Merge remote-tracking branches 'asoc/topic/88pm860x', 'asoc/topic/ac97', 'asoc/topic...
[linux-drm-fsl-dcu.git] / include / linux / cpufreq.h
1 /*
2  * linux/include/linux/cpufreq.h
3  *
4  * Copyright (C) 2001 Russell King
5  *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #ifndef _LINUX_CPUFREQ_H
12 #define _LINUX_CPUFREQ_H
13
14 #include <linux/clk.h>
15 #include <linux/cpumask.h>
16 #include <linux/completion.h>
17 #include <linux/kobject.h>
18 #include <linux/notifier.h>
19 #include <linux/spinlock.h>
20 #include <linux/sysfs.h>
21
22 /*********************************************************************
23  *                        CPUFREQ INTERFACE                          *
24  *********************************************************************/
25 /*
26  * Frequency values here are CPU kHz
27  *
28  * Maximum transition latency is in nanoseconds - if it's unknown,
29  * CPUFREQ_ETERNAL shall be used.
30  */
31
32 #define CPUFREQ_ETERNAL                 (-1)
33 #define CPUFREQ_NAME_LEN                16
34 /* Print length for names. Extra 1 space for accomodating '\n' in prints */
35 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
36
37 struct cpufreq_governor;
38
39 struct cpufreq_freqs {
40         unsigned int cpu;       /* cpu nr */
41         unsigned int old;
42         unsigned int new;
43         u8 flags;               /* flags of cpufreq_driver, see below. */
44 };
45
46 struct cpufreq_cpuinfo {
47         unsigned int            max_freq;
48         unsigned int            min_freq;
49
50         /* in 10^(-9) s = nanoseconds */
51         unsigned int            transition_latency;
52 };
53
54 struct cpufreq_real_policy {
55         unsigned int            min;    /* in kHz */
56         unsigned int            max;    /* in kHz */
57         unsigned int            policy; /* see above */
58         struct cpufreq_governor *governor; /* see below */
59 };
60
61 struct cpufreq_policy {
62         /* CPUs sharing clock, require sw coordination */
63         cpumask_var_t           cpus;   /* Online CPUs only */
64         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
65         cpumask_var_t           real_cpus; /* Related and present */
66
67         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
68                                                 should set cpufreq */
69         unsigned int            cpu;    /* cpu managing this policy, must be online */
70         unsigned int            kobj_cpu; /* cpu managing sysfs files, can be offline */
71
72         struct clk              *clk;
73         struct cpufreq_cpuinfo  cpuinfo;/* see above */
74
75         unsigned int            min;    /* in kHz */
76         unsigned int            max;    /* in kHz */
77         unsigned int            cur;    /* in kHz, only needed if cpufreq
78                                          * governors are used */
79         unsigned int            restore_freq; /* = policy->cur before transition */
80         unsigned int            suspend_freq; /* freq to set during suspend */
81
82         unsigned int            policy; /* see above */
83         struct cpufreq_governor *governor; /* see below */
84         void                    *governor_data;
85         bool                    governor_enabled; /* governor start/stop flag */
86         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
87
88         struct work_struct      update; /* if update_policy() needs to be
89                                          * called, but you're in IRQ context */
90
91         struct cpufreq_real_policy      user_policy;
92         struct cpufreq_frequency_table  *freq_table;
93
94         struct list_head        policy_list;
95         struct kobject          kobj;
96         struct completion       kobj_unregister;
97
98         /*
99          * The rules for this semaphore:
100          * - Any routine that wants to read from the policy structure will
101          *   do a down_read on this semaphore.
102          * - Any routine that will write to the policy structure and/or may take away
103          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
104          *   mode before doing so.
