drivers/platform/x86/intel_telemetry_core.c - linux - Git at Google

 /*
  * Intel SoC Core Telemetry Driver
  * Copyright (C) 2015, Intel Corporation.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * Telemetry Framework provides platform related PM and performance statistics.
  * This file provides the core telemetry API implementation.
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>

 #include <asm/intel_telemetry.h>

 #define DRIVER_NAME "intel_telemetry_core"

 struct telemetry_core_config {
 	struct telemetry_plt_config *plt_config;
 	const struct telemetry_core_ops *telem_ops;
 };

 static struct telemetry_core_config telm_core_conf;

 static int telemetry_def_update_events(struct telemetry_evtconfig pss_evtconfig,
 				      struct telemetry_evtconfig ioss_evtconfig)
 {
 	return 0;
 }

 static int telemetry_def_set_sampling_period(u8 pss_period, u8 ioss_period)
 {
 	return 0;
 }

 static int telemetry_def_get_sampling_period(u8 *pss_min_period,
 					     u8 *pss_max_period,
 					     u8 *ioss_min_period,
 					     u8 *ioss_max_period)
 {
 	return 0;
 }

 static int telemetry_def_get_eventconfig(
 			struct telemetry_evtconfig *pss_evtconfig,
 			struct telemetry_evtconfig *ioss_evtconfig,
 			int pss_len, int ioss_len)
 {
 	return 0;
 }

 static int telemetry_def_get_trace_verbosity(enum telemetry_unit telem_unit,
 					     u32 *verbosity)
 {
 	return 0;
 }


 static int telemetry_def_set_trace_verbosity(enum telemetry_unit telem_unit,
 					     u32 verbosity)
 {
 	return 0;
 }

 static int telemetry_def_raw_read_eventlog(enum telemetry_unit telem_unit,
 					   struct telemetry_evtlog *evtlog,
 					   int len, int log_all_evts)
 {
 	return 0;
 }

 static int telemetry_def_read_eventlog(enum telemetry_unit telem_unit,
 				       struct telemetry_evtlog *evtlog,
 				       int len, int log_all_evts)
 {
 	return 0;
 }

 static int telemetry_def_add_events(u8 num_pss_evts, u8 num_ioss_evts,
 				    u32 *pss_evtmap, u32 *ioss_evtmap)
 {
 	return 0;
 }

 static int telemetry_def_reset_events(void)
 {
 	return 0;
 }

 static const struct telemetry_core_ops telm_defpltops = {
 	.set_sampling_period = telemetry_def_set_sampling_period,
 	.get_sampling_period = telemetry_def_get_sampling_period,
 	.get_trace_verbosity = telemetry_def_get_trace_verbosity,
 	.set_trace_verbosity = telemetry_def_set_trace_verbosity,
 	.raw_read_eventlog = telemetry_def_raw_read_eventlog,
 	.get_eventconfig = telemetry_def_get_eventconfig,
 	.read_eventlog = telemetry_def_read_eventlog,
 	.update_events = telemetry_def_update_events,
 	.reset_events = telemetry_def_reset_events,
 	.add_events = telemetry_def_add_events,
 };

 /**
  * telemetry_update_events() - Update telemetry Configuration
  * @pss_evtconfig: PSS related config. No change if num_evts = 0.
  * @pss_evtconfig: IOSS related config. No change if num_evts = 0.
  *
  * This API updates the IOSS & PSS Telemetry configuration. Old config
  * is overwritten. Call telemetry_reset_events when logging is over
  * All sample period values should be in the form of:
  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_update_events(struct telemetry_evtconfig pss_evtconfig,
 			    struct telemetry_evtconfig ioss_evtconfig)
 {
 	return telm_core_conf.telem_ops->update_events(pss_evtconfig,
 						       ioss_evtconfig);
 }
 EXPORT_SYMBOL_GPL(telemetry_update_events);


