Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/sound/oss/dmasound/dmasound_core.c |
| 3 | * |
| 4 | * |
| 5 | * OSS/Free compatible Atari TT/Falcon and Amiga DMA sound driver for |
| 6 | * Linux/m68k |
| 7 | * Extended to support Power Macintosh for Linux/ppc by Paul Mackerras |
| 8 | * |
| 9 | * (c) 1995 by Michael Schlueter & Michael Marte |
| 10 | * |
| 11 | * Michael Schlueter (michael@duck.syd.de) did the basic structure of the VFS |
| 12 | * interface and the u-law to signed byte conversion. |
| 13 | * |
| 14 | * Michael Marte (marte@informatik.uni-muenchen.de) did the sound queue, |
| 15 | * /dev/mixer, /dev/sndstat and complemented the VFS interface. He would like |
| 16 | * to thank: |
| 17 | * - Michael Schlueter for initial ideas and documentation on the MFP and |
| 18 | * the DMA sound hardware. |
| 19 | * - Therapy? for their CD 'Troublegum' which really made me rock. |
| 20 | * |
| 21 | * /dev/sndstat is based on code by Hannu Savolainen, the author of the |
| 22 | * VoxWare family of drivers. |
| 23 | * |
| 24 | * This file is subject to the terms and conditions of the GNU General Public |
| 25 | * License. See the file COPYING in the main directory of this archive |
| 26 | * for more details. |
| 27 | * |
| 28 | * History: |
| 29 | * |
| 30 | * 1995/8/25 First release |
| 31 | * |
| 32 | * 1995/9/02 Roman Hodek: |
| 33 | * - Fixed atari_stram_alloc() call, the timer |
| 34 | * programming and several race conditions |
| 35 | * 1995/9/14 Roman Hodek: |
| 36 | * - After some discussion with Michael Schlueter, |
| 37 | * revised the interrupt disabling |
| 38 | * - Slightly speeded up U8->S8 translation by using |
| 39 | * long operations where possible |
| 40 | * - Added 4:3 interpolation for /dev/audio |
| 41 | * |
| 42 | * 1995/9/20 Torsten Scherer: |
| 43 | * - Fixed a bug in sq_write and changed /dev/audio |
| 44 | * converting to play at 12517Hz instead of 6258Hz. |
| 45 | * |
| 46 | * 1995/9/23 Torsten Scherer: |
| 47 | * - Changed sq_interrupt() and sq_play() to pre-program |
| 48 | * the DMA for another frame while there's still one |
| 49 | * running. This allows the IRQ response to be |
| 50 | * arbitrarily delayed and playing will still continue. |
| 51 | * |
| 52 | * 1995/10/14 Guenther Kelleter, Torsten Scherer: |
| 53 | * - Better support for Falcon audio (the Falcon doesn't |
| 54 | * raise an IRQ at the end of a frame, but at the |
| 55 | * beginning instead!). uses 'if (codec_dma)' in lots |
| 56 | * of places to simply switch between Falcon and TT |
| 57 | * code. |
| 58 | * |
| 59 | * 1995/11/06 Torsten Scherer: |
| 60 | * - Started introducing a hardware abstraction scheme |
| 61 | * (may perhaps also serve for Amigas?) |
| 62 | * - Can now play samples at almost all frequencies by |
| 63 | * means of a more generalized expand routine |
| 64 | * - Takes a good deal of care to cut data only at |
| 65 | * sample sizes |
| 66 | * - Buffer size is now a kernel runtime option |
| 67 | * - Implemented fsync() & several minor improvements |
| 68 | * Guenther Kelleter: |
| 69 | * - Useful hints and bug fixes |
| 70 | * - Cross-checked it for Falcons |
| 71 | * |
| 72 | * 1996/3/9 Geert Uytterhoeven: |
| 73 | * - Support added for Amiga, A-law, 16-bit little |
| 74 | * endian. |
| 75 | * - Unification to drivers/sound/dmasound.c. |
| 76 | * |
| 77 | * 1996/4/6 Martin Mitchell: |
| 78 | * - Updated to 1.3 kernel. |
| 79 | * |
| 80 | * 1996/6/13 Topi Kanerva: |
| 81 | * - Fixed things that were broken (mainly the amiga |
| 82 | * 14-bit routines) |
| 83 | * - /dev/sndstat shows now the real hardware frequency |
| 84 | * - The lowpass filter is disabled by default now |
| 85 | * |
| 86 | * 1996/9/25 Geert Uytterhoeven: |
| 87 | * - Modularization |
| 88 | * |
| 89 | * 1998/6/10 Andreas Schwab: |
| 90 | * - Converted to use sound_core |
| 91 | * |
| 92 | * 1999/12/28 Richard Zidlicky: |
| 93 | * - Added support for Q40 |
| 94 | * |
| 95 | * 2000/2/27 Geert Uytterhoeven: |
| 96 | * - Clean up and split the code into 4 parts: |
| 97 | * o dmasound_core: machine-independent code |
| 98 | * o dmasound_atari: Atari TT and Falcon support |
| 99 | * o dmasound_awacs: Apple PowerMac support |
| 100 | * o dmasound_paula: Amiga support |
| 101 | * |
| 102 | * 2000/3/25 Geert Uytterhoeven: |
| 103 | * - Integration of dmasound_q40 |
| 104 | * - Small clean ups |
| 105 | * |
| 106 | * 2001/01/26 [1.0] Iain Sandoe |
| 107 | * - make /dev/sndstat show revision & edition info. |
| 108 | * - since dmasound.mach.sq_setup() can fail on pmac |
| 109 | * its type has been changed to int and the returns |
| 110 | * are checked. |
| 111 | * [1.1] - stop missing translations from being called. |
| 112 | * 2001/02/08 [1.2] - remove unused translation tables & move machine- |
| 113 | * specific tables to low-level. |
| 114 | * - return correct info. for SNDCTL_DSP_GETFMTS. |
| 115 | * [1.3] - implement SNDCTL_DSP_GETCAPS fully. |
| 116 | * [1.4] - make /dev/sndstat text length usage deterministic. |
| 117 | * - make /dev/sndstat call to low-level |
| 118 | * dmasound.mach.state_info() pass max space to ll driver. |
| 119 | * - tidy startup banners and output info. |
| 120 | * [1.5] - tidy up a little (removed some unused #defines in |
| 121 | * dmasound.h) |
| 122 | * - fix up HAS_RECORD conditionalisation. |
| 123 | * - add record code in places it is missing... |
| 124 | * - change buf-sizes to bytes to allow < 1kb for pmac |
| 125 | * if user param entry is < 256 the value is taken to |
| 126 | * be in kb > 256 is taken to be in bytes. |
| 127 | * - make default buff/frag params conditional on |
| 128 | * machine to allow smaller values for pmac. |
| 129 | * - made the ioctls, read & write comply with the OSS |
| 130 | * rules on setting params. |
| 131 | * - added parsing of _setup() params for record. |
| 132 | * 2001/04/04 [1.6] - fix bug where sample rates higher than maximum were |
| 133 | * being reported as OK. |
| 134 | * - fix open() to return -EBUSY as per OSS doc. when |
| 135 | * audio is in use - this is independent of O_NOBLOCK. |
| 136 | * - fix bug where SNDCTL_DSP_POST was blocking. |
| 137 | */ |
| 138 | |
| 139 | /* Record capability notes 30/01/2001: |
| 140 | * At present these observations apply only to pmac LL driver (the only one |
| 141 | * that can do record, at present). However, if other LL drivers for machines |
| 142 | * with record are added they may apply. |
| 143 | * |
| 144 | * The fragment parameters for the record and play channels are separate. |
| 145 | * However, if the driver is opened O_RDWR there is no way (in the current OSS |
| 146 | * API) to specify their values independently for the record and playback |
| 147 | * channels. Since the only common factor between the input & output is the |
| 148 | * sample rate (on pmac) it should be possible to open /dev/dspX O_WRONLY and |
| 149 | * /dev/dspY O_RDONLY. The input & output channels could then have different |
| 150 | * characteristics (other than the first that sets sample rate claiming the |
| 151 | * right to set it for ever). As it stands, the format, channels, number of |
| 152 | * bits & sample rate are assumed to be common. In the future perhaps these |
| 153 | * should be the responsibility of the LL driver - and then if a card really |
| 154 | * does not share items between record & playback they can be specified |
| 155 | * separately. |
| 156 | */ |
| 157 | |
| 158 | /* Thread-safeness of shared_resources notes: 31/01/2001 |
