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Date: Tue, 20 Feb 2018 13:44:19 +0900
From: Alexandre Courbot <acourbot@...omium.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hverkuil@...all.nl>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Pawel Osciak <posciak@...omium.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Tomasz Figa <tfiga@...omium.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Gustavo Padovan <gustavo.padovan@...labora.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Alexandre Courbot <acourbot@...omium.org>
Subject: [RFCv4 15/21] v4l2-ctrls: support requests in EXT_CTRLS ioctls
Read and use the request_fd field of struct v4l2_ext_controls to apply
VIDIOC_G_EXT_CTRLS or VIDIOC_S_EXT_CTRLS to a request when asked by
userspace.
Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
---
drivers/media/platform/omap3isp/ispvideo.c | 2 +-
drivers/media/v4l2-core/v4l2-ctrls.c | 98 +++++++++++++++++++++-
drivers/media/v4l2-core/v4l2-ioctl.c | 6 +-
drivers/media/v4l2-core/v4l2-subdev.c | 2 +-
include/media/v4l2-ctrls.h | 3 +-
5 files changed, 102 insertions(+), 9 deletions(-)
diff --git a/drivers/media/platform/omap3isp/ispvideo.c b/drivers/media/platform/omap3isp/ispvideo.c
index a751c89a3ea8..3976cd9ac2f2 100644
--- a/drivers/media/platform/omap3isp/ispvideo.c
+++ b/drivers/media/platform/omap3isp/ispvideo.c
@@ -1028,7 +1028,7 @@ static int isp_video_check_external_subdevs(struct isp_video *video,
ctrls.count = 1;
ctrls.controls = &ctrl;
- ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &ctrls);
+ ret = v4l2_g_ext_ctrls(NULL, pipe->external->ctrl_handler, &ctrls);
if (ret < 0) {
dev_warn(isp->dev, "no pixel rate control in subdev %s\n",
pipe->external->name);
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 7a81aa5959c3..d7b1aeb32470 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -27,6 +27,7 @@
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-dev.h>
+#include <media/v4l2-request.h>
#define has_op(master, op) \
(master->ops && master->ops->op)
@@ -2959,9 +2960,44 @@ static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
}
+#if IS_ENABLED(CONFIG_MEDIA_REQUEST_API)
+static struct media_request *
+get_handler_for_request(struct v4l2_fh *fh, struct v4l2_ext_controls *cs,
+ struct v4l2_ctrl_handler **hdl)
+{
+ struct media_request *req;
+ struct v4l2_request_entity_data *data;
+
+ if (!fh || !fh->entity)
+ return ERR_PTR(-EINVAL);
+
+ req = media_request_get_from_fd(cs->request_fd);
+ if (!req)
+ return ERR_PTR(-EINVAL);
+
+ data = to_v4l2_entity_data(media_request_get_entity_data(req,
+ fh->entity));
+ if (IS_ERR(data)) {
+ media_request_put(req);
+ return (void *)data;
+ }
+
+ *hdl = &data->ctrls;
+
+ return req;
+}
+#else
+static struct media_request *
+get_handler_for_request(struct v4l2_fh *fh, struct v4l2_ext_controls *cs,
+ struct v4l2_ctrl_handler **hdl)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
+#endif
/* Get extended controls. Allocates the helpers array if needed. */
-int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+int __v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ext_controls *cs)
{
struct v4l2_ctrl_helper helper[4];
struct v4l2_ctrl_helper *helpers = helper;
@@ -3042,6 +3078,30 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
kvfree(helpers);
return ret;
}
+
+int v4l2_g_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ext_controls *cs)
+{
+ struct media_request *req = NULL;
+ int ret;
+
+ if (cs->request_fd > 0) {
+ req = get_handler_for_request(fh, cs, &hdl);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ media_request_lock(req);
+ }
+
+ ret = __v4l2_g_ext_ctrls(hdl, cs);
+
+ if (req) {
+ media_request_unlock(req);
+ media_request_put(req);
+ }
+
+ return ret;
+}
EXPORT_SYMBOL(v4l2_g_ext_ctrls);
/* Helper function to get a single control */
@@ -3217,9 +3277,9 @@ static void update_from_auto_cluster(struct v4l2_ctrl *master)
}
/* Try or try-and-set controls */
-static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
- struct v4l2_ext_controls *cs,
- bool set)
+static int __try_set_ext_ctrls(struct v4l2_fh *fh,
+ struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ext_controls *cs, bool set)
{
struct v4l2_ctrl_helper helper[4];
struct v4l2_ctrl_helper *helpers = helper;
@@ -3332,6 +3392,36 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
return ret;
}
+static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ext_controls *cs, bool set)
+{
+ struct media_request *req = NULL;
+ int ret;
+
+ if (cs->request_fd > 0) {
+ req = get_handler_for_request(fh, cs, &hdl);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ media_request_lock(req);
+
+ if (media_request_get_state(req) != MEDIA_REQUEST_STATE_IDLE) {
+ ret = -EBUSY;
+ goto out;
+ }
+ }
+
+ ret = __try_set_ext_ctrls(fh, hdl, cs, set);
+
+out:
+ if (req) {
+ media_request_unlock(req);
+ media_request_put(req);
+ }
+
+ return ret;
+}
+
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
{
return try_set_ext_ctrls(NULL, hdl, cs, false);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 2f40ac0cdf6e..ab4968ea443f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2077,10 +2077,11 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
p->error_idx = p->count;
+
if (vfh && vfh->ctrl_handler)
- return v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
+ return v4l2_g_ext_ctrls(vfh, vfh->ctrl_handler, p);
if (vfd->ctrl_handler)
- return v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
+ return v4l2_g_ext_ctrls(NULL, vfd->ctrl_handler, p);
if (ops->vidioc_g_ext_ctrls == NULL)
return -ENOTTY;
return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
@@ -2096,6 +2097,7 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
p->error_idx = p->count;
+
if (vfh && vfh->ctrl_handler)
return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
if (vfd->ctrl_handler)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index c5639817db34..c547788026c6 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -202,7 +202,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
case VIDIOC_G_EXT_CTRLS:
- return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
+ return v4l2_g_ext_ctrls(vfh, vfh->ctrl_handler, arg);
case VIDIOC_S_EXT_CTRLS:
return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 3a10fb3419e3..7c6a76479099 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -1126,12 +1126,13 @@ int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
* v4l2_g_ext_ctrls - Helper function to implement
* :ref:`VIDIOC_G_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
+ * @fh: pointer to &struct v4l2_fh
* @hdl: pointer to &struct v4l2_ctrl_handler
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
-int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+int v4l2_g_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
struct v4l2_ext_controls *c);
/**
--
2.16.1.291.g4437f3f132-goog
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