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dae5f0af | 1 | // SPDX-License-Identifier: GPL-2.0 |
e29482e8 MN |
2 | /* |
3 | * ACPI helpers for GPIO API | |
4 | * | |
5 | * Copyright (C) 2012, Intel Corporation | |
6 | * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> | |
7 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
e29482e8 MN |
8 | */ |
9 | ||
10 | #include <linux/errno.h> | |
936e15dd | 11 | #include <linux/gpio/consumer.h> |
5ccff852 | 12 | #include <linux/gpio/driver.h> |
031ba28a | 13 | #include <linux/gpio/machine.h> |
e29482e8 | 14 | #include <linux/export.h> |
e29482e8 | 15 | #include <linux/acpi.h> |
0d1c28a4 | 16 | #include <linux/interrupt.h> |
473ed7be | 17 | #include <linux/mutex.h> |
354567e6 | 18 | #include <linux/pinctrl/pinctrl.h> |
e29482e8 | 19 | |
5ccff852 | 20 | #include "gpiolib.h" |
77cb907a | 21 | #include "gpiolib-acpi.h" |
5ccff852 | 22 | |
e59f5e08 HG |
23 | /** |
24 | * struct acpi_gpio_event - ACPI GPIO event handler data | |
25 | * | |
26 | * @node: list-entry of the events list of the struct acpi_gpio_chip | |
27 | * @handle: handle of ACPI method to execute when the IRQ triggers | |
85edcd01 AS |
28 | * @handler: handler function to pass to request_irq() when requesting the IRQ |
29 | * @pin: GPIO pin number on the struct gpio_chip | |
30 | * @irq: Linux IRQ number for the event, for request_irq() / free_irq() | |
31 | * @irqflags: flags to pass to request_irq() when requesting the IRQ | |
e59f5e08 | 32 | * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source |
85edcd01 AS |
33 | * @irq_requested:True if request_irq() has been done |
34 | * @desc: struct gpio_desc for the GPIO pin for this event | |
e59f5e08 | 35 | */ |
4b01a14b | 36 | struct acpi_gpio_event { |
7fc7acb9 | 37 | struct list_head node; |
4b01a14b | 38 | acpi_handle handle; |
e59f5e08 | 39 | irq_handler_t handler; |
7fc7acb9 RW |
40 | unsigned int pin; |
41 | unsigned int irq; | |
e59f5e08 HG |
42 | unsigned long irqflags; |
43 | bool irq_is_wake; | |
44 | bool irq_requested; | |
e46cf32c | 45 | struct gpio_desc *desc; |
7fc7acb9 RW |
46 | }; |
47 | ||
473ed7be MW |
48 | struct acpi_gpio_connection { |
49 | struct list_head node; | |
e46cf32c | 50 | unsigned int pin; |
473ed7be MW |
51 | struct gpio_desc *desc; |
52 | }; | |
53 | ||
aa92b6f6 | 54 | struct acpi_gpio_chip { |
473ed7be MW |
55 | /* |
56 | * ACPICA requires that the first field of the context parameter | |
57 | * passed to acpi_install_address_space_handler() is large enough | |
58 | * to hold struct acpi_connection_info. | |
59 | */ | |
60 | struct acpi_connection_info conn_info; | |
61 | struct list_head conns; | |
62 | struct mutex conn_lock; | |
aa92b6f6 | 63 | struct gpio_chip *chip; |
4b01a14b | 64 | struct list_head events; |
78d3a92e | 65 | struct list_head deferred_req_irqs_list_entry; |
aa92b6f6 MW |
66 | }; |
67 | ||
78d3a92e | 68 | /* |
85edcd01 | 69 | * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init |
e59f5e08 | 70 | * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a |
85edcd01 AS |
71 | * late_initcall_sync() handler, so that other builtin drivers can register their |
72 | * OpRegions before the event handlers can run. This list contains GPIO chips | |
e59f5e08 | 73 | * for which the acpi_gpiochip_request_irqs() call has been deferred. |
78d3a92e HG |
74 | */ |
75 | static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock); | |
76 | static LIST_HEAD(acpi_gpio_deferred_req_irqs_list); | |
77 | static bool acpi_gpio_deferred_req_irqs_done; | |
ca876c74 | 78 | |
e29482e8 MN |
79 | static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) |
80 | { | |
58383c78 | 81 | if (!gc->parent) |
e29482e8 MN |
82 | return false; |
83 | ||
58383c78 | 84 | return ACPI_HANDLE(gc->parent) == data; |
e29482e8 MN |
85 | } |
86 | ||
87 | /** | |
936e15dd | 88 | * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API |
e29482e8 MN |
89 | * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") |
90 | * @pin: ACPI GPIO pin number (0-based, controller-relative) | |
91 | * | |
f35bbf61 MW |
92 | * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR |
93 | * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO | |
85edcd01 | 94 | * controller does not have GPIO chip registered at the moment. This is to |
f35bbf61 | 95 | * support probe deferral. |
e29482e8 | 96 | */ |
936e15dd | 97 | static struct gpio_desc *acpi_get_gpiod(char *path, int pin) |
e29482e8 MN |
98 | { |
99 | struct gpio_chip *chip; | |
100 | acpi_handle handle; | |
101 | acpi_status status; | |
102 | ||
103 | status = acpi_get_handle(NULL, path, &handle); | |
104 | if (ACPI_FAILURE(status)) | |
936e15dd | 105 | return ERR_PTR(-ENODEV); |
e29482e8 MN |
106 | |
107 | chip = gpiochip_find(handle, acpi_gpiochip_find); | |
108 | if (!chip) | |
f35bbf61 | 109 | return ERR_PTR(-EPROBE_DEFER); |
e29482e8 | 110 | |
03c4749d | 111 | return gpiochip_get_desc(chip, pin); |
e29482e8 | 112 | } |
0d1c28a4 | 113 | |
0d1c28a4 MN |
114 | static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) |
115 | { | |
6072b9dc | 116 | struct acpi_gpio_event *event = data; |
0d1c28a4 | 117 | |
6072b9dc | 118 | acpi_evaluate_object(event->handle, NULL, NULL, NULL); |
0d1c28a4 MN |
119 | |
120 | return IRQ_HANDLED; | |
121 | } | |
122 | ||
7fc7acb9 RW |
123 | static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) |
124 | { | |
4b01a14b | 125 | struct acpi_gpio_event *event = data; |
7fc7acb9 | 126 | |
4b01a14b | 127 | acpi_execute_simple_method(event->handle, NULL, event->pin); |
7fc7acb9 RW |
128 | |
129 | return IRQ_HANDLED; | |
130 | } | |
131 | ||
aa92b6f6 | 132 | static void acpi_gpio_chip_dh(acpi_handle handle, void *data) |
7fc7acb9 RW |
133 | { |
134 | /* The address of this function is used as a key. */ | |
135 | } | |
136 | ||
25e3ef89 AS |
137 | bool acpi_gpio_get_irq_resource(struct acpi_resource *ares, |
138 | struct acpi_resource_gpio **agpio) | |
139 | { | |
140 | struct acpi_resource_gpio *gpio; | |
141 | ||
142 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
143 | return false; | |
