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1cf5ae5129
qemu/hw/input/adb-kbd.c
Philippe Mathieu-Daudé 1cf5ae5129 hw/input/adb-kbd: Remove dead assignment 
Since commit 5a1f49718 the 'olen' variable is not really
used. Remove it to fix a warning reported by Clang static
code analyzer:

    CC      hw/input/adb-kbd.o
  hw/input/adb-kbd.c:200:5: warning: Value stored to 'olen' is never read
      olen = 0;
      ^      ~

Fixes: 5a1f49718 (adb: add support for QKeyCode)
Reported-by: Clang Static Analyzer
Suggested-by: BALATON Zoltan <balaton@eik.bme.hu>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200422133152.16770-5-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2020-05-04 14:43:24 +02:00

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/*
* QEMU ADB keyboard support
*
* Copyright (c) 2004 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/input/adb.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "ui/input.h"
#include "hw/input/adb-keys.h"
#include "adb-internal.h"
#include "trace.h"
#define ADB_KEYBOARD(obj) OBJECT_CHECK(KBDState, (obj), TYPE_ADB_KEYBOARD)
typedef struct KBDState {
/*< private >*/
ADBDevice parent_obj;
/*< public >*/
uint8_t data[128];
int rptr, wptr, count;
} KBDState;
#define ADB_KEYBOARD_CLASS(class) \
OBJECT_CLASS_CHECK(ADBKeyboardClass, (class), TYPE_ADB_KEYBOARD)
#define ADB_KEYBOARD_GET_CLASS(obj) \
OBJECT_GET_CLASS(ADBKeyboardClass, (obj), TYPE_ADB_KEYBOARD)
typedef struct ADBKeyboardClass {
/*< private >*/
ADBDeviceClass parent_class;
/*< public >*/
DeviceRealize parent_realize;
} ADBKeyboardClass;
/* The adb keyboard doesn't have every key imaginable */
#define NO_KEY 0xff
int qcode_to_adb_keycode[] = {
/* Make sure future additions are automatically set to NO_KEY */
[0 ... 0xff] = NO_KEY,
[Q_KEY_CODE_SHIFT] = ADB_KEY_LEFT_SHIFT,
[Q_KEY_CODE_SHIFT_R] = ADB_KEY_RIGHT_SHIFT,
[Q_KEY_CODE_ALT] = ADB_KEY_LEFT_OPTION,
[Q_KEY_CODE_ALT_R] = ADB_KEY_RIGHT_OPTION,
[Q_KEY_CODE_CTRL] = ADB_KEY_LEFT_CONTROL,
[Q_KEY_CODE_CTRL_R] = ADB_KEY_RIGHT_CONTROL,
[Q_KEY_CODE_META_L] = ADB_KEY_COMMAND,
[Q_KEY_CODE_META_R] = ADB_KEY_COMMAND,
[Q_KEY_CODE_SPC] = ADB_KEY_SPACEBAR,
