drivers/media/usb/au0828/au0828-core.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Driver for the Auvitek USB bridge
  *
  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
  */

 #include "au0828.h"
 #include "au8522.h"

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>
 #include <linux/mutex.h>

 /* Due to enum tuner_pad_index */
 #include <media/tuner.h>

 /*
  * 1 = General debug messages
  * 2 = USB handling
  * 4 = I2C related
  * 8 = Bridge related
  * 16 = IR related
  */
 int au0828_debug;
 module_param_named(debug, au0828_debug, int, 0644);
 MODULE_PARM_DESC(debug,
 		 "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");

 static unsigned int disable_usb_speed_check;
 module_param(disable_usb_speed_check, int, 0444);
 MODULE_PARM_DESC(disable_usb_speed_check,
 		 "override min bandwidth requirement of 480M bps");

 #define _AU0828_BULKPIPE 0x03
 #define _BULKPIPESIZE 0xffff

 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 			    u16 index);
 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 	u16 index, unsigned char *cp, u16 size);

 /* USB Direction */
 #define CMD_REQUEST_IN		0x00
 #define CMD_REQUEST_OUT		0x01

 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
 {
 	u8 result = 0;

 	recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
 	dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);

 	return result;
 }

 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
 {
 	dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
 	return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
 }

 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 	u16 index)
 {
 	int status = -ENODEV;

 	if (dev->usbdev) {

 		/* cp must be memory that has been allocated by kmalloc */
 		status = usb_control_msg(dev->usbdev,
 				usb_sndctrlpipe(dev->usbdev, 0),
 				request,
 				USB_DIR_OUT | USB_TYPE_VENDOR |
 					USB_RECIP_DEVICE,
 				value, index, NULL, 0, 1000);

 		status = min(status, 0);

 		if (status < 0) {
 			pr_err("%s() Failed sending control message, error %d.\n",
 				__func__, status);
 		}

 	}

 	return status;
 }

 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 	u16 index, unsigned char *cp, u16 size)
 {
 	int status = -ENODEV;
 	mutex_lock(&dev->mutex);
 	if (dev->usbdev) {
 		status = usb_control_msg(dev->usbdev,
 				usb_rcvctrlpipe(dev->usbdev, 0),
 				request,
 				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 				value, index,
 				dev->ctrlmsg, size, 1000);

 		status = min(status, 0);

 		if (status < 0) {
 			pr_err("%s() Failed receiving control message, error %d.\n",
 				__func__, status);
 		}

 		/* the host controller requires heap allocated memory, which
 		   is why we didn't just pass "cp" into usb_control_msg */
 		memcpy(cp, dev->ctrlmsg, size);
 	}
 	mutex_unlock(&dev->mutex);
 	return status;
 }

 #ifdef CONFIG_MEDIA_CONTROLLER
 static void au0828_media_graph_notify(struct media_entity *new,
 				      void *notify_data);
 #endif

 static void au0828_unregister_media_device(struct au0828_dev *dev)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_device *mdev = dev->media_dev;
 	struct media_entity_notify *notify, *nextp;

 	if (!mdev || !media_devnode_is_registered(mdev->devnode))
 		return;

 	/* Remove au0828 entity_notify callbacks */
 	list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
 		if (notify->notify != au0828_media_graph_notify)
 			continue;
 		media_device_unregister_entity_notify(mdev, notify);
 	}

 	/* clear enable_source, disable_source */
 	mutex_lock(&mdev->graph_mutex);
 	dev->media_dev->source_priv = NULL;
 	dev->media_dev->enable_source = NULL;
 	dev->media_dev->disable_source = NULL;
 	mutex_unlock(&mdev->graph_mutex);

 	media_device_delete(dev->media_dev, KBUILD_MODNAME, THIS_MODULE);
 	dev->media_dev = NULL;
 #endif
 }

 void au0828_usb_release(struct au0828_dev *dev)
 {
 	au0828_unregister_media_device(dev);

 	/* I2C */
 	au0828_i2c_unregister(dev);

 	kfree(dev);
 }

 static void au0828_usb_disconnect(struct usb_interface *interface)
 {
 	struct au0828_dev *dev = usb_get_intfdata(interface);

 	dprintk(1, "%s()\n", __func__);

 	/* there is a small window after disconnect, before
 	   dev->usbdev is NULL, for poll (e.g: IR) try to access
 	   the device and fill the dmesg with error messages.
 	   Set the status so poll routines can check and avoid
 	   access after disconnect.
 	*/
 	set_bit(DEV_DISCONNECTED, &dev->dev_state);

 	au0828_rc_unregister(dev);
 	/* Digital TV */
 	au0828_dvb_unregister(dev);

 	usb_set_intfdata(interface, NULL);
 	mutex_lock(&dev->mutex);
 	dev->usbdev = NULL;
 	mutex_unlock(&dev->mutex);
 	if (au0828_analog_unregister(dev)) {
 		/*
 		 * No need to call au0828_usb_release() if V4L2 is enabled,
 		 * as this is already called via au0828_usb_v4l2_release()
 		 */
 		return;
 	}
 	au0828_usb_release(dev);
 }

 static int au0828_media_device_init(struct au0828_dev *dev,
 				    struct usb_device *udev)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_device *mdev;

 	mdev = media_device_usb_allocate(udev, KBUILD_MODNAME, THIS_MODULE);
 	if (!mdev)
 		return -ENOMEM;

 	dev->media_dev = mdev;
 #endif
 	return 0;
 }

 #ifdef CONFIG_MEDIA_CONTROLLER
 static void au0828_media_graph_notify(struct media_entity *new,
 				      void *notify_data)
 {
 	struct au0828_dev *dev = (struct au0828_dev *) notify_data;
 	int ret;
 	struct media_entity *entity, *mixer = NULL, *decoder = NULL;

 	if (!new) {
 		/*
 		 * Called during au0828 probe time to connect
 		 * entities that were created prior to registering
 		 * the notify handler. Find mixer and decoder.
 		*/
 		media_device_for_each_entity(entity, dev->media_dev) {
 			if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
 				mixer = entity;
 			else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
 				decoder = entity;
 		}
 		goto create_link;
 	}

