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| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2018-06-27 18:19:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-02 17:42:36 +0200 |
| commit | 8a37d87d72f0c69f837229c04d2fcd7117ea57e7 (patch) | |
| tree | 43cf3111a964678d08fe6638e4459e1c2db50b55 /Documentation/ABI/testing/sysfs-bus-typec | |
| parent | 4ab8c18d4d67321cc7b660559de17511d4fc0237 (diff) | |
| download | linux-8a37d87d72f0c69f837229c04d2fcd7117ea57e7.tar.gz linux-8a37d87d72f0c69f837229c04d2fcd7117ea57e7.tar.bz2 linux-8a37d87d72f0c69f837229c04d2fcd7117ea57e7.zip | |
usb: typec: Bus type for alternate modes
Introducing a simple bus for the alternate modes. Bus allows
binding drivers to the discovered alternate modes the
partners support.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-typec')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-typec | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-typec b/Documentation/ABI/testing/sysfs-bus-typec new file mode 100644 index 000000000000..205d9c91e2e1 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-typec @@ -0,0 +1,51 @@ +What: /sys/bus/typec/devices/.../active +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows if the mode is active or not. The attribute can be used + for entering/exiting the mode. Entering/exiting modes is + supported as synchronous operation so write(2) to the attribute + does not return until the enter/exit mode operation has + finished. The attribute is notified when the mode is + entered/exited so poll(2) on the attribute wakes up. + Entering/exiting a mode will also generate uevent KOBJ_CHANGE. + + Valid values are boolean. + +What: /sys/bus/typec/devices/.../description +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows description of the mode. The description is optional for + the drivers, just like with the Billboard Devices. + +What: /sys/bus/typec/devices/.../mode +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + The index number of the mode returned by Discover Modes USB + Power Delivery command. Depending on the alternate mode, the + mode index may be significant. + + With some alternate modes (SVIDs), the mode index is assigned + for specific functionality in the specification for that + alternate mode. + + With other alternate modes, the mode index values are not + assigned, and can not be therefore used for identification. When + the mode index is not assigned, identifying the alternate mode + must be done with either mode VDO or the description. + +What: /sys/bus/typec/devices/.../svid +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + The Standard or Vendor ID (SVID) assigned by USB-IF for this + alternate mode. + +What: /sys/bus/typec/devices/.../vdo +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows the VDO in hexadecimal returned by Discover Modes command + for this mode. |