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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Hans Verkuil](/assets/img/avatar_default.png)
The patch that fixed string control support somehow got mangled when it was
merged in mainline: the added line ended up in the wrong place.
Fix this.
Fixes: 73278d4833
("media: v4l2-ctrls-api.c: add back dropped ctrl->is_new = 1")
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
1305 lines
34 KiB
C
1305 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* V4L2 controls framework uAPI implementation:
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*
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* Copyright (C) 2010-2021 Hans Verkuil <hverkuil-cisco@xs4all.nl>
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*/
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#define pr_fmt(fmt) "v4l2-ctrls: " fmt
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-ioctl.h>
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#include "v4l2-ctrls-priv.h"
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/* Internal temporary helper struct, one for each v4l2_ext_control */
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struct v4l2_ctrl_helper {
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/* Pointer to the control reference of the master control */
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struct v4l2_ctrl_ref *mref;
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/* The control ref corresponding to the v4l2_ext_control ID field. */
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struct v4l2_ctrl_ref *ref;
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/*
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* v4l2_ext_control index of the next control belonging to the
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* same cluster, or 0 if there isn't any.
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*/
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u32 next;
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};
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/*
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* Helper functions to copy control payload data from kernel space to
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* user space and vice versa.
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*/
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/* Helper function: copy the given control value back to the caller */
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static int ptr_to_user(struct v4l2_ext_control *c,
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struct v4l2_ctrl *ctrl,
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union v4l2_ctrl_ptr ptr)
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{
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u32 len;
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if (ctrl->is_ptr && !ctrl->is_string)
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return copy_to_user(c->ptr, ptr.p_const, c->size) ?
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-EFAULT : 0;
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_STRING:
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len = strlen(ptr.p_char);
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if (c->size < len + 1) {
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c->size = ctrl->elem_size;
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return -ENOSPC;
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}
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return copy_to_user(c->string, ptr.p_char, len + 1) ?
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-EFAULT : 0;
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case V4L2_CTRL_TYPE_INTEGER64:
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c->value64 = *ptr.p_s64;
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break;
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default:
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c->value = *ptr.p_s32;
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break;
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}
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return 0;
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}
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/* Helper function: copy the current control value back to the caller */
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static int cur_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
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{
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return ptr_to_user(c, ctrl, ctrl->p_cur);
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}
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/* Helper function: copy the new control value back to the caller */
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static int new_to_user(struct v4l2_ext_control *c,
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struct v4l2_ctrl *ctrl)
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{
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return ptr_to_user(c, ctrl, ctrl->p_new);
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}
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/* Helper function: copy the request value back to the caller */
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static int req_to_user(struct v4l2_ext_control *c,
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struct v4l2_ctrl_ref *ref)
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{
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return ptr_to_user(c, ref->ctrl, ref->p_req);
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}
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/* Helper function: copy the initial control value back to the caller */
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static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
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{
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ctrl->type_ops->init(ctrl, 0, ctrl->p_new);
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return ptr_to_user(c, ctrl, ctrl->p_new);
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}
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/* Helper function: copy the caller-provider value as the new control value */
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static int user_to_new(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
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{
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int ret;
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u32 size;
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ctrl->is_new = 0;
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if (ctrl->is_dyn_array &&
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c->size > ctrl->p_array_alloc_elems * ctrl->elem_size) {
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void *old = ctrl->p_array;
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void *tmp = kvzalloc(2 * c->size, GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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memcpy(tmp, ctrl->p_new.p, ctrl->elems * ctrl->elem_size);
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memcpy(tmp + c->size, ctrl->p_cur.p, ctrl->elems * ctrl->elem_size);
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ctrl->p_new.p = tmp;
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ctrl->p_cur.p = tmp + c->size;
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ctrl->p_array = tmp;
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ctrl->p_array_alloc_elems = c->size / ctrl->elem_size;
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kvfree(old);
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}
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if (ctrl->is_ptr && !ctrl->is_string) {
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unsigned int elems = c->size / ctrl->elem_size;
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if (copy_from_user(ctrl->p_new.p, c->ptr, c->size))
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return -EFAULT;
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ctrl->is_new = 1;
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if (ctrl->is_dyn_array)
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ctrl->new_elems = elems;
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else if (ctrl->is_array)
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ctrl->type_ops->init(ctrl, elems, ctrl->p_new);
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return 0;
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}
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_INTEGER64:
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*ctrl->p_new.p_s64 = c->value64;
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break;
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case V4L2_CTRL_TYPE_STRING:
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size = c->size;
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if (size == 0)
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return -ERANGE;
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if (size > ctrl->maximum + 1)
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size = ctrl->maximum + 1;
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ret = copy_from_user(ctrl->p_new.p_char, c->string, size) ? -EFAULT : 0;
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if (!ret) {
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char last = ctrl->p_new.p_char[size - 1];
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ctrl->p_new.p_char[size - 1] = 0;
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/*
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* If the string was longer than ctrl->maximum,
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* then return an error.
