audio_link.c revision 9484:fbd5ddc28e96 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <regex.h>
27#include <devfsadm.h>
28#include <strings.h>
29#include <ctype.h>
30#include <stdlib.h>
31#include <limits.h>
32#include <stdio.h>
33#include <syslog.h>
34#include <bsm/devalloc.h>
35#include <sys/audio.h>
36#include <sys/soundcard.h>
37#include <unistd.h>
38
39#define	MAX_AUDIO_LINK 100
40#define	RE_SIZE 64
41
42extern int system_labeled;
43
44static void check_audio_link(char *secondary_link,
45    const char *primary_link_format);
46
47static int audio_process(di_minor_t minor, di_node_t node);
48static int sndstat_process(di_minor_t minor, di_node_t node);
49
50static devfsadm_create_t audio_cbt[] = {
51	{ "audio", "ddi_audio", NULL,
52	    TYPE_EXACT, ILEVEL_0, audio_process
53	},
54	{ "pseudo", "ddi_pseudo", "audio",
55	    TYPE_EXACT|DRV_EXACT, ILEVEL_0, sndstat_process
56	},
57};
58
59DEVFSADM_CREATE_INIT_V0(audio_cbt);
60
61/*
62 * the following can't be one big RE with a bunch of alterations "|"
63 * because recurse_dev_re() would not work.
64 */
65static devfsadm_remove_t audio_remove_cbt[] = {
66	/*
67	 * Secondary links.
68	 */
69
70	/* /dev/audio, /dev/audioctl, /dev/dsp */
71	{ "audio", "^(audio|audioctl|dsp)$",
72	    RM_POST|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_link
73	},
74	/* /dev/mixer0, /dev/dsp0 */
75	{ "audio", "^(mixer|dsp)[0-9]+$",
76	    RM_POST|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_link
77	},
78	/* /dev/sound/0, 0ctl */
79	{ "audio", "^sound/[0-9]+(ctl)?$",
80	    RM_POST|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_link
81	},
82	/* /dev/mixer */
83	{ "pseudo", "^(mixer)$",
84	    RM_POST|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_link
85	},
86
87	/*
88	 * Primary links.
89	 */
90
91	/* /dev/sndstat */
92	{ "pseudo", "^sndstat$",
93	    RM_PRE|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_all
94	},
95	/* /dev/sound/audio810:0, 0ctl, etc */
96	{ "audio", "^sound/.*:[0-9]+(ctl|dsp|mixer)?$",
97	    RM_PRE|RM_HOT|RM_ALWAYS, ILEVEL_0, devfsadm_rm_all
98	},
99};
100
101DEVFSADM_REMOVE_INIT_V0(audio_remove_cbt);
102
103int
104minor_fini(void)
105{
106	check_audio_link("audio", "sound/%d");
107	check_audio_link("audioctl", "sound/%dctl");
108	check_audio_link("dsp", "dsp%d");
109	return (DEVFSADM_SUCCESS);
110}
111
112
113#define	COPYSUB(to, from, pm, pos) (void) strncpy(to, &from[pm[pos].rm_so], \
114		    pm[pos].rm_eo - pm[pos].rm_so); \
115		    to[pm[pos].rm_eo - pm[pos].rm_so] = 0;
116
117static void
118send_number(long num)
119{
120	char		buf[PATH_MAX+1];
121
122	/*
123	 * This is not safe with -r.
124	 */
125	if (strcmp(devfsadm_root_path(), "/") != 0)
126		return;
127
128	(void) snprintf(buf, sizeof (buf), "/dev/mixer%ld", num);
129	if (device_exists(buf)) {
130		int	fd;
131
132		if ((fd = open(buf, O_RDWR)) < 0)
133			return;
134
135		(void) ioctl(fd, SNDCTL_SUN_SEND_NUMBER, &num);
136		(void) close(fd);
137		devfsadm_print(CHATTY_MID,
138		    "sent devnum audio %ld to %s\n", num, buf);
139	}
140}
141
142static void
143send_all(void)
144{
145	/*
146	 * This module traverses /dev/sound to look for nodes that
147	 * have been previously created.
