11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * Virtual Raw MIDI client on Sequencer
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>,
61da177e4SLinus Torvalds * Jaroslav Kysela <perex@perex.cz>
71da177e4SLinus Torvalds */
81da177e4SLinus Torvalds
91da177e4SLinus Torvalds /*
101da177e4SLinus Torvalds * Virtual Raw MIDI client
111da177e4SLinus Torvalds *
121da177e4SLinus Torvalds * The virtual rawmidi client is a sequencer client which associate
131da177e4SLinus Torvalds * a rawmidi device file. The created rawmidi device file can be
141da177e4SLinus Torvalds * accessed as a normal raw midi, but its MIDI source and destination
151da177e4SLinus Torvalds * are arbitrary. For example, a user-client software synth connected
161da177e4SLinus Torvalds * to this port can be used as a normal midi device as well.
171da177e4SLinus Torvalds *
181da177e4SLinus Torvalds * The virtual rawmidi device accepts also multiple opens. Each file
191da177e4SLinus Torvalds * has its own input buffer, so that no conflict would occur. The drain
201da177e4SLinus Torvalds * of input/output buffer acts only to the local buffer.
211da177e4SLinus Torvalds *
221da177e4SLinus Torvalds */
231da177e4SLinus Torvalds
241da177e4SLinus Torvalds #include <linux/init.h>
251da177e4SLinus Torvalds #include <linux/wait.h>
26da155d5bSPaul Gortmaker #include <linux/module.h>
271da177e4SLinus Torvalds #include <linux/slab.h>
281da177e4SLinus Torvalds #include <sound/core.h>
291da177e4SLinus Torvalds #include <sound/rawmidi.h>
301da177e4SLinus Torvalds #include <sound/info.h>
311da177e4SLinus Torvalds #include <sound/control.h>
321da177e4SLinus Torvalds #include <sound/minors.h>
331da177e4SLinus Torvalds #include <sound/seq_kernel.h>
341da177e4SLinus Torvalds #include <sound/seq_midi_event.h>
351da177e4SLinus Torvalds #include <sound/seq_virmidi.h>
361da177e4SLinus Torvalds
371da177e4SLinus Torvalds MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
381da177e4SLinus Torvalds MODULE_DESCRIPTION("Virtual Raw MIDI client on Sequencer");
391da177e4SLinus Torvalds MODULE_LICENSE("GPL");
401da177e4SLinus Torvalds
411da177e4SLinus Torvalds /*
421da177e4SLinus Torvalds * initialize an event record
431da177e4SLinus Torvalds */
snd_virmidi_init_event(struct snd_virmidi * vmidi,struct snd_seq_event * ev)44c7e0b5bfSTakashi Iwai static void snd_virmidi_init_event(struct snd_virmidi *vmidi,
45c7e0b5bfSTakashi Iwai struct snd_seq_event *ev)
461da177e4SLinus Torvalds {
471da177e4SLinus Torvalds memset(ev, 0, sizeof(*ev));
481da177e4SLinus Torvalds ev->source.port = vmidi->port;
491da177e4SLinus Torvalds switch (vmidi->seq_mode) {
501da177e4SLinus Torvalds case SNDRV_VIRMIDI_SEQ_DISPATCH:
511da177e4SLinus Torvalds ev->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
521da177e4SLinus Torvalds break;
531da177e4SLinus Torvalds case SNDRV_VIRMIDI_SEQ_ATTACH:
541da177e4SLinus Torvalds /* FIXME: source and destination are same - not good.. */
551da177e4SLinus Torvalds ev->dest.client = vmidi->client;
561da177e4SLinus Torvalds ev->dest.port = vmidi->port;
571da177e4SLinus Torvalds break;
581da177e4SLinus Torvalds }
591da177e4SLinus Torvalds ev->type = SNDRV_SEQ_EVENT_NONE;
601da177e4SLinus Torvalds }
611da177e4SLinus Torvalds
621da177e4SLinus Torvalds /*
631da177e4SLinus Torvalds * decode input event and put to read buffer of each opened file
641da177e4SLinus Torvalds */
65*435e7f64STakashi Iwai
66*435e7f64STakashi Iwai /* callback for snd_seq_dump_var_event(), bridging to snd_rawmidi_receive() */