 	switch (new->function) {
 	case MEDIA_ENT_F_AUDIO_MIXER:
 		mixer = new;
 		if (dev->decoder)
 			decoder = dev->decoder;
 		break;
 	case MEDIA_ENT_F_ATV_DECODER:
 		/* In case, Mixer is added first, find mixer and create link */
 		media_device_for_each_entity(entity, dev->media_dev) {
 			if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
 				mixer = entity;
 		}
 		decoder = new;
 		break;
 	default:
 		break;
 	}

 create_link:
 	if (decoder && mixer) {
 		ret = media_get_pad_index(decoder, false,
 					  PAD_SIGNAL_AUDIO);
 		if (ret >= 0)
 			ret = media_create_pad_link(decoder, ret,
 						    mixer, 0,
 						    MEDIA_LNK_FL_ENABLED);
 		if (ret < 0)
 			dev_err(&dev->usbdev->dev,
 				"Mixer Pad Link Create Error: %d\n", ret);
 	}
 }

 static bool au0828_is_link_shareable(struct media_entity *owner,
 				     struct media_entity *entity)
 {
 	bool shareable = false;

 	/* Tuner link can be shared by audio, video, and VBI */
 	switch (owner->function) {
 	case MEDIA_ENT_F_IO_V4L:
 	case MEDIA_ENT_F_AUDIO_CAPTURE:
 	case MEDIA_ENT_F_IO_VBI:
 		if (entity->function == MEDIA_ENT_F_IO_V4L ||
 		    entity->function == MEDIA_ENT_F_AUDIO_CAPTURE ||
 		    entity->function == MEDIA_ENT_F_IO_VBI)
 			shareable = true;
 		break;
 	case MEDIA_ENT_F_DTV_DEMOD:
 	default:
 		break;
 	}
 	return shareable;
 }

 /* Callers should hold graph_mutex */
 static int au0828_enable_source(struct media_entity *entity,
 				struct media_pipeline *pipe)
 {
 	struct media_entity  *source, *find_source;
 	struct media_entity *sink;
 	struct media_link *link, *found_link = NULL;
 	int ret = 0;
 	struct media_device *mdev = entity->graph_obj.mdev;
 	struct au0828_dev *dev;

 	if (!mdev)
 		return -ENODEV;

 	dev = mdev->source_priv;

 	/*
 	 * For Audio and V4L2 entity, find the link to which decoder
 	 * is the sink. Look for an active link between decoder and
 	 * source (tuner/s-video/Composite), if one exists, nothing
 	 * to do. If not, look for any  active links between source
 	 * and any other entity. If one exists, source is busy. If
 	 * source is free, setup link and start pipeline from source.
 	 * For DVB FE entity, the source for the link is the tuner.
 	 * Check if tuner is available and setup link and start
 	 * pipeline.
 	*/
 	if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
 		sink = entity;
 		find_source = dev->tuner;
 	} else {
 		/* Analog isn't configured or register failed */
 		if (!dev->decoder) {
 			ret = -ENODEV;
 			goto end;
 		}

 		sink = dev->decoder;

 		/*
 		 * Default input is tuner and default input_type
 		 * is AU0828_VMUX_TELEVISION.
 		 *
 		 * There is a problem when s_input is called to
 		 * change the default input. s_input will try to
 		 * enable_source before attempting to change the
 		 * input on the device, and will end up enabling
 		 * default source which is tuner.
 		 *
 		 * Additional logic is necessary in au0828 to detect
 		 * that the input has changed and enable the right
 		 * source. au0828 handles this case in its s_input.
 		 * It will disable the old source and enable the new
 		 * source.
 		 *
 		*/
 		if (dev->input_type == AU0828_VMUX_TELEVISION)
 			find_source = dev->tuner;
 		else if (dev->input_type == AU0828_VMUX_SVIDEO ||
 			 dev->input_type == AU0828_VMUX_COMPOSITE)
 			find_source = &dev->input_ent[dev->input_type];
 		else {
 			/* unknown input - let user select input */
 			ret = 0;
 			goto end;
 		}
 	}

 	/* Is there an active link between sink and source */
 	if (dev->active_link) {
 		if (dev->active_link_owner == entity) {
 			/* This check is necessary to handle multiple
 			 * enable_source calls from v4l_ioctls during
 			 * the course of video/vbi application run-time.
 			*/
 			pr_debug("%s already owns the tuner\n", entity->name);
 			ret = 0;
 			goto end;
 		} else if (au0828_is_link_shareable(dev->active_link_owner,
 			   entity)) {
 			/* Either ALSA or Video own tuner. Sink is the same
 			 * for both. Allow sharing the active link between
 			 * their common source (tuner) and sink (decoder).
 			 * Starting pipeline between sharing entity and sink
 			 * will fail with pipe mismatch, while owner has an
 			 * active pipeline. Switch pipeline ownership from
 			 * user to owner when owner disables the source.
 			 */
 			dev->active_link_shared = true;
 			/* save the user info to use from disable */
 			dev->active_link_user = entity;
 			dev->active_link_user_pipe = pipe;
 			pr_debug("%s owns the tuner %s can share!\n",
 				 dev->active_link_owner->name,
 				 entity->name);
 			ret = 0;
 			goto end;
 		} else {
 			ret = -EBUSY;
 			goto end;
 		}
 	}

 	list_for_each_entry(link, &sink->links, list) {
 		/* Check sink, and source */
 		if (link->sink->entity == sink &&
 		    link->source->entity == find_source) {
 			found_link = link;
 			break;
 		}
 	}

 	if (!found_link) {
 		ret = -ENODEV;
 		goto end;
 	}

 	/* activate link between source and sink and start pipeline */
 	source = found_link->source->entity;
 	ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
 	if (ret) {
 		pr_err("Activate link from %s->%s. Error %d\n",
 			source->name, sink->name, ret);
 		goto end;
 	}

 	ret = __media_pipeline_start(entity, pipe);
 	if (ret) {
 		pr_err("Start Pipeline: %s->%s Error %d\n",
 			source->name, entity->name, ret);
 		ret = __media_entity_setup_link(found_link, 0);
 		if (ret)
 			pr_err("Deactivate link Error %d\n", ret);
 		goto end;
 	}

