Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/nfc/port100.c

  1 /*
  2  * Sony NFC Port-100 Series driver
  3  * Copyright (c) 2013, Intel Corporation.
  4  *
  5  * Partly based/Inspired by Stephen Tiedemann's nfcpy
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms and conditions of the GNU General Public License,
  9  * version 2, as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 14  * more details.
 15  *
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/usb.h>
 20 #include <net/nfc/digital.h>
 21 
 22 #define VERSION "0.1"
 23 
 24 #define SONY_VENDOR_ID    0x054c
 25 #define RCS380_PRODUCT_ID 0x06c1
 26 
 27 #define PORT100_PROTOCOLS (NFC_PROTO_JEWEL_MASK    | \
 28                            NFC_PROTO_MIFARE_MASK   | \
 29                            NFC_PROTO_FELICA_MASK   | \
 30                            NFC_PROTO_NFC_DEP_MASK  | \
 31                            NFC_PROTO_ISO14443_MASK | \
 32                            NFC_PROTO_ISO14443_B_MASK)
 33 
 34 #define PORT100_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC | \
 35                               NFC_DIGITAL_DRV_CAPS_TG_CRC)
 36 
 37 /* Standard port100 frame definitions */
 38 #define PORT100_FRAME_HEADER_LEN (sizeof(struct port100_frame) \
 39                                   + 2) /* data[0] CC, data[1] SCC */
 40 #define PORT100_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
 41 
 42 #define PORT100_COMM_RF_HEAD_MAX_LEN (sizeof(struct port100_tg_comm_rf_cmd))
 43 
 44 /*
 45  * Max extended frame payload len, excluding CC and SCC
 46  * which are already in PORT100_FRAME_HEADER_LEN.
 47  */
 48 #define PORT100_FRAME_MAX_PAYLOAD_LEN 1001
 49 
 50 #define PORT100_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
 51                                     Postamble (1) */
 52 static u8 ack_frame[PORT100_FRAME_ACK_SIZE] = {
 53         0x00, 0x00, 0xff, 0x00, 0xff, 0x00
 54 };
 55 
 56 #define PORT100_FRAME_CHECKSUM(f) (f->data[le16_to_cpu(f->datalen)])
 57 #define PORT100_FRAME_POSTAMBLE(f) (f->data[le16_to_cpu(f->datalen) + 1])
 58 
 59 /* start of frame */
 60 #define PORT100_FRAME_SOF       0x00FF
 61 #define PORT100_FRAME_EXT       0xFFFF
 62 #define PORT100_FRAME_ACK       0x00FF
 63 
 64 /* Port-100 command: in or out */
 65 #define PORT100_FRAME_DIRECTION(f) (f->data[0]) /* CC */
 66 #define PORT100_FRAME_DIR_OUT 0xD6
 67 #define PORT100_FRAME_DIR_IN  0xD7
 68 
 69 /* Port-100 sub-command */
 70 #define PORT100_FRAME_CMD(f) (f->data[1]) /* SCC */
 71 
 72 #define PORT100_CMD_GET_FIRMWARE_VERSION 0x20
 73 #define PORT100_CMD_GET_COMMAND_TYPE     0x28
 74 #define PORT100_CMD_SET_COMMAND_TYPE     0x2A
 75 
 76 #define PORT100_CMD_IN_SET_RF       0x00
 77 #define PORT100_CMD_IN_SET_PROTOCOL 0x02
 78 #define PORT100_CMD_IN_COMM_RF      0x04
 79 
 80 #define PORT100_CMD_TG_SET_RF       0x40
 81 #define PORT100_CMD_TG_SET_PROTOCOL 0x42
 82 #define PORT100_CMD_TG_SET_RF_OFF   0x46
 83 #define PORT100_CMD_TG_COMM_RF      0x48
 84 
 85 #define PORT100_CMD_SWITCH_RF       0x06
 86 
 87 #define PORT100_CMD_RESPONSE(cmd) (cmd + 1)
 88 
 89 #define PORT100_CMD_TYPE_IS_SUPPORTED(mask, cmd_type) \
 90         ((mask) & (0x01 << (cmd_type)))
 91 #define PORT100_CMD_TYPE_0      0
 92 #define PORT100_CMD_TYPE_1      1
 93 
 94 #define PORT100_CMD_STATUS_OK      0x00
 95 #define PORT100_CMD_STATUS_TIMEOUT 0x80
 96 
 97 #define PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK 0x01
 98 #define PORT100_MDAA_TGT_WAS_ACTIVATED_MASK      0x02
 99 
100 struct port100;
101 
102 typedef void (*port100_send_async_complete_t)(struct port100 *dev, void *arg,
103                                               struct sk_buff *resp);
104 
105 /**
106  * Setting sets structure for in_set_rf command
107  *
108  * @in_*_set_number: Represent the entry indexes in the port-100 RF Base Table.
109  *              This table contains multiple RF setting sets required for RF
110  *              communication.
111  *
112  * @in_*_comm_type: Theses fields set the communication type to be used.
113  */
114 struct port100_in_rf_setting {
115         u8 in_send_set_number;
116         u8 in_send_comm_type;
117         u8 in_recv_set_number;
118         u8 in_recv_comm_type;
119 } __packed;
120 
121 #define PORT100_COMM_TYPE_IN_212F 0x01
122 #define PORT100_COMM_TYPE_IN_424F 0x02
123 #define PORT100_COMM_TYPE_IN_106A 0x03
124 #define PORT100_COMM_TYPE_IN_106B 0x07
125 
126 static const struct port100_in_rf_setting in_rf_settings[] = {
127         [NFC_DIGITAL_RF_TECH_212F] = {
128                 .in_send_set_number = 1,
129                 .in_send_comm_type  = PORT100_COMM_TYPE_IN_212F,
130                 .in_recv_set_number = 15,
131                 .in_recv_comm_type  = PORT100_COMM_TYPE_IN_212F,
132         },
133         [NFC_DIGITAL_RF_TECH_424F] = {
134                 .in_send_set_number = 1,
135                 .in_send_comm_type  = PORT100_COMM_TYPE_IN_424F,
136                 .in_recv_set_number = 15,
137                 .in_recv_comm_type  = PORT100_COMM_TYPE_IN_424F,
138         },
139         [NFC_DIGITAL_RF_TECH_106A] = {
140                 .in_send_set_number = 2,
141                 .in_send_comm_type  = PORT100_COMM_TYPE_IN_106A,
142                 .in_recv_set_number = 15,
143                 .in_recv_comm_type  = PORT100_COMM_TYPE_IN_106A,
144         },
145         [NFC_DIGITAL_RF_TECH_106B] = {
146                 .in_send_set_number = 3,
147                 .in_send_comm_type  = PORT100_COMM_TYPE_IN_106B,
148                 .in_recv_set_number = 15,
149                 .in_recv_comm_type  = PORT100_COMM_TYPE_IN_106B,
150         },
151         /* Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements */
152         [NFC_DIGITAL_RF_TECH_LAST] = { 0 },
153 };
154 
155 /**
156  * Setting sets structure for tg_set_rf command
157  *
158  * @tg_set_number: Represents the entry index in the port-100 RF Base Table.
159  *                 This table contains multiple RF setting sets required for RF
160  *                 communication. this field is used for both send and receive
161  *                 settings.
