ASoC - Revision history

Norbert: updating link, adding reference to kernel documentation and one book.

2023-02-14T03:36:25Z

updating link, adding reference to kernel documentation and one book.

← Older revision		Revision as of 03:36, 14 February 2023
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	ASoC is currently still work in progress with most features implemented and support for the PXA2xx, AT91xx and S3C24xx SoC's now in the mainline kernel.		ASoC is currently still work in progress with most features implemented and support for the PXA2xx, AT91xx and S3C24xx SoC's now in the mainline kernel.

			An overview is given in the [https://docs.kernel.org/sound/soc/overview.html Linux kernel documentation].

	==Design==		==Design==
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	==Supported Codecs==		==Supported Codecs==

	As the number of supported audio codecs is growing all the time, the latest supported codecs can be found from the latest [~~http~~://~~lxr~~.~~free-electrons~~.com/source/sound/soc/codecs~~/?v=4.1~~ Linux kernel source].		As the number of supported audio codecs is growing all the time, the latest supported codecs can be found from the latest [https://elixir.bootlin.com/linux/latest/source/sound/soc/codecs Linux kernel source].

	==Development==		==Development==
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	There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net and libra.chat.		There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net and libra.chat.

			A detailed description of the ASoC layer and the development of platform, codec and machine drivers is available in the book "Mastering Linux Device Driver Development" by John Madieu (ISBN: 978-1789342048).

	[[Category:Development]]		[[Category:Development]]
	[[Category:MigratedFromDev]]		[[Category:MigratedFromDev]]

Norbert at 01:34, 11 February 2023

2023-02-11T01:34:59Z

← Older revision		Revision as of 01:34, 11 February 2023
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	ASoC development takes place in the dev branch of the Wolfson [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=summary ASoC git tree] and the kernel.org [http://git.kernel.org/?p=linux/kernel/git/lrg/asoc-2.6.git;a=summary ASoC git tree]. Both trees are in sync with each other.		ASoC development takes place in the dev branch of the Wolfson [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=summary ASoC git tree] and the kernel.org [http://git.kernel.org/?p=linux/kernel/git/lrg/asoc-2.6.git;a=summary ASoC git tree]. Both trees are in sync with each other.

	There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net.		There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net and libra.chat.

	[[Category:Development]]		[[Category:Development]]
	[[Category:MigratedFromDev]]		[[Category:MigratedFromDev]]

Sachinpandhare: spelling correction

2016-06-03T15:18:11Z

spelling correction

← Older revision		Revision as of 15:18, 3 June 2016
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	The overall project goal of the '''ALSA System on Chip''' (ASoC) layer is to provide better ALSA support for embedded system on chip procesors (e.g. pxa2xx, au1x00, iMX, etc) and portable audio codecs. Currently there is some support in the kernel for SoC audio, however it has some limitations:		The overall project goal of the '''ALSA System on Chip''' (ASoC) layer is to provide better ALSA support for embedded system on chip procesors (e.g. pxa2xx, au1x00, iMX, etc) and portable audio codecs. Currently there is some support in the kernel for SoC audio, however it has some limitations:
	* Currently, codec drivers are often tightly coupled to the underlying SoC cpu. This is not really ideal and leads to code duplication i.e. Linux now has 4 different wm8731 drivers for 4 different SoC platforms.		* Currently, codec drivers are often tightly coupled to the underlying SoC cpu. This is not really ideal and leads to code duplication i.e. Linux now has 4 different wm8731 drivers for 4 different SoC platforms.
	* There is no standard method to signal user initiated audio events. e.g. Headphone/Mic insertion, Headphone/Mic detection after an insertion event. These are quite common events on portable devices and ~~ofter~~ require machine specific code to re route audio, enable amps etc after such an event.		* There is no standard method to signal user initiated audio events. e.g. Headphone/Mic insertion, Headphone/Mic detection after an insertion event. These are quite common events on portable devices and often require machine specific code to re route audio, enable amps etc after such an event.
	* Current drivers tend to power up the entire codec when playing (or recording) audio. This is fine for a PC, but tends to waste a lot of power on portable devices. There is also no support for saving power via changing codec oversampling rates, bias currents, etc.		* Current drivers tend to power up the entire codec when playing (or recording) audio. This is fine for a PC, but tends to waste a lot of power on portable devices. There is also no support for saving power via changing codec oversampling rates, bias currents, etc.

