diff options
| author |   Gregor Boirie <gregor.boirie@parrot.com> | 2016-06-27 12:38:52 +0200 |
|---|---|---|
| committer |   Jonathan Cameron <jic23@kernel.org> | 2016-07-04 18:07:45 +0100 |
| commit | e7385de5291e347f5bc85985acdce3a3f5096667 (patch) | |
| tree | 98dc064de5097f1ca9c91b39b0dcbcb63d4e645e /drivers/iio/common | |
| parent | staging:iio:lis3l02dq drop separate driver (diff) | |
| download | linux-dev-e7385de5291e347f5bc85985acdce3a3f5096667.tar.xz linux-dev-e7385de5291e347f5bc85985acdce3a3f5096667.zip | |
iio:st_sensors: align on storagebits boundaries
Ensure triggered buffering memory accesses are properly aligned on per
channel storagebits boundaries.
Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/common')
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_buffer.c | 37 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_core.c | 2 |
2 files changed, 19 insertions, 20 deletions
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c index 2371fc875d2d..d06e728cea37 100644 --- a/drivers/iio/common/st_sensors/st_sensors_buffer.c +++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c @@ -24,30 +24,29 @@ static int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf) { - int i, len; - int total = 0; + int i; struct st_sensor_data *sdata = iio_priv(indio_dev); unsigned int num_data_channels = sdata->num_data_channels; - for (i = 0; i < num_data_channels; i++) { - unsigned int bytes_to_read; - - if (test_bit(i, indio_dev->active_scan_mask)) { - bytes_to_read = indio_dev->channels[i].scan_type.storagebits >> 3; - len = sdata->tf->read_multiple_byte(&sdata->tb, - sdata->dev, indio_dev->channels[i].address, - bytes_to_read, - buf + total, sdata->multiread_bit); - - if (len < bytes_to_read) - return -EIO; - - /* Advance the buffer pointer */ - total += len; - } + for_each_set_bit(i, indio_dev->active_scan_mask, num_data_channels) { + const struct iio_chan_spec *channel = &indio_dev->channels[i]; + unsigned int bytes_to_read = channel->scan_type.realbits >> 3; + unsigned int storage_bytes = + channel->scan_type.storagebits >> 3; + + buf = PTR_ALIGN(buf, storage_bytes); + if (sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + channel->address, + bytes_to_read, buf, + sdata->multiread_bit) < + bytes_to_read) + return -EIO; + + /* Advance the buffer pointer */ + buf += storage_bytes; } - return total; + return 0; } irqreturn_t st_sensors_trigger_handler(int irq, void *p) diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c index 26ce32552448..2d5282e05482 100644 --- a/drivers/iio/common/st_sensors/st_sensors_core.c +++ b/drivers/iio/common/st_sensors/st_sensors_core.c @@ -490,7 +490,7 @@ static int st_sensors_read_axis_data(struct iio_dev *indio_dev, int err; u8 *outdata; struct st_sensor_data *sdata = iio_priv(indio_dev); - unsigned int byte_for_channel = ch->scan_type.storagebits >> 3; + unsigned int byte_for_channel = ch->scan_type.realbits >> 3; outdata = kmalloc(byte_for_channel, GFP_KERNEL); if (!outdata) |