implement rewind for gl847 and gl124

backend/genesys_gl124.c

@@ -2175,12 +2175,51 @@ gl124_end_scan (Genesys_Device * dev, Genesys_Register_Set * reg,
 }
 
 
-/** @brief Moves the slider to the home (top) position slowly
+/** rewind scan
- * */
+ * Move back by the same amount of distance than previous scan.
-#ifndef UNIT_TESTING
+ * @param dev device to rewind
-static
+ * @returns SANE_STATUS_GOOD on success
-#endif
+ */
-  SANE_Status
+GENESYS_STATIC
+SANE_Status gl124_rewind(Genesys_Device * dev)
+{
+  SANE_Status status;
+  uint8_t byte;
+
+  DBGSTART;
+
+  /* set motor reverse */
+  RIE (sanei_genesys_read_register (dev, 0x02, &byte));
+  byte |= 0x04;
+  RIE (sanei_genesys_write_register(dev, 0x02, byte));
+
+  /* and start scan, then wait completion */
+  RIE (gl124_begin_scan (dev, dev->reg, SANE_TRUE));
+  do
+    {
+      usleep(100*1000);
+      RIE (sanei_genesys_read_register (dev, REG100, &byte));
+    }
+  while(byte & REG100_MOTMFLG);
+  RIE (gl124_end_scan (dev, dev->reg, SANE_TRUE));
+
+  /* restore direction */
+  RIE (sanei_genesys_read_register (dev, 0x02, &byte));
+  byte &= 0xfb;
+  RIE (sanei_genesys_write_register(dev, 0x02, byte));
+  DBGCOMPLETED;
+  return SANE_STATUS_GOOD;
+}
+
+
+/** Park head
+ * Moves the slider to the home (top) position slowly
+ * @param dev device to park
+ * @param wait_until_home true to make the function waiting for head
+ * to be home before returning, if fals returne immediately
+ * @returns SANE_STATUS_GOO on success */
+GENESYS_STATIC
+SANE_Status
 gl124_slow_back_home (Genesys_Device * dev, SANE_Bool wait_until_home)
 {
   Genesys_Register_Set local_reg[GENESYS_GL124_MAX_REGS];
@@ -3926,7 +3965,7 @@ static Genesys_Command_Set gl124_cmd_set = {
   gl124_led_calibration,
 
   gl124_slow_back_home,
-  NULL,
+  gl124_rewind,
 
   sanei_genesys_bulk_write_register,
   NULL,

backend/genesys_gl847.c

@@ -1929,10 +1929,50 @@ gl847_end_scan (Genesys_Device * dev, Genesys_Register_Set * reg,
   return status;
 }
 
-/* Moves the slider to the home (top) postion slowly */
+/** rewind scan
-#ifndef UNIT_TESTING
+ * Move back by the same amount of distance than previous scan.
-static
+ * @param dev device to rewind
-#endif
+ * @returns SANE_STATUS_GOOD on success
+ */
+GENESYS_STATIC
+SANE_Status gl847_rewind(Genesys_Device * dev)
+{
+  SANE_Status status;
+  uint8_t byte;
+
+  DBGSTART;
+
+  /* set motor reverse */
+  RIE (sanei_genesys_read_register (dev, 0x02, &byte));
+  byte |= 0x04;
+  RIE (sanei_genesys_write_register(dev, 0x02, byte));
+
+  /* and start scan, then wait completion */
+  RIE (gl847_begin_scan (dev, dev->reg, SANE_TRUE));
+  do
+    {
+      usleep(100*1000);
+      RIE (sanei_genesys_read_register (dev, REG40, &byte));
+    }
+  while(byte & REG40_MOTMFLG);
+  RIE (gl847_end_scan (dev, dev->reg, SANE_TRUE));
+
+  /* restore direction */
+  RIE (sanei_genesys_read_register (dev, 0x02, &byte));
+  byte &= 0xfb;
+  RIE (sanei_genesys_write_register(dev, 0x02, byte));
+
+  DBGCOMPLETED;
+  return SANE_STATUS_GOOD;
+}
+
+/** Park head
+ * Moves the slider to the home (top) position slowly
+ * @param dev device to park
+ * @param wait_until_home true to make the function waiting for head
+ * to be home before returning, if fals returne immediately
+ * @returns SANE_STATUS_GOO on success */
+GENESYS_STATIC
 SANE_Status
 gl847_slow_back_home (Genesys_Device * dev, SANE_Bool wait_until_home)
 {
@@ -3753,7 +3793,7 @@ static Genesys_Command_Set gl847_cmd_set = {
   gl847_led_calibration,
 
   gl847_slow_back_home,
-  NULL,
+  gl847_rewind,
 
   sanei_genesys_bulk_write_register,
   NULL,