200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/*********************************************************************
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*
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* Filename: litelink.c
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* Version: 1.1
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* Description: Driver for the Parallax LiteLink dongle
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* Status: Stable
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Fri May 7 12:50:33 1999
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* Modified at: Fri Dec 17 09:14:23 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1999 Dag Brattli, 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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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********************************************************************/
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/*
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* Modified at: Thu Jan 15 2003
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* Modified by: Eugene Crosser <crosser@average.org>
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*
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* Convert to "new" IRDA infrastructure for kernel 2.6
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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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#define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */
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#define MAX_DELAY 10000 /* 1 ms */
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static int litelink_open(struct sir_dev *dev);
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static int litelink_close(struct sir_dev *dev);
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static int litelink_change_speed(struct sir_dev *dev, unsigned speed);
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static int litelink_reset(struct sir_dev *dev);
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/* These are the baudrates supported - 9600 must be last one! */
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static unsigned baud_rates[] = { 115200, 57600, 38400, 19200, 9600 };
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static struct dongle_driver litelink = {
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.owner = THIS_MODULE,
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.driver_name = "Parallax LiteLink",
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.type = IRDA_LITELINK_DONGLE,
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.open = litelink_open,
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.close = litelink_close,
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.reset = litelink_reset,
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.set_speed = litelink_change_speed,
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};
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static int __init litelink_sir_init(void)
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{
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return irda_register_dongle(&litelink);
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}
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static void __exit litelink_sir_cleanup(void)
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{
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irda_unregister_dongle(&litelink);
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}
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static int litelink_open(struct sir_dev *dev)
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{
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struct qos_info *qos = &dev->qos;
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/* Power up dongle */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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/* Set the speeds we can accept */
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qos->baud_rate.bits &= IR_115200|IR_57600|IR_38400|IR_19200|IR_9600;
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qos->min_turn_time.bits = 0x7f; /* Needs 0.01 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 litelink_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 litelink_change_speed (task)
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*
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* Change speed of the Litelink dongle. To cycle through the available
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* baud rates, pulse RTS low for a few ms.
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*/
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static int litelink_change_speed(struct sir_dev *dev, unsigned speed)
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{
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int i;
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/* dongle already reset by irda-thread - current speed (dongle and
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* port) is the default speed (115200 for litelink!)
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*/
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/* Cycle through avaiable baudrates until we reach the correct one */
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for (i = 0; baud_rates[i] != speed; i++) {
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/* end-of-list reached due to invalid speed request */
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if (baud_rates[i] == 9600)
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break;
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/* Set DTR, clear RTS */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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/* Sleep a minimum of 15 us */
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udelay(MIN_DELAY);
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/* Set DTR, Set RTS */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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/* Sleep a minimum of 15 us */
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udelay(MIN_DELAY);
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}
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dev->speed = baud_rates[i];
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/* invalid baudrate should not happen - but if, we return -EINVAL and
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* the dongle configured for 9600 so the stack has a chance to recover
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*/
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return (dev->speed == speed) ? 0 : -EINVAL;
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}
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/*
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* Function litelink_reset (task)
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*
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* Reset the Litelink type dongle.
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*
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*/
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static int litelink_reset(struct sir_dev *dev)
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{
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/* probably the power-up can be dropped here, but with only
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* 15 usec delay it's not worth the risk unless somebody with
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* the hardware confirms it doesn't break anything...
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*/
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/* Power on dongle */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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/* Sleep a minimum of 15 us */
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udelay(MIN_DELAY);
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/* Clear RTS to reset dongle */
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sirdev_set_dtr_rts(dev, TRUE, FALSE);
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/* Sleep a minimum of 15 us */
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udelay(MIN_DELAY);
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/* Go back to normal mode */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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/* Sleep a minimum of 15 us */
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udelay(MIN_DELAY);
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/* This dongles speed defaults to 115200 bps */
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dev->speed = 115200;
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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("Parallax Litelink dongle driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-5"); /* IRDA_LITELINK_DONGLE */
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/*
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* Function init_module (void)
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*
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* Initialize Litelink module
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*
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*/
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module_init(litelink_sir_init);
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/*
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* Function cleanup_module (void)
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*
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* Cleanup Litelink module
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*
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*/
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module_exit(litelink_sir_cleanup);
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