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/*
* tps65217.c
*
* TPS65217 chip family multi-function driver
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.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/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>
static struct mfd_cell tps65217s[] = {
{
.name = "tps65217-pmic",
},
};
/**
* tps65217_reg_read: Read a single tps65217 register.
*
* @tps: Device to read from.
* @reg: Register to read.
* @val: Contians the value
*/
int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
unsigned int *val)
{
return regmap_read(tps->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65217_reg_read);
/**
* tps65217_reg_write: Write a single tps65217 register.
*
* @tps65217: Device to write to.
* @reg: Register to write to.
* @val: Value to write.
* @level: Password protected level
*/
int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
unsigned int val, unsigned int level)
{
int ret;
unsigned int xor_reg_val;
switch (level) {
case TPS65217_PROTECT_NONE:
return regmap_write(tps->regmap, reg, val);
case TPS65217_PROTECT_L1:
xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
return regmap_write(tps->regmap, reg, val);
case TPS65217_PROTECT_L2:
xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
ret = regmap_write(tps->regmap, reg, val);
if (ret < 0)
return ret;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
return regmap_write(tps->regmap, reg, val);
default:
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(tps65217_reg_write);
/**
* tps65217_update_bits: Modify bits w.r.t mask, val and level.
*
* @tps65217: Device to write to.
* @reg: Register to read-write to.
* @mask: Mask.
* @val: Value to write.
* @level: Password protected level
*/
static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
int ret;
unsigned int data;
ret = tps65217_reg_read(tps, reg, &data);
if (ret) {
dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
return ret;
}
data &= ~mask;
data |= val & mask;
ret = tps65217_reg_write(tps, reg, data, level);
if (ret)
dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
return ret;
}
int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
return tps65217_update_bits(tps, reg, mask, val, level);
}
EXPORT_SYMBOL_GPL(tps65217_set_bits);
int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int level)
{
return tps65217_update_bits(tps, reg, mask, 0, level);
}
EXPORT_SYMBOL_GPL(tps65217_clear_bits);
static struct regmap_config tps65217_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static const struct of_device_id tps65217_of_match[] = {
{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
{ /* sentinel */ },
};
static int __devinit tps65217_probe(struct i2c_client *client,
const struct i2c_device_id *ids)
{
struct tps65217 *tps;
unsigned int version;
unsigned int chip_id = ids->driver_data;
const struct of_device_id *match;
int ret;
if (client->dev.of_node) {
match = of_match_device(tps65217_of_match, &client->dev);
if (!match) {
dev_err(&client->dev,
"Failed to find matching dt id\n");
return -EINVAL;
}
chip_id = (unsigned int)match->data;
}
if (!chip_id) {
dev_err(&client->dev, "id is null.\n");
return -ENODEV;
}
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
i2c_set_clientdata(client, tps);
tps->dev = &client->dev;
tps->id = chip_id;
tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
if (IS_ERR(tps->regmap)) {
ret = PTR_ERR(tps->regmap);
dev_err(tps->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = mfd_add_devices(tps->dev, -1, tps65217s,
ARRAY_SIZE(tps65217s), NULL, 0);
if (ret < 0) {
dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
return ret;
}
ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
if (ret < 0) {
dev_err(tps->dev, "Failed to read revision register: %d\n",
ret);
return ret;
}
dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
version & TPS65217_CHIPID_REV_MASK);
return 0;
}
static int __devexit tps65217_remove(struct i2c_client *client)
{
struct tps65217 *tps = i2c_get_clientdata(client);
mfd_remove_devices(tps->dev);
return 0;
}
static const struct i2c_device_id tps65217_id_table[] = {
{"tps65217", TPS65217},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
static struct i2c_driver tps65217_driver = {
.driver = {
.name = "tps65217",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(tps65217_of_match),
},
.id_table = tps65217_id_table,
.probe = tps65217_probe,
.remove = __devexit_p(tps65217_remove),
};
static int __init tps65217_init(void)
{
return i2c_add_driver(&tps65217_driver);
}
subsys_initcall(tps65217_init);
static void __exit tps65217_exit(void)
{
i2c_del_driver(&tps65217_driver);
}
module_exit(tps65217_exit);
MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
MODULE_LICENSE("GPL v2");
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