cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/irda/actisys-sir.c

Directory: drivers/net/irda
/*********************************************************************
 *                
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes5898.31%150.00%
David S. Miller11.69%150.00%
Total59100.00%2100.00%


static void __exit actisys_sir_cleanup(void) { /* We have to remove both dongles */ irda_unregister_dongle(&act220l_plus); irda_unregister_dongle(&act220l); }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes2195.45%150.00%
David S. Miller14.55%150.00%
Total22100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes85100.00%2100.00%
Total85100.00%2100.00%


static int actisys_close(struct sir_dev *dev) { /* Power off the dongle */ sirdev_set_dtr_rts(dev, FALSE, FALSE); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes24100.00%2100.00%
Total24100.00%2100.00%

/* * 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; pr_debug("%s(), speed=%d (was %d)\n", __func__, 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes12498.41%250.00%
Joe Perches10.79%125.00%
Harvey Harrison10.79%125.00%
Total126100.00%4100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes46100.00%2100.00%
Total46100.00%2100.00%

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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes56298.77%333.33%
David S. Miller20.35%111.11%
Joe Perches10.18%111.11%
Cheng Renquan10.18%111.11%
Harvey Harrison10.18%111.11%
Jan Engelhardt10.18%111.11%
Michael Hayes10.18%111.11%
Total569100.00%9100.00%
Directory: drivers/net/irda
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.