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path: root/drivers/hwmon/adcxx.c
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Diffstat (limited to 'drivers/hwmon/adcxx.c')
-rw-r--r--drivers/hwmon/adcxx.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/hwmon/adcxx.c b/drivers/hwmon/adcxx.c
index 5e9e095f1136..74d9c5195e44 100644
--- a/drivers/hwmon/adcxx.c
+++ b/drivers/hwmon/adcxx.c
@@ -62,18 +62,23 @@ static ssize_t adcxx_read(struct device *dev,
struct spi_device *spi = to_spi_device(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adcxx *adc = dev_get_drvdata(&spi->dev);
- u8 tx_buf[2] = { attr->index << 3 }; /* other bits are don't care */
+ u8 tx_buf[2];
u8 rx_buf[2];
int status;
- int value;
+ u32 value;
if (mutex_lock_interruptible(&adc->lock))
return -ERESTARTSYS;
- status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
- rx_buf, sizeof(rx_buf));
+ if (adc->channels == 1) {
+ status = spi_read(spi, rx_buf, sizeof(rx_buf));
+ } else {
+ tx_buf[0] = attr->index << 3; /* other bits are don't care */
+ status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
+ rx_buf, sizeof(rx_buf));
+ }
if (status < 0) {
- dev_warn(dev, "spi_write_then_read failed with status %d\n",
+ dev_warn(dev, "SPI synch. transfer failed with status %d\n",
status);
goto out;
}