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46fe7771 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
68957303 CR |
2 | /* |
3 | * I2C Link Layer for ST21NFCA HCI based Driver | |
4 | * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved. | |
68957303 CR |
5 | */ |
6 | ||
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
8 | ||
9 | #include <linux/crc-ccitt.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/i2c.h> | |
dfa8070d | 12 | #include <linux/gpio/consumer.h> |
c44cb2ed CR |
13 | #include <linux/of_irq.h> |
14 | #include <linux/of_gpio.h> | |
dfa8070d | 15 | #include <linux/acpi.h> |
68957303 CR |
16 | #include <linux/interrupt.h> |
17 | #include <linux/delay.h> | |
18 | #include <linux/nfc.h> | |
19 | #include <linux/firmware.h> | |
79557b33 | 20 | |
db083bcb | 21 | #include <asm/unaligned.h> |
68957303 CR |
22 | |
23 | #include <net/nfc/hci.h> | |
24 | #include <net/nfc/llc.h> | |
25 | #include <net/nfc/nfc.h> | |
26 | ||
27 | #include "st21nfca.h" | |
28 | ||
29 | /* | |
30 | * Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF. | |
31 | * Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism | |
32 | * called byte stuffing has been introduced. | |
33 | * | |
34 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
35 | * - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
36 | * - xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
37 | */ | |
38 | #define ST21NFCA_SOF_EOF 0x7e | |
39 | #define ST21NFCA_BYTE_STUFFING_MASK 0x20 | |
40 | #define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d | |
41 | ||
e1fb97b9 | 42 | /* SOF + 00 */ |
68957303 CR |
43 | #define ST21NFCA_FRAME_HEADROOM 2 |
44 | ||
e1fb97b9 CR |
45 | /* 2 bytes crc + EOF */ |
46 | #define ST21NFCA_FRAME_TAILROOM 3 | |
c97ffdbf CR |
47 | #define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \ |
48 | buf[1] == 0) | |
68957303 | 49 | |
79557b33 | 50 | #define ST21NFCA_HCI_DRIVER_NAME "st21nfca_hci" |
68957303 CR |
51 | #define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c" |
52 | ||
68957303 CR |
53 | struct st21nfca_i2c_phy { |
54 | struct i2c_client *i2c_dev; | |
55 | struct nfc_hci_dev *hdev; | |
56 | ||
8d3c50e2 | 57 | struct gpio_desc *gpiod_ena; |
2130fb97 CR |
58 | struct st21nfca_se_status se_status; |
59 | ||
68957303 CR |
60 | struct sk_buff *pending_skb; |
61 | int current_read_len; | |
62 | /* | |
63 | * crc might have fail because i2c macro | |
64 | * is disable due to other interface activity | |
65 | */ | |
66 | int crc_trials; | |
67 | ||
68 | int powered; | |
69 | int run_mode; | |
70 | ||
71 | /* | |
72 | * < 0 if hardware error occured (e.g. i2c err) | |
73 | * and prevents normal operation. | |
74 | */ | |
75 | int hard_fault; | |
a3c5d8fb | 76 | struct mutex phy_lock; |
68957303 | 77 | }; |
57dc828a | 78 | |
0531107e | 79 | static u8 len_seq[] = { 16, 24, 12, 29 }; |
68957303 CR |
80 | static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40}; |
81 | ||
82 | #define I2C_DUMP_SKB(info, skb) \ | |
83 | do { \ | |
84 | pr_debug("%s:\n", info); \ | |
85 | print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \ | |
86 | 16, 1, (skb)->data, (skb)->len, 0); \ | |
87 | } while (0) | |
88 | ||
18d2c624 CR |
89 | /* |
90 | * In order to get the CLF in a known state we generate an internal reboot | |
91 | * using a proprietary command. | |
92 | * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF | |
93 | * fill buffer. | |
94 | */ | |
95 | static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy) | |
68957303 | 96 | { |
c5b0c370 | 97 | u16 wait_reboot[] = { 50, 300, 1000 }; |
68957303 CR |
98 | char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E }; |
