1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Abstract layer for MIDI v1.0 stream
4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5  */
6 
7 #include <sound/core.h>
8 #include <linux/major.h>
9 #include <linux/init.h>
10 #include <linux/sched/signal.h>
11 #include <linux/slab.h>
12 #include <linux/time.h>
13 #include <linux/wait.h>
14 #include <linux/mutex.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/mm.h>
18 #include <linux/nospec.h>
19 #include <sound/rawmidi.h>
20 #include <sound/info.h>
21 #include <sound/control.h>
22 #include <sound/minors.h>
23 #include <sound/initval.h>
24 
25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
27 MODULE_LICENSE("GPL");
28 
29 #ifdef CONFIG_SND_OSSEMUL
30 static int midi_map[SNDRV_CARDS];
31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
32 module_param_array(midi_map, int, NULL, 0444);
33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
34 module_param_array(amidi_map, int, NULL, 0444);
35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
36 #endif /* CONFIG_SND_OSSEMUL */
37 
38 static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
39 static int snd_rawmidi_dev_free(struct snd_device *device);
40 static int snd_rawmidi_dev_register(struct snd_device *device);
41 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
42 
43 static LIST_HEAD(snd_rawmidi_devices);
44 static DEFINE_MUTEX(register_mutex);
45 
46 #define rmidi_err(rmidi, fmt, args...) \
47 	dev_err(&(rmidi)->dev, fmt, ##args)
48 #define rmidi_warn(rmidi, fmt, args...) \
49 	dev_warn(&(rmidi)->dev, fmt, ##args)
50 #define rmidi_dbg(rmidi, fmt, args...) \
51 	dev_dbg(&(rmidi)->dev, fmt, ##args)
52 
53 struct snd_rawmidi_status32 {
54 	s32 stream;
55 	s32 tstamp_sec;			/* Timestamp */
56 	s32 tstamp_nsec;
57 	u32 avail;			/* available bytes */
58 	u32 xruns;			/* count of overruns since last status (in bytes) */
59 	unsigned char reserved[16];	/* reserved for future use */
60 };
61 
62 #define SNDRV_RAWMIDI_IOCTL_STATUS32	_IOWR('W', 0x20, struct snd_rawmidi_status32)
63 
64 struct snd_rawmidi_status64 {
65 	int stream;
66 	u8 rsvd[4];			/* alignment */
67 	s64 tstamp_sec;			/* Timestamp */
68 	s64 tstamp_nsec;
69 	size_t avail;			/* available bytes */
70 	size_t xruns;			/* count of overruns since last status (in bytes) */
71 	unsigned char reserved[16];	/* reserved for future use */
72 };
73 
74 #define SNDRV_RAWMIDI_IOCTL_STATUS64	_IOWR('W', 0x20, struct snd_rawmidi_status64)
75 
snd_rawmidi_search(struct snd_card * card,int device)76 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
77 {
78 	struct snd_rawmidi *rawmidi;
79 
80 	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
81 		if (rawmidi->card == card && rawmidi->device == device)
82 			return rawmidi;
83 	return NULL;
84 }
85 
snd_rawmidi_file_flags(struct file * file)86 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
87 {
88 	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
89 	case FMODE_WRITE:
90 		return SNDRV_RAWMIDI_LFLG_OUTPUT;
91 	case FMODE_READ:
92 		return SNDRV_RAWMIDI_LFLG_INPUT;
93 	default:
94 		return SNDRV_RAWMIDI_LFLG_OPEN;
95 	}
96 }
97 
__snd_rawmidi_ready(struct snd_rawmidi_runtime * runtime)98 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
99 {
100 	return runtime->avail >= runtime->avail_min;
101 }
102 
snd_rawmidi_ready(struct snd_rawmidi_substream * substream)103 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
104 {
105 	unsigned long flags;
106 	bool ready;
107 
108 	spin_lock_irqsave(&substream->lock, flags);
109 	ready = __snd_rawmidi_ready(substream->runtime);
110 	spin_unlock_irqrestore(&substream->lock, flags);
111 	return ready;
112 }
113 
snd_rawmidi_ready_append(struct snd_rawmidi_substream * substream,size_t count)114 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
115 					   size_t count)
116 {
117 	struct snd_rawmidi_runtime *runtime = substream->runtime;
118 
119 	return runtime->avail >= runtime->avail_min &&
120 	       (!substream->append || runtime->avail >= count);
121 }
122 
snd_rawmidi_input_event_work(struct work_struct * work)123 static void snd_rawmidi_input_event_work(struct work_struct *work)
124 {
125 	struct snd_rawmidi_runtime *runtime =
126 		container_of(work, struct snd_rawmidi_runtime, event_work);
127 
128 	if (runtime->event)
129 		runtime->event(runtime->substream);
130 }
131 
132 /* buffer refcount management: call with substream->lock held */
snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime * runtime)133 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
134 {
135 	runtime->buffer_ref++;
136 }
137 
snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime * runtime)138 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
139 {
140 	runtime->buffer_ref--;
141 }
142 
snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream * substream)143 static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
144 {
145 	int loop = HZ;
146 
147 	spin_lock_irq(&substream->lock);
148 	while (substream->runtime->buffer_ref) {
149 		spin_unlock_irq(&substream->lock);
150 		if (!--loop) {
151 			rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
152 			return;
153 		}
154 		schedule_timeout_uninterruptible(1);
155 		spin_lock_irq(&substream->lock);
156 	}
157 	spin_unlock_irq(&substream->lock);
158 }
159 
snd_rawmidi_runtime_create(struct snd_rawmidi_substream * substream)160 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
161 {
162 	struct snd_rawmidi_runtime *runtime;
163 
164 	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
165 	if (!runtime)
166 		return -ENOMEM;
167 	runtime->substream = substream;
168 	init_waitqueue_head(&runtime->sleep);
169 	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
170 	runtime->event = NULL;
171 	runtime->buffer_size = PAGE_SIZE;
172 	runtime->avail_min = 1;
173 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
174 		runtime->avail = 0;
175 	else
176 		runtime->avail = runtime->buffer_size;
177 	runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
178 	if (!runtime->buffer) {
179 		kfree(runtime);
180 		return -ENOMEM;
181 	}
182 	runtime->appl_ptr = runtime->hw_ptr = 0;
183 	substream->runtime = runtime;
184 	return 0;
185 }
186 
snd_rawmidi_runtime_free(struct snd_rawmidi_substream * substream)187 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
188 {
189 	struct snd_rawmidi_runtime *runtime = substream->runtime;
190 
191 	kvfree(runtime->buffer);
192 	kfree(runtime);
193 	substream->runtime = NULL;
194 	return 0;
195 }
196 
snd_rawmidi_output_trigger(struct snd_rawmidi_substream * substream,int up)197 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
198 {
199 	if (!substream->opened)
200 		return;
201 	substream->ops->trigger(substream, up);
202 }
203 
snd_rawmidi_input_trigger(struct snd_rawmidi_substream * substream,int up)204 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
205 {
206 	if (!substream->opened)
207 		return;
208 	substream->ops->trigger(substream, up);
209 	if (!up)
210 		cancel_work_sync(&substream->runtime->event_work);
211 }
212 
__reset_runtime_ptrs(struct snd_rawmidi_runtime * runtime,bool is_input)213 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
214 				 bool is_input)
215 {
216 	runtime->drain = 0;
217 	runtime->appl_ptr = runtime->hw_ptr = 0;
218 	runtime->avail = is_input ? 0 : runtime->buffer_size;
219 }
220 
reset_runtime_ptrs(struct snd_rawmidi_substream * substream,bool is_input)221 static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
222 			       bool is_input)
223 {
224 	unsigned long flags;
225 
226 	spin_lock_irqsave(&substream->lock, flags);
227 	if (substream->opened && substream->runtime)
228 		__reset_runtime_ptrs(substream->runtime, is_input);
229 	spin_unlock_irqrestore(&substream->lock, flags);
230 }
231 
snd_rawmidi_drop_output(struct snd_rawmidi_substream * substream)232 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
233 {
234 	snd_rawmidi_output_trigger(substream, 0);
235 	reset_runtime_ptrs(substream, false);
236 	return 0;
237 }
238 EXPORT_SYMBOL(snd_rawmidi_drop_output);
239 
snd_rawmidi_drain_output(struct snd_rawmidi_substream * substream)240 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
241 {
242 	int err = 0;
243 	long timeout;
244 	struct snd_rawmidi_runtime *runtime;
245 
246 	spin_lock_irq(&substream->lock);
247 	runtime = substream->runtime;
248 	if (!substream->opened || !runtime || !runtime->buffer) {
249 		err = -EINVAL;
250 	} else {
251 		snd_rawmidi_buffer_ref(runtime);
252 		runtime->drain = 1;
253 	}
254 	spin_unlock_irq(&substream->lock);
255 	if (err < 0)
256 		return err;
257 
258 	timeout = wait_event_interruptible_timeout(runtime->sleep,
259 				(runtime->avail >= runtime->buffer_size),
260 				10*HZ);
261 
262 	spin_lock_irq(&substream->lock);
263 	if (signal_pending(current))
264 		err = -ERESTARTSYS;
265 	if (runtime->avail < runtime->buffer_size && !timeout) {
266 		rmidi_warn(substream->rmidi,
267 			   "rawmidi drain error (avail = %li, buffer_size = %li)\n",
268 			   (long)runtime->avail, (long)runtime->buffer_size);
269 		err = -EIO;
270 	}
271 	runtime->drain = 0;
272 	spin_unlock_irq(&substream->lock);
