clocks.c - platform/external/powerdebug - Git at Google

 /*******************************************************************************
  * Copyright (C) 2010, Linaro Limited.
  *
  * This file is part of PowerDebug.
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     Amit Arora <amit.arora@linaro.org> (IBM Corporation)
  *       - initial API and implementation
  *******************************************************************************/

 #include "powerdebug.h"
 #include "clocks.h"

 static char clk_dir_path[PATH_MAX];
 static char clk_name[NAME_MAX];
 static int  bold[MAX_LINES];

 int init_clock_details(bool dump, int selectedwindow)
 {
 	char *path = debugfs_locate_mpoint();
 	struct stat buf;

 	if (path)
 		strcpy(clk_dir_path, path);
 	else {
 		if (!dump) {
 			create_selectedwindow(selectedwindow);
 			sprintf(clock_lines[0], "Unable to locate debugfs "
 				"mount point. Mount debugfs "
 				"and try again..\n");
 			print_one_clock(0, clock_lines[0], 1, 0);
 			old_clock_line_no = 1;
 			return(1);
 		} else {
 			fprintf(stderr, "powerdebug: Unable to locate debugfs "
 				"mount point. Mount debugfs and try "
 				"again..\n");
 			exit(1);
 		}
 	}
 	sprintf(clk_dir_path, "%s/clock", clk_dir_path);
 	//strcpy(clk_dir_path, "/debug/clock"); // Hardcoded for testing..
 	if (stat(clk_dir_path, &buf)) {
 		if (!dump) {
 			create_selectedwindow(selectedwindow);
 			sprintf(clock_lines[0], "Unable to find clock tree"
 				" information at %s.\n", clk_dir_path);
 			print_one_clock(0, clock_lines[0], 1, 0);
 			old_clock_line_no = 1;
 			return(1);
 		} else {
 			fprintf(stderr, "powerdebug: Unable to find clock tree"
 				" information at %s.\n", clk_dir_path);
 			exit(1);
 		}
 	}
 	strcpy(clk_name, "");
 	return(0);
 }

 int get_int_from(char *file)
 {
 	FILE *filep;
 	char result[NAME_MAX];
 	int ret;

 	filep = fopen(file, "r");

 	if (!filep)
 		return -1;  //TBD : What should we return on failure, here ?

 	ret = fscanf(filep, "%s", result);
 	fclose(filep);

 	return atoi(result);
 }

 static void dump_parent(struct clock_info *clk, int line, bool dump)
 {
 	char *unit = "Hz";
 	double drate;
 	static char spaces[64];
 	char str[256];
 	static int maxline;

 	if (maxline < line)
 		maxline = line;

 	if (clk && clk->parent)
 		dump_parent(clk->parent, ++line, dump);

 	drate = (double)clk->rate;
 	if (drate > 1000 && drate < 1000000) {
 		unit = "KHz";
 		drate /= 1000;
 	}
 	if (drate > 1000000) {
 		unit = "MHz";
 		drate /= 1000000;
 	}
 	if (clk == clocks_info) {
 		line++;
 		strcpy(spaces, "");
 		sprintf(str, "%s%s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
 			spaces, clk->name, clk->flags, clk->usecount, drate,
 			unit);
 	} else {
 		if (!(clk->parent == clocks_info))
 			strcat(spaces, "  ");
 		sprintf(str, "%s`- %s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
 			spaces, clk->name, clk->flags, clk->usecount, drate,
 			unit);
 	}
 	if (dump)
 		//printf("line=%d:m%d:l%d %s", maxline - line + 2, maxline, line, str);
 		printf("%s", str);
 	else
 		print_one_clock(maxline - line + 2, str, 1, 0);
 }

 static void dump_all_parents(char *clkarg, bool dump)
 {
 	struct clock_info *clk;
 	char spaces[1024];

 	strcpy(spaces, "");

 	clk = find_clock(clocks_info, clkarg);

