2 * This is a V4L2 PCI Skeleton Driver. It gives an initial skeleton source
3 * for use with other PCI drivers.
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.
8 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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.
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
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>
42 MODULE_DESCRIPTION("V4L2 PCI Skeleton Driver");
43 MODULE_AUTHOR("Hans Verkuil");
44 MODULE_LICENSE("GPL v2");
45 MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl);
48 * struct skeleton - All internal data for one instance of 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
66 struct v4l2_device v4l2_dev;
67 struct video_device vdev;
68 struct v4l2_ctrl_handler ctrl_handler;
71 struct v4l2_dv_timings timings;
72 struct v4l2_pix_format format;
75 struct vb2_queue queue;
76 struct vb2_alloc_ctx *alloc_ctx;
79 struct list_head buf_list;
86 struct list_head list;
89 static inline struct skel_buffer *to_skel_buffer(struct vb2_buffer *vb2)
91 return container_of(vb2, struct skel_buffer, vb);
94 static const struct pci_device_id skeleton_pci_tbl[] = {
95 /* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */
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.
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 */
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 */
114 V4L2_DV_BT_CAP_INTERLACED | V4L2_DV_BT_CAP_PROGRESSIVE
119 * Supported SDTV standards. This does the same job as skel_timings_cap, but
120 * for standard TV formats.
122 #define SKEL_TVNORMS V4L2_STD_ALL
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.
130 static irqreturn_t skeleton_irq(int irq, void *dev_id)
133 struct skeleton *skel = dev_id;
135 /* handle interrupt */
137 /* Once a new frame has been captured, mark it as done like this: */
138 if (captured_new_frame) {
140 spin_lock(&skel->qlock);
141 list_del(&new_buf->list);
142 spin_unlock(&skel->qlock);
143 v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
144 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;
152 vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
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.
165 static 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[])
169 struct skeleton *skel = vb2_get_drv_priv(vq);
171 skel->field = skel->format.field;
172 if (skel->field == V4L2_FIELD_ALTERNATE) {
174 * You cannot use read() with FIELD_ALTERNATE since the field
175 * information (TOP/BOTTOM) cannot be passed back to the user.
177 if (vb2_fileio_is_active(q))
179 skel->field = V4L2_FIELD_TOP;
182 if (vq->num_buffers + *nbuffers < 3)
183 *nbuffers = 3 - vq->num_buffers;
185 if (fmt && fmt->fmt.pix.sizeimage < skel->format.sizeimage)
188 sizes[0] = fmt ? fmt->fmt.pix.sizeimage : skel->format.sizeimage;
189 alloc_ctxs[0] = skel->alloc_ctx;
194 * Prepare the buffer for queueing to the DMA engine: check and set the
197 static int buffer_prepare(struct vb2_buffer *vb)
199 struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
200 unsigned long size = skel->format.sizeimage;
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);
208 vb2_set_plane_payload(vb, 0, size);
213 * Queue this buffer to the DMA engine.
215 static void buffer_queue(struct vb2_buffer *vb)
217 struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
218 struct skel_buffer *buf = to_skel_buffer(vb);
221 spin_lock_irqsave(&skel->qlock, flags);
222 list_add_tail(&buf->list, &skel->buf_list);
224 /* TODO: Update any DMA pointers if necessary */
226 spin_unlock_irqrestore(&skel->qlock, flags);
229 static void return_all_buffers(struct skeleton *skel,
230 enum vb2_buffer_state state)
232 struct skel_buffer *buf, *node;
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);
240 spin_unlock_irqrestore(&skel->qlock, flags);
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.
249 static int start_streaming(struct vb2_queue *vq, unsigned int count)
251 struct skeleton *skel = vb2_get_drv_priv(vq);
256 /* TODO: start DMA */
260 * In case of an error, return all active buffers to the
263 return_all_buffers(skel, VB2_BUF_STATE_QUEUED);
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.
272 static int stop_streaming(struct vb2_queue *vq)
274 struct skeleton *skel = vb2_get_drv_priv(vq);
278 /* Release all active buffers */
279 return_all_buffers(skel, VB2_BUF_STATE_ERROR);
284 * The vb2 queue ops. Note that since q->lock is set we can use the standard
285 * vb2_ops_wait_prepare/finish helper functions. If q->lock would be NULL,
286 * then this driver would have to provide these ops.
