116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
#include <minix/audio_fw.h>
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/* State management variables. */
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EXTERN int is_status_msg_expected;
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/*
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* - From audio_fw.h:
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* EXTERN drv_t drv;
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* EXTERN sub_dev_t sub_dev[];
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*/
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/* State management helpers */
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static int is_read_pending;
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static int is_write_pending;
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static void load_state_info(void)
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{
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int i, dma_mode, found_pending;
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/* Check if reads or writes are pending. */
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is_read_pending = FALSE;
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is_write_pending = FALSE;
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found_pending = FALSE;
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for (i = 0; i < drv.NrOfSubDevices && !found_pending; i++) {
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if(sub_dev[i].RevivePending) {
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dma_mode = sub_dev[i].DmaMode;
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if(dma_mode == DEV_READ_S) {
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is_read_pending = TRUE;
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}
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else if (dma_mode == DEV_WRITE_S){
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is_write_pending = TRUE;
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}
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}
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found_pending = (is_read_pending && is_write_pending);
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}
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}
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/* Custom states definition. */
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#define AUDIO_STATE_READ_REQUEST_FREE (SEF_LU_STATE_CUSTOM_BASE + 0)
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#define AUDIO_STATE_WRITE_REQUEST_FREE (SEF_LU_STATE_CUSTOM_BASE + 1)
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#define AUDIO_STATE_IS_CUSTOM(s) \
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((s) >= AUDIO_STATE_READ_REQUEST_FREE && (s) <=AUDIO_STATE_WRITE_REQUEST_FREE)
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/*===========================================================================*
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* sef_cb_lu_prepare *
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*===========================================================================*/
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int sef_cb_lu_prepare(int state)
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{
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int is_ready;
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/* Load state information. */
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load_state_info();
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/* Check if we are ready for the target state. */
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is_ready = FALSE;
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switch(state) {
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/* Standard states. */
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case SEF_LU_STATE_REQUEST_FREE:
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is_ready = (!is_read_pending && !is_write_pending);
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break;
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case SEF_LU_STATE_PROTOCOL_FREE:
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is_ready = (!is_read_pending && !is_write_pending
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&& !is_status_msg_expected);
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break;
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/* Custom states. */
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case AUDIO_STATE_READ_REQUEST_FREE:
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is_ready = (!is_read_pending);
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break;
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case AUDIO_STATE_WRITE_REQUEST_FREE:
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is_ready = (!is_write_pending);
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break;
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}
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/* Tell SEF if we are ready. */
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return is_ready ? OK : ENOTREADY;
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}
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/*===========================================================================*
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* sef_cb_lu_state_isvalid *
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*===========================================================================*/
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int sef_cb_lu_state_isvalid(int state)
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{
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return SEF_LU_STATE_IS_STANDARD(state) || AUDIO_STATE_IS_CUSTOM(state);
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}
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/*===========================================================================*
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* sef_cb_lu_state_dump *
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*===========================================================================*/
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void sef_cb_lu_state_dump(int state)
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{
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/* Load state information. */
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load_state_info();
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sef_lu_dprint("audio: live update state = %d\n", state);
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sef_lu_dprint("audio: is_status_msg_expected = %d\n",
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is_status_msg_expected);
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sef_lu_dprint("audio: is_read_pending = %d\n", is_read_pending);
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sef_lu_dprint("audio: is_write_pending = %d\n", is_write_pending);
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sef_lu_dprint("audio: SEF_LU_STATE_WORK_FREE(%d) reached = %d\n",
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SEF_LU_STATE_WORK_FREE, TRUE);
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sef_lu_dprint("audio: SEF_LU_STATE_REQUEST_FREE(%d) reached = %d\n",
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SEF_LU_STATE_REQUEST_FREE, (!is_read_pending && !is_write_pending));
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sef_lu_dprint("audio: SEF_LU_STATE_PROTOCOL_FREE(%d) reached = %d\n",
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SEF_LU_STATE_PROTOCOL_FREE, (!is_read_pending && !is_write_pending
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&& !is_status_msg_expected));
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sef_lu_dprint("audio: AUDIO_STATE_READ_REQUEST_FREE(%d) reached = %d\n",
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AUDIO_STATE_READ_REQUEST_FREE, (!is_read_pending));
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sef_lu_dprint("audio: AUDIO_STATE_WRITE_REQUEST_FREE(%d) reached = %d\n",
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AUDIO_STATE_WRITE_REQUEST_FREE, (!is_write_pending));
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}
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