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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> | |
23 | #include <linux/gpio.h> | |
dfa8070d | 24 | #include <linux/gpio/consumer.h> |
c44cb2ed CR |
25 | #include <linux/of_irq.h> |
26 | #include <linux/of_gpio.h> | |
dfa8070d | 27 | #include <linux/acpi.h> |
68957303 CR |
28 | #include <linux/miscdevice.h> |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/nfc.h> | |
32 | #include <linux/firmware.h> | |
68957303 | 33 | #include <linux/platform_data/st21nfca.h> |
db083bcb | 34 | #include <asm/unaligned.h> |
68957303 CR |
35 | |
36 | #include <net/nfc/hci.h> | |
37 | #include <net/nfc/llc.h> | |
38 | #include <net/nfc/nfc.h> | |
39 | ||
40 | #include "st21nfca.h" | |
41 | ||
42 | /* | |
43 | * Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF. | |
44 | * Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism | |
45 | * called byte stuffing has been introduced. | |
46 | * | |
47 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
48 | * - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
49 | * - xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
50 | */ | |
51 | #define ST21NFCA_SOF_EOF 0x7e | |
52 | #define ST21NFCA_BYTE_STUFFING_MASK 0x20 | |
53 | #define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d | |
54 | ||
e1fb97b9 | 55 | /* SOF + 00 */ |
68957303 CR |
56 | #define ST21NFCA_FRAME_HEADROOM 2 |
57 | ||
e1fb97b9 CR |
58 | /* 2 bytes crc + EOF */ |
59 | #define ST21NFCA_FRAME_TAILROOM 3 | |
c97ffdbf CR |
60 | #define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \ |
61 | buf[1] == 0) | |
68957303 CR |
62 | |
63 | #define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c" | |
64 | ||
2a196975 | 65 | #define ST21NFCA_GPIO_NAME_EN "enable" |
04e99b71 | 66 | |
68957303 CR |
67 | struct st21nfca_i2c_phy { |
68 | struct i2c_client *i2c_dev; | |
69 | struct nfc_hci_dev *hdev; | |
70 | ||
71 | unsigned int gpio_ena; | |
68957303 CR |
72 | unsigned int irq_polarity; |
73 | ||
2130fb97 CR |
74 | struct st21nfca_se_status se_status; |
75 | ||
68957303 CR |
76 | struct sk_buff *pending_skb; |
77 | int current_read_len; | |
78 | /* | |
79 | * crc might have fail because i2c macro | |
80 | * is disable due to other interface activity | |
81 | */ | |
82 | int crc_trials; | |
83 | ||
84 | int powered; | |
85 | int run_mode; | |
86 | ||
87 | /* | |
88 | * < 0 if hardware error occured (e.g. i2c err) | |
89 | * and prevents normal operation. | |
90 | */ | |
91 | int hard_fault; | |
a3c5d8fb | 92 | struct mutex phy_lock; |
68957303 | 93 | }; |
57dc828a | 94 | |
0531107e | 95 | static u8 len_seq[] = { 16, 24, 12, 29 }; |
68957303 CR |
96 | static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40}; |
97 | ||
98 | #define I2C_DUMP_SKB(info, skb) \ | |
99 | do { \ | |
100 | pr_debug("%s:\n", info); \ | |
101 | print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \ | |
102 | 16, 1, (skb)->data, (skb)->len, 0); \ | |
103 | } while (0) | |
104 | ||
18d2c624 CR |
105 | /* |
106 | * In order to get the CLF in a known state we generate an internal reboot | |
107 | * using a proprietary command. | |
108 | * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF | |
109 | * fill buffer. | |
110 | */ | |
111 | static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy) | |
68957303 | 112 | { |
c5b0c370 | 113 | u16 wait_reboot[] = { 50, 300, 1000 }; |
68957303 CR |
114 | char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E }; |
115 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE]; | |
116 | int i, r = -1; | |
117 | ||
18d2c624 CR |
118 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { |
119 | r = i2c_master_send(phy->i2c_dev, reboot_cmd, | |
120 | sizeof(reboot_cmd)); | |
121 | if (r < 0) | |
122 | msleep(wait_reboot[i]); | |
123 | } | |
124 | if (r < 0) | |
125 | return r; | |
126 | ||
127 | /* CLF is spending about 20ms to do an internal reboot */ | |
128 | msleep(20); | |
129 | r = -1; | |
130 | for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { | |
68957303 CR |
131 | r = i2c_master_recv(phy->i2c_dev, tmp, |
132 | ST21NFCA_HCI_LLC_MAX_SIZE); | |
18d2c624 CR |
133 | if (r < 0) |
134 | msleep(wait_reboot[i]); | |
135 | } | |
136 | if (r < 0) | |
137 | return r; | |
68957303 | 138 | |
18d2c624 CR |
139 | for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE && |
140 | tmp[i] == ST21NFCA_SOF_EOF; i++) | |
141 | ; | |
142 | ||
143 | if (r != ST21NFCA_HCI_LLC_MAX_SIZE) | |
144 | return -ENODEV; | |
68957303 | 145 | |
18d2c624 CR |
146 | usleep_range(1000, 1500); |
147 | return 0; | |
68957303 CR |
148 | } |
149 | ||
150 | static int st21nfca_hci_i2c_enable(void *phy_id) | |
151 | { | |
152 | struct st21nfca_i2c_phy *phy = phy_id; | |
153 | ||
154 | gpio_set_value(phy->gpio_ena, 1); | |
155 | phy->powered = 1; | |
156 | phy->run_mode = ST21NFCA_HCI_MODE; | |
157 | ||
158 | usleep_range(10000, 15000); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static void st21nfca_hci_i2c_disable(void *phy_id) | |
164 | { | |
165 | struct st21nfca_i2c_phy *phy = phy_id; | |
166 | ||
68957303 CR |
167 | gpio_set_value(phy->gpio_ena, 0); |
168 | ||
169 | phy->powered = 0; | |
170 | } | |
171 | ||
e1fb97b9 | 172 | static void st21nfca_hci_add_len_crc(struct sk_buff *skb) |
68957303 | 173 | { |
68957303 CR |
174 | u16 crc; |
175 | u8 tmp; | |
176 | ||
177 | *skb_push(skb, 1) = 0; | |
178 | ||
179 | crc = crc_ccitt(0xffff, skb->data, skb->len); | |
180 | crc = ~crc; | |
181 | ||
182 | tmp = crc & 0x00ff; | |
183 | *skb_put(skb, 1) = tmp; | |
184 | ||
185 | tmp = (crc >> 8) & 0x00ff; | |
186 | *skb_put(skb, 1) = tmp; | |
68957303 CR |
187 | } |
188 | ||
e1fb97b9 | 189 | static void st21nfca_hci_remove_len_crc(struct sk_buff *skb) |
68957303 CR |
190 | { |
191 | skb_pull(skb, ST21NFCA_FRAME_HEADROOM); | |
e1fb97b9 | 192 | skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM); |
68957303 CR |
193 | } |
194 | ||
195 | /* | |
196 | * Writing a frame must not return the number of written bytes. | |
197 | * It must return either zero for success, or <0 for error. | |
198 | * In addition, it must not alter the skb | |
199 | */ | |
200 | static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb) | |
201 | { | |
e1fb97b9 | 202 | int r = -1, i, j; |
68957303 CR |
203 | struct st21nfca_i2c_phy *phy = phy_id; |
204 | struct i2c_client *client = phy->i2c_dev; | |
68957303 CR |
205 | u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2]; |
206 | ||
207 | I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb); | |
208 | ||
68957303 CR |
209 | if (phy->hard_fault != 0) |
210 | return phy->hard_fault; | |
211 | ||
212 | /* | |
213 | * Compute CRC before byte stuffing computation on frame | |
214 | * Note st21nfca_hci_add_len_crc is doing a byte stuffing | |
215 | * on its own value | |
216 | */ | |
e1fb97b9 | 217 | st21nfca_hci_add_len_crc(skb); |
68957303 CR |
218 | |
219 | /* add ST21NFCA_SOF_EOF on tail */ | |
220 | *skb_put(skb, 1) = ST21NFCA_SOF_EOF; | |
221 | /* add ST21NFCA_SOF_EOF on head */ | |
222 | *skb_push(skb, 1) = ST21NFCA_SOF_EOF; | |
223 | ||
224 | /* | |
225 | * Compute byte stuffing | |
226 | * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING | |
227 | * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) | |
