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Hans Verkuil926977e2014-03-14 08:38:21 -03001/*
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-dma-contig.h>
41
42MODULE_DESCRIPTION("V4L2 PCI Skeleton Driver");
43MODULE_AUTHOR("Hans Verkuil");
44MODULE_LICENSE("GPL v2");
45MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl);
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 * @alloc_ctx: vb2 contiguous DMA context
60 * @qlock: spinlock controlling access to buf_list and sequence
61 * @buf_list: list of buffers queued for DMA
62 * @sequence: frame sequence counter
63 */
64struct 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 struct vb2_alloc_ctx *alloc_ctx;
77
78 spinlock_t qlock;
79 struct list_head buf_list;
Hans Verkuil5f26f252014-04-11 05:02:29 -030080 unsigned field;
81 unsigned sequence;
Hans Verkuil926977e2014-03-14 08:38:21 -030082};
83
84struct skel_buffer {
85 struct vb2_buffer vb;
86 struct list_head list;
87};
88
89static inline struct skel_buffer *to_skel_buffer(struct vb2_buffer *vb2)
90{
91 return container_of(vb2, struct skel_buffer, vb);
92}
93
94static const struct pci_device_id skeleton_pci_tbl[] = {
95 /* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */
96 { 0, }
97};
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 */
104static 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
Hans Verkuil5f26f252014-04-11 05:02:29 -0300128 * counter, field and timestamp at the same time.
Hans Verkuil926977e2014-03-14 08:38:21 -0300129 */
130static 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);
Hans Verkuil926977e2014-03-14 08:38:21 -0300143 v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
Hans Verkuil5f26f252014-04-11 05:02:29 -0300144 new_buf->vb.v4l2_buf.sequence = skel->sequence++;
145 new_buf->vb.v4l2_buf.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 }
Hans Verkuil926977e2014-03-14 08:38:21 -0300152 vb2_buffer_done(&new_buf->vb, 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 */
165static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
166 unsigned int *nbuffers, unsigned int *nplanes,
167 unsigned int sizes[], void *alloc_ctxs[])
168{
169 struct skeleton *skel = vb2_get_drv_priv(vq);
170
Hans Verkuil5f26f252014-04-11 05:02:29 -0300171 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 */
Hans Verkuil3130a282014-04-23 11:32:11 -0300177 if (vb2_fileio_is_active(vq))
Hans Verkuil5f26f252014-04-11 05:02:29 -0300178 return -EINVAL;
179 skel->field = V4L2_FIELD_TOP;
180 }
181
Hans Verkuil926977e2014-03-14 08:38:21 -0300182 if (vq->num_buffers + *nbuffers < 3)
183 *nbuffers = 3 - vq->num_buffers;
184
185 if (fmt && fmt->fmt.pix.sizeimage < skel->format.sizeimage)
186 return -EINVAL;
187 *nplanes = 1;
188 sizes[0] = fmt ? fmt->fmt.pix.sizeimage : skel->format.sizeimage;
189 alloc_ctxs[0] = skel->alloc_ctx;
190 return 0;
191}
192
193/*
194 * Prepare the buffer for queueing to the DMA engine: check and set the
Hans Verkuil5f26f252014-04-11 05:02:29 -0300195 * payload size.
Hans Verkuil926977e2014-03-14 08:38:21 -0300196 */
197static int buffer_prepare(struct vb2_buffer *vb)
198{
199 struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
200 unsigned long size = skel->format.sizeimage;
201
202 if (vb2_plane_size(vb, 0) < size) {
203 dev_err(&skel->pdev->dev, "buffer too small (%lu < %lu)\n",
204 vb2_plane_size(vb, 0), size);
205 return -EINVAL;
206 }
207
208 vb2_set_plane_payload(vb, 0, size);
Hans Verkuil926977e2014-03-14 08:38:21 -0300209 return 0;
210}
211
212/*
213 * Queue this buffer to the DMA engine.
214 */
215static void buffer_queue(struct vb2_buffer *vb)
216{
217 struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
218 struct skel_buffer *buf = to_skel_buffer(vb);
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
229static 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, 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 */
249static 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 */
Hans Verkuile37559b2014-04-17 02:47:21 -0300272static void stop_streaming(struct vb2_queue *vq)
Hans Verkuil926977e2014-03-14 08:38:21 -0300273{
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);
Hans Verkuil926977e2014-03-14 08:38:21 -0300280}
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 */
287static 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 */
301static 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 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
311 V4L2_CAP_STREAMING;
312 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
313 return 0;
314}
315
316/*
317 * Helper function to check and correct struct v4l2_pix_format. It's used
318 * not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV
319 * standard, HDTV timings or the video input would require updating the
320 * current format.
