1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2014 Google Inc.
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <display.h>
9 #include <edid.h>
10 #include <errno.h>
11 
12 int display_read_edid(struct udevice *dev, u8 *buf, int buf_size)
13 {
14 	struct dm_display_ops *ops = display_get_ops(dev);
15 
16 	if (!ops || !ops->read_edid)
17 		return -ENOSYS;
18 	return ops->read_edid(dev, buf, buf_size);
19 }
20 
21 int display_enable(struct udevice *dev, int panel_bpp,
22 			const struct display_timing *timing)
23 {
24 	struct dm_display_ops *ops = display_get_ops(dev);
25 	struct display_plat *disp_uc_plat;
26 	int ret;
27 
28 	if (!ops || !ops->enable)
29 		return -ENOSYS;
30 	ret = ops->enable(dev, panel_bpp, timing);
31 	if (ret)
32 		return ret;
33 
34 	disp_uc_plat = dev_get_uclass_platdata(dev);
35 	disp_uc_plat->in_use = true;
36 
37 	return 0;
38 }
39 
40 int display_read_timing(struct udevice *dev, struct display_timing *timing)
41 {
42 	struct dm_display_ops *ops = display_get_ops(dev);
43 	int panel_bits_per_colour;
44 	u8 buf[EDID_EXT_SIZE];
45 	int ret;
46 
47 	if (ops && ops->read_timing)
48 		return ops->read_timing(dev, timing);
49 
50 	if (!ops || !ops->read_edid)
51 		return -ENOSYS;
52 	ret = ops->read_edid(dev, buf, sizeof(buf));
53 	if (ret < 0)
54 		return ret;
55 
56 	return edid_get_timing(buf, ret, timing, &panel_bits_per_colour);
57 }
58 
59 bool display_in_use(struct udevice *dev)
60 {
61 	struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
62 
63 	return disp_uc_plat->in_use;
64 }
65 
66 UCLASS_DRIVER(display) = {
67 	.id		= UCLASS_DISPLAY,
68 	.name		= "display",
69 	.per_device_platdata_auto_alloc_size	= sizeof(struct display_plat),
70 };
71