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e6ed90581b
If we are in non-bypass mode then the SYSCLK is required for full charge pump operation, otherwise we will fall back to bypass mode. Use the DAPM context exposed by the ASoC driver to manage this. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
265 lines
6.6 KiB
C
265 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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.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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