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93aead46 IE |
1 | /* |
2 | * Texas Instrument's NFC Driver For Shared Transport. | |
3 | * | |
4 | * NFC Driver acts as interface between NCI core and | |
5 | * TI Shared Transport Layer. | |
6 | * | |
7 | * Copyright (C) 2011 Texas Instruments, Inc. | |
8 | * | |
9 | * Written by Ilan Elias <ilane@ti.com> | |
10 | * | |
11 | * Acknowledgements: | |
12 | * This file is based on btwilink.c, which was written | |
13 | * by Raja Mani and Pavan Savoy. | |
14 | * | |
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. | |
18 | * | |
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. | |
23 | * | |
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 | |
27 | * | |
28 | */ | |
29 | #include <linux/platform_device.h> | |
30 | #include <linux/nfc.h> | |
31 | #include <net/nfc/nci.h> | |
32 | #include <net/nfc/nci_core.h> | |
33 | #include <linux/ti_wilink_st.h> | |
34 | ||
35 | #define NFCWILINK_CHNL 12 | |
36 | #define NFCWILINK_OPCODE 7 | |
37 | #define NFCWILINK_MAX_FRAME_SIZE 300 | |
38 | #define NFCWILINK_HDR_LEN 4 | |
39 | #define NFCWILINK_OFFSET_LEN_IN_HDR 1 | |
40 | #define NFCWILINK_LEN_SIZE 2 | |
41 | #define NFCWILINK_REGISTER_TIMEOUT 8000 /* 8 sec */ | |
42 | ||
43 | struct nfcwilink_hdr { | |
44 | u8 chnl; | |
45 | u8 opcode; | |
46 | u16 len; | |
47 | } __packed; | |
48 | ||
49 | struct nfcwilink { | |
50 | struct platform_device *pdev; | |
51 | struct nci_dev *ndev; | |
52 | unsigned long flags; | |
53 | ||
54 | char st_register_cb_status; | |
55 | long (*st_write) (struct sk_buff *); | |
56 | struct completion st_register_completed; | |
57 | }; | |
58 | ||
59 | /* NFCWILINK driver flags */ | |
60 | enum { | |
61 | NFCWILINK_RUNNING, | |
62 | }; | |
63 | ||
64 | /* Called by ST when registration is complete */ | |
65 | static void nfcwilink_register_complete(void *priv_data, char data) | |
66 | { | |
67 | struct nfcwilink *drv = priv_data; | |
68 | ||
69 | nfc_dev_dbg(&drv->pdev->dev, "register_complete entry"); | |
70 | ||
71 | /* store ST registration status */ | |
72 | drv->st_register_cb_status = data; | |
73 | ||
74 | /* complete the wait in nfc_st_open() */ | |
75 | complete(&drv->st_register_completed); | |
76 | } | |
77 | ||
78 | /* Called by ST when receive data is available */ | |
79 | static long nfcwilink_receive(void *priv_data, struct sk_buff *skb) | |
80 | { | |
81 | struct nfcwilink *drv = priv_data; | |
82 | int rc; | |
83 | ||
84 | nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len); | |
85 | ||
86 | if (!skb) | |
87 | return -EFAULT; | |
88 | ||
89 | if (!drv) { | |
90 | kfree_skb(skb); | |
91 | return -EFAULT; | |
92 | } | |
93 | ||
94 | /* strip the ST header | |
95 | (apart for the chnl byte, which is not received in the hdr) */ | |
96 | skb_pull(skb, (NFCWILINK_HDR_LEN-1)); | |
97 | ||
98 | skb->dev = (void *) drv->ndev; | |
99 | ||
100 | /* Forward skb to NCI core layer */ | |
101 | rc = nci_recv_frame(skb); | |
102 | if (rc < 0) { | |
103 | nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc); | |
104 | return rc; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | /* protocol structure registered with ST */ | |
111 | static struct st_proto_s nfcwilink_proto = { | |
112 | .chnl_id = NFCWILINK_CHNL, | |
113 | .max_frame_size = NFCWILINK_MAX_FRAME_SIZE, | |
114 | .hdr_len = (NFCWILINK_HDR_LEN-1), /* not including chnl byte */ | |
