1 /*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2018, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/device.h>
22 #include <linux/slab.h>
23 #include <linux/uuid.h>
24
25 #include <linux/mei_cl_bus.h>
26
27 #include "mei_dev.h"
28 #include "client.h"
29
30 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
31 0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
32
33 static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
34
35 #define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
36 0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
37
38 #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
39 0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
40
41 #define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
42 0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
43
44 #define MEI_UUID_ANY NULL_UUID_LE
45
46 /**
47 * number_of_connections - determine whether an client be on the bus
48 * according number of connections
49 * We support only clients:
50 * 1. with single connection
51 * 2. and fixed clients (max_number_of_connections == 0)
52 *
53 * @cldev: me clients device
54 */
number_of_connections(struct mei_cl_device * cldev)55 static void number_of_connections(struct mei_cl_device *cldev)
56 {
57 dev_dbg(&cldev->dev, "running hook %s\n", __func__);
58
59 if (cldev->me_cl->props.max_number_of_connections > 1)
60 cldev->do_match = 0;
61 }
62
63 /**
64 * blacklist - blacklist a client from the bus
65 *
66 * @cldev: me clients device
67 */
blacklist(struct mei_cl_device * cldev)68 static void blacklist(struct mei_cl_device *cldev)
69 {
70 dev_dbg(&cldev->dev, "running hook %s\n", __func__);
71
72 cldev->do_match = 0;
73 }
74
75 #define OSTYPE_LINUX 2
76 struct mei_os_ver {
77 __le16 build;
78 __le16 reserved1;
79 u8 os_type;
80 u8 major;
81 u8 minor;
82 u8 reserved2;
83 } __packed;
84
85 #define MKHI_FEATURE_PTT 0x10
86
87 struct mkhi_rule_id {
88 __le16 rule_type;
89 u8 feature_id;
90 u8 reserved;
91 } __packed;
92
93 struct mkhi_fwcaps {
94 struct mkhi_rule_id id;
95 u8 len;
96 u8 data[0];
97 } __packed;
98
99 struct mkhi_fw_ver_block {
100 u16 minor;
101 u8 major;
102 u8 platform;
103 u16 buildno;
104 u16 hotfix;
105 } __packed;
106
107 struct mkhi_fw_ver {
108 struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
109 } __packed;
110
111 #define MKHI_FWCAPS_GROUP_ID 0x3
112 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
113 #define MKHI_GEN_GROUP_ID 0xFF
114 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
115 struct mkhi_msg_hdr {
116 u8 group_id;
117 u8 command;
118 u8 reserved;
119 u8 result;
120 } __packed;
121
122 struct mkhi_msg {
123 struct mkhi_msg_hdr hdr;
124 u8 data[0];
125 } __packed;
126
127 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
128 sizeof(struct mkhi_fwcaps) + \
129 sizeof(struct mei_os_ver))
mei_osver(struct mei_cl_device * cldev)130 static int mei_osver(struct mei_cl_device *cldev)
131 {
132 const size_t size = MKHI_OSVER_BUF_LEN;
133 char buf[MKHI_OSVER_BUF_LEN];
134 struct mkhi_msg *req;
135 struct mkhi_fwcaps *fwcaps;
136 struct mei_os_ver *os_ver;
137 unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
138
139 memset(buf, 0, size);
140
141 req = (struct mkhi_msg *)buf;
142 req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
143 req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
144
145 fwcaps = (struct mkhi_fwcaps *)req->data;
146
147 fwcaps->id.rule_type = 0x0;
148 fwcaps->id.feature_id = MKHI_FEATURE_PTT;
149 fwcaps->len = sizeof(*os_ver);
150 os_ver = (struct mei_os_ver *)fwcaps->data;
151 os_ver->os_type = OSTYPE_LINUX;
152
153 return __mei_cl_send(cldev->cl, buf, size, mode);
154 }
155
156 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
157 sizeof(struct mkhi_fw_ver))
158 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
159 sizeof(struct mkhi_fw_ver_block) * (__num))
160 #define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
mei_fwver(struct mei_cl_device * cldev)161 static int mei_fwver(struct mei_cl_device *cldev)
162 {
163 char buf[MKHI_FWVER_BUF_LEN];
164 struct mkhi_msg *req;
165 struct mkhi_fw_ver *fwver;
166 int bytes_recv, ret, i;
167
168 memset(buf, 0, sizeof(buf));
169
170 req = (struct mkhi_msg *)buf;
171 req->hdr.group_id = MKHI_GEN_GROUP_ID;
172 req->hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
173
174 ret = __mei_cl_send(cldev->cl, buf, sizeof(struct mkhi_msg_hdr),
175 MEI_CL_IO_TX_BLOCKING);
176 if (ret < 0) {
