Root/sound/core/rawmidi.c

1/*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <sound/core.h>
23#include <linux/major.h>
24#include <linux/init.h>
25#include <linux/sched.h>
26#include <linux/slab.h>
27#include <linux/time.h>
28#include <linux/wait.h>
29#include <linux/mutex.h>
30#include <linux/moduleparam.h>
31#include <linux/delay.h>
32#include <sound/rawmidi.h>
33#include <sound/info.h>
34#include <sound/control.h>
35#include <sound/minors.h>
36#include <sound/initval.h>
37
38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
40MODULE_LICENSE("GPL");
41
42#ifdef CONFIG_SND_OSSEMUL
43static int midi_map[SNDRV_CARDS];
44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
45module_param_array(midi_map, int, NULL, 0444);
46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
47module_param_array(amidi_map, int, NULL, 0444);
48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
49#endif /* CONFIG_SND_OSSEMUL */
50
51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
52static int snd_rawmidi_dev_free(struct snd_device *device);
53static int snd_rawmidi_dev_register(struct snd_device *device);
54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
55
56static LIST_HEAD(snd_rawmidi_devices);
57static DEFINE_MUTEX(register_mutex);
58
59static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
60{
61    struct snd_rawmidi *rawmidi;
62
63    list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
64        if (rawmidi->card == card && rawmidi->device == device)
65            return rawmidi;
66    return NULL;
67}
68
69static inline unsigned short snd_rawmidi_file_flags(struct file *file)
70{
71    switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
72    case FMODE_WRITE:
73        return SNDRV_RAWMIDI_LFLG_OUTPUT;
74    case FMODE_READ:
75        return SNDRV_RAWMIDI_LFLG_INPUT;
76    default:
77        return SNDRV_RAWMIDI_LFLG_OPEN;
78    }
79}
80
81static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
82{
83    struct snd_rawmidi_runtime *runtime = substream->runtime;
84    return runtime->avail >= runtime->avail_min;
85}
86
87static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
88                       size_t count)
89{
90    struct snd_rawmidi_runtime *runtime = substream->runtime;
91    return runtime->avail >= runtime->avail_min &&
92           (!substream->append || runtime->avail >= count);
93}
94
95static void snd_rawmidi_input_event_work(struct work_struct *work)
96{
97    struct snd_rawmidi_runtime *runtime =
98        container_of(work, struct snd_rawmidi_runtime, event_work);
99    if (runtime->event)
100        runtime->event(runtime->substream);
101}
102
103static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
104{
105    struct snd_rawmidi_runtime *runtime;
106
107    if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
108        return -ENOMEM;
109    runtime->substream = substream;
110    spin_lock_init(&runtime->lock);
111    init_waitqueue_head(&runtime->sleep);
112    INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
113    runtime->event = NULL;
114    runtime->buffer_size = PAGE_SIZE;
115    runtime->avail_min = 1;
116    if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
117        runtime->avail = 0;
118    else
119        runtime->avail = runtime->buffer_size;
120    if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
121        kfree(runtime);
122        return -ENOMEM;
123    }
124    runtime->appl_ptr = runtime->hw_ptr = 0;
125    substream->runtime = runtime;
126    return 0;
127}
128
129static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
130{
131    struct snd_rawmidi_runtime *runtime = substream->runtime;
132
133    kfree(runtime->buffer);
134    kfree(runtime);
135    substream->runtime = NULL;
136    return 0;
137}
138
139static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
140{
141    if (!substream->opened)
142        return;
143    substream->ops->trigger(substream, up);
144}
145
146static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
147{
148    if (!substream->opened)
149        return;
150    substream->ops->trigger(substream, up);
151    if (!up)
152        cancel_work_sync(&substream->runtime->event_work);
153}
154
155int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
156{
157    unsigned long flags;
158    struct snd_rawmidi_runtime *runtime = substream->runtime;
159
160    snd_rawmidi_output_trigger(substream, 0);
161    runtime->drain = 0;
162    spin_lock_irqsave(&runtime->lock, flags);
163    runtime->appl_ptr = runtime->hw_ptr = 0;
164    runtime->avail = runtime->buffer_size;
165    spin_unlock_irqrestore(&runtime->lock, flags);
166    return 0;
167}
168
169int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
170{
171    int err;
172    long timeout;
173    struct snd_rawmidi_runtime *runtime = substream->runtime;
174
175    err = 0;
176    runtime->drain = 1;
177    timeout = wait_event_interruptible_timeout(runtime->sleep,
178                (runtime->avail >= runtime->buffer_size),
179                10*HZ);
180    if (signal_pending(current))
181        err = -ERESTARTSYS;
182    if (runtime->avail < runtime->buffer_size && !timeout) {
183        snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
184        err = -EIO;
185    }
186    runtime->drain = 0;
187    if (err != -ERESTARTSYS) {
188        /* we need wait a while to make sure that Tx FIFOs are empty */
189        if (substream->ops->drain)
190            substream->ops->drain(substream);
191        else
192            msleep(50);
193        snd_rawmidi_drop_output(substream);
194    }
195    return err;
196}
197
198int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
199{
200    unsigned long flags;
201    struct snd_rawmidi_runtime *runtime = substream->runtime;
202
203    snd_rawmidi_input_trigger(substream, 0);
204    runtime->drain = 0;
205    spin_lock_irqsave(&runtime->lock, flags);
206    runtime->appl_ptr = runtime->hw_ptr = 0;
207    runtime->avail = 0;
208    spin_unlock_irqrestore(&runtime->lock, flags);
209    return 0;
210}
211
212/* look for an available substream for the given stream direction;
213 * if a specific subdevice is given, try to assign it
214 */
215static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
216                int stream, int mode,
217                struct snd_rawmidi_substream **sub_ret)
218{
219    struct snd_rawmidi_substream *substream;
220    struct snd_rawmidi_str *s = &rmidi->streams[stream];
221    static unsigned int info_flags[2] = {
222        [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
223        [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
224    };
225
226    if (!(rmidi->info_flags & info_flags[stream]))
227        return -ENXIO;
228    if (subdevice >= 0 && subdevice >= s->substream_count)
229        return -ENODEV;
230
231    list_for_each_entry(substream, &s->substreams, list) {
