mirror of https://gitee.com/openkylin/linux.git
[media] v4l2-pci-skeleton: add a V4L2 PCI skeleton driver
This example driver uses all the latest frameworks and can serve as a starting point for a new V4L2 PCI driver. Originally written for a presentation on how to use V4L2 frameworks during FOSDEM 2014. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
b9e28d1f83
commit
926977e0ae
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@ -34,6 +34,10 @@ So this framework sets up the basic building blocks that all drivers
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need and this same framework should make it much easier to refactor
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need and this same framework should make it much easier to refactor
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common code into utility functions shared by all drivers.
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common code into utility functions shared by all drivers.
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A good example to look at as a reference is the v4l2-pci-skeleton.c
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source that is available in this directory. It is a skeleton driver for
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a PCI capture card, and demonstrates how to use the V4L2 driver
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framework. It can be used as a template for real PCI video capture driver.
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Structure of a driver
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Structure of a driver
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---------------------
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---------------------
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@ -0,0 +1,913 @@
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/*
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* This is a V4L2 PCI Skeleton Driver. It gives an initial skeleton source
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* for use with other PCI drivers.
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*
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* This skeleton PCI driver assumes that the card has an S-Video connector as
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* input 0 and an HDMI connector as input 1.
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*
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* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/videodev2.h>
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#include <linux/v4l2-dv-timings.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-dv-timings.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include <media/videobuf2-dma-contig.h>
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MODULE_DESCRIPTION("V4L2 PCI Skeleton Driver");
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_LICENSE("GPL v2");
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MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl);
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/**
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* struct skeleton - All internal data for one instance of device
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* @pdev: PCI device
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* @v4l2_dev: top-level v4l2 device struct
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* @vdev: video node structure
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* @ctrl_handler: control handler structure
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* @lock: ioctl serialization mutex
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* @std: current SDTV standard
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* @timings: current HDTV timings
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* @format: current pix format
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* @input: current video input (0 = SDTV, 1 = HDTV)
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* @queue: vb2 video capture queue
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* @alloc_ctx: vb2 contiguous DMA context
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* @qlock: spinlock controlling access to buf_list and sequence
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* @buf_list: list of buffers queued for DMA
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* @sequence: frame sequence counter
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*/
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struct skeleton {
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struct pci_dev *pdev;
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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struct mutex lock;
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v4l2_std_id std;
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struct v4l2_dv_timings timings;
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struct v4l2_pix_format format;
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unsigned input;
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struct vb2_queue queue;
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struct vb2_alloc_ctx *alloc_ctx;
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spinlock_t qlock;
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struct list_head buf_list;
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unsigned int sequence;
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};
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struct skel_buffer {
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struct vb2_buffer vb;
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struct list_head list;
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};
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static inline struct skel_buffer *to_skel_buffer(struct vb2_buffer *vb2)
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{
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return container_of(vb2, struct skel_buffer, vb);
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}
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static const struct pci_device_id skeleton_pci_tbl[] = {
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/* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */
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{ 0, }
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};
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/*
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* HDTV: this structure has the capabilities of the HDTV receiver.
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* It is used to constrain the huge list of possible formats based
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* upon the hardware capabilities.
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*/
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static const struct v4l2_dv_timings_cap skel_timings_cap = {
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.type = V4L2_DV_BT_656_1120,
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/* keep this initialization for compatibility with GCC < 4.4.6 */
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.reserved = { 0 },
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V4L2_INIT_BT_TIMINGS(
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720, 1920, /* min/max width */
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480, 1080, /* min/max height */
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27000000, 74250000, /* min/max pixelclock*/
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V4L2_DV_BT_STD_CEA861, /* Supported standards */
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/* capabilities */
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V4L2_DV_BT_CAP_INTERLACED | V4L2_DV_BT_CAP_PROGRESSIVE
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)
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};
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/*
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* Supported SDTV standards. This does the same job as skel_timings_cap, but
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* for standard TV formats.
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*/
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#define SKEL_TVNORMS V4L2_STD_ALL
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/*
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* Interrupt handler: typically interrupts happen after a new frame has been
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* captured. It is the job of the handler to remove the new frame from the
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* internal list and give it back to the vb2 framework, updating the sequence
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* counter and timestamp at the same time.
