drm_hwcomposer: use CamelCase in source/header files related to class

Main goal is to increase readability of file names.
AOSP uses camelcase for files in many projects.
Lets do the same for drm_hwcomposer.

Keep platform/ directory as is, since class names is different from file names.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Change-Id: I7e992357851c2a86711f4da1241c4d507359e56b
diff --git a/drm/DrmDevice.cpp b/drm/DrmDevice.cpp
new file mode 100644
index 0000000..28ecfda
--- /dev/null
+++ b/drm/DrmDevice.cpp
@@ -0,0 +1,579 @@
+/*
+ * Copyright (C) 2015 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 "hwc-drm-device"
+
+#include "DrmDevice.h"
+
+#include <cutils/properties.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <log/log.h>
+#include <stdint.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include <algorithm>
+#include <array>
+#include <cinttypes>
+#include <string>
+
+static void trim_left(std::string &str) {
+  str.erase(std::begin(str),
+            std::find_if(std::begin(str), std::end(str),
+                         [](int ch) { return !std::isspace(ch); }));
+}
+
+static void trim_right(std::string &str) {
+  str.erase(std::find_if(std::rbegin(str), std::rend(str),
+                         [](int ch) { return !std::isspace(ch); })
+                .base(),
+            std::end(str));
+}
+
+static void trim(std::string &str) {
+  trim_left(str);
+  trim_right(str);
+}
+
+namespace android {
+
+static std::vector<std::string> read_primary_display_order_prop() {
+  std::array<char, PROPERTY_VALUE_MAX> display_order_buf;
+  property_get("vendor.hwc.drm.primary_display_order", display_order_buf.data(),
+               "...");
+
+  std::vector<std::string> display_order;
+  std::istringstream str(display_order_buf.data());
+  for (std::string conn_name = ""; std::getline(str, conn_name, ',');) {
+    trim(conn_name);
+    display_order.push_back(std::move(conn_name));
+  }
+  return display_order;
+}
+
+static std::vector<DrmConnector *> make_primary_display_candidates(
+    std::vector<std::unique_ptr<DrmConnector>> &connectors) {
+  std::vector<DrmConnector *> primary_candidates;
+  std::transform(std::begin(connectors), std::end(connectors),
+                 std::back_inserter(primary_candidates),
+                 [](std::unique_ptr<DrmConnector> &conn) {
+                   return conn.get();
+                 });
+  primary_candidates.erase(std::remove_if(std::begin(primary_candidates),
+                                          std::end(primary_candidates),
+                                          [](const DrmConnector *conn) {
+                                            return conn->state() !=
+                                                   DRM_MODE_CONNECTED;
+                                          }),
+                           std::end(primary_candidates));
+
+  std::vector<std::string> display_order = read_primary_display_order_prop();
+  bool use_other = display_order.back() == "...";
+
+  // putting connectors from primary_display_order first
+  auto curr_connector = std::begin(primary_candidates);
+  for (const std::string &display_name : display_order) {
+    auto it = std::find_if(std::begin(primary_candidates),
+                           std::end(primary_candidates),
+                           [&display_name](const DrmConnector *conn) {
+                             return conn->name() == display_name;
+                           });
+    if (it != std::end(primary_candidates)) {
+      std::iter_swap(it, curr_connector);
+      ++curr_connector;
+    }
+  }
+
+  if (use_other) {
+    // then putting internal connectors second, everything else afterwards
+    std::partition(curr_connector, std::end(primary_candidates),
+                   [](const DrmConnector *conn) { return conn->internal(); });
+  } else {
+    primary_candidates.erase(curr_connector, std::end(primary_candidates));
+  }
+
+  return primary_candidates;
+}
+
+DrmDevice::DrmDevice() : event_listener_(this) {
+}
+
+DrmDevice::~DrmDevice() {
+  event_listener_.Exit();
+}
+
+std::tuple<int, int> DrmDevice::Init(const char *path, int num_displays) {
+  /* TODO: Use drmOpenControl here instead */
+  fd_.Set(open(path, O_RDWR));
+  if (fd() < 0) {
+    ALOGE("Failed to open dri %s: %s", path, strerror(errno));
+    return std::make_tuple(-ENODEV, 0);
+  }
+
+  int ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
+  if (ret) {
+    ALOGE("Failed to set universal plane cap %d", ret);
+    return std::make_tuple(ret, 0);
+  }
+
+  ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_ATOMIC, 1);
+  if (ret) {
+    ALOGE("Failed to set atomic cap %d", ret);
+    return std::make_tuple(ret, 0);
+  }
+
+#ifdef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
+  ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
+  if (ret) {
+    ALOGI("Failed to set writeback cap %d", ret);
+    ret = 0;
+  }
+#endif
+
+  drmModeResPtr res = drmModeGetResources(fd());
+  if (!res) {
+    ALOGE("Failed to get DrmDevice resources");
+    return std::make_tuple(-ENODEV, 0);
+  }
+
+  min_resolution_ = std::pair<uint32_t, uint32_t>(res->min_width,
+                                                  res->min_height);
+  max_resolution_ = std::pair<uint32_t, uint32_t>(res->max_width,
+                                                  res->max_height);
+
+  // Assumes that the primary display will always be in the first
+  // drm_device opened.
