linux/drivers/cpufreq/speedstep-lib.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *
 *  Library for common functions for Intel SpeedStep v.1 and v.2 support
 *
 *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
 */



/* processors */
enum speedstep_processor { … };

/* speedstep states -- only two of them */

#define SPEEDSTEP_HIGH …
#define SPEEDSTEP_LOW …


/* detect a speedstep-capable processor */
extern enum speedstep_processor speedstep_detect_processor(void);

/* detect the current speed (in khz) of the processor */
extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);


/* detect the low and high speeds of the processor. The callback
 * set_state"'s first argument is either SPEEDSTEP_HIGH or
 * SPEEDSTEP_LOW; the second argument is zero so that no
 * cpufreq_notify_transition calls are initiated.
 */
extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
	unsigned int *low_speed,
	unsigned int *high_speed,
	unsigned int *transition_latency,
	void (*set_state) (unsigned int state));