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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Turris Mox module configuration bus driver
4 *
5 * Copyright (C) 2019 Marek Behún <kabel@kernel.org>
6 */
7
8#include <dt-bindings/bus/moxtet.h>
9#include <linux/bitops.h>
10#include <linux/debugfs.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/moxtet.h>
14#include <linux/mutex.h>
15#include <linux/of_device.h>
16#include <linux/of_irq.h>
17#include <linux/spi/spi.h>
18
19/*
20 * @name: module name for sysfs
21 * @hwirq_base: base index for IRQ for this module (-1 if no IRQs)
22 * @nirqs: how many interrupts does the shift register provide
23 * @desc: module description for kernel log
24 */
25static const struct {
26 const char *name;
27 int hwirq_base;
28 int nirqs;
29 const char *desc;
30} mox_module_table[] = {
31 /* do not change order of this array! */
32 { NULL, 0, 0, NULL },
33 { "sfp", -1, 0, "MOX D (SFP cage)" },
34 { "pci", MOXTET_IRQ_PCI, 1, "MOX B (Mini-PCIe)" },
35 { "topaz", MOXTET_IRQ_TOPAZ, 1, "MOX C (4 port switch)" },
36 { "peridot", MOXTET_IRQ_PERIDOT(0), 1, "MOX E (8 port switch)" },
37 { "usb3", MOXTET_IRQ_USB3, 2, "MOX F (USB 3.0)" },
38 { "pci-bridge", -1, 0, "MOX G (Mini-PCIe bridge)" },
39};
40
41static inline bool mox_module_known(unsigned int id)
42{
43 return id >= TURRIS_MOX_MODULE_FIRST && id <= TURRIS_MOX_MODULE_LAST;
44}
45
46static inline const char *mox_module_name(unsigned int id)
47{
48 if (mox_module_known(id))
49 return mox_module_table[id].name;
50 else
51 return "unknown";
52}
53
54#define DEF_MODULE_ATTR(name, fmt, ...) \
55static ssize_t \
56module_##name##_show(struct device *dev, struct device_attribute *a, \
57 char *buf) \
58{ \
59 struct moxtet_device *mdev = to_moxtet_device(dev); \
60 return sprintf(buf, (fmt), __VA_ARGS__); \
61} \
62static DEVICE_ATTR_RO(module_##name)
63
64DEF_MODULE_ATTR(id, "0x%x\n", mdev->id);
65DEF_MODULE_ATTR(name, "%s\n", mox_module_name(mdev->id));
66DEF_MODULE_ATTR(description, "%s\n",
67 mox_module_known(mdev->id) ? mox_module_table[mdev->id].desc
68 : "");
69
70static struct attribute *moxtet_dev_attrs[] = {
71 &dev_attr_module_id.attr,
72 &dev_attr_module_name.attr,
73 &dev_attr_module_description.attr,
74 NULL,
75};
76
77static const struct attribute_group moxtet_dev_group = {
78 .attrs = moxtet_dev_attrs,
79};
80
81static const struct attribute_group *moxtet_dev_groups[] = {
82 &moxtet_dev_group,
83 NULL,
84};
85
86static int moxtet_match(struct device *dev, const struct device_driver *drv)
87{
88 struct moxtet_device *mdev = to_moxtet_device(dev);
89 const struct moxtet_driver *tdrv = to_moxtet_driver(drv);
90 const enum turris_mox_module_id *t;
91
92 if (of_driver_match_device(dev, drv))
93 return 1;
94
95 if (!tdrv->id_table)
96 return 0;
97
98 for (t = tdrv->id_table; *t; ++t)
99 if (*t == mdev->id)
100 return 1;
101
102 return 0;
103}
104
105static const struct bus_type moxtet_bus_type = {
106 .name = "moxtet",
107 .dev_groups = moxtet_dev_groups,
108 .match = moxtet_match,
109};
110
