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mirror_ubuntu-kernels/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/export.h>
#include <linux/ioctl.h>
#include <linux/leds.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
/*
* The Streams API is an experimental feature. To use the Streams API, set
* 'v4l2_subdev_enable_streams_api' to 1 below.
*/
static bool v4l2_subdev_enable_streams_api;
#endif
/*
* Maximum stream ID is 63 for now, as we use u64 bitmask to represent a set
* of streams.
*
* Note that V4L2_FRAME_DESC_ENTRY_MAX is related: V4L2_FRAME_DESC_ENTRY_MAX
* restricts the total number of streams in a pad, although the stream ID is
* not restricted.
*/
#define V4L2_SUBDEV_MAX_STREAM_ID 63
#include "v4l2-subdev-priv.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(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
u32 which, u32 pad, u32 stream)
{
if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
if (!v4l2_subdev_state_get_format(state, pad, stream))
return -EINVAL;
return 0;
#else
return -EINVAL;
#endif
}
if (stream != 0)
return -EINVAL;
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(sd, state, format->which, format->pad, format->stream);
}
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(sd, state, code->which, code->pad, code->stream) ? :
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(sd, state, fse->which, fse->pad, fse->stream) ? :
sd->ops->pad->enum_frame_size(sd, state, fse);
}
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(sd, state, fie->which, fie->pad, fie->stream) ? :
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(sd, state, sel->which, sel->pad, sel->stream);
}
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_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *fi)
{
if (!fi)
return -EINVAL;
return check_which(fi->which) ? : check_pad(sd, fi->pad) ? :
check_state(sd, state, fi->which, fi->pad, fi->stream);
}
static int call_get_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *fi)
{
return check_frame_interval(sd, state, fi) ? :
sd->ops->pad->get_frame_interval(sd, state, fi);
}
static int call_set_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *fi)
{
return check_frame_interval(sd, state, fi) ? :
sd->ops->pad->set_frame_interval(sd, state, fi);
}
static int call_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd)
{
unsigned int i;
int ret;
memset(fd, 0, sizeof(*fd));
ret = sd->ops->pad->get_frame_desc(sd, pad, fd);
if (ret)
return ret;
dev_dbg(sd->dev, "Frame descriptor on pad %u, type %s\n", pad,
fd->type == V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL ? "parallel" :
fd->type == V4L2_MBUS_FRAME_DESC_TYPE_CSI2 ? "CSI-2" :
"unknown");
for (i = 0; i < fd->num_entries; i++) {
struct v4l2_mbus_frame_desc_entry *entry = &fd->entry[i];
char buf[20] = "";
if (fd->type == V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
WARN_ON(snprintf(buf, sizeof(buf),
", vc %u, dt 0x%02x",
entry->bus.csi2.vc,
entry->bus.csi2.dt) >= sizeof(buf));
dev_dbg(sd->dev,
"\tstream %u, code 0x%04x, length %u, flags 0x%04x%s\n",
entry->stream, entry->pixelcode, entry->length,
entry->flags, buf);
}
return 0;
}
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);
}
static int call_s_stream(struct v4l2_subdev *sd, int enable)
{
int ret;
/*
* The .s_stream() operation must never be called to start or stop an
* already started or stopped subdev. Catch offenders but don't return
* an error yet to avoid regressions.
*
* As .s_stream() is mutually exclusive with the .enable_streams() and
* .disable_streams() operation, we can use the enabled_streams field
* to store the subdev streaming state.
*/
if (WARN_ON(!!sd->enabled_streams == !!enable))
return 0;
#if IS_REACHABLE(CONFIG_LEDS_CLASS)
if (!IS_ERR_OR_NULL(sd->privacy_led)) {
if (enable)
led_set_brightness(sd->privacy_led,
sd->privacy_led->max_brightness);
else
led_set_brightness(sd->privacy_led, 0);
}
#endif
ret = sd->ops->video->s_stream(sd, enable);
if (!enable && ret < 0) {
dev_warn(sd->dev, "disabling streaming failed (%d)\n", ret);
ret = 0;
}
if (!ret)
sd->enabled_streams = enable ? BIT(0) : 0;
return ret;
}
#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_frame_interval = call_get_frame_interval,
.set_frame_interval = call_set_frame_interval,
.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_frame_desc = call_get_frame_desc,
.get_mbus_config = call_get_mbus_config,
};
static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
.s_stream = call_s_stream,
};
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;
case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval *fi = arg;
if (!(subdev_fh->client_caps &
V4L2_SUBDEV_CLIENT_CAP_INTERVAL_USES_WHICH))
fi->which = V4L2_SUBDEV_FORMAT_ACTIVE;
which = fi->which;
break;
}
case VIDIOC_SUBDEV_G_ROUTING:
case VIDIOC_SUBDEV_S_ROUTING:
which = ((struct v4l2_subdev_routing *)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;
struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
bool streams_subdev = sd->flags & V4L2_SUBDEV_FL_STREAMS;
bool client_supports_streams = subdev_fh->client_caps &
V4L2_SUBDEV_CLIENT_CAP_STREAMS;
int rval;
/*
* If the streams API is not enabled, remove V4L2_SUBDEV_CAP_STREAMS.
