uwb: add the umc bus
The UMC bus is used for the capabilities exposed by a UWB Multi-interface
Controller as described in the WHCI specification.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
diff --git a/drivers/uwb/umc-dev.c b/drivers/uwb/umc-dev.c
new file mode 100644
index 0000000..aa44e1c
--- /dev/null
+++ b/drivers/uwb/umc-dev.c
@@ -0,0 +1,104 @@
+/*
+ * UWB Multi-interface Controller device management.
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ *
+ * This file is released under the GNU GPL v2.
+ */
+#include <linux/kernel.h>
+#include <linux/uwb/umc.h>
+#define D_LOCAL 0
+#include <linux/uwb/debug.h>
+
+static void umc_device_release(struct device *dev)
+{
+ struct umc_dev *umc = to_umc_dev(dev);
+
+ kfree(umc);
+}
+
+/**
+ * umc_device_create - allocate a child UMC device
+ * @parent: parent of the new UMC device.
+ * @n: index of the new device.
+ *
+ * The new UMC device will have a bus ID of the parent with '-n'
+ * appended.
+ */
+struct umc_dev *umc_device_create(struct device *parent, int n)
+{
+ struct umc_dev *umc;
+
+ umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
+ if (umc) {
+ snprintf(umc->dev.bus_id, sizeof(umc->dev.bus_id), "%s-%d",
+ parent->bus_id, n);
+ umc->dev.parent = parent;
+ umc->dev.bus = &umc_bus_type;
+ umc->dev.release = umc_device_release;
+
+ umc->dev.dma_mask = parent->dma_mask;
+ }
+ return umc;
+}
+EXPORT_SYMBOL_GPL(umc_device_create);
+
+/**
+ * umc_device_register - register a UMC device
+ * @umc: pointer to the UMC device
+ *
+ * The memory resource for the UMC device is acquired and the device
+ * registered with the system.
+ */
+int umc_device_register(struct umc_dev *umc)
+{
+ int err;
+
+ d_fnstart(3, &umc->dev, "(umc_dev %p)\n", umc);
+
+ err = request_resource(umc->resource.parent, &umc->resource);
+ if (err < 0) {
+ dev_err(&umc->dev, "can't allocate resource range "
+ "%016Lx to %016Lx: %d\n",
+ (unsigned long long)umc->resource.start,
+ (unsigned long long)umc->resource.end,
+ err);
+ goto error_request_resource;
+ }
+
+ err = device_register(&umc->dev);
+ if (err < 0)
+ goto error_device_register;
+ d_fnend(3, &umc->dev, "(umc_dev %p) = 0\n", umc);
+ return 0;
+
+error_device_register:
+ release_resource(&umc->resource);
+error_request_resource:
+ d_fnend(3, &umc->dev, "(umc_dev %p) = %d\n", umc, err);
+ return err;
+}
+EXPORT_SYMBOL_GPL(umc_device_register);
+
+/**
+ * umc_device_unregister - unregister a UMC device
+ * @umc: pointer to the UMC device
+ *
+ * First we unregister the device, make sure the driver can do it's
+ * resource release thing and then we try to release any left over
+ * resources. We take a ref to the device, to make sure it doesn't
+ * dissapear under our feet.
+ */
+void umc_device_unregister(struct umc_dev *umc)
+{
+ struct device *dev;
+ if (!umc)
+ return;
+ dev = get_device(&umc->dev);
+ d_fnstart(3, dev, "(umc_dev %p)\n", umc);
+ device_unregister(&umc->dev);
+ release_resource(&umc->resource);
+ d_fnend(3, dev, "(umc_dev %p) = void\n", umc);
+ put_device(dev);
+}
+EXPORT_SYMBOL_GPL(umc_device_unregister);