Commit | Line | Data |
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e29482e8 MN |
1 | /* |
2 | * ACPI helpers for GPIO API | |
3 | * | |
4 | * Copyright (C) 2012, Intel Corporation | |
5 | * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> | |
6 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/errno.h> | |
354567e6 | 14 | #include <linux/gpio.h> |
936e15dd | 15 | #include <linux/gpio/consumer.h> |
5ccff852 | 16 | #include <linux/gpio/driver.h> |
031ba28a | 17 | #include <linux/gpio/machine.h> |
e29482e8 | 18 | #include <linux/export.h> |
e29482e8 | 19 | #include <linux/acpi.h> |
0d1c28a4 | 20 | #include <linux/interrupt.h> |
473ed7be | 21 | #include <linux/mutex.h> |
354567e6 | 22 | #include <linux/pinctrl/pinctrl.h> |
e29482e8 | 23 | |
5ccff852 MW |
24 | #include "gpiolib.h" |
25 | ||
4b01a14b | 26 | struct acpi_gpio_event { |
7fc7acb9 | 27 | struct list_head node; |
4b01a14b | 28 | acpi_handle handle; |
7fc7acb9 RW |
29 | unsigned int pin; |
30 | unsigned int irq; | |
e46cf32c | 31 | struct gpio_desc *desc; |
7fc7acb9 RW |
32 | }; |
33 | ||
473ed7be MW |
34 | struct acpi_gpio_connection { |
35 | struct list_head node; | |
e46cf32c | 36 | unsigned int pin; |
473ed7be MW |
37 | struct gpio_desc *desc; |
38 | }; | |
39 | ||
aa92b6f6 | 40 | struct acpi_gpio_chip { |
473ed7be MW |
41 | /* |
42 | * ACPICA requires that the first field of the context parameter | |
43 | * passed to acpi_install_address_space_handler() is large enough | |
44 | * to hold struct acpi_connection_info. | |
45 | */ | |
46 | struct acpi_connection_info conn_info; | |
47 | struct list_head conns; | |
48 | struct mutex conn_lock; | |
aa92b6f6 | 49 | struct gpio_chip *chip; |
4b01a14b | 50 | struct list_head events; |
aa92b6f6 MW |
51 | }; |
52 | ||
e29482e8 MN |
53 | static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) |
54 | { | |
58383c78 | 55 | if (!gc->parent) |
e29482e8 MN |
56 | return false; |
57 | ||
58383c78 | 58 | return ACPI_HANDLE(gc->parent) == data; |
e29482e8 MN |
59 | } |
60 | ||
354567e6 MW |
61 | #ifdef CONFIG_PINCTRL |
62 | /** | |
63 | * acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO | |
db05c7ef | 64 | * @gdev: GPIO device |
354567e6 MW |
65 | * @pin: ACPI GPIO pin number from GpioIo/GpioInt resource |
66 | * | |
67 | * Function takes ACPI GpioIo/GpioInt pin number as a parameter and | |
68 | * translates it to a corresponding offset suitable to be passed to a | |
69 | * GPIO controller driver. | |
70 | * | |
71 | * Typically the returned offset is same as @pin, but if the GPIO | |
e1c05067 | 72 | * controller uses pin controller and the mapping is not contiguous the |
354567e6 MW |
73 | * offset might be different. |
74 | */ | |
20ec3e39 | 75 | static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev, int pin) |
354567e6 MW |
76 | { |
77 | struct gpio_pin_range *pin_range; | |
78 | ||
79 | /* If there are no ranges in this chip, use 1:1 mapping */ | |
20ec3e39 | 80 | if (list_empty(&gdev->pin_ranges)) |
354567e6 MW |
81 | return pin; |
82 | ||
20ec3e39 | 83 | list_for_each_entry(pin_range, &gdev->pin_ranges, node) { |
354567e6 MW |
84 | const struct pinctrl_gpio_range *range = &pin_range->range; |
85 | int i; | |
86 | ||
87 | if (range->pins) { | |
88 | for (i = 0; i < range->npins; i++) { | |
89 | if (range->pins[i] == pin) | |
20ec3e39 | 90 | return range->base + i - gdev->base; |
354567e6 MW |
91 | } |
92 | } else { | |
93 | if (pin >= range->pin_base && | |
94 | pin < range->pin_base + range->npins) { | |
95 | unsigned gpio_base; | |
96 | ||
20ec3e39 | 97 | gpio_base = range->base - gdev->base; |
354567e6 MW |
98 | return gpio_base + pin - range->pin_base; |
99 | } | |
100 | } | |
101 | } | |
102 | ||
103 | return -EINVAL; | |
104 | } | |
105 | #else | |
20ec3e39 | 106 | static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev, |
354567e6 MW |
107 | int pin) |
108 | { | |
109 | return pin; | |
110 | } | |
111 | #endif | |
112 | ||
e29482e8 | 113 | /** |
936e15dd | 114 | * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API |
e29482e8 MN |
115 | * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") |
116 | * @pin: ACPI GPIO pin number (0-based, controller-relative) | |
117 | * | |
f35bbf61 MW |
118 | * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR |
119 | * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO | |
120 | * controller does not have gpiochip registered at the moment. This is to | |
121 | * support probe deferral. | |
e29482e8 | 122 | */ |
936e15dd | 123 | static struct gpio_desc *acpi_get_gpiod(char *path, int pin) |
e29482e8 MN |
124 | { |
125 | struct gpio_chip *chip; | |
126 | acpi_handle handle; | |
127 | acpi_status status; | |
354567e6 | 128 | int offset; |
e29482e8 MN |
129 | |
130 | status = acpi_get_handle(NULL, path, &handle); | |
131 | if (ACPI_FAILURE(status)) | |
936e15dd | 132 | return ERR_PTR(-ENODEV); |
e29482e8 MN |
133 | |
134 | chip = gpiochip_find(handle, acpi_gpiochip_find); | |
135 | if (!chip) | |
f35bbf61 | 136 | return ERR_PTR(-EPROBE_DEFER); |
e29482e8 | 137 | |
20ec3e39 | 138 | offset = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin); |
354567e6 MW |
139 | if (offset < 0) |
140 | return ERR_PTR(offset); | |
e29482e8 | 141 | |
354567e6 | 142 | return gpiochip_get_desc(chip, offset); |
e29482e8 | 143 | } |
0d1c28a4 | 144 | |
0d1c28a4 MN |
145 | static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) |
146 | { | |
6072b9dc | 147 | struct acpi_gpio_event *event = data; |
