1 files changed, 521 insertions, 67 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 5f1906915aa6..e73c1c9d3e73 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -35,10 +35,11 @@
 #include <linux/usb.h>
 #include <sound/core.h>
 #include <sound/control.h>
+#include <sound/hwdep.h>
+#include <sound/info.h>
 
 #include "usbaudio.h"
 
-
 /*
  */
 
@@ -50,6 +51,31 @@ typedef struct usb_audio_term usb_audio_term_t;
 typedef struct usb_mixer_elem_info usb_mixer_elem_info_t;
 
 
+struct usb_mixer_interface {
+        snd_usb_audio_t *chip;
+        unsigned int ctrlif;
+        struct list_head list;
+        unsigned int ignore_ctl_error;
+        struct urb *urb;
+        usb_mixer_elem_info_t **id_elems; /* array[256], indexed by unit id */
+
+        /* Sound Blaster remote control stuff */
+        enum {
+                RC_NONE,
+                RC_EXTIGY,
+                RC_AUDIGY2NX,
+        } rc_type;
+        unsigned long rc_hwdep_open;
+        u32 rc_code;
+        wait_queue_head_t rc_waitq;
+        struct urb *rc_urb;
+        struct usb_ctrlrequest *rc_setup_packet;
+        u8 rc_buffer[6];
+
+        u8 audigy2nx_leds[3];
+};
+
+
 struct usb_audio_term {
         int id;
         int type;
@@ -62,26 +88,26 @@ struct usbmix_name_map;
 
 struct usb_mixer_build {
         snd_usb_audio_t *chip;
+        struct usb_mixer_interface *mixer;
         unsigned char *buffer;
         unsigned int buflen;
-        unsigned int ctrlif;
-        unsigned short vendor;
-        unsigned short product;
-        DECLARE_BITMAP(unitbitmap, 32*32);
+        DECLARE_BITMAP(unitbitmap, 256);
         usb_audio_term_t oterm;
         const struct usbmix_name_map *map;
+        const struct usbmix_selector_map *selector_map;
 };
 
 struct usb_mixer_elem_info {
-        snd_usb_audio_t *chip;
-        unsigned int ctrlif;
+        struct usb_mixer_interface *mixer;
+        usb_mixer_elem_info_t *next_id_elem; /* list of controls with same id */
+        snd_ctl_elem_id_t *elem_id;
         unsigned int id;
         unsigned int control;   /* CS or ICN (high byte) */
         unsigned int cmask; /* channel mask bitmap: 0 = master */
         int channels;
         int val_type;
         int min, max, res;
-        unsigned int initialized: 1;
+        u8 initialized;
 };
 
 
@@ -187,6 +213,21 @@ 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
  */
@@ -301,16 +342,18 @@ static int get_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, i
         int timeout = 10;
 
         while (timeout-- > 0) {
-                if (snd_usb_ctl_msg(cval->chip->dev, usb_rcvctrlpipe(cval->chip->dev, 0),
+                if (snd_usb_ctl_msg(cval->mixer->chip->dev,
+                                    usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
                                     request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
-                                    validx, cval->ctrlif | (cval->id << 8),
+                                    validx, cval->mixer->ctrlif | (cval->id << 8),
                                     buf, val_len, 100) >= 0) {
                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
                         return 0;
                 }
         }
-        snd_printdd(KERN_ERR "cannot get ctl value: req = 0x%x, wValue = 0x%x, wIndex = 0x%x, type = %d\n", request, validx, cval->ctrlif | (cval->id << 8), cval->val_type);
+        snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
+                    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
         return -EINVAL;
 }
 
