arch/arm/mach-msm/rpm_rbcpr_stats.c - kernel/msm - Gitiles

 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that 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.
  *
  */

 #include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/spinlock.h>
 #include <linux/sort.h>
 #include <asm/uaccess.h>
 #include <mach/msm_iomap.h>
 #include "timer.h"
 #include "rpm_rbcpr_stats.h"

 #define RBCPR_USER_BUF		(2000)
 #define STR(a)  (#a)
 #define GETFIELD(a)     ((strnstr(STR(a), "->", 80) + 2))
 #define PRINTFIELD(buf, buf_size, pos, format, ...) \
 	((pos < buf_size) ? snprintf((buf + pos), (buf_size - pos), format,\
 		## __VA_ARGS__) : 0)

 enum {
 	RBCPR_CORNER_SVS = 0,
 	RBCPR_CORNER_NOMINAL,
 	RBCPR_CORNER_TURBO,
 	RBCPR_CORNERS_COUNT,
 	RBCPR_CORNER_INVALID = 0x7FFFFFFF,
 };

 struct msm_rpmrbcpr_recmnd {
 	uint32_t voltage;
 	uint32_t timestamp;
 };

 struct msm_rpmrbcpr_corners {
 	int efuse_adjustment;
 	struct msm_rpmrbcpr_recmnd *rpm_rcmnd;
 	uint32_t programmed_voltage;
 	uint32_t isr_counter;
 	uint32_t min_counter;
 	uint32_t max_counter;
 };

 struct msm_rpmrbcpr_stats {
 	uint32_t status_count;
 	uint32_t num_corners;
 	uint32_t num_latest_recommends;
 	struct msm_rpmrbcpr_corners *rbcpr_corners;
 	uint32_t current_corner;
 	uint32_t railway_voltage;
 	uint32_t enable;
 };

 struct msm_rpmrbcpr_stats_internal {
 	void __iomem *regbase;
 	uint32_t len;
 	char buf[RBCPR_USER_BUF];
 };

 static DEFINE_SPINLOCK(rpm_rbcpr_lock);
 static struct msm_rpmrbcpr_design_data rbcpr_design_data;
 static struct msm_rpmrbcpr_stats rbcpr_stats;
 static struct msm_rpmrbcpr_stats_internal pvtdata;

 static inline unsigned long msm_rpmrbcpr_read_data(void __iomem *regbase,
 						int offset)
 {
 	return readl_relaxed(regbase + (offset * 4));
 }

 static int msm_rpmrbcpr_cmp_func(const void *a, const void *b)
 {
 	struct msm_rpmrbcpr_recmnd *pa = (struct msm_rpmrbcpr_recmnd *)(a);
 	struct msm_rpmrbcpr_recmnd *pb = (struct msm_rpmrbcpr_recmnd *)(b);
 	return pa->timestamp - pb->timestamp;
 }

 static char *msm_rpmrbcpr_corner_string(uint32_t corner)
 {
 	switch (corner) {
 	case RBCPR_CORNER_SVS:
 		return STR(RBCPR_CORNER_SVS);
 		break;
 	case RBCPR_CORNER_NOMINAL:
 		return STR(RBCPR_CORNER_NOMINAL);
 		break;
 	case RBCPR_CORNER_TURBO:
 		return STR(RBCPR_CORNER_TURBO);
 		break;
 	case RBCPR_CORNERS_COUNT:
 	case RBCPR_CORNER_INVALID:
 	default:
 		return STR(RBCPR_CORNER_INVALID);
 		break;
 	}
 }

 static int msm_rpmrbcpr_print_buf(struct msm_rpmrbcpr_stats *pdata,
 				struct msm_rpmrbcpr_design_data *pdesdata,
 				char *buf)
 {
 	int pos = 0;
 	struct msm_rpmrbcpr_corners *corners;
 	struct msm_rpmrbcpr_recmnd *rcmnd;
 	int i, j;
 	int current_timestamp = msm_timer_get_sclk_ticks();

 	if (!pdata->enable) {
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 				"RBCPR Stats not enabled at RPM");
 		return pos;
 	}

