1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright 2015-2017 Google, Inc
6 #ifndef __LINUX_USB_TCPM_H
7 #define __LINUX_USB_TCPM_H
9 #include <linux/bitops.h>
10 #include <linux/usb/typec.h>
13 enum typec_cc_status {
22 enum typec_cc_polarity {
27 /* Time to wait for TCPC to complete transmit */
28 #define PD_T_TCPC_TX_TIMEOUT 100 /* in ms */
29 #define PD_ROLE_SWAP_TIMEOUT (MSEC_PER_SEC * 10)
30 #define PD_PPS_CTRL_TIMEOUT (MSEC_PER_SEC * 10)
32 enum tcpm_transmit_status {
34 TCPC_TX_DISCARDED = 1,
38 enum tcpm_transmit_type {
40 TCPC_TX_SOP_PRIME = 1,
41 TCPC_TX_SOP_PRIME_PRIME = 2,
42 TCPC_TX_SOP_DEBUG_PRIME = 3,
43 TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
44 TCPC_TX_HARD_RESET = 5,
45 TCPC_TX_CABLE_RESET = 6,
46 TCPC_TX_BIST_MODE_2 = 7
49 /* Mux state attributes */
50 #define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */
51 #define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */
52 #define TCPC_MUX_POLARITY_INVERTED BIT(2) /* Polarity inverted */
55 * struct tcpc_dev - Port configuration and callback functions
56 * @fwnode: Pointer to port fwnode
57 * @get_vbus: Called to read current VBUS state
59 * Optional; called by the tcpm core when configured as a snk
60 * and cc=Rp-def. This allows the tcpm to provide a fallback
61 * current-limit detection method for the cc=Rp-def case.
62 * For example, some tcpcs may include BC1.2 charger detection
63 * and use that in this case.
64 * @set_cc: Called to set value of CC pins
65 * @get_cc: Called to read current CC pin values
67 * Called to set polarity
68 * @set_vconn: Called to enable or disable VCONN
69 * @set_vbus: Called to enable or disable VBUS
71 * Optional; called to set current limit as negotiated
73 * @set_pd_rx: Called to enable or disable reception of PD messages
74 * @set_roles: Called to set power and data roles
76 * Optional; if supported by hardware, called to start dual-role
77 * toggling or single-role connection detection. Toggling stops
78 * automatically if a connection is established.
79 * @try_role: Optional; called to set a preferred role
80 * @pd_transmit:Called to transmit PD message
81 * @set_bist_data: Turn on/off bist data mode for compliance testing
83 * Optional; Called to enable/disable PD 3.0 fast role swap.
84 * Enabling frs is accessory dependent as not all PD3.0
85 * accessories support fast role swap.
87 * Optional; Called to notify that vbus is now being sourced.
88 * Low level drivers can perform chip specific operations, if any.
89 * @enable_auto_vbus_discharge:
90 * Optional; TCPCI spec based TCPC implementations can optionally
91 * support hardware to autonomously dischrge vbus upon disconnecting
92 * as sink or source. TCPM signals TCPC to enable the mechanism upon
93 * entering connected state and signals disabling upon disconnect.
94 * @set_auto_vbus_discharge_threshold:
95 * Mandatory when enable_auto_vbus_discharge is implemented. TCPM
96 * calls this function to allow lower levels drivers to program the
97 * vbus threshold voltage below which the vbus discharge circuit
98 * will be turned on. requested_vbus_voltage is set to 0 when vbus
99 * is going to disappear knowingly i.e. during PR_SWAP and
102 * Optional; TCPCI spec based TCPC implementations are expected to
103 * detect VSAFE0V voltage level at vbus. When detection of VSAFE0V
104 * is supported by TCPC, set this callback for TCPM to query
105 * whether vbus is at VSAFE0V when needed.
106 * Returns true when vbus is at VSAFE0V, false otherwise.
109 struct fwnode_handle *fwnode;
111 int (*init)(struct tcpc_dev *dev);
112 int (*get_vbus)(struct tcpc_dev *dev);
113 int (*get_current_limit)(struct tcpc_dev *dev);
114 int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
115 int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
116 enum typec_cc_status *cc2);
117 int (*set_polarity)(struct tcpc_dev *dev,
118 enum typec_cc_polarity polarity);
119 int (*set_vconn)(struct tcpc_dev *dev, bool on);
120 int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge);
121 int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv);
122 int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
123 int (*set_roles)(struct tcpc_dev *dev, bool attached,
124 enum typec_role role, enum typec_data_role data);
125 int (*start_toggling)(struct tcpc_dev *dev,
126 enum typec_port_type port_type,
127 enum typec_cc_status cc);
128 int (*try_role)(struct tcpc_dev *dev, int role);
129 int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
130 const struct pd_message *msg, unsigned int negotiated_rev);
131 int (*set_bist_data)(struct tcpc_dev *dev, bool on);
132 int (*enable_frs)(struct tcpc_dev *dev, bool enable);
133 void (*frs_sourcing_vbus)(struct tcpc_dev *dev);
134 int (*enable_auto_vbus_discharge)(struct tcpc_dev *dev, bool enable);
135 int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode,
136 bool pps_active, u32 requested_vbus_voltage);
137 bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
142 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
143 void tcpm_unregister_port(struct tcpm_port *port);
145 void tcpm_vbus_change(struct tcpm_port *port);
146 void tcpm_cc_change(struct tcpm_port *port);
147 void tcpm_sink_frs(struct tcpm_port *port);
148 void tcpm_sourcing_vbus(struct tcpm_port *port);
149 void tcpm_pd_receive(struct tcpm_port *port,
150 const struct pd_message *msg);
151 void tcpm_pd_transmit_complete(struct tcpm_port *port,
152 enum tcpm_transmit_status status);
153 void tcpm_pd_hard_reset(struct tcpm_port *port);
154 void tcpm_tcpc_reset(struct tcpm_port *port);
156 #endif /* __LINUX_USB_TCPM_H */