162  *
163  * @tg_comm_type: Sets the communication type to be used to send and receive
164  *                data.
165  */
166 struct port100_tg_rf_setting {
167         u8 tg_set_number;
168         u8 tg_comm_type;
169 } __packed;
170 
171 #define PORT100_COMM_TYPE_TG_106A 0x0B
172 #define PORT100_COMM_TYPE_TG_212F 0x0C
173 #define PORT100_COMM_TYPE_TG_424F 0x0D
174 
175 static const struct port100_tg_rf_setting tg_rf_settings[] = {
176         [NFC_DIGITAL_RF_TECH_106A] = {
177                 .tg_set_number = 8,
178                 .tg_comm_type = PORT100_COMM_TYPE_TG_106A,
179         },
180         [NFC_DIGITAL_RF_TECH_212F] = {
181                 .tg_set_number = 8,
182                 .tg_comm_type = PORT100_COMM_TYPE_TG_212F,
183         },
184         [NFC_DIGITAL_RF_TECH_424F] = {
185                 .tg_set_number = 8,
186                 .tg_comm_type = PORT100_COMM_TYPE_TG_424F,
187         },
188         /* Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements */
189         [NFC_DIGITAL_RF_TECH_LAST] = { 0 },
190 
191 };
192 
193 #define PORT100_IN_PROT_INITIAL_GUARD_TIME      0x00
194 #define PORT100_IN_PROT_ADD_CRC                 0x01
195 #define PORT100_IN_PROT_CHECK_CRC               0x02
196 #define PORT100_IN_PROT_MULTI_CARD              0x03
197 #define PORT100_IN_PROT_ADD_PARITY              0x04
198 #define PORT100_IN_PROT_CHECK_PARITY            0x05
199 #define PORT100_IN_PROT_BITWISE_AC_RECV_MODE    0x06
200 #define PORT100_IN_PROT_VALID_BIT_NUMBER        0x07
201 #define PORT100_IN_PROT_CRYPTO1                 0x08
202 #define PORT100_IN_PROT_ADD_SOF                 0x09
203 #define PORT100_IN_PROT_CHECK_SOF               0x0A
204 #define PORT100_IN_PROT_ADD_EOF                 0x0B
205 #define PORT100_IN_PROT_CHECK_EOF               0x0C
206 #define PORT100_IN_PROT_DEAF_TIME               0x0E
207 #define PORT100_IN_PROT_CRM                     0x0F
208 #define PORT100_IN_PROT_CRM_MIN_LEN             0x10
209 #define PORT100_IN_PROT_T1_TAG_FRAME            0x11
210 #define PORT100_IN_PROT_RFCA                    0x12
211 #define PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR 0x13
212 #define PORT100_IN_PROT_END                     0x14
213 
214 #define PORT100_IN_MAX_NUM_PROTOCOLS            19
215 
216 #define PORT100_TG_PROT_TU           0x00
217 #define PORT100_TG_PROT_RF_OFF       0x01
218 #define PORT100_TG_PROT_CRM          0x02
219 #define PORT100_TG_PROT_END          0x03
220 
221 #define PORT100_TG_MAX_NUM_PROTOCOLS 3
222 
223 struct port100_protocol {
224         u8 number;
225         u8 value;
226 } __packed;
227 
228 static struct port100_protocol
229 in_protocols[][PORT100_IN_MAX_NUM_PROTOCOLS + 1] = {
230         [NFC_DIGITAL_FRAMING_NFCA_SHORT] = {
231                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
232                 { PORT100_IN_PROT_ADD_CRC,                 0 },
233                 { PORT100_IN_PROT_CHECK_CRC,               0 },
234                 { PORT100_IN_PROT_MULTI_CARD,              0 },
235                 { PORT100_IN_PROT_ADD_PARITY,              0 },
236                 { PORT100_IN_PROT_CHECK_PARITY,            1 },
237                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
238                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        7 },
239                 { PORT100_IN_PROT_CRYPTO1,                 0 },
240                 { PORT100_IN_PROT_ADD_SOF,                 0 },
241                 { PORT100_IN_PROT_CHECK_SOF,               0 },
242                 { PORT100_IN_PROT_ADD_EOF,                 0 },
243                 { PORT100_IN_PROT_CHECK_EOF,               0 },
244                 { PORT100_IN_PROT_DEAF_TIME,               4 },
245                 { PORT100_IN_PROT_CRM,                     0 },
246                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
247                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
248                 { PORT100_IN_PROT_RFCA,                    0 },
249                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
250                 { PORT100_IN_PROT_END,                     0 },
251         },
252         [NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {
253                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
254                 { PORT100_IN_PROT_ADD_CRC,                 0 },
255                 { PORT100_IN_PROT_CHECK_CRC,               0 },
256                 { PORT100_IN_PROT_MULTI_CARD,              0 },
257                 { PORT100_IN_PROT_ADD_PARITY,              1 },
258                 { PORT100_IN_PROT_CHECK_PARITY,            1 },
259                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
260                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
261                 { PORT100_IN_PROT_CRYPTO1,                 0 },
262                 { PORT100_IN_PROT_ADD_SOF,                 0 },
263                 { PORT100_IN_PROT_CHECK_SOF,               0 },
264                 { PORT100_IN_PROT_ADD_EOF,                 0 },
265                 { PORT100_IN_PROT_CHECK_EOF,               0 },
266                 { PORT100_IN_PROT_DEAF_TIME,               4 },
267                 { PORT100_IN_PROT_CRM,                     0 },
268                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
269                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
270                 { PORT100_IN_PROT_RFCA,                    0 },
271                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
272                 { PORT100_IN_PROT_END,                     0 },
273         },
274         [NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {
275                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
276                 { PORT100_IN_PROT_ADD_CRC,                 1 },
277                 { PORT100_IN_PROT_CHECK_CRC,               1 },
278                 { PORT100_IN_PROT_MULTI_CARD,              0 },
279                 { PORT100_IN_PROT_ADD_PARITY,              1 },
280                 { PORT100_IN_PROT_CHECK_PARITY,            1 },
281                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
282                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
283                 { PORT100_IN_PROT_CRYPTO1,                 0 },
284                 { PORT100_IN_PROT_ADD_SOF,                 0 },
285                 { PORT100_IN_PROT_CHECK_SOF,               0 },
286                 { PORT100_IN_PROT_ADD_EOF,                 0 },
287                 { PORT100_IN_PROT_CHECK_EOF,               0 },
288                 { PORT100_IN_PROT_DEAF_TIME,               4 },
289                 { PORT100_IN_PROT_CRM,                     0 },
290                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
291                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
292                 { PORT100_IN_PROT_RFCA,                    0 },
293                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
294                 { PORT100_IN_PROT_END,                     0 },
295         },
296         [NFC_DIGITAL_FRAMING_NFCA_T1T] = {
