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
27 #include <dev/sound/pcm/sound.h>
28 #include <dev/sound/pcm/vchan.h>
29 #ifdef USING_MUTEX
30 #include <sys/sx.h>
31 #endif
32
33 SND_DECLARE_FILE("$FreeBSD: releng/6.0/sys/dev/sound/pcm/sndstat.c 150401 2005-09-21 02:44:09Z yongari $");
34
35 #define SS_TYPE_MODULE 0
36 #define SS_TYPE_FIRST 1
37 #define SS_TYPE_PCM 1
38 #define SS_TYPE_MIDI 2
39 #define SS_TYPE_SEQUENCER 3
40 #define SS_TYPE_LAST 3
41
42 static d_open_t sndstat_open;
43 static d_close_t sndstat_close;
44 static d_read_t sndstat_read;
45
46 static struct cdevsw sndstat_cdevsw = {
47 .d_version = D_VERSION,
48 .d_flags = D_NEEDGIANT,
49 .d_open = sndstat_open,
50 .d_close = sndstat_close,
51 .d_read = sndstat_read,
52 .d_name = "sndstat",
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 sx sndstat_lock;
65 #endif
66 static struct sbuf sndstat_sbuf;
67 static struct cdev *sndstat_dev = 0;
68 static int sndstat_isopen = 0;
69 static int sndstat_bufptr;
70 static int sndstat_maxunit = -1;
71 static int sndstat_files = 0;
72
73 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
74
75 static int sndstat_verbose = 1;
76 #ifdef USING_MUTEX
77 TUNABLE_INT("hw.snd.verbose", &sndstat_verbose);
78 #else
79 TUNABLE_INT_DECL("hw.snd.verbose", 1, sndstat_verbose);
80 #endif
81
82 static int sndstat_prepare(struct sbuf *s);
83
84 static int
85 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
86 {
87 intrmask_t s;
88 int error, verbose;
89
90 verbose = sndstat_verbose;
91 error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req);
92 if (error == 0 && req->newptr != NULL) {
93 s = spltty();
94 sx_xlock(&sndstat_lock);
95 if (verbose < 0 || verbose > 3)
96 error = EINVAL;
97 else
98 sndstat_verbose = verbose;
99 sx_xunlock(&sndstat_lock);
100 splx(s);
101 }
102 return error;
103 }
104 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
105 0, sizeof(int), sysctl_hw_sndverbose, "I", "");
106
107 static int
108 sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
109 {
110 intrmask_t s;
111 int error;
112
113 s = spltty();
114 sx_xlock(&sndstat_lock);
115 if (sndstat_isopen) {
116 sx_xunlock(&sndstat_lock);
117 splx(s);
118 return EBUSY;
119 }
120 sndstat_isopen = 1;
121 sx_xunlock(&sndstat_lock);
122 splx(s);
123 if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) {
124 error = ENXIO;
125 goto out;
126 }
127 sndstat_bufptr = 0;
128 error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
129 out:
130 if (error) {
131 s = spltty();
132 sx_xlock(&sndstat_lock);
133 sndstat_isopen = 0;
134 sx_xunlock(&sndstat_lock);
135 splx(s);
136 }
137 return (error);
138 }
139
140 static int
141 sndstat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
142 {
143 intrmask_t s;
144
145 s = spltty();
146 sx_xlock(&sndstat_lock);
147 if (!sndstat_isopen) {
148 sx_xunlock(&sndstat_lock);
149 splx(s);
150 return EBADF;
151 }
152 sbuf_delete(&sndstat_sbuf);
153 sndstat_isopen = 0;
154
155 sx_xunlock(&sndstat_lock);
156 splx(s);
157 return 0;
158 }
159
160 static int
161 sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
162 {
163 intrmask_t s;
164 int l, err;
165
166 s = spltty();
167 sx_xlock(&sndstat_lock);
168 if (!sndstat_isopen) {
169 sx_xunlock(&sndstat_lock);
170 splx(s);
171 return EBADF;
172 }
173 l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
174 err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
175 sndstat_bufptr += l;
176
177 sx_xunlock(&sndstat_lock);
178 splx(s);
179 return err;
180 }
181
182 /************************************************************************/
183
184 static struct sndstat_entry *
185 sndstat_find(int type, int unit)
186 {
187 struct sndstat_entry *ent;
188
189 SLIST_FOREACH(ent, &sndstat_devlist, link) {
190 if (ent->type == type && ent->unit == unit)
191 return ent;
192 }
193
194 return NULL;
195 }
196
197 int
198 sndstat_register(device_t dev, char *str, sndstat_handler handler)
199 {
200 intrmask_t s;
201 struct sndstat_entry *ent;
202 const char *devtype;
203 int type, unit;
204
205 if (dev) {
206 unit = device_get_unit(dev);
207 devtype = device_get_name(dev);
208 if (!strcmp(devtype, "pcm"))
209 type = SS_TYPE_PCM;
