first commit

1 files changed, 1578 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq_balance.c b/drivers/cpufreq/cpufreq_balance.c
new file mode 100644
index 000000000..26bded227
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_balance.c
@@ -0,0 +1,1578 @@
+/*
+ *  drivers/cpufreq/cpufreq_hotplug.c
+ *
+ *  Copyright (C)  2001 Russell King
+ *            (C)  2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ *                      Jun Nakajima <jun.nakajima@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/cpu.h>
+#include <linux/jiffies.h>
+#include <linux/kernel_stat.h>
+#include <linux/mutex.h>
+#include <linux/hrtimer.h>
+#include <linux/tick.h>
+#include <linux/ktime.h>
+#include <linux/sched.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/sched/rt.h>
+#include <linux/kthread.h>
+
+extern unsigned int get_normal_max_freq(void);
+extern unsigned int mt_dvfs_power_dispatch_safe(void);
+extern int mt_gpufreq_target(int idx);
+/*
+ * dbs is used in this file as a shortform for demandbased switching
+ * It helps to keep variable names smaller, simpler
+ */
+
+#define DEF_FREQUENCY_DOWN_DIFFERENTIAL     (10)
+#define DEF_FREQUENCY_OD_THRESHOLD          (98)
+#define DEF_FREQUENCY_UP_THRESHOLD          (80)
+#define DEF_SAMPLING_DOWN_FACTOR            (1)
+#define MAX_SAMPLING_DOWN_FACTOR            (100000)
+#define MICRO_FREQUENCY_DOWN_DIFFERENTIAL   (15)
+#define MIN_FREQUENCY_DOWN_DIFFERENTIAL     (5)
+#define MAX_FREQUENCY_DOWN_DIFFERENTIAL     (20)
+#define MICRO_FREQUENCY_UP_THRESHOLD        (85)
+#define MICRO_FREQUENCY_MIN_SAMPLE_RATE     (30000)
+#define MIN_FREQUENCY_UP_THRESHOLD          (21)
+#define MAX_FREQUENCY_UP_THRESHOLD          (100)
+
+#define DEF_CPU_DOWN_DIFFERENTIAL   (10)
+#define MICRO_CPU_DOWN_DIFFERENTIAL (10)
+#define MIN_CPU_DOWN_DIFFERENTIAL   (0)
+#define MAX_CPU_DOWN_DIFFERENTIAL   (30)
+
+#define DEF_CPU_UP_THRESHOLD        (90)
+#define MICRO_CPU_UP_THRESHOLD      (90)
+#define MIN_CPU_UP_THRESHOLD        (80)
+#define MAX_CPU_UP_THRESHOLD        (100)
+
+#define CPU_UP_AVG_TIMES            (10)
+#define CPU_DOWN_AVG_TIMES          (50)
+#define THERMAL_DISPATCH_AVG_TIMES  (30)
+
+#define DEF_CPU_PERSIST_COUNT   (10)
+
+//#define DEBUG_LOG
+#define INPUT_BOOST             (1)
+
+/*
+ * The polling frequency of this governor depends on the capability of
+ * the processor. Default polling frequency is 1000 times the transition
+ * latency of the processor. The governor will work on any processor with
+ * transition latency <= 10mS, using appropriate sampling
+ * rate.
+ * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
+ * this governor will not work.
+ * All times here are in uS.
+ */
+#define MIN_SAMPLING_RATE_RATIO			(2)
+
+static unsigned int min_sampling_rate;
+
+#define LATENCY_MULTIPLIER			(1000)
+#define MIN_LATENCY_MULTIPLIER			(100)
+#define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)
+
+static void do_dbs_timer(struct work_struct *work);
+static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+				unsigned int event);
+
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE
+static
+#endif
+struct cpufreq_governor cpufreq_gov_balance = {
+       .name                   = "hotplug",
+       .governor               = cpufreq_governor_dbs,
+       .max_transition_latency = TRANSITION_LATENCY_LIMIT,
+       .owner                  = THIS_MODULE,
+};
+
+#ifdef CONFIG_SMP
+
+static int g_next_hp_action = 0;
+
+static long g_cpu_up_sum_load = 0;
+static int g_cpu_up_count = 0;
+
+static long g_cpu_down_sum_load = 0;
+static int g_cpu_down_count = 0;
+static int g_max_cpu_persist_count = 0;
+static int g_thermal_count = 0;
+
+static void hp_work_handler(struct work_struct *work);
+static struct delayed_work hp_work;
+
+#if INPUT_BOOST
+static struct task_struct *freq_up_task;
+#endif
+
+#endif
+
+static int cpu_loading = 0;
+static int cpus_sum_load = 0;
+/* Sampling types */
+enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
+
+struct cpu_dbs_info_s {
+	cputime64_t prev_cpu_idle;
+	cputime64_t prev_cpu_iowait;
+	cputime64_t prev_cpu_wall;
+	cputime64_t prev_cpu_nice;
+	struct cpufreq_policy *cur_policy;
+	struct delayed_work work;
+	struct cpufreq_frequency_table *freq_table;
+	unsigned int freq_lo;
+	unsigned int freq_lo_jiffies;
+	unsigned int freq_hi_jiffies;
+	unsigned int rate_mult;
+	int cpu;
+	unsigned int sample_type:1;
+	/*
+	 * percpu mutex that serializes governor limit change with
+	 * do_dbs_timer invocation. We do not want do_dbs_timer to run
+	 * when user is changing the governor or limits.
+	 */
+	struct mutex timer_mutex;
+};
+static DEFINE_PER_CPU(struct cpu_dbs_info_s, hp_cpu_dbs_info);
+
+static unsigned int dbs_enable;	/* number of CPUs using this policy */
+static unsigned int dbs_ignore = 1;
+static unsigned int dbs_thermal_limited;
+static unsigned int dbs_thermal_limited_freq;
+
+/* dvfs thermal limit */
+void dbs_freq_thermal_limited(unsigned int limited, unsigned int freq)
+{
+	dbs_thermal_limited = limited;
+	dbs_thermal_limited_freq = freq;
+}
+EXPORT_SYMBOL(dbs_freq_thermal_limited);
+
+/*
+ * dbs_mutex protects dbs_enable in governor start/stop.
