drivers/input/input.c

   1 /*
   2  * Translate key codes into ASCII
   3  *
   4  * Copyright (c) 2011 The Chromium OS Authors.
   5  * (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <console.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14 #include <stdio_dev.h>
  15 #include <input.h>
  16 #ifdef CONFIG_DM_KEYBOARD
  17 #include <keyboard.h>
  18 #endif
  19 #include <linux/input.h>
  20
  21 enum {
  22         /* These correspond to the lights on the keyboard */
  23         FLAG_SCROLL_LOCK        = 1 << 0,
  24         FLAG_NUM_LOCK           = 1 << 1,
  25         FLAG_CAPS_LOCK          = 1 << 2,
  26
  27         /* Special flag ORed with key code to indicate release */
  28         KEY_RELEASE             = 1 << 15,
  29         KEY_MASK                = 0xfff,
  30 };
  31
  32 /*
  33  * These takes map key codes to ASCII. 0xff means no key, or special key.
  34  * Three tables are provided - one for plain keys, one for when the shift
  35  * 'modifier' key is pressed and one for when the ctrl modifier key is
  36  * pressed.
  37  */
  38 static const uchar kbd_plain_xlate[] = {
  39         0xff, 0x1b, '1',  '2',  '3',  '4',  '5',  '6',
  40         '7',  '8',  '9',  '0',  '-',  '=', '\b', '\t',  /* 0x00 - 0x0f */
  41         'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',
  42         'o',  'p',  '[',  ']', '\r', 0xff,  'a',  's',  /* 0x10 - 0x1f */
  43         'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',
  44         '\'',  '`', 0xff, '\\', 'z',  'x',  'c',  'v',  /* 0x20 - 0x2f */
  45         'b',  'n',  'm',  ',' ,  '.', '/', 0xff, 0xff, 0xff,
  46         ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,        /* 0x30 - 0x3f */
  47         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7',
  48         '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',  /* 0x40 - 0x4f */
  49         '2',  '3',  '0',  '.', 0xff, 0xff, 0xff, 0xff,
  50         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */
  51         '\r', 0xff, '/',  '*',
  52 };
  53
  54 static unsigned char kbd_shift_xlate[] = {
  55         0xff, 0x1b, '!', '@', '#', '$', '%', '^',
  56         '&', '*', '(', ')', '_', '+', '\b', '\t',       /* 0x00 - 0x0f */
  57         'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
  58         'O', 'P', '{', '}', '\r', 0xff, 'A', 'S',       /* 0x10 - 0x1f */
  59         'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
  60         '"', '~', 0xff, '|', 'Z', 'X', 'C', 'V',        /* 0x20 - 0x2f */
  61         'B', 'N', 'M', '<', '>', '?', 0xff, 0xff, 0xff,
  62         ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,        /* 0x30 - 0x3f */
  63         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
  64         '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
  65         '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, 0xff,
  66         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,       /* 0x50 - 0x5F */
  67         '\r', 0xff, '/',  '*',
  68 };
  69
  70 static unsigned char kbd_ctrl_xlate[] = {
  71         0xff, 0x1b, '1', 0x00, '3', '4', '5', 0x1E,
  72         '7', '8', '9', '0', 0x1F, '=', '\b', '\t',      /* 0x00 - 0x0f */
  73         0x11, 0x17, 0x05, 0x12, 0x14, 0x19, 0x15, 0x09,
  74         0x0f, 0x10, 0x1b, 0x1d, '\n', 0xff, 0x01, 0x13, /* 0x10 - 0x1f */
  75         0x04, 0x06, 0x08, 0x09, 0x0a, 0x0b, 0x0c, ';',
  76         '\'', '~', 0x00, 0x1c, 0x1a, 0x18, 0x03, 0x16,  /* 0x20 - 0x2f */
  77         0x02, 0x0e, 0x0d, '<', '>', '?', 0xff, 0xff,
  78         0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x30 - 0x3f */
  79         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
  80         '8', '9', '-', '4', '5', '6', '+', '1',         /* 0x40 - 0x4f */
  81         '2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff,
  82         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x50 - 0x5F */
  83         '\r', 0xff, '/',  '*',
  84 };
  85
  86 static const uchar kbd_plain_xlate_german[] = {
  87         0xff, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
  88          '7',  '8',  '9',  '0', 0xe1, '\'', 0x08, '\t', /* scan 08-0F */
  89          'q',  'w',  'e',  'r',  't',  'z',  'u',  'i', /* scan 10-17 */
  90          'o',  'p', 0x81,  '+', '\r', 0xff,  'a',  's', /* scan 18-1F */
  91          'd',  'f',  'g',  'h',  'j',  'k',  'l', 0x94, /* scan 20-27 */
  92         0x84,  '^', 0xff,  '#',  'y',  'x',  'c',  'v', /* scan 28-2F */
