summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpiolib-acpi.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpio/gpiolib-acpi.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
-rw-r--r--drivers/gpio/gpiolib-acpi.c1672
1 files changed, 1672 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
new file mode 100644
index 000000000..33d73687e
--- /dev/null
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -0,0 +1,1672 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACPI helpers for GPIO API
+ *
+ * Copyright (C) 2012, Intel Corporation
+ * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
+ * Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/dmi.h>
+#include <linux/errno.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
+#include <linux/export.h>
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+static int run_edge_events_on_boot = -1;
+module_param(run_edge_events_on_boot, int, 0444);
+MODULE_PARM_DESC(run_edge_events_on_boot,
+ "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
+
+static char *ignore_wake;
+module_param(ignore_wake, charp, 0444);
+MODULE_PARM_DESC(ignore_wake,
+ "controller@pin combos on which to ignore the ACPI wake flag "
+ "ignore_wake=controller@pin[,controller@pin[,...]]");
+
+static char *ignore_interrupt;
+module_param(ignore_interrupt, charp, 0444);
+MODULE_PARM_DESC(ignore_interrupt,
+ "controller@pin combos on which to ignore interrupt "
+ "ignore_interrupt=controller@pin[,controller@pin[,...]]");
+
+struct acpi_gpiolib_dmi_quirk {
+ bool no_edge_events_on_boot;
+ char *ignore_wake;
+ char *ignore_interrupt;
+};
+
+/**
+ * struct acpi_gpio_event - ACPI GPIO event handler data
+ *
+ * @node: list-entry of the events list of the struct acpi_gpio_chip
+ * @handle: handle of ACPI method to execute when the IRQ triggers
+ * @handler: handler function to pass to request_irq() when requesting the IRQ
+ * @pin: GPIO pin number on the struct gpio_chip
+ * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
+ * @irqflags: flags to pass to request_irq() when requesting the IRQ
+ * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
+ * @irq_requested:True if request_irq() has been done
+ * @desc: struct gpio_desc for the GPIO pin for this event
+ */
+struct acpi_gpio_event {
+ struct list_head node;
+ acpi_handle handle;
+ irq_handler_t handler;
+ unsigned int pin;
+ unsigned int irq;
+ unsigned long irqflags;
+ bool irq_is_wake;
+ bool irq_requested;
+ struct gpio_desc *desc;
+};
+
+struct acpi_gpio_connection {
+ struct list_head node;
+ unsigned int pin;
+ struct gpio_desc *desc;
+};
+
+struct acpi_gpio_chip {
+ /*
+ * ACPICA requires that the first field of the context parameter
+ * passed to acpi_install_address_space_handler() is large enough
+ * to hold struct acpi_connection_info.
+ */
+ struct acpi_connection_info conn_info;
+ struct list_head conns;
+ struct mutex conn_lock;
+ struct gpio_chip *chip;
+ struct list_head events;
+ struct list_head deferred_req_irqs_list_entry;
+};
+
+/*
+ * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
+ * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
+ * late_initcall_sync() handler, so that other builtin drivers can register their
+ * OpRegions before the event handlers can run. This list contains GPIO chips
+ * for which the acpi_gpiochip_request_irqs() call has been deferred.
+ */
+static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
+static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
+static bool acpi_gpio_deferred_req_irqs_done;
+
+static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
+{
+ return gc->parent && device_match_acpi_handle(gc->parent, data);
+}
+
+/**
+ * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
+ * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
+ * @pin: ACPI GPIO pin number (0-based, controller-relative)
+ *
+ * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
+ * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
+ * controller does not have GPIO chip registered at the moment. This is to
+ * support probe deferral.
+ */
+static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
+{
+ struct gpio_chip *chip;
+ acpi_handle handle;
+ acpi_status status;
+
+ status = acpi_get_handle(NULL, path, &handle);
+ if (ACPI_FAILURE(status))
+ return ERR_PTR(-ENODEV);
+
+ chip = gpiochip_find(handle, acpi_gpiochip_find);
+ if (!chip)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ return gpiochip_get_desc(chip, pin);
+}
+
+/**
+ * acpi_get_and_request_gpiod - Translate ACPI GPIO pin to GPIO descriptor and
+ * hold a refcount to the GPIO device.
+ * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
+ * @pin: ACPI GPIO pin number (0-based, controller-relative)
+ * @label: Label to pass to gpiod_request()
+ *
+ * This function is a simple pass-through to acpi_get_gpiod(), except that
+ * as it is intended for use outside of the GPIO layer (in a similar fashion to
+ * gpiod_get_index() for example) it also holds a reference to the GPIO device.
+ */
+struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label)
+{
+ struct gpio_desc *gpio;
+ int ret;
+
+ gpio = acpi_get_gpiod(path, pin);
+ if (IS_ERR(gpio))
+ return gpio;
+
+ ret = gpiod_request(gpio, label);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return gpio;
+}
+EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod);
+
+static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
+{
+ struct acpi_gpio_event *event = data;
+
+ acpi_evaluate_object(event->handle, NULL, NULL, NULL);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
+{
+ struct acpi_gpio_event *event = data;
+
+ acpi_execute_simple_method(event->handle, NULL, event->pin);
+
+ return IRQ_HANDLED;
+}
+
+static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
+{
+ /* The address of this function is used as a key. */
+}
+
+bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
+ struct acpi_resource_gpio **agpio)
+{
+ struct acpi_resource_gpio *gpio;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return false;
+
+ gpio = &ares->data.gpio;
+ if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
+ return false;
+
+ *agpio = gpio;
+ return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
+
+/**
+ * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
+ * I/O resource or return False if not.