 	if (!clk)
 		printf("Clock NOT found!\n");
 	else {
 		/* while(clk && clk != clocks_info) { */
 		/* 	printf("%s\n", clk->name); */
 		/* 	strcat(spaces, "  "); */
 		/* 	clk = clk->parent; */
 		/* 	printf("%s <-- ", spaces); */
 		/* } */
 		/* printf("  /\n"); */
 		dump_parent(clk, 1, dump);
 	}
 }

 void find_parents_for_clock(char *clkname, int complete, bool dump)
 {
 	char name[256];

 	name[0] = '\0';
 	if (!complete) {
 		char str[256];

 		strcat(name, clkname);
 		sprintf(str, "Enter Clock Name : %s\n", name);
 		print_one_clock(2, str, 1, 0);
 		return;
 	}
 	sprintf(name, "Parents for \"%s\" Clock : \n", clkname);
 	print_one_clock(0, name, 1, 1);
 	dump_all_parents(clkname, dump);
 }

 int read_and_print_clock_info(int verbose, int hrow, int selected)
 {
 	print_one_clock(0, "Reading Clock Tree ...", 1, 1);

 	if (!old_clock_line_no || selected == REFRESH_WINDOW) {
 		destroy_clocks_info();
 		read_clock_info(clk_dir_path);
 	}

 	if (!clocks_info->num_children) {
 		fprintf(stderr, "powerdebug: No clocks found. Exiting..\n");
 		exit(1);
 	}

 	if (selected == CLOCK_SELECTED)
 		selected = 1;
 	else
 		selected = 0;

 	print_clock_info(verbose, hrow, selected);
 	hrow = (hrow < old_clock_line_no) ? hrow : old_clock_line_no - 1;

 	return hrow;
 }

 int calc_delta_screen_size(int hrow)
 {
 	if (hrow >= (maxy - 3))
 		return hrow - (maxy - 4);

 	return 0;
 }

 void print_clock_info(int verbose, int hrow, int selected)
 {
 	int i, count = 0, delta;

 	(void)verbose;

 	print_clock_header();

 	for (i = 0; i < clocks_info->num_children; i++)
 		add_clock_details_recur(clocks_info->children[i],
 					hrow, selected);

 	delta = calc_delta_screen_size(hrow);

 	while (clock_lines[count + delta] &&
 		strcmp(clock_lines[count + delta], "")) {
 		if (count < delta) {
 			count++;
 			continue;
 		}
 		print_one_clock(count - delta, clock_lines[count + delta],
 				bold[count + delta], (hrow == (count + delta)));
 		count++;
 	}

 	old_clock_line_no = clock_line_no;
 	clock_line_no = 0;
 }

 void prepare_name_str(char *namestr, struct clock_info *clock)
 {
 	int i;

 	strcpy(namestr, "");
 	if (clock->level > 1)
 		for (i = 0; i < (clock->level - 1); i++)
 			strcat(namestr, "  ");
 	strcat(namestr, clock->name);
 }

 void add_clock_details_recur(struct clock_info *clock, int hrow, int selected)
 {
 	int i;
 	char *unit = " Hz";
 	char rate_str[64];
 	char name_str[256];
 	double drate = (double)clock->rate;

 	if (drate > 1000 && drate < 1000000) {
 		unit = "KHz";
 		drate /= 1000;
 	}
 	if (drate > 1000000) {
 		unit = "MHz";
 		drate /= 1000000;
 	}
 	if (clock->usecount)
 		bold[clock_line_no] = 1;
 	else
 		bold[clock_line_no] = 0;

 	sprintf(rate_str, "%.2f %s", drate, unit);
 	prepare_name_str(name_str, clock);
 	sprintf(clock_lines[clock_line_no++], "%-55s %-4d  %-12s %-12d %-12d",
 		name_str, clock->flags, rate_str, clock->usecount,
 		clock->num_children);

 	if (selected && (hrow == (clock_line_no - 1))) {
 		if (clock->expanded)
 			collapse_all_subclocks(clock);
 		else
 			clock->expanded = 1;
 		selected = 0;
 	}

 	if (clock->expanded && clock->num_children)
 		for (i = 0; i < clock->num_children; i++)
 			add_clock_details_recur(clock->children[i],
 						hrow, selected);
 	strcpy(clock_lines[clock_line_no], "");
 }

