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ASoC: max9768: add driver for max9768 amplifier

Add a driver supporting the volume control and the mute pin. Shdn pin
and DAPM are not taken care of yet.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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1 parent ffa8d9d commit 394d2bbae3dbde0972b90415fc4b5628bbfd700f Wolfram Sang committed with broonie Jan 27, 2012
Showing with 283 additions and 0 deletions.
  1. +24 −0 include/sound/max9768.h
  2. +4 −0 sound/soc/codecs/Kconfig
  3. +2 −0 sound/soc/codecs/Makefile
  4. +253 −0 sound/soc/codecs/max9768.c
View
@@ -0,0 +1,24 @@
+/*
+ * Platform data for MAX9768
+ * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
+ * same licence as the driver
+ */
+
+#ifndef __SOUND_MAX9768_PDATA_H__
+#define __SOUND_MAX9768_PDATA_H__
+
+/**
+ * struct max9768_pdata - optional platform specific MAX9768 configuration
+ * @shdn_gpio: GPIO to SHDN pin. If not valid, pin must be hardwired HIGH
+ * @mute_gpio: GPIO to MUTE pin. If not valid, control for mute won't be added
+ * @flags: configuration flags, e.g. set classic PWM mode (check datasheet
+ * regarding "filterless modulation" which is default).
+ */
+struct max9768_pdata {
+ int shdn_gpio;
+ int mute_gpio;
+ unsigned flags;
+#define MAX9768_FLAG_CLASSIC_PWM (1 << 0)
+};
+
+#endif /* __SOUND_MAX9768_PDATA_H__*/
View
@@ -40,6 +40,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_MAX98088 if I2C
select SND_SOC_MAX98095 if I2C
select SND_SOC_MAX9850 if I2C
+ select SND_SOC_MAX9768 if I2C
select SND_SOC_MAX9877 if I2C
select SND_SOC_PCM3008
select SND_SOC_RT5631 if I2C
@@ -429,6 +430,9 @@ config SND_SOC_WM9713
config SND_SOC_LM4857
tristate
+config SND_SOC_MAX9768
+ tristate
+
config SND_SOC_MAX9877
tristate
@@ -25,6 +25,7 @@ snd-soc-dmic-objs := dmic.o
snd-soc-jz4740-codec-objs := jz4740.o
snd-soc-l3-objs := l3.o
snd-soc-lm4857-objs := lm4857.o
+snd-soc-max9768-objs := max9768.o
snd-soc-max98088-objs := max98088.o
snd-soc-max98095-objs := max98095.o
snd-soc-max9850-objs := max9850.o
@@ -130,6 +131,7 @@ obj-$(CONFIG_SND_SOC_DMIC) += snd-soc-dmic.o
obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o
obj-$(CONFIG_SND_SOC_LM4857) += snd-soc-lm4857.o
obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o
+obj-$(CONFIG_SND_SOC_MAX9768) += snd-soc-max9768.o
obj-$(CONFIG_SND_SOC_MAX98088) += snd-soc-max98088.o
obj-$(CONFIG_SND_SOC_MAX98095) += snd-soc-max98095.o
obj-$(CONFIG_SND_SOC_MAX9850) += snd-soc-max9850.o
View
@@ -0,0 +1,253 @@
+/*
+ * MAX9768 AMP driver
+ *
+ * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/regmap.h>
+
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <sound/max9768.h>
+
+/* "Registers" */
+#define MAX9768_VOL 0
+#define MAX9768_CTRL 3
+
+/* Commands */
+#define MAX9768_CTRL_PWM 0x15
+#define MAX9768_CTRL_FILTERLESS 0x16
+
+struct max9768 {
+ struct regmap *regmap;
+ int mute_gpio;
+ int shdn_gpio;
+ u32 flags;
+};
+
+static struct reg_default max9768_default_regs[] = {
+ { 0, 0 },
+ { 3, MAX9768_CTRL_FILTERLESS},
+};
+
+static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
+ int val = gpio_get_value_cansleep(max9768->mute_gpio);
+
+ ucontrol->value.integer.value[0] = !val;
+
+ return 0;
+}
+
+static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
+
+ gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]);
+
+ return 0;
+}
+
+static const unsigned int volume_tlv[] = {
+ TLV_DB_RANGE_HEAD(43),
+ 0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
+ 1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
+ 2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
+ 3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
+ 4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
+ 5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
+ 6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
+ 7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
+ 8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
+ 9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
+ 10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
+ 11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
+ 12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
+ 13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
+ 14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
+ 15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
+ 18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
+ 19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
+ 20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
+ 21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
+ 22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
+ 23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
+ 24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
