[deliverable/linux.git] / 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 Tromsø 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 emitted 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,
};

static int __init girbil_sir_init(void)
{
	return irda_register_dongle(&girbil);
}

static void __exit girbil_sir_cleanup(void)
{
	irda_unregister_dongle(&girbil);
}

static int girbil_open(struct sir_dev *dev)
{
	struct qos_info *qos = &dev->qos;

	/* 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)
{
	/* 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;

	/* 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:
		net_err_ratelimited("%s - undefined state %d\n",
				    __func__, 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;

	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:
		net_err_ratelimited("%s(), undefined state %d\n",
				    __func__, 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_sir_init);
module_exit(girbil_sir_cleanup);
Commit	Line	Data
1da177e4 LT	1	/*********************************************************************
	2	*
	3	* Filename: girbil.c
	4	* Version: 1.2
	5	* Description: Implementation for the Greenwich GIrBIL dongle
	6	* Status: Experimental.
	7	* Author: Dag Brattli <dagb@cs.uit.no>
	8	* Created at: Sat Feb 6 21:02:33 1999
	9	* Modified at: Fri Dec 17 09:13:20 1999
	10	* Modified by: Dag Brattli <dagb@cs.uit.no>
	11	*
	12	* Copyright (c) 1999 Dag Brattli, All Rights Reserved.
	13	*
	14	* This program is free software; you can redistribute it and/or
	15	* modify it under the terms of the GNU General Public License as
	16	* published by the Free Software Foundation; either version 2 of
	17	* the License, or (at your option) any later version.
	18	*
96de0e25	19	* Neither Dag Brattli nor University of Tromsø admit liability nor
1da177e4 LT	20	* provide warranty for any of this software. This material is
	21	* provided "AS-IS" and at no charge.
	22	*
	23	********************************************************************/
	24
	25	#include <linux/module.h>
	26	#include <linux/delay.h>
	27	#include <linux/init.h>
	28
	29	#include <net/irda/irda.h>
	30
	31	#include "sir-dev.h"
	32
	33	static int girbil_reset(struct sir_dev *dev);
	34	static int girbil_open(struct sir_dev *dev);
	35	static int girbil_close(struct sir_dev *dev);
	36	static int girbil_change_speed(struct sir_dev *dev, unsigned speed);
	37
	38	/* Control register 1 */
	39	#define GIRBIL_TXEN 0x01 /* Enable transmitter */
	40	#define GIRBIL_RXEN 0x02 /* Enable receiver */
25985edc	41	#define GIRBIL_ECAN 0x04 /* Cancel self emitted data */
1da177e4 LT	42	#define GIRBIL_ECHO 0x08 /* Echo control characters */
	43
	44	/* LED Current Register (0x2) */
	45	#define GIRBIL_HIGH 0x20
	46	#define GIRBIL_MEDIUM 0x21
	47	#define GIRBIL_LOW 0x22
	48
	49	/* Baud register (0x3) */
	50	#define GIRBIL_2400 0x30
	51	#define GIRBIL_4800 0x31
	52	#define GIRBIL_9600 0x32
	53	#define GIRBIL_19200 0x33
	54	#define GIRBIL_38400 0x34
	55	#define GIRBIL_57600 0x35
	56	#define GIRBIL_115200 0x36
	57
	58	/* Mode register (0x4) */
	59	#define GIRBIL_IRDA 0x40
	60	#define GIRBIL_ASK 0x41
	61
	62	/* Control register 2 (0x5) */
	63	#define GIRBIL_LOAD 0x51 /* Load the new baud rate value */
	64
	65	static struct dongle_driver girbil = {
	66	.owner = THIS_MODULE,
	67	.driver_name = "Greenwich GIrBIL",
	68	.type = IRDA_GIRBIL_DONGLE,
	69	.open = girbil_open,
	70	.close = girbil_close,
	71	.reset = girbil_reset,
	72	.set_speed = girbil_change_speed,
	73	};
	74
	75	static int __init girbil_sir_init(void)
	76	{
	77	return irda_register_dongle(&girbil);
	78	}
	79
	80	static void __exit girbil_sir_cleanup(void)
	81	{
	82	irda_unregister_dongle(&girbil);
	83	}
	84
	85	static int girbil_open(struct sir_dev *dev)
	86	{
	87	struct qos_info *qos = &dev->qos;
	88
1da177e4 LT	89	/* Power on dongle */
	90	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	91
	92	qos->baud_rate.bits &= IR_9600\|IR_19200\|IR_38400\|IR_57600\|IR_115200;
	93	qos->min_turn_time.bits = 0x03;
