drivers/net/irda/tekram.c

   1 /*********************************************************************
   2  *
   3  * Filename:      tekram.c
   4  * Version:       1.2
   5  * Description:   Implementation of the Tekram IrMate IR-210B dongle
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Wed Oct 21 20:02:35 1998
   9  * Modified at:   Fri Dec 17 09:13:09 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  20  *     provide warranty for any of this software. This material is
  21  *     provided "AS-IS" and at no charge.
  22  *
  23  ********************************************************************/
  24
  25 #include <linux/module.h>
  26 #include <linux/delay.h>
  27 #include <linux/tty.h>
  28 #include <linux/init.h>
  29
  30 #include <net/irda/irda.h>
  31 #include <net/irda/irda_device.h>
  32
  33 static void tekram_open(dongle_t *self, struct qos_info *qos);
  34 static void tekram_close(dongle_t *self);
  35 static int  tekram_change_speed(struct irda_task *task);
  36 static int  tekram_reset(struct irda_task *task);
  37
  38 #define TEKRAM_115200 0x00
  39 #define TEKRAM_57600  0x01
  40 #define TEKRAM_38400  0x02
  41 #define TEKRAM_19200  0x03
  42 #define TEKRAM_9600   0x04
  43
  44 #define TEKRAM_PW     0x10 /* Pulse select bit */
  45
  46 static struct dongle_reg dongle = {
  47         .type = IRDA_TEKRAM_DONGLE,
  48         .open  = tekram_open,
  49         .close = tekram_close,
  50         .reset = tekram_reset,
  51         .change_speed = tekram_change_speed,
  52         .owner = THIS_MODULE,
  53 };
  54
  55 static int __init tekram_init(void)
  56 {
  57         return irda_device_register_dongle(&dongle);
  58 }
  59
  60 static void __exit tekram_cleanup(void)
  61 {
  62         irda_device_unregister_dongle(&dongle);
  63 }
  64
  65 static void tekram_open(dongle_t *self, struct qos_info *qos)
  66 {
  67         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  68
  69         qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
  70         qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
  71         irda_qos_bits_to_value(qos);
  72 }
  73
  74 static void tekram_close(dongle_t *self)
  75 {
  76         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  77
  78         /* Power off dongle */
  79         self->set_dtr_rts(self->dev, FALSE, FALSE);
  80
  81         if (self->reset_task)
  82                 irda_task_delete(self->reset_task);
  83         if (self->speed_task)
  84                 irda_task_delete(self->speed_task);
  85 }
  86
  87 /*
  88  * Function tekram_change_speed (dev, state, speed)
  89  *
  90  *    Set the speed for the Tekram IRMate 210 type dongle. Warning, this
  91  *    function must be called with a process context!
  92  *
  93  *    Algorithm
  94  *    1. clear DTR
  95  *    2. set RTS, and wait at least 7 us
  96  *    3. send Control Byte to the IR-210 through TXD to set new baud rate
  97  *       wait until the stop bit of Control Byte is sent (for 9600 baud rate,
  98  *       it takes about 100 msec)
  99  *    5. clear RTS (return to NORMAL Operation)
 100  *    6. wait at least 50 us, new setting (baud rate, etc) takes effect here
 101  *       after
 102  */
 103 static int tekram_change_speed(struct irda_task *task)
 104 {
 105         dongle_t *self = (dongle_t *) task->instance;
 106         __u32 speed = (__u32) task->param;
 107         __u8 byte;
 108         int ret = 0;
 109
 110         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 111
 112         ASSERT(task != NULL, return -1;);
 113
 114         if (self->speed_task && self->speed_task != task) {
 115                 IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
 116                 return msecs_to_jiffies(10);
 117         } else
 118                 self->speed_task = task;
 119
 120         switch (speed) {
 121         default:
 122         case 9600:
 123                 byte = TEKRAM_PW|TEKRAM_9600;
 124                 break;
 125         case 19200:
 126                 byte = TEKRAM_PW|TEKRAM_19200;
 127                 break;
 128         case 38400:
 129                 byte = TEKRAM_PW|TEKRAM_38400;
 130                 break;
 131         case 57600:
 132                 byte = TEKRAM_PW|TEKRAM_57600;
 133                 break;
 134         case 115200:
 135                 byte = TEKRAM_115200;
 136                 break;
 137         }
 138
 139         switch (task->state) {
 140         case IRDA_TASK_INIT:
 141         case IRDA_TASK_CHILD_INIT:
 142                 /*
 143                  * Need to reset the dongle and go to 9600 bps before
 144                  * programming
 145                  */
 146                 if (irda_task_execute(self, tekram_reset, NULL, task,
