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leds-smdk.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-smdk.c：源码内容
  1. /*
  2.  * linux/arch/arm/mach-s3c2410/leds-smdk.c
  3.  *
  4.  * Based on linux/arch/arm/mach-sa1100/leds-assabet.c (by John Dorsey)
  5.  *
  6.  * Copyright (C) 2002 MIZI Research, Inc.
  7.  *
  8.  * Written by Janghoon Lyu <nandy@mizi.com>
  9.  */
  10. #include <linux/config.h>
  11. #include <linux/init.h>
  13. #include <asm/hardware.h>
  14. #include <asm/leds.h>
  15. #include <asm/system.h>
  16. #include <asm/arch/smdk.h>
  18. #include "leds.h"
  20. #define LED_STATE_ENABLED 1
  21. #define LED_STATE_CLAIMED 2
  23. #define LED0 (1 << 0)
  24. #define LED1 (1 << 1)
  25. #define LED2 (1 << 2)
  26. #define LED3 (1 << 3)
  28. static unsigned int led_state;
  29. static unsigned int hw_led_state;
  31. static inline void
  32. led_update(unsigned int state)
  33. {
  34. #if 0
  35. GPFDAT &= ~(0xf << 4);
  36. GPFDAT |= (state << 4);
  37. #else
  38. write_gpio_bit(GPIO_LED1, (state & LED0));
  39. write_gpio_bit(GPIO_LED2, ((state & LED1) >> 1));
  40. write_gpio_bit(GPIO_LED3, ((state & LED2) >> 2));
  41. write_gpio_bit(GPIO_LED4, ((state & LED3) >> 3));
  42. #endif
  43. }
  45. void
  46. smdk_leds_event(led_event_t evt)
  47. {
  48. unsigned long flags;
  50. local_irq_save(flags);
  52. switch (evt) {
  53. case led_start:
  54. hw_led_state = (LED1 | LED2 | LED3);
  55. led_state = LED_STATE_ENABLED;
  56. break;
  58. case led_stop:
  59. led_state &= ~LED_STATE_ENABLED;
  60. hw_led_state = (LED0 | LED1 | LED2 | LED3);
  61. led_update(hw_led_state);
  62. break;
  64. case led_claim:
  65. led_state |= LED_STATE_CLAIMED;
  66. hw_led_state = (LED0 | LED1 | LED2 | LED3);
  67. break;
  69. case led_release:
  70. led_state &= ~LED_STATE_CLAIMED;
  71. hw_led_state = (LED1 | LED2 | LED3);
  72. break;
  74. #ifdef CONFIG_LEDS_TIMER
  75. case led_timer:
  76. if (!(led_state & LED_STATE_CLAIMED))
  77. hw_led_state ^= LED3;
  78. break;
  79. #endif
  81. #ifdef CONFIG_LEDS_CPU
  82. case led_idle_start:
  83. if (!(led_state & LED_STATE_CLAIMED))
  84. hw_led_state |= LED2;
  85. break;
  87. case led_idle_end:
  88. if (!(led_state & LED_STATE_CLAIMED))
  89. hw_led_state &= ~LED2;
  90. break;
  91. #endif
  93. case led_halted:
  94. break;
  96. case led_green_on:
  97. if (led_state & LED_STATE_CLAIMED)
  98. hw_led_state &= ~LED2;
  99. break;
  101. case led_green_off:
  102. if (led_state & LED_STATE_CLAIMED)
  103. hw_led_state |= LED2;
  104. break;
  106. case led_amber_on:
  107. break;
  109. case led_amber_off:
  110. break;
  112. case led_red_on:
  113. break;
  115. case led_red_off:
  116. break;
  118. default:
  119. break;
  120. }
  122. if (led_state & LED_STATE_ENABLED)
  123. led_update(hw_led_state);
  125. local_irq_restore(flags);
  126. }