drivers/regulator/wm8994-regulator.c - kernel/skids - Git at Google

 /*
  * wm8994-regulator.c  --  Regulator driver for the WM8994
  *
  * Copyright 2009 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/gpio.h>
 #include <linux/slab.h>

 #include <linux/mfd/wm8994/core.h>
 #include <linux/mfd/wm8994/registers.h>
 #include <linux/mfd/wm8994/pdata.h>

 struct wm8994_ldo {
 	int enable;
 	bool is_enabled;
 	struct regulator_dev *regulator;
 	struct wm8994 *wm8994;
 };

 #define WM8994_LDO1_MAX_SELECTOR 0x7
 #define WM8994_LDO2_MAX_SELECTOR 0x3

 static int wm8994_ldo_enable(struct regulator_dev *rdev)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

 	/* If we have no soft control assume that the LDO is always enabled. */
 	if (!ldo->enable)
 		return 0;

 	gpio_set_value(ldo->enable, 1);
 	ldo->is_enabled = true;

 	return 0;
 }

 static int wm8994_ldo_disable(struct regulator_dev *rdev)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

 	/* If we have no soft control assume that the LDO is always enabled. */
 	if (!ldo->enable)
 		return -EINVAL;

 	gpio_set_value(ldo->enable, 0);
 	ldo->is_enabled = false;

 	return 0;
 }

 static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

 	return ldo->is_enabled;
 }

 static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
 {
 	/* 3ms is fairly conservative but this shouldn't be too performance
 	 * critical; can be tweaked per-system if required. */
 	return 3000;
 }

 static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
 				    unsigned int selector)
 {
 	if (selector > WM8994_LDO1_MAX_SELECTOR)
 		return -EINVAL;

 	return (selector * 100000) + 2400000;
 }

 static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
 	int val;

 	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
 	if (val < 0)
 		return val;

 	val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;

 	return wm8994_ldo1_list_voltage(rdev, val);
 }

 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
 				   int min_uV, int max_uV)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
 	int selector, v;

 	selector = (min_uV - 2400000) / 100000;
 	v = wm8994_ldo1_list_voltage(rdev, selector);
 	if (v < 0 || v > max_uV)
 		return -EINVAL;

 	selector <<= WM8994_LDO1_VSEL_SHIFT;

 	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
 			       WM8994_LDO1_VSEL_MASK, selector);
 }

 static struct regulator_ops wm8994_ldo1_ops = {
 	.enable = wm8994_ldo_enable,
 	.disable = wm8994_ldo_disable,
 	.is_enabled = wm8994_ldo_is_enabled,
 	.enable_time = wm8994_ldo_enable_time,

 	.list_voltage = wm8994_ldo1_list_voltage,
 	.get_voltage = wm8994_ldo1_get_voltage,
 	.set_voltage = wm8994_ldo1_set_voltage,
 };

 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
 				    unsigned int selector)
 {
 	if (selector > WM8994_LDO2_MAX_SELECTOR)
 		return -EINVAL;

 	return (selector * 100000) + 900000;
 }

 static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
 	int val;

 	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
 	if (val < 0)
 		return val;

 	val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;

 	return wm8994_ldo2_list_voltage(rdev, val);
 }

 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
 				   int min_uV, int max_uV)
 {
 	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
 	int selector, v;

 	selector = (min_uV - 900000) / 100000;
 	v = wm8994_ldo2_list_voltage(rdev, selector);
 	if (v < 0 || v > max_uV)
 		return -EINVAL;

 	selector <<= WM8994_LDO2_VSEL_SHIFT;

 	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
 			       WM8994_LDO2_VSEL_MASK, selector);
 }

 static struct regulator_ops wm8994_ldo2_ops = {
 	.enable = wm8994_ldo_enable,
 	.disable = wm8994_ldo_disable,
 	.is_enabled = wm8994_ldo_is_enabled,
 	.enable_time = wm8994_ldo_enable_time,

 	.list_voltage = wm8994_ldo2_list_voltage,
 	.get_voltage = wm8994_ldo2_get_voltage,
 	.set_voltage = wm8994_ldo2_set_voltage,
 };

 static struct regulator_desc wm8994_ldo_desc[] = {
 	{
 		.name = "LDO1",
 		.id = 1,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
 		.ops = &wm8994_ldo1_ops,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "LDO2",
 		.id = 2,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
 		.ops = &wm8994_ldo2_ops,
 		.owner = THIS_MODULE,
 	},
 };

