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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Translate key codes into ASCII
4  *
5  * Copyright (c) 2011 The Chromium OS Authors.
6  * (C) Copyright 2004 DENX Software Engineering, Wolfgang Denk, wd@denx.de
7  */
8 
9 #include <common.h>
10 #include <console.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <stdio_dev.h>
14 #include <input.h>
15 #ifdef CONFIG_DM_KEYBOARD
16 #include <keyboard.h>
17 #endif
18 #include <linux/input.h>
19 
20 enum {
21 	/* These correspond to the lights on the keyboard */
22 	FLAG_SCROLL_LOCK	= 1 << 0,
23 	FLAG_NUM_LOCK		= 1 << 1,
24 	FLAG_CAPS_LOCK		= 1 << 2,
25 
26 	/* Special flag ORed with key code to indicate release */
27 	KEY_RELEASE		= 1 << 15,
28 	KEY_MASK		= 0xfff,
29 };
30 
31 /*
32  * These takes map key codes to ASCII. 0xff means no key, or special key.
33  * Three tables are provided - one for plain keys, one for when the shift
34  * 'modifier' key is pressed and one for when the ctrl modifier key is
35  * pressed.
36  */
37 static const uchar kbd_plain_xlate[] = {
38 	0xff, 0x1b, '1',  '2',  '3',  '4',  '5',  '6',
39 	'7',  '8',  '9',  '0',  '-',  '=', '\b', '\t',	/* 0x00 - 0x0f */
40 	'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',
41 	'o',  'p',  '[',  ']', '\r', 0xff,  'a',  's',  /* 0x10 - 0x1f */
42 	'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',
43 	'\'',  '`', 0xff, '\\', 'z',  'x',  'c',  'v',	/* 0x20 - 0x2f */
44 	'b',  'n',  'm',  ',' ,  '.', '/', 0xff, 0xff, 0xff,
45 	' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x30 - 0x3f */
46 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7',
47 	'8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',	/* 0x40 - 0x4f */
48 	'2',  '3',  '0',  '.', 0xff, 0xff, 0xff, 0xff,
49 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x50 - 0x5F */
50 	'\r', 0xff, '/',  '*',
51 };
52 
53 static unsigned char kbd_shift_xlate[] = {
54 	0xff, 0x1b, '!', '@', '#', '$', '%', '^',
55 	'&', '*', '(', ')', '_', '+', '\b', '\t',	/* 0x00 - 0x0f */
56 	'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
57 	'O', 'P', '{', '}', '\r', 0xff, 'A', 'S',	/* 0x10 - 0x1f */
58 	'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
59 	'"', '~', 0xff, '|', 'Z', 'X', 'C', 'V',	/* 0x20 - 0x2f */
60 	'B', 'N', 'M', '<', '>', '?', 0xff, 0xff, 0xff,
61 	' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x30 - 0x3f */
62 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
63 	'8', '9', '-', '4', '5', '6', '+', '1',	/* 0x40 - 0x4f */
64 	'2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff, 0xff,
65 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x50 - 0x5F */
66 	'\r', 0xff, '/',  '*',
67 };
68 
69 static unsigned char kbd_ctrl_xlate[] = {
70 	0xff, 0x1b, '1', 0x00, '3', '4', '5', 0x1E,
71 	'7', '8', '9', '0', 0x1F, '=', '\b', '\t',	/* 0x00 - 0x0f */
72 	0x11, 0x17, 0x05, 0x12, 0x14, 0x19, 0x15, 0x09,
73 	0x0f, 0x10, 0x1b, 0x1d, '\n', 0xff, 0x01, 0x13,	/* 0x10 - 0x1f */
74 	0x04, 0x06, 0x08, 0x09, 0x0a, 0x0b, 0x0c, ';',
75 	'\'', '~', 0x00, 0x1c, 0x1a, 0x18, 0x03, 0x16,	/* 0x20 - 0x2f */
76 	0x02, 0x0e, 0x0d, '<', '>', '?', 0xff, 0xff,
77 	0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x30 - 0x3f */
78 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, '7',
79 	'8', '9', '-', '4', '5', '6', '+', '1',		/* 0x40 - 0x4f */
80 	'2', '3', '0', '.', 0xff, 0xff, 0xff, 0xff,
81 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 0x50 - 0x5F */
82 	'\r', 0xff, '/',  '*',
83 };
84 
85 /*
86  * German keymap. Special letters are mapped according to code page 437.
