[mirror_ubuntu-kernels.git] / drivers / acpi / system.c

/*
 *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <asm/uaccess.h>

#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("system");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "acpi."

#define ACPI_SYSTEM_CLASS		"system"
#define ACPI_SYSTEM_DEVICE_NAME		"System"

/*
 * Make ACPICA version work as module param
 */
static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
{
	int result;

	result = sprintf(buffer, "%x", ACPI_CA_VERSION);

	return result;
}

module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);

/* --------------------------------------------------------------------------
                              FS Interface (/sys)
   -------------------------------------------------------------------------- */
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;

struct acpi_table_attr {
	struct bin_attribute attr;
	char name[8];
	int instance;
	struct list_head node;
};

static ssize_t acpi_table_show(struct kobject *kobj,
			       struct bin_attribute *bin_attr, char *buf,
			       loff_t offset, size_t count)
{
	struct acpi_table_attr *table_attr =
	    container_of(bin_attr, struct acpi_table_attr, attr);
	struct acpi_table_header *table_header = NULL;
	acpi_status status;
	ssize_t ret_count = count;

	status =
	    acpi_get_table(table_attr->name, table_attr->instance,
			   &table_header);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	if (offset >= table_header->length) {
		ret_count = 0;
		goto end;
	}

	if (offset + ret_count > table_header->length)
		ret_count = table_header->length - offset;

	memcpy(buf, ((char *)table_header) + offset, ret_count);

      end:
	return ret_count;
}

static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
				 struct acpi_table_header *table_header)
{
	struct acpi_table_header *header = NULL;
	struct acpi_table_attr *attr = NULL;

	memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);

	list_for_each_entry(attr, &acpi_table_attr_list, node) {
		if (!memcmp(table_header->signature, attr->name,
			    ACPI_NAME_SIZE))
			if (table_attr->instance < attr->instance)
				table_attr->instance = attr->instance;
	}
	table_attr->instance++;

	if (table_attr->instance > 1 || (table_attr->instance == 1 &&
					 !acpi_get_table(table_header->
							 signature, 2,
							 &header)))
		sprintf(table_attr->name + 4, "%d", table_attr->instance);

	table_attr->attr.size = 0;
	table_attr->attr.read = acpi_table_show;
	table_attr->attr.attr.name = table_attr->name;
	table_attr->attr.attr.mode = 0444;
	table_attr->attr.attr.owner = THIS_MODULE;

	return;
}

static int acpi_system_sysfs_init(void)
{
	struct acpi_table_attr *table_attr;
	struct acpi_table_header *table_header = NULL;
	int table_index = 0;
	int result;

	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
	if (!tables_kobj)
		return -ENOMEM;

	do {
		result = acpi_get_table_by_index(table_index, &table_header);
		if (!result) {
			table_index++;
			table_attr = NULL;
			table_attr =
			    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
			if (!table_attr)
				return -ENOMEM;

			acpi_table_attr_init(table_attr, table_header);
			result =
			    sysfs_create_bin_file(tables_kobj,
						  &table_attr->attr);
			if (result) {
				kfree(table_attr);
				return result;
			} else
				list_add_tail(&table_attr->node,
					      &acpi_table_attr_list);
		}
	} while (!result);
	kobject_uevent(tables_kobj, KOBJ_ADD);

	return 0;
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS
#define ACPI_SYSTEM_FILE_INFO		"info"
#define ACPI_SYSTEM_FILE_EVENT		"event"
#define ACPI_SYSTEM_FILE_DSDT		"dsdt"
#define ACPI_SYSTEM_FILE_FADT		"fadt"

static int acpi_system_read_info(struct seq_file *seq, void *offset)
{

	seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
	return 0;
}

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

static const struct file_operations acpi_system_info_ops = {
	.open = acpi_system_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
				     loff_t *);

static const struct file_operations acpi_system_dsdt_ops = {
	.read = acpi_system_read_dsdt,
};