111int __moxtet_register_driver(struct module *owner,
112 struct moxtet_driver *mdrv)
113{
114 mdrv->driver.owner = owner;
115 mdrv->driver.bus = &moxtet_bus_type;
116 return driver_register(&mdrv->driver);
117}
118EXPORT_SYMBOL_GPL(__moxtet_register_driver);
119
120static int moxtet_dev_check(struct device *dev, void *data)
121{
122 struct moxtet_device *mdev = to_moxtet_device(dev);
123 struct moxtet_device *new_dev = data;
124
125 if (mdev->moxtet == new_dev->moxtet && mdev->id == new_dev->id &&
126 mdev->idx == new_dev->idx)
127 return -EBUSY;
128 return 0;
129}
130
131static void moxtet_dev_release(struct device *dev)
132{
133 struct moxtet_device *mdev = to_moxtet_device(dev);
134
135 put_device(mdev->moxtet->dev);
136 kfree(mdev);
137}
138
139static struct moxtet_device *
140moxtet_alloc_device(struct moxtet *moxtet)
141{
142 struct moxtet_device *dev;
143
144 if (!get_device(moxtet->dev))
145 return NULL;
146
147 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
148 if (!dev) {
149 put_device(moxtet->dev);
150 return NULL;
151 }
152
153 dev->moxtet = moxtet;
154 dev->dev.parent = moxtet->dev;
155 dev->dev.bus = &moxtet_bus_type;
156 dev->dev.release = moxtet_dev_release;
157
158 device_initialize(&dev->dev);
159
160 return dev;
161}
162
163static int moxtet_add_device(struct moxtet_device *dev)
164{
165 static DEFINE_MUTEX(add_mutex);
166 int ret;
167
168 if (dev->idx >= TURRIS_MOX_MAX_MODULES || dev->id > 0xf)
169 return -EINVAL;
170
171 dev_set_name(&dev->dev, "moxtet-%s.%u", mox_module_name(dev->id),
172 dev->idx);
173
174 mutex_lock(&add_mutex);
175
176 ret = bus_for_each_dev(&moxtet_bus_type, NULL, dev,
177 moxtet_dev_check);
178 if (ret)
179 goto done;
180
181 ret = device_add(&dev->dev);
182 if (ret < 0)
183 dev_err(dev->moxtet->dev, "can't add %s, status %d\n",
184 dev_name(dev->moxtet->dev), ret);
185
186done:
187 mutex_unlock(&add_mutex);
188 return ret;
189}
190
191static int __unregister(struct device *dev, void *null)
192{
193 if (dev->of_node) {
194 of_node_clear_flag(dev->of_node, OF_POPULATED);
195 of_node_put(dev->of_node);
196 }
197
198 device_unregister(dev);
199
200 return 0;
201}
202
203static struct moxtet_device *
204of_register_moxtet_device(struct moxtet *moxtet, struct device_node *nc)
205{
206 struct moxtet_device *dev;
207 u32 val;
208 int ret;
209
210 dev = moxtet_alloc_device(moxtet);
211 if (!dev) {
212 dev_err(moxtet->dev,
213 "Moxtet device alloc error for %pOF\n", nc);
214 return ERR_PTR(-ENOMEM);
215 }
216
217 ret = of_property_read_u32(nc, "reg", &val);
218 if (ret) {
219 dev_err(moxtet->dev, "%pOF has no valid 'reg' property (%d)\n",
220 nc, ret);
221 goto err_put;
222 }
223
224 dev->idx = val;
225
226 if (dev->idx >= TURRIS_MOX_MAX_MODULES) {
227 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x out of range\n",
228 nc, dev->idx);
229 ret = -EINVAL;
230 goto err_put;
231 }
232
233 dev->id = moxtet->modules[dev->idx];
234
235 if (!dev->id) {
236 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x is empty\n", nc,
237 dev->idx);
238 ret = -ENODEV;
239 goto err_put;
240 }