+ * @ares: Pointer to the ACPI resource to fetch
+ * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
+ */
+bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+ struct acpi_resource_gpio **agpio)
+{
+ struct acpi_resource_gpio *gpio;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return false;
+
+ gpio = &ares->data.gpio;
+ if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
+ return false;
+
+ *agpio = gpio;
+ return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
+
+static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
+ struct acpi_gpio_event *event)
+{
+ struct device *parent = acpi_gpio->chip->parent;
+ int ret, value;
+
+ ret = request_threaded_irq(event->irq, NULL, event->handler,
+ event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
+ if (ret) {
+ dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
+ return;
+ }
+
+ if (event->irq_is_wake)
+ enable_irq_wake(event->irq);
+
+ event->irq_requested = true;
+
+ /* Make sure we trigger the initial state of edge-triggered IRQs */
+ if (run_edge_events_on_boot &&
+ (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
+ value = gpiod_get_raw_value_cansleep(event->desc);
+ if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
+ ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
+ event->handler(event->irq, event);
+ }
+}
+
+static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
+{
+ struct acpi_gpio_event *event;
+
+ list_for_each_entry(event, &acpi_gpio->events, node)
+ acpi_gpiochip_request_irq(acpi_gpio, event);
+}
+
+static enum gpiod_flags
+acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
+{
+ /* GpioInt() implies input configuration */
+ if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
+ return GPIOD_IN;
+
+ switch (agpio->io_restriction) {
+ case ACPI_IO_RESTRICT_INPUT:
+ return GPIOD_IN;
+ case ACPI_IO_RESTRICT_OUTPUT:
+ /*
+ * ACPI GPIO resources don't contain an initial value for the
+ * GPIO. Therefore we deduce that value from the pull field
+ * and the polarity instead. If the pin is pulled up we assume
+ * default to be high, if it is pulled down we assume default
+ * to be low, otherwise we leave pin untouched. For active low
+ * polarity values will be switched. See also
+ * Documentation/firmware-guide/acpi/gpio-properties.rst.
+ */
+ switch (agpio->pin_config) {
+ case ACPI_PIN_CONFIG_PULLUP:
+ return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
+ case ACPI_PIN_CONFIG_PULLDOWN:
+ return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * Assume that the BIOS has configured the direction and pull
+ * accordingly.
+ */
+ return GPIOD_ASIS;
+}
+
+static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
+ struct acpi_resource_gpio *agpio,
+ unsigned int index,
+ const char *label)
+{
+ int polarity = GPIO_ACTIVE_HIGH;
+ enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
+ unsigned int pin = agpio->pin_table[index];
+ struct gpio_desc *desc;
+ int ret;
+
+ desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
+ if (IS_ERR(desc))
+ return desc;
+
+ /* ACPI uses hundredths of milliseconds units */
+ ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
+ if (ret)
+ dev_warn(chip->parent,
+ "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
+ pin, ret);
+
+ return desc;
+}
+
+static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
+ unsigned int pin_in)
+{
+ const char *controller, *pin_str;
+ unsigned int pin;
+ char *endp;
+ int len;
+
+ controller = ignore_list;
+ while (controller) {
+ pin_str = strchr(controller, '@');
+ if (!pin_str)
+ goto err;
+
+ len = pin_str - controller;
+ if (len == strlen(controller_in) &&
+ strncmp(controller, controller_in, len) == 0) {
+ pin = simple_strtoul(pin_str + 1, &endp, 10);
+ if (*endp != 0 && *endp != ',')
+ goto err;
+
+ if (pin == pin_in)
+ return true;
+ }
+
+ controller = strchr(controller, ',');
+ if (controller)
+ controller++;
+ }
+
+ return false;
+err:
+ pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
+ return false;
+}
+
+static bool acpi_gpio_irq_is_wake(struct device *parent,
+ const struct acpi_resource_gpio *agpio)
+{
+ unsigned int pin = agpio->pin_table[0];
+
+ if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
+ return false;
+
+ if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
+ dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
+ return false;
+ }
+
+ return true;
+}
+
+/* Always returns AE_OK so that we keep looping over the resources */
+static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
+ void *context)
+{
+ struct acpi_gpio_chip *acpi_gpio = context;
+ struct gpio_chip *chip = acpi_gpio->chip;
+ struct acpi_resource_gpio *agpio;
+ acpi_handle handle, evt_handle;
+ struct acpi_gpio_event *event;
+ irq_handler_t handler = NULL;
+ struct gpio_desc *desc;
+ unsigned int pin;
+ int ret, irq;
+
+ if (!acpi_gpio_get_irq_resource(ares, &agpio))
+ return AE_OK;
+
+ handle = ACPI_HANDLE(chip->parent);
+ pin = agpio->pin_table[0];
+
+ if (pin <= 255) {
+ char ev_name[8];
+ sprintf(ev_name, "_%c%02X",
+ agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
+ pin);
+ if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
+ handler = acpi_gpio_irq_handler;
+ }
+ if (!handler) {
+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
+ handler = acpi_gpio_irq_handler_evt;
+ }
+ if (!handler)
+ return AE_OK;
+
+ desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
+ if (IS_ERR(desc)) {
+ dev_err(chip->parent,
+ "Failed to request GPIO for pin 0x%04X, err %ld\n",
+ pin, PTR_ERR(desc));
+ return AE_OK;
+ }
+
+ ret = gpiochip_lock_as_irq(chip, pin);
+ if (ret) {