 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 				":RBCPR Platform Data");
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %u)", GETFIELD(pdesdata->upside_steps),
 				pdesdata->upside_steps);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s:%u)", GETFIELD(pdesdata->downside_steps),
 				pdesdata->downside_steps);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %d)", GETFIELD(pdesdata->svs_voltage),
 				pdesdata->svs_voltage);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %d)", GETFIELD(pdesdata->nominal_voltage),
 				pdesdata->nominal_voltage);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %d)\n", GETFIELD(pdesdata->turbo_voltage),
 				pdesdata->turbo_voltage);

 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 				":RBCPR Stats");
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %u)", GETFIELD(pdata->status_counter),
 				pdata->status_count);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %s)", GETFIELD(pdata->current_corner),
 			msm_rpmrbcpr_corner_string(pdata->current_corner));
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (current_timestamp: 0x%x)",
 				current_timestamp);
 	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 		" (%s: %u)\n", GETFIELD(pdata->railway_voltage),
 			pdata->railway_voltage);

 	for (i = 0; i < pdata->num_corners; i++) {
 		corners = &pdata->rbcpr_corners[i];
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 				":\tRBCPR Corner Data");
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (name: %s)", msm_rpmrbcpr_corner_string(i));
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (%s: %d)", GETFIELD(corners->efuse_adjustment),
 			corners->efuse_adjustment);
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (%s: %u)", GETFIELD(corners->programmed_voltage),
 						corners->programmed_voltage);
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (%s: %u)", GETFIELD(corners->isr_counter),
 						corners->isr_counter);
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			"(%s: %u)", GETFIELD(corners->min_counter),
 						corners->min_counter);
 		pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			"(%s:%u)\n", GETFIELD(corners->max_counter),
 						corners->max_counter);
 		for (j = 0; j < pdata->num_latest_recommends; j++) {
 			pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 				":\t\tVoltage History[%d]", j);
 			rcmnd = &corners->rpm_rcmnd[j];
 			pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (%s: %u)", GETFIELD(rcmnd->voltage),
 							rcmnd->voltage);
 			pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
 			" (%s: 0x%x)\n", GETFIELD(rcmnd->timestamp),
 							rcmnd->timestamp);
 		}
 	}
 	return pos;
 }


 static void msm_rpmrbcpr_copy_data(struct msm_rpmrbcpr_stats_internal *pdata,
 					struct msm_rpmrbcpr_stats *prbcpr_stats)
 {
 	struct msm_rpmrbcpr_corners *corners;
 	struct msm_rpmrbcpr_recmnd *rcmnd;
 	int i, j;
 	int offset = (offsetof(struct msm_rpmrbcpr_stats, rbcpr_corners) / 4);

 	if (!prbcpr_stats)
 		return;

 	for (i = 0; i < prbcpr_stats->num_corners; i++) {
 		corners = &prbcpr_stats->rbcpr_corners[i];
 		corners->efuse_adjustment = msm_rpmrbcpr_read_data(
 					pdata->regbase, offset++);
 		for (j = 0; j < prbcpr_stats->num_latest_recommends; j++) {
 			rcmnd = &corners->rpm_rcmnd[j];
 			rcmnd->voltage = msm_rpmrbcpr_read_data(
 					pdata->regbase, offset++);
 			rcmnd->timestamp = msm_rpmrbcpr_read_data(
 					pdata->regbase, offset++);
 		}
 		sort(&corners->rpm_rcmnd[0],
 			prbcpr_stats->num_latest_recommends,
 			sizeof(struct msm_rpmrbcpr_recmnd),
 			msm_rpmrbcpr_cmp_func, NULL);
 		corners->programmed_voltage = msm_rpmrbcpr_read_data(
 					pdata->regbase, offset++);
 		corners->isr_counter = msm_rpmrbcpr_read_data(pdata->regbase,
 					offset++);
 		corners->min_counter = msm_rpmrbcpr_read_data(pdata->regbase,
 					offset++);
 		corners->max_counter = msm_rpmrbcpr_read_data(pdata->regbase,
 					offset++);
 	}
 	prbcpr_stats->current_corner = msm_rpmrbcpr_read_data(pdata->regbase,
 					offset++);
 	prbcpr_stats->railway_voltage = msm_rpmrbcpr_read_data
 				(pdata->regbase, offset++);
 	prbcpr_stats->enable = msm_rpmrbcpr_read_data(pdata->regbase, offset++);
 }