 void collapse_all_subclocks(struct clock_info *clock)
 {
 	int i;

 	clock->expanded = 0;
 	if (clock->num_children)
 		for (i = 0; i < clock->num_children; i++)
 			collapse_all_subclocks(clock->children[i]);
 }

 void destroy_clocks_info(void)
 {
 	int i;

 	if (!clocks_info)
 		return;

 	if (clocks_info->num_children) {
 		for (i = (clocks_info->num_children - 1); i >= 0 ; i--) {
 			destroy_clocks_info_recur(clocks_info->children[i]);
 			if (!i) {
 				free(clocks_info->children);
 				clocks_info->children = NULL;
 			}
 		}
 	}
 	clocks_info->num_children = 0;
 	free(clocks_info);
 	clocks_info = NULL;
 }

 void destroy_clocks_info_recur(struct clock_info *clock)
 {
 	int i;

 	if (clock && clock->num_children) {
 		for (i = (clock->num_children - 1); i >= 0; i--) {
 			fflush(stdin);
 			destroy_clocks_info_recur(clock->children[i]);
 			if (!i) {
 				free(clock->children);
 				clock->children = NULL;
 				clock->num_children = 0;
 			}
 		}
 	}
 }

 void read_and_dump_clock_info_one(char *clk, bool dump)
 {
 	printf("\nParents for \"%s\" Clock :\n\n", clk);
 	read_clock_info(clk_dir_path);
 	dump_all_parents(clk, dump);
 	printf("\n\n");
 }

 void read_and_dump_clock_info(int verbose)
 {
 	(void)verbose;
 	printf("\nClock Tree :\n");
 	printf("**********\n");
 	read_clock_info(clk_dir_path);
 	dump_clock_info(clocks_info, 1, 1);
 	printf("\n\n");
 }

 void read_clock_info(char *clkpath)
 {
 	DIR *dir;
 	struct dirent *item;
 	char filename[NAME_MAX], clockname[NAME_MAX];
 	struct clock_info *child;
 	struct clock_info *cur;

 	dir = opendir(clkpath);
 	if (!dir)
 		return;

 	clocks_info = (struct clock_info *)malloc(sizeof(struct clock_info));
 	memset(clocks_info, 0, sizeof(clocks_info));
 	strcpy(clocks_info->name, "/");
 	clocks_info->level = 0;

 	while ((item = readdir(dir))) {
 		/* skip hidden dirs except ".." */
 		if (item->d_name[0] == '.')
 			continue;

 		strcpy(clockname, item->d_name);
 		sprintf(filename, "%s/%s", clkpath, item->d_name);
 		cur = (struct clock_info *)malloc(sizeof(struct clock_info));
 		memset(cur, 0, sizeof(struct clock_info));
 		strcpy(cur->name, clockname);
 		cur->parent = clocks_info;
 		cur->num_children = 0;
 		cur->expanded = 0;
 		cur->level = 1;
 		insert_children(&clocks_info, cur);
 		child = read_clock_info_recur(filename, 2, cur);
 	}
 	closedir(dir);
 }

 struct clock_info *read_clock_info_recur(char *clkpath, int level,
 					struct clock_info *parent)
 {
 	int ret = 0;
 	DIR *dir;
 	char filename[PATH_MAX];
 	struct dirent *item;
 	struct clock_info *cur = NULL;
 	struct stat buf;

 	dir = opendir(clkpath);
 	if (!dir)
 		return NULL;

 	while ((item = readdir(dir))) {
 		struct clock_info *child;
 		/* skip hidden dirs except ".." */
 		if (item->d_name[0] == '.' )
 			continue;

 		sprintf(filename, "%s/%s", clkpath, item->d_name);

 		ret = stat(filename, &buf);

 		if (ret < 0) {
 			printf("Error doing a stat on %s\n", filename);
 			exit(1);
 		}

