[linux-2.6-block.git] / drivers / acpi / debug.c

/*
 * 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>
#include <acpi/acglobal.h>

#define _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("debug");

#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "acpi."

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),
};

static const struct acpi_dlevel acpi_debug_levels[] = {
	ACPI_DEBUG_INIT(ACPI_LV_ERROR),
	ACPI_DEBUG_INIT(ACPI_LV_WARN),
	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;
}

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


	if (acpi_disabled)
		return 0;

	/* '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;
}

subsys_initcall(acpi_debug_init);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* debug.c - ACPI debug interface to userspace.
	3	*/
	4
	5	#include <linux/proc_fs.h>
	6	#include <linux/init.h>
	7	#include <linux/module.h>
	8	#include <linux/kernel.h>
	9	#include <linux/moduleparam.h>
	10	#include <asm/uaccess.h>
	11	#include <acpi/acpi_drivers.h>
	12	#include <acpi/acglobal.h>
	13
	14	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	15	ACPI_MODULE_NAME("debug");
219c3c8e	16
1da177e4 LT	17	#ifdef MODULE_PARAM_PREFIX
	18	#undef MODULE_PARAM_PREFIX
	19	#endif
219c3c8e	20	#define MODULE_PARAM_PREFIX "acpi."
1da177e4 LT	21
	22	struct acpi_dlayer {
	23	const char *name;
	24	unsigned long value;
	25	};
	26	struct acpi_dlevel {
	27	const char *name;
	28	unsigned long value;
	29	};
	30	#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
	31
4be44fcd	32	static const struct acpi_dlayer acpi_debug_layers[] = {
1da177e4 LT	33	ACPI_DEBUG_INIT(ACPI_UTILITIES),
	34	ACPI_DEBUG_INIT(ACPI_HARDWARE),
	35	ACPI_DEBUG_INIT(ACPI_EVENTS),
	36	ACPI_DEBUG_INIT(ACPI_TABLES),
	37	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
	38	ACPI_DEBUG_INIT(ACPI_PARSER),
	39	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
	40	ACPI_DEBUG_INIT(ACPI_EXECUTER),
	41	ACPI_DEBUG_INIT(ACPI_RESOURCES),
	42	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
	43	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
	44	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
	45	ACPI_DEBUG_INIT(ACPI_COMPILER),
	46	ACPI_DEBUG_INIT(ACPI_TOOLS),
	47	};
	48
4be44fcd	49	static const struct acpi_dlevel acpi_debug_levels[] = {
1da177e4 LT	50	ACPI_DEBUG_INIT(ACPI_LV_ERROR),
	51	ACPI_DEBUG_INIT(ACPI_LV_WARN),
	52	ACPI_DEBUG_INIT(ACPI_LV_INIT),
	53	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
	54	ACPI_DEBUG_INIT(ACPI_LV_INFO),
	55
	56	ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
	57	ACPI_DEBUG_INIT(ACPI_LV_PARSE),
	58	ACPI_DEBUG_INIT(ACPI_LV_LOAD),
	59	ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
	60	ACPI_DEBUG_INIT(ACPI_LV_EXEC),
	61	ACPI_DEBUG_INIT(ACPI_LV_NAMES),
	62	ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
	63	ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
	64	ACPI_DEBUG_INIT(ACPI_LV_TABLES),
	65	ACPI_DEBUG_INIT(ACPI_LV_VALUES),
	66	ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
	67	ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
	68	ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
	69	ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
	70
	71	ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
	72	ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
	73	ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
	74
	75	ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
	76	ACPI_DEBUG_INIT(ACPI_LV_THREADS),
	77	ACPI_DEBUG_INIT(ACPI_LV_IO),
	78	ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
	79
	80	ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
	81	ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
	82	ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
4be44fcd	83	ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
1da177e4 LT	84	};
1da177e4 LT	85
