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 #include <sound/ump.h>
25 
26 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
27 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
28 MODULE_LICENSE("GPL");
29 
30 #ifdef CONFIG_SND_OSSEMUL
31 static int midi_map[SNDRV_CARDS];
32 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
33 module_param_array(midi_map, int, NULL, 0444);
34 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
35 module_param_array(amidi_map, int, NULL, 0444);
36 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
37 #endif /* CONFIG_SND_OSSEMUL */
38 
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 
76 #define rawmidi_is_ump(rmidi) \
77 	(IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))
78 
snd_rawmidi_search(struct snd_card * card,int device)79 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
80 {
81 	struct snd_rawmidi *rawmidi;
82 
83 	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
84 		if (rawmidi->card == card && rawmidi->device == device)
85 			return rawmidi;
86 	return NULL;
87 }
88 
snd_rawmidi_file_flags(struct file * file)89 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
90 {
91 	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
92 	case FMODE_WRITE:
93 		return SNDRV_RAWMIDI_LFLG_OUTPUT;
94 	case FMODE_READ:
95 		return SNDRV_RAWMIDI_LFLG_INPUT;
96 	default:
97 		return SNDRV_RAWMIDI_LFLG_OPEN;
98 	}
99 }
100 
__snd_rawmidi_ready(struct snd_rawmidi_runtime * runtime)101 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
102 {
103 	return runtime->avail >= runtime->avail_min;
104 }
105 
snd_rawmidi_ready(struct snd_rawmidi_substream * substream)106 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
107 {
108 	unsigned long flags;
109 	bool ready;
110 
111 	spin_lock_irqsave(&substream->lock, flags);
112 	ready = __snd_rawmidi_ready(substream->runtime);
113 	spin_unlock_irqrestore(&substream->lock, flags);
114 	return ready;
115 }
116 
snd_rawmidi_ready_append(struct snd_rawmidi_substream * substream,size_t count)117 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
118 					   size_t count)
119 {
120 	struct snd_rawmidi_runtime *runtime = substream->runtime;
121 
122 	return runtime->avail >= runtime->avail_min &&
123 	       (!substream->append || runtime->avail >= count);
124 }
125 
snd_rawmidi_input_event_work(struct work_struct * work)126 static void snd_rawmidi_input_event_work(struct work_struct *work)
127 {
128 	struct snd_rawmidi_runtime *runtime =
129 		container_of(work, struct snd_rawmidi_runtime, event_work);
130 
131 	if (runtime->event)
132 		runtime->event(runtime->substream);
133 }
134 
135 /* buffer refcount management: call with substream->lock held */
snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime * runtime)136 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
137 {
138 	runtime->buffer_ref++;
139 }
140 
snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime * runtime)141 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
142 {
143 	runtime->buffer_ref--;
144 }
145 
snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream * substream)146 static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
147 {
148 	int loop = HZ;
149 
150 	spin_lock_irq(&substream->lock);
151 	while (substream->runtime->buffer_ref) {
152 		spin_unlock_irq(&substream->lock);
153 		if (!--loop) {
154 			rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
155 			return;
156 		}
157 		schedule_timeout_uninterruptible(1);
158 		spin_lock_irq(&substream->lock);
159 	}
160 	spin_unlock_irq(&substream->lock);
161 }
162 
snd_rawmidi_runtime_create(struct snd_rawmidi_substream * substream)163 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
164 {
165 	struct snd_rawmidi_runtime *runtime;
166 
167 	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
168 	if (!runtime)
169 		return -ENOMEM;
170 	runtime->substream = substream;
171 	init_waitqueue_head(&runtime->sleep);
172 	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
173 	runtime->event = NULL;
174 	runtime->buffer_size = PAGE_SIZE;
175 	runtime->avail_min = 1;
176 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
177 		runtime->avail = 0;
178 	else
179 		runtime->avail = runtime->buffer_size;
180 	runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
181 	if (!runtime->buffer) {
182 		kfree(runtime);
183 		return -ENOMEM;
184 	}
185 	runtime->appl_ptr = runtime->hw_ptr = 0;
186 	substream->runtime = runtime;
187 	if (rawmidi_is_ump(substream->rmidi))
188 		runtime->align = 3;
189 	return 0;
190 }
191 
192 /* get the current alignment (either 0 or 3) */
get_align(struct snd_rawmidi_runtime * runtime)193 static inline int get_align(struct snd_rawmidi_runtime *runtime)
194 {
195 	if (IS_ENABLED(CONFIG_SND_UMP))
196 		return runtime->align;
197 	else
198 		return 0;
199 }
200 
201 /* get the trimmed size with the current alignment */
202 #define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
203 
snd_rawmidi_runtime_free(struct snd_rawmidi_substream * substream)204 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
205 {
206 	struct snd_rawmidi_runtime *runtime = substream->runtime;
207 
208 	kvfree(runtime->buffer);
209 	kfree(runtime);
210 	substream->runtime = NULL;
211 	return 0;
212 }
213 
snd_rawmidi_output_trigger(struct snd_rawmidi_substream * substream,int up)214 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
215 {
216 	if (!substream->opened)
217 		return;
218 	substream->ops->trigger(substream, up);
219 }
220 
snd_rawmidi_input_trigger(struct snd_rawmidi_substream * substream,int up)221 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
222 {
223 	if (!substream->opened)
224 		return;
225 	substream->ops->trigger(substream, up);
226 	if (!up)
227 		cancel_work_sync(&substream->runtime->event_work);
228 }
229 
__reset_runtime_ptrs(struct snd_rawmidi_runtime * runtime,bool is_input)230 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
231 				 bool is_input)
232 {
233 	runtime->drain = 0;
234 	runtime->appl_ptr = runtime->hw_ptr = 0;
235 	runtime->avail = is_input ? 0 : runtime->buffer_size;
236 }
237 
reset_runtime_ptrs(struct snd_rawmidi_substream * substream,bool is_input)238 static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
239 			       bool is_input)
240 {
241 	unsigned long flags;
242 
243 	spin_lock_irqsave(&substream->lock, flags);
244 	if (substream->opened && substream->runtime)
245 		__reset_runtime_ptrs(substream->runtime, is_input);
246 	spin_unlock_irqrestore(&substream->lock, flags);
247 }
248 
snd_rawmidi_drop_output(struct snd_rawmidi_substream * substream)249 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
250 {
251 	snd_rawmidi_output_trigger(substream, 0);
252 	reset_runtime_ptrs(substream, false);
253 	return 0;
254 }
255 EXPORT_SYMBOL(snd_rawmidi_drop_output);
256 
snd_rawmidi_drain_output(struct snd_rawmidi_substream * substream)257 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
258 {
259 	int err = 0;
260 	long timeout;
261 	struct snd_rawmidi_runtime *runtime;
262 
263 	spin_lock_irq(&substream->lock);
264 	runtime = substream->runtime;
265 	if (!substream->opened || !runtime || !runtime->buffer) {
266 		err = -EINVAL;
267 	} else {
268 		snd_rawmidi_buffer_ref(runtime);
269 		runtime->drain = 1;
270 	}
271 	spin_unlock_irq(&substream->lock);
272 	if (err < 0)
273 		return err;
274 
275 	timeout = wait_event_interruptible_timeout(runtime->sleep,
276 				(runtime->avail >= runtime->buffer_size),
277 				10*HZ);
278 
279 	spin_lock_irq(&substream->lock);
280 	if (signal_pending(current))
281 		err = -ERESTARTSYS;
282 	if (runtime->avail < runtime->buffer_size && !timeout) {
283 		rmidi_warn(substream->rmidi,
284 			   "rawmidi drain error (avail = %li, buffer_size = %li)\n",
285 			   (long)runtime->avail, (long)runtime->buffer_size);
286 		err = -EIO;
287 	}
288 	runtime->drain = 0;
289 	spin_unlock_irq(&substream->lock);
290 
291 	if (err != -ERESTARTSYS) {
292 		/* we need wait a while to make sure that Tx FIFOs are empty */
293 		if (substream->ops->drain)
294 			substream->ops->drain(substream);
295 		else
296 			msleep(50);
297 		snd_rawmidi_drop_output(substream);
298 	}
299 
300 	spin_lock_irq(&substream->lock);
301 	snd_rawmidi_buffer_unref(runtime);
302 	spin_unlock_irq(&substream->lock);
303 
304 	return err;
305 }
306 EXPORT_SYMBOL(snd_rawmidi_drain_output);
307 
snd_rawmidi_drain_input(struct snd_rawmidi_substream * substream)308 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
309 {
310 	snd_rawmidi_input_trigger(substream, 0);
311 	reset_runtime_ptrs(substream, true);
312 	return 0;
313 }
314 EXPORT_SYMBOL(snd_rawmidi_drain_input);
315 
316 /* look for an available substream for the given stream direction;
317  * if a specific subdevice is given, try to assign it
318  */
assign_substream(struct snd_rawmidi * rmidi,int subdevice,int stream,int mode,struct snd_rawmidi_substream ** sub_ret)319 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
320 			    int stream, int mode,
321 			    struct snd_rawmidi_substream **sub_ret)
322 {
323 	struct snd_rawmidi_substream *substream;
324 	struct snd_rawmidi_str *s = &rmidi->streams[stream];
325 	static const unsigned int info_flags[2] = {
326 		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
