mirror of
https://github.com/edk2-porting/linux-next.git
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9fc50a2ead
This will be used as part of low power accessory detect. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/*
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* arizona-micsupp.c -- Microphone supply for Arizona devices
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*
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* Copyright 2012 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <sound/soc.h>
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#include <linux/mfd/arizona/core.h>
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#include <linux/mfd/arizona/pdata.h>
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#include <linux/mfd/arizona/registers.h>
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#define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
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struct arizona_micsupp {
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struct regulator_dev *regulator;
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struct arizona *arizona;
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struct regulator_consumer_supply supply;
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struct regulator_init_data init_data;
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struct work_struct check_cp_work;
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};
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static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
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unsigned int selector)
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{
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if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
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return -EINVAL;
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if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
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return 3300000;
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else
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return (selector * 50000) + 1700000;
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}
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static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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unsigned int voltage;
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int selector;
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if (min_uV < 1700000)
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min_uV = 1700000;
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if (min_uV > 3200000)
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selector = ARIZONA_MICSUPP_MAX_SELECTOR;
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else
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selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
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if (selector < 0)
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return -EINVAL;
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voltage = arizona_micsupp_list_voltage(rdev, selector);
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if (voltage < min_uV || voltage > max_uV)
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return -EINVAL;
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return selector;
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}
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static void arizona_micsupp_check_cp(struct work_struct *work)
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{
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struct arizona_micsupp *micsupp =
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container_of(work, struct arizona_micsupp, check_cp_work);
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struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm;
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struct arizona *arizona = micsupp->arizona;
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struct regmap *regmap = arizona->regmap;
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unsigned int reg;
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int ret;
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ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, ®);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to read CP state: %d\n", ret);
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return;
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}
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if (dapm) {
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if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
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ARIZONA_CPMIC_ENA)
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snd_soc_dapm_force_enable_pin(dapm, "MICSUPP");
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else
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snd_soc_dapm_disable_pin(dapm, "MICSUPP");
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snd_soc_dapm_sync(dapm);
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}
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}
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static int arizona_micsupp_enable(struct regulator_dev *rdev)
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{
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struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
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int ret;
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ret = regulator_enable_regmap(rdev);
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if (ret == 0)
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schedule_work(&micsupp->check_cp_work);
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return ret;
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}
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static int arizona_micsupp_disable(struct regulator_dev *rdev)
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{
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struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
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int ret;
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ret = regulator_disable_regmap(rdev);
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if (ret == 0)
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schedule_work(&micsupp->check_cp_work);
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return ret;
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}
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static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
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{
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struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
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int ret;
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ret = regulator_set_bypass_regmap(rdev, ena);
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if (ret == 0)
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schedule_work(&micsupp->check_cp_work);
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return ret;
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}
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static struct regulator_ops arizona_micsupp_ops = {
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.enable = arizona_micsupp_enable,
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.disable = arizona_micsupp_disable,
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.is_enabled = regulator_is_enabled_regmap,
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.list_voltage = arizona_micsupp_list_voltage,
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.map_voltage = arizona_micsupp_map_voltage,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_bypass = regulator_get_bypass_regmap,
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.set_bypass = arizona_micsupp_set_bypass,
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};
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static const struct regulator_desc arizona_micsupp = {
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.name = "MICVDD",
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.supply_name = "CPVDD",
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.type = REGULATOR_VOLTAGE,
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.n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
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.ops = &arizona_micsupp_ops,
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.vsel_reg = ARIZONA_LDO2_CONTROL_1,
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.vsel_mask = ARIZONA_LDO2_VSEL_MASK,
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.enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
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.enable_mask = ARIZONA_CPMIC_ENA,
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.bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
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.bypass_mask = ARIZONA_CPMIC_BYPASS,
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.enable_time = 3000,
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.owner = THIS_MODULE,
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};
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static const struct regulator_init_data arizona_micsupp_default = {
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.constraints = {
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.valid_ops_mask = REGULATOR_CHANGE_STATUS |
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REGULATOR_CHANGE_VOLTAGE |
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REGULATOR_CHANGE_BYPASS,
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.min_uV = 1700000,
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.max_uV = 3300000,
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},
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.num_consumer_supplies = 1,
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};
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static int arizona_micsupp_probe(struct platform_device *pdev)
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{
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struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
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struct regulator_config config = { };
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struct arizona_micsupp *micsupp;
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int ret;
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micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
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if (micsupp == NULL) {
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dev_err(&pdev->dev, "Unable to allocate private data\n");
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return -ENOMEM;
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}
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micsupp->arizona = arizona;
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INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
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/*
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* Since the chip usually supplies itself we provide some
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* default init_data for it. This will be overridden with
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* platform data if provided.
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*/
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micsupp->init_data = arizona_micsupp_default;
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micsupp->init_data.consumer_supplies = &micsupp->supply;
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micsupp->supply.supply = "MICVDD";
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micsupp->supply.dev_name = dev_name(arizona->dev);
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config.dev = arizona->dev;
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config.driver_data = micsupp;
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config.regmap = arizona->regmap;
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if (arizona->pdata.micvdd)
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config.init_data = arizona->pdata.micvdd;
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else
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config.init_data = &micsupp->init_data;
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/* Default to regulated mode until the API supports bypass */
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regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
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ARIZONA_CPMIC_BYPASS, 0);
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micsupp->regulator = regulator_register(&arizona_micsupp, &config);
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if (IS_ERR(micsupp->regulator)) {
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ret = PTR_ERR(micsupp->regulator);
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dev_err(arizona->dev, "Failed to register mic supply: %d\n",
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ret);
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return ret;
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}
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platform_set_drvdata(pdev, micsupp);
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return 0;
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}
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static int arizona_micsupp_remove(struct platform_device *pdev)
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{
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struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
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regulator_unregister(micsupp->regulator);
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return 0;
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}
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static struct platform_driver arizona_micsupp_driver = {
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.probe = arizona_micsupp_probe,
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.remove = arizona_micsupp_remove,
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.driver = {
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.name = "arizona-micsupp",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(arizona_micsupp_driver);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("Arizona microphone supply driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:arizona-micsupp");
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