auto import from //depot/cupcake/@135843

12 files changed, 1729 insertions, 0 deletions

diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..b2e9caf
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,35 @@
+# Copyright 2006 The Android Open Source Project
+
+# Setting LOCAL_PATH will mess up all-subdir-makefiles, so do it beforehand.
+SAVE_MAKEFILES := $(call all-subdir-makefiles)
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SHARED_LIBRARIES := libcutils
+
+LOCAL_INCLUDES += $(LOCAL_PATH)
+
+ifneq ($(TARGET_SIMULATOR),true)
+  LOCAL_CFLAGS  += -DQEMU_HARDWARE
+  QEMU_HARDWARE := true
+endif
+
+ifneq ($(TARGET_SIMULATOR),true)
+LOCAL_SHARED_LIBRARIES += libdl
+endif
+
+include $(SAVE_MAKEFILES)
+
+LOCAL_SRC_FILES += hardware.c
+
+# need "-lrt" on Linux simulator to pick up clock_gettime
+ifeq ($(TARGET_SIMULATOR),true)
+	ifeq ($(HOST_OS),linux)
+		LOCAL_LDLIBS += -lrt -lpthread -ldl
+	endif
+endif
+
+LOCAL_MODULE:= libhardware
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..c5b1efa
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (c) 2005-2008, The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
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+      "Object" form shall mean any form resulting from mechanical
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+
+      "Work" shall mean the work of authorship, whether in Source or
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+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
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+          the Derivative Works; and
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+      (d) If the Work includes a "NOTICE" text file as part of its
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+          include a readable copy of the attribution notices contained
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+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
diff --git a/hardware.c b/hardware.c
new file mode 100644
index 0000000..86bce24
--- /dev/null
+++ b/hardware.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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 <hardware/hardware.h>
+
+#include <cutils/properties.h>
+
+#include <dlfcn.h>
+#include <string.h>
+#include <pthread.h>
+#include <errno.h>
+#include <limits.h>
+
+#define LOG_TAG "HAL"
+#include <utils/Log.h>
+
+/** Base path of the hal modules */
+#define HAL_LIBRARY_PATH "/system/lib/hw"
+
+/**
+ * There are a set of variant filename for modules. The form of the filename
+ * is "<MODULE_ID>.variant.so" so for the led module the Dream variants 
+ * of base "ro.product.board", "ro.board.platform" and "ro.arch" would be:
+ *
+ * led.trout.so
+ * led.msm7k.so
+ * led.ARMV6.so
+ * led.default.so
+ */
+
+#define HAL_DEFAULT_VARIANT     "default"
+#define HAL_VARIANT_KEYS_COUNT  4
+static const char *variant_keys[HAL_VARIANT_KEYS_COUNT] = {
+    "ro.product.board",
+    "ro.board.platform",
+    "ro.arch",
+    HAL_DEFAULT_VARIANT
+};
+
+/**
+ * Load the file defined by the path and if succesfull
+ * return the dlopen handle and the hmi.
+ * @return 0 = success, !0 = failure.
+ */
+static int load(const char *id,
+                const char *path,
+                void **pHandle,
+                const struct hw_module_t **pHmi)
+{
+    int status;
+    void *handle;
+    const struct hw_module_t *hmi;
+
+    LOGV("load: E id=%s path=%s", id, path);
+
+    /*
+     * load the symbols resolving undefined symbols before
+     * dlopen returns. Since RTLD_GLOBAL is not or'd in with
+     * RTLD_NOW the external symbols will not be global
+     */
+    handle = dlopen(path, RTLD_NOW);
+    if (handle == NULL) {
+        char const *err_str = dlerror();
+        LOGW("load: module=%s error=%s", path, err_str);
+        status = -EINVAL;
+        goto done;
+    }
+
+    /* Get the address of the struct hal_module_info. */
+    const char *sym = HAL_MODULE_INFO_SYM_AS_STR;
+    hmi = (const struct hw_module_t *)dlsym(handle, sym);
+    if (hmi == NULL) {
+        char const *err_str = dlerror();
+        LOGE("load: couldn't find symbol %s", sym);
+        status = -EINVAL;
+        goto done;
+    }
+
+    /* Check that the id matches */
+    if (strcmp(id, hmi->id) != 0) {
+        LOGE("load: id=%s != hmi->id=%s", id, hmi->id);
+        status = -EINVAL;
+        goto done;
+    }
+
+    /* success */
+    status = 0;
+
+done:
+    if (status != 0) {
+        hmi = NULL;
+        if (handle != NULL) {
+            dlclose(handle);
+            handle = NULL;
+        }
+    }
+
+    *pHmi = hmi;
+    *pHandle = handle;
+
+    LOGV("load: X id=%s path=%s hmi=%p pHandle=%p status=%d",
+         id, path, *pHmi, *pHandle, status);
+    return status;
+}
+
+int hw_get_module(const char *id, const struct hw_module_t **module) 
+{
+    int status;
+    const struct hw_module_t *hmi = NULL;
+    char path[PATH_MAX];
+    char variant[PATH_MAX];
+    void *handle = NULL;
+    int i;
+
+    /*
+     * Here we rely on the fact that calling dlopen multiple times on
+     * the same .so will simply increment a refcount (and not load
+     * a new copy of the library).
+     * We also assume that dlopen() is thread-safe.