@@ -339,13 +382,15 @@ static int set_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, i
         buf[0] = value_set & 0xff;
         buf[1] = (value_set >> 8) & 0xff;
         while (timeout -- > 0)
-                if (snd_usb_ctl_msg(cval->chip->dev, usb_sndctrlpipe(cval->chip->dev, 0),
+                if (snd_usb_ctl_msg(cval->mixer->chip->dev,
+                                    usb_sndctrlpipe(cval->mixer->chip->dev, 0),
                                     request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
-                                    validx, cval->ctrlif | (cval->id << 8),
+                                    validx, cval->mixer->ctrlif | (cval->id << 8),
                                     buf, val_len, 100) >= 0)
                         return 0;
-        snd_printdd(KERN_ERR "cannot set ctl value: req = 0x%x, wValue = 0x%x, wIndex = 0x%x, type = %d, data = 0x%x/0x%x\n", request, validx, cval->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
+        snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
+                    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
         return -EINVAL;
 }
 
@@ -385,16 +430,22 @@ static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_ou
  * if failed, give up and free the control instance.
  */
 
-static int add_control_to_empty(snd_card_t *card, snd_kcontrol_t *kctl)
+static int add_control_to_empty(mixer_build_t *state, snd_kcontrol_t *kctl)
 {
+        usb_mixer_elem_info_t *cval = kctl->private_data;
         int err;
-        while (snd_ctl_find_id(card, &kctl->id))
+
+        while (snd_ctl_find_id(state->chip->card, &kctl->id))
                 kctl->id.index++;
-        if ((err = snd_ctl_add(card, kctl)) < 0) {
+        if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
                 snd_ctl_free_one(kctl);
+                return err;
         }
-        return err;
+        cval->elem_id = &kctl->id;
+        cval->next_id_elem = state->mixer->id_elems[cval->id];
+        state->mixer->id_elems[cval->id] = cval;
+        return 0;
 }
 
 
@@ -572,10 +623,8 @@ static struct usb_feature_control_info audio_feature_info[] = {
 /* private_free callback */
 static void usb_mixer_elem_free(snd_kcontrol_t *kctl)
 {
-        if (kctl->private_data) {
-                kfree(kctl->private_data);
-                kctl->private_data = NULL;
-        }
+        kfree(kctl->private_data);
+        kctl->private_data = NULL;
 }
 
 
@@ -608,7 +657,8 @@ static int get_min_max(usb_mixer_elem_info_t *cval, int default_min)
                 }
                 if (get_ctl_value(cval, GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
                     get_ctl_value(cval, GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
-                        snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n", cval->id, cval->ctrlif, cval->control, cval->id);
+                        snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
+                                   cval->id, cval->mixer->ctrlif, cval->control, cval->id);
                         return -EINVAL;
                 }
                 if (get_ctl_value(cval, GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
@@ -668,7 +718,7 @@ static int mixer_ctl_feature_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
                         if (cval->cmask & (1 << c)) {
                                 err = get_cur_mix_value(cval, c + 1, &val);
                                 if (err < 0) {
-                                        if (cval->chip->ignore_ctl_error) {
+                                        if (cval->mixer->ignore_ctl_error) {
                                                 ucontrol->value.integer.value[0] = cval->min;
                                                 return 0;
                                         }
@@ -684,7 +734,7 @@ static int mixer_ctl_feature_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
                 /* master channel */
                 err = get_cur_mix_value(cval, 0, &val);
                 if (err < 0) {
-                        if (cval->chip->ignore_ctl_error) {
+                        if (cval->mixer->ignore_ctl_error) {
                                 ucontrol->value.integer.value[0] = cval->min;
                                 return 0;
                         }
@@ -710,7 +760,7 @@ static int mixer_ctl_feature_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
                         if (cval->cmask & (1 << c)) {
                                 err = get_cur_mix_value(cval, c + 1, &oval);
                                 if (err < 0) {
-                                        if (cval->chip->ignore_ctl_error)
+                                        if (cval->mixer->ignore_ctl_error)
                                                 return 0;
                                         return err;
                                 }
@@ -727,7 +777,7 @@ static int mixer_ctl_feature_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
         } else {
                 /* master channel */
                 err = get_cur_mix_value(cval, 0, &oval);
-                if (err < 0 && cval->chip->ignore_ctl_error)
+                if (err < 0 && cval->mixer->ignore_ctl_error)
                         return 0;
                 if (err < 0)
                         return err;
@@ -779,8 +829,7 @@ static void build_feature_ctl(mixer_build_t *state, unsigned char *desc,
                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
                 return;
         }
-        cval->chip = state->chip;
-        cval->ctrlif = state->ctrlif;
+        cval->mixer = state->mixer;
         cval->id = unitid;
         cval->control = control;
         cval->cmask = ctl_mask;
@@ -855,16 +904,21 @@ static void build_feature_ctl(mixer_build_t *state, unsigned char *desc,
         /* note that detection between firmware 2.1.1.7 (N101) and later 2.1.1.21 */
         /* is not very clear from datasheets */
         /* I hope that the min value is -15360 for newer firmware --jk */
-        if (((state->vendor == 0x471 && (state->product == 0x104 || state->product == 0x105 || state->product == 0x101)) ||
-             (state->vendor == 0x672 && state->product == 0x1041)) && !strcmp(kctl->id.name, "PCM Playback Volume") &&
-             cval->min == -15616) {
-                snd_printk("USB Audio: using volume control quirk for the UDA1321/N101 chip\n");
-                cval->max = -256;
+        switch (state->chip->usb_id) {
+        case USB_ID(0x0471, 0x0101):
+        case USB_ID(0x0471, 0x0104):
+        case USB_ID(0x0471, 0x0105):
+        case USB_ID(0x0672, 0x1041):
+                if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
+                    cval->min == -15616) {
+                        snd_printk("using volume control quirk for the UDA1321/N101 chip\n");
+                        cval->max = -256;
+                }
         }
 
