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 | |
10 | #include "qemu/osdep.h" |
11 | #include "hw/input/gamepad.h" |
12 | #include "hw/irq.h" |
13 | #include "migration/vmstate.h" |
14 | #include "ui/console.h" |
15 | |
16 | typedef struct { |
17 | qemu_irq irq; |
18 | int keycode; |
19 | uint8_t pressed; |
20 | } gamepad_button; |
21 | |
22 | typedef struct { |
23 | gamepad_button *buttons; |
24 | int num_buttons; |
25 | int extension; |
26 | } gamepad_state; |
27 | |
28 | static void stellaris_gamepad_put_key(void * opaque, int keycode) |
29 | { |
30 | gamepad_state *s = (gamepad_state *)opaque; |
31 | int i; |
32 | int down; |
33 | |
34 | if (keycode == 0xe0 && !s->extension) { |
35 | s->extension = 0x80; |
36 | return; |
37 | } |
38 | |
39 | down = (keycode & 0x80) == 0; |
40 | keycode = (keycode & 0x7f) | s->extension; |
41 | |
42 | for (i = 0; i < s->num_buttons; i++) { |
43 | if (s->buttons[i].keycode == keycode |
44 | && s->buttons[i].pressed != down) { |
45 | s->buttons[i].pressed = down; |
46 | qemu_set_irq(s->buttons[i].irq, down); |
47 | } |
48 | } |
49 | |
50 | s->extension = 0; |
51 | } |
52 | |
53 | static const VMStateDescription vmstate_stellaris_button = { |
54 | .name = "stellaris_button" , |
55 | .version_id = 0, |
56 | .minimum_version_id = 0, |
57 | .fields = (VMStateField[]) { |
58 | VMSTATE_UINT8(pressed, gamepad_button), |
59 | VMSTATE_END_OF_LIST() |
60 | } |
61 | }; |
62 | |
63 | static const VMStateDescription vmstate_stellaris_gamepad = { |
64 | .name = "stellaris_gamepad" , |
65 | .version_id = 2, |
66 | .minimum_version_id = 2, |
67 | .fields = (VMStateField[]) { |
68 | VMSTATE_INT32(extension, gamepad_state), |
69 | VMSTATE_STRUCT_VARRAY_POINTER_INT32(buttons, gamepad_state, |
70 | num_buttons, |
71 | vmstate_stellaris_button, |
72 | gamepad_button), |
73 | VMSTATE_END_OF_LIST() |
74 | } |
75 | }; |
76 | |
77 | /* Returns an array of 5 output slots. */ |
78 | void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode) |
79 | { |
80 | gamepad_state *s; |
81 | int i; |
82 | |
83 | s = g_new0(gamepad_state, 1); |
84 | s->buttons = g_new0(gamepad_button, n); |
85 | for (i = 0; i < n; i++) { |
86 | s->buttons[i].irq = irq[i]; |
87 | s->buttons[i].keycode = keycode[i]; |
88 | } |
89 | s->num_buttons = n; |
90 | qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s); |
91 | vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s); |
92 | } |
93 | |