  93          'b',  'n',  'm',  ',',  '.',  '-', 0xff,  '*', /* scan 30-37 */
  94          ' ',  ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
  95         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7', /* scan 40-47 */
  96          '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
  97          '2',  '3',  '0',  ',', 0xff, 0xff,  '<', 0xff, /* scan 50-57 */
  98         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
  99         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
 100         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
 101         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
 102         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
 103         '\r', 0xff,  '/',  '*',
 104 };
 105
 106 static unsigned char kbd_shift_xlate_german[] = {
 107            0xff, 0x1b,  '!',  '"', 0x15,  '$',  '%',  '&', /* scan 00-07 */
 108          '/',  '(',  ')',  '=',  '?',  '`', 0x08, '\t', /* scan 08-0F */
 109          'Q',  'W',  'E',  'R',  'T',  'Z',  'U',  'I', /* scan 10-17 */
 110          'O',  'P', 0x9a,  '*', '\r', 0xff,  'A',  'S', /* scan 18-1F */
 111          'D',  'F',  'G',  'H',  'J',  'K',  'L', 0x99, /* scan 20-27 */
 112         0x8e, 0xf8, 0xff, '\'',  'Y',  'X',  'C',  'V', /* scan 28-2F */
 113          'B',  'N',  'M',  ';',  ':',  '_', 0xff,  '*', /* scan 30-37 */
 114          ' ',  ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
 115         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7', /* scan 40-47 */
 116          '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
 117          '2',  '3',  '0',  ',', 0xff, 0xff,  '>', 0xff, /* scan 50-57 */
 118         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
 119         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
 120         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
 121         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
 122         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
 123         '\r', 0xff,  '/',  '*',
 124 };
 125
 126 static unsigned char kbd_right_alt_xlate_german[] = {
 127         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
 128          '{',  '[',  ']',  '}', '\\', 0xff, 0xff, 0xff, /* scan 08-0F */
 129          '@', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 10-17 */
 130         0xff, 0xff, 0xff,  '~', 0xff, 0xff, 0xff, 0xff, /* scan 18-1F */
 131         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 20-27 */
 132         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 28-2F */
 133         0xff, 0xff, 0xe6, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 30-37 */
 134         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
 135         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 40-47 */
 136         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
 137         0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '|', 0xff, /* scan 50-57 */
 138 };
 139
 140 enum kbd_mask {
 141         KBD_ENGLISH     = 1 << 0,
 142         KBD_GERMAN      = 1 << 1,
 143 };
 144
 145 static struct kbd_entry {
 146         int kbd_mask;           /* Which languages this is for */
 147         int left_keycode;       /* Left keycode to select this map */
 148         int right_keycode;      /* Right keycode to select this map */
 149         const uchar *xlate;     /* Ascii code for each keycode */
 150         int num_entries;        /* Number of entries in xlate */
 151 } kbd_entry[] = {
 152         { KBD_ENGLISH, -1, -1,
 153                 kbd_plain_xlate, ARRAY_SIZE(kbd_plain_xlate) },
 154         { KBD_GERMAN, -1, -1,
 155                 kbd_plain_xlate_german, ARRAY_SIZE(kbd_plain_xlate_german) },
 156         { KBD_ENGLISH, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
 157                 kbd_shift_xlate, ARRAY_SIZE(kbd_shift_xlate) },
 158         { KBD_GERMAN, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
 159                 kbd_shift_xlate_german, ARRAY_SIZE(kbd_shift_xlate_german) },
 160         { KBD_ENGLISH | KBD_GERMAN, KEY_LEFTCTRL, KEY_RIGHTCTRL,
 161                 kbd_ctrl_xlate, ARRAY_SIZE(kbd_ctrl_xlate) },
 162         { KBD_GERMAN, -1, KEY_RIGHTALT,
 163                 kbd_right_alt_xlate_german,
 164                 ARRAY_SIZE(kbd_right_alt_xlate_german) },
 165         {},
 166 };
 167
 168 /*
 169  * Scan key code to ANSI 3.64 escape sequence table.  This table is
 170  * incomplete in that it does not include all possible extra keys.
