226 lines
5.6 KiB
C
226 lines
5.6 KiB
C
/*********************************************************************
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*
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* Filename: tekram.c
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* Version: 1.3
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* Description: Implementation of the Tekram IrMate IR-210B dongle
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Wed Oct 21 20:02:35 1998
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* Modified at: Sun Oct 27 22:02:38 2002
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* Modified by: Martin Diehl <mad@mdiehl.de>
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*
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* Copyright (c) 1998-1999 Dag Brattli,
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* Copyright (c) 2002 Martin Diehl,
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Neither Dag Brattli nor University of Tromsø admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <net/irda/irda.h>
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#include "sir-dev.h"
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static int tekram_delay = 150; /* default is 150 ms */
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module_param(tekram_delay, int, 0);
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MODULE_PARM_DESC(tekram_delay, "tekram dongle write complete delay");
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static int tekram_open(struct sir_dev *);
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static int tekram_close(struct sir_dev *);
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static int tekram_change_speed(struct sir_dev *, unsigned);
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static int tekram_reset(struct sir_dev *);
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#define TEKRAM_115200 0x00
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#define TEKRAM_57600 0x01
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#define TEKRAM_38400 0x02
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#define TEKRAM_19200 0x03
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#define TEKRAM_9600 0x04
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#define TEKRAM_PW 0x10 /* Pulse select bit */
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static struct dongle_driver tekram = {
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.owner = THIS_MODULE,
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.driver_name = "Tekram IR-210B",
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.type = IRDA_TEKRAM_DONGLE,
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.open = tekram_open,
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.close = tekram_close,
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.reset = tekram_reset,
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.set_speed = tekram_change_speed,
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};
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static int __init tekram_sir_init(void)
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{
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if (tekram_delay < 1 || tekram_delay > 500)
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tekram_delay = 200;
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pr_debug("%s - using %d ms delay\n",
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tekram.driver_name, tekram_delay);
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return irda_register_dongle(&tekram);
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}
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static void __exit tekram_sir_cleanup(void)
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{
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irda_unregister_dongle(&tekram);
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}
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static int tekram_open(struct sir_dev *dev)
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{
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struct qos_info *qos = &dev->qos;
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
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qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
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irda_qos_bits_to_value(qos);
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/* irda thread waits 50 msec for power settling */
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return 0;
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}
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static int tekram_close(struct sir_dev *dev)
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{
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/* Power off dongle */
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sirdev_set_dtr_rts(dev, FALSE, FALSE);
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return 0;
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}
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/*
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* Function tekram_change_speed (dev, state, speed)
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*
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* Set the speed for the Tekram IRMate 210 type dongle. Warning, this
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* function must be called with a process context!
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*
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* Algorithm
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* 1. clear DTR
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* 2. set RTS, and wait at least 7 us
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* 3. send Control Byte to the IR-210 through TXD to set new baud rate
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* wait until the stop bit of Control Byte is sent (for 9600 baud rate,
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* it takes about 100 msec)
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*
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* [oops, why 100 msec? sending 1 byte (10 bits) takes 1.05 msec
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* - is this probably to compensate for delays in tty layer?]
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*
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* 5. clear RTS (return to NORMAL Operation)
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* 6. wait at least 50 us, new setting (baud rate, etc) takes effect here
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* after
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*/
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#define TEKRAM_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1)
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static int tekram_change_speed(struct sir_dev *dev, unsigned speed)
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{
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unsigned state = dev->fsm.substate;
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unsigned delay = 0;
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u8 byte;
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static int ret = 0;
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switch(state) {
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case SIRDEV_STATE_DONGLE_SPEED:
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switch (speed) {
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default:
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speed = 9600;
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ret = -EINVAL;
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/* fall thru */
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case 9600:
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byte = TEKRAM_PW|TEKRAM_9600;
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break;
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case 19200:
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byte = TEKRAM_PW|TEKRAM_19200;
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break;
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case 38400:
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byte = TEKRAM_PW|TEKRAM_38400;
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break;
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case 57600:
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byte = TEKRAM_PW|TEKRAM_57600;
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break;
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case 115200:
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byte = TEKRAM_115200;
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break;
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}
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/* Set DTR, Clear RTS */
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sirdev_set_dtr_rts(dev, TRUE, FALSE);
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/* Wait at least 7us */
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udelay(14);
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/* Write control byte */
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sirdev_raw_write(dev, &byte, 1);
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dev->speed = speed;
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state = TEKRAM_STATE_WAIT_SPEED;
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delay = tekram_delay;
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break;
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case TEKRAM_STATE_WAIT_SPEED:
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/* Set DTR, Set RTS */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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udelay(50);
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break;
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default:
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net_err_ratelimited("%s - undefined state %d\n",
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__func__, state);
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ret = -EINVAL;
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break;
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}
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dev->fsm.substate = state;
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return (delay > 0) ? delay : ret;
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}
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/*
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* Function tekram_reset (driver)
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*
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* This function resets the tekram dongle. Warning, this function
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* must be called with a process context!!
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*
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* Algorithm:
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* 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 )
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* 1. clear RTS
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* 2. set DTR, and wait at least 1 ms
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* 3. clear DTR to SPACE state, wait at least 50 us for further
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* operation
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*/
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static int tekram_reset(struct sir_dev *dev)
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{
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/* Clear DTR, Set RTS */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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/* Should sleep 1 ms */
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msleep(1);
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/* Set DTR, Set RTS */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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/* Wait at least 50 us */
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udelay(75);
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dev->speed = 9600;
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return 0;
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}
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MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
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MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */
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module_init(tekram_sir_init);
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module_exit(tekram_sir_cleanup);
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