kernel/linux.git/include/sound/control.h, branch v6.6.132

ALSA: vmaster: Add snd_ctl_add_followers() helper

2023-07-21T07:37:47+00:00

Add a new helper to add multiple vmaster followers in a shot. The same function was open-coded in various places, and this helper replaces them. Link: https://lore.kernel.org/r/20230721071643.3631-2-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: Introduce snd_ctl_find_id_mixer()

2023-07-21T07:10:38+00:00

A commonly seen pattern is to run snd_ctl_find_id() for a mixer control element with a given string. Let's provide a standard helper for achieving that for simplifying the code. Link: https://lore.kernel.org/r/20230720082108.31346-2-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: Introduce unlocked version for snd_ctl_find_*() helpers

2023-07-20T08:03:00+00:00

For reducing the unnecessary use of controls_rwsem in the drivers, this patch adds a new variant for snd_ctl_find_*() helpers: snd_ctl_find_id_locked() and snd_ctl_find_numid_locked() look for a kctl element inside the card->controls_rwsem -- that is, doing the very same as what snd_ctl_find_id() and snd_ctl_find_numid() did until now. snd_ctl_find_id() and snd_ctl_find_numid() remain same, i.e. still unlocked version, but they will be switched to locked version once after all callers are replaced. The patch also replaces the calls of snd_ctl_find_id() and snd_ctl_find_numid() in a few places; all of those are places where we know that the functions are called properly with controls_rwsem held. All others are without rwsem (although they should have been). After this patch, we'll turn on the locking in snd_ctl_find_id() and snd_ctl_find_numid() to be more race-free. Link: https://lore.kernel.org/r/20230718141304.1032-10-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: Make snd_ctl_find_id() argument const

2023-07-20T08:02:59+00:00

The id object passed to snd_ctl_find_id() is only read, and we can mark it with const gracefully. Link: https://lore.kernel.org/r/20230718141304.1032-9-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: add snd_ctl_rename()

2022-10-21T06:17:08+00:00

Add a snd_ctl_rename() function that takes care of updating the control hash entries for callers that already have the relevant struct snd_kcontrol at hand and hold the control write lock (or simply haven't registered the card yet). Fixes: c27e1efb61c5 ("ALSA: control: Use xarray for faster lookups") Cc: stable@vger.kernel.org Signed-off-by: Maciej S. Szmigiero Link: https://lore.kernel.org/r/4170b71117ea81357a4f7eb8410f7cde20836c70.1666296963.git.maciej.szmigiero@oracle.com Signed-off-by: Takashi Iwai

ALSA: control: Use deferred fasync helper

2022-07-29T10:57:12+00:00

For avoiding the potential deadlock via kill_fasync() call, use the new fasync helpers to defer the invocation from the control API. Note that it's merely a workaround. Another note: although we haven't received reports about the deadlock with the control API, the deadlock is still potentially possible, and it's better to align the behavior with other core APIs (PCM and timer); so let's move altogether. Link: https://lore.kernel.org/r/20220728125945.29533-5-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: Rename CONFIG_SND_CTL_VALIDATION to CONFIG_SND_CTL_DEBUG

2022-06-15T05:45:27+00:00

The purpose of CONFIG_SND_CTL_VALIDATION is rather to enable the debugging feature for the control API. The validation is only a part of it. Let's rename it to be more explicit and intuitive. While we're at it, let's advertise, give more comment to recommend this feature for development in the kconfig help text. Link: https://lore.kernel.org/r/20220609120219.3937-3-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control - add generic LED trigger module as the new control layer

2021-03-30T13:33:58+00:00

The recent laptops have usually two LEDs assigned to reflect the speaker and microphone mute state. This implementation adds a tiny layer on top of the control API which calculates the state for those LEDs using the driver callbacks. Two new access flags are introduced to describe the controls which affects the audio path settings (an easy code change for drivers). The LED resource can be shared with multiple sound cards with this code. The user space controls may be added to the state chain on demand, too. This code should replace the LED code in the HDA driver and add a possibility to easy extend the other drivers (ASoC codecs etc.). Signed-off-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20210317172945.842280-4-perex@perex.cz Signed-off-by: Takashi Iwai

ALSA: control - add layer registration routines

2021-03-30T13:33:13+00:00

The layer registration allows to handle an extra functionality on top of the control API. It can be used for the audio LED control for example. Signed-off-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20210317172945.842280-3-perex@perex.cz Signed-off-by: Takashi Iwai

ALSA: control - introduce snd_ctl_notify_one() helper

2021-03-30T13:33:03+00:00

This helper is required for the following generic LED mute patch. The helper also simplifies some other functions. Signed-off-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20210317172945.842280-2-perex@perex.cz Signed-off-by: Takashi Iwai