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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ad525x_dpot-spi.c (2879B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Driver for the Analog Devices digital potentiometers (SPI bus)
      4 *
      5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
      6 */
      7
      8#include <linux/spi/spi.h>
      9#include <linux/module.h>
     10
     11#include "ad525x_dpot.h"
     12
     13/* SPI bus functions */
     14static int write8(void *client, u8 val)
     15{
     16	u8 data = val;
     17
     18	return spi_write(client, &data, 1);
     19}
     20
     21static int write16(void *client, u8 reg, u8 val)
     22{
     23	u8 data[2] = {reg, val};
     24
     25	return spi_write(client, data, 2);
     26}
     27
     28static int write24(void *client, u8 reg, u16 val)
     29{
     30	u8 data[3] = {reg, val >> 8, val};
     31
     32	return spi_write(client, data, 3);
     33}
     34
     35static int read8(void *client)
     36{
     37	int ret;
     38	u8 data;
     39
     40	ret = spi_read(client, &data, 1);
     41	if (ret < 0)
     42		return ret;
     43
     44	return data;
     45}
     46
     47static int read16(void *client, u8 reg)
     48{
     49	int ret;
     50	u8 buf_rx[2];
     51
     52	write16(client, reg, 0);
     53	ret = spi_read(client, buf_rx, 2);
     54	if (ret < 0)
     55		return ret;
     56
     57	return (buf_rx[0] << 8) |  buf_rx[1];
     58}
     59
     60static int read24(void *client, u8 reg)
     61{
     62	int ret;
     63	u8 buf_rx[3];
     64
     65	write24(client, reg, 0);
     66	ret = spi_read(client, buf_rx, 3);
     67	if (ret < 0)
     68		return ret;
     69
     70	return (buf_rx[1] << 8) |  buf_rx[2];
     71}
     72
     73static const struct ad_dpot_bus_ops bops = {
     74	.read_d8	= read8,
     75	.read_r8d8	= read16,
     76	.read_r8d16	= read24,
     77	.write_d8	= write8,
     78	.write_r8d8	= write16,
     79	.write_r8d16	= write24,
     80};
     81static int ad_dpot_spi_probe(struct spi_device *spi)
     82{
     83	struct ad_dpot_bus_data bdata = {
     84		.client = spi,
     85		.bops = &bops,
     86	};
     87
     88	return ad_dpot_probe(&spi->dev, &bdata,
     89			     spi_get_device_id(spi)->driver_data,
     90			     spi_get_device_id(spi)->name);
     91}
     92
     93static void ad_dpot_spi_remove(struct spi_device *spi)
     94{
     95	ad_dpot_remove(&spi->dev);
     96}
     97
     98static const struct spi_device_id ad_dpot_spi_id[] = {
     99	{"ad5160", AD5160_ID},
    100	{"ad5161", AD5161_ID},
    101	{"ad5162", AD5162_ID},
    102	{"ad5165", AD5165_ID},
    103	{"ad5200", AD5200_ID},
    104	{"ad5201", AD5201_ID},
    105	{"ad5203", AD5203_ID},
    106	{"ad5204", AD5204_ID},
    107	{"ad5206", AD5206_ID},
    108	{"ad5207", AD5207_ID},
    109	{"ad5231", AD5231_ID},
    110	{"ad5232", AD5232_ID},
    111	{"ad5233", AD5233_ID},
    112	{"ad5235", AD5235_ID},
    113	{"ad5260", AD5260_ID},
    114	{"ad5262", AD5262_ID},
    115	{"ad5263", AD5263_ID},
    116	{"ad5290", AD5290_ID},
    117	{"ad5291", AD5291_ID},
    118	{"ad5292", AD5292_ID},
    119	{"ad5293", AD5293_ID},
    120	{"ad7376", AD7376_ID},
    121	{"ad8400", AD8400_ID},
    122	{"ad8402", AD8402_ID},
    123	{"ad8403", AD8403_ID},
    124	{"adn2850", ADN2850_ID},
    125	{"ad5270", AD5270_ID},
    126	{"ad5271", AD5271_ID},
    127	{}
    128};
    129MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
    130
    131static struct spi_driver ad_dpot_spi_driver = {
    132	.driver = {
    133		.name	= "ad_dpot",
    134	},
    135	.probe		= ad_dpot_spi_probe,
    136	.remove		= ad_dpot_spi_remove,
    137	.id_table	= ad_dpot_spi_id,
    138};
    139
    140module_spi_driver(ad_dpot_spi_driver);
    141
    142MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
    143MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
    144MODULE_LICENSE("GPL");
    145MODULE_ALIAS("spi:ad_dpot");