Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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_INITIAL_GUARD_TIME,     18 },
347                 { PORT100_IN_PROT_ADD_CRC,                 1 },
348                 { PORT100_IN_PROT_CHECK_CRC,               1 },
349                 { PORT100_IN_PROT_MULTI_CARD,              0 },
350                 { PORT100_IN_PROT_ADD_PARITY,              0 },
351                 { PORT100_IN_PROT_CHECK_PARITY,            0 },
352                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
353                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
354                 { PORT100_IN_PROT_CRYPTO1,                 0 },
355                 { PORT100_IN_PROT_ADD_SOF,                 0 },
356                 { PORT100_IN_PROT_CHECK_SOF,               0 },
357                 { PORT100_IN_PROT_ADD_EOF,                 0 },
358                 { PORT100_IN_PROT_CHECK_EOF,               0 },
359                 { PORT100_IN_PROT_DEAF_TIME,               4 },
360                 { PORT100_IN_PROT_CRM,                     0 },
361                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
362                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
363                 { PORT100_IN_PROT_RFCA,                    0 },
364                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
365                 { PORT100_IN_PROT_END,                     0 },
366         },
367         [NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
368                 { PORT100_IN_PROT_END, 0 },
369         },
370         [NFC_DIGITAL_FRAMING_NFCB] = {
371                 { PORT100_IN_PROT_INITIAL_GUARD_TIME,     20 },
372                 { PORT100_IN_PROT_ADD_CRC,                 1 },
373                 { PORT100_IN_PROT_CHECK_CRC,               1 },
374                 { PORT100_IN_PROT_MULTI_CARD,              0 },
375                 { PORT100_IN_PROT_ADD_PARITY,              0 },
376                 { PORT100_IN_PROT_CHECK_PARITY,            0 },
377                 { PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
378                 { PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
379                 { PORT100_IN_PROT_CRYPTO1,                 0 },
380                 { PORT100_IN_PROT_ADD_SOF,                 1 },
381                 { PORT100_IN_PROT_CHECK_SOF,               1 },
382                 { PORT100_IN_PROT_ADD_EOF,                 1 },
383                 { PORT100_IN_PROT_CHECK_EOF,               1 },
384                 { PORT100_IN_PROT_DEAF_TIME,               4 },
385                 { PORT100_IN_PROT_CRM,                     0 },
386                 { PORT100_IN_PROT_CRM_MIN_LEN,             0 },
387                 { PORT100_IN_PROT_T1_TAG_FRAME,            0 },
388                 { PORT100_IN_PROT_RFCA,                    0 },
389                 { PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
390                 { PORT100_IN_PROT_END,                     0 },
391         },
392         [NFC_DIGITAL_FRAMING_NFCB_T4T] = {
393                 /* nfc_digital_framing_nfcb */
394                 { PORT100_IN_PROT_END,                     0 },
395         },
396         /* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
397         [NFC_DIGITAL_FRAMING_LAST] = {
398                 { PORT100_IN_PROT_END, 0 },
399         },
400 };
401 
402 static struct port100_protocol
403 tg_protocols[][PORT100_TG_MAX_NUM_PROTOCOLS + 1] = {
404         [NFC_DIGITAL_FRAMING_NFCA_SHORT] = {
405                 { PORT100_TG_PROT_END, 0 },
406         },
407         [NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {
408                 { PORT100_TG_PROT_END, 0 },
409         },
410         [NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {
411                 { PORT100_TG_PROT_END, 0 },
412         },
413         [NFC_DIGITAL_FRAMING_NFCA_T1T] = {
414                 { PORT100_TG_PROT_END, 0 },
415         },
416         [NFC_DIGITAL_FRAMING_NFCA_T2T] = {
417                 { PORT100_TG_PROT_END, 0 },
418         },
419         [NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {
420                 { PORT100_TG_PROT_TU,     1 },
421                 { PORT100_TG_PROT_RF_OFF, 0 },
422                 { PORT100_TG_PROT_CRM,    7 },
423                 { PORT100_TG_PROT_END,    0 },
424         },
425         [NFC_DIGITAL_FRAMING_NFCF] = {
426                 { PORT100_TG_PROT_END, 0 },
427         },
428         [NFC_DIGITAL_FRAMING_NFCF_T3T] = {
429                 { PORT100_TG_PROT_END, 0 },
430         },
431         [NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
432                 { PORT100_TG_PROT_TU,     1 },
433                 { PORT100_TG_PROT_RF_OFF, 0 },
434                 { PORT100_TG_PROT_CRM,    7 },
435                 { PORT100_TG_PROT_END,    0 },
436         },
437         [NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
438                 { PORT100_TG_PROT_RF_OFF, 1 },
439                 { PORT100_TG_PROT_END,    0 },
440         },
441         /* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
442         [NFC_DIGITAL_FRAMING_LAST] = {
443                 { PORT100_TG_PROT_END,    0 },
444         },
445 };
446 
447 struct port100 {
448         struct nfc_digital_dev *nfc_digital_dev;
449 
450         int skb_headroom;
451         int skb_tailroom;
452 
453         struct usb_device *udev;
454         struct usb_interface *interface;
455 
456         struct urb *out_urb;
457         struct urb *in_urb;
458 
459         /* This mutex protects the out_urb and avoids to submit a new command
460          * through port100_send_frame_async() while the previous one is being
461          * canceled through port100_abort_cmd().
462          */
463         struct mutex out_urb_lock;
464 
465         struct work_struct cmd_complete_work;
466 
467         u8 cmd_type;
468 
469         /* The digital stack serializes commands to be sent. There is no need
470          * for any queuing/locking mechanism at driver level.
