Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: ma600.c |
| 4 | * Version: 0.1 |
| 5 | * Description: Implementation of the MA600 dongle |
| 6 | * Status: Experimental. |
| 7 | * Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95 |
| 8 | * Created at: Sat Jun 10 20:02:35 2000 |
| 9 | * Modified at: Sat Aug 16 09:34:13 2003 |
| 10 | * Modified by: Martin Diehl <mad@mdiehl.de> (modified for new sir_dev) |
| 11 | * |
| 12 | * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing |
| 13 | * information on the MA600 dongle |
| 14 | * |
| 15 | * Copyright (c) 2000 Leung, All Rights Reserved. |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License as |
| 19 | * published by the Free Software Foundation; either version 2 of |
| 20 | * the License, or (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | e8478de | 2013-12-06 06:28:44 -0800 | [diff] [blame] | 28 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * |
| 30 | ********************************************************************/ |
| 31 | |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <net/irda/irda.h> |
| 37 | |
| 38 | #include "sir-dev.h" |
| 39 | |
| 40 | static int ma600_open(struct sir_dev *); |
| 41 | static int ma600_close(struct sir_dev *); |
| 42 | static int ma600_change_speed(struct sir_dev *, unsigned); |
| 43 | static int ma600_reset(struct sir_dev *); |
| 44 | |
| 45 | /* control byte for MA600 */ |
| 46 | #define MA600_9600 0x00 |
| 47 | #define MA600_19200 0x01 |
| 48 | #define MA600_38400 0x02 |
| 49 | #define MA600_57600 0x03 |
| 50 | #define MA600_115200 0x04 |
| 51 | #define MA600_DEV_ID1 0x05 |
| 52 | #define MA600_DEV_ID2 0x06 |
| 53 | #define MA600_2400 0x08 |
| 54 | |
| 55 | static struct dongle_driver ma600 = { |
| 56 | .owner = THIS_MODULE, |
| 57 | .driver_name = "MA600", |
| 58 | .type = IRDA_MA600_DONGLE, |
| 59 | .open = ma600_open, |
| 60 | .close = ma600_close, |
| 61 | .reset = ma600_reset, |
| 62 | .set_speed = ma600_change_speed, |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | static int __init ma600_sir_init(void) |
| 67 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | return irda_register_dongle(&ma600); |
| 69 | } |
| 70 | |
| 71 | static void __exit ma600_sir_cleanup(void) |
| 72 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | irda_unregister_dongle(&ma600); |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | Power on: |
| 78 | (0) Clear RTS and DTR for 1 second |
| 79 | (1) Set RTS and DTR for 1 second |
| 80 | (2) 9600 bps now |
| 81 | Note: assume RTS, DTR are clear before |
| 82 | */ |
| 83 | static int ma600_open(struct sir_dev *dev) |
| 84 | { |
| 85 | struct qos_info *qos = &dev->qos; |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 88 | |
| 89 | /* Explicitly set the speeds we can accept */ |
| 90 | qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400 |
| 91 | |IR_57600|IR_115200; |
| 92 | /* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */ |
| 93 | qos->min_turn_time.bits = 0x01; /* Needs at least 1 ms */ |
| 94 | irda_qos_bits_to_value(qos); |
| 95 | |
| 96 | /* irda thread waits 50 msec for power settling */ |
| 97 | |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | static int ma600_close(struct sir_dev *dev) |
| 102 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | /* Power off dongle */ |
| 104 | sirdev_set_dtr_rts(dev, FALSE, FALSE); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static __u8 get_control_byte(__u32 speed) |
| 110 | { |
| 111 | __u8 byte; |
| 112 | |
| 113 | switch (speed) { |
| 114 | default: |
| 115 | case 115200: |
| 116 | byte = MA600_115200; |
| 117 | break; |
| 118 | case 57600: |
| 119 | byte = MA600_57600; |
| 120 | break; |
| 121 | case 38400: |
| 122 | byte = MA600_38400; |
| 123 | break; |
| 124 | case 19200: |
| 125 | byte = MA600_19200; |
| 126 | break; |
| 127 | case 9600: |
| 128 | byte = MA600_9600; |
| 129 | break; |
| 130 | case 2400: |
| 131 | byte = MA600_2400; |
| 132 | break; |
| 133 | } |
| 134 | |
| 135 | return byte; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Function ma600_change_speed (dev, speed) |
| 140 | * |
| 141 | * Set the speed for the MA600 type dongle. |
