Initial unified Samsung power HAL
This is a power HAL for non-qcom Samsung devices.
It currently supports standard multi-core systems as well as
big.LITTLE configurations.
This HAL auto-detects your touchscreen and touchkey input switches
and handles the interactive state requests.
I also implemented a check to make sure your touchkeys won't turn
on when they're not supposed to (for example when a CMHW class disables
the capacitive buttons and activates a software navigation solution).
This previously needed a kernel hack to make sure the touchkeys wouldn't
be activated when resuming from suspend.
Change-Id: I22888c5ac490c85c417c5457ea4f457f78ed3521
diff --git a/Android.mk b/Android.mk
index 42c9576..366ae0a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -37,5 +37,6 @@
ifeq ($(BOARD_VENDOR),samsung)
include $(SAM_ROOT)/modemloader/Android.mk
+include $(SAM_ROOT)/power/Android.mk
include $(SAM_ROOT)/ril/Android.mk
endif
diff --git a/power/Android.mk b/power/Android.mk
new file mode 100644
index 0000000..2aaaac8
--- /dev/null
+++ b/power/Android.mk
@@ -0,0 +1,29 @@
+# Copyright (C) 2015 The CyanogenMod 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 := $(call my-dir)
+
+ifeq ($(TARGET_POWERHAL_VARIANT),samsung)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := power.$(TARGET_BOOTLOADER_BOARD_NAME)
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_SRC_FILES := power.c
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif
diff --git a/power/power.c b/power/power.c
new file mode 100644
index 0000000..0b939b8
--- /dev/null
+++ b/power/power.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * Copyright (C) 2014 The CyanogenMod Project
+ * Copyright (C) 2014-2015 Andreas Schneider <asn@cryptomilk.org>
+ * Copyright (C) 2014-2015 Christopher N. Hesse <raymanfx@gmail.com>
+ *
+ * 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <malloc.h>
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define LOG_TAG "SamsungPowerHAL"
+/* #define LOG_NDEBUG 0 */
+#include <utils/Log.h>
+
+#include <hardware/hardware.h>
+#include <hardware/power.h>
+
+#define BOOSTPULSE_PATH "/sys/devices/system/cpu/cpu0/cpufreq/interactive/boostpulse"
+
+#define IO_IS_BUSY_PATH "/sys/devices/system/cpu/cpu0/cpufreq/interactive/io_is_busy"
+
+#define CPU0_HISPEED_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/interactive/hispeed_freq"
+#define CPU0_MAX_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
+#define CPU4_HISPEED_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/interactive/hispeed_freq"
+#define CPU4_MAX_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq"
+
+struct samsung_power_module {
+ struct power_module base;
+ pthread_mutex_t lock;
+ int boostpulse_fd;
+ int boostpulse_warned;
+ char cpu0_hispeed_freq[10];
+ char cpu0_max_freq[10];
+ char cpu4_hispeed_freq[10];
+ char cpu4_max_freq[10];
+ char* touchscreen_power_path;
+ char* touchkey_power_path;
+ bool touchkey_blocked;
+};
+
+/* POWER_HINT_LOW_POWER */
+static bool low_power_mode = false;
+
+/**********************************************************
+ *** HELPER FUNCTIONS
+ **********************************************************/
+
+static int sysfs_read(char *path, char *s, int num_bytes)
+{
+ char errno_str[64];
+ int len;
+ int ret = 0;
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error opening %s: %s\n", path, errno_str);
+
+ return -1;
+ }
+
+ len = read(fd, s, num_bytes - 1);
+ if (len < 0) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error reading from %s: %s\n", path, errno_str);
+
+ ret = -1;
+ } else {
+ s[len] = '\0';
+ }
+
+ close(fd);
+
+ return ret;
+}
+
+static void sysfs_write(const char *path, char *s)
+{
+ char errno_str[64];
+ int len;
+ int fd;
+
+ fd = open(path, O_WRONLY);
+ if (fd < 0) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error opening %s: %s\n", path, errno_str);
+ return;
+ }
+
+ len = write(fd, s, strlen(s));
+ if (len < 0) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error writing to %s: %s\n", path, errno_str);
+ }
+
+ close(fd);
+}
+
