![Jörn Engel](/assets/img/avatar_default.png)
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
472 lines
14 KiB
C
472 lines
14 KiB
C
/*
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* drivers/usb/driver.c - most of the driver model stuff for usb
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*
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* (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* based on drivers/usb/usb.c which had the following copyrights:
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* (C) Copyright Linus Torvalds 1999
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* (C) Copyright Johannes Erdfelt 1999-2001
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* (C) Copyright Andreas Gal 1999
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* (C) Copyright Gregory P. Smith 1999
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* (C) Copyright Deti Fliegl 1999 (new USB architecture)
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* (C) Copyright Randy Dunlap 2000
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* (C) Copyright David Brownell 2000-2004
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* (C) Copyright Yggdrasil Computing, Inc. 2000
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* (usb_device_id matching changes by Adam J. Richter)
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* (C) Copyright Greg Kroah-Hartman 2002-2003
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*
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* NOTE! This is not actually a driver at all, rather this is
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* just a collection of helper routines that implement the
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* generic USB things that the real drivers can use..
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*
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*/
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#include <linux/device.h>
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#include <linux/usb.h>
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#include "hcd.h"
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#include "usb.h"
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static int usb_match_one_id(struct usb_interface *interface,
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const struct usb_device_id *id);
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struct usb_dynid {
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struct list_head node;
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struct usb_device_id id;
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};
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static int generic_probe(struct device *dev)
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{
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return 0;
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}
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static int generic_remove(struct device *dev)
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{
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struct usb_device *udev = to_usb_device(dev);
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/* if this is only an unbind, not a physical disconnect, then
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* unconfigure the device */
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if (udev->state == USB_STATE_CONFIGURED)
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usb_set_configuration(udev, 0);
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/* in case the call failed or the device was suspended */
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if (udev->state >= USB_STATE_CONFIGURED)
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usb_disable_device(udev, 0);
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return 0;
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}
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struct device_driver usb_generic_driver = {
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.owner = THIS_MODULE,
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.name = "usb",
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.bus = &usb_bus_type,
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.probe = generic_probe,
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.remove = generic_remove,
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};
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/* Fun hack to determine if the struct device is a
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* usb device or a usb interface. */
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int usb_generic_driver_data;
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#ifdef CONFIG_HOTPLUG
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/*
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* Adds a new dynamic USBdevice ID to this driver,
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* and cause the driver to probe for all devices again.
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*/
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static ssize_t store_new_id(struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct usb_driver *usb_drv = to_usb_driver(driver);
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struct usb_dynid *dynid;
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u32 idVendor = 0;
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u32 idProduct = 0;
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int fields = 0;
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fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
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if (fields < 2)
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return -EINVAL;
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dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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if (!dynid)
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return -ENOMEM;
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INIT_LIST_HEAD(&dynid->node);
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dynid->id.idVendor = idVendor;
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dynid->id.idProduct = idProduct;
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dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
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spin_lock(&usb_drv->dynids.lock);
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list_add_tail(&usb_drv->dynids.list, &dynid->node);
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spin_unlock(&usb_drv->dynids.lock);
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if (get_driver(driver)) {
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driver_attach(driver);
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put_driver(driver);
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}
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return count;
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}
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static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
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static int usb_create_newid_file(struct usb_driver *usb_drv)
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{
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int error = 0;
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if (usb_drv->no_dynamic_id)
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goto exit;
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if (usb_drv->probe != NULL)
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error = sysfs_create_file(&usb_drv->driver.kobj,
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&driver_attr_new_id.attr);
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exit:
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return error;
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}
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static void usb_remove_newid_file(struct usb_driver *usb_drv)
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{
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if (usb_drv->no_dynamic_id)
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return;
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if (usb_drv->probe != NULL)
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sysfs_remove_file(&usb_drv->driver.kobj,
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&driver_attr_new_id.attr);
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}
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static void usb_free_dynids(struct usb_driver *usb_drv)
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{
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struct usb_dynid *dynid, *n;
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spin_lock(&usb_drv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
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list_del(&dynid->node);
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kfree(dynid);
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}
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spin_unlock(&usb_drv->dynids.lock);
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}
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#else
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static inline int usb_create_newid_file(struct usb_driver *usb_drv)
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{
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return 0;
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}
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static void usb_remove_newid_file(struct usb_driver *usb_drv)
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{
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}
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static inline void usb_free_dynids(struct usb_driver *usb_drv)
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{
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}
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#endif
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static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