228 | * xor byte with ST21NFCA_BYTE_STUFFING_MASK | |
229 | */ | |
230 | tmp[0] = skb->data[0]; | |
231 | for (i = 1, j = 1; i < skb->len - 1; i++, j++) { | |
232 | if (skb->data[i] == ST21NFCA_SOF_EOF | |
233 | || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) { | |
234 | tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING; | |
235 | j++; | |
236 | tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK; | |
237 | } else { | |
238 | tmp[j] = skb->data[i]; | |
239 | } | |
240 | } | |
241 | tmp[j] = skb->data[i]; | |
242 | j++; | |
243 | ||
244 | /* | |
245 | * Manage sleep mode | |
246 | * Try 3 times to send data with delay between each | |
247 | */ | |
a3c5d8fb | 248 | mutex_lock(&phy->phy_lock); |
68957303 CR |
249 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) { |
250 | r = i2c_master_send(client, tmp, j); | |
251 | if (r < 0) | |
252 | msleep(wait_tab[i]); | |
253 | } | |
a3c5d8fb | 254 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
255 | |
256 | if (r >= 0) { | |
257 | if (r != j) | |
258 | r = -EREMOTEIO; | |
259 | else | |
260 | r = 0; | |
261 | } | |
262 | ||
e1fb97b9 | 263 | st21nfca_hci_remove_len_crc(skb); |
68957303 CR |
264 | |
265 | return r; | |
266 | } | |
267 | ||
268 | static int get_frame_size(u8 *buf, int buflen) | |
269 | { | |
270 | int len = 0; | |
3e6df919 | 271 | |
68957303 CR |
272 | if (buf[len + 1] == ST21NFCA_SOF_EOF) |
273 | return 0; | |
274 | ||
275 | for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++) | |
276 | ; | |
277 | ||
278 | return len; | |
279 | } | |
280 | ||
281 | static int check_crc(u8 *buf, int buflen) | |
282 | { | |
283 | u16 crc; | |
284 | ||
285 | crc = crc_ccitt(0xffff, buf, buflen - 2); | |
286 | crc = ~crc; | |
287 | ||
288 | if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) { | |
289 | pr_err(ST21NFCA_HCI_DRIVER_NAME | |
290 | ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1], | |
291 | buf[buflen - 2]); | |
292 | ||
293 | pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__); | |
294 | print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, | |
295 | 16, 2, buf, buflen, false); | |
296 | return -EPERM; | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Prepare received data for upper layer. | |
303 | * Received data include byte stuffing, crc and sof/eof | |
304 | * which is not usable by hci part. | |
305 | * returns: | |
306 | * frame size without sof/eof, header and byte stuffing | |
307 | * -EBADMSG : frame was incorrect and discarded | |
308 | */ | |
309 | static int st21nfca_hci_i2c_repack(struct sk_buff *skb) | |
310 | { | |
311 | int i, j, r, size; | |
3e6df919 | 312 | |
68957303 CR |
313 | if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0)) |
314 | return -EBADMSG; | |
315 | ||
316 | size = get_frame_size(skb->data, skb->len); | |
317 | if (size > 0) { | |
318 | skb_trim(skb, size); | |
319 | /* remove ST21NFCA byte stuffing for upper layer */ | |
320 | for (i = 1, j = 0; i < skb->len; i++) { | |
3096e25a | 321 | if (skb->data[i + j] == |
68957303 | 322 | (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) { |
3096e25a CR |
323 | skb->data[i] = skb->data[i + j + 1] |
324 | | ST21NFCA_BYTE_STUFFING_MASK; | |
68957303 CR |
325 | i++; |
326 | j++; | |
327 | } | |
328 | skb->data[i] = skb->data[i + j]; | |
329 | } | |
330 | /* remove byte stuffing useless byte */ | |
331 | skb_trim(skb, i - j); | |
332 | /* remove ST21NFCA_SOF_EOF from head */ | |
333 | skb_pull(skb, 1); | |
334 | ||
335 | r = check_crc(skb->data, skb->len); | |
336 | if (r != 0) { | |
337 | i = 0; | |
338 | return -EBADMSG; | |
339 | } | |
340 | ||
341 | /* remove headbyte */ | |
342 | skb_pull(skb, 1); | |
