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cab47333 SS |
1 | /* |
2 | * -------------------------------------------------------------------- | |
3 | * Driver for ST NFC Transceiver ST95HF | |
4 | * -------------------------------------------------------------------- | |
5 | * Copyright (C) 2015 STMicroelectronics Pvt. Ltd. All rights reserved. | |
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 that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/err.h> | |
21 | #include <linux/gpio.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/nfc.h> | |
28 | #include <linux/of_gpio.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/of_irq.h> | |
31 | #include <linux/property.h> | |
32 | #include <linux/regulator/consumer.h> | |
33 | #include <linux/wait.h> | |
34 | #include <net/nfc/digital.h> | |
35 | #include <net/nfc/nfc.h> | |
36 | ||
37 | #include "spi.h" | |
38 | ||
39 | /* supported protocols */ | |
40 | #define ST95HF_SUPPORTED_PROT (NFC_PROTO_ISO14443_MASK | \ | |
41 | NFC_PROTO_ISO14443_B_MASK | \ | |
42 | NFC_PROTO_ISO15693_MASK) | |
43 | /* driver capabilities */ | |
44 | #define ST95HF_CAPABILITIES NFC_DIGITAL_DRV_CAPS_IN_CRC | |
45 | ||
46 | /* Command Send Interface */ | |
47 | /* ST95HF_COMMAND_SEND CMD Ids */ | |
48 | #define ECHO_CMD 0x55 | |
49 | #define WRITE_REGISTER_CMD 0x9 | |
50 | #define PROTOCOL_SELECT_CMD 0x2 | |
51 | #define SEND_RECEIVE_CMD 0x4 | |
52 | ||
53 | /* Select protocol codes */ | |
54 | #define ISO15693_PROTOCOL_CODE 0x1 | |
55 | #define ISO14443A_PROTOCOL_CODE 0x2 | |
56 | #define ISO14443B_PROTOCOL_CODE 0x3 | |
57 | ||
58 | /* | |
59 | * head room len is 3 | |
60 | * 1 byte for control byte | |
61 | * 1 byte for cmd | |
62 | * 1 byte for size | |
63 | */ | |
64 | #define ST95HF_HEADROOM_LEN 3 | |
65 | ||
66 | /* | |
67 | * tailroom is 1 for ISO14443A | |
68 | * and 0 for ISO14443B/ISO15693, | |
69 | * hence the max value 1 should be | |
70 | * taken. | |
71 | */ | |
72 | #define ST95HF_TAILROOM_LEN 1 | |
73 | ||
74 | /* Command Response interface */ | |
75 | #define MAX_RESPONSE_BUFFER_SIZE 280 | |
76 | #define ECHORESPONSE 0x55 | |
77 | #define ST95HF_ERR_MASK 0xF | |
78 | #define ST95HF_TIMEOUT_ERROR 0x87 | |
79 | #define ST95HF_NFCA_CRC_ERR_MASK 0x20 | |
80 | #define ST95HF_NFCB_CRC_ERR_MASK 0x01 | |
81 | ||
82 | /* ST95HF transmission flag values */ | |
83 | #define TRFLAG_NFCA_SHORT_FRAME 0x07 | |
84 | #define TRFLAG_NFCA_STD_FRAME 0x08 | |
85 | #define TRFLAG_NFCA_STD_FRAME_CRC 0x28 | |
86 | ||
87 | /* Misc defs */ | |
88 | #define HIGH 1 | |
89 | #define LOW 0 | |
90 | #define ISO14443A_RATS_REQ 0xE0 | |
91 | #define RATS_TB1_PRESENT_MASK 0x20 | |
92 | #define RATS_TA1_PRESENT_MASK 0x10 | |
93 | #define TB1_FWI_MASK 0xF0 | |
94 | #define WTX_REQ_FROM_TAG 0xF2 | |
95 | ||
96 | #define MAX_CMD_LEN 0x7 | |
97 | ||
98 | #define MAX_CMD_PARAMS 4 | |
99 | struct cmd { | |
100 | int cmd_len; | |
101 | unsigned char cmd_id; | |
102 | unsigned char no_cmd_params; | |
103 | unsigned char cmd_params[MAX_CMD_PARAMS]; | |
104 | enum req_type req; | |
105 | }; | |
106 | ||
107 | struct param_list { | |
108 | int param_offset; | |
109 | int new_param_val; | |
110 | }; | |
111 | ||
112 | /* | |
113 | * List of top-level cmds to be used internally by the driver. | |
114 | * All these commands are build on top of ST95HF basic commands | |
115 | * such as SEND_RECEIVE_CMD, PROTOCOL_SELECT_CMD, etc. | |
116 | * These top level cmds are used internally while implementing various ops of | |
117 | * digital layer/driver probe or extending the digital framework layer for | |
118 | * features that are not yet implemented there, for example, WTX cmd handling. | |
119 | */ | |
120 | enum st95hf_cmd_list { | |
121 | CMD_ECHO, | |
122 | CMD_ISO14443A_CONFIG, | |
123 | CMD_ISO14443A_DEMOGAIN, | |
124 | CMD_ISO14443B_DEMOGAIN, | |
125 | CMD_ISO14443A_PROTOCOL_SELECT, | |
126 | CMD_ISO14443B_PROTOCOL_SELECT, | |
127 | CMD_WTX_RESPONSE, | |
128 | CMD_FIELD_OFF, | |
129 | CMD_ISO15693_PROTOCOL_SELECT, | |
130 | }; | |
131 | ||
132 | static const struct cmd cmd_array[] = { | |
133 | [CMD_ECHO] = { | |
134 | .cmd_len = 0x2, | |
135 | .cmd_id = ECHO_CMD, | |
136 | .no_cmd_params = 0, | |
137 | .req = SYNC, | |
138 | }, | |
139 | [CMD_ISO14443A_CONFIG] = { | |
140 | .cmd_len = 0x7, | |
141 | .cmd_id = WRITE_REGISTER_CMD, | |
142 | .no_cmd_params = 0x4, | |
143 | .cmd_params = {0x3A, 0x00, 0x5A, 0x04}, | |
144 | .req = SYNC, | |
145 | }, | |
146 | [CMD_ISO14443A_DEMOGAIN] = { | |
147 | .cmd_len = 0x7, | |
148 | .cmd_id = WRITE_REGISTER_CMD, | |
149 | .no_cmd_params = 0x4, | |
150 | .cmd_params = {0x68, 0x01, 0x01, 0xDF}, | |
151 | .req = SYNC, | |
152 | }, | |
153 | [CMD_ISO14443B_DEMOGAIN] = { | |
154 | .cmd_len = 0x7, | |
155 | .cmd_id = WRITE_REGISTER_CMD, | |
156 | .no_cmd_params = 0x4, | |
157 | .cmd_params = {0x68, 0x01, 0x01, 0x51}, | |
158 | .req = SYNC, | |
159 | }, | |
160 | [CMD_ISO14443A_PROTOCOL_SELECT] = { | |
161 | .cmd_len = 0x7, | |
162 | .cmd_id = PROTOCOL_SELECT_CMD, | |
163 | .no_cmd_params = 0x4, | |
164 | .cmd_params = {ISO14443A_PROTOCOL_CODE, 0x00, 0x01, 0xA0}, | |
165 | .req = SYNC, | |
166 | }, | |
167 | [CMD_ISO14443B_PROTOCOL_SELECT] = { | |
168 | .cmd_len = 0x7, | |
169 | .cmd_id = PROTOCOL_SELECT_CMD, | |
170 | .no_cmd_params = 0x4, | |
171 | .cmd_params = {ISO14443B_PROTOCOL_CODE, 0x01, 0x03, 0xFF}, | |
172 | .req = SYNC, | |
173 | }, | |