87  */
88 static const uchar kbd_plain_xlate_german[] = {
89 	0xff, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
90 	 '7',  '8',  '9',  '0', 0xe1, '\'', 0x08, '\t', /* scan 08-0F */
91 	 'q',  'w',  'e',  'r',  't',  'z',  'u',  'i', /* scan 10-17 */
92 	 'o',  'p', 0x81,  '+', '\r', 0xff,  'a',  's', /* scan 18-1F */
93 	 'd',  'f',  'g',  'h',  'j',  'k',  'l', 0x94, /* scan 20-27 */
94 	0x84,  '^', 0xff,  '#',  'y',  'x',  'c',  'v', /* scan 28-2F */
95 	 'b',  'n',  'm',  ',',  '.',  '-', 0xff,  '*', /* scan 30-37 */
96 	 ' ',  ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
97 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7', /* scan 40-47 */
98 	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
99 	 '2',  '3',  '0',  ',', 0xff, 0xff,  '<', 0xff, /* scan 50-57 */
100 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
101 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
102 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
103 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
104 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
105 	'\r', 0xff,  '/',  '*',
106 };
107 
108 static unsigned char kbd_shift_xlate_german[] = {
109 	   0xff, 0x1b,  '!',  '"', 0x15,  '$',  '%',  '&', /* scan 00-07 */
110 	 '/',  '(',  ')',  '=',  '?',  '`', 0x08, '\t', /* scan 08-0F */
111 	 'Q',  'W',  'E',  'R',  'T',  'Z',  'U',  'I', /* scan 10-17 */
112 	 'O',  'P', 0x9a,  '*', '\r', 0xff,  'A',  'S', /* scan 18-1F */
113 	 'D',  'F',  'G',  'H',  'J',  'K',  'L', 0x99, /* scan 20-27 */
114 	0x8e, 0xf8, 0xff, '\'',  'Y',  'X',  'C',  'V', /* scan 28-2F */
115 	 'B',  'N',  'M',  ';',  ':',  '_', 0xff,  '*', /* scan 30-37 */
116 	 ' ',  ' ', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
117 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '7', /* scan 40-47 */
118 	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
119 	 '2',  '3',  '0',  ',', 0xff, 0xff,  '>', 0xff, /* scan 50-57 */
120 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
121 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
122 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
123 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
124 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
125 	'\r', 0xff,  '/',  '*',
126 };
127 
128 static unsigned char kbd_right_alt_xlate_german[] = {
129 	0xff, 0xff, 0xff, 0xfd, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
130 	 '{',  '[',  ']',  '}', '\\', 0xff, 0xff, 0xff, /* scan 08-0F */
131 	 '@', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 10-17 */
132 	0xff, 0xff, 0xff,  '~', 0xff, 0xff, 0xff, 0xff, /* scan 18-1F */
133 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 20-27 */
134 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 28-2F */
135 	0xff, 0xff, 0xe6, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 30-37 */
136 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
137 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 40-47 */
138 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
