ASoC: Add WM9090 amplifier driver

The WM9090 is a high performance low power audio subsystem, including
headphone and class D speaker drivers.

Note that this driver is a standalone CODEC driver and so is only
immediately suitable for use with the WM9090 as a standalone sound card
taking line inputs, or with a DAC with no software control.  The pending
ASoC multi-CODEC support will expand the range of systems that can use
the driver, or system-specific adaptations can be made.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 773 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm9090.c b/sound/soc/codecs/wm9090.c
new file mode 100644
index 00000000000..1592250daec
--- /dev/null
+++ b/sound/soc/codecs/wm9090.c
@@ -0,0 +1,773 @@
+/*
+ * ALSA SoC WM9090 driver
+ *
+ * Copyright 2009, 2010 Wolfson Microelectronics
+ *
+ * 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
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/tlv.h>
+#include <sound/wm9090.h>
+
+#include "wm9090.h"
+
+static struct snd_soc_codec *wm9090_codec;
+
+static const u16 wm9090_reg_defaults[] = {
+	0x9093,     /* R0   - Software Reset */
+	0x0006,     /* R1   - Power Management (1) */
+	0x6000,     /* R2   - Power Management (2) */
+	0x0000,     /* R3   - Power Management (3) */
+	0x0000,     /* R4 */
+	0x0000,     /* R5 */
+	0x01C0,     /* R6   - Clocking 1 */
+	0x0000,     /* R7 */
+	0x0000,     /* R8 */
+	0x0000,     /* R9 */
+	0x0000,     /* R10 */
+	0x0000,     /* R11 */
+	0x0000,     /* R12 */
+	0x0000,     /* R13 */
+	0x0000,     /* R14 */
+	0x0000,     /* R15 */
+	0x0000,     /* R16 */
+	0x0000,     /* R17 */
+	0x0000,     /* R18 */
+	0x0000,     /* R19 */
+	0x0000,     /* R20 */
+	0x0000,     /* R21 */
+	0x0003,     /* R22  - IN1 Line Control */
+	0x0003,     /* R23  - IN2 Line Control */
+	0x0083,     /* R24  - IN1 Line Input A Volume */
+	0x0083,     /* R25  - IN1  Line Input B Volume */
+	0x0083,     /* R26  - IN2 Line Input A Volume */
+	0x0083,     /* R27  - IN2 Line Input B Volume */
+	0x002D,     /* R28  - Left Output Volume */
+	0x002D,     /* R29  - Right Output Volume */
+	0x0000,     /* R30 */
+	0x0000,     /* R31 */
+	0x0000,     /* R32 */
+	0x0000,     /* R33 */
+	0x0100,     /* R34  - SPKMIXL Attenuation */
+	0x0000,     /* R35 */
+	0x0010,     /* R36  - SPKOUT Mixers */
+	0x0140,     /* R37  - ClassD3 */
+	0x0039,     /* R38  - Speaker Volume Left */
+	0x0000,     /* R39 */
+	0x0000,     /* R40 */
+	0x0000,     /* R41 */
+	0x0000,     /* R42 */
+	0x0000,     /* R43 */
+	0x0000,     /* R44 */
+	0x0000,     /* R45  - Output Mixer1 */
+	0x0000,     /* R46  - Output Mixer2 */
+	0x0100,     /* R47  - Output Mixer3 */
+	0x0100,     /* R48  - Output Mixer4 */