471          */
472         struct port100_cmd *cmd;
473 
474         bool cmd_cancel;
475         struct completion cmd_cancel_done;
476 };
477 
478 struct port100_cmd {
479         u8 code;
480         int status;
481         struct sk_buff *req;
482         struct sk_buff *resp;
483         int resp_len;
484         port100_send_async_complete_t  complete_cb;
485         void *complete_cb_context;
486 };
487 
488 struct port100_frame {
489         u8 preamble;
490         __be16 start_frame;
491         __be16 extended_frame;
492         __le16 datalen;
493         u8 datalen_checksum;
494         u8 data[];
495 } __packed;
496 
497 struct port100_ack_frame {
498         u8 preamble;
499         __be16 start_frame;
500         __be16 ack_frame;
501         u8 postambule;
502 } __packed;
503 
504 struct port100_cb_arg {
505         nfc_digital_cmd_complete_t complete_cb;
506         void *complete_arg;
507         u8 mdaa;
508 };
509 
510 struct port100_tg_comm_rf_cmd {
511         __le16 guard_time;
512         __le16 send_timeout;
513         u8 mdaa;
514         u8 nfca_param[6];
515         u8 nfcf_param[18];
516         u8 mf_halted;
517         u8 arae_flag;
518         __le16 recv_timeout;
519         u8 data[];
520 } __packed;
521 
522 struct port100_tg_comm_rf_res {
523         u8 comm_type;
524         u8 ar_status;
525         u8 target_activated;
526         __le32 status;
527         u8 data[];
528 } __packed;
529 
530 /* The rule: value + checksum = 0 */
531 static inline u8 port100_checksum(u16 value)
532 {
533         return ~(((u8 *)&value)[0] + ((u8 *)&value)[1]) + 1;
534 }
535 
536 /* The rule: sum(data elements) + checksum = 0 */
537 static u8 port100_data_checksum(u8 *data, int datalen)
538 {
539         u8 sum = 0;
540         int i;
541 
542         for (i = 0; i < datalen; i++)
543                 sum += data[i];
544 
545         return port100_checksum(sum);
546 }
547 
548 static void port100_tx_frame_init(void *_frame, u8 cmd_code)
549 {
550         struct port100_frame *frame = _frame;
551 
552         frame->preamble = 0;
553         frame->start_frame = cpu_to_be16(PORT100_FRAME_SOF);
554         frame->extended_frame = cpu_to_be16(PORT100_FRAME_EXT);
555         PORT100_FRAME_DIRECTION(frame) = PORT100_FRAME_DIR_OUT;
556         PORT100_FRAME_CMD(frame) = cmd_code;
557         frame->datalen = cpu_to_le16(2);
558 }
559 
560 static void port100_tx_frame_finish(void *_frame)
561 {
562         struct port100_frame *frame = _frame;
563 
564         frame->datalen_checksum = port100_checksum(le16_to_cpu(frame->datalen));
565 
566         PORT100_FRAME_CHECKSUM(frame) =
567                 port100_data_checksum(frame->data, le16_to_cpu(frame->datalen));
568 
569         PORT100_FRAME_POSTAMBLE(frame) = 0;
570 }
571 
572 static void port100_tx_update_payload_len(void *_frame, int len)
573 {
574         struct port100_frame *frame = _frame;
575 
576         frame->datalen = cpu_to_le16(le16_to_cpu(frame->datalen) + len);
577 }
578 
579 static bool port100_rx_frame_is_valid(void *_frame)
580 {
581         u8 checksum;
582         struct port100_frame *frame = _frame;
583 
584         if (frame->start_frame != cpu_to_be16(PORT100_FRAME_SOF) ||
585             frame->extended_frame != cpu_to_be16(PORT100_FRAME_EXT))
586                 return false;
587 
588         checksum = port100_checksum(le16_to_cpu(frame->datalen));
589         if (checksum != frame->datalen_checksum)
590                 return false;
591 
592         checksum = port100_data_checksum(frame->data,
593                                          le16_to_cpu(frame->datalen));
594         if (checksum != PORT100_FRAME_CHECKSUM(frame))
595                 return false;
596 
597         return true;
598 }
599 
600 static bool port100_rx_frame_is_ack(struct port100_ack_frame *frame)
601 {
602         return (frame->start_frame == cpu_to_be16(PORT100_FRAME_SOF) &&
603                 frame->ack_frame == cpu_to_be16(PORT100_FRAME_ACK));
604 }
605 
606 static inline int port100_rx_frame_size(void *frame)
607 {
608         struct port100_frame *f = frame;
609 
610         return sizeof(struct port100_frame) + le16_to_cpu(f->datalen) +
611                PORT100_FRAME_TAIL_LEN;
612 }
613 
614 static bool port100_rx_frame_is_cmd_response(struct port100 *dev, void *frame)
615 {
616         struct port100_frame *f = frame;
617 
618         return (PORT100_FRAME_CMD(f) == PORT100_CMD_RESPONSE(dev->cmd->code));
619 }
620 
621 static void port100_recv_response(struct urb *urb)
622 {
623         struct port100 *dev = urb->context;
624         struct port100_cmd *cmd = dev->cmd;
625         u8 *in_frame;
626 
627         cmd->status = urb->status;
628 
629         switch (urb->status) {
630         case 0:
631                 break; /* success */
632         case -ECONNRESET:
633         case -ENOENT:
634                 nfc_err(&dev->interface->dev,
635                         "The urb has been canceled (status %d)\n", urb->status);
636                 goto sched_wq;
637         case -ESHUTDOWN:
638         default:
639                 nfc_err(&dev->interface->dev, "Urb failure (status %d)\n",
640                         urb->status);
641                 goto sched_wq;
642         }
643 
644         in_frame = dev->in_urb->transfer_buffer;
645 
646         if (!port100_rx_frame_is_valid(in_frame)) {
647                 nfc_err(&dev->interface->dev, "Received an invalid frame\n");
648                 cmd->status = -EIO;
649                 goto sched_wq;
650         }
651 
652         print_hex_dump_debug("PORT100 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
