ALSA: usb-audio: scarlett2: Remove redundant info->button_count

The per-model button_count value was used to determine whether
dim/mute controls should be added, but these are present iff
line_out_hw_vol is true. Remove button_count and replace with
SCARLETT2_BUTTON_MAX and a check for line_out_hw_vol true.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/20210620164634.GA9193@m.b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c
index 3225ec7..043b092 100644 (file)
--- a/sound/usb/mixer_scarlett_gen2.c
+++ b/sound/usb/mixer_scarlett_gen2.c
@@ -218,7 +218,6 @@ struct scarlett2_ports {
 
 struct scarlett2_device_info {
        u8 line_out_hw_vol; /* line out hw volume is sw controlled */
-       u8 button_count; /* number of buttons */
        u8 level_input_count; /* inputs with level selectable */
        u8 pad_input_count; /* inputs with pad selectable */
        const char * const line_out_descrs[SCARLETT2_ANALOGUE_MAX];
@@ -370,9 +369,6 @@ static const struct scarlett2_device_info s18i20_gen2_info = {
         */
        .line_out_hw_vol = 1,
 
-       /* Mute and dim buttons */
-       .button_count = 2,
-
        .line_out_descrs = {
                "Monitor L",
                "Monitor R",
@@ -1108,7 +1104,8 @@ static int scarlett2_add_new_ctl(struct usb_mixer_interface *mixer,
 static int scarlett2_update_volumes(struct usb_mixer_interface *mixer)
 {
        struct scarlett2_mixer_data *private = mixer->private_data;
-       const struct scarlett2_ports *ports = private->info->ports;
+       const struct scarlett2_device_info *info = private->info;
+       const struct scarlett2_ports *ports = info->ports;
        struct scarlett2_usb_volume_status volume_status;
        int num_line_out =
                ports[SCARLETT2_PORT_TYPE_ANALOGUE].num[SCARLETT2_PORT_OUT];
@@ -1129,8 +1126,9 @@ static int scarlett2_update_volumes(struct usb_mixer_interface *mixer)
                        private->vol[i] = private->master_vol;
        }
 
-       for (i = 0; i < private->info->button_count; i++)
-               private->buttons[i] = !!volume_status.buttons[i];
+       if (info->line_out_hw_vol)
+               for (i = 0; i < SCARLETT2_BUTTON_MAX; i++)
+                       private->buttons[i] = !!volume_status.buttons[i];
 
        return 0;
 }
@@ -1547,13 +1545,15 @@ static int scarlett2_add_line_out_ctls(struct usb_mixer_interface *mixer)
        }
 
        /* Add HW button controls */
-       for (i = 0; i < private->info->button_count; i++) {
-               err = scarlett2_add_new_ctl(mixer, &scarlett2_button_ctl,
-                                           i, 1, scarlett2_button_names[i],
-                                           &private->button_ctls[i]);
-               if (err < 0)
-                       return err;
-       }
+       if (info->line_out_hw_vol)
+               for (i = 0; i < SCARLETT2_BUTTON_MAX; i++) {
+                       err = scarlett2_add_new_ctl(
+                               mixer, &scarlett2_button_ctl,
+                               i, 1, scarlett2_button_names[i],
+                               &private->button_ctls[i]);
+                       if (err < 0)
+                               return err;
+               }
 
        return 0;
 }
@@ -1961,8 +1961,9 @@ static int scarlett2_read_configs(struct usb_mixer_interface *mixer)
                private->vol[i] = volume;
        }
 
-       for (i = 0; i < info->button_count; i++)
-               private->buttons[i] = !!volume_status.buttons[i];
+       if (info->line_out_hw_vol)
+               for (i = 0; i < SCARLETT2_BUTTON_MAX; i++)
+                       private->buttons[i] = !!volume_status.buttons[i];
 
        for (i = 0; i < num_mixer_out; i++) {
                err = scarlett2_usb_get_mix(mixer, i);
@@ -2001,11 +2002,15 @@ static void scarlett2_mixer_interrupt_button_change(
        struct usb_mixer_interface *mixer)
 {
        struct scarlett2_mixer_data *private = mixer->private_data;
+       const struct scarlett2_device_info *info = private->info;
        int i;
 
        private->vol_updated = 1;
 
-       for (i = 0; i < private->info->button_count; i++)
+       if (!info->line_out_hw_vol)
+               return;
+
+       for (i = 0; i < SCARLETT2_BUTTON_MAX; i++)
                snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &private->button_ctls[i]->id);
 }
@@ -2109,7 +2114,7 @@ static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer,
                return err;
 
        /* Set up the interrupt polling if there are hardware buttons */
-       if (info->button_count) {
+       if (info->line_out_hw_vol) {
                err = scarlett2_mixer_status_create(mixer);
                if (err < 0)
                        return err;