libgralloc/framebuffer.cpp - platform/vendor/qcom-opensource/display-commonsys-intf - Gitiles

 /*
  * Copyright (C) 2008 The Android Open Source Project
  * Copyright (c) 2010-2012 The Linux Foundation. All rights reserved.
  *
  * 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.
  */

 #include <sys/mman.h>

 #include <cutils/log.h>
 #include <cutils/properties.h>
 #include <dlfcn.h>

 #include <hardware/hardware.h>

 #include <fcntl.h>
 #include <errno.h>
 #include <sys/ioctl.h>
 #include <string.h>
 #include <stdlib.h>
 #include <pthread.h>
 #include <cutils/atomic.h>

 #include <linux/fb.h>
 #include <linux/msm_mdp.h>

 #include <GLES/gl.h>

 #include "gralloc_priv.h"
 #include "fb_priv.h"
 #include "gr.h"
 #include <cutils/properties.h>
 #include <profiler.h>

 #define EVEN_OUT(x) if (x & 0x0001) {x--;}
 /** min of int a, b */
 static inline int min(int a, int b) {
     return (a<b) ? a : b;
 }
 /** max of int a, b */
 static inline int max(int a, int b) {
     return (a>b) ? a : b;
 }

 enum {
     PAGE_FLIP = 0x00000001,
 };

 struct fb_context_t {
     framebuffer_device_t  device;
 };


 static int fb_setSwapInterval(struct framebuffer_device_t* dev,
                               int interval)
 {
     //XXX: Get the value here and implement along with
     //single vsync in HWC
     char pval[PROPERTY_VALUE_MAX];
     property_get("debug.egl.swapinterval", pval, "-1");
     int property_interval = atoi(pval);
     if (property_interval >= 0)
         interval = property_interval;

     fb_context_t* ctx = (fb_context_t*)dev;
     private_module_t* m = reinterpret_cast<private_module_t*>(
         dev->common.module);
     if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
         return -EINVAL;

     m->swapInterval = interval;
     return 0;
 }

 static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
 {
     private_module_t* m =
         reinterpret_cast<private_module_t*>(dev->common.module);
     private_handle_t *hnd = static_cast<private_handle_t*>
         (const_cast<native_handle_t*>(buffer));
     const size_t offset = hnd->base - m->framebuffer->base;
     m->info.activate = FB_ACTIVATE_VBL;
     m->info.yoffset = offset / m->finfo.line_length;
     if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
         ALOGE("%s: FBIOPUT_VSCREENINFO for primary failed, str: %s",
                 __FUNCTION__, strerror(errno));
         return -errno;
     }
     return 0;
 }

 static int fb_compositionComplete(struct framebuffer_device_t* dev)
 {
     // TODO: Properly implement composition complete callback
     glFinish();

     return 0;
 }

 int mapFrameBufferLocked(struct private_module_t* module)
 {
     // already initialized...
     if (module->framebuffer) {
         return 0;
     }
     char const * const device_template[] = {
         "/dev/graphics/fb%u",
         "/dev/fb%u",
         0 };

     int fd = -1;
     int i=0;
     char name[64];
     char property[PROPERTY_VALUE_MAX];

     while ((fd==-1) && device_template[i]) {
         snprintf(name, 64, device_template[i], 0);
         fd = open(name, O_RDWR, 0);
         i++;
     }
     if (fd < 0)
         return -errno;

     memset(&module->commit, 0, sizeof(struct mdp_display_commit));

     struct fb_fix_screeninfo finfo;
     if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
         return -errno;

     struct fb_var_screeninfo info;
     if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
         return -errno;

     info.reserved[0] = 0;
     info.reserved[1] = 0;
     info.reserved[2] = 0;
     info.xoffset = 0;
     info.yoffset = 0;
     info.activate = FB_ACTIVATE_NOW;