0d1c28a4 | 148 | |
6072b9dc | 149 | acpi_evaluate_object(event->handle, NULL, NULL, NULL); |
0d1c28a4 MN |
150 | |
151 | return IRQ_HANDLED; | |
152 | } | |
153 | ||
7fc7acb9 RW |
154 | static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) |
155 | { | |
4b01a14b | 156 | struct acpi_gpio_event *event = data; |
7fc7acb9 | 157 | |
4b01a14b | 158 | acpi_execute_simple_method(event->handle, NULL, event->pin); |
7fc7acb9 RW |
159 | |
160 | return IRQ_HANDLED; | |
161 | } | |
162 | ||
aa92b6f6 | 163 | static void acpi_gpio_chip_dh(acpi_handle handle, void *data) |
7fc7acb9 RW |
164 | { |
165 | /* The address of this function is used as a key. */ | |
166 | } | |
167 | ||
25e3ef89 AS |
168 | bool acpi_gpio_get_irq_resource(struct acpi_resource *ares, |
169 | struct acpi_resource_gpio **agpio) | |
170 | { | |
171 | struct acpi_resource_gpio *gpio; | |
172 | ||
173 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
174 | return false; | |
175 | ||
176 | gpio = &ares->data.gpio; | |
177 | if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) | |
178 | return false; | |
179 | ||
180 | *agpio = gpio; | |
181 | return true; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource); | |
184 | ||
6072b9dc MW |
185 | static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares, |
186 | void *context) | |
0d1c28a4 | 187 | { |
6072b9dc | 188 | struct acpi_gpio_chip *acpi_gpio = context; |
aa92b6f6 | 189 | struct gpio_chip *chip = acpi_gpio->chip; |
6072b9dc | 190 | struct acpi_resource_gpio *agpio; |
7fc7acb9 | 191 | acpi_handle handle, evt_handle; |
6072b9dc MW |
192 | struct acpi_gpio_event *event; |
193 | irq_handler_t handler = NULL; | |
194 | struct gpio_desc *desc; | |
195 | unsigned long irqflags; | |
196 | int ret, pin, irq; | |
0d1c28a4 | 197 | |
25e3ef89 | 198 | if (!acpi_gpio_get_irq_resource(ares, &agpio)) |
6072b9dc | 199 | return AE_OK; |
0d1c28a4 | 200 | |
58383c78 | 201 | handle = ACPI_HANDLE(chip->parent); |
6072b9dc MW |
202 | pin = agpio->pin_table[0]; |
203 | ||
204 | if (pin <= 255) { | |
205 | char ev_name[5]; | |
e40a3ae1 | 206 | sprintf(ev_name, "_%c%02hhX", |
6072b9dc MW |
207 | agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', |
208 | pin); | |
209 | if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) | |
210 | handler = acpi_gpio_irq_handler; | |
211 | } | |
212 | if (!handler) { | |
213 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) | |
214 | handler = acpi_gpio_irq_handler_evt; | |
215 | } | |
216 | if (!handler) | |
c06632ea | 217 | return AE_OK; |
0d1c28a4 | 218 | |
20ec3e39 | 219 | pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin); |
4de60970 | 220 | if (pin < 0) |
221 | return AE_BAD_PARAMETER; | |
222 | ||
abdc08a3 | 223 | desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event"); |
6072b9dc | 224 | if (IS_ERR(desc)) { |
58383c78 | 225 | dev_err(chip->parent, "Failed to request GPIO\n"); |
6072b9dc MW |
226 | return AE_ERROR; |
227 | } | |
0d1c28a4 | 228 | |
6072b9dc | 229 | gpiod_direction_input(desc); |
0d1c28a4 | 230 | |
e3a2e878 | 231 | ret = gpiochip_lock_as_irq(chip, pin); |
6072b9dc | 232 | if (ret) { |
58383c78 | 233 | dev_err(chip->parent, "Failed to lock GPIO as interrupt\n"); |
6072b9dc MW |
234 | goto fail_free_desc; |
235 | } | |
0d1c28a4 | 236 | |
6072b9dc MW |
237 | irq = gpiod_to_irq(desc); |
238 | if (irq < 0) { | |
58383c78 | 239 | dev_err(chip->parent, "Failed to translate GPIO to IRQ\n"); |
6072b9dc MW |
240 | goto fail_unlock_irq; |
241 | } | |
7fc7acb9 | 242 | |
6072b9dc MW |
243 | irqflags = IRQF_ONESHOT; |
244 | if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { | |
245 | if (agpio->polarity == ACPI_ACTIVE_HIGH) | |
246 | irqflags |= IRQF_TRIGGER_HIGH; | |
247 | else | |
248 | irqflags |= IRQF_TRIGGER_LOW; | |
249 | } else { | |
250 | switch (agpio->polarity) { | |
251 | case ACPI_ACTIVE_HIGH: | |
252 | irqflags |= IRQF_TRIGGER_RISING; | |
253 | break; | |
254 | case ACPI_ACTIVE_LOW: | |
255 | irqflags |= IRQF_TRIGGER_FALLING; | |
256 | break; | |
257 | default: | |
258 | irqflags |= IRQF_TRIGGER_RISING | | |
259 | IRQF_TRIGGER_FALLING; | |
260 | break; | |
7fc7acb9 | 261 | } |
6072b9dc | 262 | } |
aa92b6f6 | 263 | |
6072b9dc MW |
264 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
265 | if (!event) | |
266 | goto fail_unlock_irq; | |
7fc7acb9 | 267 | |
6072b9dc MW |
268 | event->handle = evt_handle; |
269 | event->irq = irq; | |
270 | event->pin = pin; | |
e46cf32c | 271 | event->desc = desc; |
7fc7acb9 | 272 | |
6072b9dc MW |
273 | ret = request_threaded_irq(event->irq, NULL, handler, irqflags, |
274 | "ACPI:Event", event); | |
275 | if (ret) { | |
58383c78 LW |
276 | dev_err(chip->parent, |
277 | "Failed to setup interrupt handler for %d\n", | |
6072b9dc MW |
278 | event->irq); |
279 | goto fail_free_event; | |
0d1c28a4 | 280 | } |
6072b9dc | 281 | |
8a146fbe HG |
282 | if (agpio->wake_capable == ACPI_WAKE_CAPABLE) |
283 | enable_irq_wake(irq); | |
284 | ||
6072b9dc MW |
285 | list_add_tail(&event->node, &acpi_gpio->events); |
286 | return AE_OK; | |
287 | ||
288 | fail_free_event: | |
289 | kfree(event); | |
290 | fail_unlock_irq: | |
e3a2e878 | 291 | gpiochip_unlock_as_irq(chip, pin); |
6072b9dc MW |
292 | fail_free_desc: |
293 | gpiochip_free_own_desc(desc); | |
294 | ||
295 | return AE_ERROR; | |
0d1c28a4 | 296 | } |
7fc7acb9 | 297 | |
70b53411 | 298 | /** |
6072b9dc | 299 | * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events |
afa82fab | 300 | * @chip: GPIO chip |