232        if (substream->opened) {
233            if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
234                !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
235                !substream->append)
236                continue;
237        }
238        if (subdevice < 0 || subdevice == substream->number) {
239            *sub_ret = substream;
240            return 0;
241        }
242    }
243    return -EAGAIN;
244}
245
246/* open and do ref-counting for the given substream */
247static int open_substream(struct snd_rawmidi *rmidi,
248              struct snd_rawmidi_substream *substream,
249              int mode)
250{
251    int err;
252
253    if (substream->use_count == 0) {
254        err = snd_rawmidi_runtime_create(substream);
255        if (err < 0)
256            return err;
257        err = substream->ops->open(substream);
258        if (err < 0) {
259            snd_rawmidi_runtime_free(substream);
260            return err;
261        }
262        substream->opened = 1;
263        substream->active_sensing = 0;
264        if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
265            substream->append = 1;
266        substream->pid = get_pid(task_pid(current));
267        rmidi->streams[substream->stream].substream_opened++;
268    }
269    substream->use_count++;
270    return 0;
271}
272
273static void close_substream(struct snd_rawmidi *rmidi,
274                struct snd_rawmidi_substream *substream,
275                int cleanup);
276
277static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
278                 struct snd_rawmidi_file *rfile)
279{
280    struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
281    int err;
282
283    rfile->input = rfile->output = NULL;
284    if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
285        err = assign_substream(rmidi, subdevice,
286                       SNDRV_RAWMIDI_STREAM_INPUT,
287                       mode, &sinput);
288        if (err < 0)
289            return err;
290    }
291    if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
292        err = assign_substream(rmidi, subdevice,
293                       SNDRV_RAWMIDI_STREAM_OUTPUT,
294                       mode, &soutput);
295        if (err < 0)
296            return err;
297    }
298
299    if (sinput) {
300        err = open_substream(rmidi, sinput, mode);
301        if (err < 0)
302            return err;
303    }
304    if (soutput) {
305        err = open_substream(rmidi, soutput, mode);
306        if (err < 0) {
307            if (sinput)
308                close_substream(rmidi, sinput, 0);
309            return err;
310        }
311    }
312
313    rfile->rmidi = rmidi;
314    rfile->input = sinput;
315    rfile->output = soutput;
316    return 0;
317}
318
319/* called from sound/core/seq/seq_midi.c */
320int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
321                int mode, struct snd_rawmidi_file * rfile)
322{
323    struct snd_rawmidi *rmidi;
324    int err;
325
326    if (snd_BUG_ON(!rfile))
327        return -EINVAL;
328
329    mutex_lock(&register_mutex);
330    rmidi = snd_rawmidi_search(card, device);
331    if (rmidi == NULL) {
332        mutex_unlock(&register_mutex);
333        return -ENODEV;
334    }
335    if (!try_module_get(rmidi->card->module)) {
336        mutex_unlock(&register_mutex);
337        return -ENXIO;
338    }
339    mutex_unlock(&register_mutex);
340
341    mutex_lock(&rmidi->open_mutex);
342    err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
343    mutex_unlock(&rmidi->open_mutex);
344    if (err < 0)
345        module_put(rmidi->card->module);
346    return err;
347}
348
349static int snd_rawmidi_open(struct inode *inode, struct file *file)
350{
351    int maj = imajor(inode);
352    struct snd_card *card;
353    int subdevice;
354    unsigned short fflags;
355    int err;
356    struct snd_rawmidi *rmidi;
357    struct snd_rawmidi_file *rawmidi_file = NULL;
358    wait_queue_t wait;
359    struct snd_ctl_file *kctl;
360
361    if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
362        return -EINVAL; /* invalid combination */
363
364    err = nonseekable_open(inode, file);
365    if (err < 0)
366        return err;
367
368    if (maj == snd_major) {
369        rmidi = snd_lookup_minor_data(iminor(inode),
370                          SNDRV_DEVICE_TYPE_RAWMIDI);
371#ifdef CONFIG_SND_OSSEMUL
372    } else if (maj == SOUND_MAJOR) {
373        rmidi = snd_lookup_oss_minor_data(iminor(inode),
374                          SNDRV_OSS_DEVICE_TYPE_MIDI);
375#endif
376    } else
377        return -ENXIO;
378
379    if (rmidi == NULL)
380        return -ENODEV;
381
382    if (!try_module_get(rmidi->card->module))
383        return -ENXIO;
384
385    mutex_lock(&rmidi->open_mutex);
386    card = rmidi->card;
387    err = snd_card_file_add(card, file);
388    if (err < 0)
389        goto __error_card;
390    fflags = snd_rawmidi_file_flags(file);
391    if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
392        fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
393    rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
394    if (rawmidi_file == NULL) {
395        err = -ENOMEM;
396        goto __error;
397    }
398    init_waitqueue_entry(&wait, current);
399    add_wait_queue(&rmidi->open_wait, &wait);
400    while (1) {
401        subdevice = -1;
402        read_lock(&card->ctl_files_rwlock);
403        list_for_each_entry(kctl, &card->ctl_files, list) {
404            if (kctl->pid == task_pid(current)) {
405                subdevice = kctl->prefer_rawmidi_subdevice;
406                if (subdevice != -1)
407                    break;
408            }
409        }
410        read_unlock(&card->ctl_files_rwlock);
411        err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
412        if (err >= 0)
413            break;
414        if (err == -EAGAIN) {
415            if (file->f_flags & O_NONBLOCK) {
416                err = -EBUSY;
417                break;
418            }
419        } else
420            break;
421        set_current_state(TASK_INTERRUPTIBLE);
422        mutex_unlock(&rmidi->open_mutex);
423        schedule();
424        mutex_lock(&rmidi->open_mutex);
425        if (signal_pending(current)) {
426            err = -ERESTARTSYS;
427            break;
428        }
429    }
430    remove_wait_queue(&rmidi->open_wait, &wait);
431    if (err < 0) {
432        kfree(rawmidi_file);
433        goto __error;
434    }
435#ifdef CONFIG_SND_OSSEMUL
436    if (rawmidi_file->input && rawmidi_file->input->runtime)
437        rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
438    if (rawmidi_file->output && rawmidi_file->output->runtime)
439        rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
440#endif
441    file->private_data = rawmidi_file;
442    mutex_unlock(&rmidi->open_mutex);
443    return 0;
444