321 */
322static void skeleton_fill_pix_format(struct skeleton *skel,
323 struct v4l2_pix_format *pix)
324{
325 pix->pixelformat = V4L2_PIX_FMT_YUYV;
326 if (skel->input == 0) {
327 /* S-Video input */
328 pix->width = 720;
329 pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576;
330 pix->field = V4L2_FIELD_INTERLACED;
331 pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
332 } else {
333 /* HDMI input */
334 pix->width = skel->timings.bt.width;
335 pix->height = skel->timings.bt.height;
Hans Verkuil5f26f252014-04-11 05:02:29 -0300336 if (skel->timings.bt.interlaced) {
337 pix->field = V4L2_FIELD_ALTERNATE;
338 pix->height /= 2;
339 } else {
Hans Verkuil926977e2014-03-14 08:38:21 -0300340 pix->field = V4L2_FIELD_NONE;
Hans Verkuil5f26f252014-04-11 05:02:29 -0300341 }
Hans Verkuil926977e2014-03-14 08:38:21 -0300342 pix->colorspace = V4L2_COLORSPACE_REC709;
343 }
344
345 /*
346 * The YUYV format is four bytes for every two pixels, so bytesperline
347 * is width * 2.
348 */
349 pix->bytesperline = pix->width * 2;
350 pix->sizeimage = pix->bytesperline * pix->height;
351 pix->priv = 0;
352}
353
354static int skeleton_try_fmt_vid_cap(struct file *file, void *priv,
355 struct v4l2_format *f)
356{
357 struct skeleton *skel = video_drvdata(file);
358 struct v4l2_pix_format *pix = &f->fmt.pix;
359
360 /*
361 * Due to historical reasons providing try_fmt with an unsupported
362 * pixelformat will return -EINVAL for video receivers. Webcam drivers,
363 * however, will silently correct the pixelformat. Some video capture
364 * applications rely on this behavior...
365 */
366 if (pix->pixelformat != V4L2_PIX_FMT_YUYV)
367 return -EINVAL;
368 skeleton_fill_pix_format(skel, pix);
369 return 0;
370}
371
372static int skeleton_s_fmt_vid_cap(struct file *file, void *priv,
373 struct v4l2_format *f)
374{
375 struct skeleton *skel = video_drvdata(file);
376 int ret;
377
378 ret = skeleton_try_fmt_vid_cap(file, priv, f);
379 if (ret)
380 return ret;
381
382 /*
383 * It is not allowed to change the format while buffers for use with
384 * streaming have already been allocated.
385 */
386 if (vb2_is_busy(&skel->queue))
387 return -EBUSY;
388
389 /* TODO: change format */
390 skel->format = f->fmt.pix;
391 return 0;
392}
393
394static int skeleton_g_fmt_vid_cap(struct file *file, void *priv,
395 struct v4l2_format *f)
396{
397 struct skeleton *skel = video_drvdata(file);
398
399 f->fmt.pix = skel->format;
400 return 0;
401}
402
403static int skeleton_enum_fmt_vid_cap(struct file *file, void *priv,
404 struct v4l2_fmtdesc *f)
405{
406 if (f->index != 0)
407 return -EINVAL;
408
409 strlcpy(f->description, "4:2:2, packed, YUYV", sizeof(f->description));
410 f->pixelformat = V4L2_PIX_FMT_YUYV;
411 f->flags = 0;
412 return 0;
413}
414
415static int skeleton_s_std(struct file *file, void *priv, v4l2_std_id std)
416{
417 struct skeleton *skel = video_drvdata(file);
418
419 /* S_STD is not supported on the HDMI input */
420 if (skel->input)
421 return -ENODATA;
422
423 /*
424 * No change, so just return. Some applications call S_STD again after
425 * the buffers for streaming have been set up, so we have to allow for
426 * this behavior.
427 */
428 if (std == skel->std)
429 return 0;
430
431 /*
432 * Changing the standard implies a format change, which is not allowed
433 * while buffers for use with streaming have already been allocated.
