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leds-adsbitsy.c
Package: linux-2.4.20.tar.gz　[view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 1k
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Linux-Unix program

Development Platform:

Unix_Linux

leds-adsbitsy.c：Code Content
  1. /*
  2.  *  linux/arch/arm/mach-sa1100/leds-adsbitsy.c
  3.  *
  4.  * ADS Bitsy LED
  5.  * 7/25/01 Woojung Huh
  6.  */
  7. #include <linux/config.h>
  8. #include <linux/init.h>
  10. #include <asm/hardware.h>
  11. #include <asm/leds.h>
  12. #include <asm/system.h>
  14. #include "leds.h"
  17. #define LED_STATE_ENABLED 1
  18. #define LED_STATE_CLAIMED 2
  20. static unsigned int led_state;
  21. static unsigned int hw_led_state;
  23. #define LED_TIMER       GPIO_GPIO20  /* green heartbeat */
  25. #define LED_MASK (LED_TIMER)
  27. void adsbitsy_leds_event(led_event_t evt)
  28. {
  29. unsigned long flags;
  31. save_flags_cli(flags);
  33. switch (evt) {
  34. case led_start:
  35. hw_led_state = 0;        /* gc leds are positive logic */
  36. led_state = LED_STATE_ENABLED;
  37. break;
  39. case led_stop:
  40. led_state &= ~LED_STATE_ENABLED;
  41. break;
  43. case led_claim:
  44. led_state |= LED_STATE_CLAIMED;
  45. hw_led_state = LED_MASK;
  46. break;
  48. case led_release:
  49. led_state &= ~LED_STATE_CLAIMED;
  50. hw_led_state = LED_MASK;
  51. break;
  53. #ifdef CONFIG_LEDS_TIMER
  54. case led_timer:
  55. if (!(led_state & LED_STATE_CLAIMED))
  56. hw_led_state ^= LED_TIMER;
  57. break;
  58. #endif
  60. #ifdef CONFIG_LEDS_CPU
  61. case led_idle_start:
  62. break;
  64. case led_idle_end:
  65. break;
  66. #endif
  68. case led_green_on:
  69. break;
  71. case led_green_off:
  72. break;
  74. case led_amber_on:
  75. break;
  77. case led_amber_off:
  78. break;
  80. case led_red_on:
  81. break;
  83. case led_red_off:
  84. break;
  86. default:
  87. break;
  88. }
  90. if  (led_state & LED_STATE_ENABLED) {
  91. GPSR = hw_led_state;
  92. GPCR = hw_led_state ^ LED_MASK;
  93. }
  95. restore_flags(flags);
  96. }