diff options
Diffstat (limited to 'kernel/sound/soc/codecs/max9768.c')
| -rw-r--r-- | kernel/sound/soc/codecs/max9768.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/kernel/sound/soc/codecs/max9768.c b/kernel/sound/soc/codecs/max9768.c new file mode 100644 index 000000000..e1c196a41 --- /dev/null +++ b/kernel/sound/soc/codecs/max9768.c @@ -0,0 +1,255 @@ +/* + * 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_soc_kcontrol_codec(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_soc_kcontrol_codec(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("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio), +}; + +static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = { +SND_SOC_DAPM_INPUT("IN"), + +SND_SOC_DAPM_OUTPUT("OUT+"), +SND_SOC_DAPM_OUTPUT("OUT-"), +}; + +static const struct snd_soc_dapm_route max9768_dapm_routes[] = { + { "OUT+", NULL, "IN" }, + { "OUT-", NULL, "IN" }, +}; + +static int max9768_probe(struct snd_soc_codec *codec) +{ + struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec); + int 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_codec_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), + .dapm_widgets = max9768_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets), + .dapm_routes = max9768_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes), +}; + +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), + .cache_type = REGCACHE_RBTREE, +}; + +static int 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 = devm_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_gpio_free; + + return 0; + + 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 max9768_i2c_remove(struct i2c_client *client) +{ + struct max9768 *max9768 = i2c_get_clientdata(client); + + snd_soc_unregister_codec(&client->dev); + + 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 = 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"); |