Commit | Line | Data |
---|---|---|
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 | ||
61f7f7c8 | 10 | #include <linux/dmi.h> |
e29482e8 | 11 | #include <linux/errno.h> |
936e15dd | 12 | #include <linux/gpio/consumer.h> |
5ccff852 | 13 | #include <linux/gpio/driver.h> |
031ba28a | 14 | #include <linux/gpio/machine.h> |
e29482e8 | 15 | #include <linux/export.h> |
e29482e8 | 16 | #include <linux/acpi.h> |
0d1c28a4 | 17 | #include <linux/interrupt.h> |
473ed7be | 18 | #include <linux/mutex.h> |
354567e6 | 19 | #include <linux/pinctrl/pinctrl.h> |
e29482e8 | 20 | |
5ccff852 | 21 | #include "gpiolib.h" |
77cb907a | 22 | #include "gpiolib-acpi.h" |
5ccff852 | 23 | |
61f7f7c8 HG |
24 | static int run_edge_events_on_boot = -1; |
25 | module_param(run_edge_events_on_boot, int, 0444); | |
26 | MODULE_PARM_DESC(run_edge_events_on_boot, | |
27 | "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto"); | |
28 | ||
e59f5e08 HG |
29 | /** |
30 | * struct acpi_gpio_event - ACPI GPIO event handler data | |
31 | * | |
32 | * @node: list-entry of the events list of the struct acpi_gpio_chip | |
33 | * @handle: handle of ACPI method to execute when the IRQ triggers | |
85edcd01 AS |
34 | * @handler: handler function to pass to request_irq() when requesting the IRQ |
35 | * @pin: GPIO pin number on the struct gpio_chip | |
36 | * @irq: Linux IRQ number for the event, for request_irq() / free_irq() | |
37 | * @irqflags: flags to pass to request_irq() when requesting the IRQ | |
e59f5e08 | 38 | * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source |
85edcd01 AS |
39 | * @irq_requested:True if request_irq() has been done |
40 | * @desc: struct gpio_desc for the GPIO pin for this event | |
e59f5e08 | 41 | */ |
4b01a14b | 42 | struct acpi_gpio_event { |
7fc7acb9 | 43 | struct list_head node; |
4b01a14b | 44 | acpi_handle handle; |
e59f5e08 | 45 | irq_handler_t handler; |
7fc7acb9 RW |
46 | unsigned int pin; |
47 | unsigned int irq; | |
e59f5e08 HG |
48 | unsigned long irqflags; |
49 | bool irq_is_wake; | |
50 | bool irq_requested; | |
e46cf32c | 51 | struct gpio_desc *desc; |
7fc7acb9 RW |
52 | }; |
53 | ||
473ed7be MW |
54 | struct acpi_gpio_connection { |
55 | struct list_head node; | |
e46cf32c | 56 | unsigned int pin; |
473ed7be MW |
57 | struct gpio_desc *desc; |
58 | }; | |
59 | ||
aa92b6f6 | 60 | struct acpi_gpio_chip { |
473ed7be MW |
61 | /* |
62 | * ACPICA requires that the first field of the context parameter | |
63 | * passed to acpi_install_address_space_handler() is large enough | |
64 | * to hold struct acpi_connection_info. | |
65 | */ | |
66 | struct acpi_connection_info conn_info; | |
67 | struct list_head conns; | |
68 | struct mutex conn_lock; | |
aa92b6f6 | 69 | struct gpio_chip *chip; |
4b01a14b | 70 | struct list_head events; |
78d3a92e | 71 | struct list_head deferred_req_irqs_list_entry; |
aa92b6f6 MW |
72 | }; |
73 | ||
78d3a92e | 74 | /* |
85edcd01 | 75 | * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init |
e59f5e08 | 76 | * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a |
85edcd01 AS |
77 | * late_initcall_sync() handler, so that other builtin drivers can register their |
78 | * OpRegions before the event handlers can run. This list contains GPIO chips | |
e59f5e08 | 79 | * for which the acpi_gpiochip_request_irqs() call has been deferred. |
78d3a92e HG |
80 | */ |
81 | static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock); | |
82 | static LIST_HEAD(acpi_gpio_deferred_req_irqs_list); | |
83 | static bool acpi_gpio_deferred_req_irqs_done; | |
ca876c74 | 84 | |
e29482e8 MN |
85 | static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) |
86 | { | |
58383c78 | 87 | if (!gc->parent) |
e29482e8 MN |
88 | return false; |
89 | ||
58383c78 | 90 | return ACPI_HANDLE(gc->parent) == data; |
e29482e8 MN |
91 | } |
92 | ||
93 | /** | |
936e15dd | 94 | * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API |
e29482e8 MN |
95 | * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") |
96 | * @pin: ACPI GPIO pin number (0-based, controller-relative) | |
97 | * | |
f35bbf61 MW |
98 | * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR |
99 | * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO | |
85edcd01 | 100 | * controller does not have GPIO chip registered at the moment. This is to |
f35bbf61 | 101 | * support probe deferral. |
e29482e8 | 102 | */ |
936e15dd | 103 | static struct gpio_desc *acpi_get_gpiod(char *path, int pin) |
e29482e8 MN |
104 | { |
105 | struct gpio_chip *chip; | |
106 | acpi_handle handle; | |
107 | acpi_status status; | |
108 | ||
109 | status = acpi_get_handle(NULL, path, &handle); | |
110 | if (ACPI_FAILURE(status)) | |
936e15dd | 111 | return ERR_PTR(-ENODEV); |
e29482e8 MN |
112 | |
113 | chip = gpiochip_find(handle, acpi_gpiochip_find); | |
114 | if (!chip) | |
f35bbf61 | 115 | return ERR_PTR(-EPROBE_DEFER); |
e29482e8 | 116 | |
03c4749d | 117 | return gpiochip_get_desc(chip, pin); |
e29482e8 | 118 | } |
0d1c28a4 | 119 | |
0d1c28a4 MN |
120 | static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) |
121 | { | |
6072b9dc | 122 | struct acpi_gpio_event *event = data; |
0d1c28a4 | 123 | |
6072b9dc | 124 | acpi_evaluate_object(event->handle, NULL, NULL, NULL); |
0d1c28a4 MN |
125 | |
126 | return IRQ_HANDLED; | |
127 | } | |
128 | ||
7fc7acb9 RW |
129 | static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) |
130 | { | |
4b01a14b | 131 | struct acpi_gpio_event *event = data; |
7fc7acb9 | 132 | |
4b01a14b | 133 | acpi_execute_simple_method(event->handle, NULL, event->pin); |
7fc7acb9 RW |
134 | |
135 | return IRQ_HANDLED; | |
136 | } | |
137 | ||
aa92b6f6 | 138 | static void acpi_gpio_chip_dh(acpi_handle handle, void *data) |
7fc7acb9 RW |
139 | { |
140 | /* The address of this function is used as a key. */ | |
141 | } | |
142 | ||
25e3ef89 AS |
143 | bool acpi_gpio_get_irq_resource(struct acpi_resource *ares, |
144 | struct acpi_resource_gpio **agpio) | |
145 | { | |
146 | struct acpi_resource_gpio *gpio; | |
147 | ||
148 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
149 | return false; | |
150 | ||
151 | gpio = &ares->data.gpio; | |
152 | if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) | |
