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[deliverable/linux.git] / drivers / nfc / pn544.c
CommitLineData
0329326e
MA		 1/*
2 * Driver for the PN544 NFC chip.
3 *
4 * Copyright (C) Nokia Corporation
5 *
6 * Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
7 * Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/completion.h>
24#include <linux/crc-ccitt.h>
25#include <linux/delay.h>
26#include <linux/interrupt.h>
27#include <linux/kernel.h>
28#include <linux/miscdevice.h>
29#include <linux/module.h>
30#include <linux/mutex.h>
31#include <linux/nfc/pn544.h>
32#include <linux/poll.h>
33#include <linux/regulator/consumer.h>
34#include <linux/serial_core.h> /* for TCGETS */
35#include <linux/slab.h>
36
37#define DRIVER_CARD "PN544 NFC"
38#define DRIVER_DESC "NFC driver for PN544"
39
40static struct i2c_device_id pn544_id_table[] = {
41 { PN544_DRIVER_NAME, 0 },
42 { }
43};
44MODULE_DEVICE_TABLE(i2c, pn544_id_table);
45
46#define HCI_MODE 0
47#define FW_MODE 1
48
49enum pn544_state {
50 PN544_ST_COLD,
51 PN544_ST_FW_READY,
52 PN544_ST_READY,
53};
54
55enum pn544_irq {
56 PN544_NONE,
57 PN544_INT,
58};
59
60struct pn544_info {
61 struct miscdevice miscdev;
62 struct i2c_client *i2c_dev;
ac3c8304 63 struct regulator_bulk_data regs[3];
0329326e
MA		 64
65 enum pn544_state state;
66 wait_queue_head_t read_wait;
67 loff_t read_offset;
68 enum pn544_irq read_irq;
69 struct mutex read_mutex; /* Serialize read_irq access */
70 struct mutex mutex; /* Serialize info struct access */
71 u8 *buf;
e78bf5e6 72 size_t buflen;
0329326e
MA		 73};
74
75static const char reg_vdd_io[] = "Vdd_IO";
76static const char reg_vbat[] = "VBat";
ac3c8304 77static const char reg_vsim[] = "VSim";
0329326e
MA		 78
79/* sysfs interface */
80static ssize_t pn544_test(struct device *dev,
81 struct device_attribute *attr, char *buf)
82{
83 struct pn544_info *info = dev_get_drvdata(dev);
84 struct i2c_client *client = info->i2c_dev;
85 struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
86
87 return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test());
88}
89
90static int pn544_enable(struct pn544_info *info, int mode)
91{
92 struct pn544_nfc_platform_data *pdata;
93 struct i2c_client *client = info->i2c_dev;
94
95 int r;
96
97 r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs);
98 if (r < 0)
99 return r;
100
101 pdata = client->dev.platform_data;
102 info->read_irq = PN544_NONE;
103 if (pdata->enable)
104 pdata->enable(mode);
105
106 if (mode) {
107 info->state = PN544_ST_FW_READY;
108 dev_dbg(&client->dev, "now in FW-mode\n");
109 } else {
110 info->state = PN544_ST_READY;
111 dev_dbg(&client->dev, "now in HCI-mode\n");
112 }
113
114 usleep_range(10000, 15000);
115
116 return 0;
117}
118
119static void pn544_disable(struct pn544_info *info)
120{
121 struct pn544_nfc_platform_data *pdata;
122 struct i2c_client *client = info->i2c_dev;
123
124 pdata = client->dev.platform_data;
125 if (pdata->disable)
126 pdata->disable();
127
128 info->state = PN544_ST_COLD;
129
130 dev_dbg(&client->dev, "Now in OFF-mode\n");
131
132 msleep(PN544_RESETVEN_TIME);
133
134 info->read_irq = PN544_NONE;
135 regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs);
136}
137
138static int check_crc(u8 *buf, int buflen)
139{
140 u8 len;
141 u16 crc;
142
143 len = buf[0] + 1;
144 if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) {
145 pr_err(PN544_DRIVER_NAME
146 ": CRC; corrupt packet len %u (%d)\n", len, buflen);
147 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
148 16, 2, buf, buflen, false);
149 return -EPERM;
150 }
151 crc = crc_ccitt(0xffff, buf, len - 2);
152 crc = ~crc;
153
154 if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) {
155 pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
