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8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/init.h>
13#include <linux/device.h>
14#include <linux/suspend.h>
15#include <linux/videodev2.h>
16#include <linux/mutex.h>
17#include <media/v4l2-common.h>
18#include <media/v4l2-ioctl.h>
19#include <media/v4l2-event.h>
20#include <media/v4l2-device.h>
21#include <media/v4l2-ctrls.h>
22#include <media/v4l2-fh.h>
23
24#include "most/core.h"
25
26#define V4L2_CMP_MAX_INPUT 1
27
28static struct core_component comp;
29
30struct most_video_dev {
31 struct most_interface *iface;
32 int ch_idx;
33 struct list_head list;
34 bool mute;
35
36 struct list_head pending_mbos;
37 spinlock_t list_lock;
38
39 struct v4l2_device v4l2_dev;
40 atomic_t access_ref;
41 struct video_device *vdev;
42 unsigned int ctrl_input;
43
44 struct mutex lock;
45
46 wait_queue_head_t wait_data;
47};
48
49struct comp_fh {
50
51 struct v4l2_fh fh;
52 struct most_video_dev *mdev;
53 u32 offs;
54};
55
56static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
57static struct spinlock list_lock;
58
59static inline bool data_ready(struct most_video_dev *mdev)
60{
61 return !list_empty(&mdev->pending_mbos);
62}
63
64static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
65{
66 return list_first_entry(&mdev->pending_mbos, struct mbo, list);
67}
68
69static int comp_vdev_open(struct file *filp)
70{
71 int ret;
72 struct video_device *vdev = video_devdata(filp);
73 struct most_video_dev *mdev = video_drvdata(filp);
74 struct comp_fh *fh;
75
76 switch (vdev->vfl_type) {
77 case VFL_TYPE_GRABBER:
78 break;
79 default:
80 return -EINVAL;
81 }
82
83 fh = kzalloc(sizeof(*fh), GFP_KERNEL);
84 if (!fh)
85 return -ENOMEM;
86
87 if (!atomic_inc_and_test(&mdev->access_ref)) {
88 v4l2_err(&mdev->v4l2_dev, "too many clients\n");
89 ret = -EBUSY;
90 goto err_dec;
91 }
92
93 fh->mdev = mdev;
94 v4l2_fh_init(&fh->fh, vdev);
95 filp->private_data = fh;
96
97 v4l2_fh_add(&fh->fh);
98
99 ret = most_start_channel(mdev->iface, mdev->ch_idx, &comp);
100 if (ret) {
101 v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n");
102 goto err_rm;
103 }
104
105 return 0;
106
107err_rm:
108 v4l2_fh_del(&fh->fh);
109 v4l2_fh_exit(&fh->fh);
110
111err_dec:
112 atomic_dec(&mdev->access_ref);
113 kfree(fh);
114 return ret;
115}
116
117static int comp_vdev_close(struct file *filp)
118{
119 struct comp_fh *fh = filp->private_data;
120 struct most_video_dev *mdev = fh->mdev;
121 struct mbo *mbo, *tmp;
122
123
124
125
126
127
128
129
130
131
132 spin_lock_irq(&mdev->list_lock);
133 mdev->mute = true;
134 list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
135 list_del(&mbo->list);
136 spin_unlock_irq(&mdev->list_lock);
137 most_put_mbo(mbo);
138 spin_lock_irq(&mdev->list_lock);
139 }
140 spin_unlock_irq(&mdev->list_lock);
141 most_stop_channel(mdev->iface, mdev->ch_idx, &comp);
142 mdev->mute = false;
143
144 v4l2_fh_del(&fh->fh);
145 v4l2_fh_exit(&fh->fh);
146
147 atomic_dec(&mdev->access_ref);
148 kfree(fh);
149 return 0;
150}
151
152static ssize_t comp_vdev_read(struct file *filp, char __user *buf,
153 size_t count, loff_t *pos)
154{
155 struct comp_fh *fh = filp->private_data;
156 struct most_video_dev *mdev = fh->mdev;
157 int ret = 0;
158
159 if (*pos)
160 return -ESPIPE;
161
162 if (!mdev)
163 return -ENODEV;
164
165
166 if (!(filp->f_flags & O_NONBLOCK)) {
167 if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
168 return -ERESTARTSYS;
169 }
170
171 if (!data_ready(mdev))
