1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2013-2020, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/module.h>
10 #include <linux/device.h>
11 #include <linux/slab.h>
12 #include <linux/uuid.h>
14 #include <linux/mei_cl_bus.h>
19 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
20 0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
22 static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
24 #define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
25 0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
27 #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
28 0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
30 #define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
31 0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
33 #define MEI_UUID_IGSC_MKHI UUID_LE(0xE2C2AFA2, 0x3817, 0x4D19, \
34 0x9D, 0x95, 0x06, 0xB1, 0x6B, 0x58, 0x8A, 0x5D)
36 #define MEI_UUID_IGSC_MKHI_FIX UUID_LE(0x46E0C1FB, 0xA546, 0x414F, \
37 0x91, 0x70, 0xB7, 0xF4, 0x6D, 0x57, 0xB4, 0xAD)
39 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, \
40 0xA5, 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
42 #define MEI_UUID_PAVP UUID_LE(0xfbf6fcf1, 0x96cf, 0x4e2e, 0xA6, \
43 0xa6, 0x1b, 0xab, 0x8c, 0xbe, 0x36, 0xb1)
45 #define MEI_UUID_ANY NULL_UUID_LE
48 * number_of_connections - determine whether an client be on the bus
49 * according number of connections
50 * We support only clients:
51 * 1. with single connection
52 * 2. and fixed clients (max_number_of_connections == 0)
54 * @cldev: me clients device
56 static void number_of_connections(struct mei_cl_device *cldev)
58 if (cldev->me_cl->props.max_number_of_connections > 1)
63 * blacklist - blacklist a client from the bus
65 * @cldev: me clients device
67 static void blacklist(struct mei_cl_device *cldev)
73 * whitelist - forcefully whitelist client
75 * @cldev: me clients device
77 static void whitelist(struct mei_cl_device *cldev)
82 #define OSTYPE_LINUX 2
92 #define MKHI_FEATURE_PTT 0x10
101 struct mkhi_rule_id id;
106 struct mkhi_fw_ver_block {
115 struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
118 #define MKHI_FWCAPS_GROUP_ID 0x3
119 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
120 #define MKHI_GEN_GROUP_ID 0xFF
121 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
122 struct mkhi_msg_hdr {
130 struct mkhi_msg_hdr hdr;
134 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
135 sizeof(struct mkhi_fwcaps) + \
136 sizeof(struct mei_os_ver))
137 static int mei_osver(struct mei_cl_device *cldev)
139 const size_t size = MKHI_OSVER_BUF_LEN;
140 char buf[MKHI_OSVER_BUF_LEN];
141 struct mkhi_msg *req;
142 struct mkhi_fwcaps *fwcaps;
143 struct mei_os_ver *os_ver;
144 unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
146 memset(buf, 0, size);
148 req = (struct mkhi_msg *)buf;
149 req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
150 req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
152 fwcaps = (struct mkhi_fwcaps *)req->data;
154 fwcaps->id.rule_type = 0x0;
155 fwcaps->id.feature_id = MKHI_FEATURE_PTT;
156 fwcaps->len = sizeof(*os_ver);
157 os_ver = (struct mei_os_ver *)fwcaps->data;
158 os_ver->os_type = OSTYPE_LINUX;
160 return __mei_cl_send(cldev->cl, buf, size, 0, mode);
163 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
164 sizeof(struct mkhi_fw_ver))
165 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
166 sizeof(struct mkhi_fw_ver_block) * (__num))
167 #define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
168 static int mei_fwver(struct mei_cl_device *cldev)
170 char buf[MKHI_FWVER_BUF_LEN];
172 struct mkhi_msg *rsp;
173 struct mkhi_fw_ver *fwver;
174 int bytes_recv, ret, i;
176 memset(buf, 0, sizeof(buf));
178 req.hdr.group_id = MKHI_GEN_GROUP_ID;
179 req.hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
181 ret = __mei_cl_send(cldev->cl, (u8 *)&req, sizeof(req), 0,
182 MEI_CL_IO_TX_BLOCKING);
184 dev_err(&cldev->dev, "Could not send ReqFWVersion cmd\n");
189 bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), NULL, 0,
191 if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
193 * Should be at least one version block,
194 * error out if nothing found
196 dev_err(&cldev->dev, "Could not read FW version\n");
200 rsp = (struct mkhi_msg *)buf;
201 fwver = (struct mkhi_fw_ver *)rsp->data;
202 memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
203 for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
204 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
206 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
207 i, fwver->ver[i].platform,
208 fwver->ver[i].major, fwver->ver[i].minor,
209 fwver->ver[i].hotfix, fwver->ver[i].buildno);
211 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
212 cldev->bus->fw_ver[i].major = fwver->ver[i].major;
213 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
214 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
215 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
221 static void mei_mkhi_fix(struct mei_cl_device *cldev)
225 /* No need to enable the client if nothing is needed from it */
226 if (!cldev->bus->fw_f_fw_ver_supported &&
227 !cldev->bus->hbm_f_os_supported)
230 ret = mei_cldev_enable(cldev);
234 if (cldev->bus->fw_f_fw_ver_supported) {
235 ret = mei_fwver(cldev);
237 dev_err(&cldev->dev, "FW version command failed %d\n",
241 if (cldev->bus->hbm_f_os_supported) {
242 ret = mei_osver(cldev);
244 dev_err(&cldev->dev, "OS version command failed %d\n",
247 mei_cldev_disable(cldev);
250 static void mei_gsc_mkhi_ver(struct mei_cl_device *cldev)
254 /* No need to enable the client if nothing is needed from it */
255 if (!cldev->bus->fw_f_fw_ver_supported)
258 ret = mei_cldev_enable(cldev);
262 ret = mei_fwver(cldev);
264 dev_err(&cldev->dev, "FW version command failed %d\n", ret);
265 mei_cldev_disable(cldev);
268 * mei_wd - wd client on the bus, change protocol version
269 * as the API has changed.