153 | return false; | |
154 | ||
155 | *agpio = gpio; | |
156 | return true; | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource); | |
159 | ||
e59f5e08 HG |
160 | static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio, |
161 | struct acpi_gpio_event *event) | |
162 | { | |
163 | int ret, value; | |
164 | ||
165 | ret = request_threaded_irq(event->irq, NULL, event->handler, | |
166 | event->irqflags, "ACPI:Event", event); | |
167 | if (ret) { | |
168 | dev_err(acpi_gpio->chip->parent, | |
169 | "Failed to setup interrupt handler for %d\n", | |
170 | event->irq); | |
171 | return; | |
172 | } | |
173 | ||
174 | if (event->irq_is_wake) | |
175 | enable_irq_wake(event->irq); | |
176 | ||
177 | event->irq_requested = true; | |
178 | ||
179 | /* Make sure we trigger the initial state of edge-triggered IRQs */ | |
61f7f7c8 HG |
180 | if (run_edge_events_on_boot && |
181 | (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) { | |
182 | value = gpiod_get_raw_value_cansleep(event->desc); | |
183 | if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) || | |
184 | ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0)) | |
185 | event->handler(event->irq, event); | |
186 | } | |
e59f5e08 HG |
187 | } |
188 | ||
189 | static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio) | |
190 | { | |
191 | struct acpi_gpio_event *event; | |
192 | ||
193 | list_for_each_entry(event, &acpi_gpio->events, node) | |
194 | acpi_gpiochip_request_irq(acpi_gpio, event); | |
195 | } | |
196 | ||
197 | static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares, | |
198 | void *context) | |
0d1c28a4 | 199 | { |
6072b9dc | 200 | struct acpi_gpio_chip *acpi_gpio = context; |
aa92b6f6 | 201 | struct gpio_chip *chip = acpi_gpio->chip; |
6072b9dc | 202 | struct acpi_resource_gpio *agpio; |
7fc7acb9 | 203 | acpi_handle handle, evt_handle; |
6072b9dc MW |
204 | struct acpi_gpio_event *event; |
205 | irq_handler_t handler = NULL; | |
206 | struct gpio_desc *desc; | |
e59f5e08 | 207 | int ret, pin, irq; |
0d1c28a4 | 208 | |
25e3ef89 | 209 | if (!acpi_gpio_get_irq_resource(ares, &agpio)) |
6072b9dc | 210 | return AE_OK; |
0d1c28a4 | 211 | |
58383c78 | 212 | handle = ACPI_HANDLE(chip->parent); |
6072b9dc MW |
213 | pin = agpio->pin_table[0]; |
214 | ||
215 | if (pin <= 255) { | |
216 | char ev_name[5]; | |
e40a3ae1 | 217 | sprintf(ev_name, "_%c%02hhX", |
6072b9dc MW |
218 | agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', |
219 | pin); | |
220 | if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) | |
221 | handler = acpi_gpio_irq_handler; | |
222 | } | |
223 | if (!handler) { | |
224 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) | |
225 | handler = acpi_gpio_irq_handler_evt; | |
226 | } | |
227 | if (!handler) | |
c06632ea | 228 | return AE_OK; |
0d1c28a4 | 229 | |
5923ea6c LW |
230 | desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", |
231 | GPIO_ACTIVE_HIGH, GPIOD_IN); | |
6072b9dc | 232 | if (IS_ERR(desc)) { |
58383c78 | 233 | dev_err(chip->parent, "Failed to request GPIO\n"); |
6072b9dc MW |
234 | return AE_ERROR; |
235 | } | |
0d1c28a4 | 236 | |
e3a2e878 | 237 | ret = gpiochip_lock_as_irq(chip, pin); |
6072b9dc | 238 | if (ret) { |
58383c78 | 239 | dev_err(chip->parent, "Failed to lock GPIO as interrupt\n"); |
6072b9dc MW |
240 | goto fail_free_desc; |
241 | } | |
0d1c28a4 | 242 | |
6072b9dc MW |
243 | irq = gpiod_to_irq(desc); |
244 | if (irq < 0) { | |
58383c78 | 245 | dev_err(chip->parent, "Failed to translate GPIO to IRQ\n"); |
6072b9dc MW |
246 | goto fail_unlock_irq; |
247 | } | |
7fc7acb9 | 248 | |
e59f5e08 HG |
249 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
250 | if (!event) | |
251 | goto fail_unlock_irq; | |
252 | ||
253 | event->irqflags = IRQF_ONESHOT; | |
6072b9dc MW |
254 | if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { |
255 | if (agpio->polarity == ACPI_ACTIVE_HIGH) | |
e59f5e08 | 256 | event->irqflags |= IRQF_TRIGGER_HIGH; |
6072b9dc | 257 | else |
e59f5e08 | 258 | event->irqflags |= IRQF_TRIGGER_LOW; |
6072b9dc MW |
259 | } else { |
260 | switch (agpio->polarity) { | |
261 | case ACPI_ACTIVE_HIGH: | |
e59f5e08 | 262 | event->irqflags |= IRQF_TRIGGER_RISING; |
6072b9dc MW |
263 | break; |
264 | case ACPI_ACTIVE_LOW: | |
e59f5e08 | 265 | event->irqflags |= IRQF_TRIGGER_FALLING; |
6072b9dc MW |
266 | break; |
267 | default: | |
e59f5e08 HG |
268 | event->irqflags |= IRQF_TRIGGER_RISING | |
269 | IRQF_TRIGGER_FALLING; | |
6072b9dc | 270 | break; |
7fc7acb9 | 271 | } |
6072b9dc | 272 | } |
aa92b6f6 | 273 | |
6072b9dc | 274 | event->handle = evt_handle; |
e59f5e08 | 275 | event->handler = handler; |
6072b9dc | 276 | event->irq = irq; |
e59f5e08 | 277 | event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE; |
6072b9dc | 278 | event->pin = pin; |
e46cf32c | 279 | event->desc = desc; |
7fc7acb9 | 280 | |
6072b9dc | 281 | list_add_tail(&event->node, &acpi_gpio->events); |
ca876c74 | 282 | |
6072b9dc MW |
283 | return AE_OK; |
284 | ||
6072b9dc | 285 | fail_unlock_irq: |
e3a2e878 | 286 | gpiochip_unlock_as_irq(chip, pin); |
6072b9dc MW |
287 | fail_free_desc: |
288 | gpiochip_free_own_desc(desc); | |
289 | ||
290 | return AE_ERROR; | |
0d1c28a4 | 291 | } |
7fc7acb9 | 292 | |
70b53411 | 293 | /** |
6072b9dc | 294 | * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events |
afa82fab | 295 | * @chip: GPIO chip |
70b53411 | 296 | * |
6072b9dc MW |
297 | * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are |
298 | * handled by ACPI event methods which need to be called from the GPIO | |
85edcd01 AS |
299 | * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which |
300 | * GPIO pins have ACPI event methods and assigns interrupt handlers that calls | |
301 | * the ACPI event methods for those pins. | |
6072b9dc | 302 | */ |
afa82fab | 303 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) |
6072b9dc | 304 | { |
afa82fab MW |
305 | struct acpi_gpio_chip *acpi_gpio; |
306 | acpi_handle handle; | |
307 | acpi_status status; | |
78d3a92e | 308 | bool defer; |
afa82fab | 309 | |
58383c78 | 310 | if (!chip->parent || !chip->to_irq) |
afa82fab | 311 | return; |
6072b9dc | 312 | |
58383c78 | 313 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
