1 // SPDX-License-Identifier: GPL-2.0+
3  * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
17 #include <linux/delay.h>
49 	} scan;  member
128 		.scan_index = -1,
137 	int tmp = (~mask & data->config) | val;  in hdc100x_update_config()
140 	ret = i2c_smbus_write_word_swapped(data->client,  in hdc100x_update_config()
143 		data->config = tmp;  in hdc100x_update_config()
151 	int ret = -EINVAL;  in hdc100x_set_it_time()
160 				data->adc_int_us[chan] = val2;  in hdc100x_set_it_time()
171 	struct i2c_client *client = data->client;  in hdc100x_get_measurement()
172 	int delay = data->adc_int_us[chan->address] + 1*USEC_PER_MSEC;  in hdc100x_get_measurement()  local
177 	ret = i2c_smbus_write_byte(client, chan->address);  in hdc100x_get_measurement()
179 		dev_err(&client->dev, "cannot start measurement");  in hdc100x_get_measurement()
184 	usleep_range(delay, delay + 1000);  in hdc100x_get_measurement()
187 	ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));  in hdc100x_get_measurement()
189 		dev_err(&client->dev, "cannot read sensor data\n");  in hdc100x_get_measurement()
197 	return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);  in hdc100x_get_heater_status()
210 		guard(mutex)(&data->lock);  in hdc100x_read_raw()
211 		if (chan->type == IIO_CURRENT) {  in hdc100x_read_raw()
216 			return -EBUSY;  in hdc100x_read_raw()
227 		*val2 = data->adc_int_us[chan->address];  in hdc100x_read_raw()
230 		if (chan->type == IIO_TEMP) {  in hdc100x_read_raw()
241 		*val = -15887;  in hdc100x_read_raw()
245 		return -EINVAL;  in hdc100x_read_raw()
258 			return -EINVAL;  in hdc100x_write_raw()
260 		guard(mutex)(&data->lock);  in hdc100x_write_raw()
261 		return hdc100x_set_it_time(data, chan->address, val2);  in hdc100x_write_raw()
264 		if (chan->type != IIO_CURRENT || val2 != 0)  in hdc100x_write_raw()
265 			return -EINVAL;  in hdc100x_write_raw()
267 		guard(mutex)(&data->lock);  in hdc100x_write_raw()
272 		return -EINVAL;  in hdc100x_write_raw()
281 	guard(mutex)(&data->lock);  in hdc100x_buffer_postenable()
290 	guard(mutex)(&data->lock);  in hdc100x_buffer_predisable()
302 	struct iio_dev *indio_dev = pf->indio_dev;  in hdc100x_trigger_handler()
304 	struct i2c_client *client = data->client;  in hdc100x_trigger_handler()
305 	int delay = data->adc_int_us[0] + data->adc_int_us[1] + 2*USEC_PER_MSEC;  in hdc100x_trigger_handler()  local
309 	mutex_lock(&data->lock);  in hdc100x_trigger_handler()
312 		dev_err(&client->dev, "cannot start measurement\n");  in hdc100x_trigger_handler()
315 	usleep_range(delay, delay + 1000);  in hdc100x_trigger_handler()
317 	ret = i2c_master_recv(client, (u8 *)data->scan.channels, 4);  in hdc100x_trigger_handler()
319 		dev_err(&client->dev, "cannot read sensor data\n");  in hdc100x_trigger_handler()
323 	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,  in hdc100x_trigger_handler()
326 	mutex_unlock(&data->lock);  in hdc100x_trigger_handler()
327 	iio_trigger_notify_done(indio_dev->trig);  in hdc100x_trigger_handler()
344 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |  in hdc100x_probe()
346 		return -EOPNOTSUPP;  in hdc100x_probe()
348 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in hdc100x_probe()
350 		return -ENOMEM;  in hdc100x_probe()
354 	data->client = client;  in hdc100x_probe()
355 	mutex_init(&data->lock);  in hdc100x_probe()
357 	indio_dev->name = dev_name(&client->dev);  in hdc100x_probe()
358 	indio_dev->modes = INDIO_DIRECT_MODE;  in hdc100x_probe()
359 	indio_dev->info = &hdc100x_info;  in hdc100x_probe()
361 	indio_dev->channels = hdc100x_channels;  in hdc100x_probe()
362 	indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);  in hdc100x_probe()
363 	indio_dev->available_scan_masks = hdc100x_scan_masks;  in hdc100x_probe()
370 	ret = devm_iio_triggered_buffer_setup(&client->dev,  in hdc100x_probe()
375 		dev_err(&client->dev, "iio triggered buffer setup failed\n");  in hdc100x_probe()
379 	return devm_iio_device_register(&client->dev, indio_dev);  in hdc100x_probe()