diff options
Diffstat (limited to 'libboot/gpio_keypad.c')
| -rw-r--r-- | libboot/gpio_keypad.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/libboot/gpio_keypad.c b/libboot/gpio_keypad.c new file mode 100644 index 0000000..b1ec7c2 --- /dev/null +++ b/libboot/gpio_keypad.c @@ -0,0 +1,90 @@ +/* + * 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); + } +} + |