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linux-next/drivers/regulator/88pm8607.c
Mark Brown ddec68107a regulator: Ensure val is initialised in 88pm8607 choose_voltage() 
If we fall through it means that we hit an unknown regulator/chip
combination so set -ENOENT as an explicit flag (the return code
is only used internally).

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2009-12-17 10:27:25 +00:00

686 lines
17 KiB
C
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/*
* Regulators driver for Marvell 88PM8607
*
* 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/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/88pm8607.h>
struct pm8607_regulator_info {
struct regulator_desc desc;
struct pm8607_chip *chip;
struct regulator_dev *regulator;
int min_uV;
int max_uV;
int step_uV;
int vol_reg;
int vol_shift;
int vol_nbits;
int update_reg;
int update_bit;
int enable_reg;
int enable_bit;
int slope_double;
};
static inline int check_range(struct pm8607_regulator_info *info,
int min_uV, int max_uV)
{
if (max_uV < info->min_uV || min_uV > info->max_uV || min_uV > max_uV)
return -EINVAL;
return 0;
}
static int pm8607_list_voltage(struct regulator_dev *rdev, unsigned index)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
uint8_t chip_id = info->chip->chip_id;
int ret = -EINVAL;
switch (info->desc.id) {
case PM8607_ID_BUCK1:
ret = (index < 0x1d) ? (index * 25000 + 800000) :
((index < 0x20) ? 1500000 :
((index < 0x40) ? ((index - 0x20) * 25000) :
-EINVAL));
break;
case PM8607_ID_BUCK3:
ret = (index < 0x3d) ? (index * 25000) :
((index < 0x40) ? 1500000 : -EINVAL);
if (ret < 0)
break;
if (info->slope_double)
ret <<= 1;
break;
case PM8607_ID_LDO1:
ret = (index == 0) ? 1800000 :
((index == 1) ? 1200000 :
((index == 2) ? 2800000 : -EINVAL));
break;
case PM8607_ID_LDO5:
ret = (index == 0) ? 2900000 :
((index == 1) ? 3000000 :
((index == 2) ? 3100000 : 3300000));
break;
case PM8607_ID_LDO7:
case PM8607_ID_LDO8:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2550000) :
-EINVAL);
break;
case PM8607_ID_LDO12:
ret = (index < 2) ? (index * 100000 + 1800000) :
((index < 7) ? (index * 100000 + 2500000) :
((index == 7) ? 3300000 : 1200000));
break;
case PM8607_ID_LDO2:
case PM8607_ID_LDO3:
case PM8607_ID_LDO9:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2550000) :
-EINVAL);
break;
case PM8607_CHIP_B0:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 7) ? (index * 50000 + 2550000) :
3300000);
break;
}
break;
case PM8607_ID_LDO4:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2550000) :
-EINVAL);
break;
case PM8607_CHIP_B0:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 6) ? (index * 50000 + 2550000) :
((index == 6) ? 2900000 : 3300000));
break;
}
break;
case PM8607_ID_LDO6:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2450000) :
-EINVAL);
break;
case PM8607_CHIP_B0:
ret = (index < 2) ? (index * 50000 + 1800000) :
((index < 7) ? (index * 50000 + 2500000) :
3300000);
break;
}
break;
case PM8607_ID_LDO10:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2550000) :
1200000);
break;
case PM8607_CHIP_B0:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 7) ? (index * 50000 + 2550000) :
((index == 7) ? 3300000 : 1200000));
break;
}
break;
case PM8607_ID_LDO14:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
ret = (index < 3) ? (index * 50000 + 1800000) :
((index < 8) ? (index * 50000 + 2550000) :
-EINVAL);
break;
case PM8607_CHIP_B0:
ret = (index < 2) ? (index * 50000 + 1800000) :
((index < 7) ? (index * 50000 + 2600000) :
3300000);
break;
}
break;
}
return ret;
}
static int choose_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
uint8_t chip_id = info->chip->chip_id;
int val = -ENOENT;
int ret;
