[mirror_ubuntu-bionic-kernel.git] / drivers / iio / light / tsl4531.c

/*
 * tsl4531.c - Support for TAOS TSL4531 ambient light sensor
 *
 * Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for the TSL4531x family
 *   TSL45311/TSL45313: 7-bit I2C slave address 0x39
 *   TSL45315/TSL45317: 7-bit I2C slave address 0x29
 *
 * TODO: single cycle measurement
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>

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

#define TSL4531_DRV_NAME "tsl4531"

#define TSL4531_COMMAND BIT(7)

#define TSL4531_CONTROL (TSL4531_COMMAND | 0x00)
#define TSL4531_CONFIG (TSL4531_COMMAND | 0x01)
#define TSL4531_DATA (TSL4531_COMMAND | 0x04)
#define TSL4531_ID (TSL4531_COMMAND | 0x0a)

/* operating modes in control register */
#define TSL4531_MODE_POWERDOWN 0x00
#define TSL4531_MODE_SINGLE_ADC 0x02
#define TSL4531_MODE_NORMAL 0x03

/* integration time control in config register */
#define TSL4531_TCNTRL_400MS 0x00
#define TSL4531_TCNTRL_200MS 0x01
#define TSL4531_TCNTRL_100MS 0x02

/* part number in id register */
#define TSL45311_ID 0x8
#define TSL45313_ID 0x9
#define TSL45315_ID 0xa
#define TSL45317_ID 0xb
#define TSL4531_ID_SHIFT 4

struct tsl4531_data {
	struct i2c_client *client;
	struct mutex lock;
	int int_time;
};

static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");

static struct attribute *tsl4531_attributes[] = {
	&iio_const_attr_integration_time_available.dev_attr.attr,
	NULL
};

static const struct attribute_group tsl4531_attribute_group = {
	.attrs = tsl4531_attributes,
};

static const struct iio_chan_spec tsl4531_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME)
	}
};

static int tsl4531_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	struct tsl4531_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = i2c_smbus_read_word_data(data->client,
			TSL4531_DATA);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		/* 0.. 1x, 1 .. 2x, 2 .. 4x */
		*val = 1 << data->int_time;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		if (data->int_time == 0)
			*val2 = 400000;
		else if (data->int_time == 1)
			*val2 = 200000;
		else if (data->int_time == 2)
			*val2 = 100000;
		else
			return -EINVAL;
		*val = 0;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static int tsl4531_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct tsl4531_data *data = iio_priv(indio_dev);
	int int_time, ret;

	switch (mask) {
	case IIO_CHAN_INFO_INT_TIME:
		if (val != 0)
			return -EINVAL;
		if (val2 == 400000)
			int_time = 0;
		else if (val2 == 200000)
			int_time = 1;
		else if (val2 == 100000)
			int_time = 2;
		else
			return -EINVAL;
		mutex_lock(&data->lock);
		ret = i2c_smbus_write_byte_data(data->client,
			TSL4531_CONFIG, int_time);
		if (ret >= 0)
			data->int_time = int_time;
		mutex_unlock(&data->lock);
		return ret;
	default:
		return -EINVAL;
	}
}

static const struct iio_info tsl4531_info = {
	.read_raw = tsl4531_read_raw,
	.write_raw = tsl4531_write_raw,
	.attrs = &tsl4531_attribute_group,
};

static int tsl4531_check_id(struct i2c_client *client)
{
	int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
	if (ret < 0)
		return ret;

	switch (ret >> TSL4531_ID_SHIFT) {
	case TSL45311_ID:
	case TSL45313_ID:
	case TSL45315_ID:
	case TSL45317_ID:
		return 0;
	default:
		return -ENODEV;
	}
}

static int tsl4531_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct tsl4531_data *data;
	struct iio_dev *indio_dev;
	int ret;

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

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	mutex_init(&data->lock);

	ret = tsl4531_check_id(client);
	if (ret) {
		dev_err(&client->dev, "no TSL4531 sensor\n");
		return ret;
	}

	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,
		TSL4531_MODE_NORMAL);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,
		TSL4531_TCNTRL_400MS);
	if (ret < 0)
		return ret;

