1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | // |
3 | // GPIO Aggregator |
4 | // |
5 | // Copyright (C) 2019-2020 Glider bv |
6 | |
7 | #define DRV_NAME "gpio-aggregator" |
8 | #define pr_fmt(fmt) DRV_NAME ": " fmt |
9 | |
10 | #include <linux/bitmap.h> |
11 | #include <linux/bitops.h> |
12 | #include <linux/ctype.h> |
13 | #include <linux/delay.h> |
14 | #include <linux/idr.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/mod_devicetable.h> |
17 | #include <linux/module.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/overflow.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/property.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/spinlock.h> |
24 | #include <linux/string.h> |
25 | |
26 | #include <linux/gpio/consumer.h> |
27 | #include <linux/gpio/driver.h> |
28 | #include <linux/gpio/machine.h> |
29 | |
30 | #define AGGREGATOR_MAX_GPIOS 512 |
31 | |
32 | /* |
33 | * GPIO Aggregator sysfs interface |
34 | */ |
35 | |
36 | struct gpio_aggregator { |
37 | struct gpiod_lookup_table *lookups; |
38 | struct platform_device *pdev; |
39 | char args[]; |
40 | }; |
41 | |
42 | static DEFINE_MUTEX(gpio_aggregator_lock); /* protects idr */ |
43 | static DEFINE_IDR(gpio_aggregator_idr); |
44 | |
45 | static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key, |
46 | int hwnum, unsigned int *n) |
47 | { |
48 | struct gpiod_lookup_table *lookups; |
49 | |
50 | lookups = krealloc(objp: aggr->lookups, struct_size(lookups, table, *n + 2), |
51 | GFP_KERNEL); |
52 | if (!lookups) |
53 | return -ENOMEM; |
54 | |
55 | lookups->table[*n] = GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0); |
56 | |
57 | (*n)++; |
58 | memset(&lookups->table[*n], 0, sizeof(lookups->table[*n])); |
59 | |
60 | aggr->lookups = lookups; |
61 | return 0; |
62 | } |
63 | |
64 | static int aggr_parse(struct gpio_aggregator *aggr) |
65 | { |
66 | char *args = skip_spaces(aggr->args); |
67 | char *name, *offsets, *p; |
68 | unsigned long *bitmap; |
69 | unsigned int i, n = 0; |
70 | int error = 0; |
71 | |
72 | bitmap = bitmap_alloc(AGGREGATOR_MAX_GPIOS, GFP_KERNEL); |
73 | if (!bitmap) |
74 | return -ENOMEM; |
75 | |
76 | args = next_arg(args, param: &name, val: &p); |
77 | while (*args) { |
78 | args = next_arg(args, param: &offsets, val: &p); |
79 | |
80 | p = get_options(str: offsets, nints: 0, ints: &error); |
81 | if (error == 0 || *p) { |
82 | /* Named GPIO line */ |
83 | error = aggr_add_gpio(aggr, key: name, U16_MAX, n: &n); |
84 | if (error) |
85 | goto free_bitmap; |
86 | |
87 | name = offsets; |
88 | continue; |
89 | } |
90 | |
91 | /* GPIO chip + offset(s) */ |
92 | error = bitmap_parselist(buf: offsets, maskp: bitmap, AGGREGATOR_MAX_GPIOS); |
93 | if (error) { |
94 | pr_err("Cannot parse %s: %d\n" , offsets, error); |
95 | goto free_bitmap; |
96 | } |
97 | |
98 | for_each_set_bit(i, bitmap, AGGREGATOR_MAX_GPIOS) { |
99 | error = aggr_add_gpio(aggr, key: name, hwnum: i, n: &n); |
100 | if (error) |
101 | goto free_bitmap; |
102 | } |
103 | |
104 | args = next_arg(args, param: &name, val: &p); |
105 | } |
106 | |
107 | if (!n) { |
108 | pr_err("No GPIOs specified\n" ); |
109 | error = -EINVAL; |
110 | } |
111 | |
112 | free_bitmap: |
113 | bitmap_free(bitmap); |
114 | return error; |
115 | } |
116 | |
117 | static ssize_t new_device_store(struct device_driver *driver, const char *buf, |