         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
-        add_control_to_empty(state->chip->card, kctl);
+        add_control_to_empty(state, kctl);
 }
 
 
@@ -947,8 +1001,7 @@ static void build_mixer_unit_ctl(mixer_build_t *state, unsigned char *desc,
         if (! cval)
                 return;
 
-        cval->chip = state->chip;
-        cval->ctrlif = state->ctrlif;
+        cval->mixer = state->mixer;
         cval->id = unitid;
         cval->control = in_ch + 1; /* based on 1 */
         cval->val_type = USB_MIXER_S16;
@@ -979,7 +1032,7 @@ static void build_mixer_unit_ctl(mixer_build_t *state, unsigned char *desc,
 
         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
-        add_control_to_empty(state->chip->card, kctl);
+        add_control_to_empty(state, kctl);
 }
 
 
@@ -1042,7 +1095,7 @@ static int mixer_ctl_procunit_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
         int err, val;
 
         err = get_cur_ctl_value(cval, cval->control << 8, &val);
-        if (err < 0 && cval->chip->ignore_ctl_error) {
+        if (err < 0 && cval->mixer->ignore_ctl_error) {
                 ucontrol->value.integer.value[0] = cval->min;
                 return 0;
         }
@@ -1061,7 +1114,7 @@ static int mixer_ctl_procunit_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
 
         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
         if (err < 0) {
-                if (cval->chip->ignore_ctl_error)
+                if (cval->mixer->ignore_ctl_error)
                         return 0;
                 return err;
         }
@@ -1179,9 +1232,6 @@ static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char
         }
 
         type = combine_word(&dsc[4]);
-        if (! type)
-                return 0; /* undefined? */
-
         for (info = list; info && info->type; info++)
                 if (info->type == type)
                         break;
@@ -1199,8 +1249,7 @@ static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char
                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
                         return -ENOMEM;
                 }
-                cval->chip = state->chip;
-                cval->ctrlif = state->ctrlif;
+                cval->mixer = state->mixer;
                 cval->id = unitid;
                 cval->control = valinfo->control;
                 cval->val_type = valinfo->val_type;
@@ -1241,7 +1290,7 @@ static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char
 
