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

 /* Copyright (c) 2012-2013, 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/of.h>
 #include <asm/uaccess.h>

 #include <mach/msm_iomap.h>
 #include "rpm_stats.h"

 #define RPM_MASTERS_BUF_LEN 400

 #define SNPRINTF(buf, size, format, ...) \
 	do { \
 		if (size > 0) { \
 			int ret; \
 			ret = snprintf(buf, size, format, ## __VA_ARGS__); \
 			if (ret > size) { \
 				buf += size; \
 				size = 0; \
 			} else { \
 				buf += ret; \
 				size -= ret; \
 			} \
 		} \
 	} while (0)

 #define GET_MASTER_NAME(a, prvdata) \
 	((a >= prvdata->num_masters) ? "Invalid Master Name" : \
 	 prvdata->master_names[a])

 #define GET_FIELD(a) ((strnstr(#a, ".", 80) + 1))

 struct msm_rpm_master_stats {
 	uint32_t active_cores;
 	uint32_t numshutdowns;
 	uint64_t shutdown_req;
 	uint64_t wakeup_ind;
 	uint64_t bringup_req;
 	uint64_t bringup_ack;
 	uint32_t wakeup_reason; /* 0 = rude wakeup, 1 = scheduled wakeup */
 	uint32_t last_sleep_transition_duration;
 	uint32_t last_wake_transition_duration;
 };

 struct msm_rpm_master_stats_private_data {
 	void __iomem *reg_base;
 	u32 len;
 	char **master_names;
 	u32 num_masters;
 	char buf[RPM_MASTERS_BUF_LEN];
 	struct msm_rpm_master_stats_platform_data *platform_data;
 };

 int msm_rpm_master_stats_file_close(struct inode *inode,
 		struct file *file)
 {
 	struct msm_rpm_master_stats_private_data *private = file->private_data;

 	if (private->reg_base)
 		iounmap(private->reg_base);
 	kfree(file->private_data);

 	return 0;
 }

 static int msm_rpm_master_copy_stats(
 		struct msm_rpm_master_stats_private_data *prvdata)
 {
 	struct msm_rpm_master_stats record;
 	struct msm_rpm_master_stats_platform_data *pdata;
 	static int master_cnt;
 	int count, j = 0;
 	char *buf;
 	static DEFINE_MUTEX(msm_rpm_master_stats_mutex);

 	mutex_lock(&msm_rpm_master_stats_mutex);

 	/* Iterate possible number of masters */
 	if (master_cnt > prvdata->num_masters - 1) {
 		master_cnt = 0;
 		mutex_unlock(&msm_rpm_master_stats_mutex);
 		return 0;
 	}

 	pdata = prvdata->platform_data;
 	count = RPM_MASTERS_BUF_LEN;
 	buf = prvdata->buf;

 	if (prvdata->platform_data->version == 2) {
 		SNPRINTF(buf, count, "%s\n",
 				GET_MASTER_NAME(master_cnt, prvdata));

 		record.shutdown_req = readll_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset +
 			offsetof(struct msm_rpm_master_stats, shutdown_req)));

 		SNPRINTF(buf, count, "\t%s:0x%llX\n",
 			GET_FIELD(record.shutdown_req),
 			record.shutdown_req);

 		record.wakeup_ind = readll_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset +
 			offsetof(struct msm_rpm_master_stats, wakeup_ind)));

 		SNPRINTF(buf, count, "\t%s:0x%llX\n",
 			GET_FIELD(record.wakeup_ind),
 			record.wakeup_ind);

 		record.bringup_req = readll_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset +
 			offsetof(struct msm_rpm_master_stats, bringup_req)));

 		SNPRINTF(buf, count, "\t%s:0x%llX\n",
 			GET_FIELD(record.bringup_req),
 			record.bringup_req);

 		record.bringup_ack = readll_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset +
 			offsetof(struct msm_rpm_master_stats, bringup_ack)));

 		SNPRINTF(buf, count, "\t%s:0x%llX\n",
 			GET_FIELD(record.bringup_ack),
 			record.bringup_ack);

 		record.last_sleep_transition_duration =
 				readl_relaxed(prvdata->reg_base +
 				(master_cnt * pdata->master_offset +
 				offsetof(struct msm_rpm_master_stats,
 				last_sleep_transition_duration)));

