diff options
Diffstat (limited to 'drivers/net/irda/actisys-sir.c')
| -rw-r--r-- | drivers/net/irda/actisys-sir.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/net/irda/actisys-sir.c b/drivers/net/irda/actisys-sir.c new file mode 100644 index 000000000000..9715ab5572e9 --- /dev/null +++ b/drivers/net/irda/actisys-sir.c @@ -0,0 +1,246 @@ +/********************************************************************* + * + * 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 Tromsų 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 (sizeof(baud_rates)/sizeof(baud_rates[0])) + +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); |