diff options
| author | Geoffrey D. Bennett <g@b4.vu> | 2023-12-25 06:00:15 +1030 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-12-29 15:41:23 +0100 |
| commit | 56275126aca20e0a0bfa51e3307576aee76b7264 (patch) | |
| tree | 2e090d7f84853c1a542da9f60a4d6edd9a9aa7c0 /sound/usb | |
| parent | 90d8fef837a53e6b5c2c3c14c6063ee8d78277a9 (diff) | |
ALSA: scarlett2: Add scarlett2_mixer_value_to_db()
Refactor scarlett2_usb_get_mix(), moving the scarlett2_mixer_values[]
lookup into scarlett2_mixer_value_to_db().
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/7adf869852aba2819fddb850b0ea8df5f7d73931.1703444932.git.g@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/mixer_scarlett2.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/sound/usb/mixer_scarlett2.c b/sound/usb/mixer_scarlett2.c index 95f6f1454fbf..6b026648ac3c 100644 --- a/sound/usb/mixer_scarlett2.c +++ b/sound/usb/mixer_scarlett2.c @@ -1763,6 +1763,19 @@ static int scarlett2_has_mixer(struct scarlett2_data *private) return !!private->info->mux_assignment[0][0].count; } +/* Map from mixer value to (db + 80) * 2 + * (reverse of scarlett2_mixer_values[]) + */ +static int scarlett2_mixer_value_to_db(int value) +{ + int i; + + for (i = 0; i < SCARLETT2_MIXER_VALUE_COUNT; i++) + if (scarlett2_mixer_values[i] >= value) + return i; + return SCARLETT2_MIXER_MAX_VALUE; +} + /* Send a USB message to get the volumes for all inputs of one mix * and put the values into private->mix[] */ @@ -1772,7 +1785,7 @@ static int scarlett2_usb_get_mix(struct usb_mixer_interface *mixer, struct scarlett2_data *private = mixer->private_data; int num_mixer_in = private->num_mix_in; - int err, i, j, k; + int err, i, j; struct { __le16 mix_num; @@ -1790,16 +1803,9 @@ static int scarlett2_usb_get_mix(struct usb_mixer_interface *mixer, if (err < 0) return err; - for (i = 0, j = mix_num * num_mixer_in; i < num_mixer_in; i++, j++) { - u16 mixer_value = le16_to_cpu(data[i]); - - for (k = 0; k < SCARLETT2_MIXER_VALUE_COUNT; k++) - if (scarlett2_mixer_values[k] >= mixer_value) - break; - if (k == SCARLETT2_MIXER_VALUE_COUNT) - k = SCARLETT2_MIXER_MAX_VALUE; - private->mix[j] = k; - } + for (i = 0, j = mix_num * num_mixer_in; i < num_mixer_in; i++, j++) + private->mix[j] = scarlett2_mixer_value_to_db( + le16_to_cpu(data[i])); return 0; } |