97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright (C) 2005-2014 Intel Corporation
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* Copyright (C) 2015-2017 Intel Deutschland GmbH
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*/
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#ifndef __iwl_notif_wait_h__
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#define __iwl_notif_wait_h__
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#include <linux/wait.h>
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#include "iwl-trans.h"
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struct iwl_notif_wait_data {
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struct list_head notif_waits;
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spinlock_t notif_wait_lock;
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wait_queue_head_t notif_waitq;
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};
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#define MAX_NOTIF_CMDS 5
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/**
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* struct iwl_notification_wait - notification wait entry
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* @list: list head for global list
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* @fn: Function called with the notification. If the function
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* returns true, the wait is over, if it returns false then
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* the waiter stays blocked. If no function is given, any
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* of the listed commands will unblock the waiter.
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* @cmds: command IDs
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* @n_cmds: number of command IDs
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* @triggered: waiter should be woken up
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* @aborted: wait was aborted
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*
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* This structure is not used directly, to wait for a
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* notification declare it on the stack, and call
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* iwl_init_notification_wait() with appropriate
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* parameters. Then do whatever will cause the ucode
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* to notify the driver, and to wait for that then
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* call iwl_wait_notification().
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*
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* Each notification is one-shot. If at some point we
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* need to support multi-shot notifications (which
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* can't be allocated on the stack) we need to modify
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* the code for them.
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*/
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struct iwl_notification_wait {
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struct list_head list;
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bool (*fn)(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt, void *data);
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void *fn_data;
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u16 cmds[MAX_NOTIF_CMDS];
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u8 n_cmds;
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bool triggered, aborted;
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};
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/* caller functions */
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void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
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bool iwl_notification_wait(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt);
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void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
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static inline void
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iwl_notification_notify(struct iwl_notif_wait_data *notif_data)
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{
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wake_up_all(¬if_data->notif_waitq);
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}
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static inline void
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iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt)
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{
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if (iwl_notification_wait(notif_data, pkt))
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iwl_notification_notify(notif_data);
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}
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/* user functions */
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void __acquires(wait_entry)
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iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry,
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const u16 *cmds, int n_cmds,
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bool (*fn)(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt, void *data),
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void *fn_data);
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int __must_check __releases(wait_entry)
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iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry,
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unsigned long timeout);
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void __releases(wait_entry)
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iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry);
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#endif /* __iwl_notif_wait_h__ */
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