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ALSA: usb-audio: scarlett2: Fix Level Meter control

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The Level Meter control had a fixed number of channels and therefore
only worked with the 18i20 Gen 2. Fix the control to contain the
correct number of channels.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/5e9a2d5c136270db2d048db53a3b4b6e6d4a63de.1624294591.git.g@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Geoffrey D. Bennett 2021-06-22 03:39:46 +09:30 committed by Takashi Iwai
parent e2cc91ac8f
commit b126bbac98
1 changed files with 13 additions and 12 deletions
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25
sound/usb/mixer_scarlett_gen2.c
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@ -161,10 +161,8 @@ static const u16 scarlett2_mixer_values[SCARLETT2_MIXER_VALUE_COUNT] = {
*/
#define SCARLETT2_MUX_MAX 64
/* Number of meters:
* 18 inputs, 20 outputs, 18 matrix inputs
*/
#define SCARLETT2_NUM_METERS 56
/* Maximum number of meters (sum of output port counts) */
#define SCARLETT2_MAX_METERS 56
/* Hardware port types:
* - None (no input to mux)
@ -1097,26 +1095,26 @@ static int scarlett2_usb_set_mux(struct usb_mixer_interface *mixer)
/* Send USB message to get meter levels */
static int scarlett2_usb_get_meter_levels(struct usb_mixer_interface *mixer,
u16 *levels)
u16 num_meters, u16 *levels)
{
struct {
__le16 pad;
__le16 num_meters;
__le32 magic;
} __packed req;
u32 resp[SCARLETT2_NUM_METERS];
u32 resp[SCARLETT2_MAX_METERS];
int i, err;
req.pad = 0;
req.num_meters = cpu_to_le16(SCARLETT2_NUM_METERS);
req.num_meters = cpu_to_le16(num_meters);
req.magic = cpu_to_le32(SCARLETT2_USB_METER_LEVELS_GET_MAGIC);
err = scarlett2_usb(mixer, SCARLETT2_USB_GET_METER,
&req, sizeof(req), resp, sizeof(resp));
&req, sizeof(req), resp, num_meters * sizeof(u32));
if (err < 0)
return err;
/* copy, convert to u16 */
for (i = 0; i < SCARLETT2_NUM_METERS; i++)
for (i = 0; i < num_meters; i++)
levels[i] = resp[i];
return 0;
@ -2053,10 +2051,11 @@ static int scarlett2_meter_ctl_get(struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
u16 meter_levels[SCARLETT2_NUM_METERS];
u16 meter_levels[SCARLETT2_MAX_METERS];
int i, err;
err = scarlett2_usb_get_meter_levels(elem->head.mixer, meter_levels);
err = scarlett2_usb_get_meter_levels(elem->head.mixer, elem->channels,
meter_levels);
if (err < 0)
return err;
@ -2076,8 +2075,10 @@ static const struct snd_kcontrol_new scarlett2_meter_ctl = {
static int scarlett2_add_meter_ctl(struct usb_mixer_interface *mixer)
{
struct scarlett2_data *private = mixer->private_data;
return scarlett2_add_new_ctl(mixer, &scarlett2_meter_ctl,
0, SCARLETT2_NUM_METERS,
0, private->num_mux_dsts,
"Level Meter", NULL);
}