+	0x0000,     /* R49 */
+	0x0000,     /* R50 */
+	0x0000,     /* R51 */
+	0x0000,     /* R52 */
+	0x0000,     /* R53 */
+	0x0000,     /* R54  - Speaker Mixer */
+	0x0000,     /* R55 */
+	0x0000,     /* R56 */
+	0x000D,     /* R57  - AntiPOP2 */
+	0x0000,     /* R58 */
+	0x0000,     /* R59 */
+	0x0000,     /* R60 */
+	0x0000,     /* R61 */
+	0x0000,     /* R62 */
+	0x0000,     /* R63 */
+	0x0000,     /* R64 */
+	0x0000,     /* R65 */
+	0x0000,     /* R66 */
+	0x0000,     /* R67 */
+	0x0000,     /* R68 */
+	0x0000,     /* R69 */
+	0x0000,     /* R70  - Write Sequencer 0 */
+	0x0000,     /* R71  - Write Sequencer 1 */
+	0x0000,     /* R72  - Write Sequencer 2 */
+	0x0000,     /* R73  - Write Sequencer 3 */
+	0x0000,     /* R74  - Write Sequencer 4 */
+	0x0000,     /* R75  - Write Sequencer 5 */
+	0x1F25,     /* R76  - Charge Pump 1 */
+	0x0000,     /* R77 */
+	0x0000,     /* R78 */
+	0x0000,     /* R79 */
+	0x0000,     /* R80 */
+	0x0000,     /* R81 */
+	0x0000,     /* R82 */
+	0x0000,     /* R83 */
+	0x0000,     /* R84  - DC Servo 0 */
+	0x054A,     /* R85  - DC Servo 1 */
+	0x0000,     /* R86 */
+	0x0000,     /* R87  - DC Servo 3 */
+	0x0000,     /* R88  - DC Servo Readback 0 */
+	0x0000,     /* R89  - DC Servo Readback 1 */
+	0x0000,     /* R90  - DC Servo Readback 2 */
+	0x0000,     /* R91 */
+	0x0000,     /* R92 */
+	0x0000,     /* R93 */
+	0x0000,     /* R94 */
+	0x0000,     /* R95 */
+	0x0100,     /* R96  - Analogue HP 0 */
+	0x0000,     /* R97 */
+	0x8640,     /* R98  - AGC Control 0 */
+	0xC000,     /* R99  - AGC Control 1 */
+	0x0200,     /* R100 - AGC Control 2 */
+};
+
+/* This struct is used to save the context */
+struct wm9090_priv {
+	/* We're not really registering as a CODEC since ASoC core
+	 * does not yet support multiple CODECs but having the CODEC
+	 * structure means we can reuse some of the ASoC core
+	 * features.
+	 */
+	struct snd_soc_codec codec;
+	struct mutex mutex;
+	u16 reg_cache[WM9090_MAX_REGISTER + 1];
+	struct wm9090_platform_data pdata;
+};
+
+static int wm9090_volatile(unsigned int reg)
+{
+	switch (reg) {
+	case WM9090_SOFTWARE_RESET:
+	case WM9090_DC_SERVO_0:
+	case WM9090_DC_SERVO_READBACK_0:
+	case WM9090_DC_SERVO_READBACK_1:
+	case WM9090_DC_SERVO_READBACK_2:
+		return 1;
+
+	default:
+		return 0;
+	}
+}
+
+static void wait_for_dc_servo(struct snd_soc_codec *codec)
+{
+	unsigned int reg;
+	int count = 0;
+
+	dev_dbg(codec->dev, "Waiting for DC servo...\n");
+	do {
+		count++;
+		msleep(1);
+		reg = snd_soc_read(codec, WM9090_DC_SERVO_READBACK_0);
+		dev_dbg(codec->dev, "DC servo status: %x\n", reg);
+	} while ((reg & WM9090_DCS_CAL_COMPLETE_MASK)
+		 != WM9090_DCS_CAL_COMPLETE_MASK && count < 1000);
+
+	if ((reg & WM9090_DCS_CAL_COMPLETE_MASK)
