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usb: typec: class: add typec_get_data_role symbol 

Alt Mode drivers are responsible for sending Enter Mode through the TCPM,
but only a DFP is allowed to send Enter Mode. typec_get_data_role gets
the port's data role, which can then be used in altmode drivers via
typec_altmode_get_data_role to know if Enter Mode should be sent.

Signed-off-by: RD Babiera <rdbabiera@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20250923181606.1583584-5-rdbabiera@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/1354/merge
RD Babiera 2025-09-23 18:16:07 +00:00 committed by Greg Kroah-Hartman
parent 924aa1d9e0
commit ed4a5c5de5
3 changed files with 27 additions and 0 deletions
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13
drivers/usb/typec/class.c
View File

@ -2120,6 +2120,19 @@ void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
}
EXPORT_SYMBOL_GPL(typec_set_data_role);
/**
* typec_get_data_role - Get port data role
* @port: The USB Type-C Port to query
*
* This routine is used by the altmode drivers to determine if the port is the
* DFP before issuing Enter Mode
*/
enum typec_data_role typec_get_data_role(struct typec_port *port)
{
return port->data_role;
}
EXPORT_SYMBOL_GPL(typec_get_data_role);
/**
* typec_set_pwr_role - Report power role change
* @port: The USB Type-C Port where the role was changed

1
include/linux/usb/typec.h
View File

@ -337,6 +337,7 @@ struct typec_plug *typec_register_plug(struct typec_cable *cable,
void typec_unregister_plug(struct typec_plug *plug);
void typec_set_data_role(struct typec_port *port, enum typec_data_role role);
enum typec_data_role typec_get_data_role(struct typec_port *port);
void typec_set_pwr_role(struct typec_port *port, enum typec_role role);
void typec_set_vconn_role(struct typec_port *port, enum typec_role role);
void typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);

13
include/linux/usb/typec_altmode.h
View File

@ -172,6 +172,19 @@ typec_altmode_get_svdm_version(struct typec_altmode *altmode)
return typec_get_negotiated_svdm_version(typec_altmode2port(altmode));
}
/**
* typec_altmode_get_data_role - Get port data role
* @altmode: Handle to the alternate mode
*
* Alt Mode drivers should only issue Enter Mode through the port if they are
* the DFP.
*/
static inline enum typec_data_role
typec_altmode_get_data_role(struct typec_altmode *altmode)
{
return typec_get_data_role(typec_altmode2port(altmode));
}
/**
* struct typec_altmode_driver - USB Type-C alternate mode device driver
* @id_table: Null terminated array of SVIDs