mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-27 20:07:09 +00:00
63c8a58d22
If bytes == (TPS6591X_MAX_REGISTER + 1), we have a buffer overflow when doing memcpy(&msg[1], src, bytes). Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/*
|
|
* tps65912-i2c.c -- I2C access for TI TPS65912x PMIC
|
|
*
|
|
* Copyright 2011 Texas Instruments Inc.
|
|
*
|
|
* Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
|
|
*
|
|
* 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; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* This driver is based on wm8350 implementation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/tps65912.h>
|
|
|
|
static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg,
|
|
int bytes, void *dest)
|
|
{
|
|
struct i2c_client *i2c = tps65912->control_data;
|
|
struct i2c_msg xfer[2];
|
|
int ret;
|
|
|
|
/* Write register */
|
|
xfer[0].addr = i2c->addr;
|
|
xfer[0].flags = 0;
|
|
xfer[0].len = 1;
|
|
xfer[0].buf = ®
|
|
|
|
/* Read data */
|
|
xfer[1].addr = i2c->addr;
|
|
xfer[1].flags = I2C_M_RD;
|
|
xfer[1].len = bytes;
|
|
xfer[1].buf = dest;
|
|
|
|
ret = i2c_transfer(i2c->adapter, xfer, 2);
|
|
if (ret == 2)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
return ret;
|
|
}
|
|
|
|
static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg,
|
|
int bytes, void *src)
|
|
{
|
|
struct i2c_client *i2c = tps65912->control_data;
|
|
/* we add 1 byte for device register */
|
|
u8 msg[TPS6591X_MAX_REGISTER + 1];
|
|
int ret;
|
|
|
|
if (bytes > TPS6591X_MAX_REGISTER)
|
|
return -EINVAL;
|
|
|
|
msg[0] = reg;
|
|
memcpy(&msg[1], src, bytes);
|
|
|
|
ret = i2c_master_send(i2c, msg, bytes + 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != bytes + 1)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65912_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct tps65912 *tps65912;
|
|
|
|
tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
|
|
if (tps65912 == NULL)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(i2c, tps65912);
|
|
tps65912->dev = &i2c->dev;
|
|
tps65912->control_data = i2c;
|
|
tps65912->read = tps65912_i2c_read;
|
|
tps65912->write = tps65912_i2c_write;
|
|
|
|
return tps65912_device_init(tps65912);
|
|
}
|
|
|
|
static int tps65912_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct tps65912 *tps65912 = i2c_get_clientdata(i2c);
|
|
|
|
tps65912_device_exit(tps65912);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id tps65912_i2c_id[] = {
|
|
{"tps65912", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id);
|
|
|
|
static struct i2c_driver tps65912_i2c_driver = {
|
|
.driver = {
|
|
.name = "tps65912",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = tps65912_i2c_probe,
|
|
.remove = tps65912_i2c_remove,
|
|
.id_table = tps65912_i2c_id,
|
|
};
|
|
|
|
static int __init tps65912_i2c_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_add_driver(&tps65912_i2c_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register TPS65912 I2C driver: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
/* init early so consumer devices can complete system boot */
|
|
subsys_initcall(tps65912_i2c_init);
|
|
|
|
static void __exit tps65912_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&tps65912_i2c_driver);
|
|
}
|
|
module_exit(tps65912_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
|
|
MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
|
|
MODULE_LICENSE("GPL");
|