drivers/misc/status_led.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2003
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <status_led.h>
   9
  10 /*
  11  * The purpose of this code is to signal the operational status of a
  12  * target which usually boots over the network; while running in
  13  * U-Boot, a status LED is blinking. As soon as a valid BOOTP reply
  14  * message has been received, the LED is turned off. The Linux
  15  * kernel, once it is running, will start blinking the LED again,
  16  * with another frequency.
  17  */
  18
  19 /* ------------------------------------------------------------------------- */
  20
  21 typedef struct {
  22         led_id_t mask;
  23         int state;
  24         int period;
  25         int cnt;
  26 } led_dev_t;
  27
  28 led_dev_t led_dev[] = {
  29         {       CONFIG_LED_STATUS_BIT,
  30                 CONFIG_LED_STATUS_STATE,
  31                 LED_STATUS_PERIOD,
  32                 0,
  33         },
  34 #if defined(CONFIG_LED_STATUS1)
  35         {       CONFIG_LED_STATUS_BIT1,
  36                 CONFIG_LED_STATUS_STATE1,
  37                 LED_STATUS_PERIOD1,
  38                 0,
  39         },
  40 #endif
  41 #if defined(CONFIG_LED_STATUS2)
  42         {       CONFIG_LED_STATUS_BIT2,
  43                 CONFIG_LED_STATUS_STATE2,
  44                 LED_STATUS_PERIOD2,
  45                 0,
  46         },
  47 #endif
  48 #if defined(CONFIG_LED_STATUS3)
  49         {       CONFIG_LED_STATUS_BIT3,
  50                 CONFIG_LED_STATUS_STATE3,
  51                 LED_STATUS_PERIOD3,
  52                 0,
  53         },
  54 #endif
  55 #if defined(CONFIG_LED_STATUS4)
  56         {       CONFIG_LED_STATUS_BIT4,
  57                 CONFIG_LED_STATUS_STATE4,
  58                 LED_STATUS_PERIOD4,
  59                 0,
  60         },
  61 #endif
  62 #if defined(CONFIG_LED_STATUS5)
  63         {       CONFIG_LED_STATUS_BIT5,
  64                 CONFIG_LED_STATUS_STATE5,
  65                 LED_STATUS_PERIOD5,
  66                 0,
  67         },
  68 #endif
  69 };
  70
  71 #define MAX_LED_DEV     (sizeof(led_dev)/sizeof(led_dev_t))
  72
  73 static int status_led_init_done = 0;
  74
  75 void status_led_init(void)
  76 {
  77         led_dev_t *ld;
  78         int i;
  79
  80         for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++)
  81                 __led_init (ld->mask, ld->state);
  82         status_led_init_done = 1;
  83 }
  84
  85 void status_led_tick (ulong timestamp)
  86 {
  87         led_dev_t *ld;
  88         int i;
  89
  90         if (!status_led_init_done)
  91                 status_led_init ();
  92
  93         for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
  94
  95                 if (ld->state != CONFIG_LED_STATUS_BLINKING)
  96                         continue;
  97
  98                 if (++ld->cnt >= ld->period) {
  99                         __led_toggle (ld->mask);
 100                         ld->cnt -= ld->period;
 101                 }
 102
 103         }
 104 }
 105
 106 void status_led_set (int led, int state)
 107 {
 108         led_dev_t *ld;
 109
 110         if (led < 0 || led >= MAX_LED_DEV)
 111                 return;
 112
 113         if (!status_led_init_done)
 114                 status_led_init ();
 115
 116         ld = &led_dev[led];
 117
 118         ld->state = state;
 119         if (state == CONFIG_LED_STATUS_BLINKING) {
 120                 ld->cnt = 0;            /* always start with full period    */
 121                 state = CONFIG_LED_STATUS_ON;   /* always start with LED _ON_ */
 122         }
 123         __led_set (ld->mask, state);
 124 }