cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

inv_icm42600_i2c.c (2868B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright (C) 2020 InvenSense, Inc.
      4 */
      5
      6#include <linux/kernel.h>
      7#include <linux/device.h>
      8#include <linux/module.h>
      9#include <linux/mod_devicetable.h>
     10#include <linux/i2c.h>
     11#include <linux/regmap.h>
     12#include <linux/property.h>
     13
     14#include "inv_icm42600.h"
     15
     16static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st)
     17{
     18	unsigned int mask, val;
     19	int ret;
     20
     21	/*
     22	 * setup interface registers
     23	 * This register write to REG_INTF_CONFIG6 enables a spike filter that
     24	 * is impacting the line and can prevent the I2C ACK to be seen by the
     25	 * controller. So we don't test the return value.
     26	 */
     27	regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
     28			   INV_ICM42600_INTF_CONFIG6_MASK,
     29			   INV_ICM42600_INTF_CONFIG6_I3C_EN);
     30
     31	ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
     32				 INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
     33	if (ret)
     34		return ret;
     35
     36	/* set slew rates for I2C and SPI */
     37	mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
     38	       INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
     39	val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) |
     40	      INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS);
     41	ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
     42				 mask, val);
     43	if (ret)
     44		return ret;
     45
     46	/* disable SPI bus */
     47	return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
     48				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
     49				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS);
     50}
     51
     52static int inv_icm42600_probe(struct i2c_client *client)
     53{
     54	const void *match;
     55	enum inv_icm42600_chip chip;
     56	struct regmap *regmap;
     57
     58	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
     59		return -ENOTSUPP;
     60
     61	match = device_get_match_data(&client->dev);
     62	if (!match)
     63		return -EINVAL;
     64	chip = (uintptr_t)match;
     65
     66	regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config);
     67	if (IS_ERR(regmap))
     68		return PTR_ERR(regmap);
     69
     70	return inv_icm42600_core_probe(regmap, chip, client->irq,
     71				       inv_icm42600_i2c_bus_setup);
     72}
     73
     74static const struct of_device_id inv_icm42600_of_matches[] = {
     75	{
     76		.compatible = "invensense,icm42600",
     77		.data = (void *)INV_CHIP_ICM42600,
     78	}, {
     79		.compatible = "invensense,icm42602",
     80		.data = (void *)INV_CHIP_ICM42602,
     81	}, {
     82		.compatible = "invensense,icm42605",
     83		.data = (void *)INV_CHIP_ICM42605,
     84	}, {
     85		.compatible = "invensense,icm42622",
     86		.data = (void *)INV_CHIP_ICM42622,
     87	},
     88	{}
     89};
     90MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
     91
     92static struct i2c_driver inv_icm42600_driver = {
     93	.driver = {
     94		.name = "inv-icm42600-i2c",
     95		.of_match_table = inv_icm42600_of_matches,
     96		.pm = &inv_icm42600_pm_ops,
     97	},
     98	.probe_new = inv_icm42600_probe,
     99};
    100module_i2c_driver(inv_icm42600_driver);
    101
    102MODULE_AUTHOR("InvenSense, Inc.");
    103MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver");
    104MODULE_LICENSE("GPL");