 /**
  * telemetry_set_sampling_period() - Sets the IOSS & PSS sampling period
  * @pss_period:  placeholder for PSS Period to be set.
  *		 Set to 0 if not required to be updated
  * @ioss_period: placeholder for IOSS Period to be set
  *		 Set to 0 if not required to be updated
  *
  * All values should be in the form of:
  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_set_sampling_period(u8 pss_period, u8 ioss_period)
 {
 	return telm_core_conf.telem_ops->set_sampling_period(pss_period,
 							     ioss_period);
 }
 EXPORT_SYMBOL_GPL(telemetry_set_sampling_period);

 /**
  * telemetry_get_sampling_period() - Get IOSS & PSS min & max sampling period
  * @pss_min_period:  placeholder for PSS Min Period supported
  * @pss_max_period:  placeholder for PSS Max Period supported
  * @ioss_min_period: placeholder for IOSS Min Period supported
  * @ioss_max_period: placeholder for IOSS Max Period supported
  *
  * All values should be in the form of:
  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_get_sampling_period(u8 *pss_min_period, u8 *pss_max_period,
 				  u8 *ioss_min_period, u8 *ioss_max_period)
 {
 	return telm_core_conf.telem_ops->get_sampling_period(pss_min_period,
 							     pss_max_period,
 							     ioss_min_period,
 							     ioss_max_period);
 }
 EXPORT_SYMBOL_GPL(telemetry_get_sampling_period);


 /**
  * telemetry_reset_events() - Restore the IOSS & PSS configuration to default
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_reset_events(void)
 {
 	return telm_core_conf.telem_ops->reset_events();
 }
 EXPORT_SYMBOL_GPL(telemetry_reset_events);

 /**
  * telemetry_get_eventconfig() - Returns the pss and ioss events enabled
  * @pss_evtconfig: Pointer to PSS related configuration.
  * @pss_evtconfig: Pointer to IOSS related configuration.
  * @pss_len:	   Number of u32 elements allocated for pss_evtconfig array
  * @ioss_len:	   Number of u32 elements allocated for ioss_evtconfig array
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_get_eventconfig(struct telemetry_evtconfig *pss_evtconfig,
 			      struct telemetry_evtconfig *ioss_evtconfig,
 			      int pss_len, int ioss_len)
 {
 	return telm_core_conf.telem_ops->get_eventconfig(pss_evtconfig,
 							 ioss_evtconfig,
 							 pss_len, ioss_len);
 }
 EXPORT_SYMBOL_GPL(telemetry_get_eventconfig);

 /**
  * telemetry_add_events() - Add IOSS & PSS configuration to existing settings.
  * @num_pss_evts:  Number of PSS Events (<29) in pss_evtmap. Can be 0.
  * @num_ioss_evts: Number of IOSS Events (<29) in ioss_evtmap. Can be 0.
  * @pss_evtmap:    Array of PSS Event-IDs to Enable
  * @ioss_evtmap:   Array of PSS Event-IDs to Enable
  *
  * Events are appended to Old Configuration. In case of total events > 28, it
  * returns error. Call telemetry_reset_events to reset after eventlog done
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_add_events(u8 num_pss_evts, u8 num_ioss_evts,
 			 u32 *pss_evtmap, u32 *ioss_evtmap)
 {
 	return telm_core_conf.telem_ops->add_events(num_pss_evts,
 						    num_ioss_evts, pss_evtmap,
 						    ioss_evtmap);
 }
 EXPORT_SYMBOL_GPL(telemetry_add_events);

 /**
  * telemetry_read_events() - Fetches samples as specified by evtlog.telem_evt_id
  * @telem_unit: Specify whether IOSS or PSS Read
  * @evtlog:     Array of telemetry_evtlog structs to fill data
  *		evtlog.telem_evt_id specifies the ids to read
  * @len:	Length of array of evtlog
  *
  * Return: number of eventlogs read for success, < 0 for failure
  */
 int telemetry_read_events(enum telemetry_unit telem_unit,
 			  struct telemetry_evtlog *evtlog, int len)
 {
 	return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
 						       len, 0);
 }
 EXPORT_SYMBOL_GPL(telemetry_read_events);

