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, write to the Free Software
  29  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  *     MA 02111-1307 USA
  31  *
  32  ********************************************************************/
  33
  34 #include <linux/module.h>
  35 #include <linux/delay.h>
  36 #include <linux/init.h>
  37
  38 #include <net/irda/irda.h>
  39
  40 #include "sir-dev.h"
  41
  42 static int ma600_open(struct sir_dev *);
  43 static int ma600_close(struct sir_dev *);
  44 static int ma600_change_speed(struct sir_dev *, unsigned);
  45 static int ma600_reset(struct sir_dev *);
  46
  47 /* control byte for MA600 */
  48 #define MA600_9600      0x00
  49 #define MA600_19200     0x01
  50 #define MA600_38400     0x02
  51 #define MA600_57600     0x03
  52 #define MA600_115200    0x04
  53 #define MA600_DEV_ID1   0x05
  54 #define MA600_DEV_ID2   0x06
  55 #define MA600_2400      0x08
  56
  57 static struct dongle_driver ma600 = {
  58         .owner          = THIS_MODULE,
  59         .driver_name    = "MA600",
  60         .type           = IRDA_MA600_DONGLE,
  61         .open           = ma600_open,
  62         .close          = ma600_close,
  63         .reset          = ma600_reset,
  64         .set_speed      = ma600_change_speed,
  65 };
  66
  67
  68 static int __init ma600_sir_init(void)
  69 {
  70         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
  71         return irda_register_dongle(&ma600);
  72 }
  73
  74 static void __exit ma600_sir_cleanup(void)
  75 {
  76         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
  77         irda_unregister_dongle(&ma600);
  78 }
  79
  80 /*
  81         Power on:
  82                 (0) Clear RTS and DTR for 1 second
  83                 (1) Set RTS and DTR for 1 second
  84                 (2) 9600 bps now
  85         Note: assume RTS, DTR are clear before
  86 */
  87 static int ma600_open(struct sir_dev *dev)
  88 {
  89         struct qos_info *qos = &dev->qos;
  90
  91         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
  92
  93         sirdev_set_dtr_rts(dev, TRUE, TRUE);
  94
  95         /* Explicitly set the speeds we can accept */
  96         qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
  97                                 |IR_57600|IR_115200;
  98         /* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
  99         qos->min_turn_time.bits = 0x01;         /* Needs at least 1 ms */
 100         irda_qos_bits_to_value(qos);
 101
 102         /* irda thread waits 50 msec for power settling */
 103
 104         return 0;
 105 }
 106
 107 static int ma600_close(struct sir_dev *dev)
 108 {
 109         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 110
 111         /* Power off dongle */
 112         sirdev_set_dtr_rts(dev, FALSE, FALSE);
 113
 114         return 0;
 115 }
 116
 117 static __u8 get_control_byte(__u32 speed)
 118 {
 119         __u8 byte;
 120
 121         switch (speed) {
 122         default:
 123         case 115200:
 124                 byte = MA600_115200;
 125                 break;
 126         case 57600:
 127                 byte = MA600_57600;
 128                 break;
 129         case 38400:
 130                 byte = MA600_38400;
 131                 break;
 132         case 19200:
 133                 byte = MA600_19200;
 134                 break;
 135         case 9600:
 136                 byte = MA600_9600;
 137                 break;
 138         case 2400:
 139                 byte = MA600_2400;
 140                 break;
 141         }
 142
 143         return byte;
 144 }
 145
 146 /*
 147  * Function ma600_change_speed (dev, speed)
 148  *
 149  *    Set the speed for the MA600 type dongle.
 150  *
 151  *    The dongle has already been reset to a known state (dongle default)
 152  *    We cycle through speeds by pulsing RTS low and then high.
 153  */
 154
 155 /*
 156  * Function ma600_change_speed (dev, speed)
 157  *
 158  *    Set the speed for the MA600 type dongle.
 159  *
 160  *    Algorithm
 161  *    1. Reset (already done by irda thread state machine)
 162  *    2. clear RTS, set DTR and wait for 1ms
 163  *    3. send Control Byte to the MA600 through TXD to set new baud rate
 164  *       wait until the stop bit of Control Byte is sent (for 9600 baud rate,
 165  *       it takes about 10 msec)
 166  *    4. set RTS, set DTR (return to NORMAL Operation)
 167  *    5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
 168  *       after
 169  */
 170
 171 /* total delays are only about 20ms - let's just sleep for now to
 172  * avoid the state machine complexity before we get things working
 173  */
 174
 175 static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
 176 {
 177         u8      byte;
 178
 179         IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __FUNCTION__,
 180                 speed, dev->speed);
 181
 182         /* dongle already reset, dongle and port at default speed (9600) */
 183
 184         /* Set RTS low for 1 ms */
 185         sirdev_set_dtr_rts(dev, TRUE, FALSE);
 186         mdelay(1);
 187
 188         /* Write control byte */
 189         byte = get_control_byte(speed);
 190         sirdev_raw_write(dev, &byte, sizeof(byte));
 191
 192         /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
 193         msleep(15);                                     /* old ma600 uses 15ms */
 194
 195 #if 1
 196         /* read-back of the control byte. ma600 is the first dongle driver
 197          * which uses this so there might be some unidentified issues.
 198          * Disable this in case of problems with readback.
 199          */
 200
 201         sirdev_raw_read(dev, &byte, sizeof(byte));
 202         if (byte != get_control_byte(speed))  {
 203                 IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
 204                              __FUNCTION__, (unsigned) byte,
 205                              (unsigned) get_control_byte(speed));
 206                 return -1;
 207         }
 208         else
 209                 IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__);
 210 #endif
 211
 212         /* Set DTR, Set RTS */
 213         sirdev_set_dtr_rts(dev, TRUE, TRUE);
 214
 215         /* Wait at least 10ms */
 216         msleep(10);
 217
 218         /* dongle is now switched to the new speed */
 219         dev->speed = speed;
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Function ma600_reset (dev)
 226  *
 227  *      This function resets the ma600 dongle.
 228  *
 229  *      Algorithm:
 230  *        0. DTR=0, RTS=1 and wait 10 ms
 231  *        1. DTR=1, RTS=1 and wait 10 ms
 232  *        2. 9600 bps now
 233  */
 234
 235 /* total delays are only about 20ms - let's just sleep for now to
 236  * avoid the state machine complexity before we get things working
 237  */
 238
 239 int ma600_reset(struct sir_dev *dev)
 240 {
 241         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 242
 243         /* Reset the dongle : set DTR low for 10 ms */
 244         sirdev_set_dtr_rts(dev, FALSE, TRUE);
 245         msleep(10);
 246
 247         /* Go back to normal mode */
 248         sirdev_set_dtr_rts(dev, TRUE, TRUE);
 249         msleep(10);
 250
 251         dev->speed = 9600;      /* That's the dongle-default */
 252
 253         return 0;
 254 }
 255
 256 MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
 257 MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
 258 MODULE_LICENSE("GPL");
 259 MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
 260
 261 module_init(ma600_sir_init);
 262 module_exit(ma600_sir_cleanup);
 263