Hi Niklas,
Thanks for the patch. I've been testing this a bit more and there are a
few things missing.
On 04/12/2016 04:33 PM, Niklas Söderlund wrote:
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> new file mode 100644
> index 0000000..a752171
> --- /dev/null
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -0,0 +1,732 @@
> +/*
> + * Driver for Renesas R-Car VIN
> + *
> + * Copyright (C) 2016 Renesas Electronics Corp.
> + * Copyright (C) 2011-2013 Renesas Solutions Corp.
> + * Copyright (C) 2013 Cogent Embedded, Inc., <source@xxxxxxxxxxxxxxxxxx>
> + * Copyright (C) 2008 Magnus Damm
> + *
> + * Based on the soc-camera rcar_vin driver
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/pm_runtime.h>
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +
> +#include "rcar-vin.h"
> +
> +#define RVIN_DEFAULT_FORMAT V4L2_PIX_FMT_YUYV
> +#define RVIN_MAX_WIDTH 2048
> +#define RVIN_MAX_HEIGHT 2048
> +
> +/* -----------------------------------------------------------------------------
> + * Format Conversions
> + */
> +
> +static const struct rvin_video_format rvin_formats[] = {
> + {
> + .fourcc = V4L2_PIX_FMT_NV16,
> + .bpp = 1,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUYV,
> + .bpp = 2,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_UYVY,
> + .bpp = 2,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_RGB565,
> + .bpp = 2,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_XRGB555,
> + .bpp = 2,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_XBGR32,
> + .bpp = 4,
> + },
> +};
> +
> +const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(rvin_formats); i++)
> + if (rvin_formats[i].fourcc == pixelformat)
> + return rvin_formats + i;
> +
> + return NULL;
> +}
> +
> +static u32 rvin_format_bytesperline(struct v4l2_pix_format *pix)
> +{
> + const struct rvin_video_format *fmt;
> +
> + fmt = rvin_format_from_pixel(pix->pixelformat);
> +
> + if (WARN_ON(!fmt))
> + return -EINVAL;
> +
> + return pix->width * fmt->bpp;
> +}
> +
> +static u32 rvin_format_sizeimage(struct v4l2_pix_format *pix)
> +{
> + if (pix->pixelformat == V4L2_PIX_FMT_NV16)
> + return pix->bytesperline * pix->height * 2;
> +
> + return pix->bytesperline * pix->height;
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * V4L2
> + */
> +
> +static int __rvin_try_format_sensor(struct rvin_dev *vin,
> + u32 which,
> + struct v4l2_pix_format *pix,
> + struct rvin_sensor *sensor)
> +{
> + struct v4l2_subdev *sd;
> + struct v4l2_subdev_pad_config pad_cfg;
> + struct v4l2_subdev_format format = {
> + .which = which,
> + };
> + int ret;
> +
> + sd = vin_to_sd(vin);
> +
> + v4l2_fill_mbus_format(&format.format, pix, vin->sensor.code);
> +
> + ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, pad, set_fmt,
> + &pad_cfg, &format);
> + if (ret < 0)
> + return ret;
> +
> + v4l2_fill_pix_format(pix, &format.format);
> +
> + sensor->width = pix->width;
> + sensor->height = pix->height;
> +
> + vin_dbg(vin, "Sensor format: %ux%u\n", sensor->width, sensor->height);
> +
> + return 0;
> +}
> +
> +static int __rvin_try_format(struct rvin_dev *vin,
> + u32 which,
> + struct v4l2_pix_format *pix,
> + struct rvin_sensor *sensor)
> +{
> + const struct rvin_video_format *info;
> + u32 rwidth, rheight, walign;
> +
> + /* Requested */
> + rwidth = pix->width;
> + rheight = pix->height;
> +
> + /*
> + * Retrieve format information and select the current format if the
> + * requested format isn't supported.