653                              port100_rx_frame_size(in_frame), false);
654 
655         if (!port100_rx_frame_is_cmd_response(dev, in_frame)) {
656                 nfc_err(&dev->interface->dev,
657                         "It's not the response to the last command\n");
658                 cmd->status = -EIO;
659                 goto sched_wq;
660         }
661 
662 sched_wq:
663         schedule_work(&dev->cmd_complete_work);
664 }
665 
666 static int port100_submit_urb_for_response(struct port100 *dev, gfp_t flags)
667 {
668         dev->in_urb->complete = port100_recv_response;
669 
670         return usb_submit_urb(dev->in_urb, flags);
671 }
672 
673 static void port100_recv_ack(struct urb *urb)
674 {
675         struct port100 *dev = urb->context;
676         struct port100_cmd *cmd = dev->cmd;
677         struct port100_ack_frame *in_frame;
678         int rc;
679 
680         cmd->status = urb->status;
681 
682         switch (urb->status) {
683         case 0:
684                 break; /* success */
685         case -ECONNRESET:
686         case -ENOENT:
687                 nfc_err(&dev->interface->dev,
688                         "The urb has been stopped (status %d)\n", urb->status);
689                 goto sched_wq;
690         case -ESHUTDOWN:
691         default:
692                 nfc_err(&dev->interface->dev, "Urb failure (status %d)\n",
693                         urb->status);
694                 goto sched_wq;
695         }
696 
697         in_frame = dev->in_urb->transfer_buffer;
698 
699         if (!port100_rx_frame_is_ack(in_frame)) {
700                 nfc_err(&dev->interface->dev, "Received an invalid ack\n");
701                 cmd->status = -EIO;
702                 goto sched_wq;
703         }
704 
705         rc = port100_submit_urb_for_response(dev, GFP_ATOMIC);
706         if (rc) {
707                 nfc_err(&dev->interface->dev,
708                         "usb_submit_urb failed with result %d\n", rc);
709                 cmd->status = rc;
710                 goto sched_wq;
711         }
712 
713         return;
714 
715 sched_wq:
716         schedule_work(&dev->cmd_complete_work);
717 }
718 
719 static int port100_submit_urb_for_ack(struct port100 *dev, gfp_t flags)
720 {
721         dev->in_urb->complete = port100_recv_ack;
722 
723         return usb_submit_urb(dev->in_urb, flags);
724 }
725 
726 static int port100_send_ack(struct port100 *dev)
727 {
728         int rc;
729 
730         mutex_lock(&dev->out_urb_lock);
731 
732         init_completion(&dev->cmd_cancel_done);
733 
734         usb_kill_urb(dev->out_urb);
735 
736         dev->out_urb->transfer_buffer = ack_frame;
737         dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
738         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
739 
740         /* Set the cmd_cancel flag only if the URB has been successfully
741          * submitted. It will be reset by the out URB completion callback
742          * port100_send_complete().
743          */
744         dev->cmd_cancel = !rc;
745 
746         mutex_unlock(&dev->out_urb_lock);
747 
748         if (!rc)
749                 wait_for_completion(&dev->cmd_cancel_done);
750 
751         return rc;
752 }
753 
754 static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
755                                     struct sk_buff *in, int in_len)
756 {
757         int rc;
758 
759         mutex_lock(&dev->out_urb_lock);
760 
761         /* A command cancel frame as been sent through dev->out_urb. Don't try
762          * to submit a new one.
763          */
764         if (dev->cmd_cancel) {
765                 rc = -EAGAIN;
766                 goto exit;
767         }
768 
769         dev->out_urb->transfer_buffer = out->data;
770         dev->out_urb->transfer_buffer_length = out->len;
771 
772         dev->in_urb->transfer_buffer = in->data;
773         dev->in_urb->transfer_buffer_length = in_len;
774 
775         print_hex_dump_debug("PORT100 TX: ", DUMP_PREFIX_NONE, 16, 1,
776                              out->data, out->len, false);
777 
778         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
779         if (rc)
780                 goto exit;
781 
782         rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
783         if (rc)
784                 usb_unlink_urb(dev->out_urb);
785 
786 exit:
787         mutex_unlock(&dev->out_urb_lock);
788 
789         return rc;
790 }
791 
792 static void port100_build_cmd_frame(struct port100 *dev, u8 cmd_code,
793                                     struct sk_buff *skb)
794 {
795         /* payload is already there, just update datalen */
796         int payload_len = skb->len;
797 
798         skb_push(skb, PORT100_FRAME_HEADER_LEN);
799         skb_put(skb, PORT100_FRAME_TAIL_LEN);
800 
801         port100_tx_frame_init(skb->data, cmd_code);
802         port100_tx_update_payload_len(skb->data, payload_len);
803         port100_tx_frame_finish(skb->data);
804 }
805 
806 static void port100_send_async_complete(struct port100 *dev)
807 {
808         struct port100_cmd *cmd = dev->cmd;
809         int status = cmd->status;
810 
811         struct sk_buff *req = cmd->req;
812         struct sk_buff *resp = cmd->resp;
813 
814         dev_kfree_skb(req);
815 
816         dev->cmd = NULL;
817 
818         if (status < 0) {
819                 cmd->complete_cb(dev, cmd->complete_cb_context,
820                                  ERR_PTR(status));
821                 dev_kfree_skb(resp);
822                 goto done;
823         }
824 
825         skb_put(resp, port100_rx_frame_size(resp->data));
