drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c

Source file repositories/reference/linux-study-clean/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c
Extension
.c
Size
3607 bytes
Lines
131
Domain
Driver Families
Bucket
drivers/iio
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2020 InvenSense, Inc.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/property.h>

#include "inv_icm42600.h"

static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st)
{
	unsigned int mask, val;
	int ret;

	/*
	 * setup interface registers
	 * This register write to REG_INTF_CONFIG6 enables a spike filter that
	 * is impacting the line and can prevent the I2C ACK to be seen by the
	 * controller. So we don't test the return value.
	 */
	regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
			   INV_ICM42600_INTF_CONFIG6_MASK,
			   INV_ICM42600_INTF_CONFIG6_I3C_EN);

	ret = regmap_clear_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
				INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY);
	if (ret)
		return ret;

	/* set slew rates for I2C and SPI */
	mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
	       INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
	val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) |
	      INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS);
	ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
				 mask, val);
	if (ret)
		return ret;

	/* disable SPI bus */
	return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS);
}

static int inv_icm42600_probe(struct i2c_client *client)
{
	const void *match;
	enum inv_icm42600_chip chip;
	struct regmap *regmap;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
		return -ENOTSUPP;

	match = device_get_match_data(&client->dev);
	if (!match)
		return -EINVAL;
	chip = (uintptr_t)match;

	regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return inv_icm42600_core_probe(regmap, chip, inv_icm42600_i2c_bus_setup);
}

/*
 * device id table is used to identify what device can be
 * supported by this driver
 */
static const struct i2c_device_id inv_icm42600_id[] = {
	{ "icm42600", INV_CHIP_ICM42600 },
	{ "icm42602", INV_CHIP_ICM42602 },
	{ "icm42605", INV_CHIP_ICM42605 },
	{ "icm42686", INV_CHIP_ICM42686 },
	{ "icm42622", INV_CHIP_ICM42622 },
	{ "icm42688", INV_CHIP_ICM42688 },
	{ "icm42631", INV_CHIP_ICM42631 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, inv_icm42600_id);

static const struct of_device_id inv_icm42600_of_matches[] = {
	{

Annotation

Implementation Notes