 		if (S_ISREG(buf.st_mode)) {
 			if (!strcmp(item->d_name, "flags"))
 				parent->flags = get_int_from(filename);
 			if (!strcmp(item->d_name, "rate"))
 				parent->rate = get_int_from(filename);
 			if (!strcmp(item->d_name, "usecount"))
 				parent->usecount = get_int_from(filename);
 			continue;
 		}

 		if (!S_ISDIR(buf.st_mode))
 			continue;

 		cur = (struct clock_info *)malloc(sizeof(struct clock_info));
 		memset(cur, 0, sizeof(cur));
 		strcpy(cur->name, item->d_name);
 		cur->children = NULL;
 		cur->parent = NULL;
 		cur->num_children = 0;
 		cur->expanded = 0;
 		cur->level = level;
 		child = read_clock_info_recur(filename, level + 1, cur);
 		insert_children(&parent, cur);
 		cur->parent = parent;
 	}
 	closedir(dir);

 	return cur;
 }

 void insert_children(struct clock_info **parent, struct clock_info *clk)
 {
 	if (!(*parent)->num_children || (*parent)->children == NULL) {
 		(*parent)->children = (struct clock_info **)
 			malloc(sizeof(struct clock_info *)*2);
 		(*parent)->num_children = 0;
 	} else
 		(*parent)->children = (struct clock_info **)
 			realloc((*parent)->children,
 				sizeof(struct clock_info *) *
 				((*parent)->num_children + 2));
 	if ((*parent)->num_children > 0)
 		(*parent)->children[(*parent)->num_children - 1]->last_child
 			= 0;
 	clk->last_child = 1;
 	(*parent)->children[(*parent)->num_children] = clk;
 	(*parent)->children[(*parent)->num_children + 1] = NULL;
 	(*parent)->num_children++;
 }

 struct clock_info *find_clock(struct clock_info *clk, char *clkarg)
 {
 	int i;
 	struct clock_info *ret = clk;

 	if (!strcmp(clk->name, clkarg))
 		return ret;

 	if (clk->children) {
 		for (i = 0; i < clk->num_children; i++) {
 			if (!strcmp(clk->children[i]->name, clkarg))
 				return clk->children[i];
 		}
 		for (i = 0; i < clk->num_children; i++) {
 			ret = find_clock(clk->children[i], clkarg);
 			if (ret)
 				return ret;
 		}
 	}

 	return NULL;
 }


 void dump_clock_info(struct clock_info *clk, int level, int bmp)
 {
 	int i, j;

 	if (!clk)
 		return;

 	for (i = 1, j = 0; i < level; i++, j = (i - 1)) {
 		if (i == (level - 1)) {
 			if (clk->last_child)
 				printf("`-- ");
 			else
 				printf("|-- ");
 		} else {
 			if ((1<<j) & bmp)
 				printf("|   ");
 			else
 				printf("    ");
 		}
 	}

 	if (clk == clocks_info)
 		printf("%s\n", clk->name);
 	else {
 		char *unit = "Hz";
 		double drate = (double)clk->rate;

 		if (drate > 1000 && drate < 1000000) {
 			unit = "KHz";
 			drate /= 1000;
 		}
 		if (drate > 1000000) {
 			unit = "MHz";
 			drate /= 1000000;
 		}
 		printf("%s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
 			clk->name, clk->flags, clk->usecount, drate, unit);
 	}
 	if (clk->children) {
 		int tbmp = bmp;
 		int xbmp = -1;

 		if (clk->last_child) {
 			xbmp ^= 1 << (level - 2);

 			xbmp = tbmp & xbmp;
 		} else
 			xbmp = bmp;
 		for (i = 0; i < clk->num_children; i++) {
 			tbmp = xbmp | (1 << level);
 			dump_clock_info(clk->children[i], level + 1, tbmp);
 		}
 	}
 }

 char *debugfs_locate_mpoint(void)
 {
 	int ret;
 	FILE *filep;
 	char **path;
 	char fsname[64];
 	struct statfs sfs;

 	path = likely_mpoints;
 	while (*path) {
 		ret = statfs(*path, &sfs);
 		if (ret >= 0 && sfs.f_type == (long)DEBUGFS_MAGIC)
 			return *path;
 		path++;
 	}

