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

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  63 #ifndef __iwl_notif_wait_h__
  64 #define __iwl_notif_wait_h__
  65
  66 #include <linux/wait.h>
  67
  68 #include "iwl-trans.h"
  69
  70 struct iwl_notif_wait_data {
  71         struct list_head notif_waits;
  72         spinlock_t notif_wait_lock;
  73         wait_queue_head_t notif_waitq;
  74 };
  75
  76 #define MAX_NOTIF_CMDS  5
  77
  78 /**
  79  * struct iwl_notification_wait - notification wait entry
  80  * @list: list head for global list
  81  * @fn: Function called with the notification. If the function
  82  *      returns true, the wait is over, if it returns false then
  83  *      the waiter stays blocked. If no function is given, any
  84  *      of the listed commands will unblock the waiter.
  85  * @cmds: command IDs
  86  * @n_cmds: number of command IDs
  87  * @triggered: waiter should be woken up
  88  * @aborted: wait was aborted
  89  *
  90  * This structure is not used directly, to wait for a
  91  * notification declare it on the stack, and call
  92  * iwlagn_init_notification_wait() with appropriate
  93  * parameters. Then do whatever will cause the ucode
  94  * to notify the driver, and to wait for that then
  95  * call iwlagn_wait_notification().
  96  *
  97  * Each notification is one-shot. If at some point we
  98  * need to support multi-shot notifications (which
  99  * can't be allocated on the stack) we need to modify
 100  * the code for them.
 101  */
 102 struct iwl_notification_wait {
 103         struct list_head list;
 104
 105         bool (*fn)(struct iwl_notif_wait_data *notif_data,
 106                    struct iwl_rx_packet *pkt, void *data);
 107         void *fn_data;
 108
 109         u16 cmds[MAX_NOTIF_CMDS];
 110         u8 n_cmds;
 111         bool triggered, aborted;
 112 };
 113
 114
 115 /* caller functions */
 116 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
 117 void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
 118                                   struct iwl_rx_packet *pkt);
 119 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
 120
 121 /* user functions */
 122 void __acquires(wait_entry)
 123 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
 124                            struct iwl_notification_wait *wait_entry,
 125                            const u16 *cmds, int n_cmds,
 126                            bool (*fn)(struct iwl_notif_wait_data *notif_data,
 127                                       struct iwl_rx_packet *pkt, void *data),
 128                            void *fn_data);
 129
 130 int __must_check __releases(wait_entry)
 131 iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
 132                       struct iwl_notification_wait *wait_entry,
 133                       unsigned long timeout);
 134
 135 void __releases(wait_entry)
 136 iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
 137                         struct iwl_notification_wait *wait_entry);
 138
 139 #endif /* __iwl_notif_wait_h__ */