1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/regulator/wm8400-regulator.c b/drivers/regulator/wm8400-regulator.c
new file mode 100644
index 00000000000..48b372e038a
--- /dev/null
+++ b/drivers/regulator/wm8400-regulator.c
@@ -0,0 +1,368 @@
+/*
+ * Regulator support for WM8400
+ *
+ * Copyright 2008 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/bug.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/wm8400-private.h>
+
+static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	u16 val;
+
+	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
+	return (val & WM8400_LDO1_ENA) != 0;
+}
+
+static int wm8400_ldo_enable(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+
+	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
+			       WM8400_LDO1_ENA, WM8400_LDO1_ENA);
+}
+
+static int wm8400_ldo_disable(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+
+	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
+			       WM8400_LDO1_ENA, 0);
+}
+
+static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	u16 val;
+
+	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
+	val &= WM8400_LDO1_VSEL_MASK;
+
+	if (val < 15)
+		return 900000 + (val * 50000);
+	else
+		return 1600000 + ((val - 14) * 100000);
+}
+
+static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
+				  int min_uV, int max_uV)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	u16 val;
+
+	if (min_uV < 900000 || min_uV > 3300000)
+		return -EINVAL;
+
+	if (min_uV < 1700000) {
+		/* Steps of 50mV from 900mV;  */
+		val = (min_uV - 850001) / 50000;
+
+		if ((val * 50000) + 900000 > max_uV)
+			return -EINVAL;
+		BUG_ON((val * 50000) + 900000 < min_uV);
+	} else {
+		/* Steps of 100mV from 1700mV */
+		val = ((min_uV - 1600001) / 100000);
+
+		if ((val * 100000) + 1700000 > max_uV)
+			return -EINVAL;
+		BUG_ON((val * 100000) + 1700000 < min_uV);
+
+		val += 0xf;
+	}
+
+	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
+			       WM8400_LDO1_VSEL_MASK, val);
+}
+
+static struct regulator_ops wm8400_ldo_ops = {
+	.is_enabled = wm8400_ldo_is_enabled,
+	.enable = wm8400_ldo_enable,
+	.disable = wm8400_ldo_disable,
+	.get_voltage = wm8400_ldo_get_voltage,
+	.set_voltage = wm8400_ldo_set_voltage,
+};
+
+static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+	u16 val;
+
+	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
+	return (val & WM8400_DC1_ENA) != 0;
+}
+
+static int wm8400_dcdc_enable(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+
+	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+			       WM8400_DC1_ENA, WM8400_DC1_ENA);
+}
+
+static int wm8400_dcdc_disable(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+
+	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+			       WM8400_DC1_ENA, 0);
+}
+
+static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	u16 val;
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+
+	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
+	val &= WM8400_DC1_VSEL_MASK;
+
+	return 850000 + (25000 * val);
+}
+
+static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
+				  int min_uV, int max_uV)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	u16 val;
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+
+	if (min_uV < 850000)
+		return -EINVAL;
+
+	val = (min_uV - 825001) / 25000;
+
+	if (850000 + (25000 * val) > max_uV)
+		return -EINVAL;
+	BUG_ON(850000 + (25000 * val) < min_uV);
+
+	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+			       WM8400_DC1_VSEL_MASK, val);
+}
+
+static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+	u16 data[2];
+	int ret;
+
+	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
+				data);
+	if (ret != 0)
+		return 0;
+
+	/* Datasheet: hibernate */
+	if (data[0] & WM8400_DC1_SLEEP)
+		return REGULATOR_MODE_STANDBY;
+
+	/* Datasheet: standby */
+	if (!(data[0] & WM8400_DC1_ACTIVE))
+		return REGULATOR_MODE_IDLE;
+
+	/* Datasheet: active with or without force PWM */
+	if (data[1] & WM8400_DC1_FRC_PWM)
+		return REGULATOR_MODE_FAST;
+	else
+		return REGULATOR_MODE_NORMAL;
+}
+
+static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
+{
+	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