 	/* save link state to allow audio and video share the link
 	 * and not disable the link while the other is using it.
 	 * active_link_owner is used to deactivate the link.
 	*/
 	dev->active_link = found_link;
 	dev->active_link_owner = entity;
 	dev->active_source = source;
 	dev->active_sink = sink;

 	pr_info("Enabled Source: %s->%s->%s Ret %d\n",
 		 dev->active_source->name, dev->active_sink->name,
 		 dev->active_link_owner->name, ret);
 end:
 	pr_debug("%s end: ent:%s fnc:%d ret %d\n",
 		 __func__, entity->name, entity->function, ret);
 	return ret;
 }

 /* Callers should hold graph_mutex */
 static void au0828_disable_source(struct media_entity *entity)
 {
 	int ret = 0;
 	struct media_device *mdev = entity->graph_obj.mdev;
 	struct au0828_dev *dev;

 	if (!mdev)
 		return;

 	dev = mdev->source_priv;

 	if (!dev->active_link)
 		return;

 	/* link is active - stop pipeline from source
 	 * (tuner/s-video/Composite) to the entity
 	 * When DVB/s-video/Composite owns tuner, it won't be in
 	 * shared state.
 	 */
 	if (dev->active_link->sink->entity == dev->active_sink &&
 	    dev->active_link->source->entity == dev->active_source) {
 		/*
 		 * Prevent video from deactivating link when audio
 		 * has active pipeline and vice versa. In addition
 		 * handle the case when more than one video/vbi
 		 * application is sharing the link.
 		*/
 		bool owner_is_audio = false;

 		if (dev->active_link_owner->function ==
 		    MEDIA_ENT_F_AUDIO_CAPTURE)
 			owner_is_audio = true;

 		if (dev->active_link_shared) {
 			pr_debug("Shared link owner %s user %s %d\n",
 				 dev->active_link_owner->name,
 				 entity->name, dev->users);

 			/* Handle video device users > 1
 			 * When audio owns the shared link with
 			 * more than one video users, avoid
 			 * disabling the source and/or switching
 			 * the owner until the last disable_source
 			 * call from video _close(). Use dev->users to
 			 * determine when to switch/disable.
 			 */
 			if (dev->active_link_owner != entity) {
 				/* video device has users > 1 */
 				if (owner_is_audio && dev->users > 1)
 					return;

 				dev->active_link_user = NULL;
 				dev->active_link_user_pipe = NULL;
 				dev->active_link_shared = false;
 				return;
 			}

 			/* video owns the link and has users > 1 */
 			if (!owner_is_audio && dev->users > 1)
 				return;

 			/* stop pipeline */
 			__media_pipeline_stop(dev->active_link_owner);
 			pr_debug("Pipeline stop for %s\n",
 				dev->active_link_owner->name);

 			ret = __media_pipeline_start(
 					dev->active_link_user,
 					dev->active_link_user_pipe);
 			if (ret) {
 				pr_err("Start Pipeline: %s->%s %d\n",
 					dev->active_source->name,
 					dev->active_link_user->name,
 					ret);
 				goto deactivate_link;
 			}
 			/* link user is now the owner */
 			dev->active_link_owner = dev->active_link_user;
 			dev->active_link_user = NULL;
 			dev->active_link_user_pipe = NULL;
 			dev->active_link_shared = false;

 			pr_debug("Pipeline started for %s\n",
 				dev->active_link_owner->name);
 			return;
 		} else if (!owner_is_audio && dev->users > 1)
 			/* video/vbi owns the link and has users > 1 */
 			return;

 		if (dev->active_link_owner != entity)
 			return;

 		/* stop pipeline */
 		__media_pipeline_stop(dev->active_link_owner);
 		pr_debug("Pipeline stop for %s\n",
 			dev->active_link_owner->name);

 deactivate_link:
 		ret = __media_entity_setup_link(dev->active_link, 0);
 		if (ret)
 			pr_err("Deactivate link Error %d\n", ret);

 		pr_info("Disabled Source: %s->%s->%s Ret %d\n",
 			 dev->active_source->name, dev->active_sink->name,
 			 dev->active_link_owner->name, ret);

 		dev->active_link = NULL;
 		dev->active_link_owner = NULL;
 		dev->active_source = NULL;
 		dev->active_sink = NULL;
 		dev->active_link_shared = false;
 		dev->active_link_user = NULL;
 	}
 }
 #endif

 static int au0828_media_device_register(struct au0828_dev *dev,
 					struct usb_device *udev)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER
 	int ret;
 	struct media_entity *entity, *demod = NULL;
 	struct media_link *link;

 	if (!dev->media_dev)
 		return 0;

 	if (!media_devnode_is_registered(dev->media_dev->devnode)) {

 		/* register media device */
 		ret = media_device_register(dev->media_dev);
 		if (ret) {
 			media_device_delete(dev->media_dev, KBUILD_MODNAME,
 					    THIS_MODULE);
 			dev->media_dev = NULL;
 			dev_err(&udev->dev,
 				"Media Device Register Error: %d\n", ret);
 			return ret;
 		}
 	} else {
 		/*
 		 * Call au0828_media_graph_notify() to connect
 		 * audio graph to our graph. In this case, audio
 		 * driver registered the device and there is no
 		 * entity_notify to be called when new entities
 		 * are added. Invoke it now.
 		*/
 		au0828_media_graph_notify(NULL, (void *) dev);
 	}

 	/*
 	 * Find tuner, decoder and demod.
 	 *
 	 * The tuner and decoder should be cached, as they'll be used by
 	 *	au0828_enable_source.
 	 *
 	 * It also needs to disable the link between tuner and
 	 * decoder/demod, to avoid disable step when tuner is requested
 	 * by video or audio. Note that this step can't be done until dvb
 	 * graph is created during dvb register.
 	*/
 	media_device_for_each_entity(entity, dev->media_dev) {
 		switch (entity->function) {
 		case MEDIA_ENT_F_TUNER:
 			dev->tuner = entity;
 			break;
 		case MEDIA_ENT_F_ATV_DECODER:
 			dev->decoder = entity;
 			break;
 		case MEDIA_ENT_F_DTV_DEMOD:
 			demod = entity;
 			break;
 		}
 	}

