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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ad5696-i2c.c (3026B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * AD5338R, AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693,
      4 * AD5693R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
      5 * Digital to analog converters driver
      6 *
      7 * Copyright 2018 Analog Devices Inc.
      8 */
      9
     10#include "ad5686.h"
     11
     12#include <linux/module.h>
     13#include <linux/i2c.h>
     14
     15static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
     16{
     17	struct i2c_client *i2c = to_i2c_client(st->dev);
     18	struct i2c_msg msg[2] = {
     19		{
     20			.addr = i2c->addr,
     21			.flags = i2c->flags,
     22			.len = 3,
     23			.buf = &st->data[0].d8[1],
     24		},
     25		{
     26			.addr = i2c->addr,
     27			.flags = i2c->flags | I2C_M_RD,
     28			.len = 2,
     29			.buf = (char *)&st->data[0].d16,
     30		},
     31	};
     32	int ret;
     33
     34	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
     35				      AD5686_ADDR(addr) |
     36				      0x00);
     37
     38	ret = i2c_transfer(i2c->adapter, msg, 2);
     39	if (ret < 0)
     40		return ret;
     41
     42	return be16_to_cpu(st->data[0].d16);
     43}
     44
     45static int ad5686_i2c_write(struct ad5686_state *st,
     46			    u8 cmd, u8 addr, u16 val)
     47{
     48	struct i2c_client *i2c = to_i2c_client(st->dev);
     49	int ret;
     50
     51	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
     52				      | val);
     53
     54	ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
     55	if (ret < 0)
     56		return ret;
     57
     58	return (ret != 3) ? -EIO : 0;
     59}
     60
     61static int ad5686_i2c_probe(struct i2c_client *i2c,
     62			    const struct i2c_device_id *id)
     63{
     64	return ad5686_probe(&i2c->dev, id->driver_data, id->name,
     65			    ad5686_i2c_write, ad5686_i2c_read);
     66}
     67
     68static int ad5686_i2c_remove(struct i2c_client *i2c)
     69{
     70	ad5686_remove(&i2c->dev);
     71
     72	return 0;
     73}
     74
     75static const struct i2c_device_id ad5686_i2c_id[] = {
     76	{"ad5311r", ID_AD5311R},
     77	{"ad5338r", ID_AD5338R},
     78	{"ad5671r", ID_AD5671R},
     79	{"ad5673r", ID_AD5673R},
     80	{"ad5675r", ID_AD5675R},
     81	{"ad5677r", ID_AD5677R},
     82	{"ad5691r", ID_AD5691R},
     83	{"ad5692r", ID_AD5692R},
     84	{"ad5693", ID_AD5693},
     85	{"ad5693r", ID_AD5693R},
     86	{"ad5694", ID_AD5694},
     87	{"ad5694r", ID_AD5694R},
     88	{"ad5695r", ID_AD5695R},
     89	{"ad5696", ID_AD5696},
     90	{"ad5696r", ID_AD5696R},
     91	{}
     92};
     93MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
     94
     95static const struct of_device_id ad5686_of_match[] = {
     96	{ .compatible = "adi,ad5311r" },
     97	{ .compatible = "adi,ad5338r" },
     98	{ .compatible = "adi,ad5671r" },
     99	{ .compatible = "adi,ad5675r" },
    100	{ .compatible = "adi,ad5691r" },
    101	{ .compatible = "adi,ad5692r" },
    102	{ .compatible = "adi,ad5693" },
    103	{ .compatible = "adi,ad5693r" },
    104	{ .compatible = "adi,ad5694" },
    105	{ .compatible = "adi,ad5694r" },
    106	{ .compatible = "adi,ad5695r" },
    107	{ .compatible = "adi,ad5696" },
    108	{ .compatible = "adi,ad5696r" },
    109	{}
    110};
    111MODULE_DEVICE_TABLE(of, ad5686_of_match);
    112
    113static struct i2c_driver ad5686_i2c_driver = {
    114	.driver = {
    115		.name = "ad5696",
    116		.of_match_table = ad5686_of_match,
    117	},
    118	.probe = ad5686_i2c_probe,
    119	.remove = ad5686_i2c_remove,
    120	.id_table = ad5686_i2c_id,
    121};
    122
    123module_i2c_driver(ad5686_i2c_driver);
    124
    125MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
    126MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
    127MODULE_LICENSE("GPL v2");
    128MODULE_IMPORT_NS(IIO_AD5686);