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/*
* Copyright (C) 2009 STMicroelectronics
* Copyright (C) 2010 ST Ericsson.
*
* 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.
*
* AB8500 peripheral regulators
*
* LDOs VAUX1/2
*
* FIXME : PRCMU I2C calls to be replaced by ab8500_* calls once integrated
* with the ab8500 driver.
* FIXME : Regulator IDs constants are defined here until the ab8500 driver
* is made into a mfd compliant code.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/consumer.h>
#include <mach/prcmu-fw-api.h>
#include <mach/ab8500.h>
#define AB8500_NUM_REGULATORS (5)
#define AB8500_LDO_VAUX1 (1)
#define AB8500_LDO_VAUX2 (2)
#define AB8500_LDO_VTVOUT (3)
#define AB8500_DCDC_VBUS (4)
static int ab8500_ldo_enable(struct regulator_dev *rdev)
{
int regulator_id, ret, val;
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
/* FIXME : as reads from regulator bank are not supported yet
* enable both the VAUX1/2 by default. Add appropriate
* read calls when I2C_APE support is available
*/
if ((regulator_id == AB8500_LDO_VAUX1) ||
(regulator_id == AB8500_LDO_VAUX2))
prcmu_i2c_write(AB8500_REGU_CTRL2,
AB8500_REGU_VAUX12_REGU_REG, 0x5);
switch (regulator_id) {
case AB8500_LDO_VAUX1:
prcmu_i2c_write(AB8500_REGU_CTRL2,
AB8500_REGU_VAUX1_SEL_REG, 0x0F);
break;
case AB8500_LDO_VAUX2:
prcmu_i2c_write(AB8500_REGU_CTRL2,
AB8500_REGU_VAUX2_SEL_REG, 0x0D);
break;
case AB8500_LDO_VTVOUT:
val = ab8500_read(AB8500_REGU_CTRL1, AB8500_REGU_MISC1_REG);
ret = ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_MISC1_REG, (val | 0x06));
if (ret < 0) {
dev_dbg(rdev_get_dev(rdev),
"cannot enable TVOUT LDO\n");
return -EINVAL;
}
break;
default:
dev_dbg(rdev_get_dev(rdev), "unknown regulator id\n");
return -EINVAL;
}
return 0;
}
static int ab8500_ldo_disable(struct regulator_dev *rdev)
{
int regulator_id, ret, val;
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
switch (regulator_id) {
case AB8500_LDO_VAUX1:
case AB8500_LDO_VAUX2:
prcmu_i2c_write(AB8500_REGU_CTRL2,
AB8500_REGU_VAUX12_REGU_REG, 0x0);
break;
case AB8500_LDO_VTVOUT:
val = ab8500_read(AB8500_REGU_CTRL1, AB8500_REGU_MISC1_REG);
ret = ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_MISC1_REG, (val & 0xF9));
if (ret < 0) {
dev_dbg(rdev_get_dev(rdev),
"cannot disable TVOUT LDO\n");
return -EINVAL;
}
break;
default:
dev_dbg(rdev_get_dev(rdev), "unknown regulator id\n");
return -EINVAL;
}
return 0;
}
static int ab8500_ldo_is_enabled(struct regulator_dev *rdev)
{
int regulator_id, val;
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
/* FIXME : once the APE_I2C read is supported, add code */
switch (regulator_id) {
case AB8500_LDO_VAUX1:
case AB8500_LDO_VAUX2:
case AB8500_LDO_VTVOUT:
val = ab8500_read(AB8500_REGU_CTRL1, AB8500_REGU_MISC1_REG);
if (val & 0x06)
return true;
default:
dev_dbg(rdev_get_dev(rdev), "unknown regulator id\n");
return -EINVAL;
}
return 0;
}
/* operations for LDOs (VAUX1/2, TVOut) generalized */
static struct regulator_ops ab8500_ldo_ops = {
.enable = ab8500_ldo_enable,
.disable = ab8500_ldo_disable,
.is_enabled = ab8500_ldo_is_enabled,
};
static int ab8500_dcdc_enable(struct regulator_dev *rdev)
{
int regulator_id, ret;
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
switch (regulator_id) {
case AB8500_DCDC_VBUS:
ret = ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, 0x1);
if (ret < 0) {
dev_dbg(rdev_get_dev(rdev),
"cannot enable VBUS\n");
return -EINVAL;
}
break;
default:
dev_dbg(rdev_get_dev(rdev), "unknown regulator id\n");
return -EINVAL;
}
return 0;
}
static int ab8500_dcdc_disable(struct regulator_dev *rdev)
{
int regulator_id, ret;
regulator_id = rdev_get_id(rdev);
if (regulator_id >= AB8500_NUM_REGULATORS)
return -EINVAL;
switch (regulator_id) {
case AB8500_DCDC_VBUS:
ret = ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, 0x0);
if (ret < 0) {
dev_dbg(rdev_get_dev(rdev),
"cannot disable VBUS\n");
return -EINVAL;
}
break;
default:
dev_dbg(rdev_get_dev(rdev), "unknown regulator id\n");
return -EINVAL;
}
return 0;
}
/* operations for DC-DC convertor supplies (VBUS, VSMPS1/2) */
static struct regulator_ops ab8500_dcdc_ops = {
.enable = ab8500_dcdc_enable,
.disable = ab8500_dcdc_disable,
};
static struct regulator_desc ab8500_desc[AB8500_NUM_REGULATORS] = {
{
.name = "LDO-VAUX1",
.id = AB8500_LDO_VAUX1,
.ops = &ab8500_ldo_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO-VAUX2",
.id = AB8500_LDO_VAUX2,
.ops = &ab8500_ldo_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO-VTVOUT",
.id = AB8500_LDO_VTVOUT,
.ops = &ab8500_ldo_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC-VBUS",
.id = AB8500_DCDC_VBUS,
.ops = &ab8500_dcdc_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
};
static int __devinit ab8500_regulator_probe(struct platform_device *pdev)
{
struct regulator_dev *rdev;
rdev = regulator_register(&ab8500_desc[pdev->id], &pdev->dev, NULL);
if (IS_ERR(rdev)) {
dev_dbg(&pdev->dev, "couldn't register regulator\n");
return PTR_ERR(rdev);
}
platform_set_drvdata(pdev, rdev);
return 0;
}
static int __devexit ab8500_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *reg_dev = platform_get_drvdata(pdev);
regulator_unregister(reg_dev);
return 0;
}
static struct platform_driver ab8500_regulator_driver = {
.driver = {
.name = "ab8500-regulator",
},
.probe = ab8500_regulator_probe,
.remove = __devexit_p(ab8500_regulator_remove),
};
static int __init ab8500_regulator_init(void)
{
int ret = 0;
ret = platform_driver_register(&ab8500_regulator_driver);
if (ret) {
printk(KERN_INFO
"ab8500_regulator : platform_driver_register fails\n");
return -ENODEV;
}
return 0;
}
static void __exit ab8500_regulator_exit(void)
{
platform_driver_unregister(&ab8500_regulator_driver);
}
/* replacing subsys_call as we want amba devices to be "powered" on */
arch_initcall(ab8500_regulator_init);
module_exit(ab8500_regulator_exit);
MODULE_AUTHOR("STMicroelectronics/STEricsson");
MODULE_DESCRIPTION("AB8500 Voltage Framework");
MODULE_LICENSE("GPL");
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