 		SNPRINTF(buf, count, "\t%s:0x%x\n",
 			GET_FIELD(record.last_sleep_transition_duration),
 			record.last_sleep_transition_duration);

 		record.last_wake_transition_duration =
 				readl_relaxed(prvdata->reg_base +
 				(master_cnt * pdata->master_offset +
 				offsetof(struct msm_rpm_master_stats,
 				last_wake_transition_duration)));

 		SNPRINTF(buf, count, "\t%s:0x%x\n",
 			GET_FIELD(record.last_wake_transition_duration),
 			record.last_wake_transition_duration);

 		record.wakeup_reason = readl_relaxed(prvdata->reg_base +
 					(master_cnt * pdata->master_offset +
 					offsetof(struct msm_rpm_master_stats,
 					wakeup_reason)));

 		SNPRINTF(buf, count, "\t%s:0x%x\n",
 			GET_FIELD(record.wakeup_reason),
 			record.wakeup_reason);

 		record.numshutdowns = readl_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset +
 			 offsetof(struct msm_rpm_master_stats, numshutdowns)));

 		SNPRINTF(buf, count, "\t%s:0x%x\n",
 			GET_FIELD(record.numshutdowns),
 			record.numshutdowns);

 		record.active_cores = readl_relaxed(prvdata->reg_base +
 			(master_cnt * pdata->master_offset) +
 			offsetof(struct msm_rpm_master_stats, active_cores));

 		SNPRINTF(buf, count, "\t%s:0x%x\n",
 			GET_FIELD(record.active_cores),
 			record.active_cores);
 	} else {
 		SNPRINTF(buf, count, "%s\n",
 				GET_MASTER_NAME(master_cnt, prvdata));

 		record.numshutdowns = readl_relaxed(prvdata->reg_base +
 				(master_cnt * pdata->master_offset) + 0x0);

 		SNPRINTF(buf, count, "\t%s:0x%0x\n",
 			GET_FIELD(record.numshutdowns),
 			record.numshutdowns);

 		record.active_cores = readl_relaxed(prvdata->reg_base +
 				(master_cnt * pdata->master_offset) + 0x4);

 		SNPRINTF(buf, count, "\t%s:0x%0x\n",
 			GET_FIELD(record.active_cores),
 			record.active_cores);
 	}

 	j = find_first_bit((unsigned long *)&record.active_cores,
 							BITS_PER_LONG);
 	while (j < BITS_PER_LONG) {
 		SNPRINTF(buf, count, "\t\tcore%d\n", j);
 		j = find_next_bit((unsigned long *)&record.active_cores,
 				BITS_PER_LONG, j + 1);
 	}

 	master_cnt++;
 	mutex_unlock(&msm_rpm_master_stats_mutex);
 	return RPM_MASTERS_BUF_LEN - count;
 }

 static int msm_rpm_master_stats_file_read(struct file *file, char __user *bufu,
 				  size_t count, loff_t *ppos)
 {
 	struct msm_rpm_master_stats_private_data *prvdata;
 	struct msm_rpm_master_stats_platform_data *pdata;

 	prvdata = file->private_data;
 	if (!prvdata)
 		return -EINVAL;

 	pdata = prvdata->platform_data;
 	if (!pdata)
 		return -EINVAL;

 	if (!bufu || count == 0)
 		return -EINVAL;

 	if ((*ppos <= pdata->phys_size)) {
 		prvdata->len = msm_rpm_master_copy_stats(prvdata);
 		*ppos = 0;
 	}

 	return simple_read_from_buffer(bufu, count, ppos,
 			prvdata->buf, prvdata->len);
 }

 static int msm_rpm_master_stats_file_open(struct inode *inode,
 		struct file *file)
 {
 	struct msm_rpm_master_stats_private_data *prvdata;
 	struct msm_rpm_master_stats_platform_data *pdata;

 	pdata = inode->i_private;

 	file->private_data =
 		kzalloc(sizeof(struct msm_rpm_master_stats_private_data),
 			GFP_KERNEL);

 	if (!file->private_data)
 		return -ENOMEM;
 	prvdata = file->private_data;

 	prvdata->reg_base = ioremap(pdata->phys_addr_base,
 						pdata->phys_size);
 	if (!prvdata->reg_base) {
 		kfree(file->private_data);
 		prvdata = NULL;
 		pr_err("%s: ERROR could not ioremap start=%p, len=%u\n",
 			__func__, (void *)pdata->phys_addr_base,
 			pdata->phys_size);
 		return -EBUSY;
 	}