| 159 | * If the user opens O_RDWR and then splits record & play between two threads |
| 160 | * both of which inherit the fd - and then starts changing things from both |
| 161 | * - we will have difficulty telling. |
| 162 | * |
| 163 | * It's bad application coding - but ... |
| 164 | * TODO: think about how to sort this out... without bogging everything down in |
| 165 | * semaphores. |
| 166 | * |
| 167 | * Similarly, the OSS spec says "all changes to parameters must be between |
| 168 | * open() and the first read() or write(). - and a bit later on (by |
| 169 | * implication) "between SNDCTL_DSP_RESET and the first read() or write() after |
| 170 | * it". If the app is multi-threaded and this rule is broken between threads |
| 171 | * we will have trouble spotting it - and the fault will be rather obscure :-( |
| 172 | * |
| 173 | * We will try and put out at least a kmsg if we see it happen... but I think |
| 174 | * it will be quite hard to trap it with an -EXXX return... because we can't |
| 175 | * see the fault until after the damage is done. |
| 176 | */ |
| 177 | |
| 178 | #include <linux/module.h> |
| 179 | #include <linux/slab.h> |
| 180 | #include <linux/sound.h> |
| 181 | #include <linux/init.h> |
| 182 | #include <linux/soundcard.h> |
| 183 | #include <linux/poll.h> |
| 184 | #include <linux/smp_lock.h> |
| 185 | |
| 186 | #include <asm/uaccess.h> |
| 187 | |
| 188 | #include "dmasound.h" |
| 189 | |
| 190 | #define DMASOUND_CORE_REVISION 1 |
| 191 | #define DMASOUND_CORE_EDITION 6 |
| 192 | |
| 193 | /* |
| 194 | * Declarations |
| 195 | */ |
| 196 | |
| 197 | int dmasound_catchRadius = 0; |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 198 | module_param(dmasound_catchRadius, int, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | static unsigned int numWriteBufs = DEFAULT_N_BUFFERS; |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 201 | module_param(numWriteBufs, int, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | static unsigned int writeBufSize = DEFAULT_BUFF_SIZE ; /* in bytes */ |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 203 | module_param(writeBufSize, int, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | MODULE_LICENSE("GPL"); |
| 206 | |
| 207 | #ifdef MODULE |
| 208 | static int sq_unit = -1; |
| 209 | static int mixer_unit = -1; |
| 210 | static int state_unit = -1; |
| 211 | static int irq_installed; |
| 212 | #endif /* MODULE */ |
| 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | /* control over who can modify resources shared between play/record */ |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 215 | static fmode_t shared_resource_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | static int shared_resources_initialised; |
| 217 | |
| 218 | /* |
| 219 | * Mid level stuff |
| 220 | */ |
| 221 | |
| 222 | struct sound_settings dmasound = { .lock = SPIN_LOCK_UNLOCKED }; |
| 223 | |
| 224 | static inline void sound_silence(void) |
| 225 | { |
| 226 | dmasound.mach.silence(); /* _MUST_ stop DMA */ |
| 227 | } |
| 228 | |
| 229 | static inline int sound_set_format(int format) |
| 230 | { |
| 231 | return dmasound.mach.setFormat(format); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | static int sound_set_speed(int speed) |
| 236 | { |
| 237 | if (speed < 0) |
| 238 | return dmasound.soft.speed; |
| 239 | |
| 240 | /* trap out-of-range speed settings. |
| 241 | at present we allow (arbitrarily) low rates - using soft |
| 242 | up-conversion - but we can't allow > max because there is |
| 243 | no soft down-conversion. |
| 244 | */ |
| 245 | if (dmasound.mach.max_dsp_speed && |
| 246 | (speed > dmasound.mach.max_dsp_speed)) |
| 247 | speed = dmasound.mach.max_dsp_speed ; |
| 248 | |
| 249 | dmasound.soft.speed = speed; |
| 250 | |
| 251 | if (dmasound.minDev == SND_DEV_DSP) |
| 252 | dmasound.dsp.speed = dmasound.soft.speed; |
| 253 | |
| 254 | return dmasound.soft.speed; |
| 255 | } |
| 256 | |
| 257 | static int sound_set_stereo(int stereo) |
| 258 | { |
| 259 | if (stereo < 0) |
| 260 | return dmasound.soft.stereo; |
| 261 | |
| 262 | stereo = !!stereo; /* should be 0 or 1 now */ |
| 263 | |
| 264 | dmasound.soft.stereo = stereo; |
| 265 | if (dmasound.minDev == SND_DEV_DSP) |
| 266 | dmasound.dsp.stereo = stereo; |
| 267 | |
| 268 | return stereo; |
| 269 | } |
| 270 | |
| 271 | static ssize_t sound_copy_translate(TRANS *trans, const u_char __user *userPtr, |
| 272 | size_t userCount, u_char frame[], |
| 273 | ssize_t *frameUsed, ssize_t frameLeft) |
| 274 | { |
| 275 | ssize_t (*ct_func)(const u_char __user *, size_t, u_char *, ssize_t *, ssize_t); |
| 276 | |
| 277 | switch (dmasound.soft.format) { |
| 278 | case AFMT_MU_LAW: |
| 279 | ct_func = trans->ct_ulaw; |
| 280 | break; |
| 281 | case AFMT_A_LAW: |
| 282 | ct_func = trans->ct_alaw; |
| 283 | break; |
| 284 | case AFMT_S8: |
| 285 | ct_func = trans->ct_s8; |
| 286 | break; |
| 287 | case AFMT_U8: |
| 288 | ct_func = trans->ct_u8; |
| 289 | break; |
| 290 | case AFMT_S16_BE: |
| 291 | ct_func = trans->ct_s16be; |
| 292 | break; |
| 293 | case AFMT_U16_BE: |
| 294 | ct_func = trans->ct_u16be; |
| 295 | break; |
| 296 | case AFMT_S16_LE: |
| 297 | ct_func = trans->ct_s16le; |
| 298 | break; |
| 299 | case AFMT_U16_LE: |
| 300 | ct_func = trans->ct_u16le; |
| 301 | break; |
| 302 | default: |
| 303 | return 0; |
| 304 | } |
| 305 | /* if the user has requested a non-existent translation don't try |
| 306 | to call it but just return 0 bytes moved |
| 307 | */ |
| 308 | if (ct_func) |
| 309 | return ct_func(userPtr, userCount, frame, frameUsed, frameLeft); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * /dev/mixer abstraction |
| 315 | */ |
| 316 | |
| 317 | static struct { |
| 318 | int busy; |
| 319 | int modify_counter; |
| 320 | } mixer; |
| 321 | |
| 322 | static int mixer_open(struct inode *inode, struct file *file) |
| 323 | { |
| 324 | if (!try_module_get(dmasound.mach.owner)) |
| 325 | return -ENODEV; |
| 326 | mixer.busy = 1; |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | static int mixer_release(struct inode *inode, struct file *file) |
| 331 | { |
| 332 | lock_kernel(); |
| 333 | mixer.busy = 0; |
| 334 | module_put(dmasound.mach.owner); |
| 335 | unlock_kernel(); |
| 336 | return 0; |
| 337 | } |
| 338 | static int mixer_ioctl(struct inode *inode, struct file *file, u_int cmd, |
| 339 | u_long arg) |
| 340 | { |
| 341 | if (_SIOC_DIR(cmd) & _SIOC_WRITE) |
| 342 | mixer.modify_counter++; |
| 343 | switch (cmd) { |
| 344 | case OSS_GETVERSION: |
| 345 | return IOCTL_OUT(arg, SOUND_VERSION); |
| 346 | case SOUND_MIXER_INFO: |
| 347 | { |
| 348 | mixer_info info; |
| 349 | memset(&info, 0, sizeof(info)); |
| 350 | strlcpy(info.id, dmasound.mach.name2, sizeof(info.id)); |
| 351 | strlcpy(info.name, dmasound.mach.name2, sizeof(info.name)); |
| 352 | info.modify_counter = mixer.modify_counter; |
| 353 | if (copy_to_user((void __user *)arg, &info, sizeof(info))) |
| 354 | return -EFAULT; |
| 355 | return 0; |
| 356 | } |
| 357 | } |
| 358 | if (dmasound.mach.mixer_ioctl) |
| 359 | return dmasound.mach.mixer_ioctl(cmd, arg); |
| 360 | return -EINVAL; |
| 361 | } |
| 362 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 363 | static const struct file_operations mixer_fops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | { |
| 365 | .owner = THIS_MODULE, |
| 366 | .llseek = no_llseek, |
| 367 | .ioctl = mixer_ioctl, |
| 368 | .open = mixer_open, |
| 369 | .release = mixer_release, |
| 370 | }; |
