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author | Josua Dietze <digidietze@draisberghof.de> | 2011-10-23 14:22:29 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-15 19:18:29 +0100 |
commit | ff231db811803ef3292532d1d87eaf6882a26cc4 (patch) | |
tree | c200ed75706d3b42970d7693dbfbd6c790207714 | |
parent | USB: ehci: report Data Buffer Error in debug mode (diff) | |
download | linux-ff231db811803ef3292532d1d87eaf6882a26cc4.tar.xz linux-ff231db811803ef3292532d1d87eaf6882a26cc4.zip |
USB: Add optional match for interface class to dynamic ID facility
When adding the ID of a composite device dynamically to a driver, all
hitherto unbound interfaces are bound to this driver regardless of their
class, which may not be intended.
The patch adds the option to tell the targeted interface class to a driver
via the "new_id" attribute, in addition to the device ID.
Also, it appends the ABI documentation accordingly.
Example:
$ echo "1234 2a2a ff" >/sys/bus/usb-serial/drivers/option1/new_id
will bind only vendor-specific interfaces to the 3G driver.
Signed-off-by: Josua Dietze <digidietze@draisberghof.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 25 | ||||
-rw-r--r-- | drivers/usb/core/driver.c | 8 |
2 files changed, 32 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index e647378e9e88..b4f548792e32 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb @@ -119,6 +119,31 @@ Description: Write a 1 to force the device to disconnect (equivalent to unplugging a wired USB device). +What: /sys/bus/usb/drivers/.../new_id +Date: October 2011 +Contact: linux-usb@vger.kernel.org +Description: + Writing a device ID to this file will attempt to + dynamically add a new device ID to a USB device driver. + This may allow the driver to support more hardware than + was included in the driver's static device ID support + table at compile time. The format for the device ID is: + idVendor idProduct bInterfaceClass. + The vendor ID and device ID fields are required, the + interface class is optional. + Upon successfully adding an ID, the driver will probe + for the device and attempt to bind to it. For example: + # echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id + +What: /sys/bus/usb-serial/drivers/.../new_id +Date: October 2011 +Contact: linux-usb@vger.kernel.org +Description: + For serial USB drivers, this attribute appears under the + extra bus folder "usb-serial" in sysfs; apart from that + difference, all descriptions from the entry + "/sys/bus/usb/drivers/.../new_id" apply. + What: /sys/bus/usb/drivers/.../remove_id Date: November 2009 Contact: CHENG Renquan <rqcheng@smu.edu.sg> diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 45887a0ff873..73abd8a0647d 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -45,10 +45,12 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids, struct usb_dynid *dynid; u32 idVendor = 0; u32 idProduct = 0; + unsigned int bInterfaceClass = 0; int fields = 0; int retval = 0; - fields = sscanf(buf, "%x %x", &idVendor, &idProduct); + fields = sscanf(buf, "%x %x %x", &idVendor, &idProduct, + &bInterfaceClass); if (fields < 2) return -EINVAL; @@ -60,6 +62,10 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids, dynid->id.idVendor = idVendor; dynid->id.idProduct = idProduct; dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; + if (fields == 3) { + dynid->id.bInterfaceClass = (u8)bInterfaceClass; + dynid->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS; + } spin_lock(&dynids->lock); list_add_tail(&dynid->node, &dynids->list); |