| 142 | * |
| 143 | * The dongle has already been reset to a known state (dongle default) |
| 144 | * We cycle through speeds by pulsing RTS low and then high. |
| 145 | */ |
| 146 | |
| 147 | /* |
| 148 | * Function ma600_change_speed (dev, speed) |
| 149 | * |
| 150 | * Set the speed for the MA600 type dongle. |
| 151 | * |
| 152 | * Algorithm |
| 153 | * 1. Reset (already done by irda thread state machine) |
| 154 | * 2. clear RTS, set DTR and wait for 1ms |
| 155 | * 3. send Control Byte to the MA600 through TXD to set new baud rate |
| 156 | * wait until the stop bit of Control Byte is sent (for 9600 baud rate, |
| 157 | * it takes about 10 msec) |
| 158 | * 4. set RTS, set DTR (return to NORMAL Operation) |
| 159 | * 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here |
| 160 | * after |
| 161 | */ |
| 162 | |
| 163 | /* total delays are only about 20ms - let's just sleep for now to |
| 164 | * avoid the state machine complexity before we get things working |
| 165 | */ |
| 166 | |
| 167 | static int ma600_change_speed(struct sir_dev *dev, unsigned speed) |
| 168 | { |
| 169 | u8 byte; |
| 170 | |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 171 | pr_debug("%s(), speed=%d (was %d)\n", __func__, |
| 172 | speed, dev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* dongle already reset, dongle and port at default speed (9600) */ |
| 175 | |
| 176 | /* Set RTS low for 1 ms */ |
| 177 | sirdev_set_dtr_rts(dev, TRUE, FALSE); |
| 178 | mdelay(1); |
| 179 | |
| 180 | /* Write control byte */ |
| 181 | byte = get_control_byte(speed); |
| 182 | sirdev_raw_write(dev, &byte, sizeof(byte)); |
| 183 | |
| 184 | /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/ |
| 185 | msleep(15); /* old ma600 uses 15ms */ |
| 186 | |
| 187 | #if 1 |
| 188 | /* read-back of the control byte. ma600 is the first dongle driver |
| 189 | * which uses this so there might be some unidentified issues. |
| 190 | * Disable this in case of problems with readback. |
| 191 | */ |
| 192 | |
| 193 | sirdev_raw_read(dev, &byte, sizeof(byte)); |
| 194 | if (byte != get_control_byte(speed)) { |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 195 | net_warn_ratelimited("%s(): bad control byte read-back %02x != %02x\n", |
| 196 | __func__, (unsigned)byte, |
| 197 | (unsigned)get_control_byte(speed)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | return -1; |
| 199 | } |
| 200 | else |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 201 | pr_debug("%s() control byte write read OK\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | #endif |
| 203 | |
| 204 | /* Set DTR, Set RTS */ |
| 205 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 206 | |
| 207 | /* Wait at least 10ms */ |
| 208 | msleep(10); |
| 209 | |
| 210 | /* dongle is now switched to the new speed */ |
| 211 | dev->speed = speed; |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Function ma600_reset (dev) |
| 218 | * |
| 219 | * This function resets the ma600 dongle. |
| 220 | * |
| 221 | * Algorithm: |
| 222 | * 0. DTR=0, RTS=1 and wait 10 ms |
| 223 | * 1. DTR=1, RTS=1 and wait 10 ms |
| 224 | * 2. 9600 bps now |
| 225 | */ |
| 226 | |
| 227 | /* total delays are only about 20ms - let's just sleep for now to |
| 228 | * avoid the state machine complexity before we get things working |
| 229 | */ |
| 230 | |
Hannes Eder | 0e49e64 | 2008-12-26 00:03:19 -0800 | [diff] [blame] | 231 | static int ma600_reset(struct sir_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* Reset the dongle : set DTR low for 10 ms */ |
| 234 | sirdev_set_dtr_rts(dev, FALSE, TRUE); |
| 235 | msleep(10); |
| 236 | |
| 237 | /* Go back to normal mode */ |
| 238 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
| 239 | msleep(10); |
| 240 | |
| 241 | dev->speed = 9600; /* That's the dongle-default */ |
| 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95"); |
| 247 | MODULE_DESCRIPTION("MA600 dongle driver version 0.1"); |
| 248 | MODULE_LICENSE("GPL"); |
| 249 | MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */ |
| 250 | |
| 251 | module_init(ma600_sir_init); |
| 252 | module_exit(ma600_sir_cleanup); |
| 253 | |