Merge branch 'fix/asoc' into for-linus
[linux-2.6.git] / sound / core / pcm_compat.c
1 /*
2  *   32bit -> 64bit ioctl wrapper for PCM API
3  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
4  *
5  *   This program is free software; you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *   GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program; if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18  *
19  */
20
21 /* This file included from pcm_native.c */
22
23 #include <linux/compat.h>
24
25 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
26                                       s32 __user *src)
27 {
28         snd_pcm_sframes_t delay;
29         mm_segment_t fs;
30         int err;
31
32         fs = snd_enter_user();
33         err = snd_pcm_delay(substream, &delay);
34         snd_leave_user(fs);
35         if (err < 0)
36                 return err;
37         if (put_user(delay, src))
38                 return -EFAULT;
39         return err;
40 }
41
42 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
43                                        u32 __user *src)
44 {
45         snd_pcm_uframes_t frames;
46         int err;
47
48         if (get_user(frames, src))
49                 return -EFAULT;
50         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
51                 err = snd_pcm_playback_rewind(substream, frames);
52         else
53                 err = snd_pcm_capture_rewind(substream, frames);
54         if (put_user(err, src))
55                 return -EFAULT;
56         return err < 0 ? err : 0;
57 }
58
59 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
60                                        u32 __user *src)
61 {
62         snd_pcm_uframes_t frames;
63         int err;
64
65         if (get_user(frames, src))
66                 return -EFAULT;
67         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
68                 err = snd_pcm_playback_forward(substream, frames);
69         else
70                 err = snd_pcm_capture_forward(substream, frames);
71         if (put_user(err, src))
72                 return -EFAULT;
73         return err < 0 ? err : 0;
74 }
75
76 struct snd_pcm_hw_params32 {
77         u32 flags;
78         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
79         struct snd_mask mres[5];        /* reserved masks */
80         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
81         struct snd_interval ires[9];    /* reserved intervals */
82         u32 rmask;
83         u32 cmask;
84         u32 info;
85         u32 msbits;
86         u32 rate_num;
87         u32 rate_den;
88         u32 fifo_size;
89         unsigned char reserved[64];
90 };
91
92 struct snd_pcm_sw_params32 {
93         s32 tstamp_mode;
94         u32 period_step;
95         u32 sleep_min;
96         u32 avail_min;
97         u32 xfer_align;
98         u32 start_threshold;
99         u32 stop_threshold;
100         u32 silence_threshold;
101         u32 silence_size;
102         u32 boundary;
103         unsigned char reserved[64];
104 };
105
106 /* recalcuate the boundary within 32bit */
107 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
108 {
109         snd_pcm_uframes_t boundary;
110
111         if (! runtime->buffer_size)
112                 return 0;
113         boundary = runtime->buffer_size;
114         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
115                 boundary *= 2;
116         return boundary;
117 }
118
119 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
120                                           struct snd_pcm_sw_params32 __user *src)
121 {
122         struct snd_pcm_sw_params params;
123         snd_pcm_uframes_t boundary;
124         int err;
125
126         memset(&params, 0, sizeof(params));
127         if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
128             get_user(params.period_step, &src->period_step) ||
129             get_user(params.sleep_min, &src->sleep_min) ||
130             get_user(params.avail_min, &src->avail_min) ||
131             get_user(params.xfer_align, &src->xfer_align) ||
132             get_user(params.start_threshold, &src->start_threshold) ||
133             get_user(params.stop_threshold, &src->stop_threshold) ||
134             get_user(params.silence_threshold, &src->silence_threshold) ||
135             get_user(params.silence_size, &src->silence_size))
136                 return -EFAULT;
137         /*
138          * Check silent_size parameter.  Since we have 64bit boundary,
139          * silence_size must be compared with the 32bit boundary.
