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android_hardware_samsung/power/power.c

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/*
* 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) 2014-2017 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 <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#define LOG_TAG "SamsungPowerHAL"
/* #define LOG_NDEBUG 0 */
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/power.h>
#include <liblights/samsung_lights_helper.h>
#include "samsung_power.h"
#define BOOST_PATH "/boost"
#define BOOSTPULSE_PATH "/boostpulse"
#define IO_IS_BUSY_PATH "/io_is_busy"
#define HISPEED_FREQ_PATH "/hispeed_freq"
#define MAX_FREQ_PATH "/cpufreq/scaling_max_freq"
#define CLUSTER_COUNT ARRAY_SIZE(CPU_SYSFS_PATHS)
#define PARAM_MAXLEN 10
#define ARRAY_SIZE(a) sizeof(a) / sizeof(a[0])
struct samsung_power_module {
struct power_module base;
pthread_mutex_t lock;
int boost_fd;
int boostpulse_fd;
char hispeed_freqs[CLUSTER_COUNT][PARAM_MAXLEN];
char max_freqs[CLUSTER_COUNT][PARAM_MAXLEN];
char* touchscreen_power_path;
char* touchkey_power_path;
};
enum power_profile_e {
PROFILE_POWER_SAVE = 0,
PROFILE_BALANCED,
PROFILE_HIGH_PERFORMANCE,
PROFILE_MAX
};
static enum power_profile_e current_power_profile = PROFILE_BALANCED;
/**********************************************************
*** 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", 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", path, errno_str);
ret = -1;
} else {
// do not store newlines, but terminate the string instead
if (s[len-1] == '\n') {
s[len-1] = '\0';
} 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", 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", path, errno_str);
}
close(fd);
}
static void cpu_sysfs_read(const char *param, char s[CLUSTER_COUNT][PARAM_MAXLEN])
{
char path[PATH_MAX];
for (unsigned int i = 0; i < ARRAY_SIZE(CPU_SYSFS_PATHS); i++) {
sprintf(path, "%s%s", CPU_SYSFS_PATHS[i], param);
sysfs_read(path, s[i], PARAM_MAXLEN);
}
}
static void cpu_sysfs_write(const char *param, char s[CLUSTER_COUNT][PARAM_MAXLEN])
{
char path[PATH_MAX];
for (unsigned int i = 0; i < ARRAY_SIZE(CPU_SYSFS_PATHS); i++) {
sprintf(path, "%s%s", CPU_SYSFS_PATHS[i], param);
sysfs_write(path, s[i]);
}
}
static void cpu_interactive_read(const char *param, char s[CLUSTER_COUNT][PARAM_MAXLEN])
{
char path[PATH_MAX];
for (unsigned int i = 0; i < ARRAY_SIZE(CPU_INTERACTIVE_PATHS); i++) {
sprintf(path, "%s%s", CPU_INTERACTIVE_PATHS[i], param);
sysfs_read(path, s[i], PARAM_MAXLEN);
}
}
static void cpu_interactive_write(const char *param, char s[CLUSTER_COUNT][PARAM_MAXLEN])
{
char path[PATH_MAX];
for (unsigned int i = 0; i < ARRAY_SIZE(CPU_INTERACTIVE_PATHS); i++) {
sprintf(path, "%s%s", CPU_INTERACTIVE_PATHS[i], param);
sysfs_write(path, s[i]);
}
}
static void send_boost(int boost_fd, int32_t duration_us)
{
int len;
if (boost_fd < 0) {
return;
}
len = write(boost_fd, "1", 1);
if (len < 0) {
ALOGE("Error writing to %s%s: %s", CPU_INTERACTIVE_PATHS[0], BOOST_PATH, strerror(errno));
return;
}
usleep(duration_us);
len = write(boost_fd, "0", 1);
}
static void send_boostpulse(int boostpulse_fd)
{
int len;
if (boostpulse_fd < 0) {
return;
}
len = write(boostpulse_fd, "1", 1);
if (len < 0) {
ALOGE("Error writing to %s%s: %s", CPU_INTERACTIVE_PATHS[0], BOOSTPULSE_PATH,
strerror(errno));
}
}
/**********************************************************
*** POWER FUNCTIONS
**********************************************************/
static void set_power_profile(struct samsung_power_module *samsung_pwr,
int profile)
{
int rc;
if (profile < 0 || profile >= PROFILE_MAX) {
return;
}
if (current_power_profile == profile) {
return;
}
ALOGV("%s: profile=%d", __func__, profile);
switch (profile) {
case PROFILE_POWER_SAVE:
// Grab value set by init.*.rc
cpu_interactive_read(HISPEED_FREQ_PATH, samsung_pwr->hispeed_freqs);
// Limit to hispeed freq
cpu_sysfs_write(MAX_FREQ_PATH, samsung_pwr->hispeed_freqs);