288 static struct vb2_ops skel_qops = {
289 .queue_setup = queue_setup,
290 .buf_prepare = buffer_prepare,
291 .buf_queue = buffer_queue,
292 .start_streaming = start_streaming,
293 .stop_streaming = stop_streaming,
294 .wait_prepare = vb2_ops_wait_prepare,
295 .wait_finish = vb2_ops_wait_finish,
299 * Required ioctl querycap. Note that the version field is prefilled with
300 * the version of the kernel.
302 static int skeleton_querycap(struct file *file, void *priv,
303 struct v4l2_capability *cap)
305 struct skeleton *skel = video_drvdata(file);
307 strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
308 strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card));
309 snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s",
310 pci_name(skel->pdev));
311 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
313 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
318 * Helper function to check and correct struct v4l2_pix_format. It's used
319 * not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV
320 * standard, HDTV timings or the video input would require updating the
323 static void skeleton_fill_pix_format(struct skeleton *skel,
324 struct v4l2_pix_format *pix)
326 pix->pixelformat = V4L2_PIX_FMT_YUYV;
327 if (skel->input == 0) {
330 pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576;
331 pix->field = V4L2_FIELD_INTERLACED;
332 pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
335 pix->width = skel->timings.bt.width;
336 pix->height = skel->timings.bt.height;
337 if (skel->timings.bt.interlaced) {
338 pix->field = V4L2_FIELD_ALTERNATE;
341 pix->field = V4L2_FIELD_NONE;
343 pix->colorspace = V4L2_COLORSPACE_REC709;
347 * The YUYV format is four bytes for every two pixels, so bytesperline
350 pix->bytesperline = pix->width * 2;
351 pix->sizeimage = pix->bytesperline * pix->height;
355 static int skeleton_try_fmt_vid_cap(struct file *file, void *priv,
356 struct v4l2_format *f)
358 struct skeleton *skel = video_drvdata(file);
359 struct v4l2_pix_format *pix = &f->fmt.pix;
362 * Due to historical reasons providing try_fmt with an unsupported
363 * pixelformat will return -EINVAL for video receivers. Webcam drivers,
364 * however, will silently correct the pixelformat. Some video capture
365 * applications rely on this behavior...
367 if (pix->pixelformat != V4L2_PIX_FMT_YUYV)
369 skeleton_fill_pix_format(skel, pix);
373 static int skeleton_s_fmt_vid_cap(struct file *file, void *priv,
374 struct v4l2_format *f)
376 struct skeleton *skel = video_drvdata(file);
379 ret = skeleton_try_fmt_vid_cap(file, priv, f);
384 * It is not allowed to change the format while buffers for use with
385 * streaming have already been allocated.
387 if (vb2_is_busy(&skel->queue))
390 /* TODO: change format */
391 skel->format = f->fmt.pix;
395 static int skeleton_g_fmt_vid_cap(struct file *file, void *priv,
396 struct v4l2_format *f)
398 struct skeleton *skel = video_drvdata(file);
400 f->fmt.pix = skel->format;
404 static int skeleton_enum_fmt_vid_cap(struct file *file, void *priv,
405 struct v4l2_fmtdesc *f)
410 strlcpy(f->description, "4:2:2, packed, YUYV", sizeof(f->description));
411 f->pixelformat = V4L2_PIX_FMT_YUYV;
416 static int skeleton_s_std(struct file *file, void *priv, v4l2_std_id std)
418 struct skeleton *skel = video_drvdata(file);
420 /* S_STD is not supported on the HDMI input */
425 * No change, so just return. Some applications call S_STD again after
426 * the buffers for streaming have been set up, so we have to allow for
429 if (std == skel->std)
433 * Changing the standard implies a format change, which is not allowed
434 * while buffers for use with streaming have already been allocated.
436 if (vb2_is_busy(&skel->queue))
439 /* TODO: handle changing std */
443 /* Update the internal format */
444 skeleton_fill_pix_format(skel, &skel->format);
448 static int skeleton_g_std(struct file *file, void *priv, v4l2_std_id *std)
450 struct skeleton *skel = video_drvdata(file);
452 /* G_STD is not supported on the HDMI input */
461 * Query the current standard as seen by the hardware. This function shall
462 * never actually change the standard, it just detects and reports.
463 * The framework will initially set *std to tvnorms (i.e. the set of
464 * supported standards by this input), and this function should just AND
465 * this value. If there is no signal, then *std should be set to 0.
