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