+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/*
+ * Private inline routines...
+ */
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/* 19991030 -sralston
+ * Return absolute SCSI data direction:
+ * 1 = _DATA_OUT
+ * 0 = _DIR_NONE
+ * -1 = _DATA_IN
+ *
+ * Changed: 3-20-2002 pdelaney to use the default data
+ * direction and the defines set up in the
+ * 2.4 kernel series
+ * 1 = _DATA_OUT changed to SCSI_DATA_WRITE (1)
+ * 0 = _DIR_NONE changed to SCSI_DATA_NONE (3)
+ * -1 = _DATA_IN changed to SCSI_DATA_READ (2)
+ * If the direction is unknown, fall through to original code.
+ *
+ * Mid-layer bug fix(): sg interface generates the wrong data
+ * direction in some cases. Set the direction the hard way for
+ * the most common commands.
+ */
+static inline int
+mptscsih_io_direction(Scsi_Cmnd *cmd)
+{
+ switch (cmd->cmnd[0]) {
+ case WRITE_6:
+ case WRITE_10:
+ case WRITE_16:
+ return SCSI_DATA_WRITE;
+ break;
+ case READ_6:
+ case READ_10:
+ case READ_16:
+ return SCSI_DATA_READ;
+ break;
+ }
+
+ if (cmd->sc_data_direction != SCSI_DATA_UNKNOWN)
+ return cmd->sc_data_direction;
+
+ switch (cmd->cmnd[0]) {
+ /* _DATA_OUT commands */
+ case WRITE_6: case WRITE_10: case WRITE_12:
+ case WRITE_16:
+ case WRITE_LONG: case WRITE_SAME: case WRITE_BUFFER:
+ case WRITE_VERIFY: case WRITE_VERIFY_12:
+ case COMPARE: case COPY: case COPY_VERIFY:
+ case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
+ case SEARCH_EQUAL_12: case SEARCH_HIGH_12: case SEARCH_LOW_12:
+ case MODE_SELECT: case MODE_SELECT_10: case LOG_SELECT:
+ case SEND_DIAGNOSTIC: case CHANGE_DEFINITION: case UPDATE_BLOCK:
+ case SET_WINDOW: case MEDIUM_SCAN: case SEND_VOLUME_TAG:
+ case REASSIGN_BLOCKS:
+ case PERSISTENT_RESERVE_OUT:
+ case 0xea:
+ case 0xa3:
+ return SCSI_DATA_WRITE;
+
+ /* No data transfer commands */
+ case SEEK_6: case SEEK_10:
+ case RESERVE: case RELEASE:
+ case TEST_UNIT_READY:
+ case START_STOP:
+ case ALLOW_MEDIUM_REMOVAL:
+ return SCSI_DATA_NONE;
+
+ /* Conditional data transfer commands */
+ case FORMAT_UNIT:
+ if (cmd->cmnd[1] & 0x10) /* FmtData (data out phase)? */
+ return SCSI_DATA_WRITE;
+ else
+ return SCSI_DATA_NONE;
+
+ case VERIFY:
+ if (cmd->cmnd[1] & 0x02) /* VERIFY:BYTCHK (data out phase)? */
+ return SCSI_DATA_WRITE;
+ else
+ return SCSI_DATA_NONE;
+
+ case RESERVE_10:
+ if (cmd->cmnd[1] & 0x03) /* RESERVE:{LongID|Extent} (data out phase)? */
+ return SCSI_DATA_WRITE;
+ else
+ return SCSI_DATA_NONE;
+
+ /* Must be data _IN! */
+ default:
+ return SCSI_DATA_READ;
+ }
+} /* mptscsih_io_direction() */
+