 /**
  * telemetry_raw_read_events() - Fetch samples specified by evtlog.telem_evt_id
  * @telem_unit: Specify whether IOSS or PSS Read
  * @evtlog:	Array of telemetry_evtlog structs to fill data
  *		evtlog.telem_evt_id specifies the ids to read
  * @len:	Length of array of evtlog
  *
  * The caller must take care of locking in this case.
  *
  * Return: number of eventlogs read for success, < 0 for failure
  */
 int telemetry_raw_read_events(enum telemetry_unit telem_unit,
 			      struct telemetry_evtlog *evtlog, int len)
 {
 	return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
 							   len, 0);
 }
 EXPORT_SYMBOL_GPL(telemetry_raw_read_events);

 /**
  * telemetry_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
  * @telem_unit: Specify whether IOSS or PSS Read
  * @evtlog:	Array of telemetry_evtlog structs to fill data
  * @len:	Length of array of evtlog
  *
  * Return: number of eventlogs read for success, < 0 for failure
  */
 int telemetry_read_eventlog(enum telemetry_unit telem_unit,
 			    struct telemetry_evtlog *evtlog, int len)
 {
 	return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
 						       len, 1);
 }
 EXPORT_SYMBOL_GPL(telemetry_read_eventlog);

 /**
  * telemetry_raw_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
  * @telem_unit: Specify whether IOSS or PSS Read
  * @evtlog:	Array of telemetry_evtlog structs to fill data
  * @len:	Length of array of evtlog
  *
  * The caller must take care of locking in this case.
  *
  * Return: number of eventlogs read for success, < 0 for failure
  */
 int telemetry_raw_read_eventlog(enum telemetry_unit telem_unit,
 				struct telemetry_evtlog *evtlog, int len)
 {
 	return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
 							   len, 1);
 }
 EXPORT_SYMBOL_GPL(telemetry_raw_read_eventlog);


 /**
  * telemetry_get_trace_verbosity() - Get the IOSS & PSS Trace verbosity
  * @telem_unit: Specify whether IOSS or PSS Read
  * @verbosity:	Pointer to return Verbosity
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_get_trace_verbosity(enum telemetry_unit telem_unit,
 				  u32 *verbosity)
 {
 	return telm_core_conf.telem_ops->get_trace_verbosity(telem_unit,
 							     verbosity);
 }
 EXPORT_SYMBOL_GPL(telemetry_get_trace_verbosity);


 /**
  * telemetry_set_trace_verbosity() - Update the IOSS & PSS Trace verbosity
  * @telem_unit: Specify whether IOSS or PSS Read
  * @verbosity:	Verbosity to set
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_set_trace_verbosity(enum telemetry_unit telem_unit, u32 verbosity)
 {
 	return telm_core_conf.telem_ops->set_trace_verbosity(telem_unit,
 							     verbosity);
 }
 EXPORT_SYMBOL_GPL(telemetry_set_trace_verbosity);

 /**
  * telemetry_set_pltdata() - Set the platform specific Data
  * @ops:	Pointer to ops structure
  * @pltconfig:	Platform config data
  *
  * Usage by other than telemetry pltdrv module is invalid
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_set_pltdata(const struct telemetry_core_ops *ops,
 			  struct telemetry_plt_config *pltconfig)
 {
 	if (ops)
 		telm_core_conf.telem_ops = ops;

 	if (pltconfig)
 		telm_core_conf.plt_config = pltconfig;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(telemetry_set_pltdata);

 /**
  * telemetry_clear_pltdata() - Clear the platform specific Data
  *
  * Usage by other than telemetry pltdrv module is invalid
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_clear_pltdata(void)
 {
 	telm_core_conf.telem_ops = &telm_defpltops;
 	telm_core_conf.plt_config = NULL;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(telemetry_clear_pltdata);

