drivers/acpi/debug.c - kernel/msm - Gitiles

 /*
  * debug.c - ACPI debug interface to userspace.
  */

 #include <linux/proc_fs.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/moduleparam.h>
 #include <asm/uaccess.h>
 #include <acpi/acpi_drivers.h>

 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("debug");

 struct acpi_dlayer {
 	const char *name;
 	unsigned long value;
 };
 struct acpi_dlevel {
 	const char *name;
 	unsigned long value;
 };
 #define ACPI_DEBUG_INIT(v)	{ .name = #v, .value = v }

 static const struct acpi_dlayer acpi_debug_layers[] = {
 	ACPI_DEBUG_INIT(ACPI_UTILITIES),
 	ACPI_DEBUG_INIT(ACPI_HARDWARE),
 	ACPI_DEBUG_INIT(ACPI_EVENTS),
 	ACPI_DEBUG_INIT(ACPI_TABLES),
 	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
 	ACPI_DEBUG_INIT(ACPI_PARSER),
 	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
 	ACPI_DEBUG_INIT(ACPI_EXECUTER),
 	ACPI_DEBUG_INIT(ACPI_RESOURCES),
 	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
 	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
 	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
 	ACPI_DEBUG_INIT(ACPI_COMPILER),
 	ACPI_DEBUG_INIT(ACPI_TOOLS),

 	ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
 	ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
 };

 static const struct acpi_dlevel acpi_debug_levels[] = {
 	ACPI_DEBUG_INIT(ACPI_LV_INIT),
 	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
 	ACPI_DEBUG_INIT(ACPI_LV_INFO),

 	ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
 	ACPI_DEBUG_INIT(ACPI_LV_PARSE),
 	ACPI_DEBUG_INIT(ACPI_LV_LOAD),
 	ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
 	ACPI_DEBUG_INIT(ACPI_LV_EXEC),
 	ACPI_DEBUG_INIT(ACPI_LV_NAMES),
 	ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
 	ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
 	ACPI_DEBUG_INIT(ACPI_LV_TABLES),
 	ACPI_DEBUG_INIT(ACPI_LV_VALUES),
 	ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
 	ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
 	ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
 	ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),

 	ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
 	ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
 	ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),

 	ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
 	ACPI_DEBUG_INIT(ACPI_LV_THREADS),
 	ACPI_DEBUG_INIT(ACPI_LV_IO),
 	ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),

 	ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
 	ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
 	ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
 	ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
 };

 /* --------------------------------------------------------------------------
                               FS Interface (/sys)
    -------------------------------------------------------------------------- */
 static int param_get_debug_layer(char *buffer, struct kernel_param *kp) {
 	int result = 0;
 	int i;

 	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

 	for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
 		result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 					acpi_debug_layers[i].name,
 					acpi_debug_layers[i].value,
 					(acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
 	}
 	result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 					ACPI_ALL_DRIVERS,
 					(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 					ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 					ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
 	result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);

 	return result;
 }

 static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
 	int result = 0;
 	int i;

 	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

 	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 		result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 				     acpi_debug_levels[i].name,
 				     acpi_debug_levels[i].value,
 				     (acpi_dbg_level & acpi_debug_levels[i].
 				      value) ? '*' : ' ');
 	}
 	result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 			     acpi_dbg_level);

 	return result;
 }

 module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
 module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);

 static char trace_method_name[6];
 module_param_string(trace_method_name, trace_method_name, 6, 0644);
 static unsigned int trace_debug_layer;
 module_param(trace_debug_layer, uint, 0644);
 static unsigned int trace_debug_level;
 module_param(trace_debug_level, uint, 0644);

 static int param_set_trace_state(const char *val, struct kernel_param *kp)
 {
 	int result = 0;

 	if (!strncmp(val, "enable", strlen("enable") - 1)) {
 		result = acpi_debug_trace(trace_method_name, trace_debug_level,
 					  trace_debug_layer, 0);
 		if (result)
 			result = -EBUSY;
 		goto exit;
 	}