[Q_KEY_CODE_ESC] = ADB_KEY_ESC,
[Q_KEY_CODE_1] = ADB_KEY_1,
[Q_KEY_CODE_2] = ADB_KEY_2,
[Q_KEY_CODE_3] = ADB_KEY_3,
[Q_KEY_CODE_4] = ADB_KEY_4,
[Q_KEY_CODE_5] = ADB_KEY_5,
[Q_KEY_CODE_6] = ADB_KEY_6,
[Q_KEY_CODE_7] = ADB_KEY_7,
[Q_KEY_CODE_8] = ADB_KEY_8,
[Q_KEY_CODE_9] = ADB_KEY_9,
[Q_KEY_CODE_0] = ADB_KEY_0,
[Q_KEY_CODE_MINUS] = ADB_KEY_MINUS,
[Q_KEY_CODE_EQUAL] = ADB_KEY_EQUAL,
[Q_KEY_CODE_BACKSPACE] = ADB_KEY_DELETE,
[Q_KEY_CODE_TAB] = ADB_KEY_TAB,
[Q_KEY_CODE_Q] = ADB_KEY_Q,
[Q_KEY_CODE_W] = ADB_KEY_W,
[Q_KEY_CODE_E] = ADB_KEY_E,
[Q_KEY_CODE_R] = ADB_KEY_R,
[Q_KEY_CODE_T] = ADB_KEY_T,
[Q_KEY_CODE_Y] = ADB_KEY_Y,
[Q_KEY_CODE_U] = ADB_KEY_U,
[Q_KEY_CODE_I] = ADB_KEY_I,
[Q_KEY_CODE_O] = ADB_KEY_O,
[Q_KEY_CODE_P] = ADB_KEY_P,
[Q_KEY_CODE_BRACKET_LEFT] = ADB_KEY_LEFT_BRACKET,
[Q_KEY_CODE_BRACKET_RIGHT] = ADB_KEY_RIGHT_BRACKET,
[Q_KEY_CODE_RET] = ADB_KEY_RETURN,
[Q_KEY_CODE_A] = ADB_KEY_A,
[Q_KEY_CODE_S] = ADB_KEY_S,
[Q_KEY_CODE_D] = ADB_KEY_D,
[Q_KEY_CODE_F] = ADB_KEY_F,
[Q_KEY_CODE_G] = ADB_KEY_G,
[Q_KEY_CODE_H] = ADB_KEY_H,
[Q_KEY_CODE_J] = ADB_KEY_J,
[Q_KEY_CODE_K] = ADB_KEY_K,
[Q_KEY_CODE_L] = ADB_KEY_L,
[Q_KEY_CODE_SEMICOLON] = ADB_KEY_SEMICOLON,
[Q_KEY_CODE_APOSTROPHE] = ADB_KEY_APOSTROPHE,
[Q_KEY_CODE_GRAVE_ACCENT] = ADB_KEY_GRAVE_ACCENT,
[Q_KEY_CODE_BACKSLASH] = ADB_KEY_BACKSLASH,
[Q_KEY_CODE_Z] = ADB_KEY_Z,
[Q_KEY_CODE_X] = ADB_KEY_X,
[Q_KEY_CODE_C] = ADB_KEY_C,
[Q_KEY_CODE_V] = ADB_KEY_V,
[Q_KEY_CODE_B] = ADB_KEY_B,
[Q_KEY_CODE_N] = ADB_KEY_N,
[Q_KEY_CODE_M] = ADB_KEY_M,
[Q_KEY_CODE_COMMA] = ADB_KEY_COMMA,
[Q_KEY_CODE_DOT] = ADB_KEY_PERIOD,
[Q_KEY_CODE_SLASH] = ADB_KEY_FORWARD_SLASH,
[Q_KEY_CODE_ASTERISK] = ADB_KEY_KP_MULTIPLY,
[Q_KEY_CODE_CAPS_LOCK] = ADB_KEY_CAPS_LOCK,
[Q_KEY_CODE_F1] = ADB_KEY_F1,
[Q_KEY_CODE_F2] = ADB_KEY_F2,
[Q_KEY_CODE_F3] = ADB_KEY_F3,
[Q_KEY_CODE_F4] = ADB_KEY_F4,
[Q_KEY_CODE_F5] = ADB_KEY_F5,
[Q_KEY_CODE_F6] = ADB_KEY_F6,
[Q_KEY_CODE_F7] = ADB_KEY_F7,
[Q_KEY_CODE_F8] = ADB_KEY_F8,
[Q_KEY_CODE_F9] = ADB_KEY_F9,
[Q_KEY_CODE_F10] = ADB_KEY_F10,
[Q_KEY_CODE_F11] = ADB_KEY_F11,
[Q_KEY_CODE_F12] = ADB_KEY_F12,
[Q_KEY_CODE_PRINT] = ADB_KEY_F13,
[Q_KEY_CODE_SYSRQ] = ADB_KEY_F13,
