UdfpsHandler.cpp 7.2 KB

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  1. /*
  2. * Copyright (C) 2022 The LineageOS Project
  3. *
  4. * SPDX-License-Identifier: Apache-2.0
  5. */
  6. #define LOG_TAG "UdfpsHandler.xiaomi_sm8450"
  7. #include <android-base/logging.h>
  8. #include <android-base/properties.h>
  9. #include <android-base/unique_fd.h>
  10. #include <poll.h>
  11. #include <sys/ioctl.h>
  12. #include <fstream>
  13. #include <thread>
  14. #include <display/drm/mi_disp.h>
  15. #include <linux/xiaomi_touch.h>
  16. #include "UdfpsHandler.h"
  17. #define COMMAND_NIT 10
  18. #define TARGET_BRIGHTNESS_OFF 0
  19. #define TARGET_BRIGHTNESS_1000NIT 1
  20. #define TARGET_BRIGHTNESS_110NIT 6
  21. #define LOW_BRIGHTNESS_THRESHHOLD 100
  22. #define COMMAND_FOD_PRESS_STATUS 1
  23. #define COMMAND_FOD_PRESS_X 2
  24. #define COMMAND_FOD_PRESS_Y 3
  25. #define PARAM_FOD_PRESSED 1
  26. #define PARAM_FOD_RELEASED 0
  27. #define DISP_FEATURE_PATH "/dev/mi_display/disp_feature"
  28. #define TOUCH_DEV_PATH "/dev/xiaomi-touch"
  29. #define FOD_PRESS_STATUS_PATH "/sys/class/touch/touch_dev/fod_press_status"
  30. namespace {
  31. static bool readBool(int fd) {
  32. char c;
  33. int rc;
  34. rc = lseek(fd, 0, SEEK_SET);
  35. if (rc) {
  36. LOG(ERROR) << "failed to seek fd, err: " << rc;
  37. return false;
  38. }
  39. rc = read(fd, &c, sizeof(char));
  40. if (rc != 1) {
  41. LOG(ERROR) << "failed to read bool from fd, err: " << rc;
  42. return false;
  43. }
  44. return c != '0';
  45. }
  46. static disp_event_resp* parseDispEvent(int fd) {
  47. disp_event header;
  48. ssize_t headerSize = read(fd, &header, sizeof(header));
  49. if (headerSize < sizeof(header)) {
  50. LOG(ERROR) << "unexpected display event header size: " << headerSize;
  51. return nullptr;
  52. }
  53. struct disp_event_resp* response =
  54. reinterpret_cast<struct disp_event_resp*>(malloc(header.length));
  55. response->base = header;
  56. int dataLength = response->base.length - sizeof(response->base);
  57. if (dataLength < 0) {
  58. LOG(ERROR) << "invalid data length: " << response->base.length;
  59. return nullptr;
  60. }
  61. ssize_t dataSize = read(fd, &response->data, dataLength);
  62. if (dataSize < dataLength) {
  63. LOG(ERROR) << "unexpected display event data size: " << dataSize;
  64. return nullptr;
  65. }
  66. return response;
  67. }
  68. } // anonymous namespace
  69. class XiaomiSm8450UdfpsHander : public UdfpsHandler {
  70. public:
  71. void init(fingerprint_device_t* device) {
  72. mDevice = device;
  73. touch_fd_ = android::base::unique_fd(open(TOUCH_DEV_PATH, O_RDWR));
  74. disp_fd_ = android::base::unique_fd(open(DISP_FEATURE_PATH, O_RDWR));
  75. // Thread to notify fingeprint hwmodule about fod presses
  76. std::thread([this]() {
  77. int fd = open(FOD_PRESS_STATUS_PATH, O_RDONLY);
  78. if (fd < 0) {
  79. LOG(ERROR) << "failed to open " << FOD_PRESS_STATUS_PATH << " , err: " << fd;
  80. return;
  81. }
  82. struct pollfd fodPressStatusPoll = {
  83. .fd = fd,
  84. .events = POLLERR | POLLPRI,
  85. .revents = 0,
  86. };
  87. while (true) {
  88. int rc = poll(&fodPressStatusPoll, 1, -1);
  89. if (rc < 0) {
  90. LOG(ERROR) << "failed to poll " << FOD_PRESS_STATUS_PATH << ", err: " << rc;
  91. continue;
  92. }
  93. bool pressed = readBool(fd);
  94. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_X, pressed ? lastPressX : 0);
  95. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_Y, pressed ? lastPressY : 0);
