drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c

/*
 * Copyright 2018 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */
#include "dce_i2c.h"
#include "reg_helper.h"

bool dce_i2c_oem_device_present(
	struct resource_pool *pool,
	struct ddc_service *ddc,
	size_t slave_address
)
{
	struct dc *dc = ddc->ctx->dc;
	struct dc_bios *dcb = dc->ctx->dc_bios;
	struct graphics_object_id id = {0};
	struct graphics_object_i2c_info i2c_info;

	if (!dc->ctx->dc_bios->fw_info.oem_i2c_present)
		return false;

	id.id = dc->ctx->dc_bios->fw_info.oem_i2c_obj_id;
	id.enum_id = 0;
	id.type = OBJECT_TYPE_GENERIC;
	if (dcb->funcs->get_i2c_info(dcb, id, &i2c_info) != BP_RESULT_OK)
		return false;

	if (i2c_info.i2c_slave_address != slave_address)
		return false;

	return true;
}

bool dce_i2c_submit_command(
	struct resource_pool *pool,
	struct ddc *ddc,
	struct i2c_command *cmd)
{
	struct dce_i2c_hw *dce_i2c_hw;
	struct dce_i2c_sw dce_i2c_sw = {0};

	if (!ddc) {
		BREAK_TO_DEBUGGER();
		return false;
	}

	if (!cmd) {
		BREAK_TO_DEBUGGER();
		return false;
	}

	dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);

	if (dce_i2c_hw)
		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);

	dce_i2c_sw.ctx = ddc->ctx;
	if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
		return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
	}

	return false;
}