1 // SPDX-License-Identifier: GPL-2.0-only
3  * srf08.c - Support for Devantech SRFxx ultrasonic ranger
7  * Copyright (c) 2016, 2017 Andreas Klinger <ak@it-klinger.de>
10  * https://www.robot-electronics.co.uk/htm/srf08tech.html
11  * https://www.robot-electronics.co.uk/htm/srf10tech.htm
12  * https://www.robot-electronics.co.uk/htm/srf02tech.htm
35 #define SRF08_CMD_RANGING_CM	0x51	/* Ranging Mode - Result in cm */
72 	/* Sensor-Type */
75 	/* Chip-specific information */
125 	struct i2c_client *client = data->client;  in srf08_read_ranging()
129 	mutex_lock(&data->lock);  in srf08_read_ranging()
131 	ret = i2c_smbus_write_byte_data(data->client,  in srf08_read_ranging()
134 		dev_err(&client->dev, "write command - err: %d\n", ret);  in srf08_read_ranging()
135 		mutex_unlock(&data->lock);  in srf08_read_ranging()
149 	waittime = 1 + data->range_mm / 172;  in srf08_read_ranging()
152 		ret = i2c_smbus_read_byte_data(data->client,  in srf08_read_ranging()
162 		dev_err(&client->dev, "device not ready\n");  in srf08_read_ranging()
163 		mutex_unlock(&data->lock);  in srf08_read_ranging()
164 		return -EIO;  in srf08_read_ranging()
167 	ret = i2c_smbus_read_word_swapped(data->client,  in srf08_read_ranging()
170 		dev_err(&client->dev, "cannot read distance: ret=%d\n", ret);  in srf08_read_ranging()
171 		mutex_unlock(&data->lock);  in srf08_read_ranging()
175 	mutex_unlock(&data->lock);  in srf08_read_ranging()
183 	struct iio_dev *indio_dev = pf->indio_dev;  in srf08_trigger_handler()
191 	mutex_lock(&data->lock);  in srf08_trigger_handler()
193 	data->scan.chan = sensor_data;  in srf08_trigger_handler()
195 					   &data->scan, pf->timestamp);  in srf08_trigger_handler()
197 	mutex_unlock(&data->lock);  in srf08_trigger_handler()
199 	iio_trigger_notify_done(indio_dev->trig);  in srf08_trigger_handler()
210 	if (channel->type != IIO_DISTANCE)  in srf08_read_raw()
211 		return -EINVAL;  in srf08_read_raw()
226 		return -EINVAL;  in srf08_read_raw()
245 	return sprintf(buf, "%d.%03d\n", data->range_mm / 1000,  in srf08_show_range_mm()
246 						data->range_mm % 1000);  in srf08_show_range_mm()
263 	struct i2c_client *client = data->client;  in srf08_write_range_mm()
267 	ret = val / 43 - 1;  in srf08_write_range_mm()
271 		return -EINVAL;  in srf08_write_range_mm()
275 	mutex_lock(&data->lock);  in srf08_write_range_mm()
279 		dev_err(&client->dev, "write_range - err: %d\n", ret);  in srf08_write_range_mm()
280 		mutex_unlock(&data->lock);  in srf08_write_range_mm()
284 	data->range_mm = val;  in srf08_write_range_mm()
286 	mutex_unlock(&data->lock);  in srf08_write_range_mm()
321 	for (i = 0; i < data->chip_info->num_sensitivity_avail; i++)  in srf08_show_sensitivity_available()
322 		if (data->chip_info->sensitivity_avail[i])  in srf08_show_sensitivity_available()
324 				data->chip_info->sensitivity_avail[i]);  in srf08_show_sensitivity_available()
341 	len = sprintf(buf, "%d\n", data->sensitivity);  in srf08_show_sensitivity()
349 	struct i2c_client *client = data->client;  in srf08_write_sensitivity()
354 		return -EINVAL;  in srf08_write_sensitivity()
356 	for (i = 0; i < data->chip_info->num_sensitivity_avail; i++)  in srf08_write_sensitivity()
357 		if (val == data->chip_info->sensitivity_avail[i]) {  in srf08_write_sensitivity()
362 	if (i >= data->chip_info->num_sensitivity_avail)  in srf08_write_sensitivity()
363 		return -EINVAL;  in srf08_write_sensitivity()
365 	mutex_lock(&data->lock);  in srf08_write_sensitivity()
369 		dev_err(&client->dev, "write_sensitivity - err: %d\n", ret);  in srf08_write_sensitivity()
370 		mutex_unlock(&data->lock);  in srf08_write_sensitivity()
374 	data->sensitivity = val;  in srf08_write_sensitivity()
376 	mutex_unlock(&data->lock);  in srf08_write_sensitivity()
453 	if (!i2c_check_functionality(client->adapter,  in srf08_probe()
457 		return -ENODEV;  in srf08_probe()
459 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in srf08_probe()
461 		return -ENOMEM;  in srf08_probe()
465 	data->client = client;  in srf08_probe()
466 	data->sensor_type = (enum srf08_sensor_type)id->driver_data;  in srf08_probe()
468 	switch (data->sensor_type) {  in srf08_probe()
470 		data->chip_info = &srf02_chip_info;  in srf08_probe()
471 		indio_dev->info = &srf02_info;  in srf08_probe()
474 		data->chip_info = &srf08_chip_info;  in srf08_probe()
475 		indio_dev->info = &srf08_info;  in srf08_probe()
478 		data->chip_info = &srf10_chip_info;  in srf08_probe()
479 		indio_dev->info = &srf08_info;  in srf08_probe()
482 		return -EINVAL;  in srf08_probe()
485 	indio_dev->name = id->name;  in srf08_probe()
486 	indio_dev->modes = INDIO_DIRECT_MODE;  in srf08_probe()
487 	indio_dev->channels = srf08_channels;  in srf08_probe()
488 	indio_dev->num_channels = ARRAY_SIZE(srf08_channels);  in srf08_probe()
490 	mutex_init(&data->lock);  in srf08_probe()
492 	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,  in srf08_probe()
495 		dev_err(&client->dev, "setup of iio triggered buffer failed\n");  in srf08_probe()
499 	if (data->chip_info->range_default) {  in srf08_probe()
508 					data->chip_info->range_default);  in srf08_probe()
513 	if (data->chip_info->sensitivity_default) {  in srf08_probe()
522 				data->chip_info->sensitivity_default);  in srf08_probe()
527 	return devm_iio_device_register(&client->dev, indio_dev);  in srf08_probe()
557 MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");