[ALSA] usb-audio - Audigy 2 NX blinkenlights

USB generic driver
Adds mixer controls for the CMSS/Dolby Digital/Power LEDs
on the SB Audigy 2 NX.

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

1 files changed, 95 insertions, 11 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index d90d6fa7431a..ec880ff52625 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -83,6 +83,8 @@ struct usb_mixer_interface {
         struct urb *rc_urb;
         struct usb_ctrlrequest *rc_setup_packet;
         u8 rc_buffer[6];
+
+        u8 audigy2nx_leds[3];
 };
 
 
@@ -1846,6 +1848,85 @@ static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
         return 0;
 }
 
+static int snd_audigy2nx_led_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+        uinfo->count = 1;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = 1;
+        return 0;
+}
+
+static int snd_audigy2nx_led_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
+{
+        struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
+        int index = kcontrol->private_value;
+
+        ucontrol->value.integer.value[0] = mixer->audigy2nx_leds[index];
+        return 0;
+}
+
+static int snd_audigy2nx_led_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
+{
+        struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
+        int index = kcontrol->private_value;
+        int value = ucontrol->value.integer.value[0];
+        int err, changed;
+
+        if (value > 1)
+                return -EINVAL;
+        changed = value != mixer->audigy2nx_leds[index];
+        err = snd_usb_ctl_msg(mixer->chip->dev,
+                              usb_sndctrlpipe(mixer->chip->dev, 0), 0x24,
+                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+                              value, index + 2, NULL, 0, 100);
+        if (err < 0)
+                return err;
+        mixer->audigy2nx_leds[index] = value;
+        return changed;
+}
+
+static snd_kcontrol_new_t snd_audigy2nx_controls[] = {
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "CMSS LED Switch",
+                .info = snd_audigy2nx_led_info,
+                .get = snd_audigy2nx_led_get,
+                .put = snd_audigy2nx_led_put,
+                .private_value = 0,
+        },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Power LED Switch",
+                .info = snd_audigy2nx_led_info,
+                .get = snd_audigy2nx_led_get,
+                .put = snd_audigy2nx_led_put,
+                .private_value = 1,
+        },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Dolby Digital LED Switch",
+                .info = snd_audigy2nx_led_info,
+                .get = snd_audigy2nx_led_get,
+                .put = snd_audigy2nx_led_put,
+                .private_value = 2,
+        },
+};
+
+static int snd_audigy2nx_controls_create(struct usb_mixer_interface *mixer)
+{
+        int i, err;
+
+        for (i = 0; i < ARRAY_SIZE(snd_audigy2nx_controls); ++i) {
+                err = snd_ctl_add(mixer->chip->card,
+                                  snd_ctl_new1(&snd_audigy2nx_controls[i], mixer));
+                if (err < 0)
+                        return err;
+        }
+        mixer->audigy2nx_leds[1] = 1; /* Power LED is on by default */
+        return 0;
+}
+
 int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
 {
         static snd_device_ops_t dev_ops = {
@@ -1871,23 +1952,26 @@ int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
         }
 
         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
-            (err = snd_usb_mixer_status_create(mixer)) < 0) {
-                snd_usb_mixer_free(mixer);
-                return err;
-        }
+            (err = snd_usb_mixer_status_create(mixer)) < 0)
+                goto _error;
 
-        if ((err = snd_usb_soundblaster_remote_init(mixer)) < 0) {
-                snd_usb_mixer_free(mixer);
-                return err;
+        if ((err = snd_usb_soundblaster_remote_init(mixer)) < 0)
+                goto _error;
+
+        if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020)) {
+                if ((err = snd_audigy2nx_controls_create(mixer)) < 0)
+                        goto _error;
         }
 
         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
-        if (err < 0) {
-                snd_usb_mixer_free(mixer);
-                return err;
-        }
+        if (err < 0)
+                goto _error;
         list_add(&mixer->list, &chip->mixer_list);
         return 0;
+
+_error:
+        snd_usb_mixer_free(mixer);
+        return err;
 }
 
 void snd_usb_mixer_disconnect(struct list_head *p)