70b53411 | 301 | * |
6072b9dc MW |
302 | * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are |
303 | * handled by ACPI event methods which need to be called from the GPIO | |
304 | * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which | |
305 | * gpio pins have acpi event methods and assigns interrupt handlers that calls | |
306 | * the acpi event methods for those pins. | |
307 | */ | |
afa82fab | 308 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) |
6072b9dc | 309 | { |
afa82fab MW |
310 | struct acpi_gpio_chip *acpi_gpio; |
311 | acpi_handle handle; | |
312 | acpi_status status; | |
313 | ||
58383c78 | 314 | if (!chip->parent || !chip->to_irq) |
afa82fab | 315 | return; |
6072b9dc | 316 | |
58383c78 | 317 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
318 | if (!handle) |
319 | return; | |
320 | ||
321 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
322 | if (ACPI_FAILURE(status)) | |
6072b9dc MW |
323 | return; |
324 | ||
1ecb016e | 325 | acpi_walk_resources(handle, "_AEI", |
6072b9dc MW |
326 | acpi_gpiochip_request_interrupt, acpi_gpio); |
327 | } | |
2b528fff | 328 | EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts); |
6072b9dc MW |
329 | |
330 | /** | |
331 | * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. | |
afa82fab | 332 | * @chip: GPIO chip |
70b53411 | 333 | * |
6072b9dc MW |
334 | * Free interrupts associated with GPIO ACPI event method for the given |
335 | * GPIO chip. | |
70b53411 | 336 | */ |
afa82fab | 337 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) |
70b53411 | 338 | { |
afa82fab | 339 | struct acpi_gpio_chip *acpi_gpio; |
4b01a14b | 340 | struct acpi_gpio_event *event, *ep; |
afa82fab MW |
341 | acpi_handle handle; |
342 | acpi_status status; | |
343 | ||
58383c78 | 344 | if (!chip->parent || !chip->to_irq) |
afa82fab | 345 | return; |
70b53411 | 346 | |
58383c78 | 347 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
348 | if (!handle) |
349 | return; | |
350 | ||
351 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
352 | if (ACPI_FAILURE(status)) | |
70b53411 MW |
353 | return; |
354 | ||
4b01a14b | 355 | list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { |
6072b9dc MW |
356 | struct gpio_desc *desc; |
357 | ||
8a146fbe HG |
358 | if (irqd_is_wakeup_set(irq_get_irq_data(event->irq))) |
359 | disable_irq_wake(event->irq); | |
360 | ||
6072b9dc | 361 | free_irq(event->irq, event); |
e46cf32c | 362 | desc = event->desc; |
6072b9dc MW |
363 | if (WARN_ON(IS_ERR(desc))) |
364 | continue; | |
e3a2e878 | 365 | gpiochip_unlock_as_irq(chip, event->pin); |
6072b9dc | 366 | gpiochip_free_own_desc(desc); |
4b01a14b MW |
367 | list_del(&event->node); |
368 | kfree(event); | |
70b53411 | 369 | } |
70b53411 | 370 | } |
2b528fff | 371 | EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts); |
70b53411 | 372 | |
f028d524 RW |
373 | int acpi_dev_add_driver_gpios(struct acpi_device *adev, |
374 | const struct acpi_gpio_mapping *gpios) | |
375 | { | |
376 | if (adev && gpios) { | |
377 | adev->driver_gpios = gpios; | |
378 | return 0; | |
379 | } | |
380 | return -EINVAL; | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios); | |
383 | ||
85c73d50 AS |
384 | static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res) |
385 | { | |
386 | acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev)); | |
387 | } | |
388 | ||
389 | int devm_acpi_dev_add_driver_gpios(struct device *dev, | |
390 | const struct acpi_gpio_mapping *gpios) | |
391 | { | |
392 | void *res; | |
393 | int ret; | |
394 | ||
395 | res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL); | |
396 | if (!res) | |
397 | return -ENOMEM; | |
398 | ||
399 | ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios); | |
400 | if (ret) { | |
401 | devres_free(res); | |
402 | return ret; | |
403 | } | |
404 | devres_add(dev, res); | |
405 | return 0; | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios); | |
408 | ||
409 | void devm_acpi_dev_remove_driver_gpios(struct device *dev) | |
410 | { | |
411 | WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL)); | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios); | |
414 | ||
f028d524 RW |
415 | static bool acpi_get_driver_gpio_data(struct acpi_device *adev, |
416 | const char *name, int index, | |
417 | struct acpi_reference_args *args) | |
418 | { | |
419 | const struct acpi_gpio_mapping *gm; | |
420 | ||
421 | if (!adev->driver_gpios) | |
422 | return false; | |
423 | ||
424 | for (gm = adev->driver_gpios; gm->name; gm++) | |
425 | if (!strcmp(name, gm->name) && gm->data && index < gm->size) { | |
426 | const struct acpi_gpio_params *par = gm->data + index; | |
427 | ||
428 | args->adev = adev; | |
429 | args->args[0] = par->crs_entry_index; | |
430 | args->args[1] = par->line_index; | |
431 | args->args[2] = par->active_low; | |
432 | args->nargs = 3; | |
433 | return true; | |
434 | } | |
435 | ||
436 | return false; | |
437 | } | |
438 | ||
2eca25af AS |
439 | static enum gpiod_flags |
440 | acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) | |
441 | { | |
442 | bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP; | |
443 | ||
444 | switch (agpio->io_restriction) { | |
445 | case ACPI_IO_RESTRICT_INPUT: | |
446 | return GPIOD_IN; | |
447 | case ACPI_IO_RESTRICT_OUTPUT: | |
448 | /* | |
449 | * ACPI GPIO resources don't contain an initial value for the | |
450 | * GPIO. Therefore we deduce that value from the pull field | |
