drivers/net/irda/ma600-sir.c

   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
  28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/module.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  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 {
  68         IRDA_DEBUG(2, "%s()\n", __func__);
  69         return irda_register_dongle(&ma600);
  70 }
  71
  72 static void __exit ma600_sir_cleanup(void)
  73 {
  74         IRDA_DEBUG(2, "%s()\n", __func__);
  75         irda_unregister_dongle(&ma600);
  76 }
  77
  78 /*
  79         Power on:
  80                 (0) Clear RTS and DTR for 1 second
  81                 (1) Set RTS and DTR for 1 second
  82                 (2) 9600 bps now
  83         Note: assume RTS, DTR are clear before
  84 */
  85 static int ma600_open(struct sir_dev *dev)
  86 {
  87         struct qos_info *qos = &dev->qos;
  88
  89         IRDA_DEBUG(2, "%s()\n", __func__);
  90
  91         sirdev_set_dtr_rts(dev, TRUE, TRUE);
  92
  93         /* Explicitly set the speeds we can accept */
  94         qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
  95                                 |IR_57600|IR_115200;
  96         /* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
  97         qos->min_turn_time.bits = 0x01;         /* Needs at least 1 ms */
  98         irda_qos_bits_to_value(qos);
  99
 100         /* irda thread waits 50 msec for power settling */
 101
 102         return 0;
 103 }
 104
 105 static int ma600_close(struct sir_dev *dev)
 106 {
 107         IRDA_DEBUG(2, "%s()\n", __func__);
 108
 109         /* Power off dongle */
 110         sirdev_set_dtr_rts(dev, FALSE, FALSE);
 111
 112         return 0;
 113 }
 114
 115 static __u8 get_control_byte(__u32 speed)
 116 {
 117         __u8 byte;
 118
 119         switch (speed) {
 120         default:
 121         case 115200:
 122                 byte = MA600_115200;
 123                 break;
 124         case 57600:
 125                 byte = MA600_57600;
 126                 break;
 127         case 38400:
 128                 byte = MA600_38400;
 129                 break;
 130         case 19200:
 131                 byte = MA600_19200;
 132                 break;
 133         case 9600:
 134                 byte = MA600_9600;
 135                 break;
 136         case 2400:
 137                 byte = MA600_2400;
 138                 break;
 139         }
 140
 141         return byte;
 142 }
 143
 144 /*
 145  * Function ma600_change_speed (dev, speed)
 146  *
 147  *    Set the speed for the MA600 type dongle.
 148  *
 149  *    The dongle has already been reset to a known state (dongle default)
 150  *    We cycle through speeds by pulsing RTS low and then high.
 151  */
 152
 153 /*
 154  * Function ma600_change_speed (dev, speed)
 155  *
 156  *    Set the speed for the MA600 type dongle.
 157  *
 158  *    Algorithm
 159  *    1. Reset (already done by irda thread state machine)
 160  *    2. clear RTS, set DTR and wait for 1ms
 161  *    3. send Control Byte to the MA600 through TXD to set new baud rate
 162  *       wait until the stop bit of Control Byte is sent (for 9600 baud rate,
 163  *       it takes about 10 msec)
 164  *    4. set RTS, set DTR (return to NORMAL Operation)
 165  *    5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
 166  *       after
 167  */
 168
 169 /* total delays are only about 20ms - let's just sleep for now to
 170  * avoid the state machine complexity before we get things working
 171  */
 172
 173 static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
 174 {
 175         u8      byte;
 176
 177         IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __func__,
 178                 speed, dev->speed);
 179
 180         /* dongle already reset, dongle and port at default speed (9600) */
 181
 182         /* Set RTS low for 1 ms */
 183         sirdev_set_dtr_rts(dev, TRUE, FALSE);
 184         mdelay(1);
 185
 186         /* Write control byte */
 187         byte = get_control_byte(speed);
 188         sirdev_raw_write(dev, &byte, sizeof(byte));
 189
 190         /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
 191         msleep(15);                                     /* old ma600 uses 15ms */
 192
 193 #if 1
 194         /* read-back of the control byte. ma600 is the first dongle driver
 195          * which uses this so there might be some unidentified issues.
 196          * Disable this in case of problems with readback.
 197          */
 198
 199         sirdev_raw_read(dev, &byte, sizeof(byte));
 200         if (byte != get_control_byte(speed))  {
 201                 IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
 202                              __func__, (unsigned) byte,
 203                              (unsigned) get_control_byte(speed));
 204                 return -1;
 205         }
 206         else
 207                 IRDA_DEBUG(2, "%s() control byte write read OK\n", __func__);
 208 #endif
 209
 210         /* Set DTR, Set RTS */
 211         sirdev_set_dtr_rts(dev, TRUE, TRUE);
 212
 213         /* Wait at least 10ms */
 214         msleep(10);
 215
 216         /* dongle is now switched to the new speed */
 217         dev->speed = speed;
 218
 219         return 0;
 220 }
 221
 222 /*
 223  * Function ma600_reset (dev)
 224  *
 225  *      This function resets the ma600 dongle.
 226  *
 227  *      Algorithm:
 228  *        0. DTR=0, RTS=1 and wait 10 ms
 229  *        1. DTR=1, RTS=1 and wait 10 ms
 230  *        2. 9600 bps now
 231  */
 232
 233 /* total delays are only about 20ms - let's just sleep for now to
 234  * avoid the state machine complexity before we get things working
 235  */
 236
 237 static int ma600_reset(struct sir_dev *dev)
 238 {
 239         IRDA_DEBUG(2, "%s()\n", __func__);
 240
 241         /* Reset the dongle : set DTR low for 10 ms */
 242         sirdev_set_dtr_rts(dev, FALSE, TRUE);
 243         msleep(10);
 244
 245         /* Go back to normal mode */
 246         sirdev_set_dtr_rts(dev, TRUE, TRUE);
 247         msleep(10);
 248
 249         dev->speed = 9600;      /* That's the dongle-default */
 250
 251         return 0;
 252 }
 253
 254 MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
 255 MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
 256 MODULE_LICENSE("GPL");
 257 MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
 258
 259 module_init(ma600_sir_init);
 260 module_exit(ma600_sir_cleanup);
 261