258 lines
7.0 KiB
C
258 lines
7.0 KiB
C
/*********************************************************************
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*
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* Filename: act200l.c
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* Version: 0.8
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* Description: Implementation for the ACTiSYS ACT-IR200L dongle
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* Status: Experimental.
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* Author: SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
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* Created at: Fri Aug 3 17:35:42 2001
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* Modified at: Fri Aug 17 10:22:40 2001
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* Modified by: SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
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*
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* Copyright (c) 2001 SHIMIZU Takuya, 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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********************************************************************/
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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 act200l_reset(struct sir_dev *dev);
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static int act200l_open(struct sir_dev *dev);
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static int act200l_close(struct sir_dev *dev);
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static int act200l_change_speed(struct sir_dev *dev, unsigned speed);
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/* Regsiter 0: Control register #1 */
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#define ACT200L_REG0 0x00
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#define ACT200L_TXEN 0x01 /* Enable transmitter */
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#define ACT200L_RXEN 0x02 /* Enable receiver */
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/* Register 1: Control register #2 */
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#define ACT200L_REG1 0x10
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#define ACT200L_LODB 0x01 /* Load new baud rate count value */
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#define ACT200L_WIDE 0x04 /* Expand the maximum allowable pulse */
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/* Register 4: Output Power register */
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#define ACT200L_REG4 0x40
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#define ACT200L_OP0 0x01 /* Enable LED1C output */
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#define ACT200L_OP1 0x02 /* Enable LED2C output */
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#define ACT200L_BLKR 0x04
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/* Register 5: Receive Mode register */
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#define ACT200L_REG5 0x50
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#define ACT200L_RWIDL 0x01 /* fixed 1.6us pulse mode */
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/* Register 6: Receive Sensitivity register #1 */
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#define ACT200L_REG6 0x60
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#define ACT200L_RS0 0x01 /* receive threshold bit 0 */
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#define ACT200L_RS1 0x02 /* receive threshold bit 1 */
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/* Register 7: Receive Sensitivity register #2 */
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#define ACT200L_REG7 0x70
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#define ACT200L_ENPOS 0x04 /* Ignore the falling edge */
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/* Register 8,9: Baud Rate Dvider register #1,#2 */
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#define ACT200L_REG8 0x80
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#define ACT200L_REG9 0x90
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#define ACT200L_2400 0x5f
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#define ACT200L_9600 0x17
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#define ACT200L_19200 0x0b
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#define ACT200L_38400 0x05
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#define ACT200L_57600 0x03
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#define ACT200L_115200 0x01
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/* Register 13: Control register #3 */
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#define ACT200L_REG13 0xd0
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#define ACT200L_SHDW 0x01 /* Enable access to shadow registers */
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/* Register 15: Status register */
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#define ACT200L_REG15 0xf0
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/* Register 21: Control register #4 */
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#define ACT200L_REG21 0x50
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#define ACT200L_EXCK 0x02 /* Disable clock output driver */
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#define ACT200L_OSCL 0x04 /* oscillator in low power, medium accuracy mode */
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static struct dongle_driver act200l = {
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.owner = THIS_MODULE,
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.driver_name = "ACTiSYS ACT-IR200L",
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.type = IRDA_ACT200L_DONGLE,
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.open = act200l_open,
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.close = act200l_close,
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.reset = act200l_reset,
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.set_speed = act200l_change_speed,
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};
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static int __init act200l_sir_init(void)
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{
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return irda_register_dongle(&act200l);
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}
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static void __exit act200l_sir_cleanup(void)
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{
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irda_unregister_dongle(&act200l);
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}
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static int act200l_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 the 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_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 act200l_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 the 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 act200l_change_speed (dev, speed)
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*
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* Set the speed for the ACTiSYS ACT-IR200L type dongle.
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*
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*/
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static int act200l_change_speed(struct sir_dev *dev, unsigned speed)
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{
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u8 control[3];
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int ret = 0;
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IRDA_DEBUG(2, "%s()\n", __func__ );
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/* Clear DTR and set RTS to enter command mode */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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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] = ACT200L_REG8 | (ACT200L_9600 & 0x0f);
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control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);
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break;
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case 19200:
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control[0] = ACT200L_REG8 | (ACT200L_19200 & 0x0f);
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control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);
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break;
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case 38400:
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control[0] = ACT200L_REG8 | (ACT200L_38400 & 0x0f);
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control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);
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break;
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case 57600:
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control[0] = ACT200L_REG8 | (ACT200L_57600 & 0x0f);
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control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);
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break;
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case 115200:
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control[0] = ACT200L_REG8 | (ACT200L_115200 & 0x0f);
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control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);
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break;
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}
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control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;
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/* Write control bytes */
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sirdev_raw_write(dev, control, 3);
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msleep(5);
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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 = speed;
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return ret;
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}
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/*
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* Function act200l_reset (driver)
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*
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* Reset the ACTiSYS ACT-IR200L type dongle.
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*/
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#define ACT200L_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET+1)
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#define ACT200L_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET+2)
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static int act200l_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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static const u8 control[9] = {
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ACT200L_REG15,
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ACT200L_REG13 | ACT200L_SHDW,
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ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
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ACT200L_REG13,
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ACT200L_REG7 | ACT200L_ENPOS,
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ACT200L_REG6 | ACT200L_RS0 | ACT200L_RS1,
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ACT200L_REG5 | ACT200L_RWIDL,
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ACT200L_REG4 | ACT200L_OP0 | ACT200L_OP1 | ACT200L_BLKR,
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ACT200L_REG0 | ACT200L_TXEN | ACT200L_RXEN
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};
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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 the dongle : set RTS low for 25 ms */
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sirdev_set_dtr_rts(dev, TRUE, FALSE);
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state = ACT200L_STATE_WAIT1_RESET;
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delay = 50;
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break;
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case ACT200L_STATE_WAIT1_RESET:
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/* Clear DTR and set RTS to enter command mode */
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sirdev_set_dtr_rts(dev, FALSE, TRUE);
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udelay(25); /* better wait for some short while */
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/* Write control bytes */
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sirdev_raw_write(dev, control, sizeof(control));
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state = ACT200L_STATE_WAIT2_RESET;
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delay = 15;
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break;
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case ACT200L_STATE_WAIT2_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(), unknown 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("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
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MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
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module_init(act200l_sir_init);
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module_exit(act200l_sir_cleanup);
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