144 | ||
145 | gpio = &ares->data.gpio; | |
146 | if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) | |
147 | return false; | |
148 | ||
149 | *agpio = gpio; | |
150 | return true; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource); | |
153 | ||
e59f5e08 HG |
154 | static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio, |
155 | struct acpi_gpio_event *event) | |
156 | { | |
157 | int ret, value; | |
158 | ||
159 | ret = request_threaded_irq(event->irq, NULL, event->handler, | |
160 | event->irqflags, "ACPI:Event", event); | |
161 | if (ret) { | |
162 | dev_err(acpi_gpio->chip->parent, | |
163 | "Failed to setup interrupt handler for %d\n", | |
164 | event->irq); | |
165 | return; | |
166 | } | |
167 | ||
168 | if (event->irq_is_wake) | |
169 | enable_irq_wake(event->irq); | |
170 | ||
171 | event->irq_requested = true; | |
172 | ||
173 | /* Make sure we trigger the initial state of edge-triggered IRQs */ | |
174 | value = gpiod_get_raw_value_cansleep(event->desc); | |
175 | if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) || | |
176 | ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0)) | |
177 | event->handler(event->irq, event); | |
178 | } | |
179 | ||
180 | static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio) | |
181 | { | |
182 | struct acpi_gpio_event *event; | |
183 | ||
184 | list_for_each_entry(event, &acpi_gpio->events, node) | |
185 | acpi_gpiochip_request_irq(acpi_gpio, event); | |
186 | } | |
187 | ||
188 | static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares, | |
189 | void *context) | |
0d1c28a4 | 190 | { |
6072b9dc | 191 | struct acpi_gpio_chip *acpi_gpio = context; |
aa92b6f6 | 192 | struct gpio_chip *chip = acpi_gpio->chip; |
6072b9dc | 193 | struct acpi_resource_gpio *agpio; |
7fc7acb9 | 194 | acpi_handle handle, evt_handle; |
6072b9dc MW |
195 | struct acpi_gpio_event *event; |
196 | irq_handler_t handler = NULL; | |
197 | struct gpio_desc *desc; | |
e59f5e08 | 198 | int ret, pin, irq; |
0d1c28a4 | 199 | |
25e3ef89 | 200 | if (!acpi_gpio_get_irq_resource(ares, &agpio)) |
6072b9dc | 201 | return AE_OK; |
0d1c28a4 | 202 | |
58383c78 | 203 | handle = ACPI_HANDLE(chip->parent); |
6072b9dc MW |
204 | pin = agpio->pin_table[0]; |
205 | ||
206 | if (pin <= 255) { | |
207 | char ev_name[5]; | |
e40a3ae1 | 208 | sprintf(ev_name, "_%c%02hhX", |
6072b9dc MW |
209 | agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', |
210 | pin); | |
211 | if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) | |
212 | handler = acpi_gpio_irq_handler; | |
213 | } | |
214 | if (!handler) { | |
215 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) | |
216 | handler = acpi_gpio_irq_handler_evt; | |
217 | } | |
218 | if (!handler) | |
c06632ea | 219 | return AE_OK; |
0d1c28a4 | 220 | |
5923ea6c LW |
221 | desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", |
222 | GPIO_ACTIVE_HIGH, GPIOD_IN); | |
6072b9dc | 223 | if (IS_ERR(desc)) { |
58383c78 | 224 | dev_err(chip->parent, "Failed to request GPIO\n"); |
6072b9dc MW |
225 | return AE_ERROR; |
226 | } | |
0d1c28a4 | 227 | |
e3a2e878 | 228 | ret = gpiochip_lock_as_irq(chip, pin); |
6072b9dc | 229 | if (ret) { |
58383c78 | 230 | dev_err(chip->parent, "Failed to lock GPIO as interrupt\n"); |
6072b9dc MW |
231 | goto fail_free_desc; |
232 | } | |
0d1c28a4 | 233 | |
6072b9dc MW |
234 | irq = gpiod_to_irq(desc); |
235 | if (irq < 0) { | |
58383c78 | 236 | dev_err(chip->parent, "Failed to translate GPIO to IRQ\n"); |
6072b9dc MW |
237 | goto fail_unlock_irq; |
238 | } | |
7fc7acb9 | 239 | |
e59f5e08 HG |
240 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
241 | if (!event) | |
242 | goto fail_unlock_irq; | |
243 | ||
244 | event->irqflags = IRQF_ONESHOT; | |
6072b9dc MW |
245 | if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { |
246 | if (agpio->polarity == ACPI_ACTIVE_HIGH) | |
e59f5e08 | 247 | event->irqflags |= IRQF_TRIGGER_HIGH; |
6072b9dc | 248 | else |
e59f5e08 | 249 | event->irqflags |= IRQF_TRIGGER_LOW; |
6072b9dc MW |
250 | } else { |
251 | switch (agpio->polarity) { | |
252 | case ACPI_ACTIVE_HIGH: | |
e59f5e08 | 253 | event->irqflags |= IRQF_TRIGGER_RISING; |
6072b9dc MW |
254 | break; |
255 | case ACPI_ACTIVE_LOW: | |
e59f5e08 | 256 | event->irqflags |= IRQF_TRIGGER_FALLING; |
6072b9dc MW |
257 | break; |
258 | default: | |
e59f5e08 HG |
259 | event->irqflags |= IRQF_TRIGGER_RISING | |
260 | IRQF_TRIGGER_FALLING; | |
6072b9dc | 261 | break; |
7fc7acb9 | 262 | } |
6072b9dc | 263 | } |
aa92b6f6 | 264 | |
6072b9dc | 265 | event->handle = evt_handle; |
e59f5e08 | 266 | event->handler = handler; |
6072b9dc | 267 | event->irq = irq; |
e59f5e08 | 268 | event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE; |
6072b9dc | 269 | event->pin = pin; |
e46cf32c | 270 | event->desc = desc; |
7fc7acb9 | 271 | |
6072b9dc | 272 | list_add_tail(&event->node, &acpi_gpio->events); |
ca876c74 | 273 | |
6072b9dc MW |
274 | return AE_OK; |
275 | ||
6072b9dc | 276 | fail_unlock_irq: |
e3a2e878 | 277 | gpiochip_unlock_as_irq(chip, pin); |
6072b9dc MW |
278 | fail_free_desc: |
279 | gpiochip_free_own_desc(desc); | |
280 | ||
281 | return AE_ERROR; | |
0d1c28a4 | 282 | } |
7fc7acb9 | 283 | |
70b53411 | 284 | /** |
6072b9dc | 285 | * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events |
afa82fab | 286 | * @chip: GPIO chip |
70b53411 | 287 | * |
6072b9dc MW |
288 | * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are |
289 | * handled by ACPI event methods which need to be called from the GPIO | |
85edcd01 AS |
290 | * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which |
291 | * GPIO pins have ACPI event methods and assigns interrupt handlers that calls | |
292 | * the ACPI event methods for those pins. | |
6072b9dc | 293 | */ |
afa82fab | 294 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) |
6072b9dc | 295 | { |
afa82fab MW |
296 | struct acpi_gpio_chip *acpi_gpio; |
297 | acpi_handle handle; | |
298 | acpi_status status; | |
78d3a92e | 299 | bool defer; |
afa82fab | 300 | |
58383c78 | 301 | if (!chip->parent || !chip->to_irq) |
