Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: tekram.c |
| 4 | * Version: 1.3 |
| 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: Sun Oct 27 22:02:38 2002 |
| 10 | * Modified by: Martin Diehl <mad@mdiehl.de> |
| 11 | * |
| 12 | * Copyright (c) 1998-1999 Dag Brattli, |
| 13 | * Copyright (c) 2002 Martin Diehl, |
| 14 | * All Rights Reserved. |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or |
| 17 | * modify it under the terms of the GNU General Public License as |
| 18 | * published by the Free Software Foundation; either version 2 of |
| 19 | * the License, or (at your option) any later version. |
| 20 | * |
| 21 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
| 22 | * provide warranty for any of this software. This material is |
| 23 | * provided "AS-IS" and at no charge. |
| 24 | * |
| 25 | ********************************************************************/ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/init.h> |
| 30 | |
| 31 | #include <net/irda/irda.h> |
| 32 | |
| 33 | #include "sir-dev.h" |
| 34 | |
| 35 | static int tekram_delay = 150; /* default is 150 ms */ |
| 36 | module_param(tekram_delay, int, 0); |
| 37 | MODULE_PARM_DESC(tekram_delay, "tekram dongle write complete delay"); |
| 38 | |
| 39 | static int tekram_open(struct sir_dev *); |
| 40 | static int tekram_close(struct sir_dev *); |
| 41 | static int tekram_change_speed(struct sir_dev *, unsigned); |
| 42 | static int tekram_reset(struct sir_dev *); |
| 43 | |
| 44 | #define TEKRAM_115200 0x00 |
| 45 | #define TEKRAM_57600 0x01 |
| 46 | #define TEKRAM_38400 0x02 |
| 47 | #define TEKRAM_19200 0x03 |
| 48 | #define TEKRAM_9600 0x04 |
| 49 | |
| 50 | #define TEKRAM_PW 0x10 /* Pulse select bit */ |
| 51 | |
| 52 | static struct dongle_driver tekram = { |
| 53 | .owner = THIS_MODULE, |
| 54 | .driver_name = "Tekram IR-210B", |
| 55 | .type = IRDA_TEKRAM_DONGLE, |
| 56 | .open = tekram_open, |
| 57 | .close = tekram_close, |
| 58 | .reset = tekram_reset, |
| 59 | .set_speed = tekram_change_speed, |
| 60 | }; |
| 61 | |
| 62 | static int __init tekram_sir_init(void) |
| 63 | { |
| 64 | if (tekram_delay < 1 || tekram_delay > 500) |
| 65 | tekram_delay = 200; |
| 66 | IRDA_DEBUG(1, "%s - using %d ms delay\n", |
| 67 | tekram.driver_name, tekram_delay); |
| 68 | return irda_register_dongle(&tekram); |
| 69 | } |
| 70 | |
| 71 | static void __exit tekram_sir_cleanup(void) |
| 72 | { |
| 73 | irda_unregister_dongle(&tekram); |
| 74 | } |
| 75 | |
| 76 | static int tekram_open(struct sir_dev *dev) |
| 77 | { |
| 78 | struct qos_info *qos = &dev->qos; |
| 79 | |
| 80 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| 81 | |
| 82 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 83 | |
| 84 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; |
| 85 | qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */ |
| 86 | irda_qos_bits_to_value(qos); |
| 87 | |
| 88 | /* irda thread waits 50 msec for power settling */ |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int tekram_close(struct sir_dev *dev) |
| 94 | { |
| 95 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| 96 | |
| 97 | /* Power off dongle */ |
| 98 | sirdev_set_dtr_rts(dev, FALSE, FALSE); |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Function tekram_change_speed (dev, state, speed) |
| 105 | * |
| 106 | * Set the speed for the Tekram IRMate 210 type dongle. Warning, this |
| 107 | * function must be called with a process context! |
| 108 | * |
| 109 | * Algorithm |
| 110 | * 1. clear DTR |
| 111 | * 2. set RTS, and wait at least 7 us |
