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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  * @field: the field (TOP/BOTTOM/other) of the current buffer
 62  * @sequence: frame sequence counter
 63  */
 64 struct skeleton {
 65         struct pci_dev *pdev;
 66         struct v4l2_device v4l2_dev;
 67         struct video_device vdev;
 68         struct v4l2_ctrl_handler ctrl_handler;
 69         struct mutex lock;
 70         v4l2_std_id std;
 71         struct v4l2_dv_timings timings;
 72         struct v4l2_pix_format format;
 73         unsigned input;
 74 
 75         struct vb2_queue queue;
 76 
 77         spinlock_t qlock;
 78         struct list_head buf_list;
 79         unsigned field;
 80         unsigned sequence;
 81 };
 82 
 83 struct skel_buffer {
 84         struct vb2_v4l2_buffer vb;
 85         struct list_head list;
 86 };
 87 
 88 static inline struct skel_buffer *to_skel_buffer(struct vb2_v4l2_buffer *vbuf)
 89 {
 90         return container_of(vbuf, struct skel_buffer, vb);
 91 }
 92 
 93 static const struct pci_device_id skeleton_pci_tbl[] = {
 94         /* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */
 95         { 0, }
 96 };
 97 MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl);
 98 
 99 /*
100  * HDTV: this structure has the capabilities of the HDTV receiver.
101  * It is used to constrain the huge list of possible formats based
102  * upon the hardware capabilities.
103  */
104 static const struct v4l2_dv_timings_cap skel_timings_cap = {
105         .type = V4L2_DV_BT_656_1120,
106         /* keep this initialization for compatibility with GCC < 4.4.6 */
107         .reserved = { 0 },
108         V4L2_INIT_BT_TIMINGS(
109                 720, 1920,              /* min/max width */
110                 480, 1080,              /* min/max height */
111                 27000000, 74250000,     /* min/max pixelclock*/
112                 V4L2_DV_BT_STD_CEA861,  /* Supported standards */
113                 /* capabilities */
114                 V4L2_DV_BT_CAP_INTERLACED | V4L2_DV_BT_CAP_PROGRESSIVE
115         )
116 };
117 
118 /*
119  * Supported SDTV standards. This does the same job as skel_timings_cap, but
120  * for standard TV formats.
121  */
122 #define SKEL_TVNORMS V4L2_STD_ALL
123 
124 /*
125  * Interrupt handler: typically interrupts happen after a new frame has been
126  * captured. It is the job of the handler to remove the new frame from the
127  * internal list and give it back to the vb2 framework, updating the sequence
128  * counter, field and timestamp at the same time.
129  */
130 static irqreturn_t skeleton_irq(int irq, void *dev_id)
131 {
132 #ifdef TODO
133         struct skeleton *skel = dev_id;
134 
135         /* handle interrupt */
136 
137         /* Once a new frame has been captured, mark it as done like this: */
138         if (captured_new_frame) {
139                 ...
140                 spin_lock(&skel->qlock);
141                 list_del(&new_buf->list);
142                 spin_unlock(&skel->qlock);
143                 new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
144                 new_buf->vb.sequence = skel->sequence++;
145                 new_buf->vb.field = skel->field;
146                 if (skel->format.field == V4L2_FIELD_ALTERNATE) {
147                         if (skel->field == V4L2_FIELD_BOTTOM)
148                                 skel->field = V4L2_FIELD_TOP;
149                         else if (skel->field == V4L2_FIELD_TOP)
150                                 skel->field = V4L2_FIELD_BOTTOM;
151                 }
152                 vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
153         }
154 #endif
155         return IRQ_HANDLED;
156 }
157 
158 /*
159  * Setup the constraints of the queue: besides setting the number of planes
160  * per buffer and the size and allocation context of each plane, it also
161  * checks if sufficient buffers have been allocated. Usually 3 is a good
162  * minimum number: many DMA engines need a minimum of 2 buffers in the
163  * queue and you need to have another available for userspace processing.
164  */
165 static int queue_setup(struct vb2_queue *vq,
166                        unsigned int *nbuffers, unsigned int *nplanes,
167                        unsigned int sizes[], struct device *alloc_devs[])
168 {
169         struct skeleton *skel = vb2_get_drv_priv(vq);
170 
171         skel->field = skel->format.field;
172         if (skel->field == V4L2_FIELD_ALTERNATE) {
173                 /*
174                  * You cannot use read() with FIELD_ALTERNATE since the field
175                  * information (TOP/BOTTOM) cannot be passed back to the user.
