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leds-assabet.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：2k
源码类别：

Linux/Unix编程

开发平台：

Unix_Linux

leds-assabet.c：源码内容
  1. /*
  2.  * linux/arch/arm/mach-sa1100/leds-assabet.c
  3.  *
  4.  * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
  5.  *
  6.  * Original (leds-footbridge.c) by Russell King
  7.  *
  8.  * Assabet uses the LEDs as follows:
  9.  *   - Green - toggles state every 50 timer interrupts
  10.  *   - Red   - on if system is not idle
  11.  */
  12. #include <linux/config.h>
  13. #include <linux/init.h>
  15. #include <asm/hardware.h>
  16. #include <asm/leds.h>
  17. #include <asm/system.h>
  18. #include <asm/arch/assabet.h>
  20. #include "leds.h"
  23. #define LED_STATE_ENABLED 1
  24. #define LED_STATE_CLAIMED 2
  26. static unsigned int led_state;
  27. static unsigned int hw_led_state;
  29. #define ASSABET_BCR_LED_MASK (ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED)
  31. void assabet_leds_event(led_event_t evt)
  32. {
  33. unsigned long flags;
  35. local_irq_save(flags);
  37. switch (evt) {
  38. case led_start:
  39. hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  40. led_state = LED_STATE_ENABLED;
  41. break;
  43. case led_stop:
  44. led_state &= ~LED_STATE_ENABLED;
  45. hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  46. ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
  47. break;
  49. case led_claim:
  50. led_state |= LED_STATE_CLAIMED;
  51. hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  52. break;
  54. case led_release:
  55. led_state &= ~LED_STATE_CLAIMED;
  56. hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  57. break;
  59. #ifdef CONFIG_LEDS_TIMER
  60. case led_timer:
  61. if (!(led_state & LED_STATE_CLAIMED))
  62. hw_led_state ^= ASSABET_BCR_LED_GREEN;
  63. break;
  64. #endif
  66. #ifdef CONFIG_LEDS_CPU
  67. case led_idle_start:
  68. if (!(led_state & LED_STATE_CLAIMED))
  69. hw_led_state |= ASSABET_BCR_LED_RED;
  70. break;
  72. case led_idle_end:
  73. if (!(led_state & LED_STATE_CLAIMED))
  74. hw_led_state &= ~ASSABET_BCR_LED_RED;
  75. break;
  76. #endif
  78. case led_halted:
  79. break;
  81. case led_green_on:
  82. if (led_state & LED_STATE_CLAIMED)
  83. hw_led_state &= ~ASSABET_BCR_LED_GREEN;
  84. break;
  86. case led_green_off:
  87. if (led_state & LED_STATE_CLAIMED)
  88. hw_led_state |= ASSABET_BCR_LED_GREEN;
  89. break;
  91. case led_amber_on:
  92. break;
  94. case led_amber_off:
  95. break;
  97. case led_red_on:
  98. if (led_state & LED_STATE_CLAIMED)
  99. hw_led_state &= ~ASSABET_BCR_LED_RED;
  100. break;
  102. case led_red_off:
  103. if (led_state & LED_STATE_CLAIMED)
  104. hw_led_state |= ASSABET_BCR_LED_RED;
  105. break;
  107. default:
  108. break;
  109. }
  111. if  (led_state & LED_STATE_ENABLED)
  112. ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
  114. local_irq_restore(flags);
  115. }