     /* Interpretation of offset for color fields: All offsets are from the
      * right, inside a "pixel" value, which is exactly 'bits_per_pixel' wide
      * (means: you can use the offset as right argument to <<). A pixel
      * afterwards is a bit stream and is written to video memory as that
      * unmodified. This implies big-endian byte order if bits_per_pixel is
      * greater than 8.
      */

     if(info.bits_per_pixel == 32) {
         /*
          * Explicitly request RGBA_8888
          */
         info.bits_per_pixel = 32;
         info.red.offset     = 24;
         info.red.length     = 8;
         info.green.offset   = 16;
         info.green.length   = 8;
         info.blue.offset    = 8;
         info.blue.length    = 8;
         info.transp.offset  = 0;
         info.transp.length  = 8;

         /* Note: the GL driver does not have a r=8 g=8 b=8 a=0 config, so if we
          * do not use the MDP for composition (i.e. hw composition == 0), ask
          * for RGBA instead of RGBX. */
         if (property_get("debug.sf.hw", property, NULL) > 0 &&
                                                            atoi(property) == 0)
             module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
         else if(property_get("debug.composition.type", property, NULL) > 0 &&
                 (strncmp(property, "mdp", 3) == 0))
             module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
         else
             module->fbFormat = HAL_PIXEL_FORMAT_RGBA_8888;
     } else {
         /*
          * Explicitly request 5/6/5
          */
         info.bits_per_pixel = 16;
         info.red.offset     = 11;
         info.red.length     = 5;
         info.green.offset   = 5;
         info.green.length   = 6;
         info.blue.offset    = 0;
         info.blue.length    = 5;
         info.transp.offset  = 0;
         info.transp.length  = 0;
         module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
     }

     //adreno needs 4k aligned offsets. Max hole size is 4096-1
     int  size = roundUpToPageSize(info.yres * info.xres *
                                                        (info.bits_per_pixel/8));

     /*
      * Request NUM_BUFFERS screens (at least 2 for page flipping)
      */
     int numberOfBuffers = (int)(finfo.smem_len/size);
     ALOGV("num supported framebuffers in kernel = %d", numberOfBuffers);

     if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
         int num = atoi(property);
         if ((num >= NUM_FRAMEBUFFERS_MIN) && (num <= NUM_FRAMEBUFFERS_MAX)) {
             numberOfBuffers = num;
         }
     }
     if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
         numberOfBuffers = NUM_FRAMEBUFFERS_MAX;

     ALOGV("We support %d buffers", numberOfBuffers);

     //consider the included hole by 4k alignment
     uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
     info.yres_virtual = (size * numberOfBuffers) / line_length;

     uint32_t flags = PAGE_FLIP;

     if (info.yres_virtual < ((size * 2) / line_length) ) {
         // we need at least 2 for page-flipping
         info.yres_virtual = size / line_length;
         flags &= ~PAGE_FLIP;
         ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
               info.yres_virtual, info.yres*2);
     }

     if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
         return -errno;

     if (int(info.width) <= 0 || int(info.height) <= 0) {
         // the driver doesn't return that information
         // default to 160 dpi
         info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
         info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
     }

     float xdpi = (info.xres * 25.4f) / info.width;
     float ydpi = (info.yres * 25.4f) / info.height;
 #ifdef MSMFB_METADATA_GET
     struct msmfb_metadata metadata;
     memset(&metadata, 0 , sizeof(metadata));
     metadata.op = metadata_op_frame_rate;
     if (ioctl(fd, MSMFB_METADATA_GET, &metadata) == -1) {
         ALOGE("Error retrieving panel frame rate");
         return -errno;
     }
     float fps  = metadata.data.panel_frame_rate;
 #else
     //XXX: Remove reserved field usage on all baselines
     //The reserved[3] field is used to store FPS by the driver.
     float fps  = info.reserved[3] & 0xFF;
 #endif
     ALOGI("using (fd=%d)\n"
           "id           = %s\n"
           "xres         = %d px\n"
           "yres         = %d px\n"
           "xres_virtual = %d px\n"
           "yres_virtual = %d px\n"
           "bpp          = %d\n"
           "r            = %2u:%u\n"
           "g            = %2u:%u\n"
           "b            = %2u:%u\n",
           fd,
           finfo.id,
           info.xres,
           info.yres,
           info.xres_virtual,
           info.yres_virtual,
           info.bits_per_pixel,
           info.red.offset, info.red.length,
           info.green.offset, info.green.length,
           info.blue.offset, info.blue.length
          );