+	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
+	int ret;
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		/* Datasheet: active with force PWM */
+		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
+				      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
+		if (ret != 0)
+			return ret;
+
+		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
+				       WM8400_DC1_ACTIVE);
+
+	case REGULATOR_MODE_NORMAL:
+		/* Datasheet: active */
+		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
+				      WM8400_DC1_FRC_PWM, 0);
+		if (ret != 0)
+			return ret;
+
+		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
+				       WM8400_DC1_ACTIVE);
+
+	case REGULATOR_MODE_IDLE:
+		/* Datasheet: standby */
+		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+				      WM8400_DC1_ACTIVE, 0);
+		if (ret != 0)
+			return ret;
+		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
+				       WM8400_DC1_SLEEP, 0);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
+						 int input_uV, int output_uV,
+						 int load_uA)
+{
+	return REGULATOR_MODE_NORMAL;
+}
+
+static struct regulator_ops wm8400_dcdc_ops = {
+	.is_enabled = wm8400_dcdc_is_enabled,
+	.enable = wm8400_dcdc_enable,
+	.disable = wm8400_dcdc_disable,
+	.get_voltage = wm8400_dcdc_get_voltage,
+	.set_voltage = wm8400_dcdc_set_voltage,
+	.get_mode = wm8400_dcdc_get_mode,
+	.set_mode = wm8400_dcdc_set_mode,
+	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
+};
+
+static struct regulator_desc regulators[] = {
+	{
+		.name = "LDO1",
+		.id = WM8400_LDO1,
+		.ops = &wm8400_ldo_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO2",
+		.id = WM8400_LDO2,
+		.ops = &wm8400_ldo_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO3",
+		.id = WM8400_LDO3,
+		.ops = &wm8400_ldo_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO4",
+		.id = WM8400_LDO4,
+		.ops = &wm8400_ldo_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC1",
+		.id = WM8400_DCDC1,
+		.ops = &wm8400_dcdc_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC2",
+		.id = WM8400_DCDC2,
+		.ops = &wm8400_dcdc_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init wm8400_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev;
+
+	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
+		pdev->dev.driver_data);
+
+	if (IS_ERR(rdev))
+		return PTR_ERR(rdev);
+
+	return 0;
+}
+
+static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+	regulator_unregister(rdev);
+
+	return 0;
+}
+
+static struct platform_driver wm8400_regulator_driver = {
+	.driver = {
+		.name = "wm8400-regulator",
+	},
+	.probe = wm8400_regulator_probe,
+	.remove = __devexit_p(wm8400_regulator_remove),
+};
+
+/**
+ * wm8400_register_regulator - enable software control of a WM8400 regulator
+ *
+ * This function enables software control of a WM8400 regulator via
+ * the regulator API.  It is intended to be called from the
+ * platform_init() callback of the WM8400 MFD driver.
+ *
+ * @param dev      The WM8400 device to operate on.
+ * @param reg      The regulator to control.
+ * @param initdata Regulator initdata for the regulator.
+ */
+int wm8400_register_regulator(struct device *dev, int reg,
+			      struct regulator_init_data *initdata)
+{
+	struct wm8400 *wm8400 = dev->driver_data;
+
+	if (wm8400->regulators[reg].name)
+		return -EBUSY;
+
+	initdata->driver_data = wm8400;
+
+	wm8400->regulators[reg].name = "wm8400-regulator";
+	wm8400->regulators[reg].id = reg;
+	wm8400->regulators[reg].dev.parent = dev;
+	wm8400->regulators[reg].dev.driver_data = wm8400;
+	wm8400->regulators[reg].dev.platform_data = initdata;
+
+	return platform_device_register(&wm8400->regulators[reg]);
+}
+EXPORT_SYMBOL_GPL(wm8400_register_regulator);
+
+static int __init wm8400_regulator_init(void)
+{
+	return platform_driver_register(&wm8400_regulator_driver);
+}
+module_init(wm8400_regulator_init);
+
+static void __exit wm8400_regulator_exit(void)
+{
+	platform_driver_unregister(&wm8400_regulator_driver);
+}
+module_exit(wm8400_regulator_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM8400 regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8400-regulator");