diff options
| -rw-r--r-- | include/hardware/local_time_hal.h | 117 | ||||
| -rw-r--r-- | modules/Android.mk | 2 | ||||
| -rw-r--r-- | modules/local_time/Android.mk | 34 | ||||
| -rw-r--r-- | modules/local_time/local_time_hw.c | 109 |
4 files changed, 261 insertions, 1 deletions
diff --git a/include/hardware/local_time_hal.h b/include/hardware/local_time_hal.h new file mode 100644 index 0000000..6b6a317 --- /dev/null +++ b/include/hardware/local_time_hal.h @@ -0,0 +1,117 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + + +#ifndef ANDROID_LOCAL_TIME_HAL_INTERFACE_H +#define ANDROID_LOCAL_TIME_HAL_INTERFACE_H + +#include <stdint.h> + +#include <hardware/hardware.h> + +__BEGIN_DECLS + +/** + * The id of this module + */ +#define LOCAL_TIME_HARDWARE_MODULE_ID "local_time" + +/** + * Name of the local time devices to open + */ +#define LOCAL_TIME_HARDWARE_INTERFACE "local_time_hw_if" + +/**********************************************************************/ + +/** + * A structure used to collect low level sync data in a lab environment. Most + * HAL implementations will never need this structure. + */ +struct local_time_debug_event { + int64_t local_timesync_event_id; + int64_t local_time; +}; + +/** + * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM + * and the fields of this data structure must begin with hw_module_t + * followed by module specific information. + */ +struct local_time_module { + struct hw_module_t common; +}; + +struct local_time_hw_device { + struct hw_device_t common; + + /** + * + * Returns the current value of the system wide local time counter + */ + int64_t (*get_local_time)(struct local_time_hw_device* dev); + + /** + * + * Returns the nominal frequency (in hertz) of the system wide local time + * counter + */ + uint64_t (*get_local_freq)(struct local_time_hw_device* dev); + + /** + * + * Sets the HW slew rate of oscillator which drives the system wide local + * time counter. On success, platforms should return 0. Platforms which + * do not support HW slew should leave this method set to NULL. + * + * Valid values for rate range from MIN_INT16 to MAX_INT16. Platform + * implementations should attempt map this range linearly to the min/max + * slew rate of their hardware. + */ + int (*set_local_slew)(struct local_time_hw_device* dev, int16_t rate); + + /** + * + * A method used to collect low level sync data in a lab environments. + * Most HAL implementations will simply set this member to NULL, or return + * -EINVAL to indicate that this functionality is not supported. + * Production HALs should never support this method. + */ + int (*get_debug_log)(struct local_time_hw_device* dev, + struct local_time_debug_event* records, + int max_records); +}; + +typedef struct local_time_hw_device local_time_hw_device_t; + +/** convenience API for opening and closing a supported device */ + +static inline int local_time_hw_device_open( + const struct hw_module_t* module, + struct local_time_hw_device** device) +{ + return module->methods->open(module, LOCAL_TIME_HARDWARE_INTERFACE, + (struct hw_device_t**)device); +} + +static inline int local_time_hw_device_close(struct local_time_hw_device* device) +{ + return device->common.close(&device->common); +} + + +__END_DECLS + +#endif // ANDROID_LOCAL_TIME_INTERFACE_H diff --git a/modules/Android.mk b/modules/Android.mk index 6231e78..c4c66da 100644 --- a/modules/Android.mk +++ b/modules/Android.mk @@ -1,2 +1,2 @@ -hardware_modules := gralloc hwcomposer audio nfc +hardware_modules := gralloc hwcomposer audio nfc local_time include $(call all-named-subdir-makefiles,$(hardware_modules)) diff --git a/modules/local_time/Android.mk b/modules/local_time/Android.mk new file mode 100644 index 0000000..f840dc7 --- /dev/null +++ b/modules/local_time/Android.mk @@ -0,0 +1,34 @@ +# Copyright (C) 2011 The Android Open Source Project +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +LOCAL_PATH := $(call my-dir) + +# The default local time HAL module. The default module simply uses the +# system's clock_gettime(CLOCK_MONOTONIC) and does not support HW slewing. +# Devices which use the default implementation should take care to ensure that +# the oscillator backing the CLOCK_MONOTONIC implementation is phase locked to +# the audio and video output hardware. This default implementation is loaded +# if no other device specific modules are present. The exact load order can be +# seen in libhardware/hardware.c +# +# The format of the name is local_time.<hardware>.so +include $(CLEAR_VARS) + +LOCAL_MODULE := local_time.default +LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw +LOCAL_SRC_FILES := local_time_hw.c +LOCAL_SHARED_LIBRARIES := liblog libcutils +LOCAL_MODULE_TAGS := optional + +include $(BUILD_SHARED_LIBRARY) diff --git a/modules/local_time/local_time_hw.c b/modules/local_time/local_time_hw.c new file mode 100644 index 0000000..a1f5d43 --- /dev/null +++ b/modules/local_time/local_time_hw.c @@ -0,0 +1,109 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define LOG_TAG "local_time_hw_default" +//#define LOG_NDEBUG 0 + +#include <errno.h> +#include <stdint.h> +#include <sys/time.h> +#include <linux/time.h> + +#include <cutils/log.h> + +#include <hardware/hardware.h> +#include <hardware/local_time_hal.h> + +struct stub_local_time_device { + struct local_time_hw_device device; +}; + +static int64_t ltdev_get_local_time(struct local_time_hw_device* dev) +{ + struct timespec ts; + uint64_t now; + int ret; + + ret = clock_gettime(CLOCK_MONOTONIC, &ts); + if (ret < 0) { + LOGW("%s failed to fetch CLOCK_MONOTONIC value! (res = %d)", + dev->common.module->name, ret); + return 0; + } + + now = (((uint64_t)ts.tv_sec) * 1000000000ull) + + ((uint64_t)ts.tv_nsec); + + return (int64_t)now; +} + +static uint64_t ltdev_get_local_freq(struct local_time_hw_device* dev) +{ + // For better or worse, linux clock_gettime routines normalize all clock + // frequencies to 1GHz + return 1000000000ull; +} + +static int ltdev_close(hw_device_t *device) +{ + free(device); + return 0; +} + +static int ltdev_open(const hw_module_t* module, const char* name, + hw_device_t** device) +{ + struct stub_local_time_device *ltdev; + struct timespec ts; + int ret; + + if (strcmp(name, LOCAL_TIME_HARDWARE_INTERFACE) != 0) + return -EINVAL; + + ltdev = calloc(1, sizeof(struct stub_local_time_device)); + if (!ltdev) + return -ENOMEM; + + ltdev->device.common.tag = HARDWARE_DEVICE_TAG; + ltdev->device.common.version = 0; + ltdev->device.common.module = (struct hw_module_t *) module; + ltdev->device.common.close = ltdev_close; + + ltdev->device.get_local_time = ltdev_get_local_time; + ltdev->device.get_local_freq = ltdev_get_local_freq; + ltdev->device.set_local_slew = NULL; + ltdev->device.get_debug_log = NULL; + + *device = <dev->device.common; + + return 0; +} + +static struct hw_module_methods_t hal_module_methods = { + .open = ltdev_open, +}; + +struct local_time_module HAL_MODULE_INFO_SYM = { + .common = { + .tag = HARDWARE_MODULE_TAG, + .version_major = 1, + .version_minor = 0, + .id = LOCAL_TIME_HARDWARE_MODULE_ID, + .name = "Default local_time HW HAL", + .author = "The Android Open Source Project", + .methods = &hal_module_methods, + }, +}; |