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struct usb_driver *drv)
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{
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struct usb_dynid *dynid;
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spin_lock(&drv->dynids.lock);
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list_for_each_entry(dynid, &drv->dynids.list, node) {
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if (usb_match_one_id(intf, &dynid->id)) {
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spin_unlock(&drv->dynids.lock);
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return &dynid->id;
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}
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}
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spin_unlock(&drv->dynids.lock);
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return NULL;
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}
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/* called from driver core with usb_bus_type.subsys writelock */
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static int usb_probe_interface(struct device *dev)
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{
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struct usb_interface * intf = to_usb_interface(dev);
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struct usb_driver * driver = to_usb_driver(dev->driver);
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const struct usb_device_id *id;
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int error = -ENODEV;
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dev_dbg(dev, "%s\n", __FUNCTION__);
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if (!driver->probe)
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return error;
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/* FIXME we'd much prefer to just resume it ... */
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if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED)
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return -EHOSTUNREACH;
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id = usb_match_id(intf, driver->id_table);
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if (!id)
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id = usb_match_dynamic_id(intf, driver);
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if (id) {
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dev_dbg(dev, "%s - got id\n", __FUNCTION__);
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/* Interface "power state" doesn't correspond to any hardware
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* state whatsoever. We use it to record when it's bound to
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* a driver that may start I/0: it's not frozen/quiesced.
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*/
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mark_active(intf);
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intf->condition = USB_INTERFACE_BINDING;
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error = driver->probe(intf, id);
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if (error) {
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mark_quiesced(intf);
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intf->condition = USB_INTERFACE_UNBOUND;
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} else
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intf->condition = USB_INTERFACE_BOUND;
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}
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return error;
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}
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/* called from driver core with usb_bus_type.subsys writelock */
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static int usb_unbind_interface(struct device *dev)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_driver *driver = to_usb_driver(intf->dev.driver);
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intf->condition = USB_INTERFACE_UNBINDING;
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/* release all urbs for this interface */
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usb_disable_interface(interface_to_usbdev(intf), intf);
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if (driver && driver->disconnect)
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driver->disconnect(intf);
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/* reset other interface state */
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usb_set_interface(interface_to_usbdev(intf),
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intf->altsetting[0].desc.bInterfaceNumber,
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0);
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usb_set_intfdata(intf, NULL);
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intf->condition = USB_INTERFACE_UNBOUND;
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mark_quiesced(intf);
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return 0;
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}
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/* returns 0 if no match, 1 if match */
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static int usb_match_one_id(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct usb_host_interface *intf;
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struct usb_device *dev;
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/* proc_connectinfo in devio.c may call us with id == NULL. */
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if (id == NULL)
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return 0;
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intf = interface->cur_altsetting;
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dev = interface_to_usbdev(interface);
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if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
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id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
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id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
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return 0;
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/* No need to test id->bcdDevice_lo != 0, since 0 is never
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greater than any unsigned number. */
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
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(id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
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(id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
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(id->bDeviceClass != dev->descriptor.bDeviceClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
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(id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
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(id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
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(id->bInterfaceClass != intf->desc.bInterfaceClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
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(id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
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(id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
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return 0;
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return 1;
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}
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/**
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* usb_match_id - find first usb_device_id matching device or interface
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* @interface: the interface of interest
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* @id: array of usb_device_id structures, terminated by zero entry
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*
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* usb_match_id searches an array of usb_device_id's and returns
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* the first one matching the device or interface, or null.
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* This is used when binding (or rebinding) a driver to an interface.
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* Most USB device drivers will use this indirectly, through the usb core,
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* but some layered driver frameworks use it directly.
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* These device tables are exported with MODULE_DEVICE_TABLE, through
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* modutils, to support the driver loading functionality of USB hotplugging.
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*
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* What Matches:
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*
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* The "match_flags" element in a usb_device_id controls which
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* members are used. If the corresponding bit is set, the
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* value in the device_id must match its corresponding member
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* in the device or interface descriptor, or else the device_id
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* does not match.
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*
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* "driver_info" is normally used only by device drivers,
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* but you can create a wildcard "matches anything" usb_device_id
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* as a driver's "modules.usbmap" entry if you provide an id with
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* only a nonzero "driver_info" field. If you do this, the USB device
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* driver's probe() routine should use additional intelligence to
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* decide whether to bind to the specified interface.
