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
28bool 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
54bool 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: &dce_i2c_sw, ddc_handle: ddc)) {
79 return dce_i2c_submit_command_sw(pool, ddc, cmd, dce_i2c_sw: &dce_i2c_sw);
80 }
81
82 return false;
83}
84

source code of linux/drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c