--- /dev/null
+/*
+ * 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>
+ *
+ * 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/acpi.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+ACPI_MODULE_NAME("platform");
+
+struct resource_info {
+ struct device *dev;
+ struct resource *res;
+ size_t n, cur;
+};
+
+static acpi_status acpi_platform_count_resources(struct acpi_resource *res,
+ void *data)
+{
+ struct acpi_resource_extended_irq *acpi_xirq;
+ struct resource_info *ri = data;
+
+ switch (res->type) {
+ case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+ case ACPI_RESOURCE_TYPE_IRQ:
+ ri->n++;
+ break;
+ case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
+ acpi_xirq = &res->data.extended_irq;
+ ri->n += acpi_xirq->interrupt_count;
+ break;
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ if (res->data.address32.resource_type == ACPI_IO_RANGE)
+ ri->n++;
+ break;
+ }
+
+ return AE_OK;
+}
+
+static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
+ void *data)
+{
+ struct acpi_resource_fixed_memory32 *acpi_mem;
+ struct acpi_resource_address32 *acpi_add32;
+ struct acpi_resource_extended_irq *acpi_xirq;
+ struct acpi_resource_irq *acpi_irq;
+ struct resource_info *ri = data;
+ struct resource *r;
+ int irq, i;
+
+ switch (res->type) {
+ case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+ acpi_mem = &res->data.fixed_memory32;
+ r = &ri->res[ri->cur++];
+
+ r->start = acpi_mem->address;
+ r->end = r->start + acpi_mem->address_length - 1;
+ r->flags = IORESOURCE_MEM;
+
+ dev_dbg(ri->dev, "Memory32Fixed %pR\n", r);
+ break;
+
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ acpi_add32 = &res->data.address32;
+
+ if (acpi_add32->resource_type == ACPI_IO_RANGE) {
+ r = &ri->res[ri->cur++];
+ r->start = acpi_add32->minimum;
+ r->end = r->start + acpi_add32->address_length - 1;
+ r->flags = IORESOURCE_IO;
+ dev_dbg(ri->dev, "Address32 %pR\n", r);
+ }
+ break;
+
+ case ACPI_RESOURCE_TYPE_IRQ:
+ acpi_irq = &res->data.irq;
+ r = &ri->res[ri->cur++];
+
+ irq = acpi_register_gsi(ri->dev,
+ acpi_irq->interrupts[0],
+ acpi_irq->triggering,
+ acpi_irq->polarity);
+
+ r->start = r->end = irq;
+ r->flags = IORESOURCE_IRQ;
+
+ dev_dbg(ri->dev, "IRQ %pR\n", r);
+ break;
+
+ case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
+ acpi_xirq = &res->data.extended_irq;
+
+ for (i = 0; i < acpi_xirq->interrupt_count; i++, ri->cur++) {
+ r = &ri->res[ri->cur];
+ irq = acpi_register_gsi(ri->dev,
+ acpi_xirq->interrupts[i],
+ acpi_xirq->triggering,
+ acpi_xirq->polarity);
+
+ r->start = r->end = irq;
+ r->flags = IORESOURCE_IRQ;
+
+ dev_dbg(ri->dev, "Interrupt %pR\n", r);
+ }
+ break;
+ }
+
+ return AE_OK;
+}
+
+static acpi_status acpi_platform_get_device_uid(struct acpi_device *adev,
+ int *uid)
+{
+ struct acpi_device_info *info;
+ acpi_status status;
+
+ status = acpi_get_object_info(adev->handle, &info);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ status = AE_NOT_EXIST;
+ if ((info->valid & ACPI_VALID_UID) &&
+ !kstrtoint(info->unique_id.string, 0, uid))
+ status = AE_OK;
+
+ kfree(info);
+ return status;
+}
+
+/**
+ * acpi_create_platform_device - Create platform device for ACPI device node
+ * @adev: ACPI device node to create a platform device for.
+ *
+ * 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.
+ *
+ * The platform device's name will be taken from the @adev's _HID and _UID.