139 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '|', 0xff, /* scan 50-57 */
140 };
141 
142 enum kbd_mask {
143 	KBD_ENGLISH	= 1 << 0,
144 	KBD_GERMAN	= 1 << 1,
145 };
146 
147 static struct kbd_entry {
148 	int kbd_mask;		/* Which languages this is for */
149 	int left_keycode;	/* Left keycode to select this map */
150 	int right_keycode;	/* Right keycode to select this map */
151 	const uchar *xlate;	/* Ascii code for each keycode */
152 	int num_entries;	/* Number of entries in xlate */
153 } kbd_entry[] = {
154 	{ KBD_ENGLISH, -1, -1,
155 		kbd_plain_xlate, ARRAY_SIZE(kbd_plain_xlate) },
156 	{ KBD_GERMAN, -1, -1,
157 		kbd_plain_xlate_german, ARRAY_SIZE(kbd_plain_xlate_german) },
158 	{ KBD_ENGLISH, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
159 		kbd_shift_xlate, ARRAY_SIZE(kbd_shift_xlate) },
160 	{ KBD_GERMAN, KEY_LEFTSHIFT, KEY_RIGHTSHIFT,
161 		kbd_shift_xlate_german, ARRAY_SIZE(kbd_shift_xlate_german) },
162 	{ KBD_ENGLISH | KBD_GERMAN, KEY_LEFTCTRL, KEY_RIGHTCTRL,
163 		kbd_ctrl_xlate, ARRAY_SIZE(kbd_ctrl_xlate) },
164 	{ KBD_GERMAN, -1, KEY_RIGHTALT,
165 		kbd_right_alt_xlate_german,
166 		ARRAY_SIZE(kbd_right_alt_xlate_german) },
167 	{},
168 };
169 
170 /*
171  * Scan key code to ANSI 3.64 escape sequence table.  This table is
172  * incomplete in that it does not include all possible extra keys.
173  */
174 static struct {
175 	int kbd_scan_code;
176 	char *escape;
177 } kbd_to_ansi364[] = {
178 	{ KEY_UP, "\033[A"},
179 	{ KEY_DOWN, "\033[B"},
180 	{ KEY_RIGHT, "\033[C"},
181 	{ KEY_LEFT, "\033[D"},
182 };
183 
184 /* Maximum number of output characters that an ANSI sequence expands to */
185 #define ANSI_CHAR_MAX	3
186 
input_queue_ascii(struct input_config * config,int ch)187 static int input_queue_ascii(struct input_config *config, int ch)
188 {
189 	if (config->fifo_in + 1 == INPUT_BUFFER_LEN) {
190 		if (!config->fifo_out)
191 			return -1; /* buffer full */
192 		else
193 			config->fifo_in = 0;
194 	} else {
195 		if (config->fifo_in + 1 == config->fifo_out)
196 			return -1; /* buffer full */
197 		config->fifo_in++;
198 	}
199 	debug(" {%02x} ", ch);
200 	config->fifo[config->fifo_in] = (uchar)ch;
201 
202 	return 0;
203 }
204 
input_tstc(struct input_config * config)205 int input_tstc(struct input_config *config)
206 {
207 	if (config->fifo_in == config->fifo_out && config->read_keys) {
208 		if (!(*config->read_keys)(config))
209 			return 0;
210 	}
211 	return config->fifo_in != config->fifo_out;
212 }
213 
input_getc(struct input_config * config)214 int input_getc(struct input_config *config)
215 {
216 	int err = 0;
217 
218 	while (config->fifo_in == config->fifo_out) {
219 		if (config->read_keys)
220 			err = (*config->read_keys)(config);
221 		if (err)
222 			return -1;
223 	}
224 
225 	if (++config->fifo_out == INPUT_BUFFER_LEN)
226 		config->fifo_out = 0;
227 
228 	return config->fifo[config->fifo_out];
229 }
230 
231 /**
232  * Process a modifier/special key press or release and decide which key
233  * translation array should be used as a result.
