[deliverable/linux.git] / drivers / iio / light / tcs3414.c

/*
 * tcs3414.c - Support for TAOS TCS3414 digital color sensor
 *
 * Copyright (c) 2014 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.
 *
 * Digital color sensor with 16-bit channels for red, green, blue, clear);
 * 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
 * TCS3415, TCS3416, resp.)
 *
 * TODO: sync, interrupt support, thresholds, prescaler
 */

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

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>

#define TCS3414_DRV_NAME "tcs3414"

#define TCS3414_COMMAND BIT(7)
#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))

#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
#define TCS3414_ID (TCS3414_COMMAND | 0x04)
#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)

#define TCS3414_CONTROL_ADC_VALID BIT(4)
#define TCS3414_CONTROL_ADC_EN BIT(1)
#define TCS3414_CONTROL_POWER BIT(0)

#define TCS3414_INTEG_MASK GENMASK(1, 0)
#define TCS3414_INTEG_12MS 0x0
#define TCS3414_INTEG_100MS 0x1
#define TCS3414_INTEG_400MS 0x2

#define TCS3414_GAIN_MASK GENMASK(5, 4)
#define TCS3414_GAIN_SHIFT 4

struct tcs3414_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 control;
	u8 gain;
	u8 timing;
	u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
};

#define TCS3414_CHANNEL(_color, _si, _addr) { \
	.type = IIO_INTENSITY, \
	.modified = 1, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
		BIT(IIO_CHAN_INFO_INT_TIME), \
	.channel2 = IIO_MOD_LIGHT_##_color, \
	.address = _addr, \
	.scan_index = _si, \
	.scan_type = { \
		.sign = 'u', \
		.realbits = 16, \
		.storagebits = 16, \
		.endianness = IIO_CPU, \
	}, \
}

/* scale factors: 1/gain */
static const int tcs3414_scales[][2] = {
	{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
};

/* integration time in ms */
static const int tcs3414_times[] = { 12, 100, 400 };

static const struct iio_chan_spec tcs3414_channels[] = {
	TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
	TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
	TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
	TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
	IIO_CHAN_SOFT_TIMESTAMP(4),
};

static int tcs3414_req_data(struct tcs3414_data *data)
{
	int tries = 25;
	int ret;

	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control | TCS3414_CONTROL_ADC_EN);
	if (ret < 0)
		return ret;

	while (tries--) {
		ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
		if (ret < 0)
			return ret;
		if (ret & TCS3414_CONTROL_ADC_VALID)
			break;
		msleep(20);
	}

	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
	if (ret < 0)
		return ret;

	if (tries < 0) {
		dev_err(&data->client->dev, "data not ready\n");
		return -EIO;
	}

	return 0;
}

static int tcs3414_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2, long mask)
{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i, ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
			return -EBUSY;
		mutex_lock(&data->lock);
		ret = tcs3414_req_data(data);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			return ret;
		}
		ret = i2c_smbus_read_word_data(data->client, chan->address);
		mutex_unlock(&data->lock);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
		*val = tcs3414_scales[i][0];
		*val2 = tcs3414_scales[i][1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		*val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
		return IIO_VAL_INT_PLUS_MICRO;
	}
	return -EINVAL;
}

static int tcs3414_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val, int val2, long mask)
{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
			if (val == tcs3414_scales[i][0] &&
				val2 == tcs3414_scales[i][1]) {
				data->gain &= ~TCS3414_GAIN_MASK;
				data->gain |= i << TCS3414_GAIN_SHIFT;
				return i2c_smbus_write_byte_data(
					data->client, TCS3414_GAIN,
					data->gain);
			}
		}
		return -EINVAL;
	case IIO_CHAN_INFO_INT_TIME:
		if (val != 0)
			return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
			if (val2 == tcs3414_times[i] * 1000) {
				data->timing &= ~TCS3414_INTEG_MASK;
				data->timing |= i;
				return i2c_smbus_write_byte_data(
					data->client, TCS3414_TIMING,
					data->timing);
			}
		}
		return -EINVAL;
	default:
		return -EINVAL;
	}
}

static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i, j = 0;