 171  */
 172 static struct {
 173         int kbd_scan_code;
 174         char *escape;
 175 } kbd_to_ansi364[] = {
 176         { KEY_UP, "\033[A"},
 177         { KEY_DOWN, "\033[B"},
 178         { KEY_RIGHT, "\033[C"},
 179         { KEY_LEFT, "\033[D"},
 180 };
 181
 182 /* Maximum number of output characters that an ANSI sequence expands to */
 183 #define ANSI_CHAR_MAX   3
 184
 185 static int input_queue_ascii(struct input_config *config, int ch)
 186 {
 187         if (config->fifo_in + 1 == INPUT_BUFFER_LEN) {
 188                 if (!config->fifo_out)
 189                         return -1; /* buffer full */
 190                 else
 191                         config->fifo_in = 0;
 192         } else {
 193                 if (config->fifo_in + 1 == config->fifo_out)
 194                         return -1; /* buffer full */
 195                 config->fifo_in++;
 196         }
 197         debug(" {%02x} ", ch);
 198         config->fifo[config->fifo_in] = (uchar)ch;
 199
 200         return 0;
 201 }
 202
 203 int input_tstc(struct input_config *config)
 204 {
 205         if (config->fifo_in == config->fifo_out && config->read_keys) {
 206                 if (!(*config->read_keys)(config))
 207                         return 0;
 208         }
 209         return config->fifo_in != config->fifo_out;
 210 }
 211
 212 int input_getc(struct input_config *config)
 213 {
 214         int err = 0;
 215
 216         while (config->fifo_in == config->fifo_out) {
 217                 if (config->read_keys)
 218                         err = (*config->read_keys)(config);
 219                 if (err)
 220                         return -1;
 221         }
 222
 223         if (++config->fifo_out == INPUT_BUFFER_LEN)
 224                 config->fifo_out = 0;
 225
 226         return config->fifo[config->fifo_out];
 227 }
 228
 229 /**
 230  * Process a modifier/special key press or release and decide which key
 231  * translation array should be used as a result.
 232  *
 233  * TODO: Should keep track of modifier press/release
 234  *
 235  * @param config        Input state
 236  * @param key           Key code to process
 237  * @param release       0 if a press, 1 if a release
 238  * @return pointer to keycode->ascii translation table that should be used
 239  */
 240 static struct input_key_xlate *process_modifier(struct input_config *config,
 241                                                 int key, int release)
 242 {
 243 #ifdef CONFIG_DM_KEYBOARD
 244         struct udevice *dev = config->dev;
 245         struct keyboard_ops *ops = keyboard_get_ops(dev);
 246 #endif
 247         struct input_key_xlate *table;
 248         int i;
 249
 250         /* Start with the main table, and see what modifiers change it */
 251         assert(config->num_tables > 0);
 252         table = &config->table[0];
 253         for (i = 1; i < config->num_tables; i++) {
 254                 struct input_key_xlate *tab = &config->table[i];
 255
 256                 if (key == tab->left_keycode || key == tab->right_keycode)
 257                         table = tab;
 258         }
 259
 260         /* Handle the lighted keys */
 261         if (!release) {
 262                 int flip = -1;
 263
 264                 switch (key) {
 265                 case KEY_SCROLLLOCK:
 266                         flip = FLAG_SCROLL_LOCK;
 267                         break;
 268                 case KEY_NUMLOCK:
 269                         flip = FLAG_NUM_LOCK;
 270                         break;
 271                 case KEY_CAPSLOCK:
 272                         flip = FLAG_CAPS_LOCK;
 273                         break;
 274                 }
 275
 276                 if (flip != -1) {
 277                         int leds = 0;
 278
 279                         config->flags ^= flip;
 280                         if (config->flags & FLAG_NUM_LOCK)
 281                                 leds |= INPUT_LED_NUM;
 282                         if (config->flags & FLAG_CAPS_LOCK)
 283                                 leds |= INPUT_LED_CAPS;
 284                         if (config->flags & FLAG_SCROLL_LOCK)
 285                                 leds |= INPUT_LED_SCROLL;
 286                         config->leds = leds;
 287                         config->leds_changed = flip;
 288
 289 #ifdef CONFIG_DM_KEYBOARD
 290                         if (ops->update_leds) {
 291                                 if (ops->update_leds(dev, config->leds))
 292                                         debug("Update keyboard's LED failed\n");
 293                         }
 294 #endif
 295                 }
 296         }
 297
 298         return table;
 299 }
 300
 301 /**
 302  * Search an int array for a key value
 303  *
 304  * @param array Array to search
 305  * @param count Number of elements in array
 306  * @param key   Key value to find
 307  * @return element where value was first found, -1 if none
 308  */
 309 static int array_search(int *array, int count, int key)
 310 {
 311         int i;
 312
 313         for (i = 0; i < count; i++) {
 314                 if (array[i] == key)
 315                         return i;
 316         }
 317
 318         return -1;
 319 }
 320
 321 /**
 322  * Sort an array so that those elements that exist in the ordering are
 323  * first in the array, and in the same order as the ordering. The algorithm
 324  * is O(count * ocount) and designed for small arrays.