148	 */
149	finddevhdl_t	fh;
150	const char	*path;
151
152	/*
153	 * This is not safe with -r.
154	 */
155	if ((strcmp(devfsadm_root_path(), "/") == 0) &&
156	    (finddev_readdir("/dev", &fh) == 0)) {
157		static int	doneit = 0;
158
159		while ((!doneit) && ((path = finddev_next(fh)) != NULL)) {
160			long num;
161			char *ep;
162			if ((strncmp(path, "mixer", 5) != 0) ||
163			    (!isdigit(path[5]))) {
164				continue;
165			}
166			num = strtol(path + 5, &ep, 10);
167			send_number(num);
168		}
169		finddev_close(fh);
170		doneit = 1;
171	}
172}
173
174static int
175sndstat_process(di_minor_t minor, di_node_t node)
176{
177	char *mn;
178
179	mn = di_minor_name(minor);
180
181	/*
182	 * "Special" handling for /dev/sndstat and /dev/mixer.
183	 */
184	if (strcmp(mn, "sound,sndstat0") == 0) {
185		(void) devfsadm_mklink("sndstat", node, minor, 0);
186		(void) devfsadm_secondary_link("mixer", "sndstat", 0);
187		send_all();
188	}
189
190	return (DEVFSADM_CONTINUE);
191}
192
193/*
194 * This function is called for every audio node.
195 * Calls enumerate to assign a logical unit id, and then
196 * devfsadm_mklink to make the link.
197 */
198static int
199audio_process(di_minor_t minor, di_node_t node)
200{
201	int flags = 0;
202	char devpath[PATH_MAX + 1];
203	char newpath[PATH_MAX + 1];
204	char *buf;
205	char *mn;
206	char *tmp;
207	char *ep;
208	char re_string[RE_SIZE+1];
209	devfsadm_enumerate_t rules[1] = {NULL};
210
211	if (system_labeled)
212		flags = DA_ADD|DA_AUDIO;
213
214	mn = di_minor_name(minor);
215
216	if ((tmp = di_devfs_path(node)) == NULL) {
217		return (DEVFSADM_CONTINUE);
218	}
219	(void) snprintf(devpath, sizeof (devpath), "%s:%s", tmp, mn);
220	di_devfs_path_free(tmp);
221
222	/*
223	 * "Special" handling for /dev/sndstat and /dev/mixer.
224	 */
225	if (strcmp(mn, "sound,sndstat0") == 0) {
226		(void) strlcpy(newpath, "sound/sndstat", sizeof (newpath));
227
228		(void) devfsadm_mklink(newpath, node, minor, flags);
229		(void) devfsadm_secondary_link("sndstat", newpath, flags);
230		(void) devfsadm_secondary_link("mixer", newpath, flags);
231		send_all();
232		return (DEVFSADM_CONTINUE);
233	}
234
235	if (strncmp(mn, "sound,", 6) == 0) {
236		char base[PATH_MAX + 1];
237		char linksrc[PATH_MAX + 1];
238		char linkdst[PATH_MAX + 1];
239		long num;
240		long inst;
241		int i;
242		char *driver;
243
244		/* strlen("sound,") */
245		(void) strlcpy(base, mn + 6, sizeof (base));
246		mn = base;
247
248		driver = di_driver_name(node);
249
250		/* if driver name override in minor name */
251		if ((tmp = strchr(mn, ',')) != NULL) {
252			driver = mn;
253			*tmp = '\0';
254			mn = tmp + 1;
255		}
256
257		/* skip past "audio" portion of the minor name */
258		if (strncmp(mn, "audio", 5) == 0) {
259			mn += 5;
260		}
261
262		/* parse the instance number */
263		for (i = strlen(mn); i; i--) {
264			if (!isdigit(mn[i - 1]))
265				break;
266		}
267		inst = strtol(mn + i, &ep, 10);
268		mn[i] = 0;	/* lop off the instance number */
269
270		/*
271		 * First we create a node with the driver under /dev/sound.