174 | [CMD_WTX_RESPONSE] = { | |
175 | .cmd_len = 0x6, | |
176 | .cmd_id = SEND_RECEIVE_CMD, | |
177 | .no_cmd_params = 0x3, | |
178 | .cmd_params = {0xF2, 0x00, TRFLAG_NFCA_STD_FRAME_CRC}, | |
179 | .req = ASYNC, | |
180 | }, | |
181 | [CMD_FIELD_OFF] = { | |
182 | .cmd_len = 0x5, | |
183 | .cmd_id = PROTOCOL_SELECT_CMD, | |
184 | .no_cmd_params = 0x2, | |
185 | .cmd_params = {0x0, 0x0}, | |
186 | .req = SYNC, | |
187 | }, | |
188 | [CMD_ISO15693_PROTOCOL_SELECT] = { | |
189 | .cmd_len = 0x5, | |
190 | .cmd_id = PROTOCOL_SELECT_CMD, | |
191 | .no_cmd_params = 0x2, | |
192 | .cmd_params = {ISO15693_PROTOCOL_CODE, 0x0D}, | |
193 | .req = SYNC, | |
194 | }, | |
195 | }; | |
196 | ||
197 | /* st95_digital_cmd_complete_arg stores client context */ | |
198 | struct st95_digital_cmd_complete_arg { | |
199 | struct sk_buff *skb_resp; | |
200 | nfc_digital_cmd_complete_t complete_cb; | |
201 | void *cb_usrarg; | |
202 | bool rats; | |
203 | }; | |
204 | ||
205 | /* | |
206 | * structure containing ST95HF driver specific data. | |
207 | * @spicontext: structure containing information required | |
208 | * for spi communication between st95hf and host. | |
209 | * @ddev: nfc digital device object. | |
210 | * @nfcdev: nfc device object. | |
211 | * @enable_gpio: gpio used to enable st95hf transceiver. | |
212 | * @complete_cb_arg: structure to store various context information | |
213 | * that is passed from nfc requesting thread to the threaded ISR. | |
214 | * @st95hf_supply: regulator "consumer" for NFC device. | |
215 | * @sendrcv_trflag: last byte of frame send by sendrecv command | |
216 | * of st95hf. This byte contains transmission flag info. | |
217 | * @exchange_lock: semaphore used for signaling the st95hf_remove | |
218 | * function that the last outstanding async nfc request is finished. | |
219 | * @rm_lock: mutex for ensuring safe access of nfc digital object | |
220 | * from threaded ISR. Usage of this mutex avoids any race between | |
221 | * deletion of the object from st95hf_remove() and its access from | |
222 | * the threaded ISR. | |
223 | * @nfcdev_free: flag to have the state of nfc device object. | |
224 | * [alive | died] | |
225 | * @current_protocol: current nfc protocol. | |
226 | * @current_rf_tech: current rf technology. | |
227 | * @fwi: frame waiting index, received in reply of RATS according to | |
228 | * digital protocol. | |
229 | */ | |
230 | struct st95hf_context { | |
231 | struct st95hf_spi_context spicontext; | |
232 | struct nfc_digital_dev *ddev; | |
233 | struct nfc_dev *nfcdev; | |
234 | unsigned int enable_gpio; | |
235 | struct st95_digital_cmd_complete_arg complete_cb_arg; | |
236 | struct regulator *st95hf_supply; | |
237 | unsigned char sendrcv_trflag; | |
238 | struct semaphore exchange_lock; | |
239 | struct mutex rm_lock; | |
240 | bool nfcdev_free; | |
241 | u8 current_protocol; | |
242 | u8 current_rf_tech; | |
243 | int fwi; | |
244 | }; | |
245 | ||
246 | /* | |
247 | * st95hf_send_recv_cmd() is for sending commands to ST95HF | |
248 | * that are described in the cmd_array[]. It can optionally | |
249 | * receive the response if the cmd request is of type | |
250 | * SYNC. For that to happen caller must pass true to recv_res. | |
251 | * For ASYNC request, recv_res is ignored and the | |
252 | * function will never try to receive the response on behalf | |
253 | * of the caller. | |
254 | */ | |
255 | static int st95hf_send_recv_cmd(struct st95hf_context *st95context, | |
256 | enum st95hf_cmd_list cmd, | |
257 | int no_modif, | |
258 | struct param_list *list_array, | |
259 | bool recv_res) | |
260 | { | |
261 | unsigned char spi_cmd_buffer[MAX_CMD_LEN]; | |
262 | int i, ret; | |
263 | struct device *dev = &st95context->spicontext.spidev->dev; | |
264 | ||
265 | if (cmd_array[cmd].cmd_len > MAX_CMD_LEN) | |
266 | return -EINVAL; | |
267 | if (cmd_array[cmd].no_cmd_params < no_modif) | |
268 | return -EINVAL; | |
269 | if (no_modif && !list_array) | |
270 | return -EINVAL; | |
271 | ||
272 | spi_cmd_buffer[0] = ST95HF_COMMAND_SEND; | |
273 | spi_cmd_buffer[1] = cmd_array[cmd].cmd_id; | |
274 | spi_cmd_buffer[2] = cmd_array[cmd].no_cmd_params; | |
275 | ||
276 | memcpy(&spi_cmd_buffer[3], cmd_array[cmd].cmd_params, | |
277 | spi_cmd_buffer[2]); | |
278 | ||
279 | for (i = 0; i < no_modif; i++) { | |
280 | if (list_array[i].param_offset >= cmd_array[cmd].no_cmd_params) | |
281 | return -EINVAL; | |
282 | spi_cmd_buffer[3 + list_array[i].param_offset] = | |
283 | list_array[i].new_param_val; | |
284 | } | |
285 | ||
286 | ret = st95hf_spi_send(&st95context->spicontext, | |
287 | spi_cmd_buffer, | |
288 | cmd_array[cmd].cmd_len, | |
289 | cmd_array[cmd].req); | |
290 | if (ret) { | |
291 | dev_err(dev, "st95hf_spi_send failed with error %d\n", ret); | |
292 | return ret; | |
293 | } | |
294 | ||
295 | if (cmd_array[cmd].req == SYNC && recv_res) { | |
296 | unsigned char st95hf_response_arr[2]; | |
297 | ||
298 | ret = st95hf_spi_recv_response(&st95context->spicontext, | |
299 | st95hf_response_arr); | |
300 | if (ret < 0) { | |
301 | dev_err(dev, "spi error from st95hf_spi_recv_response(), err = 0x%x\n", | |
302 | ret); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | if (st95hf_response_arr[0]) { | |
307 | dev_err(dev, "st95hf error from st95hf_spi_recv_response(), err = 0x%x\n", | |
308 | st95hf_response_arr[0]); | |
309 | return -EIO; | |