826         skb_pull(resp, PORT100_FRAME_HEADER_LEN);
827         skb_trim(resp, resp->len - PORT100_FRAME_TAIL_LEN);
828 
829         cmd->complete_cb(dev, cmd->complete_cb_context, resp);
830 
831 done:
832         kfree(cmd);
833 }
834 
835 static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
836                                 struct sk_buff *req,
837                                 port100_send_async_complete_t complete_cb,
838                                 void *complete_cb_context)
839 {
840         struct port100_cmd *cmd;
841         struct sk_buff *resp;
842         int rc;
843         int  resp_len = PORT100_FRAME_HEADER_LEN +
844                         PORT100_FRAME_MAX_PAYLOAD_LEN +
845                         PORT100_FRAME_TAIL_LEN;
846 
847         if (dev->cmd) {
848                 nfc_err(&dev->interface->dev,
849                         "A command is still in process\n");
850                 return -EBUSY;
851         }
852 
853         resp = alloc_skb(resp_len, GFP_KERNEL);
854         if (!resp)
855                 return -ENOMEM;
856 
857         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
858         if (!cmd) {
859                 dev_kfree_skb(resp);
860                 return -ENOMEM;
861         }
862 
863         cmd->code = cmd_code;
864         cmd->req = req;
865         cmd->resp = resp;
866         cmd->resp_len = resp_len;
867         cmd->complete_cb = complete_cb;
868         cmd->complete_cb_context = complete_cb_context;
869 
870         port100_build_cmd_frame(dev, cmd_code, req);
871 
872         dev->cmd = cmd;
873 
874         rc = port100_send_frame_async(dev, req, resp, resp_len);
875         if (rc) {
876                 kfree(cmd);
877                 dev_kfree_skb(resp);
878                 dev->cmd = NULL;
879         }
880 
881         return rc;
882 }
883 
884 struct port100_sync_cmd_response {
885         struct sk_buff *resp;
886         struct completion done;
887 };
888 
889 static void port100_wq_cmd_complete(struct work_struct *work)
890 {
891         struct port100 *dev = container_of(work, struct port100,
892                                            cmd_complete_work);
893 
894         port100_send_async_complete(dev);
895 }
896 
897 static void port100_send_sync_complete(struct port100 *dev, void *_arg,
898                                       struct sk_buff *resp)
899 {
900         struct port100_sync_cmd_response *arg = _arg;
901 
902         arg->resp = resp;
903         complete(&arg->done);
904 }
905 
906 static struct sk_buff *port100_send_cmd_sync(struct port100 *dev, u8 cmd_code,
907                                              struct sk_buff *req)
908 {
909         int rc;
910         struct port100_sync_cmd_response arg;
911 
912         init_completion(&arg.done);
913 
914         rc = port100_send_cmd_async(dev, cmd_code, req,
915                                     port100_send_sync_complete, &arg);
916         if (rc) {
917                 dev_kfree_skb(req);
918                 return ERR_PTR(rc);
919         }
920 
921         wait_for_completion(&arg.done);
922 
923         return arg.resp;
924 }
925 
926 static void port100_send_complete(struct urb *urb)
927 {
928         struct port100 *dev = urb->context;
929 
930         if (dev->cmd_cancel) {
931                 dev->cmd_cancel = false;
932                 complete(&dev->cmd_cancel_done);
933         }
934 
935         switch (urb->status) {
936         case 0:
937                 break; /* success */
938         case -ECONNRESET:
939         case -ENOENT:
940                 nfc_err(&dev->interface->dev,
941                         "The urb has been stopped (status %d)\n", urb->status);
942                 break;
943         case -ESHUTDOWN:
944         default:
945                 nfc_err(&dev->interface->dev, "Urb failure (status %d)\n",
946                         urb->status);
947         }
948 }
949 
950 static void port100_abort_cmd(struct nfc_digital_dev *ddev)
951 {
952         struct port100 *dev = nfc_digital_get_drvdata(ddev);
953 
954         /* An ack will cancel the last issued command */
955         port100_send_ack(dev);
956 
957         /* cancel the urb request */
958         usb_kill_urb(dev->in_urb);
959 }
960 
961 static struct sk_buff *port100_alloc_skb(struct port100 *dev, unsigned int size)
962 {
963         struct sk_buff *skb;
964 
965         skb = alloc_skb(dev->skb_headroom + dev->skb_tailroom + size,
966                         GFP_KERNEL);
967         if (skb)
968                 skb_reserve(skb, dev->skb_headroom);
969 
970         return skb;
971 }
972 
973 static int port100_set_command_type(struct port100 *dev, u8 command_type)
974 {
975         struct sk_buff *skb;
976         struct sk_buff *resp;
977         int rc;
978 
979         skb = port100_alloc_skb(dev, 1);
980         if (!skb)
981                 return -ENOMEM;
982 
983         *skb_put(skb, sizeof(u8)) = command_type;
984 
985         resp = port100_send_cmd_sync(dev, PORT100_CMD_SET_COMMAND_TYPE, skb);
986         if (IS_ERR(resp))
987                 return PTR_ERR(resp);
988 
989         rc = resp->data[0];
990 
991         dev_kfree_skb(resp);
992 
993         return rc;
994 }
995 
996 static u64 port100_get_command_type_mask(struct port100 *dev)
997 {
998         struct sk_buff *skb;
999         struct sk_buff *resp;
1000         u64 mask;
1001 
1002         skb = port100_alloc_skb(dev, 0);
1003         if (!skb)
1004                 return -ENOMEM;
1005 
1006         resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_COMMAND_TYPE, skb);
1007         if (IS_ERR(resp))
1008                 return PTR_ERR(resp);
