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68957303 CR |
1 | /* |
2 | * I2C Link Layer for ST21NFCA HCI based Driver | |
3 | * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
19 | ||
20 | #include <linux/crc-ccitt.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/i2c.h> | |
dfa8070d | 23 | #include <linux/gpio/consumer.h> |
c44cb2ed CR |
24 | #include <linux/of_irq.h> |
25 | #include <linux/of_gpio.h> | |
dfa8070d | 26 | #include <linux/acpi.h> |
68957303 CR |
27 | #include <linux/interrupt.h> |
28 | #include <linux/delay.h> | |
29 | #include <linux/nfc.h> | |
30 | #include <linux/firmware.h> | |
79557b33 | 31 | |
db083bcb | 32 | #include <asm/unaligned.h> |
68957303 CR |
33 | |
34 | #include <net/nfc/hci.h> | |
35 | #include <net/nfc/llc.h> | |
36 | #include <net/nfc/nfc.h> | |
37 | ||
38 | #include "st21nfca.h" | |
39 | ||
40 | /* | |
41 | * Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF. | |
42 | * Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism | |
43 | * called byte stuffing has been introduced. | |
44 | * | |
45 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
46 | * - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
47 | * - xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
48 | */ | |
49 | #define ST21NFCA_SOF_EOF 0x7e | |
50 | #define ST21NFCA_BYTE_STUFFING_MASK 0x20 | |
51 | #define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d | |
52 | ||
e1fb97b9 | 53 | /* SOF + 00 */ |
68957303 CR |
54 | #define ST21NFCA_FRAME_HEADROOM 2 |
55 | ||
e1fb97b9 CR |
56 | /* 2 bytes crc + EOF */ |
57 | #define ST21NFCA_FRAME_TAILROOM 3 | |
c97ffdbf CR |
58 | #define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \ |
59 | buf[1] == 0) | |
68957303 | 60 | |
79557b33 | 61 | #define ST21NFCA_HCI_DRIVER_NAME "st21nfca_hci" |
68957303 CR |
62 | #define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c" |
63 | ||
68957303 CR |
64 | struct st21nfca_i2c_phy { |
65 | struct i2c_client *i2c_dev; | |
66 | struct nfc_hci_dev *hdev; | |
67 | ||
8d3c50e2 | 68 | struct gpio_desc *gpiod_ena; |
2130fb97 CR |
69 | struct st21nfca_se_status se_status; |
70 | ||
68957303 CR |
71 | struct sk_buff *pending_skb; |
72 | int current_read_len; | |
73 | /* | |
74 | * crc might have fail because i2c macro | |
75 | * is disable due to other interface activity | |
76 | */ | |
77 | int crc_trials; | |
78 | ||
79 | int powered; | |
80 | int run_mode; | |
81 | ||
82 | /* | |
83 | * < 0 if hardware error occured (e.g. i2c err) | |
84 | * and prevents normal operation. | |
85 | */ | |
86 | int hard_fault; | |
a3c5d8fb | 87 | struct mutex phy_lock; |
68957303 | 88 | }; |
57dc828a | 89 | |
0531107e | 90 | static u8 len_seq[] = { 16, 24, 12, 29 }; |
68957303 CR |
91 | static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40}; |
92 | ||
93 | #define I2C_DUMP_SKB(info, skb) \ | |
94 | do { \ | |
95 | pr_debug("%s:\n", info); \ | |
96 | print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \ | |
97 | 16, 1, (skb)->data, (skb)->len, 0); \ | |
98 | } while (0) | |
99 | ||
18d2c624 CR |
100 | /* |
101 | * In order to get the CLF in a known state we generate an internal reboot | |
102 | * using a proprietary command. | |
103 | * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF | |
104 | * fill buffer. | |
105 | */ | |
106 | static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy) | |
68957303 | 107 | { |
c5b0c370 | 108 | u16 wait_reboot[] = { 50, 300, 1000 }; |
68957303 CR |
109 | char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E }; |
110 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE]; | |
111 | int i, r = -1; | |
112 | ||
18d2c624 CR |