+	    != WM9090_DCS_CAL_COMPLETE_MASK)
+		dev_err(codec->dev, "Timed out waiting for DC Servo\n");
+}
+
+static const unsigned int in_tlv[] = {
+	TLV_DB_RANGE_HEAD(6),
+	0, 0, TLV_DB_SCALE_ITEM(-600, 0, 0),
+	1, 3, TLV_DB_SCALE_ITEM(-350, 350, 0),
+	4, 6, TLV_DB_SCALE_ITEM(600, 600, 0),
+};
+static const unsigned int mix_tlv[] = {
+	TLV_DB_RANGE_HEAD(4),
+	0, 2, TLV_DB_SCALE_ITEM(-1200, 300, 0),
+	3, 3, TLV_DB_SCALE_ITEM(0, 0, 0),
+};
+static const DECLARE_TLV_DB_SCALE(out_tlv, -5700, 100, 0);
+static const unsigned int spkboost_tlv[] = {
+	TLV_DB_RANGE_HEAD(7),
+	0, 6, TLV_DB_SCALE_ITEM(0, 150, 0),
+	7, 7, TLV_DB_SCALE_ITEM(1200, 0, 0),
+};
+
+static const struct snd_kcontrol_new wm9090_controls[] = {
+SOC_SINGLE_TLV("IN1A Volume", WM9090_IN1_LINE_INPUT_A_VOLUME, 0, 6, 0,
+	       in_tlv),
+SOC_SINGLE("IN1A Switch", WM9090_IN1_LINE_INPUT_A_VOLUME, 7, 1, 1),
+SOC_SINGLE("IN1A ZC Switch", WM9090_IN1_LINE_INPUT_A_VOLUME, 6, 1, 0),
+
+SOC_SINGLE_TLV("IN2A Volume", WM9090_IN2_LINE_INPUT_A_VOLUME, 0, 6, 0,
+	       in_tlv),
+SOC_SINGLE("IN2A Switch", WM9090_IN2_LINE_INPUT_A_VOLUME, 7, 1, 1),
+SOC_SINGLE("IN2A ZC Switch", WM9090_IN2_LINE_INPUT_A_VOLUME, 6, 1, 0),
+
+SOC_SINGLE("MIXOUTL Switch", WM9090_OUTPUT_MIXER3, 8, 1, 1),
+SOC_SINGLE_TLV("MIXOUTL IN1A Volume", WM9090_OUTPUT_MIXER3, 6, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTL IN2A Volume", WM9090_OUTPUT_MIXER3, 2, 3, 1,
+	       mix_tlv),
+
+SOC_SINGLE("MIXOUTR Switch", WM9090_OUTPUT_MIXER4, 8, 1, 1),
+SOC_SINGLE_TLV("MIXOUTR IN1A Volume", WM9090_OUTPUT_MIXER4, 6, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTR IN2A Volume", WM9090_OUTPUT_MIXER4, 2, 3, 1,
+	       mix_tlv),
+
+SOC_SINGLE("SPKMIX Switch", WM9090_SPKMIXL_ATTENUATION, 8, 1, 1),
+SOC_SINGLE_TLV("SPKMIX IN1A Volume", WM9090_SPKMIXL_ATTENUATION, 6, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("SPKMIX IN2A Volume", WM9090_SPKMIXL_ATTENUATION, 2, 3, 1,
+	       mix_tlv),
+
+SOC_DOUBLE_R_TLV("Headphone Volume", WM9090_LEFT_OUTPUT_VOLUME,
+		 WM9090_RIGHT_OUTPUT_VOLUME, 0, 63, 0, out_tlv),
+SOC_DOUBLE_R("Headphone Switch", WM9090_LEFT_OUTPUT_VOLUME,
+	     WM9090_RIGHT_OUTPUT_VOLUME, 6, 1, 1),
+SOC_DOUBLE_R("Headphone ZC Switch", WM9090_LEFT_OUTPUT_VOLUME,
+	     WM9090_RIGHT_OUTPUT_VOLUME, 7, 1, 0),
+
+SOC_SINGLE_TLV("Speaker Volume", WM9090_SPEAKER_VOLUME_LEFT, 0, 63, 0,
+	       out_tlv),
+SOC_SINGLE("Speaker Switch", WM9090_SPEAKER_VOLUME_LEFT, 6, 1, 1),
+SOC_SINGLE("Speaker ZC Switch", WM9090_SPEAKER_VOLUME_LEFT, 7, 1, 0),
+SOC_SINGLE_TLV("Speaker Boost Volume", WM9090_CLASSD3, 3, 7, 0, spkboost_tlv),
+};
+
+static const struct snd_kcontrol_new wm9090_in1_se_controls[] = {
+SOC_SINGLE_TLV("IN1B Volume", WM9090_IN1_LINE_INPUT_B_VOLUME, 0, 6, 0,
