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258 lines
6.1 KiB
258 lines
6.1 KiB
/*********************************************************************
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*
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* Filename: girbil.c
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* Version: 1.2
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* Description: Implementation for the Greenwich GIrBIL dongle
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sat Feb 6 21:02:33 1999
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* Modified at: Fri Dec 17 09:13:20 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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* 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 girbil_reset(struct sir_dev *dev);
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static int girbil_open(struct sir_dev *dev);
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static int girbil_close(struct sir_dev *dev);
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static int girbil_change_speed(struct sir_dev *dev, unsigned speed);
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/* Control register 1 */
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#define GIRBIL_TXEN 0x01 /* Enable transmitter */
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#define GIRBIL_RXEN 0x02 /* Enable receiver */
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#define GIRBIL_ECAN 0x04 /* Cancel self emitted data */
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#define GIRBIL_ECHO 0x08 /* Echo control characters */
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/* LED Current Register (0x2) */
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#define GIRBIL_HIGH 0x20
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#define GIRBIL_MEDIUM 0x21
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#define GIRBIL_LOW 0x22
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/* Baud register (0x3) */
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#define GIRBIL_2400 0x30
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#define GIRBIL_4800 0x31
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#define GIRBIL_9600 0x32
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#define GIRBIL_19200 0x33
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#define GIRBIL_38400 0x34
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#define GIRBIL_57600 0x35
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#define GIRBIL_115200 0x36
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/* Mode register (0x4) */
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#define GIRBIL_IRDA 0x40
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#define GIRBIL_ASK 0x41
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/* Control register 2 (0x5) */
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#define GIRBIL_LOAD 0x51 /* Load the new baud rate value */
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static struct dongle_driver girbil = {
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.owner = THIS_MODULE,
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.driver_name = "Greenwich GIrBIL",
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.type = IRDA_GIRBIL_DONGLE,
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.open = girbil_open,
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.close = girbil_close,
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.reset = girbil_reset,
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.set_speed = girbil_change_speed,
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};
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static int __init girbil_sir_init(void)
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{
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return irda_register_dongle(&girbil);
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}
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static void __exit girbil_sir_cleanup(void)
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{
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irda_unregister_dongle(&girbil);
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}
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static int girbil_open(struct sir_dev *dev)
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{
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struct qos_info *qos = &dev->qos;
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IRDA_DEBUG(2, "%s()\n", __func__);
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/* Power on dongle */
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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 = 0x03;
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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 girbil_close(struct sir_dev *dev)
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{
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IRDA_DEBUG(2, "%s()\n", __func__);
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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 girbil_change_speed (dev, speed)
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*
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* Set the speed for the Girbil type dongle.
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*
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*/
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#define GIRBIL_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1)
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static int girbil_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 control[2];
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static int ret = 0;
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IRDA_DEBUG(2, "%s()\n", __func__);
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/* dongle alread reset - port and dongle at default speed */
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switch(state) {
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case SIRDEV_STATE_DONGLE_SPEED:
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/* Set DTR and Clear RTS to enter command mode */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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udelay(25); /* better wait a little while */
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ret = 0;
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switch (speed) {
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default:
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ret = -EINVAL;
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/* fall through */
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case 9600:
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control[0] = GIRBIL_9600;
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break;
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case 19200:
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control[0] = GIRBIL_19200;
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break;
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case 34800:
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control[0] = GIRBIL_38400;
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break;
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case 57600:
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control[0] = GIRBIL_57600;
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break;
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case 115200:
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control[0] = GIRBIL_115200;
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break;
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}
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control[1] = GIRBIL_LOAD;
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/* Write control bytes */
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sirdev_raw_write(dev, control, 2);
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dev->speed = speed;
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state = GIRBIL_STATE_WAIT_SPEED;
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delay = 100;
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break;
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case GIRBIL_STATE_WAIT_SPEED:
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/* Go back to normal mode */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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udelay(25); /* better wait a little while */
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break;
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default:
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IRDA_ERROR("%s - undefined state %d\n", __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 girbil_reset (driver)
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*
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* This function resets the girbil dongle.
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*
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* Algorithm:
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* 0. set RTS, and wait at least 5 ms
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* 1. clear RTS
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*/
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#define GIRBIL_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET + 1)
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#define GIRBIL_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET + 2)
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#define GIRBIL_STATE_WAIT3_RESET (SIRDEV_STATE_DONGLE_RESET + 3)
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static int girbil_reset(struct sir_dev *dev)
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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 control = GIRBIL_TXEN | GIRBIL_RXEN;
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int ret = 0;
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IRDA_DEBUG(2, "%s()\n", __func__);
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switch (state) {
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case SIRDEV_STATE_DONGLE_RESET:
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/* Reset dongle */
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sirdev_set_dtr_rts(dev, TRUE, FALSE);
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/* Sleep at least 5 ms */
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delay = 20;
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state = GIRBIL_STATE_WAIT1_RESET;
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break;
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case GIRBIL_STATE_WAIT1_RESET:
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/* Set DTR and clear RTS to enter command mode */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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delay = 20;
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state = GIRBIL_STATE_WAIT2_RESET;
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break;
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case GIRBIL_STATE_WAIT2_RESET:
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/* Write control byte */
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sirdev_raw_write(dev, &control, 1);
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delay = 20;
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state = GIRBIL_STATE_WAIT3_RESET;
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break;
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case GIRBIL_STATE_WAIT3_RESET:
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/* Go back to normal mode */
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sirdev_set_dtr_rts(dev, TRUE, TRUE);
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dev->speed = 9600;
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break;
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default:
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IRDA_ERROR("%s(), undefined state %d\n", __func__, state);
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ret = -1;
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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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MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
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MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
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module_init(girbil_sir_init);
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module_exit(girbil_sir_cleanup);
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