1009 
1010         if (resp->len < 8)
1011                 mask = 0;
1012         else
1013                 mask = be64_to_cpu(*(__be64 *)resp->data);
1014 
1015         dev_kfree_skb(resp);
1016 
1017         return mask;
1018 }
1019 
1020 static u16 port100_get_firmware_version(struct port100 *dev)
1021 {
1022         struct sk_buff *skb;
1023         struct sk_buff *resp;
1024         u16 fw_ver;
1025 
1026         skb = port100_alloc_skb(dev, 0);
1027         if (!skb)
1028                 return 0;
1029 
1030         resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_FIRMWARE_VERSION,
1031                                      skb);
1032         if (IS_ERR(resp))
1033                 return 0;
1034 
1035         fw_ver = le16_to_cpu(*(__le16 *)resp->data);
1036 
1037         dev_kfree_skb(resp);
1038 
1039         return fw_ver;
1040 }
1041 
1042 static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
1043 {
1044         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1045         struct sk_buff *skb, *resp;
1046 
1047         skb = port100_alloc_skb(dev, 1);
1048         if (!skb)
1049                 return -ENOMEM;
1050 
1051         *skb_put(skb, 1) = on ? 1 : 0;
1052 
1053         /* Cancel the last command if the device is being switched off */
1054         if (!on)
1055                 port100_abort_cmd(ddev);
1056 
1057         resp = port100_send_cmd_sync(dev, PORT100_CMD_SWITCH_RF, skb);
1058 
1059         if (IS_ERR(resp))
1060                 return PTR_ERR(resp);
1061 
1062         dev_kfree_skb(resp);
1063 
1064         return 0;
1065 }
1066 
1067 static int port100_in_set_rf(struct nfc_digital_dev *ddev, u8 rf)
1068 {
1069         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1070         struct sk_buff *skb;
1071         struct sk_buff *resp;
1072         int rc;
1073 
1074         if (rf >= NFC_DIGITAL_RF_TECH_LAST)
1075                 return -EINVAL;
1076 
1077         skb = port100_alloc_skb(dev, sizeof(struct port100_in_rf_setting));
1078         if (!skb)
1079                 return -ENOMEM;
1080 
1081         memcpy(skb_put(skb, sizeof(struct port100_in_rf_setting)),
1082                &in_rf_settings[rf],
1083                sizeof(struct port100_in_rf_setting));
1084 
1085         resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_RF, skb);
1086 
1087         if (IS_ERR(resp))
1088                 return PTR_ERR(resp);
1089 
1090         rc = resp->data[0];
1091 
1092         dev_kfree_skb(resp);
1093 
1094         return rc;
1095 }
1096 
1097 static int port100_in_set_framing(struct nfc_digital_dev *ddev, int param)
1098 {
1099         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1100         struct port100_protocol *protocols;
1101         struct sk_buff *skb;
1102         struct sk_buff *resp;
1103         int num_protocols;
1104         size_t size;
1105         int rc;
1106 
1107         if (param >= NFC_DIGITAL_FRAMING_LAST)
1108                 return -EINVAL;
1109 
1110         protocols = in_protocols[param];
1111 
1112         num_protocols = 0;
1113         while (protocols[num_protocols].number != PORT100_IN_PROT_END)
1114                 num_protocols++;
1115 
1116         if (!num_protocols)
1117                 return 0;
1118 
1119         size = sizeof(struct port100_protocol) * num_protocols;
1120 
1121         skb = port100_alloc_skb(dev, size);
1122         if (!skb)
1123                 return -ENOMEM;
1124 
1125         memcpy(skb_put(skb, size), protocols, size);
1126 
1127         resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_PROTOCOL, skb);
1128 
1129         if (IS_ERR(resp))
1130                 return PTR_ERR(resp);
1131 
1132         rc = resp->data[0];
1133 
1134         dev_kfree_skb(resp);
1135 
1136         return rc;
1137 }
1138 
1139 static int port100_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1140                                    int param)
1141 {
1142         if (type == NFC_DIGITAL_CONFIG_RF_TECH)
1143                 return port100_in_set_rf(ddev, param);
1144 
1145         if (type == NFC_DIGITAL_CONFIG_FRAMING)
1146                 return port100_in_set_framing(ddev, param);
1147 
1148         return -EINVAL;
1149 }
1150 
1151 static void port100_in_comm_rf_complete(struct port100 *dev, void *arg,
1152                                        struct sk_buff *resp)
1153 {
1154         struct port100_cb_arg *cb_arg = arg;
1155         nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
1156         u32 status;
1157         int rc;
1158 
1159         if (IS_ERR(resp)) {
1160                 rc =  PTR_ERR(resp);
1161                 goto exit;
1162         }
1163 
1164         if (resp->len < 4) {
1165                 nfc_err(&dev->interface->dev,
1166                         "Invalid packet length received\n");
1167                 rc = -EIO;
1168                 goto error;
1169         }
1170 
1171         status = le32_to_cpu(*(__le32 *)resp->data);
1172 
1173         skb_pull(resp, sizeof(u32));
1174 
1175         if (status == PORT100_CMD_STATUS_TIMEOUT) {
1176                 rc = -ETIMEDOUT;
1177                 goto error;
1178         }
1179 
1180         if (status != PORT100_CMD_STATUS_OK) {
1181                 nfc_err(&dev->interface->dev,
1182                         "in_comm_rf failed with status 0x%08x\n", status);
1183                 rc = -EIO;
1184                 goto error;
1185         }
1186 
1187         /* Remove collision bits byte */
1188         skb_pull(resp, 1);
1189 
1190         goto exit;
1191 
1192 error:
1193         kfree_skb(resp);
1194         resp = ERR_PTR(rc);
