1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
new file mode 100644
index 00000000000..a5a23462287
--- /dev/null
+++ b/drivers/acpi/acpi_platform.c
@@ -0,0 +1,285 @@
+/*
+ * 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);