diff options
| author | Rahul Mittal <rmittal@nvidia.com> | 2013-06-03 20:59:03 +0530 |
|---|---|---|
| committer | Harshada Kale <hkale@nvidia.com> | 2013-06-06 07:09:30 -0700 |
| commit | 3ee6a261731ca9d07e54c47923d338ca193dfed4 (patch) | |
| tree | 9520983246712066282330c90ca0b71661881939 /sound/usb | |
| parent | 90aa63b2f08ae84870970c2aaeed8fb0f71efb62 (diff) | |
ALSA: usbaudio: Expose usb device supported sample rates
Add alsa control for exposing sample rate range
supported by the usb audio device
Bug 1274264
Bug 1240790
Change-Id: I6b0c43416ad61009cd287f948210aca29b62c3fc
Signed-off-by: Rahul Mittal <rmittal@nvidia.com>
Reviewed-on: http://git-master/r/235030
Reviewed-by: Scott Peterson <speterson@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Sumit Bhattacharya <sumitb@nvidia.com>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/stream.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c index 5ff8010b2d6f..d044d518b5c1 100644 --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -23,6 +23,7 @@ #include <sound/core.h> #include <sound/pcm.h> +#include <sound/control.h> #include "usbaudio.h" #include "card.h" @@ -225,6 +226,35 @@ static struct uac2_output_terminal_descriptor * return NULL; } +static int usb_device_sample_rate_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 2; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 192000; + return 0; +} + +static int usb_device_sample_rate_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct audioformat *fp = snd_kcontrol_chip(kcontrol); + + ucontrol->value.integer.value[0] = fp->rate_min; + ucontrol->value.integer.value[1] = fp->rate_max; + + return 0; +} + +struct snd_kcontrol_new usb_device_sample_rate_control = { + .access = SNDRV_CTL_ELEM_ACCESS_READ, + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "USB Device Sample Rate", + .info = usb_device_sample_rate_info, + .get = usb_device_sample_rate_get, +}; + int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no) { struct usb_device *dev; @@ -447,6 +477,11 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no) snd_usb_init_pitch(chip, iface_no, alts, fp); snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max); } + + /* Add usb device sample rate control */ + snd_ctl_add(chip->card, + snd_ctl_new1(&usb_device_sample_rate_control, fp)); + return 0; } |