272		 * Note that "instance numbers" used by the audio framework
273		 * are guaranteed to be unique for each driver.
274		 */
275		(void) snprintf(newpath, sizeof (newpath), "sound/%s:%d%s",
276		    driver, inst, mn);
277		(void) devfsadm_mklink(newpath, node, minor, flags);
278
279		/*
280		 * The rest of this logic is a gross simplification that
281		 * is made possible by the fact that each audio node will
282		 * have several different minors associated with it.  Rather
283		 * processing each node separately, we just create the links
284		 * all at once.
285		 *
286		 * This reduces the chances of the various links being out
287		 * of sync with each other.
288		 */
289		if (strcmp(mn, "mixer") != 0) {
290			return (DEVFSADM_CONTINUE);
291		}
292
293		/*
294		 * Its the control node, so create the various
295		 * secondary links.
296		 */
297
298		/*
299		 * We want a match against the physical path
300		 * without the minor name component.
301		 */
302		(void) snprintf(re_string, RE_SIZE, "%s", "^mixer([0-9]+)");
303		rules[0].re = re_string;
304		rules[0].subexp = 1;
305		rules[0].flags = MATCH_ALL;
306
307		/*
308		 * enumerate finds the logical audio id, and stuffs
309		 * it in buf
310		 */
311		(void) strlcpy(devpath, newpath, sizeof (devpath));
312		if (devfsadm_enumerate_int(devpath, 0, &buf, rules, 1)) {
313			return (DEVFSADM_CONTINUE);
314		}
315		num = strtol(buf, &ep, 10);
316		free(buf);
317
318		/* /dev/sound/0 */
319		(void) snprintf(linksrc, sizeof (linksrc), "sound/%s:%ld",
320		    driver, inst);
321		(void) snprintf(linkdst, sizeof (linkdst), "sound/%ld", num);
322		(void) devfsadm_secondary_link(linkdst, linksrc, flags);
323
324		(void) snprintf(linksrc, sizeof (linksrc), "sound/%s:%ldctl",
325		    driver, inst);
326		(void) snprintf(linkdst, sizeof (linkdst), "sound/%ldctl", num);
327		(void) devfsadm_secondary_link(linkdst, linksrc, flags);
328
329		(void) snprintf(linksrc, sizeof (linksrc), "sound/%s:%lddsp",
330		    driver, inst);
331		(void) snprintf(linkdst, sizeof (linkdst), "dsp%ld", num);
332		(void) devfsadm_secondary_link(linkdst, linksrc, flags);
333
334		(void) snprintf(linksrc, sizeof (linksrc), "sound/%s:%ldmixer",
335		    driver, inst);
336		(void) snprintf(linkdst, sizeof (linkdst), "mixer%ld", num);
337		(void) devfsadm_secondary_link(linkdst, linksrc, flags);
338
339		/* Send control number */
340		send_number(num);
341
342		return (DEVFSADM_CONTINUE);
343	}
344
345	if (strncmp(mn, "internal,", 9) == 0) {
346		/* we don't set up internal nodes in /dev */
347		return (DEVFSADM_CONTINUE);
348	}
349
350	devfsadm_errprint("SUNW_audio_link: can't find match for'%s'\n", mn);
351	return (DEVFSADM_CONTINUE);
352}
353
354static void
355check_audio_link(char *secondary, const char *primary_format)
356{
357	char primary[PATH_MAX + 1];
358	int i;
359	int flags = 0;
360
361	/* if link is present, return */
362	if (devfsadm_link_valid(secondary) == DEVFSADM_TRUE) {
363		return;
364	}
365
366	if (system_labeled)
367		flags = DA_ADD|DA_AUDIO;
368
369	for (i = 0; i < MAX_AUDIO_LINK; i++) {
370		(void) sprintf(primary, primary_format, i);
371		if (devfsadm_link_valid(primary) == DEVFSADM_TRUE) {
372			/* we read link to get it to the master "real" link */
373			(void) devfsadm_secondary_link(secondary,
374			    primary, flags);
375			break;
376		}
377	}
378}
379