6.6-stable review patch. If anyone has any objections, please let me know.
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From: Javier Carrasco javier.carrasco.cruz@gmail.com
commit ab09c6cfe01b317f515bcd944668697241a54b9d upstream.
The channel index is off by one unit if AS73211_SCAN_MASK_ALL is not set (optimized path for color channel readings), and it must be shifted instead of leaving an empty channel for the temperature when it is off.
Once the channel index is fixed, the uninitialized channel must be set to zero to avoid pushing uninitialized data.
Add available_scan_masks for all channels and only-color channels to let the IIO core demux and repack the enabled channels.
Cc: stable@vger.kernel.org Fixes: 403e5586b52e ("iio: light: as73211: New driver") Tested-by: Christian Eggers ceggers@arri.de Signed-off-by: Javier Carrasco javier.carrasco.cruz@gmail.com Link: https://patch.msgid.link/20241214-iio_memset_scan_holes-v4-1-260b395b8ed5@gm... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/light/as73211.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-)
--- a/drivers/iio/light/as73211.c +++ b/drivers/iio/light/as73211.c @@ -154,6 +154,12 @@ struct as73211_data { BIT(AS73211_SCAN_INDEX_TEMP) | \ AS73211_SCAN_MASK_COLOR)
+static const unsigned long as73211_scan_masks[] = { + AS73211_SCAN_MASK_COLOR, + AS73211_SCAN_MASK_ALL, + 0 +}; + static const struct iio_chan_spec as73211_channels[] = { { .type = IIO_TEMP, @@ -602,9 +608,12 @@ static irqreturn_t as73211_trigger_handl
/* AS73211 starts reading at address 2 */ ret = i2c_master_recv(data->client, - (char *)&scan.chan[1], 3 * sizeof(scan.chan[1])); + (char *)&scan.chan[0], 3 * sizeof(scan.chan[0])); if (ret < 0) goto done; + + /* Avoid pushing uninitialized data */ + scan.chan[3] = 0; }
if (data_result) { @@ -612,9 +621,15 @@ static irqreturn_t as73211_trigger_handl * Saturate all channels (in case of overflows). Temperature channel * is not affected by overflows. */ - scan.chan[1] = cpu_to_le16(U16_MAX); - scan.chan[2] = cpu_to_le16(U16_MAX); - scan.chan[3] = cpu_to_le16(U16_MAX); + if (*indio_dev->active_scan_mask == AS73211_SCAN_MASK_ALL) { + scan.chan[1] = cpu_to_le16(U16_MAX); + scan.chan[2] = cpu_to_le16(U16_MAX); + scan.chan[3] = cpu_to_le16(U16_MAX); + } else { + scan.chan[0] = cpu_to_le16(U16_MAX); + scan.chan[1] = cpu_to_le16(U16_MAX); + scan.chan[2] = cpu_to_le16(U16_MAX); + } }
iio_push_to_buffers_with_timestamp(indio_dev, &scan, iio_get_time_ns(indio_dev)); @@ -684,6 +699,7 @@ static int as73211_probe(struct i2c_clie indio_dev->channels = as73211_channels; indio_dev->num_channels = ARRAY_SIZE(as73211_channels); indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->available_scan_masks = as73211_scan_masks;
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_OSR); if (ret < 0)