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Groups > linux.kernel > #1660089
| From | Steve Longerbeam <slongerbeam@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v8 16/34] platform: add video-multiplexer subdevice driver |
| Date | 2017-06-07 20:40 +0200 |
| Message-ID | <tPO28-1PO-63@gated-at.bofh.it> (permalink) |
| References | <tPO26-1PO-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Philipp Zabel <p.zabel@pengutronix.de>
This driver can handle SoC internal and external video bus multiplexers,
controlled by mux controllers provided by the mux controller framework,
such as MMIO register bitfields or GPIOs. The subdevice passes through
the mbus configuration of the active input to the output side.
Since the mux framework is not yet merged, this driver contains
temporary mmio-mux support to work without the framework. The driver
should be converted to use the multiplexer API once the "mux: minimal
mux subsystem" and "mux: mmio-based syscon mux controller" patches are
merged.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
drivers/media/platform/Kconfig | 6 +
drivers/media/platform/Makefile | 2 +
drivers/media/platform/video-mux.c | 334 +++++++++++++++++++++++++++++++++++++
3 files changed, 342 insertions(+)
create mode 100644 drivers/media/platform/video-mux.c
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 288d3b0..1940d87 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -74,6 +74,12 @@ config VIDEO_M32R_AR_M64278
To compile this driver as a module, choose M here: the
module will be called arv.
+config VIDEO_MUX
+ tristate "Video Multiplexer"
+ depends on OF && VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
+ help
+ This driver provides support for N:1 video bus multiplexers.
+
config VIDEO_OMAP3
tristate "OMAP 3 Camera support"
depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 231f3c2..a9ff99d 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -28,6 +28,8 @@ obj-$(CONFIG_VIDEO_SH_VEU) += sh_veu.o
obj-$(CONFIG_VIDEO_MEM2MEM_DEINTERLACE) += m2m-deinterlace.o
+obj-$(CONFIG_VIDEO_MUX) += video-mux.o
+
obj-$(CONFIG_VIDEO_S3C_CAMIF) += s3c-camif/
obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS4_IS) += exynos4-is/
obj-$(CONFIG_VIDEO_SAMSUNG_S5P_JPEG) += s5p-jpeg/
diff --git a/drivers/media/platform/video-mux.c b/drivers/media/platform/video-mux.c
new file mode 100644
index 0000000..6657447
--- /dev/null
+++ b/drivers/media/platform/video-mux.c
@@ -0,0 +1,334 @@
+/*
+ * video stream multiplexer controlled via mux control
+ *
+ * Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+
+struct video_mux {
+ struct v4l2_subdev subdev;
+ struct media_pad *pads;
+ struct v4l2_mbus_framefmt *format_mbus;
+ struct regmap_field *field;
+ struct mutex lock;
+ int active;
+};
+
+static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct video_mux, subdev);
+}
+
+static int video_mux_link_setup(struct media_entity *entity,
+ const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+ struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
+ int ret = 0;
+
+ /*
+ * The mux state is determined by the enabled sink pad link.
+ * Enabling or disabling the source pad link has no effect.
