Subject: [PATCH] [acpi driver model] Add helper for finding _CRS resources

- Create include/acpi/resource.h and define the struct
  walk_resource structure, which describes a resource to
  search for.

- Create drivers/acpi/drivers/core/resource.c and implement
  a wrapper for acpi_walk_resources() that provides its own
  callback, filtering the resources to the ones specified by
  the caller, and calling a simpler callback (also provided by
  the caller).

Signed-off-by: Patrick Mochel <mochel@linux.intel.com>

---

 drivers/acpi/drivers/core/Makefile   |    2 +-
 drivers/acpi/drivers/core/resource.c |   31 +++++++++++++++++++++++++++++
 include/acpi/resource.h              |   36 ++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 1 deletions(-)
 create mode 100644 drivers/acpi/drivers/core/resource.c
 create mode 100644 include/acpi/resource.h

applies-to: d5b97ca0b911952389a32190af968f287c5c1705
6a7368860e36b77a0421374a783ff4b4b7d7aa0b
diff --git a/drivers/acpi/drivers/core/Makefile b/drivers/acpi/drivers/core/Makefile
index caed047..562903a 100644
--- a/drivers/acpi/drivers/core/Makefile
+++ b/drivers/acpi/drivers/core/Makefile
@@ -1,6 +1,6 @@
 
 obj-y	:=	bus.o device.o driver.o event.o
-obj-y	+=	lib.o
+obj-y	+=	lib.o resource.o
 
 obj-$(CONFIG_ACPI_DM_SYSFS)	+=	sysfs.o
 obj-$(CONFIG_ACPI_DM_SYSFS)	+=	proc.o
diff --git a/drivers/acpi/drivers/core/resource.c b/drivers/acpi/drivers/core/resource.c
new file mode 100644
index 0000000..ad37f8c
--- /dev/null
+++ b/drivers/acpi/drivers/core/resource.c
@@ -0,0 +1,31 @@
+
+#include <acpi/acpi_drivers.h>
+#include <acpi/resource.h>
+
+static acpi_status walk_callback(struct acpi_resource * r, void * context)
+{
+	struct walk_resource * w = context;
+	int i;
+	
+	for (i = 0; i < w->num_rstypes; i++) {
+		if (w->rstypes[i] == r->id) {
+			int ret;
+
+			w->resource = r;
+			ret = w->func(w);
+			return ret == 0 ? AE_OK : AE_CTRL_TERMINATE;
+		}
+	}
+	return AE_OK;
+}
+
+
+int acpi_dev_find_crs(struct walk_resource * w)
+{
+	acpi_status status;
+
+	status = acpi_walk_resources(w->handle, METHOD_NAME__CRS, walk_callback, w);
+	return ACPI_SUCCESS(status) ? 0 : -ENODEV;
+}
+
+EXPORT_SYMBOL_GPL(acpi_dev_find_crs);
diff --git a/include/acpi/resource.h b/include/acpi/resource.h
new file mode 100644
index 0000000..06c8709
--- /dev/null
+++ b/include/acpi/resource.h
@@ -0,0 +1,36 @@
+#include <acpi/actypes.h>
+
+
+/*
+ * ACPI_RESOURCE_TYPEs (from <acpi/actypes.h>
+
+ #define ACPI_RSTYPE_IRQ                 0
+ #define ACPI_RSTYPE_DMA                 1
+ #define ACPI_RSTYPE_START_DPF           2
+ #define ACPI_RSTYPE_END_DPF             3
+ #define ACPI_RSTYPE_IO                  4
+ #define ACPI_RSTYPE_FIXED_IO            5
+ #define ACPI_RSTYPE_VENDOR              6
+ #define ACPI_RSTYPE_END_TAG             7
+ #define ACPI_RSTYPE_MEM24               8
+ #define ACPI_RSTYPE_MEM32               9
+ #define ACPI_RSTYPE_FIXED_MEM32         10
+ #define ACPI_RSTYPE_ADDRESS16           11
+ #define ACPI_RSTYPE_ADDRESS32           12
+ #define ACPI_RSTYPE_ADDRESS64           13
+ #define ACPI_RSTYPE_EXT_IRQ             14
+*/
+
+#define ACPI_NUM_RESOURCES	15
+
+struct walk_resource {
+	acpi_handle		handle;
+	u32			rstypes[ACPI_NUM_RESOURCES];
+	u32			num_rstypes;
+	int			(*func)(struct walk_resource *);
+	void			* data;
+
+	struct acpi_resource	* resource;
+};
+
+extern int acpi_dev_find_crs(struct walk_resource * w);
---
0.99.9.GIT