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leds-cerf.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：3k
源码类别：

嵌入式Linux

开发平台：

Unix_Linux

leds-cerf.c：源码内容
  1. /*
  2.  *  linux/arch/arm/mach-pxa/leds-cerf.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.  *  This program is free software; you can redistribute it and/or modify
  11.  *  it under the terms of the GNU General Public License version 2 as
  12.  *  published by the Free Software Foundation.
  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 pxa_cerf_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 = CERF_HEARTBEAT_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 = CERF_HEARTBEAT_LED;
  51. break;
  53. case led_release:
  54. led_state &= ~LED_STATE_CLAIMED;
  55. hw_led_state = CERF_HEARTBEAT_LED;
  56. break;
  58. #ifdef CONFIG_LEDS_TIMER
  59. case led_timer:
  60. if (!(led_state & LED_STATE_CLAIMED))
  61. hw_led_state ^= CERF_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 |= CERF_SYS_BUSY_LED;
  69. break;
  71. case led_idle_end:
  72. if (!(led_state & LED_STATE_CLAIMED))
  73. hw_led_state &= ~CERF_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 &= ~CERF_HEARTBEAT_LED;
  83. break;
  85. case led_green_off:
  86. if (led_state & LED_STATE_CLAIMED)
  87. hw_led_state |= CERF_HEARTBEAT_LED;
  88. break;
  90. case led_amber_on:
  91. break;
  93. case led_amber_off:
  94. break;
  96. #ifndef CONFIG_PXA_CERF_PDA
  97. case led_red_on:
  98. if (led_state & LED_STATE_CLAIMED)
  99. hw_led_state &= ~CERF_SYS_BUSY_LED;
  100. break;
  102. case led_red_off:
  103. if (led_state & LED_STATE_CLAIMED)
  104. hw_led_state |= CERF_SYS_BUSY_LED;
  105. break;
  106. #endif
  107. default:
  108. break;
  109. }
  111. if  (led_state & LED_STATE_ENABLED)
  112. {
  113. switch (hw_led_state) {
  114. case 0: // all on
  115. CERF_HEARTBEAT_LED_ON;
  116. CERF_SYS_BUSY_LED_ON;
  117. break;
  118. case 1: // turn off heartbeat, status on:
  119. CERF_HEARTBEAT_LED_OFF;
  120. CERF_SYS_BUSY_LED_ON;
  121. break;
  122. case 2: // status off, heartbeat on:
  123. CERF_HEARTBEAT_LED_ON;
  124. CERF_SYS_BUSY_LED_OFF;
  125. break;
  126. case 3: // turn them both off...
  127. CERF_HEARTBEAT_LED_OFF;
  128. CERF_SYS_BUSY_LED_OFF;
  129. break;
  130. default:
  131. break;
  132. }
  133. }
  134. local_irq_restore(flags);
  135. }