 /**
  * telemetry_pltconfig_valid() - Checkif platform config is valid
  *
  * Usage by other than telemetry module is invalid
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_pltconfig_valid(void)
 {
 	if (telm_core_conf.plt_config)
 		return 0;

 	else
 		return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(telemetry_pltconfig_valid);

 static inline int telemetry_get_pssevtname(enum telemetry_unit telem_unit,
 					   const char **name, int len)
 {
 	struct telemetry_unit_config psscfg;
 	int i;

 	if (!telm_core_conf.plt_config)
 		return -EINVAL;

 	psscfg = telm_core_conf.plt_config->pss_config;

 	if (len > psscfg.ssram_evts_used)
 		len = psscfg.ssram_evts_used;

 	for (i = 0; i < len; i++)
 		name[i] = psscfg.telem_evts[i].name;

 	return 0;
 }

 static inline int telemetry_get_iossevtname(enum telemetry_unit telem_unit,
 					    const char **name, int len)
 {
 	struct telemetry_unit_config iosscfg;
 	int i;

 	if (!(telm_core_conf.plt_config))
 		return -EINVAL;

 	iosscfg = telm_core_conf.plt_config->ioss_config;

 	if (len > iosscfg.ssram_evts_used)
 		len = iosscfg.ssram_evts_used;

 	for (i = 0; i < len; i++)
 		name[i] = iosscfg.telem_evts[i].name;

 	return 0;

 }

 /**
  * telemetry_get_evtname() - Checkif platform config is valid
  * @telem_unit:	Telemetry Unit to check
  * @name:	Array of character pointers to contain name
  * @len:	length of array name provided by user
  *
  * Usage by other than telemetry debugfs module is invalid
  *
  * Return: 0 success, < 0 for failure
  */
 int telemetry_get_evtname(enum telemetry_unit telem_unit,
 			  const char **name, int len)
 {
 	int ret = -EINVAL;

 	if (telem_unit == TELEM_PSS)
 		ret = telemetry_get_pssevtname(telem_unit, name, len);

 	else if (telem_unit == TELEM_IOSS)
 		ret = telemetry_get_iossevtname(telem_unit, name, len);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(telemetry_get_evtname);

 static int __init telemetry_module_init(void)
 {
 	pr_info(pr_fmt(DRIVER_NAME) " Init\n");

 	telm_core_conf.telem_ops = &telm_defpltops;
 	return 0;
 }

 static void __exit telemetry_module_exit(void)
 {
 }

 module_init(telemetry_module_init);
 module_exit(telemetry_module_exit);

 MODULE_AUTHOR("Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>");
 MODULE_DESCRIPTION("Intel SoC Telemetry Interface");
 MODULE_LICENSE("GPL");
	/*
	* Intel SoC Core Telemetry Driver
	* Copyright (C) 2015, Intel Corporation.
	* All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* Telemetry Framework provides platform related PM and performance statistics.
	* This file provides the core telemetry API implementation.
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>

	#include <asm/intel_telemetry.h>

	#define DRIVER_NAME "intel_telemetry_core"

	struct telemetry_core_config {
	struct telemetry_plt_config *plt_config;
	const struct telemetry_core_ops *telem_ops;
	};

	static struct telemetry_core_config telm_core_conf;

	static int telemetry_def_update_events(struct telemetry_evtconfig pss_evtconfig,
	struct telemetry_evtconfig ioss_evtconfig)
	{
	return 0;
	}

	static int telemetry_def_set_sampling_period(u8 pss_period, u8 ioss_period)
	{
	return 0;
	}

	static int telemetry_def_get_sampling_period(u8 *pss_min_period,
	u8 *pss_max_period,
	u8 *ioss_min_period,
	u8 *ioss_max_period)
	{
	return 0;
	}

	static int telemetry_def_get_eventconfig(
	struct telemetry_evtconfig *pss_evtconfig,
	struct telemetry_evtconfig *ioss_evtconfig,
	int pss_len, int ioss_len)
	{
	return 0;
	}

	static int telemetry_def_get_trace_verbosity(enum telemetry_unit telem_unit,
	u32 *verbosity)
	{
	return 0;
	}


	static int telemetry_def_set_trace_verbosity(enum telemetry_unit telem_unit,
	u32 verbosity)
	{
	return 0;
	}

	static int telemetry_def_raw_read_eventlog(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog,
	int len, int log_all_evts)
	{
	return 0;
	}

