diff options
Diffstat (limited to 'power/power_piranha.c')
| -rw-r--r-- | power/power_piranha.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/power/power_piranha.c b/power/power_piranha.c new file mode 100644 index 0000000..0f0d7ef --- /dev/null +++ b/power/power_piranha.c @@ -0,0 +1,161 @@ +/* + * 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 "Piranha PowerHAL" +#include <utils/Log.h> + +#include <hardware/hardware.h> +#include <hardware/power.h> + +#define BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/interactive/boostpulse" + +struct piranha_power_module { + struct power_module base; + pthread_mutex_t lock; + int boostpulse_fd; + int boostpulse_warned; +}; + +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 piranha_power_init(struct power_module *module) +{ + /* + * cpufreq interactive governor: timer 20ms, min sample 60ms, + * hispeed 700MHz at load 50%. + */ + + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate", + "20000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time", + "60000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq", + "700000"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load", + "50"); + sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay", + "100000"); +} + +static int boostpulse_open(struct piranha_power_module *piranha) +{ + char buf[80]; + + pthread_mutex_lock(&piranha->lock); + + if (piranha->boostpulse_fd < 0) { + piranha->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY); + + if (piranha->boostpulse_fd < 0) { + if (!piranha->boostpulse_warned) { + strerror_r(errno, buf, sizeof(buf)); + ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, buf); + piranha->boostpulse_warned = 1; + } + } + } + + pthread_mutex_unlock(&piranha->lock); + return piranha->boostpulse_fd; +} + +static void piranha_power_set_interactive(struct power_module *module, int on) +{ + /* + * 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"); +} + +static void piranha_power_hint(struct power_module *module, power_hint_t hint, + void *data) +{ + struct piranha_power_module *piranha = (struct piranha_power_module *) module; + char buf[80]; + int len; + + switch (hint) { + case POWER_HINT_INTERACTION: + if (boostpulse_open(piranha) >= 0) { + len = write(piranha->boostpulse_fd, "1", 1); + + if (len < 0) { + strerror_r(errno, buf, sizeof(buf)); + ALOGE("Error writing to %s: %s\n", BOOSTPULSE_PATH, buf); + } + } + break; + + case POWER_HINT_VSYNC: + break; + + default: + break; + } +} + +static struct hw_module_methods_t power_module_methods = { + .open = NULL, +}; + +struct piranha_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: "Piranha Power HAL", + author: "The Android Open Source Project", + methods: &power_module_methods, + }, + + init: piranha_power_init, + setInteractive: piranha_power_set_interactive, + powerHint: piranha_power_hint, + }, + + lock: PTHREAD_MUTEX_INITIALIZER, + boostpulse_fd: -1, + boostpulse_warned: 0, +}; |