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/6.1/sys/dev/sound/pcm/sndstat.c 153901 2005-12-30 19:55:55Z netchild $");
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 int error, verbose;
88
89 verbose = sndstat_verbose;
90 error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req);
91 if (error == 0 && req->newptr != NULL) {
92 sx_xlock(&sndstat_lock);
93 if (verbose < 0 || verbose > 3)
94 error = EINVAL;
95 else
96 sndstat_verbose = verbose;
97 sx_xunlock(&sndstat_lock);
98 }
99 return error;
100 }
101 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
102 0, sizeof(int), sysctl_hw_sndverbose, "I", "");
103
104 static int
105 sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
106 {
107 int error;
108
109 sx_xlock(&sndstat_lock);
110 if (sndstat_isopen) {
111 sx_xunlock(&sndstat_lock);
112 return EBUSY;
113 }
114 sndstat_isopen = 1;
115 sx_xunlock(&sndstat_lock);
116 if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) {
117 error = ENXIO;
118 goto out;
119 }
120 sndstat_bufptr = 0;
121 error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
122 out:
123 if (error) {
124 sx_xlock(&sndstat_lock);
125 sndstat_isopen = 0;
126 sx_xunlock(&sndstat_lock);
127 }
128 return (error);
129 }
130
131 static int
132 sndstat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
133 {
134 sx_xlock(&sndstat_lock);
135 if (!sndstat_isopen) {
136 sx_xunlock(&sndstat_lock);
137 return EBADF;
138 }
139 sbuf_delete(&sndstat_sbuf);
140 sndstat_isopen = 0;
141
142 sx_xunlock(&sndstat_lock);
143 return 0;
144 }
145
146 static int
147 sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
148 {
149 int l, err;
150
151 sx_xlock(&sndstat_lock);
152 if (!sndstat_isopen) {
153 sx_xunlock(&sndstat_lock);
154 return EBADF;
155 }
156 l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
157 err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
158 sndstat_bufptr += l;
159
160 sx_xunlock(&sndstat_lock);
161 return err;
162 }
163
164 /************************************************************************/
165
166 static struct sndstat_entry *
167 sndstat_find(int type, int unit)
168 {
169 struct sndstat_entry *ent;
170
171 SLIST_FOREACH(ent, &sndstat_devlist, link) {
172 if (ent->type == type && ent->unit == unit)
173 return ent;
174 }
175
176 return NULL;
177 }
178
179 int
180 sndstat_acquire(void)
181 {
182 sx_xlock(&sndstat_lock);
183 if (sndstat_isopen) {
184 sx_xunlock(&sndstat_lock);
185 return EBUSY;
186 }
187 sndstat_isopen = 1;
188 sx_xunlock(&sndstat_lock);
189 return 0;
190 }
191
192 int
193 sndstat_release(void)
194 {
195 sx_xlock(&sndstat_lock);
196 if (!sndstat_isopen) {
197 sx_xunlock(&sndstat_lock);
198 return EBADF;
199 }
200 sndstat_isopen = 0;
201 sx_xunlock(&sndstat_lock);
202 return 0;
203 }
204
205 int
206 sndstat_register(device_t dev, char *str, sndstat_handler handler)
207 {
208 struct sndstat_entry *ent;
209 const char *devtype;
210 int type, unit;
211
212 if (dev) {
213 unit = device_get_unit(dev);
214 devtype = device_get_name(dev);
215 if (!strcmp(devtype, "pcm"))
216 type = SS_TYPE_PCM;
217 else if (!strcmp(devtype, "midi"))
218 type = SS_TYPE_MIDI;
219 else if (!strcmp(devtype, "sequencer"))
220 type = SS_TYPE_SEQUENCER;
221 else
222 return EINVAL;
223 } else {
224 type = SS_TYPE_MODULE;
225 unit = -1;
226 }
227
228 ent = malloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK);
229 if (!ent)
230 return ENOSPC;
231
232 ent->dev = dev;
233 ent->str = str;
234 ent->type = type;