afa82fab | 302 | return; |
6072b9dc | 303 | |
58383c78 | 304 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
305 | if (!handle) |
306 | return; | |
307 | ||
308 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
309 | if (ACPI_FAILURE(status)) | |
6072b9dc MW |
310 | return; |
311 | ||
e59f5e08 HG |
312 | acpi_walk_resources(handle, "_AEI", |
313 | acpi_gpiochip_alloc_event, acpi_gpio); | |
314 | ||
78d3a92e HG |
315 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); |
316 | defer = !acpi_gpio_deferred_req_irqs_done; | |
317 | if (defer) | |
318 | list_add(&acpi_gpio->deferred_req_irqs_list_entry, | |
319 | &acpi_gpio_deferred_req_irqs_list); | |
320 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
321 | ||
322 | if (defer) | |
323 | return; | |
324 | ||
e59f5e08 | 325 | acpi_gpiochip_request_irqs(acpi_gpio); |
6072b9dc | 326 | } |
2b528fff | 327 | EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts); |
6072b9dc MW |
328 | |
329 | /** | |
330 | * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. | |
afa82fab | 331 | * @chip: GPIO chip |
70b53411 | 332 | * |
6072b9dc MW |
333 | * Free interrupts associated with GPIO ACPI event method for the given |
334 | * GPIO chip. | |
70b53411 | 335 | */ |
afa82fab | 336 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) |
70b53411 | 337 | { |
afa82fab | 338 | struct acpi_gpio_chip *acpi_gpio; |
4b01a14b | 339 | struct acpi_gpio_event *event, *ep; |
afa82fab MW |
340 | acpi_handle handle; |
341 | acpi_status status; | |
342 | ||
58383c78 | 343 | if (!chip->parent || !chip->to_irq) |
afa82fab | 344 | return; |
70b53411 | 345 | |
58383c78 | 346 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
347 | if (!handle) |
348 | return; | |
349 | ||
350 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
351 | if (ACPI_FAILURE(status)) | |
70b53411 MW |
352 | return; |
353 | ||
78d3a92e HG |
354 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); |
355 | if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry)) | |
356 | list_del_init(&acpi_gpio->deferred_req_irqs_list_entry); | |
357 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
358 | ||
4b01a14b | 359 | list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { |
e59f5e08 HG |
360 | if (event->irq_requested) { |
361 | if (event->irq_is_wake) | |
362 | disable_irq_wake(event->irq); | |
363 | ||
364 | free_irq(event->irq, event); | |
365 | } | |
8a146fbe | 366 | |
e3a2e878 | 367 | gpiochip_unlock_as_irq(chip, event->pin); |
86252329 | 368 | gpiochip_free_own_desc(event->desc); |
4b01a14b MW |
369 | list_del(&event->node); |
370 | kfree(event); | |
70b53411 | 371 | } |
70b53411 | 372 | } |
2b528fff | 373 | EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts); |
70b53411 | 374 | |
f028d524 RW |
375 | int acpi_dev_add_driver_gpios(struct acpi_device *adev, |
376 | const struct acpi_gpio_mapping *gpios) | |
377 | { | |
378 | if (adev && gpios) { | |
379 | adev->driver_gpios = gpios; | |
380 | return 0; | |
381 | } | |
382 | return -EINVAL; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios); | |
385 | ||
85c73d50 AS |
386 | static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res) |
387 | { | |
388 | acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev)); | |
389 | } | |
390 | ||
391 | int devm_acpi_dev_add_driver_gpios(struct device *dev, | |
392 | const struct acpi_gpio_mapping *gpios) | |
393 | { | |
394 | void *res; | |
395 | int ret; | |
396 | ||
397 | res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL); | |
398 | if (!res) | |
399 | return -ENOMEM; | |
400 | ||
401 | ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios); | |
402 | if (ret) { | |
403 | devres_free(res); | |
404 | return ret; | |
405 | } | |
406 | devres_add(dev, res); | |
407 | return 0; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios); | |
410 | ||
411 | void devm_acpi_dev_remove_driver_gpios(struct device *dev) | |
412 | { | |
413 | WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL)); | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios); | |
416 | ||
f028d524 RW |
417 | static bool acpi_get_driver_gpio_data(struct acpi_device *adev, |
418 | const char *name, int index, | |
977d5ad3 | 419 | struct fwnode_reference_args *args, |
ce0929d2 | 420 | unsigned int *quirks) |
f028d524 RW |
421 | { |
422 | const struct acpi_gpio_mapping *gm; | |
423 | ||
424 | if (!adev->driver_gpios) | |
425 | return false; | |
426 | ||
427 | for (gm = adev->driver_gpios; gm->name; gm++) | |
428 | if (!strcmp(name, gm->name) && gm->data && index < gm->size) { | |
429 | const struct acpi_gpio_params *par = gm->data + index; | |
430 | ||
977d5ad3 | 431 | args->fwnode = acpi_fwnode_handle(adev); |
f028d524 RW |
432 | args->args[0] = par->crs_entry_index; |
433 | args->args[1] = par->line_index; | |
434 | args->args[2] = par->active_low; | |
435 | args->nargs = 3; | |
ce0929d2 AS |
436 | |
437 | *quirks = gm->quirks; | |
f028d524 RW |
438 | return true; |
439 | } | |
440 | ||
441 | return false; | |
442 | } | |
443 | ||
2eca25af AS |
444 | static enum gpiod_flags |
445 | acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) | |
446 | { | |
2eca25af AS |
447 | switch (agpio->io_restriction) { |
448 | case ACPI_IO_RESTRICT_INPUT: | |
449 | return GPIOD_IN; | |
450 | case ACPI_IO_RESTRICT_OUTPUT: | |
451 | /* | |
452 | * ACPI GPIO resources don't contain an initial value for the | |
453 | * GPIO. Therefore we deduce that value from the pull field | |
454 | * instead. If the pin is pulled up we assume default to be | |
24a49543 AS |
455 | * high, if it is pulled down we assume default to be low, |
456 | * otherwise we leave pin untouched. | |
2eca25af | 457 | */ |
24a49543 AS |
458 | switch (agpio->pin_config) { |
459 | case ACPI_PIN_CONFIG_PULLUP: | |
460 | return GPIOD_OUT_HIGH; | |
461 | case ACPI_PIN_CONFIG_PULLDOWN: | |
462 | return GPIOD_OUT_LOW; | |
463 | default: | |
464 | break; | |
465 | } | |
2eca25af | 466 | default: |
24a49543 | 467 | break; |
2eca25af | 468 | } |
24a49543 AS |
469 | |
470 | /* | |
