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);