-
Notifications
You must be signed in to change notification settings - Fork 2
/
rf_module.c
741 lines (629 loc) · 23.2 KB
/
rf_module.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/cdev.h>
#include <linux/gpio.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/of_gpio.h>
#include <linux/nrf24.h>
#include "rf_module.h"
#include "rf_helpers.h"
#include "rf_sysfs.h"
#define N_SPI_MINORS 9
static struct class *rf_class;
static struct cdev rf_cdev;
static dev_t rf_devt; /* Holds the Major number */
static DECLARE_BITMAP(minors, N_SPI_MINORS);
static LIST_HEAD(device_list);
static DEFINE_MUTEX(device_list_lock);
/*
* Sysfs attributes
*/
static DEVICE_ATTR(registers, 0600, show_reg, store_reg);
static DEVICE_ATTR(statistics, 0400, show_statistics, NULL);
static DEVICE_ATTR(config, 0400, show_config, NULL);
static struct attribute *rf_attrs[] = {
&dev_attr_registers.attr,
&dev_attr_statistics.attr,
&dev_attr_config.attr,
NULL,
};
static struct attribute_group rf_attr_group = {
.attrs = rf_attrs,
};
/*
* IRQ Stuff
*/
static irqreturn_t rf_hard_irq(int irq, void *handle)
{
return IRQ_WAKE_THREAD;
}
static irqreturn_t rf_irq(int irq, void *data)
{
u8 status;
struct rf_data *rf = data;
read_reg(rf->spi, STATUS_REG, &status, 1);
if (IS_SETTED(status, BIT(5))) {
_DEBUG("TX IRQ served");
complete(&rf->tx_complete);
rf->txcount++;
}
if (IS_SETTED(status, BIT(6))) {
_DEBUG("RX IRQ served");
rf->rxcount++;
rf->new_rx_data = 1;
wake_up(&rf->rx_wq);
}
return IRQ_HANDLED;
}
/*
* File oprations
*/
static int rf_open(struct inode *ip, struct file *fp)
{
struct rf_data *rf;
if (fp->private_data)
return 0;
mutex_lock(&device_list_lock);
list_for_each_entry(rf, &device_list, device_entry) {
if (rf->devt == ip->i_rdev) {
fp->private_data = rf;
SB1_MODE(rf->spi);
mutex_unlock(&device_list_lock);
udelay(150); /* power up delay */
return 0;
}
}
mutex_unlock(&device_list_lock);
return -ENODEV;
}
static int rf_release(struct inode *ip, struct file *fp)
{
struct rf_data *rf = fp->private_data;
if (!rf)
return -ENODEV;
PD_MODE(rf->spi);
fp->private_data = NULL;
return 0;
}
static ssize_t rf_write(struct file *fp,
const char __user *buf,
size_t len,
loff_t *off)
{
int status;
struct rf_data *rf = fp->private_data;
char pld[32];
int n;
size_t minlen = min(len, sizeof(pld));
if (!rf)
return -ENODEV;
n = copy_from_user(pld, buf, minlen);
if (n)
return -EIO;
_DEBUG("len: %d, minlen %d, *off: %lld",
len, minlen, *off);
status = TX(rf, pld, minlen, 1UL);
if (status == 0) {
_DEBUG("TX timedout");
return -ETIMEDOUT;
} else if (status < 0) {
_DEBUG("TX ERROR: %d", status);
return status;
}
_DEBUG("write transmited");
*off += minlen;
return minlen;
}
static ssize_t rf_read(struct file *fp,
char *buf,
size_t len,
loff_t *off)
{
char pld[32];
int n;
int rcvd;
int status;
struct rf_data *rf = fp->private_data;
if (!rf)
return -ENODEV;
/* returns >0 for success
* 0 for timeout