1195 
1196 exit:
1197         cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
1198 
1199         kfree(cb_arg);
1200 }
1201 
1202 static int port100_in_send_cmd(struct nfc_digital_dev *ddev,
1203                                struct sk_buff *skb, u16 _timeout,
1204                                nfc_digital_cmd_complete_t cb, void *arg)
1205 {
1206         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1207         struct port100_cb_arg *cb_arg;
1208         __le16 timeout;
1209 
1210         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1211         if (!cb_arg)
1212                 return -ENOMEM;
1213 
1214         cb_arg->complete_cb = cb;
1215         cb_arg->complete_arg = arg;
1216 
1217         timeout = cpu_to_le16(_timeout * 10);
1218 
1219         memcpy(skb_push(skb, sizeof(__le16)), &timeout, sizeof(__le16));
1220 
1221         return port100_send_cmd_async(dev, PORT100_CMD_IN_COMM_RF, skb,
1222                                       port100_in_comm_rf_complete, cb_arg);
1223 }
1224 
1225 static int port100_tg_set_rf(struct nfc_digital_dev *ddev, u8 rf)
1226 {
1227         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1228         struct sk_buff *skb;
1229         struct sk_buff *resp;
1230         int rc;
1231 
1232         if (rf >= NFC_DIGITAL_RF_TECH_LAST)
1233                 return -EINVAL;
1234 
1235         skb = port100_alloc_skb(dev, sizeof(struct port100_tg_rf_setting));
1236         if (!skb)
1237                 return -ENOMEM;
1238 
1239         memcpy(skb_put(skb, sizeof(struct port100_tg_rf_setting)),
1240                &tg_rf_settings[rf],
1241                sizeof(struct port100_tg_rf_setting));
1242 
1243         resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_RF, skb);
1244 
1245         if (IS_ERR(resp))
1246                 return PTR_ERR(resp);
1247 
1248         rc = resp->data[0];
1249 
1250         dev_kfree_skb(resp);
1251 
1252         return rc;
1253 }
1254 
1255 static int port100_tg_set_framing(struct nfc_digital_dev *ddev, int param)
1256 {
1257         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1258         struct port100_protocol *protocols;
1259         struct sk_buff *skb;
1260         struct sk_buff *resp;
1261         int rc;
1262         int num_protocols;
1263         size_t size;
1264 
1265         if (param >= NFC_DIGITAL_FRAMING_LAST)
1266                 return -EINVAL;
1267 
1268         protocols = tg_protocols[param];
1269 
1270         num_protocols = 0;
1271         while (protocols[num_protocols].number != PORT100_TG_PROT_END)
1272                 num_protocols++;
1273 
1274         if (!num_protocols)
1275                 return 0;
1276 
1277         size = sizeof(struct port100_protocol) * num_protocols;
1278 
1279         skb = port100_alloc_skb(dev, size);
1280         if (!skb)
1281                 return -ENOMEM;
1282 
1283         memcpy(skb_put(skb, size), protocols, size);
1284 
1285         resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_PROTOCOL, skb);
1286 
1287         if (IS_ERR(resp))
1288                 return PTR_ERR(resp);
1289 
1290         rc = resp->data[0];
1291 
1292         dev_kfree_skb(resp);
1293 
1294         return rc;
1295 }
1296 
1297 static int port100_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1298                                    int param)
1299 {
1300         if (type == NFC_DIGITAL_CONFIG_RF_TECH)
1301                 return port100_tg_set_rf(ddev, param);
1302 
1303         if (type == NFC_DIGITAL_CONFIG_FRAMING)
1304                 return port100_tg_set_framing(ddev, param);
1305 
1306         return -EINVAL;
1307 }
1308 
1309 static bool port100_tg_target_activated(struct port100 *dev, u8 tgt_activated)
1310 {
1311         u8 mask;
1312 
1313         switch (dev->cmd_type) {
1314         case PORT100_CMD_TYPE_0:
1315                 mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK;
1316                 break;
1317         case PORT100_CMD_TYPE_1:
1318                 mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK |
1319                        PORT100_MDAA_TGT_WAS_ACTIVATED_MASK;
1320                 break;
1321         default:
1322                 nfc_err(&dev->interface->dev, "Unknown command type\n");
1323                 return false;
1324         }
1325 
1326         return ((tgt_activated & mask) == mask);
1327 }
1328 
1329 static void port100_tg_comm_rf_complete(struct port100 *dev, void *arg,
1330                                         struct sk_buff *resp)
1331 {
1332         u32 status;
1333         struct port100_cb_arg *cb_arg = arg;
1334         nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
1335         struct port100_tg_comm_rf_res *hdr;
1336 
1337         if (IS_ERR(resp))
1338                 goto exit;
1339 
1340         hdr = (struct port100_tg_comm_rf_res *)resp->data;
1341 
1342         status = le32_to_cpu(hdr->status);
1343 
1344         if (cb_arg->mdaa &&
1345             !port100_tg_target_activated(dev, hdr->target_activated)) {
1346                 kfree_skb(resp);
1347                 resp = ERR_PTR(-ETIMEDOUT);
1348 
1349                 goto exit;
1350         }
1351 
1352         skb_pull(resp, sizeof(struct port100_tg_comm_rf_res));
1353 
1354         if (status != PORT100_CMD_STATUS_OK) {
1355                 kfree_skb(resp);
1356 
1357                 if (status == PORT100_CMD_STATUS_TIMEOUT)
1358                         resp = ERR_PTR(-ETIMEDOUT);
1359                 else
1360                         resp = ERR_PTR(-EIO);
1361         }
1362 
1363 exit:
1364         cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