118 | size_t count) |
119 | { |
120 | struct gpio_aggregator *aggr; |
121 | struct platform_device *pdev; |
122 | int res, id; |
123 | |
124 | /* kernfs guarantees string termination, so count + 1 is safe */ |
125 | aggr = kzalloc(size: sizeof(*aggr) + count + 1, GFP_KERNEL); |
126 | if (!aggr) |
127 | return -ENOMEM; |
128 | |
129 | memcpy(aggr->args, buf, count + 1); |
130 | |
131 | aggr->lookups = kzalloc(struct_size(aggr->lookups, table, 1), |
132 | GFP_KERNEL); |
133 | if (!aggr->lookups) { |
134 | res = -ENOMEM; |
135 | goto free_ga; |
136 | } |
137 | |
138 | mutex_lock(&gpio_aggregator_lock); |
139 | id = idr_alloc(&gpio_aggregator_idr, ptr: aggr, start: 0, end: 0, GFP_KERNEL); |
140 | mutex_unlock(lock: &gpio_aggregator_lock); |
141 | |
142 | if (id < 0) { |
143 | res = id; |
144 | goto free_table; |
145 | } |
146 | |
147 | aggr->lookups->dev_id = kasprintf(GFP_KERNEL, fmt: "%s.%d" , DRV_NAME, id); |
148 | if (!aggr->lookups->dev_id) { |
149 | res = -ENOMEM; |
150 | goto remove_idr; |
151 | } |
152 | |
153 | res = aggr_parse(aggr); |
154 | if (res) |
155 | goto free_dev_id; |
156 | |
157 | gpiod_add_lookup_table(table: aggr->lookups); |
158 | |
159 | pdev = platform_device_register_simple(DRV_NAME, id, NULL, num: 0); |
160 | if (IS_ERR(ptr: pdev)) { |
161 | res = PTR_ERR(ptr: pdev); |
162 | goto remove_table; |
163 | } |
164 | |
165 | aggr->pdev = pdev; |
166 | return count; |
167 | |
168 | remove_table: |
169 | gpiod_remove_lookup_table(table: aggr->lookups); |
170 | free_dev_id: |
171 | kfree(objp: aggr->lookups->dev_id); |
172 | remove_idr: |
173 | mutex_lock(&gpio_aggregator_lock); |
174 | idr_remove(&gpio_aggregator_idr, id); |
175 | mutex_unlock(lock: &gpio_aggregator_lock); |
176 | free_table: |
177 | kfree(objp: aggr->lookups); |
178 | free_ga: |
179 | kfree(objp: aggr); |
180 | return res; |
181 | } |
182 | |
183 | static DRIVER_ATTR_WO(new_device); |
184 | |
185 | static void gpio_aggregator_free(struct gpio_aggregator *aggr) |
186 | { |
187 | platform_device_unregister(aggr->pdev); |
188 | gpiod_remove_lookup_table(table: aggr->lookups); |
189 | kfree(objp: aggr->lookups->dev_id); |
190 | kfree(objp: aggr->lookups); |
191 | kfree(objp: aggr); |
192 | } |
193 | |
194 | static ssize_t delete_device_store(struct device_driver *driver, |
195 | const char *buf, size_t count) |
196 | { |
197 | struct gpio_aggregator *aggr; |
198 | unsigned int id; |
199 | int error; |
200 | |
201 | if (!str_has_prefix(str: buf, DRV_NAME "." )) |
202 | return -EINVAL; |
203 | |
204 | error = kstrtouint(s: buf + strlen(DRV_NAME "." ), base: 10, res: &id); |
205 | if (error) |
206 | return error; |
207 | |
208 | mutex_lock(&gpio_aggregator_lock); |
209 | aggr = idr_remove(&gpio_aggregator_idr, id); |
210 | mutex_unlock(lock: &gpio_aggregator_lock); |
211 | if (!aggr) |
212 | return -ENOENT; |
213 | |
214 | gpio_aggregator_free(aggr); |
215 | return count; |
216 | } |
217 | static DRIVER_ATTR_WO(delete_device); |
218 | |
219 | static struct attribute *gpio_aggregator_attrs[] = { |
220 | &driver_attr_new_device.attr, |
221 | &driver_attr_delete_device.attr, |
222 | NULL |
223 | }; |
224 | ATTRIBUTE_GROUPS(gpio_aggregator); |
225 | |
226 | static int __exit gpio_aggregator_idr_remove(int id, void *p, void *data) |
227 | { |
228 | gpio_aggregator_free(aggr: p); |
229 | return 0; |
230 | } |
231 | |