+     */
+    
+    LOGV("hal_module_info_get: Load module id=%s", id);
+
+    /* Loop through the configuration variants looking for a module */
+    status = -EINVAL;
+    for (i = 0; (status != 0) && (i < HAL_VARIANT_KEYS_COUNT); i++) {
+
+        /* Get variant or default */
+        if (strcmp(variant_keys[i], HAL_DEFAULT_VARIANT) == 0) {
+            strncpy(variant, HAL_DEFAULT_VARIANT, sizeof(variant)-1);
+            variant[sizeof(variant)-1] = 0;
+        } else {
+            if (property_get(variant_keys[i], variant, NULL) == 0) {
+                continue;
+            }
+        }
+
+        /* Construct the path then try to load */
+        snprintf(path, sizeof(path), "%s/%s.%s.so",
+                HAL_LIBRARY_PATH, id, variant);
+        status = load(id, path, &handle, &hmi);
+    }
+    if (status != 0) {
+        hmi = NULL;
+        if (handle != NULL) {
+            dlclose(handle);
+        }
+    }
+    
+    *module = hmi;
+    LOGV("hal_module_info_get: X id=%s hmi=%p status=%d", id, hmi, status);
+
+    return status;
+}
diff --git a/include/hardware/copybit.h b/include/hardware/copybit.h
new file mode 100644
index 0000000..7774cd2
--- /dev/null
+++ b/include/hardware/copybit.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_COPYBIT_INTERFACE_H
+#define ANDROID_COPYBIT_INTERFACE_H
+
+#include <hardware/hardware.h>
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+/**
+ * The id of this module
+ */
+#define COPYBIT_HARDWARE_MODULE_ID "copybit"
+
+/**
+ * Name of the graphics device to open
+ */
+#define COPYBIT_HARDWARE_COPYBIT0 "copybit0"
+
+/* supported pixel-formats. these must be compatible with
+ * graphics/PixelFormat.java, ui/PixelFormat.h, pixelflinger/format.h
+ */
+enum {
+    COPYBIT_FORMAT_RGBA_8888    = HAL_PIXEL_FORMAT_RGBA_8888,
+    COPYBIT_FORMAT_RGB_565      = HAL_PIXEL_FORMAT_RGB_565,
+    COPYBIT_FORMAT_BGRA_8888    = HAL_PIXEL_FORMAT_BGRA_8888,
+    COPYBIT_FORMAT_RGBA_5551    = HAL_PIXEL_FORMAT_RGBA_5551,
+    COPYBIT_FORMAT_RGBA_4444    = HAL_PIXEL_FORMAT_RGBA_4444,
+    COPYBIT_FORMAT_YCbCr_422_SP = HAL_PIXEL_FORMAT_YCbCr_422_SP,
+    COPYBIT_FORMAT_YCbCr_420_SP = HAL_PIXEL_FORMAT_YCbCr_420_SP,
+};
+
+/* name for copybit_set_parameter */
+enum {
+    /* rotation of the source image in degrees (0 to 359) */
+    COPYBIT_ROTATION_DEG    = 1,
+    /* plane alpha value */
+    COPYBIT_PLANE_ALPHA     = 2,
+    /* enable or disable dithering */
+    COPYBIT_DITHER          = 3,
+    /* transformation applied (this is a superset of COPYBIT_ROTATION_DEG) */
+    COPYBIT_TRANSFORM       = 4,
+};
+
+/* values for copybit_set_parameter(COPYBIT_TRANSFORM) */
+enum {
+    /* flip source image horizontally */
+    COPYBIT_TRANSFORM_FLIP_H    = HAL_TRANSFORM_FLIP_H,
+    /* flip source image vertically */
+    COPYBIT_TRANSFORM_FLIP_V    = HAL_TRANSFORM_FLIP_V,
+    /* rotate source image 90 degres */
+    COPYBIT_TRANSFORM_ROT_90    = HAL_TRANSFORM_ROT_90,
+    /* rotate source image 180 degres */
+    COPYBIT_TRANSFORM_ROT_180   = HAL_TRANSFORM_ROT_180,
+    /* rotate source image 270 degres */
+    COPYBIT_TRANSFORM_ROT_270   = HAL_TRANSFORM_ROT_270,
+};
+
+/* enable/disable value copybit_set_parameter */
+enum {
+    COPYBIT_DISABLE = 0,
+    COPYBIT_ENABLE  = 1
+};
+
+/* use get_static_info() to query static informations about the hardware */
+enum {
+    /* Maximum amount of minification supported by the hardware*/
+    COPYBIT_MINIFICATION_LIMIT  = 1,
+    /* Maximum amount of magnification supported by the hardware */
+    COPYBIT_MAGNIFICATION_LIMIT = 2,
+    /* Number of fractional bits support by the scaling engine */
+    COPYBIT_SCALING_FRAC_BITS   = 3,
+    /* Supported rotation step in degres. */
+    COPYBIT_ROTATION_STEP_DEG   = 4,
+};
+
+/* Image structure */
+struct copybit_image_t {
+    /* width */
+    uint32_t    w;
+    /* height */
+    uint32_t    h;
+    /* format COPYBIT_FORMAT_xxx */
+    int32_t     format;
+    /* offset from base to first pixel */
+    uint32_t    offset;
+    /* base of buffer with image */
+    void       *base;
+    /* file descriptor for image */
+    int         fd;
+};
+
+/* Rectangle */
+struct copybit_rect_t {
+    /* left */
+    int l;
+    /* top */
+    int t;
+    /* right */
+    int r;
+    /* bottom */
+    int b;
+};
+
+/* Region */
+struct copybit_region_t {
+    int (*next)(struct copybit_region_t const *region, struct copybit_rect_t *rect);
+};
+
+/**
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+struct copybit_module_t {
+    struct hw_module_t common;
+};
+
+/**
+ * Every device data structure must begin with hw_device_t
+ * followed by module specific public methods and attributes.
+ */
+struct copybit_device_t {
+    struct hw_device_t common;
+
+    /**
+     * Set a copybit parameter.
+     *
+     * @param dev from open
+     * @param name one for the COPYBIT_NAME_xxx
+     * @param value one of the COPYBIT_VALUE_xxx
+     *
+     * @return 0 if successful
+     */
+    int (*set_parameter)(struct copybit_device_t *dev, int name, int value);
+
+    /**
+     * Get a static copybit information.
