325 lines
10 KiB
C++
325 lines
10 KiB
C++
/*
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* Copyright (C) 2022 The LineageOS Project
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define LOG_TAG "UdfpsHandler.xiaomi_sm8450"
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/unique_fd.h>
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#include <poll.h>
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#include <sys/ioctl.h>
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#include <fstream>
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#include <thread>
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#include <display/drm/mi_disp.h>
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#include "UdfpsHandler.h"
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#include "xiaomi_touch.h"
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#define COMMAND_NIT 10
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#define TARGET_BRIGHTNESS_OFF 0
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#define TARGET_BRIGHTNESS_1000NIT 1
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#define TARGET_BRIGHTNESS_110NIT 6
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#define LOW_BRIGHTNESS_THRESHHOLD 100
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#define COMMAND_FOD_PRESS_STATUS 1
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#define COMMAND_FOD_PRESS_X 2
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#define COMMAND_FOD_PRESS_Y 3
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#define PARAM_FOD_PRESSED 1
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#define PARAM_FOD_RELEASED 0
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#define FOD_STATUS_OFF 0
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#define FOD_STATUS_ON 1
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#define TOUCH_DEV_PATH "/dev/xiaomi-touch"
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#define TOUCH_MAGIC 'T'
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#define TOUCH_IOC_SET_CUR_VALUE _IO(TOUCH_MAGIC, SET_CUR_VALUE)
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#define TOUCH_IOC_GET_CUR_VALUE _IO(TOUCH_MAGIC, GET_CUR_VALUE)
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#define DISP_FEATURE_PATH "/dev/mi_display/disp_feature"
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#define FOD_PRESS_STATUS_PATH "/sys/class/touch/touch_dev/fod_press_status"
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namespace {
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static bool readBool(int fd) {
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char c;
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int rc;
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rc = lseek(fd, 0, SEEK_SET);
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if (rc) {
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LOG(ERROR) << "failed to seek fd, err: " << rc;
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return false;
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}
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rc = read(fd, &c, sizeof(char));
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if (rc != 1) {
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LOG(ERROR) << "failed to read bool from fd, err: " << rc;
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return false;
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}
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return c != '0';
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}
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static disp_event_resp* parseDispEvent(int fd) {
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disp_event header;
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ssize_t headerSize = read(fd, &header, sizeof(header));
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if (headerSize < sizeof(header)) {
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LOG(ERROR) << "unexpected display event header size: " << headerSize;
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return nullptr;
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}
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struct disp_event_resp* response =
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reinterpret_cast<struct disp_event_resp*>(malloc(header.length));
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response->base = header;
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int dataLength = response->base.length - sizeof(response->base);
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if (dataLength < 0) {
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LOG(ERROR) << "invalid data length: " << response->base.length;
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return nullptr;
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}
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ssize_t dataSize = read(fd, &response->data, dataLength);
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if (dataSize < dataLength) {
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LOG(ERROR) << "unexpected display event data size: " << dataSize;
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return nullptr;
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}
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return response;
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}
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} // anonymous namespace
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class XiaomiSm8450UdfpsHander : public UdfpsHandler {
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public:
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void init(fingerprint_device_t* device) {
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mDevice = device;
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touch_fd_ = android::base::unique_fd(open(TOUCH_DEV_PATH, O_RDWR));
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disp_fd_ = android::base::unique_fd(open(DISP_FEATURE_PATH, O_RDWR));
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std::string fpVendor = android::base::GetProperty("persist.vendor.sys.fp.vendor", "none");
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LOG(DEBUG) << __func__ << "fingerprint vendor is: " << fpVendor;
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isFpcFod = fpVendor == "fpc_fod";
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// Thread to notify fingeprint hwmodule about fod presses
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std::thread([this]() {
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int fd = open(FOD_PRESS_STATUS_PATH, O_RDONLY);
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if (fd < 0) {
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LOG(ERROR) << "failed to open " << FOD_PRESS_STATUS_PATH << " , err: " << fd;
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return;
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}
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struct pollfd fodPressStatusPoll = {
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.fd = fd,
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.events = POLLERR | POLLPRI,
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.revents = 0,
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};
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while (true) {
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int rc = poll(&fodPressStatusPoll, 1, -1);
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if (rc < 0) {
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LOG(ERROR) << "failed to poll " << FOD_PRESS_STATUS_PATH << ", err: " << rc;
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continue;
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}
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bool pressed = readBool(fd);
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mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_X, pressed ? lastPressX : 0);
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mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_Y, pressed ? lastPressY : 0);
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mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_STATUS,
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pressed ? PARAM_FOD_PRESSED : PARAM_FOD_RELEASED);
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// Get brightness
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struct disp_brightness_req brightness_req;
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int brightness = LOW_BRIGHTNESS_THRESHHOLD;
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brightness_req.base.flag = 0;
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brightness_req.base.disp_id = MI_DISP_PRIMARY;
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rc = ioctl(disp_fd_.get(), MI_DISP_IOCTL_GET_BRIGHTNESS, &brightness_req);
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if (rc) {
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LOG(ERROR) << "failed to get brightness, err: " << rc;
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} else if (brightness_req.brightness > 0) {
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brightness = brightness_req.brightness;
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}
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LOG(DEBUG) << "brightness is: " << (int)brightness_req.brightness;
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bool requestLowBrightness = !enrolling && brightness < LOW_BRIGHTNESS_THRESHHOLD;
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// Request HBM
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disp_local_hbm_req req;
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req.base.flag = 0;
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req.base.disp_id = MI_DISP_PRIMARY;
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req.local_hbm_value =
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pressed ? (requestLowBrightness ? LHBM_TARGET_BRIGHTNESS_WHITE_110NIT
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: LHBM_TARGET_BRIGHTNESS_WHITE_1000NIT)
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: LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
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ioctl(disp_fd_.get(), MI_DISP_IOCTL_SET_LOCAL_HBM, &req);
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}
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}).detach();
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// Thread to listen for fod ui changes
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std::thread([this]() {
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int fd = open(DISP_FEATURE_PATH, O_RDWR);