+	       in_tlv),
+SOC_SINGLE("IN1B Switch", WM9090_IN1_LINE_INPUT_B_VOLUME, 7, 1, 1),
+SOC_SINGLE("IN1B ZC Switch", WM9090_IN1_LINE_INPUT_B_VOLUME, 6, 1, 0),
+
+SOC_SINGLE_TLV("SPKMIX IN1B Volume", WM9090_SPKMIXL_ATTENUATION, 4, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTL IN1B Volume", WM9090_OUTPUT_MIXER3, 4, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTR IN1B Volume", WM9090_OUTPUT_MIXER4, 4, 3, 1,
+	       mix_tlv),
+};
+
+static const struct snd_kcontrol_new wm9090_in2_se_controls[] = {
+SOC_SINGLE_TLV("IN2B Volume", WM9090_IN2_LINE_INPUT_B_VOLUME, 0, 6, 0,
+	       in_tlv),
+SOC_SINGLE("IN2B Switch", WM9090_IN2_LINE_INPUT_B_VOLUME, 7, 1, 1),
+SOC_SINGLE("IN2B ZC Switch", WM9090_IN2_LINE_INPUT_B_VOLUME, 6, 1, 0),
+
+SOC_SINGLE_TLV("SPKMIX IN2B Volume", WM9090_SPKMIXL_ATTENUATION, 0, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTL IN2B Volume", WM9090_OUTPUT_MIXER3, 0, 3, 1,
+	       mix_tlv),
+SOC_SINGLE_TLV("MIXOUTR IN2B Volume", WM9090_OUTPUT_MIXER4, 0, 3, 1,
+	       mix_tlv),
+};
+
+static int hp_ev(struct snd_soc_dapm_widget *w,
+		 struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_codec *codec = w->codec;
+	unsigned int reg = snd_soc_read(codec, WM9090_ANALOGUE_HP_0);
+
+	switch (event) {
+	case SND_SOC_DAPM_POST_PMU:
+		snd_soc_update_bits(codec, WM9090_CHARGE_PUMP_1,
+				    WM9090_CP_ENA, WM9090_CP_ENA);
+
+		msleep(5);
+
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_1,
+				    WM9090_HPOUT1L_ENA | WM9090_HPOUT1R_ENA,
+				    WM9090_HPOUT1L_ENA | WM9090_HPOUT1R_ENA);
+
+		reg |= WM9090_HPOUT1L_DLY | WM9090_HPOUT1R_DLY;
+		snd_soc_write(codec, WM9090_ANALOGUE_HP_0, reg);
+
+		/* Start the DC servo.  We don't currently use the
+		 * ability to save the state since we don't have full
+		 * control of the analogue paths and they can change
+		 * DC offsets; see the WM8904 driver for an example of
+		 * doing so.
+		 */
+		snd_soc_write(codec, WM9090_DC_SERVO_0,
+			      WM9090_DCS_ENA_CHAN_0 |
+			      WM9090_DCS_ENA_CHAN_1 |
+			      WM9090_DCS_TRIG_STARTUP_1 |
+			      WM9090_DCS_TRIG_STARTUP_0);
+		wait_for_dc_servo(codec);
+
+		reg |= WM9090_HPOUT1R_OUTP | WM9090_HPOUT1R_RMV_SHORT |
+			WM9090_HPOUT1L_OUTP | WM9090_HPOUT1L_RMV_SHORT;
+		snd_soc_write(codec, WM9090_ANALOGUE_HP_0, reg);
+		break;
+
+	case SND_SOC_DAPM_PRE_PMD:
+		reg &= ~(WM9090_HPOUT1L_RMV_SHORT |
+			 WM9090_HPOUT1L_DLY |
+			 WM9090_HPOUT1L_OUTP |
+			 WM9090_HPOUT1R_RMV_SHORT |
+			 WM9090_HPOUT1R_DLY |
+			 WM9090_HPOUT1R_OUTP);
+
+		snd_soc_write(codec, WM9090_ANALOGUE_HP_0, reg);
+
+		snd_soc_write(codec, WM9090_DC_SERVO_0, 0);
+
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_1,
+				    WM9090_HPOUT1L_ENA | WM9090_HPOUT1R_ENA,