467 static int skeleton_querystd(struct file *file, void *priv, v4l2_std_id *std)
469 struct skeleton *skel = video_drvdata(file);
471 /* QUERY_STD is not supported on the HDMI input */
477 * Query currently seen standard. Initial value of *std is
478 * V4L2_STD_ALL. This function should look something like this:
485 /* Use signal information to reduce the number of possible standards */
486 if (signal_has_525_lines)
487 *std &= V4L2_STD_525_60;
489 *std &= V4L2_STD_625_50;
494 static int skeleton_s_dv_timings(struct file *file, void *_fh,
495 struct v4l2_dv_timings *timings)
497 struct skeleton *skel = video_drvdata(file);
499 /* S_DV_TIMINGS is not supported on the S-Video input */
500 if (skel->input == 0)
503 /* Quick sanity check */
504 if (!v4l2_valid_dv_timings(timings, &skel_timings_cap, NULL, NULL))
507 /* Check if the timings are part of the CEA-861 timings. */
508 if (!v4l2_find_dv_timings_cap(timings, &skel_timings_cap,
512 /* Return 0 if the new timings are the same as the current timings. */
513 if (v4l2_match_dv_timings(timings, &skel->timings, 0))
517 * Changing the timings implies a format change, which is not allowed
518 * while buffers for use with streaming have already been allocated.
520 if (vb2_is_busy(&skel->queue))
523 /* TODO: Configure new timings */
526 skel->timings = *timings;
528 /* Update the internal format */
529 skeleton_fill_pix_format(skel, &skel->format);
533 static int skeleton_g_dv_timings(struct file *file, void *_fh,
534 struct v4l2_dv_timings *timings)
536 struct skeleton *skel = video_drvdata(file);
538 /* G_DV_TIMINGS is not supported on the S-Video input */
539 if (skel->input == 0)
542 *timings = skel->timings;
546 static int skeleton_enum_dv_timings(struct file *file, void *_fh,
547 struct v4l2_enum_dv_timings *timings)
549 struct skeleton *skel = video_drvdata(file);
551 /* ENUM_DV_TIMINGS is not supported on the S-Video input */
552 if (skel->input == 0)
555 return v4l2_enum_dv_timings_cap(timings, &skel_timings_cap,
560 * Query the current timings as seen by the hardware. This function shall
561 * never actually change the timings, it just detects and reports.
562 * If no signal is detected, then return -ENOLINK. If the hardware cannot
563 * lock to the signal, then return -ENOLCK. If the signal is out of range
564 * of the capabilities of the system (e.g., it is possible that the receiver
565 * can lock but that the DMA engine it is connected to cannot handle
566 * pixelclocks above a certain frequency), then -ERANGE is returned.
568 static int skeleton_query_dv_timings(struct file *file, void *_fh,
569 struct v4l2_dv_timings *timings)
571 struct skeleton *skel = video_drvdata(file);
573 /* QUERY_DV_TIMINGS is not supported on the S-Video input */
574 if (skel->input == 0)
579 * Query currently seen timings. This function should look
580 * something like this:
585 if (cannot_lock_to_signal)
587 if (signal_out_of_range_of_capabilities)
590 /* Useful for debugging */
591 v4l2_print_dv_timings(skel->v4l2_dev.name, "query_dv_timings:",
597 static int skeleton_dv_timings_cap(struct file *file, void *fh,
598 struct v4l2_dv_timings_cap *cap)
600 struct skeleton *skel = video_drvdata(file);
602 /* DV_TIMINGS_CAP is not supported on the S-Video input */
603 if (skel->input == 0)
605 *cap = skel_timings_cap;
609 static int skeleton_enum_input(struct file *file, void *priv,
610 struct v4l2_input *i)
615 i->type = V4L2_INPUT_TYPE_CAMERA;
617 i->std = SKEL_TVNORMS;
618 strlcpy(i->name, "S-Video", sizeof(i->name));
619 i->capabilities = V4L2_IN_CAP_STD;
622 strlcpy(i->name, "HDMI", sizeof(i->name));
623 i->capabilities = V4L2_IN_CAP_DV_TIMINGS;
628 static int skeleton_s_input(struct file *file, void *priv, unsigned int i)
630 struct skeleton *skel = video_drvdata(file);
636 * Changing the input implies a format change, which is not allowed
637 * while buffers for use with streaming have already been allocated.
639 if (vb2_is_busy(&skel->queue))
644 * Update tvnorms. The tvnorms value is used by the core to implement
645 * VIDIOC_ENUMSTD so it has to be correct. If tvnorms == 0, then
646 * ENUMSTD will return -ENODATA.