+/**********************************************************
+ *** POWER FUNCTIONS
+ **********************************************************/
+
+/* You need to request the powerhal lock before calling this function */
+static int boostpulse_open(struct samsung_power_module *samsung_pwr)
+{
+ char errno_str[64];
+
+ if (samsung_pwr->boostpulse_fd < 0) {
+ samsung_pwr->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY);
+ if (samsung_pwr->boostpulse_fd < 0) {
+ if (!samsung_pwr->boostpulse_warned) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, errno_str);
+ samsung_pwr->boostpulse_warned = 1;
+ }
+ }
+ }
+
+ return samsung_pwr->boostpulse_fd;
+}
+
+static void find_input_nodes(struct samsung_power_module *samsung_pwr, char *dir)
+{
+ const char filename[] = "name";
+ char errno_str[64];
+ struct dirent *de;
+ char file_content[20];
+ char *path = NULL;
+ char *node_path = NULL;
+ size_t pathsize;
+ size_t node_pathsize;
+ DIR *d;
+
+ d = opendir(dir);
+ if (d == NULL) {
+ return;
+ }
+
+ while ((de = readdir(d)) != NULL) {
+ if (strncmp(filename, de->d_name, sizeof(filename)) == 0) {
+ pathsize = strlen(dir) + strlen(de->d_name) + 2;
+ node_pathsize = strlen(dir) + strlen("enabled") + 2;
+
+ path = malloc(pathsize);
+ node_path = malloc(node_pathsize);
+ if (path == NULL || node_path == NULL) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Out of memory: %s\n", errno_str);
+ return;
+ }
+
+ snprintf(path, pathsize, "%s/%s", dir, filename);
+ sysfs_read(path, file_content, sizeof(file_content));
+
+ snprintf(node_path, node_pathsize, "%s/%s", dir, "enabled");
+
+ if (strncmp(file_content, "sec_touchkey", 12) == 0) {
+ ALOGV("%s: found touchkey path: %s\n", __func__, node_path);
+ samsung_pwr->touchkey_power_path = malloc(node_pathsize);
+ if (samsung_pwr->touchkey_power_path == NULL) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Out of memory: %s\n", errno_str);
+ return;
+ }
+ snprintf(samsung_pwr->touchkey_power_path, node_pathsize, node_path);
+ }
+
+ if (strncmp(file_content, "sec_touchscreen", 15) == 0) {
+ ALOGV("%s: found touchscreen path: %s\n", __func__, node_path);
+ samsung_pwr->touchscreen_power_path = malloc(node_pathsize);
+ if (samsung_pwr->touchscreen_power_path == NULL) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Out of memory: %s\n", errno_str);
+ return;
+ }
+ snprintf(samsung_pwr->touchscreen_power_path, node_pathsize, node_path);
+ }
+ }
+ }
+
+ if (path)
+ free(path);
+ if (node_path)
+ free(node_path);
+ closedir(d);
+}
+
+/**********************************************************
+ *** INIT FUNCTIONS
+ **********************************************************/
+
+static void init_cpufreqs(struct samsung_power_module *samsung_pwr)
+{
+ int rc;
+ struct stat sb;
+
+ sysfs_read(CPU0_HISPEED_FREQ_PATH, samsung_pwr->cpu0_hispeed_freq,
+ sizeof(samsung_pwr->cpu0_hispeed_freq));
+ sysfs_read(CPU0_MAX_FREQ_PATH, samsung_pwr->cpu0_max_freq,
+ sizeof(samsung_pwr->cpu0_max_freq));
+ ALOGV("%s: CPU 0 hispeed freq: %s\n", __func__, samsung_pwr->cpu0_hispeed_freq);
+ ALOGV("%s: CPU 0 max freq: %s\n", __func__, samsung_pwr->cpu0_max_freq);
+
+ rc = stat(CPU4_HISPEED_FREQ_PATH, &sb);
+ if (rc == 0) {
+ sysfs_read(CPU4_HISPEED_FREQ_PATH, samsung_pwr->cpu4_hispeed_freq,
+ sizeof(samsung_pwr->cpu4_hispeed_freq));
+ sysfs_read(CPU4_MAX_FREQ_PATH, samsung_pwr->cpu4_max_freq,
+ sizeof(samsung_pwr->cpu4_max_freq));
+ ALOGV("%s: CPU 4 hispeed freq: %s\n", __func__, samsung_pwr->cpu4_hispeed_freq);
+ ALOGV("%s: CPU 4 max freq: %s\n", __func__, samsung_pwr->cpu4_max_freq);
+ }
+}
+
+static void init_touch_input_power_path(struct samsung_power_module *samsung_pwr)
+{
+ char dir[1024];
+ char errno_str[64];
+ uint32_t i;
+
+ for (i = 0; i < 20; i++) {
+ snprintf(dir, sizeof(dir), "/sys/class/input/input%d", i);
+ find_input_nodes(samsung_pwr, dir);
+ }
+}
+
+/*
+ * The init function performs power management setup actions at runtime
+ * startup, such as to set default cpufreq parameters. This is called only by
+ * the Power HAL instance loaded by PowerManagerService.