273 
274 	if (err != -ERESTARTSYS) {
275 		/* we need wait a while to make sure that Tx FIFOs are empty */
276 		if (substream->ops->drain)
277 			substream->ops->drain(substream);
278 		else
279 			msleep(50);
280 		snd_rawmidi_drop_output(substream);
281 	}
282 
283 	spin_lock_irq(&substream->lock);
284 	snd_rawmidi_buffer_unref(runtime);
285 	spin_unlock_irq(&substream->lock);
286 
287 	return err;
288 }
289 EXPORT_SYMBOL(snd_rawmidi_drain_output);
290 
snd_rawmidi_drain_input(struct snd_rawmidi_substream * substream)291 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
292 {
293 	snd_rawmidi_input_trigger(substream, 0);
294 	reset_runtime_ptrs(substream, true);
295 	return 0;
296 }
297 EXPORT_SYMBOL(snd_rawmidi_drain_input);
298 
299 /* look for an available substream for the given stream direction;
300  * if a specific subdevice is given, try to assign it
301  */
assign_substream(struct snd_rawmidi * rmidi,int subdevice,int stream,int mode,struct snd_rawmidi_substream ** sub_ret)302 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
303 			    int stream, int mode,
304 			    struct snd_rawmidi_substream **sub_ret)
305 {
306 	struct snd_rawmidi_substream *substream;
307 	struct snd_rawmidi_str *s = &rmidi->streams[stream];
308 	static const unsigned int info_flags[2] = {
309 		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
310 		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
311 	};
312 
313 	if (!(rmidi->info_flags & info_flags[stream]))
314 		return -ENXIO;
315 	if (subdevice >= 0 && subdevice >= s->substream_count)
316 		return -ENODEV;
317 
318 	list_for_each_entry(substream, &s->substreams, list) {
319 		if (substream->opened) {
320 			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
321 			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
322 			    !substream->append)
323 				continue;
324 		}
325 		if (subdevice < 0 || subdevice == substream->number) {
326 			*sub_ret = substream;
327 			return 0;
328 		}
329 	}
330 	return -EAGAIN;
331 }
332 
333 /* open and do ref-counting for the given substream */
open_substream(struct snd_rawmidi * rmidi,struct snd_rawmidi_substream * substream,int mode)334 static int open_substream(struct snd_rawmidi *rmidi,
335 			  struct snd_rawmidi_substream *substream,
336 			  int mode)
337 {
338 	int err;
339 
340 	if (substream->use_count == 0) {
341 		err = snd_rawmidi_runtime_create(substream);
342 		if (err < 0)
343 			return err;
344 		err = substream->ops->open(substream);
345 		if (err < 0) {
346 			snd_rawmidi_runtime_free(substream);
347 			return err;
348 		}
349 		spin_lock_irq(&substream->lock);
350 		substream->opened = 1;
351 		substream->active_sensing = 0;
352 		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
353 			substream->append = 1;
354 		substream->pid = get_pid(task_pid(current));
355 		rmidi->streams[substream->stream].substream_opened++;
356 		spin_unlock_irq(&substream->lock);
357 	}
358 	substream->use_count++;
359 	return 0;
360 }
361 
362 static void close_substream(struct snd_rawmidi *rmidi,
363 			    struct snd_rawmidi_substream *substream,
364 			    int cleanup);
365 
rawmidi_open_priv(struct snd_rawmidi * rmidi,int subdevice,int mode,struct snd_rawmidi_file * rfile)366 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
367 			     struct snd_rawmidi_file *rfile)
368 {
369 	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
370 	int err;
371 
372 	rfile->input = rfile->output = NULL;
373 	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
374 		err = assign_substream(rmidi, subdevice,
375 				       SNDRV_RAWMIDI_STREAM_INPUT,
376 				       mode, &sinput);
377 		if (err < 0)
378 			return err;
379 	}
380 	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
381 		err = assign_substream(rmidi, subdevice,
382 				       SNDRV_RAWMIDI_STREAM_OUTPUT,
383 				       mode, &soutput);
384 		if (err < 0)
385 			return err;
386 	}
387 
388 	if (sinput) {
389 		err = open_substream(rmidi, sinput, mode);
390 		if (err < 0)
391 			return err;
392 	}
393 	if (soutput) {
394 		err = open_substream(rmidi, soutput, mode);
395 		if (err < 0) {
396 			if (sinput)
397 				close_substream(rmidi, sinput, 0);
398 			return err;
399 		}
400 	}
401 
402 	rfile->rmidi = rmidi;
403 	rfile->input = sinput;
404 	rfile->output = soutput;
405 	return 0;
406 }
407 
408 /* called from sound/core/seq/seq_midi.c */
snd_rawmidi_kernel_open(struct snd_card * card,int device,int subdevice,int mode,struct snd_rawmidi_file * rfile)409 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
410 			    int mode, struct snd_rawmidi_file *rfile)
411 {
412 	struct snd_rawmidi *rmidi;
413 	int err = 0;
414 
415 	if (snd_BUG_ON(!rfile))
416 		return -EINVAL;
417 
418 	mutex_lock(&register_mutex);
419 	rmidi = snd_rawmidi_search(card, device);
420 	if (!rmidi)
421 		err = -ENODEV;
422 	else if (!try_module_get(rmidi->card->module))
423 		err = -ENXIO;
424 	mutex_unlock(&register_mutex);
425 	if (err < 0)
426 		return err;
427 
428 	mutex_lock(&rmidi->open_mutex);
429 	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
430 	mutex_unlock(&rmidi->open_mutex);
431 	if (err < 0)
432 		module_put(rmidi->card->module);
433 	return err;
434 }
435 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
436 
snd_rawmidi_open(struct inode * inode,struct file * file)437 static int snd_rawmidi_open(struct inode *inode, struct file *file)
438 {
439 	int maj = imajor(inode);
440 	struct snd_card *card;
441 	int subdevice;
442 	unsigned short fflags;
443 	int err;
444 	struct snd_rawmidi *rmidi;
445 	struct snd_rawmidi_file *rawmidi_file = NULL;
446 	wait_queue_entry_t wait;
447 
448 	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
449 		return -EINVAL;		/* invalid combination */
450 
451 	err = stream_open(inode, file);
452 	if (err < 0)
453 		return err;
454 
455 	if (maj == snd_major) {
456 		rmidi = snd_lookup_minor_data(iminor(inode),
457 					      SNDRV_DEVICE_TYPE_RAWMIDI);
458 #ifdef CONFIG_SND_OSSEMUL
459 	} else if (maj == SOUND_MAJOR) {
460 		rmidi = snd_lookup_oss_minor_data(iminor(inode),
461 						  SNDRV_OSS_DEVICE_TYPE_MIDI);
462 #endif
463 	} else
464 		return -ENXIO;
465 
466 	if (rmidi == NULL)
467 		return -ENODEV;
468 
469 	if (!try_module_get(rmidi->card->module)) {
470 		snd_card_unref(rmidi->card);
471 		return -ENXIO;
472 	}
473 
474 	mutex_lock(&rmidi->open_mutex);
475 	card = rmidi->card;
476 	err = snd_card_file_add(card, file);
477 	if (err < 0)
478 		goto __error_card;
479 	fflags = snd_rawmidi_file_flags(file);
480 	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
481 		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
482 	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
483 	if (rawmidi_file == NULL) {
484 		err = -ENOMEM;
485 		goto __error;
486 	}
487 	rawmidi_file->user_pversion = 0;
488 	init_waitqueue_entry(&wait, current);
489 	add_wait_queue(&rmidi->open_wait, &wait);
490 	while (1) {
491 		subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
492 		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
493 		if (err >= 0)
494 			break;
495 		if (err == -EAGAIN) {
496 			if (file->f_flags & O_NONBLOCK) {
497 				err = -EBUSY;
498 				break;
499 			}
500 		} else
501 			break;
502 		set_current_state(TASK_INTERRUPTIBLE);
503 		mutex_unlock(&rmidi->open_mutex);
504 		schedule();
505 		mutex_lock(&rmidi->open_mutex);
506 		if (rmidi->card->shutdown) {
507 			err = -ENODEV;
508 			break;
509 		}
510 		if (signal_pending(current)) {
511 			err = -ERESTARTSYS;
512 			break;
513 		}
514 	}
515 	remove_wait_queue(&rmidi->open_wait, &wait);
516 	if (err < 0) {
517 		kfree(rawmidi_file);
518 		goto __error;
519 	}
520 #ifdef CONFIG_SND_OSSEMUL
521 	if (rawmidi_file->input && rawmidi_file->input->runtime)
522 		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
523 	if (rawmidi_file->output && rawmidi_file->output->runtime)
524 		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
525 #endif
526 	file->private_data = rawmidi_file;
527 	mutex_unlock(&rmidi->open_mutex);
528 	snd_card_unref(rmidi->card);
529 	return 0;
530 
531  __error:
532 	snd_card_file_remove(card, file);
533  __error_card:
534 	mutex_unlock(&rmidi->open_mutex);
535 	module_put(rmidi->card->module);
536 	snd_card_unref(rmidi->card);
537 	return err;
538 }
539 
close_substream(struct snd_rawmidi * rmidi,struct snd_rawmidi_substream * substream,int cleanup)540 static void close_substream(struct snd_rawmidi *rmidi,
541 			    struct snd_rawmidi_substream *substream,
542 			    int cleanup)
543 {
544 	if (--substream->use_count)
545 		return;
546 
547 	if (cleanup) {
548 		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
549 			snd_rawmidi_input_trigger(substream, 0);
550 		else {
551 			if (substream->active_sensing) {
552 				unsigned char buf = 0xfe;
553 				/* sending single active sensing message
554 				 * to shut the device up
555 				 */
556 				snd_rawmidi_kernel_write(substream, &buf, 1);
557 			}
558 			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
559 				snd_rawmidi_output_trigger(substream, 0);
560 		}
561 		snd_rawmidi_buffer_ref_sync(substream);
562 	}
563 	spin_lock_irq(&substream->lock);
