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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mpu3050-i2c.c (3196B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2#include <linux/err.h>
      3#include <linux/i2c.h>
      4#include <linux/i2c-mux.h>
      5#include <linux/iio/iio.h>
      6#include <linux/module.h>
      7#include <linux/regmap.h>
      8#include <linux/pm_runtime.h>
      9
     10#include "mpu3050.h"
     11
     12static const struct regmap_config mpu3050_i2c_regmap_config = {
     13	.reg_bits = 8,
     14	.val_bits = 8,
     15};
     16
     17static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
     18{
     19	struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
     20
     21	/* Just power up the device, that is all that is needed */
     22	pm_runtime_get_sync(mpu3050->dev);
     23	return 0;
     24}
     25
     26static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
     27{
     28	struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
     29
     30	pm_runtime_mark_last_busy(mpu3050->dev);
     31	pm_runtime_put_autosuspend(mpu3050->dev);
     32	return 0;
     33}
     34
     35static int mpu3050_i2c_probe(struct i2c_client *client,
     36			     const struct i2c_device_id *id)
     37{
     38	struct regmap *regmap;
     39	const char *name;
     40	struct mpu3050 *mpu3050;
     41	int ret;
     42
     43	if (!i2c_check_functionality(client->adapter,
     44				     I2C_FUNC_SMBUS_I2C_BLOCK))
     45		return -EOPNOTSUPP;
     46
     47	if (id)
     48		name = id->name;
     49	else
     50		return -ENODEV;
     51
     52	regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config);
     53	if (IS_ERR(regmap)) {
     54		dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
     55			regmap);
     56		return PTR_ERR(regmap);
     57	}
     58
     59	ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name);
     60	if (ret)
     61		return ret;
     62
     63	/* The main driver is up, now register the I2C mux */
     64	mpu3050 = iio_priv(dev_get_drvdata(&client->dev));
     65	mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev,
     66					1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
     67					mpu3050_i2c_bypass_select,
     68					mpu3050_i2c_bypass_deselect);
     69	/* Just fail the mux, there is no point in killing the driver */
     70	if (!mpu3050->i2cmux)
     71		dev_err(&client->dev, "failed to allocate I2C mux\n");
     72	else {
     73		mpu3050->i2cmux->priv = mpu3050;
     74		/* Ignore failure, not critical */
     75		i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0, 0);
     76	}
     77
     78	return 0;
     79}
     80
     81static int mpu3050_i2c_remove(struct i2c_client *client)
     82{
     83	struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
     84	struct mpu3050 *mpu3050 = iio_priv(indio_dev);
     85
     86	if (mpu3050->i2cmux)
     87		i2c_mux_del_adapters(mpu3050->i2cmux);
     88
     89	mpu3050_common_remove(&client->dev);
     90
     91	return 0;
     92}
     93
     94/*
     95 * device id table is used to identify what device can be
     96 * supported by this driver
     97 */
     98static const struct i2c_device_id mpu3050_i2c_id[] = {
     99	{ "mpu3050" },
    100	{}
    101};
    102MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id);
    103
    104static const struct of_device_id mpu3050_i2c_of_match[] = {
    105	{ .compatible = "invensense,mpu3050", .data = "mpu3050" },
    106	/* Deprecated vendor ID from the Input driver */
    107	{ .compatible = "invn,mpu3050", .data = "mpu3050" },
    108	{ },
    109};
    110MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match);
    111
    112static struct i2c_driver mpu3050_i2c_driver = {
    113	.probe = mpu3050_i2c_probe,
    114	.remove = mpu3050_i2c_remove,
    115	.id_table = mpu3050_i2c_id,
    116	.driver = {
    117		.of_match_table = mpu3050_i2c_of_match,
    118		.name = "mpu3050-i2c",
    119		.pm = &mpu3050_dev_pm_ops,
    120	},
    121};
    122module_i2c_driver(mpu3050_i2c_driver);
    123
    124MODULE_AUTHOR("Linus Walleij");
    125MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver");
    126MODULE_LICENSE("GPL");