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staging: typec: tcpm: Add get_current_limit tcpc_dev callback

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A Rp signalling the default current limit indicates that we're possibly
connected to an USB2 power-source. In some cases the type-c port-controller
may provide the capability to detect the current-limit in this case,
through e.g. BC1.2 detection.

This commit adds an optional get_current_limit tcpc_dev callback which
allows the port-controller to provide current-limit detection for when
the CC pin is pulled up with Rp.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-08-30 11:48:05 +02:00 committed by Greg Kroah-Hartman
parent 26e59b3502
commit ea62cfc71b
2 changed files with 11 additions and 1 deletions
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3
drivers/staging/typec/tcpm.c
View File

@ -685,6 +685,9 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
break;
case TYPEC_CC_RP_DEF:
default:
if (port->tcpc->get_current_limit)
limit = port->tcpc->get_current_limit(port->tcpc);
else
limit = 0;
break;
}

7
drivers/staging/typec/tcpm.h
View File

@ -109,6 +109,13 @@ struct tcpc_dev {
int (*init)(struct tcpc_dev *dev);
int (*get_vbus)(struct tcpc_dev *dev);
/*
* This optional callback gets called by the tcpm core when configured
* as a snk and cc=Rp-def. This allows the tcpm to provide a fallback
* current-limit detection method for the cc=Rp-def case. E.g. some
* tcpcs may include BC1.2 charger detection and use that in this case.
*/
int (*get_current_limit)(struct tcpc_dev *dev);
int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
enum typec_cc_status *cc2);