1 // SPDX-License-Identifier: GPL-2.0+
3 * Translate key codes into ASCII
5 * Copyright (c) 2011 The Chromium OS Authors.
6 * (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de
15 #include <stdio_dev.h>
17 #ifdef CONFIG_DM_KEYBOARD
20 #include <linux/input.h>
23 /* These correspond to the lights on the keyboard */
24 FLAG_SCROLL_LOCK = 1 << 0,
25 FLAG_NUM_LOCK = 1 << 1,
26 FLAG_CAPS_LOCK = 1 << 2,
28 /* Special flag ORed with key code to indicate release */
29 KEY_RELEASE = 1 << 15,
34 * These takes map key codes to ASCII. 0xff means no key, or special key.
35 * Three tables are provided - one for plain keys, one for when the shift
36 * 'modifier' key is pressed and one for when the ctrl modifier key is
39 static const uchar kbd_plain_xlate[] = {
40 0xff, 0x1b, '1', '2', '3', '4', '5', '6',
41 '7', '8', '9', '0', '-', '=', '\b', '\t', /* 0x00 - 0x0f */
42 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
43 'o', 'p', '[', ']', '\r', 0xff, 'a', 's', /* 0x10 - 0x1f */
44 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
45 '\'', '`', 0xff, '\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */
46 'b', 'n', 'm', ',' , '.', '/', 0xff, 0xff, 0xff,
47 ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */
48 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
49 '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
50 '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff,
51 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */
55 static unsigned char kbd_shift_xlate[] = {
56 0xff, 0x1b, '!', '@', '#', '$', '%', '^',
57 '&', '*', '(', ')', '_', '+', '\b', '\t', /* 0x00 - 0x0f */
58 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
59 'O', 'P', '{', '}', '\r', 0xff, 'A', 'S', /* 0x10 - 0x1f */
60 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
61 '"', '~', 0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */
62 'B', 'N', 'M', '<', '>', '?', 0xff, 0xff, 0xff,
63 ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */
64 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
65 '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
66 '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, 0xff,
67 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */
71 static unsigned char kbd_ctrl_xlate[] = {
72 0xff, 0x1b, '1', 0x00, '3', '4', '5', 0x1E,
73 '7', '8', '9', '0', 0x1F, '=', '\b', '\t', /* 0x00 - 0x0f */
74 0x11, 0x17, 0x05, 0x12, 0x14, 0x19, 0x15, 0x09,
75 0x0f, 0x10, 0x1b, 0x1d, '\n', 0xff, 0x01, 0x13, /* 0x10 - 0x1f */
76 0x04, 0x06, 0x08, 0x09, 0x0a, 0x0b, 0x0c, ';',
77 '\'', '~', 0x00, 0x1c, 0x1a, 0x18, 0x03, 0x16, /* 0x20 - 0x2f */
78 0x02, 0x0e, 0x0d, '<', '>', '?', 0xff, 0xff,
79 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */
80 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
81 '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
82 '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff,
83 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */
88 * German keymap. Special letters are mapped according to code page 437.