314 | if (!handle) |
315 | return; | |
316 | ||
317 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
318 | if (ACPI_FAILURE(status)) | |
6072b9dc MW |
319 | return; |
320 | ||
e59f5e08 HG |
321 | acpi_walk_resources(handle, "_AEI", |
322 | acpi_gpiochip_alloc_event, acpi_gpio); | |
323 | ||
78d3a92e HG |
324 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); |
325 | defer = !acpi_gpio_deferred_req_irqs_done; | |
326 | if (defer) | |
327 | list_add(&acpi_gpio->deferred_req_irqs_list_entry, | |
328 | &acpi_gpio_deferred_req_irqs_list); | |
329 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
330 | ||
331 | if (defer) | |
332 | return; | |
333 | ||
e59f5e08 | 334 | acpi_gpiochip_request_irqs(acpi_gpio); |
6072b9dc | 335 | } |
2b528fff | 336 | EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts); |
6072b9dc MW |
337 | |
338 | /** | |
339 | * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. | |
afa82fab | 340 | * @chip: GPIO chip |
70b53411 | 341 | * |
6072b9dc MW |
342 | * Free interrupts associated with GPIO ACPI event method for the given |
343 | * GPIO chip. | |
70b53411 | 344 | */ |
afa82fab | 345 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) |
70b53411 | 346 | { |
afa82fab | 347 | struct acpi_gpio_chip *acpi_gpio; |
4b01a14b | 348 | struct acpi_gpio_event *event, *ep; |
afa82fab MW |
349 | acpi_handle handle; |
350 | acpi_status status; | |
351 | ||
58383c78 | 352 | if (!chip->parent || !chip->to_irq) |
afa82fab | 353 | return; |
70b53411 | 354 | |
58383c78 | 355 | handle = ACPI_HANDLE(chip->parent); |
afa82fab MW |
356 | if (!handle) |
357 | return; | |
358 | ||
359 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
360 | if (ACPI_FAILURE(status)) | |
70b53411 MW |
361 | return; |
362 | ||
78d3a92e HG |
363 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); |
364 | if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry)) | |
365 | list_del_init(&acpi_gpio->deferred_req_irqs_list_entry); | |
366 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
367 | ||
4b01a14b | 368 | list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { |
e59f5e08 HG |
369 | if (event->irq_requested) { |
370 | if (event->irq_is_wake) | |
371 | disable_irq_wake(event->irq); | |
372 | ||
373 | free_irq(event->irq, event); | |
374 | } | |
8a146fbe | 375 | |
e3a2e878 | 376 | gpiochip_unlock_as_irq(chip, event->pin); |
86252329 | 377 | gpiochip_free_own_desc(event->desc); |
4b01a14b MW |
378 | list_del(&event->node); |
379 | kfree(event); | |
70b53411 | 380 | } |
70b53411 | 381 | } |
2b528fff | 382 | EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts); |
70b53411 | 383 | |
f028d524 RW |
384 | int acpi_dev_add_driver_gpios(struct acpi_device *adev, |
385 | const struct acpi_gpio_mapping *gpios) | |
386 | { | |
387 | if (adev && gpios) { | |
388 | adev->driver_gpios = gpios; | |
389 | return 0; | |
390 | } | |
391 | return -EINVAL; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios); | |
394 | ||
2838bf94 AS |
395 | void acpi_dev_remove_driver_gpios(struct acpi_device *adev) |
396 | { | |
397 | if (adev) | |
398 | adev->driver_gpios = NULL; | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios); | |
401 | ||
85c73d50 AS |
402 | static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res) |
403 | { | |
404 | acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev)); | |
405 | } | |
406 | ||
407 | int devm_acpi_dev_add_driver_gpios(struct device *dev, | |
408 | const struct acpi_gpio_mapping *gpios) | |
409 | { | |
410 | void *res; | |
411 | int ret; | |
412 | ||
413 | res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL); | |
414 | if (!res) | |
415 | return -ENOMEM; | |
416 | ||
417 | ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios); | |
418 | if (ret) { | |
419 | devres_free(res); | |
420 | return ret; | |
421 | } | |
422 | devres_add(dev, res); | |
423 | return 0; | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios); | |
426 | ||
427 | void devm_acpi_dev_remove_driver_gpios(struct device *dev) | |
428 | { | |
429 | WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL)); | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios); | |
432 | ||
f028d524 RW |
433 | static bool acpi_get_driver_gpio_data(struct acpi_device *adev, |
434 | const char *name, int index, | |
977d5ad3 | 435 | struct fwnode_reference_args *args, |
ce0929d2 | 436 | unsigned int *quirks) |
f028d524 RW |
437 | { |
438 | const struct acpi_gpio_mapping *gm; | |
439 | ||
440 | if (!adev->driver_gpios) | |
441 | return false; | |
442 | ||
443 | for (gm = adev->driver_gpios; gm->name; gm++) | |
444 | if (!strcmp(name, gm->name) && gm->data && index < gm->size) { | |
445 | const struct acpi_gpio_params *par = gm->data + index; | |
446 | ||
977d5ad3 | 447 | args->fwnode = acpi_fwnode_handle(adev); |
f028d524 RW |
448 | args->args[0] = par->crs_entry_index; |
449 | args->args[1] = par->line_index; | |
450 | args->args[2] = par->active_low; | |
451 | args->nargs = 3; | |
ce0929d2 AS |
452 | |
453 | *quirks = gm->quirks; | |
f028d524 RW |
454 | return true; |
455 | } | |
456 | ||
457 | return false; | |
458 | } | |
459 | ||
2eca25af AS |
460 | static enum gpiod_flags |
461 | acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) | |
462 | { | |
2eca25af AS |
463 | switch (agpio->io_restriction) { |
464 | case ACPI_IO_RESTRICT_INPUT: | |
465 | return GPIOD_IN; | |
466 | case ACPI_IO_RESTRICT_OUTPUT: | |
467 | /* | |
468 | * ACPI GPIO resources don't contain an initial value for the | |
469 | * GPIO. Therefore we deduce that value from the pull field | |
470 | * instead. If the pin is pulled up we assume default to be | |
24a49543 AS |
471 | * high, if it is pulled down we assume default to be low, |
472 | * otherwise we leave pin untouched. | |
2eca25af | 473 | */ |
24a49543 AS |
474 | switch (agpio->pin_config) { |
475 | case ACPI_PIN_CONFIG_PULLUP: | |
476 | return GPIOD_OUT_HIGH; | |
477 | case ACPI_PIN_CONFIG_PULLDOWN: | |
478 | return GPIOD_OUT_LOW; | |
479 | default: | |
480 | break; | |
481 | } | |
2eca25af | 482 | default: |
24a49543 | 483 | break; |
2eca25af | 484 | } |
24a49543 AS |
485 | |
486 | /* | |
487 | * Assume that the BIOS has configured the direction and pull | |
