linux-stable/sound
Janusz Krzysztofik 6d7f68a1ea ASoC: add support for Amstrad E3 (Delta) machine
This patch adds machine support for Amstrad E3 (Delta) videophone to ASoC.

Created and tested against linux-2.6.31-rc3.
Applies and works with linux-omap-2.6 commit
7c5cb7862d32cb344be7831d466535d5255e35ac as well.

Depends on:
1) latest version of the CX20442 codec driver that exposes v253_ops
   structure[1],
2) patch 2/3 form this series: TTY: Add definition of a new line
   discipline required by Amstrad E3 (Delta) ASoC driver[2].

CPU DAI parameters best matching the codec DAI has been selected out
empirically for best user experience.

Board specific audio function control (with related DAPM widgets) has been
modeled after empirically discovered codec capabilities.

Unlike other ASoC machine drivers, this one makes use of a codec provided line
discipline that is required for talking to a modem chip that can control the
codec behavoiur. As the line discipline operations must call board specific
bits as well, the machine driver registers its own line discipline ops, not
the codec provided, and then calls those codec provided from inside its own
callbacks.
If some kind of a glue, like a bus over a tty, exsited that could help in
runtime detection of a modem (bus adapter) over a more generic line discipline
(bus driver)[3], the line discipline code could be probably designed in a
more generic way.

In order to work at all, this driver requires a working McBSP1. On OMAP1510
based machines (not sure if other OMAP1 variants as well), where McBSP1 is a
DSP public peripheral, that means the kernel must provide basic DSP support,
ie. omap_dsp_init(), in order to power up the DSP. This used to be included in
linux-omap-2.6 tree up to commit 2512fd29db4eb09e82d182596304c7aaf76d2c5c.
Without that, the driver would not work, ie. not shift in/out any bits over
the CPU DAI[4]. This limitation is not board, but CPU specific, and may apply
to other code that makes use of McBSP1/McBSP3 on affected machines. I provide
an extra patch (4/3) as a temporary solution.

To work correctly in playback mode, this driver requires my prevoiusly
submitted patch that corrects pcm pointer calculation for OMAP1510 based
machines[5] (already included in linux-2.6.31-rc3).

To support codec controls, this driver requires my previously submitted patch
that adds support for modem found on Amstrad Delta[6].

[1] http://mailman.alsa-project.org/pipermail/alsa-devel/2009-July/019780.html
[2] http://www.spinics.net/lists/linux-serial/msg01862.html
[3] http://www.spinics.net/lists/linux-serial/msg01856.html
[4] http://www.spinics.net/lists/linux-omap/msg15114.html
[5] http://mailman.alsa-project.org/pipermail/alsa-devel/2009-June/018950.html
[6] http://www.spinics.net/lists/linux-omap/msg15432.html

Credits to:
Mark Underwood - for his initial, omap-alsa based sound driver for
this machine,
Mark Brown - for his help, patience and excellent subsytem maintainer support.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-07-31 22:38:44 +01:00
..
aoa sound: remove driver_data direct access of struct device 2009-05-12 09:20:54 +02:00
arm ASoC: Fix NULL pointer dereference in __pxa2xx_pcm_hw_free 2009-07-09 10:36:19 +01:00
atmel ALSA: snd-atmel-abdac: increase periods_min to 6 instead of 4 2009-04-06 03:56:28 +02:00
core Merge branch 'topic/seq-midi-fix' into for-linus 2009-06-22 17:03:56 +02:00
drivers time: move PIT_TICK_RATE to linux/timex.h 2009-06-16 19:47:27 -07:00
i2c V4L/DVB (10771): tea575x-tuner: convert it to V4L2 API 2009-03-30 12:43:02 -03:00
isa Merge branch 'topic/seq-kconfig-cleanup' into for-linus 2009-06-10 07:26:48 +02:00
mips ALSA: sgio2audio.c: clean up checking 2009-06-07 09:08:43 +02:00
oss time: move PIT_TICK_RATE to linux/timex.h 2009-06-16 19:47:27 -07:00
parisc Merge branch 'topic/section-fix' into for-linus 2009-06-10 07:26:46 +02:00
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 2009-06-23 10:45:39 -07:00
pcmcia ALSA: Add missing SNDRV_PCM_INFO_BATCH flag to some drivers 2009-04-28 15:06:44 +02:00
ppc Merge branch 'topic/ps3' into for-linus 2009-06-12 20:03:16 +02:00
sh trivial: Fix misspelling of firmware 2009-03-30 15:21:59 +02:00
soc ASoC: add support for Amstrad E3 (Delta) machine 2009-07-31 22:38:44 +01:00
sparc ALSA: Add missing SNDRV_PCM_INFO_BATCH flag to some drivers 2009-04-28 15:06:44 +02:00
spi
synth ALSA: clean up the logic for building sequencer modules 2009-05-29 11:49:42 +02:00
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 2009-06-21 13:13:08 -07:00
ac97_bus.c
Kconfig ALSA: Add Atmel ALSA drivers directory 2009-02-05 15:08:53 +01:00
last.c
Makefile ALSA: Add Atmel ALSA drivers directory 2009-02-05 15:08:53 +01:00
sound_core.c Driver Core: sound: add nodename for sound drivers 2009-06-15 21:30:26 -07:00
sound_firmware.c