1 // SPDX-License-Identifier: GPL-2.0-only
7  * 7-bit I2C address: 0x5C.
10 #include <linux/delay.h>
39 	} scan;  member
81 	while (nr_bytes--) {  in am2315_crc()
118 	am2315_ping(data->client);  in am2315_read_data()
120 	mutex_lock(&data->lock);  in am2315_read_data()
121 	ret = i2c_master_send(data->client, tx_buf, sizeof(tx_buf));  in am2315_read_data()
123 		dev_err(&data->client->dev, "failed to send read request\n");  in am2315_read_data()
126 	/* Wait 2-3 ms, then read back the data sent by the device. */  in am2315_read_data()
129 	ret = i2c_master_recv(data->client, rx_buf, sizeof(rx_buf));  in am2315_read_data()
131 		dev_err(&data->client->dev, "failed to read sensor data\n");  in am2315_read_data()
134 	mutex_unlock(&data->lock);  in am2315_read_data()
139 	crc = am2315_crc(rx_buf, sizeof(rx_buf) - 2);  in am2315_read_data()
141 		dev_err(&data->client->dev, "failed to verify sensor data\n");  in am2315_read_data()
142 		return -EIO;  in am2315_read_data()
145 	sensor_data->hum_data = (rx_buf[AM2315_HUM_OFFSET] << 8) |  in am2315_read_data()
147 	sensor_data->temp_data = (rx_buf[AM2315_TEMP_OFFSET] << 8) |  in am2315_read_data()
153 	mutex_unlock(&data->lock);  in am2315_read_data()
163 	struct iio_dev *indio_dev = pf->indio_dev;  in am2315_trigger_handler()
171 	mutex_lock(&data->lock);  in am2315_trigger_handler()
172 	if (*(indio_dev->active_scan_mask) == AM2315_ALL_CHANNEL_MASK) {  in am2315_trigger_handler()
173 		data->scan.chans[0] = sensor_data.hum_data;  in am2315_trigger_handler()
174 		data->scan.chans[1] = sensor_data.temp_data;  in am2315_trigger_handler()
177 		for_each_set_bit(bit, indio_dev->active_scan_mask,  in am2315_trigger_handler()
178 				 indio_dev->masklength) {  in am2315_trigger_handler()
179 			data->scan.chans[i] = (bit ? sensor_data.temp_data :  in am2315_trigger_handler()
184 	mutex_unlock(&data->lock);  in am2315_trigger_handler()
186 	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,  in am2315_trigger_handler()
187 					   pf->timestamp);  in am2315_trigger_handler()
189 	iio_trigger_notify_done(indio_dev->trig);  in am2315_trigger_handler()
206 		*val = (chan->type == IIO_HUMIDITYRELATIVE) ?  in am2315_read_raw()
214 	return -EINVAL;  in am2315_read_raw()
227 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in am2315_probe()
229 		dev_err(&client->dev, "iio allocation failed!\n");  in am2315_probe()
230 		return -ENOMEM;  in am2315_probe()
234 	data->client = client;  in am2315_probe()
236 	mutex_init(&data->lock);  in am2315_probe()
238 	indio_dev->info = &am2315_info;  in am2315_probe()
239 	indio_dev->name = AM2315_DRIVER_NAME;  in am2315_probe()
240 	indio_dev->modes = INDIO_DIRECT_MODE;  in am2315_probe()
241 	indio_dev->channels = am2315_channels;  in am2315_probe()
242 	indio_dev->num_channels = ARRAY_SIZE(am2315_channels);  in am2315_probe()
244 	ret = devm_iio_triggered_buffer_setup(&client->dev,  in am2315_probe()
248 		dev_err(&client->dev, "iio triggered buffer setup failed\n");  in am2315_probe()
252 	return devm_iio_device_register(&client->dev, indio_dev);  in am2315_probe()