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Linux/samples/v4l/v4l2-pci-skeleton.c

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  1 /*
  2  * This is a V4L2 PCI Skeleton Driver. It gives an initial skeleton source
  3  * for use with other PCI drivers.
  4  *
  5  * This skeleton PCI driver assumes that the card has an S-Video connector as
  6  * input 0 and an HDMI connector as input 1.
  7  *
  8  * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
  9  *
 10  * This program is free software; you may redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; version 2 of the License.
 13  *
 14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 15  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 16  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 17  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 18  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 19  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 21  * SOFTWARE.
 22  */
 23 
 24 #include <linux/types.h>
 25 #include <linux/kernel.h>
 26 #include <linux/module.h>
 27 #include <linux/init.h>
 28 #include <linux/kmod.h>
 29 #include <linux/mutex.h>
 30 #include <linux/pci.h>
 31 #include <linux/interrupt.h>
 32 #include <linux/videodev2.h>
 33 #include <linux/v4l2-dv-timings.h>
 34 #include <media/v4l2-device.h>
 35 #include <media/v4l2-dev.h>
 36 #include <media/v4l2-ioctl.h>
 37 #include <media/v4l2-dv-timings.h>
 38 #include <media/v4l2-ctrls.h>
 39 #include <media/v4l2-event.h>
 40 #include <media/videobuf2-v4l2.h>
 41 #include <media/videobuf2-dma-contig.h>
 42 
 43 MODULE_DESCRIPTION("V4L2 PCI Skeleton Driver");
 44 MODULE_AUTHOR("Hans Verkuil");
 45 MODULE_LICENSE("GPL v2");
 46 
 47 /**
 48  * struct skeleton - All internal data for one instance of device
 49  * @pdev: PCI device
 50  * @v4l2_dev: top-level v4l2 device struct
 51  * @vdev: video node structure
 52  * @ctrl_handler: control handler structure
 53  * @lock: ioctl serialization mutex
 54  * @std: current SDTV standard
 55  * @timings: current HDTV timings
 56  * @format: current pix format
 57  * @input: current video input (0 = SDTV, 1 = HDTV)
 58  * @queue: vb2 video capture queue
 59  * @qlock: spinlock controlling access to buf_list and sequence
 60  * @buf_list: list of buffers queued for DMA
 61  * @sequence: frame sequence counter
 62  */
 63 struct skeleton {
 64         struct pci_dev *pdev;
 65         struct v4l2_device v4l2_dev;
 66         struct video_device vdev;
 67         struct v4l2_ctrl_handler ctrl_handler;
 68         struct mutex lock;
 69         v4l2_std_id std;
 70         struct v4l2_dv_timings timings;
 71         struct v4l2_pix_format format;
 72         unsigned input;
 73 
 74         struct vb2_queue queue;
 75 
 76         spinlock_t qlock;
 77         struct list_head buf_list;
 78         unsigned field;
 79         unsigned sequence;
 80 };
 81 
 82 struct skel_buffer {
 83         struct vb2_buffer vb;
 84         struct list_head list;
 85 };
 86 
 87 static inline struct skel_buffer *to_skel_buffer(struct vb2_buffer *vb2)
 88 {
 89         return container_of(vb2, struct skel_buffer, vb);
 90 }
 91 
 92 static const struct pci_device_id skeleton_pci_tbl[] = {
 93         /* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */
 94         { 0, }
 95 };
 96 MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl);
 97 
 98 /*
 99  * HDTV: this structure has the capabilities of the HDTV receiver.
100  * It is used to constrain the huge list of possible formats based
101  * upon the hardware capabilities.
102  */
103 static const struct v4l2_dv_timings_cap skel_timings_cap = {
104         .type = V4L2_DV_BT_656_1120,
105         /* keep this initialization for compatibility with GCC < 4.4.6 */
106         .reserved = { 0 },
107         V4L2_INIT_BT_TIMINGS(
108                 720, 1920,              /* min/max width */
109                 480, 1080,              /* min/max height */
110                 27000000, 74250000,     /* min/max pixelclock*/
111                 V4L2_DV_BT_STD_CEA861,  /* Supported standards */
112                 /* capabilities */
113                 V4L2_DV_BT_CAP_INTERLACED | V4L2_DV_BT_CAP_PROGRESSIVE
114         )
115 };
116 
117 /*
118  * Supported SDTV standards. This does the same job as skel_timings_cap, but
119  * for standard TV formats.