dump_to_rawmidi(void * ptr,void * buf,int count)67*435e7f64STakashi Iwai static int dump_to_rawmidi(void *ptr, void *buf, int count)
68*435e7f64STakashi Iwai {
69*435e7f64STakashi Iwai return snd_rawmidi_receive(ptr, buf, count);
70*435e7f64STakashi Iwai }
71*435e7f64STakashi Iwai
snd_virmidi_dev_receive_event(struct snd_virmidi_dev * rdev,struct snd_seq_event * ev,bool atomic)72c7e0b5bfSTakashi Iwai static int snd_virmidi_dev_receive_event(struct snd_virmidi_dev *rdev,
735803b023STakashi Iwai struct snd_seq_event *ev,
745803b023STakashi Iwai bool atomic)
751da177e4SLinus Torvalds {
76c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi;
771da177e4SLinus Torvalds unsigned char msg[4];
781da177e4SLinus Torvalds int len;
791da177e4SLinus Torvalds
805803b023STakashi Iwai if (atomic)
811da177e4SLinus Torvalds read_lock(&rdev->filelist_lock);
825803b023STakashi Iwai else
835803b023STakashi Iwai down_read(&rdev->filelist_sem);
849244b2c3SJohannes Berg list_for_each_entry(vmidi, &rdev->filelist, list) {
8589b4ab21STakashi Iwai if (!READ_ONCE(vmidi->trigger))
861da177e4SLinus Torvalds continue;
871da177e4SLinus Torvalds if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
881da177e4SLinus Torvalds if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
891da177e4SLinus Torvalds continue;
90*435e7f64STakashi Iwai snd_seq_dump_var_event(ev, dump_to_rawmidi, vmidi->substream);
914384f167STakashi Iwai snd_midi_event_reset_decode(vmidi->parser);
921da177e4SLinus Torvalds } else {
931da177e4SLinus Torvalds len = snd_midi_event_decode(vmidi->parser, msg, sizeof(msg), ev);
941da177e4SLinus Torvalds if (len > 0)
951da177e4SLinus Torvalds snd_rawmidi_receive(vmidi->substream, msg, len);
961da177e4SLinus Torvalds }
971da177e4SLinus Torvalds }
985803b023STakashi Iwai if (atomic)
991da177e4SLinus Torvalds read_unlock(&rdev->filelist_lock);
1005803b023STakashi Iwai else
1015803b023STakashi Iwai up_read(&rdev->filelist_sem);
1021da177e4SLinus Torvalds
1031da177e4SLinus Torvalds return 0;
1041da177e4SLinus Torvalds }
1051da177e4SLinus Torvalds
1061da177e4SLinus Torvalds /*
1071da177e4SLinus Torvalds * event handler of virmidi port
1081da177e4SLinus Torvalds */
snd_virmidi_event_input(struct snd_seq_event * ev,int direct,void * private_data,int atomic,int hop)109c7e0b5bfSTakashi Iwai static int snd_virmidi_event_input(struct snd_seq_event *ev, int direct,
1101da177e4SLinus Torvalds void *private_data, int atomic, int hop)
1111da177e4SLinus Torvalds {
112c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
1131da177e4SLinus Torvalds
1141da177e4SLinus Torvalds rdev = private_data;
1151da177e4SLinus Torvalds if (!(rdev->flags & SNDRV_VIRMIDI_USE))
1161da177e4SLinus Torvalds return 0; /* ignored */
1175803b023STakashi Iwai return snd_virmidi_dev_receive_event(rdev, ev, atomic);
1181da177e4SLinus Torvalds }
1191da177e4SLinus Torvalds
1201da177e4SLinus Torvalds /*
1211da177e4SLinus Torvalds * trigger rawmidi stream for input
1221da177e4SLinus Torvalds */
snd_virmidi_input_trigger(struct snd_rawmidi_substream * substream,int up)123c7e0b5bfSTakashi Iwai static void snd_virmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1241da177e4SLinus Torvalds {
125c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi = substream->runtime->private_data;
1261da177e4SLinus Torvalds
12789b4ab21STakashi Iwai WRITE_ONCE(vmidi->trigger, !!up);
1281da177e4SLinus Torvalds }
1291da177e4SLinus Torvalds
130f7debfe5STakashi Iwai /* process rawmidi bytes and send events;
131f7debfe5STakashi Iwai * we need no lock here for vmidi->event since it's handled only in this work
