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| author | Takashi Iwai <tiwai@suse.de> | 2021-07-01 08:36:12 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-07-01 08:36:12 +0200 |
| commit | 50de417b7a5bfe8ab5c571427703f67c934736dc (patch) | |
| tree | c791889f8e1c325e286eea593743cc4a24732e07 /Documentation/sound | |
| parent | 459d2320dc21bd69533589d2f0a37ca942edefb7 (diff) | |
| parent | 192664528154a84fab4e6d820f9cb2e2e0835544 (diff) | |
| download | linux-50de417b7a5bfe8ab5c571427703f67c934736dc.tar.bz2 | |
Merge tag 'asoc-v5.14' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Updates for v5.14
This release sees a nice new feature in the core from Morimoto-san,
support for automatic negotiation of DAI formats between the components
on the link. Otherwise the big highlight was the merging of the Tegra
machine drivers into a single driver avoiding a bunch of duplication.
- Support for automatic negotiation of DAI formats.
- Accessory detection support for several Qualcomm parts.
- Support for IEC958 control with hdmi-codec.
- Merging of Tegra machine drivers into a single driver.
- Support for AmLogic SM1 TOACODEC, Intel AlderLake-M, several NXP
i.MX8 variants, NXP TFA1 and TDF9897, Rockchip RK817, Qualcomm
Quinary MI2S, Texas Instruments TAS2505
Diffstat (limited to 'Documentation/sound')
| -rw-r--r-- | Documentation/sound/kernel-api/writing-an-alsa-driver.rst | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst index e6365836fa8b..01d59b8aea92 100644 --- a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst +++ b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst @@ -3508,14 +3508,15 @@ field must be set, though). “IEC958 Playback Con Mask” is used to return the bit-mask for the IEC958 status bits of consumer mode. Similarly, “IEC958 Playback Pro Mask” -returns the bitmask for professional mode. They are read-only controls, -and are defined as MIXER controls (iface = -``SNDRV_CTL_ELEM_IFACE_MIXER``). +returns the bitmask for professional mode. They are read-only controls. Meanwhile, “IEC958 Playback Default” control is defined for getting and -setting the current default IEC958 bits. Note that this one is usually -defined as a PCM control (iface = ``SNDRV_CTL_ELEM_IFACE_PCM``), -although in some places it's defined as a MIXER control. +setting the current default IEC958 bits. + +Due to historical reasons, both variants of the Playback Mask and the +Playback Default controls can be implemented on either a +``SNDRV_CTL_ELEM_IFACE_PCM`` or a ``SNDRV_CTL_ELEM_IFACE_MIXER`` iface. +Drivers should expose the mask and default on the same iface though. In addition, you can define the control switches to enable/disable or to set the raw bit mode. The implementation will depend on the chip, but |