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| author | Prashant Malani <pmalani@chromium.org> | 2020-11-16 23:11:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-18 15:15:58 +0300 |
| commit | e1e52361c61afdf81d81cfbbfa3ce08971e60f50 (patch) | |
| tree | 996c7b6f28ee83f6a0ab044e33c6255c93ee1f2f /include/linux/usb | |
| parent | a07c81ac5015ac5cbcf1f8e20b9ca2974d276b87 (diff) | |
| download | linux-e1e52361c61afdf81d81cfbbfa3ce08971e60f50.tar.xz | |
usb: typec: Add plug num_altmodes sysfs attr
Add a field to the typec_plug struct to record the number of available
altmodes as well as the corresponding sysfs attribute to expose this to
userspace.
This allows userspace to determine whether there are any
remaining alternate modes left to be registered by the kernel driver. It
can begin executing any policy state machine after all available
alternate modes have been registered with the connector class framework.
This value is set to "-1" initially, signifying that a valid number of
alternate modes haven't been set for the plug. The sysfs file remains
hidden as long as the attribute value is -1.
We re-use the partner attribute for number_of_alternate_modes since the
usage and name is similar, and update the corresponding *_show() command
to support both partner and plugs.
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201116201150.2919178-4-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/typec.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h index bc6b1a71cb8a..54475323f83b 100644 --- a/include/linux/usb/typec.h +++ b/include/linux/usb/typec.h @@ -130,6 +130,7 @@ int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmod struct typec_altmode *typec_partner_register_altmode(struct typec_partner *partner, const struct typec_altmode_desc *desc); +int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes); struct typec_altmode *typec_plug_register_altmode(struct typec_plug *plug, const struct typec_altmode_desc *desc); |