patch-2.2.10 linux/drivers/net/irda/litelink.c

• Lines: 207
• Date: Mon Jun 7 16:19:59 1999
• Orig file: v2.2.9/linux/drivers/net/irda/litelink.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.9/linux/drivers/net/irda/litelink.c linux/drivers/net/irda/litelink.c
@@ -0,0 +1,206 @@
+/*********************************************************************
+ *                
+ * Filename:      litelink.c
+ * Version:       1.0
+ * Description:   Driver for the Parallax LiteLink dongle
+ * Status:        Stable
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Fri May  7 12:50:33 1999
+ * Modified at:   Wed May 19 07:25:15 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * 
+ *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
+ *     
+ *     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.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License 
+ *     along with this program; if not, write to the Free Software 
+ *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
+ *     MA 02111-1307 USA
+ *     
+ ********************************************************************/
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/irda_device.h>
+#include <net/irda/dongle.h>
+
+#define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */
+#define MAX_DELAY 10000   /* 1 ms */
+
+static void litelink_open(struct irda_device *idev, int type);
+static void litelink_close(struct irda_device *dev);
+static void litelink_change_speed(struct irda_device *dev, int baudrate);
+static void litelink_reset(struct irda_device *dev);
+static void litelink_init_qos(struct irda_device *idev, struct qos_info *qos);
+
+/* These are the baudrates supported */
+static int baud_rates[] = { 115200, 57600, 38400, 19200, 9600 };
+
+static struct dongle dongle = {
+	LITELINK_DONGLE,
+	litelink_open,
+	litelink_close,
+	litelink_reset,
+	litelink_change_speed,
+	litelink_init_qos,
+};
+
+__initfunc(int litelink_init(void))
+{
+	return irda_device_register_dongle(&dongle);
+}
+
+void litelink_cleanup(void)
+{
+	irda_device_unregister_dongle(&dongle);
+}
+
+static void litelink_open(struct irda_device *idev, int type)
+{
+	strcat(idev->description, " <-> litelink");
+
+        idev->io.dongle_id = type;
+	idev->flags |= IFF_DONGLE;
+
+	MOD_INC_USE_COUNT;
+}
+
+static void litelink_close(struct irda_device *idev)
+{
+	/* Power off dongle */
+	irda_device_set_dtr_rts(idev, FALSE, FALSE);
+
+	MOD_DEC_USE_COUNT;
+}
+
+/*
+ * Function litelink_change_speed (tty, baud)
+ *
+ *    Change speed of the Litelink dongle. To cycle through the available 
+ *    baud rates, pulse RTS low for a few ms.  
+ */
+static void litelink_change_speed(struct irda_device *idev, int baudrate)
+{
+        int i;
+	
+	ASSERT(idev != NULL, return;);
+	ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
+	
+	/* Clear RTS to reset dongle */
+	irda_device_set_dtr_rts(idev, TRUE, FALSE);
+
+	/* Sleep a minimum of 15 us */
+	udelay(MIN_DELAY);
+
+	/* Go back to normal mode */
+	irda_device_set_dtr_rts(idev, TRUE, TRUE);
+	
+	/* Sleep a minimum of 15 us */
+	udelay(MIN_DELAY);
+	
+	/* Cycle through avaiable baudrates until we reach the correct one */
+	for (i=0; i<5 && baud_rates[i] != baudrate; i++) {
+
+		/* Set DTR, clear RTS */
+		irda_device_set_dtr_rts(idev, FALSE, TRUE);
+		
+		/* Sleep a minimum of 15 us */
+		udelay(MIN_DELAY);
+		
+		/* Set DTR, Set RTS */
+		irda_device_set_dtr_rts(idev, TRUE, TRUE);
+		
+		/* Sleep a minimum of 15 us */
+		udelay(MIN_DELAY);
+        }
+}
+
+/*
+ * Function litelink_reset (dev)
+ *
+ *      Reset the Litelink type dongle. Warning, this function must only be
+ *      called with a process context!
+ *
+ */
+static void litelink_reset(struct irda_device *idev)
+{
+	ASSERT(idev != NULL, return;);
+	ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
+	
+	/* Power on dongle */
+	irda_device_set_dtr_rts(idev, TRUE, TRUE);
+
+	/* Sleep a minimum of 15 us */
+	udelay(MIN_DELAY);
+
+	/* Clear RTS to reset dongle */
+	irda_device_set_dtr_rts(idev, TRUE, FALSE);
+
+	/* Sleep a minimum of 15 us */
+	udelay(MIN_DELAY);
+
+	/* Go back to normal mode */
+	irda_device_set_dtr_rts(idev, TRUE, TRUE);
+	
+	/* Sleep a minimum of 15 us */
+	udelay(MIN_DELAY);
+
+	/* This dongles speed defaults to 115200 bps */
+	idev->qos.baud_rate.value = 115200;
+}
+
+/*
+ * Function litelink_init_qos (qos)
+ *
+ *    Initialize QoS capabilities
+ *
+ */
+static void litelink_init_qos(struct irda_device *idev, struct qos_info *qos)
+{
+	qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
+	qos->min_turn_time.bits &= 0x40; /* Needs 0.01 ms */
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("Parallax Litelink dongle driver");	
+		
+/*
+ * Function init_module (void)
+ *
+ *    Initialize Litelink module
+ *
+ */
+int init_module(void)
+{
+	return litelink_init();
+}
+
+/*
+ * Function cleanup_module (void)
+ *
+ *    Cleanup Litelink module
+ *
+ */
+void cleanup_module(void)
+{
+	litelink_cleanup();
+}
+
+#endif