msm8994/libhwcomposer/hwc_uevents.cpp - platform/hardware/qcom/display - Git at Google


 /*
  * 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

	/*
	* 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