90 static const uchar kbd_plain_xlate_german[] = {
91 0xff, 0x1b, '1', '2', '3', '4', '5', '6', /* scan 00-07 */
92 '7', '8', '9', '0', 0xe1, '\'', 0x08, '\t', /* scan 08-0F */
93 'q', 'w', 'e', 'r', 't', 'z', 'u', 'i', /* scan 10-17 */
94 'o', 'p', 0x81, '+', '\r', 0xff, 'a', 's', /* scan 18-1F */
95 'd', 'f', 'g', 'h', 'j', 'k', 'l', 0x94, /* scan 20-27 */
96 0x84, '^', 0xff, '#', 'y', 'x', 'c', 'v', /* scan 28-2F */
97 'b', 'n', 'm', ',', '.', '-', 0xff, '*', /* scan 30-37 */
98 ' ', ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
99 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7', /* scan 40-47 */
100 '8', '9', '-', '4', '5', '6', '+', '1', /* scan 48-4F */
101 '2', '3', '0', ',', 0xff, 0xff, '<', 0xff, /* scan 50-57 */
102 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
103 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
104 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
105 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
106 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
107 '\r', 0xff, '/', '*',
110 static unsigned char kbd_shift_xlate_german[] = {
111 0xff, 0x1b, '!', '"', 0x15, '$', '%', '&', /* scan 00-07 */
112 '/', '(', ')', '=', '?', '`', 0x08, '\t', /* scan 08-0F */
113 'Q', 'W', 'E', 'R', 'T', 'Z', 'U', 'I', /* scan 10-17 */
114 'O', 'P', 0x9a, '*', '\r', 0xff, 'A', 'S', /* scan 18-1F */
115 'D', 'F', 'G', 'H', 'J', 'K', 'L', 0x99, /* scan 20-27 */
116 0x8e, 0xf8, 0xff, '\'', 'Y', 'X', 'C', 'V', /* scan 28-2F */
117 'B', 'N', 'M', ';', ':', '_', 0xff, '*', /* scan 30-37 */
118 ' ', ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
119 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7', /* scan 40-47 */
120 '8', '9', '-', '4', '5', '6', '+', '1', /* scan 48-4F */
121 '2', '3', '0', ',', 0xff, 0xff, '>', 0xff, /* scan 50-57 */
122 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
123 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
124 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
125 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
126 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
127 '\r', 0xff, '/', '*',
130 static unsigned char kbd_right_alt_xlate_german[] = {
131 0xff, 0xff, 0xff, 0xfd, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
132 '{', '[', ']', '}', '\\', 0xff, 0xff, 0xff, /* scan 08-0F */
133 '@', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 10-17 */
134 0xff, 0xff, 0xff, '~', 0xff, 0xff, 0xff, 0xff, /* scan 18-1F */
135 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 20-27 */
136 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 28-2F */
137 0xff, 0xff, 0xe6, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 30-37 */
138 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
139 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 40-47 */
140 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
141 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '|', 0xff, /* scan 50-57 */
145 KBD_ENGLISH = 1 << 0,
149 static struct kbd_entry {
150 int kbd_mask; /* Which languages this is for */
151 int left_keycode; /* Left keycode to select this map */
152 int right_keycode; /* Right keycode to select this map */
153 const uchar *xlate; /* Ascii code for each keycode */
154 int num_entries; /* Number of entries in xlate */
156 { KBD_ENGLISH, -1, -1,
157 kbd_plain_xlate, ARRAY_SIZE(kbd_plain_xlate) },
158 { KBD_GERMAN, -1, -1,
159 kbd_plain_xlate_german, ARRAY_SIZE(kbd_plain_xlate_german) },
160 { KBD_ENGLISH, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
161 kbd_shift_xlate, ARRAY_SIZE(kbd_shift_xlate) },
162 { KBD_GERMAN, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
163 kbd_shift_xlate_german, ARRAY_SIZE(kbd_shift_xlate_german) },
164 { KBD_ENGLISH | KBD_GERMAN, KEY_LEFTCTRL, KEY_RIGHTCTRL,
165 kbd_ctrl_xlate, ARRAY_SIZE(kbd_ctrl_xlate) },
166 { KBD_GERMAN, -1, KEY_RIGHTALT,
167 kbd_right_alt_xlate_german,
168 ARRAY_SIZE(kbd_right_alt_xlate_german) },
173 * Scan key code to ANSI 3.64 escape sequence table. This table is
174 * incomplete in that it does not include all possible extra keys.
