drivers/hid/intel-ish-hid/ipc/utils.h

   1 /*
   2  * Utility macros of ISH
   3  *
   4  * Copyright (c) 2014-2016, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  */
  15 #ifndef UTILS__H
  16 #define UTILS__H
  17
  18 #define WAIT_FOR_SEND_SLICE     (HZ / 10)
  19 #define WAIT_FOR_CONNECT_SLICE  (HZ / 10)
  20
  21 /*
  22  * Waits for specified event when a thread that triggers event can't signal
  23  * Also, waits *at_least* `timeinc` after condition is satisfied
  24  */
  25 #define timed_wait_for(timeinc, condition)                      \
  26         do {                                                    \
  27                 int completed = 0;                              \
  28                 do {                                            \
  29                         unsigned long   j;                      \
  30                         int     done = 0;                       \
  31                                                                 \
  32                         completed = (condition);                \
  33                         for (j = jiffies, done = 0; !done; ) {  \
  34                                 schedule_timeout(timeinc);      \
  35                                 if (time_is_before_eq_jiffies(j + timeinc)) \
  36                                         done = 1;               \
  37                         }                                       \
  38                 } while (!(completed));                         \
  39         } while (0)
  40
  41
  42 /*
  43  * Waits for specified event when a thread that triggers event
  44  * can't signal with timeout (use whenever we may hang)
  45  */
  46 #define timed_wait_for_timeout(timeinc, condition, timeout)     \
  47         do {                                                    \
  48                 int     t = timeout;                            \
  49                 do {                                            \
  50                         unsigned long   j;                      \
  51                         int     done = 0;                       \
  52                                                                 \
  53                         for (j = jiffies, done = 0; !done; ) {  \
  54                                 schedule_timeout(timeinc);      \
  55                                 if (time_is_before_eq_jiffies(j + timeinc)) \
  56                                         done = 1;               \
  57                         } \
  58                         t -= timeinc;                           \
  59                         if (t <= 0)                             \
  60                                 break;                          \
  61                 } while (!(condition));                         \
  62         } while (0)
  63
  64 #endif /* UTILS__H */