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, see <http://www.gnu.org/licenses/>.
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/module.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  35
  36 #include <net/irda/irda.h>
  37
  38 #include "sir-dev.h"
  39
  40 static int esi_open(struct sir_dev *);
  41 static int esi_close(struct sir_dev *);
  42 static int esi_change_speed(struct sir_dev *, unsigned);
  43 static int esi_reset(struct sir_dev *);
  44
  45 static struct dongle_driver esi = {
  46         .owner          = THIS_MODULE,
  47         .driver_name    = "JetEye PC ESI-9680 PC",
  48         .type           = IRDA_ESI_DONGLE,
  49         .open           = esi_open,
  50         .close          = esi_close,
  51         .reset          = esi_reset,
  52         .set_speed      = esi_change_speed,
  53 };
  54
  55 static int __init esi_sir_init(void)
  56 {
  57         return irda_register_dongle(&esi);
  58 }
  59
  60 static void __exit esi_sir_cleanup(void)
  61 {
  62         irda_unregister_dongle(&esi);
  63 }
  64
  65 static int esi_open(struct sir_dev *dev)
  66 {
  67         struct qos_info *qos = &dev->qos;
  68
  69         /* Power up and set dongle to 9600 baud */
  70         sirdev_set_dtr_rts(dev, FALSE, TRUE);
  71
  72         qos->baud_rate.bits &= IR_9600|IR_19200|IR_115200;
  73         qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
  74         irda_qos_bits_to_value(qos);
  75
  76         /* irda thread waits 50 msec for power settling */
  77
  78         return 0;
  79 }
  80
  81 static int esi_close(struct sir_dev *dev)
  82 {
  83         /* Power off dongle */
  84         sirdev_set_dtr_rts(dev, FALSE, FALSE);
  85
  86         return 0;
  87 }
  88
  89 /*
  90  * Function esi_change_speed (task)
  91  *
  92  * Set the speed for the Extended Systems JetEye PC ESI-9680 type dongle
  93  * Apparently (see old esi-driver) no delays are needed here...
  94  *
  95  */
  96 static int esi_change_speed(struct sir_dev *dev, unsigned speed)
  97 {
  98         int ret = 0;
  99         int dtr, rts;
 100
 101         switch (speed) {
 102         case 19200:
 103                 dtr = TRUE;
 104                 rts = FALSE;
 105                 break;
 106         case 115200:
 107                 dtr = rts = TRUE;
 108                 break;
 109         default:
 110                 ret = -EINVAL;
 111                 speed = 9600;
 112                 /* fall through */
 113         case 9600:
 114                 dtr = FALSE;
 115                 rts = TRUE;
 116                 break;
 117         }
 118
 119         /* Change speed of dongle */
 120         sirdev_set_dtr_rts(dev, dtr, rts);
 121         dev->speed = speed;
 122
 123         return ret;
 124 }
 125
 126 /*
 127  * Function esi_reset (task)
 128  *
 129  *    Reset dongle;
 130  *
 131  */
 132 static int esi_reset(struct sir_dev *dev)
 133 {
 134         sirdev_set_dtr_rts(dev, FALSE, FALSE);
 135
 136         /* Hm, the old esi-driver left the dongle unpowered relying on
 137          * the following speed change to repower. This might work for
 138          * the esi because we only need the modem lines. However, now the
 139          * general rule is reset must bring the dongle to some working
 140          * well-known state because speed change might write to registers.
 141          * The old esi-driver didn't any delay here - let's hope it' fine.
 142          */
 143
 144         sirdev_set_dtr_rts(dev, FALSE, TRUE);
 145         dev->speed = 9600;
 146
 147         return 0;
 148 }
 149
 150 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 151 MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
 152 MODULE_LICENSE("GPL");
 153 MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */
 154
 155 module_init(esi_sir_init);
 156 module_exit(esi_sir_cleanup);
 157