cm_sbs.c 3.2 KB

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  1. /*
  2. * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  3. *
  4. * This program is free software; you can redistribute it and/or modify
  5. * it under the terms of the GNU General Public License as published by
  6. * the Free Software Foundation; either version 2 of the License, or (at
  7. * your option) any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful, but
  10. * WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. * General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License along
  15. * with this program; if not, write to the Free Software Foundation, Inc.,
  16. * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17. *
  18. * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19. */
  20. #include <linux/kernel.h>
  21. #include <linux/module.h>
  22. #include <linux/init.h>
  23. #include <linux/acpi.h>
  24. #include <linux/types.h>
  25. #include <linux/proc_fs.h>
  26. #include <linux/seq_file.h>
  27. #include <acpi/acpi_bus.h>
  28. #include <acpi/acpi_drivers.h>
  29. #include <acpi/acmacros.h>
  30. #include <acpi/actypes.h>
  31. #include <acpi/acutils.h>
  32. ACPI_MODULE_NAME("cm_sbs");
  33. #define ACPI_AC_CLASS "ac_adapter"
  34. #define ACPI_BATTERY_CLASS "battery"
  35. #define ACPI_SBS_COMPONENT 0x00080000
  36. #define _COMPONENT ACPI_SBS_COMPONENT
  37. static struct proc_dir_entry *acpi_ac_dir;
  38. static struct proc_dir_entry *acpi_battery_dir;
  39. static DEFINE_MUTEX(cm_sbs_mutex);
  40. static int lock_ac_dir_cnt;
  41. static int lock_battery_dir_cnt;
  42. struct proc_dir_entry *acpi_lock_ac_dir(void)
  43. {
  44. mutex_lock(&cm_sbs_mutex);
  45. if (!acpi_ac_dir)
  46. acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
  47. if (acpi_ac_dir) {
  48. lock_ac_dir_cnt++;
  49. } else {
  50. ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  51. "Cannot create %s\n", ACPI_AC_CLASS));
  52. }
  53. mutex_unlock(&cm_sbs_mutex);
  54. return acpi_ac_dir;
  55. }
  56. EXPORT_SYMBOL(acpi_lock_ac_dir);
  57. void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
  58. {
  59. mutex_lock(&cm_sbs_mutex);
  60. if (acpi_ac_dir_param)
  61. lock_ac_dir_cnt--;
  62. if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
  63. remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
  64. acpi_ac_dir = NULL;
  65. }
  66. mutex_unlock(&cm_sbs_mutex);
  67. }
  68. EXPORT_SYMBOL(acpi_unlock_ac_dir);
  69. struct proc_dir_entry *acpi_lock_battery_dir(void)
  70. {
  71. mutex_lock(&cm_sbs_mutex);
  72. if (!acpi_battery_dir) {
  73. acpi_battery_dir =
  74. proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
  75. }
  76. if (acpi_battery_dir) {
  77. lock_battery_dir_cnt++;
  78. } else {
  79. ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  80. "Cannot create %s\n", ACPI_BATTERY_CLASS));
  81. }
  82. mutex_unlock(&cm_sbs_mutex);
  83. return acpi_battery_dir;
  84. }
  85. EXPORT_SYMBOL(acpi_lock_battery_dir);
  86. void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
  87. {
  88. mutex_lock(&cm_sbs_mutex);
  89. if (acpi_battery_dir_param)
  90. lock_battery_dir_cnt--;
  91. if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
  92. && acpi_battery_dir) {
  93. remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
  94. acpi_battery_dir = NULL;
  95. }
  96. mutex_unlock(&cm_sbs_mutex);
  97. return;
  98. }
  99. EXPORT_SYMBOL(acpi_unlock_battery_dir);
  100. static int __init acpi_cm_sbs_init(void)
  101. {
  102. return 0;
  103. }
  104. subsys_initcall(acpi_cm_sbs_init);