156 crc, buf[len-1], buf[len-2]);
157
158 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
159 16, 2, buf, buflen, false);
160 return -EPERM;
161 }
162 return 0;
163}
164
165static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len)
166{
167 int r;
168
169 if (len < 4 || len != (buf[0] + 1)) {
170 dev_err(&client->dev, "%s: Illegal message length: %d\n",
171 __func__, len);
172 return -EINVAL;
173 }
174
175 if (check_crc(buf, len))
176 return -EINVAL;
177
178 usleep_range(3000, 6000);
179
180 r = i2c_master_send(client, buf, len);
181 dev_dbg(&client->dev, "send: %d\n", r);
182
183 if (r == -EREMOTEIO) { /* Retry, chip was in standby */
184 usleep_range(6000, 10000);
185 r = i2c_master_send(client, buf, len);
186 dev_dbg(&client->dev, "send2: %d\n", r);
187 }
188
189 if (r != len)
190 return -EREMOTEIO;
191
192 return r;
193}
194
195static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen)
196{
197 int r;
198 u8 len;
199
200 /*
201 * You could read a packet in one go, but then you'd need to read
202 * max size and rest would be 0xff fill, so we do split reads.
203 */
204 r = i2c_master_recv(client, &len, 1);
205 dev_dbg(&client->dev, "recv1: %d\n", r);
206
207 if (r != 1)
208 return -EREMOTEIO;
209
210 if (len < PN544_LLC_HCI_OVERHEAD)
211 len = PN544_LLC_HCI_OVERHEAD;
212 else if (len > (PN544_MSG_MAX_SIZE - 1))
213 len = PN544_MSG_MAX_SIZE - 1;
214
215 if (1 + len > buflen) /* len+(data+crc16) */
216 return -EMSGSIZE;
217
218 buf[0] = len;
219
220 r = i2c_master_recv(client, buf + 1, len);
221 dev_dbg(&client->dev, "recv2: %d\n", r);
222
223 if (r != len)
224 return -EREMOTEIO;
225
226 usleep_range(3000, 6000);
227
228 return r + 1;
229}
230
231static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len)
232{
233 int r;
234
235 dev_dbg(&client->dev, "%s\n", __func__);
236
237 if (len < PN544_FW_HEADER_SIZE ||
238 (PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len)
239 return -EINVAL;
240
241 r = i2c_master_send(client, buf, len);
242 dev_dbg(&client->dev, "fw send: %d\n", r);
243
244 if (r == -EREMOTEIO) { /* Retry, chip was in standby */
245 usleep_range(6000, 10000);
246 r = i2c_master_send(client, buf, len);
247 dev_dbg(&client->dev, "fw send2: %d\n", r);
248 }
249
250 if (r != len)
251 return -EREMOTEIO;
252
253 return r;
254}
255
256static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen)
257{
258 int r, len;
259
260 if (buflen < PN544_FW_HEADER_SIZE)
261 return -EINVAL;
262
263 r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE);
264 dev_dbg(&client->dev, "FW recv1: %d\n", r);
265
266 if (r < 0)
267 return r;
268
269 if (r < PN544_FW_HEADER_SIZE)
270 return -EINVAL;
271
272 len = (buf[1] << 8) + buf[2];
273 if (len == 0) /* just header, no additional data */
274 return r;
275
276 if (len > buflen - PN544_FW_HEADER_SIZE)
277 return -EMSGSIZE;
278
279 r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len);
280 dev_dbg(&client->dev, "fw recv2: %d\n", r);
281
282 if (r != len)
283 return -EINVAL;
284
285 return r + PN544_FW_HEADER_SIZE;
286}
287
288static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id)
289{
290 struct pn544_info *info = dev_id;
291 struct i2c_client *client = info->i2c_dev;
292
293 BUG_ON(!info);
294 BUG_ON(irq != info->i2c_dev->irq);
295
296 dev_dbg(&client->dev, "IRQ\n");
297
298 mutex_lock(&info->read_mutex);
299 info->read_irq = PN544_INT;
300 mutex_unlock(&info->read_mutex);
301
302 wake_up_interruptible(&info->read_wait);
303
304 return IRQ_HANDLED;
305}
306
307static enum pn544_irq pn544_irq_state(struct pn544_info *info)
308{
309 enum pn544_irq irq;
310
311 mutex_lock(&info->read_mutex);
312 irq = info->read_irq;
313 mutex_unlock(&info->read_mutex);
314 /*
315 * XXX: should we check GPIO-line status directly?
