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)  in adc084s021_adc_conversion()  argument
75 	int n_words = (adc->spi_trans.len >> 1) - 1; /* Discard first word */  in adc084s021_adc_conversion()
79 	ret = spi_sync(adc->spi, &adc->message);  in adc084s021_adc_conversion()
84 		*(data + i) = adc->rx_buf[i + 1];  in adc084s021_adc_conversion()
93 	struct adc084s021 *adc = iio_priv(indio_dev);  in adc084s021_read_raw()  local
102 		ret = regulator_enable(adc->reg);  in adc084s021_read_raw()
108 		adc->tx_buf[0] = channel->channel << 3;  in adc084s021_read_raw()
109 		ret = adc084s021_adc_conversion(adc, &be_val);  in adc084s021_read_raw()
111 		regulator_disable(adc->reg);  in adc084s021_read_raw()
120 		ret = regulator_enable(adc->reg);  in adc084s021_read_raw()
124 		ret = regulator_get_voltage(adc->reg);  in adc084s021_read_raw()
125 		regulator_disable(adc->reg);  in adc084s021_read_raw()
138  * adc084s021_buffer_trigger_handler() - Read ADC channels and push to buffer.
147 	struct adc084s021 *adc = iio_priv(indio_dev);  in adc084s021_buffer_trigger_handler()  local
149 	mutex_lock(&adc->lock);  in adc084s021_buffer_trigger_handler()
151 	if (adc084s021_adc_conversion(adc, adc->scan.channels) < 0)  in adc084s021_buffer_trigger_handler()
152 		dev_err(&adc->spi->dev, "Failed to read data\n");  in adc084s021_buffer_trigger_handler()
154 	iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,  in adc084s021_buffer_trigger_handler()
156 	mutex_unlock(&adc->lock);  in adc084s021_buffer_trigger_handler()
164 	struct adc084s021 *adc = iio_priv(indio_dev);  in adc084s021_buffer_preenable()  local
171 		adc->tx_buf[i++] = channel->channel << 3;  in adc084s021_buffer_preenable()
173 	adc->spi_trans.len = 2 + (i * sizeof(__be16)); /* Trash + channels */  in adc084s021_buffer_preenable()
175 	return regulator_enable(adc->reg);  in adc084s021_buffer_preenable()
180 	struct adc084s021 *adc = iio_priv(indio_dev);  in adc084s021_buffer_postdisable()  local
182 	adc->spi_trans.len = 4; /* Trash + single channel */  in adc084s021_buffer_postdisable()
184 	return regulator_disable(adc->reg);  in adc084s021_buffer_postdisable()
199 	struct adc084s021 *adc;  in adc084s021_probe()  local
202 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in adc084s021_probe()
208 	adc = iio_priv(indio_dev);  in adc084s021_probe()
209 	adc->spi = spi;  in adc084s021_probe()
219 	adc->spi_trans.tx_buf = adc->tx_buf;  in adc084s021_probe()
220 	adc->spi_trans.rx_buf = adc->rx_buf;  in adc084s021_probe()
221 	adc->spi_trans.len = 4; /* Trash + single channel */  in adc084s021_probe()
222 	spi_message_init_with_transfers(&adc->message, &adc->spi_trans, 1);  in adc084s021_probe()
224 	adc->reg = devm_regulator_get(&spi->dev, "vref");  in adc084s021_probe()
225 	if (IS_ERR(adc->reg))  in adc084s021_probe()
226 		return PTR_ERR(adc->reg);  in adc084s021_probe()
228 	mutex_init(&adc->lock);  in adc084s021_probe()