diff options
Diffstat (limited to 'drivers/hwmon/adcxx.c')
| -rw-r--r-- | drivers/hwmon/adcxx.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/hwmon/adcxx.c b/drivers/hwmon/adcxx.c index 5e9e095f113..fbdc7655303 100644 --- a/drivers/hwmon/adcxx.c +++ b/drivers/hwmon/adcxx.c @@ -37,6 +37,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> +#include <linux/slab.h> #include <linux/device.h> #include <linux/err.h> #include <linux/sysfs.h> @@ -62,18 +63,23 @@ 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; } |