* Remove this when the API is no longer experimental.
*/
if (!v4l2_subdev_enable_streams_api)
streams_subdev = false;
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) |
(streams_subdev ? V4L2_SUBDEV_CAP_STREAMS : 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;
if (!client_supports_streams)
format->stream = 0;
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;
if (!client_supports_streams)
format->stream = 0;
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;
if (!client_supports_streams)
crop->stream = 0;
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;
if (!client_supports_streams)
crop->stream = 0;
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;
if (!client_supports_streams)
code->stream = 0;
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;
if (!client_supports_streams)
fse->stream = 0;
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;
if (!client_supports_streams)
fi->stream = 0;
memset(fi->reserved, 0, sizeof(fi->reserved));
return v4l2_subdev_call(sd, pad, get_frame_interval, state, fi);
}
case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval *fi = arg;
if (!client_supports_streams)
fi->stream = 0;
if (fi->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
memset(fi->reserved, 0, sizeof(fi->reserved));
return v4l2_subdev_call(sd, pad, set_frame_interval, state, fi);
}
case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
struct v4l2_subdev_frame_interval_enum *fie = arg;
if (!client_supports_streams)
fie->stream = 0;
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;
if (!client_supports_streams)
sel->stream = 0;
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;
if (!client_supports_streams)
sel->stream = 0;
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);
case VIDIOC_SUBDEV_G_ROUTING: {
struct v4l2_subdev_routing *routing = arg;
struct v4l2_subdev_krouting *krouting;
if (!v4l2_subdev_enable_streams_api)
return -ENOIOCTLCMD;
if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS))
return -ENOIOCTLCMD;
memset(routing->reserved, 0, sizeof(routing->reserved));
krouting = &state->routing;
if (routing->num_routes < krouting->num_routes) {
routing->num_routes = krouting->num_routes;
return -ENOSPC;
}
memcpy((struct v4l2_subdev_route *)(uintptr_t)routing->routes,
krouting->routes,
krouting->num_routes * sizeof(*krouting->routes));
routing->num_routes = krouting->num_routes;
return 0;
}
case VIDIOC_SUBDEV_S_ROUTING: {
struct v4l2_subdev_routing *routing = arg;
struct v4l2_subdev_route *routes =
(struct v4l2_subdev_route *)(uintptr_t)routing->routes;
struct v4l2_subdev_krouting krouting = {};
unsigned int i;
if (!v4l2_subdev_enable_streams_api)
return -ENOIOCTLCMD;
if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS))
return -ENOIOCTLCMD;
if (routing->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
memset(routing->reserved, 0, sizeof(routing->reserved));
for (i = 0; i < routing->num_routes; ++i) {
const struct v4l2_subdev_route *route = &routes[i];
const struct media_pad *pads = sd->entity.pads;
if (route->sink_stream > V4L2_SUBDEV_MAX_STREAM_ID ||
route->source_stream > V4L2_SUBDEV_MAX_STREAM_ID)
return -EINVAL;
if (route->sink_pad >= sd->entity.num_pads)
return -EINVAL;
if (!(pads[route->sink_pad].flags &
MEDIA_PAD_FL_SINK))
return -EINVAL;
if (route->source_pad >= sd->entity.num_pads)
return -EINVAL;
if (!(pads[route->source_pad].flags &
MEDIA_PAD_FL_SOURCE))
return -EINVAL;
}
krouting.num_routes = routing->num_routes;
krouting.routes = routes;
return v4l2_subdev_call(sd, pad, set_routing, state,
routing->which, &krouting);
}
case VIDIOC_SUBDEV_G_CLIENT_CAP: {
struct v4l2_subdev_client_capability *client_cap = arg;
client_cap->capabilities = subdev_fh->client_caps;
return 0;
}
case VIDIOC_SUBDEV_S_CLIENT_CAP: {
struct v4l2_subdev_client_capability *client_cap = arg;
/*
* Clear V4L2_SUBDEV_CLIENT_CAP_STREAMS if streams API is not
* enabled. Remove this when streams API is no longer
* experimental.