488 | * accordingly. | |
489 | */ | |
490 | return GPIOD_ASIS; | |
2eca25af AS |
491 | } |
492 | ||
5c34b6c1 AS |
493 | static int |
494 | __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) | |
a31f5c3a | 495 | { |
72893f0c HG |
496 | const enum gpiod_flags mask = |
497 | GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT | | |
498 | GPIOD_FLAGS_BIT_DIR_VAL; | |
a31f5c3a AS |
499 | int ret = 0; |
500 | ||
501 | /* | |
502 | * Check if the BIOS has IoRestriction with explicitly set direction | |
503 | * and update @flags accordingly. Otherwise use whatever caller asked | |
504 | * for. | |
505 | */ | |
506 | if (update & GPIOD_FLAGS_BIT_DIR_SET) { | |
507 | enum gpiod_flags diff = *flags ^ update; | |
508 | ||
509 | /* | |
510 | * Check if caller supplied incompatible GPIO initialization | |
511 | * flags. | |
512 | * | |
513 | * Return %-EINVAL to notify that firmware has different | |
514 | * settings and we are going to use them. | |
515 | */ | |
516 | if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) || | |
517 | ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL))) | |
518 | ret = -EINVAL; | |
72893f0c | 519 | *flags = (*flags & ~mask) | (update & mask); |
a31f5c3a AS |
520 | } |
521 | return ret; | |
522 | } | |
523 | ||
5c34b6c1 AS |
524 | int |
525 | acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) | |
526 | { | |
527 | struct device *dev = &info->adev->dev; | |
1b2ca32a | 528 | enum gpiod_flags old = *flags; |
5c34b6c1 AS |
529 | int ret; |
530 | ||
1b2ca32a AS |
531 | ret = __acpi_gpio_update_gpiod_flags(&old, info->flags); |
532 | if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) { | |
533 | if (ret) | |
534 | dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n"); | |
535 | } else { | |
536 | if (ret) | |
537 | dev_dbg(dev, "Override GPIO initialization flags\n"); | |
538 | *flags = old; | |
539 | } | |
5c34b6c1 AS |
540 | |
541 | return ret; | |
542 | } | |
543 | ||
606be344 AS |
544 | int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, |
545 | struct acpi_gpio_info *info) | |
546 | { | |
2d3b6db1 AS |
547 | switch (info->pin_config) { |
548 | case ACPI_PIN_CONFIG_PULLUP: | |
549 | *lookupflags |= GPIO_PULL_UP; | |
550 | break; | |
551 | case ACPI_PIN_CONFIG_PULLDOWN: | |
552 | *lookupflags |= GPIO_PULL_DOWN; | |
553 | break; | |
554 | default: | |
555 | break; | |
556 | } | |
557 | ||
606be344 AS |
558 | if (info->polarity == GPIO_ACTIVE_LOW) |
559 | *lookupflags |= GPIO_ACTIVE_LOW; | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
12028d2d MW |
564 | struct acpi_gpio_lookup { |
565 | struct acpi_gpio_info info; | |
566 | int index; | |
0d9a693c | 567 | int pin_index; |
d079524a | 568 | bool active_low; |
936e15dd | 569 | struct gpio_desc *desc; |
12028d2d MW |
570 | int n; |
571 | }; | |
572 | ||
031ba28a | 573 | static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) |
12028d2d MW |
574 | { |
575 | struct acpi_gpio_lookup *lookup = data; | |
576 | ||
577 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
578 | return 1; | |
579 | ||
4d1f7a6e | 580 | if (!lookup->desc) { |
12028d2d | 581 | const struct acpi_resource_gpio *agpio = &ares->data.gpio; |
4d1f7a6e AS |
582 | bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; |
583 | int pin_index; | |
0d9a693c | 584 | |
4d1f7a6e AS |
585 | if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint) |
586 | lookup->index++; | |
587 | ||
588 | if (lookup->n++ != lookup->index) | |
589 | return 1; | |
590 | ||
591 | pin_index = lookup->pin_index; | |
0d9a693c MW |
592 | if (pin_index >= agpio->pin_table_length) |
593 | return 1; | |
12028d2d | 594 | |
936e15dd | 595 | lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, |
0d9a693c | 596 | agpio->pin_table[pin_index]); |
2d3b6db1 | 597 | lookup->info.pin_config = agpio->pin_config; |
4d1f7a6e | 598 | lookup->info.gpioint = gpioint; |
0d9a693c MW |
599 | |
600 | /* | |
e567c35f AS |
601 | * Polarity and triggering are only specified for GpioInt |
602 | * resource. | |
52044723 CR |
603 | * Note: we expect here: |
604 | * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW | |
605 | * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH | |
0d9a693c | 606 | */ |
52044723 | 607 | if (lookup->info.gpioint) { |
a31f5c3a | 608 | lookup->info.flags = GPIOD_IN; |
52044723 CR |
609 | lookup->info.polarity = agpio->polarity; |
610 | lookup->info.triggering = agpio->triggering; | |
a31f5c3a AS |
611 | } else { |
612 | lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio); | |
f67a6c11 | 613 | lookup->info.polarity = lookup->active_low; |
52044723 | 614 | } |
12028d2d MW |
615 | } |
616 | ||
617 | return 1; | |
618 | } | |
619 | ||
d079524a RW |
620 | static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup, |
621 | struct acpi_gpio_info *info) | |
622 | { | |
5870cff4 | 623 | struct acpi_device *adev = lookup->info.adev; |
d079524a RW |
624 | struct list_head res_list; |
625 | int ret; | |
626 | ||
627 | INIT_LIST_HEAD(&res_list); | |
628 | ||
5870cff4 | 629 | ret = acpi_dev_get_resources(adev, &res_list, |
031ba28a | 630 | acpi_populate_gpio_lookup, |
d079524a RW |
631 | lookup); |
632 | if (ret < 0) | |
633 | return ret; | |
634 | ||
635 | acpi_dev_free_resource_list(&res_list); | |
636 | ||
637 | if (!lookup->desc) | |
638 | return -ENOENT; | |
639 | ||
f67a6c11 | 640 | if (info) |
d079524a | 641 | *info = lookup->info; |
d079524a RW |
642 | return 0; |
643 | } | |
644 | ||
504a3374 | 645 | static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, |
d079524a RW |
646 | const char *propname, int index, |
647 | struct acpi_gpio_lookup *lookup) | |
648 | { | |
977d5ad3 | 649 | struct fwnode_reference_args args; |
ce0929d2 | 650 | unsigned int quirks = 0; |
d079524a RW |
651 | int ret; |
652 | ||
653 | memset(&args, 0, sizeof(args)); | |
6f7194a1 MW |
654 | ret = __acpi_node_get_property_reference(fwnode, propname, index, 3, |
655 | &args); | |
504a3374 RW |
656 | if (ret) { |
657 | struct acpi_device *adev = to_acpi_device_node(fwnode); | |
d079524a | 658 | |
504a3374 RW |
659 | if (!adev) |
660 | return ret; | |
661 | ||
ce0929d2 AS |
662 | if (!acpi_get_driver_gpio_data(adev, propname, index, &args, |
663 | &quirks)) | |