132f7debfe5STakashi Iwai */
snd_vmidi_output_work(struct work_struct * work)133f7debfe5STakashi Iwai static void snd_vmidi_output_work(struct work_struct *work)
134f7debfe5STakashi Iwai {
135f7debfe5STakashi Iwai struct snd_virmidi *vmidi;
136f7debfe5STakashi Iwai struct snd_rawmidi_substream *substream;
137f7debfe5STakashi Iwai unsigned char input;
138f7debfe5STakashi Iwai int ret;
139f7debfe5STakashi Iwai
140f7debfe5STakashi Iwai vmidi = container_of(work, struct snd_virmidi, output_work);
141f7debfe5STakashi Iwai substream = vmidi->substream;
142f7debfe5STakashi Iwai
143f7debfe5STakashi Iwai /* discard the outputs in dispatch mode unless subscribed */
144f7debfe5STakashi Iwai if (vmidi->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH &&
145f7debfe5STakashi Iwai !(vmidi->rdev->flags & SNDRV_VIRMIDI_SUBSCRIBE)) {
1466aea5702STakashi Iwai snd_rawmidi_proceed(substream);
147f7debfe5STakashi Iwai return;
148f7debfe5STakashi Iwai }
149f7debfe5STakashi Iwai
15089b4ab21STakashi Iwai while (READ_ONCE(vmidi->trigger)) {
151f7debfe5STakashi Iwai if (snd_rawmidi_transmit(substream, &input, 1) != 1)
152f7debfe5STakashi Iwai break;
153ef965ad5STakashi Iwai if (!snd_midi_event_encode_byte(vmidi->parser, input,
154ef965ad5STakashi Iwai &vmidi->event))
155f7debfe5STakashi Iwai continue;
156f7debfe5STakashi Iwai if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) {
157f7debfe5STakashi Iwai ret = snd_seq_kernel_client_dispatch(vmidi->client,
158f7debfe5STakashi Iwai &vmidi->event,
159f7debfe5STakashi Iwai false, 0);
160f7debfe5STakashi Iwai vmidi->event.type = SNDRV_SEQ_EVENT_NONE;
161f7debfe5STakashi Iwai if (ret < 0)
162f7debfe5STakashi Iwai break;
163f7debfe5STakashi Iwai }
164f7debfe5STakashi Iwai /* rawmidi input might be huge, allow to have a break */
165f7debfe5STakashi Iwai cond_resched();
166f7debfe5STakashi Iwai }
167f7debfe5STakashi Iwai }
168f7debfe5STakashi Iwai
1691da177e4SLinus Torvalds /*
1701da177e4SLinus Torvalds * trigger rawmidi stream for output
1711da177e4SLinus Torvalds */
snd_virmidi_output_trigger(struct snd_rawmidi_substream * substream,int up)172c7e0b5bfSTakashi Iwai static void snd_virmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1731da177e4SLinus Torvalds {
174c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi = substream->runtime->private_data;
1751da177e4SLinus Torvalds
17689b4ab21STakashi Iwai WRITE_ONCE(vmidi->trigger, !!up);
177f7debfe5STakashi Iwai if (up)
178f7debfe5STakashi Iwai queue_work(system_highpri_wq, &vmidi->output_work);
1791da177e4SLinus Torvalds }
1801da177e4SLinus Torvalds
1811da177e4SLinus Torvalds /*
1821da177e4SLinus Torvalds * open rawmidi handle for input
1831da177e4SLinus Torvalds */
snd_virmidi_input_open(struct snd_rawmidi_substream * substream)184c7e0b5bfSTakashi Iwai static int snd_virmidi_input_open(struct snd_rawmidi_substream *substream)
1851da177e4SLinus Torvalds {
186c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
187c7e0b5bfSTakashi Iwai struct snd_rawmidi_runtime *runtime = substream->runtime;
188c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi;
1891da177e4SLinus Torvalds
190ecca82b4STakashi Iwai vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL);
1911da177e4SLinus Torvalds if (vmidi == NULL)
1921da177e4SLinus Torvalds return -ENOMEM;
1931da177e4SLinus Torvalds vmidi->substream = substream;
1941da177e4SLinus Torvalds if (snd_midi_event_new(0, &vmidi->parser) < 0) {
1951da177e4SLinus Torvalds kfree(vmidi);
1961da177e4SLinus Torvalds return -ENOMEM;
1971da177e4SLinus Torvalds }