445 __error:
446    snd_card_file_remove(card, file);
447 __error_card:
448    mutex_unlock(&rmidi->open_mutex);
449    module_put(rmidi->card->module);
450    return err;
451}
452
453static void close_substream(struct snd_rawmidi *rmidi,
454                struct snd_rawmidi_substream *substream,
455                int cleanup)
456{
457    if (--substream->use_count)
458        return;
459
460    if (cleanup) {
461        if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
462            snd_rawmidi_input_trigger(substream, 0);
463        else {
464            if (substream->active_sensing) {
465                unsigned char buf = 0xfe;
466                /* sending single active sensing message
467                 * to shut the device up
468                 */
469                snd_rawmidi_kernel_write(substream, &buf, 1);
470            }
471            if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
472                snd_rawmidi_output_trigger(substream, 0);
473        }
474    }
475    substream->ops->close(substream);
476    if (substream->runtime->private_free)
477        substream->runtime->private_free(substream);
478    snd_rawmidi_runtime_free(substream);
479    substream->opened = 0;
480    substream->append = 0;
481    put_pid(substream->pid);
482    substream->pid = NULL;
483    rmidi->streams[substream->stream].substream_opened--;
484}
485
486static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
487{
488    struct snd_rawmidi *rmidi;
489
490    rmidi = rfile->rmidi;
491    mutex_lock(&rmidi->open_mutex);
492    if (rfile->input) {
493        close_substream(rmidi, rfile->input, 1);
494        rfile->input = NULL;
495    }
496    if (rfile->output) {
497        close_substream(rmidi, rfile->output, 1);
498        rfile->output = NULL;
499    }
500    rfile->rmidi = NULL;
501    mutex_unlock(&rmidi->open_mutex);
502    wake_up(&rmidi->open_wait);
503}
504
505/* called from sound/core/seq/seq_midi.c */
506int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
507{
508    struct snd_rawmidi *rmidi;
509
510    if (snd_BUG_ON(!rfile))
511        return -ENXIO;
512    
513    rmidi = rfile->rmidi;
514    rawmidi_release_priv(rfile);
515    module_put(rmidi->card->module);
516    return 0;
517}
518
519static int snd_rawmidi_release(struct inode *inode, struct file *file)
520{
521    struct snd_rawmidi_file *rfile;
522    struct snd_rawmidi *rmidi;
523    struct module *module;
524
525    rfile = file->private_data;
526    rmidi = rfile->rmidi;
527    rawmidi_release_priv(rfile);
528    kfree(rfile);
529    module = rmidi->card->module;
530    snd_card_file_remove(rmidi->card, file);
531    module_put(module);
532    return 0;
533}
534
535static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
536                struct snd_rawmidi_info *info)
537{
538    struct snd_rawmidi *rmidi;
539    
540    if (substream == NULL)
541        return -ENODEV;
542    rmidi = substream->rmidi;
543    memset(info, 0, sizeof(*info));
544    info->card = rmidi->card->number;
545    info->device = rmidi->device;
546    info->subdevice = substream->number;
547    info->stream = substream->stream;
548    info->flags = rmidi->info_flags;
549    strcpy(info->id, rmidi->id);
550    strcpy(info->name, rmidi->name);
551    strcpy(info->subname, substream->name);
552    info->subdevices_count = substream->pstr->substream_count;
553    info->subdevices_avail = (substream->pstr->substream_count -
554                  substream->pstr->substream_opened);
555    return 0;
556}
557
558static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
559                 struct snd_rawmidi_info __user * _info)
560{
561    struct snd_rawmidi_info info;
562    int err;
563    if ((err = snd_rawmidi_info(substream, &info)) < 0)
564        return err;
565    if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
566        return -EFAULT;
567    return 0;
568}
569
570int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
571{
572    struct snd_rawmidi *rmidi;
573    struct snd_rawmidi_str *pstr;
574    struct snd_rawmidi_substream *substream;
575
576    mutex_lock(&register_mutex);
577    rmidi = snd_rawmidi_search(card, info->device);
578    mutex_unlock(&register_mutex);
579    if (!rmidi)
580        return -ENXIO;
581    if (info->stream < 0 || info->stream > 1)
582        return -EINVAL;
583    pstr = &rmidi->streams[info->stream];
584    if (pstr->substream_count == 0)
585        return -ENOENT;
586    if (info->subdevice >= pstr->substream_count)
587        return -ENXIO;
588    list_for_each_entry(substream, &pstr->substreams, list) {
589        if ((unsigned int)substream->number == info->subdevice)
590            return snd_rawmidi_info(substream, info);
591    }
592    return -ENXIO;
593}
594
595static int snd_rawmidi_info_select_user(struct snd_card *card,
596                    struct snd_rawmidi_info __user *_info)
597{
598    int err;
599    struct snd_rawmidi_info info;
600    if (get_user(info.device, &_info->device))
601        return -EFAULT;
602    if (get_user(info.stream, &_info->stream))
603        return -EFAULT;
604    if (get_user(info.subdevice, &_info->subdevice))
605        return -EFAULT;
606    if ((err = snd_rawmidi_info_select(card, &info)) < 0)
607        return err;
608    if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
609        return -EFAULT;
610    return 0;
611}
612
613int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
614                  struct snd_rawmidi_params * params)
615{
616    char *newbuf;
617    struct snd_rawmidi_runtime *runtime = substream->runtime;
618    
619    if (substream->append && substream->use_count > 1)
620        return -EBUSY;
621    snd_rawmidi_drain_output(substream);
622    if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
623        return -EINVAL;
624    }
625    if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
626        return -EINVAL;
627    }
628    if (params->buffer_size != runtime->buffer_size) {
629        newbuf = krealloc(runtime->buffer, params->buffer_size,
630                  GFP_KERNEL);
631        if (!newbuf)
632            return -ENOMEM;
633        runtime->buffer = newbuf;
634        runtime->buffer_size = params->buffer_size;
635        runtime->avail = runtime->buffer_size;
636    }
637    runtime->avail_min = params->avail_min;
638    substream->active_sensing = !params->no_active_sensing;
639    return 0;
640}
641
642int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
643                 struct snd_rawmidi_params * params)
644{
645    char *newbuf;
646    struct snd_rawmidi_runtime *runtime = substream->runtime;
647
648    snd_rawmidi_drain_input(substream);
649    if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
650        return -EINVAL;
651    }
652    if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
653        return -EINVAL;
654    }