648 skel->vdev.tvnorms = i ? 0 : SKEL_TVNORMS;
650 /* Update the internal format */
651 skeleton_fill_pix_format(skel, &skel->format);
655 static int skeleton_g_input(struct file *file, void *priv, unsigned int *i)
657 struct skeleton *skel = video_drvdata(file);
663 /* The control handler. */
664 static int skeleton_s_ctrl(struct v4l2_ctrl *ctrl)
666 /*struct skeleton *skel =
667 container_of(ctrl->handler, struct skeleton, ctrl_handler);*/
670 case V4L2_CID_BRIGHTNESS:
671 /* TODO: set brightness to ctrl->val */
673 case V4L2_CID_CONTRAST:
674 /* TODO: set contrast to ctrl->val */
676 case V4L2_CID_SATURATION:
677 /* TODO: set saturation to ctrl->val */
680 /* TODO: set hue to ctrl->val */
688 /* ------------------------------------------------------------------
689 File operations for the device
690 ------------------------------------------------------------------*/
692 static const struct v4l2_ctrl_ops skel_ctrl_ops = {
693 .s_ctrl = skeleton_s_ctrl,
697 * The set of all supported ioctls. Note that all the streaming ioctls
698 * use the vb2 helper functions that take care of all the locking and
699 * that also do ownership tracking (i.e. only the filehandle that requested
700 * the buffers can call the streaming ioctls, all other filehandles will
701 * receive -EBUSY if they attempt to call the same streaming ioctls).
703 * The last three ioctls also use standard helper functions: these implement
704 * standard behavior for drivers with controls.
706 static const struct v4l2_ioctl_ops skel_ioctl_ops = {
707 .vidioc_querycap = skeleton_querycap,
708 .vidioc_try_fmt_vid_cap = skeleton_try_fmt_vid_cap,
709 .vidioc_s_fmt_vid_cap = skeleton_s_fmt_vid_cap,
710 .vidioc_g_fmt_vid_cap = skeleton_g_fmt_vid_cap,
711 .vidioc_enum_fmt_vid_cap = skeleton_enum_fmt_vid_cap,
713 .vidioc_g_std = skeleton_g_std,
714 .vidioc_s_std = skeleton_s_std,
715 .vidioc_querystd = skeleton_querystd,
717 .vidioc_s_dv_timings = skeleton_s_dv_timings,
718 .vidioc_g_dv_timings = skeleton_g_dv_timings,
719 .vidioc_enum_dv_timings = skeleton_enum_dv_timings,
720 .vidioc_query_dv_timings = skeleton_query_dv_timings,
721 .vidioc_dv_timings_cap = skeleton_dv_timings_cap,
723 .vidioc_enum_input = skeleton_enum_input,
724 .vidioc_g_input = skeleton_g_input,
725 .vidioc_s_input = skeleton_s_input,
727 .vidioc_reqbufs = vb2_ioctl_reqbufs,
728 .vidioc_create_bufs = vb2_ioctl_create_bufs,
729 .vidioc_querybuf = vb2_ioctl_querybuf,
730 .vidioc_qbuf = vb2_ioctl_qbuf,
731 .vidioc_dqbuf = vb2_ioctl_dqbuf,
732 .vidioc_expbuf = vb2_ioctl_expbuf,
733 .vidioc_streamon = vb2_ioctl_streamon,
734 .vidioc_streamoff = vb2_ioctl_streamoff,
736 .vidioc_log_status = v4l2_ctrl_log_status,
737 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
738 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
742 * The set of file operations. Note that all these ops are standard core
745 static const struct v4l2_file_operations skel_fops = {
746 .owner = THIS_MODULE,
747 .open = v4l2_fh_open,
748 .release = vb2_fop_release,
749 .unlocked_ioctl = video_ioctl2,
750 .read = vb2_fop_read,
751 .mmap = vb2_fop_mmap,
752 .poll = vb2_fop_poll,
756 * The initial setup of this device instance. Note that the initial state of
757 * the driver should be complete. So the initial format, standard, timings
758 * and video input should all be initialized to some reasonable value.
