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/drivers/input/joystick/magellan.c

http://github.com/mirrors/linux
C | 208 lines | 133 code | 43 blank | 32 comment | 23 complexity | 8a9288c15501ae4d562386ff6a733ed3 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  Copyright (c) 1999-2001 Vojtech Pavlik
  4 */
  5
  6/*
  7 * Magellan and Space Mouse 6dof controller driver for Linux
  8 */
  9
 10/*
 11 */
 12
 13#include <linux/kernel.h>
 14#include <linux/module.h>
 15#include <linux/slab.h>
 16#include <linux/input.h>
 17#include <linux/serio.h>
 18
 19#define DRIVER_DESC	"Magellan and SpaceMouse 6dof controller driver"
 20
 21MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 22MODULE_DESCRIPTION(DRIVER_DESC);
 23MODULE_LICENSE("GPL");
 24
 25/*
 26 * Definitions & global arrays.
 27 */
 28
 29#define	MAGELLAN_MAX_LENGTH	32
 30
 31static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
 32static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
 33
 34/*
 35 * Per-Magellan data.
 36 */
 37
 38struct magellan {
 39	struct input_dev *dev;
 40	int idx;
 41	unsigned char data[MAGELLAN_MAX_LENGTH];
 42	char phys[32];
 43};
 44
 45/*
 46 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
 47 * have correct upper nibbles for the lower ones, if not, the packet will
 48 * be thrown away. It also strips these upper halves to simplify further
 49 * processing.
 50 */
 51
 52static int magellan_crunch_nibbles(unsigned char *data, int count)
 53{
 54	static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
 55
 56	do {
 57		if (data[count] == nibbles[data[count] & 0xf])
 58			data[count] = data[count] & 0xf;
 59		else
 60			return -1;
 61	} while (--count);
 62
 63	return 0;
 64}
 65
 66static void magellan_process_packet(struct magellan* magellan)
 67{
 68	struct input_dev *dev = magellan->dev;
 69	unsigned char *data = magellan->data;
 70	int i, t;
 71
 72	if (!magellan->idx) return;
 73
 74	switch (magellan->data[0]) {
 75
 76		case 'd':				/* Axis data */
 77			if (magellan->idx != 25) return;
 78			if (magellan_crunch_nibbles(data, 24)) return;
 79			for (i = 0; i < 6; i++)
 80				input_report_abs(dev, magellan_axes[i],
 81					(data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
 82					 data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
 83			break;
 84
 85		case 'k':				/* Button data */
 86			if (magellan->idx != 4) return;
 87			if (magellan_crunch_nibbles(data, 3)) return;
 88			t = (data[1] << 1) | (data[2] << 5) | data[3];
 89			for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
 90			break;
 91	}
 92
 93	input_sync(dev);
 94}
 95
 96static irqreturn_t magellan_interrupt(struct serio *serio,
 97		unsigned char data, unsigned int flags)
 98{
 99	struct magellan* magellan = serio_get_drvdata(serio);
100
101	if (data == '\r') {
102		magellan_process_packet(magellan);
103		magellan->idx = 0;
104	} else {
105		if (magellan->idx < MAGELLAN_MAX_LENGTH)
106			magellan->data[magellan->idx++] = data;
107	}
108	return IRQ_HANDLED;
109}
110
111/*
112 * magellan_disconnect() is the opposite of magellan_connect()
113 */
114
115static void magellan_disconnect(struct serio *serio)
116{
117	struct magellan* magellan = serio_get_drvdata(serio);
118
119	serio_close(serio);
120	serio_set_drvdata(serio, NULL);
121	input_unregister_device(magellan->dev);
122	kfree(magellan);
123}
124
125/*
126 * magellan_connect() is the routine that is called when someone adds a
127 * new serio device that supports Magellan protocol and registers it as
128 * an input device.
129 */
130
131static int magellan_connect(struct serio *serio, struct serio_driver *drv)
132{
133	struct magellan *magellan;
134	struct input_dev *input_dev;
135	int err = -ENOMEM;
136	int i;
137
138	magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
139	input_dev = input_allocate_device();
140	if (!magellan || !input_dev)
141		goto fail1;
142
143	magellan->dev = input_dev;
144	snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
145
146	input_dev->name = "LogiCad3D Magellan / SpaceMouse";
147	input_dev->phys = magellan->phys;
148	input_dev->id.bustype = BUS_RS232;
149	input_dev->id.vendor = SERIO_MAGELLAN;
150	input_dev->id.product = 0x0001;
151	input_dev->id.version = 0x0100;
152	input_dev->dev.parent = &serio->dev;
153
154	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
155
156	for (i = 0; i < 9; i++)
157		set_bit(magellan_buttons[i], input_dev->keybit);
158
159	for (i = 0; i < 6; i++)
160		input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
161
162	serio_set_drvdata(serio, magellan);
163
164	err = serio_open(serio, drv);
165	if (err)
166		goto fail2;
167
168	err = input_register_device(magellan->dev);
169	if (err)
170		goto fail3;
171
172	return 0;
173
174 fail3:	serio_close(serio);
175 fail2:	serio_set_drvdata(serio, NULL);
176 fail1:	input_free_device(input_dev);
177	kfree(magellan);
178	return err;
179}
180
181/*
182 * The serio driver structure.
183 */
184
185static const struct serio_device_id magellan_serio_ids[] = {
186	{
187		.type	= SERIO_RS232,
188		.proto	= SERIO_MAGELLAN,
189		.id	= SERIO_ANY,
190		.extra	= SERIO_ANY,
191	},
192	{ 0 }
193};
194
195MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
196
197static struct serio_driver magellan_drv = {
198	.driver		= {
199		.name	= "magellan",
200	},
201	.description	= DRIVER_DESC,
202	.id_table	= magellan_serio_ids,
203	.interrupt	= magellan_interrupt,
204	.connect	= magellan_connect,
205	.disconnect	= magellan_disconnect,
206};
207
208module_serio_driver(magellan_drv);