--- /dev/null
+/*
+ * 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(®ulators[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");
projects / linux-2.6-omap-h63xx.git / commitdiff