 	/* Disable link between tuner->demod and/or tuner->decoder */
 	if (dev->tuner) {
 		list_for_each_entry(link, &dev->tuner->links, list) {
 			if (demod && link->sink->entity == demod)
 				media_entity_setup_link(link, 0);
 			if (dev->decoder && link->sink->entity == dev->decoder)
 				media_entity_setup_link(link, 0);
 		}
 	}

 	/* register entity_notify callback */
 	dev->entity_notify.notify_data = (void *) dev;
 	dev->entity_notify.notify = (void *) au0828_media_graph_notify;
 	ret = media_device_register_entity_notify(dev->media_dev,
 						  &dev->entity_notify);
 	if (ret) {
 		dev_err(&udev->dev,
 			"Media Device register entity_notify Error: %d\n",
 			ret);
 		return ret;
 	}
 	/* set enable_source */
 	mutex_lock(&dev->media_dev->graph_mutex);
 	dev->media_dev->source_priv = (void *) dev;
 	dev->media_dev->enable_source = au0828_enable_source;
 	dev->media_dev->disable_source = au0828_disable_source;
 	mutex_unlock(&dev->media_dev->graph_mutex);
 #endif
 	return 0;
 }

 static int au0828_usb_probe(struct usb_interface *interface,
 	const struct usb_device_id *id)
 {
 	int ifnum;
 	int retval = 0;

 	struct au0828_dev *dev;
 	struct usb_device *usbdev = interface_to_usbdev(interface);

 	ifnum = interface->altsetting->desc.bInterfaceNumber;

 	if (ifnum != 0)
 		return -ENODEV;

 	dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 		le16_to_cpu(usbdev->descriptor.idVendor),
 		le16_to_cpu(usbdev->descriptor.idProduct),
 		ifnum);

 	/*
 	 * Make sure we have 480 Mbps of bandwidth, otherwise things like
 	 * video stream wouldn't likely work, since 12 Mbps is generally
 	 * not enough even for most Digital TV streams.
 	 */
 	if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 		pr_err("au0828: Device initialization failed.\n");
 		pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
 		return -ENODEV;
 	}

 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (dev == NULL) {
 		pr_err("%s() Unable to allocate memory\n", __func__);
 		return -ENOMEM;
 	}

 	mutex_init(&dev->lock);
 	mutex_lock(&dev->lock);
 	mutex_init(&dev->mutex);
 	mutex_init(&dev->dvb.lock);
 	dev->usbdev = usbdev;
 	dev->boardnr = id->driver_info;
 	dev->board = au0828_boards[dev->boardnr];

 	/* Initialize the media controller */
 	retval = au0828_media_device_init(dev, usbdev);
 	if (retval) {
 		pr_err("%s() au0828_media_device_init failed\n",
 		       __func__);
 		mutex_unlock(&dev->lock);
 		kfree(dev);
 		return retval;
 	}

 	retval = au0828_v4l2_device_register(interface, dev);
 	if (retval) {
 		au0828_usb_v4l2_media_release(dev);
 		mutex_unlock(&dev->lock);
 		kfree(dev);
 		return retval;
 	}

 	/* Power Up the bridge */
 	au0828_write(dev, REG_600, 1 << 4);

 	/* Bring up the GPIO's and supporting devices */
 	au0828_gpio_setup(dev);

 	/* I2C */
 	au0828_i2c_register(dev);

 	/* Setup */
 	au0828_card_setup(dev);

 	/*
 	 * Store the pointer to the au0828_dev so it can be accessed in
 	 * au0828_usb_disconnect
 	 */
 	usb_set_intfdata(interface, dev);

 	/* Analog TV */
 	retval = au0828_analog_register(dev, interface);
 	if (retval) {
 		pr_err("%s() au0828_analog_register failed to register on V4L2\n",
 			__func__);
 		mutex_unlock(&dev->lock);
 		goto done;
 	}

 	/* Digital TV */
 	retval = au0828_dvb_register(dev);
 	if (retval)
 		pr_err("%s() au0828_dvb_register failed\n",
 		       __func__);

 	/* Remote controller */
 	au0828_rc_register(dev);

 	pr_info("Registered device AU0828 [%s]\n",
 		dev->board.name == NULL ? "Unset" : dev->board.name);

 	mutex_unlock(&dev->lock);

 	retval = au0828_media_device_register(dev, usbdev);

 done:
 	if (retval < 0)
 		au0828_usb_disconnect(interface);

 	return retval;
 }

 static int au0828_suspend(struct usb_interface *interface,
 				pm_message_t message)
 {
 	struct au0828_dev *dev = usb_get_intfdata(interface);

 	if (!dev)
 		return 0;

 	pr_info("Suspend\n");

 	au0828_rc_suspend(dev);
 	au0828_v4l2_suspend(dev);
 	au0828_dvb_suspend(dev);

 	/* FIXME: should suspend also ATV/DTV */

 	return 0;
 }

 static int au0828_resume(struct usb_interface *interface)
 {
 	struct au0828_dev *dev = usb_get_intfdata(interface);
 	if (!dev)
 		return 0;

 	pr_info("Resume\n");

 	/* Power Up the bridge */
 	au0828_write(dev, REG_600, 1 << 4);

 	/* Bring up the GPIO's and supporting devices */
 	au0828_gpio_setup(dev);

 	au0828_rc_resume(dev);
 	au0828_v4l2_resume(dev);
 	au0828_dvb_resume(dev);

 	/* FIXME: should resume also ATV/DTV */

 	return 0;
 }

 static struct usb_driver au0828_usb_driver = {
 	.name		= KBUILD_MODNAME,
 	.probe		= au0828_usb_probe,
 	.disconnect	= au0828_usb_disconnect,
 	.id_table	= au0828_usb_id_table,
 	.suspend	= au0828_suspend,
 	.resume		= au0828_resume,
 	.reset_resume	= au0828_resume,
 };

 static int __init au0828_init(void)
 {
 	int ret;

 	if (au0828_debug & 1)
 		pr_info("%s() Debugging is enabled\n", __func__);

 	if (au0828_debug & 2)
 		pr_info("%s() USB Debugging is enabled\n", __func__);

 	if (au0828_debug & 4)
 		pr_info("%s() I2C Debugging is enabled\n", __func__);

 	if (au0828_debug & 8)
 		pr_info("%s() Bridge Debugging is enabled\n",
 		       __func__);

 	if (au0828_debug & 16)
 		pr_info("%s() IR Debugging is enabled\n",
 		       __func__);

 	pr_info("au0828 driver loaded\n");

 	ret = usb_register(&au0828_usb_driver);
 	if (ret)
 		pr_err("usb_register failed, error = %d\n", ret);

 	return ret;
 }

 static void __exit au0828_exit(void)
 {
 	usb_deregister(&au0828_usb_driver);
 }

 module_init(au0828_init);
 module_exit(au0828_exit);

