This driver can handle SoC internal and extern video bus multiplexers,
controlled either by register bit fields or by GPIO.
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
drivers/media/platform/imx/Kconfig | 8 +
drivers/media/platform/imx/Makefile | 1 +
drivers/media/platform/imx/imx-video-switch.c | 347 ++++++++++++++++++++++++++
3 files changed, 356 insertions(+)
create mode 100644 drivers/media/platform/imx/imx-video-switch.c
diff --git a/drivers/media/platform/imx/Kconfig
b/drivers/media/platform/imx/Kconfig
index 8431441..ffced1c 100644
--- a/drivers/media/platform/imx/Kconfig
+++ b/drivers/media/platform/imx/Kconfig
@@ -11,6 +11,14 @@ config MEDIA_IMX_IPU
This driver provides core support for the i.MX IPUv3 contained in
i.MX5 and i.MX6 SoCs.
+config MEDIA_IMX_VIDEO_SWITCH
+ tristate "i.MX Video Bus Multiplexer"
+ depends on VIDEO_V4L2_SUBDEV_API
+ help
+ This driver provides support for SoC internal video bus multiplexers
+ controlled by register bitfields as well as external multiplexers
+ controller by a GPIO.
+
config VIDEO_IMX_IPU_COMMON
tristate
diff --git a/drivers/media/platform/imx/Makefile
b/drivers/media/platform/imx/Makefile
index 49d8fab..d972674 100644
--- a/drivers/media/platform/imx/Makefile
+++ b/drivers/media/platform/imx/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_MEDIA_IMX) += imx-media.o
+obj-$(CONFIG_MEDIA_IMX_VIDEO_SWITCH) += imx-video-switch.o
obj-$(CONFIG_VIDEO_IMX_IPU_COMMON) += imx-ipu.o
obj-$(CONFIG_VIDEO_IMX_IPU_CSI) += imx-ipuv3-csi.o
obj-$(CONFIG_VIDEO_IMX_IPU_SCALER) += imx-ipu-scaler.o
diff --git a/drivers/media/platform/imx/imx-video-switch.c
b/drivers/media/platform/imx/imx-video-switch.c
new file mode 100644
index 0000000..7a5f64f
--- /dev/null
+++ b/drivers/media/platform/imx/imx-video-switch.c
@@ -0,0 +1,347 @@
+/*
+ * devicetree probed mediacontrol multiplexer.
+ *
+ * Copyright (C) 2013 Sascha Hauer, Pengutronix
+ *
+ * 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/gpio.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/of_graph.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-of.h>
+
+#include <media/imx.h> /* for ipu_media_entity_create_link */
+
+enum {
+ PAD_INPUT0,
+ PAD_INPUT1,
+ PAD_OUTPUT,
+ PAD_NUM,
+};
+
+struct vidsw {
+ struct device *dev;
+ struct v4l2_subdev subdev;
+ struct media_pad pads[PAD_NUM];
+ struct v4l2_mbus_framefmt format_mbus[PAD_NUM];
+ struct v4l2_of_endpoint endpoint[PAD_NUM - 1];
+ struct regmap_field *field;
+ unsigned int gpio;
+ int streaming;
+ int active;
+};
+
+#define to_vidsw(sd) container_of(sd, struct vidsw, subdev)
+
+static int vidsw_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 vidsw *vidsw = to_vidsw(sd);
+
+ dev_dbg(vidsw->dev, "link setup %s -> %s", remote->entity->name,
+ local->entity->name);
+
+ if (vidsw->streaming)
+ return -EBUSY;
+
+ if (!(flags & MEDIA_LNK_FL_ENABLED)) {
+ if (local->index == vidsw->active) {
+ dev_dbg(vidsw->dev, "going inactive\n");
+ vidsw->active = -1;
+ }
+ return 0;
+ }
+
+ if (vidsw->active >= 0) {
+ if (vidsw->active == local->index)
+ return 0;
+ else
