drivers/acpi/debug.c - kernel/skids - Git at Google

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

 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/moduleparam.h>
 #include <linux/debugfs.h>
 #include <linux/slab.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);

 /* --------------------------------------------------------------------------
 				DebugFS Interface
    -------------------------------------------------------------------------- */

 static ssize_t cm_write(struct file *file, const char __user *user_buf,
 			size_t count, loff_t *ppos)
 {
 	static char *buf;
 	static int uncopied_bytes;
 	struct acpi_table_header table;
 	acpi_status status;

 	if (!(*ppos)) {
 		/* parse the table header to get the table length */
 		if (count <= sizeof(struct acpi_table_header))
 			return -EINVAL;
 		if (copy_from_user(&table, user_buf,
 			sizeof(struct acpi_table_header)))
 			return -EFAULT;
 		uncopied_bytes = table.length;
 		buf = kzalloc(uncopied_bytes, GFP_KERNEL);
 		if (!buf)
 			return -ENOMEM;
 	}

 	if (uncopied_bytes < count) {
 		kfree(buf);
 		return -EINVAL;
 	}

 	if (copy_from_user(buf + (*ppos), user_buf, count)) {
 		kfree(buf);
 		return -EFAULT;
 	}

 	uncopied_bytes -= count;
 	*ppos += count;

 	if (!uncopied_bytes) {
 		status = acpi_install_method(buf);
 		kfree(buf);
 		if (ACPI_FAILURE(status))
 			return -EINVAL;
 		add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 	}

 	return count;
 }

 static const struct file_operations cm_fops = {
 	.write = cm_write,
 };

 static int acpi_debugfs_init(void)
 {
 	struct dentry *acpi_dir, *cm_dentry;

 	acpi_dir = debugfs_create_dir("acpi", NULL);
 	if (!acpi_dir)
 		goto err;

 	cm_dentry = debugfs_create_file("custom_method", S_IWUSR,
 					acpi_dir, NULL, &cm_fops);
 	if (!cm_dentry)
 		goto err;

 	return 0;

 err:
 	if (acpi_dir)
 		debugfs_remove(acpi_dir);
 	return -EINVAL;
 }

 /* --------------------------------------------------------------------------
                               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_debug_proc_show(struct seq_file *m, void *v)
 {
 	unsigned int i;

 	seq_printf(m, "%-25s\tHex        SET\n", "Description");

 	switch ((unsigned long)m->private) {
 	case 0:
 		for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 			seq_printf(m, "%-25s\t0x%08lX [%c]\n",
 				     acpi_debug_layers[i].name,
 				     acpi_debug_layers[i].value,
 				     (acpi_dbg_layer & acpi_debug_layers[i].
 				      value) ? '*' : ' ');
 		}
 		seq_printf(m, "%-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 ? ' ' : '-');
 		seq_printf(m,
 			     "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
 			     acpi_dbg_layer);
 		break;
 	case 1:
 		for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 			seq_printf(m, "%-25s\t0x%08lX [%c]\n",
 				     acpi_debug_levels[i].name,
 				     acpi_debug_levels[i].value,
 				     (acpi_dbg_level & acpi_debug_levels[i].
 				      value) ? '*' : ' ');
 		}
 		seq_printf(m, "--\ndebug_level = 0x%08X (* = enabled)\n",
 			     acpi_dbg_level);
 		break;
 	}
 	return 0;
 }

 static int acpi_system_debug_proc_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, acpi_system_debug_proc_show, PDE(inode)->data);
 }

 static ssize_t acpi_system_debug_proc_write(struct file *file,
 			const char __user * buffer,
 			size_t count, loff_t *pos)
 {
 	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)PDE(file->f_path.dentry->d_inode)->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;
 }

 static const struct file_operations acpi_system_debug_proc_fops = {
 	.owner		= THIS_MODULE,
 	.open		= acpi_system_debug_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= single_release,
 	.write		= acpi_system_debug_proc_write,
 };
 #endif

 int __init acpi_procfs_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 = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
 				 acpi_root_dir, &acpi_system_debug_proc_fops,
 				 (void *)0);
 	if (!entry)
 		goto Error;

