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562f93754b
Coverity thinks the fallthroughs are smelly. They are correct, but everything else in this function is like "wut?". Refer explicitly to bits 8 and 9 of hs->kbd.modifiers instead of shifting right first and using (1 << 7). Document what the scancode is when hid_code is 0xe0. And add plenty of comments. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
612 lines
18 KiB
C
612 lines
18 KiB
C
/*
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* QEMU HID devices
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*
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* Copyright (c) 2005 Fabrice Bellard
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* Copyright (c) 2007 OpenMoko, Inc. (andrew@openedhand.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/hw.h"
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#include "ui/console.h"
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#include "qemu/timer.h"
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#include "hw/input/hid.h"
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#define HID_USAGE_ERROR_ROLLOVER 0x01
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#define HID_USAGE_POSTFAIL 0x02
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#define HID_USAGE_ERROR_UNDEFINED 0x03
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/* Indices are QEMU keycodes, values are from HID Usage Table. Indices
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* above 0x80 are for keys that come after 0xe0 or 0xe1+0x1d or 0xe1+0x9d. */
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static const uint8_t hid_usage_keys[0x100] = {
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0x00, 0x29, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x2d, 0x2e, 0x2a, 0x2b,
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0x14, 0x1a, 0x08, 0x15, 0x17, 0x1c, 0x18, 0x0c,
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0x12, 0x13, 0x2f, 0x30, 0x28, 0xe0, 0x04, 0x16,
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0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x0f, 0x33,
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0x34, 0x35, 0xe1, 0x31, 0x1d, 0x1b, 0x06, 0x19,
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0x05, 0x11, 0x10, 0x36, 0x37, 0x38, 0xe5, 0x55,
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0xe2, 0x2c, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
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0x3f, 0x40, 0x41, 0x42, 0x43, 0x53, 0x47, 0x5f,
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0x60, 0x61, 0x56, 0x5c, 0x5d, 0x5e, 0x57, 0x59,
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0x5a, 0x5b, 0x62, 0x63, 0x00, 0x00, 0x00, 0x44,
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0x45, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
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0xe8, 0xe9, 0x71, 0x72, 0x73, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x85, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x58, 0xe4, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x46,
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0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x4a,
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0x52, 0x4b, 0x00, 0x50, 0x00, 0x4f, 0x00, 0x4d,
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0x51, 0x4e, 0x49, 0x4c, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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};
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bool hid_has_events(HIDState *hs)
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{
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return hs->n > 0 || hs->idle_pending;
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}
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static void hid_idle_timer(void *opaque)
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{
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HIDState *hs = opaque;
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hs->idle_pending = true;
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hs->event(hs);
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}
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static void hid_del_idle_timer(HIDState *hs)
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{
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if (hs->idle_timer) {
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timer_del(hs->idle_timer);
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timer_free(hs->idle_timer);
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hs->idle_timer = NULL;
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}
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}
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void hid_set_next_idle(HIDState *hs)
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{
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if (hs->idle) {
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uint64_t expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
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get_ticks_per_sec() * hs->idle * 4 / 1000;
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if (!hs->idle_timer) {
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hs->idle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, hid_idle_timer, hs);
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}
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timer_mod_ns(hs->idle_timer, expire_time);
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} else {
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hid_del_idle_timer(hs);
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}
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}
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static void hid_pointer_event(DeviceState *dev, QemuConsole *src,
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InputEvent *evt)
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{
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static const int bmap[INPUT_BUTTON_MAX] = {
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[INPUT_BUTTON_LEFT] = 0x01,
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[INPUT_BUTTON_RIGHT] = 0x02,
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[INPUT_BUTTON_MIDDLE] = 0x04,
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};
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HIDState *hs = (HIDState *)dev;
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HIDPointerEvent *e;
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assert(hs->n < QUEUE_LENGTH);
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e = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK];
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switch (evt->kind) {
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case INPUT_EVENT_KIND_REL:
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if (evt->rel->axis == INPUT_AXIS_X) {
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e->xdx += evt->rel->value;
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} else if (evt->rel->axis == INPUT_AXIS_Y) {
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e->ydy += evt->rel->value;
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}
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break;
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case INPUT_EVENT_KIND_ABS:
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if (evt->rel->axis == INPUT_AXIS_X) {
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e->xdx = evt->rel->value;
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} else if (evt->rel->axis == INPUT_AXIS_Y) {
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e->ydy = evt->rel->value;
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}
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break;
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case INPUT_EVENT_KIND_BTN:
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if (evt->btn->down) {
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e->buttons_state |= bmap[evt->btn->button];