471 | * Assume that the BIOS has configured the direction and pull | |
472 | * accordingly. | |
473 | */ | |
474 | return GPIOD_ASIS; | |
2eca25af AS |
475 | } |
476 | ||
5c34b6c1 AS |
477 | static int |
478 | __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) | |
a31f5c3a | 479 | { |
72893f0c HG |
480 | const enum gpiod_flags mask = |
481 | GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT | | |
482 | GPIOD_FLAGS_BIT_DIR_VAL; | |
a31f5c3a AS |
483 | int ret = 0; |
484 | ||
485 | /* | |
486 | * Check if the BIOS has IoRestriction with explicitly set direction | |
487 | * and update @flags accordingly. Otherwise use whatever caller asked | |
488 | * for. | |
489 | */ | |
490 | if (update & GPIOD_FLAGS_BIT_DIR_SET) { | |
491 | enum gpiod_flags diff = *flags ^ update; | |
492 | ||
493 | /* | |
494 | * Check if caller supplied incompatible GPIO initialization | |
495 | * flags. | |
496 | * | |
497 | * Return %-EINVAL to notify that firmware has different | |
498 | * settings and we are going to use them. | |
499 | */ | |
500 | if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) || | |
501 | ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL))) | |
502 | ret = -EINVAL; | |
72893f0c | 503 | *flags = (*flags & ~mask) | (update & mask); |
a31f5c3a AS |
504 | } |
505 | return ret; | |
506 | } | |
507 | ||
5c34b6c1 AS |
508 | int |
509 | acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) | |
510 | { | |
511 | struct device *dev = &info->adev->dev; | |
1b2ca32a | 512 | enum gpiod_flags old = *flags; |
5c34b6c1 AS |
513 | int ret; |
514 | ||
1b2ca32a AS |
515 | ret = __acpi_gpio_update_gpiod_flags(&old, info->flags); |
516 | if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) { | |
517 | if (ret) | |
518 | dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n"); | |
519 | } else { | |
520 | if (ret) | |
521 | dev_dbg(dev, "Override GPIO initialization flags\n"); | |
522 | *flags = old; | |
523 | } | |
5c34b6c1 AS |
524 | |
525 | return ret; | |
526 | } | |
527 | ||
606be344 AS |
528 | int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, |
529 | struct acpi_gpio_info *info) | |
530 | { | |
2d3b6db1 AS |
531 | switch (info->pin_config) { |
532 | case ACPI_PIN_CONFIG_PULLUP: | |
533 | *lookupflags |= GPIO_PULL_UP; | |
534 | break; | |
535 | case ACPI_PIN_CONFIG_PULLDOWN: | |
536 | *lookupflags |= GPIO_PULL_DOWN; | |
537 | break; | |
538 | default: | |
539 | break; | |
540 | } | |
541 | ||
606be344 AS |
542 | if (info->polarity == GPIO_ACTIVE_LOW) |
543 | *lookupflags |= GPIO_ACTIVE_LOW; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
12028d2d MW |
548 | struct acpi_gpio_lookup { |
549 | struct acpi_gpio_info info; | |
550 | int index; | |
0d9a693c | 551 | int pin_index; |
d079524a | 552 | bool active_low; |
936e15dd | 553 | struct gpio_desc *desc; |
12028d2d MW |
554 | int n; |
555 | }; | |
556 | ||
031ba28a | 557 | static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) |
12028d2d MW |
558 | { |
559 | struct acpi_gpio_lookup *lookup = data; | |
560 | ||
561 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
562 | return 1; | |
563 | ||
4d1f7a6e | 564 | if (!lookup->desc) { |
12028d2d | 565 | const struct acpi_resource_gpio *agpio = &ares->data.gpio; |
4d1f7a6e AS |
566 | bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; |
567 | int pin_index; | |
0d9a693c | 568 | |
4d1f7a6e AS |
569 | if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint) |
570 | lookup->index++; | |
571 | ||
572 | if (lookup->n++ != lookup->index) | |
573 | return 1; | |
574 | ||
575 | pin_index = lookup->pin_index; | |
0d9a693c MW |
576 | if (pin_index >= agpio->pin_table_length) |
577 | return 1; | |
12028d2d | 578 | |
936e15dd | 579 | lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, |
0d9a693c | 580 | agpio->pin_table[pin_index]); |
2d3b6db1 | 581 | lookup->info.pin_config = agpio->pin_config; |
4d1f7a6e | 582 | lookup->info.gpioint = gpioint; |
0d9a693c MW |
583 | |
584 | /* | |
e567c35f AS |
585 | * Polarity and triggering are only specified for GpioInt |
586 | * resource. | |
52044723 CR |
587 | * Note: we expect here: |
588 | * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW | |
589 | * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH | |
0d9a693c | 590 | */ |
52044723 | 591 | if (lookup->info.gpioint) { |
a31f5c3a | 592 | lookup->info.flags = GPIOD_IN; |
52044723 CR |
593 | lookup->info.polarity = agpio->polarity; |
594 | lookup->info.triggering = agpio->triggering; | |
a31f5c3a AS |
595 | } else { |
596 | lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio); | |
f67a6c11 | 597 | lookup->info.polarity = lookup->active_low; |
52044723 | 598 | } |
12028d2d MW |
599 | } |
600 | ||
601 | return 1; | |
602 | } | |
603 | ||
d079524a RW |
604 | static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup, |
605 | struct acpi_gpio_info *info) | |
606 | { | |
5870cff4 | 607 | struct acpi_device *adev = lookup->info.adev; |
d079524a RW |
608 | struct list_head res_list; |
609 | int ret; | |
610 | ||
611 | INIT_LIST_HEAD(&res_list); | |
612 | ||
5870cff4 | 613 | ret = acpi_dev_get_resources(adev, &res_list, |
031ba28a | 614 | acpi_populate_gpio_lookup, |
d079524a RW |
615 | lookup); |
616 | if (ret < 0) | |
617 | return ret; | |
618 | ||
619 | acpi_dev_free_resource_list(&res_list); | |
620 | ||
621 | if (!lookup->desc) | |
622 | return -ENOENT; | |
623 | ||
f67a6c11 | 624 | if (info) |
d079524a | 625 | *info = lookup->info; |
d079524a RW |
626 | return 0; |
627 | } | |
628 | ||
504a3374 | 629 | static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, |
d079524a RW |
630 | const char *propname, int index, |
631 | struct acpi_gpio_lookup *lookup) | |
632 | { | |
977d5ad3 | 633 | struct fwnode_reference_args args; |
ce0929d2 | 634 | unsigned int quirks = 0; |
d079524a RW |
635 | int ret; |
636 | ||
637 | memset(&args, 0, sizeof(args)); | |
6f7194a1 MW |
638 | ret = __acpi_node_get_property_reference(fwnode, propname, index, 3, |
639 | &args); | |
504a3374 RW |
640 | if (ret) { |
