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power: stop slaughtering battery pls
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Daz Jones committed Apr 2, 2013
1 parent aea15db commit e19c56d
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Showing 2 changed files with 52 additions and 28 deletions.
64 changes: 41 additions & 23 deletions power/power.c
View file
Expand Up @@ -29,9 +29,10 @@
#define SCALING_GOVERNOR_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
#define BOOSTPULSE_ONDEMAND "/sys/devices/system/cpu/cpufreq/ondemand/boostpulse"
#define BOOSTPULSE_INTERACTIVE "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
#define SAMPLING_RATE_ONDEMAND "/sys/devices/system/cpu/cpufreq/ondemand/sampling_rate"
#define SAMPLING_RATE_SCREEN_ON "50000"
#define SAMPLING_RATE_SCREEN_OFF "500000"
#define TIMER_RATE_SCREEN_ON "30000"
#define TIMER_RATE_SCREEN_OFF "500000"

struct cm_power_module {
struct power_module base;
Expand All @@ -40,6 +41,8 @@ struct cm_power_module {
int boostpulse_warned;
};

static char governor[20];

static int sysfs_read(char *path, char *s, int num_bytes)
{
char buf[80];
Expand Down Expand Up @@ -89,10 +92,9 @@ static void sysfs_write(char *path, char *s)
close(fd);
}

static int get_scaling_governor(char governor[], int size) {
static int get_scaling_governor() {
if (sysfs_read(SCALING_GOVERNOR_PATH, governor,
size) == -1) {
// Can't obtain the scaling governor. Return.
sizeof(governor)) == -1) {
return -1;
} else {
// Strip newline at the end.
Expand All @@ -107,15 +109,42 @@ static int get_scaling_governor(char governor[], int size) {
return 0;
}

static void cm_power_set_interactive(struct power_module *module, int on)
{
if (strncmp(governor, "ondemand", 8) == 0)
sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/sampling_rate",
on ? SAMPLING_RATE_SCREEN_ON : SAMPLING_RATE_SCREEN_OFF);
else if (strncmp(governor, "interactive", 11) == 0)
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
on ? TIMER_RATE_SCREEN_ON : TIMER_RATE_SCREEN_OFF);
}


static void configure_governor()
{
cm_power_set_interactive(NULL, 1);

if (strncmp(governor, "ondemand", 8) == 0) {
sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/up_threshold", "90");
sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/io_is_busy", "1");
sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor", "4");
sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/down_differential", "10");

} else if (strncmp(governor, "interactive", 11) == 0) {
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time", "90000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq", "1134000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay", "30000");
}
}

static int boostpulse_open(struct cm_power_module *cm)
{
char buf[80];
char governor[80];

pthread_mutex_lock(&cm->lock);

if (cm->boostpulse_fd < 0) {
if (get_scaling_governor(governor, sizeof(governor)) < 0) {
if (get_scaling_governor() < 0) {
ALOGE("Can't read scaling governor.");
cm->boostpulse_warned = 1;
} else {
Expand All @@ -126,10 +155,12 @@ static int boostpulse_open(struct cm_power_module *cm)

if (cm->boostpulse_fd < 0 && !cm->boostpulse_warned) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening boostpulse: %s\n", buf);
ALOGV("Error opening boostpulse: %s\n", buf);
cm->boostpulse_warned = 1;
} else if (cm->boostpulse_fd > 0)
} else if (cm->boostpulse_fd > 0) {
configure_governor();
ALOGD("Opened %s boostpulse interface", governor);
}
}
}

Expand Down Expand Up @@ -176,23 +207,10 @@ static void cm_power_hint(struct power_module *module, power_hint_t hint,
}
}

static void cm_power_set_interactive(struct power_module *module, int on)
{
char governor[80];
if (strncmp(governor, "ondemand", 8) == 0)
sysfs_write(SAMPLING_RATE_ONDEMAND,
on ? SAMPLING_RATE_SCREEN_ON : SAMPLING_RATE_SCREEN_OFF);
else
ALOGV("Skipping sysfs_write to sampling_rate -- NOT using ondemand");
}

static void cm_power_init(struct power_module *module)
{
char governor[80];
if (strncmp(governor, "ondemand", 8) == 0)
sysfs_write(SAMPLING_RATE_ONDEMAND, SAMPLING_RATE_SCREEN_ON);
else
ALOGV("Skipping sysfs_write to sampling_rate -- NOT using ondemand");
get_scaling_governor();
configure_governor();
}

static struct hw_module_methods_t power_module_methods = {
Expand Down
16 changes: 11 additions & 5 deletions ramdisk/init.huawei.rc
View file
Expand Up @@ -114,13 +114,19 @@ on boot

chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
chown system system /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
chmod 0644 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
chmod 0644 /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
chmod 0666 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate

chown system system /sys/devices/system/cpu/cpufreq/ondemand/boostpulse
chown system system /sys/devices/system/cpu/cpufreq/interactive/boostpulse
chmod 0644 /sys/devices/system/cpu/cpufreq/ondemand/boostpulse
chmod 0644 /sys/devices/system/cpu/cpufreq/interactive/boostpulse
chown system system /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
chown system system /sys/devices/system/cpu/cpufreq/ondemand/io_is_busy
chown system system /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
chown system system /sys/devices/system/cpu/cpufreq/ondemand/down_differential
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/boostpulse
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/io_is_busy
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
chmod 0666 /sys/devices/system/cpu/cpufreq/ondemand/down_differential

on fs
# mount mmc partitions
Expand Down

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