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leds.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：3k
源码类别：

Linux/Unix编程

开发平台：

Unix_Linux

leds.c：源码内容
  1. /*
  2.  * arch/arm/kernel/leds-shark.c
  3.  * by Alexander Schulz
  4.  *
  5.  * derived from:
  6.  * arch/arm/kernel/leds-footbridge.c
  7.  * Copyright (C) 1998-1999 Russell King
  8.  *
  9.  * DIGITAL Shark LED control routines.
  10.  *
  11.  * The leds use is as follows:
  12.  *  - Green front - toggles state every 50 timer interrupts
  13.  *  - Amber front - Unused, this is a dual color led (Amber/Green)
  14.  *  - Amber back  - On if system is not idle
  15.  *
  16.  * Changelog:
  17.  */
  18. #include <linux/config.h>
  19. #include <linux/kernel.h>
  20. #include <linux/module.h>
  21. #include <linux/init.h>
  22. #include <linux/spinlock.h>
  23. #include <linux/ioport.h>
  25. #include <asm/hardware.h>
  26. #include <asm/leds.h>
  27. #include <asm/io.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 short hw_led_state;
  34. static short saved_state;
  36. static spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;
  38. short sequoia_read(int addr) {
  39.   outw(addr,0x24);
  40.   return inw(0x26);
  41. }
  43. void sequoia_write(short value,short addr) {
  44.   outw(addr,0x24);
  45.   outw(value,0x26);
  46. }
  48. static void sequoia_leds_event(led_event_t evt)
  49. {
  50. unsigned long flags;
  52. spin_lock_irqsave(&leds_lock, flags);
  54. hw_led_state = sequoia_read(0x09);
  56. switch (evt) {
  57. case led_start:
  58. hw_led_state |= SEQUOIA_LED_GREEN;
  59. hw_led_state |= SEQUOIA_LED_AMBER;
  60. #ifdef CONFIG_LEDS_CPU
  61. hw_led_state |= SEQUOIA_LED_BACK;
  62. #else
  63. hw_led_state &= ~SEQUOIA_LED_BACK;
  64. #endif
  65. led_state |= LED_STATE_ENABLED;
  66. break;
  68. case led_stop:
  69. hw_led_state &= ~SEQUOIA_LED_BACK;
  70. hw_led_state |= SEQUOIA_LED_GREEN;
  71. hw_led_state |= SEQUOIA_LED_AMBER;
  72. led_state &= ~LED_STATE_ENABLED;
  73. break;
  75. case led_claim:
  76. led_state |= LED_STATE_CLAIMED;
  77. saved_state = hw_led_state;
  78. hw_led_state &= ~SEQUOIA_LED_BACK;
  79. hw_led_state |= SEQUOIA_LED_GREEN;
  80. hw_led_state |= SEQUOIA_LED_AMBER;
  81. break;
  83. case led_release:
  84. led_state &= ~LED_STATE_CLAIMED;
  85. hw_led_state = saved_state;
  86. break;
  88. #ifdef CONFIG_LEDS_TIMER
  89. case led_timer:
  90. if (!(led_state & LED_STATE_CLAIMED))
  91. hw_led_state ^= SEQUOIA_LED_GREEN;
  92. break;
  93. #endif
  95. #ifdef CONFIG_LEDS_CPU
  96. case led_idle_start:
  97. if (!(led_state & LED_STATE_CLAIMED))
  98. hw_led_state &= ~SEQUOIA_LED_BACK;
  99. break;
  101. case led_idle_end:
  102. if (!(led_state & LED_STATE_CLAIMED))
  103. hw_led_state |= SEQUOIA_LED_BACK;
  104. break;
  105. #endif
  107. case led_green_on:
  108. if (led_state & LED_STATE_CLAIMED)
  109. hw_led_state &= ~SEQUOIA_LED_GREEN;
  110. break;
  112. case led_green_off:
  113. if (led_state & LED_STATE_CLAIMED)
  114. hw_led_state |= SEQUOIA_LED_GREEN;
  115. break;
  117. case led_amber_on:
  118. if (led_state & LED_STATE_CLAIMED)
  119. hw_led_state &= ~SEQUOIA_LED_AMBER;
  120. break;
  122. case led_amber_off:
  123. if (led_state & LED_STATE_CLAIMED)
  124. hw_led_state |= SEQUOIA_LED_AMBER;
  125. break;
  127. case led_red_on:
  128. if (led_state & LED_STATE_CLAIMED)
  129. hw_led_state |= SEQUOIA_LED_BACK;
  130. break;
  132. case led_red_off:
  133. if (led_state & LED_STATE_CLAIMED)
  134. hw_led_state &= ~SEQUOIA_LED_BACK;
  135. break;
  137. default:
  138. break;
  139. }
  141. if  (led_state & LED_STATE_ENABLED)
  142. sequoia_write(hw_led_state,0x09);
  144. spin_unlock_irqrestore(&leds_lock, flags);
  145. }
  147. static int __init leds_init(void)
  148. {
  149. extern void (*leds_event)(led_event_t);
  150. short temp;
  152. leds_event = sequoia_leds_event;
  154. /* Make LEDs independent of power-state */
  155. request_region(0x24,4,"sequoia");
  156. temp = sequoia_read(0x09);
  157. temp |= 1<<10;
  158. sequoia_write(temp,0x09);
  159. leds_event(led_start);
  160. return 0;
  161. }
  163. __initcall(leds_init);