641 | struct acpi_device *adev = to_acpi_device_node(fwnode); | |
d079524a | 642 | |
504a3374 RW |
643 | if (!adev) |
644 | return ret; | |
645 | ||
ce0929d2 AS |
646 | if (!acpi_get_driver_gpio_data(adev, propname, index, &args, |
647 | &quirks)) | |
504a3374 RW |
648 | return ret; |
649 | } | |
d079524a RW |
650 | /* |
651 | * The property was found and resolved, so need to lookup the GPIO based | |
652 | * on returned args. | |
653 | */ | |
977d5ad3 SA |
654 | if (!to_acpi_device_node(args.fwnode)) |
655 | return -EINVAL; | |
6f7194a1 MW |
656 | if (args.nargs != 3) |
657 | return -EPROTO; | |
658 | ||
659 | lookup->index = args.args[0]; | |
660 | lookup->pin_index = args.args[1]; | |
661 | lookup->active_low = !!args.args[2]; | |
662 | ||
977d5ad3 | 663 | lookup->info.adev = to_acpi_device_node(args.fwnode); |
ce0929d2 | 664 | lookup->info.quirks = quirks; |
977d5ad3 | 665 | |
d079524a RW |
666 | return 0; |
667 | } | |
668 | ||
12028d2d | 669 | /** |
936e15dd | 670 | * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources |
0d9a693c MW |
671 | * @adev: pointer to a ACPI device to get GPIO from |
672 | * @propname: Property name of the GPIO (optional) | |
12028d2d MW |
673 | * @index: index of GpioIo/GpioInt resource (starting from %0) |
674 | * @info: info pointer to fill in (optional) | |
675 | * | |
0d9a693c | 676 | * Function goes through ACPI resources for @adev and based on @index looks |
936e15dd | 677 | * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, |
12028d2d MW |
678 | * and returns it. @index matches GpioIo/GpioInt resources only so if there |
679 | * are total %3 GPIO resources, the index goes from %0 to %2. | |
680 | * | |
0d9a693c MW |
681 | * If @propname is specified the GPIO is looked using device property. In |
682 | * that case @index is used to select the GPIO entry in the property value | |
683 | * (in case of multiple). | |
684 | * | |
85edcd01 | 685 | * If the GPIO cannot be translated or there is an error, an ERR_PTR is |
12028d2d MW |
686 | * returned. |
687 | * | |
688 | * Note: if the GPIO resource has multiple entries in the pin list, this | |
689 | * function only returns the first. | |
690 | */ | |
031ba28a | 691 | static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
0d9a693c | 692 | const char *propname, int index, |
936e15dd | 693 | struct acpi_gpio_info *info) |
12028d2d MW |
694 | { |
695 | struct acpi_gpio_lookup lookup; | |
12028d2d MW |
696 | int ret; |
697 | ||
0d9a693c | 698 | if (!adev) |
936e15dd | 699 | return ERR_PTR(-ENODEV); |
12028d2d MW |
700 | |
701 | memset(&lookup, 0, sizeof(lookup)); | |
702 | lookup.index = index; | |
12028d2d | 703 | |
0d9a693c | 704 | if (propname) { |
0d9a693c MW |
705 | dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname); |
706 | ||
504a3374 RW |
707 | ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev), |
708 | propname, index, &lookup); | |
d079524a RW |
709 | if (ret) |
710 | return ERR_PTR(ret); | |
0d9a693c | 711 | |
d079524a | 712 | dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n", |
5870cff4 | 713 | dev_name(&lookup.info.adev->dev), lookup.index, |
d079524a | 714 | lookup.pin_index, lookup.active_low); |
0d9a693c MW |
715 | } else { |
716 | dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index); | |
5870cff4 | 717 | lookup.info.adev = adev; |
0d9a693c MW |
718 | } |
719 | ||
d079524a RW |
720 | ret = acpi_gpio_resource_lookup(&lookup, info); |
721 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 722 | } |
664e3e5a | 723 | |
031ba28a LW |
724 | struct gpio_desc *acpi_find_gpio(struct device *dev, |
725 | const char *con_id, | |
726 | unsigned int idx, | |
a31f5c3a | 727 | enum gpiod_flags *dflags, |
fed7026a | 728 | unsigned long *lookupflags) |
031ba28a LW |
729 | { |
730 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
731 | struct acpi_gpio_info info; | |
732 | struct gpio_desc *desc; | |
733 | char propname[32]; | |
734 | int i; | |
735 | ||
736 | /* Try first from _DSD */ | |
737 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 738 | if (con_id) { |
031ba28a LW |
739 | snprintf(propname, sizeof(propname), "%s-%s", |
740 | con_id, gpio_suffixes[i]); | |
741 | } else { | |
742 | snprintf(propname, sizeof(propname), "%s", | |
743 | gpio_suffixes[i]); | |
744 | } | |
745 | ||
746 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
693bdaa1 | 747 | if (!IS_ERR(desc)) |
031ba28a | 748 | break; |
693bdaa1 DT |
749 | if (PTR_ERR(desc) == -EPROBE_DEFER) |
750 | return ERR_CAST(desc); | |
031ba28a LW |
751 | } |
752 | ||
753 | /* Then from plain _CRS GPIOs */ | |
754 | if (IS_ERR(desc)) { | |
755 | if (!acpi_can_fallback_to_crs(adev, con_id)) | |
756 | return ERR_PTR(-ENOENT); | |
757 | ||
758 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); | |
759 | if (IS_ERR(desc)) | |
760 | return desc; | |
fe06b56c | 761 | } |
031ba28a | 762 | |
fe06b56c | 763 | if (info.gpioint && |
a31f5c3a | 764 | (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) { |
fe06b56c AS |
765 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); |
766 | return ERR_PTR(-ENOENT); | |
031ba28a LW |
767 | } |
768 | ||
5c34b6c1 | 769 | acpi_gpio_update_gpiod_flags(dflags, &info); |
606be344 | 770 | acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info); |
031ba28a LW |
771 | return desc; |
772 | } | |
773 | ||
504a3374 RW |
774 | /** |
775 | * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources | |
776 | * @fwnode: pointer to an ACPI firmware node to get the GPIO information from | |
777 | * @propname: Property name of the GPIO | |
778 | * @index: index of GpioIo/GpioInt resource (starting from %0) | |
779 | * @info: info pointer to fill in (optional) | |
780 | * | |
85edcd01 AS |
781 | * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. |
782 | * Otherwise (i.e. it is a data-only non-device object), use the property-based | |
504a3374 RW |
783 | * GPIO lookup to get to the GPIO resource with the relevant information and use |
784 | * that to obtain the GPIO descriptor to return. | |
85edcd01 AS |
785 | * |