+ */
+static DEFINE_MUTEX(dbs_mutex);
+
+/*
+ * dbs_hotplug protects all hotplug related global variables
+ */
+static DEFINE_MUTEX(hp_mutex);
+
+DEFINE_MUTEX(bl_onoff_mutex);
+
+static struct dbs_tuners {
+    unsigned int sampling_rate;
+    unsigned int od_threshold;
+    unsigned int up_threshold;
+    unsigned int down_differential;
+    unsigned int ignore_nice;
+    unsigned int sampling_down_factor;
+    unsigned int powersave_bias;
+    unsigned int io_is_busy;
+    unsigned int cpu_up_threshold;
+    unsigned int cpu_down_differential;
+    unsigned int cpu_up_avg_times;
+    unsigned int cpu_down_avg_times;
+    unsigned int thermal_dispatch_avg_times;
+    unsigned int cpu_num_limit;
+    unsigned int cpu_num_base;
+    unsigned int is_cpu_hotplug_disable;
+#if INPUT_BOOST
+    unsigned int cpu_input_boost_enable;
+#endif
+} dbs_tuners_ins = {
+    .od_threshold = DEF_FREQUENCY_OD_THRESHOLD,
+    .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
+    .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
+    .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL,
+    .ignore_nice = 0,
+    .powersave_bias = 0,
+    .cpu_up_threshold = DEF_CPU_UP_THRESHOLD,
+    .cpu_down_differential = DEF_CPU_DOWN_DIFFERENTIAL,
+    .cpu_up_avg_times = CPU_UP_AVG_TIMES,
+    .cpu_down_avg_times = CPU_DOWN_AVG_TIMES,
+    .thermal_dispatch_avg_times = THERMAL_DISPATCH_AVG_TIMES,
+    .cpu_num_limit = 1,
+    .cpu_num_base = 1,
+    .is_cpu_hotplug_disable = 1,
+#if INPUT_BOOST
+    .cpu_input_boost_enable = 1,
+#endif
+};
+
+static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq);
+
+static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
+{
+	u64 idle_time;
+	u64 cur_wall_time;
+	u64 busy_time;
+
+	cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
+
+	busy_time  = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
+	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
+	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
+	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
+	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
+	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+
+	idle_time = cur_wall_time - busy_time;
+	if (wall)
+		*wall = jiffies_to_usecs(cur_wall_time);
+
+	return jiffies_to_usecs(idle_time);
+}
+
+/* static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) */
+/* { */
+/* 	u64 idle_time = get_cpu_idle_time_us(cpu, NULL); */
+
+/* 	if (idle_time == -1ULL) */
+/* 		return get_cpu_idle_time_jiffy(cpu, wall); */
+/* 	else */
+/* 		idle_time += get_cpu_iowait_time_us(cpu, wall); */
+
+/* 	return idle_time; */
+/* } */
+
+static inline cputime64_t get_cpu_iowait_time(unsigned int cpu, cputime64_t *wall)
+{
+	u64 iowait_time = get_cpu_iowait_time_us(cpu, wall);
+
+	if (iowait_time == -1ULL)
+		return 0;
+
+	return iowait_time;
+}
+
+void force_two_core(void)
+{
+    bool raise_freq = false;
+
+    mutex_lock(&hp_mutex);
+    g_cpu_down_count = 0;
+    g_cpu_down_sum_load = 0;
+    if (num_online_cpus() < dbs_tuners_ins.cpu_num_limit) {
+        raise_freq = true;
+        g_next_hp_action = 1;
+        schedule_delayed_work_on(0, &hp_work, 0);
+    }
+    mutex_unlock(&hp_mutex);
+
+    if (raise_freq == true) {
+	wake_up_process(freq_up_task);
+    }
+
+    mt_gpufreq_target(0);
+}
+
+/*
+ * Find right freq to be set now with powersave_bias on.
+ * Returns the freq_hi to be used right now and will set freq_hi_jiffies,
+ * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
+ */
+static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
+					  unsigned int freq_next,
+					  unsigned int relation)
+{
+	unsigned int freq_req, freq_reduc, freq_avg;
+	unsigned int freq_hi, freq_lo;
+	unsigned int index = 0;
+	unsigned int jiffies_total, jiffies_hi, jiffies_lo;
+	struct cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info,
+						   policy->cpu);
+
+	if (!dbs_info->freq_table) {
+		dbs_info->freq_lo = 0;
+		dbs_info->freq_lo_jiffies = 0;
+		return freq_next;
+	}
+
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
+			relation, &index);
+	freq_req = dbs_info->freq_table[index].frequency;
+	freq_reduc = freq_req * dbs_tuners_ins.powersave_bias / 1000;
+	freq_avg = freq_req - freq_reduc;
+
+	/* Find freq bounds for freq_avg in freq_table */
+	index = 0;
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+			CPUFREQ_RELATION_H, &index);
+	freq_lo = dbs_info->freq_table[index].frequency;
+	index = 0;
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+			CPUFREQ_RELATION_L, &index);
+	freq_hi = dbs_info->freq_table[index].frequency;
+
+	/* Find out how long we have to be in hi and lo freqs */
+	if (freq_hi == freq_lo) {
+		dbs_info->freq_lo = 0;
+		dbs_info->freq_lo_jiffies = 0;
+		return freq_lo;
+	}
+	jiffies_total = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+	jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
+	jiffies_hi += ((freq_hi - freq_lo) / 2);
+	jiffies_hi /= (freq_hi - freq_lo);
+	jiffies_lo = jiffies_total - jiffies_hi;
+	dbs_info->freq_lo = freq_lo;
+	dbs_info->freq_lo_jiffies = jiffies_lo;
+	dbs_info->freq_hi_jiffies = jiffies_hi;
+	return freq_hi;
+}
+
+static void hotplug_powersave_bias_init_cpu(int cpu)
+{
+	struct cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, cpu);
+	dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
+	dbs_info->freq_lo = 0;
+}
+
+static void hotplug_powersave_bias_init(void)
+{
+	int i;
+	for_each_online_cpu(i) {
+		hotplug_powersave_bias_init_cpu(i);
+	}
+}
+
+/************************** sysfs interface ************************/
+
+static ssize_t show_sampling_rate_min(struct kobject *kobj,
+				      struct attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", min_sampling_rate);
+}
+
+define_one_global_ro(sampling_rate_min);
+
+/* cpufreq_hotplug Governor Tunables */
+#define show_one(file_name, object)					\
+static ssize_t show_##file_name						\
+(struct kobject *kobj, struct attribute *attr, char *buf)              \
+{									\
+	return sprintf(buf, "%u\n", dbs_tuners_ins.object);		\
+}
+
+show_one(sampling_rate, sampling_rate);
+show_one(io_is_busy, io_is_busy);
+show_one(up_threshold, up_threshold);
+show_one(od_threshold, od_threshold);
+show_one(down_differential, down_differential);
+show_one(sampling_down_factor, sampling_down_factor);
+show_one(ignore_nice_load, ignore_nice);
+show_one(powersave_bias, powersave_bias);
+show_one(cpu_up_threshold, cpu_up_threshold);
+show_one(cpu_down_differential, cpu_down_differential);
+show_one(cpu_up_avg_times, cpu_up_avg_times);
+show_one(cpu_down_avg_times, cpu_down_avg_times);
+show_one(thermal_dispatch_avg_times, thermal_dispatch_avg_times);
+show_one(cpu_num_limit, cpu_num_limit);
+show_one(cpu_num_base, cpu_num_base);
+show_one(is_cpu_hotplug_disable, is_cpu_hotplug_disable);
+#if INPUT_BOOST
+show_one(cpu_input_boost_enable, cpu_input_boost_enable);
+#endif
+
+/**
+ * update_sampling_rate - update sampling rate effective immediately if needed.