120  */
121 #define SKEL_TVNORMS V4L2_STD_ALL
122 
123 /*
124  * Interrupt handler: typically interrupts happen after a new frame has been
125  * captured. It is the job of the handler to remove the new frame from the
126  * internal list and give it back to the vb2 framework, updating the sequence
127  * counter, field and timestamp at the same time.
128  */
129 static irqreturn_t skeleton_irq(int irq, void *dev_id)
130 {
131 #ifdef TODO
132         struct skeleton *skel = dev_id;
133 
134         /* handle interrupt */
135 
136         /* Once a new frame has been captured, mark it as done like this: */
137         if (captured_new_frame) {
138                 ...
139                 spin_lock(&skel->qlock);
140                 list_del(&new_buf->list);
141                 spin_unlock(&skel->qlock);
142                 v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
143                 new_buf->vb.v4l2_buf.sequence = skel->sequence++;
144                 new_buf->vb.v4l2_buf.field = skel->field;
145                 if (skel->format.field == V4L2_FIELD_ALTERNATE) {
146                         if (skel->field == V4L2_FIELD_BOTTOM)
147                                 skel->field = V4L2_FIELD_TOP;
148                         else if (skel->field == V4L2_FIELD_TOP)
149                                 skel->field = V4L2_FIELD_BOTTOM;
150                 }
151                 vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
152         }
153 #endif
154         return IRQ_HANDLED;
155 }
156 
157 /*
158  * Setup the constraints of the queue: besides setting the number of planes
159  * per buffer and the size and allocation context of each plane, it also
160  * checks if sufficient buffers have been allocated. Usually 3 is a good
161  * minimum number: many DMA engines need a minimum of 2 buffers in the
162  * queue and you need to have another available for userspace processing.
163  */
164 static int queue_setup(struct vb2_queue *vq,
165                        unsigned int *nbuffers, unsigned int *nplanes,
166                        unsigned int sizes[], struct device *alloc_devs[])
167 {
168         struct skeleton *skel = vb2_get_drv_priv(vq);
169 
170         skel->field = skel->format.field;
171         if (skel->field == V4L2_FIELD_ALTERNATE) {
172                 /*
173                  * You cannot use read() with FIELD_ALTERNATE since the field
174                  * information (TOP/BOTTOM) cannot be passed back to the user.
175                  */
176                 if (vb2_fileio_is_active(vq))
177                         return -EINVAL;
178                 skel->field = V4L2_FIELD_TOP;
179         }
180 
181         if (vq->num_buffers + *nbuffers < 3)
182                 *nbuffers = 3 - vq->num_buffers;
183 
184         if (*nplanes)
185                 return sizes[0] < skel->format.sizeimage ? -EINVAL : 0;
186         *nplanes = 1;
187         sizes[0] = skel->format.sizeimage;
188         return 0;
189 }
190 
191 /*
192  * Prepare the buffer for queueing to the DMA engine: check and set the
193  * payload size.
194  */
195 static int buffer_prepare(struct vb2_buffer *vb)
196 {
197         struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
198         unsigned long size = skel->format.sizeimage;
199 
200         if (vb2_plane_size(vb, 0) < size) {
201                 dev_err(&skel->pdev->dev, "buffer too small (%lu < %lu)\n",
202                          vb2_plane_size(vb, 0), size);
203                 return -EINVAL;
204         }
205 
206         vb2_set_plane_payload(vb, 0, size);
207         return 0;
208 }
209 
210 /*
211  * Queue this buffer to the DMA engine.
