include/linux/usb/tcpm.h

   1 /*
   2  * Copyright 2015-2017 Google, Inc
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #ifndef __LINUX_USB_TCPM_H
  16 #define __LINUX_USB_TCPM_H
  17
  18 #include <linux/bitops.h>
  19 #include <linux/usb/typec.h>
  20 #include "pd.h"
  21
  22 enum typec_cc_status {
  23         TYPEC_CC_OPEN,
  24         TYPEC_CC_RA,
  25         TYPEC_CC_RD,
  26         TYPEC_CC_RP_DEF,
  27         TYPEC_CC_RP_1_5,
  28         TYPEC_CC_RP_3_0,
  29 };
  30
  31 enum typec_cc_polarity {
  32         TYPEC_POLARITY_CC1,
  33         TYPEC_POLARITY_CC2,
  34 };
  35
  36 /* Time to wait for TCPC to complete transmit */
  37 #define PD_T_TCPC_TX_TIMEOUT    100             /* in ms        */
  38 #define PD_ROLE_SWAP_TIMEOUT    (MSEC_PER_SEC * 10)
  39
  40 enum tcpm_transmit_status {
  41         TCPC_TX_SUCCESS = 0,
  42         TCPC_TX_DISCARDED = 1,
  43         TCPC_TX_FAILED = 2,
  44 };
  45
  46 enum tcpm_transmit_type {
  47         TCPC_TX_SOP = 0,
  48         TCPC_TX_SOP_PRIME = 1,
  49         TCPC_TX_SOP_PRIME_PRIME = 2,
  50         TCPC_TX_SOP_DEBUG_PRIME = 3,
  51         TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
  52         TCPC_TX_HARD_RESET = 5,
  53         TCPC_TX_CABLE_RESET = 6,
  54         TCPC_TX_BIST_MODE_2 = 7
  55 };
  56
  57 /**
  58  * struct tcpc_config - Port configuration
  59  * @src_pdo:    PDO parameters sent to port partner as response to
  60  *              PD_CTRL_GET_SOURCE_CAP message
  61  * @nr_src_pdo: Number of entries in @src_pdo
  62  * @snk_pdo:    PDO parameters sent to partner as response to
  63  *              PD_CTRL_GET_SINK_CAP message
  64  * @nr_snk_pdo: Number of entries in @snk_pdo
  65  * @max_snk_mv: Maximum acceptable sink voltage in mV
  66  * @max_snk_ma: Maximum sink current in mA
  67  * @max_snk_mw: Maximum required sink power in mW
  68  * @operating_snk_mw:
  69  *              Required operating sink power in mW
  70  * @type:       Port type (TYPEC_PORT_DFP, TYPEC_PORT_UFP, or
  71  *              TYPEC_PORT_DRP)
  72  * @default_role:
  73  *              Default port role (TYPEC_SINK or TYPEC_SOURCE).
  74  *              Set to TYPEC_NO_PREFERRED_ROLE if no default role.
  75  * @try_role_hw:True if try.{Src,Snk} is implemented in hardware
  76  * @alt_modes:  List of supported alternate modes
  77  */
  78 struct tcpc_config {
  79         const u32 *src_pdo;
  80         unsigned int nr_src_pdo;
  81
  82         const u32 *snk_pdo;
  83         unsigned int nr_snk_pdo;
  84
  85         const u32 *snk_vdo;
  86         unsigned int nr_snk_vdo;
  87
  88         unsigned int max_snk_mv;
  89         unsigned int max_snk_ma;
  90         unsigned int max_snk_mw;
  91         unsigned int operating_snk_mw;
  92
  93         enum typec_port_type type;
  94         enum typec_role default_role;
  95         bool try_role_hw;       /* try.{src,snk} implemented in hardware */
  96
  97         const struct typec_altmode_desc *alt_modes;
  98 };
  99
 100 enum tcpc_usb_switch {
 101         TCPC_USB_SWITCH_CONNECT,
 102         TCPC_USB_SWITCH_DISCONNECT,
 103 };
 104
 105 /* Mux state attributes */
 106 #define TCPC_MUX_USB_ENABLED            BIT(0)  /* USB enabled */
 107 #define TCPC_MUX_DP_ENABLED             BIT(1)  /* DP enabled */
 108 #define TCPC_MUX_POLARITY_INVERTED      BIT(2)  /* Polarity inverted */
 109
 110 /* Mux modes, decoded to attributes */
 111 enum tcpc_mux_mode {
 112         TYPEC_MUX_NONE  = 0,                            /* Open switch */
 113         TYPEC_MUX_USB   = TCPC_MUX_USB_ENABLED,         /* USB only */
 114         TYPEC_MUX_DP    = TCPC_MUX_DP_ENABLED,          /* DP only */
 115         TYPEC_MUX_DOCK  = TCPC_MUX_USB_ENABLED |        /* Both USB and DP */
 116                           TCPC_MUX_DP_ENABLED,
 117 };
 118
 119 struct tcpc_mux_dev {
 120         int (*set)(struct tcpc_mux_dev *dev, enum tcpc_mux_mode mux_mode,
 121                    enum tcpc_usb_switch usb_config,
 122                    enum typec_cc_polarity polarity);
 123         bool dfp_only;
