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6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/nfc.h>
12
13#include "mei_phy.h"
14
15struct mei_nfc_hdr {
16 u8 cmd;
17 u8 status;
18 u16 req_id;
19 u32 reserved;
20 u16 data_size;
21} __packed;
22
23struct mei_nfc_cmd {
24 struct mei_nfc_hdr hdr;
25 u8 sub_command;
26 u8 data[];
27} __packed;
28
29struct mei_nfc_reply {
30 struct mei_nfc_hdr hdr;
31 u8 sub_command;
32 u8 reply_status;
33 u8 data[];
34} __packed;
35
36struct mei_nfc_if_version {
37 u8 radio_version_sw[3];
38 u8 reserved[3];
39 u8 radio_version_hw[3];
40 u8 i2c_addr;
41 u8 fw_ivn;
42 u8 vendor_id;
43 u8 radio_type;
44} __packed;
45
46struct mei_nfc_connect {
47 u8 fw_ivn;
48 u8 vendor_id;
49} __packed;
50
51struct mei_nfc_connect_resp {
52 u8 fw_ivn;
53 u8 vendor_id;
54 u16 me_major;
55 u16 me_minor;
56 u16 me_hotfix;
57 u16 me_build;
58} __packed;
59
60
61#define MEI_NFC_CMD_MAINTENANCE 0x00
62#define MEI_NFC_CMD_HCI_SEND 0x01
63#define MEI_NFC_CMD_HCI_RECV 0x02
64
65#define MEI_NFC_SUBCMD_CONNECT 0x00
66#define MEI_NFC_SUBCMD_IF_VERSION 0x01
67
68#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
69
70#define MEI_DUMP_SKB_IN(info, skb) \
71do { \
72 pr_debug("%s:\n", info); \
73 print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
74 16, 1, (skb)->data, (skb)->len, false); \
75} while (0)
76
77#define MEI_DUMP_SKB_OUT(info, skb) \
78do { \
79 pr_debug("%s:\n", info); \
80 print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
81 16, 1, (skb)->data, (skb)->len, false); \
82} while (0)
83
84#define MEI_DUMP_NFC_HDR(info, _hdr) \
85do { \
86 pr_debug("%s:\n", info); \
87 pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
88 (_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
89 (_hdr)->reserved, (_hdr)->data_size); \
90} while (0)
91
92static int mei_nfc_if_version(struct nfc_mei_phy *phy)
93{
94
95 struct mei_nfc_cmd cmd;
96 struct mei_nfc_reply *reply = NULL;
97 struct mei_nfc_if_version *version;
98 size_t if_version_length;
99 int bytes_recv, r;
100
101 memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
102 cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
103 cmd.hdr.data_size = 1;
104 cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
105
106 MEI_DUMP_NFC_HDR("version", &cmd.hdr);
107 r = mei_cldev_send(phy->cldev, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
108 if (r < 0) {
109 pr_err("Could not send IF version cmd\n");
110 return r;
111 }
112
113
114 if_version_length = sizeof(struct mei_nfc_reply) +
115 sizeof(struct mei_nfc_if_version);
116
117 reply = kzalloc(if_version_length, GFP_KERNEL);
118 if (!reply)
119 return -ENOMEM;
120
121 bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
122 if (bytes_recv < 0 || bytes_recv < if_version_length) {
123 pr_err("Could not read IF version\n");
124 r = -EIO;
125 goto err;
126 }
127
128 version = (struct mei_nfc_if_version *)reply->data;
129
130 phy->fw_ivn = version->fw_ivn;
131 phy->vendor_id = version->vendor_id;
132 phy->radio_type = version->radio_type;
133
134err:
135 kfree(reply);
136 return r;
137}
138
139static int mei_nfc_connect(struct nfc_mei_phy *phy)
140{
141 struct mei_nfc_cmd *cmd, *reply;
142 struct mei_nfc_connect *connect;
143 struct mei_nfc_connect_resp *connect_resp;
144 size_t connect_length, connect_resp_length;
145 int bytes_recv, r;
146
147 connect_length = sizeof(struct mei_nfc_cmd) +
148 sizeof(struct mei_nfc_connect);
149
150 connect_resp_length = sizeof(struct mei_nfc_cmd) +
151 sizeof(struct mei_nfc_connect_resp);
152
153 cmd = kzalloc(connect_length, GFP_KERNEL);
154 if (!cmd)
155 return -ENOMEM;
156 connect = (struct mei_nfc_connect *)cmd->data;
157
158 reply = kzalloc(connect_resp_length, GFP_KERNEL);
159 if (!reply) {
160 kfree(cmd);
161 return -ENOMEM;
162 }
163
164 connect_resp = (struct mei_nfc_connect_resp *)reply->data;
165
166 cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
167 cmd->hdr.data_size = 3;
168 cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
169 connect->fw_ivn = phy->fw_ivn;
170 connect->vendor_id = phy->vendor_id;
171
172 MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
173 r = mei_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
174 if (r < 0) {
175 pr_err("Could not send connect cmd %d\n", r);
176 goto err;
177 }
178
179 bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply,
180 connect_resp_length);
181 if (bytes_recv < 0) {
182 r = bytes_recv;
183 pr_err("Could not read connect response %d\n", r);
184 goto err;
185 }
186
187 MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);
