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