327 		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
328 	};
329 
330 	if (!(rmidi->info_flags & info_flags[stream]))
331 		return -ENXIO;
332 	if (subdevice >= 0 && subdevice >= s->substream_count)
333 		return -ENODEV;
334 
335 	list_for_each_entry(substream, &s->substreams, list) {
336 		if (substream->opened) {
337 			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
338 			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
339 			    !substream->append)
340 				continue;
341 		}
342 		if (subdevice < 0 || subdevice == substream->number) {
343 			*sub_ret = substream;
344 			return 0;
345 		}
346 	}
347 	return -EAGAIN;
348 }
349 
350 /* open and do ref-counting for the given substream */
open_substream(struct snd_rawmidi * rmidi,struct snd_rawmidi_substream * substream,int mode)351 static int open_substream(struct snd_rawmidi *rmidi,
352 			  struct snd_rawmidi_substream *substream,
353 			  int mode)
354 {
355 	int err;
356 
357 	if (substream->use_count == 0) {
358 		err = snd_rawmidi_runtime_create(substream);
359 		if (err < 0)
360 			return err;
361 		err = substream->ops->open(substream);
362 		if (err < 0) {
363 			snd_rawmidi_runtime_free(substream);
364 			return err;
365 		}
366 		spin_lock_irq(&substream->lock);
367 		substream->opened = 1;
368 		substream->active_sensing = 0;
369 		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
370 			substream->append = 1;
371 		substream->pid = get_pid(task_pid(current));
372 		rmidi->streams[substream->stream].substream_opened++;
373 		spin_unlock_irq(&substream->lock);
374 	}
375 	substream->use_count++;
376 	return 0;
377 }
378 
379 static void close_substream(struct snd_rawmidi *rmidi,
380 			    struct snd_rawmidi_substream *substream,
381 			    int cleanup);
382 
rawmidi_open_priv(struct snd_rawmidi * rmidi,int subdevice,int mode,struct snd_rawmidi_file * rfile)383 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
384 			     struct snd_rawmidi_file *rfile)
385 {
386 	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
387 	int err;
388 
389 	rfile->input = rfile->output = NULL;
390 	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
391 		err = assign_substream(rmidi, subdevice,
392 				       SNDRV_RAWMIDI_STREAM_INPUT,
393 				       mode, &sinput);
394 		if (err < 0)
395 			return err;
396 	}
397 	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
398 		err = assign_substream(rmidi, subdevice,
399 				       SNDRV_RAWMIDI_STREAM_OUTPUT,
400 				       mode, &soutput);
401 		if (err < 0)
402 			return err;
403 	}
404 
405 	if (sinput) {
406 		err = open_substream(rmidi, sinput, mode);
407 		if (err < 0)
408 			return err;
409 	}
410 	if (soutput) {
411 		err = open_substream(rmidi, soutput, mode);
412 		if (err < 0) {
413 			if (sinput)
414 				close_substream(rmidi, sinput, 0);
415 			return err;
416 		}
417 	}
418 
419 	rfile->rmidi = rmidi;
420 	rfile->input = sinput;
421 	rfile->output = soutput;
422 	return 0;
423 }
424 
425 /* called from sound/core/seq/seq_midi.c */
snd_rawmidi_kernel_open(struct snd_rawmidi * rmidi,int subdevice,int mode,struct snd_rawmidi_file * rfile)426 int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
427 			    int mode, struct snd_rawmidi_file *rfile)
428 {
429 	int err;
430 
431 	if (snd_BUG_ON(!rfile))
432 		return -EINVAL;
433 	if (!try_module_get(rmidi->card->module))
434 		return -ENXIO;
435 
436 	mutex_lock(&rmidi->open_mutex);
437 	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
438 	mutex_unlock(&rmidi->open_mutex);
439 	if (err < 0)
440 		module_put(rmidi->card->module);
441 	return err;
442 }
443 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
444 
snd_rawmidi_open(struct inode * inode,struct file * file)445 static int snd_rawmidi_open(struct inode *inode, struct file *file)
446 {
447 	int maj = imajor(inode);
448 	struct snd_card *card;
449 	int subdevice;
450 	unsigned short fflags;
451 	int err;
452 	struct snd_rawmidi *rmidi;
453 	struct snd_rawmidi_file *rawmidi_file = NULL;
454 	wait_queue_entry_t wait;
455 
456 	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
457 		return -EINVAL;		/* invalid combination */
458 
459 	err = stream_open(inode, file);
460 	if (err < 0)
461 		return err;
462 
463 	if (maj == snd_major) {
464 		rmidi = snd_lookup_minor_data(iminor(inode),
465 					      SNDRV_DEVICE_TYPE_RAWMIDI);
466 #ifdef CONFIG_SND_OSSEMUL
467 	} else if (maj == SOUND_MAJOR) {
468 		rmidi = snd_lookup_oss_minor_data(iminor(inode),
469 						  SNDRV_OSS_DEVICE_TYPE_MIDI);
470 #endif
471 	} else
472 		return -ENXIO;
473 
474 	if (rmidi == NULL)
475 		return -ENODEV;
476 
477 	if (!try_module_get(rmidi->card->module)) {
478 		snd_card_unref(rmidi->card);
479 		return -ENXIO;
480 	}
481 
482 	mutex_lock(&rmidi->open_mutex);
483 	card = rmidi->card;
484 	err = snd_card_file_add(card, file);
485 	if (err < 0)
486 		goto __error_card;
487 	fflags = snd_rawmidi_file_flags(file);
488 	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
489 		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
490 	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
491 	if (rawmidi_file == NULL) {
492 		err = -ENOMEM;
493 		goto __error;
494 	}
495 	rawmidi_file->user_pversion = 0;
496 	init_waitqueue_entry(&wait, current);
497 	add_wait_queue(&rmidi->open_wait, &wait);
498 	while (1) {
499 		subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
500 		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
501 		if (err >= 0)
502 			break;
503 		if (err == -EAGAIN) {
504 			if (file->f_flags & O_NONBLOCK) {
505 				err = -EBUSY;
506 				break;
507 			}
508 		} else
509 			break;
510 		set_current_state(TASK_INTERRUPTIBLE);
511 		mutex_unlock(&rmidi->open_mutex);
512 		schedule();
513 		mutex_lock(&rmidi->open_mutex);
514 		if (rmidi->card->shutdown) {
515 			err = -ENODEV;
516 			break;
517 		}
518 		if (signal_pending(current)) {
519 			err = -ERESTARTSYS;
520 			break;
521 		}
522 	}
523 	remove_wait_queue(&rmidi->open_wait, &wait);
524 	if (err < 0) {
525 		kfree(rawmidi_file);
526 		goto __error;
527 	}
528 #ifdef CONFIG_SND_OSSEMUL
529 	if (rawmidi_file->input && rawmidi_file->input->runtime)
530 		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
531 	if (rawmidi_file->output && rawmidi_file->output->runtime)
532 		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
533 #endif
534 	file->private_data = rawmidi_file;
535 	mutex_unlock(&rmidi->open_mutex);
536 	snd_card_unref(rmidi->card);
537 	return 0;
538 
539  __error:
540 	snd_card_file_remove(card, file);
541  __error_card:
542 	mutex_unlock(&rmidi->open_mutex);
543 	module_put(rmidi->card->module);
544 	snd_card_unref(rmidi->card);
545 	return err;
546 }
547 
close_substream(struct snd_rawmidi * rmidi,struct snd_rawmidi_substream * substream,int cleanup)548 static void close_substream(struct snd_rawmidi *rmidi,
549 			    struct snd_rawmidi_substream *substream,
550 			    int cleanup)
551 {
552 	if (--substream->use_count)
553 		return;
554 
555 	if (cleanup) {
556 		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
557 			snd_rawmidi_input_trigger(substream, 0);
558 		else {
559 			if (substream->active_sensing) {
560 				unsigned char buf = 0xfe;
561 				/* sending single active sensing message
562 				 * to shut the device up
563 				 */
564 				snd_rawmidi_kernel_write(substream, &buf, 1);
565 			}
566 			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
567 				snd_rawmidi_output_trigger(substream, 0);
568 		}
569 		snd_rawmidi_buffer_ref_sync(substream);
570 	}
571 	spin_lock_irq(&substream->lock);
572 	substream->opened = 0;
573 	substream->append = 0;
574 	spin_unlock_irq(&substream->lock);
575 	substream->ops->close(substream);
576 	if (substream->runtime->private_free)
577 		substream->runtime->private_free(substream);
578 	snd_rawmidi_runtime_free(substream);
579 	put_pid(substream->pid);
580 	substream->pid = NULL;
581 	rmidi->streams[substream->stream].substream_opened--;
582 }
583 
rawmidi_release_priv(struct snd_rawmidi_file * rfile)584 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
585 {
586 	struct snd_rawmidi *rmidi;
587 
588 	rmidi = rfile->rmidi;
589 	mutex_lock(&rmidi->open_mutex);
590 	if (rfile->input) {
591 		close_substream(rmidi, rfile->input, 1);
592 		rfile->input = NULL;
593 	}
594 	if (rfile->output) {
595 		close_substream(rmidi, rfile->output, 1);
596 		rfile->output = NULL;
597 	}
598 	rfile->rmidi = NULL;
599 	mutex_unlock(&rmidi->open_mutex);
600 	wake_up(&rmidi->open_wait);
601 }
602 
603 /* called from sound/core/seq/seq_midi.c */
snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)604 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
605 {
606 	struct snd_rawmidi *rmidi;
607 
608 	if (snd_BUG_ON(!rfile))
609 		return -ENXIO;
610 
611 	rmidi = rfile->rmidi;
612 	rawmidi_release_priv(rfile);
613 	module_put(rmidi->card->module);
614 	return 0;
615 }
616 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
617 
snd_rawmidi_release(struct inode * inode,struct file * file)618 static int snd_rawmidi_release(struct inode *inode, struct file *file)
619 {
620 	struct snd_rawmidi_file *rfile;
621 	struct snd_rawmidi *rmidi;
622 	struct module *module;
623 
624 	rfile = file->private_data;
625 	rmidi = rfile->rmidi;