+ * @new_rate: new sampling rate
+ *
+ * If new rate is smaller than the old, simply updaing
+ * dbs_tuners_int.sampling_rate might not be appropriate. For example,
+ * if the original sampling_rate was 1 second and the requested new sampling
+ * rate is 10 ms because the user needs immediate reaction from hotplug
+ * governor, but not sure if higher frequency will be required or not,
+ * then, the governor may change the sampling rate too late; up to 1 second
+ * later. Thus, if we are reducing the sampling rate, we need to make the
+ * new value effective immediately.
+ */
+static void update_sampling_rate(unsigned int new_rate)
+{
+	int cpu;
+
+	dbs_tuners_ins.sampling_rate = new_rate
+				     = max(new_rate, min_sampling_rate);
+
+	for_each_online_cpu(cpu) {
+		struct cpufreq_policy *policy;
+		struct cpu_dbs_info_s *dbs_info;
+		unsigned long next_sampling, appointed_at;
+
+		policy = cpufreq_cpu_get(cpu);
+		if (!policy)
+			continue;
+		dbs_info = &per_cpu(hp_cpu_dbs_info, policy->cpu);
+		cpufreq_cpu_put(policy);
+
+		mutex_lock(&dbs_info->timer_mutex);
+
+		if (!delayed_work_pending(&dbs_info->work)) {
+			mutex_unlock(&dbs_info->timer_mutex);
+			continue;
+		}
+
+		next_sampling  = jiffies + usecs_to_jiffies(new_rate);
+		appointed_at = dbs_info->work.timer.expires;
+
+
+		if (time_before(next_sampling, appointed_at)) {
+
+			mutex_unlock(&dbs_info->timer_mutex);
+			cancel_delayed_work_sync(&dbs_info->work);
+			mutex_lock(&dbs_info->timer_mutex);
+
+			schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work,
+						 usecs_to_jiffies(new_rate));
+
+		}
+		mutex_unlock(&dbs_info->timer_mutex);
+	}
+}
+
+void bl_enable_timer(int enable)
+{
+	static unsigned int sampling_rate_backup = 0;
+
+	if (enable && !sampling_rate_backup)
+		return;
+
+	if (enable)
+		update_sampling_rate(sampling_rate_backup);
+	else {
+		struct cpufreq_policy *policy;
+		struct cpu_dbs_info_s *dbs_info;
+		unsigned int new_rate = 30000 * 100;  // change to 3s
+
+		/* restore original sampling rate */
+		sampling_rate_backup = dbs_tuners_ins.sampling_rate;
+		update_sampling_rate(new_rate);
+
+		policy = cpufreq_cpu_get(0);
+		if (!policy)
+			return;
+        
+		dbs_info = &per_cpu(hp_cpu_dbs_info, 0);
+		cpufreq_cpu_put(policy);
+
+		mutex_lock(&dbs_info->timer_mutex);
+
+		if (!delayed_work_pending(&dbs_info->work)) {
+			mutex_unlock(&dbs_info->timer_mutex);
+			return;
+		}
+
+		mutex_unlock(&dbs_info->timer_mutex);
+        
+		cancel_delayed_work_sync(&dbs_info->work);
+
+		mutex_lock(&dbs_info->timer_mutex);
+
+		schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work,
+						 usecs_to_jiffies(new_rate));
+
+		mutex_unlock(&dbs_info->timer_mutex);
+	}
+}
+EXPORT_SYMBOL(bl_enable_timer);
+
+static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
+				   const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+	update_sampling_rate(input);
+	return count;
+}
+
+static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
+				   const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+	dbs_tuners_ins.io_is_busy = !!input;
+	return count;
+}
+
+static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
+				  const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
+			input < MIN_FREQUENCY_UP_THRESHOLD) {
+		return -EINVAL;
+	}
+	dbs_tuners_ins.up_threshold = input;
+	return count;
+}
+
+static ssize_t store_od_threshold(struct kobject *a, struct attribute *b,
+				  const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
+			input < MIN_FREQUENCY_UP_THRESHOLD) {
+		return -EINVAL;
+	}
+	dbs_tuners_ins.od_threshold = input;
+	return count;
+}
+
+static ssize_t store_down_differential(struct kobject *a, struct attribute *b,
+                const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_FREQUENCY_DOWN_DIFFERENTIAL ||
+			input < MIN_FREQUENCY_DOWN_DIFFERENTIAL) {
+		return -EINVAL;
+	}
+	dbs_tuners_ins.down_differential = input;
+	return count;
+}
+
+static ssize_t store_sampling_down_factor(struct kobject *a,
+			struct attribute *b, const char *buf, size_t count)
+{
+	unsigned int input, j;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
+		return -EINVAL;
+	dbs_tuners_ins.sampling_down_factor = input;
+
+	/* Reset down sampling multiplier in case it was active */
+	for_each_online_cpu(j) {
+		struct cpu_dbs_info_s *dbs_info;
+		dbs_info = &per_cpu(hp_cpu_dbs_info, j);
+		dbs_info->rate_mult = 1;
+	}
+	return count;
+}
+
+static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
+				      const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+
+	unsigned int j;
+
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+
+	if (input > 1)
+		input = 1;
+
+	if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */
+		return count;
+	}
+	dbs_tuners_ins.ignore_nice = input;
+
+	/* we need to re-evaluate prev_cpu_idle */
+	for_each_online_cpu(j) {
+		struct cpu_dbs_info_s *dbs_info;
+		dbs_info = &per_cpu(hp_cpu_dbs_info, j);
+		dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
+                                                            &dbs_info->prev_cpu_wall,
+                                                            dbs_tuners_ins.io_is_busy);
+		if (dbs_tuners_ins.ignore_nice)
+			dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+
+	}
+	return count;
+}
+
+static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1)
+		return -EINVAL;
+
+	if (input > 1000)
+		input = 1000;
+
+	dbs_tuners_ins.powersave_bias = input;
+	hotplug_powersave_bias_init();
+	return count;
+}
+
+static ssize_t store_cpu_up_threshold(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_UP_THRESHOLD ||
+		input < MIN_CPU_UP_THRESHOLD) {
+		return -EINVAL;
+	}
+	dbs_tuners_ins.cpu_up_threshold = input;
+	return count;
+}
+
+static ssize_t store_cpu_down_differential(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_DOWN_DIFFERENTIAL ||
+		input < MIN_CPU_DOWN_DIFFERENTIAL) {
+		return -EINVAL;
+	}
+	dbs_tuners_ins.cpu_down_differential = input;
+	return count;
+}
+
+static ssize_t store_cpu_up_avg_times(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.cpu_up_avg_times = input;
+	return count;
+}
+
+static ssize_t store_cpu_down_avg_times(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.cpu_down_avg_times = input;
+	return count;
+}
+
+static ssize_t store_thermal_dispatch_avg_times(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.thermal_dispatch_avg_times = input;
+	return count;
+}
+
+static ssize_t store_cpu_num_limit(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.cpu_num_limit = input;
+	return count;
+}
+
+static ssize_t store_cpu_num_base(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	bool raise_freq = false;
+	int ret;
+	struct cpufreq_policy *policy;
+
+	policy = cpufreq_cpu_get(0);
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.cpu_num_base = input;
+	mutex_lock(&hp_mutex);
+	if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) {
+		raise_freq = true;
+		g_next_hp_action = 1;
+		schedule_delayed_work_on(0, &hp_work, 0);
+	}
+	mutex_unlock(&hp_mutex);
+
+	if(raise_freq == true)
+		dbs_freq_increase(policy, policy->max);
+
+	return count;
+}
+
+static ssize_t store_is_cpu_hotplug_disable(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	dbs_tuners_ins.is_cpu_hotplug_disable = input;
+	return count;
+}
+
+#if INPUT_BOOST
+static ssize_t store_cpu_input_boost_enable(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > 1 ||
+		input < 0) {
+		return -EINVAL;
+	}
+
+	mutex_lock(&hp_mutex);
+	dbs_tuners_ins.cpu_input_boost_enable = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+#endif
+
+define_one_global_rw(sampling_rate);
+define_one_global_rw(io_is_busy);
+define_one_global_rw(up_threshold);
+define_one_global_rw(od_threshold);
+define_one_global_rw(down_differential);
+define_one_global_rw(sampling_down_factor);
+define_one_global_rw(ignore_nice_load);
+define_one_global_rw(powersave_bias);
+define_one_global_rw(cpu_up_threshold);
+define_one_global_rw(cpu_down_differential);
+define_one_global_rw(cpu_up_avg_times);
+define_one_global_rw(cpu_down_avg_times);
+define_one_global_rw(thermal_dispatch_avg_times);
+define_one_global_rw(cpu_num_limit);
+define_one_global_rw(cpu_num_base);
+define_one_global_rw(is_cpu_hotplug_disable);
+#if INPUT_BOOST
+define_one_global_rw(cpu_input_boost_enable);
+#endif
+
+static struct attribute *dbs_attributes[] = {
+    &sampling_rate_min.attr,
+    &sampling_rate.attr,
+    &up_threshold.attr,
+    &od_threshold.attr,
+    &down_differential.attr,
+    &sampling_down_factor.attr,
+    &ignore_nice_load.attr,
+    &powersave_bias.attr,
+    &io_is_busy.attr,
+    &cpu_up_threshold.attr,
+    &cpu_down_differential.attr,
+    &cpu_up_avg_times.attr,
+    &cpu_down_avg_times.attr,
+    &thermal_dispatch_avg_times.attr,
+    &cpu_num_limit.attr,
+    &cpu_num_base.attr,
+    &is_cpu_hotplug_disable.attr,
+#if INPUT_BOOST
+    &cpu_input_boost_enable.attr,
+#endif
+    NULL
+};
+
+static struct attribute_group dbs_attr_group = {
+	.attrs = dbs_attributes,
+	.name = "hotplug",
+};
+
+/************************** sysfs end ************************/
+
+static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
+{
+	if (dbs_tuners_ins.powersave_bias)
+		freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
+	else if (p->cur == p->max)
+	{
+		if (dbs_ignore == 0)
+			dbs_ignore = 1;
+		else
+			return;
+	}
+
+	__cpufreq_driver_target(p, freq, dbs_tuners_ins.powersave_bias ?
