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f5f2cc64 JW |
1 | /* ir-mce_kbd-decoder.c - A decoder for the RC6-ish keyboard/mouse IR protocol |
2 | * used by the Microsoft Remote Keyboard for Windows Media Center Edition, | |
3 | * referred to by Microsoft's Windows Media Center remote specification docs | |
4 | * as "an internal protocol called MCIR-2". | |
5 | * | |
6 | * Copyright (C) 2011 by Jarod Wilson <jarod@redhat.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include "rc-core-priv.h" | |
19 | ||
20 | /* | |
21 | * This decoder currently supports: | |
22 | * - MCIR-2 29-bit IR signals used for mouse movement and buttons | |
23 | * - MCIR-2 32-bit IR signals used for standard keyboard keys | |
24 | * | |
25 | * The media keys on the keyboard send RC-6 signals that are inditinguishable | |
26 | * from the keys of the same name on the stock MCE remote, and will be handled | |
27 | * by the standard RC-6 decoder, and be made available to the system via the | |
28 | * input device for the remote, rather than the keyboard/mouse one. | |
29 | */ | |
30 | ||
31 | #define MCIR2_UNIT 333333 /* ns */ | |
32 | #define MCIR2_HEADER_NBITS 5 | |
33 | #define MCIR2_MOUSE_NBITS 29 | |
34 | #define MCIR2_KEYBOARD_NBITS 32 | |
35 | #define MCIR2_PREFIX_PULSE (8 * MCIR2_UNIT) | |
36 | #define MCIR2_PREFIX_SPACE (1 * MCIR2_UNIT) | |
37 | #define MCIR2_MAX_LEN (3 * MCIR2_UNIT) | |
38 | #define MCIR2_BIT_START (1 * MCIR2_UNIT) | |
39 | #define MCIR2_BIT_END (1 * MCIR2_UNIT) | |
40 | #define MCIR2_BIT_0 (1 * MCIR2_UNIT) | |
41 | #define MCIR2_BIT_SET (2 * MCIR2_UNIT) | |
42 | #define MCIR2_MODE_MASK 0xf /* for the header bits */ | |
43 | #define MCIR2_KEYBOARD_HEADER 0x4 | |
44 | #define MCIR2_MOUSE_HEADER 0x1 | |
45 | #define MCIR2_MASK_KEYS_START 0xe0 | |
46 | ||
47 | enum mce_kbd_mode { | |
48 | MCIR2_MODE_KEYBOARD, | |
49 | MCIR2_MODE_MOUSE, | |
50 | MCIR2_MODE_UNKNOWN, | |
51 | }; | |
52 | ||
53 | enum mce_kbd_state { | |
54 | STATE_INACTIVE, | |
55 | STATE_HEADER_BIT_START, | |
56 | STATE_HEADER_BIT_END, | |
57 | STATE_BODY_BIT_START, | |
58 | STATE_BODY_BIT_END, | |
59 | STATE_FINISHED, | |
60 | }; | |
61 | ||
62 | static unsigned char kbd_keycodes[256] = { | |
63 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_A, | |
64 | KEY_B, KEY_C, KEY_D, KEY_E, KEY_F, | |
65 | KEY_G, KEY_H, KEY_I, KEY_J, KEY_K, | |
66 | KEY_L, KEY_M, KEY_N, KEY_O, KEY_P, | |
67 | KEY_Q, KEY_R, KEY_S, KEY_T, KEY_U, | |
68 | KEY_V, KEY_W, KEY_X, KEY_Y, KEY_Z, | |
69 | KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, | |
70 | KEY_6, KEY_7, KEY_8, KEY_9, KEY_0, | |
71 | KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, KEY_SPACE, | |
72 | KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, | |
73 | KEY_RESERVED, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, | |
74 | KEY_DOT, KEY_SLASH, KEY_CAPSLOCK, KEY_F1, KEY_F2, | |
75 | KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, | |
76 | KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, | |
77 | KEY_SYSRQ, KEY_SCROLLLOCK, KEY_PAUSE, KEY_INSERT, KEY_HOME, | |
78 | KEY_PAGEUP, KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT, | |
79 | KEY_LEFT, KEY_DOWN, KEY_UP, KEY_NUMLOCK, KEY_KPSLASH, | |
