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OpenCloudOS-Kernel/drivers/media/v4l2-core/v4l2-subdev.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* V4L2 sub-device
*
* Copyright (C) 2010 Nokia Corporation
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
* Sakari Ailus <sakari.ailus@iki.fi>
*/
#include <linux/ioctl.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/export.h>
#include <linux/version.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>
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
struct v4l2_subdev_state *state;
static struct lock_class_key key;
state = __v4l2_subdev_state_alloc(sd, "fh->state->lock", &key);
if (IS_ERR(state))
return PTR_ERR(state);
fh->state = state;
return 0;
}
static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
__v4l2_subdev_state_free(fh->state);
fh->state = NULL;
}
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;
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 (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
struct module *owner;
owner = sd->entity.graph_obj.mdev->dev->driver->owner;
if (!try_module_get(owner)) {
ret = -EBUSY;
goto err;
}
subdev_fh->owner = owner;
}
if (sd->internal_ops && sd->internal_ops->open) {
ret = sd->internal_ops->open(sd, subdev_fh);
if (ret < 0)
goto err;
}
return 0;
err:
module_put(subdev_fh->owner);
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);
module_put(subdev_fh->owner);
v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
subdev_fh_free(subdev_fh);
kfree(subdev_fh);
file->private_data = NULL;
return 0;
}
#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static int subdev_open(struct file *file)
{
return -ENODEV;
}
static int subdev_close(struct file *file)
{
return -ENODEV;
}
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static inline int check_which(u32 which)
{
if (which != V4L2_SUBDEV_FORMAT_TRY &&
which != V4L2_SUBDEV_FORMAT_ACTIVE)
return -EINVAL;
return 0;
}
static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
{
#if defined(CONFIG_MEDIA_CONTROLLER)
if (sd->entity.num_pads) {
if (pad >= sd->entity.num_pads)
return -EINVAL;
return 0;
}
#endif
/* allow pad 0 on subdevices not registered as media entities */
if (pad > 0)
return -EINVAL;
return 0;
}
static int check_state_pads(u32 which, struct v4l2_subdev_state *state)
{
if (which == V4L2_SUBDEV_FORMAT_TRY && (!state || !state->pads))
return -EINVAL;
return 0;
}
static inline int check_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
if (!format)
return -EINVAL;
return check_which(format->which) ? : check_pad(sd, format->pad) ? :
check_state_pads(format->which, state);
}
static int call_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
return check_format(sd, state, format) ? :
sd->ops->pad->get_fmt(sd, state, format);
}
static int call_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
return check_format(sd, state, format) ? :
sd->ops->pad->set_fmt(sd, state, format);
}
static int call_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_mbus_code_enum *code)
{
if (!code)
return -EINVAL;
return check_which(code->which) ? : check_pad(sd, code->pad) ? :
check_state_pads(code->which, state) ? :
sd->ops->pad->enum_mbus_code(sd, state, code);
}
static int call_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_size_enum *fse)
{
if (!fse)
return -EINVAL;
return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
check_state_pads(fse->which, state) ? :
sd->ops->pad->enum_frame_size(sd, state, fse);
}
static inline int check_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
if (!fi)
return -EINVAL;
return check_pad(sd, fi->pad);
}
static int call_g_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
return check_frame_interval(sd, fi) ? :
sd->ops->video->g_frame_interval(sd, fi);
}
static int call_s_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
return check_frame_interval(sd, fi) ? :
sd->ops->video->s_frame_interval(sd, fi);
}
static int call_enum_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval_enum *fie)
{
if (!fie)
return -EINVAL;
return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
check_state_pads(fie->which, state) ? :
sd->ops->pad->enum_frame_interval(sd, state, fie);
}
static inline int check_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_selection *sel)
{
if (!sel)
return -EINVAL;
return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
check_state_pads(sel->which, state);
}
static int call_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_selection *sel)
