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59fcd7c6 SO |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
4 | * Copyright (c) 2003-2013, 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> | |
36eda94f | 18 | #include <linux/sched.h> |
59fcd7c6 SO |
19 | #include <linux/module.h> |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/device.h> | |
1f180359 | 22 | #include <linux/slab.h> |
71ce7891 | 23 | #include <linux/uuid.h> |
1f180359 | 24 | |
59fcd7c6 SO |
25 | #include <linux/mei_cl_bus.h> |
26 | ||
27 | #include "mei_dev.h" | |
28 | #include "client.h" | |
29 | ||
5b6dca29 TW |
30 | #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \ |
31 | 0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06) | |
32 | ||
6009595a TW |
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 | ||
e97cdb30 TW |
38 | #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \ |
39 | 0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB) | |
40 | ||
71ce7891 TW |
41 | #define MEI_UUID_ANY NULL_UUID_LE |
42 | ||
dd070a16 TW |
43 | /** |
44 | * number_of_connections - determine whether an client be on the bus | |
45 | * according number of connections | |
46 | * We support only clients: | |
47 | * 1. with single connection | |
48 | * 2. and fixed clients (max_number_of_connections == 0) | |
49 | * | |
50 | * @cldev: me clients device | |
51 | */ | |
52 | static void number_of_connections(struct mei_cl_device *cldev) | |
53 | { | |
2bcfdc23 | 54 | dev_dbg(&cldev->dev, "running hook %s\n", __func__); |
dd070a16 TW |
55 | |
56 | if (cldev->me_cl->props.max_number_of_connections > 1) | |
57 | cldev->do_match = 0; | |
58 | } | |
59 | ||
5b6dca29 TW |
60 | /** |
61 | * blacklist - blacklist a client from the bus | |
62 | * | |
63 | * @cldev: me clients device | |
64 | */ | |
65 | static void blacklist(struct mei_cl_device *cldev) | |
66 | { | |
2bcfdc23 TW |
67 | dev_dbg(&cldev->dev, "running hook %s\n", __func__); |
68 | ||
5b6dca29 TW |
69 | cldev->do_match = 0; |
70 | } | |
71 | ||
e97cdb30 TW |
72 | /** |
73 | * mei_wd - wd client on the bus, change protocol version | |
74 | * as the API has changed. | |
75 | * | |
76 | * @cldev: me clients device | |
77 | */ | |
78 | #if IS_ENABLED(CONFIG_INTEL_MEI_ME) | |
79 | #include <linux/pci.h> | |
80 | #include "hw-me-regs.h" | |
81 | static void mei_wd(struct mei_cl_device *cldev) | |
82 | { | |
83 | struct pci_dev *pdev = to_pci_dev(cldev->dev.parent); | |
84 | ||
85 | dev_dbg(&cldev->dev, "running hook %s\n", __func__); | |
86 | if (pdev->device == MEI_DEV_ID_WPT_LP || | |
87 | pdev->device == MEI_DEV_ID_SPT || | |
88 | pdev->device == MEI_DEV_ID_SPT_H) | |
89 | cldev->me_cl->props.protocol_version = 0x2; | |
90 | ||
91 | cldev->do_match = 1; | |
92 | } | |
93 | #else | |
94 | static inline void mei_wd(struct mei_cl_device *cldev) {} | |
95 | #endif /* CONFIG_INTEL_MEI_ME */ | |
96 | ||
59fcd7c6 SO |
97 | struct mei_nfc_cmd { |
98 | u8 command; | |
99 | u8 status; | |
100 | u16 req_id; | |
101 | u32 reserved; | |
102 | u16 data_size; | |
103 | u8 sub_command; | |
104 | u8 data[]; | |
105 | } __packed; | |
106 | ||
107 | struct mei_nfc_reply { | |
108 | u8 command; | |
109 | u8 status; | |
110 | u16 req_id; | |
111 | u32 reserved; | |
112 | u16 data_size; | |
113 | u8 sub_command; | |
114 | u8 reply_status; | |
115 | u8 data[]; | |
116 | } __packed; | |
117 | ||
118 | struct mei_nfc_if_version { | |
119 | u8 radio_version_sw[3]; | |
120 | u8 reserved[3]; | |
121 | u8 radio_version_hw[3]; | |
122 | u8 i2c_addr; | |
123 | u8 fw_ivn; | |
124 | u8 vendor_id; | |
125 | u8 radio_type; | |
126 | } __packed; | |
127 | ||
59fcd7c6 SO |
