| /* |
| * 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> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/gpio.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 { |
| struct list_head node; |
| acpi_handle handle; |
| unsigned int pin; |
| unsigned int irq; |
| 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 event 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_interrupts() 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 acpi_status acpi_gpiochip_request_interrupt(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 long irqflags; |
| int ret, pin, irq, value; |
| |
| 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"); |
| if (IS_ERR(desc)) { |
| dev_err(chip->parent, "Failed to request GPIO\n"); |
| return AE_ERROR; |
| } |
| |
| gpiod_direction_input(desc); |
| |
| value = gpiod_get_value_cansleep(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; |
| } |
| |
| irqflags = IRQF_ONESHOT; |
| if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { |
| if (agpio->polarity == ACPI_ACTIVE_HIGH) |
| irqflags |= IRQF_TRIGGER_HIGH; |
| else |
| irqflags |= IRQF_TRIGGER_LOW; |
| } else { |
| switch (agpio->polarity) { |
| case ACPI_ACTIVE_HIGH: |
| irqflags |= IRQF_TRIGGER_RISING; |
| break; |
| case ACPI_ACTIVE_LOW: |
| irqflags |= IRQF_TRIGGER_FALLING; |
| break; |
| default: |
| irqflags |= IRQF_TRIGGER_RISING | |
| IRQF_TRIGGER_FALLING; |
| break; |
| } |
| } |
| |
| event = kzalloc(sizeof(*event), GFP_KERNEL); |
| if (!event) |
| goto fail_unlock_irq; |
| |
| event->handle = evt_handle; |
| event->irq = irq; |
| event->pin = pin; |
| event->desc = desc; |
| |
| ret = request_threaded_irq(event->irq, NULL, handler, irqflags, |
| "ACPI:Event", event); |
| if (ret) { |
| dev_err(chip->parent, |
| "Failed to setup interrupt handler for %d\n", |
| event->irq); |
| goto fail_free_event; |
| } |
| |
| if (agpio->wake_capable == ACPI_WAKE_CAPABLE) |
| enable_irq_wake(irq); |
| |
| list_add_tail(&event->node, &acpi_gpio->events); |
| |
| /* |
| * Make sure we trigger the initial state of the IRQ when using RISING |
| * or FALLING. Note we run the handlers on late_init, the AML code |
| * may refer to OperationRegions from other (builtin) drivers which |
| * may be probed after us. |
| */ |
| if (((irqflags & IRQF_TRIGGER_RISING) && value == 1) || |
| ((irqflags & IRQF_TRIGGER_FALLING) && value == 0)) |
| handler(event->irq, event); |
| |
| return AE_OK; |
| |
| fail_free_event: |
| kfree(event); |
| 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; |
| |
| 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_walk_resources(handle, "_AEI", |
| acpi_gpiochip_request_interrupt, 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) { |
| struct gpio_desc *desc; |
| |
| if (irqd_is_wakeup_set(irq_get_irq_data(event->irq))) |
| disable_irq_wake(event->irq); |
| |
| free_irq(event->irq, event); |
| desc = event->desc; |
| if (WARN_ON(IS_ERR(desc))) |
| continue; |
| gpiochip_unlock_as_irq(chip, event->pin); |
| gpiochip_free_own_desc(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"; |
| int err; |
| |
| desc = gpiochip_request_own_desc(chip, pin, label); |
| if (IS_ERR(desc)) { |
| status = AE_ERROR; |
| mutex_unlock(&achip->conn_lock); |
| goto out; |
| } |
| |
| err = gpiod_configure_flags(desc, label, 0, flags); |
| if (err < 0) { |
| status = AE_NOT_CONFIGURED; |
| gpiochip_free_own_desc(desc); |
| 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 (adev->data.properties || adev->driver_gpios) |
| return false; |
| |
| return con_id == NULL; |
| } |
| |
| /* Run deferred acpi_gpiochip_request_interrupts() */ |
| static int acpi_gpio_handle_deferred_request_interrupts(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_handle handle; |
| |
| handle = ACPI_HANDLE(acpi_gpio->chip->parent); |
| acpi_walk_resources(handle, "_AEI", |
| acpi_gpiochip_request_interrupt, acpi_gpio); |
| |
| list_del_init(&acpi_gpio->deferred_req_irqs_list_entry); |
| } |
| |
| 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_interrupts); |