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if (evt->btn->button == INPUT_BUTTON_WHEEL_UP) {
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e->dz--;
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} else if (evt->btn->button == INPUT_BUTTON_WHEEL_DOWN) {
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e->dz++;
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}
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} else {
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e->buttons_state &= ~bmap[evt->btn->button];
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}
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break;
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default:
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/* keep gcc happy */
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break;
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}
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}
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static void hid_pointer_sync(DeviceState *dev)
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{
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HIDState *hs = (HIDState *)dev;
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HIDPointerEvent *prev, *curr, *next;
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bool event_compression = false;
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if (hs->n == QUEUE_LENGTH-1) {
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/*
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* Queue full. We are losing information, but we at least
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* keep track of most recent button state.
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*/
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return;
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}
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prev = &hs->ptr.queue[(hs->head + hs->n - 1) & QUEUE_MASK];
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curr = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK];
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next = &hs->ptr.queue[(hs->head + hs->n + 1) & QUEUE_MASK];
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if (hs->n > 0) {
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/*
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* No button state change between previous and current event
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* (and previous wasn't seen by the guest yet), so there is
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* motion information only and we can combine the two event
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* into one.
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*/
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if (curr->buttons_state == prev->buttons_state) {
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event_compression = true;
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}
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}
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if (event_compression) {
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/* add current motion to previous, clear current */
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if (hs->kind == HID_MOUSE) {
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prev->xdx += curr->xdx;
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curr->xdx = 0;
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prev->ydy += curr->ydy;
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curr->ydy = 0;
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} else {
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prev->xdx = curr->xdx;
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prev->ydy = curr->ydy;
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}
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prev->dz += curr->dz;
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curr->dz = 0;
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} else {
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/* prepate next (clear rel, copy abs + btns) */
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if (hs->kind == HID_MOUSE) {
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next->xdx = 0;
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next->ydy = 0;
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} else {
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next->xdx = curr->xdx;
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next->ydy = curr->ydy;
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}
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next->dz = 0;
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next->buttons_state = curr->buttons_state;
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/* make current guest visible, notify guest */
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hs->n++;
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hs->event(hs);
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}
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}
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static void hid_keyboard_event(DeviceState *dev, QemuConsole *src,
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InputEvent *evt)
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{
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HIDState *hs = (HIDState *)dev;
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int scancodes[3], i, count;
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int slot;
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count = qemu_input_key_value_to_scancode(evt->key->key,
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evt->key->down,
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scancodes);
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if (hs->n + count > QUEUE_LENGTH) {
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fprintf(stderr, "usb-kbd: warning: key event queue full\n");
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return;
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}
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for (i = 0; i < count; i++) {
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slot = (hs->head + hs->n) & QUEUE_MASK; hs->n++;
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hs->kbd.keycodes[slot] = scancodes[i];
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}
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hs->event(hs);
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}
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static void hid_keyboard_process_keycode(HIDState *hs)
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{
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uint8_t hid_code, index, key;
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int i, keycode, slot;
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if (hs->n == 0) {
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return;
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}
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slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--;
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keycode = hs->kbd.keycodes[slot];
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key = keycode & 0x7f;
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index = key | ((hs->kbd.modifiers & (1 << 8)) >> 1);
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hid_code = hid_usage_keys[index];
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hs->kbd.modifiers &= ~(1 << 8);
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switch (hid_code) {
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case 0x00:
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return;
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case 0xe0:
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assert(key == 0x1d);
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if (hs->kbd.modifiers & (1 << 9)) {
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/* The hid_codes for the 0xe1/0x1d scancode sequence are 0xe9/0xe0.
