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| author | Ruslan Bilovol <ruslan.bilovol@gmail.com> | 2021-07-12 14:55:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 10:10:11 +0200 |
| commit | 02de698ca8123782c0c6fb8ed99080e2f032b0d2 (patch) | |
| tree | e71937dca9ff2e0852bd290e239b35cf539f0afc /drivers/usb/gadget/function/u_audio.h | |
| parent | b48f8939b9ff593ebed20433bb53c51199920412 (diff) | |
| download | linux-02de698ca8123782c0c6fb8ed99080e2f032b0d2.tar.gz linux-02de698ca8123782c0c6fb8ed99080e2f032b0d2.zip | |
usb: gadget: u_audio: add bi-directional volume and mute support
USB Audio Class 1/2 have ability to change device's
volume and mute by USB Host through class-specific control
requests. Device also can notify Host about volume/mute
change on its side through optional interrupt endpoint.
This patch adds Volume and Mute ALSA controls which can be
used by user to send and receive notifications to/from
the USB Host about Volume and Mute change.
These params come from f_uac* so volume and mute controls
will be created only if the function support and enable
each explicitly
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20210712125529.76070-3-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/gadget/function/u_audio.h')
| -rw-r--r-- | drivers/usb/gadget/function/u_audio.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/u_audio.h b/drivers/usb/gadget/function/u_audio.h index a218cdf771fe..001a79a46022 100644 --- a/drivers/usb/gadget/function/u_audio.h +++ b/drivers/usb/gadget/function/u_audio.h @@ -19,16 +19,30 @@ */ #define FBACK_SLOW_MAX 250 +/* Feature Unit parameters */ +struct uac_fu_params { + int id; /* Feature Unit ID */ + + bool mute_present; /* mute control enable */ + + bool volume_present; /* volume control enable */ + s16 volume_min; /* min volume in 1/256 dB */ + s16 volume_max; /* max volume in 1/256 dB */ + s16 volume_res; /* volume resolution in 1/256 dB */ +}; + struct uac_params { /* playback */ int p_chmask; /* channel mask */ int p_srate; /* rate in Hz */ int p_ssize; /* sample size */ + struct uac_fu_params p_fu; /* Feature Unit parameters */ /* capture */ int c_chmask; /* channel mask */ int c_srate; /* rate in Hz */ int c_ssize; /* sample size */ + struct uac_fu_params c_fu; /* Feature Unit parameters */ int req_number; /* number of preallocated requests */ int fb_max; /* upper frequency drift feedback limit per-mil */ @@ -49,6 +63,9 @@ struct g_audio { /* Max packet size for all out_ep possible speeds */ unsigned int out_ep_maxpsize; + /* Notify UAC driver about control change */ + int (*notify)(struct g_audio *g_audio, int unit_id, int cs); + /* The ALSA Sound Card it represents on the USB-Client side */ struct snd_uac_chip *uac; @@ -94,4 +111,9 @@ void u_audio_stop_capture(struct g_audio *g_audio); int u_audio_start_playback(struct g_audio *g_audio); void u_audio_stop_playback(struct g_audio *g_audio); +int u_audio_get_volume(struct g_audio *g_audio, int playback, s16 *val); +int u_audio_set_volume(struct g_audio *g_audio, int playback, s16 val); +int u_audio_get_mute(struct g_audio *g_audio, int playback, int *val); +int u_audio_set_mute(struct g_audio *g_audio, int playback, int val); + #endif /* __U_AUDIO_H */ |