| /* |
| * This is a V4L2 PCI Skeleton Driver. It gives an initial skeleton source |
| * for use with other PCI drivers. |
| * |
| * This skeleton PCI driver assumes that the card has an S-Video connector as |
| * input 0 and an HDMI connector as input 1. |
| * |
| * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
| * |
| * This program is free software; you may redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kmod.h> |
| #include <linux/mutex.h> |
| #include <linux/pci.h> |
| #include <linux/interrupt.h> |
| #include <linux/videodev2.h> |
| #include <linux/v4l2-dv-timings.h> |
| #include <media/v4l2-device.h> |
| #include <media/v4l2-dev.h> |
| #include <media/v4l2-ioctl.h> |
| #include <media/v4l2-dv-timings.h> |
| #include <media/v4l2-ctrls.h> |
| #include <media/v4l2-event.h> |
| #include <media/videobuf2-v4l2.h> |
| #include <media/videobuf2-dma-contig.h> |
| |
| MODULE_DESCRIPTION("V4L2 PCI Skeleton Driver"); |
| MODULE_AUTHOR("Hans Verkuil"); |
| MODULE_LICENSE("GPL v2"); |
| |
| /** |
| * struct skeleton - All internal data for one instance of device |
| * @pdev: PCI device |
| * @v4l2_dev: top-level v4l2 device struct |
| * @vdev: video node structure |
| * @ctrl_handler: control handler structure |
| * @lock: ioctl serialization mutex |
| * @std: current SDTV standard |
| * @timings: current HDTV timings |
| * @format: current pix format |
| * @input: current video input (0 = SDTV, 1 = HDTV) |
| * @queue: vb2 video capture queue |
| * @qlock: spinlock controlling access to buf_list and sequence |
| * @buf_list: list of buffers queued for DMA |
| * @field: the field (TOP/BOTTOM/other) of the current buffer |
| * @sequence: frame sequence counter |
| */ |
| struct skeleton { |
| struct pci_dev *pdev; |
| struct v4l2_device v4l2_dev; |
| struct video_device vdev; |
| struct v4l2_ctrl_handler ctrl_handler; |
| struct mutex lock; |
| v4l2_std_id std; |
| struct v4l2_dv_timings timings; |
| struct v4l2_pix_format format; |
| unsigned input; |
| |
| struct vb2_queue queue; |
| |
| spinlock_t qlock; |
| struct list_head buf_list; |
| unsigned field; |
| unsigned sequence; |
| }; |
| |
| struct skel_buffer { |
| struct vb2_v4l2_buffer vb; |
| struct list_head list; |
| }; |
| |
| static inline struct skel_buffer *to_skel_buffer(struct vb2_v4l2_buffer *vbuf) |
| { |
| return container_of(vbuf, struct skel_buffer, vb); |
| } |
| |
| static const struct pci_device_id skeleton_pci_tbl[] = { |
| /* { PCI_DEVICE(PCI_VENDOR_ID_, PCI_DEVICE_ID_) }, */ |
| { 0, } |
| }; |
| MODULE_DEVICE_TABLE(pci, skeleton_pci_tbl); |
| |
| /* |
| * HDTV: this structure has the capabilities of the HDTV receiver. |
| * It is used to constrain the huge list of possible formats based |
| * upon the hardware capabilities. |
| */ |
| static const struct v4l2_dv_timings_cap skel_timings_cap = { |
| .type = V4L2_DV_BT_656_1120, |
| /* keep this initialization for compatibility with GCC < 4.4.6 */ |
| .reserved = { 0 }, |
| V4L2_INIT_BT_TIMINGS( |
| 720, 1920, /* min/max width */ |
| 480, 1080, /* min/max height */ |
| 27000000, 74250000, /* min/max pixelclock*/ |
| V4L2_DV_BT_STD_CEA861, /* Supported standards */ |
| /* capabilities */ |
| V4L2_DV_BT_CAP_INTERLACED | V4L2_DV_BT_CAP_PROGRESSIVE |
| ) |
| }; |
| |
| /* |
| * Supported SDTV standards. This does the same job as skel_timings_cap, but |
| * for standard TV formats. |
| */ |
| #define SKEL_TVNORMS V4L2_STD_ALL |
| |
| /* |
| * Interrupt handler: typically interrupts happen after a new frame has been |
| * captured. It is the job of the handler to remove the new frame from the |
| * internal list and give it back to the vb2 framework, updating the sequence |
| * counter, field and timestamp at the same time. |
| */ |
| static irqreturn_t skeleton_irq(int irq, void *dev_id) |
| { |
| #ifdef TODO |
| struct skeleton *skel = dev_id; |
| |
| /* handle interrupt */ |
| |
| /* Once a new frame has been captured, mark it as done like this: */ |
| if (captured_new_frame) { |
| ... |
