power/power_hikey.c - device/linaro/hikey - Git at Google

 /*
  * Copyright (C) 2013 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.
  *
  * Based on the FlounderPowerHAL
  */

 #include <dirent.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdbool.h>
 #include <pthread.h>
 #include <semaphore.h>
 #include <cutils/properties.h>
 //#define LOG_NDEBUG 0

 #define LOG_TAG "HiKeyPowerHAL"
 #include <utils/Log.h>

 #include <hardware/hardware.h>
 #include <hardware/power.h>

 #define SCHEDTUNE_BOOST_PATH "/dev/stune/top-app/schedtune.boost"
 #define SCHEDTUNE_BOOST_NORM "10"
 #define SCHEDTUNE_BOOST_INTERACTIVE "40"
 #define SCHEDTUNE_BOOST_TIME_NS 1000000000LL
 #define INTERACTIVE_BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
 #define INTERACTIVE_IO_IS_BUSY_PATH "/sys/devices/system/cpu/cpufreq/interactive/io_is_busy"
 #define CPU_MAX_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
 #define LOW_POWER_MAX_FREQ "729000"
 #define NORMAL_MAX_FREQ "1200000"
 #define SVELTE_PROP "ro.boot.svelte"
 #define SVELTE_MAX_FREQ_PROP "ro.config.svelte.max_cpu_freq"
 #define SVELTE_LOW_POWER_MAX_FREQ_PROP "ro.config.svelte.low_power_max_cpu_freq"

 struct hikey_power_module {
     struct power_module base;
     pthread_mutex_t lock;
     /* interactive gov boost values */
     int boostpulse_fd;
     int boostpulse_warned;
     /* EAS schedtune values */
     int schedtune_boost_fd;
     long long deboost_time;
     sem_t signal_lock;
 };

 static bool low_power_mode = false;

 static char *max_cpu_freq = NORMAL_MAX_FREQ;
 static char *low_power_max_cpu_freq = LOW_POWER_MAX_FREQ;


 #define container_of(addr, struct_name, field_name) \
     ((struct_name *)((char *)(addr) - offsetof(struct_name, field_name)))


 static int sysfs_write(const char *path, char *s)
 {
     char buf[80];
     int len;
     int fd = open(path, O_WRONLY);

     if (fd < 0) {
         strerror_r(errno, buf, sizeof(buf));
         ALOGE("Error opening %s: %s\n", path, buf);
         return fd;
     }

     len = write(fd, s, strlen(s));
     if (len < 0) {
         strerror_r(errno, buf, sizeof(buf));
         ALOGE("Error writing to %s: %s\n", path, buf);
     }

     close(fd);
     return len;
 }

 #define NSEC_PER_SEC 1000000000LL
 static long long gettime_ns(void)
 {
     struct timespec ts;

     clock_gettime(CLOCK_MONOTONIC, &ts);
     return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
 }

 static void nanosleep_ns(long long ns)
 {
     struct timespec ts;
     ts.tv_sec = ns/NSEC_PER_SEC;
     ts.tv_nsec = ns%NSEC_PER_SEC;
     nanosleep(&ts, NULL);
 }

 /*[interactive cpufreq gov funcs]*********************************************/
 static void interactive_power_init(struct hikey_power_module __unused *hikey)
 {
     int32_t is_svelte = property_get_int32(SVELTE_PROP, 0);

     if (sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
                 "20000") < 0)
         return;
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_slack",
                 "20000");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time",
                 "80000");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq",
                 "1200000");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load",
                 "99");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/target_loads",
                 "65 729000:75 960000:85");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay",
                 "20000");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration",
                 "1000000");
     sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/io_is_busy", "0");

     if (is_svelte) {
         char prop_buffer[PROPERTY_VALUE_MAX];
         int len = property_get(SVELTE_MAX_FREQ_PROP, prop_buffer,
                                LOW_POWER_MAX_FREQ);

         max_cpu_freq = strndup(prop_buffer, len);
         len = property_get(SVELTE_LOW_POWER_MAX_FREQ_PROP, prop_buffer,
                            LOW_POWER_MAX_FREQ);
         low_power_max_cpu_freq = strndup(prop_buffer, len);
     }
 }

 static void power_set_interactive(struct power_module __unused *module, int on)
 {
     ALOGV("power_set_interactive: %d\n", on);

