forked from mirrors/linux
59d4d06c8a
When vbus auto discharge is enabled, TCPCI based TCPC transitions
into Attached.SNK/Attached.SRC state. During PR_SWAP, TCPCI based
TCPC would disconnect when partner changes power roles. TCPC has
to be moved APPLY RC state during PR_SWAP. This is done by
ROLE_CONTROL.CC1 != ROLE_CONTROL.CC2 and
POWER_CONTROL.AutodischargeDisconnect is 0. Once the swap sequence
is done, AutoDischargeDisconnect is re-enabled.
Fixes: f321a02cae ("usb: typec: tcpm: Implement enabling Auto Discharge disconnect support")
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210517192112.40934-3-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
169 lines
6.4 KiB
C
169 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2015-2017 Google, Inc
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*/
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#ifndef __LINUX_USB_TCPM_H
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#define __LINUX_USB_TCPM_H
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#include <linux/bitops.h>
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#include <linux/usb/typec.h>
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#include "pd.h"
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enum typec_cc_status {
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TYPEC_CC_OPEN,
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TYPEC_CC_RA,
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TYPEC_CC_RD,
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TYPEC_CC_RP_DEF,
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TYPEC_CC_RP_1_5,
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TYPEC_CC_RP_3_0,
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};
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/* Collision Avoidance */
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#define SINK_TX_NG TYPEC_CC_RP_1_5
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#define SINK_TX_OK TYPEC_CC_RP_3_0
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enum typec_cc_polarity {
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TYPEC_POLARITY_CC1,
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TYPEC_POLARITY_CC2,
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};
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/* Time to wait for TCPC to complete transmit */
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#define PD_T_TCPC_TX_TIMEOUT 100 /* in ms */
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#define PD_ROLE_SWAP_TIMEOUT (MSEC_PER_SEC * 10)
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#define PD_PPS_CTRL_TIMEOUT (MSEC_PER_SEC * 10)
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enum tcpm_transmit_status {
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TCPC_TX_SUCCESS = 0,
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TCPC_TX_DISCARDED = 1,
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TCPC_TX_FAILED = 2,
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};
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enum tcpm_transmit_type {
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TCPC_TX_SOP = 0,
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TCPC_TX_SOP_PRIME = 1,
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TCPC_TX_SOP_PRIME_PRIME = 2,
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TCPC_TX_SOP_DEBUG_PRIME = 3,
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TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
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TCPC_TX_HARD_RESET = 5,
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TCPC_TX_CABLE_RESET = 6,
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TCPC_TX_BIST_MODE_2 = 7
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};
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/* Mux state attributes */
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#define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */
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#define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */
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#define TCPC_MUX_POLARITY_INVERTED BIT(2) /* Polarity inverted */
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/**
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* struct tcpc_dev - Port configuration and callback functions
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* @fwnode: Pointer to port fwnode
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* @get_vbus: Called to read current VBUS state
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* @get_current_limit:
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* Optional; called by the tcpm core when configured as a snk
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* and cc=Rp-def. This allows the tcpm to provide a fallback
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* current-limit detection method for the cc=Rp-def case.
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* For example, some tcpcs may include BC1.2 charger detection
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* and use that in this case.
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* @set_cc: Called to set value of CC pins
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* @apply_rc: Optional; Needed to move TCPCI based chipset to APPLY_RC state
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* as stated by the TCPCI specification.
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* @get_cc: Called to read current CC pin values
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* @set_polarity:
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* Called to set polarity
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* @set_vconn: Called to enable or disable VCONN
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* @set_vbus: Called to enable or disable VBUS
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* @set_current_limit:
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* Optional; called to set current limit as negotiated
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* with partner.
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* @set_pd_rx: Called to enable or disable reception of PD messages
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* @set_roles: Called to set power and data roles
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* @start_toggling:
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* Optional; if supported by hardware, called to start dual-role
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* toggling or single-role connection detection. Toggling stops
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* automatically if a connection is established.