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*/
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if (strlen(ctrl->p_new.p_char) == ctrl->maximum && last)
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return -ERANGE;
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ctrl->is_new = 1;
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}
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return ret;
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default:
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*ctrl->p_new.p_s32 = c->value;
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break;
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}
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ctrl->is_new = 1;
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return 0;
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}
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/*
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* VIDIOC_G/TRY/S_EXT_CTRLS implementation
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*/
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/*
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* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
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*
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* It is not a fully atomic operation, just best-effort only. After all, if
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* multiple controls have to be set through multiple i2c writes (for example)
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* then some initial writes may succeed while others fail. Thus leaving the
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* system in an inconsistent state. The question is how much effort you are
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* willing to spend on trying to make something atomic that really isn't.
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*
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* From the point of view of an application the main requirement is that
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* when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
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* error should be returned without actually affecting any controls.
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*
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* If all the values are correct, then it is acceptable to just give up
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* in case of low-level errors.
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*
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* It is important though that the application can tell when only a partial
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* configuration was done. The way we do that is through the error_idx field
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* of struct v4l2_ext_controls: if that is equal to the count field then no
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* controls were affected. Otherwise all controls before that index were
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* successful in performing their 'get' or 'set' operation, the control at
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* the given index failed, and you don't know what happened with the controls
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* after the failed one. Since if they were part of a control cluster they
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* could have been successfully processed (if a cluster member was encountered
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* at index < error_idx), they could have failed (if a cluster member was at
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* error_idx), or they may not have been processed yet (if the first cluster
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* member appeared after error_idx).
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*
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* It is all fairly theoretical, though. In practice all you can do is to
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* bail out. If error_idx == count, then it is an application bug. If
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* error_idx < count then it is only an application bug if the error code was
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* EBUSY. That usually means that something started streaming just when you
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* tried to set the controls. In all other cases it is a driver/hardware
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* problem and all you can do is to retry or bail out.
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*
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* Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
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* never modifies controls the error_idx is just set to whatever control
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* has an invalid value.
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*/
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/*
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* Prepare for the extended g/s/try functions.
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* Find the controls in the control array and do some basic checks.
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*/
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static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
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struct v4l2_ext_controls *cs,
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struct v4l2_ctrl_helper *helpers,
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struct video_device *vdev,
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bool get)
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{
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struct v4l2_ctrl_helper *h;
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bool have_clusters = false;
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u32 i;
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for (i = 0, h = helpers; i < cs->count; i++, h++) {
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struct v4l2_ext_control *c = &cs->controls[i];
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struct v4l2_ctrl_ref *ref;
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struct v4l2_ctrl *ctrl;
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u32 id = c->id & V4L2_CTRL_ID_MASK;
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cs->error_idx = i;
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if (cs->which &&
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cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
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cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
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V4L2_CTRL_ID2WHICH(id) != cs->which) {
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dprintk(vdev,
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"invalid which 0x%x or control id 0x%x\n",
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cs->which, id);
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return -EINVAL;
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}
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/*
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* Old-style private controls are not allowed for
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* extended controls.
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*/
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if (id >= V4L2_CID_PRIVATE_BASE) {
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dprintk(vdev,
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"old-style private controls not allowed\n");
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return -EINVAL;
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}
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ref = find_ref_lock(hdl, id);
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if (!ref) {
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dprintk(vdev, "cannot find control id 0x%x\n", id);
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return -EINVAL;
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}
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h->ref = ref;
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ctrl = ref->ctrl;
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if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED) {
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dprintk(vdev, "control id 0x%x is disabled\n", id);
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return -EINVAL;
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}
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if (ctrl->cluster[0]->ncontrols > 1)
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have_clusters = true;
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if (ctrl->cluster[0] != ctrl)
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ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
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if (ctrl->is_dyn_array) {
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unsigned int max_size = ctrl->dims[0] * ctrl->elem_size;
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unsigned int tot_size = ctrl->elem_size;
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if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
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tot_size *= ref->p_req_elems;
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else
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tot_size *= ctrl->elems;
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c->size = ctrl->elem_size * (c->size / ctrl->elem_size);
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if (get) {
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if (c->size < tot_size) {
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c->size = tot_size;
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return -ENOSPC;
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}
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c->size = tot_size;
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} else {
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if (c->size > max_size) {
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c->size = max_size;
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return -ENOSPC;
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}
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if (!c->size)
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return -EFAULT;
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}
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} else if (ctrl->is_ptr && !ctrl->is_string) {
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unsigned int tot_size = ctrl->elems * ctrl->elem_size;
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if (c->size < tot_size) {
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/*
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* In the get case the application first
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* queries to obtain the size of the control.
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*/
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if (get) {
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c->size = tot_size;
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return -ENOSPC;
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}
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dprintk(vdev,
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"pointer control id 0x%x size too small, %d bytes but %d bytes needed\n",
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id, c->size, tot_size);
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return -EFAULT;
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}
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c->size = tot_size;
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}
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/* Store the ref to the master control of the cluster */
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h->mref = ref;
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/*
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* Initially set next to 0, meaning that there is no other
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* control in this helper array belonging to the same
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* cluster.
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*/
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h->next = 0;
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}
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/*
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* We are done if there were no controls that belong to a multi-
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* control cluster.