| 371 | |
| 372 | static void mixer_init(void) |
| 373 | { |
| 374 | #ifndef MODULE |
| 375 | int mixer_unit; |
| 376 | #endif |
| 377 | mixer_unit = register_sound_mixer(&mixer_fops, -1); |
| 378 | if (mixer_unit < 0) |
| 379 | return; |
| 380 | |
| 381 | mixer.busy = 0; |
| 382 | dmasound.treble = 0; |
| 383 | dmasound.bass = 0; |
| 384 | if (dmasound.mach.mixer_init) |
| 385 | dmasound.mach.mixer_init(); |
| 386 | } |
| 387 | |
| 388 | |
| 389 | /* |
| 390 | * Sound queue stuff, the heart of the driver |
| 391 | */ |
| 392 | |
| 393 | struct sound_queue dmasound_write_sq; |
| 394 | static void sq_reset_output(void) ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | static int sq_allocate_buffers(struct sound_queue *sq, int num, int size) |
| 397 | { |
| 398 | int i; |
| 399 | |
| 400 | if (sq->buffers) |
| 401 | return 0; |
| 402 | sq->numBufs = num; |
| 403 | sq->bufSize = size; |
| 404 | sq->buffers = kmalloc (num * sizeof(char *), GFP_KERNEL); |
| 405 | if (!sq->buffers) |
| 406 | return -ENOMEM; |
| 407 | for (i = 0; i < num; i++) { |
| 408 | sq->buffers[i] = dmasound.mach.dma_alloc(size, GFP_KERNEL); |
| 409 | if (!sq->buffers[i]) { |
| 410 | while (i--) |
| 411 | dmasound.mach.dma_free(sq->buffers[i], size); |
| 412 | kfree(sq->buffers); |
| 413 | sq->buffers = NULL; |
| 414 | return -ENOMEM; |
| 415 | } |
| 416 | } |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | static void sq_release_buffers(struct sound_queue *sq) |
| 421 | { |
| 422 | int i; |
| 423 | |
| 424 | if (sq->buffers) { |
| 425 | for (i = 0; i < sq->numBufs; i++) |
| 426 | dmasound.mach.dma_free(sq->buffers[i], sq->bufSize); |
| 427 | kfree(sq->buffers); |
| 428 | sq->buffers = NULL; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | |
| 433 | static int sq_setup(struct sound_queue *sq) |
| 434 | { |
| 435 | int (*setup_func)(void) = NULL; |
| 436 | int hard_frame ; |
| 437 | |
| 438 | if (sq->locked) { /* are we already set? - and not changeable */ |
| 439 | #ifdef DEBUG_DMASOUND |
| 440 | printk("dmasound_core: tried to sq_setup a locked queue\n") ; |
| 441 | #endif |
| 442 | return -EINVAL ; |
| 443 | } |
| 444 | sq->locked = 1 ; /* don't think we have a race prob. here _check_ */ |
| 445 | |
| 446 | /* make sure that the parameters are set up |
| 447 | This should have been done already... |
| 448 | */ |
| 449 | |
| 450 | dmasound.mach.init(); |
| 451 | |
| 452 | /* OK. If the user has set fragment parameters explicitly, then we |
| 453 | should leave them alone... as long as they are valid. |
| 454 | Invalid user fragment params can occur if we allow the whole buffer |
| 455 | to be used when the user requests the fragments sizes (with no soft |
| 456 | x-lation) and then the user subsequently sets a soft x-lation that |
| 457 | requires increased internal buffering. |
| 458 | |
| 459 | Othwerwise (if the user did not set them) OSS says that we should |
| 460 | select frag params on the basis of 0.5 s output & 0.1 s input |
| 461 | latency. (TODO. For now we will copy in the defaults.) |
| 462 | */ |
| 463 | |
| 464 | if (sq->user_frags <= 0) { |
| 465 | sq->max_count = sq->numBufs ; |
| 466 | sq->max_active = sq->numBufs ; |
| 467 | sq->block_size = sq->bufSize; |
| 468 | /* set up the user info */ |
| 469 | sq->user_frags = sq->numBufs ; |
| 470 | sq->user_frag_size = sq->bufSize ; |
| 471 | sq->user_frag_size *= |
| 472 | (dmasound.soft.size * (dmasound.soft.stereo+1) ) ; |
| 473 | sq->user_frag_size /= |
| 474 | (dmasound.hard.size * (dmasound.hard.stereo+1) ) ; |
| 475 | } else { |
| 476 | /* work out requested block size */ |
| 477 | sq->block_size = sq->user_frag_size ; |
| 478 | sq->block_size *= |
| 479 | (dmasound.hard.size * (dmasound.hard.stereo+1) ) ; |
| 480 | sq->block_size /= |
| 481 | (dmasound.soft.size * (dmasound.soft.stereo+1) ) ; |
| 482 | /* the user wants to write frag-size chunks */ |
| 483 | sq->block_size *= dmasound.hard.speed ; |
| 484 | sq->block_size /= dmasound.soft.speed ; |
| 485 | /* this only works for size values which are powers of 2 */ |
| 486 | hard_frame = |
| 487 | (dmasound.hard.size * (dmasound.hard.stereo+1))/8 ; |
| 488 | sq->block_size += (hard_frame - 1) ; |
| 489 | sq->block_size &= ~(hard_frame - 1) ; /* make sure we are aligned */ |
| 490 | /* let's just check for obvious mistakes */ |
| 491 | if ( sq->block_size <= 0 || sq->block_size > sq->bufSize) { |
| 492 | #ifdef DEBUG_DMASOUND |
| 493 | printk("dmasound_core: invalid frag size (user set %d)\n", sq->user_frag_size) ; |
| 494 | #endif |
| 495 | sq->block_size = sq->bufSize ; |
| 496 | } |
| 497 | if ( sq->user_frags <= sq->numBufs ) { |
| 498 | sq->max_count = sq->user_frags ; |
| 499 | /* if user has set max_active - then use it */ |
| 500 | sq->max_active = (sq->max_active <= sq->max_count) ? |
| 501 | sq->max_active : sq->max_count ; |
| 502 | } else { |
| 503 | #ifdef DEBUG_DMASOUND |
| 504 | printk("dmasound_core: invalid frag count (user set %d)\n", sq->user_frags) ; |
| 505 | #endif |
| 506 | sq->max_count = |
| 507 | sq->max_active = sq->numBufs ; |
| 508 | } |
| 509 | } |
| 510 | sq->front = sq->count = sq->rear_size = 0; |
| 511 | sq->syncing = 0; |
| 512 | sq->active = 0; |
| 513 | |
| 514 | if (sq == &write_sq) { |
| 515 | sq->rear = -1; |
| 516 | setup_func = dmasound.mach.write_sq_setup; |
| 517 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | if (setup_func) |
| 519 | return setup_func(); |
| 520 | return 0 ; |
| 521 | } |
| 522 | |
| 523 | static inline void sq_play(void) |
| 524 | { |
| 525 | dmasound.mach.play(); |
| 526 | } |
| 527 | |
| 528 | static ssize_t sq_write(struct file *file, const char __user *src, size_t uLeft, |
| 529 | loff_t *ppos) |
| 530 | { |
| 531 | ssize_t uWritten = 0; |
| 532 | u_char *dest; |
| 533 | ssize_t uUsed = 0, bUsed, bLeft; |
| 534 | unsigned long flags ; |
| 535 | |
| 536 | /* ++TeSche: Is something like this necessary? |
| 537 | * Hey, that's an honest question! Or does any other part of the |
| 538 | * filesystem already checks this situation? I really don't know. |
| 539 | */ |
| 540 | if (uLeft == 0) |
| 541 | return 0; |
| 542 | |
| 543 | /* implement any changes we have made to the soft/hard params. |
| 544 | this is not satisfactory really, all we have done up to now is to |
| 545 | say what we would like - there hasn't been any real checking of capability |
| 546 | */ |
| 547 | |
| 548 | if (shared_resources_initialised == 0) { |
| 549 | dmasound.mach.init() ; |
| 550 | shared_resources_initialised = 1 ; |
| 551 | } |
| 552 | |
| 553 | /* set up the sq if it is not already done. This may seem a dumb place |
| 554 | to do it - but it is what OSS requires. It means that write() can |
| 555 | return memory allocation errors. To avoid this possibility use the |
| 556 | GETBLKSIZE or GETOSPACE ioctls (after you've fiddled with all the |
| 557 | params you want to change) - these ioctls also force the setup. |
| 558 | */ |
| 559 | |
| 560 | if (write_sq.locked == 0) { |
| 561 | if ((uWritten = sq_setup(&write_sq)) < 0) return uWritten ; |
| 562 | uWritten = 0 ; |
| 563 | } |
| 564 | |
| 565 | /* FIXME: I think that this may be the wrong behaviour when we get strapped |
| 566 | for time and the cpu is close to being (or actually) behind in sending data. |
| 567 | - because we've lost the time that the N samples, already in the buffer, |
| 568 | would have given us to get here with the next lot from the user. |
| 569 | */ |
| 570 | /* The interrupt doesn't start to play the last, incomplete frame. |