212  */
213 static void buffer_queue(struct vb2_buffer *vb)
214 {
215         struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
216         struct skel_buffer *buf = to_skel_buffer(vb);
217         unsigned long flags;
218 
219         spin_lock_irqsave(&skel->qlock, flags);
220         list_add_tail(&buf->list, &skel->buf_list);
221 
222         /* TODO: Update any DMA pointers if necessary */
223 
224         spin_unlock_irqrestore(&skel->qlock, flags);
225 }
226 
227 static void return_all_buffers(struct skeleton *skel,
228                                enum vb2_buffer_state state)
229 {
230         struct skel_buffer *buf, *node;
231         unsigned long flags;
232 
233         spin_lock_irqsave(&skel->qlock, flags);
234         list_for_each_entry_safe(buf, node, &skel->buf_list, list) {
235                 vb2_buffer_done(&buf->vb, state);
236                 list_del(&buf->list);
237         }
238         spin_unlock_irqrestore(&skel->qlock, flags);
239 }
240 
241 /*
242  * Start streaming. First check if the minimum number of buffers have been
243  * queued. If not, then return -ENOBUFS and the vb2 framework will call
244  * this function again the next time a buffer has been queued until enough
245  * buffers are available to actually start the DMA engine.
246  */
247 static int start_streaming(struct vb2_queue *vq, unsigned int count)
248 {
249         struct skeleton *skel = vb2_get_drv_priv(vq);
250         int ret = 0;
251 
252         skel->sequence = 0;
253 
254         /* TODO: start DMA */
255 
256         if (ret) {
257                 /*
258                  * In case of an error, return all active buffers to the
259                  * QUEUED state
260                  */
261                 return_all_buffers(skel, VB2_BUF_STATE_QUEUED);
262         }
263         return ret;
264 }
265 
266 /*
267  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
268  * and passed on to the vb2 framework marked as STATE_ERROR.
269  */
270 static void stop_streaming(struct vb2_queue *vq)
271 {
272         struct skeleton *skel = vb2_get_drv_priv(vq);
273 
274         /* TODO: stop DMA */
275 
276         /* Release all active buffers */
277         return_all_buffers(skel, VB2_BUF_STATE_ERROR);
278 }
279 
280 /*
281  * The vb2 queue ops. Note that since q->lock is set we can use the standard
282  * vb2_ops_wait_prepare/finish helper functions. If q->lock would be NULL,
283  * then this driver would have to provide these ops.
284  */
285 static const struct vb2_ops skel_qops = {
286         .queue_setup            = queue_setup,
287         .buf_prepare            = buffer_prepare,
288         .buf_queue              = buffer_queue,
289         .start_streaming        = start_streaming,
290         .stop_streaming         = stop_streaming,
291         .wait_prepare           = vb2_ops_wait_prepare,
292         .wait_finish            = vb2_ops_wait_finish,
293 };
294 
295 /*
296  * Required ioctl querycap. Note that the version field is prefilled with
297  * the version of the kernel.
298  */
299 static int skeleton_querycap(struct file *file, void *priv,
300                              struct v4l2_capability *cap)
301 {
302         struct skeleton *skel = video_drvdata(file);
303 
304         strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
305         strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card));
306         snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s",
307                  pci_name(skel->pdev));
308         return 0;
309 }
310 
311 /*
312  * Helper function to check and correct struct v4l2_pix_format. It's used
313  * not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV
314  * standard, HDTV timings or the video input would require updating the
315  * current format.
316  */
317 static void skeleton_fill_pix_format(struct skeleton *skel,
318                                      struct v4l2_pix_format *pix)
319 {
320         pix->pixelformat = V4L2_PIX_FMT_YUYV;
321         if (skel->input == 0) {
322                 /* S-Video input */
323                 pix->width = 720;
324                 pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576;
325                 pix->field = V4L2_FIELD_INTERLACED;
326                 pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
327         } else {
328                 /* HDMI input */
329                 pix->width = skel->timings.bt.width;
330                 pix->height = skel->timings.bt.height;
331                 if (skel->timings.bt.interlaced) {
332                         pix->field = V4L2_FIELD_ALTERNATE;
333                         pix->height /= 2;
334                 } else {
335                         pix->field = V4L2_FIELD_NONE;
336                 }
337                 pix->colorspace = V4L2_COLORSPACE_REC709;
338         }
339 
340         /*
341          * The YUYV format is four bytes for every two pixels, so bytesperline
342          * is width * 2.