                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
-                if ((err = add_control_to_empty(state->chip->card, kctl)) < 0)
+                if ((err = add_control_to_empty(state, kctl)) < 0)
                         return err;
         }
         return 0;
@@ -1289,7 +1338,7 @@ static int mixer_ctl_selector_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
 
         err = get_cur_ctl_value(cval, 0, &val);
         if (err < 0) {
-                if (cval->chip->ignore_ctl_error) {
+                if (cval->mixer->ignore_ctl_error) {
                         ucontrol->value.enumerated.item[0] = 0;
                         return 0;
                 }
@@ -1308,7 +1357,7 @@ static int mixer_ctl_selector_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t
 
         err = get_cur_ctl_value(cval, 0, &oval);
         if (err < 0) {
-                if (cval->chip->ignore_ctl_error)
+                if (cval->mixer->ignore_ctl_error)
                         return 0;
                 return err;
         }
@@ -1386,8 +1435,7 @@ static int parse_audio_selector_unit(mixer_build_t *state, int unitid, unsigned
                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
                 return -ENOMEM;
         }
-        cval->chip = state->chip;
-        cval->ctrlif = state->ctrlif;
+        cval->mixer = state->mixer;
         cval->id = unitid;
         cval->val_type = USB_MIXER_U8;
         cval->channels = 1;
@@ -1415,7 +1463,9 @@ 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);
@@ -1450,7 +1500,7 @@ static int parse_audio_selector_unit(mixer_build_t *state, int unitid, unsigned
 
         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
                     cval->id, kctl->id.name, num_ins);
-        if ((err = add_control_to_empty(state->chip->card, kctl)) < 0)
+        if ((err = add_control_to_empty(state, kctl)) < 0)
                 return err;
 
         return 0;
@@ -1493,41 +1543,55 @@ static int parse_audio_unit(mixer_build_t *state, int unitid)
         }
 }
 
+static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
+{
+        kfree(mixer->id_elems);
+        if (mixer->urb) {
+                kfree(mixer->urb->transfer_buffer);
+                usb_free_urb(mixer->urb);
+        }
+        if (mixer->rc_urb)
+                usb_free_urb(mixer->rc_urb);
+        kfree(mixer->rc_setup_packet);
+        kfree(mixer);
+}
+
+static int snd_usb_mixer_dev_free(snd_device_t *device)
+{
+        struct usb_mixer_interface *mixer = device->device_data;
+        snd_usb_mixer_free(mixer);
+        return 0;
+}
+
 /*
  * create mixer controls
  *
  * walk through all OUTPUT_TERMINAL descriptors to search for mixers
  */
-int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
+static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
 {
         unsigned char *desc;
         mixer_build_t state;
         int err;
         const struct usbmix_ctl_map *map;
-        struct usb_device_descriptor *dev = &chip->dev->descriptor;
-        struct usb_host_interface *hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
-
-        strcpy(chip->card->mixername, "USB Mixer");
+        struct usb_host_interface *hostif;
 
+        hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
         memset(&state, 0, sizeof(state));
-        state.chip = chip;
+        state.chip = mixer->chip;
+        state.mixer = mixer;
         state.buffer = hostif->extra;
         state.buflen = hostif->extralen;
-        state.ctrlif = ctrlif;
-        state.vendor = le16_to_cpu(dev->idVendor);
-        state.product = le16_to_cpu(dev->idProduct);
 