105          *
106          * Additional rules:
107          * - Lock should not be held across
108          *     __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
109          */
110         struct rw_semaphore     rwsem;
111
112         /* Synchronization for frequency transitions */
113         bool                    transition_ongoing; /* Tracks transition status */
114         spinlock_t              transition_lock;
115         wait_queue_head_t       transition_wait;
116         struct task_struct      *transition_task; /* Task which is doing the transition */
117
118         /* cpufreq-stats */
119         struct cpufreq_stats    *stats;
120
121         /* For cpufreq driver's internal use */
122         void                    *driver_data;
123 };
124
125 /* Only for ACPI */
126 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
127 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
128 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
129 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
130
131 #ifdef CONFIG_CPU_FREQ
132 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
133 void cpufreq_cpu_put(struct cpufreq_policy *policy);
134 #else
135 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
136 {
137         return NULL;
138 }
139 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
140 #endif
141
142 static inline bool policy_is_shared(struct cpufreq_policy *policy)
143 {
144         return cpumask_weight(policy->cpus) > 1;
145 }
146
147 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
148 extern struct kobject *cpufreq_global_kobject;
149 int cpufreq_get_global_kobject(void);
150 void cpufreq_put_global_kobject(void);
151 int cpufreq_sysfs_create_file(const struct attribute *attr);
152 void cpufreq_sysfs_remove_file(const struct attribute *attr);
153
154 #ifdef CONFIG_CPU_FREQ
155 unsigned int cpufreq_get(unsigned int cpu);
156 unsigned int cpufreq_quick_get(unsigned int cpu);
157 unsigned int cpufreq_quick_get_max(unsigned int cpu);
158 void disable_cpufreq(void);
159
160 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
161 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
162 int cpufreq_update_policy(unsigned int cpu);
163 bool have_governor_per_policy(void);
164 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
165 #else
166 static inline unsigned int cpufreq_get(unsigned int cpu)
167 {
168         return 0;
169 }
170 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
171 {
172         return 0;
173 }
174 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
175 {
176         return 0;
177 }
178 static inline void disable_cpufreq(void) { }
179 #endif
180
181 /*********************************************************************
182  *                      CPUFREQ DRIVER INTERFACE                     *
183  *********************************************************************/
184
185 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
186 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
187 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
188
189 struct freq_attr {
190         struct attribute attr;
191         ssize_t (*show)(struct cpufreq_policy *, char *);
192         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
193 };
194
195 #define cpufreq_freq_attr_ro(_name)             \
196 static struct freq_attr _name =                 \
197 __ATTR(_name, 0444, show_##_name, NULL)
198
199 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
200 static struct freq_attr _name =                 \
201 __ATTR(_name, _perm, show_##_name, NULL)
202
203 #define cpufreq_freq_attr_rw(_name)             \
204 static struct freq_attr _name =                 \
205 __ATTR(_name, 0644, show_##_name, store_##_name)
206
207 struct global_attr {
208         struct attribute attr;
209         ssize_t (*show)(struct kobject *kobj,
210                         struct attribute *attr, char *buf);
211         ssize_t (*store)(struct kobject *a, struct attribute *b,
212                          const char *c, size_t count);
213 };
214
215 #define define_one_global_ro(_name)             \
216 static struct global_attr _name =               \
217 __ATTR(_name, 0444, show_##_name, NULL)
218
219 #define define_one_global_rw(_name)             \
220 static struct global_attr _name =               \
221 __ATTR(_name, 0644, show_##_name, store_##_name)
222
223
224 struct cpufreq_driver {
225         char            name[CPUFREQ_NAME_LEN];
226         u8              flags;
227         void            *driver_data;
228
229         /* needed by all drivers */
230         int             (*init)(struct cpufreq_policy *policy);
231         int             (*verify)(struct cpufreq_policy *policy);
232
233         /* define one out of two */
234         int             (*setpolicy)(struct cpufreq_policy *policy);
235
236         /*
237          * On failure, should always restore frequency to policy->restore_freq
238          * (i.e. old freq).
239          */
240         int             (*target)(struct cpufreq_policy *policy,
241                                   unsigned int target_freq,
242                                   unsigned int relation);       /* Deprecated */
243         int             (*target_index)(struct cpufreq_policy *policy,
244                                         unsigned int index);
245         /*
246          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
247          * unset.
248          *
249          * get_intermediate should return a stable intermediate frequency
250          * platform wants to switch to and target_intermediate() should set CPU
251          * to to that frequency, before jumping to the frequency corresponding
252          * to 'index'. Core will take care of sending notifications and driver
253          * doesn't have to handle them in target_intermediate() or
254          * target_index().
255          *
256          * Drivers can return '0' from get_intermediate() in case they don't
257          * wish to switch to intermediate frequency for some target frequency.
258          * In that case core will directly call ->target_index().
259          */
260         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
261                                             unsigned int index);
262         int             (*target_intermediate)(struct cpufreq_policy *policy,
263                                                unsigned int index);
264
265         /* should be defined, if possible */
266         unsigned int    (*get)(unsigned int cpu);
267
268         /* optional */
269         int             (*bios_limit)(int cpu, unsigned int *limit);
270
271         int             (*exit)(struct cpufreq_policy *policy);
272         void            (*stop_cpu)(struct cpufreq_policy *policy);
273         int             (*suspend)(struct cpufreq_policy *policy);
274         int             (*resume)(struct cpufreq_policy *policy);
275
276         /* Will be called after the driver is fully initialized */
277         void            (*ready)(struct cpufreq_policy *policy);
278
279         struct freq_attr **attr;
280
281         /* platform specific boost support code */
282         bool            boost_supported;
283         bool            boost_enabled;
284         int             (*set_boost)(int state);
285 };
286
287 /* flags */
288 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
289                                                    all ->init() calls failed */
290 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
291                                                    kernel "constants" aren't
292                                                    affected by frequency
293                                                    transitions */
294 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
295                                                    speed mismatches */
296
297 /*
298  * This should be set by platforms having multiple clock-domains, i.e.