| 571 | * Thus we can append to it without disabling the interrupts! (Note |
| 572 | * also that write_sq.rear isn't affected by the interrupt.) |
| 573 | */ |
| 574 | |
| 575 | /* as of 1.6 this behaviour changes if SNDCTL_DSP_POST has been issued: |
| 576 | this will mimic the behaviour of syncing and allow the sq_play() to |
| 577 | queue a partial fragment. Since sq_play() may/will be called from |
| 578 | the IRQ handler - at least on Pmac we have to deal with it. |
| 579 | The strategy - possibly not optimum - is to kill _POST status if we |
| 580 | get here. This seems, at least, reasonable - in the sense that POST |
| 581 | is supposed to indicate that we might not write before the queue |
| 582 | is drained - and if we get here in time then it does not apply. |
| 583 | */ |
| 584 | |
| 585 | spin_lock_irqsave(&dmasound.lock, flags); |
| 586 | write_sq.syncing &= ~2 ; /* take out POST status */ |
| 587 | spin_unlock_irqrestore(&dmasound.lock, flags); |
| 588 | |
| 589 | if (write_sq.count > 0 && |
| 590 | (bLeft = write_sq.block_size-write_sq.rear_size) > 0) { |
| 591 | dest = write_sq.buffers[write_sq.rear]; |
| 592 | bUsed = write_sq.rear_size; |
| 593 | uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft, |
| 594 | dest, &bUsed, bLeft); |
| 595 | if (uUsed <= 0) |
| 596 | return uUsed; |
| 597 | src += uUsed; |
| 598 | uWritten += uUsed; |
| 599 | uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */ |
| 600 | write_sq.rear_size = bUsed; |
| 601 | } |
| 602 | |
| 603 | while (uLeft) { |
| 604 | while (write_sq.count >= write_sq.max_active) { |
| 605 | sq_play(); |
Al Viro | 4b30fbd | 2008-11-01 18:19:49 +0000 | [diff] [blame] | 606 | if (write_sq.non_blocking) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | return uWritten > 0 ? uWritten : -EAGAIN; |
| 608 | SLEEP(write_sq.action_queue); |
| 609 | if (signal_pending(current)) |
| 610 | return uWritten > 0 ? uWritten : -EINTR; |
| 611 | } |
| 612 | |
| 613 | /* Here, we can avoid disabling the interrupt by first |
| 614 | * copying and translating the data, and then updating |
| 615 | * the write_sq variables. Until this is done, the interrupt |
| 616 | * won't see the new frame and we can work on it |
| 617 | * undisturbed. |
| 618 | */ |
| 619 | |
| 620 | dest = write_sq.buffers[(write_sq.rear+1) % write_sq.max_count]; |
| 621 | bUsed = 0; |
| 622 | bLeft = write_sq.block_size; |
| 623 | uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft, |
| 624 | dest, &bUsed, bLeft); |
| 625 | if (uUsed <= 0) |
| 626 | break; |
| 627 | src += uUsed; |
| 628 | uWritten += uUsed; |
| 629 | uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */ |
| 630 | if (bUsed) { |
| 631 | write_sq.rear = (write_sq.rear+1) % write_sq.max_count; |
| 632 | write_sq.rear_size = bUsed; |
| 633 | write_sq.count++; |
| 634 | } |
| 635 | } /* uUsed may have been 0 */ |
| 636 | |
| 637 | sq_play(); |
| 638 | |
| 639 | return uUsed < 0? uUsed: uWritten; |
| 640 | } |
| 641 | |
| 642 | static unsigned int sq_poll(struct file *file, struct poll_table_struct *wait) |
| 643 | { |
| 644 | unsigned int mask = 0; |
| 645 | int retVal; |
| 646 | |
| 647 | if (write_sq.locked == 0) { |
| 648 | if ((retVal = sq_setup(&write_sq)) < 0) |
| 649 | return retVal; |
| 650 | return 0; |
| 651 | } |
| 652 | if (file->f_mode & FMODE_WRITE ) |
| 653 | poll_wait(file, &write_sq.action_queue, wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | if (file->f_mode & FMODE_WRITE) |
| 655 | if (write_sq.count < write_sq.max_active || write_sq.block_size - write_sq.rear_size > 0) |
| 656 | mask |= POLLOUT | POLLWRNORM; |
| 657 | return mask; |
| 658 | |
| 659 | } |
| 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | static inline void sq_init_waitqueue(struct sound_queue *sq) |
| 662 | { |
| 663 | init_waitqueue_head(&sq->action_queue); |
| 664 | init_waitqueue_head(&sq->open_queue); |
| 665 | init_waitqueue_head(&sq->sync_queue); |
| 666 | sq->busy = 0; |
| 667 | } |
| 668 | |
| 669 | #if 0 /* blocking open() */ |
| 670 | static inline void sq_wake_up(struct sound_queue *sq, struct file *file, |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 671 | fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
| 673 | if (file->f_mode & mode) { |
| 674 | sq->busy = 0; /* CHECK: IS THIS OK??? */ |
| 675 | WAKE_UP(sq->open_queue); |
| 676 | } |
| 677 | } |
| 678 | #endif |
| 679 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 680 | static int sq_open2(struct sound_queue *sq, struct file *file, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | int numbufs, int bufsize) |
| 682 | { |
| 683 | int rc = 0; |
| 684 | |
| 685 | if (file->f_mode & mode) { |
| 686 | if (sq->busy) { |
| 687 | #if 0 /* blocking open() */ |
| 688 | rc = -EBUSY; |
| 689 | if (file->f_flags & O_NONBLOCK) |
| 690 | return rc; |
| 691 | rc = -EINTR; |
| 692 | while (sq->busy) { |
| 693 | SLEEP(sq->open_queue); |
| 694 | if (signal_pending(current)) |
| 695 | return rc; |
| 696 | } |
| 697 | rc = 0; |
| 698 | #else |
| 699 | /* OSS manual says we will return EBUSY regardless |
| 700 | of O_NOBLOCK. |
| 701 | */ |
| 702 | return -EBUSY ; |
| 703 | #endif |
| 704 | } |
| 705 | sq->busy = 1; /* Let's play spot-the-race-condition */ |
| 706 | |
| 707 | /* allocate the default number & size of buffers. |
| 708 | (i.e. specified in _setup() or as module params) |
| 709 | can't be changed at the moment - but _could_ be perhaps |
| 710 | in the setfragments ioctl. |
| 711 | */ |
| 712 | if (( rc = sq_allocate_buffers(sq, numbufs, bufsize))) { |
| 713 | #if 0 /* blocking open() */ |
| 714 | sq_wake_up(sq, file, mode); |
| 715 | #else |
| 716 | sq->busy = 0 ; |
| 717 | #endif |
| 718 | return rc; |
| 719 | } |
| 720 | |
Al Viro | 4b30fbd | 2008-11-01 18:19:49 +0000 | [diff] [blame] | 721 | sq->non_blocking = file->f_flags & O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
| 723 | return rc; |
| 724 | } |
| 725 | |
| 726 | #define write_sq_init_waitqueue() sq_init_waitqueue(&write_sq) |
| 727 | #if 0 /* blocking open() */ |
| 728 | #define write_sq_wake_up(file) sq_wake_up(&write_sq, file, FMODE_WRITE) |
| 729 | #endif |
| 730 | #define write_sq_release_buffers() sq_release_buffers(&write_sq) |
| 731 | #define write_sq_open(file) \ |
| 732 | sq_open2(&write_sq, file, FMODE_WRITE, numWriteBufs, writeBufSize ) |
| 733 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | static int sq_open(struct inode *inode, struct file *file) |
| 735 | { |
| 736 | int rc; |
| 737 | |
| 738 | if (!try_module_get(dmasound.mach.owner)) |
| 739 | return -ENODEV; |
| 740 | |
| 741 | rc = write_sq_open(file); /* checks the f_mode */ |
| 742 | if (rc) |
| 743 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | if (file->f_mode & FMODE_READ) { |
| 745 | /* TODO: if O_RDWR, release any resources grabbed by write part */ |
| 746 | rc = -ENXIO ; /* I think this is what is required by open(2) */ |
| 747 | goto out; |
| 748 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | if (dmasound.mach.sq_open) |
| 751 | dmasound.mach.sq_open(file->f_mode); |
| 752 | |
| 753 | /* CHECK whether this is sensible - in the case that dsp0 could be opened |
| 754 | O_RDONLY and dsp1 could be opened O_WRONLY |
| 755 | */ |
| 756 | |
| 757 | dmasound.minDev = iminor(inode) & 0x0f; |
| 758 | |
| 759 | /* OK. - we should make some attempt at consistency. At least the H'ware |
| 760 | options should be set with a valid mode. We will make it that the LL |
| 761 | driver must supply defaults for hard & soft params. |