 	filep = fopen("/proc/mounts", "r");
 	if (filep == NULL) {
 		fprintf(stderr, "powerdebug: Error opening /proc/mounts.");
 		exit(1);
 	}

 	while (fscanf(filep, "%*s %s %s %*s %*d %*d\n",
 			debugfs_mntpoint, fsname) == 2)
 		if (!strcmp(fsname, "debugfs"))
 			break;
 	fclose(filep);

 	if (strcmp(fsname, "debugfs"))
 		return NULL;

 	return debugfs_mntpoint;
 }
	/*******************************************************************************
	* Copyright (C) 2010, Linaro Limited.
	*
	* This file is part of PowerDebug.
	*
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Amit Arora <amit.arora@linaro.org> (IBM Corporation)
	* - initial API and implementation
	*******************************************************************************/

	#include "powerdebug.h"
	#include "clocks.h"

	static char clk_dir_path[PATH_MAX];
	static char clk_name[NAME_MAX];
	static int bold[MAX_LINES];

	int init_clock_details(bool dump, int selectedwindow)
	{
	char *path = debugfs_locate_mpoint();
	struct stat buf;

	if (path)
	strcpy(clk_dir_path, path);
	else {
	if (!dump) {
	create_selectedwindow(selectedwindow);
	sprintf(clock_lines[0], "Unable to locate debugfs "
	"mount point. Mount debugfs "
	"and try again..\n");
	print_one_clock(0, clock_lines[0], 1, 0);
	old_clock_line_no = 1;
	return(1);
	} else {
	fprintf(stderr, "powerdebug: Unable to locate debugfs "
	"mount point. Mount debugfs and try "
	"again..\n");
	exit(1);
	}
	}
	sprintf(clk_dir_path, "%s/clock", clk_dir_path);
	//strcpy(clk_dir_path, "/debug/clock"); // Hardcoded for testing..
	if (stat(clk_dir_path, &buf)) {
	if (!dump) {
	create_selectedwindow(selectedwindow);
	sprintf(clock_lines[0], "Unable to find clock tree"
	" information at %s.\n", clk_dir_path);
	print_one_clock(0, clock_lines[0], 1, 0);
	old_clock_line_no = 1;
	return(1);
	} else {
	fprintf(stderr, "powerdebug: Unable to find clock tree"
	" information at %s.\n", clk_dir_path);
	exit(1);
	}
	}
	strcpy(clk_name, "");
	return(0);
	}

	int get_int_from(char *file)
	{
	FILE *filep;
	char result[NAME_MAX];
	int ret;

	filep = fopen(file, "r");

	if (!filep)
	return -1; //TBD : What should we return on failure, here ?

	ret = fscanf(filep, "%s", result);
	fclose(filep);

	return atoi(result);
	}

	static void dump_parent(struct clock_info *clk, int line, bool dump)
	{
	char *unit = "Hz";
	double drate;
	static char spaces[64];
	char str[256];
	static int maxline;

	if (maxline < line)
	maxline = line;

	if (clk && clk->parent)
	dump_parent(clk->parent, ++line, dump);

	drate = (double)clk->rate;
	if (drate > 1000 && drate < 1000000) {
	unit = "KHz";
	drate /= 1000;
	}
	if (drate > 1000000) {
	unit = "MHz";
	drate /= 1000000;
	}
	if (clk == clocks_info) {
	line++;
	strcpy(spaces, "");
	sprintf(str, "%s%s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
	spaces, clk->name, clk->flags, clk->usecount, drate,
	unit);
	} else {
	if (!(clk->parent == clocks_info))
	strcat(spaces, " ");
	sprintf(str, "%s`- %s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
	spaces, clk->name, clk->flags, clk->usecount, drate,
	unit);
	}
	if (dump)
	//printf("line=%d:m%d:l%d %s", maxline - line + 2, maxline, line, str);
	printf("%s", str);
	else
	print_one_clock(maxline - line + 2, str, 1, 0);
	}

	static void dump_all_parents(char *clkarg, bool dump)
	{
	struct clock_info *clk;
	char spaces[1024];

