1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SEGA Dreamcast keyboard driver
4 * Based on drivers/usb/usbkbd.c
5 * Copyright (c) YAEGASHI Takeshi, 2001
6 * Porting to 2.6 Copyright (c) Adrian McMenamin, 2007 - 2009
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/input.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/timer.h>
15 #include <linux/maple.h>
16
17 /* Very simple mutex to ensure proper cleanup */
18 static DEFINE_MUTEX(maple_keyb_mutex);
19
20 #define NR_SCANCODES 256
21
22 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk");
23 MODULE_DESCRIPTION("SEGA Dreamcast keyboard driver");
24 MODULE_LICENSE("GPL");
25
26 struct dc_kbd {
27 struct input_dev *dev;
28 unsigned short keycode[NR_SCANCODES];
29 unsigned char new[8];
30 unsigned char old[8];
31 };
32
33 static const unsigned short dc_kbd_keycode[NR_SCANCODES] = {
34 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_A, KEY_B,
35 KEY_C, KEY_D, KEY_E, KEY_F, KEY_G, KEY_H, KEY_I, KEY_J, KEY_K, KEY_L,
36 KEY_M, KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R, KEY_S, KEY_T, KEY_U, KEY_V,
37 KEY_W, KEY_X, KEY_Y, KEY_Z, KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6,
38 KEY_7, KEY_8, KEY_9, KEY_0, KEY_ENTER, KEY_ESC, KEY_BACKSPACE,
39 KEY_TAB, KEY_SPACE, KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE,
40 KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_BACKSLASH, KEY_SEMICOLON,
41 KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT, KEY_SLASH,
42 KEY_CAPSLOCK, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6,
43 KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, KEY_SYSRQ,
44 KEY_SCROLLLOCK, KEY_PAUSE, KEY_INSERT, KEY_HOME, KEY_PAGEUP,
45 KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT, KEY_LEFT, KEY_DOWN,
46 KEY_UP, KEY_NUMLOCK, KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS,
47 KEY_KPPLUS, KEY_KPENTER, KEY_KP1, KEY_KP2, KEY_KP3, KEY_KP4, KEY_KP5,
48 KEY_KP6, KEY_KP7, KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT, KEY_102ND,
49 KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, KEY_F13, KEY_F14, KEY_F15,
50 KEY_F16, KEY_F17, KEY_F18, KEY_F19, KEY_F20, KEY_F21, KEY_F22,
51 KEY_F23, KEY_F24, KEY_OPEN, KEY_HELP, KEY_PROPS, KEY_FRONT, KEY_STOP,
52 KEY_AGAIN, KEY_UNDO, KEY_CUT, KEY_COPY, KEY_PASTE, KEY_FIND, KEY_MUTE,
53 KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
54 KEY_KPCOMMA, KEY_RESERVED, KEY_RO, KEY_KATAKANAHIRAGANA , KEY_YEN,
55 KEY_HENKAN, KEY_MUHENKAN, KEY_KPJPCOMMA, KEY_RESERVED, KEY_RESERVED,
56 KEY_RESERVED, KEY_HANGEUL, KEY_HANJA, KEY_KATAKANA, KEY_HIRAGANA,
57 KEY_ZENKAKUHANKAKU, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
58 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
59 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
60 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
61 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
62 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
63 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
64 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
65 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
66 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
67 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
68 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
69 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
70 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
71 KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
72 KEY_RESERVED, KEY_RESERVED, KEY_LEFTCTRL, KEY_LEFTSHIFT, KEY_LEFTALT,
73 KEY_LEFTMETA, KEY_RIGHTCTRL, KEY_RIGHTSHIFT, KEY_RIGHTALT,
74 KEY_RIGHTMETA, KEY_PLAYPAUSE, KEY_STOPCD, KEY_PREVIOUSSONG,
75 KEY_NEXTSONG, KEY_EJECTCD, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE,
76 KEY_WWW, KEY_BACK, KEY_FORWARD, KEY_STOP, KEY_FIND, KEY_SCROLLUP,
77 KEY_SCROLLDOWN, KEY_EDIT, KEY_SLEEP, KEY_SCREENLOCK, KEY_REFRESH,
78 KEY_CALC, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED
79 };
80
dc_scan_kbd(struct dc_kbd * kbd)81 static void dc_scan_kbd(struct dc_kbd *kbd)
82 {
83 struct input_dev *dev = kbd->dev;
84 void *ptr;
85 int code, keycode;
86 int i;
87
88 for (i = 0; i < 8; i++) {
89 code = i + 224;
90 keycode = kbd->keycode[code];
91 input_event(dev, EV_MSC, MSC_SCAN, code);
92 input_report_key(dev, keycode, (kbd->new[0] >> i) & 1);
93 }
94
95 for (i = 2; i < 8; i++) {
96 ptr = memchr(kbd->new + 2, kbd->old[i], 6);
97 code = kbd->old[i];
98 if (code > 3 && ptr == NULL) {
99 keycode = kbd->keycode[code];
100 if (keycode) {
101 input_event(dev, EV_MSC, MSC_SCAN, code);
102 input_report_key(dev, keycode, 0);
103 } else
104 dev_dbg(&dev->dev,
105 "Unknown key (scancode %#x) released.",
106 code);
107 }
108 ptr = memchr(kbd->old + 2, kbd->new[i], 6);
109 code = kbd->new[i];
110 if (code > 3 && ptr) {
111 keycode = kbd->keycode[code];
112 if (keycode) {
113 input_event(dev, EV_MSC, MSC_SCAN, code);
114 input_report_key(dev, keycode, 1);
115 } else
116 dev_dbg(&dev->dev,
117 "Unknown key (scancode %#x) pressed.",
118 code);
119 }
120 }
121 input_sync(dev);
122 memcpy(kbd->old, kbd->new, 8);
123 }
124
dc_kbd_callback(struct mapleq * mq)125 static void dc_kbd_callback(struct mapleq *mq)
126 {
127 struct maple_device *mapledev = mq->dev;
128 struct dc_kbd *kbd = maple_get_drvdata(mapledev);
129 unsigned long *buf = (unsigned long *)(mq->recvbuf->buf);
130
131 /*
132 * We should always get the lock because the only
133 * time it may be locked is if the driver is in the cleanup phase.