1981da177e4SLinus Torvalds vmidi->seq_mode = rdev->seq_mode;
1991da177e4SLinus Torvalds vmidi->client = rdev->client;
2001da177e4SLinus Torvalds vmidi->port = rdev->port;
2011da177e4SLinus Torvalds runtime->private_data = vmidi;
2025803b023STakashi Iwai down_write(&rdev->filelist_sem);
2035803b023STakashi Iwai write_lock_irq(&rdev->filelist_lock);
2041da177e4SLinus Torvalds list_add_tail(&vmidi->list, &rdev->filelist);
2055803b023STakashi Iwai write_unlock_irq(&rdev->filelist_lock);
2065803b023STakashi Iwai up_write(&rdev->filelist_sem);
2071da177e4SLinus Torvalds vmidi->rdev = rdev;
2081da177e4SLinus Torvalds return 0;
2091da177e4SLinus Torvalds }
2101da177e4SLinus Torvalds
2111da177e4SLinus Torvalds /*
2121da177e4SLinus Torvalds * open rawmidi handle for output
2131da177e4SLinus Torvalds */
snd_virmidi_output_open(struct snd_rawmidi_substream * substream)214c7e0b5bfSTakashi Iwai static int snd_virmidi_output_open(struct snd_rawmidi_substream *substream)
2151da177e4SLinus Torvalds {
216c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
217c7e0b5bfSTakashi Iwai struct snd_rawmidi_runtime *runtime = substream->runtime;
218c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi;
2191da177e4SLinus Torvalds
220ecca82b4STakashi Iwai vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL);
2211da177e4SLinus Torvalds if (vmidi == NULL)
2221da177e4SLinus Torvalds return -ENOMEM;
2231da177e4SLinus Torvalds vmidi->substream = substream;
2241da177e4SLinus Torvalds if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &vmidi->parser) < 0) {
2251da177e4SLinus Torvalds kfree(vmidi);
2261da177e4SLinus Torvalds return -ENOMEM;
2271da177e4SLinus Torvalds }
2281da177e4SLinus Torvalds vmidi->seq_mode = rdev->seq_mode;
2291da177e4SLinus Torvalds vmidi->client = rdev->client;
2301da177e4SLinus Torvalds vmidi->port = rdev->port;
2311da177e4SLinus Torvalds snd_virmidi_init_event(vmidi, &vmidi->event);
2321da177e4SLinus Torvalds vmidi->rdev = rdev;
233f7debfe5STakashi Iwai INIT_WORK(&vmidi->output_work, snd_vmidi_output_work);
2341da177e4SLinus Torvalds runtime->private_data = vmidi;
2351da177e4SLinus Torvalds return 0;
2361da177e4SLinus Torvalds }
2371da177e4SLinus Torvalds
2381da177e4SLinus Torvalds /*
2391da177e4SLinus Torvalds * close rawmidi handle for input
2401da177e4SLinus Torvalds */
snd_virmidi_input_close(struct snd_rawmidi_substream * substream)241c7e0b5bfSTakashi Iwai static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream)
2421da177e4SLinus Torvalds {
2432d1b5c08STakashi Iwai struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
244c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi = substream->runtime->private_data;
2452d1b5c08STakashi Iwai
2465803b023STakashi Iwai down_write(&rdev->filelist_sem);
2472d1b5c08STakashi Iwai write_lock_irq(&rdev->filelist_lock);
2481da177e4SLinus Torvalds list_del(&vmidi->list);
2492d1b5c08STakashi Iwai write_unlock_irq(&rdev->filelist_lock);
2505803b023STakashi Iwai up_write(&rdev->filelist_sem);
2512d1b5c08STakashi Iwai snd_midi_event_free(vmidi->parser);
2521da177e4SLinus Torvalds substream->runtime->private_data = NULL;
2531da177e4SLinus Torvalds kfree(vmidi);
2541da177e4SLinus Torvalds return 0;
2551da177e4SLinus Torvalds }
2561da177e4SLinus Torvalds
2571da177e4SLinus Torvalds /*
2581da177e4SLinus Torvalds * close rawmidi handle for output
2591da177e4SLinus Torvalds */
snd_virmidi_output_close(struct snd_rawmidi_substream * substream)260c7e0b5bfSTakashi Iwai static int snd_virmidi_output_close(struct snd_rawmidi_substream *substream)
2611da177e4SLinus Torvalds {