[Q_KEY_CODE_SCROLL_LOCK] = ADB_KEY_F14,
[Q_KEY_CODE_PAUSE] = ADB_KEY_F15,
[Q_KEY_CODE_NUM_LOCK] = ADB_KEY_KP_CLEAR,
[Q_KEY_CODE_KP_EQUALS] = ADB_KEY_KP_EQUAL,
[Q_KEY_CODE_KP_DIVIDE] = ADB_KEY_KP_DIVIDE,
[Q_KEY_CODE_KP_MULTIPLY] = ADB_KEY_KP_MULTIPLY,
[Q_KEY_CODE_KP_SUBTRACT] = ADB_KEY_KP_SUBTRACT,
[Q_KEY_CODE_KP_ADD] = ADB_KEY_KP_PLUS,
[Q_KEY_CODE_KP_ENTER] = ADB_KEY_KP_ENTER,
[Q_KEY_CODE_KP_DECIMAL] = ADB_KEY_KP_PERIOD,
[Q_KEY_CODE_KP_0] = ADB_KEY_KP_0,
[Q_KEY_CODE_KP_1] = ADB_KEY_KP_1,
[Q_KEY_CODE_KP_2] = ADB_KEY_KP_2,
[Q_KEY_CODE_KP_3] = ADB_KEY_KP_3,
[Q_KEY_CODE_KP_4] = ADB_KEY_KP_4,
[Q_KEY_CODE_KP_5] = ADB_KEY_KP_5,
[Q_KEY_CODE_KP_6] = ADB_KEY_KP_6,
[Q_KEY_CODE_KP_7] = ADB_KEY_KP_7,
[Q_KEY_CODE_KP_8] = ADB_KEY_KP_8,
[Q_KEY_CODE_KP_9] = ADB_KEY_KP_9,
[Q_KEY_CODE_UP] = ADB_KEY_UP,
[Q_KEY_CODE_DOWN] = ADB_KEY_DOWN,
[Q_KEY_CODE_LEFT] = ADB_KEY_LEFT,
[Q_KEY_CODE_RIGHT] = ADB_KEY_RIGHT,
[Q_KEY_CODE_HELP] = ADB_KEY_HELP,
[Q_KEY_CODE_INSERT] = ADB_KEY_HELP,
[Q_KEY_CODE_DELETE] = ADB_KEY_FORWARD_DELETE,
[Q_KEY_CODE_HOME] = ADB_KEY_HOME,
[Q_KEY_CODE_END] = ADB_KEY_END,
[Q_KEY_CODE_PGUP] = ADB_KEY_PAGE_UP,
[Q_KEY_CODE_PGDN] = ADB_KEY_PAGE_DOWN,
[Q_KEY_CODE_POWER] = ADB_KEY_POWER
};
static void adb_kbd_put_keycode(void *opaque, int keycode)
{
KBDState *s = opaque;
if (s->count < sizeof(s->data)) {
s->data[s->wptr] = keycode;
if (++s->wptr == sizeof(s->data)) {
s->wptr = 0;
}
s->count++;
}
}
static int adb_kbd_poll(ADBDevice *d, uint8_t *obuf)
{
KBDState *s = ADB_KEYBOARD(d);
int keycode;
if (s->count == 0) {
return 0;
}
keycode = s->data[s->rptr];
s->rptr++;
if (s->rptr == sizeof(s->data)) {
s->rptr = 0;
}
s->count--;
/*
* The power key is the only two byte value key, so it is a special case.
* Since 0x7f is not a used keycode for ADB we overload it to indicate the
* power button when we're storing keycodes in our internal buffer, and
* expand it out to two bytes when we send to the guest.
*/
if (keycode == 0x7f) {
obuf[0] = 0x7f;
obuf[1] = 0x7f;
} else {
obuf[0] = keycode;
/* NOTE: the power key key-up is the two byte sequence 0xff 0xff;
* otherwise we could in theory send a second keycode in the second
* byte, but choose not to bother.