172 return -EAGAIN;
173
174 while (count > 0 && data_ready(mdev)) {
175 struct mbo *const mbo = get_top_mbo(mdev);
176 int const rem = mbo->processed_length - fh->offs;
177 int const cnt = rem < count ? rem : count;
178
179 if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
180 v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n");
181 if (!ret)
182 ret = -EFAULT;
183 return ret;
184 }
185
186 fh->offs += cnt;
187 count -= cnt;
188 buf += cnt;
189 ret += cnt;
190
191 if (cnt >= rem) {
192 fh->offs = 0;
193 spin_lock_irq(&mdev->list_lock);
194 list_del(&mbo->list);
195 spin_unlock_irq(&mdev->list_lock);
196 most_put_mbo(mbo);
197 }
198 }
199 return ret;
200}
201
202static __poll_t comp_vdev_poll(struct file *filp, poll_table *wait)
203{
204 struct comp_fh *fh = filp->private_data;
205 struct most_video_dev *mdev = fh->mdev;
206 __poll_t mask = 0;
207
208
209 if (!data_ready(mdev))
210 poll_wait(filp, &mdev->wait_data, wait);
211 if (data_ready(mdev))
212 mask |= EPOLLIN | EPOLLRDNORM;
213
214 return mask;
215}
216
217static void comp_set_format_struct(struct v4l2_format *f)
218{
219 f->fmt.pix.width = 8;
220 f->fmt.pix.height = 8;
221 f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
222 f->fmt.pix.bytesperline = 0;
223 f->fmt.pix.sizeimage = 188 * 2;
224 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
225 f->fmt.pix.field = V4L2_FIELD_NONE;
226 f->fmt.pix.priv = 0;
227}
228
229static int comp_set_format(struct most_video_dev *mdev, unsigned int cmd,
230 struct v4l2_format *format)
231{
232 if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
233 return -EINVAL;
234
235 if (cmd == VIDIOC_TRY_FMT)
236 return 0;
237
238 comp_set_format_struct(format);
239
240 return 0;
241}
242
243static int vidioc_querycap(struct file *file, void *priv,
244 struct v4l2_capability *cap)
245{
246 struct comp_fh *fh = priv;
247 struct most_video_dev *mdev = fh->mdev;
248
249 strlcpy(cap->driver, "v4l2_component", sizeof(cap->driver));
250 strlcpy(cap->card, "MOST", sizeof(cap->card));
251 snprintf(cap->bus_info, sizeof(cap->bus_info),
252 "%s", mdev->iface->description);
253 return 0;
254}
255
256static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
257 struct v4l2_fmtdesc *f)
258{
259 if (f->index)
260 return -EINVAL;
261
262 strcpy(f->description, "MPEG");
263 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
264 f->flags = V4L2_FMT_FLAG_COMPRESSED;
265 f->pixelformat = V4L2_PIX_FMT_MPEG;
266
267 return 0;
268}
269
270static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
271 struct v4l2_format *f)
272{
273 comp_set_format_struct(f);
274 return 0;
275}
276
277static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
278 struct v4l2_format *f)
279{
280 struct comp_fh *fh = priv;
281 struct most_video_dev *mdev = fh->mdev;
282
283 return comp_set_format(mdev, VIDIOC_TRY_FMT, f);
284}
285
286static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
287 struct v4l2_format *f)
288{
289 struct comp_fh *fh = priv;
290 struct most_video_dev *mdev = fh->mdev;
291
292 return comp_set_format(mdev, VIDIOC_S_FMT, f);
293}
294
295static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
296{
297 *norm = V4L2_STD_UNKNOWN;
298 return 0;
299}
300
301static int vidioc_enum_input(struct file *file, void *priv,
302 struct v4l2_input *input)
303{
304 struct comp_fh *fh = priv;
305 struct most_video_dev *mdev = fh->mdev;
306
307 if (input->index >= V4L2_CMP_MAX_INPUT)
308 return -EINVAL;
309
310 strcpy(input->name, "MOST Video");
