u-boot/drivers/misc/status_led.c
Stefan Roese a8eeaf2f7a cmd_led: Extend led command to support blinking and more leds
This patch extends the U-Boot "led" command to support automatic blinking
by setting a blink frequency in milliseconds. Additionally the number of
supported LEDs is increased to 6 (0...5).

This will be used by the PCA9551 LED driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
2015-04-23 09:43:08 -04:00

125 lines
2.3 KiB
C

/*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <status_led.h>
/*
* The purpose of this code is to signal the operational status of a
* target which usually boots over the network; while running in
* U-Boot, a status LED is blinking. As soon as a valid BOOTP reply
* message has been received, the LED is turned off. The Linux
* kernel, once it is running, will start blinking the LED again,
* with another frequency.
*/
/* ------------------------------------------------------------------------- */
typedef struct {
led_id_t mask;
int state;
int period;
int cnt;
} led_dev_t;
led_dev_t led_dev[] = {
{ STATUS_LED_BIT,
STATUS_LED_STATE,
STATUS_LED_PERIOD,
0,
},
#if defined(STATUS_LED_BIT1)
{ STATUS_LED_BIT1,
STATUS_LED_STATE1,
STATUS_LED_PERIOD1,
0,
},
#endif
#if defined(STATUS_LED_BIT2)
{ STATUS_LED_BIT2,
STATUS_LED_STATE2,
STATUS_LED_PERIOD2,
0,
},
#endif
#if defined(STATUS_LED_BIT3)
{ STATUS_LED_BIT3,
STATUS_LED_STATE3,
STATUS_LED_PERIOD3,
0,
},
#endif
#if defined(STATUS_LED_BIT4)
{ STATUS_LED_BIT4,
STATUS_LED_STATE4,
STATUS_LED_PERIOD4,
0,
},
#endif
#if defined(STATUS_LED_BIT5)
{ STATUS_LED_BIT5,
STATUS_LED_STATE5,
STATUS_LED_PERIOD5,
0,
},
#endif
};
#define MAX_LED_DEV (sizeof(led_dev)/sizeof(led_dev_t))
static int status_led_init_done = 0;
static void status_led_init (void)
{
led_dev_t *ld;
int i;
for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++)
__led_init (ld->mask, ld->state);
status_led_init_done = 1;
}
void status_led_tick (ulong timestamp)
{
led_dev_t *ld;
int i;
if (!status_led_init_done)
status_led_init ();
for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
if (ld->state != STATUS_LED_BLINKING)
continue;
if (++ld->cnt >= ld->period) {
__led_toggle (ld->mask);
ld->cnt -= ld->period;
}
}
}
void status_led_set (int led, int state)
{
led_dev_t *ld;
if (led < 0 || led >= MAX_LED_DEV)
return;
if (!status_led_init_done)
status_led_init ();
ld = &led_dev[led];
ld->state = state;
if (state == STATUS_LED_BLINKING) {
ld->cnt = 0; /* always start with full period */
state = STATUS_LED_ON; /* always start with LED _ON_ */
}
__led_set (ld->mask, state);
}