234  *
235  * TODO: Should keep track of modifier press/release
236  *
237  * @param config	Input state
238  * @param key		Key code to process
239  * @param release	0 if a press, 1 if a release
240  * @return pointer to keycode->ascii translation table that should be used
241  */
process_modifier(struct input_config * config,int key,int release)242 static struct input_key_xlate *process_modifier(struct input_config *config,
243 						int key, int release)
244 {
245 #ifdef CONFIG_DM_KEYBOARD
246 	struct udevice *dev = config->dev;
247 	struct keyboard_ops *ops = keyboard_get_ops(dev);
248 #endif
249 	struct input_key_xlate *table;
250 	int i;
251 
252 	/* Start with the main table, and see what modifiers change it */
253 	assert(config->num_tables > 0);
254 	table = &config->table[0];
255 	for (i = 1; i < config->num_tables; i++) {
256 		struct input_key_xlate *tab = &config->table[i];
257 
258 		if (key == tab->left_keycode || key == tab->right_keycode)
259 			table = tab;
260 	}
261 
262 	/* Handle the lighted keys */
263 	if (!release) {
264 		int flip = -1;
265 
266 		switch (key) {
267 		case KEY_SCROLLLOCK:
268 			flip = FLAG_SCROLL_LOCK;
269 			break;
270 		case KEY_NUMLOCK:
271 			flip = FLAG_NUM_LOCK;
272 			break;
273 		case KEY_CAPSLOCK:
274 			flip = FLAG_CAPS_LOCK;
275 			break;
276 		}
277 
278 		if (flip != -1) {
279 			int leds = 0;
280 
281 			config->flags ^= flip;
282 			if (config->flags & FLAG_NUM_LOCK)
283 				leds |= INPUT_LED_NUM;
284 			if (config->flags & FLAG_CAPS_LOCK)
285 				leds |= INPUT_LED_CAPS;
286 			if (config->flags & FLAG_SCROLL_LOCK)
287 				leds |= INPUT_LED_SCROLL;
288 			config->leds = leds;
289 			config->leds_changed = flip;
290 
291 #ifdef CONFIG_DM_KEYBOARD
292 			if (ops->update_leds) {
293 				if (ops->update_leds(dev, config->leds))
294 					debug("Update keyboard's LED failed\n");
295 			}
296 #endif
297 		}
298 	}
299 
300 	return table;
301 }
302 
303 /**
304  * Search an int array for a key value
305  *
306  * @param array	Array to search
307  * @param count	Number of elements in array
308  * @param key	Key value to find
309  * @return element where value was first found, -1 if none
310  */
array_search(int * array,int count,int key)311 static int array_search(int *array, int count, int key)
312 {
313 	int i;
314 
315 	for (i = 0; i < count; i++) {
316 		if (array[i] == key)
317 			return i;
318 	}
319 
320 	return -1;
321 }
322 
323 /**
324  * Sort an array so that those elements that exist in the ordering are
325  * first in the array, and in the same order as the ordering. The algorithm
326  * is O(count * ocount) and designed for small arrays.
327  *
328  * TODO: Move this to common / lib?
329  *
330  * @param dest		Array with elements to sort, also destination array
331  * @param count		Number of elements to sort
332  * @param order		Array containing ordering elements
333  * @param ocount	Number of ordering elements
334  * @return number of elements in dest that are in order (these will be at the
335  *	start of dest).
336  */
sort_array_by_ordering(int * dest,int count,int * order,int ocount)337 static int sort_array_by_ordering(int *dest, int count, int *order,
338 				   int ocount)
339 {
340 	int temp[count];
341 	int dest_count;
342 	int same;	/* number of elements which are the same */
343 	int i;
344 
345 	/* setup output items, copy items to be sorted into our temp area */
346 	memcpy(temp, dest, count * sizeof(*dest));
347 	dest_count = 0;
348 
349 	/* work through the ordering, move over the elements we agree on */
350 	for (i = 0; i < ocount; i++) {
351 		if (array_search(temp, count, order[i]) != -1)
352 			dest[dest_count++] = order[i];
353 	}
354 	same = dest_count;
355 
356 	/* now move over the elements that are not in the ordering */
357 	for (i = 0; i < count; i++) {
358 		if (array_search(order, ocount, temp[i]) == -1)
359 			dest[dest_count++] = temp[i];
360 	}
361 	assert(dest_count == count);
362 	return same;
363 }
364 
365 /**
366  * Check a list of key codes against the previous key scan
367  *
368  * Given a list of new key codes, we check how many of these are the same
369  * as last time.
