251 lines
6.2 KiB
C
251 lines
6.2 KiB
C
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/*********************************************************************
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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 Troms<EFBFBD> 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/tty.h>
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#include <linux/init.h>
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#include <net/irda/irda.h>
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#include <net/irda/irda_device.h>
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static int girbil_reset(struct irda_task *task);
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static void girbil_open(dongle_t *self, struct qos_info *qos);
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static void girbil_close(dongle_t *self);
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static int girbil_change_speed(struct irda_task *task);
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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 emmited 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_reg dongle = {
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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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.change_speed = girbil_change_speed,
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.owner = THIS_MODULE,
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};
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static int __init girbil_init(void)
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{
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return irda_device_register_dongle(&dongle);
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}
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static void __exit girbil_cleanup(void)
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{
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irda_device_unregister_dongle(&dongle);
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}
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static void girbil_open(dongle_t *self, struct qos_info *qos)
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{
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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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}
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static void girbil_close(dongle_t *self)
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{
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/* Power off dongle */
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self->set_dtr_rts(self->dev, FALSE, FALSE);
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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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static int girbil_change_speed(struct irda_task *task)
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{
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dongle_t *self = (dongle_t *) task->instance;
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__u32 speed = (__u32) task->param;
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__u8 control[2];
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int ret = 0;
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self->speed_task = task;
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switch (task->state) {
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case IRDA_TASK_INIT:
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/* Need to reset the dongle and go to 9600 bps before
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programming */
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if (irda_task_execute(self, girbil_reset, NULL, task,
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(void *) speed))
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{
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/* Dongle need more time to reset */
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irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
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/* Give reset 1 sec to finish */
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ret = msecs_to_jiffies(1000);
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}
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break;
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case IRDA_TASK_CHILD_WAIT:
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IRDA_WARNING("%s(), resetting dongle timed out!\n",
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__FUNCTION__);
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ret = -1;
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break;
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case IRDA_TASK_CHILD_DONE:
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/* Set DTR and Clear RTS to enter command mode */
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self->set_dtr_rts(self->dev, FALSE, TRUE);
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switch (speed) {
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case 9600:
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default:
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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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self->write(self->dev, control, 2);
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irda_task_next_state(task, IRDA_TASK_WAIT);
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ret = msecs_to_jiffies(100);
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break;
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case IRDA_TASK_WAIT:
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/* Go back to normal mode */
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->speed_task = NULL;
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break;
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default:
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IRDA_ERROR("%s(), unknown state %d\n",
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__FUNCTION__, task->state);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->speed_task = NULL;
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ret = -1;
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break;
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}
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return 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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static int girbil_reset(struct irda_task *task)
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{
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dongle_t *self = (dongle_t *) task->instance;
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__u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
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int ret = 0;
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self->reset_task = task;
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switch (task->state) {
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case IRDA_TASK_INIT:
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/* Reset dongle */
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self->set_dtr_rts(self->dev, TRUE, FALSE);
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irda_task_next_state(task, IRDA_TASK_WAIT1);
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/* Sleep at least 5 ms */
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ret = msecs_to_jiffies(20);
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break;
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case IRDA_TASK_WAIT1:
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/* Set DTR and clear RTS to enter command mode */
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self->set_dtr_rts(self->dev, FALSE, TRUE);
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irda_task_next_state(task, IRDA_TASK_WAIT2);
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ret = msecs_to_jiffies(20);
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break;
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case IRDA_TASK_WAIT2:
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/* Write control byte */
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self->write(self->dev, &control, 1);
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irda_task_next_state(task, IRDA_TASK_WAIT3);
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ret = msecs_to_jiffies(20);
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break;
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case IRDA_TASK_WAIT3:
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/* Go back to normal mode */
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->reset_task = NULL;
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break;
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default:
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IRDA_ERROR("%s(), unknown state %d\n",
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__FUNCTION__, task->state);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->reset_task = NULL;
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ret = -1;
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break;
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}
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return 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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/*
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* Function init_module (void)
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*
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* Initialize Girbil module
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*
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*/
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module_init(girbil_init);
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/*
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* Function cleanup_module (void)
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*
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* Cleanup Girbil module
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*
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*/
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module_exit(girbil_cleanup);
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