564 	substream->opened = 0;
565 	substream->append = 0;
566 	spin_unlock_irq(&substream->lock);
567 	substream->ops->close(substream);
568 	if (substream->runtime->private_free)
569 		substream->runtime->private_free(substream);
570 	snd_rawmidi_runtime_free(substream);
571 	put_pid(substream->pid);
572 	substream->pid = NULL;
573 	rmidi->streams[substream->stream].substream_opened--;
574 }
575 
rawmidi_release_priv(struct snd_rawmidi_file * rfile)576 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
577 {
578 	struct snd_rawmidi *rmidi;
579 
580 	rmidi = rfile->rmidi;
581 	mutex_lock(&rmidi->open_mutex);
582 	if (rfile->input) {
583 		close_substream(rmidi, rfile->input, 1);
584 		rfile->input = NULL;
585 	}
586 	if (rfile->output) {
587 		close_substream(rmidi, rfile->output, 1);
588 		rfile->output = NULL;
589 	}
590 	rfile->rmidi = NULL;
591 	mutex_unlock(&rmidi->open_mutex);
592 	wake_up(&rmidi->open_wait);
593 }
594 
595 /* called from sound/core/seq/seq_midi.c */
snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)596 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
597 {
598 	struct snd_rawmidi *rmidi;
599 
600 	if (snd_BUG_ON(!rfile))
601 		return -ENXIO;
602 
603 	rmidi = rfile->rmidi;
604 	rawmidi_release_priv(rfile);
605 	module_put(rmidi->card->module);
606 	return 0;
607 }
608 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
609 
snd_rawmidi_release(struct inode * inode,struct file * file)610 static int snd_rawmidi_release(struct inode *inode, struct file *file)
611 {
612 	struct snd_rawmidi_file *rfile;
613 	struct snd_rawmidi *rmidi;
614 	struct module *module;
615 
616 	rfile = file->private_data;
617 	rmidi = rfile->rmidi;
618 	rawmidi_release_priv(rfile);
619 	kfree(rfile);
620 	module = rmidi->card->module;
621 	snd_card_file_remove(rmidi->card, file);
622 	module_put(module);
623 	return 0;
624 }
625 
snd_rawmidi_info(struct snd_rawmidi_substream * substream,struct snd_rawmidi_info * info)626 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
627 			    struct snd_rawmidi_info *info)
628 {
629 	struct snd_rawmidi *rmidi;
630 
631 	if (substream == NULL)
632 		return -ENODEV;
633 	rmidi = substream->rmidi;
634 	memset(info, 0, sizeof(*info));
635 	info->card = rmidi->card->number;
636 	info->device = rmidi->device;
637 	info->subdevice = substream->number;
638 	info->stream = substream->stream;
639 	info->flags = rmidi->info_flags;
640 	strcpy(info->id, rmidi->id);
641 	strcpy(info->name, rmidi->name);
642 	strcpy(info->subname, substream->name);
643 	info->subdevices_count = substream->pstr->substream_count;
644 	info->subdevices_avail = (substream->pstr->substream_count -
645 				  substream->pstr->substream_opened);
646 	return 0;
647 }
648 
snd_rawmidi_info_user(struct snd_rawmidi_substream * substream,struct snd_rawmidi_info __user * _info)649 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
650 				 struct snd_rawmidi_info __user *_info)
651 {
652 	struct snd_rawmidi_info info;
653 	int err;
654 
655 	err = snd_rawmidi_info(substream, &info);
656 	if (err < 0)
657 		return err;
658 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
659 		return -EFAULT;
660 	return 0;
661 }
662 
__snd_rawmidi_info_select(struct snd_card * card,struct snd_rawmidi_info * info)663 static int __snd_rawmidi_info_select(struct snd_card *card,
664 				     struct snd_rawmidi_info *info)
665 {
666 	struct snd_rawmidi *rmidi;
667 	struct snd_rawmidi_str *pstr;
668 	struct snd_rawmidi_substream *substream;
669 
670 	rmidi = snd_rawmidi_search(card, info->device);
671 	if (!rmidi)
672 		return -ENXIO;
673 	if (info->stream < 0 || info->stream > 1)
674 		return -EINVAL;
675 	info->stream = array_index_nospec(info->stream, 2);
676 	pstr = &rmidi->streams[info->stream];
677 	if (pstr->substream_count == 0)
678 		return -ENOENT;
679 	if (info->subdevice >= pstr->substream_count)
680 		return -ENXIO;
681 	list_for_each_entry(substream, &pstr->substreams, list) {
682 		if ((unsigned int)substream->number == info->subdevice)
683 			return snd_rawmidi_info(substream, info);
684 	}
685 	return -ENXIO;
686 }
687 
snd_rawmidi_info_select(struct snd_card * card,struct snd_rawmidi_info * info)688 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
689 {
690 	int ret;
691 
692 	mutex_lock(&register_mutex);
693 	ret = __snd_rawmidi_info_select(card, info);
694 	mutex_unlock(&register_mutex);
695 	return ret;
696 }
697 EXPORT_SYMBOL(snd_rawmidi_info_select);
698 
snd_rawmidi_info_select_user(struct snd_card * card,struct snd_rawmidi_info __user * _info)699 static int snd_rawmidi_info_select_user(struct snd_card *card,
700 					struct snd_rawmidi_info __user *_info)
701 {
702 	int err;
703 	struct snd_rawmidi_info info;
704 
705 	if (get_user(info.device, &_info->device))
706 		return -EFAULT;
707 	if (get_user(info.stream, &_info->stream))
708 		return -EFAULT;
709 	if (get_user(info.subdevice, &_info->subdevice))
710 		return -EFAULT;
711 	err = snd_rawmidi_info_select(card, &info);
712 	if (err < 0)
713 		return err;
714 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
715 		return -EFAULT;
716 	return 0;
717 }
718 
resize_runtime_buffer(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params,bool is_input)719 static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
720 				 struct snd_rawmidi_params *params,
721 				 bool is_input)
722 {
723 	struct snd_rawmidi_runtime *runtime = substream->runtime;
724 	char *newbuf, *oldbuf;
725 	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
726 
727 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
728 		return -EINVAL;
729 	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
730 		return -EINVAL;
731 	if (params->avail_min < 1 || params->avail_min > params->buffer_size)
732 		return -EINVAL;
733 	if (params->buffer_size != runtime->buffer_size) {
734 		newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
735 		if (!newbuf)
736 			return -ENOMEM;
737 		spin_lock_irq(&substream->lock);
738 		if (runtime->buffer_ref) {
739 			spin_unlock_irq(&substream->lock);
740 			kvfree(newbuf);
741 			return -EBUSY;
742 		}
743 		oldbuf = runtime->buffer;
744 		runtime->buffer = newbuf;
745 		runtime->buffer_size = params->buffer_size;
746 		__reset_runtime_ptrs(runtime, is_input);
747 		spin_unlock_irq(&substream->lock);
748 		kvfree(oldbuf);
749 	}
750 	runtime->avail_min = params->avail_min;
751 	return 0;
752 }
753 
snd_rawmidi_output_params(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params)754 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
755 			      struct snd_rawmidi_params *params)
756 {
757 	int err;
758 
759 	snd_rawmidi_drain_output(substream);
760 	mutex_lock(&substream->rmidi->open_mutex);
761 	if (substream->append && substream->use_count > 1)
762 		err = -EBUSY;
763 	else
764 		err = resize_runtime_buffer(substream, params, false);
765 
766 	if (!err)
767 		substream->active_sensing = !params->no_active_sensing;
768 	mutex_unlock(&substream->rmidi->open_mutex);
769 	return err;
770 }
771 EXPORT_SYMBOL(snd_rawmidi_output_params);
772 
snd_rawmidi_input_params(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params)773 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
774 			     struct snd_rawmidi_params *params)
775 {
776 	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
777 	unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
778 	int err;
779 
780 	snd_rawmidi_drain_input(substream);
781 	mutex_lock(&substream->rmidi->open_mutex);
782 	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
783 		err = -EINVAL;
784 	else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
785 		err = -EINVAL;
786 	else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
787 		err = -EINVAL;
788 	else
789 		err = resize_runtime_buffer(substream, params, true);
790 
791 	if (!err) {
792 		substream->framing = framing;
793 		substream->clock_type = clock_type;
794 	}
795 	mutex_unlock(&substream->rmidi->open_mutex);
796 	return 0;
797 }
798 EXPORT_SYMBOL(snd_rawmidi_input_params);
799 
snd_rawmidi_output_status(struct snd_rawmidi_substream * substream,struct snd_rawmidi_status64 * status)800 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
801 				     struct snd_rawmidi_status64 *status)
802 {
803 	struct snd_rawmidi_runtime *runtime = substream->runtime;
804 
805 	memset(status, 0, sizeof(*status));
806 	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
807 	spin_lock_irq(&substream->lock);
808 	status->avail = runtime->avail;
809 	spin_unlock_irq(&substream->lock);
810 	return 0;
811 }
812 
snd_rawmidi_input_status(struct snd_rawmidi_substream * substream,struct snd_rawmidi_status64 * status)813 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
814 				    struct snd_rawmidi_status64 *status)
815 {
816 	struct snd_rawmidi_runtime *runtime = substream->runtime;
817 
818 	memset(status, 0, sizeof(*status));
819 	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
820 	spin_lock_irq(&substream->lock);
821 	status->avail = runtime->avail;
822 	status->xruns = runtime->xruns;
823 	runtime->xruns = 0;
824 	spin_unlock_irq(&substream->lock);
825 	return 0;
