ASoC: Initial WM8904 CODEC driver

The WM8904 is a high performance ultra-low power stereo CODEC
optimised for portable audio applications, with features including
a class W amplifier, FLL with free running mode, Mobile ReTune and
ground referenced headphone and line outputs.

Support for some features, most particularly the digital microphone
interface, is not yet present.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

include/sound/wm8904.h

+/*
+ * Platform data for WM8904
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_WM8994_PDATA_H__
+#define __MFD_WM8994_PDATA_H__
+
+#define WM8904_DRC_REGS 4
+#define WM8904_EQ_REGS  25
+
+/**
+ * DRC configurations are specified with a label and a set of register
+ * values to write (the enable bits will be ignored).  At runtime an
+ * enumerated control will be presented for each DRC block allowing
+ * the user to choose the configration to use.
+ *
+ * Configurations may be generated by hand or by using the DRC control
+ * panel provided by the WISCE - see  http://www.wolfsonmicro.com/wisce/
+ * for details.
+ */
+struct wm8904_drc_cfg {
+	const char *name;
+	u16 regs[WM8904_DRC_REGS];
+};
+
+/**
+ * ReTune Mobile configurations are specified with a label, sample
+ * rate and set of values to write (the enable bits will be ignored).
+ *
+ * Configurations are expected to be generated using the ReTune Mobile
+ * control panel in WISCE - see http://www.wolfsonmicro.com/wisce/
+ */
+struct wm8904_retune_mobile_cfg {
+	const char *name;
+	unsigned int rate;
+	u16 regs[WM8904_EQ_REGS];
+};
+
+struct wm8904_pdata {
+	int num_drc_cfgs;
+	struct wm8904_drc_cfg *drc_cfgs;
+
+	int num_retune_mobile_cfgs;
+	struct wm8904_retune_mobile_cfg *retune_mobile_cfgs;
+};
+
+#endif

sound/soc/codecs/Kconfig

@@ -49,6 +49,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_WM8776 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8900 if I2C
 	select SND_SOC_WM8903 if I2C
+	select SND_SOC_WM8904 if I2C
 	select SND_SOC_WM8940 if I2C
 	select SND_SOC_WM8960 if I2C
 	select SND_SOC_WM8961 if I2C
@@ -203,6 +204,9 @@ config SND_SOC_WM8900
 config SND_SOC_WM8903
 	tristate
 
+config SND_SOC_WM8904
+	tristate
+
 config SND_SOC_WM8940
         tristate
 

sound/soc/codecs/Makefile

@@ -36,6 +36,7 @@ snd-soc-wm8753-objs := wm8753.o
 snd-soc-wm8776-objs := wm8776.o
 snd-soc-wm8900-objs := wm8900.o
 snd-soc-wm8903-objs := wm8903.o
+snd-soc-wm8904-objs := wm8904.o
 snd-soc-wm8940-objs := wm8940.o
 snd-soc-wm8960-objs := wm8960.o
 snd-soc-wm8961-objs := wm8961.o
@@ -92,6 +93,7 @@ obj-$(CONFIG_SND_SOC_WM8753)	+= snd-soc-wm8753.o
 obj-$(CONFIG_SND_SOC_WM8776)	+= snd-soc-wm8776.o
 obj-$(CONFIG_SND_SOC_WM8900)	+= snd-soc-wm8900.o
 obj-$(CONFIG_SND_SOC_WM8903)	+= snd-soc-wm8903.o
+obj-$(CONFIG_SND_SOC_WM8904)	+= snd-soc-wm8904.o
 obj-$(CONFIG_SND_SOC_WM8971)	+= snd-soc-wm8971.o
 obj-$(CONFIG_SND_SOC_WM8974)	+= snd-soc-wm8974.o
 obj-$(CONFIG_SND_SOC_WM8940)	+= snd-soc-wm8940.o