libdvrcommon: Remove revision code.

sourceFiles = [

    "frame_time_history.cpp",

    "revision.cpp",

    "revision_path.cpp",

    "sync_util.cpp",

]

#ifndef LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_REVISION_H_

#define LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_REVISION_H_

#ifdef __cplusplus

extern "C" {

#endif

// List of DreamOS products

typedef enum DvrProduct {

  DVR_PRODUCT_UNKNOWN,

  DVR_PRODUCT_A00,

  DVR_PRODUCT_A65R,

  DVR_PRODUCT_TWILIGHT = DVR_PRODUCT_A65R

} DvrProduct;

// List of possible revisions.

typedef enum DvrRevision {

  DVR_REVISION_UNKNOWN,

  DVR_REVISION_P1,

  DVR_REVISION_P2,

  DVR_REVISION_P3,

} DvrRevision;

// Query the device's product.

//

// @return DvrProduct value, or DvrProductUnknown on error.

DvrProduct dvr_get_product();

// Query the device's revision.

//

// @return DvrRevision value, or DvrRevisionUnknown on error.

DvrRevision dvr_get_revision();

// Returns the device's board revision string.

//

// @return NULL-terminated string such as 'a00-p1'.

const char* dvr_get_product_revision_str();

// Returns the device's serial number.

//

// @return Returns NULL on error, or a NULL-terminated string.

const char* dvr_get_serial_number();

#ifdef __cplusplus

}

#endif  // extern "C"

#endif  // LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_REVISION_H_

#include "private/dvr/revision.h"

#include <errno.h>

#include <fcntl.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

#include <log/log.h>

#include "revision_path.h"

namespace {

// Allows quicker access to the product revision. If non-zero, then

// the product revision file has already been processed.

static bool global_product_revision_processed = false;

static bool global_serial_number_processed = false;

// The product.

static DvrProduct global_product = DVR_PRODUCT_UNKNOWN;

// The revision.

static DvrRevision global_revision = DVR_REVISION_UNKNOWN;

// Maximum size of the product revision string.

constexpr int kProductRevisionStringSize = 32;

// Maximum size of the serial number.

constexpr int kSerialNumberStringSize = 32;

// The product revision string.

static char global_product_revision_str[kProductRevisionStringSize + 1] = "";

// The serial number string

static char global_serial_number[kSerialNumberStringSize + 1] = "";

// Product and revision combinations.

struct DvrProductRevision {

  const char* str;

  DvrProduct product;

  DvrRevision revision;

};

// Null-terminated list of all product and revision combinations.

static constexpr DvrProductRevision kProductRevisions[] = {

    {"a00-p1", DVR_PRODUCT_A00, DVR_REVISION_P1},

    {"a00-p2", DVR_PRODUCT_A00, DVR_REVISION_P2},

    {"a00-p3", DVR_PRODUCT_A00, DVR_REVISION_P3},

    {"twilight-p1", DVR_PRODUCT_A65R, DVR_REVISION_P1},

    {"twilight-p2", DVR_PRODUCT_A65R, DVR_REVISION_P2},

    {NULL, DVR_PRODUCT_UNKNOWN, DVR_REVISION_UNKNOWN}};

// Read the product revision string, and store the global data.

static void process_product_revision() {

  int fd;

  ssize_t read_rc;

  const DvrProductRevision* product_revision = kProductRevisions;

  // Of course in a multi-threaded environment, for a few microseconds

  // during process startup, it is possible that this function will be

  // called and execute fully multiple times. That is why the product

  // revision string is statically allocated.

  if (global_product_revision_processed)

    return;

  // Whether there was a failure or not, we don't want to do this again.

  // Upon failure it's most likely to fail again anyway.

  fd = open(dvr_product_revision_file_path(), O_RDONLY);

  if (fd < 0) {

    ALOGE("Could not open '%s' to get product revision: %s",

          dvr_product_revision_file_path(), strerror(errno));

    global_product_revision_processed = true;

    return;

  }

  read_rc = read(fd, global_product_revision_str, kProductRevisionStringSize);

  if (read_rc <= 0) {

    ALOGE("Could not read from '%s': %s", dvr_product_revision_file_path(),

          strerror(errno));

    global_product_revision_processed = true;

    return;

  }

  close(fd);

  global_product_revision_str[read_rc] = '\0';

  while (product_revision->str) {

    if (!strcmp(product_revision->str, global_product_revision_str))

      break;

    product_revision++;

  }

  if (product_revision->str) {

    global_product = product_revision->product;

    global_revision = product_revision->revision;

  } else {

    ALOGE("Unable to match '%s' to a product/revision.",

          global_product_revision_str);

  }

  global_product_revision_processed = true;

}

}  // anonymous namespace

extern "C" DvrProduct dvr_get_product() {

  process_product_revision();

  return global_product;

}

extern "C" DvrRevision dvr_get_revision() {

  process_product_revision();

  return global_revision;

}

extern "C" const char* dvr_get_product_revision_str() {

  process_product_revision();

  return global_product_revision_str;

}

extern "C" const char* dvr_get_serial_number() {

  process_product_revision();

  if (global_product == DVR_PRODUCT_A00) {

    if (!global_serial_number_processed) {

#ifdef DVR_HOST

      global_serial_number_processed = true;

#else

      int width = 4;

      uintptr_t addr = 0x00074138;

      uintptr_t endaddr = addr + width - 1;

      int fd = open("/dev/mem", O_RDWR | O_SYNC);

      if (fd < 0) {

        if (errno == EPERM)

          global_serial_number_processed = true;

        fprintf(stderr, "cannot open /dev/mem\n");

        return global_serial_number;

      }

      off64_t mmap_start = addr & ~(PAGE_SIZE - 1);

      size_t mmap_size = endaddr - mmap_start + 1;

      mmap_size = (mmap_size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);

      void* page = mmap64(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,

                          mmap_start);

      if (page == MAP_FAILED) {

        global_serial_number_processed = true;

        fprintf(stderr, "cannot mmap region\n");

        close(fd);

        return global_serial_number;

      }

      uint32_t* x =

          reinterpret_cast<uint32_t*>((((uintptr_t)page) + (addr & 4095)));

      snprintf(global_serial_number, kSerialNumberStringSize, "%08x", *x);

      global_serial_number_processed = true;

      munmap(page, mmap_size);

      close(fd);

#endif

    }

    return global_serial_number;

  } else {

    return nullptr;

  }

}

#include "revision_path.h"

namespace {

// The path to the product revision file.

static const char* kProductRevisionFilePath =

    "/sys/firmware/devicetree/base/goog,board-revision";

}  // anonymous namespace

// This exists in a separate file so that it can be replaced for

// testing.

const char* dvr_product_revision_file_path() {

  return kProductRevisionFilePath;

}

#ifndef ANDROID_DVR_LIBDVRCOMMON_REVISION_PATH_H_

#define ANDROID_DVR_LIBDVRCOMMON_REVISION_PATH_H_

// Returns the revision file path.

// This exists in a separate file so that it can be replaced for

// testing.

const char* dvr_product_revision_file_path();

#endif  // ANDROID_DVR_LIBDVRCOMMON_REVISION_PATH_H_