262c7e0b5bfSTakashi Iwai struct snd_virmidi *vmidi = substream->runtime->private_data;
263f7debfe5STakashi Iwai
26489b4ab21STakashi Iwai WRITE_ONCE(vmidi->trigger, false); /* to be sure */
265f7debfe5STakashi Iwai cancel_work_sync(&vmidi->output_work);
2661da177e4SLinus Torvalds snd_midi_event_free(vmidi->parser);
2671da177e4SLinus Torvalds substream->runtime->private_data = NULL;
2681da177e4SLinus Torvalds kfree(vmidi);
2691da177e4SLinus Torvalds return 0;
2701da177e4SLinus Torvalds }
2711da177e4SLinus Torvalds
2721da177e4SLinus Torvalds /*
2737560ee03SStefan Sauer * drain output work queue
2747560ee03SStefan Sauer */
snd_virmidi_output_drain(struct snd_rawmidi_substream * substream)2757560ee03SStefan Sauer static void snd_virmidi_output_drain(struct snd_rawmidi_substream *substream)
2767560ee03SStefan Sauer {
2777560ee03SStefan Sauer struct snd_virmidi *vmidi = substream->runtime->private_data;
2787560ee03SStefan Sauer
2797560ee03SStefan Sauer flush_work(&vmidi->output_work);
2807560ee03SStefan Sauer }
2817560ee03SStefan Sauer
2827560ee03SStefan Sauer /*
2831da177e4SLinus Torvalds * subscribe callback - allow output to rawmidi device
2841da177e4SLinus Torvalds */
snd_virmidi_subscribe(void * private_data,struct snd_seq_port_subscribe * info)285c7e0b5bfSTakashi Iwai static int snd_virmidi_subscribe(void *private_data,
286c7e0b5bfSTakashi Iwai struct snd_seq_port_subscribe *info)
2871da177e4SLinus Torvalds {
288c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
2891da177e4SLinus Torvalds
2901da177e4SLinus Torvalds rdev = private_data;
2911da177e4SLinus Torvalds if (!try_module_get(rdev->card->module))
2921da177e4SLinus Torvalds return -EFAULT;
2931da177e4SLinus Torvalds rdev->flags |= SNDRV_VIRMIDI_SUBSCRIBE;
2941da177e4SLinus Torvalds return 0;
2951da177e4SLinus Torvalds }
2961da177e4SLinus Torvalds
2971da177e4SLinus Torvalds /*
2981da177e4SLinus Torvalds * unsubscribe callback - disallow output to rawmidi device
2991da177e4SLinus Torvalds */
snd_virmidi_unsubscribe(void * private_data,struct snd_seq_port_subscribe * info)300c7e0b5bfSTakashi Iwai static int snd_virmidi_unsubscribe(void *private_data,
301c7e0b5bfSTakashi Iwai struct snd_seq_port_subscribe *info)
3021da177e4SLinus Torvalds {
303c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
3041da177e4SLinus Torvalds
3051da177e4SLinus Torvalds rdev = private_data;
3061da177e4SLinus Torvalds rdev->flags &= ~SNDRV_VIRMIDI_SUBSCRIBE;
3071da177e4SLinus Torvalds module_put(rdev->card->module);
3081da177e4SLinus Torvalds return 0;
3091da177e4SLinus Torvalds }
3101da177e4SLinus Torvalds
3111da177e4SLinus Torvalds
3121da177e4SLinus Torvalds /*
3131da177e4SLinus Torvalds * use callback - allow input to rawmidi device
3141da177e4SLinus Torvalds */
snd_virmidi_use(void * private_data,struct snd_seq_port_subscribe * info)315c7e0b5bfSTakashi Iwai static int snd_virmidi_use(void *private_data,
316c7e0b5bfSTakashi Iwai struct snd_seq_port_subscribe *info)
3171da177e4SLinus Torvalds {
318c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
3191da177e4SLinus Torvalds
3201da177e4SLinus Torvalds rdev = private_data;
3211da177e4SLinus Torvalds if (!try_module_get(rdev->card->module))
3221da177e4SLinus Torvalds return -EFAULT;
3231da177e4SLinus Torvalds rdev->flags |= SNDRV_VIRMIDI_USE;
3241da177e4SLinus Torvalds return 0;
3251da177e4SLinus Torvalds }
3261da177e4SLinus Torvalds
3271da177e4SLinus Torvalds /*
3281da177e4SLinus Torvalds * unuse callback - disallow input to rawmidi device
3291da177e4SLinus Torvalds */
