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linux-pinenote/drivers/regulator/max8925-regulator.c
Kevin Liu 65364e9ab9 regulator: max8925: fix enabled/disabled judgement mistake 
Max8925 ldo status should be determined by two factors:
1. power up/down sequence selection(LDOCTL[4:2]).
2. i2c enable bit(LDOCTL[0]).

Max8925 ldo support two types of power up/down sequence:
1. flexible sequence(LDOCTL[4:2] = 0~6).
2. i2c sequence(LDOCTL[4:2] = 7).

With flexible sequence selected, the ldo is enabled during power up by default.
With i2c sequence selected, the ldo is controlled by the i2c enable bit(LDOCTL[0]).

Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-01-06 10:56:14 -08:00

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/*
* Regulators driver for Maxim max8925
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max8925.h>
#define SD1_DVM_VMIN 850000
#define SD1_DVM_VMAX 1000000
#define SD1_DVM_STEP 50000
#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
#define SD1_DVM_EN 6 /* SDV1 bit 6 */
/* bit definitions in LDO control registers */
#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
#define LDO_I2C_EN 0x1 /* Enable by i2c */
#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
struct max8925_regulator_info {
struct regulator_desc desc;
struct regulator_dev *regulator;
struct i2c_client *i2c;
struct max8925_chip *chip;
int min_uV;
int max_uV;
int step_uV;
int vol_reg;
int vol_shift;
int vol_nbits;
int enable_reg;
};
static inline int check_range(struct max8925_regulator_info *info,
int min_uV, int max_uV)
{
if (min_uV < info->min_uV || min_uV > info->max_uV)
return -EINVAL;
return 0;
}
static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
return info->min_uV + index * info->step_uV;
}
static int max8925_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned int *selector)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
unsigned char data, mask;
if (check_range(info, min_uV, max_uV)) {
dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
min_uV, max_uV);
return -EINVAL;
}
data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
*selector = data;
data <<= info->vol_shift;
mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
}
static int max8925_get_voltage(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
unsigned char data, mask;
int ret;
ret = max8925_reg_read(info->i2c, info->vol_reg);
if (ret < 0)
return ret;
mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
data = (ret & mask) >> info->vol_shift;
return max8925_list_voltage(rdev, data);
}
static int max8925_enable(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
return max8925_set_bits(info->i2c, info->enable_reg,
LDO_SEQ_MASK << LDO_SEQ_SHIFT |
LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
LDO_SEQ_I2C << LDO_SEQ_SHIFT |
LDO_I2C_EN << LDO_I2C_EN_SHIFT);
}
static int max8925_disable(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
return max8925_set_bits(info->i2c, info->enable_reg,
LDO_SEQ_MASK << LDO_SEQ_SHIFT |
LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
LDO_SEQ_I2C << LDO_SEQ_SHIFT);
}
static int max8925_is_enabled(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
int ldo_seq, ret;
ret = max8925_reg_read(info->i2c, info->enable_reg);
if (ret < 0)
return ret;
ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
if (ldo_seq != LDO_SEQ_I2C)
return 1;
else
return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
}
static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
unsigned char data, mask;
if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
return -EINVAL;
data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
data <<= SD1_DVM_SHIFT;
mask = 3 << SD1_DVM_SHIFT;
return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
}
static int max8925_set_dvm_enable(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
1 << SD1_DVM_EN);
}
static int max8925_set_dvm_disable(struct regulator_dev *rdev)
