redwood: Implement torch light control

Signed-off-by: rahul <rahul@aospa.co>
Co-Authored-By: rahul <rahul@aospa.co>
Co-Authored-By: John Galt <7730016+realjohngalt@users.noreply.github.com>

BoardConfig.mk

@@ -50,6 +50,7 @@ TARGET_BOOTLOADER_BOARD_NAME := redwood
 TARGET_NO_BOOTLOADER := true
 
 # Camera
+TARGET_CAMERA_SERVICE_EXT_LIB := //$(DEVICE_PATH):libcameraservice_extension.xiaomi_redwood
 TARGET_CAMERA_OVERRIDE_FORMAT_FROM_RESERVED := true
 TARGET_CAMERA_PACKAGE_NAME := com.android.camera
 

camera/Android.bp

@@ -0,0 +1,22 @@
+//
+// Copyright (C) 2022 The LineageOS 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.
+
+cc_library_static {
+    name: "libcameraservice_extension.xiaomi_redwood",
+    srcs: ["CameraProviderExtension.cpp"],
+    include_dirs: [
+        "frameworks/av/services/camera/libcameraservice/common"
+    ],
+}

camera/CameraProviderExtension.cpp

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2024 LibreMobileOS Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "CameraProviderExtension.h"
+
+#include <fstream>
+
+#define TORCH_BRIGHTNESS "brightness"
+#define TORCH_MAX_BRIGHTNESS "max_brightness"
+#define TOGGLE_SWITCH "/sys/devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:switch_0/brightness"
+static std::string kTorchLedPath = "/sys/devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:torch_0";
+
+/**
+ * Write value to path and close file.
+ */
+template <typename T>
+static void set(const std::string& path, const T& value) {
+    std::ofstream file(path);
+    file << value;
+}
+
+/**
+ * Read value from the path and close file.
+ */
+template <typename T>
+static T get(const std::string& path, const T& def) {
+    std::ifstream file(path);
+    T result;
+
+    file >> result;
+    return file.fail() ? def : result;
+}
+
+bool supportsTorchStrengthControlExt() {
+    return true;
+}
+
+bool supportsSetTorchModeExt() {
+    return false;
+}
+
+int32_t getTorchDefaultStrengthLevelExt() {
+    // Our default value is 75. This corresponds to 15%.
+    // As we have changed the maximum value, 59% now corresponds to 75.
+    return 59;
+}
+
+int32_t getTorchMaxStrengthLevelExt() {
+    // 255 out of 500 is a sane brightness.
+    // Let's cap it to 255 as max, we can go much higher, but I don't want to test this.
+    return 255;
+}
+
+int32_t getTorchStrengthLevelExt() {
+    // We write same value in the both LEDs,
+    // so get from one.
+    auto node = kTorchLedPath + "/" + TORCH_BRIGHTNESS;
+    return get(node, 0);
+}
+
+void setTorchStrengthLevelExt(int32_t torchStrength, bool enabled) {
+    set(TOGGLE_SWITCH, 0);
+    auto node = kTorchLedPath + "/" + TORCH_BRIGHTNESS;
+    set(node, torchStrength);
+    if (enabled)
+        set(TOGGLE_SWITCH, 255);
+}
+
+void setTorchModeExt(bool enabled) {
+    int32_t strength = getTorchDefaultStrengthLevelExt();
+    setTorchStrengthLevelExt(enabled ? strength : 0, enabled);
+}

rootdir/etc/ueventd.rc

@@ -143,3 +143,7 @@ firmware_directories /vendor/firmware_mnt/image/
 
 # Fingerprint
 /dev/goodix_fp            0660   system     system
+
+# Torch control
+/sys/devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:torch_0 brightness 0660 cameraserver camera
+/sys/devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:switch_0 0660 cameraserver camera

sepolicy/vendor/cameraserver.te

@@ -0,0 +1 @@
+allow cameraserver sysfs_torch:file rw_file_perms;

sepolicy/vendor/genfs_contexts

@@ -4,6 +4,11 @@ genfscon sysfs /devices/platform/soc/soc:qcom,dsi-display-primary u:object_r:ven
 # USB
 genfscon sysfs /devices/platform/soc/soc:qcom,pmic_glink/soc:qcom,pmic_glink:qcom,ucsi/typec u:object_r:vendor_sysfs_usb_c:s0
 
+# Torch control
+genfscon sysfs /devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:torch_0/brightness u:object_r:sysfs_torch:s0
+genfscon sysfs /devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:torch_0/max_brightness u:object_r:sysfs_torch:s0
+genfscon sysfs /devices/platform/soc/c440000.qcom,spmi/spmi-0/spmi0-02/c440000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:switch_0/brightness u:object_r:sysfs_torch:s0
+
 # Wakeup nodes
 genfscon sysfs /devices/platform/goodix_ts.0/wakeup u:object_r:sysfs_wakeup:s0
 genfscon sysfs /devices/platform/soc/17300000.qcom,lpass/subsys6/wakeup u:object_r:sysfs_wakeup:s0

sepolicy/vendor/torch.te

@@ -0,0 +1 @@
+type sysfs_torch, fs_type, sysfs_type;