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*参照元 [#gf7bd568] #backlinks *説明 [#h68659ff] -パス: [[linux-4.4.1/Documentation/video4linux/v4l2-pci-skeleton.c]] -FIXME: これは何？ --説明 **引数 [#hf421675] -struct pci_dev *pdev -- --[[linux-4.4.1/pci_dev]] -const struct pci_device_id *ent -- --[[linux-4.4.1/pci_device_id]] **返り値 [#j9a77352] -int -- **参考 [#h306515e] *実装 [#lab6d678] /* * 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; - --[[linux-4.4.1/v4l2_dv_timings]] --[[linux-4.4.1/skeleton]] --[[linux-4.4.1/video_device]] --[[linux-4.4.1/v4l2_ctrl_handler]] --[[linux-4.4.1/vb2_queue]] /* 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; } - --[[linux-4.4.1/pci_enable_device()]] --[[linux-4.4.1/pci_set_dma_mask()]] --[[linux-4.4.1/DMA_BIT_MASK()]] --[[linux-4.4.1/dev_err()]] /* Allocate a new instance */ skel = devm_kzalloc(&pdev->dev, sizeof(struct skeleton), GFP_KERNEL); if (!skel) return -ENOMEM; - --[[linux-4.4.1/devm_kzalloc()]] /* 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; - --[[linux-4.4.1/devm_request_irq()]] --[[linux-4.4.1/skeleton_irq()]] /* Fill in the initial format-related settings */ skel->timings = timings_def; skel->std = V4L2_STD_625_50; skeleton_fill_pix_format(skel, &skel->format); - --[[linux-4.4.1/skeleton_fill_pix_format()]] /* Initialize the top-level structure */ ret = v4l2_device_register(&pdev->dev, &skel->v4l2_dev); if (ret) goto disable_pci; - --[[linux-4.4.1/v4l2_device_register()]] mutex_init(&skel->lock); - --[[linux-4.4.1/mutex_init()]] /* 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; - --[[linux-4.4.1/v4l2_ctrl_handler_init()]] --[[linux-4.4.1/v4l2_ctrl_new_std()]] --[[linux-4.4.1/skel_ctrl_ops(global)]] /* 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; - --[[linux-4.4.1/skel_qops(global)]] --[[linux-4.4.1/vb2_dma_contig_memops(global)]] /* * 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; - --[[linux-4.4.1/vb2_queue_init()]] 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); - --[[linux-4.4.1/vb2_dma_contig_init_ctx()]] --[[linux-4.4.1/IS_ERR()]] --[[linux-4.4.1/dev_err()]] --[[linux-4.4.1/PTR_ERR()]] --[[linux-4.4.1/INIT_LIST_HEAD()]] --[[linux-4.4.1/spin_lock_init()]] /* Initialize the video_device structure */ vdev = &skel->vdev; strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name)); - --[[linux-4.4.1/strlcpy()]] /* * 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, - --[[linux-4.4.1/video_device_release_empty()]] --[[linux-4.4.1/skel_fops(global)]] --[[linux-4.4.1/skel_ioctl_ops(global)]] /* * 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; video_set_drvdata(vdev, skel); - --[[linux-4.4.1/video_set_drvdata()]] ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1); if (ret) goto free_ctx; - --[[linux-4.4.1/video_register_device()]] dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n"); return 0; - --[[linux-4.4.1/dev_info()]] free_ctx: vb2_dma_contig_cleanup_ctx(skel->alloc_ctx); - --[[linux-4.4.1/vb2_dma_contig_cleanup_ctx()]] free_hdl: v4l2_ctrl_handler_free(&skel->ctrl_handler); v4l2_device_unregister(&skel->v4l2_dev); - --[[linux-4.4.1/v4l2_ctrl_handler_free()]] --[[linux-4.4.1/v4l2_device_unregister()]] disable_pci: pci_disable_device(pdev); - --[[linux-4.4.1/pci_disable_device()]] return ret; } *コメント [#s051519a]
