ALSA: usb-audio: add quirk QUIRK_FLAG_MIXER_CAPTURE_MIN_MUTE

The same hardware problem to QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE also
occurs on the capture streams on some USB devices. Add a new flag for
processing the quirk.

Link: https://lore.kernel.org/all/C22C1A172EBB9BD9+eccc2e4a-d21e-4a7d-848c-bbf3982feb94@uniontech.com/
Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250903-sound-v1-2-d4ca777b8512@uniontech.com

diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index 062b86522e4d9cc7ec19e978e0efc934dae9ab1b..bf45df1558bbc361ca165abaf9c5d83bfe3188e2 100644 (file)
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -2329,6 +2329,7 @@ quirk_flags
         * bit 24: Set minimum volume control value as mute for devices
           where the lowest playback value represents muted state instead
           of minimum audible volume
+        * bit 25: Be similar to bit 24 but for capture streams
 
 This module supports multiple devices, autoprobe and hotplugging.
 

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 2a1abc24dbfc0c6b69d64529eda01bc25f1a6dd1..828af3095b86ee0aa8f2d248d8e714b5d3ae20eb 100644 (file)
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -4550,6 +4550,13 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
                        cval->min_mute = 1;
                }
 
+       /* lowest capture value is muted on some devices */
+       if (mixer->chip->quirk_flags & QUIRK_FLAG_MIXER_CAPTURE_MIN_MUTE)
+               if (strstr(kctl->id.name, "Capture")) {
+                       usb_audio_info(mixer->chip,
+                                      "applying capture min mute quirk\n");
+                       cval->min_mute = 1;
+               }
        /* ALSA-ify some Plantronics headset control names */
        if (USB_ID_VENDOR(mixer->chip->usb_id) == 0x047f &&
            (cval->control == UAC_FU_MUTE || cval->control == UAC_FU_VOLUME))

diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 707b3037b1b3a3d2997157154cf78d71455bfe4b..30b5102e3caed01eeb86d0075c41338104c58950 100644 (file)
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -222,6 +222,8 @@ extern bool snd_usb_skip_validation;
  * QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE
  *  Set minimum volume control value as mute for devices where the lowest
  *  playback value represents muted state instead of minimum audible volume
+ * QUIRK_FLAG_MIXER_CAPTURE_MIN_MUTE
+ *  Similar to QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE, but for capture streams
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE     (1U << 0)
@@ -249,5 +251,6 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_MIC_RES_16          (1U << 22)
 #define QUIRK_FLAG_MIC_RES_384         (1U << 23)
 #define QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE     (1U << 24)
+#define QUIRK_FLAG_MIXER_CAPTURE_MIN_MUTE      (1U << 25)
 
 #endif /* __USBAUDIO_H */