310 | } | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int st95hf_echo_command(struct st95hf_context *st95context) | |
317 | { | |
318 | int result = 0; | |
319 | unsigned char echo_response; | |
320 | ||
321 | result = st95hf_send_recv_cmd(st95context, CMD_ECHO, 0, NULL, false); | |
322 | if (result) | |
323 | return result; | |
324 | ||
325 | /* If control reached here, response can be taken */ | |
326 | result = st95hf_spi_recv_echo_res(&st95context->spicontext, | |
327 | &echo_response); | |
328 | if (result) { | |
329 | dev_err(&st95context->spicontext.spidev->dev, | |
330 | "err: echo response receieve error = 0x%x\n", result); | |
331 | return result; | |
332 | } | |
333 | ||
334 | if (echo_response == ECHORESPONSE) | |
335 | return 0; | |
336 | ||
337 | dev_err(&st95context->spicontext.spidev->dev, "err: echo res is 0x%x\n", | |
338 | echo_response); | |
339 | ||
340 | return -EIO; | |
341 | } | |
342 | ||
343 | static int secondary_configuration_type4a(struct st95hf_context *stcontext) | |
344 | { | |
345 | int result = 0; | |
346 | struct device *dev = &stcontext->nfcdev->dev; | |
347 | ||
348 | /* 14443A config setting after select protocol */ | |
349 | result = st95hf_send_recv_cmd(stcontext, | |
350 | CMD_ISO14443A_CONFIG, | |
351 | 0, | |
352 | NULL, | |
353 | true); | |
354 | if (result) { | |
355 | dev_err(dev, "type a config cmd, err = 0x%x\n", result); | |
356 | return result; | |
357 | } | |
358 | ||
359 | /* 14443A demo gain setting */ | |
360 | result = st95hf_send_recv_cmd(stcontext, | |
361 | CMD_ISO14443A_DEMOGAIN, | |
362 | 0, | |
363 | NULL, | |
364 | true); | |
365 | if (result) | |
366 | dev_err(dev, "type a demogain cmd, err = 0x%x\n", result); | |
367 | ||
368 | return result; | |
369 | } | |
370 | ||
371 | static int secondary_configuration_type4b(struct st95hf_context *stcontext) | |
372 | { | |
373 | int result = 0; | |
374 | struct device *dev = &stcontext->nfcdev->dev; | |
375 | ||
376 | result = st95hf_send_recv_cmd(stcontext, | |
377 | CMD_ISO14443B_DEMOGAIN, | |
378 | 0, | |
379 | NULL, | |
380 | true); | |
381 | if (result) | |
382 | dev_err(dev, "type b demogain cmd, err = 0x%x\n", result); | |
383 | ||
384 | return result; | |
385 | } | |
386 | ||
387 | static int st95hf_select_protocol(struct st95hf_context *stcontext, int type) | |
388 | { | |
389 | int result = 0; | |
390 | struct device *dev; | |
391 | ||
392 | dev = &stcontext->nfcdev->dev; | |
393 | ||
394 | switch (type) { | |
395 | case NFC_DIGITAL_RF_TECH_106A: | |
396 | stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
397 | result = st95hf_send_recv_cmd(stcontext, | |
398 | CMD_ISO14443A_PROTOCOL_SELECT, | |
399 | 0, | |
400 | NULL, | |
401 | true); | |
402 | if (result) { | |
403 | dev_err(dev, "protocol sel, err = 0x%x\n", | |
404 | result); | |
405 | return result; | |
406 | } | |
407 | ||
408 | /* secondary config. for 14443Type 4A after protocol select */ | |
409 | result = secondary_configuration_type4a(stcontext); | |
410 | if (result) { | |
411 | dev_err(dev, "type a secondary config, err = 0x%x\n", | |
412 | result); | |
413 | return result; | |
414 | } | |
415 | break; | |
416 | case NFC_DIGITAL_RF_TECH_106B: | |
417 | stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106B; | |
418 | result = st95hf_send_recv_cmd(stcontext, | |
419 | CMD_ISO14443B_PROTOCOL_SELECT, | |
420 | 0, | |
421 | NULL, | |
422 | true); | |
423 | if (result) { | |
424 | dev_err(dev, "protocol sel send, err = 0x%x\n", | |
425 | result); | |
426 | return result; | |
427 | } | |
428 | ||
429 | /* | |
430 | * delay of 5-6 ms is required after select protocol | |
431 | * command in case of ISO14443 Type B | |
432 | */ | |
433 | usleep_range(50000, 60000); | |
434 | ||
435 | /* secondary config. for 14443Type 4B after protocol select */ | |
436 | result = secondary_configuration_type4b(stcontext); | |
437 | if (result) { | |
438 | dev_err(dev, "type b secondary config, err = 0x%x\n", | |
439 | result); | |
440 | return result; | |
441 | } | |
442 | break; | |
443 | case NFC_DIGITAL_RF_TECH_ISO15693: | |
444 | stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_ISO15693; | |
445 | result = st95hf_send_recv_cmd(stcontext, | |
446 | CMD_ISO15693_PROTOCOL_SELECT, | |
447 | 0, | |
448 | NULL, | |
449 | true); | |
450 | if (result) { | |
451 | dev_err(dev, "protocol sel send, err = 0x%x\n", | |
452 | result); | |
453 | return result; | |
454 | } | |
455 | break; | |
456 | default: | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static void st95hf_send_st95enable_negativepulse(struct st95hf_context *st95con) | |
464 | { | |
465 | /* First make irq_in pin high */ | |
466 | gpio_set_value(st95con->enable_gpio, HIGH); | |
467 | ||
468 | /* wait for 1 milisecond */ | |
469 | usleep_range(1000, 2000); | |
470 | ||
471 | /* Make irq_in pin low */ | |
472 | gpio_set_value(st95con->enable_gpio, LOW); | |
473 | ||
474 | /* wait for minimum interrupt pulse to make st95 active */ | |
475 | usleep_range(1000, 2000); | |
476 | ||
477 | /* At end make it high */ | |
478 | gpio_set_value(st95con->enable_gpio, HIGH); | |
479 | } | |
480 | ||
481 | /* | |
482 | * Send a reset sequence over SPI bus (Reset command + wait 3ms + | |
483 | * negative pulse on st95hf enable gpio | |
484 | */ | |
485 | static int st95hf_send_spi_reset_sequence(struct st95hf_context *st95context) | |
486 | { | |
487 | int result = 0; | |
