1 // SPDX-License-Identifier: GPL-2.0-only
3  * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
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,
125 	while (tries--) {  in tcs3472_req_data()
126 		ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);  in tcs3472_req_data()
135 		dev_err(&data->client->dev, "data not ready\n");  in tcs3472_req_data()
136 		return -EIO;  in tcs3472_req_data()
159 		ret = i2c_smbus_read_word_data(data->client, chan->address);  in tcs3472_read_raw()
166 		*val = tcs3472_agains[data->control &  in tcs3472_read_raw()
171 		*val2 = (256 - data->atime) * 2400;  in tcs3472_read_raw()
174 	return -EINVAL;  in tcs3472_read_raw()
187 			return -EINVAL;  in tcs3472_write_raw()
190 				data->control &= ~TCS3472_CONTROL_AGAIN_MASK;  in tcs3472_write_raw()
191 				data->control |= i;  in tcs3472_write_raw()
193 					data->client, TCS3472_CONTROL,  in tcs3472_write_raw()
194 					data->control);  in tcs3472_write_raw()
197 		return -EINVAL;  in tcs3472_write_raw()
200 			return -EINVAL;  in tcs3472_write_raw()
202 			if (val2 == (256 - i) * 2400) {  in tcs3472_write_raw()
203 				data->atime = i;  in tcs3472_write_raw()
205 					data->client, TCS3472_ATIME,  in tcs3472_write_raw()
206 					data->atime);  in tcs3472_write_raw()
210 		return -EINVAL;  in tcs3472_write_raw()
212 	return -EINVAL;  in tcs3472_write_raw()
216  * Translation from APERS field value to the number of consecutive out-of-range
232 	mutex_lock(&data->lock);  in tcs3472_read_event()
237 			data->high_thresh : data->low_thresh;  in tcs3472_read_event()
241 		period = (256 - data->atime) * 2400 *  in tcs3472_read_event()
242 			tcs3472_intr_pers[data->apers];  in tcs3472_read_event()
248 		ret = -EINVAL;  in tcs3472_read_event()
252 	mutex_unlock(&data->lock);  in tcs3472_read_event()
268 	mutex_lock(&data->lock);  in tcs3472_write_event()
279 			ret = -EINVAL;  in tcs3472_write_event()
282 		ret = i2c_smbus_write_word_data(data->client, command, val);  in tcs3472_write_event()
287 			data->high_thresh = val;  in tcs3472_write_event()
289 			data->low_thresh = val;  in tcs3472_write_event()
293 		for (i = 1; i < ARRAY_SIZE(tcs3472_intr_pers) - 1; i++) {  in tcs3472_write_event()
294 			if (period <= (256 - data->atime) * 2400 *  in tcs3472_write_event()
298 		ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS, i);  in tcs3472_write_event()
302 		data->apers = i;  in tcs3472_write_event()
305 		ret = -EINVAL;  in tcs3472_write_event()
309 	mutex_unlock(&data->lock);  in tcs3472_write_event()
321 	mutex_lock(&data->lock);  in tcs3472_read_event_config()
322 	ret = !!(data->enable & TCS3472_ENABLE_AIEN);  in tcs3472_read_event_config()
323 	mutex_unlock(&data->lock);  in tcs3472_read_event_config()
336 	mutex_lock(&data->lock);  in tcs3472_write_event_config()
338 	enable_old = data->enable;  in tcs3472_write_event_config()
341 		data->enable |= TCS3472_ENABLE_AIEN;  in tcs3472_write_event_config()
343 		data->enable &= ~TCS3472_ENABLE_AIEN;  in tcs3472_write_event_config()
345 	if (enable_old != data->enable) {  in tcs3472_write_event_config()
346 		ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,  in tcs3472_write_event_config()
347 						data->enable);  in tcs3472_write_event_config()
349 			data->enable = enable_old;  in tcs3472_write_event_config()
351 	mutex_unlock(&data->lock);  in tcs3472_write_event_config()
362 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);  in tcs3472_event_handler()
