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| author | Wolfram Sang <wsa@the-dreams.de> | 2014-01-10 19:36:42 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-10 16:54:35 -0800 |
| commit | 2fc82c2de604deabb86b0558be0a301bb2209a19 (patch) | |
| tree | 968d174a545222b71a3e43d44ab10b21fb0c5ac4 /Documentation | |
| parent | c63fe8f6ca3669f1d120ff70523e2911b9966574 (diff) | |
| download | lwn-2fc82c2de604deabb86b0558be0a301bb2209a19.tar.gz lwn-2fc82c2de604deabb86b0558be0a301bb2209a19.zip | |
usb: core: allow a reference device for new_id
Often, usb drivers need some driver_info to get a device to work. To
have access to driver_info when using new_id, allow to pass a reference
vendor:product tuple from which new_id will inherit driver_info.
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index 1430f584b266..614d451cee41 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb @@ -50,13 +50,19 @@ Description: 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. + idVendor idProduct bInterfaceClass RefIdVendor RefIdProduct The vendor ID and device ID fields are required, the - interface class is optional. + rest is optional. The Ref* tuple can be used to tell the + driver to use the same driver_data for the new device as + it is used for the reference device. 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 + Here add a new device (0458:7045) using driver_data from + an already supported device (0458:704c): + # echo "0458 7045 0 0458 704c" > /sys/bus/usb/drivers/foo/new_id + Reading from this file will list all dynamically added device IDs in the same format, with one entry per line. For example: |