input: Add ANSI 3.64 escape sequence generation.
To support Non-ASCII keys (ex, Fn, PgUp/Dn, arrow keys, ...), we need to translate key code into escape sequence. (Updated by sjg@chromium.org to move away from a function to store keycodes, so we can easily record how many were sent. We now need to return this from input_send_keycodes() so we know whether keys were generated.) Signed-off-by: Hung-Te Lin <hungte@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@ti.com>
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@ -93,6 +93,22 @@ static unsigned char kbd_ctrl_xlate[] = {
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'\r', 0xff, 0xff
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};
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/*
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* Scan key code to ANSI 3.64 escape sequence table. This table is
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* incomplete in that it does not include all possible extra keys.
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*/
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static struct {
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int kbd_scan_code;
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char *escape;
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} kbd_to_ansi364[] = {
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{ KEY_UP, "\033[A"},
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{ KEY_DOWN, "\033[B"},
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{ KEY_RIGHT, "\033[C"},
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{ KEY_LEFT, "\033[D"},
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};
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/* Maximum number of output characters that an ANSI sequence expands to */
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#define ANSI_CHAR_MAX 3
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int input_queue_ascii(struct input_config *config, int ch)
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{
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@ -289,24 +305,67 @@ static int input_check_keycodes(struct input_config *config,
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}
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/**
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* Checks and converts a special key code into ANSI 3.64 escape sequence.
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*
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* @param config Input state
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* @param keycode Key code to examine
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* @param output_ch Buffer to place output characters into. It should
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* be at least ANSI_CHAR_MAX bytes long, to allow for
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* an ANSI sequence.
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* @param max_chars Maximum number of characters to add to output_ch
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* @return number of characters output, if the key was converted, otherwise 0.
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* This may be larger than max_chars, in which case the overflow
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* characters are not output.
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*/
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static int input_keycode_to_ansi364(struct input_config *config,
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int keycode, char output_ch[], int max_chars)
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{
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const char *escape;
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int ch_count;
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int i;
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for (i = ch_count = 0; i < ARRAY_SIZE(kbd_to_ansi364); i++) {
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if (keycode != kbd_to_ansi364[i].kbd_scan_code)
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continue;
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for (escape = kbd_to_ansi364[i].escape; *escape; escape++) {
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if (ch_count < max_chars)
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output_ch[ch_count] = *escape;
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ch_count++;
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}
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return ch_count;
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}
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return 0;
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}
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/**
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* Converts and queues a list of key codes in escaped ASCII string form
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* Convert a list of key codes into ASCII
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*
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* You must call input_check_keycodes() before this. It turns the keycode
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* list into a list of ASCII characters which are ready to send to the
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* input layer.
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* list into a list of ASCII characters and sends them to the input layer.
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*
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* Characters which were seen last time do not generate fresh ASCII output.
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* The output (calls to queue_ascii) may be longer than num_keycodes, if the
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* keycode contains special keys that was encoded to longer escaped sequence.
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*
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* @param config Input state
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* @param keycode List of key codes to examine
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* @param num_keycodes Number of key codes
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* @param output_ch Buffer to place output characters into. It should
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* be at last ANSI_CHAR_MAX * num_keycodes, to allow for
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* ANSI sequences.
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* @param max_chars Maximum number of characters to add to output_ch
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* @param same Number of key codes which are the same
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* @return number of characters written into output_ch, or -1 if we would
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* exceed max_chars chars.
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*/
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static int input_keycodes_to_ascii(struct input_config *config,
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int keycode[], int num_keycodes, char output_ch[], int same)
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int keycode[], int num_keycodes, char output_ch[],
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int max_chars, int same)
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{
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struct input_key_xlate *table;
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int ch_count;
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int ch_count = 0;
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int i;
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table = &config->table[0];
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@ -321,19 +380,31 @@ static int input_keycodes_to_ascii(struct input_config *config,
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}
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}
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/* now find normal keys */
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for (i = ch_count = 0; i < num_keycodes; i++) {
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/* Start conversion by looking for the first new keycode (by same). */
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for (i = same; i < num_keycodes; i++) {
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int key = keycode[i];
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int ch = (key < table->num_entries) ? table->xlate[key] : 0xff;
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if (key < table->num_entries && i >= same) {
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int ch = table->xlate[key];
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/* If a normal key with an ASCII value, add it! */
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if (ch != 0xff)
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output_ch[ch_count++] = (uchar)ch;
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/*
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* For a normal key (with an ASCII value), add it; otherwise
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* translate special key to escape sequence if possible.
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*/
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if (ch != 0xff) {
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if (ch_count < max_chars)
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output_ch[ch_count] = (uchar)ch;
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ch_count++;
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} else {
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ch_count += input_keycode_to_ansi364(config, key,
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output_ch, max_chars);
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}
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}
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if (ch_count > max_chars) {
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debug("%s: Output char buffer overflow size=%d, need=%d\n",
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__func__, max_chars, ch_count);
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return -1;
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}
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/* ok, so return keys */
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return ch_count;
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}
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@ -341,7 +412,7 @@ static int input_keycodes_to_ascii(struct input_config *config,
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int input_send_keycodes(struct input_config *config,
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int keycode[], int num_keycodes)
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{
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char ch[num_keycodes];
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char ch[num_keycodes * ANSI_CHAR_MAX];
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int count, i, same = 0;
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int is_repeat = 0;
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unsigned delay_ms;
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@ -363,7 +434,7 @@ int input_send_keycodes(struct input_config *config,
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}
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count = input_keycodes_to_ascii(config, keycode, num_keycodes,
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ch, is_repeat ? 0 : same);
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ch, sizeof(ch), is_repeat ? 0 : same);
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for (i = 0; i < count; i++)
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input_queue_ascii(config, ch[i]);
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delay_ms = is_repeat ?
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@ -371,7 +442,8 @@ int input_send_keycodes(struct input_config *config,
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config->repeat_delay_ms;
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config->next_repeat_ms = get_timer(0) + delay_ms;
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return 0;
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return count;
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}
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int input_add_table(struct input_config *config, int left_keycode,
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@ -84,6 +84,8 @@ struct stdio_dev;
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* @param config Input state
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* @param keycode List of key codes to examine
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* @param num_keycodes Number of key codes
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* @return number of ascii characters sent, or 0 if none, or -1 for an
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* internal error
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*/
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int input_send_keycodes(struct input_config *config, int keycode[], int count);
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