451 | * instead. If the pin is pulled up we assume default to be | |
452 | * high, otherwise low. | |
453 | */ | |
454 | return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; | |
455 | default: | |
456 | /* | |
457 | * Assume that the BIOS has configured the direction and pull | |
458 | * accordingly. | |
459 | */ | |
460 | return GPIOD_ASIS; | |
461 | } | |
462 | } | |
463 | ||
a31f5c3a AS |
464 | int |
465 | acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) | |
466 | { | |
467 | int ret = 0; | |
468 | ||
469 | /* | |
470 | * Check if the BIOS has IoRestriction with explicitly set direction | |
471 | * and update @flags accordingly. Otherwise use whatever caller asked | |
472 | * for. | |
473 | */ | |
474 | if (update & GPIOD_FLAGS_BIT_DIR_SET) { | |
475 | enum gpiod_flags diff = *flags ^ update; | |
476 | ||
477 | /* | |
478 | * Check if caller supplied incompatible GPIO initialization | |
479 | * flags. | |
480 | * | |
481 | * Return %-EINVAL to notify that firmware has different | |
482 | * settings and we are going to use them. | |
483 | */ | |
484 | if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) || | |
485 | ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL))) | |
486 | ret = -EINVAL; | |
487 | *flags = update; | |
488 | } | |
489 | return ret; | |
490 | } | |
491 | ||
12028d2d MW |
492 | struct acpi_gpio_lookup { |
493 | struct acpi_gpio_info info; | |
494 | int index; | |
0d9a693c | 495 | int pin_index; |
d079524a RW |
496 | bool active_low; |
497 | struct acpi_device *adev; | |
936e15dd | 498 | struct gpio_desc *desc; |
12028d2d MW |
499 | int n; |
500 | }; | |
501 | ||
031ba28a | 502 | static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) |
12028d2d MW |
503 | { |
504 | struct acpi_gpio_lookup *lookup = data; | |
505 | ||
506 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
507 | return 1; | |
508 | ||
936e15dd | 509 | if (lookup->n++ == lookup->index && !lookup->desc) { |
12028d2d | 510 | const struct acpi_resource_gpio *agpio = &ares->data.gpio; |
0d9a693c MW |
511 | int pin_index = lookup->pin_index; |
512 | ||
513 | if (pin_index >= agpio->pin_table_length) | |
514 | return 1; | |
12028d2d | 515 | |
936e15dd | 516 | lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, |
0d9a693c | 517 | agpio->pin_table[pin_index]); |
12028d2d MW |
518 | lookup->info.gpioint = |
519 | agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; | |
0d9a693c MW |
520 | |
521 | /* | |
e567c35f AS |
522 | * Polarity and triggering are only specified for GpioInt |
523 | * resource. | |
52044723 CR |
524 | * Note: we expect here: |
525 | * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW | |
526 | * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH | |
0d9a693c | 527 | */ |
52044723 | 528 | if (lookup->info.gpioint) { |
a31f5c3a | 529 | lookup->info.flags = GPIOD_IN; |
52044723 CR |
530 | lookup->info.polarity = agpio->polarity; |
531 | lookup->info.triggering = agpio->triggering; | |
a31f5c3a AS |
532 | } else { |
533 | lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio); | |
52044723 CR |
534 | } |
535 | ||
12028d2d MW |
536 | } |
537 | ||
538 | return 1; | |
539 | } | |
540 | ||
d079524a RW |
541 | static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup, |
542 | struct acpi_gpio_info *info) | |
543 | { | |
544 | struct list_head res_list; | |
545 | int ret; | |
546 | ||
547 | INIT_LIST_HEAD(&res_list); | |
548 | ||
031ba28a LW |
549 | ret = acpi_dev_get_resources(lookup->adev, &res_list, |
550 | acpi_populate_gpio_lookup, | |
d079524a RW |
551 | lookup); |
552 | if (ret < 0) | |
553 | return ret; | |
554 | ||
555 | acpi_dev_free_resource_list(&res_list); | |
556 | ||
557 | if (!lookup->desc) | |
558 | return -ENOENT; | |
559 | ||
560 | if (info) { | |
561 | *info = lookup->info; | |
562 | if (lookup->active_low) | |
52044723 | 563 | info->polarity = lookup->active_low; |
d079524a RW |
564 | } |
565 | return 0; | |
566 | } | |
567 | ||
504a3374 | 568 | static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, |
d079524a RW |
569 | const char *propname, int index, |
570 | struct acpi_gpio_lookup *lookup) | |
571 | { | |
572 | struct acpi_reference_args args; | |
573 | int ret; | |
574 | ||
575 | memset(&args, 0, sizeof(args)); | |
6f7194a1 MW |
576 | ret = __acpi_node_get_property_reference(fwnode, propname, index, 3, |
577 | &args); | |
504a3374 RW |
578 | if (ret) { |
579 | struct acpi_device *adev = to_acpi_device_node(fwnode); | |
d079524a | 580 | |
504a3374 RW |
581 | if (!adev) |
582 | return ret; | |
583 | ||
584 | if (!acpi_get_driver_gpio_data(adev, propname, index, &args)) | |
585 | return ret; | |
586 | } | |
d079524a RW |
587 | /* |
588 | * The property was found and resolved, so need to lookup the GPIO based | |
589 | * on returned args. | |
590 | */ | |
591 | lookup->adev = args.adev; | |
6f7194a1 MW |
592 | if (args.nargs != 3) |
593 | return -EPROTO; | |
594 | ||
595 | lookup->index = args.args[0]; | |
596 | lookup->pin_index = args.args[1]; | |
597 | lookup->active_low = !!args.args[2]; | |
598 | ||
d079524a RW |
599 | return 0; |
600 | } | |
601 | ||
12028d2d | 602 | /** |
936e15dd | 603 | * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources |
0d9a693c MW |
604 | * @adev: pointer to a ACPI device to get GPIO from |
605 | * @propname: Property name of the GPIO (optional) | |
12028d2d MW |
606 | * @index: index of GpioIo/GpioInt resource (starting from %0) |
607 | * @info: info pointer to fill in (optional) | |
608 | * | |
