/*
* Copyright (C) 2010 The Android Open Source Project
* Copyright (C) 2012-14, The Linux Foundation. All rights reserved.
*
* Not a Contribution, Apache license notifications and license are
* retained for attribution purposes only.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define UEVENT_DEBUG 0
#include <hardware_legacy/uevent.h>
#include <utils/Log.h>
#include <sys/resource.h>
#include <sys/prctl.h>
#include <string.h>
#include <stdlib.h>
#include "hwc_utils.h"
#include "hwc_fbupdate.h"
#include "hwc_mdpcomp.h"
#include "hwc_copybit.h"
#include "comptype.h"
#include "hdmi.h"
#include "hwc_virtual.h"
#include "mdp_version.h"
using namespace overlay;
namespace qhwc {
#define HWC_UEVENT_SWITCH_STR "change@/devices/virtual/switch/"
#define HWC_UEVENT_THREAD_NAME "hwcUeventThread"
/* Parse uevent data for devices which we are interested */
static int getConnectedDisplay(hwc_context_t* ctx, const char* strUdata)
{
int ret = -1;
// Switch node for HDMI as PRIMARY/EXTERNAL
if(strcasestr("change@/devices/virtual/switch/hdmi", strUdata)) {
if (ctx->mHDMIDisplay->isHDMIPrimaryDisplay()) {
ret = HWC_DISPLAY_PRIMARY;
} else {
ret = HWC_DISPLAY_EXTERNAL;
}
}
return ret;
}
static bool getPanelResetStatus(hwc_context_t* ctx, const char* strUdata, int len)
{
const char* iter_str = strUdata;
if (strcasestr("change@/devices/virtual/graphics/fb0", strUdata)) {
while(((iter_str - strUdata) <= len) && (*iter_str)) {
char* pstr = strstr(iter_str, "PANEL_ALIVE=0");
if (pstr != NULL) {
ALOGI("%s: got change event in fb0 with PANEL_ALIVE=0",
__FUNCTION__);
ctx->mPanelResetStatus = true;
return true;
}
iter_str += strlen(iter_str)+1;
}
}
return false;
}
/* Parse uevent data for action requested for the display */
static int getConnectedState(const char* strUdata, int len)
{
const char* iter_str = strUdata;
while(((iter_str - strUdata) <= len) && (*iter_str)) {
char* pstr = strstr(iter_str, "SWITCH_STATE=");
if (pstr != NULL) {
return (atoi(pstr + strlen("SWITCH_STATE=")));
}
iter_str += strlen(iter_str)+1;
}
return -1;
}
static void handle_uevent(hwc_context_t* ctx, const char* udata, int len)
{
bool bpanelReset = getPanelResetStatus(ctx, udata, len);
if (bpanelReset) {
ctx->proc->invalidate(ctx->proc);
return;
}
int dpy = getConnectedDisplay(ctx, udata);
if(dpy < 0) {
ALOGD_IF(UEVENT_DEBUG, "%s: Not disp Event ", __FUNCTION__);
return;
}
int switch_state = getConnectedState(udata, len);
ALOGE_IF(UEVENT_DEBUG,"%s: uevent received: %s switch state: %d",
__FUNCTION__,udata, switch_state);
switch(switch_state) {
case EXTERNAL_OFFLINE:
{
/* Display not connected */
if(!ctx->dpyAttr[dpy].connected){
ALOGE_IF(UEVENT_DEBUG,"%s: Ignoring EXTERNAL_OFFLINE event"
"for display: %d", __FUNCTION__, dpy);
break;
}
ctx->mDrawLock.lock();
handle_offline(ctx, dpy);
ctx->mDrawLock.unlock();
/* We need to send hotplug to SF only when we are disconnecting
* HDMI as an external display. */
if(dpy == HWC_DISPLAY_EXTERNAL) {
ALOGE_IF(UEVENT_DEBUG,"%s:Sending EXTERNAL OFFLINE hotplug"
"event", __FUNCTION__);
ctx->proc->hotplug(ctx->proc, dpy, EXTERNAL_OFFLINE);
}
break;
}
case EXTERNAL_ONLINE:
{
/* Display already connected */
if(ctx->dpyAttr[dpy].connected) {
ALOGE_IF(UEVENT_DEBUG,"%s: Ignoring EXTERNAL_ONLINE event"
"for display: %d", __FUNCTION__, dpy);
break;
}
if (ctx->mHDMIDisplay->isHDMIPrimaryDisplay()) {
ctx->mDrawLock.lock();
handle_online(ctx, dpy);
ctx->mDrawLock.unlock();
ctx->proc->invalidate(ctx->proc);
break;
} else {
ctx->mDrawLock.lock();
//Force composition to give up resources like pipes and
//close fb. For example if assertive display is going on,
//fb2 could be open, thus connecting Layer Mixer#0 to
//WriteBack module. If HDMI attempts to open fb1, the driver
//will try to attach Layer Mixer#0 to HDMI INT, which will
//fail, since Layer Mixer#0 is still connected to WriteBack.