 static int msm_rpmrbcpr_file_read(struct file *file, char __user *bufu,
 				size_t count, loff_t *ppos)
 {
 	struct msm_rpmrbcpr_stats_internal *pdata = file->private_data;
 	int ret;
 	int status_counter;

 	if (!pdata) {
 		pr_info("%s pdata is null", __func__);
 		return -EINVAL;
 	}

 	if (!bufu || count < 0) {
 		pr_info("%s count %d ", __func__, count);
 		return -EINVAL;
 	}

 	if (*ppos > pdata->len || !pdata->len) {
 		/* Read RPM stats */
 		status_counter = readl_relaxed(pdata->regbase +
 			offsetof(struct msm_rpmrbcpr_stats, status_count));
 		if (status_counter != rbcpr_stats.status_count) {
 			spin_lock(&rpm_rbcpr_lock);
 			msm_rpmrbcpr_copy_data(pdata, &rbcpr_stats);
 			rbcpr_stats.status_count = status_counter;
 			spin_unlock(&rpm_rbcpr_lock);
 		}
 		pdata->len = msm_rpmrbcpr_print_buf(&rbcpr_stats,
 				&rbcpr_design_data, pdata->buf);
 		*ppos = 0;
 	}
 	/* copy to user data */
 	ret = simple_read_from_buffer(bufu, count, ppos, pdata->buf,
 					pdata->len);
 	return ret;
 }

 static void msm_rpmrbcpr_free_mem(struct msm_rpmrbcpr_stats_internal *pvtdata,
 				struct msm_rpmrbcpr_stats *prbcpr_stats)
 {
 	int i;
 	if (pvtdata->regbase)
 		iounmap(pvtdata->regbase);


 	if (prbcpr_stats) {
 		for (i = 0; i < prbcpr_stats->num_corners; i++) {
 			kfree(prbcpr_stats->rbcpr_corners[i].rpm_rcmnd);
 			prbcpr_stats->rbcpr_corners[i].rpm_rcmnd = NULL;
 		}

 		kfree(prbcpr_stats->rbcpr_corners);
 		prbcpr_stats->rbcpr_corners = NULL;
 	}
 }

 static int msm_rpmrbcpr_allocate_mem(struct msm_rpmrbcpr_platform_data *pdata,
 				struct resource *res)
 {
 	int i;

 	pvtdata.regbase = ioremap(res->start, (res->end - res->start + 1));
 	memcpy(&rbcpr_design_data, &pdata->rbcpr_data,
 			sizeof(struct msm_rpmrbcpr_design_data));


 	rbcpr_stats.num_corners = readl_relaxed(pvtdata.regbase +
 			offsetof(struct msm_rpmrbcpr_stats, num_corners));
 	rbcpr_stats.num_latest_recommends = readl_relaxed(pvtdata.regbase +
 			offsetof(struct msm_rpmrbcpr_stats,
 				num_latest_recommends));

 	rbcpr_stats.rbcpr_corners = kzalloc(
 				sizeof(struct msm_rpmrbcpr_corners)
 				* rbcpr_stats.num_corners, GFP_KERNEL);

 	if (!rbcpr_stats.rbcpr_corners) {
 		msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
 		return -ENOMEM;
 	}

 	for (i = 0; i < rbcpr_stats.num_corners; i++) {
 		rbcpr_stats.rbcpr_corners[i].rpm_rcmnd =
 			kzalloc(sizeof(struct msm_rpmrbcpr_corners)
 				* rbcpr_stats.num_latest_recommends,
 							GFP_KERNEL);

 		if (!rbcpr_stats.rbcpr_corners[i].rpm_rcmnd) {
 			msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
 			return -ENOMEM;
 		}
 	}
 	return 0;
 }

 static int msm_rpmrbcpr_file_open(struct inode *inode, struct file *file)
 {
 	file->private_data = &pvtdata;
 	pvtdata.len = 0;

