diff options
| author | Christian Gromm <christian.gromm@microchip.com> | 2018-12-17 15:10:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-17 16:10:20 +0100 |
| commit | d464b7dba1b82dce315af16de88cd6a866306b55 (patch) | |
| tree | a7efe5d1e986b307823691c50b817426daf5a4ca /drivers/staging | |
| parent | e6861b916e7d09b5692fd907e19d6f87e050c9b1 (diff) | |
| download | linux-next-d464b7dba1b82dce315af16de88cd6a866306b55.tar.gz | |
staging: most: Documentation: add information to driver_usage file
This patch updates driver_usage.txt file to reflect the latest changes
that this patch set introduces.
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/most/Documentation/driver_usage.txt | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/staging/most/Documentation/driver_usage.txt b/drivers/staging/most/Documentation/driver_usage.txt index bb9b4e870199..da7a8f405b9b 100644 --- a/drivers/staging/most/Documentation/driver_usage.txt +++ b/drivers/staging/most/Documentation/driver_usage.txt @@ -142,8 +142,9 @@ Cdev component example: Sound component example: -The sound component needs an additional parameter to determine the audio -resolution that is going to be used. The following formats are available: +The sound component needs additional parameters to determine the audio +resolution that is going to be used and to trigger the registration of a +sound card with ALSA. The following audio formats are available: - "1x8" (Mono) - "2x16" (16-bit stereo) @@ -151,9 +152,18 @@ resolution that is going to be used. The following formats are available: - "2x32" (32-bit stereo) - "6x16" (16-bit surround 5.1) - $ echo "mdev0:ep_81:sound:most51_playback.6x16" >$(DRV_DIR)/add_link +To make the sound module create a sound card and register it with ALSA the +string "create" needs to be attached to the module parameter section of the +configuration string. To create a sound card with with two playback devices +(linked to channel ep01 and ep02) and one capture device (linked to channel +ep83) the following is written to the add_link file: + $ echo "mdev0:ep01:sound:most51_playback.6x16" >$(DRV_DIR)/add_link + $ echo "mdev0:ep02:sound:most_playback.2x16" >$(DRV_DIR)/add_link + $ echo "mdev0:ep83:sound:most_capture.2x16.create" >$(DRV_DIR)/add_link +The link names (most51_playback, most_playback and most_capture) will +become the names of the PCM devices of the sound card. Section 2.3 USB Padding |