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*/
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static irqreturn_t skeleton_irq(int irq, void *dev_id)
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{
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#ifdef TODO
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struct skeleton *skel = dev_id;
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/* handle interrupt */
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/* Once a new frame has been captured, mark it as done like this: */
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if (captured_new_frame) {
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...
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spin_lock(&skel->qlock);
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list_del(&new_buf->list);
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spin_unlock(&skel->qlock);
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new_buf->vb.v4l2_buf.sequence = skel->sequence++;
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v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
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vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
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}
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#endif
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return IRQ_HANDLED;
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}
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/*
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* Setup the constraints of the queue: besides setting the number of planes
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* per buffer and the size and allocation context of each plane, it also
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* checks if sufficient buffers have been allocated. Usually 3 is a good
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* minimum number: many DMA engines need a minimum of 2 buffers in the
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* queue and you need to have another available for userspace processing.
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*/
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static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
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unsigned int *nbuffers, unsigned int *nplanes,
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unsigned int sizes[], void *alloc_ctxs[])
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{
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struct skeleton *skel = vb2_get_drv_priv(vq);
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if (vq->num_buffers + *nbuffers < 3)
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*nbuffers = 3 - vq->num_buffers;
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if (fmt && fmt->fmt.pix.sizeimage < skel->format.sizeimage)
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return -EINVAL;
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*nplanes = 1;
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sizes[0] = fmt ? fmt->fmt.pix.sizeimage : skel->format.sizeimage;
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alloc_ctxs[0] = skel->alloc_ctx;
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return 0;
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}
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/*
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* Prepare the buffer for queueing to the DMA engine: check and set the
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* payload size and fill in the field. Note: if the format's field is
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* V4L2_FIELD_ALTERNATE, then vb->v4l2_buf.field should be set in the
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* interrupt handler since that's usually where you know if the TOP or
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* BOTTOM field has been captured.
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*/
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static int buffer_prepare(struct vb2_buffer *vb)
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{
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struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
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unsigned long size = skel->format.sizeimage;
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if (vb2_plane_size(vb, 0) < size) {
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dev_err(&skel->pdev->dev, "buffer too small (%lu < %lu)\n",
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vb2_plane_size(vb, 0), size);
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return -EINVAL;
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}
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vb2_set_plane_payload(vb, 0, size);
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vb->v4l2_buf.field = skel->format.field;
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return 0;
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}
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/*
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* Queue this buffer to the DMA engine.
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*/
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static void buffer_queue(struct vb2_buffer *vb)
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{
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struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue);
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struct skel_buffer *buf = to_skel_buffer(vb);
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unsigned long flags;
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spin_lock_irqsave(&skel->qlock, flags);
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list_add_tail(&buf->list, &skel->buf_list);
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/* TODO: Update any DMA pointers if necessary */
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spin_unlock_irqrestore(&skel->qlock, flags);
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}
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static void return_all_buffers(struct skeleton *skel,
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enum vb2_buffer_state state)
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{
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struct skel_buffer *buf, *node;
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unsigned long flags;
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spin_lock_irqsave(&skel->qlock, flags);
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list_for_each_entry_safe(buf, node, &skel->buf_list, list) {
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vb2_buffer_done(&buf->vb, state);
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list_del(&buf->list);
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}
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spin_unlock_irqrestore(&skel->qlock, flags);
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}
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/*
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* Start streaming. First check if the minimum number of buffers have been
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* queued. If not, then return -ENOBUFS and the vb2 framework will call
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* this function again the next time a buffer has been queued until enough
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* buffers are available to actually start the DMA engine.
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*/
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static int start_streaming(struct vb2_queue *vq, unsigned int count)
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{
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struct skeleton *skel = vb2_get_drv_priv(vq);
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int ret = 0;
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skel->sequence = 0;
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/* TODO: start DMA */
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if (ret) {
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/*
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* In case of an error, return all active buffers to the
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* QUEUED state
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*/
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return_all_buffers(skel, VB2_BUF_STATE_QUEUED);
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}
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return ret;
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}
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/*
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* Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
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* and passed on to the vb2 framework marked as STATE_ERROR.
