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ALSA: usb-audio: make param quirk_flags change-able in runtime

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Change its permision from 0644 to 0444, and add runtime processing.

Developers now can change it during sysfs, without rebooting, for
debugging new buggy devices.

Co-developed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Cryolitia PukNgae
2025-09-28 11:08:01 +08:00
committed by Takashi Iwai
parent ffd586126a
commit 98b5427bb6
1 changed files with 23 additions and 2 deletions
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sound/usb/card.c
+23 -2
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@@ -103,13 +103,32 @@ module_param_array(delayed_register, charp, NULL, 0444);
MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
module_param_array(implicit_fb, bool, NULL, 0444);
MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
module_param_array(quirk_flags, charp, NULL, 0444);
MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
/* protects quirk_flags */
static DEFINE_MUTEX(quirk_flags_mutex);
static int param_set_quirkp(const char *val,
const struct kernel_param *kp)
{
guard(mutex)(&quirk_flags_mutex);
return param_set_charp(val, kp);
}
static const struct kernel_param_ops param_ops_quirkp = {
.set = param_set_quirkp,
.get = param_get_charp,
.free = param_free_charp,
};
#define param_check_quirkp param_check_charp
module_param_array(quirk_flags, quirkp, NULL, 0644);
MODULE_PARM_DESC(quirk_flags, "Add/modify USB audio quirks");
/*
* we keep the snd_usb_audio_t instances by ourselves for merging
* the all interfaces on the same card as one sound device.
@@ -696,6 +715,8 @@ static void snd_usb_init_quirk_flags(int idx, struct snd_usb_audio *chip)
{
size_t i;
guard(mutex)(&quirk_flags_mutex);
/* old style option found: the position-based integer value */
if (quirk_flags[idx] &&
!kstrtou32(quirk_flags[idx], 0, &chip->quirk_flags)) {