Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 1 | #include <linux/acpi.h> |
| 2 | #include <acpi/acpi_drivers.h> |
| 3 | #include "tpm.h" |
| 4 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 5 | #define TPM_PPI_REVISION_ID 1 |
| 6 | #define TPM_PPI_FN_VERSION 1 |
| 7 | #define TPM_PPI_FN_SUBREQ 2 |
| 8 | #define TPM_PPI_FN_GETREQ 3 |
| 9 | #define TPM_PPI_FN_GETACT 4 |
| 10 | #define TPM_PPI_FN_GETRSP 5 |
| 11 | #define TPM_PPI_FN_SUBREQ2 7 |
| 12 | #define TPM_PPI_FN_GETOPR 8 |
| 13 | #define PPI_TPM_REQ_MAX 22 |
| 14 | #define PPI_VS_REQ_START 128 |
| 15 | #define PPI_VS_REQ_END 255 |
| 16 | #define PPI_VERSION_LEN 3 |
| 17 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 18 | static const u8 tpm_ppi_uuid[] = { |
| 19 | 0xA6, 0xFA, 0xDD, 0x3D, |
| 20 | 0x1B, 0x36, |
| 21 | 0xB4, 0x4E, |
| 22 | 0xA4, 0x24, |
| 23 | 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53 |
| 24 | }; |
| 25 | |
| 26 | static char *tpm_device_name = "TPM"; |
| 27 | static char tpm_ppi_version[PPI_VERSION_LEN + 1]; |
| 28 | static acpi_handle tpm_ppi_handle; |
| 29 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 30 | static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context, |
| 31 | void **return_value) |
| 32 | { |
Jiang Liu | df45c71 | 2013-12-19 20:38:15 +0800 | [diff] [blame] | 33 | acpi_status status = AE_OK; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 34 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Jiang Liu | df45c71 | 2013-12-19 20:38:15 +0800 | [diff] [blame] | 35 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 36 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
| 37 | if (ACPI_FAILURE(status)) |
| 38 | return AE_OK; |
| 39 | |
| 40 | if (strstr(buffer.pointer, context) != NULL) { |
| 41 | union acpi_object *obj; |
| 42 | |
| 43 | /* Cache version string */ |
| 44 | obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid, |
| 45 | TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION, |
| 46 | NULL, ACPI_TYPE_STRING); |
| 47 | if (obj) { |
| 48 | strlcpy(tpm_ppi_version, obj->string.pointer, |
| 49 | PPI_VERSION_LEN + 1); |
| 50 | ACPI_FREE(obj); |
Jiang Liu | df45c71 | 2013-12-19 20:38:15 +0800 | [diff] [blame] | 51 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 52 | |
| 53 | *return_value = handle; |
| 54 | status = AE_CTRL_TERMINATE; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 55 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 56 | kfree(buffer.pointer); |
Jiang Liu | df45c71 | 2013-12-19 20:38:15 +0800 | [diff] [blame] | 57 | |
| 58 | return status; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 59 | } |
| 60 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 61 | static inline union acpi_object * |
| 62 | tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 63 | { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 64 | BUG_ON(!tpm_ppi_handle); |
| 65 | return acpi_evaluate_dsm_typed(tpm_ppi_handle, tpm_ppi_uuid, |
| 66 | TPM_PPI_REVISION_ID, func, argv4, type); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 67 | } |
| 68 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 69 | static ssize_t tpm_show_ppi_version(struct device *dev, |
| 70 | struct device_attribute *attr, char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 71 | { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 72 | return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_ppi_version); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 73 | } |
| 74 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 75 | static ssize_t tpm_show_ppi_request(struct device *dev, |
| 76 | struct device_attribute *attr, char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 77 | { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 78 | ssize_t size = -EINVAL; |
| 79 | union acpi_object *obj; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 80 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 81 | obj = tpm_eval_dsm(TPM_PPI_FN_GETREQ, ACPI_TYPE_PACKAGE, NULL); |
| 82 | if (!obj) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 83 | return -ENXIO; |
| 84 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 85 | /* |
| 86 | * output.pointer should be of package type, including two integers. |
| 87 | * The first is function return code, 0 means success and 1 means |
| 88 | * error. The second is pending TPM operation requested by the OS, 0 |
| 89 | * means none and >0 means operation value. |