 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
 {
 	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 	struct wm8994_ldo *ldo;
 	int ret;

 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

 	if (!pdata)
 		return -ENODEV;

 	ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
 	if (ldo == NULL) {
 		dev_err(&pdev->dev, "Unable to allocate private data\n");
 		return -ENOMEM;
 	}

 	ldo->wm8994 = wm8994;

 	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
 		ldo->enable = pdata->ldo[id].enable;

 		ret = gpio_request(ldo->enable, "WM8994 LDO enable");
 		if (ret < 0) {
 			dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
 				ret);
 			goto err;
 		}

 		ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
 				ret);
 			goto err_gpio;
 		}
 	} else
 		ldo->is_enabled = true;

 	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
 					     pdata->ldo[id].init_data, ldo);
 	if (IS_ERR(ldo->regulator)) {
 		ret = PTR_ERR(ldo->regulator);
 		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
 			id + 1, ret);
 		goto err_gpio;
 	}

 	platform_set_drvdata(pdev, ldo);

 	return 0;

 err_gpio:
 	if (gpio_is_valid(ldo->enable))
 		gpio_free(ldo->enable);
 err:
 	kfree(ldo);
 	return ret;
 }

 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
 {
 	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);

 	platform_set_drvdata(pdev, NULL);

 	regulator_unregister(ldo->regulator);
 	if (gpio_is_valid(ldo->enable))
 		gpio_free(ldo->enable);
 	kfree(ldo);

 	return 0;
 }

 static struct platform_driver wm8994_ldo_driver = {
 	.probe = wm8994_ldo_probe,
 	.remove = __devexit_p(wm8994_ldo_remove),
 	.driver		= {
 		.name	= "wm8994-ldo",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init wm8994_ldo_init(void)
 {
 	int ret;

 	ret = platform_driver_register(&wm8994_ldo_driver);
 	if (ret != 0)
 		pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);

 	return ret;
 }
 subsys_initcall(wm8994_ldo_init);

 static void __exit wm8994_ldo_exit(void)
 {
 	platform_driver_unregister(&wm8994_ldo_driver);
 }
 module_exit(wm8994_ldo_exit);

 /* Module information */
 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_DESCRIPTION("WM8994 LDO driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:wm8994-ldo");
	/*
	* wm8994-regulator.c -- Regulator driver for the WM8994
	*
	* Copyright 2009 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/gpio.h>
	#include <linux/slab.h>

	#include <linux/mfd/wm8994/core.h>
	#include <linux/mfd/wm8994/registers.h>
	#include <linux/mfd/wm8994/pdata.h>

	struct wm8994_ldo {
	int enable;
	bool is_enabled;
	struct regulator_dev *regulator;
	struct wm8994 *wm8994;
	};

	#define WM8994_LDO1_MAX_SELECTOR 0x7
	#define WM8994_LDO2_MAX_SELECTOR 0x3

	static int wm8994_ldo_enable(struct regulator_dev *rdev)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	/* If we have no soft control assume that the LDO is always enabled. */
	if (!ldo->enable)
	return 0;

	gpio_set_value(ldo->enable, 1);
	ldo->is_enabled = true;

	return 0;
	}

	static int wm8994_ldo_disable(struct regulator_dev *rdev)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	/* If we have no soft control assume that the LDO is always enabled. */
	if (!ldo->enable)
	return -EINVAL;

	gpio_set_value(ldo->enable, 0);
	ldo->is_enabled = false;

	return 0;
	}

	static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	return ldo->is_enabled;
	}

	static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
	{
	/* 3ms is fairly conservative but this shouldn't be too performance
	* critical; can be tweaked per-system if required. */
	return 3000;
	}

	static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
	unsigned int selector)
	{
	if (selector > WM8994_LDO1_MAX_SELECTOR)
	return -EINVAL;

	return (selector * 100000) + 2400000;
	}

	static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int val;

	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
	if (val < 0)
	return val;

	val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;

	return wm8994_ldo1_list_voltage(rdev, val);
	}

	static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int selector, v;

	selector = (min_uV - 2400000) / 100000;
	v = wm8994_ldo1_list_voltage(rdev, selector);
	if (v < 0 \|\| v > max_uV)
	return -EINVAL;

	selector <<= WM8994_LDO1_VSEL_SHIFT;