	strcpy(spaces, "");

	clk = find_clock(clocks_info, clkarg);

	if (!clk)
	printf("Clock NOT found!\n");
	else {
	/* while(clk && clk != clocks_info) { */
	/* printf("%s\n", clk->name); */
	/* strcat(spaces, " "); */
	/* clk = clk->parent; */
	/* printf("%s <-- ", spaces); */
	/* } */
	/* printf(" /\n"); */
	dump_parent(clk, 1, dump);
	}
	}

	void find_parents_for_clock(char *clkname, int complete, bool dump)
	{
	char name[256];

	name[0] = '\0';
	if (!complete) {
	char str[256];

	strcat(name, clkname);
	sprintf(str, "Enter Clock Name : %s\n", name);
	print_one_clock(2, str, 1, 0);
	return;
	}
	sprintf(name, "Parents for \"%s\" Clock : \n", clkname);
	print_one_clock(0, name, 1, 1);
	dump_all_parents(clkname, dump);
	}

	int read_and_print_clock_info(int verbose, int hrow, int selected)
	{
	print_one_clock(0, "Reading Clock Tree ...", 1, 1);

	if (!old_clock_line_no \|\| selected == REFRESH_WINDOW) {
	destroy_clocks_info();
	read_clock_info(clk_dir_path);
	}

	if (!clocks_info->num_children) {
	fprintf(stderr, "powerdebug: No clocks found. Exiting..\n");
	exit(1);
	}

	if (selected == CLOCK_SELECTED)
	selected = 1;
	else
	selected = 0;

	print_clock_info(verbose, hrow, selected);
	hrow = (hrow < old_clock_line_no) ? hrow : old_clock_line_no - 1;

	return hrow;
	}

	int calc_delta_screen_size(int hrow)
	{
	if (hrow >= (maxy - 3))
	return hrow - (maxy - 4);

	return 0;
	}

	void print_clock_info(int verbose, int hrow, int selected)
	{
	int i, count = 0, delta;

	(void)verbose;

	print_clock_header();

	for (i = 0; i < clocks_info->num_children; i++)
	add_clock_details_recur(clocks_info->children[i],
	hrow, selected);

	delta = calc_delta_screen_size(hrow);

	while (clock_lines[count + delta] &&
	strcmp(clock_lines[count + delta], "")) {
	if (count < delta) {
	count++;
	continue;
	}
	print_one_clock(count - delta, clock_lines[count + delta],
	bold[count + delta], (hrow == (count + delta)));
	count++;
	}

	old_clock_line_no = clock_line_no;
	clock_line_no = 0;
	}

	void prepare_name_str(char namestr, struct clock_info clock)
	{
	int i;

	strcpy(namestr, "");
	if (clock->level > 1)
	for (i = 0; i < (clock->level - 1); i++)
	strcat(namestr, " ");
	strcat(namestr, clock->name);
	}

	void add_clock_details_recur(struct clock_info *clock, int hrow, int selected)
	{
	int i;
	char *unit = " Hz";
	char rate_str[64];
	char name_str[256];
	double drate = (double)clock->rate;

	if (drate > 1000 && drate < 1000000) {
	unit = "KHz";
	drate /= 1000;
	}
	if (drate > 1000000) {
	unit = "MHz";
	drate /= 1000000;
	}
	if (clock->usecount)
	bold[clock_line_no] = 1;
	else
	bold[clock_line_no] = 0;

	sprintf(rate_str, "%.2f %s", drate, unit);
	prepare_name_str(name_str, clock);
	sprintf(clock_lines[clock_line_no++], "%-55s %-4d %-12s %-12d %-12d",
	name_str, clock->flags, rate_str, clock->usecount,
	clock->num_children);

	if (selected && (hrow == (clock_line_no - 1))) {
	if (clock->expanded)
	collapse_all_subclocks(clock);
	else
	clock->expanded = 1;
	selected = 0;
	}

	if (clock->expanded && clock->num_children)
	for (i = 0; i < clock->num_children; i++)
	add_clock_details_recur(clock->children[i],
	hrow, selected);
	strcpy(clock_lines[clock_line_no], "");
	}