0d9a693c | 609 | * Function goes through ACPI resources for @adev and based on @index looks |
936e15dd | 610 | * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, |
12028d2d MW |
611 | * and returns it. @index matches GpioIo/GpioInt resources only so if there |
612 | * are total %3 GPIO resources, the index goes from %0 to %2. | |
613 | * | |
0d9a693c MW |
614 | * If @propname is specified the GPIO is looked using device property. In |
615 | * that case @index is used to select the GPIO entry in the property value | |
616 | * (in case of multiple). | |
617 | * | |
936e15dd | 618 | * If the GPIO cannot be translated or there is an error an ERR_PTR is |
12028d2d MW |
619 | * returned. |
620 | * | |
621 | * Note: if the GPIO resource has multiple entries in the pin list, this | |
622 | * function only returns the first. | |
623 | */ | |
031ba28a | 624 | static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
0d9a693c | 625 | const char *propname, int index, |
936e15dd | 626 | struct acpi_gpio_info *info) |
12028d2d MW |
627 | { |
628 | struct acpi_gpio_lookup lookup; | |
12028d2d MW |
629 | int ret; |
630 | ||
0d9a693c | 631 | if (!adev) |
936e15dd | 632 | return ERR_PTR(-ENODEV); |
12028d2d MW |
633 | |
634 | memset(&lookup, 0, sizeof(lookup)); | |
635 | lookup.index = index; | |
12028d2d | 636 | |
0d9a693c | 637 | if (propname) { |
0d9a693c MW |
638 | dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname); |
639 | ||
504a3374 RW |
640 | ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev), |
641 | propname, index, &lookup); | |
d079524a RW |
642 | if (ret) |
643 | return ERR_PTR(ret); | |
0d9a693c | 644 | |
d079524a RW |
645 | dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n", |
646 | dev_name(&lookup.adev->dev), lookup.index, | |
647 | lookup.pin_index, lookup.active_low); | |
0d9a693c MW |
648 | } else { |
649 | dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index); | |
d079524a | 650 | lookup.adev = adev; |
0d9a693c MW |
651 | } |
652 | ||
d079524a RW |
653 | ret = acpi_gpio_resource_lookup(&lookup, info); |
654 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 655 | } |
664e3e5a | 656 | |
031ba28a LW |
657 | struct gpio_desc *acpi_find_gpio(struct device *dev, |
658 | const char *con_id, | |
659 | unsigned int idx, | |
a31f5c3a | 660 | enum gpiod_flags *dflags, |
031ba28a LW |
661 | enum gpio_lookup_flags *lookupflags) |
662 | { | |
663 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
664 | struct acpi_gpio_info info; | |
665 | struct gpio_desc *desc; | |
666 | char propname[32]; | |
a31f5c3a | 667 | int err; |
031ba28a LW |
668 | int i; |
669 | ||
670 | /* Try first from _DSD */ | |
671 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 672 | if (con_id) { |
031ba28a LW |
673 | snprintf(propname, sizeof(propname), "%s-%s", |
674 | con_id, gpio_suffixes[i]); | |
675 | } else { | |
676 | snprintf(propname, sizeof(propname), "%s", | |
677 | gpio_suffixes[i]); | |
678 | } | |
679 | ||
680 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
693bdaa1 | 681 | if (!IS_ERR(desc)) |
031ba28a | 682 | break; |
693bdaa1 DT |
683 | if (PTR_ERR(desc) == -EPROBE_DEFER) |
684 | return ERR_CAST(desc); | |
031ba28a LW |
685 | } |
686 | ||
687 | /* Then from plain _CRS GPIOs */ | |
688 | if (IS_ERR(desc)) { | |
689 | if (!acpi_can_fallback_to_crs(adev, con_id)) | |
690 | return ERR_PTR(-ENOENT); | |
691 | ||
692 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); | |
693 | if (IS_ERR(desc)) | |
694 | return desc; | |
fe06b56c | 695 | } |
031ba28a | 696 | |
fe06b56c | 697 | if (info.gpioint && |
a31f5c3a | 698 | (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) { |
fe06b56c AS |
699 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); |
700 | return ERR_PTR(-ENOENT); | |
031ba28a LW |
701 | } |
702 | ||
703 | if (info.polarity == GPIO_ACTIVE_LOW) | |
704 | *lookupflags |= GPIO_ACTIVE_LOW; | |
705 | ||
a31f5c3a AS |
706 | err = acpi_gpio_update_gpiod_flags(dflags, info.flags); |
707 | if (err) | |
708 | dev_dbg(dev, "Override GPIO initialization flags\n"); | |
709 | ||
031ba28a LW |
710 | return desc; |
711 | } | |
712 | ||
504a3374 RW |
713 | /** |
714 | * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources | |
715 | * @fwnode: pointer to an ACPI firmware node to get the GPIO information from | |
716 | * @propname: Property name of the GPIO | |
717 | * @index: index of GpioIo/GpioInt resource (starting from %0) | |
718 | * @info: info pointer to fill in (optional) | |
719 | * | |
720 | * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it. | |
721 | * Otherwise (ie. it is a data-only non-device object), use the property-based | |
722 | * GPIO lookup to get to the GPIO resource with the relevant information and use | |
723 | * that to obtain the GPIO descriptor to return. | |
724 | */ | |
725 | struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, | |
726 | const char *propname, int index, | |
727 | struct acpi_gpio_info *info) | |
728 | { | |
729 | struct acpi_gpio_lookup lookup; | |
730 | struct acpi_device *adev; | |
731 | int ret; | |
12028d2d | 732 | |
504a3374 RW |
733 | adev = to_acpi_device_node(fwnode); |
734 | if (adev) | |
735 | return acpi_get_gpiod_by_index(adev, propname, index, info); | |
12028d2d | 736 | |
504a3374 RW |
737 | if (!is_acpi_data_node(fwnode)) |
738 | return ERR_PTR(-ENODEV); | |
739 | ||
740 | if (!propname) | |
741 | return ERR_PTR(-EINVAL); | |
742 | ||
743 | memset(&lookup, 0, sizeof(lookup)); | |