99 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE]; | |
100 | int i, r = -1; | |
101 | ||
18d2c624 CR |
102 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { |
103 | r = i2c_master_send(phy->i2c_dev, reboot_cmd, | |
104 | sizeof(reboot_cmd)); | |
105 | if (r < 0) | |
106 | msleep(wait_reboot[i]); | |
107 | } | |
108 | if (r < 0) | |
109 | return r; | |
110 | ||
111 | /* CLF is spending about 20ms to do an internal reboot */ | |
112 | msleep(20); | |
113 | r = -1; | |
114 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { | |
68957303 CR |
115 | r = i2c_master_recv(phy->i2c_dev, tmp, |
116 | ST21NFCA_HCI_LLC_MAX_SIZE); | |
18d2c624 CR |
117 | if (r < 0) |
118 | msleep(wait_reboot[i]); | |
119 | } | |
120 | if (r < 0) | |
121 | return r; | |
68957303 | 122 | |
18d2c624 CR |
123 | for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE && |
124 | tmp[i] == ST21NFCA_SOF_EOF; i++) | |
125 | ; | |
126 | ||
127 | if (r != ST21NFCA_HCI_LLC_MAX_SIZE) | |
128 | return -ENODEV; | |
68957303 | 129 | |
18d2c624 CR |
130 | usleep_range(1000, 1500); |
131 | return 0; | |
68957303 CR |
132 | } |
133 | ||
134 | static int st21nfca_hci_i2c_enable(void *phy_id) | |
135 | { | |
136 | struct st21nfca_i2c_phy *phy = phy_id; | |
137 | ||
8d3c50e2 | 138 | gpiod_set_value(phy->gpiod_ena, 1); |
68957303 CR |
139 | phy->powered = 1; |
140 | phy->run_mode = ST21NFCA_HCI_MODE; | |
141 | ||
142 | usleep_range(10000, 15000); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static void st21nfca_hci_i2c_disable(void *phy_id) | |
148 | { | |
149 | struct st21nfca_i2c_phy *phy = phy_id; | |
150 | ||
8d3c50e2 | 151 | gpiod_set_value(phy->gpiod_ena, 0); |
68957303 CR |
152 | |
153 | phy->powered = 0; | |
154 | } | |
155 | ||
e1fb97b9 | 156 | static void st21nfca_hci_add_len_crc(struct sk_buff *skb) |
68957303 | 157 | { |
68957303 CR |
158 | u16 crc; |
159 | u8 tmp; | |
160 | ||
d58ff351 | 161 | *(u8 *)skb_push(skb, 1) = 0; |
68957303 CR |
162 | |
163 | crc = crc_ccitt(0xffff, skb->data, skb->len); | |
164 | crc = ~crc; | |
165 | ||
166 | tmp = crc & 0x00ff; | |
634fef61 | 167 | skb_put_u8(skb, tmp); |
68957303 CR |
168 | |
169 | tmp = (crc >> 8) & 0x00ff; | |
634fef61 | 170 | skb_put_u8(skb, tmp); |
68957303 CR |
171 | } |
172 | ||
e1fb97b9 | 173 | static void st21nfca_hci_remove_len_crc(struct sk_buff *skb) |
68957303 CR |
174 | { |
175 | skb_pull(skb, ST21NFCA_FRAME_HEADROOM); | |
e1fb97b9 | 176 | skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM); |
68957303 CR |
177 | } |
178 | ||
179 | /* | |
180 | * Writing a frame must not return the number of written bytes. | |
181 | * It must return either zero for success, or <0 for error. | |
182 | * In addition, it must not alter the skb | |
183 | */ | |
184 | static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb) | |
185 | { | |
e1fb97b9 | 186 | int r = -1, i, j; |
68957303 CR |
187 | struct st21nfca_i2c_phy *phy = phy_id; |
188 | struct i2c_client *client = phy->i2c_dev; | |
68957303 CR |
189 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2]; |
190 | ||
191 | I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb); | |
192 | ||
68957303 CR |
193 | if (phy->hard_fault != 0) |
194 | return phy->hard_fault; | |
195 | ||
196 | /* | |
197 | * Compute CRC before byte stuffing computation on frame | |
198 | * Note st21nfca_hci_add_len_crc is doing a byte stuffing | |
199 | * on its own value | |
200 | */ | |
e1fb97b9 | 201 | st21nfca_hci_add_len_crc(skb); |
68957303 CR |
202 | |
203 | /* add ST21NFCA_SOF_EOF on tail */ | |
634fef61 | 204 | skb_put_u8(skb, ST21NFCA_SOF_EOF); |
68957303 | 205 | /* add ST21NFCA_SOF_EOF on head */ |
d58ff351 | 206 | *(u8 *)skb_push(skb, 1) = ST21NFCA_SOF_EOF; |
