summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpi_platform.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/acpi/acpi_platform.c
Initial import
Diffstat (limited to 'drivers/acpi/acpi_platform.c')
-rw-r--r--drivers/acpi/acpi_platform.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
new file mode 100644
index 000000000..4bf75597f
--- /dev/null
+++ b/drivers/acpi/acpi_platform.c
@@ -0,0 +1,118 @@
+/*
+ * 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/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+
+#include "internal.h"
+
+ACPI_MODULE_NAME("platform");
+
+static const struct acpi_device_id forbidden_id_list[] = {
+ {"PNP0000", 0}, /* PIC */
+ {"PNP0100", 0}, /* Timer */
+ {"PNP0200", 0}, /* AT DMA Controller */
+ {"", 0},
+};
+
+/**
+ * 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.
+ *
+ * Name of the platform device will be the same as @adev's.
+ */
+struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
+{
+ struct platform_device *pdev = NULL;
+ struct acpi_device *acpi_parent;
+ 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 = kmalloc(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)
+ resources[count++] = *rentry->res;
+
+ 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 = NULL;
+ 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);
+ pdevinfo.parent = entry->dev;
+ }
+ mutex_unlock(&acpi_parent->physical_node_lock);
+ }
+ pdevinfo.name = dev_name(&adev->dev);
+ pdevinfo.id = -1;
+ pdevinfo.res = resources;
+ pdevinfo.num_res = count;
+ pdevinfo.fwnode = acpi_fwnode_handle(adev);
+ pdevinfo.dma_mask = DMA_BIT_MASK(32);
+ pdev = platform_device_register_full(&pdevinfo);
+ if (IS_ERR(pdev))
+ dev_err(&adev->dev, "platform device creation failed: %ld\n",
+ PTR_ERR(pdev));
+ else
+ dev_dbg(&adev->dev, "created platform device %s\n",
+ dev_name(&pdev->dev));
+
+ kfree(resources);
+ return pdev;
+}
+EXPORT_SYMBOL_GPL(acpi_create_platform_device);