i386/linux-2.3.21/drivers/net/irda/actisys.c

   1 /*********************************************************************
   2  *
   3  * Filename:      actisys.c
   4  * Version:       0.8
   5  * Description:   Implementation for the ACTiSYS IR-220L and IR-220L+
   6  *                dongles
   7  * Status:        Experimental.
   8  * Author:        Dag Brattli <dagb@cs.uit.no>
   9  * Created at:    Wed Oct 21 20:02:35 1998
  10  * Modified at:   Sat Jun 26 16:57:57 1999
  11  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  12  *
  13  *     Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
  14  *
  15  *     This program is free software; you can redistribute it and/or
  16  *     modify it under the terms of the GNU General Public License as
  17  *     published by the Free Software Foundation; either version 2 of
  18  *     the License, or (at your option) any later version.
  19  *
  20  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  21  *     provide warranty for any of this software. This material is
  22  *     provided "AS-IS" and at no charge.
  23  *
  24  ********************************************************************/
  25
  26 #include <linux/module.h>
  27 #include <linux/delay.h>
  28 #include <linux/tty.h>
  29 #include <linux/sched.h>
  30 #include <linux/init.h>
  31
  32 #include <net/irda/irda.h>
  33 #include <net/irda/irmod.h>
  34 #include <net/irda/irda_device.h>
  35 #include <net/irda/dongle.h>
  36
  37 static void actisys_reset(struct irda_device *dev);
  38 static void actisys_open(struct irda_device *idev, int type);
  39 static void actisys_close(struct irda_device *dev);
  40 static void actisys_change_speed( struct irda_device *dev, __u32 speed);
  41 static void actisys_init_qos(struct irda_device *idev, struct qos_info *qos);
  42
  43 /* These are the baudrates supported */
  44 static __u32 baud_rates[] = { 9600, 19200, 57600, 115200, 38400};
  45
  46 static struct dongle dongle = {
  47         ACTISYS_DONGLE,
  48         actisys_open,
  49         actisys_close,
  50         actisys_reset,
  51         actisys_change_speed,
  52         actisys_init_qos,
  53 };
  54
  55 static struct dongle dongle_plus = {
  56         ACTISYS_PLUS_DONGLE,
  57         actisys_open,
  58         actisys_close,
  59         actisys_reset,
  60         actisys_change_speed,
  61         actisys_init_qos,
  62 };
  63
  64 int __init actisys_init(void)
  65 {
  66         int ret;
  67
  68         ret = irda_device_register_dongle(&dongle);
  69         if (ret < 0)
  70                 return ret;
  71         ret = irda_device_register_dongle(&dongle_plus);
  72         if (ret < 0) {
  73                 irda_device_unregister_dongle(&dongle);
  74                 return ret;
  75         }
  76         return 0;
  77 }
  78
  79 void actisys_cleanup(void)
  80 {
  81         irda_device_unregister_dongle(&dongle);
  82         irda_device_unregister_dongle(&dongle_plus);
  83 }
  84
  85 static void actisys_open(struct irda_device *idev, int type)
  86 {
  87         strcat(idev->description, " <-> actisys");
  88
  89         idev->io.dongle_id = type;
  90         idev->flags |= IFF_DONGLE;
  91
  92         MOD_INC_USE_COUNT;
  93 }
  94
  95 static void actisys_close(struct irda_device *idev)
  96 {
  97         /* Power off dongle */
  98         irda_device_set_dtr_rts(idev, FALSE, FALSE);
  99
 100         MOD_DEC_USE_COUNT;
 101 }
 102
 103 /*
 104  * Function actisys_change_speed (tty, baud)
 105  *
 106  *    Change speed of the ACTiSYS IR-220L and IR-220L+ type IrDA dongles.
 107  *    To cycle through the available baud rates, pulse RTS low for a few
 108  *    ms.