 	/* 'debug_level' [R/W] */
 	name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
 	entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
 				 acpi_root_dir, &acpi_system_debug_proc_fops,
 				 (void *)1);
 	if (!entry)
 		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
 }

 int __init acpi_debug_init(void)
 {
 	acpi_debugfs_init();
 	acpi_procfs_init();
 	return 0;
 }
	/*
	* debug.c - ACPI debug interface to userspace.
	*/

	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/moduleparam.h>
	#include <linux/debugfs.h>
	#include <linux/slab.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);

	/* --------------------------------------------------------------------------
	DebugFS Interface
	-------------------------------------------------------------------------- */

	static ssize_t cm_write(struct file file, const char __user user_buf,
	size_t count, loff_t *ppos)
	{
	static char *buf;
	static int uncopied_bytes;
	struct acpi_table_header table;
	acpi_status status;

	if (!(*ppos)) {
	/* parse the table header to get the table length */
	if (count <= sizeof(struct acpi_table_header))
	return -EINVAL;
	if (copy_from_user(&table, user_buf,
	sizeof(struct acpi_table_header)))
	return -EFAULT;
	uncopied_bytes = table.length;
	buf = kzalloc(uncopied_bytes, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;
	}

	if (uncopied_bytes < count) {
	kfree(buf);
	return -EINVAL;
	}

	if (copy_from_user(buf + (*ppos), user_buf, count)) {
	kfree(buf);
	return -EFAULT;
	}

	uncopied_bytes -= count;
	*ppos += count;

	if (!uncopied_bytes) {
	status = acpi_install_method(buf);
	kfree(buf);
	if (ACPI_FAILURE(status))
	return -EINVAL;
	add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
	}

	return count;
	}

	static const struct file_operations cm_fops = {
	.write = cm_write,
	};

	static int acpi_debugfs_init(void)
	{
	struct dentry acpi_dir, cm_dentry;

	acpi_dir = debugfs_create_dir("acpi", NULL);
	if (!acpi_dir)
	goto err;

	cm_dentry = debugfs_create_file("custom_method", S_IWUSR,
	acpi_dir, NULL, &cm_fops);
	if (!cm_dentry)
	goto err;

	return 0;

	err:
	if (acpi_dir)
	debugfs_remove(acpi_dir);
	return -EINVAL;
	}

	/* --------------------------------------------------------------------------
	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_debug_proc_show(struct seq_file m, void v)
	{
	unsigned int i;

	seq_printf(m, "%-25s\tHex SET\n", "Description");

	switch ((unsigned long)m->private) {
	case 0:
	for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
	seq_printf(m, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_layers[i].name,
	acpi_debug_layers[i].value,
	(acpi_dbg_layer & acpi_debug_layers[i].
	value) ? '*' : ' ');
	}
	seq_printf(m, "%-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 ? ' ' : '-');
	seq_printf(m,
	"--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
	acpi_dbg_layer);
	break;
	case 1:
	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
	seq_printf(m, "%-25s\t0x%08lX [%c]\n",
	acpi_debug_levels[i].name,
	acpi_debug_levels[i].value,
	(acpi_dbg_level & acpi_debug_levels[i].
	value) ? '*' : ' ');
	}
	seq_printf(m, "--\ndebug_level = 0x%08X (* = enabled)\n",
	acpi_dbg_level);
	break;
	}
	return 0;
	}

	static int acpi_system_debug_proc_open(struct inode inode, struct file file)
	{
	return single_open(file, acpi_system_debug_proc_show, PDE(inode)->data);
	}

	static ssize_t acpi_system_debug_proc_write(struct file *file,
	const char __user * buffer,
	size_t count, loff_t *pos)
	{
	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)PDE(file->f_path.dentry->d_inode)->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;
	}

	static const struct file_operations acpi_system_debug_proc_fops = {
	.owner = THIS_MODULE,
	.open = acpi_system_debug_proc_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.write = acpi_system_debug_proc_write,
	};
	#endif

	int __init acpi_procfs_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 = proc_create_data(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	acpi_root_dir, &acpi_system_debug_proc_fops,
	(void *)0);
	if (!entry)
	goto Error;

	/* 'debug_level' [R/W] */
	name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
	entry = proc_create_data(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	acpi_root_dir, &acpi_system_debug_proc_fops,
	(void *)1);
	if (!entry)
	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
	}

	int __init acpi_debug_init(void)
	{
	acpi_debugfs_init();
	acpi_procfs_init();
	return 0;
	}