| /* |
| * Copyright (c) 2009, Google Inc. |
| * 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. |
| * * Neither the name of Google, Inc. nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * 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 <assert.h> |
| #include <bits.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <dev/keys.h> |
| #include <dev/gpio.h> |
| #include <dev/gpio_keypad.h> |
| #include <kernel/event.h> |
| #include <kernel/timer.h> |
| |
| struct gpio_kp { |
| struct gpio_keypad_info *keypad_info; |
| struct timer timer; |
| event_t full_scan; |
| int current_output; |
| unsigned int some_keys_pressed:2; |
| unsigned long keys_pressed[0]; |
| }; |
| |
| /* TODO: Support multiple keypads? */ |
| static struct gpio_kp *keypad; |
| |
| static void check_output(struct gpio_kp *kp, int out, int polarity) |
| { |
| struct gpio_keypad_info *kpinfo = kp->keypad_info; |
| int key_index; |
| int in; |
| int gpio; |
| int changed = 0; |
| |
| key_index = out * kpinfo->ninputs; |
| for (in = 0; in < kpinfo->ninputs; in++, key_index++) { |
| gpio = kpinfo->input_gpios[in]; |
| changed = 0; |
| if (gpio_get(gpio) ^ !polarity) { |
| if (kp->some_keys_pressed < 3) |
| kp->some_keys_pressed++; |
| changed = !bitmap_set(kp->keys_pressed, key_index); |
| } else { |
| changed = bitmap_clear(kp->keys_pressed, key_index); |
| } |
| if (changed) { |
| int state = bitmap_test(kp->keys_pressed, key_index); |
| keys_post_event(kpinfo->keymap[key_index], state); |
| } |
| } |
| |
| /* sets up the right state for the next poll cycle */ |
| gpio = kpinfo->output_gpios[out]; |
| if (kpinfo->flags & GPIOKPF_DRIVE_INACTIVE) |
| gpio_set(gpio, !polarity); |
| else |
| gpio_config(gpio, GPIO_INPUT); |
| } |
| |
| static enum handler_return |
| gpio_keypad_timer_func(struct timer *timer, time_t now, void *arg) |
| { |
| struct gpio_kp *kp = keypad; |
| struct gpio_keypad_info *kpinfo = kp->keypad_info; |
| int polarity = !!(kpinfo->flags & GPIOKPF_ACTIVE_HIGH); |
| int out; |
| int gpio; |
| |
| out = kp->current_output; |
| if (out == kpinfo->noutputs) { |
| out = 0; |
| kp->some_keys_pressed = 0; |
| } else { |
| check_output(kp, out, polarity); |
| out++; |
| } |
| |
| kp->current_output = out; |
| if (out < kpinfo->noutputs) { |
| gpio = kpinfo->output_gpios[out]; |
| if (kpinfo->flags & GPIOKPF_DRIVE_INACTIVE) |
| gpio_set(gpio, polarity); |
| else |
| gpio_config(gpio, polarity ? GPIO_OUTPUT : 0); |
| timer_set_oneshot(timer, kpinfo->settle_time, |
| gpio_keypad_timer_func, NULL); |
| goto done; |
| } |
| |
| if (/*!kp->use_irq*/ 1 || kp->some_keys_pressed) { |
| event_signal(&kp->full_scan, false); |
| timer_set_oneshot(timer, kpinfo->poll_time, |
| gpio_keypad_timer_func, NULL); |
| goto done; |
| } |
| |
| #if 0 |
| /* No keys are pressed, reenable interrupt */ |
| for (out = 0; out < kpinfo->noutputs; out++) { |
| if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE) |
| gpio_set(kpinfo->output_gpios[out], polarity); |
| else |
| gpio_config(kpinfo->output_gpios[out], polarity ? GPIO_OUTPUT : 0); |
| } |
| for (in = 0; in < kpinfo->ninputs; in++) |
| enable_irq(gpio_to_irq(kpinfo->input_gpios[in])); |
| return INT_RESCHEDULE; |
| #endif |
| |
| done: |
| return INT_RESCHEDULE; |
| } |
| |
| void gpio_keypad_init(struct gpio_keypad_info *kpinfo) |
| { |
| int key_count; |
| int output_val; |
| int output_cfg; |
| int i; |
| int len; |
| |
| ASSERT(kpinfo->keymap && kpinfo->input_gpios && kpinfo->output_gpios); |
| key_count = kpinfo->ninputs * kpinfo->noutputs; |
| |
| len = sizeof(struct gpio_kp) + (sizeof(unsigned long) * |
| BITMAP_NUM_WORDS(key_count)); |
| keypad = malloc(len); |
| ASSERT(keypad); |
| |
| memset(keypad, 0, len); |
| keypad->keypad_info = kpinfo; |
| |
| output_val = (!!(kpinfo->flags & GPIOKPF_ACTIVE_HIGH)) ^ |
| (!!(kpinfo->flags & GPIOKPF_DRIVE_INACTIVE)); |
| output_cfg = kpinfo->flags & GPIOKPF_DRIVE_INACTIVE ? GPIO_OUTPUT : 0; |
| for (i = 0; i < kpinfo->noutputs; i++) { |
| gpio_set(kpinfo->output_gpios[i], output_val); |
| gpio_config(kpinfo->output_gpios[i], output_cfg); |
| } |
| for (i = 0; i < kpinfo->ninputs; i++) |
| gpio_config(kpinfo->input_gpios[i], GPIO_INPUT); |
| |
| keypad->current_output = kpinfo->noutputs; |
| |
| event_init(&keypad->full_scan, false, EVENT_FLAG_AUTOUNSIGNAL); |
| timer_initialize(&keypad->timer); |
| timer_set_oneshot(&keypad->timer, 0, gpio_keypad_timer_func, NULL); |
| |
| /* wait for the keypad to complete one full scan */ |
| event_wait(&keypad->full_scan); |
| } |