From: Philipp Zabel <p.za...@pengutronix.de>
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>
Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com>
---
drivers/staging/media/imx/capture/Kconfig | 9 +
drivers/staging/media/imx/capture/Makefile | 1 +
.../staging/media/imx/capture/imx-video-switch.c | 348 +++++++++++++++++++++
3 files changed, 358 insertions(+)
create mode 100644 drivers/staging/media/imx/capture/imx-video-switch.c
diff --git a/drivers/staging/media/imx/capture/Kconfig
b/drivers/staging/media/imx/capture/Kconfig
index ac6fce0..ecd09abe 100644
--- a/drivers/staging/media/imx/capture/Kconfig
+++ b/drivers/staging/media/imx/capture/Kconfig
@@ -8,4 +8,13 @@ config IMX_MIPI_CSI2
MIPI CSI-2 Receiver driver support. This driver is required
for sensor drivers with a MIPI CSI2 interface.
+config IMX_VIDEO_SWITCH
+ tristate "i.MX5/6 Video Bus Multiplexer"
+ depends on VIDEO_IMX_CAMERA
+ default y
+ ---help---
+ This driver provides support for the i.MX5/6 internal video bus
+ multiplexer controlled by register bitfields as well as
+ external multiplexers controller by a GPIO.
+
endmenu
diff --git a/drivers/staging/media/imx/capture/Makefile
b/drivers/staging/media/imx/capture/Makefile
index 8961a4f..f17b199 100644
--- a/drivers/staging/media/imx/capture/Makefile
+++ b/drivers/staging/media/imx/capture/Makefile
@@ -4,3 +4,4 @@ imx-camera-objs := imx-camif.o imx-ic-prpenc.o imx-of.o \
obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-camera.o
obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-csi.o
obj-$(CONFIG_IMX_MIPI_CSI2) += mipi-csi2.o
+obj-$(CONFIG_IMX_VIDEO_SWITCH) += imx-video-switch.o
diff --git a/drivers/staging/media/imx/capture/imx-video-switch.c
b/drivers/staging/media/imx/capture/imx-video-switch.c
new file mode 100644
index 0000000..0c86679
--- /dev/null
+++ b/drivers/staging/media/imx/capture/imx-video-switch.c
@@ -0,0 +1,348 @@
+/*
+ * devicetree probed mediacontrol video multiplexer.
+ *
+ * Copyright (C) 2013 Sascha Hauer, Pengutronix
+ * Copyright (c) 2014-2016 Mentor Graphics Inc.
+ *
+ * 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>
+
+struct vidsw {
+ struct device *dev;
+ struct v4l2_subdev subdev;
+#ifdef CONFIG_MEDIA_CONTROLLER
+ struct media_pad *pads;
+#endif
+ struct v4l2_mbus_framefmt *format_mbus;
+ struct v4l2_of_endpoint *endpoint;
+ struct regmap_field *field;
+ unsigned int gpio;
+ int output_pad;
+ int numpads;
+ int active;
+};
+
+#define to_vidsw(sd) container_of(sd, struct vidsw, subdev)
+
+static int vidsw_set_mux(struct vidsw *vidsw, int input_index)
+{
+ if (vidsw->active >= 0) {
+ if (vidsw->active == input_index)
+ return 0;
+ else
+ return -EBUSY;
+ }
+
+ vidsw->active = input_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;
+}
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+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 (!(flags & MEDIA_LNK_FL_ENABLED)) {
+ if (local->index == vidsw->active) {
+ dev_dbg(vidsw->dev, "going inactive\n");
+ vidsw->active = -1;
+ }
+ return 0;
+ }
+
+ return vidsw_set_mux(vidsw, local->index);
+}
+
+static struct media_entity_operations vidsw_ops = {
+ .link_setup = vidsw_link_setup,
+};
+#endif
+
+static int vidsw_s_routing(struct v4l2_subdev *sd, u32 input,
+ u32 output, u32 config)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+ return vidsw_set_mux(vidsw, input);
+}
+
+static int vidsw_async_init(struct vidsw *vidsw, struct device_node *node)
+{
+ struct v4l2_of_endpoint endpoint;
+ struct device_node *epnode;
+ int pad, numpads;
+#ifdef CONFIG_MEDIA_CONTROLLER
+ int ret;
+#endif
+
+ numpads = of_get_child_count(node);
+ if (numpads < 2) {
+ dev_err(vidsw->dev, "Not enough ports %d\n", numpads);
+ return -EINVAL;
+ }
+
+ vidsw->numpads = numpads;
+
+ /*
+ * the last endpoint must define the mux output pad,
+ * the rest are the mux input pads.