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* Here we're processing the second hid_code. By dropping bit 9
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* and setting bit 8, the scancode after 0x1d will access the
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* second half of the table.
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*/
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hs->kbd.modifiers ^= (1 << 8) | (1 << 9);
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return;
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}
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/* fall through to process Ctrl_L */
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case 0xe1 ... 0xe7:
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/* Ctrl_L/Ctrl_R, Shift_L/Shift_R, Alt_L/Alt_R, Win_L/Win_R.
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* Handle releases here, or fall through to process presses.
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*/
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if (keycode & (1 << 7)) {
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hs->kbd.modifiers &= ~(1 << (hid_code & 0x0f));
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return;
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}
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/* fall through */
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case 0xe8 ... 0xe9:
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/* USB modifiers are just 1 byte long. Bits 8 and 9 of
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* hs->kbd.modifiers implement a state machine that detects the
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* 0xe0 and 0xe1/0x1d sequences. These bits do not follow the
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* usual rules where bit 7 marks released keys; they are cleared
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* elsewhere in the function as the state machine dictates.
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*/
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hs->kbd.modifiers |= 1 << (hid_code & 0x0f);
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return;
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case 0xea ... 0xef:
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abort();
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default:
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break;
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}
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if (keycode & (1 << 7)) {
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for (i = hs->kbd.keys - 1; i >= 0; i--) {
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if (hs->kbd.key[i] == hid_code) {
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hs->kbd.key[i] = hs->kbd.key[-- hs->kbd.keys];
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hs->kbd.key[hs->kbd.keys] = 0x00;
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break;
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}
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}
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if (i < 0) {
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return;
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}
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} else {
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for (i = hs->kbd.keys - 1; i >= 0; i--) {
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if (hs->kbd.key[i] == hid_code) {
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break;
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}
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}
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if (i < 0) {
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if (hs->kbd.keys < sizeof(hs->kbd.key)) {
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hs->kbd.key[hs->kbd.keys++] = hid_code;
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}
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} else {
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return;
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}
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}
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}
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static inline int int_clamp(int val, int vmin, int vmax)
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{
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if (val < vmin) {
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return vmin;
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} else if (val > vmax) {
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return vmax;
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} else {
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return val;
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}
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}
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void hid_pointer_activate(HIDState *hs)
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{
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if (!hs->ptr.mouse_grabbed) {
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qemu_input_handler_activate(hs->s);
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hs->ptr.mouse_grabbed = 1;
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}
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}
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int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)