297                 /* nfc_digital_framing_nfca_short */
298                 { PORT100_IN_PROT_ADD_CRC,          2 },
299                 { PORT100_IN_PROT_CHECK_CRC,        2 },
300                 { PORT100_IN_PROT_VALID_BIT_NUMBER, 8 },
301                 { PORT100_IN_PROT_T1_TAG_FRAME,     2 },
302                 { PORT100_IN_PROT_END,              0 },
303         },
304         [NFC_DIGITAL_FRAMING_NFCA_T2T] = {
305                 /* nfc_digital_framing_nfca_standard */
306                 { PORT100_IN_PROT_ADD_CRC,   1 },
307                 { PORT100_IN_PROT_CHECK_CRC, 0 },
308                 { PORT100_IN_PROT_END,       0 },
309         },
310         [NFC_DIGITAL_FRAMING_NFCA_T4T] = {
311                 /* nfc_digital_framing_nfca_standard_with_crc_a */
312                 { PORT100_IN_PROT_END,       0 },
313         },
314         [NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {
315                 /* nfc_digital_framing_nfca_standard */
316                 { PORT100_IN_PROT_END, 0 },
317         },
318         [NFC_DIGITAL_FRAMING_NFCF] = {
319                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,     18 },
320                 { PORT100_IN_PROT_ADD_CRC,                 1 },
321                 { PORT100_IN_PROT_CHECK_CRC,               1 },
322                 { PORT100_IN_PROT_MULTI_CARD,              0 },
323                 { PORT100_IN_PROT_ADD_PARITY,              0 },
324                 { PORT100_IN_PROT_CHECK_PARITY,            0 },
325                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
326                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
327                 { PORT100_IN_PROT_CRYPTO1,                 0 },
328                 { PORT100_IN_PROT_ADD_SOF,                 0 },
329                 { PORT100_IN_PROT_CHECK_SOF,               0 },
330                 { PORT100_IN_PROT_ADD_EOF,                 0 },
331                 { PORT100_IN_PROT_CHECK_EOF,               0 },
332                 { PORT100_IN_PROT_DEAF_TIME,               4 },
333                 { PORT100_IN_PROT_CRM,                     0 },
334                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
335                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
336                 { PORT100_IN_PROT_RFCA,                    0 },
337                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
338                 { PORT100_IN_PROT_END,                     0 },
339         },
340         [NFC_DIGITAL_FRAMING_NFCF_T3T] = {
341                 /* nfc_digital_framing_nfcf */
342                 { PORT100_IN_PROT_END, 0 },
343         },
344         [NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
345                 /* nfc_digital_framing_nfcf */
346                 { PORT100_IN_PROT_END, 0 },
347         },
348         [NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
349                 { PORT100_IN_PROT_END, 0 },
350         },
351         [NFC_DIGITAL_FRAMING_NFCB] = {
352                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,     20 },
353                 { PORT100_IN_PROT_ADD_CRC,                 1 },
354                 { PORT100_IN_PROT_CHECK_CRC,               1 },
355                 { PORT100_IN_PROT_MULTI_CARD,              0 },
356                 { PORT100_IN_PROT_ADD_PARITY,              0 },
357                 { PORT100_IN_PROT_CHECK_PARITY,            0 },
358                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
359                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
360                 { PORT100_IN_PROT_CRYPTO1,                 0 },
361                 { PORT100_IN_PROT_ADD_SOF,                 1 },
362                 { PORT100_IN_PROT_CHECK_SOF,               1 },
363                 { PORT100_IN_PROT_ADD_EOF,                 1 },
364                 { PORT100_IN_PROT_CHECK_EOF,               1 },
365                 { PORT100_IN_PROT_DEAF_TIME,               4 },
366                 { PORT100_IN_PROT_CRM,                     0 },
367                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
368                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
369                 { PORT100_IN_PROT_RFCA,                    0 },
370                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
371                 { PORT100_IN_PROT_END,                     0 },
372         },
373         [NFC_DIGITAL_FRAMING_NFCB_T4T] = {
374                 /* nfc_digital_framing_nfcb */
375                 { PORT100_IN_PROT_END,                     0 },
376         },
377         /* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
378         [NFC_DIGITAL_FRAMING_LAST] = {
379                 { PORT100_IN_PROT_END, 0 },
380         },
381 };
382 
383 static struct port100_protocol
384 tg_protocols[][PORT100_TG_MAX_NUM_PROTOCOLS + 1] = {
385         [NFC_DIGITAL_FRAMING_NFCA_SHORT] = {
386                 { PORT100_TG_PROT_END, 0 },
387         },
388         [NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {
389                 { PORT100_TG_PROT_END, 0 },
390         },
391         [NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {
392                 { PORT100_TG_PROT_END, 0 },
393         },
394         [NFC_DIGITAL_FRAMING_NFCA_T1T] = {
395                 { PORT100_TG_PROT_END, 0 },
396         },
397         [NFC_DIGITAL_FRAMING_NFCA_T2T] = {
398                 { PORT100_TG_PROT_END, 0 },
399         },
400         [NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {
401                 { PORT100_TG_PROT_TU,     1 },
402                 { PORT100_TG_PROT_RF_OFF, 0 },
403                 { PORT100_TG_PROT_CRM,    7 },
404                 { PORT100_TG_PROT_END,    0 },
405         },
406         [NFC_DIGITAL_FRAMING_NFCF] = {
407                 { PORT100_TG_PROT_END, 0 },
408         },
409         [NFC_DIGITAL_FRAMING_NFCF_T3T] = {
410                 { PORT100_TG_PROT_END, 0 },
411         },
412         [NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
413                 { PORT100_TG_PROT_TU,     1 },
414                 { PORT100_TG_PROT_RF_OFF, 0 },
415                 { PORT100_TG_PROT_CRM,    7 },
416                 { PORT100_TG_PROT_END,    0 },
417         },
418         [NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
419                 { PORT100_TG_PROT_RF_OFF, 1 },
420                 { PORT100_TG_PROT_END,    0 },
421         },
422         /* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
423         [NFC_DIGITAL_FRAMING_LAST] = {
424                 { PORT100_TG_PROT_END,    0 },
425         },
426 };
427 
428 struct port100 {
429         struct nfc_digital_dev *nfc_digital_dev;
430 
431         int skb_headroom;
432         int skb_tailroom;
433 
434         struct usb_device *udev;
435         struct usb_interface *interface;
436 
437         struct urb *out_urb;
438         struct urb *in_urb;
439 
440         struct work_struct cmd_complete_work;
441 
442         u8 cmd_type;
443 
444         /* The digital stack serializes commands to be sent. There is no need
445          * for any queuing/locking mechanism at driver level.
