linux-stable.git/drivers/usb/typec/class.c, branch v5.12.2

usb: typec: Manage SVDM version

2021-02-09T10:48:54+00:00

PD Spec Revision 3.0 Version 2.0 + ECNs 2020-12-10
  6.4.4.2.3 Structured VDM Version
  "The Structured VDM Version field of the Discover Identity Command
  sent and received during VDM discovery Shall be used to determine the
  lowest common Structured VDM Version supported by the Port Partners or
  Cable Plug and Shall continue to operate using this Specification
  Revision until they are Detached."

Add a variable in typec_capability to specify the highest SVDM version
supported by the port and another variable in typec_partner to cache the
negotiated SVDM version between the port and the partner.

Also add setter/getter functions for the negotiated SVDM version.

Acked-by: Heikki Krogerus 
Signed-off-by: Kyle Tso 
Link: https://lore.kernel.org/r/20210205033415.3320439-2-kyletso@google.com
Signed-off-by: Greg Kroah-Hartman

usb: pd: Update VDO definitions

2021-02-03T13:08:55+00:00

"PD Spec Revision 3.0 Version 2.0 + ECNs 2020-12-10" introduces several
changes regarding the ID Header VDO and the Product Type VDOs.

Signed-off-by: Kyle Tso 
Reviewed-by: Heikki Krogerus 
Link: https://lore.kernel.org/r/20210202161733.932215-3-kyletso@google.com
Signed-off-by: Greg Kroah-Hartman

usb: typec: Return void in typec_partner_set_pd_revision

2021-02-02T18:42:30+00:00

typec_partner_set_pd_revision doesn't need any return value.

Fixes: 29b01295a829 ("usb: typec: Add typec_partner_set_pd_revision")
Reviewed-by: Heikki Krogerus 
Reviewed-by: Benson Leung 
Signed-off-by: Kyle Tso 
Link: https://lore.kernel.org/r/20210202095512.761214-1-kyletso@google.com
Signed-off-by: Greg Kroah-Hartman

usb: typec: Add typec_partner_set_pd_revision

2021-02-01T14:31:34+00:00

The partner's PD revision may be resolved later than the port partner
registration since the port partner creation may take place once
Type-C detects the port has changed state, but before PD communication is
completed.

Add a setter so that the partner's PD revision can be attached to it once
it becomes available.

If the revision is set to a valid version (not 0), the setter will also
refresh the partner's usb_pd flag and notify on "supports_usb_power_delivery"
sysfs property as well.

Reviewed-by: Heikki Krogerus 
Signed-off-by: Benson Leung 
Link: https://lore.kernel.org/r/20210129061406.2680146-4-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman

usb: typec: Provide PD Specification Revision for cable and partner

2021-02-01T14:31:34+00:00

The USB Power Delivery specification Section 6.2.1.1.5 outlines
revision backward compatibility requirements starting from Revision 3.0.

The Port, the Cable Plug, and the Port Partner may support either
revision 2 or revision 3 independently, and communication between ports,
partners, and cables of different revisions are allowed under rules
that the parties agree to communicate between each other using the
lowest common operating revision.

This may mean that Port-to-Partner operating revision comms may be
different than Port-to-CablePlug operating revision comms. For example,
it is possible for a R3.0 port to communicate with a R3.0 partner
using R3.0 messages, while the R3.0 port (in the same session) must
communicate with the R2.0 cable using R2.0 messages only.

Introduce individual revision number properties for cable
and port partner so that the port can track them independently.

Reviewed-by: Heikki Krogerus 
Signed-off-by: Benson Leung 
Link: https://lore.kernel.org/r/20210129061406.2680146-3-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman

usb: typec: Standardize PD Revision format with Type-C Revision

2021-02-01T14:31:34+00:00

The Type-C Revision was in a specific BCD format "0120H" for 1.2.
USB PD revision numbers follow a similar pattern with "0300H" for 3.0.

Standardizes the sysfs format for usb_power_delivery_revision
to align with the BCD format used for usb_typec_revision.

Example values:
- "2.0": USB Power Delivery Release 2.0
- "3.0": USB Power Delivery Release 3.0
- "3.1": USB Power Delivery Release 3.1

Reviewed-by: Heikki Krogerus 
Signed-off-by: Benson Leung 
Link: https://lore.kernel.org/r/20210129061406.2680146-2-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman

usb: typec: Send uevent for num_altmodes update

2021-01-07T13:22:22+00:00

Generate a change uevent when the "number_of_alternate_modes" sysfs file
for partners and plugs is updated by a port driver.

Cc: Heikki Krogerus 
Cc: Benson Leung 
Signed-off-by: Prashant Malani 
Link: https://lore.kernel.org/r/20210107034904.4112029-1-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman

usb: typec: Add class for plug alt mode device

2020-12-11T10:07:59+00:00

Add the Type C class for plug alternate mode devices which are being
registered by the Type C connector class. This ensures that udev events
get generated when the plug alt modes are registered.

Cc: Heikki Krogerus 
Reviewed-by: Benson Leung 
Reviewed-by: Heikki Krogerus 
Signed-off-by: Prashant Malani 
Link: https://lore.kernel.org/r/20201210211653.879044-1-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman

usb: typec: Add type sysfs attribute file for partners

2020-11-26T12:40:43+00:00

USB Power Delivery Specification defines a set of product
types for partners and cables. The product type can be read
from the ID Header VDO which is the first object in the
response to the Discover Identity command. This attribute
will display the product type of the partner. The cables
already have the attribute.

This sysfs attribute file is only created for the partners
and cables if the product type is really known in the
driver. Some interfaces do not give access to the Discover
Identity response from the partner or cable, but they may
still supply the product type separately in some cases.

When the product type of the partner or cable is detected,
uevent is also raised with PRODUCT_TYPE set to show the
actual product type (for example PRODUCT_TYPE=host).

Signed-off-by: Heikki Krogerus 
Link: https://lore.kernel.org/r/20201126115735.50529-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman

usb: typec: Constify static attribute_group structs

2020-11-26T12:40:42+00:00

These are never modified, so make them const to allow the compiler to
put them in read-only memory. Done with the help of coccinelle.

Signed-off-by: Rikard Falkeborn 
Link: https://lore.kernel.org/r/20201125162500.37228-3-rikard.falkeborn@gmail.com
Signed-off-by: Greg Kroah-Hartman