+  bool found_primary = num_displays != 0;
+
+  for (int i = 0; !ret && i < res->count_crtcs; ++i) {
+    drmModeCrtcPtr c = drmModeGetCrtc(fd(), res->crtcs[i]);
+    if (!c) {
+      ALOGE("Failed to get crtc %d", res->crtcs[i]);
+      ret = -ENODEV;
+      break;
+    }
+
+    std::unique_ptr<DrmCrtc> crtc(new DrmCrtc(this, c, i));
+    drmModeFreeCrtc(c);
+
+    ret = crtc->Init();
+    if (ret) {
+      ALOGE("Failed to initialize crtc %d", res->crtcs[i]);
+      break;
+    }
+    crtcs_.emplace_back(std::move(crtc));
+  }
+
+  std::vector<int> possible_clones;
+  for (int i = 0; !ret && i < res->count_encoders; ++i) {
+    drmModeEncoderPtr e = drmModeGetEncoder(fd(), res->encoders[i]);
+    if (!e) {
+      ALOGE("Failed to get encoder %d", res->encoders[i]);
+      ret = -ENODEV;
+      break;
+    }
+
+    std::vector<DrmCrtc *> possible_crtcs;
+    DrmCrtc *current_crtc = NULL;
+    for (auto &crtc : crtcs_) {
+      if ((1 << crtc->pipe()) & e->possible_crtcs)
+        possible_crtcs.push_back(crtc.get());
+
+      if (crtc->id() == e->crtc_id)
+        current_crtc = crtc.get();
+    }
+
+    std::unique_ptr<DrmEncoder> enc(
+        new DrmEncoder(e, current_crtc, possible_crtcs));
+    possible_clones.push_back(e->possible_clones);
+    drmModeFreeEncoder(e);
+
+    encoders_.emplace_back(std::move(enc));
+  }
+
+  for (unsigned int i = 0; i < encoders_.size(); i++) {
+    for (unsigned int j = 0; j < encoders_.size(); j++)
+      if (possible_clones[i] & (1 << j))
+        encoders_[i]->AddPossibleClone(encoders_[j].get());
+  }
+
+  for (int i = 0; !ret && i < res->count_connectors; ++i) {
+    drmModeConnectorPtr c = drmModeGetConnector(fd(), res->connectors[i]);
+    if (!c) {
+      ALOGE("Failed to get connector %d", res->connectors[i]);
+      ret = -ENODEV;
+      break;
+    }
+
+    std::vector<DrmEncoder *> possible_encoders;
+    DrmEncoder *current_encoder = NULL;
+    for (int j = 0; j < c->count_encoders; ++j) {
+      for (auto &encoder : encoders_) {
+        if (encoder->id() == c->encoders[j])
+          possible_encoders.push_back(encoder.get());
+        if (encoder->id() == c->encoder_id)
+          current_encoder = encoder.get();
+      }
+    }
+
+    std::unique_ptr<DrmConnector> conn(
+        new DrmConnector(this, c, current_encoder, possible_encoders));
+
+    drmModeFreeConnector(c);
+
+    ret = conn->Init();
+    if (ret) {
+      ALOGE("Init connector %d failed", res->connectors[i]);
+      break;
+    }
+
+    if (conn->writeback())
+      writeback_connectors_.emplace_back(std::move(conn));
+    else
+      connectors_.emplace_back(std::move(conn));
+  }
+
+  // Primary display priority:
+  // 1) vendor.hwc.drm.primary_display_order property
+  // 2) internal connectors
+  // 3) anything else
+  std::vector<DrmConnector *>
+      primary_candidates = make_primary_display_candidates(connectors_);
+  if (!primary_candidates.empty() && !found_primary) {
+    DrmConnector &conn = **std::begin(primary_candidates);
+    conn.set_display(num_displays);
+    displays_[num_displays] = num_displays;