241
242 of_node_get(nc);
243 dev->dev.of_node = nc;
244
245 ret = moxtet_add_device(dev);
246 if (ret) {
247 dev_err(moxtet->dev,
248 "Moxtet device register error for %pOF\n", nc);
249 of_node_put(nc);
250 goto err_put;
251 }
252
253 return dev;
254
255err_put:
256 put_device(&dev->dev);
257 return ERR_PTR(ret);
258}
259
260static void of_register_moxtet_devices(struct moxtet *moxtet)
261{
262 struct moxtet_device *dev;
263 struct device_node *nc;
264
265 if (!moxtet->dev->of_node)
266 return;
267
268 for_each_available_child_of_node(moxtet->dev->of_node, nc) {
269 if (of_node_test_and_set_flag(nc, OF_POPULATED))
270 continue;
271 dev = of_register_moxtet_device(moxtet, nc);
272 if (IS_ERR(dev)) {
273 dev_warn(moxtet->dev,
274 "Failed to create Moxtet device for %pOF\n",
275 nc);
276 of_node_clear_flag(nc, OF_POPULATED);
277 }
278 }
279}
280
281static void
282moxtet_register_devices_from_topology(struct moxtet *moxtet)
283{
284 struct moxtet_device *dev;
285 int i, ret;
286
287 for (i = 0; i < moxtet->count; ++i) {
288 dev = moxtet_alloc_device(moxtet);
289 if (!dev) {
290 dev_err(moxtet->dev, "Moxtet device %u alloc error\n",
291 i);
292 continue;
293 }
294
295 dev->idx = i;
296 dev->id = moxtet->modules[i];
297
298 ret = moxtet_add_device(dev);
299 if (ret && ret != -EBUSY) {
300 put_device(&dev->dev);
301 dev_err(moxtet->dev,
302 "Moxtet device %u register error: %i\n", i,
303 ret);
304 }
305 }
306}
307
308/*
309 * @nsame: how many modules with same id are already in moxtet->modules
310 */
311static int moxtet_set_irq(struct moxtet *moxtet, int idx, int id, int nsame)
312{
313 int i, first;
314 struct moxtet_irqpos *pos;
315
316 first = mox_module_table[id].hwirq_base +
317 nsame * mox_module_table[id].nirqs;
318
319 if (first + mox_module_table[id].nirqs > MOXTET_NIRQS)
320 return -EINVAL;
321
322 for (i = 0; i < mox_module_table[id].nirqs; ++i) {
323 pos = &moxtet->irq.position[first + i];
324 pos->idx = idx;
325 pos->bit = i;
326 moxtet->irq.exists |= BIT(first + i);
327 }
328
329 return 0;
330}
331
332static int moxtet_find_topology(struct moxtet *moxtet)
333{
334 u8 buf[TURRIS_MOX_MAX_MODULES];
335 int cnts[TURRIS_MOX_MODULE_LAST];
336 int i, ret;
337
338 memset(cnts, 0, sizeof(cnts));
339
340 ret = spi_read(to_spi_device(moxtet->dev), buf, TURRIS_MOX_MAX_MODULES);
341 if (ret < 0)
342 return ret;
343
344 if (buf[0] == TURRIS_MOX_CPU_ID_EMMC) {
345 dev_info(moxtet->dev, "Found MOX A (eMMC CPU) module\n");
346 } else if (buf[0] == TURRIS_MOX_CPU_ID_SD) {
347 dev_info(moxtet->dev, "Found MOX A (CPU) module\n");
348 } else {
349 dev_err(moxtet->dev, "Invalid Turris MOX A CPU module 0x%02x\n",
350 buf[0]);
351 return -ENODEV;
352 }
353
354 moxtet->count = 0;
355
356 for (i = 1; i < TURRIS_MOX_MAX_MODULES; ++i) {
357 int id;
358
359 if (buf[i] == 0xff)
360 break;
361
362 id = buf[i] & 0xf;
363
364 moxtet->modules[i-1] = id;
365 ++moxtet->count;
366
367 if (mox_module_known(id)) {
368 dev_info(moxtet->dev, "Found %s module\n",
369 mox_module_table[id].desc);
370
371 if (moxtet_set_irq(moxtet, i-1, id, cnts[id]++) < 0)