655    if (params->buffer_size != runtime->buffer_size) {
656        newbuf = krealloc(runtime->buffer, params->buffer_size,
657                  GFP_KERNEL);
658        if (!newbuf)
659            return -ENOMEM;
660        runtime->buffer = newbuf;
661        runtime->buffer_size = params->buffer_size;
662    }
663    runtime->avail_min = params->avail_min;
664    return 0;
665}
666
667static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
668                     struct snd_rawmidi_status * status)
669{
670    struct snd_rawmidi_runtime *runtime = substream->runtime;
671
672    memset(status, 0, sizeof(*status));
673    status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
674    spin_lock_irq(&runtime->lock);
675    status->avail = runtime->avail;
676    spin_unlock_irq(&runtime->lock);
677    return 0;
678}
679
680static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
681                    struct snd_rawmidi_status * status)
682{
683    struct snd_rawmidi_runtime *runtime = substream->runtime;
684
685    memset(status, 0, sizeof(*status));
686    status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
687    spin_lock_irq(&runtime->lock);
688    status->avail = runtime->avail;
689    status->xruns = runtime->xruns;
690    runtime->xruns = 0;
691    spin_unlock_irq(&runtime->lock);
692    return 0;
693}
694
695static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
696{
697    struct snd_rawmidi_file *rfile;
698    void __user *argp = (void __user *)arg;
699
700    rfile = file->private_data;
701    if (((cmd >> 8) & 0xff) != 'W')
702        return -ENOTTY;
703    switch (cmd) {
704    case SNDRV_RAWMIDI_IOCTL_PVERSION:
705        return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
706    case SNDRV_RAWMIDI_IOCTL_INFO:
707    {
708        int stream;
709        struct snd_rawmidi_info __user *info = argp;
710        if (get_user(stream, &info->stream))
711            return -EFAULT;
712        switch (stream) {
713        case SNDRV_RAWMIDI_STREAM_INPUT:
714            return snd_rawmidi_info_user(rfile->input, info);
715        case SNDRV_RAWMIDI_STREAM_OUTPUT:
716            return snd_rawmidi_info_user(rfile->output, info);
717        default:
718            return -EINVAL;
719        }
720    }
721    case SNDRV_RAWMIDI_IOCTL_PARAMS:
722    {
723        struct snd_rawmidi_params params;
724        if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
725            return -EFAULT;
726        switch (params.stream) {
727        case SNDRV_RAWMIDI_STREAM_OUTPUT:
728            if (rfile->output == NULL)
729                return -EINVAL;
730            return snd_rawmidi_output_params(rfile->output, &params);
731        case SNDRV_RAWMIDI_STREAM_INPUT:
732            if (rfile->input == NULL)
733                return -EINVAL;
734            return snd_rawmidi_input_params(rfile->input, &params);
735        default:
736            return -EINVAL;
737        }
738    }
739    case SNDRV_RAWMIDI_IOCTL_STATUS:
740    {
741        int err = 0;
742        struct snd_rawmidi_status status;
743        if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
744            return -EFAULT;
745        switch (status.stream) {
746        case SNDRV_RAWMIDI_STREAM_OUTPUT:
747            if (rfile->output == NULL)
748                return -EINVAL;
749            err = snd_rawmidi_output_status(rfile->output, &status);
750            break;
751        case SNDRV_RAWMIDI_STREAM_INPUT:
752            if (rfile->input == NULL)
753                return -EINVAL;
754            err = snd_rawmidi_input_status(rfile->input, &status);
755            break;
756        default:
757            return -EINVAL;
758        }
759        if (err < 0)
760            return err;
761        if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
762            return -EFAULT;
763        return 0;
764    }
765    case SNDRV_RAWMIDI_IOCTL_DROP:
766    {
767        int val;
768        if (get_user(val, (int __user *) argp))
769            return -EFAULT;
770        switch (val) {
771        case SNDRV_RAWMIDI_STREAM_OUTPUT:
772            if (rfile->output == NULL)
773                return -EINVAL;
774            return snd_rawmidi_drop_output(rfile->output);
775        default:
776            return -EINVAL;
777        }
778    }
779    case SNDRV_RAWMIDI_IOCTL_DRAIN:
780    {
781        int val;
782        if (get_user(val, (int __user *) argp))
783            return -EFAULT;
784        switch (val) {
785        case SNDRV_RAWMIDI_STREAM_OUTPUT:
786            if (rfile->output == NULL)
787                return -EINVAL;
788            return snd_rawmidi_drain_output(rfile->output);
789        case SNDRV_RAWMIDI_STREAM_INPUT:
790            if (rfile->input == NULL)
791                return -EINVAL;
792            return snd_rawmidi_drain_input(rfile->input);
793        default:
794            return -EINVAL;
795        }
796    }
797#ifdef CONFIG_SND_DEBUG
798    default:
799        snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
800#endif
801    }
802    return -ENOTTY;
803}
804
805static int snd_rawmidi_control_ioctl(struct snd_card *card,
806                     struct snd_ctl_file *control,
807                     unsigned int cmd,
808                     unsigned long arg)
809{
810    void __user *argp = (void __user *)arg;
811
812    switch (cmd) {
813    case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
814    {
815        int device;
816        
817        if (get_user(device, (int __user *)argp))
818            return -EFAULT;
819        if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
820            device = SNDRV_RAWMIDI_DEVICES - 1;
821        mutex_lock(&register_mutex);
822        device = device < 0 ? 0 : device + 1;
823        while (device < SNDRV_RAWMIDI_DEVICES) {
824            if (snd_rawmidi_search(card, device))
825                break;
826            device++;
827        }
828        if (device == SNDRV_RAWMIDI_DEVICES)
829            device = -1;
830        mutex_unlock(&register_mutex);
831        if (put_user(device, (int __user *)argp))
832            return -EFAULT;
833        return 0;
834    }
835    case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
836    {
837        int val;
838        
839        if (get_user(val, (int __user *)argp))
840            return -EFAULT;
841        control->prefer_rawmidi_subdevice = val;
842        return 0;
843    }
844    case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
845        return snd_rawmidi_info_select_user(card, argp);
846    }
847    return -ENOIOCTLCMD;
848}
849
850/**
851 * snd_rawmidi_receive - receive the input data from the device
852 * @substream: the rawmidi substream
853 * @buffer: the buffer pointer
854 * @count: the data size to read
855 *
856 * Reads the data from the internal buffer.
857 *
858 * Returns the size of read data, or a negative error code on failure.