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*/
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if (!have_clusters)
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return 0;
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/*
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* The code below figures out in O(n) time which controls in the list
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* belong to the same cluster.
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*/
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/* This has to be done with the handler lock taken. */
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mutex_lock(hdl->lock);
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/* First zero the helper field in the master control references */
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for (i = 0; i < cs->count; i++)
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helpers[i].mref->helper = NULL;
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for (i = 0, h = helpers; i < cs->count; i++, h++) {
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struct v4l2_ctrl_ref *mref = h->mref;
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/*
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* If the mref->helper is set, then it points to an earlier
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* helper that belongs to the same cluster.
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*/
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if (mref->helper) {
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/*
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* Set the next field of mref->helper to the current
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* index: this means that the earlier helper now
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* points to the next helper in the same cluster.
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*/
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mref->helper->next = i;
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/*
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* mref should be set only for the first helper in the
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* cluster, clear the others.
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*/
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h->mref = NULL;
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}
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/* Point the mref helper to the current helper struct. */
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mref->helper = h;
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}
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mutex_unlock(hdl->lock);
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return 0;
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}
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/*
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* Handles the corner case where cs->count == 0. It checks whether the
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* specified control class exists. If that class ID is 0, then it checks
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* whether there are any controls at all.
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*/
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static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
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{
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if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
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which == V4L2_CTRL_WHICH_REQUEST_VAL)
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return 0;
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return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
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}
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/*
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* Get extended controls. Allocates the helpers array if needed.
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*
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* Note that v4l2_g_ext_ctrls_common() with 'which' set to
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* V4L2_CTRL_WHICH_REQUEST_VAL is only called if the request was
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* completed, and in that case p_req_valid is true for all controls.
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*/
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int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
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struct v4l2_ext_controls *cs,
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struct video_device *vdev)
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{
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struct v4l2_ctrl_helper helper[4];
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struct v4l2_ctrl_helper *helpers = helper;
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int ret;
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int i, j;
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bool is_default, is_request;
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is_default = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
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is_request = (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL);
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cs->error_idx = cs->count;
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cs->which = V4L2_CTRL_ID2WHICH(cs->which);
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if (!hdl)
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return -EINVAL;
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if (cs->count == 0)
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return class_check(hdl, cs->which);
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if (cs->count > ARRAY_SIZE(helper)) {
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helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
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GFP_KERNEL);
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if (!helpers)
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return -ENOMEM;
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}
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ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, true);
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cs->error_idx = cs->count;
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for (i = 0; !ret && i < cs->count; i++)
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if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
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ret = -EACCES;
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for (i = 0; !ret && i < cs->count; i++) {
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struct v4l2_ctrl *master;
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bool is_volatile = false;
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u32 idx = i;
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if (!helpers[i].mref)
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continue;
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master = helpers[i].mref->ctrl;
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cs->error_idx = i;
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v4l2_ctrl_lock(master);
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/*
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* g_volatile_ctrl will update the new control values.
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* This makes no sense for V4L2_CTRL_WHICH_DEF_VAL and
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* V4L2_CTRL_WHICH_REQUEST_VAL. In the case of requests
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* it is v4l2_ctrl_request_complete() that copies the
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* volatile controls at the time of request completion
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* to the request, so you don't want to do that again.
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*/
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if (!is_default && !is_request &&
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((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
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(master->has_volatiles && !is_cur_manual(master)))) {
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for (j = 0; j < master->ncontrols; j++)
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cur_to_new(master->cluster[j]);
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ret = call_op(master, g_volatile_ctrl);
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is_volatile = true;
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}
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if (ret) {
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v4l2_ctrl_unlock(master);
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break;
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}
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/*
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* Copy the default value (if is_default is true), the
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* request value (if is_request is true and p_req is valid),
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* the new volatile value (if is_volatile is true) or the
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* current value.
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*/
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do {
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struct v4l2_ctrl_ref *ref = helpers[idx].ref;
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if (is_default)
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ret = def_to_user(cs->controls + idx, ref->ctrl);
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else if (is_request && ref->p_req_array_enomem)
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ret = -ENOMEM;
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else if (is_request && ref->p_req_valid)
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ret = req_to_user(cs->controls + idx, ref);
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else if (is_volatile)
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ret = new_to_user(cs->controls + idx, ref->ctrl);
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else
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ret = cur_to_user(cs->controls + idx, ref->ctrl);
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idx = helpers[idx].next;
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} while (!ret && idx);
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|
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v4l2_ctrl_unlock(master);
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}
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|
|
if (cs->count > ARRAY_SIZE(helper))
|
|
kvfree(helpers);
|
|
return ret;
|
|
}
|
|
|
|
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
|
|
struct media_device *mdev, struct v4l2_ext_controls *cs)
|
|
{
|
|
if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
|
|
return v4l2_g_ext_ctrls_request(hdl, vdev, mdev, cs);
|
|
|
|
return v4l2_g_ext_ctrls_common(hdl, cs, vdev);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_g_ext_ctrls);
|
|
|
|
/* Validate a new control */
|
|
static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
|
|
{
|
|
return ctrl->type_ops->validate(ctrl, p_new);
|
|
}
|
|
|
|
/* Validate controls. */
|
|
static int validate_ctrls(struct v4l2_ext_controls *cs,
|
|
struct v4l2_ctrl_helper *helpers,
|
|
struct video_device *vdev,
|
|
bool set)
|
|
{
|
|
unsigned int i;
|
|
int ret = 0;
|
|
|
|
cs->error_idx = cs->count;
|
|
for (i = 0; i < cs->count; i++) {
|
|
struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
|
|
union v4l2_ctrl_ptr p_new;
|
|
|
|
cs->error_idx = i;
|
|
|
|
if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) {
|
|
dprintk(vdev,
|
|
"control id 0x%x is read-only\n",
|
|
ctrl->id);
|
|
return -EACCES;
|
|
}
|
|
/*
|
|
* This test is also done in try_set_control_cluster() which
|
|
* is called in atomic context, so that has the final say,
|
|
* but it makes sense to do an up-front check as well. Once
|
|
* an error occurs in try_set_control_cluster() some other
|
|
* controls may have been set already and we want to do a
|
|
* best-effort to avoid that.
