summaryrefslogtreecommitdiff
path: root/drivers/input/joystick/spaceball.c
blob: a85a4f33aea8ca11eb294a117ed79f335a5c145c (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
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	David Thompson
 *	Joseph Krahn
 */

/*
 * SpaceTec SpaceBall 2003/3003/4000 FLX driver for Linux
 */

/*
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <asm/unaligned.h>

#define DRIVER_DESC	"SpaceTec SpaceBall 2003/3003/4000 FLX driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Constants.
 */

#define SPACEBALL_MAX_LENGTH	128
#define SPACEBALL_MAX_ID	9

#define SPACEBALL_1003      1
#define SPACEBALL_2003B     3
#define SPACEBALL_2003C     4
#define SPACEBALL_3003C     7
#define SPACEBALL_4000FLX   8
#define SPACEBALL_4000FLX_L 9

static int spaceball_axes[] = { ABS_X, ABS_Z, ABS_Y, ABS_RX, ABS_RZ, ABS_RY };
static char *spaceball_names[] = {
	"?", "SpaceTec SpaceBall 1003", "SpaceTec SpaceBall 2003", "SpaceTec SpaceBall 2003B",
	"SpaceTec SpaceBall 2003C", "SpaceTec SpaceBall 3003", "SpaceTec SpaceBall SpaceController",
	"SpaceTec SpaceBall 3003C", "SpaceTec SpaceBall 4000FLX", "SpaceTec SpaceBall 4000FLX Lefty" };

/*
 * Per-Ball data.
 */

struct spaceball {
	struct input_dev *dev;
	int idx;
	int escape;
	unsigned char data[SPACEBALL_MAX_LENGTH];
	char phys[32];
};

/*
 * spaceball_process_packet() decodes packets the driver receives from the
 * SpaceBall.
 */

static void spaceball_process_packet(struct spaceball* spaceball)
{
	struct input_dev *dev = spaceball->dev;
	unsigned char *data = spaceball->data;
	int i;

	if (spaceball->idx < 2) return;

	switch (spaceball->data[0]) {

		case 'D':					/* Ball data */
			if (spaceball->idx != 15) return;
			/*
			 * Skip first three bytes; read six axes worth of data.
			 * Axis values are signed 16-bit big-endian.
			 */
			data += 3;
			for (i = 0; i < ARRAY_SIZE(spaceball_axes); i++) {
				input_report_abs(dev, spaceball_axes[i],
					(__s16)get_unaligned_be16(&data[i * 2]));
			}
			break;

		case 'K':					/* Button data */
			if (spaceball->idx != 3) return;
			input_report_key(dev, BTN_1, (data[2] & 0x01) || (data[2] & 0x20));
			input_report_key(dev, BTN_2, data[2] & 0x02);
			input_report_key(dev, BTN_3, data[2] & 0x04);
			input_report_key(dev, BTN_4, data[2] & 0x08);
			input_report_key(dev, BTN_5, data[1] & 0x01);
			input_report_key(dev, BTN_6, data[1] & 0x02);
			input_report_key(dev, BTN_7, data[1] & 0x04);
			input_report_key(dev, BTN_8, data[1] & 0x10);
			break;

		case '.':					/* Advanced button data */
			if (spaceball->idx != 3) return;
			input_report_key(dev, BTN_1, data[2] & 0x01);
			input_report_key(dev, BTN_2, data[2] & 0x02);
			input_report_key(dev, BTN_3, data[2] & 0x04);
			input_report_key(dev, BTN_4, data[2] & 0x08);
			input_report_key(dev, BTN_5, data[2] & 0x10);
			input_report_key(dev, BTN_6, data[2] & 0x20);
			input_report_key(dev, BTN_7, data[2] & 0x80);
			input_report_key(dev, BTN_8, data[1] & 0x01);
			input_report_key(dev, BTN_9, data[1] & 0x02);
			input_report_key(dev, BTN_A, data[1] & 0x04);
			input_report_key(dev, BTN_B, data[1] & 0x08);
			input_report_key(dev, BTN_C, data[1] & 0x10);
			input_report_key(dev, BTN_MODE, data[1] & 0x20);
			break;

		case 'E':					/* Device error */
			spaceball->data[spaceball->idx - 1] = 0;
			printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1);
			break;