128 | |
129 | #define MEI_NFC_CMD_MAINTENANCE 0x00 | |
59fcd7c6 SO |
130 | #define MEI_NFC_SUBCMD_IF_VERSION 0x01 |
131 | ||
91a6b95f SO |
132 | /* Vendors */ |
133 | #define MEI_NFC_VENDOR_INSIDE 0x00 | |
134 | #define MEI_NFC_VENDOR_NXP 0x01 | |
135 | ||
136 | /* Radio types */ | |
137 | #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00 | |
138 | #define MEI_NFC_VENDOR_NXP_PN544 0x01 | |
139 | ||
b39910c2 TW |
140 | /** |
141 | * mei_nfc_if_version - get NFC interface version | |
142 | * | |
143 | * @cl: host client (nfc info) | |
144 | * @ver: NFC interface version to be filled in | |
145 | * | |
146 | * Return: 0 on success; < 0 otherwise | |
147 | */ | |
148 | static int mei_nfc_if_version(struct mei_cl *cl, | |
149 | struct mei_nfc_if_version *ver) | |
59fcd7c6 | 150 | { |
b37719c3 | 151 | struct mei_device *bus; |
b39910c2 TW |
152 | struct mei_nfc_cmd cmd = { |
153 | .command = MEI_NFC_CMD_MAINTENANCE, | |
154 | .data_size = 1, | |
155 | .sub_command = MEI_NFC_SUBCMD_IF_VERSION, | |
156 | }; | |
59fcd7c6 | 157 | struct mei_nfc_reply *reply = NULL; |
59fcd7c6 SO |
158 | size_t if_version_length; |
159 | int bytes_recv, ret; | |
160 | ||
b37719c3 | 161 | bus = cl->dev; |
59fcd7c6 | 162 | |
b39910c2 | 163 | WARN_ON(mutex_is_locked(&bus->device_lock)); |
59fcd7c6 | 164 | |
be9b720a | 165 | ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd), 1); |
59fcd7c6 | 166 | if (ret < 0) { |
b37719c3 | 167 | dev_err(bus->dev, "Could not send IF version cmd\n"); |
59fcd7c6 SO |
168 | return ret; |
169 | } | |
170 | ||
171 | /* to be sure on the stack we alloc memory */ | |
172 | if_version_length = sizeof(struct mei_nfc_reply) + | |
173 | sizeof(struct mei_nfc_if_version); | |
174 | ||
175 | reply = kzalloc(if_version_length, GFP_KERNEL); | |
176 | if (!reply) | |
177 | return -ENOMEM; | |
178 | ||
b39910c2 | 179 | ret = 0; |
59fcd7c6 SO |
180 | bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length); |
181 | if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) { | |
b37719c3 | 182 | dev_err(bus->dev, "Could not read IF version\n"); |
59fcd7c6 SO |
183 | ret = -EIO; |
184 | goto err; | |
185 | } | |
186 | ||
b39910c2 | 187 | memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version)); |
59fcd7c6 | 188 | |
b39910c2 TW |
189 | dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n", |
190 | ver->fw_ivn, ver->vendor_id, ver->radio_type); | |
59fcd7c6 SO |
191 | |
192 | err: | |
193 | kfree(reply); | |
194 | return ret; | |
195 | } | |
196 | ||
b39910c2 TW |
197 | /** |
198 | * mei_nfc_radio_name - derive nfc radio name from the interface version | |
199 | * | |
200 | * @ver: NFC radio version | |
201 | * | |
202 | * Return: radio name string | |
203 | */ | |
204 | static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver) | |
205 | { | |
206 | ||
207 | if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) { | |
208 | if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD) | |
209 | return "microread"; | |
210 | } | |
211 | ||
212 | if (ver->vendor_id == MEI_NFC_VENDOR_NXP) { | |
213 | if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544) | |
214 | return "pn544"; | |
215 | } | |
216 | ||
217 | return NULL; | |
218 | } | |
219 | ||
6009595a TW |
220 | /** |
221 | * mei_nfc - The nfc fixup function. The function retrieves nfc radio | |
222 | * name and set is as device attribute so we can load | |
223 | * the proper device driver for it | |
224 | * | |
225 | * @cldev: me client device (nfc) | |
226 | */ | |
227 | static void mei_nfc(struct mei_cl_device *cldev) | |
59fcd7c6 | 228 | { |
b37719c3 | 229 | struct mei_device *bus; |