	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
	WM8994_LDO1_VSEL_MASK, selector);
	}

	static struct regulator_ops wm8994_ldo1_ops = {
	.enable = wm8994_ldo_enable,
	.disable = wm8994_ldo_disable,
	.is_enabled = wm8994_ldo_is_enabled,
	.enable_time = wm8994_ldo_enable_time,

	.list_voltage = wm8994_ldo1_list_voltage,
	.get_voltage = wm8994_ldo1_get_voltage,
	.set_voltage = wm8994_ldo1_set_voltage,
	};

	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
	unsigned int selector)
	{
	if (selector > WM8994_LDO2_MAX_SELECTOR)
	return -EINVAL;

	return (selector * 100000) + 900000;
	}

	static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int val;

	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
	if (val < 0)
	return val;

	val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;

	return wm8994_ldo2_list_voltage(rdev, val);
	}

	static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV)
	{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int selector, v;

	selector = (min_uV - 900000) / 100000;
	v = wm8994_ldo2_list_voltage(rdev, selector);
	if (v < 0 \|\| v > max_uV)
	return -EINVAL;

	selector <<= WM8994_LDO2_VSEL_SHIFT;

	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
	WM8994_LDO2_VSEL_MASK, selector);
	}

	static struct regulator_ops wm8994_ldo2_ops = {
	.enable = wm8994_ldo_enable,
	.disable = wm8994_ldo_disable,
	.is_enabled = wm8994_ldo_is_enabled,
	.enable_time = wm8994_ldo_enable_time,

	.list_voltage = wm8994_ldo2_list_voltage,
	.get_voltage = wm8994_ldo2_get_voltage,
	.set_voltage = wm8994_ldo2_set_voltage,
	};

	static struct regulator_desc wm8994_ldo_desc[] = {
	{
	.name = "LDO1",
	.id = 1,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
	.ops = &wm8994_ldo1_ops,
	.owner = THIS_MODULE,
	},
	{
	.name = "LDO2",
	.id = 2,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
	.ops = &wm8994_ldo2_ops,
	.owner = THIS_MODULE,
	},
	};

	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
	{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	struct wm8994_ldo *ldo;
	int ret;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	if (!pdata)
	return -ENODEV;

	ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
	if (ldo == NULL) {
	dev_err(&pdev->dev, "Unable to allocate private data\n");
	return -ENOMEM;
	}

	ldo->wm8994 = wm8994;

	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	ldo->enable = pdata->ldo[id].enable;

	ret = gpio_request(ldo->enable, "WM8994 LDO enable");
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	ret);
	goto err;
	}

	ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
	ret);
	goto err_gpio;
	}
	} else
	ldo->is_enabled = true;

	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
	pdata->ldo[id].init_data, ldo);
	if (IS_ERR(ldo->regulator)) {
	ret = PTR_ERR(ldo->regulator);
	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	id + 1, ret);
	goto err_gpio;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

	err_gpio:
	if (gpio_is_valid(ldo->enable))
	gpio_free(ldo->enable);
	err:
	kfree(ldo);
	return ret;
	}

	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	{
	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	regulator_unregister(ldo->regulator);
	if (gpio_is_valid(ldo->enable))
	gpio_free(ldo->enable);
	kfree(ldo);

	return 0;
	}

	static struct platform_driver wm8994_ldo_driver = {
	.probe = wm8994_ldo_probe,
	.remove = __devexit_p(wm8994_ldo_remove),
	.driver = {
	.name = "wm8994-ldo",
	.owner = THIS_MODULE,
	},
	};

	static int __init wm8994_ldo_init(void)
	{
	int ret;

	ret = platform_driver_register(&wm8994_ldo_driver);
	if (ret != 0)
	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);

	return ret;
	}
	subsys_initcall(wm8994_ldo_init);

	static void __exit wm8994_ldo_exit(void)
	{
	platform_driver_unregister(&wm8994_ldo_driver);
	}
	module_exit(wm8994_ldo_exit);

	/* Module information */
	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_DESCRIPTION("WM8994 LDO driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:wm8994-ldo");