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/*
* Copyright (C) ST-Ericsson SA 2011
*
* License Terms: GNU General Public License v2
* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
*
* Power domain regulators on DB5500
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/db5500-prcmu.h>
#include <linux/mfd/dbx500-prcmu.h>
#include "dbx500-prcmu.h"
static int db5500_regulator_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
info->desc.name);
if (!info->is_enabled) {
info->is_enabled = true;
if (!info->exclude_from_power_state)
power_state_active_enable();
}
return 0;
}
static int db5500_regulator_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret = 0;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
info->desc.name);
if (info->is_enabled) {
info->is_enabled = false;
if (!info->exclude_from_power_state)
ret = power_state_active_disable();
}
return ret;
}
static int db5500_regulator_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
" %i\n", info->desc.name, info->is_enabled);
return info->is_enabled;
}
/* db5500 regulator operations */
static struct regulator_ops db5500_regulator_ops = {
.enable = db5500_regulator_enable,
.disable = db5500_regulator_disable,
.is_enabled = db5500_regulator_is_enabled,
};
/*
* EPOD control
*/
static bool epod_on[NUM_EPOD_ID];
static bool epod_ramret[NUM_EPOD_ID];
static inline int epod_id_to_index(u16 epod_id)
{
return epod_id - DB5500_EPOD_ID_BASE;
}
static int enable_epod(u16 epod_id, bool ramret)
{
int idx = epod_id_to_index(epod_id);
int ret;
if (ramret) {
if (!epod_on[idx]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
}
epod_ramret[idx] = true;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
if (ret < 0)
return ret;
epod_on[idx] = true;
}
return 0;
}
static int disable_epod(u16 epod_id, bool ramret)
{
int idx = epod_id_to_index(epod_id);
int ret;
if (ramret) {
if (!epod_on[idx]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_ramret[idx] = false;
} else {
if (epod_ramret[idx]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_on[idx] = false;
}
return 0;
}
/*
* Regulator switch
*/
static int db5500_regulator_switch_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
info->desc.name);
ret = enable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator-switch-%s-enable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = true;
out:
return ret;
}
static int db5500_regulator_switch_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
info->desc.name);
ret = disable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator_switch-%s-disable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = 0;
out:
return ret;
}
static int db5500_regulator_switch_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev),
"regulator-switch-%s-is_enabled (is_enabled): %i\n",
info->desc.name, info->is_enabled);
return info->is_enabled;
}
static struct regulator_ops db5500_regulator_switch_ops = {
.enable = db5500_regulator_switch_enable,
.disable = db5500_regulator_switch_disable,
.is_enabled = db5500_regulator_switch_is_enabled,
};
/*
* Regulator information
*/
#define DB5500_REGULATOR_SWITCH(_name, reg) \
[DB5500_REGULATOR_SWITCH_##reg] = { \
.desc = { \
.name = _name, \
.id = DB5500_REGULATOR_SWITCH_##reg, \
.ops = &db5500_regulator_switch_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}, \
.epod_id = DB5500_EPOD_ID_##reg, \
}
static struct dbx500_regulator_info
dbx500_regulator_info[DB5500_NUM_REGULATORS] = {
[DB5500_REGULATOR_VAPE] = {
.desc = {
.name = "db5500-vape",
.id = DB5500_REGULATOR_VAPE,
.ops = &db5500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
DB5500_REGULATOR_SWITCH("db5500-sga", SGA),
DB5500_REGULATOR_SWITCH("db5500-hva", HVA),
DB5500_REGULATOR_SWITCH("db5500-sia", SIA),
DB5500_REGULATOR_SWITCH("db5500-disp", DISP),
DB5500_REGULATOR_SWITCH("db5500-esram12", ESRAM12),
};
static int __devinit db5500_regulator_probe(struct platform_device *pdev)
{
struct regulator_init_data *db5500_init_data =
dev_get_platdata(&pdev->dev);
int i, err;
/* register all regulators */
for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
struct dbx500_regulator_info *info;
struct regulator_init_data *init_data = &db5500_init_data[i];
/* assign per-regulator data */
info = &dbx500_regulator_info[i];
info->dev = &pdev->dev;
/* register with the regulator framework */
info->rdev = regulator_register(&info->desc, &pdev->dev,
init_data, info);
if (IS_ERR(info->rdev)) {
err = PTR_ERR(info->rdev);
dev_err(&pdev->dev, "failed to register %s: err %i\n",
info->desc.name, err);
/* if failing, unregister all earlier regulators */
i--;
while (i >= 0) {
info = &dbx500_regulator_info[i];
regulator_unregister(info->rdev);
i--;
}
return err;
}
dev_dbg(rdev_get_dev(info->rdev),
"regulator-%s-probed\n", info->desc.name);
}
return 0;
}
static int __exit db5500_regulator_remove(struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
struct dbx500_regulator_info *info;
info = &dbx500_regulator_info[i];
dev_vdbg(rdev_get_dev(info->rdev),
"regulator-%s-remove\n", info->desc.name);
regulator_unregister(info->rdev);
}
return 0;
}
static struct platform_driver db5500_regulator_driver = {
.driver = {
.name = "db5500-prcmu-regulators",
.owner = THIS_MODULE,
},
.probe = db5500_regulator_probe,
.remove = __exit_p(db5500_regulator_remove),
};
static int __init db5500_regulator_init(void)
{
int ret;
ret = platform_driver_register(&db5500_regulator_driver);
if (ret < 0)
return -ENODEV;
return 0;
}
static void __exit db5500_regulator_exit(void)
{
platform_driver_unregister(&db5500_regulator_driver);
}
arch_initcall(db5500_regulator_init);
module_exit(db5500_regulator_exit);
MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
MODULE_DESCRIPTION("DB5500 regulator driver");
MODULE_LICENSE("GPL v2");
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