	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		int ret = i2c_smbus_read_word_data(data->client,
			TCS3414_DATA_GREEN + 2*i);
		if (ret < 0)
			goto done;

		data->buffer[j++] = ret;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
		iio_get_time_ns());

done:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");

static struct attribute *tcs3414_attributes[] = {
	&iio_const_attr_scale_available.dev_attr.attr,
	&iio_const_attr_integration_time_available.dev_attr.attr,
	NULL
};

static const struct attribute_group tcs3414_attribute_group = {
	.attrs = tcs3414_attributes,
};

static const struct iio_info tcs3414_info = {
	.read_raw = tcs3414_read_raw,
	.write_raw = tcs3414_write_raw,
	.attrs = &tcs3414_attribute_group,
	.driver_module = THIS_MODULE,
};

static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
{
	struct tcs3414_data *data = iio_priv(indio_dev);

	data->control |= TCS3414_CONTROL_ADC_EN;
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
}

static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int ret;

	ret = iio_triggered_buffer_predisable(indio_dev);
	if (ret < 0)
		return ret;

	data->control &= ~TCS3414_CONTROL_ADC_EN;
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
}

static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
	.preenable = tcs3414_buffer_preenable,
	.postenable = &iio_triggered_buffer_postenable,
	.predisable = tcs3414_buffer_predisable,
};

static int tcs3414_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct tcs3414_data *data;
	struct iio_dev *indio_dev;
	int ret;

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

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

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &tcs3414_info;
	indio_dev->name = TCS3414_DRV_NAME;
	indio_dev->channels = tcs3414_channels;
	indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
	if (ret < 0)
		return ret;

	switch (ret & 0xf0) {
	case 0x00:
		dev_info(&client->dev, "TCS3404 found\n");
		break;
	case 0x10:
		dev_info(&client->dev, "TCS3413/14/15/16 found\n");
		break;
	default:
		return -ENODEV;
	}

	data->control = TCS3414_CONTROL_POWER;
	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
	if (ret < 0)
		return ret;

	data->timing = TCS3414_INTEG_12MS; /* free running */
	ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
		data->timing);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
	if (ret < 0)
		return ret;
	data->gain = ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
		tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
	if (ret < 0)
		return ret;

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		goto buffer_cleanup;

	return 0;

buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
	return ret;
}

static int tcs3414_powerdown(struct tcs3414_data *data)
{
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control & ~(TCS3414_CONTROL_POWER |
		TCS3414_CONTROL_ADC_EN));
}

static int tcs3414_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	tcs3414_powerdown(iio_priv(indio_dev));

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tcs3414_suspend(struct device *dev)
{
	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
	return tcs3414_powerdown(data);
}

static int tcs3414_resume(struct device *dev)
{
	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
}
#endif

static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);

static const struct i2c_device_id tcs3414_id[] = {
	{ "tcs3414", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tcs3414_id);