> + */
> + info = rvin_format_from_pixel(pix->pixelformat);
> + if (!info) {
> + vin_dbg(vin, "Format %x not found, keeping %x\n",
> + pix->pixelformat, vin->format.pixelformat);
> + *pix = vin->format;
> + pix->width = rwidth;
> + pix->height = rheight;
> + }
> +
> + /* Always recalculate */
> + pix->bytesperline = 0;
> + pix->sizeimage = 0;
> +
> + /* Limit to sensor capabilities */
> + __rvin_try_format_sensor(vin, which, pix, sensor);
> +
> + /* If sensor can't match format try if VIN can scale */
> + if (sensor->width != rwidth || sensor->height != rheight)
> + rvin_scale_try(vin, pix, rwidth, rheight);
> +
> + /* HW limit width to a multiple of 32 (2^5) for NV16 else 2 (2^1) */
> + walign = vin->format.pixelformat == V4L2_PIX_FMT_NV16 ? 5 : 1;
> +
> + /* Limit to VIN capabilities */
> + v4l_bound_align_image(&pix->width, 2, RVIN_MAX_WIDTH, walign,
> + &pix->height, 4, RVIN_MAX_HEIGHT, 2, 0);
> +
> + switch (pix->field) {
> + case V4L2_FIELD_NONE:
> + case V4L2_FIELD_TOP:
> + case V4L2_FIELD_BOTTOM:
> + case V4L2_FIELD_INTERLACED_TB:
> + case V4L2_FIELD_INTERLACED_BT:
> + case V4L2_FIELD_INTERLACED:
> + break;
> + default:
> + pix->field = V4L2_FIELD_NONE;
> + break;
> + }
> +
> + pix->bytesperline = max_t(u32, pix->bytesperline,
> + rvin_format_bytesperline(pix));
> + pix->sizeimage = max_t(u32, pix->sizeimage,
> + rvin_format_sizeimage(pix));
> +
> + vin_dbg(vin, "Requested %ux%u Got %ux%u bpl: %d size: %d\n",
> + rwidth, rheight, pix->width, pix->height,
> + pix->bytesperline, pix->sizeimage);
> +
> + return 0;
> +}
> +
> +static int rvin_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> +
> + strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
> + strlcpy(cap->card, "R_Car_VIN", sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + dev_name(vin->dev));
> + cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
> + V4L2_CAP_READWRITE;
> + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
In the very latest master branch support was added for a device_caps field in
struct video_device. It is recommended to fill in the device caps there when the
video_device struct is initialized. You can then drop initializing the device_caps
and capabilities here since the core will initialize them for you.
The advantage of this is that the core now knows the capabilities of the device.
> + return 0;
> +}
> +
> +static int rvin_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct rvin_sensor sensor;
> +
> + return __rvin_try_format(vin, V4L2_SUBDEV_FORMAT_TRY, &f->fmt.pix,
> + &sensor);
> +}
> +
> +static int rvin_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct rvin_sensor sensor;
> + int ret;
> +
> + if (vb2_is_busy(&vin->queue))
> + return -EBUSY;
> +
> + ret = __rvin_try_format(vin, V4L2_SUBDEV_FORMAT_ACTIVE, &f->fmt.pix,
> + &sensor);
> + if (ret)
> + return ret;
> +
> + vin->sensor.width = sensor.width;
> + vin->sensor.height = sensor.height;
> +
> + vin->format = f->fmt.pix;
> +
> + return 0;
> +}
> +
> +static int rvin_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> +
> + f->fmt.pix = vin->format;
> +
> + return 0;
> +}
> +
> +static int rvin_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + if (f->index >= ARRAY_SIZE(rvin_formats))
> + return -EINVAL;
> +
> + f->pixelformat = rvin_formats[f->index].fourcc;
> +
> + return 0;
> +}
> +
> +static int rvin_g_selection(struct file *file, void *fh,
> + struct v4l2_selection *s)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> +
> + switch (s->target) {
> + case V4L2_SEL_TGT_CROP_BOUNDS:
> + case V4L2_SEL_TGT_CROP_DEFAULT:
> + s->r.left = s->r.top = 0;
> + s->r.width = vin->sensor.width;
> + s->r.height = vin->sensor.height;
> + break;
> + case V4L2_SEL_TGT_CROP:
> + s->r = vin->crop;
> + break;
> + case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> + case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> + s->r.left = s->r.top = 0;
> + s->r.width = vin->format.width;
> + s->r.height = vin->format.height;
> + break;
> + case V4L2_SEL_TGT_COMPOSE:
> + s->r = vin->compose;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
Both g_selection and s_selection do not check the type field. I've updated
v4l2-compliance so that it checks for that.
