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828546e2 GU |
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> | |
b466622c | 13 | #include <linux/delay.h> |
828546e2 GU |
14 | #include <linux/idr.h> |
15 | #include <linux/kernel.h> | |
b89a9e98 | 16 | #include <linux/mod_devicetable.h> |
828546e2 GU |
17 | #include <linux/module.h> |
18 | #include <linux/mutex.h> | |
19 | #include <linux/overflow.h> | |
20 | #include <linux/platform_device.h> | |
81674bea | 21 | #include <linux/property.h> |
39ebbd52 | 22 | #include <linux/slab.h> |
828546e2 GU |
23 | #include <linux/spinlock.h> |
24 | #include <linux/string.h> | |
25 | ||
39ebbd52 AS |
26 | #include <linux/gpio/consumer.h> |
27 | #include <linux/gpio/driver.h> | |
28 | #include <linux/gpio/machine.h> | |
29 | ||
95b39792 | 30 | #define AGGREGATOR_MAX_GPIOS 512 |
828546e2 GU |
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 | ||
828546e2 GU |
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(aggr->lookups, struct_size(lookups, table, *n + 2), | |
51 | GFP_KERNEL); | |
52 | if (!lookups) | |
53 | return -ENOMEM; | |
54 | ||
b2498cb8 | 55 | lookups->table[*n] = GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0); |
828546e2 GU |
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 | { | |
ac505b6f | 66 | char *args = skip_spaces(aggr->args); |
deb631c4 | 67 | char *name, *offsets, *p; |
ec75039d GU |
68 | unsigned long *bitmap; |
69 | unsigned int i, n = 0; | |
ec75039d GU |
70 | int error = 0; |
71 | ||
95b39792 | 72 | bitmap = bitmap_alloc(AGGREGATOR_MAX_GPIOS, GFP_KERNEL); |
ec75039d GU |
73 | if (!bitmap) |
74 | return -ENOMEM; | |
828546e2 | 75 | |
ac505b6f AS |
76 | args = next_arg(args, &name, &p); |
77 | while (*args) { | |
78 | args = next_arg(args, &offsets, &p); | |
828546e2 | 79 | |
deb631c4 AS |
80 | p = get_options(offsets, 0, &error); |
81 | if (error == 0 || *p) { | |
828546e2 GU |
82 | /* Named GPIO line */ |
83 | error = aggr_add_gpio(aggr, name, U16_MAX, &n); | |
84 | if (error) | |
ec75039d | 85 | goto free_bitmap; |
828546e2 GU |
86 | |
87 | name = offsets; | |
88 | continue; | |
89 | } | |
90 | ||
91 | /* GPIO chip + offset(s) */ | |
95b39792 | 92 | error = bitmap_parselist(offsets, bitmap, AGGREGATOR_MAX_GPIOS); |
ec75039d GU |
93 | if (error) { |
94 | pr_err("Cannot parse %s: %d\n", offsets, error); | |
95 | goto free_bitmap; | |
96 | } | |
97 | ||
95b39792 | 98 | for_each_set_bit(i, bitmap, AGGREGATOR_MAX_GPIOS) { |
ec75039d GU |
99 | error = aggr_add_gpio(aggr, name, i, &n); |
100 | if (error) | |
101 | goto free_bitmap; | |
828546e2 GU |
102 | } |
103 | ||
ac505b6f | 104 | args = next_arg(args, &name, &p); |
828546e2 GU |
105 | } |
106 | ||
107 | if (!n) { | |
108 | pr_err("No GPIOs specified\n"); | |
ec75039d | 109 | error = -EINVAL; |
828546e2 GU |
110 | } |
111 | ||
ec75039d GU |
112 | free_bitmap: |
113 | bitmap_free(bitmap); | |
114 | return error; | |
828546e2 GU |
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(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, aggr, 0, 0, GFP_KERNEL); | |
140 | mutex_unlock(&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, "%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(aggr->lookups); | |
158 | ||
159 | pdev = platform_device_register_simple(DRV_NAME, id, NULL, 0); | |
160 | if (IS_ERR(pdev)) { | |
161 | res = PTR_ERR(pdev); | |
162 | goto remove_table; | |
163 | } | |
164 | ||
165 | aggr->pdev = pdev; | |
166 | return count; | |
167 | ||
168 | remove_table: | |
169 | gpiod_remove_lookup_table(aggr->lookups); | |
170 | free_dev_id: | |
171 | kfree(aggr->lookups->dev_id); | |
172 | remove_idr: | |
173 | mutex_lock(&gpio_aggregator_lock); | |
174 | idr_remove(&gpio_aggregator_idr, id); | |
175 | mutex_unlock(&gpio_aggregator_lock); | |
176 | free_table: | |
177 | kfree(aggr->lookups); | |
178 | free_ga: | |
179 | kfree(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(aggr->lookups); | |
189 | kfree(aggr->lookups->dev_id); | |
190 | kfree(aggr->lookups); | |
191 | kfree(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(buf, DRV_NAME ".")) | |
202 | return -EINVAL; | |
203 | ||
