drivers/log/liveupdate.c

   1 #include "log.h"
   2
   3 /* State management variables. */
   4 #define NR_DEVS     1   /* number of minor devices */
   5 EXTERN struct logdevice logdevices[NR_DEVS];
   6
   7 /* State management helpers. */
   8 PRIVATE int is_read_pending;
   9 PRIVATE int is_select_callback_pending;
  10 PRIVATE void load_state_info(void)
  11 {
  12   int i, found_pending;
  13   struct logdevice *log;
  14
  15   /* Check if reads or select callbacks are pending. */
  16   is_read_pending = FALSE;
  17   is_select_callback_pending = FALSE;
  18   found_pending = FALSE;
  19   for (i = 0; i < NR_DEVS && !found_pending; i++) {
  20       log = &logdevices[i];
  21       if(log->log_proc_nr) {
  22           is_read_pending = TRUE;
  23       }
  24       if(log->log_selected) {
  25           is_select_callback_pending = TRUE;
  26       }
  27
  28       found_pending = (is_read_pending && is_select_callback_pending);
  29   }
  30 }
  31
  32 /* Custom states definition. */
  33 #define LOG_STATE_SELECT_PROTOCOL_FREE  (SEF_LU_STATE_CUSTOM_BASE + 0)
  34 #define LOG_STATE_IS_CUSTOM(s)  ((s) == LOG_STATE_SELECT_PROTOCOL_FREE)
  35
  36 /*===========================================================================*
  37  *                               sef_cb_lu_prepare                           *
  38  *===========================================================================*/
  39 PUBLIC void sef_cb_lu_prepare(int state)
  40 {
  41   int is_ready;
  42
  43   /* Load state information. */
  44   load_state_info();
  45
  46   /* Check if we are ready for the target state. */
  47   is_ready = FALSE;
  48   switch(state) {
  49       /* Standard states. */
  50       case SEF_LU_STATE_REQUEST_FREE:
  51           is_ready = (!is_read_pending);
  52       break;
  53
  54       case SEF_LU_STATE_PROTOCOL_FREE:
  55           is_ready = (!is_read_pending && !is_select_callback_pending);
  56       break;
  57
  58       /* Custom states. */
  59       case LOG_STATE_SELECT_PROTOCOL_FREE:
  60           is_ready = (!is_select_callback_pending);
  61       break;
  62   }
  63
  64   /* Tell SEF if we are ready. */
  65   if(is_ready) {
  66       sef_lu_ready(OK);
  67   }
  68 }
  69
  70 /*===========================================================================*
  71  *                        sef_cb_lu_state_isvalid                            *
  72  *===========================================================================*/
  73 PUBLIC int sef_cb_lu_state_isvalid(int state)
  74 {
  75   return SEF_LU_STATE_IS_STANDARD(state) || LOG_STATE_IS_CUSTOM(state);
  76 }
  77
  78 /*===========================================================================*
  79  *                         sef_cb_lu_state_dump                              *
  80  *===========================================================================*/
  81 PUBLIC void sef_cb_lu_state_dump(int state)
  82 {
  83   /* Load state information. */
  84   load_state_info();
  85
  86   sef_lu_dprint("log: live update state = %d\n", state);
  87   sef_lu_dprint("log: is_read_pending = %d\n", is_read_pending);
  88   sef_lu_dprint("log: is_select_callback_pending = %d\n",
  89       is_select_callback_pending);
  90
  91   sef_lu_dprint("log: SEF_LU_STATE_WORK_FREE(%d) reached = %d\n",
  92       SEF_LU_STATE_WORK_FREE, TRUE);
  93   sef_lu_dprint("log: SEF_LU_STATE_REQUEST_FREE(%d) reached = %d\n",
  94       SEF_LU_STATE_REQUEST_FREE, (!is_read_pending));
  95   sef_lu_dprint("log: SEF_LU_STATE_PROTOCOL_FREE(%d) reached = %d\n",
  96       SEF_LU_STATE_PROTOCOL_FREE, (!is_read_pending
  97       && !is_select_callback_pending));
  98   sef_lu_dprint("log: LOG_STATE_SELECT_PROTOCOL_FREE(%d) reached = %d\n",
  99       LOG_STATE_SELECT_PROTOCOL_FREE, (!is_select_callback_pending));
 100 }
 101