sound: usb: make the USB MIDI module more independent

Remove the dependecy from the USB MIDI code on the snd_usb_audio
structure.  This allows using the USB MIDI module from another driver
without having to pretend to be the generic USB audio driver.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 51 insertions, 45 deletions

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 80b2845bc48..6e89b8368d9 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -102,7 +102,8 @@ struct usb_protocol_ops {
 };
 
 struct snd_usb_midi {
-        struct snd_usb_audio *chip;
+        struct usb_device *dev;
+        struct snd_card *card;
         struct usb_interface *iface;
         const struct snd_usb_audio_quirk *quirk;
         struct snd_rawmidi *rmidi;
@@ -111,6 +112,8 @@ struct snd_usb_midi {
         struct timer_list error_timer;
         spinlock_t disc_lock;
         struct mutex mutex;
+        u32 usb_id;
+        int next_midi_device;
 
         struct snd_usb_midi_endpoint {
                 struct snd_usb_midi_out_endpoint *out;
@@ -260,7 +263,7 @@ static void snd_usbmidi_in_urb_complete(struct urb* urb)
                 }
         }
 
-        urb->dev = ep->umidi->chip->dev;
+        urb->dev = ep->umidi->dev;
         snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
 }
 
@@ -301,7 +304,7 @@ static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep)
         unsigned long flags;
 
         spin_lock_irqsave(&ep->buffer_lock, flags);
-        if (ep->umidi->chip->shutdown) {
+        if (ep->umidi->disconnected) {
                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
                 return;
         }
@@ -317,7 +320,7 @@ static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep)
 
                         dump_urb("sending", urb->transfer_buffer,
                                  urb->transfer_buffer_length);
-                        urb->dev = ep->umidi->chip->dev;
+                        urb->dev = ep->umidi->dev;
                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
                                 break;
                         ep->active_urbs |= 1 << urb_index;
@@ -354,7 +357,7 @@ static void snd_usbmidi_error_timer(unsigned long data)
                 if (in && in->error_resubmit) {
                         in->error_resubmit = 0;
                         for (j = 0; j < INPUT_URBS; ++j) {
-                                in->urbs[j]->dev = umidi->chip->dev;
+                                in->urbs[j]->dev = umidi->dev;
                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
                         }
                 }
@@ -374,7 +377,7 @@ static int send_bulk_static_data(struct snd_usb_midi_out_endpoint* ep,
                 return -ENOMEM;
         dump_urb("sending", buf, len);
         if (ep->urbs[0].urb)
-                err = usb_bulk_msg(ep->umidi->chip->dev, ep->urbs[0].urb->pipe,
+                err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
                                    buf, len, NULL, 250);
         kfree(buf);
         return err;
@@ -729,8 +732,7 @@ static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
 
         if (!ep->ports[0].active)
                 return;
-        count = snd_usb_get_speed(ep->umidi->chip->dev) == USB_SPEED_HIGH
-                ? 1 : 2;
+        count = snd_usb_get_speed(ep->umidi->dev) == USB_SPEED_HIGH ? 1 : 2;
         count = snd_rawmidi_transmit(ep->ports[0].substream,
                                      urb->transfer_buffer,
                                      count);
@@ -898,7 +900,7 @@ static void update_roland_altsetting(struct snd_usb_midi* umidi)
         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
         intfd = get_iface_desc(hostif);
         snd_usbmidi_input_stop(&umidi->list);
-        usb_set_interface(umidi->chip->dev, intfd->bInterfaceNumber,
+        usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
                           intfd->bAlternateSetting);
         snd_usbmidi_input_start(&umidi->list);
 }
@@ -913,7 +915,7 @@ static void substream_open(struct snd_rawmidi_substream *substream, int open)
                 if (umidi->opened++ == 0 && umidi->roland_load_ctl) {
                         ctl = umidi->roland_load_ctl;
                         ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
-                        snd_ctl_notify(umidi->chip->card,
+                        snd_ctl_notify(umidi->card,
                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
                         update_roland_altsetting(umidi);
                 }
@@ -921,7 +923,7 @@ static void substream_open(struct snd_rawmidi_substream *substream, int open)
                 if (--umidi->opened == 0 && umidi->roland_load_ctl) {
                         ctl = umidi->roland_load_ctl;
                         ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
-                        snd_ctl_notify(umidi->chip->card,
+                        snd_ctl_notify(umidi->card,
                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
                 }
         }
@@ -963,7 +965,7 @@ static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
 