626 	rawmidi_release_priv(rfile);
627 	kfree(rfile);
628 	module = rmidi->card->module;
629 	snd_card_file_remove(rmidi->card, file);
630 	module_put(module);
631 	return 0;
632 }
633 
snd_rawmidi_info(struct snd_rawmidi_substream * substream,struct snd_rawmidi_info * info)634 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
635 			    struct snd_rawmidi_info *info)
636 {
637 	struct snd_rawmidi *rmidi;
638 
639 	if (substream == NULL)
640 		return -ENODEV;
641 	rmidi = substream->rmidi;
642 	memset(info, 0, sizeof(*info));
643 	info->card = rmidi->card->number;
644 	info->device = rmidi->device;
645 	info->subdevice = substream->number;
646 	info->stream = substream->stream;
647 	info->flags = rmidi->info_flags;
648 	strcpy(info->id, rmidi->id);
649 	strcpy(info->name, rmidi->name);
650 	strcpy(info->subname, substream->name);
651 	info->subdevices_count = substream->pstr->substream_count;
652 	info->subdevices_avail = (substream->pstr->substream_count -
653 				  substream->pstr->substream_opened);
654 	return 0;
655 }
656 
snd_rawmidi_info_user(struct snd_rawmidi_substream * substream,struct snd_rawmidi_info __user * _info)657 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
658 				 struct snd_rawmidi_info __user *_info)
659 {
660 	struct snd_rawmidi_info info;
661 	int err;
662 
663 	err = snd_rawmidi_info(substream, &info);
664 	if (err < 0)
665 		return err;
666 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
667 		return -EFAULT;
668 	return 0;
669 }
670 
__snd_rawmidi_info_select(struct snd_card * card,struct snd_rawmidi_info * info)671 static int __snd_rawmidi_info_select(struct snd_card *card,
672 				     struct snd_rawmidi_info *info)
673 {
674 	struct snd_rawmidi *rmidi;
675 	struct snd_rawmidi_str *pstr;
676 	struct snd_rawmidi_substream *substream;
677 
678 	rmidi = snd_rawmidi_search(card, info->device);
679 	if (!rmidi)
680 		return -ENXIO;
681 	if (info->stream < 0 || info->stream > 1)
682 		return -EINVAL;
683 	info->stream = array_index_nospec(info->stream, 2);
684 	pstr = &rmidi->streams[info->stream];
685 	if (pstr->substream_count == 0)
686 		return -ENOENT;
687 	if (info->subdevice >= pstr->substream_count)
688 		return -ENXIO;
689 	list_for_each_entry(substream, &pstr->substreams, list) {
690 		if ((unsigned int)substream->number == info->subdevice)
691 			return snd_rawmidi_info(substream, info);
692 	}
693 	return -ENXIO;
694 }
695 
snd_rawmidi_info_select(struct snd_card * card,struct snd_rawmidi_info * info)696 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
697 {
698 	int ret;
699 
700 	mutex_lock(&register_mutex);
701 	ret = __snd_rawmidi_info_select(card, info);
702 	mutex_unlock(&register_mutex);
703 	return ret;
704 }
705 EXPORT_SYMBOL(snd_rawmidi_info_select);
706 
snd_rawmidi_info_select_user(struct snd_card * card,struct snd_rawmidi_info __user * _info)707 static int snd_rawmidi_info_select_user(struct snd_card *card,
708 					struct snd_rawmidi_info __user *_info)
709 {
710 	int err;
711 	struct snd_rawmidi_info info;
712 
713 	if (get_user(info.device, &_info->device))
714 		return -EFAULT;
715 	if (get_user(info.stream, &_info->stream))
716 		return -EFAULT;
717 	if (get_user(info.subdevice, &_info->subdevice))
718 		return -EFAULT;
719 	err = snd_rawmidi_info_select(card, &info);
720 	if (err < 0)
721 		return err;
722 	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
723 		return -EFAULT;
724 	return 0;
725 }
726 
resize_runtime_buffer(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params,bool is_input)727 static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
728 				 struct snd_rawmidi_params *params,
729 				 bool is_input)
730 {
731 	struct snd_rawmidi_runtime *runtime = substream->runtime;
732 	char *newbuf, *oldbuf;
733 	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
734 
735 	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
736 		return -EINVAL;
737 	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
738 		return -EINVAL;
739 	if (params->avail_min < 1 || params->avail_min > params->buffer_size)
740 		return -EINVAL;
741 	if (params->buffer_size & get_align(runtime))
742 		return -EINVAL;
743 	if (params->buffer_size != runtime->buffer_size) {
744 		newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
745 		if (!newbuf)
746 			return -ENOMEM;
747 		spin_lock_irq(&substream->lock);
748 		if (runtime->buffer_ref) {
749 			spin_unlock_irq(&substream->lock);
750 			kvfree(newbuf);
751 			return -EBUSY;
752 		}
753 		oldbuf = runtime->buffer;
754 		runtime->buffer = newbuf;
755 		runtime->buffer_size = params->buffer_size;
756 		__reset_runtime_ptrs(runtime, is_input);
757 		spin_unlock_irq(&substream->lock);
758 		kvfree(oldbuf);
759 	}
760 	runtime->avail_min = params->avail_min;
761 	return 0;
762 }
763 
snd_rawmidi_output_params(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params)764 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
765 			      struct snd_rawmidi_params *params)
766 {
767 	int err;
768 
769 	snd_rawmidi_drain_output(substream);
770 	mutex_lock(&substream->rmidi->open_mutex);
771 	if (substream->append && substream->use_count > 1)
772 		err = -EBUSY;
773 	else
774 		err = resize_runtime_buffer(substream, params, false);
775 
776 	if (!err)
777 		substream->active_sensing = !params->no_active_sensing;
778 	mutex_unlock(&substream->rmidi->open_mutex);
779 	return err;
780 }
781 EXPORT_SYMBOL(snd_rawmidi_output_params);
782 
snd_rawmidi_input_params(struct snd_rawmidi_substream * substream,struct snd_rawmidi_params * params)783 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
784 			     struct snd_rawmidi_params *params)
785 {
786 	unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
787 	unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
788 	int err;
789 
790 	snd_rawmidi_drain_input(substream);
791 	mutex_lock(&substream->rmidi->open_mutex);
792 	if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
793 		err = -EINVAL;
794 	else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
795 		err = -EINVAL;
796 	else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
797 		err = -EINVAL;
798 	else
799 		err = resize_runtime_buffer(substream, params, true);
800 
801 	if (!err) {
802 		substream->framing = framing;
803 		substream->clock_type = clock_type;
804 	}
805 	mutex_unlock(&substream->rmidi->open_mutex);
806 	return 0;
807 }
808 EXPORT_SYMBOL(snd_rawmidi_input_params);
809 
snd_rawmidi_output_status(struct snd_rawmidi_substream * substream,struct snd_rawmidi_status64 * status)810 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
811 				     struct snd_rawmidi_status64 *status)
812 {
813 	struct snd_rawmidi_runtime *runtime = substream->runtime;
814 
815 	memset(status, 0, sizeof(*status));
816 	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
817 	spin_lock_irq(&substream->lock);
818 	status->avail = runtime->avail;
819 	spin_unlock_irq(&substream->lock);
820 	return 0;
821 }
822 
snd_rawmidi_input_status(struct snd_rawmidi_substream * substream,struct snd_rawmidi_status64 * status)823 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
824 				    struct snd_rawmidi_status64 *status)
825 {
826 	struct snd_rawmidi_runtime *runtime = substream->runtime;
827 
828 	memset(status, 0, sizeof(*status));
829 	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
830 	spin_lock_irq(&substream->lock);
831 	status->avail = runtime->avail;
832 	status->xruns = runtime->xruns;
833 	runtime->xruns = 0;
834 	spin_unlock_irq(&substream->lock);
835 	return 0;
836 }
837 
snd_rawmidi_ioctl_status32(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status32 __user * argp)838 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
839 				      struct snd_rawmidi_status32 __user *argp)
840 {
841 	int err = 0;
842 	struct snd_rawmidi_status32 __user *status = argp;
843 	struct snd_rawmidi_status32 status32;
844 	struct snd_rawmidi_status64 status64;
845 
846 	if (copy_from_user(&status32, argp,
847 			   sizeof(struct snd_rawmidi_status32)))
848 		return -EFAULT;
849 
850 	switch (status32.stream) {
851 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
852 		if (rfile->output == NULL)
853 			return -EINVAL;
854 		err = snd_rawmidi_output_status(rfile->output, &status64);
855 		break;
856 	case SNDRV_RAWMIDI_STREAM_INPUT:
857 		if (rfile->input == NULL)
858 			return -EINVAL;
859 		err = snd_rawmidi_input_status(rfile->input, &status64);
860 		break;
861 	default:
862 		return -EINVAL;
863 	}
864 	if (err < 0)
865 		return err;
866 
867 	status32 = (struct snd_rawmidi_status32) {
868 		.stream = status64.stream,
869 		.tstamp_sec = status64.tstamp_sec,
870 		.tstamp_nsec = status64.tstamp_nsec,
871 		.avail = status64.avail,
872 		.xruns = status64.xruns,
873 	};
874 
875 	if (copy_to_user(status, &status32, sizeof(*status)))
876 		return -EFAULT;
877 
878 	return 0;
879 }
880 
snd_rawmidi_ioctl_status64(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status64 __user * argp)881 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
882 				      struct snd_rawmidi_status64 __user *argp)
883 {
884 	int err = 0;
885 	struct snd_rawmidi_status64 status;
886 
887 	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
888 		return -EFAULT;
889 