179 } kbd_to_ansi364[] = {
181 { KEY_DOWN, "\033[B"},
182 { KEY_RIGHT, "\033[C"},
183 { KEY_LEFT, "\033[D"},
186 /* Maximum number of output characters that an ANSI sequence expands to */
187 #define ANSI_CHAR_MAX 3
189 static int input_queue_ascii(struct input_config *config, int ch)
191 if (config->fifo_in + 1 == INPUT_BUFFER_LEN) {
192 if (!config->fifo_out)
193 return -1; /* buffer full */
197 if (config->fifo_in + 1 == config->fifo_out)
198 return -1; /* buffer full */
201 debug(" {%02x} ", ch);
202 config->fifo[config->fifo_in] = (uchar)ch;
207 int input_tstc(struct input_config *config)
209 if (config->fifo_in == config->fifo_out && config->read_keys) {
210 if (!(*config->read_keys)(config))
213 return config->fifo_in != config->fifo_out;
216 int input_getc(struct input_config *config)
220 while (config->fifo_in == config->fifo_out) {
221 if (config->read_keys)
222 err = (*config->read_keys)(config);
227 if (++config->fifo_out == INPUT_BUFFER_LEN)
228 config->fifo_out = 0;
230 return config->fifo[config->fifo_out];
234 * Process a modifier/special key press or release and decide which key
235 * translation array should be used as a result.
237 * TODO: Should keep track of modifier press/release
239 * @param config Input state
240 * @param key Key code to process
241 * @param release 0 if a press, 1 if a release
242 * @return pointer to keycode->ascii translation table that should be used
244 static struct input_key_xlate *process_modifier(struct input_config *config,
245 int key, int release)
247 #ifdef CONFIG_DM_KEYBOARD
248 struct udevice *dev = config->dev;
249 struct keyboard_ops *ops = keyboard_get_ops(dev);
251 struct input_key_xlate *table;
254 /* Start with the main table, and see what modifiers change it */
255 assert(config->num_tables > 0);
256 table = &config->table[0];
257 for (i = 1; i < config->num_tables; i++) {
258 struct input_key_xlate *tab = &config->table[i];
260 if (key == tab->left_keycode || key == tab->right_keycode)
264 /* Handle the lighted keys */
270 flip = FLAG_SCROLL_LOCK;
273 flip = FLAG_NUM_LOCK;
276 flip = FLAG_CAPS_LOCK;
283 config->flags ^= flip;
284 if (config->flags & FLAG_NUM_LOCK)
285 leds |= INPUT_LED_NUM;
286 if (config->flags & FLAG_CAPS_LOCK)
287 leds |= INPUT_LED_CAPS;
288 if (config->flags & FLAG_SCROLL_LOCK)
289 leds |= INPUT_LED_SCROLL;
291 config->leds_changed = flip;
293 #ifdef CONFIG_DM_KEYBOARD
294 if (ops->update_leds) {
295 if (ops->update_leds(dev, config->leds))
296 debug("Update keyboard's LED failed\n");
306 * Search an int array for a key value
308 * @param array Array to search
309 * @param count Number of elements in array
310 * @param key Key value to find
311 * @return element where value was first found, -1 if none
313 static int array_search(int *array, int count, int key)
317 for (i = 0; i < count; i++) {
326 * Sort an array so that those elements that exist in the ordering are
327 * first in the array, and in the same order as the ordering. The algorithm
328 * is O(count * ocount) and designed for small arrays.
330 * TODO: Move this to common / lib?
332 * @param dest Array with elements to sort, also destination array
333 * @param count Number of elements to sort
334 * @param order Array containing ordering elements
335 * @param ocount Number of ordering elements
336 * @return number of elements in dest that are in order (these will be at the
339 static int sort_array_by_ordering(int *dest, int count, int *order,
344 int same; /* number of elements which are the same */
347 /* setup output items, copy items to be sorted into our temp area */
348 memcpy(temp, dest, count * sizeof(*dest));
351 /* work through the ordering, move over the elements we agree on */
352 for (i = 0; i < ocount; i++) {
353 if (array_search(temp, count, order[i]) != -1)
354 dest[dest_count++] = order[i];
358 /* now move over the elements that are not in the ordering */
359 for (i = 0; i < count; i++) {
360 if (array_search(order, ocount, temp[i]) == -1)
361 dest[dest_count++] = temp[i];
363 assert(dest_count == count);
368 * Check a list of key codes against the previous key scan
370 * Given a list of new key codes, we check how many of these are the same
373 * @param config Input state
374 * @param keycode List of key codes to examine
375 * @param num_keycodes Number of key codes
376 * @param same Returns number of key codes which are the same
378 static int input_check_keycodes(struct input_config *config,
379 int keycode[], int num_keycodes, int *same)
381 /* Select the 'plain' xlate table to start with */
382 if (!config->num_tables) {
383 debug("%s: No xlate tables: cannot decode keys\n", __func__);
387 /* sort the keycodes into the same order as the previous ones */
388 *same = sort_array_by_ordering(keycode, num_keycodes,
389 config->prev_keycodes, config->num_prev_keycodes);
391 memcpy(config->prev_keycodes, keycode, num_keycodes * sizeof(int));
392 config->num_prev_keycodes = num_keycodes;
394 return *same != num_keycodes;
398 * Checks and converts a special key code into ANSI 3.64 escape sequence.
