Hi, On 06-08-17 16:18, Guenter Roeck wrote:
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 <hdegoede@xxxxxxxxxx> --- 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.
This is only used in the Rp-def case, which usually indicates being connected with an A->C cable to a USB-2 device and the intend is for the callback to implement some USB-2 specific method to detect the supported current-limit, hence the name. If you prefer to name it just get_current_limit I can change it for v2, but IMHO the usb2 part of the name is important as this will not get called when USB-PD negotiation is used, nor when Rp has the Rp15 or Rp30 values. Regards, Hans
+ 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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