regulator: arizona: Add support for microphone supplies on Arizona devices

The Wolfson Arizona platform is used for a range of low power audio hub
CODECs. Many of these devices feature an integrated power supply for the
microphone which is supported by this driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 434462ada7c08bddc9f6b706b3a8977a3a40dae9..e056c09661a26d54a1375f0b45e5af2f30b697b8 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -89,6 +89,13 @@ config REGULATOR_AAT2870
          If you have a AnalogicTech AAT2870 say Y to enable the
          regulator driver.
 
+config REGULATOR_ARIZONA
+       tristate "Wolfson Arizona class devices"
+       depends on MFD_ARIZONA
+       help
+         Support for the regulators found on Wolfson Arizona class
+         devices.
+
 config REGULATOR_DA903X
        tristate "Dialog Semiconductor DA9030/DA9034 regulators"
        depends on PMIC_DA903X

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index e6f700748a3b114640c1e2a4485f7b673b914616..ec4a0cfb3ca7d9bbe81cf89e4c2187062c2e7694 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
 obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
 obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
+obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o
 obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
 obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
 obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o

diff --git a/drivers/regulator/arizona-micsupp.c b/drivers/regulator/arizona-micsupp.c
new file mode 100644 (file)
index 0000000..97d85b0
--- /dev/null
+++ b/drivers/regulator/arizona-micsupp.c
@@ -0,0 +1,184 @@
+/*
+ * 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/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;
+};
+
+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 >= 3300000)
+               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 struct regulator_ops arizona_micsupp_ops = {
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .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,
+};
+
+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,
+
+       .owner = THIS_MODULE,
+};
+
+static const struct regulator_init_data arizona_micsupp_default = {
+       .constraints = {
+               .valid_ops_mask = REGULATOR_CHANGE_STATUS |
+                               REGULATOR_CHANGE_VOLTAGE,
+               .min_uV = 1700000,
+               .max_uV = 3300000,
+       },
+
+       .num_consumer_supplies = 1,
+};
+
+static __devinit 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;
+
+       /*
+        * 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;
+
+       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 __devexit 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 = __devexit_p(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");