Android

21-Jan-17 11:18

How to detect OTG Cable when plugged in inside micro usb port and enable switch inside app?

Afzaal Ahmad Zeeshan21-Jan-17 12:28

Afzaal Ahmad Zeeshan

21-Jan-17 12:28

What was the answer given to you for your previous post? Just read the answer 1 thread below.

~~Never mind.~~

The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~

modified 21-Jan-17 18:59pm.

Pavlex421-Jan-17 12:53

21-Jan-17 12:53

This has nothing to do with windows.I want to detect when OTG Cable is plugged inside inside android usb port and go to app and enable switch!!!

Afzaal Ahmad Zeeshan21-Jan-17 13:00

Afzaal Ahmad Zeeshan

21-Jan-17 13:00

That was just an example to give you an example of how other devices can prevent your device from making changes, unless provided with enough permissions.

The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~

Pavlex421-Jan-17 13:08

21-Jan-17 13:08

How to also give permission?

Afzaal Ahmad Zeeshan21-Jan-17 13:12

Afzaal Ahmad Zeeshan

21-Jan-17 13:12

The best way to achieve this will be to install a server application on your own device, and have a client-based application on other devices. Then upon connection, detect the devices and connect to them using server-client channel that you will hold in the network.

This is the safest way, and the simplest way, otherwise USB won't allow much of permissions, such as executing any command (write commands are way too strict).

There are many ways to do this, Android Client-Server Using Sockets – Client Implementation, since you require USB based communication, please check the following and then move onwards to a conclusion.

root access - How do I use Android device with USB OTG device as MTP client for another device? - Android Enthusiasts Stack Exchange
usb on the go - What is the difference between USB On-The-Go (OTG) and USB Host Mode? - Android Enthusiasts Stack Exchange

The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~

Pavlex421-Jan-17 13:36

21-Jan-17 13:36

I cannot have client-based application on other device because it's cable for otg !!!

David Crow24-Jan-17 2:38

David Crow

24-Jan-17 2:38

Pavlex4 wrote:
I want to detect when OTG Cable is plugged inside inside android usb port...

I may be wrong, but I don't think that is possible, since a circuit has not yet been completed. You've basically just extended the wires at the USB port.

"One man's wage rise is another man's price increase." - Harold Wilson

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Jochen Arndt24-Jan-17 3:34

24-Jan-17 3:34

As already said by David, there will be no event when only plugging in a cable.

To monitor events see for example (first result when googling for "android usb events"): How to Monitor USB Events on Android[^].

Read also USB Host and Accessory | Android Developers[^]:

Quote:
Note: Support for USB host and accessory modes are ultimately dependant on the device's hardware, regardless of platform level.

So it might be not possible with your device.

Pavlex424-Jan-17 3:41

24-Jan-17 3:41

When otg cable is plugged in kernel says "USB connector connected" !
How to enable switch inside app when kernel says above message?

or to detect only OTG cable when plugged in or out using android app ? When otg cable is detected inside app should be enabled switch or disabled when otg cable is plugged out?

or to detect when Android enters Host Mode using app?

modified 24-Jan-17 9:50am.

Jochen Arndt24-Jan-17 3:53

24-Jan-17 3:53

Then it is not a simple cable but has built-in resistors or something connected at the other end.

If you got a kernel message, you should be able to get an event using udev rules. But this requires root privileges to save the rules file.

Pavlex424-Jan-17 3:54

24-Jan-17 3:54

My phone is rooted!!!How to get event using udev?

Jochen Arndt24-Jan-17 4:05

24-Jan-17 4:05

Sorry that I mentioned udev. It is not used by Android.

Pavlex424-Jan-17 4:07

24-Jan-17 4:07

Than how to do any of this:

When otg cable is plugged in kernel says "USB connector connected" !
How to enable switch inside app when kernel says above message?

or to detect only OTG cable when plugged in or out using android app ? When otg cable is detected inside app should be enabled switch or disabled when otg cable is plugged out?

or to detect when Android enters Host Mode using app?

Jochen Arndt24-Jan-17 4:23

24-Jan-17 4:23

By inspecting the Android sources to find which module is generating the message (if the message is not prefixed with the module name). Once the module is known check if it provides some kind of notification that can be used.

Or trying to use the provided Android APIs like android.hardware.usb | Android Developers[^].

Or polling the /dev directory for changes.

The host mode is entered when an USB device is attached. That can be detected as described in my initial answer (if supported).

If you did not get a final answer here or searching the web, you can try to do it yourself. This requires some research and implementing one or more of the above.

Pavlex424-Jan-17 4:42

24-Jan-17 4:42

How to find modules that send messages inside kernel source?

Pavlex425-Jan-17 0:22

25-Jan-17 0:22

I have searched all files and I didn't find kernel message for USB !!!!