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	* Codec driver: The codec driver is platform independent and contains audio controls, audio interface capabilities, codec dapm definition and codec IO functions.		* Codec driver: The codec driver is platform independent and contains audio controls, audio interface capabilities, codec dapm definition and codec IO functions.
	* Platform driver: The platform driver contains the audio dma engine and audio interface drivers (e.g. I2S, AC97, PCM) for that platform.		* Platform driver: The platform driver contains the audio dma engine and audio interface drivers (e.g. I2S, AC97, PCM) for that platform.
	* Machine driver: The machine driver handles any machine specific controls and audio events. i.e. ~~turing~~ on an amp at start of playback.		* Machine driver: The machine driver handles any machine specific controls and audio events. i.e. turning on an amp at start of playback.

	==Supported SoCs==		==Supported SoCs==

Dbp: Updated linux kernel source link

2015-10-14T06:58:24Z

Updated linux kernel source link

← Older revision		Revision as of 06:58, 14 October 2015
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	==Supported Codecs==		==Supported Codecs==

	As the number of supported audio codecs is growing all the time, ~~this~~ [http://~~opensource~~.~~wolfsonmicro~~.com/~~cgi-bin~~/~~gitweb.cgi?p=linux-2.6-asoc.git;a=tree;f=~~sound/soc/codecs~~;hb~~=~~dev link~~] ~~shows the supported codecs currently in the ASoC development branch~~.		As the number of supported audio codecs is growing all the time, the latest supported codecs can be found from the latest [http://lxr.free-electrons.com/source/sound/soc/codecs/?v=4.1 Linux kernel source].

	==Development==		==Development==

Lekernel: /* Supported SoCs */

2010-02-24T22:17:46Z

Supported SoCs

← Older revision		Revision as of 22:17, 24 February 2010
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	* Freescale i.MX21 (I2S)		* Freescale i.MX21 (I2S)
	* Cirrus EP93xx (I2S)		* Cirrus EP93xx (I2S)
			* Milkymist (AC97)

	==Supported Codecs==		==Supported Codecs==

Lrg: /* Development */

2008-06-13T10:51:40Z

Development

← Older revision		Revision as of 10:51, 13 June 2008
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	==Development==		==Development==

	ASoC development takes place in the dev branch of the [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=summary ASoC git tree]. There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net.		ASoC development takes place in the dev branch of the Wolfson [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=summary ASoC git tree] and the kernel.org [http://git.kernel.org/?p=linux/kernel/git/lrg/asoc-2.6.git;a=summary ASoC git tree]. Both trees are in sync with each other.

			There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net.

	[[Category:Development]]		[[Category:Development]]
	[[Category:MigratedFromDev]]		[[Category:MigratedFromDev]]

Lrg: /* Supported SoCs */

2008-06-13T10:40:24Z

Supported SoCs

← Older revision		Revision as of 10:40, 13 June 2008
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	The following SoC CPUs are currently supported:		The following SoC CPUs are currently supported:
	* Intel/Marvell PXA2xx and PXA3xx (AC97, I2S & PCM)		* Intel/Marvell PXA2xx and PXA3xx (AC97, I2S & PCM)
	* Atmel ~~AT91xxxx~~ (I2S ~~& PCM~~)		* Atmel AT91 and AVR32 (I2S)
	* Samsung S3C24xx (AC97 & I2S)		* Samsung S3C24xx (AC97 & I2S)
	* Freescale i.MX31 (I2S & PCM)		* Freescale i.MX31 (I2S & PCM)
	* Renesas SH7760 (AC97 & I2S)		* Renesas SH7760 (AC97 & I2S)
			* TI OMAP (I2S)
			* ADI Blackfin (AC97 & I2S)
			* TI DaVinci (I2S)
			* Freescale PPC (I2S)
			* AMD/RMI/Alchemy Au1200/Au1550 (AC97, I2S)