68957303 CR |
207 | |
208 | /* | |
209 | * Compute byte stuffing | |
210 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
211 | * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
212 | * xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
213 | */ | |
214 | tmp[0] = skb->data[0]; | |
215 | for (i = 1, j = 1; i < skb->len - 1; i++, j++) { | |
216 | if (skb->data[i] == ST21NFCA_SOF_EOF | |
217 | || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) { | |
218 | tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING; | |
219 | j++; | |
220 | tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK; | |
221 | } else { | |
222 | tmp[j] = skb->data[i]; | |
223 | } | |
224 | } | |
225 | tmp[j] = skb->data[i]; | |
226 | j++; | |
227 | ||
228 | /* | |
229 | * Manage sleep mode | |
230 | * Try 3 times to send data with delay between each | |
231 | */ | |
a3c5d8fb | 232 | mutex_lock(&phy->phy_lock); |
68957303 CR |
233 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) { |
234 | r = i2c_master_send(client, tmp, j); | |
235 | if (r < 0) | |
236 | msleep(wait_tab[i]); | |
237 | } | |
a3c5d8fb | 238 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
239 | |
240 | if (r >= 0) { | |
241 | if (r != j) | |
242 | r = -EREMOTEIO; | |
243 | else | |
244 | r = 0; | |
245 | } | |
246 | ||
e1fb97b9 | 247 | st21nfca_hci_remove_len_crc(skb); |
68957303 CR |
248 | |
249 | return r; | |
250 | } | |
251 | ||
252 | static int get_frame_size(u8 *buf, int buflen) | |
253 | { | |
254 | int len = 0; | |
3e6df919 | 255 | |
68957303 CR |
256 | if (buf[len + 1] == ST21NFCA_SOF_EOF) |
257 | return 0; | |
258 | ||
259 | for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++) | |
260 | ; | |
261 | ||
262 | return len; | |
263 | } | |
264 | ||
265 | static int check_crc(u8 *buf, int buflen) | |
266 | { | |
267 | u16 crc; | |
268 | ||
269 | crc = crc_ccitt(0xffff, buf, buflen - 2); | |
270 | crc = ~crc; | |
271 | ||
272 | if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) { | |
273 | pr_err(ST21NFCA_HCI_DRIVER_NAME | |
274 | ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1], | |
275 | buf[buflen - 2]); | |
276 | ||
277 | pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__); | |
278 | print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, | |
279 | 16, 2, buf, buflen, false); | |
280 | return -EPERM; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Prepare received data for upper layer. | |
287 | * Received data include byte stuffing, crc and sof/eof | |
288 | * which is not usable by hci part. | |
289 | * returns: | |
290 | * frame size without sof/eof, header and byte stuffing | |
291 | * -EBADMSG : frame was incorrect and discarded | |
292 | */ | |
293 | static int st21nfca_hci_i2c_repack(struct sk_buff *skb) | |
294 | { | |
295 | int i, j, r, size; | |
3e6df919 | 296 | |
68957303 CR |
297 | if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0)) |
298 | return -EBADMSG; | |
299 | ||
300 | size = get_frame_size(skb->data, skb->len); | |
301 | if (size > 0) { | |
302 | skb_trim(skb, size); | |
303 | /* remove ST21NFCA byte stuffing for upper layer */ | |
304 | for (i = 1, j = 0; i < skb->len; i++) { | |
3096e25a | 305 | if (skb->data[i + j] == |
68957303 | 306 | (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) { |
3096e25a CR |
307 | skb->data[i] = skb->data[i + j + 1] |
308 | | ST21NFCA_BYTE_STUFFING_MASK; | |
68957303 CR |
309 | i++; |
310 | j++; | |
311 | } | |
312 | skb->data[i] = skb->data[i + j]; | |
313 | } | |
314 | /* remove byte stuffing useless byte */ | |
315 | skb_trim(skb, i - j); | |
316 | /* remove ST21NFCA_SOF_EOF from head */ | |
317 | skb_pull(skb, 1); | |