115 | .offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR, | |
116 | .len_size = NFCWILINK_LEN_SIZE, | |
117 | .reserve = 0, | |
118 | .recv = nfcwilink_receive, | |
119 | .reg_complete_cb = nfcwilink_register_complete, | |
120 | .write = NULL, | |
121 | }; | |
122 | ||
123 | static int nfcwilink_open(struct nci_dev *ndev) | |
124 | { | |
125 | struct nfcwilink *drv = nci_get_drvdata(ndev); | |
126 | unsigned long comp_ret; | |
127 | int rc; | |
128 | ||
129 | nfc_dev_dbg(&drv->pdev->dev, "open entry"); | |
130 | ||
131 | if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) { | |
132 | rc = -EBUSY; | |
133 | goto exit; | |
134 | } | |
135 | ||
136 | nfcwilink_proto.priv_data = drv; | |
137 | ||
138 | init_completion(&drv->st_register_completed); | |
139 | drv->st_register_cb_status = -EINPROGRESS; | |
140 | ||
141 | rc = st_register(&nfcwilink_proto); | |
142 | if (rc < 0) { | |
143 | if (rc == -EINPROGRESS) { | |
144 | comp_ret = wait_for_completion_timeout( | |
145 | &drv->st_register_completed, | |
146 | msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT)); | |
147 | ||
148 | nfc_dev_dbg(&drv->pdev->dev, | |
149 | "wait_for_completion_timeout returned %ld", | |
150 | comp_ret); | |
151 | ||
152 | if (comp_ret == 0) { | |
153 | /* timeout */ | |
154 | rc = -ETIMEDOUT; | |
155 | goto clear_exit; | |
156 | } else if (drv->st_register_cb_status != 0) { | |
157 | rc = drv->st_register_cb_status; | |
158 | nfc_dev_err(&drv->pdev->dev, | |
159 | "st_register_cb failed %d", rc); | |
160 | goto clear_exit; | |
161 | } | |
162 | } else { | |
163 | nfc_dev_err(&drv->pdev->dev, | |
164 | "st_register failed %d", rc); | |
165 | goto clear_exit; | |
166 | } | |
167 | } | |
168 | ||
169 | /* st_register MUST fill the write callback */ | |
170 | BUG_ON(nfcwilink_proto.write == NULL); | |
171 | drv->st_write = nfcwilink_proto.write; | |
172 | ||
173 | goto exit; | |
174 | ||
175 | clear_exit: | |
176 | clear_bit(NFCWILINK_RUNNING, &drv->flags); | |
177 | ||
178 | exit: | |
179 | return rc; | |
180 | } | |
181 | ||
182 | static int nfcwilink_close(struct nci_dev *ndev) | |
183 | { | |
184 | struct nfcwilink *drv = nci_get_drvdata(ndev); | |
185 | int rc; | |
186 | ||
187 | nfc_dev_dbg(&drv->pdev->dev, "close entry"); | |
188 | ||
189 | if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags)) | |
190 | return 0; | |
191 | ||
192 | rc = st_unregister(&nfcwilink_proto); | |
193 | if (rc) | |
194 | nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc); | |
195 | ||
196 | drv->st_write = NULL; | |
197 | ||
198 | return rc; | |
199 | } | |
200 | ||
201 | static int nfcwilink_send(struct sk_buff *skb) | |
202 | { | |
203 | struct nci_dev *ndev = (struct nci_dev *)skb->dev; | |
204 | struct nfcwilink *drv = nci_get_drvdata(ndev); | |
205 | struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000}; | |
206 | long len; | |
207 | ||
208 | nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len); | |
209 | ||
210 | if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) | |
211 | return -EBUSY; | |
212 | ||
213 | /* add the ST hdr to the start of the buffer */ | |
214 | hdr.len = skb->len; | |
215 | memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN); | |
216 | ||
217 | /* Insert skb to shared transport layer's transmit queue. | |
218 | * Freeing skb memory is taken care in shared transport layer, | |