1365 
1366         kfree(cb_arg);
1367 }
1368 
1369 static int port100_tg_send_cmd(struct nfc_digital_dev *ddev,
1370                                struct sk_buff *skb, u16 timeout,
1371                                nfc_digital_cmd_complete_t cb, void *arg)
1372 {
1373         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1374         struct port100_tg_comm_rf_cmd *hdr;
1375         struct port100_cb_arg *cb_arg;
1376 
1377         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1378         if (!cb_arg)
1379                 return -ENOMEM;
1380 
1381         cb_arg->complete_cb = cb;
1382         cb_arg->complete_arg = arg;
1383 
1384         skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
1385 
1386         hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
1387 
1388         memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
1389         hdr->guard_time = cpu_to_le16(500);
1390         hdr->send_timeout = cpu_to_le16(0xFFFF);
1391         hdr->recv_timeout = cpu_to_le16(timeout);
1392 
1393         return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
1394                                       port100_tg_comm_rf_complete, cb_arg);
1395 }
1396 
1397 static int port100_listen_mdaa(struct nfc_digital_dev *ddev,
1398                                struct digital_tg_mdaa_params *params,
1399                                u16 timeout,
1400                                nfc_digital_cmd_complete_t cb, void *arg)
1401 {
1402         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1403         struct port100_tg_comm_rf_cmd *hdr;
1404         struct port100_cb_arg *cb_arg;
1405         struct sk_buff *skb;
1406         int rc;
1407 
1408         rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1409                                      NFC_DIGITAL_RF_TECH_106A);
1410         if (rc)
1411                 return rc;
1412 
1413         rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1414                                      NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1415         if (rc)
1416                 return rc;
1417 
1418         cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
1419         if (!cb_arg)
1420                 return -ENOMEM;
1421 
1422         cb_arg->complete_cb = cb;
1423         cb_arg->complete_arg = arg;
1424         cb_arg->mdaa = 1;
1425 
1426         skb = port100_alloc_skb(dev, 0);
1427         if (!skb) {
1428                 kfree(cb_arg);
1429                 return -ENOMEM;
1430         }
1431 
1432         skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
1433         hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
1434 
1435         memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
1436 
1437         hdr->guard_time = 0;
1438         hdr->send_timeout = cpu_to_le16(0xFFFF);
1439         hdr->mdaa = 1;
1440         hdr->nfca_param[0] = (params->sens_res >> 8) & 0xFF;
1441         hdr->nfca_param[1] = params->sens_res & 0xFF;
1442         memcpy(hdr->nfca_param + 2, params->nfcid1, 3);
1443         hdr->nfca_param[5] = params->sel_res;
1444         memcpy(hdr->nfcf_param, params->nfcid2, 8);
1445         hdr->nfcf_param[16] = (params->sc >> 8) & 0xFF;
1446         hdr->nfcf_param[17] = params->sc & 0xFF;
1447         hdr->recv_timeout = cpu_to_le16(timeout);
1448 
1449         return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
1450                                       port100_tg_comm_rf_complete, cb_arg);
1451 }
1452 
1453 static int port100_listen(struct nfc_digital_dev *ddev, u16 timeout,
1454                           nfc_digital_cmd_complete_t cb, void *arg)
1455 {
1456         struct port100 *dev = nfc_digital_get_drvdata(ddev);
1457         struct sk_buff *skb;
1458 
1459         skb = port100_alloc_skb(dev, 0);
1460         if (!skb)
1461                 return -ENOMEM;
1462 
1463         return port100_tg_send_cmd(ddev, skb, timeout, cb, arg);
1464 }
1465 
1466 static struct nfc_digital_ops port100_digital_ops = {
1467         .in_configure_hw = port100_in_configure_hw,
1468         .in_send_cmd = port100_in_send_cmd,
1469 
1470         .tg_listen_mdaa = port100_listen_mdaa,
1471         .tg_listen = port100_listen,
1472         .tg_configure_hw = port100_tg_configure_hw,
1473         .tg_send_cmd = port100_tg_send_cmd,
1474 
1475         .switch_rf = port100_switch_rf,
1476         .abort_cmd = port100_abort_cmd,
1477 };
1478 
1479 static const struct usb_device_id port100_table[] = {
1480         { USB_DEVICE(SONY_VENDOR_ID, RCS380_PRODUCT_ID), },
1481         { }
1482 };
1483 MODULE_DEVICE_TABLE(usb, port100_table);
1484 
1485 static int port100_probe(struct usb_interface *interface,
1486                          const struct usb_device_id *id)
1487 {
1488         struct port100 *dev;
1489         int rc;
1490         struct usb_host_interface *iface_desc;
1491         struct usb_endpoint_descriptor *endpoint;
1492         int in_endpoint;
1493         int out_endpoint;
1494         u16 fw_version;
1495         u64 cmd_type_mask;
1496         int i;
1497 
1498         dev = devm_kzalloc(&interface->dev, sizeof(struct port100), GFP_KERNEL);
1499         if (!dev)
1500                 return -ENOMEM;
1501 
1502         mutex_init(&dev->out_urb_lock);
1503         dev->udev = usb_get_dev(interface_to_usbdev(interface));
1504         dev->interface = interface;
1505         usb_set_intfdata(interface, dev);
1506 
1507         in_endpoint = out_endpoint = 0;
1508         iface_desc = interface->cur_altsetting;
