1 // SPDX-License-Identifier: GPL-2.0-only
3 * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
5 * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
7 * Color light sensor with 16-bit channels for red, green, blue, clear);
8 * 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
11 * Datasheet: http://ams.com/eng/content/download/319364/1117183/file/TCS3472_Datasheet_EN_v2.pdf
16 #include <linux/module.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/events.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/buffer.h>
26 #include <linux/iio/triggered_buffer.h>
28 #define TCS3472_DRV_NAME "tcs3472"
30 #define TCS3472_COMMAND BIT(7)
31 #define TCS3472_AUTO_INCR BIT(5)
32 #define TCS3472_SPECIAL_FUNC (BIT(5) | BIT(6))
34 #define TCS3472_INTR_CLEAR (TCS3472_COMMAND | TCS3472_SPECIAL_FUNC | 0x06)
36 #define TCS3472_ENABLE (TCS3472_COMMAND | 0x00)
37 #define TCS3472_ATIME (TCS3472_COMMAND | 0x01)
38 #define TCS3472_WTIME (TCS3472_COMMAND | 0x03)
39 #define TCS3472_AILT (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x04)
40 #define TCS3472_AIHT (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x06)
41 #define TCS3472_PERS (TCS3472_COMMAND | 0x0c)
42 #define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d)
43 #define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f)
44 #define TCS3472_ID (TCS3472_COMMAND | 0x12)
45 #define TCS3472_STATUS (TCS3472_COMMAND | 0x13)
46 #define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14)
47 #define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16)
48 #define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18)
49 #define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a)
51 #define TCS3472_STATUS_AINT BIT(4)
52 #define TCS3472_STATUS_AVALID BIT(0)
53 #define TCS3472_ENABLE_AIEN BIT(4)
54 #define TCS3472_ENABLE_AEN BIT(1)
55 #define TCS3472_ENABLE_PON BIT(0)
56 #define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1))
59 struct i2c_client *client;
67 u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
70 static const struct iio_event_spec tcs3472_events[] = {
72 .type = IIO_EV_TYPE_THRESH,
73 .dir = IIO_EV_DIR_RISING,
74 .mask_separate = BIT(IIO_EV_INFO_VALUE),
76 .type = IIO_EV_TYPE_THRESH,
77 .dir = IIO_EV_DIR_FALLING,
78 .mask_separate = BIT(IIO_EV_INFO_VALUE),
80 .type = IIO_EV_TYPE_THRESH,
81 .dir = IIO_EV_DIR_EITHER,
82 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
83 BIT(IIO_EV_INFO_PERIOD),
87 #define TCS3472_CHANNEL(_color, _si, _addr) { \
88 .type = IIO_INTENSITY, \
90 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
91 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \
92 BIT(IIO_CHAN_INFO_INT_TIME), \
93 .channel2 = IIO_MOD_LIGHT_##_color, \
100 .endianness = IIO_CPU, \
102 .event_spec = _si ? NULL : tcs3472_events, \
103 .num_event_specs = _si ? 0 : ARRAY_SIZE(tcs3472_events), \
106 static const int tcs3472_agains[] = { 1, 4, 16, 60 };
108 static const struct iio_chan_spec tcs3472_channels[] = {
109 TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
110 TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
111 TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
112 TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
113 IIO_CHAN_SOFT_TIMESTAMP(4),
116 static int tcs3472_req_data(struct tcs3472_data *data)
122 ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
125 if (ret & TCS3472_STATUS_AVALID)
131 dev_err(&data->client->dev, "data not ready\n");
138 static int tcs3472_read_raw(struct iio_dev *indio_dev,
139 struct iio_chan_spec const *chan,
140 int *val, int *val2, long mask)
142 struct tcs3472_data *data = iio_priv(indio_dev);
146 case IIO_CHAN_INFO_RAW:
147 ret = iio_device_claim_direct_mode(indio_dev);
150 ret = tcs3472_req_data(data);
152 iio_device_release_direct_mode(indio_dev);
155 ret = i2c_smbus_read_word_data(data->client, chan->address);
156 iio_device_release_direct_mode(indio_dev);
161 case IIO_CHAN_INFO_CALIBSCALE:
162 *val = tcs3472_agains[data->control &
163 TCS3472_CONTROL_AGAIN_MASK];
165 case IIO_CHAN_INFO_INT_TIME:
167 *val2 = (256 - data->atime) * 2400;
168 return IIO_VAL_INT_PLUS_MICRO;
173 static int tcs3472_write_raw(struct iio_dev *indio_dev,
174 struct iio_chan_spec const *chan,
175 int val, int val2, long mask)
177 struct tcs3472_data *data = iio_priv(indio_dev);
181 case IIO_CHAN_INFO_CALIBSCALE:
184 for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) {
185 if (val == tcs3472_agains[i]) {
186 data->control &= ~TCS3472_CONTROL_AGAIN_MASK;
188 return i2c_smbus_write_byte_data(
189 data->client, TCS3472_CONTROL,
194 case IIO_CHAN_INFO_INT_TIME:
197 for (i = 0; i < 256; i++) {
198 if (val2 == (256 - i) * 2400) {
200 return i2c_smbus_write_byte_data(
201 data->client, TCS3472_ATIME,
212 * Translation from APERS field value to the number of consecutive out-of-range
213 * clear channel values before an interrupt is generated
215 static const int tcs3472_intr_pers[] = {
216 0, 1, 2, 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60
219 static int tcs3472_read_event(struct iio_dev *indio_dev,
220 const struct iio_chan_spec *chan, enum iio_event_type type,
221 enum iio_event_direction dir, enum iio_event_info info, int *val,
224 struct tcs3472_data *data = iio_priv(indio_dev);
228 mutex_lock(&data->lock);
231 case IIO_EV_INFO_VALUE:
232 *val = (dir == IIO_EV_DIR_RISING) ?
