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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zpa2326_i2c.c (2411B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Murata ZPA2326 I2C pressure and temperature sensor driver
      4 *
      5 * Copyright (c) 2016 Parrot S.A.
      6 *
      7 * Author: Gregor Boirie <gregor.boirie@parrot.com>
      8 */
      9
     10#include <linux/module.h>
     11#include <linux/regmap.h>
     12#include <linux/i2c.h>
     13#include <linux/mod_devicetable.h>
     14#include "zpa2326.h"
     15
     16/*
     17 * read_flag_mask:
     18 *   - address bit 7 must be set to request a register read operation
     19 */
     20static const struct regmap_config zpa2326_regmap_i2c_config = {
     21	.reg_bits       = 8,
     22	.val_bits       = 8,
     23	.writeable_reg  = zpa2326_isreg_writeable,
     24	.readable_reg   = zpa2326_isreg_readable,
     25	.precious_reg   = zpa2326_isreg_precious,
     26	.max_register   = ZPA2326_TEMP_OUT_H_REG,
     27	.read_flag_mask = BIT(7),
     28	.cache_type     = REGCACHE_NONE,
     29};
     30
     31static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
     32{
     33#define ZPA2326_SA0(_addr)          (_addr & BIT(0))
     34#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)
     35
     36	/* Identification register bit 1 mirrors device address bit 0. */
     37	return (ZPA2326_DEVICE_ID |
     38		(ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
     39}
     40
     41static int zpa2326_probe_i2c(struct i2c_client          *client,
     42			     const struct i2c_device_id *i2c_id)
     43{
     44	struct regmap *regmap;
     45
     46	regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
     47	if (IS_ERR(regmap)) {
     48		dev_err(&client->dev, "failed to init registers map");
     49		return PTR_ERR(regmap);
     50	}
     51
     52	return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
     53			     zpa2326_i2c_hwid(client), regmap);
     54}
     55
     56static int zpa2326_remove_i2c(struct i2c_client *client)
     57{
     58	zpa2326_remove(&client->dev);
     59
     60	return 0;
     61}
     62
     63static const struct i2c_device_id zpa2326_i2c_ids[] = {
     64	{ "zpa2326", 0 },
     65	{ },
     66};
     67MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
     68
     69static const struct of_device_id zpa2326_i2c_matches[] = {
     70	{ .compatible = "murata,zpa2326" },
     71	{ }
     72};
     73MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
     74
     75static struct i2c_driver zpa2326_i2c_driver = {
     76	.driver = {
     77		.name           = "zpa2326-i2c",
     78		.of_match_table = zpa2326_i2c_matches,
     79		.pm             = ZPA2326_PM_OPS,
     80	},
     81	.probe    = zpa2326_probe_i2c,
     82	.remove   = zpa2326_remove_i2c,
     83	.id_table = zpa2326_i2c_ids,
     84};
     85module_i2c_driver(zpa2326_i2c_driver);
     86
     87MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
     88MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
     89MODULE_LICENSE("GPL v2");
     90MODULE_IMPORT_NS(IIO_ZPA2326);