 325  *
 326  * TODO: Move this to common / lib?
 327  *
 328  * @param dest          Array with elements to sort, also destination array
 329  * @param count         Number of elements to sort
 330  * @param order         Array containing ordering elements
 331  * @param ocount        Number of ordering elements
 332  * @return number of elements in dest that are in order (these will be at the
 333  *      start of dest).
 334  */
 335 static int sort_array_by_ordering(int *dest, int count, int *order,
 336                                    int ocount)
 337 {
 338         int temp[count];
 339         int dest_count;
 340         int same;       /* number of elements which are the same */
 341         int i;
 342
 343         /* setup output items, copy items to be sorted into our temp area */
 344         memcpy(temp, dest, count * sizeof(*dest));
 345         dest_count = 0;
 346
 347         /* work through the ordering, move over the elements we agree on */
 348         for (i = 0; i < ocount; i++) {
 349                 if (array_search(temp, count, order[i]) != -1)
 350                         dest[dest_count++] = order[i];
 351         }
 352         same = dest_count;
 353
 354         /* now move over the elements that are not in the ordering */
 355         for (i = 0; i < count; i++) {
 356                 if (array_search(order, ocount, temp[i]) == -1)
 357                         dest[dest_count++] = temp[i];
 358         }
 359         assert(dest_count == count);
 360         return same;
 361 }
 362
 363 /**
 364  * Check a list of key codes against the previous key scan
 365  *
 366  * Given a list of new key codes, we check how many of these are the same
 367  * as last time.
 368  *
 369  * @param config        Input state
 370  * @param keycode       List of key codes to examine
 371  * @param num_keycodes  Number of key codes
 372  * @param same          Returns number of key codes which are the same
 373  */
 374 static int input_check_keycodes(struct input_config *config,
 375                            int keycode[], int num_keycodes, int *same)
 376 {
 377         /* Select the 'plain' xlate table to start with */
 378         if (!config->num_tables) {
 379                 debug("%s: No xlate tables: cannot decode keys\n", __func__);
 380                 return -1;
 381         }
 382
 383         /* sort the keycodes into the same order as the previous ones */
 384         *same = sort_array_by_ordering(keycode, num_keycodes,
 385                         config->prev_keycodes, config->num_prev_keycodes);
 386
 387         memcpy(config->prev_keycodes, keycode, num_keycodes * sizeof(int));
 388         config->num_prev_keycodes = num_keycodes;
 389
 390         return *same != num_keycodes;
 391 }
 392
 393 /**
 394  * Checks and converts a special key code into ANSI 3.64 escape sequence.
 395  *
 396  * @param config        Input state
 397  * @param keycode       Key code to examine
 398  * @param output_ch     Buffer to place output characters into. It should
 399  *                      be at least ANSI_CHAR_MAX bytes long, to allow for
 400  *                      an ANSI sequence.
 401  * @param max_chars     Maximum number of characters to add to output_ch
 402  * @return number of characters output, if the key was converted, otherwise 0.
 403  *      This may be larger than max_chars, in which case the overflow
 404  *      characters are not output.
 405  */
 406 static int input_keycode_to_ansi364(struct input_config *config,
 407                 int keycode, char output_ch[], int max_chars)
 408 {
 409         const char *escape;
 410         int ch_count;
 411         int i;
 412
 413         for (i = ch_count = 0; i < ARRAY_SIZE(kbd_to_ansi364); i++) {
 414                 if (keycode != kbd_to_ansi364[i].kbd_scan_code)
 415                         continue;
 416                 for (escape = kbd_to_ansi364[i].escape; *escape; escape++) {
 417                         if (ch_count < max_chars)
 418                                 output_ch[ch_count] = *escape;
 419                         ch_count++;
 420                 }
 421                 return ch_count;
 422         }
 423
 424         return 0;
 425 }
 426
 427 /**
 428  * Converts and queues a list of key codes in escaped ASCII string form
 429  * Convert a list of key codes into ASCII
 430  *
 431  * You must call input_check_keycodes() before this. It turns the keycode
 432  * list into a list of ASCII characters and sends them to the input layer.