760 static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
762 /* The initial timings are chosen to be 720p60. */
763 static const struct v4l2_dv_timings timings_def =
764 V4L2_DV_BT_CEA_1280X720P60;
765 struct skeleton *skel;
766 struct video_device *vdev;
767 struct v4l2_ctrl_handler *hdl;
772 ret = pci_enable_device(pdev);
775 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
777 dev_err(&pdev->dev, "no suitable DMA available.\n");
781 /* Allocate a new instance */
782 skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL);
786 /* Allocate the interrupt */
787 ret = devm_request_irq(&pdev->dev, pdev->irq,
788 skeleton_irq, 0, KBUILD_MODNAME, skel);
790 dev_err(&pdev->dev, "request_irq failed\n");
795 /* Fill in the initial format-related settings */
796 skel->timings = timings_def;
797 skel->std = V4L2_STD_625_50;
798 skeleton_fill_pix_format(skel, &skel->format);
800 /* Initialize the top-level structure */
801 ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev);
805 mutex_init(&skel->lock);
807 /* Add the controls */
808 hdl = &skel->ctrl_handler;
809 v4l2_ctrl_handler_init(hdl, 4);
810 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
811 V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
812 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
813 V4L2_CID_CONTRAST, 0, 255, 1, 16);
814 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
815 V4L2_CID_SATURATION, 0, 255, 1, 127);
816 v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
817 V4L2_CID_HUE, -128, 127, 1, 0);
822 skel->v4l2_dev.ctrl_handler = hdl;
824 /* Initialize the vb2 queue */
826 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
827 q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
829 q->buf_struct_size = sizeof(struct skel_buffer);
831 q->mem_ops = &vb2_dma_contig_memops;
832 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
834 * Assume that this DMA engine needs to have at least two buffers
835 * available before it can be started. The start_streaming() op
836 * won't be called until at least this many buffers are queued up.
838 q->min_buffers_needed = 2;
840 * The serialization lock for the streaming ioctls. This is the same
841 * as the main serialization lock, but if some of the non-streaming
842 * ioctls could take a long time to execute, then you might want to
843 * have a different lock here to prevent VIDIOC_DQBUF from being
844 * blocked while waiting for another action to finish. This is
845 * generally not needed for PCI devices, but USB devices usually do
846 * want a separate lock here.
848 q->lock = &skel->lock;
850 * Since this driver can only do 32-bit DMA we must make sure that
851 * the vb2 core will allocate the buffers in 32-bit DMA memory.
853 q->gfp_flags = GFP_DMA32;
854 ret = vb2_queue_init(q);
858 skel->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
859 if (IS_ERR(skel->alloc_ctx)) {
860 dev_err(&pdev->dev, "Can't allocate buffer context");
861 ret = PTR_ERR(skel->alloc_ctx);
864 INIT_LIST_HEAD(&skel->buf_list);
865 spin_lock_init(&skel->qlock);
867 /* Initialize the video_device structure */
869 strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
871 * There is nothing to clean up, so release is set to an empty release
872 * function. The release callback must be non-NULL.
874 vdev->release = video_device_release_empty;
875 vdev->fops = &skel_fops,
876 vdev->ioctl_ops = &skel_ioctl_ops,
878 * The main serialization lock. All ioctls are serialized by this
879 * lock. Exception: if q->lock is set, then the streaming ioctls
880 * are serialized by that separate lock.
882 vdev->lock = &skel->lock;
884 vdev->v4l2_dev = &skel->v4l2_dev;
885 /* Supported SDTV standards, if any */
886 vdev->tvnorms = SKEL_TVNORMS;
887 /* If this bit is set, then the v4l2 core will provide the support
888 * for the VIDIOC_G/S_PRIORITY ioctls. This flag will eventually
889 * go away once all drivers have been converted to use struct v4l2_fh.
891 set_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags);
892 video_set_drvdata(vdev, skel);
894 ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
898 dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n");
902 vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
904 v4l2_ctrl_handler_free(&skel->ctrl_handler);
905 v4l2_device_unregister(&skel->v4l2_dev);
907 pci_disable_device(pdev);
911 static void skeleton_remove(struct pci_dev *pdev)
913 struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
914 struct skeleton *skel = container_of(v4l2_dev, struct skeleton, v4l2_dev);
916 video_unregister_device(&skel->vdev);
917 v4l2_ctrl_handler_free(&skel->ctrl_handler);
918 vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
919 v4l2_device_unregister(&skel->v4l2_dev);
920 pci_disable_device(skel->pdev);
923 static struct pci_driver skeleton_driver = {
924 .name = KBUILD_MODNAME,
925 .probe = skeleton_probe,
926 .remove = skeleton_remove,
927 .id_table = skeleton_pci_tbl,
930 module_pci_driver(skeleton_driver);