+ */
+ vidsw->output_pad = numpads - 1;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ vidsw->pads = devm_kzalloc(vidsw->dev,
+ numpads * sizeof(*vidsw->pads),
+ GFP_KERNEL);
+ if (!vidsw->pads)
+ return -ENOMEM;
+#endif
+
+ vidsw->endpoint = devm_kzalloc(vidsw->dev,
+ numpads * sizeof(*vidsw->endpoint),
+ GFP_KERNEL);
+ if (!vidsw->endpoint)
+ return -ENOMEM;
+
+ vidsw->format_mbus = devm_kzalloc(vidsw->dev,
+ numpads * sizeof(*vidsw->format_mbus),
+ GFP_KERNEL);
+ if (!vidsw->format_mbus)
+ return -ENOMEM;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ vidsw->subdev.entity.ops = &vidsw_ops;
+
+ /* init the pad directions */
+ for (pad = 0; pad < vidsw->output_pad; pad++)
+ vidsw->pads[pad].flags = MEDIA_PAD_FL_SINK;
+ vidsw->pads[vidsw->output_pad].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&vidsw->subdev.entity,
+ vidsw->numpads, vidsw->pads);
+ if (ret < 0)
+ return ret;
+#endif
+
+ epnode = NULL;
+ for (pad = 0; pad < vidsw->numpads; pad++) {
+ epnode = of_graph_get_next_endpoint(node, epnode);
+ if (!epnode)
+ return -EINVAL;
+
+ v4l2_of_parse_endpoint(epnode, &endpoint);
+ vidsw->endpoint[pad] = endpoint;
+ of_node_put(epnode);
+ }
+
+ 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,
+ .s_routing = vidsw_s_routing,
+};
+
+static int vidsw_get_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+ sdformat->format = vidsw->format_mbus[sdformat->pad];
+
+ return 0;
+}
+
+static int vidsw_set_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+ if (sdformat->pad >= vidsw->numpads)
+ return -EINVAL;
+
+ /* Output pad mirrors active input pad, no limitations on input pads */
+ if (sdformat->pad == vidsw->output_pad && vidsw->active >= 0)
+ sdformat->format = vidsw->format_mbus[vidsw->active];
+
+ if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
+ cfg->try_fmt = sdformat->format;
+ else
+ vidsw->format_mbus[sdformat->pad] = sdformat->format;
+
+ 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 reg_bit_mask[2];
+ int ret;
+
+ ret = of_property_read_u32_array(node, "reg", reg_bit_mask, 2);
+ if (ret < 0)
+ return ret;
+
+ field->reg = reg_bit_mask[0];
+ field->lsb = __ffs(reg_bit_mask[1]);
+ field->msb = __fls(reg_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 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);
+ v4l2_set_subdevdata(&vidsw->subdev, &pdev->dev);
+ 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;
+
+ ret = of_get_reg_field(np, &field);
+ if (ret == 0) {
+ map = syscon_regmap_lookup_by_phandle(np, "gpr");
+ 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 = "imx-video-mux", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, vidsw_dt_ids);
+
+static struct platform_driver vidsw_driver = {
+ .probe = vidsw_probe,
+ .remove = vidsw_remove,
+ .driver = {
+ .of_match_table = vidsw_dt_ids,
+ .name = "imx-video-mux",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(vidsw_driver);
+
+MODULE_DESCRIPTION("i.MX video stream multiplexer");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
