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-i2c.c (1746B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * AD7879-1/AD7889-1 touchscreen (I2C bus)
      4 *
      5 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
      6 */
      7
      8#include <linux/input.h>	/* BUS_I2C */
      9#include <linux/i2c.h>
     10#include <linux/module.h>
     11#include <linux/types.h>
     12#include <linux/of.h>
     13#include <linux/pm.h>
     14#include <linux/regmap.h>
     15
     16#include "ad7879.h"
     17
     18#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
     19
     20static const struct regmap_config ad7879_i2c_regmap_config = {
     21	.reg_bits = 8,
     22	.val_bits = 16,
     23	.max_register = 15,
     24};
     25
     26static int ad7879_i2c_probe(struct i2c_client *client,
     27				      const struct i2c_device_id *id)
     28{
     29	struct regmap *regmap;
     30
     31	if (!i2c_check_functionality(client->adapter,
     32				     I2C_FUNC_SMBUS_WORD_DATA)) {
     33		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
     34		return -EIO;
     35	}
     36
     37	regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
     38	if (IS_ERR(regmap))
     39		return PTR_ERR(regmap);
     40
     41	return ad7879_probe(&client->dev, regmap, client->irq,
     42			    BUS_I2C, AD7879_DEVID);
     43}
     44
     45static const struct i2c_device_id ad7879_id[] = {
     46	{ "ad7879", 0 },
     47	{ "ad7889", 0 },
     48	{ }
     49};
     50MODULE_DEVICE_TABLE(i2c, ad7879_id);
     51
     52#ifdef CONFIG_OF
     53static const struct of_device_id ad7879_i2c_dt_ids[] = {
     54	{ .compatible = "adi,ad7879-1", },
     55	{ }
     56};
     57MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
     58#endif
     59
     60static struct i2c_driver ad7879_i2c_driver = {
     61	.driver = {
     62		.name	= "ad7879",
     63		.pm	= &ad7879_pm_ops,
     64		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
     65	},
     66	.probe		= ad7879_i2c_probe,
     67	.id_table	= ad7879_id,
     68};
     69
     70module_i2c_driver(ad7879_i2c_driver);
     71
     72MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
     73MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
     74MODULE_LICENSE("GPL");