3232"},
	418	{}
	419	};
119c4fce	420	MODULE_DEVICE_TABLE(of, cm3232_of_match);
b84894c7 KT	421
	422	static struct i2c_driver cm3232_driver = {
	423	.driver = {
	424	.name = "cm3232",
b84894c7	425	.of_match_table = of_match_ptr(cm3232_of_match),
1ec28ce6 KT	426	#ifdef CONFIG_PM_SLEEP
	427	.pm = &cm3232_pm_ops,
	428	#endif
b84894c7 KT	429	},
	430	.id_table = cm3232_id,
	431	.probe = cm3232_probe,
	432	.remove = cm3232_remove,
	433	};
	434
	435	module_i2c_driver(cm3232_driver);
	436
	437	MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
	438	MODULE_DESCRIPTION("CM3232 ambient light sensor driver");
	439	MODULE_LICENSE("GPL");