488 | unsigned char reset_cmd = ST95HF_COMMAND_RESET; | |
489 | ||
490 | result = st95hf_spi_send(&st95context->spicontext, | |
491 | &reset_cmd, | |
492 | ST95HF_RESET_CMD_LEN, | |
493 | ASYNC); | |
494 | if (result) { | |
495 | dev_err(&st95context->spicontext.spidev->dev, | |
496 | "spi reset sequence cmd error = %d", result); | |
497 | return result; | |
498 | } | |
499 | ||
500 | /* wait for 3 milisecond to complete the controller reset process */ | |
501 | usleep_range(3000, 4000); | |
502 | ||
503 | /* send negative pulse to make st95hf active */ | |
504 | st95hf_send_st95enable_negativepulse(st95context); | |
505 | ||
506 | /* wait for 10 milisecond : HFO setup time */ | |
507 | usleep_range(10000, 20000); | |
508 | ||
509 | return result; | |
510 | } | |
511 | ||
512 | static int st95hf_por_sequence(struct st95hf_context *st95context) | |
513 | { | |
514 | int nth_attempt = 1; | |
515 | int result; | |
516 | ||
517 | st95hf_send_st95enable_negativepulse(st95context); | |
518 | ||
519 | usleep_range(5000, 6000); | |
520 | do { | |
521 | /* send an ECHO command and checks ST95HF response */ | |
522 | result = st95hf_echo_command(st95context); | |
523 | ||
524 | dev_dbg(&st95context->spicontext.spidev->dev, | |
525 | "response from echo function = 0x%x, attempt = %d\n", | |
526 | result, nth_attempt); | |
527 | ||
528 | if (!result) | |
529 | return 0; | |
530 | ||
531 | /* send an pulse on IRQ in case of the chip is on sleep state */ | |
532 | if (nth_attempt == 2) | |
533 | st95hf_send_st95enable_negativepulse(st95context); | |
534 | else | |
535 | st95hf_send_spi_reset_sequence(st95context); | |
536 | ||
537 | /* delay of 50 milisecond */ | |
538 | usleep_range(50000, 51000); | |
539 | } while (nth_attempt++ < 3); | |
540 | ||
541 | return -ETIMEDOUT; | |
542 | } | |
543 | ||
544 | static int iso14443_config_fdt(struct st95hf_context *st95context, int wtxm) | |
545 | { | |
546 | int result = 0; | |
547 | struct device *dev = &st95context->spicontext.spidev->dev; | |
548 | struct nfc_digital_dev *nfcddev = st95context->ddev; | |
549 | unsigned char pp_typeb; | |
550 | struct param_list new_params[2]; | |
551 | ||
552 | pp_typeb = cmd_array[CMD_ISO14443B_PROTOCOL_SELECT].cmd_params[2]; | |
553 | ||
554 | if (nfcddev->curr_protocol == NFC_PROTO_ISO14443 && | |
555 | st95context->fwi < 4) | |
556 | st95context->fwi = 4; | |
557 | ||
558 | new_params[0].param_offset = 2; | |
559 | if (nfcddev->curr_protocol == NFC_PROTO_ISO14443) | |
560 | new_params[0].new_param_val = st95context->fwi; | |
561 | else if (nfcddev->curr_protocol == NFC_PROTO_ISO14443_B) | |
562 | new_params[0].new_param_val = pp_typeb; | |
563 | ||
564 | new_params[1].param_offset = 3; | |
565 | new_params[1].new_param_val = wtxm; | |
566 | ||
567 | switch (nfcddev->curr_protocol) { | |
568 | case NFC_PROTO_ISO14443: | |
569 | result = st95hf_send_recv_cmd(st95context, | |
570 | CMD_ISO14443A_PROTOCOL_SELECT, | |
571 | 2, | |
572 | new_params, | |
573 | true); | |
574 | if (result) { | |
575 | dev_err(dev, "WTX type a sel proto, err = 0x%x\n", | |
576 | result); | |
577 | return result; | |
578 | } | |
579 | ||
580 | /* secondary config. for 14443Type 4A after protocol select */ | |
581 | result = secondary_configuration_type4a(st95context); | |
582 | if (result) { | |
583 | dev_err(dev, "WTX type a second. config, err = 0x%x\n", | |
584 | result); | |
585 | return result; | |
586 | } | |
587 | break; | |
588 | case NFC_PROTO_ISO14443_B: | |
589 | result = st95hf_send_recv_cmd(st95context, | |
590 | CMD_ISO14443B_PROTOCOL_SELECT, | |
591 | 2, | |
592 | new_params, | |
593 | true); | |
594 | if (result) { | |
595 | dev_err(dev, "WTX type b sel proto, err = 0x%x\n", | |
596 | result); | |
597 | return result; | |
598 | } | |
599 | ||
600 | /* secondary config. for 14443Type 4B after protocol select */ | |
601 | result = secondary_configuration_type4b(st95context); | |
602 | if (result) { | |
603 | dev_err(dev, "WTX type b second. config, err = 0x%x\n", | |
604 | result); | |
605 | return result; | |
606 | } | |
607 | break; | |
608 | default: | |
609 | return -EINVAL; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static int st95hf_handle_wtx(struct st95hf_context *stcontext, | |
616 | bool new_wtx, | |
617 | int wtx_val) | |
618 | { | |
619 | int result = 0; | |
620 | unsigned char val_mm = 0; | |
621 | struct param_list new_params[1]; | |
622 | struct nfc_digital_dev *nfcddev = stcontext->ddev; | |
623 | struct device *dev = &stcontext->nfcdev->dev; | |
624 | ||
625 | if (new_wtx) { | |
626 | result = iso14443_config_fdt(stcontext, wtx_val & 0x3f); | |
627 | if (result) { | |
628 | dev_err(dev, "Config. setting error on WTX req, err = 0x%x\n", | |
629 | result); | |
630 | return result; | |
631 | } | |
632 | ||
633 | /* Send response of wtx with ASYNC as no response expected */ | |
634 | new_params[0].param_offset = 1; | |
635 | new_params[0].new_param_val = wtx_val; | |
636 | ||
637 | result = st95hf_send_recv_cmd(stcontext, | |
638 | CMD_WTX_RESPONSE, | |
639 | 1, | |
640 | new_params, | |
641 | false); | |
642 | if (result) | |
643 | dev_err(dev, "WTX response send, err = 0x%x\n", result); | |
644 | return result; | |
645 | } | |
646 | ||
647 | /* if no new wtx, cofigure with default values */ | |
648 | if (nfcddev->curr_protocol == NFC_PROTO_ISO14443) | |
649 | val_mm = cmd_array[CMD_ISO14443A_PROTOCOL_SELECT].cmd_params[3]; | |