+ dev_err(chip->parent,
+ "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
+ pin, ret);
+ goto fail_free_desc;
+ }
+
+ irq = gpiod_to_irq(desc);
+ if (irq < 0) {
+ dev_err(chip->parent,
+ "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
+ pin, irq);
+ goto fail_unlock_irq;
+ }
+
+ if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
+ dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
+ return AE_OK;
+ }
+
+ event = kzalloc(sizeof(*event), GFP_KERNEL);
+ if (!event)
+ goto fail_unlock_irq;
+
+ event->irqflags = IRQF_ONESHOT;
+ if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
+ if (agpio->polarity == ACPI_ACTIVE_HIGH)
+ event->irqflags |= IRQF_TRIGGER_HIGH;
+ else
+ event->irqflags |= IRQF_TRIGGER_LOW;
+ } else {
+ switch (agpio->polarity) {
+ case ACPI_ACTIVE_HIGH:
+ event->irqflags |= IRQF_TRIGGER_RISING;
+ break;
+ case ACPI_ACTIVE_LOW:
+ event->irqflags |= IRQF_TRIGGER_FALLING;
+ break;
+ default:
+ event->irqflags |= IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING;
+ break;
+ }
+ }
+
+ event->handle = evt_handle;
+ event->handler = handler;
+ event->irq = irq;
+ event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
+ event->pin = pin;
+ event->desc = desc;
+
+ list_add_tail(&event->node, &acpi_gpio->events);
+
+ return AE_OK;
+
+fail_unlock_irq:
+ gpiochip_unlock_as_irq(chip, pin);
+fail_free_desc:
+ gpiochip_free_own_desc(desc);
+
+ return AE_OK;
+}
+
+/**
+ * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
+ * @chip: GPIO chip
+ *
+ * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
+ * handled by ACPI event methods which need to be called from the GPIO
+ * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
+ * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
+ * the ACPI event methods for those pins.
+ */
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
+{
+ struct acpi_gpio_chip *acpi_gpio;
+ acpi_handle handle;
+ acpi_status status;
+ bool defer;
+
+ if (!chip->parent || !chip->to_irq)
+ return;
+
+ handle = ACPI_HANDLE(chip->parent);
+ if (!handle)
+ return;
+
+ status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+ if (ACPI_FAILURE(status))
+ return;
+
+ acpi_walk_resources(handle, "_AEI",
+ acpi_gpiochip_alloc_event, acpi_gpio);
+
+ mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+ defer = !acpi_gpio_deferred_req_irqs_done;
+ if (defer)
+ list_add(&acpi_gpio->deferred_req_irqs_list_entry,
+ &acpi_gpio_deferred_req_irqs_list);
+ mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+ if (defer)
+ return;
+
+ acpi_gpiochip_request_irqs(acpi_gpio);
+}
+EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
+
+/**
+ * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
+ * @chip: GPIO chip
+ *
+ * Free interrupts associated with GPIO ACPI event method for the given
+ * GPIO chip.
+ */
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+{
+ struct acpi_gpio_chip *acpi_gpio;
+ struct acpi_gpio_event *event, *ep;
+ acpi_handle handle;
+ acpi_status status;
+
+ if (!chip->parent || !chip->to_irq)
+ return;
+
+ handle = ACPI_HANDLE(chip->parent);
+ if (!handle)
+ return;
+
+ status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+ if (ACPI_FAILURE(status))
+ return;
+
+ mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+ if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
+ list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
+ mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+ list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
+ if (event->irq_requested) {
+ if (event->irq_is_wake)
+ disable_irq_wake(event->irq);
+
+ free_irq(event->irq, event);
+ }
+
+ gpiochip_unlock_as_irq(chip, event->pin);
+ gpiochip_free_own_desc(event->desc);
+ list_del(&event->node);
+ kfree(event);
+ }
+}
+EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
+
+int acpi_dev_add_driver_gpios(struct acpi_device *adev,
+ const struct acpi_gpio_mapping *gpios)
+{
+ if (adev && gpios) {
+ adev->driver_gpios = gpios;
+ return 0;
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
+
+void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
+{
+ if (adev)
+ adev->driver_gpios = NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
+
+static void acpi_dev_release_driver_gpios(void *adev)
+{
+ acpi_dev_remove_driver_gpios(adev);
+}
+
+int devm_acpi_dev_add_driver_gpios(struct device *dev,
+ const struct acpi_gpio_mapping *gpios)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ int ret;
+
+ ret = acpi_dev_add_driver_gpios(adev, gpios);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
+}
+EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
+
+static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
+ const char *name, int index,
+ struct fwnode_reference_args *args,
+ unsigned int *quirks)
+{
+ const struct acpi_gpio_mapping *gm;
+
+ if (!adev->driver_gpios)
+ return false;
+
+ for (gm = adev->driver_gpios; gm->name; gm++)
+ if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
+ const struct acpi_gpio_params *par = gm->data + index;
+
+ args->fwnode = acpi_fwnode_handle(adev);
+ args->args[0] = par->crs_entry_index;
+ args->args[1] = par->line_index;
+ args->args[2] = par->active_low;
+ args->nargs = 3;
+
+ *quirks = gm->quirks;
+ return true;
+ }
+
+ return false;
+}
+
+static int
+__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
+{
+ const enum gpiod_flags mask =
+ GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
+ GPIOD_FLAGS_BIT_DIR_VAL;
+ int ret = 0;
+
+ /*
+ * Check if the BIOS has IoRestriction with explicitly set direction
+ * and update @flags accordingly. Otherwise use whatever caller asked
+ * for.
