126f7051b4
Pull sound updates from Takashi Iwai:
"We've got many code additions at this cycle as a result of quite a few
new drivers. Below are highlights:
Core stuff:
- Fix the long-standing issue with the device registration order; the
control device is now registered at last
- PCM locking code cleanups for RT kernels
- Fixes for possible races in ALSA timer resolution accesses
- TLV offset definitions in uapi
ASoC:
- Many fixes for the topology stuff, including fixes for v4 ABI
compatibility
- Lots of cleanups / quirks for Intel platforms based on Realtek
CODECs
- Continued componentization works, removing legacy CODEC stuff
- Conversion of OMAP DMA to the new, more standard SDMA-PCM driver
- Fixes and updates to Cirrus Logic SoC drivers
- New Qualcomm DSP support
- New drivers for Analog SSM2305, Atmel I2S controllers, Mediatek
MT6351, MT6797 and MT7622, Qualcomm DSPs, Realtek RT1305, RT1306
and RT5668 and TI TSCS454
HD-audio:
- Finally better support for some CA0132 boards, allowing Windows
firmware
- HP Spectre x360 support along with a bulk of COEF stuff
- Blacklisting power save default some known boards reported on
Fedora
USB-audio:
- Continued improvements on UAC3 support; now BADD is supported
- Fixes / improvements for Dell WD15 dock
- Allow DMA coherent pages for PCM buffers for ARCH, MIPS & co
Others:
- New Xen sound frontend driver support
- Cache implementation and other improvements for FireWire DICE
- Conversions to octal permissions in allover places"
* tag 'sound-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (386 commits)
ASoC: dapm: delete dapm_kcontrol_data paths list before freeing it
ALSA: usb-audio: remove redundant check on err
ASoC: topology: Move skl-tplg-interface.h to uapi
ASoC: topology: Move v4 manifest header data structures to uapi
ASoC: topology: Improve backwards compatibility with v4 topology files
ALSA: pci/hda: Remove unused, broken, header file
ASoC: TSCS454: Add Support
ASoC: Intel: kbl: Move codec sysclk config to codec_init function
ASoC: simple-card: set cpu dai clk in hw_params
ALSA: hda - Handle kzalloc() failure in snd_hda_attach_pcm_stream()
ALSA: oxygen: use match_string() helper
ASoC: dapm: use match_string() helper
ASoC: max98095: use match_string() helper
ASoC: max98088: use match_string() helper
ASoC: Intel: bytcr_rt5651: Set card long_name based on quirks
ASoC: mt6797-mt6351: add hostless phone call path
ASoC: mt6797: add Hostless DAI
ASoC: mt6797: add PCM interface
ASoC: mediatek: export mtk-afe symbols as needed
ASoC: codecs: PCM1789: include gpio/consumer.h
...
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====================
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ASoC Platform Driver
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====================
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An ASoC platform driver class can be divided into audio DMA drivers, SoC DAI
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drivers and DSP drivers. The platform drivers only target the SoC CPU and must
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have no board specific code.
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Audio DMA
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=========
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The platform DMA driver optionally supports the following ALSA operations:-
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::
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/* SoC audio ops */
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struct snd_soc_ops {
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int (*startup)(struct snd_pcm_substream *);
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void (*shutdown)(struct snd_pcm_substream *);
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int (*hw_params)(struct snd_pcm_substream *, struct snd_pcm_hw_params *);
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int (*hw_free)(struct snd_pcm_substream *);
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int (*prepare)(struct snd_pcm_substream *);
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int (*trigger)(struct snd_pcm_substream *, int);
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};
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The platform driver exports its DMA functionality via struct
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snd_soc_component_driver:-
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::
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struct snd_soc_component_driver {
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const char *name;
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...
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int (*probe)(struct snd_soc_component *);
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void (*remove)(struct snd_soc_component *);
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int (*suspend)(struct snd_soc_component *);
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int (*resume)(struct snd_soc_component *);
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/* pcm creation and destruction */
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int (*pcm_new)(struct snd_soc_pcm_runtime *);
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void (*pcm_free)(struct snd_pcm *);
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...
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const struct snd_pcm_ops *ops;
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const struct snd_compr_ops *compr_ops;
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...
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};
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Please refer to the ALSA driver documentation for details of audio DMA.
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http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
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An example DMA driver is soc/pxa/pxa2xx-pcm.c
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SoC DAI Drivers
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===============
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Each SoC DAI driver must provide the following features:-
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1. Digital audio interface (DAI) description
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2. Digital audio interface configuration
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3. PCM's description
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4. SYSCLK configuration
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5. Suspend and resume (optional)
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Please see codec.rst for a description of items 1 - 4.
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SoC DSP Drivers
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===============
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Each SoC DSP driver usually supplies the following features :-
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1. DAPM graph
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2. Mixer controls
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3. DMA IO to/from DSP buffers (if applicable)
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4. Definition of DSP front end (FE) PCM devices.
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Please see DPCM.txt for a description of item 4.
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