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ebsa285-leds.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

ebsa285-leds.c：源码内容
  1. /*
  2.  *  linux/arch/arm/mach-footbridge/ebsa285-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.  * EBSA-285 control routines.
  10.  *
  11.  * The EBSA-285 uses the leds as follows:
  12.  *  - Green - toggles state every 50 timer interrupts
  13.  *  - Amber - On if system is not idle
  14.  *  - Red   - currently unused
  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;
  37. static void ebsa285_leds_event(led_event_t evt)
  38. {
  39. unsigned long flags;
  41. spin_lock_irqsave(&leds_lock, flags);
  43. switch (evt) {
  44. case led_start:
  45. hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
  46. #ifndef CONFIG_LEDS_CPU
  47. hw_led_state |= XBUS_LED_AMBER;
  48. #endif
  49. led_state |= LED_STATE_ENABLED;
  50. break;
  52. case led_stop:
  53. led_state &= ~LED_STATE_ENABLED;
  54. break;
  56. case led_claim:
  57. led_state |= LED_STATE_CLAIMED;
  58. hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  59. break;
  61. case led_release:
  62. led_state &= ~LED_STATE_CLAIMED;
  63. hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  64. break;
  66. #ifdef CONFIG_LEDS_TIMER
  67. case led_timer:
  68. if (!(led_state & LED_STATE_CLAIMED))
  69. hw_led_state ^= XBUS_LED_GREEN;
  70. break;
  71. #endif
  73. #ifdef CONFIG_LEDS_CPU
  74. case led_idle_start:
  75. if (!(led_state & LED_STATE_CLAIMED))
  76. hw_led_state |= XBUS_LED_AMBER;
  77. break;
  79. case led_idle_end:
  80. if (!(led_state & LED_STATE_CLAIMED))
  81. hw_led_state &= ~XBUS_LED_AMBER;
  82. break;
  83. #endif
  85. case led_halted:
  86. if (!(led_state & LED_STATE_CLAIMED))
  87. hw_led_state &= ~XBUS_LED_RED;
  88. break;
  90. case led_green_on:
  91. if (led_state & LED_STATE_CLAIMED)
  92. hw_led_state &= ~XBUS_LED_GREEN;
  93. break;
  95. case led_green_off:
  96. if (led_state & LED_STATE_CLAIMED)
  97. hw_led_state |= XBUS_LED_GREEN;
  98. break;
  100. case led_amber_on:
  101. if (led_state & LED_STATE_CLAIMED)
  102. hw_led_state &= ~XBUS_LED_AMBER;
  103. break;
  105. case led_amber_off:
  106. if (led_state & LED_STATE_CLAIMED)
  107. hw_led_state |= XBUS_LED_AMBER;
  108. break;
  110. case led_red_on:
  111. if (led_state & LED_STATE_CLAIMED)
  112. hw_led_state &= ~XBUS_LED_RED;
  113. break;
  115. case led_red_off:
  116. if (led_state & LED_STATE_CLAIMED)
  117. hw_led_state |= XBUS_LED_RED;
  118. break;
  120. default:
  121. break;
  122. }
  124. if  (led_state & LED_STATE_ENABLED)
  125. *XBUS_LEDS = hw_led_state;
  127. spin_unlock_irqrestore(&leds_lock, flags);
  128. }
  130. static int __init leds_init(void)
  131. {
  132. if (machine_is_ebsa285() || machine_is_co285())
  133. leds_event = ebsa285_leds_event;
  135. leds_event(led_start);
  137. return 0;
  138. }
  140. __initcall(leds_init);