static ssize_t
acpi_system_read_dsdt(struct file *file,
		      char __user * buffer, size_t count, loff_t * ppos)
{
	acpi_status status = AE_OK;
	struct acpi_table_header *dsdt = NULL;
	ssize_t res;

	status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);

	return res;
}

static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
				     loff_t *);

static const struct file_operations acpi_system_fadt_ops = {
	.read = acpi_system_read_fadt,
};

static ssize_t
acpi_system_read_fadt(struct file *file,
		      char __user * buffer, size_t count, loff_t * ppos)
{
	acpi_status status = AE_OK;
	struct acpi_table_header *fadt = NULL;
	ssize_t res;

	status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);

	return res;
}

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

	/* 'info' [R] */
	name = ACPI_SYSTEM_FILE_INFO;
	entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
	if (!entry)
		goto Error;
	else {
		entry->proc_fops = &acpi_system_info_ops;
	}

	/* 'dsdt' [R] */
	name = ACPI_SYSTEM_FILE_DSDT;
	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_dsdt_ops;
	else
		goto Error;

	/* 'fadt' [R] */
	name = ACPI_SYSTEM_FILE_FADT;
	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_fadt_ops;
	else
		goto Error;

      Done:
	return error;

      Error:
	remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
	remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
	remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);

	error = -EFAULT;
	goto Done;
}
#else
static int acpi_system_procfs_init(void)
{
	return 0;
}
#endif

static int __init acpi_system_init(void)
{
	int result = 0;

	if (acpi_disabled)
		return 0;

	result = acpi_system_procfs_init();
	if (result)
		return result;

	result = acpi_system_sysfs_init();

