Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw

[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-notif-wait.h

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    from this software without specific prior written permission.
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 *****************************************************************************/
#ifndef __iwl_notif_wait_h__
#define __iwl_notif_wait_h__

#include <linux/wait.h>

#include "iwl-trans.h"

struct iwl_notif_wait_data {
	struct list_head notif_waits;
	spinlock_t notif_wait_lock;
	wait_queue_head_t notif_waitq;
};

/**
 * struct iwl_notification_wait - notification wait entry
 * @list: list head for global list
 * @fn: function called with the notification
 * @cmd: command ID
 *
 * This structure is not used directly, to wait for a
 * notification declare it on the stack, and call
 * iwlagn_init_notification_wait() with appropriate
 * parameters. Then do whatever will cause the ucode
 * to notify the driver, and to wait for that then
 * call iwlagn_wait_notification().
 *
 * Each notification is one-shot. If at some point we
 * need to support multi-shot notifications (which
 * can't be allocated on the stack) we need to modify
 * the code for them.
 */
struct iwl_notification_wait {
	struct list_head list;

	void (*fn)(struct iwl_notif_wait_data *notif_data,
		   struct iwl_rx_packet *pkt, void *data);
	void *fn_data;

	u8 cmd;
	bool triggered, aborted;
};


/* caller functions */
void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
				  struct iwl_rx_packet *pkt);
void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);

/* user functions */
void __acquires(wait_entry)
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
			   struct iwl_notification_wait *wait_entry,
			   u8 cmd,
			   void (*fn)(struct iwl_notif_wait_data *notif_data,
				      struct iwl_rx_packet *pkt, void *data),
			   void *fn_data);

int __must_check __releases(wait_entry)
iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
		      struct iwl_notification_wait *wait_entry,
		      unsigned long timeout);

void __releases(wait_entry)
iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
			struct iwl_notification_wait *wait_entry);

#endif /* __iwl_notif_wait_h__ */