N900 contains front and back camera, with a switch between the two. This adds support for the swich component. Signed-off-by: Sebastian Reichel Signed-off-by: Ivaylo Dimitrov Signed-off-by: Pavel Machek -- I see this needs dts documentation, anything else than needs to be done? Thanks, Pavel diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig index d944421..0a99e63 100644 --- a/drivers/media/platform/Kconfig +++ b/drivers/media/platform/Kconfig @@ -91,6 +91,16 @@ config VIDEO_OMAP3_DEBUG ---help--- Enable debug messages on OMAP 3 camera controller driver. +config VIDEO_BUS_SWITCH + tristate "Video Bus switch" + depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API + depends on MEDIA_CONTROLLER + depends on OF + ---help--- + Driver for a GPIO controlled video bus switch, which is used to + connect two camera sensors to the same port a the image signal + processor. + config VIDEO_PXA27x tristate "PXA27x Quick Capture Interface driver" depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile index 5b3cb27..a4c9eab 100644 --- a/drivers/media/platform/Makefile +++ b/drivers/media/platform/Makefile @@ -11,6 +11,8 @@ obj-$(CONFIG_VIDEO_MMP_CAMERA) += marvell-ccic/ obj-$(CONFIG_VIDEO_OMAP3) += omap3isp/ obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o +obj-$(CONFIG_VIDEO_BUS_SWITCH) += video-bus-switch.o + obj-$(CONFIG_VIDEO_VIU) += fsl-viu.o obj-$(CONFIG_VIDEO_VIVID) += vivid/ diff --git a/drivers/media/platform/video-bus-switch.c b/drivers/media/platform/video-bus-switch.c new file mode 100644 index 0000000..1a5d944 --- /dev/null +++ b/drivers/media/platform/video-bus-switch.c @@ -0,0 +1,371 @@ +/* + * Generic driver for video bus switches + * + * Copyright (C) 2015 Sebastian Reichel + * + * 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. + */ + +#define DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * TODO: + * isp_subdev_notifier_complete() calls v4l2_device_register_subdev_nodes() + */ + +#define CSI_SWITCH_SUBDEVS 2 +#define CSI_SWITCH_PORTS 3 + +enum vbs_state { + CSI_SWITCH_DISABLED, + CSI_SWITCH_PORT_1, + CSI_SWITCH_PORT_2, +}; + +struct vbs_src_pads { + struct media_entity *src; + int src_pad; +}; + +struct vbs_data { + struct gpio_desc *swgpio; + struct v4l2_subdev subdev; + struct v4l2_async_notifier notifier; + struct media_pad pads[CSI_SWITCH_PORTS]; + struct vbs_src_pads src_pads[CSI_SWITCH_PORTS]; + enum vbs_state state; +}; + +struct vbs_async_subdev { + struct v4l2_subdev *sd; + struct v4l2_async_subdev asd; + u8 port; +}; + +static int vbs_of_parse_nodes(struct device *dev, struct vbs_data *pdata) +{ + struct v4l2_async_notifier *notifier = &pdata->notifier; + struct device_node *node = NULL; + + notifier->subdevs = devm_kcalloc(dev, CSI_SWITCH_SUBDEVS, + sizeof(*notifier->subdevs), GFP_KERNEL); + if (!notifier->subdevs) + return -ENOMEM; + + notifier->num_subdevs = 0; + while (notifier->num_subdevs < CSI_SWITCH_SUBDEVS && + (node = of_graph_get_next_endpoint(dev->of_node, node))) { + struct v4l2_of_endpoint vep; + struct vbs_async_subdev *ssd; + + /* skip first port (connected to isp) */ + v4l2_of_parse_endpoint(node, &vep); + if (vep.base.port == 0) { + struct device_node *ispnode; + + ispnode = of_graph_get_remote_port_parent(node); + if (!ispnode) { + dev_warn(dev, "bad remote port parent\n"); + return -EINVAL; + } + + of_node_put(node); + continue; + } + + ssd = devm_kzalloc(dev, sizeof(*ssd), GFP_KERNEL); + if (!ssd) { + of_node_put(node); + return -ENOMEM; + } + + ssd->port = vep.base.port; + + notifier->subdevs[notifier->num_subdevs] = &ssd->asd; + + ssd->asd.match.of.node = of_graph_get_remote_port_parent(node); + of_node_put(node); + if (!ssd->asd.match.of.node) { + dev_warn(dev, "bad remote port parent\n"); + return -EINVAL; + } + + ssd->asd.match_type = V4L2_ASYNC_MATCH_OF; + notifier->num_subdevs++; + } + + return notifier->num_subdevs; +} + +static int vbs_registered(struct v4l2_subdev *sd) +{ + struct v4l2_device *v4l2_dev = sd->v4l2_dev; + struct vbs_data *pdata; + int err; + + dev_dbg(sd->dev, "registered, init notifier...