113 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { |
114 | r = i2c_master_send(phy->i2c_dev, reboot_cmd, | |
115 | sizeof(reboot_cmd)); | |
116 | if (r < 0) | |
117 | msleep(wait_reboot[i]); | |
118 | } | |
119 | if (r < 0) | |
120 | return r; | |
121 | ||
122 | /* CLF is spending about 20ms to do an internal reboot */ | |
123 | msleep(20); | |
124 | r = -1; | |
125 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { | |
68957303 CR |
126 | r = i2c_master_recv(phy->i2c_dev, tmp, |
127 | ST21NFCA_HCI_LLC_MAX_SIZE); | |
18d2c624 CR |
128 | if (r < 0) |
129 | msleep(wait_reboot[i]); | |
130 | } | |
131 | if (r < 0) | |
132 | return r; | |
68957303 | 133 | |
18d2c624 CR |
134 | for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE && |
135 | tmp[i] == ST21NFCA_SOF_EOF; i++) | |
136 | ; | |
137 | ||
138 | if (r != ST21NFCA_HCI_LLC_MAX_SIZE) | |
139 | return -ENODEV; | |
68957303 | 140 | |
18d2c624 CR |
141 | usleep_range(1000, 1500); |
142 | return 0; | |
68957303 CR |
143 | } |
144 | ||
145 | static int st21nfca_hci_i2c_enable(void *phy_id) | |
146 | { | |
147 | struct st21nfca_i2c_phy *phy = phy_id; | |
148 | ||
8d3c50e2 | 149 | gpiod_set_value(phy->gpiod_ena, 1); |
68957303 CR |
150 | phy->powered = 1; |
151 | phy->run_mode = ST21NFCA_HCI_MODE; | |
152 | ||
153 | usleep_range(10000, 15000); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static void st21nfca_hci_i2c_disable(void *phy_id) | |
159 | { | |
160 | struct st21nfca_i2c_phy *phy = phy_id; | |
161 | ||
8d3c50e2 | 162 | gpiod_set_value(phy->gpiod_ena, 0); |
68957303 CR |
163 | |
164 | phy->powered = 0; | |
165 | } | |
166 | ||
e1fb97b9 | 167 | static void st21nfca_hci_add_len_crc(struct sk_buff *skb) |
68957303 | 168 | { |
68957303 CR |
169 | u16 crc; |
170 | u8 tmp; | |
171 | ||
d58ff351 | 172 | *(u8 *)skb_push(skb, 1) = 0; |
68957303 CR |
173 | |
174 | crc = crc_ccitt(0xffff, skb->data, skb->len); | |
175 | crc = ~crc; | |
176 | ||
177 | tmp = crc & 0x00ff; | |
634fef61 | 178 | skb_put_u8(skb, tmp); |
68957303 CR |
179 | |
180 | tmp = (crc >> 8) & 0x00ff; | |
634fef61 | 181 | skb_put_u8(skb, tmp); |
68957303 CR |
182 | } |
183 | ||
e1fb97b9 | 184 | static void st21nfca_hci_remove_len_crc(struct sk_buff *skb) |
68957303 CR |
185 | { |
186 | skb_pull(skb, ST21NFCA_FRAME_HEADROOM); | |
e1fb97b9 | 187 | skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM); |
68957303 CR |
188 | } |
189 | ||
190 | /* | |
191 | * Writing a frame must not return the number of written bytes. | |
192 | * It must return either zero for success, or <0 for error. | |
193 | * In addition, it must not alter the skb | |
194 | */ | |
195 | static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb) | |
196 | { | |
e1fb97b9 | 197 | int r = -1, i, j; |
68957303 CR |
198 | struct st21nfca_i2c_phy *phy = phy_id; |
199 | struct i2c_client *client = phy->i2c_dev; | |
68957303 CR |
200 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2]; |
201 | ||
202 | I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb); | |
203 | ||
68957303 CR |
204 | if (phy->hard_fault != 0) |
205 | return phy->hard_fault; | |
206 | ||
207 | /* | |
208 | * Compute CRC before byte stuffing computation on frame | |
209 | * Note st21nfca_hci_add_len_crc is doing a byte stuffing | |
210 | * on its own value | |
211 | */ | |
e1fb97b9 | 212 | st21nfca_hci_add_len_crc(skb); |
68957303 CR |
213 | |
214 | /* add ST21NFCA_SOF_EOF on tail */ | |
634fef61 | 215 | skb_put_u8(skb, ST21NFCA_SOF_EOF); |
68957303 | 216 | /* add ST21NFCA_SOF_EOF on head */ |
d58ff351 | 217 | *(u8 *)skb_push(skb, 1) = ST21NFCA_SOF_EOF; |
68957303 CR |
218 | |
219 | /* | |
220 | * Compute byte stuffing | |