80 | KEY_KPASTERISK, KEY_KPMINUS, KEY_KPPLUS, KEY_KPENTER, KEY_KP1, | |
81 | KEY_KP2, KEY_KP3, KEY_KP4, KEY_KP5, KEY_KP6, | |
82 | KEY_KP7, KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT, | |
83 | KEY_102ND, KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, KEY_F13, | |
84 | KEY_F14, KEY_F15, KEY_F16, KEY_F17, KEY_F18, | |
85 | KEY_F19, KEY_F20, KEY_F21, KEY_F22, KEY_F23, | |
86 | KEY_F24, KEY_OPEN, KEY_HELP, KEY_PROPS, KEY_FRONT, | |
87 | KEY_STOP, KEY_AGAIN, KEY_UNDO, KEY_CUT, KEY_COPY, | |
88 | KEY_PASTE, KEY_FIND, KEY_MUTE, KEY_VOLUMEUP, KEY_VOLUMEDOWN, | |
89 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_KPCOMMA, KEY_RESERVED, | |
90 | KEY_RO, KEY_KATAKANAHIRAGANA, KEY_YEN, KEY_HENKAN, KEY_MUHENKAN, | |
91 | KEY_KPJPCOMMA, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_HANGUEL, | |
92 | KEY_HANJA, KEY_KATAKANA, KEY_HIRAGANA, KEY_ZENKAKUHANKAKU, KEY_RESERVED, | |
93 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
94 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
95 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
96 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
97 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
98 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
99 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
100 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
101 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
102 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
103 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
104 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
105 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
106 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
107 | KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_LEFTCTRL, | |
108 | KEY_LEFTSHIFT, KEY_LEFTALT, KEY_LEFTMETA, KEY_RIGHTCTRL, KEY_RIGHTSHIFT, | |
109 | KEY_RIGHTALT, KEY_RIGHTMETA, KEY_PLAYPAUSE, KEY_STOPCD, KEY_PREVIOUSSONG, | |
110 | KEY_NEXTSONG, KEY_EJECTCD, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE, | |
111 | KEY_WWW, KEY_BACK, KEY_FORWARD, KEY_STOP, KEY_FIND, | |
112 | KEY_SCROLLUP, KEY_SCROLLDOWN, KEY_EDIT, KEY_SLEEP, KEY_COFFEE, | |
113 | KEY_REFRESH, KEY_CALC, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, | |
114 | KEY_RESERVED | |
115 | }; | |
116 | ||
117 | static void mce_kbd_rx_timeout(unsigned long data) | |
118 | { | |
119 | struct mce_kbd_dec *mce_kbd = (struct mce_kbd_dec *)data; | |
120 | int i; | |
121 | unsigned char maskcode; | |
122 | ||
123 | IR_dprintk(2, "timer callback clearing all keys\n"); | |
124 | ||
125 | for (i = 0; i < 7; i++) { | |
126 | maskcode = kbd_keycodes[MCIR2_MASK_KEYS_START + i]; | |
127 | input_report_key(mce_kbd->idev, maskcode, 0); | |
128 | } | |
129 | ||
130 | for (i = 0; i < MCIR2_MASK_KEYS_START; i++) | |
131 | input_report_key(mce_kbd->idev, kbd_keycodes[i], 0); | |
132 | } | |
133 | ||
134 | static enum mce_kbd_mode mce_kbd_mode(struct mce_kbd_dec *data) | |
135 | { | |
136 | switch (data->header & MCIR2_MODE_MASK) { | |
137 | case MCIR2_KEYBOARD_HEADER: | |
138 | return MCIR2_MODE_KEYBOARD; | |
139 | case MCIR2_MOUSE_HEADER: | |
140 | return MCIR2_MODE_MOUSE; | |
141 | default: | |
142 | return MCIR2_MODE_UNKNOWN; | |
143 | } | |
144 | } | |