343 | /* remove crc. Byte Stuffing is already removed here */ | |
344 | skb_trim(skb, skb->len - 2); | |
345 | return skb->len; | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees | |
352 | * that i2c bus will be flushed and that next read will start on a new frame. | |
353 | * returned skb contains only LLC header and payload. | |
354 | * returns: | |
355 | * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at | |
356 | * end of read) | |
357 | * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF | |
358 | * at end of read) | |
359 | * -EREMOTEIO : i2c read error (fatal) | |
360 | * -EBADMSG : frame was incorrect and discarded | |
361 | * (value returned from st21nfca_hci_i2c_repack) | |
362 | * -EIO : if no ST21NFCA_SOF_EOF is found after reaching | |
363 | * the read length end sequence | |
364 | */ | |
365 | static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy, | |
366 | struct sk_buff *skb) | |
367 | { | |
368 | int r, i; | |
369 | u8 len; | |
c97ffdbf | 370 | u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD]; |
68957303 CR |
371 | struct i2c_client *client = phy->i2c_dev; |
372 | ||
373 | if (phy->current_read_len < ARRAY_SIZE(len_seq)) { | |
374 | len = len_seq[phy->current_read_len]; | |
375 | ||
376 | /* | |
377 | * Add retry mecanism | |
378 | * Operation on I2C interface may fail in case of operation on | |
379 | * RF or SWP interface | |
380 | */ | |
381 | r = 0; | |
a3c5d8fb | 382 | mutex_lock(&phy->phy_lock); |
68957303 | 383 | for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) { |
c97ffdbf | 384 | r = i2c_master_recv(client, buf, len); |
68957303 CR |
385 | if (r < 0) |
386 | msleep(wait_tab[i]); | |
387 | } | |
a3c5d8fb | 388 | mutex_unlock(&phy->phy_lock); |
68957303 CR |
389 | |
390 | if (r != len) { | |
391 | phy->current_read_len = 0; | |
392 | return -EREMOTEIO; | |
393 | } | |
394 | ||
c97ffdbf CR |
395 | /* |
396 | * The first read sequence does not start with SOF. | |
397 | * Data is corrupeted so we drop it. | |
398 | */ | |
8e9466cc | 399 | if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
400 | skb_trim(skb, 0); |
401 | phy->current_read_len = 0; | |
402 | return -EIO; | |
8e9466cc | 403 | } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) { |
c97ffdbf CR |
404 | /* |
405 | * Previous frame transmission was interrupted and | |
406 | * the frame got repeated. | |
407 | * Received frame start with ST21NFCA_SOF_EOF + 00. | |
408 | */ | |
409 | skb_trim(skb, 0); | |
410 | phy->current_read_len = 0; | |
411 | } | |
412 | ||
413 | memcpy(skb_put(skb, len), buf, len); | |
414 | ||
415 | if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) { | |
68957303 CR |
416 | phy->current_read_len = 0; |
417 | return st21nfca_hci_i2c_repack(skb); | |
418 | } | |
419 | phy->current_read_len++; | |
420 | return -EAGAIN; | |
421 | } | |
422 | return -EIO; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Reads an shdlc frame from the chip. This is not as straightforward as it | |
427 | * seems. The frame format is data-crc, and corruption can occur anywhere | |
428 | * while transiting on i2c bus, such that we could read an invalid data. | |
429 | * The tricky case is when we read a corrupted data or crc. We must detect | |
430 | * this here in order to determine that data can be transmitted to the hci | |
431 | * core. This is the reason why we check the crc here. | |
432 | * The CLF will repeat a frame until we send a RR on that frame. | |
433 | * | |
434 | * On ST21NFCA, IRQ goes in idle when read starts. As no size information are | |
435 | * available in the incoming data, other IRQ might come. Every IRQ will trigger | |