static struct i2c_driver tcs3414_driver = {
	.driver = {
		.name	= TCS3414_DRV_NAME,
		.pm	= &tcs3414_pm_ops,
		.owner	= THIS_MODULE,
	},
	.probe		= tcs3414_probe,
	.remove		= tcs3414_remove,
	.id_table	= tcs3414_id,
};
module_i2c_driver(tcs3414_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
a244e7b5 PM	1	/*
	2	* tcs3414.c - Support for TAOS TCS3414 digital color sensor
	3	*
	4	* Copyright (c) 2014 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	* Digital color sensor with 16-bit channels for red, green, blue, clear);
	11	* 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
	12	* TCS3415, TCS3416, resp.)
	13	*
	14	* TODO: sync, interrupt support, thresholds, prescaler
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/i2c.h>
	19	#include <linux/delay.h>
	20	#include <linux/pm.h>
	21
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24	#include <linux/iio/trigger_consumer.h>
	25	#include <linux/iio/buffer.h>
	26	#include <linux/iio/triggered_buffer.h>
	27
	28	#define TCS3414_DRV_NAME "tcs3414"
	29
	30	#define TCS3414_COMMAND BIT(7)
	31	#define TCS3414_COMMAND_WORD (TCS3414_COMMAND \| BIT(5))
	32
	33	#define TCS3414_CONTROL (TCS3414_COMMAND \| 0x00)
	34	#define TCS3414_TIMING (TCS3414_COMMAND \| 0x01)
	35	#define TCS3414_ID (TCS3414_COMMAND \| 0x04)
	36	#define TCS3414_GAIN (TCS3414_COMMAND \| 0x07)
	37	#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD \| 0x10)
	38	#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD \| 0x12)
	39	#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD \| 0x14)
	40	#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD \| 0x16)
	41
	42	#define TCS3414_CONTROL_ADC_VALID BIT(4)
	43	#define TCS3414_CONTROL_ADC_EN BIT(1)
	44	#define TCS3414_CONTROL_POWER BIT(0)
	45
	46	#define TCS3414_INTEG_MASK GENMASK(1, 0)
	47	#define TCS3414_INTEG_12MS 0x0
	48	#define TCS3414_INTEG_100MS 0x1
	49	#define TCS3414_INTEG_400MS 0x2
	50
	51	#define TCS3414_GAIN_MASK GENMASK(5, 4)
	52	#define TCS3414_GAIN_SHIFT 4
	53
	54	struct tcs3414_data {
	55	struct i2c_client *client;
	56	struct mutex lock;
	57	u8 control;
	58	u8 gain;
	59	u8 timing;
	60	u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
	61	};
	62
	63	#define TCS3414_CHANNEL(_color, _si, _addr) { \
	64	.type = IIO_INTENSITY, \
65	.modified = 1, \
66	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
67	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \| \
68	BIT(IIO_CHAN_INFO_INT_TIME), \
69	.channel2 = IIO_MOD_LIGHT_##_color, \
70	.address = _addr, \
71	.scan_index = _si, \
72	.scan_type = { \
73	.sign = 'u', \
74	.realbits = 16, \
75	.storagebits = 16, \
76	.endianness = IIO_CPU, \
77	}, \
78	}
79
80	/* scale factors: 1/gain */
81	static const int tcs3414_scales[][2] = {
82	{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
83	};
84
85	/* integration time in ms */
86	static const int tcs3414_times[] = { 12, 100, 400 };
87
88	static const struct iio_chan_spec tcs3414_channels[] = {
89	TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
90	TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
91	TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
92	TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
93	IIO_CHAN_SOFT_TIMESTAMP(4),
94	};
95
96	static int tcs3414_req_data(struct tcs3414_data *data)
97	{
98	int tries = 25;
99	int ret;
100
101	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
102	data->control \| TCS3414_CONTROL_ADC_EN);
103	if (ret < 0)
104	return ret;
105
106	while (tries--) {
107	ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
108	if (ret < 0)
109	return ret;
110	if (ret & TCS3414_CONTROL_ADC_VALID)
111	break;
112	msleep(20);
113	}
114
115	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
116	data->control);
117	if (ret < 0)
118	return ret;
119
120	if (tries < 0) {
121	dev_err(&data->client->dev, "data not ready\n");
122	return -EIO;
