Lines Matching full:adc
5 * Driver for Texas Instruments' ADC084S021 ADC chip.
68 * adc084s021_adc_conversion() - Read an ADC channel and return its value.
70 * @adc: The ADC SPI data.
73 static int adc084s021_adc_conversion(struct adc084s021 *adc, __be16 *data)
75 int n_words = (adc->spi_trans.len >> 1) - 1; /* Discard first word */
79 ret = spi_sync(adc->spi, &adc->message);
84 *(data + i) = adc->rx_buf[i + 1];
93 struct adc084s021 *adc = iio_priv(indio_dev);
103 ret = regulator_enable(adc->reg);
109 adc->tx_buf[0] = channel->channel << 3;
110 ret = adc084s021_adc_conversion(adc, &be_val);
112 regulator_disable(adc->reg);
121 ret = regulator_enable(adc->reg);
125 ret = regulator_get_voltage(adc->reg);
126 regulator_disable(adc->reg);
139 * adc084s021_buffer_trigger_handler() - Read ADC channels and push to buffer.
148 struct adc084s021 *adc = iio_priv(indio_dev);
150 mutex_lock(&adc->lock);
152 if (adc084s021_adc_conversion(adc, adc->scan.channels) < 0)
153 dev_err(&adc->spi->dev, "Failed to read data\n");
155 iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,
157 mutex_unlock(&adc->lock);
165 struct adc084s021 *adc = iio_priv(indio_dev);
172 adc->tx_buf[i++] = channel->channel << 3;
174 adc->spi_trans.len = 2 + (i * sizeof(__be16)); /* Trash + channels */
176 return regulator_enable(adc->reg);
181 struct adc084s021 *adc = iio_priv(indio_dev);
183 adc->spi_trans.len = 4; /* Trash + single channel */
185 return regulator_disable(adc->reg);
200 struct adc084s021 *adc;
203 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
209 adc = iio_priv(indio_dev);
210 adc->spi = spi;
220 adc->spi_trans.tx_buf = adc->tx_buf;
221 adc->spi_trans.rx_buf = adc->rx_buf;
222 adc->spi_trans.len = 4; /* Trash + single channel */
223 spi_message_init_with_transfers(&adc->message, &adc->spi_trans, 1);
225 adc->reg = devm_regulator_get(&spi->dev, "vref");
226 if (IS_ERR(adc->reg))
227 return PTR_ERR(adc->reg);
229 mutex_init(&adc->lock);