|
|
*/
|
|
if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) {
|
|
dprintk(vdev,
|
|
"control id 0x%x is grabbed, cannot set\n",
|
|
ctrl->id);
|
|
return -EBUSY;
|
|
}
|
|
/*
|
|
* Skip validation for now if the payload needs to be copied
|
|
* from userspace into kernelspace. We'll validate those later.
|
|
*/
|
|
if (ctrl->is_ptr)
|
|
continue;
|
|
if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
|
|
p_new.p_s64 = &cs->controls[i].value64;
|
|
else
|
|
p_new.p_s32 = &cs->controls[i].value;
|
|
ret = validate_new(ctrl, p_new);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Try or try-and-set controls */
|
|
int try_set_ext_ctrls_common(struct v4l2_fh *fh,
|
|
struct v4l2_ctrl_handler *hdl,
|
|
struct v4l2_ext_controls *cs,
|
|
struct video_device *vdev, bool set)
|
|
{
|
|
struct v4l2_ctrl_helper helper[4];
|
|
struct v4l2_ctrl_helper *helpers = helper;
|
|
unsigned int i, j;
|
|
int ret;
|
|
|
|
cs->error_idx = cs->count;
|
|
|
|
/* Default value cannot be changed */
|
|
if (cs->which == V4L2_CTRL_WHICH_DEF_VAL) {
|
|
dprintk(vdev, "%s: cannot change default value\n",
|
|
video_device_node_name(vdev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
cs->which = V4L2_CTRL_ID2WHICH(cs->which);
|
|
|
|
if (!hdl) {
|
|
dprintk(vdev, "%s: invalid null control handler\n",
|
|
video_device_node_name(vdev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (cs->count == 0)
|
|
return class_check(hdl, cs->which);
|
|
|
|
if (cs->count > ARRAY_SIZE(helper)) {
|
|
helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
|
|
GFP_KERNEL);
|
|
if (!helpers)
|
|
return -ENOMEM;
|
|
}
|
|
ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, false);
|
|
if (!ret)
|
|
ret = validate_ctrls(cs, helpers, vdev, set);
|
|
if (ret && set)
|
|
cs->error_idx = cs->count;
|
|
for (i = 0; !ret && i < cs->count; i++) {
|
|
struct v4l2_ctrl *master;
|
|
u32 idx = i;
|
|
|
|
if (!helpers[i].mref)
|
|
continue;
|
|
|
|
cs->error_idx = i;
|
|
master = helpers[i].mref->ctrl;
|
|
v4l2_ctrl_lock(master);
|
|
|
|
/* Reset the 'is_new' flags of the cluster */
|
|
for (j = 0; j < master->ncontrols; j++)
|
|
if (master->cluster[j])
|
|
master->cluster[j]->is_new = 0;
|
|
|
|
/*
|
|
* For volatile autoclusters that are currently in auto mode
|
|
* we need to discover if it will be set to manual mode.
|
|
* If so, then we have to copy the current volatile values
|
|
* first since those will become the new manual values (which
|
|
* may be overwritten by explicit new values from this set
|
|
* of controls).
|
|
*/
|
|
if (master->is_auto && master->has_volatiles &&
|
|
!is_cur_manual(master)) {
|
|
/* Pick an initial non-manual value */
|
|
s32 new_auto_val = master->manual_mode_value + 1;
|
|
u32 tmp_idx = idx;
|
|
|
|
do {
|
|
/*
|
|
* Check if the auto control is part of the
|
|
* list, and remember the new value.
|
|
*/
|
|
if (helpers[tmp_idx].ref->ctrl == master)
|
|
new_auto_val = cs->controls[tmp_idx].value;
|
|
tmp_idx = helpers[tmp_idx].next;
|
|
} while (tmp_idx);
|
|
/*
|
|
* If the new value == the manual value, then copy
|
|
* the current volatile values.
|
|
*/
|
|
if (new_auto_val == master->manual_mode_value)
|
|
update_from_auto_cluster(master);
|
|
}
|
|
|
|
/*
|
|
* Copy the new caller-supplied control values.