446          */
447         struct port100_cmd *cmd;
448 };
449 
450 struct port100_cmd {
451         u8 code;
452         int status;
453         struct sk_buff *req;
454         struct sk_buff *resp;
455         int resp_len;
456         port100_send_async_complete_t  complete_cb;
457         void *complete_cb_context;
458 };
459 
460 struct port100_frame {
461         u8 preamble;
462         __be16 start_frame;
463         __be16 extended_frame;
464         __le16 datalen;
465         u8 datalen_checksum;
466         u8 data[];
467 } __packed;
468 
469 struct port100_ack_frame {
470         u8 preamble;
471         __be16 start_frame;
472         __be16 ack_frame;
473         u8 postambule;
474 } __packed;
475 
476 struct port100_cb_arg {
477         nfc_digital_cmd_complete_t complete_cb;
478         void *complete_arg;
479         u8 mdaa;
480 };
481 
482 struct port100_tg_comm_rf_cmd {
483         __le16 guard_time;
484         __le16 send_timeout;
485         u8 mdaa;
486         u8 nfca_param[6];
487         u8 nfcf_param[18];
488         u8 mf_halted;
489         u8 arae_flag;
490         __le16 recv_timeout;
491         u8 data[];
492 } __packed;
493 
494 struct port100_tg_comm_rf_res {
495         u8 comm_type;
496         u8 ar_status;
497         u8 target_activated;
498         __le32 status;
499         u8 data[];
500 } __packed;
501 
502 /* The rule: value + checksum = 0 */
503 static inline u8 port100_checksum(u16 value)
504 {
505         return ~(((u8 *)&value)[0] + ((u8 *)&value)[1]) + 1;
506 }
507 
508 /* The rule: sum(data elements) + checksum = 0 */
509 static u8 port100_data_checksum(u8 *data, int datalen)
510 {
511         u8 sum = 0;
512         int i;
513 
514         for (i = 0; i < datalen; i++)
515                 sum += data[i];
516 
517         return port100_checksum(sum);
518 }
519 
520 static void port100_tx_frame_init(void *_frame, u8 cmd_code)
521 {
522         struct port100_frame *frame = _frame;
523 
524         frame->preamble = 0;
525         frame->start_frame = cpu_to_be16(PORT100_FRAME_SOF);
526         frame->extended_frame = cpu_to_be16(PORT100_FRAME_EXT);
527         PORT100_FRAME_DIRECTION(frame) = PORT100_FRAME_DIR_OUT;
528         PORT100_FRAME_CMD(frame) = cmd_code;
529         frame->datalen = cpu_to_le16(2);
530 }
531 
532 static void port100_tx_frame_finish(void *_frame)
533 {
534         struct port100_frame *frame = _frame;
535 
536         frame->datalen_checksum = port100_checksum(le16_to_cpu(frame->datalen));
537 
538         PORT100_FRAME_CHECKSUM(frame) =
539                 port100_data_checksum(frame->data, le16_to_cpu(frame->datalen));
540 
541         PORT100_FRAME_POSTAMBLE(frame) = 0;
542 }
543 
544 static void port100_tx_update_payload_len(void *_frame, int len)
545 {
546         struct port100_frame *frame = _frame;
547 
548         frame->datalen = cpu_to_le16(le16_to_cpu(frame->datalen) + len);
549 }
550 
551 static bool port100_rx_frame_is_valid(void *_frame)
552 {
553         u8 checksum;
554         struct port100_frame *frame = _frame;
555 
556         if (frame->start_frame != cpu_to_be16(PORT100_FRAME_SOF) ||
557             frame->extended_frame != cpu_to_be16(PORT100_FRAME_EXT))
558                 return false;
559 
560         checksum = port100_checksum(le16_to_cpu(frame->datalen));
561         if (checksum != frame->datalen_checksum)
562                 return false;
563 
564         checksum = port100_data_checksum(frame->data,
565                                          le16_to_cpu(frame->datalen));
566         if (checksum != PORT100_FRAME_CHECKSUM(frame))
567                 return false;
568 
569         return true;
570 }
571 
572 static bool port100_rx_frame_is_ack(struct port100_ack_frame *frame)
573 {
574         return (frame->start_frame == cpu_to_be16(PORT100_FRAME_SOF) &&
575                 frame->ack_frame == cpu_to_be16(PORT100_FRAME_ACK));
576 }
577 
578 static inline int port100_rx_frame_size(void *frame)
579 {
580         struct port100_frame *f = frame;
581 
582         return sizeof(struct port100_frame) + le16_to_cpu(f->datalen) +
583                PORT100_FRAME_TAIL_LEN;
584 }
585 
586 static bool port100_rx_frame_is_cmd_response(struct port100 *dev, void *frame)
587 {
588         struct port100_frame *f = frame;
589 
590         return (PORT100_FRAME_CMD(f) == PORT100_CMD_RESPONSE(dev->cmd->code));
591 }
592 
593 static void port100_recv_response(struct urb *urb)
594 {
595         struct port100 *dev = urb->context;
596         struct port100_cmd *cmd = dev->cmd;
597         u8 *in_frame;
598 
599         cmd->status = urb->status;
600 
601         switch (urb->status) {
602         case 0:
603                 break; /* success */
604         case -ECONNRESET:
605         case -ENOENT:
606                 nfc_err(&dev->interface->dev,
607                         "The urb has been canceled (status %d)", urb->status);
608                 goto sched_wq;
609         case -ESHUTDOWN:
610         default:
611                 nfc_err(&dev->interface->dev, "Urb failure (status %d)",
612                         urb->status);
613                 goto sched_wq;
614         }
615 
616         in_frame = dev->in_urb->transfer_buffer;
617 
618         if (!port100_rx_frame_is_valid(in_frame)) {
619                 nfc_err(&dev->interface->dev, "Received an invalid frame");
620                 cmd->status = -EIO;
621                 goto sched_wq;
622         }
623 
624         print_hex_dump_debug("PORT100 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
625                              port100_rx_frame_size(in_frame), false);
626 
627         if (!port100_rx_frame_is_cmd_response(dev, in_frame)) {
628                 nfc_err(&dev->interface->dev,
629                         "It's not the response to the last command");
630                 cmd->status = -EIO;
631                 goto sched_wq;
632         }
633 
634 sched_wq:
635         schedule_work(&dev->cmd_complete_work);
636 }
637 
638 static int port100_submit_urb_for_response(struct port100 *dev, gfp_t flags)
639 {
640         dev->in_urb->complete = port100_recv_response;
641 
642         return usb_submit_urb(dev->in_urb, flags);
643 }
644 
645 static void port100_recv_ack(struct urb *urb)
646 {
647         struct port100 *dev = urb->context;
648         struct port100_cmd *cmd = dev->cmd;
649         struct port100_ack_frame *in_frame;
650         int rc;
651 
652         cmd->status = urb->status;
653 
654         switch (urb->status) {
655         case 0:
656                 break; /* success */
657         case -ECONNRESET:
658         case -ENOENT:
659                 nfc_err(&dev->interface->dev,
660                         "The urb has been stopped (status %d)", urb->status);
661                 goto sched_wq;
662         case -ESHUTDOWN:
663         default:
664                 nfc_err(&dev->interface->dev, "Urb failure (status %d)",
665                         urb->status);
666                 goto sched_wq;
667         }
668 
669         in_frame = dev->in_urb->transfer_buffer;
670 
671         if (!port100_rx_frame_is_ack(in_frame)) {
672                 nfc_err(&dev->interface->dev, "Received an invalid ack");
673                 cmd->status = -EIO;
674                 goto sched_wq;
675         }
676 
677         rc = port100_submit_urb_for_response(dev, GFP_ATOMIC);
678         if (rc) {
679                 nfc_err(&dev->interface->dev,
680                         "usb_submit_urb failed with result %d", rc);
681                 cmd->status = rc;
682                 goto sched_wq;