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{
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int dx, dy, dz, l;
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int index;
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HIDPointerEvent *e;
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hs->idle_pending = false;
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hid_pointer_activate(hs);
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/* When the buffer is empty, return the last event. Relative
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movements will all be zero. */
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index = (hs->n ? hs->head : hs->head - 1);
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e = &hs->ptr.queue[index & QUEUE_MASK];
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if (hs->kind == HID_MOUSE) {
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dx = int_clamp(e->xdx, -127, 127);
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dy = int_clamp(e->ydy, -127, 127);
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e->xdx -= dx;
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e->ydy -= dy;
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} else {
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dx = e->xdx;
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dy = e->ydy;
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}
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dz = int_clamp(e->dz, -127, 127);
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e->dz -= dz;
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if (hs->n &&
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!e->dz &&
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(hs->kind == HID_TABLET || (!e->xdx && !e->ydy))) {
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/* that deals with this event */
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QUEUE_INCR(hs->head);
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hs->n--;
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}
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/* Appears we have to invert the wheel direction */
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dz = 0 - dz;
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l = 0;
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switch (hs->kind) {
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case HID_MOUSE:
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if (len > l) {
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buf[l++] = e->buttons_state;
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}
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if (len > l) {
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buf[l++] = dx;
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}
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if (len > l) {
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buf[l++] = dy;
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}
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if (len > l) {
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buf[l++] = dz;
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}
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break;
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case HID_TABLET:
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if (len > l) {
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buf[l++] = e->buttons_state;
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}
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if (len > l) {
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buf[l++] = dx & 0xff;
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}
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if (len > l) {
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buf[l++] = dx >> 8;
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}
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if (len > l) {
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buf[l++] = dy & 0xff;
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}
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if (len > l) {
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buf[l++] = dy >> 8;
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}
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if (len > l) {
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buf[l++] = dz;
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}
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break;
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default:
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abort();
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}
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return l;
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}
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int hid_keyboard_poll(HIDState *hs, uint8_t *buf, int len)
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{
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hs->idle_pending = false;
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if (len < 2) {
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return 0;
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}
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hid_keyboard_process_keycode(hs);
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buf[0] = hs->kbd.modifiers & 0xff;
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buf[1] = 0;