204 | error = kstrtouint(buf + strlen(DRV_NAME "."), 10, &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(&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, | |
6e004a98 | 222 | NULL |
828546e2 GU |
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(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, gpio_aggregator_idr_remove, NULL); | |
236 | idr_destroy(&gpio_aggregator_idr); | |
237 | mutex_unlock(&gpio_aggregator_lock); | |
238 | } | |
239 | ||
240 | ||
241 | /* | |
242 | * GPIO Forwarder | |
243 | */ | |
244 | ||
b466622c AS |
245 | struct gpiochip_fwd_timing { |
246 | u32 ramp_up_us; | |
247 | u32 ramp_down_us; | |
248 | }; | |
249 | ||
828546e2 GU |
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 | }; | |
b466622c | 257 | struct gpiochip_fwd_timing *delay_timings; |
828546e2 GU |
258 | unsigned long tmp[]; /* values and descs for multiple ops */ |
259 | }; | |
260 | ||
aa4858eb GU |
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 | ||
828546e2 GU |
266 | static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset) |
267 | { | |
268 | struct gpiochip_fwd *fwd = gpiochip_get_data(chip); | |
269 | ||
270 | return gpiod_get_direction(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(chip); | |
276 | ||
277 | return gpiod_direction_input(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(chip); | |
284 | ||
285 | return gpiod_direction_output(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(chip); | |
291 | ||
2cba0545 GU |
292 | return chip->can_sleep ? gpiod_get_value_cansleep(fwd->descs[offset]) |
293 | : gpiod_get_value(fwd->descs[offset]); | |
828546e2 GU |
294 | } |
295 | ||
01e8d85b | 296 | static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, |
828546e2 GU |
297 | unsigned long *bits) |
298 | { | |
aa4858eb GU |
299 | struct gpio_desc **descs = fwd_tmp_descs(fwd); |
300 | unsigned long *values = fwd_tmp_values(fwd); | |
828546e2 GU |
301 | unsigned int i, j = 0; |
302 | int error; | |
303 | ||
828546e2 GU |
304 | bitmap_clear(values, 0, fwd->chip.ngpio); |
305 | for_each_set_bit(i, mask, fwd->chip.ngpio) | |
306 | descs[j++] = fwd->descs[i]; | |
307 | ||
2cba0545 GU |
308 | if (fwd->chip.can_sleep) |
309 | error = gpiod_get_array_value_cansleep(j, descs, NULL, values); | |
310 | else | |
311 | error = gpiod_get_array_value(j, descs, NULL, values); | |
01e8d85b AS |
312 | if (error) |
313 | return error; | |
828546e2 | 314 | |
01e8d85b AS |
315 | j = 0; |
316 | for_each_set_bit(i, mask, fwd->chip.ngpio) | |
317 | __assign_bit(i, 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(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); | |
828546e2 | 332 | mutex_unlock(&fwd->mlock); |
01e8d85b AS |
333 | } else { |
334 | spin_lock_irqsave(&fwd->slock, flags); | |
335 | error = gpio_fwd_get_multiple(fwd, mask, bits); | |
828546e2 | 336 | spin_unlock_irqrestore(&fwd->slock, flags); |
01e8d85b | 337 | } |
828546e2 GU |
338 | |
339 | return error; | |
340 | } | |
341 | ||
b466622c AS |
342 | static void gpio_fwd_delay(struct gpio_chip *chip, unsigned int offset, int value) |
343 | { | |
344 | struct gpiochip_fwd *fwd = gpiochip_get_data(chip); | |
345 | const struct gpiochip_fwd_timing *delay_timings; | |
346 | bool is_active_low = gpiod_is_active_low(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(delay_us); | |
359 | else | |
360 | udelay(delay_us); | |
361 | } | |
362 | ||
828546e2 GU |
363 | static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value) |
364 | { | |
365 | struct gpiochip_fwd *fwd = gpiochip_get_data(chip); | |
366 | ||
2cba0545 GU |
367 | if (chip->can_sleep) |
368 | gpiod_set_value_cansleep(fwd->descs[offset], value); | |
369 | else | |
370 | gpiod_set_value(fwd->descs[offset], value); | |
b466622c AS |
371 | |
372 | if (fwd->delay_timings) | |
373 | gpio_fwd_delay(chip, offset, value); | |
828546e2 GU |
374 | } |
375 | ||
01e8d85b | 376 | static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, |
828546e2 GU |
377 | unsigned long *bits) |
378 | { | |
aa4858eb GU |
379 | struct gpio_desc **descs = fwd_tmp_descs(fwd); |
380 | unsigned long *values = fwd_tmp_values(fwd); | |
828546e2 GU |