     ALOGI("width        = %d mm (%f dpi)\n"
           "height       = %d mm (%f dpi)\n"
           "refresh rate = %.2f Hz\n",
           info.width,  xdpi,
           info.height, ydpi,
           fps
          );


     if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
         return -errno;

     if (finfo.smem_len <= 0)
         return -errno;

     module->flags = flags;
     module->info = info;
     module->finfo = finfo;
     module->xdpi = xdpi;
     module->ydpi = ydpi;
     module->fps = fps;
     module->swapInterval = 1;

     CALC_INIT();

     /*
      * map the framebuffer
      */

     int err;
     module->numBuffers = info.yres_virtual / info.yres;
     module->bufferMask = 0;
     //adreno needs page aligned offsets. Align the fbsize to pagesize.
     size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres)*
                     module->numBuffers;
     module->framebuffer = new private_handle_t(fd, fbSize,
                                         private_handle_t::PRIV_FLAGS_USES_ION,
                                         BUFFER_TYPE_UI,
                                         module->fbFormat, info.xres, info.yres);
     void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
     if (vaddr == MAP_FAILED) {
         ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
         return -errno;
     }
     module->framebuffer->base = intptr_t(vaddr);
     memset(vaddr, 0, fbSize);
     module->currentOffset = 0;
     //Enable vsync
     int enable = 1;
     ioctl(module->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL,
              &enable);
     return 0;
 }

 static int mapFrameBuffer(struct private_module_t* module)
 {
     pthread_mutex_lock(&module->lock);
     int err = mapFrameBufferLocked(module);
     pthread_mutex_unlock(&module->lock);
     return err;
 }

 /*****************************************************************************/

 static int fb_close(struct hw_device_t *dev)
 {
     fb_context_t* ctx = (fb_context_t*)dev;
     if (ctx) {
         //Hack until fbdev is removed. Framework could close this causing hwc a
         //pain.
         //free(ctx);
     }
     return 0;
 }

 int fb_device_open(hw_module_t const* module, const char* name,
                    hw_device_t** device)
 {
     int status = -EINVAL;
     if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
         alloc_device_t* gralloc_device;
         status = gralloc_open(module, &gralloc_device);
         if (status < 0)
             return status;

         /* initialize our state here */
         fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
         memset(dev, 0, sizeof(*dev));

         /* initialize the procs */
         dev->device.common.tag      = HARDWARE_DEVICE_TAG;
         dev->device.common.version  = 0;
         dev->device.common.module   = const_cast<hw_module_t*>(module);
         dev->device.common.close    = fb_close;
         dev->device.setSwapInterval = fb_setSwapInterval;
         dev->device.post            = fb_post;
         dev->device.setUpdateRect   = 0;
         dev->device.compositionComplete = fb_compositionComplete;

         private_module_t* m = (private_module_t*)module;
         status = mapFrameBuffer(m);
         if (status >= 0) {
             int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
             const_cast<uint32_t&>(dev->device.flags) = 0;
             const_cast<uint32_t&>(dev->device.width) = m->info.xres;
             const_cast<uint32_t&>(dev->device.height) = m->info.yres;
             const_cast<int&>(dev->device.stride) = stride;
             const_cast<int&>(dev->device.format) = m->fbFormat;
             const_cast<float&>(dev->device.xdpi) = m->xdpi;
             const_cast<float&>(dev->device.ydpi) = m->ydpi;
             const_cast<float&>(dev->device.fps) = m->fps;
             const_cast<int&>(dev->device.minSwapInterval) =
                                                         PRIV_MIN_SWAP_INTERVAL;
             const_cast<int&>(dev->device.maxSwapInterval) =
                                                         PRIV_MAX_SWAP_INTERVAL;
             const_cast<int&>(dev->device.numFramebuffers) = m->numBuffers;
             dev->device.setUpdateRect = 0;

             *device = &dev->device.common;
         }

         // Close the gralloc module
         gralloc_close(gralloc_device);
     }
     return status;
 }
	/*
	* Copyright (C) 2008 The Android Open Source Project
	* Copyright (c) 2010-2012 The Linux Foundation. All rights reserved.
	*
	* 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.
	*/