+			CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
+}
+
+int mt_cpufreq_cur_load(void)
+{
+    return cpu_loading;
+}
+EXPORT_SYMBOL(mt_cpufreq_cur_load);
+
+void hp_set_dynamic_cpu_hotplug_enable(int enable)
+{
+	mutex_lock(&hp_mutex);
+	dbs_tuners_ins.is_cpu_hotplug_disable = !enable;
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_set_dynamic_cpu_hotplug_enable);
+
+void hp_limited_cpu_num(int num)
+{
+	mutex_lock(&hp_mutex);
+	dbs_tuners_ins.cpu_num_limit = num;
+
+	if (num < num_online_cpus()) {
+		printk("%s: CPU off due to thermal protection! limit_num = %d < online = %d\n", 
+                    __func__, num, num_online_cpus());
+		g_next_hp_action = 0;
+		schedule_delayed_work_on(0, &hp_work, 0);
+		g_cpu_down_count = 0;
+		g_cpu_down_sum_load = 0;
+	}
+    
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_limited_cpu_num);
+void hp_based_cpu_num(int num)
+{
+	mutex_lock(&hp_mutex);
+	dbs_tuners_ins.cpu_num_base = num;
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_based_cpu_num);
+
+#ifdef CONFIG_SMP
+
+static void hp_work_handler(struct work_struct *work)
+{
+	if (mutex_trylock(&bl_onoff_mutex))
+	{
+		if (!dbs_tuners_ins.is_cpu_hotplug_disable)
+		{
+			int onlines_cpu_n = num_online_cpus();
+
+			if (g_next_hp_action) // turn on CPU
+			{
+				if (onlines_cpu_n < num_possible_cpus())
+				{
+					printk("hp_work_handler: cpu_up(%d) kick off\n", onlines_cpu_n);
+					cpu_up(onlines_cpu_n);
+					printk("hp_work_handler: cpu_up(%d) completion\n", onlines_cpu_n);
+
+					dbs_ignore = 0; // force trigger frequency scaling
+				}
+			}
+			else // turn off CPU
+			{
+				if (onlines_cpu_n > 1)
+				{
+					printk("hp_work_handler: cpu_down(%d) kick off\n", (onlines_cpu_n - 1));
+					cpu_down((onlines_cpu_n - 1));
+					printk("hp_work_handler: cpu_down(%d) completion\n", (onlines_cpu_n - 1));
+
+					dbs_ignore = 0; // force trigger frequency scaling
+				}
+			}
+		}
+		mutex_unlock(&bl_onoff_mutex);
+	}
+}
+
+#endif
+
+static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
+{
+	unsigned int max_load_freq;
+    bool raise_freq = false;
+
+	struct cpufreq_policy *policy;
+	unsigned int j;
+
+	this_dbs_info->freq_lo = 0;
+	policy = this_dbs_info->cur_policy;
+
+	/*
+	 * Every sampling_rate, we check, if current idle time is less
+	 * than 20% (default), then we try to increase frequency
+	 * Every sampling_rate, we look for a the lowest
+	 * frequency which can sustain the load while keeping idle time over
+	 * 30%. If such a frequency exist, we try to decrease to this frequency.
+	 *
+	 * Any frequency increase takes it to the maximum frequency.
+	 * Frequency reduction happens at minimum steps of
+	 * 5% (default) of current frequency
+	 */
+
+	/* Get Absolute Load - in terms of freq */
+	max_load_freq = 0;
+	cpus_sum_load = 0;
+
+	for_each_cpu(j, policy->cpus) {
+		struct cpu_dbs_info_s *j_dbs_info;
+		cputime64_t cur_wall_time, cur_idle_time, cur_iowait_time;
+		unsigned int idle_time, wall_time, iowait_time;
+		unsigned int load, load_freq;
+		int freq_avg;
+
+		j_dbs_info = &per_cpu(hp_cpu_dbs_info, j);
+
+		cur_idle_time = get_cpu_idle_time(j, &cur_wall_time,
+                                                  dbs_tuners_ins.io_is_busy);
+		cur_iowait_time = get_cpu_iowait_time(j, &cur_wall_time);
+
+		wall_time = (unsigned int)
+			(cur_wall_time - j_dbs_info->prev_cpu_wall);
+		j_dbs_info->prev_cpu_wall = cur_wall_time;
+
+		idle_time = (unsigned int)
+			(cur_idle_time - j_dbs_info->prev_cpu_idle);
+		j_dbs_info->prev_cpu_idle = cur_idle_time;
+
+		iowait_time = (unsigned int)
+			(cur_iowait_time - j_dbs_info->prev_cpu_iowait);
+		j_dbs_info->prev_cpu_iowait = cur_iowait_time;
+
+		if (dbs_tuners_ins.ignore_nice) {
+			u64 cur_nice;
+			unsigned long cur_nice_jiffies;
+
+			cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
+					 j_dbs_info->prev_cpu_nice;
+			/*
+			 * Assumption: nice time between sampling periods will
+			 * be less than 2^32 jiffies for 32 bit sys
+			 */
+			cur_nice_jiffies = (unsigned long)
+					cputime64_to_jiffies64(cur_nice);
+
+			j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+			idle_time += jiffies_to_usecs(cur_nice_jiffies);
+		}
+
+		/*
+		 * For the purpose of hotplug, waiting for disk IO is an
+		 * indication that you're performance critical, and not that
+		 * the system is actually idle. So subtract the iowait time
+		 * from the cpu idle time.
+		 */
+
+		if (dbs_tuners_ins.io_is_busy && idle_time >= iowait_time)
+			idle_time -= iowait_time;
+
+		if (unlikely(!wall_time || wall_time < idle_time))
+			continue;
+
+		load = 100 * (wall_time - idle_time) / wall_time;
+
+		cpus_sum_load += load;
+
+		freq_avg = __cpufreq_driver_getavg(policy, j);
+		if (freq_avg <= 0)
+			freq_avg = policy->cur;
+
+		load_freq = load * freq_avg;
+		if (load_freq > max_load_freq)
+			max_load_freq = load_freq;
+
+		#ifdef DEBUG_LOG
+		printk("dbs_check_cpu: cpu = %d\n", j);
+		printk("dbs_check_cpu: wall_time = %d, idle_time = %d, load = %d\n", wall_time, idle_time, load);
+		printk("dbs_check_cpu: freq_avg = %d, max_load_freq = %d, cpus_sum_load = %d\n", freq_avg, max_load_freq, cpus_sum_load);
+		#endif
+	}
+    // record loading information
+    cpu_loading = max_load_freq / policy->cur;
+    // dispatch power budget
+    if(g_thermal_count >= dbs_tuners_ins.thermal_dispatch_avg_times) {
+        g_thermal_count = 0;
+        mt_dvfs_power_dispatch_safe();
+        if ((dbs_thermal_limited == 1) && (policy->cur > dbs_thermal_limited_freq))
+    		__cpufreq_driver_target(policy, dbs_thermal_limited_freq, CPUFREQ_RELATION_L);
+    }
+    else
+        g_thermal_count++;
+
+    if (policy->cur >= get_normal_max_freq()){
+        if ((max_load_freq > dbs_tuners_ins.od_threshold * policy->cur) && (num_online_cpus() == num_possible_cpus())){
+            g_max_cpu_persist_count++;
+		    #ifdef DEBUG_LOG
+            printk("dvfs_od: g_max_cpu_persist_count: %d\n", g_max_cpu_persist_count);
+    		#endif
+            if(g_max_cpu_persist_count == DEF_CPU_PERSIST_COUNT){
+                //only ramp up to OD OPP here
+		        #ifdef DEBUG_LOG
+		        printk("dvfs_od: cpu loading = %d\n", max_load_freq/policy->cur);
+	    	    #endif
+                if (policy->cur < policy->max)
+                    this_dbs_info->rate_mult =
+                        dbs_tuners_ins.sampling_down_factor;
+                dbs_freq_increase(policy, policy->max);
+		        #ifdef DEBUG_LOG
+                printk("reset g_max_cpu_persist_count, count = 10\n");
+    		    #endif
+                g_max_cpu_persist_count = 0;
+                goto hp_check;
+            }
+        }
+        else {
+            g_max_cpu_persist_count = 0;
+        }
+    }
+    else{
+        if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) {
+    		/* If switching to max speed, apply sampling_down_factor */
+	    	if (policy->cur < get_normal_max_freq())
+		    	this_dbs_info->rate_mult =
+			    	dbs_tuners_ins.sampling_down_factor;
+    		dbs_freq_increase(policy, get_normal_max_freq());
+            if(g_max_cpu_persist_count != 0){
+                g_max_cpu_persist_count = 0;
+    		    #ifdef DEBUG_LOG
+                printk("reset g_max_cpu_persist_count, and fallback to normal max\n");
+                #endif
+            }
+	    	goto hp_check;
+       }
+    }
+
+	/* Check for frequency decrease */
+	/* if we cannot reduce the frequency anymore, break out early */
+	if (policy->cur == policy->min)
+		goto hp_check;
+
+	/*
+	 * The optimal frequency is the frequency that is the lowest that
+	 * can support the current CPU usage without triggering the up
+	 * policy. To be safe, we focus 10 points under the threshold.
