1 /* 2 * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk> 3 * (C) 1997 Luigi Rizzo (luigi@iet.unipi.it) 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include "opt_devfs.h" 31 32 #include <dev/pcm/sound.h> 33 #ifdef DEVFS 34 #include <sys/devfsext.h> 35 #endif /* DEVFS */ 36 37 #if NPCM > 0 /* from "pcm.h" via disgusting #include in snd/sound.h */ 38 39 extern struct isa_driver pcmdriver; 40 41 static int status_isopen = 0; 42 static int status_init(char *buf, int size); 43 static int status_read(struct uio *buf); 44 45 static d_open_t sndopen; 46 static d_close_t sndclose; 47 static d_ioctl_t sndioctl; 48 static d_read_t sndread; 49 static d_write_t sndwrite; 50 static d_mmap_t sndmmap; 51 static d_poll_t sndpoll; 52 53 #define CDEV_MAJOR 30 54 static struct cdevsw snd_cdevsw = { 55 /* open */ sndopen, 56 /* close */ sndclose, 57 /* read */ sndread, 58 /* write */ sndwrite, 59 /* ioctl */ sndioctl, 60 /* poll */ sndpoll, 61 /* mmap */ sndmmap, 62 /* strategy */ nostrategy, 63 /* name */ "snd", 64 /* maj */ CDEV_MAJOR, 65 /* dump */ nodump, 66 /* psize */ nopsize, 67 /* flags */ 0, 68 /* bmaj */ -1 69 }; 70 71 /* PROPOSAL: 72 each unit needs: 73 status, mixer, dsp, dspW, audio, sequencer, midi-in, seq2, sndproc = 9 devices 74 dspW and audio are deprecated. 75 dsp needs min 64 channels, will give it 256 76 77 minor = (unit << 12) + (dev << 8) + channel 78 currently minor = (channel << 8) + (unit << 4) + dev 79 80 nomenclature: 81 /dev/pcmX/dsp.(0..255) 82 /dev/pcmX/dspW 83 /dev/pcmX/audio 84 /dev/pcmX/status 85 /dev/pcmX/mixer 86 [etc.] 87 88 currently: 89 minor = (channel << 8) + (unit << 4) + dev 90 */ 91 92 #define PCMMINOR(x) (minor(x)) 93 #define PCMCHAN(x) ((PCMMINOR(x) & 0x0000ff00) >> 8) 94 #define PCMUNIT(x) ((PCMMINOR(x) & 0x000000f0) >> 4) 95 #define PCMDEV(x) (PCMMINOR(x) & 0x0000000f) 96 97 static devclass_t pcm_devclass; 98 99 static snddev_info * 100 gsd(int unit) 101 { 102 return devclass_get_softc(pcm_devclass, unit); 103 } 104 105 int 106 pcm_addchan(device_t dev, int dir, pcm_channel *templ, void *devinfo) 107 { 108 snddev_info *d = device_get_softc(dev); 109 pcm_channel *ch; 110 111 ch = (dir == PCMDIR_PLAY)? &d->play[d->playcount++] : &d->rec[d->reccount++]; 112 *ch = *templ; 113 chn_init(ch, devinfo, dir); 114 d->chancount++; 115 return 0; 116 } 117 118 int 119 pcm_setstatus(device_t dev, char *str) 120 { 121 snddev_info *d = device_get_softc(dev); 122 strncpy(d->status, str, SND_STATUSLEN); 123 return 0; 124 } 125 126 u_int32_t 127 pcm_getflags(device_t dev) 128 { 129 snddev_info *d = device_get_softc(dev); 130 return d->flags; 131 } 132 133 void 134 pcm_setflags(device_t dev, u_int32_t val) 135 { 136 snddev_info *d = device_get_softc(dev); 137 d->flags = val; 138 } 139 140 /* This is the generic init routine */ 141 int 142 pcm_register(device_t dev, void *devinfo, int numplay, int numrec) 143 { 144 int sz, unit = device_get_unit(dev); 145 snddev_info *d = device_get_softc(dev); 146 147 if (!pcm_devclass) { 148 pcm_devclass = device_get_devclass(dev); 149 cdevsw_add(&snd_cdevsw); 150 } 151 d->devinfo = devinfo; 152 d->chancount = d->playcount = d->reccount = 0; 153 sz = (numplay + numrec) * sizeof(pcm_channel *); 154 d->aplay = (pcm_channel **)malloc(sz, M_DEVBUF, M_NOWAIT); 155 if (!d->aplay) goto no; 156 d->arec = (pcm_channel **)malloc(sz, M_DEVBUF, M_NOWAIT); 157 if (!d->arec) goto no; 158 bzero(d->aplay, sz); 159 bzero(d->arec, sz); 160 161 d->play = (pcm_channel *)malloc(numplay * sizeof(pcm_channel), 162 M_DEVBUF, M_NOWAIT); 