826 }
827 
snd_rawmidi_ioctl_status32(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status32 __user * argp)828 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
829 				      struct snd_rawmidi_status32 __user *argp)
830 {
831 	int err = 0;
832 	struct snd_rawmidi_status32 __user *status = argp;
833 	struct snd_rawmidi_status32 status32;
834 	struct snd_rawmidi_status64 status64;
835 
836 	if (copy_from_user(&status32, argp,
837 			   sizeof(struct snd_rawmidi_status32)))
838 		return -EFAULT;
839 
840 	switch (status32.stream) {
841 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
842 		if (rfile->output == NULL)
843 			return -EINVAL;
844 		err = snd_rawmidi_output_status(rfile->output, &status64);
845 		break;
846 	case SNDRV_RAWMIDI_STREAM_INPUT:
847 		if (rfile->input == NULL)
848 			return -EINVAL;
849 		err = snd_rawmidi_input_status(rfile->input, &status64);
850 		break;
851 	default:
852 		return -EINVAL;
853 	}
854 	if (err < 0)
855 		return err;
856 
857 	status32 = (struct snd_rawmidi_status32) {
858 		.stream = status64.stream,
859 		.tstamp_sec = status64.tstamp_sec,
860 		.tstamp_nsec = status64.tstamp_nsec,
861 		.avail = status64.avail,
862 		.xruns = status64.xruns,
863 	};
864 
865 	if (copy_to_user(status, &status32, sizeof(*status)))
866 		return -EFAULT;
867 
868 	return 0;
869 }
870 
snd_rawmidi_ioctl_status64(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status64 __user * argp)871 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
872 				      struct snd_rawmidi_status64 __user *argp)
873 {
874 	int err = 0;
875 	struct snd_rawmidi_status64 status;
876 
877 	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
878 		return -EFAULT;
879 
880 	switch (status.stream) {
881 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
882 		if (rfile->output == NULL)
883 			return -EINVAL;
884 		err = snd_rawmidi_output_status(rfile->output, &status);
885 		break;
886 	case SNDRV_RAWMIDI_STREAM_INPUT:
887 		if (rfile->input == NULL)
888 			return -EINVAL;
889 		err = snd_rawmidi_input_status(rfile->input, &status);
890 		break;
891 	default:
892 		return -EINVAL;
893 	}
894 	if (err < 0)
895 		return err;
896 	if (copy_to_user(argp, &status,
897 			 sizeof(struct snd_rawmidi_status64)))
898 		return -EFAULT;
899 	return 0;
900 }
901 
snd_rawmidi_ioctl(struct file * file,unsigned int cmd,unsigned long arg)902 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
903 {
904 	struct snd_rawmidi_file *rfile;
905 	void __user *argp = (void __user *)arg;
906 
907 	rfile = file->private_data;
908 	if (((cmd >> 8) & 0xff) != 'W')
909 		return -ENOTTY;
910 	switch (cmd) {
911 	case SNDRV_RAWMIDI_IOCTL_PVERSION:
912 		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
913 	case SNDRV_RAWMIDI_IOCTL_INFO:
914 	{
915 		int stream;
916 		struct snd_rawmidi_info __user *info = argp;
917 
918 		if (get_user(stream, &info->stream))
919 			return -EFAULT;
920 		switch (stream) {
921 		case SNDRV_RAWMIDI_STREAM_INPUT:
922 			return snd_rawmidi_info_user(rfile->input, info);
923 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
924 			return snd_rawmidi_info_user(rfile->output, info);
925 		default:
926 			return -EINVAL;
927 		}
928 	}
929 	case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
930 		if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
931 			return -EFAULT;
932 		return 0;
933 
934 	case SNDRV_RAWMIDI_IOCTL_PARAMS:
935 	{
936 		struct snd_rawmidi_params params;
937 
938 		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
939 			return -EFAULT;
940 		if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
941 			params.mode = 0;
942 			memset(params.reserved, 0, sizeof(params.reserved));
943 		}
944 		switch (params.stream) {
945 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
946 			if (rfile->output == NULL)
947 				return -EINVAL;
948 			return snd_rawmidi_output_params(rfile->output, &params);
949 		case SNDRV_RAWMIDI_STREAM_INPUT:
950 			if (rfile->input == NULL)
951 				return -EINVAL;
952 			return snd_rawmidi_input_params(rfile->input, &params);
953 		default:
954 			return -EINVAL;
955 		}
956 	}
957 	case SNDRV_RAWMIDI_IOCTL_STATUS32:
958 		return snd_rawmidi_ioctl_status32(rfile, argp);
959 	case SNDRV_RAWMIDI_IOCTL_STATUS64:
960 		return snd_rawmidi_ioctl_status64(rfile, argp);
961 	case SNDRV_RAWMIDI_IOCTL_DROP:
962 	{
963 		int val;
964 
965 		if (get_user(val, (int __user *) argp))
966 			return -EFAULT;
967 		switch (val) {
968 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
969 			if (rfile->output == NULL)
970 				return -EINVAL;
971 			return snd_rawmidi_drop_output(rfile->output);
972 		default:
973 			return -EINVAL;
974 		}
975 	}
976 	case SNDRV_RAWMIDI_IOCTL_DRAIN:
977 	{
978 		int val;
979 
980 		if (get_user(val, (int __user *) argp))
981 			return -EFAULT;
982 		switch (val) {
983 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
984 			if (rfile->output == NULL)
985 				return -EINVAL;
986 			return snd_rawmidi_drain_output(rfile->output);
987 		case SNDRV_RAWMIDI_STREAM_INPUT:
988 			if (rfile->input == NULL)
989 				return -EINVAL;
990 			return snd_rawmidi_drain_input(rfile->input);
991 		default:
992 			return -EINVAL;
993 		}
994 	}
995 	default:
996 		rmidi_dbg(rfile->rmidi,
997 			  "rawmidi: unknown command = 0x%x\n", cmd);
998 	}
999 	return -ENOTTY;
1000 }
1001 
snd_rawmidi_control_ioctl(struct snd_card * card,struct snd_ctl_file * control,unsigned int cmd,unsigned long arg)1002 static int snd_rawmidi_control_ioctl(struct snd_card *card,
1003 				     struct snd_ctl_file *control,
1004 				     unsigned int cmd,
1005 				     unsigned long arg)
1006 {
1007 	void __user *argp = (void __user *)arg;
1008 
1009 	switch (cmd) {
1010 	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1011 	{
1012 		int device;
1013 
1014 		if (get_user(device, (int __user *)argp))
1015 			return -EFAULT;
1016 		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1017 			device = SNDRV_RAWMIDI_DEVICES - 1;
1018 		mutex_lock(&register_mutex);
1019 		device = device < 0 ? 0 : device + 1;
1020 		while (device < SNDRV_RAWMIDI_DEVICES) {
1021 			if (snd_rawmidi_search(card, device))
1022 				break;
1023 			device++;
1024 		}
1025 		if (device == SNDRV_RAWMIDI_DEVICES)
1026 			device = -1;
1027 		mutex_unlock(&register_mutex);
1028 		if (put_user(device, (int __user *)argp))
1029 			return -EFAULT;
1030 		return 0;
1031 	}
1032 	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1033 	{
1034 		int val;
1035 
1036 		if (get_user(val, (int __user *)argp))
1037 			return -EFAULT;
1038 		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1039 		return 0;
1040 	}
1041 	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1042 		return snd_rawmidi_info_select_user(card, argp);
1043 	}
1044 	return -ENOIOCTLCMD;
1045 }
1046 
receive_with_tstamp_framing(struct snd_rawmidi_substream * substream,const unsigned char * buffer,int src_count,const struct timespec64 * tstamp)1047 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1048 			const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1049 {
1050 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1051 	struct snd_rawmidi_framing_tstamp *dest_ptr;
1052 	struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1053 	int dest_frames = 0;
1054 	int orig_count = src_count;
1055 	int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1056 
1057 	BUILD_BUG_ON(frame_size != 0x20);
1058 	if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1059 		return -EINVAL;
1060 
1061 	while (src_count > 0) {
1062 		if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1063 			runtime->xruns += src_count;
1064 			break;
1065 		}
1066 		if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1067 			frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1068 		else {
1069 			frame.length = src_count;
1070 			memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1071 		}
1072 		memcpy(frame.data, buffer, frame.length);
1073 		buffer += frame.length;
1074 		src_count -= frame.length;
1075 		dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1076 		*dest_ptr = frame;
1077 		runtime->avail += frame_size;
1078 		runtime->hw_ptr += frame_size;
1079 		runtime->hw_ptr %= runtime->buffer_size;
1080 		dest_frames++;
1081 	}
1082 	return orig_count - src_count;
1083 }
1084 
get_framing_tstamp(struct snd_rawmidi_substream * substream)1085 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1086 {
1087 	struct timespec64 ts64 = {0, 0};
1088 
1089 	switch (substream->clock_type) {
1090 	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1091 		ktime_get_raw_ts64(&ts64);
1092 		break;
1093 	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1094 		ktime_get_ts64(&ts64);
1095 		break;
1096 	case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1097 		ktime_get_real_ts64(&ts64);
1098 		break;
1099 	}
1100 	return ts64;
1101 }
1102 
1103 /**
1104  * snd_rawmidi_receive - receive the input data from the device
1105  * @substream: the rawmidi substream
1106  * @buffer: the buffer pointer
1107  * @count: the data size to read
1108  *
1109  * Reads the data from the internal buffer.