+     *
+     * @param dev from open
+     * @param name one of the COPYBIT_STATIC_xxx
+     *
+     * @return value or -EINVAL if error
+     */
+    int (*get)(struct copybit_device_t *dev, int name);
+
+    /**
+     * Execute the bit blit copy operation
+     *
+     * @param dev from open
+     * @param dst is the destination image
+     * @param src is the source image
+     * @param region the clip region
+     *
+     * @return 0 if successful
+     */
+    int (*blit)(struct copybit_device_t *dev,
+                struct copybit_image_t const *dst,
+                struct copybit_image_t const *src,
+                struct copybit_region_t const *region);
+
+    /**
+     * Execute the stretch bit blit copy operation
+     *
+     * @param dev from open
+     * @param dst is the destination image
+     * @param src is the source image
+     * @param dst_rect is the destination rectangle
+     * @param src_rect is the source rectangle
+     * @param region the clip region
+     *
+     * @return 0 if successful
+     */
+    int (*stretch)(struct copybit_device_t *dev,
+                   struct copybit_image_t const *dst,
+                   struct copybit_image_t const *src,
+                   struct copybit_rect_t const *dst_rect,
+                   struct copybit_rect_t const *src_rect,
+                   struct copybit_region_t const *region);
+};
+
+
+/** convenience API for opening and closing a device */
+
+static inline int copybit_open(const struct hw_module_t* module, 
+        struct copybit_device_t** device) {
+    return module->methods->open(module, 
+            COPYBIT_HARDWARE_COPYBIT0, (struct hw_device_t**)device);
+}
+
+static inline int copybit_close(struct copybit_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+
+__END_DECLS
+
+#endif  // ANDROID_COPYBIT_INTERFACE_H
diff --git a/include/hardware/hardware.h b/include/hardware/hardware.h
new file mode 100644
index 0000000..5325744
--- /dev/null
+++ b/include/hardware/hardware.h
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_INCLUDE_HARDWARE_HARDWARE_H
+#define ANDROID_INCLUDE_HARDWARE_HARDWARE_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/*
+ * Value for the hw_module_t.tag field
+ */
+#define HARDWARE_MODULE_TAG 'HWMT'
+#define HARDWARE_DEVICE_TAG 'HWDT'
+
+struct hw_module_t;
+struct hw_module_methods_t;
+struct hw_device_t;
+
+/**
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+struct hw_module_t {
+    /** tag must be initialized to HARDWARE_MODULE_TAG */
+    uint32_t tag;
+
+    /** major version number for the module */
+    uint16_t version_major;
+
+    /** minor version number of the module */
+    uint16_t version_minor;
+
+    /** Identifier of module */
+    const char *id;
+
+    /** Name of this module */
+    const char *name;
+
+    /** Author/owner/implementor of the module */
+    const char *author;
+
+    /** Modules methods */
+    struct hw_module_methods_t* methods;
+    
+    /** padding to 128 bytes, reserved for future use */
+    uint32_t reserved[32-6];
+};
+
+struct hw_module_methods_t {
+    /** Open a specific device */
+    int (*open)(const struct hw_module_t* module, const char* id,
+            struct hw_device_t** device);
+};
+
+/**
+ * Every device data structure must begin with hw_device_t
+ * followed by module specific public methods and attributes.
+ */
+struct hw_device_t {
+    /** tag must be initialized to HARDWARE_DEVICE_TAG */
+    uint32_t tag;
+
+    /** version number for hw_device_t */
+    uint32_t version;
+
+    /** reference to the module this device belongs to */
+    struct hw_module_t* module;
+
+    /** padding reserved for future use */
+    uint32_t reserved[12];
+
+    /** Close this device */
+    int (*close)(struct hw_device_t* device);
+};
+
+/**
+ * Name of the hal_module_info 
+ */
+#define HAL_MODULE_INFO_SYM         HMI
+
+/**
+ * Name of the hal_module_info as a string
+ */
+#define HAL_MODULE_INFO_SYM_AS_STR  "HMI"
+
+/**
+ * Get the module info associated with a module by id.
+ * @return: 0 == success, <0 == error and *pHmi == NULL
+ */
+int hw_get_module(const char *id, const struct hw_module_t **module);
+
+
+/**
+ * pixel format definitions
+ */
+
+enum {
+    HAL_PIXEL_FORMAT_RGBA_8888    = 1,
+    HAL_PIXEL_FORMAT_RGB_565      = 4,
+    HAL_PIXEL_FORMAT_BGRA_8888    = 5,
+    HAL_PIXEL_FORMAT_RGBA_5551    = 6,
+    HAL_PIXEL_FORMAT_RGBA_4444    = 7,
+    HAL_PIXEL_FORMAT_YCbCr_422_SP = 0x10,
+    HAL_PIXEL_FORMAT_YCbCr_420_SP = 0x11,
+    HAL_PIXEL_FORMAT_YCbCr_422_P  = 0x12,
+    HAL_PIXEL_FORMAT_YCbCr_420_P  = 0x13,
+    HAL_PIXEL_FORMAT_YCbCr_422_I  = 0x14,
+    HAL_PIXEL_FORMAT_YCbCr_420_I  = 0x15
+};
+
+
+/**
+ * Transformation definitions
+ */
+
+enum {
+    /* flip source image horizontally */
+    HAL_TRANSFORM_FLIP_H    = 0x01,
+    /* flip source image vertically */
+    HAL_TRANSFORM_FLIP_V    = 0x02,
+    /* rotate source image 90 degres */
+    HAL_TRANSFORM_ROT_90    = 0x04,
+    /* rotate source image 180 degres */
+    HAL_TRANSFORM_ROT_180   = 0x03,
