--- /dev/null
+/*
+ * V4L2 sub-device
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ * Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/videodev2.h>
+#include <linux/export.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+
+static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
+{
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+ fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
+ if (fh->pad == NULL)
+ return -ENOMEM;
+#endif
+ return 0;
+}
+
+static void subdev_fh_free(struct v4l2_subdev_fh *fh)
+{
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+ kfree(fh->pad);
+ fh->pad = NULL;
+#endif
+}
+
+static int subdev_open(struct file *file)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_subdev_fh *subdev_fh;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ struct media_entity *entity = NULL;
+#endif
+ int ret;
+
+ subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
+ if (subdev_fh == NULL)
+ return -ENOMEM;
+
+ ret = subdev_fh_init(subdev_fh, sd);
+ if (ret) {
+ kfree(subdev_fh);
+ return ret;
+ }
+
+ v4l2_fh_init(&subdev_fh->vfh, vdev);
+ v4l2_fh_add(&subdev_fh->vfh);
+ file->private_data = &subdev_fh->vfh;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (sd->v4l2_dev->mdev) {
+ entity = media_entity_get(&sd->entity);
+ if (!entity) {
+ ret = -EBUSY;
+ goto err;
+ }
+ }
+#endif
+
+ if (sd->internal_ops && sd->internal_ops->open) {
+ ret = sd->internal_ops->open(sd, subdev_fh);
+ if (ret < 0)
+ goto err;
+ }
+
+ return 0;
+
+err:
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ media_entity_put(entity);
+#endif
+ v4l2_fh_del(&subdev_fh->vfh);
+ v4l2_fh_exit(&subdev_fh->vfh);
+ subdev_fh_free(subdev_fh);
+ kfree(subdev_fh);
+
+ return ret;
+}
+
+static int subdev_close(struct file *file)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *vfh = file->private_data;
+ struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
+
+ if (sd->internal_ops && sd->internal_ops->close)
+ sd->internal_ops->close(sd, subdev_fh);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (sd->v4l2_dev->mdev)
+ media_entity_put(&sd->entity);
+#endif
+ v4l2_fh_del(vfh);
+ v4l2_fh_exit(vfh);
+ subdev_fh_free(subdev_fh);
+ kfree(subdev_fh);
+ file->private_data = NULL;
+
+ return 0;
+}
+
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+static int check_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_format *format)
+{
+ if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
+ format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (format->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop)
+{
+ if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
+ crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (crop->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int check_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_selection *sel)
+{
+ if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
+ sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (sel->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
+{
+ if (edid->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ if (edid->blocks && edid->edid == NULL)
+ return -EINVAL;
+
+ return 0;
+}
+#endif
+
+static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *vfh = file->private_data;
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+ struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
+ int rval;
+#endif
+
+ switch (cmd) {
+ case VIDIOC_QUERYCTRL:
+ return v4l2_queryctrl(vfh->ctrl_handler, arg);
+
+ case VIDIOC_QUERY_EXT_CTRL:
+ return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
+
+ case VIDIOC_QUERYMENU:
+ return v4l2_querymenu(vfh->ctrl_handler, arg);
+
+ case VIDIOC_G_CTRL:
+ return v4l2_g_ctrl(vfh->ctrl_handler, arg);
+
+ case VIDIOC_S_CTRL:
+ return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
+
+ case VIDIOC_G_EXT_CTRLS:
+ return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
+
+ case VIDIOC_S_EXT_CTRLS:
+ return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
+
+ case VIDIOC_TRY_EXT_CTRLS:
+ return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
+
+ case VIDIOC_DQEVENT:
+ if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+ return -ENOIOCTLCMD;