 124         void *priv_data;
 125 };
 126
 127 /**
 128  * struct tcpc_dev - Port configuration and callback functions
 129  * @config:     Pointer to port configuration
 130  * @get_vbus:   Called to read current VBUS state
 131  * @get_current_limit:
 132  *              Optional; called by the tcpm core when configured as a snk
 133  *              and cc=Rp-def. This allows the tcpm to provide a fallback
 134  *              current-limit detection method for the cc=Rp-def case.
 135  *              For example, some tcpcs may include BC1.2 charger detection
 136  *              and use that in this case.
 137  * @set_cc:     Called to set value of CC pins
 138  * @get_cc:     Called to read current CC pin values
 139  * @set_polarity:
 140  *              Called to set polarity
 141  * @set_vconn:  Called to enable or disable VCONN
 142  * @set_vbus:   Called to enable or disable VBUS
 143  * @set_current_limit:
 144  *              Optional; called to set current limit as negotiated
 145  *              with partner.
 146  * @set_pd_rx:  Called to enable or disable reception of PD messages
 147  * @set_roles:  Called to set power and data roles
 148  * @start_drp_toggling:
 149  *              Optional; if supported by hardware, called to start DRP
 150  *              toggling. DRP toggling is stopped automatically if
 151  *              a connection is established.
 152  * @try_role:   Optional; called to set a preferred role
 153  * @pd_transmit:Called to transmit PD message
 154  * @mux:        Pointer to multiplexer data
 155  */
 156 struct tcpc_dev {
 157         const struct tcpc_config *config;
 158
 159         int (*init)(struct tcpc_dev *dev);
 160         int (*get_vbus)(struct tcpc_dev *dev);
 161         int (*get_current_limit)(struct tcpc_dev *dev);
 162         int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
 163         int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
 164                       enum typec_cc_status *cc2);
 165         int (*set_polarity)(struct tcpc_dev *dev,
 166                             enum typec_cc_polarity polarity);
 167         int (*set_vconn)(struct tcpc_dev *dev, bool on);
 168         int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge);
 169         int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv);
 170         int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
 171         int (*set_roles)(struct tcpc_dev *dev, bool attached,
 172                          enum typec_role role, enum typec_data_role data);
 173         int (*start_drp_toggling)(struct tcpc_dev *dev,
 174                                   enum typec_cc_status cc);
 175         int (*try_role)(struct tcpc_dev *dev, int role);
 176         int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
 177                            const struct pd_message *msg);
 178         struct tcpc_mux_dev *mux;
 179 };
 180
 181 struct tcpm_port;
 182
 183 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
 184 void tcpm_unregister_port(struct tcpm_port *port);
 185
 186 int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
 187                                     unsigned int nr_pdo);
 188 int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
 189                                   unsigned int nr_pdo,
 190                                   unsigned int max_snk_mv,
 191                                   unsigned int max_snk_ma,
 192                                   unsigned int max_snk_mw,
 193                                   unsigned int operating_snk_mw);
 194
 195 void tcpm_vbus_change(struct tcpm_port *port);
 196 void tcpm_cc_change(struct tcpm_port *port);
 197 void tcpm_pd_receive(struct tcpm_port *port,
 198                      const struct pd_message *msg);
 199 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 200                                enum tcpm_transmit_status status);
 201 void tcpm_pd_hard_reset(struct tcpm_port *port);
 202 void tcpm_tcpc_reset(struct tcpm_port *port);
 203
 204 #endif /* __LINUX_USB_TCPM_H */