859 */
860int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
861            const unsigned char *buffer, int count)
862{
863    unsigned long flags;
864    int result = 0, count1;
865    struct snd_rawmidi_runtime *runtime = substream->runtime;
866
867    if (!substream->opened)
868        return -EBADFD;
869    if (runtime->buffer == NULL) {
870        snd_printd("snd_rawmidi_receive: input is not active!!!\n");
871        return -EINVAL;
872    }
873    spin_lock_irqsave(&runtime->lock, flags);
874    if (count == 1) { /* special case, faster code */
875        substream->bytes++;
876        if (runtime->avail < runtime->buffer_size) {
877            runtime->buffer[runtime->hw_ptr++] = buffer[0];
878            runtime->hw_ptr %= runtime->buffer_size;
879            runtime->avail++;
880            result++;
881        } else {
882            runtime->xruns++;
883        }
884    } else {
885        substream->bytes += count;
886        count1 = runtime->buffer_size - runtime->hw_ptr;
887        if (count1 > count)
888            count1 = count;
889        if (count1 > (int)(runtime->buffer_size - runtime->avail))
890            count1 = runtime->buffer_size - runtime->avail;
891        memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
892        runtime->hw_ptr += count1;
893        runtime->hw_ptr %= runtime->buffer_size;
894        runtime->avail += count1;
895        count -= count1;
896        result += count1;
897        if (count > 0) {
898            buffer += count1;
899            count1 = count;
900            if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
901                count1 = runtime->buffer_size - runtime->avail;
902                runtime->xruns += count - count1;
903            }
904            if (count1 > 0) {
905                memcpy(runtime->buffer, buffer, count1);
906                runtime->hw_ptr = count1;
907                runtime->avail += count1;
908                result += count1;
909            }
910        }
911    }
912    if (result > 0) {
913        if (runtime->event)
914            schedule_work(&runtime->event_work);
915        else if (snd_rawmidi_ready(substream))
916            wake_up(&runtime->sleep);
917    }
918    spin_unlock_irqrestore(&runtime->lock, flags);
919    return result;
920}
921
922static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
923                     unsigned char __user *userbuf,
924                     unsigned char *kernelbuf, long count)
925{
926    unsigned long flags;
927    long result = 0, count1;
928    struct snd_rawmidi_runtime *runtime = substream->runtime;
929
930    while (count > 0 && runtime->avail) {
931        count1 = runtime->buffer_size - runtime->appl_ptr;
932        if (count1 > count)
933            count1 = count;
934        spin_lock_irqsave(&runtime->lock, flags);
935        if (count1 > (int)runtime->avail)
936            count1 = runtime->avail;
937        if (kernelbuf)
938            memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
939        if (userbuf) {
940            spin_unlock_irqrestore(&runtime->lock, flags);
941            if (copy_to_user(userbuf + result,
942                     runtime->buffer + runtime->appl_ptr, count1)) {
943                return result > 0 ? result : -EFAULT;
944            }
945            spin_lock_irqsave(&runtime->lock, flags);
946        }
947        runtime->appl_ptr += count1;
948        runtime->appl_ptr %= runtime->buffer_size;
949        runtime->avail -= count1;
950        spin_unlock_irqrestore(&runtime->lock, flags);
951        result += count1;
952        count -= count1;
953    }
954    return result;
955}
956
957long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
958                 unsigned char *buf, long count)
959{
960    snd_rawmidi_input_trigger(substream, 1);
961    return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
962}
963
964static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
965                loff_t *offset)
966{
967    long result;
968    int count1;
969    struct snd_rawmidi_file *rfile;
970    struct snd_rawmidi_substream *substream;
971    struct snd_rawmidi_runtime *runtime;
972
973    rfile = file->private_data;
974    substream = rfile->input;
975    if (substream == NULL)
976        return -EIO;
977    runtime = substream->runtime;
978    snd_rawmidi_input_trigger(substream, 1);
979    result = 0;
980    while (count > 0) {
981        spin_lock_irq(&runtime->lock);
982        while (!snd_rawmidi_ready(substream)) {
983            wait_queue_t wait;
984            if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
985                spin_unlock_irq(&runtime->lock);
986                return result > 0 ? result : -EAGAIN;
987            }
988            init_waitqueue_entry(&wait, current);
989            add_wait_queue(&runtime->sleep, &wait);
990            set_current_state(TASK_INTERRUPTIBLE);
991            spin_unlock_irq(&runtime->lock);
992            schedule();
993            remove_wait_queue(&runtime->sleep, &wait);
994            if (signal_pending(current))
995                return result > 0 ? result : -ERESTARTSYS;
996            if (!runtime->avail)
997                return result > 0 ? result : -EIO;
998            spin_lock_irq(&runtime->lock);
999        }
1000        spin_unlock_irq(&runtime->lock);
1001        count1 = snd_rawmidi_kernel_read1(substream,
1002                          (unsigned char __user *)buf,
1003                          NULL/*kernelbuf*/,
1004                          count);
1005        if (count1 < 0)
1006            return result > 0 ? result : count1;
1007        result += count1;
1008        buf += count1;
1009        count -= count1;
1010    }
1011    return result;
1012}
1013
1014/**
1015 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1016 * @substream: the rawmidi substream
1017 *
1018 * Returns 1 if the internal output buffer is empty, 0 if not.
1019 */
1020int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1021{
1022    struct snd_rawmidi_runtime *runtime = substream->runtime;
1023    int result;
1024    unsigned long flags;
1025
1026    if (runtime->buffer == NULL) {
1027        snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1028        return 1;
1029    }
1030    spin_lock_irqsave(&runtime->lock, flags);
1031    result = runtime->avail >= runtime->buffer_size;
1032    spin_unlock_irqrestore(&runtime->lock, flags);
1033    return result;
1034}
1035
1036/**
1037 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1038 * @substream: the rawmidi substream
1039 * @buffer: the buffer pointer
1040 * @count: data size to transfer
1041 *
1042 * Copies data from the internal output buffer to the given buffer.
1043 *
1044 * Call this in the interrupt handler when the midi output is ready,
1045 * and call snd_rawmidi_transmit_ack() after the transmission is
1046 * finished.
1047 *
1048 * Returns the size of copied data, or a negative error code on failure.
1049 */
1050int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1051                  unsigned char *buffer, int count)
1052{
1053    unsigned long flags;
1054    int result, count1;
1055    struct snd_rawmidi_runtime *runtime = substream->runtime;
1056
1057    if (runtime->buffer == NULL) {
1058        snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1059        return -EINVAL;
1060    }
1061    result = 0;
1062    spin_lock_irqsave(&runtime->lock, flags);
1063    if (runtime->avail >= runtime->buffer_size) {
1064        /* warning: lowlevel layer MUST trigger down the hardware */
1065        goto __skip;
1066    }
1067    if (count == 1) { /* special case, faster code */
1068        *buffer = runtime->buffer[runtime->hw_ptr];
1069        result++;
1070    } else {
1071        count1 = runtime->buffer_size - runtime->hw_ptr;
1072        if (count1 > count)
1073            count1 = count;
1074        if (count1 > (int)(runtime->buffer_size - runtime->avail))
1075            count1 = runtime->buffer_size - runtime->avail;
1076        memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1077        count -= count1;
1078        result += count1;
1079        if (count > 0) {
1080            if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1081                count = runtime->buffer_size - runtime->avail - count1;
1082            memcpy(buffer + count1, runtime->buffer, count);
1083            result += count;
1084        }
1085    }
1086      __skip:
1087    spin_unlock_irqrestore(&runtime->lock, flags);
1088    return result;
1089}
1090
1091/**
1092 * snd_rawmidi_transmit_ack - acknowledge the transmission
1093 * @substream: the rawmidi substream
1094 * @count: the tranferred count
1095 *
1096 * Advances the hardware pointer for the internal output buffer with
1097 * the given size and updates the condition.
