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d4c5f047ae
The file name is the signature, such as DSDT, and the contents are the binary table image. Some tables, such as the SSDT, can have multiple instances. If just one, the file is SSDT, but if 3 instances, for example, it will be SSDT1, SSDT2, SSDT3 All static tables (besides teh RSDP and RSDT themselves are exported. Dynamic tables, such as SSDT op-regions that are not declared in the RSDT, will be added in a subsequent patch. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
312 lines
7.8 KiB
C
312 lines
7.8 KiB
C
/*
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* acpi_system.c - ACPI System Driver ($Revision: 63 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("system");
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#ifdef MODULE_PARAM_PREFIX
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#undef MODULE_PARAM_PREFIX
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#endif
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#define MODULE_PARAM_PREFIX "acpi."
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#define ACPI_SYSTEM_CLASS "system"
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#define ACPI_SYSTEM_DEVICE_NAME "System"
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/*
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* Make ACPICA version work as module param
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*/
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static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
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{
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int result;
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result = sprintf(buffer, "%x", ACPI_CA_VERSION);
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return result;
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}
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module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
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/* --------------------------------------------------------------------------
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FS Interface (/sys)
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-------------------------------------------------------------------------- */
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static LIST_HEAD(acpi_table_attr_list);
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static struct kobject tables_kobj;
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struct acpi_table_attr {
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struct bin_attribute attr;
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char name[8];
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int instance;
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struct list_head node;
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};
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static ssize_t acpi_table_show(struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t offset, size_t count)
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{
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struct acpi_table_attr *table_attr =
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container_of(bin_attr, struct acpi_table_attr, attr);
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struct acpi_table_header *table_header = NULL;
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acpi_status status;
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ssize_t ret_count = count;
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status =
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acpi_get_table(table_attr->name, table_attr->instance,
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&table_header);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (offset >= table_header->length) {
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ret_count = 0;
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goto end;
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}
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if (offset + ret_count > table_header->length)
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ret_count = table_header->length - offset;
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memcpy(buf, ((char *)table_header) + offset, ret_count);
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end:
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return ret_count;
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}
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static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
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struct acpi_table_header *table_header)
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{
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struct acpi_table_header *header = NULL;
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struct acpi_table_attr *attr = NULL;
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memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
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list_for_each_entry(attr, &acpi_table_attr_list, node) {
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if (!memcmp(table_header->signature, attr->name,
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ACPI_NAME_SIZE))
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if (table_attr->instance < attr->instance)
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table_attr->instance = attr->instance;
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}
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table_attr->instance++;
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if (table_attr->instance > 1 || (table_attr->instance == 1 &&
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!acpi_get_table(table_header->
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signature, 2,
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&header)))
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sprintf(table_attr->name + 4, "%d", table_attr->instance);
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table_attr->attr.size = 0;
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table_attr->attr.read = acpi_table_show;
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table_attr->attr.attr.name = table_attr->name;
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table_attr->attr.attr.mode = 0444;
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table_attr->attr.attr.owner = THIS_MODULE;
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return;
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}
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static int acpi_system_sysfs_init(void)
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{
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struct acpi_table_attr *table_attr;
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struct acpi_table_header *table_header = NULL;
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int table_index = 0;
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int result;
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tables_kobj.parent = &acpi_subsys.kobj;
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kobject_set_name(&tables_kobj, "tables");
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result = kobject_register(&tables_kobj);
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if (result)
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return result;
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do {
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result = acpi_get_table_by_index(table_index, &table_header);
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if (!result) {
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table_index++;
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table_attr = NULL;
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table_attr =
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kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
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if (!table_attr)
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return -ENOMEM;
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acpi_table_attr_init(table_attr, table_header);
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result =
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sysfs_create_bin_file(&tables_kobj,
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&table_attr->attr);
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if (result) {
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kfree(table_attr);
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return result;
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} else
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list_add_tail(&table_attr->node,
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&acpi_table_attr_list);
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}
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} while (!result);
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return 0;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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#ifdef CONFIG_ACPI_PROCFS
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#define ACPI_SYSTEM_FILE_INFO "info"
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#define ACPI_SYSTEM_FILE_EVENT "event"
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#define ACPI_SYSTEM_FILE_DSDT "dsdt"
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#define ACPI_SYSTEM_FILE_FADT "fadt"
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static int acpi_system_read_info(struct seq_file *seq, void *offset)
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{
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seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
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return 0;
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}
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static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_read_info, PDE(inode)->data);
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}
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static const struct file_operations acpi_system_info_ops = {
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.open = acpi_system_info_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_dsdt_ops = {
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.read = acpi_system_read_dsdt,
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};
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static ssize_t
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acpi_system_read_dsdt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *dsdt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
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return res;
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}
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static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_fadt_ops = {
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.read = acpi_system_read_fadt,
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};
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static ssize_t
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acpi_system_read_fadt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *fadt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
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return res;
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}
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static int acpi_system_procfs_init(void)
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{
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struct proc_dir_entry *entry;
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int error = 0;
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char *name;
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/* 'info' [R] */
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name = ACPI_SYSTEM_FILE_INFO;
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entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
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if (!entry)
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goto Error;
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else {
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entry->proc_fops = &acpi_system_info_ops;
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}
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/* 'dsdt' [R] */
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name = ACPI_SYSTEM_FILE_DSDT;
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entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
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if (entry)
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entry->proc_fops = &acpi_system_dsdt_ops;
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else
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goto Error;
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/* 'fadt' [R] */
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name = ACPI_SYSTEM_FILE_FADT;
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entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
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if (entry)
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entry->proc_fops = &acpi_system_fadt_ops;
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else
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goto Error;
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Done:
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return error;
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Error:
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remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
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error = -EFAULT;
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goto Done;
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}
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#else
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static int acpi_system_procfs_init(void)
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{
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return 0;
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}
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#endif
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static int __init acpi_system_init(void)
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{
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int result = 0;
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if (acpi_disabled)
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return 0;
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result = acpi_system_procfs_init();
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if (result)
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return result;
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result = acpi_system_sysfs_init();
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return result;
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}
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subsys_initcall(acpi_system_init);
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