+				    0);
+
+		snd_soc_update_bits(codec, WM9090_CHARGE_PUMP_1,
+				    WM9090_CP_ENA, 0);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct snd_kcontrol_new spkmix[] = {
+SOC_DAPM_SINGLE("IN1A Switch", WM9090_SPEAKER_MIXER, 6, 1, 0),
+SOC_DAPM_SINGLE("IN1B Switch", WM9090_SPEAKER_MIXER, 4, 1, 0),
+SOC_DAPM_SINGLE("IN2A Switch", WM9090_SPEAKER_MIXER, 2, 1, 0),
+SOC_DAPM_SINGLE("IN2B Switch", WM9090_SPEAKER_MIXER, 0, 1, 0),
+};
+
+static const struct snd_kcontrol_new spkout[] = {
+SOC_DAPM_SINGLE("Mixer Switch", WM9090_SPKOUT_MIXERS, 4, 1, 0),
+};
+
+static const struct snd_kcontrol_new mixoutl[] = {
+SOC_DAPM_SINGLE("IN1A Switch", WM9090_OUTPUT_MIXER1, 6, 1, 0),
+SOC_DAPM_SINGLE("IN1B Switch", WM9090_OUTPUT_MIXER1, 4, 1, 0),
+SOC_DAPM_SINGLE("IN2A Switch", WM9090_OUTPUT_MIXER1, 2, 1, 0),
+SOC_DAPM_SINGLE("IN2B Switch", WM9090_OUTPUT_MIXER1, 0, 1, 0),
+};
+
+static const struct snd_kcontrol_new mixoutr[] = {
+SOC_DAPM_SINGLE("IN1A Switch", WM9090_OUTPUT_MIXER2, 6, 1, 0),
+SOC_DAPM_SINGLE("IN1B Switch", WM9090_OUTPUT_MIXER2, 4, 1, 0),
+SOC_DAPM_SINGLE("IN2A Switch", WM9090_OUTPUT_MIXER2, 2, 1, 0),
+SOC_DAPM_SINGLE("IN2B Switch", WM9090_OUTPUT_MIXER2, 0, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget wm9090_dapm_widgets[] = {
+SND_SOC_DAPM_INPUT("IN1+"),
+SND_SOC_DAPM_INPUT("IN1-"),
+SND_SOC_DAPM_INPUT("IN2+"),
+SND_SOC_DAPM_INPUT("IN2-"),
+
+SND_SOC_DAPM_SUPPLY("OSC", WM9090_POWER_MANAGEMENT_1, 3, 0, NULL, 0),
+
+SND_SOC_DAPM_PGA("IN1A PGA", WM9090_POWER_MANAGEMENT_2, 7, 0, NULL, 0),
+SND_SOC_DAPM_PGA("IN1B PGA", WM9090_POWER_MANAGEMENT_2, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("IN2A PGA", WM9090_POWER_MANAGEMENT_2, 5, 0, NULL, 0),
+SND_SOC_DAPM_PGA("IN2B PGA", WM9090_POWER_MANAGEMENT_2, 4, 0, NULL, 0),
+
+SND_SOC_DAPM_MIXER("SPKMIX", WM9090_POWER_MANAGEMENT_3, 3, 0,
+		   spkmix, ARRAY_SIZE(spkmix)),
+SND_SOC_DAPM_MIXER("MIXOUTL", WM9090_POWER_MANAGEMENT_3, 5, 0,
+		   mixoutl, ARRAY_SIZE(mixoutl)),
+SND_SOC_DAPM_MIXER("MIXOUTR", WM9090_POWER_MANAGEMENT_3, 4, 0,
+		   mixoutr, ARRAY_SIZE(mixoutr)),
+
+SND_SOC_DAPM_PGA_E("HP PGA", SND_SOC_NOPM, 0, 0, NULL, 0,
+		   hp_ev, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+
+SND_SOC_DAPM_PGA("SPKPGA", WM9090_POWER_MANAGEMENT_3, 8, 0, NULL, 0),
+SND_SOC_DAPM_MIXER("SPKOUT", WM9090_POWER_MANAGEMENT_1, 12, 0,
+		   spkout, ARRAY_SIZE(spkout)),
+
+SND_SOC_DAPM_OUTPUT("HPR"),
+SND_SOC_DAPM_OUTPUT("HPL"),
+SND_SOC_DAPM_OUTPUT("Speaker"),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+	{ "IN1A PGA", NULL, "IN1+" },
+	{ "IN2A PGA", NULL, "IN2+" },
+
+	{ "SPKMIX", "IN1A Switch", "IN1A PGA" },
+	{ "SPKMIX", "IN2A Switch", "IN2A PGA" },
+
+	{ "MIXOUTL", "IN1A Switch", "IN1A PGA" },