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if (fd < 0) {
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LOG(ERROR) << "failed to open " << DISP_FEATURE_PATH << " , err: " << fd;
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return;
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}
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// Register for FOD events
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disp_event_req req;
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req.base.flag = 0;
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req.base.disp_id = MI_DISP_PRIMARY;
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req.type = MI_DISP_EVENT_FOD;
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ioctl(fd, MI_DISP_IOCTL_REGISTER_EVENT, &req);
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struct pollfd dispEventPoll = {
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.fd = fd,
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.events = POLLIN,
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.revents = 0,
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};
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while (true) {
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int rc = poll(&dispEventPoll, 1, -1);
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if (rc < 0) {
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LOG(ERROR) << "failed to poll " << FOD_PRESS_STATUS_PATH << ", err: " << rc;
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continue;
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}
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struct disp_event_resp* response = parseDispEvent(fd);
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if (response == nullptr) {
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continue;
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}
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if (response->base.type != MI_DISP_EVENT_FOD) {
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LOG(ERROR) << "unexpected display event: " << response->base.type;
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continue;
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}
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int value = response->data[0];
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LOG(DEBUG) << "received data: " << std::bitset<8>(value);
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bool localHbmUiReady = value & LOCAL_HBM_UI_READY;
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bool requestLowBrightnessCapture = value & FOD_LOW_BRIGHTNESS_CAPTURE;
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mDevice->extCmd(mDevice, COMMAND_NIT,
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localHbmUiReady
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? (requestLowBrightnessCapture ? TARGET_BRIGHTNESS_110NIT
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: TARGET_BRIGHTNESS_1000NIT)
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: TARGET_BRIGHTNESS_OFF);
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}
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}).detach();
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}
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void onFingerDown(uint32_t x, uint32_t y, float /*minor*/, float /*major*/) {
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LOG(DEBUG) << __func__ << "x: " << x << ", y: " << y;
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// Track x and y coordinates
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lastPressX = x;
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lastPressY = y;
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/*
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* On fpc_fod devices, the waiting for finger message is not reliably sent...
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* The finger down message is only reliably sent when the screen is turned off, so enable
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* fod_status better late than never.
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*/
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if (isFpcFod) {
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setFodStatus(FOD_STATUS_ON);
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}
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// Ensure touchscreen is aware of the press state, ideally this is not needed
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setFingerDown(true);
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}
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void onFingerUp() {
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LOG(DEBUG) << __func__;
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// Ensure touchscreen is aware of the press state, ideally this is not needed
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setFingerDown(false);
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}
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void onAcquired(int32_t result, int32_t vendorCode) {
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LOG(DEBUG) << __func__ << " result: " << result << " vendorCode: " << vendorCode;
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if (result == FINGERPRINT_ACQUIRED_GOOD) {
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// Request to disable HBM already, even if the finger is still pressed
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disp_local_hbm_req req;
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req.base.flag = 0;
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req.base.disp_id = MI_DISP_PRIMARY;
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req.local_hbm_value = LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
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ioctl(disp_fd_.get(), MI_DISP_IOCTL_SET_LOCAL_HBM, &req);
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if (!enrolling) {
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setFodStatus(FOD_STATUS_OFF);
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}
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}
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/* vendorCode for goodix_fod devices:
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* 21: waiting for finger
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* 22: finger down
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* 23: finger up
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* On fpc_fod devices, the waiting for finger message is not reliably sent...
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* The finger down message is only reliably sent when the screen is turned off, so enable
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* fod_status better late than never.
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*/
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if (!isFpcFod && vendorCode == 21) {
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setFodStatus(FOD_STATUS_ON);
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} else if (isFpcFod && vendorCode == 22) {
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setFodStatus(FOD_STATUS_ON);
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}
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}
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void cancel() {
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LOG(DEBUG) << __func__;
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enrolling = false;
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setFodStatus(FOD_STATUS_OFF);
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}
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void preEnroll() {
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LOG(DEBUG) << __func__;
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enrolling = true;
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}
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void enroll() {
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LOG(DEBUG) << __func__;
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enrolling = true;
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}
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void postEnroll() {
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LOG(DEBUG) << __func__;
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enrolling = false;
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setFodStatus(FOD_STATUS_OFF);
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}
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private:
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fingerprint_device_t* mDevice;
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android::base::unique_fd touch_fd_;
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android::base::unique_fd disp_fd_;
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bool isFpcFod;
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bool enrolling = false;
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uint32_t lastPressX, lastPressY;
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void setFodStatus(int value) {
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int buf[MAX_BUF_SIZE] = {MI_DISP_PRIMARY, Touch_Fod_Enable, value};
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ioctl(touch_fd_.get(), TOUCH_IOC_SET_CUR_VALUE, &buf);
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}
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void setFingerDown(bool pressed) {
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int buf[MAX_BUF_SIZE] = {MI_DISP_PRIMARY, THP_FOD_DOWNUP_CTL, pressed ? 1 : 0};
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ioctl(touch_fd_.get(), TOUCH_IOC_SET_CUR_VALUE, &buf);
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}
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};
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static UdfpsHandler* create() {
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return new XiaomiSm8450UdfpsHander();
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}
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static void destroy(UdfpsHandler* handler) {
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delete handler;
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}
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extern "C" UdfpsHandlerFactory UDFPS_HANDLER_FACTORY = {
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.create = create,
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.destroy = destroy,
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};
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