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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 1999-2001 Vojtech Pavlik
4 *
5 * Based on the work of:
6 * David Thompson
7 * Joseph Krahn
8 */
9
10/*
11 * SpaceTec SpaceBall 2003/3003/4000 FLX driver for Linux
12 */
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/input.h>
18#include <linux/serio.h>
19#include <linux/unaligned.h>
20
21#define DRIVER_DESC "SpaceTec SpaceBall 2003/3003/4000 FLX driver"
22
23MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
24MODULE_DESCRIPTION(DRIVER_DESC);
25MODULE_LICENSE("GPL");
26
27/*
28 * Constants.
29 */
30
31#define SPACEBALL_MAX_LENGTH 128
32#define SPACEBALL_MAX_ID 9
33
34#define SPACEBALL_1003 1
35#define SPACEBALL_2003B 3
36#define SPACEBALL_2003C 4
37#define SPACEBALL_3003C 7
38#define SPACEBALL_4000FLX 8
39#define SPACEBALL_4000FLX_L 9
40
41static int spaceball_axes[] = { ABS_X, ABS_Z, ABS_Y, ABS_RX, ABS_RZ, ABS_RY };
42static char *spaceball_names[] = {
43 "?", "SpaceTec SpaceBall 1003", "SpaceTec SpaceBall 2003", "SpaceTec SpaceBall 2003B",
44 "SpaceTec SpaceBall 2003C", "SpaceTec SpaceBall 3003", "SpaceTec SpaceBall SpaceController",
45 "SpaceTec SpaceBall 3003C", "SpaceTec SpaceBall 4000FLX", "SpaceTec SpaceBall 4000FLX Lefty" };
46
47/*
48 * Per-Ball data.
49 */
50
51struct spaceball {
52 struct input_dev *dev;
53 int idx;
54 int escape;
55 unsigned char data[SPACEBALL_MAX_LENGTH];
56 char phys[32];
57};
58
59/*
60 * spaceball_process_packet() decodes packets the driver receives from the
61 * SpaceBall.
62 */
63
64static void spaceball_process_packet(struct spaceball* spaceball)
65{
66 struct input_dev *dev = spaceball->dev;
67 unsigned char *data = spaceball->data;
68 int i;
69
70 if (spaceball->idx < 2) return;
71
72 switch (spaceball->data[0]) {
73
74 case 'D': /* Ball data */
75 if (spaceball->idx != 15) return;
76 /*
77 * Skip first three bytes; read six axes worth of data.
78 * Axis values are signed 16-bit big-endian.
79 */
80 data += 3;
81 for (i = 0; i < ARRAY_SIZE(spaceball_axes); i++) {
82 input_report_abs(dev, spaceball_axes[i],
83 (__s16)get_unaligned_be16(&data[i * 2]));
84 }
85 break;
86
87 case 'K': /* Button data */
88 if (spaceball->idx != 3) return;
89 input_report_key(dev, BTN_1, (data[2] & 0x01) || (data[2] & 0x20));
90 input_report_key(dev, BTN_2, data[2] & 0x02);
91 input_report_key(dev, BTN_3, data[2] & 0x04);
92 input_report_key(dev, BTN_4, data[2] & 0x08);
93 input_report_key(dev, BTN_5, data[1] & 0x01);
94 input_report_key(dev, BTN_6, data[1] & 0x02);
95 input_report_key(dev, BTN_7, data[1] & 0x04);
96 input_report_key(dev, BTN_8, data[1] & 0x10);
97 break;
98
99 case '.': /* Advanced button data */
100 if (spaceball->idx != 3) return;
101 input_report_key(dev, BTN_1, data[2] & 0x01);
102 input_report_key(dev, BTN_2, data[2] & 0x02);
103 input_report_key(dev, BTN_3, data[2] & 0x04);
104 input_report_key(dev, BTN_4, data[2] & 0x08);
105 input_report_key(dev, BTN_5, data[2] & 0x10);
106 input_report_key(dev, BTN_6, data[2] & 0x20);
107 input_report_key(dev, BTN_7, data[2] & 0x80);
108 input_report_key(dev, BTN_8, data[1] & 0x01);
109 input_report_key(dev, BTN_9, data[1] & 0x02);
110 input_report_key(dev, BTN_A, data[1] & 0x04);
111 input_report_key(dev, BTN_B, data[1] & 0x08);
112 input_report_key(dev, BTN_C, data[1] & 0x10);
113 input_report_key(dev, BTN_MODE, data[1] & 0x20);
114 break;
115
116 case 'E': /* Device error */
117 spaceball->data[spaceball->idx - 1] = 0;
118 printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1);
119 break;
120
121 case '?': /* Bad command packet */
122 spaceball->data[spaceball->idx - 1] = 0;
123 printk(KERN_ERR "spaceball: Bad command. [%s]\n", spaceball->data + 1);
124 break;
125 }
126
127 input_sync(dev);
128}
129
130/*
131 * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor,
132 * and end in 0x0d. It uses '^' as an escape for CR, XOFF and XON characters which
133 * can occur in the axis values.