{
return check_selection(sd, state, sel) ? :
sd->ops->pad->get_selection(sd, state, sel);
}
static int call_set_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_selection *sel)
{
return check_selection(sd, state, sel) ? :
sd->ops->pad->set_selection(sd, state, sel);
}
static inline int check_edid(struct v4l2_subdev *sd,
struct v4l2_subdev_edid *edid)
{
if (!edid)
return -EINVAL;
if (edid->blocks && edid->edid == NULL)
return -EINVAL;
return check_pad(sd, edid->pad);
}
static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
{
return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
}
static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
{
return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
}
static int call_dv_timings_cap(struct v4l2_subdev *sd,
struct v4l2_dv_timings_cap *cap)
{
if (!cap)
return -EINVAL;
return check_pad(sd, cap->pad) ? :
sd->ops->pad->dv_timings_cap(sd, cap);
}
static int call_enum_dv_timings(struct v4l2_subdev *sd,
struct v4l2_enum_dv_timings *dvt)
{
if (!dvt)
return -EINVAL;
return check_pad(sd, dvt->pad) ? :
sd->ops->pad->enum_dv_timings(sd, dvt);
}
static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_config *config)
{
return check_pad(sd, pad) ? :
sd->ops->pad->get_mbus_config(sd, pad, config);
}
#ifdef CONFIG_MEDIA_CONTROLLER
/*
* Create state-management wrapper for pad ops dealing with subdev state. The
* wrapper handles the case where the caller does not provide the called
* subdev's state. This should be removed when all the callers are fixed.
*/
#define DEFINE_STATE_WRAPPER(f, arg_type) \
static int call_##f##_state(struct v4l2_subdev *sd, \
struct v4l2_subdev_state *_state, \
arg_type *arg) \
{ \
struct v4l2_subdev_state *state = _state; \
int ret; \
if (!_state) \
state = v4l2_subdev_lock_and_get_active_state(sd); \
ret = call_##f(sd, state, arg); \
if (!_state && state) \
v4l2_subdev_unlock_state(state); \
return ret; \
}
#else /* CONFIG_MEDIA_CONTROLLER */
#define DEFINE_STATE_WRAPPER(f, arg_type) \
static int call_##f##_state(struct v4l2_subdev *sd, \
struct v4l2_subdev_state *state, \
arg_type *arg) \
{ \
return call_##f(sd, state, arg); \
}
#endif /* CONFIG_MEDIA_CONTROLLER */
DEFINE_STATE_WRAPPER(get_fmt, struct v4l2_subdev_format);
DEFINE_STATE_WRAPPER(set_fmt, struct v4l2_subdev_format);
DEFINE_STATE_WRAPPER(enum_mbus_code, struct v4l2_subdev_mbus_code_enum);
DEFINE_STATE_WRAPPER(enum_frame_size, struct v4l2_subdev_frame_size_enum);
DEFINE_STATE_WRAPPER(enum_frame_interval, struct v4l2_subdev_frame_interval_enum);
DEFINE_STATE_WRAPPER(get_selection, struct v4l2_subdev_selection);
DEFINE_STATE_WRAPPER(set_selection, struct v4l2_subdev_selection);
static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
.get_fmt = call_get_fmt_state,
.set_fmt = call_set_fmt_state,
.enum_mbus_code = call_enum_mbus_code_state,
.enum_frame_size = call_enum_frame_size_state,
.enum_frame_interval = call_enum_frame_interval_state,
.get_selection = call_get_selection_state,
.set_selection = call_set_selection_state,
.get_edid = call_get_edid,
.set_edid = call_set_edid,
.dv_timings_cap = call_dv_timings_cap,
.enum_dv_timings = call_enum_dv_timings,
.get_mbus_config = call_get_mbus_config,
};
static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
.g_frame_interval = call_g_frame_interval,
.s_frame_interval = call_s_frame_interval,
};
const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
.pad = &v4l2_subdev_call_pad_wrappers,
.video = &v4l2_subdev_call_video_wrappers,
};
EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static struct v4l2_subdev_state *
subdev_ioctl_get_state(struct v4l2_subdev *sd, struct v4l2_subdev_fh *subdev_fh,
unsigned int cmd, void *arg)
{
u32 which;
switch (cmd) {
default:
return NULL;
case VIDIOC_SUBDEV_G_FMT:
case VIDIOC_SUBDEV_S_FMT:
which = ((struct v4l2_subdev_format *)arg)->which;
break;
case VIDIOC_SUBDEV_G_CROP:
case VIDIOC_SUBDEV_S_CROP:
which = ((struct v4l2_subdev_crop *)arg)->which;
break;
case VIDIOC_SUBDEV_ENUM_MBUS_CODE:
which = ((struct v4l2_subdev_mbus_code_enum *)arg)->which;
break;
case VIDIOC_SUBDEV_ENUM_FRAME_SIZE:
which = ((struct v4l2_subdev_frame_size_enum *)arg)->which;
break;
case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL:
which = ((struct v4l2_subdev_frame_interval_enum *)arg)->which;
break;
case VIDIOC_SUBDEV_G_SELECTION:
case VIDIOC_SUBDEV_S_SELECTION:
which = ((struct v4l2_subdev_selection *)arg)->which;
break;
}
return which == V4L2_SUBDEV_FORMAT_TRY ?