+ return -EBUSY;
+ }
+
+ vidsw->active = local->index;
+
+ dev_dbg(vidsw->dev, "setting %d active\n", vidsw->active);
+
+ if (vidsw->field)
+ regmap_field_write(vidsw->field, vidsw->active);
+ else if (gpio_is_valid(vidsw->gpio))
+ gpio_set_value(vidsw->gpio, vidsw->active);
+
+ return 0;
+}
+
+static struct media_entity_operations vidsw_ops = {
+ .link_setup = vidsw_link_setup,
+};
+
+static int vidsw_async_init(struct vidsw *vidsw, struct device_node *node)
+{
+ struct v4l2_of_endpoint endpoint;
+ struct device_node *rp, *port;
+ u32 portno;
+ int numports;
+ int ret;
+
+ numports = PAD_NUM;
+
+ vidsw->pads[PAD_INPUT0].flags = MEDIA_PAD_FL_SINK;
+ vidsw->pads[PAD_INPUT1].flags = MEDIA_PAD_FL_SINK;
+ vidsw->pads[PAD_OUTPUT].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_init(&vidsw->subdev.entity, numports, vidsw->pads,
0);
+ if (ret < 0)
+ return ret;
+
+ vidsw->subdev.entity.ops = &vidsw_ops;
+
+ rp = NULL;
+
+ while (1) {
+ rp = of_graph_get_next_endpoint(node, rp);
+ if (!rp)
+ break;
+
+ port = of_get_parent(rp);
+ if (!port)
+ return -EINVAL;
+
+ portno = 0;
+ of_property_read_u32(port, "reg", &portno);
+
+ v4l2_of_parse_endpoint(rp, &endpoint);
+ of_node_put(rp);
+
+ if (portno > 1)
+ break;
+
+ vidsw->endpoint[portno] = endpoint;
+
+ /* FIXME */
+ ipu_media_entity_create_link(&vidsw->subdev, portno, rp, 0);
+ }
+
+ return 0;
+}
+
+static int vidsw_registered(struct v4l2_subdev *sd)
+{
+ return 0;
+}
+
+int vidsw_g_mbus_config(struct v4l2_subdev *sd, struct v4l2_mbus_config *cfg)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+ dev_dbg(vidsw->dev, "reporting configration %d\n", vidsw->active);
+
+ /* Mirror the input side on the output side */
+ cfg->type = vidsw->endpoint[vidsw->active].bus_type;
+ if (cfg->type == V4L2_MBUS_PARALLEL || cfg->type == V4L2_MBUS_BT656)
+ cfg->flags = vidsw->endpoint[vidsw->active].bus.parallel.flags;
+
+ return 0;
+}
+
+static const struct v4l2_subdev_video_ops vidsw_subdev_video_ops = {
+ .g_mbus_config = vidsw_g_mbus_config,
+};
+
+static struct v4l2_mbus_framefmt *
+__vidsw_get_pad_format(struct vidsw *vidsw, struct v4l2_subdev_fh *fh,
+ unsigned int pad, u32 which)
+{
+ switch (which) {
+ case V4L2_SUBDEV_FORMAT_TRY:
+ return v4l2_subdev_get_try_format(fh, pad);
+ case V4L2_SUBDEV_FORMAT_ACTIVE:
+ return &vidsw->format_mbus[pad];
+ default:
+ return NULL;
+ }
+}
+
+static int vidsw_get_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+ sdformat->format = *__vidsw_get_pad_format(vidsw, fh, sdformat->pad,
+ sdformat->which);
+ return 0;
+}
+
+static int vidsw_set_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+ struct v4l2_mbus_framefmt *mbusformat;
+
+ if (sdformat->pad >= PAD_NUM)
+ return -EINVAL;
+
+ mbusformat = __vidsw_get_pad_format(vidsw, fh, sdformat->pad,
+ sdformat->which);
+ if (!mbusformat)
+ return -EINVAL;
+
+ /* Output pad mirrors active input pad, no limitations on input pads */
+ if (sdformat->pad == PAD_OUTPUT && vidsw->active >= 0)
+ *mbusformat = vidsw->format_mbus[vidsw->active];
+ else
+ *mbusformat = sdformat->format;
+
+ sdformat->format = *mbusformat;