140          */
141         boundary = recalculate_boundary(substream->runtime);
142         if (boundary && params.silence_size >= boundary)
143                 params.silence_size = substream->runtime->boundary;
144         err = snd_pcm_sw_params(substream, &params);
145         if (err < 0)
146                 return err;
147         if (boundary && put_user(boundary, &src->boundary))
148                 return -EFAULT;
149         return err;
150 }
151
152 struct snd_pcm_channel_info32 {
153         u32 channel;
154         u32 offset;
155         u32 first;
156         u32 step;
157 };
158
159 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
160                                              struct snd_pcm_channel_info32 __user *src)
161 {
162         struct snd_pcm_channel_info info;
163         int err;
164
165         if (get_user(info.channel, &src->channel) ||
166             get_user(info.offset, &src->offset) ||
167             get_user(info.first, &src->first) ||
168             get_user(info.step, &src->step))
169                 return -EFAULT;
170         err = snd_pcm_channel_info(substream, &info);
171         if (err < 0)
172                 return err;
173         if (put_user(info.channel, &src->channel) ||
174             put_user(info.offset, &src->offset) ||
175             put_user(info.first, &src->first) ||
176             put_user(info.step, &src->step))
177                 return -EFAULT;
178         return err;
179 }
180
181 struct snd_pcm_status32 {
182         s32 state;
183         struct compat_timespec trigger_tstamp;
184         struct compat_timespec tstamp;
185         u32 appl_ptr;
186         u32 hw_ptr;
187         s32 delay;
188         u32 avail;
189         u32 avail_max;
190         u32 overrange;
191         s32 suspended_state;
192         unsigned char reserved[60];
193 } __attribute__((packed));
194
195
196 static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
197                                       struct snd_pcm_status32 __user *src)
198 {
199         struct snd_pcm_status status;
200         int err;
201
202         err = snd_pcm_status(substream, &status);
203         if (err < 0)
204                 return err;
205
206         if (put_user(status.state, &src->state) ||
207             put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
208             put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
209             put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
210             put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
211             put_user(status.appl_ptr, &src->appl_ptr) ||
212             put_user(status.hw_ptr, &src->hw_ptr) ||
213             put_user(status.delay, &src->delay) ||
214             put_user(status.avail, &src->avail) ||
215             put_user(status.avail_max, &src->avail_max) ||
216             put_user(status.overrange, &src->overrange) ||
217             put_user(status.suspended_state, &src->suspended_state))
218                 return -EFAULT;
219
220         return err;
221 }
222
223 /* both for HW_PARAMS and HW_REFINE */
224 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
225                                           int refine, 
226                                           struct snd_pcm_hw_params32 __user *data32)
227 {
228         struct snd_pcm_hw_params *data;
229         struct snd_pcm_runtime *runtime;
230         int err;
231
232         if (! (runtime = substream->runtime))
233                 return -ENOTTY;
234
235         /* only fifo_size is different, so just copy all */
236         data = memdup_user(data32, sizeof(*data32));
237         if (IS_ERR(data))
238                 return PTR_ERR(data);
239
240         if (refine)
241                 err = snd_pcm_hw_refine(substream, data);
242         else
243                 err = snd_pcm_hw_params(substream, data);
244         if (err < 0)
245                 goto error;
246         if (copy_to_user(data32, data, sizeof(*data32)) ||
247             put_user(data->fifo_size, &data32->fifo_size)) {
248                 err = -EFAULT;
249                 goto error;
250         }
251
252         if (! refine) {
253                 unsigned int new_boundary = recalculate_boundary(runtime);
254                 if (new_boundary)
255                         runtime->boundary = new_boundary;
256         }
257  error:
258         kfree(data);
259         return err;
260 }
261
262
263 /*
264  */
265 struct snd_xferi32 {
266         s32 result;
267         u32 buf;
268         u32 frames;
269 };
270
271 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
272                                       int dir, struct snd_xferi32 __user *data32)
273 {
274         compat_caddr_t buf;
275         u32 frames;
276         int err;
277
278         if (! substream->runtime)
279                 return -ENOTTY;
280         if (substream->stream != dir)
281                 return -EINVAL;
282         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
283                 return -EBADFD;
284
285         if (get_user(buf, &data32->buf) ||
286             get_user(frames, &data32->frames))
287                 return -EFAULT;
288
289         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
290                 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
291         else
292                 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
293         if (err < 0)
294                 return err;
295         /* copy the result */
296         if (put_user(err, &data32->result))
297                 return -EFAULT;
298         return 0;
299 }
300
301
302 /* snd_xfern needs remapping of bufs */
303 struct snd_xfern32 {
304         s32 result;
305         u32 bufs;  /* this is void **; */
306         u32 frames;
307 };
308
309 /*
310  * xfern ioctl nees to copy (up to) 128 pointers on stack.