650 | else if (nfcddev->curr_protocol == NFC_PROTO_ISO14443_B) | |
651 | val_mm = cmd_array[CMD_ISO14443B_PROTOCOL_SELECT].cmd_params[3]; | |
652 | ||
653 | result = iso14443_config_fdt(stcontext, val_mm); | |
654 | if (result) | |
655 | dev_err(dev, "Default config. setting error after WTX processing, err = 0x%x\n", | |
656 | result); | |
657 | ||
658 | return result; | |
659 | } | |
660 | ||
661 | static int st95hf_error_handling(struct st95hf_context *stcontext, | |
662 | struct sk_buff *skb_resp, | |
663 | int res_len) | |
664 | { | |
665 | int result = 0; | |
666 | unsigned char error_byte; | |
667 | struct device *dev = &stcontext->nfcdev->dev; | |
668 | ||
669 | /* First check ST95HF specific error */ | |
670 | if (skb_resp->data[0] & ST95HF_ERR_MASK) { | |
671 | if (skb_resp->data[0] == ST95HF_TIMEOUT_ERROR) | |
672 | result = -ETIMEDOUT; | |
673 | else | |
674 | result = -EIO; | |
675 | return result; | |
676 | } | |
677 | ||
678 | /* Check for CRC err only if CRC is present in the tag response */ | |
679 | switch (stcontext->current_rf_tech) { | |
680 | case NFC_DIGITAL_RF_TECH_106A: | |
681 | if (stcontext->sendrcv_trflag == TRFLAG_NFCA_STD_FRAME_CRC) { | |
682 | error_byte = skb_resp->data[res_len - 3]; | |
683 | if (error_byte & ST95HF_NFCA_CRC_ERR_MASK) { | |
684 | /* CRC error occurred */ | |
685 | dev_err(dev, "CRC error, byte received = 0x%x\n", | |
686 | error_byte); | |
687 | result = -EIO; | |
688 | } | |
689 | } | |
690 | break; | |
691 | case NFC_DIGITAL_RF_TECH_106B: | |
692 | case NFC_DIGITAL_RF_TECH_ISO15693: | |
693 | error_byte = skb_resp->data[res_len - 1]; | |
694 | if (error_byte & ST95HF_NFCB_CRC_ERR_MASK) { | |
695 | /* CRC error occurred */ | |
696 | dev_err(dev, "CRC error, byte received = 0x%x\n", | |
697 | error_byte); | |
698 | result = -EIO; | |
699 | } | |
700 | break; | |
701 | } | |
702 | ||
703 | return result; | |
704 | } | |
705 | ||
706 | static int st95hf_response_handler(struct st95hf_context *stcontext, | |
707 | struct sk_buff *skb_resp, | |
708 | int res_len) | |
709 | { | |
710 | int result = 0; | |
711 | int skb_len; | |
712 | unsigned char val_mm; | |
713 | struct nfc_digital_dev *nfcddev = stcontext->ddev; | |
714 | struct device *dev = &stcontext->nfcdev->dev; | |
715 | struct st95_digital_cmd_complete_arg *cb_arg; | |
716 | ||
717 | cb_arg = &stcontext->complete_cb_arg; | |
718 | ||
719 | /* Process the response */ | |
720 | skb_put(skb_resp, res_len); | |
721 | ||
722 | /* Remove st95 header */ | |
723 | skb_pull(skb_resp, 2); | |
724 | ||
725 | skb_len = skb_resp->len; | |
726 | ||
727 | /* check if it is case of RATS request reply & FWI is present */ | |
728 | if (nfcddev->curr_protocol == NFC_PROTO_ISO14443 && cb_arg->rats && | |
729 | (skb_resp->data[1] & RATS_TB1_PRESENT_MASK)) { | |
730 | if (skb_resp->data[1] & RATS_TA1_PRESENT_MASK) | |
731 | stcontext->fwi = | |
732 | (skb_resp->data[3] & TB1_FWI_MASK) >> 4; | |
733 | else | |
734 | stcontext->fwi = | |
735 | (skb_resp->data[2] & TB1_FWI_MASK) >> 4; | |
736 | ||
737 | val_mm = cmd_array[CMD_ISO14443A_PROTOCOL_SELECT].cmd_params[3]; | |
738 | ||
739 | result = iso14443_config_fdt(stcontext, val_mm); | |
740 | if (result) { | |
741 | dev_err(dev, "error in config_fdt to handle fwi of ATS, error=%d\n", | |
742 | result); | |
743 | return result; | |
744 | } | |
745 | } | |
746 | cb_arg->rats = false; | |
747 | ||
748 | /* Remove CRC bytes only if received frames data has an eod (CRC) */ | |
749 | switch (stcontext->current_rf_tech) { | |
750 | case NFC_DIGITAL_RF_TECH_106A: | |
751 | if (stcontext->sendrcv_trflag == TRFLAG_NFCA_STD_FRAME_CRC) | |
752 | skb_trim(skb_resp, (skb_len - 5)); | |
753 | else | |
754 | skb_trim(skb_resp, (skb_len - 3)); | |
755 | break; | |
756 | case NFC_DIGITAL_RF_TECH_106B: | |
757 | case NFC_DIGITAL_RF_TECH_ISO15693: | |
758 | skb_trim(skb_resp, (skb_len - 3)); | |
759 | break; | |
760 | } | |
761 | ||
762 | return result; | |
763 | } | |
764 | ||
6b52d994 | 765 | static irqreturn_t st95hf_irq_handler(int irq, void *st95hfcontext) |
cab47333 SS |
766 | { |
767 | struct st95hf_context *stcontext = | |
768 | (struct st95hf_context *)st95hfcontext; | |
769 | ||
770 | if (stcontext->spicontext.req_issync) { | |
771 | complete(&stcontext->spicontext.done); | |
772 | stcontext->spicontext.req_issync = false; | |
773 | return IRQ_HANDLED; | |
774 | } | |
775 | ||
776 | return IRQ_WAKE_THREAD; | |
777 | } | |
778 | ||
6b52d994 | 779 | static irqreturn_t st95hf_irq_thread_handler(int irq, void *st95hfcontext) |
cab47333 SS |
780 | { |
781 | int result = 0; | |
782 | int res_len; | |
783 | static bool wtx; | |
784 | struct device *dev; | |
785 | struct device *spidevice; | |
786 | struct nfc_digital_dev *nfcddev; | |
787 | struct sk_buff *skb_resp; | |
788 | struct st95hf_context *stcontext = | |
789 | (struct st95hf_context *)st95hfcontext; | |
790 | struct st95_digital_cmd_complete_arg *cb_arg; | |
791 | ||
792 | spidevice = &stcontext->spicontext.spidev->dev; | |
793 | ||
794 | /* | |
795 | * check semaphore, if not down() already, then we don't | |
796 | * know in which context the ISR is called and surely it | |
797 | * will be a bug. Note that down() of the semaphore is done | |
798 | * in the corresponding st95hf_in_send_cmd() and then | |
799 | * only this ISR should be called. ISR will up() the | |
800 | * semaphore before leaving. Hence when the ISR is called | |