\n"); + + pdata = v4l2_get_subdevdata(sd); + + err = v4l2_async_notifier_register(v4l2_dev, &pdata->notifier); + if (err) + return err; + + return 0; +} + +static struct v4l2_subdev *vbs_get_remote_subdev(struct v4l2_subdev *sd) +{ + struct vbs_data *pdata = v4l2_get_subdevdata(sd); + struct media_entity *src; + + if (pdata->state == CSI_SWITCH_DISABLED) + return ERR_PTR(-ENXIO); + + src = pdata->src_pads[pdata->state].src; + + return media_entity_to_v4l2_subdev(src); +} + +static int vbs_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 vbs_data *pdata = v4l2_get_subdevdata(sd); + bool enable = flags & MEDIA_LNK_FL_ENABLED; + + if (local->index > CSI_SWITCH_PORTS - 1) + return -ENXIO; + + /* no configuration needed on source port */ + if (local->index == 0) + return 0; + + if (!enable) { + if (local->index == pdata->state) { + pdata->state = CSI_SWITCH_DISABLED; + + /* Make sure we have both cameras enabled */ + gpiod_set_value(pdata->swgpio, 1); + return 0; + } else { + return -EINVAL; + } + } + + /* there can only be one active sink at the same time */ + if (pdata->state != CSI_SWITCH_DISABLED) + return -EBUSY; + + gpiod_set_value(pdata->swgpio, local->index == CSI_SWITCH_PORT_2); + pdata->state = local->index; + + sd = vbs_get_remote_subdev(sd); + if (IS_ERR(sd)) + return PTR_ERR(sd); + + pdata->subdev.ctrl_handler = sd->ctrl_handler; + + return 0; +} + +static int vbs_subdev_notifier_bound(struct v4l2_async_notifier *async, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct vbs_data *pdata = container_of(async, + struct vbs_data, notifier); + struct vbs_async_subdev *ssd = + container_of(asd, struct vbs_async_subdev, asd); + struct media_entity *sink = &pdata->subdev.entity; + struct media_entity *src = &subdev->entity; + int sink_pad = ssd->port; + int src_pad; + + if (sink_pad >= sink->num_pads) { + dev_err(pdata->subdev.dev, "no sink pad in internal entity!\n"); + return -EINVAL; + } + + for (src_pad = 0; src_pad < subdev->entity.num_pads; src_pad++) { + if (subdev->entity.pads[src_pad].flags & MEDIA_PAD_FL_SOURCE) + break; + } + + if (src_pad >= src->num_pads) { + dev_err(pdata->subdev.dev, "no source pad in external entity\n"); + return -EINVAL; + } + + pdata->src_pads[sink_pad].src = src; + pdata->src_pads[sink_pad].src_pad = src_pad; + ssd->sd = subdev; + + return 0; +} + +static int vbs_subdev_notifier_complete(struct v4l2_async_notifier *async) +{ + struct vbs_data *pdata = container_of(async, struct vbs_data, notifier); + struct media_entity *sink = &pdata->subdev.entity; + int sink_pad; + + for (sink_pad = 1; sink_pad < CSI_SWITCH_PORTS; sink_pad++) { + struct media_entity *src = pdata->src_pads[sink_pad].src; + int src_pad = pdata->src_pads[sink_pad].src_pad; + int err; + + err = media_create_pad_link(src, src_pad, sink, sink_pad, 0); + if (err < 0) + return err; + + dev_dbg(pdata->subdev.dev, "create link: %s[%d] -> %s[%d])\n", + src->name, src_pad, sink->name, sink_pad); + } + + return v4l2_device_register_subdev_nodes(pdata->subdev.v4l2_dev); +} + +static int vbs_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct