LXR linux/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
  40static int esi_open(struct sir_dev *);
  41static int esi_close(struct sir_dev *);
  42static int esi_change_speed(struct sir_dev *, unsigned);
  43static int esi_reset(struct sir_dev *);
  44
  45static 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
  55static int __init esi_sir_init(void)
  56{
  57        return irda_register_dongle(&esi);
  58}
  59
  60static void __exit esi_sir_cleanup(void)
  61{
  62        irda_unregister_dongle(&esi);
  63}
  64
  65static 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
  81static 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 */
  96static 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 */
 132static 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
 150MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 151MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
 152MODULE_LICENSE("GPL");
 153MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */
 154
 155module_init(esi_sir_init);
 156module_exit(esi_sir_cleanup);
 157
 158