381 | unsigned int i, j = 0; |
382 | ||
828546e2 GU |
383 | for_each_set_bit(i, mask, fwd->chip.ngpio) { |
384 | __assign_bit(j, values, test_bit(i, bits)); | |
385 | descs[j++] = fwd->descs[i]; | |
386 | } | |
387 | ||
2cba0545 GU |
388 | if (fwd->chip.can_sleep) |
389 | gpiod_set_array_value_cansleep(j, descs, NULL, values); | |
390 | else | |
391 | gpiod_set_array_value(j, descs, NULL, values); | |
01e8d85b | 392 | } |
828546e2 | 393 | |
01e8d85b AS |
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(chip); | |
398 | unsigned long flags; | |
399 | ||
400 | if (chip->can_sleep) { | |
401 | mutex_lock(&fwd->mlock); | |
402 | gpio_fwd_set_multiple(fwd, mask, bits); | |
828546e2 | 403 | mutex_unlock(&fwd->mlock); |
01e8d85b AS |
404 | } else { |
405 | spin_lock_irqsave(&fwd->slock, flags); | |
406 | gpio_fwd_set_multiple(fwd, mask, bits); | |
828546e2 | 407 | spin_unlock_irqrestore(&fwd->slock, flags); |
01e8d85b | 408 | } |
828546e2 GU |
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(chip); | |
415 | ||
416 | return gpiod_set_config(fwd->descs[offset], config); | |
417 | } | |
418 | ||
a00128df GU |
419 | static int gpio_fwd_to_irq(struct gpio_chip *chip, unsigned int offset) |
420 | { | |
421 | struct gpiochip_fwd *fwd = gpiochip_get_data(chip); | |
422 | ||
423 | return gpiod_to_irq(fwd->descs[offset]); | |
424 | } | |
425 | ||
81674bea AS |
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(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, chip->ngpio, | |
461 | 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 | ||
828546e2 GU |
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. | |
81674bea | 486 | * @features: Bitwise ORed features as defined with FWD_FEATURE_*. |
828546e2 GU |
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, | |
81674bea AS |
496 | struct gpio_desc *descs[], |
497 | unsigned long features) | |
828546e2 GU |
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 | ||
aa4858eb GU |
505 | fwd = devm_kzalloc(dev, struct_size(fwd, tmp, fwd_tmp_size(ngpios)), |
506 | GFP_KERNEL); | |
828546e2 GU |
507 | if (!fwd) |
508 | return ERR_PTR(-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(descs[i]); | |
520 | ||
a00128df GU |
521 | dev_dbg(dev, "%u => gpio %d irq %d\n", i, |
522 | desc_to_gpio(descs[i]), gpiod_to_irq(descs[i])); | |
828546e2 GU |
523 | |
524 | if (gpiod_cansleep(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; | |
01e8d85b | 537 | chip->get_multiple = gpio_fwd_get_multiple_locked; |
828546e2 | 538 | chip->set = gpio_fwd_set; |
01e8d85b | 539 | chip->set_multiple = gpio_fwd_set_multiple_locked; |
a00128df | 540 | chip->to_irq = gpio_fwd_to_irq; |
828546e2 GU |
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 | ||
81674bea AS |
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 | ||
828546e2 GU |
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; | |
81674bea | 573 | unsigned long features; |
828546e2 GU |
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, 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, i, GPIOD_ASIS); | |
586 | if (IS_ERR(descs[i])) | |
587 | return PTR_ERR(descs[i]); | |
588 | } | |
589 | ||
81674bea AS |
590 | features = (uintptr_t)device_get_match_data(dev); |
591 | fwd = gpiochip_fwd_create(dev, n, descs, features); | |
828546e2 GU |
592 | if (IS_ERR(fwd)) |
593 | return PTR_ERR(fwd); | |
594 | ||
595 | platform_set_drvdata(pdev, fwd); | |
596 | return 0; | |
597 | } | |
598 | ||
828546e2 | 599 | static const struct of_device_id gpio_aggregator_dt_ids[] = { |
81674bea AS |
600 | { |
601 | .compatible = "gpio-delay", | |
602 | .data = (void *)FWD_FEATURE_DELAY, | |
603 | }, | |
828546e2 GU |
604 | /* |
605 | * Add GPIO-operated devices controlled from userspace below, | |
b89a9e98 | 606 | * or use "driver_override" in sysfs. |
828546e2 | 607 | */ |
6e004a98 | 608 | {} |
828546e2 GU |
609 | }; |
610 | MODULE_DEVICE_TABLE(of, gpio_aggregator_dt_ids); | |
828546e2 GU |
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, | |
b89a9e98 | 617 | .of_match_table = gpio_aggregator_dt_ids, |
828546e2 GU |
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"); |