+	{ "MIXOUTL", "IN2A Switch", "IN2A PGA" },
+
+	{ "MIXOUTR", "IN1A Switch", "IN1A PGA" },
+	{ "MIXOUTR", "IN2A Switch", "IN2A PGA" },
+
+	{ "HP PGA", NULL, "OSC" },
+	{ "HP PGA", NULL, "MIXOUTL" },
+	{ "HP PGA", NULL, "MIXOUTR" },
+
+	{ "HPL", NULL, "HP PGA" },
+	{ "HPR", NULL, "HP PGA" },
+
+	{ "SPKPGA", NULL, "OSC" },
+	{ "SPKPGA", NULL, "SPKMIX" },
+
+	{ "SPKOUT", "Mixer Switch", "SPKPGA" },
+
+	{ "Speaker", NULL, "SPKOUT" },
+};
+
+static const struct snd_soc_dapm_route audio_map_in1_se[] = {
+	{ "IN1B PGA", NULL, "IN1-" },	
+
+	{ "SPKMIX", "IN1B Switch", "IN1B PGA" },
+	{ "MIXOUTL", "IN1B Switch", "IN1B PGA" },
+	{ "MIXOUTR", "IN1B Switch", "IN1B PGA" },
+};
+
+static const struct snd_soc_dapm_route audio_map_in1_diff[] = {
+	{ "IN1A PGA", NULL, "IN1-" },	
+};
+
+static const struct snd_soc_dapm_route audio_map_in2_se[] = {
+	{ "IN2B PGA", NULL, "IN2-" },	
+
+	{ "SPKMIX", "IN2B Switch", "IN2B PGA" },
+	{ "MIXOUTL", "IN2B Switch", "IN2B PGA" },
+	{ "MIXOUTR", "IN2B Switch", "IN2B PGA" },
+};
+
+static const struct snd_soc_dapm_route audio_map_in2_diff[] = {
+	{ "IN2A PGA", NULL, "IN2-" },	
+};
+
+static int wm9090_add_controls(struct snd_soc_codec *codec)
+{
+	struct wm9090_priv *wm9090 = snd_soc_codec_get_drvdata(codec);
+	int i;
+
+	snd_soc_dapm_new_controls(codec, wm9090_dapm_widgets,
+				  ARRAY_SIZE(wm9090_dapm_widgets));
+
+	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+	snd_soc_add_controls(codec, wm9090_controls,
+			     ARRAY_SIZE(wm9090_controls));
+
+	if (wm9090->pdata.lin1_diff) {
+		snd_soc_dapm_add_routes(codec, audio_map_in1_diff,
+					ARRAY_SIZE(audio_map_in1_diff));
+	} else {
+		snd_soc_dapm_add_routes(codec, audio_map_in1_se,
+					ARRAY_SIZE(audio_map_in1_se));
+		snd_soc_add_controls(codec, wm9090_in1_se_controls,
+				     ARRAY_SIZE(wm9090_in1_se_controls));
+	}
+
+	if (wm9090->pdata.lin2_diff) {
+		snd_soc_dapm_add_routes(codec, audio_map_in2_diff,
+					ARRAY_SIZE(audio_map_in2_diff));
+	} else {
+		snd_soc_dapm_add_routes(codec, audio_map_in2_se,
+					ARRAY_SIZE(audio_map_in2_se));
+		snd_soc_add_controls(codec, wm9090_in2_se_controls,
+				     ARRAY_SIZE(wm9090_in2_se_controls));
+	}
+
+	if (wm9090->pdata.agc_ena) {
+		for (i = 0; i < ARRAY_SIZE(wm9090->pdata.agc); i++)
+			snd_soc_write(codec, WM9090_AGC_CONTROL_0 + i,
+				      wm9090->pdata.agc[i]);
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_3,
+				    WM9090_AGC_ENA, WM9090_AGC_ENA);
+	} else {
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_3,
+				    WM9090_AGC_ENA, 0);
+	}
+
+	return 0;
+
+}
+
+/*
+ * The machine driver should call this from their set_bias_level; if there
+ * isn't one then this can just be set as the set_bias_level function.
