/*
   * Link Layer Control manager
   *
   * Copyright (C) 2012  Intel Corporation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions 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.
   *
   * You should have received a copy of the GNU General Public License

   * along with this program; if not, see <http://www.gnu.org/licenses/>.

   */

  #include <net/nfc/llc.h>

  #include "llc.h"

  static LIST_HEAD(llc_engines);

  
  int nfc_llc_init(void)
  {

  	int r;

  	r = nfc_llc_nop_register();
  	if (r)
  		goto exit;
  
  	r = nfc_llc_shdlc_register();
  	if (r)
  		goto exit;
  
  	return 0;
  
  exit:
  	nfc_llc_exit();
  	return r;

  }

  
  void nfc_llc_exit(void)
  {
  	struct nfc_llc_engine *llc_engine, *n;
  
  	list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) {
  		list_del(&llc_engine->entry);
  		kfree(llc_engine->name);
  		kfree(llc_engine);
  	}
  }

  
  int nfc_llc_register(const char *name, struct nfc_llc_ops *ops)
  {
  	struct nfc_llc_engine *llc_engine;
  
  	llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
  	if (llc_engine == NULL)
  		return -ENOMEM;
  
  	llc_engine->name = kstrdup(name, GFP_KERNEL);
  	if (llc_engine->name == NULL) {
  		kfree(llc_engine);
  		return -ENOMEM;
  	}
  	llc_engine->ops = ops;
  
  	INIT_LIST_HEAD(&llc_engine->entry);

  	list_add_tail(&llc_engine->entry, &llc_engines);

  
  	return 0;
  }

  
  static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
  {
  	struct nfc_llc_engine *llc_engine;
  
  	list_for_each_entry(llc_engine, &llc_engines, entry) {
  		if (strcmp(llc_engine->name, name) == 0)
  			return llc_engine;
  	}
  
  	return NULL;
  }
  
  void nfc_llc_unregister(const char *name)
  {
  	struct nfc_llc_engine *llc_engine;
  
  	llc_engine = nfc_llc_name_to_engine(name);
  	if (llc_engine == NULL)
  		return;
  
  	list_del(&llc_engine->entry);
  	kfree(llc_engine->name);
  	kfree(llc_engine);
  }

  
  struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
  				 xmit_to_drv_t xmit_to_drv,
  				 rcv_to_hci_t rcv_to_hci, int tx_headroom,
  				 int tx_tailroom, llc_failure_t llc_failure)
  {
  	struct nfc_llc_engine *llc_engine;
  	struct nfc_llc *llc;
  
  	llc_engine = nfc_llc_name_to_engine(name);
  	if (llc_engine == NULL)
  		return NULL;
  
  	llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
  	if (llc == NULL)
  		return NULL;
  
  	llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
  					  tx_headroom, tx_tailroom,
  					  &llc->rx_headroom, &llc->rx_tailroom,
  					  llc_failure);
  	if (llc->data == NULL) {
  		kfree(llc);
  		return NULL;
  	}
  	llc->ops = llc_engine->ops;
  
  	return llc;
  }

  
  void nfc_llc_free(struct nfc_llc *llc)
  {
  	llc->ops->deinit(llc);
  	kfree(llc);
  }

  
  inline void nfc_llc_get_rx_head_tail_room(struct nfc_llc *llc, int *rx_headroom,
  					  int *rx_tailroom)
  {
  	*rx_headroom = llc->rx_headroom;
  	*rx_tailroom = llc->rx_tailroom;
  }

  
  inline int nfc_llc_start(struct nfc_llc *llc)
  {
  	return llc->ops->start(llc);
  }

  EXPORT_SYMBOL(nfc_llc_start);

  
  inline int nfc_llc_stop(struct nfc_llc *llc)
  {
  	return llc->ops->stop(llc);
  }

  EXPORT_SYMBOL(nfc_llc_stop);

  
  inline void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
  {
  	llc->ops->rcv_from_drv(llc, skb);
  }

  
  inline int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
  {
  	return llc->ops->xmit_from_hci(llc, skb);
  }

  
  inline void *nfc_llc_get_data(struct nfc_llc *llc)
  {
  	return llc->data;
  }