318 | ||
319 | r = check_crc(skb->data, skb->len); | |
320 | if (r != 0) { | |
321 | i = 0; | |
322 | return -EBADMSG; | |
323 | } | |
324 | ||
325 | /* remove headbyte */ | |
326 | skb_pull(skb, 1); | |
327 | /* remove crc. Byte Stuffing is already removed here */ | |
328 | skb_trim(skb, skb->len - 2); | |
329 | return skb->len; | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees | |
336 | * that i2c bus will be flushed and that next read will start on a new frame. | |
337 | * returned skb contains only LLC header and payload. | |
338 | * returns: | |
339 | * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at | |
340 | * end of read) | |
341 | * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF | |
342 | * at end of read) | |
343 | * -EREMOTEIO : i2c read error (fatal) | |
344 | * -EBADMSG : frame was incorrect and discarded | |
345 | * (value returned from st21nfca_hci_i2c_repack) | |
346 | * -EIO : if no ST21NFCA_SOF_EOF is found after reaching | |
347 | * the read length end sequence | |
348 | */ | |
349 | static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy, | |
350 | struct sk_buff *skb) | |
351 | { | |
352 | int r, i; | |
353 | u8 len; | |
c97ffdbf | 354 | u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD]; |
68957303 CR |
355 | struct i2c_client *client = phy->i2c_dev; |
356 | ||
357 | if (phy->current_read_len < ARRAY_SIZE(len_seq)) { | |
358 | len = len_seq[phy->current_read_len]; | |
359 | ||
360 | /* | |
361 | * Add retry mecanism | |
362 | * Operation on I2C interface may fail in case of operation on | |
363 | * RF or SWP interface | |
364 | */ | |
365 | r = 0; | |
a3c5d8fb | 366 | mutex_lock(&phy->phy_lock); |
68957303 | 367 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) { |
c97ffdbf | 368 | r = i2c_master_recv(client, buf, len); |
68957303 CR |
369 | if (r < 0) |
370 | msleep(wait_tab[i]); | |
371 | } | |
a3c5d8fb | 372 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
373 | |
374 | if (r != len) { | |
375 | phy->current_read_len = 0; | |
376 | return -EREMOTEIO; | |
377 | } | |
378 | ||
c97ffdbf CR |
379 | /* |
380 | * The first read sequence does not start with SOF. | |
381 | * Data is corrupeted so we drop it. | |
382 | */ | |
8e9466cc | 383 | if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
384 | skb_trim(skb, 0); |
385 | phy->current_read_len = 0; | |
386 | return -EIO; | |
8e9466cc | 387 | } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
388 | /* |
389 | * Previous frame transmission was interrupted and | |
390 | * the frame got repeated. | |
391 | * Received frame start with ST21NFCA_SOF_EOF + 00. | |
392 | */ | |
393 | skb_trim(skb, 0); | |
394 | phy->current_read_len = 0; | |
395 | } | |
396 | ||
59ae1d12 | 397 | skb_put_data(skb, buf, len); |
c97ffdbf CR |
398 | |
399 | if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) { | |
68957303 CR |
400 | phy->current_read_len = 0; |
401 | return st21nfca_hci_i2c_repack(skb); | |
402 | } | |
403 | phy->current_read_len++; | |
404 | return -EAGAIN; | |
405 | } | |
406 | return -EIO; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Reads an shdlc frame from the chip. This is not as straightforward as it | |
411 | * seems. The frame format is data-crc, and corruption can occur anywhere | |
412 | * while transiting on i2c bus, such that we could read an invalid data. | |
413 | * The tricky case is when we read a corrupted data or crc. We must detect | |
414 | * this here in order to determine that data can be transmitted to the hci | |
415 | * core. This is the reason why we check the crc here. | |
416 | * The CLF will repeat a frame until we send a RR on that frame. | |
417 | * | |
