drivers/net/irda/act200l.c

   1 /*********************************************************************
   2  *
   3  * Filename:      act200l.c
   4  * Version:       0.8
   5  * Description:   Implementation for the ACTiSYS ACT-IR200L dongle
   6  * Status:        Experimental.
   7  * Author:        SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
   8  * Created at:    Fri Aug  3 17:35:42 2001
   9  * Modified at:   Fri Aug 17 10:22:40 2001
  10  * Modified by:   SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
  11  *
  12  *     Copyright (c) 2001 SHIMIZU Takuya, 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  ********************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/delay.h>
  23 #include <linux/tty.h>
  24 #include <linux/init.h>
  25
  26 #include <net/irda/irda.h>
  27 #include <net/irda/irda_device.h>
  28
  29 static int  act200l_reset(struct irda_task *task);
  30 static void act200l_open(dongle_t *self, struct qos_info *qos);
  31 static void act200l_close(dongle_t *self);
  32 static int  act200l_change_speed(struct irda_task *task);
  33
  34 /* Regsiter 0: Control register #1 */
  35 #define ACT200L_REG0    0x00
  36 #define ACT200L_TXEN    0x01 /* Enable transmitter */
  37 #define ACT200L_RXEN    0x02 /* Enable receiver */
  38
  39 /* Register 1: Control register #2 */
  40 #define ACT200L_REG1    0x10
  41 #define ACT200L_LODB    0x01 /* Load new baud rate count value */
  42 #define ACT200L_WIDE    0x04 /* Expand the maximum allowable pulse */
  43
  44 /* Register 4: Output Power register */
  45 #define ACT200L_REG4    0x40
  46 #define ACT200L_OP0     0x01 /* Enable LED1C output */
  47 #define ACT200L_OP1     0x02 /* Enable LED2C output */
  48 #define ACT200L_BLKR    0x04
  49
  50 /* Register 5: Receive Mode register */
  51 #define ACT200L_REG5    0x50
  52 #define ACT200L_RWIDL   0x01 /* fixed 1.6us pulse mode */
  53
  54 /* Register 6: Receive Sensitivity register #1 */
  55 #define ACT200L_REG6    0x60
  56 #define ACT200L_RS0     0x01 /* receive threshold bit 0 */
  57 #define ACT200L_RS1     0x02 /* receive threshold bit 1 */
  58
  59 /* Register 7: Receive Sensitivity register #2 */
  60 #define ACT200L_REG7    0x70
  61 #define ACT200L_ENPOS   0x04 /* Ignore the falling edge */
  62
  63 /* Register 8,9: Baud Rate Dvider register #1,#2 */
  64 #define ACT200L_REG8    0x80
  65 #define ACT200L_REG9    0x90
  66
  67 #define ACT200L_2400    0x5f
  68 #define ACT200L_9600    0x17
  69 #define ACT200L_19200   0x0b
  70 #define ACT200L_38400   0x05
  71 #define ACT200L_57600   0x03
  72 #define ACT200L_115200  0x01
  73
  74 /* Register 13: Control register #3 */
  75 #define ACT200L_REG13   0xd0
  76 #define ACT200L_SHDW    0x01 /* Enable access to shadow registers */
  77
  78 /* Register 15: Status register */
  79 #define ACT200L_REG15   0xf0
  80
  81 /* Register 21: Control register #4 */
  82 #define ACT200L_REG21   0x50
  83 #define ACT200L_EXCK    0x02 /* Disable clock output driver */
  84 #define ACT200L_OSCL    0x04 /* oscillator in low power, medium accuracy mode */
  85
  86 static struct dongle_reg dongle = {
  87         .type = IRDA_ACT200L_DONGLE,
  88         .open = act200l_open,
  89         .close = act200l_close,
  90         .reset = act200l_reset,
  91         .change_speed = act200l_change_speed,
  92         .owner = THIS_MODULE,
  93 };
  94
  95 static int __init act200l_init(void)
  96 {
  97         return irda_device_register_dongle(&dongle);
  98 }
  99
 100 static void __exit act200l_cleanup(void)
 101 {
 102         irda_device_unregister_dongle(&dongle);
 103 }
 104
 105 static void act200l_open(dongle_t *self, struct qos_info *qos)
 106 {
 107         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 108
 109         /* Power on the dongle */
 110         self->set_dtr_rts(self->dev, TRUE, TRUE);
 111
 112         /* Set the speeds we can accept */
 113         qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 114         qos->min_turn_time.bits = 0x03;
 115 }
 116
 117 static void act200l_close(dongle_t *self)
 118 {
 119         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 120
 121         /* Power off the dongle */
 122         self->set_dtr_rts(self->dev, FALSE, FALSE);
 123 }
 124
 125 /*
 126  * Function act200l_change_speed (dev, speed)
 127  *
 128  *    Set the speed for the ACTiSYS ACT-IR200L type dongle.