343          */
344         pix->bytesperline = pix->width * 2;
345         pix->sizeimage = pix->bytesperline * pix->height;
346         pix->priv = 0;
347 }
348 
349 static int skeleton_try_fmt_vid_cap(struct file *file, void *priv,
350                                     struct v4l2_format *f)
351 {
352         struct skeleton *skel = video_drvdata(file);
353         struct v4l2_pix_format *pix = &f->fmt.pix;
354 
355         /*
356          * Due to historical reasons providing try_fmt with an unsupported
357          * pixelformat will return -EINVAL for video receivers. Webcam drivers,
358          * however, will silently correct the pixelformat. Some video capture
359          * applications rely on this behavior...
360          */
361         if (pix->pixelformat != V4L2_PIX_FMT_YUYV)
362                 return -EINVAL;
363         skeleton_fill_pix_format(skel, pix);
364         return 0;
365 }
366 
367 static int skeleton_s_fmt_vid_cap(struct file *file, void *priv,
368                                   struct v4l2_format *f)
369 {
370         struct skeleton *skel = video_drvdata(file);
371         int ret;
372 
373         ret = skeleton_try_fmt_vid_cap(file, priv, f);
374         if (ret)
375                 return ret;
376 
377         /*
378          * It is not allowed to change the format while buffers for use with
379          * streaming have already been allocated.
380          */
381         if (vb2_is_busy(&skel->queue))
382                 return -EBUSY;
383 
384         /* TODO: change format */
385         skel->format = f->fmt.pix;
386         return 0;
387 }
388 
389 static int skeleton_g_fmt_vid_cap(struct file *file, void *priv,
390                                   struct v4l2_format *f)
391 {
392         struct skeleton *skel = video_drvdata(file);
393 
394         f->fmt.pix = skel->format;
395         return 0;
396 }
397 
398 static int skeleton_enum_fmt_vid_cap(struct file *file, void *priv,
399                                      struct v4l2_fmtdesc *f)
400 {
401         if (f->index != 0)
402                 return -EINVAL;
403 
404         f->pixelformat = V4L2_PIX_FMT_YUYV;
405         return 0;
406 }
407 
408 static int skeleton_s_std(struct file *file, void *priv, v4l2_std_id std)
409 {
410         struct skeleton *skel = video_drvdata(file);
411 
412         /* S_STD is not supported on the HDMI input */
413         if (skel->input)
414                 return -ENODATA;
415 
416         /*
417          * No change, so just return. Some applications call S_STD again after
418          * the buffers for streaming have been set up, so we have to allow for
419          * this behavior.
420          */
421         if (std == skel->std)
422                 return 0;
423 
424         /*
425          * Changing the standard implies a format change, which is not allowed
426          * while buffers for use with streaming have already been allocated.
427          */
428         if (vb2_is_busy(&skel->queue))
429                 return -EBUSY;
430 
431         /* TODO: handle changing std */
432 
433         skel->std = std;
434 
435         /* Update the internal format */
436         skeleton_fill_pix_format(skel, &skel->format);
437         return 0;
438 }
439 
440 static int skeleton_g_std(struct file *file, void *priv, v4l2_std_id *std)
441 {
442         struct skeleton *skel = video_drvdata(file);
443 
444         /* G_STD is not supported on the HDMI input */
445         if (skel->input)
446                 return -ENODATA;
447 
448         *std = skel->std;
449         return 0;
450 }
451 
452 /*
453  * Query the current standard as seen by the hardware. This function shall
454  * never actually change the standard, it just detects and reports.
455  * The framework will initially set *std to tvnorms (i.e. the set of
456  * supported standards by this input), and this function should just AND
457  * this value. If there is no signal, then *std should be set to 0.
