cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tps6507x.c (3182B)

      1/*
      2 * tps6507x.c  --  TPS6507x chip family multi-function driver
      3 *
      4 *  Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
      5 *
      6 * Author: Todd Fischer
      7 *         todd.fischer@ridgerun.com
      8 *
      9 * Credits:
     10 *
     11 *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
     12 *
     13 * For licencing details see kernel-base/COPYING
     14 *
     15 */
     16
     17#include <linux/module.h>
     18#include <linux/moduleparam.h>
     19#include <linux/init.h>
     20#include <linux/slab.h>
     21#include <linux/i2c.h>
     22#include <linux/of.h>
     23#include <linux/of_device.h>
     24#include <linux/mfd/core.h>
     25#include <linux/mfd/tps6507x.h>
     26
     27static const struct mfd_cell tps6507x_devs[] = {
     28	{
     29		.name = "tps6507x-pmic",
     30	},
     31	{
     32		.name = "tps6507x-ts",
     33	},
     34};
     35
     36
     37static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
     38				  int bytes, void *dest)
     39{
     40	struct i2c_client *i2c = tps6507x->i2c_client;
     41	struct i2c_msg xfer[2];
     42	int ret;
     43
     44	/* Write register */
     45	xfer[0].addr = i2c->addr;
     46	xfer[0].flags = 0;
     47	xfer[0].len = 1;
     48	xfer[0].buf = &reg;
     49
     50	/* Read data */
     51	xfer[1].addr = i2c->addr;
     52	xfer[1].flags = I2C_M_RD;
     53	xfer[1].len = bytes;
     54	xfer[1].buf = dest;
     55
     56	ret = i2c_transfer(i2c->adapter, xfer, 2);
     57	if (ret == 2)
     58		ret = 0;
     59	else if (ret >= 0)
     60		ret = -EIO;
     61
     62	return ret;
     63}
     64
     65static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
     66				   int bytes, void *src)
     67{
     68	struct i2c_client *i2c = tps6507x->i2c_client;
     69	/* we add 1 byte for device register */
     70	u8 msg[TPS6507X_MAX_REGISTER + 1];
     71	int ret;
     72
     73	if (bytes > TPS6507X_MAX_REGISTER)
     74		return -EINVAL;
     75
     76	msg[0] = reg;
     77	memcpy(&msg[1], src, bytes);
     78
     79	ret = i2c_master_send(i2c, msg, bytes + 1);
     80	if (ret < 0)
     81		return ret;
     82	if (ret != bytes + 1)
     83		return -EIO;
     84	return 0;
     85}
     86
     87static int tps6507x_i2c_probe(struct i2c_client *i2c,
     88			    const struct i2c_device_id *id)
     89{
     90	struct tps6507x_dev *tps6507x;
     91
     92	tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
     93				GFP_KERNEL);
     94	if (tps6507x == NULL)
     95		return -ENOMEM;
     96
     97	i2c_set_clientdata(i2c, tps6507x);
     98	tps6507x->dev = &i2c->dev;
     99	tps6507x->i2c_client = i2c;
    100	tps6507x->read_dev = tps6507x_i2c_read_device;
    101	tps6507x->write_dev = tps6507x_i2c_write_device;
    102
    103	return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
    104				    ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
    105}
    106
    107static const struct i2c_device_id tps6507x_i2c_id[] = {
    108	{ "tps6507x", 0 },
    109	{ }
    110};
    111MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
    112
    113#ifdef CONFIG_OF
    114static const struct of_device_id tps6507x_of_match[] = {
    115	{.compatible = "ti,tps6507x", },
    116	{},
    117};
    118MODULE_DEVICE_TABLE(of, tps6507x_of_match);
    119#endif
    120
    121static struct i2c_driver tps6507x_i2c_driver = {
    122	.driver = {
    123		   .name = "tps6507x",
    124		   .of_match_table = of_match_ptr(tps6507x_of_match),
    125	},
    126	.probe = tps6507x_i2c_probe,
    127	.id_table = tps6507x_i2c_id,
    128};
    129
    130static int __init tps6507x_i2c_init(void)
    131{
    132	return i2c_add_driver(&tps6507x_i2c_driver);
    133}
    134/* init early so consumer devices can complete system boot */
    135subsys_initcall(tps6507x_i2c_init);
    136
    137static void __exit tps6507x_i2c_exit(void)
    138{
    139	i2c_del_driver(&tps6507x_i2c_driver);
    140}
    141module_exit(tps6507x_i2c_exit);
    142
    143MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
    144MODULE_LICENSE("GPL");