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#include <linux/fs.h>
#include <linux/cpufreq.h>
#if 0
extern void cpufreq_save_default_governor(void);
extern void cpufreq_restore_default_governor(void);
extern void cpufreq_set_conservative_governor(void);
extern void cpufreq_set_performance_governor(void);
extern void cpufreq_set_conservative_governor_param(int up_th, int down_th);
#endif
#define GOV_CHG_DBG 1
#define SET_CONSERVATIVE_GOVERNOR_UP_THRESHOLD 95
#define SET_CONSERVATIVE_GOVERNOR_DOWN_THRESHOLD 50
static char cpufreq_gov_default[32];
static char *sz_cpufreq_gov_performance = "performance";
static char *sz_cpufreq_gov_conservative = "conservative";
static char *cpufreq_sysfs_place_holder = "/sys/devices/system/cpu/cpu%i/cpufreq/scaling_governor";
static char *cpufreq_gov_conservative_param = "/sys/devices/system/cpu/cpufreq/conservative/%s";
static void cpufreq_set_governor(char *governor)
{
struct file *scaling_gov = NULL;
char buf[128];
int i;
loff_t offset = 0;
if (governor == NULL)
return;
for_each_online_cpu(i) {
sprintf(buf, cpufreq_sysfs_place_holder, i);
scaling_gov = filp_open(buf, O_RDWR, 0);
if (scaling_gov != NULL) {
if (scaling_gov->f_op != NULL &&
scaling_gov->f_op->write != NULL)
{
scaling_gov->f_op->write(scaling_gov,
governor,
strlen(governor),
&offset);
#ifdef GOV_CHG_DBG//[
printk("%s():set policy \"%s\"\n",__FUNCTION__,governor);
#endif //]GOV_CHG_DBG
}
else
pr_err("f_op might be null\n");
filp_close(scaling_gov, NULL);
} else {
pr_err("%s. Can't open %s\n", __func__, buf);
}
}
}
void cpufreq_save_default_governor(void)
{
int ret;
struct cpufreq_policy current_policy;
ret = cpufreq_get_policy(¤t_policy, 0);
if (ret < 0)
pr_err("%s: cpufreq_get_policy got error", __func__);
memcpy(cpufreq_gov_default, current_policy.governor->name, 32);
#ifdef GOV_CHG_DBG//[
printk("%s():save policy \"%s\"\n",__FUNCTION__,cpufreq_gov_default);
#endif //]GOV_CHG_DBG
}
void cpufreq_restore_default_governor(void)
{
cpufreq_set_governor(cpufreq_gov_default);
#ifdef GOV_CHG_DBG//[
printk("%s():restore policy \"%s\"\n",__FUNCTION__,cpufreq_gov_default);
#endif //]GOV_CHG_DBG
}
void cpufreq_set_conservative_governor_param(int up_th, int down_th)
{
struct file *gov_param = NULL;
static char buf[128], parm[8];
loff_t offset = 0;
if (up_th <= down_th) {
printk(KERN_ERR "%s: up_th(%d) is lesser than down_th(%d)\n",
__func__, up_th, down_th);
return;
}
sprintf(parm, "%d", up_th);
sprintf(buf, cpufreq_gov_conservative_param , "up_threshold");
gov_param = filp_open(buf, O_RDONLY, 0);
if (gov_param != NULL) {
if (gov_param->f_op != NULL &&
gov_param->f_op->write != NULL)
gov_param->f_op->write(gov_param,
parm,
strlen(parm),
&offset);
else
pr_err("f_op might be null\n");
filp_close(gov_param, NULL);
} else {
pr_err("%s. Can't open %s\n", __func__, buf);
}
sprintf(parm, "%d", down_th);
sprintf(buf, cpufreq_gov_conservative_param , "down_threshold");
gov_param = filp_open(buf, O_RDONLY, 0);
if (gov_param != NULL) {
if (gov_param->f_op != NULL &&
gov_param->f_op->write != NULL)
gov_param->f_op->write(gov_param,
parm,
strlen(parm),
&offset);
else
pr_err("f_op might be null\n");
filp_close(gov_param, NULL);
} else {
pr_err("%s. Can't open %s\n", __func__, buf);
}
}
void cpufreq_set_performance_governor(void)
{
cpufreq_set_governor(sz_cpufreq_gov_performance);
}
void cpufreq_set_conservative_governor(void)
{
cpufreq_set_governor(sz_cpufreq_gov_conservative);
}
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