436 | * a read sequence with different length and will fill the current frame. | |
437 | * The reception is complete once we reach a ST21NFCA_SOF_EOF. | |
438 | */ | |
439 | static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id) | |
440 | { | |
441 | struct st21nfca_i2c_phy *phy = phy_id; | |
442 | struct i2c_client *client; | |
443 | ||
444 | int r; | |
445 | ||
446 | if (!phy || irq != phy->i2c_dev->irq) { | |
447 | WARN_ON_ONCE(1); | |
448 | return IRQ_NONE; | |
449 | } | |
450 | ||
451 | client = phy->i2c_dev; | |
452 | dev_dbg(&client->dev, "IRQ\n"); | |
453 | ||
454 | if (phy->hard_fault != 0) | |
455 | return IRQ_HANDLED; | |
456 | ||
457 | r = st21nfca_hci_i2c_read(phy, phy->pending_skb); | |
458 | if (r == -EREMOTEIO) { | |
459 | phy->hard_fault = r; | |
460 | ||
461 | nfc_hci_recv_frame(phy->hdev, NULL); | |
462 | ||
463 | return IRQ_HANDLED; | |
464 | } else if (r == -EAGAIN || r == -EIO) { | |
465 | return IRQ_HANDLED; | |
466 | } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) { | |
467 | /* | |
468 | * With ST21NFCA, only one interface (I2C, RF or SWP) | |
469 | * may be active at a time. | |
470 | * Having incorrect crc is usually due to i2c macrocell | |
471 | * deactivation in the middle of a transmission. | |
472 | * It may generate corrupted data on i2c. | |
473 | * We give sometime to get i2c back. | |
474 | * The complete frame will be repeated. | |
475 | */ | |
476 | msleep(wait_tab[phy->crc_trials]); | |
477 | phy->crc_trials++; | |
478 | phy->current_read_len = 0; | |
0c942b00 | 479 | kfree_skb(phy->pending_skb); |
68957303 CR |
480 | } else if (r > 0) { |
481 | /* | |
482 | * We succeeded to read data from the CLF and | |
483 | * data is valid. | |
484 | * Reset counter. | |
485 | */ | |
486 | nfc_hci_recv_frame(phy->hdev, phy->pending_skb); | |
487 | phy->crc_trials = 0; | |
cf577344 CR |
488 | } else { |
489 | kfree_skb(phy->pending_skb); | |
68957303 CR |
490 | } |
491 | ||
492 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); | |
493 | if (phy->pending_skb == NULL) { | |
494 | phy->hard_fault = -ENOMEM; | |
495 | nfc_hci_recv_frame(phy->hdev, NULL); | |
496 | } | |
497 | ||
498 | return IRQ_HANDLED; | |
499 | } | |
500 | ||
501 | static struct nfc_phy_ops i2c_phy_ops = { | |
502 | .write = st21nfca_hci_i2c_write, | |
503 | .enable = st21nfca_hci_i2c_enable, | |
504 | .disable = st21nfca_hci_i2c_disable, | |
505 | }; | |
506 | ||
dfa8070d CR |
507 | static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client *client) |
508 | { | |
509 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); | |
dfa8070d | 510 | struct gpio_desc *gpiod_ena; |
070718a4 | 511 | struct device *dev = &client->dev; |
bd9d5232 | 512 | u8 tmp; |
dfa8070d | 513 | |
dfa8070d CR |
514 | /* Get EN GPIO from ACPI */ |
515 | gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1, | |
516 | GPIOD_OUT_LOW); | |
b58afe6d CR |
517 | if (!IS_ERR(gpiod_ena)) { |
518 | nfc_err(dev, "Unable to get ENABLE GPIO\n"); | |
519 | return -ENODEV; | |
520 | } | |
dfa8070d CR |
521 | |
522 | phy->gpio_ena = desc_to_gpio(gpiod_ena); | |
523 | ||
524 | phy->irq_polarity = irq_get_trigger_type(client->irq); | |
525 | ||
bd9d5232 CR |
526 | phy->se_status.is_ese_present = false; |
527 | phy->se_status.is_uicc_present = false; | |
528 | ||
529 | if (device_property_present(dev, "ese-present")) { | |
530 | device_property_read_u8(dev, "ese-present", &tmp); | |
531 | phy->se_status.is_ese_present = tmp; | |
532 | } | |
533 | ||
534 | if (device_property_present(dev, "uicc-present")) { | |
535 | device_property_read_u8(dev, "uicc-present", &tmp); | |
