These changes are the raw update to qemu-2.6.
[kvmfornfv.git] / qemu / hw / input / stellaris_input.c
1 /*
2  * Gamepad style buttons connected to IRQ/GPIO lines
3  *
4  * Copyright (c) 2007 CodeSourcery.
5  * Written by Paul Brook
6  *
7  * This code is licensed under the GPL.
8  */
9 #include "qemu/osdep.h"
10 #include "hw/hw.h"
11 #include "hw/devices.h"
12 #include "ui/console.h"
13
14 typedef struct {
15     qemu_irq irq;
16     int keycode;
17     uint8_t pressed;
18 } gamepad_button;
19
20 typedef struct {
21     gamepad_button *buttons;
22     int num_buttons;
23     int extension;
24 } gamepad_state;
25
26 static void stellaris_gamepad_put_key(void * opaque, int keycode)
27 {
28     gamepad_state *s = (gamepad_state *)opaque;
29     int i;
30     int down;
31
32     if (keycode == 0xe0 && !s->extension) {
33         s->extension = 0x80;
34         return;
35     }
36
37     down = (keycode & 0x80) == 0;
38     keycode = (keycode & 0x7f) | s->extension;
39
40     for (i = 0; i < s->num_buttons; i++) {
41         if (s->buttons[i].keycode == keycode
42                 && s->buttons[i].pressed != down) {
43             s->buttons[i].pressed = down;
44             qemu_set_irq(s->buttons[i].irq, down);
45         }
46     }
47
48     s->extension = 0;
49 }
50
51 static const VMStateDescription vmstate_stellaris_button = {
52     .name = "stellaris_button",
53     .version_id = 0,
54     .minimum_version_id = 0,
55     .fields = (VMStateField[]) {
56         VMSTATE_UINT8(pressed, gamepad_button),
57         VMSTATE_END_OF_LIST()
58     }
59 };
60
61 static const VMStateDescription vmstate_stellaris_gamepad = {
62     .name = "stellaris_gamepad",
63     .version_id = 1,
64     .minimum_version_id = 1,
65     .fields = (VMStateField[]) {
66         VMSTATE_INT32(extension, gamepad_state),
67         VMSTATE_STRUCT_VARRAY_INT32(buttons, gamepad_state, num_buttons, 0,
68                               vmstate_stellaris_button, gamepad_button),
69         VMSTATE_END_OF_LIST()
70     }
71 };
72
73 /* Returns an array of 5 output slots.  */
74 void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
75 {
76     gamepad_state *s;
77     int i;
78
79     s = g_new0(gamepad_state, 1);
80     s->buttons = g_new0(gamepad_button, n);
81     for (i = 0; i < n; i++) {
82         s->buttons[i].irq = irq[i];
83         s->buttons[i].keycode = keycode[i];
84     }
85     s->num_buttons = n;
86     qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
87     vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
88 }