+	 */
+	if (max_load_freq <
+	    (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) *
+	     policy->cur) {
+		unsigned int freq_next;
+		freq_next = max_load_freq /
+				(dbs_tuners_ins.up_threshold -
+				 dbs_tuners_ins.down_differential);
+
+		/* No longer fully busy, reset rate_mult */
+		this_dbs_info->rate_mult = 1;
+
+		if (freq_next < policy->min)
+			freq_next = policy->min;
+
+        if(g_max_cpu_persist_count != 0){
+            g_max_cpu_persist_count = 0;
+		    #ifdef DEBUG_LOG
+            printk("reset g_max_cpu_persist_count, decrease freq accrording to loading\n");
+            #endif
+        }
+
+		if (!dbs_tuners_ins.powersave_bias) {
+			__cpufreq_driver_target(policy, freq_next,
+					CPUFREQ_RELATION_L);
+		} else {
+			int freq = powersave_bias_target(policy, freq_next,
+					CPUFREQ_RELATION_L);
+			__cpufreq_driver_target(policy, freq,
+				CPUFREQ_RELATION_L);
+		}
+	}
+
+hp_check:
+
+	/* If Hot Plug policy disable, return directly */
+	if (dbs_tuners_ins.is_cpu_hotplug_disable)
+		return;
+
+	#ifdef CONFIG_SMP
+	mutex_lock(&hp_mutex);
+
+	/* Check CPU loading to power up slave CPU */
+	if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) {
+		raise_freq = true;
+		printk("dbs_check_cpu: turn on CPU by perf service\n");
+		g_next_hp_action = 1;
+		schedule_delayed_work_on(0, &hp_work, 0);
+	} else if (num_online_cpus() < num_possible_cpus() && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) {
+		g_cpu_up_count++;
+		g_cpu_up_sum_load += cpus_sum_load;
+		if (g_cpu_up_count == dbs_tuners_ins.cpu_up_avg_times) {
+			g_cpu_up_sum_load /= dbs_tuners_ins.cpu_up_avg_times;
+			if (g_cpu_up_sum_load >
+				(dbs_tuners_ins.cpu_up_threshold * num_online_cpus())) {
+				#ifdef DEBUG_LOG
+				printk("dbs_check_cpu: g_cpu_up_sum_load = %d\n", g_cpu_up_sum_load);
+				#endif
+				raise_freq = true;
+				printk("dbs_check_cpu: turn on CPU\n");
+				g_next_hp_action = 1;
+				schedule_delayed_work_on(0, &hp_work, 0);
+			}
+			g_cpu_up_count = 0;
+			g_cpu_up_sum_load = 0;
+		}
+		#ifdef DEBUG_LOG
+		printk("dbs_check_cpu: g_cpu_up_count = %d, g_cpu_up_sum_load = %d\n", g_cpu_up_count, g_cpu_up_sum_load);
+		printk("dbs_check_cpu: cpu_up_threshold = %d\n", (dbs_tuners_ins.cpu_up_threshold * num_online_cpus()));
+		#endif
+	}
+
+	/* Check CPU loading to power down slave CPU */
+	if (num_online_cpus() > 1) {
+		g_cpu_down_count++;
+		g_cpu_down_sum_load += cpus_sum_load;
+		if (g_cpu_down_count == dbs_tuners_ins.cpu_down_avg_times) {
+			g_cpu_down_sum_load /= dbs_tuners_ins.cpu_down_avg_times;
+			if (g_cpu_down_sum_load <
+				((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1))) {
+				if (num_online_cpus() > dbs_tuners_ins.cpu_num_base) {
+				#ifdef DEBUG_LOG
+				printk("dbs_check_cpu: g_cpu_down_sum_load = %d\n", g_cpu_down_sum_load);
+				#endif
+				raise_freq = true;
+				printk("dbs_check_cpu: turn off CPU\n");
+				g_next_hp_action = 0;
+				schedule_delayed_work_on(0, &hp_work, 0);
+				}
+			}
+			g_cpu_down_count = 0;
+			g_cpu_down_sum_load = 0;
+		}
+		#ifdef DEBUG_LOG
+		printk("dbs_check_cpu: g_cpu_down_count = %d, g_cpu_down_sum_load = %d\n", g_cpu_down_count, g_cpu_down_sum_load);
+		printk("dbs_check_cpu: cpu_down_threshold = %d\n", ((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1)));
+		#endif
+	}
+
+	mutex_unlock(&hp_mutex);
+	#endif
+	// need to retrieve dbs_freq_increase out of hp_mutex
+	// in case of self-deadlock
+	if(raise_freq == true)
+		dbs_freq_increase(policy, policy->max);
+
+	return;
+}
+
+static void do_dbs_timer(struct work_struct *work)
+{
+	struct cpu_dbs_info_s *dbs_info =
+		container_of(work, struct cpu_dbs_info_s, work.work);
+	unsigned int cpu = dbs_info->cpu;
+	int sample_type = dbs_info->sample_type;
+
+	int delay;
+
+	mutex_lock(&dbs_info->timer_mutex);
+
+	/* Common NORMAL_SAMPLE setup */
+	dbs_info->sample_type = DBS_NORMAL_SAMPLE;
+	if (!dbs_tuners_ins.powersave_bias ||
+	    sample_type == DBS_NORMAL_SAMPLE) {
+		dbs_check_cpu(dbs_info);
+		if (dbs_info->freq_lo) {
+			/* Setup timer for SUB_SAMPLE */
+			dbs_info->sample_type = DBS_SUB_SAMPLE;
+			delay = dbs_info->freq_hi_jiffies;
+		} else {
+			/* We want all CPUs to do sampling nearly on
+			 * same jiffy
+			 */
+			delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate
+				* dbs_info->rate_mult);
+
+			if (num_online_cpus() > 1)
+				delay -= jiffies % delay;
+		}
+	} else {
+		__cpufreq_driver_target(dbs_info->cur_policy,
+			dbs_info->freq_lo, CPUFREQ_RELATION_H);
+		delay = dbs_info->freq_lo_jiffies;
+	}
+	schedule_delayed_work_on(cpu, &dbs_info->work, delay);
+	mutex_unlock(&dbs_info->timer_mutex);
+}
+
+static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
+{
+	/* We want all CPUs to do sampling nearly on same jiffy */
+	int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+
+	if (num_online_cpus() > 1)
+		delay -= jiffies % delay;
+
+	dbs_info->sample_type = DBS_NORMAL_SAMPLE;
+	INIT_DELAYED_WORK(&dbs_info->work, do_dbs_timer);
+	schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
+}
+
+static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
+{
+	cancel_delayed_work_sync(&dbs_info->work);
+}
+
+/*
+ * Not all CPUs want IO time to be accounted as busy; this dependson how
+ * efficient idling at a higher frequency/voltage is.
