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ALSA: sh: add SuperH DAC audio driver for ALSA V4

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This is a port of the sound/oss/sh_dac_audio.c driver.
The driver uses an on-chip 8-bit D/A converter, which has a speaker connected
to one of its channels, found in several ancient HP machines.
For interrupts it uses a high-resolution timer (hrtimer).
Tested on SH7709 based hp6xx (HP Jornada 680/690 and HP Palmtop 620lx/660lx).

Also, since OSS Emulation works, the old OSS sound/oss/sh_dac_audio.c driver
would be obsolete soon, and it could be removed.

Signed-off-by: Rafael Ignacio Zurita <rizurita@yahoo.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Rafael Ignacio Zurita
2009-11-03 17:16:27 -03:00
committed by Takashi Iwai
parent bcc2c6b7cb
commit 9dcaa7b25f
6 changed files with 543 additions and 0 deletions
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21
include/sound/sh_dac_audio.h Normal file
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/*
* SH_DAC specific configuration, for the dac_audio platform_device
*
* Copyright (C) 2009 Rafael Ignacio Zurita <rizurita@yahoo.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#ifndef __INCLUDE_SH_DAC_AUDIO_H
#define __INCLUDE_SH_DAC_AUDIO_H
struct dac_audio_pdata {
int buffer_size;
int channel;
void (*start)(struct dac_audio_pdata *pd);
void (*stop)(struct dac_audio_pdata *pd);
};
#endif /* __INCLUDE_SH_DAC_AUDIO_H */