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Commit 69dc16c3 authored by Mark Brown's avatar Mark Brown Committed by Liam Girdwood
Browse files

regulator: Add WM8994 regulator support 



The WM8994 contains two LDOs with mixed hardware/software control to
minimise the number of external supplies required while delivering
optimal voltages to minimise power consumption.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent a71b797f

drivers/regulator/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -111,6 +111,13 @@ config REGULATOR_WM8400 
	  This driver provides support for the voltage regulators of the

	  WM8400 AudioPlus PMIC.



config REGULATOR_WM8994

	tristate "Wolfson Microelectronics WM8994 CODEC"

	depends on MFD_WM8994

	help

	  This driver provides support for the voltage regulators on the

	  WM8994 CODEC.



config REGULATOR_DA903X

	tristate "Support regulators on Dialog Semiconductor DA9030/DA9034 PMIC"

	depends on PMIC_DA903X

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o 
obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o

obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o

obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o

obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o

obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o

obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o

obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o

drivers/regulator/wm8994-regulator.c

0 → 100644
+304 −0
Original line number Diff line number Diff line 
/*

 * 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/mfd/wm8994/core.h>

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

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



struct wm8994_ldo {

	int enable;

	int 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 = 1;



	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 = 0;



	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;



	ldo->is_enabled = 1;



	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;

		}

	}



	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);



	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",

	},

};



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");