*/
if (!v4l2_subdev_enable_streams_api)
client_cap->capabilities &= ~V4L2_SUBDEV_CLIENT_CAP_STREAMS;
/* Filter out unsupported capabilities */
client_cap->capabilities &= (V4L2_SUBDEV_CLIENT_CAP_STREAMS |
V4L2_SUBDEV_CLIENT_CAP_INTERVAL_USES_WHICH);
subdev_fh->client_caps = client_cap->capabilities;
return 0;
}
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 (device_match_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, u32 stream,
struct v4l2_subdev_format *fmt,
bool states_locked)
{
struct v4l2_subdev_state *state;
struct v4l2_subdev *sd;
int ret;
if (!is_media_entity_v4l2_subdev(pad->entity)) {
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;
}
sd = media_entity_to_v4l2_subdev(pad->entity);
fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
fmt->pad = pad->index;
fmt->stream = stream;
if (states_locked)
state = v4l2_subdev_get_locked_active_state(sd);
else
state = v4l2_subdev_lock_and_get_active_state(sd);
ret = v4l2_subdev_call(sd, pad, get_fmt, state, fmt);
if (!states_locked && state)
v4l2_subdev_unlock_state(state);
return ret;
}
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static void __v4l2_link_validate_get_streams(struct media_pad *pad,
u64 *streams_mask,
bool states_locked)
{
struct v4l2_subdev_route *route;
struct v4l2_subdev_state *state;
struct v4l2_subdev *subdev;
subdev = media_entity_to_v4l2_subdev(pad->entity);
*streams_mask = 0;
if (states_locked)
state = v4l2_subdev_get_locked_active_state(subdev);
else
state = v4l2_subdev_lock_and_get_active_state(subdev);
if (WARN_ON(!state))
return;
for_each_active_route(&state->routing, route) {
u32 route_pad;
u32 route_stream;
if (pad->flags & MEDIA_PAD_FL_SOURCE) {
route_pad = route->source_pad;
route_stream = route->source_stream;
} else {
route_pad = route->sink_pad;
route_stream = route->sink_stream;
}
if (route_pad != pad->index)
continue;
*streams_mask |= BIT_ULL(route_stream);
}
if (!states_locked)
v4l2_subdev_unlock_state(state);
}
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static void v4l2_link_validate_get_streams(struct media_pad *pad,
u64 *streams_mask,
bool states_locked)
{
struct v4l2_subdev *subdev = media_entity_to_v4l2_subdev(pad->entity);
if (!(subdev->flags & V4L2_SUBDEV_FL_STREAMS)) {
/* Non-streams subdevs have an implicit stream 0 */
*streams_mask = BIT_ULL(0);
return;
}
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
__v4l2_link_validate_get_streams(pad, streams_mask, states_locked);
#else
/* This shouldn't happen */
*streams_mask = 0;
#endif
}
static int v4l2_subdev_link_validate_locked(struct media_link *link, bool states_locked)
{
struct v4l2_subdev *sink_subdev =
media_entity_to_v4l2_subdev(link->sink->entity);
struct device *dev = sink_subdev->entity.graph_obj.mdev->dev;
u64 source_streams_mask;
u64 sink_streams_mask;
u64 dangling_sink_streams;
u32 stream;
int ret;
dev_dbg(dev, "validating link \"%s\":%u -> \"%s\":%u\n",
link->source->entity->name, link->source->index,
link->sink->entity->name, link->sink->index);
v4l2_link_validate_get_streams(link->source, &source_streams_mask, states_locked);
v4l2_link_validate_get_streams(link->sink, &sink_streams_mask, states_locked);
/*
* It is ok to have more source streams than sink streams as extra
* source streams can just be ignored by the receiver, but having extra
* sink streams is an error as streams must have a source.