370  *
371  * @param config	Input state
372  * @param keycode	List of key codes to examine
373  * @param num_keycodes	Number of key codes
374  * @param same		Returns number of key codes which are the same
375  */
input_check_keycodes(struct input_config * config,int keycode[],int num_keycodes,int * same)376 static int input_check_keycodes(struct input_config *config,
377 			   int keycode[], int num_keycodes, int *same)
378 {
379 	/* Select the 'plain' xlate table to start with */
380 	if (!config->num_tables) {
381 		debug("%s: No xlate tables: cannot decode keys\n", __func__);
382 		return -1;
383 	}
384 
385 	/* sort the keycodes into the same order as the previous ones */
386 	*same = sort_array_by_ordering(keycode, num_keycodes,
387 			config->prev_keycodes, config->num_prev_keycodes);
388 
389 	memcpy(config->prev_keycodes, keycode, num_keycodes * sizeof(int));
390 	config->num_prev_keycodes = num_keycodes;
391 
392 	return *same != num_keycodes;
393 }
394 
395 /**
396  * Checks and converts a special key code into ANSI 3.64 escape sequence.
397  *
398  * @param config	Input state
399  * @param keycode	Key code to examine
400  * @param output_ch	Buffer to place output characters into. It should
401  *			be at least ANSI_CHAR_MAX bytes long, to allow for
402  *			an ANSI sequence.
403  * @param max_chars	Maximum number of characters to add to output_ch
404  * @return number of characters output, if the key was converted, otherwise 0.
405  *	This may be larger than max_chars, in which case the overflow
406  *	characters are not output.
407  */
input_keycode_to_ansi364(struct input_config * config,int keycode,char output_ch[],int max_chars)408 static int input_keycode_to_ansi364(struct input_config *config,
409 		int keycode, char output_ch[], int max_chars)
410 {
411 	const char *escape;
412 	int ch_count;
413 	int i;
414 
415 	for (i = ch_count = 0; i < ARRAY_SIZE(kbd_to_ansi364); i++) {
416 		if (keycode != kbd_to_ansi364[i].kbd_scan_code)
417 			continue;
418 		for (escape = kbd_to_ansi364[i].escape; *escape; escape++) {
419 			if (ch_count < max_chars)
420 				output_ch[ch_count] = *escape;
421 			ch_count++;
422 		}
423 		return ch_count;
424 	}
425 
426 	return 0;
427 }
428 
429 /**
430  * Converts and queues a list of key codes in escaped ASCII string form
431  * Convert a list of key codes into ASCII
432  *
433  * You must call input_check_keycodes() before this. It turns the keycode
434  * list into a list of ASCII characters and sends them to the input layer.
435  *
436  * Characters which were seen last time do not generate fresh ASCII output.
437  * The output (calls to queue_ascii) may be longer than num_keycodes, if the
438  * keycode contains special keys that was encoded to longer escaped sequence.
439  *
440  * @param config	Input state
441  * @param keycode	List of key codes to examine
442  * @param num_keycodes	Number of key codes
443  * @param output_ch	Buffer to place output characters into. It should
444  *			be at last ANSI_CHAR_MAX * num_keycodes, to allow for
445  *			ANSI sequences.
446  * @param max_chars	Maximum number of characters to add to output_ch
447  * @param same		Number of key codes which are the same
448  * @return number of characters written into output_ch, or -1 if we would
449  *	exceed max_chars chars.
