1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 1999-2001 Vojtech Pavlik
7 * Magellan and Space Mouse 6dof controller driver for Linux
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/input.h>
14 #include <linux/serio.h>
16 #define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver"
18 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
19 MODULE_DESCRIPTION(DRIVER_DESC);
20 MODULE_LICENSE("GPL");
23 * Definitions & global arrays.
26 #define MAGELLAN_MAX_LENGTH 32
28 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
29 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
36 struct input_dev *dev;
38 unsigned char data[MAGELLAN_MAX_LENGTH];
43 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
44 * have correct upper nibbles for the lower ones, if not, the packet will
45 * be thrown away. It also strips these upper halves to simplify further
49 static int magellan_crunch_nibbles(unsigned char *data, int count)
51 static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
54 if (data[count] == nibbles[data[count] & 0xf])
55 data[count] = data[count] & 0xf;
63 static void magellan_process_packet(struct magellan* magellan)
65 struct input_dev *dev = magellan->dev;
66 unsigned char *data = magellan->data;
69 if (!magellan->idx) return;
71 switch (magellan->data[0]) {
73 case 'd': /* Axis data */
74 if (magellan->idx != 25) return;
75 if (magellan_crunch_nibbles(data, 24)) return;
76 for (i = 0; i < 6; i++)
77 input_report_abs(dev, magellan_axes[i],
78 (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
79 data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768);
82 case 'k': /* Button data */
83 if (magellan->idx != 4) return;
84 if (magellan_crunch_nibbles(data, 3)) return;
85 t = (data[1] << 1) | (data[2] << 5) | data[3];
86 for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
93 static irqreturn_t magellan_interrupt(struct serio *serio,
94 unsigned char data, unsigned int flags)
96 struct magellan* magellan = serio_get_drvdata(serio);
99 magellan_process_packet(magellan);
102 if (magellan->idx < MAGELLAN_MAX_LENGTH)
103 magellan->data[magellan->idx++] = data;
109 * magellan_disconnect() is the opposite of magellan_connect()
112 static void magellan_disconnect(struct serio *serio)
114 struct magellan* magellan = serio_get_drvdata(serio);
117 serio_set_drvdata(serio, NULL);
118 input_unregister_device(magellan->dev);
123 * magellan_connect() is the routine that is called when someone adds a
124 * new serio device that supports Magellan protocol and registers it as
128 static int magellan_connect(struct serio *serio, struct serio_driver *drv)
130 struct magellan *magellan;
131 struct input_dev *input_dev;
135 magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
136 input_dev = input_allocate_device();
137 if (!magellan || !input_dev)
140 magellan->dev = input_dev;
141 snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
143 input_dev->name = "LogiCad3D Magellan / SpaceMouse";
144 input_dev->phys = magellan->phys;
145 input_dev->id.bustype = BUS_RS232;
146 input_dev->id.vendor = SERIO_MAGELLAN;
147 input_dev->id.product = 0x0001;
148 input_dev->id.version = 0x0100;
149 input_dev->dev.parent = &serio->dev;
151 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
153 for (i = 0; i < 9; i++)
154 set_bit(magellan_buttons[i], input_dev->keybit);
156 for (i = 0; i < 6; i++)
157 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
159 serio_set_drvdata(serio, magellan);
161 err = serio_open(serio, drv);
165 err = input_register_device(magellan->dev);
171 fail3: serio_close(serio);
172 fail2: serio_set_drvdata(serio, NULL);
173 fail1: input_free_device(input_dev);
179 * The serio driver structure.
182 static const struct serio_device_id magellan_serio_ids[] = {
185 .proto = SERIO_MAGELLAN,
192 MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
194 static struct serio_driver magellan_drv = {
198 .description = DRIVER_DESC,
199 .id_table = magellan_serio_ids,
200 .interrupt = magellan_interrupt,
201 .connect = magellan_connect,
202 .disconnect = magellan_disconnect,
205 module_serio_driver(magellan_drv);