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Diffstat (limited to 'drivers/net/irda/actisys.c')
| -rw-r--r-- | drivers/net/irda/actisys.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/net/irda/actisys.c b/drivers/net/irda/actisys.c new file mode 100644 index 000000000000..b2e31f4a384c --- /dev/null +++ b/drivers/net/irda/actisys.c @@ -0,0 +1,288 @@ +/********************************************************************* + * + * Filename: actisys.c + * Version: 1.0 + * 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) + * Created at: Wed Oct 21 20:02:35 1998 + * Modified at: Fri Dec 17 09:10:43 1999 + * Modified by: Dag Brattli <dagb@cs.uit.no> + * + * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. + * Copyright (c) 1999 Jean Tourrilhes + * + * 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... + */ + +#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 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_change_speed(struct irda_task *task); +static int actisys_reset(struct irda_task *task); +static void actisys_open(dongle_t *self, struct qos_info *qos); +static void actisys_close(dongle_t *self); + +/* These are the baudrates supported, in the order available */ +/* Note : the 220L doesn't support 38400, but we will fix that below */ +static __u32 baud_rates[] = { 9600, 19200, 57600, 115200, 38400 }; +#define MAX_SPEEDS 5 + +static struct dongle_reg dongle = { + .type = IRDA_ACTISYS_DONGLE, + .open = actisys_open, + .close = actisys_close, + .reset = actisys_reset, + .change_speed = actisys_change_speed, + .owner = THIS_MODULE, +}; + +static struct dongle_reg dongle_plus = { + .type = IRDA_ACTISYS_PLUS_DONGLE, + .open = actisys_open, + .close = actisys_close, + .reset = actisys_reset, + .change_speed = actisys_change_speed, + .owner = THIS_MODULE, +}; + +/* + * Function actisys_change_speed (task) + * + * There is two model of Actisys dongle we are dealing with, + * the 220L and 220L+. At this point, only irattach knows with + * kind the user has requested (it was an argument on irattach + * command line). + * So, we register a dongle of each sort and let irattach + * pick the right one... + */ +static int __init actisys_init(void) +{ + int ret; + + /* First, register an Actisys 220L dongle */ + ret = irda_device_register_dongle(&dongle); + if (ret < 0) + return ret; + /* Now, register an Actisys 220L+ dongle */ + ret = irda_device_register_dongle(&dongle_plus); + if (ret < 0) { + irda_device_unregister_dongle(&dongle); + return ret; + } + return 0; +} + +static void __exit actisys_cleanup(void) +{ + /* We have to remove both dongles */ + irda_device_unregister_dongle(&dongle); + irda_device_unregister_dongle(&dongle_plus); +} + +static void actisys_open(dongle_t *self, struct qos_info *qos) +{ + /* Power on the dongle */ + self->set_dtr_rts(self->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 (self->issue->type == IRDA_ACTISYS_DONGLE) + qos->baud_rate.bits &= ~IR_38400; + + qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ +} + +static void actisys_close(dongle_t *self) +{ + /* Power off the dongle */ + self->set_dtr_rts(self->dev, FALSE, FALSE); +} + +/* + * 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 irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + __u32 speed = (__u32) task->param; /* Target speed */ + int ret = 0; + int i = 0; + + IRDA_DEBUG(4, "%s(), speed=%d (was %d)\n", __FUNCTION__, speed, + self->speed); + + /* Go to a known state by reseting the dongle */ + + /* Reset the dongle : set DTR low for 10 us */ + self->set_dtr_rts(self->dev, FALSE, TRUE); + udelay(MIN_DELAY); + + /* Go back to normal mode (we are now at 9600 b/s) */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* + * 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]) { + self->speed = baud_rates[i]; + break; + } + /* Make sure previous pulse is finished */ + udelay(MIN_DELAY); + + /* Set RTS low for 10 us */ + self->set_dtr_rts(self->dev, TRUE, FALSE); + udelay(MIN_DELAY); + + /* Set RTS high for 10 us */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + } + + /* Check if life is sweet... */ + if (i >= MAX_SPEEDS) + ret = -1; /* This should not happen */ + + /* Basta lavoro, on se casse d'ici... */ + irda_task_next_state(task, IRDA_TASK_DONE); + + 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... + * 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 irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + int ret = 0; + + IRDA_ASSERT(task != NULL, return -1;); + + self->reset_task = task; + + switch (task->state) { + case IRDA_TASK_INIT: + /* Set both DTR & RTS to power up the dongle */ + /* In theory redundant with power up in actisys_open() */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* Sleep 50 ms to make sure capacitor is charged */ + ret = msecs_to_jiffies(50); + irda_task_next_state(task, IRDA_TASK_WAIT); + break; + case IRDA_TASK_WAIT: + /* Reset the dongle : set DTR low for 10 us */ + self->set_dtr_rts(self->dev, FALSE, TRUE); + udelay(MIN_DELAY); + + /* Go back to normal mode */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + irda_task_next_state(task, IRDA_TASK_DONE); + self->reset_task = NULL; + self->speed = 9600; /* That's the default */ + 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; + break; + } + return ret; +} + +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 */ + + +/* + * Function init_module (void) + * + * Initialize Actisys module + * + */ +module_init(actisys_init); + +/* + * Function cleanup_module (void) + * + * Cleanup Actisys module + * + */ +module_exit(actisys_cleanup); |