418 | * On ST21NFCA, IRQ goes in idle when read starts. As no size information are | |
419 | * available in the incoming data, other IRQ might come. Every IRQ will trigger | |
420 | * a read sequence with different length and will fill the current frame. | |
421 | * The reception is complete once we reach a ST21NFCA_SOF_EOF. | |
422 | */ | |
423 | static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id) | |
424 | { | |
425 | struct st21nfca_i2c_phy *phy = phy_id; | |
426 | struct i2c_client *client; | |
427 | ||
428 | int r; | |
429 | ||
430 | if (!phy || irq != phy->i2c_dev->irq) { | |
431 | WARN_ON_ONCE(1); | |
432 | return IRQ_NONE; | |
433 | } | |
434 | ||
435 | client = phy->i2c_dev; | |
436 | dev_dbg(&client->dev, "IRQ\n"); | |
437 | ||
438 | if (phy->hard_fault != 0) | |
439 | return IRQ_HANDLED; | |
440 | ||
441 | r = st21nfca_hci_i2c_read(phy, phy->pending_skb); | |
442 | if (r == -EREMOTEIO) { | |
443 | phy->hard_fault = r; | |
444 | ||
445 | nfc_hci_recv_frame(phy->hdev, NULL); | |
446 | ||
447 | return IRQ_HANDLED; | |
448 | } else if (r == -EAGAIN || r == -EIO) { | |
449 | return IRQ_HANDLED; | |
450 | } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) { | |
451 | /* | |
452 | * With ST21NFCA, only one interface (I2C, RF or SWP) | |
453 | * may be active at a time. | |
454 | * Having incorrect crc is usually due to i2c macrocell | |
455 | * deactivation in the middle of a transmission. | |
456 | * It may generate corrupted data on i2c. | |
457 | * We give sometime to get i2c back. | |
458 | * The complete frame will be repeated. | |
459 | */ | |
460 | msleep(wait_tab[phy->crc_trials]); | |
461 | phy->crc_trials++; | |
462 | phy->current_read_len = 0; | |
0c942b00 | 463 | kfree_skb(phy->pending_skb); |
68957303 CR |
464 | } else if (r > 0) { |
465 | /* | |
466 | * We succeeded to read data from the CLF and | |
467 | * data is valid. | |
468 | * Reset counter. | |
469 | */ | |
470 | nfc_hci_recv_frame(phy->hdev, phy->pending_skb); | |
471 | phy->crc_trials = 0; | |
cf577344 CR |
472 | } else { |
473 | kfree_skb(phy->pending_skb); | |
68957303 CR |
474 | } |
475 | ||
476 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); | |
477 | if (phy->pending_skb == NULL) { | |
478 | phy->hard_fault = -ENOMEM; | |
479 | nfc_hci_recv_frame(phy->hdev, NULL); | |
480 | } | |
481 | ||
482 | return IRQ_HANDLED; | |
483 | } | |
484 | ||
485 | static struct nfc_phy_ops i2c_phy_ops = { | |
486 | .write = st21nfca_hci_i2c_write, | |
487 | .enable = st21nfca_hci_i2c_enable, | |
488 | .disable = st21nfca_hci_i2c_disable, | |
489 | }; | |
490 | ||
394671e7 AS |
491 | static const struct acpi_gpio_params enable_gpios = { 1, 0, false }; |
492 | ||
493 | static const struct acpi_gpio_mapping acpi_st21nfca_gpios[] = { | |
494 | { "enable-gpios", &enable_gpios, 1 }, | |
495 | {}, | |
496 | }; | |
497 | ||
68957303 CR |
498 | static int st21nfca_hci_i2c_probe(struct i2c_client *client, |
499 | const struct i2c_device_id *id) | |
500 | { | |
d31748be | 501 | struct device *dev = &client->dev; |
68957303 | 502 | struct st21nfca_i2c_phy *phy; |
fcb45e6a | 503 | int r; |
68957303 CR |
504 | |
505 | dev_dbg(&client->dev, "%s\n", __func__); | |
506 | dev_dbg(&client->dev, "IRQ: %d\n", client->irq); | |
507 | ||
508 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
509 | nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); | |
510 | return -ENODEV; | |
511 | } | |
512 | ||
513 | phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy), | |
514 | GFP_KERNEL); | |
2b702832 | 515 | if (!phy) |
68957303 | 516 | return -ENOMEM; |
68957303 CR |
517 | |
518 | phy->i2c_dev = client; | |
fcb45e6a CR |
