From: Hung-Te Lin hungte@chromium.org
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 --- drivers/input/input.c | 102 +++++++++++++++++++++++++++++++++++++++++------- include/input.h | 2 + 2 files changed, 89 insertions(+), 15 deletions(-)
diff --git a/drivers/input/input.c b/drivers/input/input.c index 5b2b4b0..9800667 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -93,6 +93,22 @@ static unsigned char kbd_ctrl_xlate[] = { '\r', 0xff, 0xff };
+/* + * Scan key code to ANSI 3.64 escape sequence table. This table is + * incomplete in that it does not include all possible extra keys. + */ +static struct { + int kbd_scan_code; + char *escape; +} kbd_to_ansi364[] = { + { KEY_UP, "\033[A"}, + { KEY_DOWN, "\033[B"}, + { KEY_RIGHT, "\033[C"}, + { KEY_LEFT, "\033[D"}, +}; + +/* Maximum number of output characters that an ANSI sequence expands to */ +#define ANSI_CHAR_MAX 3
int input_queue_ascii(struct input_config *config, int ch) { @@ -289,24 +305,67 @@ static int input_check_keycodes(struct input_config *config, }
/** + * Checks and converts a special key code into ANSI 3.64 escape sequence. + * + * @param config Input state + * @param keycode Key code to examine + * @param output_ch Buffer to place output characters into. It should + * be at least ANSI_CHAR_MAX bytes long, to allow for + * an ANSI sequence. + * @param max_chars Maximum number of characters to add to output_ch + * @return number of characters output, if the key was converted, otherwise 0. + * This may be larger than max_chars, in which case the overflow + * characters are not output. + */ +static int input_keycode_to_ansi364(struct input_config *config, + int keycode, char output_ch[], int max_chars) +{ + const char *escape; + int ch_count; + int i; + + for (i = ch_count = 0; i < ARRAY_SIZE(kbd_to_ansi364); i++) { + if (keycode != kbd_to_ansi364[i].kbd_scan_code) + continue; + for (escape = kbd_to_ansi364[i].escape; *escape; escape++) { + if (ch_count < max_chars) + output_ch[ch_count] = *escape; + ch_count++; + } + return ch_count; + } + + return 0; +} + +/** + * Converts and queues a list of key codes in escaped ASCII string form * Convert a list of key codes into ASCII * * You must call input_check_keycodes() before this. It turns the keycode - * list into a list of ASCII characters which are ready to send to the - * input layer. + * list into a list of ASCII characters and sends them to the input layer. * * Characters which were seen last time do not generate fresh ASCII output. + * The output (calls to queue_ascii) may be longer than num_keycodes, if the + * keycode contains special keys that was encoded to longer escaped sequence. * * @param config Input state * @param keycode List of key codes to examine * @param num_keycodes Number of key codes + * @param output_ch Buffer to place output characters into. It should + * be at last ANSI_CHAR_MAX * num_keycodes, to allow for + * ANSI sequences. + * @param max_chars Maximum number of characters to add to output_ch * @param same Number of key codes which are the same + * @return number of characters written into output_ch, or -1 if we would + * exceed max_chars chars. */ static int input_keycodes_to_ascii(struct input_config *config, - int keycode[], int num_keycodes, char output_ch[], int same) + int keycode[], int num_keycodes, char output_ch[], + int max_chars, int same) { struct input_key_xlate *table; - int ch_count; + int ch_count = 0; int i;
table = &config->table[0]; @@ -321,19 +380,31 @@ static int input_keycodes_to_ascii(struct input_config *config, } }
- /* now find normal keys */ - for (i = ch_count = 0; i < num_keycodes; i++) { + /* Start conversion by looking for the first new keycode (by same). */ + for (i = same; i < num_keycodes; i++) { int key = keycode[i]; + int ch = (key < table->num_entries) ? table->xlate[key] : 0xff;
- if (key < table->num_entries && i >= same) { - int ch = table->xlate[key]; - - /* If a normal key with an ASCII value, add it! */ - if (ch != 0xff) - output_ch[ch_count++] = (uchar)ch; + /* + * For a normal key (with an ASCII value), add it; otherwise + * translate special key to escape sequence if possible. + */ + if (ch != 0xff) { + if (ch_count < max_chars) + output_ch[ch_count] = (uchar)ch; + ch_count++; + } else { + ch_count += input_keycode_to_ansi364(config, key, + output_ch, max_chars); } }
+ if (ch_count > max_chars) { + debug("%s: Output char buffer overflow size=%d, need=%d\n", + __func__, max_chars, ch_count); + return -1; + } + /* ok, so return keys */ return ch_count; } @@ -341,7 +412,7 @@ static int input_keycodes_to_ascii(struct input_config *config, int input_send_keycodes(struct input_config *config, int keycode[], int num_keycodes) { - char ch[num_keycodes]; + char ch[num_keycodes * ANSI_CHAR_MAX]; int count, i, same = 0; int is_repeat = 0; unsigned delay_ms; @@ -363,7 +434,7 @@ int input_send_keycodes(struct input_config *config, }
count = input_keycodes_to_ascii(config, keycode, num_keycodes, - ch, is_repeat ? 0 : same); + ch, sizeof(ch), is_repeat ? 0 : same); for (i = 0; i < count; i++) input_queue_ascii(config, ch[i]); delay_ms = is_repeat ? @@ -371,7 +442,8 @@ int input_send_keycodes(struct input_config *config, config->repeat_delay_ms;
config->next_repeat_ms = get_timer(0) + delay_ms; - return 0; + + return count; }
int input_add_table(struct input_config *config, int left_keycode, diff --git a/include/input.h b/include/input.h index 0f4acb2..e90bb0b 100644 --- a/include/input.h +++ b/include/input.h @@ -84,6 +84,8 @@ struct stdio_dev; * @param config Input state * @param keycode List of key codes to examine * @param num_keycodes Number of key codes + * @return number of ascii characters sent, or 0 if none, or -1 for an + * internal error */ int input_send_keycodes(struct input_config *config, int keycode[], int count);