458  */
459 static int skeleton_querystd(struct file *file, void *priv, v4l2_std_id *std)
460 {
461         struct skeleton *skel = video_drvdata(file);
462 
463         /* QUERY_STD is not supported on the HDMI input */
464         if (skel->input)
465                 return -ENODATA;
466 
467 #ifdef TODO
468         /*
469          * Query currently seen standard. Initial value of *std is
470          * V4L2_STD_ALL. This function should look something like this:
471          */
472         get_signal_info();
473         if (no_signal) {
474                 *std = 0;
475                 return 0;
476         }
477         /* Use signal information to reduce the number of possible standards */
478         if (signal_has_525_lines)
479                 *std &= V4L2_STD_525_60;
480         else
481                 *std &= V4L2_STD_625_50;
482 #endif
483         return 0;
484 }
485 
486 static int skeleton_s_dv_timings(struct file *file, void *_fh,
487                                  struct v4l2_dv_timings *timings)
488 {
489         struct skeleton *skel = video_drvdata(file);
490 
491         /* S_DV_TIMINGS is not supported on the S-Video input */
492         if (skel->input == 0)
493                 return -ENODATA;
494 
495         /* Quick sanity check */
496         if (!v4l2_valid_dv_timings(timings, &skel_timings_cap, NULL, NULL))
497                 return -EINVAL;
498 
499         /* Check if the timings are part of the CEA-861 timings. */
500         if (!v4l2_find_dv_timings_cap(timings, &skel_timings_cap,
501                                       0, NULL, NULL))
502                 return -EINVAL;
503 
504         /* Return 0 if the new timings are the same as the current timings. */
505         if (v4l2_match_dv_timings(timings, &skel->timings, 0, false))
506                 return 0;
507 
508         /*
509          * Changing the timings implies a format change, which is not allowed
510          * while buffers for use with streaming have already been allocated.
511          */
512         if (vb2_is_busy(&skel->queue))
513                 return -EBUSY;
514 
515         /* TODO: Configure new timings */
516 
517         /* Save timings */
518         skel->timings = *timings;
519 
520         /* Update the internal format */
521         skeleton_fill_pix_format(skel, &skel->format);
522         return 0;
523 }
524 
525 static int skeleton_g_dv_timings(struct file *file, void *_fh,
526                                  struct v4l2_dv_timings *timings)
527 {
528         struct skeleton *skel = video_drvdata(file);
529 
530         /* G_DV_TIMINGS is not supported on the S-Video input */
531         if (skel->input == 0)
532                 return -ENODATA;
533 
534         *timings = skel->timings;
535         return 0;
536 }
537 
538 static int skeleton_enum_dv_timings(struct file *file, void *_fh,
539                                     struct v4l2_enum_dv_timings *timings)
540 {
541         struct skeleton *skel = video_drvdata(file);
542 
543         /* ENUM_DV_TIMINGS is not supported on the S-Video input */
544         if (skel->input == 0)
545                 return -ENODATA;
546 
547         return v4l2_enum_dv_timings_cap(timings, &skel_timings_cap,
548                                         NULL, NULL);
549 }
550 
551 /*
552  * Query the current timings as seen by the hardware. This function shall
553  * never actually change the timings, it just detects and reports.
554  * If no signal is detected, then return -ENOLINK. If the hardware cannot
555  * lock to the signal, then return -ENOLCK. If the signal is out of range
556  * of the capabilities of the system (e.g., it is possible that the receiver
557  * can lock but that the DMA engine it is connected to cannot handle
558  * pixelclocks above a certain frequency), then -ERANGE is returned.
