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                 WARNING("%s(), resetting dongle timed out!\n", __FUNCTION__);
 127                 ret = -1;
 128                 break;
 129         case IRDA_TASK_CHILD_DONE:
 130                 /* Set DTR and Clear RTS to enter command mode */
 131                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 132
 133                 switch (speed) {
 134                 case 9600:
 135                 default:
 136                         control[0] = GIRBIL_9600;
 137                         break;
 138                 case 19200:
 139                         control[0] = GIRBIL_19200;
 140                         break;
 141                 case 34800:
 142                         control[0] = GIRBIL_38400;
 143                         break;
 144                 case 57600:
 145                         control[0] = GIRBIL_57600;
 146                         break;
 147                 case 115200:
 148                         control[0] = GIRBIL_115200;
 149                         break;
 150                 }
 151                 control[1] = GIRBIL_LOAD;
 152
 153                 /* Write control bytes */
 154                 self->write(self->dev, control, 2);
 155                 irda_task_next_state(task, IRDA_TASK_WAIT);
 156                 ret = msecs_to_jiffies(100);
 157                 break;
 158         case IRDA_TASK_WAIT:
 159                 /* Go back to normal mode */
 160                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 161                 irda_task_next_state(task, IRDA_TASK_DONE);
 162                 self->speed_task = NULL;
 163                 break;
 164         default:
 165                 ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state);
 166                 irda_task_next_state(task, IRDA_TASK_DONE);
 167                 self->speed_task = NULL;
 168                 ret = -1;
 169                 break;
 170         }
 171         return ret;
 172 }
 173
 174 /*
 175  * Function girbil_reset (driver)
 176  *
 177  *      This function resets the girbil dongle.
 178  *
 179  *      Algorithm:
 180  *        0. set RTS, and wait at least 5 ms
 181  *        1. clear RTS
 182  */
 183 static int girbil_reset(struct irda_task *task)
 184 {
 185         dongle_t *self = (dongle_t *) task->instance;
 186         __u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
 187         int ret = 0;
 188
 189         self->reset_task = task;
 190
 191         switch (task->state) {
 192         case IRDA_TASK_INIT:
 193                 /* Reset dongle */
 194                 self->set_dtr_rts(self->dev, TRUE, FALSE);
 195                 irda_task_next_state(task, IRDA_TASK_WAIT1);
 196                 /* Sleep at least 5 ms */
 197                 ret = msecs_to_jiffies(20);
 198                 break;
 199         case IRDA_TASK_WAIT1:
 200                 /* Set DTR and clear RTS to enter command mode */
 201                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 202                 irda_task_next_state(task, IRDA_TASK_WAIT2);
 203                 ret = msecs_to_jiffies(20);
 204                 break;
 205         case IRDA_TASK_WAIT2:
 206                 /* Write control byte */
 207                 self->write(self->dev, &control, 1);
 208                 irda_task_next_state(task, IRDA_TASK_WAIT3);
 209                 ret = msecs_to_jiffies(20);
 210                 break;
 211         case IRDA_TASK_WAIT3:
 212                 /* Go back to normal mode */
 213                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 214                 irda_task_next_state(task, IRDA_TASK_DONE);
 215                 self->reset_task = NULL;
 216                 break;
 217         default:
 218                 ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state);
 219                 irda_task_next_state(task, IRDA_TASK_DONE);
 220                 self->reset_task = NULL;
 221                 ret = -1;
 222                 break;
 223         }
 224         return ret;
 225 }
 226
 227 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
 228 MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
 229 MODULE_LICENSE("GPL");
 230 MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
 231
 232 /*
 233  * Function init_module (void)
 234  *
 235  *    Initialize Girbil module
 236  *
 237  */
 238 module_init(girbil_init);
 239
 240 /*
 241  * Function cleanup_module (void)
 242  *
 243  *    Cleanup Girbil module
 244  *
 245  */
 246 module_exit(girbil_cleanup);
 247