diff options
Diffstat (limited to 'drivers/acpi/acpi_platform.c')
| -rw-r--r-- | drivers/acpi/acpi_platform.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c new file mode 100644 index 000000000..78d621290 --- /dev/null +++ b/drivers/acpi/acpi_platform.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ACPI support for platform bus type. + * + * Copyright (C) 2012, Intel Corporation + * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> + * Mathias Nyman <mathias.nyman@linux.intel.com> + * Rafael J. Wysocki <rafael.j.wysocki@intel.com> + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/pci.h> +#include <linux/platform_device.h> + +#include "internal.h" + +static const struct acpi_device_id forbidden_id_list[] = { + {"PNP0000", 0}, /* PIC */ + {"PNP0100", 0}, /* Timer */ + {"PNP0200", 0}, /* AT DMA Controller */ + {"ACPI0009", 0}, /* IOxAPIC */ + {"ACPI000A", 0}, /* IOAPIC */ + {"SMB0001", 0}, /* ACPI SMBUS virtual device */ + {"", 0}, +}; + +static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev) +{ + struct device *dev; + + dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev); + return dev ? to_platform_device(dev) : NULL; +} + +static int acpi_platform_device_remove_notify(struct notifier_block *nb, + unsigned long value, void *arg) +{ + struct acpi_device *adev = arg; + struct platform_device *pdev; + + switch (value) { + case ACPI_RECONFIG_DEVICE_ADD: + /* Nothing to do here */ + break; + case ACPI_RECONFIG_DEVICE_REMOVE: + if (!acpi_device_enumerated(adev)) + break; + + pdev = acpi_platform_device_find_by_companion(adev); + if (!pdev) + break; + + platform_device_unregister(pdev); + put_device(&pdev->dev); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block acpi_platform_notifier = { + .notifier_call = acpi_platform_device_remove_notify, +}; + +static void acpi_platform_fill_resource(struct acpi_device *adev, + const struct resource *src, struct resource *dest) +{ + struct device *parent; + + *dest = *src; + + /* + * If the device has parent we need to take its resources into + * account as well because this device might consume part of those. + */ + parent = acpi_get_first_physical_node(adev->parent); + if (parent && dev_is_pci(parent)) + dest->parent = pci_find_resource(to_pci_dev(parent), dest); +} + +/** + * acpi_create_platform_device - Create platform device for ACPI device node + * @adev: ACPI device node to create a platform device for. + * @properties: Optional collection of build-in properties. + * + * Check if the given @adev can be represented as a platform device and, if + * that's the case, create and register a platform device, populate its common + * resources and returns a pointer to it. Otherwise, return %NULL. + * + * Name of the platform device will be the same as @adev's. + */ +struct platform_device *acpi_create_platform_device(struct acpi_device *adev, + struct property_entry *properties) +{ + struct platform_device *pdev = NULL; + struct platform_device_info pdevinfo; + struct resource_entry *rentry; + struct list_head resource_list; + struct resource *resources = NULL; + int count; + + /* If the ACPI node already has a physical device attached, skip it. */ + if (adev->physical_node_count) + return NULL; + + if (!acpi_match_device_ids(adev, forbidden_id_list)) + return ERR_PTR(-EINVAL); + + INIT_LIST_HEAD(&resource_list); + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); + if (count < 0) { + return NULL; + } else if (count > 0) { + resources = kcalloc(count, sizeof(struct resource), + GFP_KERNEL); + if (!resources) { + dev_err(&adev->dev, "No memory for resources\n"); + acpi_dev_free_resource_list(&resource_list); + return ERR_PTR(-ENOMEM); + } + count = 0; + list_for_each_entry(rentry, &resource_list, node) + acpi_platform_fill_resource(adev, rentry->res, + &resources[count++]); + + acpi_dev_free_resource_list(&resource_list); + } + + memset(&pdevinfo, 0, sizeof(pdevinfo)); + /* + * If the ACPI node has a parent and that parent has a physical device + * attached to it, that physical device should be the parent of the + * platform device we are about to create. + */ + pdevinfo.parent = adev->parent ? + acpi_get_first_physical_node(adev->parent) : NULL; + pdevinfo.name = dev_name(&adev->dev); + pdevinfo.id = -1; + pdevinfo.res = resources; + pdevinfo.num_res = count; + pdevinfo.fwnode = acpi_fwnode_handle(adev); + pdevinfo.properties = properties; + + if (acpi_dma_supported(adev)) + pdevinfo.dma_mask = DMA_BIT_MASK(32); + else + pdevinfo.dma_mask = 0; + + pdev = platform_device_register_full(&pdevinfo); + if (IS_ERR(pdev)) + dev_err(&adev->dev, "platform device creation failed: %ld\n", + PTR_ERR(pdev)); + else { + set_dev_node(&pdev->dev, acpi_get_node(adev->handle)); + dev_dbg(&adev->dev, "created platform device %s\n", + dev_name(&pdev->dev)); + } + + kfree(resources); + + return pdev; +} +EXPORT_SYMBOL_GPL(acpi_create_platform_device); + +void __init acpi_platform_init(void) +{ + acpi_reconfig_notifier_register(&acpi_platform_notifier); +} |