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*/
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static int stop_streaming(struct vb2_queue *vq)
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{
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struct skeleton *skel = vb2_get_drv_priv(vq);
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/* TODO: stop DMA */
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/* Release all active buffers */
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return_all_buffers(skel, VB2_BUF_STATE_ERROR);
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return 0;
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}
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/*
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* The vb2 queue ops. Note that since q->lock is set we can use the standard
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* vb2_ops_wait_prepare/finish helper functions. If q->lock would be NULL,
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* then this driver would have to provide these ops.
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*/
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static struct vb2_ops skel_qops = {
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.queue_setup = queue_setup,
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.buf_prepare = buffer_prepare,
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.buf_queue = buffer_queue,
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.start_streaming = start_streaming,
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.stop_streaming = stop_streaming,
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.wait_prepare = vb2_ops_wait_prepare,
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.wait_finish = vb2_ops_wait_finish,
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};
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/*
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* Required ioctl querycap. Note that the version field is prefilled with
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* the version of the kernel.
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*/
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static int skeleton_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct skeleton *skel = video_drvdata(file);
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strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
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strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card));
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snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s",
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pci_name(skel->pdev));
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cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
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V4L2_CAP_STREAMING;
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cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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/*
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* Helper function to check and correct struct v4l2_pix_format. It's used
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* not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV
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* standard, HDTV timings or the video input would require updating the
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* current format.
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*/
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static void skeleton_fill_pix_format(struct skeleton *skel,
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struct v4l2_pix_format *pix)
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{
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pix->pixelformat = V4L2_PIX_FMT_YUYV;
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if (skel->input == 0) {
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/* S-Video input */
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pix->width = 720;
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pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576;
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pix->field = V4L2_FIELD_INTERLACED;
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pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
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} else {
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/* HDMI input */
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pix->width = skel->timings.bt.width;
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pix->height = skel->timings.bt.height;
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if (skel->timings.bt.interlaced)
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pix->field = V4L2_FIELD_INTERLACED;
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else
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pix->field = V4L2_FIELD_NONE;
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pix->colorspace = V4L2_COLORSPACE_REC709;
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}
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/*
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* The YUYV format is four bytes for every two pixels, so bytesperline
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* is width * 2.
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*/
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pix->bytesperline = pix->width * 2;
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pix->sizeimage = pix->bytesperline * pix->height;
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pix->priv = 0;
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}
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static int skeleton_try_fmt_vid_cap(struct file *file, void *priv,
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struct v4l2_format *f)
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{
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struct skeleton *skel = video_drvdata(file);
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struct v4l2_pix_format *pix = &f->fmt.pix;
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/*
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* Due to historical reasons providing try_fmt with an unsupported
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* pixelformat will return -EINVAL for video receivers. Webcam drivers,
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* however, will silently correct the pixelformat. Some video capture
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* applications rely on this behavior...
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|
*/
|
||||||
|
if (pix->pixelformat != V4L2_PIX_FMT_YUYV)
|
||||||
|
return -EINVAL;
|
||||||
|
skeleton_fill_pix_format(skel, pix);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_s_fmt_vid_cap(struct file *file, void *priv,
|
||||||
|
struct v4l2_format *f)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
ret = skeleton_try_fmt_vid_cap(file, priv, f);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* It is not allowed to change the format while buffers for use with
|
||||||
|
* streaming have already been allocated.
|
||||||
|
*/
|
||||||
|
if (vb2_is_busy(&skel->queue))
|
||||||
|
return -EBUSY;
|
||||||
|
|
||||||
|
/* TODO: change format */
|
||||||
|
skel->format = f->fmt.pix;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_g_fmt_vid_cap(struct file *file, void *priv,
|
||||||
|
struct v4l2_format *f)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
f->fmt.pix = skel->format;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_enum_fmt_vid_cap(struct file *file, void *priv,
|
||||||
|
struct v4l2_fmtdesc *f)
|
||||||
|
{
|
||||||
|
if (f->index != 0)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
strlcpy(f->description, "4:2:2, packed, YUYV", sizeof(f->description));
|
||||||
|
f->pixelformat = V4L2_PIX_FMT_YUYV;
|
||||||
|
f->flags = 0;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_s_std(struct file *file, void *priv, v4l2_std_id std)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* S_STD is not supported on the HDMI input */
|
||||||
|
if (skel->input)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* No change, so just return. Some applications call S_STD again after
|
||||||
|
* the buffers for streaming have been set up, so we have to allow for
|
||||||
|
* this behavior.
