/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
*
* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
*
* AB8500 peripheral regulators
*
* AB8500 supports the following regulators,
* LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT,
* VAUX1/2/3, VANA
*
* for DB8500 cut 1.0 and previous versions of the silicon, all accesses
* to registers are through the DB8500 SPI. In cut 1.1 onwards, these
* accesses are through the DB8500 PRCMU I2C
*
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/ab8500.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/ab8500.h>
/**
* struct ab8500_regulator_info - ab8500 regulator information
* @desc: regulator description
* @ab8500: ab8500 parent
* @regulator_dev: regulator device
* @max_uV: maximum voltage (for variable voltage supplies)
* @min_uV: minimum voltage (for variable voltage supplies)
* @fixed_uV: typical voltage (for fixed voltage supplies)
* @update_reg: register to control on/off
* @mask: mask to enable/disable regulator
* @enable: bits to enable the regulator in normal(high power) mode
* @voltage_reg: register to control regulator voltage
* @voltage_mask: mask to control regulator voltage
* @supported_voltages: supported voltage table
* @voltages_len: number of supported voltages for the regulator
*/
struct ab8500_regulator_info {
struct device *dev;
struct regulator_desc desc;
struct ab8500 *ab8500;
struct regulator_dev *regulator;
int max_uV;
int min_uV;
int fixed_uV;
int update_reg;
int mask;
int enable;
int voltage_reg;
int voltage_mask;
int const *supported_voltages;
int voltages_len;
};
/* voltage tables for the vauxn/vintcore supplies */
static const int ldo_vauxn_voltages[] = {
1100000,
1200000,
1300000,
1400000,
1500000,
1800000,
1850000,
1900000,
2500000,
2650000,
2700000,
2750000,
2800000,
2900000,
3000000,
3300000,
};
static const int ldo_vintcore_voltages[] = {
1200000,
1225000,
1250000,
1275000,
1300000,
1325000,
1350000,
};
static int ab8500_regulator_enable(struct regulator_dev *rdev)
{
int regulator_id, ret;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
ret = ab8500_set_bits(info->ab8500, info->update_reg,
info->mask, info->enable);
if (ret < 0)
dev_err(rdev_get_dev(rdev),
"couldn't set enable bits for regulator\n");
return ret;
}
static int ab8500_regulator_disable(struct regulator_dev *rdev)
{
int regulator_id, ret;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
ret = ab8500_set_bits(info->ab8500, info->update_reg,
info->mask, 0x0);
if (ret < 0)
dev_err(rdev_get_dev(rdev),
"couldn't set disable bits for regulator\n");
return ret;
}
static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
{
int regulator_id, ret;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
ret = ab8500_read(info->ab8500, info->update_reg);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"couldn't read 0x%x register\n", info->update_reg);
return ret;
}
if (ret & info->mask)
return true;
else
return false;
}
static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
{
int regulator_id;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
/* return the uV for the fixed regulators */
if (info->fixed_uV)
return info->fixed_uV;
if (selector > info->voltages_len)
return -EINVAL;
return info->supported_voltages[selector];
}
static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
{
int regulator_id, ret, val;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
ret = ab8500_read(info->ab8500, info->voltage_reg);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"couldn't read voltage reg for regulator\n");
return ret;
}
/* vintcore has a different layout */
val = ret & info->voltage_mask;
if (regulator_id == AB8500_LDO_INTCORE)
ret = info->supported_voltages[val >> 0x3];
else
ret = info->supported_voltages[val];
return ret;
}
static int ab8500_get_best_voltage_index(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
int i;
/* check the supported voltage */
for (i = 0; i < info->voltages_len; i++) {
if ((info->supported_voltages[i] >= min_uV) &&
(info->supported_voltages[i] <= max_uV))
return i;
}
return -EINVAL;
}
static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int regulator_id, ret;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
/* get the appropriate voltages within the range */
ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"couldn't get best voltage for regulator\n");
return ret;
}
/* set the registers for the request */
ret = ab8500_set_bits(info->ab8500, info->voltage_reg,
info->voltage_mask, ret);
if (ret < 0)
dev_err(rdev_get_dev(rdev),
"couldn't set voltage reg for regulator\n");
