drivers/gpu/drm/evdi/evdi_i2c.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2020 DisplayLink (UK) Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */

#include "evdi_i2c.h"
#include "evdi_debug.h"
#include "evdi_drv.h"

static int dli2c_access_master(struct i2c_adapter *adapter,
	struct i2c_msg *msgs, int num)
{
	int i = 0, result = 0;
	struct evdi_device *evdi = adapter->algo_data;

	for (i = 0; i < num; i++) {
		if (evdi_painter_i2c_data_notify(evdi, &msgs[i]))
			result++;
	}

	return result;
}

static u32 dli2c_func(__always_unused struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C;
}

static struct i2c_algorithm dli2c_algorithm = {
	.master_xfer = dli2c_access_master,
	.functionality = dli2c_func,
};

int evdi_i2c_add(struct i2c_adapter *adapter, struct device *parent,
	void *ddev)
{
	adapter->owner  = THIS_MODULE;
	adapter->class  = I2C_CLASS_DDC;
	adapter->algo   = &dli2c_algorithm;
	strcpy(adapter->name, "DisplayLink I2C Adapter");
	adapter->dev.parent = parent;
	adapter->algo_data = ddev;

	return i2c_add_adapter(adapter);
}

void evdi_i2c_remove(struct i2c_adapter *adapter)
{
	i2c_del_adapter(adapter);
}