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Initial unified Samsung power HAL

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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
tirimbino
Christopher N. Hesse 9 years ago
parent 40afadb663
commit de5e3c618d
3 changed files with 484 additions and 0 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 1
      Android.mk
  2. 29
      power/Android.mk
  3. 454
      power/power.c

1
Android.mk
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@ -37,5 +37,6 @@ endif
ifeq ($(BOARD_VENDOR),samsung)
include $(SAM_ROOT)/modemloader/Android.mk
include $(SAM_ROOT)/power/Android.mk
include $(SAM_ROOT)/ril/Android.mk
endif

29
power/Android.mk
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@ -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

454
power/power.c
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@ -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,
};
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