536 | phy->se_status.is_uicc_present = tmp; | |
537 | } | |
dfa8070d CR |
538 | |
539 | return 0; | |
540 | } | |
541 | ||
c44cb2ed CR |
542 | static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client) |
543 | { | |
544 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); | |
545 | struct device_node *pp; | |
546 | int gpio; | |
547 | int r; | |
548 | ||
549 | pp = client->dev.of_node; | |
550 | if (!pp) | |
551 | return -ENODEV; | |
552 | ||
553 | /* Get GPIO from device tree */ | |
554 | gpio = of_get_named_gpio(pp, "enable-gpios", 0); | |
555 | if (gpio < 0) { | |
556 | nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n"); | |
557 | return gpio; | |
558 | } | |
559 | ||
560 | /* GPIO request and configuration */ | |
0be8ce73 | 561 | r = devm_gpio_request_one(&client->dev, gpio, GPIOF_OUT_INIT_HIGH, |
04e99b71 | 562 | ST21NFCA_GPIO_NAME_EN); |
c44cb2ed CR |
563 | if (r) { |
564 | nfc_err(&client->dev, "Failed to request enable pin\n"); | |
67df3f95 | 565 | return r; |
c44cb2ed CR |
566 | } |
567 | ||
c44cb2ed CR |
568 | phy->gpio_ena = gpio; |
569 | ||
40af86a4 | 570 | phy->irq_polarity = irq_get_trigger_type(client->irq); |
c44cb2ed | 571 | |
2130fb97 CR |
572 | phy->se_status.is_ese_present = |
573 | of_property_read_bool(pp, "ese-present"); | |
574 | phy->se_status.is_uicc_present = | |
575 | of_property_read_bool(pp, "uicc-present"); | |
576 | ||
c44cb2ed CR |
577 | return 0; |
578 | } | |
c44cb2ed | 579 | |
fcb45e6a | 580 | static int st21nfca_hci_i2c_request_resources(struct i2c_client *client) |
68957303 CR |
581 | { |
582 | struct st21nfca_nfc_platform_data *pdata; | |
fcb45e6a | 583 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); |
68957303 CR |
584 | int r; |
585 | ||
586 | pdata = client->dev.platform_data; | |
587 | if (pdata == NULL) { | |
588 | nfc_err(&client->dev, "No platform data\n"); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | /* store for later use */ | |
68957303 CR |
593 | phy->gpio_ena = pdata->gpio_ena; |
594 | phy->irq_polarity = pdata->irq_polarity; | |
68957303 | 595 | |
fcb45e6a | 596 | if (phy->gpio_ena > 0) { |
0be8ce73 | 597 | r = devm_gpio_request_one(&client->dev, phy->gpio_ena, |
04e99b71 CR |
598 | GPIOF_OUT_INIT_HIGH, |
599 | ST21NFCA_GPIO_NAME_EN); | |
68957303 CR |
600 | if (r) { |
601 | pr_err("%s : ena gpio_request failed\n", __FILE__); | |
67df3f95 | 602 | return r; |
68957303 | 603 | } |
68957303 CR |
604 | } |
605 | ||
2130fb97 CR |
606 | phy->se_status.is_ese_present = pdata->is_ese_present; |
607 | phy->se_status.is_uicc_present = pdata->is_uicc_present; | |
608 | ||
fcb45e6a | 609 | return 0; |
68957303 CR |
610 | } |
611 | ||
612 | static int st21nfca_hci_i2c_probe(struct i2c_client *client, | |
613 | const struct i2c_device_id *id) | |
614 | { | |
615 | struct st21nfca_i2c_phy *phy; | |
616 | struct st21nfca_nfc_platform_data *pdata; | |
fcb45e6a | 617 | int r; |
68957303 CR |
618 | |
619 | dev_dbg(&client->dev, "%s\n", __func__); | |
620 | dev_dbg(&client->dev, "IRQ: %d\n", client->irq); | |
621 | ||
622 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
623 | nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); | |
624 | return -ENODEV; | |
625 | } | |
626 | ||
627 | phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy), | |
628 | GFP_KERNEL); | |
2b702832 | 629 | if (!phy) |
68957303 | 630 | return -ENOMEM; |
68957303 CR |
631 | |
632 | phy->i2c_dev = client; | |
fcb45e6a CR |
633 | phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); |
634 | if (phy->pending_skb == NULL) | |
635 | return -ENOMEM; | |
68957303 | 636 | |
fcb45e6a CR |
637 | phy->current_read_len = 0; |
638 | phy->crc_trials = 0; | |
