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 <drm/drmP.h>
22#include "psb_intel_drv.h"
23
24/**
25 * psb_intel_ddc_probe
26 *
27 */
28bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
29{
30	u8 out_buf[] = { 0x0, 0x0 };
31	u8 buf[2];
32	int ret;
33	struct i2c_msg msgs[] = {
34		{
35		 .addr = 0x50,
36		 .flags = 0,
37		 .len = 1,
38		 .buf = out_buf,
39		 },
40		{
41		 .addr = 0x50,
42		 .flags = I2C_M_RD,
43		 .len = 1,
44		 .buf = buf,
45		 }
46	};
47
48	ret = i2c_transfer(adapter, msgs, 2);
49	if (ret == 2)
50		return true;
51
52	return false;
53}
54
55/**
56 * psb_intel_ddc_get_modes - get modelist from monitor
57 * @connector: DRM connector device to use
58 *
59 * Fetch the EDID information from @connector using the DDC bus.
60 */
61int psb_intel_ddc_get_modes(struct drm_connector *connector,
62			    struct i2c_adapter *adapter)
63{
64	struct edid *edid;
65	int ret = 0;
66
67	edid = drm_get_edid(connector, adapter);
68	if (edid) {
69		drm_mode_connector_update_edid_property(connector, edid);
70		ret = drm_add_edid_modes(connector, edid);
71		kfree(edid);
72	}
73	return ret;
74}