316 * return pdata->irq_status() ? PN544_INT : PN544_NONE;
317 */
318
319 return irq;
320}
321
322static ssize_t pn544_read(struct file *file, char __user *buf,
323 size_t count, loff_t *offset)
324{
325 struct pn544_info *info = container_of(file->private_data,
326 struct pn544_info, miscdev);
327 struct i2c_client *client = info->i2c_dev;
328 enum pn544_irq irq;
329 size_t len;
330 int r = 0;
331
332 dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
333 info, count);
334
335 mutex_lock(&info->mutex);
336
337 if (info->state == PN544_ST_COLD) {
338 r = -ENODEV;
339 goto out;
340 }
341
342 irq = pn544_irq_state(info);
343 if (irq == PN544_NONE) {
344 if (file->f_flags & O_NONBLOCK) {
345 r = -EAGAIN;
346 goto out;
347 }
348
349 if (wait_event_interruptible(info->read_wait,
350 (info->read_irq == PN544_INT))) {
351 r = -ERESTARTSYS;
352 goto out;
353 }
354 }
355
356 if (info->state == PN544_ST_FW_READY) {
357 len = min(count, info->buflen);
358
359 mutex_lock(&info->read_mutex);
360 r = pn544_fw_read(info->i2c_dev, info->buf, len);
361 info->read_irq = PN544_NONE;
362 mutex_unlock(&info->read_mutex);
363
364 if (r < 0) {
365 dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r);
366 goto out;
367 }
368
369 print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE,
370 16, 2, info->buf, r, false);
371
372 *offset += r;
373 if (copy_to_user(buf, info->buf, r)) {
374 r = -EFAULT;
375 goto out;
376 }
377 } else {
378 len = min(count, info->buflen);
379
380 mutex_lock(&info->read_mutex);
381 r = pn544_i2c_read(info->i2c_dev, info->buf, len);
382 info->read_irq = PN544_NONE;
383 mutex_unlock(&info->read_mutex);
384
385 if (r < 0) {
386 dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r);
387 goto out;
388 }
389 print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE,
390 16, 2, info->buf, r, false);
391
392 *offset += r;
393 if (copy_to_user(buf, info->buf, r)) {
394 r = -EFAULT;
395 goto out;
396 }
397 }
398
399out:
400 mutex_unlock(&info->mutex);
401
402 return r;
403}
404
405static unsigned int pn544_poll(struct file *file, poll_table *wait)
406{
407 struct pn544_info *info = container_of(file->private_data,
408 struct pn544_info, miscdev);
409 struct i2c_client *client = info->i2c_dev;
410 int r = 0;
411
412 dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
413
414 mutex_lock(&info->mutex);
415
416 if (info->state == PN544_ST_COLD) {
417 r = -ENODEV;
418 goto out;
419 }
420
421 poll_wait(file, &info->read_wait, wait);
422
423 if (pn544_irq_state(info) == PN544_INT) {
424 r = POLLIN | POLLRDNORM;
425 goto out;
426 }
427out:
428 mutex_unlock(&info->mutex);
429
430 return r;
431}
432
433static ssize_t pn544_write(struct file *file, const char __user *buf,
434 size_t count, loff_t *ppos)
435{
436 struct pn544_info *info = container_of(file->private_data,
437 struct pn544_info, miscdev);
438 struct i2c_client *client = info->i2c_dev;
439 ssize_t len;
440 int r;
441
442 dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
443 info, count);
444
445 mutex_lock(&info->mutex);
446
447 if (info->state == PN544_ST_COLD) {
448 r = -ENODEV;
449 goto out;
450 }
451
452 /*
453 * XXX: should we detect rset-writes and clean possible