519 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); |
520 | if (phy->pending_skb == NULL) | |
521 | return -ENOMEM; | |
68957303 | 522 | |
fcb45e6a CR |
523 | phy->current_read_len = 0; |
524 | phy->crc_trials = 0; | |
a3c5d8fb | 525 | mutex_init(&phy->phy_lock); |
68957303 CR |
526 | i2c_set_clientdata(client, phy); |
527 | ||
d31748be AS |
528 | r = devm_acpi_dev_add_driver_gpios(dev, acpi_st21nfca_gpios); |
529 | if (r) | |
530 | dev_dbg(dev, "Unable to add GPIO mapping table\n"); | |
531 | ||
532 | /* Get EN GPIO from resource provider */ | |
533 | phy->gpiod_ena = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); | |
534 | if (IS_ERR(phy->gpiod_ena)) { | |
535 | nfc_err(dev, "Unable to get ENABLE GPIO\n"); | |
536 | return PTR_ERR(phy->gpiod_ena); | |
fcb45e6a | 537 | } |
fcb45e6a | 538 | |
682fd618 AS |
539 | phy->se_status.is_ese_present = |
540 | device_property_read_bool(&client->dev, "ese-present"); | |
541 | phy->se_status.is_uicc_present = | |
542 | device_property_read_bool(&client->dev, "uicc-present"); | |
543 | ||
18d2c624 CR |
544 | r = st21nfca_hci_platform_init(phy); |
545 | if (r < 0) { | |
546 | nfc_err(&client->dev, "Unable to reboot st21nfca\n"); | |
67df3f95 | 547 | return r; |
18d2c624 CR |
548 | } |
549 | ||
68957303 CR |
550 | r = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
551 | st21nfca_hci_irq_thread_fn, | |
8e7836d0 | 552 | IRQF_ONESHOT, |
68957303 CR |
553 | ST21NFCA_HCI_DRIVER_NAME, phy); |
554 | if (r < 0) { | |
555 | nfc_err(&client->dev, "Unable to register IRQ handler\n"); | |
556 | return r; | |
557 | } | |
558 | ||
9bac75d0 | 559 | return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME, |
2130fb97 CR |
560 | ST21NFCA_FRAME_HEADROOM, |
561 | ST21NFCA_FRAME_TAILROOM, | |
562 | ST21NFCA_HCI_LLC_MAX_PAYLOAD, | |
563 | &phy->hdev, | |
564 | &phy->se_status); | |
68957303 CR |
565 | } |
566 | ||
567 | static int st21nfca_hci_i2c_remove(struct i2c_client *client) | |
568 | { | |
569 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); | |
570 | ||
571 | dev_dbg(&client->dev, "%s\n", __func__); | |
572 | ||
573 | st21nfca_hci_remove(phy->hdev); | |
574 | ||
575 | if (phy->powered) | |
576 | st21nfca_hci_i2c_disable(phy); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
a122ffd0 | 581 | static const struct i2c_device_id st21nfca_hci_i2c_id_table[] = { |
39db2d21 CR |
582 | {ST21NFCA_HCI_DRIVER_NAME, 0}, |
583 | {} | |
584 | }; | |
585 | MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table); | |
586 | ||
dfa8070d CR |
587 | static const struct acpi_device_id st21nfca_hci_i2c_acpi_match[] = { |
588 | {"SMO2100", 0}, | |
589 | {} | |
590 | }; | |
591 | MODULE_DEVICE_TABLE(acpi, st21nfca_hci_i2c_acpi_match); | |
592 | ||
c44cb2ed | 593 | static const struct of_device_id of_st21nfca_i2c_match[] = { |
6b5fba4e | 594 | { .compatible = "st,st21nfca-i2c", }, |
c44cb2ed CR |
595 | { .compatible = "st,st21nfca_i2c", }, |
596 | {} | |
597 | }; | |
17e40107 | 598 | MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match); |
c44cb2ed | 599 | |
68957303 CR |
600 | static struct i2c_driver st21nfca_hci_i2c_driver = { |
601 | .driver = { | |
fcb45e6a | 602 | .name = ST21NFCA_HCI_I2C_DRIVER_NAME, |
c44cb2ed | 603 | .of_match_table = of_match_ptr(of_st21nfca_i2c_match), |
dfa8070d | 604 | .acpi_match_table = ACPI_PTR(st21nfca_hci_i2c_acpi_match), |
fcb45e6a | 605 | }, |
68957303 CR |
606 | .probe = st21nfca_hci_i2c_probe, |
607 | .id_table = st21nfca_hci_i2c_id_table, | |
608 | .remove = st21nfca_hci_i2c_remove, | |
609 | }; | |
68957303 CR |
610 | module_i2c_driver(st21nfca_hci_i2c_driver); |
611 | ||
612 | MODULE_LICENSE("GPL"); | |
613 | MODULE_DESCRIPTION(DRIVER_DESC); |