1 /*
2  * Copyright 2018 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 #include "dce_i2c.h"
26 #include "reg_helper.h"
27 
dce_i2c_oem_device_present(struct resource_pool * pool,struct ddc_service * ddc,size_t slave_address)28 bool dce_i2c_oem_device_present(
29 	struct resource_pool *pool,
30 	struct ddc_service *ddc,
31 	size_t slave_address
32 )
33 {
34 	struct dc *dc = ddc->ctx->dc;
35 	struct dc_bios *dcb = dc->ctx->dc_bios;
36 	struct graphics_object_id id = {0};
37 	struct graphics_object_i2c_info i2c_info;
38 
39 	if (!dc->ctx->dc_bios->fw_info.oem_i2c_present)
40 		return false;
41 
42 	id.id = dc->ctx->dc_bios->fw_info.oem_i2c_obj_id;
43 	id.enum_id = 0;
44 	id.type = OBJECT_TYPE_GENERIC;
45 	if (dcb->funcs->get_i2c_info(dcb, id, &i2c_info) != BP_RESULT_OK)
46 		return false;
47 
48 	if (i2c_info.i2c_slave_address != slave_address)
49 		return false;
50 
51 	return true;
52 }
53 
dce_i2c_submit_command(struct resource_pool * pool,struct ddc * ddc,struct i2c_command * cmd)54 bool dce_i2c_submit_command(
55 	struct resource_pool *pool,
56 	struct ddc *ddc,
57 	struct i2c_command *cmd)
58 {
59 	struct dce_i2c_hw *dce_i2c_hw;
60 	struct dce_i2c_sw dce_i2c_sw = {0};
61 
62 	if (!ddc) {
63 		BREAK_TO_DEBUGGER();
64 		return false;
65 	}
66 
67 	if (!cmd) {
68 		BREAK_TO_DEBUGGER();
69 		return false;
70 	}
71 
72 	dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
73 
74 	if (dce_i2c_hw)
75 		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
76 
77 	dce_i2c_sw.ctx = ddc->ctx;
78 	if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
79 		return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
80 	}
81 
82 	return false;
83 }
84