744 | lookup.index = index; | |
745 | ||
746 | ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); | |
747 | if (ret) | |
748 | return ERR_PTR(ret); | |
12028d2d | 749 | |
504a3374 RW |
750 | ret = acpi_gpio_resource_lookup(&lookup, info); |
751 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 752 | } |
664e3e5a | 753 | |
c884fbd4 MW |
754 | /** |
755 | * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number | |
756 | * @adev: pointer to a ACPI device to get IRQ from | |
757 | * @index: index of GpioInt resource (starting from %0) | |
758 | * | |
759 | * If the device has one or more GpioInt resources, this function can be | |
760 | * used to translate from the GPIO offset in the resource to the Linux IRQ | |
761 | * number. | |
762 | * | |
a31f5c3a AS |
763 | * The function is idempotent, though each time it runs it will configure GPIO |
764 | * pin direction according to the flags in GpioInt resource. | |
765 | * | |
db05c7ef | 766 | * Return: Linux IRQ number (> %0) on success, negative errno on failure. |
c884fbd4 MW |
767 | */ |
768 | int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) | |
769 | { | |
770 | int idx, i; | |
52044723 | 771 | unsigned int irq_flags; |
a31f5c3a | 772 | int ret; |
c884fbd4 MW |
773 | |
774 | for (i = 0, idx = 0; idx <= index; i++) { | |
775 | struct acpi_gpio_info info; | |
776 | struct gpio_desc *desc; | |
777 | ||
778 | desc = acpi_get_gpiod_by_index(adev, NULL, i, &info); | |
6798d727 HG |
779 | |
780 | /* Ignore -EPROBE_DEFER, it only matters if idx matches */ | |
781 | if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) | |
782 | return PTR_ERR(desc); | |
783 | ||
52044723 | 784 | if (info.gpioint && idx++ == index) { |
a31f5c3a | 785 | char label[32]; |
6798d727 | 786 | int irq; |
52044723 | 787 | |
6798d727 HG |
788 | if (IS_ERR(desc)) |
789 | return PTR_ERR(desc); | |
52044723 | 790 | |
6798d727 | 791 | irq = gpiod_to_irq(desc); |
52044723 CR |
792 | if (irq < 0) |
793 | return irq; | |
794 | ||
a31f5c3a AS |
795 | snprintf(label, sizeof(label), "GpioInt() %d", index); |
796 | ret = gpiod_configure_flags(desc, label, 0, info.flags); | |
797 | if (ret < 0) | |
798 | return ret; | |
799 | ||
52044723 CR |
800 | irq_flags = acpi_dev_get_irq_type(info.triggering, |
801 | info.polarity); | |
802 | ||
803 | /* Set type if specified and different than the current one */ | |
804 | if (irq_flags != IRQ_TYPE_NONE && | |
805 | irq_flags != irq_get_trigger_type(irq)) | |
806 | irq_set_irq_type(irq, irq_flags); | |
807 | ||
808 | return irq; | |
809 | } | |
810 | ||
c884fbd4 | 811 | } |
6798d727 | 812 | return -ENOENT; |
c884fbd4 MW |
813 | } |
814 | EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get); | |
815 | ||
473ed7be MW |
816 | static acpi_status |
817 | acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, | |
818 | u32 bits, u64 *value, void *handler_context, | |
819 | void *region_context) | |
820 | { | |
821 | struct acpi_gpio_chip *achip = region_context; | |
822 | struct gpio_chip *chip = achip->chip; | |
823 | struct acpi_resource_gpio *agpio; | |
824 | struct acpi_resource *ares; | |
c15d821d | 825 | int pin_index = (int)address; |
473ed7be | 826 | acpi_status status; |
c15d821d | 827 | int length; |
473ed7be MW |
828 | int i; |
829 | ||
830 | status = acpi_buffer_to_resource(achip->conn_info.connection, | |
831 | achip->conn_info.length, &ares); | |
832 | if (ACPI_FAILURE(status)) | |
833 | return status; | |
834 | ||
835 | if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { | |
836 | ACPI_FREE(ares); | |
837 | return AE_BAD_PARAMETER; | |
838 | } | |
839 | ||
840 | agpio = &ares->data.gpio; | |
473ed7be MW |
841 | |
842 | if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && | |
843 | function == ACPI_WRITE)) { | |
844 | ACPI_FREE(ares); | |
845 | return AE_BAD_PARAMETER; | |
846 | } | |
847 | ||
c15d821d SP |
848 | length = min(agpio->pin_table_length, (u16)(pin_index + bits)); |
849 | for (i = pin_index; i < length; ++i) { | |
a4811622 | 850 | int pin = agpio->pin_table[i]; |
473ed7be MW |
851 | struct acpi_gpio_connection *conn; |
852 | struct gpio_desc *desc; | |
853 | bool found; | |
854 | ||
20ec3e39 | 855 | pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin); |
4de60970 | 856 | if (pin < 0) { |
857 | status = AE_BAD_PARAMETER; | |
858 | goto out; | |
859 | } | |
860 | ||
473ed7be MW |
861 | mutex_lock(&achip->conn_lock); |
862 | ||
863 | found = false; | |
864 | list_for_each_entry(conn, &achip->conns, node) { | |
e46cf32c | 865 | if (conn->pin == pin) { |
473ed7be | 866 | found = true; |
e46cf32c | 867 | desc = conn->desc; |
473ed7be MW |
868 | break; |
869 | } | |
870 | } | |
c103a10f MW |
871 | |
872 | /* | |
873 | * The same GPIO can be shared between operation region and | |
874 | * event but only if the access here is ACPI_READ. In that | |
875 | * case we "borrow" the event GPIO instead. | |
876 | */ | |
877 | if (!found && agpio->sharable == ACPI_SHARED && | |
878 | function == ACPI_READ) { | |
879 | struct acpi_gpio_event *event; | |
880 | ||
881 | list_for_each_entry(event, &achip->events, node) { | |
882 | if (event->pin == pin) { | |
883 | desc = event->desc; | |
884 | found = true; | |
885 | break; | |
886 | } | |
887 | } | |
888 | } | |
889 | ||
473ed7be | 890 | if (!found) { |
2eca25af AS |
891 | enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio); |
892 | const char *label = "ACPI:OpRegion"; | |
893 | int err; | |
894 | ||