+ */
+ if (local->flags & MEDIA_PAD_FL_SOURCE)
+ return 0;
+
+ dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
+ remote->entity->name, remote->index, local->entity->name,
+ local->index, flags & MEDIA_LNK_FL_ENABLED);
+
+ mutex_lock(&vmux->lock);
+
+ if (flags & MEDIA_LNK_FL_ENABLED) {
+ if (vmux->active == local->index)
+ goto out;
+
+ if (vmux->active >= 0) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ dev_dbg(sd->dev, "setting %d active\n", local->index);
+ ret = regmap_field_write(vmux->field, local->index);
+ if (ret < 0)
+ goto out;
+ vmux->active = local->index;
+ } else {
+ if (vmux->active != local->index)
+ goto out;
+
+ dev_dbg(sd->dev, "going inactive\n");
+ vmux->active = -1;
+ }
+
+out:
+ mutex_unlock(&vmux->lock);
+ return ret;
+}
+
+static const struct media_entity_operations video_mux_ops = {
+ .link_setup = video_mux_link_setup,
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
+ struct v4l2_subdev *upstream_sd;
+ struct media_pad *pad;
+
+ if (vmux->active == -1) {
+ dev_err(sd->dev, "Can not start streaming on inactive mux\n");
+ return -EINVAL;
+ }
+
+ pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
+ if (!pad) {
+ dev_err(sd->dev, "Failed to find remote source pad\n");
+ return -ENOLINK;
+ }
+
+ if (!is_media_entity_v4l2_subdev(pad->entity)) {
+ dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
+ return -ENODEV;
+ }
+
+ upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
+
+ return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
+}
+
+static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
+ .s_stream = video_mux_s_stream,
+};
+
+static struct v4l2_mbus_framefmt *
+__video_mux_get_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ unsigned int pad, u32 which)
+{
+ struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
+
+ switch (which) {
+ case V4L2_SUBDEV_FORMAT_TRY:
+ return v4l2_subdev_get_try_format(sd, cfg, pad);
+ case V4L2_SUBDEV_FORMAT_ACTIVE:
+ return &vmux->format_mbus[pad];
+ default:
+ return NULL;
+ }
+}
+
+static int video_mux_get_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
+
+ mutex_lock(&vmux->lock);
+
+ sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
+ sdformat->which);
+
+ mutex_unlock(&vmux->lock);
+
+ return 0;
+}
+
+static int video_mux_set_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
+ struct v4l2_mbus_framefmt *mbusformat;
+ struct media_pad *pad = &vmux->pads[sdformat->pad];
+
+ mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
+ sdformat->which);
+ if (!mbusformat)
+ return -EINVAL;
+
+ mutex_lock(&vmux->lock);
+
+ /* Source pad mirrors active sink pad, no limitations on sink pads */
+ if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
+ sdformat->format = vmux->format_mbus[vmux->active];
+
+ *mbusformat = sdformat->format;
+
+ mutex_unlock(&vmux->lock);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
+ .get_fmt = video_mux_get_format,
+ .set_fmt = video_mux_set_format,
+};
+
+static const struct v4l2_subdev_ops video_mux_subdev_ops = {
+ .pad = &video_mux_pad_ops,
+ .video = &video_mux_subdev_video_ops,
+};
+
+static int video_mux_probe_mmio_mux(struct video_mux *vmux)
+{
+ struct device *dev = vmux->subdev.dev;
+ struct of_phandle_args args;
+ struct reg_field field;
+ struct regmap *regmap;
+ u32 reg, mask;
+ int ret;
+
+ ret = of_parse_phandle_with_args(dev->of_node, "mux-controls",
+ "#mux-control-cells", 0, &args);
+ if (ret)
+ return ret;
+
+ if (!of_device_is_compatible(args.np, "mmio-mux"))
+ return -EINVAL;
+
+ regmap = syscon_node_to_regmap(args.np->parent);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ ret = of_property_read_u32_index(args.np, "mux-reg-masks",
+ 2 * args.args[0], ®);
+ if (!ret)
+ ret = of_property_read_u32_index(args.np, "mux-reg-masks",
+ 2 * args.args[0] + 1, &mask);
+ if (ret < 0)
+ return ret;
+
+ field.reg = reg;
+ field.msb = fls(mask) - 1;
+ field.lsb = ffs(mask) - 1;
+
+ vmux->field = devm_regmap_field_alloc(dev, regmap, field);
+ if (IS_ERR(vmux->field))
+ return PTR_ERR(vmux->field);
+
+ return 0;
+}
+
+static int video_mux_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct device_node *ep;
+ struct video_mux *vmux;
+ unsigned int num_pads = 0;
+ int ret;
+ int i;
+
+ vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
+ if (!vmux)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, vmux);
+
+ v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
+ snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%s", np->name);
+ vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ vmux->subdev.dev = dev;
+
+ /*
+ * The largest numbered port is the output port. It determines
+ * total number of pads.
