// SPDX-License-Identifier: GPL-2.0

  /*

   * Greybus bundles

   *

   * Copyright 2014-2015 Google Inc.
   * Copyright 2014-2015 Linaro Ltd.

   */

  #include <linux/greybus.h>

  #include "greybus_trace.h"

  static ssize_t bundle_class_show(struct device *dev,
  				 struct device_attribute *attr, char *buf)

  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);

  	return sprintf(buf, "0x%02x
  ", bundle->class);

  }

  static DEVICE_ATTR_RO(bundle_class);

  static ssize_t bundle_id_show(struct device *dev,
  			      struct device_attribute *attr, char *buf)
  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);
  
  	return sprintf(buf, "%u
  ", bundle->id);
  }
  static DEVICE_ATTR_RO(bundle_id);

  static ssize_t state_show(struct device *dev, struct device_attribute *attr,
  			  char *buf)
  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);

  	if (!bundle->state)

  		return sprintf(buf, "
  ");
  
  	return sprintf(buf, "%s
  ", bundle->state);
  }
  
  static ssize_t state_store(struct device *dev, struct device_attribute *attr,
  			   const char *buf, size_t size)
  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);
  
  	kfree(bundle->state);

  	bundle->state = kstrdup(buf, GFP_KERNEL);

  	if (!bundle->state)
  		return -ENOMEM;

  	/* Tell userspace that the file contents changed */
  	sysfs_notify(&bundle->dev.kobj, NULL, "state");
  
  	return size;
  }
  static DEVICE_ATTR_RW(state);

  static struct attribute *bundle_attrs[] = {

  	&dev_attr_bundle_class.attr,

  	&dev_attr_bundle_id.attr,

  	&dev_attr_state.attr,

  	NULL,
  };

  ATTRIBUTE_GROUPS(bundle);

  static struct gb_bundle *gb_bundle_find(struct gb_interface *intf,

  					u8 bundle_id)

  {
  	struct gb_bundle *bundle;
  
  	list_for_each_entry(bundle, &intf->bundles, links) {
  		if (bundle->id == bundle_id)
  			return bundle;
  	}
  
  	return NULL;
  }

  static void gb_bundle_release(struct device *dev)

  {

  	struct gb_bundle *bundle = to_gb_bundle(dev);

  	trace_gb_bundle_release(bundle);

  	kfree(bundle->state);

  	kfree(bundle->cport_desc);

  	kfree(bundle);

  }

  #ifdef CONFIG_PM

  static void gb_bundle_disable_all_connections(struct gb_bundle *bundle)
  {
  	struct gb_connection *connection;
  
  	list_for_each_entry(connection, &bundle->connections, bundle_links)
  		gb_connection_disable(connection);
  }
  
  static void gb_bundle_enable_all_connections(struct gb_bundle *bundle)
  {
  	struct gb_connection *connection;
  
  	list_for_each_entry(connection, &bundle->connections, bundle_links)
  		gb_connection_enable(connection);
  }
  
  static int gb_bundle_suspend(struct device *dev)
  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);
  	const struct dev_pm_ops *pm = dev->driver->pm;
  	int ret;
  
  	if (pm && pm->runtime_suspend) {
  		ret = pm->runtime_suspend(&bundle->dev);
  		if (ret)
  			return ret;
  	} else {
  		gb_bundle_disable_all_connections(bundle);
  	}
  
  	ret = gb_control_bundle_suspend(bundle->intf->control, bundle->id);
  	if (ret) {
  		if (pm && pm->runtime_resume)
  			ret = pm->runtime_resume(dev);
  		else
  			gb_bundle_enable_all_connections(bundle);
  
  		return ret;
  	}
  
  	return 0;
  }
  
  static int gb_bundle_resume(struct device *dev)
  {
  	struct gb_bundle *bundle = to_gb_bundle(dev);
  	const struct dev_pm_ops *pm = dev->driver->pm;
  	int ret;
  
  	ret = gb_control_bundle_resume(bundle->intf->control, bundle->id);
  	if (ret)
  		return ret;
  
  	if (pm && pm->runtime_resume) {
  		ret = pm->runtime_resume(dev);
  		if (ret)
  			return ret;
  	} else {
  		gb_bundle_enable_all_connections(bundle);
  	}
  
  	return 0;
  }
  
  static int gb_bundle_idle(struct device *dev)
  {
  	pm_runtime_mark_last_busy(dev);
  	pm_request_autosuspend(dev);
  
  	return 0;
  }
  #endif
  
  static const struct dev_pm_ops gb_bundle_pm_ops = {
  	SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle)
  };

  struct device_type greybus_bundle_type = {
  	.name =		"greybus_bundle",
  	.release =	gb_bundle_release,

  	.pm =		&gb_bundle_pm_ops,

  };

  /*

   * Create a gb_bundle structure to represent a discovered
   * bundle.  Returns a pointer to the new bundle or a null

   * pointer if a failure occurs due to memory exhaustion.
   */

  struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,

  				   u8 class)

  {

  	struct gb_bundle *bundle;

  	if (bundle_id == BUNDLE_ID_NONE) {
  		dev_err(&intf->dev, "can't use bundle id %u
  ", bundle_id);
  		return NULL;
  	}

  	/*
  	 * Reject any attempt to reuse a bundle id.  We initialize
  	 * these serially, so there's no need to worry about keeping
  	 * the interface bundle list locked here.
  	 */
  	if (gb_bundle_find(intf, bundle_id)) {

  		dev_err(&intf->dev, "duplicate bundle id %u
  ", bundle_id);

  		return NULL;
  	}

  	bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);
  	if (!bundle)

  		return NULL;

  	bundle->intf = intf;

  	bundle->id = bundle_id;

  	bundle->class = class;

  	INIT_LIST_HEAD(&bundle->connections);

  	bundle->dev.parent = &intf->dev;

  	bundle->dev.bus = &greybus_bus_type;
  	bundle->dev.type = &greybus_bundle_type;
  	bundle->dev.groups = bundle_groups;

  	bundle->dev.dma_mask = intf->dev.dma_mask;

  	device_initialize(&bundle->dev);

  	dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id);

  	list_add(&bundle->links, &intf->bundles);

  	trace_gb_bundle_create(bundle);

  	return bundle;

  }

  int gb_bundle_add(struct gb_bundle *bundle)
  {
  	int ret;
  
  	ret = device_add(&bundle->dev);
  	if (ret) {
  		dev_err(&bundle->dev, "failed to register bundle: %d
  ", ret);
  		return ret;
  	}

  	trace_gb_bundle_add(bundle);

  	return 0;
  }

  /*

   * Tear down a previously set up bundle.

   */

  void gb_bundle_destroy(struct gb_bundle *bundle)

  {

  	trace_gb_bundle_destroy(bundle);

  	if (device_is_registered(&bundle->dev))
  		device_del(&bundle->dev);

  	list_del(&bundle->links);
  
  	put_device(&bundle->dev);
  }