+    ++num_displays;
+    found_primary = true;
+  } else {
+    ALOGE(
+        "Failed to find primary display from "
+        "\"vendor.hwc.drm.primary_display_order\" property");
+  }
+
+  // If no priority display were found then pick first available as primary and
+  // for the others assign consecutive display_numbers.
+  for (auto &conn : connectors_) {
+    if (conn->external() || conn->internal()) {
+      if (!found_primary) {
+        conn->set_display(num_displays);
+        displays_[num_displays] = num_displays;
+        found_primary = true;
+        ++num_displays;
+      } else if (conn->display() < 0) {
+        conn->set_display(num_displays);
+        displays_[num_displays] = num_displays;
+        ++num_displays;
+      }
+    }
+  }
+
+  if (res)
+    drmModeFreeResources(res);
+
+  // Catch-all for the above loops
+  if (ret)
+    return std::make_tuple(ret, 0);
+
+  drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd());
+  if (!plane_res) {
+    ALOGE("Failed to get plane resources");
+    return std::make_tuple(-ENOENT, 0);
+  }
+
+  for (uint32_t i = 0; i < plane_res->count_planes; ++i) {
+    drmModePlanePtr p = drmModeGetPlane(fd(), plane_res->planes[i]);
+    if (!p) {
+      ALOGE("Failed to get plane %d", plane_res->planes[i]);
+      ret = -ENODEV;
+      break;
+    }
+
+    std::unique_ptr<DrmPlane> plane(new DrmPlane(this, p));
+
+    drmModeFreePlane(p);
+
+    ret = plane->Init();
+    if (ret) {
+      ALOGE("Init plane %d failed", plane_res->planes[i]);
+      break;
+    }
+
+    planes_.emplace_back(std::move(plane));
+  }
+  drmModeFreePlaneResources(plane_res);
+  if (ret)
+    return std::make_tuple(ret, 0);
+
+  ret = event_listener_.Init();
+  if (ret) {
+    ALOGE("Can't initialize event listener %d", ret);
+    return std::make_tuple(ret, 0);
+  }
+
+  for (auto &conn : connectors_) {
+    ret = CreateDisplayPipe(conn.get());
+    if (ret) {
+      ALOGE("Failed CreateDisplayPipe %d with %d", conn->id(), ret);
+      return std::make_tuple(ret, 0);
+    }
+    if (!AttachWriteback(conn.get())) {
+      ALOGI("Display %d has writeback attach to it", conn->display());
+    }
+  }
+  return std::make_tuple(ret, displays_.size());
+}
+
+bool DrmDevice::HandlesDisplay(int display) const {
+  return displays_.find(display) != displays_.end();
+}
+
+DrmConnector *DrmDevice::GetConnectorForDisplay(int display) const {
+  for (auto &conn : connectors_) {
+    if (conn->display() == display)
+      return conn.get();
+  }
+  return NULL;
+}
+
+DrmConnector *DrmDevice::GetWritebackConnectorForDisplay(int display) const {
+  for (auto &conn : writeback_connectors_) {
+    if (conn->display() == display)
+      return conn.get();
+  }
+  return NULL;
+}
+
+// TODO what happens when hotplugging
+DrmConnector *DrmDevice::AvailableWritebackConnector(int display) const {
+  DrmConnector *writeback_conn = GetWritebackConnectorForDisplay(display);
+  DrmConnector *display_conn = GetConnectorForDisplay(display);
+  // If we have a writeback already attached to the same CRTC just use that,
+  // if possible.