*/
obuf[1] = 0xff;
}
return 2;
}
static int adb_kbd_request(ADBDevice *d, uint8_t *obuf,
const uint8_t *buf, int len)
{
KBDState *s = ADB_KEYBOARD(d);
int cmd, reg, olen;
if ((buf[0] & 0x0f) == ADB_FLUSH) {
/* flush keyboard fifo */
s->wptr = s->rptr = s->count = 0;
return 0;
}
cmd = buf[0] & 0xc;
reg = buf[0] & 0x3;
olen = 0;
switch (cmd) {
case ADB_WRITEREG:
trace_adb_kbd_writereg(reg, buf[1]);
switch (reg) {
case 2:
/* LED status */
break;
case 3:
switch (buf[2]) {
case ADB_CMD_SELF_TEST:
break;
case ADB_CMD_CHANGE_ID:
case ADB_CMD_CHANGE_ID_AND_ACT:
case ADB_CMD_CHANGE_ID_AND_ENABLE:
d->devaddr = buf[1] & 0xf;
trace_adb_kbd_request_change_addr(d->devaddr);
break;
default:
if (!d->disable_direct_reg3_writes) {
d->devaddr = buf[1] & 0xf;
/* we support handlers:
* 1: Apple Standard Keyboard
* 2: Apple Extended Keyboard (LShift = RShift)
* 3: Apple Extended Keyboard (LShift != RShift)
*/
if (buf[2] == 1 || buf[2] == 2 || buf[2] == 3) {
d->handler = buf[2];
}
trace_adb_kbd_request_change_addr_and_handler(d->devaddr,
d->handler);
}
break;
}
}
break;
case ADB_READREG:
switch (reg) {
case 0:
olen = adb_kbd_poll(d, obuf);
break;
case 1:
break;
case 2:
obuf[0] = 0x00; /* XXX: check this */
obuf[1] = 0x07; /* led status */
olen = 2;
break;
case 3:
obuf[0] = d->devaddr;
obuf[1] = d->handler;
olen = 2;
break;
}
trace_adb_kbd_readreg(reg, obuf[0], obuf[1]);
break;
}
return olen;
}
/* This is where keyboard events enter this file */
static void adb_keyboard_event(DeviceState *dev, QemuConsole *src,
InputEvent *evt)
{
KBDState *s = (KBDState *)dev;
int qcode, keycode;
qcode = qemu_input_key_value_to_qcode(evt->u.key.data->key);
if (qcode >= ARRAY_SIZE(qcode_to_adb_keycode)) {
return;
}
/* FIXME: take handler into account when translating qcode */
keycode = qcode_to_adb_keycode[qcode];
if (keycode == NO_KEY) { /* We don't want to send this to the guest */
trace_adb_kbd_no_key();
return;
}
if (evt->u.key.data->down == false) { /* if key release event */
keycode = keycode | 0x80; /* create keyboard break code */
}
adb_kbd_put_keycode(s, keycode);
}
static const VMStateDescription vmstate_adb_kbd = {
.name = "adb_kbd",
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(parent_obj, KBDState, 0, vmstate_adb_device, ADBDevice),
VMSTATE_BUFFER(data, KBDState),
VMSTATE_INT32(rptr, KBDState),
VMSTATE_INT32(wptr, KBDState),
VMSTATE_INT32(count, KBDState),
VMSTATE_END_OF_LIST()
}
};
static void adb_kbd_reset(DeviceState *dev)
{
ADBDevice *d = ADB_DEVICE(dev);
KBDState *s = ADB_KEYBOARD(dev);
d->handler = 1;
d->devaddr = ADB_DEVID_KEYBOARD;
memset(s->data, 0, sizeof(s->data));
s->rptr = 0;
s->wptr = 0;
s->count = 0;
}
static QemuInputHandler adb_keyboard_handler = {
.name = "QEMU ADB Keyboard",
.mask = INPUT_EVENT_MASK_KEY,
.event = adb_keyboard_event,
};
static void adb_kbd_realizefn(DeviceState *dev, Error **errp)
{
ADBKeyboardClass *akc = ADB_KEYBOARD_GET_CLASS(dev);
akc->parent_realize(dev, errp);
qemu_input_handler_register(dev, &adb_keyboard_handler);
}
static void adb_kbd_initfn(Object *obj)
{
ADBDevice *d = ADB_DEVICE(obj);
d->devaddr = ADB_DEVID_KEYBOARD;
}
static void adb_kbd_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
ADBDeviceClass *adc = ADB_DEVICE_CLASS(oc);
ADBKeyboardClass *akc = ADB_KEYBOARD_CLASS(oc);
device_class_set_parent_realize(dc, adb_kbd_realizefn,
&akc->parent_realize);
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
adc->devreq = adb_kbd_request;
dc->reset = adb_kbd_reset;
dc->vmsd = &vmstate_adb_kbd;
}
static const TypeInfo adb_kbd_type_info = {
.name = TYPE_ADB_KEYBOARD,
.parent = TYPE_ADB_DEVICE,
.instance_size = sizeof(KBDState),
.instance_init = adb_kbd_initfn,
.class_init = adb_kbd_class_init,
.class_size = sizeof(ADBKeyboardClass),
};
static void adb_kbd_register_types(void)
{
type_register_static(&adb_kbd_type_info);
}
type_init(adb_kbd_register_types)
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