meson: convert hw/vfio
[qemu.git] / hw / gpio / gpio_key.c
1 /*
2 * GPIO key
3 *
4 * Copyright (c) 2016 Linaro Limited
5 *
6 * Author: Shannon Zhao <shannon.zhao@linaro.org>
7 *
8 * Emulate a (human) keypress -- when the key is triggered by
9 * setting the incoming gpio line, the outbound irq line is
10 * raised for 100ms before being dropped again.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License; either version 2
14 * of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include "qemu/osdep.h"
26 #include "hw/irq.h"
27 #include "hw/sysbus.h"
28 #include "migration/vmstate.h"
29 #include "qemu/module.h"
30 #include "qemu/timer.h"
31
32 #define TYPE_GPIOKEY "gpio-key"
33 #define GPIOKEY(obj) OBJECT_CHECK(GPIOKEYState, (obj), TYPE_GPIOKEY)
34 #define GPIO_KEY_LATENCY 100 /* 100ms */
35
36 typedef struct GPIOKEYState {
37 SysBusDevice parent_obj;
38
39 QEMUTimer *timer;
40 qemu_irq irq;
41 } GPIOKEYState;
42
43 static const VMStateDescription vmstate_gpio_key = {
44 .name = "gpio-key",
45 .version_id = 1,
46 .minimum_version_id = 1,
47 .fields = (VMStateField[]) {
48 VMSTATE_TIMER_PTR(timer, GPIOKEYState),
49 VMSTATE_END_OF_LIST()
50 }
51 };
52
53 static void gpio_key_reset(DeviceState *dev)
54 {
55 GPIOKEYState *s = GPIOKEY(dev);
56
57 timer_del(s->timer);
58 }
59
60 static void gpio_key_timer_expired(void *opaque)
61 {
62 GPIOKEYState *s = (GPIOKEYState *)opaque;
63
64 qemu_set_irq(s->irq, 0);
65 timer_del(s->timer);
66 }
67
68 static void gpio_key_set_irq(void *opaque, int irq, int level)
69 {
70 GPIOKEYState *s = (GPIOKEYState *)opaque;
71
72 qemu_set_irq(s->irq, 1);
73 timer_mod(s->timer,
74 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + GPIO_KEY_LATENCY);
75 }
76
77 static void gpio_key_realize(DeviceState *dev, Error **errp)
78 {
79 GPIOKEYState *s = GPIOKEY(dev);
80 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
81
82 sysbus_init_irq(sbd, &s->irq);
83 qdev_init_gpio_in(dev, gpio_key_set_irq, 1);
84 s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, gpio_key_timer_expired, s);
85 }
86
87 static void gpio_key_class_init(ObjectClass *klass, void *data)
88 {
89 DeviceClass *dc = DEVICE_CLASS(klass);
90
91 dc->realize = gpio_key_realize;
92 dc->vmsd = &vmstate_gpio_key;
93 dc->reset = &gpio_key_reset;
94 }
95
96 static const TypeInfo gpio_key_info = {
97 .name = TYPE_GPIOKEY,
98 .parent = TYPE_SYS_BUS_DEVICE,
99 .instance_size = sizeof(GPIOKEYState),
100 .class_init = gpio_key_class_init,
101 };
102
103 static void gpio_key_register_types(void)
104 {
105 type_register_static(&gpio_key_info);
106 }
107
108 type_init(gpio_key_register_types)