134 */
135
136static irqreturn_t spaceball_interrupt(struct serio *serio,
137 unsigned char data, unsigned int flags)
138{
139 struct spaceball *spaceball = serio_get_drvdata(serio);
140
141 switch (data) {
142 case 0xd:
143 spaceball_process_packet(spaceball);
144 spaceball->idx = 0;
145 spaceball->escape = 0;
146 break;
147 case '^':
148 if (!spaceball->escape) {
149 spaceball->escape = 1;
150 break;
151 }
152 spaceball->escape = 0;
153 fallthrough;
154 case 'M':
155 case 'Q':
156 case 'S':
157 if (spaceball->escape) {
158 spaceball->escape = 0;
159 data &= 0x1f;
160 }
161 fallthrough;
162 default:
163 if (spaceball->escape)
164 spaceball->escape = 0;
165 if (spaceball->idx < SPACEBALL_MAX_LENGTH)
166 spaceball->data[spaceball->idx++] = data;
167 break;
168 }
169 return IRQ_HANDLED;
170}
171
172/*
173 * spaceball_disconnect() is the opposite of spaceball_connect()
174 */
175
176static void spaceball_disconnect(struct serio *serio)
177{
178 struct spaceball* spaceball = serio_get_drvdata(serio);
179
180 serio_close(serio);
181 serio_set_drvdata(serio, NULL);
182 input_unregister_device(spaceball->dev);
183 kfree(spaceball);
184}
185
186/*
187 * spaceball_connect() is the routine that is called when someone adds a
188 * new serio device that supports Spaceball protocol and registers it as
189 * an input device.
190 */
191
192static int spaceball_connect(struct serio *serio, struct serio_driver *drv)
193{
194 struct spaceball *spaceball;
195 struct input_dev *input_dev;
196 int err = -ENOMEM;
197 int i, id;
198
199 if ((id = serio->id.id) > SPACEBALL_MAX_ID)
200 return -ENODEV;
201
202 spaceball = kmalloc_obj(*spaceball);
203 input_dev = input_allocate_device();
204 if (!spaceball || !input_dev)
205 goto fail1;
206
207 spaceball->dev = input_dev;
208 snprintf(spaceball->phys, sizeof(spaceball->phys), "%s/input0", serio->phys);
209
210 input_dev->name = spaceball_names[id];
211 input_dev->phys = spaceball->phys;
212 input_dev->id.bustype = BUS_RS232;
213 input_dev->id.vendor = SERIO_SPACEBALL;
214 input_dev->id.product = id;
215 input_dev->id.version = 0x0100;
216 input_dev->dev.parent = &serio->dev;
217
218 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
219
220 switch (id) {
221 case SPACEBALL_4000FLX:
222 case SPACEBALL_4000FLX_L:
223 input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_9);
224 input_dev->keybit[BIT_WORD(BTN_A)] |= BIT_MASK(BTN_A) |
225 BIT_MASK(BTN_B) | BIT_MASK(BTN_C) |
226 BIT_MASK(BTN_MODE);
227 fallthrough;
228 default:
229 input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_2) |
230 BIT_MASK(BTN_3) | BIT_MASK(BTN_4) |
231 BIT_MASK(BTN_5) | BIT_MASK(BTN_6) |
232 BIT_MASK(BTN_7) | BIT_MASK(BTN_8);
233 fallthrough;
234 case SPACEBALL_3003C:
235 input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1) |
236 BIT_MASK(BTN_8);
237 }
238
239 for (i = 0; i < 3; i++) {
240 input_set_abs_params(input_dev, ABS_X + i, -8000, 8000, 8, 40);
241 input_set_abs_params(input_dev, ABS_RX + i, -1600, 1600, 2, 8);
242 }
243
244 serio_set_drvdata(serio, spaceball);
245
246 err = serio_open(serio, drv);
247 if (err)
248 goto fail2;
249
250 err = input_register_device(spaceball->dev);
251 if (err)
252 goto fail3;
253
254 return 0;
255
256 fail3: serio_close(serio);
257 fail2: serio_set_drvdata(serio, NULL);
258 fail1: input_free_device(input_dev);
259 kfree(spaceball);
260 return err;
261}
262
263/*
264 * The serio driver structure.
265 */
266
267static const struct serio_device_id spaceball_serio_ids[] = {
268 {
269 .type = SERIO_RS232,
270 .proto = SERIO_SPACEBALL,
271 .id = SERIO_ANY,
272 .extra = SERIO_ANY,
273 },
274 { 0 }
275};
276
277MODULE_DEVICE_TABLE(serio, spaceball_serio_ids);
278
279static struct serio_driver spaceball_drv = {
280 .driver = {
281 .name = "spaceball",
282 },
283 .description = DRIVER_DESC,
284 .id_table = spaceball_serio_ids,
285 .interrupt = spaceball_interrupt,
286 .connect = spaceball_connect,
287 .disconnect = spaceball_disconnect,
288};
289
290module_serio_driver(spaceball_drv);