177 dev_err(&cldev->dev, "Could not send ReqFWVersion cmd ret = %d\n", ret);
178 return ret;
179 }
180
181 ret = 0;
182 bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), 0,
183 MKHI_RCV_TIMEOUT);
184 if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
185 /*
186 * Should be at least one version block,
187 * error out if nothing found
188 */
189 dev_err(&cldev->dev, "Could not read FW version ret = %d\n", bytes_recv);
190 return -EIO;
191 }
192
193 fwver = (struct mkhi_fw_ver *)req->data;
194 memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
195 for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
196 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
197 break;
198 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
199 i, fwver->ver[i].platform,
200 fwver->ver[i].major, fwver->ver[i].minor,
201 fwver->ver[i].hotfix, fwver->ver[i].buildno);
202
203 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
204 cldev->bus->fw_ver[i].major = fwver->ver[i].major;
205 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
206 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
207 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
208 }
209
210 return ret;
211 }
212
mei_mkhi_fix(struct mei_cl_device * cldev)213 static void mei_mkhi_fix(struct mei_cl_device *cldev)
214 {
215 int ret;
216
217 /* No need to enable the client if nothing is needed from it */
218 if (!cldev->bus->fw_f_fw_ver_supported &&
219 !cldev->bus->hbm_f_os_supported)
220 return;
221
222 ret = mei_cldev_enable(cldev);
223 if (ret)
224 return;
225
226 if (cldev->bus->fw_f_fw_ver_supported) {
227 ret = mei_fwver(cldev);
228 if (ret < 0)
229 dev_err(&cldev->dev, "FW version command failed %d\n",
230 ret);
231 }
232
233 if (cldev->bus->hbm_f_os_supported) {
234 ret = mei_osver(cldev);
235 if (ret < 0)
236 dev_err(&cldev->dev, "OS version command failed %d\n",
237 ret);
238 }
239 mei_cldev_disable(cldev);
240 }
241
242 /**
243 * mei_wd - wd client on the bus, change protocol version
244 * as the API has changed.
245 *
246 * @cldev: me clients device
247 */
248 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
249 #include <linux/pci.h>
250 #include "hw-me-regs.h"
mei_wd(struct mei_cl_device * cldev)251 static void mei_wd(struct mei_cl_device *cldev)
252 {
253 struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
254
255 dev_dbg(&cldev->dev, "running hook %s\n", __func__);
256 if (pdev->device == MEI_DEV_ID_WPT_LP ||
257 pdev->device == MEI_DEV_ID_SPT ||
258 pdev->device == MEI_DEV_ID_SPT_H)
259 cldev->me_cl->props.protocol_version = 0x2;
260
261 cldev->do_match = 1;
262 }
263 #else
mei_wd(struct mei_cl_device * cldev)264 static inline void mei_wd(struct mei_cl_device *cldev) {}
265 #endif /* CONFIG_INTEL_MEI_ME */
266
267 struct mei_nfc_cmd {
268 u8 command;
269 u8 status;
270 u16 req_id;
271 u32 reserved;
272 u16 data_size;
273 u8 sub_command;
274 u8 data[];
275 } __packed;
276
277 struct mei_nfc_reply {
278 u8 command;
279 u8 status;
280 u16 req_id;
281 u32 reserved;
282 u16 data_size;
283 u8 sub_command;
284 u8 reply_status;
285 u8 data[];
286 } __packed;
287
288 struct mei_nfc_if_version {
289 u8 radio_version_sw[3];
290 u8 reserved[3];
291 u8 radio_version_hw[3];
292 u8 i2c_addr;
293 u8 fw_ivn;
294 u8 vendor_id;
295 u8 radio_type;
296 } __packed;
297
298
299 #define MEI_NFC_CMD_MAINTENANCE 0x00
300 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
301
302 /* Vendors */
303 #define MEI_NFC_VENDOR_INSIDE 0x00
304 #define MEI_NFC_VENDOR_NXP 0x01
305
306 /* Radio types */
307 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
308 #define MEI_NFC_VENDOR_NXP_PN544 0x01
309
310 /**
311 * mei_nfc_if_version - get NFC interface version
312 *
313 * @cl: host client (nfc info)
314 * @ver: NFC interface version to be filled in
315 *
316 * Return: 0 on success; < 0 otherwise
317 */
mei_nfc_if_version(struct mei_cl * cl,struct mei_nfc_if_version * ver)318 static int mei_nfc_if_version(struct mei_cl *cl,
319 struct mei_nfc_if_version *ver)
320 {
321 struct mei_device *bus;
322 struct mei_nfc_cmd cmd = {
323 .command = MEI_NFC_CMD_MAINTENANCE,
324 .data_size = 1,
325 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
326 };
327 struct mei_nfc_reply *reply = NULL;
328 size_t if_version_length;
329 int bytes_recv, ret;
330
331 bus = cl->dev;
332
333 WARN_ON(mutex_is_locked(&bus->device_lock));
334
335 ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd),
336 MEI_CL_IO_TX_BLOCKING);
337 if (ret < 0) {