+ */
+ if (update & GPIOD_FLAGS_BIT_DIR_SET) {
+ enum gpiod_flags diff = *flags ^ update;
+
+ /*
+ * Check if caller supplied incompatible GPIO initialization
+ * flags.
+ *
+ * Return %-EINVAL to notify that firmware has different
+ * settings and we are going to use them.
+ */
+ if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
+ ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
+ ret = -EINVAL;
+ *flags = (*flags & ~mask) | (update & mask);
+ }
+ return ret;
+}
+
+int
+acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
+{
+ struct device *dev = &info->adev->dev;
+ enum gpiod_flags old = *flags;
+ int ret;
+
+ ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
+ if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
+ if (ret)
+ dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
+ } else {
+ if (ret)
+ dev_dbg(dev, "Override GPIO initialization flags\n");
+ *flags = old;
+ }
+
+ return ret;
+}
+
+int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
+ struct acpi_gpio_info *info)
+{
+ switch (info->pin_config) {
+ case ACPI_PIN_CONFIG_PULLUP:
+ *lookupflags |= GPIO_PULL_UP;
+ break;
+ case ACPI_PIN_CONFIG_PULLDOWN:
+ *lookupflags |= GPIO_PULL_DOWN;
+ break;
+ case ACPI_PIN_CONFIG_NOPULL:
+ *lookupflags |= GPIO_PULL_DISABLE;
+ break;
+ default:
+ break;
+ }
+
+ if (info->polarity == GPIO_ACTIVE_LOW)
+ *lookupflags |= GPIO_ACTIVE_LOW;
+
+ return 0;
+}
+
+struct acpi_gpio_lookup {
+ struct acpi_gpio_info info;
+ int index;
+ u16 pin_index;
+ bool active_low;
+ struct gpio_desc *desc;
+ int n;
+};
+
+static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
+{
+ struct acpi_gpio_lookup *lookup = data;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return 1;
+
+ if (!lookup->desc) {
+ const struct acpi_resource_gpio *agpio = &ares->data.gpio;
+ bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+ struct gpio_desc *desc;
+ u16 pin_index;
+
+ if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
+ lookup->index++;
+
+ if (lookup->n++ != lookup->index)
+ return 1;
+
+ pin_index = lookup->pin_index;
+ if (pin_index >= agpio->pin_table_length)
+ return 1;
+
+ if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
+ desc = gpio_to_desc(agpio->pin_table[pin_index]);
+ else
+ desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
+ agpio->pin_table[pin_index]);
+ lookup->desc = desc;
+ lookup->info.pin_config = agpio->pin_config;
+ lookup->info.debounce = agpio->debounce_timeout;
+ lookup->info.gpioint = gpioint;
+ lookup->info.wake_capable = acpi_gpio_irq_is_wake(&lookup->info.adev->dev, agpio);
+
+ /*
+ * Polarity and triggering are only specified for GpioInt
+ * resource.
+ * Note: we expect here:
+ * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
+ * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
+ */
+ if (lookup->info.gpioint) {
+ lookup->info.polarity = agpio->polarity;
+ lookup->info.triggering = agpio->triggering;
+ } else {
+ lookup->info.polarity = lookup->active_low;
+ }
+
+ lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
+ }
+
+ return 1;
+}
+
+static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
+ struct acpi_gpio_info *info)
+{
+ struct acpi_device *adev = lookup->info.adev;
+ struct list_head res_list;
+ int ret;
+
+ INIT_LIST_HEAD(&res_list);
+
+ ret = acpi_dev_get_resources(adev, &res_list,
+ acpi_populate_gpio_lookup,
+ lookup);
+ if (ret < 0)
+ return ret;
+
+ acpi_dev_free_resource_list(&res_list);
+
+ if (!lookup->desc)
+ return -ENOENT;
+
+ if (info)
+ *info = lookup->info;
+ return 0;
+}
+
+static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
+ const char *propname, int index,
+ struct acpi_gpio_lookup *lookup)
+{
+ struct fwnode_reference_args args;
+ unsigned int quirks = 0;
+ int ret;
+
+ memset(&args, 0, sizeof(args));
+ ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
+ &args);
+ if (ret) {
+ struct acpi_device *adev = to_acpi_device_node(fwnode);
+
+ if (!adev)
+ return ret;
+
+ if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
+ &quirks))
+ return ret;
+ }
+ /*
+ * The property was found and resolved, so need to lookup the GPIO based
+ * on returned args.
+ */
+ if (!to_acpi_device_node(args.fwnode))
+ return -EINVAL;
+ if (args.nargs != 3)
+ return -EPROTO;
+
+ lookup->index = args.args[0];
+ lookup->pin_index = args.args[1];
+ lookup->active_low = !!args.args[2];
+
+ lookup->info.adev = to_acpi_device_node(args.fwnode);
+ lookup->info.quirks = quirks;
+
+ return 0;
+}
+
+/**
+ * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
+ * @adev: pointer to a ACPI device to get GPIO from
+ * @propname: Property name of the GPIO (optional)
+ * @index: index of GpioIo/GpioInt resource (starting from %0)
+ * @info: info pointer to fill in (optional)
+ *
+ * Function goes through ACPI resources for @adev and based on @index looks
+ * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
+ * and returns it. @index matches GpioIo/GpioInt resources only so if there
+ * are total %3 GPIO resources, the index goes from %0 to %2.