219 | * so don't free skb memory here. | |
220 | */ | |
221 | len = drv->st_write(skb); | |
222 | if (len < 0) { | |
223 | kfree_skb(skb); | |
224 | nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len); | |
225 | return -EFAULT; | |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct nci_ops nfcwilink_ops = { | |
232 | .open = nfcwilink_open, | |
233 | .close = nfcwilink_close, | |
234 | .send = nfcwilink_send, | |
235 | }; | |
236 | ||
237 | static int nfcwilink_probe(struct platform_device *pdev) | |
238 | { | |
239 | static struct nfcwilink *drv; | |
240 | int rc; | |
241 | u32 protocols; | |
242 | ||
243 | nfc_dev_dbg(&pdev->dev, "probe entry"); | |
244 | ||
245 | drv = kzalloc(sizeof(struct nfcwilink), GFP_KERNEL); | |
246 | if (!drv) { | |
247 | rc = -ENOMEM; | |
248 | goto exit; | |
249 | } | |
250 | ||
251 | drv->pdev = pdev; | |
252 | ||
253 | protocols = NFC_PROTO_JEWEL_MASK | |
254 | | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK | |
255 | | NFC_PROTO_ISO14443_MASK | |
256 | | NFC_PROTO_NFC_DEP_MASK; | |
257 | ||
258 | drv->ndev = nci_allocate_device(&nfcwilink_ops, | |
259 | protocols, | |
260 | NFCWILINK_HDR_LEN, | |
261 | 0); | |
262 | if (!drv->ndev) { | |
263 | nfc_dev_err(&pdev->dev, "nci_allocate_device failed"); | |
264 | rc = -ENOMEM; | |
265 | goto free_exit; | |
266 | } | |
267 | ||
268 | nci_set_parent_dev(drv->ndev, &pdev->dev); | |
269 | nci_set_drvdata(drv->ndev, drv); | |
270 | ||
271 | rc = nci_register_device(drv->ndev); | |
272 | if (rc < 0) { | |
273 | nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc); | |
274 | goto free_dev_exit; | |
275 | } | |
276 | ||
277 | dev_set_drvdata(&pdev->dev, drv); | |
278 | ||
279 | goto exit; | |
280 | ||
281 | free_dev_exit: | |
282 | nci_free_device(drv->ndev); | |
283 | ||
284 | free_exit: | |
285 | kfree(drv); | |
286 | ||
287 | exit: | |
288 | return rc; | |
289 | } | |
290 | ||
291 | static int nfcwilink_remove(struct platform_device *pdev) | |
292 | { | |
293 | struct nfcwilink *drv = dev_get_drvdata(&pdev->dev); | |
294 | struct nci_dev *ndev; | |
295 | ||
296 | nfc_dev_dbg(&pdev->dev, "remove entry"); | |
297 | ||
298 | if (!drv) | |
299 | return -EFAULT; | |
300 | ||
301 | ndev = drv->ndev; | |
302 | ||
303 | nci_unregister_device(ndev); | |
304 | nci_free_device(ndev); | |
305 | ||
306 | kfree(drv); | |
307 | ||
308 | dev_set_drvdata(&pdev->dev, NULL); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static struct platform_driver nfcwilink_driver = { | |
314 | .probe = nfcwilink_probe, | |
315 | .remove = nfcwilink_remove, | |
316 | .driver = { | |
317 | .name = "nfcwilink", | |
318 | .owner = THIS_MODULE, | |
319 | }, | |
320 | }; | |
321 | ||
322 | /* ------- Module Init/Exit interfaces ------ */ | |
323 | static int __init nfcwilink_init(void) | |
324 | { | |
325 | printk(KERN_INFO "NFC Driver for TI WiLink"); | |
326 | ||
327 | return platform_driver_register(&nfcwilink_driver); | |
328 | } | |
329 | ||
330 | static void __exit nfcwilink_exit(void) | |
331 | { | |
332 | platform_driver_unregister(&nfcwilink_driver); | |
333 | } | |
334 | ||
335 | module_init(nfcwilink_init); | |
336 | module_exit(nfcwilink_exit); | |
337 | ||
338 | /* ------ Module Info ------ */ | |
339 | ||
340 | MODULE_AUTHOR("Ilan Elias <ilane@ti.com>"); | |
341 | MODULE_DESCRIPTION("NFC Driver for TI Shared Transport"); | |
342 | MODULE_LICENSE("GPL"); |