1110  *
1111  * Return: The size of read data, or a negative error code on failure.
1112  */
snd_rawmidi_receive(struct snd_rawmidi_substream * substream,const unsigned char * buffer,int count)1113 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1114 			const unsigned char *buffer, int count)
1115 {
1116 	unsigned long flags;
1117 	struct timespec64 ts64 = get_framing_tstamp(substream);
1118 	int result = 0, count1;
1119 	struct snd_rawmidi_runtime *runtime;
1120 
1121 	spin_lock_irqsave(&substream->lock, flags);
1122 	if (!substream->opened) {
1123 		result = -EBADFD;
1124 		goto unlock;
1125 	}
1126 	runtime = substream->runtime;
1127 	if (!runtime || !runtime->buffer) {
1128 		rmidi_dbg(substream->rmidi,
1129 			  "snd_rawmidi_receive: input is not active!!!\n");
1130 		result = -EINVAL;
1131 		goto unlock;
1132 	}
1133 
1134 	if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1135 		result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1136 	} else if (count == 1) {	/* special case, faster code */
1137 		substream->bytes++;
1138 		if (runtime->avail < runtime->buffer_size) {
1139 			runtime->buffer[runtime->hw_ptr++] = buffer[0];
1140 			runtime->hw_ptr %= runtime->buffer_size;
1141 			runtime->avail++;
1142 			result++;
1143 		} else {
1144 			runtime->xruns++;
1145 		}
1146 	} else {
1147 		substream->bytes += count;
1148 		count1 = runtime->buffer_size - runtime->hw_ptr;
1149 		if (count1 > count)
1150 			count1 = count;
1151 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1152 			count1 = runtime->buffer_size - runtime->avail;
1153 		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1154 		runtime->hw_ptr += count1;
1155 		runtime->hw_ptr %= runtime->buffer_size;
1156 		runtime->avail += count1;
1157 		count -= count1;
1158 		result += count1;
1159 		if (count > 0) {
1160 			buffer += count1;
1161 			count1 = count;
1162 			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1163 				count1 = runtime->buffer_size - runtime->avail;
1164 				runtime->xruns += count - count1;
1165 			}
1166 			if (count1 > 0) {
1167 				memcpy(runtime->buffer, buffer, count1);
1168 				runtime->hw_ptr = count1;
1169 				runtime->avail += count1;
1170 				result += count1;
1171 			}
1172 		}
1173 	}
1174 	if (result > 0) {
1175 		if (runtime->event)
1176 			schedule_work(&runtime->event_work);
1177 		else if (__snd_rawmidi_ready(runtime))
1178 			wake_up(&runtime->sleep);
1179 	}
1180  unlock:
1181 	spin_unlock_irqrestore(&substream->lock, flags);
1182 	return result;
1183 }
1184 EXPORT_SYMBOL(snd_rawmidi_receive);
1185 
snd_rawmidi_kernel_read1(struct snd_rawmidi_substream * substream,unsigned char __user * userbuf,unsigned char * kernelbuf,long count)1186 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1187 				     unsigned char __user *userbuf,
1188 				     unsigned char *kernelbuf, long count)
1189 {
1190 	unsigned long flags;
1191 	long result = 0, count1;
1192 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1193 	unsigned long appl_ptr;
1194 	int err = 0;
1195 
1196 	spin_lock_irqsave(&substream->lock, flags);
1197 	snd_rawmidi_buffer_ref(runtime);
1198 	while (count > 0 && runtime->avail) {
1199 		count1 = runtime->buffer_size - runtime->appl_ptr;
1200 		if (count1 > count)
1201 			count1 = count;
1202 		if (count1 > (int)runtime->avail)
1203 			count1 = runtime->avail;
1204 
1205 		/* update runtime->appl_ptr before unlocking for userbuf */
1206 		appl_ptr = runtime->appl_ptr;
1207 		runtime->appl_ptr += count1;
1208 		runtime->appl_ptr %= runtime->buffer_size;
1209 		runtime->avail -= count1;
1210 
1211 		if (kernelbuf)
1212 			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1213 		if (userbuf) {
1214 			spin_unlock_irqrestore(&substream->lock, flags);
1215 			if (copy_to_user(userbuf + result,
1216 					 runtime->buffer + appl_ptr, count1))
1217 				err = -EFAULT;
1218 			spin_lock_irqsave(&substream->lock, flags);
1219 			if (err)
1220 				goto out;
1221 		}
1222 		result += count1;
1223 		count -= count1;
1224 	}
1225  out:
1226 	snd_rawmidi_buffer_unref(runtime);
1227 	spin_unlock_irqrestore(&substream->lock, flags);
1228 	return result > 0 ? result : err;
1229 }
1230 
snd_rawmidi_kernel_read(struct snd_rawmidi_substream * substream,unsigned char * buf,long count)1231 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1232 			     unsigned char *buf, long count)
1233 {
1234 	snd_rawmidi_input_trigger(substream, 1);
1235 	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1236 }
1237 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1238 
snd_rawmidi_read(struct file * file,char __user * buf,size_t count,loff_t * offset)1239 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1240 				loff_t *offset)
1241 {
1242 	long result;
1243 	int count1;
1244 	struct snd_rawmidi_file *rfile;
1245 	struct snd_rawmidi_substream *substream;
1246 	struct snd_rawmidi_runtime *runtime;
1247 
1248 	rfile = file->private_data;
1249 	substream = rfile->input;
1250 	if (substream == NULL)
1251 		return -EIO;
1252 	runtime = substream->runtime;
1253 	snd_rawmidi_input_trigger(substream, 1);
1254 	result = 0;
1255 	while (count > 0) {
1256 		spin_lock_irq(&substream->lock);
1257 		while (!__snd_rawmidi_ready(runtime)) {
1258 			wait_queue_entry_t wait;
1259 
1260 			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1261 				spin_unlock_irq(&substream->lock);
1262 				return result > 0 ? result : -EAGAIN;
1263 			}
1264 			init_waitqueue_entry(&wait, current);
1265 			add_wait_queue(&runtime->sleep, &wait);
1266 			set_current_state(TASK_INTERRUPTIBLE);
1267 			spin_unlock_irq(&substream->lock);
1268 			schedule();
1269 			remove_wait_queue(&runtime->sleep, &wait);
1270 			if (rfile->rmidi->card->shutdown)
1271 				return -ENODEV;
1272 			if (signal_pending(current))
1273 				return result > 0 ? result : -ERESTARTSYS;
1274 			spin_lock_irq(&substream->lock);
1275 			if (!runtime->avail) {
1276 				spin_unlock_irq(&substream->lock);
1277 				return result > 0 ? result : -EIO;
1278 			}
1279 		}
1280 		spin_unlock_irq(&substream->lock);
1281 		count1 = snd_rawmidi_kernel_read1(substream,
1282 						  (unsigned char __user *)buf,
1283 						  NULL/*kernelbuf*/,
1284 						  count);
1285 		if (count1 < 0)
1286 			return result > 0 ? result : count1;
1287 		result += count1;
1288 		buf += count1;
1289 		count -= count1;
1290 	}
1291 	return result;
1292 }
1293 
1294 /**
1295  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1296  * @substream: the rawmidi substream
1297  *
1298  * Return: 1 if the internal output buffer is empty, 0 if not.
