typec role switch流程

static void smblite_lib_typec_role_check_work(struct work_struct *work)
{
        struct smb_charger *chg = container_of(work, struct smb_charger,
                                        role_reversal_check.work);
        int rc = 0;

        if (chg->connector_type == POWER_SUPPLY_CONNECTOR_MICRO_USB) {
                chg->pr_swap_in_progress = false;
                vote(chg->awake_votable, TYPEC_SWAP_VOTER, false, 0);
                return;
        }

        mutex_lock(&chg->typec_lock);

        switch (chg->dr_mode) {
        case TYPEC_PORT_SNK:
                if (chg->typec_mode < POWER_SUPPLY_TYPEC_SOURCE_DEFAULT) {
                        smblite_lib_dbg(chg, PR_MISC, "Role reversal not latched to UFP in %d msecs. Resetting to DRP mode\n",
                                                ROLE_REVERSAL_DELAY_MS);
                        rc = smblite_lib_force_dr_mode(chg, TYPEC_PORT_DRP);
                        if (rc < 0)
                                smblite_lib_err(chg, "Couldn't to set DRP mode, rc=%d\n",
                                                rc);
                } else {
                        chg->power_role = POWER_SUPPLY_TYPEC_PR_SINK;
                        typec_set_pwr_role(chg->typec_port, TYPEC_SINK);
                        typec_set_data_role(chg->typec_port, TYPEC_DEVICE);
                        smblite_lib_dbg(chg, PR_MISC, "Role changed successfully to SINK");
                }
                break;
        case TYPEC_PORT_SRC:
                if (chg->typec_mode >= POWER_SUPPLY_TYPEC_SOURCE_DEFAULT
                        || chg->typec_mode == POWER_SUPPLY_TYPEC_NONE) {
                        smblite_lib_dbg(chg, PR_MISC, "Role reversal not latched to DFP in %d msecs. Resetting to DRP mode\n",
                                                ROLE_REVERSAL_DELAY_MS);
                        chg->pr_swap_in_progress = false;
                        chg->typec_role_swap_failed = true;
                        rc = smblite_lib_force_dr_mode(chg,
                                                        TYPEC_PORT_DRP);
                        if (rc < 0)
                                smblite_lib_err(chg, "Couldn't to set DRP mode, rc=%d\n",
                                                        rc);
                } else {
                        chg->power_role = POWER_SUPPLY_TYPEC_PR_SOURCE;
                        typec_set_pwr_role(chg->typec_port, TYPEC_SOURCE);
                        typec_set_data_role(chg->typec_port, TYPEC_HOST);
                        smblite_lib_dbg(chg, PR_MISC, "Role changed successfully to SOURCE");
                }
                break;
        default:
                pr_debug("Already in DRP mode\n");
                break;
        }

        chg->pr_swap_in_progress = false;
        vote(chg->awake_votable, TYPEC_SWAP_VOTER, false, 0);
        mutex_unlock(&chg->typec_lock);
}