1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2007 Intel Corporation |
4 | * |
5 | * Authers: Jesse Barnes <jesse.barnes@intel.com> |
6 | */ |
7 | |
8 | #include <linux/i2c.h> |
9 | |
10 | #include <drm/drm_edid.h> |
11 | |
12 | #include "psb_intel_drv.h" |
13 | |
14 | /** |
15 | * psb_intel_ddc_probe |
16 | * @adapter: Associated I2C adaptor |
17 | */ |
18 | bool psb_intel_ddc_probe(struct i2c_adapter *adapter) |
19 | { |
20 | u8 out_buf[] = { 0x0, 0x0 }; |
21 | u8 buf[2]; |
22 | int ret; |
23 | struct i2c_msg msgs[] = { |
24 | { |
25 | .addr = 0x50, |
26 | .flags = 0, |
27 | .len = 1, |
28 | .buf = out_buf, |
29 | }, |
30 | { |
31 | .addr = 0x50, |
32 | .flags = I2C_M_RD, |
33 | .len = 1, |
34 | .buf = buf, |
35 | } |
36 | }; |
37 | |
38 | ret = i2c_transfer(adap: adapter, msgs, num: 2); |
39 | if (ret == 2) |
40 | return true; |
41 | |
42 | return false; |
43 | } |
44 | |
45 | /** |
46 | * psb_intel_ddc_get_modes - get modelist from monitor |
47 | * @connector: DRM connector device to use |
48 | * @adapter: Associated I2C adaptor |
49 | * |
50 | * Fetch the EDID information from @connector using the DDC bus. |
51 | */ |
52 | int psb_intel_ddc_get_modes(struct drm_connector *connector, |
53 | struct i2c_adapter *adapter) |
54 | { |
55 | struct edid *edid; |
56 | int ret = 0; |
57 | |
58 | edid = drm_get_edid(connector, adapter); |
59 | if (edid) { |
60 | drm_connector_update_edid_property(connector, edid); |
61 | ret = drm_add_edid_modes(connector, edid); |
62 | kfree(objp: edid); |
63 | } |
64 | return ret; |
65 | } |
66 | |