188
189 pr_info("IVN 0x%x Vendor ID 0x%x\n",
190 connect_resp->fw_ivn, connect_resp->vendor_id);
191
192 pr_info("ME FW %d.%d.%d.%d\n",
193 connect_resp->me_major, connect_resp->me_minor,
194 connect_resp->me_hotfix, connect_resp->me_build);
195
196 r = 0;
197
198err:
199 kfree(reply);
200 kfree(cmd);
201
202 return r;
203}
204
205static int mei_nfc_send(struct nfc_mei_phy *phy, const u8 *buf, size_t length)
206{
207 struct mei_nfc_hdr *hdr;
208 u8 *mei_buf;
209 int err;
210
211 err = -ENOMEM;
212 mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
213 if (!mei_buf)
214 goto out;
215
216 hdr = (struct mei_nfc_hdr *)mei_buf;
217 hdr->cmd = MEI_NFC_CMD_HCI_SEND;
218 hdr->status = 0;
219 hdr->req_id = phy->req_id;
220 hdr->reserved = 0;
221 hdr->data_size = length;
222
223 MEI_DUMP_NFC_HDR("send", hdr);
224
225 memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
226 err = mei_cldev_send(phy->cldev, mei_buf, length + MEI_NFC_HEADER_SIZE);
227 if (err < 0)
228 goto out;
229
230 if (!wait_event_interruptible_timeout(phy->send_wq,
231 phy->recv_req_id == phy->req_id, HZ)) {
232 pr_err("NFC MEI command timeout\n");
233 err = -ETIME;
234 } else {
235 phy->req_id++;
236 }
237out:
238 kfree(mei_buf);
239 return err;
240}
241
242
243
244
245
246
247static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
248{
249 struct nfc_mei_phy *phy = phy_id;
250 int r;
251
252 MEI_DUMP_SKB_OUT("mei frame sent", skb);
253
254 r = mei_nfc_send(phy, skb->data, skb->len);
255 if (r > 0)
256 r = 0;
257
258 return r;
259}
260
261static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length)
262{
263 struct mei_nfc_hdr *hdr;
264 int received_length;
265
266 received_length = mei_cldev_recv(phy->cldev, buf, length);
267 if (received_length < 0)
268 return received_length;
269
270 hdr = (struct mei_nfc_hdr *) buf;
271
272 MEI_DUMP_NFC_HDR("receive", hdr);
273 if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
274 phy->recv_req_id = hdr->req_id;
275 wake_up(&phy->send_wq);
276
277 return 0;
278 }
279
280 return received_length;
281}
282
283
284static void nfc_mei_rx_cb(struct mei_cl_device *cldev)
285{
286 struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
287 struct sk_buff *skb;
288 int reply_size;
289
290 if (!phy)
291 return;
292
293 if (phy->hard_fault != 0)
294 return;
295
296 skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
297 if (!skb)
298 return;
299
300 reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
301 if (reply_size < MEI_NFC_HEADER_SIZE) {
302 kfree_skb(skb);
303 return;
304 }
305
306 skb_put(skb, reply_size);
307 skb_pull(skb, MEI_NFC_HEADER_SIZE);
308
309 MEI_DUMP_SKB_IN("mei frame read", skb);
310
311 nfc_hci_recv_frame(phy->hdev, skb);
312}
313
314static int nfc_mei_phy_enable(void *phy_id)
315{
316 int r;
317 struct nfc_mei_phy *phy = phy_id;
318
319 if (phy->powered == 1)
320 return 0;
321
322 r = mei_cldev_enable(phy->cldev);
323 if (r < 0) {
324 pr_err("Could not enable device %d\n", r);
325 return r;
326 }
327
328 r = mei_nfc_if_version(phy);
329 if (r < 0) {
330 pr_err("Could not enable device %d\n", r);
331 goto err;
332 }
333
334 r = mei_nfc_connect(phy);
335 if (r < 0) {
336 pr_err("Could not connect to device %d\n", r);
337 goto err;
338 }
339
340 r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
341 if (r) {
342 pr_err("Event cb registration failed %d\n", r);
343 goto err;
344 }
345
346 phy->powered = 1;
347
348 return 0;
349
350err:
351 phy->powered = 0;
352 mei_cldev_disable(phy->cldev);
353 return r;
354}
355
356static void nfc_mei_phy_disable(void *phy_id)
357{
358 struct nfc_mei_phy *phy = phy_id;
359
360 mei_cldev_disable(phy->cldev);
361
362 phy->powered = 0;
363}
364
365const struct nfc_phy_ops mei_phy_ops = {
366 .write = nfc_mei_phy_write,
367 .enable = nfc_mei_phy_enable,
368 .disable = nfc_mei_phy_disable,
369};
370EXPORT_SYMBOL_GPL(mei_phy_ops);
371
372struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *cldev)
373{
374 struct nfc_mei_phy *phy;
375
376 phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
377 if (!phy)
378 return NULL;
379
380 phy->cldev = cldev;
381 init_waitqueue_head(&phy->send_wq);
382 mei_cldev_set_drvdata(cldev, phy);
383
384 return phy;
385}
386EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
387
388void nfc_mei_phy_free(struct nfc_mei_phy *phy)
389{
390 mei_cldev_disable(phy->cldev);
391 kfree(phy);
392}
393EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
394
395MODULE_LICENSE("GPL");
396MODULE_DESCRIPTION("mei bus NFC device interface");
397