|
||||||
|
*/
|
||||||
|
if (std == skel->std)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Changing the standard implies a format change, which is not allowed
|
||||||
|
* while buffers for use with streaming have already been allocated.
|
||||||
|
*/
|
||||||
|
if (vb2_is_busy(&skel->queue))
|
||||||
|
return -EBUSY;
|
||||||
|
|
||||||
|
/* TODO: handle changing std */
|
||||||
|
|
||||||
|
skel->std = std;
|
||||||
|
|
||||||
|
/* Update the internal format */
|
||||||
|
skeleton_fill_pix_format(skel, &skel->format);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_g_std(struct file *file, void *priv, v4l2_std_id *std)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* G_STD is not supported on the HDMI input */
|
||||||
|
if (skel->input)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
*std = skel->std;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Query the current standard as seen by the hardware. This function shall
|
||||||
|
* never actually change the standard, it just detects and reports.
|
||||||
|
* The framework will initially set *std to tvnorms (i.e. the set of
|
||||||
|
* supported standards by this input), and this function should just AND
|
||||||
|
* this value. If there is no signal, then *std should be set to 0.
|
||||||
|
*/
|
||||||
|
static int skeleton_querystd(struct file *file, void *priv, v4l2_std_id *std)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* QUERY_STD is not supported on the HDMI input */
|
||||||
|
if (skel->input)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
#ifdef TODO
|
||||||
|
/*
|
||||||
|
* Query currently seen standard. Initial value of *std is
|
||||||
|
* V4L2_STD_ALL. This function should look something like this:
|
||||||
|
*/
|
||||||
|
get_signal_info();
|
||||||
|
if (no_signal) {
|
||||||
|
*std = 0;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
/* Use signal information to reduce the number of possible standards */
|
||||||
|
if (signal_has_525_lines)
|
||||||
|
*std &= V4L2_STD_525_60;
|
||||||
|
else
|
||||||
|
*std &= V4L2_STD_625_50;
|
||||||
|
#endif
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_s_dv_timings(struct file *file, void *_fh,
|
||||||
|
struct v4l2_dv_timings *timings)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* S_DV_TIMINGS is not supported on the S-Video input */
|
||||||
|
if (skel->input == 0)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
/* Quick sanity check */
|
||||||
|
if (!v4l2_valid_dv_timings(timings, &skel_timings_cap, NULL, NULL))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
/* Check if the timings are part of the CEA-861 timings. */
|
||||||
|
if (!v4l2_find_dv_timings_cap(timings, &skel_timings_cap,
|
||||||
|
0, NULL, NULL))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
/* Return 0 if the new timings are the same as the current timings. */
|
||||||
|
if (v4l2_match_dv_timings(timings, &skel->timings, 0))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Changing the timings implies a format change, which is not allowed
|
||||||
|
* while buffers for use with streaming have already been allocated.
|
||||||
|
*/
|
||||||
|
if (vb2_is_busy(&skel->queue))
|
||||||
|
return -EBUSY;
|
||||||
|
|
||||||
|
/* TODO: Configure new timings */
|
||||||
|
|
||||||
|
/* Save timings */
|
||||||
|
skel->timings = *timings;
|
||||||
|
|
||||||
|
/* Update the internal format */
|
||||||
|
skeleton_fill_pix_format(skel, &skel->format);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_g_dv_timings(struct file *file, void *_fh,
|
||||||
|
struct v4l2_dv_timings *timings)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* G_DV_TIMINGS is not supported on the S-Video input */
|
||||||
|
if (skel->input == 0)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
*timings = skel->timings;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_enum_dv_timings(struct file *file, void *_fh,
|
||||||
|
struct v4l2_enum_dv_timings *timings)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* ENUM_DV_TIMINGS is not supported on the S-Video input */
|
||||||
|
if (skel->input == 0)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
return v4l2_enum_dv_timings_cap(timings, &skel_timings_cap,
|
||||||
|
NULL, NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Query the current timings as seen by the hardware. This function shall
|
||||||
|
* never actually change the timings, it just detects and reports.
