fishHEADmaster

1 files changed, 265 insertions, 0 deletions

diff --git a/drivers/regulator/arizona-micsupp.c b/drivers/regulator/arizona-micsupp.c
new file mode 100644
index 0000000..e87536b
--- /dev/null
+++ b/drivers/regulator/arizona-micsupp.c
@@ -0,0 +1,265 @@
+/*
+ * arizona-micsupp.c  --  Microphone supply for Arizona devices
+ *
+ * Copyright 2012 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  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 <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <sound/soc.h>
+
+#include <linux/mfd/arizona/core.h>
+#include <linux/mfd/arizona/pdata.h>
+#include <linux/mfd/arizona/registers.h>
+
+#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, &reg);
+	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 <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("Arizona microphone supply driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:arizona-micsupp");