 129  *
 130  */
 131 static int act200l_change_speed(struct irda_task *task)
 132 {
 133         dongle_t *self = (dongle_t *) task->instance;
 134         __u32 speed = (__u32) task->param;
 135         __u8 control[3];
 136         int ret = 0;
 137
 138         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 139
 140         self->speed_task = task;
 141
 142         switch (task->state) {
 143         case IRDA_TASK_INIT:
 144                 if (irda_task_execute(self, act200l_reset, NULL, task,
 145                                 (void *) speed))
 146                 {
 147                         /* Dongle need more time to reset */
 148                         irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
 149
 150                         /* Give reset 1 sec to finish */
 151                         ret = msecs_to_jiffies(1000);
 152                 }
 153                 break;
 154         case IRDA_TASK_CHILD_WAIT:
 155                 IRDA_WARNING("%s(), resetting dongle timed out!\n",
 156                              __FUNCTION__);
 157                 ret = -1;
 158                 break;
 159         case IRDA_TASK_CHILD_DONE:
 160                 /* Clear DTR and set RTS to enter command mode */
 161                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 162
 163                 switch (speed) {
 164                 case 9600:
 165                 default:
 166                         control[0] = ACT200L_REG8 |  (ACT200L_9600       & 0x0f);
 167                         control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);
 168                         break;
 169                 case 19200:
 170                         control[0] = ACT200L_REG8 |  (ACT200L_19200       & 0x0f);
 171                         control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);
 172                         break;
 173                 case 38400:
 174                         control[0] = ACT200L_REG8 |  (ACT200L_38400       & 0x0f);
 175                         control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);
 176                         break;
 177                 case 57600:
 178                         control[0] = ACT200L_REG8 |  (ACT200L_57600       & 0x0f);
 179                         control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);
 180                         break;
 181                 case 115200:
 182                         control[0] = ACT200L_REG8 |  (ACT200L_115200       & 0x0f);
 183                         control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);
 184                         break;
 185                 }
 186                 control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;
 187
 188                 /* Write control bytes */
 189                 self->write(self->dev, control, 3);
 190                 irda_task_next_state(task, IRDA_TASK_WAIT);
 191                 ret = msecs_to_jiffies(5);
 192                 break;
 193         case IRDA_TASK_WAIT:
 194                 /* Go back to normal mode */
 195                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 196
 197                 irda_task_next_state(task, IRDA_TASK_DONE);
 198                 self->speed_task = NULL;
 199                 break;
 200         default:
 201                 IRDA_ERROR("%s(), unknown state %d\n",
 202                            __FUNCTION__, task->state);
 203                 irda_task_next_state(task, IRDA_TASK_DONE);
 204                 self->speed_task = NULL;
 205                 ret = -1;
 206                 break;
 207         }
 208         return ret;
 209 }
 210
 211 /*
 212  * Function act200l_reset (driver)
 213  *
 214  *    Reset the ACTiSYS ACT-IR200L type dongle.
 215  */
 216 static int act200l_reset(struct irda_task *task)
 217 {
 218         dongle_t *self = (dongle_t *) task->instance;
 219         __u8 control[9] = {
 220                 ACT200L_REG15,
 221                 ACT200L_REG13 | ACT200L_SHDW,
 222                 ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
 223                 ACT200L_REG13,
 224                 ACT200L_REG7  | ACT200L_ENPOS,
 225                 ACT200L_REG6  | ACT200L_RS0  | ACT200L_RS1,
 226                 ACT200L_REG5  | ACT200L_RWIDL,
 227                 ACT200L_REG4  | ACT200L_OP0  | ACT200L_OP1 | ACT200L_BLKR,
 228                 ACT200L_REG0  | ACT200L_TXEN | ACT200L_RXEN
 229         };
 230         int ret = 0;
 231
 232         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 233
 234         self->reset_task = task;
 235
 236         switch (task->state) {
 237         case IRDA_TASK_INIT:
 238                 /* Power on the dongle */
 239                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 240
 241                 irda_task_next_state(task, IRDA_TASK_WAIT1);
 242                 ret = msecs_to_jiffies(50);
 243                 break;
 244         case IRDA_TASK_WAIT1:
 245                 /* Reset the dongle : set RTS low for 25 ms */
 246                 self->set_dtr_rts(self->dev, TRUE, FALSE);
 247
 248                 irda_task_next_state(task, IRDA_TASK_WAIT2);
 249                 ret = msecs_to_jiffies(50);
 250                 break;
 251         case IRDA_TASK_WAIT2:
 252                 /* Clear DTR and set RTS to enter command mode */
 253                 self->set_dtr_rts(self->dev, FALSE, TRUE);
 254
 255                 /* Write control bytes */
 256                 self->write(self->dev, control, 9);
 257                 irda_task_next_state(task, IRDA_TASK_WAIT3);
 258                 ret = msecs_to_jiffies(15);
 259                 break;
 260         case IRDA_TASK_WAIT3:
 261                 /* Go back to normal mode */
 262                 self->set_dtr_rts(self->dev, TRUE, TRUE);
 263
 264                 irda_task_next_state(task, IRDA_TASK_DONE);
 265                 self->reset_task = NULL;
 266                 break;
 267         default:
 268                 IRDA_ERROR("%s(), unknown state %d\n",
 269                            __FUNCTION__, task->state);
 270                 irda_task_next_state(task, IRDA_TASK_DONE);
 271                 self->reset_task = NULL;
 272                 ret = -1;
 273                 break;
 274         }
 275         return ret;
 276 }
 277
 278 MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
 279 MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
 280 MODULE_LICENSE("GPL");
 281 MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
 282
 283 /*
 284  * Function init_module (void)
 285  *
 286  *    Initialize ACTiSYS ACT-IR200L module
 287  *
 288  */
 289 module_init(act200l_init);
 290
 291 /*
 292  * Function cleanup_module (void)
 293  *
 294  *    Cleanup ACTiSYS ACT-IR200L module
 295  *
 296  */
 297 module_exit(act200l_cleanup);