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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <boot/boot.h>
#include <boot/gpio.h>
#include <boot/gpio_keypad.h>
int gpio_keypad_init(gpio_keypad_info *keypad)
{
unsigned i;
for(i = 0; i < keypad->noutputs; i++) {
gpio_set(keypad->output_gpios[i], keypad->polarity ^ keypad->drive_inactive_outputs);
gpio_dir(keypad->output_gpios[i], keypad->drive_inactive_outputs);
}
for(i = 0; i < keypad->ninputs; i++) {
gpio_dir(keypad->input_gpios[i], 0);
}
keypad->state = 0;
return 0;
}
void gpio_keypad_scan_keys(gpio_keypad_info *keypad)
{
unsigned out, in;
unsigned long long keys;
unsigned npolarity = !keypad->polarity;
unsigned int shift;
keys = 0;
out = keypad->noutputs;
shift = keypad->noutputs * keypad->ninputs;
while(out > 0) {
out--;
if(keypad->drive_inactive_outputs)
gpio_set(keypad->output_gpios[out], !npolarity);
else
gpio_dir(keypad->output_gpios[out], 1);
udelay(keypad->settle_time);
in = keypad->ninputs;
while(in > 0) {
in--;
shift--;
keys = (keys << 1) | (gpio_get(keypad->input_gpios[in]) ^ npolarity);
if(((unsigned)(keypad->state >> shift) ^ (unsigned)keys) & 1) {
unsigned int mapped_key = 0;
if(keypad->key_map)
mapped_key = keypad->key_map[shift];
//dprintf("gpio_keypad_scan_keys: %d-%d (%d-%d) %d (%d): %d\n", out, in,
// keypad->output_gpios[out], keypad->input_gpios[in],
// shift, mapped_key, keys & 1);
if(mapped_key && key_changed)
key_changed(mapped_key, keys & 1);
}
}
if(keypad->drive_inactive_outputs)
gpio_set(keypad->output_gpios[out], npolarity);
else
gpio_dir(keypad->output_gpios[out], 0);
}
if(keys != keypad->state) {
keypad->state = keys;
//dprintf("gpio_keypad_scan_keys: %x %x\n", (unsigned long)(keys >> 32), (unsigned long)keys);
}
}
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