v4l2_subdev *subdev = vbs_get_remote_subdev(sd); + + if (IS_ERR(subdev)) + return PTR_ERR(subdev); + + return v4l2_subdev_call(subdev, video, s_stream, enable); +} + +static const struct v4l2_subdev_internal_ops vbs_internal_ops = { + .registered = &vbs_registered, +}; + +static const struct media_entity_operations vbs_media_ops = { + .link_setup = vbs_link_setup, + .link_validate = v4l2_subdev_link_validate, +}; + +/* subdev video operations */ +static const struct v4l2_subdev_video_ops vbs_video_ops = { + .s_stream = vbs_s_stream, +}; + +static const struct v4l2_subdev_ops vbs_ops = { + .video = &vbs_video_ops, +}; + +static int video_bus_switch_probe(struct platform_device *pdev) +{ + struct vbs_data *pdata; + int err = 0; + + /* platform data */ + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + printk("video-bus-switch: not enough memory\n"); + return -ENOMEM; + } + platform_set_drvdata(pdev, pdata); + + /* switch gpio */ + pdata->swgpio = devm_gpiod_get(&pdev->dev, "switch", GPIOD_OUT_HIGH); + if (IS_ERR(pdata->swgpio)) { + err = PTR_ERR(pdata->swgpio); + dev_err(&pdev->dev, "Failed to request gpio: %d\n", err); + return err; + } + + /* find sub-devices */ + err = vbs_of_parse_nodes(&pdev->dev, pdata); + if (err < 0) { + dev_err(&pdev->dev, "Failed to parse nodes: %d\n", err); + return err; + } + + pdata->state = CSI_SWITCH_DISABLED; + pdata->notifier.bound = vbs_subdev_notifier_bound; + pdata->notifier.complete = vbs_subdev_notifier_complete; + + /* setup subdev */ + pdata->pads[0].flags = MEDIA_PAD_FL_SOURCE; + pdata->pads[1].flags = MEDIA_PAD_FL_SINK; + pdata->pads[2].flags = MEDIA_PAD_FL_SINK; + + v4l2_subdev_init(&pdata->subdev, &vbs_ops); + pdata->subdev.dev = &pdev->dev; + pdata->subdev.owner = pdev->dev.driver->owner; + strncpy(pdata->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE); + v4l2_set_subdevdata(&pdata->subdev, pdata); + pdata->subdev.entity.function = MEDIA_ENT_F_SWITCH; + pdata->subdev.entity.flags |= MEDIA_ENT_F_SWITCH; + pdata->subdev.entity.ops = &vbs_media_ops; + pdata->subdev.internal_ops = &vbs_internal_ops; + err = media_entity_pads_init(&pdata->subdev.entity, CSI_SWITCH_PORTS, + pdata->pads); + if (err < 0) { + dev_err(&pdev->dev, "Failed to init media entity: %d\n", err); + return err; + } + + /* register subdev */ + err = v4l2_async_register_subdev(&pdata->subdev); + if (err < 0) { + dev_err(&pdev->dev, "Failed to register v4l2 subdev: %d\n", err); + media_entity_cleanup(&pdata->subdev.entity); + return err; + } + + dev_info(&pdev->dev, "video-bus-switch registered\n"); + + return 0; +} + +static int video_bus_switch_remove(struct platform_device *pdev) +{ + struct vbs_data *pdata = platform_get_drvdata(pdev); + + v4l2_async_notifier_unregister(&pdata->notifier); + v4l2_async_unregister_subdev(&pdata->subdev); + media_entity_cleanup(&pdata->subdev.entity); + + return 0; +} + +static const struct of_device_id video_bus_switch_of_match[] = { + { .compatible = "video-bus-switch" }, + { }, +}; +MODULE_DEVICE_TABLE(of, video_bus_switch_of_match); + +static struct platform_driver video_bus_switch_driver = { + .driver = { + .name = "video-bus-switch", + .of_match_table = video_bus_switch_of_match, + }, + .probe = video_bus_switch_probe, + .remove = video_bus_switch_remove, +}; + +module_platform_driver(video_bus_switch_driver); + +MODULE_AUTHOR("Sebastian Reichel "); +MODULE_DESCRIPTION("Video Bus Switch"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:video-bus-switch"); -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html