2 * Texas Instrument's NFC Driver For Shared Transport.
4 * NFC Driver acts as interface between NCI core and
5 * TI Shared Transport Layer.
7 * Copyright (C) 2011 Texas Instruments, Inc.
9 * Written by Ilan Elias <ilane@ti.com>
12 * This file is based on btwilink.c, which was written
13 * by Raja Mani and Pavan Savoy.
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include <linux/platform_device.h>
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/firmware.h>
33 #include <linux/nfc.h>
34 #include <net/nfc/nci.h>
35 #include <net/nfc/nci_core.h>
36 #include <linux/ti_wilink_st.h>
38 #define NFCWILINK_CHNL 12
39 #define NFCWILINK_OPCODE 7
40 #define NFCWILINK_MAX_FRAME_SIZE 300
41 #define NFCWILINK_HDR_LEN 4
42 #define NFCWILINK_OFFSET_LEN_IN_HDR 1
43 #define NFCWILINK_LEN_SIZE 2
44 #define NFCWILINK_REGISTER_TIMEOUT 8000 /* 8 sec */
45 #define NFCWILINK_CMD_TIMEOUT 5000 /* 5 sec */
47 #define BTS_FILE_NAME_MAX_SIZE 40
48 #define BTS_FILE_HDR_MAGIC 0x42535442
49 #define BTS_FILE_CMD_MAX_LEN 0xff
50 #define BTS_FILE_ACTION_TYPE_SEND_CMD 1
52 #define NCI_VS_NFCC_INFO_CMD_GID 0x2f
53 #define NCI_VS_NFCC_INFO_CMD_OID 0x12
54 #define NCI_VS_NFCC_INFO_RSP_GID 0x4f
55 #define NCI_VS_NFCC_INFO_RSP_OID 0x12
57 struct nfcwilink_hdr {
63 struct nci_vs_nfcc_info_cmd {
69 struct nci_vs_nfcc_info_rsp {
87 struct bts_file_action {
94 struct platform_device *pdev;
98 char st_register_cb_status;
99 long (*st_write) (struct sk_buff *);
101 struct completion completed;
103 struct nci_vs_nfcc_info_rsp nfcc_info;
106 /* NFCWILINK driver flags */
109 NFCWILINK_FW_DOWNLOAD,
112 static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb);
114 static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
118 skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
120 skb_reserve(skb, NFCWILINK_HDR_LEN);
125 static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
128 struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;
130 /* Detect NCI_VS_NFCC_INFO_RSP and store the result */
131 if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
132 (rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
133 memcpy(&drv->nfcc_info, rsp,
134 sizeof(struct nci_vs_nfcc_info_rsp));
139 complete(&drv->completed);
142 static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
144 struct nci_vs_nfcc_info_cmd *cmd;
146 unsigned long comp_ret;
149 skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
152 nfc_err(&drv->pdev->dev,
153 "no memory for nci_vs_nfcc_info_cmd\n");
157 cmd = (struct nci_vs_nfcc_info_cmd *)
158 skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
159 cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
160 cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
163 drv->nfcc_info.plen = 0;
165 rc = nfcwilink_send(drv->ndev, skb);
169 comp_ret = wait_for_completion_timeout(&drv->completed,
170 msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
171 dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
174 nfc_err(&drv->pdev->dev,
175 "timeout on wait_for_completion_timeout\n");
179 dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d\n",
180 drv->nfcc_info.plen, drv->nfcc_info.status);
182 if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
183 nfc_err(&drv->pdev->dev, "invalid nci_vs_nfcc_info_rsp\n");
187 snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
188 "TINfcInit_%d.%d.%d.%d.bts",
189 drv->nfcc_info.hw_id,
190 drv->nfcc_info.sw_ver_x,
191 drv->nfcc_info.sw_ver_z,
192 drv->nfcc_info.patch_id);
194 nfc_info(&drv->pdev->dev, "nfcwilink FW file name: %s\n", file_name);
199 static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
201 struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
