/* * 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/sysbus.h" #include "qemu/timer.h" #define TYPE_GPIOKEY "gpio-key" #define GPIOKEY(obj) OBJECT_CHECK(GPIOKEYState, (obj), TYPE_GPIOKEY) #define GPIO_KEY_LATENCY 100 /* 100ms */ typedef struct GPIOKEYState { SysBusDevice parent_obj; QEMUTimer *timer; qemu_irq irq; } GPIOKEYState; 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)