     /*
      * Lower maximum frequency when screen is off.
      */
     sysfs_write(CPU_MAX_FREQ_PATH,
                 (!on || low_power_mode) ? low_power_max_cpu_freq : max_cpu_freq);
     sysfs_write(INTERACTIVE_IO_IS_BUSY_PATH, on ? "1" : "0");
     ALOGV("power_set_interactive: %d done\n", on);
 }

 static int interactive_boostpulse(struct hikey_power_module *hikey)
 {
     char buf[80];
     int len;

    if (hikey->boostpulse_fd < 0)
         hikey->boostpulse_fd = open(INTERACTIVE_BOOSTPULSE_PATH, O_WRONLY);

     if (hikey->boostpulse_fd < 0) {
         if (!hikey->boostpulse_warned) {
             strerror_r(errno, buf, sizeof(buf));
             ALOGE("Error opening %s: %s\n", INTERACTIVE_BOOSTPULSE_PATH,
                       buf);
             hikey->boostpulse_warned = 1;
         }
         return hikey->boostpulse_fd;
     }

     len = write(hikey->boostpulse_fd, "1", 1);
     if (len < 0) {
         strerror_r(errno, buf, sizeof(buf));
         ALOGE("Error writing to %s: %s\n",
                                  INTERACTIVE_BOOSTPULSE_PATH, buf);
         return -1;
     }
     return 0;
 }

 /*[schedtune functions]*******************************************************/

 int schedtune_sysfs_boost(struct hikey_power_module *hikey, char* booststr)
 {
     char buf[80];
     int len;

     if (hikey->schedtune_boost_fd < 0)
         return hikey->schedtune_boost_fd;

     len = write(hikey->schedtune_boost_fd, booststr, 2);
     if (len < 0) {
         strerror_r(errno, buf, sizeof(buf));
         ALOGE("Error writing to %s: %s\n", SCHEDTUNE_BOOST_PATH, buf);
     }
     return len;
 }

 static void* schedtune_deboost_thread(void* arg)
 {
     struct hikey_power_module *hikey = (struct hikey_power_module *)arg;

     while(1) {
         sem_wait(&hikey->signal_lock);
         while(1) {
             long long now, sleeptime = 0;

             pthread_mutex_lock(&hikey->lock);
             now = gettime_ns();
             if (hikey->deboost_time > now) {
                 sleeptime = hikey->deboost_time - now;
                 pthread_mutex_unlock(&hikey->lock);
                 nanosleep_ns(sleeptime);
                 continue;
             }

             schedtune_sysfs_boost(hikey, SCHEDTUNE_BOOST_NORM);
             hikey->deboost_time = 0;
             pthread_mutex_unlock(&hikey->lock);
             break;
         }
     }
     return NULL;
 }

 static int schedtune_boost(struct hikey_power_module *hikey)
 {
     long long now;

     if (hikey->schedtune_boost_fd < 0)
         return hikey->schedtune_boost_fd;

     now = gettime_ns();
     if (!hikey->deboost_time) {
         schedtune_sysfs_boost(hikey, SCHEDTUNE_BOOST_INTERACTIVE);
         sem_post(&hikey->signal_lock);
     }
     hikey->deboost_time = now + SCHEDTUNE_BOOST_TIME_NS;

     return 0;
 }

 static void schedtune_power_init(struct hikey_power_module *hikey)
 {
     char buf[50];
     pthread_t tid;


     hikey->deboost_time = 0;
     sem_init(&hikey->signal_lock, 0, 1);