switch (info->desc.id) {
case PM8607_ID_BUCK1:
if (min_uV >= 800000) /* 800mV ~ 1500mV / 25mV */
val = (min_uV - 775001) / 25000;
else { /* 25mV ~ 775mV / 25mV */
val = (min_uV + 249999) / 25000;
val += 32;
}
break;
case PM8607_ID_BUCK3:
if (info->slope_double)
min_uV = min_uV >> 1;
val = (min_uV + 249999) / 25000; /* 0mV ~ 1500mV / 25mV */
break;
case PM8607_ID_LDO1:
if (min_uV > 1800000)
val = 2;
else if (min_uV > 1200000)
val = 0;
else
val = 1;
break;
case PM8607_ID_LDO5:
if (min_uV > 3100000)
val = 3;
else /* 2900mV ~ 3100mV / 100mV */
val = (min_uV - 2800001) / 100000;
break;
case PM8607_ID_LDO7:
case PM8607_ID_LDO8:
if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0; /* 1800mv */
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
} else { /* 2700mV ~ 2900mV / 50mV */
if (min_uV <= 2900000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else
val = -EINVAL;
}
break;
case PM8607_ID_LDO10:
if (min_uV > 2850000)
val = 7;
else if (min_uV <= 1200000)
val = 8;
else if (min_uV < 2700000) /* 1800mV ~ 1900mV / 50mV */
val = (min_uV - 1750001) / 50000;
else { /* 2700mV ~ 2850mV / 50mV */
val = (min_uV - 2650001) / 50000;
val += 3;
}
break;
case PM8607_ID_LDO12:
if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 100mV */
if (min_uV <= 1200000)
val = 8; /* 1200mV */
else if (min_uV <= 1800000)
val = 0; /* 1800mV */
else if (min_uV <= 1900000)
val = (min_uV - 1700001) / 100000;
else
val = 2; /* 2700mV */
} else { /* 2700mV ~ 3100mV / 100mV */
if (min_uV <= 3100000) {
val = (min_uV - 2600001) / 100000;
val += 2;
} else if (min_uV <= 3300000)
val = 7;
else
val = -EINVAL;
}
break;
case PM8607_ID_LDO2:
case PM8607_ID_LDO3:
case PM8607_ID_LDO9:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
if (min_uV < 2700000) /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
else { /* 2700mV ~ 2900mV / 50mV */
if (min_uV <= 2900000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else
val = -EINVAL;
}
break;
case PM8607_CHIP_B0:
if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
} else { /* 2700mV ~ 2850mV / 50mV */
if (min_uV <= 2850000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else if (min_uV <= 3300000)
val = 7;
else
val = -EINVAL;
}
break;
}
break;
case PM8607_ID_LDO4:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
if (min_uV < 2700000) /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
else { /* 2700mV ~ 2900mV / 50mV */
if (min_uV <= 2900000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else
val = -EINVAL;
}
break;
case PM8607_CHIP_B0:
if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
} else { /* 2700mV ~ 2800mV / 50mV */
if (min_uV <= 2850000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else if (min_uV <= 2900000)
val = 6;
else if (min_uV <= 3300000)
val = 7;
else
val = -EINVAL;
}
break;
}
break;
case PM8607_ID_LDO6:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
if (min_uV < 2600000) { /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2600mV */
} else { /* 2600mV ~ 2800mV / 50mV */
if (min_uV <= 2800000) {
val = (min_uV - 2550001) / 50000;
val += 3;
} else
val = -EINVAL;
}
break;
case PM8607_CHIP_B0:
if (min_uV < 2600000) { /* 1800mV ~ 1850mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1850000)
val = (min_uV - 1750001) / 50000;
else
val = 2; /* 2600mV */
} else { /* 2600mV ~ 2800mV / 50mV */
if (min_uV <= 2800000) {
val = (min_uV - 2550001) / 50000;
val += 2;
} else if (min_uV <= 3300000)
val = 7;
else
val = -EINVAL;
}
break;
}
break;
case PM8607_ID_LDO14:
switch (chip_id) {
case PM8607_CHIP_A0:
case PM8607_CHIP_A1:
if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1900000)
val = (min_uV - 1750001) / 50000;
else
val = 3; /* 2700mV */
} else { /* 2700mV ~ 2900mV / 50mV */
if (min_uV <= 2900000) {
