283 lines
7.0 KiB
C
283 lines
7.0 KiB
C
/*********************************************************************
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*
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* Filename: tekram.c
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* Version: 1.2
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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: Fri Dec 17 09:13:09 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1998-1999 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/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 void tekram_open(dongle_t *self, struct qos_info *qos);
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static void tekram_close(dongle_t *self);
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static int tekram_change_speed(struct irda_task *task);
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static int tekram_reset(struct irda_task *task);
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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_reg dongle = {
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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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.change_speed = tekram_change_speed,
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.owner = THIS_MODULE,
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};
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static int __init tekram_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 tekram_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 tekram_open(dongle_t *self, struct qos_info *qos)
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{
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
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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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}
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static void tekram_close(dongle_t *self)
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{
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
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/* Power off dongle */
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self->set_dtr_rts(self->dev, FALSE, FALSE);
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if (self->reset_task)
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irda_task_delete(self->reset_task);
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if (self->speed_task)
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irda_task_delete(self->speed_task);
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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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* 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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static int tekram_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 byte;
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int ret = 0;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
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IRDA_ASSERT(task != NULL, return -1;);
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if (self->speed_task && self->speed_task != task) {
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IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
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return msecs_to_jiffies(10);
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} else
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self->speed_task = task;
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switch (speed) {
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default:
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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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switch (task->state) {
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case IRDA_TASK_INIT:
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case IRDA_TASK_CHILD_INIT:
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/*
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* Need to reset the dongle and go to 9600 bps before
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* programming
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*/
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if (irda_task_execute(self, tekram_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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} else
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irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
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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, Clear RTS */
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self->set_dtr_rts(self->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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self->write(self->dev, &byte, 1);
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irda_task_next_state(task, IRDA_TASK_WAIT);
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/* Wait at least 100 ms */
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ret = msecs_to_jiffies(150);
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break;
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case IRDA_TASK_WAIT:
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/* Set DTR, Set RTS */
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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 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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int tekram_reset(struct irda_task *task)
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{
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dongle_t *self = (dongle_t *) task->instance;
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int ret = 0;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
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IRDA_ASSERT(task != NULL, return -1;);
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if (self->reset_task && self->reset_task != task) {
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IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
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return msecs_to_jiffies(10);
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} else
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self->reset_task = task;
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/* Power off dongle */
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//self->set_dtr_rts(self->dev, FALSE, FALSE);
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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switch (task->state) {
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case IRDA_TASK_INIT:
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irda_task_next_state(task, IRDA_TASK_WAIT1);
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/* Sleep 50 ms */
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ret = msecs_to_jiffies(50);
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break;
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case IRDA_TASK_WAIT1:
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/* Clear DTR, Set RTS */
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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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/* Should sleep 1 ms */
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ret = msecs_to_jiffies(1);
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break;
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case IRDA_TASK_WAIT2:
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/* Set DTR, Set RTS */
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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/* Wait at least 50 us */
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udelay(75);
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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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}
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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("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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/*
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* Function init_module (void)
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*
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* Initialize Tekram module
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*
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*/
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module_init(tekram_init);
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/*
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* Function cleanup_module (void)
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*
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* Cleanup Tekram module
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*
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*/
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module_exit(tekram_cleanup);
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