From 733260ff9c45bd4db60f45d17e8560a4a68dff4d Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 16 Nov 2005 13:41:28 -0800 Subject: [PATCH] [PATCH] USB: add dynamic id functionality to USB core Echo the usb vendor and product id to the "new_id" file in the driver's sysfs directory, and then that driver will be able to bind to a device with those ids if it is present. Example: echo 0557 2008 > /sys/bus/usb/drivers/foo_driver/new_id adds the hex values 0557 and 2008 to the device id table for the foo_driver. Note, usb-serial drivers do not currently work with this capability yet. usb-storage also might have some oddities. Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/driver.c | 218 +++++++++++++++++++++++++++++--------- include/linux/usb.h | 8 ++ 2 files changed, 176 insertions(+), 50 deletions(-) diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 921a21be65..1c06110453 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -27,6 +27,15 @@ #include "hcd.h" #include "usb.h" +static int usb_match_one_id(struct usb_interface *interface, + const struct usb_device_id *id); + +struct usb_dynid { + struct list_head node; + struct usb_device_id id; +}; + + static int generic_probe(struct device *dev) { return 0; @@ -58,6 +67,96 @@ struct device_driver usb_generic_driver = { * usb device or a usb interface. */ int usb_generic_driver_data; +#ifdef CONFIG_HOTPLUG + +/* + * Adds a new dynamic USBdevice ID to this driver, + * and cause the driver to probe for all devices again. + */ +static ssize_t store_new_id(struct device_driver *driver, + const char *buf, size_t count) +{ + struct usb_driver *usb_drv = to_usb_driver(driver); + struct usb_dynid *dynid; + u32 idVendor = 0; + u32 idProduct = 0; + int fields = 0; + + fields = sscanf(buf, "%x %x", &idVendor, &idProduct); + if (fields < 2) + return -EINVAL; + + dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); + if (!dynid) + return -ENOMEM; + + INIT_LIST_HEAD(&dynid->node); + dynid->id.idVendor = idVendor; + dynid->id.idProduct = idProduct; + dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; + + spin_lock(&usb_drv->dynids.lock); + list_add_tail(&usb_drv->dynids.list, &dynid->node); + spin_unlock(&usb_drv->dynids.lock); + + if (get_driver(driver)) { + driver_attach(driver); + put_driver(driver); + } + + return count; +} +static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); + +static int usb_create_newid_file(struct usb_driver *usb_drv) +{ + int error = 0; + + if (usb_drv->probe != NULL) + error = sysfs_create_file(&usb_drv->driver.kobj, + &driver_attr_new_id.attr); + return error; +} + +static void usb_free_dynids(struct usb_driver *usb_drv) +{ + struct usb_dynid *dynid, *n; + + spin_lock(&usb_drv->dynids.lock); + list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { + list_del(&dynid->node); + kfree(dynid); + } + spin_unlock(&usb_drv->dynids.lock); +} +#else +static inline int usb_create_newid_file(struct usb_driver *usb_drv) +{ + return 0; +} + +static inline void usb_free_dynids(struct usb_driver *usb_drv) +{ +} +#endif + +static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, + struct usb_driver *drv) +{ + struct usb_dynid *dynid; + + spin_lock(&drv->dynids.lock); + list_for_each_entry(dynid, &drv->dynids.list, node) { + if (usb_match_one_id(intf, &dynid->id)) { + spin_unlock(&drv->dynids.lock); + return &dynid->id; + } + } + spin_unlock(&drv->dynids.lock); + return NULL; +} + + /* called from driver core with usb_bus_type.subsys writelock */ static int usb_probe_interface(struct device *dev) { @@ -75,6 +174,8 @@ static int usb_probe_interface(struct device *dev) return -EHOSTUNREACH; id = usb_match_id(intf, driver->id_table); + if (!id) + id = usb_match_dynamic_id(intf, driver); if (id) { dev_dbg(dev, "%s - got id\n", __FUNCTION__); @@ -120,6 +221,64 @@ static int usb_unbind_interface(struct device *dev) return 0; } +/* returns 0 if no match, 1 if match */ +static int usb_match_one_id(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct usb_host_interface *intf; + struct usb_device *dev; + + /* proc_connectinfo in devio.c may call us with id == NULL. */ + if (id == NULL) + return 0; + + intf = interface->cur_altsetting; + dev = interface_to_usbdev(interface); + + if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && + id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && + id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) + return 0; + + /* No need to test id->bcdDevice_lo != 0, since 0 is never + greater than any unsigned number. */ + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && + (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && + (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && + (id->bDeviceClass != dev->descriptor.bDeviceClass)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && + (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && + (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && + (id->bInterfaceClass != intf->desc.bInterfaceClass)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && + (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && + (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) + return 0; + + return 1; +} /** * usb_match_id - find first usb_device_id matching device or interface * @interface: the interface of interest @@ -184,16 +343,10 @@ static int usb_unbind_interface(struct device *dev) const struct usb_device_id *usb_match_id(struct usb_interface *interface, const struct usb_device_id *id) { - struct usb_host_interface *intf; - struct usb_device *dev; - /* proc_connectinfo in devio.c may call us with id == NULL. */ if (id == NULL) return NULL; - intf = interface->cur_altsetting; - dev = interface_to_usbdev(interface); - /* It is important to check that id->driver_info is nonzero, since an entry that is all zeroes except for a nonzero id->driver_info is the way to create an entry that @@ -201,50 +354,8 @@ const struct usb_device_id *usb_match_id(struct usb_interface *interface, device and interface. */ for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass || id->driver_info; id++) { - - if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && - id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && - id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) - continue; - - /* No need to test id->bcdDevice_lo != 0, since 0 is never - greater than any unsigned number. */ - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && - (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && - (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && - (id->bDeviceClass != dev->descriptor.bDeviceClass)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && - (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && - (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && - (id->bInterfaceClass != intf->desc.bInterfaceClass)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && - (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && - (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) - continue; - - return id; + if (usb_match_one_id(interface, id)) + return id; } return NULL; @@ -268,6 +379,9 @@ int usb_device_match(struct device *dev, struct device_driver *drv) if (id) return 1; + id = usb_match_dynamic_id(intf, usb_drv); + if (id) + return 1; return 0; } @@ -296,6 +410,8 @@ int usb_register(struct usb_driver *new_driver) new_driver->driver.probe = usb_probe_interface; new_driver->driver.remove = usb_unbind_interface; new_driver->driver.owner = new_driver->owner; + spin_lock_init(&new_driver->dynids.lock); + INIT_LIST_HEAD(&new_driver->dynids.list); usb_lock_all_devices(); retval = driver_register(&new_driver->driver); @@ -305,6 +421,7 @@ int usb_register(struct usb_driver *new_driver) pr_info("%s: registered new driver %s\n", usbcore_name, new_driver->name); usbfs_update_special(); + usb_create_newid_file(new_driver); } else { printk(KERN_ERR "%s: error %d registering driver %s\n", usbcore_name, retval, new_driver->name); @@ -330,6 +447,7 @@ void usb_deregister(struct usb_driver *driver) pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name); usb_lock_all_devices(); + usb_free_dynids(driver); driver_unregister(&driver->driver); usb_unlock_all_devices(); diff --git a/include/linux/usb.h b/include/linux/usb.h index d81b050e59..0dd96ef78c 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -529,6 +529,11 @@ static inline int usb_make_path (struct usb_device *dev, char *buf, /* ----------------------------------------------------------------------- */ +struct usb_dynids { + spinlock_t lock; + struct list_head list; +}; + /** * struct usb_driver - identifies USB driver to usbcore * @owner: Pointer to the module owner of this driver; initialize @@ -553,6 +558,8 @@ static inline int usb_make_path (struct usb_device *dev, char *buf, * @id_table: USB drivers use ID table to support hotplugging. * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set * or your driver's probe function will never get called. + * @dynids: used internally to hold the list of dynamically added device + * ids for this driver. * @driver: the driver model core driver structure. * * USB drivers must provide a name, probe() and disconnect() methods, @@ -588,6 +595,7 @@ struct usb_driver { const struct usb_device_id *id_table; + struct usb_dynids dynids; struct device_driver driver; }; #define to_usb_driver(d) container_of(d, struct usb_driver, driver) -- 2.39.5