> +
> +static void rect_set_min_size(struct v4l2_rect *r,
> + const struct v4l2_rect *min_size)
> +{
> + if (r->width < min_size->width)
> + r->width = min_size->width;
> + if (r->height < min_size->height)
> + r->height = min_size->height;
> +}
> +
> +static void rect_set_max_size(struct v4l2_rect *r,
> + const struct v4l2_rect *max_size)
> +{
> + if (r->width > max_size->width)
> + r->width = max_size->width;
> + if (r->height > max_size->height)
> + r->height = max_size->height;
> +}
> +
> +static void rect_map_inside(struct v4l2_rect *r,
> + const struct v4l2_rect *boundary)
> +{
> + rect_set_max_size(r, boundary);
> +
> + if (r->left < boundary->left)
> + r->left = boundary->left;
> + if (r->top < boundary->top)
> + r->top = boundary->top;
> + if (r->left + r->width > boundary->width)
> + r->left = boundary->width - r->width;
> + if (r->top + r->height > boundary->height)
> + r->top = boundary->height - r->height;
> +}
> +
> +static int rvin_s_selection(struct file *file, void *fh,
> + struct v4l2_selection *s)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + const struct rvin_video_format *fmt;
> + struct v4l2_rect r = s->r;
> + struct v4l2_rect max_rect;
> + struct v4l2_rect min_rect = {
> + .width = 6,
> + .height = 2,
> + };
> +
> + rect_set_min_size(&r, &min_rect);
> +
> + switch (s->target) {
> + case V4L2_SEL_TGT_CROP:
> + /* Can't crop outside of sensor input */
> + max_rect.top = max_rect.left = 0;
> + max_rect.width = vin->sensor.width;
> + max_rect.height = vin->sensor.height;
> + rect_map_inside(&r, &max_rect);
> +
> + v4l_bound_align_image(&r.width, 2, vin->sensor.width, 1,
> + &r.height, 4, vin->sensor.height, 2, 0);
> +
> + r.top = clamp_t(s32, r.top, 0, vin->sensor.height - r.height);
> + r.left = clamp_t(s32, r.left, 0, vin->sensor.width - r.width);
> +
> + vin->crop = s->r = r;
> +
> + vin_dbg(vin, "Cropped %dx%d@%d:%d of %dx%d\n",
> + r.width, r.height, r.left, r.top,
> + vin->sensor.width, vin->sensor.height);
> + break;
> + case V4L2_SEL_TGT_COMPOSE:
> + /* Make sure compose rect fits inside output format */
> + max_rect.top = max_rect.left = 0;
> + max_rect.width = vin->format.width;
> + max_rect.height = vin->format.height;
> + rect_map_inside(&r, &max_rect);
> +
> + /*
> + * Composing is done by adding a offset to the buffer address,
> + * the HW wants this address to be aligned to HW_BUFFER_MASK.
> + * Make sure the top and left values meets this requirement.
> + */
> + while ((r.top * vin->format.bytesperline) & HW_BUFFER_MASK)
> + r.top--;
> +
> + fmt = rvin_format_from_pixel(vin->format.pixelformat);
> + while ((r.left * fmt->bpp) & HW_BUFFER_MASK)
> + r.left--;
> +
> + vin->compose = s->r = r;
> +
> + vin_dbg(vin, "Compose %dx%d@%d:%d in %dx%d\n",
> + r.width, r.height, r.left, r.top,
> + vin->format.width, vin->format.height);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + /* HW supports modifying configuration while running */
> + rvin_crop_scale_comp(vin);
> +
> + return 0;
> +}
> +
> +static int rvin_cropcap(struct file *file, void *priv,
> + struct v4l2_cropcap *crop)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + return v4l2_subdev_call(sd, video, cropcap, crop);
> +}
This should also check the type field. I've updated v4l2-compliance to
check this as well.
> +
> +static int rvin_enum_input(struct file *file, void *priv,
> + struct v4l2_input *i)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> +
> + if (i->index != 0)
> + return -EINVAL;
> +
> + i->type = V4L2_INPUT_TYPE_CAMERA;
> + i->std = vin->vdev.tvnorms;
> + strlcpy(i->name, "Camera", sizeof(i->name));
You should call the video op g_input_status() here to fill in the
v4l2_input status field. Without that the application won't know if
there is a valid signal or not.