232 | static void __exit gpio_aggregator_remove_all(void) |
233 | { |
234 | mutex_lock(&gpio_aggregator_lock); |
235 | idr_for_each(&gpio_aggregator_idr, fn: gpio_aggregator_idr_remove, NULL); |
236 | idr_destroy(&gpio_aggregator_idr); |
237 | mutex_unlock(lock: &gpio_aggregator_lock); |
238 | } |
239 | |
240 | |
241 | /* |
242 | * GPIO Forwarder |
243 | */ |
244 | |
245 | struct gpiochip_fwd_timing { |
246 | u32 ramp_up_us; |
247 | u32 ramp_down_us; |
248 | }; |
249 | |
250 | struct gpiochip_fwd { |
251 | struct gpio_chip chip; |
252 | struct gpio_desc **descs; |
253 | union { |
254 | struct mutex mlock; /* protects tmp[] if can_sleep */ |
255 | spinlock_t slock; /* protects tmp[] if !can_sleep */ |
256 | }; |
257 | struct gpiochip_fwd_timing *delay_timings; |
258 | unsigned long tmp[]; /* values and descs for multiple ops */ |
259 | }; |
260 | |
261 | #define fwd_tmp_values(fwd) &(fwd)->tmp[0] |
262 | #define fwd_tmp_descs(fwd) (void *)&(fwd)->tmp[BITS_TO_LONGS((fwd)->chip.ngpio)] |
263 | |
264 | #define fwd_tmp_size(ngpios) (BITS_TO_LONGS((ngpios)) + (ngpios)) |
265 | |
266 | static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset) |
267 | { |
268 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
269 | |
270 | return gpiod_get_direction(desc: fwd->descs[offset]); |
271 | } |
272 | |
273 | static int gpio_fwd_direction_input(struct gpio_chip *chip, unsigned int offset) |
274 | { |
275 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
276 | |
277 | return gpiod_direction_input(desc: fwd->descs[offset]); |
278 | } |
279 | |
280 | static int gpio_fwd_direction_output(struct gpio_chip *chip, |
281 | unsigned int offset, int value) |
282 | { |
283 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
284 | |
285 | return gpiod_direction_output(desc: fwd->descs[offset], value); |
286 | } |
287 | |
288 | static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset) |
289 | { |
290 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
291 | |
292 | return chip->can_sleep ? gpiod_get_value_cansleep(desc: fwd->descs[offset]) |
293 | : gpiod_get_value(desc: fwd->descs[offset]); |
294 | } |
295 | |
296 | static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, |
297 | unsigned long *bits) |
298 | { |
299 | struct gpio_desc **descs = fwd_tmp_descs(fwd); |
300 | unsigned long *values = fwd_tmp_values(fwd); |
301 | unsigned int i, j = 0; |
302 | int error; |
303 | |
304 | bitmap_clear(map: values, start: 0, nbits: fwd->chip.ngpio); |
305 | for_each_set_bit(i, mask, fwd->chip.ngpio) |
306 | descs[j++] = fwd->descs[i]; |
307 | |
308 | if (fwd->chip.can_sleep) |
309 | error = gpiod_get_array_value_cansleep(array_size: j, desc_array: descs, NULL, value_bitmap: values); |
310 | else |
311 | error = gpiod_get_array_value(array_size: j, desc_array: descs, NULL, value_bitmap: values); |
312 | if (error) |
313 | return error; |
314 | |
315 | j = 0; |
316 | for_each_set_bit(i, mask, fwd->chip.ngpio) |
317 | __assign_bit(nr: i, addr: bits, test_bit(j++, values)); |
318 | |
319 | return 0; |
320 | } |
321 | |
322 | static int gpio_fwd_get_multiple_locked(struct gpio_chip *chip, |
323 | unsigned long *mask, unsigned long *bits) |
324 | { |
325 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
326 | unsigned long flags; |
327 | int error; |
328 | |
329 | if (chip->can_sleep) { |
330 | mutex_lock(&fwd->mlock); |