559  */
560 static int skeleton_query_dv_timings(struct file *file, void *_fh,
561                                      struct v4l2_dv_timings *timings)
562 {
563         struct skeleton *skel = video_drvdata(file);
564 
565         /* QUERY_DV_TIMINGS is not supported on the S-Video input */
566         if (skel->input == 0)
567                 return -ENODATA;
568 
569 #ifdef TODO
570         /*
571          * Query currently seen timings. This function should look
572          * something like this:
573          */
574         detect_timings();
575         if (no_signal)
576                 return -ENOLINK;
577         if (cannot_lock_to_signal)
578                 return -ENOLCK;
579         if (signal_out_of_range_of_capabilities)
580                 return -ERANGE;
581 
582         /* Useful for debugging */
583         v4l2_print_dv_timings(skel->v4l2_dev.name, "query_dv_timings:",
584                         timings, true);
585 #endif
586         return 0;
587 }
588 
589 static int skeleton_dv_timings_cap(struct file *file, void *fh,
590                                    struct v4l2_dv_timings_cap *cap)
591 {
592         struct skeleton *skel = video_drvdata(file);
593 
594         /* DV_TIMINGS_CAP is not supported on the S-Video input */
595         if (skel->input == 0)
596                 return -ENODATA;
597         *cap = skel_timings_cap;
598         return 0;
599 }
600 
601 static int skeleton_enum_input(struct file *file, void *priv,
602                                struct v4l2_input *i)
603 {
604         if (i->index > 1)
605                 return -EINVAL;
606 
607         i->type = V4L2_INPUT_TYPE_CAMERA;
608         if (i->index == 0) {
609                 i->std = SKEL_TVNORMS;
610                 strlcpy(i->name, "S-Video", sizeof(i->name));
611                 i->capabilities = V4L2_IN_CAP_STD;
612         } else {
613                 i->std = 0;
614                 strlcpy(i->name, "HDMI", sizeof(i->name));
615                 i->capabilities = V4L2_IN_CAP_DV_TIMINGS;
616         }
617         return 0;
618 }
619 
620 static int skeleton_s_input(struct file *file, void *priv, unsigned int i)
621 {
622         struct skeleton *skel = video_drvdata(file);
623 
624         if (i > 1)
625                 return -EINVAL;
626 
627         /*
628          * Changing the input implies a format change, which is not allowed
629          * while buffers for use with streaming have already been allocated.
630          */
631         if (vb2_is_busy(&skel->queue))
632                 return -EBUSY;
633 
634         skel->input = i;
635         /*
636          * Update tvnorms. The tvnorms value is used by the core to implement
637          * VIDIOC_ENUMSTD so it has to be correct. If tvnorms == 0, then
638          * ENUMSTD will return -ENODATA.
639          */
640         skel->vdev.tvnorms = i ? 0 : SKEL_TVNORMS;
641 
642         /* Update the internal format */
643         skeleton_fill_pix_format(skel, &skel->format);
644         return 0;
645 }
646 
647 static int skeleton_g_input(struct file *file, void *priv, unsigned int *i)
648 {
649         struct skeleton *skel = video_drvdata(file);
650 
651         *i = skel->input;
652         return 0;
653 }
654 
655 /* The control handler. */
656 static int skeleton_s_ctrl(struct v4l2_ctrl *ctrl)
657 {
658         /*struct skeleton *skel =
659                 container_of(ctrl->handler, struct skeleton, ctrl_handler);*/
660 
661         switch (ctrl->id) {
662         case V4L2_CID_BRIGHTNESS:
663                 /* TODO: set brightness to ctrl->val */
664                 break;
665         case V4L2_CID_CONTRAST:
666                 /* TODO: set contrast to ctrl->val */
667                 break;
668         case V4L2_CID_SATURATION:
669                 /* TODO: set saturation to ctrl->val */
670                 break;
671         case V4L2_CID_HUE:
672                 /* TODO: set hue to ctrl->val */
673                 break;
674         default:
675                 return -EINVAL;
676         }
677         return 0;
678 }
679 
680 /* ------------------------------------------------------------------
681         File operations for the device
682    ------------------------------------------------------------------*/
683 
684 static const struct v4l2_ctrl_ops skel_ctrl_ops = {
685         .s_ctrl = skeleton_s_ctrl,
686 };
687 
688 /*
689  * The set of all supported ioctls. Note that all the streaming ioctls
690  * use the vb2 helper functions that take care of all the locking and
691  * that also do ownership tracking (i.e. only the filehandle that requested
692  * the buffers can call the streaming ioctls, all other filehandles will
693  * receive -EBUSY if they attempt to call the same streaming ioctls).
694  *
695  * The last three ioctls also use standard helper functions: these implement
696  * standard behavior for drivers with controls.
