[IRDA]: Add ma600-sir driver.

From Martin Diehl.

* converted for new api from old driver

drivers/net/irda/ma600-sir.c

+/*********************************************************************
+ *                
+ * Filename:      ma600.c
+ * Version:       0.1
+ * Description:   Implementation of the MA600 dongle
+ * Status:        Experimental.
+ * Author:        Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
+ * Created at:    Sat Jun 10 20:02:35 2000
+ * Modified at:   Sat Aug 16 09:34:13 2003
+ * Modified by:   Martin Diehl <mad@mdiehl.de> (modified for new sir_dev)
+ *
+ * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing 
+ *       information on the MA600 dongle
+ * 
+ *     Copyright (c) 2000 Leung, 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/init.h>
+#include <linux/sched.h>
+
+#include <net/irda/irda.h>
+
+#include "sir-dev.h"
+
+static int ma600_open(struct sir_dev *);
+static int ma600_close(struct sir_dev *);
+static int ma600_change_speed(struct sir_dev *, unsigned);
+static int ma600_reset(struct sir_dev *);
+
+/* control byte for MA600 */
+#define MA600_9600	0x00
+#define MA600_19200	0x01
+#define MA600_38400	0x02
+#define MA600_57600	0x03
+#define MA600_115200	0x04
+#define MA600_DEV_ID1	0x05
+#define MA600_DEV_ID2	0x06
+#define MA600_2400	0x08
+
+static struct dongle_driver ma600 = {
+	.owner          = THIS_MODULE,
+	.driver_name    = "MA600",
+	.type           = IRDA_MA600_DONGLE,
+	.open           = ma600_open,
+	.close          = ma600_close,
+	.reset          = ma600_reset,
+	.set_speed      = ma600_change_speed,
+};
+
+
+int __init ma600_sir_init(void)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+	return irda_register_dongle(&ma600);
+}
+
+void __exit ma600_sir_cleanup(void)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+	irda_unregister_dongle(&ma600);
+}
+
+/*
+	Power on:
+		(0) Clear RTS and DTR for 1 second
+		(1) Set RTS and DTR for 1 second
+		(2) 9600 bps now
+	Note: assume RTS, DTR are clear before
+*/
+static int ma600_open(struct sir_dev *dev)
+{
+	struct qos_info *qos = &dev->qos;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+	/* Explicitly set the speeds we can accept */
+	qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
+				|IR_57600|IR_115200;
+	/* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
+	qos->min_turn_time.bits = 0x01;		/* Needs at least 1 ms */	
+	irda_qos_bits_to_value(qos);
+
+	/* irda thread waits 50 msec for power settling */
+
+	return 0;
+}
+
+static int ma600_close(struct sir_dev *dev)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* Power off dongle */
+	sirdev_set_dtr_rts(dev, FALSE, FALSE);
+
+	return 0;
+}
+
+static __u8 get_control_byte(__u32 speed)
+{
+	__u8 byte;
+
+	switch (speed) {
+	default:
+	case 115200:
+		byte = MA600_115200;
+		break;
+	case 57600:
+		byte = MA600_57600;
+		break;
+	case 38400:
+		byte = MA600_38400;
+		break;
+	case 19200:
+		byte = MA600_19200;
+		break;
+	case 9600:
+		byte = MA600_9600;
+		break;
+	case 2400:
+		byte = MA600_2400;
+		break;
+	}
+
+	return byte;
+}
+
+/*
+ * Function ma600_change_speed (dev, speed)
+ *
+ *    Set the speed for the MA600 type dongle.
+ *
+ *    The dongle has already been reset to a known state (dongle default)
+ *    We cycle through speeds by pulsing RTS low and then high.
+ */
+
+/*
+ * Function ma600_change_speed (dev, speed)
+ *
+ *    Set the speed for the MA600 type dongle.
+ *
+ *    Algorithm
+ *    1. Reset (already done by irda thread state machine)
+ *    2. clear RTS, set DTR and wait for 1ms
+ *    3. send Control Byte to the MA600 through TXD to set new baud rate
+ *       wait until the stop bit of Control Byte is sent (for 9600 baud rate, 
+ *       it takes about 10 msec)
+ *    4. set RTS, set DTR (return to NORMAL Operation)
+ *    5. wait at least 10 ms, new setting (baud rate, etc) takes effect here 
+ *       after
+ */
+
+/* total delays are only about 20ms - let's just sleep for now to
+ * avoid the state machine complexity before we get things working
+ */
+
+static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
+{
+	u8	byte;
+	
+	IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __FUNCTION__,
+		speed, dev->speed);
+
+	/* dongle already reset, dongle and port at default speed (9600) */
+
+	/* Set RTS low for 1 ms */
+	sirdev_set_dtr_rts(dev, TRUE, FALSE);
+	mdelay(1);
+
+	/* Write control byte */
+	byte = get_control_byte(speed);
+	sirdev_raw_write(dev, &byte, sizeof(byte));
+
+	/* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(MSECS_TO_JIFFIES(15));		/* old ma600 uses 15ms */
+
+#if 1
+	/* read-back of the control byte. ma600 is the first dongle driver
+	 * which uses this so there might be some unidentified issues.
+	 * Disable this in case of problems with readback.
+	 */
+
+	sirdev_raw_read(dev, &byte, sizeof(byte));
+	if (byte != get_control_byte(speed))  {
+		WARNING("%s(): bad control byte read-back %02x != %02x\n",
+			__FUNCTION__, (unsigned) byte,
+			(unsigned) get_control_byte(speed));
+		return -1;
+	}
+	else
+		IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__);
+#endif
+
+	/* Set DTR, Set RTS */
+	sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+	/* Wait at least 10ms */
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(MSECS_TO_JIFFIES(10));
+
+	/* dongle is now switched to the new speed */
+	dev->speed = speed;
+
+	return 0;
+}
+
+/*
+ * Function ma600_reset (dev)
+ *
+ *      This function resets the ma600 dongle.
+ *
+ *      Algorithm:
+ *    	  0. DTR=0, RTS=1 and wait 10 ms
+ *    	  1. DTR=1, RTS=1 and wait 10 ms
+ *        2. 9600 bps now
+ */
+
+/* total delays are only about 20ms - let's just sleep for now to
+ * avoid the state machine complexity before we get things working
+ */
+
+int ma600_reset(struct sir_dev *dev)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* Reset the dongle : set DTR low for 10 ms */
+	sirdev_set_dtr_rts(dev, FALSE, TRUE);
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(MSECS_TO_JIFFIES(10));
+
+	/* Go back to normal mode */
+	sirdev_set_dtr_rts(dev, TRUE, TRUE);
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(MSECS_TO_JIFFIES(10));
+
+	dev->speed = 9600;      /* That's the dongle-default */
+
+	return 0;
+}
+
+MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
+MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
+		
+module_init(ma600_sir_init);
+module_exit(ma600_sir_cleanup);
+