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &tsl4531_info;
	indio_dev->channels = tsl4531_channels;
	indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);
	indio_dev->name = TSL4531_DRV_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;

	return iio_device_register(indio_dev);
}

static int tsl4531_powerdown(struct i2c_client *client)
{
	return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
		TSL4531_MODE_POWERDOWN);
}

static int tsl4531_remove(struct i2c_client *client)
{
	iio_device_unregister(i2c_get_clientdata(client));
	tsl4531_powerdown(client);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tsl4531_suspend(struct device *dev)
{
	return tsl4531_powerdown(to_i2c_client(dev));
}

static int tsl4531_resume(struct device *dev)
{
	return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,
		TSL4531_MODE_NORMAL);
}

static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
#define TSL4531_PM_OPS (&tsl4531_pm_ops)
#else
#define TSL4531_PM_OPS NULL
#endif

static const struct i2c_device_id tsl4531_id[] = {
	{ "tsl4531", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tsl4531_id);

static struct i2c_driver tsl4531_driver = {
	.driver = {
		.name   = TSL4531_DRV_NAME,
		.pm	= TSL4531_PM_OPS,
	},
	.probe  = tsl4531_probe,
	.remove = tsl4531_remove,
	.id_table = tsl4531_id,
};

module_i2c_driver(tsl4531_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
aab9ba7e PM	1	/*
	2	* tsl4531.c - Support for TAOS TSL4531 ambient light sensor
	3	*
	4	* Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net>
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*
	10	* IIO driver for the TSL4531x family
	11	* TSL45311/TSL45313: 7-bit I2C slave address 0x39
	12	* TSL45315/TSL45317: 7-bit I2C slave address 0x29
	13	*
	14	* TODO: single cycle measurement
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/i2c.h>
	19	#include <linux/err.h>
	20	#include <linux/delay.h>
	21
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24
	25	#define TSL4531_DRV_NAME "tsl4531"
	26
6b57573b	27	#define TSL4531_COMMAND BIT(7)
aab9ba7e	28
6b57573b PM	29	#define TSL4531_CONTROL (TSL4531_COMMAND \| 0x00)
	30	#define TSL4531_CONFIG (TSL4531_COMMAND \| 0x01)
	31	#define TSL4531_DATA (TSL4531_COMMAND \| 0x04)
	32	#define TSL4531_ID (TSL4531_COMMAND \| 0x0a)
aab9ba7e PM	33
	34	/* operating modes in control register */
	35	#define TSL4531_MODE_POWERDOWN 0x00
	36	#define TSL4531_MODE_SINGLE_ADC 0x02
	37	#define TSL4531_MODE_NORMAL 0x03
	38
	39	/* integration time control in config register */
	40	#define TSL4531_TCNTRL_400MS 0x00
	41	#define TSL4531_TCNTRL_200MS 0x01
	42	#define TSL4531_TCNTRL_100MS 0x02
	43
	44	/* part number in id register */
	45	#define TSL45311_ID 0x8
	46	#define TSL45313_ID 0x9
	47	#define TSL45315_ID 0xa
	48	#define TSL45317_ID 0xb
	49	#define TSL4531_ID_SHIFT 4
	50
	51	struct tsl4531_data {
	52	struct i2c_client *client;
	53	struct mutex lock;
	54	int int_time;
	55	};
	56
	57	static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");
	58
	59	static struct attribute *tsl4531_attributes[] = {
	60	&iio_const_attr_integration_time_available.dev_attr.attr,
	61	NULL
	62	};
	63
	64	static const struct attribute_group tsl4531_attribute_group = {
	65	.attrs = tsl4531_attributes,
	66	};
	67
	68	static const struct iio_chan_spec tsl4531_channels[] = {
	69	{
	70	.type = IIO_LIGHT,
	71	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	72	BIT(IIO_CHAN_INFO_SCALE) \|
	73	BIT(IIO_CHAN_INFO_INT_TIME)
	74	}
	75	};
	76
	77	static int tsl4531_read_raw(struct iio_dev *indio_dev,
	78	struct iio_chan_spec const *chan,
	79	int val, int val2, long mask)
	80	{
	81	struct tsl4531_data *data = iio_priv(indio_dev);
	82	int ret;
	83
	84	switch (mask) {
	85	case IIO_CHAN_INFO_RAW:
	86	ret = i2c_smbus_read_word_data(data->client,
	87	TSL4531_DATA);
	88	if (ret < 0)
	89	return ret;
	90	*val = ret;
	91	return IIO_VAL_INT;
	92	case IIO_CHAN_INFO_SCALE:
	93	/* 0.. 1x, 1 .. 2x, 2 .. 4x */
	94	*val = 1 << data->int_time;
	95	return IIO_VAL_INT;
	96	case IIO_CHAN_INFO_INT_TIME:
97	if (data->int_time == 0)
98	*val2 = 400000;
99	else if (data->int_time == 1)
100	*val2 = 200000;
101	else if (data->int_time == 2)