504a3374 RW |
664 | return ret; |
665 | } | |
d079524a RW |
666 | /* |
667 | * The property was found and resolved, so need to lookup the GPIO based | |
668 | * on returned args. | |
669 | */ | |
977d5ad3 SA |
670 | if (!to_acpi_device_node(args.fwnode)) |
671 | return -EINVAL; | |
6f7194a1 MW |
672 | if (args.nargs != 3) |
673 | return -EPROTO; | |
674 | ||
675 | lookup->index = args.args[0]; | |
676 | lookup->pin_index = args.args[1]; | |
677 | lookup->active_low = !!args.args[2]; | |
678 | ||
977d5ad3 | 679 | lookup->info.adev = to_acpi_device_node(args.fwnode); |
ce0929d2 | 680 | lookup->info.quirks = quirks; |
977d5ad3 | 681 | |
d079524a RW |
682 | return 0; |
683 | } | |
684 | ||
12028d2d | 685 | /** |
936e15dd | 686 | * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources |
0d9a693c MW |
687 | * @adev: pointer to a ACPI device to get GPIO from |
688 | * @propname: Property name of the GPIO (optional) | |
12028d2d MW |
689 | * @index: index of GpioIo/GpioInt resource (starting from %0) |
690 | * @info: info pointer to fill in (optional) | |
691 | * | |
0d9a693c | 692 | * Function goes through ACPI resources for @adev and based on @index looks |
936e15dd | 693 | * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, |
12028d2d MW |
694 | * and returns it. @index matches GpioIo/GpioInt resources only so if there |
695 | * are total %3 GPIO resources, the index goes from %0 to %2. | |
696 | * | |
0d9a693c MW |
697 | * If @propname is specified the GPIO is looked using device property. In |
698 | * that case @index is used to select the GPIO entry in the property value | |
699 | * (in case of multiple). | |
700 | * | |
85edcd01 | 701 | * If the GPIO cannot be translated or there is an error, an ERR_PTR is |
12028d2d MW |
702 | * returned. |
703 | * | |
704 | * Note: if the GPIO resource has multiple entries in the pin list, this | |
705 | * function only returns the first. | |
706 | */ | |
031ba28a | 707 | static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
0d9a693c | 708 | const char *propname, int index, |
936e15dd | 709 | struct acpi_gpio_info *info) |
12028d2d MW |
710 | { |
711 | struct acpi_gpio_lookup lookup; | |
12028d2d MW |
712 | int ret; |
713 | ||
0d9a693c | 714 | if (!adev) |
936e15dd | 715 | return ERR_PTR(-ENODEV); |
12028d2d MW |
716 | |
717 | memset(&lookup, 0, sizeof(lookup)); | |
718 | lookup.index = index; | |
12028d2d | 719 | |
0d9a693c | 720 | if (propname) { |
0d9a693c MW |
721 | dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname); |
722 | ||
504a3374 RW |
723 | ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev), |
724 | propname, index, &lookup); | |
d079524a RW |
725 | if (ret) |
726 | return ERR_PTR(ret); | |
0d9a693c | 727 | |
d079524a | 728 | dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n", |
5870cff4 | 729 | dev_name(&lookup.info.adev->dev), lookup.index, |
d079524a | 730 | lookup.pin_index, lookup.active_low); |
0d9a693c MW |
731 | } else { |
732 | dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index); | |
5870cff4 | 733 | lookup.info.adev = adev; |
0d9a693c MW |
734 | } |
735 | ||
d079524a RW |
736 | ret = acpi_gpio_resource_lookup(&lookup, info); |
737 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 738 | } |
664e3e5a | 739 | |
4f78d91c DT |
740 | static bool acpi_can_fallback_to_crs(struct acpi_device *adev, |
741 | const char *con_id) | |
742 | { | |
743 | /* Never allow fallback if the device has properties */ | |
744 | if (acpi_dev_has_props(adev) || adev->driver_gpios) | |
745 | return false; | |
746 | ||
747 | return con_id == NULL; | |
748 | } | |
749 | ||
031ba28a LW |
750 | struct gpio_desc *acpi_find_gpio(struct device *dev, |
751 | const char *con_id, | |
752 | unsigned int idx, | |
a31f5c3a | 753 | enum gpiod_flags *dflags, |
fed7026a | 754 | unsigned long *lookupflags) |
031ba28a LW |
755 | { |
756 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
757 | struct acpi_gpio_info info; | |
758 | struct gpio_desc *desc; | |
759 | char propname[32]; | |
760 | int i; | |
761 | ||
762 | /* Try first from _DSD */ | |
763 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 764 | if (con_id) { |
031ba28a LW |
765 | snprintf(propname, sizeof(propname), "%s-%s", |
766 | con_id, gpio_suffixes[i]); | |
767 | } else { | |
768 | snprintf(propname, sizeof(propname), "%s", | |
769 | gpio_suffixes[i]); | |
770 | } | |
771 | ||
772 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
693bdaa1 | 773 | if (!IS_ERR(desc)) |
031ba28a | 774 | break; |
693bdaa1 DT |
775 | if (PTR_ERR(desc) == -EPROBE_DEFER) |
776 | return ERR_CAST(desc); | |
031ba28a LW |
777 | } |
778 | ||
779 | /* Then from plain _CRS GPIOs */ | |
780 | if (IS_ERR(desc)) { | |
781 | if (!acpi_can_fallback_to_crs(adev, con_id)) | |
782 | return ERR_PTR(-ENOENT); | |
783 | ||
784 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); | |
785 | if (IS_ERR(desc)) | |
786 | return desc; | |
fe06b56c | 787 | } |
031ba28a | 788 | |
fe06b56c | 789 | if (info.gpioint && |
a31f5c3a | 790 | (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) { |
fe06b56c AS |
791 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); |
792 | return ERR_PTR(-ENOENT); | |
031ba28a LW |
793 | } |
794 | ||
5c34b6c1 | 795 | acpi_gpio_update_gpiod_flags(dflags, &info); |
606be344 | 796 | acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info); |
031ba28a LW |
797 | return desc; |
798 | } | |
799 | ||
504a3374 RW |
800 | /** |
801 | * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources | |
802 | * @fwnode: pointer to an ACPI firmware node to get the GPIO information from | |
803 | * @propname: Property name of the GPIO | |
804 | * @index: index of GpioIo/GpioInt resource (starting from %0) | |
805 | * @info: info pointer to fill in (optional) | |
806 | * | |
85edcd01 AS |
807 | * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. |
808 | * Otherwise (i.e. it is a data-only non-device object), use the property-based | |
504a3374 RW |
809 | * GPIO lookup to get to the GPIO resource with the relevant information and use |
810 | * that to obtain the GPIO descriptor to return. | |
85edcd01 AS |
811 | * |
812 | * If the GPIO cannot be translated or there is an error an ERR_PTR is | |