890 	switch (status.stream) {
891 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
892 		if (rfile->output == NULL)
893 			return -EINVAL;
894 		err = snd_rawmidi_output_status(rfile->output, &status);
895 		break;
896 	case SNDRV_RAWMIDI_STREAM_INPUT:
897 		if (rfile->input == NULL)
898 			return -EINVAL;
899 		err = snd_rawmidi_input_status(rfile->input, &status);
900 		break;
901 	default:
902 		return -EINVAL;
903 	}
904 	if (err < 0)
905 		return err;
906 	if (copy_to_user(argp, &status,
907 			 sizeof(struct snd_rawmidi_status64)))
908 		return -EFAULT;
909 	return 0;
910 }
911 
snd_rawmidi_ioctl(struct file * file,unsigned int cmd,unsigned long arg)912 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
913 {
914 	struct snd_rawmidi_file *rfile;
915 	struct snd_rawmidi *rmidi;
916 	void __user *argp = (void __user *)arg;
917 
918 	rfile = file->private_data;
919 	if (((cmd >> 8) & 0xff) != 'W')
920 		return -ENOTTY;
921 	switch (cmd) {
922 	case SNDRV_RAWMIDI_IOCTL_PVERSION:
923 		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
924 	case SNDRV_RAWMIDI_IOCTL_INFO:
925 	{
926 		int stream;
927 		struct snd_rawmidi_info __user *info = argp;
928 
929 		if (get_user(stream, &info->stream))
930 			return -EFAULT;
931 		switch (stream) {
932 		case SNDRV_RAWMIDI_STREAM_INPUT:
933 			return snd_rawmidi_info_user(rfile->input, info);
934 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
935 			return snd_rawmidi_info_user(rfile->output, info);
936 		default:
937 			return -EINVAL;
938 		}
939 	}
940 	case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
941 		if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
942 			return -EFAULT;
943 		return 0;
944 
945 	case SNDRV_RAWMIDI_IOCTL_PARAMS:
946 	{
947 		struct snd_rawmidi_params params;
948 
949 		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
950 			return -EFAULT;
951 		if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
952 			params.mode = 0;
953 			memset(params.reserved, 0, sizeof(params.reserved));
954 		}
955 		switch (params.stream) {
956 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
957 			if (rfile->output == NULL)
958 				return -EINVAL;
959 			return snd_rawmidi_output_params(rfile->output, &params);
960 		case SNDRV_RAWMIDI_STREAM_INPUT:
961 			if (rfile->input == NULL)
962 				return -EINVAL;
963 			return snd_rawmidi_input_params(rfile->input, &params);
964 		default:
965 			return -EINVAL;
966 		}
967 	}
968 	case SNDRV_RAWMIDI_IOCTL_STATUS32:
969 		return snd_rawmidi_ioctl_status32(rfile, argp);
970 	case SNDRV_RAWMIDI_IOCTL_STATUS64:
971 		return snd_rawmidi_ioctl_status64(rfile, argp);
972 	case SNDRV_RAWMIDI_IOCTL_DROP:
973 	{
974 		int val;
975 
976 		if (get_user(val, (int __user *) argp))
977 			return -EFAULT;
978 		switch (val) {
979 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
980 			if (rfile->output == NULL)
981 				return -EINVAL;
982 			return snd_rawmidi_drop_output(rfile->output);
983 		default:
984 			return -EINVAL;
985 		}
986 	}
987 	case SNDRV_RAWMIDI_IOCTL_DRAIN:
988 	{
989 		int val;
990 
991 		if (get_user(val, (int __user *) argp))
992 			return -EFAULT;
993 		switch (val) {
994 		case SNDRV_RAWMIDI_STREAM_OUTPUT:
995 			if (rfile->output == NULL)
996 				return -EINVAL;
997 			return snd_rawmidi_drain_output(rfile->output);
998 		case SNDRV_RAWMIDI_STREAM_INPUT:
999 			if (rfile->input == NULL)
1000 				return -EINVAL;
1001 			return snd_rawmidi_drain_input(rfile->input);
1002 		default:
1003 			return -EINVAL;
1004 		}
1005 	}
1006 	default:
1007 		rmidi = rfile->rmidi;
1008 		if (rmidi->ops && rmidi->ops->ioctl)
1009 			return rmidi->ops->ioctl(rmidi, cmd, argp);
1010 		rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
1011 	}
1012 	return -ENOTTY;
1013 }
1014 
1015 /* ioctl to find the next device; either legacy or UMP depending on @find_ump */
snd_rawmidi_next_device(struct snd_card * card,int __user * argp,bool find_ump)1016 static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
1017 				   bool find_ump)
1018 
1019 {
1020 	struct snd_rawmidi *rmidi;
1021 	int device;
1022 	bool is_ump;
1023 
1024 	if (get_user(device, argp))
1025 		return -EFAULT;
1026 	if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1027 		device = SNDRV_RAWMIDI_DEVICES - 1;
1028 	mutex_lock(&register_mutex);
1029 	device = device < 0 ? 0 : device + 1;
1030 	for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1031 		rmidi = snd_rawmidi_search(card, device);
1032 		if (!rmidi)
1033 			continue;
1034 		is_ump = rawmidi_is_ump(rmidi);
1035 		if (find_ump == is_ump)
1036 			break;
1037 	}
1038 	if (device == SNDRV_RAWMIDI_DEVICES)
1039 		device = -1;
1040 	mutex_unlock(&register_mutex);
1041 	if (put_user(device, argp))
1042 		return -EFAULT;
1043 	return 0;
1044 }
1045 
1046 #if IS_ENABLED(CONFIG_SND_UMP)
1047 /* inquiry of UMP endpoint and block info via control API */
snd_rawmidi_call_ump_ioctl(struct snd_card * card,int cmd,void __user * argp)1048 static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1049 				      void __user *argp)
1050 {
1051 	struct snd_ump_endpoint_info __user *info = argp;
1052 	struct snd_rawmidi *rmidi;
1053 	int device, ret;
1054 
1055 	if (get_user(device, &info->device))
1056 		return -EFAULT;
1057 	mutex_lock(&register_mutex);
1058 	rmidi = snd_rawmidi_search(card, device);
1059 	if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1060 		ret = rmidi->ops->ioctl(rmidi, cmd, argp);
1061 	else
1062 		ret = -ENXIO;
1063 	mutex_unlock(&register_mutex);
1064 	return ret;
1065 }
1066 #endif
1067 
snd_rawmidi_control_ioctl(struct snd_card * card,struct snd_ctl_file * control,unsigned int cmd,unsigned long arg)1068 static int snd_rawmidi_control_ioctl(struct snd_card *card,
1069 				     struct snd_ctl_file *control,
1070 				     unsigned int cmd,
1071 				     unsigned long arg)
1072 {
1073 	void __user *argp = (void __user *)arg;
1074 
1075 	switch (cmd) {
1076 	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1077 		return snd_rawmidi_next_device(card, argp, false);
1078 #if IS_ENABLED(CONFIG_SND_UMP)
1079 	case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1080 		return snd_rawmidi_next_device(card, argp, true);
1081 	case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1082 		return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1083 	case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1084 		return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1085 #endif
1086 	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1087 	{
1088 		int val;
1089 
1090 		if (get_user(val, (int __user *)argp))
1091 			return -EFAULT;
1092 		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1093 		return 0;
1094 	}
1095 	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1096 		return snd_rawmidi_info_select_user(card, argp);
1097 	}
1098 	return -ENOIOCTLCMD;
1099 }
1100 
receive_with_tstamp_framing(struct snd_rawmidi_substream * substream,const unsigned char * buffer,int src_count,const struct timespec64 * tstamp)1101 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1102 			const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1103 {
1104 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1105 	struct snd_rawmidi_framing_tstamp *dest_ptr;
1106 	struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1107 	int orig_count = src_count;
1108 	int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1109 	int align = get_align(runtime);
1110 
1111 	BUILD_BUG_ON(frame_size != 0x20);
1112 	if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1113 		return -EINVAL;
1114 
1115 	while (src_count > align) {
1116 		if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1117 			runtime->xruns += src_count;
1118 			break;
1119 		}
1120 		if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1121 			frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1122 		else {
1123 			frame.length = get_aligned_size(runtime, src_count);
1124 			if (!frame.length)
1125 				break;
1126 			memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1127 		}
1128 		memcpy(frame.data, buffer, frame.length);
1129 		buffer += frame.length;
1130 		src_count -= frame.length;
1131 		dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1132 		*dest_ptr = frame;
1133 		runtime->avail += frame_size;
1134 		runtime->hw_ptr += frame_size;
1135 		runtime->hw_ptr %= runtime->buffer_size;
1136 	}
1137 	return orig_count - src_count;
1138 }
1139 
get_framing_tstamp(struct snd_rawmidi_substream * substream)1140 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1141 {
1142 	struct timespec64 ts64 = {0, 0};
1143 
1144 	switch (substream->clock_type) {
1145 	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1146 		ktime_get_raw_ts64(&ts64);
1147 		break;
1148 	case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1149 		ktime_get_ts64(&ts64);
1150 		break;
1151 	case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1152 		ktime_get_real_ts64(&ts64);
1153 		break;
1154 	}
1155 	return ts64;
1156 }
1157 
1158 /**
1159  * snd_rawmidi_receive - receive the input data from the device
1160  * @substream: the rawmidi substream
1161  * @buffer: the buffer pointer
1162  * @count: the data size to read
1163  *
1164  * Reads the data from the internal buffer.