786 | * If the GPIO cannot be translated or there is an error an ERR_PTR is | |
787 | * returned. | |
504a3374 RW |
788 | */ |
789 | struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, | |
790 | const char *propname, int index, | |
791 | struct acpi_gpio_info *info) | |
792 | { | |
793 | struct acpi_gpio_lookup lookup; | |
794 | struct acpi_device *adev; | |
795 | int ret; | |
12028d2d | 796 | |
504a3374 RW |
797 | adev = to_acpi_device_node(fwnode); |
798 | if (adev) | |
799 | return acpi_get_gpiod_by_index(adev, propname, index, info); | |
12028d2d | 800 | |
504a3374 RW |
801 | if (!is_acpi_data_node(fwnode)) |
802 | return ERR_PTR(-ENODEV); | |
803 | ||
804 | if (!propname) | |
805 | return ERR_PTR(-EINVAL); | |
806 | ||
807 | memset(&lookup, 0, sizeof(lookup)); | |
808 | lookup.index = index; | |
809 | ||
810 | ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); | |
811 | if (ret) | |
812 | return ERR_PTR(ret); | |
12028d2d | 813 | |
504a3374 RW |
814 | ret = acpi_gpio_resource_lookup(&lookup, info); |
815 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 816 | } |
664e3e5a | 817 | |
c884fbd4 MW |
818 | /** |
819 | * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number | |
820 | * @adev: pointer to a ACPI device to get IRQ from | |
821 | * @index: index of GpioInt resource (starting from %0) | |
822 | * | |
823 | * If the device has one or more GpioInt resources, this function can be | |
824 | * used to translate from the GPIO offset in the resource to the Linux IRQ | |
825 | * number. | |
826 | * | |
a31f5c3a AS |
827 | * The function is idempotent, though each time it runs it will configure GPIO |
828 | * pin direction according to the flags in GpioInt resource. | |
829 | * | |
db05c7ef | 830 | * Return: Linux IRQ number (> %0) on success, negative errno on failure. |
c884fbd4 MW |
831 | */ |
832 | int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) | |
833 | { | |
834 | int idx, i; | |
52044723 | 835 | unsigned int irq_flags; |
a31f5c3a | 836 | int ret; |
c884fbd4 MW |
837 | |
838 | for (i = 0, idx = 0; idx <= index; i++) { | |
839 | struct acpi_gpio_info info; | |
840 | struct gpio_desc *desc; | |
841 | ||
842 | desc = acpi_get_gpiod_by_index(adev, NULL, i, &info); | |
6798d727 HG |
843 | |
844 | /* Ignore -EPROBE_DEFER, it only matters if idx matches */ | |
845 | if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) | |
846 | return PTR_ERR(desc); | |
847 | ||
52044723 | 848 | if (info.gpioint && idx++ == index) { |
2d6c06f5 | 849 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
a31f5c3a | 850 | char label[32]; |
6798d727 | 851 | int irq; |
52044723 | 852 | |
6798d727 HG |
853 | if (IS_ERR(desc)) |
854 | return PTR_ERR(desc); | |
52044723 | 855 | |
6798d727 | 856 | irq = gpiod_to_irq(desc); |
52044723 CR |
857 | if (irq < 0) |
858 | return irq; | |
859 | ||
a31f5c3a | 860 | snprintf(label, sizeof(label), "GpioInt() %d", index); |
2d6c06f5 | 861 | ret = gpiod_configure_flags(desc, label, lflags, info.flags); |
a31f5c3a AS |
862 | if (ret < 0) |
863 | return ret; | |
864 | ||
52044723 CR |
865 | irq_flags = acpi_dev_get_irq_type(info.triggering, |
866 | info.polarity); | |
867 | ||
868 | /* Set type if specified and different than the current one */ | |
869 | if (irq_flags != IRQ_TYPE_NONE && | |
870 | irq_flags != irq_get_trigger_type(irq)) | |
871 | irq_set_irq_type(irq, irq_flags); | |
872 | ||
873 | return irq; | |
874 | } | |
875 | ||
c884fbd4 | 876 | } |
6798d727 | 877 | return -ENOENT; |
c884fbd4 MW |
878 | } |
879 | EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get); | |
880 | ||
473ed7be MW |
881 | static acpi_status |
882 | acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, | |
883 | u32 bits, u64 *value, void *handler_context, | |
884 | void *region_context) | |
885 | { | |
886 | struct acpi_gpio_chip *achip = region_context; | |
887 | struct gpio_chip *chip = achip->chip; | |
888 | struct acpi_resource_gpio *agpio; | |
889 | struct acpi_resource *ares; | |
c15d821d | 890 | int pin_index = (int)address; |
473ed7be | 891 | acpi_status status; |
c15d821d | 892 | int length; |
473ed7be MW |
893 | int i; |
894 | ||
895 | status = acpi_buffer_to_resource(achip->conn_info.connection, | |
896 | achip->conn_info.length, &ares); | |
897 | if (ACPI_FAILURE(status)) | |
898 | return status; | |
899 | ||
900 | if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { | |
901 | ACPI_FREE(ares); | |
902 | return AE_BAD_PARAMETER; | |
903 | } | |
904 | ||
905 | agpio = &ares->data.gpio; | |
473ed7be MW |
906 | |
907 | if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && | |
908 | function == ACPI_WRITE)) { | |
909 | ACPI_FREE(ares); | |
910 | return AE_BAD_PARAMETER; | |
911 | } | |
912 | ||
c15d821d SP |
913 | length = min(agpio->pin_table_length, (u16)(pin_index + bits)); |
914 | for (i = pin_index; i < length; ++i) { | |
a4811622 | 915 | int pin = agpio->pin_table[i]; |
473ed7be MW |
916 | struct acpi_gpio_connection *conn; |
917 | struct gpio_desc *desc; | |
918 | bool found; | |
919 | ||
473ed7be MW |
920 | mutex_lock(&achip->conn_lock); |
921 | ||
922 | found = false; | |
923 | list_for_each_entry(conn, &achip->conns, node) { | |
e46cf32c | 924 | if (conn->pin == pin) { |
473ed7be | 925 | found = true; |
e46cf32c | 926 | desc = conn->desc; |
473ed7be MW |
927 | break; |
928 | } | |
929 | } | |
c103a10f MW |
930 | |
931 | /* | |
932 | * The same GPIO can be shared between operation region and | |
933 | * event but only if the access here is ACPI_READ. In that | |
934 | * case we "borrow" the event GPIO instead. | |
935 | */ | |
c163f90c | 936 | if (!found && agpio->shareable == ACPI_SHARED && |
c103a10f MW |
937 | function == ACPI_READ) { |
938 | struct acpi_gpio_event *event; | |
939 | ||
940 | list_for_each_entry(event, &achip->events, node) { | |
941 | if (event->pin == pin) { | |
942 | desc = event->desc; | |
943 | found = true; | |
944 | break; | |
945 | } | |
946 | } | |
947 | } | |
948 | ||
473ed7be | 949 | if (!found) { |
2eca25af AS |
950 | enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio); |