331 | error = gpio_fwd_get_multiple(fwd, mask, bits); |
332 | mutex_unlock(lock: &fwd->mlock); |
333 | } else { |
334 | spin_lock_irqsave(&fwd->slock, flags); |
335 | error = gpio_fwd_get_multiple(fwd, mask, bits); |
336 | spin_unlock_irqrestore(lock: &fwd->slock, flags); |
337 | } |
338 | |
339 | return error; |
340 | } |
341 | |
342 | static void gpio_fwd_delay(struct gpio_chip *chip, unsigned int offset, int value) |
343 | { |
344 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
345 | const struct gpiochip_fwd_timing *delay_timings; |
346 | bool is_active_low = gpiod_is_active_low(desc: fwd->descs[offset]); |
347 | u32 delay_us; |
348 | |
349 | delay_timings = &fwd->delay_timings[offset]; |
350 | if ((!is_active_low && value) || (is_active_low && !value)) |
351 | delay_us = delay_timings->ramp_up_us; |
352 | else |
353 | delay_us = delay_timings->ramp_down_us; |
354 | if (!delay_us) |
355 | return; |
356 | |
357 | if (chip->can_sleep) |
358 | fsleep(usecs: delay_us); |
359 | else |
360 | udelay(delay_us); |
361 | } |
362 | |
363 | static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value) |
364 | { |
365 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
366 | |
367 | if (chip->can_sleep) |
368 | gpiod_set_value_cansleep(desc: fwd->descs[offset], value); |
369 | else |
370 | gpiod_set_value(desc: fwd->descs[offset], value); |
371 | |
372 | if (fwd->delay_timings) |
373 | gpio_fwd_delay(chip, offset, value); |
374 | } |
375 | |
376 | static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, |
377 | unsigned long *bits) |
378 | { |
379 | struct gpio_desc **descs = fwd_tmp_descs(fwd); |
380 | unsigned long *values = fwd_tmp_values(fwd); |
381 | unsigned int i, j = 0; |
382 | |
383 | for_each_set_bit(i, mask, fwd->chip.ngpio) { |
384 | __assign_bit(nr: j, addr: values, test_bit(i, bits)); |
385 | descs[j++] = fwd->descs[i]; |
386 | } |
387 | |
388 | if (fwd->chip.can_sleep) |
389 | gpiod_set_array_value_cansleep(array_size: j, desc_array: descs, NULL, value_bitmap: values); |
390 | else |
391 | gpiod_set_array_value(array_size: j, desc_array: descs, NULL, value_bitmap: values); |
392 | } |
393 | |
394 | static void gpio_fwd_set_multiple_locked(struct gpio_chip *chip, |
395 | unsigned long *mask, unsigned long *bits) |
396 | { |
397 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
398 | unsigned long flags; |
399 | |
400 | if (chip->can_sleep) { |
401 | mutex_lock(&fwd->mlock); |
402 | gpio_fwd_set_multiple(fwd, mask, bits); |
403 | mutex_unlock(lock: &fwd->mlock); |
404 | } else { |
405 | spin_lock_irqsave(&fwd->slock, flags); |
406 | gpio_fwd_set_multiple(fwd, mask, bits); |
407 | spin_unlock_irqrestore(lock: &fwd->slock, flags); |
408 | } |
409 | } |
410 | |
411 | static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset, |
412 | unsigned long config) |
413 | { |
414 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
415 | |
416 | return gpiod_set_config(desc: fwd->descs[offset], config); |
417 | } |
418 | |
419 | static int gpio_fwd_to_irq(struct gpio_chip *chip, unsigned int offset) |
420 | { |
421 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
422 | |
423 | return gpiod_to_irq(desc: fwd->descs[offset]); |
424 | } |
425 | |
426 | /* |
427 | * The GPIO delay provides a way to configure platform specific delays |
428 | * for the GPIO ramp-up or ramp-down delays. This can serve the following |