> +
> + return 0;
> +}
> +
> +static int rvin_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> + *i = 0;
> + return 0;
> +}
> +
> +static int rvin_s_input(struct file *file, void *priv, unsigned int i)
> +{
> + if (i > 0)
> + return -EINVAL;
> + return 0;
> +}
> +
> +static int rvin_querystd(struct file *file, void *priv, v4l2_std_id *a)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + return v4l2_subdev_call(sd, video, querystd, a);
> +}
> +
> +static int rvin_s_std(struct file *file, void *priv, v4l2_std_id a)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + return v4l2_subdev_call(sd, video, s_std, a);
> +}
> +
> +static int rvin_g_std(struct file *file, void *priv, v4l2_std_id *a)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + return v4l2_subdev_call(sd, video, g_std, a);
> +}
> +
> +static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
> + .vidioc_querycap = rvin_querycap,
> + .vidioc_try_fmt_vid_cap = rvin_try_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap = rvin_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = rvin_s_fmt_vid_cap,
> + .vidioc_enum_fmt_vid_cap = rvin_enum_fmt_vid_cap,
> +
> + .vidioc_g_selection = rvin_g_selection,
> + .vidioc_s_selection = rvin_s_selection,
> +
> + .vidioc_cropcap = rvin_cropcap,
> +
> + .vidioc_enum_input = rvin_enum_input,
> + .vidioc_g_input = rvin_g_input,
> + .vidioc_s_input = rvin_s_input,
> +
> + .vidioc_querystd = rvin_querystd,
> + .vidioc_g_std = rvin_g_std,
> + .vidioc_s_std = rvin_s_std,
> +
> + .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_prepare_buf = vb2_ioctl_prepare_buf,
> + .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,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * File Operations
> + */
> +
> +static int rvin_power_on(struct rvin_dev *vin)
> +{
> + int ret;
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + pm_runtime_get_sync(vin->v4l2_dev.dev);
> +
> + ret = v4l2_subdev_call(sd, core, s_power, 1);
> + if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> + return ret;
> + return 0;
> +}
> +
> +static int rvin_power_off(struct rvin_dev *vin)
> +{
> + int ret;
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> +
> + ret = v4l2_subdev_call(sd, core, s_power, 0);
> +
> + pm_runtime_put(vin->v4l2_dev.dev);
> +
> + if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int rvin_initialize_device(struct file *file)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + int ret;
> +
> + struct v4l2_format f = {
> + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + .fmt.pix = {
> + .width = vin->format.width,
> + .height = vin->format.height,
> + .field = vin->format.field,
> + .colorspace = vin->format.colorspace,
> + .pixelformat = vin->format.pixelformat,
> + },
> + };
> +
> + ret = rvin_power_on(vin);
> + if (ret < 0)
> + return ret;
> +
> + pm_runtime_enable(&vin->vdev.dev);
> + ret = pm_runtime_resume(&vin->vdev.dev);
> + if (ret < 0 && ret != -ENOSYS)
> + goto eresume;
> +
> + /*
> + * Try to configure with default parameters. Notice: this is the
> + * very first open, so, we cannot race against other calls,
> + * apart from someone else calling open() simultaneously, but
> + * .host_lock is protecting us against it.
> + */
> + ret = rvin_s_fmt_vid_cap(file, NULL, &f);
> + if (ret < 0)
> + goto esfmt;
> +
> + v4l2_ctrl_handler_setup(&vin->ctrl_handler);
> +
> + return 0;
> +esfmt:
> + pm_runtime_disable(&vin->vdev.dev);
> +eresume:
> + rvin_power_off(vin);
> +
> + return ret;
> +}
> +
> +static int rvin_open(struct file *file)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + int ret;
> +
> + mutex_lock(&vin->lock);
> +
> + file->private_data = vin;
> +
> + ret = v4l2_fh_open(file);
> + if (ret)
> + goto unlock;
> +
> + if (!v4l2_fh_is_singular_file(file))
> + goto unlock;
> +
> + if (rvin_initialize_device(file)) {
> + v4l2_fh_release(file);
> + ret = -ENODEV;
> + }
> +
> +unlock:
> + mutex_unlock(&vin->lock);
> + return ret;
> +}
> +
> +static int rvin_release(struct file *file)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + bool fh_singular;
> + int ret;
> +
> + mutex_lock(&vin->lock);
> +
> + /* Save the singular status before we call the clean-up helper */
> + fh_singular = v4l2_fh_is_singular_file(file);
> +
> + /* the release helper will cleanup any on-going streaming */
> + ret = _vb2_fop_release(file, NULL);
> +
> + /*
> + * If this was the last open file.
