1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7#define LOG_CATEGORY UCLASS_VIDEO_BRIDGE
8
9#include <common.h>
10#include <dm.h>
11#include <errno.h>
12#include <edid.h>
13#include <log.h>
14#include <video_bridge.h>
15#include <linux/delay.h>
16
17int video_bridge_set_backlight(struct udevice *dev, int percent)
18{
19	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
20
21	if (!ops->set_backlight)
22		return -ENOSYS;
23
24	return ops->set_backlight(dev, percent);
25}
26
27int video_bridge_attach(struct udevice *dev)
28{
29	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
30
31	if (!ops->attach)
32		return -ENOSYS;
33
34	return ops->attach(dev);
35}
36
37int video_bridge_check_attached(struct udevice *dev)
38{
39	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
40	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
41	int ret;
42
43	if (!ops->check_attached) {
44		ret = dm_gpio_get_value(&uc_priv->hotplug);
45
46		return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
47	}
48
49	return ops->check_attached(dev);
50}
51
52int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size)
53{
54	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
55
56	if (!ops || !ops->read_edid)
57		return -ENOSYS;
58	return ops->read_edid(dev, buf, buf_size);
59}
60
61static int video_bridge_pre_probe(struct udevice *dev)
62{
63	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
64	int ret;
65
66	debug("%s\n", __func__);
67	ret = gpio_request_by_name(dev, "sleep-gpios", 0,
68				   &uc_priv->sleep, GPIOD_IS_OUT);
69	if (ret) {
70		debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
71		if (ret != -ENOENT)
72			return ret;
73	}
74	/*
75	 * Drop this for now as we do not have driver model pinctrl support
76	 *
77	 * ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
78	 * if (ret) {
79	 *	debug("%s: Could not set sleep pull value\n", __func__);
80	 *	return ret;
81	 * }
82	 */
83	ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
84				   GPIOD_IS_OUT);
85	if (ret) {
86		debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
87		if (ret != -ENOENT)
88			return ret;
89	}
90	/*
91	 * Drop this for now as we do not have driver model pinctrl support
92	 *
93	 * ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
94	 * if (ret) {
95	 *	debug("%s: Could not set reset pull value\n", __func__);
96	 *	return ret;
97	 * }
98	 */
99	ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
100				   GPIOD_IS_IN);
101	if (ret) {
102		debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
103		if (ret != -ENOENT)
104			return ret;
105	}
106
107	return 0;
108}
109
110int video_bridge_set_active(struct udevice *dev, bool active)
111{
112	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
113	int ret = 0;
114
115	debug("%s: %d\n", __func__, active);
116	if (uc_priv->sleep.dev) {
117		ret = dm_gpio_set_value(&uc_priv->sleep, !active);
118		if (ret)
119			return ret;
120	}
121
122	if (!active)
123		return 0;
124
125	if (uc_priv->reset.dev) {
126		ret = dm_gpio_set_value(&uc_priv->reset, true);
127		if (ret)
128			return ret;
129		udelay(10);
130		ret = dm_gpio_set_value(&uc_priv->reset, false);
131	}
132
133	return ret;
134}
135
136UCLASS_DRIVER(video_bridge) = {
137	.id		= UCLASS_VIDEO_BRIDGE,
138	.name		= "video_bridge",
139	.per_device_auto	= sizeof(struct video_bridge_priv),
140	.pre_probe	= video_bridge_pre_probe,
141};
142