203 unsigned long comp_ret;
206 /* verify valid cmd for the NFC channel */
207 if ((len <= sizeof(struct nfcwilink_hdr)) ||
208 (len > BTS_FILE_CMD_MAX_LEN) ||
209 (hdr->chnl != NFCWILINK_CHNL) ||
210 (hdr->opcode != NFCWILINK_OPCODE)) {
211 nfc_err(&drv->pdev->dev,
212 "ignoring invalid bts cmd, len %d, chnl %d, opcode %d\n",
213 len, hdr->chnl, hdr->opcode);
217 /* remove the ST header */
218 len -= sizeof(struct nfcwilink_hdr);
219 data += sizeof(struct nfcwilink_hdr);
221 skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
223 nfc_err(&drv->pdev->dev, "no memory for bts cmd\n");
227 memcpy(skb_put(skb, len), data, len);
229 rc = nfcwilink_send(drv->ndev, skb);
233 comp_ret = wait_for_completion_timeout(&drv->completed,
234 msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
235 dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
238 nfc_err(&drv->pdev->dev,
239 "timeout on wait_for_completion_timeout\n");
246 static int nfcwilink_download_fw(struct nfcwilink *drv)
248 unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
249 const struct firmware *fw;
250 __u16 action_type, action_len;
254 set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
256 rc = nfcwilink_get_bts_file_name(drv, file_name);
260 rc = request_firmware(&fw, file_name, &drv->pdev->dev);
262 nfc_err(&drv->pdev->dev, "request_firmware failed %d\n", rc);
264 /* if the file is not found, don't exit with failure */
272 ptr = (__u8 *)fw->data;
274 if ((len == 0) || (ptr == NULL)) {
275 dev_dbg(&drv->pdev->dev,
276 "request_firmware returned size %d\n", len);
280 if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
281 BTS_FILE_HDR_MAGIC) {
282 nfc_err(&drv->pdev->dev, "wrong bts magic number\n");
287 /* remove the BTS header */
288 len -= sizeof(struct bts_file_hdr);
289 ptr += sizeof(struct bts_file_hdr);
293 __le16_to_cpu(((struct bts_file_action *)ptr)->type);
295 __le16_to_cpu(((struct bts_file_action *)ptr)->len);
297 dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d\n",
298 action_type, action_len);
300 switch (action_type) {
301 case BTS_FILE_ACTION_TYPE_SEND_CMD:
302 rc = nfcwilink_send_bts_cmd(drv,
303 ((struct bts_file_action *)ptr)->data,
310 /* advance to the next action */
311 len -= (sizeof(struct bts_file_action) + action_len);
312 ptr += (sizeof(struct bts_file_action) + action_len);
316 release_firmware(fw);
319 clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
323 /* Called by ST when registration is complete */
324 static void nfcwilink_register_complete(void *priv_data, char data)
326 struct nfcwilink *drv = priv_data;
328 /* store ST registration status */
329 drv->st_register_cb_status = data;
331 /* complete the wait in nfc_st_open() */
332 complete(&drv->completed);
335 /* Called by ST when receive data is available */
336 static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
338 struct nfcwilink *drv = priv_data;
349 dev_dbg(&drv->pdev->dev, "receive entry, len %d\n", skb->len);
351 /* strip the ST header
352 (apart for the chnl byte, which is not received in the hdr) */
353 skb_pull(skb, (NFCWILINK_HDR_LEN-1));
355 if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
356 nfcwilink_fw_download_receive(drv, skb);
360 /* Forward skb to NCI core layer */
361 rc = nci_recv_frame(drv->ndev, skb);
363 nfc_err(&drv->pdev->dev, "nci_recv_frame failed %d\n", rc);
370 /* protocol structure registered with ST */
371 static struct st_proto_s nfcwilink_proto = {
372 .chnl_id = NFCWILINK_CHNL,
373 .max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
374 .hdr_len = (NFCWILINK_HDR_LEN-1), /* not including chnl byte */
375 .offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