 	if (!pvtdata.regbase)
 		return -EBUSY;

 	return 0;
 }

 static int msm_rpmrbcpr_file_close(struct inode *inode, struct file *file)
 {
 	return 0;
 }

 static const struct file_operations msm_rpmrbcpr_fops = {
 	.owner    = THIS_MODULE,
 	.open     = msm_rpmrbcpr_file_open,
 	.read     = msm_rpmrbcpr_file_read,
 	.release  = msm_rpmrbcpr_file_close,
 	.llseek   = no_llseek,
 };

 static  int __devinit msm_rpmrbcpr_probe(struct platform_device *pdev)
 {
 	struct dentry *dent;
 	struct msm_rpmrbcpr_platform_data *pdata;
 	int ret = 0;

 	pdata = pdev->dev.platform_data;
 	if (!pdata)
 		return -EINVAL;
 	dent = debugfs_create_file("rpm_rbcpr", S_IRUGO, NULL,
 	pdev->dev.platform_data, &msm_rpmrbcpr_fops);

 	if (!dent) {
 		pr_err("%s: ERROR debugfs_create_file failed\n", __func__);
 		return -ENOMEM;
 	}
 	platform_set_drvdata(pdev, dent);
 	ret = msm_rpmrbcpr_allocate_mem(pdata, pdev->resource);
 	return ret;
 }

 static int __devexit msm_rpmrbcpr_remove(struct platform_device *pdev)
 {
 	struct dentry *dent;

 	msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
 	dent = platform_get_drvdata(pdev);
 	debugfs_remove(dent);
 	platform_set_drvdata(pdev, NULL);
 	return 0;
 }

 static struct platform_driver msm_rpmrbcpr_driver = {
 	.probe  = msm_rpmrbcpr_probe,
 	.remove = __devexit_p(msm_rpmrbcpr_remove),
 	.driver = {
 		.name = "msm_rpm_rbcpr",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init msm_rpmrbcpr_init(void)
 {
 	return platform_driver_register(&msm_rpmrbcpr_driver);
 }

 static void __exit msm_rpmrbcpr_exit(void)
 {
 	platform_driver_unregister(&msm_rpmrbcpr_driver);
 }

 module_init(msm_rpmrbcpr_init);
 module_exit(msm_rpmrbcpr_exit);
	/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that 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.
	*
	*/

	#include <linux/debugfs.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/mm.h>
	#include <linux/spinlock.h>
	#include <linux/sort.h>
	#include <asm/uaccess.h>
	#include <mach/msm_iomap.h>
	#include "timer.h"
	#include "rpm_rbcpr_stats.h"

	#define RBCPR_USER_BUF (2000)
	#define STR(a) (#a)
	#define GETFIELD(a) ((strnstr(STR(a), "->", 80) + 2))
	#define PRINTFIELD(buf, buf_size, pos, format, ...) \
	((pos < buf_size) ? snprintf((buf + pos), (buf_size - pos), format,\
	## __VA_ARGS__) : 0)

	enum {
	RBCPR_CORNER_SVS = 0,
	RBCPR_CORNER_NOMINAL,
	RBCPR_CORNER_TURBO,
	RBCPR_CORNERS_COUNT,
	RBCPR_CORNER_INVALID = 0x7FFFFFFF,
	};

	struct msm_rpmrbcpr_recmnd {
	uint32_t voltage;
	uint32_t timestamp;
	};

	struct msm_rpmrbcpr_corners {
	int efuse_adjustment;
	struct msm_rpmrbcpr_recmnd *rpm_rcmnd;
	uint32_t programmed_voltage;
	uint32_t isr_counter;
	uint32_t min_counter;
	uint32_t max_counter;
	};

	struct msm_rpmrbcpr_stats {
	uint32_t status_count;
	uint32_t num_corners;
	uint32_t num_latest_recommends;
	struct msm_rpmrbcpr_corners *rbcpr_corners;
	uint32_t current_corner;
	uint32_t railway_voltage;
	uint32_t enable;
	};