221 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
222 | * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
223 | * xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
224 | */ | |
225 | tmp[0] = skb->data[0]; | |
226 | for (i = 1, j = 1; i < skb->len - 1; i++, j++) { | |
227 | if (skb->data[i] == ST21NFCA_SOF_EOF | |
228 | || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) { | |
229 | tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING; | |
230 | j++; | |
231 | tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK; | |
232 | } else { | |
233 | tmp[j] = skb->data[i]; | |
234 | } | |
235 | } | |
236 | tmp[j] = skb->data[i]; | |
237 | j++; | |
238 | ||
239 | /* | |
240 | * Manage sleep mode | |
241 | * Try 3 times to send data with delay between each | |
242 | */ | |
a3c5d8fb | 243 | mutex_lock(&phy->phy_lock); |
68957303 CR |
244 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) { |
245 | r = i2c_master_send(client, tmp, j); | |
246 | if (r < 0) | |
247 | msleep(wait_tab[i]); | |
248 | } | |
a3c5d8fb | 249 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
250 | |
251 | if (r >= 0) { | |
252 | if (r != j) | |
253 | r = -EREMOTEIO; | |
254 | else | |
255 | r = 0; | |
256 | } | |
257 | ||
e1fb97b9 | 258 | st21nfca_hci_remove_len_crc(skb); |
68957303 CR |
259 | |
260 | return r; | |
261 | } | |
262 | ||
263 | static int get_frame_size(u8 *buf, int buflen) | |
264 | { | |
265 | int len = 0; | |
3e6df919 | 266 | |
68957303 CR |
267 | if (buf[len + 1] == ST21NFCA_SOF_EOF) |
268 | return 0; | |
269 | ||
270 | for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++) | |
271 | ; | |
272 | ||
273 | return len; | |
274 | } | |
275 | ||
276 | static int check_crc(u8 *buf, int buflen) | |
277 | { | |
278 | u16 crc; | |
279 | ||
280 | crc = crc_ccitt(0xffff, buf, buflen - 2); | |
281 | crc = ~crc; | |
282 | ||
283 | if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) { | |
284 | pr_err(ST21NFCA_HCI_DRIVER_NAME | |
285 | ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1], | |
286 | buf[buflen - 2]); | |
287 | ||
288 | pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__); | |
289 | print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, | |
290 | 16, 2, buf, buflen, false); | |
291 | return -EPERM; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Prepare received data for upper layer. | |
298 | * Received data include byte stuffing, crc and sof/eof | |
299 | * which is not usable by hci part. | |
300 | * returns: | |
301 | * frame size without sof/eof, header and byte stuffing | |
302 | * -EBADMSG : frame was incorrect and discarded | |
303 | */ | |
304 | static int st21nfca_hci_i2c_repack(struct sk_buff *skb) | |
305 | { | |
306 | int i, j, r, size; | |
3e6df919 | 307 | |
68957303 CR |
308 | if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0)) |
309 | return -EBADMSG; | |
310 | ||
311 | size = get_frame_size(skb->data, skb->len); | |
312 | if (size > 0) { | |
313 | skb_trim(skb, size); | |
314 | /* remove ST21NFCA byte stuffing for upper layer */ | |
315 | for (i = 1, j = 0; i < skb->len; i++) { | |
3096e25a | 316 | if (skb->data[i + j] == |
68957303 | 317 | (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) { |
3096e25a CR |
318 | skb->data[i] = skb->data[i + j + 1] |
319 | | ST21NFCA_BYTE_STUFFING_MASK; | |
68957303 CR |
320 | i++; |
321 | j++; | |
322 | } | |
323 | skb->data[i] = skb->data[i + j]; | |
324 | } | |
325 | /* remove byte stuffing useless byte */ | |
326 | skb_trim(skb, i - j); | |
327 | /* remove ST21NFCA_SOF_EOF from head */ | |
328 | skb_pull(skb, 1); | |
329 | ||
330 | r = check_crc(skb->data, skb->len); | |