ALOGV("%s: set powersave mode", __func__);
break;
case PROFILE_BALANCED:
// Restore normal max freq
cpu_sysfs_write(MAX_FREQ_PATH, samsung_pwr->max_freqs);
ALOGV("%s: set balanced mode", __func__);
break;
case PROFILE_HIGH_PERFORMANCE:
// Restore normal max freq
cpu_sysfs_write(MAX_FREQ_PATH, samsung_pwr->max_freqs);
ALOGV("%s: set performance mode", __func__);
break;
default:
ALOGW("%s: Unknown power profile: %d", __func__, profile);
return;
}
current_power_profile = profile;
}
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", 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", __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", errno_str);
return;
}
snprintf(samsung_pwr->touchkey_power_path, node_pathsize,
"%s", node_path);
}
if (strncmp(file_content, "sec_touchscreen", 15) == 0) {
ALOGV("%s: found touchscreen path: %s", __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", errno_str);
return;
}
snprintf(samsung_pwr->touchscreen_power_path, node_pathsize,
"%s", 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)
{
cpu_interactive_read(HISPEED_FREQ_PATH, samsung_pwr->hispeed_freqs);
cpu_sysfs_read(MAX_FREQ_PATH, samsung_pwr->max_freqs);
}
static void init_touch_input_power_path(struct samsung_power_module *samsung_pwr)
{
char dir[1024];
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);
}
}
static void boost_open(struct samsung_power_module *samsung_pwr)
{
char path[PATH_MAX];
// the boost node is only valid for the LITTLE cluster
sprintf(path, "%s%s", CPU_INTERACTIVE_PATHS[0], BOOST_PATH);
samsung_pwr->boost_fd = open(path, O_WRONLY);
if (samsung_pwr->boost_fd < 0) {
ALOGE("Error opening %s: %s\n", path, strerror(errno));
}
}
static void boostpulse_open(struct samsung_power_module *samsung_pwr)
{
char path[PATH_MAX];
// the boostpulse node is only valid for the LITTLE cluster
sprintf(path, "%s%s", CPU_INTERACTIVE_PATHS[0], BOOSTPULSE_PATH);
samsung_pwr->boostpulse_fd = open(path, O_WRONLY);
if (samsung_pwr->boostpulse_fd < 0) {
ALOGE("Error opening %s: %s\n", path, strerror(errno));
}
}
static void samsung_power_init(struct power_module *module)
{
struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
init_cpufreqs(samsung_pwr);
// keep interactive boost fds opened
boost_open(samsung_pwr);
boostpulse_open(samsung_pwr);
samsung_pwr->touchscreen_power_path = NULL;
samsung_pwr->touchkey_power_path = NULL;
init_touch_input_power_path(samsung_pwr);
ALOGI("Initialized settings:");
char max_freqs[PATH_MAX];
sprintf(max_freqs, "max_freqs: cluster[0]: %s", samsung_pwr->max_freqs[0]);
for (unsigned int i = 1; i < CLUSTER_COUNT; i++) {
sprintf(max_freqs, "%s, %s[%d]: %s", max_freqs, "cluster", i, samsung_pwr->max_freqs[i]);
}
ALOGI("%s", max_freqs);
char hispeed_freqs[PATH_MAX];
sprintf(hispeed_freqs, "hispeed_freqs: cluster[0]: %s", samsung_pwr->hispeed_freqs[0]);
for (unsigned int i = 1; i < CLUSTER_COUNT; i++) {
sprintf(hispeed_freqs, "%s, %s[%d]: %s", hispeed_freqs, "cluster", i,
samsung_pwr->hispeed_freqs[i]);
}
ALOGI("%s", hispeed_freqs);
ALOGI("boostpulse_fd: %d", samsung_pwr->boostpulse_fd);
ALOGI("touchscreen_power_path: %s",
samsung_pwr->touchscreen_power_path ? samsung_pwr->touchscreen_power_path : "NULL");
ALOGI("touchkey_power_path: %s",
samsung_pwr->touchkey_power_path ? samsung_pwr->touchkey_power_path : "NULL");
}
/**********************************************************
*** API FUNCTIONS
***
*** Refer to power.h for documentation.
**********************************************************/
static void samsung_power_set_interactive(struct power_module *module, int on)
{
struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
int panel_brightness;
char button_state[2];
int rc;
static bool touchkeys_blocked = false;
char ON[CLUSTER_COUNT][PARAM_MAXLEN] = {"1", "1"};
char OFF[CLUSTER_COUNT][PARAM_MAXLEN] = {"0", "0"};
ALOGV("power_set_interactive: %d", on);
/*
* Do not disable any input devices if the screen is on but we are in a non-interactive
* state.
