linux/drivers/i2c/busses/i2c-kempld.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * I2C bus driver for Kontron COM modules
 *
 * Copyright (c) 2010-2013 Kontron Europe GmbH
 * Author: Michael Brunner <[email protected]>
 *
 * The driver is based on the i2c-ocores driver by Peter Korsgaard.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/kempld.h>

#define KEMPLD_I2C_PRELOW …
#define KEMPLD_I2C_PREHIGH …
#define KEMPLD_I2C_DATA …

#define KEMPLD_I2C_CTRL …
#define I2C_CTRL_IEN …
#define I2C_CTRL_EN …

#define KEMPLD_I2C_STAT …
#define I2C_STAT_IF …
#define I2C_STAT_TIP …
#define I2C_STAT_ARBLOST …
#define I2C_STAT_BUSY …
#define I2C_STAT_NACK …

#define KEMPLD_I2C_CMD …
#define I2C_CMD_START …
#define I2C_CMD_STOP …
#define I2C_CMD_READ …
#define I2C_CMD_WRITE …
#define I2C_CMD_READ_ACK …
#define I2C_CMD_READ_NACK …
#define I2C_CMD_IACK …

#define KEMPLD_I2C_FREQ_MAX …
#define KEMPLD_I2C_FREQ_STD …

enum { … };

struct kempld_i2c_data { … };

static unsigned int bus_frequency = …;
module_param(bus_frequency, uint, 0);
MODULE_PARM_DESC(…) …;

static int i2c_bus = …;
module_param(i2c_bus, int, 0);
MODULE_PARM_DESC(…) …;

static bool i2c_gpio_mux;
module_param(i2c_gpio_mux, bool, 0);
MODULE_PARM_DESC(…) …;

/*
 * kempld_get_mutex must be called prior to calling this function.
 */
static int kempld_i2c_process(struct kempld_i2c_data *i2c)
{ … }

static int kempld_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
				int num)
{ … }

/*
 * kempld_get_mutex must be called prior to calling this function.
 */
static void kempld_i2c_device_init(struct kempld_i2c_data *i2c)
{ … }

static u32 kempld_i2c_func(struct i2c_adapter *adap)
{ … }

static const struct i2c_algorithm kempld_i2c_algorithm = …;

static const struct i2c_adapter kempld_i2c_adapter = …;

static int kempld_i2c_probe(struct platform_device *pdev)
{ … }

static void kempld_i2c_remove(struct platform_device *pdev)
{ … }

static int kempld_i2c_suspend(struct device *dev)
{ … }

static int kempld_i2c_resume(struct device *dev)
{ … }

static DEFINE_SIMPLE_DEV_PM_OPS(kempld_i2c_pm_ops,
				kempld_i2c_suspend, kempld_i2c_resume);

static struct platform_driver kempld_i2c_driver = …;

module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;
MODULE_ALIAS(…) …;