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leds-idp.c
资源名称：SBC-2410X_kernel.tar.gz　[点击查看]
上传用户：lgb322
上传日期：2013-02-24
资源大小：30529k
文件大小：2k
源码类别：

嵌入式Linux

开发平台：

Unix_Linux

leds-idp.c：源码内容
  1. /*
  2.  * linux/arch/arm/mach-pxa/leds-idp.c
  3.  *
  4.  * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
  5.  *
  6.  * Copyright (c) 2001 Jeff Sutherland <jeffs@accelent.com>
  7.  *
  8.  * Original (leds-footbridge.c) by Russell King
  9.  * 
  10.  * Macros for actual LED manipulation should be in machine specific
  11.  * files in this 'mach' directory.
  12.  */
  15. #include <linux/config.h>
  16. #include <linux/init.h>
  18. #include <asm/hardware.h>
  19. #include <asm/leds.h>
  20. #include <asm/system.h>
  22. #include "leds.h"
  24. #define LED_STATE_ENABLED 1
  25. #define LED_STATE_CLAIMED 2
  27. static unsigned int led_state;
  28. static unsigned int hw_led_state;
  30. void idp_leds_event(led_event_t evt)
  31. {
  32. unsigned long flags;
  34. local_irq_save(flags);
  36. switch (evt) {
  37. case led_start:
  38. hw_led_state = IDP_HB_LED | IDP_BUSY_LED;
  39. led_state = LED_STATE_ENABLED;
  40. break;
  42. case led_stop:
  43. led_state &= ~LED_STATE_ENABLED;
  44. break;
  46. case led_claim:
  47. led_state |= LED_STATE_CLAIMED;
  48. hw_led_state = IDP_HB_LED | IDP_BUSY_LED;
  49. break;
  51. case led_release:
  52. led_state &= ~LED_STATE_CLAIMED;
  53. hw_led_state = IDP_HB_LED | IDP_BUSY_LED;
  54. break;
  56. #ifdef CONFIG_LEDS_TIMER
  57. case led_timer:
  58. if (!(led_state & LED_STATE_CLAIMED))
  59. hw_led_state ^= IDP_HB_LED;
  60. break;
  61. #endif
  63. #ifdef CONFIG_LEDS_CPU
  64. case led_idle_start:
  65. if (!(led_state & LED_STATE_CLAIMED))
  66. hw_led_state |= IDP_BUSY_LED;
  67. break;
  69. case led_idle_end:
  70. if (!(led_state & LED_STATE_CLAIMED))
  71. hw_led_state &= ~IDP_BUSY_LED;
  72. break;
  73. #endif
  75. case led_halted:
  76. break;
  78. case led_green_on:
  79. if (led_state & LED_STATE_CLAIMED)
  80. hw_led_state &= ~IDP_HB_LED;
  81. break;
  83. case led_green_off:
  84. if (led_state & LED_STATE_CLAIMED)
  85. hw_led_state |= IDP_HB_LED;
  86. break;
  88. case led_amber_on:
  89. break;
  91. case led_amber_off:
  92. break;
  94. case led_red_on:
  95. if (led_state & LED_STATE_CLAIMED)
  96. hw_led_state &= ~IDP_BUSY_LED;
  97. break;
  99. case led_red_off:
  100. if (led_state & LED_STATE_CLAIMED)
  101. hw_led_state |= IDP_BUSY_LED;
  102. break;
  104. default:
  105. break;
  106. }
  108. if  (led_state & LED_STATE_ENABLED)
  109. IDP_WRITE_LEDS(hw_led_state);
  111. local_irq_restore(flags);
  112. }