 109  */
 110 static void actisys_change_speed(struct irda_device *idev, __u32 speed)
 111 {
 112         __u32 current_baudrate;
 113         int index = 0;
 114
 115         DEBUG(4, __FUNCTION__ "()\n");
 116
 117         ASSERT(idev != NULL, return;);
 118         ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
 119
 120         current_baudrate = idev->qos.baud_rate.value;
 121
 122         /* Find the correct baudrate index for the currently used baudrate */
 123         while (current_baudrate != baud_rates[index])
 124                 index++;
 125
 126         DEBUG( 4, __FUNCTION__ "(), index=%d\n", index);
 127
 128         /* Cycle through avaiable baudrates until we reach the correct one */
 129         while (current_baudrate != speed) {
 130                 DEBUG(4, __FUNCTION__ "(), current baudrate = %d\n",
 131                       baud_rates[index]);
 132
 133                 /* Set DTR, clear RTS */
 134                 irda_device_set_dtr_rts(idev, TRUE, FALSE);
 135
 136                 /* Wait at a few ms */
 137                 current->state = TASK_INTERRUPTIBLE;
 138                 schedule_timeout(MSECS_TO_JIFFIES(20));
 139
 140                 /* Set DTR, Set RTS */
 141                 irda_device_set_dtr_rts(idev, TRUE, TRUE);
 142
 143                 /* Wait at a few ms again */
 144                 current->state = TASK_INTERRUPTIBLE;
 145                 schedule_timeout(MSECS_TO_JIFFIES(20));
 146
 147                 /* Go to next baudrate */
 148                 if (idev->io.dongle_id == ACTISYS_DONGLE)
 149                         index = (index+1) % 4; /* IR-220L */
 150                 else
 151                         index = (index+1) % 5; /* IR-220L+ */
 152
 153                 current_baudrate = baud_rates[index];
 154         }
 155         DEBUG(4, __FUNCTION__ "(), current baudrate = %d\n", baud_rates[index]);
 156 }
 157
 158 /*
 159  * Function actisys_reset (dev)
 160  *
 161  *      Reset the Actisys type dongle. Warning, this function must only be
 162  *      called with a process context!
 163  *
 164  *      1. Clear DTR for a few ms.
 165  *
 166  */
 167 static void actisys_reset(struct irda_device *idev)
 168 {
 169         ASSERT(idev != NULL, return;);
 170         ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
 171
 172         /* Clear DTR */
 173         irda_device_set_dtr_rts(idev, FALSE, TRUE);
 174
 175         /* Sleep 10-20 ms*/
 176         current->state = TASK_INTERRUPTIBLE;
 177         schedule_timeout(MSECS_TO_JIFFIES(20));
 178
 179         /* Go back to normal mode */
 180         irda_device_set_dtr_rts(idev, TRUE, TRUE);
 181
 182         idev->qos.baud_rate.value = 9600;
 183 }
 184
 185 /*
 186  * Function actisys_init_qos (qos)
 187  *
 188  *    Initialize QoS capabilities
 189  *
 190  */
 191 static void actisys_init_qos(struct irda_device *idev, struct qos_info *qos)
 192 {
 193         qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 194
 195         /* Remove support for 38400 if this is not a 220L+ dongle */
 196         if (idev->io.dongle_id == ACTISYS_DONGLE)
 197                 qos->baud_rate.bits &= ~IR_38400;
 198
 199         qos->min_turn_time.bits &= 0x40; /* Needs 0.01 ms */
 200 }
 201
 202 #ifdef MODULE
 203
 204 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 205 MODULE_DESCRIPTION("ACTiSYS IR-220L and IR-220L+ dongle driver");
 206
 207 /*
 208  * Function init_module (void)
 209  *
 210  *    Initialize Actisys module
 211  *
 212  */
 213 int init_module(void)
 214 {
 215         return actisys_init();
 216 }
 217
 218 /*
 219  * Function cleanup_module (void)
 220  *
 221  *    Cleanup Actisys module
 222  *
 223  */
 224 void cleanup_module(void)
 225 {
 226         actisys_cleanup();
 227 }
 228
 229 #endif