271 * @cldev: me clients device
273 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
274 #include <linux/pci.h>
275 #include "hw-me-regs.h"
276 static void mei_wd(struct mei_cl_device *cldev)
278 struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
280 if (pdev->device == MEI_DEV_ID_WPT_LP ||
281 pdev->device == MEI_DEV_ID_SPT ||
282 pdev->device == MEI_DEV_ID_SPT_H)
283 cldev->me_cl->props.protocol_version = 0x2;
288 static inline void mei_wd(struct mei_cl_device *cldev) {}
289 #endif /* CONFIG_INTEL_MEI_ME */
301 struct mei_nfc_reply {
312 struct mei_nfc_if_version {
313 u8 radio_version_sw[3];
315 u8 radio_version_hw[3];
323 #define MEI_NFC_CMD_MAINTENANCE 0x00
324 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
327 #define MEI_NFC_VENDOR_INSIDE 0x00
328 #define MEI_NFC_VENDOR_NXP 0x01
331 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
332 #define MEI_NFC_VENDOR_NXP_PN544 0x01
335 * mei_nfc_if_version - get NFC interface version
337 * @cl: host client (nfc info)
338 * @ver: NFC interface version to be filled in
340 * Return: 0 on success; < 0 otherwise
342 static int mei_nfc_if_version(struct mei_cl *cl,
343 struct mei_nfc_if_version *ver)
345 struct mei_device *bus;
346 struct mei_nfc_cmd cmd = {
347 .command = MEI_NFC_CMD_MAINTENANCE,
349 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
351 struct mei_nfc_reply *reply = NULL;
352 size_t if_version_length;
358 WARN_ON(mutex_is_locked(&bus->device_lock));
360 ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(cmd), 0,
361 MEI_CL_IO_TX_BLOCKING);
363 dev_err(bus->dev, "Could not send IF version cmd\n");
367 /* to be sure on the stack we alloc memory */
368 if_version_length = sizeof(*reply) + sizeof(*ver);
370 reply = kzalloc(if_version_length, GFP_KERNEL);
375 bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, &vtag,
377 if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
378 dev_err(bus->dev, "Could not read IF version\n");
383 memcpy(ver, reply->data, sizeof(*ver));
385 dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
386 ver->fw_ivn, ver->vendor_id, ver->radio_type);
394 * mei_nfc_radio_name - derive nfc radio name from the interface version
396 * @ver: NFC radio version
398 * Return: radio name string
400 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
403 if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
404 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
408 if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
409 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
417 * mei_nfc - The nfc fixup function. The function retrieves nfc radio
418 * name and set is as device attribute so we can load
419 * the proper device driver for it
421 * @cldev: me client device (nfc)
423 static void mei_nfc(struct mei_cl_device *cldev)
425 struct mei_device *bus;
427 struct mei_me_client *me_cl = NULL;
428 struct mei_nfc_if_version ver;
429 const char *radio_name = NULL;
434 mutex_lock(&bus->device_lock);
435 /* we need to connect to INFO GUID */
436 cl = mei_cl_alloc_linked(bus);
440 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
444 me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
447 dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
451 ret = mei_cl_connect(cl, me_cl, NULL);
453 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
458 mutex_unlock(&bus->device_lock);
460 ret = mei_nfc_if_version(cl, &ver);
464 radio_name = mei_nfc_radio_name(&ver);
468 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
473 dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
474 strlcpy(cldev->name, radio_name, sizeof(cldev->name));
477 mutex_lock(&bus->device_lock);
478 if (mei_cl_disconnect(cl) < 0)
479 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
481 mei_cl_flush_queues(cl, NULL);
485 mutex_unlock(&bus->device_lock);
486 mei_me_cl_put(me_cl);
492 dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
496 * vt_support - enable on bus clients with vtag support
498 * @cldev: me clients device
500 static void vt_support(struct mei_cl_device *cldev)
502 if (cldev->me_cl->props.vt_supported == 1)
506 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
508 static struct mei_fixup {
511 void (*hook)(struct mei_cl_device *cldev);
513 MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
514 MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
515 MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
516 MEI_FIXUP(MEI_UUID_WD, mei_wd),
517 MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
518 MEI_FIXUP(MEI_UUID_IGSC_MKHI, mei_gsc_mkhi_ver),
519 MEI_FIXUP(MEI_UUID_IGSC_MKHI_FIX, mei_gsc_mkhi_ver),
520 MEI_FIXUP(MEI_UUID_HDCP, whitelist),
521 MEI_FIXUP(MEI_UUID_ANY, vt_support),
522 MEI_FIXUP(MEI_UUID_PAVP, whitelist),
526 * mei_cl_bus_dev_fixup - run fixup handlers
528 * @cldev: me client device
530 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
533 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
536 for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
539 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
540 uuid_le_cmp(f->uuid, *uuid) == 0)