1165  *
1166  * Return: The size of read data, or a negative error code on failure.
1167  */
snd_rawmidi_receive(struct snd_rawmidi_substream * substream,const unsigned char * buffer,int count)1168 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1169 			const unsigned char *buffer, int count)
1170 {
1171 	unsigned long flags;
1172 	struct timespec64 ts64 = get_framing_tstamp(substream);
1173 	int result = 0, count1;
1174 	struct snd_rawmidi_runtime *runtime;
1175 
1176 	spin_lock_irqsave(&substream->lock, flags);
1177 	if (!substream->opened) {
1178 		result = -EBADFD;
1179 		goto unlock;
1180 	}
1181 	runtime = substream->runtime;
1182 	if (!runtime || !runtime->buffer) {
1183 		rmidi_dbg(substream->rmidi,
1184 			  "snd_rawmidi_receive: input is not active!!!\n");
1185 		result = -EINVAL;
1186 		goto unlock;
1187 	}
1188 
1189 	count = get_aligned_size(runtime, count);
1190 	if (!count)
1191 		goto unlock;
1192 
1193 	if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1194 		result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1195 	} else if (count == 1) {	/* special case, faster code */
1196 		substream->bytes++;
1197 		if (runtime->avail < runtime->buffer_size) {
1198 			runtime->buffer[runtime->hw_ptr++] = buffer[0];
1199 			runtime->hw_ptr %= runtime->buffer_size;
1200 			runtime->avail++;
1201 			result++;
1202 		} else {
1203 			runtime->xruns++;
1204 		}
1205 	} else {
1206 		substream->bytes += count;
1207 		count1 = runtime->buffer_size - runtime->hw_ptr;
1208 		if (count1 > count)
1209 			count1 = count;
1210 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1211 			count1 = runtime->buffer_size - runtime->avail;
1212 		count1 = get_aligned_size(runtime, count1);
1213 		if (!count1)
1214 			goto unlock;
1215 		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1216 		runtime->hw_ptr += count1;
1217 		runtime->hw_ptr %= runtime->buffer_size;
1218 		runtime->avail += count1;
1219 		count -= count1;
1220 		result += count1;
1221 		if (count > 0) {
1222 			buffer += count1;
1223 			count1 = count;
1224 			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1225 				count1 = runtime->buffer_size - runtime->avail;
1226 				runtime->xruns += count - count1;
1227 			}
1228 			if (count1 > 0) {
1229 				memcpy(runtime->buffer, buffer, count1);
1230 				runtime->hw_ptr = count1;
1231 				runtime->avail += count1;
1232 				result += count1;
1233 			}
1234 		}
1235 	}
1236 	if (result > 0) {
1237 		if (runtime->event)
1238 			schedule_work(&runtime->event_work);
1239 		else if (__snd_rawmidi_ready(runtime))
1240 			wake_up(&runtime->sleep);
1241 	}
1242  unlock:
1243 	spin_unlock_irqrestore(&substream->lock, flags);
1244 	return result;
1245 }
1246 EXPORT_SYMBOL(snd_rawmidi_receive);
1247 
snd_rawmidi_kernel_read1(struct snd_rawmidi_substream * substream,unsigned char __user * userbuf,unsigned char * kernelbuf,long count)1248 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1249 				     unsigned char __user *userbuf,
1250 				     unsigned char *kernelbuf, long count)
1251 {
1252 	unsigned long flags;
1253 	long result = 0, count1;
1254 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1255 	unsigned long appl_ptr;
1256 	int err = 0;
1257 
1258 	spin_lock_irqsave(&substream->lock, flags);
1259 	snd_rawmidi_buffer_ref(runtime);
1260 	while (count > 0 && runtime->avail) {
1261 		count1 = runtime->buffer_size - runtime->appl_ptr;
1262 		if (count1 > count)
1263 			count1 = count;
1264 		if (count1 > (int)runtime->avail)
1265 			count1 = runtime->avail;
1266 
1267 		/* update runtime->appl_ptr before unlocking for userbuf */
1268 		appl_ptr = runtime->appl_ptr;
1269 		runtime->appl_ptr += count1;
1270 		runtime->appl_ptr %= runtime->buffer_size;
1271 		runtime->avail -= count1;
1272 
1273 		if (kernelbuf)
1274 			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1275 		if (userbuf) {
1276 			spin_unlock_irqrestore(&substream->lock, flags);
1277 			if (copy_to_user(userbuf + result,
1278 					 runtime->buffer + appl_ptr, count1))
1279 				err = -EFAULT;
1280 			spin_lock_irqsave(&substream->lock, flags);
1281 			if (err)
1282 				goto out;
1283 		}
1284 		result += count1;
1285 		count -= count1;
1286 	}
1287  out:
1288 	snd_rawmidi_buffer_unref(runtime);
1289 	spin_unlock_irqrestore(&substream->lock, flags);
1290 	return result > 0 ? result : err;
1291 }
1292 
snd_rawmidi_kernel_read(struct snd_rawmidi_substream * substream,unsigned char * buf,long count)1293 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1294 			     unsigned char *buf, long count)
1295 {
1296 	snd_rawmidi_input_trigger(substream, 1);
1297 	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1298 }
1299 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1300 
snd_rawmidi_read(struct file * file,char __user * buf,size_t count,loff_t * offset)1301 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1302 				loff_t *offset)
1303 {
1304 	long result;
1305 	int count1;
1306 	struct snd_rawmidi_file *rfile;
1307 	struct snd_rawmidi_substream *substream;
1308 	struct snd_rawmidi_runtime *runtime;
1309 
1310 	rfile = file->private_data;
1311 	substream = rfile->input;
1312 	if (substream == NULL)
1313 		return -EIO;
1314 	runtime = substream->runtime;
1315 	snd_rawmidi_input_trigger(substream, 1);
1316 	result = 0;
1317 	while (count > 0) {
1318 		spin_lock_irq(&substream->lock);
1319 		while (!__snd_rawmidi_ready(runtime)) {
1320 			wait_queue_entry_t wait;
1321 
1322 			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1323 				spin_unlock_irq(&substream->lock);
1324 				return result > 0 ? result : -EAGAIN;
1325 			}
1326 			init_waitqueue_entry(&wait, current);
1327 			add_wait_queue(&runtime->sleep, &wait);
1328 			set_current_state(TASK_INTERRUPTIBLE);
1329 			spin_unlock_irq(&substream->lock);
1330 			schedule();
1331 			remove_wait_queue(&runtime->sleep, &wait);
1332 			if (rfile->rmidi->card->shutdown)
1333 				return -ENODEV;
1334 			if (signal_pending(current))
1335 				return result > 0 ? result : -ERESTARTSYS;
1336 			spin_lock_irq(&substream->lock);
1337 			if (!runtime->avail) {
1338 				spin_unlock_irq(&substream->lock);
1339 				return result > 0 ? result : -EIO;
1340 			}
1341 		}
1342 		spin_unlock_irq(&substream->lock);
1343 		count1 = snd_rawmidi_kernel_read1(substream,
1344 						  (unsigned char __user *)buf,
1345 						  NULL/*kernelbuf*/,
1346 						  count);
1347 		if (count1 < 0)
1348 			return result > 0 ? result : count1;
1349 		result += count1;
1350 		buf += count1;
1351 		count -= count1;
1352 	}
1353 	return result;
1354 }
1355 
1356 /**
1357  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1358  * @substream: the rawmidi substream
1359  *
1360  * Return: 1 if the internal output buffer is empty, 0 if not.
1361  */
snd_rawmidi_transmit_empty(struct snd_rawmidi_substream * substream)1362 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1363 {
1364 	struct snd_rawmidi_runtime *runtime;
1365 	int result;
1366 	unsigned long flags;
1367 
1368 	spin_lock_irqsave(&substream->lock, flags);
1369 	runtime = substream->runtime;
1370 	if (!substream->opened || !runtime || !runtime->buffer) {
1371 		rmidi_dbg(substream->rmidi,
1372 			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1373 		result = 1;
1374 	} else {
1375 		result = runtime->avail >= runtime->buffer_size;
1376 	}
1377 	spin_unlock_irqrestore(&substream->lock, flags);
1378 	return result;
1379 }
1380 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1381 
1382 /*
1383  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1384  * @substream: the rawmidi substream
1385  * @buffer: the buffer pointer
1386  * @count: data size to transfer
1387  *
1388  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1389  */
__snd_rawmidi_transmit_peek(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1390 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1391 				       unsigned char *buffer, int count)
1392 {
1393 	int result, count1;
1394 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1395 
1396 	if (runtime->buffer == NULL) {
1397 		rmidi_dbg(substream->rmidi,
1398 			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1399 		return -EINVAL;
1400 	}
1401 	result = 0;
1402 	if (runtime->avail >= runtime->buffer_size) {
1403 		/* warning: lowlevel layer MUST trigger down the hardware */
1404 		goto __skip;
1405 	}
1406 	if (count == 1) {	/* special case, faster code */
1407 		*buffer = runtime->buffer[runtime->hw_ptr];
1408 		result++;
1409 	} else {
1410 		count1 = runtime->buffer_size - runtime->hw_ptr;
1411 		if (count1 > count)
1412 			count1 = count;
1413 		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1414 			count1 = runtime->buffer_size - runtime->avail;
1415 		count1 = get_aligned_size(runtime, count1);
1416 		if (!count1)
1417 			goto __skip;
1418 		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1419 		count -= count1;
1420 		result += count1;
1421 		if (count > 0) {
1422 			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1423 				count = runtime->buffer_size - runtime->avail - count1;
1424 			count = get_aligned_size(runtime, count);
1425 			if (!count)
1426 				goto __skip;
1427 			memcpy(buffer + count1, runtime->buffer, count);
1428 			result += count;
1429 		}
1430 	}
1431       __skip:
1432 	return result;
1433 }
1434 
1435 /**
1436  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1437  * @substream: the rawmidi substream
1438  * @buffer: the buffer pointer
1439  * @count: data size to transfer
1440  *
1441  * Copies data from the internal output buffer to the given buffer.