400 * @param config Input state
401 * @param keycode Key code to examine
402 * @param output_ch Buffer to place output characters into. It should
403 * be at least ANSI_CHAR_MAX bytes long, to allow for
405 * @param max_chars Maximum number of characters to add to output_ch
406 * @return number of characters output, if the key was converted, otherwise 0.
407 * This may be larger than max_chars, in which case the overflow
408 * characters are not output.
410 static int input_keycode_to_ansi364(struct input_config *config,
411 int keycode, char output_ch[], int max_chars)
417 for (i = ch_count = 0; i < ARRAY_SIZE(kbd_to_ansi364); i++) {
418 if (keycode != kbd_to_ansi364[i].kbd_scan_code)
420 for (escape = kbd_to_ansi364[i].escape; *escape; escape++) {
421 if (ch_count < max_chars)
422 output_ch[ch_count] = *escape;
432 * Converts and queues a list of key codes in escaped ASCII string form
433 * Convert a list of key codes into ASCII
435 * You must call input_check_keycodes() before this. It turns the keycode
436 * list into a list of ASCII characters and sends them to the input layer.
438 * Characters which were seen last time do not generate fresh ASCII output.
439 * The output (calls to queue_ascii) may be longer than num_keycodes, if the
440 * keycode contains special keys that was encoded to longer escaped sequence.
442 * @param config Input state
443 * @param keycode List of key codes to examine
444 * @param num_keycodes Number of key codes
445 * @param output_ch Buffer to place output characters into. It should
446 * be at last ANSI_CHAR_MAX * num_keycodes, to allow for
448 * @param max_chars Maximum number of characters to add to output_ch
449 * @param same Number of key codes which are the same
450 * @return number of characters written into output_ch, or -1 if we would
451 * exceed max_chars chars.
453 static int input_keycodes_to_ascii(struct input_config *config,
454 int keycode[], int num_keycodes, char output_ch[],
455 int max_chars, int same)
457 struct input_key_xlate *table;
461 table = &config->table[0];
463 /* deal with modifiers first */
464 for (i = 0; i < num_keycodes; i++) {
465 int key = keycode[i] & KEY_MASK;
467 if (key >= table->num_entries || table->xlate[key] == 0xff) {
468 table = process_modifier(config, key,
469 keycode[i] & KEY_RELEASE);
473 /* Start conversion by looking for the first new keycode (by same). */
474 for (i = same; i < num_keycodes; i++) {
475 int key = keycode[i];
479 * For a normal key (with an ASCII value), add it; otherwise
480 * translate special key to escape sequence if possible.
482 if (key < table->num_entries) {
483 ch = table->xlate[key];
484 if ((config->flags & FLAG_CAPS_LOCK) &&
485 ch >= 'a' && ch <= 'z')
487 /* ban digit numbers if 'Num Lock' is not on */
488 if (!(config->flags & FLAG_NUM_LOCK)) {
489 if (key >= KEY_KP7 && key <= KEY_KPDOT &&
490 key != KEY_KPMINUS && key != KEY_KPPLUS)
493 if (ch_count < max_chars && ch != 0xff)
494 output_ch[ch_count++] = (uchar)ch;
496 ch_count += input_keycode_to_ansi364(config, key,
497 output_ch, max_chars);
501 if (ch_count > max_chars) {
502 debug("%s: Output char buffer overflow size=%d, need=%d\n",
503 __func__, max_chars, ch_count);
507 /* ok, so return keys */
511 static int _input_send_keycodes(struct input_config *config, int keycode[],
512 int num_keycodes, bool do_send)
514 char ch[num_keycodes * ANSI_CHAR_MAX];
515 int count, i, same = 0;
519 config->modifiers = 0;
520 if (!input_check_keycodes(config, keycode, num_keycodes, &same)) {
522 * Same as last time - is it time for another repeat?
