typec CC脚检测中断

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[TYPEC_ATTACH_DETACH_IRQ] = {     .name       = "typec-attach-detach",     .handler    = smblite_typec_attach_detach_irq_handler,     .wake       = true, },

 

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irqreturn_t smblite_typec_attach_detach_irq_handler(int irq, void *data) {         struct smb_irq_data *irq_data = data;         struct smb_charger *chg = irq_data->parent_data;         u8 stat;         bool attached = false;         int rc;           /* IRQ not expected to be executed for uUSB, return */         if (chg->connector_type == POWER_SUPPLY_CONNECTOR_MICRO_USB)                 return IRQ_HANDLED;           smblite_lib_dbg(chg, PR_INTERRUPT, "IRQ: %s\n", irq_data->name);           rc = smblite_lib_read(chg, TYPE_C_STATE_MACHINE_STATUS_REG, &stat);         if (rc < 0) {                 smblite_lib_err(chg, "Couldn't read TYPE_C_STATE_MACHINE_STATUS_REG rc=%d\n",                         rc);                 return IRQ_HANDLED;         }           attached = !!(stat & TYPEC_ATTACH_DETACH_STATE_BIT);           if (attached) {                 rc = smblite_lib_read(chg, TYPE_C_MISC_STATUS_REG, &stat);                 if (rc < 0) {                         smblite_lib_err(chg, "Couldn't read TYPE_C_MISC_STATUS_REG rc=%d\n",                                 rc);                         return IRQ_HANDLED;                 }                   if (smblite_lib_get_prop_dfp_mode(chg) ==                                 POWER_SUPPLY_TYPEC_SINK_AUDIO_ADAPTER) {                         chg->sink_src_mode = AUDIO_ACCESS_MODE;                         typec_ra_ra_insertion(chg);                 } else if (stat & SNK_SRC_MODE_BIT) {                         chg->sink_src_mode = SRC_MODE;                         typec_sink_insertion(chg);  //mode的切换                 } else {                         chg->sink_src_mode = SINK_MODE;                         typec_src_insertion(chg);//mode的切换                 }                   rc = typec_partner_register(chg);                 if (rc < 0)                         smblite_lib_err(chg, "Couldn't to register partner rc =%d\n",                                         rc);         } else {                 switch (chg->sink_src_mode) {                 case SRC_MODE:                         typec_sink_removal(chg);                          break;                 case SINK_MODE:                 case AUDIO_ACCESS_MODE:                         typec_src_removal(chg);                         break;                 case UNATTACHED_MODE:                 default:                         typec_mode_unattached(chg);                         break;                 }                   if (!chg->pr_swap_in_progress)                         chg->sink_src_mode = UNATTACHED_MODE;                   /*                  * Restore DRP mode on type-C cable disconnect if role                  * swap is not in progress, to ensure forced sink or src                  * mode configuration is reset properly.                  */                   if (chg->typec_port && !chg->pr_swap_in_progress) {                         /*                          * Schedule the work to differentiate actual removal                          * of cable and detach interrupt during role swap,                          * unregister the partner only during actual cable                          * removal.                          */                         cancel_delayed_work(&chg->pr_swap_detach_work);                         vote(chg->awake_votable, DETACH_DETECT_VOTER, true, 0);                         schedule_delayed_work(&chg->pr_swap_detach_work,                                 msecs_to_jiffies(TYPEC_DETACH_DETECT_DELAY_MS));                         smblite_lib_force_dr_mode(chg, TYPEC_PORT_DRP);                           /*                          * To handle cable removal during role                          * swap failure.                          */                         chg->typec_role_swap_failed = false;                 }         }           rc = smblite_lib_masked_write(chg, USB_CMD_PULLDOWN_REG,                         EN_PULLDOWN_USB_IN_BIT,                         attached ?  0 : EN_PULLDOWN_USB_IN_BIT);         if (rc < 0)                 smblite_lib_err(chg, "Couldn't configure pulldown on USB_IN rc=%d\n",                                 rc);           power_supply_changed(chg->usb_psy);           return IRQ_HANDLED; }

• 　　typec的otg功能，是当otg线插上时CC pin会被到下拉GND，触发typec-attach-detach然后就会切换成host mode,识别设备：

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static void smblite_lib_notify_usb_host(struct smb_charger *chg, bool enable) {         int rc = 0;           /* LDO mode doesn't support OTG */         if (chg->ldo_mode)                 return;           if (enable) {                 smblite_lib_dbg(chg, PR_OTG, "enabling VBUS in OTG mode\n");                 rc = smblite_lib_masked_write(chg, DCDC_CMD_OTG_REG,                                         OTG_EN_BIT, OTG_EN_BIT);  //typec打开otg功能，给设备供电                 if (rc < 0) {                         smblite_lib_err(chg,                                 "Couldn't enable VBUS in OTG mode rc=%d\n", rc);                         return;                 }                 rc = smblite_lib_masked_write(chg, DCDC_BST_VREG_SEL,                                         VBOOST_MASK, VBOOST_5P00V);                 if (rc < 0) {                         smblite_lib_err(chg,                                 "Couldn't write BST_VREG_SEL rc=%d\n", rc);                         return;                 }                 smblite_lib_notify_extcon_props(chg, EXTCON_USB_HOST);         } else {                 smblite_lib_dbg(chg, PR_OTG, "disabling VBUS in OTG mode\n");                 rc = smblite_lib_masked_write(chg, DCDC_CMD_OTG_REG,                                         OTG_EN_BIT, 0);                 if (rc < 0) {                         smblite_lib_err(chg,                                 "Couldn't disable VBUS in OTG mode rc=%d\n",                                 rc);                         return;                 }         }           extcon_set_state_sync(chg->extcon, EXTCON_USB_HOST, enable);//切换host模式         chg->otg_present = enable; }

　当插入typec线CCpin会被上拉到vbus时，切换成device模式：

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static void smblite_lib_notify_device_mode(struct smb_charger *chg, bool enable) {         if (enable)                 smblite_lib_notify_extcon_props(chg, EXTCON_USB);           extcon_set_state_sync(chg->extcon, EXTCON_USB, enable); }

一文详解Type C-CC引脚的作用