/********************************************************************* * * Filename: actisys.c * Version: 1.1 * Description: Implementation for the ACTiSYS IR-220L and IR-220L+ * dongles * Status: Beta. * Authors: Dag Brattli <dagb@cs.uit.no> (initially) * Jean Tourrilhes <jt@hpl.hp.com> (new version) * Martin Diehl <mad@mdiehl.de> (new version for sir_dev) * Created at: Wed Oct 21 20:02:35 1998 * Modified at: Sun Oct 27 22:02:13 2002 * Modified by: Martin Diehl <mad@mdiehl.de> * * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. * Copyright (c) 1999 Jean Tourrilhes * Copyright (c) 2002 Martin Diehl * * 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. * ********************************************************************/ /* * Changelog * * 0.8 -> 0.9999 - Jean * o New initialisation procedure : much safer and correct * o New procedure the change speed : much faster and simpler * o Other cleanups & comments * Thanks to Lichen Wang @ Actisys for his excellent help... * * 1.0 -> 1.1 - Martin Diehl * modified for new sir infrastructure */ #include <linux/module.h> #include <linux/delay.h> #include <linux/init.h> #include <net/irda/irda.h> #include "sir-dev.h" /* * Define the timing of the pulses we send to the dongle (to reset it, and * to toggle speeds). Basically, the limit here is the propagation speed of * the signals through the serial port, the dongle being much faster. Any * serial port support 115 kb/s, so we are sure that pulses 8.5 us wide can * go through cleanly . If you are on the wild side, you can try to lower * this value (Actisys recommended me 2 us, and 0 us work for me on a P233!) */ #define MIN_DELAY 10 /* 10 us to be on the conservative side */ static int actisys_open(struct sir_dev *); static int actisys_close(struct sir_dev *); static int actisys_change_speed(struct sir_dev *, unsigned); static int actisys_reset(struct sir_dev *); /* These are the baudrates supported, in the order available */ /* Note : the 220L doesn't support 38400, but we will fix that below */ static unsigned baud_rates[] = { 9600, 19200, 57600, 115200, 38400 }; #define MAX_SPEEDS ARRAY_SIZE(baud_rates) static struct dongle_driver act220l = { .owner = THIS_MODULE, .driver_name = "Actisys ACT-220L", .type = IRDA_ACTISYS_DONGLE, .open = actisys_open, .close = actisys_close, .reset = actisys_reset, .set_speed = actisys_change_speed, }; static struct dongle_driver act220l_plus = { .owner = THIS_MODULE, .driver_name = "Actisys ACT-220L+", .type = IRDA_ACTISYS_PLUS_DONGLE, .open = actisys_open, .close = actisys_close, .reset = actisys_reset, .set_speed = actisys_change_speed, }; static int __init actisys_sir_init(void) { int ret; /* First, register an Actisys 220L dongle */ ret = irda_register_dongle(&act220l); if (ret < 0) return ret; /* Now, register an Actisys 220L+ dongle */ ret = irda_register_dongle(&act220l_plus); if (ret < 0) { irda_unregister_dongle(&act220l); return ret; } return 0; } static void __exit actisys_sir_cleanup(void) { /* We have to remove both dongles */ irda_unregister_dongle(&act220l_plus); irda_unregister_dongle(&act220l); } static int actisys_open(struct sir_dev *dev) { struct qos_info *qos = &dev->qos; sirdev_set_dtr_rts(dev, TRUE, TRUE); /* Set the speeds we can accept */ qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; /* Remove support for 38400 if this is not a 220L+ dongle */ if (dev->dongle_drv->type == IRDA_ACTISYS_DONGLE) qos->baud_rate.bits &= ~IR_38400; qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ irda_qos_bits_to_value(qos); /* irda thread waits 50 msec for power settling */ return 0; } static int actisys_close(struct sir_dev *dev) { /* Power off the dongle */ sirdev_set_dtr_rts(dev, FALSE, FALSE); return 0; } /* * Function actisys_change_speed (task) * * Change speed of the ACTiSYS IR-220L and IR-220L+ type IrDA dongles. * To cycle through the available baud rates, pulse RTS low for a few us. * * First, we reset the dongle to always start from a known state. * Then, we cycle through the speeds by pulsing RTS low and then up. * The dongle allow us to pulse quite fast, se we can set speed in one go, * which is must faster ( < 100 us) and less complex than what is found * in some other dongle drivers... * Note that even if the new speed is the same as the current speed, * we reassert the speed. This make sure that things are all right, * and it's fast anyway... * By the way, this function will work for both type of dongles, * because the additional speed is at the end of the sequence... */ static int actisys_change_speed(struct sir_dev *dev, unsigned speed) { int ret = 0; int i = 0; IRDA_DEBUG(4, "%s(), speed=%d (was %d)\n", __FUNCTION__, speed, dev->speed); /* dongle was already resetted from irda_request state machine, * we are in known state (dongle default) */ /* * Now, we can set the speed requested. Send RTS pulses until we * reach the target speed */ for (i = 0; i < MAX_SPEEDS; i++) { if (speed == baud_rates[i]) { dev->speed = speed; break; } /* Set RTS low for 10 us */ sirdev_set_dtr_rts(dev, TRUE, FALSE); udelay(MIN_DELAY); /* Set RTS high for 10 us */ sirdev_set_dtr_rts(dev, TRUE, TRUE); udelay(MIN_DELAY); } /* Check if life is sweet... */ if (i >= MAX_SPEEDS) { actisys_reset(dev); ret = -EINVAL; /* This should not happen */ } /* Basta lavoro, on se casse d'ici... */ return ret; } /* * Function actisys_reset (task) * * Reset the Actisys type dongle. Warning, this function must only be * called with a process context! * * We need to do two things in this function : * o first make sure that the dongle is in a state where it can operate * o second put the dongle in a know state * * The dongle is powered of the RTS and DTR lines. In the dongle, there * is a big capacitor to accommodate the current spikes. This capacitor * takes a least 50 ms to be charged. In theory, the Bios set those lines * up, so by the time we arrive here we should be set. It doesn't hurt * to be on the conservative side, so we will wait... * <Martin : move above comment to irda_config_fsm> * Then, we set the speed to 9600 b/s to get in a known state (see in * change_speed for details). It is needed because the IrDA stack * has tried to set the speed immediately after our first return, * so before we can be sure the dongle is up and running. */ static int actisys_reset(struct sir_dev *dev) { /* Reset the dongle : set DTR low for 10 us */ sirdev_set_dtr_rts(dev, FALSE, TRUE); udelay(MIN_DELAY); /* Go back to normal mode */ sirdev_set_dtr_rts(dev, TRUE, TRUE); dev->speed = 9600; /* That's the default */ return 0; } MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no> - Jean Tourrilhes <jt@hpl.hp.com>"); MODULE_DESCRIPTION("ACTiSYS IR-220L and IR-220L+ dongle driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-2"); /* IRDA_ACTISYS_DONGLE */ MODULE_ALIAS("irda-dongle-3"); /* IRDA_ACTISYS_PLUS_DONGLE */ module_init(actisys_sir_init); module_exit(actisys_sir_cleanup);