299  * supporting multiple policies. With this sysfs directories of governor would
300  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
301  * governor with different tunables for different clusters.
302  */
303 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
304
305 /*
306  * Driver will do POSTCHANGE notifications from outside of their ->target()
307  * routine and so must set cpufreq_driver->flags with this flag, so that core
308  * can handle them specially.
309  */
310 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
311
312 /*
313  * Set by drivers which want cpufreq core to check if CPU is running at a
314  * frequency present in freq-table exposed by the driver. For these drivers if
315  * CPU is found running at an out of table freq, we will try to set it to a freq
316  * from the table. And if that fails, we will stop further boot process by
317  * issuing a BUG_ON().
318  */
319 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
320
321 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
322 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
323
324 const char *cpufreq_get_current_driver(void);
325 void *cpufreq_get_driver_data(void);
326
327 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
328                 unsigned int min, unsigned int max)
329 {
330         if (policy->min < min)
331                 policy->min = min;
332         if (policy->max < min)
333                 policy->max = min;
334         if (policy->min > max)
335                 policy->min = max;
336         if (policy->max > max)
337                 policy->max = max;
338         if (policy->min > policy->max)
339                 policy->min = policy->max;
340         return;
341 }
342
343 static inline void
344 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
345 {
346         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
347                         policy->cpuinfo.max_freq);
348 }
349
350 #ifdef CONFIG_CPU_FREQ
351 void cpufreq_suspend(void);
352 void cpufreq_resume(void);
353 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
354 #else
355 static inline void cpufreq_suspend(void) {}
356 static inline void cpufreq_resume(void) {}
357 #endif
358
359 /*********************************************************************
360  *                     CPUFREQ NOTIFIER INTERFACE                    *
361  *********************************************************************/
362
363 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
364 #define CPUFREQ_POLICY_NOTIFIER         (1)
365
366 /* Transition notifiers */
367 #define CPUFREQ_PRECHANGE               (0)
368 #define CPUFREQ_POSTCHANGE              (1)
369
370 /* Policy Notifiers  */
371 #define CPUFREQ_ADJUST                  (0)
372 #define CPUFREQ_INCOMPATIBLE            (1)
373 #define CPUFREQ_NOTIFY                  (2)
374 #define CPUFREQ_START                   (3)
375 #define CPUFREQ_CREATE_POLICY           (4)
376 #define CPUFREQ_REMOVE_POLICY           (5)
377
378 #ifdef CONFIG_CPU_FREQ
379 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
380 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
381
382 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
383                 struct cpufreq_freqs *freqs);
384 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
385                 struct cpufreq_freqs *freqs, int transition_failed);
386
387 #else /* CONFIG_CPU_FREQ */
388 static inline int cpufreq_register_notifier(struct notifier_block *nb,
389                                                 unsigned int list)
390 {
391         return 0;
392 }
393 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
394                                                 unsigned int list)
395 {
396         return 0;
397 }
398 #endif /* !CONFIG_CPU_FREQ */
399
400 /**
401  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
402  * safe)
403  * @old:   old value
404  * @div:   divisor
405  * @mult:  multiplier
406  *
407  *
408  * new = old * mult / div
409  */
410 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
411                 u_int mult)
412 {
413 #if BITS_PER_LONG == 32
414         u64 result = ((u64) old) * ((u64) mult);
415         do_div(result, div);
416         return (unsigned long) result;
417
418 #elif BITS_PER_LONG == 64
419         unsigned long result = old * ((u64) mult);
420         result /= div;
421         return result;
422 #endif
423 }
424
425 /*********************************************************************
426  *                          CPUFREQ GOVERNORS                        *
427  *********************************************************************/
428
429 /*
430  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
431  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
432  * two generic policies are available:
433  */
434 #define CPUFREQ_POLICY_POWERSAVE        (1)
435 #define CPUFREQ_POLICY_PERFORMANCE      (2)
436
437 /* Governor Events */
438 #define CPUFREQ_GOV_START       1
439 #define CPUFREQ_GOV_STOP        2
440 #define CPUFREQ_GOV_LIMITS      3
441 #define CPUFREQ_GOV_POLICY_INIT 4
442 #define CPUFREQ_GOV_POLICY_EXIT 5
443
444 struct cpufreq_governor {
445         char    name[CPUFREQ_NAME_LEN];
446         int     initialized;
447         int     (*governor)     (struct cpufreq_policy *policy,
448                                  unsigned int event);
449         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
450                                          char *buf);
451         int     (*store_setspeed)       (struct cpufreq_policy *policy,
452                                          unsigned int freq);
453         unsigned int max_transition_latency; /* HW must be able to switch to
454                         next freq faster than this value in nano secs or we
455                         will fallback to performance governor */
456         struct list_head        governor_list;
457         struct module           *owner;
458 };
459
460 /* Pass a target to the cpufreq driver */
461 int cpufreq_driver_target(struct cpufreq_policy *policy,
462                                  unsigned int target_freq,