233 data->high_thresh : data->low_thresh;
236 case IIO_EV_INFO_PERIOD:
237 period = (256 - data->atime) * 2400 *
238 tcs3472_intr_pers[data->apers];
239 *val = period / USEC_PER_SEC;
240 *val2 = period % USEC_PER_SEC;
241 ret = IIO_VAL_INT_PLUS_MICRO;
248 mutex_unlock(&data->lock);
253 static int tcs3472_write_event(struct iio_dev *indio_dev,
254 const struct iio_chan_spec *chan, enum iio_event_type type,
255 enum iio_event_direction dir, enum iio_event_info info, int val,
258 struct tcs3472_data *data = iio_priv(indio_dev);
264 mutex_lock(&data->lock);
266 case IIO_EV_INFO_VALUE:
268 case IIO_EV_DIR_RISING:
269 command = TCS3472_AIHT;
271 case IIO_EV_DIR_FALLING:
272 command = TCS3472_AILT;
278 ret = i2c_smbus_write_word_data(data->client, command, val);
282 if (dir == IIO_EV_DIR_RISING)
283 data->high_thresh = val;
285 data->low_thresh = val;
287 case IIO_EV_INFO_PERIOD:
288 period = val * USEC_PER_SEC + val2;
289 for (i = 1; i < ARRAY_SIZE(tcs3472_intr_pers) - 1; i++) {
290 if (period <= (256 - data->atime) * 2400 *
291 tcs3472_intr_pers[i])
294 ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS, i);
305 mutex_unlock(&data->lock);
310 static int tcs3472_read_event_config(struct iio_dev *indio_dev,
311 const struct iio_chan_spec *chan, enum iio_event_type type,
312 enum iio_event_direction dir)
314 struct tcs3472_data *data = iio_priv(indio_dev);
317 mutex_lock(&data->lock);
318 ret = !!(data->enable & TCS3472_ENABLE_AIEN);
319 mutex_unlock(&data->lock);
324 static int tcs3472_write_event_config(struct iio_dev *indio_dev,
325 const struct iio_chan_spec *chan, enum iio_event_type type,
326 enum iio_event_direction dir, int state)
328 struct tcs3472_data *data = iio_priv(indio_dev);
332 mutex_lock(&data->lock);
334 enable_old = data->enable;
337 data->enable |= TCS3472_ENABLE_AIEN;
339 data->enable &= ~TCS3472_ENABLE_AIEN;
341 if (enable_old != data->enable) {
342 ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
345 data->enable = enable_old;
347 mutex_unlock(&data->lock);
352 static irqreturn_t tcs3472_event_handler(int irq, void *priv)
354 struct iio_dev *indio_dev = priv;
355 struct tcs3472_data *data = iio_priv(indio_dev);
358 ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
359 if (ret >= 0 && (ret & TCS3472_STATUS_AINT)) {
360 iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
363 iio_get_time_ns(indio_dev));
365 i2c_smbus_read_byte_data(data->client, TCS3472_INTR_CLEAR);
371 static irqreturn_t tcs3472_trigger_handler(int irq, void *p)
373 struct iio_poll_func *pf = p;
374 struct iio_dev *indio_dev = pf->indio_dev;
375 struct tcs3472_data *data = iio_priv(indio_dev);
378 int ret = tcs3472_req_data(data);
382 for_each_set_bit(i, indio_dev->active_scan_mask,
383 indio_dev->masklength) {
384 ret = i2c_smbus_read_word_data(data->client,
385 TCS3472_CDATA + 2*i);
389 data->buffer[j++] = ret;
392 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
393 iio_get_time_ns(indio_dev));
396 iio_trigger_notify_done(indio_dev->trig);
401 static ssize_t tcs3472_show_int_time_available(struct device *dev,
402 struct device_attribute *attr,
408 for (i = 1; i <= 256; i++)
409 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
412 /* replace trailing space by newline */
418 static IIO_CONST_ATTR(calibscale_available, "1 4 16 60");
419 static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available);
421 static struct attribute *tcs3472_attributes[] = {
422 &iio_const_attr_calibscale_available.dev_attr.attr,
423 &iio_dev_attr_integration_time_available.dev_attr.attr,
427 static const struct attribute_group tcs3472_attribute_group = {
428 .attrs = tcs3472_attributes,
431 static const struct iio_info tcs3472_info = {
432 .read_raw = tcs3472_read_raw,