454 * read_irq state
455 */
456 if (info->state == PN544_ST_FW_READY) {
457 size_t fw_len;
458
459 if (count < PN544_FW_HEADER_SIZE) {
460 r = -EINVAL;
461 goto out;
462 }
463
464 len = min(count, info->buflen);
465 if (copy_from_user(info->buf, buf, len)) {
466 r = -EFAULT;
467 goto out;
468 }
469
470 print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE,
471 16, 2, info->buf, len, false);
472
473 fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) +
474 info->buf[2];
475
476 if (len > fw_len) /* 1 msg at a time */
477 len = fw_len;
478
479 r = pn544_fw_write(info->i2c_dev, info->buf, len);
480 } else {
481 if (count < PN544_LLC_MIN_SIZE) {
482 r = -EINVAL;
483 goto out;
484 }
485
486 len = min(count, info->buflen);
487 if (copy_from_user(info->buf, buf, len)) {
488 r = -EFAULT;
489 goto out;
490 }
491
492 print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE,
493 16, 2, info->buf, len, false);
494
495 if (len > (info->buf[0] + 1)) /* 1 msg at a time */
496 len = info->buf[0] + 1;
497
498 r = pn544_i2c_write(info->i2c_dev, info->buf, len);
499 }
500out:
501 mutex_unlock(&info->mutex);
502
503 return r;
504
505}
506
507static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
508{
509 struct pn544_info *info = container_of(file->private_data,
510 struct pn544_info, miscdev);
511 struct i2c_client *client = info->i2c_dev;
512 struct pn544_nfc_platform_data *pdata;
513 unsigned int val;
514 int r = 0;
515
516 dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd);
517
518 mutex_lock(&info->mutex);
519
520 if (info->state == PN544_ST_COLD) {
521 r = -ENODEV;
522 goto out;
523 }
524
525 pdata = info->i2c_dev->dev.platform_data;
526 switch (cmd) {
527 case PN544_GET_FW_MODE:
528 dev_dbg(&client->dev, "%s: PN544_GET_FW_MODE\n", __func__);
529
530 val = (info->state == PN544_ST_FW_READY);
531 if (copy_to_user((void __user *)arg, &val, sizeof(val))) {
532 r = -EFAULT;
533 goto out;
534 }
535
536 break;
537
538 case PN544_SET_FW_MODE:
539 dev_dbg(&client->dev, "%s: PN544_SET_FW_MODE\n", __func__);
540
541 if (copy_from_user(&val, (void __user *)arg, sizeof(val))) {
542 r = -EFAULT;
543 goto out;
544 }
545
546 if (val) {
547 if (info->state == PN544_ST_FW_READY)
548 break;
549
550 pn544_disable(info);
551 r = pn544_enable(info, FW_MODE);
552 if (r < 0)
553 goto out;
554 } else {
555 if (info->state == PN544_ST_READY)
556 break;
557 pn544_disable(info);
558 r = pn544_enable(info, HCI_MODE);
559 if (r < 0)
560 goto out;
561 }
562 file->f_pos = info->read_offset;
563 break;
564
565 case TCGETS:
566 dev_dbg(&client->dev, "%s: TCGETS\n", __func__);
567
568 r = -ENOIOCTLCMD;
569 break;
570
571 default:
572 dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd);
573 r = -ENOIOCTLCMD;
574 break;
575 }
576
577out:
578 mutex_unlock(&info->mutex);
579
580 return r;
581}
582
583static int pn544_open(struct inode *inode, struct file *file)
584{
585 struct pn544_info *info = container_of(file->private_data,
586 struct pn544_info, miscdev);
587 struct i2c_client *client = info->i2c_dev;
588 int r = 0;
589
590 dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
591 info, info->i2c_dev);
592
593 mutex_lock(&info->mutex);
594
595 /*
596 * Only 1 at a time.