*/
dangling_sink_streams = (source_streams_mask ^ sink_streams_mask) &
sink_streams_mask;
if (dangling_sink_streams) {
dev_err(dev, "Dangling sink streams: mask %#llx\n",
dangling_sink_streams);
return -EINVAL;
}
/* Validate source and sink stream formats */
for (stream = 0; stream < sizeof(sink_streams_mask) * 8; ++stream) {
struct v4l2_subdev_format sink_fmt, source_fmt;
if (!(sink_streams_mask & BIT_ULL(stream)))
continue;
dev_dbg(dev, "validating stream \"%s\":%u:%u -> \"%s\":%u:%u\n",
link->source->entity->name, link->source->index, stream,
link->sink->entity->name, link->sink->index, stream);
ret = v4l2_subdev_link_validate_get_format(link->source, stream,
&source_fmt, states_locked);
if (ret < 0) {
dev_dbg(dev,
"Failed to get format for \"%s\":%u:%u (but that's ok)\n",
link->source->entity->name, link->source->index,
stream);
continue;
}
ret = v4l2_subdev_link_validate_get_format(link->sink, stream,
&sink_fmt, states_locked);
if (ret < 0) {
dev_dbg(dev,
"Failed to get format for \"%s\":%u:%u (but that's ok)\n",
link->sink->entity->name, link->sink->index,
stream);
continue;
}
/* TODO: add stream number to link_validate() */
ret = v4l2_subdev_call(sink_subdev, pad, link_validate, link,
&source_fmt, &sink_fmt);
if (!ret)
continue;
if (ret != -ENOIOCTLCMD)
return ret;
ret = v4l2_subdev_link_validate_default(sink_subdev, link,
&source_fmt, &sink_fmt);
if (ret)
return ret;
}
return 0;
}
int v4l2_subdev_link_validate(struct media_link *link)
{
struct v4l2_subdev *source_sd, *sink_sd;
struct v4l2_subdev_state *source_state, *sink_state;
bool states_locked;
int ret;
if (!is_media_entity_v4l2_subdev(link->sink->entity) ||
!is_media_entity_v4l2_subdev(link->source->entity)) {
pr_warn_once("%s of link '%s':%u->'%s':%u is not a V4L2 sub-device, driver bug!\n",
!is_media_entity_v4l2_subdev(link->sink->entity) ?
"sink" : "source",
link->source->entity->name, link->source->index,
link->sink->entity->name, link->sink->index);
return 0;
}
sink_sd = media_entity_to_v4l2_subdev(link->sink->entity);
source_sd = media_entity_to_v4l2_subdev(link->source->entity);
sink_state = v4l2_subdev_get_unlocked_active_state(sink_sd);
source_state = v4l2_subdev_get_unlocked_active_state(source_sd);
states_locked = sink_state && source_state;
if (states_locked) {
v4l2_subdev_lock_state(sink_state);
v4l2_subdev_lock_state(source_state);
}
ret = v4l2_subdev_link_validate_locked(link, states_locked);
if (states_locked) {
v4l2_subdev_unlock_state(sink_state);
v4l2_subdev_unlock_state(source_state);
}
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,
unsigned int pad0, unsigned int pad1)
{
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
struct v4l2_subdev_krouting *routing;
struct v4l2_subdev_state *state;
unsigned int i;
state = v4l2_subdev_lock_and_get_active_state(sd);
routing = &state->routing;
for (i = 0; i < routing->num_routes; ++i) {
struct v4l2_subdev_route *route = &routing->routes[i];
if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
continue;
if ((route->sink_pad == pad0 && route->source_pad == pad1) ||
(route->source_pad == pad0 && route->sink_pad == pad1)) {
v4l2_subdev_unlock_state(state);
return true;
}
}
v4l2_subdev_unlock_state(state);
return false;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_has_pad_interdep);
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;
state->sd = sd;
/* Drivers that support streams do not need the legacy pad config */
if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS) && sd->entity.num_pads) {
state->pads = kvcalloc(sd->entity.num_pads,
sizeof(*state->pads), GFP_KERNEL);
if (!state->pads) {
ret = -ENOMEM;
goto err;
}
}
if (sd->internal_ops && sd->internal_ops->init_state) {
/*
* There can be no race at this point, but we lock the state
* anyway to satisfy lockdep checks.
