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+/*
+ * Keyboard input helper functions (too small to be called a layer)
+ *
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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_CAPS = 1 << 1,
+ INPUT_LED_NUM = 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 {
+ 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 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);
+ 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
+ */
+int input_send_keycodes(struct input_config *config, int keycode[], int count);
+
+/**
+ * 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 input handler with basic key maps.
+ *
+ * @param config Input state
+ * @param leds Initial LED value (INPUT_LED_ mask), 0 suggested
+ * @param repeat_delay_ms Delay before key auto-repeat starts (in ms)
+ * @param repeat_rate_ms Delay between successive key repeats (in ms)
+ * @return 0 if ok, -1 on error
+ */
+int input_init(struct input_config *config, int leds, int repeat_delay_ms,
+ int repeat_rate_ms);
+
+#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