311  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
312  * handler there expands again the same 128 pointers on stack, so it is better
313  * to handle the function (calling pcm_readv/writev) directly in this handler.
314  */
315 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
316                                       int dir, struct snd_xfern32 __user *data32)
317 {
318         compat_caddr_t buf;
319         compat_caddr_t __user *bufptr;
320         u32 frames;
321         void __user **bufs;
322         int err, ch, i;
323
324         if (! substream->runtime)
325                 return -ENOTTY;
326         if (substream->stream != dir)
327                 return -EINVAL;
328
329         if ((ch = substream->runtime->channels) > 128)
330                 return -EINVAL;
331         if (get_user(buf, &data32->bufs) ||
332             get_user(frames, &data32->frames))
333                 return -EFAULT;
334         bufptr = compat_ptr(buf);
335         bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
336         if (bufs == NULL)
337                 return -ENOMEM;
338         for (i = 0; i < ch; i++) {
339                 u32 ptr;
340                 if (get_user(ptr, bufptr)) {
341                         kfree(bufs);
342                         return -EFAULT;
343                 }
344                 bufs[ch] = compat_ptr(ptr);
345                 bufptr++;
346         }
347         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
348                 err = snd_pcm_lib_writev(substream, bufs, frames);
349         else
350                 err = snd_pcm_lib_readv(substream, bufs, frames);
351         if (err >= 0) {
352                 if (put_user(err, &data32->result))
353                         err = -EFAULT;
354         }
355         kfree(bufs);
356         return err;
357 }
358
359
360 struct snd_pcm_mmap_status32 {
361         s32 state;
362         s32 pad1;
363         u32 hw_ptr;
364         struct compat_timespec tstamp;
365         s32 suspended_state;
366 } __attribute__((packed));
367
368 struct snd_pcm_mmap_control32 {
369         u32 appl_ptr;
370         u32 avail_min;
371 };
372
373 struct snd_pcm_sync_ptr32 {
374         u32 flags;
375         union {
376                 struct snd_pcm_mmap_status32 status;
377                 unsigned char reserved[64];
378         } s;
379         union {
380                 struct snd_pcm_mmap_control32 control;
381                 unsigned char reserved[64];
382         } c;
383 } __attribute__((packed));
384
385 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
386                                          struct snd_pcm_sync_ptr32 __user *src)
387 {
388         struct snd_pcm_runtime *runtime = substream->runtime;
389         volatile struct snd_pcm_mmap_status *status;
390         volatile struct snd_pcm_mmap_control *control;
391         u32 sflags;
392         struct snd_pcm_mmap_control scontrol;
393         struct snd_pcm_mmap_status sstatus;
394         snd_pcm_uframes_t boundary;
395         int err;
396
397         if (snd_BUG_ON(!runtime))
398                 return -EINVAL;
399
400         if (get_user(sflags, &src->flags) ||
401             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
402             get_user(scontrol.avail_min, &src->c.control.avail_min))
403                 return -EFAULT;
404         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
405                 err = snd_pcm_hwsync(substream);
406                 if (err < 0)
407                         return err;
408         }
409         status = runtime->status;
410         control = runtime->control;
411         boundary = recalculate_boundary(runtime);
412         if (! boundary)
413                 boundary = 0x7fffffff;
414         snd_pcm_stream_lock_irq(substream);
415         /* FIXME: we should consider the boundary for the sync from app */
416         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
417                 control->appl_ptr = scontrol.appl_ptr;
418         else
419                 scontrol.appl_ptr = control->appl_ptr % boundary;
420         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
421                 control->avail_min = scontrol.avail_min;
422         else
423                 scontrol.avail_min = control->avail_min;
424         sstatus.state = status->state;
425         sstatus.hw_ptr = status->hw_ptr % boundary;
426         sstatus.tstamp = status->tstamp;
427         sstatus.suspended_state = status->suspended_state;
428         snd_pcm_stream_unlock_irq(substream);
429         if (put_user(sstatus.state, &src->s.status.state) ||
430             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
