1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *	SEGA Dreamcast controller driver
4  *	Based on drivers/usb/iforce.c
5  *
6  *	Copyright Yaegashi Takeshi, 2001
7  *	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 
18 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
19 MODULE_DESCRIPTION("SEGA Dreamcast controller driver");
20 MODULE_LICENSE("GPL");
21 
22 struct dc_pad {
23 	struct input_dev *dev;
24 	struct maple_device *mdev;
25 };
26 
27 static void dc_pad_callback(struct mapleq *mq)
28 {
29 	unsigned short buttons;
30 	struct maple_device *mapledev = mq->dev;
31 	struct dc_pad *pad = maple_get_drvdata(mapledev);
32 	struct input_dev *dev = pad->dev;
33 	unsigned char *res = mq->recvbuf->buf;
34 
35 	buttons = ~le16_to_cpup((__le16 *)(res + 8));
36 
37 	input_report_abs(dev, ABS_HAT0Y,
38 		(buttons & 0x0010 ? -1 : 0) + (buttons & 0x0020 ? 1 : 0));
39 	input_report_abs(dev, ABS_HAT0X,
40 		(buttons & 0x0040 ? -1 : 0) + (buttons & 0x0080 ? 1 : 0));
41 	input_report_abs(dev, ABS_HAT1Y,
42 		(buttons & 0x1000 ? -1 : 0) + (buttons & 0x2000 ? 1 : 0));
43 	input_report_abs(dev, ABS_HAT1X,
44 		(buttons & 0x4000 ? -1 : 0) + (buttons & 0x8000 ? 1 : 0));
45 
46 	input_report_key(dev, BTN_C,      buttons & 0x0001);
47 	input_report_key(dev, BTN_B,      buttons & 0x0002);
48 	input_report_key(dev, BTN_A,      buttons & 0x0004);
49 	input_report_key(dev, BTN_START,  buttons & 0x0008);
50 	input_report_key(dev, BTN_Z,      buttons & 0x0100);
51 	input_report_key(dev, BTN_Y,      buttons & 0x0200);
52 	input_report_key(dev, BTN_X,      buttons & 0x0400);
53 	input_report_key(dev, BTN_SELECT, buttons & 0x0800);
54 
55 	input_report_abs(dev, ABS_GAS,    res[10]);
56 	input_report_abs(dev, ABS_BRAKE,  res[11]);
57 	input_report_abs(dev, ABS_X,      res[12]);
58 	input_report_abs(dev, ABS_Y,      res[13]);
59 	input_report_abs(dev, ABS_RX,     res[14]);
60 	input_report_abs(dev, ABS_RY,     res[15]);
61 }
62 
63 static int dc_pad_open(struct input_dev *dev)
64 {
65 	struct dc_pad *pad = dev_get_platdata(&dev->dev);
66 
67 	maple_getcond_callback(pad->mdev, dc_pad_callback, HZ/20,
68 		MAPLE_FUNC_CONTROLLER);
69 
70 	return 0;
71 }
72 
73 static void dc_pad_close(struct input_dev *dev)
74 {
75 	struct dc_pad *pad = dev_get_platdata(&dev->dev);
76 
77 	maple_getcond_callback(pad->mdev, dc_pad_callback, 0,
78 		MAPLE_FUNC_CONTROLLER);
79 }
80 
81 /* allow the controller to be used */
82 static int probe_maple_controller(struct device *dev)
83 {
84 	static const short btn_bit[32] = {
85 		BTN_C, BTN_B, BTN_A, BTN_START, -1, -1, -1, -1,
86 		BTN_Z, BTN_Y, BTN_X, BTN_SELECT, -1, -1, -1, -1,
87 		-1, -1, -1, -1, -1, -1, -1, -1,
88 		-1, -1, -1, -1, -1, -1, -1, -1,
89 	};