+ */
+static void samsung_power_init(struct power_module *module)
+{
+ struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
+
+ init_cpufreqs(samsung_pwr);
+ init_touch_input_power_path(samsung_pwr);
+}
+
+/*
+ * The setInteractive function performs power management actions upon the
+ * system entering interactive state (that is, the system is awake and ready
+ * for interaction, often with UI devices such as display and touchscreen
+ * enabled) or non-interactive state (the system appears asleep, display
+ * usually turned off). The non-interactive state is usually entered after a
+ * period of inactivity, in order to conserve battery power during such
+ * inactive periods.
+ *
+ * Typical actions are to turn on or off devices and adjust cpufreq parameters.
+ * This function may also call the appropriate interfaces to allow the kernel
+ * to suspend the system to low-power sleep state when entering non-interactive
+ * state, and to disallow low-power suspend when the system is in interactive
+ * state. When low-power suspend state is allowed, the kernel may suspend the
+ * system whenever no wakelocks are held.
+ *
+ * on is non-zero when the system is transitioning to an interactive / awake
+ * state, and zero when transitioning to a non-interactive / asleep state.
+ *
+ * This function is called to enter non-interactive state after turning off the
+ * screen (if present), and called to enter interactive state prior to turning
+ * on the screen.
+ */
+static void samsung_power_set_interactive(struct power_module *module, int on)
+{
+ struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
+ struct stat sb;
+ char buf[80];
+ char touchkey_node[2];
+ int touchkey_enabled;
+ int rc;
+
+ ALOGV("power_set_interactive: %d\n", on);
+
+ sysfs_write(samsung_pwr->touchscreen_power_path, on ? "1" : "0");
+
+ rc = stat(samsung_pwr->touchkey_power_path, &sb);
+ if (rc < 0) {
+ goto out;
+ }
+
+ if (!on) {
+ if (sysfs_read(samsung_pwr->touchkey_power_path, touchkey_node,
+ sizeof(touchkey_node)) == 0) {
+ touchkey_enabled = touchkey_node[0] - '0';
+ /*
+ * If touchkey_enabled is 0, the keys have been disabled by another component
+ * (for example cmhw), which means we don't want them to be enabled when resuming
+ * from suspend.
+ */
+ if (touchkey_enabled == 0) {
+ samsung_pwr->touchkey_blocked = true;
+ } else {
+ samsung_pwr->touchkey_blocked = false;
+ sysfs_write(samsung_pwr->touchkey_power_path, "0");
+ }
+ }
+ } else if (!samsung_pwr->touchkey_blocked) {
+ sysfs_write(samsung_pwr->touchkey_power_path, "1");
+ }
+
+ sysfs_write(IO_IS_BUSY_PATH, on ? "1" : "0");
+
+out:
+ ALOGV("power_set_interactive: %d done\n", on);
+}
+
+/*
+ * The powerHint function is called to pass hints on power requirements, which
+ * may result in adjustment of power/performance parameters of the cpufreq
+ * governor and other controls.