	static int telemetry_def_read_eventlog(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog,
	int len, int log_all_evts)
	{
	return 0;
	}

	static int telemetry_def_add_events(u8 num_pss_evts, u8 num_ioss_evts,
	u32 pss_evtmap, u32 ioss_evtmap)
	{
	return 0;
	}

	static int telemetry_def_reset_events(void)
	{
	return 0;
	}

	static const struct telemetry_core_ops telm_defpltops = {
	.set_sampling_period = telemetry_def_set_sampling_period,
	.get_sampling_period = telemetry_def_get_sampling_period,
	.get_trace_verbosity = telemetry_def_get_trace_verbosity,
	.set_trace_verbosity = telemetry_def_set_trace_verbosity,
	.raw_read_eventlog = telemetry_def_raw_read_eventlog,
	.get_eventconfig = telemetry_def_get_eventconfig,
	.read_eventlog = telemetry_def_read_eventlog,
	.update_events = telemetry_def_update_events,
	.reset_events = telemetry_def_reset_events,
	.add_events = telemetry_def_add_events,
	};

	/**
	* telemetry_update_events() - Update telemetry Configuration
	* @pss_evtconfig: PSS related config. No change if num_evts = 0.
	* @pss_evtconfig: IOSS related config. No change if num_evts = 0.
	*
	* This API updates the IOSS & PSS Telemetry configuration. Old config
	* is overwritten. Call telemetry_reset_events when logging is over
	* All sample period values should be in the form of:
	* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_update_events(struct telemetry_evtconfig pss_evtconfig,
	struct telemetry_evtconfig ioss_evtconfig)
	{
	return telm_core_conf.telem_ops->update_events(pss_evtconfig,
	ioss_evtconfig);
	}
	EXPORT_SYMBOL_GPL(telemetry_update_events);


	/**
	* telemetry_set_sampling_period() - Sets the IOSS & PSS sampling period
	* @pss_period: placeholder for PSS Period to be set.
	* Set to 0 if not required to be updated
	* @ioss_period: placeholder for IOSS Period to be set
	* Set to 0 if not required to be updated
	*
	* All values should be in the form of:
	* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_set_sampling_period(u8 pss_period, u8 ioss_period)
	{
	return telm_core_conf.telem_ops->set_sampling_period(pss_period,
	ioss_period);
	}
	EXPORT_SYMBOL_GPL(telemetry_set_sampling_period);

	/**
	* telemetry_get_sampling_period() - Get IOSS & PSS min & max sampling period
	* @pss_min_period: placeholder for PSS Min Period supported
	* @pss_max_period: placeholder for PSS Max Period supported
	* @ioss_min_period: placeholder for IOSS Min Period supported
	* @ioss_max_period: placeholder for IOSS Max Period supported
	*
	* All values should be in the form of:
	* bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_get_sampling_period(u8 pss_min_period, u8 pss_max_period,
	u8 ioss_min_period, u8 ioss_max_period)
	{
	return telm_core_conf.telem_ops->get_sampling_period(pss_min_period,
	pss_max_period,
	ioss_min_period,
	ioss_max_period);
	}
	EXPORT_SYMBOL_GPL(telemetry_get_sampling_period);


	/**
	* telemetry_reset_events() - Restore the IOSS & PSS configuration to default
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_reset_events(void)
	{
	return telm_core_conf.telem_ops->reset_events();
	}
	EXPORT_SYMBOL_GPL(telemetry_reset_events);

	/**
	* telemetry_get_eventconfig() - Returns the pss and ioss events enabled
	* @pss_evtconfig: Pointer to PSS related configuration.
	* @pss_evtconfig: Pointer to IOSS related configuration.
	* @pss_len: Number of u32 elements allocated for pss_evtconfig array
	* @ioss_len: Number of u32 elements allocated for ioss_evtconfig array
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_get_eventconfig(struct telemetry_evtconfig *pss_evtconfig,
	struct telemetry_evtconfig *ioss_evtconfig,
	int pss_len, int ioss_len)
	{
	return telm_core_conf.telem_ops->get_eventconfig(pss_evtconfig,
	ioss_evtconfig,
	pss_len, ioss_len);
	}
	EXPORT_SYMBOL_GPL(telemetry_get_eventconfig);

