Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | IRDA_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 | IRDA_WARNING("%s(), resetting dongle timed out!\n", |
| 159 | __FUNCTION__); |
| 160 | ret = -1; |
| 161 | break; |
| 162 | case IRDA_TASK_CHILD_DONE: |
| 163 | /* Set DTR, Clear RTS */ |
| 164 | self->set_dtr_rts(self->dev, TRUE, FALSE); |
| 165 | |
| 166 | /* Wait at least 7us */ |
| 167 | udelay(14); |
| 168 | |
| 169 | /* Write control byte */ |
| 170 | self->write(self->dev, &byte, 1); |
| 171 | |
| 172 | irda_task_next_state(task, IRDA_TASK_WAIT); |
| 173 | |
| 174 | /* Wait at least 100 ms */ |
| 175 | ret = msecs_to_jiffies(150); |
| 176 | break; |
| 177 | case IRDA_TASK_WAIT: |
| 178 | /* Set DTR, Set RTS */ |
| 179 | self->set_dtr_rts(self->dev, TRUE, TRUE); |
| 180 | |
| 181 | irda_task_next_state(task, IRDA_TASK_DONE); |
| 182 | self->speed_task = NULL; |
| 183 | break; |
| 184 | default: |
| 185 | IRDA_ERROR("%s(), unknown state %d\n", |
| 186 | __FUNCTION__, task->state); |
| 187 | irda_task_next_state(task, IRDA_TASK_DONE); |
| 188 | self->speed_task = NULL; |
| 189 | ret = -1; |
| 190 | break; |
| 191 | } |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Function tekram_reset (driver) |
| 197 | * |
| 198 | * This function resets the tekram dongle. Warning, this function |
| 199 | * must be called with a process context!! |
| 200 | * |
| 201 | * Algorithm: |
| 202 | * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) |
| 203 | * 1. clear RTS |
| 204 | * 2. set DTR, and wait at least 1 ms |
| 205 | * 3. clear DTR to SPACE state, wait at least 50 us for further |
| 206 | * operation |
| 207 | */ |
| 208 | int tekram_reset(struct irda_task *task) |
| 209 | { |
| 210 | dongle_t *self = (dongle_t *) task->instance; |
| 211 | int ret = 0; |
| 212 | |
| 213 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 214 | |
| 215 | IRDA_ASSERT(task != NULL, return -1;); |
| 216 | |
| 217 | if (self->reset_task && self->reset_task != task) { |
| 218 | IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ ); |
| 219 | return msecs_to_jiffies(10); |
| 220 | } else |
| 221 | self->reset_task = task; |
| 222 | |
| 223 | /* Power off dongle */ |
| 224 | //self->set_dtr_rts(self->dev, FALSE, FALSE); |
| 225 | self->set_dtr_rts(self->dev, TRUE, TRUE); |
| 226 | |
| 227 | switch (task->state) { |
| 228 | case IRDA_TASK_INIT: |
| 229 | irda_task_next_state(task, IRDA_TASK_WAIT1); |
| 230 | |
| 231 | /* Sleep 50 ms */ |
| 232 | ret = msecs_to_jiffies(50); |
| 233 | break; |
| 234 | case IRDA_TASK_WAIT1: |
| 235 | /* Clear DTR, Set RTS */ |
| 236 | self->set_dtr_rts(self->dev, FALSE, TRUE); |
| 237 | |
| 238 | irda_task_next_state(task, IRDA_TASK_WAIT2); |
| 239 | |
| 240 | /* Should sleep 1 ms */ |
| 241 | ret = msecs_to_jiffies(1); |
| 242 | break; |
| 243 | case IRDA_TASK_WAIT2: |
| 244 | /* Set DTR, Set RTS */ |
| 245 | self->set_dtr_rts(self->dev, TRUE, TRUE); |
| 246 | |
| 247 | /* Wait at least 50 us */ |
| 248 | udelay(75); |
| 249 | |
| 250 | irda_task_next_state(task, IRDA_TASK_DONE); |
| 251 | self->reset_task = NULL; |
| 252 | break; |
| 253 | default: |
| 254 | IRDA_ERROR("%s(), unknown state %d\n", |
| 255 | __FUNCTION__, task->state); |
| 256 | irda_task_next_state(task, IRDA_TASK_DONE); |
| 257 | self->reset_task = NULL; |
| 258 | ret = -1; |
| 259 | } |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); |
| 264 | MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); |
| 265 | MODULE_LICENSE("GPL"); |
| 266 | MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ |
| 267 | |
| 268 | /* |
| 269 | * Function init_module (void) |
| 270 | * |
| 271 | * Initialize Tekram module |
| 272 | * |
| 273 | */ |
| 274 | module_init(tekram_init); |
| 275 | |
| 276 | /* |
| 277 | * Function cleanup_module (void) |
| 278 | * |
| 279 | * Cleanup Tekram module |
| 280 | * |
| 281 | */ |
| 282 | module_exit(tekram_cleanup); |