+ * Pavel Machek says this is not so for various generations of AMD and old
+ * Intel systems.
+ * Mike Chan (androidlcom) calis this is also not true for ARM.
+ * Because of this, whitelist specific known (series) of CPUs by default, and
+ * leave all others up to the user.
+ */
+static int should_io_be_busy(void)
+{
+#if defined(CONFIG_X86)
+	/*
+	 * For Intel, Core 2 (model 15) andl later have an efficient idle.
+	 */
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+	    boot_cpu_data.x86 == 6 &&
+	    boot_cpu_data.x86_model >= 15)
+		return 1;
+#endif
+	return 1; // io wait time should be subtracted from idle time
+}
+
+#if INPUT_BOOST
+static void dbs_input_event(struct input_handle *handle, unsigned int type,
+		unsigned int code, int value)
+{
+	if ((type == EV_KEY) && (code == BTN_TOUCH) && (value == 1) && (dbs_tuners_ins.cpu_input_boost_enable))
+	{
+		force_two_core();
+	}
+}
+
+static int dbs_input_connect(struct input_handler *handler,
+		struct input_dev *dev, const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "cpufreq_balance";
+
+	error = input_register_handle(handle);
+	if (error)
+		goto err2;
+
+	error = input_open_device(handle);
+	if (error)
+		goto err1;
+
+	return 0;
+err1:
+	input_unregister_handle(handle);
+err2:
+	kfree(handle);
+	return error;
+}
+
+static void dbs_input_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id dbs_ids[] = {
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+                         INPUT_DEVICE_ID_MATCH_ABSBIT,
+                .evbit = { BIT_MASK(EV_ABS) },
+                .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] =
+                            BIT_MASK(ABS_MT_POSITION_X) |
+                            BIT_MASK(ABS_MT_POSITION_Y) },
+        }, /* multi-touch touchscreen */
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_KEYBIT |
+                         INPUT_DEVICE_ID_MATCH_ABSBIT,
+                .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
+                .absbit = { [BIT_WORD(ABS_X)] =
+                            BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
+        }, /* touchpad */
+        { },
+};
+
+static struct input_handler dbs_input_handler = {
+	.event		= dbs_input_event,
+	.connect	= dbs_input_connect,
+	.disconnect	= dbs_input_disconnect,
+	.name		= "cpufreq_balance",
+	.id_table	= dbs_ids,
+};
+#endif //#ifdef CONFIG_HOTPLUG_CPU
+
+
+
+static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+				   unsigned int event)
+{
+	unsigned int cpu = policy->cpu;
+	struct cpu_dbs_info_s *this_dbs_info;
+	unsigned int j;
+	int rc;
+
+	this_dbs_info = &per_cpu(hp_cpu_dbs_info, cpu);
+
+	switch (event) {
+	case CPUFREQ_GOV_START:
+		if ((!cpu_online(cpu)) || (!policy->cur))
+			return -EINVAL;
+
+		mutex_lock(&dbs_mutex);
+
+		dbs_enable++;
+		for_each_cpu(j, policy->cpus) {
+			struct cpu_dbs_info_s *j_dbs_info;
+			j_dbs_info = &per_cpu(hp_cpu_dbs_info, j);
+			j_dbs_info->cur_policy = policy;
+
+			j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
+                                                                      &j_dbs_info->prev_cpu_wall,
+                                                                      dbs_tuners_ins.io_is_busy);
+
+			if (dbs_tuners_ins.ignore_nice)
+				j_dbs_info->prev_cpu_nice =
+						kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+		}
+		this_dbs_info->cpu = cpu;
+		this_dbs_info->rate_mult = 1;
+		hotplug_powersave_bias_init_cpu(cpu);
+		/*
+		 * Start the timerschedule work, when this governor
+		 * is used for first time
+		 */
+		if (dbs_enable == 1) {
+			unsigned int latency;
+
+			rc = sysfs_create_group(cpufreq_global_kobject,
+						&dbs_attr_group);
+			if (rc) {
+				mutex_unlock(&dbs_mutex);
+				return rc;
+			}
+
+			/* policy latency is in nS. Convert it to uS first */
+			latency = policy->cpuinfo.transition_latency / 1000;
+			if (latency == 0)
+				latency = 1;
+			/* Bring kernel and HW constraints together */
+			min_sampling_rate = max(min_sampling_rate,
+					MIN_LATENCY_MULTIPLIER * latency);
+			dbs_tuners_ins.sampling_rate =
+				max(min_sampling_rate,
+				    latency * LATENCY_MULTIPLIER);
+			dbs_tuners_ins.io_is_busy = should_io_be_busy();
+
+			#ifdef DEBUG_LOG
+			printk("cpufreq_governor_dbs: min_sampling_rate = %d\n", min_sampling_rate);
+			printk("cpufreq_governor_dbs: dbs_tuners_ins.sampling_rate = %d\n", dbs_tuners_ins.sampling_rate);
+			printk("cpufreq_governor_dbs: dbs_tuners_ins.io_is_busy = %d\n", dbs_tuners_ins.io_is_busy);
+			#endif
+		}
+#if INPUT_BOOST
+		if (!cpu)
+			rc = input_register_handler(&dbs_input_handler);
+#endif
+		mutex_unlock(&dbs_mutex);
+
+		mutex_init(&this_dbs_info->timer_mutex);
+		dbs_timer_init(this_dbs_info);
+		break;
+
+	case CPUFREQ_GOV_STOP:
+		dbs_timer_exit(this_dbs_info);
+
+		mutex_lock(&dbs_mutex);
+		mutex_destroy(&this_dbs_info->timer_mutex);
+		dbs_enable--;
+#if INPUT_BOOST
+		if (!cpu)
+			input_unregister_handler(&dbs_input_handler);