434 */
435 if (vb2_is_busy(&skel->queue))
436 return -EBUSY;
437
438 /* TODO: handle changing std */
439
440 skel->std = std;
441
442 /* Update the internal format */
443 skeleton_fill_pix_format(skel, &skel->format);
444 return 0;
445}
446
447static int skeleton_g_std(struct file *file, void *priv, v4l2_std_id *std)
448{
449 struct skeleton *skel = video_drvdata(file);
450
451 /* G_STD is not supported on the HDMI input */
452 if (skel->input)
453 return -ENODATA;
454
455 *std = skel->std;
456 return 0;
457}
458
459/*
460 * Query the current standard as seen by the hardware. This function shall
461 * never actually change the standard, it just detects and reports.
462 * The framework will initially set *std to tvnorms (i.e. the set of
463 * supported standards by this input), and this function should just AND
464 * this value. If there is no signal, then *std should be set to 0.
465 */
466static int skeleton_querystd(struct file *file, void *priv, v4l2_std_id *std)
467{
468 struct skeleton *skel = video_drvdata(file);
469
470 /* QUERY_STD is not supported on the HDMI input */
471 if (skel->input)
472 return -ENODATA;
473
474#ifdef TODO
475 /*
476 * Query currently seen standard. Initial value of *std is
477 * V4L2_STD_ALL. This function should look something like this:
478 */
479 get_signal_info();
480 if (no_signal) {
481 *std = 0;
482 return 0;
483 }
484 /* Use signal information to reduce the number of possible standards */
485 if (signal_has_525_lines)
486 *std &= V4L2_STD_525_60;
487 else
488 *std &= V4L2_STD_625_50;
489#endif
490 return 0;
491}
492
493static int skeleton_s_dv_timings(struct file *file, void *_fh,
494 struct v4l2_dv_timings *timings)
495{
496 struct skeleton *skel = video_drvdata(file);
497
498 /* S_DV_TIMINGS is not supported on the S-Video input */
499 if (skel->input == 0)
500 return -ENODATA;
501
502 /* Quick sanity check */
503 if (!v4l2_valid_dv_timings(timings, &skel_timings_cap, NULL, NULL))
504 return -EINVAL;
505
506 /* Check if the timings are part of the CEA-861 timings. */
507 if (!v4l2_find_dv_timings_cap(timings, &skel_timings_cap,
508 0, NULL, NULL))
509 return -EINVAL;
510
511 /* Return 0 if the new timings are the same as the current timings. */
512 if (v4l2_match_dv_timings(timings, &skel->timings, 0))
513 return 0;
514
515 /*
516 * Changing the timings implies a format change, which is not allowed
517 * while buffers for use with streaming have already been allocated.
518 */
519 if (vb2_is_busy(&skel->queue))
520 return -EBUSY;
521
522 /* TODO: Configure new timings */
523
524 /* Save timings */
525 skel->timings = *timings;
526
527 /* Update the internal format */
528 skeleton_fill_pix_format(skel, &skel->format);
529 return 0;
530}
531
532static int skeleton_g_dv_timings(struct file *file, void *_fh,
533 struct v4l2_dv_timings *timings)
534{
535 struct skeleton *skel = video_drvdata(file);
536
537 /* G_DV_TIMINGS is not supported on the S-Video input */
538 if (skel->input == 0)
539 return -ENODATA;
540
541 *timings = skel->timings;
542 return 0;
543}
544
545static int skeleton_enum_dv_timings(struct file *file, void *_fh,
546 struct v4l2_enum_dv_timings *timings)
547{
548 struct skeleton *skel = video_drvdata(file);
549
550 /* ENUM_DV_TIMINGS is not supported on the S-Video input */
551 if (skel->input == 0)
552 return -ENODATA;
553
554 return v4l2_enum_dv_timings_cap(timings, &skel_timings_cap,
555 NULL, NULL);
556}
557
558/*
559 * Query the current timings as seen by the hardware. This function shall
560 * never actually change the timings, it just detects and reports.
561 * If no signal is detected, then return -ENOLINK. If the hardware cannot
562 * lock to the signal, then return -ENOLCK. If the signal is out of range
563 * of the capabilities of the system (e.g., it is possible that the receiver
564 * can lock but that the DMA engine it is connected to cannot handle
565 * pixelclocks above a certain frequency), then -ERANGE is returned.