	struct msm_rpmrbcpr_stats_internal {
	void __iomem *regbase;
	uint32_t len;
	char buf[RBCPR_USER_BUF];
	};

	static DEFINE_SPINLOCK(rpm_rbcpr_lock);
	static struct msm_rpmrbcpr_design_data rbcpr_design_data;
	static struct msm_rpmrbcpr_stats rbcpr_stats;
	static struct msm_rpmrbcpr_stats_internal pvtdata;

	static inline unsigned long msm_rpmrbcpr_read_data(void __iomem *regbase,
	int offset)
	{
	return readl_relaxed(regbase + (offset * 4));
	}

	static int msm_rpmrbcpr_cmp_func(const void a, const void b)
	{
	struct msm_rpmrbcpr_recmnd pa = (struct msm_rpmrbcpr_recmnd )(a);
	struct msm_rpmrbcpr_recmnd pb = (struct msm_rpmrbcpr_recmnd )(b);
	return pa->timestamp - pb->timestamp;
	}

	static char *msm_rpmrbcpr_corner_string(uint32_t corner)
	{
	switch (corner) {
	case RBCPR_CORNER_SVS:
	return STR(RBCPR_CORNER_SVS);
	break;
	case RBCPR_CORNER_NOMINAL:
	return STR(RBCPR_CORNER_NOMINAL);
	break;
	case RBCPR_CORNER_TURBO:
	return STR(RBCPR_CORNER_TURBO);
	break;
	case RBCPR_CORNERS_COUNT:
	case RBCPR_CORNER_INVALID:
	default:
	return STR(RBCPR_CORNER_INVALID);
	break;
	}
	}

	static int msm_rpmrbcpr_print_buf(struct msm_rpmrbcpr_stats *pdata,
	struct msm_rpmrbcpr_design_data *pdesdata,
	char *buf)
	{
	int pos = 0;
	struct msm_rpmrbcpr_corners *corners;
	struct msm_rpmrbcpr_recmnd *rcmnd;
	int i, j;
	int current_timestamp = msm_timer_get_sclk_ticks();

	if (!pdata->enable) {
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	"RBCPR Stats not enabled at RPM");
	return pos;
	}

	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	":RBCPR Platform Data");
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)", GETFIELD(pdesdata->upside_steps),
	pdesdata->upside_steps);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s:%u)", GETFIELD(pdesdata->downside_steps),
	pdesdata->downside_steps);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %d)", GETFIELD(pdesdata->svs_voltage),
	pdesdata->svs_voltage);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %d)", GETFIELD(pdesdata->nominal_voltage),
	pdesdata->nominal_voltage);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %d)\n", GETFIELD(pdesdata->turbo_voltage),
	pdesdata->turbo_voltage);

	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	":RBCPR Stats");
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)", GETFIELD(pdata->status_counter),
	pdata->status_count);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %s)", GETFIELD(pdata->current_corner),
	msm_rpmrbcpr_corner_string(pdata->current_corner));
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (current_timestamp: 0x%x)",
	current_timestamp);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)\n", GETFIELD(pdata->railway_voltage),
	pdata->railway_voltage);

	for (i = 0; i < pdata->num_corners; i++) {
	corners = &pdata->rbcpr_corners[i];
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	":\tRBCPR Corner Data");
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (name: %s)", msm_rpmrbcpr_corner_string(i));
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %d)", GETFIELD(corners->efuse_adjustment),
	corners->efuse_adjustment);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)", GETFIELD(corners->programmed_voltage),
	corners->programmed_voltage);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)", GETFIELD(corners->isr_counter),
	corners->isr_counter);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	"(%s: %u)", GETFIELD(corners->min_counter),
	corners->min_counter);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	"(%s:%u)\n", GETFIELD(corners->max_counter),
	corners->max_counter);
	for (j = 0; j < pdata->num_latest_recommends; j++) {
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	":\t\tVoltage History[%d]", j);
	rcmnd = &corners->rpm_rcmnd[j];
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: %u)", GETFIELD(rcmnd->voltage),
	rcmnd->voltage);
	pos += PRINTFIELD(buf, RBCPR_USER_BUF, pos,
	" (%s: 0x%x)\n", GETFIELD(rcmnd->timestamp),
	rcmnd->timestamp);
	}
	}
	return pos;
	}