 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 MODULE_LICENSE("GPL");
 MODULE_VERSION("0.0.3");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Driver for the Auvitek USB bridge
	*
	* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
	*/

	#include "au0828.h"
	#include "au8522.h"

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/videodev2.h>
	#include <media/v4l2-common.h>
	#include <linux/mutex.h>

	/* Due to enum tuner_pad_index */
	#include <media/tuner.h>

	/*
	* 1 = General debug messages
	* 2 = USB handling
	* 4 = I2C related
	* 8 = Bridge related
	* 16 = IR related
	*/
	int au0828_debug;
	module_param_named(debug, au0828_debug, int, 0644);
	MODULE_PARM_DESC(debug,
	"set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");

	static unsigned int disable_usb_speed_check;
	module_param(disable_usb_speed_check, int, 0444);
	MODULE_PARM_DESC(disable_usb_speed_check,
	"override min bandwidth requirement of 480M bps");

	#define _AU0828_BULKPIPE 0x03
	#define _BULKPIPESIZE 0xffff

	static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
	u16 index);
	static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
	u16 index, unsigned char *cp, u16 size);

	/* USB Direction */
	#define CMD_REQUEST_IN 0x00
	#define CMD_REQUEST_OUT 0x01

	u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
	{
	u8 result = 0;

	recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
	dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);

	return result;
	}

	u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
	{
	dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
	return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
	}

	static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
	u16 index)
	{
	int status = -ENODEV;

	if (dev->usbdev) {

	/* cp must be memory that has been allocated by kmalloc */
	status = usb_control_msg(dev->usbdev,
	usb_sndctrlpipe(dev->usbdev, 0),
	request,
	USB_DIR_OUT \| USB_TYPE_VENDOR \|
	USB_RECIP_DEVICE,
	value, index, NULL, 0, 1000);

	status = min(status, 0);

	if (status < 0) {
	pr_err("%s() Failed sending control message, error %d.\n",
	__func__, status);
	}

	}

	return status;
	}

	static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
	u16 index, unsigned char *cp, u16 size)
	{
	int status = -ENODEV;
	mutex_lock(&dev->mutex);
	if (dev->usbdev) {
	status = usb_control_msg(dev->usbdev,
	usb_rcvctrlpipe(dev->usbdev, 0),
	request,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, index,
	dev->ctrlmsg, size, 1000);

	status = min(status, 0);

	if (status < 0) {
	pr_err("%s() Failed receiving control message, error %d.\n",
	__func__, status);
	}

	/* the host controller requires heap allocated memory, which
	is why we didn't just pass "cp" into usb_control_msg */
	memcpy(cp, dev->ctrlmsg, size);
	}
	mutex_unlock(&dev->mutex);
	return status;
	}

	#ifdef CONFIG_MEDIA_CONTROLLER
	static void au0828_media_graph_notify(struct media_entity *new,
	void *notify_data);
	#endif

	static void au0828_unregister_media_device(struct au0828_dev *dev)
	{
	#ifdef CONFIG_MEDIA_CONTROLLER
	struct media_device *mdev = dev->media_dev;
	struct media_entity_notify notify, nextp;

	if (!mdev \|\| !media_devnode_is_registered(mdev->devnode))
	return;

	/* Remove au0828 entity_notify callbacks */
	list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
	if (notify->notify != au0828_media_graph_notify)
	continue;
	media_device_unregister_entity_notify(mdev, notify);
	}

	/* clear enable_source, disable_source */
	mutex_lock(&mdev->graph_mutex);
	dev->media_dev->source_priv = NULL;
	dev->media_dev->enable_source = NULL;
	dev->media_dev->disable_source = NULL;
	mutex_unlock(&mdev->graph_mutex);

	media_device_delete(dev->media_dev, KBUILD_MODNAME, THIS_MODULE);
	dev->media_dev = NULL;
	#endif
	}

	void au0828_usb_release(struct au0828_dev *dev)
	{
	au0828_unregister_media_device(dev);

	/* I2C */
	au0828_i2c_unregister(dev);

	kfree(dev);
	}

	static void au0828_usb_disconnect(struct usb_interface *interface)
	{
	struct au0828_dev *dev = usb_get_intfdata(interface);

	dprintk(1, "%s()\n", __func__);

	/* there is a small window after disconnect, before
	dev->usbdev is NULL, for poll (e.g: IR) try to access
	the device and fill the dmesg with error messages.
	Set the status so poll routines can check and avoid
	access after disconnect.
	*/
	set_bit(DEV_DISCONNECTED, &dev->dev_state);

	au0828_rc_unregister(dev);
	/* Digital TV */
	au0828_dvb_unregister(dev);

	usb_set_intfdata(interface, NULL);
	mutex_lock(&dev->mutex);
	dev->usbdev = NULL;
	mutex_unlock(&dev->mutex);
	if (au0828_analog_unregister(dev)) {
	/*
	* No need to call au0828_usb_release() if V4L2 is enabled,
	* as this is already called via au0828_usb_v4l2_release()
	*/
	return;
	}
	au0828_usb_release(dev);
	}

	static int au0828_media_device_init(struct au0828_dev *dev,
	struct usb_device *udev)
	{
	#ifdef CONFIG_MEDIA_CONTROLLER
	struct media_device *mdev;

	mdev = media_device_usb_allocate(udev, KBUILD_MODNAME, THIS_MODULE);
	if (!mdev)
	return -ENOMEM;