| 90 | */ |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 91 | if (obj->package.count == 2 && |
| 92 | obj->package.elements[0].type == ACPI_TYPE_INTEGER && |
| 93 | obj->package.elements[1].type == ACPI_TYPE_INTEGER) { |
| 94 | if (obj->package.elements[0].integer.value) |
| 95 | size = -EFAULT; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 96 | else |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 97 | size = scnprintf(buf, PAGE_SIZE, "%llu\n", |
| 98 | obj->package.elements[1].integer.value); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 99 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 100 | |
| 101 | ACPI_FREE(obj); |
| 102 | |
| 103 | return size; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 104 | } |
| 105 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 106 | static ssize_t tpm_store_ppi_request(struct device *dev, |
| 107 | struct device_attribute *attr, |
| 108 | const char *buf, size_t count) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 109 | { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 110 | u32 req; |
| 111 | u64 ret; |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 112 | int func = TPM_PPI_FN_SUBREQ; |
| 113 | union acpi_object *obj, tmp; |
| 114 | union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 115 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 116 | /* |
| 117 | * the function to submit TPM operation request to pre-os environment |
| 118 | * is updated with function index from SUBREQ to SUBREQ2 since PPI |
| 119 | * version 1.1 |
| 120 | */ |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 121 | if (strcmp(tpm_ppi_version, "1.1") >= 0) |
| 122 | func = TPM_PPI_FN_SUBREQ2; |
| 123 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 124 | /* |
| 125 | * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS |
| 126 | * accept buffer/string/integer type, but some BIOS accept buffer/ |
| 127 | * string/package type. For PPI version 1.0 and 1.1, use buffer type |
| 128 | * for compatibility, and use package type since 1.2 according to spec. |
| 129 | */ |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 130 | if (strcmp(tpm_ppi_version, "1.2") < 0) { |
| 131 | if (sscanf(buf, "%d", &req) != 1) |
| 132 | return -EINVAL; |
| 133 | argv4.type = ACPI_TYPE_BUFFER; |
| 134 | argv4.buffer.length = sizeof(req); |
| 135 | argv4.buffer.pointer = (u8 *)&req; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 136 | } else { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 137 | tmp.type = ACPI_TYPE_INTEGER; |
| 138 | if (sscanf(buf, "%llu", &tmp.integer.value) != 1) |
| 139 | return -EINVAL; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 140 | } |
| 141 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 142 | obj = tpm_eval_dsm(func, ACPI_TYPE_INTEGER, &argv4); |
| 143 | if (!obj) { |
| 144 | return -ENXIO; |
| 145 | } else { |
| 146 | ret = obj->integer.value; |
| 147 | ACPI_FREE(obj); |
| 148 | } |
| 149 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 150 | if (ret == 0) |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 151 | return (acpi_status)count; |
| 152 | |
| 153 | return (ret == 1) ? -EPERM : -EFAULT; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 154 | } |
| 155 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 156 | static ssize_t tpm_show_ppi_transition_action(struct device *dev, |
| 157 | struct device_attribute *attr, |
| 158 | char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 159 | { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 160 | u32 ret; |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 161 | acpi_status status; |
| 162 | union acpi_object *obj = NULL; |
| 163 | union acpi_object tmp = { |
| 164 | .buffer.type = ACPI_TYPE_BUFFER, |
| 165 | .buffer.length = 0, |
| 166 | .buffer.pointer = NULL |
| 167 | }; |
| 168 | |
| 169 | static char *info[] = { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 170 | "None", |
| 171 | "Shutdown", |
| 172 | "Reboot", |
| 173 | "OS Vendor-specific", |
| 174 | "Error", |
| 175 | }; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 176 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 177 | /* |
| 178 | * PPI spec defines params[3].type as empty package, but some platforms |
| 179 | * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for |
| 180 | * compatibility, define params[3].type as buffer, if PPI version < 1.2 |
| 181 | */ |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 182 | if (strcmp(tpm_ppi_version, "1.2") < 0) |
