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5dbdf73548
linux-next/drivers/regulator/wm8400-regulator.c
Uwe Kleine-König 5dbdf73548 move wm8400-regulator's probe function to .devinit.text 
A pointer to wm8400_regulator_probe is passed to the core via
platform_driver_register and so the function must not disappear when the
.init sections are discarded.  Otherwise (if also having HOTPLUG=y)
unbinding and binding a device to the driver via sysfs will result in an
oops as does a device being registered late.

An alternative to this patch is using platform_driver_probe instead of
platform_driver_register plus removing the pointer to the probe function
from the struct platform_driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2009-01-17 13:46:40 +00:00

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/*
* 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 __devinit 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");
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