1098 * Call after the transmission is finished.
1099 *
1100 * Returns the advanced size if successful, or a negative error code on failure.
1101 */
1102int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1103{
1104    unsigned long flags;
1105    struct snd_rawmidi_runtime *runtime = substream->runtime;
1106
1107    if (runtime->buffer == NULL) {
1108        snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1109        return -EINVAL;
1110    }
1111    spin_lock_irqsave(&runtime->lock, flags);
1112    snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1113    runtime->hw_ptr += count;
1114    runtime->hw_ptr %= runtime->buffer_size;
1115    runtime->avail += count;
1116    substream->bytes += count;
1117    if (count > 0) {
1118        if (runtime->drain || snd_rawmidi_ready(substream))
1119            wake_up(&runtime->sleep);
1120    }
1121    spin_unlock_irqrestore(&runtime->lock, flags);
1122    return count;
1123}
1124
1125/**
1126 * snd_rawmidi_transmit - copy from the buffer to the device
1127 * @substream: the rawmidi substream
1128 * @buffer: the buffer pointer
1129 * @count: the data size to transfer
1130 *
1131 * Copies data from the buffer to the device and advances the pointer.
1132 *
1133 * Returns the copied size if successful, or a negative error code on failure.
1134 */
1135int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1136             unsigned char *buffer, int count)
1137{
1138    if (!substream->opened)
1139        return -EBADFD;
1140    count = snd_rawmidi_transmit_peek(substream, buffer, count);
1141    if (count < 0)
1142        return count;
1143    return snd_rawmidi_transmit_ack(substream, count);
1144}
1145
1146static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1147                      const unsigned char __user *userbuf,
1148                      const unsigned char *kernelbuf,
1149                      long count)
1150{
1151    unsigned long flags;
1152    long count1, result;
1153    struct snd_rawmidi_runtime *runtime = substream->runtime;
1154
1155    if (snd_BUG_ON(!kernelbuf && !userbuf))
1156        return -EINVAL;
1157    if (snd_BUG_ON(!runtime->buffer))
1158        return -EINVAL;
1159
1160    result = 0;
1161    spin_lock_irqsave(&runtime->lock, flags);
1162    if (substream->append) {
1163        if ((long)runtime->avail < count) {
1164            spin_unlock_irqrestore(&runtime->lock, flags);
1165            return -EAGAIN;
1166        }
1167    }
1168    while (count > 0 && runtime->avail > 0) {
1169        count1 = runtime->buffer_size - runtime->appl_ptr;
1170        if (count1 > count)
1171            count1 = count;
1172        if (count1 > (long)runtime->avail)
1173            count1 = runtime->avail;
1174        if (kernelbuf)
1175            memcpy(runtime->buffer + runtime->appl_ptr,
1176                   kernelbuf + result, count1);
1177        else if (userbuf) {
1178            spin_unlock_irqrestore(&runtime->lock, flags);
1179            if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1180                       userbuf + result, count1)) {
1181                spin_lock_irqsave(&runtime->lock, flags);
1182                result = result > 0 ? result : -EFAULT;
1183                goto __end;
1184            }
1185            spin_lock_irqsave(&runtime->lock, flags);
1186        }
1187        runtime->appl_ptr += count1;
1188        runtime->appl_ptr %= runtime->buffer_size;
1189        runtime->avail -= count1;
1190        result += count1;
1191        count -= count1;
1192    }
1193      __end:
1194    count1 = runtime->avail < runtime->buffer_size;
1195    spin_unlock_irqrestore(&runtime->lock, flags);
1196    if (count1)
1197        snd_rawmidi_output_trigger(substream, 1);
1198    return result;
1199}
1200
1201long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1202                  const unsigned char *buf, long count)
1203{
1204    return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1205}
1206
1207static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1208                 size_t count, loff_t *offset)
1209{
1210    long result, timeout;
1211    int count1;
1212    struct snd_rawmidi_file *rfile;
1213    struct snd_rawmidi_runtime *runtime;
1214    struct snd_rawmidi_substream *substream;
1215
1216    rfile = file->private_data;
1217    substream = rfile->output;
1218    runtime = substream->runtime;
1219    /* we cannot put an atomic message to our buffer */
1220    if (substream->append && count > runtime->buffer_size)
1221        return -EIO;
1222    result = 0;
1223    while (count > 0) {
1224        spin_lock_irq(&runtime->lock);
1225        while (!snd_rawmidi_ready_append(substream, count)) {
1226            wait_queue_t wait;
1227            if (file->f_flags & O_NONBLOCK) {
1228                spin_unlock_irq(&runtime->lock);
1229                return result > 0 ? result : -EAGAIN;
1230            }
1231            init_waitqueue_entry(&wait, current);
1232            add_wait_queue(&runtime->sleep, &wait);
1233            set_current_state(TASK_INTERRUPTIBLE);
1234            spin_unlock_irq(&runtime->lock);
1235            timeout = schedule_timeout(30 * HZ);
1236            remove_wait_queue(&runtime->sleep, &wait);
1237            if (signal_pending(current))
1238                return result > 0 ? result : -ERESTARTSYS;
1239            if (!runtime->avail && !timeout)
1240                return result > 0 ? result : -EIO;
1241            spin_lock_irq(&runtime->lock);
1242        }
1243        spin_unlock_irq(&runtime->lock);
1244        count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1245        if (count1 < 0)
1246            return result > 0 ? result : count1;
1247        result += count1;
1248        buf += count1;
1249        if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1250            break;
1251        count -= count1;
1252    }
1253    if (file->f_flags & O_DSYNC) {
1254        spin_lock_irq(&runtime->lock);
1255        while (runtime->avail != runtime->buffer_size) {
1256            wait_queue_t wait;
1257            unsigned int last_avail = runtime->avail;