val = (min_uV - 2650001) / 50000;
val += 3;
} else
val = -EINVAL;
}
break;
case PM8607_CHIP_B0:
if (min_uV < 2700000) { /* 1800mV ~ 1850mV / 50mV */
if (min_uV <= 1800000)
val = 0;
else if (min_uV <= 1850000)
val = (min_uV - 1750001) / 50000;
else
val = 2; /* 2700mV */
} else { /* 2700mV ~ 2900mV / 50mV */
if (min_uV <= 2900000) {
val = (min_uV - 2650001) / 50000;
val += 2;
} else if (min_uV <= 3300000)
val = 7;
else
val = -EINVAL;
}
break;
}
break;
}
if (val >= 0) {
ret = pm8607_list_voltage(rdev, val);
if (ret > max_uV) {
pr_err("exceed voltage range (%d %d) uV",
min_uV, max_uV);
return -EINVAL;
}
} else
pr_err("invalid voltage range (%d %d) uV", min_uV, max_uV);
return val;
}
static int pm8607_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
struct pm8607_chip *chip = info->chip;
uint8_t val, mask;
int ret;
if (check_range(info, min_uV, max_uV)) {
pr_err("invalid voltage range (%d, %d) uV\n", min_uV, max_uV);
return -EINVAL;
}
ret = choose_voltage(rdev, min_uV, max_uV);
if (ret < 0)
return -EINVAL;
val = (uint8_t)(ret << info->vol_shift);
mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
ret = pm8607_set_bits(chip, info->vol_reg, mask, val);
if (ret)
return ret;
switch (info->desc.id) {
case PM8607_ID_BUCK1:
case PM8607_ID_BUCK3:
ret = pm8607_set_bits(chip, info->update_reg,
1 << info->update_bit,
1 << info->update_bit);
break;
}
return ret;
}
static int pm8607_get_voltage(struct regulator_dev *rdev)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
struct pm8607_chip *chip = info->chip;
uint8_t val, mask;
int ret;
ret = pm8607_reg_read(chip, info->vol_reg);
if (ret < 0)
return ret;
mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
val = ((unsigned char)ret & mask) >> info->vol_shift;
return pm8607_list_voltage(rdev, val);
}
static int pm8607_enable(struct regulator_dev *rdev)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
struct pm8607_chip *chip = info->chip;
return pm8607_set_bits(chip, info->enable_reg,
1 << info->enable_bit,
1 << info->enable_bit);
}
static int pm8607_disable(struct regulator_dev *rdev)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
struct pm8607_chip *chip = info->chip;
return pm8607_set_bits(chip, info->enable_reg,
1 << info->enable_bit, 0);
}
static int pm8607_is_enabled(struct regulator_dev *rdev)
{
struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
struct pm8607_chip *chip = info->chip;
int ret;
ret = pm8607_reg_read(chip, info->enable_reg);
if (ret < 0)
return ret;
return !!((unsigned char)ret & (1 << info->enable_bit));
}
static struct regulator_ops pm8607_regulator_ops = {
.set_voltage = pm8607_set_voltage,
.get_voltage = pm8607_get_voltage,
.enable = pm8607_enable,
.disable = pm8607_disable,
.is_enabled = pm8607_is_enabled,
};
#define PM8607_DVC(_id, min, max, step, vreg, nbits, ureg, ubit, ereg, ebit) \
{ \
.desc = { \
.name = "BUCK" #_id, \
.ops = &pm8607_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = PM8607_ID_BUCK##_id, \
.owner = THIS_MODULE, \
}, \
.min_uV = (min) * 1000, \
.max_uV = (max) * 1000, \
.step_uV = (step) * 1000, \
.vol_reg = PM8607_##vreg, \
.vol_shift = (0), \
.vol_nbits = (nbits), \
.update_reg = PM8607_##ureg, \
.update_bit = (ubit), \
.enable_reg = PM8607_##ereg, \
.enable_bit = (ebit), \
.slope_double = (0), \
}
#define PM8607_LDO(_id, min, max, step, vreg, shift, nbits, ereg, ebit) \
{ \
.desc = { \
.name = "LDO" #_id, \
.ops = &pm8607_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = PM8607_ID_LDO##_id, \
.owner = THIS_MODULE, \
}, \
.min_uV = (min) * 1000, \
.max_uV = (max) * 1000, \
.step_uV = (step) * 1000, \
.vol_reg = PM8607_##vreg, \
.vol_shift = (shift), \
.vol_nbits = (nbits), \
.enable_reg = PM8607_##ereg, \
.enable_bit = (ebit), \