	#include <sys/mman.h>

	#include <cutils/log.h>
	#include <cutils/properties.h>
	#include <dlfcn.h>

	#include <hardware/hardware.h>

	#include <fcntl.h>
	#include <errno.h>
	#include <sys/ioctl.h>
	#include <string.h>
	#include <stdlib.h>
	#include <pthread.h>
	#include <cutils/atomic.h>

	#include <linux/fb.h>
	#include <linux/msm_mdp.h>

	#include <GLES/gl.h>

	#include "gralloc_priv.h"
	#include "fb_priv.h"
	#include "gr.h"
	#include <cutils/properties.h>
	#include <profiler.h>

	#define EVEN_OUT(x) if (x & 0x0001) {x--;}
	/** min of int a, b */
	static inline int min(int a, int b) {
	return (a<b) ? a : b;
	}
	/** max of int a, b */
	static inline int max(int a, int b) {
	return (a>b) ? a : b;
	}

	enum {
	PAGE_FLIP = 0x00000001,
	};

	struct fb_context_t {
	framebuffer_device_t device;
	};


	static int fb_setSwapInterval(struct framebuffer_device_t* dev,
	int interval)
	{
	//XXX: Get the value here and implement along with
	//single vsync in HWC
	char pval[PROPERTY_VALUE_MAX];
	property_get("debug.egl.swapinterval", pval, "-1");
	int property_interval = atoi(pval);
	if (property_interval >= 0)
	interval = property_interval;

	fb_context_t* ctx = (fb_context_t*)dev;
	private_module_t* m = reinterpret_cast<private_module_t*>(
	dev->common.module);
	if (interval < dev->minSwapInterval \|\| interval > dev->maxSwapInterval)
	return -EINVAL;

	m->swapInterval = interval;
	return 0;
	}

	static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
	{
	private_module_t* m =
	reinterpret_cast<private_module_t*>(dev->common.module);
	private_handle_t hnd = static_cast<private_handle_t>
	(const_cast<native_handle_t*>(buffer));
	const size_t offset = hnd->base - m->framebuffer->base;
	m->info.activate = FB_ACTIVATE_VBL;
	m->info.yoffset = offset / m->finfo.line_length;
	if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
	ALOGE("%s: FBIOPUT_VSCREENINFO for primary failed, str: %s",
	__FUNCTION__, strerror(errno));
	return -errno;
	}
	return 0;
	}

	static int fb_compositionComplete(struct framebuffer_device_t* dev)
	{
	// TODO: Properly implement composition complete callback
	glFinish();

	return 0;
	}

	int mapFrameBufferLocked(struct private_module_t* module)
	{
	// already initialized...
	if (module->framebuffer) {
	return 0;
	}
	char const * const device_template[] = {
	"/dev/graphics/fb%u",
	"/dev/fb%u",
	0 };

	int fd = -1;
	int i=0;
	char name[64];
	char property[PROPERTY_VALUE_MAX];

	while ((fd==-1) && device_template[i]) {
	snprintf(name, 64, device_template[i], 0);
	fd = open(name, O_RDWR, 0);
	i++;
	}
	if (fd < 0)
	return -errno;

	memset(&module->commit, 0, sizeof(struct mdp_display_commit));

	struct fb_fix_screeninfo finfo;
	if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
	return -errno;

	struct fb_var_screeninfo info;
	if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
	return -errno;

	info.reserved[0] = 0;
	info.reserved[1] = 0;
	info.reserved[2] = 0;
	info.xoffset = 0;
	info.yoffset = 0;
	info.activate = FB_ACTIVATE_NOW;

	/* Interpretation of offset for color fields: All offsets are from the
	* right, inside a "pixel" value, which is exactly 'bits_per_pixel' wide
	* (means: you can use the offset as right argument to <<). A pixel
	* afterwards is a bit stream and is written to video memory as that
	* unmodified. This implies big-endian byte order if bits_per_pixel is
	* greater than 8.
	*/

	if(info.bits_per_pixel == 32) {
	/*
	* Explicitly request RGBA_8888
	*/
	info.bits_per_pixel = 32;
	info.red.offset = 24;
	info.red.length = 8;
	info.green.offset = 16;
	info.green.length = 8;
	info.blue.offset = 8;
	info.blue.length = 8;
	info.transp.offset = 0;
	info.transp.length = 8;

