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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: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210202003101.221145-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan 2021-02-01 16:30:59 -08:00 committed by Greg Kroah-Hartman
parent 2b8ff93fd7
commit a69bdb283f
2 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/usb/typec/tcpm/tcpm.c
View File

@ -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) {

5
include/linux/usb/tcpm.h
View File

@ -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;