566 */
567static int skeleton_query_dv_timings(struct file *file, void *_fh,
568 struct v4l2_dv_timings *timings)
569{
570 struct skeleton *skel = video_drvdata(file);
571
572 /* QUERY_DV_TIMINGS is not supported on the S-Video input */
573 if (skel->input == 0)
574 return -ENODATA;
575
576#ifdef TODO
577 /*
578 * Query currently seen timings. This function should look
579 * something like this:
580 */
581 detect_timings();
582 if (no_signal)
583 return -ENOLINK;
584 if (cannot_lock_to_signal)
585 return -ENOLCK;
586 if (signal_out_of_range_of_capabilities)
587 return -ERANGE;
588
589 /* Useful for debugging */
590 v4l2_print_dv_timings(skel->v4l2_dev.name, "query_dv_timings:",
591 timings, true);
592#endif
593 return 0;
594}
595
596static int skeleton_dv_timings_cap(struct file *file, void *fh,
597 struct v4l2_dv_timings_cap *cap)
598{
599 struct skeleton *skel = video_drvdata(file);
600
601 /* DV_TIMINGS_CAP is not supported on the S-Video input */
602 if (skel->input == 0)
603 return -ENODATA;
604 *cap = skel_timings_cap;
605 return 0;
606}
607
608static int skeleton_enum_input(struct file *file, void *priv,
609 struct v4l2_input *i)
610{
611 if (i->index > 1)
612 return -EINVAL;
613
614 i->type = V4L2_INPUT_TYPE_CAMERA;
615 if (i->index == 0) {
616 i->std = SKEL_TVNORMS;
617 strlcpy(i->name, "S-Video", sizeof(i->name));
618 i->capabilities = V4L2_IN_CAP_STD;
619 } else {
620 i->std = 0;
621 strlcpy(i->name, "HDMI", sizeof(i->name));
622 i->capabilities = V4L2_IN_CAP_DV_TIMINGS;
623 }
624 return 0;
625}
626
627static int skeleton_s_input(struct file *file, void *priv, unsigned int i)
628{
629 struct skeleton *skel = video_drvdata(file);
630
631 if (i > 1)
632 return -EINVAL;
633
634 /*
635 * Changing the input implies a format change, which is not allowed
636 * while buffers for use with streaming have already been allocated.
637 */
638 if (vb2_is_busy(&skel->queue))
639 return -EBUSY;
640
641 skel->input = i;
642 /*
643 * Update tvnorms. The tvnorms value is used by the core to implement
644 * VIDIOC_ENUMSTD so it has to be correct. If tvnorms == 0, then
645 * ENUMSTD will return -ENODATA.
646 */
647 skel->vdev.tvnorms = i ? 0 : SKEL_TVNORMS;
648
649 /* Update the internal format */
650 skeleton_fill_pix_format(skel, &skel->format);
651 return 0;
652}
653
654static int skeleton_g_input(struct file *file, void *priv, unsigned int *i)
655{
656 struct skeleton *skel = video_drvdata(file);
657
658 *i = skel->input;
659 return 0;
660}
661
662/* The control handler. */
663static int skeleton_s_ctrl(struct v4l2_ctrl *ctrl)
664{
665 /*struct skeleton *skel =
666 container_of(ctrl->handler, struct skeleton, ctrl_handler);*/
667
668 switch (ctrl->id) {
669 case V4L2_CID_BRIGHTNESS:
670 /* TODO: set brightness to ctrl->val */
671 break;
672 case V4L2_CID_CONTRAST:
673 /* TODO: set contrast to ctrl->val */
674 break;
675 case V4L2_CID_SATURATION:
676 /* TODO: set saturation to ctrl->val */
677 break;
678 case V4L2_CID_HUE:
679 /* TODO: set hue to ctrl->val */
680 break;
681 default:
682 return -EINVAL;
683 }
684 return 0;
685}
686
687/* ------------------------------------------------------------------
688 File operations for the device
689 ------------------------------------------------------------------*/
690
691static const struct v4l2_ctrl_ops skel_ctrl_ops = {
692 .s_ctrl = skeleton_s_ctrl,
693};
694
695/*
696 * The set of all supported ioctls. Note that all the streaming ioctls
697 * use the vb2 helper functions that take care of all the locking and
698 * that also do ownership tracking (i.e. only the filehandle that requested
699 * the buffers can call the streaming ioctls, all other filehandles will
700 * receive -EBUSY if they attempt to call the same streaming ioctls).