331 | if (r != 0) { | |
332 | i = 0; | |
333 | return -EBADMSG; | |
334 | } | |
335 | ||
336 | /* remove headbyte */ | |
337 | skb_pull(skb, 1); | |
338 | /* remove crc. Byte Stuffing is already removed here */ | |
339 | skb_trim(skb, skb->len - 2); | |
340 | return skb->len; | |
341 | } | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees | |
347 | * that i2c bus will be flushed and that next read will start on a new frame. | |
348 | * returned skb contains only LLC header and payload. | |
349 | * returns: | |
350 | * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at | |
351 | * end of read) | |
352 | * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF | |
353 | * at end of read) | |
354 | * -EREMOTEIO : i2c read error (fatal) | |
355 | * -EBADMSG : frame was incorrect and discarded | |
356 | * (value returned from st21nfca_hci_i2c_repack) | |
357 | * -EIO : if no ST21NFCA_SOF_EOF is found after reaching | |
358 | * the read length end sequence | |
359 | */ | |
360 | static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy, | |
361 | struct sk_buff *skb) | |
362 | { | |
363 | int r, i; | |
364 | u8 len; | |
c97ffdbf | 365 | u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD]; |
68957303 CR |
366 | struct i2c_client *client = phy->i2c_dev; |
367 | ||
368 | if (phy->current_read_len < ARRAY_SIZE(len_seq)) { | |
369 | len = len_seq[phy->current_read_len]; | |
370 | ||
371 | /* | |
372 | * Add retry mecanism | |
373 | * Operation on I2C interface may fail in case of operation on | |
374 | * RF or SWP interface | |
375 | */ | |
376 | r = 0; | |
a3c5d8fb | 377 | mutex_lock(&phy->phy_lock); |
68957303 | 378 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) { |
c97ffdbf | 379 | r = i2c_master_recv(client, buf, len); |
68957303 CR |
380 | if (r < 0) |
381 | msleep(wait_tab[i]); | |
382 | } | |
a3c5d8fb | 383 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
384 | |
385 | if (r != len) { | |
386 | phy->current_read_len = 0; | |
387 | return -EREMOTEIO; | |
388 | } | |
389 | ||
c97ffdbf CR |
390 | /* |
391 | * The first read sequence does not start with SOF. | |
392 | * Data is corrupeted so we drop it. | |
393 | */ | |
8e9466cc | 394 | if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
395 | skb_trim(skb, 0); |
396 | phy->current_read_len = 0; | |
397 | return -EIO; | |
8e9466cc | 398 | } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
399 | /* |
400 | * Previous frame transmission was interrupted and | |
401 | * the frame got repeated. | |
402 | * Received frame start with ST21NFCA_SOF_EOF + 00. | |
403 | */ | |
404 | skb_trim(skb, 0); | |
405 | phy->current_read_len = 0; | |
406 | } | |
407 | ||
59ae1d12 | 408 | skb_put_data(skb, buf, len); |
c97ffdbf CR |
409 | |
410 | if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) { | |
68957303 CR |
411 | phy->current_read_len = 0; |
412 | return st21nfca_hci_i2c_repack(skb); | |
413 | } | |
414 | phy->current_read_len++; | |
415 | return -EAGAIN; | |
416 | } | |
417 | return -EIO; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Reads an shdlc frame from the chip. This is not as straightforward as it | |
422 | * seems. The frame format is data-crc, and corruption can occur anywhere | |
423 | * while transiting on i2c bus, such that we could read an invalid data. | |
424 | * The tricky case is when we read a corrupted data or crc. We must detect | |
425 | * this here in order to determine that data can be transmitted to the hci | |
426 | * core. This is the reason why we check the crc here. | |
427 | * The CLF will repeat a frame until we send a RR on that frame. | |
428 | * | |