|
||||||
|
* If no signal is detected, then return -ENOLINK. If the hardware cannot
|
||||||
|
* lock to the signal, then return -ENOLCK. If the signal is out of range
|
||||||
|
* of the capabilities of the system (e.g., it is possible that the receiver
|
||||||
|
* can lock but that the DMA engine it is connected to cannot handle
|
||||||
|
* pixelclocks above a certain frequency), then -ERANGE is returned.
|
||||||
|
*/
|
||||||
|
static int skeleton_query_dv_timings(struct file *file, void *_fh,
|
||||||
|
struct v4l2_dv_timings *timings)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* QUERY_DV_TIMINGS is not supported on the S-Video input */
|
||||||
|
if (skel->input == 0)
|
||||||
|
return -ENODATA;
|
||||||
|
|
||||||
|
#ifdef TODO
|
||||||
|
/*
|
||||||
|
* Query currently seen timings. This function should look
|
||||||
|
* something like this:
|
||||||
|
*/
|
||||||
|
detect_timings();
|
||||||
|
if (no_signal)
|
||||||
|
return -ENOLINK;
|
||||||
|
if (cannot_lock_to_signal)
|
||||||
|
return -ENOLCK;
|
||||||
|
if (signal_out_of_range_of_capabilities)
|
||||||
|
return -ERANGE;
|
||||||
|
|
||||||
|
/* Useful for debugging */
|
||||||
|
v4l2_print_dv_timings(skel->v4l2_dev.name, "query_dv_timings:",
|
||||||
|
timings, true);
|
||||||
|
#endif
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_dv_timings_cap(struct file *file, void *fh,
|
||||||
|
struct v4l2_dv_timings_cap *cap)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
/* DV_TIMINGS_CAP is not supported on the S-Video input */
|
||||||
|
if (skel->input == 0)
|
||||||
|
return -ENODATA;
|
||||||
|
*cap = skel_timings_cap;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_enum_input(struct file *file, void *priv,
|
||||||
|
struct v4l2_input *i)
|
||||||
|
{
|
||||||
|
if (i->index > 1)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
i->type = V4L2_INPUT_TYPE_CAMERA;
|
||||||
|
if (i->index == 0) {
|
||||||
|
i->std = SKEL_TVNORMS;
|
||||||
|
strlcpy(i->name, "S-Video", sizeof(i->name));
|
||||||
|
i->capabilities = V4L2_IN_CAP_STD;
|
||||||
|
} else {
|
||||||
|
i->std = 0;
|
||||||
|
strlcpy(i->name, "HDMI", sizeof(i->name));
|
||||||
|
i->capabilities = V4L2_IN_CAP_DV_TIMINGS;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_s_input(struct file *file, void *priv, unsigned int i)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
if (i > 1)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Changing the input implies a format change, which is not allowed
|
||||||
|
* while buffers for use with streaming have already been allocated.
|
||||||
|
*/
|
||||||
|
if (vb2_is_busy(&skel->queue))
|
||||||
|
return -EBUSY;
|
||||||
|
|
||||||
|
skel->input = i;
|
||||||
|
/*
|
||||||
|
* Update tvnorms. The tvnorms value is used by the core to implement
|
||||||
|
* VIDIOC_ENUMSTD so it has to be correct. If tvnorms == 0, then
|
||||||
|
* ENUMSTD will return -ENODATA.