6009595a TW |
230 | struct mei_cl *cl; |
231 | struct mei_me_client *me_cl = NULL; | |
232 | struct mei_nfc_if_version ver; | |
233 | const char *radio_name = NULL; | |
234 | int ret; | |
59fcd7c6 | 235 | |
6009595a | 236 | bus = cldev->bus; |
59fcd7c6 | 237 | |
2bcfdc23 | 238 | dev_dbg(&cldev->dev, "running hook %s\n", __func__); |
59fcd7c6 | 239 | |
b37719c3 | 240 | mutex_lock(&bus->device_lock); |
6009595a | 241 | /* we need to connect to INFO GUID */ |
7851e008 | 242 | cl = mei_cl_alloc_linked(bus); |
6009595a TW |
243 | if (IS_ERR(cl)) { |
244 | ret = PTR_ERR(cl); | |
245 | cl = NULL; | |
246 | dev_err(bus->dev, "nfc hook alloc failed %d\n", ret); | |
247 | goto out; | |
59fcd7c6 | 248 | } |
59fcd7c6 | 249 | |
6009595a TW |
250 | me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid); |
251 | if (!me_cl) { | |
252 | ret = -ENOTTY; | |
253 | dev_err(bus->dev, "Cannot find nfc info %d\n", ret); | |
254 | goto out; | |
59fcd7c6 SO |
255 | } |
256 | ||
6009595a TW |
257 | ret = mei_cl_connect(cl, me_cl, NULL); |
258 | if (ret < 0) { | |
259 | dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n", | |
260 | ret); | |
261 | goto out; | |
59fcd7c6 SO |
262 | } |
263 | ||
b37719c3 | 264 | mutex_unlock(&bus->device_lock); |
59fcd7c6 | 265 | |
6009595a TW |
266 | ret = mei_nfc_if_version(cl, &ver); |
267 | if (ret) | |
268 | goto disconnect; | |
b39910c2 | 269 | |
6009595a | 270 | radio_name = mei_nfc_radio_name(&ver); |
91a6b95f | 271 | |
6009595a TW |
272 | if (!radio_name) { |
273 | ret = -ENOENT; | |
274 | dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n", | |
275 | ret); | |
276 | goto disconnect; | |
91a6b95f SO |
277 | } |
278 | ||
6009595a TW |
279 | dev_dbg(bus->dev, "nfc radio %s\n", radio_name); |
280 | strlcpy(cldev->name, radio_name, sizeof(cldev->name)); | |
59fcd7c6 | 281 | |
6009595a | 282 | disconnect: |
b37719c3 | 283 | mutex_lock(&bus->device_lock); |
6009595a TW |
284 | if (mei_cl_disconnect(cl) < 0) |
285 | dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n"); | |
59fcd7c6 | 286 | |
6009595a | 287 | mei_cl_flush_queues(cl, NULL); |
59fcd7c6 | 288 | |
6009595a TW |
289 | out: |
290 | mei_cl_unlink(cl); | |
291 | mutex_unlock(&bus->device_lock); | |
292 | mei_me_cl_put(me_cl); | |
293 | kfree(cl); | |
59fcd7c6 | 294 | |
6009595a TW |
295 | if (ret) |
296 | cldev->do_match = 0; | |
4f273959 | 297 | |
6009595a | 298 | dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match); |
48705693 | 299 | } |
dc844b0d | 300 | |
71ce7891 TW |
301 | #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook } |
302 | ||
303 | static struct mei_fixup { | |
304 | ||
305 | const uuid_le uuid; | |
306 | void (*hook)(struct mei_cl_device *cldev); | |
5b6dca29 | 307 | } mei_fixups[] = { |
dd070a16 | 308 | MEI_FIXUP(MEI_UUID_ANY, number_of_connections), |
5b6dca29 | 309 | MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist), |
6009595a | 310 | MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc), |
e97cdb30 | 311 | MEI_FIXUP(MEI_UUID_WD, mei_wd), |
5b6dca29 | 312 | }; |
71ce7891 TW |
313 | |
314 | /** | |
ae48d74d | 315 | * mei_cldev_fixup - run fixup handlers |
71ce7891 TW |
316 | * |
317 | * @cldev: me client device | |
318 | */ | |
ae48d74d | 319 | void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev) |
71ce7891 TW |
320 | { |
321 | struct mei_fixup *f; | |
322 | const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) { | |
326 | ||
327 | f = &mei_fixups[i]; | |
328 | if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 || | |
329 | uuid_le_cmp(f->uuid, *uuid) == 0) | |
330 | f->hook(cldev); | |
331 | } | |
332 | } | |
91a6b95f | 333 |