+ */
+static int wm9090_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	u16 *reg_cache = codec->reg_cache;
+	int i, ret;
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		break;
+
+	case SND_SOC_BIAS_PREPARE:
+		snd_soc_update_bits(codec, WM9090_ANTIPOP2, WM9090_VMID_ENA,
+				    WM9090_VMID_ENA);
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_1,
+				    WM9090_BIAS_ENA |
+				    WM9090_VMID_RES_MASK,
+				    WM9090_BIAS_ENA |
+				    1 << WM9090_VMID_RES_SHIFT);
+		msleep(1);  /* Probably an overestimate */
+		break;
+
+	case SND_SOC_BIAS_STANDBY:
+		if (codec->bias_level == SND_SOC_BIAS_OFF) {
+			/* Restore the register cache */
+			for (i = 1; i < codec->reg_cache_size; i++) {
+				if (reg_cache[i] == wm9090_reg_defaults[i])
+					continue;
+				if (wm9090_volatile(i))
+					continue;
+
+				ret = snd_soc_write(codec, i, reg_cache[i]);
+				if (ret != 0)
+					dev_warn(codec->dev,
+						 "Failed to restore register %d: %d\n",
+						 i, ret);
+			}
+		}
+
+		/* We keep VMID off during standby since the combination of
+		 * ground referenced outputs and class D speaker mean that
+		 * latency is not an issue.
+		 */
+		snd_soc_update_bits(codec, WM9090_POWER_MANAGEMENT_1,
+				    WM9090_BIAS_ENA | WM9090_VMID_RES_MASK, 0);
+		snd_soc_update_bits(codec, WM9090_ANTIPOP2,
+				    WM9090_VMID_ENA, 0);
+		break;
+
+	case SND_SOC_BIAS_OFF:
+		break;
+	}
+
+	codec->bias_level = level;
+
+	return 0;
+}
+
+static int wm9090_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec;
+	int ret = 0;
+
+	if (wm9090_codec == NULL) {
+		dev_err(&pdev->dev, "Codec device not registered\n");
+		return -ENODEV;
+	}
+
+	socdev->card->codec = wm9090_codec;
+	codec = wm9090_codec;
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret < 0) {
+		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
+		goto pcm_err;
+	}
+
+	wm9090_add_controls(codec);
+
+	return 0;
+
+pcm_err:
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int wm9090_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	wm9090_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	return 0;
+}
+
+static int wm9090_resume(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	wm9090_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	return 0;
+}
+#else
+#define wm9090_suspend NULL
+#define wm9090_resume NULL
+#endif
+
+static int wm9090_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm9090 = {
+	.probe = 	wm9090_probe,
+	.remove = 	wm9090_remove,
+	.suspend = 	wm9090_suspend,
+	.resume =	wm9090_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm9090);
+
+static int wm9090_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct wm9090_priv *wm9090;
+	struct snd_soc_codec *codec;
+	int ret;
+
+	wm9090 = kzalloc(sizeof(*wm9090), GFP_KERNEL);
+	if (wm9090 == NULL) {
+		dev_err(&i2c->dev, "Can not allocate memory\n");
+		return -ENOMEM;
+	}
+	codec = &wm9090->codec;
+
+	if (i2c->dev.platform_data)
+		memcpy(&wm9090->pdata, i2c->dev.platform_data,
+		       sizeof(wm9090->pdata));
+
+	wm9090_codec = codec;
+
+	i2c_set_clientdata(i2c, wm9090);
+
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	codec->control_data = i2c;
+	snd_soc_codec_set_drvdata(codec, wm9090);
+	codec->dev = &i2c->dev;
+	codec->name = "WM9090";
+	codec->owner = THIS_MODULE;
+	codec->bias_level = SND_SOC_BIAS_OFF;
+	codec->set_bias_level = wm9090_set_bias_level,
+	codec->reg_cache_size = WM9090_MAX_REGISTER + 1;
+	codec->reg_cache = &wm9090->reg_cache;
+	codec->volatile_register = wm9090_volatile;
+
+	ret = snd_soc_codec_set_cache_io(codec, 8, 16, SND_SOC_I2C);
+	if (ret != 0) {
+		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
+		goto err;
+	}
+
+	memcpy(&wm9090->reg_cache, wm9090_reg_defaults,
+	       sizeof(wm9090->reg_cache));
+
+	ret = snd_soc_read(codec, WM9090_SOFTWARE_RESET);
+	if (ret < 0)
+		goto err;
+	if (ret != wm9090_reg_defaults[WM9090_SOFTWARE_RESET]) {
+		dev_err(&i2c->dev, "Device is not a WM9090, ID=%x\n", ret);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	ret = snd_soc_write(codec, WM9090_SOFTWARE_RESET, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Configure some defaults; they will be written out when we
+	 * bring the bias up.
