1 /*- 2 * Copyright (c) 2001 Cameron Grant <cg@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/dev/sound/pcm/sndstat.c,v 1.20.2.2 2005/12/30 19:55:54 netchild Exp $ 27 */ 28 29 #include <dev/sound/pcm/sound.h> 30 #include <dev/sound/pcm/vchan.h> 31 #ifdef USING_MUTEX 32 #include <sys/lock.h> 33 #endif 34 35 36 #define SS_TYPE_MODULE 0 37 #define SS_TYPE_FIRST 1 38 #define SS_TYPE_PCM 1 39 #define SS_TYPE_MIDI 2 40 #define SS_TYPE_SEQUENCER 3 41 #define SS_TYPE_LAST 3 42 43 static d_open_t sndstat_open; 44 static d_close_t sndstat_close; 45 static d_read_t sndstat_read; 46 47 static struct dev_ops sndstat_cdevsw = { 48 { "sndstat", 0, 0 }, 49 /* .d_flags = D_NEEDGIANT, */ 50 .d_open = sndstat_open, 51 .d_close = sndstat_close, 52 .d_read = sndstat_read, 53 }; 54 55 struct sndstat_entry { 56 SLIST_ENTRY(sndstat_entry) link; 57 device_t dev; 58 char *str; 59 sndstat_handler handler; 60 int type, unit; 61 }; 62 63 #ifdef USING_MUTEX 64 static struct lock sndstat_lock; 65 #endif 66 static struct sbuf sndstat_sbuf; 67 static int sndstat_isopen = 0; 68 static int sndstat_bufptr; 69 static int sndstat_maxunit = -1; 70 static int sndstat_files = 0; 71 72 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none); 73 74 static int sndstat_verbose = 1; 75 #ifdef USING_MUTEX 76 TUNABLE_INT("hw.snd.verbose", &sndstat_verbose); 77 #else 78 TUNABLE_INT_DECL("hw.snd.verbose", 1, sndstat_verbose); 79 #endif 80 81 static int sndstat_prepare(struct sbuf *s); 82 83 static int 84 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS) 85 { 86 int error, verbose; 87 88 verbose = sndstat_verbose; 89 error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req); 90 if (error == 0 && req->newptr != NULL) { 91 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 92 if (verbose < 0 || verbose > 3) 93 error = EINVAL; 94 else 95 sndstat_verbose = verbose; 96 lockmgr(&sndstat_lock, LK_RELEASE); 97 } 98 return error; 99 } 100 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW, 101 0, sizeof(int), sysctl_hw_sndverbose, "I", ""); 102 103 static int 104 sndstat_open(struct dev_open_args *ap) 105 { 106 int error; 107 108 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 109 if (sndstat_isopen) { 110 lockmgr(&sndstat_lock, LK_RELEASE); 111 return EBUSY; 112 } 113 sndstat_isopen = 1; 114 lockmgr(&sndstat_lock, LK_RELEASE); 115 if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) { 116 error = ENXIO; 117 goto out; 118 } 119 sndstat_bufptr = 0; 120 error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM; 121 out: 122 if (error) { 123 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 124 sndstat_isopen = 0; 125 lockmgr(&sndstat_lock, LK_RELEASE); 126 } 127 return (error); 128 } 129 130 static int 131 sndstat_close(struct dev_close_args *ap) 132 { 133 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 134 if (!sndstat_isopen) { 135 lockmgr(&sndstat_lock, LK_RELEASE); 136 return EBADF; 137 } 138 sbuf_delete(&sndstat_sbuf); 139 sndstat_isopen = 0; 140 141 lockmgr(&sndstat_lock, LK_RELEASE); 142 return 0; 143 } 144 145 static int 146 sndstat_read(struct dev_read_args *ap) 147 { 148 struct uio *buf = ap->a_uio; 149 int l, err; 150 151 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 152 if (!sndstat_isopen) { 153 lockmgr(&sndstat_lock, LK_RELEASE); 154 return EBADF; 155 } 156 l = (int)szmin(buf->uio_resid, 157 sbuf_len(&sndstat_sbuf) - sndstat_bufptr); 158 if (l > 0) { 159 err = uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, 160 l, buf); 161 } else { 162 err = 0; 163 } 164 sndstat_bufptr += l; 165 166 lockmgr(&sndstat_lock, LK_RELEASE); 167 return err; 168 } 169 170 /************************************************************************/ 171 172 static struct sndstat_entry * 173 sndstat_find(int type, int unit) 174 { 175 struct sndstat_entry *ent; 176 177 SLIST_FOREACH(ent, &sndstat_devlist, link) { 178 if (ent->type == type && ent->unit == unit) 179 return ent; 180 } 181 182 return NULL; 183 } 184 185 int 186 sndstat_acquire(void) 187 { 188 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 189 if (sndstat_isopen) { 190 lockmgr(&sndstat_lock, LK_RELEASE); 191 return EBUSY; 192 } 193 sndstat_isopen = 1; 194 lockmgr(&sndstat_lock, LK_RELEASE); 195 return 0; 196 } 197 198 int 199 sndstat_release(void) 200 { 201 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 202 if (!sndstat_isopen) { 203 lockmgr(&sndstat_lock, LK_RELEASE); 