lib/libaudiodriver/liveupdate.c

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