I ran android terminal on my phone, typed cat /proc/kmsg and when plugged in otg cable I got msm_otg f9a55000.usb : host on

I found that message inside msm_otg kernel source:

C++

static void msm_otg_start_host(struct usb_otg *otg, int on)
{
	struct msm_otg *motg = container_of(otg->phy, struct msm_otg, phy);
	struct msm_otg_platform_data *pdata = motg->pdata;
	struct usb_hcd *hcd;

	if (!otg->host)
		return;
#ifdef CONFIG_USB_HOST_NOTIFY
	msm_otg_host_notify(motg, on);
#endif

	hcd = bus_to_hcd(otg->host);

	if (on) {
		dev_dbg(otg->phy->dev, "host on\n");

		if (pdata->otg_control == OTG_PHY_CONTROL)
			ulpi_write(otg->phy, OTG_COMP_DISABLE,
				ULPI_SET(ULPI_PWR_CLK_MNG_REG));

		/*
		 * Some boards have a switch cotrolled by gpio
		 * to enable/disable internal HUB. Enable internal
		 * HUB before kicking the host.
		 */
		if (pdata->setup_gpio)
			pdata->setup_gpio(OTG_STATE_A_HOST);
		usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
	} else {
		dev_dbg(otg->phy->dev, "host off\n");

		usb_remove_hcd(hcd);
		/* HCD core reset all bits of PORTSC. select ULPI phy */
		writel_relaxed(0x80000000, USB_PORTSC);

		if (pdata->setup_gpio)
			pdata->setup_gpio(OTG_STATE_UNDEFINED);

		if (pdata->otg_control == OTG_PHY_CONTROL)
			ulpi_write(otg->phy, OTG_COMP_DISABLE,
				ULPI_CLR(ULPI_PWR_CLK_MNG_REG));
	}
}

and do I need to create something like this: As code goes by: UEvents in Android - from kernel events to notifications[^]

Jochen Arndt25-Jan-17 0:33

25-Jan-17 0:33

The above code seems to be executed when activating and deactivating the host mode and calls the msm_otg_host_notify function when enabled by build configuration. So it might be useful to inspect this function.

But please understand that I don't have the time and interest to dig into this further (especially because it would also require to get the sources first).

I pointed you to directions that might help to solve the problem. But I'm not going to do the research for you.

Pavlex426-Jan-17 6:20

26-Jan-17 6:20

Can this be helpful.It's from sec-switch.c file!

C++

#ifdef CONFIG_USB_HOST_NOTIFY
	} else if (usb_mode == USB_OTGHOST_DETACHED
		|| usb_mode == USB_OTGHOST_ATTACHED) {

		if (usb_mode == USB_OTGHOST_DETACHED) {
			pr_info("USB Host detached");
			sec_otg_notify(HNOTIFY_ID_PULL);
		} else {
			pr_info("USB Host attached");
			sec_otg_notify(HNOTIFY_ID);
		}

	} else if (usb_mode == USB_POWERED_HOST_DETACHED
		|| usb_mode == USB_POWERED_HOST_ATTACHED) {
		if (usb_mode == USB_POWERED_HOST_DETACHED){
			pr_info("USB Host HNOTIFY_SMARTDOCK_OFF");
			sec_otg_notify(HNOTIFY_SMARTDOCK_OFF);
		}else{
			pr_info("USB Host HNOTIFY_SMARTDOCK_ON");
			sec_otg_notify(HNOTIFY_SMARTDOCK_ON);
		}
#endif
	}
}

or this file sm5502.c :

C++

#if defined(CONFIG_USB_HOST_NOTIFY)
	if (adc == 0x11 || adc == ADC_AUDIO_DOCK) {
		val2 = DEV_AUDIO_DOCK;
		val1 = 0;
	}
#endif
	dev_err(&client->dev,
			"dev1: 0x%x,dev2: 0x%x,dev3: 0x%x,Carkit: 0x%x,ADC: 0x%x,Jig: %s\n",
			val1, val2, val3, val4, adc,
			(check_sm5502_jig_state() ? "ON" : "OFF"));

	/* USB */
	if (val1 & DEV_USB || val2 & DEV_T2_USB_MASK ||
			val4 & DEV_CARKIT_CHARGER1_MASK) {
		pr_info("[MUIC] USB Connected\n");
		pdata->callback(CABLE_TYPE_USB, SM5502_ATTACHED);
	/* USB_CDP */
	} else if (val1 & DEV_USB_CHG) {
		pr_info("[MUIC] CDP Connected\n");
		pdata->callback(CABLE_TYPE_CDP, SM5502_ATTACHED);
	/* UART */
	} else if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
		uart_sm5502_connecting = 1;
		pr_info("[MUIC] UART Connected\n");
		i2c_smbus_write_byte_data(client, REG_MANUAL_SW1, SW_UART);
		if(vbus & DEV_VBUSIN_VALID)
			pdata->callback(CABLE_TYPE_JIG_UART_OFF_VB, SM5502_ATTACHED);
		else
			pdata->callback(CABLE_TYPE_UARTOFF, SM5502_ATTACHED);
#if (!defined(CONFIG_MACH_CT01) && !defined(CONFIG_MACH_CT01_CHN_CU))
		flash_control(true);
#endif
	/* CHARGER */
	} else if ((val1 & DEV_T1_CHARGER_MASK) ||
			(val3 & DEV_T3_CHARGER_MASK)) {
		pr_info("[MUIC] Charger Connected\n");
		pdata->callback(CABLE_TYPE_AC, SM5502_ATTACHED);
#if defined(CONFIG_USB_HOST_NOTIFY)
	/* for SAMSUNG OTG */
	} else if (val1 & DEV_USB_OTG && adc == ADC_OTG) {
		pr_info("[MUIC] OTG Connected\n");