	The following SoC CPUs are currently work in progress:		The following SoC CPUs are currently work in progress:

	* Marvell PXA3xx (I2S)
	* Freescale i.MX21 (I2S)		* Freescale i.MX21 (I2S)
	* Cirrus EP93xx (~~I2S)~~		* Cirrus EP93xx (I2S)
	* AMD/RMI/Alchemy Au1200/Au1550 (AC97, I2S)

	==Supported Codecs==		==Supported Codecs==

Broonie: /* Supported Codecs */ fix gitweb link properly; don't link to a specific revision in gitweb

2008-05-20T18:20:11Z

Supported Codecs: fix gitweb link properly; don't link to a specific revision in gitweb

← Older revision		Revision as of 18:20, 20 May 2008
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	==Supported Codecs==		==Supported Codecs==

	As the number of supported audio codecs is growing all the time, this [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc;a=tree;f=sound/soc/codecs~~;h=e862a0fc09f2477114e68ece6a52ea2e052dd315~~;hb=dev link] shows the supported codecs currently in the ASoC development branch.		As the number of supported audio codecs is growing all the time, this [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=tree;f=sound/soc/codecs;hb=dev link] shows the supported codecs currently in the ASoC development branch.

	==Development==		==Development==

Broonie: /* Development */ gitweb fix properly

2008-05-20T18:19:31Z

Development: gitweb fix properly

← Older revision		Revision as of 18:19, 20 May 2008
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	==Development==		==Development==

	ASoC development takes place in the dev branch of the [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc;a=summary ASoC git tree]. There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net.		ASoC development takes place in the dev branch of the [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=summary ASoC git tree]. There is also a [[ASoC/RoadMap]] and a developer IRC channel <tt>#alsa-soc</tt> on freenode.net.

	[[Category:Development]]		[[Category:Development]]
	[[Category:MigratedFromDev]]		[[Category:MigratedFromDev]]

Broonie: ' patrol

2008-05-20T18:18:55Z

' patrol

← Older revision		Revision as of 18:18, 20 May 2008
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	* Machine driver: The machine driver handles any machine specific controls and audio events. i.e. turing on an amp at start of playback.		* Machine driver: The machine driver handles any machine specific controls and audio events. i.e. turing on an amp at start of playback.

	==Supported ~~SoC's~~==		==Supported SoCs==

	The following SoC ~~CPU's~~ are currently supported:		The following SoC CPUs are currently supported:
	* Intel/Marvell PXA2xx (AC97, I2S & PCM)		* Intel/Marvell PXA2xx and PXA3xx (AC97, I2S & PCM)
	* Atmel AT91xxxx (I2S & PCM)		* Atmel AT91xxxx (I2S & PCM)
	* Samsung S3C24xx (AC97 & I2S)		* Samsung S3C24xx (AC97 & I2S)
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	* Renesas SH7760 (AC97 & I2S)		* Renesas SH7760 (AC97 & I2S)

	The following SoC ~~CPU's~~ are currently work in progress:		The following SoC CPUs are currently work in progress:

	* Marvell PXA3xx (~~AC97,~~ I2S~~, PCM~~)		* Marvell PXA3xx (I2S)
	* Freescale i.MX21 (I2S)		* Freescale i.MX21 (I2S)
	* Cirrus EP93xx (I2S)		* Cirrus EP93xx (I2S)
	* AMD/RMI/Alchemy Au1200/Au1550 (AC97, I2S)		* AMD/RMI/Alchemy Au1200/Au1550 (AC97, I2S)

	==Supported ~~Codec's~~==		==Supported Codecs==

	As the number of supported audio codecs is growing all the time, this [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc;a=tree;f=sound/soc/codecs;h=e862a0fc09f2477114e68ece6a52ea2e052dd315;hb=dev link] shows the supported codecs currently in the ASoC development branch.		As the number of supported audio codecs is growing all the time, this [http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc;a=tree;f=sound/soc/codecs;h=e862a0fc09f2477114e68ece6a52ea2e052dd315;hb=dev link] shows the supported codecs currently in the ASoC development branch.