[deliverable/linux.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("acpi_system")
#define ACPI_SYSTEM_CLASS		"system"
#define ACPI_SYSTEM_DRIVER_NAME		"ACPI System Driver"
#define ACPI_SYSTEM_DEVICE_NAME		"System"
#define ACPI_SYSTEM_FILE_INFO		"info"
#define ACPI_SYSTEM_FILE_EVENT		"event"
#define ACPI_SYSTEM_FILE_DSDT		"dsdt"
#define ACPI_SYSTEM_FILE_FADT		"fadt"
extern struct fadt_descriptor acpi_fadt;

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

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

	seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
	return_VALUE(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 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 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_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
	ssize_t res;

	ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");

	status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	res = simple_read_from_buffer(buffer, count, ppos,
				      dsdt.pointer, dsdt.length);
	acpi_os_free(dsdt.pointer);

	return_VALUE(res);
}

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

static 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_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
	ssize_t res;

	ACPI_FUNCTION_TRACE("acpi_system_read_fadt");

	status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	res = simple_read_from_buffer(buffer, count, ppos,
				      fadt.pointer, fadt.length);
	acpi_os_free(fadt.pointer);

	return_VALUE(res);
}

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

	ACPI_FUNCTION_TRACE("acpi_system_init");

	if (acpi_disabled)
		return_VALUE(0);

	/* '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_VALUE(error);

      Error:
	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
			  "Unable to create '%s' proc fs entry\n", name));

	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;
}

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
4be44fcd	34	ACPI_MODULE_NAME("acpi_system")
1da177e4 LT	35	#define ACPI_SYSTEM_CLASS "system"
	36	#define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver"
	37	#define ACPI_SYSTEM_DEVICE_NAME "System"
	38	#define ACPI_SYSTEM_FILE_INFO "info"
	39	#define ACPI_SYSTEM_FILE_EVENT "event"
	40	#define ACPI_SYSTEM_FILE_DSDT "dsdt"
	41	#define ACPI_SYSTEM_FILE_FADT "fadt"
793c2388	42	extern struct fadt_descriptor acpi_fadt;
1da177e4 LT	43
	44	/* --------------------------------------------------------------------------
	45	FS Interface (/proc)
	46	-------------------------------------------------------------------------- */
	47
4be44fcd	48	static int acpi_system_read_info(struct seq_file seq, void offset)
1da177e4 LT	49	{
	50	ACPI_FUNCTION_TRACE("acpi_system_read_info");
	51
	52	seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
	53	return_VALUE(0);
	54	}
	55
	56	static int acpi_system_info_open_fs(struct inode inode, struct file file)
	57	{
	58	return single_open(file, acpi_system_read_info, PDE(inode)->data);
	59	}
	60
	61	static struct file_operations acpi_system_info_ops = {
4be44fcd LB	62	.open = acpi_system_info_open_fs,
	63	.read = seq_read,
	64	.llseek = seq_lseek,
	65	.release = single_release,
1da177e4 LT	66	};
1da177e4 LT	67
4be44fcd LB	68	static ssize_t acpi_system_read_dsdt(struct file , char __user , size_t,
4be44fcd LB	69	loff_t *);
1da177e4 LT	70
1da177e4 LT	71	static struct file_operations acpi_system_dsdt_ops = {
4be44fcd	72	.read = acpi_system_read_dsdt,
1da177e4 LT	73	};
	74
	75	static ssize_t
4be44fcd LB	76	acpi_system_read_dsdt(struct file *file,
4be44fcd LB	77	char __user * buffer, size_t count, loff_t * ppos)
1da177e4	78	{
4be44fcd LB	79	acpi_status status = AE_OK;
	80	struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
	81	ssize_t res;
1da177e4 LT	82
	83	ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
	84
	85	status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
	86	if (ACPI_FAILURE(status))
	87	return_VALUE(-ENODEV);
	88
	89	res = simple_read_from_buffer(buffer, count, ppos,
	90	dsdt.pointer, dsdt.length);
	91	acpi_os_free(dsdt.pointer);
	92
	93	return_VALUE(res);
	94	}
	95
4be44fcd LB	96	static ssize_t acpi_system_read_fadt(struct file , char __user , size_t,
4be44fcd LB	97	loff_t *);
1da177e4 LT	98
1da177e4 LT	99	static struct file_operations acpi_system_fadt_ops = {
4be44fcd	100	.read = acpi_system_read_fadt,
1da177e4 LT	101	};
	102
	103	static ssize_t
4be44fcd LB	104	acpi_system_read_fadt(struct file *file,
4be44fcd LB	105	char __user * buffer, size_t count, loff_t * ppos)
1da177e4	106	{
4be44fcd LB	107	acpi_status status = AE_OK;
	108	struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
	109	ssize_t res;
1da177e4 LT	110
	111	ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
	112
	113	status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
	114	if (ACPI_FAILURE(status))
	115	return_VALUE(-ENODEV);
	116
	117	res = simple_read_from_buffer(buffer, count, ppos,
	118	fadt.pointer, fadt.length);
	119	acpi_os_free(fadt.pointer);
	120
	121	return_VALUE(res);
	122	}
	123
4be44fcd	124	static int __init acpi_system_init(void)
1da177e4	125	{
4be44fcd	126	struct proc_dir_entry *entry;
1da177e4	127	int error = 0;
4be44fcd	128	char *name;
1da177e4 LT	129
	130	ACPI_FUNCTION_TRACE("acpi_system_init");
	131
	132	if (acpi_disabled)
	133	return_VALUE(0);
	134
	135	/* 'info' [R] */
	136	name = ACPI_SYSTEM_FILE_INFO;
4be44fcd	137	entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
1da177e4 LT	138	if (!entry)
	139	goto Error;
	140	else {
	141	entry->proc_fops = &acpi_system_info_ops;
	142	}
	143
	144	/* 'dsdt' [R] */
	145	name = ACPI_SYSTEM_FILE_DSDT;
	146	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	147	if (entry)
	148	entry->proc_fops = &acpi_system_dsdt_ops;
4be44fcd	149	else
1da177e4 LT	150	goto Error;
	151
	152	/* 'fadt' [R] */
	153	name = ACPI_SYSTEM_FILE_FADT;
	154	entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
	155	if (entry)
	156	entry->proc_fops = &acpi_system_fadt_ops;
	157	else
	158	goto Error;
	159
4be44fcd	160	Done:
1da177e4 LT	161	return_VALUE(error);
1da177e4 LT	162
4be44fcd LB	163	Error:
	164	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	165	"Unable to create '%s' proc fs entry\n", name));
1da177e4 LT	166
	167	remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
	168	remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
	169	remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
	170
	171	error = -EFAULT;
	172	goto Done;
	173	}
	174
1da177e4	175	subsys_initcall(acpi_system_init);