701 *
702 * The last three ioctls also use standard helper functions: these implement
703 * standard behavior for drivers with controls.
704 */
705static const struct v4l2_ioctl_ops skel_ioctl_ops = {
706 .vidioc_querycap = skeleton_querycap,
707 .vidioc_try_fmt_vid_cap = skeleton_try_fmt_vid_cap,
708 .vidioc_s_fmt_vid_cap = skeleton_s_fmt_vid_cap,
709 .vidioc_g_fmt_vid_cap = skeleton_g_fmt_vid_cap,
710 .vidioc_enum_fmt_vid_cap = skeleton_enum_fmt_vid_cap,
711
712 .vidioc_g_std = skeleton_g_std,
713 .vidioc_s_std = skeleton_s_std,
714 .vidioc_querystd = skeleton_querystd,
715
716 .vidioc_s_dv_timings = skeleton_s_dv_timings,
717 .vidioc_g_dv_timings = skeleton_g_dv_timings,
718 .vidioc_enum_dv_timings = skeleton_enum_dv_timings,
719 .vidioc_query_dv_timings = skeleton_query_dv_timings,
720 .vidioc_dv_timings_cap = skeleton_dv_timings_cap,
721
722 .vidioc_enum_input = skeleton_enum_input,
723 .vidioc_g_input = skeleton_g_input,
724 .vidioc_s_input = skeleton_s_input,
725
726 .vidioc_reqbufs = vb2_ioctl_reqbufs,
727 .vidioc_create_bufs = vb2_ioctl_create_bufs,
728 .vidioc_querybuf = vb2_ioctl_querybuf,
729 .vidioc_qbuf = vb2_ioctl_qbuf,
730 .vidioc_dqbuf = vb2_ioctl_dqbuf,
731 .vidioc_expbuf = vb2_ioctl_expbuf,
732 .vidioc_streamon = vb2_ioctl_streamon,
733 .vidioc_streamoff = vb2_ioctl_streamoff,
734
735 .vidioc_log_status = v4l2_ctrl_log_status,
736 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
737 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
738};
739
740/*
741 * The set of file operations. Note that all these ops are standard core
742 * helper functions.
743 */
744static const struct v4l2_file_operations skel_fops = {
745 .owner = THIS_MODULE,
746 .open = v4l2_fh_open,
747 .release = vb2_fop_release,
748 .unlocked_ioctl = video_ioctl2,
749 .read = vb2_fop_read,
750 .mmap = vb2_fop_mmap,
751 .poll = vb2_fop_poll,
752};
753
754/*
755 * The initial setup of this device instance. Note that the initial state of
756 * the driver should be complete. So the initial format, standard, timings
757 * and video input should all be initialized to some reasonable value.
758 */
759static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
760{
761 /* The initial timings are chosen to be 720p60. */
762 static const struct v4l2_dv_timings timings_def =
763 V4L2_DV_BT_CEA_1280X720P60;
764 struct skeleton *skel;
765 struct video_device *vdev;
766 struct v4l2_ctrl_handler *hdl;
767 struct vb2_queue *q;
768 int ret;
769
770 /* Enable PCI */
771 ret = pci_enable_device(pdev);
772 if (ret)
773 return ret;
774 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
775 if (ret) {
776 dev_err(&pdev->dev, "no suitable DMA available.\n");
777 goto disable_pci;
778 }
779
780 /* Allocate a new instance */
781 skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL);
782 if (!skel)
783 return -ENOMEM;
784
785 /* Allocate the interrupt */
786 ret = devm_request_irq(&pdev->dev, pdev->irq,
787 skeleton_irq, 0, KBUILD_MODNAME, skel);
788 if (ret) {
789 dev_err(&pdev->dev, "request_irq failed\n");
790 goto disable_pci;
791 }
792 skel->pdev = pdev;
793
794 /* Fill in the initial format-related settings */
795 skel->timings = timings_def;
796 skel->std = V4L2_STD_625_50;
797 skeleton_fill_pix_format(skel, &skel->format);
798
799 /* Initialize the top-level structure */
800 ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev);
801 if (ret)
802 goto disable_pci;
803
804 mutex_init(&skel->lock);
805
806 /* Add the controls */
807 hdl = &skel->ctrl_handler;
808 v4l2_ctrl_handler_init(hdl, 4);
809 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
810 V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
811 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
812 V4L2_CID_CONTRAST, 0, 255, 1, 16);
813 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
814 V4L2_CID_SATURATION, 0, 255, 1, 127);
815 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
816 V4L2_CID_HUE, -128, 127, 1, 0);
817 if (hdl->error) {
818 ret = hdl->error;
819 goto free_hdl;
820 }
821 skel->v4l2_dev.ctrl_handler = hdl;
822
823 /* Initialize the vb2 queue */
824 q = &skel->queue;
825 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
826 q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
827 q->drv_priv = skel;
828 q->buf_struct_size = sizeof(struct skel_buffer);
829 q->ops = &skel_qops;
830 q->mem_ops = &vb2_dma_contig_memops;
831 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
832 /*
833 * Assume that this DMA engine needs to have at least two buffers
834 * available before it can be started. The start_streaming() op
835 * won't be called until at least this many buffers are queued up.