176                  */
177                 if (vb2_fileio_is_active(vq))
178                         return -EINVAL;
179                 skel->field = V4L2_FIELD_TOP;
180         }
181 
182         if (vq->num_buffers + *nbuffers < 3)
183                 *nbuffers = 3 - vq->num_buffers;
184 
185         if (*nplanes)
186                 return sizes[0] < skel->format.sizeimage ? -EINVAL : 0;
187         *nplanes = 1;
188         sizes[0] = skel->format.sizeimage;
189         return 0;
190 }
191 
192 /*
193  * Prepare the buffer for queueing to the DMA engine: check and set the
194  * payload size.
195  */
196 static int buffer_prepare(struct vb2_buffer *vb)
197 {
198         struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
199         unsigned long size = skel->format.sizeimage;
200 
201         if (vb2_plane_size(vb, 0) < size) {
202                 dev_err(&skel->pdev->dev, "buffer too small (%lu < %lu)\n",
203                          vb2_plane_size(vb, 0), size);
204                 return -EINVAL;
205         }
206 
207         vb2_set_plane_payload(vb, 0, size);
208         return 0;
209 }
210 
211 /*
212  * Queue this buffer to the DMA engine.
213  */
214 static void buffer_queue(struct vb2_buffer *vb)
215 {
216         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
217         struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
218         struct skel_buffer *buf = to_skel_buffer(vbuf);
219         unsigned long flags;
220 
221         spin_lock_irqsave(&skel->qlock, flags);
222         list_add_tail(&buf->list, &skel->buf_list);
223 
224         /* TODO: Update any DMA pointers if necessary */
225 
226         spin_unlock_irqrestore(&skel->qlock, flags);
227 }
228 
229 static void return_all_buffers(struct skeleton *skel,
230                                enum vb2_buffer_state state)
231 {
232         struct skel_buffer *buf, *node;
233         unsigned long flags;
234 
235         spin_lock_irqsave(&skel->qlock, flags);
236         list_for_each_entry_safe(buf, node, &skel->buf_list, list) {
237                 vb2_buffer_done(&buf->vb.vb2_buf, state);
238                 list_del(&buf->list);
239         }
240         spin_unlock_irqrestore(&skel->qlock, flags);
241 }
242 
243 /*
244  * Start streaming. First check if the minimum number of buffers have been
245  * queued. If not, then return -ENOBUFS and the vb2 framework will call
246  * this function again the next time a buffer has been queued until enough
247  * buffers are available to actually start the DMA engine.
248  */
249 static int start_streaming(struct vb2_queue *vq, unsigned int count)
250 {
251         struct skeleton *skel = vb2_get_drv_priv(vq);
252         int ret = 0;
253 
254         skel->sequence = 0;
255 
256         /* TODO: start DMA */
257 
258         if (ret) {
259                 /*
260                  * In case of an error, return all active buffers to the
261                  * QUEUED state
262                  */
263                 return_all_buffers(skel, VB2_BUF_STATE_QUEUED);
264         }
265         return ret;
266 }
267 
268 /*
269  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
270  * and passed on to the vb2 framework marked as STATE_ERROR.
271  */
272 static void stop_streaming(struct vb2_queue *vq)
273 {
274         struct skeleton *skel = vb2_get_drv_priv(vq);
275 
276         /* TODO: stop DMA */
277 
278         /* Release all active buffers */
279         return_all_buffers(skel, VB2_BUF_STATE_ERROR);
280 }
281 
282 /*
283  * The vb2 queue ops. Note that since q->lock is set we can use the standard
284  * vb2_ops_wait_prepare/finish helper functions. If q->lock would be NULL,
285  * then this driver would have to provide these ops.
286  */
287 static const struct vb2_ops skel_qops = {
288         .queue_setup            = queue_setup,
289         .buf_prepare            = buffer_prepare,
290         .buf_queue              = buffer_queue,
291         .start_streaming        = start_streaming,
292         .stop_streaming         = stop_streaming,
293         .wait_prepare           = vb2_ops_wait_prepare,
294         .wait_finish            = vb2_ops_wait_finish,
295 };
296 
297 /*
298  * Required ioctl querycap. Note that the version field is prefilled with
299  * the version of the kernel.