219c3c8e ZR	86	/* --------------------------------------------------------------------------
	87	FS Interface (/sys)
	88	-------------------------------------------------------------------------- */
	89	static int param_get_debug_layer(char buffer, struct kernel_param kp) {
	90	int result = 0;
	91	int i;
	92
	93	result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
	94
	95	for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
	96	result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
	97	acpi_debug_layers[i].name,
	98	acpi_debug_layers[i].value,
	99	(acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
	100	}
	101	result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
	102	ACPI_ALL_DRIVERS,
	103	(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
	104	ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
	105	ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
	106	result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);
	107
	108	return result;
	109	}
	110
	111	static int param_get_debug_level(char buffer, struct kernel_param kp) {
	112	int result = 0;
	113	int i;
	114
	115	result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
	116
	117	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
	118	result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
	119	acpi_debug_levels[i].name,
	120	acpi_debug_levels[i].value,
	121	(acpi_dbg_level & acpi_debug_levels[i].
	122	value) ? '*' : ' ');
	123	}
	124	result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
	125	acpi_dbg_level);
	126
	127	return result;
	128	}
	129
	130	module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
	131	module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
	132
4169c45f ZR	133	static char trace_method_name[6];
	134	module_param_string(trace_method_name, trace_method_name, 6, 0644);
	135	static unsigned int trace_debug_layer;
	136	module_param(trace_debug_layer, uint, 0644);
	137	static unsigned int trace_debug_level;
	138	module_param(trace_debug_level, uint, 0644);
	139
	140	static int param_set_trace_state(const char val, struct kernel_param kp)
	141	{
	142	int result = 0;
	143
	144	if (!strncmp(val, "enable", strlen("enable") - 1)) {
	145	result = acpi_debug_trace(trace_method_name, trace_debug_level,
	146	trace_debug_layer, 0);
	147	if (result)
	148	result = -EBUSY;
	149	goto exit;
	150	}
	151
	152	if (!strncmp(val, "disable", strlen("disable") - 1)) {
	153	int name = 0;
	154	result = acpi_debug_trace((char *)&name, trace_debug_level,
	155	trace_debug_layer, 0);
	156	if (result)
	157	result = -EBUSY;
	158	goto exit;
	159	}
	160
	161	if (!strncmp(val, "1", 1)) {
	162	result = acpi_debug_trace(trace_method_name, trace_debug_level,
	163	trace_debug_layer, 1);
	164	if (result)
	165	result = -EBUSY;
	166	goto exit;
	167	}
	168
	169	result = -EINVAL;
	170	exit:
	171	return result;
	172	}
	173
	174	static int param_get_trace_state(char buffer, struct kernel_param kp)
	175	{
	176	if (!acpi_gbl_trace_method_name)
	177	return sprintf(buffer, "disable");
	178	else {
	179	if (acpi_gbl_trace_flags & 1)
	180	return sprintf(buffer, "1");
	181	else
	182	return sprintf(buffer, "enable");
	183	}
	184	return 0;
	185	}
	186
	187	module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
	188	NULL, 0644);
	189
219c3c8e ZR	190	/* --------------------------------------------------------------------------
	191	FS Interface (/proc)
	192	-------------------------------------------------------------------------- */
	193	#ifdef CONFIG_ACPI_PROCFS
	194	#define ACPI_SYSTEM_FILE_DEBUG_LAYER "debug_layer"
	195	#define ACPI_SYSTEM_FILE_DEBUG_LEVEL "debug_level"
	196
1da177e4	197	static int
4be44fcd LB	198	acpi_system_read_debug(char *page,
4be44fcd LB	199	char *start, off_t off, int count, int eof, void *data)
1da177e4	200	{
4be44fcd LB	201	char *p = page;
	202	int size = 0;
	203	unsigned int i;
1da177e4 LT	204
	205	if (off != 0)