463                                  unsigned int relation);
464 int __cpufreq_driver_target(struct cpufreq_policy *policy,
465                                    unsigned int target_freq,
466                                    unsigned int relation);
467 int cpufreq_register_governor(struct cpufreq_governor *governor);
468 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
469
470 /* CPUFREQ DEFAULT GOVERNOR */
471 /*
472  * Performance governor is fallback governor if any other gov failed to auto
473  * load due latency restrictions
474  */
475 #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
476 extern struct cpufreq_governor cpufreq_gov_performance;
477 #endif
478 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
479 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_performance)
480 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
481 extern struct cpufreq_governor cpufreq_gov_powersave;
482 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
483 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
484 extern struct cpufreq_governor cpufreq_gov_userspace;
485 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
486 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
487 extern struct cpufreq_governor cpufreq_gov_ondemand;
488 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
489 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
490 extern struct cpufreq_governor cpufreq_gov_conservative;
491 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_conservative)
492 #endif
493
494 /*********************************************************************
495  *                     FREQUENCY TABLE HELPERS                       *
496  *********************************************************************/
497
498 /* Special Values of .frequency field */
499 #define CPUFREQ_ENTRY_INVALID   ~0u
500 #define CPUFREQ_TABLE_END       ~1u
501 /* Special Values of .flags field */
502 #define CPUFREQ_BOOST_FREQ      (1 << 0)
503
504 struct cpufreq_frequency_table {
505         unsigned int    flags;
506         unsigned int    driver_data; /* driver specific data, not used by core */
507         unsigned int    frequency; /* kHz - doesn't need to be in ascending
508                                     * order */
509 };
510
511 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
512 int dev_pm_opp_init_cpufreq_table(struct device *dev,
513                                   struct cpufreq_frequency_table **table);
514 void dev_pm_opp_free_cpufreq_table(struct device *dev,
515                                    struct cpufreq_frequency_table **table);
516 #else
517 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
518                                                 struct cpufreq_frequency_table
519                                                 **table)
520 {
521         return -EINVAL;
522 }
523
524 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
525                                                  struct cpufreq_frequency_table
526                                                  **table)
527 {
528 }
529 #endif
530
531 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
532 {
533         while ((*pos)->frequency != CPUFREQ_TABLE_END)
534                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
535                         return true;
536                 else
537                         (*pos)++;
538         return false;
539 }
540
541 /*
542  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
543  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
544  * @table:      the cpufreq_frequency_table * to iterate over.
545  */
546
547 #define cpufreq_for_each_entry(pos, table)      \
548         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
549
550 /*
551  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
552  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
553  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
554  * @table:      the cpufreq_frequency_table * to iterate over.
555  */
556
557 #define cpufreq_for_each_valid_entry(pos, table)        \
558         for (pos = table; cpufreq_next_valid(&pos); pos++)
559
560 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
561                                     struct cpufreq_frequency_table *table);
562
563 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
564                                    struct cpufreq_frequency_table *table);
565 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
566
567 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
568                                    struct cpufreq_frequency_table *table,
569                                    unsigned int target_freq,
570                                    unsigned int relation,
571                                    unsigned int *index);
572 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
573                 unsigned int freq);
574
575 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
576
577 #ifdef CONFIG_CPU_FREQ
578 int cpufreq_boost_trigger_state(int state);
579 int cpufreq_boost_supported(void);
580 int cpufreq_boost_enabled(void);
581 #else
582 static inline int cpufreq_boost_trigger_state(int state)
583 {
584         return 0;
585 }
586 static inline int cpufreq_boost_supported(void)
587 {
588         return 0;
589 }
590 static inline int cpufreq_boost_enabled(void)
591 {
592         return 0;
593 }
594 #endif
595 /* the following funtion is for cpufreq core use only */
596 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
597
598 /* the following are really really optional */
599 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
600 extern struct freq_attr *cpufreq_generic_attr[];
601 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
602                                       struct cpufreq_frequency_table *table);
603
604 unsigned int cpufreq_generic_get(unsigned int cpu);
605 int cpufreq_generic_init(struct cpufreq_policy *policy,
606                 struct cpufreq_frequency_table *table,
607                 unsigned int transition_latency);
608 #endif /* _LINUX_CPUFREQ_H */