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/*
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* Keyboard input helper functions (too small to be called a layer)
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*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _INPUT_H
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#define _INPUT_H
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enum {
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INPUT_MAX_MODIFIERS = 4,
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INPUT_BUFFER_LEN = 16,
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};
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enum {
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/* Keyboard LEDs */
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INPUT_LED_SCROLL = 1 << 0,
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INPUT_LED_CAPS = 1 << 1,
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INPUT_LED_NUM = 1 << 2,
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};
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/*
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* This table translates key codes to ASCII. Most of the entries are ASCII
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* codes, but entries after KEY_FIRST_MOD indicate that this key is a
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* modifier key, like shift, ctrl. KEY_FIRST_MOD + MOD_SHIFT is the shift
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* key, for example.
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*/
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struct input_key_xlate {
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/* keycode of the modifiers which select this table, -1 if none */
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int left_keycode;
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int right_keycode;
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const uchar *xlate; /* keycode to ASCII table */
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int num_entries; /* number of entries in this table */
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};
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struct input_config {
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uchar fifo[INPUT_BUFFER_LEN];
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int fifo_in, fifo_out;
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/* Which modifiers are active (1 bit for each MOD_... value) */
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uchar modifiers;
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uchar flags; /* active state keys (FLAGS_...) */
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uchar leds; /* active LEDS (INPUT_LED_...) */
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uchar num_tables; /* number of modifier tables */
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int prev_keycodes[INPUT_BUFFER_LEN]; /* keys held last time */
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int num_prev_keycodes; /* number of prev keys */
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struct input_key_xlate table[INPUT_MAX_MODIFIERS];
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/**
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* Function the input helper calls to scan the keyboard
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*
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* @param config Input state
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* @return 0 if no keys read, otherwise number of keys read, or 1 if
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* unknown
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*/
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int (*read_keys)(struct input_config *config);
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unsigned int next_repeat_ms; /* Next time we repeat a key */
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unsigned int repeat_delay_ms; /* Time before autorepeat starts */
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unsigned int repeat_rate_ms; /* Autorepeat rate in ms */
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};
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struct stdio_dev;
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/**
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* Convert a list of key codes into ASCII and send them
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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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* @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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/**
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* Add a new key translation table to the input
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*
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* @param config Input state
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* @param left_keycode Key to hold to get into this table
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* @param right_keycode Another key to hold to get into this table
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* @param xlate Conversion table from key codes to ASCII
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* @param num_entries Number of entries in xlate table
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*/
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int input_add_table(struct input_config *config, int left_keycode,
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int right_keycode, const uchar *xlate, int num_entries);
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/**
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* Test if keys are available to be read
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*
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* @param config Input state
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* @return 0 if no keys available, 1 if keys are available
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*/
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int input_tstc(struct input_config *config);
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/**
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* Read a key
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*
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* TODO: U-Boot wants 0 for no key, but Ctrl-@ is a valid key...
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*
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* @param config Input state
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* @return key, or 0 if no key, or -1 if error
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*/
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int input_getc(struct input_config *config);
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/**
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* Register a new device with stdio and switch to it if wanted
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*
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* @param dev Pointer to device
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* @return 0 if ok, -1 on error
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*/
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int input_stdio_register(struct stdio_dev *dev);
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/**
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* Set up the keyboard autorepeat delays
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*
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* @param repeat_delay_ms Delay before key auto-repeat starts (in ms)
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* @param repeat_rate_ms Delay between successive key repeats (in ms)
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*/
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void input_set_delays(struct input_config *config, int repeat_delay_ms,
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int repeat_rate_ms);
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/**
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* Set up the input handler with basic key maps.
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*
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* @param config Input state
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* @param leds Initial LED value (INPUT_LED_ mask), 0 suggested
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* @return 0 if ok, -1 on error
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*/
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int input_init(struct input_config *config, int leds);
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#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
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extern int overwrite_console(void);
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#define OVERWRITE_CONSOLE overwrite_console()
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#else
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#define OVERWRITE_CONSOLE 0
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#endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
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#endif
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