597 * XXX: maybe user (counter) would work better
598 */
599 if (info->state != PN544_ST_COLD) {
600 r = -EBUSY;
601 goto out;
602 }
603
604 file->f_pos = info->read_offset;
605 r = pn544_enable(info, HCI_MODE);
606
607out:
608 mutex_unlock(&info->mutex);
609 return r;
610}
611
612static int pn544_close(struct inode *inode, struct file *file)
613{
614 struct pn544_info *info = container_of(file->private_data,
615 struct pn544_info, miscdev);
616 struct i2c_client *client = info->i2c_dev;
617
618 dev_dbg(&client->dev, "%s: info: %p, client %p\n",
619 __func__, info, info->i2c_dev);
620
621 mutex_lock(&info->mutex);
622 pn544_disable(info);
623 mutex_unlock(&info->mutex);
624
625 return 0;
626}
627
628static const struct file_operations pn544_fops = {
629 .owner = THIS_MODULE,
630 .llseek = no_llseek,
631 .read = pn544_read,
632 .write = pn544_write,
633 .poll = pn544_poll,
634 .open = pn544_open,
635 .release = pn544_close,
636 .unlocked_ioctl = pn544_ioctl,
637};
638
639#ifdef CONFIG_PM
640static int pn544_suspend(struct device *dev)
641{
642 struct i2c_client *client = to_i2c_client(dev);
643 struct pn544_info *info;
644 int r = 0;
645
646 dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client);
647
648 info = i2c_get_clientdata(client);
649 dev_info(&client->dev, "%s: info: %p, client %p\n", __func__,
650 info, client);
651
652 mutex_lock(&info->mutex);
653
654 switch (info->state) {
655 case PN544_ST_FW_READY:
656 /* Do not suspend while upgrading FW, please! */
657 r = -EPERM;
658 break;
659
660 case PN544_ST_READY:
661 /*
662 * CHECK: Device should be in standby-mode. No way to check?
663 * Allowing low power mode for the regulator is potentially
664 * dangerous if pn544 does not go to suspension.
665 */
666 break;
667
668 case PN544_ST_COLD:
669 break;
670 };
671
672 mutex_unlock(&info->mutex);
673 return r;
674}
675
676static int pn544_resume(struct device *dev)
677{
678 struct i2c_client *client = to_i2c_client(dev);
679 struct pn544_info *info = i2c_get_clientdata(client);
680 int r = 0;
681
682 dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
683 info, client);
684
685 mutex_lock(&info->mutex);
686
687 switch (info->state) {
688 case PN544_ST_READY:
689 /*
690 * CHECK: If regulator low power mode is allowed in
691 * pn544_suspend, we should go back to normal mode
692 * here.
693 */
694 break;
695
696 case PN544_ST_COLD:
697 break;
698
699 case PN544_ST_FW_READY:
700 break;
701 };
702
703 mutex_unlock(&info->mutex);
704
705 return r;
706}
707
708static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
709#endif
710
711static struct device_attribute pn544_attr =
712 __ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
713
714static int __devinit pn544_probe(struct i2c_client *client,
715 const struct i2c_device_id *id)
716{
717 struct pn544_info *info;
718 struct pn544_nfc_platform_data *pdata;
719 int r = 0;
720
721 dev_dbg(&client->dev, "%s\n", __func__);
722 dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
723
724 /* private data allocation */
725 info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL);
726 if (!info) {
727 dev_err(&client->dev,
728 "Cannot allocate memory for pn544_info.\n");
729 r = -ENOMEM;
730 goto err_info_alloc;
731 }
732
733 info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER);
734 info->buf = kzalloc(info->buflen, GFP_KERNEL);
735 if (!info->buf) {
736 dev_err(&client->dev,
737 "Cannot allocate memory for pn544_info->buf.\n");
738 r = -ENOMEM;
739 goto err_buf_alloc;
740 }
741
742 info->regs[0].supply = reg_vdd_io;
743 info->regs[1].supply = reg_vbat;
ac3c8304 744 info->regs[2].supply = reg_vsim;
0329326e