429 | * purposes: |
430 | * - Open-drain output using an RC filter |
431 | */ |
432 | #define FWD_FEATURE_DELAY BIT(0) |
433 | |
434 | #ifdef CONFIG_OF_GPIO |
435 | static int gpiochip_fwd_delay_of_xlate(struct gpio_chip *chip, |
436 | const struct of_phandle_args *gpiospec, |
437 | u32 *flags) |
438 | { |
439 | struct gpiochip_fwd *fwd = gpiochip_get_data(gc: chip); |
440 | struct gpiochip_fwd_timing *timings; |
441 | u32 line; |
442 | |
443 | if (gpiospec->args_count != chip->of_gpio_n_cells) |
444 | return -EINVAL; |
445 | |
446 | line = gpiospec->args[0]; |
447 | if (line >= chip->ngpio) |
448 | return -EINVAL; |
449 | |
450 | timings = &fwd->delay_timings[line]; |
451 | timings->ramp_up_us = gpiospec->args[1]; |
452 | timings->ramp_down_us = gpiospec->args[2]; |
453 | |
454 | return line; |
455 | } |
456 | |
457 | static int gpiochip_fwd_setup_delay_line(struct device *dev, struct gpio_chip *chip, |
458 | struct gpiochip_fwd *fwd) |
459 | { |
460 | fwd->delay_timings = devm_kcalloc(dev, n: chip->ngpio, |
461 | size: sizeof(*fwd->delay_timings), |
462 | GFP_KERNEL); |
463 | if (!fwd->delay_timings) |
464 | return -ENOMEM; |
465 | |
466 | chip->of_xlate = gpiochip_fwd_delay_of_xlate; |
467 | chip->of_gpio_n_cells = 3; |
468 | |
469 | return 0; |
470 | } |
471 | #else |
472 | static int gpiochip_fwd_setup_delay_line(struct device *dev, struct gpio_chip *chip, |
473 | struct gpiochip_fwd *fwd) |
474 | { |
475 | return 0; |
476 | } |
477 | #endif /* !CONFIG_OF_GPIO */ |
478 | |
479 | /** |
480 | * gpiochip_fwd_create() - Create a new GPIO forwarder |
481 | * @dev: Parent device pointer |
482 | * @ngpios: Number of GPIOs in the forwarder. |
483 | * @descs: Array containing the GPIO descriptors to forward to. |
484 | * This array must contain @ngpios entries, and must not be deallocated |
485 | * before the forwarder has been destroyed again. |
486 | * @features: Bitwise ORed features as defined with FWD_FEATURE_*. |
487 | * |
488 | * This function creates a new gpiochip, which forwards all GPIO operations to |
489 | * the passed GPIO descriptors. |
490 | * |
491 | * Return: An opaque object pointer, or an ERR_PTR()-encoded negative error |
492 | * code on failure. |
493 | */ |
494 | static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev, |
495 | unsigned int ngpios, |
496 | struct gpio_desc *descs[], |
497 | unsigned long features) |
498 | { |
499 | const char *label = dev_name(dev); |
500 | struct gpiochip_fwd *fwd; |
501 | struct gpio_chip *chip; |
502 | unsigned int i; |
503 | int error; |
504 | |
505 | fwd = devm_kzalloc(dev, struct_size(fwd, tmp, fwd_tmp_size(ngpios)), |
506 | GFP_KERNEL); |
507 | if (!fwd) |
508 | return ERR_PTR(error: -ENOMEM); |
509 | |
510 | chip = &fwd->chip; |
511 | |
512 | /* |
513 | * If any of the GPIO lines are sleeping, then the entire forwarder |
514 | * will be sleeping. |
515 | * If any of the chips support .set_config(), then the forwarder will |
516 | * support setting configs. |
517 | */ |
518 | for (i = 0; i < ngpios; i++) { |
519 | struct gpio_chip *parent = gpiod_to_chip(desc: descs[i]); |
520 | |
521 | dev_dbg(dev, "%u => gpio %d irq %d\n" , i, |
522 | desc_to_gpio(descs[i]), gpiod_to_irq(descs[i])); |
523 | |
524 | if (gpiod_cansleep(desc: descs[i])) |
525 | chip->can_sleep = true; |
526 | if (parent && parent->set_config) |