813 | * returned. | |
504a3374 RW |
814 | */ |
815 | struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, | |
816 | const char *propname, int index, | |
817 | struct acpi_gpio_info *info) | |
818 | { | |
819 | struct acpi_gpio_lookup lookup; | |
820 | struct acpi_device *adev; | |
821 | int ret; | |
12028d2d | 822 | |
504a3374 RW |
823 | adev = to_acpi_device_node(fwnode); |
824 | if (adev) | |
825 | return acpi_get_gpiod_by_index(adev, propname, index, info); | |
12028d2d | 826 | |
504a3374 RW |
827 | if (!is_acpi_data_node(fwnode)) |
828 | return ERR_PTR(-ENODEV); | |
829 | ||
830 | if (!propname) | |
831 | return ERR_PTR(-EINVAL); | |
832 | ||
833 | memset(&lookup, 0, sizeof(lookup)); | |
834 | lookup.index = index; | |
835 | ||
836 | ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); | |
837 | if (ret) | |
838 | return ERR_PTR(ret); | |
12028d2d | 839 | |
504a3374 RW |
840 | ret = acpi_gpio_resource_lookup(&lookup, info); |
841 | return ret ? ERR_PTR(ret) : lookup.desc; | |
12028d2d | 842 | } |
664e3e5a | 843 | |
c884fbd4 MW |
844 | /** |
845 | * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number | |
846 | * @adev: pointer to a ACPI device to get IRQ from | |
847 | * @index: index of GpioInt resource (starting from %0) | |
848 | * | |
849 | * If the device has one or more GpioInt resources, this function can be | |
850 | * used to translate from the GPIO offset in the resource to the Linux IRQ | |
851 | * number. | |
852 | * | |
a31f5c3a AS |
853 | * The function is idempotent, though each time it runs it will configure GPIO |
854 | * pin direction according to the flags in GpioInt resource. | |
855 | * | |
db05c7ef | 856 | * Return: Linux IRQ number (> %0) on success, negative errno on failure. |
c884fbd4 MW |
857 | */ |
858 | int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) | |
859 | { | |
860 | int idx, i; | |
52044723 | 861 | unsigned int irq_flags; |
a31f5c3a | 862 | int ret; |
c884fbd4 MW |
863 | |
864 | for (i = 0, idx = 0; idx <= index; i++) { | |
865 | struct acpi_gpio_info info; | |
866 | struct gpio_desc *desc; | |
867 | ||
868 | desc = acpi_get_gpiod_by_index(adev, NULL, i, &info); | |
6798d727 HG |
869 | |
870 | /* Ignore -EPROBE_DEFER, it only matters if idx matches */ | |
871 | if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) | |
872 | return PTR_ERR(desc); | |
873 | ||
52044723 | 874 | if (info.gpioint && idx++ == index) { |
2d6c06f5 | 875 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
a31f5c3a | 876 | char label[32]; |
6798d727 | 877 | int irq; |
52044723 | 878 | |
6798d727 HG |
879 | if (IS_ERR(desc)) |
880 | return PTR_ERR(desc); | |
52044723 | 881 | |
6798d727 | 882 | irq = gpiod_to_irq(desc); |
52044723 CR |
883 | if (irq < 0) |
884 | return irq; | |
885 | ||
a31f5c3a | 886 | snprintf(label, sizeof(label), "GpioInt() %d", index); |
2d6c06f5 | 887 | ret = gpiod_configure_flags(desc, label, lflags, info.flags); |
a31f5c3a AS |
888 | if (ret < 0) |
889 | return ret; | |
890 | ||
52044723 CR |
891 | irq_flags = acpi_dev_get_irq_type(info.triggering, |
892 | info.polarity); | |
893 | ||
894 | /* Set type if specified and different than the current one */ | |
895 | if (irq_flags != IRQ_TYPE_NONE && | |
896 | irq_flags != irq_get_trigger_type(irq)) | |
897 | irq_set_irq_type(irq, irq_flags); | |
898 | ||
899 | return irq; | |
900 | } | |
901 | ||
c884fbd4 | 902 | } |
6798d727 | 903 | return -ENOENT; |
c884fbd4 MW |
904 | } |
905 | EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get); | |
906 | ||
473ed7be MW |
907 | static acpi_status |
908 | acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, | |
909 | u32 bits, u64 *value, void *handler_context, | |
910 | void *region_context) | |
911 | { | |
912 | struct acpi_gpio_chip *achip = region_context; | |
913 | struct gpio_chip *chip = achip->chip; | |
914 | struct acpi_resource_gpio *agpio; | |
915 | struct acpi_resource *ares; | |
c15d821d | 916 | int pin_index = (int)address; |
473ed7be | 917 | acpi_status status; |
c15d821d | 918 | int length; |
473ed7be MW |
919 | int i; |
920 | ||
921 | status = acpi_buffer_to_resource(achip->conn_info.connection, | |
922 | achip->conn_info.length, &ares); | |
923 | if (ACPI_FAILURE(status)) | |
924 | return status; | |
925 | ||
926 | if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { | |
927 | ACPI_FREE(ares); | |
928 | return AE_BAD_PARAMETER; | |
929 | } | |
930 | ||
931 | agpio = &ares->data.gpio; | |
473ed7be MW |
932 | |
933 | if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && | |
934 | function == ACPI_WRITE)) { | |
935 | ACPI_FREE(ares); | |
936 | return AE_BAD_PARAMETER; | |
937 | } | |
938 | ||
c15d821d SP |
939 | length = min(agpio->pin_table_length, (u16)(pin_index + bits)); |
940 | for (i = pin_index; i < length; ++i) { | |
a4811622 | 941 | int pin = agpio->pin_table[i]; |
473ed7be MW |
942 | struct acpi_gpio_connection *conn; |
943 | struct gpio_desc *desc; | |
944 | bool found; | |
945 | ||
473ed7be MW |
946 | mutex_lock(&achip->conn_lock); |
947 | ||
948 | found = false; | |
949 | list_for_each_entry(conn, &achip->conns, node) { | |
e46cf32c | 950 | if (conn->pin == pin) { |
473ed7be | 951 | found = true; |
e46cf32c | 952 | desc = conn->desc; |
473ed7be MW |
953 | break; |
954 | } | |
955 | } | |
c103a10f MW |
956 | |
957 | /* | |
958 | * The same GPIO can be shared between operation region and | |
959 | * event but only if the access here is ACPI_READ. In that | |
960 | * case we "borrow" the event GPIO instead. | |
961 | */ | |
c163f90c | 962 | if (!found && agpio->shareable == ACPI_SHARED && |
c103a10f MW |
963 | function == ACPI_READ) { |
964 | struct acpi_gpio_event *event; | |
965 | ||
966 | list_for_each_entry(event, &achip->events, node) { | |
967 | if (event->pin == pin) { | |
968 | desc = event->desc; | |
969 | found = true; | |
970 | break; | |
971 | } | |
972 | } | |
973 | } | |
974 | ||
473ed7be | 975 | if (!found) { |
2eca25af AS |
976 | enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio); |
977 | const char *label = "ACPI:OpRegion"; | |
2eca25af | 978 | |
21abf103 | 979 | desc = gpiochip_request_own_desc(chip, pin, label, |
5923ea6c | 980 | GPIO_ACTIVE_HIGH, |