951 | const char *label = "ACPI:OpRegion"; | |
2eca25af | 952 | |
21abf103 | 953 | desc = gpiochip_request_own_desc(chip, pin, label, |
5923ea6c | 954 | GPIO_ACTIVE_HIGH, |
21abf103 | 955 | flags); |
e46cf32c | 956 | if (IS_ERR(desc)) { |
473ed7be MW |
957 | status = AE_ERROR; |
958 | mutex_unlock(&achip->conn_lock); | |
959 | goto out; | |
960 | } | |
961 | ||
473ed7be MW |
962 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
963 | if (!conn) { | |
964 | status = AE_NO_MEMORY; | |
965 | gpiochip_free_own_desc(desc); | |
966 | mutex_unlock(&achip->conn_lock); | |
967 | goto out; | |
968 | } | |
969 | ||
e46cf32c | 970 | conn->pin = pin; |
473ed7be MW |
971 | conn->desc = desc; |
972 | list_add_tail(&conn->node, &achip->conns); | |
973 | } | |
974 | ||
975 | mutex_unlock(&achip->conn_lock); | |
976 | ||
977 | if (function == ACPI_WRITE) | |
dc62b56a AL |
978 | gpiod_set_raw_value_cansleep(desc, |
979 | !!((1 << i) & *value)); | |
473ed7be | 980 | else |
dc62b56a | 981 | *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; |
473ed7be MW |
982 | } |
983 | ||
984 | out: | |
985 | ACPI_FREE(ares); | |
986 | return status; | |
987 | } | |
988 | ||
989 | static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) | |
990 | { | |
991 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 992 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
993 | acpi_status status; |
994 | ||
995 | INIT_LIST_HEAD(&achip->conns); | |
996 | mutex_init(&achip->conn_lock); | |
997 | status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
998 | acpi_gpio_adr_space_handler, | |
999 | NULL, achip); | |
1000 | if (ACPI_FAILURE(status)) | |
58383c78 LW |
1001 | dev_err(chip->parent, |
1002 | "Failed to install GPIO OpRegion handler\n"); | |
473ed7be MW |
1003 | } |
1004 | ||
1005 | static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) | |
1006 | { | |
1007 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 1008 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
1009 | struct acpi_gpio_connection *conn, *tmp; |
1010 | acpi_status status; | |
1011 | ||
1012 | status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
1013 | acpi_gpio_adr_space_handler); | |
1014 | if (ACPI_FAILURE(status)) { | |
58383c78 LW |
1015 | dev_err(chip->parent, |
1016 | "Failed to remove GPIO OpRegion handler\n"); | |
473ed7be MW |
1017 | return; |
1018 | } | |
1019 | ||
1020 | list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { | |
1021 | gpiochip_free_own_desc(conn->desc); | |
1022 | list_del(&conn->node); | |
1023 | kfree(conn); | |
1024 | } | |
1025 | } | |
1026 | ||
fed7026a AS |
1027 | static struct gpio_desc * |
1028 | acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip, | |
1029 | struct fwnode_handle *fwnode, | |
1030 | const char **name, | |
1031 | unsigned long *lflags, | |
80c8d927 | 1032 | enum gpiod_flags *dflags) |
c80f1ba7 MW |
1033 | { |
1034 | struct gpio_chip *chip = achip->chip; | |
1035 | struct gpio_desc *desc; | |
1036 | u32 gpios[2]; | |
1037 | int ret; | |
1038 | ||
2d6c06f5 | 1039 | *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
c82064f2 AB |
1040 | *dflags = 0; |
1041 | *name = NULL; | |
1042 | ||
c80f1ba7 MW |
1043 | ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, |
1044 | ARRAY_SIZE(gpios)); | |
1045 | if (ret < 0) | |
1046 | return ERR_PTR(ret); | |
1047 | ||
03c4749d | 1048 | desc = gpiochip_get_desc(chip, gpios[0]); |
c80f1ba7 MW |
1049 | if (IS_ERR(desc)) |
1050 | return desc; | |
1051 | ||
c80f1ba7 MW |
1052 | if (gpios[1]) |
1053 | *lflags |= GPIO_ACTIVE_LOW; | |
1054 | ||
1055 | if (fwnode_property_present(fwnode, "input")) | |
1056 | *dflags |= GPIOD_IN; | |
1057 | else if (fwnode_property_present(fwnode, "output-low")) | |
1058 | *dflags |= GPIOD_OUT_LOW; | |
1059 | else if (fwnode_property_present(fwnode, "output-high")) | |
1060 | *dflags |= GPIOD_OUT_HIGH; | |
1061 | else | |
1062 | return ERR_PTR(-EINVAL); | |
1063 | ||
1064 | fwnode_property_read_string(fwnode, "line-name", name); | |
1065 | ||
1066 | return desc; | |
1067 | } | |
1068 | ||
1069 | static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip) | |
1070 | { | |
1071 | struct gpio_chip *chip = achip->chip; | |
1072 | struct fwnode_handle *fwnode; | |
1073 | ||
1074 | device_for_each_child_node(chip->parent, fwnode) { | |
fed7026a | 1075 | unsigned long lflags; |
80c8d927 | 1076 | enum gpiod_flags dflags; |
c80f1ba7 MW |
1077 | struct gpio_desc *desc; |
1078 | const char *name; | |
1079 | int ret; | |
1080 | ||
1081 | if (!fwnode_property_present(fwnode, "gpio-hog")) | |
1082 | continue; | |
1083 | ||
1084 | desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name, | |
1085 | &lflags, &dflags); | |
1086 | if (IS_ERR(desc)) | |
1087 | continue; | |
1088 | ||
1089 | ret = gpiod_hog(desc, name, lflags, dflags); | |
1090 | if (ret) { | |
1091 | dev_err(chip->parent, "Failed to hog GPIO\n"); | |
1b6998c9 | 1092 | fwnode_handle_put(fwnode); |
c80f1ba7 MW |
1093 | return; |
1094 | } | |
1095 | } | |
1096 | } | |
1097 | ||
664e3e5a MW |
1098 | void acpi_gpiochip_add(struct gpio_chip *chip) |
1099 | { | |
aa92b6f6 MW |
1100 | struct acpi_gpio_chip *acpi_gpio; |
1101 | acpi_handle handle; | |
1102 | acpi_status status; | |
1103 | ||
58383c78 | 1104 | if (!chip || !chip->parent) |
e9595f84 MW |
1105 | return; |
1106 | ||
58383c78 | 1107 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1108 | if (!handle) |
1109 | return; | |
1110 | ||
1111 | acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); | |
1112 | if (!acpi_gpio) { | |
58383c78 | 1113 | dev_err(chip->parent, |
aa92b6f6 MW |
1114 | "Failed to allocate memory for ACPI GPIO chip\n"); |
1115 | return; | |
1116 | } | |
1117 | ||
1118 | acpi_gpio->chip = chip; | |
c103a10f | 1119 | INIT_LIST_HEAD(&acpi_gpio->events); |
78d3a92e | 1120 | INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry); |
aa92b6f6 MW |
1121 | |
1122 | status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); | |
1123 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1124 | dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n"); |