| 762 | */ |
| 763 | |
| 764 | if (shared_resource_owner == 0) { |
| 765 | /* you can make this AFMT_U8/mono/8K if you want to mimic old |
| 766 | OSS behaviour - while we still have soft translations ;-) */ |
| 767 | dmasound.soft = dmasound.mach.default_soft ; |
| 768 | dmasound.dsp = dmasound.mach.default_soft ; |
| 769 | dmasound.hard = dmasound.mach.default_hard ; |
| 770 | } |
| 771 | |
| 772 | #ifndef DMASOUND_STRICT_OSS_COMPLIANCE |
| 773 | /* none of the current LL drivers can actually do this "native" at the moment |
| 774 | OSS does not really require us to supply /dev/audio if we can't do it. |
| 775 | */ |
| 776 | if (dmasound.minDev == SND_DEV_AUDIO) { |
| 777 | sound_set_speed(8000); |
| 778 | sound_set_stereo(0); |
| 779 | sound_set_format(AFMT_MU_LAW); |
| 780 | } |
| 781 | #endif |
| 782 | |
| 783 | return 0; |
| 784 | out: |
| 785 | module_put(dmasound.mach.owner); |
| 786 | return rc; |
| 787 | } |
| 788 | |
| 789 | static void sq_reset_output(void) |
| 790 | { |
| 791 | sound_silence(); /* this _must_ stop DMA, we might be about to lose the buffers */ |
| 792 | write_sq.active = 0; |
| 793 | write_sq.count = 0; |
| 794 | write_sq.rear_size = 0; |
| 795 | /* write_sq.front = (write_sq.rear+1) % write_sq.max_count;*/ |
| 796 | write_sq.front = 0 ; |
| 797 | write_sq.rear = -1 ; /* same as for set-up */ |
| 798 | |
| 799 | /* OK - we can unlock the parameters and fragment settings */ |
| 800 | write_sq.locked = 0 ; |
| 801 | write_sq.user_frags = 0 ; |
| 802 | write_sq.user_frag_size = 0 ; |
| 803 | } |
| 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | static void sq_reset(void) |
| 806 | { |
| 807 | sq_reset_output() ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | /* we could consider resetting the shared_resources_owner here... but I |
| 809 | think it is probably still rather non-obvious to application writer |
| 810 | */ |
| 811 | |
| 812 | /* we release everything else though */ |
| 813 | shared_resources_initialised = 0 ; |
| 814 | } |
| 815 | |
| 816 | static int sq_fsync(struct file *filp, struct dentry *dentry) |
| 817 | { |
| 818 | int rc = 0; |
| 819 | int timeout = 5; |
| 820 | |
| 821 | write_sq.syncing |= 1; |
| 822 | sq_play(); /* there may be an incomplete frame waiting */ |
| 823 | |
| 824 | while (write_sq.active) { |
| 825 | SLEEP(write_sq.sync_queue); |
| 826 | if (signal_pending(current)) { |
| 827 | /* While waiting for audio output to drain, an |
| 828 | * interrupt occurred. Stop audio output immediately |
| 829 | * and clear the queue. */ |
| 830 | sq_reset_output(); |
| 831 | rc = -EINTR; |
| 832 | break; |
| 833 | } |
| 834 | if (!--timeout) { |
| 835 | printk(KERN_WARNING "dmasound: Timeout draining output\n"); |
| 836 | sq_reset_output(); |
| 837 | rc = -EIO; |
| 838 | break; |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | /* flag no sync regardless of whether we had a DSP_POST or not */ |
| 843 | write_sq.syncing = 0 ; |
| 844 | return rc; |
| 845 | } |
| 846 | |
| 847 | static int sq_release(struct inode *inode, struct file *file) |
| 848 | { |
| 849 | int rc = 0; |
| 850 | |
| 851 | lock_kernel(); |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | if (file->f_mode & FMODE_WRITE) { |
| 854 | if (write_sq.busy) |
Josef Sipek | 7bc5632 | 2006-12-08 02:37:40 -0800 | [diff] [blame] | 855 | rc = sq_fsync(file, file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
| 857 | sq_reset_output() ; /* make sure dma is stopped and all is quiet */ |
| 858 | write_sq_release_buffers(); |
| 859 | write_sq.busy = 0; |
| 860 | } |
| 861 | |
| 862 | if (file->f_mode & shared_resource_owner) { /* it's us that has them */ |
| 863 | shared_resource_owner = 0 ; |
| 864 | shared_resources_initialised = 0 ; |
| 865 | dmasound.hard = dmasound.mach.default_hard ; |
| 866 | } |
| 867 | |
| 868 | module_put(dmasound.mach.owner); |
| 869 | |
| 870 | #if 0 /* blocking open() */ |
| 871 | /* Wake up a process waiting for the queue being released. |
| 872 | * Note: There may be several processes waiting for a call |
| 873 | * to open() returning. */ |
| 874 | |
| 875 | /* Iain: hmm I don't understand this next comment ... */ |
| 876 | /* There is probably a DOS atack here. They change the mode flag. */ |
| 877 | /* XXX add check here,*/ |
| 878 | read_sq_wake_up(file); /* checks f_mode */ |
| 879 | write_sq_wake_up(file); /* checks f_mode */ |
| 880 | #endif /* blocking open() */ |
| 881 | |
| 882 | unlock_kernel(); |
| 883 | |
| 884 | return rc; |
| 885 | } |
| 886 | |
| 887 | /* here we see if we have a right to modify format, channels, size and so on |
| 888 | if no-one else has claimed it already then we do... |
| 889 | |
| 890 | TODO: We might change this to mask O_RDWR such that only one or the other channel |
| 891 | is the owner - if we have problems. |
| 892 | */ |
| 893 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 894 | static int shared_resources_are_mine(fmode_t md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | { |
| 896 | if (shared_resource_owner) |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 897 | return (shared_resource_owner & md) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | else { |
| 899 | shared_resource_owner = md ; |
| 900 | return 1 ; |
| 901 | } |
| 902 | } |
| 903 | |
| 904 | /* if either queue is locked we must deny the right to change shared params |
| 905 | */ |
| 906 | |
| 907 | static int queues_are_quiescent(void) |
| 908 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | if (write_sq.locked) |
| 910 | return 0 ; |
| 911 | return 1 ; |
| 912 | } |
| 913 | |
| 914 | /* check and set a queue's fragments per user's wishes... |
| 915 | we will check against the pre-defined literals and the actual sizes. |
| 916 | This is a bit fraught - because soft translations can mess with our |
| 917 | buffer requirements *after* this call - OSS says "call setfrags first" |
| 918 | */ |
| 919 | |
| 920 | /* It is possible to replace all the -EINVAL returns with an override that |
| 921 | just puts the allowable value in. This may be what many OSS apps require |
| 922 | */ |
| 923 | |
| 924 | static int set_queue_frags(struct sound_queue *sq, int bufs, int size) |
| 925 | { |
| 926 | if (sq->locked) { |
| 927 | #ifdef DEBUG_DMASOUND |
| 928 | printk("dmasound_core: tried to set_queue_frags on a locked queue\n") ; |
| 929 | #endif |
| 930 | return -EINVAL ; |
| 931 | } |
| 932 | |
| 933 | if ((size < MIN_FRAG_SIZE) || (size > MAX_FRAG_SIZE)) |
| 934 | return -EINVAL ; |
| 935 | size = (1<<size) ; /* now in bytes */ |
| 936 | if (size > sq->bufSize) |
| 937 | return -EINVAL ; /* this might still not work */ |
| 938 | |
| 939 | if (bufs <= 0) |
| 940 | return -EINVAL ; |
| 941 | if (bufs > sq->numBufs) /* the user is allowed say "don't care" with 0x7fff */ |
| 942 | bufs = sq->numBufs ; |
| 943 | |
| 944 | /* there is, currently, no way to specify max_active separately |
| 945 | from max_count. This could be a LL driver issue - I guess |
| 946 | if there is a requirement for these values to be different then |
| 947 | we will have to pass that info. up to this level. |
| 948 | */ |
| 949 | sq->user_frags = |
| 950 | sq->max_active = bufs ; |
| 951 | sq->user_frag_size = size ; |
| 952 | |
| 953 | return 0 ; |
| 954 | } |
| 955 | |
| 956 | static int sq_ioctl(struct inode *inode, struct file *file, u_int cmd, |
| 957 | u_long arg) |
| 958 | { |
| 959 | int val, result; |
| 960 | u_long fmt; |
| 961 | int data; |
| 962 | int size, nbufs; |