683         }
684 
685         return;
686 
687 sched_wq:
688         schedule_work(&dev->cmd_complete_work);
689 }
690 
691 static int port100_submit_urb_for_ack(struct port100 *dev, gfp_t flags)
692 {
693         dev->in_urb->complete = port100_recv_ack;
694 
695         return usb_submit_urb(dev->in_urb, flags);
696 }
697 
698 static int port100_send_ack(struct port100 *dev)
699 {
700         int rc;
701 
702         dev->out_urb->transfer_buffer = ack_frame;
703         dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
704         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
705 
706         return rc;
707 }
708 
709 static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
710                                     struct sk_buff *in, int in_len)
711 {
712         int rc;
713 
714         dev->out_urb->transfer_buffer = out->data;
715         dev->out_urb->transfer_buffer_length = out->len;
716 
717         dev->in_urb->transfer_buffer = in->data;
718         dev->in_urb->transfer_buffer_length = in_len;
719 
720         print_hex_dump_debug("PORT100 TX: ", DUMP_PREFIX_NONE, 16, 1,
721                              out->data, out->len, false);
722 
723         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
724         if (rc)
725                 return rc;
726 
727         rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
728         if (rc)
729                 goto error;
730 
731         return 0;
732 
733 error:
734         usb_unlink_urb(dev->out_urb);
735         return rc;
736 }
737 
738 static void port100_build_cmd_frame(struct port100 *dev, u8 cmd_code,
739                                     struct sk_buff *skb)
740 {
741         /* payload is already there, just update datalen */
742         int payload_len = skb->len;
743 
744         skb_push(skb, PORT100_FRAME_HEADER_LEN);
745         skb_put(skb, PORT100_FRAME_TAIL_LEN);
746 
747         port100_tx_frame_init(skb->data, cmd_code);
748         port100_tx_update_payload_len(skb->data, payload_len);
749         port100_tx_frame_finish(skb->data);
750 }
751 
752 static void port100_send_async_complete(struct port100 *dev)
753 {
754         struct port100_cmd *cmd = dev->cmd;
755         int status = cmd->status;
756 
757         struct sk_buff *req = cmd->req;
758         struct sk_buff *resp = cmd->resp;
759 
760         dev_kfree_skb(req);
761 
762         dev->cmd = NULL;
763 
764         if (status < 0) {
765                 cmd->complete_cb(dev, cmd->complete_cb_context,
766                                  ERR_PTR(status));
767                 dev_kfree_skb(resp);
768                 goto done;
769         }
770 
771         skb_put(resp, port100_rx_frame_size(resp->data));
772         skb_pull(resp, PORT100_FRAME_HEADER_LEN);
773         skb_trim(resp, resp->len - PORT100_FRAME_TAIL_LEN);
774 
775         cmd->complete_cb(dev, cmd->complete_cb_context, resp);
776 
777 done:
778         kfree(cmd);
779 }
780 
781 static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
782                                 struct sk_buff *req,
783                                 port100_send_async_complete_t complete_cb,
784                                 void *complete_cb_context)
785 {
786         struct port100_cmd *cmd;
787         struct sk_buff *resp;
788         int rc;
789         int  resp_len = PORT100_FRAME_HEADER_LEN +
790                         PORT100_FRAME_MAX_PAYLOAD_LEN +
791                         PORT100_FRAME_TAIL_LEN;
792 
793         resp = alloc_skb(resp_len, GFP_KERNEL);
794         if (!resp)
795                 return -ENOMEM;
796 
797         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
798         if (!cmd) {
799                 dev_kfree_skb(resp);
800                 return -ENOMEM;
801         }
802 
803         cmd->code = cmd_code;
804         cmd->req = req;
805         cmd->resp = resp;
806         cmd->resp_len = resp_len;
807         cmd->complete_cb = complete_cb;
808         cmd->complete_cb_context = complete_cb_context;
809 
810         port100_build_cmd_frame(dev, cmd_code, req);
811 
812         dev->cmd = cmd;
813 
814         rc = port100_send_frame_async(dev, req, resp, resp_len);
815         if (rc) {
816                 kfree(cmd);
817                 dev_kfree_skb(resp);
818                 dev->cmd = NULL;
819         }
820 
821         return rc;
822 }
823 
824 struct port100_sync_cmd_response {
825         struct sk_buff *resp;
826         struct completion done;
827 };
828 
829 static void port100_wq_cmd_complete(struct work_struct *work)
830 {
831         struct port100 *dev = container_of(work, struct port100,
832                                            cmd_complete_work);
833 
834         port100_send_async_complete(dev);
835 }
836 
837 static void port100_send_sync_complete(struct port100 *dev, void *_arg,
838                                       struct sk_buff *resp)
839 {
840         struct port100_sync_cmd_response *arg = _arg;
841 
842         arg->resp = resp;
843         complete(&arg->done);
844 }
845 
846 static struct sk_buff *port100_send_cmd_sync(struct port100 *dev, u8 cmd_code,
847                                              struct sk_buff *req)
848 {
849         int rc;
850         struct port100_sync_cmd_response arg;
851 
852         init_completion(&arg.done);
853 
854         rc = port100_send_cmd_async(dev, cmd_code, req,
855                                     port100_send_sync_complete, &arg);
856         if (rc) {
857                 dev_kfree_skb(req);
858                 return ERR_PTR(rc);
859         }
860 
861         wait_for_completion(&arg.done);
862 
863         return arg.resp;
864 }
865 
866 static void port100_send_complete(struct urb *urb)
867 {
868         struct port100 *dev = urb->context;
869 
870         switch (urb->status) {
871         case 0:
872                 break; /* success */
873         case -ECONNRESET:
874         case -ENOENT:
875                 nfc_err(&dev->interface->dev,
876                         "The urb has been stopped (status %d)", urb->status);
877                 break;
878         case -ESHUTDOWN:
879         default:
880                 nfc_err(&dev->interface->dev, "Urb failure (status %d)",
881                         urb->status);
882         }
883 }
884 
885 static void port100_abort_cmd(struct nfc_digital_dev *ddev)
886 {
887         struct port100 *dev = nfc_digital_get_drvdata(ddev);
888 
889         /* An ack will cancel the last issued command */
890         port100_send_ack(dev);
891 
892         /* cancel the urb request */
893         usb_kill_urb(dev->in_urb);
894 }
895 
896 static struct sk_buff *port100_alloc_skb(struct port100 *dev, unsigned int size)
897 {
898         struct sk_buff *skb;
899 
900         skb = alloc_skb(dev->skb_headroom + dev->skb_tailroom + size,
901                         GFP_KERNEL);
902         if (skb)
903                 skb_reserve(skb, dev->skb_headroom);
904 
905         return skb;
906 }
907 
908 static int port100_set_command_type(struct port100 *dev, u8 command_type)
909 {
910         struct sk_buff *skb;
911         struct sk_buff *resp;
912         int rc;
913 
914         skb = port100_alloc_skb(dev, 1);
915         if (!skb)
916                 return -ENOMEM;
917 
918         *skb_put(skb, sizeof(u8)) = command_type;
919 
920         resp = port100_send_cmd_sync(dev, PORT100_CMD_SET_COMMAND_TYPE, skb);
921         if (IS_ERR(resp))
922                 return PTR_ERR(resp);
923 
924         rc = resp->data[0];
925 
926         dev_kfree_skb(resp);
927 