372 dev_err(moxtet->dev,
373 " Cannot set IRQ for module %s\n",
374 mox_module_table[id].desc);
375 } else {
376 dev_warn(moxtet->dev,
377 "Unknown Moxtet module found (ID 0x%02x)\n",
378 id);
379 }
380 }
381
382 return 0;
383}
384
385static int moxtet_spi_read(struct moxtet *moxtet, u8 *buf)
386{
387 struct spi_transfer xfer = {
388 .rx_buf = buf,
389 .tx_buf = moxtet->tx,
390 .len = moxtet->count + 1
391 };
392 int ret;
393
394 mutex_lock(&moxtet->lock);
395
396 ret = spi_sync_transfer(to_spi_device(moxtet->dev), &xfer, 1);
397
398 mutex_unlock(&moxtet->lock);
399
400 return ret;
401}
402
403int moxtet_device_read(struct device *dev)
404{
405 struct moxtet_device *mdev = to_moxtet_device(dev);
406 struct moxtet *moxtet = mdev->moxtet;
407 u8 buf[TURRIS_MOX_MAX_MODULES];
408 int ret;
409
410 if (mdev->idx >= moxtet->count)
411 return -EINVAL;
412
413 ret = moxtet_spi_read(moxtet, buf);
414 if (ret < 0)
415 return ret;
416
417 return buf[mdev->idx + 1] >> 4;
418}
419EXPORT_SYMBOL_GPL(moxtet_device_read);
420
421int moxtet_device_write(struct device *dev, u8 val)
422{
423 struct moxtet_device *mdev = to_moxtet_device(dev);
424 struct moxtet *moxtet = mdev->moxtet;
425 int ret;
426
427 if (mdev->idx >= moxtet->count)
428 return -EINVAL;
429
430 mutex_lock(&moxtet->lock);
431
432 moxtet->tx[moxtet->count - mdev->idx] = val;
433
434 ret = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
435 moxtet->count + 1);
436
437 mutex_unlock(&moxtet->lock);
438
439 return ret;
440}
441EXPORT_SYMBOL_GPL(moxtet_device_write);
442
443int moxtet_device_written(struct device *dev)
444{
445 struct moxtet_device *mdev = to_moxtet_device(dev);
446 struct moxtet *moxtet = mdev->moxtet;
447
448 if (mdev->idx >= moxtet->count)
449 return -EINVAL;
450
451 return moxtet->tx[moxtet->count - mdev->idx];
452}
453EXPORT_SYMBOL_GPL(moxtet_device_written);
454
455#ifdef CONFIG_DEBUG_FS
456static int moxtet_debug_open(struct inode *inode, struct file *file)
457{
458 file->private_data = inode->i_private;
459
460 return nonseekable_open(inode, file);
461}
462
463static ssize_t input_read(struct file *file, char __user *buf, size_t len,
464 loff_t *ppos)
465{
466 struct moxtet *moxtet = file->private_data;
467 u8 bin[TURRIS_MOX_MAX_MODULES];
468 u8 hex[sizeof(bin) * 2 + 1];
469 int ret, n;
470
471 ret = moxtet_spi_read(moxtet, bin);
472 if (ret < 0)
473 return ret;
474
475 n = moxtet->count + 1;
476 bin2hex(hex, bin, n);
477
478 hex[2*n] = '\n';
479
480 return simple_read_from_buffer(buf, len, ppos, hex, 2*n + 1);
481}
482
483static const struct file_operations input_fops = {
484 .owner = THIS_MODULE,
485 .open = moxtet_debug_open,
486 .read = input_read,
487};
488
489static ssize_t output_read(struct file *file, char __user *buf, size_t len,
490 loff_t *ppos)
491{
492 struct moxtet *moxtet = file->private_data;
493 u8 hex[TURRIS_MOX_MAX_MODULES * 2 + 1];
494 u8 *p = hex;
495 int i;
496
497 mutex_lock(&moxtet->lock);
498
499 for (i = 0; i < moxtet->count; ++i)
500 p = hex_byte_pack(p, moxtet->tx[moxtet->count - i]);
501
