[ALSA] usb-audio - add selector unit names override for Audigy 2 NX

USB generic driver
Add a mechanism to specify source names of selector units,
and add such names for the SB Audigy 2 NX.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

2 files changed, 69 insertions, 6 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 5f1906915aa6..6ad154aaba1b 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -70,6 +70,7 @@ struct usb_mixer_build {
         DECLARE_BITMAP(unitbitmap, 32*32);
         usb_audio_term_t oterm;
         const struct usbmix_name_map *map;
+        const struct usbmix_selector_map *selector_map;
 };
 
 struct usb_mixer_elem_info {
@@ -187,6 +188,21 @@ static int check_ignored_ctl(mixer_build_t *state, int unitid, int control)
         return 0;
 }
 
+/* get the mapped selector source name */
+static int check_mapped_selector_name(mixer_build_t *state, int unitid,
+                                      int index, char *buf, int buflen)
+{
+        const struct usbmix_selector_map *p;
+
+        if (! state->selector_map)
+                return 0;
+        for (p = state->selector_map; p->id; p++) {
+                if (p->id == unitid && index < p->count)
+                        return strlcpy(buf, p->names[index], buflen);
+        }
+        return 0;
+}
+
 /*
  * find an audio control unit with the given unit id
  */
@@ -1415,7 +1431,9 @@ static int parse_audio_selector_unit(mixer_build_t *state, int unitid, unsigned
                         kfree(cval);
                         return -ENOMEM;
                 }
-                if (check_input_term(state, desc[5 + i], &iterm) >= 0)
+                len = check_mapped_selector_name(state, unitid, i, namelist[i],
+                                                 MAX_ITEM_NAME_LEN);
+                if (! len && check_input_term(state, desc[5 + i], &iterm) >= 0)
                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
                 if (! len)
                         sprintf(namelist[i], "Input %d", i);
@@ -1521,6 +1539,7 @@ int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
         for (map = usbmix_ctl_maps; map->vendor; map++) {
                 if (map->vendor == state.vendor && map->product == state.product) {
                         state.map = map->map;
+                        state.selector_map = map->selector_map;
                         chip->ignore_ctl_error = map->ignore_ctl_error;
                         break;
                 }
diff --git a/sound/usb/usbmixer_maps.c b/sound/usb/usbmixer_maps.c
index 4918a1854223..adb0abb3ee85 100644
--- a/sound/usb/usbmixer_maps.c
+++ b/sound/usb/usbmixer_maps.c
@@ -26,10 +26,17 @@ struct usbmix_name_map {
         int control;
 };
 
+struct usbmix_selector_map {
+        int id;
+        int count;
+        const char **names;
+};
+
 struct usbmix_ctl_map {
         int vendor;
         int product;
         const struct usbmix_name_map *map;
+        const struct usbmix_selector_map *selector_map;
         int ignore_ctl_error;
 };
 
@@ -162,6 +169,25 @@ static struct usbmix_name_map audigy2nx_map[] = {
         { 0 } /* terminator */
 };
 
+static struct usbmix_selector_map audigy2nx_selectors[] = {
+        {
+                .id = 14, /* Capture Source */
+                .count = 3,
+                .names = (const char*[]) {"Line", "Digital In", "What-U-Hear"}
+        },
+        {
+                .id = 29, /* Digital Out Source */
+                .count = 3,
+                .names = (const char*[]) {"Front", "PCM", "Digital In"}
+        },
+        {
+                .id = 31, /* Headphone Source */
+                .count = 2,
+                .names = (const char*[]) {"Front", "Side"}
+        },
+        { 0 } /* terminator */
+};
+
 /* LineX FM Transmitter entry - needed to bypass controls bug */
 static struct usbmix_name_map linex_map[] = {
         /* 1: IT pcm */
@@ -198,11 +224,29 @@ static struct usbmix_name_map justlink_map[] = {
  */
 
 static struct usbmix_ctl_map usbmix_ctl_maps[] = {
-        { 0x41e, 0x3000, extigy_map, 1 },
-        { 0x41e, 0x3010, mp3plus_map, 0 },
-        { 0x41e, 0x3020, audigy2nx_map, 0 },
-        { 0x8bb, 0x2702, linex_map, 1 },
-        { 0xc45, 0x1158, justlink_map, 0 },
+        {
+                .vendor = 0x41e, .product = 0x3000,
+                .map = extigy_map,
+                .ignore_ctl_error = 1,
+        },
+        {
+                .vendor = 0x41e, .product = 0x3010,
+                .map = mp3plus_map,
+        },
+        {
+                .vendor = 0x41e, .product = 0x3020,
+                .map = audigy2nx_map,
+                .selector_map = audigy2nx_selectors,
+        },
+        {
+                .vendor = 0x8bb, .product = 0x2702,
+                .map = linex_map,
+                .ignore_ctl_error = 1,
+        },
+        {
+                .vendor = 0xc45, .product = 0x1158,
+                .map = justlink_map,
+        },
         { 0 } /* terminator */
 };