254 lines
6.5 KiB
C
254 lines
6.5 KiB
C
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/*********************************************************************
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*
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* Filename: ma600.c
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* Version: 0.1
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* Description: Implementation of the MA600 dongle
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* Status: Experimental.
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* Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
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* Created at: Sat Jun 10 20:02:35 2000
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* Modified at: Sat Aug 16 09:34:13 2003
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* Modified by: Martin Diehl <mad@mdiehl.de> (modified for new sir_dev)
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*
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* Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
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* information on the MA600 dongle
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*
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* Copyright (c) 2000 Leung, 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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#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 ma600_open(struct sir_dev *);
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static int ma600_close(struct sir_dev *);
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static int ma600_change_speed(struct sir_dev *, unsigned);
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static int ma600_reset(struct sir_dev *);
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/* control byte for MA600 */
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#define MA600_9600 0x00
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#define MA600_19200 0x01
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#define MA600_38400 0x02
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#define MA600_57600 0x03
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#define MA600_115200 0x04
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#define MA600_DEV_ID1 0x05
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#define MA600_DEV_ID2 0x06
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#define MA600_2400 0x08
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static struct dongle_driver ma600 = {
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.owner = THIS_MODULE,
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.driver_name = "MA600",
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.type = IRDA_MA600_DONGLE,
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.open = ma600_open,
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.close = ma600_close,
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.reset = ma600_reset,
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.set_speed = ma600_change_speed,
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};
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static int __init ma600_sir_init(void)
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{
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return irda_register_dongle(&ma600);
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}
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static void __exit ma600_sir_cleanup(void)
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{
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irda_unregister_dongle(&ma600);
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}
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/*
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Power on:
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(0) Clear RTS and DTR for 1 second
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(1) Set RTS and DTR for 1 second
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(2) 9600 bps now
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Note: assume RTS, DTR are clear before
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*/
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static int ma600_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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/* Explicitly set the speeds we can accept */
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qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
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|IR_57600|IR_115200;
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/* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
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qos->min_turn_time.bits = 0x01; /* Needs at least 1 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 ma600_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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static __u8 get_control_byte(__u32 speed)
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{
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__u8 byte;
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switch (speed) {
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default:
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case 115200:
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byte = MA600_115200;
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break;
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case 57600:
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byte = MA600_57600;
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break;
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case 38400:
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byte = MA600_38400;
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break;
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case 19200:
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byte = MA600_19200;
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break;
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case 9600:
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byte = MA600_9600;
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break;
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case 2400:
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byte = MA600_2400;
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break;
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}
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return byte;
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}
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/*
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* Function ma600_change_speed (dev, speed)
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*
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* Set the speed for the MA600 type dongle.
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*
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* The dongle has already been reset to a known state (dongle default)
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* We cycle through speeds by pulsing RTS low and then high.
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*/
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/*
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* Function ma600_change_speed (dev, speed)
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*
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* Set the speed for the MA600 type dongle.
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*
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* Algorithm
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* 1. Reset (already done by irda thread state machine)
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* 2. clear RTS, set DTR and wait for 1ms
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* 3. send Control Byte to the MA600 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 10 msec)
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* 4. set RTS, set DTR (return to NORMAL Operation)
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* 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
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* after
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*/
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/* total delays are only about 20ms - let's just sleep for now to
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* avoid the state machine complexity before we get things working
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*/
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static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
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{
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u8 byte;
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pr_debug("%s(), speed=%d (was %d)\n", __func__,
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speed, dev->speed);
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/* dongle already reset, dongle and port at default speed (9600) */
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/* Set RTS low for 1 ms */
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sirdev_set_dtr_rts(dev, TRUE, FALSE);
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mdelay(1);
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/* Write control byte */
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byte = get_control_byte(speed);
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sirdev_raw_write(dev, &byte, sizeof(byte));
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/* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
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msleep(15); /* old ma600 uses 15ms */
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#if 1
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/* read-back of the control byte. ma600 is the first dongle driver
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* which uses this so there might be some unidentified issues.
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* Disable this in case of problems with readback.
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*/
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sirdev_raw_read(dev, &byte, sizeof(byte));
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if (byte != get_control_byte(speed)) {
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net_warn_ratelimited("%s(): bad control byte read-back %02x != %02x\n",
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__func__, (unsigned)byte,
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(unsigned)get_control_byte(speed));
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return -1;
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}
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else
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pr_debug("%s() control byte write read OK\n", __func__);
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#endif
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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 10ms */
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msleep(10);
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/* dongle is now switched to the new speed */
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dev->speed = speed;
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return 0;
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}
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/*
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* Function ma600_reset (dev)
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*
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* This function resets the ma600 dongle.
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*
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* Algorithm:
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* 0. DTR=0, RTS=1 and wait 10 ms
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* 1. DTR=1, RTS=1 and wait 10 ms
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* 2. 9600 bps now
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*/
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/* total delays are only about 20ms - let's just sleep for now to
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* avoid the state machine complexity before we get things working
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*/
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static int ma600_reset(struct sir_dev *dev)
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{
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/* Reset the dongle : set DTR low for 10 ms */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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msleep(10);
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/* Go back to normal mode */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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msleep(10);
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dev->speed = 9600; /* That's the dongle-default */
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return 0;
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}
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MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
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MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
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module_init(ma600_sir_init);
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module_exit(ma600_sir_cleanup);
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