895 | desc = gpiochip_request_own_desc(chip, pin, label); | |
e46cf32c | 896 | if (IS_ERR(desc)) { |
473ed7be MW |
897 | status = AE_ERROR; |
898 | mutex_unlock(&achip->conn_lock); | |
899 | goto out; | |
900 | } | |
901 | ||
2eca25af AS |
902 | err = gpiod_configure_flags(desc, label, 0, flags); |
903 | if (err < 0) { | |
904 | status = AE_NOT_CONFIGURED; | |
905 | gpiochip_free_own_desc(desc); | |
906 | mutex_unlock(&achip->conn_lock); | |
907 | goto out; | |
473ed7be MW |
908 | } |
909 | ||
910 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); | |
911 | if (!conn) { | |
912 | status = AE_NO_MEMORY; | |
913 | gpiochip_free_own_desc(desc); | |
914 | mutex_unlock(&achip->conn_lock); | |
915 | goto out; | |
916 | } | |
917 | ||
e46cf32c | 918 | conn->pin = pin; |
473ed7be MW |
919 | conn->desc = desc; |
920 | list_add_tail(&conn->node, &achip->conns); | |
921 | } | |
922 | ||
923 | mutex_unlock(&achip->conn_lock); | |
924 | ||
925 | if (function == ACPI_WRITE) | |
dc62b56a AL |
926 | gpiod_set_raw_value_cansleep(desc, |
927 | !!((1 << i) & *value)); | |
473ed7be | 928 | else |
dc62b56a | 929 | *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; |
473ed7be MW |
930 | } |
931 | ||
932 | out: | |
933 | ACPI_FREE(ares); | |
934 | return status; | |
935 | } | |
936 | ||
937 | static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) | |
938 | { | |
939 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 940 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
941 | acpi_status status; |
942 | ||
943 | INIT_LIST_HEAD(&achip->conns); | |
944 | mutex_init(&achip->conn_lock); | |
945 | status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
946 | acpi_gpio_adr_space_handler, | |
947 | NULL, achip); | |
948 | if (ACPI_FAILURE(status)) | |
58383c78 LW |
949 | dev_err(chip->parent, |
950 | "Failed to install GPIO OpRegion handler\n"); | |
473ed7be MW |
951 | } |
952 | ||
953 | static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) | |
954 | { | |
955 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 956 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
957 | struct acpi_gpio_connection *conn, *tmp; |
958 | acpi_status status; | |
959 | ||
960 | status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
961 | acpi_gpio_adr_space_handler); | |
962 | if (ACPI_FAILURE(status)) { | |
58383c78 LW |
963 | dev_err(chip->parent, |
964 | "Failed to remove GPIO OpRegion handler\n"); | |
473ed7be MW |
965 | return; |
966 | } | |
967 | ||
968 | list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { | |
969 | gpiochip_free_own_desc(conn->desc); | |
970 | list_del(&conn->node); | |
971 | kfree(conn); | |
972 | } | |
973 | } | |
974 | ||
550a9532 WY |
975 | static struct gpio_desc *acpi_gpiochip_parse_own_gpio( |
976 | struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode, | |
977 | const char **name, unsigned int *lflags, unsigned int *dflags) | |
c80f1ba7 MW |
978 | { |
979 | struct gpio_chip *chip = achip->chip; | |
980 | struct gpio_desc *desc; | |
981 | u32 gpios[2]; | |
982 | int ret; | |
983 | ||
c82064f2 AB |
984 | *lflags = 0; |
985 | *dflags = 0; | |
986 | *name = NULL; | |
987 | ||
c80f1ba7 MW |
988 | ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, |
989 | ARRAY_SIZE(gpios)); | |
990 | if (ret < 0) | |
991 | return ERR_PTR(ret); | |
992 | ||
993 | ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]); | |
994 | if (ret < 0) | |
995 | return ERR_PTR(ret); | |
996 | ||
997 | desc = gpiochip_get_desc(chip, ret); | |
998 | if (IS_ERR(desc)) | |
999 | return desc; | |
1000 | ||
c80f1ba7 MW |
1001 | if (gpios[1]) |
1002 | *lflags |= GPIO_ACTIVE_LOW; | |
1003 | ||
1004 | if (fwnode_property_present(fwnode, "input")) | |
1005 | *dflags |= GPIOD_IN; | |
1006 | else if (fwnode_property_present(fwnode, "output-low")) | |
1007 | *dflags |= GPIOD_OUT_LOW; | |
1008 | else if (fwnode_property_present(fwnode, "output-high")) | |
1009 | *dflags |= GPIOD_OUT_HIGH; | |
1010 | else | |
1011 | return ERR_PTR(-EINVAL); | |
1012 | ||
1013 | fwnode_property_read_string(fwnode, "line-name", name); | |
1014 | ||
1015 | return desc; | |
1016 | } | |
1017 | ||
1018 | static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip) | |
1019 | { | |
1020 | struct gpio_chip *chip = achip->chip; | |
1021 | struct fwnode_handle *fwnode; | |
1022 | ||
1023 | device_for_each_child_node(chip->parent, fwnode) { | |
1024 | unsigned int lflags, dflags; | |
1025 | struct gpio_desc *desc; | |
1026 | const char *name; | |
1027 | int ret; | |
1028 | ||
1029 | if (!fwnode_property_present(fwnode, "gpio-hog")) | |
1030 | continue; | |
1031 | ||
1032 | desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name, | |
1033 | &lflags, &dflags); | |
1034 | if (IS_ERR(desc)) | |
1035 | continue; | |
1036 | ||
1037 | ret = gpiod_hog(desc, name, lflags, dflags); | |
1038 | if (ret) { | |
1039 | dev_err(chip->parent, "Failed to hog GPIO\n"); | |
1b6998c9 | 1040 | fwnode_handle_put(fwnode); |
c80f1ba7 MW |
1041 | return; |
1042 | } | |
1043 | } | |
1044 | } | |
1045 | ||
664e3e5a MW |
1046 | void acpi_gpiochip_add(struct gpio_chip *chip) |
1047 | { | |
aa92b6f6 MW |
1048 | struct acpi_gpio_chip *acpi_gpio; |
1049 | acpi_handle handle; | |
1050 | acpi_status status; | |
1051 | ||
58383c78 | 1052 | if (!chip || !chip->parent) |
e9595f84 MW |
1053 | return; |
1054 | ||
58383c78 | 1055 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1056 | if (!handle) |
1057 | return; | |
1058 | ||
1059 | acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); | |
