ASoC: neo1973_wm8753: Move lm4857 specefic code to its own module

This patch moves the code for the lm4857 AMP from the neo1973_wm8753 sound
board driver to its own module.
The lm4857 is a generic AMP IC and not specific to the neo1973.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 276 insertions, 0 deletions

diff --git a/sound/soc/codecs/lm4857.c b/sound/soc/codecs/lm4857.c
new file mode 100644
index 000000000000..72de47e5d040
--- /dev/null
+++ b/sound/soc/codecs/lm4857.c
@@ -0,0 +1,276 @@
+/*
+ * LM4857 AMP driver
+ *
+ * Copyright 2007 Wolfson Microelectronics PLC.
+ * Author: Graeme Gregory
+ *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ * Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
+ *
+ *  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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+struct lm4857 {
+	struct i2c_client *i2c;
+	uint8_t mode;
+};
+
+static const uint8_t lm4857_default_regs[] = {
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/* The register offsets in the cache array */
+#define LM4857_MVOL 0
+#define LM4857_LVOL 1
+#define LM4857_RVOL 2
+#define LM4857_CTRL 3
+
+/* the shifts required to set these bits */
+#define LM4857_3D 5
+#define LM4857_WAKEUP 5
+#define LM4857_EPGAIN 4
+
+static int lm4857_write(struct snd_soc_codec *codec, unsigned int reg,
+		unsigned int value)
+{
+	uint8_t data;
+	int ret;
+
+	ret = snd_soc_cache_write(codec, reg, value);
+	if (ret < 0)
+		return ret;
+
+	data = (reg << 6) | value;
+	ret = i2c_master_send(codec->control_data, &data, 1);
+	if (ret != 1) {
+		dev_err(codec->dev, "Failed to write register: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static unsigned int lm4857_read(struct snd_soc_codec *codec,
+		unsigned int reg)
+{
+	unsigned int val;
+	int ret;
+
+	ret = snd_soc_cache_read(codec, reg, &val);
+	if (ret)
+		return -1;
+
+	return val;
+}
+
+static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+
+	ucontrol->value.integer.value[0] = lm4857->mode;
+
+	return 0;
+}
+
+static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+	uint8_t value = ucontrol->value.integer.value[0];
+
+	lm4857->mode = value;
+
+	if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
+		snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, value + 6);
+
+	return 1;
+}
+
+static int lm4857_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, lm4857->mode + 6);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, 0);
+		break;
+	default:
+		break;
+	}
+
+	codec->dapm.bias_level = level;
+
+	return 0;
+}
+
+static const char *lm4857_mode[] = {
+	"Earpiece",
+	"Loudspeaker",
+	"Loudspeaker + Headphone",
+	"Headphone",
+};
+
+static const struct soc_enum lm4857_mode_enum =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode);
+
+static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
+	SND_SOC_DAPM_INPUT("IN"),
+
+	SND_SOC_DAPM_OUTPUT("LS"),
+	SND_SOC_DAPM_OUTPUT("HP"),
+	SND_SOC_DAPM_OUTPUT("EP"),
+};
+
+static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
+static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
+
+static const struct snd_kcontrol_new lm4857_controls[] = {
+	SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
+		stereo_tlv),
+	SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
+		stereo_tlv),
+	SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
+		mono_tlv),
+	SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
+	SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
+	SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
+		LM4857_WAKEUP, 1, 0),
+	SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
+		LM4857_EPGAIN, 1, 0),
+
+	SOC_ENUM_EXT("Mode", lm4857_mode_enum,
+		lm4857_get_mode, lm4857_set_mode),
+};
+
+/* There is a demux inbetween the the input signal and the output signals.
+ * Currently there is no easy way to model it in ASoC and since it does not make
+ * much of a difference in practice simply connect the input direclty to the
+ * outputs. */
+static const struct snd_soc_dapm_route lm4857_routes[] = {
+	{"LS", NULL, "IN"},
+	{"HP", NULL, "IN"},
+	{"EP", NULL, "IN"},
+};
+
+static int lm4857_probe(struct snd_soc_codec *codec)
+{
+	struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+	struct snd_soc_dapm_context *dapm = &codec->dapm;
+	int ret;
+
+	codec->control_data = lm4857->i2c;
+
+	ret = snd_soc_add_controls(codec, lm4857_controls,
+			ARRAY_SIZE(lm4857_controls));
+	if (ret)
+		return ret;
+
+	ret = snd_soc_dapm_new_controls(dapm, lm4857_dapm_widgets,
+			ARRAY_SIZE(lm4857_dapm_widgets));
+	if (ret)
+		return ret;
+
+	ret = snd_soc_dapm_add_routes(dapm, lm4857_routes,
+			ARRAY_SIZE(lm4857_routes));
+	if (ret)
+		return ret;
+
+	snd_soc_dapm_new_widgets(dapm);
+
+	return 0;
+}
+
+static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
+	.write = lm4857_write,
+	.read = lm4857_read,
+	.probe = lm4857_probe,
+	.reg_cache_size = ARRAY_SIZE(lm4857_default_regs),
+	.reg_word_size = sizeof(uint8_t),
+	.reg_cache_default = lm4857_default_regs,
+	.set_bias_level = lm4857_set_bias_level,
+};
+
+static int __devinit lm4857_i2c_probe(struct i2c_client *i2c,
+	const struct i2c_device_id *id)
+{
+	struct lm4857 *lm4857;
+	int ret;
+
+	lm4857 = kzalloc(sizeof(*lm4857), GFP_KERNEL);
+	if (!lm4857)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, lm4857);
+
+	lm4857->i2c = i2c;
+
+	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
+
+	if (ret) {
+		kfree(lm4857);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __devexit lm4857_i2c_remove(struct i2c_client *i2c)
+{
+	struct lm4857 *lm4857 = i2c_get_clientdata(i2c);
+
+	snd_soc_unregister_codec(&i2c->dev);
+	kfree(lm4857);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm4857_i2c_id[] = {
+	{ "lm4857", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
+
+static struct i2c_driver lm4857_i2c_driver = {
+	.driver = {
+		.name = "lm4857",
+		.owner = THIS_MODULE,
+	},
+	.probe = lm4857_i2c_probe,
+	.remove = __devexit_p(lm4857_i2c_remove),
+	.id_table = lm4857_i2c_id,
+};
+
+static int __init lm4857_init(void)
+{
+	return i2c_add_driver(&lm4857_i2c_driver);
+}
+module_init(lm4857_init);
+
+static void __exit lm4857_exit(void)
+{
+	i2c_del_driver(&lm4857_i2c_driver);
+}
+module_exit(lm4857_exit);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("LM4857 amplifier driver");
+MODULE_LICENSE("GPL");