return ret;
}
static struct regulator_ops ab8500_regulator_ops = {
.enable = ab8500_regulator_enable,
.disable = ab8500_regulator_disable,
.is_enabled = ab8500_regulator_is_enabled,
.get_voltage = ab8500_regulator_get_voltage,
.set_voltage = ab8500_regulator_set_voltage,
.list_voltage = ab8500_list_voltage,
};
static int ab8500_fixed_get_voltage(struct regulator_dev *rdev)
{
int regulator_id;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
return info->fixed_uV;
}
static struct regulator_ops ab8500_ldo_fixed_ops = {
.enable = ab8500_regulator_enable,
.disable = ab8500_regulator_disable,
.is_enabled = ab8500_regulator_is_enabled,
.get_voltage = ab8500_fixed_get_voltage,
.list_voltage = ab8500_list_voltage,
};
#define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable, \
volt_reg, volt_mask, voltages, \
len_volts) \
{ \
.desc = { \
.name = "LDO-" #_id, \
.ops = &ab8500_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = AB8500_LDO_##_id, \
.owner = THIS_MODULE, \
}, \
.min_uV = (min) * 1000, \
.max_uV = (max) * 1000, \
.update_reg = reg, \
.mask = reg_mask, \
.enable = reg_enable, \
.voltage_reg = volt_reg, \
.voltage_mask = volt_mask, \
.supported_voltages = voltages, \
.voltages_len = len_volts, \
.fixed_uV = 0, \
}
#define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask, \
reg_enable) \
{ \
.desc = { \
.name = "LDO-" #_id, \
.ops = &ab8500_ldo_fixed_ops, \
.type = REGULATOR_VOLTAGE, \
.id = AB8500_LDO_##_id, \
.owner = THIS_MODULE, \
}, \
.fixed_uV = fixed * 1000, \
.update_reg = reg, \
.mask = reg_mask, \
.enable = reg_enable, \
}
static struct ab8500_regulator_info ab8500_regulator_info[] = {
/*
* Variable Voltage LDOs
* name, min uV, max uV, ctrl reg, reg mask, enable mask,
* volt ctrl reg, volt ctrl mask, volt table, num supported volts
*/
AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf,
ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf,
ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf,
ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38,
ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)),
/*
* Fixed Voltage LDOs
* name, o/p uV, ctrl reg, enable, disable
*/
AB8500_FIXED_LDO(TVOUT, 2000, 0x0380, 0x2, 0x2),
AB8500_FIXED_LDO(AUDIO, 2000, 0x0383, 0x2, 0x2),
AB8500_FIXED_LDO(ANAMIC1, 2050, 0x0383, 0x4, 0x4),
AB8500_FIXED_LDO(ANAMIC2, 2050, 0x0383, 0x8, 0x8),
AB8500_FIXED_LDO(DMIC, 1800, 0x0383, 0x10, 0x10),
AB8500_FIXED_LDO(ANA, 1200, 0x0383, 0xc, 0x4),
};
static inline struct ab8500_regulator_info *find_regulator_info(int id)
{
struct ab8500_regulator_info *info;
int i;
for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
info = &ab8500_regulator_info[i];
if (info->desc.id == id)
return info;
}
return NULL;
}
static __devinit int ab8500_regulator_probe(struct platform_device *pdev)
{
struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
struct ab8500_platform_data *pdata;
int i, err;
if (!ab8500) {
dev_err(&pdev->dev, "null mfd parent\n");
return -EINVAL;
}
pdata = dev_get_platdata(ab8500->dev);
/* register all regulators */
for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
struct ab8500_regulator_info *info = NULL;
/* assign per-regulator data */
info = &ab8500_regulator_info[i];
info->dev = &pdev->dev;
info->ab8500 = ab8500;
info->regulator = regulator_register(&info->desc, &pdev->dev,
pdata->regulator[i], info);
if (IS_ERR(info->regulator)) {
err = PTR_ERR(info->regulator);
dev_err(&pdev->dev, "failed to register regulator %s\n",
info->desc.name);
/* when we fail, un-register all earlier regulators */
while (--i >= 0) {
info = &ab8500_regulator_info[i];
regulator_unregister(info->regulator);
}
return err;
}
}
return 0;
}
static __devexit int ab8500_regulator_remove(struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
struct ab8500_regulator_info *info = NULL;
info = &ab8500_regulator_info[i];
regulator_unregister(info->regulator);
}
return 0;
}
static struct platform_driver ab8500_regulator_driver = {
.probe = ab8500_regulator_probe,
.remove = __devexit_p(ab8500_regulator_remove),
.driver = {
.name = "ab8500-regulator",
.owner = THIS_MODULE,
},
};
static int __init ab8500_regulator_init(void)
{
int ret;
ret = platform_driver_register(&ab8500_regulator_driver);
if (ret != 0)
pr_err("Failed to register ab8500 regulator: %d\n", ret);
return ret;
}
subsys_initcall(ab8500_regulator_init);
static void __exit ab8500_regulator_exit(void)
{
platform_driver_unregister(&ab8500_regulator_driver);
}
module_exit(ab8500_regulator_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC");
MODULE_ALIAS("platform:ab8500-regulator");