1442  *
1443  * Call this in the interrupt handler when the midi output is ready,
1444  * and call snd_rawmidi_transmit_ack() after the transmission is
1445  * finished.
1446  *
1447  * Return: The size of copied data, or a negative error code on failure.
1448  */
snd_rawmidi_transmit_peek(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1449 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1450 			      unsigned char *buffer, int count)
1451 {
1452 	int result;
1453 	unsigned long flags;
1454 
1455 	spin_lock_irqsave(&substream->lock, flags);
1456 	if (!substream->opened || !substream->runtime)
1457 		result = -EBADFD;
1458 	else
1459 		result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1460 	spin_unlock_irqrestore(&substream->lock, flags);
1461 	return result;
1462 }
1463 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1464 
1465 /*
1466  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1467  * @substream: the rawmidi substream
1468  * @count: the transferred count
1469  *
1470  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1471  */
__snd_rawmidi_transmit_ack(struct snd_rawmidi_substream * substream,int count)1472 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1473 				      int count)
1474 {
1475 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1476 
1477 	if (runtime->buffer == NULL) {
1478 		rmidi_dbg(substream->rmidi,
1479 			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1480 		return -EINVAL;
1481 	}
1482 	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1483 	count = get_aligned_size(runtime, count);
1484 	runtime->hw_ptr += count;
1485 	runtime->hw_ptr %= runtime->buffer_size;
1486 	runtime->avail += count;
1487 	substream->bytes += count;
1488 	if (count > 0) {
1489 		if (runtime->drain || __snd_rawmidi_ready(runtime))
1490 			wake_up(&runtime->sleep);
1491 	}
1492 	return count;
1493 }
1494 
1495 /**
1496  * snd_rawmidi_transmit_ack - acknowledge the transmission
1497  * @substream: the rawmidi substream
1498  * @count: the transferred count
1499  *
1500  * Advances the hardware pointer for the internal output buffer with
1501  * the given size and updates the condition.
1502  * Call after the transmission is finished.
1503  *
1504  * Return: The advanced size if successful, or a negative error code on failure.
1505  */
snd_rawmidi_transmit_ack(struct snd_rawmidi_substream * substream,int count)1506 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1507 {
1508 	int result;
1509 	unsigned long flags;
1510 
1511 	spin_lock_irqsave(&substream->lock, flags);
1512 	if (!substream->opened || !substream->runtime)
1513 		result = -EBADFD;
1514 	else
1515 		result = __snd_rawmidi_transmit_ack(substream, count);
1516 	spin_unlock_irqrestore(&substream->lock, flags);
1517 	return result;
1518 }
1519 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1520 
1521 /**
1522  * snd_rawmidi_transmit - copy from the buffer to the device
1523  * @substream: the rawmidi substream
1524  * @buffer: the buffer pointer
1525  * @count: the data size to transfer
1526  *
1527  * Copies data from the buffer to the device and advances the pointer.
1528  *
1529  * Return: The copied size if successful, or a negative error code on failure.
1530  */
snd_rawmidi_transmit(struct snd_rawmidi_substream * substream,unsigned char * buffer,int count)1531 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1532 			 unsigned char *buffer, int count)
1533 {
1534 	int result;
1535 	unsigned long flags;
1536 
1537 	spin_lock_irqsave(&substream->lock, flags);
1538 	if (!substream->opened)
1539 		result = -EBADFD;
1540 	else {
1541 		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1542 		if (count <= 0)
1543 			result = count;
1544 		else
1545 			result = __snd_rawmidi_transmit_ack(substream, count);
1546 	}
1547 	spin_unlock_irqrestore(&substream->lock, flags);
1548 	return result;
1549 }
1550 EXPORT_SYMBOL(snd_rawmidi_transmit);
1551 
1552 /**
1553  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1554  * @substream: rawmidi substream
1555  *
1556  * Return: the number of discarded bytes
1557  */
snd_rawmidi_proceed(struct snd_rawmidi_substream * substream)1558 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1559 {
1560 	struct snd_rawmidi_runtime *runtime;
1561 	unsigned long flags;
1562 	int count = 0;
1563 
1564 	spin_lock_irqsave(&substream->lock, flags);
1565 	runtime = substream->runtime;
1566 	if (substream->opened && runtime &&
1567 	    runtime->avail < runtime->buffer_size) {
1568 		count = runtime->buffer_size - runtime->avail;
1569 		__snd_rawmidi_transmit_ack(substream, count);
1570 	}
1571 	spin_unlock_irqrestore(&substream->lock, flags);
1572 	return count;
1573 }
1574 EXPORT_SYMBOL(snd_rawmidi_proceed);
1575 
snd_rawmidi_kernel_write1(struct snd_rawmidi_substream * substream,const unsigned char __user * userbuf,const unsigned char * kernelbuf,long count)1576 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1577 				      const unsigned char __user *userbuf,
1578 				      const unsigned char *kernelbuf,
1579 				      long count)
1580 {
1581 	unsigned long flags;
1582 	long count1, result;
1583 	struct snd_rawmidi_runtime *runtime = substream->runtime;
1584 	unsigned long appl_ptr;
1585 
1586 	if (!kernelbuf && !userbuf)
1587 		return -EINVAL;
1588 	if (snd_BUG_ON(!runtime->buffer))
1589 		return -EINVAL;
1590 
1591 	result = 0;
1592 	spin_lock_irqsave(&substream->lock, flags);
1593 	if (substream->append) {
1594 		if ((long)runtime->avail < count) {
1595 			spin_unlock_irqrestore(&substream->lock, flags);
1596 			return -EAGAIN;
1597 		}
1598 	}
1599 	snd_rawmidi_buffer_ref(runtime);
1600 	while (count > 0 && runtime->avail > 0) {
1601 		count1 = runtime->buffer_size - runtime->appl_ptr;
1602 		if (count1 > count)
1603 			count1 = count;
1604 		if (count1 > (long)runtime->avail)
1605 			count1 = runtime->avail;
1606 
1607 		/* update runtime->appl_ptr before unlocking for userbuf */
1608 		appl_ptr = runtime->appl_ptr;
1609 		runtime->appl_ptr += count1;
1610 		runtime->appl_ptr %= runtime->buffer_size;
1611 		runtime->avail -= count1;
1612 
1613 		if (kernelbuf)
1614 			memcpy(runtime->buffer + appl_ptr,
1615 			       kernelbuf + result, count1);
1616 		else if (userbuf) {
1617 			spin_unlock_irqrestore(&substream->lock, flags);
1618 			if (copy_from_user(runtime->buffer + appl_ptr,
1619 					   userbuf + result, count1)) {
1620 				spin_lock_irqsave(&substream->lock, flags);
1621 				result = result > 0 ? result : -EFAULT;
1622 				goto __end;
1623 			}
1624 			spin_lock_irqsave(&substream->lock, flags);
1625 		}
1626 		result += count1;
1627 		count -= count1;
1628 	}
1629       __end:
1630 	count1 = runtime->avail < runtime->buffer_size;
1631 	snd_rawmidi_buffer_unref(runtime);
1632 	spin_unlock_irqrestore(&substream->lock, flags);
1633 	if (count1)
1634 		snd_rawmidi_output_trigger(substream, 1);
1635 	return result;
1636 }
1637 
snd_rawmidi_kernel_write(struct snd_rawmidi_substream * substream,const unsigned char * buf,long count)1638 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1639 			      const unsigned char *buf, long count)
1640 {
1641 	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1642 }
1643 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1644 
snd_rawmidi_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)1645 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1646 				 size_t count, loff_t *offset)
1647 {
1648 	long result, timeout;
1649 	int count1;
1650 	struct snd_rawmidi_file *rfile;
1651 	struct snd_rawmidi_runtime *runtime;
1652 	struct snd_rawmidi_substream *substream;
1653 
1654 	rfile = file->private_data;
1655 	substream = rfile->output;
1656 	runtime = substream->runtime;
1657 	/* we cannot put an atomic message to our buffer */
1658 	if (substream->append && count > runtime->buffer_size)
1659 		return -EIO;
1660 	result = 0;
1661 	while (count > 0) {
1662 		spin_lock_irq(&substream->lock);
1663 		while (!snd_rawmidi_ready_append(substream, count)) {
1664 			wait_queue_entry_t wait;
1665 
1666 			if (file->f_flags & O_NONBLOCK) {
1667 				spin_unlock_irq(&substream->lock);
1668 				return result > 0 ? result : -EAGAIN;
1669 			}
1670 			init_waitqueue_entry(&wait, current);
1671 			add_wait_queue(&runtime->sleep, &wait);
1672 			set_current_state(TASK_INTERRUPTIBLE);
1673 			spin_unlock_irq(&substream->lock);
1674 			timeout = schedule_timeout(30 * HZ);
1675 			remove_wait_queue(&runtime->sleep, &wait);
1676 			if (rfile->rmidi->card->shutdown)
1677 				return -ENODEV;
1678 			if (signal_pending(current))
1679 				return result > 0 ? result : -ERESTARTSYS;
1680 			spin_lock_irq(&substream->lock);
1681 			if (!runtime->avail && !timeout) {
1682 				spin_unlock_irq(&substream->lock);
1683 				return result > 0 ? result : -EIO;
1684 			}