         port->active = up;
         if (up) {
-                if (port->ep->umidi->chip->shutdown) {
+                if (port->ep->umidi->disconnected) {
                         /* gobble up remaining bytes to prevent wait in
                          * snd_rawmidi_drain_output */
                         while (!snd_rawmidi_transmit_empty(substream))
@@ -1041,7 +1043,7 @@ static struct snd_rawmidi_ops snd_usbmidi_input_ops = {
 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
                                 unsigned int buffer_length)
 {
-        usb_buffer_free(umidi->chip->dev, buffer_length,
+        usb_buffer_free(umidi->dev, buffer_length,
                         urb->transfer_buffer, urb->transfer_dma);
         usb_free_urb(urb);
 }
@@ -1088,24 +1090,24 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi* umidi,
                 }
         }
         if (ep_info->in_interval)
-                pipe = usb_rcvintpipe(umidi->chip->dev, ep_info->in_ep);
+                pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
         else
-                pipe = usb_rcvbulkpipe(umidi->chip->dev, ep_info->in_ep);
-        length = usb_maxpacket(umidi->chip->dev, pipe, 0);
+                pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
+        length = usb_maxpacket(umidi->dev, pipe, 0);
         for (i = 0; i < INPUT_URBS; ++i) {
-                buffer = usb_buffer_alloc(umidi->chip->dev, length, GFP_KERNEL,
+                buffer = usb_buffer_alloc(umidi->dev, length, GFP_KERNEL,
                                           &ep->urbs[i]->transfer_dma);
                 if (!buffer) {
                         snd_usbmidi_in_endpoint_delete(ep);
                         return -ENOMEM;
                 }
                 if (ep_info->in_interval)
-                        usb_fill_int_urb(ep->urbs[i], umidi->chip->dev,
+                        usb_fill_int_urb(ep->urbs[i], umidi->dev,
                                          pipe, buffer, length,
                                          snd_usbmidi_in_urb_complete,
                                          ep, ep_info->in_interval);
                 else
-                        usb_fill_bulk_urb(ep->urbs[i], umidi->chip->dev,
+                        usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
                                           pipe, buffer, length,
                                           snd_usbmidi_in_urb_complete, ep);
                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
@@ -1157,15 +1159,15 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
                 ep->urbs[i].ep = ep;
         }
         if (ep_info->out_interval)
-                pipe = usb_sndintpipe(umidi->chip->dev, ep_info->out_ep);
+                pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
         else
-                pipe = usb_sndbulkpipe(umidi->chip->dev, ep_info->out_ep);
-        if (umidi->chip->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */
+                pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
+        if (umidi->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */
                 ep->max_transfer = 4;
         else
-                ep->max_transfer = usb_maxpacket(umidi->chip->dev, pipe, 1);
+                ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
         for (i = 0; i < OUTPUT_URBS; ++i) {
-                buffer = usb_buffer_alloc(umidi->chip->dev,
+                buffer = usb_buffer_alloc(umidi->dev,
                                           ep->max_transfer, GFP_KERNEL,
                                           &ep->urbs[i].urb->transfer_dma);
                 if (!buffer) {
@@ -1173,12 +1175,12 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
                         return -ENOMEM;
                 }
                 if (ep_info->out_interval)
-                        usb_fill_int_urb(ep->urbs[i].urb, umidi->chip->dev,
+                        usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
                                          pipe, buffer, ep->max_transfer,
                                          snd_usbmidi_out_urb_complete,
                                          &ep->urbs[i], ep_info->out_interval);
                 else
-                        usb_fill_bulk_urb(ep->urbs[i].urb, umidi->chip->dev,
+                        usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
                                           pipe, buffer, ep->max_transfer,
                                           snd_usbmidi_out_urb_complete,
                                           &ep->urbs[i]);
@@ -1412,7 +1414,7 @@ static struct port_info *find_port_info(struct snd_usb_midi* umidi, int number)
         int i;
 
         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
-                if (snd_usbmidi_port_info[i].id == umidi->chip->usb_id &&
+                if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
                     snd_usbmidi_port_info[i].port == number)
                         return &snd_usbmidi_port_info[i];
         }
@@ -1450,7 +1452,7 @@ static void snd_usbmidi_init_substream(struct snd_usb_midi* umidi,
         port_info = find_port_info(umidi, number);
         name_format = port_info ? port_info->name : "%s MIDI %d";
         snprintf(substream->name, sizeof(substream->name),
-                 name_format, umidi->chip->card->shortname, number + 1);
+                 name_format, umidi->card->shortname, number + 1);
 
