This package includes:

* FTSSP010 I2S ASoC (ALSA Soc) audio driver
* prebuilt EABI alsa-lib and glibc shared libraries - usr.tgz and lib.tgz
* prebuilt EABI alsa-utils - alsa-utils.tgz

Usage:

(1) put the following code in your platform-dpendent initialization sequence.
------------------------>8-------------------------->8------------------------
static struct resource ftssp010_0_i2s_resources[] = {
	{
		.start	= A369_FTSSP010_0_PA_BASE,
		.end	= A369_FTSSP010_0_PA_BASE + SZ_4K - 1,
		.flags	= IORESOURCE_MEM,
	}, {
		.start	= IRQ_A369_FTSSP010_0,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct platform_device ftssp010_0_i2s_device = {
	.name	= "ftssp010-i2s",
	.id	= 0,
	.num_resources	= ARRAY_SIZE(ftssp010_0_i2s_resources),
	.resource	= ftssp010_0_i2s_resources,
};

static struct i2c_board_info __initdata a369_i2c_devices[] = {
	{ I2C_BOARD_INFO("wm8731", 0x1b), },
};

i2c_register_board_info(0, a369_i2c_devices, ARRAY_SIZE(a369_i2c_devices));
platform_device_register(&ftssp010_0_i2s_device);
------------------------>8-------------------------->8------------------------


(2) apply the following patch to sound/soc/codecs/wm8731.c
------------------------>8-------------------------->8------------------------
diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 0ab9b63..5900c21 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -401,7 +401,21 @@ static int wm8731_set_bias_level(struct snd_soc_codec *codec,

                /* Clear PWROFF, gate CLKOUT, everything else as-is */
                reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
+#ifdef CONFIG_ARCH_FARADAY
+               /*
+                * Make sure that CLKOUT of wm8731 will not be powered down.
+                *
+                * We choose external clock source (X_SSP_CLK) as SSP0 clock
+                * input by setting bit 4 of SCLK_CFG1 register of SCU010.
+                * The external clock source (X_SSP_CLK) comes from CLKOUT of
+                * wm8731 on A369 evb. The wm8731 codec driver in Linux gates
+                * CLKOUT by default. We need to apply this patch or there will
+                * be no external clock.
+                */
+               snd_soc_write(codec, WM8731_PWR, reg);
+#else
                snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
+#endif
                break;
        case SND_SOC_BIAS_OFF:
                snd_soc_write(codec, WM8731_ACTIVE, 0x0);
------------------------>8-------------------------->8------------------------
This patch makes sure that CLKOUT of wm8731 will not be powered down.

We choose external clock source (X_SSP_CLK) as SSP0 clock input by setting
bit 4 of SCLK_CFG1 register of SCU010. The external clock source (X_SSP_CLK)
comes from CLKOUT of wm8731 on A369 evb. The wm8731 codec driver in Linux gates
CLKOUT by default. We need to apply this patch or there will be no external
clock.


(3) make sure the following config options are set and then compile kernel

CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_SOC=y
CONFIG_SND_SOC_WM8731=y


(4) install shared libraries needed by alsa-utils

decompress lib.tgz and usr.tgz into rootfs


(5) create device files

(5.a) if you built FTSSP010 audio driver as modules

$ mkdir /dev/snd
$ mknod /dev/snd/controlC0 c 116 0
$ mknod /dev/snd/pcmC0D0p c 116 16
$ mknod /dev/snd/pcmC0D0c c 116 24
$ mknod /dev/snd/timer c 116 33

(5.b) if you built FTSSP010 audio drvier into kernel

The device files will be created automatically, but may be in wrong path.
You might need to create symbolic links manually.

$ mkdir /dev/snd
$ ln -s /dev/controlC0 /dev/snd/controlC0
$ ln -s /dev/pcmC0D0p /dev/snd/pcmC0D0p
$ ln -s /dev/pcmC0D0c /dev/snd/pcmC0D0c
$ ln -s /dev/timer /dev/snd/timer


(6) turn on <HiFi Playback Switch> and <Line Capture Switch>

The wm8731 codec driver by default turns off the <HiFi Playback Switch> which
connects <DAC> and <Output Mixer>. We should turn it on before playing audio,
or there will be no sound.

<Line Capture Switch> is also turned off by default. It connects <Line Input>
and <Input Mux>. We should turn it on before recording.

(6.a) get current configuration

$ alsactl store

File /etc/asound.state will be created.

(6.b) modify /etc/asound.state

------------------------>8-------------------------->8------------------------
	control.4 {
		comment.access 'read write'
		comment.type BOOLEAN
		comment.count 2
		iface MIXER
		name 'Line Capture Switch'
-		value.0 false
-		value.1 false
+		value.0 true
+		value.1 true
	}
------------------------>8-------------------------->8------------------------
------------------------>8-------------------------->8------------------------
	control.14 {
		comment.access 'read write'
		comment.type BOOLEAN
		comment.count 1
		iface MIXER
		name 'Output Mixer HiFi Playback Swit'
-		value false
+		value true
	}
------------------------>8-------------------------->8------------------------

(6.c) apply the new configuration.

$ alsactl restore

(7) use aplay and arecord

$ arecord -d 60 -r 96000 -f s16 -c 2 /test.wav
$ aplay /test.wav

use -h option for help


******************************************************************************
How to build alsa-lib and alsa-utils:

(1) build ncurses-5.7 library for alsa-mixer

$ tar -xvzf ncurses-5.7.tar.gz
$ cd ncurses-5.7
$ make

	* install ncurses library to /tmp for compiling alsa-utils

$ make install.libs DESTDIR=/tmp


(2) build alsa-lib (ALSA user space library)

$ tar -xvjf alsa-lib-1.0.22.tar.bz2
$ cd alsa-lib-1.0.22
$ ./configure --host=arm-none-linux-gnueabi --disable-python
$ make

	* install alsa-lib to /tmp for compiling alsa-utils

$ make install DESTDIR=/tmp

	* install alsa-lib to rootfs for runtime use

$ make install DESTDIR=/home/ratbert/linux/FA5A320LINUX26_RAMDISK/rootfs


(3) build alsa-utils (ALSA utility)

$ tar -xvjf alsa-utils-1.0.22.tar.bz2
$ cd alsa-utils-1.0.22

	* tell configure script where alsa-lib is

$ ./configure --host=arm-none-linux-gnueabi --disable-xmlto --with-alsa-inc-prefix=/tmp/usr/include --with-alsa-prefix=/tmp/usr/lib

	* some hacking:
		* modify alsamixer/Makefile to specify the include and library search path to where libncurses is
		* this is dirty, but I did not find more elegant way

------------------------>8-------------------------->8------------------------
-CURSES_CFLAGS = -I/usr/include/ncurses
+CURSES_CFLAGS = -I/tmp/usr/include/ncurses

-AM_CFLAGS = -I/usr/include/ncurses -DCURSESINC="<ncurses.h>"
+AM_CFLAGS = -I/tmp/usr/include/ncurses -DCURSESINC="<ncurses.h>"
------------------------>8-------------------------->8------------------------

$ make

	* install to where you prefer

$ make install DESTDIR=/home/ratbert/linux/alsa-utils