523 * TODO(sjg@chromium.org) We drop repeats here and since
524 * the caller may not call in again for a while, our
525 * auto-repeat speed is not quite correct. We should
526 * insert another character if we later realise that we
527 * have missed a repeat slot.
529 is_repeat = config->allow_repeats || (config->repeat_rate_ms &&
530 (int)get_timer(config->next_repeat_ms) >= 0);
535 count = input_keycodes_to_ascii(config, keycode, num_keycodes,
536 ch, sizeof(ch), is_repeat ? 0 : same);
538 for (i = 0; i < count; i++)
539 input_queue_ascii(config, ch[i]);
541 delay_ms = is_repeat ?
542 config->repeat_rate_ms :
543 config->repeat_delay_ms;
545 config->next_repeat_ms = get_timer(0) + delay_ms;
550 int input_send_keycodes(struct input_config *config, int keycode[],
553 return _input_send_keycodes(config, keycode, num_keycodes, true);
556 int input_add_keycode(struct input_config *config, int new_keycode,
559 int keycode[INPUT_MAX_MODIFIERS + 1];
562 /* Add the old keycodes which are not removed by this new one */
563 for (i = 0, count = 0; i < config->num_prev_keycodes; i++) {
564 int code = config->prev_keycodes[i];
566 if (new_keycode == code) {
571 keycode[count++] = code;
574 if (!release && new_keycode != -1)
575 keycode[count++] = new_keycode;
576 debug("\ncodes for %02x/%d: ", new_keycode, release);
577 for (i = 0; i < count; i++)
578 debug("%02x ", keycode[i]);
581 /* Don't output any ASCII characters if this is a key release */
582 return _input_send_keycodes(config, keycode, count, !release);
585 int input_add_table(struct input_config *config, int left_keycode,
586 int right_keycode, const uchar *xlate, int num_entries)
588 struct input_key_xlate *table;
590 if (config->num_tables == INPUT_MAX_MODIFIERS) {
591 debug("%s: Too many modifier tables\n", __func__);
595 table = &config->table[config->num_tables++];
596 table->left_keycode = left_keycode;
597 table->right_keycode = right_keycode;
598 table->xlate = xlate;
599 table->num_entries = num_entries;
604 void input_set_delays(struct input_config *config, int repeat_delay_ms,
607 config->repeat_delay_ms = repeat_delay_ms;
608 config->repeat_rate_ms = repeat_rate_ms;
611 void input_allow_repeats(struct input_config *config, bool allow_repeats)
613 config->allow_repeats = allow_repeats;
616 int input_leds_changed(struct input_config *config)
618 if (config->leds_changed)
624 int input_add_tables(struct input_config *config, bool german)
626 struct kbd_entry *entry;
630 mask = german ? KBD_GERMAN : KBD_ENGLISH;
631 for (entry = kbd_entry; entry->kbd_mask; entry++) {
632 if (!(mask & entry->kbd_mask))
634 ret = input_add_table(config, entry->left_keycode,
635 entry->right_keycode, entry->xlate,
644 int input_init(struct input_config *config, int leds)
646 memset(config, '\0', sizeof(*config));
652 int input_stdio_register(struct stdio_dev *dev)
656 error = stdio_register(dev);
657 #if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(ENV_SUPPORT)
658 /* check if this is the standard input device */
659 if (!error && strcmp(env_get("stdin"), dev->name) == 0) {
660 /* reassign the console */
661 if (OVERWRITE_CONSOLE ||
662 console_assign(stdin, dev->name))