1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright 2015-2017 Google, Inc 4 */ 5 6 #ifndef __LINUX_USB_TCPM_H 7 #define __LINUX_USB_TCPM_H 8 9 #include <linux/bitops.h> 10 #include <linux/usb/typec.h> 11 #include "pd.h" 12 13 enum typec_cc_status { 14 TYPEC_CC_OPEN, 15 TYPEC_CC_RA, 16 TYPEC_CC_RD, 17 TYPEC_CC_RP_DEF, 18 TYPEC_CC_RP_1_5, 19 TYPEC_CC_RP_3_0, 20 }; 21 22 /* Collision Avoidance */ 23 #define SINK_TX_NG TYPEC_CC_RP_1_5 24 #define SINK_TX_OK TYPEC_CC_RP_3_0 25 26 enum typec_cc_polarity { 27 TYPEC_POLARITY_CC1, 28 TYPEC_POLARITY_CC2, 29 }; 30 31 /* Time to wait for TCPC to complete transmit */ 32 #define PD_T_TCPC_TX_TIMEOUT 100 /* in ms */ 33 #define PD_ROLE_SWAP_TIMEOUT (MSEC_PER_SEC * 10) 34 #define PD_PPS_CTRL_TIMEOUT (MSEC_PER_SEC * 10) 35 36 enum tcpm_transmit_status { 37 TCPC_TX_SUCCESS = 0, 38 TCPC_TX_DISCARDED = 1, 39 TCPC_TX_FAILED = 2, 40 }; 41 42 enum tcpm_transmit_type { 43 TCPC_TX_SOP = 0, 44 TCPC_TX_SOP_PRIME = 1, 45 TCPC_TX_SOP_PRIME_PRIME = 2, 46 TCPC_TX_SOP_DEBUG_PRIME = 3, 47 TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4, 48 TCPC_TX_HARD_RESET = 5, 49 TCPC_TX_CABLE_RESET = 6, 50 TCPC_TX_BIST_MODE_2 = 7 51 }; 52 53 /* Mux state attributes */ 54 #define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */ 55 #define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */ 56 #define TCPC_MUX_POLARITY_INVERTED BIT(2) /* Polarity inverted */ 57 58 /** 59 * struct tcpc_dev - Port configuration and callback functions 60 * @fwnode: Pointer to port fwnode 61 * @get_vbus: Called to read current VBUS state 62 * @get_current_limit: 63 * Optional; called by the tcpm core when configured as a snk 64 * and cc=Rp-def. This allows the tcpm to provide a fallback 65 * current-limit detection method for the cc=Rp-def case. 66 * For example, some tcpcs may include BC1.2 charger detection 67 * and use that in this case. 68 * @set_cc: Called to set value of CC pins 69 * @apply_rc: Optional; Needed to move TCPCI based chipset to APPLY_RC state 70 * as stated by the TCPCI specification. 71 * @get_cc: Called to read current CC pin values 72 * @set_polarity: 73 * Called to set polarity 74 * @set_vconn: Called to enable or disable VCONN 75 * @set_vbus: Called to enable or disable VBUS 76 * @set_current_limit: 77 * Optional; called to set current limit as negotiated 78 * with partner. 79 * @set_pd_rx: Called to enable or disable reception of PD messages 80 * @set_roles: Called to set power and data roles 81 * @start_toggling: 82 * Optional; if supported by hardware, called to start dual-role 83 * toggling or single-role connection detection. Toggling stops 84 * automatically if a connection is established. 85 * @try_role: Optional; called to set a preferred role 86 * @pd_transmit:Called to transmit PD message 87 * @set_bist_data: Turn on/off bist data mode for compliance testing 88 * @enable_frs: 89 * Optional; Called to enable/disable PD 3.0 fast role swap. 90 * Enabling frs is accessory dependent as not all PD3.0 91 * accessories support fast role swap. 92 * @frs_sourcing_vbus: 93 * Optional; Called to notify that vbus is now being sourced. 94 * Low level drivers can perform chip specific operations, if any. 95 * @enable_auto_vbus_discharge: 96 * Optional; TCPCI spec based TCPC implementations can optionally 97 * support hardware to autonomously dischrge vbus upon disconnecting 98 * as sink or source. TCPM signals TCPC to enable the mechanism upon 99 * entering connected state and signals disabling upon disconnect. 