* <0 for error */
do {
status = RX(rf, pld, rcvd, 100UL);
} while (!status);
if (status < 0) {
_DEBUG("RX ERROR: %d", status);
return status;
}
n = copy_to_user(&buf[*off], pld, rcvd);
if (n)
return -EIO;
*off += rcvd;
return rcvd;
}
static long rf_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
long status = 0;
struct rf_data *rf = fp->private_data;
u8 rxbuf[5];
BUG_ON(!fp);
mutex_lock(&rf->bus_lock);
switch (cmd) {
case NRF24_IOCSAA:
_DEBUG("NRF24_IOCSAA: 0x%02lx", arg);
write_reg(rf->spi, EN_AA_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGAA:
_DEBUG("NRF24_IOCGAA");
read_reg(rf->spi, EN_AA_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSCRC: /* Bit 2,3 of CONFIG register */
_DEBUG("NRF24_IOCSCRC: %ld", arg);
read_reg(rf->spi, CONFIG_REG, rxbuf, 1);
switch (arg) {
case 0:
rxbuf[0] &= ~(BIT(2) | BIT(3));
break;
case 1:
rxbuf[0] |= BIT(3);
rxbuf[0] &= ~(BIT(2));
break;
case 2:
rxbuf[0] |= (BIT(2) | BIT(3));
break;
}
write_reg(rf->spi, CONFIG_REG, rxbuf, 1);
break;
case NRF24_IOCGCRC:
_DEBUG("NRF24_IOCGCRC");
read_reg(rf->spi, CONFIG_REG, rxbuf, 1);
if (!IS_SETTED(BIT(3), rxbuf[0])) /* 0bxxxx0xxx => Disabled */
put_user(0, (u8 __user *)arg);
else if (!IS_SETTED(BIT(2), rxbuf[0])) /* 0bxxxx10xx => Enabled, 1 byte*/
put_user(1, (u8 __user *)arg);
else
put_user(2, (u8 __user *)arg); /* 0bxxxx11xx => Enabled, 2 bytes */
break;
case NRF24_IOCSCH:
_DEBUG("NRF24_IOCSCH: %ld", arg);
write_reg(rf->spi, RF_CH_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGCH:
_DEBUG("NRF24_IOCGCH");
read_reg(rf->spi, RF_CH_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSPW:
_DEBUG("NRF24_IOCSPW: %ld", arg);
write_reg(rf->spi, RX_PW_P0_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGPW:
_DEBUG("NRF24_IOCGPW");
read_reg(rf->spi, RX_PW_P0_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSTXADDR:
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
if (copy_from_user(rxbuf, (u8 __user *)arg, aw)) {
pr_err("copy_from_user fails");
status = -EFAULT;
break;
}
#if defined(DEBUG)
switch (aw) {
case 3:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2]);
break;
case 4:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3]);
break;
case 5:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4]);
break;
}
#endif
write_reg(rf->spi, TX_ADDR_REG, rxbuf, aw);
} while (0);
break;
case NRF24_IOCGTXADDR:
_DEBUG("NRF24_IOCGTXADDR");
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
read_reg(rf->spi, TX_ADDR_REG, rxbuf, aw);
if (copy_to_user((u8 __user *)arg, rxbuf, aw)) {
pr_err("copy_to_user fails");
status = -EFAULT;
break;
}
} while (0);
break;
case NRF24_IOCSRXADDR:
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
if (copy_from_user(rxbuf, (u8 __user *)arg, aw)) {
pr_err("copy_from_user fails");
status = -EFAULT;
break;
}
#if defined(DEBUG)
switch (aw) {
case 3:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2]);
break;