 433  *
 434  * Characters which were seen last time do not generate fresh ASCII output.
 435  * The output (calls to queue_ascii) may be longer than num_keycodes, if the
 436  * keycode contains special keys that was encoded to longer escaped sequence.
 437  *
 438  * @param config        Input state
 439  * @param keycode       List of key codes to examine
 440  * @param num_keycodes  Number of key codes
 441  * @param output_ch     Buffer to place output characters into. It should
 442  *                      be at last ANSI_CHAR_MAX * num_keycodes, to allow for
 443  *                      ANSI sequences.
 444  * @param max_chars     Maximum number of characters to add to output_ch
 445  * @param same          Number of key codes which are the same
 446  * @return number of characters written into output_ch, or -1 if we would
 447  *      exceed max_chars chars.
 448  */
 449 static int input_keycodes_to_ascii(struct input_config *config,
 450                 int keycode[], int num_keycodes, char output_ch[],
 451                 int max_chars, int same)
 452 {
 453         struct input_key_xlate *table;
 454         int ch_count = 0;
 455         int i;
 456
 457         table = &config->table[0];
 458
 459         /* deal with modifiers first */
 460         for (i = 0; i < num_keycodes; i++) {
 461                 int key = keycode[i] & KEY_MASK;
 462
 463                 if (key >= table->num_entries || table->xlate[key] == 0xff) {
 464                         table = process_modifier(config, key,
 465                                         keycode[i] & KEY_RELEASE);
 466                 }
 467         }
 468
 469         /* Start conversion by looking for the first new keycode (by same). */
 470         for (i = same; i < num_keycodes; i++) {
 471                 int key = keycode[i];
 472                 int ch;
 473
 474                 /*
 475                  * For a normal key (with an ASCII value), add it; otherwise
 476                  * translate special key to escape sequence if possible.
 477                  */
 478                 if (key < table->num_entries) {
 479                         ch = table->xlate[key];
 480                         if ((config->flags & FLAG_CAPS_LOCK) &&
 481                             ch >= 'a' && ch <= 'z')
 482                                 ch -= 'a' - 'A';
 483                         /* ban digit numbers if 'Num Lock' is not on */
 484                         if (!(config->flags & FLAG_NUM_LOCK)) {
 485                                 if (key >= KEY_KP7 && key <= KEY_KPDOT &&
 486                                     key != KEY_KPMINUS && key != KEY_KPPLUS)
 487                                         ch = 0xff;
 488                         }
 489                         if (ch_count < max_chars && ch != 0xff)
 490                                 output_ch[ch_count++] = (uchar)ch;
 491                 } else {
 492                         ch_count += input_keycode_to_ansi364(config, key,
 493                                                 output_ch, max_chars);
 494                 }
 495         }
 496
 497         if (ch_count > max_chars) {
 498                 debug("%s: Output char buffer overflow size=%d, need=%d\n",
 499                       __func__, max_chars, ch_count);
 500                 return -1;
 501         }
 502
 503         /* ok, so return keys */
 504         return ch_count;
 505 }
 506
 507 static int _input_send_keycodes(struct input_config *config, int keycode[],
 508                                 int num_keycodes, bool do_send)
 509 {
 510         char ch[num_keycodes * ANSI_CHAR_MAX];
 511         int count, i, same = 0;
 512         int is_repeat = 0;
 513         unsigned delay_ms;
 514
 515         config->modifiers = 0;
 516         if (!input_check_keycodes(config, keycode, num_keycodes, &same)) {
 517                 /*
 518                  * Same as last time - is it time for another repeat?
 519                  * TODO(sjg@chromium.org) We drop repeats here and since
 520                  * the caller may not call in again for a while, our
 521                  * auto-repeat speed is not quite correct. We should
 522                  * insert another character if we later realise that we
 523                  * have missed a repeat slot.