145 | ||
146 | static void ir_mce_kbd_process_keyboard_data(struct input_dev *idev, | |
147 | u32 scancode) | |
148 | { | |
149 | u8 keydata = (scancode >> 8) & 0xff; | |
150 | u8 shiftmask = scancode & 0xff; | |
151 | unsigned char keycode, maskcode; | |
152 | int i, keystate; | |
153 | ||
154 | IR_dprintk(1, "keyboard: keydata = 0x%02x, shiftmask = 0x%02x\n", | |
155 | keydata, shiftmask); | |
156 | ||
157 | for (i = 0; i < 7; i++) { | |
158 | maskcode = kbd_keycodes[MCIR2_MASK_KEYS_START + i]; | |
159 | if (shiftmask & (1 << i)) | |
160 | keystate = 1; | |
161 | else | |
162 | keystate = 0; | |
163 | input_report_key(idev, maskcode, keystate); | |
164 | } | |
165 | ||
166 | if (keydata) { | |
167 | keycode = kbd_keycodes[keydata]; | |
168 | input_report_key(idev, keycode, 1); | |
169 | } else { | |
170 | for (i = 0; i < MCIR2_MASK_KEYS_START; i++) | |
171 | input_report_key(idev, kbd_keycodes[i], 0); | |
172 | } | |
173 | } | |
174 | ||
175 | static void ir_mce_kbd_process_mouse_data(struct input_dev *idev, u32 scancode) | |
176 | { | |
177 | /* raw mouse coordinates */ | |
178 | u8 xdata = (scancode >> 7) & 0x7f; | |
179 | u8 ydata = (scancode >> 14) & 0x7f; | |
180 | int x, y; | |
181 | /* mouse buttons */ | |
182 | bool right = scancode & 0x40; | |
183 | bool left = scancode & 0x20; | |
184 | ||
185 | if (xdata & 0x40) | |
186 | x = -((~xdata & 0x7f) + 1); | |
187 | else | |
188 | x = xdata; | |
189 | ||
190 | if (ydata & 0x40) | |
191 | y = -((~ydata & 0x7f) + 1); | |
192 | else | |
193 | y = ydata; | |
194 | ||
195 | IR_dprintk(1, "mouse: x = %d, y = %d, btns = %s%s\n", | |
196 | x, y, left ? "L" : "", right ? "R" : ""); | |
197 | ||
198 | input_report_rel(idev, REL_X, x); | |
199 | input_report_rel(idev, REL_Y, y); | |
200 | ||
201 | input_report_key(idev, BTN_LEFT, left); | |
202 | input_report_key(idev, BTN_RIGHT, right); | |
203 | } | |
204 | ||
205 | /** | |
206 | * ir_mce_kbd_decode() - Decode one mce_kbd pulse or space | |
207 | * @dev: the struct rc_dev descriptor of the device | |
208 | * @ev: the struct ir_raw_event descriptor of the pulse/space | |
209 | * | |
210 | * This function returns -EINVAL if the pulse violates the state machine | |
211 | */ | |
212 | static int ir_mce_kbd_decode(struct rc_dev *dev, struct ir_raw_event ev) | |
213 | { | |
214 | struct mce_kbd_dec *data = &dev->raw->mce_kbd; | |
215 | u32 scancode; | |
216 | unsigned long delay; | |
217 | ||
218 | if (!(dev->raw->enabled_protocols & RC_TYPE_MCE_KBD)) | |
219 | return 0; | |
220 | ||
221 | if (!is_timing_event(ev)) { | |
222 | if (ev.reset) | |
223 | data->state = STATE_INACTIVE; | |
224 | return 0; | |
225 | } | |
226 | ||
227 | if (!geq_margin(ev.duration, MCIR2_UNIT, MCIR2_UNIT / 2)) | |
228 | goto out; | |
229 | ||
230 | again: | |
231 | IR_dprintk(2, "started at state %i (%uus %s)\n", | |
232 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
233 | ||
234 | if (!geq_margin(ev.duration, MCIR2_UNIT, MCIR2_UNIT / 2)) | |
235 | return 0; | |
236 | ||
237 | switch (data->state) { | |
238 | ||
239 | case STATE_INACTIVE: | |
240 | if (!ev.pulse) | |
241 | break; | |
242 | ||
243 | /* Note: larger margin on first pulse since each MCIR2_UNIT | |
244 | is quite short and some hardware takes some time to | |