	/**
	* telemetry_add_events() - Add IOSS & PSS configuration to existing settings.
	* @num_pss_evts: Number of PSS Events (<29) in pss_evtmap. Can be 0.
	* @num_ioss_evts: Number of IOSS Events (<29) in ioss_evtmap. Can be 0.
	* @pss_evtmap: Array of PSS Event-IDs to Enable
	* @ioss_evtmap: Array of PSS Event-IDs to Enable
	*
	* Events are appended to Old Configuration. In case of total events > 28, it
	* returns error. Call telemetry_reset_events to reset after eventlog done
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_add_events(u8 num_pss_evts, u8 num_ioss_evts,
	u32 pss_evtmap, u32 ioss_evtmap)
	{
	return telm_core_conf.telem_ops->add_events(num_pss_evts,
	num_ioss_evts, pss_evtmap,
	ioss_evtmap);
	}
	EXPORT_SYMBOL_GPL(telemetry_add_events);

	/**
	* telemetry_read_events() - Fetches samples as specified by evtlog.telem_evt_id
	* @telem_unit: Specify whether IOSS or PSS Read
	* @evtlog: Array of telemetry_evtlog structs to fill data
	* evtlog.telem_evt_id specifies the ids to read
	* @len: Length of array of evtlog
	*
	* Return: number of eventlogs read for success, < 0 for failure
	*/
	int telemetry_read_events(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog, int len)
	{
	return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
	len, 0);
	}
	EXPORT_SYMBOL_GPL(telemetry_read_events);

	/**
	* telemetry_raw_read_events() - Fetch samples specified by evtlog.telem_evt_id
	* @telem_unit: Specify whether IOSS or PSS Read
	* @evtlog: Array of telemetry_evtlog structs to fill data
	* evtlog.telem_evt_id specifies the ids to read
	* @len: Length of array of evtlog
	*
	* The caller must take care of locking in this case.
	*
	* Return: number of eventlogs read for success, < 0 for failure
	*/
	int telemetry_raw_read_events(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog, int len)
	{
	return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
	len, 0);
	}
	EXPORT_SYMBOL_GPL(telemetry_raw_read_events);

	/**
	* telemetry_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
	* @telem_unit: Specify whether IOSS or PSS Read
	* @evtlog: Array of telemetry_evtlog structs to fill data
	* @len: Length of array of evtlog
	*
	* Return: number of eventlogs read for success, < 0 for failure
	*/
	int telemetry_read_eventlog(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog, int len)
	{
	return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
	len, 1);
	}
	EXPORT_SYMBOL_GPL(telemetry_read_eventlog);

	/**
	* telemetry_raw_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
	* @telem_unit: Specify whether IOSS or PSS Read
	* @evtlog: Array of telemetry_evtlog structs to fill data
	* @len: Length of array of evtlog
	*
	* The caller must take care of locking in this case.
	*
	* Return: number of eventlogs read for success, < 0 for failure
	*/
	int telemetry_raw_read_eventlog(enum telemetry_unit telem_unit,
	struct telemetry_evtlog *evtlog, int len)
	{
	return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
	len, 1);
	}
	EXPORT_SYMBOL_GPL(telemetry_raw_read_eventlog);


	/**
	* telemetry_get_trace_verbosity() - Get the IOSS & PSS Trace verbosity
	* @telem_unit: Specify whether IOSS or PSS Read
	* @verbosity: Pointer to return Verbosity
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_get_trace_verbosity(enum telemetry_unit telem_unit,
	u32 *verbosity)
	{
	return telm_core_conf.telem_ops->get_trace_verbosity(telem_unit,
	verbosity);
	}
	EXPORT_SYMBOL_GPL(telemetry_get_trace_verbosity);