21abf103 | 981 | flags); |
e46cf32c | 982 | if (IS_ERR(desc)) { |
473ed7be MW |
983 | status = AE_ERROR; |
984 | mutex_unlock(&achip->conn_lock); | |
985 | goto out; | |
986 | } | |
987 | ||
473ed7be MW |
988 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
989 | if (!conn) { | |
990 | status = AE_NO_MEMORY; | |
991 | gpiochip_free_own_desc(desc); | |
992 | mutex_unlock(&achip->conn_lock); | |
993 | goto out; | |
994 | } | |
995 | ||
e46cf32c | 996 | conn->pin = pin; |
473ed7be MW |
997 | conn->desc = desc; |
998 | list_add_tail(&conn->node, &achip->conns); | |
999 | } | |
1000 | ||
1001 | mutex_unlock(&achip->conn_lock); | |
1002 | ||
1003 | if (function == ACPI_WRITE) | |
dc62b56a AL |
1004 | gpiod_set_raw_value_cansleep(desc, |
1005 | !!((1 << i) & *value)); | |
473ed7be | 1006 | else |
dc62b56a | 1007 | *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; |
473ed7be MW |
1008 | } |
1009 | ||
1010 | out: | |
1011 | ACPI_FREE(ares); | |
1012 | return status; | |
1013 | } | |
1014 | ||
1015 | static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) | |
1016 | { | |
1017 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 1018 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
1019 | acpi_status status; |
1020 | ||
1021 | INIT_LIST_HEAD(&achip->conns); | |
1022 | mutex_init(&achip->conn_lock); | |
1023 | status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
1024 | acpi_gpio_adr_space_handler, | |
1025 | NULL, achip); | |
1026 | if (ACPI_FAILURE(status)) | |
58383c78 LW |
1027 | dev_err(chip->parent, |
1028 | "Failed to install GPIO OpRegion handler\n"); | |
473ed7be MW |
1029 | } |
1030 | ||
1031 | static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) | |
1032 | { | |
1033 | struct gpio_chip *chip = achip->chip; | |
58383c78 | 1034 | acpi_handle handle = ACPI_HANDLE(chip->parent); |
473ed7be MW |
1035 | struct acpi_gpio_connection *conn, *tmp; |
1036 | acpi_status status; | |
1037 | ||
1038 | status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
1039 | acpi_gpio_adr_space_handler); | |
1040 | if (ACPI_FAILURE(status)) { | |
58383c78 LW |
1041 | dev_err(chip->parent, |
1042 | "Failed to remove GPIO OpRegion handler\n"); | |
473ed7be MW |
1043 | return; |
1044 | } | |
1045 | ||
1046 | list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { | |
1047 | gpiochip_free_own_desc(conn->desc); | |
1048 | list_del(&conn->node); | |
1049 | kfree(conn); | |
1050 | } | |
1051 | } | |
1052 | ||
fed7026a AS |
1053 | static struct gpio_desc * |
1054 | acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip, | |
1055 | struct fwnode_handle *fwnode, | |
1056 | const char **name, | |
1057 | unsigned long *lflags, | |
80c8d927 | 1058 | enum gpiod_flags *dflags) |
c80f1ba7 MW |
1059 | { |
1060 | struct gpio_chip *chip = achip->chip; | |
1061 | struct gpio_desc *desc; | |
1062 | u32 gpios[2]; | |
1063 | int ret; | |
1064 | ||
2d6c06f5 | 1065 | *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
c82064f2 AB |
1066 | *dflags = 0; |
1067 | *name = NULL; | |
1068 | ||
c80f1ba7 MW |
1069 | ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, |
1070 | ARRAY_SIZE(gpios)); | |
1071 | if (ret < 0) | |
1072 | return ERR_PTR(ret); | |
1073 | ||
03c4749d | 1074 | desc = gpiochip_get_desc(chip, gpios[0]); |
c80f1ba7 MW |
1075 | if (IS_ERR(desc)) |
1076 | return desc; | |
1077 | ||
c80f1ba7 MW |
1078 | if (gpios[1]) |
1079 | *lflags |= GPIO_ACTIVE_LOW; | |
1080 | ||
1081 | if (fwnode_property_present(fwnode, "input")) | |
1082 | *dflags |= GPIOD_IN; | |
1083 | else if (fwnode_property_present(fwnode, "output-low")) | |
1084 | *dflags |= GPIOD_OUT_LOW; | |
1085 | else if (fwnode_property_present(fwnode, "output-high")) | |
1086 | *dflags |= GPIOD_OUT_HIGH; | |
1087 | else | |
1088 | return ERR_PTR(-EINVAL); | |
1089 | ||
1090 | fwnode_property_read_string(fwnode, "line-name", name); | |
1091 | ||
1092 | return desc; | |
1093 | } | |
1094 | ||
1095 | static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip) | |
1096 | { | |
1097 | struct gpio_chip *chip = achip->chip; | |
1098 | struct fwnode_handle *fwnode; | |
1099 | ||
1100 | device_for_each_child_node(chip->parent, fwnode) { | |
fed7026a | 1101 | unsigned long lflags; |
80c8d927 | 1102 | enum gpiod_flags dflags; |
c80f1ba7 MW |
1103 | struct gpio_desc *desc; |
1104 | const char *name; | |
1105 | int ret; | |
1106 | ||
1107 | if (!fwnode_property_present(fwnode, "gpio-hog")) | |
1108 | continue; | |
1109 | ||
1110 | desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name, | |
1111 | &lflags, &dflags); | |
1112 | if (IS_ERR(desc)) | |
1113 | continue; | |
1114 | ||
1115 | ret = gpiod_hog(desc, name, lflags, dflags); | |
1116 | if (ret) { | |
1117 | dev_err(chip->parent, "Failed to hog GPIO\n"); | |
1b6998c9 | 1118 | fwnode_handle_put(fwnode); |
c80f1ba7 MW |
1119 | return; |
1120 | } | |
1121 | } | |
1122 | } | |
1123 | ||
664e3e5a MW |
1124 | void acpi_gpiochip_add(struct gpio_chip *chip) |
1125 | { | |
aa92b6f6 MW |
1126 | struct acpi_gpio_chip *acpi_gpio; |
1127 | acpi_handle handle; | |
1128 | acpi_status status; | |
1129 | ||
58383c78 | 1130 | if (!chip || !chip->parent) |
e9595f84 MW |
1131 | return; |
1132 | ||
58383c78 | 1133 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1134 | if (!handle) |
1135 | return; | |
1136 | ||
1137 | acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); | |
1138 | if (!acpi_gpio) { | |
58383c78 | 1139 | dev_err(chip->parent, |
aa92b6f6 MW |
1140 | "Failed to allocate memory for ACPI GPIO chip\n"); |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | acpi_gpio->chip = chip; | |
c103a10f | 1145 | INIT_LIST_HEAD(&acpi_gpio->events); |
78d3a92e | 1146 | INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry); |
aa92b6f6 MW |
1147 | |
1148 | status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); | |
1149 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1150 | dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n"); |
aa92b6f6 MW |
1151 | kfree(acpi_gpio); |
1152 | return; | |
1153 | } | |
1154 | ||
4035cc15 | 1155 | if (!chip->names) |
82270335 | 1156 | devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent)); |
4035cc15 | 1157 | |
473ed7be | 1158 | acpi_gpiochip_request_regions(acpi_gpio); |
