From patchwork Tue Dec 22 16:43:05 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 2356 Return-path: Envelope-to: mchehab@infradead.org Delivery-date: Tue, 22 Dec 2009 16:45:10 +0000 Received: from bombadil.infradead.org [18.85.46.34] by gaivota.chehab.org with IMAP (fetchmail-6.3.11) for (single-drop); Tue, 22 Dec 2009 14:48:12 -0200 (BRST) Received: from vger.kernel.org ([209.132.180.67]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1NN7rC-0004Qc-9q; Tue, 22 Dec 2009 16:45:10 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753766AbZLVQox (ORCPT + 1 other); Tue, 22 Dec 2009 11:44:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753802AbZLVQox (ORCPT ); Tue, 22 Dec 2009 11:44:53 -0500 Received: from smtp.nokia.com ([192.100.122.230]:36257 "EHLO mgw-mx03.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753726AbZLVQow (ORCPT ); Tue, 22 Dec 2009 11:44:52 -0500 Received: from esebh105.NOE.Nokia.com (esebh105.ntc.nokia.com [172.21.138.211]) by mgw-mx03.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id nBMGieCf022919; Tue, 22 Dec 2009 18:44:48 +0200 Received: from esebh102.NOE.Nokia.com ([172.21.138.183]) by esebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 22 Dec 2009 18:43:14 +0200 Received: from mgw-sa02.ext.nokia.com ([147.243.1.48]) by esebh102.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Tue, 22 Dec 2009 18:43:14 +0200 Received: from maxwell.research.nokia.com (maxwell.research.nokia.com [172.21.50.162]) by mgw-sa02.ext.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id nBMGhC0e031467; Tue, 22 Dec 2009 18:43:12 +0200 Received: from lanttu (lanttu.localdomain [192.168.239.4]) by maxwell.research.nokia.com (Postfix) with ESMTPS id 44CD670088; Tue, 22 Dec 2009 18:43:12 +0200 (EET) Received: from sakke by lanttu with local (Exim 4.69) (envelope-from ) id 1NN7pH-0002So-TB; Tue, 22 Dec 2009 18:43:11 +0200 From: Sakari Ailus To: linux-media@vger.kernel.org Cc: laurent.pinchart@ideasonboard.com, iivanov@mm-sol.com, hverkuil@xs4all.nl, gururaj.nagendra@intel.com Subject: [RFC v2 1/7] V4L: File handles Date: Tue, 22 Dec 2009 18:43:05 +0200 Message-Id: <1261500191-9441-1-git-send-email-sakari.ailus@maxwell.research.nokia.com> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <4B30F713.8070004@maxwell.research.nokia.com> References: <4B30F713.8070004@maxwell.research.nokia.com> X-OriginalArrivalTime: 22 Dec 2009 16:43:14.0627 (UTC) FILETIME=[DB17A930:01CA8325] X-Nokia-AV: Clean Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch adds a list of v4l2_fh structures to every video_device. It allows using file handle related information in V4L2. The event interface is one example of such use. Video device drivers should use the v4l2_fh pointer as their file->private_data. Signed-off-by: Sakari Ailus --- drivers/media/video/Makefile | 2 +- drivers/media/video/v4l2-dev.c | 2 + drivers/media/video/v4l2-fh.c | 57 ++++++++++++++++++++++++++++++++++++++++ include/media/v4l2-dev.h | 4 +++ include/media/v4l2-fh.h | 41 ++++++++++++++++++++++++++++ 5 files changed, 105 insertions(+), 1 deletions(-) create mode 100644 drivers/media/video/v4l2-fh.c create mode 100644 include/media/v4l2-fh.h diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index a61e3f3..1947146 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -10,7 +10,7 @@ stkwebcam-objs := stk-webcam.o stk-sensor.o omap2cam-objs := omap24xxcam.o omap24xxcam-dma.o -videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o +videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o # V4L2 core modules diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 7090699..15b2ac8 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -421,6 +421,8 @@ static int __video_register_device(struct video_device *vdev, int type, int nr, if (!vdev->release) return -EINVAL; + v4l2_fh_init(vdev); + /* Part 1: check device type */ switch (type) { case VFL_TYPE_GRABBER: diff --git a/drivers/media/video/v4l2-fh.c b/drivers/media/video/v4l2-fh.c new file mode 100644 index 0000000..406e4ac --- /dev/null +++ b/drivers/media/video/v4l2-fh.c @@ -0,0 +1,57 @@ +/* + * drivers/media/video/v4l2-fh.c + * + * V4L2 file handles. + * + * Copyright (C) 2009 Nokia Corporation. + * + * Contact: Sakari Ailus + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include +#include + +#include +#include + +int v4l2_fh_add(struct video_device *vdev, struct v4l2_fh *fh) +{ + unsigned long flags; + + spin_lock_irqsave(&vdev->fh_lock, flags); + list_add(&fh->list, &vdev->fh); + spin_unlock_irqrestore(&vdev->fh_lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_fh_add); + +void v4l2_fh_del(struct video_device *vdev, struct v4l2_fh *fh) +{ + unsigned long flags; + + spin_lock_irqsave(&vdev->fh_lock, flags); + list_del(&fh->list); + spin_unlock_irqrestore(&vdev->fh_lock, flags); +} +EXPORT_SYMBOL_GPL(v4l2_fh_del); + +void v4l2_fh_init(struct video_device *vdev) +{ + spin_lock_init(&vdev->fh_lock); + INIT_LIST_HEAD(&vdev->fh); +} diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 2dee938..8eac93d 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -16,6 +16,8 @@ #include #include +#include + #define VIDEO_MAJOR 81 #define VFL_TYPE_GRABBER 0 @@ -77,6 +79,8 @@ struct video_device /* attribute to differentiate multiple indices on one physical device */ int index; + spinlock_t fh_lock; /* Lock for file handle list */ + struct list_head fh; /* File handle list */ int debug; /* Activates debug level*/ /* Video standard vars */ diff --git a/include/media/v4l2-fh.h b/include/media/v4l2-fh.h new file mode 100644 index 0000000..1efa916 --- /dev/null +++ b/include/media/v4l2-fh.h @@ -0,0 +1,41 @@ +/* + * include/media/v4l2-fh.h + * + * V4L2 file handle. + * + * Copyright (C) 2009 Nokia Corporation. + * + * Contact: Sakari Ailus + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#ifndef V4L2_FH_H +#define V4L2_FH_H + +#include +#include + +struct v4l2_fh { + struct list_head list; +}; + +struct video_device; + +int v4l2_fh_add(struct video_device *vdev, struct v4l2_fh *fh); +void v4l2_fh_del(struct video_device *vdev, struct v4l2_fh *fh); +void v4l2_fh_init(struct video_device *vdev); + +#endif /* V4L2_EVENT_H */