	/**
	* telemetry_set_trace_verbosity() - Update the IOSS & PSS Trace verbosity
	* @telem_unit: Specify whether IOSS or PSS Read
	* @verbosity: Verbosity to set
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_set_trace_verbosity(enum telemetry_unit telem_unit, u32 verbosity)
	{
	return telm_core_conf.telem_ops->set_trace_verbosity(telem_unit,
	verbosity);
	}
	EXPORT_SYMBOL_GPL(telemetry_set_trace_verbosity);

	/**
	* telemetry_set_pltdata() - Set the platform specific Data
	* @ops: Pointer to ops structure
	* @pltconfig: Platform config data
	*
	* Usage by other than telemetry pltdrv module is invalid
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_set_pltdata(const struct telemetry_core_ops *ops,
	struct telemetry_plt_config *pltconfig)
	{
	if (ops)
	telm_core_conf.telem_ops = ops;

	if (pltconfig)
	telm_core_conf.plt_config = pltconfig;

	return 0;
	}
	EXPORT_SYMBOL_GPL(telemetry_set_pltdata);

	/**
	* telemetry_clear_pltdata() - Clear the platform specific Data
	*
	* Usage by other than telemetry pltdrv module is invalid
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_clear_pltdata(void)
	{
	telm_core_conf.telem_ops = &telm_defpltops;
	telm_core_conf.plt_config = NULL;

	return 0;
	}
	EXPORT_SYMBOL_GPL(telemetry_clear_pltdata);

	/**
	* telemetry_pltconfig_valid() - Checkif platform config is valid
	*
	* Usage by other than telemetry module is invalid
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_pltconfig_valid(void)
	{
	if (telm_core_conf.plt_config)
	return 0;

	else
	return -EINVAL;
	}
	EXPORT_SYMBOL_GPL(telemetry_pltconfig_valid);

	static inline int telemetry_get_pssevtname(enum telemetry_unit telem_unit,
	const char **name, int len)
	{
	struct telemetry_unit_config psscfg;
	int i;

	if (!telm_core_conf.plt_config)
	return -EINVAL;

	psscfg = telm_core_conf.plt_config->pss_config;

	if (len > psscfg.ssram_evts_used)
	len = psscfg.ssram_evts_used;

	for (i = 0; i < len; i++)
	name[i] = psscfg.telem_evts[i].name;

	return 0;
	}

	static inline int telemetry_get_iossevtname(enum telemetry_unit telem_unit,
	const char **name, int len)
	{
	struct telemetry_unit_config iosscfg;
	int i;

	if (!(telm_core_conf.plt_config))
	return -EINVAL;

	iosscfg = telm_core_conf.plt_config->ioss_config;

	if (len > iosscfg.ssram_evts_used)
	len = iosscfg.ssram_evts_used;

	for (i = 0; i < len; i++)
	name[i] = iosscfg.telem_evts[i].name;

	return 0;

	}

	/**
	* telemetry_get_evtname() - Checkif platform config is valid
	* @telem_unit: Telemetry Unit to check
	* @name: Array of character pointers to contain name
	* @len: length of array name provided by user
	*
	* Usage by other than telemetry debugfs module is invalid
	*
	* Return: 0 success, < 0 for failure
	*/
	int telemetry_get_evtname(enum telemetry_unit telem_unit,
	const char **name, int len)
	{
	int ret = -EINVAL;

	if (telem_unit == TELEM_PSS)
	ret = telemetry_get_pssevtname(telem_unit, name, len);

	else if (telem_unit == TELEM_IOSS)
	ret = telemetry_get_iossevtname(telem_unit, name, len);

	return ret;
	}
	EXPORT_SYMBOL_GPL(telemetry_get_evtname);

	static int __init telemetry_module_init(void)
	{
	pr_info(pr_fmt(DRIVER_NAME) " Init\n");

	telm_core_conf.telem_ops = &telm_defpltops;
	return 0;
	}

	static void __exit telemetry_module_exit(void)
	{
	}

	module_init(telemetry_module_init);
	module_exit(telemetry_module_exit);

	MODULE_AUTHOR("Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>");
	MODULE_DESCRIPTION("Intel SoC Telemetry Interface");
	MODULE_LICENSE("GPL");