502 mutex_unlock(&moxtet->lock);
503
504 *p++ = '\n';
505
506 return simple_read_from_buffer(buf, len, ppos, hex, p - hex);
507}
508
509static ssize_t output_write(struct file *file, const char __user *buf,
510 size_t len, loff_t *ppos)
511{
512 struct moxtet *moxtet = file->private_data;
513 u8 bin[TURRIS_MOX_MAX_MODULES];
514 u8 hex[sizeof(bin) * 2 + 1];
515 ssize_t res;
516 loff_t dummy = 0;
517 int err, i;
518
519 if (len > 2 * moxtet->count + 1 || len < 2 * moxtet->count)
520 return -EINVAL;
521
522 res = simple_write_to_buffer(hex, sizeof(hex), &dummy, buf, len);
523 if (res < 0)
524 return res;
525
526 if (len % 2 == 1 && hex[len - 1] != '\n')
527 return -EINVAL;
528
529 err = hex2bin(bin, hex, moxtet->count);
530 if (err < 0)
531 return -EINVAL;
532
533 mutex_lock(&moxtet->lock);
534
535 for (i = 0; i < moxtet->count; ++i)
536 moxtet->tx[moxtet->count - i] = bin[i];
537
538 err = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
539 moxtet->count + 1);
540
541 mutex_unlock(&moxtet->lock);
542
543 return err < 0 ? err : len;
544}
545
546static const struct file_operations output_fops = {
547 .owner = THIS_MODULE,
548 .open = moxtet_debug_open,
549 .read = output_read,
550 .write = output_write,
551};
552
553static int moxtet_register_debugfs(struct moxtet *moxtet)
554{
555 struct dentry *root, *entry;
556
557 root = debugfs_create_dir("moxtet", NULL);
558
559 if (IS_ERR(root))
560 return PTR_ERR(root);
561
562 entry = debugfs_create_file_unsafe("input", 0444, root, moxtet,
563 &input_fops);
564 if (IS_ERR(entry))
565 goto err_remove;
566
567 entry = debugfs_create_file_unsafe("output", 0644, root, moxtet,
568 &output_fops);
569 if (IS_ERR(entry))
570 goto err_remove;
571
572 moxtet->debugfs_root = root;
573
574 return 0;
575err_remove:
576 debugfs_remove_recursive(root);
577 return PTR_ERR(entry);
578}
579
580static void moxtet_unregister_debugfs(struct moxtet *moxtet)
581{
582 debugfs_remove_recursive(moxtet->debugfs_root);
583}
584#else
585static inline int moxtet_register_debugfs(struct moxtet *moxtet)
586{
587 return 0;
588}
589
590static inline void moxtet_unregister_debugfs(struct moxtet *moxtet)
591{
592}
593#endif
594
595static int moxtet_irq_domain_map(struct irq_domain *d, unsigned int irq,
596 irq_hw_number_t hw)
597{
598 struct moxtet *moxtet = d->host_data;
599
600 if (hw >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(hw))) {
601 dev_err(moxtet->dev, "Invalid hw irq number\n");
602 return -EINVAL;
603 }
604
605 irq_set_chip_data(irq, d->host_data);
606 irq_set_chip_and_handler(irq, &moxtet->irq.chip, handle_level_irq);
607
608 return 0;
609}
610
611static int moxtet_irq_domain_xlate(struct irq_domain *d,
612 struct device_node *ctrlr,
613 const u32 *intspec, unsigned int intsize,
614 unsigned long *out_hwirq,
615 unsigned int *out_type)
616{
617 struct moxtet *moxtet = d->host_data;
618 int irq;
619
620 if (WARN_ON(intsize < 1))
621 return -EINVAL;
622
623 irq = intspec[0];
624
625 if (irq >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(irq)))
626 return -EINVAL;
627
