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
30 struct stub_local_time_device {
31 struct local_time_hw_device device;
32 };
33
ltdev_get_local_time(struct local_time_hw_device * dev)34 static 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
ltdev_get_local_freq(struct local_time_hw_device * dev)53 static 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
ltdev_close(hw_device_t * device)60 static int ltdev_close(hw_device_t *device)
61 {
62 free(device);
63 return 0;
64 }
65
ltdev_open(const hw_module_t * module,const char * name,hw_device_t ** device)66 static 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
95 static struct hw_module_methods_t hal_module_methods = {
96 .open = ltdev_open,
97 };
98
99 struct 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