On 08/06/2017 05:35 AM, Hans de Goede wrote:
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
for USB2 power-sources (through e.g. BC1.2 detection).

This commit adds an optional get_usb2_current_limit tcpc_dev callback
which allows the port-controller to return the detected current-limit
if the CC pin is pulled up with Rp.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
  drivers/staging/typec/tcpm.c | 5 ++++-
  drivers/staging/typec/tcpm.h | 1 +
  2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 20eb4ebcf8c3..9f5adace4309 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_usb2_current_limit)

I think this callback should just be get_current_limit.

+                       limit = port->tcpc->get_usb2_current_limit(port->tcpc);
+               else
+                       limit = 0;
                break;
        }
diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
index 19c307d31a5a..01b7d89379a3 100644
--- a/drivers/staging/typec/tcpm.h
+++ b/drivers/staging/typec/tcpm.h
@@ -108,6 +108,7 @@ struct tcpc_dev {
int (*init)(struct tcpc_dev *dev);
        int (*get_vbus)(struct tcpc_dev *dev);
+       int (*get_usb2_current_limit)(struct tcpc_dev *dev); /* Optional */
        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);


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