+  if (display_conn && writeback_conn &&
+      writeback_conn->encoder()->CanClone(display_conn->encoder()))
+    return writeback_conn;
+
+  // Use another CRTC if available and doesn't have any connector
+  for (auto &crtc : crtcs_) {
+    if (crtc->display() == display)
+      continue;
+    display_conn = GetConnectorForDisplay(crtc->display());
+    // If we have a display connected don't use it for writeback
+    if (display_conn && display_conn->state() == DRM_MODE_CONNECTED)
+      continue;
+    writeback_conn = GetWritebackConnectorForDisplay(crtc->display());
+    if (writeback_conn)
+      return writeback_conn;
+  }
+  return NULL;
+}
+
+DrmCrtc *DrmDevice::GetCrtcForDisplay(int display) const {
+  for (auto &crtc : crtcs_) {
+    if (crtc->display() == display)
+      return crtc.get();
+  }
+  return NULL;
+}
+
+DrmPlane *DrmDevice::GetPlane(uint32_t id) const {
+  for (auto &plane : planes_) {
+    if (plane->id() == id)
+      return plane.get();
+  }
+  return NULL;
+}
+
+const std::vector<std::unique_ptr<DrmCrtc>> &DrmDevice::crtcs() const {
+  return crtcs_;
+}
+
+uint32_t DrmDevice::next_mode_id() {
+  return ++mode_id_;
+}
+
+int DrmDevice::TryEncoderForDisplay(int display, DrmEncoder *enc) {
+  /* First try to use the currently-bound crtc */
+  DrmCrtc *crtc = enc->crtc();
+  if (crtc && crtc->can_bind(display)) {
+    crtc->set_display(display);
+    enc->set_crtc(crtc);
+    return 0;
+  }
+
+  /* Try to find a possible crtc which will work */
+  for (DrmCrtc *crtc : enc->possible_crtcs()) {
+    /* We've already tried this earlier */
+    if (crtc == enc->crtc())
+      continue;
+
+    if (crtc->can_bind(display)) {
+      crtc->set_display(display);
+      enc->set_crtc(crtc);
+      return 0;
+    }
+  }
+
+  /* We can't use the encoder, but nothing went wrong, try another one */
+  return -EAGAIN;
+}
+
+int DrmDevice::CreateDisplayPipe(DrmConnector *connector) {
+  int display = connector->display();
+  /* Try to use current setup first */
+  if (connector->encoder()) {
+    int ret = TryEncoderForDisplay(display, connector->encoder());
+    if (!ret) {
+      return 0;
+    } else if (ret != -EAGAIN) {
+      ALOGE("Could not set mode %d/%d", display, ret);
+      return ret;
+    }
+  }
+
+  for (DrmEncoder *enc : connector->possible_encoders()) {
+    int ret = TryEncoderForDisplay(display, enc);
+    if (!ret) {
+      connector->set_encoder(enc);
+      return 0;
+    } else if (ret != -EAGAIN) {
+      ALOGE("Could not set mode %d/%d", display, ret);
+      return ret;
+    }
+  }
+  ALOGE("Could not find a suitable encoder/crtc for display %d",
+        connector->display());
+  return -ENODEV;
+}
+
+// Attach writeback connector to the CRTC linked to the display_conn
+int DrmDevice::AttachWriteback(DrmConnector *display_conn) {
+  DrmCrtc *display_crtc = display_conn->encoder()->crtc();
+  if (GetWritebackConnectorForDisplay(display_crtc->display()) != NULL) {
+    ALOGE("Display already has writeback attach to it");
+    return -EINVAL;
+  }
+  for (auto &writeback_conn : writeback_connectors_) {
+    if (writeback_conn->display() >= 0)
+      continue;
+    for (DrmEncoder *writeback_enc : writeback_conn->possible_encoders()) {
+      for (DrmCrtc *possible_crtc : writeback_enc->possible_crtcs()) {