+
+ return 0;
+}
+
+static struct v4l2_subdev_pad_ops vidsw_pad_ops = {
+ .get_fmt = vidsw_get_format,
+ .set_fmt = vidsw_set_format,
+};
+
+static struct v4l2_subdev_ops vidsw_subdev_ops = {
+ .pad = &vidsw_pad_ops,
+ .video = &vidsw_subdev_video_ops,
+};
+
+static struct v4l2_subdev_internal_ops vidsw_internal_ops = {
+ .registered = vidsw_registered,
+};
+
+static int of_get_reg_field(struct device_node *node, struct reg_field *field)
+{
+ u32 bit_mask;
+ int ret;
+
+ ret = of_property_read_u32(node, "reg", &field->reg);
+ if (ret < 0)
+ return ret;
+
+ ret = of_property_read_u32(node, "bit-mask", &bit_mask);
+ if (ret < 0)
+ return ret;
+
+ ret = of_property_read_u32(node, "bit-shift", &field->lsb);
+ if (ret < 0)
+ return ret;
+
+ field->msb = field->lsb + ffs(bit_mask) - 1;
+
+ return 0;
+}
+
+static int vidsw_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct reg_field field;
+ struct vidsw *vidsw;
+ struct regmap *map;
+ int num_pads;
+ int ret;
+
+ vidsw = devm_kzalloc(&pdev->dev, sizeof(*vidsw), GFP_KERNEL);
+ if (!vidsw)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, vidsw);
+
+ v4l2_subdev_init(&vidsw->subdev, &vidsw_subdev_ops);
+ vidsw->subdev.internal_ops = &vidsw_internal_ops;
+ snprintf(vidsw->subdev.name, sizeof(vidsw->subdev.name), "%s",
+ np->name);
+ vidsw->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ vidsw->subdev.dev = &pdev->dev;
+ vidsw->dev = &pdev->dev;
+ vidsw->active = -1;
+
+ num_pads = of_get_child_count(np);
+ if (num_pads < 2) {
+ dev_err(&pdev->dev, "Not enough ports %d\n", num_pads);
+ return -EINVAL;
+ }
+
+ ret = of_get_reg_field(np, &field);
+ if (ret == 0) {
+ map = syscon_node_to_regmap(np->parent);
+ if (!map) {
+ dev_err(&pdev->dev, "Failed to get syscon register
map\n");
+ return PTR_ERR(map);
+ }
+
+ vidsw->field = devm_regmap_field_alloc(&pdev->dev, map, field);
+ if (IS_ERR(vidsw->field)) {
+ dev_err(&pdev->dev, "Failed to allocate regmap
field\n");
+ return PTR_ERR(vidsw->field);
+ }
+ } else {
+ vidsw->gpio = of_get_named_gpio_flags(np, "gpios", 0,
+ NULL);
+ ret = gpio_request_one(vidsw->gpio,
+ GPIOF_OUT_INIT_LOW, np->name);
+ if (ret < 0) {
+ dev_warn(&pdev->dev,
+ "could not request control gpio %d: %d\n",
+ vidsw->gpio, ret);
+ vidsw->gpio = -1;
+ }
+ }
+
+ ret = vidsw_async_init(vidsw, np);
+ if (ret)
+ return ret;
+
+ ret = v4l2_async_register_subdev(&vidsw->subdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int vidsw_remove(struct platform_device *pdev)
+{
+ /* FIXME */
+
+ return -EBUSY;
+}
+
+static const struct of_device_id vidsw_dt_ids[] = {
+ { .compatible = "video-multiplexer", },
+ { /* sentinel */ }
+};
+
+static struct platform_driver vidsw_driver = {
+ .probe = vidsw_probe,
+ .remove = vidsw_remove,
+ .driver = {
+ .of_match_table = vidsw_dt_ids,
+ .name = "video-multiplexer",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(vidsw_driver);
+
+MODULE_DESCRIPTION("i.MX video stream multiplexer");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
--
2.0.0.rc2
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