 524                  */
 525                 is_repeat = config->allow_repeats || (config->repeat_rate_ms &&
 526                         (int)get_timer(config->next_repeat_ms) >= 0);
 527                 if (!is_repeat)
 528                         return 0;
 529         }
 530
 531         count = input_keycodes_to_ascii(config, keycode, num_keycodes,
 532                                         ch, sizeof(ch), is_repeat ? 0 : same);
 533         if (do_send) {
 534                 for (i = 0; i < count; i++)
 535                         input_queue_ascii(config, ch[i]);
 536         }
 537         delay_ms = is_repeat ?
 538                         config->repeat_rate_ms :
 539                         config->repeat_delay_ms;
 540
 541         config->next_repeat_ms = get_timer(0) + delay_ms;
 542
 543         return count;
 544 }
 545
 546 int input_send_keycodes(struct input_config *config, int keycode[],
 547                         int num_keycodes)
 548 {
 549         return _input_send_keycodes(config, keycode, num_keycodes, true);
 550 }
 551
 552 int input_add_keycode(struct input_config *config, int new_keycode,
 553                       bool release)
 554 {
 555         int keycode[INPUT_MAX_MODIFIERS + 1];
 556         int count, i;
 557
 558         /* Add the old keycodes which are not removed by this new one */
 559         for (i = 0, count = 0; i < config->num_prev_keycodes; i++) {
 560                 int code = config->prev_keycodes[i];
 561
 562                 if (new_keycode == code) {
 563                         if (release)
 564                                 continue;
 565                         new_keycode = -1;
 566                 }
 567                 keycode[count++] = code;
 568         }
 569
 570         if (!release && new_keycode != -1)
 571                 keycode[count++] = new_keycode;
 572         debug("\ncodes for %02x/%d: ", new_keycode, release);
 573         for (i = 0; i < count; i++)
 574                 debug("%02x ", keycode[i]);
 575         debug("\n");
 576
 577         /* Don't output any ASCII characters if this is a key release */
 578         return _input_send_keycodes(config, keycode, count, !release);
 579 }
 580
 581 int input_add_table(struct input_config *config, int left_keycode,
 582                     int right_keycode, const uchar *xlate, int num_entries)
 583 {
 584         struct input_key_xlate *table;
 585
 586         if (config->num_tables == INPUT_MAX_MODIFIERS) {
 587                 debug("%s: Too many modifier tables\n", __func__);
 588                 return -1;
 589         }
 590
 591         table = &config->table[config->num_tables++];
 592         table->left_keycode = left_keycode;
 593         table->right_keycode = right_keycode;
 594         table->xlate = xlate;
 595         table->num_entries = num_entries;
 596
 597         return 0;
 598 }
 599
 600 void input_set_delays(struct input_config *config, int repeat_delay_ms,
 601                int repeat_rate_ms)
 602 {
 603         config->repeat_delay_ms = repeat_delay_ms;
 604         config->repeat_rate_ms = repeat_rate_ms;
 605 }
 606
 607 void input_allow_repeats(struct input_config *config, bool allow_repeats)
 608 {
 609         config->allow_repeats = allow_repeats;
 610 }
 611
 612 int input_leds_changed(struct input_config *config)
 613 {
 614         if (config->leds_changed)
 615                 return config->leds;
 616
 617         return -1;
 618 }
 619
 620 int input_add_tables(struct input_config *config, bool german)
 621 {
 622         struct kbd_entry *entry;
 623         int mask;
 624         int ret;
 625
 626         mask = german ? KBD_GERMAN : KBD_ENGLISH;
 627         for (entry = kbd_entry; entry->kbd_mask; entry++) {
 628                 if (!(mask & entry->kbd_mask))
 629                         continue;
 630                 ret = input_add_table(config, entry->left_keycode,
 631                                       entry->right_keycode, entry->xlate,
 632                                       entry->num_entries);
 633                 if (ret)
 634                         return ret;
 635         }
 636
 637         return 0;
 638 }
 639
 640 int input_init(struct input_config *config, int leds)
 641 {
 642         memset(config, '\0', sizeof(*config));
 643         config->leds = leds;
 644
 645         return 0;
 646 }
 647
 648 int input_stdio_register(struct stdio_dev *dev)
 649 {
 650         int error;
 651
 652         error = stdio_register(dev);
 653
 654         /* check if this is the standard input device */
 655         if (!error && strcmp(env_get("stdin"), dev->name) == 0) {
 656                 /* reassign the console */
 657                 if (OVERWRITE_CONSOLE ||
 658                                 console_assign(stdin, dev->name))
 659                         return -1;
 660         }
 661
 662         return 0;
 663 }