1 // SPDX-License-Identifier: GPL-2.0
5  * Driver for Texas Instruments' ADC128S052, ADC122S021 and ADC124S021 ADC chip.
35 static int adc128_adc_conversion(struct adc128 *adc, u8 channel)  in adc128_adc_conversion()  argument
39 	mutex_lock(&adc->lock);  in adc128_adc_conversion()
41 	adc->buffer[0] = channel << 3;  in adc128_adc_conversion()
42 	adc->buffer[1] = 0;  in adc128_adc_conversion()
44 	ret = spi_write(adc->spi, &adc->buffer, 2);  in adc128_adc_conversion()
46 		mutex_unlock(&adc->lock);  in adc128_adc_conversion()
50 	ret = spi_read(adc->spi, &adc->buffer, 2);  in adc128_adc_conversion()
52 	mutex_unlock(&adc->lock);  in adc128_adc_conversion()
57 	return ((adc->buffer[0] << 8 | adc->buffer[1]) & 0xFFF);  in adc128_adc_conversion()
64 	struct adc128 *adc = iio_priv(indio_dev);  in adc128_read_raw()  local
70 		ret = adc128_adc_conversion(adc, channel->channel);  in adc128_read_raw()
79 		ret = regulator_get_voltage(adc->reg);  in adc128_read_raw()
88 		return -EINVAL;  in adc128_read_raw()
144 	struct adc128 *adc;  in adc128_probe()  local
147 	if (dev_fwnode(&spi->dev))  in adc128_probe()
148 		config = (unsigned long) device_get_match_data(&spi->dev);  in adc128_probe()
150 		config = spi_get_device_id(spi)->driver_data;  in adc128_probe()
152 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in adc128_probe()
154 		return -ENOMEM;  in adc128_probe()
156 	adc = iio_priv(indio_dev);  in adc128_probe()
157 	adc->spi = spi;  in adc128_probe()
159 	indio_dev->name = spi_get_device_id(spi)->name;  in adc128_probe()
160 	indio_dev->modes = INDIO_DIRECT_MODE;  in adc128_probe()
161 	indio_dev->info = &adc128_info;  in adc128_probe()
163 	indio_dev->channels = adc128_config[config].channels;  in adc128_probe()
164 	indio_dev->num_channels = adc128_config[config].num_channels;  in adc128_probe()
166 	adc->reg = devm_regulator_get(&spi->dev, "vref");  in adc128_probe()
167 	if (IS_ERR(adc->reg))  in adc128_probe()
168 		return PTR_ERR(adc->reg);  in adc128_probe()
170 	ret = regulator_enable(adc->reg);  in adc128_probe()
173 	ret = devm_add_action_or_reset(&spi->dev, adc128_disable_regulator,  in adc128_probe()
174 				       adc->reg);  in adc128_probe()
178 	mutex_init(&adc->lock);  in adc128_probe()
180 	return devm_iio_device_register(&spi->dev, indio_dev);  in adc128_probe()