1685 		}
1686 		spin_unlock_irq(&substream->lock);
1687 		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1688 		if (count1 < 0)
1689 			return result > 0 ? result : count1;
1690 		result += count1;
1691 		buf += count1;
1692 		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1693 			break;
1694 		count -= count1;
1695 	}
1696 	if (file->f_flags & O_DSYNC) {
1697 		spin_lock_irq(&substream->lock);
1698 		while (runtime->avail != runtime->buffer_size) {
1699 			wait_queue_entry_t wait;
1700 			unsigned int last_avail = runtime->avail;
1701 
1702 			init_waitqueue_entry(&wait, current);
1703 			add_wait_queue(&runtime->sleep, &wait);
1704 			set_current_state(TASK_INTERRUPTIBLE);
1705 			spin_unlock_irq(&substream->lock);
1706 			timeout = schedule_timeout(30 * HZ);
1707 			remove_wait_queue(&runtime->sleep, &wait);
1708 			if (signal_pending(current))
1709 				return result > 0 ? result : -ERESTARTSYS;
1710 			if (runtime->avail == last_avail && !timeout)
1711 				return result > 0 ? result : -EIO;
1712 			spin_lock_irq(&substream->lock);
1713 		}
1714 		spin_unlock_irq(&substream->lock);
1715 	}
1716 	return result;
1717 }
1718 
snd_rawmidi_poll(struct file * file,poll_table * wait)1719 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1720 {
1721 	struct snd_rawmidi_file *rfile;
1722 	struct snd_rawmidi_runtime *runtime;
1723 	__poll_t mask;
1724 
1725 	rfile = file->private_data;
1726 	if (rfile->input != NULL) {
1727 		runtime = rfile->input->runtime;
1728 		snd_rawmidi_input_trigger(rfile->input, 1);
1729 		poll_wait(file, &runtime->sleep, wait);
1730 	}
1731 	if (rfile->output != NULL) {
1732 		runtime = rfile->output->runtime;
1733 		poll_wait(file, &runtime->sleep, wait);
1734 	}
1735 	mask = 0;
1736 	if (rfile->input != NULL) {
1737 		if (snd_rawmidi_ready(rfile->input))
1738 			mask |= EPOLLIN | EPOLLRDNORM;
1739 	}
1740 	if (rfile->output != NULL) {
1741 		if (snd_rawmidi_ready(rfile->output))
1742 			mask |= EPOLLOUT | EPOLLWRNORM;
1743 	}
1744 	return mask;
1745 }
1746 
1747 /*
1748  */
1749 #ifdef CONFIG_COMPAT
1750 #include "rawmidi_compat.c"
1751 #else
1752 #define snd_rawmidi_ioctl_compat	NULL
1753 #endif
1754 
1755 /*
1756  */
1757 
snd_rawmidi_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1758 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1759 				       struct snd_info_buffer *buffer)
1760 {
1761 	struct snd_rawmidi *rmidi;
1762 	struct snd_rawmidi_substream *substream;
1763 	struct snd_rawmidi_runtime *runtime;
1764 	unsigned long buffer_size, avail, xruns;
1765 	unsigned int clock_type;
1766 	static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1767 
1768 	rmidi = entry->private_data;
1769 	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1770 	if (IS_ENABLED(CONFIG_SND_UMP))
1771 		snd_iprintf(buffer, "Type: %s\n",
1772 			    rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1773 	if (rmidi->ops && rmidi->ops->proc_read)
1774 		rmidi->ops->proc_read(entry, buffer);
1775 	mutex_lock(&rmidi->open_mutex);
1776 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1777 		list_for_each_entry(substream,
1778 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1779 				    list) {
1780 			snd_iprintf(buffer,
1781 				    "Output %d\n"
1782 				    "  Tx bytes     : %lu\n",
1783 				    substream->number,
1784 				    (unsigned long) substream->bytes);
1785 			if (substream->opened) {
1786 				snd_iprintf(buffer,
1787 				    "  Owner PID    : %d\n",
1788 				    pid_vnr(substream->pid));
1789 				runtime = substream->runtime;
1790 				spin_lock_irq(&substream->lock);
1791 				buffer_size = runtime->buffer_size;
1792 				avail = runtime->avail;
1793 				spin_unlock_irq(&substream->lock);
1794 				snd_iprintf(buffer,
1795 				    "  Mode         : %s\n"
1796 				    "  Buffer size  : %lu\n"
1797 				    "  Avail        : %lu\n",
1798 				    runtime->oss ? "OSS compatible" : "native",
1799 				    buffer_size, avail);
1800 			}
1801 		}
1802 	}
1803 	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1804 		list_for_each_entry(substream,
1805 				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1806 				    list) {
1807 			snd_iprintf(buffer,
1808 				    "Input %d\n"
1809 				    "  Rx bytes     : %lu\n",
1810 				    substream->number,
1811 				    (unsigned long) substream->bytes);
1812 			if (substream->opened) {
1813 				snd_iprintf(buffer,
1814 					    "  Owner PID    : %d\n",
1815 					    pid_vnr(substream->pid));
1816 				runtime = substream->runtime;
1817 				spin_lock_irq(&substream->lock);
1818 				buffer_size = runtime->buffer_size;
1819 				avail = runtime->avail;
1820 				xruns = runtime->xruns;
1821 				spin_unlock_irq(&substream->lock);
1822 				snd_iprintf(buffer,
1823 					    "  Buffer size  : %lu\n"
1824 					    "  Avail        : %lu\n"
1825 					    "  Overruns     : %lu\n",
1826 					    buffer_size, avail, xruns);
1827 				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1828 					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1829 					if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1830 						snd_iprintf(buffer,
1831 							    "  Framing      : tstamp\n"
1832 							    "  Clock type   : %s\n",
1833 							    clock_names[clock_type]);
1834 				}
1835 			}
1836 		}
1837 	}
1838 	mutex_unlock(&rmidi->open_mutex);
1839 }
1840 
1841 /*
1842  *  Register functions
1843  */
1844 
1845 static const struct file_operations snd_rawmidi_f_ops = {
1846 	.owner =	THIS_MODULE,
1847 	.read =		snd_rawmidi_read,
1848 	.write =	snd_rawmidi_write,
1849 	.open =		snd_rawmidi_open,
1850 	.release =	snd_rawmidi_release,
1851 	.llseek =	no_llseek,
1852 	.poll =		snd_rawmidi_poll,
1853 	.unlocked_ioctl =	snd_rawmidi_ioctl,
1854 	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1855 };
1856 
snd_rawmidi_alloc_substreams(struct snd_rawmidi * rmidi,struct snd_rawmidi_str * stream,int direction,int count)1857 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1858 					struct snd_rawmidi_str *stream,
1859 					int direction,
1860 					int count)
1861 {
1862 	struct snd_rawmidi_substream *substream;
1863 	int idx;
1864 
1865 	for (idx = 0; idx < count; idx++) {
1866 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1867 		if (!substream)
1868 			return -ENOMEM;
1869 		substream->stream = direction;
1870 		substream->number = idx;
1871 		substream->rmidi = rmidi;
1872 		substream->pstr = stream;
1873 		spin_lock_init(&substream->lock);
1874 		list_add_tail(&substream->list, &stream->substreams);
1875 		stream->substream_count++;
1876 	}
1877 	return 0;
1878 }
1879 
1880 /* used for both rawmidi and ump */
snd_rawmidi_init(struct snd_rawmidi * rmidi,struct snd_card * card,char * id,int device,int output_count,int input_count,unsigned int info_flags)1881 int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1882 		     struct snd_card *card, char *id, int device,
1883 		     int output_count, int input_count,
1884 		     unsigned int info_flags)
1885 {
1886 	int err;
1887 	static const struct snd_device_ops ops = {
1888 		.dev_free = snd_rawmidi_dev_free,
1889 		.dev_register = snd_rawmidi_dev_register,
1890 		.dev_disconnect = snd_rawmidi_dev_disconnect,
1891 	};
1892 
1893 	rmidi->card = card;
1894 	rmidi->device = device;
1895 	mutex_init(&rmidi->open_mutex);
1896 	init_waitqueue_head(&rmidi->open_wait);
1897 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1898 	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1899 	rmidi->info_flags = info_flags;
1900 
1901 	if (id != NULL)
1902 		strscpy(rmidi->id, id, sizeof(rmidi->id));
1903 
1904 	err = snd_device_alloc(&rmidi->dev, card);
1905 	if (err < 0)
1906 		return err;
1907 	if (rawmidi_is_ump(rmidi))
1908 		dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1909 	else
1910 		dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1911 
1912 	err = snd_rawmidi_alloc_substreams(rmidi,
1913 					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1914 					   SNDRV_RAWMIDI_STREAM_INPUT,
1915 					   input_count);
1916 	if (err < 0)
1917 		return err;
1918 	err = snd_rawmidi_alloc_substreams(rmidi,
1919 					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1920 					   SNDRV_RAWMIDI_STREAM_OUTPUT,
1921 					   output_count);
1922 	if (err < 0)
1923 		return err;
1924 	err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1925 	if (err < 0)
1926 		return err;
1927 	return 0;
1928 }
1929 EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1930 
1931 /**
1932  * snd_rawmidi_new - create a rawmidi instance
1933  * @card: the card instance
1934  * @id: the id string
1935  * @device: the device index
1936  * @output_count: the number of output streams
1937  * @input_count: the number of input streams
1938  * @rrawmidi: the pointer to store the new rawmidi instance
1939  *
1940  * Creates a new rawmidi instance.