1299  */
snd_rawmidi_transmit_empty(struct snd_rawmidi_substream * substream)1300 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1301 {
1302 	struct snd_rawmidi_runtime *runtime;
1303 	int result;
1304 	unsigned long flags;
1305 
1306 	spin_lock_irqsave(&substream->lock, flags);
1307 	runtime = substream->runtime;
1308 	if (!substream->opened || !runtime || !runtime->buffer) {
1309 		rmidi_dbg(substream->rmidi,
1310 			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1311 		result = 1;
1312 	} else {
1313 		result = runtime->avail >= runtime->buffer_size;
1314 	}
1315 	spin_unlock_irqrestore(&substream->lock, flags);
1316 	return result;
1317 }
1318 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1319 
1320 /*
1321  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1322  * @substream: the rawmidi substream
1323  * @buffer: the buffer pointer
1324  * @count: data size to transfer
1325  *
1326  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1327  */
__snd_rawmidi_transmit_peek(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1328 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1329 				       unsigned char *buffer, int count)
1330 {
1331 	int result, count1;
1332 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1333 
1334 	if (runtime->buffer == NULL) {
1335 		rmidi_dbg(substream->rmidi,
1336 			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1337 		return -EINVAL;
1338 	}
1339 	result = 0;
1340 	if (runtime->avail >= runtime->buffer_size) {
1341 		/* warning: lowlevel layer MUST trigger down the hardware */
1342 		goto __skip;
1343 	}
1344 	if (count == 1) {	/* special case, faster code */
1345 		*buffer = runtime->buffer[runtime->hw_ptr];
1346 		result++;
1347 	} else {
1348 		count1 = runtime->buffer_size - runtime->hw_ptr;
1349 		if (count1 > count)
1350 			count1 = count;
1351 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1352 			count1 = runtime->buffer_size - runtime->avail;
1353 		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1354 		count -= count1;
1355 		result += count1;
1356 		if (count > 0) {
1357 			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1358 				count = runtime->buffer_size - runtime->avail - count1;
1359 			memcpy(buffer + count1, runtime->buffer, count);
1360 			result += count;
1361 		}
1362 	}
1363       __skip:
1364 	return result;
1365 }
1366 
1367 /**
1368  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1369  * @substream: the rawmidi substream
1370  * @buffer: the buffer pointer
1371  * @count: data size to transfer
1372  *
1373  * Copies data from the internal output buffer to the given buffer.
1374  *
1375  * Call this in the interrupt handler when the midi output is ready,
1376  * and call snd_rawmidi_transmit_ack() after the transmission is
1377  * finished.
1378  *
1379  * Return: The size of copied data, or a negative error code on failure.
1380  */
snd_rawmidi_transmit_peek(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1381 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1382 			      unsigned char *buffer, int count)
1383 {
1384 	int result;
1385 	unsigned long flags;
1386 
1387 	spin_lock_irqsave(&substream->lock, flags);
1388 	if (!substream->opened || !substream->runtime)
1389 		result = -EBADFD;
1390 	else
1391 		result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1392 	spin_unlock_irqrestore(&substream->lock, flags);
1393 	return result;
1394 }
1395 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1396 
1397 /*
1398  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1399  * @substream: the rawmidi substream
1400  * @count: the transferred count
1401  *
1402  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1403  */
__snd_rawmidi_transmit_ack(struct snd_rawmidi_substream * substream,int count)1404 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1405 				      int count)
1406 {
1407 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1408 
1409 	if (runtime->buffer == NULL) {
1410 		rmidi_dbg(substream->rmidi,
1411 			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1412 		return -EINVAL;
1413 	}
1414 	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1415 	runtime->hw_ptr += count;
1416 	runtime->hw_ptr %= runtime->buffer_size;
1417 	runtime->avail += count;
1418 	substream->bytes += count;
1419 	if (count > 0) {
1420 		if (runtime->drain || __snd_rawmidi_ready(runtime))
1421 			wake_up(&runtime->sleep);
1422 	}
1423 	return count;
1424 }
1425 
1426 /**
1427  * snd_rawmidi_transmit_ack - acknowledge the transmission
1428  * @substream: the rawmidi substream
1429  * @count: the transferred count
1430  *
1431  * Advances the hardware pointer for the internal output buffer with
1432  * the given size and updates the condition.
1433  * Call after the transmission is finished.
1434  *
1435  * Return: The advanced size if successful, or a negative error code on failure.
1436  */
snd_rawmidi_transmit_ack(struct snd_rawmidi_substream * substream,int count)1437 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1438 {
1439 	int result;
1440 	unsigned long flags;
1441 
1442 	spin_lock_irqsave(&substream->lock, flags);
1443 	if (!substream->opened || !substream->runtime)
1444 		result = -EBADFD;
1445 	else
1446 		result = __snd_rawmidi_transmit_ack(substream, count);
1447 	spin_unlock_irqrestore(&substream->lock, flags);
1448 	return result;
1449 }
1450 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1451 
1452 /**
1453  * snd_rawmidi_transmit - copy from the buffer to the device
1454  * @substream: the rawmidi substream
1455  * @buffer: the buffer pointer
1456  * @count: the data size to transfer
1457  *
1458  * Copies data from the buffer to the device and advances the pointer.
1459  *
1460  * Return: The copied size if successful, or a negative error code on failure.
1461  */
snd_rawmidi_transmit(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1462 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1463 			 unsigned char *buffer, int count)
1464 {
1465 	int result;
1466 	unsigned long flags;
1467 
1468 	spin_lock_irqsave(&substream->lock, flags);
1469 	if (!substream->opened)
1470 		result = -EBADFD;
1471 	else {
1472 		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1473 		if (count <= 0)
1474 			result = count;
1475 		else
1476 			result = __snd_rawmidi_transmit_ack(substream, count);
1477 	}
1478 	spin_unlock_irqrestore(&substream->lock, flags);
1479 	return result;
1480 }
1481 EXPORT_SYMBOL(snd_rawmidi_transmit);
1482 
1483 /**
1484  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1485  * @substream: rawmidi substream
1486  *
1487  * Return: the number of discarded bytes
1488  */
snd_rawmidi_proceed(struct snd_rawmidi_substream * substream)1489 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1490 {
1491 	struct snd_rawmidi_runtime *runtime;
1492 	unsigned long flags;
1493 	int count = 0;
1494 
1495 	spin_lock_irqsave(&substream->lock, flags);
1496 	runtime = substream->runtime;
1497 	if (substream->opened && runtime &&
1498 	    runtime->avail < runtime->buffer_size) {
1499 		count = runtime->buffer_size - runtime->avail;
1500 		__snd_rawmidi_transmit_ack(substream, count);
1501 	}
1502 	spin_unlock_irqrestore(&substream->lock, flags);
1503 	return count;
1504 }
1505 EXPORT_SYMBOL(snd_rawmidi_proceed);
1506 
snd_rawmidi_kernel_write1(struct snd_rawmidi_substream * substream,const unsigned char __user * userbuf,const unsigned char * kernelbuf,long count)1507 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1508 				      const unsigned char __user *userbuf,
1509 				      const unsigned char *kernelbuf,
1510 				      long count)
1511 {
1512 	unsigned long flags;
1513 	long count1, result;
1514 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1515 	unsigned long appl_ptr;
1516 
1517 	if (!kernelbuf && !userbuf)
1518 		return -EINVAL;
1519 	if (snd_BUG_ON(!runtime->buffer))
1520 		return -EINVAL;
1521 
1522 	result = 0;
1523 	spin_lock_irqsave(&substream->lock, flags);
1524 	if (substream->append) {
1525 		if ((long)runtime->avail < count) {
1526 			spin_unlock_irqrestore(&substream->lock, flags);
1527 			return -EAGAIN;
1528 		}
1529 	}
1530 	snd_rawmidi_buffer_ref(runtime);
1531 	while (count > 0 && runtime->avail > 0) {
1532 		count1 = runtime->buffer_size - runtime->appl_ptr;
1533 		if (count1 > count)
1534 			count1 = count;
1535 		if (count1 > (long)runtime->avail)
1536 			count1 = runtime->avail;
1537 
1538 		/* update runtime->appl_ptr before unlocking for userbuf */
1539 		appl_ptr = runtime->appl_ptr;
1540 		runtime->appl_ptr += count1;
1541 		runtime->appl_ptr %= runtime->buffer_size;
1542 		runtime->avail -= count1;
1543 
1544 		if (kernelbuf)
1545 			memcpy(runtime->buffer + appl_ptr,
1546 			       kernelbuf + result, count1);
1547 		else if (userbuf) {
1548 			spin_unlock_irqrestore(&substream->lock, flags);
1549 			if (copy_from_user(runtime->buffer + appl_ptr,
1550 					   userbuf + result, count1)) {
1551 				spin_lock_irqsave(&substream->lock, flags);
1552 				result = result > 0 ? result : -EFAULT;
1553 				goto __end;
1554 			}
1555 			spin_lock_irqsave(&substream->lock, flags);
1556 		}
1557 		result += count1;