376 .len_size = NFCWILINK_LEN_SIZE,
378 .recv = nfcwilink_receive,
379 .reg_complete_cb = nfcwilink_register_complete,
383 static int nfcwilink_open(struct nci_dev *ndev)
385 struct nfcwilink *drv = nci_get_drvdata(ndev);
386 unsigned long comp_ret;
389 if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
394 nfcwilink_proto.priv_data = drv;
396 init_completion(&drv->completed);
397 drv->st_register_cb_status = -EINPROGRESS;
399 rc = st_register(&nfcwilink_proto);
401 if (rc == -EINPROGRESS) {
402 comp_ret = wait_for_completion_timeout(
404 msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
406 dev_dbg(&drv->pdev->dev,
407 "wait_for_completion_timeout returned %ld\n",
414 } else if (drv->st_register_cb_status != 0) {
415 rc = drv->st_register_cb_status;
416 nfc_err(&drv->pdev->dev,
417 "st_register_cb failed %d\n", rc);
421 nfc_err(&drv->pdev->dev, "st_register failed %d\n", rc);
426 /* st_register MUST fill the write callback */
427 BUG_ON(nfcwilink_proto.write == NULL);
428 drv->st_write = nfcwilink_proto.write;
430 if (nfcwilink_download_fw(drv)) {
431 nfc_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d\n",
433 /* open should succeed, even if the FW download failed */
439 clear_bit(NFCWILINK_RUNNING, &drv->flags);
445 static int nfcwilink_close(struct nci_dev *ndev)
447 struct nfcwilink *drv = nci_get_drvdata(ndev);
450 if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
453 rc = st_unregister(&nfcwilink_proto);
455 nfc_err(&drv->pdev->dev, "st_unregister failed %d\n", rc);
457 drv->st_write = NULL;
462 static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb)
464 struct nfcwilink *drv = nci_get_drvdata(ndev);
465 struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
468 dev_dbg(&drv->pdev->dev, "send entry, len %d\n", skb->len);
470 if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
475 /* add the ST hdr to the start of the buffer */
476 hdr.len = cpu_to_le16(skb->len);
477 memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
479 /* Insert skb to shared transport layer's transmit queue.
480 * Freeing skb memory is taken care in shared transport layer,
481 * so don't free skb memory here.
483 len = drv->st_write(skb);
486 nfc_err(&drv->pdev->dev, "st_write failed %ld\n", len);
493 static struct nci_ops nfcwilink_ops = {
494 .open = nfcwilink_open,
495 .close = nfcwilink_close,
496 .send = nfcwilink_send,
499 static int nfcwilink_probe(struct platform_device *pdev)
501 static struct nfcwilink *drv;
505 drv = devm_kzalloc(&pdev->dev, sizeof(struct nfcwilink), GFP_KERNEL);
513 protocols = NFC_PROTO_JEWEL_MASK
514 | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
515 | NFC_PROTO_ISO14443_MASK
516 | NFC_PROTO_ISO14443_B_MASK
517 | NFC_PROTO_NFC_DEP_MASK;
519 drv->ndev = nci_allocate_device(&nfcwilink_ops,
524 nfc_err(&pdev->dev, "nci_allocate_device failed\n");
529 nci_set_parent_dev(drv->ndev, &pdev->dev);
530 nci_set_drvdata(drv->ndev, drv);
532 rc = nci_register_device(drv->ndev);
534 nfc_err(&pdev->dev, "nci_register_device failed %d\n", rc);
538 dev_set_drvdata(&pdev->dev, drv);
543 nci_free_device(drv->ndev);
549 static int nfcwilink_remove(struct platform_device *pdev)
551 struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
552 struct nci_dev *ndev;
559 nci_unregister_device(ndev);
560 nci_free_device(ndev);
565 static struct platform_driver nfcwilink_driver = {
566 .probe = nfcwilink_probe,
567 .remove = nfcwilink_remove,
570 .owner = THIS_MODULE,
574 module_platform_driver(nfcwilink_driver);
576 /* ------ Module Info ------ */
578 MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
579 MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
580 MODULE_LICENSE("GPL");