1258            init_waitqueue_entry(&wait, current);
1259            add_wait_queue(&runtime->sleep, &wait);
1260            set_current_state(TASK_INTERRUPTIBLE);
1261            spin_unlock_irq(&runtime->lock);
1262            timeout = schedule_timeout(30 * HZ);
1263            remove_wait_queue(&runtime->sleep, &wait);
1264            if (signal_pending(current))
1265                return result > 0 ? result : -ERESTARTSYS;
1266            if (runtime->avail == last_avail && !timeout)
1267                return result > 0 ? result : -EIO;
1268            spin_lock_irq(&runtime->lock);
1269        }
1270        spin_unlock_irq(&runtime->lock);
1271    }
1272    return result;
1273}
1274
1275static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1276{
1277    struct snd_rawmidi_file *rfile;
1278    struct snd_rawmidi_runtime *runtime;
1279    unsigned int mask;
1280
1281    rfile = file->private_data;
1282    if (rfile->input != NULL) {
1283        runtime = rfile->input->runtime;
1284        snd_rawmidi_input_trigger(rfile->input, 1);
1285        poll_wait(file, &runtime->sleep, wait);
1286    }
1287    if (rfile->output != NULL) {
1288        runtime = rfile->output->runtime;
1289        poll_wait(file, &runtime->sleep, wait);
1290    }
1291    mask = 0;
1292    if (rfile->input != NULL) {
1293        if (snd_rawmidi_ready(rfile->input))
1294            mask |= POLLIN | POLLRDNORM;
1295    }
1296    if (rfile->output != NULL) {
1297        if (snd_rawmidi_ready(rfile->output))
1298            mask |= POLLOUT | POLLWRNORM;
1299    }
1300    return mask;
1301}
1302
1303/*
1304 */
1305#ifdef CONFIG_COMPAT
1306#include "rawmidi_compat.c"
1307#else
1308#define snd_rawmidi_ioctl_compat NULL
1309#endif
1310
1311/*
1312
1313 */
1314
1315static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1316                       struct snd_info_buffer *buffer)
1317{
1318    struct snd_rawmidi *rmidi;
1319    struct snd_rawmidi_substream *substream;
1320    struct snd_rawmidi_runtime *runtime;
1321
1322    rmidi = entry->private_data;
1323    snd_iprintf(buffer, "%s\n\n", rmidi->name);
1324    mutex_lock(&rmidi->open_mutex);
1325    if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1326        list_for_each_entry(substream,
1327                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1328                    list) {
1329            snd_iprintf(buffer,
1330                    "Output %d\n"
1331                    " Tx bytes : %lu\n",
1332                    substream->number,
1333                    (unsigned long) substream->bytes);
1334            if (substream->opened) {
1335                snd_iprintf(buffer,
1336                    " Owner PID : %d\n",
1337                    pid_vnr(substream->pid));
1338                runtime = substream->runtime;
1339                snd_iprintf(buffer,
1340                    " Mode : %s\n"
1341                    " Buffer size : %lu\n"
1342                    " Avail : %lu\n",
1343                    runtime->oss ? "OSS compatible" : "native",
1344                    (unsigned long) runtime->buffer_size,
1345                    (unsigned long) runtime->avail);
1346            }
1347        }
1348    }
1349    if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1350        list_for_each_entry(substream,
1351                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1352                    list) {
1353            snd_iprintf(buffer,
1354                    "Input %d\n"
1355                    " Rx bytes : %lu\n",
1356                    substream->number,
1357                    (unsigned long) substream->bytes);
1358            if (substream->opened) {
1359                snd_iprintf(buffer,
1360                        " Owner PID : %d\n",
1361                        pid_vnr(substream->pid));
1362                runtime = substream->runtime;
1363                snd_iprintf(buffer,
1364                        " Buffer size : %lu\n"
1365                        " Avail : %lu\n"
1366                        " Overruns : %lu\n",
1367                        (unsigned long) runtime->buffer_size,
1368                        (unsigned long) runtime->avail,
1369                        (unsigned long) runtime->xruns);
1370            }
1371        }
1372    }
1373    mutex_unlock(&rmidi->open_mutex);
1374}
1375
1376/*
1377 * Register functions
1378 */
1379
1380static const struct file_operations snd_rawmidi_f_ops =
1381{
1382    .owner = THIS_MODULE,
1383    .read = snd_rawmidi_read,
1384    .write = snd_rawmidi_write,
1385    .open = snd_rawmidi_open,
1386    .release = snd_rawmidi_release,
1387    .llseek = no_llseek,
1388    .poll = snd_rawmidi_poll,
1389    .unlocked_ioctl = snd_rawmidi_ioctl,
1390    .compat_ioctl = snd_rawmidi_ioctl_compat,
1391};
1392
1393static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1394                    struct snd_rawmidi_str *stream,
1395                    int direction,
1396                    int count)
1397{
1398    struct snd_rawmidi_substream *substream;
1399    int idx;
1400
1401    for (idx = 0; idx < count; idx++) {
1402        substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1403        if (substream == NULL) {
1404            snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1405            return -ENOMEM;
1406        }
1407        substream->stream = direction;
1408        substream->number = idx;
1409        substream->rmidi = rmidi;
1410        substream->pstr = stream;
1411        list_add_tail(&substream->list, &stream->substreams);
1412        stream->substream_count++;
1413    }
1414    return 0;
1415}
1416
1417/**
1418 * snd_rawmidi_new - create a rawmidi instance
1419 * @card: the card instance
1420 * @id: the id string
1421 * @device: the device index
1422 * @output_count: the number of output streams
1423 * @input_count: the number of input streams
1424 * @rrawmidi: the pointer to store the new rawmidi instance
1425 *
1426 * Creates a new rawmidi instance.
1427 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1428 *
1429 * Returns zero if successful, or a negative error code on failure.
