diff options
Diffstat (limited to 'power')
| -rw-r--r-- | power/Android.mk | 27 | ||||
| -rw-r--r-- | power/power_tuna.c | 122 |
2 files changed, 149 insertions, 0 deletions
diff --git a/power/Android.mk b/power/Android.mk new file mode 100644 index 0000000..da60418 --- /dev/null +++ b/power/Android.mk @@ -0,0 +1,27 @@ +# Copyright (C) 2012 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) + +# HAL module implemenation stored in +# hw/<POWERS_HARDWARE_MODULE_ID>.<ro.hardware>.so +include $(CLEAR_VARS) + +LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw +LOCAL_SHARED_LIBRARIES := liblog libcutils +LOCAL_SRC_FILES := power_tuna.c +LOCAL_MODULE := power.tuna +LOCAL_MODULE_TAGS := optional +include $(BUILD_SHARED_LIBRARY) diff --git a/power/power_tuna.c b/power/power_tuna.c new file mode 100644 index 0000000..b7d5ac2 --- /dev/null +++ b/power/power_tuna.c @@ -0,0 +1,122 @@ +/* + * Copyright (C) 2012 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. + */ +#include <errno.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#define LOG_TAG "Tuna PowerHAL" +#include <utils/Log.h> + +#include <hardware/hardware.h> +#include <hardware/power.h> + +/* + * Tuna uses the legacy interface for requesting early suspend and late resume. + */ + +#define LEGACY_SYS_POWER_STATE "/sys/power/state" + +static int sPowerStatefd; +static const char *pwr_states[] = { "mem", "on" }; + +static void sysfs_write(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; + } + + 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); +} + +static void tuna_power_init(struct power_module *module) +{ + char buf[80]; + + sPowerStatefd = open(LEGACY_SYS_POWER_STATE, O_RDWR); + + if (sPowerStatefd < 0) { + strerror_r(errno, buf, sizeof(buf)); + ALOGE("Error opening %s: %s\n", LEGACY_SYS_POWER_STATE, buf); + } + + /* + * cpufreq interactive governor: timer 20ms, min sample 100ms, + * hispeed 700MHz at load 40% + */ + + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate", + "20000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time", + "100000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq", + "700000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load", + "40"); +} + +static void tuna_power_set_interactive(struct power_module *module, int on) +{ + char buf[80]; + int len; + + /* + * Lower maximum frequency when screen is off. CPU 0 and 1 share a + * cpufreq policy. + */ + + sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", + on ? "1200000" : "700000"); + + len = write(sPowerStatefd, pwr_states[!!on], strlen(pwr_states[!!on])); + if (len < 0) { + strerror_r(errno, buf, sizeof(buf)); + ALOGE("Error writing to %s: %s\n", LEGACY_SYS_POWER_STATE, buf); + } +} + + +static struct hw_module_methods_t power_module_methods = { + .open = NULL, +}; + +struct power_module HAL_MODULE_INFO_SYM = { + .common = { + .tag = HARDWARE_MODULE_TAG, + .version_major = 1, + .version_minor = 0, + .id = POWER_HARDWARE_MODULE_ID, + .name = "Tuna Power HAL", + .author = "The Android Open Source Project", + .methods = &power_module_methods, + }, + + .init = tuna_power_init, + .setInteractive = tuna_power_set_interactive, +}; |