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e5a8152c SZ |
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/sysbus.h" | |
0b8fa32f | 27 | #include "qemu/module.h" |
df43d49c | 28 | #include "qemu/timer.h" |
e5a8152c SZ |
29 | |
30 | #define TYPE_GPIOKEY "gpio-key" | |
31 | #define GPIOKEY(obj) OBJECT_CHECK(GPIOKEYState, (obj), TYPE_GPIOKEY) | |
32 | #define GPIO_KEY_LATENCY 100 /* 100ms */ | |
33 | ||
34 | typedef struct GPIOKEYState { | |
35 | SysBusDevice parent_obj; | |
36 | ||
37 | QEMUTimer *timer; | |
38 | qemu_irq irq; | |
39 | } GPIOKEYState; | |
40 | ||
41 | static const VMStateDescription vmstate_gpio_key = { | |
42 | .name = "gpio-key", | |
43 | .version_id = 1, | |
44 | .minimum_version_id = 1, | |
45 | .fields = (VMStateField[]) { | |
46 | VMSTATE_TIMER_PTR(timer, GPIOKEYState), | |
47 | VMSTATE_END_OF_LIST() | |
48 | } | |
49 | }; | |
50 | ||
51 | static void gpio_key_reset(DeviceState *dev) | |
52 | { | |
53 | GPIOKEYState *s = GPIOKEY(dev); | |
54 | ||
55 | timer_del(s->timer); | |
56 | } | |
57 | ||
58 | static void gpio_key_timer_expired(void *opaque) | |
59 | { | |
60 | GPIOKEYState *s = (GPIOKEYState *)opaque; | |
61 | ||
62 | qemu_set_irq(s->irq, 0); | |
63 | timer_del(s->timer); | |
64 | } | |
65 | ||
66 | static void gpio_key_set_irq(void *opaque, int irq, int level) | |
67 | { | |
68 | GPIOKEYState *s = (GPIOKEYState *)opaque; | |
69 | ||
70 | qemu_set_irq(s->irq, 1); | |
71 | timer_mod(s->timer, | |
72 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + GPIO_KEY_LATENCY); | |
73 | } | |
74 | ||
75 | static void gpio_key_realize(DeviceState *dev, Error **errp) | |
76 | { | |
77 | GPIOKEYState *s = GPIOKEY(dev); | |
78 | SysBusDevice *sbd = SYS_BUS_DEVICE(dev); | |
79 | ||
80 | sysbus_init_irq(sbd, &s->irq); | |
81 | qdev_init_gpio_in(dev, gpio_key_set_irq, 1); | |
82 | s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, gpio_key_timer_expired, s); | |
83 | } | |
84 | ||
85 | static void gpio_key_class_init(ObjectClass *klass, void *data) | |
86 | { | |
87 | DeviceClass *dc = DEVICE_CLASS(klass); | |
88 | ||
89 | dc->realize = gpio_key_realize; | |
90 | dc->vmsd = &vmstate_gpio_key; | |
91 | dc->reset = &gpio_key_reset; | |
92 | } | |
93 | ||
94 | static const TypeInfo gpio_key_info = { | |
95 | .name = TYPE_GPIOKEY, | |
96 | .parent = TYPE_SYS_BUS_DEVICE, | |
97 | .instance_size = sizeof(GPIOKEYState), | |
98 | .class_init = gpio_key_class_init, | |
99 | }; | |
100 | ||
101 | static void gpio_key_register_types(void) | |
102 | { | |
103 | type_register_static(&gpio_key_info); | |
104 | } | |
105 | ||
106 | type_init(gpio_key_register_types) |