|
|
* user_to_new() sets 'is_new' to 1.
|
|
*/
|
|
do {
|
|
struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
|
|
|
|
ret = user_to_new(cs->controls + idx, ctrl);
|
|
if (!ret && ctrl->is_ptr) {
|
|
ret = validate_new(ctrl, ctrl->p_new);
|
|
if (ret)
|
|
dprintk(vdev,
|
|
"failed to validate control %s (%d)\n",
|
|
v4l2_ctrl_get_name(ctrl->id), ret);
|
|
}
|
|
idx = helpers[idx].next;
|
|
} while (!ret && idx);
|
|
|
|
if (!ret)
|
|
ret = try_or_set_cluster(fh, master,
|
|
!hdl->req_obj.req && set, 0);
|
|
if (!ret && hdl->req_obj.req && set) {
|
|
for (j = 0; j < master->ncontrols; j++) {
|
|
struct v4l2_ctrl_ref *ref =
|
|
find_ref(hdl, master->cluster[j]->id);
|
|
|
|
new_to_req(ref);
|
|
}
|
|
}
|
|
|
|
/* Copy the new values back to userspace. */
|
|
if (!ret) {
|
|
idx = i;
|
|
do {
|
|
ret = new_to_user(cs->controls + idx,
|
|
helpers[idx].ref->ctrl);
|
|
idx = helpers[idx].next;
|
|
} while (!ret && idx);
|
|
}
|
|
v4l2_ctrl_unlock(master);
|
|
}
|
|
|
|
if (cs->count > ARRAY_SIZE(helper))
|
|
kvfree(helpers);
|
|
return ret;
|
|
}
|
|
|
|
static int try_set_ext_ctrls(struct v4l2_fh *fh,
|
|
struct v4l2_ctrl_handler *hdl,
|
|
struct video_device *vdev,
|
|
struct media_device *mdev,
|
|
struct v4l2_ext_controls *cs, bool set)
|
|
{
|
|
int ret;
|
|
|
|
if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
|
|
return try_set_ext_ctrls_request(fh, hdl, vdev, mdev, cs, set);
|
|
|
|
ret = try_set_ext_ctrls_common(fh, hdl, cs, vdev, set);
|
|
if (ret)
|
|
dprintk(vdev,
|
|
"%s: try_set_ext_ctrls_common failed (%d)\n",
|
|
video_device_node_name(vdev), ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
|
|
struct video_device *vdev,
|
|
struct media_device *mdev,
|
|
struct v4l2_ext_controls *cs)
|
|
{
|
|
return try_set_ext_ctrls(NULL, hdl, vdev, mdev, cs, false);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_try_ext_ctrls);
|
|
|
|
int v4l2_s_ext_ctrls(struct v4l2_fh *fh,
|
|
struct v4l2_ctrl_handler *hdl,
|
|
struct video_device *vdev,
|
|
struct media_device *mdev,
|
|
struct v4l2_ext_controls *cs)
|
|
{
|
|
return try_set_ext_ctrls(fh, hdl, vdev, mdev, cs, true);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_s_ext_ctrls);
|
|
|
|
/*
|
|
* VIDIOC_G/S_CTRL implementation
|
|
*/
|
|
|
|
/* Helper function to get a single control */
|
|
static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
|
|
{
|
|
struct v4l2_ctrl *master = ctrl->cluster[0];
|
|
int ret = 0;
|
|
int i;
|
|
|
|
/* Compound controls are not supported. The new_to_user() and
|
|
* cur_to_user() calls below would need to be modified not to access
|
|
* userspace memory when called from get_ctrl().
|
|
*/
|
|
if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
|
|
return -EINVAL;
|
|
|
|
if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
|
|
return -EACCES;
|
|
|
|
v4l2_ctrl_lock(master);
|
|
/* g_volatile_ctrl will update the current control values */
|
|
if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
|
|
for (i = 0; i < master->ncontrols; i++)
|
|
cur_to_new(master->cluster[i]);
|
|
ret = call_op(master, g_volatile_ctrl);
|
|
new_to_user(c, ctrl);
|
|
} else {
|
|
cur_to_user(c, ctrl);
|
|
}
|
|
v4l2_ctrl_unlock(master);
|
|
return ret;
|
|
}
|
|
|
|
int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
|
|
{
|
|
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
|
|
struct v4l2_ext_control c;
|
|
int ret;
|
|
|
|
if (!ctrl || !ctrl->is_int)
|
|
return -EINVAL;
|
|
ret = get_ctrl(ctrl, &c);
|
|
control->value = c.value;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_g_ctrl);
|
|
|
|
/* Helper function for VIDIOC_S_CTRL compatibility */
|
|
static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
|
|
{
|
|
struct v4l2_ctrl *master = ctrl->cluster[0];
|
|
int ret;
|
|
int i;
|
|
|
|
/* Reset the 'is_new' flags of the cluster */
|
|
for (i = 0; i < master->ncontrols; i++)
|
|
if (master->cluster[i])
|
|
master->cluster[i]->is_new = 0;
|
|
|
|
ret = validate_new(ctrl, ctrl->p_new);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* For autoclusters with volatiles that are switched from auto to
|
|
* manual mode we have to update the current volatile values since
|
|
* those will become the initial manual values after such a switch.
