ALSA: usb-audio: Manage number of rawmidis globally

We're going to create rawmidi objects for MIDI 2.0 in a different code
from the current code for USB-MIDI 1.0.  As a preliminary work, this
patch adds the number of rawmidi objects to keep globally in a
USB-audio card instance, so that it can be referred from both MIDI 1.0
and 2.0 code.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-8-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/card.c b/sound/usb/card.c
index f6e99ce..bd051e6 100644 (file)
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -179,8 +179,9 @@ static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int int
             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
            altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
                int err = __snd_usbmidi_create(chip->card, iface,
-                                            &chip->midi_list, NULL,
-                                            chip->usb_id);
+                                              &chip->midi_list, NULL,
+                                              chip->usb_id,
+                                              &chip->num_rawmidis);
                if (err < 0) {
                        dev_err(&dev->dev,
                                "%u:%d: cannot create sequencer device\n",

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 2839f6b..6b09932 100644 (file)
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2461,7 +2461,8 @@ int __snd_usbmidi_create(struct snd_card *card,
                         struct usb_interface *iface,
                         struct list_head *midi_list,
                         const struct snd_usb_audio_quirk *quirk,
-                        unsigned int usb_id)
+                        unsigned int usb_id,
+                        unsigned int *num_rawmidis)
 {
        struct snd_usb_midi *umidi;
        struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
@@ -2476,6 +2477,8 @@ int __snd_usbmidi_create(struct snd_card *card,
        umidi->iface = iface;
        umidi->quirk = quirk;
        umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
+       if (num_rawmidis)
+               umidi->next_midi_device = *num_rawmidis;
        spin_lock_init(&umidi->disc_lock);
        init_rwsem(&umidi->disc_rwsem);
        mutex_init(&umidi->mutex);
@@ -2595,6 +2598,8 @@ int __snd_usbmidi_create(struct snd_card *card,
        usb_autopm_get_interface_no_resume(umidi->iface);
 
        list_add_tail(&umidi->list, midi_list);
+       if (num_rawmidis)
+               *num_rawmidis = umidi->next_midi_device;
        return 0;
 
 free_midi:

diff --git a/sound/usb/midi.h b/sound/usb/midi.h
index 3f15319..2100f14 100644 (file)
--- a/sound/usb/midi.h
+++ b/sound/usb/midi.h
@@ -46,14 +46,15 @@ int __snd_usbmidi_create(struct snd_card *card,
                         struct usb_interface *iface,
                         struct list_head *midi_list,
                         const struct snd_usb_audio_quirk *quirk,
-                        unsigned int usb_id);
+                        unsigned int usb_id,
+                        unsigned int *num_rawmidis);
 
 static inline int snd_usbmidi_create(struct snd_card *card,
                       struct usb_interface *iface,
                       struct list_head *midi_list,
                       const struct snd_usb_audio_quirk *quirk)
 {
-       return __snd_usbmidi_create(card, iface, midi_list, quirk, 0);
+       return __snd_usbmidi_create(card, iface, midi_list, quirk, 0, NULL);
 }
 
 void snd_usbmidi_input_stop(struct list_head *p);

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 3ecd1ba..1cabe4c 100644 (file)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -436,8 +436,9 @@ static int create_uaxx_quirk(struct snd_usb_audio *chip,
                        chip->usb_id == USB_ID(0x0582, 0x002b)
                        ? &ua700_quirk : &uaxx_quirk;
                return __snd_usbmidi_create(chip->card, iface,
-                                         &chip->midi_list, quirk,
-                                         chip->usb_id);
+                                           &chip->midi_list, quirk,
+                                           chip->usb_id,
+                                           &chip->num_rawmidis);
        }
 
        if (altsd->bNumEndpoints != 1)

diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 38a85b2..b1fa0a3 100644 (file)
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -49,6 +49,7 @@ struct snd_usb_audio {
        struct list_head clock_ref_list; /* list of clock refcounts */
        int pcm_devs;
 
+       unsigned int num_rawmidis;      /* number of created rawmidi devices */
        struct list_head midi_list;     /* list of midi interfaces */
 
        struct list_head mixer_list;    /* list of mixer interfaces */