| 963 | audio_buf_info info; |
| 964 | |
| 965 | switch (cmd) { |
| 966 | case SNDCTL_DSP_RESET: |
| 967 | sq_reset(); |
| 968 | return 0; |
| 969 | break ; |
| 970 | case SNDCTL_DSP_GETFMTS: |
| 971 | fmt = dmasound.mach.hardware_afmts ; /* this is what OSS says.. */ |
| 972 | return IOCTL_OUT(arg, fmt); |
| 973 | break ; |
| 974 | case SNDCTL_DSP_GETBLKSIZE: |
| 975 | /* this should tell the caller about bytes that the app can |
| 976 | read/write - the app doesn't care about our internal buffers. |
| 977 | We force sq_setup() here as per OSS 1.1 (which should |
| 978 | compute the values necessary). |
| 979 | Since there is no mechanism to specify read/write separately, for |
| 980 | fds opened O_RDWR, the write_sq values will, arbitrarily, overwrite |
| 981 | the read_sq ones. |
| 982 | */ |
| 983 | size = 0 ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | if (file->f_mode & FMODE_WRITE) { |
| 985 | if ( !write_sq.locked ) |
| 986 | sq_setup(&write_sq) ; |
| 987 | size = write_sq.user_frag_size ; |
| 988 | } |
| 989 | return IOCTL_OUT(arg, size); |
| 990 | break ; |
| 991 | case SNDCTL_DSP_POST: |
| 992 | /* all we are going to do is to tell the LL that any |
| 993 | partial frags can be queued for output. |
| 994 | The LL will have to clear this flag when last output |
| 995 | is queued. |
| 996 | */ |
| 997 | write_sq.syncing |= 0x2 ; |
| 998 | sq_play() ; |
| 999 | return 0 ; |
| 1000 | case SNDCTL_DSP_SYNC: |
| 1001 | /* This call, effectively, has the same behaviour as SNDCTL_DSP_RESET |
| 1002 | except that it waits for output to finish before resetting |
| 1003 | everything - read, however, is killed imediately. |
| 1004 | */ |
| 1005 | result = 0 ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | if (file->f_mode & FMODE_WRITE) { |
Josef Sipek | 7bc5632 | 2006-12-08 02:37:40 -0800 | [diff] [blame] | 1007 | result = sq_fsync(file, file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | sq_reset_output() ; |
| 1009 | } |
| 1010 | /* if we are the shared resource owner then release them */ |
| 1011 | if (file->f_mode & shared_resource_owner) |
| 1012 | shared_resources_initialised = 0 ; |
| 1013 | return result ; |
| 1014 | break ; |
| 1015 | case SOUND_PCM_READ_RATE: |
| 1016 | return IOCTL_OUT(arg, dmasound.soft.speed); |
| 1017 | case SNDCTL_DSP_SPEED: |
| 1018 | /* changing this on the fly will have weird effects on the sound. |
| 1019 | Where there are rate conversions implemented in soft form - it |
| 1020 | will cause the _ctx_xxx() functions to be substituted. |
| 1021 | However, there doesn't appear to be any reason to dis-allow it from |
| 1022 | a driver pov. |
| 1023 | */ |
| 1024 | if (shared_resources_are_mine(file->f_mode)) { |
| 1025 | IOCTL_IN(arg, data); |
| 1026 | data = sound_set_speed(data) ; |
| 1027 | shared_resources_initialised = 0 ; |
| 1028 | return IOCTL_OUT(arg, data); |
| 1029 | } else |
| 1030 | return -EINVAL ; |
| 1031 | break ; |
| 1032 | /* OSS says these next 4 actions are undefined when the device is |
| 1033 | busy/active - we will just return -EINVAL. |
| 1034 | To be allowed to change one - (a) you have to own the right |
| 1035 | (b) the queue(s) must be quiescent |
| 1036 | */ |
| 1037 | case SNDCTL_DSP_STEREO: |
| 1038 | if (shared_resources_are_mine(file->f_mode) && |
| 1039 | queues_are_quiescent()) { |
| 1040 | IOCTL_IN(arg, data); |
| 1041 | shared_resources_initialised = 0 ; |
| 1042 | return IOCTL_OUT(arg, sound_set_stereo(data)); |
| 1043 | } else |
| 1044 | return -EINVAL ; |
| 1045 | break ; |
| 1046 | case SOUND_PCM_WRITE_CHANNELS: |
| 1047 | if (shared_resources_are_mine(file->f_mode) && |
| 1048 | queues_are_quiescent()) { |
| 1049 | IOCTL_IN(arg, data); |
| 1050 | /* the user might ask for 20 channels, we will return 1 or 2 */ |
| 1051 | shared_resources_initialised = 0 ; |
| 1052 | return IOCTL_OUT(arg, sound_set_stereo(data-1)+1); |
| 1053 | } else |
| 1054 | return -EINVAL ; |
| 1055 | break ; |
| 1056 | case SNDCTL_DSP_SETFMT: |
| 1057 | if (shared_resources_are_mine(file->f_mode) && |
| 1058 | queues_are_quiescent()) { |
| 1059 | int format; |
| 1060 | IOCTL_IN(arg, data); |
| 1061 | shared_resources_initialised = 0 ; |
| 1062 | format = sound_set_format(data); |
| 1063 | result = IOCTL_OUT(arg, format); |
| 1064 | if (result < 0) |
| 1065 | return result; |
| 1066 | if (format != data && data != AFMT_QUERY) |
| 1067 | return -EINVAL; |
| 1068 | return 0; |
| 1069 | } else |
| 1070 | return -EINVAL ; |
| 1071 | case SNDCTL_DSP_SUBDIVIDE: |
| 1072 | return -EINVAL ; |
| 1073 | case SNDCTL_DSP_SETFRAGMENT: |
| 1074 | /* we can do this independently for the two queues - with the |
| 1075 | proviso that for fds opened O_RDWR we cannot separate the |
| 1076 | actions and both queues will be set per the last call. |
| 1077 | NOTE: this does *NOT* actually set the queue up - merely |
| 1078 | registers our intentions. |
| 1079 | */ |
| 1080 | IOCTL_IN(arg, data); |
| 1081 | result = 0 ; |
| 1082 | nbufs = (data >> 16) & 0x7fff ; /* 0x7fff is 'use maximum' */ |
| 1083 | size = data & 0xffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | if (file->f_mode & FMODE_WRITE) { |
| 1085 | result = set_queue_frags(&write_sq, nbufs, size) ; |
| 1086 | if (result) |
| 1087 | return result ; |
| 1088 | } |
| 1089 | /* NOTE: this return value is irrelevant - OSS specifically says that |
| 1090 | the value is 'random' and that the user _must_ check the actual |
| 1091 | frags values using SNDCTL_DSP_GETBLKSIZE or similar */ |
| 1092 | return IOCTL_OUT(arg, data); |
| 1093 | break ; |
| 1094 | case SNDCTL_DSP_GETOSPACE: |
| 1095 | /* |
| 1096 | */ |
| 1097 | if (file->f_mode & FMODE_WRITE) { |
| 1098 | if ( !write_sq.locked ) |
| 1099 | sq_setup(&write_sq) ; |
| 1100 | info.fragments = write_sq.max_active - write_sq.count; |
| 1101 | info.fragstotal = write_sq.max_active; |
| 1102 | info.fragsize = write_sq.user_frag_size; |
| 1103 | info.bytes = info.fragments * info.fragsize; |
| 1104 | if (copy_to_user((void __user *)arg, &info, sizeof(info))) |
| 1105 | return -EFAULT; |
| 1106 | return 0; |
| 1107 | } else |
| 1108 | return -EINVAL ; |
| 1109 | break ; |
| 1110 | case SNDCTL_DSP_GETCAPS: |
| 1111 | val = dmasound.mach.capabilities & 0xffffff00; |
| 1112 | return IOCTL_OUT(arg,val); |
| 1113 | |
| 1114 | default: |
| 1115 | return mixer_ioctl(inode, file, cmd, arg); |
| 1116 | } |
| 1117 | return -EINVAL; |
| 1118 | } |
| 1119 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 1120 | static const struct file_operations sq_fops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | { |
| 1122 | .owner = THIS_MODULE, |
| 1123 | .llseek = no_llseek, |
| 1124 | .write = sq_write, |
| 1125 | .poll = sq_poll, |
| 1126 | .ioctl = sq_ioctl, |
| 1127 | .open = sq_open, |
| 1128 | .release = sq_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | }; |
| 1130 | |
| 1131 | static int sq_init(void) |
| 1132 | { |
Al Viro | d8b3966 | 2007-03-14 09:04:31 +0000 | [diff] [blame] | 1133 | const struct file_operations *fops = &sq_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | #ifndef MODULE |
| 1135 | int sq_unit; |
| 1136 | #endif |
| 1137 | |
Al Viro | d8b3966 | 2007-03-14 09:04:31 +0000 | [diff] [blame] | 1138 | sq_unit = register_sound_dsp(fops, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | if (sq_unit < 0) { |
| 1140 | printk(KERN_ERR "dmasound_core: couldn't register fops\n") ; |
| 1141 | return sq_unit ; |
| 1142 | } |
| 1143 | |
