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/stellaris_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 } StellarisGamepadButton; 21 22 typedef struct { 23 StellarisGamepadButton *buttons; 24 int num_buttons; 25 int extension; 26 } StellarisGamepad; 27 28 static void stellaris_gamepad_put_key(void * opaque, int keycode) 29 { 30 StellarisGamepad *s = (StellarisGamepad *)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, StellarisGamepadButton), 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, StellarisGamepad), 69 VMSTATE_STRUCT_VARRAY_POINTER_INT32(buttons, StellarisGamepad, 70 num_buttons, 71 vmstate_stellaris_button, 72 StellarisGamepadButton), 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 StellarisGamepad *s; 81 int i; 82 83 s = g_new0(StellarisGamepad, 1); 84 s->buttons = g_new0(StellarisGamepadButton, 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, VMSTATE_INSTANCE_ID_ANY, 92 &vmstate_stellaris_gamepad, s); 93 } 94