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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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