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*
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* What Makes Good usb_device_id Tables:
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*
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* The match algorithm is very simple, so that intelligence in
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* driver selection must come from smart driver id records.
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* Unless you have good reasons to use another selection policy,
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* provide match elements only in related groups, and order match
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* specifiers from specific to general. Use the macros provided
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* for that purpose if you can.
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*
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* The most specific match specifiers use device descriptor
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* data. These are commonly used with product-specific matches;
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* the USB_DEVICE macro lets you provide vendor and product IDs,
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* and you can also match against ranges of product revisions.
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* These are widely used for devices with application or vendor
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* specific bDeviceClass values.
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*
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* Matches based on device class/subclass/protocol specifications
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* are slightly more general; use the USB_DEVICE_INFO macro, or
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* its siblings. These are used with single-function devices
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* where bDeviceClass doesn't specify that each interface has
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* its own class.
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*
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* Matches based on interface class/subclass/protocol are the
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* most general; they let drivers bind to any interface on a
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* multiple-function device. Use the USB_INTERFACE_INFO
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* macro, or its siblings, to match class-per-interface style
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* devices (as recorded in bDeviceClass).
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*
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* Within those groups, remember that not all combinations are
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* meaningful. For example, don't give a product version range
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* without vendor and product IDs; or specify a protocol without
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* its associated class and subclass.
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*/
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const struct usb_device_id *usb_match_id(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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/* proc_connectinfo in devio.c may call us with id == NULL. */
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if (id == NULL)
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return NULL;
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/* It is important to check that id->driver_info is nonzero,
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since an entry that is all zeroes except for a nonzero
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id->driver_info is the way to create an entry that
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indicates that the driver want to examine every
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device and interface. */
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for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
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id->driver_info; id++) {
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if (usb_match_one_id(interface, id))
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return id;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL_FUTURE(usb_match_id);
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int usb_device_match(struct device *dev, struct device_driver *drv)
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{
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struct usb_interface *intf;
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struct usb_driver *usb_drv;
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const struct usb_device_id *id;
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/* check for generic driver, which we don't match any device with */
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if (drv == &usb_generic_driver)
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return 0;
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intf = to_usb_interface(dev);
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usb_drv = to_usb_driver(drv);
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id = usb_match_id(intf, usb_drv->id_table);
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if (id)
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return 1;
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id = usb_match_dynamic_id(intf, usb_drv);
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if (id)
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return 1;
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return 0;
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}
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/**
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* usb_register_driver - register a USB driver
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* @new_driver: USB operations for the driver
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* @owner: module owner of this driver.
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*
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* Registers a USB driver with the USB core. The list of unattached
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* interfaces will be rescanned whenever a new driver is added, allowing
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* the new driver to attach to any recognized devices.
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* Returns a negative error code on failure and 0 on success.
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*
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* NOTE: if you want your driver to use the USB major number, you must call
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* usb_register_dev() to enable that functionality. This function no longer
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* takes care of that.
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*/
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int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
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{
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int retval = 0;
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if (usb_disabled())
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return -ENODEV;
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new_driver->driver.name = (char *)new_driver->name;
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new_driver->driver.bus = &usb_bus_type;
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new_driver->driver.probe = usb_probe_interface;
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new_driver->driver.remove = usb_unbind_interface;
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new_driver->driver.owner = owner;
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spin_lock_init(&new_driver->dynids.lock);
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INIT_LIST_HEAD(&new_driver->dynids.list);
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retval = driver_register(&new_driver->driver);
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if (!retval) {
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pr_info("%s: registered new driver %s\n",
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usbcore_name, new_driver->name);
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usbfs_update_special();
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usb_create_newid_file(new_driver);
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} else {
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printk(KERN_ERR "%s: error %d registering driver %s\n",
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usbcore_name, retval, new_driver->name);
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver);
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/**
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* usb_deregister - unregister a USB driver
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* @driver: USB operations of the driver to unregister
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* Context: must be able to sleep
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*
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* Unlinks the specified driver from the internal USB driver list.
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*
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* NOTE: If you called usb_register_dev(), you still need to call
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* usb_deregister_dev() to clean up your driver's allocated minor numbers,
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* this * call will no longer do it for you.
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*/
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void usb_deregister(struct usb_driver *driver)
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{
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pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name);
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usb_remove_newid_file(driver);
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usb_free_dynids(driver);
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driver_unregister(&driver->driver);
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usbfs_update_special();
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}
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EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);
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