*/
v4l2_subdev_lock_state(state);
ret = sd->internal_ops->init_state(sd, state);
v4l2_subdev_unlock_state(state);
if (ret)
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);
kfree(state->routing.routes);
kvfree(state->stream_configs.configs);
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)
{
struct v4l2_async_subdev_endpoint *ase, *ase_tmp;
__v4l2_subdev_state_free(sd->active_state);
sd->active_state = NULL;
/* Uninitialised sub-device, bail out here. */
if (!sd->async_subdev_endpoint_list.next)
return;
list_for_each_entry_safe(ase, ase_tmp, &sd->async_subdev_endpoint_list,
async_subdev_endpoint_entry) {
list_del(&ase->async_subdev_endpoint_entry);
kfree(ase);
}
}
EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);
struct v4l2_mbus_framefmt *
__v4l2_subdev_state_get_format(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream)
{
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
if (WARN_ON_ONCE(!state))
return NULL;
if (state->pads) {
if (stream)
return NULL;
if (pad >= state->sd->entity.num_pads)
return NULL;
return &state->pads[pad].format;
}
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
for (i = 0; i < stream_configs->num_configs; ++i) {
if (stream_configs->configs[i].pad == pad &&
stream_configs->configs[i].stream == stream)
return &stream_configs->configs[i].fmt;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_get_format);
struct v4l2_rect *
__v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
u32 stream)
{
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
if (WARN_ON_ONCE(!state))
return NULL;
if (state->pads) {
if (stream)
return NULL;
if (pad >= state->sd->entity.num_pads)
return NULL;
return &state->pads[pad].crop;
}
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
for (i = 0; i < stream_configs->num_configs; ++i) {
if (stream_configs->configs[i].pad == pad &&
stream_configs->configs[i].stream == stream)
return &stream_configs->configs[i].crop;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_get_crop);
struct v4l2_rect *
__v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream)
{
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
if (WARN_ON_ONCE(!state))
return NULL;
if (state->pads) {
if (stream)
return NULL;
if (pad >= state->sd->entity.num_pads)
return NULL;
return &state->pads[pad].compose;
}
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
for (i = 0; i < stream_configs->num_configs; ++i) {
if (stream_configs->configs[i].pad == pad &&
stream_configs->configs[i].stream == stream)
return &stream_configs->configs[i].compose;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_get_compose);
struct v4l2_fract *
__v4l2_subdev_state_get_interval(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream)
{
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
if (WARN_ON(!state))
return NULL;
lockdep_assert_held(state->lock);
if (state->pads) {
if (stream)
return NULL;
if (pad >= state->sd->entity.num_pads)
return NULL;
return &state->pads[pad].interval;
}
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
for (i = 0; i < stream_configs->num_configs; ++i) {
if (stream_configs->configs[i].pad == pad &&
stream_configs->configs[i].stream == stream)
return &stream_configs->configs[i].interval;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_get_interval);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static int
v4l2_subdev_init_stream_configs(struct v4l2_subdev_stream_configs *stream_configs,
const struct v4l2_subdev_krouting *routing)
{
struct v4l2_subdev_stream_configs new_configs = { 0 };
struct v4l2_subdev_route *route;
u32 idx;
/* Count number of formats needed */
for_each_active_route(routing, route) {
/*
* Each route needs a format on both ends of the route.
*/
new_configs.num_configs += 2;
}
if (new_configs.num_configs) {
new_configs.configs = kvcalloc(new_configs.num_configs,
sizeof(*new_configs.configs),
GFP_KERNEL);
if (!new_configs.configs)
return -ENOMEM;
}
/*
* Fill in the 'pad' and stream' value for each item in the array from
* the routing table
*/
idx = 0;
for_each_active_route(routing, route) {
new_configs.configs[idx].pad = route->sink_pad;
new_configs.configs[idx].stream = route->sink_stream;
idx++;
new_configs.configs[idx].pad = route->source_pad;
new_configs.configs[idx].stream = route->source_stream;
idx++;
}
kvfree(stream_configs->configs);
*stream_configs = new_configs;
return 0;
}
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct v4l2_mbus_framefmt *fmt;
fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
if (!fmt)
return -EINVAL;
format->format = *fmt;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
int v4l2_subdev_get_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *fi)
{
struct v4l2_fract *interval;
interval = v4l2_subdev_state_get_interval(state, fi->pad, fi->stream);
if (!interval)
return -EINVAL;
fi->interval = *interval;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_frame_interval);
int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing)
{
struct v4l2_subdev_krouting *dst = &state->routing;
const struct v4l2_subdev_krouting *src = routing;
struct v4l2_subdev_krouting new_routing = { 0 };
size_t bytes;
int r;
if (unlikely(check_mul_overflow((size_t)src->num_routes,
sizeof(*src->routes), &bytes)))
return -EOVERFLOW;
lockdep_assert_held(state->lock);
if (src->num_routes > 0) {