1558 		count -= count1;
1559 	}
1560       __end:
1561 	count1 = runtime->avail < runtime->buffer_size;
1562 	snd_rawmidi_buffer_unref(runtime);
1563 	spin_unlock_irqrestore(&substream->lock, flags);
1564 	if (count1)
1565 		snd_rawmidi_output_trigger(substream, 1);
1566 	return result;
1567 }
1568 
snd_rawmidi_kernel_write(struct snd_rawmidi_substream * substream,const unsigned char * buf,long count)1569 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1570 			      const unsigned char *buf, long count)
1571 {
1572 	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1573 }
1574 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1575 
snd_rawmidi_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)1576 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1577 				 size_t count, loff_t *offset)
1578 {
1579 	long result, timeout;
1580 	int count1;
1581 	struct snd_rawmidi_file *rfile;
1582 	struct snd_rawmidi_runtime *runtime;
1583 	struct snd_rawmidi_substream *substream;
1584 
1585 	rfile = file->private_data;
1586 	substream = rfile->output;
1587 	runtime = substream->runtime;
1588 	/* we cannot put an atomic message to our buffer */
1589 	if (substream->append && count > runtime->buffer_size)
1590 		return -EIO;
1591 	result = 0;
1592 	while (count > 0) {
1593 		spin_lock_irq(&substream->lock);
1594 		while (!snd_rawmidi_ready_append(substream, count)) {
1595 			wait_queue_entry_t wait;
1596 
1597 			if (file->f_flags & O_NONBLOCK) {
1598 				spin_unlock_irq(&substream->lock);
1599 				return result > 0 ? result : -EAGAIN;
1600 			}
1601 			init_waitqueue_entry(&wait, current);
1602 			add_wait_queue(&runtime->sleep, &wait);
1603 			set_current_state(TASK_INTERRUPTIBLE);
1604 			spin_unlock_irq(&substream->lock);
1605 			timeout = schedule_timeout(30 * HZ);
1606 			remove_wait_queue(&runtime->sleep, &wait);
1607 			if (rfile->rmidi->card->shutdown)
1608 				return -ENODEV;
1609 			if (signal_pending(current))
1610 				return result > 0 ? result : -ERESTARTSYS;
1611 			spin_lock_irq(&substream->lock);
1612 			if (!runtime->avail && !timeout) {
1613 				spin_unlock_irq(&substream->lock);
1614 				return result > 0 ? result : -EIO;
1615 			}
1616 		}
1617 		spin_unlock_irq(&substream->lock);
1618 		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1619 		if (count1 < 0)
1620 			return result > 0 ? result : count1;
1621 		result += count1;
1622 		buf += count1;
1623 		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1624 			break;
1625 		count -= count1;
1626 	}
1627 	if (file->f_flags & O_DSYNC) {
1628 		spin_lock_irq(&substream->lock);
1629 		while (runtime->avail != runtime->buffer_size) {
1630 			wait_queue_entry_t wait;
1631 			unsigned int last_avail = runtime->avail;
1632 
1633 			init_waitqueue_entry(&wait, current);
1634 			add_wait_queue(&runtime->sleep, &wait);
1635 			set_current_state(TASK_INTERRUPTIBLE);
1636 			spin_unlock_irq(&substream->lock);
1637 			timeout = schedule_timeout(30 * HZ);
1638 			remove_wait_queue(&runtime->sleep, &wait);
1639 			if (signal_pending(current))
1640 				return result > 0 ? result : -ERESTARTSYS;
1641 			if (runtime->avail == last_avail && !timeout)
1642 				return result > 0 ? result : -EIO;
1643 			spin_lock_irq(&substream->lock);
1644 		}
1645 		spin_unlock_irq(&substream->lock);
1646 	}
1647 	return result;
1648 }
1649 
snd_rawmidi_poll(struct file * file,poll_table * wait)1650 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1651 {
1652 	struct snd_rawmidi_file *rfile;
1653 	struct snd_rawmidi_runtime *runtime;
1654 	__poll_t mask;
1655 
1656 	rfile = file->private_data;
1657 	if (rfile->input != NULL) {
1658 		runtime = rfile->input->runtime;
1659 		snd_rawmidi_input_trigger(rfile->input, 1);
1660 		poll_wait(file, &runtime->sleep, wait);
1661 	}
1662 	if (rfile->output != NULL) {
1663 		runtime = rfile->output->runtime;
1664 		poll_wait(file, &runtime->sleep, wait);
1665 	}
1666 	mask = 0;
1667 	if (rfile->input != NULL) {
1668 		if (snd_rawmidi_ready(rfile->input))
1669 			mask |= EPOLLIN | EPOLLRDNORM;
1670 	}
1671 	if (rfile->output != NULL) {
1672 		if (snd_rawmidi_ready(rfile->output))
1673 			mask |= EPOLLOUT | EPOLLWRNORM;
1674 	}
1675 	return mask;
1676 }
1677 
1678 /*
1679  */
1680 #ifdef CONFIG_COMPAT
1681 #include "rawmidi_compat.c"
1682 #else
1683 #define snd_rawmidi_ioctl_compat	NULL
1684 #endif
1685 
1686 /*
1687  */
1688 
snd_rawmidi_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1689 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1690 				       struct snd_info_buffer *buffer)
1691 {
1692 	struct snd_rawmidi *rmidi;
1693 	struct snd_rawmidi_substream *substream;
1694 	struct snd_rawmidi_runtime *runtime;
1695 	unsigned long buffer_size, avail, xruns;
1696 	unsigned int clock_type;
1697 	static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1698 
1699 	rmidi = entry->private_data;
1700 	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1701 	mutex_lock(&rmidi->open_mutex);
1702 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1703 		list_for_each_entry(substream,
1704 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1705 				    list) {
1706 			snd_iprintf(buffer,
1707 				    "Output %d\n"
1708 				    "  Tx bytes     : %lu\n",
1709 				    substream->number,
1710 				    (unsigned long) substream->bytes);
1711 			if (substream->opened) {
1712 				snd_iprintf(buffer,
1713 				    "  Owner PID    : %d\n",
1714 				    pid_vnr(substream->pid));
1715 				runtime = substream->runtime;
1716 				spin_lock_irq(&substream->lock);
1717 				buffer_size = runtime->buffer_size;
1718 				avail = runtime->avail;
1719 				spin_unlock_irq(&substream->lock);
1720 				snd_iprintf(buffer,
1721 				    "  Mode         : %s\n"
1722 				    "  Buffer size  : %lu\n"
1723 				    "  Avail        : %lu\n",
1724 				    runtime->oss ? "OSS compatible" : "native",
1725 				    buffer_size, avail);
1726 			}
1727 		}
1728 	}
1729 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1730 		list_for_each_entry(substream,
1731 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1732 				    list) {
1733 			snd_iprintf(buffer,
1734 				    "Input %d\n"
1735 				    "  Rx bytes     : %lu\n",
1736 				    substream->number,
1737 				    (unsigned long) substream->bytes);
1738 			if (substream->opened) {
1739 				snd_iprintf(buffer,
1740 					    "  Owner PID    : %d\n",
1741 					    pid_vnr(substream->pid));
1742 				runtime = substream->runtime;
1743 				spin_lock_irq(&substream->lock);
1744 				buffer_size = runtime->buffer_size;
1745 				avail = runtime->avail;
1746 				xruns = runtime->xruns;
1747 				spin_unlock_irq(&substream->lock);
1748 				snd_iprintf(buffer,
1749 					    "  Buffer size  : %lu\n"
1750 					    "  Avail        : %lu\n"
1751 					    "  Overruns     : %lu\n",
1752 					    buffer_size, avail, xruns);
1753 				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1754 					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1755 					if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1756 						snd_iprintf(buffer,
1757 							    "  Framing      : tstamp\n"
1758 							    "  Clock type   : %s\n",
1759 							    clock_names[clock_type]);
1760 				}
1761 			}
1762 		}
1763 	}
1764 	mutex_unlock(&rmidi->open_mutex);
1765 }
1766 
1767 /*
1768  *  Register functions
1769  */
1770 
1771 static const struct file_operations snd_rawmidi_f_ops = {
1772 	.owner =	THIS_MODULE,
1773 	.read =		snd_rawmidi_read,
1774 	.write =	snd_rawmidi_write,
1775 	.open =		snd_rawmidi_open,
1776 	.release =	snd_rawmidi_release,
1777 	.llseek =	no_llseek,
1778 	.poll =		snd_rawmidi_poll,
1779 	.unlocked_ioctl =	snd_rawmidi_ioctl,
1780 	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1781 };
1782 
snd_rawmidi_alloc_substreams(struct snd_rawmidi * rmidi,struct snd_rawmidi_str * stream,int direction,int count)1783 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1784 					struct snd_rawmidi_str *stream,
1785 					int direction,
1786 					int count)
1787 {
1788 	struct snd_rawmidi_substream *substream;
1789 	int idx;
1790 
1791 	for (idx = 0; idx < count; idx++) {
1792 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1793 		if (!substream)
1794 			return -ENOMEM;
1795 		substream->stream = direction;
1796 		substream->number = idx;
1797 		substream->rmidi = rmidi;
1798 		substream->pstr = stream;
1799 		spin_lock_init(&substream->lock);
1800 		list_add_tail(&substream->list, &stream->substreams);
1801 		stream->substream_count++;
1802 	}
1803 	return 0;
1804 }
1805 
release_rawmidi_device(struct device * dev)1806 static void release_rawmidi_device(struct device *dev)
1807 {
1808 	kfree(container_of(dev, struct snd_rawmidi, dev));
1809 }
1810 
1811 /**
1812  * snd_rawmidi_new - create a rawmidi instance
1813  * @card: the card instance
1814  * @id: the id string
1815  * @device: the device index
1816  * @output_count: the number of output streams
1817  * @input_count: the number of input streams
1818  * @rrawmidi: the pointer to store the new rawmidi instance
1819  *
1820  * Creates a new rawmidi instance.
1821  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1822  *
1823  * Return: Zero if successful, or a negative error code on failure.
