Loading...
Note: File does not exist in v3.1.
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 schedule_work(&video->pump);
173
174 return ret;
175}
176
177static int
178uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
179{
180 struct video_device *vdev = video_devdata(file);
181 struct uvc_device *uvc = video_get_drvdata(vdev);
182 struct uvc_video *video = &uvc->video;
183
184 return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
185}
186
187static int
188uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
189{
190 struct video_device *vdev = video_devdata(file);
191 struct uvc_device *uvc = video_get_drvdata(vdev);
192 struct uvc_video *video = &uvc->video;
193 int ret;
194
195 if (type != video->queue.queue.type)
196 return -EINVAL;
197
198 /* Enable UVC video. */
199 ret = uvcg_video_enable(video, 1);
200 if (ret < 0)
201 return ret;
202
203 /*
204 * Complete the alternate setting selection setup phase now that
205 * userspace is ready to provide video frames.
206 */
207 uvc_function_setup_continue(uvc);
208 uvc->state = UVC_STATE_STREAMING;
209
210 return 0;
211}
212
213static int
214uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
215{
216 struct video_device *vdev = video_devdata(file);
217 struct uvc_device *uvc = video_get_drvdata(vdev);
218 struct uvc_video *video = &uvc->video;
219
220 if (type != video->queue.queue.type)
221 return -EINVAL;
222
223 return uvcg_video_enable(video, 0);
224}
225
226static int
227uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
228 const struct v4l2_event_subscription *sub)
229{
230 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
231 return -EINVAL;
232
233 return v4l2_event_subscribe(fh, sub, 2, NULL);
234}
235
236static int
237uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
238 const struct v4l2_event_subscription *sub)
239{
240 return v4l2_event_unsubscribe(fh, sub);
241}
242
243static long
244uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
245 unsigned int cmd, void *arg)
246{
247 struct video_device *vdev = video_devdata(file);
248 struct uvc_device *uvc = video_get_drvdata(vdev);
249
250 switch (cmd) {
251 case UVCIOC_SEND_RESPONSE:
252 return uvc_send_response(uvc, arg);
253
254 default:
255 return -ENOIOCTLCMD;
256 }
257}
258
259const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
260 .vidioc_querycap = uvc_v4l2_querycap,
261 .vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
262 .vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
263 .vidioc_reqbufs = uvc_v4l2_reqbufs,
264 .vidioc_querybuf = uvc_v4l2_querybuf,
265 .vidioc_qbuf = uvc_v4l2_qbuf,
266 .vidioc_dqbuf = uvc_v4l2_dqbuf,
267 .vidioc_streamon = uvc_v4l2_streamon,
268 .vidioc_streamoff = uvc_v4l2_streamoff,
269 .vidioc_subscribe_event = uvc_v4l2_subscribe_event,
270 .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
271 .vidioc_default = uvc_v4l2_ioctl_default,
272};
273
274/* --------------------------------------------------------------------------
275 * V4L2
276 */
277
278static int
279uvc_v4l2_open(struct file *file)
280{
281 struct video_device *vdev = video_devdata(file);
282 struct uvc_device *uvc = video_get_drvdata(vdev);
283 struct uvc_file_handle *handle;
284
285 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
286 if (handle == NULL)
287 return -ENOMEM;
288
289 v4l2_fh_init(&handle->vfh, vdev);
290 v4l2_fh_add(&handle->vfh);
291
292 handle->device = &uvc->video;
293 file->private_data = &handle->vfh;
294
295 uvc_function_connect(uvc);
296 return 0;
297}
298
299static int
300uvc_v4l2_release(struct file *file)
301{
302 struct video_device *vdev = video_devdata(file);
303 struct uvc_device *uvc = video_get_drvdata(vdev);
304 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
305 struct uvc_video *video = handle->device;
306
307 uvc_function_disconnect(uvc);
308
309 mutex_lock(&video->mutex);
310 uvcg_video_enable(video, 0);
311 uvcg_free_buffers(&video->queue);
312 mutex_unlock(&video->mutex);
313
314 file->private_data = NULL;
315 v4l2_fh_del(&handle->vfh);
316 v4l2_fh_exit(&handle->vfh);
317 kfree(handle);
318
319 return 0;
320}
321
322static int
323uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
324{
325 struct video_device *vdev = video_devdata(file);
326 struct uvc_device *uvc = video_get_drvdata(vdev);
327
328 return uvcg_queue_mmap(&uvc->video.queue, vma);
329}
330
331static __poll_t
332uvc_v4l2_poll(struct file *file, poll_table *wait)
333{
334 struct video_device *vdev = video_devdata(file);
335 struct uvc_device *uvc = video_get_drvdata(vdev);
336
337 return uvcg_queue_poll(&uvc->video.queue, file, wait);
338}
339
340#ifndef CONFIG_MMU
341static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
342 unsigned long addr, unsigned long len, unsigned long pgoff,
343 unsigned long flags)
344{
345 struct video_device *vdev = video_devdata(file);
346 struct uvc_device *uvc = video_get_drvdata(vdev);
347
348 return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
349}
350#endif
351
352const struct v4l2_file_operations uvc_v4l2_fops = {
353 .owner = THIS_MODULE,
354 .open = uvc_v4l2_open,
355 .release = uvc_v4l2_release,
356 .unlocked_ioctl = video_ioctl2,
357 .mmap = uvc_v4l2_mmap,
358 .poll = uvc_v4l2_poll,
359#ifndef CONFIG_MMU
360 .get_unmapped_area = uvcg_v4l2_get_unmapped_area,
361#endif
362};
363