/********************************************************************* * * Filename: tekram.c * Version: 1.2 * Description: Implementation of the Tekram IrMate IR-210B dongle * Status: Experimental. * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Wed Oct 21 20:02:35 1998 * Modified at: Fri Dec 17 09:13:09 1999 * Modified by: Dag Brattli <dagb@cs.uit.no> * * Copyright (c) 1998-1999 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 Troms� 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/tty.h> #include <linux/init.h> #include <net/irda/irda.h> #include <net/irda/irda_device.h> static void tekram_open(dongle_t *self, struct qos_info *qos); static void tekram_close(dongle_t *self); static int tekram_change_speed(struct irda_task *task); static int tekram_reset(struct irda_task *task); #define TEKRAM_115200 0x00 #define TEKRAM_57600 0x01 #define TEKRAM_38400 0x02 #define TEKRAM_19200 0x03 #define TEKRAM_9600 0x04 #define TEKRAM_PW 0x10 /* Pulse select bit */ static struct dongle_reg dongle = { .type = IRDA_TEKRAM_DONGLE, .open = tekram_open, .close = tekram_close, .reset = tekram_reset, .change_speed = tekram_change_speed, .owner = THIS_MODULE, }; static int __init tekram_init(void) { return irda_device_register_dongle(&dongle); } static void __exit tekram_cleanup(void) { irda_device_unregister_dongle(&dongle); } static void tekram_open(dongle_t *self, struct qos_info *qos) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */ irda_qos_bits_to_value(qos); } static void tekram_close(dongle_t *self) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); /* Power off dongle */ self->set_dtr_rts(self->dev, FALSE, FALSE); if (self->reset_task) irda_task_delete(self->reset_task); if (self->speed_task) irda_task_delete(self->speed_task); } /* * Function tekram_change_speed (dev, state, speed) * * Set the speed for the Tekram IRMate 210 type dongle. Warning, this * function must be called with a process context! * * Algorithm * 1. clear DTR * 2. set RTS, and wait at least 7 us * 3. send Control Byte to the IR-210 through TXD to set new baud rate * wait until the stop bit of Control Byte is sent (for 9600 baud rate, * it takes about 100 msec) * 5. clear RTS (return to NORMAL Operation) * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here * after */ static int tekram_change_speed(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u32 speed = (__u32) task->param; __u8 byte; int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); IRDA_ASSERT(task != NULL, return -1;); if (self->speed_task && self->speed_task != task) { IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ ); return msecs_to_jiffies(10); } else self->speed_task = task; switch (speed) { default: case 9600: byte = TEKRAM_PW|TEKRAM_9600; break; case 19200: byte = TEKRAM_PW|TEKRAM_19200; break; case 38400: byte = TEKRAM_PW|TEKRAM_38400; break; case 57600: byte = TEKRAM_PW|TEKRAM_57600; break; case 115200: byte = TEKRAM_115200; break; } switch (task->state) { case IRDA_TASK_INIT: case IRDA_TASK_CHILD_INIT: /* * Need to reset the dongle and go to 9600 bps before * programming */ if (irda_task_execute(self, tekram_reset, NULL, task, (void *) speed)) { /* Dongle need more time to reset */ irda_task_next_state(task, IRDA_TASK_CHILD_WAIT); /* Give reset 1 sec to finish */ ret = msecs_to_jiffies(1000); } else irda_task_next_state(task, IRDA_TASK_CHILD_DONE); break; case IRDA_TASK_CHILD_WAIT: IRDA_WARNING("%s(), resetting dongle timed out!\n", __FUNCTION__); ret = -1; break; case IRDA_TASK_CHILD_DONE: /* Set DTR, Clear RTS */ self->set_dtr_rts(self->dev, TRUE, FALSE); /* Wait at least 7us */ udelay(14); /* Write control byte */ self->write(self->dev, &byte, 1); irda_task_next_state(task, IRDA_TASK_WAIT); /* Wait at least 100 ms */ ret = msecs_to_jiffies(150); break; case IRDA_TASK_WAIT: /* Set DTR, Set RTS */ self->set_dtr_rts(self->dev, TRUE, TRUE); irda_task_next_state(task, IRDA_TASK_DONE); self->speed_task = NULL; break; default: IRDA_ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state); irda_task_next_state(task, IRDA_TASK_DONE); self->speed_task = NULL; ret = -1; break; } return ret; } /* * Function tekram_reset (driver) * * This function resets the tekram dongle. Warning, this function * must be called with a process context!! * * Algorithm: * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) * 1. clear RTS * 2. set DTR, and wait at least 1 ms * 3. clear DTR to SPACE state, wait at least 50 us for further * operation */ int tekram_reset(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); IRDA_ASSERT(task != NULL, return -1;); if (self->reset_task && self->reset_task != task) { IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ ); return msecs_to_jiffies(10); } else self->reset_task = task; /* Power off dongle */ //self->set_dtr_rts(self->dev, FALSE, FALSE); self->set_dtr_rts(self->dev, TRUE, TRUE); switch (task->state) { case IRDA_TASK_INIT: irda_task_next_state(task, IRDA_TASK_WAIT1); /* Sleep 50 ms */ ret = msecs_to_jiffies(50); break; case IRDA_TASK_WAIT1: /* Clear DTR, Set RTS */ self->set_dtr_rts(self->dev, FALSE, TRUE); irda_task_next_state(task, IRDA_TASK_WAIT2); /* Should sleep 1 ms */ ret = msecs_to_jiffies(1); break; case IRDA_TASK_WAIT2: /* Set DTR, Set RTS */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Wait at least 50 us */ udelay(75); irda_task_next_state(task, IRDA_TASK_DONE); self->reset_task = NULL; break; default: IRDA_ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state); irda_task_next_state(task, IRDA_TASK_DONE); self->reset_task = NULL; ret = -1; } return ret; } MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ /* * Function init_module (void) * * Initialize Tekram module * */ module_init(tekram_init); /* * Function cleanup_module (void) * * Cleanup Tekram module * */ module_exit(tekram_cleanup);