		case '?':					/* Bad command packet */
			spaceball->data[spaceball->idx - 1] = 0;
			printk(KERN_ERR "spaceball: Bad command. [%s]\n", spaceball->data + 1);
			break;
	}

	input_sync(dev);
}

/*
 * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor,
 * and end in 0x0d. It uses '^' as an escape for CR, XOFF and XON characters which
 * can occur in the axis values.
 */

static irqreturn_t spaceball_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags)
{
	struct spaceball *spaceball = serio_get_drvdata(serio);

	switch (data) {
		case 0xd:
			spaceball_process_packet(spaceball);
			spaceball->idx = 0;
			spaceball->escape = 0;
			break;
		case '^':
			if (!spaceball->escape) {
				spaceball->escape = 1;
				break;
			}
			spaceball->escape = 0;
			fallthrough;
		case 'M':
		case 'Q':
		case 'S':
			if (spaceball->escape) {
				spaceball->escape = 0;
				data &= 0x1f;
			}
			fallthrough;
		default:
			if (spaceball->escape)
				spaceball->escape = 0;
			if (spaceball->idx < SPACEBALL_MAX_LENGTH)
				spaceball->data[spaceball->idx++] = data;
			break;
	}
	return IRQ_HANDLED;
}

/*
 * spaceball_disconnect() is the opposite of spaceball_connect()
 */

static void spaceball_disconnect(struct serio *serio)
{
	struct spaceball* spaceball = serio_get_drvdata(serio);

	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_unregister_device(spaceball->dev);
	kfree(spaceball);
}

/*
 * spaceball_connect() is the routine that is called when someone adds a
 * new serio device that supports Spaceball protocol and registers it as
 * an input device.
 */

static int spaceball_connect(struct serio *serio, struct serio_driver *drv)
{
	struct spaceball *spaceball;
	struct input_dev *input_dev;
	int err = -ENOMEM;
	int i, id;

	if ((id = serio->id.id) > SPACEBALL_MAX_ID)
		return -ENODEV;

	spaceball = kmalloc(sizeof(struct spaceball), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!spaceball || !input_dev)
		goto fail1;

	spaceball->dev = input_dev;
	snprintf(spaceball->phys, sizeof(spaceball->phys), "%s/input0", serio->phys);

	input_dev->name = spaceball_names[id];
	input_dev->phys = spaceball->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_SPACEBALL;
	input_dev->id.product = id;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &serio->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	switch (id) {
		case SPACEBALL_4000FLX:
		case SPACEBALL_4000FLX_L:
			input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_9);
			input_dev->keybit[BIT_WORD(BTN_A)] |= BIT_MASK(BTN_A) |
				BIT_MASK(BTN_B) | BIT_MASK(BTN_C) |
				BIT_MASK(BTN_MODE);
			fallthrough;
		default:
			input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_2) |
				BIT_MASK(BTN_3) | BIT_MASK(BTN_4) |
				BIT_MASK(BTN_5) | BIT_MASK(BTN_6) |
				BIT_MASK(BTN_7) | BIT_MASK(BTN_8);
			fallthrough;
		case SPACEBALL_3003C:
			input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1) |
				BIT_MASK(BTN_8);
	}

	for (i = 0; i < 3; i++) {
		input_set_abs_params(input_dev, ABS_X + i, -8000, 8000, 8, 40);
		input_set_abs_params(input_dev, ABS_RX + i, -1600, 1600, 2, 8);
	}

	serio_set_drvdata(serio, spaceball);

	err = serio_open(serio, drv);
	if (err)
		goto fail2;

	err = input_register_device(spaceball->dev);
	if (err)
		goto fail3;

	return 0;

 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
	kfree(spaceball);
	return err;
}

/*
 * The serio driver structure.
 */

static const struct serio_device_id spaceball_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_SPACEBALL,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, spaceball_serio_ids);

static struct serio_driver spaceball_drv = {
	.driver		= {
		.name	= "spaceball",
	},
	.description	= DRIVER_DESC,
	.id_table	= spaceball_serio_ids,
	.interrupt	= spaceball_interrupt,
	.connect	= spaceball_connect,
	.disconnect	= spaceball_disconnect,
};

module_serio_driver(spaceball_drv);