450  */
input_keycodes_to_ascii(struct input_config * config,int keycode[],int num_keycodes,char output_ch[],int max_chars,int same)451 static int input_keycodes_to_ascii(struct input_config *config,
452 		int keycode[], int num_keycodes, char output_ch[],
453 		int max_chars, int same)
454 {
455 	struct input_key_xlate *table;
456 	int ch_count = 0;
457 	int i;
458 
459 	table = &config->table[0];
460 
461 	/* deal with modifiers first */
462 	for (i = 0; i < num_keycodes; i++) {
463 		int key = keycode[i] & KEY_MASK;
464 
465 		if (key >= table->num_entries || table->xlate[key] == 0xff) {
466 			table = process_modifier(config, key,
467 					keycode[i] & KEY_RELEASE);
468 		}
469 	}
470 
471 	/* Start conversion by looking for the first new keycode (by same). */
472 	for (i = same; i < num_keycodes; i++) {
473 		int key = keycode[i];
474 		int ch;
475 
476 		/*
477 		 * For a normal key (with an ASCII value), add it; otherwise
478 		 * translate special key to escape sequence if possible.
479 		 */
480 		if (key < table->num_entries) {
481 			ch = table->xlate[key];
482 			if ((config->flags & FLAG_CAPS_LOCK) &&
483 			    ch >= 'a' && ch <= 'z')
484 				ch -= 'a' - 'A';
485 			/* ban digit numbers if 'Num Lock' is not on */
486 			if (!(config->flags & FLAG_NUM_LOCK)) {
487 				if (key >= KEY_KP7 && key <= KEY_KPDOT &&
488 				    key != KEY_KPMINUS && key != KEY_KPPLUS)
489 					ch = 0xff;
490 			}
491 			if (ch_count < max_chars && ch != 0xff)
492 				output_ch[ch_count++] = (uchar)ch;
493 		} else {
494 			ch_count += input_keycode_to_ansi364(config, key,
495 						output_ch, max_chars);
496 		}
497 	}
498 
499 	if (ch_count > max_chars) {
500 		debug("%s: Output char buffer overflow size=%d, need=%d\n",
501 		      __func__, max_chars, ch_count);
502 		return -1;
503 	}
504 
505 	/* ok, so return keys */
506 	return ch_count;
507 }
508 
_input_send_keycodes(struct input_config * config,int keycode[],int num_keycodes,bool do_send)509 static int _input_send_keycodes(struct input_config *config, int keycode[],
510 				int num_keycodes, bool do_send)
511 {
512 	char ch[num_keycodes * ANSI_CHAR_MAX];
513 	int count, i, same = 0;
514 	int is_repeat = 0;
515 	unsigned delay_ms;
516 
517 	config->modifiers = 0;
518 	if (!input_check_keycodes(config, keycode, num_keycodes, &same)) {
519 		/*
520 		 * Same as last time - is it time for another repeat?
521 		 * TODO(sjg@chromium.org) We drop repeats here and since
522 		 * the caller may not call in again for a while, our
523 		 * auto-repeat speed is not quite correct. We should
524 		 * insert another character if we later realise that we
525 		 * have missed a repeat slot.
526 		 */
527 		is_repeat = config->allow_repeats || (config->repeat_rate_ms &&
528 			(int)get_timer(config->next_repeat_ms) >= 0);
529 		if (!is_repeat)
530 			return 0;
531 	}
532 
533 	count = input_keycodes_to_ascii(config, keycode, num_keycodes,
534 					ch, sizeof(ch), is_repeat ? 0 : same);
535 	if (do_send) {
536 		for (i = 0; i < count; i++)
537 			input_queue_ascii(config, ch[i]);
538 	}
539 	delay_ms = is_repeat ?