  96. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_STATUS,
  97. pressed ? PARAM_FOD_PRESSED : PARAM_FOD_RELEASED);
  98. // Request HBM
  99. disp_local_hbm_req req;
  100. req.base.flag = 0;
  101. req.base.disp_id = MI_DISP_PRIMARY;
  102. req.local_hbm_value = pressed ? LHBM_TARGET_BRIGHTNESS_WHITE_1000NIT
  103. : LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
  104. ioctl(disp_fd_.get(), MI_DISP_IOCTL_SET_LOCAL_HBM, &req);
  105. }
  106. }).detach();
  107. // Thread to listen for fod ui changes
  108. std::thread([this]() {
  109. int fd = open(DISP_FEATURE_PATH, O_RDWR);
  110. if (fd < 0) {
  111. LOG(ERROR) << "failed to open " << DISP_FEATURE_PATH << " , err: " << fd;
  112. return;
  113. }
  114. // Register for FOD events
  115. disp_event_req req;
  116. req.base.flag = 0;
  117. req.base.disp_id = MI_DISP_PRIMARY;
  118. req.type = MI_DISP_EVENT_FOD;
  119. ioctl(fd, MI_DISP_IOCTL_REGISTER_EVENT, &req);
  120. struct pollfd dispEventPoll = {
  121. .fd = fd,
  122. .events = POLLIN,
  123. .revents = 0,
  124. };
  125. while (true) {
  126. int rc = poll(&dispEventPoll, 1, -1);
  127. if (rc < 0) {
  128. LOG(ERROR) << "failed to poll " << DISP_FEATURE_PATH << ", err: " << rc;
  129. continue;
  130. }
  131. struct disp_event_resp* response = parseDispEvent(fd);
  132. if (response == nullptr) {
  133. continue;
  134. }
  135. if (response->base.type != MI_DISP_EVENT_FOD) {
  136. LOG(ERROR) << "unexpected display event: " << response->base.type;
  137. continue;
  138. }
  139. int value = response->data[0];
  140. LOG(DEBUG) << "received data: " << std::bitset<8>(value);
  141. bool localHbmUiReady = value & LOCAL_HBM_UI_READY;
  142. bool requestLowBrightnessCapture = value & FOD_LOW_BRIGHTNESS_CAPTURE;
  143. mDevice->extCmd(mDevice, COMMAND_NIT,
  144. localHbmUiReady
  145. ? (requestLowBrightnessCapture ? TARGET_BRIGHTNESS_110NIT
  146. : TARGET_BRIGHTNESS_1000NIT)
  147. : TARGET_BRIGHTNESS_OFF);
  148. }
  149. }).detach();
  150. }
  151. void onFingerDown(uint32_t x, uint32_t y, float /*minor*/, float /*major*/) {
  152. LOG(DEBUG) << __func__ << "x: " << x << ", y: " << y;
  153. // Track x and y coordinates
  154. lastPressX = x;
  155. lastPressY = y;
  156. // Notify touchscreen about press status
  157. setFingerDown(true);
  158. }
  159. void onFingerUp() {
  160. LOG(DEBUG) << __func__;
  161. // Notify touchscreen about press status
  162. setFingerDown(false);
  163. }
  164. void onAcquired(int32_t result, int32_t vendorCode) {
  165. LOG(DEBUG) << __func__ << " result: " << result << " vendorCode: " << vendorCode;
  166. if (result == FINGERPRINT_ACQUIRED_GOOD) {
  167. setFingerDown(false);
  168. }
  169. }
  170. void cancel() {
  171. LOG(DEBUG) << __func__;
  172. }
  173. private:
  174. fingerprint_device_t* mDevice;
  175. android::base::unique_fd touch_fd_;
  176. android::base::unique_fd disp_fd_;
  177. uint32_t lastPressX, lastPressY;
  178. void setFingerDown(bool pressed) {
  179. int buf[MAX_BUF_SIZE] = {MI_DISP_PRIMARY, THP_FOD_DOWNUP_CTL, pressed ? 1 : 0};
  180. ioctl(touch_fd_.get(), TOUCH_IOC_SET_CUR_VALUE, &buf);
  181. }
  182. };
  183. static UdfpsHandler* create() {
  184. return new XiaomiSm8450UdfpsHander();
  185. }
  186. static void destroy(UdfpsHandler* handler) {
  187. delete handler;
  188. }
  189. extern "C" UdfpsHandlerFactory UDFPS_HANDLER_FACTORY = {
  190. .create = create,
  191. .destroy = destroy,
  192. };