98 static int mcp320x_adc_conversion(struct mcp320x *adc, u8 channel,  in mcp320x_adc_conversion()  argument
103 	adc->rx_buf[0] = 0;  in mcp320x_adc_conversion()
104 	adc->rx_buf[1] = 0;  in mcp320x_adc_conversion()
105 	adc->tx_buf = mcp320x_channel_to_tx_data(device_index,  in mcp320x_adc_conversion()
109 		ret = spi_sync(adc->spi, &adc->msg);  in mcp320x_adc_conversion()
113 		ret = spi_read(adc->spi, &adc->rx_buf, sizeof(adc->rx_buf));  in mcp320x_adc_conversion()
120 		return (adc->rx_buf[0] << 5 | adc->rx_buf[1] >> 3);  in mcp320x_adc_conversion()
124 		return (adc->rx_buf[0] << 2 | adc->rx_buf[1] >> 6);  in mcp320x_adc_conversion()
126 		return (adc->rx_buf[0] << 7 | adc->rx_buf[1] >> 1);  in mcp320x_adc_conversion()
130 		return (adc->rx_buf[0] << 4 | adc->rx_buf[1] >> 4);  in mcp320x_adc_conversion()
132 		return sign_extend32((adc->rx_buf[0] & 0x1f) << 8 | adc->rx_buf[1], 12);  in mcp320x_adc_conversion()
142 	struct mcp320x *adc = iio_priv(indio_dev);  in mcp320x_read_raw()  local
146 	mutex_lock(&adc->lock);  in mcp320x_read_raw()
148 	device_index = spi_get_device_id(adc->spi)->driver_data;  in mcp320x_read_raw()
152 		ret = mcp320x_adc_conversion(adc, channel->address,  in mcp320x_read_raw()
163 		ret = regulator_get_voltage(adc->reg);  in mcp320x_read_raw()
169 		*val2 = adc->chip_info->resolution;  in mcp320x_read_raw()
175 	mutex_unlock(&adc->lock);  in mcp320x_read_raw()
292 	struct mcp320x *adc;  in mcp320x_probe()  local
296 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in mcp320x_probe()
300 	adc = iio_priv(indio_dev);  in mcp320x_probe()
301 	adc->spi = spi;  in mcp320x_probe()
312 	adc->chip_info = chip_info;  in mcp320x_probe()
314 	adc->transfer[0].tx_buf = &adc->tx_buf;  in mcp320x_probe()
315 	adc->transfer[0].len = sizeof(adc->tx_buf);  in mcp320x_probe()
316 	adc->transfer[1].rx_buf = adc->rx_buf;  in mcp320x_probe()
317 	adc->transfer[1].len = sizeof(adc->rx_buf);  in mcp320x_probe()
319 	spi_message_init_with_transfers(&adc->msg, adc->transfer,  in mcp320x_probe()
320 					ARRAY_SIZE(adc->transfer));  in mcp320x_probe()
322 	adc->reg = devm_regulator_get(&spi->dev, "vref");  in mcp320x_probe()
323 	if (IS_ERR(adc->reg))  in mcp320x_probe()
324 		return PTR_ERR(adc->reg);  in mcp320x_probe()
326 	ret = regulator_enable(adc->reg);  in mcp320x_probe()
330 	mutex_init(&adc->lock);  in mcp320x_probe()
339 	regulator_disable(adc->reg);  in mcp320x_probe()
347 	struct mcp320x *adc = iio_priv(indio_dev);  in mcp320x_remove()  local
350 	regulator_disable(adc->reg);  in mcp320x_remove()