mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 08:53:41 +00:00
db13c04002
Force to enable i2c as power up/down sequence. Otherwise, SD/LDO can't be enabled or disabled via accessing i2c bus. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Cc: Liam Girdwood <lrg@slimlogic.co.uk> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
315 lines
8.3 KiB
C
315 lines
8.3 KiB
C
/*
|
|
* 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/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 SD & LDO control registers */
|
|
#define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */
|
|
#define OUT_DISABLE 0x1e /* Power U/D sequence as 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_bit;
|
|
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,
|
|
OUT_ENABLE << info->enable_bit,
|
|
OUT_ENABLE << info->enable_bit);
|
|
}
|
|
|
|
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,
|
|
OUT_ENABLE << info->enable_bit,
|
|
OUT_DISABLE << info->enable_bit);
|
|
}
|
|
|
|
static int max8925_is_enabled(struct regulator_dev *rdev)
|
|
{
|
|
struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
|
|
int ret;
|
|
|
|
ret = max8925_reg_read(info->i2c, info->enable_reg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ret & (1 << info->enable_bit);
|
|
}
|
|
|
|
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, \
|
|
.enable_bit = 0, \
|
|
}
|
|
|
|
#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, \
|
|
.enable_bit = 0, \
|
|
}
|
|
|
|
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);
|
|
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");
|
|
|