431             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) ||
432             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) ||
433             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
434             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
435             put_user(scontrol.avail_min, &src->c.control.avail_min))
436                 return -EFAULT;
437
438         return 0;
439 }
440
441
442 /*
443  */
444 enum {
445         SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
446         SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
447         SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
448         SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
449         SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
450         SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
451         SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
452         SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
453         SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
454         SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
455         SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
456         SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
457         SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),
458
459 };
460
461 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
462 {
463         struct snd_pcm_file *pcm_file;
464         struct snd_pcm_substream *substream;
465         void __user *argp = compat_ptr(arg);
466
467         pcm_file = file->private_data;
468         if (! pcm_file)
469                 return -ENOTTY;
470         substream = pcm_file->substream;
471         if (! substream)
472                 return -ENOTTY;
473
474         /*
475          * When PCM is used on 32bit mode, we need to disable
476          * mmap of PCM status/control records because of the size
477          * incompatibility.
478          */
479         pcm_file->no_compat_mmap = 1;
480
481         switch (cmd) {
482         case SNDRV_PCM_IOCTL_PVERSION:
483         case SNDRV_PCM_IOCTL_INFO:
484         case SNDRV_PCM_IOCTL_TSTAMP:
485         case SNDRV_PCM_IOCTL_TTSTAMP:
486         case SNDRV_PCM_IOCTL_HWSYNC:
487         case SNDRV_PCM_IOCTL_PREPARE:
488         case SNDRV_PCM_IOCTL_RESET:
489         case SNDRV_PCM_IOCTL_START:
490         case SNDRV_PCM_IOCTL_DROP:
491         case SNDRV_PCM_IOCTL_DRAIN:
492         case SNDRV_PCM_IOCTL_PAUSE:
493         case SNDRV_PCM_IOCTL_HW_FREE:
494         case SNDRV_PCM_IOCTL_RESUME:
495         case SNDRV_PCM_IOCTL_XRUN:
496         case SNDRV_PCM_IOCTL_LINK:
497         case SNDRV_PCM_IOCTL_UNLINK:
498                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
499                         return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
500                 else
501                         return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
502         case SNDRV_PCM_IOCTL_HW_REFINE32:
503                 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
504         case SNDRV_PCM_IOCTL_HW_PARAMS32:
505                 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
506         case SNDRV_PCM_IOCTL_SW_PARAMS32:
507                 return snd_pcm_ioctl_sw_params_compat(substream, argp);
508         case SNDRV_PCM_IOCTL_STATUS32:
509                 return snd_pcm_status_user_compat(substream, argp);
510         case SNDRV_PCM_IOCTL_SYNC_PTR32:
511                 return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
512         case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
513                 return snd_pcm_ioctl_channel_info_compat(substream, argp);
514         case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
515                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
516         case SNDRV_PCM_IOCTL_READI_FRAMES32:
517                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
518         case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
519                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
520         case SNDRV_PCM_IOCTL_READN_FRAMES32:
521                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
522         case SNDRV_PCM_IOCTL_DELAY32:
523                 return snd_pcm_ioctl_delay_compat(substream, argp);
524         case SNDRV_PCM_IOCTL_REWIND32:
525                 return snd_pcm_ioctl_rewind_compat(substream, argp);
526         case SNDRV_PCM_IOCTL_FORWARD32:
527                 return snd_pcm_ioctl_forward_compat(substream, argp);
528         }
529
530         return -ENOIOCTLCMD;
531 }