190 lines
4.2 KiB
C
190 lines
4.2 KiB
C
/* Driver for the keypad attached to the TI Calypso */
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/* (C) 2010 by roh <roh@hyte.de>
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* (C) 2013-19 by Steve Markgraf <steve@steve-m.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <defines.h>
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#include <debug.h>
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#include <delay.h>
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#include <memory.h>
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#include <keypad.h>
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#include <calypso/irq.h>
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#include <abb/twl3025.h>
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#include <comm/timer.h>
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#define KBR_LATCH_REG 0xfffe480a
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#define KBC_REG 0xfffe480c
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#define KBD_GPIO_INT 0xfffe4816
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#define KBD_GPIO_MASKIT 0xfffe4818
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static key_handler_t key_handler = NULL;
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void emit_key(uint8_t key, uint8_t state)
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{
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printf("key=%u %s\n", key, state == PRESSED ? "pressed" : "released");
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if(key_handler) {
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key_handler(key, state);
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}
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}
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volatile uint32_t lastbuttons = 0;
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static const uint8_t *btn_map;
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unsigned long power_hold = 0;
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void dispatch_buttons(uint32_t buttons)
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{
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int i;
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uint8_t state;
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if ((buttons & (1 << btn_map[KEY_POWER]))) {
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/* hold button 500ms to shut down */
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if ((lastbuttons & (1 << btn_map[KEY_POWER]))) {
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unsigned long elapsed = jiffies - power_hold;
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if (elapsed > 50)
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twl3025_power_off();
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power_hold++;
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} else
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power_hold = jiffies;
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}
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if (buttons == lastbuttons)
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return;
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uint32_t diff = buttons ^ lastbuttons;
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for (i = 0; i < BUTTON_CNT; i++) {
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if (diff & (1 << btn_map[i])) {
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state = (buttons & (1 << btn_map[i])) ? PRESSED : RELEASED;
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emit_key(i, state);
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}
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}
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lastbuttons = buttons;
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}
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static uint8_t polling = 0;
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static uint8_t with_interrupts = 0;
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static void keypad_irq(__unused enum irq_nr nr)
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{
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/* enable polling */
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polling = 1;
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irq_disable(IRQ_KEYPAD_GPIO);
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}
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void keypad_init(const uint8_t *keymap, uint8_t interrupts)
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{
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btn_map = keymap;
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lastbuttons = 0;
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polling = 0;
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writew(0, KBD_GPIO_MASKIT);
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writew(0, KBC_REG);
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if(interrupts) {
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with_interrupts = 1;
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irq_register_handler(IRQ_KEYPAD_GPIO, &keypad_irq);
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irq_config(IRQ_KEYPAD_GPIO, 0, 0, 0);
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irq_enable(IRQ_KEYPAD_GPIO);
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}
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}
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void keypad_set_handler(key_handler_t handler)
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{
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key_handler = handler;
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}
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void keypad_poll()
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{
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static uint16_t reg;
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static uint16_t col;
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static uint32_t buttons = 0, debounce1 = 0, debounce2 = 0;
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uint8_t use_iota_pwrbtn = (btn_map[KEY_POWER] == 31);
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uint32_t pwr_mask = (1 << btn_map[KEY_POWER]);
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/* only read Iota powerbutton if it was not yet pressed */
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if (use_iota_pwrbtn && !(buttons & pwr_mask) && twl3025_get_pwon()) {
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buttons |= pwr_mask;
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if (!polling)
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polling = 1;
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}
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if (with_interrupts && !polling)
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return;
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/* start polling */
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if (polling == 1) {
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writew(0x1f & ~0x1, KBC_REG); /* first col */
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col = 0;
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polling = 2;
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return;
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}
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/* enable keypad irq after the signal settles */
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if (polling == 3) {
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if(with_interrupts) {
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irq_enable(IRQ_KEYPAD_GPIO);
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polling = 0;
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} else {
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polling = 1;
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}
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return;
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}
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reg = readw(KBR_LATCH_REG);
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buttons = (buttons & ~(0x1f << (col * 5)))
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| ((~reg & 0x1f) << (col * 5 ));
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/* if key is released, stay in column for faster debounce */
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if ((debounce1 | debounce2) & ~buttons) {
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debounce2 = debounce1;
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debounce1 = buttons;
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return;
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}
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col++;
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if (col > 5) {
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col = 0;
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/* if power button, ignore other states */
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if (buttons & pwr_mask)
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buttons = lastbuttons | pwr_mask;
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else if (lastbuttons & pwr_mask)
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buttons = lastbuttons & ~pwr_mask;
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dispatch_buttons(buttons);
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/* check if powerbutton connected to Iota was released */
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if (use_iota_pwrbtn && (buttons & pwr_mask) && !twl3025_get_pwon()) {
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buttons &= ~pwr_mask;
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/* dispatch buttons again so we do not loose
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* very short powerbutton presses */
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dispatch_buttons(buttons);
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}
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if (buttons == 0) {
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writew(0x0, KBC_REG);
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polling = 3;
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return;
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}
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}
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if (col == 5)
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writew(0xff, KBC_REG);
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else
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writew(0x1f & ~(0x1 << col ), KBC_REG);
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}
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