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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <errno.h>
#include <string.h>
#include <endian.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "leds.h"
static int leds;
static int reset;
static int verbose = 0;
enum {
off=0, on=1, blink, unknown, transition=unknown
};
void init_leds(void)
{
int i;
if ((leds = open("/dev/leds", O_RDWR)) < 0) {
int e1 = errno;
if (e1 != ENOENT) {
fprintf(stderr,"Error: Could not open LEDS device file '/dev/leds' : %s\n",
strerror(e1));
if(e1 == EACCES)
fprintf(stderr,"Run as root\n");
exit(1);
}
}
if (verbose)
printf("leds: initialized.\n");
}
void led_ioctl( int cmd, int num )
{
int i, st;
if (ioctl(leds, cmd, num) < 0) {
int e1 = errno;
fprintf(stderr, "leds: ioctl(%d,%d): failed to set leds: %s\n",
cmd, num, strerror(e1));
exit(1);
}
}
void led_set( int led, int state )
{
switch (state) {
case off: if (!reset) led_ioctl(N2_LM_OFF, led); break;
case on: led_ioctl(N2_LM_ON, led); break;
case blink: /* Ensure any previous timer gets deleted first and that
* the LED is in a well known state.
*/
if (!reset) led_ioctl(N2_LM_OFF, led);
led_ioctl(N2_LM_BLINK, led); break;
}
}
int led( int ch ) {
switch (ch) {
case 'r': return LED_RS_RED;
case 'g': return LED_RS_GRN;
case '1': return LED_DISK1;
case '2': return LED_DISK2;
case 'A': reset = 1; return LED_ALL;
default: fprintf(stderr, "leds: %c: unknown LED (use r,g,0,1 or A)\n", ch);
exit(1);
}
}
int main( int argc, char **argv )
{
/* Default: switch green on, red off (-A +g). */
if (argc == 1) {
verbose = 1;
init_leds();
led_ioctl(N2_LM_ALL_OFF, 0);
led_ioctl(N2_LM_ON, LED_RS_GRN);
} else {
int i, alt=0, state[PHYS_LEDS];
for(i=0; i<PHYS_LEDS; ++i)
state[i] = unknown;
reset = 0;
while (--argc > 0) {
char *arg = *++argv;
int st;
if (strcmp(arg, "-v") == 0) {
++verbose;
continue;
}
switch (*arg) {
case '+': st = on; break;
case '-': st = off; break;
case '!': st = blink; break;
case '/': st = transition; break;
default: fprintf(stderr, "leds: %c: unknown option\n", *arg);
exit(1);
}
if (st != transition) {
while (*++arg) {
i = led(*arg);
if (i == LED_ALL)
for (i=0; i<PHYS_LEDS; ++i) state[i] = st;
else
state[i] = st;
}
} else {
int done, newstate[PHYS_LEDS];
for(i=0; i<PHYS_LEDS; ++i)
newstate[i] = off;
while (*++arg) {
i = led(*arg);
if (i == LED_ALL)
for (i=0; i<PHYS_LEDS; ++i) newstate[i] = on;
else
newstate[i] = on;
}
/* Merge the newstate back in. This sets 'alt' if going
* from an old state of just red to a new of just green
* or vice versa (and this is the only way of getting
* 'alt')
*/
/* Blink anything which changes from off to on or from
* on to off (this ignores anything already blinking).
*/
for (done=i=0; i<PHYS_LEDS; ++i) {
if (state[i] == !newstate[i]) {
done = 1;
state[i] = blink;
}
}
/* Is anything (new) blinking? If it is then deal
* with the red/green case - blinking red,green is
* amber, is that what we want? This could be
* improved by a better kernel interface - it would
* be nice just to specify on/off times and a start
* time for each LED.
*/
if (done) {
if (state[LED_RS_RED] == blink && state[LED_RS_GRN] == blink &&
newstate[LED_RS_RED] == !newstate[LED_RS_GRN]) {
/* Kernel bug: must switch off r and g first. */
alt = 1;
}
} else {
for (i=0; i<PHYS_LEDS; ++i) {
if (newstate[i] == on) {
state[i] = blink;
}
}
}
}
}
/* Go through the list making the required settings. 'alt' is
* special. 'reset' means A was given and all the settings are
* known.
*/
init_leds();
if (reset)
led_ioctl(N2_LM_ALL_OFF, 0);
if (alt) {
/* Turn the leds off first to get to a known state. */
led_set(LED_RS_GRN, off);
led_set(LED_RS_RED, off);
led_ioctl(N2_LM_ALT, LED_RS_RED);
} else {
/* KERNEL BUG: setting the green timer zaps the red behaviour
* to toggle the green, therefore if red blink is set before
* green blink no blink will happen!
*/
led_set(LED_RS_GRN, state[LED_RS_GRN]);
led_set(LED_RS_RED, state[LED_RS_RED]);
}
led_set(LED_DISK1, state[LED_DISK1]);
led_set(LED_DISK2, state[LED_DISK2]);
}
return 0;
}
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