| 183 | obj = &tmp; |
| 184 | obj = tpm_eval_dsm(TPM_PPI_FN_GETACT, ACPI_TYPE_INTEGER, obj); |
| 185 | if (!obj) { |
| 186 | return -ENXIO; |
| 187 | } else { |
| 188 | ret = obj->integer.value; |
| 189 | ACPI_FREE(obj); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 190 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 191 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 192 | if (ret < ARRAY_SIZE(info) - 1) |
| 193 | status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]); |
| 194 | else |
| 195 | status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, |
| 196 | info[ARRAY_SIZE(info)-1]); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 197 | return status; |
| 198 | } |
| 199 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 200 | static ssize_t tpm_show_ppi_response(struct device *dev, |
| 201 | struct device_attribute *attr, |
| 202 | char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 203 | { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 204 | acpi_status status = -EINVAL; |
| 205 | union acpi_object *obj, *ret_obj; |
| 206 | u64 req, res; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 207 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 208 | obj = tpm_eval_dsm(TPM_PPI_FN_GETRSP, ACPI_TYPE_PACKAGE, NULL); |
| 209 | if (!obj) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 210 | return -ENXIO; |
| 211 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 212 | /* |
| 213 | * parameter output.pointer should be of package type, including |
| 214 | * 3 integers. The first means function return code, the second means |
| 215 | * most recent TPM operation request, and the last means response to |
| 216 | * the most recent TPM operation request. Only if the first is 0, and |
| 217 | * the second integer is not 0, the response makes sense. |
| 218 | */ |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 219 | ret_obj = obj->package.elements; |
| 220 | if (obj->package.count < 3 || |
| 221 | ret_obj[0].type != ACPI_TYPE_INTEGER || |
| 222 | ret_obj[1].type != ACPI_TYPE_INTEGER || |
| 223 | ret_obj[2].type != ACPI_TYPE_INTEGER) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 224 | goto cleanup; |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 225 | |
| 226 | if (ret_obj[0].integer.value) { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 227 | status = -EFAULT; |
| 228 | goto cleanup; |
| 229 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 230 | |
| 231 | req = ret_obj[1].integer.value; |
| 232 | res = ret_obj[2].integer.value; |
| 233 | if (req) { |
| 234 | if (res == 0) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 235 | status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, |
| 236 | "0: Success"); |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 237 | else if (res == 0xFFFFFFF0) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 238 | status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, |
| 239 | "0xFFFFFFF0: User Abort"); |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 240 | else if (res == 0xFFFFFFF1) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 241 | status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, |
| 242 | "0xFFFFFFF1: BIOS Failure"); |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 243 | else if (res >= 1 && res <= 0x00000FFF) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 244 | status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n", |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 245 | req, res, "Corresponding TPM error"); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 246 | else |
| 247 | status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n", |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 248 | req, res, "Error"); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 249 | } else { |
| 250 | status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n", |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 251 | req, "No Recent Request"); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 252 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 253 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 254 | cleanup: |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 255 | ACPI_FREE(obj); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 256 | return status; |
| 257 | } |
| 258 | |
| 259 | static ssize_t show_ppi_operations(char *buf, u32 start, u32 end) |
| 260 | { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 261 | int i; |