 	if (!strncmp(val, "disable", strlen("disable") - 1)) {
 		int name = 0;
 		result = acpi_debug_trace((char *)&name, trace_debug_level,
 					  trace_debug_layer, 0);
 		if (result)
 			result = -EBUSY;
 		goto exit;
 	}

 	if (!strncmp(val, "1", 1)) {
 		result = acpi_debug_trace(trace_method_name, trace_debug_level,
 					  trace_debug_layer, 1);
 		if (result)
 			result = -EBUSY;
 		goto exit;
 	}

 	result = -EINVAL;
 exit:
 	return result;
 }

 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
 {
 	if (!acpi_gbl_trace_method_name)
 		return sprintf(buffer, "disable");
 	else {
 		if (acpi_gbl_trace_flags & 1)
 			return sprintf(buffer, "1");
 		else
 			return sprintf(buffer, "enable");
 	}
 	return 0;
 }

 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 		  NULL, 0644);

 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
 #ifdef CONFIG_ACPI_PROCFS
 #define ACPI_SYSTEM_FILE_DEBUG_LAYER	"debug_layer"
 #define ACPI_SYSTEM_FILE_DEBUG_LEVEL		"debug_level"

 static int
 acpi_system_read_debug(char *page,
 		       char **start, off_t off, int count, int *eof, void *data)
 {
 	char *p = page;
 	int size = 0;
 	unsigned int i;

 	if (off != 0)
 		goto end;

 	p += sprintf(p, "%-25s\tHex        SET\n", "Description");

 	switch ((unsigned long)data) {
 	case 0:
 		for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 			p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 				     acpi_debug_layers[i].name,
 				     acpi_debug_layers[i].value,
 				     (acpi_dbg_layer & acpi_debug_layers[i].
 				      value) ? '*' : ' ');
 		}
 		p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 			     ACPI_ALL_DRIVERS,
 			     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 			     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 						       ACPI_ALL_DRIVERS) ==
 			     0 ? ' ' : '-');
 		p += sprintf(p,
 			     "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
 			     acpi_dbg_layer);
 		break;
 	case 1:
 		for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 			p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 				     acpi_debug_levels[i].name,
 				     acpi_debug_levels[i].value,
 				     (acpi_dbg_level & acpi_debug_levels[i].
 				      value) ? '*' : ' ');
 		}
 		p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
 			     acpi_dbg_level);
 		break;
 	default:
 		p += sprintf(p, "Invalid debug option\n");
 		break;
 	}

       end:
 	size = (p - page);
 	if (size <= off + count)
 		*eof = 1;
 	*start = page + off;
 	size -= off;
 	if (size > count)
 		size = count;
 	if (size < 0)
 		size = 0;

 	return size;
 }

 static int
 acpi_system_write_debug(struct file *file,
 			const char __user * buffer,
 			unsigned long count, void *data)
 {
 	char debug_string[12] = { '\0' };


 	if (count > sizeof(debug_string) - 1)
 		return -EINVAL;

 	if (copy_from_user(debug_string, buffer, count))
 		return -EFAULT;

 	debug_string[count] = '\0';

 	switch ((unsigned long)data) {
 	case 0:
 		acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
 		break;
 	case 1:
 		acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return count;
 }
 #endif

 int __init acpi_debug_init(void)
 {
 #ifdef CONFIG_ACPI_PROCFS
 	struct proc_dir_entry *entry;
 	int error = 0;
 	char *name;

 	/* 'debug_layer' [R/W] */
 	name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
 	entry =
 	    create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
 				   acpi_root_dir, acpi_system_read_debug,
 				   (void *)0);
 	if (entry)
 		entry->write_proc = acpi_system_write_debug;
 	else
 		goto Error;

 	/* 'debug_level' [R/W] */
 	name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
 	entry =
 	    create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
 				   acpi_root_dir, acpi_system_read_debug,
 				   (void *)1);
 	if (entry)
 		entry->write_proc = acpi_system_write_debug;
 	else
 		goto Error;

       Done:
 	return error;