+ *
+ * If @propname is specified the GPIO is looked using device property. In
+ * that case @index is used to select the GPIO entry in the property value
+ * (in case of multiple).
+ *
+ * If the GPIO cannot be translated or there is an error, an ERR_PTR is
+ * returned.
+ *
+ * Note: if the GPIO resource has multiple entries in the pin list, this
+ * function only returns the first.
+ */
+static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
+ const char *propname, int index,
+ struct acpi_gpio_info *info)
+{
+ struct acpi_gpio_lookup lookup;
+ int ret;
+
+ if (!adev)
+ return ERR_PTR(-ENODEV);
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.index = index;
+
+ if (propname) {
+ dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
+
+ ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
+ propname, index, &lookup);
+ if (ret)
+ return ERR_PTR(ret);
+
+ dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
+ dev_name(&lookup.info.adev->dev), lookup.index,
+ lookup.pin_index, lookup.active_low);
+ } else {
+ dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
+ lookup.info.adev = adev;
+ }
+
+ ret = acpi_gpio_resource_lookup(&lookup, info);
+ return ret ? ERR_PTR(ret) : lookup.desc;
+}
+
+static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
+ const char *con_id)
+{
+ /* Never allow fallback if the device has properties */
+ if (acpi_dev_has_props(adev) || adev->driver_gpios)
+ return false;
+
+ return con_id == NULL;
+}
+
+struct gpio_desc *acpi_find_gpio(struct device *dev,
+ const char *con_id,
+ unsigned int idx,
+ enum gpiod_flags *dflags,
+ unsigned long *lookupflags)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ struct acpi_gpio_info info;
+ struct gpio_desc *desc;
+ char propname[32];
+ int i;
+
+ /* Try first from _DSD */
+ for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
+ if (con_id) {
+ snprintf(propname, sizeof(propname), "%s-%s",
+ con_id, gpio_suffixes[i]);
+ } else {
+ snprintf(propname, sizeof(propname), "%s",
+ gpio_suffixes[i]);
+ }
+
+ desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
+ if (!IS_ERR(desc))
+ break;
+ if (PTR_ERR(desc) == -EPROBE_DEFER)
+ return ERR_CAST(desc);
+ }
+
+ /* Then from plain _CRS GPIOs */
+ if (IS_ERR(desc)) {
+ if (!acpi_can_fallback_to_crs(adev, con_id))
+ return ERR_PTR(-ENOENT);
+
+ desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
+ if (IS_ERR(desc))
+ return desc;
+ }
+
+ if (info.gpioint &&
+ (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
+ dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
+ return ERR_PTR(-ENOENT);
+ }
+
+ acpi_gpio_update_gpiod_flags(dflags, &info);
+ acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
+ return desc;
+}
+
+/**
+ * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
+ * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
+ * @propname: Property name of the GPIO
+ * @index: index of GpioIo/GpioInt resource (starting from %0)
+ * @info: info pointer to fill in (optional)
+ *
+ * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
+ * Otherwise (i.e. it is a data-only non-device object), use the property-based
+ * GPIO lookup to get to the GPIO resource with the relevant information and use
+ * that to obtain the GPIO descriptor to return.
+ *
+ * If the GPIO cannot be translated or there is an error an ERR_PTR is
+ * returned.
+ */
+struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
+ const char *propname, int index,
+ struct acpi_gpio_info *info)
+{
+ struct acpi_gpio_lookup lookup;
+ struct acpi_device *adev;
+ int ret;
+
+ adev = to_acpi_device_node(fwnode);
+ if (adev)
+ return acpi_get_gpiod_by_index(adev, propname, index, info);
+
+ if (!is_acpi_data_node(fwnode))
+ return ERR_PTR(-ENODEV);
+
+ if (!propname)
+ return ERR_PTR(-EINVAL);
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.index = index;
+
+ ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = acpi_gpio_resource_lookup(&lookup, info);
+ return ret ? ERR_PTR(ret) : lookup.desc;
+}
+
+/**
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * @adev: pointer to a ACPI device to get IRQ from
+ * @name: optional name of GpioInt resource
+ * @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to true if the IRQ is wake capable
+ *
+ * If the device has one or more GpioInt resources, this function can be
+ * used to translate from the GPIO offset in the resource to the Linux IRQ
+ * number.
+ *
+ * The function is idempotent, though each time it runs it will configure GPIO
+ * pin direction according to the flags in GpioInt resource.
+ *
+ * The function takes optional @name parameter. If the resource has a property
+ * name, then only those will be taken into account.
+ *
+ * The GPIO is considered wake capable if the GpioInt resource specifies
+ * SharedAndWake or ExclusiveAndWake.
+ *
+ * Return: Linux IRQ number (> %0) on success, negative errno on failure.
