summaryrefslogtreecommitdiff
path: root/drivers/misc/mei/nfc.c
blob: 290ef3037437816114e6d373d4889c6ee2855c1b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/slab.h>

#include <linux/mei_cl_bus.h>

#include "mei_dev.h"
#include "client.h"

struct mei_nfc_cmd {
	u8 command;
	u8 status;
	u16 req_id;
	u32 reserved;
	u16 data_size;
	u8 sub_command;
	u8 data[];
} __packed;

struct mei_nfc_reply {
	u8 command;
	u8 status;
	u16 req_id;
	u32 reserved;
	u16 data_size;
	u8 sub_command;
	u8 reply_status;
	u8 data[];
} __packed;

struct mei_nfc_if_version {
	u8 radio_version_sw[3];
	u8 reserved[3];
	u8 radio_version_hw[3];
	u8 i2c_addr;
	u8 fw_ivn;
	u8 vendor_id;
	u8 radio_type;
} __packed;

struct mei_nfc_connect {
	u8 fw_ivn;
	u8 vendor_id;
} __packed;

struct mei_nfc_connect_resp {
	u8 fw_ivn;
	u8 vendor_id;
	u16 me_major;
	u16 me_minor;
	u16 me_hotfix;
	u16 me_build;
} __packed;

struct mei_nfc_hci_hdr {
	u8 cmd;
	u8 status;
	u16 req_id;
	u32 reserved;
	u16 data_size;
} __packed;

#define MEI_NFC_CMD_MAINTENANCE 0x00
#define MEI_NFC_CMD_HCI_SEND 0x01
#define MEI_NFC_CMD_HCI_RECV 0x02

#define MEI_NFC_SUBCMD_CONNECT    0x00
#define MEI_NFC_SUBCMD_IF_VERSION 0x01

#define MEI_NFC_HEADER_SIZE 10

/**
 * struct mei_nfc_dev - NFC mei device
 *
 * @me_cl: NFC me client
 * @cl: NFC host client
 * @cl_info: NFC info host client
 * @init_work: perform connection to the info client
 * @fw_ivn: NFC Interface Version Number
 * @vendor_id: NFC manufacturer ID
 * @radio_type: NFC radio type
 * @bus_name: bus name
 *
 */
struct mei_nfc_dev {
	struct mei_me_client *me_cl;
	struct mei_cl *cl;
	struct mei_cl *cl_info;
	struct work_struct init_work;
	u8 fw_ivn;
	u8 vendor_id;
	u8 radio_type;
	char *bus_name;
};

/* UUIDs for NFC F/W clients */
const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
				     0x94, 0xd4, 0x50, 0x26,
				     0x67, 0x23, 0x77, 0x5c);

static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d,
					0x48, 0xa4, 0xef, 0xab,
					0xba, 0x8a, 0x12, 0x06);

/* Vendors */
#define MEI_NFC_VENDOR_INSIDE 0x00
#define MEI_NFC_VENDOR_NXP    0x01

/* Radio types */
#define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
#define MEI_NFC_VENDOR_NXP_PN544    0x01

static void mei_nfc_free(struct mei_nfc_dev *ndev)
{
	if (!ndev)
		return;

	if (ndev->cl) {
		list_del(&ndev->cl->device_link);
		mei_cl_unlink(ndev->cl);
		kfree(ndev->cl);
	}

	if (ndev->cl_info) {
		list_del(&ndev->cl_info->device_link);
		mei_cl_unlink(ndev->cl_info);
		kfree(ndev->cl_info);
	}

	mei_me_cl_put(ndev->me_cl);
	kfree(ndev);
}

static int mei_nfc_build_bus_name(struct mei_nfc_dev *ndev)
{
	struct mei_device *dev;

	if (!ndev->cl)
		return -ENODEV;

	dev = ndev->cl->dev;

	switch (ndev->vendor_id) {
	case MEI_NFC_VENDOR_INSIDE:
		switch (ndev->radio_type) {
		case MEI_NFC_VENDOR_INSIDE_UREAD:
			ndev->bus_name = "microread";
			return 0;

		default:
			dev_err(dev->dev, "Unknown radio type 0x%x\n",
				ndev->radio_type);

			return -EINVAL;
		}

	case MEI_NFC_VENDOR_NXP:
		switch (ndev->radio_type) {
		case MEI_NFC_VENDOR_NXP_PN544:
			ndev->bus_name = "pn544";
			return 0;
		default:
			dev_err(dev->dev, "Unknown radio type 0x%x\n",
				ndev->radio_type);

			return -EINVAL;
		}

	default:
		dev_err(dev->dev, "Unknown vendor ID 0x%x\n",
			ndev->vendor_id);

		return -EINVAL;
	}

	return 0;
}

static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
{
	struct mei_device *dev;
	struct mei_cl *cl;

	struct mei_nfc_cmd cmd;
	struct mei_nfc_reply *reply = NULL;
	struct mei_nfc_if_version *version;
	size_t if_version_length;
	int bytes_recv, ret;

	cl = ndev->cl_info;
	dev = cl->dev;

