/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright 2015-2017 Google, Inc */ #ifndef __LINUX_USB_TCPM_H #define __LINUX_USB_TCPM_H #include <linux/bitops.h> #include <linux/usb/typec.h> #include "pd.h" enum typec_cc_status { … }; /* Collision Avoidance */ #define SINK_TX_NG … #define SINK_TX_OK … enum typec_cc_polarity { … }; /* Time to wait for TCPC to complete transmit */ #define PD_T_TCPC_TX_TIMEOUT … #define PD_ROLE_SWAP_TIMEOUT … #define PD_PPS_CTRL_TIMEOUT … enum tcpm_transmit_status { … }; enum tcpm_transmit_type { … }; /* Mux state attributes */ #define TCPC_MUX_USB_ENABLED … #define TCPC_MUX_DP_ENABLED … #define TCPC_MUX_POLARITY_INVERTED … /** * struct tcpc_dev - Port configuration and callback functions * @fwnode: Pointer to port fwnode * @get_vbus: Called to read current VBUS state * @get_current_limit: * Optional; 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. * For example, some tcpcs may include BC1.2 charger detection * and use that in this case. * @set_cc: Called to set value of CC pins * @apply_rc: Optional; Needed to move TCPCI based chipset to APPLY_RC state * as stated by the TCPCI specification. * @get_cc: Called to read current CC pin values * @set_polarity: * Called to set polarity * @set_vconn: Called to enable or disable VCONN * @set_vbus: Called to enable or disable VBUS * @set_current_limit: * Optional; called to set current limit as negotiated * with partner. * @set_pd_rx: Called to enable or disable reception of PD messages * @set_roles: Called to set power and data roles * @start_toggling: * Optional; if supported by hardware, called to start dual-role * toggling or single-role connection detection. Toggling stops * automatically if a connection is established. * @try_role: Optional; called to set a preferred role * @pd_transmit:Called to transmit PD message * @set_bist_data: Turn on/off bist data mode for compliance testing * @enable_frs: * Optional; Called to enable/disable PD 3.0 fast role swap. * Enabling frs is accessory dependent as not all PD3.0 * accessories support fast role swap. * @frs_sourcing_vbus: * Optional; Called to notify that vbus is now being sourced. * Low level drivers can perform chip specific operations, if any. * @enable_auto_vbus_discharge: * Optional; TCPCI spec based TCPC implementations can optionally * support hardware to autonomously dischrge vbus upon disconnecting * as sink or source. TCPM signals TCPC to enable the mechanism upon * entering connected state and signals disabling upon disconnect. * @set_auto_vbus_discharge_threshold: * Mandatory when enable_auto_vbus_discharge is implemented. TCPM * calls this function to allow lower levels drivers to program the * vbus threshold voltage below which the vbus discharge circuit * will be turned on. requested_vbus_voltage is set to 0 when vbus * is going to disappear knowingly i.e. during PR_SWAP and * HARD_RESET etc. * @is_vbus_vsafe0v: * Optional; TCPCI spec based TCPC implementations are expected to * detect VSAFE0V voltage level at vbus. When detection of VSAFE0V * 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. * @check_contaminant: * Optional; The callback is called when CC pins report open status * at the end of the deboumce period or when the port is still * toggling. Chip level drivers are expected to check for contaminant * and call tcpm_clean_port when the port is clean. * @cable_comm_capable * Optional; Returns whether cable communication over SOP' is supported * by the tcpc * @attempt_vconn_swap_discovery: * Optional; The callback is called by the TCPM when the result of * a Discover Identity request indicates that the port partner is * a receptacle capable of modal operation. Chip level TCPCI drivers * can implement their own policy to determine if and when a Vconn * swap following Discover Identity on SOP' occurs. * Return true when the TCPM is allowed to request a Vconn swap * after Discovery Identity on SOP. */ struct tcpc_dev { … }; struct tcpm_port; struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc); void tcpm_unregister_port(struct tcpm_port *port); void tcpm_vbus_change(struct tcpm_port *port); void tcpm_cc_change(struct tcpm_port *port); void tcpm_sink_frs(struct tcpm_port *port); void tcpm_sourcing_vbus(struct tcpm_port *port); void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg, enum tcpm_transmit_type rx_sop_type); void tcpm_pd_transmit_complete(struct tcpm_port *port, enum tcpm_transmit_status status); void tcpm_pd_hard_reset(struct tcpm_port *port); void tcpm_tcpc_reset(struct tcpm_port *port); void tcpm_port_clean(struct tcpm_port *port); bool tcpm_port_is_toggling(struct tcpm_port *port); void tcpm_port_error_recovery(struct tcpm_port *port); #endif /* __LINUX_USB_TCPM_H */
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