204 return EBADF; 205 } 206 sndstat_isopen = 0; 207 lockmgr(&sndstat_lock, LK_RELEASE); 208 return 0; 209 } 210 211 int 212 sndstat_register(device_t dev, char *str, sndstat_handler handler) 213 { 214 struct sndstat_entry *ent; 215 const char *devtype; 216 int type, unit; 217 218 if (dev) { 219 unit = device_get_unit(dev); 220 devtype = device_get_name(dev); 221 if (!strcmp(devtype, "pcm")) 222 type = SS_TYPE_PCM; 223 else if (!strcmp(devtype, "midi")) 224 type = SS_TYPE_MIDI; 225 else if (!strcmp(devtype, "sequencer")) 226 type = SS_TYPE_SEQUENCER; 227 else 228 return EINVAL; 229 } else { 230 type = SS_TYPE_MODULE; 231 unit = -1; 232 } 233 234 ent = kmalloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK); 235 236 ent->dev = dev; 237 ent->str = str; 238 ent->type = type; 239 ent->unit = unit; 240 ent->handler = handler; 241 242 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 243 SLIST_INSERT_HEAD(&sndstat_devlist, ent, link); 244 if (type == SS_TYPE_MODULE) 245 sndstat_files++; 246 sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit; 247 lockmgr(&sndstat_lock, LK_RELEASE); 248 249 return 0; 250 } 251 252 int 253 sndstat_registerfile(char *str) 254 { 255 return sndstat_register(NULL, str, NULL); 256 } 257 258 int 259 sndstat_unregister(device_t dev) 260 { 261 struct sndstat_entry *ent; 262 263 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 264 SLIST_FOREACH(ent, &sndstat_devlist, link) { 265 if (ent->dev == dev) { 266 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link); 267 lockmgr(&sndstat_lock, LK_RELEASE); 268 kfree(ent, M_DEVBUF); 269 270 return 0; 271 } 272 } 273 lockmgr(&sndstat_lock, LK_RELEASE); 274 275 return ENXIO; 276 } 277 278 int 279 sndstat_unregisterfile(char *str) 280 { 281 struct sndstat_entry *ent; 282 283 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 284 SLIST_FOREACH(ent, &sndstat_devlist, link) { 285 if (ent->dev == NULL && ent->str == str) { 286 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link); 287 sndstat_files--; 288 lockmgr(&sndstat_lock, LK_RELEASE); 289 kfree(ent, M_DEVBUF); 290 291 return 0; 292 } 293 } 294 lockmgr(&sndstat_lock, LK_RELEASE); 295 296 return ENXIO; 297 } 298 299 /************************************************************************/ 300 301 static int 302 sndstat_prepare(struct sbuf *s) 303 { 304 struct sndstat_entry *ent; 305 int i, j; 306 307 sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n"); 308 if (SLIST_EMPTY(&sndstat_devlist)) { 309 sbuf_printf(s, "No devices installed.\n"); 310 sbuf_finish(s); 311 return sbuf_len(s); 312 } 313 314 sbuf_printf(s, "Installed devices:\n"); 315 316 for (i = 0; i <= sndstat_maxunit; i++) { 317 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) { 318 ent = sndstat_find(j, i); 319 if (!ent) 320 continue; 321 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev)); 322 sbuf_printf(s, " <%s>", device_get_desc(ent->dev)); 323 sbuf_printf(s, " %s", ent->str); 324 if (ent->handler) 325 ent->handler(s, ent->dev, sndstat_verbose); 326 else 327 sbuf_printf(s, " [no handler]"); 328 sbuf_printf(s, "\n"); 329 } 330 } 331 332 if (sndstat_verbose >= 3 && sndstat_files > 0) { 333 sbuf_printf(s, "\nFile Versions:\n"); 334 335 SLIST_FOREACH(ent, &sndstat_devlist, link) { 336 if (ent->dev == NULL && ent->str != NULL) 337 sbuf_printf(s, "%s\n", ent->str); 338 } 339 } 340 341 sbuf_finish(s); 342 return sbuf_len(s); 343 } 344 345 static int 346 sndstat_init(void) 347 { 348 lockinit(&sndstat_lock, "sndstat", 0, 0); 349 if (make_dev(&sndstat_cdevsw, SND_DEV_STATUS, 350 UID_ROOT, GID_WHEEL, 0444, "sndstat") == NULL) { 351 return ENXIO; 352 } 353 return 0; 354 } 355 356 static int 357 sndstat_uninit(void) 358 { 359 lockmgr(&sndstat_lock, LK_EXCLUSIVE); 360 if (sndstat_isopen) { 361 lockmgr(&sndstat_lock, LK_RELEASE); 362 return EBUSY; 363 } 364 365 //dev_ops_remove(&sndstat_cdevsw, -1, SND_DEV_STATUS); 366 dev_ops_remove_all(&sndstat_cdevsw); 367 lockmgr(&sndstat_lock, LK_RELEASE); 368 return 0; 369 } 370 371 static void 372 sndstat_sysinit(void *p) 373 { 374 sndstat_init(); 375 } 376 377 static void 378 sndstat_sysuninit(void *p) 379 { 380 int error; 381 382 error = sndstat_uninit(); 383 KASSERT(error == 0, ("%s: error = %d", __func__, error)); 384 } 385 386 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL); 387 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL); 388 389 390