	return result;
}

subsys_initcall(acpi_system_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* acpi_system.c - ACPI System Driver ($Revision: 63 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	22	*
	23	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	24	*/
	25
	26	#include <linux/proc_fs.h>
	27	#include <linux/seq_file.h>
	28	#include <linux/init.h>
	29	#include <asm/uaccess.h>
	30
	31	#include <acpi/acpi_drivers.h>
	32
1da177e4	33	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	34	ACPI_MODULE_NAME("system");
5bb730fd ZR	35	#ifdef MODULE_PARAM_PREFIX
	36	#undef MODULE_PARAM_PREFIX
	37	#endif
	38	#define MODULE_PARAM_PREFIX "acpi."
	39
1da177e4	40	#define ACPI_SYSTEM_CLASS "system"
1da177e4	41	#define ACPI_SYSTEM_DEVICE_NAME "System"
1da177e4	42
5bb730fd ZR	43	/*
	44	* Make ACPICA version work as module param
	45	*/
d4c5f047 ZR	46	static int param_get_acpica_version(char buffer, struct kernel_param kp)
d4c5f047 ZR	47	{
5bb730fd ZR	48	int result;
	49
	50	result = sprintf(buffer, "%x", ACPI_CA_VERSION);
	51
	52	return result;
	53	}
	54
	55	module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
	56
d4c5f047 ZR	57	/* --------------------------------------------------------------------------
	58	FS Interface (/sys)
	59	-------------------------------------------------------------------------- */
	60	static LIST_HEAD(acpi_table_attr_list);
a77aa28a	61	static struct kobject *tables_kobj;
d4c5f047 ZR	62
	63	struct acpi_table_attr {
	64	struct bin_attribute attr;
	65	char name[8];
	66	int instance;
	67	struct list_head node;
	68	};
	69
	70	static ssize_t acpi_table_show(struct kobject *kobj,
	71	struct bin_attribute bin_attr, char buf,
	72	loff_t offset, size_t count)
	73	{
	74	struct acpi_table_attr *table_attr =
	75	container_of(bin_attr, struct acpi_table_attr, attr);
	76	struct acpi_table_header *table_header = NULL;
	77	acpi_status status;
	78	ssize_t ret_count = count;
	79
	80	status =
	81	acpi_get_table(table_attr->name, table_attr->instance,
	82	&table_header);
	83	if (ACPI_FAILURE(status))
	84	return -ENODEV;
	85
	86	if (offset >= table_header->length) {
	87	ret_count = 0;
	88	goto end;
	89	}
	90
	91	if (offset + ret_count > table_header->length)
	92	ret_count = table_header->length - offset;
	93
	94	memcpy(buf, ((char *)table_header) + offset, ret_count);
	95
	96	end:
	97	return ret_count;
	98	}
	99
	100	static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
	101	struct acpi_table_header *table_header)
	102	{
	103	struct acpi_table_header *header = NULL;
	104	struct acpi_table_attr *attr = NULL;
	105
	106	memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
	107
	108	list_for_each_entry(attr, &acpi_table_attr_list, node) {
	109	if (!memcmp(table_header->signature, attr->name,
	110	ACPI_NAME_SIZE))
	111	if (table_attr->instance < attr->instance)
	112	table_attr->instance = attr->instance;
	113	}
	114	table_attr->instance++;
	115
	116	if (table_attr->instance > 1 \|\| (table_attr->instance == 1 &&
	117	!acpi_get_table(table_header->
	118	signature, 2,
	119	&header)))
	120	sprintf(table_attr->name + 4, "%d", table_attr->instance);
	121
	122	table_attr->attr.size = 0;
	123	table_attr->attr.read = acpi_table_show;
	124	table_attr->attr.attr.name = table_attr->name;
	125	table_attr->attr.attr.mode = 0444;
126	table_attr->attr.attr.owner = THIS_MODULE;
127
128	return;
129	}
130
131	static int acpi_system_sysfs_init(void)
132	{
133	struct acpi_table_attr *table_attr;
134	struct acpi_table_header *table_header = NULL;
135	int table_index = 0;
136	int result;
137
a77aa28a GKH	138	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
	139	if (!tables_kobj)
	140	return -ENOMEM;
d4c5f047 ZR	141
	142	do {
	143	result = acpi_get_table_by_index(table_index, &table_header);
	144	if (!result) {
	145	table_index++;
	146	table_attr = NULL;
	147	table_attr =
	148	kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
	149	if (!table_attr)
	150	return -ENOMEM;
	151
	152	acpi_table_attr_init(table_attr, table_header);
	153	result =
a77aa28a	154	sysfs_create_bin_file(tables_kobj,
d4c5f047 ZR	155	&table_attr->attr);
	156	if (result) {
	157	kfree(table_attr);
	158	return result;
	159	} else
	160	list_add_tail(&table_attr->node,
	161	&acpi_table_attr_list);
	162	}
	163	} while (!result);
a77aa28a	164	kobject_uevent(tables_kobj, KOBJ_ADD);
d4c5f047 ZR	165
	166	return 0;
	167	}
	168