 	prvdata->len = 0;
 	prvdata->num_masters = pdata->num_masters;
 	prvdata->master_names = pdata->masters;
 	prvdata->platform_data = pdata;
 	return 0;
 }

 static const struct file_operations msm_rpm_master_stats_fops = {
 	.owner	  = THIS_MODULE,
 	.open	  = msm_rpm_master_stats_file_open,
 	.read	  = msm_rpm_master_stats_file_read,
 	.release  = msm_rpm_master_stats_file_close,
 	.llseek   = no_llseek,
 };

 static struct msm_rpm_master_stats_platform_data
 			*msm_rpm_master_populate_pdata(struct device *dev)
 {
 	struct msm_rpm_master_stats_platform_data *pdata;
 	struct device_node *node = dev->of_node;
 	int rc = 0, i;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata) {
 		dev_err(dev, "could not allocate memory for platform data\n");
 		goto err;
 	}

 	rc = of_property_read_u32(node, "qcom,master-stats-version",
 							&pdata->version);
 	if (rc) {
 		dev_err(dev, "master-stats-version missing rc=%d\n", rc);
 		goto err;
 	}

 	rc = of_property_read_u32(node, "qcom,master-offset",
 							&pdata->master_offset);
 	if (rc) {
 		dev_err(dev, "master-offset missing rc=%d\n", rc);
 		goto err;
 	}

 	pdata->num_masters = of_property_count_strings(node, "qcom,masters");
 	if (pdata->num_masters < 0) {
 		dev_err(dev, "Failed to get number of masters =%d\n",
 						pdata->num_masters);
 		goto err;
 	}

 	pdata->masters = devm_kzalloc(dev, sizeof(char *) * pdata->num_masters,
 								GFP_KERNEL);
 	if (!pdata->masters) {
 		dev_err(dev, "%s:Failed to allocated memory\n", __func__);
 		goto err;
 	}

 	/*
 	 * Read master names from DT
 	 */
 	for (i = 0; i < pdata->num_masters; i++) {
 		const char *master_name;
 		of_property_read_string_index(node, "qcom,masters",
 							i, &master_name);
 		pdata->masters[i] = devm_kzalloc(dev, sizeof(char) *
 				strlen(master_name) + 1, GFP_KERNEL);
 		if (!pdata->masters[i]) {
 			dev_err(dev, "%s:Failed to get memory\n", __func__);
 			goto err;
 		}
 		strlcpy(pdata->masters[i], master_name,
 					strlen(master_name) + 1);
 	}
 	return pdata;
 err:
 	return NULL;
 }

 static  int __devinit msm_rpm_master_stats_probe(struct platform_device *pdev)
 {
 	struct dentry *dent;
 	struct msm_rpm_master_stats_platform_data *pdata;
 	struct resource *res = NULL;

 	if (!pdev)
 		return -EINVAL;

 	if (pdev->dev.of_node)
 		pdata = msm_rpm_master_populate_pdata(&pdev->dev);
 	else
 		pdata = pdev->dev.platform_data;

 	if (!pdata) {
 		dev_err(&pdev->dev, "%s: Unable to get pdata\n", __func__);
 		return -ENOMEM;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

 	if (!res) {
 		dev_err(&pdev->dev,
 			"%s: Failed to get IO resource from platform device",
 			__func__);
 		return -ENXIO;
 	}

 	pdata->phys_addr_base = res->start;
 	pdata->phys_size = resource_size(res);

 	dent = debugfs_create_file("rpm_master_stats", S_IRUGO, NULL,
 					pdata, &msm_rpm_master_stats_fops);

 	if (!dent) {
 		dev_err(&pdev->dev, "%s: ERROR debugfs_create_file failed\n",
 								__func__);
 		return -ENOMEM;
 	}

 	platform_set_drvdata(pdev, dent);
 	return 0;
 }

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

 	dent = platform_get_drvdata(pdev);
 	debugfs_remove(dent);
 	platform_set_drvdata(pdev, NULL);
 	return 0;
 }

 static struct of_device_id rpm_master_table[] = {
 	{.compatible = "qcom,rpm-master-stats"},
 	{},
 };