         /* check the mapping table */
-        for (map = usbmix_ctl_maps; map->vendor; map++) {
-                if (map->vendor == state.vendor && map->product == state.product) {
+        for (map = usbmix_ctl_maps; map->id; map++) {
+                if (map->id == state.chip->usb_id) {
                         state.map = map->map;
-                        chip->ignore_ctl_error = map->ignore_ctl_error;
+                        state.selector_map = map->selector_map;
+                        mixer->ignore_ctl_error = map->ignore_ctl_error;
                         break;
                 }
         }
-#ifdef IGNORE_CTL_ERROR
-        chip->ignore_ctl_error = 1;
-#endif
 
         desc = NULL;
         while ((desc = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, desc, OUTPUT_TERMINAL)) != NULL) {
@@ -1543,3 +1607,393 @@ int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
         }
         return 0;
 }
+
+static void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer,
+                                    int unitid)
+{
+        usb_mixer_elem_info_t *info;
+
+        for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
+                snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                               info->elem_id);
+}
+
+static void snd_usb_mixer_memory_change(struct usb_mixer_interface *mixer,
+                                        int unitid)
+{
+        if (mixer->rc_type == RC_NONE)
+                return;
+        /* unit ids specific to Extigy/Audigy 2 NX: */
+        switch (unitid) {
+        case 0: /* remote control */
+                mixer->rc_urb->dev = mixer->chip->dev;
+                usb_submit_urb(mixer->rc_urb, GFP_ATOMIC);
+                break;
+        case 4: /* digital in jack */
+        case 7: /* line in jacks */
+        case 19: /* speaker out jacks */
+        case 20: /* headphones out jack */
+                break;
+        default:
+                snd_printd(KERN_DEBUG "memory change in unknown unit %d\n", unitid);
+                break;
+        }
+}
+
+static void snd_usb_mixer_status_complete(struct urb *urb, struct pt_regs *regs)
+{
+        struct usb_mixer_interface *mixer = urb->context;
+
+        if (urb->status == 0) {
+                u8 *buf = urb->transfer_buffer;
+                int i;
+
+                for (i = urb->actual_length; i >= 2; buf += 2, i -= 2) {
+                        snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
+                                   buf[0], buf[1]);
+                        /* ignore any notifications not from the control interface */
+                        if ((buf[0] & 0x0f) != 0)
+                                continue;
+                        if (!(buf[0] & 0x40))
+                                snd_usb_mixer_notify_id(mixer, buf[1]);
+                        else
+                                snd_usb_mixer_memory_change(mixer, buf[1]);
+                }
+        }
+        if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
+                urb->dev = mixer->chip->dev;
+                usb_submit_urb(urb, GFP_ATOMIC);
+        }
+}
+
+/* create the handler for the optional status interrupt endpoint */
+static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
+{
+        struct usb_host_interface *hostif;
+        struct usb_endpoint_descriptor *ep;
+        void *transfer_buffer;
+        int buffer_length;
+        unsigned int epnum;
+
+        hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
+        /* we need one interrupt input endpoint */
+        if (get_iface_desc(hostif)->bNumEndpoints < 1)
+                return 0;
+        ep = get_endpoint(hostif, 0);
+        if ((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) != USB_DIR_IN ||
+            (ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
+                return 0;
+
+        epnum = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+        buffer_length = le16_to_cpu(ep->wMaxPacketSize);
+        transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
