iio/light/veml6070.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * veml6070.c - Support for Vishay VEML6070 UV A light sensor
5  * Copyright 2016 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
7  * IIO driver for VEML6070 (7-bit I2C slave addresses 0x38 and 0x39)
29 #define VEML6070_COMMAND_SD	BIT(0) /* shutdown mode when set */
45 	mutex_lock(&data->lock);  in veml6070_read()
47 	/* disable shutdown */  in veml6070_read()
48 	ret = i2c_smbus_write_byte(data->client1,  in veml6070_read()
49 	    data->config & ~VEML6070_COMMAND_SD);  in veml6070_read()
55 	ret = i2c_smbus_read_byte(data->client2); /* read MSB, address 0x39 */  in veml6070_read()
60 	ret = i2c_smbus_read_byte(data->client1); /* read LSB, address 0x38 */  in veml6070_read()
65 	/* shutdown again */  in veml6070_read()
66 	ret = i2c_smbus_write_byte(data->client1, data->config);  in veml6070_read()
73 	mutex_unlock(&data->lock);  in veml6070_read()
93 	 * conversion of raw UV intensity values to UV index depends on  in veml6070_to_uv_index()
130 		return -EINVAL;  in veml6070_read_raw()
144 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in veml6070_probe()
146 		return -ENOMEM;  in veml6070_probe()
150 	data->client1 = client;  in veml6070_probe()
151 	mutex_init(&data->lock);  in veml6070_probe()
153 	indio_dev->info = &veml6070_info;  in veml6070_probe()
154 	indio_dev->channels = veml6070_channels;  in veml6070_probe()
155 	indio_dev->num_channels = ARRAY_SIZE(veml6070_channels);  in veml6070_probe()
156 	indio_dev->name = VEML6070_DRV_NAME;  in veml6070_probe()
157 	indio_dev->modes = INDIO_DIRECT_MODE;  in veml6070_probe()
159 	data->client2 = i2c_new_dummy_device(client->adapter, VEML6070_ADDR_DATA_LSB);  in veml6070_probe()
160 	if (IS_ERR(data->client2)) {  in veml6070_probe()
161 		dev_err(&client->dev, "i2c device for second chip address failed\n");  in veml6070_probe()
162 		return PTR_ERR(data->client2);  in veml6070_probe()
165 	data->config = VEML6070_IT_10 | VEML6070_COMMAND_RSRVD |  in veml6070_probe()
167 	ret = i2c_smbus_write_byte(data->client1, data->config);  in veml6070_probe()
178 	i2c_unregister_device(data->client2);  in veml6070_probe()
188 	i2c_unregister_device(data->client2);  in veml6070_remove()
208 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
209 MODULE_DESCRIPTION("Vishay VEML6070 UV A light sensor driver");