1941  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1942  *
1943  * Return: Zero if successful, or a negative error code on failure.
1944  */
snd_rawmidi_new(struct snd_card * card,char * id,int device,int output_count,int input_count,struct snd_rawmidi ** rrawmidi)1945 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1946 		    int output_count, int input_count,
1947 		    struct snd_rawmidi **rrawmidi)
1948 {
1949 	struct snd_rawmidi *rmidi;
1950 	int err;
1951 
1952 	if (rrawmidi)
1953 		*rrawmidi = NULL;
1954 	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1955 	if (!rmidi)
1956 		return -ENOMEM;
1957 	err = snd_rawmidi_init(rmidi, card, id, device,
1958 			       output_count, input_count, 0);
1959 	if (err < 0) {
1960 		snd_rawmidi_free(rmidi);
1961 		return err;
1962 	}
1963 	if (rrawmidi)
1964 		*rrawmidi = rmidi;
1965 	return 0;
1966 }
1967 EXPORT_SYMBOL(snd_rawmidi_new);
1968 
snd_rawmidi_free_substreams(struct snd_rawmidi_str * stream)1969 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1970 {
1971 	struct snd_rawmidi_substream *substream;
1972 
1973 	while (!list_empty(&stream->substreams)) {
1974 		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1975 		list_del(&substream->list);
1976 		kfree(substream);
1977 	}
1978 }
1979 
1980 /* called from ump.c, too */
snd_rawmidi_free(struct snd_rawmidi * rmidi)1981 int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1982 {
1983 	if (!rmidi)
1984 		return 0;
1985 
1986 	snd_info_free_entry(rmidi->proc_entry);
1987 	rmidi->proc_entry = NULL;
1988 	if (rmidi->ops && rmidi->ops->dev_unregister)
1989 		rmidi->ops->dev_unregister(rmidi);
1990 
1991 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1992 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1993 	if (rmidi->private_free)
1994 		rmidi->private_free(rmidi);
1995 	put_device(rmidi->dev);
1996 	kfree(rmidi);
1997 	return 0;
1998 }
1999 EXPORT_SYMBOL_GPL(snd_rawmidi_free);
2000 
snd_rawmidi_dev_free(struct snd_device * device)2001 static int snd_rawmidi_dev_free(struct snd_device *device)
2002 {
2003 	struct snd_rawmidi *rmidi = device->device_data;
2004 
2005 	return snd_rawmidi_free(rmidi);
2006 }
2007 
2008 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
snd_rawmidi_dev_seq_free(struct snd_seq_device * device)2009 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
2010 {
2011 	struct snd_rawmidi *rmidi = device->private_data;
2012 
2013 	rmidi->seq_dev = NULL;
2014 }
2015 #endif
2016 
snd_rawmidi_dev_register(struct snd_device * device)2017 static int snd_rawmidi_dev_register(struct snd_device *device)
2018 {
2019 	int err;
2020 	struct snd_info_entry *entry;
2021 	char name[16];
2022 	struct snd_rawmidi *rmidi = device->device_data;
2023 
2024 	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
2025 		return -ENOMEM;
2026 	err = 0;
2027 	mutex_lock(&register_mutex);
2028 	if (snd_rawmidi_search(rmidi->card, rmidi->device))
2029 		err = -EBUSY;
2030 	else
2031 		list_add_tail(&rmidi->list, &snd_rawmidi_devices);
2032 	mutex_unlock(&register_mutex);
2033 	if (err < 0)
2034 		return err;
2035 
2036 	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
2037 				  rmidi->card, rmidi->device,
2038 				  &snd_rawmidi_f_ops, rmidi, rmidi->dev);
2039 	if (err < 0) {
2040 		rmidi_err(rmidi, "unable to register\n");
2041 		goto error;
2042 	}
2043 	if (rmidi->ops && rmidi->ops->dev_register) {
2044 		err = rmidi->ops->dev_register(rmidi);
2045 		if (err < 0)
2046 			goto error_unregister;
2047 	}
2048 #ifdef CONFIG_SND_OSSEMUL
2049 	rmidi->ossreg = 0;
2050 	if (!rawmidi_is_ump(rmidi) &&
2051 	    (int)rmidi->device == midi_map[rmidi->card->number]) {
2052 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2053 					    rmidi->card, 0, &snd_rawmidi_f_ops,
2054 					    rmidi) < 0) {
2055 			rmidi_err(rmidi,
2056 				  "unable to register OSS rawmidi device %i:%i\n",
2057 				  rmidi->card->number, 0);
2058 		} else {
2059 			rmidi->ossreg++;
2060 #ifdef SNDRV_OSS_INFO_DEV_MIDI
2061 			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
2062 #endif
2063 		}
2064 	}
2065 	if (!rawmidi_is_ump(rmidi) &&
2066 	    (int)rmidi->device == amidi_map[rmidi->card->number]) {
2067 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2068 					    rmidi->card, 1, &snd_rawmidi_f_ops,
2069 					    rmidi) < 0) {
2070 			rmidi_err(rmidi,
2071 				  "unable to register OSS rawmidi device %i:%i\n",
2072 				  rmidi->card->number, 1);
2073 		} else {
2074 			rmidi->ossreg++;
2075 		}
2076 	}
2077 #endif /* CONFIG_SND_OSSEMUL */
2078 	sprintf(name, "midi%d", rmidi->device);
2079 	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2080 	if (entry) {
2081 		entry->private_data = rmidi;
2082 		entry->c.text.read = snd_rawmidi_proc_info_read;
2083 		if (snd_info_register(entry) < 0) {
2084 			snd_info_free_entry(entry);
2085 			entry = NULL;
2086 		}
2087 	}
2088 	rmidi->proc_entry = entry;
2089 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
2090 	/* no own registration mechanism? */
2091 	if (!rmidi->ops || !rmidi->ops->dev_register) {
2092 		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2093 			rmidi->seq_dev->private_data = rmidi;
2094 			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2095 			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2096 			snd_device_register(rmidi->card, rmidi->seq_dev);
2097 		}
2098 	}
2099 #endif
2100 	return 0;
2101 
2102  error_unregister:
2103 	snd_unregister_device(rmidi->dev);
2104  error:
2105 	mutex_lock(&register_mutex);
2106 	list_del(&rmidi->list);
2107 	mutex_unlock(&register_mutex);
2108 	return err;
2109 }
2110 
snd_rawmidi_dev_disconnect(struct snd_device * device)2111 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2112 {
2113 	struct snd_rawmidi *rmidi = device->device_data;
2114 	int dir;
2115 
2116 	mutex_lock(&register_mutex);
2117 	mutex_lock(&rmidi->open_mutex);
2118 	wake_up(&rmidi->open_wait);
2119 	list_del_init(&rmidi->list);
2120 	for (dir = 0; dir < 2; dir++) {
2121 		struct snd_rawmidi_substream *s;
2122 
2123 		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2124 			if (s->runtime)
2125 				wake_up(&s->runtime->sleep);
2126 		}
2127 	}
2128 
2129 #ifdef CONFIG_SND_OSSEMUL
2130 	if (rmidi->ossreg) {
2131 		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2132 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2133 #ifdef SNDRV_OSS_INFO_DEV_MIDI
2134 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2135 #endif
2136 		}
2137 		if ((int)rmidi->device == amidi_map[rmidi->card->number])
2138 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2139 		rmidi->ossreg = 0;
2140 	}
2141 #endif /* CONFIG_SND_OSSEMUL */
2142 	snd_unregister_device(rmidi->dev);
2143 	mutex_unlock(&rmidi->open_mutex);
2144 	mutex_unlock(&register_mutex);
2145 	return 0;
2146 }
2147 
2148 /**
2149  * snd_rawmidi_set_ops - set the rawmidi operators
2150  * @rmidi: the rawmidi instance
2151  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2152  * @ops: the operator table
2153  *
2154  * Sets the rawmidi operators for the given stream direction.
2155  */
snd_rawmidi_set_ops(struct snd_rawmidi * rmidi,int stream,const struct snd_rawmidi_ops * ops)2156 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2157 			 const struct snd_rawmidi_ops *ops)
2158 {
2159 	struct snd_rawmidi_substream *substream;
2160 
2161 	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2162 		substream->ops = ops;
2163 }
2164 EXPORT_SYMBOL(snd_rawmidi_set_ops);
2165 
2166 /*
2167  *  ENTRY functions
2168  */
2169 
alsa_rawmidi_init(void)2170 static int __init alsa_rawmidi_init(void)
2171 {
2172 
2173 	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2174 	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2175 #ifdef CONFIG_SND_OSSEMUL
2176 	{ int i;
2177 	/* check device map table */
2178 	for (i = 0; i < SNDRV_CARDS; i++) {
2179 		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2180 			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2181 			       i, midi_map[i]);
2182 			midi_map[i] = 0;
2183 		}
2184 		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2185 			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2186 			       i, amidi_map[i]);
2187 			amidi_map[i] = 1;
2188 		}
2189 	}
2190 	}
2191 #endif /* CONFIG_SND_OSSEMUL */
2192 	return 0;
2193 }
2194 
alsa_rawmidi_exit(void)2195 static void __exit alsa_rawmidi_exit(void)
2196 {
2197 	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2198 	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2199 }
2200 
2201 module_init(alsa_rawmidi_init)
2202 module_exit(alsa_rawmidi_exit)
2203