u-boot/include/input.h
Bin Meng 377a069643 input: Change LED state bits to conform i8042 compatible keyboard
When sending LED update command to an i8042 compatible keyboard,
bit1 is 'Num Lock' and bit2 is 'Caps Lock' in the data byte. But
input library defines bit1 as 'Caps Lock' and bit2 as 'Num Lock'.
This causes a wrong LED to be set on an i8042 compatible keyboard.
Change the LED state bits to be i8042 compatible, and change the
keyboard flags as well.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-11-19 20:13:42 -07:00

203 lines
6.1 KiB
C

/*
* Keyboard input helper functions (too small to be called a layer)
*
* Copyright (c) 2011 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _INPUT_H
#define _INPUT_H
enum {
INPUT_MAX_MODIFIERS = 4,
INPUT_BUFFER_LEN = 16,
};
enum {
/* Keyboard LEDs */
INPUT_LED_SCROLL = 1 << 0,
INPUT_LED_NUM = 1 << 1,
INPUT_LED_CAPS = 1 << 2,
};
/*
* This table translates key codes to ASCII. Most of the entries are ASCII
* codes, but entries after KEY_FIRST_MOD indicate that this key is a
* modifier key, like shift, ctrl. KEY_FIRST_MOD + MOD_SHIFT is the shift
* key, for example.
*/
struct input_key_xlate {
/* keycode of the modifiers which select this table, -1 if none */
int left_keycode;
int right_keycode;
const uchar *xlate; /* keycode to ASCII table */
int num_entries; /* number of entries in this table */
};
struct input_config {
struct udevice *dev;
uchar fifo[INPUT_BUFFER_LEN];
int fifo_in, fifo_out;
/* Which modifiers are active (1 bit for each MOD_... value) */
uchar modifiers;
uchar flags; /* active state keys (FLAGS_...) */
uchar leds; /* active LEDs (INPUT_LED_...) */
uchar leds_changed; /* LEDs that just changed */
uchar num_tables; /* number of modifier tables */
int prev_keycodes[INPUT_BUFFER_LEN]; /* keys held last time */
int num_prev_keycodes; /* number of prev keys */
struct input_key_xlate table[INPUT_MAX_MODIFIERS];
/**
* Function the input helper calls to scan the keyboard
*
* @param config Input state
* @return 0 if no keys read, otherwise number of keys read, or 1 if
* unknown
*/
int (*read_keys)(struct input_config *config);
bool allow_repeats; /* Don't filter out repeats */
unsigned int next_repeat_ms; /* Next time we repeat a key */
unsigned int repeat_delay_ms; /* Time before autorepeat starts */
unsigned int repeat_rate_ms; /* Autorepeat rate in ms */
};
struct stdio_dev;
/**
* Convert a list of key codes into ASCII and send them
*
* @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);
/**
* Add a new keycode to an existing list of keycodes
*
* This can be used to handle keyboards which do their own scanning. An
* internal list of depressed keys is maintained by the input library. Then
* this function is called to add a new key to the list (when a 'make code' is
* received), or remove a key (when a 'break code' is received).
*
* This function looks after maintenance of the list of active keys, and calls
* input_send_keycodes() with its updated list.
*
* @param config Input state
* @param new_keycode New keycode to add/remove
* @param release true if this key was released, false if depressed
* @return number of ascii characters sent, or 0 if none, or -1 for an
* internal error
*/
int input_add_keycode(struct input_config *config, int new_keycode,
bool release);
/**
* Add a new key translation table to the input
*
* @param config Input state
* @param left_keycode Key to hold to get into this table
* @param right_keycode Another key to hold to get into this table
* @param xlate Conversion table from key codes to ASCII
* @param num_entries Number of entries in xlate table
*/
int input_add_table(struct input_config *config, int left_keycode,
int right_keycode, const uchar *xlate, int num_entries);
/**
* Test if keys are available to be read
*
* @param config Input state
* @return 0 if no keys available, 1 if keys are available
*/
int input_tstc(struct input_config *config);
/**
* Read a key
*
* TODO: U-Boot wants 0 for no key, but Ctrl-@ is a valid key...
*
* @param config Input state
* @return key, or 0 if no key, or -1 if error
*/
int input_getc(struct input_config *config);
/**
* Register a new device with stdio and switch to it if wanted
*
* @param dev Pointer to device
* @return 0 if ok, -1 on error
*/
int input_stdio_register(struct stdio_dev *dev);
/**
* Set up the keyboard autorepeat delays
*
* @param repeat_delay_ms Delay before key auto-repeat starts (in ms)
* @param repeat_rate_ms Delay between successive key repeats (in ms)
*/
void input_set_delays(struct input_config *config, int repeat_delay_ms,
int repeat_rate_ms);
/**
* Tell the input layer whether to allow the caller to determine repeats
*
* Generally the input library handles processing of a list of scanned keys.
* Repeated keys need to be generated based on a timer in this case, since all
* that is provided is a list of keys current depressed.
*
* Keyboards which do their own scanning will resend codes when they want to
* inject a repeating key. This function can be called at start-up to select
* this behaviour.
*
* @param config Input state
* @param allow_repeats true to repeat depressed keys every time
* input_send_keycodes() is called, false to do normal
* keyboard repeat processing with a timer.
*/
void input_allow_repeats(struct input_config *config, bool allow_repeats);
/**
* Check if keyboard LEDs need to be updated
*
* This can be called after input_tstc() to see if keyboard LEDs need
* updating.
*
* @param config Input state
* @return -1 if no LEDs need updating, other value if they do
*/
int input_leds_changed(struct input_config *config);
/**
* Set up the key map tables
*
* This must be called after input_init() or keycode decoding will not work.
*
* @param config Input state
* @param german true to use German keyboard layout, false for US
* @return 0 if ok, -1 on error
*/
int input_add_tables(struct input_config *config, bool german);
/**
* Set up the input handler with basic key maps.
*
* @param config Input state
* @param leds Initial LED value (INPUT_LED_ mask), 0 suggested
* @return 0 if ok, -1 on error
*/
int input_init(struct input_config *config, int leds);
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#define OVERWRITE_CONSOLE overwrite_console()
#else
#define OVERWRITE_CONSOLE 0
#endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
#endif