628 *out_hwirq = irq;
629 *out_type = IRQ_TYPE_NONE;
630 return 0;
631}
632
633static const struct irq_domain_ops moxtet_irq_domain = {
634 .map = moxtet_irq_domain_map,
635 .xlate = moxtet_irq_domain_xlate,
636};
637
638static void moxtet_irq_mask(struct irq_data *d)
639{
640 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
641
642 moxtet->irq.masked |= BIT(d->hwirq);
643}
644
645static void moxtet_irq_unmask(struct irq_data *d)
646{
647 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
648
649 moxtet->irq.masked &= ~BIT(d->hwirq);
650}
651
652static void moxtet_irq_print_chip(struct irq_data *d, struct seq_file *p)
653{
654 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
655 struct moxtet_irqpos *pos = &moxtet->irq.position[d->hwirq];
656 int id;
657
658 id = moxtet->modules[pos->idx];
659
660 seq_printf(p, "moxtet-%s.%i#%i", mox_module_name(id), pos->idx,
661 pos->bit);
662}
663
664static const struct irq_chip moxtet_irq_chip = {
665 .name = "moxtet",
666 .irq_mask = moxtet_irq_mask,
667 .irq_unmask = moxtet_irq_unmask,
668 .irq_print_chip = moxtet_irq_print_chip,
669};
670
671static int moxtet_irq_read(struct moxtet *moxtet, unsigned long *map)
672{
673 struct moxtet_irqpos *pos = moxtet->irq.position;
674 u8 buf[TURRIS_MOX_MAX_MODULES];
675 int i, ret;
676
677 ret = moxtet_spi_read(moxtet, buf);
678 if (ret < 0)
679 return ret;
680
681 *map = 0;
682
683 for_each_set_bit(i, &moxtet->irq.exists, MOXTET_NIRQS) {
684 if (!(buf[pos[i].idx + 1] & BIT(4 + pos[i].bit)))
685 set_bit(i, map);
686 }
687
688 return 0;
689}
690
691static irqreturn_t moxtet_irq_thread_fn(int irq, void *data)
692{
693 struct moxtet *moxtet = data;
694 unsigned long set;
695 int nhandled = 0, i, sub_irq, ret;
696
697 ret = moxtet_irq_read(moxtet, &set);
698 if (ret < 0)
699 goto out;
700
701 set &= ~moxtet->irq.masked;
702
703 do {
704 for_each_set_bit(i, &set, MOXTET_NIRQS) {
705 sub_irq = irq_find_mapping(moxtet->irq.domain, i);
706 handle_nested_irq(sub_irq);
707 dev_dbg(moxtet->dev, "%i irq\n", i);
708 ++nhandled;
709 }
710
711 ret = moxtet_irq_read(moxtet, &set);
712 if (ret < 0)
713 goto out;
714
715 set &= ~moxtet->irq.masked;
716 } while (set);
717
718out:
719 return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
720}
721
722static void moxtet_irq_free(struct moxtet *moxtet)
723{
724 int i, irq;
725
726 for (i = 0; i < MOXTET_NIRQS; ++i) {
727 if (moxtet->irq.exists & BIT(i)) {
728 irq = irq_find_mapping(moxtet->irq.domain, i);
729 irq_dispose_mapping(irq);
730 }
731 }
732
733 irq_domain_remove(moxtet->irq.domain);
734}
735
736static int moxtet_irq_setup(struct moxtet *moxtet)
737{
738 int i, ret;
739
740 moxtet->irq.domain = irq_domain_add_simple(moxtet->dev->of_node,
741 MOXTET_NIRQS, 0,
742 &moxtet_irq_domain, moxtet);
743 if (moxtet->irq.domain == NULL) {
744 dev_err(moxtet->dev, "Could not add IRQ domain\n");
745 return -ENOMEM;
746 }
747
748 for (i = 0; i < MOXTET_NIRQS; ++i)
749 if (moxtet->irq.exists & BIT(i))
750 irq_create_mapping(moxtet->irq.domain, i);
751
752 moxtet->irq.chip = moxtet_irq_chip;