{
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
}
static struct regulator_ops max8925_regulator_sdv_ops = {
.set_voltage = max8925_set_voltage,
.get_voltage = max8925_get_voltage,
.enable = max8925_enable,
.disable = max8925_disable,
.is_enabled = max8925_is_enabled,
.set_suspend_voltage = max8925_set_dvm_voltage,
.set_suspend_enable = max8925_set_dvm_enable,
.set_suspend_disable = max8925_set_dvm_disable,
};
static struct regulator_ops max8925_regulator_ldo_ops = {
.set_voltage = max8925_set_voltage,
.get_voltage = max8925_get_voltage,
.enable = max8925_enable,
.disable = max8925_disable,
.is_enabled = max8925_is_enabled,
};
#define MAX8925_SDV(_id, min, max, step) \
{ \
.desc = { \
.name = "SDV" #_id, \
.ops = &max8925_regulator_sdv_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MAX8925_ID_SD##_id, \
.owner = THIS_MODULE, \
}, \
.min_uV = min * 1000, \
.max_uV = max * 1000, \
.step_uV = step * 1000, \
.vol_reg = MAX8925_SDV##_id, \
.vol_shift = 0, \
.vol_nbits = 6, \
.enable_reg = MAX8925_SDCTL##_id, \
}
#define MAX8925_LDO(_id, min, max, step) \
{ \
.desc = { \
.name = "LDO" #_id, \
.ops = &max8925_regulator_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MAX8925_ID_LDO##_id, \
.owner = THIS_MODULE, \
}, \
.min_uV = min * 1000, \
.max_uV = max * 1000, \
.step_uV = step * 1000, \
.vol_reg = MAX8925_LDOVOUT##_id, \
.vol_shift = 0, \
.vol_nbits = 6, \
.enable_reg = MAX8925_LDOCTL##_id, \
}
static struct max8925_regulator_info max8925_regulator_info[] = {
MAX8925_SDV(1, 637.5, 1425, 12.5),
MAX8925_SDV(2, 650, 2225, 25),
MAX8925_SDV(3, 750, 3900, 50),
MAX8925_LDO(1, 750, 3900, 50),
MAX8925_LDO(2, 650, 2250, 25),
MAX8925_LDO(3, 650, 2250, 25),
MAX8925_LDO(4, 750, 3900, 50),
MAX8925_LDO(5, 750, 3900, 50),
MAX8925_LDO(6, 750, 3900, 50),
MAX8925_LDO(7, 750, 3900, 50),
MAX8925_LDO(8, 750, 3900, 50),
MAX8925_LDO(9, 750, 3900, 50),
MAX8925_LDO(10, 750, 3900, 50),
MAX8925_LDO(11, 750, 3900, 50),
MAX8925_LDO(12, 750, 3900, 50),
MAX8925_LDO(13, 750, 3900, 50),
MAX8925_LDO(14, 750, 3900, 50),
MAX8925_LDO(15, 750, 3900, 50),
MAX8925_LDO(16, 750, 3900, 50),
MAX8925_LDO(17, 650, 2250, 25),
MAX8925_LDO(18, 650, 2250, 25),
MAX8925_LDO(19, 750, 3900, 50),
MAX8925_LDO(20, 750, 3900, 50),
};
static struct max8925_regulator_info * __devinit find_regulator_info(int id)
{
struct max8925_regulator_info *ri;
int i;
for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
ri = &max8925_regulator_info[i];
if (ri->desc.id == id)
return ri;
}
return NULL;
}
static int __devinit max8925_regulator_probe(struct platform_device *pdev)
{
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct max8925_platform_data *pdata = chip->dev->platform_data;
struct max8925_regulator_info *ri;
struct regulator_dev *rdev;
ri = find_regulator_info(pdev->id);
if (ri == NULL) {
dev_err(&pdev->dev, "invalid regulator ID specified\n");
return -EINVAL;
}
ri->i2c = chip->i2c;
ri->chip = chip;
rdev = regulator_register(&ri->desc, &pdev->dev,
pdata->regulator[pdev->id], ri, NULL);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc.name);
return PTR_ERR(rdev);
}
platform_set_drvdata(pdev, rdev);
return 0;
}
static int __devexit max8925_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
regulator_unregister(rdev);
return 0;
}
static struct platform_driver max8925_regulator_driver = {
.driver = {
.name = "max8925-regulator",
.owner = THIS_MODULE,
},
.probe = max8925_regulator_probe,
.remove = __devexit_p(max8925_regulator_remove),
};
static int __init max8925_regulator_init(void)
{
return platform_driver_register(&max8925_regulator_driver);
}
subsys_initcall(max8925_regulator_init);
static void __exit max8925_regulator_exit(void)
{
platform_driver_unregister(&max8925_regulator_driver);
}
module_exit(max8925_regulator_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
MODULE_ALIAS("platform:max8925-regulator");
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