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    Subject[PATCH v2 02/14] staging: typec: tcpm: Add get_current_limit tcpc_dev callback
    Date
    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>
    ---
    Changes in v2:
    -s/get_usb2_current_limit/get_current_limit/
    ---
    drivers/staging/typec/tcpm.c | 5 ++++-
    drivers/staging/typec/tcpm.h | 7 +++++++
    2 files changed, 11 insertions(+), 1 deletion(-)

    diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
    index 20eb4eb..8e823af 100644
    --- a/drivers/staging/typec/tcpm.c
    +++ b/drivers/staging/typec/tcpm.c
    @@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
    break;
    case TYPEC_CC_RP_DEF:
    default:
    - limit = 0;
    + if (port->tcpc->get_current_limit)
    + limit = port->tcpc->get_current_limit(port->tcpc);
    + else
    + limit = 0;
    break;
    }

    diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
    index 19c307d..1465668 100644
    --- a/drivers/staging/typec/tcpm.h
    +++ b/drivers/staging/typec/tcpm.h
    @@ -108,6 +108,13 @@ 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);
    --
    2.9.4
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