1/* 2 * Copyright (C) 2011 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#define LOG_TAG "local_time_hw_default" 18//#define LOG_NDEBUG 0 19 20#include <errno.h> 21#include <stdint.h> 22#include <sys/time.h> 23#include <linux/time.h> 24 25#include <cutils/log.h> 26 27#include <hardware/hardware.h> 28#include <hardware/local_time_hal.h> 29 30struct stub_local_time_device { 31 struct local_time_hw_device device; 32}; 33 34static int64_t ltdev_get_local_time(struct local_time_hw_device* dev) 35{ 36 struct timespec ts; 37 uint64_t now; 38 int ret; 39 40 ret = clock_gettime(CLOCK_MONOTONIC, &ts); 41 if (ret < 0) { 42 ALOGW("%s failed to fetch CLOCK_MONOTONIC value! (res = %d)", 43 dev->common.module->name, ret); 44 return 0; 45 } 46 47 now = (((uint64_t)ts.tv_sec) * 1000000000ull) + 48 ((uint64_t)ts.tv_nsec); 49 50 return (int64_t)now; 51} 52 53static uint64_t ltdev_get_local_freq(struct local_time_hw_device* dev) 54{ 55 // For better or worse, linux clock_gettime routines normalize all clock 56 // frequencies to 1GHz 57 return 1000000000ull; 58} 59 60static int ltdev_close(hw_device_t *device) 61{ 62 free(device); 63 return 0; 64} 65 66static int ltdev_open(const hw_module_t* module, const char* name, 67 hw_device_t** device) 68{ 69 struct stub_local_time_device *ltdev; 70 struct timespec ts; 71 int ret; 72 73 if (strcmp(name, LOCAL_TIME_HARDWARE_INTERFACE) != 0) 74 return -EINVAL; 75 76 ltdev = calloc(1, sizeof(struct stub_local_time_device)); 77 if (!ltdev) 78 return -ENOMEM; 79 80 ltdev->device.common.tag = HARDWARE_DEVICE_TAG; 81 ltdev->device.common.version = 0; 82 ltdev->device.common.module = (struct hw_module_t *) module; 83 ltdev->device.common.close = ltdev_close; 84 85 ltdev->device.get_local_time = ltdev_get_local_time; 86 ltdev->device.get_local_freq = ltdev_get_local_freq; 87 ltdev->device.set_local_slew = NULL; 88 ltdev->device.get_debug_log = NULL; 89 90 *device = <dev->device.common; 91 92 return 0; 93} 94 95static struct hw_module_methods_t hal_module_methods = { 96 .open = ltdev_open, 97}; 98 99struct local_time_module HAL_MODULE_INFO_SYM = { 100 .common = { 101 .tag = HARDWARE_MODULE_TAG, 102 .version_major = 1, 103 .version_minor = 0, 104 .id = LOCAL_TIME_HARDWARE_MODULE_ID, 105 .name = "Default local_time HW HAL", 106 .author = "The Android Open Source Project", 107 .methods = &hal_module_methods, 108 }, 109}; 110