 147                                       (void *) speed))
 148                 {
 149                         /* Dongle need more time to reset */
 150                         irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
 151
 152                         /* Give reset 1 sec to finish */
 153                         ret = msecs_to_jiffies(1000);
 154                 } else
 155                         irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
 156                 break;
 157         case IRDA_TASK_CHILD_WAIT:
 158                 WARNING("%s(), resetting dongle timed out!\n", __FUNCTION__);
 159                 ret = -1;
 160                 break;
 161         case IRDA_TASK_CHILD_DONE:
 162                 /* Set DTR, Clear RTS */
 163                 self->set_dtr_rts(self->dev, TRUE, FALSE);
 164
 165                 /* Wait at least 7us */
 166                 udelay(14);
 167
 168                 /* Write control byte */
 169                 self->write(self->dev, &byte, 1);
 170
 171                 irda_task_next_state(task, IRDA_TASK_WAIT);
 172
 173                 /* Wait at least 100 ms */
 174                 ret = msecs_to_jiffies(150);
 175                 break;
 176         case IRDA_TASK_WAIT:
 177                 /* Set DTR, Set RTS */
 178                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 179
 180                 irda_task_next_state(task, IRDA_TASK_DONE);
 181                 self->speed_task = NULL;
 182                 break;
 183         default:
 184                 ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state);
 185                 irda_task_next_state(task, IRDA_TASK_DONE);
 186                 self->speed_task = NULL;
 187                 ret = -1;
 188                 break;
 189         }
 190         return ret;
 191 }
 192
 193 /*
 194  * Function tekram_reset (driver)
 195  *
 196  *      This function resets the tekram dongle. Warning, this function
 197  *      must be called with a process context!!
 198  *
 199  *      Algorithm:
 200  *        0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 )
 201  *        1. clear RTS
 202  *        2. set DTR, and wait at least 1 ms
 203  *        3. clear DTR to SPACE state, wait at least 50 us for further
 204  *         operation
 205  */
 206 int tekram_reset(struct irda_task *task)
 207 {
 208         dongle_t *self = (dongle_t *) task->instance;
 209         int ret = 0;
 210
 211         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 212
 213         ASSERT(task != NULL, return -1;);
 214
 215         if (self->reset_task && self->reset_task != task) {
 216                 IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
 217                 return msecs_to_jiffies(10);
 218         } else
 219                 self->reset_task = task;
 220
 221         /* Power off dongle */
 222         //self->set_dtr_rts(self->dev, FALSE, FALSE);
 223         self->set_dtr_rts(self->dev, TRUE, TRUE);
 224
 225         switch (task->state) {
 226         case IRDA_TASK_INIT:
 227                 irda_task_next_state(task, IRDA_TASK_WAIT1);
 228
 229                 /* Sleep 50 ms */
 230                 ret = msecs_to_jiffies(50);
 231                 break;
 232         case IRDA_TASK_WAIT1:
 233                 /* Clear DTR, Set RTS */
 234                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 235
 236                 irda_task_next_state(task, IRDA_TASK_WAIT2);
 237
 238                 /* Should sleep 1 ms */
 239                 ret = msecs_to_jiffies(1);
 240                 break;
 241         case IRDA_TASK_WAIT2:
 242                 /* Set DTR, Set RTS */
 243                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 244
 245                 /* Wait at least 50 us */
 246                 udelay(75);
 247
 248                 irda_task_next_state(task, IRDA_TASK_DONE);
 249                 self->reset_task = NULL;
 250                 break;
 251         default:
 252                 ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state);
 253                 irda_task_next_state(task, IRDA_TASK_DONE);
 254                 self->reset_task = NULL;
 255                 ret = -1;
 256         }
 257         return ret;
 258 }
 259
 260 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 261 MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");
 262 MODULE_LICENSE("GPL");
 263 MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */
 264
 265 /*
 266  * Function init_module (void)
 267  *
 268  *    Initialize Tekram module
 269  *
 270  */
 271 module_init(tekram_init);
 272
 273 /*
 274  * Function cleanup_module (void)
 275  *
 276  *    Cleanup Tekram module
 277  *
 278  */
 279 module_exit(tekram_cleanup);