100 * @set_auto_vbus_discharge_threshold: 101 * Mandatory when enable_auto_vbus_discharge is implemented. TCPM 102 * calls this function to allow lower levels drivers to program the 103 * vbus threshold voltage below which the vbus discharge circuit 104 * will be turned on. requested_vbus_voltage is set to 0 when vbus 105 * is going to disappear knowingly i.e. during PR_SWAP and 106 * HARD_RESET etc. 107 * @is_vbus_vsafe0v: 108 * Optional; TCPCI spec based TCPC implementations are expected to 109 * detect VSAFE0V voltage level at vbus. When detection of VSAFE0V 110 * is supported by TCPC, set this callback for TCPM to query 111 * whether vbus is at VSAFE0V when needed. 112 * Returns true when vbus is at VSAFE0V, false otherwise. 113 * @set_partner_usb_comm_capable: 114 * Optional; The USB Communications Capable bit indicates if port 115 * partner is capable of communication over the USB data lines 116 * (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit. 117 * @check_contaminant: 118 * Optional; The callback is called when CC pins report open status 119 * at the end of the toggling period. Chip level drivers are 120 * expected to check for contaminant and re-enable toggling if 121 * needed. When 0 is not returned, check_contaminant is expected to 122 * restart toggling after checking the connector for contaminant. 123 * This forces the TCPM state machine to tranistion to TOGGLING state 124 * without calling start_toggling callback. 125 */ 126 struct tcpc_dev { 127 struct fwnode_handle *fwnode; 128 129 int (*init)(struct tcpc_dev *dev); 130 int (*get_vbus)(struct tcpc_dev *dev); 131 int (*get_current_limit)(struct tcpc_dev *dev); 132 int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc); 133 int (*apply_rc)(struct tcpc_dev *dev, enum typec_cc_status cc, enum typec_cc_polarity polarity); 134 int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1, enum typec_cc_status *cc2); 135 int (*set_polarity)(struct tcpc_dev *dev, enum typec_cc_polarity polarity); 136 int (*set_vconn)(struct tcpc_dev *dev, bool on); 137 int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge); 138 int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv); 139 int (*set_pd_rx)(struct tcpc_dev *dev, bool on); 140 int (*set_roles)(struct tcpc_dev *dev, bool attached, enum typec_role role, enum typec_data_role data); 141 int (*start_toggling)(struct tcpc_dev *dev, enum typec_port_type port_type, enum typec_cc_status cc); 142 int (*try_role)(struct tcpc_dev *dev, int role); 143 int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type, const struct pd_message *msg, 144 unsigned int negotiated_rev); 145 int (*set_bist_data)(struct tcpc_dev *dev, bool on); 146 int (*enable_frs)(struct tcpc_dev *dev, bool enable); 147 void (*frs_sourcing_vbus)(struct tcpc_dev *dev); 148 int (*enable_auto_vbus_discharge)(struct tcpc_dev *dev, bool enable); 149 int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode, bool pps_active, 150 u32 requested_vbus_voltage); 151 int (*check_contaminant)(struct tcpc_dev *dev); 152 bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev); 153 void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable); 154 }; 155 156 struct tcpm_port; 157 158 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc); 159 void tcpm_unregister_port(struct tcpm_port *port); 160 161 int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, unsigned int nr_pdo, 162 unsigned int operating_snk_mw); 163 164 void tcpm_vbus_change(struct tcpm_port *port); 165 void tcpm_cc_change(struct tcpm_port *port); 166 void tcpm_sink_frs(struct tcpm_port *port); 167 void tcpm_sourcing_vbus(struct tcpm_port *port); 168 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg); 169 void tcpm_pd_transmit_complete(struct tcpm_port *port, enum tcpm_transmit_status status); 170 void tcpm_pd_hard_reset(struct tcpm_port *port); 171 void tcpm_tcpc_reset(struct tcpm_port *port); 172 bool tcpm_is_debouncing(struct tcpm_port *tcpm); 173 bool tcpm_is_toggling(struct tcpm_port *port); 174 175 #endif /* __LINUX_USB_TCPM_H */ 176