/********************************************************************* * * Filename: litelink.c * Version: 1.1 * Description: Driver for the Parallax LiteLink dongle * Status: Stable * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Fri May 7 12:50:33 1999 * Modified at: Fri Dec 17 09:14:23 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * ********************************************************************/ #include <linux/module.h> #include <linux/delay.h> #include <linux/tty.h> #include <linux/init.h> #include <net/irda/irda.h> #include <net/irda/irda_device.h> #define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */ #define MAX_DELAY 10000 /* 1 ms */ static void litelink_open(dongle_t *self, struct qos_info *qos); static void litelink_close(dongle_t *self); static int litelink_change_speed(struct irda_task *task); static int litelink_reset(struct irda_task *task); /* These are the baudrates supported */ static __u32 baud_rates[] = { 115200, 57600, 38400, 19200, 9600 }; static struct dongle_reg dongle = { .type = IRDA_LITELINK_DONGLE, .open = litelink_open, .close = litelink_close, .reset = litelink_reset, .change_speed = litelink_change_speed, .owner = THIS_MODULE, }; static int __init litelink_init(void) { return irda_device_register_dongle(&dongle); } static void __exit litelink_cleanup(void) { irda_device_unregister_dongle(&dongle); } static void litelink_open(dongle_t *self, struct qos_info *qos) { qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ } static void litelink_close(dongle_t *self) { /* Power off dongle */ self->set_dtr_rts(self->dev, FALSE, FALSE); } /* * Function litelink_change_speed (task) * * Change speed of the Litelink dongle. To cycle through the available * baud rates, pulse RTS low for a few ms. */ static int litelink_change_speed(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u32 speed = (__u32) task->param; int i; /* Clear RTS to reset dongle */ self->set_dtr_rts(self->dev, TRUE, FALSE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Cycle through avaiable baudrates until we reach the correct one */ for (i=0; i<5 && baud_rates[i] != speed; i++) { /* Set DTR, clear RTS */ self->set_dtr_rts(self->dev, FALSE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Set DTR, Set RTS */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); } irda_task_next_state(task, IRDA_TASK_DONE); return 0; } /* * Function litelink_reset (task) * * Reset the Litelink type dongle. * */ static int litelink_reset(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; /* Power on dongle */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Clear RTS to reset dongle */ self->set_dtr_rts(self->dev, TRUE, FALSE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* This dongles speed defaults to 115200 bps */ self->speed = 115200; irda_task_next_state(task, IRDA_TASK_DONE); return 0; } MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); MODULE_DESCRIPTION("Parallax Litelink dongle driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-5"); /* IRDA_LITELINK_DONGLE */ /* * Function init_module (void) * * Initialize Litelink module * */ module_init(litelink_init); /* * Function cleanup_module (void) * * Cleanup Litelink module * */ module_exit(litelink_cleanup);