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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.parent = &acpi_subsys.kobj;
      kobject_set_name(&tables_kobj, "tables");
      result = kobject_register(&tables_kobj);
      if (result)
            return result;

      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);

      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);

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