+
+#endif
+		mutex_unlock(&dbs_mutex);
+		if (!dbs_enable)
+			sysfs_remove_group(cpufreq_global_kobject,
+					   &dbs_attr_group);
+
+		break;
+
+	case CPUFREQ_GOV_LIMITS:
+		mutex_lock(&this_dbs_info->timer_mutex);
+		if (get_normal_max_freq() < this_dbs_info->cur_policy->cur)
+			__cpufreq_driver_target(this_dbs_info->cur_policy,
+				get_normal_max_freq(), CPUFREQ_RELATION_H);
+		else if (policy->min > this_dbs_info->cur_policy->cur)
+			__cpufreq_driver_target(this_dbs_info->cur_policy,
+				policy->min, CPUFREQ_RELATION_L);
+		mutex_unlock(&this_dbs_info->timer_mutex);
+		break;
+	}
+	return 0;
+}
+
+/*int cpufreq_gov_dbs_get_sum_load(void)
+{
+	return cpus_sum_load;
+}*/
+
+#if INPUT_BOOST
+static int touch_freq_up_task(void *data)
+{
+	struct cpufreq_policy *policy;
+
+	while (1) {
+		policy = cpufreq_cpu_get(0);
+                if(policy != NULL)
+		{
+                    dbs_freq_increase(policy, policy->max);
+                    cpufreq_cpu_put(policy);
+                }
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule();
+
+		if (kthread_should_stop())
+			break;
+	}
+
+	return 0;
+}
+#endif
+
+static int __init cpufreq_gov_dbs_init(void)
+{
+	u64 idle_time;
+	int cpu = get_cpu();
+
+	#if INPUT_BOOST
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+	#endif
+
+	idle_time = get_cpu_idle_time_us(cpu, NULL);
+	put_cpu();
+	if (idle_time != -1ULL) {
+		/* Idle micro accounting is supported. Use finer thresholds */
+		dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
+		dbs_tuners_ins.down_differential =
+					MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
+		dbs_tuners_ins.cpu_up_threshold =
+					MICRO_CPU_UP_THRESHOLD;
+		dbs_tuners_ins.cpu_down_differential =
+					MICRO_CPU_DOWN_DIFFERENTIAL;
+		/*
+		 * In nohz/micro accounting case we set the minimum frequency
+		 * not depending on HZ, but fixed (very low). The deferred
+		 * timer might skip some samples if idle/sleeping as needed.
+		*/
+		min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
+	} else {
+		/* For correct statistics, we need 10 ticks for each measure */
+		min_sampling_rate =
+			MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
+	}
+
+	dbs_tuners_ins.cpu_num_limit = num_possible_cpus();
+	dbs_tuners_ins.cpu_num_base = 1;
+
+	if (dbs_tuners_ins.cpu_num_limit > 1)
+		dbs_tuners_ins.is_cpu_hotplug_disable = 0;
+
+	#ifdef CONFIG_SMP
+	INIT_DELAYED_WORK(&hp_work, hp_work_handler);
+	#endif
+
+
+	#if INPUT_BOOST
+	freq_up_task = kthread_create(touch_freq_up_task, NULL,
+		"touch_freq_up_task");
+	if (IS_ERR(freq_up_task))
+		return PTR_ERR(freq_up_task);
+
+	sched_setscheduler_nocheck(freq_up_task, SCHED_FIFO, &param);
+	get_task_struct(freq_up_task);
+	#endif
+
+	#ifdef DEBUG_LOG
+	printk("cpufreq_gov_dbs_init: min_sampling_rate = %d\n", min_sampling_rate);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.up_threshold = %d\n", dbs_tuners_ins.up_threshold);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.od_threshold = %d\n", dbs_tuners_ins.od_threshold);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.down_differential = %d\n", dbs_tuners_ins.down_differential);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_threshold = %d\n", dbs_tuners_ins.cpu_up_threshold);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_differential = %d\n", dbs_tuners_ins.cpu_down_differential);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_avg_times = %d\n", dbs_tuners_ins.cpu_up_avg_times);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_avg_times = %d\n", dbs_tuners_ins.cpu_down_avg_times);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.thermal_di_avg_times = %d\n", dbs_tuners_ins.thermal_dispatch_avg_times);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_limit = %d\n", dbs_tuners_ins.cpu_num_limit);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_base = %d\n", dbs_tuners_ins.cpu_num_base);
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.is_cpu_hotplug_disable = %d\n", dbs_tuners_ins.is_cpu_hotplug_disable);
+	#if INPUT_BOOST
+	printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_input_boost_enable = %d\n", dbs_tuners_ins.cpu_input_boost_enable);
+	#endif /* INPUT_BOOST */
+	#endif /* DEBUG_LOG */
+
+	return cpufreq_register_governor(&cpufreq_gov_balance);
+}
+
+static void __exit cpufreq_gov_dbs_exit(void)
+{
+	#ifdef CONFIG_SMP
+	cancel_delayed_work_sync(&hp_work);
+	#endif
+
+	cpufreq_unregister_governor(&cpufreq_gov_balance);
+
+	#if INPUT_BOOST
+	kthread_stop(freq_up_task);
+	put_task_struct(freq_up_task);
+	#endif
+}
+
+
+MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
+MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
+MODULE_DESCRIPTION("'cpufreq_balance' - A dynamic cpufreq governor for "
+	"Low Latency Frequency Transition capable processors");
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE
+fs_initcall(cpufreq_gov_dbs_init);
+#else
+module_init(cpufreq_gov_dbs_init);
+#endif
+module_exit(cpufreq_gov_dbs_exit);