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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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55
arch/sh/boards/mach-hp6xx/setup.c
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@@ -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)