|
|
*/
|
|
if (master->is_auto && master->has_volatiles && ctrl == master &&
|
|
!is_cur_manual(master) && ctrl->val == master->manual_mode_value)
|
|
update_from_auto_cluster(master);
|
|
|
|
ctrl->is_new = 1;
|
|
return try_or_set_cluster(fh, master, true, ch_flags);
|
|
}
|
|
|
|
/* Helper function for VIDIOC_S_CTRL compatibility */
|
|
static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
|
|
struct v4l2_ext_control *c)
|
|
{
|
|
int ret;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
user_to_new(c, ctrl);
|
|
ret = set_ctrl(fh, ctrl, 0);
|
|
if (!ret)
|
|
cur_to_user(c, ctrl);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
return ret;
|
|
}
|
|
|
|
int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
|
struct v4l2_control *control)
|
|
{
|
|
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
|
|
struct v4l2_ext_control c = { control->id };
|
|
int ret;
|
|
|
|
if (!ctrl || !ctrl->is_int)
|
|
return -EINVAL;
|
|
|
|
if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
|
|
return -EACCES;
|
|
|
|
c.value = control->value;
|
|
ret = set_ctrl_lock(fh, ctrl, &c);
|
|
control->value = c.value;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_s_ctrl);
|
|
|
|
/*
|
|
* Helper functions for drivers to get/set controls.
|
|
*/
|
|
|
|
s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
|
|
{
|
|
struct v4l2_ext_control c;
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(!ctrl->is_int))
|
|
return 0;
|
|
c.value = 0;
|
|
get_ctrl(ctrl, &c);
|
|
return c.value;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
|
|
|
|
s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
|
|
{
|
|
struct v4l2_ext_control c;
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
|
|
return 0;
|
|
c.value64 = 0;
|
|
get_ctrl(ctrl, &c);
|
|
return c.value64;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
|
|
|
|
int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
|
|
{
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(!ctrl->is_int))
|
|
return -EINVAL;
|
|
ctrl->val = val;
|
|
return set_ctrl(NULL, ctrl, 0);
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
|
|
|
|
int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
|
|
{
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
|
|
return -EINVAL;
|
|
*ctrl->p_new.p_s64 = val;
|
|
return set_ctrl(NULL, ctrl, 0);
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
|
|
|
|
int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
|
|
{
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING))
|
|
return -EINVAL;
|
|
strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
|
|
return set_ctrl(NULL, ctrl, 0);
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
|
|
|
|
int __v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl,
|
|
enum v4l2_ctrl_type type, const void *p)
|
|
{
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
/* It's a driver bug if this happens. */
|
|
if (WARN_ON(ctrl->type != type))
|
|
return -EINVAL;
|
|
/* Setting dynamic arrays is not (yet?) supported. */
|
|
if (WARN_ON(ctrl->is_dyn_array))
|
|
return -EINVAL;
|
|
memcpy(ctrl->p_new.p, p, ctrl->elems * ctrl->elem_size);
|
|
return set_ctrl(NULL, ctrl, 0);
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_compound);
|
|
|
|
/*
|
|
* Modify the range of a control.
|
|
*/
|
|
int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|
s64 min, s64 max, u64 step, s64 def)
|
|
{
|
|
bool value_changed;
|
|
bool range_changed = false;
|
|
int ret;
|
|
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
switch (ctrl->type) {
|
|
case V4L2_CTRL_TYPE_INTEGER:
|
|
case V4L2_CTRL_TYPE_INTEGER64:
|
|
case V4L2_CTRL_TYPE_BOOLEAN:
|
|
case V4L2_CTRL_TYPE_MENU:
|
|
case V4L2_CTRL_TYPE_INTEGER_MENU:
|
|
case V4L2_CTRL_TYPE_BITMASK:
|
|
case V4L2_CTRL_TYPE_U8:
|
|
case V4L2_CTRL_TYPE_U16:
|
|
case V4L2_CTRL_TYPE_U32:
|
|
if (ctrl->is_array)
|
|
return -EINVAL;
|
|
ret = check_range(ctrl->type, min, max, step, def);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (ctrl->minimum != min || ctrl->maximum != max ||
|
|
ctrl->step != step || ctrl->default_value != def) {
|
|
range_changed = true;
|
|
ctrl->minimum = min;
|
|
ctrl->maximum = max;
|
|
ctrl->step = step;
|
|
ctrl->default_value = def;
|
|
}
|
|
cur_to_new(ctrl);
|
|
if (validate_new(ctrl, ctrl->p_new)) {
|
|
if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
|
|
*ctrl->p_new.p_s64 = def;
|
|
else
|
|
*ctrl->p_new.p_s32 = def;
|
|
}
|
|
|
|
if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
|
|
