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>

2 files changed, 59 insertions, 0 deletions

diff --git a/arch/sh/boards/mach-hp6xx/setup.c b/arch/sh/boards/mach-hp6xx/setup.c
index 8f305b36358b..e6dd5e96321e 100644
--- a/arch/sh/boards/mach-hp6xx/setup.c
+++ b/arch/sh/boards/mach-hp6xx/setup.c
@@ -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)
diff --git a/arch/sh/include/mach-common/mach/hp6xx.h b/arch/sh/include/mach-common/mach/hp6xx.h
index 0d4165a32dcd..bcc301ac12f4 100644
--- a/arch/sh/include/mach-common/mach/hp6xx.h
+++ b/arch/sh/include/mach-common/mach/hp6xx.h
@@ -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)