300  */
301 static int skeleton_querycap(struct file *file, void *priv,
302                              struct v4l2_capability *cap)
303 {
304         struct skeleton *skel = video_drvdata(file);
305 
306         strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
307         strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card));
308         snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s",
309                  pci_name(skel->pdev));
310         return 0;
311 }
312 
313 /*
314  * Helper function to check and correct struct v4l2_pix_format. It's used
315  * not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV
316  * standard, HDTV timings or the video input would require updating the
317  * current format.
318  */
319 static void skeleton_fill_pix_format(struct skeleton *skel,
320                                      struct v4l2_pix_format *pix)
321 {
322         pix->pixelformat = V4L2_PIX_FMT_YUYV;
323         if (skel->input == 0) {
324                 /* S-Video input */
325                 pix->width = 720;
326                 pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576;
327                 pix->field = V4L2_FIELD_INTERLACED;
328                 pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
329         } else {
330                 /* HDMI input */
331                 pix->width = skel->timings.bt.width;
332                 pix->height = skel->timings.bt.height;
333                 if (skel->timings.bt.interlaced) {
334                         pix->field = V4L2_FIELD_ALTERNATE;
335                         pix->height /= 2;
336                 } else {
337                         pix->field = V4L2_FIELD_NONE;
338                 }
339                 pix->colorspace = V4L2_COLORSPACE_REC709;
340         }
341 
342         /*
343          * The YUYV format is four bytes for every two pixels, so bytesperline
344          * is width * 2.
345          */
346         pix->bytesperline = pix->width * 2;
347         pix->sizeimage = pix->bytesperline * pix->height;
348         pix->priv = 0;
349 }
350 
351 static int skeleton_try_fmt_vid_cap(struct file *file, void *priv,
352                                     struct v4l2_format *f)
353 {
354         struct skeleton *skel = video_drvdata(file);
355         struct v4l2_pix_format *pix = &f->fmt.pix;
356 
357         /*
358          * Due to historical reasons providing try_fmt with an unsupported
359          * pixelformat will return -EINVAL for video receivers. Webcam drivers,
360          * however, will silently correct the pixelformat. Some video capture
361          * applications rely on this behavior...
362          */
363         if (pix->pixelformat != V4L2_PIX_FMT_YUYV)
364                 return -EINVAL;
365         skeleton_fill_pix_format(skel, pix);
366         return 0;
367 }
368 
369 static int skeleton_s_fmt_vid_cap(struct file *file, void *priv,
370                                   struct v4l2_format *f)
371 {
372         struct skeleton *skel = video_drvdata(file);
373         int ret;
374 
375         ret = skeleton_try_fmt_vid_cap(file, priv, f);
376         if (ret)
377                 return ret;
378 
379         /*
380          * It is not allowed to change the format while buffers for use with
381          * streaming have already been allocated.
382          */
383         if (vb2_is_busy(&skel->queue))
384                 return -EBUSY;
385 
386         /* TODO: change format */
387         skel->format = f->fmt.pix;
388         return 0;
389 }
390 
391 static int skeleton_g_fmt_vid_cap(struct file *file, void *priv,
392                                   struct v4l2_format *f)
393 {
394         struct skeleton *skel = video_drvdata(file);
395 
396         f->fmt.pix = skel->format;
397         return 0;
398 }
399 
400 static int skeleton_enum_fmt_vid_cap(struct file *file, void *priv,
401                                      struct v4l2_fmtdesc *f)
402 {
403         if (f->index != 0)
404                 return -EINVAL;
405 
406         f->pixelformat = V4L2_PIX_FMT_YUYV;
407         return 0;
408 }
409 
410 static int skeleton_s_std(struct file *file, void *priv, v4l2_std_id std)
411 {
412         struct skeleton *skel = video_drvdata(file);
413 
414         /* S_STD is not supported on the HDMI input */
415         if (skel->input)
416                 return -ENODATA;
417 
418         /*
419          * No change, so just return. Some applications call S_STD again after
420          * the buffers for streaming have been set up, so we have to allow for
421          * this behavior.
422          */
423         if (std == skel->std)
424                 return 0;
425 
426         /*
427          * Changing the standard implies a format change, which is not allowed
428          * while buffers for use with streaming have already been allocated.
