Commit 9dcaa7b2 authored by Rafael Ignacio Zurita's avatar Rafael Ignacio Zurita Committed by Takashi Iwai
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ALSA: sh: add SuperH DAC audio driver for ALSA V4 



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: default avatarRafael Ignacio Zurita <rizurita@yahoo.com>
Acked-by: default avatarPaul Mundt <lethal@linux-sh.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent bcc2c6b7

arch/sh/boards/mach-hp6xx/setup.c

+55 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/irq.h>

#include <sound/sh_dac_audio.h>

#include <asm/hd64461.h>

#include <asm/io.h>

#include <mach/hp6xx.h>
@@ -51,9 +52,63 @@ static struct platform_device jornadakbd_device = { 
	.id		= -1,

};



static void dac_audio_start(struct dac_audio_pdata *pdata)

{

	u16 v;

	u8 v8;



	/* HP Jornada 680/690 speaker on */

	v = inw(HD64461_GPADR);

	v &= ~HD64461_GPADR_SPEAKER;

	outw(v, HD64461_GPADR);



	/* HP Palmtop 620lx/660lx speaker on */

	v8 = inb(PKDR);

	v8 &= ~PKDR_SPEAKER;

	outb(v8, PKDR);



	sh_dac_enable(pdata->channel);

}



static void dac_audio_stop(struct dac_audio_pdata *pdata)

{

	u16 v;

	u8 v8;



	/* HP Jornada 680/690 speaker off */

	v = inw(HD64461_GPADR);

	v |= HD64461_GPADR_SPEAKER;

	outw(v, HD64461_GPADR);



	/* HP Palmtop 620lx/660lx speaker off */

	v8 = inb(PKDR);

	v8 |= PKDR_SPEAKER;

	outb(v8, PKDR);



	sh_dac_output(0, pdata->channel);

	sh_dac_disable(pdata->channel);

}



static struct dac_audio_pdata dac_audio_platform_data = {

	.buffer_size		= 64000,

	.channel		= 1,

	.start			= dac_audio_start,

	.stop			= dac_audio_stop,

};



static struct platform_device dac_audio_device = {

	.name		= "dac_audio",

	.id		= -1,

	.dev		= {

		.platform_data	= &dac_audio_platform_data,

	}



};



static struct platform_device *hp6xx_devices[] __initdata = {

	&cf_ide_device,

	&jornadakbd_device,

	&dac_audio_device,

};



static void __init hp6xx_init_irq(void)

arch/sh/include/mach-common/mach/hp6xx.h

+4 −0
Original line number Diff line number Diff line
@@ -29,6 +29,9 @@ 


#define PKDR_LED_GREEN		0x10



/* HP Palmtop 620lx/660lx speaker on/off */

#define PKDR_SPEAKER		0x20



#define SCPDR_TS_SCAN_ENABLE	0x20

#define SCPDR_TS_SCAN_Y		0x02

#define SCPDR_TS_SCAN_X		0x01
@@ -42,6 +45,7 @@ 
#define ADC_CHANNEL_BACKUP	4

#define ADC_CHANNEL_CHARGE	5



/* HP Jornada 680/690 speaker on/off */

#define HD64461_GPADR_SPEAKER	0x01

#define HD64461_GPADR_PCMCIA0	(0x02|0x08)

include/sound/sh_dac_audio.h

0 → 100644
+21 −0
Original line number Diff line number Diff line 
/*

 * 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 */

sound/sh/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -19,5 +19,13 @@ config SND_AICA 
	help

	  ALSA Sound driver for the SEGA Dreamcast console.



config SND_SH_DAC_AUDIO

	tristate "SuperH DAC audio support"

	depends on SND

	depends on CPU_SH3 && HIGH_RES_TIMERS

	select SND_PCM

	help

	  Say Y here to include support for the on-chip DAC.



endif	# SND_SUPERH

sound/sh/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -3,6 +3,8 @@ 
#



snd-aica-objs := aica.o

snd-sh_dac_audio-objs := sh_dac_audio.o



# Toplevel Module Dependency

obj-$(CONFIG_SND_AICA) += snd-aica.o

obj-$(CONFIG_SND_SH_DAC_AUDIO) += snd-sh_dac_audio.o

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