case 4:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3]);
break;
case 5:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4]);
break;
}
#endif
write_reg(rf->spi, RX_ADDR_P0_REG, rxbuf, aw);
} while (0);
break;
case NRF24_IOCGRXADDR:
_DEBUG("NRF24_IOCGRXADDR");
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
read_reg(rf->spi, RX_ADDR_P0_REG, rxbuf, aw);
if (copy_to_user((u8 __user *)arg, rxbuf, aw)) {
pr_err("copy_to_user fails");
status = -EFAULT;
break;
}
} while (0);
break;
case NRF24_IOCSAW:
_DEBUG("NRF24_IOCSAW: %ld", arg);
arg -= 2;
write_reg(rf->spi, SETUP_AW_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGAW:
_DEBUG("NRF24_IOCGAW");
read_reg(rf->spi, SETUP_AW_REG, rxbuf, 1);
rxbuf[0] += 2;
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSRETR:
_DEBUG("NRF24_IOCSRETR: 0x%02lx", arg);
write_reg(rf->spi, SETUP_RETR_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGRETR:
_DEBUG("NRF24_IOCGRETR");
read_reg(rf->spi, SETUP_RETR_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSRF:
_DEBUG("NRF24_IOCSRF: 0x%02lx", arg);
write_reg(rf->spi, RF_SETUP_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGRF:
_DEBUG("NRF24_IOCGRF");
read_reg(rf->spi, RF_SETUP_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSDYNPLD:
_DEBUG("NRF24_IOCSDYNPLD: %ld", arg);
if (arg) { /* enable */
read_reg(rf->spi, FEATURE_REG, rxbuf, 1);
rxbuf[0] |= BIT(2);
write_reg(rf->spi, FEATURE_REG, rxbuf, 1); /* assert EN_DPL bit */
write_reg(rf->spi, DYNPD_REG, "\x01", 1); /* assert DPL_P0 bit */
} else { /* disable */
read_reg(rf->spi, FEATURE_REG, rxbuf, 1);
rxbuf[0] &= ~BIT(2);
write_reg(rf->spi, FEATURE_REG, rxbuf, 1); /* clear EN_DPL bit */
write_reg(rf->spi, DYNPD_REG, "\x00", 1); /* clear DPL_P0 bit */
}
break;
case NRF24_IOCGDYNPLD:
_DEBUG("NRF24_IOCGDYNPLD");
read_reg(rf->spi, DYNPD_REG, rxbuf, 1);
put_user((rxbuf[0] & BIT(0)), (u8 __user *)arg);
break;
case NRF24_IOTTR:
_DEBUG("NRF24_IOTTR");
do {
u8 tx_pld[32];
u8 rx_pld[32];
struct nrf_exch krn;
struct nrf_exch *usr = (struct nrf_exch *)arg;
int n = copy_from_user(&krn, usr, sizeof(krn));
unsigned long tout;
if (n) {
status = -EIO;
break;
}
_DEBUG("User timeout %u", krn.timeout);
tout = krn.timeout * HZ / 1000;
n = copy_from_user(tx_pld, krn.tx, min(sizeof(tx_pld), krn.tx_siz));
if (n) {
status = -EIO;
break;
}
status = TX(rf, tx_pld, krn.tx_siz, tout);
if (status <= 0) {
_DEBUG("TX timedout");
status = -ETIMEDOUT;
break;
};
_DEBUG("TTR transmited");
status = RX(rf, rx_pld, krn.rx_siz, tout);
if (status <= 0) {
_DEBUG("RX timedout");
status = -ETIMEDOUT;
break;
}
_DEBUG("TTR received");
n = copy_to_user(usr->rx, rx_pld, sizeof(rx_pld));
if (n) {
status = -EIO;
break;
}
put_user(krn.rx_siz, &usr->rx_siz);
status = 0;
_DEBUG("Returning 0");
} while (0);
break;
case NRF24_IORTT:
_DEBUG("NRF24_IORTT");
do {
u8 tx_pld[32];
u8 rx_pld[32];
struct nrf_exch krn;
struct nrf_exch *usr = (struct nrf_exch *)arg;