+    /* rotate source image 270 degres */
+    HAL_TRANSFORM_ROT_270   = 0x07,
+};
+
+__END_DECLS
+
+#endif  /* ANDROID_INCLUDE_HARDWARE_HARDWARE_H */
diff --git a/include/hardware/overlay.h b/include/hardware/overlay.h
new file mode 100644
index 0000000..92992d1
--- /dev/null
+++ b/include/hardware/overlay.h
@@ -0,0 +1,225 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_OVERLAY_INTERFACE_H
+#define ANDROID_OVERLAY_INTERFACE_H
+
+#include <cutils/native_handle.h>
+
+#include <hardware/hardware.h>
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+/**
+ * The id of this module
+ */
+#define OVERLAY_HARDWARE_MODULE_ID "overlay"
+
+/**
+ * Name of the overlay device to open
+ */
+#define OVERLAY_HARDWARE_CONTROL    "control"
+#define OVERLAY_HARDWARE_DATA       "data"
+
+/*****************************************************************************/
+
+/* possible overlay formats */
+enum {
+    OVERLAY_FORMAT_RGBA_8888    = HAL_PIXEL_FORMAT_RGBA_8888,
+    OVERLAY_FORMAT_RGB_565      = HAL_PIXEL_FORMAT_RGB_565,
+    OVERLAY_FORMAT_BGRA_8888    = HAL_PIXEL_FORMAT_BGRA_8888,
+    OVERLAY_FORMAT_YCbCr_422_I  = HAL_PIXEL_FORMAT_YCbCr_422_I,
+    OVERLAY_FORMAT_YCbCr_420_I  = HAL_PIXEL_FORMAT_YCbCr_420_I
+};
+
+/* values for copybit_set_parameter(OVERLAY_TRANSFORM) */
+enum {
+    /* flip source image horizontally */
+    OVERLAY_TRANSFORM_FLIP_H    = HAL_TRANSFORM_FLIP_V,
+    /* flip source image vertically */
+    OVERLAY_TRANSFORM_FLIP_V    = HAL_TRANSFORM_FLIP_H,
+    /* rotate source image 90 degrees */
+    OVERLAY_TRANSFORM_ROT_90    = HAL_TRANSFORM_ROT_90,
+    /* rotate source image 180 degrees */
+    OVERLAY_TRANSFORM_ROT_180   = HAL_TRANSFORM_ROT_180,
+    /* rotate source image 270 degrees */
+    OVERLAY_TRANSFORM_ROT_270   = HAL_TRANSFORM_ROT_270
+};
+
+/* names for setParameter() */
+enum {
+    /* rotation of the source image in degrees (0 to 359) */
+    OVERLAY_ROTATION_DEG  = 1,
+    /* enable or disable dithering */
+    OVERLAY_DITHER        = 3,
+    /* transformation applied (this is a superset of COPYBIT_ROTATION_DEG) */
+    OVERLAY_TRANSFORM    = 4,
+};
+
+/* enable/disable value setParameter() */
+enum {
+    OVERLAY_DISABLE = 0,
+    OVERLAY_ENABLE  = 1
+};
+
+/* names for get() */
+enum {
+    /* Maximum amount of minification supported by the hardware*/
+    OVERLAY_MINIFICATION_LIMIT      = 1,
+    /* Maximum amount of magnification supported by the hardware */
+    OVERLAY_MAGNIFICATION_LIMIT     = 2,
+    /* Number of fractional bits support by the overlay scaling engine */
+    OVERLAY_SCALING_FRAC_BITS       = 3,
+    /* Supported rotation step in degrees. */
+    OVERLAY_ROTATION_STEP_DEG       = 4,
+    /* horizontal alignment in pixels */
+    OVERLAY_HORIZONTAL_ALIGNMENT    = 5,
+    /* vertical alignment in pixels */
+    OVERLAY_VERTICAL_ALIGNMENT      = 6,
+    /* width alignment restrictions. negative number for max. power-of-two */
+    OVERLAY_WIDTH_ALIGNMENT         = 7,
+    /* height alignment restrictions. negative number for max. power-of-two */
+    OVERLAY_HEIGHT_ALIGNMENT        = 8,
+};
+
+/*****************************************************************************/
+
+/* opaque reference to an Overlay kernel object */
+typedef const native_handle* overlay_handle_t;
+
+typedef struct overlay_t {
+    uint32_t            w;
+    uint32_t            h;
+    int32_t             format;
+    uint32_t            w_stride;
+    uint32_t            h_stride;
+    uint32_t            reserved[3];
+    /* returns a reference to this overlay's handle (the caller doesn't
+     * take ownership) */
+    overlay_handle_t    (*getHandleRef)(struct overlay_t* overlay);
+    uint32_t            reserved_procs[7];
+} overlay_t;
+
+typedef void* overlay_buffer_t;
+
+/*****************************************************************************/
+
+/**
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+struct overlay_module_t {
+    struct hw_module_t common;
+};
+
+/*****************************************************************************/
+
+/**
+ * Every device data structure must begin with hw_device_t
+ * followed by module specific public methods and attributes.
+ */
+
+struct overlay_control_device_t {
+    struct hw_device_t common;
+    
+    /* get static informations about the capabilities of the overlay engine */
+    int (*get)(struct overlay_control_device_t *dev, int name);
+
+    /* creates an overlay matching the given parameters as closely as possible.
+     * returns an error if no more overlays are available. The actual
+     * size and format is returned in overlay_t. */
+    overlay_t* (*createOverlay)(struct overlay_control_device_t *dev,
+            uint32_t w, uint32_t h, int32_t format);
+    
+    /* destroys an overlay. This call releases all
+     * resources associated with overlay_t and make it invalid */
+    void (*destroyOverlay)(struct overlay_control_device_t *dev,
+            overlay_t* overlay);
+
+    /* set position and scaling of the given overlay as closely as possible.