 static struct platform_driver msm_rpm_master_stats_driver = {
 	.probe	= msm_rpm_master_stats_probe,
 	.remove = __devexit_p(msm_rpm_master_stats_remove),
 	.driver = {
 		.name = "msm_rpm_master_stats",
 		.owner = THIS_MODULE,
 		.of_match_table = rpm_master_table,
 	},
 };

 static int __init msm_rpm_master_stats_init(void)
 {
 	return platform_driver_register(&msm_rpm_master_stats_driver);
 }

 static void __exit msm_rpm_master_stats_exit(void)
 {
 	platform_driver_unregister(&msm_rpm_master_stats_driver);
 }

 module_init(msm_rpm_master_stats_init);
 module_exit(msm_rpm_master_stats_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("MSM RPM Master Statistics driver");
 MODULE_VERSION("1.0");
 MODULE_ALIAS("platform:msm_master_stat_log");
	/* Copyright (c) 2012-2013, 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/of.h>
	#include <asm/uaccess.h>

	#include <mach/msm_iomap.h>
	#include "rpm_stats.h"

	#define RPM_MASTERS_BUF_LEN 400

	#define SNPRINTF(buf, size, format, ...) \
	do { \
	if (size > 0) { \
	int ret; \
	ret = snprintf(buf, size, format, ## __VA_ARGS__); \
	if (ret > size) { \
	buf += size; \
	size = 0; \
	} else { \
	buf += ret; \
	size -= ret; \
	} \
	} \
	} while (0)

	#define GET_MASTER_NAME(a, prvdata) \
	((a >= prvdata->num_masters) ? "Invalid Master Name" : \
	prvdata->master_names[a])

	#define GET_FIELD(a) ((strnstr(#a, ".", 80) + 1))

	struct msm_rpm_master_stats {
	uint32_t active_cores;
	uint32_t numshutdowns;
	uint64_t shutdown_req;
	uint64_t wakeup_ind;
	uint64_t bringup_req;
	uint64_t bringup_ack;
	uint32_t wakeup_reason; /* 0 = rude wakeup, 1 = scheduled wakeup */
	uint32_t last_sleep_transition_duration;
	uint32_t last_wake_transition_duration;
	};

	struct msm_rpm_master_stats_private_data {
	void __iomem *reg_base;
	u32 len;
	char **master_names;
	u32 num_masters;
	char buf[RPM_MASTERS_BUF_LEN];
	struct msm_rpm_master_stats_platform_data *platform_data;
	};

	int msm_rpm_master_stats_file_close(struct inode *inode,
	struct file *file)
	{
	struct msm_rpm_master_stats_private_data *private = file->private_data;

	if (private->reg_base)
	iounmap(private->reg_base);
	kfree(file->private_data);

	return 0;
	}

	static int msm_rpm_master_copy_stats(
	struct msm_rpm_master_stats_private_data *prvdata)
	{
	struct msm_rpm_master_stats record;
	struct msm_rpm_master_stats_platform_data *pdata;
	static int master_cnt;
	int count, j = 0;
	char *buf;
	static DEFINE_MUTEX(msm_rpm_master_stats_mutex);

	mutex_lock(&msm_rpm_master_stats_mutex);

	/* Iterate possible number of masters */
	if (master_cnt > prvdata->num_masters - 1) {
	master_cnt = 0;
	mutex_unlock(&msm_rpm_master_stats_mutex);
	return 0;
	}

	pdata = prvdata->platform_data;
	count = RPM_MASTERS_BUF_LEN;
	buf = prvdata->buf;

	if (prvdata->platform_data->version == 2) {
	SNPRINTF(buf, count, "%s\n",
	GET_MASTER_NAME(master_cnt, prvdata));

	record.shutdown_req = readll_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats, shutdown_req)));

	SNPRINTF(buf, count, "\t%s:0x%llX\n",
	GET_FIELD(record.shutdown_req),
	record.shutdown_req);

	record.wakeup_ind = readll_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats, wakeup_ind)));

	SNPRINTF(buf, count, "\t%s:0x%llX\n",
	GET_FIELD(record.wakeup_ind),
	record.wakeup_ind);

	record.bringup_req = readll_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats, bringup_req)));

	SNPRINTF(buf, count, "\t%s:0x%llX\n",
	GET_FIELD(record.bringup_req),
	record.bringup_req);

	record.bringup_ack = readll_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats, bringup_ack)));