     hikey->schedtune_boost_fd = open(SCHEDTUNE_BOOST_PATH, O_WRONLY);
     if (hikey->schedtune_boost_fd < 0) {
         strerror_r(errno, buf, sizeof(buf));
         ALOGE("Error opening %s: %s\n", SCHEDTUNE_BOOST_PATH, buf);
     }

     pthread_create(&tid, NULL, schedtune_deboost_thread, hikey);
 }

 /*[generic functions]*********************************************************/
 static void hikey_power_init(struct power_module __unused *module)
 {
     struct hikey_power_module *hikey = container_of(module,
                                               struct hikey_power_module, base);
     interactive_power_init(hikey);
     schedtune_power_init(hikey);
 }

 static void hikey_hint_interaction(struct hikey_power_module *mod)
 {
     /* Try interactive cpufreq boosting first */
     if(!interactive_boostpulse(mod))
         return;
     /* Then try EAS schedtune boosting */
     if(!schedtune_boost(mod))
         return;
 }

 static void hikey_power_hint(struct power_module *module, power_hint_t hint,
                                 void *data)
 {
     struct hikey_power_module *hikey = container_of(module,
                                               struct hikey_power_module, base);

     pthread_mutex_lock(&hikey->lock);
     switch (hint) {
      case POWER_HINT_INTERACTION:
         hikey_hint_interaction(hikey);
         break;

    case POWER_HINT_VSYNC:
         break;

     case POWER_HINT_LOW_POWER:
         if (data) {
             sysfs_write(CPU_MAX_FREQ_PATH, low_power_max_cpu_freq);
         } else {
             sysfs_write(CPU_MAX_FREQ_PATH, max_cpu_freq);
         }
         low_power_mode = data;
         break;

     default:
             break;
     }
     pthread_mutex_unlock(&hikey->lock);
 }

 static void set_feature(struct power_module *module, feature_t feature, int state)
 {
     struct hikey_power_module *hikey = container_of(module,
                                               struct hikey_power_module, base);
     switch (feature) {
     default:
         ALOGW("Error setting the feature %d and state %d, it doesn't exist\n",
               feature, state);
         break;
     }
 }

 static int power_open(const hw_module_t* __unused module, const char* name,
                     hw_device_t** device)
 {
     int retval = 0; /* 0 is ok; -1 is error */
     ALOGD("%s: enter; name=%s", __FUNCTION__, name);

     if (strcmp(name, POWER_HARDWARE_MODULE_ID) == 0) {
         power_module_t *dev = (power_module_t *)calloc(1,
                 sizeof(power_module_t));

         if (dev) {
             /* Common hw_device_t fields */
             dev->common.tag = HARDWARE_DEVICE_TAG;
             dev->common.module_api_version = POWER_MODULE_API_VERSION_0_5;
             dev->common.hal_api_version = HARDWARE_HAL_API_VERSION;

             dev->init = hikey_power_init;
             dev->powerHint = hikey_power_hint;
             dev->setInteractive = power_set_interactive;
             dev->setFeature = set_feature;

             *device = (hw_device_t*)dev;
         } else
             retval = -ENOMEM;
     } else {
         retval = -EINVAL;
     }

     ALOGD("%s: exit %d", __FUNCTION__, retval);
     return retval;
 }

 static struct hw_module_methods_t power_module_methods = {
     .open = power_open,
 };

 struct hikey_power_module HAL_MODULE_INFO_SYM = {
     .base = {
         .common = {
             .tag = HARDWARE_MODULE_TAG,
             .module_api_version = POWER_MODULE_API_VERSION_0_2,
             .hal_api_version = HARDWARE_HAL_API_VERSION,
             .id = POWER_HARDWARE_MODULE_ID,
             .name = "HiKey Power HAL",
             .author = "The Android Open Source Project",
             .methods = &power_module_methods,
         },