429          */
430         if (vb2_is_busy(&skel->queue))
431                 return -EBUSY;
432 
433         /* TODO: handle changing std */
434 
435         skel->std = std;
436 
437         /* Update the internal format */
438         skeleton_fill_pix_format(skel, &skel->format);
439         return 0;
440 }
441 
442 static int skeleton_g_std(struct file *file, void *priv, v4l2_std_id *std)
443 {
444         struct skeleton *skel = video_drvdata(file);
445 
446         /* G_STD is not supported on the HDMI input */
447         if (skel->input)
448                 return -ENODATA;
449 
450         *std = skel->std;
451         return 0;
452 }
453 
454 /*
455  * Query the current standard as seen by the hardware. This function shall
456  * never actually change the standard, it just detects and reports.
457  * The framework will initially set *std to tvnorms (i.e. the set of
458  * supported standards by this input), and this function should just AND
459  * this value. If there is no signal, then *std should be set to 0.
460  */
461 static int skeleton_querystd(struct file *file, void *priv, v4l2_std_id *std)
462 {
463         struct skeleton *skel = video_drvdata(file);
464 
465         /* QUERY_STD is not supported on the HDMI input */
466         if (skel->input)
467                 return -ENODATA;
468 
469 #ifdef TODO
470         /*
471          * Query currently seen standard. Initial value of *std is
472          * V4L2_STD_ALL. This function should look something like this:
473          */
474         get_signal_info();
475         if (no_signal) {
476                 *std = 0;
477                 return 0;
478         }
479         /* Use signal information to reduce the number of possible standards */
480         if (signal_has_525_lines)
481                 *std &= V4L2_STD_525_60;
482         else
483                 *std &= V4L2_STD_625_50;
484 #endif
485         return 0;
486 }
487 
488 static int skeleton_s_dv_timings(struct file *file, void *_fh,
489                                  struct v4l2_dv_timings *timings)
490 {
491         struct skeleton *skel = video_drvdata(file);
492 
493         /* S_DV_TIMINGS is not supported on the S-Video input */
494         if (skel->input == 0)
495                 return -ENODATA;
496 
497         /* Quick sanity check */
498         if (!v4l2_valid_dv_timings(timings, &skel_timings_cap, NULL, NULL))
499                 return -EINVAL;
500 
501         /* Check if the timings are part of the CEA-861 timings. */
502         if (!v4l2_find_dv_timings_cap(timings, &skel_timings_cap,
503                                       0, NULL, NULL))
504                 return -EINVAL;
505 
506         /* Return 0 if the new timings are the same as the current timings. */
507         if (v4l2_match_dv_timings(timings, &skel->timings, 0, false))
508                 return 0;
509 
510         /*
511          * Changing the timings implies a format change, which is not allowed
512          * while buffers for use with streaming have already been allocated.
513          */
514         if (vb2_is_busy(&skel->queue))
515                 return -EBUSY;
516 
517         /* TODO: Configure new timings */
518 
519         /* Save timings */
520         skel->timings = *timings;
521 
522         /* Update the internal format */
523         skeleton_fill_pix_format(skel, &skel->format);
524         return 0;
525 }
526 
527 static int skeleton_g_dv_timings(struct file *file, void *_fh,
528                                  struct v4l2_dv_timings *timings)
529 {
530         struct skeleton *skel = video_drvdata(file);
531 
532         /* G_DV_TIMINGS is not supported on the S-Video input */
533         if (skel->input == 0)
534                 return -ENODATA;
535 
536         *timings = skel->timings;
537         return 0;
538 }
539 
540 static int skeleton_enum_dv_timings(struct file *file, void *_fh,
541                                     struct v4l2_enum_dv_timings *timings)
542 {
543         struct skeleton *skel = video_drvdata(file);
544 
545         /* ENUM_DV_TIMINGS is not supported on the S-Video input */
546         if (skel->input == 0)
547                 return -ENODATA;
548 
549         return v4l2_enum_dv_timings_cap(timings, &skel_timings_cap,
550                                         NULL, NULL);
551 }
552 
553 /*
554  * Query the current timings as seen by the hardware. This function shall
555  * never actually change the timings, it just detects and reports.
556  * If no signal is detected, then return -ENOLINK. If the hardware cannot
557  * lock to the signal, then return -ENOLCK. If the signal is out of range
558  * of the capabilities of the system (e.g., it is possible that the receiver
559  * can lock but that the DMA engine it is connected to cannot handle
560  * pixelclocks above a certain frequency), then -ERANGE is returned.