928         return rc;
929 }
930 
931 static u64 port100_get_command_type_mask(struct port100 *dev)
932 {
933         struct sk_buff *skb;
934         struct sk_buff *resp;
935         u64 mask;
936 
937         skb = port100_alloc_skb(dev, 0);
938         if (!skb)
939                 return -ENOMEM;
940 
941         resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_COMMAND_TYPE, skb);
942         if (IS_ERR(resp))
943                 return PTR_ERR(resp);
944 
945         if (resp->len < 8)
946                 mask = 0;
947         else
948                 mask = be64_to_cpu(*(__be64 *)resp->data);
949 
950         dev_kfree_skb(resp);
951 
952         return mask;
953 }
954 
955 static u16 port100_get_firmware_version(struct port100 *dev)
956 {
957         struct sk_buff *skb;
958         struct sk_buff *resp;
959         u16 fw_ver;
960 
961         skb = port100_alloc_skb(dev, 0);
962         if (!skb)
963                 return 0;
964 
965         resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_FIRMWARE_VERSION,
966                                      skb);
967         if (IS_ERR(resp))
968                 return 0;
969 
970         fw_ver = le16_to_cpu(*(__le16 *)resp->data);
971 
972         dev_kfree_skb(resp);
973 
974         return fw_ver;
975 }
976 
977 static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
978 {
979         struct port100 *dev = nfc_digital_get_drvdata(ddev);
980         struct sk_buff *skb, *resp;
981 
982         skb = port100_alloc_skb(dev, 1);
983         if (!skb)
984                 return -ENOMEM;
985 
986         *skb_put(skb, 1) = on ? 1 : 0;
987 
988         resp = port100_send_cmd_sync(dev, PORT100_CMD_SWITCH_RF, skb);
989 
990         if (IS_ERR(resp))
991                 return PTR_ERR(resp);
992 
993         dev_kfree_skb(resp);
994 
995         return 0;
996 }
997 
998 static int port100_in_set_rf(struct nfc_digital_dev *ddev, u8 rf)
999 {
1000         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1001         struct sk_buff *skb;
1002         struct sk_buff *resp;
1003         int rc;
1004 
1005         if (rf >= NFC_DIGITAL_RF_TECH_LAST)
1006                 return -EINVAL;
1007 
1008         skb = port100_alloc_skb(dev, sizeof(struct port100_in_rf_setting));
1009         if (!skb)
1010                 return -ENOMEM;
1011 
1012         memcpy(skb_put(skb, sizeof(struct port100_in_rf_setting)),
1013                &in_rf_settings[rf],
1014                sizeof(struct port100_in_rf_setting));
1015 
1016         resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_RF, skb);
1017 
1018         if (IS_ERR(resp))
1019                 return PTR_ERR(resp);
1020 
1021         rc = resp->data[0];
1022 
1023         dev_kfree_skb(resp);
1024 
1025         return rc;
1026 }
1027 
1028 static int port100_in_set_framing(struct nfc_digital_dev *ddev, int param)
1029 {
1030         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1031         struct port100_protocol *protocols;
1032         struct sk_buff *skb;
1033         struct sk_buff *resp;
1034         int num_protocols;
1035         size_t size;
1036         int rc;
1037 
1038         if (param >= NFC_DIGITAL_FRAMING_LAST)
1039                 return -EINVAL;
1040 
1041         protocols = in_protocols[param];
1042 
1043         num_protocols = 0;
1044         while (protocols[num_protocols].number != PORT100_IN_PROT_END)
1045                 num_protocols++;
1046 
1047         if (!num_protocols)
1048                 return 0;
1049 
1050         size = sizeof(struct port100_protocol) * num_protocols;
1051 
1052         skb = port100_alloc_skb(dev, size);
1053         if (!skb)
1054                 return -ENOMEM;
1055 
1056         memcpy(skb_put(skb, size), protocols, size);
1057 
1058         resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_PROTOCOL, skb);
1059 
1060         if (IS_ERR(resp))
1061                 return PTR_ERR(resp);
1062 
1063         rc = resp->data[0];
1064 
1065         dev_kfree_skb(resp);
1066 
1067         return rc;
1068 }
1069 
1070 static int port100_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1071                                    int param)
1072 {
1073         if (type == NFC_DIGITAL_CONFIG_RF_TECH)
1074                 return port100_in_set_rf(ddev, param);
1075 
1076         if (type == NFC_DIGITAL_CONFIG_FRAMING)
1077                 return port100_in_set_framing(ddev, param);
1078 
1079         return -EINVAL;
1080 }
1081 
1082 static void port100_in_comm_rf_complete(struct port100 *dev, void *arg,
1083                                        struct sk_buff *resp)
1084 {
1085         struct port100_cb_arg *cb_arg = arg;
1086         nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
1087         u32 status;
1088         int rc;
1089 
1090         if (IS_ERR(resp)) {
1091                 rc =  PTR_ERR(resp);
1092                 goto exit;
1093         }
1094 
1095         if (resp->len < 4) {
1096                 nfc_err(&dev->interface->dev,
1097                         "Invalid packet length received.\n");
1098                 rc = -EIO;
1099                 goto error;
1100         }
1101 
1102         status = le32_to_cpu(*(__le32 *)resp->data);
1103 
1104         skb_pull(resp, sizeof(u32));
1105 
1106         if (status == PORT100_CMD_STATUS_TIMEOUT) {
1107                 rc = -ETIMEDOUT;
1108                 goto error;
1109         }
1110 
1111         if (status != PORT100_CMD_STATUS_OK) {
1112                 nfc_err(&dev->interface->dev,
1113                         "in_comm_rf failed with status 0x%08x\n", status);
1114                 rc = -EIO;
1115                 goto error;
1116         }
1117 
1118         /* Remove collision bits byte */
1119         skb_pull(resp, 1);
1120 
1121         goto exit;
1122 
1123 error:
1124         kfree_skb(resp);
1125         resp = ERR_PTR(rc);
1126 
1127 exit:
1128         cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
1129 
1130         kfree(cb_arg);
1131 }
1132 
1133 static int port100_in_send_cmd(struct nfc_digital_dev *ddev,
1134                                struct sk_buff *skb, u16 _timeout,
1135                                nfc_digital_cmd_complete_t cb, void *arg)
1136 {
1137         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1138         struct port100_cb_arg *cb_arg;
1139         __le16 timeout;
1140 
1141         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1142         if (!cb_arg)
1143                 return -ENOMEM;
1144 
1145         cb_arg->complete_cb = cb;
1146         cb_arg->complete_arg = arg;
1147 
1148         timeout = cpu_to_le16(_timeout * 10);
1149 
1150         memcpy(skb_push(skb, sizeof(__le16)), &timeout, sizeof(__le16));
1151 
1152         return port100_send_cmd_async(dev, PORT100_CMD_IN_COMM_RF, skb,
1153                                       port100_in_comm_rf_complete, cb_arg);
1154 }
1155 
1156 static int port100_tg_set_rf(struct nfc_digital_dev *ddev, u8 rf)
1157 {
1158         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1159         struct sk_buff *skb;
1160         struct sk_buff *resp;
1161         int rc;
1162 
1163         if (rf >= NFC_DIGITAL_RF_TECH_LAST)
1164                 return -EINVAL;
1165 
1166         skb = port100_alloc_skb(dev, sizeof(struct port100_tg_rf_setting));
1167         if (!skb)
1168                 return -ENOMEM;
1169 
1170         memcpy(skb_put(skb, sizeof(struct port100_tg_rf_setting)),
1171                &tg_rf_settings[rf],
1172                sizeof(struct port100_tg_rf_setting));
1173 