1509         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1510                 endpoint = &iface_desc->endpoint[i].desc;
1511 
1512                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
1513                         in_endpoint = endpoint->bEndpointAddress;
1514 
1515                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
1516                         out_endpoint = endpoint->bEndpointAddress;
1517         }
1518 
1519         if (!in_endpoint || !out_endpoint) {
1520                 nfc_err(&interface->dev,
1521                         "Could not find bulk-in or bulk-out endpoint\n");
1522                 rc = -ENODEV;
1523                 goto error;
1524         }
1525 
1526         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
1527         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
1528 
1529         if (!dev->in_urb || !dev->out_urb) {
1530                 nfc_err(&interface->dev, "Could not allocate USB URBs\n");
1531                 rc = -ENOMEM;
1532                 goto error;
1533         }
1534 
1535         usb_fill_bulk_urb(dev->in_urb, dev->udev,
1536                           usb_rcvbulkpipe(dev->udev, in_endpoint),
1537                           NULL, 0, NULL, dev);
1538         usb_fill_bulk_urb(dev->out_urb, dev->udev,
1539                           usb_sndbulkpipe(dev->udev, out_endpoint),
1540                           NULL, 0, port100_send_complete, dev);
1541 
1542         dev->skb_headroom = PORT100_FRAME_HEADER_LEN +
1543                             PORT100_COMM_RF_HEAD_MAX_LEN;
1544         dev->skb_tailroom = PORT100_FRAME_TAIL_LEN;
1545 
1546         INIT_WORK(&dev->cmd_complete_work, port100_wq_cmd_complete);
1547 
1548         /* The first thing to do with the Port-100 is to set the command type
1549          * to be used. If supported we use command type 1. 0 otherwise.
1550          */
1551         cmd_type_mask = port100_get_command_type_mask(dev);
1552         if (!cmd_type_mask) {
1553                 nfc_err(&interface->dev,
1554                         "Could not get supported command types\n");
1555                 rc = -ENODEV;
1556                 goto error;
1557         }
1558 
1559         if (PORT100_CMD_TYPE_IS_SUPPORTED(cmd_type_mask, PORT100_CMD_TYPE_1))
1560                 dev->cmd_type = PORT100_CMD_TYPE_1;
1561         else
1562                 dev->cmd_type = PORT100_CMD_TYPE_0;
1563 
1564         rc = port100_set_command_type(dev, dev->cmd_type);
1565         if (rc) {
1566                 nfc_err(&interface->dev,
1567                         "The device does not support command type %u\n",
1568                         dev->cmd_type);
1569                 goto error;
1570         }
1571 
1572         fw_version = port100_get_firmware_version(dev);
1573         if (!fw_version)
1574                 nfc_err(&interface->dev,
1575                         "Could not get device firmware version\n");
1576 
1577         nfc_info(&interface->dev,
1578                  "Sony NFC Port-100 Series attached (firmware v%x.%02x)\n",
1579                  (fw_version & 0xFF00) >> 8, fw_version & 0xFF);
1580 
1581         dev->nfc_digital_dev = nfc_digital_allocate_device(&port100_digital_ops,
1582                                                            PORT100_PROTOCOLS,
1583                                                            PORT100_CAPABILITIES,
1584                                                            dev->skb_headroom,
1585                                                            dev->skb_tailroom);
1586         if (!dev->nfc_digital_dev) {
1587                 nfc_err(&interface->dev,
1588                         "Could not allocate nfc_digital_dev\n");
1589                 rc = -ENOMEM;
1590                 goto error;
1591         }
1592 
1593         nfc_digital_set_parent_dev(dev->nfc_digital_dev, &interface->dev);
1594         nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
1595 
1596         rc = nfc_digital_register_device(dev->nfc_digital_dev);
1597         if (rc) {
1598                 nfc_err(&interface->dev,
1599                         "Could not register digital device\n");
1600                 goto free_nfc_dev;
1601         }
1602 
1603         return 0;
1604 
1605 free_nfc_dev:
1606         nfc_digital_free_device(dev->nfc_digital_dev);
1607 
1608 error:
1609         usb_free_urb(dev->in_urb);
1610         usb_free_urb(dev->out_urb);
1611         usb_put_dev(dev->udev);
1612 
1613         return rc;
1614 }
1615 
1616 static void port100_disconnect(struct usb_interface *interface)
1617 {
1618         struct port100 *dev;
1619 
1620         dev = usb_get_intfdata(interface);
1621         usb_set_intfdata(interface, NULL);
1622 
1623         nfc_digital_unregister_device(dev->nfc_digital_dev);
1624         nfc_digital_free_device(dev->nfc_digital_dev);
1625 
1626         usb_kill_urb(dev->in_urb);
1627         usb_kill_urb(dev->out_urb);
1628 
1629         usb_free_urb(dev->in_urb);
1630         usb_free_urb(dev->out_urb);
1631         usb_put_dev(dev->udev);
1632 
1633         kfree(dev->cmd);
1634 
1635         nfc_info(&interface->dev, "Sony Port-100 NFC device disconnected\n");
1636 }
1637 
1638 static struct usb_driver port100_driver = {
1639         .name =         "port100",
1640         .probe =        port100_probe,
1641         .disconnect =   port100_disconnect,
1642         .id_table =     port100_table,
1643 };
1644 
1645 module_usb_driver(port100_driver);
1646 
1647 MODULE_DESCRIPTION("NFC Port-100 series usb driver ver " VERSION);
1648 MODULE_VERSION(VERSION);
1649 MODULE_LICENSE("GPL");
1650 

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