	/* Note: the GL driver does not have a r=8 g=8 b=8 a=0 config, so if we
	* do not use the MDP for composition (i.e. hw composition == 0), ask
	* for RGBA instead of RGBX. */
	if (property_get("debug.sf.hw", property, NULL) > 0 &&
	atoi(property) == 0)
	module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
	else if(property_get("debug.composition.type", property, NULL) > 0 &&
	(strncmp(property, "mdp", 3) == 0))
	module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
	else
	module->fbFormat = HAL_PIXEL_FORMAT_RGBA_8888;
	} else {
	/*
	* Explicitly request 5/6/5
	*/
	info.bits_per_pixel = 16;
	info.red.offset = 11;
	info.red.length = 5;
	info.green.offset = 5;
	info.green.length = 6;
	info.blue.offset = 0;
	info.blue.length = 5;
	info.transp.offset = 0;
	info.transp.length = 0;
	module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
	}

	//adreno needs 4k aligned offsets. Max hole size is 4096-1
	int size = roundUpToPageSize(info.yres * info.xres *
	(info.bits_per_pixel/8));

	/*
	* Request NUM_BUFFERS screens (at least 2 for page flipping)
	*/
	int numberOfBuffers = (int)(finfo.smem_len/size);
	ALOGV("num supported framebuffers in kernel = %d", numberOfBuffers);

	if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
	int num = atoi(property);
	if ((num >= NUM_FRAMEBUFFERS_MIN) && (num <= NUM_FRAMEBUFFERS_MAX)) {
	numberOfBuffers = num;
	}
	}
	if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
	numberOfBuffers = NUM_FRAMEBUFFERS_MAX;

	ALOGV("We support %d buffers", numberOfBuffers);

	//consider the included hole by 4k alignment
	uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
	info.yres_virtual = (size * numberOfBuffers) / line_length;

	uint32_t flags = PAGE_FLIP;

	if (info.yres_virtual < ((size * 2) / line_length) ) {
	// we need at least 2 for page-flipping
	info.yres_virtual = size / line_length;
	flags &= ~PAGE_FLIP;
	ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
	info.yres_virtual, info.yres*2);
	}

	if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
	return -errno;

	if (int(info.width) <= 0 \|\| int(info.height) <= 0) {
	// the driver doesn't return that information
	// default to 160 dpi
	info.width = ((info.xres * 25.4f)/160.0f + 0.5f);
	info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
	}

	float xdpi = (info.xres * 25.4f) / info.width;
	float ydpi = (info.yres * 25.4f) / info.height;
	#ifdef MSMFB_METADATA_GET
	struct msmfb_metadata metadata;
	memset(&metadata, 0 , sizeof(metadata));
	metadata.op = metadata_op_frame_rate;
	if (ioctl(fd, MSMFB_METADATA_GET, &metadata) == -1) {
	ALOGE("Error retrieving panel frame rate");
	return -errno;
	}
	float fps = metadata.data.panel_frame_rate;
	#else
	//XXX: Remove reserved field usage on all baselines
	//The reserved[3] field is used to store FPS by the driver.
	float fps = info.reserved[3] & 0xFF;
	#endif
	ALOGI("using (fd=%d)\n"
	"id = %s\n"
	"xres = %d px\n"
	"yres = %d px\n"
	"xres_virtual = %d px\n"
	"yres_virtual = %d px\n"
	"bpp = %d\n"
	"r = %2u:%u\n"
	"g = %2u:%u\n"
	"b = %2u:%u\n",
	fd,
	finfo.id,
	info.xres,
	info.yres,
	info.xres_virtual,
	info.yres_virtual,
	info.bits_per_pixel,
	info.red.offset, info.red.length,
	info.green.offset, info.green.length,
	info.blue.offset, info.blue.length
	);