1824  */
snd_rawmidi_new(struct snd_card * card,char * id,int device,int output_count,int input_count,struct snd_rawmidi ** rrawmidi)1825 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1826 		    int output_count, int input_count,
1827 		    struct snd_rawmidi **rrawmidi)
1828 {
1829 	struct snd_rawmidi *rmidi;
1830 	int err;
1831 	static const struct snd_device_ops ops = {
1832 		.dev_free = snd_rawmidi_dev_free,
1833 		.dev_register = snd_rawmidi_dev_register,
1834 		.dev_disconnect = snd_rawmidi_dev_disconnect,
1835 	};
1836 
1837 	if (snd_BUG_ON(!card))
1838 		return -ENXIO;
1839 	if (rrawmidi)
1840 		*rrawmidi = NULL;
1841 	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1842 	if (!rmidi)
1843 		return -ENOMEM;
1844 	rmidi->card = card;
1845 	rmidi->device = device;
1846 	mutex_init(&rmidi->open_mutex);
1847 	init_waitqueue_head(&rmidi->open_wait);
1848 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1849 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1850 
1851 	if (id != NULL)
1852 		strscpy(rmidi->id, id, sizeof(rmidi->id));
1853 
1854 	snd_device_initialize(&rmidi->dev, card);
1855 	rmidi->dev.release = release_rawmidi_device;
1856 	dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1857 
1858 	err = snd_rawmidi_alloc_substreams(rmidi,
1859 					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1860 					   SNDRV_RAWMIDI_STREAM_INPUT,
1861 					   input_count);
1862 	if (err < 0)
1863 		goto error;
1864 	err = snd_rawmidi_alloc_substreams(rmidi,
1865 					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1866 					   SNDRV_RAWMIDI_STREAM_OUTPUT,
1867 					   output_count);
1868 	if (err < 0)
1869 		goto error;
1870 	err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1871 	if (err < 0)
1872 		goto error;
1873 
1874 	if (rrawmidi)
1875 		*rrawmidi = rmidi;
1876 	return 0;
1877 
1878  error:
1879 	snd_rawmidi_free(rmidi);
1880 	return err;
1881 }
1882 EXPORT_SYMBOL(snd_rawmidi_new);
1883 
snd_rawmidi_free_substreams(struct snd_rawmidi_str * stream)1884 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1885 {
1886 	struct snd_rawmidi_substream *substream;
1887 
1888 	while (!list_empty(&stream->substreams)) {
1889 		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1890 		list_del(&substream->list);
1891 		kfree(substream);
1892 	}
1893 }
1894 
snd_rawmidi_free(struct snd_rawmidi * rmidi)1895 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1896 {
1897 	if (!rmidi)
1898 		return 0;
1899 
1900 	snd_info_free_entry(rmidi->proc_entry);
1901 	rmidi->proc_entry = NULL;
1902 	if (rmidi->ops && rmidi->ops->dev_unregister)
1903 		rmidi->ops->dev_unregister(rmidi);
1904 
1905 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1906 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1907 	if (rmidi->private_free)
1908 		rmidi->private_free(rmidi);
1909 	put_device(&rmidi->dev);
1910 	return 0;
1911 }
1912 
snd_rawmidi_dev_free(struct snd_device * device)1913 static int snd_rawmidi_dev_free(struct snd_device *device)
1914 {
1915 	struct snd_rawmidi *rmidi = device->device_data;
1916 
1917 	return snd_rawmidi_free(rmidi);
1918 }
1919 
1920 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
snd_rawmidi_dev_seq_free(struct snd_seq_device * device)1921 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1922 {
1923 	struct snd_rawmidi *rmidi = device->private_data;
1924 
1925 	rmidi->seq_dev = NULL;
1926 }
1927 #endif
1928 
snd_rawmidi_dev_register(struct snd_device * device)1929 static int snd_rawmidi_dev_register(struct snd_device *device)
1930 {
1931 	int err;
1932 	struct snd_info_entry *entry;
1933 	char name[16];
1934 	struct snd_rawmidi *rmidi = device->device_data;
1935 
1936 	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1937 		return -ENOMEM;
1938 	err = 0;
1939 	mutex_lock(&register_mutex);
1940 	if (snd_rawmidi_search(rmidi->card, rmidi->device))
1941 		err = -EBUSY;
1942 	else
1943 		list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1944 	mutex_unlock(&register_mutex);
1945 	if (err < 0)
1946 		return err;
1947 
1948 	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1949 				  rmidi->card, rmidi->device,
1950 				  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1951 	if (err < 0) {
1952 		rmidi_err(rmidi, "unable to register\n");
1953 		goto error;
1954 	}
1955 	if (rmidi->ops && rmidi->ops->dev_register) {
1956 		err = rmidi->ops->dev_register(rmidi);
1957 		if (err < 0)
1958 			goto error_unregister;
1959 	}
1960 #ifdef CONFIG_SND_OSSEMUL
1961 	rmidi->ossreg = 0;
1962 	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1963 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1964 					    rmidi->card, 0, &snd_rawmidi_f_ops,
1965 					    rmidi) < 0) {
1966 			rmidi_err(rmidi,
1967 				  "unable to register OSS rawmidi device %i:%i\n",
1968 				  rmidi->card->number, 0);
1969 		} else {
1970 			rmidi->ossreg++;
1971 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1972 			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1973 #endif
1974 		}
1975 	}
1976 	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1977 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1978 					    rmidi->card, 1, &snd_rawmidi_f_ops,
1979 					    rmidi) < 0) {
1980 			rmidi_err(rmidi,
1981 				  "unable to register OSS rawmidi device %i:%i\n",
1982 				  rmidi->card->number, 1);
1983 		} else {
1984 			rmidi->ossreg++;
1985 		}
1986 	}
1987 #endif /* CONFIG_SND_OSSEMUL */
1988 	sprintf(name, "midi%d", rmidi->device);
1989 	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1990 	if (entry) {
1991 		entry->private_data = rmidi;
1992 		entry->c.text.read = snd_rawmidi_proc_info_read;
1993 		if (snd_info_register(entry) < 0) {
1994 			snd_info_free_entry(entry);
1995 			entry = NULL;
1996 		}
1997 	}
1998 	rmidi->proc_entry = entry;
1999 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
2000 	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
2001 		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2002 			rmidi->seq_dev->private_data = rmidi;
2003 			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2004 			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2005 			snd_device_register(rmidi->card, rmidi->seq_dev);
2006 		}
2007 	}
2008 #endif
2009 	return 0;
2010 
2011  error_unregister:
2012 	snd_unregister_device(&rmidi->dev);
2013  error:
2014 	mutex_lock(&register_mutex);
2015 	list_del(&rmidi->list);
2016 	mutex_unlock(&register_mutex);
2017 	return err;
2018 }
2019 
snd_rawmidi_dev_disconnect(struct snd_device * device)2020 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2021 {
2022 	struct snd_rawmidi *rmidi = device->device_data;
2023 	int dir;
2024 
2025 	mutex_lock(&register_mutex);
2026 	mutex_lock(&rmidi->open_mutex);
2027 	wake_up(&rmidi->open_wait);
2028 	list_del_init(&rmidi->list);
2029 	for (dir = 0; dir < 2; dir++) {
2030 		struct snd_rawmidi_substream *s;
2031 
2032 		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2033 			if (s->runtime)
2034 				wake_up(&s->runtime->sleep);
2035 		}
2036 	}
2037 
2038 #ifdef CONFIG_SND_OSSEMUL
2039 	if (rmidi->ossreg) {
2040 		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2041 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2042 #ifdef SNDRV_OSS_INFO_DEV_MIDI
2043 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2044 #endif
2045 		}
2046 		if ((int)rmidi->device == amidi_map[rmidi->card->number])
2047 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2048 		rmidi->ossreg = 0;
2049 	}
2050 #endif /* CONFIG_SND_OSSEMUL */
2051 	snd_unregister_device(&rmidi->dev);
2052 	mutex_unlock(&rmidi->open_mutex);
2053 	mutex_unlock(&register_mutex);
2054 	return 0;
2055 }
2056 
2057 /**
2058  * snd_rawmidi_set_ops - set the rawmidi operators
2059  * @rmidi: the rawmidi instance
2060  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2061  * @ops: the operator table
2062  *
2063  * Sets the rawmidi operators for the given stream direction.
2064  */
snd_rawmidi_set_ops(struct snd_rawmidi * rmidi,int stream,const struct snd_rawmidi_ops * ops)2065 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2066 			 const struct snd_rawmidi_ops *ops)
2067 {
2068 	struct snd_rawmidi_substream *substream;
2069 
2070 	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2071 		substream->ops = ops;
2072 }
2073 EXPORT_SYMBOL(snd_rawmidi_set_ops);
2074 
2075 /*
2076  *  ENTRY functions
2077  */
2078 
alsa_rawmidi_init(void)2079 static int __init alsa_rawmidi_init(void)
2080 {
2081 
2082 	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2083 	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2084 #ifdef CONFIG_SND_OSSEMUL
2085 	{ int i;
2086 	/* check device map table */
2087 	for (i = 0; i < SNDRV_CARDS; i++) {
2088 		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2089 			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2090 			       i, midi_map[i]);
2091 			midi_map[i] = 0;
2092 		}
2093 		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2094 			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2095 			       i, amidi_map[i]);
2096 			amidi_map[i] = 1;
2097 		}
2098 	}
2099 	}
2100 #endif /* CONFIG_SND_OSSEMUL */
2101 	return 0;
2102 }
2103 
alsa_rawmidi_exit(void)2104 static void __exit alsa_rawmidi_exit(void)
2105 {
2106 	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2107 	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2108 }
2109 
2110 module_init(alsa_rawmidi_init)
2111 module_exit(alsa_rawmidi_exit)
2112