MA		 745 r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs),
746 info->regs);
747 if (r < 0)
748 goto err_kmalloc;
749
750 info->i2c_dev = client;
751 info->state = PN544_ST_COLD;
752 info->read_irq = PN544_NONE;
753 mutex_init(&info->read_mutex);
754 mutex_init(&info->mutex);
755 init_waitqueue_head(&info->read_wait);
756 i2c_set_clientdata(client, info);
757 pdata = client->dev.platform_data;
758 if (!pdata) {
759 dev_err(&client->dev, "No platform data\n");
760 r = -EINVAL;
761 goto err_reg;
762 }
763
764 if (!pdata->request_resources) {
765 dev_err(&client->dev, "request_resources() missing\n");
766 r = -EINVAL;
767 goto err_reg;
768 }
769
770 r = pdata->request_resources(client);
771 if (r) {
772 dev_err(&client->dev, "Cannot get platform resources\n");
773 goto err_reg;
774 }
775
776 r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn,
777 IRQF_TRIGGER_RISING, PN544_DRIVER_NAME,
778 info);
779 if (r < 0) {
780 dev_err(&client->dev, "Unable to register IRQ handler\n");
781 goto err_res;
782 }
783
784 /* If we don't have the test we don't need the sysfs file */
785 if (pdata->test) {
786 r = device_create_file(&client->dev, &pn544_attr);
787 if (r) {
788 dev_err(&client->dev,
789 "sysfs registration failed, error %d\n", r);
790 goto err_irq;
791 }
792 }
793
794 info->miscdev.minor = MISC_DYNAMIC_MINOR;
795 info->miscdev.name = PN544_DRIVER_NAME;
796 info->miscdev.fops = &pn544_fops;
797 info->miscdev.parent = &client->dev;
798 r = misc_register(&info->miscdev);
799 if (r < 0) {
800 dev_err(&client->dev, "Device registration failed\n");
801 goto err_sysfs;
802 }
803
804 dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
805 __func__, info, pdata, client);
806
807 return 0;
808
809err_sysfs:
810 if (pdata->test)
811 device_remove_file(&client->dev, &pn544_attr);
812err_irq:
813 free_irq(client->irq, info);
814err_res:
815 if (pdata->free_resources)
816 pdata->free_resources();
817err_reg:
818 regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
819err_kmalloc:
820 kfree(info->buf);
821err_buf_alloc:
822 kfree(info);
823err_info_alloc:
824 return r;
825}
826
827static __devexit int pn544_remove(struct i2c_client *client)
828{
829 struct pn544_info *info = i2c_get_clientdata(client);
830 struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
831
832 dev_dbg(&client->dev, "%s\n", __func__);
833
834 misc_deregister(&info->miscdev);
835 if (pdata->test)
836 device_remove_file(&client->dev, &pn544_attr);
837
838 if (info->state != PN544_ST_COLD) {
839 if (pdata->disable)
840 pdata->disable();
841
842 info->read_irq = PN544_NONE;
843 }
844
845 free_irq(client->irq, info);
846 if (pdata->free_resources)
847 pdata->free_resources();
848
849 regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
850 kfree(info->buf);
851 kfree(info);
852
853 return 0;
854}
855
856static struct i2c_driver pn544_driver = {
857 .driver = {
858 .name = PN544_DRIVER_NAME,
859#ifdef CONFIG_PM
860 .pm = &pn544_pm_ops,
861#endif
862 },
863 .probe = pn544_probe,
864 .id_table = pn544_id_table,
865 .remove = __devexit_p(pn544_remove),
866};
867
868static int __init pn544_init(void)
869{
870 int r;
871
872 pr_debug(DRIVER_DESC ": %s\n", __func__);
873
874 r = i2c_add_driver(&pn544_driver);
875 if (r) {
876 pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
877 return r;
878 }
879
880 return 0;
881}
882
883static void __exit pn544_exit(void)
884{
885 i2c_del_driver(&pn544_driver);
886 pr_info(DRIVER_DESC ", Exiting.\n");
887}
888
889module_init(pn544_init);
890module_exit(pn544_exit);
891
892MODULE_LICENSE("GPL");
893MODULE_DESCRIPTION(DRIVER_DESC);
Linux kernel - Deliverables
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