801 | * the correct behaviour is down_trylock() should always | |
802 | * return 1 (indicating semaphore cant be taken and hence no | |
803 | * change in semaphore count). | |
804 | * If not, then we up() the semaphore and crash on | |
805 | * a BUG() ! | |
806 | */ | |
807 | if (!down_trylock(&stcontext->exchange_lock)) { | |
808 | up(&stcontext->exchange_lock); | |
809 | WARN(1, "unknown context in ST95HF ISR"); | |
810 | return IRQ_NONE; | |
811 | } | |
812 | ||
813 | cb_arg = &stcontext->complete_cb_arg; | |
814 | skb_resp = cb_arg->skb_resp; | |
815 | ||
816 | mutex_lock(&stcontext->rm_lock); | |
817 | res_len = st95hf_spi_recv_response(&stcontext->spicontext, | |
818 | skb_resp->data); | |
819 | if (res_len < 0) { | |
820 | dev_err(spidevice, "TISR spi response err = 0x%x\n", res_len); | |
821 | result = res_len; | |
822 | goto end; | |
823 | } | |
824 | ||
825 | /* if stcontext->nfcdev_free is true, it means remove already ran */ | |
826 | if (stcontext->nfcdev_free) { | |
827 | result = -ENODEV; | |
828 | goto end; | |
829 | } | |
830 | ||
831 | dev = &stcontext->nfcdev->dev; | |
832 | nfcddev = stcontext->ddev; | |
833 | if (skb_resp->data[2] == WTX_REQ_FROM_TAG) { | |
834 | /* Request for new FWT from tag */ | |
835 | result = st95hf_handle_wtx(stcontext, true, skb_resp->data[3]); | |
836 | if (result) | |
837 | goto end; | |
838 | ||
839 | wtx = true; | |
840 | mutex_unlock(&stcontext->rm_lock); | |
841 | return IRQ_HANDLED; | |
842 | } | |
843 | ||
844 | result = st95hf_error_handling(stcontext, skb_resp, res_len); | |
845 | if (result) | |
846 | goto end; | |
847 | ||
848 | result = st95hf_response_handler(stcontext, skb_resp, res_len); | |
849 | if (result) | |
850 | goto end; | |
851 | ||
852 | /* | |
853 | * If select protocol is done on wtx req. do select protocol | |
854 | * again with default values | |
855 | */ | |
856 | if (wtx) { | |
857 | wtx = false; | |
858 | result = st95hf_handle_wtx(stcontext, false, 0); | |
859 | if (result) | |
860 | goto end; | |
861 | } | |
862 | ||
863 | /* call digital layer callback */ | |
864 | cb_arg->complete_cb(stcontext->ddev, cb_arg->cb_usrarg, skb_resp); | |
865 | ||
866 | /* up the semaphore before returning */ | |
867 | up(&stcontext->exchange_lock); | |
868 | mutex_unlock(&stcontext->rm_lock); | |
869 | ||
870 | return IRQ_HANDLED; | |
871 | ||
872 | end: | |
873 | kfree_skb(skb_resp); | |
874 | wtx = false; | |
875 | cb_arg->rats = false; | |
876 | skb_resp = ERR_PTR(result); | |
877 | /* call of callback with error */ | |
878 | cb_arg->complete_cb(stcontext->ddev, cb_arg->cb_usrarg, skb_resp); | |
879 | /* up the semaphore before returning */ | |
880 | up(&stcontext->exchange_lock); | |
881 | mutex_unlock(&stcontext->rm_lock); | |
882 | return IRQ_HANDLED; | |
883 | } | |
884 | ||
885 | /* NFC ops functions definition */ | |
886 | static int st95hf_in_configure_hw(struct nfc_digital_dev *ddev, | |
887 | int type, | |
888 | int param) | |
889 | { | |
890 | struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev); | |
891 | ||
892 | if (type == NFC_DIGITAL_CONFIG_RF_TECH) | |
893 | return st95hf_select_protocol(stcontext, param); | |
894 | ||
895 | if (type == NFC_DIGITAL_CONFIG_FRAMING) { | |
896 | switch (param) { | |
897 | case NFC_DIGITAL_FRAMING_NFCA_SHORT: | |
898 | stcontext->sendrcv_trflag = TRFLAG_NFCA_SHORT_FRAME; | |
899 | break; | |
900 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
901 | stcontext->sendrcv_trflag = TRFLAG_NFCA_STD_FRAME; | |
902 | break; | |
903 | case NFC_DIGITAL_FRAMING_NFCA_T4T: | |
904 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: | |
905 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
906 | stcontext->sendrcv_trflag = TRFLAG_NFCA_STD_FRAME_CRC; | |
907 | break; | |
908 | case NFC_DIGITAL_FRAMING_NFCB: | |
909 | case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: | |
910 | case NFC_DIGITAL_FRAMING_ISO15693_T5T: | |
911 | break; | |
912 | } | |
913 | } | |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
918 | static int rf_off(struct st95hf_context *stcontext) | |
919 | { | |
920 | int rc; | |
921 | struct device *dev; | |
922 | ||
923 | dev = &stcontext->nfcdev->dev; | |
924 | ||
925 | rc = st95hf_send_recv_cmd(stcontext, CMD_FIELD_OFF, 0, NULL, true); | |
926 | if (rc) | |
927 | dev_err(dev, "protocol sel send field off, err = 0x%x\n", rc); | |
928 | ||
929 | return rc; | |
930 | } | |
931 | ||
932 | static int st95hf_in_send_cmd(struct nfc_digital_dev *ddev, | |
933 | struct sk_buff *skb, | |
934 | u16 timeout, | |
935 | nfc_digital_cmd_complete_t cb, | |
936 | void *arg) | |
937 | { | |
938 | struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev); | |
939 | int rc; | |
940 | struct sk_buff *skb_resp; | |
941 | int len_data_to_tag = 0; | |
942 | ||
943 | skb_resp = nfc_alloc_recv_skb(MAX_RESPONSE_BUFFER_SIZE, GFP_KERNEL); | |
944 | if (!skb_resp) { | |
945 | rc = -ENOMEM; | |
946 | goto error; | |
947 | } | |
948 | ||
949 | switch (stcontext->current_rf_tech) { | |
950 | case NFC_DIGITAL_RF_TECH_106A: | |
951 | len_data_to_tag = skb->len + 1; | |
4df864c1 | 952 | *(u8 *)skb_put(skb, 1) = stcontext->sendrcv_trflag; |
cab47333 SS |
953 | break; |
954 | case NFC_DIGITAL_RF_TECH_106B: | |
955 | case NFC_DIGITAL_RF_TECH_ISO15693: | |
956 | len_data_to_tag = skb->len; | |
957 | break; | |
958 | default: | |
959 | rc = -EINVAL; | |
960 | goto free_skb_resp; | |