311 input->type |= V4L2_INPUT_TYPE_CAMERA;
312 input->audioset = 0;
313
314 input->std = mdev->vdev->tvnorms;
315
316 return 0;
317}
318
319static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
320{
321 struct comp_fh *fh = priv;
322 struct most_video_dev *mdev = fh->mdev;
323 *i = mdev->ctrl_input;
324 return 0;
325}
326
327static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
328{
329 struct comp_fh *fh = priv;
330 struct most_video_dev *mdev = fh->mdev;
331
332 if (index >= V4L2_CMP_MAX_INPUT)
333 return -EINVAL;
334 mdev->ctrl_input = index;
335 return 0;
336}
337
338static const struct v4l2_file_operations comp_fops = {
339 .owner = THIS_MODULE,
340 .open = comp_vdev_open,
341 .release = comp_vdev_close,
342 .read = comp_vdev_read,
343 .poll = comp_vdev_poll,
344 .unlocked_ioctl = video_ioctl2,
345};
346
347static const struct v4l2_ioctl_ops video_ioctl_ops = {
348 .vidioc_querycap = vidioc_querycap,
349 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
350 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
351 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
352 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
353 .vidioc_g_std = vidioc_g_std,
354 .vidioc_enum_input = vidioc_enum_input,
355 .vidioc_g_input = vidioc_g_input,
356 .vidioc_s_input = vidioc_s_input,
357};
358
359static const struct video_device comp_videodev_template = {
360 .fops = &comp_fops,
361 .release = video_device_release,
362 .ioctl_ops = &video_ioctl_ops,
363 .tvnorms = V4L2_STD_UNKNOWN,
364 .device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE,
365};
366
367
368
369static struct most_video_dev *get_comp_dev(
370 struct most_interface *iface, int channel_idx)
371{
372 struct most_video_dev *mdev;
373 unsigned long flags;
374
375 spin_lock_irqsave(&list_lock, flags);
376 list_for_each_entry(mdev, &video_devices, list) {
377 if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
378 spin_unlock_irqrestore(&list_lock, flags);
379 return mdev;
380 }
381 }
382 spin_unlock_irqrestore(&list_lock, flags);
383 return NULL;
384}
385
386static int comp_rx_data(struct mbo *mbo)
387{
388 unsigned long flags;
389 struct most_video_dev *mdev =
390 get_comp_dev(mbo->ifp, mbo->hdm_channel_id);
391
392 if (!mdev)
393 return -EIO;
394
395 spin_lock_irqsave(&mdev->list_lock, flags);
396 if (unlikely(mdev->mute)) {
397 spin_unlock_irqrestore(&mdev->list_lock, flags);
398 return -EIO;
399 }
400
401 list_add_tail(&mbo->list, &mdev->pending_mbos);
402 spin_unlock_irqrestore(&mdev->list_lock, flags);
403 wake_up_interruptible(&mdev->wait_data);
404 return 0;
405}
406
407static int comp_register_videodev(struct most_video_dev *mdev)
408{
409 int ret;
410
411 init_waitqueue_head(&mdev->wait_data);
412
413
414 mdev->vdev = video_device_alloc();
415 if (!mdev->vdev)
416 return -ENOMEM;
417
418
419 *mdev->vdev = comp_videodev_template;
420 mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
421 mdev->vdev->lock = &mdev->lock;
422 snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
423 mdev->v4l2_dev.name);
424
425
426 video_set_drvdata(mdev->vdev, mdev);
427 ret = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
428 if (ret) {
429 v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
430 ret);
431 video_device_release(mdev->vdev);
432 }
433
434 return ret;
435}
436
437static void comp_unregister_videodev(struct most_video_dev *mdev)
438{
439 video_unregister_device(mdev->vdev);
440}
441
442static void comp_v4l2_dev_release(struct v4l2_device *v4l2_dev)