+ */
+ for_each_endpoint_of_node(np, ep) {
+ struct of_endpoint endpoint;
+
+ of_graph_parse_endpoint(ep, &endpoint);
+ num_pads = max(num_pads, endpoint.port + 1);
+ }
+
+ if (num_pads < 2) {
+ dev_err(dev, "Not enough ports %d\n", num_pads);
+ return -EINVAL;
+ }
+
+ ret = video_mux_probe_mmio_mux(vmux);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get mux: %d\n", ret);
+ return ret;
+ }
+
+ mutex_init(&vmux->lock);
+ vmux->active = -1;
+ vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
+ GFP_KERNEL);
+ vmux->format_mbus = devm_kcalloc(dev, num_pads,
+ sizeof(*vmux->format_mbus),
+ GFP_KERNEL);
+
+ for (i = 0; i < num_pads - 1; i++)
+ vmux->pads[i].flags = MEDIA_PAD_FL_SINK;
+ vmux->pads[num_pads - 1].flags = MEDIA_PAD_FL_SOURCE;
+
+ vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
+ ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
+ vmux->pads);
+ if (ret < 0)
+ return ret;
+
+ vmux->subdev.entity.ops = &video_mux_ops;
+
+ return v4l2_async_register_subdev(&vmux->subdev);
+}
+
+static int video_mux_remove(struct platform_device *pdev)
+{
+ struct video_mux *vmux = platform_get_drvdata(pdev);
+ struct v4l2_subdev *sd = &vmux->subdev;
+
+ v4l2_async_unregister_subdev(sd);
+ media_entity_cleanup(&sd->entity);
+
+ return 0;
+}
+
+static const struct of_device_id video_mux_dt_ids[] = {
+ { .compatible = "video-mux", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
+
+static struct platform_driver video_mux_driver = {
+ .probe = video_mux_probe,
+ .remove = video_mux_remove,
+ .driver = {
+ .of_match_table = video_mux_dt_ids,
+ .name = "video-mux",
+ },
+};
+
+module_platform_driver(video_mux_driver);
+
+MODULE_DESCRIPTION("video stream multiplexer");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_AUTHOR("Philipp Zabel, Pengutronix");
+MODULE_LICENSE("GPL");
--
2.7.4
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[PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 28/34] media: imx: csi: add frame skipping support Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 11/34] ARM: dts: imx6-sabreauto: create i2cmux for i2c3 Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 26/34] media: imx: csi: add support for bayer formats Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 31/34] media: imx: capture: add frame sizes/interval enumeration Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 25/34] media: imx: Add MIPI CSI-2 Receiver subdev driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 32/34] media: imx: set and propagate default field, colorimetry Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 33/34] media: imx: Drop warning upon multiple S_STREAM disable calls Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 30/34] media: imx: csi: add frame size/interval enumeration Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 16/34] platform: add video-multiplexer subdevice driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
[PATCH v8 09/34] ARM: dts: imx6-sabrelite: add OV5642 and OV5640 camera sensors Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 18/34] media: Add userspace header file for i.MX Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 07/34] ARM: dts: imx6qdl: add capture-subsystem device Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 15/34] add mux and video interface bridge entity functions Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 23/34] media: imx: Add VDIC subdev driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 04/34] ARM: dts: imx6qdl: add multiplexer controls Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 21/34] media: imx: Add Capture Device Interface Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 13/34] ARM: dts: imx6-sabreauto: add pinctrl for gpt input capture Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 06/34] ARM: dts: imx6qdl: Add video multiplexers, mipi_csi, and their connections Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 12/34] ARM: dts: imx6-sabreauto: add reset-gpios property for max7310_b Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 03/34] [media] dt/bindings: Add bindings for OV5640 Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
[PATCH v8 01/34] dt-bindings: Add bindings for video-multiplexer device Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Hans Verkuil <hverkuil@xs4all.nl> - 2017-06-07 21:10 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 21:10 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:20 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:20 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Hans Verkuil <hverkuil@xs4all.nl> - 2017-06-10 01:30 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Pavel Machek <pavel@ucw.cz> - 2017-06-10 09:40 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> - 2017-06-11 22:10 +0200
Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-12 20:20 +0200
Re: [PATCH v8 19/34] media: Add i.MX media core driver Philipp Zabel <p.zabel@pengutronix.de> - 2017-06-09 15:20 +0200
Re: [PATCH v8 19/34] media: Add i.MX media core driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:10 +0200
Re: [PATCH v8 17/34] [media] add Omnivision OV5640 sensor driver Sakari Ailus <sakari.ailus@iki.fi> - 2017-06-11 00:00 +0200
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