123	}
124
125	return 0;
126	}
127
128	static int tcs3414_read_raw(struct iio_dev *indio_dev,
129	struct iio_chan_spec const *chan,
130	int val, int val2, long mask)
131	{
132	struct tcs3414_data *data = iio_priv(indio_dev);
133	int i, ret;
134
135	switch (mask) {
136	case IIO_CHAN_INFO_RAW:
137	if (iio_buffer_enabled(indio_dev))
138	return -EBUSY;
139	mutex_lock(&data->lock);
140	ret = tcs3414_req_data(data);
141	if (ret < 0) {
142	mutex_unlock(&data->lock);
143	return ret;
144	}
145	ret = i2c_smbus_read_word_data(data->client, chan->address);
146	mutex_unlock(&data->lock);
147	if (ret < 0)
148	return ret;
149	*val = ret;
150	return IIO_VAL_INT;
151	case IIO_CHAN_INFO_SCALE:
2cdc560a RD	152	i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
2cdc560a RD	153	*val = tcs3414_scales[i][0];
a244e7b5 PM	154	*val2 = tcs3414_scales[i][1];
	155	return IIO_VAL_INT_PLUS_MICRO;
	156	case IIO_CHAN_INFO_INT_TIME:
	157	*val = 0;
	158	val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] 1000;
	159	return IIO_VAL_INT_PLUS_MICRO;
	160	}
	161	return -EINVAL;
	162	}
	163
	164	static int tcs3414_write_raw(struct iio_dev *indio_dev,
	165	struct iio_chan_spec const *chan,
	166	int val, int val2, long mask)
	167	{
	168	struct tcs3414_data *data = iio_priv(indio_dev);
	169	int i;
	170
	171	switch (mask) {
	172	case IIO_CHAN_INFO_SCALE:
	173	for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
	174	if (val == tcs3414_scales[i][0] &&
	175	val2 == tcs3414_scales[i][1]) {
	176	data->gain &= ~TCS3414_GAIN_MASK;
	177	data->gain \|= i << TCS3414_GAIN_SHIFT;
	178	return i2c_smbus_write_byte_data(
	179	data->client, TCS3414_GAIN,
	180	data->gain);
	181	}
	182	}
	183	return -EINVAL;
	184	case IIO_CHAN_INFO_INT_TIME:
	185	if (val != 0)
	186	return -EINVAL;
	187	for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
33361e56	188	if (val2 == tcs3414_times[i] * 1000) {
a244e7b5 PM	189	data->timing &= ~TCS3414_INTEG_MASK;
	190	data->timing \|= i;
	191	return i2c_smbus_write_byte_data(
	192	data->client, TCS3414_TIMING,
	193	data->timing);
	194	}
	195	}
	196	return -EINVAL;
	197	default:
	198	return -EINVAL;
	199	}
	200	}
	201
	202	static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
	203	{
	204	struct iio_poll_func *pf = p;
	205	struct iio_dev *indio_dev = pf->indio_dev;
	206	struct tcs3414_data *data = iio_priv(indio_dev);
	207	int i, j = 0;
	208
	209	for_each_set_bit(i, indio_dev->active_scan_mask,
	210	indio_dev->masklength) {
	211	int ret = i2c_smbus_read_word_data(data->client,
	212	TCS3414_DATA_GREEN + 2*i);
	213	if (ret < 0)
	214	goto done;
	215
	216	data->buffer[j++] = ret;
	217	}
	218
	219	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
	220	iio_get_time_ns());
	221
	222	done:
	223	iio_trigger_notify_done(indio_dev->trig);
	224
	225	return IRQ_HANDLED;
	226	}
	227
	228	static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
	229	static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
	230
	231	static struct attribute *tcs3414_attributes[] = {
	232	&iio_const_attr_scale_available.dev_attr.attr,
	233	&iio_const_attr_integration_time_available.dev_attr.attr,
	234	NULL
	235	};
	236
	237	static const struct attribute_group tcs3414_attribute_group = {
	238	.attrs = tcs3414_attributes,
	239	};
	240
	241	static const struct iio_info tcs3414_info = {
	242	.read_raw = tcs3414_read_raw,
	243	.write_raw = tcs3414_write_raw,
	244	.attrs = &tcs3414_attribute_group,
	245	.driver_module = THIS_MODULE,
	246	};
	247
	248	static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
	249	{
	250	struct tcs3414_data *data = iio_priv(indio_dev);
	251
	252	data->control \|= TCS3414_CONTROL_ADC_EN;
253	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
254	data->control);
255	}
256
257	static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
258	{
259	struct tcs3414_data *data = iio_priv(indio_dev);
