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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
/*
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* tps65912-i2c.c -- I2C access for TI TPS65912x PMIC
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*
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* Copyright 2011 Texas Instruments Inc.
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*
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* Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This driver is based on wm8350 implementation.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65912.h>
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static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg,
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int bytes, void *dest)
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{
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struct i2c_client *i2c = tps65912->control_data;
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struct i2c_msg xfer[2];
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int ret;
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/* Write register */
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xfer[0].addr = i2c->addr;
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xfer[0].flags = 0;
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xfer[0].len = 1;
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xfer[0].buf = ®
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/* Read data */
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xfer[1].addr = i2c->addr;
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xfer[1].flags = I2C_M_RD;
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xfer[1].len = bytes;
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xfer[1].buf = dest;
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ret = i2c_transfer(i2c->adapter, xfer, 2);
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if (ret == 2)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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return ret;
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}
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static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg,
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int bytes, void *src)
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{
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struct i2c_client *i2c = tps65912->control_data;
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/* we add 1 byte for device register */
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u8 msg[TPS6591X_MAX_REGISTER + 1];
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int ret;
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if (bytes > TPS6591X_MAX_REGISTER)
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return -EINVAL;
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msg[0] = reg;
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memcpy(&msg[1], src, bytes);
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ret = i2c_master_send(i2c, msg, bytes + 1);
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if (ret < 0)
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return ret;
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if (ret != bytes + 1)
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return -EIO;
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return 0;
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}
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static int tps65912_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct tps65912 *tps65912;
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tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
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if (tps65912 == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, tps65912);
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tps65912->dev = &i2c->dev;
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tps65912->control_data = i2c;
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tps65912->read = tps65912_i2c_read;
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tps65912->write = tps65912_i2c_write;
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return tps65912_device_init(tps65912);
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}
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static int tps65912_i2c_remove(struct i2c_client *i2c)
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{
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struct tps65912 *tps65912 = i2c_get_clientdata(i2c);
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tps65912_device_exit(tps65912);
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return 0;
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}
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static const struct i2c_device_id tps65912_i2c_id[] = {
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{"tps65912", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id);
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static struct i2c_driver tps65912_i2c_driver = {
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.driver = {
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.name = "tps65912",
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.owner = THIS_MODULE,
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},
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.probe = tps65912_i2c_probe,
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.remove = tps65912_i2c_remove,
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.id_table = tps65912_i2c_id,
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};
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static int __init tps65912_i2c_init(void)
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{
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int ret;
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ret = i2c_add_driver(&tps65912_i2c_driver);
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if (ret != 0)
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pr_err("Failed to register TPS65912 I2C driver: %d\n", ret);
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return ret;
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(tps65912_i2c_init);
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static void __exit tps65912_i2c_exit(void)
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{
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i2c_del_driver(&tps65912_i2c_driver);
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}
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module_exit(tps65912_i2c_exit);
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MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
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MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
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MODULE_LICENSE("GPL");
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