/********************************************************************* * * Filename: girbil.c * Version: 1.2 * Description: Implementation for the Greenwich GIrBIL dongle * Status: Experimental. * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Sat Feb 6 21:02:33 1999 * Modified at: Fri Dec 17 09:13:20 1999 * Modified by: Dag Brattli <dagb@cs.uit.no> * * Copyright (c) 1999 Dag Brattli, All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * Neither Dag Brattli nor University of Tromsø admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * ********************************************************************/ #include <linux/module.h> #include <linux/delay.h> #include <linux/init.h> #include <net/irda/irda.h> #include "sir-dev.h" static int girbil_reset(struct sir_dev *dev); static int girbil_open(struct sir_dev *dev); static int girbil_close(struct sir_dev *dev); static int girbil_change_speed(struct sir_dev *dev, unsigned speed); /* Control register 1 */ #define GIRBIL_TXEN 0x01 /* Enable transmitter */ #define GIRBIL_RXEN 0x02 /* Enable receiver */ #define GIRBIL_ECAN 0x04 /* Cancel self emmited data */ #define GIRBIL_ECHO 0x08 /* Echo control characters */ /* LED Current Register (0x2) */ #define GIRBIL_HIGH 0x20 #define GIRBIL_MEDIUM 0x21 #define GIRBIL_LOW 0x22 /* Baud register (0x3) */ #define GIRBIL_2400 0x30 #define GIRBIL_4800 0x31 #define GIRBIL_9600 0x32 #define GIRBIL_19200 0x33 #define GIRBIL_38400 0x34 #define GIRBIL_57600 0x35 #define GIRBIL_115200 0x36 /* Mode register (0x4) */ #define GIRBIL_IRDA 0x40 #define GIRBIL_ASK 0x41 /* Control register 2 (0x5) */ #define GIRBIL_LOAD 0x51 /* Load the new baud rate value */ static struct dongle_driver girbil = { .owner = THIS_MODULE, .driver_name = "Greenwich GIrBIL", .type = IRDA_GIRBIL_DONGLE, .open = girbil_open, .close = girbil_close, .reset = girbil_reset, .set_speed = girbil_change_speed, }; static int __init girbil_sir_init(void) { return irda_register_dongle(&girbil); } static void __exit girbil_sir_cleanup(void) { irda_unregister_dongle(&girbil); } static int girbil_open(struct sir_dev *dev) { struct qos_info *qos = &dev->qos; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* Power on dongle */ sirdev_set_dtr_rts(dev, TRUE, TRUE); qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; qos->min_turn_time.bits = 0x03; irda_qos_bits_to_value(qos); /* irda thread waits 50 msec for power settling */ return 0; } static int girbil_close(struct sir_dev *dev) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* Power off dongle */ sirdev_set_dtr_rts(dev, FALSE, FALSE); return 0; } /* * Function girbil_change_speed (dev, speed) * * Set the speed for the Girbil type dongle. * */ #define GIRBIL_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1) static int girbil_change_speed(struct sir_dev *dev, unsigned speed) { unsigned state = dev->fsm.substate; unsigned delay = 0; u8 control[2]; static int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* dongle alread reset - port and dongle at default speed */ switch(state) { case SIRDEV_STATE_DONGLE_SPEED: /* Set DTR and Clear RTS to enter command mode */ sirdev_set_dtr_rts(dev, FALSE, TRUE); udelay(25); /* better wait a little while */ ret = 0; switch (speed) { default: ret = -EINVAL; /* fall through */ case 9600: control[0] = GIRBIL_9600; break; case 19200: control[0] = GIRBIL_19200; break; case 34800: control[0] = GIRBIL_38400; break; case 57600: control[0] = GIRBIL_57600; break; case 115200: control[0] = GIRBIL_115200; break; } control[1] = GIRBIL_LOAD; /* Write control bytes */ sirdev_raw_write(dev, control, 2); dev->speed = speed; state = GIRBIL_STATE_WAIT_SPEED; delay = 100; break; case GIRBIL_STATE_WAIT_SPEED: /* Go back to normal mode */ sirdev_set_dtr_rts(dev, TRUE, TRUE); udelay(25); /* better wait a little while */ break; default: IRDA_ERROR("%s - undefined state %d\n", __FUNCTION__, state); ret = -EINVAL; break; } dev->fsm.substate = state; return (delay > 0) ? delay : ret; } /* * Function girbil_reset (driver) * * This function resets the girbil dongle. * * Algorithm: * 0. set RTS, and wait at least 5 ms * 1. clear RTS */ #define GIRBIL_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET + 1) #define GIRBIL_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET + 2) #define GIRBIL_STATE_WAIT3_RESET (SIRDEV_STATE_DONGLE_RESET + 3) static int girbil_reset(struct sir_dev *dev) { unsigned state = dev->fsm.substate; unsigned delay = 0; u8 control = GIRBIL_TXEN | GIRBIL_RXEN; int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); switch (state) { case SIRDEV_STATE_DONGLE_RESET: /* Reset dongle */ sirdev_set_dtr_rts(dev, TRUE, FALSE); /* Sleep at least 5 ms */ delay = 20; state = GIRBIL_STATE_WAIT1_RESET; break; case GIRBIL_STATE_WAIT1_RESET: /* Set DTR and clear RTS to enter command mode */ sirdev_set_dtr_rts(dev, FALSE, TRUE); delay = 20; state = GIRBIL_STATE_WAIT2_RESET; break; case GIRBIL_STATE_WAIT2_RESET: /* Write control byte */ sirdev_raw_write(dev, &control, 1); delay = 20; state = GIRBIL_STATE_WAIT3_RESET; break; case GIRBIL_STATE_WAIT3_RESET: /* Go back to normal mode */ sirdev_set_dtr_rts(dev, TRUE, TRUE); dev->speed = 9600; break; default: IRDA_ERROR("%s(), undefined state %d\n", __FUNCTION__, state); ret = -1; break; } dev->fsm.substate = state; return (delay > 0) ? delay : ret; } MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */ module_init(girbil_sir_init); module_exit(girbil_sir_cleanup);