338 dev_err(bus->dev, "Could not send IF version cmd ret = %d\n", ret);
339 return ret;
340 }
341
342 /* to be sure on the stack we alloc memory */
343 if_version_length = sizeof(struct mei_nfc_reply) +
344 sizeof(struct mei_nfc_if_version);
345
346 reply = kzalloc(if_version_length, GFP_KERNEL);
347 if (!reply)
348 return -ENOMEM;
349
350 ret = 0;
351 bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0, 0);
352 if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
353 dev_err(bus->dev, "Could not read IF version ret = %d\n", bytes_recv);
354 ret = -EIO;
355 goto err;
356 }
357
358 memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version));
359
360 dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
361 ver->fw_ivn, ver->vendor_id, ver->radio_type);
362
363 err:
364 kfree(reply);
365 return ret;
366 }
367
368 /**
369 * mei_nfc_radio_name - derive nfc radio name from the interface version
370 *
371 * @ver: NFC radio version
372 *
373 * Return: radio name string
374 */
mei_nfc_radio_name(struct mei_nfc_if_version * ver)375 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
376 {
377
378 if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
379 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
380 return "microread";
381 }
382
383 if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
384 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
385 return "pn544";
386 }
387
388 return NULL;
389 }
390
391 /**
392 * mei_nfc - The nfc fixup function. The function retrieves nfc radio
393 * name and set is as device attribute so we can load
394 * the proper device driver for it
395 *
396 * @cldev: me client device (nfc)
397 */
mei_nfc(struct mei_cl_device * cldev)398 static void mei_nfc(struct mei_cl_device *cldev)
399 {
400 struct mei_device *bus;
401 struct mei_cl *cl;
402 struct mei_me_client *me_cl = NULL;
403 struct mei_nfc_if_version ver;
404 const char *radio_name = NULL;
405 int ret;
406
407 bus = cldev->bus;
408
409 dev_dbg(&cldev->dev, "running hook %s\n", __func__);
410
411 mutex_lock(&bus->device_lock);
412 /* we need to connect to INFO GUID */
413 cl = mei_cl_alloc_linked(bus);
414 if (IS_ERR(cl)) {
415 ret = PTR_ERR(cl);
416 cl = NULL;
417 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
418 goto out;
419 }
420
421 me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
422 if (!me_cl) {
423 ret = -ENOTTY;
424 dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
425 goto out;
426 }
427
428 ret = mei_cl_connect(cl, me_cl, NULL);
429 if (ret < 0) {
430 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
431 ret);
432 goto out;
433 }
434
435 mutex_unlock(&bus->device_lock);
436
437 ret = mei_nfc_if_version(cl, &ver);
438 if (ret)
439 goto disconnect;
440
441 radio_name = mei_nfc_radio_name(&ver);
442
443 if (!radio_name) {
444 ret = -ENOENT;
445 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
446 ret);
447 goto disconnect;
448 }
449
450 dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
451 strlcpy(cldev->name, radio_name, sizeof(cldev->name));
452
453 disconnect:
454 mutex_lock(&bus->device_lock);
455 if (mei_cl_disconnect(cl) < 0)
456 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
457
458 mei_cl_flush_queues(cl, NULL);
459
460 out:
461 mei_cl_unlink(cl);
462 mutex_unlock(&bus->device_lock);
463 mei_me_cl_put(me_cl);
464 kfree(cl);
465
466 if (ret)
467 cldev->do_match = 0;
468
469 dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
470 }
471
472 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
473
474 static struct mei_fixup {
475
476 const uuid_le uuid;
477 void (*hook)(struct mei_cl_device *cldev);
478 } mei_fixups[] = {
479 MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
480 MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
481 MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
482 MEI_FIXUP(MEI_UUID_WD, mei_wd),
483 MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
484 };
485
486 /**
487 * mei_cldev_fixup - run fixup handlers
488 *
489 * @cldev: me client device
490 */
mei_cl_bus_dev_fixup(struct mei_cl_device * cldev)491 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
492 {
493 struct mei_fixup *f;
494 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
495 size_t i;
496
497 for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
498
499 f = &mei_fixups[i];
500 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
501 uuid_le_cmp(f->uuid, *uuid) == 0)
502 f->hook(cldev);
503 }
504 }
505
506