+
+ return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
+
+ case VIDIOC_SUBSCRIBE_EVENT:
+ return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
+
+ case VIDIOC_UNSUBSCRIBE_EVENT:
+ return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ case VIDIOC_DBG_G_REGISTER:
+ {
+ struct v4l2_dbg_register *p = arg;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return v4l2_subdev_call(sd, core, g_register, p);
+ }
+ case VIDIOC_DBG_S_REGISTER:
+ {
+ struct v4l2_dbg_register *p = arg;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return v4l2_subdev_call(sd, core, s_register, p);
+ }
+#endif
+
+ case VIDIOC_LOG_STATUS: {
+ int ret;
+
+ pr_info("%s: ================= START STATUS =================\n",
+ sd->name);
+ ret = v4l2_subdev_call(sd, core, log_status);
+ pr_info("%s: ================== END STATUS ==================\n",
+ sd->name);
+ return ret;
+ }
+
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+ case VIDIOC_SUBDEV_G_FMT: {
+ struct v4l2_subdev_format *format = arg;
+
+ rval = check_format(sd, format);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
+ }
+
+ case VIDIOC_SUBDEV_S_FMT: {
+ struct v4l2_subdev_format *format = arg;
+
+ rval = check_format(sd, format);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
+ }
+
+ case VIDIOC_SUBDEV_G_CROP: {
+ struct v4l2_subdev_crop *crop = arg;
+ struct v4l2_subdev_selection sel;
+
+ rval = check_crop(sd, crop);
+ if (rval)
+ return rval;
+
+ memset(&sel, 0, sizeof(sel));
+ sel.which = crop->which;
+ sel.pad = crop->pad;
+ sel.target = V4L2_SEL_TGT_CROP;
+
+ rval = v4l2_subdev_call(
+ sd, pad, get_selection, subdev_fh->pad, &sel);
+
+ crop->rect = sel.r;
+
+ return rval;
+ }
+
+ case VIDIOC_SUBDEV_S_CROP: {
+ struct v4l2_subdev_crop *crop = arg;
+ struct v4l2_subdev_selection sel;
+
+ rval = check_crop(sd, crop);
+ if (rval)
+ return rval;
+
+ memset(&sel, 0, sizeof(sel));
+ sel.which = crop->which;
+ sel.pad = crop->pad;
+ sel.target = V4L2_SEL_TGT_CROP;
+ sel.r = crop->rect;
+
+ rval = v4l2_subdev_call(
+ sd, pad, set_selection, subdev_fh->pad, &sel);
+
+ crop->rect = sel.r;
+
+ return rval;
+ }
+
+ case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
+ struct v4l2_subdev_mbus_code_enum *code = arg;
+
+ if (code->which != V4L2_SUBDEV_FORMAT_TRY &&
+ code->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (code->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
+ code);
+ }
+
+ case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
+ struct v4l2_subdev_frame_size_enum *fse = arg;
+
+ if (fse->which != V4L2_SUBDEV_FORMAT_TRY &&
+ fse->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (fse->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
+ fse);
+ }
+
+ case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
+ struct v4l2_subdev_frame_interval *fi = arg;
+
+ if (fi->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, video, g_frame_interval, arg);
+ }
+
+ case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
+ struct v4l2_subdev_frame_interval *fi = arg;
+
+ if (fi->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, video, s_frame_interval, arg);
+ }
+
+ case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
+ struct v4l2_subdev_frame_interval_enum *fie = arg;
+
+ if (fie->which != V4L2_SUBDEV_FORMAT_TRY &&
+ fie->which != V4L2_SUBDEV_FORMAT_ACTIVE)
+ return -EINVAL;
+
+ if (fie->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
+ fie);
+ }
+
+ case VIDIOC_SUBDEV_G_SELECTION: {
+ struct v4l2_subdev_selection *sel = arg;
+
+ rval = check_selection(sd, sel);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(
+ sd, pad, get_selection, subdev_fh->pad, sel);
+ }
+
+ case VIDIOC_SUBDEV_S_SELECTION: {
+ struct v4l2_subdev_selection *sel = arg;
+
+ rval = check_selection(sd, sel);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(
+ sd, pad, set_selection, subdev_fh->pad, sel);
+ }
+
+ case VIDIOC_G_EDID: {
+ struct v4l2_subdev_edid *edid = arg;
+
+ rval = check_edid(sd, edid);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(sd, pad, get_edid, edid);
+ }
+
+ case VIDIOC_S_EDID: {
+ struct v4l2_subdev_edid *edid = arg;
+
+ rval = check_edid(sd, edid);
+ if (rval)
