The patch titled drivers/hwmon/adcxx.c: fix for single-channel ADCs has been added to the -mm tree. Its filename is adcxx-fix-for-single-channel-adcs.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: drivers/hwmon/adcxx.c: fix for single-channel ADCs From: José Miguel Gonçalves <jose.goncalves@xxxxxxx> While testing an ADC121S021 in an embedded board with a S3C2142 SoC (ARM core), I have found that the 'adcxx' driver does not handle correctly single channel ADCs from this chip family. For single channel chips you must only issue one read transfer for correct measurement. Signed-off-by: Jose Miguel Goncalves <jose.goncalves@xxxxxxx> Cc: Marc Pignat <marc.pignat@xxxxxxx> Cc: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/hwmon/adcxx.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff -puN drivers/hwmon/adcxx.c~adcxx-fix-for-single-channel-adcs drivers/hwmon/adcxx.c --- a/drivers/hwmon/adcxx.c~adcxx-fix-for-single-channel-adcs +++ a/drivers/hwmon/adcxx.c @@ -62,18 +62,23 @@ static ssize_t adcxx_read(struct device 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; } _ Patches currently in -mm which might be from jose.goncalves@xxxxxxx are adcxx-fix-for-single-channel-adcs.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html