/********************************************************************* * * Filename: ma600.c * Version: 0.1 * Description: Implementation of the MA600 dongle * Status: Experimental. * Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95 * Created at: Sat Jun 10 20:02:35 2000 * Modified at: Sat Aug 16 09:34:13 2003 * Modified by: Martin Diehl <mad@mdiehl.de> (modified for new sir_dev) * * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing * information on the MA600 dongle * * Copyright (c) 2000 Leung, All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * ********************************************************************/ #include <linux/module.h> #include <linux/delay.h> #include <linux/init.h> #include <net/irda/irda.h> #include "sir-dev.h" static int ma600_open(struct sir_dev *); static int ma600_close(struct sir_dev *); static int ma600_change_speed(struct sir_dev *, unsigned); static int ma600_reset(struct sir_dev *); /* control byte for MA600 */ #define MA600_9600 0x00 #define MA600_19200 0x01 #define MA600_38400 0x02 #define MA600_57600 0x03 #define MA600_115200 0x04 #define MA600_DEV_ID1 0x05 #define MA600_DEV_ID2 0x06 #define MA600_2400 0x08 static struct dongle_driver ma600 = { .owner = THIS_MODULE, .driver_name = "MA600", .type = IRDA_MA600_DONGLE, .open = ma600_open, .close = ma600_close, .reset = ma600_reset, .set_speed = ma600_change_speed, }; static int __init ma600_sir_init(void) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); return irda_register_dongle(&ma600); } static void __exit ma600_sir_cleanup(void) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); irda_unregister_dongle(&ma600); } /* Power on: (0) Clear RTS and DTR for 1 second (1) Set RTS and DTR for 1 second (2) 9600 bps now Note: assume RTS, DTR are clear before */ static int ma600_open(struct sir_dev *dev) { struct qos_info *qos = &dev->qos; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); sirdev_set_dtr_rts(dev, TRUE, TRUE); /* Explicitly set the speeds we can accept */ qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400 |IR_57600|IR_115200; /* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */ qos->min_turn_time.bits = 0x01; /* Needs at least 1 ms */ irda_qos_bits_to_value(qos); /* irda thread waits 50 msec for power settling */ return 0; } static int ma600_close(struct sir_dev *dev) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* Power off dongle */ sirdev_set_dtr_rts(dev, FALSE, FALSE); return 0; } static __u8 get_control_byte(__u32 speed) { __u8 byte; switch (speed) { default: case 115200: byte = MA600_115200; break; case 57600: byte = MA600_57600; break; case 38400: byte = MA600_38400; break; case 19200: byte = MA600_19200; break; case 9600: byte = MA600_9600; break; case 2400: byte = MA600_2400; break; } return byte; } /* * Function ma600_change_speed (dev, speed) * * Set the speed for the MA600 type dongle. * * The dongle has already been reset to a known state (dongle default) * We cycle through speeds by pulsing RTS low and then high. */ /* * Function ma600_change_speed (dev, speed) * * Set the speed for the MA600 type dongle. * * Algorithm * 1. Reset (already done by irda thread state machine) * 2. clear RTS, set DTR and wait for 1ms * 3. send Control Byte to the MA600 through TXD to set new baud rate * wait until the stop bit of Control Byte is sent (for 9600 baud rate, * it takes about 10 msec) * 4. set RTS, set DTR (return to NORMAL Operation) * 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here * after */ /* total delays are only about 20ms - let's just sleep for now to * avoid the state machine complexity before we get things working */ static int ma600_change_speed(struct sir_dev *dev, unsigned speed) { u8 byte; IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __FUNCTION__, speed, dev->speed); /* dongle already reset, dongle and port at default speed (9600) */ /* Set RTS low for 1 ms */ sirdev_set_dtr_rts(dev, TRUE, FALSE); mdelay(1); /* Write control byte */ byte = get_control_byte(speed); sirdev_raw_write(dev, &byte, sizeof(byte)); /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/ msleep(15); /* old ma600 uses 15ms */ #if 1 /* read-back of the control byte. ma600 is the first dongle driver * which uses this so there might be some unidentified issues. * Disable this in case of problems with readback. */ sirdev_raw_read(dev, &byte, sizeof(byte)); if (byte != get_control_byte(speed)) { IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n", __FUNCTION__, (unsigned) byte, (unsigned) get_control_byte(speed)); return -1; } else IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__); #endif /* Set DTR, Set RTS */ sirdev_set_dtr_rts(dev, TRUE, TRUE); /* Wait at least 10ms */ msleep(10); /* dongle is now switched to the new speed */ dev->speed = speed; return 0; } /* * Function ma600_reset (dev) * * This function resets the ma600 dongle. * * Algorithm: * 0. DTR=0, RTS=1 and wait 10 ms * 1. DTR=1, RTS=1 and wait 10 ms * 2. 9600 bps now */ /* total delays are only about 20ms - let's just sleep for now to * avoid the state machine complexity before we get things working */ int ma600_reset(struct sir_dev *dev) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* Reset the dongle : set DTR low for 10 ms */ sirdev_set_dtr_rts(dev, FALSE, TRUE); msleep(10); /* Go back to normal mode */ sirdev_set_dtr_rts(dev, TRUE, TRUE); msleep(10); dev->speed = 9600; /* That's the dongle-default */ return 0; } MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95"); MODULE_DESCRIPTION("MA600 dongle driver version 0.1"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */ module_init(ma600_sir_init); module_exit(ma600_sir_cleanup);