433 .write_raw = tcs3472_write_raw,
434 .read_event_value = tcs3472_read_event,
435 .write_event_value = tcs3472_write_event,
436 .read_event_config = tcs3472_read_event_config,
437 .write_event_config = tcs3472_write_event_config,
438 .attrs = &tcs3472_attribute_group,
441 static int tcs3472_probe(struct i2c_client *client,
442 const struct i2c_device_id *id)
444 struct tcs3472_data *data;
445 struct iio_dev *indio_dev;
448 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
449 if (indio_dev == NULL)
452 data = iio_priv(indio_dev);
453 i2c_set_clientdata(client, indio_dev);
454 data->client = client;
455 mutex_init(&data->lock);
457 indio_dev->info = &tcs3472_info;
458 indio_dev->name = TCS3472_DRV_NAME;
459 indio_dev->channels = tcs3472_channels;
460 indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);
461 indio_dev->modes = INDIO_DIRECT_MODE;
463 ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);
468 dev_info(&client->dev, "TCS34721/34725 found\n");
469 else if (ret == 0x4d)
470 dev_info(&client->dev, "TCS34723/34727 found\n");
474 ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);
479 ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);
484 ret = i2c_smbus_read_word_data(data->client, TCS3472_AILT);
487 data->low_thresh = ret;
489 ret = i2c_smbus_read_word_data(data->client, TCS3472_AIHT);
492 data->high_thresh = ret;
495 ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS,
500 ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);
505 data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN;
506 data->enable &= ~TCS3472_ENABLE_AIEN;
507 ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
512 ret = iio_triggered_buffer_setup(indio_dev, NULL,
513 tcs3472_trigger_handler, NULL);
518 ret = request_threaded_irq(client->irq, NULL,
519 tcs3472_event_handler,
520 IRQF_TRIGGER_FALLING | IRQF_SHARED |
522 client->name, indio_dev);
527 ret = iio_device_register(indio_dev);
534 free_irq(client->irq, indio_dev);
536 iio_triggered_buffer_cleanup(indio_dev);
540 static int tcs3472_powerdown(struct tcs3472_data *data)
543 u8 enable_mask = TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON;
545 mutex_lock(&data->lock);
547 ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
548 data->enable & ~enable_mask);
550 data->enable &= ~enable_mask;
552 mutex_unlock(&data->lock);
557 static int tcs3472_remove(struct i2c_client *client)
559 struct iio_dev *indio_dev = i2c_get_clientdata(client);
561 iio_device_unregister(indio_dev);
562 free_irq(client->irq, indio_dev);
563 iio_triggered_buffer_cleanup(indio_dev);
564 tcs3472_powerdown(iio_priv(indio_dev));
569 #ifdef CONFIG_PM_SLEEP
570 static int tcs3472_suspend(struct device *dev)
572 struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
573 to_i2c_client(dev)));
574 return tcs3472_powerdown(data);
577 static int tcs3472_resume(struct device *dev)
579 struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
580 to_i2c_client(dev)));
582 u8 enable_mask = TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON;
584 mutex_lock(&data->lock);
586 ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
587 data->enable | enable_mask);
589 data->enable |= enable_mask;
591 mutex_unlock(&data->lock);
597 static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);
599 static const struct i2c_device_id tcs3472_id[] = {
603 MODULE_DEVICE_TABLE(i2c, tcs3472_id);
605 static struct i2c_driver tcs3472_driver = {
607 .name = TCS3472_DRV_NAME,
608 .pm = &tcs3472_pm_ops,
610 .probe = tcs3472_probe,
611 .remove = tcs3472_remove,
612 .id_table = tcs3472_id,
614 module_i2c_driver(tcs3472_driver);
616 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
617 MODULE_DESCRIPTION("TCS3472 color light sensors driver");
618 MODULE_LICENSE("GPL");