561  */
562 static int skeleton_query_dv_timings(struct file *file, void *_fh,
563                                      struct v4l2_dv_timings *timings)
564 {
565         struct skeleton *skel = video_drvdata(file);
566 
567         /* QUERY_DV_TIMINGS is not supported on the S-Video input */
568         if (skel->input == 0)
569                 return -ENODATA;
570 
571 #ifdef TODO
572         /*
573          * Query currently seen timings. This function should look
574          * something like this:
575          */
576         detect_timings();
577         if (no_signal)
578                 return -ENOLINK;
579         if (cannot_lock_to_signal)
580                 return -ENOLCK;
581         if (signal_out_of_range_of_capabilities)
582                 return -ERANGE;
583 
584         /* Useful for debugging */
585         v4l2_print_dv_timings(skel->v4l2_dev.name, "query_dv_timings:",
586                         timings, true);
587 #endif
588         return 0;
589 }
590 
591 static int skeleton_dv_timings_cap(struct file *file, void *fh,
592                                    struct v4l2_dv_timings_cap *cap)
593 {
594         struct skeleton *skel = video_drvdata(file);
595 
596         /* DV_TIMINGS_CAP is not supported on the S-Video input */
597         if (skel->input == 0)
598                 return -ENODATA;
599         *cap = skel_timings_cap;
600         return 0;
601 }
602 
603 static int skeleton_enum_input(struct file *file, void *priv,
604                                struct v4l2_input *i)
605 {
606         if (i->index > 1)
607                 return -EINVAL;
608 
609         i->type = V4L2_INPUT_TYPE_CAMERA;
610         if (i->index == 0) {
611                 i->std = SKEL_TVNORMS;
612                 strlcpy(i->name, "S-Video", sizeof(i->name));
613                 i->capabilities = V4L2_IN_CAP_STD;
614         } else {
615                 i->std = 0;
616                 strlcpy(i->name, "HDMI", sizeof(i->name));
617                 i->capabilities = V4L2_IN_CAP_DV_TIMINGS;
618         }
619         return 0;
620 }
621 
622 static int skeleton_s_input(struct file *file, void *priv, unsigned int i)
623 {
624         struct skeleton *skel = video_drvdata(file);
625 
626         if (i > 1)
627                 return -EINVAL;
628 
629         /*
630          * Changing the input implies a format change, which is not allowed
631          * while buffers for use with streaming have already been allocated.
632          */
633         if (vb2_is_busy(&skel->queue))
634                 return -EBUSY;
635 
636         skel->input = i;
637         /*
638          * Update tvnorms. The tvnorms value is used by the core to implement
639          * VIDIOC_ENUMSTD so it has to be correct. If tvnorms == 0, then
640          * ENUMSTD will return -ENODATA.
641          */
642         skel->vdev.tvnorms = i ? 0 : SKEL_TVNORMS;
643 
644         /* Update the internal format */
645         skeleton_fill_pix_format(skel, &skel->format);
646         return 0;
647 }
648 
649 static int skeleton_g_input(struct file *file, void *priv, unsigned int *i)
650 {
651         struct skeleton *skel = video_drvdata(file);
652 
653         *i = skel->input;
654         return 0;
655 }
656 
657 /* The control handler. */
658 static int skeleton_s_ctrl(struct v4l2_ctrl *ctrl)
659 {
660         /*struct skeleton *skel =
661                 container_of(ctrl->handler, struct skeleton, ctrl_handler);*/
662 
663         switch (ctrl->id) {
664         case V4L2_CID_BRIGHTNESS:
665                 /* TODO: set brightness to ctrl->val */
666                 break;
667         case V4L2_CID_CONTRAST:
668                 /* TODO: set contrast to ctrl->val */
669                 break;
670         case V4L2_CID_SATURATION:
671                 /* TODO: set saturation to ctrl->val */
672                 break;
673         case V4L2_CID_HUE:
674                 /* TODO: set hue to ctrl->val */
675                 break;
676         default:
677                 return -EINVAL;
678         }
679         return 0;
680 }
681 
682 /* ------------------------------------------------------------------
683         File operations for the device
684    ------------------------------------------------------------------*/
685 
686 static const struct v4l2_ctrl_ops skel_ctrl_ops = {
687         .s_ctrl = skeleton_s_ctrl,
688 };
689 
690 /*
691  * The set of all supported ioctls. Note that all the streaming ioctls
692  * use the vb2 helper functions that take care of all the locking and
693  * that also do ownership tracking (i.e. only the filehandle that requested
694  * the buffers can call the streaming ioctls, all other filehandles will
695  * receive -EBUSY if they attempt to call the same streaming ioctls).
