drivers/net/wireless/iwlwifi/iwl-notif-wait.h

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  62 #ifndef __iwl_notif_wait_h__
  63 #define __iwl_notif_wait_h__
  64
  65 #include <linux/wait.h>
  66
  67 #include "iwl-trans.h"
  68
  69 struct iwl_notif_wait_data {
  70         struct list_head notif_waits;
  71         spinlock_t notif_wait_lock;
  72         wait_queue_head_t notif_waitq;
  73 };
  74
  75 #define MAX_NOTIF_CMDS  5
  76
  77 /**
  78  * struct iwl_notification_wait - notification wait entry
  79  * @list: list head for global list
  80  * @fn: Function called with the notification. If the function
  81  *      returns true, the wait is over, if it returns false then
  82  *      the waiter stays blocked. If no function is given, any
  83  *      of the listed commands will unblock the waiter.
  84  * @cmds: command IDs
  85  * @n_cmds: number of command IDs
  86  * @triggered: waiter should be woken up
  87  * @aborted: wait was aborted
  88  *
  89  * This structure is not used directly, to wait for a
  90  * notification declare it on the stack, and call
  91  * iwlagn_init_notification_wait() with appropriate
  92  * parameters. Then do whatever will cause the ucode
  93  * to notify the driver, and to wait for that then
  94  * call iwlagn_wait_notification().
  95  *
  96  * Each notification is one-shot. If at some point we
  97  * need to support multi-shot notifications (which
  98  * can't be allocated on the stack) we need to modify
  99  * the code for them.
 100  */
 101 struct iwl_notification_wait {
 102         struct list_head list;
 103
 104         bool (*fn)(struct iwl_notif_wait_data *notif_data,
 105                    struct iwl_rx_packet *pkt, void *data);
 106         void *fn_data;
 107
 108         u8 cmds[MAX_NOTIF_CMDS];
 109         u8 n_cmds;
 110         bool triggered, aborted;
 111 };
 112
 113
 114 /* caller functions */
 115 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
 116 void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
 117                                   struct iwl_rx_packet *pkt);
 118 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
 119
 120 /* user functions */
 121 void __acquires(wait_entry)
 122 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
 123                            struct iwl_notification_wait *wait_entry,
 124                            const u8 *cmds, int n_cmds,
 125                            bool (*fn)(struct iwl_notif_wait_data *notif_data,
 126                                       struct iwl_rx_packet *pkt, void *data),
 127                            void *fn_data);
 128
 129 int __must_check __releases(wait_entry)
 130 iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
 131                       struct iwl_notification_wait *wait_entry,
 132                       unsigned long timeout);
 133
 134 void __releases(wait_entry)
 135 iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
 136                         struct iwl_notification_wait *wait_entry);
 137
 138 #endif /* __iwl_notif_wait_h__ */