697  */
698 static const struct v4l2_ioctl_ops skel_ioctl_ops = {
699         .vidioc_querycap = skeleton_querycap,
700         .vidioc_try_fmt_vid_cap = skeleton_try_fmt_vid_cap,
701         .vidioc_s_fmt_vid_cap = skeleton_s_fmt_vid_cap,
702         .vidioc_g_fmt_vid_cap = skeleton_g_fmt_vid_cap,
703         .vidioc_enum_fmt_vid_cap = skeleton_enum_fmt_vid_cap,
704 
705         .vidioc_g_std = skeleton_g_std,
706         .vidioc_s_std = skeleton_s_std,
707         .vidioc_querystd = skeleton_querystd,
708 
709         .vidioc_s_dv_timings = skeleton_s_dv_timings,
710         .vidioc_g_dv_timings = skeleton_g_dv_timings,
711         .vidioc_enum_dv_timings = skeleton_enum_dv_timings,
712         .vidioc_query_dv_timings = skeleton_query_dv_timings,
713         .vidioc_dv_timings_cap = skeleton_dv_timings_cap,
714 
715         .vidioc_enum_input = skeleton_enum_input,
716         .vidioc_g_input = skeleton_g_input,
717         .vidioc_s_input = skeleton_s_input,
718 
719         .vidioc_reqbufs = vb2_ioctl_reqbufs,
720         .vidioc_create_bufs = vb2_ioctl_create_bufs,
721         .vidioc_querybuf = vb2_ioctl_querybuf,
722         .vidioc_qbuf = vb2_ioctl_qbuf,
723         .vidioc_dqbuf = vb2_ioctl_dqbuf,
724         .vidioc_expbuf = vb2_ioctl_expbuf,
725         .vidioc_streamon = vb2_ioctl_streamon,
726         .vidioc_streamoff = vb2_ioctl_streamoff,
727 
728         .vidioc_log_status = v4l2_ctrl_log_status,
729         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
730         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
731 };
732 
733 /*
734  * The set of file operations. Note that all these ops are standard core
735  * helper functions.
736  */
737 static const struct v4l2_file_operations skel_fops = {
738         .owner = THIS_MODULE,
739         .open = v4l2_fh_open,
740         .release = vb2_fop_release,
741         .unlocked_ioctl = video_ioctl2,
742         .read = vb2_fop_read,
743         .mmap = vb2_fop_mmap,
744         .poll = vb2_fop_poll,
745 };
746 
747 /*
748  * The initial setup of this device instance. Note that the initial state of
749  * the driver should be complete. So the initial format, standard, timings
750  * and video input should all be initialized to some reasonable value.
751  */
752 static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
753 {
754         /* The initial timings are chosen to be 720p60. */
755         static const struct v4l2_dv_timings timings_def =
756                 V4L2_DV_BT_CEA_1280X720P60;
757         struct skeleton *skel;
758         struct video_device *vdev;
759         struct v4l2_ctrl_handler *hdl;
760         struct vb2_queue *q;
761         int ret;
762 
763         /* Enable PCI */
764         ret = pci_enable_device(pdev);
765         if (ret)
766                 return ret;
767         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
768         if (ret) {
769                 dev_err(&pdev->dev, "no suitable DMA available.\n");
770                 goto disable_pci;
771         }
772 
773         /* Allocate a new instance */
774         skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL);
775         if (!skel) {
776                 ret = -ENOMEM;
777                 goto disable_pci;
778         }
779 
780         /* Allocate the interrupt */
781         ret = devm_request_irq(&pdev->dev, pdev->irq,
782                                skeleton_irq, 0, KBUILD_MODNAME, skel);
783         if (ret) {
784                 dev_err(&pdev->dev, "request_irq failed\n");
785                 goto disable_pci;
786         }
787         skel->pdev = pdev;
788 
789         /* Fill in the initial format-related settings */
790         skel->timings = timings_def;
791         skel->std = V4L2_STD_625_50;
792         skeleton_fill_pix_format(skel, &skel->format);
793 
794         /* Initialize the top-level structure */
795         ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev);
796         if (ret)
797                 goto disable_pci;
798 
799         mutex_init(&skel->lock);
800 
801         /* Add the controls */
802         hdl = &skel->ctrl_handler;
803         v4l2_ctrl_handler_init(hdl, 4);
804         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
805                           V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
806         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
807                           V4L2_CID_CONTRAST, 0, 255, 1, 16);
808         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
809                           V4L2_CID_SATURATION, 0, 255, 1, 127);
810         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
811                           V4L2_CID_HUE, -128, 127, 1, 0);
812         if (hdl->error) {
813                 ret = hdl->error;
814                 goto free_hdl;
815         }
816         skel->v4l2_dev.ctrl_handler = hdl;
817 
818         /* Initialize the vb2 queue */
819         q = &skel->queue;
820         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
821         q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
822         q->dev = &pdev->dev;
823         q->drv_priv = skel;
824         q->buf_struct_size = sizeof(struct skel_buffer);
825         q->ops = &skel_qops;
826         q->mem_ops = &vb2_dma_contig_memops;
827         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
828         /*
829          * Assume that this DMA engine needs to have at least two buffers
830          * available before it can be started. The start_streaming() op
831          * won't be called until at least this many buffers are queued up.