+ 25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
+ 26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
+ 27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
+ 28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
+ 31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
+ 32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
+ 35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
+ 38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
+ 40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
+ 41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
+ 42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
+ 43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
+ 44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
+ 45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
+ 46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
+ 47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
+ 51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
+ 58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
+ 59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
+ 63, 63, TLV_DB_SCALE_ITEM(950, 0, 0),
+};
+
+static const struct snd_kcontrol_new max9768_volume[] = {
+ SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
+};
+
+static const struct snd_kcontrol_new max9768_mute[] = {
+ SOC_SINGLE_BOOL_EXT("Mute Switch", 0, max9768_get_gpio, max9768_set_gpio),
+};
+
+static int max9768_probe(struct snd_soc_codec *codec)
+{
+ struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
+ codec->control_data = max9768->regmap;
+ ret = snd_soc_codec_set_cache_io(codec, 2, 6, SND_SOC_REGMAP);
+ if (ret)
+ return ret;
+
+ if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
+ ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
+ if (ret)
+ return ret;
+ }
+
+ if (gpio_is_valid(max9768->mute_gpio)) {
+ ret = snd_soc_add_controls(codec, max9768_mute,
+ ARRAY_SIZE(max9768_mute));
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct snd_soc_codec_driver max9768_codec_driver = {
+ .probe = max9768_probe,
+ .controls = max9768_volume,
+ .num_controls = ARRAY_SIZE(max9768_volume),
+};
+
+static bool max9768_always_false(struct device *dev, unsigned int reg)
+{
+ return false;
+}
+
+static const struct regmap_config max9768_i2c_regmap_config = {
+ .reg_bits = 2,
+ .val_bits = 6,
+ .max_register = 3,
+ .reg_defaults = max9768_default_regs,
+ .num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
+ .volatile_reg = max9768_always_false,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int __devinit max9768_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max9768 *max9768;
+ struct max9768_pdata *pdata = client->dev.platform_data;
+ int err;
+
+ max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
+ if (!max9768)
+ return -ENOMEM;
+
+ if (pdata) {
+ /* Mute on powerup to avoid clicks */
+ err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
+ max9768->mute_gpio = err ?: pdata->mute_gpio;
+
+ /* Activate chip by releasing shutdown, enables I2C */
+ err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
+ max9768->shdn_gpio = err ?: pdata->shdn_gpio;
+
+ max9768->flags = pdata->flags;
+ } else {
+ max9768->shdn_gpio = -EINVAL;
+ max9768->mute_gpio = -EINVAL;
+ }
+
+ i2c_set_clientdata(client, max9768);
+
+ max9768->regmap = regmap_init_i2c(client, &max9768_i2c_regmap_config);
+ if (IS_ERR(max9768->regmap)) {
+ err = PTR_ERR(max9768->regmap);
+ goto err_gpio_free;
+ }
+
+ err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
+ if (err)
+ goto err_regmap_free;
+
+ return 0;
+
+ err_regmap_free:
+ regmap_exit(max9768->regmap);
+ err_gpio_free:
+ if (gpio_is_valid(max9768->shdn_gpio))
+ gpio_free(max9768->shdn_gpio);
+ if (gpio_is_valid(max9768->mute_gpio))
+ gpio_free(max9768->mute_gpio);
+
+ return err;
+}
+
+static int __devexit max9768_i2c_remove(struct i2c_client *client)
+{
+ struct max9768 *max9768 = i2c_get_clientdata(client);
+
+ snd_soc_unregister_codec(&client->dev);
+ regmap_exit(max9768->regmap);
+
+ if (gpio_is_valid(max9768->shdn_gpio))
+ gpio_free(max9768->shdn_gpio);
+ if (gpio_is_valid(max9768->mute_gpio))
+ gpio_free(max9768->mute_gpio);
+
+ return 0;
+}
+
+static const struct i2c_device_id max9768_i2c_id[] = {
+ { "max9768", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
+
+static struct i2c_driver max9768_i2c_driver = {
+ .driver = {
+ .name = "max9768",
+ .owner = THIS_MODULE,
+ },
+ .probe = max9768_i2c_probe,
+ .remove = __devexit_p(max9768_i2c_remove),
+ .id_table = max9768_i2c_id,
+};
+module_i2c_driver(max9768_i2c_driver);
+
+MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
+MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
+MODULE_LICENSE("GPL v2");

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