134 */
135 if (likely(mutex_trylock(&maple_keyb_mutex))) {
136
137 if (buf[1] == mapledev->function) {
138 memcpy(kbd->new, buf + 2, 8);
139 dc_scan_kbd(kbd);
140 }
141
142 mutex_unlock(&maple_keyb_mutex);
143 }
144 }
145
probe_maple_kbd(struct device * dev)146 static int probe_maple_kbd(struct device *dev)
147 {
148 struct maple_device *mdev;
149 struct maple_driver *mdrv;
150 int i, error;
151 struct dc_kbd *kbd;
152 struct input_dev *idev;
153
154 mdev = to_maple_dev(dev);
155 mdrv = to_maple_driver(dev->driver);
156
157 kbd = kzalloc(sizeof(struct dc_kbd), GFP_KERNEL);
158 if (!kbd) {
159 error = -ENOMEM;
160 goto fail;
161 }
162
163 idev = input_allocate_device();
164 if (!idev) {
165 error = -ENOMEM;
166 goto fail_idev_alloc;
167 }
168
169 kbd->dev = idev;
170 memcpy(kbd->keycode, dc_kbd_keycode, sizeof(kbd->keycode));
171
172 idev->name = mdev->product_name;
173 idev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
174 idev->keycode = kbd->keycode;
175 idev->keycodesize = sizeof(unsigned short);
176 idev->keycodemax = ARRAY_SIZE(kbd->keycode);
177 idev->id.bustype = BUS_HOST;
178 idev->dev.parent = &mdev->dev;
179
180 for (i = 0; i < NR_SCANCODES; i++)
181 __set_bit(dc_kbd_keycode[i], idev->keybit);
182 __clear_bit(KEY_RESERVED, idev->keybit);
183
184 input_set_capability(idev, EV_MSC, MSC_SCAN);
185
186 error = input_register_device(idev);
187 if (error)
188 goto fail_register;
189
190 /* Maple polling is locked to VBLANK - which may be just 50/s */
191 maple_getcond_callback(mdev, dc_kbd_callback, HZ/50,
192 MAPLE_FUNC_KEYBOARD);
193
194 mdev->driver = mdrv;
195
196 maple_set_drvdata(mdev, kbd);
197
198 return error;
199
200 fail_register:
201 maple_set_drvdata(mdev, NULL);
202 input_free_device(idev);
203 fail_idev_alloc:
204 kfree(kbd);
205 fail:
206 return error;
207 }
208
remove_maple_kbd(struct device * dev)209 static int remove_maple_kbd(struct device *dev)
210 {
211 struct maple_device *mdev = to_maple_dev(dev);
212 struct dc_kbd *kbd = maple_get_drvdata(mdev);
213
214 mutex_lock(&maple_keyb_mutex);
215
216 input_unregister_device(kbd->dev);
217 kfree(kbd);
218
219 maple_set_drvdata(mdev, NULL);
220
221 mutex_unlock(&maple_keyb_mutex);
222 return 0;
223 }
224
225 static struct maple_driver dc_kbd_driver = {
226 .function = MAPLE_FUNC_KEYBOARD,
227 .drv = {
228 .name = "Dreamcast_keyboard",
229 .probe = probe_maple_kbd,
230 .remove = remove_maple_kbd,
231 },
232 };
233
dc_kbd_init(void)234 static int __init dc_kbd_init(void)
235 {
236 return maple_driver_register(&dc_kbd_driver);
237 }
238
dc_kbd_exit(void)239 static void __exit dc_kbd_exit(void)
240 {
241 maple_driver_unregister(&dc_kbd_driver);
242 }
243
244 module_init(dc_kbd_init);
245 module_exit(dc_kbd_exit);
246