+	 */
+	wm9090->reg_cache[WM9090_IN1_LINE_INPUT_A_VOLUME] |= WM9090_IN1_VU
+		| WM9090_IN1A_ZC;
+	wm9090->reg_cache[WM9090_IN1_LINE_INPUT_B_VOLUME] |= WM9090_IN1_VU
+		| WM9090_IN1B_ZC;
+	wm9090->reg_cache[WM9090_IN2_LINE_INPUT_A_VOLUME] |= WM9090_IN2_VU
+		| WM9090_IN2A_ZC;
+	wm9090->reg_cache[WM9090_IN2_LINE_INPUT_B_VOLUME] |= WM9090_IN2_VU
+		| WM9090_IN2B_ZC;
+	wm9090->reg_cache[WM9090_SPEAKER_VOLUME_LEFT] |=
+		WM9090_SPKOUT_VU | WM9090_SPKOUTL_ZC;
+	wm9090->reg_cache[WM9090_LEFT_OUTPUT_VOLUME] |= 
+		WM9090_HPOUT1_VU | WM9090_HPOUT1L_ZC;
+	wm9090->reg_cache[WM9090_RIGHT_OUTPUT_VOLUME] |=
+		WM9090_HPOUT1_VU | WM9090_HPOUT1R_ZC;
+
+	wm9090->reg_cache[WM9090_CLOCKING_1] |= WM9090_TOCLK_ENA;
+
+	wm9090_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	ret = snd_soc_register_codec(codec);
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
+		goto err_bias;
+	}
+
+	return 0;
+
+err_bias:
+	wm9090_set_bias_level(codec, SND_SOC_BIAS_OFF);
+err:
+	kfree(wm9090);
+	i2c_set_clientdata(i2c, NULL);
+	wm9090_codec = NULL;
+
+	return ret;
+}
+
+static int wm9090_i2c_remove(struct i2c_client *i2c)
+{
+	struct wm9090_priv *wm9090 = i2c_get_clientdata(i2c);
+	struct snd_soc_codec *codec = &wm9090->codec;
+
+	snd_soc_unregister_codec(codec);
+	wm9090_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	kfree(wm9090);
+	wm9090_codec = NULL;
+
+	return 0;
+}
+
+static const struct i2c_device_id wm9090_id[] = {
+	{ "wm9090", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm9090_id);
+
+static struct i2c_driver wm9090_i2c_driver = {
+	.driver = {
+		.name = "wm9090",
+		.owner = THIS_MODULE,
+	},
+	.probe = wm9090_i2c_probe,
+	.remove = __devexit_p(wm9090_i2c_remove),
+	.id_table = wm9090_id,
+};
+
+static int __init wm9090_init(void)
+{
+	return i2c_add_driver(&wm9090_i2c_driver);
+}
+module_init(wm9090_init);
+
+static void __exit wm9090_exit(void)
+{
+	i2c_del_driver(&wm9090_i2c_driver);
+}
+module_exit(wm9090_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM9090 ASoC driver");
+MODULE_LICENSE("GPL");