245 | adjust to the signal */ | |
246 | if (!eq_margin(ev.duration, MCIR2_PREFIX_PULSE, MCIR2_UNIT)) | |
247 | break; | |
248 | ||
249 | data->state = STATE_HEADER_BIT_START; | |
250 | data->count = 0; | |
251 | data->header = 0; | |
252 | return 0; | |
253 | ||
254 | case STATE_HEADER_BIT_START: | |
255 | if (geq_margin(ev.duration, MCIR2_MAX_LEN, MCIR2_UNIT / 2)) | |
256 | break; | |
257 | ||
258 | data->header <<= 1; | |
259 | if (ev.pulse) | |
260 | data->header |= 1; | |
261 | data->count++; | |
262 | data->state = STATE_HEADER_BIT_END; | |
263 | return 0; | |
264 | ||
265 | case STATE_HEADER_BIT_END: | |
266 | if (!is_transition(&ev, &dev->raw->prev_ev)) | |
267 | break; | |
268 | ||
269 | decrease_duration(&ev, MCIR2_BIT_END); | |
270 | ||
271 | if (data->count != MCIR2_HEADER_NBITS) { | |
272 | data->state = STATE_HEADER_BIT_START; | |
273 | goto again; | |
274 | } | |
275 | ||
276 | switch (mce_kbd_mode(data)) { | |
277 | case MCIR2_MODE_KEYBOARD: | |
278 | data->wanted_bits = MCIR2_KEYBOARD_NBITS; | |
279 | break; | |
280 | case MCIR2_MODE_MOUSE: | |
281 | data->wanted_bits = MCIR2_MOUSE_NBITS; | |
282 | break; | |
283 | default: | |
284 | IR_dprintk(1, "not keyboard or mouse data\n"); | |
285 | goto out; | |
286 | } | |
287 | ||
288 | data->count = 0; | |
289 | data->body = 0; | |
290 | data->state = STATE_BODY_BIT_START; | |
291 | goto again; | |
292 | ||
293 | case STATE_BODY_BIT_START: | |
294 | if (geq_margin(ev.duration, MCIR2_MAX_LEN, MCIR2_UNIT / 2)) | |
295 | break; | |
296 | ||
297 | data->body <<= 1; | |
298 | if (ev.pulse) | |
299 | data->body |= 1; | |
300 | data->count++; | |
301 | data->state = STATE_BODY_BIT_END; | |
302 | return 0; | |
303 | ||
304 | case STATE_BODY_BIT_END: | |
305 | if (!is_transition(&ev, &dev->raw->prev_ev)) | |
306 | break; | |
307 | ||
308 | if (data->count == data->wanted_bits) | |
309 | data->state = STATE_FINISHED; | |
310 | else | |
311 | data->state = STATE_BODY_BIT_START; | |
312 | ||
313 | decrease_duration(&ev, MCIR2_BIT_END); | |
314 | goto again; | |
315 | ||
316 | case STATE_FINISHED: | |
317 | if (ev.pulse) | |
318 | break; | |
319 | ||
320 | switch (data->wanted_bits) { | |
321 | case MCIR2_KEYBOARD_NBITS: | |
322 | scancode = data->body & 0xffff; | |
323 | IR_dprintk(1, "keyboard data 0x%08x\n", data->body); | |
324 | if (dev->timeout) | |
325 | delay = usecs_to_jiffies(dev->timeout / 1000); | |
326 | else | |
327 | delay = msecs_to_jiffies(100); | |
328 | mod_timer(&data->rx_timeout, jiffies + delay); | |
329 | /* Pass data to keyboard buffer parser */ | |
330 | ir_mce_kbd_process_keyboard_data(data->idev, scancode); | |
331 | break; | |
332 | case MCIR2_MOUSE_NBITS: | |
333 | scancode = data->body & 0x1fffff; | |
334 | IR_dprintk(1, "mouse data 0x%06x\n", scancode); | |
335 | /* Pass data to mouse buffer parser */ | |
336 | ir_mce_kbd_process_mouse_data(data->idev, scancode); | |
337 | break; | |
338 | default: | |
339 | IR_dprintk(1, "not keyboard or mouse data\n"); | |
340 | goto out; | |
341 | } | |
342 | ||
343 | data->state = STATE_INACTIVE; | |
344 | input_sync(data->idev); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | out: | |
349 | IR_dprintk(1, "failed at state %i (%uus %s)\n", | |