//This block will force composition to close fb2 in above
//example.
ctx->dpyAttr[dpy].isConfiguring = true;
ctx->mDrawLock.unlock();
ctx->proc->invalidate(ctx->proc);
}
//2 cycles for slower content
usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
* 2 / 1000);
if(isVDConnected(ctx)) {
// Do not initiate WFD teardown if WFD architecture is based
// on VDS mechanism.
// WFD Stack listens to HDMI intent and initiates virtual
// display teardown.
// ToDo: Currently non-WFD Virtual display clients do not
// involve HWC. If there is a change, we need to come up
// with mechanism of how to address non-WFD Virtual display
// clients + HDMI
ctx->mWfdSyncLock.lock();
ALOGD_IF(HWC_WFDDISPSYNC_LOG,
"%s: Waiting for wfd-teardown to be signalled",
__FUNCTION__);
ctx->mWfdSyncLock.wait();
ALOGD_IF(HWC_WFDDISPSYNC_LOG,
"%s: Teardown signalled. Completed waiting in"
"uevent thread", __FUNCTION__);
ctx->mWfdSyncLock.unlock();
}
ctx->mHDMIDisplay->configure();
ctx->mHDMIDisplay->activateDisplay();
ctx->mDrawLock.lock();
updateDisplayInfo(ctx, dpy);
initCompositionResources(ctx, dpy);
ctx->dpyAttr[dpy].isPause = false;
ctx->dpyAttr[dpy].connected = true;
ctx->dpyAttr[dpy].isConfiguring = true;
ctx->mDrawLock.unlock();
/* External display is HDMI */
ALOGE_IF(UEVENT_DEBUG, "%s: Sending EXTERNAL ONLINE"
"hotplug event", __FUNCTION__);
ctx->proc->hotplug(ctx->proc, dpy, EXTERNAL_ONLINE);
break;
}
default:
{
ALOGE("%s: Invalid state to swtich:%d", __FUNCTION__, switch_state);
break;
}
}
}
static void *uevent_loop(void *param)
{
int len = 0;
static char udata[PAGE_SIZE];
hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
char thread_name[64] = HWC_UEVENT_THREAD_NAME;
prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
if(!uevent_init()) {
ALOGE("%s: failed to init uevent ",__FUNCTION__);
return NULL;
}
while(1) {
len = uevent_next_event(udata, (int)sizeof(udata) - 2);
handle_uevent(ctx, udata, len);
}
return NULL;
}
void init_uevent_thread(hwc_context_t* ctx)
{
pthread_t uevent_thread;
int ret;
ALOGI("Initializing UEVENT Thread");
ret = pthread_create(&uevent_thread, NULL, uevent_loop, (void*) ctx);
if (ret) {
ALOGE("%s: failed to create %s: %s", __FUNCTION__,
HWC_UEVENT_THREAD_NAME, strerror(ret));
}
}
}; //namespace