	dev->media_dev = mdev;
	#endif
	return 0;
	}

	#ifdef CONFIG_MEDIA_CONTROLLER
	static void au0828_media_graph_notify(struct media_entity *new,
	void *notify_data)
	{
	struct au0828_dev dev = (struct au0828_dev ) notify_data;
	int ret;
	struct media_entity entity, mixer = NULL, *decoder = NULL;

	if (!new) {
	/*
	* Called during au0828 probe time to connect
	* entities that were created prior to registering
	* the notify handler. Find mixer and decoder.
	*/
	media_device_for_each_entity(entity, dev->media_dev) {
	if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
	mixer = entity;
	else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
	decoder = entity;
	}
	goto create_link;
	}

	switch (new->function) {
	case MEDIA_ENT_F_AUDIO_MIXER:
	mixer = new;
	if (dev->decoder)
	decoder = dev->decoder;
	break;
	case MEDIA_ENT_F_ATV_DECODER:
	/* In case, Mixer is added first, find mixer and create link */
	media_device_for_each_entity(entity, dev->media_dev) {
	if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
	mixer = entity;
	}
	decoder = new;
	break;
	default:
	break;
	}

	create_link:
	if (decoder && mixer) {
	ret = media_get_pad_index(decoder, false,
	PAD_SIGNAL_AUDIO);
	if (ret >= 0)
	ret = media_create_pad_link(decoder, ret,
	mixer, 0,
	MEDIA_LNK_FL_ENABLED);
	if (ret < 0)
	dev_err(&dev->usbdev->dev,
	"Mixer Pad Link Create Error: %d\n", ret);
	}
	}

	static bool au0828_is_link_shareable(struct media_entity *owner,
	struct media_entity *entity)
	{
	bool shareable = false;

	/* Tuner link can be shared by audio, video, and VBI */
	switch (owner->function) {
	case MEDIA_ENT_F_IO_V4L:
	case MEDIA_ENT_F_AUDIO_CAPTURE:
	case MEDIA_ENT_F_IO_VBI:
	if (entity->function == MEDIA_ENT_F_IO_V4L \|\|
	entity->function == MEDIA_ENT_F_AUDIO_CAPTURE \|\|
	entity->function == MEDIA_ENT_F_IO_VBI)
	shareable = true;
	break;
	case MEDIA_ENT_F_DTV_DEMOD:
	default:
	break;
	}
	return shareable;
	}

	/* Callers should hold graph_mutex */
	static int au0828_enable_source(struct media_entity *entity,
	struct media_pipeline *pipe)
	{
	struct media_entity source, find_source;
	struct media_entity *sink;
	struct media_link link, found_link = NULL;
	int ret = 0;
	struct media_device *mdev = entity->graph_obj.mdev;
	struct au0828_dev *dev;

	if (!mdev)
	return -ENODEV;

	dev = mdev->source_priv;

	/*
	* For Audio and V4L2 entity, find the link to which decoder
	* is the sink. Look for an active link between decoder and
	* source (tuner/s-video/Composite), if one exists, nothing
	* to do. If not, look for any active links between source
	* and any other entity. If one exists, source is busy. If
	* source is free, setup link and start pipeline from source.
	* For DVB FE entity, the source for the link is the tuner.
	* Check if tuner is available and setup link and start
	* pipeline.
	*/
	if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
	sink = entity;
	find_source = dev->tuner;
	} else {
	/* Analog isn't configured or register failed */
	if (!dev->decoder) {
	ret = -ENODEV;
	goto end;
	}

	sink = dev->decoder;

	/*
	* Default input is tuner and default input_type
	* is AU0828_VMUX_TELEVISION.
	*
	* There is a problem when s_input is called to
	* change the default input. s_input will try to
	* enable_source before attempting to change the
	* input on the device, and will end up enabling
	* default source which is tuner.
	*
	* Additional logic is necessary in au0828 to detect
	* that the input has changed and enable the right
	* source. au0828 handles this case in its s_input.
	* It will disable the old source and enable the new
	* source.
	*
	*/
	if (dev->input_type == AU0828_VMUX_TELEVISION)
	find_source = dev->tuner;
	else if (dev->input_type == AU0828_VMUX_SVIDEO \|\|
	dev->input_type == AU0828_VMUX_COMPOSITE)
	find_source = &dev->input_ent[dev->input_type];
	else {
	/* unknown input - let user select input */
	ret = 0;
	goto end;
	}
	}

	/* Is there an active link between sink and source */
	if (dev->active_link) {
	if (dev->active_link_owner == entity) {
	/* This check is necessary to handle multiple
	* enable_source calls from v4l_ioctls during
	* the course of video/vbi application run-time.
	*/
	pr_debug("%s already owns the tuner\n", entity->name);
	ret = 0;
	goto end;
	} else if (au0828_is_link_shareable(dev->active_link_owner,
	entity)) {
	/* Either ALSA or Video own tuner. Sink is the same
	* for both. Allow sharing the active link between
	* their common source (tuner) and sink (decoder).
	* Starting pipeline between sharing entity and sink
	* will fail with pipe mismatch, while owner has an
	* active pipeline. Switch pipeline ownership from
	* user to owner when owner disables the source.
	*/
	dev->active_link_shared = true;
	/* save the user info to use from disable */
	dev->active_link_user = entity;
	dev->active_link_user_pipe = pipe;
	pr_debug("%s owns the tuner %s can share!\n",
	dev->active_link_owner->name,
	entity->name);
	ret = 0;
	goto end;
	} else {
	ret = -EBUSY;
	goto end;
	}
	}

	list_for_each_entry(link, &sink->links, list) {
	/* Check sink, and source */
	if (link->sink->entity == sink &&
	link->source->entity == find_source) {
	found_link = link;
	break;
	}
	}

	if (!found_link) {
	ret = -ENODEV;
	goto end;
	}

	/* activate link between source and sink and start pipeline */
	source = found_link->source->entity;
	ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
	if (ret) {
	pr_err("Activate link from %s->%s. Error %d\n",
	source->name, sink->name, ret);
	goto end;
	}

	ret = __media_pipeline_start(entity, pipe);
	if (ret) {
	pr_err("Start Pipeline: %s->%s Error %d\n",
	source->name, entity->name, ret);
	ret = __media_entity_setup_link(found_link, 0);
	if (ret)
	pr_err("Deactivate link Error %d\n", ret);
	goto end;
	}