350 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
351 | data->state = STATE_INACTIVE; | |
352 | input_sync(data->idev); | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
356 | static int ir_mce_kbd_register(struct rc_dev *dev) | |
357 | { | |
358 | struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd; | |
359 | struct input_dev *idev; | |
360 | int i, ret; | |
361 | ||
362 | idev = input_allocate_device(); | |
363 | if (!idev) | |
364 | return -ENOMEM; | |
365 | ||
366 | snprintf(mce_kbd->name, sizeof(mce_kbd->name), | |
367 | "MCE IR Keyboard/Mouse (%s)", dev->driver_name); | |
368 | strlcat(mce_kbd->phys, "/input0", sizeof(mce_kbd->phys)); | |
369 | ||
370 | idev->name = mce_kbd->name; | |
371 | idev->phys = mce_kbd->phys; | |
372 | ||
373 | /* Keyboard bits */ | |
374 | set_bit(EV_KEY, idev->evbit); | |
375 | set_bit(EV_REP, idev->evbit); | |
376 | for (i = 0; i < sizeof(kbd_keycodes); i++) | |
377 | set_bit(kbd_keycodes[i], idev->keybit); | |
378 | ||
379 | /* Mouse bits */ | |
380 | set_bit(EV_REL, idev->evbit); | |
381 | set_bit(REL_X, idev->relbit); | |
382 | set_bit(REL_Y, idev->relbit); | |
383 | set_bit(BTN_LEFT, idev->keybit); | |
384 | set_bit(BTN_RIGHT, idev->keybit); | |
385 | ||
386 | /* Report scancodes too */ | |
387 | set_bit(EV_MSC, idev->evbit); | |
388 | set_bit(MSC_SCAN, idev->mscbit); | |
389 | ||
390 | setup_timer(&mce_kbd->rx_timeout, mce_kbd_rx_timeout, | |
391 | (unsigned long)mce_kbd); | |
392 | ||
393 | input_set_drvdata(idev, mce_kbd); | |
394 | ||
395 | #if 0 | |
396 | /* Adding this reference means two input devices are associated with | |
397 | * this rc-core device, which ir-keytable doesn't cope with yet */ | |
398 | idev->dev.parent = &dev->dev; | |
399 | #endif | |
400 | ||
401 | ret = input_register_device(idev); | |
402 | if (ret < 0) { | |
403 | input_free_device(idev); | |
404 | return -EIO; | |
405 | } | |
406 | ||
407 | mce_kbd->idev = idev; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int ir_mce_kbd_unregister(struct rc_dev *dev) | |
413 | { | |
414 | struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd; | |
415 | struct input_dev *idev = mce_kbd->idev; | |
416 | ||
417 | del_timer_sync(&mce_kbd->rx_timeout); | |
418 | input_unregister_device(idev); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | static struct ir_raw_handler mce_kbd_handler = { | |
424 | .protocols = RC_TYPE_MCE_KBD, | |
425 | .decode = ir_mce_kbd_decode, | |
426 | .raw_register = ir_mce_kbd_register, | |
427 | .raw_unregister = ir_mce_kbd_unregister, | |
428 | }; | |
429 | ||
430 | static int __init ir_mce_kbd_decode_init(void) | |
431 | { | |
432 | ir_raw_handler_register(&mce_kbd_handler); | |
433 | ||
434 | printk(KERN_INFO "IR MCE Keyboard/mouse protocol handler initialized\n"); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static void __exit ir_mce_kbd_decode_exit(void) | |
439 | { | |
440 | ir_raw_handler_unregister(&mce_kbd_handler); | |
441 | } | |
442 | ||
443 | module_init(ir_mce_kbd_decode_init); | |
444 | module_exit(ir_mce_kbd_decode_exit); | |
445 | ||
446 | MODULE_LICENSE("GPL"); | |
447 | MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>"); | |
448 | MODULE_DESCRIPTION("MCE Keyboard/mouse IR protocol decoder"); |