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>

1 files changed, 4 insertions, 0 deletions

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)