subdev_fh->state :
v4l2_subdev_get_unlocked_active_state(sd);
}
static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
struct v4l2_subdev_state *state)
{
struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
struct v4l2_fh *vfh = file->private_data;
bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
int rval;
switch (cmd) {
case VIDIOC_SUBDEV_QUERYCAP: {
struct v4l2_subdev_capability *cap = arg;
memset(cap->reserved, 0, sizeof(cap->reserved));
cap->version = LINUX_VERSION_CODE;
cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
return 0;
}
case VIDIOC_QUERYCTRL:
/*
* TODO: this really should be folded into v4l2_queryctrl (this
* currently returns -EINVAL for NULL control handlers).
* However, v4l2_queryctrl() is still called directly by
* drivers as well and until that has been addressed I believe
* it is safer to do the check here. The same is true for the
* other control ioctls below.
*/
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_queryctrl(vfh->ctrl_handler, arg);
case VIDIOC_QUERY_EXT_CTRL:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
case VIDIOC_QUERYMENU:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_querymenu(vfh->ctrl_handler, arg);
case VIDIOC_G_CTRL:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_g_ctrl(vfh->ctrl_handler, arg);
case VIDIOC_S_CTRL:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
case VIDIOC_G_EXT_CTRLS:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_g_ext_ctrls(vfh->ctrl_handler,
vdev, sd->v4l2_dev->mdev, arg);
case VIDIOC_S_EXT_CTRLS:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
vdev, sd->v4l2_dev->mdev, arg);
case VIDIOC_TRY_EXT_CTRLS:
if (!vfh->ctrl_handler)
return -ENOTTY;
return v4l2_try_ext_ctrls(vfh->ctrl_handler,
vdev, sd->v4l2_dev->mdev, 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);
}
case VIDIOC_DBG_G_CHIP_INFO:
{
struct v4l2_dbg_chip_info *p = arg;
if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
return -EINVAL;
if (sd->ops->core && sd->ops->core->s_register)
p->flags |= V4L2_CHIP_FL_WRITABLE;
if (sd->ops->core && sd->ops->core->g_register)
p->flags |= V4L2_CHIP_FL_READABLE;
strscpy(p->name, sd->name, sizeof(p->name));
return 0;
}
#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;
}
case VIDIOC_SUBDEV_G_FMT: {
struct v4l2_subdev_format *format = arg;
memset(format->reserved, 0, sizeof(format->reserved));
memset(format->format.reserved, 0, sizeof(format->format.reserved));
return v4l2_subdev_call(sd, pad, get_fmt, state, format);
}
case VIDIOC_SUBDEV_S_FMT: {
struct v4l2_subdev_format *format = arg;
if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
memset(format->reserved, 0, sizeof(format->reserved));
memset(format->format.reserved, 0, sizeof(format->format.reserved));
return v4l2_subdev_call(sd, pad, set_fmt, state, format);
}
case VIDIOC_SUBDEV_G_CROP: {
struct v4l2_subdev_crop *crop = arg;
struct v4l2_subdev_selection sel;
memset(crop->reserved, 0, sizeof(crop->reserved));
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, state, &sel);
crop->rect = sel.r;
return rval;
}
case VIDIOC_SUBDEV_S_CROP: {
struct v4l2_subdev_crop *crop = arg;
struct v4l2_subdev_selection sel;
if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
memset(crop->reserved, 0, sizeof(crop->reserved));
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, state, &sel);
crop->rect = sel.r;
return rval;
}
case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
struct v4l2_subdev_mbus_code_enum *code = arg;
memset(code->reserved, 0, sizeof(code->reserved));
return v4l2_subdev_call(sd, pad, enum_mbus_code, state,
code);
}
case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
struct v4l2_subdev_frame_size_enum *fse = arg;
memset(fse->reserved, 0, sizeof(fse->reserved));
return v4l2_subdev_call(sd, pad, enum_frame_size, state,
fse);
}