|
||||||
|
*/
|
||||||
|
skel->vdev.tvnorms = i ? 0 : SKEL_TVNORMS;
|
||||||
|
|
||||||
|
/* Update the internal format */
|
||||||
|
skeleton_fill_pix_format(skel, &skel->format);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skeleton_g_input(struct file *file, void *priv, unsigned int *i)
|
||||||
|
{
|
||||||
|
struct skeleton *skel = video_drvdata(file);
|
||||||
|
|
||||||
|
*i = skel->input;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* The control handler. */
|
||||||
|
static int skeleton_s_ctrl(struct v4l2_ctrl *ctrl)
|
||||||
|
{
|
||||||
|
/*struct skeleton *skel =
|
||||||
|
container_of(ctrl->handler, struct skeleton, ctrl_handler);*/
|
||||||
|
|
||||||
|
switch (ctrl->id) {
|
||||||
|
case V4L2_CID_BRIGHTNESS:
|
||||||
|
/* TODO: set brightness to ctrl->val */
|
||||||
|
break;
|
||||||
|
case V4L2_CID_CONTRAST:
|
||||||
|
/* TODO: set contrast to ctrl->val */
|
||||||
|
break;
|
||||||
|
case V4L2_CID_SATURATION:
|
||||||
|
/* TODO: set saturation to ctrl->val */
|
||||||
|
break;
|
||||||
|
case V4L2_CID_HUE:
|
||||||
|
/* TODO: set hue to ctrl->val */
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* ------------------------------------------------------------------
|
||||||
|
File operations for the device
|
||||||
|
------------------------------------------------------------------*/
|
||||||
|
|
||||||
|
static const struct v4l2_ctrl_ops skel_ctrl_ops = {
|
||||||
|
.s_ctrl = skeleton_s_ctrl,
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The set of all supported ioctls. Note that all the streaming ioctls
|
||||||
|
* use the vb2 helper functions that take care of all the locking and
|
||||||
|
* that also do ownership tracking (i.e. only the filehandle that requested
|
||||||
|
* the buffers can call the streaming ioctls, all other filehandles will
|
||||||
|
* receive -EBUSY if they attempt to call the same streaming ioctls).
|
||||||
|
*
|
||||||
|
* The last three ioctls also use standard helper functions: these implement
|
||||||
|
* standard behavior for drivers with controls.
|
||||||
|
*/
|
||||||
|
static const struct v4l2_ioctl_ops skel_ioctl_ops = {
|
||||||
|
.vidioc_querycap = skeleton_querycap,
|
||||||
|
.vidioc_try_fmt_vid_cap = skeleton_try_fmt_vid_cap,
|
||||||
|
.vidioc_s_fmt_vid_cap = skeleton_s_fmt_vid_cap,
|
||||||
|
.vidioc_g_fmt_vid_cap = skeleton_g_fmt_vid_cap,
|
||||||
|
.vidioc_enum_fmt_vid_cap = skeleton_enum_fmt_vid_cap,
|
||||||
|
|
||||||
|
.vidioc_g_std = skeleton_g_std,
|
||||||
|
.vidioc_s_std = skeleton_s_std,
|
||||||
|
.vidioc_querystd = skeleton_querystd,
|
||||||
|
|
||||||
|
.vidioc_s_dv_timings = skeleton_s_dv_timings,
|
||||||
|
.vidioc_g_dv_timings = skeleton_g_dv_timings,
|
||||||
|
.vidioc_enum_dv_timings = skeleton_enum_dv_timings,
|
||||||
|
.vidioc_query_dv_timings = skeleton_query_dv_timings,
|
||||||
|
.vidioc_dv_timings_cap = skeleton_dv_timings_cap,
|
||||||
|
|
||||||
|
.vidioc_enum_input = skeleton_enum_input,
|
||||||
|
.vidioc_g_input = skeleton_g_input,
|
||||||
|
.vidioc_s_input = skeleton_s_input,
|
||||||
|
|
||||||
|
.vidioc_reqbufs = vb2_ioctl_reqbufs,
|
||||||
|
.vidioc_create_bufs = vb2_ioctl_create_bufs,
|
||||||
|
.vidioc_querybuf = vb2_ioctl_querybuf,
|
||||||
|
.vidioc_qbuf = vb2_ioctl_qbuf,
|
||||||
|
.vidioc_dqbuf = vb2_ioctl_dqbuf,
|
||||||
|
.vidioc_expbuf = vb2_ioctl_expbuf,
|
||||||
|
.vidioc_streamon = vb2_ioctl_streamon,
|
||||||
|
.vidioc_streamoff = vb2_ioctl_streamoff,
|
||||||
|
|
||||||
|
.vidioc_log_status = v4l2_ctrl_log_status,
|
||||||
|
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
|
||||||
|
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The set of file operations. Note that all these ops are standard core
|
||||||
|
* helper functions.
|
||||||
|
*/
|
||||||
|
static const struct v4l2_file_operations skel_fops = {
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.open = v4l2_fh_open,
|
||||||
|
.release = vb2_fop_release,
|
||||||
|
.unlocked_ioctl = video_ioctl2,
|
||||||
|
.read = vb2_fop_read,
|
||||||
|
.mmap = vb2_fop_mmap,
|
||||||
|
.poll = vb2_fop_poll,
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The initial setup of this device instance. Note that the initial state of
|
||||||
|
* the driver should be complete. So the initial format, standard, timings
|
||||||
|
* and video input should all be initialized to some reasonable value.