163 if (!d->play) goto no; 164 d->rec = (pcm_channel *)malloc(numrec * sizeof(pcm_channel), 165 M_DEVBUF, M_NOWAIT); 166 if (!d->rec) goto no; 167 bzero(d->play, numplay * sizeof(pcm_channel)); 168 bzero(d->rec, numrec * sizeof(pcm_channel)); 169 170 fkchan_setup(&d->fakechan); 171 chn_init(&d->fakechan, NULL, 0); 172 d->magic = MAGIC(unit); /* debugging... */ 173 174 return 0; 175 no: 176 if (d->aplay) free(d->aplay, M_DEVBUF); 177 if (d->play) free(d->play, M_DEVBUF); 178 if (d->arec) free(d->arec, M_DEVBUF); 179 if (d->rec) free(d->rec, M_DEVBUF); 180 return ENXIO; 181 } 182 183 /* 184 * a small utility function which, given a device number, returns 185 * a pointer to the associated snddev_info struct, and sets the unit 186 * number. 187 */ 188 static snddev_info * 189 get_snddev_info(dev_t i_dev, int *unit, int *dev, int *chan) 190 { 191 int u, d, c; 192 193 u = PCMUNIT(i_dev); 194 d = PCMDEV(i_dev); 195 c = PCMCHAN(i_dev); 196 if (u > devclass_get_maxunit(pcm_devclass)) u = -1; 197 if (unit) *unit = u; 198 if (dev) *dev = d; 199 if (chan) *chan = c; 200 if (u < 0) return NULL; 201 202 switch(d) { 203 case SND_DEV_CTL: /* /dev/mixer handled by pcm */ 204 case SND_DEV_STATUS: /* /dev/sndstat handled by pcm */ 205 case SND_DEV_DSP: 206 case SND_DEV_DSP16: 207 case SND_DEV_AUDIO: 208 return gsd(u); 209 210 case SND_DEV_SEQ: /* XXX when enabled... */ 211 case SND_DEV_SEQ2: 212 case SND_DEV_MIDIN: 213 case SND_DEV_SNDPROC: /* /dev/sndproc handled by pcm */ 214 default: 215 printf("unsupported subdevice %d\n", d); 216 return NULL; 217 } 218 } 219 220 static int 221 sndopen(dev_t i_dev, int flags, int mode, struct proc *p) 222 { 223 int dev, unit, chan; 224 snddev_info *d = get_snddev_info(i_dev, &unit, &dev, &chan); 225 226 DEB(printf("open snd%d subdev %d flags 0x%08x mode 0x%08x\n", 227 unit, dev, flags, mode)); 228 229 switch(dev) { 230 case SND_DEV_STATUS: 231 if (status_isopen) return EBUSY; 232 status_isopen = 1; 233 return 0; 234 235 case SND_DEV_CTL: 236 return d? 0 : ENXIO; 237 238 case SND_DEV_AUDIO: 239 case SND_DEV_DSP: 240 case SND_DEV_DSP16: 241 case SND_DEV_NORESET: 242 return d? dsp_open(d, chan, flags, dev) : ENXIO; 243 244 default: 245 return ENXIO; 246 } 247 } 248 249 static int 250 sndclose(dev_t i_dev, int flags, int mode, struct proc *p) 251 { 252 int dev, unit, chan; 253 snddev_info *d = get_snddev_info(i_dev, &unit, &dev, &chan); 254 255 DEB(printf("close snd%d subdev %d\n", unit, dev)); 256 257 switch(dev) { /* only those for which close makes sense */ 258 case SND_DEV_STATUS: 259 if (!status_isopen) return EBADF; 260 status_isopen = 0; 261 return 0; 262 263 case SND_DEV_CTL: 264 return d? 0 : ENXIO; 265 266 case SND_DEV_AUDIO: 267 case SND_DEV_DSP: 268 case SND_DEV_DSP16: 269 return d? dsp_close(d, chan, dev) : ENXIO; 270 271 default: 272 return ENXIO; 273 } 274 } 275 276 static int 277 sndread(dev_t i_dev, struct uio *buf, int flag) 278 { 279 int dev, unit, chan; 280 snddev_info *d = get_snddev_info(i_dev, &unit, &dev, &chan); 281 DEB(printf("read snd%d subdev %d flag 0x%08x\n", unit, dev, flag)); 282 283 switch(dev) { 284 case SND_DEV_STATUS: 285 return status_isopen? status_read(buf) : EBADF; 286 287 case SND_DEV_AUDIO: 288 case SND_DEV_DSP: 289 case SND_DEV_DSP16: 290 return d? dsp_read(d, chan, buf, flag) : EBADF; 291 292 default: 293 return ENXIO; 294 } 295 } 296 297 static int 298 sndwrite(dev_t i_dev, struct uio *buf, int flag) 299 { 300 int dev, unit, chan; 301 snddev_info *d = get_snddev_info(i_dev, &unit, &dev, &chan); 