drivers/net/irda/girbil.c

   1 /*********************************************************************
   2  *
   3  * Filename:      girbil.c
   4  * Version:       1.2
   5  * Description:   Implementation for the Greenwich GIrBIL dongle
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sat Feb  6 21:02:33 1999
   9  * Modified at:   Fri Dec 17 09:13:20 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 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 int  girbil_reset(struct irda_task *task);
  34 static void girbil_open(dongle_t *self, struct qos_info *qos);
  35 static void girbil_close(dongle_t *self);
  36 static int  girbil_change_speed(struct irda_task *task);
  37
  38 /* Control register 1 */
  39 #define GIRBIL_TXEN    0x01 /* Enable transmitter */
  40 #define GIRBIL_RXEN    0x02 /* Enable receiver */
  41 #define GIRBIL_ECAN    0x04 /* Cancel self emmited data */
  42 #define GIRBIL_ECHO    0x08 /* Echo control characters */
  43
  44 /* LED Current Register (0x2) */
  45 #define GIRBIL_HIGH    0x20
  46 #define GIRBIL_MEDIUM  0x21
  47 #define GIRBIL_LOW     0x22
  48
  49 /* Baud register (0x3) */
  50 #define GIRBIL_2400    0x30
  51 #define GIRBIL_4800    0x31
  52 #define GIRBIL_9600    0x32
  53 #define GIRBIL_19200   0x33
  54 #define GIRBIL_38400   0x34
  55 #define GIRBIL_57600   0x35
  56 #define GIRBIL_115200  0x36
  57
  58 /* Mode register (0x4) */
  59 #define GIRBIL_IRDA    0x40
  60 #define GIRBIL_ASK     0x41
  61
  62 /* Control register 2 (0x5) */
  63 #define GIRBIL_LOAD    0x51 /* Load the new baud rate value */
  64
  65 static struct dongle_reg dongle = {
  66         .type = IRDA_GIRBIL_DONGLE,
  67         .open = girbil_open,
  68         .close = girbil_close,
  69         .reset = girbil_reset,
  70         .change_speed = girbil_change_speed,
  71         .owner = THIS_MODULE,
  72 };
  73
  74 static int __init girbil_init(void)
  75 {
  76         return irda_device_register_dongle(&dongle);
  77 }
  78
  79 static void __exit girbil_cleanup(void)
  80 {
  81         irda_device_unregister_dongle(&dongle);
  82 }
  83
  84 static void girbil_open(dongle_t *self, struct qos_info *qos)
  85 {
  86         qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
  87         qos->min_turn_time.bits = 0x03;
  88 }
  89
  90 static void girbil_close(dongle_t *self)
  91 {
  92         /* Power off dongle */
  93         self->set_dtr_rts(self->dev, FALSE, FALSE);
  94 }
  95
  96 /*
  97  * Function girbil_change_speed (dev, speed)
  98  *
  99  *    Set the speed for the Girbil type dongle.