	/* save link state to allow audio and video share the link
	* and not disable the link while the other is using it.
	* active_link_owner is used to deactivate the link.
	*/
	dev->active_link = found_link;
	dev->active_link_owner = entity;
	dev->active_source = source;
	dev->active_sink = sink;

	pr_info("Enabled Source: %s->%s->%s Ret %d\n",
	dev->active_source->name, dev->active_sink->name,
	dev->active_link_owner->name, ret);
	end:
	pr_debug("%s end: ent:%s fnc:%d ret %d\n",
	__func__, entity->name, entity->function, ret);
	return ret;
	}

	/* Callers should hold graph_mutex */
	static void au0828_disable_source(struct media_entity *entity)
	{
	int ret = 0;
	struct media_device *mdev = entity->graph_obj.mdev;
	struct au0828_dev *dev;

	if (!mdev)
	return;

	dev = mdev->source_priv;

	if (!dev->active_link)
	return;

	/* link is active - stop pipeline from source
	* (tuner/s-video/Composite) to the entity
	* When DVB/s-video/Composite owns tuner, it won't be in
	* shared state.
	*/
	if (dev->active_link->sink->entity == dev->active_sink &&
	dev->active_link->source->entity == dev->active_source) {
	/*
	* Prevent video from deactivating link when audio
	* has active pipeline and vice versa. In addition
	* handle the case when more than one video/vbi
	* application is sharing the link.
	*/
	bool owner_is_audio = false;

	if (dev->active_link_owner->function ==
	MEDIA_ENT_F_AUDIO_CAPTURE)
	owner_is_audio = true;

	if (dev->active_link_shared) {
	pr_debug("Shared link owner %s user %s %d\n",
	dev->active_link_owner->name,
	entity->name, dev->users);

	/* Handle video device users > 1
	* When audio owns the shared link with
	* more than one video users, avoid
	* disabling the source and/or switching
	* the owner until the last disable_source
	* call from video _close(). Use dev->users to
	* determine when to switch/disable.
	*/
	if (dev->active_link_owner != entity) {
	/* video device has users > 1 */
	if (owner_is_audio && dev->users > 1)
	return;

	dev->active_link_user = NULL;
	dev->active_link_user_pipe = NULL;
	dev->active_link_shared = false;
	return;
	}

	/* video owns the link and has users > 1 */
	if (!owner_is_audio && dev->users > 1)
	return;

	/* stop pipeline */
	__media_pipeline_stop(dev->active_link_owner);
	pr_debug("Pipeline stop for %s\n",
	dev->active_link_owner->name);

	ret = __media_pipeline_start(
	dev->active_link_user,
	dev->active_link_user_pipe);
	if (ret) {
	pr_err("Start Pipeline: %s->%s %d\n",
	dev->active_source->name,
	dev->active_link_user->name,
	ret);
	goto deactivate_link;
	}
	/* link user is now the owner */
	dev->active_link_owner = dev->active_link_user;
	dev->active_link_user = NULL;
	dev->active_link_user_pipe = NULL;
	dev->active_link_shared = false;

	pr_debug("Pipeline started for %s\n",
	dev->active_link_owner->name);
	return;
	} else if (!owner_is_audio && dev->users > 1)
	/* video/vbi owns the link and has users > 1 */
	return;

	if (dev->active_link_owner != entity)
	return;

	/* stop pipeline */
	__media_pipeline_stop(dev->active_link_owner);
	pr_debug("Pipeline stop for %s\n",
	dev->active_link_owner->name);

	deactivate_link:
	ret = __media_entity_setup_link(dev->active_link, 0);
	if (ret)
	pr_err("Deactivate link Error %d\n", ret);

	pr_info("Disabled Source: %s->%s->%s Ret %d\n",
	dev->active_source->name, dev->active_sink->name,
	dev->active_link_owner->name, ret);

	dev->active_link = NULL;
	dev->active_link_owner = NULL;
	dev->active_source = NULL;
	dev->active_sink = NULL;
	dev->active_link_shared = false;
	dev->active_link_user = NULL;
	}
	}
	#endif

	static int au0828_media_device_register(struct au0828_dev *dev,
	struct usb_device *udev)
	{
	#ifdef CONFIG_MEDIA_CONTROLLER
	int ret;
	struct media_entity entity, demod = NULL;
	struct media_link *link;

	if (!dev->media_dev)
	return 0;

	if (!media_devnode_is_registered(dev->media_dev->devnode)) {

	/* register media device */
	ret = media_device_register(dev->media_dev);
	if (ret) {
	media_device_delete(dev->media_dev, KBUILD_MODNAME,
	THIS_MODULE);
	dev->media_dev = NULL;
	dev_err(&udev->dev,
	"Media Device Register Error: %d\n", ret);
	return ret;
	}
	} else {
	/*
	* Call au0828_media_graph_notify() to connect
	* audio graph to our graph. In this case, audio
	* driver registered the device and there is no
	* entity_notify to be called when new entities
	* are added. Invoke it now.
	*/
	au0828_media_graph_notify(NULL, (void *) dev);
	}

	/*
	* Find tuner, decoder and demod.
	*
	* The tuner and decoder should be cached, as they'll be used by
	* au0828_enable_source.
	*
	* It also needs to disable the link between tuner and
	* decoder/demod, to avoid disable step when tuner is requested
	* by video or audio. Note that this step can't be done until dvb
	* graph is created during dvb register.
	*/
	media_device_for_each_entity(entity, dev->media_dev) {
	switch (entity->function) {
	case MEDIA_ENT_F_TUNER:
	dev->tuner = entity;
	break;
	case MEDIA_ENT_F_ATV_DECODER:
	dev->decoder = entity;
	break;
	case MEDIA_ENT_F_DTV_DEMOD:
	demod = entity;
	break;
	}
	}

	/* Disable link between tuner->demod and/or tuner->decoder */
	if (dev->tuner) {
	list_for_each_entry(link, &dev->tuner->links, list) {
	if (demod && link->sink->entity == demod)
	media_entity_setup_link(link, 0);
	if (dev->decoder && link->sink->entity == dev->decoder)
	media_entity_setup_link(link, 0);
	}
	}

