apm-power.c 2.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Input Power Event -> APM Bridge
  4. *
  5. * Copyright (c) 2007 Richard Purdie
  6. */
  7. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8. #include <linux/module.h>
  9. #include <linux/input.h>
  10. #include <linux/slab.h>
  11. #include <linux/init.h>
  12. #include <linux/tty.h>
  13. #include <linux/delay.h>
  14. #include <linux/pm.h>
  15. #include <linux/apm-emulation.h>
  16. static void system_power_event(unsigned int keycode)
  17. {
  18. switch (keycode) {
  19. case KEY_SUSPEND:
  20. apm_queue_event(APM_USER_SUSPEND);
  21. pr_info("Requesting system suspend...\n");
  22. break;
  23. default:
  24. break;
  25. }
  26. }
  27. static void apmpower_event(struct input_handle *handle, unsigned int type,
  28. unsigned int code, int value)
  29. {
  30. /* only react on key down events */
  31. if (value != 1)
  32. return;
  33. switch (type) {
  34. case EV_PWR:
  35. system_power_event(code);
  36. break;
  37. default:
  38. break;
  39. }
  40. }
  41. static int apmpower_connect(struct input_handler *handler,
  42. struct input_dev *dev,
  43. const struct input_device_id *id)
  44. {
  45. struct input_handle *handle;
  46. int error;
  47. handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
  48. if (!handle)
  49. return -ENOMEM;
  50. handle->dev = dev;
  51. handle->handler = handler;
  52. handle->name = "apm-power";
  53. error = input_register_handle(handle);
  54. if (error) {
  55. pr_err("Failed to register input power handler, error %d\n",
  56. error);
  57. kfree(handle);
  58. return error;
  59. }
  60. error = input_open_device(handle);
  61. if (error) {
  62. pr_err("Failed to open input power device, error %d\n", error);
  63. input_unregister_handle(handle);
  64. kfree(handle);
  65. return error;
  66. }
  67. return 0;
  68. }
  69. static void apmpower_disconnect(struct input_handle *handle)
  70. {
  71. input_close_device(handle);
  72. input_unregister_handle(handle);
  73. kfree(handle);
  74. }
  75. static const struct input_device_id apmpower_ids[] = {
  76. {
  77. .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
  78. .evbit = { BIT_MASK(EV_PWR) },
  79. },
  80. { },
  81. };
  82. MODULE_DEVICE_TABLE(input, apmpower_ids);
  83. static struct input_handler apmpower_handler = {
  84. .event = apmpower_event,
  85. .connect = apmpower_connect,
  86. .disconnect = apmpower_disconnect,
  87. .name = "apm-power",
  88. .id_table = apmpower_ids,
  89. };
  90. static int __init apmpower_init(void)
  91. {
  92. return input_register_handler(&apmpower_handler);
  93. }
  94. static void __exit apmpower_exit(void)
  95. {
  96. input_unregister_handler(&apmpower_handler);
  97. }
  98. module_init(apmpower_init);
  99. module_exit(apmpower_exit);
  100. MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
  101. MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
  102. MODULE_LICENSE("GPL");