FreeCalypso > hg > freecalypso-tools

annotate loadtools/gtapower.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents e7502631a0f9
children
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1 /*
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2 * This module is included only when loadtools are being built to run on the
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3 * GTA0x application processor (AP). It provides automated modem power
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4 * control, i.e., coordinates modem power control with loadtools operations
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5 * for convenience.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <sys/file.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13
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14 /*
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15 * Check this pathname: it is correct for the kernel version I'm using
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16 * on my test GTA02, but it differs for some other kernel versions.
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17 */
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18 static char modem_powerctl_pathname[] =
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19 "/sys/bus/platform/devices/gta02-pm-gsm.0/power_on";
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20
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21 void
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22 set_gta_modem_power_ctrl(boolval)
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23 {
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24 char strbuf[16];
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25 int len, fd;
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26
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27 len = sprintf(strbuf, "%d\n", boolval);
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28 fd = open(modem_powerctl_pathname, O_WRONLY);
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29 if (fd < 0) {
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30 perror(modem_powerctl_pathname);
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31 exit(1);
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32 }
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33 write(fd, strbuf, len);
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34 close(fd);
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35 }
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36
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37 void
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38 fork_gta_modem_poweron()
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39 {
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40 int i;
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41
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42 i = fork();
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43 if (i < 0) {
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44 perror("fork");
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45 exit(1);
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46 }
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47 if (i)
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48 return;
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49 printf("Toggling %s\n", modem_powerctl_pathname);
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50 set_gta_modem_power_ctrl(0);
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51 usleep(350000);
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52 set_gta_modem_power_ctrl(1);
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53 exit(0);
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54 }