527 | chip->set_config = gpio_fwd_set_config; |
528 | } |
529 | |
530 | chip->label = label; |
531 | chip->parent = dev; |
532 | chip->owner = THIS_MODULE; |
533 | chip->get_direction = gpio_fwd_get_direction; |
534 | chip->direction_input = gpio_fwd_direction_input; |
535 | chip->direction_output = gpio_fwd_direction_output; |
536 | chip->get = gpio_fwd_get; |
537 | chip->get_multiple = gpio_fwd_get_multiple_locked; |
538 | chip->set = gpio_fwd_set; |
539 | chip->set_multiple = gpio_fwd_set_multiple_locked; |
540 | chip->to_irq = gpio_fwd_to_irq; |
541 | chip->base = -1; |
542 | chip->ngpio = ngpios; |
543 | fwd->descs = descs; |
544 | |
545 | if (chip->can_sleep) |
546 | mutex_init(&fwd->mlock); |
547 | else |
548 | spin_lock_init(&fwd->slock); |
549 | |
550 | if (features & FWD_FEATURE_DELAY) { |
551 | error = gpiochip_fwd_setup_delay_line(dev, chip, fwd); |
552 | if (error) |
553 | return ERR_PTR(error); |
554 | } |
555 | |
556 | error = devm_gpiochip_add_data(dev, chip, fwd); |
557 | if (error) |
558 | return ERR_PTR(error); |
559 | |
560 | return fwd; |
561 | } |
562 | |
563 | |
564 | /* |
565 | * GPIO Aggregator platform device |
566 | */ |
567 | |
568 | static int gpio_aggregator_probe(struct platform_device *pdev) |
569 | { |
570 | struct device *dev = &pdev->dev; |
571 | struct gpio_desc **descs; |
572 | struct gpiochip_fwd *fwd; |
573 | unsigned long features; |
574 | int i, n; |
575 | |
576 | n = gpiod_count(dev, NULL); |
577 | if (n < 0) |
578 | return n; |
579 | |
580 | descs = devm_kmalloc_array(dev, n, size: sizeof(*descs), GFP_KERNEL); |
581 | if (!descs) |
582 | return -ENOMEM; |
583 | |
584 | for (i = 0; i < n; i++) { |
585 | descs[i] = devm_gpiod_get_index(dev, NULL, idx: i, flags: GPIOD_ASIS); |
586 | if (IS_ERR(ptr: descs[i])) |
587 | return PTR_ERR(ptr: descs[i]); |
588 | } |
589 | |
590 | features = (uintptr_t)device_get_match_data(dev); |
591 | fwd = gpiochip_fwd_create(dev, ngpios: n, descs, features); |
592 | if (IS_ERR(ptr: fwd)) |
593 | return PTR_ERR(ptr: fwd); |
594 | |
595 | platform_set_drvdata(pdev, data: fwd); |
596 | return 0; |
597 | } |
598 | |
599 | static const struct of_device_id gpio_aggregator_dt_ids[] = { |
600 | { |
601 | .compatible = "gpio-delay" , |
602 | .data = (void *)FWD_FEATURE_DELAY, |
603 | }, |
604 | /* |
605 | * Add GPIO-operated devices controlled from userspace below, |
606 | * or use "driver_override" in sysfs. |
607 | */ |
608 | {} |
609 | }; |
610 | MODULE_DEVICE_TABLE(of, gpio_aggregator_dt_ids); |
611 | |
612 | static struct platform_driver gpio_aggregator_driver = { |
613 | .probe = gpio_aggregator_probe, |
614 | .driver = { |
615 | .name = DRV_NAME, |
616 | .groups = gpio_aggregator_groups, |
617 | .of_match_table = gpio_aggregator_dt_ids, |
618 | }, |
619 | }; |
620 | |
621 | static int __init gpio_aggregator_init(void) |
622 | { |
623 | return platform_driver_register(&gpio_aggregator_driver); |
624 | } |
625 | module_init(gpio_aggregator_init); |
626 | |
627 | static void __exit gpio_aggregator_exit(void) |
628 | { |
629 | gpio_aggregator_remove_all(); |
630 | platform_driver_unregister(&gpio_aggregator_driver); |
631 | } |
632 | module_exit(gpio_aggregator_exit); |
633 | |
634 | MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>" ); |
635 | MODULE_DESCRIPTION("GPIO Aggregator" ); |
636 | MODULE_LICENSE("GPL v2" ); |
637 | |