drivers/net/irda/esi-sir.c

   1 /*********************************************************************
   2  *
   3  * Filename:      esi.c
   4  * Version:       1.6
   5  * Description:   Driver for the Extended Systems JetEye PC dongle
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sat Feb 21 18:54:38 1998
   9  * Modified at:   Sun Oct 27 22:01:04 2002
  10  * Modified by:   Martin Diehl <mad@mdiehl.de>
  11  *
  12  *     Copyright (c) 1999 Dag Brattli, <dagb@cs.uit.no>,
  13  *     Copyright (c) 1998 Thomas Davis, <ratbert@radiks.net>,
  14  *     Copyright (c) 2002 Martin Diehl, <mad@mdiehl.de>,
  15  *     All Rights Reserved.
  16  *
  17  *     This program is free software; you can redistribute it and/or
  18  *     modify it under the terms of the GNU General Public License as
  19  *     published by the Free Software Foundation; either version 2 of
  20  *     the License, or (at your option) any later version.
  21  *
  22  *     This program is distributed in the hope that it will be useful,
  23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  25  *     GNU General Public License for more details.
  26  *
  27  *     You should have received a copy of the GNU General Public License
  28  *     along with this program; if not, write to the Free Software
  29  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  *     MA 02111-1307 USA
  31  *
  32  ********************************************************************/
  33
  34 #include <linux/module.h>
  35 #include <linux/delay.h>
  36 #include <linux/init.h>
  37
  38 #include <net/irda/irda.h>
  39
  40 #include "sir-dev.h"
  41
  42 static int esi_open(struct sir_dev *);
  43 static int esi_close(struct sir_dev *);
  44 static int esi_change_speed(struct sir_dev *, unsigned);
  45 static int esi_reset(struct sir_dev *);
  46
  47 static struct dongle_driver esi = {
  48         .owner          = THIS_MODULE,
  49         .driver_name    = "JetEye PC ESI-9680 PC",
  50         .type           = IRDA_ESI_DONGLE,
  51         .open           = esi_open,
  52         .close          = esi_close,
  53         .reset          = esi_reset,
  54         .set_speed      = esi_change_speed,
  55 };
  56
  57 static int __init esi_sir_init(void)
  58 {
  59         return irda_register_dongle(&esi);
  60 }
  61
  62 static void __exit esi_sir_cleanup(void)
  63 {
  64         irda_unregister_dongle(&esi);
  65 }
  66
  67 static int esi_open(struct sir_dev *dev)
  68 {
  69         struct qos_info *qos = &dev->qos;
  70
  71         /* Power up and set dongle to 9600 baud */
  72         sirdev_set_dtr_rts(dev, FALSE, TRUE);
  73
  74         qos->baud_rate.bits &= IR_9600|IR_19200|IR_115200;
  75         qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
  76         irda_qos_bits_to_value(qos);
  77
  78         /* irda thread waits 50 msec for power settling */
  79
  80         return 0;
  81 }
  82
  83 static int esi_close(struct sir_dev *dev)
  84 {
  85         /* Power off dongle */
  86         sirdev_set_dtr_rts(dev, FALSE, FALSE);
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * Function esi_change_speed (task)
  93  *
  94  * Set the speed for the Extended Systems JetEye PC ESI-9680 type dongle
  95  * Apparently (see old esi-driver) no delays are needed here...
  96  *
  97  */
  98 static int esi_change_speed(struct sir_dev *dev, unsigned speed)
  99 {
 100         int ret = 0;
 101         int dtr, rts;
 102
 103         switch (speed) {
 104         case 19200:
 105                 dtr = TRUE;
 106                 rts = FALSE;
 107                 break;
 108         case 115200:
 109                 dtr = rts = TRUE;
 110                 break;
 111         default:
 112                 ret = -EINVAL;
 113                 speed = 9600;
 114                 /* fall through */
 115         case 9600:
 116                 dtr = FALSE;
 117                 rts = TRUE;
 118                 break;
 119         }
 120
 121         /* Change speed of dongle */
 122         sirdev_set_dtr_rts(dev, dtr, rts);
 123         dev->speed = speed;
 124
 125         return ret;
 126 }
 127
 128 /*
 129  * Function esi_reset (task)
 130  *
 131  *    Reset dongle;
 132  *
 133  */
 134 static int esi_reset(struct sir_dev *dev)
 135 {
 136         sirdev_set_dtr_rts(dev, FALSE, FALSE);
 137
 138         /* Hm, the old esi-driver left the dongle unpowered relying on
 139          * the following speed change to repower. This might work for
 140          * the esi because we only need the modem lines. However, now the
 141          * general rule is reset must bring the dongle to some working
 142          * well-known state because speed change might write to registers.
 143          * The old esi-driver didn't any delay here - let's hope it' fine.
 144          */
 145
 146         sirdev_set_dtr_rts(dev, FALSE, TRUE);
 147         dev->speed = 9600;
 148
 149         return 0;
 150 }
 151
 152 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 153 MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
 154 MODULE_LICENSE("GPL");
 155 MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */
 156
 157 module_init(esi_sir_init);
 158 module_exit(esi_sir_cleanup);
 159