260	int ret;
261
262	ret = iio_triggered_buffer_predisable(indio_dev);
263	if (ret < 0)
264	return ret;
265
266	data->control &= ~TCS3414_CONTROL_ADC_EN;
267	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
268	data->control);
269	}
270
271	static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
272	.preenable = tcs3414_buffer_preenable,
273	.postenable = &iio_triggered_buffer_postenable,
274	.predisable = tcs3414_buffer_predisable,
275	};
276
277	static int tcs3414_probe(struct i2c_client *client,
278	const struct i2c_device_id *id)
279	{
280	struct tcs3414_data *data;
281	struct iio_dev *indio_dev;
282	int ret;
283
284	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
285	if (indio_dev == NULL)
286	return -ENOMEM;
287
288	data = iio_priv(indio_dev);
289	i2c_set_clientdata(client, indio_dev);
290	data->client = client;
291	mutex_init(&data->lock);
292
293	indio_dev->dev.parent = &client->dev;
294	indio_dev->info = &tcs3414_info;
295	indio_dev->name = TCS3414_DRV_NAME;
296	indio_dev->channels = tcs3414_channels;
297	indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
298	indio_dev->modes = INDIO_DIRECT_MODE;
299
300	ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
301	if (ret < 0)
302	return ret;
303
304	switch (ret & 0xf0) {
305	case 0x00:
306	dev_info(&client->dev, "TCS3404 found\n");
307	break;
308	case 0x10:
309	dev_info(&client->dev, "TCS3413/14/15/16 found\n");
310	break;
311	default:
312	return -ENODEV;
313	}
314
315	data->control = TCS3414_CONTROL_POWER;
316	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
317	data->control);
318	if (ret < 0)
319	return ret;
320
321	data->timing = TCS3414_INTEG_12MS; /* free running */
322	ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
323	data->timing);
324	if (ret < 0)
325	return ret;
326
327	ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
328	if (ret < 0)
329	return ret;
330	data->gain = ret;
331
332	ret = iio_triggered_buffer_setup(indio_dev, NULL,
333	tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
334	if (ret < 0)
335	return ret;
336
337	ret = iio_device_register(indio_dev);
338	if (ret < 0)
339	goto buffer_cleanup;
340
341	return 0;
342
343	buffer_cleanup:
344	iio_triggered_buffer_cleanup(indio_dev);
345	return ret;
346	}
347
348	static int tcs3414_powerdown(struct tcs3414_data *data)
349	{
350	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
351	data->control & ~(TCS3414_CONTROL_POWER \|
352	TCS3414_CONTROL_ADC_EN));
353	}
354
355	static int tcs3414_remove(struct i2c_client *client)
356	{
357	struct iio_dev *indio_dev = i2c_get_clientdata(client);
358
359	iio_device_unregister(indio_dev);
360	iio_triggered_buffer_cleanup(indio_dev);
361	tcs3414_powerdown(iio_priv(indio_dev));
362
363	return 0;
364	}
365
366	#ifdef CONFIG_PM_SLEEP
367	static int tcs3414_suspend(struct device *dev)
368	{
369	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
370	to_i2c_client(dev)));
371	return tcs3414_powerdown(data);
372	}
373
374	static int tcs3414_resume(struct device *dev)
375	{
376	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
377	to_i2c_client(dev)));
378	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
379	data->control);
380	}
381	#endif
382
383	static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
384
385	static const struct i2c_device_id tcs3414_id[] = {
386	{ "tcs3414", 0 },
387	{ }
388	};
389	MODULE_DEVICE_TABLE(i2c, tcs3414_id);
390
391	static struct i2c_driver tcs3414_driver = {
392	.driver = {
393	.name = TCS3414_DRV_NAME,
394	.pm = &tcs3414_pm_ops,
395	.owner = THIS_MODULE,
396	},
397	.probe = tcs3414_probe,
398	.remove = tcs3414_remove,
399	.id_table = tcs3414_id,
400	};
401	module_i2c_driver(tcs3414_driver);
402
403	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
404	MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
405	MODULE_LICENSE("GPL");