	206	goto end;
	207
	208	p += sprintf(p, "%-25s\tHex SET\n", "Description");
	209
4be44fcd	210	switch ((unsigned long)data) {
1da177e4 LT	211	case 0:
	212	for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
	213	p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
4be44fcd LB	214	acpi_debug_layers[i].name,
	215	acpi_debug_layers[i].value,
	216	(acpi_dbg_layer & acpi_debug_layers[i].
	217	value) ? '*' : ' ');
1da177e4 LT	218	}
1da177e4 LT	219	p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
4be44fcd LB	220	ACPI_ALL_DRIVERS,
	221	(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
	222	ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
	223	ACPI_ALL_DRIVERS) ==
	224	0 ? ' ' : '-');
1da177e4	225	p += sprintf(p,
4be44fcd LB	226	"--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
4be44fcd LB	227	acpi_dbg_layer);
1da177e4 LT	228	break;
	229	case 1:
	230	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
	231	p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
4be44fcd LB	232	acpi_debug_levels[i].name,
	233	acpi_debug_levels[i].value,
	234	(acpi_dbg_level & acpi_debug_levels[i].
	235	value) ? '*' : ' ');
1da177e4 LT	236	}
1da177e4 LT	237	p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
4be44fcd	238	acpi_dbg_level);
1da177e4 LT	239	break;
	240	default:
	241	p += sprintf(p, "Invalid debug option\n");
	242	break;
	243	}
4be44fcd LB	244
4be44fcd LB	245	end:
1da177e4	246	size = (p - page);
4be44fcd LB	247	if (size <= off + count)
4be44fcd LB	248	*eof = 1;
1da177e4 LT	249	*start = page + off;
1da177e4 LT	250	size -= off;
4be44fcd LB	251	if (size > count)
	252	size = count;
	253	if (size < 0)
	254	size = 0;
1da177e4 LT	255
	256	return size;
	257	}
	258
1da177e4	259	static int
4be44fcd LB	260	acpi_system_write_debug(struct file *file,
	261	const char __user * buffer,
	262	unsigned long count, void *data)
1da177e4	263	{
4be44fcd	264	char debug_string[12] = { '\0' };
1da177e4	265
1da177e4 LT	266
1da177e4 LT	267	if (count > sizeof(debug_string) - 1)
d550d98d	268	return -EINVAL;
1da177e4 LT	269
1da177e4 LT	270	if (copy_from_user(debug_string, buffer, count))
d550d98d	271	return -EFAULT;
1da177e4 LT	272
	273	debug_string[count] = '\0';
	274
4be44fcd	275	switch ((unsigned long)data) {
1da177e4 LT	276	case 0:
	277	acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
	278	break;
	279	case 1:
	280	acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
	281	break;
	282	default:
d550d98d	283	return -EINVAL;
1da177e4 LT	284	}
1da177e4 LT	285
d550d98d	286	return count;
1da177e4 LT	287	}
	288
	289	static int __init acpi_debug_init(void)
	290	{
4be44fcd	291	struct proc_dir_entry *entry;
1da177e4	292	int error = 0;
4be44fcd	293	char *name;
1da177e4	294
1da177e4 LT	295
1da177e4 LT	296	if (acpi_disabled)
d550d98d	297	return 0;
1da177e4 LT	298
	299	/* 'debug_layer' [R/W] */
	300	name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
4be44fcd LB	301	entry =
	302	create_proc_read_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	303	acpi_root_dir, acpi_system_read_debug,
	304	(void *)0);
1da177e4 LT	305	if (entry)
	306	entry->write_proc = acpi_system_write_debug;
	307	else
	308	goto Error;
	309
	310	/* 'debug_level' [R/W] */
	311	name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
4be44fcd LB	312	entry =
	313	create_proc_read_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	314	acpi_root_dir, acpi_system_read_debug,
	315	(void *)1);
	316	if (entry)
1da177e4 LT	317	entry->write_proc = acpi_system_write_debug;
	318	else
	319	goto Error;
	320
4be44fcd	321	Done:
d550d98d	322	return error;
1da177e4	323
4be44fcd	324	Error:
1da177e4 LT	325	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
1da177e4 LT	326	remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
a6fc6720	327	error = -ENODEV;
1da177e4 LT	328	goto Done;
	329	}
	330
	331	subsys_initcall(acpi_debug_init);
219c3c8e	332	#endif