^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Sample application for SMBIOS communication over WMI interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Performs the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * - Simple cmd_class/cmd_select lookup for TPM information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * - Simple query of known tokens and their values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * - Simple activation of a token
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2017 Dell, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* if uapi header isn't installed, this might not yet exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #ifndef __packed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define __packed __attribute__((packed))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/wmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* It would be better to discover these using udev, but for a simple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * application they're hardcoded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static const char *ioctl_devfs = "/dev/wmi/dell-smbios";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static const char *token_sysfs =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) "/sys/bus/platform/devices/dell-smbios.0/tokens";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static void show_buffer(struct dell_wmi_smbios_buffer *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) printf("Call: %x/%x [%x,%x,%x,%x]\nResults: [%8x,%8x,%8x,%8x]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) buffer->std.cmd_class, buffer->std.cmd_select,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) buffer->std.input[0], buffer->std.input[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) buffer->std.input[2], buffer->std.input[3],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) buffer->std.output[0], buffer->std.output[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) buffer->std.output[2], buffer->std.output[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int run_wmi_smbios_cmd(struct dell_wmi_smbios_buffer *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) fd = open(ioctl_devfs, O_NONBLOCK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ret = ioctl(fd, DELL_WMI_SMBIOS_CMD, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static int find_token(__u16 token, __u16 *location, __u16 *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) char location_sysfs[60];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) char value_sysfs[57];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) char buf[4096];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) FILE *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = sprintf(value_sysfs, "%s/%04x_value", token_sysfs, token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) printf("sprintf value failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) f = fopen(value_sysfs, "rb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (!f) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) printf("failed to open %s\n", value_sysfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) fread(buf, 1, 4096, f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) fclose(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) *value = (__u16) strtol(buf, NULL, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ret = sprintf(location_sysfs, "%s/%04x_location", token_sysfs, token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) printf("sprintf location failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) f = fopen(location_sysfs, "rb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (!f) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) printf("failed to open %s\n", location_sysfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) fread(buf, 1, 4096, f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) fclose(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *location = (__u16) strtol(buf, NULL, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (*location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static int token_is_active(__u16 *location, __u16 *cmpvalue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct dell_wmi_smbios_buffer *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) buffer->std.cmd_class = CLASS_TOKEN_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) buffer->std.cmd_select = SELECT_TOKEN_STD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) buffer->std.input[0] = *location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) ret = run_wmi_smbios_cmd(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (ret != 0 || buffer->std.output[0] != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ret = (buffer->std.output[1] == *cmpvalue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int query_token(__u16 token, struct dell_wmi_smbios_buffer *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) __u16 location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) __u16 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ret = find_token(token, &location, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) printf("unable to find token %04x\n", token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return token_is_active(&location, &value, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int activate_token(struct dell_wmi_smbios_buffer *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) __u16 token)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) __u16 location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) __u16 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ret = find_token(token, &location, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) printf("unable to find token %04x\n", token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) buffer->std.cmd_class = CLASS_TOKEN_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) buffer->std.cmd_select = SELECT_TOKEN_STD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) buffer->std.input[0] = location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) buffer->std.input[1] = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = run_wmi_smbios_cmd(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static int query_buffer_size(__u64 *buffer_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) FILE *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) f = fopen(ioctl_devfs, "rb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (!f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) fread(buffer_size, sizeof(__u64), 1, f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) fclose(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return EXIT_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct dell_wmi_smbios_buffer *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) __u64 value = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret = query_buffer_size(&value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (ret == EXIT_FAILURE || !value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) printf("Unable to read buffer size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) printf("Detected required buffer size %lld\n", value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) buffer = malloc(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (buffer == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) printf("failed to alloc memory for ioctl\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) buffer->length = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* simple SMBIOS call for looking up TPM info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) buffer->std.cmd_class = CLASS_FLASH_INTERFACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) buffer->std.cmd_select = SELECT_FLASH_INTERFACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) buffer->std.input[0] = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ret = run_wmi_smbios_cmd(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) printf("smbios ioctl failed: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ret = EXIT_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) show_buffer(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* query some tokens */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) ret = query_token(CAPSULE_EN_TOKEN, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) printf("UEFI Capsule enabled token is: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) ret = query_token(CAPSULE_DIS_TOKEN, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) printf("UEFI Capsule disabled token is: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* activate UEFI capsule token if disabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) printf("Enabling UEFI capsule token");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (activate_token(buffer, CAPSULE_EN_TOKEN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) printf("activate failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) ret = EXIT_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) free(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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