| spin_lock(&skel->qlock); |
| list_del(&new_buf->list); |
| spin_unlock(&skel->qlock); |
| new_buf->vb.vb2_buf.timestamp = ktime_get_ns(); |
| new_buf->vb.sequence = skel->sequence++; |
| new_buf->vb.field = skel->field; |
| if (skel->format.field == V4L2_FIELD_ALTERNATE) { |
| if (skel->field == V4L2_FIELD_BOTTOM) |
| skel->field = V4L2_FIELD_TOP; |
| else if (skel->field == V4L2_FIELD_TOP) |
| skel->field = V4L2_FIELD_BOTTOM; |
| } |
| vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE); |
| } |
| #endif |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Setup the constraints of the queue: besides setting the number of planes |
| * per buffer and the size and allocation context of each plane, it also |
| * checks if sufficient buffers have been allocated. Usually 3 is a good |
| * minimum number: many DMA engines need a minimum of 2 buffers in the |
| * queue and you need to have another available for userspace processing. |
| */ |
| static int queue_setup(struct vb2_queue *vq, |
| unsigned int *nbuffers, unsigned int *nplanes, |
| unsigned int sizes[], struct device *alloc_devs[]) |
| { |
| struct skeleton *skel = vb2_get_drv_priv(vq); |
| |
| skel->field = skel->format.field; |
| if (skel->field == V4L2_FIELD_ALTERNATE) { |
| /* |
| * You cannot use read() with FIELD_ALTERNATE since the field |
| * information (TOP/BOTTOM) cannot be passed back to the user. |
| */ |
| if (vb2_fileio_is_active(vq)) |
| return -EINVAL; |
| skel->field = V4L2_FIELD_TOP; |
| } |
| |
| if (vq->num_buffers + *nbuffers < 3) |
| *nbuffers = 3 - vq->num_buffers; |
| |
| if (*nplanes) |
| return sizes[0] < skel->format.sizeimage ? -EINVAL : 0; |
| *nplanes = 1; |
| sizes[0] = skel->format.sizeimage; |
| return 0; |
| } |
| |
| /* |
| * Prepare the buffer for queueing to the DMA engine: check and set the |
| * payload size. |
| */ |
| static int buffer_prepare(struct vb2_buffer *vb) |
| { |
| struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue); |
| unsigned long size = skel->format.sizeimage; |
| |
| if (vb2_plane_size(vb, 0) < size) { |
| dev_err(&skel->pdev->dev, "buffer too small (%lu < %lu)\n", |
| vb2_plane_size(vb, 0), size); |
| return -EINVAL; |
| } |
| |
| vb2_set_plane_payload(vb, 0, size); |
| return 0; |
| } |
| |
| /* |
| * Queue this buffer to the DMA engine. |
| */ |
| static void buffer_queue(struct vb2_buffer *vb) |
| { |
| struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
| struct skeleton *skel = vb2_get_drv_priv(vb->vb2_queue); |
| struct skel_buffer *buf = to_skel_buffer(vbuf); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&skel->qlock, flags); |
| list_add_tail(&buf->list, &skel->buf_list); |
| |
| /* TODO: Update any DMA pointers if necessary */ |
| |
| spin_unlock_irqrestore(&skel->qlock, flags); |
| } |
| |
| static void return_all_buffers(struct skeleton *skel, |
| enum vb2_buffer_state state) |
| { |
| struct skel_buffer *buf, *node; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&skel->qlock, flags); |
| list_for_each_entry_safe(buf, node, &skel->buf_list, list) { |
| vb2_buffer_done(&buf->vb.vb2_buf, state); |
| list_del(&buf->list); |
| } |
| spin_unlock_irqrestore(&skel->qlock, flags); |
| } |
| |
| /* |
| * Start streaming. First check if the minimum number of buffers have been |
| * queued. If not, then return -ENOBUFS and the vb2 framework will call |
| * this function again the next time a buffer has been queued until enough |
| * buffers are available to actually start the DMA engine. |
| */ |
| static int start_streaming(struct vb2_queue *vq, unsigned int count) |
| { |
| struct skeleton *skel = vb2_get_drv_priv(vq); |
| int ret = 0; |
| |
| skel->sequence = 0; |
| |
| /* TODO: start DMA */ |
| |
| if (ret) { |
| /* |
| * In case of an error, return all active buffers to the |
| * QUEUED state |
| */ |
| return_all_buffers(skel, VB2_BUF_STATE_QUEUED); |
| } |
| return ret; |
| } |
| |
| /* |
| * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued |
