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netwinder-leds.c
资源名称：linux-2.4.20.tar.gz　[点击查看]
上传用户：jlfgdled
上传日期：2013-04-10
资源大小：33168k
文件大小：3k
源码类别：

Linux/Unix编程

开发平台：

Unix_Linux

netwinder-leds.c：源码内容
  1. /*
  2.  *  linux/arch/arm/mach-footbridge/netwinder-leds.c
  3.  *
  4.  *  Copyright (C) 1998-1999 Russell King
  5.  *
  6.  * This program is free software; you can redistribute it and/or modify
  7.  * it under the terms of the GNU General Public License version 2 as
  8.  * published by the Free Software Foundation.
  9.  *
  10.  * NetWinder LED control routines.
  11.  *
  12.  * The Netwinder uses the leds as follows:
  13.  *  - Green - toggles state every 50 timer interrupts
  14.  *  - Red   - On if the system is not idle
  15.  *
  16.  * Changelog:
  17.  *   02-05-1999 RMK Various cleanups
  18.  */
  19. #include <linux/config.h>
  20. #include <linux/module.h>
  21. #include <linux/kernel.h>
  22. #include <linux/init.h>
  23. #include <linux/spinlock.h>
  25. #include <asm/hardware.h>
  26. #include <asm/leds.h>
  27. #include <asm/mach-types.h>
  28. #include <asm/system.h>
  30. #define LED_STATE_ENABLED 1
  31. #define LED_STATE_CLAIMED 2
  32. static char led_state;
  33. static char hw_led_state;
  35. static spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;
  36. extern spinlock_t gpio_lock;
  38. static void netwinder_leds_event(led_event_t evt)
  39. {
  40. unsigned long flags;
  42. spin_lock_irqsave(&leds_lock, flags);
  44. switch (evt) {
  45. case led_start:
  46. led_state |= LED_STATE_ENABLED;
  47. hw_led_state = GPIO_GREEN_LED;
  48. break;
  50. case led_stop:
  51. led_state &= ~LED_STATE_ENABLED;
  52. break;
  54. case led_claim:
  55. led_state |= LED_STATE_CLAIMED;
  56. hw_led_state = 0;
  57. break;
  59. case led_release:
  60. led_state &= ~LED_STATE_CLAIMED;
  61. hw_led_state = 0;
  62. break;
  64. #ifdef CONFIG_LEDS_TIMER
  65. case led_timer:
  66. if (!(led_state & LED_STATE_CLAIMED))
  67. hw_led_state ^= GPIO_GREEN_LED;
  68. break;
  69. #endif
  71. #ifdef CONFIG_LEDS_CPU
  72. case led_idle_start:
  73. if (!(led_state & LED_STATE_CLAIMED))
  74. hw_led_state &= ~GPIO_RED_LED;
  75. break;
  77. case led_idle_end:
  78. if (!(led_state & LED_STATE_CLAIMED))
  79. hw_led_state |= GPIO_RED_LED;
  80. break;
  81. #endif
  83. case led_halted:
  84. if (!(led_state & LED_STATE_CLAIMED))
  85. hw_led_state |= GPIO_RED_LED;
  86. break;
  88. case led_green_on:
  89. if (led_state & LED_STATE_CLAIMED)
  90. hw_led_state |= GPIO_GREEN_LED;
  91. break;
  93. case led_green_off:
  94. if (led_state & LED_STATE_CLAIMED)
  95. hw_led_state &= ~GPIO_GREEN_LED;
  96. break;
  98. case led_amber_on:
  99. if (led_state & LED_STATE_CLAIMED)
  100. hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
  101. break;
  103. case led_amber_off:
  104. if (led_state & LED_STATE_CLAIMED)
  105. hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
  106. break;
  108. case led_red_on:
  109. if (led_state & LED_STATE_CLAIMED)
  110. hw_led_state |= GPIO_RED_LED;
  111. break;
  113. case led_red_off:
  114. if (led_state & LED_STATE_CLAIMED)
  115. hw_led_state &= ~GPIO_RED_LED;
  116. break;
  118. default:
  119. break;
  120. }
  122. spin_unlock_irqrestore(&leds_lock, flags);
  124. if  (led_state & LED_STATE_ENABLED) {
  125. spin_lock_irqsave(&gpio_lock, flags);
  126. gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
  127. spin_unlock_irqrestore(&gpio_lock, flags);
  128. }
  129. }
  131. static int __init leds_init(void)
  132. {
  133. if (machine_is_netwinder())
  134. leds_event = netwinder_leds_event;
  136. leds_event(led_start);
  138. return 0;
  139. }
  141. __initcall(leds_init);