429 | * On ST21NFCA, IRQ goes in idle when read starts. As no size information are | |
430 | * available in the incoming data, other IRQ might come. Every IRQ will trigger | |
431 | * a read sequence with different length and will fill the current frame. | |
432 | * The reception is complete once we reach a ST21NFCA_SOF_EOF. | |
433 | */ | |
434 | static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id) | |
435 | { | |
436 | struct st21nfca_i2c_phy *phy = phy_id; | |
437 | struct i2c_client *client; | |
438 | ||
439 | int r; | |
440 | ||
441 | if (!phy || irq != phy->i2c_dev->irq) { | |
442 | WARN_ON_ONCE(1); | |
443 | return IRQ_NONE; | |
444 | } | |
445 | ||
446 | client = phy->i2c_dev; | |
447 | dev_dbg(&client->dev, "IRQ\n"); | |
448 | ||
449 | if (phy->hard_fault != 0) | |
450 | return IRQ_HANDLED; | |
451 | ||
452 | r = st21nfca_hci_i2c_read(phy, phy->pending_skb); | |
453 | if (r == -EREMOTEIO) { | |
454 | phy->hard_fault = r; | |
455 | ||
456 | nfc_hci_recv_frame(phy->hdev, NULL); | |
457 | ||
458 | return IRQ_HANDLED; | |
459 | } else if (r == -EAGAIN || r == -EIO) { | |
460 | return IRQ_HANDLED; | |
461 | } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) { | |
462 | /* | |
463 | * With ST21NFCA, only one interface (I2C, RF or SWP) | |
464 | * may be active at a time. | |
465 | * Having incorrect crc is usually due to i2c macrocell | |
466 | * deactivation in the middle of a transmission. | |
467 | * It may generate corrupted data on i2c. | |
468 | * We give sometime to get i2c back. | |
469 | * The complete frame will be repeated. | |
470 | */ | |
471 | msleep(wait_tab[phy->crc_trials]); | |
472 | phy->crc_trials++; | |
473 | phy->current_read_len = 0; | |
0c942b00 | 474 | kfree_skb(phy->pending_skb); |
68957303 CR |
475 | } else if (r > 0) { |
476 | /* | |
477 | * We succeeded to read data from the CLF and | |
478 | * data is valid. | |
479 | * Reset counter. | |
480 | */ | |
481 | nfc_hci_recv_frame(phy->hdev, phy->pending_skb); | |
482 | phy->crc_trials = 0; | |
cf577344 CR |
483 | } else { |
484 | kfree_skb(phy->pending_skb); | |
68957303 CR |
485 | } |
486 | ||
487 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); | |
488 | if (phy->pending_skb == NULL) { | |
489 | phy->hard_fault = -ENOMEM; | |
490 | nfc_hci_recv_frame(phy->hdev, NULL); | |
491 | } | |
492 | ||
493 | return IRQ_HANDLED; | |
494 | } | |
495 | ||
496 | static struct nfc_phy_ops i2c_phy_ops = { | |
497 | .write = st21nfca_hci_i2c_write, | |
498 | .enable = st21nfca_hci_i2c_enable, | |
499 | .disable = st21nfca_hci_i2c_disable, | |
500 | }; | |
501 | ||
394671e7 AS |
502 | static const struct acpi_gpio_params enable_gpios = { 1, 0, false }; |
503 | ||
504 | static const struct acpi_gpio_mapping acpi_st21nfca_gpios[] = { | |
505 | { "enable-gpios", &enable_gpios, 1 }, | |
506 | {}, | |
507 | }; | |
508 | ||
68957303 CR |
509 | static int st21nfca_hci_i2c_probe(struct i2c_client *client, |
510 | const struct i2c_device_id *id) | |
511 | { | |
d31748be | 512 | struct device *dev = &client->dev; |
68957303 | 513 | struct st21nfca_i2c_phy *phy; |
fcb45e6a | 514 | int r; |
68957303 CR |
515 | |
516 | dev_dbg(&client->dev, "%s\n", __func__); | |
517 | dev_dbg(&client->dev, "IRQ: %d\n", client->irq); | |
518 | ||
519 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
520 | nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); | |
521 | return -ENODEV; | |
522 | } | |
523 | ||
524 | phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy), | |
525 | GFP_KERNEL); | |
2b702832 | 526 | if (!phy) |
68957303 | 527 | return -ENOMEM; |
68957303 CR |
528 | |
529 | phy->i2c_dev = client; | |
fcb45e6a CR |