c80f1ba7 | 1159 | acpi_gpiochip_scan_gpios(acpi_gpio); |
3f86a635 | 1160 | acpi_walk_dep_device_list(handle); |
664e3e5a MW |
1161 | } |
1162 | ||
1163 | void acpi_gpiochip_remove(struct gpio_chip *chip) | |
1164 | { | |
aa92b6f6 MW |
1165 | struct acpi_gpio_chip *acpi_gpio; |
1166 | acpi_handle handle; | |
1167 | acpi_status status; | |
1168 | ||
58383c78 | 1169 | if (!chip || !chip->parent) |
e9595f84 MW |
1170 | return; |
1171 | ||
58383c78 | 1172 | handle = ACPI_HANDLE(chip->parent); |
aa92b6f6 MW |
1173 | if (!handle) |
1174 | return; | |
1175 | ||
1176 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
1177 | if (ACPI_FAILURE(status)) { | |
58383c78 | 1178 | dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n"); |
aa92b6f6 MW |
1179 | return; |
1180 | } | |
1181 | ||
473ed7be | 1182 | acpi_gpiochip_free_regions(acpi_gpio); |
aa92b6f6 MW |
1183 | |
1184 | acpi_detach_data(handle, acpi_gpio_chip_dh); | |
1185 | kfree(acpi_gpio); | |
664e3e5a | 1186 | } |
66858527 | 1187 | |
6f7194a1 | 1188 | static int acpi_gpio_package_count(const union acpi_object *obj) |
66858527 RI |
1189 | { |
1190 | const union acpi_object *element = obj->package.elements; | |
1191 | const union acpi_object *end = element + obj->package.count; | |
1192 | unsigned int count = 0; | |
1193 | ||
1194 | while (element < end) { | |
6f7194a1 MW |
1195 | switch (element->type) { |
1196 | case ACPI_TYPE_LOCAL_REFERENCE: | |
1197 | element += 3; | |
1198 | /* Fallthrough */ | |
1199 | case ACPI_TYPE_INTEGER: | |
1200 | element++; | |
66858527 | 1201 | count++; |
6f7194a1 | 1202 | break; |
66858527 | 1203 | |
6f7194a1 MW |
1204 | default: |
1205 | return -EPROTO; | |
1206 | } | |
66858527 | 1207 | } |
6f7194a1 | 1208 | |
66858527 RI |
1209 | return count; |
1210 | } | |
1211 | ||
1212 | static int acpi_find_gpio_count(struct acpi_resource *ares, void *data) | |
1213 | { | |
1214 | unsigned int *count = data; | |
1215 | ||
1216 | if (ares->type == ACPI_RESOURCE_TYPE_GPIO) | |
1217 | *count += ares->data.gpio.pin_table_length; | |
1218 | ||
1219 | return 1; | |
1220 | } | |
1221 | ||
1222 | /** | |
85edcd01 AS |
1223 | * acpi_gpio_count - count the GPIOs associated with a device / function |
1224 | * @dev: GPIO consumer, can be %NULL for system-global GPIOs | |
66858527 | 1225 | * @con_id: function within the GPIO consumer |
85edcd01 AS |
1226 | * |
1227 | * Return: | |
1228 | * The number of GPIOs associated with a device / function or %-ENOENT, | |
1229 | * if no GPIO has been assigned to the requested function. | |
66858527 RI |
1230 | */ |
1231 | int acpi_gpio_count(struct device *dev, const char *con_id) | |
1232 | { | |
1233 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1234 | const union acpi_object *obj; | |
1235 | const struct acpi_gpio_mapping *gm; | |
1236 | int count = -ENOENT; | |
1237 | int ret; | |
1238 | char propname[32]; | |
1239 | unsigned int i; | |
1240 | ||
1241 | /* Try first from _DSD */ | |
1242 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
9e66504a | 1243 | if (con_id) |
66858527 RI |
1244 | snprintf(propname, sizeof(propname), "%s-%s", |
1245 | con_id, gpio_suffixes[i]); | |
1246 | else | |
1247 | snprintf(propname, sizeof(propname), "%s", | |
1248 | gpio_suffixes[i]); | |
1249 | ||
1250 | ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY, | |
1251 | &obj); | |
1252 | if (ret == 0) { | |
1253 | if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) | |
1254 | count = 1; | |
1255 | else if (obj->type == ACPI_TYPE_PACKAGE) | |
1256 | count = acpi_gpio_package_count(obj); | |
1257 | } else if (adev->driver_gpios) { | |
1258 | for (gm = adev->driver_gpios; gm->name; gm++) | |
1259 | if (strcmp(propname, gm->name) == 0) { | |
1260 | count = gm->size; | |
1261 | break; | |
1262 | } | |
1263 | } | |
4ed55016 | 1264 | if (count > 0) |
66858527 RI |
1265 | break; |
1266 | } | |
1267 | ||
1268 | /* Then from plain _CRS GPIOs */ | |
1269 | if (count < 0) { | |
1270 | struct list_head resource_list; | |
1271 | unsigned int crs_count = 0; | |
1272 | ||
6fe9da42 AS |
1273 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
1274 | return count; | |
1275 | ||
66858527 RI |
1276 | INIT_LIST_HEAD(&resource_list); |
1277 | acpi_dev_get_resources(adev, &resource_list, | |
1278 | acpi_find_gpio_count, &crs_count); | |
1279 | acpi_dev_free_resource_list(&resource_list); | |
1280 | if (crs_count > 0) | |
1281 | count = crs_count; | |
1282 | } | |
4ed55016 | 1283 | return count ? count : -ENOENT; |
66858527 | 1284 | } |
10cf4899 | 1285 | |
e59f5e08 HG |
1286 | /* Run deferred acpi_gpiochip_request_irqs() */ |
1287 | static int acpi_gpio_handle_deferred_request_irqs(void) | |
ca876c74 | 1288 | { |
78d3a92e HG |
1289 | struct acpi_gpio_chip *acpi_gpio, *tmp; |
1290 | ||
1291 | mutex_lock(&acpi_gpio_deferred_req_irqs_lock); | |
1292 | list_for_each_entry_safe(acpi_gpio, tmp, | |
1293 | &acpi_gpio_deferred_req_irqs_list, | |
e59f5e08 HG |
1294 | deferred_req_irqs_list_entry) |
1295 | acpi_gpiochip_request_irqs(acpi_gpio); | |
78d3a92e HG |
1296 | |
1297 | acpi_gpio_deferred_req_irqs_done = true; | |
1298 | mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); | |
ca876c74 BT |
1299 | |
1300 | return 0; | |
1301 | } | |
1302 | /* We must use _sync so that this runs after the first deferred_probe run */ | |
e59f5e08 | 1303 | late_initcall_sync(acpi_gpio_handle_deferred_request_irqs); |
61f7f7c8 HG |
1304 | |
1305 | static const struct dmi_system_id run_edge_events_on_boot_blacklist[] = { | |
1306 | { | |
1307 | .matches = { | |
1308 | DMI_MATCH(DMI_SYS_VENDOR, "MINIX"), | |
1309 | DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"), | |
1310 | } | |
1311 | }, | |
1312 | {} /* Terminating entry */ | |
1313 | }; | |
1314 | ||
1315 | static int acpi_gpio_setup_params(void) | |
1316 | { | |
1317 | if (run_edge_events_on_boot < 0) { | |
1318 | if (dmi_check_system(run_edge_events_on_boot_blacklist)) | |
1319 | run_edge_events_on_boot = 0; | |
1320 | else | |
1321 | run_edge_events_on_boot = 1; | |
1322 | } | |
1323 | ||
1324 | return 0; | |
1325 | } | |
1326 | ||
1327 | /* Directly after dmi_setup() which runs as core_initcall() */ | |
1328 | postcore_initcall(acpi_gpio_setup_params); |