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, 218 insertions, 0 deletions

diff --git a/drivers/uwb/umc-bus.c b/drivers/uwb/umc-bus.c
new file mode 100644
index 000000000000..2d8d62d9f53e
--- /dev/null
+++ b/drivers/uwb/umc-bus.c
@@ -0,0 +1,218 @@
+/*
+ * Bus for UWB Multi-interface Controller capabilities.
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ *
+ * This file is released under the GNU GPL v2.
+ */
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/workqueue.h>
+#include <linux/uwb/umc.h>
+#include <linux/pci.h>
+
+static int umc_bus_unbind_helper(struct device *dev, void *data)
+{
+        struct device *parent = data;
+
+        if (dev->parent == parent && dev->driver)
+                device_release_driver(dev);
+        return 0;
+}
+
+/**
+ * umc_controller_reset - reset the whole UMC controller
+ * @umc: the UMC device for the radio controller.
+ *
+ * Drivers will be unbound from all UMC devices belonging to the
+ * controller and then the radio controller will be rebound.  The
+ * radio controller is expected to do a full hardware reset when it is
+ * probed.
+ *
+ * If this is called while a probe() or remove() is in progress it
+ * will return -EAGAIN and not perform the reset.
+ */
+int umc_controller_reset(struct umc_dev *umc)
+{
+        struct device *parent = umc->dev.parent;
+        int ret;
+
+        if (down_trylock(&parent->sem))
+                return -EAGAIN;
+        bus_for_each_dev(&umc_bus_type, NULL, parent, umc_bus_unbind_helper);
+        ret = device_attach(&umc->dev);
+        if (ret == 1)
+                ret = 0;
+        up(&parent->sem);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(umc_controller_reset);
+
+/**
+ * umc_match_pci_id - match a UMC driver to a UMC device's parent PCI device.
+ * @umc_drv: umc driver with match_data pointing to a zero-terminated
+ * table of pci_device_id's.
+ * @umc: umc device whose parent is to be matched.
+ */
+int umc_match_pci_id(struct umc_driver *umc_drv, struct umc_dev *umc)
+{
+        const struct pci_device_id *id_table = umc_drv->match_data;
+        struct pci_dev *pci;
+
+        if (umc->dev.parent->bus != &pci_bus_type)
+                return 0;
+
+        pci = to_pci_dev(umc->dev.parent);
+        return pci_match_id(id_table, pci) != NULL;
+}
+EXPORT_SYMBOL_GPL(umc_match_pci_id);
+
+static int umc_bus_rescan_helper(struct device *dev, void *data)
+{
+        int ret = 0;
+
+        if (!dev->driver)
+                ret = device_attach(dev);
+
+        return ret < 0 ? ret : 0;
+}
+
+static void umc_bus_rescan(void)
+{
+        int err;
+
+        /*
+         * We can't use bus_rescan_devices() here as it deadlocks when
+         * it tries to retake the dev->parent semaphore.
+         */
+        err = bus_for_each_dev(&umc_bus_type, NULL, NULL, umc_bus_rescan_helper);
+        if (err < 0)
+                printk(KERN_WARNING "%s: rescan of bus failed: %d\n",
+                       KBUILD_MODNAME, err);
+}
+
+static int umc_bus_match(struct device *dev, struct device_driver *drv)
+{
+        struct umc_dev *umc = to_umc_dev(dev);
+        struct umc_driver *umc_driver = to_umc_driver(drv);
+
+        if (umc->cap_id == umc_driver->cap_id) {
+                if (umc_driver->match)
+                        return umc_driver->match(umc_driver, umc);
+                else
+                        return 1;
+        }
+        return 0;
+}
+
+static int umc_device_probe(struct device *dev)
+{
+        struct umc_dev *umc;
+        struct umc_driver *umc_driver;
+        int err;
+
+        umc_driver = to_umc_driver(dev->driver);
+        umc = to_umc_dev(dev);
+
+        get_device(dev);
+        err = umc_driver->probe(umc);
+        if (err)
+                put_device(dev);
+        else
+                umc_bus_rescan();
+
+        return err;
+}
+
+static int umc_device_remove(struct device *dev)
+{
+        struct umc_dev *umc;
+        struct umc_driver *umc_driver;
+
+        umc_driver = to_umc_driver(dev->driver);
+        umc = to_umc_dev(dev);
+
+        umc_driver->remove(umc);
+        put_device(dev);
+        return 0;
+}
+
+static int umc_device_suspend(struct device *dev, pm_message_t state)
+{
+        struct umc_dev *umc;
+        struct umc_driver *umc_driver;
+        int err = 0;
+
+        umc = to_umc_dev(dev);
+
+        if (dev->driver) {
+                umc_driver = to_umc_driver(dev->driver);
+                if (umc_driver->suspend)
+                        err = umc_driver->suspend(umc, state);
+        }
+        return err;
+}
+
+static int umc_device_resume(struct device *dev)
+{
+        struct umc_dev *umc;
+        struct umc_driver *umc_driver;
+        int err = 0;
+
+        umc = to_umc_dev(dev);
+
+        if (dev->driver) {
+                umc_driver = to_umc_driver(dev->driver);
+                if (umc_driver->resume)
+                        err = umc_driver->resume(umc);
+        }
+        return err;
+}
+
+static ssize_t capability_id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct umc_dev *umc = to_umc_dev(dev);
+
+        return sprintf(buf, "0x%02x\n", umc->cap_id);
+}
+
+static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct umc_dev *umc = to_umc_dev(dev);
+
+        return sprintf(buf, "0x%04x\n", umc->version);
+}
+
+static struct device_attribute umc_dev_attrs[] = {
+        __ATTR_RO(capability_id),
+        __ATTR_RO(version),
+        __ATTR_NULL,
+};
+
+struct bus_type umc_bus_type = {
+        .name           = "umc",
+        .match          = umc_bus_match,
+        .probe          = umc_device_probe,
+        .remove         = umc_device_remove,
+        .suspend        = umc_device_suspend,
+        .resume         = umc_device_resume,
+        .dev_attrs      = umc_dev_attrs,
+};
+EXPORT_SYMBOL_GPL(umc_bus_type);
+
+static int __init umc_bus_init(void)
+{
+        return bus_register(&umc_bus_type);
+}
+module_init(umc_bus_init);
+
+static void __exit umc_bus_exit(void)
+{
+        bus_unregister(&umc_bus_type);
+}
+module_exit(umc_bus_exit);
+
+MODULE_DESCRIPTION("UWB Multi-interface Controller capability bus");
+MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
+MODULE_LICENSE("GPL");