90 
91 	static const short abs_bit[32] = {
92 		-1, -1, -1, -1, ABS_HAT0Y, ABS_HAT0Y, ABS_HAT0X, ABS_HAT0X,
93 		-1, -1, -1, -1, ABS_HAT1Y, ABS_HAT1Y, ABS_HAT1X, ABS_HAT1X,
94 		ABS_GAS, ABS_BRAKE, ABS_X, ABS_Y, ABS_RX, ABS_RY, -1, -1,
95 		-1, -1, -1, -1, -1, -1, -1, -1,
96 	};
97 
98 	struct maple_device *mdev = to_maple_dev(dev);
99 	struct maple_driver *mdrv = to_maple_driver(dev->driver);
100 	int i, error;
101 	struct dc_pad *pad;
102 	struct input_dev *idev;
103 	unsigned long data = be32_to_cpu(mdev->devinfo.function_data[0]);
104 
105 	pad = kzalloc(sizeof(struct dc_pad), GFP_KERNEL);
106 	idev = input_allocate_device();
107 	if (!pad || !idev) {
108 		error = -ENOMEM;
109 		goto fail;
110 	}
111 
112 	pad->dev = idev;
113 	pad->mdev = mdev;
114 
115 	idev->open = dc_pad_open;
116 	idev->close = dc_pad_close;
117 
118 	for (i = 0; i < 32; i++) {
119 		if (data & (1 << i)) {
120 			if (btn_bit[i] >= 0)
121 				__set_bit(btn_bit[i], idev->keybit);
122 			else if (abs_bit[i] >= 0)
123 				__set_bit(abs_bit[i], idev->absbit);
124 		}
125 	}
126 
127 	if (idev->keybit[BIT_WORD(BTN_JOYSTICK)])
128 		idev->evbit[0] |= BIT_MASK(EV_KEY);
129 
130 	if (idev->absbit[0])
131 		idev->evbit[0] |= BIT_MASK(EV_ABS);
132 
133 	for (i = ABS_X; i <= ABS_BRAKE; i++)
134 		input_set_abs_params(idev, i, 0, 255, 0, 0);
135 
136 	for (i = ABS_HAT0X; i <= ABS_HAT3Y; i++)
137 		input_set_abs_params(idev, i, 1, -1, 0, 0);
138 
139 	idev->dev.platform_data = pad;
140 	idev->dev.parent = &mdev->dev;
141 	idev->name = mdev->product_name;
142 	idev->id.bustype = BUS_HOST;
143 
144 	error = input_register_device(idev);
145 	if (error)
146 		goto fail;
147 
148 	mdev->driver = mdrv;
149 	maple_set_drvdata(mdev, pad);
150 
151 	return 0;
152 
153 fail:
154 	input_free_device(idev);
155 	kfree(pad);
156 	maple_set_drvdata(mdev, NULL);
157 	return error;
158 }
159 
160 static int remove_maple_controller(struct device *dev)
161 {
162 	struct maple_device *mdev = to_maple_dev(dev);
163 	struct dc_pad *pad = maple_get_drvdata(mdev);
164 
165 	mdev->callback = NULL;
166 	input_unregister_device(pad->dev);
167 	maple_set_drvdata(mdev, NULL);
168 	kfree(pad);
169 
170 	return 0;
171 }
172 
173 static struct maple_driver dc_pad_driver = {
174 	.function =	MAPLE_FUNC_CONTROLLER,
175 	.drv = {
176 		.name	= "Dreamcast_controller",
177 		.probe	= probe_maple_controller,
178 		.remove	= remove_maple_controller,
179 	},
180 };
181 
182 static int __init dc_pad_init(void)
183 {
184 	return maple_driver_register(&dc_pad_driver);
185 }
186 
187 static void __exit dc_pad_exit(void)
188 {
189 	maple_driver_unregister(&dc_pad_driver);
190 }
191 
192 module_init(dc_pad_init);
193 module_exit(dc_pad_exit);
194