	SNPRINTF(buf, count, "\t%s:0x%llX\n",
	GET_FIELD(record.bringup_ack),
	record.bringup_ack);

	record.last_sleep_transition_duration =
	readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats,
	last_sleep_transition_duration)));

	SNPRINTF(buf, count, "\t%s:0x%x\n",
	GET_FIELD(record.last_sleep_transition_duration),
	record.last_sleep_transition_duration);

	record.last_wake_transition_duration =
	readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats,
	last_wake_transition_duration)));

	SNPRINTF(buf, count, "\t%s:0x%x\n",
	GET_FIELD(record.last_wake_transition_duration),
	record.last_wake_transition_duration);

	record.wakeup_reason = readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats,
	wakeup_reason)));

	SNPRINTF(buf, count, "\t%s:0x%x\n",
	GET_FIELD(record.wakeup_reason),
	record.wakeup_reason);

	record.numshutdowns = readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset +
	offsetof(struct msm_rpm_master_stats, numshutdowns)));

	SNPRINTF(buf, count, "\t%s:0x%x\n",
	GET_FIELD(record.numshutdowns),
	record.numshutdowns);

	record.active_cores = readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset) +
	offsetof(struct msm_rpm_master_stats, active_cores));

	SNPRINTF(buf, count, "\t%s:0x%x\n",
	GET_FIELD(record.active_cores),
	record.active_cores);
	} else {
	SNPRINTF(buf, count, "%s\n",
	GET_MASTER_NAME(master_cnt, prvdata));

	record.numshutdowns = readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset) + 0x0);

	SNPRINTF(buf, count, "\t%s:0x%0x\n",
	GET_FIELD(record.numshutdowns),
	record.numshutdowns);

	record.active_cores = readl_relaxed(prvdata->reg_base +
	(master_cnt * pdata->master_offset) + 0x4);

	SNPRINTF(buf, count, "\t%s:0x%0x\n",
	GET_FIELD(record.active_cores),
	record.active_cores);
	}

	j = find_first_bit((unsigned long *)&record.active_cores,
	BITS_PER_LONG);
	while (j < BITS_PER_LONG) {
	SNPRINTF(buf, count, "\t\tcore%d\n", j);
	j = find_next_bit((unsigned long *)&record.active_cores,
	BITS_PER_LONG, j + 1);
	}

	master_cnt++;
	mutex_unlock(&msm_rpm_master_stats_mutex);
	return RPM_MASTERS_BUF_LEN - count;
	}

	static int msm_rpm_master_stats_file_read(struct file file, char __user bufu,
	size_t count, loff_t *ppos)
	{
	struct msm_rpm_master_stats_private_data *prvdata;
	struct msm_rpm_master_stats_platform_data *pdata;

	prvdata = file->private_data;
	if (!prvdata)
	return -EINVAL;

	pdata = prvdata->platform_data;
	if (!pdata)
	return -EINVAL;

	if (!bufu \|\| count == 0)
	return -EINVAL;

	if ((*ppos <= pdata->phys_size)) {
	prvdata->len = msm_rpm_master_copy_stats(prvdata);
	*ppos = 0;
	}

	return simple_read_from_buffer(bufu, count, ppos,
	prvdata->buf, prvdata->len);
	}

	static int msm_rpm_master_stats_file_open(struct inode *inode,
	struct file *file)
	{
	struct msm_rpm_master_stats_private_data *prvdata;
	struct msm_rpm_master_stats_platform_data *pdata;

	pdata = inode->i_private;

	file->private_data =
	kzalloc(sizeof(struct msm_rpm_master_stats_private_data),
	GFP_KERNEL);

	if (!file->private_data)
	return -ENOMEM;
	prvdata = file->private_data;

	prvdata->reg_base = ioremap(pdata->phys_addr_base,
	pdata->phys_size);
	if (!prvdata->reg_base) {
	kfree(file->private_data);
	prvdata = NULL;
	pr_err("%s: ERROR could not ioremap start=%p, len=%u\n",
	__func__, (void *)pdata->phys_addr_base,
	pdata->phys_size);
	return -EBUSY;
	}

	prvdata->len = 0;
	prvdata->num_masters = pdata->num_masters;
	prvdata->master_names = pdata->masters;
	prvdata->platform_data = pdata;
	return 0;
	}

	static const struct file_operations msm_rpm_master_stats_fops = {
	.owner = THIS_MODULE,
	.open = msm_rpm_master_stats_file_open,
	.read = msm_rpm_master_stats_file_read,
	.release = msm_rpm_master_stats_file_close,
	.llseek = no_llseek,
	};

