mirror of git://git.sysmocom.de/ofono
nokia-gpio: do not create links to gpios in /dev/cmt
The nokia-gpio plugin should not try to create symlinks to relevant gpio pins under /dev/cmt, since the location it is looking is no longer correct on newer kernels and it might change again in the future. This patch removes code from nokia-gpio that tries to create a symlink. Users will now need to symlink the modem gpios to /dev/cmt themselves. On the 4.13 kernel, this can be done by, for example, adding a udev rule to: # ln -sf /sys/bus/hsi/devices/n900-modem /dev/cmt
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@ -143,13 +143,6 @@ static int file_exists(char const *filename)
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return stat(filename, &st) == 0;
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}
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static int dir_exists(char const *filename)
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{
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struct stat st;
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return stat(filename, &st) == 0 && S_ISDIR(st.st_mode);
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}
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static int file_write(char const *filename, char const *output)
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{
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FILE *f;
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@ -632,74 +625,15 @@ static void phonet_status_cb(GIsiModem *idx, enum GIsiPhonetLinkState state,
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static int gpio_probe_links(void)
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{
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char const *gpiodir = "/sys/class/gpio";
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char const *cmtdir = "/dev/cmt";
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DIR *gpio;
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struct dirent *d;
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if (file_exists(cmtdir)) {
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DBG("Using %s", cmtdir);
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return 0;
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}
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DBG("Using %s: trying to make links to %s", gpiodir, cmtdir);
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if (!dir_exists(cmtdir)) {
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if (mkdir(cmtdir, 0755) == -1) {
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DBG("%s: %s", cmtdir, strerror(errno));
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return -(errno = ENODEV);
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}
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}
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gpio = opendir(gpiodir);
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if (gpio == NULL) {
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DBG("%s: %s", "gpiodir", strerror(errno));
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if (!file_exists(cmtdir)) {
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DBG("%s: %s", cmtdir, strerror(errno));
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return -(errno = ENODEV);
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}
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while ((d = readdir(gpio)) != NULL) {
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char nn[PATH_MAX], name[PATH_MAX], from[PATH_MAX], to[PATH_MAX];
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FILE *nf;
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size_t len;
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snprintf(nn, sizeof nn, "%s/%s/name", gpiodir, d->d_name);
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nf = fopen(nn, "rb");
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if (nf == NULL) {
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DBG("%s: %s", nn, strerror(errno));
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continue;
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}
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len = fread(name, sizeof name, 1, nf);
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if (ferror(nf)) {
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DBG("read from %s: %s", nn, strerror(errno));
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fclose(nf);
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continue;
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}
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fclose(nf);
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if (len < 4)
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continue;
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name[--len] = '\0';
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if (strncmp(name, "cmt_", 4))
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continue;
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snprintf(from, sizeof from, "%s/%s", gpiodir, d->d_name);
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snprintf(to, sizeof to, "%s/%s", cmtdir, name);
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if (symlink(from, to) == -1)
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DBG("%s: %s", to, strerror(errno));
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}
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DBG("%s: %s", "/sys/class/gpio", strerror(errno));
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(void) closedir(gpio);
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return -(errno = ENODEV);
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DBG("Using %s", cmtdir);
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return 0;
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}
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