836 */
837 q->min_buffers_needed = 2;
838 /*
839 * The serialization lock for the streaming ioctls. This is the same
840 * as the main serialization lock, but if some of the non-streaming
841 * ioctls could take a long time to execute, then you might want to
842 * have a different lock here to prevent VIDIOC_DQBUF from being
843 * blocked while waiting for another action to finish. This is
844 * generally not needed for PCI devices, but USB devices usually do
845 * want a separate lock here.
846 */
847 q->lock = &skel->lock;
848 /*
849 * Since this driver can only do 32-bit DMA we must make sure that
850 * the vb2 core will allocate the buffers in 32-bit DMA memory.
851 */
852 q->gfp_flags = GFP_DMA32;
853 ret = vb2_queue_init(q);
854 if (ret)
855 goto free_hdl;
856
857 skel->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
858 if (IS_ERR(skel->alloc_ctx)) {
859 dev_err(&pdev->dev, "Can't allocate buffer context");
860 ret = PTR_ERR(skel->alloc_ctx);
861 goto free_hdl;
862 }
863 INIT_LIST_HEAD(&skel->buf_list);
864 spin_lock_init(&skel->qlock);
865
866 /* Initialize the video_device structure */
867 vdev = &skel->vdev;
868 strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
869 /*
870 * There is nothing to clean up, so release is set to an empty release
871 * function. The release callback must be non-NULL.
872 */
873 vdev->release = video_device_release_empty;
874 vdev->fops = &skel_fops,
875 vdev->ioctl_ops = &skel_ioctl_ops,
876 /*
877 * The main serialization lock. All ioctls are serialized by this
878 * lock. Exception: if q->lock is set, then the streaming ioctls
879 * are serialized by that separate lock.
880 */
881 vdev->lock = &skel->lock;
882 vdev->queue = q;
883 vdev->v4l2_dev = &skel->v4l2_dev;
884 /* Supported SDTV standards, if any */
885 vdev->tvnorms = SKEL_TVNORMS;
886 /* If this bit is set, then the v4l2 core will provide the support
887 * for the VIDIOC_G/S_PRIORITY ioctls. This flag will eventually
888 * go away once all drivers have been converted to use struct v4l2_fh.
889 */
890 set_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags);
891 video_set_drvdata(vdev, skel);
892
893 ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
894 if (ret)
895 goto free_ctx;
896
897 dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n");
898 return 0;
899
900free_ctx:
901 vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
902free_hdl:
903 v4l2_ctrl_handler_free(&skel->ctrl_handler);
904 v4l2_device_unregister(&skel->v4l2_dev);
905disable_pci:
906 pci_disable_device(pdev);
907 return ret;
908}
909
910static void skeleton_remove(struct pci_dev *pdev)
911{
912 struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
913 struct skeleton *skel = container_of(v4l2_dev, struct skeleton, v4l2_dev);
914
915 video_unregister_device(&skel->vdev);
916 v4l2_ctrl_handler_free(&skel->ctrl_handler);
917 vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
918 v4l2_device_unregister(&skel->v4l2_dev);
919 pci_disable_device(skel->pdev);
920}
921
922static struct pci_driver skeleton_driver = {
923 .name = KBUILD_MODNAME,
924 .probe = skeleton_probe,
925 .remove = skeleton_remove,
926 .id_table = skeleton_pci_tbl,
927};
928
929module_pci_driver(skeleton_driver);