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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ad7879-spi.c (1744B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * AD7879/AD7889 touchscreen (SPI bus)
      4 *
      5 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
      6 */
      7
      8#include <linux/input.h>	/* BUS_SPI */
      9#include <linux/pm.h>
     10#include <linux/spi/spi.h>
     11#include <linux/module.h>
     12#include <linux/of.h>
     13#include <linux/regmap.h>
     14
     15#include "ad7879.h"
     16
     17#define AD7879_DEVID		0x7A	/* AD7879/AD7889 */
     18
     19#define MAX_SPI_FREQ_HZ      5000000
     20
     21#define AD7879_CMD_MAGIC     0xE0
     22#define AD7879_CMD_READ      BIT(2)
     23
     24static const struct regmap_config ad7879_spi_regmap_config = {
     25	.reg_bits = 16,
     26	.val_bits = 16,
     27	.max_register = 15,
     28	.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
     29	.write_flag_mask = AD7879_CMD_MAGIC,
     30};
     31
     32static int ad7879_spi_probe(struct spi_device *spi)
     33{
     34	struct regmap *regmap;
     35
     36	/* don't exceed max specified SPI CLK frequency */
     37	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
     38		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
     39		return -EINVAL;
     40	}
     41
     42	regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
     43	if (IS_ERR(regmap))
     44		return PTR_ERR(regmap);
     45
     46	return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
     47}
     48
     49#ifdef CONFIG_OF
     50static const struct of_device_id ad7879_spi_dt_ids[] = {
     51	{ .compatible = "adi,ad7879", },
     52	{ }
     53};
     54MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids);
     55#endif
     56
     57static struct spi_driver ad7879_spi_driver = {
     58	.driver = {
     59		.name	= "ad7879",
     60		.pm	= &ad7879_pm_ops,
     61		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
     62	},
     63	.probe		= ad7879_spi_probe,
     64};
     65
     66module_spi_driver(ad7879_spi_driver);
     67
     68MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
     69MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
     70MODULE_LICENSE("GPL");
     71MODULE_ALIAS("spi:ad7879");