530 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); |
531 | if (phy->pending_skb == NULL) | |
532 | return -ENOMEM; | |
68957303 | 533 | |
fcb45e6a CR |
534 | phy->current_read_len = 0; |
535 | phy->crc_trials = 0; | |
a3c5d8fb | 536 | mutex_init(&phy->phy_lock); |
68957303 CR |
537 | i2c_set_clientdata(client, phy); |
538 | ||
d31748be AS |
539 | r = devm_acpi_dev_add_driver_gpios(dev, acpi_st21nfca_gpios); |
540 | if (r) | |
541 | dev_dbg(dev, "Unable to add GPIO mapping table\n"); | |
542 | ||
543 | /* Get EN GPIO from resource provider */ | |
544 | phy->gpiod_ena = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); | |
545 | if (IS_ERR(phy->gpiod_ena)) { | |
546 | nfc_err(dev, "Unable to get ENABLE GPIO\n"); | |
547 | return PTR_ERR(phy->gpiod_ena); | |
fcb45e6a | 548 | } |
fcb45e6a | 549 | |
682fd618 AS |
550 | phy->se_status.is_ese_present = |
551 | device_property_read_bool(&client->dev, "ese-present"); | |
552 | phy->se_status.is_uicc_present = | |
553 | device_property_read_bool(&client->dev, "uicc-present"); | |
554 | ||
18d2c624 CR |
555 | r = st21nfca_hci_platform_init(phy); |
556 | if (r < 0) { | |
557 | nfc_err(&client->dev, "Unable to reboot st21nfca\n"); | |
67df3f95 | 558 | return r; |
18d2c624 CR |
559 | } |
560 | ||
68957303 CR |
561 | r = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
562 | st21nfca_hci_irq_thread_fn, | |
8e7836d0 | 563 | IRQF_ONESHOT, |
68957303 CR |
564 | ST21NFCA_HCI_DRIVER_NAME, phy); |
565 | if (r < 0) { | |
566 | nfc_err(&client->dev, "Unable to register IRQ handler\n"); | |
567 | return r; | |
568 | } | |
569 | ||
9bac75d0 | 570 | return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME, |
2130fb97 CR |
571 | ST21NFCA_FRAME_HEADROOM, |
572 | ST21NFCA_FRAME_TAILROOM, | |
573 | ST21NFCA_HCI_LLC_MAX_PAYLOAD, | |
574 | &phy->hdev, | |
575 | &phy->se_status); | |
68957303 CR |
576 | } |
577 | ||
578 | static int st21nfca_hci_i2c_remove(struct i2c_client *client) | |
579 | { | |
580 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); | |
581 | ||
582 | dev_dbg(&client->dev, "%s\n", __func__); | |
583 | ||
584 | st21nfca_hci_remove(phy->hdev); | |
585 | ||
586 | if (phy->powered) | |
587 | st21nfca_hci_i2c_disable(phy); | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
39db2d21 CR |
592 | static struct i2c_device_id st21nfca_hci_i2c_id_table[] = { |
593 | {ST21NFCA_HCI_DRIVER_NAME, 0}, | |
594 | {} | |
595 | }; | |
596 | MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table); | |
597 | ||
dfa8070d CR |
598 | static const struct acpi_device_id st21nfca_hci_i2c_acpi_match[] = { |
599 | {"SMO2100", 0}, | |
600 | {} | |
601 | }; | |
602 | MODULE_DEVICE_TABLE(acpi, st21nfca_hci_i2c_acpi_match); | |
603 | ||
c44cb2ed | 604 | static const struct of_device_id of_st21nfca_i2c_match[] = { |
6b5fba4e | 605 | { .compatible = "st,st21nfca-i2c", }, |
c44cb2ed CR |
606 | { .compatible = "st,st21nfca_i2c", }, |
607 | {} | |
608 | }; | |
17e40107 | 609 | MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match); |
c44cb2ed | 610 | |
68957303 CR |
611 | static struct i2c_driver st21nfca_hci_i2c_driver = { |
612 | .driver = { | |
fcb45e6a | 613 | .name = ST21NFCA_HCI_I2C_DRIVER_NAME, |
c44cb2ed | 614 | .of_match_table = of_match_ptr(of_st21nfca_i2c_match), |
dfa8070d | 615 | .acpi_match_table = ACPI_PTR(st21nfca_hci_i2c_acpi_match), |
fcb45e6a | 616 | }, |
68957303 CR |
617 | .probe = st21nfca_hci_i2c_probe, |
618 | .id_table = st21nfca_hci_i2c_id_table, | |
619 | .remove = st21nfca_hci_i2c_remove, | |
620 | }; | |
68957303 CR |
621 | module_i2c_driver(st21nfca_hci_i2c_driver); |
622 | ||
623 | MODULE_LICENSE("GPL"); | |
624 | MODULE_DESCRIPTION(DRIVER_DESC); |