| 1144 | write_sq_init_waitqueue(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | /* These parameters will be restored for every clean open() |
| 1147 | * in the case of multiple open()s (e.g. dsp0 & dsp1) they |
| 1148 | * will be set so long as the shared resources have no owner. |
| 1149 | */ |
| 1150 | |
| 1151 | if (shared_resource_owner == 0) { |
| 1152 | dmasound.soft = dmasound.mach.default_soft ; |
| 1153 | dmasound.hard = dmasound.mach.default_hard ; |
| 1154 | dmasound.dsp = dmasound.mach.default_soft ; |
| 1155 | shared_resources_initialised = 0 ; |
| 1156 | } |
| 1157 | return 0 ; |
| 1158 | } |
| 1159 | |
| 1160 | |
| 1161 | /* |
| 1162 | * /dev/sndstat |
| 1163 | */ |
| 1164 | |
| 1165 | /* we allow more space for record-enabled because there are extra output lines. |
| 1166 | the number here must include the amount we are prepared to give to the low-level |
| 1167 | driver. |
| 1168 | */ |
| 1169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | #define STAT_BUFF_LEN 768 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | |
| 1172 | /* this is how much space we will allow the low-level driver to use |
| 1173 | in the stat buffer. Currently, 2 * (80 character line + <NL>). |
| 1174 | We do not police this (it is up to the ll driver to be honest). |
| 1175 | */ |
| 1176 | |
| 1177 | #define LOW_LEVEL_STAT_ALLOC 162 |
| 1178 | |
| 1179 | static struct { |
| 1180 | int busy; |
| 1181 | char buf[STAT_BUFF_LEN]; /* state.buf should not overflow! */ |
| 1182 | int len, ptr; |
| 1183 | } state; |
| 1184 | |
| 1185 | /* publish this function for use by low-level code, if required */ |
| 1186 | |
Adrian Bunk | 0a1b42d | 2008-06-10 01:26:28 +0300 | [diff] [blame] | 1187 | static char *get_afmt_string(int afmt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | { |
| 1189 | switch(afmt) { |
| 1190 | case AFMT_MU_LAW: |
| 1191 | return "mu-law"; |
| 1192 | break; |
| 1193 | case AFMT_A_LAW: |
| 1194 | return "A-law"; |
| 1195 | break; |
| 1196 | case AFMT_U8: |
| 1197 | return "unsigned 8 bit"; |
| 1198 | break; |
| 1199 | case AFMT_S8: |
| 1200 | return "signed 8 bit"; |
| 1201 | break; |
| 1202 | case AFMT_S16_BE: |
| 1203 | return "signed 16 bit BE"; |
| 1204 | break; |
| 1205 | case AFMT_U16_BE: |
| 1206 | return "unsigned 16 bit BE"; |
| 1207 | break; |
| 1208 | case AFMT_S16_LE: |
| 1209 | return "signed 16 bit LE"; |
| 1210 | break; |
| 1211 | case AFMT_U16_LE: |
| 1212 | return "unsigned 16 bit LE"; |
| 1213 | break; |
| 1214 | case 0: |
| 1215 | return "format not set" ; |
| 1216 | break ; |
| 1217 | default: |
| 1218 | break ; |
| 1219 | } |
| 1220 | return "ERROR: Unsupported AFMT_XXXX code" ; |
| 1221 | } |
| 1222 | |
| 1223 | static int state_open(struct inode *inode, struct file *file) |
| 1224 | { |
| 1225 | char *buffer = state.buf; |
| 1226 | int len = 0; |
| 1227 | |
| 1228 | if (state.busy) |
| 1229 | return -EBUSY; |
| 1230 | |
| 1231 | if (!try_module_get(dmasound.mach.owner)) |
| 1232 | return -ENODEV; |
| 1233 | state.ptr = 0; |
| 1234 | state.busy = 1; |
| 1235 | |
| 1236 | len += sprintf(buffer+len, "%sDMA sound driver rev %03d :\n", |
| 1237 | dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) + |
| 1238 | ((dmasound.mach.version>>8) & 0x0f)); |
| 1239 | len += sprintf(buffer+len, |
| 1240 | "Core driver edition %02d.%02d : %s driver edition %02d.%02d\n", |
| 1241 | DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2, |
| 1242 | (dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ; |
| 1243 | |
| 1244 | /* call the low-level module to fill in any stat info. that it has |
| 1245 | if present. Maximum buffer usage is specified. |
| 1246 | */ |
| 1247 | |
| 1248 | if (dmasound.mach.state_info) |
| 1249 | len += dmasound.mach.state_info(buffer+len, |
| 1250 | (size_t) LOW_LEVEL_STAT_ALLOC) ; |
| 1251 | |
| 1252 | /* make usage of the state buffer as deterministic as poss. |
| 1253 | exceptional conditions could cause overrun - and this is flagged as |
| 1254 | a kernel error. |
| 1255 | */ |
| 1256 | |
| 1257 | /* formats and settings */ |
| 1258 | |
| 1259 | len += sprintf(buffer+len,"\t\t === Formats & settings ===\n") ; |
| 1260 | len += sprintf(buffer+len,"Parameter %20s%20s\n","soft","hard") ; |
| 1261 | len += sprintf(buffer+len,"Format :%20s%20s\n", |
| 1262 | get_afmt_string(dmasound.soft.format), |
| 1263 | get_afmt_string(dmasound.hard.format)); |
| 1264 | |
| 1265 | len += sprintf(buffer+len,"Samp Rate:%14d s/sec%14d s/sec\n", |
| 1266 | dmasound.soft.speed, dmasound.hard.speed); |
| 1267 | |
| 1268 | len += sprintf(buffer+len,"Channels :%20s%20s\n", |
| 1269 | dmasound.soft.stereo ? "stereo" : "mono", |
| 1270 | dmasound.hard.stereo ? "stereo" : "mono" ); |
| 1271 | |
| 1272 | /* sound queue status */ |
| 1273 | |
| 1274 | len += sprintf(buffer+len,"\t\t === Sound Queue status ===\n"); |
| 1275 | len += sprintf(buffer+len,"Allocated:%8s%6s\n","Buffers","Size") ; |
| 1276 | len += sprintf(buffer+len,"%9s:%8d%6d\n", |
| 1277 | "write", write_sq.numBufs, write_sq.bufSize) ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | len += sprintf(buffer+len, |
| 1279 | "Current : MaxFrg FragSiz MaxAct Frnt Rear " |
| 1280 | "Cnt RrSize A B S L xruns\n") ; |
| 1281 | len += sprintf(buffer+len,"%9s:%7d%8d%7d%5d%5d%4d%7d%2d%2d%2d%2d%7d\n", |
| 1282 | "write", write_sq.max_count, write_sq.block_size, |
| 1283 | write_sq.max_active, write_sq.front, write_sq.rear, |
| 1284 | write_sq.count, write_sq.rear_size, write_sq.active, |
| 1285 | write_sq.busy, write_sq.syncing, write_sq.locked, write_sq.xruns) ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | #ifdef DEBUG_DMASOUND |
| 1287 | printk("dmasound: stat buffer used %d bytes\n", len) ; |
| 1288 | #endif |
| 1289 | |
| 1290 | if (len >= STAT_BUFF_LEN) |
| 1291 | printk(KERN_ERR "dmasound_core: stat buffer overflowed!\n"); |
| 1292 | |
| 1293 | state.len = len; |
| 1294 | return 0; |
| 1295 | } |
| 1296 | |
| 1297 | static int state_release(struct inode *inode, struct file *file) |
| 1298 | { |
| 1299 | lock_kernel(); |
| 1300 | state.busy = 0; |
| 1301 | module_put(dmasound.mach.owner); |
| 1302 | unlock_kernel(); |
| 1303 | return 0; |
| 1304 | } |
| 1305 | |
| 1306 | static ssize_t state_read(struct file *file, char __user *buf, size_t count, |
| 1307 | loff_t *ppos) |
| 1308 | { |
| 1309 | int n = state.len - state.ptr; |
| 1310 | if (n > count) |
| 1311 | n = count; |
| 1312 | if (n <= 0) |
| 1313 | return 0; |
| 1314 | if (copy_to_user(buf, &state.buf[state.ptr], n)) |
| 1315 | return -EFAULT; |
| 1316 | state.ptr += n; |
| 1317 | return n; |
| 1318 | } |
| 1319 | |
Arjan van de Ven | 9c2e08c | 2007-02-12 00:55:37 -0800 | [diff] [blame] | 1320 | static const struct file_operations state_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | .owner = THIS_MODULE, |
| 1322 | .llseek = no_llseek, |
| 1323 | .read = state_read, |
| 1324 | .open = state_open, |
| 1325 | .release = state_release, |
| 1326 | }; |
| 1327 | |
| 1328 | static int state_init(void) |
| 1329 | { |
| 1330 | #ifndef MODULE |
| 1331 | int state_unit; |
| 1332 | #endif |
| 1333 | state_unit = register_sound_special(&state_fops, SND_DEV_STATUS); |
| 1334 | if (state_unit < 0) |
| 1335 | return state_unit ; |
| 1336 | state.busy = 0; |
| 1337 | return 0 ; |
| 1338 | } |
| 1339 | |
| 1340 | |
| 1341 | /* |
| 1342 | * Config & Setup |
| 1343 | * |
| 1344 | * This function is called by _one_ chipset-specific driver |
| 1345 | */ |
| 1346 | |
| 1347 | int dmasound_init(void) |
| 1348 | { |
| 1349 | int res ; |
| 1350 | #ifdef MODULE |