+     * if scaling cannot be performed, overlay must be centered. */
+    int (*setPosition)(struct overlay_control_device_t *dev,
+            overlay_t* overlay, 
+            int x, int y, uint32_t w, uint32_t h);
+
+    /* returns the actual position and size of the overlay */
+    int (*getPosition)(struct overlay_control_device_t *dev,
+            overlay_t* overlay, 
+            int* x, int* y, uint32_t* w, uint32_t* h);
+
+    /* sets configurable parameters for this overlay. returns an error if not
+     * supported. */
+    int (*setParameter)(struct overlay_control_device_t *dev,
+            overlay_t* overlay, int param, int value);
+};
+
+
+struct overlay_data_device_t {
+    struct hw_device_t common;
+
+    /* initialize the overlay from the given handle. this associates this
+     * overlay data module to its control module */
+    int (*initialize)(struct overlay_data_device_t *dev,
+            overlay_handle_t handle);
+    
+    /* blocks until an overlay buffer is available and return that buffer. */
+    int (*dequeueBuffer)(struct overlay_data_device_t *dev,
+		         overlay_buffer_t *buf);
+
+    /* release the overlay buffer and post it */
+    int (*queueBuffer)(struct overlay_data_device_t *dev,
+            overlay_buffer_t buffer);
+
+    /* returns the address of a given buffer if supported, NULL otherwise. */
+    void* (*getBufferAddress)(struct overlay_data_device_t *dev,
+            overlay_buffer_t buffer);
+
+    int (*getBufferCount)(struct overlay_data_device_t *dev);
+};
+
+
+/*****************************************************************************/
+
+/** convenience API for opening and closing a device */
+
+static inline int overlay_control_open(const struct hw_module_t* module, 
+        struct overlay_control_device_t** device) {
+    return module->methods->open(module, 
+            OVERLAY_HARDWARE_CONTROL, (struct hw_device_t**)device);
+}
+
+static inline int overlay_control_close(struct overlay_control_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+static inline int overlay_data_open(const struct hw_module_t* module, 
+        struct overlay_data_device_t** device) {
+    return module->methods->open(module, 
+            OVERLAY_HARDWARE_DATA, (struct hw_device_t**)device);
+}
+
+static inline int overlay_data_close(struct overlay_data_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+__END_DECLS
+
+#endif  // ANDROID_OVERLAY_INTERFACE_H
diff --git a/include/hardware/sensors.h b/include/hardware/sensors.h
new file mode 100644
index 0000000..094b3ee
--- /dev/null
+++ b/include/hardware/sensors.h
@@ -0,0 +1,375 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_SENSORS_INTERFACE_H
+#define ANDROID_SENSORS_INTERFACE_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <hardware/hardware.h>
+
+__BEGIN_DECLS
+
+/**
+ * The id of this module
+ */
+#define SENSORS_HARDWARE_MODULE_ID "sensors"
+
+/**
+ * Name of the sensors device to open
+ */
+#define SENSORS_HARDWARE_CONTROL    "control"
+#define SENSORS_HARDWARE_DATA       "data"
+
+/**
+ * Handles must be higher than SENSORS_HANDLE_BASE and must be unique.
+ * A Handle identifies a given sensors. The handle is used to activate
+ * and/or deactivate sensors.
+ * In this version of the API there can only be 256 handles.
+ */
+#define SENSORS_HANDLE_BASE             0
+#define SENSORS_HANDLE_BITS             8
+#define SENSORS_HANDLE_COUNT            (1<<SENSORS_HANDLE_BITS)
+
+
+/**
+ * Sensor types
+ */
+#define SENSOR_TYPE_ACCELEROMETER       1
+#define SENSOR_TYPE_MAGNETIC_FIELD      2
+#define SENSOR_TYPE_ORIENTATION         3
+#define SENSOR_TYPE_GYROSCOPE           4
+#define SENSOR_TYPE_LIGHT               5
+#define SENSOR_TYPE_PRESSURE            6
+#define SENSOR_TYPE_TEMPERATURE         7
+#define SENSOR_TYPE_PROXIMITY           8
+
+/**
+ * Values returned by the accelerometer in various locations in the universe.
+ * all values are in SI units (m/s^2)
+ */
+
+#define GRAVITY_SUN             (275.0f)
+#define GRAVITY_MERCURY         (3.70f)
+#define GRAVITY_VENUS           (8.87f)
+#define GRAVITY_EARTH           (9.80665f)
+#define GRAVITY_MOON            (1.6f)
+#define GRAVITY_MARS            (3.71f)
+#define GRAVITY_JUPITER         (23.12f)
+#define GRAVITY_SATURN          (8.96f)
+#define GRAVITY_URANUS          (8.69f)
+#define GRAVITY_NEPTUNE         (11.0f)
+#define GRAVITY_PLUTO           (0.6f)
+#define GRAVITY_DEATH_STAR_I    (0.000000353036145f)
+#define GRAVITY_THE_ISLAND      (4.815162342f)
+
+/** Maximum magnetic field on Earth's surface */
+#define MAGNETIC_FIELD_EARTH_MAX    (60.0f)
+
+/** Minimum magnetic field on Earth's surface */
+#define MAGNETIC_FIELD_EARTH_MIN    (30.0f)
+
+
+/**
+ * status of each sensor
+ */
+
+#define SENSOR_STATUS_UNRELIABLE        0
+#define SENSOR_STATUS_ACCURACY_LOW      1
+#define SENSOR_STATUS_ACCURACY_MEDIUM   2
+#define SENSOR_STATUS_ACCURACY_HIGH     3
+
+/**
+ * Definition of the axis
+ * ----------------------
+ *
+ * This API is relative to the screen of the device in its default orientation,
+ * that is, if the device can be used in portrait or landscape, this API
+ * is only relative to the NATURAL orientation of the screen. In other words,
+ * the axis are not swapped when the device's screen orientation changes.
+ * Higher level services /may/ perform this transformation.
+ *
+ *   x<0         x>0
+ *                ^
+ *                |
+ *    +-----------+-->  y>0
+ *    |           |
+ *    |           |
+ *    |           |
+ *    |           |   / z<0
+ *    |           |  /
+ *    |           | /
+ *    O-----------+/
+ *    |[]  [ ]  []/
+ *    +----------/+     y<0
+ *              /
+ *             /
+ *           |/ z>0 (toward the sky)
+ *
+ *    O: Origin (x=0,y=0,z=0)
+ *
+ *
+ * Orientation
+ * ----------- 
+ * 
+ * All values are angles in degrees.
+ * 
+ * azimuth: angle between the magnetic north direction and the Y axis, around 
+ *  the Z axis (0<=azimuth<360).
+ *      0=North, 90=East, 180=South, 270=West
+ * 
+ * pitch: Rotation around X axis (-180<=pitch<=180), with positive values when
+ *  the z-axis moves toward the y-axis.
+ *
+ * roll: Rotation around Y axis (-90<=roll<=90), with positive values when
+ *  the z-axis moves AWAY from the x-axis.
+ * 
+ * Note: This definition is different from yaw, pitch and roll used in aviation
+ *  where the X axis is along the long side of the plane (tail to nose).
+ *  
+ *  
+ * Acceleration
+ * ------------
+ *
+ *  All values are in SI units (m/s^2) and measure the acceleration of the
+ *  device minus the force of gravity.