	/* register entity_notify callback */
	dev->entity_notify.notify_data = (void *) dev;
	dev->entity_notify.notify = (void *) au0828_media_graph_notify;
	ret = media_device_register_entity_notify(dev->media_dev,
	&dev->entity_notify);
	if (ret) {
	dev_err(&udev->dev,
	"Media Device register entity_notify Error: %d\n",
	ret);
	return ret;
	}
	/* set enable_source */
	mutex_lock(&dev->media_dev->graph_mutex);
	dev->media_dev->source_priv = (void *) dev;
	dev->media_dev->enable_source = au0828_enable_source;
	dev->media_dev->disable_source = au0828_disable_source;
	mutex_unlock(&dev->media_dev->graph_mutex);
	#endif
	return 0;
	}

	static int au0828_usb_probe(struct usb_interface *interface,
	const struct usb_device_id *id)
	{
	int ifnum;
	int retval = 0;

	struct au0828_dev *dev;
	struct usb_device *usbdev = interface_to_usbdev(interface);

	ifnum = interface->altsetting->desc.bInterfaceNumber;

	if (ifnum != 0)
	return -ENODEV;

	dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
	le16_to_cpu(usbdev->descriptor.idVendor),
	le16_to_cpu(usbdev->descriptor.idProduct),
	ifnum);

	/*
	* Make sure we have 480 Mbps of bandwidth, otherwise things like
	* video stream wouldn't likely work, since 12 Mbps is generally
	* not enough even for most Digital TV streams.
	*/
	if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
	pr_err("au0828: Device initialization failed.\n");
	pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
	return -ENODEV;
	}

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL) {
	pr_err("%s() Unable to allocate memory\n", __func__);
	return -ENOMEM;
	}

	mutex_init(&dev->lock);
	mutex_lock(&dev->lock);
	mutex_init(&dev->mutex);
	mutex_init(&dev->dvb.lock);
	dev->usbdev = usbdev;
	dev->boardnr = id->driver_info;
	dev->board = au0828_boards[dev->boardnr];

	/* Initialize the media controller */
	retval = au0828_media_device_init(dev, usbdev);
	if (retval) {
	pr_err("%s() au0828_media_device_init failed\n",
	__func__);
	mutex_unlock(&dev->lock);
	kfree(dev);
	return retval;
	}

	retval = au0828_v4l2_device_register(interface, dev);
	if (retval) {
	au0828_usb_v4l2_media_release(dev);
	mutex_unlock(&dev->lock);
	kfree(dev);
	return retval;
	}

	/* Power Up the bridge */
	au0828_write(dev, REG_600, 1 << 4);

	/* Bring up the GPIO's and supporting devices */
	au0828_gpio_setup(dev);

	/* I2C */
	au0828_i2c_register(dev);

	/* Setup */
	au0828_card_setup(dev);

	/*
	* Store the pointer to the au0828_dev so it can be accessed in
	* au0828_usb_disconnect
	*/
	usb_set_intfdata(interface, dev);

	/* Analog TV */
	retval = au0828_analog_register(dev, interface);
	if (retval) {
	pr_err("%s() au0828_analog_register failed to register on V4L2\n",
	__func__);
	mutex_unlock(&dev->lock);
	goto done;
	}

	/* Digital TV */
	retval = au0828_dvb_register(dev);
	if (retval)
	pr_err("%s() au0828_dvb_register failed\n",
	__func__);

	/* Remote controller */
	au0828_rc_register(dev);

	pr_info("Registered device AU0828 [%s]\n",
	dev->board.name == NULL ? "Unset" : dev->board.name);

	mutex_unlock(&dev->lock);

	retval = au0828_media_device_register(dev, usbdev);

	done:
	if (retval < 0)
	au0828_usb_disconnect(interface);

	return retval;
	}

	static int au0828_suspend(struct usb_interface *interface,
	pm_message_t message)
	{
	struct au0828_dev *dev = usb_get_intfdata(interface);

	if (!dev)
	return 0;

	pr_info("Suspend\n");

	au0828_rc_suspend(dev);
	au0828_v4l2_suspend(dev);
	au0828_dvb_suspend(dev);

	/* FIXME: should suspend also ATV/DTV */

	return 0;
	}

	static int au0828_resume(struct usb_interface *interface)
	{
	struct au0828_dev *dev = usb_get_intfdata(interface);
	if (!dev)
	return 0;

	pr_info("Resume\n");

	/* Power Up the bridge */
	au0828_write(dev, REG_600, 1 << 4);

	/* Bring up the GPIO's and supporting devices */
	au0828_gpio_setup(dev);

	au0828_rc_resume(dev);
	au0828_v4l2_resume(dev);
	au0828_dvb_resume(dev);

	/* FIXME: should resume also ATV/DTV */

	return 0;
	}

	static struct usb_driver au0828_usb_driver = {
	.name = KBUILD_MODNAME,
	.probe = au0828_usb_probe,
	.disconnect = au0828_usb_disconnect,
	.id_table = au0828_usb_id_table,
	.suspend = au0828_suspend,
	.resume = au0828_resume,
	.reset_resume = au0828_resume,
	};

	static int __init au0828_init(void)
	{
	int ret;

	if (au0828_debug & 1)
	pr_info("%s() Debugging is enabled\n", __func__);

	if (au0828_debug & 2)
	pr_info("%s() USB Debugging is enabled\n", __func__);

	if (au0828_debug & 4)
	pr_info("%s() I2C Debugging is enabled\n", __func__);

	if (au0828_debug & 8)
	pr_info("%s() Bridge Debugging is enabled\n",
	__func__);

	if (au0828_debug & 16)
	pr_info("%s() IR Debugging is enabled\n",
	__func__);

	pr_info("au0828 driver loaded\n");

	ret = usb_register(&au0828_usb_driver);
	if (ret)
	pr_err("usb_register failed, error = %d\n", ret);

	return ret;
	}

	static void __exit au0828_exit(void)
	{
	usb_deregister(&au0828_usb_driver);
	}

	module_init(au0828_init);
	module_exit(au0828_exit);

	MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
	MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
	MODULE_LICENSE("GPL");
	MODULE_VERSION("0.0.3");