102	*val2 = 100000;
103	else
104	return -EINVAL;
105	*val = 0;
106	return IIO_VAL_INT_PLUS_MICRO;
107	default:
108	return -EINVAL;
109	}
110	}
111
112	static int tsl4531_write_raw(struct iio_dev *indio_dev,
113	struct iio_chan_spec const *chan,
114	int val, int val2, long mask)
115	{
116	struct tsl4531_data *data = iio_priv(indio_dev);
117	int int_time, ret;
118
119	switch (mask) {
120	case IIO_CHAN_INFO_INT_TIME:
121	if (val != 0)
122	return -EINVAL;
123	if (val2 == 400000)
124	int_time = 0;
125	else if (val2 == 200000)
126	int_time = 1;
127	else if (val2 == 100000)
128	int_time = 2;
129	else
130	return -EINVAL;
131	mutex_lock(&data->lock);
132	ret = i2c_smbus_write_byte_data(data->client,
133	TSL4531_CONFIG, int_time);
134	if (ret >= 0)
135	data->int_time = int_time;
136	mutex_unlock(&data->lock);
137	return ret;
138	default:
139	return -EINVAL;
140	}
141	}
142
143	static const struct iio_info tsl4531_info = {
144	.read_raw = tsl4531_read_raw,
145	.write_raw = tsl4531_write_raw,
146	.attrs = &tsl4531_attribute_group,
aab9ba7e PM	147	};
	148
	149	static int tsl4531_check_id(struct i2c_client *client)
	150	{
	151	int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
	152	if (ret < 0)
	153	return ret;
	154
	155	switch (ret >> TSL4531_ID_SHIFT) {
	156	case TSL45311_ID:
	157	case TSL45313_ID:
	158	case TSL45315_ID:
	159	case TSL45317_ID:
aab9ba7e	160	return 0;
7d87b3c5 DC	161	default:
7d87b3c5 DC	162	return -ENODEV;
aab9ba7e PM	163	}
	164	}
	165
	166	static int tsl4531_probe(struct i2c_client *client,
	167	const struct i2c_device_id *id)
	168	{
	169	struct tsl4531_data *data;
	170	struct iio_dev *indio_dev;
	171	int ret;
	172
	173	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	174	if (!indio_dev)
	175	return -ENOMEM;
	176
	177	data = iio_priv(indio_dev);
	178	i2c_set_clientdata(client, indio_dev);
	179	data->client = client;
	180	mutex_init(&data->lock);
	181
7d87b3c5 DC	182	ret = tsl4531_check_id(client);
7d87b3c5 DC	183	if (ret) {
aab9ba7e	184	dev_err(&client->dev, "no TSL4531 sensor\n");
7d87b3c5	185	return ret;
aab9ba7e PM	186	}
	187
	188	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,
	189	TSL4531_MODE_NORMAL);
	190	if (ret < 0)
	191	return ret;
	192
	193	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,
	194	TSL4531_TCNTRL_400MS);
	195	if (ret < 0)
	196	return ret;
	197
	198	indio_dev->dev.parent = &client->dev;
	199	indio_dev->info = &tsl4531_info;
	200	indio_dev->channels = tsl4531_channels;
	201	indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);
	202	indio_dev->name = TSL4531_DRV_NAME;
	203	indio_dev->modes = INDIO_DIRECT_MODE;
	204
	205	return iio_device_register(indio_dev);
	206	}
	207
	208	static int tsl4531_powerdown(struct i2c_client *client)
	209	{
	210	return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
	211	TSL4531_MODE_POWERDOWN);
	212	}
	213
	214	static int tsl4531_remove(struct i2c_client *client)
	215	{
	216	iio_device_unregister(i2c_get_clientdata(client));
	217	tsl4531_powerdown(client);
	218
	219	return 0;
	220	}
	221
	222	#ifdef CONFIG_PM_SLEEP
	223	static int tsl4531_suspend(struct device *dev)
	224	{
	225	return tsl4531_powerdown(to_i2c_client(dev));
	226	}
	227
	228	static int tsl4531_resume(struct device *dev)
	229	{
	230	return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,
	231	TSL4531_MODE_NORMAL);
	232	}
aab9ba7e PM	233
aab9ba7e PM	234	static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
03045bcf DM	235	#define TSL4531_PM_OPS (&tsl4531_pm_ops)
	236	#else
	237	#define TSL4531_PM_OPS NULL
	238	#endif
aab9ba7e PM	239
	240	static const struct i2c_device_id tsl4531_id[] = {
	241	{ "tsl4531", 0 },
	242	{ }
	243	};
	244	MODULE_DEVICE_TABLE(i2c, tsl4531_id);
	245
	246	static struct i2c_driver tsl4531_driver = {
	247	.driver = {
	248	.name = TSL4531_DRV_NAME,
03045bcf	249	.pm = TSL4531_PM_OPS,
aab9ba7e PM	250	},
	251	.probe = tsl4531_probe,
	252	.remove = tsl4531_remove,
	253	.id_table = tsl4531_id,
	254	};
	255
	256	module_i2c_driver(tsl4531_driver);
	257
	258	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	259	MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
	260	MODULE_LICENSE("GPL");