/* * arizona-micsupp.c -- Microphone supply for Arizona devices * * Copyright 2012 Wolfson Microelectronics PLC. * * Author: Mark Brown * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f struct arizona_micsupp { struct regulator_dev *regulator; struct arizona *arizona; struct regulator_consumer_supply supply; struct regulator_init_data init_data; struct work_struct check_cp_work; }; static int arizona_micsupp_list_voltage(struct regulator_dev *rdev, unsigned int selector) { if (selector > ARIZONA_MICSUPP_MAX_SELECTOR) return -EINVAL; if (selector == ARIZONA_MICSUPP_MAX_SELECTOR) return 3300000; else return (selector * 50000) + 1700000; } static int arizona_micsupp_map_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { unsigned int voltage; int selector; if (min_uV < 1700000) min_uV = 1700000; if (min_uV > 3200000) selector = ARIZONA_MICSUPP_MAX_SELECTOR; else selector = DIV_ROUND_UP(min_uV - 1700000, 50000); if (selector < 0) return -EINVAL; voltage = arizona_micsupp_list_voltage(rdev, selector); if (voltage < min_uV || voltage > max_uV) return -EINVAL; return selector; } static void arizona_micsupp_check_cp(struct work_struct *work) { struct arizona_micsupp *micsupp = container_of(work, struct arizona_micsupp, check_cp_work); struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm; struct arizona *arizona = micsupp->arizona; struct regmap *regmap = arizona->regmap; unsigned int reg; int ret; ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, ®); if (ret != 0) { dev_err(arizona->dev, "Failed to read CP state: %d\n", ret); return; } if (dapm) { if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) == ARIZONA_CPMIC_ENA) snd_soc_dapm_force_enable_pin(dapm, "MICSUPP"); else snd_soc_dapm_disable_pin(dapm, "MICSUPP"); snd_soc_dapm_sync(dapm); } } static int arizona_micsupp_enable(struct regulator_dev *rdev) { struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); int ret; ret = regulator_enable_regmap(rdev); if (ret == 0) schedule_work(&micsupp->check_cp_work); return ret; } static int arizona_micsupp_disable(struct regulator_dev *rdev) { struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); int ret; ret = regulator_disable_regmap(rdev); if (ret == 0) schedule_work(&micsupp->check_cp_work); return ret; } static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena) { struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); int ret; ret = regulator_set_bypass_regmap(rdev, ena); if (ret == 0) schedule_work(&micsupp->check_cp_work); return ret; } static struct regulator_ops arizona_micsupp_ops = { .enable = arizona_micsupp_enable, .disable = arizona_micsupp_disable, .is_enabled = regulator_is_enabled_regmap, .list_voltage = arizona_micsupp_list_voltage, .map_voltage = arizona_micsupp_map_voltage, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .get_bypass = regulator_get_bypass_regmap, .set_bypass = arizona_micsupp_set_bypass, }; static const struct regulator_desc arizona_micsupp = { .name = "MICVDD", .supply_name = "CPVDD", .type = REGULATOR_VOLTAGE, .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1, .ops = &arizona_micsupp_ops, .vsel_reg = ARIZONA_LDO2_CONTROL_1, .vsel_mask = ARIZONA_LDO2_VSEL_MASK, .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, .enable_mask = ARIZONA_CPMIC_ENA, .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1, .bypass_mask = ARIZONA_CPMIC_BYPASS, .enable_time = 3000, .owner = THIS_MODULE, }; static const struct regulator_init_data arizona_micsupp_default = { .constraints = { .valid_ops_mask = REGULATOR_CHANGE_STATUS | REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_BYPASS, .min_uV = 1700000, .max_uV = 3300000, }, .num_consumer_supplies = 1, }; static int arizona_micsupp_probe(struct platform_device *pdev) { struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); struct regulator_config config = { }; struct arizona_micsupp *micsupp; int ret; micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL); if (micsupp == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } micsupp->arizona = arizona; INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp); /* * Since the chip usually supplies itself we provide some * default init_data for it. This will be overridden with * platform data if provided. */ micsupp->init_data = arizona_micsupp_default; micsupp->init_data.consumer_supplies = &micsupp->supply; micsupp->supply.supply = "MICVDD"; micsupp->supply.dev_name = dev_name(arizona->dev); config.dev = arizona->dev; config.driver_data = micsupp; config.regmap = arizona->regmap; if (arizona->pdata.micvdd) config.init_data = arizona->pdata.micvdd; else config.init_data = &micsupp->init_data; /* Default to regulated mode until the API supports bypass */ regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1, ARIZONA_CPMIC_BYPASS, 0); micsupp->regulator = regulator_register(&arizona_micsupp, &config); if (IS_ERR(micsupp->regulator)) { ret = PTR_ERR(micsupp->regulator); dev_err(arizona->dev, "Failed to register mic supply: %d\n", ret); return ret; } platform_set_drvdata(pdev, micsupp); return 0; } static int arizona_micsupp_remove(struct platform_device *pdev) { struct arizona_micsupp *micsupp = platform_get_drvdata(pdev); regulator_unregister(micsupp->regulator); return 0; } static struct platform_driver arizona_micsupp_driver = { .probe = arizona_micsupp_probe, .remove = arizona_micsupp_remove, .driver = { .name = "arizona-micsupp", .owner = THIS_MODULE, }, }; module_platform_driver(arizona_micsupp_driver); /* Module information */ MODULE_AUTHOR("Mark Brown "); MODULE_DESCRIPTION("Arizona microphone supply driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:arizona-micsupp");