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leds-lubbock.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-lubbock.c：源码内容
  1. /*
  2.  * linux/arch/arm/mach-pxa/leds-lubbock.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.  * See leds.h for bit definitions.  The first version defines D28 on the
  11.  * Lubbock dev board as the heartbeat, and D27 as the Sys_busy led.
  12.  * There's plenty more if you're interested in adding them :)
  13.  */
  16. #include <linux/config.h>
  17. #include <linux/init.h>
  19. #include <asm/hardware.h>
  20. #include <asm/leds.h>
  21. #include <asm/system.h>
  23. #include "leds.h"
  26. #define LED_STATE_ENABLED 1
  27. #define LED_STATE_CLAIMED 2
  29. static unsigned int led_state;
  30. static unsigned int hw_led_state;
  32. void lubbock_leds_event(led_event_t evt)
  33. {
  34. unsigned long flags;
  36. local_irq_save(flags);
  38. switch (evt) {
  39. case led_start:
  40. hw_led_state = HEARTBEAT_LED | SYS_BUSY_LED;
  41. led_state = LED_STATE_ENABLED;
  42. break;
  44. case led_stop:
  45. led_state &= ~LED_STATE_ENABLED;
  46. break;
  48. case led_claim:
  49. led_state |= LED_STATE_CLAIMED;
  50. hw_led_state = HEARTBEAT_LED | SYS_BUSY_LED;
  51. break;
  53. case led_release:
  54. led_state &= ~LED_STATE_CLAIMED;
  55. hw_led_state = HEARTBEAT_LED | SYS_BUSY_LED;
  56. break;
  58. #ifdef CONFIG_LEDS_TIMER
  59. case led_timer:
  60. if (!(led_state & LED_STATE_CLAIMED))
  61. hw_led_state ^= HEARTBEAT_LED;
  62. break;
  63. #endif
  65. #ifdef CONFIG_LEDS_CPU
  66. case led_idle_start:
  67. if (!(led_state & LED_STATE_CLAIMED))
  68. hw_led_state |= SYS_BUSY_LED;
  69. break;
  71. case led_idle_end:
  72. if (!(led_state & LED_STATE_CLAIMED))
  73. hw_led_state &= ~SYS_BUSY_LED;
  74. break;
  75. #endif
  77. case led_halted:
  78. break;
  80. case led_green_on:
  81. if (led_state & LED_STATE_CLAIMED)
  82. hw_led_state &= ~HEARTBEAT_LED;
  83. break;
  85. case led_green_off:
  86. if (led_state & LED_STATE_CLAIMED)
  87. hw_led_state |= HEARTBEAT_LED;
  88. break;
  90. case led_amber_on:
  91. break;
  93. case led_amber_off:
  94. break;
  96. case led_red_on:
  97. if (led_state & LED_STATE_CLAIMED)
  98. hw_led_state &= ~SYS_BUSY_LED;
  99. break;
  101. case led_red_off:
  102. if (led_state & LED_STATE_CLAIMED)
  103. hw_led_state |= SYS_BUSY_LED;
  104. break;
  106. default:
  107. break;
  108. }
  110. if  (led_state & LED_STATE_ENABLED)
  111. {
  112. switch (hw_led_state) {
  113. case 0: // all on
  114. HEARTBEAT_LED_ON;
  115. SYS_BUSY_LED_ON;
  116. break;
  117. case 1: // turn off heartbeat, status on:
  118. HEARTBEAT_LED_OFF;
  119. SYS_BUSY_LED_ON;
  120. break;
  121. case 2: // status off, heartbeat on:
  122. HEARTBEAT_LED_ON;
  123. SYS_BUSY_LED_OFF;
  124. break;
  125. case 3: // turn them both off...
  126. HEARTBEAT_LED_OFF;
  127. SYS_BUSY_LED_OFF;
  128. break;
  129. default:
  130. break;
  131. }
  132. }
  133. local_irq_restore(flags);
  134. }