         .init = hikey_power_init,
         .setInteractive = power_set_interactive,
         .powerHint = hikey_power_hint,
         .setFeature = set_feature,
     },

     .lock = PTHREAD_MUTEX_INITIALIZER,
     .boostpulse_fd = -1,
     .boostpulse_warned = 0,
 };
	/*
	* Copyright (C) 2013 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.
	*
	* Based on the FlounderPowerHAL
	*/

	#include <dirent.h>
	#include <errno.h>
	#include <string.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <stdbool.h>
	#include <pthread.h>
	#include <semaphore.h>
	#include <cutils/properties.h>
	//#define LOG_NDEBUG 0

	#define LOG_TAG "HiKeyPowerHAL"
	#include <utils/Log.h>

	#include <hardware/hardware.h>
	#include <hardware/power.h>

	#define SCHEDTUNE_BOOST_PATH "/dev/stune/top-app/schedtune.boost"
	#define SCHEDTUNE_BOOST_NORM "10"
	#define SCHEDTUNE_BOOST_INTERACTIVE "40"
	#define SCHEDTUNE_BOOST_TIME_NS 1000000000LL
	#define INTERACTIVE_BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
	#define INTERACTIVE_IO_IS_BUSY_PATH "/sys/devices/system/cpu/cpufreq/interactive/io_is_busy"
	#define CPU_MAX_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
	#define LOW_POWER_MAX_FREQ "729000"
	#define NORMAL_MAX_FREQ "1200000"
	#define SVELTE_PROP "ro.boot.svelte"
	#define SVELTE_MAX_FREQ_PROP "ro.config.svelte.max_cpu_freq"
	#define SVELTE_LOW_POWER_MAX_FREQ_PROP "ro.config.svelte.low_power_max_cpu_freq"

	struct hikey_power_module {
	struct power_module base;
	pthread_mutex_t lock;
	/* interactive gov boost values */
	int boostpulse_fd;
	int boostpulse_warned;
	/* EAS schedtune values */
	int schedtune_boost_fd;
	long long deboost_time;
	sem_t signal_lock;
	};

	static bool low_power_mode = false;

	static char *max_cpu_freq = NORMAL_MAX_FREQ;
	static char *low_power_max_cpu_freq = LOW_POWER_MAX_FREQ;


	#define container_of(addr, struct_name, field_name) \
	((struct_name )((char )(addr) - offsetof(struct_name, field_name)))


	static int sysfs_write(const char path, char s)
	{
	char buf[80];
	int len;
	int fd = open(path, O_WRONLY);

	if (fd < 0) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error opening %s: %s\n", path, buf);
	return fd;
	}

	len = write(fd, s, strlen(s));
	if (len < 0) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error writing to %s: %s\n", path, buf);
	}

	close(fd);
	return len;
	}

	#define NSEC_PER_SEC 1000000000LL
	static long long gettime_ns(void)
	{
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC, &ts);
	return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
	}

	static void nanosleep_ns(long long ns)
	{
	struct timespec ts;
	ts.tv_sec = ns/NSEC_PER_SEC;
	ts.tv_nsec = ns%NSEC_PER_SEC;
	nanosleep(&ts, NULL);
	}

	/[interactive cpufreq gov funcs]********************************************/
	static void interactive_power_init(struct hikey_power_module __unused *hikey)
	{
	int32_t is_svelte = property_get_int32(SVELTE_PROP, 0);

	if (sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
	"20000") < 0)
	return;
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_slack",
	"20000");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time",
	"80000");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq",
	"1200000");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load",
	"99");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/target_loads",
	"65 729000:75 960000:85");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay",
	"20000");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration",
	"1000000");
	sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/io_is_busy", "0");

	if (is_svelte) {
	char prop_buffer[PROPERTY_VALUE_MAX];
	int len = property_get(SVELTE_MAX_FREQ_PROP, prop_buffer,
	LOW_POWER_MAX_FREQ);

	max_cpu_freq = strndup(prop_buffer, len);
	len = property_get(SVELTE_LOW_POWER_MAX_FREQ_PROP, prop_buffer,
	LOW_POWER_MAX_FREQ);
	low_power_max_cpu_freq = strndup(prop_buffer, len);
	}
	}

	static void power_set_interactive(struct power_module __unused *module, int on)
	{
	ALOGV("power_set_interactive: %d\n", on);

