Revision 761bfb999868c413aabed8caa345694836ec6f11 authored by Alex Deucher on 06 August 2013, 17:34:00 UTC, committed by Alex Deucher on 07 August 2013, 21:37:19 UTC
The rlc is required for dpm to work properly, so if the rlc ucode is missing, don't enable dpm. Enabling dpm without the rlc enabled can result in hangs. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 parent f61d5b4
isl6271a-regulator.c
/*
* isl6271a-regulator.c
*
* Support for Intersil ISL6271A voltage regulator
*
* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#define ISL6271A_VOLTAGE_MIN 850000
#define ISL6271A_VOLTAGE_MAX 1600000
#define ISL6271A_VOLTAGE_STEP 50000
/* PMIC details */
struct isl_pmic {
struct i2c_client *client;
struct regulator_dev *rdev[3];
struct mutex mtx;
};
static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
{
struct isl_pmic *pmic = rdev_get_drvdata(dev);
int idx;
mutex_lock(&pmic->mtx);
idx = i2c_smbus_read_byte(pmic->client);
if (idx < 0)
dev_err(&pmic->client->dev, "Error getting voltage\n");
mutex_unlock(&pmic->mtx);
return idx;
}
static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
unsigned selector)
{
struct isl_pmic *pmic = rdev_get_drvdata(dev);
int err;
mutex_lock(&pmic->mtx);
err = i2c_smbus_write_byte(pmic->client, selector);
if (err < 0)
dev_err(&pmic->client->dev, "Error setting voltage\n");
mutex_unlock(&pmic->mtx);
return err;
}
static struct regulator_ops isl_core_ops = {
.get_voltage_sel = isl6271a_get_voltage_sel,
.set_voltage_sel = isl6271a_set_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
};
static struct regulator_ops isl_fixed_ops = {
.list_voltage = regulator_list_voltage_linear,
};
static const struct regulator_desc isl_rd[] = {
{
.name = "Core Buck",
.id = 0,
.n_voltages = 16,
.ops = &isl_core_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.min_uV = ISL6271A_VOLTAGE_MIN,
.uV_step = ISL6271A_VOLTAGE_STEP,
}, {
.name = "LDO1",
.id = 1,
.n_voltages = 1,
.ops = &isl_fixed_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.min_uV = 1100000,
}, {
.name = "LDO2",
.id = 2,
.n_voltages = 1,
.ops = &isl_fixed_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.min_uV = 1300000,
},
};
static int isl6271a_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct regulator_config config = { };
struct regulator_init_data *init_data = i2c->dev.platform_data;
struct isl_pmic *pmic;
int err, i;
if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
if (!pmic)
return -ENOMEM;
pmic->client = i2c;
mutex_init(&pmic->mtx);
for (i = 0; i < 3; i++) {
config.dev = &i2c->dev;
if (i == 0)
config.init_data = init_data;
else
config.init_data = NULL;
config.driver_data = pmic;
pmic->rdev[i] = regulator_register(&isl_rd[i], &config);
if (IS_ERR(pmic->rdev[i])) {
dev_err(&i2c->dev, "failed to register %s\n", id->name);
err = PTR_ERR(pmic->rdev[i]);
goto error;
}
}
i2c_set_clientdata(i2c, pmic);
return 0;
error:
while (--i >= 0)
regulator_unregister(pmic->rdev[i]);
return err;
}
static int isl6271a_remove(struct i2c_client *i2c)
{
struct isl_pmic *pmic = i2c_get_clientdata(i2c);
int i;
for (i = 0; i < 3; i++)
regulator_unregister(pmic->rdev[i]);
return 0;
}
static const struct i2c_device_id isl6271a_id[] = {
{.name = "isl6271a", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, isl6271a_id);
static struct i2c_driver isl6271a_i2c_driver = {
.driver = {
.name = "isl6271a",
.owner = THIS_MODULE,
},
.probe = isl6271a_probe,
.remove = isl6271a_remove,
.id_table = isl6271a_id,
};
static int __init isl6271a_init(void)
{
return i2c_add_driver(&isl6271a_i2c_driver);
}
static void __exit isl6271a_cleanup(void)
{
i2c_del_driver(&isl6271a_i2c_driver);
}
subsys_initcall(isl6271a_init);
module_exit(isl6271a_cleanup);
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
MODULE_LICENSE("GPL v2");
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