	94	irda_qos_bits_to_value(qos);
	95
	96	/* irda thread waits 50 msec for power settling */
	97
	98	return 0;
	99	}
	100
	101	static int girbil_close(struct sir_dev *dev)
	102	{
1da177e4 LT	103	/* Power off dongle */
	104	sirdev_set_dtr_rts(dev, FALSE, FALSE);
	105
	106	return 0;
	107	}
	108
	109	/*
	110	* Function girbil_change_speed (dev, speed)
	111	*
	112	* Set the speed for the Girbil type dongle.
	113	*
	114	*/
	115
	116	#define GIRBIL_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1)
	117
	118	static int girbil_change_speed(struct sir_dev *dev, unsigned speed)
	119	{
	120	unsigned state = dev->fsm.substate;
	121	unsigned delay = 0;
	122	u8 control[2];
	123	static int ret = 0;
	124
1da177e4 LT	125	/* dongle alread reset - port and dongle at default speed */
	126
	127	switch(state) {
	128
	129	case SIRDEV_STATE_DONGLE_SPEED:
	130
	131	/* Set DTR and Clear RTS to enter command mode */
	132	sirdev_set_dtr_rts(dev, FALSE, TRUE);
	133
	134	udelay(25); /* better wait a little while */
	135
	136	ret = 0;
	137	switch (speed) {
	138	default:
	139	ret = -EINVAL;
	140	/* fall through */
	141	case 9600:
	142	control[0] = GIRBIL_9600;
	143	break;
	144	case 19200:
	145	control[0] = GIRBIL_19200;
	146	break;
	147	case 34800:
	148	control[0] = GIRBIL_38400;
	149	break;
	150	case 57600:
	151	control[0] = GIRBIL_57600;
	152	break;
	153	case 115200:
	154	control[0] = GIRBIL_115200;
	155	break;
	156	}
	157	control[1] = GIRBIL_LOAD;
	158
	159	/* Write control bytes */
	160	sirdev_raw_write(dev, control, 2);
	161
	162	dev->speed = speed;
	163
	164	state = GIRBIL_STATE_WAIT_SPEED;
	165	delay = 100;
	166	break;
	167
	168	case GIRBIL_STATE_WAIT_SPEED:
	169	/* Go back to normal mode */
	170	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	171
	172	udelay(25); /* better wait a little while */
	173	break;
	174
	175	default:
6c91023d JP	176	net_err_ratelimited("%s - undefined state %d\n",
6c91023d JP	177	__func__, state);
1da177e4 LT	178	ret = -EINVAL;
	179	break;
	180	}
	181	dev->fsm.substate = state;
	182	return (delay > 0) ? delay : ret;
	183	}
	184
	185	/*
	186	* Function girbil_reset (driver)
	187	*
	188	* This function resets the girbil dongle.
	189	*
	190	* Algorithm:
	191	* 0. set RTS, and wait at least 5 ms
	192	* 1. clear RTS
	193	*/
	194
	195
	196	#define GIRBIL_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET + 1)
	197	#define GIRBIL_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET + 2)
	198	#define GIRBIL_STATE_WAIT3_RESET (SIRDEV_STATE_DONGLE_RESET + 3)
	199
	200	static int girbil_reset(struct sir_dev *dev)
	201	{
	202	unsigned state = dev->fsm.substate;
	203	unsigned delay = 0;
	204	u8 control = GIRBIL_TXEN \| GIRBIL_RXEN;
	205	int ret = 0;
	206
1da177e4 LT	207	switch (state) {
	208	case SIRDEV_STATE_DONGLE_RESET:
	209	/* Reset dongle */
	210	sirdev_set_dtr_rts(dev, TRUE, FALSE);
	211	/* Sleep at least 5 ms */
	212	delay = 20;
	213	state = GIRBIL_STATE_WAIT1_RESET;
	214	break;
	215
	216	case GIRBIL_STATE_WAIT1_RESET:
	217	/* Set DTR and clear RTS to enter command mode */
	218	sirdev_set_dtr_rts(dev, FALSE, TRUE);
	219	delay = 20;
	220	state = GIRBIL_STATE_WAIT2_RESET;
	221	break;
	222
	223	case GIRBIL_STATE_WAIT2_RESET:
	224	/* Write control byte */
	225	sirdev_raw_write(dev, &control, 1);
	226	delay = 20;
	227	state = GIRBIL_STATE_WAIT3_RESET;
	228	break;
	229
	230	case GIRBIL_STATE_WAIT3_RESET:
	231	/* Go back to normal mode */
	232	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	233	dev->speed = 9600;
	234	break;
	235
	236	default:
6c91023d JP	237	net_err_ratelimited("%s(), undefined state %d\n",
6c91023d JP	238	__func__, state);
1da177e4 LT	239	ret = -1;
	240	break;
	241	}
	242	dev->fsm.substate = state;
	243	return (delay > 0) ? delay : ret;
	244	}
	245
	246	MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
	247	MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
	248	MODULE_LICENSE("GPL");
	249	MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
	250
	251	module_init(girbil_sir_init);
	252	module_exit(girbil_sir_cleanup);