369 		i2c_smbus_read_byte_data(data->client, TCS3472_INTR_CLEAR);  in tcs3472_event_handler()
378 	struct iio_dev *indio_dev = pf->indio_dev;  in tcs3472_trigger_handler()
387 		ret = i2c_smbus_read_word_data(data->client,  in tcs3472_trigger_handler()
392 		data->scan.chans[j++] = ret;  in tcs3472_trigger_handler()
395 	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,  in tcs3472_trigger_handler()
399 	iio_trigger_notify_done(indio_dev->trig);  in tcs3472_trigger_handler()
412 		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",  in tcs3472_show_int_time_available()
416 	buf[len - 1] = '\n';  in tcs3472_show_int_time_available()
450 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in tcs3472_probe()
452 		return -ENOMEM;  in tcs3472_probe()
456 	data->client = client;  in tcs3472_probe()
457 	mutex_init(&data->lock);  in tcs3472_probe()
459 	indio_dev->info = &tcs3472_info;  in tcs3472_probe()
460 	indio_dev->name = TCS3472_DRV_NAME;  in tcs3472_probe()
461 	indio_dev->channels = tcs3472_channels;  in tcs3472_probe()
462 	indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);  in tcs3472_probe()
463 	indio_dev->modes = INDIO_DIRECT_MODE;  in tcs3472_probe()
465 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);  in tcs3472_probe()
470 		dev_info(&client->dev, "TCS34721/34725 found\n");  in tcs3472_probe()
472 		dev_info(&client->dev, "TCS34723/34727 found\n");  in tcs3472_probe()
474 		return -ENODEV;  in tcs3472_probe()
476 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);  in tcs3472_probe()
479 	data->control = ret;  in tcs3472_probe()
481 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);  in tcs3472_probe()
484 	data->atime = ret;  in tcs3472_probe()
486 	ret = i2c_smbus_read_word_data(data->client, TCS3472_AILT);  in tcs3472_probe()
489 	data->low_thresh = ret;  in tcs3472_probe()
491 	ret = i2c_smbus_read_word_data(data->client, TCS3472_AIHT);  in tcs3472_probe()
494 	data->high_thresh = ret;  in tcs3472_probe()
496 	data->apers = 1;  in tcs3472_probe()
497 	ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS,  in tcs3472_probe()
498 					data->apers);  in tcs3472_probe()
502 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);  in tcs3472_probe()
507 	data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN;  in tcs3472_probe()
508 	data->enable &= ~TCS3472_ENABLE_AIEN;  in tcs3472_probe()
509 	ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,  in tcs3472_probe()
510 		data->enable);  in tcs3472_probe()
519 	if (client->irq) {  in tcs3472_probe()
520 		ret = request_threaded_irq(client->irq, NULL,  in tcs3472_probe()
524 					   client->name, indio_dev);  in tcs3472_probe()
536 	if (client->irq)  in tcs3472_probe()
537 		free_irq(client->irq, indio_dev);  in tcs3472_probe()
548 	mutex_lock(&data->lock);  in tcs3472_powerdown()
550 	ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,  in tcs3472_powerdown()
551 		data->enable & ~enable_mask);  in tcs3472_powerdown()
553 		data->enable &= ~enable_mask;  in tcs3472_powerdown()
555 	mutex_unlock(&data->lock);  in tcs3472_powerdown()
565 	if (client->irq)  in tcs3472_remove()
566 		free_irq(client->irq, indio_dev);  in tcs3472_remove()
585 	mutex_lock(&data->lock);  in tcs3472_resume()
587 	ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,  in tcs3472_resume()
588 		data->enable | enable_mask);  in tcs3472_resume()
590 		data->enable |= enable_mask;  in tcs3472_resume()
592 	mutex_unlock(&data->lock);  in tcs3472_resume()
618 MODULE_DESCRIPTION("TCS3472 color light sensors driver");