*/
if (!on) {
panel_brightness = get_cur_panel_brightness();
if (panel_brightness < 0) {
ALOGE("%s: Failed to read panel brightness", __func__);
} else if (panel_brightness > 0) {
ALOGV("%s: Moving to non-interactive state, but screen is still on,"
" not disabling input devices", __func__);
goto out;
}
}
/* Sanity check the touchscreen path */
if (samsung_pwr->touchscreen_power_path) {
sysfs_write(samsung_pwr->touchscreen_power_path, on ? "1" : "0");
}
/* Bail out if the device does not have touchkeys */
if (samsung_pwr->touchkey_power_path == NULL) {
goto out;
}
if (!on) {
rc = sysfs_read(samsung_pwr->touchkey_power_path, button_state, ARRAY_SIZE(button_state));
if (rc < 0) {
ALOGE("%s: Failed to read touchkey state", __func__);
goto out;
}
/*
* If button_state 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 (button_state[0] == '0') {
touchkeys_blocked = true;
} else {
touchkeys_blocked = false;
}
}
if (!touchkeys_blocked) {
sysfs_write(samsung_pwr->touchkey_power_path, on ? "1" : "0");
}
out:
cpu_interactive_write(IO_IS_BUSY_PATH, on ? ON : OFF);
ALOGV("power_set_interactive: %d done", on);
}
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;
/* Bail out if low-power mode is active */
if (current_power_profile == PROFILE_POWER_SAVE && hint != POWER_HINT_LOW_POWER
&& hint != POWER_HINT_SET_PROFILE && hint != POWER_HINT_DISABLE_TOUCH) {
ALOGV("%s: PROFILE_POWER_SAVE active, ignoring hint %d", __func__, hint);
return;
}
switch (hint) {
case POWER_HINT_VSYNC:
ALOGV("%s: POWER_HINT_VSYNC", __func__);
break;
case POWER_HINT_INTERACTION:
ALOGV("%s: POWER_HINT_INTERACTION", __func__);
send_boostpulse(samsung_pwr->boostpulse_fd);
break;
case POWER_HINT_LOW_POWER:
ALOGV("%s: POWER_HINT_LOW_POWER", __func__);
set_power_profile(samsung_pwr, data ? PROFILE_POWER_SAVE : PROFILE_BALANCED);
break;
case POWER_HINT_LAUNCH:
ALOGV("%s: POWER_HINT_LAUNCH", __func__);
send_boostpulse(samsung_pwr->boostpulse_fd);
break;
case POWER_HINT_CPU_BOOST:
ALOGV("%s: POWER_HINT_CPU_BOOST", __func__);
int32_t duration_us = *((int32_t *)data);
send_boost(samsung_pwr->boost_fd, duration_us);
break;
case POWER_HINT_SET_PROFILE:
ALOGV("%s: POWER_HINT_SET_PROFILE", __func__);
int profile = *((intptr_t *)data);
set_power_profile(samsung_pwr, profile);
break;
case POWER_HINT_DISABLE_TOUCH:
ALOGV("%s: POWER_HINT_DISABLE_TOUCH", __func__);
sysfs_write(samsung_pwr->touchscreen_power_path, data ? "0" : "1");
break;
default:
ALOGW("%s: Unknown power hint: %d", __func__, hint);
break;
}
}
static int samsung_get_feature(struct power_module *module __unused,
feature_t feature)
{
if (feature == POWER_FEATURE_SUPPORTED_PROFILES) {
return PROFILE_MAX;
}
return -1;
}
static void samsung_set_feature(struct power_module *module, feature_t feature, int state __unused)
{
struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
switch (feature) {
#ifdef TARGET_TAP_TO_WAKE_NODE
case POWER_FEATURE_DOUBLE_TAP_TO_WAKE:
ALOGV("%s: %s double tap to wake", __func__, state ? "enabling" : "disabling");
sysfs_write(TARGET_TAP_TO_WAKE_NODE, state > 0 ? "1" : "0");
break;
#endif
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 LineageOS Project",
.methods = &power_module_methods,
},
.init = samsung_power_init,
.setInteractive = samsung_power_set_interactive,
.powerHint = samsung_power_hint,
.getFeature = samsung_get_feature,
.setFeature = samsung_set_feature
},
.lock = PTHREAD_MUTEX_INITIALIZER,
.boostpulse_fd = -1,
};
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