sndstat.c revision 100654 
1/*
2 * Copyright (c) 2001 Cameron Grant <gandalf@vilnya.demon.co.uk>
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
30SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/sndstat.c 100654 2002-07-25 04:49:45Z green $");
31
32#define	SS_TYPE_MODULE		0
33#define	SS_TYPE_FIRST		1
34#define	SS_TYPE_PCM		1
35#define	SS_TYPE_MIDI		2
36#define	SS_TYPE_SEQUENCER	3
37#define	SS_TYPE_LAST		3
38
39static d_open_t sndstat_open;
40static d_close_t sndstat_close;
41static d_read_t sndstat_read;
42
43static struct cdevsw sndstat_cdevsw = {
44	/* open */	sndstat_open,
45	/* close */	sndstat_close,
46	/* read */	sndstat_read,
47	/* write */	nowrite,
48	/* ioctl */	noioctl,
49	/* poll */	nopoll,
50	/* mmap */	nommap,
51	/* strategy */	nostrategy,
52	/* name */	"sndstat",
53	/* maj */	SND_CDEV_MAJOR,
54	/* dump */	nodump,
55	/* psize */	nopsize,
56	/* flags */	0,
57};
58
59struct sndstat_entry {
60	SLIST_ENTRY(sndstat_entry) link;
61	device_t dev;
62	char *str;
63	sndstat_handler handler;
64	int type, unit;
65};
66
67#ifdef	USING_MUTEX
68static struct mtx sndstat_lock;
69#endif
70static struct sbuf sndstat_sbuf;
71static dev_t sndstat_dev = 0;
72static int sndstat_isopen = 0;
73static int sndstat_bufptr;
74static int sndstat_maxunit = -1;
75static int sndstat_files = 0;
76
77static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
78
79static int sndstat_verbose = 1;
80#ifdef	USING_MUTEX
81TUNABLE_INT("hw.snd.verbose", &sndstat_verbose);
82#else
83TUNABLE_INT_DECL("hw.snd.verbose", 1, sndstat_verbose);
84#endif
85
86static int sndstat_prepare(struct sbuf *s);
87
88static int
89sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
90{
91	intrmask_t s;
92	int error, verbose;
93
94	verbose = sndstat_verbose;
95	error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req);
96	if (error == 0 && req->newptr != NULL) {
97		s = spltty();
98		mtx_lock(&sndstat_lock);
99		if (verbose < 0 || verbose > 3)
100			error = EINVAL;
101		else
102			sndstat_verbose = verbose;
103		mtx_unlock(&sndstat_lock);
104		splx(s);
105	}
106	return error;
107}
108SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
109            0, sizeof(int), sysctl_hw_sndverbose, "I", "");
110
111static int
112sndstat_open(dev_t i_dev, int flags, int mode, struct thread *td)
113{
114	intrmask_t s;
115	int error;
116
117	s = spltty();
118	mtx_lock(&sndstat_lock);
119	if (sndstat_isopen) {
120		mtx_unlock(&sndstat_lock);
121		splx(s);
122		return EBUSY;
123	}
124	sndstat_isopen = 1;
125	mtx_unlock(&sndstat_lock);
126	splx(s);
127	if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) {
128		error = ENXIO;
129		goto out;
130	}
131	sndstat_bufptr = 0;
132	error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
133out:
134	if (error) {
135		s = spltty();
136		mtx_lock(&sndstat_lock);
137		sndstat_isopen = 0;
138		mtx_unlock(&sndstat_lock);
139		splx(s);
140	}
141	return (error);
142}
143
144static int
145sndstat_close(dev_t i_dev, int flags, int mode, struct thread *td)
146{
147	intrmask_t s;
148
149	s = spltty();
150	mtx_lock(&sndstat_lock);
151	if (!sndstat_isopen) {
152		mtx_unlock(&sndstat_lock);
153		splx(s);
154		return EBADF;
155	}
156	sbuf_delete(&sndstat_sbuf);
157	sndstat_isopen = 0;
158
159	mtx_unlock(&sndstat_lock);
160	splx(s);
161	return 0;
162}
163
164static int
165sndstat_read(dev_t i_dev, struct uio *buf, int flag)
166{
167	intrmask_t s;
168	int l, err;
169
170	s = spltty();
171	mtx_lock(&sndstat_lock);
172	if (!sndstat_isopen) {
173		mtx_unlock(&sndstat_lock);
174		splx(s);
175		return EBADF;
176	}
177    	l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
178	err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
179	sndstat_bufptr += l;
180
181	mtx_unlock(&sndstat_lock);
182	splx(s);
183	return err;
184}
185
186/************************************************************************/
187
188static struct sndstat_entry *
189sndstat_find(int type, int unit)
190{
191	struct sndstat_entry *ent;
192
193	SLIST_FOREACH(ent, &sndstat_devlist, link) {
194		if (ent->type == type && ent->unit == unit)
195			return ent;
196	}
197
198	return NULL;
199}
200
201int
202sndstat_register(device_t dev, char *str, sndstat_handler handler)
203{
204	intrmask_t s;
205	struct sndstat_entry *ent;
