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Diffstat (limited to 'drivers/acpi/acpi_platform.c')
-rw-r--r--drivers/acpi/acpi_platform.c72
1 files changed, 66 insertions, 6 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index db129b9f52cb..26fce4b8a632 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -13,6 +13,7 @@
#include <linux/acpi.h>
#include <linux/device.h>
+#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -21,18 +22,59 @@
ACPI_MODULE_NAME("platform");
+/* Flags for acpi_create_platform_device */
+#define ACPI_PLATFORM_CLK BIT(0)
+
+/*
+ * The following ACPI IDs are known to be suitable for representing as
+ * platform devices.
+ */
+static const struct acpi_device_id acpi_platform_device_ids[] = {
+
+ { "PNP0D40" },
+
+ /* Haswell LPSS devices */
+ { "INT33C0", ACPI_PLATFORM_CLK },
+ { "INT33C1", ACPI_PLATFORM_CLK },
+ { "INT33C2", ACPI_PLATFORM_CLK },
+ { "INT33C3", ACPI_PLATFORM_CLK },
+ { "INT33C4", ACPI_PLATFORM_CLK },
+ { "INT33C5", ACPI_PLATFORM_CLK },
+ { "INT33C6", ACPI_PLATFORM_CLK },
+ { "INT33C7", ACPI_PLATFORM_CLK },
+
+ { }
+};
+
+static int acpi_create_platform_clks(struct acpi_device *adev)
+{
+ static struct platform_device *pdev;
+
+ /* Create Lynxpoint LPSS clocks */
+ if (!pdev && !strncmp(acpi_device_hid(adev), "INT33C", 6)) {
+ pdev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+ }
+
+ return 0;
+}
+
/**
* acpi_create_platform_device - Create platform device for ACPI device node
* @adev: ACPI device node to create a platform device for.
+ * @id: ACPI device ID used to match @adev.
*
* 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.
+ * Name of the platform device will be the same as @adev's.
*/
-struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
+static int acpi_create_platform_device(struct acpi_device *adev,
+ const struct acpi_device_id *id)
{
+ unsigned long flags = id->driver_data;
struct platform_device *pdev = NULL;
struct acpi_device *acpi_parent;
struct platform_device_info pdevinfo;
@@ -41,20 +83,28 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
struct resource *resources;
int count;
+ if (flags & ACPI_PLATFORM_CLK) {
+ int ret = acpi_create_platform_clks(adev);
+ if (ret) {
+ dev_err(&adev->dev, "failed to create clocks\n");
+ return ret;
+ }
+ }
+
/* If the ACPI node already has a physical device attached, skip it. */
if (adev->physical_node_count)
- return NULL;
+ return 0;
INIT_LIST_HEAD(&resource_list);
count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
if (count <= 0)
- return NULL;
+ return 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 NULL;
+ return -ENOMEM;
}
count = 0;
list_for_each_entry(rentry, &resource_list, node)
@@ -100,5 +150,15 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
}
kfree(resources);
- return pdev;
+ return 1;
+}
+
+static struct acpi_scan_handler platform_handler = {
+ .ids = acpi_platform_device_ids,
+ .attach = acpi_create_platform_device,
+};
+
+void __init acpi_platform_init(void)
+{
+ acpi_scan_add_handler(&platform_handler);
}