[IRDA]: Update esr-sir driver.

From Martin Diehl.

* convert to de-virtualized sirdev helpers
* add probably missing dongle power-up operation

drivers/net/irda/esi-sir.c

@@ -68,11 +68,14 @@ static int esi_open(struct sir_dev *dev)
 {
 	struct qos_info *qos = &dev->qos;
 
+	/* Power up and set dongle to 9600 baud */
+	sirdev_set_dtr_rts(dev, FALSE, TRUE);
+
 	qos->baud_rate.bits &= IR_9600|IR_19200|IR_115200;
 	qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
 	irda_qos_bits_to_value(qos);
 
-	/* shouldn't we do set_dtr_rts(FALSE, TRUE) here (power up at 9600)? */
+	/* irda thread waits 50 msec for power settling */
 
 	return 0;
 }
@@ -80,7 +83,7 @@ static int esi_open(struct sir_dev *dev)
 static int esi_close(struct sir_dev *dev)
 {
 	/* Power off dongle */
-	dev->set_dtr_rts(dev, FALSE, FALSE);
+	sirdev_set_dtr_rts(dev, FALSE, FALSE);
 
 	return 0;
 }
@@ -89,10 +92,12 @@ static int esi_close(struct sir_dev *dev)
  * Function esi_change_speed (task)
  *
  * Set the speed for the Extended Systems JetEye PC ESI-9680 type dongle
+ * Apparently (see old esi-driver) no delays are needed here...
  *
  */
 static int esi_change_speed(struct sir_dev *dev, unsigned speed)
 {
+	int ret = 0;
 	int dtr, rts;
 	
 	switch (speed) {
@@ -104,6 +109,7 @@ static int esi_change_speed(struct sir_dev *dev, unsigned speed)
 		dtr = rts = TRUE;
 		break;
 	default:
+		ret = -EINVAL;
 		speed = 9600;
 		/* fall through */
 	case 9600:
@@ -113,12 +119,10 @@ static int esi_change_speed(struct sir_dev *dev, unsigned speed)
 	}
 
 	/* Change speed of dongle */
-	dev->set_dtr_rts(dev, dtr, rts);
+	sirdev_set_dtr_rts(dev, dtr, rts);
 	dev->speed = speed;
 
-	/* do we need some delay for power stabilization? */
-
-	return 0;
+	return ret;
 }
 
 /*
@@ -129,9 +133,18 @@ static int esi_change_speed(struct sir_dev *dev, unsigned speed)
  */
 static int esi_reset(struct sir_dev *dev)
 {
-	dev->set_dtr_rts(dev, FALSE, FALSE);
+	sirdev_set_dtr_rts(dev, FALSE, FALSE);
+
+	/* Hm, the old esi-driver left the dongle unpowered relying on
+	 * the following speed change to repower. This might work for
+	 * the esi because we only need the modem lines. However, now the
+	 * general rule is reset must bring the dongle to some working
+	 * well-known state because speed change might write to registers.
+	 * The old esi-driver didn't any delay here - let's hope it' fine.
+	 */
 
-	/* Hm, probably repower to 9600 and some delays? */
+	sirdev_set_dtr_rts(dev, FALSE, TRUE);
+	dev->speed = 9600;
 
 	return 0;
 }