diff options
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 1238 |
1 files changed, 0 insertions, 1238 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c deleted file mode 100644 index 259cf6ab969b..000000000000 --- a/drivers/gpio/gpiolib-acpi.c +++ /dev/null @@ -1,1238 +0,0 @@ -// 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/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" - -/** - * 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: irq_handler to pass to request_irq when requesting the IRQ - * @pin: GPIO pin number on the gpio_chip - * @irq: Linux IRQ number for the event, for request_ / 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 - * @is_requested: True if request_irq has been done - * @desc: 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 gpiochips 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 gpiochips - * 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) -{ - if (!gc->parent) - return false; - - return 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 gpiochip registered at the moment. This is to - * support probe deferral. - */ -static struct gpio_desc *acpi_get_gpiod(char *path, 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); -} - -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); - -static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio, - struct acpi_gpio_event *event) -{ - int ret, value; - - ret = request_threaded_irq(event->irq, NULL, event->handler, - event->irqflags, "ACPI:Event", event); - if (ret) { - dev_err(acpi_gpio->chip->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 */ - 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 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; - int ret, pin, 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[5]; - sprintf(ev_name, "_%c%02hhX", - 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 = gpiochip_request_own_desc(chip, pin, "ACPI:Event", 0); - if (IS_ERR(desc)) { - dev_err(chip->parent, "Failed to request GPIO\n"); - return AE_ERROR; - } - - gpiod_direction_input(desc); - - ret = gpiochip_lock_as_irq(chip, pin); - if (ret) { - dev_err(chip->parent, "Failed to lock GPIO as interrupt\n"); - goto fail_free_desc; - } - - irq = gpiod_to_irq(desc); - if (irq < 0) { - dev_err(chip->parent, "Failed to translate GPIO to IRQ\n"); - goto fail_unlock_irq; - } - - 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 = agpio->wake_capable == ACPI_WAKE_CAPABLE; - 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_ERROR; -} - -/** - * 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); - -static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res) -{ - acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev)); -} - -int devm_acpi_dev_add_driver_gpios(struct device *dev, - const struct acpi_gpio_mapping *gpios) -{ - void *res; - int ret; - - res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL); - if (!res) - return -ENOMEM; - - ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios); - if (ret) { - devres_free(res); - return ret; - } - devres_add(dev, res); - return 0; -} -EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios); - -void devm_acpi_dev_remove_driver_gpios(struct device *dev) -{ - WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL)); -} -EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_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 enum gpiod_flags -acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) -{ - bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP; - - 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 - * instead. If the pin is pulled up we assume default to be - * high, otherwise low. - */ - return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; - default: - /* - * Assume that the BIOS has configured the direction and pull - * accordingly. - */ - return GPIOD_ASIS; - } -} - -static int -__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) -{ - 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 = update; - } - 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; -} - -struct acpi_gpio_lookup { - struct acpi_gpio_info info; - int index; - int 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->n++ == lookup->index && !lookup->desc) { - const struct acpi_resource_gpio *agpio = &ares->data.gpio; - int pin_index = lookup->pin_index; - - if (pin_index >= agpio->pin_table_length) - return 1; - - lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, - agpio->pin_table[pin_index]); - lookup->info.gpioint = - agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; - - /* - * 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.flags = GPIOD_IN; - lookup->info.polarity = agpio->polarity; - lookup->info.triggering = agpio->triggering; - } else { - lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio); - lookup->info.polarity = lookup->active_low; - } - } - - 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 %d %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; -} - -struct gpio_desc *acpi_find_gpio(struct device *dev, - const char *con_id, - unsigned int idx, - enum gpiod_flags *dflags, - enum gpio_lookup_flags *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(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); - return ERR_PTR(-ENOENT); - } - - if (info.polarity == GPIO_ACTIVE_LOW) - *lookupflags |= GPIO_ACTIVE_LOW; - - acpi_gpio_update_gpiod_flags(dflags, &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 (ie. 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. - */ -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_get() - Find GpioInt and translate it to Linux IRQ number - * @adev: pointer to a ACPI device to get IRQ from - * @index: index of GpioInt resource (starting from %0) - * - * 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. - * - * Return: Linux IRQ number (> %0) on success, negative errno on failure. - */ -int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) -{ - 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, NULL, 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) { - char label[32]; - int irq; - - if (IS_ERR(desc)) - return PTR_ERR(desc); - - irq = gpiod_to_irq(desc); - if (irq < 0) - return irq; - - snprintf(label, sizeof(label), "GpioInt() %d", index); - ret = gpiod_configure_flags(desc, label, 0, info.flags); - if (ret < 0) - return ret; - - irq_flags = acpi_dev_get_irq_type(info.triggering, - info.polarity); - - /* Set type if specified and different than the current one */ - if (irq_flags != IRQ_TYPE_NONE && - irq_flags != irq_get_trigger_type(irq)) - irq_set_irq_type(irq, irq_flags); - - return irq; - } - - } - return -ENOENT; -} -EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get); - -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; - int pin_index = (int)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(agpio->pin_table_length, (u16)(pin_index + bits)); - for (i = pin_index; i < length; ++i) { - 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->sharable == 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) { - enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio); - const char *label = "ACPI:OpRegion"; - - desc = gpiochip_request_own_desc(chip, pin, label, - flags); - if (IS_ERR(desc)) { - status = AE_ERROR; - mutex_unlock(&achip->conn_lock); - goto out; - } - - conn = kzalloc(sizeof(*conn), GFP_KERNEL); - if (!conn) { - status = AE_NO_MEMORY; - gpiochip_free_own_desc(desc); - mutex_unlock(&achip->conn_lock); - 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, - !!((1 << i) & *value)); - 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 int *lflags, unsigned int *dflags) -{ - struct gpio_chip *chip = achip->chip; - struct gpio_desc *desc; - u32 gpios[2]; - int ret; - - *lflags = 0; - *dflags = 0; - *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 int lflags, 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; - acpi_handle handle; - acpi_status status; - - if (!chip || !chip->parent) - return; - - handle = ACPI_HANDLE(chip->parent); - if (!handle) - 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(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; - } - - if (!chip->names) - devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent)); - - acpi_gpiochip_request_regions(acpi_gpio); - acpi_gpiochip_scan_gpios(acpi_gpio); - acpi_walk_dep_device_list(handle); -} - -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); -} - -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 - return the number of GPIOs associated with a - * device / function or -ENOENT if no GPIO has been - * assigned to the requested function. - * @dev: GPIO consumer, can be NULL for system-global GPIOs - * @con_id: function within the GPIO consumer - */ -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; -} - -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; -} - -/* Run deferred acpi_gpiochip_request_irqs() */ -static int 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); |