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* @try_role: Optional; called to set a preferred role
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* @pd_transmit:Called to transmit PD message
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* @set_bist_data: Turn on/off bist data mode for compliance testing
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* @enable_frs:
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* Optional; Called to enable/disable PD 3.0 fast role swap.
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* Enabling frs is accessory dependent as not all PD3.0
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* accessories support fast role swap.
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* @frs_sourcing_vbus:
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* Optional; Called to notify that vbus is now being sourced.
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* Low level drivers can perform chip specific operations, if any.
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* @enable_auto_vbus_discharge:
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* Optional; TCPCI spec based TCPC implementations can optionally
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* support hardware to autonomously dischrge vbus upon disconnecting
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* as sink or source. TCPM signals TCPC to enable the mechanism upon
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* entering connected state and signals disabling upon disconnect.
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* @set_auto_vbus_discharge_threshold:
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* Mandatory when enable_auto_vbus_discharge is implemented. TCPM
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* calls this function to allow lower levels drivers to program the
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* vbus threshold voltage below which the vbus discharge circuit
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* will be turned on. requested_vbus_voltage is set to 0 when vbus
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* is going to disappear knowingly i.e. during PR_SWAP and
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* HARD_RESET etc.
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* @is_vbus_vsafe0v:
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* Optional; TCPCI spec based TCPC implementations are expected to
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* detect VSAFE0V voltage level at vbus. When detection of VSAFE0V
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* is supported by TCPC, set this callback for TCPM to query
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* whether vbus is at VSAFE0V when needed.
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* Returns true when vbus is at VSAFE0V, false otherwise.
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* @set_partner_usb_comm_capable:
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* Optional; The USB Communications Capable bit indicates if port
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* partner is capable of communication over the USB data lines
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* (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit.
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*/
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struct tcpc_dev {
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struct fwnode_handle *fwnode;
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int (*init)(struct tcpc_dev *dev);
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int (*get_vbus)(struct tcpc_dev *dev);
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int (*get_current_limit)(struct tcpc_dev *dev);
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int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
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int (*apply_rc)(struct tcpc_dev *dev, enum typec_cc_status cc,
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enum typec_cc_polarity polarity);
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int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
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enum typec_cc_status *cc2);
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int (*set_polarity)(struct tcpc_dev *dev,
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enum typec_cc_polarity polarity);
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int (*set_vconn)(struct tcpc_dev *dev, bool on);
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int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge);
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int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv);
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int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
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int (*set_roles)(struct tcpc_dev *dev, bool attached,
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enum typec_role role, enum typec_data_role data);
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int (*start_toggling)(struct tcpc_dev *dev,
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enum typec_port_type port_type,
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enum typec_cc_status cc);
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int (*try_role)(struct tcpc_dev *dev, int role);
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int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
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const struct pd_message *msg, unsigned int negotiated_rev);
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int (*set_bist_data)(struct tcpc_dev *dev, bool on);
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int (*enable_frs)(struct tcpc_dev *dev, bool enable);
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void (*frs_sourcing_vbus)(struct tcpc_dev *dev);
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int (*enable_auto_vbus_discharge)(struct tcpc_dev *dev, bool enable);
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int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode,
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bool pps_active, u32 requested_vbus_voltage);
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bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
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void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);
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};
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struct tcpm_port;
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struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
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void tcpm_unregister_port(struct tcpm_port *port);
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void tcpm_vbus_change(struct tcpm_port *port);
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void tcpm_cc_change(struct tcpm_port *port);
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void tcpm_sink_frs(struct tcpm_port *port);
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void tcpm_sourcing_vbus(struct tcpm_port *port);
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void tcpm_pd_receive(struct tcpm_port *port,
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const struct pd_message *msg);
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void tcpm_pd_transmit_complete(struct tcpm_port *port,
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enum tcpm_transmit_status status);
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void tcpm_pd_hard_reset(struct tcpm_port *port);
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void tcpm_tcpc_reset(struct tcpm_port *port);
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#endif /* __LINUX_USB_TCPM_H */
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