+ return rval;
+
+ return v4l2_subdev_call(sd, pad, set_edid, edid);
+ }
+
+ case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
+ struct v4l2_dv_timings_cap *cap = arg;
+
+ if (cap->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
+ }
+
+ case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
+ struct v4l2_enum_dv_timings *dvt = arg;
+
+ if (dvt->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
+ }
+
+ case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
+ return v4l2_subdev_call(sd, video, query_dv_timings, arg);
+
+ case VIDIOC_SUBDEV_G_DV_TIMINGS:
+ return v4l2_subdev_call(sd, video, g_dv_timings, arg);
+
+ case VIDIOC_SUBDEV_S_DV_TIMINGS:
+ return v4l2_subdev_call(sd, video, s_dv_timings, arg);
+#endif
+ default:
+ return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
+ }
+
+ return 0;
+}
+
+static long subdev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return video_usercopy(file, cmd, arg, subdev_do_ioctl);
+}
+
+#ifdef CONFIG_COMPAT
+static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+
+ return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
+}
+#endif
+
+static unsigned int subdev_poll(struct file *file, poll_table *wait)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *fh = file->private_data;
+
+ if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+ return POLLERR;
+
+ poll_wait(file, &fh->wait, wait);
+
+ if (v4l2_event_pending(fh))
+ return POLLPRI;
+
+ return 0;
+}
+
+const struct v4l2_file_operations v4l2_subdev_fops = {
+ .owner = THIS_MODULE,
+ .open = subdev_open,
+ .unlocked_ioctl = subdev_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl32 = subdev_compat_ioctl32,
+#endif
+ .release = subdev_close,
+ .poll = subdev_poll,
+};
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
+ struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt)
+{
+ /* The width, height and code must match. */
+ if (source_fmt->format.width != sink_fmt->format.width
+ || source_fmt->format.height != sink_fmt->format.height
+ || source_fmt->format.code != sink_fmt->format.code)
+ return -EINVAL;
+
+ /* The field order must match, or the sink field order must be NONE
+ * to support interlaced hardware connected to bridges that support
+ * progressive formats only.
+ */
+ if (source_fmt->format.field != sink_fmt->format.field &&
+ sink_fmt->format.field != V4L2_FIELD_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
+
+static int
+v4l2_subdev_link_validate_get_format(struct media_pad *pad,
+ struct v4l2_subdev_format *fmt)
+{
+ if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) {
+ struct v4l2_subdev *sd =
+ media_entity_to_v4l2_subdev(pad->entity);
+
+ fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ fmt->pad = pad->index;
+ return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
+ }
+
+ WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L,
+ "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
+ pad->entity->type, pad->entity->name);
+
+ return -EINVAL;
+}
+
+int v4l2_subdev_link_validate(struct media_link *link)
+{
+ struct v4l2_subdev *sink;
+ struct v4l2_subdev_format sink_fmt, source_fmt;
+ int rval;
+
+ rval = v4l2_subdev_link_validate_get_format(
+ link->source, &source_fmt);
+ if (rval < 0)
+ return 0;
+
+ rval = v4l2_subdev_link_validate_get_format(
+ link->sink, &sink_fmt);
+ if (rval < 0)
+ return 0;
+
+ sink = media_entity_to_v4l2_subdev(link->sink->entity);
+
+ rval = v4l2_subdev_call(sink, pad, link_validate, link,
+ &source_fmt, &sink_fmt);
+ if (rval != -ENOIOCTLCMD)
+ return rval;
+
+ return v4l2_subdev_link_validate_default(
+ sink, link, &source_fmt, &sink_fmt);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
+#endif /* CONFIG_MEDIA_CONTROLLER */
+
+void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
+{
+ INIT_LIST_HEAD(&sd->list);
+ BUG_ON(!ops);
+ sd->ops = ops;
+ sd->v4l2_dev = NULL;
+ sd->flags = 0;
+ sd->name[0] = '\0';
+ sd->grp_id = 0;
+ sd->dev_priv = NULL;
+ sd->host_priv = NULL;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ sd->entity.name = sd->name;
+ sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
+#endif
+}
+EXPORT_SYMBOL(v4l2_subdev_init);
Code Review / kvmfornfv.git / blobdiff