|
||||||
|
*/
|
||||||
|
static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
|
||||||
|
{
|
||||||
|
/* The initial timings are chosen to be 720p60. */
|
||||||
|
static const struct v4l2_dv_timings timings_def =
|
||||||
|
V4L2_DV_BT_CEA_1280X720P60;
|
||||||
|
struct skeleton *skel;
|
||||||
|
struct video_device *vdev;
|
||||||
|
struct v4l2_ctrl_handler *hdl;
|
||||||
|
struct vb2_queue *q;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
/* Enable PCI */
|
||||||
|
ret = pci_enable_device(pdev);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
|
||||||
|
if (ret) {
|
||||||
|
dev_err(&pdev->dev, "no suitable DMA available.\n");
|
||||||
|
goto disable_pci;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Allocate a new instance */
|
||||||
|
skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL);
|
||||||
|
if (!skel)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
/* Allocate the interrupt */
|
||||||
|
ret = devm_request_irq(&pdev->dev, pdev->irq,
|
||||||
|
skeleton_irq, 0, KBUILD_MODNAME, skel);
|
||||||
|
if (ret) {
|
||||||
|
dev_err(&pdev->dev, "request_irq failed\n");
|
||||||
|
goto disable_pci;
|
||||||
|
}
|
||||||
|
skel->pdev = pdev;
|
||||||
|
|
||||||
|
/* Fill in the initial format-related settings */
|
||||||
|
skel->timings = timings_def;
|
||||||
|
skel->std = V4L2_STD_625_50;
|
||||||
|
skeleton_fill_pix_format(skel, &skel->format);
|
||||||
|
|
||||||
|
/* Initialize the top-level structure */
|
||||||
|
ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev);
|
||||||
|
if (ret)
|
||||||
|
goto disable_pci;
|
||||||
|
|
||||||
|
mutex_init(&skel->lock);
|
||||||
|
|
||||||
|
/* Add the controls */
|
||||||
|
hdl = &skel->ctrl_handler;
|
||||||
|
v4l2_ctrl_handler_init(hdl, 4);
|
||||||
|
v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
|
||||||
|
V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
|
||||||
|
v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
|
||||||
|
V4L2_CID_CONTRAST, 0, 255, 1, 16);
|
||||||
|
v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
|
||||||
|
V4L2_CID_SATURATION, 0, 255, 1, 127);
|
||||||
|
v4l2_ctrl_new_std(hdl, &skel_ctrl_ops,
|
||||||
|
V4L2_CID_HUE, -128, 127, 1, 0);
|
||||||
|
if (hdl->error) {
|
||||||
|
ret = hdl->error;
|
||||||
|
goto free_hdl;
|
||||||
|
}
|
||||||
|
skel->v4l2_dev.ctrl_handler = hdl;
|
||||||
|
|
||||||
|
/* Initialize the vb2 queue */
|
||||||
|
q = &skel->queue;
|
||||||
|
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
||||||
|
q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
|
||||||
|
q->drv_priv = skel;
|
||||||
|
q->buf_struct_size = sizeof(struct skel_buffer);
|
||||||
|
q->ops = &skel_qops;
|
||||||
|
q->mem_ops = &vb2_dma_contig_memops;
|
||||||
|
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
|
||||||
|
/*
|
||||||
|
* Assume that this DMA engine needs to have at least two buffers
|
||||||
|
* available before it can be started. The start_streaming() op
|
||||||
|
* won't be called until at least this many buffers are queued up.
|
||||||
|
*/
|
||||||
|
q->min_buffers_needed = 2;
|
||||||
|
/*
|
||||||
|
* The serialization lock for the streaming ioctls. This is the same
|
||||||
|
* as the main serialization lock, but if some of the non-streaming
|
||||||
|
* ioctls could take a long time to execute, then you might want to
|
||||||
|
* have a different lock here to prevent VIDIOC_DQBUF from being
|
||||||
|
* blocked while waiting for another action to finish. This is
|
||||||
|
* generally not needed for PCI devices, but USB devices usually do
|
||||||
|
* want a separate lock here.