       Error:
 	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
 	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
 	error = -ENODEV;
 	goto Done;
 #else
 	return 0;
 #endif
 }
	/*
	* debug.c - ACPI debug interface to userspace.
	*/

	#include <linux/proc_fs.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/moduleparam.h>
	#include <asm/uaccess.h>
	#include <acpi/acpi_drivers.h>

	#define _COMPONENT ACPI_SYSTEM_COMPONENT
	ACPI_MODULE_NAME("debug");

	struct acpi_dlayer {
	const char *name;
	unsigned long value;
	};
	struct acpi_dlevel {
	const char *name;
	unsigned long value;
	};
	#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }

	static const struct acpi_dlayer acpi_debug_layers[] = {
	ACPI_DEBUG_INIT(ACPI_UTILITIES),
	ACPI_DEBUG_INIT(ACPI_HARDWARE),
	ACPI_DEBUG_INIT(ACPI_EVENTS),
	ACPI_DEBUG_INIT(ACPI_TABLES),
	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
	ACPI_DEBUG_INIT(ACPI_PARSER),
	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
	ACPI_DEBUG_INIT(ACPI_EXECUTER),
	ACPI_DEBUG_INIT(ACPI_RESOURCES),
	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
	ACPI_DEBUG_INIT(ACPI_COMPILER),
	ACPI_DEBUG_INIT(ACPI_TOOLS),

	ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
	};

	static const struct acpi_dlevel acpi_debug_levels[] = {
	ACPI_DEBUG_INIT(ACPI_LV_INIT),
	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
	ACPI_DEBUG_INIT(ACPI_LV_INFO),

	ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
	ACPI_DEBUG_INIT(ACPI_LV_PARSE),
	ACPI_DEBUG_INIT(ACPI_LV_LOAD),
	ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
	ACPI_DEBUG_INIT(ACPI_LV_EXEC),
	ACPI_DEBUG_INIT(ACPI_LV_NAMES),
	ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
	ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
	ACPI_DEBUG_INIT(ACPI_LV_TABLES),
	ACPI_DEBUG_INIT(ACPI_LV_VALUES),
	ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
	ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
	ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
	ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),

	ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
	ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
	ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),

	ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
	ACPI_DEBUG_INIT(ACPI_LV_THREADS),
	ACPI_DEBUG_INIT(ACPI_LV_IO),
	ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),

	ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
	ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
	ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
	ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
	};

	/* --------------------------------------------------------------------------
	FS Interface (/sys)
	-------------------------------------------------------------------------- */
	static int param_get_debug_layer(char buffer, struct kernel_param kp) {
	int result = 0;
	int i;

	result = sprintf(buffer, "%-25s\tHex SET\n", "Description");

	for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
	result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_layers[i].name,
	acpi_debug_layers[i].value,
	(acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
	}
	result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
	ACPI_ALL_DRIVERS,
	(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
	ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
	ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
	result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);

	return result;
	}

	static int param_get_debug_level(char buffer, struct kernel_param kp) {
	int result = 0;
	int i;

	result = sprintf(buffer, "%-25s\tHex SET\n", "Description");

	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
	result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_levels[i].name,
	acpi_debug_levels[i].value,
	(acpi_dbg_level & acpi_debug_levels[i].
	value) ? '*' : ' ');
	}
	result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
	acpi_dbg_level);

	return result;
	}

	module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
	module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);

	static char trace_method_name[6];
	module_param_string(trace_method_name, trace_method_name, 6, 0644);
	static unsigned int trace_debug_layer;
	module_param(trace_debug_layer, uint, 0644);
	static unsigned int trace_debug_level;
	module_param(trace_debug_level, uint, 0644);

	static int param_set_trace_state(const char val, struct kernel_param kp)
	{
	int result = 0;

	if (!strncmp(val, "enable", strlen("enable") - 1)) {
	result = acpi_debug_trace(trace_method_name, trace_debug_level,
	trace_debug_layer, 0);
	if (result)
	result = -EBUSY;
	goto exit;
	}

