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module-alsa-card: handle udev PULSE_MODARGS

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Allow adding module arguments using udev PULSE_MODARGS environment variable and
fail module loading if there is a problem with PULSE_MODARGS

This helps setting e.g. 'tsched=0' for specific devices without a need to create
full load module entry in default.pa.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/436>
This commit is contained in:
Igor V. Kovalenko 2020-12-13 13:09:19 +03:00
parent 19e34d8d5b
commit d15b31d751
3 changed files with 77 additions and 0 deletions
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44
src/modules/alsa/module-alsa-card.c
View file

@ -104,6 +104,8 @@ static const char* const valid_modargs[] = {
#define DEFAULT_DEVICE_ID "0"
#define PULSE_MODARGS "PULSE_MODARGS"
struct userdata {
pa_core *core;
pa_module *module;
@ -820,6 +822,7 @@ int pa__init(pa_module *m) {
const char *description;
const char *profile_str = NULL;
char *fn = NULL;
char *udev_args = NULL;
bool namereg_fail = false;
int err = -PA_MODULE_ERR_UNSPECIFIED, rval;
@ -849,6 +852,47 @@ int pa__init(pa_module *m) {
goto fail;
}
#ifdef HAVE_UDEV
udev_args = pa_udev_get_property(u->alsa_card_index, PULSE_MODARGS);
#endif
if (udev_args) {
bool udev_modargs_success = true;
pa_modargs *temp_ma = pa_modargs_new(udev_args, valid_modargs);
if (temp_ma) {
/* do not try to replace device_id */
if (pa_modargs_remove_key(temp_ma, "device_id") == 0) {
pa_log_warn("Unexpected 'device_id' module argument override ignored from udev " PULSE_MODARGS "='%s'", udev_args);
}
/* Implement modargs override by copying original module arguments
* over udev entry arguments ignoring duplicates. */
if (pa_modargs_merge_missing(temp_ma, u->modargs, valid_modargs) == 0) {
/* swap module arguments */
pa_modargs *old_ma = u->modargs;
u->modargs = temp_ma;
temp_ma = old_ma;
pa_log_info("Applied module arguments override from udev " PULSE_MODARGS "='%s'", udev_args);
} else {
pa_log("Failed to apply module arguments override from udev " PULSE_MODARGS "='%s'", udev_args);
udev_modargs_success = false;
}
pa_modargs_free(temp_ma);
} else {
pa_log("Failed to parse module arguments from udev " PULSE_MODARGS "='%s'", udev_args);
udev_modargs_success = false;
}
pa_xfree(udev_args);
if (!udev_modargs_success)
goto fail;
}
if (pa_modargs_get_value_boolean(u->modargs, "ignore_dB", &ignore_dB) < 0) {
pa_log("Failed to parse ignore_dB argument.");
goto fail;