.slope_double = (0), \
}
static struct pm8607_regulator_info pm8607_regulator_info[] = {
PM8607_DVC(1, 0, 1500, 25, BUCK1, 6, GO, 0, SUPPLIES_EN11, 0),
PM8607_DVC(3, 0, 1500, 25, BUCK3, 6, GO, 2, SUPPLIES_EN11, 2),
PM8607_LDO(1 , 1200, 2800, 0, LDO1 , 0, 2, SUPPLIES_EN11, 3),
PM8607_LDO(2 , 1800, 3300, 0, LDO2 , 0, 3, SUPPLIES_EN11, 4),
PM8607_LDO(3 , 1800, 3300, 0, LDO3 , 0, 3, SUPPLIES_EN11, 5),
PM8607_LDO(4 , 1800, 3300, 0, LDO4 , 0, 3, SUPPLIES_EN11, 6),
PM8607_LDO(5 , 2900, 3300, 0, LDO5 , 0, 2, SUPPLIES_EN11, 7),
PM8607_LDO(6 , 1800, 3300, 0, LDO6 , 0, 3, SUPPLIES_EN12, 0),
PM8607_LDO(7 , 1800, 2900, 0, LDO7 , 0, 3, SUPPLIES_EN12, 1),
PM8607_LDO(8 , 1800, 2900, 0, LDO8 , 0, 3, SUPPLIES_EN12, 2),
PM8607_LDO(9 , 1800, 3300, 0, LDO9 , 0, 3, SUPPLIES_EN12, 3),
PM8607_LDO(10, 1200, 3300, 0, LDO10, 0, 4, SUPPLIES_EN11, 4),
PM8607_LDO(12, 1200, 3300, 0, LDO12, 0, 4, SUPPLIES_EN11, 5),
PM8607_LDO(14, 1800, 3300, 0, LDO14, 0, 3, SUPPLIES_EN11, 6),
};
static inline struct pm8607_regulator_info *find_regulator_info(int id)
{
struct pm8607_regulator_info *info;
int i;
for (i = 0; i < ARRAY_SIZE(pm8607_regulator_info); i++) {
info = &pm8607_regulator_info[i];
if (info->desc.id == id)
return info;
}
return NULL;
}
static int __devinit pm8607_regulator_probe(struct platform_device *pdev)
{
struct pm8607_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm8607_platform_data *pdata = chip->dev->platform_data;
struct pm8607_regulator_info *info = NULL;
info = find_regulator_info(pdev->id);
if (info == NULL) {
dev_err(&pdev->dev, "invalid regulator ID specified\n");
return -EINVAL;
}
info->chip = chip;
info->regulator = regulator_register(&info->desc, &pdev->dev,
pdata->regulator[pdev->id], info);
if (IS_ERR(info->regulator)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
info->desc.name);
return PTR_ERR(info->regulator);
}
/* check DVC ramp slope double */
if (info->desc.id == PM8607_ID_BUCK3)
if (info->chip->buck3_double)
info->slope_double = 1;
platform_set_drvdata(pdev, info);
return 0;
}
static int __devexit pm8607_regulator_remove(struct platform_device *pdev)
{
struct pm8607_regulator_info *info = platform_get_drvdata(pdev);
regulator_unregister(info->regulator);
return 0;
}
#define PM8607_REGULATOR_DRIVER(_name) \
{ \
.driver = { \
.name = "88pm8607-" #_name, \
.owner = THIS_MODULE, \
}, \
.probe = pm8607_regulator_probe, \
.remove = __devexit_p(pm8607_regulator_remove), \
}
static struct platform_driver pm8607_regulator_driver[] = {
PM8607_REGULATOR_DRIVER(buck1),
PM8607_REGULATOR_DRIVER(buck2),
PM8607_REGULATOR_DRIVER(buck3),
PM8607_REGULATOR_DRIVER(ldo1),
PM8607_REGULATOR_DRIVER(ldo2),
PM8607_REGULATOR_DRIVER(ldo3),
PM8607_REGULATOR_DRIVER(ldo4),
PM8607_REGULATOR_DRIVER(ldo5),
PM8607_REGULATOR_DRIVER(ldo6),
PM8607_REGULATOR_DRIVER(ldo7),
PM8607_REGULATOR_DRIVER(ldo8),
PM8607_REGULATOR_DRIVER(ldo9),
PM8607_REGULATOR_DRIVER(ldo10),
PM8607_REGULATOR_DRIVER(ldo12),
PM8607_REGULATOR_DRIVER(ldo14),
};
static int __init pm8607_regulator_init(void)
{
int i, count, ret;
count = ARRAY_SIZE(pm8607_regulator_driver);
for (i = 0; i < count; i++) {
ret = platform_driver_register(&pm8607_regulator_driver[i]);
if (ret != 0)
pr_err("Failed to register regulator driver: %d\n",
ret);
}
return 0;
}
subsys_initcall(pm8607_regulator_init);
static void __exit pm8607_regulator_exit(void)
{
int i, count;
count = ARRAY_SIZE(pm8607_regulator_driver);
for (i = 0; i < count; i++)
platform_driver_unregister(&pm8607_regulator_driver[i]);
}
module_exit(pm8607_regulator_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_DESCRIPTION("Regulator Driver for Marvell 88PM8607 PMIC");
MODULE_ALIAS("platform:88pm8607-regulator");
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