	static struct msm_rpm_master_stats_platform_data
	msm_rpm_master_populate_pdata(struct device dev)
	{
	struct msm_rpm_master_stats_platform_data *pdata;
	struct device_node *node = dev->of_node;
	int rc = 0, i;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
	dev_err(dev, "could not allocate memory for platform data\n");
	goto err;
	}

	rc = of_property_read_u32(node, "qcom,master-stats-version",
	&pdata->version);
	if (rc) {
	dev_err(dev, "master-stats-version missing rc=%d\n", rc);
	goto err;
	}

	rc = of_property_read_u32(node, "qcom,master-offset",
	&pdata->master_offset);
	if (rc) {
	dev_err(dev, "master-offset missing rc=%d\n", rc);
	goto err;
	}

	pdata->num_masters = of_property_count_strings(node, "qcom,masters");
	if (pdata->num_masters < 0) {
	dev_err(dev, "Failed to get number of masters =%d\n",
	pdata->num_masters);
	goto err;
	}

	pdata->masters = devm_kzalloc(dev, sizeof(char ) pdata->num_masters,
	GFP_KERNEL);
	if (!pdata->masters) {
	dev_err(dev, "%s:Failed to allocated memory\n", __func__);
	goto err;
	}

	/*
	* Read master names from DT
	*/
	for (i = 0; i < pdata->num_masters; i++) {
	const char *master_name;
	of_property_read_string_index(node, "qcom,masters",
	i, &master_name);
	pdata->masters[i] = devm_kzalloc(dev, sizeof(char) *
	strlen(master_name) + 1, GFP_KERNEL);
	if (!pdata->masters[i]) {
	dev_err(dev, "%s:Failed to get memory\n", __func__);
	goto err;
	}
	strlcpy(pdata->masters[i], master_name,
	strlen(master_name) + 1);
	}
	return pdata;
	err:
	return NULL;
	}

	static int __devinit msm_rpm_master_stats_probe(struct platform_device *pdev)
	{
	struct dentry *dent;
	struct msm_rpm_master_stats_platform_data *pdata;
	struct resource *res = NULL;

	if (!pdev)
	return -EINVAL;

	if (pdev->dev.of_node)
	pdata = msm_rpm_master_populate_pdata(&pdev->dev);
	else
	pdata = pdev->dev.platform_data;

	if (!pdata) {
	dev_err(&pdev->dev, "%s: Unable to get pdata\n", __func__);
	return -ENOMEM;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {
	dev_err(&pdev->dev,
	"%s: Failed to get IO resource from platform device",
	__func__);
	return -ENXIO;
	}

	pdata->phys_addr_base = res->start;
	pdata->phys_size = resource_size(res);

	dent = debugfs_create_file("rpm_master_stats", S_IRUGO, NULL,
	pdata, &msm_rpm_master_stats_fops);

	if (!dent) {
	dev_err(&pdev->dev, "%s: ERROR debugfs_create_file failed\n",
	__func__);
	return -ENOMEM;
	}

	platform_set_drvdata(pdev, dent);
	return 0;
	}

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

	dent = platform_get_drvdata(pdev);
	debugfs_remove(dent);
	platform_set_drvdata(pdev, NULL);
	return 0;
	}

	static struct of_device_id rpm_master_table[] = {
	{.compatible = "qcom,rpm-master-stats"},
	{},
	};

	static struct platform_driver msm_rpm_master_stats_driver = {
	.probe = msm_rpm_master_stats_probe,
	.remove = __devexit_p(msm_rpm_master_stats_remove),
	.driver = {
	.name = "msm_rpm_master_stats",
	.owner = THIS_MODULE,
	.of_match_table = rpm_master_table,
	},
	};

	static int __init msm_rpm_master_stats_init(void)
	{
	return platform_driver_register(&msm_rpm_master_stats_driver);
	}

	static void __exit msm_rpm_master_stats_exit(void)
	{
	platform_driver_unregister(&msm_rpm_master_stats_driver);
	}

	module_init(msm_rpm_master_stats_init);
	module_exit(msm_rpm_master_stats_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("MSM RPM Master Statistics driver");
	MODULE_VERSION("1.0");
	MODULE_ALIAS("platform:msm_master_stat_log");