ALSA: usb: mixer: volume quirk for CM102-A+/102S+

[mirror_ubuntu-bionic-kernel.git] / sound / usb / mixer.c

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 2b4ceda36291c01c6cca69d3a1cacd6c23014f40..5d6cd4eb8101498db7ef2a1a0521bdc7dc3ba427 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -347,17 +347,20 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
                            int validx, int *value_ret)
 {
        struct snd_usb_audio *chip = cval->head.mixer->chip;
-       unsigned char buf[4 + 3 * sizeof(__u32)]; /* enough space for one range */
+       /* enough space for one range */
+       unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
        unsigned char *val;
-       int idx = 0, ret, size;
+       int idx = 0, ret, val_size, size;
        __u8 bRequest;
 
+       val_size = uac2_ctl_value_size(cval->val_type);
+
        if (request == UAC_GET_CUR) {
                bRequest = UAC2_CS_CUR;
-               size = uac2_ctl_value_size(cval->val_type);
+               size = val_size;
        } else {
                bRequest = UAC2_CS_RANGE;
-               size = sizeof(buf);
+               size = sizeof(__u16) + 3 * val_size;
        }
 
        memset(buf, 0, sizeof(buf));
@@ -390,16 +393,17 @@ error:
                val = buf + sizeof(__u16);
                break;
        case UAC_GET_MAX:
-               val = buf + sizeof(__u16) * 2;
+               val = buf + sizeof(__u16) + val_size;
                break;
        case UAC_GET_RES:
-               val = buf + sizeof(__u16) * 3;
+               val = buf + sizeof(__u16) + val_size * 2;
                break;
        default:
                return -EINVAL;
        }
 
-       *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
+       *value_ret = convert_signed_value(cval,
+                                         snd_usb_combine_bytes(val, val_size));
 
        return 0;
 }
@@ -907,6 +911,14 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval,
                }
                break;
 
+       case USB_ID(0x0d8c, 0x0103):
+               if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
+                       usb_audio_info(chip,
+                                "set volume quirk for CM102-A+/102S+\n");
+                       cval->min = -256;
+               }
+               break;
+
        case USB_ID(0x0471, 0x0101):
        case USB_ID(0x0471, 0x0104):
        case USB_ID(0x0471, 0x0105):