832          */
833         q->min_buffers_needed = 2;
834         /*
835          * The serialization lock for the streaming ioctls. This is the same
836          * as the main serialization lock, but if some of the non-streaming
837          * ioctls could take a long time to execute, then you might want to
838          * have a different lock here to prevent VIDIOC_DQBUF from being
839          * blocked while waiting for another action to finish. This is
840          * generally not needed for PCI devices, but USB devices usually do
841          * want a separate lock here.
842          */
843         q->lock = &skel->lock;
844         /*
845          * Since this driver can only do 32-bit DMA we must make sure that
846          * the vb2 core will allocate the buffers in 32-bit DMA memory.
847          */
848         q->gfp_flags = GFP_DMA32;
849         ret = vb2_queue_init(q);
850         if (ret)
851                 goto free_hdl;
852 
853         INIT_LIST_HEAD(&skel->buf_list);
854         spin_lock_init(&skel->qlock);
855 
856         /* Initialize the video_device structure */
857         vdev = &skel->vdev;
858         strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
859         /*
860          * There is nothing to clean up, so release is set to an empty release
861          * function. The release callback must be non-NULL.
862          */
863         vdev->release = video_device_release_empty;
864         vdev->fops = &skel_fops,
865         vdev->ioctl_ops = &skel_ioctl_ops,
866         vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
867                             V4L2_CAP_STREAMING;
868         /*
869          * The main serialization lock. All ioctls are serialized by this
870          * lock. Exception: if q->lock is set, then the streaming ioctls
871          * are serialized by that separate lock.
872          */
873         vdev->lock = &skel->lock;
874         vdev->queue = q;
875         vdev->v4l2_dev = &skel->v4l2_dev;
876         /* Supported SDTV standards, if any */
877         vdev->tvnorms = SKEL_TVNORMS;
878         video_set_drvdata(vdev, skel);
879 
880         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
881         if (ret)
882                 goto free_hdl;
883 
884         dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n");
885         return 0;
886 
887 free_hdl:
888         v4l2_ctrl_handler_free(&skel->ctrl_handler);
889         v4l2_device_unregister(&skel->v4l2_dev);
890 disable_pci:
891         pci_disable_device(pdev);
892         return ret;
893 }
894 
895 static void skeleton_remove(struct pci_dev *pdev)
896 {
897         struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
898         struct skeleton *skel = container_of(v4l2_dev, struct skeleton, v4l2_dev);
899 
900         video_unregister_device(&skel->vdev);
901         v4l2_ctrl_handler_free(&skel->ctrl_handler);
902         v4l2_device_unregister(&skel->v4l2_dev);
903         pci_disable_device(skel->pdev);
904 }
905 
906 static struct pci_driver skeleton_driver = {
907         .name = KBUILD_MODNAME,
908         .probe = skeleton_probe,
909         .remove = skeleton_remove,
910         .id_table = skeleton_pci_tbl,
911 };
912 
913 module_pci_driver(skeleton_driver);
914 

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