iio/adc/ti-adc0832.c

120 static int adc0831_adc_conversion(struct adc0832 *adc)
122 	struct spi_device *spi = adc->spi;
125 	ret = spi_read(spi, &adc->rx_buf, 2);
132 	return (adc->rx_buf[0] << 2 & 0xff) | (adc->rx_buf[1] >> 6);
135 static int adc0832_adc_conversion(struct adc0832 *adc, int channel,
138 	struct spi_device *spi = adc->spi;
140 		.tx_buf = adc->tx_buf,
141 		.rx_buf = adc->rx_buf,
146 	if (!adc->mux_bits)
147 		return adc0831_adc_conversion(adc);
150 	adc->tx_buf[0] = 1 << (adc->mux_bits + 1);
152 	adc->tx_buf[0] |= differential ? 0 : (1 << adc->mux_bits);
154 	adc->tx_buf[0] |= (channel % 2) << (adc->mux_bits - 1);
156 	if (adc->mux_bits > 1)
157 		adc->tx_buf[0] |= channel / 2;
160 	adc->tx_buf[0] <<= 1;
166 	return adc->rx_buf[1];
173 	struct adc0832 *adc = iio_priv(iio);
177 		mutex_lock(&adc->lock);
178 		*value = adc0832_adc_conversion(adc, channel->channel,
180 		mutex_unlock(&adc->lock);
186 		*value = regulator_get_voltage(adc->reg);
208 	struct adc0832 *adc = iio_priv(indio_dev);
212 	mutex_lock(&adc->lock);
217 		int ret = adc0832_adc_conversion(adc, scan_chan->channel,
220 			dev_warn(&adc->spi->dev,
225 		adc->data[i] = ret;
228 	iio_push_to_buffers_with_ts(indio_dev, adc->data, sizeof(adc->data),
231 	mutex_unlock(&adc->lock);
246 	struct adc0832 *adc;
249 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
253 	adc = iio_priv(indio_dev);
254 	adc->spi = spi;
255 	mutex_init(&adc->lock);
263 		adc->mux_bits = 0;
268 		adc->mux_bits = 1;
273 		adc->mux_bits = 2;
278 		adc->mux_bits = 3;
286 	adc->reg = devm_regulator_get(&spi->dev, "vref");
287 	if (IS_ERR(adc->reg))
288 		return PTR_ERR(adc->reg);
290 	ret = regulator_enable(adc->reg);
295 				       adc->reg);