109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
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/*
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* GPIO key
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*
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* Copyright (c) 2016 Linaro Limited
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*
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* Author: Shannon Zhao <shannon.zhao@linaro.org>
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*
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* Emulate a (human) keypress -- when the key is triggered by
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* setting the incoming gpio line, the outbound irq line is
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* raised for 100ms before being dropped again.
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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; either version 2
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* of the License, or (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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "hw/irq.h"
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#include "hw/sysbus.h"
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#include "migration/vmstate.h"
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#include "qemu/module.h"
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#include "qemu/timer.h"
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#define TYPE_GPIOKEY "gpio-key"
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#define GPIOKEY(obj) OBJECT_CHECK(GPIOKEYState, (obj), TYPE_GPIOKEY)
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#define GPIO_KEY_LATENCY 100 /* 100ms */
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typedef struct GPIOKEYState {
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SysBusDevice parent_obj;
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QEMUTimer *timer;
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qemu_irq irq;
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} GPIOKEYState;
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static const VMStateDescription vmstate_gpio_key = {
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.name = "gpio-key",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_TIMER_PTR(timer, GPIOKEYState),
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VMSTATE_END_OF_LIST()
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}
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};
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static void gpio_key_reset(DeviceState *dev)
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{
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GPIOKEYState *s = GPIOKEY(dev);
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timer_del(s->timer);
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}
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static void gpio_key_timer_expired(void *opaque)
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{
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GPIOKEYState *s = (GPIOKEYState *)opaque;
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qemu_set_irq(s->irq, 0);
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timer_del(s->timer);
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}
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static void gpio_key_set_irq(void *opaque, int irq, int level)
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{
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GPIOKEYState *s = (GPIOKEYState *)opaque;
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qemu_set_irq(s->irq, 1);
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timer_mod(s->timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + GPIO_KEY_LATENCY);
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}
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static void gpio_key_realize(DeviceState *dev, Error **errp)
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{
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GPIOKEYState *s = GPIOKEY(dev);
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SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
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sysbus_init_irq(sbd, &s->irq);
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qdev_init_gpio_in(dev, gpio_key_set_irq, 1);
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s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, gpio_key_timer_expired, s);
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}
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static void gpio_key_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = gpio_key_realize;
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dc->vmsd = &vmstate_gpio_key;
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dc->reset = &gpio_key_reset;
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}
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static const TypeInfo gpio_key_info = {
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.name = TYPE_GPIOKEY,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(GPIOKEYState),
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.class_init = gpio_key_class_init,
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};
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static void gpio_key_register_types(void)
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{
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type_register_static(&gpio_key_info);
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}
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type_init(gpio_key_register_types)
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