[IRDA]: Add girbil-sir driver.

From Martin Diehl.

* converted for new api from old driver

drivers/net/irda/girbil-sir.c

+/*********************************************************************
+ *
+ * Filename:      girbil.c
+ * Version:       1.2
+ * Description:   Implementation for the Greenwich GIrBIL dongle
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Sat Feb  6 21:02:33 1999
+ * Modified at:   Fri Dec 17 09:13:20 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.
+ * 
+ *     Neither Dag Brattli nor University of Troms admit liability nor
+ *     provide warranty for any of this software. This material is
+ *     provided "AS-IS" and at no charge.
+ *
+ ********************************************************************/
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#include <net/irda/irda.h>
+
+#include "sir-dev.h"
+
+static int girbil_reset(struct sir_dev *dev);
+static int girbil_open(struct sir_dev *dev);
+static int girbil_close(struct sir_dev *dev);
+static int girbil_change_speed(struct sir_dev *dev, unsigned speed);
+
+/* Control register 1 */
+#define GIRBIL_TXEN    0x01 /* Enable transmitter */
+#define GIRBIL_RXEN    0x02 /* Enable receiver */
+#define GIRBIL_ECAN    0x04 /* Cancel self emmited data */
+#define GIRBIL_ECHO    0x08 /* Echo control characters */
+
+/* LED Current Register (0x2) */
+#define GIRBIL_HIGH    0x20
+#define GIRBIL_MEDIUM  0x21
+#define GIRBIL_LOW     0x22
+
+/* Baud register (0x3) */
+#define GIRBIL_2400    0x30
+#define GIRBIL_4800    0x31
+#define GIRBIL_9600    0x32
+#define GIRBIL_19200   0x33
+#define GIRBIL_38400   0x34
+#define GIRBIL_57600   0x35
+#define GIRBIL_115200  0x36
+
+/* Mode register (0x4) */
+#define GIRBIL_IRDA    0x40
+#define GIRBIL_ASK     0x41
+
+/* Control register 2 (0x5) */
+#define GIRBIL_LOAD    0x51 /* Load the new baud rate value */
+
+static struct dongle_driver girbil = {
+	.owner		= THIS_MODULE,
+	.driver_name	= "Greenwich GIrBIL",
+	.type		= IRDA_GIRBIL_DONGLE,
+	.open		= girbil_open,
+	.close		= girbil_close,
+	.reset		= girbil_reset,
+	.set_speed	= girbil_change_speed,
+};
+
+int __init girbil_init(void)
+{
+	return irda_register_dongle(&girbil);
+}
+
+void __exit girbil_cleanup(void)
+{
+	irda_unregister_dongle(&girbil);
+}
+
+static int girbil_open(struct sir_dev *dev)
+{
+	struct qos_info *qos = &dev->qos;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* Power on dongle */
+	sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+	qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
+	qos->min_turn_time.bits = 0x03;
+	irda_qos_bits_to_value(qos);
+
+	/* irda thread waits 50 msec for power settling */
+
+	return 0;
+}
+
+static int girbil_close(struct sir_dev *dev)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* Power off dongle */
+	sirdev_set_dtr_rts(dev, FALSE, FALSE);
+
+	return 0;
+}
+
+/*
+ * Function girbil_change_speed (dev, speed)
+ *
+ *    Set the speed for the Girbil type dongle.
+ *
+ */
+
+#define GIRBIL_STATE_WAIT_SPEED	(SIRDEV_STATE_DONGLE_SPEED + 1)
+
+static int girbil_change_speed(struct sir_dev *dev, unsigned speed)
+{
+	unsigned state = dev->fsm.substate;
+	unsigned delay = 0;
+	u8 control[2];
+	static int ret = 0;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* dongle alread reset - port and dongle at default speed */
+
+	switch(state) {
+
+	case SIRDEV_STATE_DONGLE_SPEED:
+
+		/* Set DTR and Clear RTS to enter command mode */
+		sirdev_set_dtr_rts(dev, FALSE, TRUE);
+
+		udelay(25);		/* better wait a little while */
+
+		ret = 0;
+		switch (speed) {
+		default:
+			ret = -EINVAL;
+			/* fall through */
+		case 9600:
+			control[0] = GIRBIL_9600;
+			break;
+		case 19200:
+			control[0] = GIRBIL_19200;
+			break;
+		case 34800:
+			control[0] = GIRBIL_38400;
+			break;
+		case 57600:
+			control[0] = GIRBIL_57600;
+			break;
+		case 115200:
+			control[0] = GIRBIL_115200;
+			break;
+		}
+		control[1] = GIRBIL_LOAD;
+	
+		/* Write control bytes */
+		sirdev_raw_write(dev, control, 2);
+
+		dev->speed = speed;
+
+		state = GIRBIL_STATE_WAIT_SPEED;
+		delay = 100;
+		break;
+
+	case GIRBIL_STATE_WAIT_SPEED:
+		/* Go back to normal mode */
+		sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+		udelay(25);		/* better wait a little while */
+		break;
+
+	default:
+		ERROR("%s - undefined state %d\n", __FUNCTION__, state);
+		ret = -EINVAL;
+		break;
+	}
+	dev->fsm.substate = state;
+	return (delay > 0) ? delay : ret;
+}
+
+/*
+ * Function girbil_reset (driver)
+ *
+ *      This function resets the girbil dongle.
+ *
+ *      Algorithm:
+ *    	  0. set RTS, and wait at least 5 ms
+ *        1. clear RTS
+ */
+
+
+#define GIRBIL_STATE_WAIT1_RESET	(SIRDEV_STATE_DONGLE_RESET + 1)
+#define GIRBIL_STATE_WAIT2_RESET	(SIRDEV_STATE_DONGLE_RESET + 2)
+#define GIRBIL_STATE_WAIT3_RESET	(SIRDEV_STATE_DONGLE_RESET + 3)
+
+static int girbil_reset(struct sir_dev *dev)
+{
+	unsigned state = dev->fsm.substate;
+	unsigned delay = 0;
+	u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
+	int ret = 0;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	switch (state) {
+	case SIRDEV_STATE_DONGLE_RESET:
+		/* Reset dongle */
+		sirdev_set_dtr_rts(dev, TRUE, FALSE);
+		/* Sleep at least 5 ms */
+		delay = 20;
+		state = GIRBIL_STATE_WAIT1_RESET;
+		break;
+
+	case GIRBIL_STATE_WAIT1_RESET:
+		/* Set DTR and clear RTS to enter command mode */
+		sirdev_set_dtr_rts(dev, FALSE, TRUE);
+		delay = 20;
+		state = GIRBIL_STATE_WAIT2_RESET;
+		break;
+
+	case GIRBIL_STATE_WAIT2_RESET:
+		/* Write control byte */
+		sirdev_raw_write(dev, &control, 1);
+		delay = 20;
+		state = GIRBIL_STATE_WAIT3_RESET;
+		break;
+
+	case GIRBIL_STATE_WAIT3_RESET:
+		/* Go back to normal mode */
+		sirdev_set_dtr_rts(dev, TRUE, TRUE);
+		dev->speed = 9600;
+		break;
+
+	default:
+		ERROR("%s(), undefined state %d\n", __FUNCTION__, state);
+		ret = -1;
+		break;
+	}
+	dev->fsm.substate = state;
+	return (delay > 0) ? delay : ret;
+}
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
+
+module_init(girbil_init);
+module_exit(girbil_cleanup);