302 303 DEB(printf("write snd%d subdev %d flag 0x%08x\n", unit, dev & 0xf, flag)); 304 305 switch(dev) { /* only writeable devices */ 306 case SND_DEV_DSP: 307 case SND_DEV_DSP16: 308 case SND_DEV_AUDIO: 309 return d? dsp_write(d, chan, buf, flag) : EBADF; 310 311 default: 312 return EPERM; /* for non-writeable devices ; */ 313 } 314 } 315 316 static int 317 sndioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct proc * p) 318 { 319 int dev, chan; 320 snddev_info *d = get_snddev_info(i_dev, NULL, &dev, &chan); 321 322 if (d == NULL) return ENXIO; 323 324 switch(dev) { 325 case SND_DEV_CTL: 326 return mixer_ioctl(d, cmd, arg); 327 328 case SND_DEV_AUDIO: 329 case SND_DEV_DSP: 330 case SND_DEV_DSP16: 331 return dsp_ioctl(d, chan, cmd, arg); 332 333 default: 334 return ENXIO; 335 } 336 } 337 338 static int 339 sndpoll(dev_t i_dev, int events, struct proc *p) 340 { 341 int dev, chan; 342 snddev_info *d = get_snddev_info(i_dev, NULL, &dev, &chan); 343 344 DEB(printf("sndpoll dev 0x%04x events 0x%08x\n", i_dev, events)); 345 346 if (d == NULL) return ENXIO; 347 348 switch(dev) { 349 case SND_DEV_AUDIO: 350 case SND_DEV_DSP: 351 case SND_DEV_DSP16: 352 return dsp_poll(d, chan, events, p); 353 354 default: 355 return (events & 356 (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) | POLLHUP; 357 } 358 } 359 360 /* 361 * The mmap interface allows access to the play and read buffer, 362 * plus the device descriptor. 363 * The various blocks are accessible at the following offsets: 364 * 365 * 0x00000000 ( 0 ) : write buffer ; 366 * 0x01000000 (16 MB) : read buffer ; 367 * 0x02000000 (32 MB) : device descriptor (dangerous!) 368 * 369 * WARNING: the mmap routines assume memory areas are aligned. This 370 * is true (probably) for the dma buffers, but likely false for the 371 * device descriptor. As a consequence, we do not know where it is 372 * located in the requested area. 373 */ 374 static int 375 sndmmap(dev_t i_dev, vm_offset_t offset, int nprot) 376 { 377 int unit, dev, chan; 378 snddev_info *d = get_snddev_info(i_dev, &unit, &dev, &chan); 379 380 DEB(printf("sndmmap d 0x%p dev 0x%04x ofs 0x%08x nprot 0x%08x\n", 381 d, dev, offset, nprot)); 382 383 if (d == NULL || nprot & PROT_EXEC) return -1; /* forbidden */ 384 385 switch(dev) { 386 case SND_DEV_AUDIO: 387 case SND_DEV_DSP: 388 case SND_DEV_DSP16: 389 return dsp_mmap(d, chan, offset, nprot); 390 391 default: 392 return -1; 393 } 394 } 395 396 static int 397 status_init(char *buf, int size) 398 { 399 int i; 400 device_t dev; 401 snddev_info *d; 402 403 snprintf(buf, size, "FreeBSD Audio Driver (newpcm) %s %s\n" 404 "Installed devices:\n", __DATE__, __TIME__); 405 406 for (i = 0; i <= devclass_get_maxunit(pcm_devclass); i++) { 407 d = gsd(i); 408 if (!d) continue; 409 dev = devclass_get_device(pcm_devclass, i); 410 if (1) snprintf(buf + strlen(buf), size - strlen(buf), 411 "pcm%d: <%s> %s (%d/%d channels%s)\n", 412 i, device_get_desc(dev), d->status, 413 d->playcount, d->reccount, 414 (!(d->flags & SD_F_SIMPLEX))? " duplex" : ""); 415 } 416 return strlen(buf); 417 } 418 419 static int 420 status_read(struct uio *buf) 421 { 422 static char status_buf[4096]; 423 static int bufptr = 0, buflen = 0; 424 int l; 425 426 if (status_isopen == 1) { 427 status_isopen++; 428 bufptr = 0; 429 buflen = status_init(status_buf, sizeof status_buf); 430 } 431 432 l = min(buf->uio_resid, buflen - bufptr); 433 bufptr += l; 434 return (l > 0)? uiomove(status_buf + bufptr - l, l, buf) : 0; 435 } 436 437 #endif /* NPCM > 0 */ 438