         *rsubstream = substream;
 }
@@ -1548,7 +1550,7 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
                         if (usb_endpoint_xfer_int(ep))
                                 endpoints[epidx].out_interval = ep->bInterval;
-                        else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)
+                        else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
                                 /*
                                  * Low speed bulk transfers don't exist, so
                                  * force interrupt transfers for devices like
@@ -1568,7 +1570,7 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
                         if (usb_endpoint_xfer_int(ep))
                                 endpoints[epidx].in_interval = ep->bInterval;
-                        else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)
+                        else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
                                 endpoints[epidx].in_interval = 1;
                         endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
@@ -1647,11 +1649,11 @@ static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi* umidi)
 
         snd_printdd(KERN_INFO "switching to altsetting %d with int ep\n",
                     intfd->bAlternateSetting);
-        usb_set_interface(umidi->chip->dev, intfd->bInterfaceNumber,
+        usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
                           intfd->bAlternateSetting);
 
         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
-        if (snd_ctl_add(umidi->chip->card, umidi->roland_load_ctl) < 0)
+        if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
                 umidi->roland_load_ctl = NULL;
 }
 
@@ -1668,7 +1670,7 @@ static int snd_usbmidi_detect_endpoints(struct snd_usb_midi* umidi,
         struct usb_endpoint_descriptor* epd;
         int i, out_eps = 0, in_eps = 0;
 
-        if (USB_ID_VENDOR(umidi->chip->usb_id) == 0x0582)
+        if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
                 snd_usbmidi_switch_roland_altsetting(umidi);
 
         if (endpoint[0].out_ep || endpoint[0].in_ep)
@@ -1855,12 +1857,12 @@ static int snd_usbmidi_create_rawmidi(struct snd_usb_midi* umidi,
         struct snd_rawmidi *rmidi;
         int err;
 
-        err = snd_rawmidi_new(umidi->chip->card, "USB MIDI",
-                              umidi->chip->next_midi_device++,
+        err = snd_rawmidi_new(umidi->card, "USB MIDI",
+                              umidi->next_midi_device++,
                               out_ports, in_ports, &rmidi);
         if (err < 0)
                 return err;
-        strcpy(rmidi->name, umidi->chip->card->shortname);
+        strcpy(rmidi->name, umidi->card->shortname);
         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
                             SNDRV_RAWMIDI_INFO_INPUT |
                             SNDRV_RAWMIDI_INFO_DUPLEX;
@@ -1899,7 +1901,7 @@ static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
                 return;
         for (i = 0; i < INPUT_URBS; ++i) {
                 struct urb* urb = ep->urbs[i];
-                urb->dev = ep->umidi->chip->dev;
+                urb->dev = ep->umidi->dev;
                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
         }
 }
@@ -1920,9 +1922,10 @@ void snd_usbmidi_input_start(struct list_head* p)
 /*
  * Creates and registers everything needed for a MIDI streaming interface.
  */
-int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
-                                  struct usb_interface* iface,
-                                  const struct snd_usb_audio_quirk* quirk)
+int snd_usbmidi_create(struct snd_card *card,
+                       struct usb_interface* iface,
+                       struct list_head *midi_list,
+                       const struct snd_usb_audio_quirk* quirk)
 {
         struct snd_usb_midi* umidi;
         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
@@ -1932,13 +1935,16 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
         if (!umidi)
                 return -ENOMEM;
-        umidi->chip = chip;
+        umidi->dev = interface_to_usbdev(iface);
+        umidi->card = card;
         umidi->iface = iface;
         umidi->quirk = quirk;
         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
         init_timer(&umidi->error_timer);
         spin_lock_init(&umidi->disc_lock);
         mutex_init(&umidi->mutex);
+        umidi->usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
+                               le16_to_cpu(umidi->dev->descriptor.idProduct));
         umidi->error_timer.function = snd_usbmidi_error_timer;
         umidi->error_timer.data = (unsigned long)umidi;
 
@@ -1947,7 +1953,7 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
         case QUIRK_MIDI_STANDARD_INTERFACE:
                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
-                if (chip->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
+                if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
                         umidi->usb_protocol_ops =
                                 &snd_usbmidi_maudio_broken_running_status_ops;
                 break;
@@ -1983,7 +1989,7 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
                  * interface 0, so we have to make sure that the USB core looks
                  * again at interface 0 by calling usb_set_interface() on it.
                  */
-                usb_set_interface(umidi->chip->dev, 0, 0);
+                usb_set_interface(umidi->dev, 0, 0);
                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
                 break;
         case QUIRK_MIDI_EMAGIC:
@@ -2029,14 +2035,14 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
                 return err;
         }
 
-        list_add(&umidi->list, &umidi->chip->midi_list);
+        list_add_tail(&umidi->list, midi_list);
 
         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
         return 0;
 }
 
-EXPORT_SYMBOL(snd_usb_create_midi_interface);
+EXPORT_SYMBOL(snd_usbmidi_create);
 EXPORT_SYMBOL(snd_usbmidi_input_stop);
 EXPORT_SYMBOL(snd_usbmidi_input_start);
 EXPORT_SYMBOL(snd_usbmidi_disconnect);