UdfpsHandler.cpp 7.6 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 "UdfpsHandler.h"
  16. #include "xiaomi_touch.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 TOUCH_DEV_PATH "/dev/xiaomi-touch"
  28. #define TOUCH_MAGIC 'T'
  29. #define TOUCH_IOC_SET_CUR_VALUE _IO(TOUCH_MAGIC, SET_CUR_VALUE)
  30. #define TOUCH_IOC_GET_CUR_VALUE _IO(TOUCH_MAGIC, GET_CUR_VALUE)
  31. #define DISP_FEATURE_PATH "/dev/mi_display/disp_feature"
  32. #define FOD_PRESS_STATUS_PATH "/sys/class/touch/touch_dev/fod_press_status"
  33. namespace {
  34. static bool readBool(int fd) {
  35. char c;
  36. int rc;
  37. rc = lseek(fd, 0, SEEK_SET);
  38. if (rc) {
  39. LOG(ERROR) << "failed to seek fd, err: " << rc;
  40. return false;
  41. }
  42. rc = read(fd, &c, sizeof(char));
  43. if (rc != 1) {
  44. LOG(ERROR) << "failed to read bool from fd, err: " << rc;
  45. return false;
  46. }
  47. return c != '0';
  48. }
  49. static disp_event_resp* parseDispEvent(int fd) {
  50. disp_event header;
  51. ssize_t headerSize = read(fd, &header, sizeof(header));
  52. if (headerSize < sizeof(header)) {
  53. LOG(ERROR) << "unexpected display event header size: " << headerSize;
  54. return nullptr;
  55. }
  56. struct disp_event_resp* response =
  57. reinterpret_cast<struct disp_event_resp*>(malloc(header.length));
  58. response->base = header;
  59. int dataLength = response->base.length - sizeof(response->base);
  60. if (dataLength < 0) {
  61. LOG(ERROR) << "invalid data length: " << response->base.length;
  62. return nullptr;
  63. }
  64. ssize_t dataSize = read(fd, &response->data, dataLength);
  65. if (dataSize < dataLength) {
  66. LOG(ERROR) << "unexpected display event data size: " << dataSize;
  67. return nullptr;
  68. }
  69. return response;
  70. }
  71. } // anonymous namespace
  72. class XiaomiSm8450UdfpsHander : public UdfpsHandler {
  73. public:
  74. void init(fingerprint_device_t* device) {
  75. mDevice = device;
  76. touch_fd_ = android::base::unique_fd(open(TOUCH_DEV_PATH, O_RDWR));
  77. disp_fd_ = android::base::unique_fd(open(DISP_FEATURE_PATH, O_RDWR));
  78. std::string fpVendor = android::base::GetProperty("persist.vendor.sys.fp.vendor", "none");
  79. LOG(DEBUG) << __func__ << "fingerprint vendor is: " << fpVendor;
  80. isFpcFod = fpVendor == "fpc_fod";
  81. // Thread to notify fingeprint hwmodule about fod presses
  82. std::thread([this]() {
  83. int fd = open(FOD_PRESS_STATUS_PATH, O_RDONLY);
  84. if (fd < 0) {
  85. LOG(ERROR) << "failed to open " << FOD_PRESS_STATUS_PATH << " , err: " << fd;
  86. return;
  87. }
  88. struct pollfd fodPressStatusPoll = {
  89. .fd = fd,
  90. .events = POLLERR | POLLPRI,
  91. .revents = 0,
  92. };
  93. while (true) {
  94. int rc = poll(&fodPressStatusPoll, 1, -1);
  95. if (rc < 0) {
  96. LOG(ERROR) << "failed to poll " << FOD_PRESS_STATUS_PATH << ", err: " << rc;
  97. continue;
  98. }
  99. bool pressed = readBool(fd);
  100. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_X, pressed ? lastPressX : 0);
  101. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_Y, pressed ? lastPressY : 0);
  102. mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_STATUS,
  103. pressed ? PARAM_FOD_PRESSED : PARAM_FOD_RELEASED);
  104. // Request HBM
  105. disp_local_hbm_req req;
