/*********************************************************************
   *                
   * Filename:      esi.c
   * Version:       1.6
   * Description:   Driver for the Extended Systems JetEye PC dongle
   * Status:        Experimental.
   * Author:        Dag Brattli <dagb@cs.uit.no>
   * Created at:    Sat Feb 21 18:54:38 1998
   * Modified at:   Sun Oct 27 22:01:04 2002
   * Modified by:   Martin Diehl <mad@mdiehl.de>
   * 
   *     Copyright (c) 1999 Dag Brattli, <dagb@cs.uit.no>,
   *     Copyright (c) 1998 Thomas Davis, <ratbert@radiks.net>,
   *     Copyright (c) 2002 Martin Diehl, <mad@mdiehl.de>,
   *     All Rights Reserved.
   *     
   *     This program is free software; you can redistribute it and/or 
   *     modify it under the terms of the GNU General Public License as 
   *     published by the Free Software Foundation; either version 2 of 
   *     the License, or (at your option) any later version.
   * 
   *     This program is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   *     GNU General Public License for more details.
   * 
   *     You should have received a copy of the GNU General Public License 
   *     along with this program; if not, see <http://www.gnu.org/licenses/>.
   *     
   ********************************************************************/
  
  #include <linux/module.h>
  #include <linux/delay.h>
  #include <linux/init.h>
  
  #include <net/irda/irda.h>
  
  #include "sir-dev.h"
  
  static int esi_open(struct sir_dev *);
  static int esi_close(struct sir_dev *);
  static int esi_change_speed(struct sir_dev *, unsigned);
  static int esi_reset(struct sir_dev *);
  
  static struct dongle_driver esi = {
  	.owner		= THIS_MODULE,
  	.driver_name	= "JetEye PC ESI-9680 PC",
  	.type		= IRDA_ESI_DONGLE,
  	.open		= esi_open,
  	.close		= esi_close,
  	.reset		= esi_reset,
  	.set_speed	= esi_change_speed,
  };
  
  static int __init esi_sir_init(void)
  {
  	return irda_register_dongle(&esi);
  }
  
  static void __exit esi_sir_cleanup(void)
  {
  	irda_unregister_dongle(&esi);
  }
  
  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);
  
  	/* irda thread waits 50 msec for power settling */
  
  	return 0;
  }
  
  static int esi_close(struct sir_dev *dev)
  {
  	/* Power off dongle */
  	sirdev_set_dtr_rts(dev, FALSE, FALSE);
  
  	return 0;
  }
  
  /*
   * 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) {
  	case 19200:
  		dtr = TRUE;
  		rts = FALSE;
  		break;
  	case 115200:
  		dtr = rts = TRUE;
  		break;
  	default:
  		ret = -EINVAL;
  		speed = 9600;
  		/* fall through */
  	case 9600:
  		dtr = FALSE;
  		rts = TRUE;
  		break;
  	}
  
  	/* Change speed of dongle */
  	sirdev_set_dtr_rts(dev, dtr, rts);
  	dev->speed = speed;
  
  	return ret;
  }
  
  /*
   * Function esi_reset (task)
   *
   *    Reset dongle;
   *
   */
  static int esi_reset(struct sir_dev *dev)
  {
  	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.
  	 */
  
  	sirdev_set_dtr_rts(dev, FALSE, TRUE);
  	dev->speed = 9600;
  
  	return 0;
  }
  
  MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
  MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */
  
  module_init(esi_sir_init);
  module_exit(esi_sir_cleanup);