snd_virmidi_unuse(void * private_data,struct snd_seq_port_subscribe * info)330c7e0b5bfSTakashi Iwai static int snd_virmidi_unuse(void *private_data,
331c7e0b5bfSTakashi Iwai struct snd_seq_port_subscribe *info)
3321da177e4SLinus Torvalds {
333c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
3341da177e4SLinus Torvalds
3351da177e4SLinus Torvalds rdev = private_data;
3361da177e4SLinus Torvalds rdev->flags &= ~SNDRV_VIRMIDI_USE;
3371da177e4SLinus Torvalds module_put(rdev->card->module);
3381da177e4SLinus Torvalds return 0;
3391da177e4SLinus Torvalds }
3401da177e4SLinus Torvalds
3411da177e4SLinus Torvalds
3421da177e4SLinus Torvalds /*
3431da177e4SLinus Torvalds * Register functions
3441da177e4SLinus Torvalds */
3451da177e4SLinus Torvalds
346c62a5700STakashi Iwai static const struct snd_rawmidi_ops snd_virmidi_input_ops = {
3471da177e4SLinus Torvalds .open = snd_virmidi_input_open,
3481da177e4SLinus Torvalds .close = snd_virmidi_input_close,
3491da177e4SLinus Torvalds .trigger = snd_virmidi_input_trigger,
3501da177e4SLinus Torvalds };
3511da177e4SLinus Torvalds
352c62a5700STakashi Iwai static const struct snd_rawmidi_ops snd_virmidi_output_ops = {
3531da177e4SLinus Torvalds .open = snd_virmidi_output_open,
3541da177e4SLinus Torvalds .close = snd_virmidi_output_close,
3551da177e4SLinus Torvalds .trigger = snd_virmidi_output_trigger,
3567560ee03SStefan Sauer .drain = snd_virmidi_output_drain,
3571da177e4SLinus Torvalds };
3581da177e4SLinus Torvalds
3591da177e4SLinus Torvalds /*
3601da177e4SLinus Torvalds * create a sequencer client and a port
3611da177e4SLinus Torvalds */
snd_virmidi_dev_attach_seq(struct snd_virmidi_dev * rdev)362c7e0b5bfSTakashi Iwai static int snd_virmidi_dev_attach_seq(struct snd_virmidi_dev *rdev)
3631da177e4SLinus Torvalds {
3641da177e4SLinus Torvalds int client;
365c7e0b5bfSTakashi Iwai struct snd_seq_port_callback pcallbacks;
366c7e0b5bfSTakashi Iwai struct snd_seq_port_info *pinfo;
3671da177e4SLinus Torvalds int err;
3681da177e4SLinus Torvalds
3691da177e4SLinus Torvalds if (rdev->client >= 0)
3701da177e4SLinus Torvalds return 0;
3711da177e4SLinus Torvalds
372dd00cc48SYoann Padioleau pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
3737b6d9245SClemens Ladisch if (!pinfo) {
3741da177e4SLinus Torvalds err = -ENOMEM;
3751da177e4SLinus Torvalds goto __error;
3761da177e4SLinus Torvalds }
3771da177e4SLinus Torvalds
3787b6d9245SClemens Ladisch client = snd_seq_create_kernel_client(rdev->card, rdev->device,
3797b6d9245SClemens Ladisch "%s %d-%d", rdev->rmidi->name,
3807b6d9245SClemens Ladisch rdev->card->number,
3817b6d9245SClemens Ladisch rdev->device);
3821da177e4SLinus Torvalds if (client < 0) {
3831da177e4SLinus Torvalds err = client;
3841da177e4SLinus Torvalds goto __error;
3851da177e4SLinus Torvalds }
3861da177e4SLinus Torvalds rdev->client = client;
3871da177e4SLinus Torvalds
3881da177e4SLinus Torvalds /* create a port */
3891da177e4SLinus Torvalds pinfo->addr.client = client;
3901da177e4SLinus Torvalds sprintf(pinfo->name, "VirMIDI %d-%d", rdev->card->number, rdev->device);
3911da177e4SLinus Torvalds /* set all capabilities */
3921da177e4SLinus Torvalds pinfo->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
3931da177e4SLinus Torvalds pinfo->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
3941da177e4SLinus Torvalds pinfo->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
395ff166a9dSTakashi Iwai pinfo->direction = SNDRV_SEQ_PORT_DIR_BIDIRECTION;
396450047a7SClemens Ladisch pinfo->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
397450047a7SClemens Ladisch | SNDRV_SEQ_PORT_TYPE_SOFTWARE
