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udev: rework modem detection a bit

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Check every single pcm device of a card whether it is a modem.
This commit is contained in:
Lennart Poettering 2010-01-14 02:06:52 +01:00
parent 63c968bf77
commit acb4996203
1 changed files with 62 additions and 55 deletions
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117
src/modules/module-udev-detect.c
View file

@ -103,17 +103,70 @@ static const char *path_get_card_id(const char *path) {
return e + 5;
}
static const char *pa_udev_get_sysattr(const char *card_idx, const char *name);
static char *card_get_sysattr(const char *card_idx, const char *name) {
struct udev *udev;
struct udev_device *card = NULL;
char *t, *r = NULL;
const char *v;
pa_assert(card_idx);
pa_assert(name);
if (!(udev = udev_new())) {
pa_log_error("Failed to allocate udev context.");
goto finish;
}
t = pa_sprintf_malloc("%s/class/sound/card%s", udev_get_sys_path(udev), card_idx);
card = udev_device_new_from_syspath(udev, t);
pa_xfree(t);
if (!card) {
pa_log_error("Failed to get card object.");
goto finish;
}
if ((v = udev_device_get_sysattr_value(card, name)) && *v)
r = pa_xstrdup(v);
finish:
if (card)
udev_device_unref(card);
if (udev)
udev_unref(udev);
return r;
}
static pa_bool_t pcm_is_modem(const char *card_idx, const char *pcm) {
char *sysfs_path, *pcm_class;
pa_bool_t is_modem;
pa_assert(card_idx);
pa_assert(pcm);
/* Check /sys/class/sound/card.../pcmC...../pcm_class. An HDA
* modem can be used simultaneously with generic
* playback/record. */
sysfs_path = pa_sprintf_malloc("pcmC%sD%s/pcm_class", card_idx, pcm);
pcm_class = card_get_sysattr(card_idx, sysfs_path);
is_modem = pcm_class && pa_streq(pcm_class, "modem");
pa_xfree(pcm_class);
pa_xfree(sysfs_path);
return is_modem;
}
static pa_bool_t is_card_busy(const char *id) {
const char *pcm_class;
char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL,
*sysfs_path = NULL;
char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL;
DIR *card_dir = NULL, *pcm_dir = NULL;
FILE *status_file = NULL;
size_t len;
struct dirent *space = NULL, *de;
pa_bool_t busy = FALSE, is_modem = FALSE;
pa_bool_t busy = FALSE;
int r;
pa_assert(id);
@ -131,17 +184,6 @@ static pa_bool_t is_card_busy(const char *id) {
len = offsetof(struct dirent, d_name) + fpathconf(dirfd(card_dir), _PC_NAME_MAX) + 1;
space = pa_xmalloc(len);
/* Also check /sys/class/sound/card.../pcmC...D6p/pcm_class. An HDA
* modem can be used simultaneously with generic playback/record. */
pa_xfree(sysfs_path);
sysfs_path = pa_sprintf_malloc("pcmC%sD6p/pcm_class", id);
pcm_class = pa_udev_get_sysattr(id, sysfs_path);
if (pcm_class && pa_streq(pcm_class, "modem"))
is_modem = TRUE;
for (;;) {
de = NULL;
@ -156,6 +198,9 @@ static pa_bool_t is_card_busy(const char *id) {
if (!pa_startswith(de->d_name, "pcm"))
continue;
if (pcm_is_modem(id, de->d_name + 3))
continue;
pa_xfree(pcm_path);
pcm_path = pa_sprintf_malloc("%s/%s", card_path, de->d_name);
@ -197,7 +242,7 @@ static pa_bool_t is_card_busy(const char *id) {
continue;
}
if (!is_modem && !pa_streq(line, "closed\n")) {
if (!pa_streq(line, "closed\n")) {
busy = TRUE;
break;
}
@ -208,7 +253,6 @@ fail:
pa_xfree(card_path);
pa_xfree(pcm_path);
pa_xfree(sysfs_path);
pa_xfree(sub_status);
pa_xfree(space);
@ -610,43 +654,6 @@ static int setup_inotify(struct userdata *u) {
return 0;
}
static const char *pa_udev_get_sysattr(const char *card_idx, const char *name) {
struct udev *udev;
struct udev_device *card = NULL;
char *t, *r = NULL;
const char *v;
pa_assert(card_idx);
pa_assert(name);
if (!(udev = udev_new())) {
pa_log_error("Failed to allocate udev context.");
goto finish;
}
t = pa_sprintf_malloc("%s/class/sound/card%s", udev_get_sys_path(udev), card_idx);
card = udev_device_new_from_syspath(udev, t);
pa_xfree(t);
if (!card) {
pa_log_error("Failed to get card object.");
goto finish;
}
if ((v = udev_device_get_sysattr_value(card, name)) && *v)
r = pa_xstrdup(v);
finish:
if (card)
udev_device_unref(card);
if (udev)
udev_unref(udev);
return r;
}
int pa__init(pa_module *m) {
struct userdata *u = NULL;
pa_modargs *ma;