1da177e4 LT	169	/* --------------------------------------------------------------------------
	170	FS Interface (/proc)
	171	-------------------------------------------------------------------------- */
5bb730fd	172	#ifdef CONFIG_ACPI_PROCFS
d4c5f047 ZR	173	#define ACPI_SYSTEM_FILE_INFO "info"
	174	#define ACPI_SYSTEM_FILE_EVENT "event"
	175	#define ACPI_SYSTEM_FILE_DSDT "dsdt"
	176	#define ACPI_SYSTEM_FILE_FADT "fadt"
1da177e4	177
4be44fcd	178	static int acpi_system_read_info(struct seq_file seq, void offset)
1da177e4	179	{
1da177e4 LT	180
1da177e4 LT	181	seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
d550d98d	182	return 0;
1da177e4 LT	183	}
	184
	185	static int acpi_system_info_open_fs(struct inode inode, struct file file)
	186	{
	187	return single_open(file, acpi_system_read_info, PDE(inode)->data);
	188	}
	189
d7508032	190	static const struct file_operations acpi_system_info_ops = {
4be44fcd LB	191	.open = acpi_system_info_open_fs,
	192	.read = seq_read,
	193	.llseek = seq_lseek,
	194	.release = single_release,
1da177e4 LT	195	};
1da177e4 LT	196
4be44fcd LB	197	static ssize_t acpi_system_read_dsdt(struct file , char __user , size_t,
4be44fcd LB	198	loff_t *);
1da177e4	199
d7508032	200	static const struct file_operations acpi_system_dsdt_ops = {
4be44fcd	201	.read = acpi_system_read_dsdt,
1da177e4 LT	202	};
	203
	204	static ssize_t
4be44fcd LB	205	acpi_system_read_dsdt(struct file *file,
4be44fcd LB	206	char __user * buffer, size_t count, loff_t * ppos)
1da177e4	207	{
4be44fcd	208	acpi_status status = AE_OK;
ad71860a	209	struct acpi_table_header *dsdt = NULL;
4be44fcd	210	ssize_t res;
1da177e4	211
ad71860a	212	status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
1da177e4	213	if (ACPI_FAILURE(status))
d550d98d	214	return -ENODEV;
1da177e4	215
d4c5f047	216	res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
1da177e4	217
d550d98d	218	return res;
1da177e4 LT	219	}
1da177e4 LT	220
4be44fcd LB	221	static ssize_t acpi_system_read_fadt(struct file , char __user , size_t,
4be44fcd LB	222	loff_t *);
1da177e4	223
d7508032	224	static const struct file_operations acpi_system_fadt_ops = {
4be44fcd	225	.read = acpi_system_read_fadt,
1da177e4 LT	226	};
	227
	228	static ssize_t
4be44fcd LB	229	acpi_system_read_fadt(struct file *file,
4be44fcd LB	230	char __user * buffer, size_t count, loff_t * ppos)
1da177e4	231	{
4be44fcd	232	acpi_status status = AE_OK;
ad71860a	233	struct acpi_table_header *fadt = NULL;
4be44fcd	234	ssize_t res;
1da177e4	235
ad71860a	236	status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
1da177e4	237	if (ACPI_FAILURE(status))
d550d98d	238	return -ENODEV;
1da177e4	239
d4c5f047	240	res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
1da177e4	241
d550d98d	242	return res;
1da177e4 LT	243	}
1da177e4 LT	244
d4c5f047	245	static int acpi_system_procfs_init(void)
1da177e4	246	{
4be44fcd	247	struct proc_dir_entry *entry;
1da177e4	248	int error = 0;
4be44fcd	249	char *name;
1da177e4	250
1da177e4 LT	251	/* 'info' [R] */
1da177e4 LT	252	name = ACPI_SYSTEM_FILE_INFO;
4be44fcd	253	entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
1da177e4 LT	254	if (!entry)
	255	goto Error;
	256	else {
	257	entry->proc_fops = &acpi_system_info_ops;
	258	}
	259
	260	/* 'dsdt' [R] */
	261	name = ACPI_SYSTEM_FILE_DSDT;
	262	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	263	if (entry)
	264	entry->proc_fops = &acpi_system_dsdt_ops;
4be44fcd	265	else
1da177e4 LT	266	goto Error;
	267
	268	/* 'fadt' [R] */
	269	name = ACPI_SYSTEM_FILE_FADT;
	270	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	271	if (entry)
	272	entry->proc_fops = &acpi_system_fadt_ops;
	273	else
	274	goto Error;
	275
4be44fcd	276	Done:
d550d98d	277	return error;
1da177e4	278
4be44fcd	279	Error:
1da177e4 LT	280	remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
	281	remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
	282	remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
	283
	284	error = -EFAULT;
	285	goto Done;
	286	}
d4c5f047 ZR	287	#else
	288	static int acpi_system_procfs_init(void)
	289	{
	290	return 0;
	291	}
	292	#endif
	293
	294	static int __init acpi_system_init(void)
	295	{
	296	int result = 0;
	297
	298	if (acpi_disabled)
	299	return 0;
	300
	301	result = acpi_system_procfs_init();
	302	if (result)
	303	return result;
	304
	305	result = acpi_system_sysfs_init();
	306
	307	return result;
	308	}
1da177e4	309
1da177e4	310	subsys_initcall(acpi_system_init);