| 112 | * 3. send Control Byte to the IR-210 through TXD to set new baud rate |
| 113 | * wait until the stop bit of Control Byte is sent (for 9600 baud rate, |
| 114 | * it takes about 100 msec) |
| 115 | * |
| 116 | * [oops, why 100 msec? sending 1 byte (10 bits) takes 1.05 msec |
| 117 | * - is this probably to compensate for delays in tty layer?] |
| 118 | * |
| 119 | * 5. clear RTS (return to NORMAL Operation) |
| 120 | * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here |
| 121 | * after |
| 122 | */ |
| 123 | |
| 124 | #define TEKRAM_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1) |
| 125 | |
| 126 | static int tekram_change_speed(struct sir_dev *dev, unsigned speed) |
| 127 | { |
| 128 | unsigned state = dev->fsm.substate; |
| 129 | unsigned delay = 0; |
| 130 | u8 byte; |
| 131 | static int ret = 0; |
| 132 | |
| 133 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| 134 | |
| 135 | switch(state) { |
| 136 | case SIRDEV_STATE_DONGLE_SPEED: |
| 137 | |
| 138 | switch (speed) { |
| 139 | default: |
| 140 | speed = 9600; |
| 141 | ret = -EINVAL; |
| 142 | /* fall thru */ |
| 143 | case 9600: |
| 144 | byte = TEKRAM_PW|TEKRAM_9600; |
| 145 | break; |
| 146 | case 19200: |
| 147 | byte = TEKRAM_PW|TEKRAM_19200; |
| 148 | break; |
| 149 | case 38400: |
| 150 | byte = TEKRAM_PW|TEKRAM_38400; |
| 151 | break; |
| 152 | case 57600: |
| 153 | byte = TEKRAM_PW|TEKRAM_57600; |
| 154 | break; |
| 155 | case 115200: |
| 156 | byte = TEKRAM_115200; |
| 157 | break; |
| 158 | } |
| 159 | |
| 160 | /* Set DTR, Clear RTS */ |
| 161 | sirdev_set_dtr_rts(dev, TRUE, FALSE); |
| 162 | |
| 163 | /* Wait at least 7us */ |
| 164 | udelay(14); |
| 165 | |
| 166 | /* Write control byte */ |
| 167 | sirdev_raw_write(dev, &byte, 1); |
| 168 | |
| 169 | dev->speed = speed; |
| 170 | |
| 171 | state = TEKRAM_STATE_WAIT_SPEED; |
| 172 | delay = tekram_delay; |
| 173 | break; |
| 174 | |
| 175 | case TEKRAM_STATE_WAIT_SPEED: |
| 176 | /* Set DTR, Set RTS */ |
| 177 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 178 | udelay(50); |
| 179 | break; |
| 180 | |
| 181 | default: |
| 182 | IRDA_ERROR("%s - undefined state %d\n", __FUNCTION__, state); |
| 183 | ret = -EINVAL; |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | dev->fsm.substate = state; |
| 188 | return (delay > 0) ? delay : ret; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Function tekram_reset (driver) |
| 193 | * |
| 194 | * This function resets the tekram dongle. Warning, this function |
| 195 | * must be called with a process context!! |
| 196 | * |
| 197 | * Algorithm: |
| 198 | * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) |
| 199 | * 1. clear RTS |
| 200 | * 2. set DTR, and wait at least 1 ms |
| 201 | * 3. clear DTR to SPACE state, wait at least 50 us for further |
| 202 | * operation |
| 203 | */ |
| 204 | |
| 205 | static int tekram_reset(struct sir_dev *dev) |
| 206 | { |
| 207 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| 208 | |
| 209 | /* Clear DTR, Set RTS */ |
| 210 | sirdev_set_dtr_rts(dev, FALSE, TRUE); |
| 211 | |
| 212 | /* Should sleep 1 ms */ |
| 213 | msleep(1); |
| 214 | |
| 215 | /* Set DTR, Set RTS */ |
| 216 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 217 | |
| 218 | /* Wait at least 50 us */ |
| 219 | udelay(75); |
| 220 | |
| 221 | dev->speed = 9600; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); |
| 227 | MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); |
| 228 | MODULE_LICENSE("GPL"); |
| 229 | MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ |
| 230 | |
| 231 | module_init(tekram_sir_init); |
| 232 | module_exit(tekram_sir_cleanup); |