mpu3050-i2c.c

  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	return pm_runtime_resume_and_get(mpu3050->dev);
 23}
 24
 25static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 26{
 27	struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
 28
 29	pm_runtime_put_autosuspend(mpu3050->dev);
 30	return 0;
 31}
 32
 33static int mpu3050_i2c_probe(struct i2c_client *client)
 34{
 35	const struct i2c_device_id *id = i2c_client_get_device_id(client);
 36	struct regmap *regmap;
 37	const char *name;
 38	struct mpu3050 *mpu3050;
 39	int ret;
 40
 41	if (!i2c_check_functionality(client->adapter,
 42				     I2C_FUNC_SMBUS_I2C_BLOCK))
 43		return -EOPNOTSUPP;
 44
 45	if (id)
 46		name = id->name;
 47	else
 48		return -ENODEV;
 49
 50	regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config);
 51	if (IS_ERR(regmap)) {
 52		dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
 53			regmap);
 54		return PTR_ERR(regmap);
 55	}
 56
 57	ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name);
 58	if (ret)
 59		return ret;
 60
 61	/* The main driver is up, now register the I2C mux */
 62	mpu3050 = iio_priv(dev_get_drvdata(&client->dev));
 63	mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev,
 64					1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
 65					mpu3050_i2c_bypass_select,
 66					mpu3050_i2c_bypass_deselect);
 67	/* Just fail the mux, there is no point in killing the driver */
 68	if (!mpu3050->i2cmux)
 69		dev_err(&client->dev, "failed to allocate I2C mux\n");
 70	else {
 71		mpu3050->i2cmux->priv = mpu3050;
 72		/* Ignore failure, not critical */
 73		i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0);
 74	}
 75
 76	return 0;
 77}
 78
 79static void mpu3050_i2c_remove(struct i2c_client *client)
 80{
 81	struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
 82	struct mpu3050 *mpu3050 = iio_priv(indio_dev);
 83
 84	if (mpu3050->i2cmux)
 85		i2c_mux_del_adapters(mpu3050->i2cmux);
 86
 87	mpu3050_common_remove(&client->dev);
 88}
 89
 90/*
 91 * device id table is used to identify what device can be
 92 * supported by this driver
 93 */
 94static const struct i2c_device_id mpu3050_i2c_id[] = {
 95	{ "mpu3050" },
 96	{ }
 97};
 98MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id);
 99
100static const struct of_device_id mpu3050_i2c_of_match[] = {
101	{ .compatible = "invensense,mpu3050", .data = "mpu3050" },
102	/* Deprecated vendor ID from the Input driver */
103	{ .compatible = "invn,mpu3050", .data = "mpu3050" },
104	{ }
105};
106MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match);
107
108static struct i2c_driver mpu3050_i2c_driver = {
109	.probe = mpu3050_i2c_probe,
110	.remove = mpu3050_i2c_remove,
111	.id_table = mpu3050_i2c_id,
112	.driver = {
113		.of_match_table = mpu3050_i2c_of_match,
114		.name = "mpu3050-i2c",
115		.pm = pm_ptr(&mpu3050_dev_pm_ops),
116	},
117};
118module_i2c_driver(mpu3050_i2c_driver);
119
120MODULE_AUTHOR("Linus Walleij");
121MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver");
122MODULE_LICENSE("GPL");