398450047a7SClemens Ladisch | SNDRV_SEQ_PORT_TYPE_PORT;
3991da177e4SLinus Torvalds pinfo->midi_channels = 16;
4001da177e4SLinus Torvalds memset(&pcallbacks, 0, sizeof(pcallbacks));
4011da177e4SLinus Torvalds pcallbacks.owner = THIS_MODULE;
4021da177e4SLinus Torvalds pcallbacks.private_data = rdev;
4031da177e4SLinus Torvalds pcallbacks.subscribe = snd_virmidi_subscribe;
4041da177e4SLinus Torvalds pcallbacks.unsubscribe = snd_virmidi_unsubscribe;
4051da177e4SLinus Torvalds pcallbacks.use = snd_virmidi_use;
4061da177e4SLinus Torvalds pcallbacks.unuse = snd_virmidi_unuse;
4071da177e4SLinus Torvalds pcallbacks.event_input = snd_virmidi_event_input;
4081da177e4SLinus Torvalds pinfo->kernel = &pcallbacks;
4090aa0d387SClemens Ladisch err = snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, pinfo);
4101da177e4SLinus Torvalds if (err < 0) {
4111da177e4SLinus Torvalds snd_seq_delete_kernel_client(client);
4121da177e4SLinus Torvalds rdev->client = -1;
4131da177e4SLinus Torvalds goto __error;
4141da177e4SLinus Torvalds }
4151da177e4SLinus Torvalds
4161da177e4SLinus Torvalds rdev->port = pinfo->addr.port;
4171da177e4SLinus Torvalds err = 0; /* success */
4181da177e4SLinus Torvalds
4191da177e4SLinus Torvalds __error:
4201da177e4SLinus Torvalds kfree(pinfo);
4211da177e4SLinus Torvalds return err;
4221da177e4SLinus Torvalds }
4231da177e4SLinus Torvalds
4241da177e4SLinus Torvalds
4251da177e4SLinus Torvalds /*
4261da177e4SLinus Torvalds * release the sequencer client
4271da177e4SLinus Torvalds */
snd_virmidi_dev_detach_seq(struct snd_virmidi_dev * rdev)428c7e0b5bfSTakashi Iwai static void snd_virmidi_dev_detach_seq(struct snd_virmidi_dev *rdev)
4291da177e4SLinus Torvalds {
4301da177e4SLinus Torvalds if (rdev->client >= 0) {
4311da177e4SLinus Torvalds snd_seq_delete_kernel_client(rdev->client);
4321da177e4SLinus Torvalds rdev->client = -1;
4331da177e4SLinus Torvalds }
4341da177e4SLinus Torvalds }
4351da177e4SLinus Torvalds
4361da177e4SLinus Torvalds /*
4371da177e4SLinus Torvalds * register the device
4381da177e4SLinus Torvalds */
snd_virmidi_dev_register(struct snd_rawmidi * rmidi)439c7e0b5bfSTakashi Iwai static int snd_virmidi_dev_register(struct snd_rawmidi *rmidi)
4401da177e4SLinus Torvalds {
441c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev = rmidi->private_data;
4421da177e4SLinus Torvalds int err;
4431da177e4SLinus Torvalds
4441da177e4SLinus Torvalds switch (rdev->seq_mode) {
4451da177e4SLinus Torvalds case SNDRV_VIRMIDI_SEQ_DISPATCH:
4461da177e4SLinus Torvalds err = snd_virmidi_dev_attach_seq(rdev);
4471da177e4SLinus Torvalds if (err < 0)
4481da177e4SLinus Torvalds return err;
4491da177e4SLinus Torvalds break;
4501da177e4SLinus Torvalds case SNDRV_VIRMIDI_SEQ_ATTACH:
4511da177e4SLinus Torvalds if (rdev->client == 0)
4521da177e4SLinus Torvalds return -EINVAL;
4531da177e4SLinus Torvalds /* should check presence of port more strictly.. */
4541da177e4SLinus Torvalds break;
4551da177e4SLinus Torvalds default:
45604cc79a0STakashi Iwai pr_err("ALSA: seq_virmidi: seq_mode is not set: %d\n", rdev->seq_mode);
4571da177e4SLinus Torvalds return -EINVAL;
4581da177e4SLinus Torvalds }
4591da177e4SLinus Torvalds return 0;
4601da177e4SLinus Torvalds }
4611da177e4SLinus Torvalds
4621da177e4SLinus Torvalds
4631da177e4SLinus Torvalds /*
4641da177e4SLinus Torvalds * unregister the device
4651da177e4SLinus Torvalds */
snd_virmidi_dev_unregister(struct snd_rawmidi * rmidi)466c7e0b5bfSTakashi Iwai static int snd_virmidi_dev_unregister(struct snd_rawmidi *rmidi)
4671da177e4SLinus Torvalds {