+ *  
+ *  x: Acceleration minus Gx on the x-axis 
+ *  y: Acceleration minus Gy on the y-axis 
+ *  z: Acceleration minus Gz on the z-axis
+ *  
+ *  Examples:
+ *    When the device lies flat on a table and is pushed on its left side
+ *    toward the right, the x acceleration value is positive.
+ *    
+ *    When the device lies flat on a table, the acceleration value is +9.81,
+ *    which correspond to the acceleration of the device (0 m/s^2) minus the
+ *    force of gravity (-9.81 m/s^2).
+ *    
+ *    When the device lies flat on a table and is pushed toward the sky, the
+ *    acceleration value is greater than +9.81, which correspond to the
+ *    acceleration of the device (+A m/s^2) minus the force of 
+ *    gravity (-9.81 m/s^2).
+ *    
+ *    
+ * Magnetic Field
+ * --------------
+ * 
+ *  All values are in micro-Tesla (uT) and measure the ambient magnetic
+ *  field in the X, Y and Z axis.
+ *    
+ */
+typedef struct {
+    union {
+        float v[3];
+        struct {
+            float x;
+            float y;
+            float z;
+        };
+        struct {
+            float azimuth;
+            float pitch;
+            float roll;
+        };
+    };
+    int8_t status;
+    uint8_t reserved[3];
+} sensors_vec_t;
+
+/**
+ * Union of the various types of sensor data
+ * that can be returned.
+ */
+typedef struct {
+    /* sensor identifier */
+    int             sensor;
+
+    union {
+        /* x,y,z values of the given sensor */
+        sensors_vec_t   vector;
+
+        /* orientation values are in degrees */
+        sensors_vec_t   orientation;
+
+        /* acceleration values are in meter per second per second (m/s^2) */
+        sensors_vec_t   acceleration;
+
+        /* magnetic vector values are in micro-Tesla (uT) */
+        sensors_vec_t   magnetic;
+
+        /* temperature is in degrees centigrade (Celsius) */
+        float           temperature;
+    };
+
+    /* time is in nanosecond */
+    int64_t         time;
+
+    uint32_t        reserved;
+} sensors_data_t;
+
+
+struct sensor_t;
+
+/**
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+struct sensors_module_t {
+    struct hw_module_t common;
+
+    /**
+     * Enumerate all available sensors. The list is returned in "list".
+     * @return number of sensors in the list
+     */
+    int (*get_sensors_list)(struct sensors_module_t* module,
+            struct sensor_t const** list);
+};
+
+struct sensor_t {
+    /* name of this sensors */
+    const char*     name;
+    /* vendor of the hardware part */
+    const char*     vendor;
+    /* version of the hardware part + driver. The value of this field is
+     * left to the implementation and doesn't have to be monotonicaly
+     * increasing.
+     */    
+    int             version;
+    /* handle that identifies this sensors. This handle is used to activate
+     * and deactivate this sensor. The value of the handle must be 8 bits
+     * in this version of the API. 
+     */
+    int             handle;
+    /* this sensor's type. */
+    int             type;
+    /* maximaum range of this sensor's value in SI units */
+    float           maxRange;
+    /* smallest difference between two values reported by this sensor */
+    float           resolution;
+    /* rough estimate of this sensor's power consumption in mA */
+    float           power;
+    /* reserved fields, must be zero */
+    void*           reserved[9];
+};
+
+
+/**
+ * Every device data structure must begin with hw_device_t
+ * followed by module specific public methods and attributes.
+ */
+struct sensors_control_device_t {
+    struct hw_device_t common;
+    
+    /**
+     * Returns the fd which will be the parameter to
+     * sensors_data_device_t::open_data(). 
+     * The caller takes ownership of this fd. This is intended to be
+     * passed cross processes.
+     *
+     * @return a fd if successful, < 0 on error
+     */
+    int (*open_data_source)(struct sensors_control_device_t *dev);
+    
+    /** Activate/deactivate one sensor.
+     *
+     * @param handle is the handle of the sensor to change.
+     * @param enabled set to 1 to enable, or 0 to disable the sensor.
+     *
+     * @return 0 on success, negative errno code otherwise
+     */
+    int (*activate)(struct sensors_control_device_t *dev, 
+            int handle, int enabled);
+    
+    /**
+     * Set the delay between sensor events in ms
+     *
+     * @return 0 if successful, < 0 on error
+     */
+    int (*set_delay)(struct sensors_control_device_t *dev, int32_t ms);
+
+    /**
+     * Causes sensors_data_device_t.poll() to return -EWOULDBLOCK immediately.
+     */
+    int (*wake)(struct sensors_control_device_t *dev);
+};
+
+struct sensors_data_device_t {
+    struct hw_device_t common;
+
+    /**
+     * Prepare to read sensor data.
+     *
+     * This routine does NOT take ownership of the fd
+     * and must not close it. Typically this routine would
+     * use a duplicate of the fd parameter.
+     *
+     * @param fd from sensors_control_open.
+     *
+     * @return 0 if successful, < 0 on error
+     */
+    int (*data_open)(struct sensors_data_device_t *dev, int fd);
+    
+    /**
+     * Caller has completed using the sensor data.
+     * The caller will not be blocked in sensors_data_poll
+     * when this routine is called.
+     *
+     * @return 0 if successful, < 0 on error
+     */
+    int (*data_close)(struct sensors_data_device_t *dev);
+    
+    /**
+     * Return sensor data for one of the enabled sensors.
+     *
+     * @return sensor handle for the returned data, 0x7FFFFFFF when 
+     * sensors_control_device_t.wake() is called and -errno on error
+     *  
+     */
+    int (*poll)(struct sensors_data_device_t *dev, 
+            sensors_data_t* data);
+};
+
+
+/** convenience API for opening and closing a device */
+
+static inline int sensors_control_open(const struct hw_module_t* module, 
+        struct sensors_control_device_t** device) {
+    return module->methods->open(module, 
+            SENSORS_HARDWARE_CONTROL, (struct hw_device_t**)device);
+}
+
+static inline int sensors_control_close(struct sensors_control_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+static inline int sensors_data_open(const struct hw_module_t* module, 
+        struct sensors_data_device_t** device) {
+    return module->methods->open(module, 
+            SENSORS_HARDWARE_DATA, (struct hw_device_t**)device);
+}
+
+static inline int sensors_data_close(struct sensors_data_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+
+__END_DECLS
+
+#endif  // ANDROID_SENSORS_INTERFACE_H
diff --git a/modules/README.android b/modules/README.android
new file mode 100644
index 0000000..57abb72
--- /dev/null
+++ b/modules/README.android
@@ -0,0 +1,23 @@
+Default (and possibly architecture dependents) HAL modules go here. 