+        if (!transfer_buffer)
+                return -ENOMEM;
+        mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
+        if (!mixer->urb) {
+                kfree(transfer_buffer);
+                return -ENOMEM;
+        }
+        usb_fill_int_urb(mixer->urb, mixer->chip->dev,
+                         usb_rcvintpipe(mixer->chip->dev, epnum),
+                         transfer_buffer, buffer_length,
+                         snd_usb_mixer_status_complete, mixer, ep->bInterval);
+        usb_submit_urb(mixer->urb, GFP_KERNEL);
+        return 0;
+}
+
+static void snd_usb_soundblaster_remote_complete(struct urb *urb,
+                                                 struct pt_regs *regs)
+{
+        struct usb_mixer_interface *mixer = urb->context;
+        /*
+         * format of remote control data:
+         * Extigy:      xx 00
+         * Audigy 2 NX: 06 80 xx 00 00 00
+         */
+        int offset = mixer->rc_type == RC_EXTIGY ? 0 : 2;
+        u32 code;
+
+        if (urb->status < 0 || urb->actual_length <= offset)
+                return;
+        code = mixer->rc_buffer[offset];
+        /* the Mute button actually changes the mixer control */
+        if (code == 13)
+                snd_usb_mixer_notify_id(mixer, 18);
+        mixer->rc_code = code;
+        wmb();
+        wake_up(&mixer->rc_waitq);
+}
+
+static int snd_usb_sbrc_hwdep_open(snd_hwdep_t *hw, struct file *file)
+{
+        struct usb_mixer_interface *mixer = hw->private_data;
+
+        if (test_and_set_bit(0, &mixer->rc_hwdep_open))
+                return -EBUSY;
+        return 0;
+}
+
+static int snd_usb_sbrc_hwdep_release(snd_hwdep_t *hw, struct file *file)
+{
+        struct usb_mixer_interface *mixer = hw->private_data;
+
+        clear_bit(0, &mixer->rc_hwdep_open);
+        smp_mb__after_clear_bit();
+        return 0;
+}
+
+static long snd_usb_sbrc_hwdep_read(snd_hwdep_t *hw, char __user *buf,
+                                     long count, loff_t *offset)
+{
+        struct usb_mixer_interface *mixer = hw->private_data;
+        int err;
+        u32 rc_code;
+
+        if (count != 1 && count != 4)
+                return -EINVAL;
+        err = wait_event_interruptible(mixer->rc_waitq,
+                                       (rc_code = xchg(&mixer->rc_code, 0)) != 0);
+        if (err == 0) {
+                if (count == 1)
+                        err = put_user(rc_code, buf);
+                else
+                        err = put_user(rc_code, (u32 __user *)buf);
+        }
+        return err < 0 ? err : count;
+}
+
+static unsigned int snd_usb_sbrc_hwdep_poll(snd_hwdep_t *hw, struct file *file,
+                                            poll_table *wait)
+{
+        struct usb_mixer_interface *mixer = hw->private_data;
+
+        poll_wait(file, &mixer->rc_waitq, wait);
+        return mixer->rc_code ? POLLIN | POLLRDNORM : 0;
+}
+
+static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
+{
+        snd_hwdep_t *hwdep;
+        int err, len;
+
+        switch (mixer->chip->usb_id) {
+        case USB_ID(0x041e, 0x3000):
+                mixer->rc_type = RC_EXTIGY;
+                len = 2;
+                break;
+        case USB_ID(0x041e, 0x3020):
+                mixer->rc_type = RC_AUDIGY2NX;
+                len = 6;
+                break;
+        default:
+                return 0;
+        }
+
+        init_waitqueue_head(&mixer->rc_waitq);
+        err = snd_hwdep_new(mixer->chip->card, "SB remote control", 0, &hwdep);
+        if (err < 0)
+                return err;
+        snprintf(hwdep->name, sizeof(hwdep->name),
+                 "%s remote control", mixer->chip->card->shortname);
+        hwdep->iface = SNDRV_HWDEP_IFACE_SB_RC;
+        hwdep->private_data = mixer;
+        hwdep->ops.read = snd_usb_sbrc_hwdep_read;
+        hwdep->ops.open = snd_usb_sbrc_hwdep_open;
+        hwdep->ops.release = snd_usb_sbrc_hwdep_release;
+        hwdep->ops.poll = snd_usb_sbrc_hwdep_poll;
+
+        mixer->rc_urb = usb_alloc_urb(0, GFP_KERNEL);
+        if (!mixer->rc_urb)