	void collapse_all_subclocks(struct clock_info *clock)
	{
	int i;

	clock->expanded = 0;
	if (clock->num_children)
	for (i = 0; i < clock->num_children; i++)
	collapse_all_subclocks(clock->children[i]);
	}

	void destroy_clocks_info(void)
	{
	int i;

	if (!clocks_info)
	return;

	if (clocks_info->num_children) {
	for (i = (clocks_info->num_children - 1); i >= 0 ; i--) {
	destroy_clocks_info_recur(clocks_info->children[i]);
	if (!i) {
	free(clocks_info->children);
	clocks_info->children = NULL;
	}
	}
	}
	clocks_info->num_children = 0;
	free(clocks_info);
	clocks_info = NULL;
	}

	void destroy_clocks_info_recur(struct clock_info *clock)
	{
	int i;

	if (clock && clock->num_children) {
	for (i = (clock->num_children - 1); i >= 0; i--) {
	fflush(stdin);
	destroy_clocks_info_recur(clock->children[i]);
	if (!i) {
	free(clock->children);
	clock->children = NULL;
	clock->num_children = 0;
	}
	}
	}
	}

	void read_and_dump_clock_info_one(char *clk, bool dump)
	{
	printf("\nParents for \"%s\" Clock :\n\n", clk);
	read_clock_info(clk_dir_path);
	dump_all_parents(clk, dump);
	printf("\n\n");
	}

	void read_and_dump_clock_info(int verbose)
	{
	(void)verbose;
	printf("\nClock Tree :\n");
	printf("**********\n");
	read_clock_info(clk_dir_path);
	dump_clock_info(clocks_info, 1, 1);
	printf("\n\n");
	}

	void read_clock_info(char *clkpath)
	{
	DIR *dir;
	struct dirent *item;
	char filename[NAME_MAX], clockname[NAME_MAX];
	struct clock_info *child;
	struct clock_info *cur;

	dir = opendir(clkpath);
	if (!dir)
	return;

	clocks_info = (struct clock_info *)malloc(sizeof(struct clock_info));
	memset(clocks_info, 0, sizeof(clocks_info));
	strcpy(clocks_info->name, "/");
	clocks_info->level = 0;

	while ((item = readdir(dir))) {
	/* skip hidden dirs except ".." */
	if (item->d_name[0] == '.')
	continue;

	strcpy(clockname, item->d_name);
	sprintf(filename, "%s/%s", clkpath, item->d_name);
	cur = (struct clock_info *)malloc(sizeof(struct clock_info));
	memset(cur, 0, sizeof(struct clock_info));
	strcpy(cur->name, clockname);
	cur->parent = clocks_info;
	cur->num_children = 0;
	cur->expanded = 0;
	cur->level = 1;
	insert_children(&clocks_info, cur);
	child = read_clock_info_recur(filename, 2, cur);
	}
	closedir(dir);
	}

	struct clock_info read_clock_info_recur(char clkpath, int level,
	struct clock_info *parent)
	{
	int ret = 0;
	DIR *dir;
	char filename[PATH_MAX];
	struct dirent *item;
	struct clock_info *cur = NULL;
	struct stat buf;

	dir = opendir(clkpath);
	if (!dir)
	return NULL;

	while ((item = readdir(dir))) {
	struct clock_info *child;
	/* skip hidden dirs except ".." */
	if (item->d_name[0] == '.' )
	continue;

	sprintf(filename, "%s/%s", clkpath, item->d_name);

	ret = stat(filename, &buf);

	if (ret < 0) {
	printf("Error doing a stat on %s\n", filename);
	exit(1);
	}

	if (S_ISREG(buf.st_mode)) {
	if (!strcmp(item->d_name, "flags"))
	parent->flags = get_int_from(filename);
	if (!strcmp(item->d_name, "rate"))
	parent->rate = get_int_from(filename);
	if (!strcmp(item->d_name, "usecount"))
	parent->usecount = get_int_from(filename);
	continue;
	}

	if (!S_ISDIR(buf.st_mode))
	continue;