| 262 | u32 ret; |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 263 | char *str = buf; |
| 264 | union acpi_object *obj, tmp; |
| 265 | union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp); |
| 266 | |
| 267 | static char *info[] = { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 268 | "Not implemented", |
| 269 | "BIOS only", |
| 270 | "Blocked for OS by BIOS", |
| 271 | "User required", |
| 272 | "User not required", |
| 273 | }; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 274 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 275 | if (strcmp(tpm_ppi_version, "1.2") < 0) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 276 | return -EPERM; |
| 277 | |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 278 | tmp.integer.type = ACPI_TYPE_INTEGER; |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 279 | for (i = start; i <= end; i++) { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 280 | tmp.integer.value = i; |
| 281 | obj = tpm_eval_dsm(TPM_PPI_FN_GETOPR, ACPI_TYPE_INTEGER, &argv); |
| 282 | if (!obj) { |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 283 | return -ENOMEM; |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 284 | } else { |
| 285 | ret = obj->integer.value; |
| 286 | ACPI_FREE(obj); |
| 287 | } |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 288 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 289 | if (ret > 0 && ret < ARRAY_SIZE(info)) |
| 290 | str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n", |
| 291 | i, ret, info[ret]); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 292 | } |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 293 | |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 294 | return str - buf; |
| 295 | } |
| 296 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 297 | static ssize_t tpm_show_ppi_tcg_operations(struct device *dev, |
| 298 | struct device_attribute *attr, |
| 299 | char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 300 | { |
| 301 | return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX); |
| 302 | } |
| 303 | |
Xiaoyan Zhang | 8119807 | 2013-08-29 20:39:11 +0800 | [diff] [blame] | 304 | static ssize_t tpm_show_ppi_vs_operations(struct device *dev, |
| 305 | struct device_attribute *attr, |
| 306 | char *buf) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 307 | { |
| 308 | return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END); |
| 309 | } |
| 310 | |
| 311 | static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL); |
| 312 | static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP, |
| 313 | tpm_show_ppi_request, tpm_store_ppi_request); |
| 314 | static DEVICE_ATTR(transition_action, S_IRUGO, |
| 315 | tpm_show_ppi_transition_action, NULL); |
| 316 | static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL); |
| 317 | static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL); |
| 318 | static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL); |
| 319 | |
| 320 | static struct attribute *ppi_attrs[] = { |
| 321 | &dev_attr_version.attr, |
| 322 | &dev_attr_request.attr, |
| 323 | &dev_attr_transition_action.attr, |
| 324 | &dev_attr_response.attr, |
| 325 | &dev_attr_tcg_operations.attr, |
| 326 | &dev_attr_vs_operations.attr, NULL, |
| 327 | }; |
| 328 | static struct attribute_group ppi_attr_grp = { |
Gang Wei | 1631cfb | 2012-10-09 17:35:22 +0800 | [diff] [blame] | 329 | .name = "ppi", |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 330 | .attrs = ppi_attrs |
| 331 | }; |
| 332 | |
Gang Wei | 1631cfb | 2012-10-09 17:35:22 +0800 | [diff] [blame] | 333 | int tpm_add_ppi(struct kobject *parent) |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 334 | { |
Jiang Liu | 84b1667 | 2013-12-19 20:38:17 +0800 | [diff] [blame^] | 335 | /* Cache TPM ACPI handle and version string */ |
| 336 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, |
| 337 | ppi_callback, NULL, |
| 338 | tpm_device_name, &tpm_ppi_handle); |
| 339 | if (tpm_ppi_handle == NULL) |
| 340 | return -ENODEV; |
| 341 | |
Gang Wei | 1631cfb | 2012-10-09 17:35:22 +0800 | [diff] [blame] | 342 | return sysfs_create_group(parent, &ppi_attr_grp); |
Xiaoyan Zhang | f84fdff | 2012-08-22 18:47:22 +0800 | [diff] [blame] | 343 | } |
Gang Wei | 1631cfb | 2012-10-09 17:35:22 +0800 | [diff] [blame] | 344 | |
| 345 | void tpm_remove_ppi(struct kobject *parent) |
| 346 | { |
| 347 | sysfs_remove_group(parent, &ppi_attr_grp); |
| 348 | } |