1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *	SEGA Dreamcast mouse driver
4 *	Based on drivers/usb/usbmouse.c
5 *
6 *	Copyright (c) Yaegashi Takeshi, 2001
7 *	Copyright (c) Adrian McMenamin, 2008 - 2009
8 */
9
10#include <linux/kernel.h>
11#include <linux/slab.h>
12#include <linux/input.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/timer.h>
16#include <linux/maple.h>
17
18MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
19MODULE_DESCRIPTION("SEGA Dreamcast mouse driver");
20MODULE_LICENSE("GPL");
21
22struct dc_mouse {
23	struct input_dev *dev;
24	struct maple_device *mdev;
25};
26
27static void dc_mouse_callback(struct mapleq *mq)
28{
29	int buttons, relx, rely, relz;
30	struct maple_device *mapledev = mq->dev;
31	struct dc_mouse *mse = maple_get_drvdata(mapledev);
32	struct input_dev *dev = mse->dev;
33	unsigned char *res = mq->recvbuf->buf;
34
35	buttons = ~res[8];
36	relx = *(unsigned short *)(res + 12) - 512;
37	rely = *(unsigned short *)(res + 14) - 512;
38	relz = *(unsigned short *)(res + 16) - 512;
39
40	input_report_key(dev, BTN_LEFT,   buttons & 4);
41	input_report_key(dev, BTN_MIDDLE, buttons & 9);
42	input_report_key(dev, BTN_RIGHT,  buttons & 2);
43	input_report_rel(dev, REL_X,      relx);
44	input_report_rel(dev, REL_Y,      rely);
45	input_report_rel(dev, REL_WHEEL,  relz);
46	input_sync(dev);
47}
48
49static int dc_mouse_open(struct input_dev *dev)
50{
51	struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
52
53	maple_getcond_callback(mse->mdev, dc_mouse_callback, HZ/50,
54		MAPLE_FUNC_MOUSE);
55
56	return 0;
57}
58
59static void dc_mouse_close(struct input_dev *dev)
60{
61	struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
62
63	maple_getcond_callback(mse->mdev, dc_mouse_callback, 0,
64		MAPLE_FUNC_MOUSE);
65}
66
67/* allow the mouse to be used */
68static int probe_maple_mouse(struct device *dev)
69{
70	struct maple_device *mdev = to_maple_dev(dev);
71	struct maple_driver *mdrv = to_maple_driver(dev->driver);
72	int error;
73	struct input_dev *input_dev;
74	struct dc_mouse *mse;
75
76	mse = kzalloc(sizeof(struct dc_mouse), GFP_KERNEL);
77	if (!mse) {
78		error = -ENOMEM;
79		goto fail;
80	}
81
82	input_dev = input_allocate_device();
83	if (!input_dev) {
84		error = -ENOMEM;
85		goto fail_nomem;
86	}
87
88	mse->dev = input_dev;
89	mse->mdev = mdev;
90
91	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
92	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
93		BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
94	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
95		BIT_MASK(REL_WHEEL);
96	input_dev->open = dc_mouse_open;
97	input_dev->close = dc_mouse_close;
98	input_dev->name = mdev->product_name;
99	input_dev->id.bustype = BUS_HOST;
100	error =	input_register_device(input_dev);
101	if (error)
102		goto fail_register;
103
104	mdev->driver = mdrv;
105	maple_set_drvdata(mdev, mse);
106
107	return error;
108
109fail_register:
110	input_free_device(input_dev);
111fail_nomem:
112	kfree(mse);
113fail:
114	return error;
115}
116
117static int remove_maple_mouse(struct device *dev)
118{
119	struct maple_device *mdev = to_maple_dev(dev);
120	struct dc_mouse *mse = maple_get_drvdata(mdev);
121
122	mdev->callback = NULL;
123	input_unregister_device(mse->dev);
124	maple_set_drvdata(mdev, NULL);
125	kfree(mse);
126
127	return 0;
128}
129
130static struct maple_driver dc_mouse_driver = {
131	.function =	MAPLE_FUNC_MOUSE,
132	.drv = {
133		.name = "Dreamcast_mouse",
134		.probe = probe_maple_mouse,
135		.remove = remove_maple_mouse,
136	},
137};
138
139static int __init dc_mouse_init(void)
140{
141	return maple_driver_register(&dc_mouse_driver);
142}
143
144static void __exit dc_mouse_exit(void)
145{
146	maple_driver_unregister(&dc_mouse_driver);
147}
148
149module_init(dc_mouse_init);
150module_exit(dc_mouse_exit);
151