540 			config->repeat_rate_ms :
541 			config->repeat_delay_ms;
542 
543 	config->next_repeat_ms = get_timer(0) + delay_ms;
544 
545 	return count;
546 }
547 
input_send_keycodes(struct input_config * config,int keycode[],int num_keycodes)548 int input_send_keycodes(struct input_config *config, int keycode[],
549 			int num_keycodes)
550 {
551 	return _input_send_keycodes(config, keycode, num_keycodes, true);
552 }
553 
input_add_keycode(struct input_config * config,int new_keycode,bool release)554 int input_add_keycode(struct input_config *config, int new_keycode,
555 		      bool release)
556 {
557 	int keycode[INPUT_MAX_MODIFIERS + 1];
558 	int count, i;
559 
560 	/* Add the old keycodes which are not removed by this new one */
561 	for (i = 0, count = 0; i < config->num_prev_keycodes; i++) {
562 		int code = config->prev_keycodes[i];
563 
564 		if (new_keycode == code) {
565 			if (release)
566 				continue;
567 			new_keycode = -1;
568 		}
569 		keycode[count++] = code;
570 	}
571 
572 	if (!release && new_keycode != -1)
573 		keycode[count++] = new_keycode;
574 	debug("\ncodes for %02x/%d: ", new_keycode, release);
575 	for (i = 0; i < count; i++)
576 		debug("%02x ", keycode[i]);
577 	debug("\n");
578 
579 	/* Don't output any ASCII characters if this is a key release */
580 	return _input_send_keycodes(config, keycode, count, !release);
581 }
582 
input_add_table(struct input_config * config,int left_keycode,int right_keycode,const uchar * xlate,int num_entries)583 int input_add_table(struct input_config *config, int left_keycode,
584 		    int right_keycode, const uchar *xlate, int num_entries)
585 {
586 	struct input_key_xlate *table;
587 
588 	if (config->num_tables == INPUT_MAX_MODIFIERS) {
589 		debug("%s: Too many modifier tables\n", __func__);
590 		return -1;
591 	}
592 
593 	table = &config->table[config->num_tables++];
594 	table->left_keycode = left_keycode;
595 	table->right_keycode = right_keycode;
596 	table->xlate = xlate;
597 	table->num_entries = num_entries;
598 
599 	return 0;
600 }
601 
input_set_delays(struct input_config * config,int repeat_delay_ms,int repeat_rate_ms)602 void input_set_delays(struct input_config *config, int repeat_delay_ms,
603 	       int repeat_rate_ms)
604 {
605 	config->repeat_delay_ms = repeat_delay_ms;
606 	config->repeat_rate_ms = repeat_rate_ms;
607 }
608 
input_allow_repeats(struct input_config * config,bool allow_repeats)609 void input_allow_repeats(struct input_config *config, bool allow_repeats)
610 {
611 	config->allow_repeats = allow_repeats;
612 }
613 
input_leds_changed(struct input_config * config)614 int input_leds_changed(struct input_config *config)
615 {
616 	if (config->leds_changed)
617 		return config->leds;
618 
619 	return -1;
620 }
621 
input_add_tables(struct input_config * config,bool german)622 int input_add_tables(struct input_config *config, bool german)
623 {
624 	struct kbd_entry *entry;
625 	int mask;
626 	int ret;
627 
628 	mask = german ? KBD_GERMAN : KBD_ENGLISH;
629 	for (entry = kbd_entry; entry->kbd_mask; entry++) {
630 		if (!(mask & entry->kbd_mask))
631 			continue;
632 		ret = input_add_table(config, entry->left_keycode,
633 				      entry->right_keycode, entry->xlate,
634 				      entry->num_entries);
635 		if (ret)
636 			return ret;
637 	}
638 
639 	return 0;
640 }
641 
input_init(struct input_config * config,int leds)642 int input_init(struct input_config *config, int leds)
643 {
644 	memset(config, '\0', sizeof(*config));
645 	config->leds = leds;
646 
647 	return 0;
648 }
649 
input_stdio_register(struct stdio_dev * dev)650 int input_stdio_register(struct stdio_dev *dev)
651 {
652 	int error;
653 
654 	error = stdio_register(dev);
655 
656 	/* check if this is the standard input device */
657 	if (!error && strcmp(env_get("stdin"), dev->name) == 0) {
658 		/* reassign the console */
659 		if (OVERWRITE_CONSOLE ||
660 				console_assign(stdin, dev->name))
661 			return -1;
662 	}
663 
664 	return 0;
665 }
666