+
+
+libhardware.so eventually should contain *just* the HAL hub
+(hardware.c), everything in it should be rewritten as modules.
+
+Modules are .so in /system/libs/hw/ and have a well defined naming
+convention:
+
+    /system/libs/hw/<*_HARDWARE_MODULE_ID>.<ro.product.board>.so
+    /system/libs/hw/<*_HARDWARE_MODULE_ID>.<ro.board.platform>.so
+    /system/libs/hw/<*_HARDWARE_MODULE_ID>.<ro.arch>.so
+    /system/libs/hw/<*_HARDWARE_MODULE_ID>.default.so
+
+They also have a well defined interface which lives in include/hardware/.
+
+A module can have several variants: "default", "arch" and "board", and they're
+loaded in the "board", "arch" and "default" order.
+The source code for the "board" variant, usually lives under partners/...
+
+The source code for "default" and "arch" would usually
+live under hardware/modules/.
+
diff --git a/modules/overlay/Android.mk b/modules/overlay/Android.mk
new file mode 100644
index 0000000..44b55af
--- /dev/null
+++ b/modules/overlay/Android.mk
@@ -0,0 +1,26 @@
+# Copyright (C) 2008 The Android Open Source Project
+#
+# 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.
+
+
+LOCAL_PATH := $(call my-dir)
+
+# HAL module implemenation, not prelinked and stored in
+# hw/<OVERLAY_HARDWARE_MODULE_ID>.<ro.product.board>.so
+include $(CLEAR_VARS)
+LOCAL_PRELINK_MODULE := false
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_SRC_FILES := overlay.cpp
+LOCAL_MODULE := overlay.trout
+include $(BUILD_SHARED_LIBRARY)
diff --git a/modules/overlay/README.android b/modules/overlay/README.android
new file mode 100644
index 0000000..971d619
--- /dev/null
+++ b/modules/overlay/README.android
@@ -0,0 +1,3 @@
+
+Skeleton for the "overlay" HAL module.
+
diff --git a/modules/overlay/overlay.cpp b/modules/overlay/overlay.cpp
new file mode 100644
index 0000000..0246b5b
--- /dev/null
+++ b/modules/overlay/overlay.cpp
@@ -0,0 +1,321 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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 LOG_TAG "Overlay"
+
+#include <hardware/hardware.h>
+#include <hardware/overlay.h>
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include <cutils/log.h>
+#include <cutils/atomic.h>
+
+/*****************************************************************************/
+
+struct overlay_control_context_t {
+    struct overlay_control_device_t device;
+    /* our private state goes below here */
+};
+
+struct overlay_data_context_t {
+    struct overlay_data_device_t device;
+    /* our private state goes below here */
+};
+
+static int overlay_device_open(const struct hw_module_t* module, const char* name,
+        struct hw_device_t** device);
+
+static struct hw_module_methods_t overlay_module_methods = {
+    open: overlay_device_open
+};
+
+const struct overlay_module_t HAL_MODULE_INFO_SYM = {
+    common: {
+        tag: HARDWARE_MODULE_TAG,
+        version_major: 1,
+        version_minor: 0,
+        id: OVERLAY_HARDWARE_MODULE_ID,
+        name: "Sample Overlay module",
+        author: "The Android Open Source Project",
+        methods: &overlay_module_methods,
+    }
+};
+
+/*****************************************************************************/
+
+/*
+ * This is the overlay_t object, it is returned to the user and represents
+ * an overlay.
+ * This handles will be passed across processes and possibly given to other
+ * HAL modules (for instance video decode modules).
+ */
+
+class overlay_object : public overlay_t {
+    
+    struct handle_t : public native_handle {
+        /* add the data fields we need here, for instance: */
+        int width;
+        int height;
+    };
+    
+    handle_t mHandle;
+    
+    static overlay_handle_t getHandleRef(struct overlay_t* overlay) {
+        /* returns a reference to the handle, caller doesn't take ownership */
+        return &(static_cast<overlay_object *>(overlay)->mHandle);
+    }
+    
+public:
+    overlay_object() {
+        this->overlay_t::getHandleRef = getHandleRef;
+        mHandle.version = sizeof(native_handle);
+        mHandle.numFds = 0;
+        mHandle.numInts = 2; // extra ints we have in  our handle
+    }
+};
+
+// ****************************************************************************
+// Control module
+// ****************************************************************************
+
+static int overlay_get(struct overlay_control_device_t *dev, int name) {
+    int result = -1;
+    switch (name) {
+        case OVERLAY_MINIFICATION_LIMIT:
+            result = 0; // 0 = no limit
+            break;
+        case OVERLAY_MAGNIFICATION_LIMIT:
+            result = 0; // 0 = no limit
+            break;
+        case OVERLAY_SCALING_FRAC_BITS:
+            result = 0; // 0 = infinite
+            break;
+        case OVERLAY_ROTATION_STEP_DEG:
+            result = 90; // 90 rotation steps (for instance)
+            break;
+        case OVERLAY_HORIZONTAL_ALIGNMENT:
+            result = 1; // 1-pixel alignment
+            break;
+        case OVERLAY_VERTICAL_ALIGNMENT:
+            result = 1; // 1-pixel alignment
+            break;
+        case OVERLAY_WIDTH_ALIGNMENT:
+            result = 1; // 1-pixel alignment
+            break;
+        case OVERLAY_HEIGHT_ALIGNMENT:
+            result = 1; // 1-pixel alignment
+            break;
+    }
+    return result;
+}
+
+static overlay_t* overlay_createOverlay(struct overlay_control_device_t *dev,
+         uint32_t w, uint32_t h, int32_t format) 
+{
+    /* check the input params, reject if not supported or invalid */
+    switch (format) {
+        case OVERLAY_FORMAT_RGBA_8888:
+        case OVERLAY_FORMAT_RGB_565:
+        case OVERLAY_FORMAT_BGRA_8888:
+        case OVERLAY_FORMAT_YCbCr_422_SP:
+        case OVERLAY_FORMAT_YCbCr_420_SP:
+        case OVERLAY_FORMAT_YCbCr_422_I:
+        case OVERLAY_FORMAT_YCbCr_420_I:
+            break;
+        default:
+            return NULL;
+    }
+    
+    /* Create overlay object. Talk to the h/w here and adjust to what it can
+     * do. the overlay_t returned can  be a C++ object, subclassing overlay_t
+     * if needed.