1060 | if (!acpi_gpio) { | |
58383c78 | 1061 | dev_err(chip->parent, |
aa92b6f6 MW |
1062 | "Failed to allocate memory for ACPI GPIO chip\n"); |
1063 | return; | |
1064 | } | |
1065 | ||
1066 | acpi_gpio->chip = chip; | |
c103a10f | 1067 | INIT_LIST_HEAD(&acpi_gpio->events); |
aa92b6f6 MW |
1068 | |
1069 | status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); | |
1070 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1071 | dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n"); |
aa92b6f6 MW |
1072 | kfree(acpi_gpio); |
1073 | return; | |
1074 | } | |
1075 | ||
4035cc15 MW |
1076 | if (!chip->names) |
1077 | devprop_gpiochip_set_names(chip); | |
1078 | ||
473ed7be | 1079 | acpi_gpiochip_request_regions(acpi_gpio); |
c80f1ba7 | 1080 | acpi_gpiochip_scan_gpios(acpi_gpio); |
3f86a635 | 1081 | acpi_walk_dep_device_list(handle); |
664e3e5a MW |
1082 | } |
1083 | ||
1084 | void acpi_gpiochip_remove(struct gpio_chip *chip) | |
1085 | { | |
aa92b6f6 MW |
1086 | struct acpi_gpio_chip *acpi_gpio; |
1087 | acpi_handle handle; | |
1088 | acpi_status status; | |
1089 | ||
58383c78 | 1090 | if (!chip || !chip->parent) |
e9595f84 MW |
1091 | return; |
1092 | ||
58383c78 | 1093 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1094 | if (!handle) |
1095 | return; | |
1096 | ||
1097 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
1098 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1099 | dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n"); |
aa92b6f6 MW |
1100 | return; |
1101 | } | |
1102 | ||
473ed7be | 1103 | acpi_gpiochip_free_regions(acpi_gpio); |
aa92b6f6 MW |
1104 | |
1105 | acpi_detach_data(handle, acpi_gpio_chip_dh); | |
1106 | kfree(acpi_gpio); | |
664e3e5a | 1107 | } |
66858527 | 1108 | |
6f7194a1 | 1109 | static int acpi_gpio_package_count(const union acpi_object *obj) |
66858527 RI |
1110 | { |
1111 | const union acpi_object *element = obj->package.elements; | |
1112 | const union acpi_object *end = element + obj->package.count; | |
1113 | unsigned int count = 0; | |
1114 | ||
1115 | while (element < end) { | |
6f7194a1 MW |
1116 | switch (element->type) { |
1117 | case ACPI_TYPE_LOCAL_REFERENCE: | |
1118 | element += 3; | |
1119 | /* Fallthrough */ | |
1120 | case ACPI_TYPE_INTEGER: | |
1121 | element++; | |
66858527 | 1122 | count++; |
6f7194a1 | 1123 | break; |
66858527 | 1124 | |
6f7194a1 MW |
1125 | default: |
1126 | return -EPROTO; | |
1127 | } | |
66858527 | 1128 | } |
6f7194a1 | 1129 | |
66858527 RI |
1130 | return count; |
1131 | } | |
1132 | ||
1133 | static int acpi_find_gpio_count(struct acpi_resource *ares, void *data) | |
1134 | { | |
1135 | unsigned int *count = data; | |
1136 | ||
1137 | if (ares->type == ACPI_RESOURCE_TYPE_GPIO) | |
1138 | *count += ares->data.gpio.pin_table_length; | |
1139 | ||
1140 | return 1; | |
1141 | } | |
1142 | ||
1143 | /** | |
1144 | * acpi_gpio_count - return the number of GPIOs associated with a | |
1145 | * device / function or -ENOENT if no GPIO has been | |
1146 | * assigned to the requested function. | |
1147 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
1148 | * @con_id: function within the GPIO consumer | |
1149 | */ | |
1150 | int acpi_gpio_count(struct device *dev, const char *con_id) | |
1151 | { | |
1152 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1153 | const union acpi_object *obj; | |
1154 | const struct acpi_gpio_mapping *gm; | |
1155 | int count = -ENOENT; | |
1156 | int ret; | |
1157 | char propname[32]; | |
1158 | unsigned int i; | |
1159 | ||
1160 | /* Try first from _DSD */ | |
1161 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 1162 | if (con_id) |
66858527 RI |
1163 | snprintf(propname, sizeof(propname), "%s-%s", |
1164 | con_id, gpio_suffixes[i]); | |
1165 | else | |
1166 | snprintf(propname, sizeof(propname), "%s", | |
1167 | gpio_suffixes[i]); | |
1168 | ||
1169 | ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY, | |
1170 | &obj); | |
1171 | if (ret == 0) { | |
1172 | if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) | |
1173 | count = 1; | |
1174 | else if (obj->type == ACPI_TYPE_PACKAGE) | |
1175 | count = acpi_gpio_package_count(obj); | |
1176 | } else if (adev->driver_gpios) { | |
1177 | for (gm = adev->driver_gpios; gm->name; gm++) | |
1178 | if (strcmp(propname, gm->name) == 0) { | |
1179 | count = gm->size; | |
1180 | break; | |
1181 | } | |
1182 | } | |
4ed55016 | 1183 | if (count > 0) |
66858527 RI |
1184 | break; |
1185 | } | |
1186 | ||
1187 | /* Then from plain _CRS GPIOs */ | |
1188 | if (count < 0) { | |
1189 | struct list_head resource_list; | |
1190 | unsigned int crs_count = 0; | |
1191 | ||
6fe9da42 AS |
1192 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
1193 | return count; | |
1194 | ||
66858527 RI |
1195 | INIT_LIST_HEAD(&resource_list); |
1196 | acpi_dev_get_resources(adev, &resource_list, | |
1197 | acpi_find_gpio_count, &crs_count); | |
1198 | acpi_dev_free_resource_list(&resource_list); | |
1199 | if (crs_count > 0) | |
1200 | count = crs_count; | |
1201 | } | |
4ed55016 | 1202 | return count ? count : -ENOENT; |
66858527 | 1203 | } |
10cf4899 | 1204 | |
10cf4899 DT |
1205 | bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) |
1206 | { | |
10cf4899 DT |
1207 | /* Never allow fallback if the device has properties */ |
1208 | if (adev->data.properties || adev->driver_gpios) | |
1209 | return false; | |
1210 | ||
f10e4bf6 | 1211 | return con_id == NULL; |
10cf4899 | 1212 | } |