aa92b6f6 MW |
1125 | kfree(acpi_gpio); |
1126 | return; | |
1127 | } | |
1128 | ||
4035cc15 | 1129 | if (!chip->names) |
82270335 | 1130 | devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent)); |
4035cc15 | 1131 | |
473ed7be | 1132 | acpi_gpiochip_request_regions(acpi_gpio); |
c80f1ba7 | 1133 | acpi_gpiochip_scan_gpios(acpi_gpio); |
3f86a635 | 1134 | acpi_walk_dep_device_list(handle); |
664e3e5a MW |
1135 | } |
1136 | ||
1137 | void acpi_gpiochip_remove(struct gpio_chip *chip) | |
1138 | { | |
aa92b6f6 MW |
1139 | struct acpi_gpio_chip *acpi_gpio; |
1140 | acpi_handle handle; | |
1141 | acpi_status status; | |
1142 | ||
58383c78 | 1143 | if (!chip || !chip->parent) |
e9595f84 MW |
1144 | return; |
1145 | ||
58383c78 | 1146 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1147 | if (!handle) |
1148 | return; | |
1149 | ||
1150 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
1151 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1152 | dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n"); |
aa92b6f6 MW |
1153 | return; |
1154 | } | |
1155 | ||
473ed7be | 1156 | acpi_gpiochip_free_regions(acpi_gpio); |
aa92b6f6 MW |
1157 | |
1158 | acpi_detach_data(handle, acpi_gpio_chip_dh); | |
1159 | kfree(acpi_gpio); | |
664e3e5a | 1160 | } |
66858527 | 1161 | |
6f7194a1 | 1162 | static int acpi_gpio_package_count(const union acpi_object *obj) |
66858527 RI |
1163 | { |
1164 | const union acpi_object *element = obj->package.elements; | |
1165 | const union acpi_object *end = element + obj->package.count; | |
1166 | unsigned int count = 0; | |
1167 | ||
1168 | while (element < end) { | |
6f7194a1 MW |
1169 | switch (element->type) { |
1170 | case ACPI_TYPE_LOCAL_REFERENCE: | |
1171 | element += 3; | |
1172 | /* Fallthrough */ | |
1173 | case ACPI_TYPE_INTEGER: | |
1174 | element++; | |
66858527 | 1175 | count++; |
6f7194a1 | 1176 | break; |
66858527 | 1177 | |
6f7194a1 MW |
1178 | default: |
1179 | return -EPROTO; | |
1180 | } | |
66858527 | 1181 | } |
6f7194a1 | 1182 | |
66858527 RI |
1183 | return count; |
1184 | } | |
1185 | ||
1186 | static int acpi_find_gpio_count(struct acpi_resource *ares, void *data) | |
1187 | { | |
1188 | unsigned int *count = data; | |
1189 | ||
1190 | if (ares->type == ACPI_RESOURCE_TYPE_GPIO) | |
1191 | *count += ares->data.gpio.pin_table_length; | |
1192 | ||
1193 | return 1; | |
1194 | } | |
1195 | ||
1196 | /** | |
85edcd01 AS |
1197 | * acpi_gpio_count - count the GPIOs associated with a device / function |
1198 | * @dev: GPIO consumer, can be %NULL for system-global GPIOs | |
66858527 | 1199 | * @con_id: function within the GPIO consumer |
85edcd01 AS |
1200 | * |
1201 | * Return: | |
1202 | * The number of GPIOs associated with a device / function or %-ENOENT, | |
1203 | * if no GPIO has been assigned to the requested function. | |
66858527 RI |
1204 | */ |
1205 | int acpi_gpio_count(struct device *dev, const char *con_id) | |
1206 | { | |
1207 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1208 | const union acpi_object *obj; | |
1209 | const struct acpi_gpio_mapping *gm; | |
1210 | int count = -ENOENT; | |
1211 | int ret; | |
1212 | char propname[32]; | |
1213 | unsigned int i; | |
1214 | ||
1215 | /* Try first from _DSD */ | |
1216 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 1217 | if (con_id) |
66858527 RI |
1218 | snprintf(propname, sizeof(propname), "%s-%s", |
1219 | con_id, gpio_suffixes[i]); | |
1220 | else | |
1221 | snprintf(propname, sizeof(propname), "%s", | |
1222 | gpio_suffixes[i]); | |
1223 | ||
1224 | ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY, | |
1225 | &obj); | |
1226 | if (ret == 0) { | |
1227 | if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) | |
1228 | count = 1; | |
1229 | else if (obj->type == ACPI_TYPE_PACKAGE) | |
1230 | count = acpi_gpio_package_count(obj); | |
1231 | } else if (adev->driver_gpios) { | |
1232 | for (gm = adev->driver_gpios; gm->name; gm++) | |
1233 | if (strcmp(propname, gm->name) == 0) { | |
1234 | count = gm->size; | |
1235 | break; | |
1236 | } | |
1237 | } | |
4ed55016 | 1238 | if (count > 0) |
66858527 RI |
1239 | break; |
1240 | } | |
1241 | ||
1242 | /* Then from plain _CRS GPIOs */ | |
1243 | if (count < 0) { | |
1244 | struct list_head resource_list; | |
1245 | unsigned int crs_count = 0; | |
1246 | ||
6fe9da42 AS |
1247 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
1248 | return count; | |
1249 | ||
66858527 RI |
1250 | INIT_LIST_HEAD(&resource_list); |
1251 | acpi_dev_get_resources(adev, &resource_list, | |
1252 | acpi_find_gpio_count, &crs_count); | |
1253 | acpi_dev_free_resource_list(&resource_list); | |
1254 | if (crs_count > 0) | |
1255 | count = crs_count; | |
1256 | } | |
4ed55016 | 1257 | return count ? count : -ENOENT; |
66858527 | 1258 | } |
10cf4899 | 1259 | |
10cf4899 DT |
1260 | bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) |
1261 | { | |
10cf4899 | 1262 | /* Never allow fallback if the device has properties */ |
5f5e4890 | 1263 | if (acpi_dev_has_props(adev) || adev->driver_gpios) |
10cf4899 DT |
1264 | return false; |
1265 | ||
f10e4bf6 | 1266 | return con_id == NULL; |
10cf4899 | 1267 | } |
ca876c74 | 1268 | |
e59f5e08 HG |
1269 | /* Run deferred acpi_gpiochip_request_irqs() */ |
1270 | static int acpi_gpio_handle_deferred_request_irqs(void) | |
ca876c74 | 1271 | { |
78d3a92e HG |
1272 | struct acpi_gpio_chip *acpi_gpio, *tmp; |
1273 | ||
1274 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); | |
1275 | list_for_each_entry_safe(acpi_gpio, tmp, | |
1276 | &acpi_gpio_deferred_req_irqs_list, | |
e59f5e08 HG |
1277 | deferred_req_irqs_list_entry) |
1278 | acpi_gpiochip_request_irqs(acpi_gpio); | |
78d3a92e HG |
1279 | |
1280 | acpi_gpio_deferred_req_irqs_done = true; | |
1281 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
ca876c74 BT |
1282 | |
1283 | return 0; | |
1284 | } | |
1285 | /* We must use _sync so that this runs after the first deferred_probe run */ | |
e59f5e08 | 1286 | late_initcall_sync(acpi_gpio_handle_deferred_request_irqs); |