+                return -ENOMEM;
+        mixer->rc_setup_packet = kmalloc(sizeof(*mixer->rc_setup_packet), GFP_KERNEL);
+        if (!mixer->rc_setup_packet) {
+                usb_free_urb(mixer->rc_urb);
+                mixer->rc_urb = NULL;
+                return -ENOMEM;
+        }
+        mixer->rc_setup_packet->bRequestType =
+                USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
+        mixer->rc_setup_packet->bRequest = GET_MEM;
+        mixer->rc_setup_packet->wValue = cpu_to_le16(0);
+        mixer->rc_setup_packet->wIndex = cpu_to_le16(0);
+        mixer->rc_setup_packet->wLength = cpu_to_le16(len);
+        usb_fill_control_urb(mixer->rc_urb, mixer->chip->dev,
+                             usb_rcvctrlpipe(mixer->chip->dev, 0),
+                             (u8*)mixer->rc_setup_packet, mixer->rc_buffer, len,
+                             snd_usb_soundblaster_remote_complete, 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;
+}
+
+static void snd_audigy2nx_proc_read(snd_info_entry_t *entry,
+                                    snd_info_buffer_t *buffer)
+{
+        static const struct {
+                int unitid;
+                const char *name;
+        } jacks[] = {
+                {4,  "dig in "},
+                {7,  "line in"},
+                {19, "spk out"},
+                {20, "hph out"},
+        };
+        struct usb_mixer_interface *mixer = entry->private_data;
+        int i, err;
+        u8 buf[3];
+
+        snd_iprintf(buffer, "%s jacks\n\n", mixer->chip->card->shortname);
+        for (i = 0; i < ARRAY_SIZE(jacks); ++i) {
+                snd_iprintf(buffer, "%s: ", jacks[i].name);
+                err = snd_usb_ctl_msg(mixer->chip->dev,
+                                      usb_rcvctrlpipe(mixer->chip->dev, 0),
+                                      GET_MEM, USB_DIR_IN | USB_TYPE_CLASS |
+                                      USB_RECIP_INTERFACE, 0,
+                                      jacks[i].unitid << 8, buf, 3, 100);
+                if (err == 3 && buf[0] == 3)
+                        snd_iprintf(buffer, "%02x %02x\n", buf[1], buf[2]);
+                else
+                        snd_iprintf(buffer, "?\n");
+        }
+}
+
+int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
+{
+        static snd_device_ops_t dev_ops = {
+                .dev_free = snd_usb_mixer_dev_free
+        };
+        struct usb_mixer_interface *mixer;
+        int err;
+
+        strcpy(chip->card->mixername, "USB Mixer");
+
+        mixer = kcalloc(1, sizeof(*mixer), GFP_KERNEL);
+        if (!mixer)
+                return -ENOMEM;
+        mixer->chip = chip;
+        mixer->ctrlif = ctrlif;
+#ifdef IGNORE_CTL_ERROR
+        mixer->ignore_ctl_error = 1;
+#endif
+        mixer->id_elems = kcalloc(256, sizeof(*mixer->id_elems), GFP_KERNEL);
+        if (!mixer->id_elems) {
+                kfree(mixer);
+                return -ENOMEM;
+        }
+
+        if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
+            (err = snd_usb_mixer_status_create(mixer)) < 0)
+                goto _error;
+
+        if ((err = snd_usb_soundblaster_remote_init(mixer)) < 0)
+                goto _error;
+
+        if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020)) {
+                snd_info_entry_t *entry;
+
+                if ((err = snd_audigy2nx_controls_create(mixer)) < 0)
+                        goto _error;
+                if (!snd_card_proc_new(chip->card, "audigy2nx", &entry))
+                        snd_info_set_text_ops(entry, mixer, 1024,
+                                              snd_audigy2nx_proc_read);
+        }
+
+        err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
+        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)
+{
+        struct usb_mixer_interface *mixer;
+        
+        mixer = list_entry(p, struct usb_mixer_interface, list);
+        if (mixer->urb)
+                usb_kill_urb(mixer->urb);
+        if (mixer->rc_urb)
+                usb_kill_urb(mixer->rc_urb);
+}