206	const char *devtype;
207	int type, unit;
208
209	if (dev) {
210		unit = device_get_unit(dev);
211		devtype = device_get_name(dev);
212		if (!strcmp(devtype, "pcm"))
213			type = SS_TYPE_PCM;
214		else if (!strcmp(devtype, "midi"))
215			type = SS_TYPE_MIDI;
216		else if (!strcmp(devtype, "sequencer"))
217			type = SS_TYPE_SEQUENCER;
218		else
219			return EINVAL;
220	} else {
221		type = SS_TYPE_MODULE;
222		unit = -1;
223	}
224
225	ent = malloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK);
226	if (!ent)
227		return ENOSPC;
228
229	ent->dev = dev;
230	ent->str = str;
231	ent->type = type;
232	ent->unit = unit;
233	ent->handler = handler;
234
235	s = spltty();
236	mtx_lock(&sndstat_lock);
237	SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
238	if (type == SS_TYPE_MODULE)
239		sndstat_files++;
240	sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
241	mtx_unlock(&sndstat_lock);
242	splx(s);
243
244	return 0;
245}
246
247int
248sndstat_registerfile(char *str)
249{
250	return sndstat_register(NULL, str, NULL);
251}
252
253int
254sndstat_unregister(device_t dev)
255{
256	intrmask_t s;
257	struct sndstat_entry *ent;
258
259	s = spltty();
260	mtx_lock(&sndstat_lock);
261	SLIST_FOREACH(ent, &sndstat_devlist, link) {
262		if (ent->dev == dev) {
263			SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
264			free(ent, M_DEVBUF);
265			mtx_unlock(&sndstat_lock);
266			splx(s);
267
268			return 0;
269		}
270	}
271	mtx_unlock(&sndstat_lock);
272	splx(s);
273
274	return ENXIO;
275}
276
277int
278sndstat_unregisterfile(char *str)
279{
280	intrmask_t s;
281	struct sndstat_entry *ent;
282
283	s = spltty();
284	mtx_lock(&sndstat_lock);
285	SLIST_FOREACH(ent, &sndstat_devlist, link) {
286		if (ent->dev == NULL && ent->str == str) {
287			SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
288			free(ent, M_DEVBUF);
289			sndstat_files--;
290			mtx_unlock(&sndstat_lock);
291			splx(s);
292
293			return 0;
294		}
295	}
296	mtx_unlock(&sndstat_lock);
297	splx(s);
298
299	return ENXIO;
300}
301
302/************************************************************************/
303
304static int
305sndstat_prepare(struct sbuf *s)
306{
307	struct sndstat_entry *ent;
308    	int i, j;
309
310	sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n");
311	if (SLIST_EMPTY(&sndstat_devlist)) {
312		sbuf_printf(s, "No devices installed.\n");
313		sbuf_finish(s);
314    		return sbuf_len(s);
315	}
316
317	sbuf_printf(s, "Installed devices:\n");
318
319    	for (i = 0; i <= sndstat_maxunit; i++) {
320		for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
321			ent = sndstat_find(j, i);
322			if (!ent)
323				continue;
324			sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
325			sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
326			sbuf_printf(s, " %s", ent->str);
327			if (ent->handler)
328				ent->handler(s, ent->dev, sndstat_verbose);
329			else
330				sbuf_printf(s, " [no handler]");
331			sbuf_printf(s, "\n");
332		}
333    	}
334
335	if (sndstat_verbose >= 3 && sndstat_files > 0) {
336		sbuf_printf(s, "\nFile Versions:\n");
337
338		SLIST_FOREACH(ent, &sndstat_devlist, link) {
339			if (ent->dev == NULL && ent->str != NULL)
340				sbuf_printf(s, "%s\n", ent->str);
341		}
342	}
343
344	sbuf_finish(s);
345    	return sbuf_len(s);
346}
347
348static int
349sndstat_init(void)
350{
351	mtx_init(&sndstat_lock, "sndstat", NULL, 0);
352	sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS, UID_ROOT, GID_WHEEL, 0444, "sndstat");
353
354	return (sndstat_dev != 0)? 0 : ENXIO;
355}
356
357static int
358sndstat_uninit(void)
359{
360	intrmask_t s;
361
362	s = spltty();
363	mtx_lock(&sndstat_lock);
364	if (sndstat_isopen) {
365		mtx_unlock(&sndstat_lock);
366		splx(s);
367		return EBUSY;
368	}
369
370	if (sndstat_dev)
371		destroy_dev(sndstat_dev);
372	sndstat_dev = 0;
373
374	splx(s);
375	mtx_destroy(&sndstat_lock);
376	return 0;
377}
378
379int
380sndstat_busy(void)
381{
382	return (sndstat_isopen);
383}
384
385static void
386sndstat_sysinit(void *p)
387{
388	sndstat_init();
389}
390
391static void
392sndstat_sysuninit(void *p)
393{
394	sndstat_uninit();
395}
396
397SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
398SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);
399
400
401