210 else if (!strcmp(devtype, "midi"))
211 type = SS_TYPE_MIDI;
212 else if (!strcmp(devtype, "sequencer"))
213 type = SS_TYPE_SEQUENCER;
214 else
215 return EINVAL;
216 } else {
217 type = SS_TYPE_MODULE;
218 unit = -1;
219 }
220
221 ent = malloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK);
222 if (!ent)
223 return ENOSPC;
224
225 ent->dev = dev;
226 ent->str = str;
227 ent->type = type;
228 ent->unit = unit;
229 ent->handler = handler;
230
231 s = spltty();
232 sx_xlock(&sndstat_lock);
233 SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
234 if (type == SS_TYPE_MODULE)
235 sndstat_files++;
236 sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
237 sx_xunlock(&sndstat_lock);
238 splx(s);
239
240 return 0;
241 }
242
243 int
244 sndstat_registerfile(char *str)
245 {
246 return sndstat_register(NULL, str, NULL);
247 }
248
249 int
250 sndstat_unregister(device_t dev)
251 {
252 intrmask_t s;
253 struct sndstat_entry *ent;
254
255 s = spltty();
256 sx_xlock(&sndstat_lock);
257 SLIST_FOREACH(ent, &sndstat_devlist, link) {
258 if (ent->dev == dev) {
259 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
260 sx_xunlock(&sndstat_lock);
261 splx(s);
262 free(ent, M_DEVBUF);
263
264 return 0;
265 }
266 }
267 sx_xunlock(&sndstat_lock);
268 splx(s);
269
270 return ENXIO;
271 }
272
273 int
274 sndstat_unregisterfile(char *str)
275 {
276 intrmask_t s;
277 struct sndstat_entry *ent;
278
279 s = spltty();
280 sx_xlock(&sndstat_lock);
281 SLIST_FOREACH(ent, &sndstat_devlist, link) {
282 if (ent->dev == NULL && ent->str == str) {
283 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
284 sndstat_files--;
285 sx_xunlock(&sndstat_lock);
286 splx(s);
287 free(ent, M_DEVBUF);
288
289 return 0;
290 }
291 }
292 sx_xunlock(&sndstat_lock);
293 splx(s);
294
295 return ENXIO;
296 }
297
298 /************************************************************************/
299
300 static int
301 sndstat_prepare(struct sbuf *s)
302 {
303 struct sndstat_entry *ent;
304 int i, j;
305
306 sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n");
307 if (SLIST_EMPTY(&sndstat_devlist)) {
308 sbuf_printf(s, "No devices installed.\n");
309 sbuf_finish(s);
310 return sbuf_len(s);
311 }
312
313 sbuf_printf(s, "Installed devices:\n");
314
315 for (i = 0; i <= sndstat_maxunit; i++) {
316 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
317 ent = sndstat_find(j, i);
318 if (!ent)
319 continue;
320 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
321 sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
322 sbuf_printf(s, " %s", ent->str);
323 if (ent->handler)
324 ent->handler(s, ent->dev, sndstat_verbose);
325 else
326 sbuf_printf(s, " [no handler]");
327 sbuf_printf(s, "\n");
328 }
329 }
330
331 if (sndstat_verbose >= 3 && sndstat_files > 0) {
332 sbuf_printf(s, "\nFile Versions:\n");
333
334 SLIST_FOREACH(ent, &sndstat_devlist, link) {
335 if (ent->dev == NULL && ent->str != NULL)
336 sbuf_printf(s, "%s\n", ent->str);
337 }
338 }
339
340 sbuf_finish(s);
341 return sbuf_len(s);
342 }
343
344 static int
345 sndstat_init(void)
346 {
347 sx_init(&sndstat_lock, "sndstat");
348 sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS, UID_ROOT, GID_WHEEL, 0444, "sndstat");
349
350 return (sndstat_dev != 0)? 0 : ENXIO;
351 }
352
353 static int
354 sndstat_uninit(void)
355 {
356 intrmask_t s;
357
358 s = spltty();
359 sx_xlock(&sndstat_lock);
360 if (sndstat_isopen) {
361 sx_xunlock(&sndstat_lock);
362 splx(s);
363 return EBUSY;
364 }
365
366 if (sndstat_dev)
367 destroy_dev(sndstat_dev);
368 sndstat_dev = 0;
369
370 splx(s);
371 sx_xunlock(&sndstat_lock);
372 sx_destroy(&sndstat_lock);
373 return 0;
374 }
375
376 int
377 sndstat_busy(void)
378 {
379 return (sndstat_isopen);
380 }
381
382 static void
383 sndstat_sysinit(void *p)
384 {
385 sndstat_init();
386 }
387
388 static void
389 sndstat_sysuninit(void *p)
390 {
391 int error;
392
393 error = sndstat_uninit();
394 KASSERT(error == 0, ("%s: error = %d", __func__, error));
395 }
396
397 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
398 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);
399
400
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