 100  *
 101  */
 102 static int girbil_change_speed(struct irda_task *task)
 103 {
 104         dongle_t *self = (dongle_t *) task->instance;
 105         __u32 speed = (__u32) task->param;
 106         __u8 control[2];
 107         int ret = 0;
 108
 109         self->speed_task = task;
 110
 111         switch (task->state) {
 112         case IRDA_TASK_INIT:
 113                 /* Need to reset the dongle and go to 9600 bps before
 114                    programming */
 115                 if (irda_task_execute(self, girbil_reset, NULL, task,
 116                                       (void *) speed))
 117                 {
 118                         /* Dongle need more time to reset */
 119                         irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
 120
 121                         /* Give reset 1 sec to finish */
 122                         ret = msecs_to_jiffies(1000);
 123                 }
 124                 break;
 125         case IRDA_TASK_CHILD_WAIT:
 126                 IRDA_WARNING("%s(), resetting dongle timed out!\n",
 127                              __FUNCTION__);
 128                 ret = -1;
 129                 break;
 130         case IRDA_TASK_CHILD_DONE:
 131                 /* Set DTR and Clear RTS to enter command mode */
 132                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 133
 134                 switch (speed) {
 135                 case 9600:
 136                 default:
 137                         control[0] = GIRBIL_9600;
 138                         break;
 139                 case 19200:
 140                         control[0] = GIRBIL_19200;
 141                         break;
 142                 case 34800:
 143                         control[0] = GIRBIL_38400;
 144                         break;
 145                 case 57600:
 146                         control[0] = GIRBIL_57600;
 147                         break;
 148                 case 115200:
 149                         control[0] = GIRBIL_115200;
 150                         break;
 151                 }
 152                 control[1] = GIRBIL_LOAD;
 153
 154                 /* Write control bytes */
 155                 self->write(self->dev, control, 2);
 156                 irda_task_next_state(task, IRDA_TASK_WAIT);
 157                 ret = msecs_to_jiffies(100);
 158                 break;
 159         case IRDA_TASK_WAIT:
 160                 /* Go back to normal mode */
 161                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 162                 irda_task_next_state(task, IRDA_TASK_DONE);
 163                 self->speed_task = NULL;
 164                 break;
 165         default:
 166                 IRDA_ERROR("%s(), unknown state %d\n",
 167                            __FUNCTION__, task->state);
 168                 irda_task_next_state(task, IRDA_TASK_DONE);
 169                 self->speed_task = NULL;
 170                 ret = -1;
 171                 break;
 172         }
 173         return ret;
 174 }
 175
 176 /*
 177  * Function girbil_reset (driver)
 178  *
 179  *      This function resets the girbil dongle.
 180  *
 181  *      Algorithm:
 182  *        0. set RTS, and wait at least 5 ms
 183  *        1. clear RTS
 184  */
 185 static int girbil_reset(struct irda_task *task)
 186 {
 187         dongle_t *self = (dongle_t *) task->instance;
 188         __u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
 189         int ret = 0;
 190
 191         self->reset_task = task;
 192
 193         switch (task->state) {
 194         case IRDA_TASK_INIT:
 195                 /* Reset dongle */
 196                 self->set_dtr_rts(self->dev, TRUE, FALSE);
 197                 irda_task_next_state(task, IRDA_TASK_WAIT1);
 198                 /* Sleep at least 5 ms */
 199                 ret = msecs_to_jiffies(20);
 200                 break;
 201         case IRDA_TASK_WAIT1:
 202                 /* Set DTR and clear RTS to enter command mode */
 203                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 204                 irda_task_next_state(task, IRDA_TASK_WAIT2);
 205                 ret = msecs_to_jiffies(20);
 206                 break;
 207         case IRDA_TASK_WAIT2:
 208                 /* Write control byte */
 209                 self->write(self->dev, &control, 1);
 210                 irda_task_next_state(task, IRDA_TASK_WAIT3);
 211                 ret = msecs_to_jiffies(20);
 212                 break;
 213         case IRDA_TASK_WAIT3:
 214                 /* Go back to normal mode */
 215                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 216                 irda_task_next_state(task, IRDA_TASK_DONE);
 217                 self->reset_task = NULL;
 218                 break;
 219         default:
 220                 IRDA_ERROR("%s(), unknown state %d\n",
 221                            __FUNCTION__, task->state);
 222                 irda_task_next_state(task, IRDA_TASK_DONE);
 223                 self->reset_task = NULL;
 224                 ret = -1;
 225                 break;
 226         }
 227         return ret;
 228 }
 229
 230 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 231 MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
 232 MODULE_LICENSE("GPL");
 233 MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
 234
 235 /*
 236  * Function init_module (void)
 237  *
 238  *    Initialize Girbil module
 239  *
 240  */
 241 module_init(girbil_init);
 242
 243 /*
 244  * Function cleanup_module (void)
 245  *
 246  *    Cleanup Girbil module
 247  *
 248  */
 249 module_exit(girbil_cleanup);
 250