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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: Rafael Ignacio Zurita <rizurita@yahoo.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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1 parent bcc2c6b commit 9dcaa7b25f2c8f6a0485854cd3641f585a154072 Rafael Ignacio Zurita committed with tiwai Nov 3, 2009
@@ -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)
@@ -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)
@@ -0,0 +1,21 @@
+/*
+ * 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 */
View
@@ -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
View
@@ -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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