drivers/acpi/ec_sys.c

   1 #include <linux/kernel.h>
   2 #include <linux/acpi.h>
   3 #include <linux/debugfs.h>
   4 #include "internal.h"
   5
   6 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
   7 MODULE_DESCRIPTION("ACPI EC sysfs access driver");
   8 MODULE_LICENSE("GPL");
   9
  10 struct sysdev_class acpi_ec_sysdev_class = {
  11         .name = "ec",
  12 };
  13
  14 static struct dentry *acpi_ec_debugfs_dir;
  15
  16 int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
  17 {
  18         struct dentry *dev_dir;
  19         char name[64];
  20         if (ec_device_count == 0) {
  21                 acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
  22                 if (!acpi_ec_debugfs_dir)
  23                         return -ENOMEM;
  24         }
  25
  26         sprintf(name, "ec%u", ec_device_count);
  27         dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
  28         if (!dev_dir) {
  29                 if (ec_device_count == 0)
  30                         debugfs_remove_recursive(acpi_ec_debugfs_dir);
  31                 /* TBD: Proper cleanup for multiple ECs */
  32                 return -ENOMEM;
  33         }
  34
  35         debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
  36         debugfs_create_bool("use_global_lock", 0444, dev_dir,
  37                             (u32 *)&first_ec->global_lock);
  38         return 0;
  39 }
  40
  41 static int __init acpi_ec_sys_init(void)
  42 {
  43         int err = 0;
  44         if (first_ec)
  45                 err = acpi_ec_add_debugfs(first_ec, 0);
  46         else
  47                 err = -ENODEV;
  48         return err;
  49 }
  50
  51 static void __exit acpi_ec_sys_exit(void)
  52 {
  53         debugfs_remove_recursive(acpi_ec_debugfs_dir);
  54 }
  55
  56 module_init(acpi_ec_sys_init);
  57 module_exit(acpi_ec_sys_exit);