+ *
+ * The possible hints are:
+ *
+ * POWER_HINT_VSYNC
+ *
+ * Foreground app has started or stopped requesting a VSYNC pulse
+ * from SurfaceFlinger. If the app has started requesting VSYNC
+ * then CPU and GPU load is expected soon, and it may be appropriate
+ * to raise speeds of CPU, memory bus, etc. The data parameter is
+ * non-zero to indicate VSYNC pulse is now requested, or zero for
+ * VSYNC pulse no longer requested.
+ *
+ * POWER_HINT_INTERACTION
+ *
+ * User is interacting with the device, for example, touchscreen
+ * events are incoming. CPU and GPU load may be expected soon,
+ * and it may be appropriate to raise speeds of CPU, memory bus,
+ * etc. The data parameter is unused.
+ *
+ * POWER_HINT_LOW_POWER
+ *
+ * Low power mode is activated or deactivated. Low power mode
+ * is intended to save battery at the cost of performance. The data
+ * parameter is non-zero when low power mode is activated, and zero
+ * when deactivated.
+ *
+ * POWER_HINT_CPU_BOOST
+ *
+ * An operation is happening where it would be ideal for the CPU to
+ * be boosted for a specific duration. The data parameter is an
+ * integer value of the boost duration in microseconds.
+ */
+static void samsung_power_hint(struct power_module *module,
+ power_hint_t hint,
+ void *data)
+{
+ struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
+ char errno_str[64];
+ int len;
+
+ switch (hint) {
+ case POWER_HINT_INTERACTION: {
+
+ ALOGV("%s: POWER_HINT_INTERACTION", __func__);
+
+ if (boostpulse_open(samsung_pwr) >= 0) {
+ len = write(samsung_pwr->boostpulse_fd, "1", 1);
+
+ if (len < 0) {
+ strerror_r(errno, errno_str, sizeof(errno_str));
+ ALOGE("Error writing to %s: %s\n", BOOSTPULSE_PATH, errno_str);
+ }
+ }
+
+ break;
+ }
+ case POWER_HINT_VSYNC: {
+
+ ALOGV("%s: POWER_HINT_VSYNC", __func__);
+
+ break;
+ }
+ case POWER_HINT_LOW_POWER: {
+ int rc;
+ struct stat sb;
+
+ ALOGV("%s: POWER_HINT_LOW_POWER", __func__);
+
+ pthread_mutex_lock(&samsung_pwr->lock);
+
+ /*
+ * TODO: We fail to restore the max freqs after low power mode has been
+ * disabled for some reason (big.LITTLE specific issue?)
+ *
+ if (data) {
+ sysfs_write(CPU0_MAX_FREQ_PATH, samsung_pwr->cpu0_hispeed_freq);
+ rc = stat(CPU4_MAX_FREQ_PATH, &sb);
+ if (rc == 0) {
+ sysfs_write(CPU4_MAX_FREQ_PATH, samsung_pwr->cpu4_hispeed_freq);
+ }
+ } else {
+ sysfs_write(CPU0_MAX_FREQ_PATH, samsung_pwr->cpu0_max_freq);
+ rc = stat(CPU4_MAX_FREQ_PATH, &sb);
+ if (rc == 0) {
+ sysfs_write(CPU4_MAX_FREQ_PATH, samsung_pwr->cpu4_max_freq);
+ }
+ }
+ */
+ low_power_mode = data;
+
+ pthread_mutex_unlock(&samsung_pwr->lock);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static struct hw_module_methods_t power_module_methods = {
+ .open = NULL,
+};
+
+struct samsung_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 = "Samsung Power HAL",
+ .author = "The CyanogenMod Project",
+ .methods = &power_module_methods,
+ },
+
+ .init = samsung_power_init,
+ .setInteractive = samsung_power_set_interactive,
+ .powerHint = samsung_power_hint,
+ },
+
+ .lock = PTHREAD_MUTEX_INITIALIZER,
+ .boostpulse_fd = -1,
+ .boostpulse_warned = 0,
+};