new_routing.routes = kmemdup(src->routes, bytes, GFP_KERNEL);
if (!new_routing.routes)
return -ENOMEM;
}
new_routing.num_routes = src->num_routes;
r = v4l2_subdev_init_stream_configs(&state->stream_configs,
&new_routing);
if (r) {
kfree(new_routing.routes);
return r;
}
kfree(dst->routes);
*dst = new_routing;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing);
struct v4l2_subdev_route *
__v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
struct v4l2_subdev_route *route)
{
if (route)
++route;
else
route = &routing->routes[0];
for (; route < routing->routes + routing->num_routes; ++route) {
if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
continue;
return route;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_next_active_route);
int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing,
const struct v4l2_mbus_framefmt *fmt)
{
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
int ret;
ret = v4l2_subdev_set_routing(sd, state, routing);
if (ret)
return ret;
stream_configs = &state->stream_configs;
for (i = 0; i < stream_configs->num_configs; ++i)
stream_configs->configs[i].fmt = *fmt;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing_with_fmt);
int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,
u32 pad, u32 stream, u32 *other_pad,
u32 *other_stream)
{
unsigned int i;
for (i = 0; i < routing->num_routes; ++i) {
struct v4l2_subdev_route *route = &routing->routes[i];
if (route->source_pad == pad &&
route->source_stream == stream) {
if (other_pad)
*other_pad = route->sink_pad;
if (other_stream)
*other_stream = route->sink_stream;
return 0;
}
if (route->sink_pad == pad && route->sink_stream == stream) {
if (other_pad)
*other_pad = route->source_pad;
if (other_stream)
*other_stream = route->source_stream;
return 0;
}
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_routing_find_opposite_end);
struct v4l2_mbus_framefmt *
v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
u32 pad, u32 stream)
{
u32 other_pad, other_stream;
int ret;
ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
pad, stream,
&other_pad, &other_stream);
if (ret)
return NULL;
return v4l2_subdev_state_get_format(state, other_pad, other_stream);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
u32 pad0, u32 pad1, u64 *streams)
{
const struct v4l2_subdev_krouting *routing = &state->routing;
struct v4l2_subdev_route *route;
u64 streams0 = 0;
u64 streams1 = 0;
for_each_active_route(routing, route) {
if (route->sink_pad == pad0 && route->source_pad == pad1 &&
(*streams & BIT_ULL(route->sink_stream))) {
streams0 |= BIT_ULL(route->sink_stream);
streams1 |= BIT_ULL(route->source_stream);
}
if (route->source_pad == pad0 && route->sink_pad == pad1 &&
(*streams & BIT_ULL(route->source_stream))) {
streams0 |= BIT_ULL(route->source_stream);
streams1 |= BIT_ULL(route->sink_stream);
}
}
*streams = streams0;
return streams1;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_state_xlate_streams);
int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
const struct v4l2_subdev_krouting *routing,
enum v4l2_subdev_routing_restriction disallow)
{
u32 *remote_pads = NULL;
unsigned int i, j;
int ret = -EINVAL;
if (disallow & (V4L2_SUBDEV_ROUTING_NO_STREAM_MIX |
V4L2_SUBDEV_ROUTING_NO_MULTIPLEXING)) {
remote_pads = kcalloc(sd->entity.num_pads, sizeof(*remote_pads),
GFP_KERNEL);
if (!remote_pads)
return -ENOMEM;
for (i = 0; i < sd->entity.num_pads; ++i)
remote_pads[i] = U32_MAX;
}
for (i = 0; i < routing->num_routes; ++i) {
const struct v4l2_subdev_route *route = &routing->routes[i];
/* Validate the sink and source pad numbers. */
if (route->sink_pad >= sd->entity.num_pads ||
!(sd->entity.pads[route->sink_pad].flags & MEDIA_PAD_FL_SINK)) {
dev_dbg(sd->dev, "route %u sink (%u) is not a sink pad\n",
i, route->sink_pad);
goto out;
}
if (route->source_pad >= sd->entity.num_pads ||
!(sd->entity.pads[route->source_pad].flags & MEDIA_PAD_FL_SOURCE)) {
dev_dbg(sd->dev, "route %u source (%u) is not a source pad\n",
i, route->source_pad);
goto out;
}
/*
* V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX: all streams from a
* sink pad must be routed to a single source pad.
*/
if (disallow & V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX) {
if (remote_pads[route->sink_pad] != U32_MAX &&
remote_pads[route->sink_pad] != route->source_pad) {
dev_dbg(sd->dev,
"route %u attempts to mix %s streams\n",
i, "sink");
goto out;
}
}
/*
* V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX: all streams on a
* source pad must originate from a single sink pad.
*/
if (disallow & V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX) {
if (remote_pads[route->source_pad] != U32_MAX &&
remote_pads[route->source_pad] != route->sink_pad) {
dev_dbg(sd->dev,
"route %u attempts to mix %s streams\n",
i, "source");
goto out;
}
}
/*
* V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING: Pads on the sink
* side can not do stream multiplexing, i.e. there can be only
* a single stream in a sink pad.
*/
if (disallow & V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING) {
if (remote_pads[route->sink_pad] != U32_MAX) {
dev_dbg(sd->dev,
"route %u attempts to multiplex on %s pad %u\n",
i, "sink", route->sink_pad);
goto out;
}
}
/*
* V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING: Pads on the
* source side can not do stream multiplexing, i.e. there can
* be only a single stream in a source pad.
