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https://github.com/torvalds/linux
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[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 <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
parent
ddae41be61
commit
733260ff9c
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@ -27,6 +27,15 @@
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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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@ -58,6 +67,96 @@ struct device_driver usb_generic_driver = {
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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->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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return error;
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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 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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@ -75,6 +174,8 @@ static int usb_probe_interface(struct device *dev)
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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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@ -120,6 +221,64 @@ static int usb_unbind_interface(struct device *dev)
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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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@ -184,16 +343,10 @@ static int usb_unbind_interface(struct device *dev)
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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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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 NULL;
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intf = interface->cur_altsetting;
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dev = interface_to_usbdev(interface);
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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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@ -201,49 +354,7 @@ const struct usb_device_id *usb_match_id(struct usb_interface *interface,
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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 ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
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id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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continue;
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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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@ -268,6 +379,9 @@ int usb_device_match(struct device *dev, struct device_driver *drv)
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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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@ -296,6 +410,8 @@ int usb_register(struct usb_driver *new_driver)
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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 = new_driver->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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usb_lock_all_devices();
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retval = driver_register(&new_driver->driver);
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@ -305,6 +421,7 @@ int usb_register(struct usb_driver *new_driver)
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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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@ -330,6 +447,7 @@ void usb_deregister(struct usb_driver *driver)
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pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name);
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usb_lock_all_devices();
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usb_free_dynids(driver);
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driver_unregister(&driver->driver);
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usb_unlock_all_devices();
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@ -529,6 +529,11 @@ static inline int usb_make_path (struct usb_device *dev, char *buf,
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/* ----------------------------------------------------------------------- */
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struct usb_dynids {
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spinlock_t lock;
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struct list_head list;
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};
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/**
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* struct usb_driver - identifies USB driver to usbcore
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* @owner: Pointer to the module owner of this driver; initialize
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@ -553,6 +558,8 @@ static inline int usb_make_path (struct usb_device *dev, char *buf,
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* @id_table: USB drivers use ID table to support hotplugging.
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* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
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* or your driver's probe function will never get called.
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* @dynids: used internally to hold the list of dynamically added device
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* ids for this driver.
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* @driver: the driver model core driver structure.
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*
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* USB drivers must provide a name, probe() and disconnect() methods,
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@ -588,6 +595,7 @@ struct usb_driver {
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const struct usb_device_id *id_table;
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struct usb_dynids dynids;
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struct device_driver driver;
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};
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#define to_usb_driver(d) container_of(d, struct usb_driver, driver)
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