	/*
	* Lower maximum frequency when screen is off.
	*/
	sysfs_write(CPU_MAX_FREQ_PATH,
	(!on \|\| low_power_mode) ? low_power_max_cpu_freq : max_cpu_freq);
	sysfs_write(INTERACTIVE_IO_IS_BUSY_PATH, on ? "1" : "0");
	ALOGV("power_set_interactive: %d done\n", on);
	}

	static int interactive_boostpulse(struct hikey_power_module *hikey)
	{
	char buf[80];
	int len;

	if (hikey->boostpulse_fd < 0)
	hikey->boostpulse_fd = open(INTERACTIVE_BOOSTPULSE_PATH, O_WRONLY);

	if (hikey->boostpulse_fd < 0) {
	if (!hikey->boostpulse_warned) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error opening %s: %s\n", INTERACTIVE_BOOSTPULSE_PATH,
	buf);
	hikey->boostpulse_warned = 1;
	}
	return hikey->boostpulse_fd;
	}

	len = write(hikey->boostpulse_fd, "1", 1);
	if (len < 0) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error writing to %s: %s\n",
	INTERACTIVE_BOOSTPULSE_PATH, buf);
	return -1;
	}
	return 0;
	}

	/[schedtune functions]******************************************************/

	int schedtune_sysfs_boost(struct hikey_power_module hikey, char booststr)
	{
	char buf[80];
	int len;

	if (hikey->schedtune_boost_fd < 0)
	return hikey->schedtune_boost_fd;

	len = write(hikey->schedtune_boost_fd, booststr, 2);
	if (len < 0) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error writing to %s: %s\n", SCHEDTUNE_BOOST_PATH, buf);
	}
	return len;
	}

	static void* schedtune_deboost_thread(void* arg)
	{
	struct hikey_power_module hikey = (struct hikey_power_module )arg;

	while(1) {
	sem_wait(&hikey->signal_lock);
	while(1) {
	long long now, sleeptime = 0;

	pthread_mutex_lock(&hikey->lock);
	now = gettime_ns();
	if (hikey->deboost_time > now) {
	sleeptime = hikey->deboost_time - now;
	pthread_mutex_unlock(&hikey->lock);
	nanosleep_ns(sleeptime);
	continue;
	}

	schedtune_sysfs_boost(hikey, SCHEDTUNE_BOOST_NORM);
	hikey->deboost_time = 0;
	pthread_mutex_unlock(&hikey->lock);
	break;
	}
	}
	return NULL;
	}

	static int schedtune_boost(struct hikey_power_module *hikey)
	{
	long long now;

	if (hikey->schedtune_boost_fd < 0)
	return hikey->schedtune_boost_fd;

	now = gettime_ns();
	if (!hikey->deboost_time) {
	schedtune_sysfs_boost(hikey, SCHEDTUNE_BOOST_INTERACTIVE);
	sem_post(&hikey->signal_lock);
	}
	hikey->deboost_time = now + SCHEDTUNE_BOOST_TIME_NS;

	return 0;
	}

	static void schedtune_power_init(struct hikey_power_module *hikey)
	{
	char buf[50];
	pthread_t tid;


	hikey->deboost_time = 0;
	sem_init(&hikey->signal_lock, 0, 1);

	hikey->schedtune_boost_fd = open(SCHEDTUNE_BOOST_PATH, O_WRONLY);
	if (hikey->schedtune_boost_fd < 0) {
	strerror_r(errno, buf, sizeof(buf));
	ALOGE("Error opening %s: %s\n", SCHEDTUNE_BOOST_PATH, buf);
	}