| * and passed on to the vb2 framework marked as STATE_ERROR. |
| */ |
| static void stop_streaming(struct vb2_queue *vq) |
| { |
| struct skeleton *skel = vb2_get_drv_priv(vq); |
| |
| /* TODO: stop DMA */ |
| |
| /* Release all active buffers */ |
| return_all_buffers(skel, VB2_BUF_STATE_ERROR); |
| } |
| |
| /* |
| * The vb2 queue ops. Note that since q->lock is set we can use the standard |
| * vb2_ops_wait_prepare/finish helper functions. If q->lock would be NULL, |
| * then this driver would have to provide these ops. |
| */ |
| static const struct vb2_ops skel_qops = { |
| .queue_setup = queue_setup, |
| .buf_prepare = buffer_prepare, |
| .buf_queue = buffer_queue, |
| .start_streaming = start_streaming, |
| .stop_streaming = stop_streaming, |
| .wait_prepare = vb2_ops_wait_prepare, |
| .wait_finish = vb2_ops_wait_finish, |
| }; |
| |
| /* |
| * Required ioctl querycap. Note that the version field is prefilled with |
| * the version of the kernel. |
| */ |
| static int skeleton_querycap(struct file *file, void *priv, |
| struct v4l2_capability *cap) |
| { |
| struct skeleton *skel = video_drvdata(file); |
| |
| strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver)); |
| strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card)); |
| snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s", |
| pci_name(skel->pdev)); |
| return 0; |
| } |
| |
| /* |
| * Helper function to check and correct struct v4l2_pix_format. It's used |
| * not only in VIDIOC_TRY/S_FMT, but also elsewhere if changes to the SDTV |
| * standard, HDTV timings or the video input would require updating the |
| * current format. |
| */ |
| static void skeleton_fill_pix_format(struct skeleton *skel, |
| struct v4l2_pix_format *pix) |
| { |
| pix->pixelformat = V4L2_PIX_FMT_YUYV; |
| if (skel->input == 0) { |
| /* S-Video input */ |
| pix->width = 720; |
| pix->height = (skel->std & V4L2_STD_525_60) ? 480 : 576; |
| pix->field = V4L2_FIELD_INTERLACED; |
| pix->colorspace = V4L2_COLORSPACE_SMPTE170M; |
| } else { |
| /* HDMI input */ |
| pix->width = skel->timings.bt.width; |
| pix->height = skel->timings.bt.height; |
| if (skel->timings.bt.interlaced) { |
| pix->field = V4L2_FIELD_ALTERNATE; |
| pix->height /= 2; |
| } else { |
| pix->field = V4L2_FIELD_NONE; |
| } |
| pix->colorspace = V4L2_COLORSPACE_REC709; |
| } |
| |
| /* |
| * The YUYV format is four bytes for every two pixels, so bytesperline |
| * is width * 2. |
| */ |
| pix->bytesperline = pix->width * 2; |
| pix->sizeimage = pix->bytesperline * pix->height; |
| pix->priv = 0; |
| } |
| |
| static int skeleton_try_fmt_vid_cap(struct file *file, void *priv, |
| struct v4l2_format *f) |
| { |
| struct skeleton *skel = video_drvdata(file); |
| struct v4l2_pix_format *pix = &f->fmt.pix; |
| |
| /* |
| * Due to historical reasons providing try_fmt with an unsupported |
| * pixelformat will return -EINVAL for video receivers. Webcam drivers, |
| * however, will silently correct the pixelformat. Some video capture |
| * applications rely on this behavior... |
| */ |
| 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; |
| |
| f->pixelformat = V4L2_PIX_FMT_YUYV; |
| 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, false)) |
| 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) { |
| ret = -ENOMEM; |
| goto disable_pci; |
| } |
| |
| /* 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->dev = &pdev->dev; |
| 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; |
| |
| 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, |
| vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE | |
| V4L2_CAP_STREAMING; |
| /* |
| * 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); |
| |
| ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1); |
| if (ret) |
| goto free_hdl; |
| |
| dev_info(&pdev->dev, "V4L2 PCI Skeleton Driver loaded\n"); |
| return 0; |
| |
| 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); |
| 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); |