/******************************************************************************
 *
 * 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * 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
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 * General Public License for more details.
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 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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 *****************************************************************************/
#ifndef __iwl_op_mode_h__
#define __iwl_op_mode_h__

#include <linux/netdevice.h>
#include <linux/debugfs.h>

struct iwl_op_mode;
struct iwl_trans;
struct sk_buff;
struct iwl_device_cmd;
struct iwl_rx_cmd_buffer;
struct iwl_fw;
struct iwl_cfg;

/**
 * DOC: Operational mode - what is it ?
 *
 * The operational mode (a.k.a. op_mode) is the layer that implements
 * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
 * the transport API to access the HW. The op_mode doesn't need to know how the
 * underlying HW works, since the transport layer takes care of that.
 *
 * There can be several op_mode: i.e. different fw APIs will require two
 * different op_modes. This is why the op_mode is virtualized.
 */

/**
 * DOC: Life cycle of the Operational mode
 *
 * The operational mode has a very simple life cycle.
 *
 *	1) The driver layer (iwl-drv.c) chooses the op_mode based on the
 *	   capabilities advertised by the fw file (in TLV format).
 *	2) The driver layer starts the op_mode (ops->start)
 *	3) The op_mode registers mac80211
 *	4) The op_mode is governed by mac80211
 *	5) The driver layer stops the op_mode
 */

/**
 * struct iwl_op_mode_ops - op_mode specific operations
 *
 * The op_mode exports its ops so that external components can start it and
 * interact with it. The driver layer typically calls the start and stop
 * handlers, the transport layer calls the others.
 *
 * All the handlers MUST be implemented
 *
 * @start: start the op_mode. The transport layer is already allocated.
 *	May sleep
 * @stop: stop the op_mode. Must free all the memory allocated.
 *	May sleep
 * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 *	HCMD this Rx responds to. Can't sleep.
 * @napi_add: NAPI initialization. The transport is fully responsible for NAPI,
 *	but the higher layers need to know about it (in particular mac80211 to
 *	to able to call the right NAPI RX functions); this function is needed
 *	to eventually call netif_napi_add() with higher layer involvement.
 * @queue_full: notifies that a HW queue is full.
 *	Must be atomic and called with BH disabled.
 * @queue_not_full: notifies that a HW queue is not full any more.
 *	Must be atomic and called with BH disabled.
 * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 *	the radio is killed. Return %true if the device should be stopped by
 *	the transport immediately after the call. May sleep.
 * @free_skb: allows the transport layer to free skbs that haven't been
 *	reclaimed by the op_mode. This can happen when the driver is freed and
 *	there are Tx packets pending in the transport layer.
 *	Must be atomic
 * @nic_error: error notification. Must be atomic and must be called with BH
 *	disabled.
 * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 *	called with BH disabled.
 * @nic_config: configure NIC, called before firmware is started.
 *	May sleep
 * @wimax_active: invoked when WiMax becomes active. May sleep
 * @enter_d0i3: configure the fw to enter d0i3. return 1 to indicate d0i3
 *	entrance is aborted (e.g. due to held reference). May sleep.
 * @exit_d0i3: configure the fw to exit d0i3. May sleep.
 */
struct iwl_op_mode_ops {
	struct iwl_op_mode *(*start)(struct iwl_trans *trans,
				     const struct iwl_cfg *cfg,
				     const struct iwl_fw *fw,
				     struct dentry *dbgfs_dir);
	void (*stop)(struct iwl_op_mode *op_mode);
	int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
		  struct iwl_device_cmd *cmd);
	void (*napi_add)(struct iwl_op_mode *op_mode,
			 struct napi_struct *napi,
			 struct net_device *napi_dev,
			 int (*poll)(struct napi_struct *, int),
			 int weight);
	void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
	void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
	bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
	void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
	void (*nic_error)(struct iwl_op_mode *op_mode);
	void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
	void (*nic_config)(struct iwl_op_mode *op_mode);
	void (*wimax_active)(struct iwl_op_mode *op_mode);
	int (*enter_d0i3)(struct iwl_op_mode *op_mode);
	int (*exit_d0i3)(struct iwl_op_mode *op_mode);
};

int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
void iwl_opmode_deregister(const char *name);

/**
 * struct iwl_op_mode - operational mode
 * @ops: pointer to its own ops
 *
 * This holds an implementation of the mac80211 / fw API.
 */
struct iwl_op_mode {
	const struct iwl_op_mode_ops *ops;

	char op_mode_specific[0] __aligned(sizeof(void *));
};

static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
{
	might_sleep();
	op_mode->ops->stop(op_mode);
}

static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
				  struct iwl_rx_cmd_buffer *rxb,
				  struct iwl_device_cmd *cmd)
{
	return op_mode->ops->rx(op_mode, rxb, cmd);
}

static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
					  int queue)
{
	op_mode->ops->queue_full(op_mode, queue);
}

static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
					      int queue)
{
	op_mode->ops->queue_not_full(op_mode, queue);
}

static inline bool __must_check
iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
{
	might_sleep();
	return op_mode->ops->hw_rf_kill(op_mode, state);
}

static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
					struct sk_buff *skb)
{
	op_mode->ops->free_skb(op_mode, skb);
}

static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
{
	op_mode->ops->nic_error(op_mode);
}

static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
{
	op_mode->ops->cmd_queue_full(op_mode);
}

static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
{
	might_sleep();
	op_mode->ops->nic_config(op_mode);
}

static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
{
	might_sleep();
	op_mode->ops->wimax_active(op_mode);
}

static inline int iwl_op_mode_enter_d0i3(struct iwl_op_mode *op_mode)
{
	might_sleep();

	if (!op_mode->ops->enter_d0i3)
		return 0;
	return op_mode->ops->enter_d0i3(op_mode);
}

static inline int iwl_op_mode_exit_d0i3(struct iwl_op_mode *op_mode)
{
	might_sleep();

	if (!op_mode->ops->exit_d0i3)
		return 0;
	return op_mode->ops->exit_d0i3(op_mode);
}

static inline void iwl_op_mode_napi_add(struct iwl_op_mode *op_mode,
					struct napi_struct *napi,
					struct net_device *napi_dev,
					int (*poll)(struct napi_struct *, int),
					int weight)
{
	if (!op_mode->ops->napi_add)
		return;
	op_mode->ops->napi_add(op_mode, napi, napi_dev, poll, weight);
}

#endif /* __iwl_op_mode_h__ */