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- /*
- * GPIO key
- *
- * Copyright (c) 2016 Linaro Limited
- *
- * Author: Shannon Zhao <shannon.zhao@linaro.org>
- *
- * Emulate a (human) keypress -- when the key is triggered by
- * setting the incoming gpio line, the outbound irq line is
- * raised for 100ms before being dropped again.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, see <http://www.gnu.org/licenses/>.
- */
- #include "qemu/osdep.h"
- #include "hw/irq.h"
- #include "hw/sysbus.h"
- #include "migration/vmstate.h"
- #include "qemu/module.h"
- #include "qemu/timer.h"
- #include "qom/object.h"
- #define TYPE_GPIOKEY "gpio-key"
- OBJECT_DECLARE_SIMPLE_TYPE(GPIOKEYState, GPIOKEY)
- #define GPIO_KEY_LATENCY 100 /* 100ms */
- struct GPIOKEYState {
- SysBusDevice parent_obj;
- QEMUTimer *timer;
- qemu_irq irq;
- };
- static const VMStateDescription vmstate_gpio_key = {
- .name = "gpio-key",
- .version_id = 1,
- .minimum_version_id = 1,
- .fields = (VMStateField[]) {
- VMSTATE_TIMER_PTR(timer, GPIOKEYState),
- VMSTATE_END_OF_LIST()
- }
- };
- static void gpio_key_reset(DeviceState *dev)
- {
- GPIOKEYState *s = GPIOKEY(dev);
- timer_del(s->timer);
- }
- static void gpio_key_timer_expired(void *opaque)
- {
- GPIOKEYState *s = (GPIOKEYState *)opaque;
- qemu_set_irq(s->irq, 0);
- timer_del(s->timer);
- }
- static void gpio_key_set_irq(void *opaque, int irq, int level)
- {
- GPIOKEYState *s = (GPIOKEYState *)opaque;
- qemu_set_irq(s->irq, 1);
- timer_mod(s->timer,
- qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + GPIO_KEY_LATENCY);
- }
- static void gpio_key_realize(DeviceState *dev, Error **errp)
- {
- GPIOKEYState *s = GPIOKEY(dev);
- SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
- sysbus_init_irq(sbd, &s->irq);
- qdev_init_gpio_in(dev, gpio_key_set_irq, 1);
- s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, gpio_key_timer_expired, s);
- }
- static void gpio_key_class_init(ObjectClass *klass, void *data)
- {
- DeviceClass *dc = DEVICE_CLASS(klass);
- dc->realize = gpio_key_realize;
- dc->vmsd = &vmstate_gpio_key;
- dc->reset = &gpio_key_reset;
- }
- static const TypeInfo gpio_key_info = {
- .name = TYPE_GPIOKEY,
- .parent = TYPE_SYS_BUS_DEVICE,
- .instance_size = sizeof(GPIOKEYState),
- .class_init = gpio_key_class_init,
- };
- static void gpio_key_register_types(void)
- {
- type_register_static(&gpio_key_info);
- }
- type_init(gpio_key_register_types)
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