summaryrefslogtreecommitdiffstats
path: root/drivers/net/irda/girbil.c
blob: 248aeb0c726ca8befa21bf1e9c63f21dce0c9ae6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*********************************************************************
 *                
 * 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/tty.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irda_device.h>

static int  girbil_reset(struct irda_task *task);
static void girbil_open(dongle_t *self, struct qos_info *qos);
static void girbil_close(dongle_t *self);
static int  girbil_change_speed(struct irda_task *task);

/* 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_reg dongle = {
	.type = IRDA_GIRBIL_DONGLE,
	.open = girbil_open,
	.close = girbil_close,
	.reset = girbil_reset,
	.change_speed = girbil_change_speed,
	.owner = THIS_MODULE,
};

static int __init girbil_init(void)
{
	return irda_device_register_dongle(&dongle);
}

static void __exit girbil_cleanup(void)
{
	irda_device_unregister_dongle(&dongle);
}

static void girbil_open(dongle_t *self, struct qos_info *qos)
{
	qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
	qos->min_turn_time.bits = 0x03;
}

static void girbil_close(dongle_t *self)
{
	/* Power off dongle */
	self->set_dtr_rts(self->dev, FALSE, FALSE);
}

/*
 * Function girbil_change_speed (dev, speed)
 *
 *    Set the speed for the Girbil type dongle.
 *
 */
static int girbil_change_speed(struct irda_task *task)
{
	dongle_t *self = (dongle_t *) task->instance;
	__u32 speed = (__u32) task->param;
	__u8 control[2];
	int ret = 0;

	self->speed_task = task;

	switch (task->state) {
	case IRDA_TASK_INIT:
		/* Need to reset the dongle and go to 9600 bps before
                   programming */
		if (irda_task_execute(self, girbil_reset, NULL, task, 
				      (void *) speed))
		{
			/* Dongle need more time to reset */
			irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);

			/* Give reset 1 sec to finish */
			ret = msecs_to_jiffies(1000);
		}
		break;
	case IRDA_TASK_CHILD_WAIT:
		IRDA_WARNING("%s(), resetting dongle timed out!\n",
			     __FUNCTION__);
		ret = -1;
		break;
	case IRDA_TASK_CHILD_DONE:
		/* Set DTR and Clear RTS to enter command mode */
		self->set_dtr_rts(self->dev, FALSE, TRUE);

		switch (speed) {
		case 9600:
		default:
			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 */
		self->write(self->dev, control, 2);
		irda_task_next_state(task, IRDA_TASK_WAIT);
		ret = msecs_to_jiffies(100);
		break;
	case IRDA_TASK_WAIT:
		/* Go back to normal mode */
		self->set_dtr_rts(self->dev, TRUE, TRUE);
		irda_task_next_state(task, IRDA_TASK_DONE);
		self->speed_task = NULL;
		break;
	default:
		IRDA_ERROR("%s(), unknown state %d\n",
			   __FUNCTION__, task->state);
		irda_task_next_state(task, IRDA_TASK_DONE);
		self->speed_task = NULL;
		ret = -1;
		break;
	}
	return ret;
}

/*
 * Function girbil_reset (driver)
 *
 *      This function resets the girbil dongle.
 *
 *      Algorithm:
 *    	  0. set RTS, and wait at least 5 ms 
 *        1. clear RTS 
 */
static int girbil_reset(struct irda_task *task)
{
	dongle_t *self = (dongle_t *) task->instance;
	__u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
	int ret = 0;

	self->reset_task = task;

	switch (task->state) {
	case IRDA_TASK_INIT:
		/* Reset dongle */
		self->set_dtr_rts(self->dev, TRUE, FALSE);
		irda_task_next_state(task, IRDA_TASK_WAIT1);
		/* Sleep at least 5 ms */
		ret = msecs_to_jiffies(20);
		break;
	case IRDA_TASK_WAIT1:
		/* Set DTR and clear RTS to enter command mode */
		self->set_dtr_rts(self->dev, FALSE, TRUE);
		irda_task_next_state(task, IRDA_TASK_WAIT2);
		ret = msecs_to_jiffies(20);
		break;
	case IRDA_TASK_WAIT2:
		/* Write control byte */
		self->write(self->dev, &control, 1);
		irda_task_next_state(task, IRDA_TASK_WAIT3);
		ret = msecs_to_jiffies(20);
		break;
	case IRDA_TASK_WAIT3:
		/* 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;
		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>");
MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
	
/*
 * Function init_module (void)
 *
 *    Initialize Girbil module
 *
 */
module_init(girbil_init);

/*
 * Function cleanup_module (void)
 *
 *    Cleanup Girbil module
 *
 */
module_exit(girbil_cleanup);