value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
|
|
else
|
|
value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
|
|
if (value_changed)
|
|
ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
|
|
else if (range_changed)
|
|
send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
|
|
|
|
int __v4l2_ctrl_modify_dimensions(struct v4l2_ctrl *ctrl,
|
|
u32 dims[V4L2_CTRL_MAX_DIMS])
|
|
{
|
|
unsigned int elems = 1;
|
|
unsigned int i;
|
|
void *p_array;
|
|
|
|
lockdep_assert_held(ctrl->handler->lock);
|
|
|
|
if (!ctrl->is_array || ctrl->is_dyn_array)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ctrl->nr_of_dims; i++)
|
|
elems *= dims[i];
|
|
if (elems == 0)
|
|
return -EINVAL;
|
|
p_array = kvzalloc(2 * elems * ctrl->elem_size, GFP_KERNEL);
|
|
if (!p_array)
|
|
return -ENOMEM;
|
|
kvfree(ctrl->p_array);
|
|
ctrl->p_array_alloc_elems = elems;
|
|
ctrl->elems = elems;
|
|
ctrl->new_elems = elems;
|
|
ctrl->p_array = p_array;
|
|
ctrl->p_new.p = p_array;
|
|
ctrl->p_cur.p = p_array + elems * ctrl->elem_size;
|
|
for (i = 0; i < ctrl->nr_of_dims; i++)
|
|
ctrl->dims[i] = dims[i];
|
|
ctrl->type_ops->init(ctrl, 0, ctrl->p_cur);
|
|
cur_to_new(ctrl);
|
|
send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
|
|
V4L2_EVENT_CTRL_CH_DIMENSIONS);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__v4l2_ctrl_modify_dimensions);
|
|
|
|
/* Implement VIDIOC_QUERY_EXT_CTRL */
|
|
int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
|
|
{
|
|
const unsigned int next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
|
|
u32 id = qc->id & V4L2_CTRL_ID_MASK;
|
|
struct v4l2_ctrl_ref *ref;
|
|
struct v4l2_ctrl *ctrl;
|
|
|
|
if (!hdl)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(hdl->lock);
|
|
|
|
/* Try to find it */
|
|
ref = find_ref(hdl, id);
|
|
|
|
if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
|
|
bool is_compound;
|
|
/* Match any control that is not hidden */
|
|
unsigned int mask = 1;
|
|
bool match = false;
|
|
|
|
if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
|
|
/* Match any hidden control */
|
|
match = true;
|
|
} else if ((qc->id & next_flags) == next_flags) {
|
|
/* Match any control, compound or not */
|
|
mask = 0;
|
|
}
|
|
|
|
/* Find the next control with ID > qc->id */
|
|
|
|
/* Did we reach the end of the control list? */
|
|
if (id >= node2id(hdl->ctrl_refs.prev)) {
|
|
ref = NULL; /* Yes, so there is no next control */
|
|
} else if (ref) {
|
|
/*
|
|
* We found a control with the given ID, so just get
|
|
* the next valid one in the list.
|
|
*/
|
|
list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
|
|
is_compound = ref->ctrl->is_array ||
|
|
ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
|
|
if (id < ref->ctrl->id &&
|
|
(is_compound & mask) == match)
|
|
break;
|
|
}
|
|
if (&ref->node == &hdl->ctrl_refs)
|
|
ref = NULL;
|
|
} else {
|
|
/*
|
|
* No control with the given ID exists, so start
|
|
* searching for the next largest ID. We know there
|
|
* is one, otherwise the first 'if' above would have
|
|
* been true.
|
|
*/
|
|
list_for_each_entry(ref, &hdl->ctrl_refs, node) {
|
|
is_compound = ref->ctrl->is_array ||
|
|
ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
|
|
if (id < ref->ctrl->id &&
|
|
(is_compound & mask) == match)
|
|
break;
|
|
}
|
|
if (&ref->node == &hdl->ctrl_refs)
|
|
ref = NULL;
|
|
}
|
|
}
|
|
mutex_unlock(hdl->lock);
|
|
|
|
if (!ref)
|
|
return -EINVAL;
|
|
|
|
ctrl = ref->ctrl;
|
|
memset(qc, 0, sizeof(*qc));
|
|
if (id >= V4L2_CID_PRIVATE_BASE)
|
|
qc->id = id;
|
|
else
|
|
qc->id = ctrl->id;
|
|
strscpy(qc->name, ctrl->name, sizeof(qc->name));
|
|
qc->flags = user_flags(ctrl);
|
|
qc->type = ctrl->type;
|
|
qc->elem_size = ctrl->elem_size;
|
|
qc->elems = ctrl->elems;
|
|
qc->nr_of_dims = ctrl->nr_of_dims;
|
|
memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
|
|
qc->minimum = ctrl->minimum;
|
|
qc->maximum = ctrl->maximum;
|
|
qc->default_value = ctrl->default_value;
|
|
if (ctrl->type == V4L2_CTRL_TYPE_MENU ||
|
|
ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
|
|
qc->step = 1;
|
|
else
|
|
qc->step = ctrl->step;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_query_ext_ctrl);
|
|
|
|
/* Implement VIDIOC_QUERYCTRL */
|
|
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
|
|
{
|
|
struct v4l2_query_ext_ctrl qec = { qc->id };
|
|
int rc;
|
|
|
|
rc = v4l2_query_ext_ctrl(hdl, &qec);
|
|
if (rc)
|
|
return rc;
|
|
|
|
qc->id = qec.id;
|
|
qc->type = qec.type;
|
|
qc->flags = qec.flags;
|
|
strscpy(qc->name, qec.name, sizeof(qc->name));
