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 */
psb_intel_ddc_probe(struct psb_intel_output * psb_intel_output)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 */
psb_intel_ddc_get_modes(struct psb_intel_output * psb_intel_output)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 }
78