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if (hs->kbd.keys > 6) {
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memset(buf + 2, HID_USAGE_ERROR_ROLLOVER, MIN(8, len) - 2);
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} else {
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memcpy(buf + 2, hs->kbd.key, MIN(8, len) - 2);
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}
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return MIN(8, len);
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}
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int hid_keyboard_write(HIDState *hs, uint8_t *buf, int len)
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{
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if (len > 0) {
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int ledstate = 0;
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/* 0x01: Num Lock LED
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* 0x02: Caps Lock LED
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* 0x04: Scroll Lock LED
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* 0x08: Compose LED
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* 0x10: Kana LED */
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hs->kbd.leds = buf[0];
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if (hs->kbd.leds & 0x04) {
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ledstate |= QEMU_SCROLL_LOCK_LED;
|
|
}
|
|
if (hs->kbd.leds & 0x01) {
|
|
ledstate |= QEMU_NUM_LOCK_LED;
|
|
}
|
|
if (hs->kbd.leds & 0x02) {
|
|
ledstate |= QEMU_CAPS_LOCK_LED;
|
|
}
|
|
kbd_put_ledstate(ledstate);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void hid_reset(HIDState *hs)
|
|
{
|
|
switch (hs->kind) {
|
|
case HID_KEYBOARD:
|
|
memset(hs->kbd.keycodes, 0, sizeof(hs->kbd.keycodes));
|
|
memset(hs->kbd.key, 0, sizeof(hs->kbd.key));
|
|
hs->kbd.keys = 0;
|
|
break;
|
|
case HID_MOUSE:
|
|
case HID_TABLET:
|
|
memset(hs->ptr.queue, 0, sizeof(hs->ptr.queue));
|
|
break;
|
|
}
|
|
hs->head = 0;
|
|
hs->n = 0;
|
|
hs->protocol = 1;
|
|
hs->idle = 0;
|
|
hs->idle_pending = false;
|
|
hid_del_idle_timer(hs);
|
|
}
|
|
|
|
void hid_free(HIDState *hs)
|
|
{
|
|
qemu_input_handler_unregister(hs->s);
|
|
hid_del_idle_timer(hs);
|
|
}
|
|
|
|
static QemuInputHandler hid_keyboard_handler = {
|
|
.name = "QEMU HID Keyboard",
|
|
.mask = INPUT_EVENT_MASK_KEY,
|
|
.event = hid_keyboard_event,
|
|
};
|
|
|
|
static QemuInputHandler hid_mouse_handler = {
|
|
.name = "QEMU HID Mouse",
|
|
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
|
|
.event = hid_pointer_event,
|
|
.sync = hid_pointer_sync,
|
|
};
|
|
|
|
static QemuInputHandler hid_tablet_handler = {
|
|
.name = "QEMU HID Tablet",
|
|
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
|
|
.event = hid_pointer_event,
|
|
.sync = hid_pointer_sync,
|
|
};
|
|
|
|
void hid_init(HIDState *hs, int kind, HIDEventFunc event)
|
|
{
|
|
hs->kind = kind;
|
|
hs->event = event;
|
|
|
|
if (hs->kind == HID_KEYBOARD) {
|
|
hs->s = qemu_input_handler_register((DeviceState *)hs,
|
|
&hid_keyboard_handler);
|
|
qemu_input_handler_activate(hs->s);
|
|
} else if (hs->kind == HID_MOUSE) {
|
|
hs->s = qemu_input_handler_register((DeviceState *)hs,
|
|
&hid_mouse_handler);
|
|
} else if (hs->kind == HID_TABLET) {
|
|
hs->s = qemu_input_handler_register((DeviceState *)hs,
|
|
&hid_tablet_handler);
|
|
}
|
|
}
|
|
|
|
static int hid_post_load(void *opaque, int version_id)
|
|
{
|
|
HIDState *s = opaque;
|
|
|
|
hid_set_next_idle(s);
|
|
|
|
if (s->n == QUEUE_LENGTH && (s->kind == HID_TABLET ||
|
|
s->kind == HID_MOUSE)) {
|
|
/*
|
|
* Handle ptr device migration from old qemu with full queue.
|
|
*
|
|
* Throw away everything but the last event, so we propagate
|
|
* at least the current button state to the guest. Also keep
|
|
* current position for the tablet, signal "no motion" for the
|
|
* mouse.
|
|
*/
|
|
HIDPointerEvent evt;
|
|
evt = s->ptr.queue[(s->head+s->n) & QUEUE_MASK];
|
|
if (s->kind == HID_MOUSE) {
|
|
evt.xdx = 0;
|
|
evt.ydy = 0;
|
|
}
|
|
s->ptr.queue[0] = evt;
|
|
s->head = 0;
|
|
s->n = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_hid_ptr_queue = {
|
|
.name = "HIDPointerEventQueue",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_INT32(xdx, HIDPointerEvent),
|
|
VMSTATE_INT32(ydy, HIDPointerEvent),
|
|
VMSTATE_INT32(dz, HIDPointerEvent),
|
|
VMSTATE_INT32(buttons_state, HIDPointerEvent),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
const VMStateDescription vmstate_hid_ptr_device = {
|
|
.name = "HIDPointerDevice",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.post_load = hid_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_STRUCT_ARRAY(ptr.queue, HIDState, QUEUE_LENGTH, 0,
|
|
vmstate_hid_ptr_queue, HIDPointerEvent),
|
|
VMSTATE_UINT32(head, HIDState),
|
|
VMSTATE_UINT32(n, HIDState),
|
|
VMSTATE_INT32(protocol, HIDState),
|
|
VMSTATE_UINT8(idle, HIDState),
|
|
VMSTATE_END_OF_LIST(),
|
|
}
|
|
};
|
|
|
|
const VMStateDescription vmstate_hid_keyboard_device = {
|
|
.name = "HIDKeyboardDevice",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.post_load = hid_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32_ARRAY(kbd.keycodes, HIDState, QUEUE_LENGTH),
|
|
VMSTATE_UINT32(head, HIDState),
|
|
VMSTATE_UINT32(n, HIDState),
|
|
VMSTATE_UINT16(kbd.modifiers, HIDState),
|
|
VMSTATE_UINT8(kbd.leds, HIDState),
|
|
VMSTATE_UINT8_ARRAY(kbd.key, HIDState, 16),
|
|
VMSTATE_INT32(kbd.keys, HIDState),
|
|
VMSTATE_INT32(protocol, HIDState),
|
|
VMSTATE_UINT8(idle, HIDState),
|
|
VMSTATE_END_OF_LIST(),
|
|
}
|
|
};
|