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0867b421 AC |
1 | /* |
2 | * Copyright (c) 2007 Intel Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Authers: Jesse Barnes <jesse.barnes@intel.com> | |
18 | */ | |
19 | ||
20 | #include <linux/i2c.h> | |
21 | #include <linux/fb.h> | |
22 | #include <drm/drmP.h> | |
23 | #include "psb_intel_drv.h" | |
24 | ||
25 | /** | |
26 | * psb_intel_ddc_probe | |
27 | * | |
28 | */ | |
29 | bool psb_intel_ddc_probe(struct psb_intel_output *psb_intel_output) | |
30 | { | |
31 | u8 out_buf[] = { 0x0, 0x0 }; | |
32 | u8 buf[2]; | |
33 | int ret; | |
34 | struct i2c_msg msgs[] = { | |
35 | { | |
36 | .addr = 0x50, | |
37 | .flags = 0, | |
38 | .len = 1, | |
39 | .buf = out_buf, | |
40 | }, | |
41 | { | |
42 | .addr = 0x50, | |
43 | .flags = I2C_M_RD, | |
44 | .len = 1, | |
45 | .buf = buf, | |
46 | } | |
47 | }; | |
48 | ||
49 | ret = i2c_transfer(&psb_intel_output->ddc_bus->adapter, msgs, 2); | |
50 | if (ret == 2) | |
51 | return true; | |
52 | ||
53 | return false; | |
54 | } | |
55 | ||
56 | /** | |
57 | * psb_intel_ddc_get_modes - get modelist from monitor | |
58 | * @connector: DRM connector device to use | |
59 | * | |
60 | * Fetch the EDID information from @connector using the DDC bus. | |
61 | */ | |
62 | int psb_intel_ddc_get_modes(struct psb_intel_output *psb_intel_output) | |
63 | { | |
64 | struct edid *edid; | |
65 | int ret = 0; | |
66 | ||
67 | edid = | |
68 | drm_get_edid(&psb_intel_output->base, | |
69 | &psb_intel_output->ddc_bus->adapter); | |
70 | if (edid) { | |
71 | drm_mode_connector_update_edid_property(&psb_intel_output-> | |
72 | base, edid); | |
73 | ret = drm_add_edid_modes(&psb_intel_output->base, edid); | |
74 | kfree(edid); | |
75 | } | |
76 | return ret; | |
77 | } |