  106. req.base.flag = 0;
  107. req.base.disp_id = MI_DISP_PRIMARY;
  108. req.local_hbm_value = pressed ? LHBM_TARGET_BRIGHTNESS_WHITE_1000NIT
  109. : LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
  110. ioctl(disp_fd_.get(), MI_DISP_IOCTL_SET_LOCAL_HBM, &req);
  111. }
  112. }).detach();
  113. // Thread to listen for fod ui changes
  114. std::thread([this]() {
  115. int fd = open(DISP_FEATURE_PATH, O_RDWR);
  116. if (fd < 0) {
  117. LOG(ERROR) << "failed to open " << DISP_FEATURE_PATH << " , err: " << fd;
  118. return;
  119. }
  120. // Register for FOD events
  121. disp_event_req req;
  122. req.base.flag = 0;
  123. req.base.disp_id = MI_DISP_PRIMARY;
  124. req.type = MI_DISP_EVENT_FOD;
  125. ioctl(fd, MI_DISP_IOCTL_REGISTER_EVENT, &req);
  126. struct pollfd dispEventPoll = {
  127. .fd = fd,
  128. .events = POLLIN,
  129. .revents = 0,
  130. };
  131. while (true) {
  132. int rc = poll(&dispEventPoll, 1, -1);
  133. if (rc < 0) {
  134. LOG(ERROR) << "failed to poll " << DISP_FEATURE_PATH << ", err: " << rc;
  135. continue;
  136. }
  137. struct disp_event_resp* response = parseDispEvent(fd);
  138. if (response == nullptr) {
  139. continue;
  140. }
  141. if (response->base.type != MI_DISP_EVENT_FOD) {
  142. LOG(ERROR) << "unexpected display event: " << response->base.type;
  143. continue;
  144. }
  145. int value = response->data[0];
  146. LOG(DEBUG) << "received data: " << std::bitset<8>(value);
  147. bool localHbmUiReady = value & LOCAL_HBM_UI_READY;
  148. bool requestLowBrightnessCapture = value & FOD_LOW_BRIGHTNESS_CAPTURE;
  149. mDevice->extCmd(mDevice, COMMAND_NIT,
  150. localHbmUiReady
  151. ? (requestLowBrightnessCapture ? TARGET_BRIGHTNESS_110NIT
  152. : TARGET_BRIGHTNESS_1000NIT)
  153. : TARGET_BRIGHTNESS_OFF);
  154. }
  155. }).detach();
  156. }
  157. void onFingerDown(uint32_t x, uint32_t y, float /*minor*/, float /*major*/) {
  158. LOG(DEBUG) << __func__ << "x: " << x << ", y: " << y;
  159. // Track x and y coordinates
  160. lastPressX = x;
  161. lastPressY = y;
  162. // Notify touchscreen about press status
  163. setFingerDown(true);
  164. }
  165. void onFingerUp() {
  166. LOG(DEBUG) << __func__;
  167. // Notify touchscreen about press status
  168. setFingerDown(false);
  169. }
  170. void onAcquired(int32_t result, int32_t vendorCode) {
  171. LOG(DEBUG) << __func__ << " result: " << result << " vendorCode: " << vendorCode;
  172. if (result == FINGERPRINT_ACQUIRED_GOOD) {
  173. setFingerDown(false);
  174. }
  175. }
  176. void cancel() {
  177. LOG(DEBUG) << __func__;
  178. }
  179. private:
  180. fingerprint_device_t* mDevice;
  181. android::base::unique_fd touch_fd_;
  182. android::base::unique_fd disp_fd_;
  183. bool isFpcFod;
  184. uint32_t lastPressX, lastPressY;
  185. void setFingerDown(bool pressed) {
  186. int buf[MAX_BUF_SIZE] = {MI_DISP_PRIMARY, THP_FOD_DOWNUP_CTL, pressed ? 1 : 0};
  187. ioctl(touch_fd_.get(), TOUCH_IOC_SET_CUR_VALUE, &buf);
  188. }
  189. };
  190. static UdfpsHandler* create() {
  191. return new XiaomiSm8450UdfpsHander();
  192. }
  193. static void destroy(UdfpsHandler* handler) {
  194. delete handler;
  195. }
  196. extern "C" UdfpsHandlerFactory UDFPS_HANDLER_FACTORY = {
  197. .create = create,
  198. .destroy = destroy,
  199. };