*/
if (disallow & V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING) {
if (remote_pads[route->source_pad] != U32_MAX) {
dev_dbg(sd->dev,
"route %u attempts to multiplex on %s pad %u\n",
i, "source", route->source_pad);
goto out;
}
}
if (remote_pads) {
remote_pads[route->sink_pad] = route->source_pad;
remote_pads[route->source_pad] = route->sink_pad;
}
for (j = i + 1; j < routing->num_routes; ++j) {
const struct v4l2_subdev_route *r = &routing->routes[j];
/*
* V4L2_SUBDEV_ROUTING_NO_1_TO_N: No two routes can
* originate from the same (sink) stream.
*/
if ((disallow & V4L2_SUBDEV_ROUTING_NO_1_TO_N) &&
route->sink_pad == r->sink_pad &&
route->sink_stream == r->sink_stream) {
dev_dbg(sd->dev,
"routes %u and %u originate from same sink (%u/%u)\n",
i, j, route->sink_pad,
route->sink_stream);
goto out;
}
/*
* V4L2_SUBDEV_ROUTING_NO_N_TO_1: No two routes can end
* at the same (source) stream.
*/
if ((disallow & V4L2_SUBDEV_ROUTING_NO_N_TO_1) &&
route->source_pad == r->source_pad &&
route->source_stream == r->source_stream) {
dev_dbg(sd->dev,
"routes %u and %u end at same source (%u/%u)\n",
i, j, route->source_pad,
route->source_stream);
goto out;
}
}
}
ret = 0;
out:
kfree(remote_pads);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate);
static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
unsigned int i;
int ret;
/*
* The subdev doesn't implement pad-based stream enable, fall back
* on the .s_stream() operation. This can only be done for subdevs that
* have a single source pad, as sd->enabled_streams is global to the
* subdev.
*/
if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
return -EOPNOTSUPP;
for (i = 0; i < sd->entity.num_pads; ++i) {
if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
return -EOPNOTSUPP;
}
if (sd->enabled_streams & streams_mask) {
dev_dbg(dev, "set of streams %#llx already enabled on %s:%u\n",
streams_mask, sd->entity.name, pad);
return -EALREADY;
}
/* Start streaming when the first streams are enabled. */
if (!sd->enabled_streams) {
ret = v4l2_subdev_call(sd, video, s_stream, 1);
if (ret)
return ret;
}
sd->enabled_streams |= streams_mask;
return 0;
}
int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
struct v4l2_subdev_state *state;
u64 found_streams = 0;
unsigned int i;
int ret;
/* A few basic sanity checks first. */
if (pad >= sd->entity.num_pads)
return -EINVAL;
if (!streams_mask)
return 0;
/* Fallback on .s_stream() if .enable_streams() isn't available. */
if (!sd->ops->pad || !sd->ops->pad->enable_streams)
return v4l2_subdev_enable_streams_fallback(sd, pad,
streams_mask);
state = v4l2_subdev_lock_and_get_active_state(sd);
/*
* Verify that the requested streams exist and that they are not
* already enabled.
*/
for (i = 0; i < state->stream_configs.num_configs; ++i) {
struct v4l2_subdev_stream_config *cfg =
&state->stream_configs.configs[i];
if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
continue;
found_streams |= BIT_ULL(cfg->stream);
if (cfg->enabled) {
dev_dbg(dev, "stream %u already enabled on %s:%u\n",
cfg->stream, sd->entity.name, pad);
ret = -EALREADY;
goto done;
}
}
if (found_streams != streams_mask) {
dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
streams_mask & ~found_streams, sd->entity.name, pad);
ret = -EINVAL;
goto done;
}
dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
/* Call the .enable_streams() operation. */
ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
streams_mask);
if (ret) {
dev_dbg(dev, "enable streams %u:%#llx failed: %d\n", pad,
streams_mask, ret);
goto done;
}
/* Mark the streams as enabled. */
for (i = 0; i < state->stream_configs.num_configs; ++i) {
struct v4l2_subdev_stream_config *cfg =
&state->stream_configs.configs[i];
if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
cfg->enabled = true;
}
done:
v4l2_subdev_unlock_state(state);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_enable_streams);
static int v4l2_subdev_disable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
unsigned int i;
int ret;
/*
* If the subdev doesn't implement pad-based stream enable, fall back
* on the .s_stream() operation. This can only be done for subdevs that
* have a single source pad, as sd->enabled_streams is global to the
* subdev.
