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[98.210.181.167]) by smtp.googlemail.com with ESMTPSA id r16-v6sm30143804pfe.173.2018.07.09.15.39.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 09 Jul 2018 15:39:50 -0700 (PDT) From: Steve Longerbeam X-Google-Original-From: Steve Longerbeam To: linux-media@vger.kernel.org Cc: Steve Longerbeam , Mauro Carvalho Chehab , Philipp Zabel , Hans Verkuil , Arnd Bergmann , Geert Uytterhoeven , Laurent Pinchart , Jacob Chen , Neil Armstrong , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v6 07/17] media: platform: video-mux: Register a subdev notifier Date: Mon, 9 Jul 2018 15:39:07 -0700 Message-Id: <1531175957-1973-8-git-send-email-steve_longerbeam@mentor.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1531175957-1973-1-git-send-email-steve_longerbeam@mentor.com> References: <1531175957-1973-1-git-send-email-steve_longerbeam@mentor.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Parse neighbor remote devices on the video muxes input ports, add them to a subdev notifier, and register the subdev notifier for the video mux, by calling v4l2_async_register_fwnode_subdev(). Signed-off-by: Steve Longerbeam --- Changes since v5: - add missing select V4L2_FWNODE to Kconfig for VIDEO_MUX Changes since v4: - none Changes since v3: - pass num_pads - 1 (num_input_pads) to video_mux_async_register(). Changes since v2: - none Changes since v1: - add #include for kcalloc() declaration. --- drivers/media/platform/Kconfig | 1 + drivers/media/platform/video-mux.c | 36 +++++++++++++++++++++++++++++++++++- 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig index 210b44a..6c3b2b7 100644 --- a/drivers/media/platform/Kconfig +++ b/drivers/media/platform/Kconfig @@ -58,6 +58,7 @@ config VIDEO_MUX select MULTIPLEXER depends on VIDEO_V4L2 && OF && VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER select REGMAP + select V4L2_FWNODE help This driver provides support for N:1 video bus multiplexers. diff --git a/drivers/media/platform/video-mux.c b/drivers/media/platform/video-mux.c index 1fb8872..e54a719 100644 --- a/drivers/media/platform/video-mux.c +++ b/drivers/media/platform/video-mux.c @@ -21,8 +21,10 @@ #include #include #include +#include #include #include +#include #include struct video_mux { @@ -207,6 +209,38 @@ static const struct v4l2_subdev_ops video_mux_subdev_ops = { .video = &video_mux_subdev_video_ops, }; +static int video_mux_parse_endpoint(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd) +{ + /* + * it's not an error if remote is missing on a video-mux + * input port, return -ENOTCONN to skip this endpoint with + * no error. + */ + return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN; +} + +static int video_mux_async_register(struct video_mux *vmux, + unsigned int num_input_pads) +{ + unsigned int i, *ports; + int ret; + + ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL); + if (!ports) + return -ENOMEM; + for (i = 0; i < num_input_pads; i++) + ports[i] = i; + + ret = v4l2_async_register_fwnode_subdev( + &vmux->subdev, sizeof(struct v4l2_async_subdev), + ports, num_input_pads, video_mux_parse_endpoint); + + kfree(ports); + return ret; +} + static int video_mux_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -272,7 +306,7 @@ static int video_mux_probe(struct platform_device *pdev) vmux->subdev.entity.ops = &video_mux_ops; - return v4l2_async_register_subdev(&vmux->subdev); + return video_mux_async_register(vmux, num_pads - 1); } static int video_mux_remove(struct platform_device *pdev) -- 2.7.4