Commit a69bdb28 authored by Badhri Jagan Sridharan's avatar Badhri Jagan Sridharan Committed by Greg Kroah-Hartman
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usb: typec: tcpm: Add Callback to Usb Communication capable partner 



The USB Communications Capable bit indicates if port
partner is capable of communication over the USB data lines
(e.g. D+/- or SS Tx/Rx). Notify the status of the bit to low
level drivers to perform chip specific operation.
For instance, low level driver enables USB switches on D+/D-
lines to set up data path when the bit is set.

Refactored from patch initially authored by
Kyle Tso <kyletso@google.com>

Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarBadhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210202003101.221145-1-badhri@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2b8ff93f

drivers/usb/typec/tcpm/tcpm.c

+13 −0
Original line number Diff line number Diff line
@@ -3430,6 +3430,14 @@ static void tcpm_unregister_altmodes(struct tcpm_port *port) 
	memset(modep, 0, sizeof(*modep));

}



static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)

{

	tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");



	if (port->tcpc->set_partner_usb_comm_capable)

		port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);

}



static void tcpm_reset_port(struct tcpm_port *port)

{

	int ret;
@@ -3446,6 +3454,7 @@ static void tcpm_reset_port(struct tcpm_port *port) 
	port->attached = false;

	port->pd_capable = false;

	port->pps_data.supported = false;

	tcpm_set_partner_usb_comm_capable(port, false);



	/*

	 * First Rx ID should be 0; set this to a sentinel of -1 so that
@@ -3786,6 +3795,8 @@ static void run_state_machine(struct tcpm_port *port) 
			}

		} else {

			tcpm_pd_send_control(port, PD_CTRL_ACCEPT);

			tcpm_set_partner_usb_comm_capable(port,

							  !!(port->sink_request & RDO_USB_COMM));

			tcpm_set_state(port, SRC_TRANSITION_SUPPLY,

				       PD_T_SRC_TRANSITION);

		}
@@ -4005,6 +4016,8 @@ static void run_state_machine(struct tcpm_port *port) 
		break;

	case SNK_NEGOTIATE_CAPABILITIES:

		port->pd_capable = true;

		tcpm_set_partner_usb_comm_capable(port,

						  !!(port->source_caps[0] & PDO_FIXED_USB_COMM));

		port->hard_reset_count = 0;

		ret = tcpm_pd_send_request(port);

		if (ret < 0) {

include/linux/usb/tcpm.h

+5 −0
Original line number Diff line number Diff line
@@ -108,6 +108,10 @@ enum tcpm_transmit_type { 
 *		is supported by TCPC, set this callback for TCPM to query

 *		whether vbus is at VSAFE0V when needed.

 *		Returns true when vbus is at VSAFE0V, false otherwise.

 * @set_partner_usb_comm_capable:

 *              Optional; The USB Communications Capable bit indicates if port

 *              partner is capable of communication over the USB data lines

 *              (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit.

 */

struct tcpc_dev {

	struct fwnode_handle *fwnode;
@@ -139,6 +143,7 @@ struct tcpc_dev { 
	int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode,

						 bool pps_active, u32 requested_vbus_voltage);

	bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);

	void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);

};



struct tcpm_port;