+ */
+struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
+{
+ struct platform_device *pdev = NULL;
+ struct acpi_device *acpi_parent;
+ struct device *parent = NULL;
+ struct resource_info ri;
+ acpi_status status;
+ int devid;
+
+ /* If the ACPI node already has a physical device attached, skip it. */
+ if (adev->physical_node_count)
+ return NULL;
+
+ /* Use the UID of the device as the new platform device id if found. */
+ status = acpi_platform_get_device_uid(adev, &devid);
+ if (ACPI_FAILURE(status))
+ devid = -1;
+
+ memset(&ri, 0, sizeof(ri));
+
+ /* First, count the resources. */
+ status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
+ acpi_platform_count_resources, &ri);
+ if (ACPI_FAILURE(status) || !ri.n)
+ return NULL;
+
+ /* Next, allocate memory for all the resources and populate it. */
+ ri.dev = &adev->dev;
+ ri.res = kzalloc(ri.n * sizeof(struct resource), GFP_KERNEL);
+ if (!ri.res) {
+ dev_err(&adev->dev,
+ "failed to allocate memory for resources\n");
+ return NULL;
+ }
+
+ status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
+ acpi_platform_add_resources, &ri);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&adev->dev, "failed to walk resources\n");
+ goto out;
+ }
+
+ if (WARN_ON(ri.n != ri.cur))
+ goto out;
+
+ /*
+ * 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.
+ */
+ acpi_parent = adev->parent;
+ if (acpi_parent) {
+ struct acpi_device_physical_node *entry;
+ struct list_head *list;
+
+ mutex_lock(&acpi_parent->physical_node_lock);
+ list = &acpi_parent->physical_node_list;
+ if (!list_empty(list)) {
+ entry = list_first_entry(list,
+ struct acpi_device_physical_node,
+ node);
+ parent = entry->dev;
+ }
+ mutex_unlock(&acpi_parent->physical_node_lock);
+ }
+ pdev = platform_device_register_resndata(parent, acpi_device_hid(adev),
+ devid, ri.res, ri.n, NULL, 0);
+ if (IS_ERR(pdev)) {
+ dev_err(&adev->dev, "platform device creation failed: %ld\n",
+ PTR_ERR(pdev));
+ pdev = NULL;
+ } else {
+ dev_dbg(&adev->dev, "created platform device %s\n",
+ dev_name(&pdev->dev));
+ }
+
+ out:
+ kfree(ri.res);
+ return pdev;
+}
+
+static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
+ void *data, void **return_value)
+{
+ struct platform_device *pdev = data;
+ struct acpi_device *adev;
+ acpi_status status;
+
+ status = acpi_bus_get_device(handle, &adev);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ /* Skip ACPI devices that have physical device attached */
+ if (adev->physical_node_count)
+ return AE_OK;
+
+ if (!strcmp(pdev->name, acpi_device_hid(adev))) {
+ int devid;
+
+ /* Check that both name and UID match if it exists */
+ status = acpi_platform_get_device_uid(adev, &devid);
+ if (ACPI_FAILURE(status))
+ devid = -1;
+
+ if (pdev->id != devid)
+ return AE_OK;
+
+ *(acpi_handle *)return_value = handle;
+ return AE_CTRL_TERMINATE;
+ }
+
+ return AE_OK;
+}
+
+static int acpi_platform_find_device(struct device *dev, acpi_handle *handle)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ *handle = NULL;
+ acpi_get_devices(pdev->name, acpi_platform_match, pdev, handle);
+
+ return *handle ? 0 : -ENODEV;
+}
+
+static struct acpi_bus_type acpi_platform_bus = {
+ .bus = &platform_bus_type,
+ .find_device = acpi_platform_find_device,
+};
+
+static int __init acpi_platform_init(void)
+{
+ return register_acpi_bus_type(&acpi_platform_bus);
+}
+arch_initcall(acpi_platform_init);
projects / openwrt / staging / blogic.git / commitdiff