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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * uvc_v4l2.c -- USB Video Class Gadget driver
4 *
5 * Copyright (C) 2009-2010
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 */
8
9#include <linux/device.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/usb/g_uvc.h>
14#include <linux/videodev2.h>
15#include <linux/vmalloc.h>
16#include <linux/wait.h>
17
18#include <media/v4l2-dev.h>
19#include <media/v4l2-event.h>
20#include <media/v4l2-ioctl.h>
21
22#include "f_uvc.h"
23#include "uvc.h"
24#include "uvc_queue.h"
25#include "uvc_video.h"
26#include "uvc_v4l2.h"
27
28/* --------------------------------------------------------------------------
29 * Requests handling
30 */
31
32static int
33uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
34{
35 struct usb_composite_dev *cdev = uvc->func.config->cdev;
36 struct usb_request *req = uvc->control_req;
37
38 if (data->length < 0)
39 return usb_ep_set_halt(cdev->gadget->ep0);
40
41 req->length = min_t(unsigned int, uvc->event_length, data->length);
42 req->zero = data->length < uvc->event_length;
43
44 memcpy(req->buf, data->data, req->length);
45
46 return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
47}
48
49/* --------------------------------------------------------------------------
50 * V4L2 ioctls
51 */
52
53struct uvc_format {
54 u8 bpp;
55 u32 fcc;
56};
57
58static struct uvc_format uvc_formats[] = {
59 { 16, V4L2_PIX_FMT_YUYV },
60 { 0, V4L2_PIX_FMT_MJPEG },
61};
62
63static int
64uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
65{
66 struct video_device *vdev = video_devdata(file);
67 struct uvc_device *uvc = video_get_drvdata(vdev);
68 struct usb_composite_dev *cdev = uvc->func.config->cdev;
69
70 strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
71 strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
72 strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
73 sizeof(cap->bus_info));
74 return 0;
75}
76
77static int
78uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
79{
80 struct video_device *vdev = video_devdata(file);
81 struct uvc_device *uvc = video_get_drvdata(vdev);
82 struct uvc_video *video = &uvc->video;
83
84 fmt->fmt.pix.pixelformat = video->fcc;
85 fmt->fmt.pix.width = video->width;
86 fmt->fmt.pix.height = video->height;
87 fmt->fmt.pix.field = V4L2_FIELD_NONE;
88 fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
89 fmt->fmt.pix.sizeimage = video->imagesize;
90 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
91 fmt->fmt.pix.priv = 0;
92
93 return 0;
94}
95
96static int
97uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
98{
99 struct video_device *vdev = video_devdata(file);
100 struct uvc_device *uvc = video_get_drvdata(vdev);
101 struct uvc_video *video = &uvc->video;
102 struct uvc_format *format;
103 unsigned int imagesize;
104 unsigned int bpl;
105 unsigned int i;
106
107 for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
108 format = &uvc_formats[i];
109 if (format->fcc == fmt->fmt.pix.pixelformat)
110 break;
111 }
112
113 if (i == ARRAY_SIZE(uvc_formats)) {
114 uvcg_info(&uvc->func, "Unsupported format 0x%08x.\n",
115 fmt->fmt.pix.pixelformat);
116 return -EINVAL;
117 }
118
119 bpl = format->bpp * fmt->fmt.pix.width / 8;
120 imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
121
122 video->fcc = format->fcc;
123 video->bpp = format->bpp;
124 video->width = fmt->fmt.pix.width;
125 video->height = fmt->fmt.pix.height;
126 video->imagesize = imagesize;
127
128 fmt->fmt.pix.field = V4L2_FIELD_NONE;
129 fmt->fmt.pix.bytesperline = bpl;
130 fmt->fmt.pix.sizeimage = imagesize;
131 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
132 fmt->fmt.pix.priv = 0;
133
134 return 0;
135}
136
137static int
138uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
139{
140 struct video_device *vdev = video_devdata(file);
141 struct uvc_device *uvc = video_get_drvdata(vdev);
142 struct uvc_video *video = &uvc->video;
143
144 if (b->type != video->queue.queue.type)
145 return -EINVAL;
146
147 return uvcg_alloc_buffers(&video->queue, b);
148}
149
150static int
151uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
152{
153 struct video_device *vdev = video_devdata(file);
154 struct uvc_device *uvc = video_get_drvdata(vdev);
155 struct uvc_video *video = &uvc->video;
156
157 return uvcg_query_buffer(&video->queue, b);
158}
159
160static int
161uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
162{
163 struct video_device *vdev = video_devdata(file);
164 struct uvc_device *uvc = video_get_drvdata(vdev);
165 struct uvc_video *video = &uvc->video;
166 int ret;
167
168 ret = uvcg_queue_buffer(&video->queue, b);
169 if (ret < 0)
170 return ret;
171
172 return uvcg_video_pump(video);
173}
174
175static int
176uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
177{
178 struct video_device *vdev = video_devdata(file);
179 struct uvc_device *uvc = video_get_drvdata(vdev);
180 struct uvc_video *video = &uvc->video;
181
182 return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
183}
184
185static int
186uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
187{
188 struct video_device *vdev = video_devdata(file);
189 struct uvc_device *uvc = video_get_drvdata(vdev);
190 struct uvc_video *video = &uvc->video;
191 int ret;
192
193 if (type != video->queue.queue.type)
194 return -EINVAL;
195
196 /* Enable UVC video. */
197 ret = uvcg_video_enable(video, 1);
198 if (ret < 0)
199 return ret;
200
201 /*
202 * Complete the alternate setting selection setup phase now that
203 * userspace is ready to provide video frames.
