power.c 4.1 KB

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  1. /*
  2. * $Id: power.c,v 1.1.1.1 2007/06/12 07:27:09 eyryu Exp $
  3. *
  4. * Copyright (c) 2001 "Crazy" James Simmons
  5. *
  6. * Input driver Power Management.
  7. *
  8. * Sponsored by Transvirtual Technology.
  9. */
  10. /*
  11. * This program is free software; you can redistribute it and/or modify
  12. * it under the terms of the GNU General Public License as published by
  13. * the Free Software Foundation; either version 2 of the License, or
  14. * (at your option) any later version.
  15. *
  16. * This program is distributed in the hope that it will be useful,
  17. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19. * GNU General Public License for more details.
  20. *
  21. * You should have received a copy of the GNU General Public License
  22. * along with this program; if not, write to the Free Software
  23. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24. *
  25. * Should you need to contact me, the author, you can do so by
  26. * e-mail - mail your message to <jsimmons@transvirtual.com>.
  27. */
  28. #include <linux/module.h>
  29. #include <linux/input.h>
  30. #include <linux/slab.h>
  31. #include <linux/init.h>
  32. #include <linux/tty.h>
  33. #include <linux/delay.h>
  34. #include <linux/pm.h>
  35. static struct input_handler power_handler;
  36. /*
  37. * Power management can't be done in a interrupt context. So we have to
  38. * use keventd.
  39. */
  40. static int suspend_button_pushed = 0;
  41. static void suspend_button_task_handler(void *data)
  42. {
  43. udelay(200); /* debounce */
  44. suspend_button_pushed = 0;
  45. }
  46. static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL);
  47. static void power_event(struct input_handle *handle, unsigned int type,
  48. unsigned int code, int down)
  49. {
  50. struct input_dev *dev = handle->dev;
  51. printk("Entering power_event\n");
  52. if (type == EV_PWR) {
  53. switch (code) {
  54. case KEY_SUSPEND:
  55. printk("Powering down entire device\n");
  56. if (!suspend_button_pushed) {
  57. suspend_button_pushed = 1;
  58. schedule_work(&suspend_button_task);
  59. }
  60. break;
  61. case KEY_POWER:
  62. /* Hum power down the machine. */
  63. break;
  64. default:
  65. return;
  66. }
  67. }
  68. if (type == EV_KEY) {
  69. switch (code) {
  70. case KEY_SUSPEND:
  71. printk("Powering down input device\n");
  72. /* This is risky. See pm.h for details. */
  73. if (dev->state != PM_RESUME)
  74. dev->state = PM_RESUME;
  75. else
  76. dev->state = PM_SUSPEND;
  77. pm_send(dev->pm_dev, dev->state, dev);
  78. break;
  79. case KEY_POWER:
  80. /* Turn the input device off completely ? */
  81. break;
  82. default:
  83. return;
  84. }
  85. }
  86. return;
  87. }
  88. static struct input_handle *power_connect(struct input_handler *handler,
  89. struct input_dev *dev,
  90. const struct input_device_id *id)
  91. {
  92. struct input_handle *handle;
  93. if (!(handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL)))
  94. return NULL;
  95. handle->dev = dev;
  96. handle->handler = handler;
  97. input_open_device(handle);
  98. printk(KERN_INFO "power.c: Adding power management to input layer\n");
  99. return handle;
  100. }
  101. static void power_disconnect(struct input_handle *handle)
  102. {
  103. input_close_device(handle);
  104. kfree(handle);
  105. }
  106. static const struct input_device_id power_ids[] = {
  107. {
  108. .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
  109. .evbit = { BIT(EV_KEY) },
  110. .keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
  111. },
  112. {
  113. .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
  114. .evbit = { BIT(EV_KEY) },
  115. .keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
  116. },
  117. {
  118. .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
  119. .evbit = { BIT(EV_PWR) },
  120. },
  121. { }, /* Terminating entry */
  122. };
  123. MODULE_DEVICE_TABLE(input, power_ids);
  124. static struct input_handler power_handler = {
  125. .event = power_event,
  126. .connect = power_connect,
  127. .disconnect = power_disconnect,
  128. .name = "power",
  129. .id_table = power_ids,
  130. };
  131. static int __init power_init(void)
  132. {
  133. return input_register_handler(&power_handler);
  134. }
  135. static void __exit power_exit(void)
  136. {
  137. input_unregister_handler(&power_handler);
  138. }
  139. module_init(power_init);
  140. module_exit(power_exit);
  141. MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
  142. MODULE_DESCRIPTION("Input Power Management driver");
  143. MODULE_LICENSE("GPL");