| 1351 | if (irq_installed) |
| 1352 | return -EBUSY; |
| 1353 | #endif |
| 1354 | |
| 1355 | /* Set up sound queue, /dev/audio and /dev/dsp. */ |
| 1356 | |
| 1357 | /* Set default settings. */ |
| 1358 | if ((res = sq_init()) < 0) |
| 1359 | return res ; |
| 1360 | |
| 1361 | /* Set up /dev/sndstat. */ |
| 1362 | if ((res = state_init()) < 0) |
| 1363 | return res ; |
| 1364 | |
| 1365 | /* Set up /dev/mixer. */ |
| 1366 | mixer_init(); |
| 1367 | |
| 1368 | if (!dmasound.mach.irqinit()) { |
| 1369 | printk(KERN_ERR "DMA sound driver: Interrupt initialization failed\n"); |
| 1370 | return -ENODEV; |
| 1371 | } |
| 1372 | #ifdef MODULE |
| 1373 | irq_installed = 1; |
| 1374 | #endif |
| 1375 | |
| 1376 | printk(KERN_INFO "%s DMA sound driver rev %03d installed\n", |
| 1377 | dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) + |
| 1378 | ((dmasound.mach.version>>8) & 0x0f)); |
| 1379 | printk(KERN_INFO |
| 1380 | "Core driver edition %02d.%02d : %s driver edition %02d.%02d\n", |
| 1381 | DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2, |
| 1382 | (dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ; |
| 1383 | printk(KERN_INFO "Write will use %4d fragments of %7d bytes as default\n", |
| 1384 | numWriteBufs, writeBufSize) ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | return 0; |
| 1386 | } |
| 1387 | |
| 1388 | #ifdef MODULE |
| 1389 | |
| 1390 | void dmasound_deinit(void) |
| 1391 | { |
| 1392 | if (irq_installed) { |
| 1393 | sound_silence(); |
| 1394 | dmasound.mach.irqcleanup(); |
| 1395 | irq_installed = 0; |
| 1396 | } |
| 1397 | |
| 1398 | write_sq_release_buffers(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
| 1400 | if (mixer_unit >= 0) |
| 1401 | unregister_sound_mixer(mixer_unit); |
| 1402 | if (state_unit >= 0) |
| 1403 | unregister_sound_special(state_unit); |
| 1404 | if (sq_unit >= 0) |
| 1405 | unregister_sound_dsp(sq_unit); |
| 1406 | } |
| 1407 | |
| 1408 | #else /* !MODULE */ |
| 1409 | |
| 1410 | static int dmasound_setup(char *str) |
| 1411 | { |
| 1412 | int ints[6], size; |
| 1413 | |
| 1414 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 1415 | |
| 1416 | /* check the bootstrap parameter for "dmasound=" */ |
| 1417 | |
| 1418 | /* FIXME: other than in the most naive of cases there is no sense in these |
| 1419 | * buffers being other than powers of two. This is not checked yet. |
| 1420 | */ |
| 1421 | |
| 1422 | switch (ints[0]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | case 3: |
| 1424 | if ((ints[3] < 0) || (ints[3] > MAX_CATCH_RADIUS)) |
| 1425 | printk("dmasound_setup: invalid catch radius, using default = %d\n", catchRadius); |
| 1426 | else |
| 1427 | catchRadius = ints[3]; |
| 1428 | /* fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | case 2: |
| 1430 | if (ints[1] < MIN_BUFFERS) |
| 1431 | printk("dmasound_setup: invalid number of buffers, using default = %d\n", numWriteBufs); |
| 1432 | else |
| 1433 | numWriteBufs = ints[1]; |
| 1434 | /* fall through */ |
| 1435 | case 1: |
| 1436 | if ((size = ints[2]) < 256) /* check for small buffer specs */ |
| 1437 | size <<= 10 ; |
| 1438 | if (size < MIN_BUFSIZE || size > MAX_BUFSIZE) |
| 1439 | printk("dmasound_setup: invalid write buffer size, using default = %d\n", writeBufSize); |
| 1440 | else |
| 1441 | writeBufSize = size; |
| 1442 | case 0: |
| 1443 | break; |
| 1444 | default: |
| 1445 | printk("dmasound_setup: invalid number of arguments\n"); |
| 1446 | return 0; |
| 1447 | } |
| 1448 | return 1; |
| 1449 | } |
| 1450 | |
| 1451 | __setup("dmasound=", dmasound_setup); |
| 1452 | |
| 1453 | #endif /* !MODULE */ |
| 1454 | |
| 1455 | /* |
| 1456 | * Conversion tables |
| 1457 | */ |
| 1458 | |
| 1459 | #ifdef HAS_8BIT_TABLES |
| 1460 | /* 8 bit mu-law */ |
| 1461 | |
| 1462 | char dmasound_ulaw2dma8[] = { |
| 1463 | -126, -122, -118, -114, -110, -106, -102, -98, |
| 1464 | -94, -90, -86, -82, -78, -74, -70, -66, |
| 1465 | -63, -61, -59, -57, -55, -53, -51, -49, |
| 1466 | -47, -45, -43, -41, -39, -37, -35, -33, |
| 1467 | -31, -30, -29, -28, -27, -26, -25, -24, |
| 1468 | -23, -22, -21, -20, -19, -18, -17, -16, |
| 1469 | -16, -15, -15, -14, -14, -13, -13, -12, |
| 1470 | -12, -11, -11, -10, -10, -9, -9, -8, |
| 1471 | -8, -8, -7, -7, -7, -7, -6, -6, |
| 1472 | -6, -6, -5, -5, -5, -5, -4, -4, |
| 1473 | -4, -4, -4, -4, -3, -3, -3, -3, |
| 1474 | -3, -3, -3, -3, -2, -2, -2, -2, |
| 1475 | -2, -2, -2, -2, -2, -2, -2, -2, |
| 1476 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 1477 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 1478 | -1, -1, -1, -1, -1, -1, -1, 0, |
| 1479 | 125, 121, 117, 113, 109, 105, 101, 97, |
| 1480 | 93, 89, 85, 81, 77, 73, 69, 65, |
| 1481 | 62, 60, 58, 56, 54, 52, 50, 48, |
| 1482 | 46, 44, 42, 40, 38, 36, 34, 32, |
| 1483 | 30, 29, 28, 27, 26, 25, 24, 23, |
| 1484 | 22, 21, 20, 19, 18, 17, 16, 15, |
| 1485 | 15, 14, 14, 13, 13, 12, 12, 11, |
| 1486 | 11, 10, 10, 9, 9, 8, 8, 7, |
| 1487 | 7, 7, 6, 6, 6, 6, 5, 5, |
| 1488 | 5, 5, 4, 4, 4, 4, 3, 3, |
| 1489 | 3, 3, 3, 3, 2, 2, 2, 2, |
| 1490 | 2, 2, 2, 2, 1, 1, 1, 1, |
| 1491 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 1492 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 1493 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 1494 | 0, 0, 0, 0, 0, 0, 0, 0 |
| 1495 | }; |
| 1496 | |
| 1497 | /* 8 bit A-law */ |
| 1498 | |
| 1499 | char dmasound_alaw2dma8[] = { |
| 1500 | -22, -21, -24, -23, -18, -17, -20, -19, |
| 1501 | -30, -29, -32, -31, -26, -25, -28, -27, |
| 1502 | -11, -11, -12, -12, -9, -9, -10, -10, |
| 1503 | -15, -15, -16, -16, -13, -13, -14, -14, |
| 1504 | -86, -82, -94, -90, -70, -66, -78, -74, |
| 1505 | -118, -114, -126, -122, -102, -98, -110, -106, |
| 1506 | -43, -41, -47, -45, -35, -33, -39, -37, |
| 1507 | -59, -57, -63, -61, -51, -49, -55, -53, |
| 1508 | -2, -2, -2, -2, -2, -2, -2, -2, |
| 1509 | -2, -2, -2, -2, -2, -2, -2, -2, |
| 1510 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 1511 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 1512 | -6, -6, -6, -6, -5, -5, -5, -5, |
| 1513 | -8, -8, -8, -8, -7, -7, -7, -7, |
| 1514 | -3, -3, -3, -3, -3, -3, -3, -3, |
| 1515 | -4, -4, -4, -4, -4, -4, -4, -4, |
| 1516 | 21, 20, 23, 22, 17, 16, 19, 18, |
| 1517 | 29, 28, 31, 30, 25, 24, 27, 26, |
| 1518 | 10, 10, 11, 11, 8, 8, 9, 9, |
| 1519 | 14, 14, 15, 15, 12, 12, 13, 13, |
| 1520 | 86, 82, 94, 90, 70, 66, 78, 74, |
| 1521 | 118, 114, 126, 122, 102, 98, 110, 106, |
| 1522 | 43, 41, 47, 45, 35, 33, 39, 37, |
| 1523 | 59, 57, 63, 61, 51, 49, 55, 53, |
| 1524 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 1525 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 1526 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 1527 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 1528 | 5, 5, 5, 5, 4, 4, 4, 4, |
| 1529 | 7, 7, 7, 7, 6, 6, 6, 6, |
| 1530 | 2, 2, 2, 2, 2, 2, 2, 2, |
| 1531 | 3, 3, 3, 3, 3, 3, 3, 3 |
| 1532 | }; |
| 1533 | #endif /* HAS_8BIT_TABLES */ |
| 1534 | |
| 1535 | /* |
| 1536 | * Visible symbols for modules |
| 1537 | */ |
| 1538 | |
| 1539 | EXPORT_SYMBOL(dmasound); |
| 1540 | EXPORT_SYMBOL(dmasound_init); |
| 1541 | #ifdef MODULE |
| 1542 | EXPORT_SYMBOL(dmasound_deinit); |
| 1543 | #endif |
| 1544 | EXPORT_SYMBOL(dmasound_write_sq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | EXPORT_SYMBOL(dmasound_catchRadius); |
| 1546 | #ifdef HAS_8BIT_TABLES |
| 1547 | EXPORT_SYMBOL(dmasound_ulaw2dma8); |
| 1548 | EXPORT_SYMBOL(dmasound_alaw2dma8); |
| 1549 | #endif |