	if (!strncmp(val, "disable", strlen("disable") - 1)) {
	int name = 0;
	result = acpi_debug_trace((char *)&name, trace_debug_level,
	trace_debug_layer, 0);
	if (result)
	result = -EBUSY;
	goto exit;
	}

	if (!strncmp(val, "1", 1)) {
	result = acpi_debug_trace(trace_method_name, trace_debug_level,
	trace_debug_layer, 1);
	if (result)
	result = -EBUSY;
	goto exit;
	}

	result = -EINVAL;
	exit:
	return result;
	}

	static int param_get_trace_state(char buffer, struct kernel_param kp)
	{
	if (!acpi_gbl_trace_method_name)
	return sprintf(buffer, "disable");
	else {
	if (acpi_gbl_trace_flags & 1)
	return sprintf(buffer, "1");
	else
	return sprintf(buffer, "enable");
	}
	return 0;
	}

	module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
	NULL, 0644);

	/* --------------------------------------------------------------------------
	FS Interface (/proc)
	-------------------------------------------------------------------------- */
	#ifdef CONFIG_ACPI_PROCFS
	#define ACPI_SYSTEM_FILE_DEBUG_LAYER "debug_layer"
	#define ACPI_SYSTEM_FILE_DEBUG_LEVEL "debug_level"

	static int
	acpi_system_read_debug(char *page,
	char *start, off_t off, int count, int eof, void *data)
	{
	char *p = page;
	int size = 0;
	unsigned int i;

	if (off != 0)
	goto end;

	p += sprintf(p, "%-25s\tHex SET\n", "Description");

	switch ((unsigned long)data) {
	case 0:
	for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
	p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_layers[i].name,
	acpi_debug_layers[i].value,
	(acpi_dbg_layer & acpi_debug_layers[i].
	value) ? '*' : ' ');
	}
	p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
	ACPI_ALL_DRIVERS,
	(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
	ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
	ACPI_ALL_DRIVERS) ==
	0 ? ' ' : '-');
	p += sprintf(p,
	"--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
	acpi_dbg_layer);
	break;
	case 1:
	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
	p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_levels[i].name,
	acpi_debug_levels[i].value,
	(acpi_dbg_level & acpi_debug_levels[i].
	value) ? '*' : ' ');
	}
	p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
	acpi_dbg_level);
	break;
	default:
	p += sprintf(p, "Invalid debug option\n");
	break;
	}

	end:
	size = (p - page);
	if (size <= off + count)
	*eof = 1;
	*start = page + off;
	size -= off;
	if (size > count)
	size = count;
	if (size < 0)
	size = 0;

	return size;
	}

	static int
	acpi_system_write_debug(struct file *file,
	const char __user * buffer,
	unsigned long count, void *data)
	{
	char debug_string[12] = { '\0' };


	if (count > sizeof(debug_string) - 1)
	return -EINVAL;

	if (copy_from_user(debug_string, buffer, count))
	return -EFAULT;

	debug_string[count] = '\0';

	switch ((unsigned long)data) {
	case 0:
	acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
	break;
	case 1:
	acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
	break;
	default:
	return -EINVAL;
	}

	return count;
	}
	#endif

	int __init acpi_debug_init(void)
	{
	#ifdef CONFIG_ACPI_PROCFS
	struct proc_dir_entry *entry;
	int error = 0;
	char *name;

	/* 'debug_layer' [R/W] */
	name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
	entry =
	create_proc_read_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	acpi_root_dir, acpi_system_read_debug,
	(void *)0);
	if (entry)
	entry->write_proc = acpi_system_write_debug;
	else
	goto Error;

	/* 'debug_level' [R/W] */
	name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
	entry =
	create_proc_read_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	acpi_root_dir, acpi_system_read_debug,
	(void *)1);
	if (entry)
	entry->write_proc = acpi_system_write_debug;
	else
	goto Error;

	Done:
	return error;

	Error:
	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
	error = -ENODEV;
	goto Done;
	#else
	return 0;
	#endif
	}