	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
	cmd.command = MEI_NFC_CMD_MAINTENANCE;
	cmd.data_size = 1;
	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;

	ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd), 1);
	if (ret < 0) {
		dev_err(dev->dev, "Could not send IF version cmd\n");
		return ret;
	}

	/* to be sure on the stack we alloc memory */
	if_version_length = sizeof(struct mei_nfc_reply) +
		sizeof(struct mei_nfc_if_version);

	reply = kzalloc(if_version_length, GFP_KERNEL);
	if (!reply)
		return -ENOMEM;

	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
	if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
		dev_err(dev->dev, "Could not read IF version\n");
		ret = -EIO;
		goto err;
	}

	version = (struct mei_nfc_if_version *)reply->data;

	ndev->fw_ivn = version->fw_ivn;
	ndev->vendor_id = version->vendor_id;
	ndev->radio_type = version->radio_type;

err:
	kfree(reply);
	return ret;
}

static void mei_nfc_init(struct work_struct *work)
{
	struct mei_device *dev;
	struct mei_cl_device *cldev;
	struct mei_nfc_dev *ndev;
	struct mei_cl *cl_info;
	struct mei_me_client *me_cl_info;

	ndev = container_of(work, struct mei_nfc_dev, init_work);

	cl_info = ndev->cl_info;
	dev = cl_info->dev;

	mutex_lock(&dev->device_lock);

	/* check for valid client id */
	me_cl_info = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
	if (!me_cl_info) {
		mutex_unlock(&dev->device_lock);
		dev_info(dev->dev, "nfc: failed to find the info client\n");
		goto err;
	}

	if (mei_cl_connect(cl_info, me_cl_info, NULL) < 0) {
		mei_me_cl_put(me_cl_info);
		mutex_unlock(&dev->device_lock);
		dev_err(dev->dev, "Could not connect to the NFC INFO ME client");

		goto err;
	}
	mei_me_cl_put(me_cl_info);
	mutex_unlock(&dev->device_lock);

	if (mei_nfc_if_version(ndev) < 0) {
		dev_err(dev->dev, "Could not get the NFC interface version");

		goto err;
	}

	dev_info(dev->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
		ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);

	mutex_lock(&dev->device_lock);

	if (mei_cl_disconnect(cl_info) < 0) {
		mutex_unlock(&dev->device_lock);
		dev_err(dev->dev, "Could not disconnect the NFC INFO ME client");

		goto err;
	}

	mutex_unlock(&dev->device_lock);

	if (mei_nfc_build_bus_name(ndev) < 0) {
		dev_err(dev->dev, "Could not build the bus ID name\n");
		return;
	}

	cldev = mei_cl_add_device(dev, ndev->me_cl, ndev->cl,
				  ndev->bus_name);
	if (!cldev) {
		dev_err(dev->dev, "Could not add the NFC device to the MEI bus\n");

		goto err;
	}

	cldev->priv_data = ndev;


	return;

err:
	mutex_lock(&dev->device_lock);
	mei_nfc_free(ndev);
	mutex_unlock(&dev->device_lock);

}


int mei_nfc_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
{
	struct mei_nfc_dev *ndev;
	struct mei_cl *cl_info, *cl;
	int ret;


	/* in case of internal reset bail out
	 * as the device is already setup
	 */
	cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
	if (cl)
		return 0;

	ndev = kzalloc(sizeof(struct mei_nfc_dev), GFP_KERNEL);
	if (!ndev) {
		ret = -ENOMEM;
		goto err;
	}

	ndev->me_cl = mei_me_cl_get(me_cl);
	if (!ndev->me_cl) {
		ret = -ENODEV;
		goto err;
	}

	cl_info = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
	if (IS_ERR(cl_info)) {
		ret = PTR_ERR(cl_info);
		goto err;
	}

	list_add_tail(&cl_info->device_link, &dev->device_list);

	ndev->cl_info = cl_info;

	cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
	if (IS_ERR(cl)) {
		ret = PTR_ERR(cl);
		goto err;
	}

	list_add_tail(&cl->device_link, &dev->device_list);

	ndev->cl = cl;

	INIT_WORK(&ndev->init_work, mei_nfc_init);
	schedule_work(&ndev->init_work);

	return 0;

err:
	mei_nfc_free(ndev);

	return ret;
}

void mei_nfc_host_exit(struct mei_device *dev)
{
	struct mei_nfc_dev *ndev;
	struct mei_cl *cl;
	struct mei_cl_device *cldev;

	cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
	if (!cl)
		return;

	cldev = cl->device;
	if (!cldev)
		return;

	ndev = (struct mei_nfc_dev *)cldev->priv_data;
	if (ndev)
		cancel_work_sync(&ndev->init_work);

	cldev->priv_data = NULL;

	/* Need to remove the device here
	 * since mei_nfc_free will unlink the clients
	 */
	mei_cl_remove_device(cldev);

	mutex_lock(&dev->device_lock);
	mei_nfc_free(ndev);
	mutex_unlock(&dev->device_lock);
}