*/
if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
return -EOPNOTSUPP;
for (i = 0; i < sd->entity.num_pads; ++i) {
if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
return -EOPNOTSUPP;
}
if ((sd->enabled_streams & streams_mask) != streams_mask) {
dev_dbg(dev, "set of streams %#llx already disabled on %s:%u\n",
streams_mask, sd->entity.name, pad);
return -EALREADY;
}
/* Stop streaming when the last streams are disabled. */
if (!(sd->enabled_streams & ~streams_mask)) {
ret = v4l2_subdev_call(sd, video, s_stream, 0);
if (ret)
return ret;
}
sd->enabled_streams &= ~streams_mask;
return 0;
}
int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
struct v4l2_subdev_state *state;
u64 found_streams = 0;
unsigned int i;
int ret;
/* A few basic sanity checks first. */
if (pad >= sd->entity.num_pads)
return -EINVAL;
if (!streams_mask)
return 0;
/* Fallback on .s_stream() if .disable_streams() isn't available. */
if (!sd->ops->pad || !sd->ops->pad->disable_streams)
return v4l2_subdev_disable_streams_fallback(sd, pad,
streams_mask);
state = v4l2_subdev_lock_and_get_active_state(sd);
/*
* Verify that the requested streams exist and that they are not
* already disabled.
*/
for (i = 0; i < state->stream_configs.num_configs; ++i) {
struct v4l2_subdev_stream_config *cfg =
&state->stream_configs.configs[i];
if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
continue;
found_streams |= BIT_ULL(cfg->stream);
if (!cfg->enabled) {
dev_dbg(dev, "stream %u already disabled on %s:%u\n",
cfg->stream, sd->entity.name, pad);
ret = -EALREADY;
goto done;
}
}
if (found_streams != streams_mask) {
dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
streams_mask & ~found_streams, sd->entity.name, pad);
ret = -EINVAL;
goto done;
}
dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
/* Call the .disable_streams() operation. */
ret = v4l2_subdev_call(sd, pad, disable_streams, state, pad,
streams_mask);
if (ret) {
dev_dbg(dev, "disable streams %u:%#llx failed: %d\n", pad,
streams_mask, ret);
goto done;
}
/* Mark the streams as disabled. */
for (i = 0; i < state->stream_configs.num_configs; ++i) {
struct v4l2_subdev_stream_config *cfg =
&state->stream_configs.configs[i];
if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
cfg->enabled = false;
}
done:
v4l2_subdev_unlock_state(state);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_disable_streams);
int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable)
{
struct v4l2_subdev_state *state;
struct v4l2_subdev_route *route;
struct media_pad *pad;
u64 source_mask = 0;
int pad_index = -1;
/*
* Find the source pad. This helper is meant for subdevs that have a
* single source pad, so failures shouldn't happen, but catch them
* loudly nonetheless as they indicate a driver bug.
*/
media_entity_for_each_pad(&sd->entity, pad) {
if (pad->flags & MEDIA_PAD_FL_SOURCE) {
pad_index = pad->index;
break;
}
}
if (WARN_ON(pad_index == -1))
return -EINVAL;
/*
* As there's a single source pad, just collect all the source streams.
*/
state = v4l2_subdev_lock_and_get_active_state(sd);
for_each_active_route(&state->routing, route)
source_mask |= BIT_ULL(route->source_stream);
v4l2_subdev_unlock_state(state);
if (enable)
return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
else
return v4l2_subdev_disable_streams(sd, pad_index, source_mask);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_s_stream_helper);
#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;
sd->privacy_led = NULL;
INIT_LIST_HEAD(&sd->async_subdev_endpoint_list);
#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);
int v4l2_subdev_get_privacy_led(struct v4l2_subdev *sd)
{
#if IS_REACHABLE(CONFIG_LEDS_CLASS)
sd->privacy_led = led_get(sd->dev, "privacy-led");
if (IS_ERR(sd->privacy_led) && PTR_ERR(sd->privacy_led) != -ENOENT)
return dev_err_probe(sd->dev, PTR_ERR(sd->privacy_led),
"getting privacy LED\n");
if (!IS_ERR_OR_NULL(sd->privacy_led)) {
mutex_lock(&sd->privacy_led->led_access);
led_sysfs_disable(sd->privacy_led);
led_trigger_remove(sd->privacy_led);
led_set_brightness(sd->privacy_led, 0);
mutex_unlock(&sd->privacy_led->led_access);
}
#endif
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_privacy_led);
void v4l2_subdev_put_privacy_led(struct v4l2_subdev *sd)
{
#if IS_REACHABLE(CONFIG_LEDS_CLASS)
if (!IS_ERR_OR_NULL(sd->privacy_led)) {
mutex_lock(&sd->privacy_led->led_access);
led_sysfs_enable(sd->privacy_led);
mutex_unlock(&sd->privacy_led->led_access);
led_put(sd->privacy_led);
}
#endif
}
EXPORT_SYMBOL_GPL(v4l2_subdev_put_privacy_led);
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