235 ent->unit = unit;
236 ent->handler = handler;
237
238 sx_xlock(&sndstat_lock);
239 SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
240 if (type == SS_TYPE_MODULE)
241 sndstat_files++;
242 sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
243 sx_xunlock(&sndstat_lock);
244
245 return 0;
246 }
247
248 int
249 sndstat_registerfile(char *str)
250 {
251 return sndstat_register(NULL, str, NULL);
252 }
253
254 int
255 sndstat_unregister(device_t dev)
256 {
257 struct sndstat_entry *ent;
258
259 sx_xlock(&sndstat_lock);
260 SLIST_FOREACH(ent, &sndstat_devlist, link) {
261 if (ent->dev == dev) {
262 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
263 sx_xunlock(&sndstat_lock);
264 free(ent, M_DEVBUF);
265
266 return 0;
267 }
268 }
269 sx_xunlock(&sndstat_lock);
270
271 return ENXIO;
272 }
273
274 int
275 sndstat_unregisterfile(char *str)
276 {
277 struct sndstat_entry *ent;
278
279 sx_xlock(&sndstat_lock);
280 SLIST_FOREACH(ent, &sndstat_devlist, link) {
281 if (ent->dev == NULL && ent->str == str) {
282 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
283 sndstat_files--;
284 sx_xunlock(&sndstat_lock);
285 free(ent, M_DEVBUF);
286
287 return 0;
288 }
289 }
290 sx_xunlock(&sndstat_lock);
291
292 return ENXIO;
293 }
294
295 /************************************************************************/
296
297 static int
298 sndstat_prepare(struct sbuf *s)
299 {
300 struct sndstat_entry *ent;
301 int i, j;
302
303 sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n");
304 if (SLIST_EMPTY(&sndstat_devlist)) {
305 sbuf_printf(s, "No devices installed.\n");
306 sbuf_finish(s);
307 return sbuf_len(s);
308 }
309
310 sbuf_printf(s, "Installed devices:\n");
311
312 for (i = 0; i <= sndstat_maxunit; i++) {
313 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
314 ent = sndstat_find(j, i);
315 if (!ent)
316 continue;
317 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
318 sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
319 sbuf_printf(s, " %s", ent->str);
320 if (ent->handler)
321 ent->handler(s, ent->dev, sndstat_verbose);
322 else
323 sbuf_printf(s, " [no handler]");
324 sbuf_printf(s, "\n");
325 }
326 }
327
328 if (sndstat_verbose >= 3 && sndstat_files > 0) {
329 sbuf_printf(s, "\nFile Versions:\n");
330
331 SLIST_FOREACH(ent, &sndstat_devlist, link) {
332 if (ent->dev == NULL && ent->str != NULL)
333 sbuf_printf(s, "%s\n", ent->str);
334 }
335 }
336
337 sbuf_finish(s);
338 return sbuf_len(s);
339 }
340
341 static int
342 sndstat_init(void)
343 {
344 sx_init(&sndstat_lock, "sndstat");
345 sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS, UID_ROOT, GID_WHEEL, 0444, "sndstat");
346
347 return (sndstat_dev != 0)? 0 : ENXIO;
348 }
349
350 static int
351 sndstat_uninit(void)
352 {
353 sx_xlock(&sndstat_lock);
354 if (sndstat_isopen) {
355 sx_xunlock(&sndstat_lock);
356 return EBUSY;
357 }
358
359 if (sndstat_dev)
360 destroy_dev(sndstat_dev);
361 sndstat_dev = 0;
362
363 sx_xunlock(&sndstat_lock);
364 sx_destroy(&sndstat_lock);
365 return 0;
366 }
367
368 static void
369 sndstat_sysinit(void *p)
370 {
371 sndstat_init();
372 }
373
374 static void
375 sndstat_sysuninit(void *p)
376 {
377 int error;
378
379 error = sndstat_uninit();
380 KASSERT(error == 0, ("%s: error = %d", __func__, error));
381 }
382
383 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
384 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);
385
386
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