+ */
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+ bool *wake_capable)
+{
+ int idx, i;
+ unsigned int irq_flags;
+ int ret;
+
+ for (i = 0, idx = 0; idx <= index; i++) {
+ struct acpi_gpio_info info;
+ struct gpio_desc *desc;
+
+ desc = acpi_get_gpiod_by_index(adev, name, i, &info);
+
+ /* Ignore -EPROBE_DEFER, it only matters if idx matches */
+ if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
+ return PTR_ERR(desc);
+
+ if (info.gpioint && idx++ == index) {
+ unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
+ enum gpiod_flags dflags = GPIOD_ASIS;
+ char label[32];
+ int irq;
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ irq = gpiod_to_irq(desc);
+ if (irq < 0)
+ return irq;
+
+ acpi_gpio_update_gpiod_flags(&dflags, &info);
+ acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
+
+ snprintf(label, sizeof(label), "GpioInt() %d", index);
+ ret = gpiod_configure_flags(desc, label, lflags, dflags);
+ if (ret < 0)
+ return ret;
+
+ /* ACPI uses hundredths of milliseconds units */
+ ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
+ if (ret)
+ return ret;
+
+ irq_flags = acpi_dev_get_irq_type(info.triggering,
+ info.polarity);
+
+ /*
+ * If the IRQ is not already in use then set type
+ * if specified and different than the current one.
+ */
+ if (can_request_irq(irq, irq_flags)) {
+ if (irq_flags != IRQ_TYPE_NONE &&
+ irq_flags != irq_get_trigger_type(irq))
+ irq_set_irq_type(irq, irq_flags);
+ } else {
+ dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
+ }
+
+ /* avoid suspend issues with GPIOs when systems are using S3 */
+ if (wake_capable && acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
+ *wake_capable = info.wake_capable;
+
+ return irq;
+ }
+
+ }
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
+
+static acpi_status
+acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
+ u32 bits, u64 *value, void *handler_context,
+ void *region_context)
+{
+ struct acpi_gpio_chip *achip = region_context;
+ struct gpio_chip *chip = achip->chip;
+ struct acpi_resource_gpio *agpio;
+ struct acpi_resource *ares;
+ u16 pin_index = address;
+ acpi_status status;
+ int length;
+ int i;
+
+ status = acpi_buffer_to_resource(achip->conn_info.connection,
+ achip->conn_info.length, &ares);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
+ ACPI_FREE(ares);
+ return AE_BAD_PARAMETER;
+ }
+
+ agpio = &ares->data.gpio;
+
+ if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
+ function == ACPI_WRITE)) {
+ ACPI_FREE(ares);
+ return AE_BAD_PARAMETER;
+ }
+
+ length = min_t(u16, agpio->pin_table_length, pin_index + bits);
+ for (i = pin_index; i < length; ++i) {
+ unsigned int pin = agpio->pin_table[i];
+ struct acpi_gpio_connection *conn;
+ struct gpio_desc *desc;
+ bool found;
+
+ mutex_lock(&achip->conn_lock);
+
+ found = false;
+ list_for_each_entry(conn, &achip->conns, node) {
+ if (conn->pin == pin) {
+ found = true;
+ desc = conn->desc;
+ break;
+ }
+ }
+
+ /*
+ * The same GPIO can be shared between operation region and
+ * event but only if the access here is ACPI_READ. In that
+ * case we "borrow" the event GPIO instead.
+ */
+ if (!found && agpio->shareable == ACPI_SHARED &&
+ function == ACPI_READ) {
+ struct acpi_gpio_event *event;
+
+ list_for_each_entry(event, &achip->events, node) {
+ if (event->pin == pin) {
+ desc = event->desc;
+ found = true;
+ break;
+ }
+ }
+ }
+
+ if (!found) {
+ desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
+ if (IS_ERR(desc)) {
+ mutex_unlock(&achip->conn_lock);
+ status = AE_ERROR;
+ goto out;
+ }
+
+ conn = kzalloc(sizeof(*conn), GFP_KERNEL);
+ if (!conn) {
+ gpiochip_free_own_desc(desc);
+ mutex_unlock(&achip->conn_lock);
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ conn->pin = pin;
+ conn->desc = desc;
+ list_add_tail(&conn->node, &achip->conns);
+ }
+
+ mutex_unlock(&achip->conn_lock);
+
+ if (function == ACPI_WRITE)
+ gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
+ else
+ *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
+ }
+
+out:
+ ACPI_FREE(ares);
+ return status;
+}
+
+static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
+{
+ struct gpio_chip *chip = achip->chip;
+ acpi_handle handle = ACPI_HANDLE(chip->parent);
+ acpi_status status;
+
+ INIT_LIST_HEAD(&achip->conns);
+ mutex_init(&achip->conn_lock);
+ status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
+ acpi_gpio_adr_space_handler,
+ NULL, achip);
+ if (ACPI_FAILURE(status))
+ dev_err(chip->parent,
+ "Failed to install GPIO OpRegion handler\n");
+}
+
+static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
+{
+ struct gpio_chip *chip = achip->chip;
+ acpi_handle handle = ACPI_HANDLE(chip->parent);