	ALOGI("width = %d mm (%f dpi)\n"
	"height = %d mm (%f dpi)\n"
	"refresh rate = %.2f Hz\n",
	info.width, xdpi,
	info.height, ydpi,
	fps
	);


	if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
	return -errno;

	if (finfo.smem_len <= 0)
	return -errno;

	module->flags = flags;
	module->info = info;
	module->finfo = finfo;
	module->xdpi = xdpi;
	module->ydpi = ydpi;
	module->fps = fps;
	module->swapInterval = 1;

	CALC_INIT();

	/*
	* map the framebuffer
	*/

	int err;
	module->numBuffers = info.yres_virtual / info.yres;
	module->bufferMask = 0;
	//adreno needs page aligned offsets. Align the fbsize to pagesize.
	size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres)*
	module->numBuffers;
	module->framebuffer = new private_handle_t(fd, fbSize,
	private_handle_t::PRIV_FLAGS_USES_ION,
	BUFFER_TYPE_UI,
	module->fbFormat, info.xres, info.yres);
	void* vaddr = mmap(0, fbSize, PROT_READ\|PROT_WRITE, MAP_SHARED, fd, 0);
	if (vaddr == MAP_FAILED) {
	ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
	return -errno;
	}
	module->framebuffer->base = intptr_t(vaddr);
	memset(vaddr, 0, fbSize);
	module->currentOffset = 0;
	//Enable vsync
	int enable = 1;
	ioctl(module->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL,
	&enable);
	return 0;
	}

	static int mapFrameBuffer(struct private_module_t* module)
	{
	pthread_mutex_lock(&module->lock);
	int err = mapFrameBufferLocked(module);
	pthread_mutex_unlock(&module->lock);
	return err;
	}

	/*****************************************************************************/

	static int fb_close(struct hw_device_t *dev)
	{
	fb_context_t* ctx = (fb_context_t*)dev;
	if (ctx) {
	//Hack until fbdev is removed. Framework could close this causing hwc a
	//pain.
	//free(ctx);
	}
	return 0;
	}

	int fb_device_open(hw_module_t const* module, const char* name,
	hw_device_t** device)
	{
	int status = -EINVAL;
	if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
	alloc_device_t* gralloc_device;
	status = gralloc_open(module, &gralloc_device);
	if (status < 0)
	return status;

	/* initialize our state here */
	fb_context_t dev = (fb_context_t)malloc(sizeof(*dev));
	memset(dev, 0, sizeof(*dev));

	/* initialize the procs */
	dev->device.common.tag = HARDWARE_DEVICE_TAG;
	dev->device.common.version = 0;
	dev->device.common.module = const_cast<hw_module_t*>(module);
	dev->device.common.close = fb_close;
	dev->device.setSwapInterval = fb_setSwapInterval;
	dev->device.post = fb_post;
	dev->device.setUpdateRect = 0;
	dev->device.compositionComplete = fb_compositionComplete;

	private_module_t* m = (private_module_t*)module;
	status = mapFrameBuffer(m);
	if (status >= 0) {
	int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
	const_cast<uint32_t&>(dev->device.flags) = 0;
	const_cast<uint32_t&>(dev->device.width) = m->info.xres;
	const_cast<uint32_t&>(dev->device.height) = m->info.yres;
	const_cast<int&>(dev->device.stride) = stride;
	const_cast<int&>(dev->device.format) = m->fbFormat;
	const_cast<float&>(dev->device.xdpi) = m->xdpi;
	const_cast<float&>(dev->device.ydpi) = m->ydpi;
	const_cast<float&>(dev->device.fps) = m->fps;
	const_cast<int&>(dev->device.minSwapInterval) =
	PRIV_MIN_SWAP_INTERVAL;
	const_cast<int&>(dev->device.maxSwapInterval) =
	PRIV_MAX_SWAP_INTERVAL;
	const_cast<int&>(dev->device.numFramebuffers) = m->numBuffers;
	dev->device.setUpdateRect = 0;

	*device = &dev->device.common;
	}

	// Close the gralloc module
	gralloc_close(gralloc_device);
	}
	return status;
	}