753 moxtet->irq.masked = ~0;
754
755 ret = request_threaded_irq(moxtet->dev_irq, NULL, moxtet_irq_thread_fn,
756 IRQF_SHARED | IRQF_ONESHOT, "moxtet", moxtet);
757 if (ret < 0)
758 goto err_free;
759
760 return 0;
761
762err_free:
763 moxtet_irq_free(moxtet);
764 return ret;
765}
766
767static int moxtet_probe(struct spi_device *spi)
768{
769 struct moxtet *moxtet;
770 int ret;
771
772 ret = spi_setup(spi);
773 if (ret < 0)
774 return ret;
775
776 moxtet = devm_kzalloc(&spi->dev, sizeof(struct moxtet),
777 GFP_KERNEL);
778 if (!moxtet)
779 return -ENOMEM;
780
781 moxtet->dev = &spi->dev;
782 spi_set_drvdata(spi, moxtet);
783
784 mutex_init(&moxtet->lock);
785
786 moxtet->dev_irq = of_irq_get(moxtet->dev->of_node, 0);
787 if (moxtet->dev_irq == -EPROBE_DEFER)
788 return -EPROBE_DEFER;
789
790 if (moxtet->dev_irq <= 0) {
791 dev_err(moxtet->dev, "No IRQ resource found\n");
792 return -ENXIO;
793 }
794
795 ret = moxtet_find_topology(moxtet);
796 if (ret < 0)
797 return ret;
798
799 if (moxtet->irq.exists) {
800 ret = moxtet_irq_setup(moxtet);
801 if (ret < 0)
802 return ret;
803 }
804
805 of_register_moxtet_devices(moxtet);
806 moxtet_register_devices_from_topology(moxtet);
807
808 ret = moxtet_register_debugfs(moxtet);
809 if (ret < 0)
810 dev_warn(moxtet->dev, "Failed creating debugfs entries: %i\n",
811 ret);
812
813 return 0;
814}
815
816static void moxtet_remove(struct spi_device *spi)
817{
818 struct moxtet *moxtet = spi_get_drvdata(spi);
819
820 free_irq(moxtet->dev_irq, moxtet);
821
822 moxtet_irq_free(moxtet);
823
824 moxtet_unregister_debugfs(moxtet);
825
826 device_for_each_child(moxtet->dev, NULL, __unregister);
827
828 mutex_destroy(&moxtet->lock);
829}
830
831static const struct spi_device_id moxtet_spi_ids[] = {
832 { "moxtet" },
833 { },
834};
835MODULE_DEVICE_TABLE(spi, moxtet_spi_ids);
836
837static const struct of_device_id moxtet_dt_ids[] = {
838 { .compatible = "cznic,moxtet" },
839 {},
840};
841MODULE_DEVICE_TABLE(of, moxtet_dt_ids);
842
843static struct spi_driver moxtet_spi_driver = {
844 .driver = {
845 .name = "moxtet",
846 .of_match_table = moxtet_dt_ids,
847 },
848 .id_table = moxtet_spi_ids,
849 .probe = moxtet_probe,
850 .remove = moxtet_remove,
851};
852
853static int __init moxtet_init(void)
854{
855 int ret;
856
857 ret = bus_register(&moxtet_bus_type);
858 if (ret < 0) {
859 pr_err("moxtet bus registration failed: %d\n", ret);
860 goto error;
861 }
862
863 ret = spi_register_driver(&moxtet_spi_driver);
864 if (ret < 0) {
865 pr_err("moxtet spi driver registration failed: %d\n", ret);
866 goto error_bus;
867 }
868
869 return 0;
870
871error_bus:
872 bus_unregister(&moxtet_bus_type);
873error:
874 return ret;
875}
876postcore_initcall_sync(moxtet_init);
877
878static void __exit moxtet_exit(void)
879{
880 spi_unregister_driver(&moxtet_spi_driver);
881 bus_unregister(&moxtet_bus_type);
882}
883module_exit(moxtet_exit);
884
885MODULE_AUTHOR("Marek Behun <kabel@kernel.org>");
886MODULE_DESCRIPTION("CZ.NIC's Turris Mox module configuration bus");
887MODULE_LICENSE("GPL v2");