+ struct acpi_gpio_connection *conn, *tmp;
+ acpi_status status;
+
+ status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
+ acpi_gpio_adr_space_handler);
+ if (ACPI_FAILURE(status)) {
+ dev_err(chip->parent,
+ "Failed to remove GPIO OpRegion handler\n");
+ return;
+ }
+
+ list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
+ gpiochip_free_own_desc(conn->desc);
+ list_del(&conn->node);
+ kfree(conn);
+ }
+}
+
+static struct gpio_desc *
+acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
+ struct fwnode_handle *fwnode,
+ const char **name,
+ unsigned long *lflags,
+ enum gpiod_flags *dflags)
+{
+ struct gpio_chip *chip = achip->chip;
+ struct gpio_desc *desc;
+ u32 gpios[2];
+ int ret;
+
+ *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
+ *dflags = GPIOD_ASIS;
+ *name = NULL;
+
+ ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
+ ARRAY_SIZE(gpios));
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ desc = gpiochip_get_desc(chip, gpios[0]);
+ if (IS_ERR(desc))
+ return desc;
+
+ if (gpios[1])
+ *lflags |= GPIO_ACTIVE_LOW;
+
+ if (fwnode_property_present(fwnode, "input"))
+ *dflags |= GPIOD_IN;
+ else if (fwnode_property_present(fwnode, "output-low"))
+ *dflags |= GPIOD_OUT_LOW;
+ else if (fwnode_property_present(fwnode, "output-high"))
+ *dflags |= GPIOD_OUT_HIGH;
+ else
+ return ERR_PTR(-EINVAL);
+
+ fwnode_property_read_string(fwnode, "line-name", name);
+
+ return desc;
+}
+
+static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
+{
+ struct gpio_chip *chip = achip->chip;
+ struct fwnode_handle *fwnode;
+
+ device_for_each_child_node(chip->parent, fwnode) {
+ unsigned long lflags;
+ enum gpiod_flags dflags;
+ struct gpio_desc *desc;
+ const char *name;
+ int ret;
+
+ if (!fwnode_property_present(fwnode, "gpio-hog"))
+ continue;
+
+ desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
+ &lflags, &dflags);
+ if (IS_ERR(desc))
+ continue;
+
+ ret = gpiod_hog(desc, name, lflags, dflags);
+ if (ret) {
+ dev_err(chip->parent, "Failed to hog GPIO\n");
+ fwnode_handle_put(fwnode);
+ return;
+ }
+ }
+}
+
+void acpi_gpiochip_add(struct gpio_chip *chip)
+{
+ struct acpi_gpio_chip *acpi_gpio;
+ struct acpi_device *adev;
+ acpi_status status;
+
+ if (!chip || !chip->parent)
+ return;
+
+ adev = ACPI_COMPANION(chip->parent);
+ if (!adev)
+ return;
+
+ acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
+ if (!acpi_gpio) {
+ dev_err(chip->parent,
+ "Failed to allocate memory for ACPI GPIO chip\n");
+ return;
+ }
+
+ acpi_gpio->chip = chip;
+ INIT_LIST_HEAD(&acpi_gpio->events);
+ INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
+
+ status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
+ if (ACPI_FAILURE(status)) {
+ dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
+ kfree(acpi_gpio);
+ return;
+ }
+
+ acpi_gpiochip_request_regions(acpi_gpio);
+ acpi_gpiochip_scan_gpios(acpi_gpio);
+ acpi_dev_clear_dependencies(adev);
+}
+
+void acpi_gpiochip_remove(struct gpio_chip *chip)
+{
+ struct acpi_gpio_chip *acpi_gpio;
+ acpi_handle handle;
+ acpi_status status;
+
+ if (!chip || !chip->parent)
+ return;
+
+ handle = ACPI_HANDLE(chip->parent);
+ if (!handle)
+ return;
+
+ status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
+ return;
+ }
+
+ acpi_gpiochip_free_regions(acpi_gpio);
+
+ acpi_detach_data(handle, acpi_gpio_chip_dh);
+ kfree(acpi_gpio);
+}
+
+void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
+{
+ /* Set default fwnode to parent's one if present */
+ if (gc->parent)
+ ACPI_COMPANION_SET(&gdev->dev, ACPI_COMPANION(gc->parent));
+
+ if (gc->fwnode)
+ device_set_node(&gdev->dev, gc->fwnode);
+}
+
+static int acpi_gpio_package_count(const union acpi_object *obj)
+{
+ const union acpi_object *element = obj->package.elements;
+ const union acpi_object *end = element + obj->package.count;
+ unsigned int count = 0;
+
+ while (element < end) {
+ switch (element->type) {
+ case ACPI_TYPE_LOCAL_REFERENCE:
+ element += 3;
+ fallthrough;
+ case ACPI_TYPE_INTEGER:
+ element++;
+ count++;
+ break;
+
+ default:
+ return -EPROTO;
+ }
+ }
+
+ return count;
+}
+
+static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
+{
+ unsigned int *count = data;
+
+ if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
+ *count += ares->data.gpio.pin_table_length;
+
+ return 1;
+}
+
+/**
+ * acpi_gpio_count - count the GPIOs associated with a device / function
+ * @dev: GPIO consumer, can be %NULL for system-global GPIOs
+ * @con_id: function within the GPIO consumer
+ *
+ * Return:
+ * The number of GPIOs associated with a device / function or %-ENOENT,
+ * if no GPIO has been assigned to the requested function.
