diff options
Diffstat (limited to 'src/udev/udev-builtin-firmware.c')
| -rw-r--r-- | src/udev/udev-builtin-firmware.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-firmware.c b/src/udev/udev-builtin-firmware.c new file mode 100644 index 0000000000..2fb75a7335 --- /dev/null +++ b/src/udev/udev-builtin-firmware.c @@ -0,0 +1,172 @@ +/* + * firmware - Kernel firmware loader + * + * Copyright (C) 2009 Piter Punk <piterpunk@slackware.com> + * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details:* + */ + +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <getopt.h> +#include <errno.h> +#include <stdbool.h> +#include <sys/utsname.h> +#include <sys/stat.h> + +#include "udev.h" + +static bool set_loading(struct udev *udev, char *loadpath, const char *state) +{ + FILE *ldfile; + + ldfile = fopen(loadpath, "we"); + if (ldfile == NULL) { + log_error("error: can not open '%s'\n", loadpath); + return false; + }; + fprintf(ldfile, "%s\n", state); + fclose(ldfile); + return true; +} + +static bool copy_firmware(struct udev *udev, const char *source, const char *target, size_t size) +{ + char *buf; + FILE *fsource = NULL, *ftarget = NULL; + bool ret = false; + + buf = malloc(size); + if (buf == NULL) { + log_error("No memory available to load firmware file"); + return false; + } + + log_debug("writing '%s' (%zi) to '%s'\n", source, size, target); + + fsource = fopen(source, "re"); + if (fsource == NULL) + goto exit; + ftarget = fopen(target, "we"); + if (ftarget == NULL) + goto exit; + if (fread(buf, size, 1, fsource) != 1) + goto exit; + if (fwrite(buf, size, 1, ftarget) == 1) + ret = true; +exit: + if (ftarget != NULL) + fclose(ftarget); + if (fsource != NULL) + fclose(fsource); + free(buf); + return ret; +} + +static int builtin_firmware(struct udev_device *dev, int argc, char *argv[], bool test) +{ + struct udev *udev = udev_device_get_udev(dev); + static const char *searchpath[] = { FIRMWARE_PATH }; + char fwencpath[UTIL_PATH_SIZE]; + char misspath[UTIL_PATH_SIZE]; + char loadpath[UTIL_PATH_SIZE]; + char datapath[UTIL_PATH_SIZE]; + char fwpath[UTIL_PATH_SIZE]; + const char *firmware; + FILE *fwfile = NULL; + struct utsname kernel; + struct stat statbuf; + unsigned int i; + int rc = EXIT_SUCCESS; + + firmware = udev_device_get_property_value(dev, "FIRMWARE"); + if (firmware == NULL) { + log_error("firmware parameter missing\n\n"); + rc = EXIT_FAILURE; + goto exit; + } + + /* lookup firmware file */ + uname(&kernel); + for (i = 0; i < ELEMENTSOF(searchpath); i++) { + util_strscpyl(fwpath, sizeof(fwpath), searchpath[i], kernel.release, "/", firmware, NULL); + fwfile = fopen(fwpath, "re"); + if (fwfile != NULL) + break; + + util_strscpyl(fwpath, sizeof(fwpath), searchpath[i], firmware, NULL); + fwfile = fopen(fwpath, "re"); + if (fwfile != NULL) + break; + } + + util_path_encode(firmware, fwencpath, sizeof(fwencpath)); + util_strscpyl(misspath, sizeof(misspath), "/run/udev/firmware-missing/", fwencpath, NULL); + util_strscpyl(loadpath, sizeof(loadpath), udev_device_get_syspath(dev), "/loading", NULL); + + if (fwfile == NULL) { + int err; + + /* This link indicates the missing firmware file and the associated device */ + log_debug("did not find firmware file '%s'\n", firmware); + do { + err = mkdir_parents(misspath, 0755); + if (err != 0 && err != -ENOENT) + break; + err = symlink(udev_device_get_devpath(dev), misspath); + if (err != 0) + err = -errno; + } while (err == -ENOENT); + rc = EXIT_FAILURE; + /* + * Do not cancel the request in the initrd, the real root might have + * the firmware file and the 'coldplug' run in the real root will find + * this pending request and fulfill or cancel it. + * */ + if (!in_initrd()) + set_loading(udev, loadpath, "-1"); + goto exit; + } + + if (stat(fwpath, &statbuf) < 0 || statbuf.st_size == 0) { + rc = EXIT_FAILURE; + goto exit; + } + if (unlink(misspath) == 0) + util_delete_path(udev, misspath); + + if (!set_loading(udev, loadpath, "1")) + goto exit; + + util_strscpyl(datapath, sizeof(datapath), udev_device_get_syspath(dev), "/data", NULL); + if (!copy_firmware(udev, fwpath, datapath, statbuf.st_size)) { + log_error("error sending firmware '%s' to device\n", firmware); + set_loading(udev, loadpath, "-1"); + rc = EXIT_FAILURE; + goto exit; + }; + + set_loading(udev, loadpath, "0"); +exit: + if (fwfile) + fclose(fwfile); + return rc; +} + +const struct udev_builtin udev_builtin_firmware = { + .name = "firmware", + .cmd = builtin_firmware, + .help = "kernel firmware loader", + .run_once = true, +}; |