Root/drivers/nfc/pn544.c

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;
63    struct regulator_bulk_data regs[3];
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;
72    size_t buflen;
73};
74
75static const char reg_vdd_io[] = "Vdd_IO";
76static const char reg_vbat[] = "VBat";
77static const char reg_vsim[] = "VSim";
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;
744    info->regs[2].supply = reg_vsim;
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);
894

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