	cur = (struct clock_info *)malloc(sizeof(struct clock_info));
	memset(cur, 0, sizeof(cur));
	strcpy(cur->name, item->d_name);
	cur->children = NULL;
	cur->parent = NULL;
	cur->num_children = 0;
	cur->expanded = 0;
	cur->level = level;
	child = read_clock_info_recur(filename, level + 1, cur);
	insert_children(&parent, cur);
	cur->parent = parent;
	}
	closedir(dir);

	return cur;
	}

	void insert_children(struct clock_info *parent, struct clock_info clk)
	{
	if (!(parent)->num_children \|\| (parent)->children == NULL) {
	(parent)->children = (struct clock_info *)
	malloc(sizeof(struct clock_info )2);
	(*parent)->num_children = 0;
	} else
	(parent)->children = (struct clock_info *)
	realloc((*parent)->children,
	sizeof(struct clock_info )
	((*parent)->num_children + 2));
	if ((*parent)->num_children > 0)
	(parent)->children[(parent)->num_children - 1]->last_child
	= 0;
	clk->last_child = 1;
	(parent)->children[(parent)->num_children] = clk;
	(parent)->children[(parent)->num_children + 1] = NULL;
	(*parent)->num_children++;
	}

	struct clock_info find_clock(struct clock_info clk, char *clkarg)
	{
	int i;
	struct clock_info *ret = clk;

	if (!strcmp(clk->name, clkarg))
	return ret;

	if (clk->children) {
	for (i = 0; i < clk->num_children; i++) {
	if (!strcmp(clk->children[i]->name, clkarg))
	return clk->children[i];
	}
	for (i = 0; i < clk->num_children; i++) {
	ret = find_clock(clk->children[i], clkarg);
	if (ret)
	return ret;
	}
	}

	return NULL;
	}


	void dump_clock_info(struct clock_info *clk, int level, int bmp)
	{
	int i, j;

	if (!clk)
	return;

	for (i = 1, j = 0; i < level; i++, j = (i - 1)) {
	if (i == (level - 1)) {
	if (clk->last_child)
	printf("`-- ");
	else
	printf("\|-- ");
	} else {
	if ((1<<j) & bmp)
	printf("\| ");
	else
	printf(" ");
	}
	}

	if (clk == clocks_info)
	printf("%s\n", clk->name);
	else {
	char *unit = "Hz";
	double drate = (double)clk->rate;

	if (drate > 1000 && drate < 1000000) {
	unit = "KHz";
	drate /= 1000;
	}
	if (drate > 1000000) {
	unit = "MHz";
	drate /= 1000000;
	}
	printf("%s (flags:%d,usecount:%d,rate:%5.2f %s)\n",
	clk->name, clk->flags, clk->usecount, drate, unit);
	}
	if (clk->children) {
	int tbmp = bmp;
	int xbmp = -1;

	if (clk->last_child) {
	xbmp ^= 1 << (level - 2);

	xbmp = tbmp & xbmp;
	} else
	xbmp = bmp;
	for (i = 0; i < clk->num_children; i++) {
	tbmp = xbmp \| (1 << level);
	dump_clock_info(clk->children[i], level + 1, tbmp);
	}
	}
	}

	char *debugfs_locate_mpoint(void)
	{
	int ret;
	FILE *filep;
	char **path;
	char fsname[64];
	struct statfs sfs;

	path = likely_mpoints;
	while (*path) {
	ret = statfs(*path, &sfs);
	if (ret >= 0 && sfs.f_type == (long)DEBUGFS_MAGIC)
	return *path;
	path++;
	}

	filep = fopen("/proc/mounts", "r");
	if (filep == NULL) {
	fprintf(stderr, "powerdebug: Error opening /proc/mounts.");
	exit(1);
	}

	while (fscanf(filep, "%s %s %s %s %d %d\n",
	debugfs_mntpoint, fsname) == 2)
	if (!strcmp(fsname, "debugfs"))
	break;
	fclose(filep);

	if (strcmp(fsname, "debugfs"))
	return NULL;

	return debugfs_mntpoint;
	}