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