1174         resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_RF, skb);
1175 
1176         if (IS_ERR(resp))
1177                 return PTR_ERR(resp);
1178 
1179         rc = resp->data[0];
1180 
1181         dev_kfree_skb(resp);
1182 
1183         return rc;
1184 }
1185 
1186 static int port100_tg_set_framing(struct nfc_digital_dev *ddev, int param)
1187 {
1188         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1189         struct port100_protocol *protocols;
1190         struct sk_buff *skb;
1191         struct sk_buff *resp;
1192         int rc;
1193         int num_protocols;
1194         size_t size;
1195 
1196         if (param >= NFC_DIGITAL_FRAMING_LAST)
1197                 return -EINVAL;
1198 
1199         protocols = tg_protocols[param];
1200 
1201         num_protocols = 0;
1202         while (protocols[num_protocols].number != PORT100_TG_PROT_END)
1203                 num_protocols++;
1204 
1205         if (!num_protocols)
1206                 return 0;
1207 
1208         size = sizeof(struct port100_protocol) * num_protocols;
1209 
1210         skb = port100_alloc_skb(dev, size);
1211         if (!skb)
1212                 return -ENOMEM;
1213 
1214         memcpy(skb_put(skb, size), protocols, size);
1215 
1216         resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_PROTOCOL, skb);
1217 
1218         if (IS_ERR(resp))
1219                 return PTR_ERR(resp);
1220 
1221         rc = resp->data[0];
1222 
1223         dev_kfree_skb(resp);
1224 
1225         return rc;
1226 }
1227 
1228 static int port100_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1229                                    int param)
1230 {
1231         if (type == NFC_DIGITAL_CONFIG_RF_TECH)
1232                 return port100_tg_set_rf(ddev, param);
1233 
1234         if (type == NFC_DIGITAL_CONFIG_FRAMING)
1235                 return port100_tg_set_framing(ddev, param);
1236 
1237         return -EINVAL;
1238 }
1239 
1240 static bool port100_tg_target_activated(struct port100 *dev, u8 tgt_activated)
1241 {
1242         u8 mask;
1243 
1244         switch (dev->cmd_type) {
1245         case PORT100_CMD_TYPE_0:
1246                 mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK;
1247                 break;
1248         case PORT100_CMD_TYPE_1:
1249                 mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK |
1250                        PORT100_MDAA_TGT_WAS_ACTIVATED_MASK;
1251                 break;
1252         default:
1253                 nfc_err(&dev->interface->dev, "Unknonwn command type.\n");
1254                 return false;
1255         }
1256 
1257         return ((tgt_activated & mask) == mask);
1258 }
1259 
1260 static void port100_tg_comm_rf_complete(struct port100 *dev, void *arg,
1261                                         struct sk_buff *resp)
1262 {
1263         u32 status;
1264         struct port100_cb_arg *cb_arg = arg;
1265         nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
1266         struct port100_tg_comm_rf_res *hdr;
1267 
1268         if (IS_ERR(resp))
1269                 goto exit;
1270 
1271         hdr = (struct port100_tg_comm_rf_res *)resp->data;
1272 
1273         status = le32_to_cpu(hdr->status);
1274 
1275         if (cb_arg->mdaa &&
1276             !port100_tg_target_activated(dev, hdr->target_activated)) {
1277                 kfree_skb(resp);
1278                 resp = ERR_PTR(-ETIMEDOUT);
1279 
1280                 goto exit;
1281         }
1282 
1283         skb_pull(resp, sizeof(struct port100_tg_comm_rf_res));
1284 
1285         if (status != PORT100_CMD_STATUS_OK) {
1286                 kfree_skb(resp);
1287 
1288                 if (status == PORT100_CMD_STATUS_TIMEOUT)
1289                         resp = ERR_PTR(-ETIMEDOUT);
1290                 else
1291                         resp = ERR_PTR(-EIO);
1292         }
1293 
1294 exit:
1295         cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
1296 
1297         kfree(cb_arg);
1298 }
1299 
1300 static int port100_tg_send_cmd(struct nfc_digital_dev *ddev,
1301                                struct sk_buff *skb, u16 timeout,
1302                                nfc_digital_cmd_complete_t cb, void *arg)
1303 {
1304         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1305         struct port100_tg_comm_rf_cmd *hdr;
1306         struct port100_cb_arg *cb_arg;
1307 
1308         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1309         if (!cb_arg)
1310                 return -ENOMEM;
1311 
1312         cb_arg->complete_cb = cb;
1313         cb_arg->complete_arg = arg;
1314 
1315         skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
1316 
1317         hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
1318 
1319         memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
1320         hdr->guard_time = cpu_to_le16(500);
1321         hdr->send_timeout = cpu_to_le16(0xFFFF);
1322         hdr->recv_timeout = cpu_to_le16(timeout);
1323 
1324         return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
1325                                       port100_tg_comm_rf_complete, cb_arg);
1326 }
1327 
1328 static int port100_listen_mdaa(struct nfc_digital_dev *ddev,
1329                                struct digital_tg_mdaa_params *params,
1330                                u16 timeout,
1331                                nfc_digital_cmd_complete_t cb, void *arg)
1332 {
1333         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1334         struct port100_tg_comm_rf_cmd *hdr;
1335         struct port100_cb_arg *cb_arg;
1336         struct sk_buff *skb;
1337         int rc;
1338 
1339         rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1340                                      NFC_DIGITAL_RF_TECH_106A);
1341         if (rc)
1342                 return rc;
1343 
1344         rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1345                                      NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1346         if (rc)
1347                 return rc;
1348 
1349         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1350         if (!cb_arg)
1351                 return -ENOMEM;
1352 
1353         cb_arg->complete_cb = cb;
1354         cb_arg->complete_arg = arg;
1355         cb_arg->mdaa = 1;
1356 
1357         skb = port100_alloc_skb(dev, 0);
1358         if (!skb) {
1359                 kfree(cb_arg);
1360                 return -ENOMEM;
1361         }
1362 
1363         skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
1364         hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
1365 
1366         memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
1367 
1368         hdr->guard_time = 0;
1369         hdr->send_timeout = cpu_to_le16(0xFFFF);
1370         hdr->mdaa = 1;
1371         hdr->nfca_param[0] = (params->sens_res >> 8) & 0xFF;
1372         hdr->nfca_param[1] = params->sens_res & 0xFF;
1373         memcpy(hdr->nfca_param + 2, params->nfcid1, 3);
1374         hdr->nfca_param[5] = params->sel_res;
1375         memcpy(hdr->nfcf_param, params->nfcid2, 8);
1376         hdr->nfcf_param[16] = (params->sc >> 8) & 0xFF;
1377         hdr->nfcf_param[17] = params->sc & 0xFF;
1378         hdr->recv_timeout = cpu_to_le16(timeout);
1379 
1380         return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
1381                                       port100_tg_comm_rf_complete, cb_arg);
1382 }
1383 
1384 static int port100_listen(struct nfc_digital_dev *ddev, u16 timeout,
1385                           nfc_digital_cmd_complete_t cb, void *arg)