case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval *fi = arg;
memset(fi->reserved, 0, sizeof(fi->reserved));
return v4l2_subdev_call(sd, video, g_frame_interval, arg);
}
case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval *fi = arg;
if (ro_subdev)
return -EPERM;
memset(fi->reserved, 0, sizeof(fi->reserved));
return v4l2_subdev_call(sd, video, s_frame_interval, arg);
}
case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval_enum *fie = arg;
memset(fie->reserved, 0, sizeof(fie->reserved));
return v4l2_subdev_call(sd, pad, enum_frame_interval, state,
fie);
}
case VIDIOC_SUBDEV_G_SELECTION: {
struct v4l2_subdev_selection *sel = arg;
memset(sel->reserved, 0, sizeof(sel->reserved));
return v4l2_subdev_call(
sd, pad, get_selection, state, sel);
}
case VIDIOC_SUBDEV_S_SELECTION: {
struct v4l2_subdev_selection *sel = arg;
if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
memset(sel->reserved, 0, sizeof(sel->reserved));
return v4l2_subdev_call(
sd, pad, set_selection, state, sel);
}
case VIDIOC_G_EDID: {
struct v4l2_subdev_edid *edid = arg;
return v4l2_subdev_call(sd, pad, get_edid, edid);
}
case VIDIOC_S_EDID: {
struct v4l2_subdev_edid *edid = arg;
return v4l2_subdev_call(sd, pad, set_edid, edid);
}
case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
struct v4l2_dv_timings_cap *cap = arg;
return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
}
case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
struct v4l2_enum_dv_timings *dvt = arg;
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:
if (ro_subdev)
return -EPERM;
return v4l2_subdev_call(sd, video, s_dv_timings, arg);
case VIDIOC_SUBDEV_G_STD:
return v4l2_subdev_call(sd, video, g_std, arg);
case VIDIOC_SUBDEV_S_STD: {
v4l2_std_id *std = arg;
if (ro_subdev)
return -EPERM;
return v4l2_subdev_call(sd, video, s_std, *std);
}
case VIDIOC_SUBDEV_ENUMSTD: {
struct v4l2_standard *p = arg;
v4l2_std_id id;
if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
return -EINVAL;
return v4l_video_std_enumstd(p, id);
}
case VIDIOC_SUBDEV_QUERYSTD:
return v4l2_subdev_call(sd, video, querystd, arg);
default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
}
return 0;
}
static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct mutex *lock = vdev->lock;
long ret = -ENODEV;
if (lock && mutex_lock_interruptible(lock))
return -ERESTARTSYS;
if (video_is_registered(vdev)) {
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);
struct v4l2_subdev_state *state;
state = subdev_ioctl_get_state(sd, subdev_fh, cmd, arg);
if (state)
v4l2_subdev_lock_state(state);
ret = subdev_do_ioctl(file, cmd, arg, state);
if (state)
v4l2_subdev_unlock_state(state);
}
if (lock)
mutex_unlock(lock);
return ret;
}
static long subdev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
}
#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
#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static long subdev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
return -ENODEV;
}
#ifdef CONFIG_COMPAT
static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
unsigned long arg)
{
return -ENODEV;
}
#endif
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static __poll_t 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 EPOLLERR;
poll_wait(file, &fh->wait, wait);
if (v4l2_event_pending(fh))
return EPOLLPRI;
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_get_fwnode_pad_1_to_1(struct media_entity *entity,
struct fwnode_endpoint *endpoint)
{
struct fwnode_handle *fwnode;
struct v4l2_subdev *sd;
if (!is_media_entity_v4l2_subdev(entity))
return -EINVAL;
sd = media_entity_to_v4l2_subdev(entity);
fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
fwnode_handle_put(fwnode);
if (dev_fwnode(sd->dev) == fwnode)
return endpoint->port;
return -ENXIO;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
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)