	static void msm_rpmrbcpr_copy_data(struct msm_rpmrbcpr_stats_internal *pdata,
	struct msm_rpmrbcpr_stats *prbcpr_stats)
	{
	struct msm_rpmrbcpr_corners *corners;
	struct msm_rpmrbcpr_recmnd *rcmnd;
	int i, j;
	int offset = (offsetof(struct msm_rpmrbcpr_stats, rbcpr_corners) / 4);

	if (!prbcpr_stats)
	return;

	for (i = 0; i < prbcpr_stats->num_corners; i++) {
	corners = &prbcpr_stats->rbcpr_corners[i];
	corners->efuse_adjustment = msm_rpmrbcpr_read_data(
	pdata->regbase, offset++);
	for (j = 0; j < prbcpr_stats->num_latest_recommends; j++) {
	rcmnd = &corners->rpm_rcmnd[j];
	rcmnd->voltage = msm_rpmrbcpr_read_data(
	pdata->regbase, offset++);
	rcmnd->timestamp = msm_rpmrbcpr_read_data(
	pdata->regbase, offset++);
	}
	sort(&corners->rpm_rcmnd[0],
	prbcpr_stats->num_latest_recommends,
	sizeof(struct msm_rpmrbcpr_recmnd),
	msm_rpmrbcpr_cmp_func, NULL);
	corners->programmed_voltage = msm_rpmrbcpr_read_data(
	pdata->regbase, offset++);
	corners->isr_counter = msm_rpmrbcpr_read_data(pdata->regbase,
	offset++);
	corners->min_counter = msm_rpmrbcpr_read_data(pdata->regbase,
	offset++);
	corners->max_counter = msm_rpmrbcpr_read_data(pdata->regbase,
	offset++);
	}
	prbcpr_stats->current_corner = msm_rpmrbcpr_read_data(pdata->regbase,
	offset++);
	prbcpr_stats->railway_voltage = msm_rpmrbcpr_read_data
	(pdata->regbase, offset++);
	prbcpr_stats->enable = msm_rpmrbcpr_read_data(pdata->regbase, offset++);
	}

	static int msm_rpmrbcpr_file_read(struct file file, char __user bufu,
	size_t count, loff_t *ppos)
	{
	struct msm_rpmrbcpr_stats_internal *pdata = file->private_data;
	int ret;
	int status_counter;

	if (!pdata) {
	pr_info("%s pdata is null", __func__);
	return -EINVAL;
	}

	if (!bufu \|\| count < 0) {
	pr_info("%s count %d ", __func__, count);
	return -EINVAL;
	}

	if (*ppos > pdata->len \|\| !pdata->len) {
	/* Read RPM stats */
	status_counter = readl_relaxed(pdata->regbase +
	offsetof(struct msm_rpmrbcpr_stats, status_count));
	if (status_counter != rbcpr_stats.status_count) {
	spin_lock(&rpm_rbcpr_lock);
	msm_rpmrbcpr_copy_data(pdata, &rbcpr_stats);
	rbcpr_stats.status_count = status_counter;
	spin_unlock(&rpm_rbcpr_lock);
	}
	pdata->len = msm_rpmrbcpr_print_buf(&rbcpr_stats,
	&rbcpr_design_data, pdata->buf);
	*ppos = 0;
	}
	/* copy to user data */
	ret = simple_read_from_buffer(bufu, count, ppos, pdata->buf,
	pdata->len);
	return ret;
	}

	static void msm_rpmrbcpr_free_mem(struct msm_rpmrbcpr_stats_internal *pvtdata,
	struct msm_rpmrbcpr_stats *prbcpr_stats)
	{
	int i;
	if (pvtdata->regbase)
	iounmap(pvtdata->regbase);


	if (prbcpr_stats) {
	for (i = 0; i < prbcpr_stats->num_corners; i++) {
	kfree(prbcpr_stats->rbcpr_corners[i].rpm_rcmnd);
	prbcpr_stats->rbcpr_corners[i].rpm_rcmnd = NULL;
	}