961 | } | |
962 | ||
963 | skb_push(skb, 3); | |
964 | skb->data[0] = ST95HF_COMMAND_SEND; | |
965 | skb->data[1] = SEND_RECEIVE_CMD; | |
966 | skb->data[2] = len_data_to_tag; | |
967 | ||
968 | stcontext->complete_cb_arg.skb_resp = skb_resp; | |
969 | stcontext->complete_cb_arg.cb_usrarg = arg; | |
970 | stcontext->complete_cb_arg.complete_cb = cb; | |
971 | ||
972 | if ((skb->data[3] == ISO14443A_RATS_REQ) && | |
973 | ddev->curr_protocol == NFC_PROTO_ISO14443) | |
974 | stcontext->complete_cb_arg.rats = true; | |
975 | ||
976 | /* | |
977 | * down the semaphore to indicate to remove func that an | |
978 | * ISR is pending, note that it will not block here in any case. | |
979 | * If found blocked, it is a BUG! | |
980 | */ | |
981 | rc = down_killable(&stcontext->exchange_lock); | |
982 | if (rc) { | |
983 | WARN(1, "Semaphore is not found up in st95hf_in_send_cmd\n"); | |
984 | return rc; | |
985 | } | |
986 | ||
987 | rc = st95hf_spi_send(&stcontext->spicontext, skb->data, | |
988 | skb->len, | |
989 | ASYNC); | |
990 | if (rc) { | |
991 | dev_err(&stcontext->nfcdev->dev, | |
992 | "Error %d trying to perform data_exchange", rc); | |
993 | /* up the semaphore since ISR will never come in this case */ | |
994 | up(&stcontext->exchange_lock); | |
995 | goto free_skb_resp; | |
996 | } | |
997 | ||
998 | kfree_skb(skb); | |
999 | ||
1000 | return rc; | |
1001 | ||
1002 | free_skb_resp: | |
1003 | kfree_skb(skb_resp); | |
1004 | error: | |
1005 | return rc; | |
1006 | } | |
1007 | ||
1008 | /* p2p will be supported in a later release ! */ | |
1009 | static int st95hf_tg_configure_hw(struct nfc_digital_dev *ddev, | |
1010 | int type, | |
1011 | int param) | |
1012 | { | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int st95hf_tg_send_cmd(struct nfc_digital_dev *ddev, | |
1017 | struct sk_buff *skb, | |
1018 | u16 timeout, | |
1019 | nfc_digital_cmd_complete_t cb, | |
1020 | void *arg) | |
1021 | { | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | static int st95hf_tg_listen(struct nfc_digital_dev *ddev, | |
1026 | u16 timeout, | |
1027 | nfc_digital_cmd_complete_t cb, | |
1028 | void *arg) | |
1029 | { | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static int st95hf_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) | |
1034 | { | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static int st95hf_switch_rf(struct nfc_digital_dev *ddev, bool on) | |
1039 | { | |
1040 | u8 rf_tech; | |
1041 | struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev); | |
1042 | ||
1043 | rf_tech = ddev->curr_rf_tech; | |
1044 | ||
1045 | if (on) | |
1046 | /* switch on RF field */ | |
1047 | return st95hf_select_protocol(stcontext, rf_tech); | |
1048 | ||
1049 | /* switch OFF RF field */ | |
1050 | return rf_off(stcontext); | |
1051 | } | |
1052 | ||
1053 | /* TODO st95hf_abort_cmd */ | |
1054 | static void st95hf_abort_cmd(struct nfc_digital_dev *ddev) | |
1055 | { | |
1056 | } | |
1057 | ||
1058 | static struct nfc_digital_ops st95hf_nfc_digital_ops = { | |
1059 | .in_configure_hw = st95hf_in_configure_hw, | |
1060 | .in_send_cmd = st95hf_in_send_cmd, | |
1061 | ||
1062 | .tg_listen = st95hf_tg_listen, | |
1063 | .tg_configure_hw = st95hf_tg_configure_hw, | |
1064 | .tg_send_cmd = st95hf_tg_send_cmd, | |
1065 | .tg_get_rf_tech = st95hf_tg_get_rf_tech, | |
1066 | ||
1067 | .switch_rf = st95hf_switch_rf, | |
1068 | .abort_cmd = st95hf_abort_cmd, | |
1069 | }; | |
1070 | ||
1071 | static const struct spi_device_id st95hf_id[] = { | |
1072 | { "st95hf", 0 }, | |
1073 | {} | |
1074 | }; | |
1075 | MODULE_DEVICE_TABLE(spi, st95hf_id); | |
1076 | ||
1077 | static int st95hf_probe(struct spi_device *nfc_spi_dev) | |
1078 | { | |
1079 | int ret; | |
1080 | ||
1081 | struct st95hf_context *st95context; | |
1082 | struct st95hf_spi_context *spicontext; | |
1083 | ||
1084 | nfc_info(&nfc_spi_dev->dev, "ST95HF driver probe called.\n"); | |
1085 | ||
1086 | st95context = devm_kzalloc(&nfc_spi_dev->dev, | |
1087 | sizeof(struct st95hf_context), | |
1088 | GFP_KERNEL); | |
1089 | if (!st95context) | |
1090 | return -ENOMEM; | |
1091 | ||
1092 | spicontext = &st95context->spicontext; | |
1093 | ||
1094 | spicontext->spidev = nfc_spi_dev; | |
1095 | ||
1096 | st95context->fwi = | |
1097 | cmd_array[CMD_ISO14443A_PROTOCOL_SELECT].cmd_params[2]; | |
1098 | ||
1099 | if (device_property_present(&nfc_spi_dev->dev, "st95hfvin")) { | |
1100 | st95context->st95hf_supply = | |
1101 | devm_regulator_get(&nfc_spi_dev->dev, | |
1102 | "st95hfvin"); | |
1103 | if (IS_ERR(st95context->st95hf_supply)) { | |
1104 | dev_err(&nfc_spi_dev->dev, "failed to acquire regulator\n"); | |
1105 | return PTR_ERR(st95context->st95hf_supply); | |
1106 | } | |
1107 | ||
1108 | ret = regulator_enable(st95context->st95hf_supply); | |
1109 | if (ret) { | |
1110 | dev_err(&nfc_spi_dev->dev, "failed to enable regulator\n"); | |
1111 | return ret; | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | init_completion(&spicontext->done); | |
1116 | mutex_init(&spicontext->spi_lock); | |
1117 | ||
1118 | /* | |
1119 | * Store spicontext in spi device object for using it in | |
1120 | * remove function | |
1121 | */ | |
1122 | dev_set_drvdata(&nfc_spi_dev->dev, spicontext); | |
1123 | ||
1124 | st95context->enable_gpio = | |
1125 | of_get_named_gpio(nfc_spi_dev->dev.of_node, | |
1126 | "enable-gpio", | |
1127 | 0); | |