+ */
+int acpi_gpio_count(struct device *dev, const char *con_id)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ const union acpi_object *obj;
+ const struct acpi_gpio_mapping *gm;
+ int count = -ENOENT;
+ int ret;
+ char propname[32];
+ unsigned int i;
+
+ /* Try first from _DSD */
+ for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
+ if (con_id)
+ snprintf(propname, sizeof(propname), "%s-%s",
+ con_id, gpio_suffixes[i]);
+ else
+ snprintf(propname, sizeof(propname), "%s",
+ gpio_suffixes[i]);
+
+ ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
+ &obj);
+ if (ret == 0) {
+ if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
+ count = 1;
+ else if (obj->type == ACPI_TYPE_PACKAGE)
+ count = acpi_gpio_package_count(obj);
+ } else if (adev->driver_gpios) {
+ for (gm = adev->driver_gpios; gm->name; gm++)
+ if (strcmp(propname, gm->name) == 0) {
+ count = gm->size;
+ break;
+ }
+ }
+ if (count > 0)
+ break;
+ }
+
+ /* Then from plain _CRS GPIOs */
+ if (count < 0) {
+ struct list_head resource_list;
+ unsigned int crs_count = 0;
+
+ if (!acpi_can_fallback_to_crs(adev, con_id))
+ return count;
+
+ INIT_LIST_HEAD(&resource_list);
+ acpi_dev_get_resources(adev, &resource_list,
+ acpi_find_gpio_count, &crs_count);
+ acpi_dev_free_resource_list(&resource_list);
+ if (crs_count > 0)
+ count = crs_count;
+ }
+ return count ? count : -ENOENT;
+}
+
+/* Run deferred acpi_gpiochip_request_irqs() */
+static int __init acpi_gpio_handle_deferred_request_irqs(void)
+{
+ struct acpi_gpio_chip *acpi_gpio, *tmp;
+
+ mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+ list_for_each_entry_safe(acpi_gpio, tmp,
+ &acpi_gpio_deferred_req_irqs_list,
+ deferred_req_irqs_list_entry)
+ acpi_gpiochip_request_irqs(acpi_gpio);
+
+ acpi_gpio_deferred_req_irqs_done = true;
+ mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+ return 0;
+}
+/* We must use _sync so that this runs after the first deferred_probe run */
+late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
+
+static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
+ {
+ /*
+ * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
+ * a non existing micro-USB-B connector which puts the HDMI
+ * DDC pins in GPIO mode, breaking HDMI support.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .no_edge_events_on_boot = true,
+ },
+ },
+ {
+ /*
+ * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
+ * instead of controlling the actual micro-USB-B turns the 5V
+ * boost for its USB-A connector off. The actual micro-USB-B
+ * connector is wired for charging only.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .no_edge_events_on_boot = true,
+ },
+ },
+ {
+ /*
+ * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
+ * external embedded-controller connected via I2C + an ACPI GPIO
+ * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "INT33FC:02@12",
+ },
+ },
+ {
+ /*
+ * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
+ * external embedded-controller connected via I2C + an ACPI GPIO
+ * event handler on INT33FF:01 pin 0, causing spurious wakeups.
+ * When suspending by closing the LID, the power to the USB
+ * keyboard is turned off, causing INT0002 ACPI events to
+ * trigger once the XHCI controller notices the keyboard is
+ * gone. So INT0002 events cause spurious wakeups too. Ignoring
+ * EC wakes breaks wakeup when opening the lid, the user needs
+ * to press the power-button to wakeup the system. The
+ * alternative is suspend simply not working, which is worse.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "INT33FF:01@0,INT0002:00@2",
+ },
+ },
+ {
+ /*
+ * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
+ * external embedded-controller connected via I2C + an ACPI GPIO
+ * event handler on INT33FC:02 pin 28, causing spurious wakeups.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
+ DMI_MATCH(DMI_BOARD_NAME, "815D"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "INT33FC:02@28",
+ },
+ },
+ {
+ /*
+ * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
+ * external embedded-controller connected via I2C + an ACPI GPIO
+ * event handler on INT33FF:01 pin 0, causing spurious wakeups.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
+ DMI_MATCH(DMI_BOARD_NAME, "813E"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "INT33FF:01@0",
+ },
+ },
+ {
+ /*
+ * Interrupt storm caused from edge triggered floating pin
+ * Found in BIOS UX325UAZ.300
+ * https://bugzilla.kernel.org/show_bug.cgi?id=216208
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_interrupt = "AMDI0030:00@18",
+ },
+ },
+ {
+ /*
+ * Spurious wakeups from TP_ATTN# pin
+ * Found in BIOS 1.7.8
+ * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
+ */
+ .matches = {
+ DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "ELAN0415:00@9",
+ },
+ },
+ {
+ /*
+ * Spurious wakeups from TP_ATTN# pin
+ * Found in BIOS 1.7.8
+ * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
+ */
+ .matches = {
+ DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "ELAN0415:00@9",
+ },
+ },
+ {
+ /*
+ * Spurious wakeups from TP_ATTN# pin
+ * Found in BIOS 0.35
+ * https://gitlab.freedesktop.org/drm/amd/-/issues/3073
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "G1619-04"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_wake = "PNP0C50:00@8",
+ },
+ },
+ {} /* Terminating entry */
+};
+
+static int __init acpi_gpio_setup_params(void)
+{
+ const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
+ const struct dmi_system_id *id;
+
+ id = dmi_first_match(gpiolib_acpi_quirks);
+ if (id)
+ quirk = id->driver_data;
+
+ if (run_edge_events_on_boot < 0) {
+ if (quirk && quirk->no_edge_events_on_boot)
+ run_edge_events_on_boot = 0;
+ else
+ run_edge_events_on_boot = 1;
+ }
+
+ if (ignore_wake == NULL && quirk && quirk->ignore_wake)
+ ignore_wake = quirk->ignore_wake;
+
+ if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
+ ignore_interrupt = quirk->ignore_interrupt;
+
+ return 0;
+}
+
+/* Directly after dmi_setup() which runs as core_initcall() */
+postcore_initcall(acpi_gpio_setup_params);