1 /* 2 * Copyright (C) 2008-2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SENSORS_H_ 18 19 #include <poll.h> 20 21 #include <hardware/hardware.h> 22 #include <hardware/sensors.h> 23 24 /* 25 * cros_ec_sensors_poll_context_t: 26 * 27 * Responsible for implementing the pool functions. 28 * We are currently polling on 2 files: 29 * - the IIO ring buffer (via CrosECSensor object) 30 * - a pipe to sleep on. a call to activate() will wake up 31 * the context poll() is running in. 32 * 33 * This code could accomodate more than one ring buffer. 34 * If we implement wake up/non wake up sensors, we would lister to 35 * iio buffer woken up by sysfs triggers. 36 */ 37 struct cros_ec_sensors_poll_context_t { 38 sensors_poll_device_1_t device; // must be first 39 40 cros_ec_sensors_poll_context_t( 41 const struct hw_module_t *module, 42 const char *ring_device_name, 43 const char *ring_trigger_name); 44 45 private: 46 enum { 47 crosEcRingFd = 0, 48 crosEcWakeFd, 49 numFds, 50 }; 51 52 static const char WAKE_MESSAGE = 'W'; 53 struct pollfd mPollFds[numFds]; 54 int mWritePipeFd; 55 CrosECSensor *mSensor; 56 57 ~cros_ec_sensors_poll_context_t(); 58 59 int activate(int handle, int enabled); 60 int setDelay(int handle, int64_t ns); 61 int pollEvents(sensors_event_t* data, int count); 62 int batch(int handle, int flags, int64_t period_ns, int64_t timeout); 63 int flush(int handle); 64 65 static int wrapper_close(struct hw_device_t *dev); 66 static int wrapper_activate(struct sensors_poll_device_t *dev, 67 int handle, int enabled); 68 static int wrapper_setDelay(struct sensors_poll_device_t *dev, 69 int handle, int64_t ns); 70 static int wrapper_poll(struct sensors_poll_device_t *dev, 71 sensors_event_t* data, int count); 72 static int wrapper_batch(struct sensors_poll_device_1 *dev, 73 int handle, int flags, int64_t period_ns, int64_t timeout); 74 static int wrapper_flush(struct sensors_poll_device_1 *dev, 75 int handle); 76 77 }; 78 79 80 81 #define SENSORS_H_ 82 #endif /* SENSORS_H_ */ 83