|
|
switch (qc->type) {
|
|
case V4L2_CTRL_TYPE_INTEGER:
|
|
case V4L2_CTRL_TYPE_BOOLEAN:
|
|
case V4L2_CTRL_TYPE_MENU:
|
|
case V4L2_CTRL_TYPE_INTEGER_MENU:
|
|
case V4L2_CTRL_TYPE_STRING:
|
|
case V4L2_CTRL_TYPE_BITMASK:
|
|
qc->minimum = qec.minimum;
|
|
qc->maximum = qec.maximum;
|
|
qc->step = qec.step;
|
|
qc->default_value = qec.default_value;
|
|
break;
|
|
default:
|
|
qc->minimum = 0;
|
|
qc->maximum = 0;
|
|
qc->step = 0;
|
|
qc->default_value = 0;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_queryctrl);
|
|
|
|
/* Implement VIDIOC_QUERYMENU */
|
|
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
|
|
{
|
|
struct v4l2_ctrl *ctrl;
|
|
u32 i = qm->index;
|
|
|
|
ctrl = v4l2_ctrl_find(hdl, qm->id);
|
|
if (!ctrl)
|
|
return -EINVAL;
|
|
|
|
qm->reserved = 0;
|
|
/* Sanity checks */
|
|
switch (ctrl->type) {
|
|
case V4L2_CTRL_TYPE_MENU:
|
|
if (!ctrl->qmenu)
|
|
return -EINVAL;
|
|
break;
|
|
case V4L2_CTRL_TYPE_INTEGER_MENU:
|
|
if (!ctrl->qmenu_int)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (i < ctrl->minimum || i > ctrl->maximum)
|
|
return -EINVAL;
|
|
|
|
/* Use mask to see if this menu item should be skipped */
|
|
if (ctrl->menu_skip_mask & (1ULL << i))
|
|
return -EINVAL;
|
|
/* Empty menu items should also be skipped */
|
|
if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
|
|
if (!ctrl->qmenu[i] || ctrl->qmenu[i][0] == '\0')
|
|
return -EINVAL;
|
|
strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
|
|
} else {
|
|
qm->value = ctrl->qmenu_int[i];
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_querymenu);
|
|
|
|
/*
|
|
* VIDIOC_LOG_STATUS helpers
|
|
*/
|
|
|
|
int v4l2_ctrl_log_status(struct file *file, void *fh)
|
|
{
|
|
struct video_device *vfd = video_devdata(file);
|
|
struct v4l2_fh *vfh = file->private_data;
|
|
|
|
if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
|
|
v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
|
|
vfd->v4l2_dev->name);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_log_status);
|
|
|
|
int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
|
|
{
|
|
v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
|
|
|
|
/*
|
|
* VIDIOC_(UN)SUBSCRIBE_EVENT implementation
|
|
*/
|
|
|
|
static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev,
|
|
unsigned int elems)
|
|
{
|
|
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
|
|
|
|
if (!ctrl)
|
|
return -EINVAL;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
list_add_tail(&sev->node, &ctrl->ev_subs);
|
|
if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
|
|
(sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL))
|
|
send_initial_event(sev->fh, ctrl);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
return 0;
|
|
}
|
|
|
|
static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
|
|
{
|
|
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
|
|
|
|
if (!ctrl)
|
|
return;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
list_del(&sev->node);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
}
|
|
|
|
void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
|
|
{
|
|
u32 old_changes = old->u.ctrl.changes;
|
|
|
|
old->u.ctrl = new->u.ctrl;
|
|
old->u.ctrl.changes |= old_changes;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_replace);
|
|
|
|
void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
|
|
{
|
|
new->u.ctrl.changes |= old->u.ctrl.changes;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_merge);
|
|
|
|
const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
|
|
.add = v4l2_ctrl_add_event,
|
|
.del = v4l2_ctrl_del_event,
|
|
.replace = v4l2_ctrl_replace,
|
|
.merge = v4l2_ctrl_merge,
|
|
};
|
|
EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
|
|
|
|
int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
|
|
const struct v4l2_event_subscription *sub)
|
|
{
|
|
if (sub->type == V4L2_EVENT_CTRL)
|
|
return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
|
|
|
|
int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
|
|
struct v4l2_event_subscription *sub)
|
|
{
|
|
if (!sd->ctrl_handler)
|
|
return -EINVAL;
|
|
return v4l2_ctrl_subscribe_event(fh, sub);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
|
|
|
|
/*
|
|
* poll helper
|
|
*/
|
|
__poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
|
|
{
|
|
struct v4l2_fh *fh = file->private_data;
|
|
|
|
poll_wait(file, &fh->wait, wait);
|
|
if (v4l2_event_pending(fh))
|
|
return EPOLLPRI;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_ctrl_poll);
|