int n = copy_from_user(&krn, usr, sizeof(krn));
unsigned long tout;
tout = krn.timeout * HZ / 1000;
if (n) {
status = -EIO;
break;
}
status = RX(rf, rx_pld, krn.rx_siz, tout);
if (status <= 0) {
_DEBUG("RX timedout");
status = -ETIMEDOUT;
break;
}
_DEBUG("RTT received");
n = copy_from_user(tx_pld, krn.tx, sizeof(tx_pld));
if (n) {
status = -EIO;
break;
}
status = TX(rf, tx_pld, krn.tx_siz, tout);
if (status <= 0) {
_DEBUG("TX timedout");
status = -ETIMEDOUT;
break;
};
_DEBUG("RTT transmited");
n = copy_to_user(usr->rx, rx_pld, sizeof(rx_pld));
if (n) {
status = -EIO;
break;
}
status = 0;
_DEBUG("Returning 0");
} while (0);
break;
default:
pr_warn("Unsupported ioctl used on file %s\n", fp->f_path.dentry->d_name.name);
status = -ENOTTY;
break;
}
mutex_unlock(&rf->bus_lock);
return status;
}
static struct file_operations fops = {
.owner = THIS_MODULE,
.read = rf_read,
.write = rf_write,
.open = rf_open,
.unlocked_ioctl = rf_ioctl,
.release = rf_release,
};
static int rf_statistics_thread(void *data)
{
struct rf_data *rf = data;
u8 pldsiz;
unsigned long tx_dif, rx_dif;
read_reg(rf->spi, RX_PW_P0_REG, &pldsiz, 1);
/* do the first read */
tx_dif = rf->txcount;
rx_dif = rf->rxcount;
msleep(1000);
/* do first read */
while (!kthread_should_stop()) {
rf->tx_kbps = (rf->txcount - tx_dif) * pldsiz * 8 / 1000;
rf->rx_kbps = (rf->rxcount - rx_dif) * pldsiz * 8 / 1000;
tx_dif = rf->txcount;
rx_dif = rf->rxcount;
msleep(1000); /* wait one sec */
}
return 0;
}
/*
* Driver operations
*/
static int rf_probe(struct spi_device *spi)
{
int status;
unsigned long minor;
struct device *devp;
struct rf_data *rf;
struct device_node *np = spi->dev.of_node;
int gpio_irq;
_DEBUG("");
if (!np)
return -ENODEV;
rf = kzalloc(sizeof (struct rf_data), GFP_KERNEL);
if (!rf)
return -ENOMEM;
rf->spi = spi;
rf->new_rx_data = 0;
rf->gpio_ce = of_get_named_gpio(np, "gpio-ce", 0);
if (rf->gpio_ce < 0)
return -ENODEV;
INIT_LIST_HEAD(&rf->device_entry);
mutex_init(&rf->bus_lock);
init_completion(&rf->tx_complete);
init_waitqueue_head(&rf->rx_wq);
scnprintf(rf->devname, DEVNAME_MAX, "nrf24-%d.%d", spi->master->bus_num, spi->chip_select);
gpio_irq = of_get_named_gpio(np, "gpio-irq", 0);
spi->irq = gpio_to_irq(gpio_irq);
if (spi->irq < 0)
return -ENODEV;
spi_setup(spi);
spi_set_drvdata(spi, rf);
status = request_threaded_irq(spi->irq, rf_hard_irq, rf_irq, IRQF_TRIGGER_FALLING, rf->devname, rf);
if (status)
goto kfree_out;
status = gpio_request(rf->gpio_ce, rf->devname);
if (status)
goto free_irq_out;
gpio_direction_output(rf->gpio_ce, 0);
/* Default setup */
write_reg(spi, EN_AA_REG, "\x00", 1); /* Disable autoack for faster IRQ */
write_reg(spi, RX_PW_P0_REG, "\x20", 1); /* setup 32bytes of payload by default */
write_reg(spi, STATUS_REG, "\x70", 1); /* Reset status register */
write_reg(spi, RF_SETUP_REG, "\x26", 1); /* setup speed & ouput power */
