/* * 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 const 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_component *c = snd_soc_kcontrol_component(kcontrol); struct max9768 *max9768 = snd_soc_component_get_drvdata(c); 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_component *c = snd_soc_kcontrol_component(kcontrol); struct max9768 *max9768 = snd_soc_component_get_drvdata(c); gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]); return 0; } static const DECLARE_TLV_DB_RANGE(volume_tlv, 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_component *component) { struct max9768 *max9768 = snd_soc_component_get_drvdata(component); int ret; if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) { ret = regmap_write(max9768->regmap, MAX9768_CTRL, MAX9768_CTRL_PWM); if (ret) return ret; } if (gpio_is_valid(max9768->mute_gpio)) { ret = snd_soc_add_component_controls(component, max9768_mute, ARRAY_SIZE(max9768_mute)); if (ret) return ret; } return 0; } static const struct snd_soc_component_driver max9768_component_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 = devm_gpio_request_one(&client->dev, pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute"); max9768->mute_gpio = err ?: pdata->mute_gpio; /* Activate chip by releasing shutdown, enables I2C */ err = devm_gpio_request_one(&client->dev, 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)) return PTR_ERR(max9768->regmap); return devm_snd_soc_register_component(&client->dev, &max9768_component_driver, NULL, 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", }, .probe = max9768_i2c_probe, .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");