|
||||||
|
*/
|
||||||
|
q->lock = &skel->lock;
|
||||||
|
/*
|
||||||
|
* Since this driver can only do 32-bit DMA we must make sure that
|
||||||
|
* the vb2 core will allocate the buffers in 32-bit DMA memory.
|
||||||
|
*/
|
||||||
|
q->gfp_flags = GFP_DMA32;
|
||||||
|
ret = vb2_queue_init(q);
|
||||||
|
if (ret)
|
||||||
|
goto free_hdl;
|
||||||
|
|
||||||
|
skel->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
|
||||||
|
if (IS_ERR(skel->alloc_ctx)) {
|
||||||
|
dev_err(&pdev->dev, "Can't allocate buffer context");
|
||||||
|
ret = PTR_ERR(skel->alloc_ctx);
|
||||||
|
goto free_hdl;
|
||||||
|
}
|
||||||
|
INIT_LIST_HEAD(&skel->buf_list);
|
||||||
|
spin_lock_init(&skel->qlock);
|
||||||
|
|
||||||
|
/* Initialize the video_device structure */
|
||||||
|
vdev = &skel->vdev;
|
||||||
|
strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
|
||||||
|
/*
|
||||||
|
* There is nothing to clean up, so release is set to an empty release
|
||||||
|
* function. The release callback must be non-NULL.
|
||||||
|
*/
|
||||||
|
vdev->release = video_device_release_empty;
|
||||||
|
vdev->fops = &skel_fops,
|
||||||
|
vdev->ioctl_ops = &skel_ioctl_ops,
|
||||||
|
/*
|
||||||
|
* The main serialization lock. All ioctls are serialized by this
|
||||||
|
* lock. Exception: if q->lock is set, then the streaming ioctls
|
||||||
|
* are serialized by that separate lock.
|
||||||
|
*/
|
||||||
|
vdev->lock = &skel->lock;
|
||||||
|
vdev->queue = q;
|
||||||
|
vdev->v4l2_dev = &skel->v4l2_dev;
|
||||||
|
/* Supported SDTV standards, if any */
|
||||||
|
vdev->tvnorms = SKEL_TVNORMS;
|
||||||
|
/* If this bit is set, then the v4l2 core will provide the support
|
||||||
|
* for the VIDIOC_G/S_PRIORITY ioctls. This flag will eventually
|
||||||
|
* go away once all drivers have been converted to use struct v4l2_fh.
|
||||||
|
*/
|
||||||
|
set_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags);
|
||||||
|
video_set_drvdata(vdev, skel);
|
||||||
|
|
||||||
|
ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
|
||||||
|
if (ret)
|
||||||
|
goto free_ctx;
|
||||||
|
|
||||||
|
dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n");
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
free_ctx:
|
||||||
|
vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
|
||||||
|
free_hdl:
|
||||||
|
v4l2_ctrl_handler_free(&skel->ctrl_handler);
|
||||||
|
v4l2_device_unregister(&skel->v4l2_dev);
|
||||||
|
disable_pci:
|
||||||
|
pci_disable_device(pdev);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void skeleton_remove(struct pci_dev *pdev)
|
||||||
|
{
|
||||||
|
struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
|
||||||
|
struct skeleton *skel = container_of(v4l2_dev, struct skeleton, v4l2_dev);
|
||||||
|
|
||||||
|
video_unregister_device(&skel->vdev);
|
||||||
|
v4l2_ctrl_handler_free(&skel->ctrl_handler);
|
||||||
|
vb2_dma_contig_cleanup_ctx(skel->alloc_ctx);
|
||||||
|
v4l2_device_unregister(&skel->v4l2_dev);
|
||||||
|
pci_disable_device(skel->pdev);
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct pci_driver skeleton_driver = {
|
||||||
|
.name = KBUILD_MODNAME,
|
||||||
|
.probe = skeleton_probe,
|
||||||
|
.remove = skeleton_remove,
|
||||||
|
.id_table = skeleton_pci_tbl,
|
||||||
|
};
|
||||||
|
|
||||||
|
module_pci_driver(skeleton_driver);
|
||||||
Loading…
Reference in New Issue