+     * 
+     * we probably want to keep a list of the overlay_t created so they can
+     * all be cleaned up in overlay_close(). 
+     */
+    return new overlay_object( /* pass needed params here*/ );
+}
+
+static void overlay_destroyOverlay(struct overlay_control_device_t *dev,
+         overlay_t* overlay) 
+{
+    /* free resources associated with this overlay_t */
+    delete overlay;
+}
+
+static int overlay_setPosition(struct overlay_control_device_t *dev,
+         overlay_t* overlay, 
+         int x, int y, uint32_t w, uint32_t h) {
+    /* set this overlay's position (talk to the h/w) */
+    return -EINVAL;
+}
+
+static int overlay_getPosition(struct overlay_control_device_t *dev,
+         overlay_t* overlay, 
+         int* x, int* y, uint32_t* w, uint32_t* h) {
+    /* get this overlay's position */
+    return -EINVAL;
+}
+
+static int overlay_setParameter(struct overlay_control_device_t *dev,
+         overlay_t* overlay, int param, int value) {
+    
+    int result = 0;
+    /* set this overlay's parameter (talk to the h/w) */
+    switch (param) {
+        case OVERLAY_ROTATION_DEG:
+            /* if only 90 rotations are supported, the call fails
+             * for other values */
+            break;
+        case OVERLAY_DITHER: 
+            break;
+        case OVERLAY_TRANSFORM: 
+            // see OVERLAY_TRANSFORM_*
+            break;
+        default:
+            result = -EINVAL;
+            break;
+    }
+    return result;
+}
+
+static int overlay_control_close(struct hw_device_t *dev) 
+{
+    struct overlay_control_context_t* ctx = (struct overlay_control_context_t*)dev;
+    if (ctx) {
+        /* free all resources associated with this device here
+         * in particular the overlay_handle_t, outstanding overlay_t, etc...
+         */
+        free(ctx);
+    }
+    return 0;
+}
+ 
+// ****************************************************************************
+// Data module
+// ****************************************************************************
+
+int overlay_initialize(struct overlay_data_device_t *dev,
+        overlay_handle_t handle)
+{
+    /* 
+     * overlay_handle_t should contain all the information to "inflate" this
+     * overlay. Typically it'll have a file descriptor, informations about
+     * how many buffers are there, etc...
+     * It is also the place to mmap all buffers associated with this overlay
+     * (see getBufferAddress).
+     * 
+     * NOTE: this function doesn't take ownership of overlay_handle_t
+     * 
+     */
+    
+    return -EINVAL;
+}
+
+int overlay_dequeueBuffer(struct overlay_data_device_t *dev,
+			  overlay_buffer_t* buf) 
+{
+    /* blocks until a buffer is available and return an opaque structure
+     * representing this buffer.
+     */
+    return -EINVAL;
+}
+
+int overlay_queueBuffer(struct overlay_data_device_t *dev,
+        overlay_buffer_t buffer)
+{
+    /* Mark this buffer for posting and recycle or free overlay_buffer_t. */
+    return -EINVAL;
+}
+
+void *overlay_getBufferAddress(struct overlay_data_device_t *dev,
+        overlay_buffer_t buffer)
+{
+    /* this may fail (NULL) if this feature is not supported. In that case,
+     * presumably, there is some other HAL module that can fill the buffer,
+     * using a DSP for instance */
+    return NULL;
+}
+
+static int overlay_data_close(struct hw_device_t *dev) 
+{
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+    if (ctx) {
+        /* free all resources associated with this device here
+         * in particular all pending overlay_buffer_t if needed.
+         * 
+         * NOTE: overlay_handle_t passed in initialize() is NOT freed and
+         * its file descriptors are not closed (this is the responsibility
+         * of the caller).
+         */
+        free(ctx);
+    }
+    return 0;
+}
+
+/*****************************************************************************/
+
+static int overlay_device_open(const struct hw_module_t* module, const char* name,
+        struct hw_device_t** device)
+{
+    int status = -EINVAL;
+    if (!strcmp(name, OVERLAY_HARDWARE_CONTROL)) {
+        struct overlay_control_context_t *dev;
+        dev = (overlay_control_context_t*)malloc(sizeof(*dev));
+
+        /* initialize our state here */
+        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 = overlay_control_close;
+        
+        dev->device.get = overlay_get;
+        dev->device.createOverlay = overlay_createOverlay;
+        dev->device.destroyOverlay = overlay_destroyOverlay;
+        dev->device.setPosition = overlay_setPosition;
+        dev->device.getPosition = overlay_getPosition;
+        dev->device.setParameter = overlay_setParameter;
+
+        *device = &dev->device.common;
+        status = 0;
+    } else if (!strcmp(name, OVERLAY_HARDWARE_DATA)) {
+        struct overlay_data_context_t *dev;
+        dev = (overlay_data_context_t*)malloc(sizeof(*dev));
+
+        /* initialize our state here */
+        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 = overlay_data_close;
+        
+        dev->device.initialize = overlay_initialize;
+        dev->device.dequeueBuffer = overlay_dequeueBuffer;
+        dev->device.queueBuffer = overlay_queueBuffer;
+        dev->device.getBufferAddress = overlay_getBufferAddress;
+        
+        *device = &dev->device.common;
+        status = 0;
+    }
+    return status;
+}