write_reg(spi, EN_RXADDR_REG, "\x01", 1); /* enable only data pipe 0 */
disable_irqs(spi); /* disable irqs (are enabled on transmitting/receiving */
/* Sysfs attributes */
status = sysfs_create_group(&spi->dev.kobj, &rf_attr_group);
if (status)
goto gpio_free_out;
/* Statistics */
rf->statistics_tsk = kthread_run(rf_statistics_thread, rf, "nrf24-statistics");
if (!rf->statistics_tsk) {
status = -ENODEV;
goto sysfs_out;
}
/* Device creation */
mutex_lock(&device_list_lock);
minor = find_first_zero_bit(minors, N_SPI_MINORS);
if (minor > N_SPI_MINORS) {
mutex_unlock(&device_list_lock);
status = -ENODEV;
goto stop_stat_thread;
}
rf->devt = MKDEV(MAJOR(rf_devt), MINOR(minor));
devp = device_create(rf_class, &spi->dev, rf->devt, rf, "%s", rf->devname);
if (IS_ERR(devp)) {
mutex_unlock(&device_list_lock);
status = PTR_ERR(devp);
goto stop_stat_thread;
}
set_bit(minor, minors);
list_add(&rf->device_entry, &device_list);
mutex_unlock(&device_list_lock);
return 0;
stop_stat_thread:
kthread_stop(rf->statistics_tsk);
sysfs_out:
sysfs_remove_group(&spi->dev.kobj, &rf_attr_group);
gpio_free_out:
gpio_free(rf->gpio_ce);
free_irq_out:
free_irq(spi->irq, rf);
kfree_out:
kfree(rf);
return status;
}
static int rf_remove(struct spi_device *spi)
{
struct rf_data *rf = spi_get_drvdata(spi);
_DEBUG("");
BUG_ON(!rf);
kthread_stop(rf->statistics_tsk);
mutex_lock(&device_list_lock);
list_del(&rf->device_entry);
clear_bit(MINOR(rf->devt), minors);
device_destroy(rf_class, rf->devt);
spi_set_drvdata(spi, NULL);
mutex_unlock(&device_list_lock);
free_irq(spi->irq, rf);
gpio_free(rf->gpio_ce);
sysfs_remove_group(&spi->dev.kobj, &rf_attr_group);
kfree(rf);
return 0;
}
static const struct of_device_id rf_of_ids[] = {
{ .compatible = "nrf24" },
{},
};
static struct spi_driver rf_driver = {
.driver = {
.name = "nrf24",
.owner = THIS_MODULE,
.of_match_table = rf_of_ids,
},
.probe = rf_probe,
.remove = rf_remove,
};
static int __init rf_init(void)
{
int status;
_DEBUG("");
status = alloc_chrdev_region(&rf_devt, 0, N_SPI_MINORS, "nrf24");
if (status)
return status;
cdev_init(&rf_cdev, &fops);
status = cdev_add(&rf_cdev, rf_devt, N_SPI_MINORS);
if (status)
goto unregister_chrdev_region_out;
rf_class = class_create(THIS_MODULE, "nrf24");
if (IS_ERR(rf_class)) {
status = PTR_ERR(rf_class);
goto cdev_del_out;
}
status = spi_register_driver(&rf_driver);
if (status)
goto class_destroy_out;
return 0;
class_destroy_out:
class_destroy(rf_class);
cdev_del_out:
cdev_del(&rf_cdev);
unregister_chrdev_region_out:
unregister_chrdev_region(rf_devt, N_SPI_MINORS);
return status;
}
static void __exit rf_exit(void)
{
_DEBUG("");
spi_unregister_driver(&rf_driver);
class_destroy(rf_class);
cdev_del(&rf_cdev);
unregister_chrdev_region(rf_devt, N_SPI_MINORS);
}
module_init(rf_init);
module_exit(rf_exit);
MODULE_AUTHOR("Daniel Hilst Selli <danielhilst@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("nRF24L01+ Driver");