> + * Then de-initialize hw module.
> + */
> + if (fh_singular) {
> + pm_runtime_suspend(&vin->vdev.dev);
> + pm_runtime_disable(&vin->vdev.dev);
> + rvin_power_off(vin);
> + }
> +
> + mutex_unlock(&vin->lock);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_file_operations rvin_fops = {
> + .owner = THIS_MODULE,
> + .unlocked_ioctl = video_ioctl2,
> + .open = rvin_open,
> + .release = rvin_release,
> + .poll = vb2_fop_poll,
> + .mmap = vb2_fop_mmap,
> + .read = vb2_fop_read,
> +};
> +
> +void rvin_v4l2_remove(struct rvin_dev *vin)
> +{
> + v4l2_info(&vin->v4l2_dev, "Removing %s\n",
> + video_device_node_name(&vin->vdev));
> +
> + /* Checks internaly if handlers have been init or not */
> + v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +
> + /* Checks internaly if vdev have been init or not */
> + video_unregister_device(&vin->vdev);
> +}
> +
> +int rvin_v4l2_probe(struct rvin_dev *vin)
> +{
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + struct v4l2_mbus_framefmt *mf = &fmt.format;
> + struct video_device *vdev = &vin->vdev;
> + struct v4l2_subdev *sd = vin_to_sd(vin);
> + int ret;
> +
> + v4l2_set_subdev_hostdata(sd, vin);
> +
> + ret = v4l2_subdev_call(sd, video, g_tvnorms, &vin->vdev.tvnorms);
> + if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> + return ret;
> +
> + if (vin->vdev.tvnorms == 0) {
> + /* Disable the STD API if there are no tvnorms defined */
> + v4l2_disable_ioctl(&vin->vdev, VIDIOC_G_STD);
> + v4l2_disable_ioctl(&vin->vdev, VIDIOC_S_STD);
> + v4l2_disable_ioctl(&vin->vdev, VIDIOC_QUERYSTD);
> + v4l2_disable_ioctl(&vin->vdev, VIDIOC_ENUMSTD);
> + }
> +
> + /* Add the controls */
> + /*
> + * Currently the subdev with the largest number of controls (13) is
> + * ov6550. So let's pick 16 as a hint for the control handler. Note
> + * that this is a hint only: too large and you waste some memory, too
> + * small and there is a (very) small performance hit when looking up
> + * controls in the internal hash.
> + */
> + ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 16);
> + if (ret < 0)
> + return ret;
> +
> + ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, sd->ctrl_handler, NULL);
> + if (ret < 0)
> + return ret;
> +
> + /* video node */
> + vdev->fops = &rvin_fops;
> + vdev->v4l2_dev = &vin->v4l2_dev;
> + vdev->queue = &vin->queue;
> + strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
> + vdev->release = video_device_release_empty;
> + vdev->ioctl_ops = &rvin_ioctl_ops;
> + vdev->lock = &vin->lock;
> + vdev->ctrl_handler = &vin->ctrl_handler;
> +
> + /* Try to improve our guess of a reasonable window format */
> + ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
> + if (ret) {
> + vin_err(vin, "Failed to get initial format\n");
> + return ret;
> + }
> +
> + /* Set default format */
> + vin->format.width = mf->width;
> + vin->format.height = mf->height;
> + vin->format.colorspace = mf->colorspace;
> + vin->format.field = mf->field;
> + vin->format.pixelformat = RVIN_DEFAULT_FORMAT;
> +
> +
> + /* Set initial crop and compose */
> + vin->crop.top = vin->crop.left = 0;
> + vin->crop.width = mf->width;
> + vin->crop.height = mf->height;
> +
> + vin->compose.top = vin->compose.left = 0;
> + vin->compose.width = mf->width;
> + vin->compose.height = mf->height;
> +
> + ret = video_register_device(&vin->vdev, VFL_TYPE_GRABBER, -1);
> + if (ret) {
> + vin_err(vin, "Failed to register video device\n");
> + return ret;
> + }
> +
> + video_set_drvdata(&vin->vdev, vin);
> +
> + v4l2_info(&vin->v4l2_dev, "Device registered as %s\n",
> + video_device_node_name(&vin->vdev));
> +
> + return ret;
> +}
Regards,
Hans
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