a3c5d8fb | 639 | mutex_init(&phy->phy_lock); |
68957303 CR |
640 | i2c_set_clientdata(client, phy); |
641 | ||
642 | pdata = client->dev.platform_data; | |
c44cb2ed CR |
643 | if (!pdata && client->dev.of_node) { |
644 | r = st21nfca_hci_i2c_of_request_resources(client); | |
645 | if (r) { | |
646 | nfc_err(&client->dev, "No platform data\n"); | |
647 | return r; | |
648 | } | |
649 | } else if (pdata) { | |
650 | r = st21nfca_hci_i2c_request_resources(client); | |
651 | if (r) { | |
652 | nfc_err(&client->dev, "Cannot get platform resources\n"); | |
653 | return r; | |
654 | } | |
dfa8070d CR |
655 | } else if (ACPI_HANDLE(&client->dev)) { |
656 | r = st21nfca_hci_i2c_acpi_request_resources(client); | |
657 | if (r) { | |
658 | nfc_err(&client->dev, "Cannot get ACPI data\n"); | |
659 | return r; | |
660 | } | |
c44cb2ed CR |
661 | } else { |
662 | nfc_err(&client->dev, "st21nfca platform resources not available\n"); | |
fcb45e6a CR |
663 | return -ENODEV; |
664 | } | |
fcb45e6a | 665 | |
18d2c624 CR |
666 | r = st21nfca_hci_platform_init(phy); |
667 | if (r < 0) { | |
668 | nfc_err(&client->dev, "Unable to reboot st21nfca\n"); | |
67df3f95 | 669 | return r; |
18d2c624 CR |
670 | } |
671 | ||
68957303 CR |
672 | r = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
673 | st21nfca_hci_irq_thread_fn, | |
674 | phy->irq_polarity | IRQF_ONESHOT, | |
675 | ST21NFCA_HCI_DRIVER_NAME, phy); | |
676 | if (r < 0) { | |
677 | nfc_err(&client->dev, "Unable to register IRQ handler\n"); | |
678 | return r; | |
679 | } | |
680 | ||
9bac75d0 | 681 | return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME, |
2130fb97 CR |
682 | ST21NFCA_FRAME_HEADROOM, |
683 | ST21NFCA_FRAME_TAILROOM, | |
684 | ST21NFCA_HCI_LLC_MAX_PAYLOAD, | |
685 | &phy->hdev, | |
686 | &phy->se_status); | |
68957303 CR |
687 | } |
688 | ||
689 | static int st21nfca_hci_i2c_remove(struct i2c_client *client) | |
690 | { | |
691 | struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); | |
692 | ||
693 | dev_dbg(&client->dev, "%s\n", __func__); | |
694 | ||
695 | st21nfca_hci_remove(phy->hdev); | |
696 | ||
697 | if (phy->powered) | |
698 | st21nfca_hci_i2c_disable(phy); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
39db2d21 CR |
703 | static struct i2c_device_id st21nfca_hci_i2c_id_table[] = { |
704 | {ST21NFCA_HCI_DRIVER_NAME, 0}, | |
705 | {} | |
706 | }; | |
707 | MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table); | |
708 | ||
dfa8070d CR |
709 | static const struct acpi_device_id st21nfca_hci_i2c_acpi_match[] = { |
710 | {"SMO2100", 0}, | |
711 | {} | |
712 | }; | |
713 | MODULE_DEVICE_TABLE(acpi, st21nfca_hci_i2c_acpi_match); | |
714 | ||
c44cb2ed | 715 | static const struct of_device_id of_st21nfca_i2c_match[] = { |
6b5fba4e | 716 | { .compatible = "st,st21nfca-i2c", }, |
c44cb2ed CR |
717 | { .compatible = "st,st21nfca_i2c", }, |
718 | {} | |
719 | }; | |
17e40107 | 720 | MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match); |
c44cb2ed | 721 | |
68957303 CR |
722 | static struct i2c_driver st21nfca_hci_i2c_driver = { |
723 | .driver = { | |
fcb45e6a | 724 | .name = ST21NFCA_HCI_I2C_DRIVER_NAME, |
c44cb2ed | 725 | .of_match_table = of_match_ptr(of_st21nfca_i2c_match), |
dfa8070d | 726 | .acpi_match_table = ACPI_PTR(st21nfca_hci_i2c_acpi_match), |
fcb45e6a | 727 | }, |
68957303 CR |
728 | .probe = st21nfca_hci_i2c_probe, |
729 | .id_table = st21nfca_hci_i2c_id_table, | |
730 | .remove = st21nfca_hci_i2c_remove, | |
731 | }; | |
68957303 CR |
732 | module_i2c_driver(st21nfca_hci_i2c_driver); |
733 | ||
734 | MODULE_LICENSE("GPL"); | |
735 | MODULE_DESCRIPTION(DRIVER_DESC); |