From patchwork Tue May 13 05:59:02 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun Kumar K X-Patchwork-Id: 4162331 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EA15FBFF02 for ; Tue, 13 May 2014 05:59:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0BA9C20328 for ; Tue, 13 May 2014 05:59:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA4A62034A for ; Tue, 13 May 2014 05:59:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751336AbaEMF7T (ORCPT ); Tue, 13 May 2014 01:59:19 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:50323 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751191AbaEMF7R (ORCPT ); Tue, 13 May 2014 01:59:17 -0400 Received: by mail-pa0-f44.google.com with SMTP id ld10so9782824pab.31 for ; Mon, 12 May 2014 22:59:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=ONWjtMI1/dGCR2cxGeQTx72nOgo47ABTwmgA518eVD0=; b=Ruu5ctlPHGHmPnmbhdoXY869EzXos5pLPwnYu8A0ZOy64N6dGs2glZQTbkwoKCnnYV t/kWXbyUwyGGsoKvZ9pniDfmkPR+Q2qWEBofQCuu7nxhpwIVL6z3hfbDCdOcqbmWObaa zUyfLYKAexgJfx8m9Bw+7cMNaeOX5EVnygHeb+urU+RW4kjm01Cwjx4JrtTX8AqSyHAD IUcRCUEzbhT0b3mD6PpZmL0CShUYu1u4lwL4RnhKW7IRbfZnLi4Vd3lKpAppwXBxxxmY 2TejMsnfYCkr+KcpzLfyUCRAPLXXLG7yLrFKT2gIVzZPNUN2DglJLpo0tCLP7Xe8DAzA ftNw== X-Received: by 10.68.168.5 with SMTP id zs5mr2876004pbb.107.1399960757386; Mon, 12 May 2014 22:59:17 -0700 (PDT) Received: from localhost.localdomain ([14.140.216.146]) by mx.google.com with ESMTPSA id ek2sm26139959pbd.30.2014.05.12.22.59.13 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 12 May 2014 22:59:16 -0700 (PDT) From: Arun Kumar K To: linux-media@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: k.debski@samsung.com, s.nawrocki@samsung.com, hverkuil@xs4all.nl, laurent.pinchart@ideasonboard.com, posciak@chromium.org, arunkk.samsung@gmail.com Subject: [PATCH v4 1/2] [media] v4l: Add source change event Date: Tue, 13 May 2014 11:29:02 +0530 Message-Id: <1399960743-4542-2-git-send-email-arun.kk@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1399960743-4542-1-git-send-email-arun.kk@samsung.com> References: <1399960743-4542-1-git-send-email-arun.kk@samsung.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This event indicates that the video device has encountered a source parameter change during runtime. This can typically be a resolution change detected by a video decoder OR a format change detected by an HDMI connector. This needs to be nofified to the userspace and the application may be expected to reallocate buffers before proceeding. The application can subscribe to events on a specific pad or input port which it is interested in. Signed-off-by: Arun Kumar K --- Documentation/DocBook/media/v4l/vidioc-dqevent.xml | 32 +++++++++++++++++ .../DocBook/media/v4l/vidioc-subscribe-event.xml | 19 +++++++++++ drivers/media/v4l2-core/v4l2-event.c | 36 ++++++++++++++++++++ include/media/v4l2-event.h | 4 +++ include/uapi/linux/videodev2.h | 8 +++++ 5 files changed, 99 insertions(+) diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml index 89891ad..6afabaa 100644 --- a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml +++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml @@ -242,6 +242,22 @@ + + struct <structname>v4l2_event_src_change</structname> + + &cs-str; + + + __u32 + changes + + A bitmask that tells what has changed. See . + + + + +
+ Changes @@ -270,6 +286,22 @@
+ + + Source Changes + + &cs-def; + + + V4L2_EVENT_SRC_CH_RESOLUTION + 0x0001 + This event gets triggered when a resolution change is + detected at runtime. This can typically come from a video decoder. + + + + +
&return-value; diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml index 5c70b61..067a0d5 100644 --- a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml +++ b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml @@ -155,6 +155,25 @@ + V4L2_EVENT_SOURCE_CHANGE + 5 + + This event is triggered when a source parameter change is + detected during runtime by the video device. It can be a + runtime resolution change triggered by a video decoder or the + format change happening on an HDMI connector. + This event requires that the id + matches the pad / input index from which you want to receive + events. + + This event has a &v4l2-event-source-change; associated + with it. The changes bitfield denotes + what has changed for the subscribed pad. If multiple events + occured before application could dequeue them, then the changes + will have the ORed value of all the events generated. + + + V4L2_EVENT_PRIVATE_START 0x08000000 Base event number for driver-private events. diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c index 86dcb54..8761aab 100644 --- a/drivers/media/v4l2-core/v4l2-event.c +++ b/drivers/media/v4l2-core/v4l2-event.c @@ -318,3 +318,39 @@ int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh, return v4l2_event_unsubscribe(fh, sub); } EXPORT_SYMBOL_GPL(v4l2_event_subdev_unsubscribe); + +static void v4l2_event_src_replace(struct v4l2_event *old, + const struct v4l2_event *new) +{ + u32 old_changes = old->u.src_change.changes; + + old->u.src_change = new->u.src_change; + old->u.src_change.changes |= old_changes; +} + +static void v4l2_event_src_merge(const struct v4l2_event *old, + struct v4l2_event *new) +{ + new->u.src_change.changes |= old->u.src_change.changes; +} + +static const struct v4l2_subscribed_event_ops v4l2_event_src_ch_ops = { + .replace = v4l2_event_src_replace, + .merge = v4l2_event_src_merge, +}; + +int v4l2_src_change_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + if (sub->type == V4L2_EVENT_SOURCE_CHANGE) + return v4l2_event_subscribe(fh, sub, 0, &v4l2_event_src_ch_ops); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subscribe); + +int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd, + struct v4l2_fh *fh, struct v4l2_event_subscription *sub) +{ + return v4l2_src_change_event_subscribe(fh, sub); +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subdev_subscribe); diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h index be05d01..1ab9045 100644 --- a/include/media/v4l2-event.h +++ b/include/media/v4l2-event.h @@ -132,4 +132,8 @@ int v4l2_event_unsubscribe(struct v4l2_fh *fh, void v4l2_event_unsubscribe_all(struct v4l2_fh *fh); int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh, struct v4l2_event_subscription *sub); +int v4l2_src_change_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub); +int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd, + struct v4l2_fh *fh, struct v4l2_event_subscription *sub); #endif /* V4L2_EVENT_H */ diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index ea468ee..b923d91 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -1765,6 +1765,7 @@ struct v4l2_streamparm { #define V4L2_EVENT_EOS 2 #define V4L2_EVENT_CTRL 3 #define V4L2_EVENT_FRAME_SYNC 4 +#define V4L2_EVENT_SOURCE_CHANGE 5 #define V4L2_EVENT_PRIVATE_START 0x08000000 /* Payload for V4L2_EVENT_VSYNC */ @@ -1796,12 +1797,19 @@ struct v4l2_event_frame_sync { __u32 frame_sequence; }; +#define V4L2_EVENT_SRC_CH_RESOLUTION (1 << 0) + +struct v4l2_event_src_change { + __u32 changes; +}; + struct v4l2_event { __u32 type; union { struct v4l2_event_vsync vsync; struct v4l2_event_ctrl ctrl; struct v4l2_event_frame_sync frame_sync; + struct v4l2_event_src_change src_change; __u8 data[64]; } u; __u32 pending;