1386 {
1387         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1388         struct sk_buff *skb;
1389 
1390         skb = port100_alloc_skb(dev, 0);
1391         if (!skb)
1392                 return -ENOMEM;
1393 
1394         return port100_tg_send_cmd(ddev, skb, timeout, cb, arg);
1395 }
1396 
1397 static struct nfc_digital_ops port100_digital_ops = {
1398         .in_configure_hw = port100_in_configure_hw,
1399         .in_send_cmd = port100_in_send_cmd,
1400 
1401         .tg_listen_mdaa = port100_listen_mdaa,
1402         .tg_listen = port100_listen,
1403         .tg_configure_hw = port100_tg_configure_hw,
1404         .tg_send_cmd = port100_tg_send_cmd,
1405 
1406         .switch_rf = port100_switch_rf,
1407         .abort_cmd = port100_abort_cmd,
1408 };
1409 
1410 static const struct usb_device_id port100_table[] = {
1411         { USB_DEVICE(SONY_VENDOR_ID, RCS380_PRODUCT_ID), },
1412         { }
1413 };
1414 MODULE_DEVICE_TABLE(usb, port100_table);
1415 
1416 static int port100_probe(struct usb_interface *interface,
1417                          const struct usb_device_id *id)
1418 {
1419         struct port100 *dev;
1420         int rc;
1421         struct usb_host_interface *iface_desc;
1422         struct usb_endpoint_descriptor *endpoint;
1423         int in_endpoint;
1424         int out_endpoint;
1425         u16 fw_version;
1426         u64 cmd_type_mask;
1427         int i;
1428 
1429         dev = devm_kzalloc(&interface->dev, sizeof(struct port100), GFP_KERNEL);
1430         if (!dev)
1431                 return -ENOMEM;
1432 
1433         dev->udev = usb_get_dev(interface_to_usbdev(interface));
1434         dev->interface = interface;
1435         usb_set_intfdata(interface, dev);
1436 
1437         in_endpoint = out_endpoint = 0;
1438         iface_desc = interface->cur_altsetting;
1439         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1440                 endpoint = &iface_desc->endpoint[i].desc;
1441 
1442                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
1443                         in_endpoint = endpoint->bEndpointAddress;
1444 
1445                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
1446                         out_endpoint = endpoint->bEndpointAddress;
1447         }
1448 
1449         if (!in_endpoint || !out_endpoint) {
1450                 nfc_err(&interface->dev,
1451                         "Could not find bulk-in or bulk-out endpoint\n");
1452                 rc = -ENODEV;
1453                 goto error;
1454         }
1455 
1456         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
1457         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
1458 
1459         if (!dev->in_urb || !dev->out_urb) {
1460                 nfc_err(&interface->dev, "Could not allocate USB URBs\n");
1461                 rc = -ENOMEM;
1462                 goto error;
1463         }
1464 
1465         usb_fill_bulk_urb(dev->in_urb, dev->udev,
1466                           usb_rcvbulkpipe(dev->udev, in_endpoint),
1467                           NULL, 0, NULL, dev);
1468         usb_fill_bulk_urb(dev->out_urb, dev->udev,
1469                           usb_sndbulkpipe(dev->udev, out_endpoint),
1470                           NULL, 0, port100_send_complete, dev);
1471 
1472         dev->skb_headroom = PORT100_FRAME_HEADER_LEN +
1473                             PORT100_COMM_RF_HEAD_MAX_LEN;
1474         dev->skb_tailroom = PORT100_FRAME_TAIL_LEN;
1475 
1476         INIT_WORK(&dev->cmd_complete_work, port100_wq_cmd_complete);
1477 
1478         /* The first thing to do with the Port-100 is to set the command type
1479          * to be used. If supported we use command type 1. 0 otherwise.
1480          */
1481         cmd_type_mask = port100_get_command_type_mask(dev);
1482         if (!cmd_type_mask) {
1483                 nfc_err(&interface->dev,
1484                         "Could not get supported command types.\n");
1485                 rc = -ENODEV;
1486                 goto error;
1487         }
1488 
1489         if (PORT100_CMD_TYPE_IS_SUPPORTED(cmd_type_mask, PORT100_CMD_TYPE_1))
1490                 dev->cmd_type = PORT100_CMD_TYPE_1;
1491         else
1492                 dev->cmd_type = PORT100_CMD_TYPE_0;
1493 
1494         rc = port100_set_command_type(dev, dev->cmd_type);
1495         if (rc) {
1496                 nfc_err(&interface->dev,
1497                         "The device does not support command type %u.\n",
1498                         dev->cmd_type);
1499                 goto error;
1500         }
1501 
1502         fw_version = port100_get_firmware_version(dev);
1503         if (!fw_version)
1504                 nfc_err(&interface->dev,
1505                         "Could not get device firmware version.\n");
1506 
1507         nfc_info(&interface->dev,
1508                  "Sony NFC Port-100 Series attached (firmware v%x.%02x)\n",
1509                  (fw_version & 0xFF00) >> 8, fw_version & 0xFF);
1510 
1511         dev->nfc_digital_dev = nfc_digital_allocate_device(&port100_digital_ops,
1512                                                            PORT100_PROTOCOLS,
1513                                                            PORT100_CAPABILITIES,
1514                                                            dev->skb_headroom,
1515                                                            dev->skb_tailroom);
1516         if (!dev->nfc_digital_dev) {
1517                 nfc_err(&interface->dev,
1518                         "Could not allocate nfc_digital_dev.\n");
1519                 rc = -ENOMEM;
1520                 goto error;
1521         }
1522 
1523         nfc_digital_set_parent_dev(dev->nfc_digital_dev, &interface->dev);
1524         nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
1525 
1526         rc = nfc_digital_register_device(dev->nfc_digital_dev);
1527         if (rc) {
1528                 nfc_err(&interface->dev,
1529                         "Could not register digital device.\n");
1530                 goto free_nfc_dev;
1531         }
1532 
1533         return 0;
1534 
1535 free_nfc_dev:
1536         nfc_digital_free_device(dev->nfc_digital_dev);
1537 
1538 error:
1539         usb_free_urb(dev->in_urb);
1540         usb_free_urb(dev->out_urb);
1541         usb_put_dev(dev->udev);
1542 
1543         return rc;
1544 }
1545 
1546 static void port100_disconnect(struct usb_interface *interface)
1547 {
1548         struct port100 *dev;
1549 
1550         dev = usb_get_intfdata(interface);
1551         usb_set_intfdata(interface, NULL);
1552 
1553         nfc_digital_unregister_device(dev->nfc_digital_dev);
1554         nfc_digital_free_device(dev->nfc_digital_dev);
1555 
1556         usb_kill_urb(dev->in_urb);
1557         usb_kill_urb(dev->out_urb);
1558 
1559         usb_free_urb(dev->in_urb);
1560         usb_free_urb(dev->out_urb);
1561         usb_put_dev(dev->udev);
1562 
1563         kfree(dev->cmd);
1564 
1565         nfc_info(&interface->dev, "Sony Port-100 NFC device disconnected");
1566 }
1567 
1568 static struct usb_driver port100_driver = {
1569         .name =         "port100",
1570         .probe =        port100_probe,
1571         .disconnect =   port100_disconnect,
1572         .id_table =     port100_table,
1573 };
1574 
1575 module_usb_driver(port100_driver);
1576 
1577 MODULE_DESCRIPTION("NFC Port-100 series usb driver ver " VERSION);
1578 MODULE_VERSION(VERSION);
1579 MODULE_LICENSE("GPL");
1580 

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