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authorHui Wang <hui.wang@canonical.com>2021-01-27 11:56:39 +0300
committerTakashi Iwai <tiwai@suse.de>2021-02-02 12:37:07 +0300
commit2d670ea2bd53a9792f453bb5b97cb8ef695988ff (patch)
tree4360995bf3889604b209a6f5da273043a481f586 /sound/core/Kconfig
parentda2a040ee7cfe1dd57d5bec7906cb979c5787a86 (diff)
downloadlinux-2d670ea2bd53a9792f453bb5b97cb8ef695988ff.tar.xz
ALSA: jack: implement software jack injection via debugfs
This change adds audio jack injection feature through debugfs, with this feature, we could validate alsa userspace changes by injecting plugin or plugout events to the non-phantom audio jacks. With this change, the sound core will build the folders $debugfs_mount_dir/sound/cardN if SND_DEBUG and DEBUG_FS are enabled. And if users also enable the SND_JACK_INJECTION_DEBUG, the jack injection nodes will be built in the folder cardN like below: $tree $debugfs_mount_dir/sound $debugfs_mount_dir/sound ├── card0 │   ├── HDMI_DP_pcm_10_Jack │   │   ├── jackin_inject │   │   ├── kctl_id │   │   ├── mask_bits │   │   ├── status │   │   ├── sw_inject_enable │   │   └── type ... │   └── HDMI_DP_pcm_9_Jack │   ├── jackin_inject │   ├── kctl_id │   ├── mask_bits │   ├── status │   ├── sw_inject_enable │   └── type └── card1 ├── HDMI_DP_pcm_5_Jack │   ├── jackin_inject │   ├── kctl_id │   ├── mask_bits │   ├── status │   ├── sw_inject_enable │   └── type ... ├── Headphone_Jack │   ├── jackin_inject │   ├── kctl_id │   ├── mask_bits │   ├── status │   ├── sw_inject_enable │   └── type └── Headset_Mic_Jack ├── jackin_inject ├── kctl_id ├── mask_bits ├── status ├── sw_inject_enable └── type The nodes kctl_id, mask_bits, status and type are read-only, users could check jack or jack_kctl's information through them. The nodes sw_inject_enable and jackin_inject are directly used for injection. The sw_inject_enable is read-write, users could check if software injection is enabled or not on this jack, and users could echo 1 or 0 to enable or disable software injection on this jack. Once the injection is enabled, the jack will not change by hardware events anymore, once the injection is disabled, the jack will restore the last reported hardware events to the jack. The jackin_inject is write-only, if the injection is enabled, users could echo 1 or 0 to this node to inject plugin or plugout events to this jack. For the detailed usage information on these nodes, please refer to Documentation/sound/designs/jack-injection.rst. Reviewed-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Signed-off-by: Hui Wang <hui.wang@canonical.com> Link: https://lore.kernel.org/r/20210127085639.74954-2-hui.wang@canonical.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/Kconfig')
-rw-r--r--sound/core/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index d4554f376160..a4050f87f230 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -187,6 +187,15 @@ config SND_CTL_VALIDATION
from the driver are in the proper ranges or the check of the invalid
access at out-of-array areas.
+config SND_JACK_INJECTION_DEBUG
+ bool "Sound jack injection interface via debugfs"
+ depends on SND_JACK && SND_DEBUG && DEBUG_FS
+ help
+ This option can be used to enable or disable sound jack
+ software injection.
+ Say Y if you are debugging via jack injection interface.
+ If unsure select "N".
+
config SND_VMASTER
bool