204 */
205 uvc_function_setup_continue(uvc);
206 uvc->state = UVC_STATE_STREAMING;
207
208 return 0;
209}
210
211static int
212uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
213{
214 struct video_device *vdev = video_devdata(file);
215 struct uvc_device *uvc = video_get_drvdata(vdev);
216 struct uvc_video *video = &uvc->video;
217
218 if (type != video->queue.queue.type)
219 return -EINVAL;
220
221 return uvcg_video_enable(video, 0);
222}
223
224static int
225uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
226 const struct v4l2_event_subscription *sub)
227{
228 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
229 return -EINVAL;
230
231 return v4l2_event_subscribe(fh, sub, 2, NULL);
232}
233
234static int
235uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
236 const struct v4l2_event_subscription *sub)
237{
238 return v4l2_event_unsubscribe(fh, sub);
239}
240
241static long
242uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
243 unsigned int cmd, void *arg)
244{
245 struct video_device *vdev = video_devdata(file);
246 struct uvc_device *uvc = video_get_drvdata(vdev);
247
248 switch (cmd) {
249 case UVCIOC_SEND_RESPONSE:
250 return uvc_send_response(uvc, arg);
251
252 default:
253 return -ENOIOCTLCMD;
254 }
255}
256
257const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
258 .vidioc_querycap = uvc_v4l2_querycap,
259 .vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
260 .vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
261 .vidioc_reqbufs = uvc_v4l2_reqbufs,
262 .vidioc_querybuf = uvc_v4l2_querybuf,
263 .vidioc_qbuf = uvc_v4l2_qbuf,
264 .vidioc_dqbuf = uvc_v4l2_dqbuf,
265 .vidioc_streamon = uvc_v4l2_streamon,
266 .vidioc_streamoff = uvc_v4l2_streamoff,
267 .vidioc_subscribe_event = uvc_v4l2_subscribe_event,
268 .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
269 .vidioc_default = uvc_v4l2_ioctl_default,
270};
271
272/* --------------------------------------------------------------------------
273 * V4L2
274 */
275
276static int
277uvc_v4l2_open(struct file *file)
278{
279 struct video_device *vdev = video_devdata(file);
280 struct uvc_device *uvc = video_get_drvdata(vdev);
281 struct uvc_file_handle *handle;
282
283 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
284 if (handle == NULL)
285 return -ENOMEM;
286
287 v4l2_fh_init(&handle->vfh, vdev);
288 v4l2_fh_add(&handle->vfh);
289
290 handle->device = &uvc->video;
291 file->private_data = &handle->vfh;
292
293 uvc_function_connect(uvc);
294 return 0;
295}
296
297static int
298uvc_v4l2_release(struct file *file)
299{
300 struct video_device *vdev = video_devdata(file);
301 struct uvc_device *uvc = video_get_drvdata(vdev);
302 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
303 struct uvc_video *video = handle->device;
304
305 uvc_function_disconnect(uvc);
306
307 mutex_lock(&video->mutex);
308 uvcg_video_enable(video, 0);
309 uvcg_free_buffers(&video->queue);
310 mutex_unlock(&video->mutex);
311
312 file->private_data = NULL;
313 v4l2_fh_del(&handle->vfh);
314 v4l2_fh_exit(&handle->vfh);
315 kfree(handle);
316
317 return 0;
318}
319
320static int
321uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
322{
323 struct video_device *vdev = video_devdata(file);
324 struct uvc_device *uvc = video_get_drvdata(vdev);
325
326 return uvcg_queue_mmap(&uvc->video.queue, vma);
327}
328
329static __poll_t
330uvc_v4l2_poll(struct file *file, poll_table *wait)
331{
332 struct video_device *vdev = video_devdata(file);
333 struct uvc_device *uvc = video_get_drvdata(vdev);
334
335 return uvcg_queue_poll(&uvc->video.queue, file, wait);
336}
337
338#ifndef CONFIG_MMU
339static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
340 unsigned long addr, unsigned long len, unsigned long pgoff,
341 unsigned long flags)
342{
343 struct video_device *vdev = video_devdata(file);
344 struct uvc_device *uvc = video_get_drvdata(vdev);
345
346 return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
347}
348#endif
349
350const struct v4l2_file_operations uvc_v4l2_fops = {
351 .owner = THIS_MODULE,
352 .open = uvc_v4l2_open,
353 .release = uvc_v4l2_release,
354 .unlocked_ioctl = video_ioctl2,
355 .mmap = uvc_v4l2_mmap,
356 .poll = uvc_v4l2_poll,
357#ifndef CONFIG_MMU
358 .get_unmapped_area = uvcg_v4l2_get_unmapped_area,
359#endif
360};
361