+        if (possible_crtc != display_crtc)
+          continue;
+        // Use just encoders which had not been bound already
+        if (writeback_enc->can_bind(display_crtc->display())) {
+          writeback_enc->set_crtc(display_crtc);
+          writeback_conn->set_encoder(writeback_enc);
+          writeback_conn->set_display(display_crtc->display());
+          writeback_conn->UpdateModes();
+          return 0;
+        }
+      }
+    }
+  }
+  return -EINVAL;
+}
+
+int DrmDevice::CreatePropertyBlob(void *data, size_t length,
+                                  uint32_t *blob_id) {
+  struct drm_mode_create_blob create_blob;
+  memset(&create_blob, 0, sizeof(create_blob));
+  create_blob.length = length;
+  create_blob.data = (__u64)data;
+
+  int ret = drmIoctl(fd(), DRM_IOCTL_MODE_CREATEPROPBLOB, &create_blob);
+  if (ret) {
+    ALOGE("Failed to create mode property blob %d", ret);
+    return ret;
+  }
+  *blob_id = create_blob.blob_id;
+  return 0;
+}
+
+int DrmDevice::DestroyPropertyBlob(uint32_t blob_id) {
+  if (!blob_id)
+    return 0;
+
+  struct drm_mode_destroy_blob destroy_blob;
+  memset(&destroy_blob, 0, sizeof(destroy_blob));
+  destroy_blob.blob_id = (__u32)blob_id;
+  int ret = drmIoctl(fd(), DRM_IOCTL_MODE_DESTROYPROPBLOB, &destroy_blob);
+  if (ret) {
+    ALOGE("Failed to destroy mode property blob %" PRIu32 "/%d", blob_id, ret);
+    return ret;
+  }
+  return 0;
+}
+
+DrmEventListener *DrmDevice::event_listener() {
+  return &event_listener_;
+}
+
+int DrmDevice::GetProperty(uint32_t obj_id, uint32_t obj_type,
+                           const char *prop_name, DrmProperty *property) {
+  drmModeObjectPropertiesPtr props;
+
+  props = drmModeObjectGetProperties(fd(), obj_id, obj_type);
+  if (!props) {
+    ALOGE("Failed to get properties for %d/%x", obj_id, obj_type);
+    return -ENODEV;
+  }
+
+  bool found = false;
+  for (int i = 0; !found && (size_t)i < props->count_props; ++i) {
+    drmModePropertyPtr p = drmModeGetProperty(fd(), props->props[i]);
+    if (!strcmp(p->name, prop_name)) {
+      property->Init(p, props->prop_values[i]);
+      found = true;
+    }
+    drmModeFreeProperty(p);
+  }
+
+  drmModeFreeObjectProperties(props);
+  return found ? 0 : -ENOENT;
+}
+
+int DrmDevice::GetPlaneProperty(const DrmPlane &plane, const char *prop_name,
+                                DrmProperty *property) {
+  return GetProperty(plane.id(), DRM_MODE_OBJECT_PLANE, prop_name, property);
+}
+
+int DrmDevice::GetCrtcProperty(const DrmCrtc &crtc, const char *prop_name,
+                               DrmProperty *property) {
+  return GetProperty(crtc.id(), DRM_MODE_OBJECT_CRTC, prop_name, property);
+}
+
+int DrmDevice::GetConnectorProperty(const DrmConnector &connector,
+                                    const char *prop_name,
+                                    DrmProperty *property) {
+  return GetProperty(connector.id(), DRM_MODE_OBJECT_CONNECTOR, prop_name,
+                     property);
+}
+
+const std::string DrmDevice::GetName() const {
+  auto ver = drmGetVersion(fd_.get());
+  if (!ver) {
+    ALOGW("Failed to get drm version for fd=%d", fd_.get());
+    return "generic";
+  }
+
+  std::string name(ver->name);
+  drmFreeVersion(ver);
+  return name;
+}
+}  // namespace android