lib/libaudiodriver/liveupdate.c

   1 #include <minix/audio_fw.h>
   2
   3 /* State management variables. */
   4 EXTERN int is_status_msg_expected;
   5 /*
   6  * - From audio_fw.h:
   7  * EXTERN drv_t drv;
   8  * EXTERN sub_dev_t sub_dev[];
   9 */
  10
  11 /* State management helpers */
  12 static int is_read_pending;
  13 static int is_write_pending;
  14 static void load_state_info(void)
  15 {
  16   int i, dma_mode, found_pending;
  17
  18   /* Check if reads or writes are pending. */
  19   is_read_pending = FALSE;
  20   is_write_pending = FALSE;
  21   found_pending = FALSE;
  22   for (i = 0; i < drv.NrOfSubDevices && !found_pending; i++) {
  23       if(sub_dev[i].RevivePending) {
  24           dma_mode = sub_dev[i].DmaMode;
  25
  26           if(dma_mode == DEV_READ_S) {
  27               is_read_pending = TRUE;
  28           }
  29           else if (dma_mode == DEV_WRITE_S){
  30               is_write_pending = TRUE;
  31           }
  32       }
  33
  34       found_pending = (is_read_pending && is_write_pending);
  35   }
  36 }
  37
  38 /* Custom states definition. */
  39 #define AUDIO_STATE_READ_REQUEST_FREE   (SEF_LU_STATE_CUSTOM_BASE + 0)
  40 #define AUDIO_STATE_WRITE_REQUEST_FREE  (SEF_LU_STATE_CUSTOM_BASE + 1)
  41 #define AUDIO_STATE_IS_CUSTOM(s) \
  42   ((s) >= AUDIO_STATE_READ_REQUEST_FREE && (s) <=AUDIO_STATE_WRITE_REQUEST_FREE)
  43
  44 /*===========================================================================*
  45  *                               sef_cb_lu_prepare                           *
  46  *===========================================================================*/
  47 int sef_cb_lu_prepare(int state)
  48 {
  49   int is_ready;
  50
  51   /* Load state information. */
  52   load_state_info();
  53
  54   /* Check if we are ready for the target state. */
  55   is_ready = FALSE;
  56   switch(state) {
  57       /* Standard states. */
  58       case SEF_LU_STATE_REQUEST_FREE:
  59           is_ready = (!is_read_pending && !is_write_pending);
  60       break;
  61
  62       case SEF_LU_STATE_PROTOCOL_FREE:
  63           is_ready = (!is_read_pending && !is_write_pending
  64               && !is_status_msg_expected);
  65       break;
  66
  67       /* Custom states. */
  68       case AUDIO_STATE_READ_REQUEST_FREE:
  69           is_ready = (!is_read_pending);
  70       break;
  71
  72       case AUDIO_STATE_WRITE_REQUEST_FREE:
  73           is_ready = (!is_write_pending);
  74       break;
  75   }
  76
  77   /* Tell SEF if we are ready. */
  78   return is_ready ? OK : ENOTREADY;
  79 }
  80
  81 /*===========================================================================*
  82  *                        sef_cb_lu_state_isvalid                            *
  83  *===========================================================================*/
  84 int sef_cb_lu_state_isvalid(int state)
  85 {
  86   return SEF_LU_STATE_IS_STANDARD(state) || AUDIO_STATE_IS_CUSTOM(state);
  87 }
  88
  89 /*===========================================================================*
  90  *                         sef_cb_lu_state_dump                              *
  91  *===========================================================================*/
  92 void sef_cb_lu_state_dump(int state)
  93 {
  94   /* Load state information. */
  95   load_state_info();
  96
  97   sef_lu_dprint("audio: live update state = %d\n", state);
  98   sef_lu_dprint("audio: is_status_msg_expected = %d\n",
  99       is_status_msg_expected);
 100   sef_lu_dprint("audio: is_read_pending = %d\n", is_read_pending);
 101   sef_lu_dprint("audio: is_write_pending = %d\n", is_write_pending);
 102
 103   sef_lu_dprint("audio: SEF_LU_STATE_WORK_FREE(%d) reached = %d\n",
 104       SEF_LU_STATE_WORK_FREE, TRUE);
 105   sef_lu_dprint("audio: SEF_LU_STATE_REQUEST_FREE(%d) reached = %d\n",
 106       SEF_LU_STATE_REQUEST_FREE, (!is_read_pending && !is_write_pending));
 107   sef_lu_dprint("audio: SEF_LU_STATE_PROTOCOL_FREE(%d) reached = %d\n",
 108       SEF_LU_STATE_PROTOCOL_FREE, (!is_read_pending && !is_write_pending
 109       && !is_status_msg_expected));
 110   sef_lu_dprint("audio: AUDIO_STATE_READ_REQUEST_FREE(%d) reached = %d\n",
 111       AUDIO_STATE_READ_REQUEST_FREE, (!is_read_pending));
 112   sef_lu_dprint("audio: AUDIO_STATE_WRITE_REQUEST_FREE(%d) reached = %d\n",
 113       AUDIO_STATE_WRITE_REQUEST_FREE, (!is_write_pending));
 114 }
 115