696  *
697  * The last three ioctls also use standard helper functions: these implement
698  * standard behavior for drivers with controls.
699  */
700 static const struct v4l2_ioctl_ops skel_ioctl_ops = {
701         .vidioc_querycap = skeleton_querycap,
702         .vidioc_try_fmt_vid_cap = skeleton_try_fmt_vid_cap,
703         .vidioc_s_fmt_vid_cap = skeleton_s_fmt_vid_cap,
704         .vidioc_g_fmt_vid_cap = skeleton_g_fmt_vid_cap,
705         .vidioc_enum_fmt_vid_cap = skeleton_enum_fmt_vid_cap,
706 
707         .vidioc_g_std = skeleton_g_std,
708         .vidioc_s_std = skeleton_s_std,
709         .vidioc_querystd = skeleton_querystd,
710 
711         .vidioc_s_dv_timings = skeleton_s_dv_timings,
712         .vidioc_g_dv_timings = skeleton_g_dv_timings,
713         .vidioc_enum_dv_timings = skeleton_enum_dv_timings,
714         .vidioc_query_dv_timings = skeleton_query_dv_timings,
715         .vidioc_dv_timings_cap = skeleton_dv_timings_cap,
716 
717         .vidioc_enum_input = skeleton_enum_input,
718         .vidioc_g_input = skeleton_g_input,
719         .vidioc_s_input = skeleton_s_input,
720 
721         .vidioc_reqbufs = vb2_ioctl_reqbufs,
722         .vidioc_create_bufs = vb2_ioctl_create_bufs,
723         .vidioc_querybuf = vb2_ioctl_querybuf,
724         .vidioc_qbuf = vb2_ioctl_qbuf,
725         .vidioc_dqbuf = vb2_ioctl_dqbuf,
726         .vidioc_expbuf = vb2_ioctl_expbuf,
727         .vidioc_streamon = vb2_ioctl_streamon,
728         .vidioc_streamoff = vb2_ioctl_streamoff,
729 
730         .vidioc_log_status = v4l2_ctrl_log_status,
731         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
732         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
733 };
734 
735 /*
736  * The set of file operations. Note that all these ops are standard core
737  * helper functions.
738  */
739 static const struct v4l2_file_operations skel_fops = {
740         .owner = THIS_MODULE,
741         .open = v4l2_fh_open,
742         .release = vb2_fop_release,
743         .unlocked_ioctl = video_ioctl2,
744         .read = vb2_fop_read,
745         .mmap = vb2_fop_mmap,
746         .poll = vb2_fop_poll,
747 };
748 
749 /*
750  * The initial setup of this device instance. Note that the initial state of
751  * the driver should be complete. So the initial format, standard, timings
752  * and video input should all be initialized to some reasonable value.