	pthread_create(&tid, NULL, schedtune_deboost_thread, hikey);
	}

	/[generic functions]********************************************************/
	static void hikey_power_init(struct power_module __unused *module)
	{
	struct hikey_power_module *hikey = container_of(module,
	struct hikey_power_module, base);
	interactive_power_init(hikey);
	schedtune_power_init(hikey);
	}

	static void hikey_hint_interaction(struct hikey_power_module *mod)
	{
	/* Try interactive cpufreq boosting first */
	if(!interactive_boostpulse(mod))
	return;
	/* Then try EAS schedtune boosting */
	if(!schedtune_boost(mod))
	return;
	}

	static void hikey_power_hint(struct power_module *module, power_hint_t hint,
	void *data)
	{
	struct hikey_power_module *hikey = container_of(module,
	struct hikey_power_module, base);

	pthread_mutex_lock(&hikey->lock);
	switch (hint) {
	case POWER_HINT_INTERACTION:
	hikey_hint_interaction(hikey);
	break;

	case POWER_HINT_VSYNC:
	break;

	case POWER_HINT_LOW_POWER:
	if (data) {
	sysfs_write(CPU_MAX_FREQ_PATH, low_power_max_cpu_freq);
	} else {
	sysfs_write(CPU_MAX_FREQ_PATH, max_cpu_freq);
	}
	low_power_mode = data;
	break;

	default:
	break;
	}
	pthread_mutex_unlock(&hikey->lock);
	}

	static void set_feature(struct power_module *module, feature_t feature, int state)
	{
	struct hikey_power_module *hikey = container_of(module,
	struct hikey_power_module, base);
	switch (feature) {
	default:
	ALOGW("Error setting the feature %d and state %d, it doesn't exist\n",
	feature, state);
	break;
	}
	}

	static int power_open(const hw_module_t* __unused module, const char* name,
	hw_device_t** device)
	{
	int retval = 0; /* 0 is ok; -1 is error */
	ALOGD("%s: enter; name=%s", __FUNCTION__, name);

	if (strcmp(name, POWER_HARDWARE_MODULE_ID) == 0) {
	power_module_t dev = (power_module_t )calloc(1,
	sizeof(power_module_t));

	if (dev) {
	/* Common hw_device_t fields */
	dev->common.tag = HARDWARE_DEVICE_TAG;
	dev->common.module_api_version = POWER_MODULE_API_VERSION_0_5;
	dev->common.hal_api_version = HARDWARE_HAL_API_VERSION;

	dev->init = hikey_power_init;
	dev->powerHint = hikey_power_hint;
	dev->setInteractive = power_set_interactive;
	dev->setFeature = set_feature;

	device = (hw_device_t)dev;
	} else
	retval = -ENOMEM;
	} else {
	retval = -EINVAL;
	}

	ALOGD("%s: exit %d", __FUNCTION__, retval);
	return retval;
	}

	static struct hw_module_methods_t power_module_methods = {
	.open = power_open,
	};

	struct hikey_power_module HAL_MODULE_INFO_SYM = {
	.base = {
	.common = {
	.tag = HARDWARE_MODULE_TAG,
	.module_api_version = POWER_MODULE_API_VERSION_0_2,
	.hal_api_version = HARDWARE_HAL_API_VERSION,
	.id = POWER_HARDWARE_MODULE_ID,
	.name = "HiKey Power HAL",
	.author = "The Android Open Source Project",
	.methods = &power_module_methods,
	},

	.init = hikey_power_init,
	.setInteractive = power_set_interactive,
	.powerHint = hikey_power_hint,
	.setFeature = set_feature,
	},

	.lock = PTHREAD_MUTEX_INITIALIZER,
	.boostpulse_fd = -1,
	.boostpulse_warned = 0,
	};