1 /*
2 * Copyright (C) 2014 Traphandler
3 * Copyright (C) 2014 Free Electrons
4 * Copyright (C) 2014 Atmel
5 *
6 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
7 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published by
11 * the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include <linux/of_graph.h>
23
24 #include <drm/drmP.h>
25 #include <drm/drm_of.h>
26 #include <drm/drm_bridge.h>
27
28 #include "atmel_hlcdc_dc.h"
29
30 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
31 .destroy = drm_encoder_cleanup,
32 };
33
atmel_hlcdc_attach_endpoint(struct drm_device * dev,int endpoint)34 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
35 {
36 struct drm_encoder *encoder;
37 struct drm_panel *panel;
38 struct drm_bridge *bridge;
39 int ret;
40
41 ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
42 &panel, &bridge);
43 if (ret)
44 return ret;
45
46 encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
47 if (!encoder)
48 return -EINVAL;
49
50 ret = drm_encoder_init(dev, encoder,
51 &atmel_hlcdc_panel_encoder_funcs,
52 DRM_MODE_ENCODER_NONE, NULL);
53 if (ret)
54 return ret;
55
56 encoder->possible_crtcs = 0x1;
57
58 if (panel) {
59 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
60 if (IS_ERR(bridge))
61 return PTR_ERR(bridge);
62 }
63
64 if (bridge) {
65 ret = drm_bridge_attach(encoder, bridge, NULL);
66 if (!ret)
67 return 0;
68
69 if (panel)
70 drm_panel_bridge_remove(bridge);
71 }
72
73 drm_encoder_cleanup(encoder);
74
75 return ret;
76 }
77
atmel_hlcdc_create_outputs(struct drm_device * dev)78 int atmel_hlcdc_create_outputs(struct drm_device *dev)
79 {
80 int endpoint, ret = 0;
81
82 for (endpoint = 0; !ret; endpoint++)
83 ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
84
85 /* At least one device was successfully attached.*/
86 if (ret == -ENODEV && endpoint)
87 return 0;
88
89 return ret;
90 }
91