753  */
754 static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
755 {
756         /* The initial timings are chosen to be 720p60. */
757         static const struct v4l2_dv_timings timings_def =
758                 V4L2_DV_BT_CEA_1280X720P60;
759         struct skeleton *skel;
760         struct video_device *vdev;
761         struct v4l2_ctrl_handler *hdl;
762         struct vb2_queue *q;
763         int ret;
764 
765         /* Enable PCI */
766         ret = pci_enable_device(pdev);
767         if (ret)
768                 return ret;
769         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
770         if (ret) {
771                 dev_err(&pdev->dev, "no suitable DMA available.\n");
772                 goto disable_pci;
773         }
774 
775         /* Allocate a new instance */
776         skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL);
777         if (!skel) {
778                 ret = -ENOMEM;
779                 goto disable_pci;
780         }
781 
782         /* Allocate the interrupt */
783         ret = devm_request_irq(&pdev->dev, pdev->irq,
784                                skeleton_irq, 0, KBUILD_MODNAME, skel);
785         if (ret) {
786                 dev_err(&pdev->dev, "request_irq failed\n");
787                 goto disable_pci;
788         }
789         skel->pdev = pdev;
790 
791         /* Fill in the initial format-related settings */
792         skel->timings = timings_def;
793         skel->std = V4L2_STD_625_50;
794         skeleton_fill_pix_format(skel, &skel->format);
795 
796         /* Initialize the top-level structure */
797         ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev);
798         if (ret)
799                 goto disable_pci;
800 
801         mutex_init(&skel->lock);
802 
803         /* Add the controls */
804         hdl = &skel->ctrl_handler;
805         v4l2_ctrl_handler_init(hdl, 4);
806         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
807                           V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
808         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
809                           V4L2_CID_CONTRAST, 0, 255, 1, 16);
810         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
811                           V4L2_CID_SATURATION, 0, 255, 1, 127);
812         v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
813                           V4L2_CID_HUE, -128, 127, 1, 0);
814         if (hdl->error) {
815                 ret = hdl->error;
816                 goto free_hdl;
817         }
818         skel->v4l2_dev.ctrl_handler = hdl;
819 
820         /* Initialize the vb2 queue */
821         q = &skel->queue;
822         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
823         q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
824         q->dev = &pdev->dev;
825         q->drv_priv = skel;
826         q->buf_struct_size = sizeof(struct skel_buffer);
827         q->ops = &skel_qops;
828         q->mem_ops = &vb2_dma_contig_memops;
829         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
830         /*
831          * Assume that this DMA engine needs to have at least two buffers
832          * available before it can be started. The start_streaming() op
833          * won't be called until at least this many buffers are queued up.
834          */
835         q->min_buffers_needed = 2;
836         /*
837          * The serialization lock for the streaming ioctls. This is the same
838          * as the main serialization lock, but if some of the non-streaming
839          * ioctls could take a long time to execute, then you might want to
840          * have a different lock here to prevent VIDIOC_DQBUF from being
841          * blocked while waiting for another action to finish. This is
842          * generally not needed for PCI devices, but USB devices usually do
843          * want a separate lock here.
844          */
845         q->lock = &skel->lock;
846         /*
847          * Since this driver can only do 32-bit DMA we must make sure that
848          * the vb2 core will allocate the buffers in 32-bit DMA memory.
849          */
850         q->gfp_flags = GFP_DMA32;
851         ret = vb2_queue_init(q);
852         if (ret)
853                 goto free_hdl;
854 
855         INIT_LIST_HEAD(&skel->buf_list);
856         spin_lock_init(&skel->qlock);
857 
858         /* Initialize the video_device structure */
859         vdev = &skel->vdev;
860         strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
861         /*
862          * There is nothing to clean up, so release is set to an empty release
863          * function. The release callback must be non-NULL.
864          */
865         vdev->release = video_device_release_empty;
866         vdev->fops = &skel_fops,
867         vdev->ioctl_ops = &skel_ioctl_ops,
868         vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
869                             V4L2_CAP_STREAMING;
870         /*
871          * The main serialization lock. All ioctls are serialized by this
872          * lock. Exception: if q->lock is set, then the streaming ioctls
873          * are serialized by that separate lock.
874          */
875         vdev->lock = &skel->lock;
876         vdev->queue = q;
877         vdev->v4l2_dev = &skel->v4l2_dev;
878         /* Supported SDTV standards, if any */
879         vdev->tvnorms = SKEL_TVNORMS;
880         video_set_drvdata(vdev, skel);
881 
882         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
883         if (ret)
884                 goto free_hdl;
885 
886         dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n");
887         return 0;
888 
889 free_hdl:
890         v4l2_ctrl_handler_free(&skel->ctrl_handler);
891         v4l2_device_unregister(&skel->v4l2_dev);
892 disable_pci:
893         pci_disable_device(pdev);
894         return ret;
895 }
896 
897 static void skeleton_remove(struct pci_dev *pdev)
898 {
899         struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
900         struct skeleton *skel = container_of(v4l2_dev, struct skeleton, v4l2_dev);
901 
902         video_unregister_device(&skel->vdev);
903         v4l2_ctrl_handler_free(&skel->ctrl_handler);
904         v4l2_device_unregister(&skel->v4l2_dev);
905         pci_disable_device(skel->pdev);
906 }
907 
908 static struct pci_driver skeleton_driver = {
909         .name = KBUILD_MODNAME,
910         .probe = skeleton_probe,
911         .remove = skeleton_remove,
912         .id_table = skeleton_pci_tbl,
913 };
914 
915 module_pci_driver(skeleton_driver);
916 

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