468c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev = rmidi->private_data;
4691da177e4SLinus Torvalds
4701da177e4SLinus Torvalds if (rdev->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH)
4711da177e4SLinus Torvalds snd_virmidi_dev_detach_seq(rdev);
4721da177e4SLinus Torvalds return 0;
4731da177e4SLinus Torvalds }
4741da177e4SLinus Torvalds
4751da177e4SLinus Torvalds /*
4761da177e4SLinus Torvalds *
4771da177e4SLinus Torvalds */
478efdbe3c3SJulia Lawall static const struct snd_rawmidi_global_ops snd_virmidi_global_ops = {
4791da177e4SLinus Torvalds .dev_register = snd_virmidi_dev_register,
4801da177e4SLinus Torvalds .dev_unregister = snd_virmidi_dev_unregister,
4811da177e4SLinus Torvalds };
4821da177e4SLinus Torvalds
4831da177e4SLinus Torvalds /*
4841da177e4SLinus Torvalds * free device
4851da177e4SLinus Torvalds */
snd_virmidi_free(struct snd_rawmidi * rmidi)486c7e0b5bfSTakashi Iwai static void snd_virmidi_free(struct snd_rawmidi *rmidi)
4871da177e4SLinus Torvalds {
488c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev = rmidi->private_data;
4891da177e4SLinus Torvalds kfree(rdev);
4901da177e4SLinus Torvalds }
4911da177e4SLinus Torvalds
4921da177e4SLinus Torvalds /*
4931da177e4SLinus Torvalds * create a new device
4941da177e4SLinus Torvalds *
4951da177e4SLinus Torvalds */
4961da177e4SLinus Torvalds /* exported */
snd_virmidi_new(struct snd_card * card,int device,struct snd_rawmidi ** rrmidi)497c7e0b5bfSTakashi Iwai int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi)
4981da177e4SLinus Torvalds {
499c7e0b5bfSTakashi Iwai struct snd_rawmidi *rmidi;
500c7e0b5bfSTakashi Iwai struct snd_virmidi_dev *rdev;
5011da177e4SLinus Torvalds int err;
5021da177e4SLinus Torvalds
5031da177e4SLinus Torvalds *rrmidi = NULL;
504f9a6bb84STakashi Iwai err = snd_rawmidi_new(card, "VirMidi", device,
5051da177e4SLinus Torvalds 16, /* may be configurable */
5061da177e4SLinus Torvalds 16, /* may be configurable */
507f9a6bb84STakashi Iwai &rmidi);
508f9a6bb84STakashi Iwai if (err < 0)
5091da177e4SLinus Torvalds return err;
5101da177e4SLinus Torvalds strcpy(rmidi->name, rmidi->id);
511ecca82b4STakashi Iwai rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
5121da177e4SLinus Torvalds if (rdev == NULL) {
5131da177e4SLinus Torvalds snd_device_free(card, rmidi);
5141da177e4SLinus Torvalds return -ENOMEM;
5151da177e4SLinus Torvalds }
5161da177e4SLinus Torvalds rdev->card = card;
5171da177e4SLinus Torvalds rdev->rmidi = rmidi;
5181da177e4SLinus Torvalds rdev->device = device;
5191da177e4SLinus Torvalds rdev->client = -1;
5205803b023STakashi Iwai init_rwsem(&rdev->filelist_sem);
5211da177e4SLinus Torvalds rwlock_init(&rdev->filelist_lock);
5221da177e4SLinus Torvalds INIT_LIST_HEAD(&rdev->filelist);
5231da177e4SLinus Torvalds rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH;
5241da177e4SLinus Torvalds rmidi->private_data = rdev;
5251da177e4SLinus Torvalds rmidi->private_free = snd_virmidi_free;
5261da177e4SLinus Torvalds rmidi->ops = &snd_virmidi_global_ops;
5271da177e4SLinus Torvalds snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_virmidi_input_ops);
5281da177e4SLinus Torvalds snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_virmidi_output_ops);
5291da177e4SLinus Torvalds rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT |
5301da177e4SLinus Torvalds SNDRV_RAWMIDI_INFO_OUTPUT |
5311da177e4SLinus Torvalds SNDRV_RAWMIDI_INFO_DUPLEX;
5321da177e4SLinus Torvalds *rrmidi = rmidi;
5331da177e4SLinus Torvalds return 0;
5341da177e4SLinus Torvalds }
5359c8ddd10STakashi Iwai EXPORT_SYMBOL(snd_virmidi_new);
536