443{
444 struct most_video_dev *mdev =
445 container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
446
447 v4l2_device_unregister(v4l2_dev);
448 kfree(mdev);
449}
450
451static int comp_probe_channel(struct most_interface *iface, int channel_idx,
452 struct most_channel_config *ccfg, char *name,
453 char *args)
454{
455 int ret;
456 struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
457
458 if (mdev) {
459 pr_err("channel already linked\n");
460 return -EEXIST;
461 }
462
463 if (ccfg->direction != MOST_CH_RX) {
464 pr_err("wrong direction, expect rx\n");
465 return -EINVAL;
466 }
467
468 if (ccfg->data_type != MOST_CH_SYNC &&
469 ccfg->data_type != MOST_CH_ISOC) {
470 pr_err("wrong channel type, expect sync or isoc\n");
471 return -EINVAL;
472 }
473
474 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
475 if (!mdev)
476 return -ENOMEM;
477
478 mutex_init(&mdev->lock);
479 atomic_set(&mdev->access_ref, -1);
480 spin_lock_init(&mdev->list_lock);
481 INIT_LIST_HEAD(&mdev->pending_mbos);
482 mdev->iface = iface;
483 mdev->ch_idx = channel_idx;
484 mdev->v4l2_dev.release = comp_v4l2_dev_release;
485
486
487 strlcpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name));
488 ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
489 if (ret) {
490 pr_err("v4l2_device_register() failed\n");
491 kfree(mdev);
492 return ret;
493 }
494
495 ret = comp_register_videodev(mdev);
496 if (ret)
497 goto err_unreg;
498
499 spin_lock_irq(&list_lock);
500 list_add(&mdev->list, &video_devices);
501 spin_unlock_irq(&list_lock);
502 return 0;
503
504err_unreg:
505 v4l2_device_disconnect(&mdev->v4l2_dev);
506 v4l2_device_put(&mdev->v4l2_dev);
507 return ret;
508}
509
510static int comp_disconnect_channel(struct most_interface *iface,
511 int channel_idx)
512{
513 struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
514
515 if (!mdev) {
516 pr_err("no such channel is linked\n");
517 return -ENOENT;
518 }
519
520 spin_lock_irq(&list_lock);
521 list_del(&mdev->list);
522 spin_unlock_irq(&list_lock);
523
524 comp_unregister_videodev(mdev);
525 v4l2_device_disconnect(&mdev->v4l2_dev);
526 v4l2_device_put(&mdev->v4l2_dev);
527 return 0;
528}
529
530static struct core_component comp = {
531 .name = "video",
532 .probe_channel = comp_probe_channel,
533 .disconnect_channel = comp_disconnect_channel,
534 .rx_completion = comp_rx_data,
535};
536
537static int __init comp_init(void)
538{
539 int err;
540
541 spin_lock_init(&list_lock);
542 err = most_register_component(&comp);
543 if (err)
544 return err;
545 err = most_register_configfs_subsys(&comp);
546 if (err) {
547 most_deregister_component(&comp);
548 return err;
549 }
550 return 0;
551}
552
553static void __exit comp_exit(void)
554{
555 struct most_video_dev *mdev, *tmp;
556
557
558
559
560
561
562
563 spin_lock_irq(&list_lock);
564 list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
565 list_del(&mdev->list);
566 spin_unlock_irq(&list_lock);
567
568 comp_unregister_videodev(mdev);
569 v4l2_device_disconnect(&mdev->v4l2_dev);
570 v4l2_device_put(&mdev->v4l2_dev);
571 spin_lock_irq(&list_lock);
572 }
573 spin_unlock_irq(&list_lock);
574
575 most_deregister_configfs_subsys(&comp);
576 most_deregister_component(&comp);
577 BUG_ON(!list_empty(&video_devices));
578}
579
580module_init(comp_init);
581module_exit(comp_exit);
582
583MODULE_DESCRIPTION("V4L2 Component Module for Mostcore");
584MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
585MODULE_LICENSE("GPL");
586
