1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2020 NVIDIA CORPORATION.  All rights reserved.
4 */
5
6#include <linux/host1x.h>
7#include <linux/module.h>
8#include <linux/platform_device.h>
9
10#include <media/v4l2-event.h>
11
12#include "video.h"
13
14static void tegra_v4l2_dev_release(struct v4l2_device *v4l2_dev)
15{
16	struct tegra_video_device *vid;
17
18	vid = container_of(v4l2_dev, struct tegra_video_device, v4l2_dev);
19
20	/* cleanup channels here as all video device nodes are released */
21	tegra_channels_cleanup(vid->vi);
22
23	v4l2_device_unregister(v4l2_dev);
24	media_device_unregister(&vid->media_dev);
25	media_device_cleanup(&vid->media_dev);
26	kfree(vid);
27}
28
29static void tegra_v4l2_dev_notify(struct v4l2_subdev *sd,
30				  unsigned int notification, void *arg)
31{
32	struct tegra_vi_channel *chan;
33	const struct v4l2_event *ev = arg;
34
35	if (notification != V4L2_DEVICE_NOTIFY_EVENT)
36		return;
37
38	chan = v4l2_get_subdev_hostdata(sd);
39	v4l2_event_queue(&chan->video, arg);
40	if (ev->type == V4L2_EVENT_SOURCE_CHANGE && vb2_is_streaming(&chan->queue))
41		vb2_queue_error(&chan->queue);
42}
43
44static int host1x_video_probe(struct host1x_device *dev)
45{
46	struct tegra_video_device *vid;
47	int ret;
48
49	vid = kzalloc(sizeof(*vid), GFP_KERNEL);
50	if (!vid)
51		return -ENOMEM;
52
53	dev_set_drvdata(&dev->dev, vid);
54
55	vid->media_dev.dev = &dev->dev;
56	strscpy(vid->media_dev.model, "NVIDIA Tegra Video Input Device",
57		sizeof(vid->media_dev.model));
58
59	media_device_init(&vid->media_dev);
60	ret = media_device_register(&vid->media_dev);
61	if (ret < 0) {
62		dev_err(&dev->dev,
63			"failed to register media device: %d\n", ret);
64		goto cleanup;
65	}
66
67	vid->v4l2_dev.mdev = &vid->media_dev;
68	vid->v4l2_dev.release = tegra_v4l2_dev_release;
69	vid->v4l2_dev.notify = tegra_v4l2_dev_notify;
70	ret = v4l2_device_register(&dev->dev, &vid->v4l2_dev);
71	if (ret < 0) {
72		dev_err(&dev->dev,
73			"V4L2 device registration failed: %d\n", ret);
74		goto unregister_media;
75	}
76
77	ret = host1x_device_init(dev);
78	if (ret < 0)
79		goto unregister_v4l2;
80
81	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) {
82		/*
83		 * Both vi and csi channels are available now.
84		 * Register v4l2 nodes and create media links for TPG.
85		 */
86		ret = tegra_v4l2_nodes_setup_tpg(vid);
87		if (ret < 0) {
88			dev_err(&dev->dev,
89				"failed to setup tpg graph: %d\n", ret);
90			goto device_exit;
91		}
92	}
93
94	return 0;
95
96device_exit:
97	host1x_device_exit(dev);
98	/* vi exit ops does not clean channels, so clean them here */
99	tegra_channels_cleanup(vid->vi);
100unregister_v4l2:
101	v4l2_device_unregister(&vid->v4l2_dev);
102unregister_media:
103	media_device_unregister(&vid->media_dev);
104cleanup:
105	media_device_cleanup(&vid->media_dev);
106	kfree(vid);
107	return ret;
108}
109
110static int host1x_video_remove(struct host1x_device *dev)
111{
112	struct tegra_video_device *vid = dev_get_drvdata(&dev->dev);
113
114	if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
115		tegra_v4l2_nodes_cleanup_tpg(vid);
116
117	host1x_device_exit(dev);
118
119	/* This calls v4l2_dev release callback on last reference */
120	v4l2_device_put(&vid->v4l2_dev);
121
122	return 0;
123}
124
125static const struct of_device_id host1x_video_subdevs[] = {
126#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
127	{ .compatible = "nvidia,tegra20-vip", },
128	{ .compatible = "nvidia,tegra20-vi", },
129#endif
130#if defined(CONFIG_ARCH_TEGRA_210_SOC)
131	{ .compatible = "nvidia,tegra210-csi", },
132	{ .compatible = "nvidia,tegra210-vi", },
133#endif
134	{ }
135};
136
137static struct host1x_driver host1x_video_driver = {
138	.driver = {
139		.name = "tegra-video",
140	},
141	.probe = host1x_video_probe,
142	.remove = host1x_video_remove,
143	.subdevs = host1x_video_subdevs,
144};
145
146static struct platform_driver * const drivers[] = {
147	&tegra_csi_driver,
148	&tegra_vip_driver,
149	&tegra_vi_driver,
150};
151
152static int __init host1x_video_init(void)
153{
154	int err;
155
156	err = host1x_driver_register(&host1x_video_driver);
157	if (err < 0)
158		return err;
159
160	err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
161	if (err < 0)
162		goto unregister_host1x;
163
164	return 0;
165
166unregister_host1x:
167	host1x_driver_unregister(&host1x_video_driver);
168	return err;
169}
170module_init(host1x_video_init);
171
172static void __exit host1x_video_exit(void)
173{
174	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
175	host1x_driver_unregister(&host1x_video_driver);
176}
177module_exit(host1x_video_exit);
178
179MODULE_AUTHOR("Sowjanya Komatineni <skomatineni@nvidia.com>");
180MODULE_DESCRIPTION("NVIDIA Tegra Host1x Video driver");
181MODULE_LICENSE("GPL v2");
182