1430 */
1431int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1432            int output_count, int input_count,
1433            struct snd_rawmidi ** rrawmidi)
1434{
1435    struct snd_rawmidi *rmidi;
1436    int err;
1437    static struct snd_device_ops ops = {
1438        .dev_free = snd_rawmidi_dev_free,
1439        .dev_register = snd_rawmidi_dev_register,
1440        .dev_disconnect = snd_rawmidi_dev_disconnect,
1441    };
1442
1443    if (snd_BUG_ON(!card))
1444        return -ENXIO;
1445    if (rrawmidi)
1446        *rrawmidi = NULL;
1447    rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1448    if (rmidi == NULL) {
1449        snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1450        return -ENOMEM;
1451    }
1452    rmidi->card = card;
1453    rmidi->device = device;
1454    mutex_init(&rmidi->open_mutex);
1455    init_waitqueue_head(&rmidi->open_wait);
1456    INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1457    INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1458
1459    if (id != NULL)
1460        strlcpy(rmidi->id, id, sizeof(rmidi->id));
1461    if ((err = snd_rawmidi_alloc_substreams(rmidi,
1462                        &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1463                        SNDRV_RAWMIDI_STREAM_INPUT,
1464                        input_count)) < 0) {
1465        snd_rawmidi_free(rmidi);
1466        return err;
1467    }
1468    if ((err = snd_rawmidi_alloc_substreams(rmidi,
1469                        &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1470                        SNDRV_RAWMIDI_STREAM_OUTPUT,
1471                        output_count)) < 0) {
1472        snd_rawmidi_free(rmidi);
1473        return err;
1474    }
1475    if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1476        snd_rawmidi_free(rmidi);
1477        return err;
1478    }
1479    if (rrawmidi)
1480        *rrawmidi = rmidi;
1481    return 0;
1482}
1483
1484static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1485{
1486    struct snd_rawmidi_substream *substream;
1487
1488    while (!list_empty(&stream->substreams)) {
1489        substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1490        list_del(&substream->list);
1491        kfree(substream);
1492    }
1493}
1494
1495static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1496{
1497    if (!rmidi)
1498        return 0;
1499
1500    snd_info_free_entry(rmidi->proc_entry);
1501    rmidi->proc_entry = NULL;
1502    mutex_lock(&register_mutex);
1503    if (rmidi->ops && rmidi->ops->dev_unregister)
1504        rmidi->ops->dev_unregister(rmidi);
1505    mutex_unlock(&register_mutex);
1506
1507    snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1508    snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1509    if (rmidi->private_free)
1510        rmidi->private_free(rmidi);
1511    kfree(rmidi);
1512    return 0;
1513}
1514
1515static int snd_rawmidi_dev_free(struct snd_device *device)
1516{
1517    struct snd_rawmidi *rmidi = device->device_data;
1518    return snd_rawmidi_free(rmidi);
1519}
1520
1521#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1522static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1523{
1524    struct snd_rawmidi *rmidi = device->private_data;
1525    rmidi->seq_dev = NULL;
1526}
1527#endif
1528
1529static int snd_rawmidi_dev_register(struct snd_device *device)
1530{
1531    int err;
1532    struct snd_info_entry *entry;
1533    char name[16];
1534    struct snd_rawmidi *rmidi = device->device_data;
1535
1536    if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1537        return -ENOMEM;
1538    mutex_lock(&register_mutex);
1539    if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1540        mutex_unlock(&register_mutex);
1541        return -EBUSY;
1542    }
1543    list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1544    sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1545    if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1546                       rmidi->card, rmidi->device,
1547                       &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1548        snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1549        list_del(&rmidi->list);
1550        mutex_unlock(&register_mutex);
1551        return err;
1552    }
1553    if (rmidi->ops && rmidi->ops->dev_register &&
1554        (err = rmidi->ops->dev_register(rmidi)) < 0) {
1555        snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1556        list_del(&rmidi->list);
1557        mutex_unlock(&register_mutex);
1558        return err;
1559    }
1560#ifdef CONFIG_SND_OSSEMUL
1561    rmidi->ossreg = 0;
1562    if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1563        if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1564                        rmidi->card, 0, &snd_rawmidi_f_ops,
1565                        rmidi, name) < 0) {
1566            snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1567        } else {
1568            rmidi->ossreg++;
1569#ifdef SNDRV_OSS_INFO_DEV_MIDI
1570            snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1571#endif
1572        }
1573    }
1574    if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1575        if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576                        rmidi->card, 1, &snd_rawmidi_f_ops,
1577                        rmidi, name) < 0) {
1578            snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1579        } else {
1580            rmidi->ossreg++;
1581        }
1582    }
1583#endif /* CONFIG_SND_OSSEMUL */
1584    mutex_unlock(&register_mutex);
1585    sprintf(name, "midi%d", rmidi->device);
1586    entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1587    if (entry) {
1588        entry->private_data = rmidi;
1589        entry->c.text.read = snd_rawmidi_proc_info_read;
1590        if (snd_info_register(entry) < 0) {
1591            snd_info_free_entry(entry);
1592            entry = NULL;
1593        }
1594    }
1595    rmidi->proc_entry = entry;
1596#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1597    if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1598        if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1599            rmidi->seq_dev->private_data = rmidi;
1600            rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1601            sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1602            snd_device_register(rmidi->card, rmidi->seq_dev);
1603        }
1604    }
1605#endif
1606    return 0;
1607}
1608
1609static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1610{
1611    struct snd_rawmidi *rmidi = device->device_data;
1612
1613    mutex_lock(&register_mutex);
1614    list_del_init(&rmidi->list);
1615#ifdef CONFIG_SND_OSSEMUL
1616    if (rmidi->ossreg) {
1617        if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1618            snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1619#ifdef SNDRV_OSS_INFO_DEV_MIDI
1620            snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1621#endif
1622        }
1623        if ((int)rmidi->device == amidi_map[rmidi->card->number])
1624            snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1625        rmidi->ossreg = 0;
1626    }
1627#endif /* CONFIG_SND_OSSEMUL */
1628    snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1629    mutex_unlock(&register_mutex);
1630    return 0;
1631}
1632
1633/**
1634 * snd_rawmidi_set_ops - set the rawmidi operators
1635 * @rmidi: the rawmidi instance
1636 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1637 * @ops: the operator table
1638 *
1639 * Sets the rawmidi operators for the given stream direction.
1640 */
1641void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1642             struct snd_rawmidi_ops *ops)
1643{
1644    struct snd_rawmidi_substream *substream;
1645    
1646    list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1647        substream->ops = ops;
1648}
1649
1650/*
1651 * ENTRY functions
1652 */
1653
1654static int __init alsa_rawmidi_init(void)
1655{
1656
1657    snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1658    snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1659#ifdef CONFIG_SND_OSSEMUL
1660    { int i;
1661    /* check device map table */
1662    for (i = 0; i < SNDRV_CARDS; i++) {
1663        if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1664            snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1665            midi_map[i] = 0;
1666        }
1667        if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668            snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1669            amidi_map[i] = 1;
1670        }
1671    }
1672    }
1673#endif /* CONFIG_SND_OSSEMUL */
1674    return 0;
1675}
1676
1677static void __exit alsa_rawmidi_exit(void)
1678{
1679    snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1680    snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1681}
1682
1683module_init(alsa_rawmidi_init)
1684module_exit(alsa_rawmidi_exit)
1685
1686EXPORT_SYMBOL(snd_rawmidi_output_params);
1687EXPORT_SYMBOL(snd_rawmidi_input_params);
1688EXPORT_SYMBOL(snd_rawmidi_drop_output);
1689EXPORT_SYMBOL(snd_rawmidi_drain_output);
1690EXPORT_SYMBOL(snd_rawmidi_drain_input);
1691EXPORT_SYMBOL(snd_rawmidi_receive);
1692EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1693EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1694EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1695EXPORT_SYMBOL(snd_rawmidi_transmit);
1696EXPORT_SYMBOL(snd_rawmidi_new);
1697EXPORT_SYMBOL(snd_rawmidi_set_ops);
1698EXPORT_SYMBOL(snd_rawmidi_info_select);
1699EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1700EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1701EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1702EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1703

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