{
bool pass = true;
/* The width, height and code must match. */
if (source_fmt->format.width != sink_fmt->format.width) {
dev_dbg(sd->entity.graph_obj.mdev->dev,
"%s: width does not match (source %u, sink %u)\n",
__func__,
source_fmt->format.width, sink_fmt->format.width);
pass = false;
}
if (source_fmt->format.height != sink_fmt->format.height) {
dev_dbg(sd->entity.graph_obj.mdev->dev,
"%s: height does not match (source %u, sink %u)\n",
__func__,
source_fmt->format.height, sink_fmt->format.height);
pass = false;
}
if (source_fmt->format.code != sink_fmt->format.code) {
dev_dbg(sd->entity.graph_obj.mdev->dev,
"%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
__func__,
source_fmt->format.code, sink_fmt->format.code);
pass = false;
}
/* 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) {
dev_dbg(sd->entity.graph_obj.mdev->dev,
"%s: field does not match (source %u, sink %u)\n",
__func__,
source_fmt->format.field, sink_fmt->format.field);
pass = false;
}
if (pass)
return 0;
dev_dbg(sd->entity.graph_obj.mdev->dev,
"%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
link->source->entity->name, link->source->index,
link->sink->entity->name, link->sink->index);
return -EPIPE;
}
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 (is_media_entity_v4l2_subdev(pad->entity)) {
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_state_active(sd, pad, get_fmt, fmt);
}
WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
"Driver bug! Wrong media entity type 0x%08x, entity %s\n",
pad->entity->function, 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);
struct v4l2_subdev_state *
__v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
struct lock_class_key *lock_key)
{
struct v4l2_subdev_state *state;
int ret;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return ERR_PTR(-ENOMEM);
__mutex_init(&state->_lock, lock_name, lock_key);
if (sd->state_lock)
state->lock = sd->state_lock;
else
state->lock = &state->_lock;
if (sd->entity.num_pads) {
state->pads = kvcalloc(sd->entity.num_pads,
sizeof(*state->pads), GFP_KERNEL);
if (!state->pads) {
ret = -ENOMEM;
goto err;
}
}
/*
* There can be no race at this point, but we lock the state anyway to
* satisfy lockdep checks.
*/
v4l2_subdev_lock_state(state);
ret = v4l2_subdev_call(sd, pad, init_cfg, state);
v4l2_subdev_unlock_state(state);
if (ret < 0 && ret != -ENOIOCTLCMD)
goto err;
return state;
err:
if (state && state->pads)
kvfree(state->pads);
kfree(state);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_alloc);
void __v4l2_subdev_state_free(struct v4l2_subdev_state *state)
{
if (!state)
return;
mutex_destroy(&state->_lock);
kvfree(state->pads);
kfree(state);
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_free);
int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
struct lock_class_key *key)
{
struct v4l2_subdev_state *state;
state = __v4l2_subdev_state_alloc(sd, name, key);
if (IS_ERR(state))
return PTR_ERR(state);
sd->active_state = state;
return 0;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_init_finalize);
void v4l2_subdev_cleanup(struct v4l2_subdev *sd)
{
__v4l2_subdev_state_free(sd->active_state);
sd->active_state = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct v4l2_mbus_framefmt *fmt;
if (format->pad >= sd->entity.num_pads)
return -EINVAL;
fmt = v4l2_subdev_get_pad_format(sd, state, format->pad);
if (!fmt)
return -EINVAL;
format->format = *fmt;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#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.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
#endif
}
EXPORT_SYMBOL(v4l2_subdev_init);
void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
const struct v4l2_event *ev)
{
v4l2_event_queue(sd->devnode, ev);
v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
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