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>

1 files changed, 104 insertions, 0 deletions

diff --git a/drivers/uwb/umc-dev.c b/drivers/uwb/umc-dev.c
new file mode 100644
index 000000000000..aa44e1c1a102
--- /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);