1128 | if (!gpio_is_valid(st95context->enable_gpio)) { | |
1129 | dev_err(&nfc_spi_dev->dev, "No valid enable gpio\n"); | |
1130 | ret = st95context->enable_gpio; | |
1131 | goto err_disable_regulator; | |
1132 | } | |
1133 | ||
1134 | ret = devm_gpio_request_one(&nfc_spi_dev->dev, st95context->enable_gpio, | |
1135 | GPIOF_DIR_OUT | GPIOF_INIT_HIGH, | |
1136 | "enable_gpio"); | |
1137 | if (ret) | |
1138 | goto err_disable_regulator; | |
1139 | ||
1140 | if (nfc_spi_dev->irq > 0) { | |
1141 | if (devm_request_threaded_irq(&nfc_spi_dev->dev, | |
1142 | nfc_spi_dev->irq, | |
6b52d994 SS |
1143 | st95hf_irq_handler, |
1144 | st95hf_irq_thread_handler, | |
cab47333 SS |
1145 | IRQF_TRIGGER_FALLING, |
1146 | "st95hf", | |
1147 | (void *)st95context) < 0) { | |
1148 | dev_err(&nfc_spi_dev->dev, "err: irq request for st95hf is failed\n"); | |
1149 | ret = -EINVAL; | |
1150 | goto err_disable_regulator; | |
1151 | } | |
1152 | } else { | |
1153 | dev_err(&nfc_spi_dev->dev, "not a valid IRQ associated with ST95HF\n"); | |
1154 | ret = -EINVAL; | |
1155 | goto err_disable_regulator; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * First reset SPI to handle warm reset of the system. | |
1160 | * It will put the ST95HF device in Power ON state | |
1161 | * which make the state of device identical to state | |
1162 | * at the time of cold reset of the system. | |
1163 | */ | |
1164 | ret = st95hf_send_spi_reset_sequence(st95context); | |
1165 | if (ret) { | |
1166 | dev_err(&nfc_spi_dev->dev, "err: spi_reset_sequence failed\n"); | |
1167 | goto err_disable_regulator; | |
1168 | } | |
1169 | ||
1170 | /* call PowerOnReset sequence of ST95hf to activate it */ | |
1171 | ret = st95hf_por_sequence(st95context); | |
1172 | if (ret) { | |
1173 | dev_err(&nfc_spi_dev->dev, "err: por seq failed for st95hf\n"); | |
1174 | goto err_disable_regulator; | |
1175 | } | |
1176 | ||
1177 | /* create NFC dev object and register with NFC Subsystem */ | |
1178 | st95context->ddev = nfc_digital_allocate_device(&st95hf_nfc_digital_ops, | |
1179 | ST95HF_SUPPORTED_PROT, | |
1180 | ST95HF_CAPABILITIES, | |
1181 | ST95HF_HEADROOM_LEN, | |
1182 | ST95HF_TAILROOM_LEN); | |
1183 | if (!st95context->ddev) { | |
1184 | ret = -ENOMEM; | |
1185 | goto err_disable_regulator; | |
1186 | } | |
1187 | ||
1188 | st95context->nfcdev = st95context->ddev->nfc_dev; | |
1189 | nfc_digital_set_parent_dev(st95context->ddev, &nfc_spi_dev->dev); | |
1190 | ||
1191 | ret = nfc_digital_register_device(st95context->ddev); | |
1192 | if (ret) { | |
1193 | dev_err(&st95context->nfcdev->dev, "st95hf registration failed\n"); | |
1194 | goto err_free_digital_device; | |
1195 | } | |
1196 | ||
1197 | /* store st95context in nfc device object */ | |
1198 | nfc_digital_set_drvdata(st95context->ddev, st95context); | |
1199 | ||
1200 | sema_init(&st95context->exchange_lock, 1); | |
1201 | mutex_init(&st95context->rm_lock); | |
1202 | ||
1203 | return ret; | |
1204 | ||
1205 | err_free_digital_device: | |
1206 | nfc_digital_free_device(st95context->ddev); | |
1207 | err_disable_regulator: | |
1208 | if (st95context->st95hf_supply) | |
1209 | regulator_disable(st95context->st95hf_supply); | |
1210 | ||
1211 | return ret; | |
1212 | } | |
1213 | ||
1214 | static int st95hf_remove(struct spi_device *nfc_spi_dev) | |
1215 | { | |
1216 | int result = 0; | |
1217 | unsigned char reset_cmd = ST95HF_COMMAND_RESET; | |
1218 | struct st95hf_spi_context *spictx = dev_get_drvdata(&nfc_spi_dev->dev); | |
1219 | ||
1220 | struct st95hf_context *stcontext = container_of(spictx, | |
1221 | struct st95hf_context, | |
1222 | spicontext); | |
1223 | ||
1224 | mutex_lock(&stcontext->rm_lock); | |
1225 | ||
1226 | nfc_digital_unregister_device(stcontext->ddev); | |
1227 | nfc_digital_free_device(stcontext->ddev); | |
1228 | stcontext->nfcdev_free = true; | |
1229 | ||
1230 | mutex_unlock(&stcontext->rm_lock); | |
1231 | ||
1232 | /* if last in_send_cmd's ISR is pending, wait for it to finish */ | |
1233 | result = down_killable(&stcontext->exchange_lock); | |
1234 | if (result == -EINTR) | |
1235 | dev_err(&spictx->spidev->dev, "sleep for semaphore interrupted by signal\n"); | |
1236 | ||
1237 | /* next reset the ST95HF controller */ | |
1238 | result = st95hf_spi_send(&stcontext->spicontext, | |
1239 | &reset_cmd, | |
1240 | ST95HF_RESET_CMD_LEN, | |
1241 | ASYNC); | |
1242 | if (result) { | |
1243 | dev_err(&spictx->spidev->dev, | |
1244 | "ST95HF reset failed in remove() err = %d\n", result); | |
1245 | return result; | |
1246 | } | |
1247 | ||
1248 | /* wait for 3 ms to complete the controller reset process */ | |
1249 | usleep_range(3000, 4000); | |
1250 | ||
1251 | /* disable regulator */ | |
1252 | if (stcontext->st95hf_supply) | |
1253 | regulator_disable(stcontext->st95hf_supply); | |
1254 | ||
1255 | return result; | |
1256 | } | |
1257 | ||
1258 | /* Register as SPI protocol driver */ | |
1259 | static struct spi_driver st95hf_driver = { | |
1260 | .driver = { | |
1261 | .name = "st95hf", | |
1262 | .owner = THIS_MODULE, | |
1263 | }, | |
1264 | .id_table = st95hf_id, | |
1265 | .probe = st95hf_probe, | |
1266 | .remove = st95hf_remove, | |
1267 | }; | |
1268 | ||
1269 | module_spi_driver(st95hf_driver); | |
1270 | ||
1271 | MODULE_AUTHOR("Shikha Singh <shikha.singh@st.com>"); | |
1272 | MODULE_DESCRIPTION("ST NFC Transceiver ST95HF driver"); | |
1273 | MODULE_LICENSE("GPL v2"); |