	kfree(prbcpr_stats->rbcpr_corners);
	prbcpr_stats->rbcpr_corners = NULL;
	}
	}

	static int msm_rpmrbcpr_allocate_mem(struct msm_rpmrbcpr_platform_data *pdata,
	struct resource *res)
	{
	int i;

	pvtdata.regbase = ioremap(res->start, (res->end - res->start + 1));
	memcpy(&rbcpr_design_data, &pdata->rbcpr_data,
	sizeof(struct msm_rpmrbcpr_design_data));


	rbcpr_stats.num_corners = readl_relaxed(pvtdata.regbase +
	offsetof(struct msm_rpmrbcpr_stats, num_corners));
	rbcpr_stats.num_latest_recommends = readl_relaxed(pvtdata.regbase +
	offsetof(struct msm_rpmrbcpr_stats,
	num_latest_recommends));

	rbcpr_stats.rbcpr_corners = kzalloc(
	sizeof(struct msm_rpmrbcpr_corners)
	* rbcpr_stats.num_corners, GFP_KERNEL);

	if (!rbcpr_stats.rbcpr_corners) {
	msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
	return -ENOMEM;
	}

	for (i = 0; i < rbcpr_stats.num_corners; i++) {
	rbcpr_stats.rbcpr_corners[i].rpm_rcmnd =
	kzalloc(sizeof(struct msm_rpmrbcpr_corners)
	* rbcpr_stats.num_latest_recommends,
	GFP_KERNEL);

	if (!rbcpr_stats.rbcpr_corners[i].rpm_rcmnd) {
	msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
	return -ENOMEM;
	}
	}
	return 0;
	}

	static int msm_rpmrbcpr_file_open(struct inode inode, struct file file)
	{
	file->private_data = &pvtdata;
	pvtdata.len = 0;

	if (!pvtdata.regbase)
	return -EBUSY;

	return 0;
	}

	static int msm_rpmrbcpr_file_close(struct inode inode, struct file file)
	{
	return 0;
	}

	static const struct file_operations msm_rpmrbcpr_fops = {
	.owner = THIS_MODULE,
	.open = msm_rpmrbcpr_file_open,
	.read = msm_rpmrbcpr_file_read,
	.release = msm_rpmrbcpr_file_close,
	.llseek = no_llseek,
	};

	static int __devinit msm_rpmrbcpr_probe(struct platform_device *pdev)
	{
	struct dentry *dent;
	struct msm_rpmrbcpr_platform_data *pdata;
	int ret = 0;

	pdata = pdev->dev.platform_data;
	if (!pdata)
	return -EINVAL;
	dent = debugfs_create_file("rpm_rbcpr", S_IRUGO, NULL,
	pdev->dev.platform_data, &msm_rpmrbcpr_fops);

	if (!dent) {
	pr_err("%s: ERROR debugfs_create_file failed\n", __func__);
	return -ENOMEM;
	}
	platform_set_drvdata(pdev, dent);
	ret = msm_rpmrbcpr_allocate_mem(pdata, pdev->resource);
	return ret;
	}

	static int __devexit msm_rpmrbcpr_remove(struct platform_device *pdev)
	{
	struct dentry *dent;

	msm_rpmrbcpr_free_mem(&pvtdata, &rbcpr_stats);
	dent = platform_get_drvdata(pdev);
	debugfs_remove(dent);
	platform_set_drvdata(pdev, NULL);
	return 0;
	}

	static struct platform_driver msm_rpmrbcpr_driver = {
	.probe = msm_rpmrbcpr_probe,
	.remove = __devexit_p(msm_rpmrbcpr_remove),
	.driver = {
	.name = "msm_rpm_rbcpr",
	.owner = THIS_MODULE,
	},
	};

	static int __init msm_rpmrbcpr_init(void)
	{
	return platform_driver_register(&msm_rpmrbcpr_driver);
	}

	static void __exit msm_rpmrbcpr_exit(void)
	{
	platform_driver_unregister(&msm_rpmrbcpr_driver);
	}

	module_init(msm_rpmrbcpr_init);
	module_exit(msm_rpmrbcpr_exit);