#if defined(CONFIG_MUIC_SM5502_SUPPORT_LANHUB_TA)
		sm5502_enable_rawdataInterrupts(usbsw);
		usbsw->dock_attached = SM5502_ATTACHED;
		usbsw->previous_dock = ADC_OTG;
#endif
		sm5502_set_otg(usbsw, SM5502_ATTACHED);
		pdata->callback(CABLE_TYPE_OTG, SM5502_ATTACHED);
#endif
	/* JIG */
	} else if (val2 & DEV_T2_JIG_MASK) {
		pr_info("[MUIC] JIG Connected\n");
		pdata->callback(CABLE_TYPE_JIG, SM5502_ATTACHED);
#if (!defined(CONFIG_MACH_CT01) && !defined(CONFIG_MACH_CT01_CHN_CU))
		flash_control(true);
#endif
	/* Desk Dock */
	} else if ((val2 & DEV_AV) || (val3 & DEV_AV_VBUS)) {
		pr_info("[MUIC] Deskdock Connected\n");
		local_usbsw->dock_attached = SM5502_ATTACHED;
		if(vbus & DEV_VBUSIN_VALID)
			sm5502_dock_control(usbsw, CABLE_TYPE_DESK_DOCK,
				SM5502_ATTACHED, SW_AUDIO);
		else
			sm5502_dock_control(usbsw, CABLE_TYPE_DESK_DOCK_NO_VB,
				SM5502_ATTACHED, SW_AUDIO);
#if defined(CONFIG_VIDEO_MHL_V2)
	/* MHL */
	} else if (val3 & DEV_MHL) {
		pr_info("[MUIC] MHL Connected\n");
		sm5502_disable_interrupt();
		if (!poweroff_charging)
			/*mhl_ret = mhl_onoff_ex(1); support from sii8240*/
		else
			pr_info("LPM mode, skip MHL sequence\n");
		sm5502_enable_interrupt();
#endif
	/* Car Dock */
	} else if (val2 & DEV_JIG_UART_ON) {
		pr_info("[MUIC] Cardock Connected\n");
#if defined(CONFIG_SEC_FACTORY)
		local_usbsw->dock_attached = SM5502_ATTACHED;
		sm5502_dock_control(usbsw, CABLE_TYPE_CARDOCK,
			SM5502_ATTACHED, SW_AUDIO);
#endif
	/* SmartDock */
	} else if (val2 & DEV_SMARTDOCK) {
		pr_info("[MUIC] Smartdock Connected\n");
		sm5502_dock_control(usbsw, CABLE_TYPE_SMART_DOCK,
			SM5502_ATTACHED, SW_DHOST);
#if defined(CONFIG_VIDEO_MHL_V2)
		/*mhl_onoff_ex(1); support can be added once mhl is up*/
#endif
#if defined(CONFIG_USB_HOST_NOTIFY)
	/* Audio Dock */
	} else if (val2 & DEV_AUDIO_DOCK) {
		pr_info("[MUIC] Audiodock Connected\n");
		sm5502_dock_control(usbsw, CABLE_TYPE_AUDIO_DOCK,
			SM5502_ATTACHED, SW_DHOST);
#endif

#if defined(CONFIG_MUIC_SM5502_SUPPORT_LANHUB_TA)
		/* LANHUB */
	} else if (val2 & DEV_LANHUB) {
		if(usbsw->previous_dock == ADC_LANHUB &&
			usbsw->lanhub_ta_status == 1 )
			/*Skip for the LANHUB+TA Case*/
			pr_info("[MUIC] Lanhub + TA is connected\n");
		else {
		/* Enable RAWDATA Interrupts */
		sm5502_enable_rawdataInterrupts(usbsw);
		sm5502_detect_lanhub(usbsw);
		}
#endif
	/* Incompatible */
    } else if (vbus & DEV_VBUSIN_VALID) {
        pr_info("[MUIC] Incompatible Charger Connected\n");
        pdata->callback(CABLE_TYPE_INCOMPATIBLE,
                SM5502_ATTACHED);
    }
#if defined(CONFIG_TOUCHSCREEN_MMS144)
	else{
		tsp_noti_ignore = 1;
		printk("[TSP] attached, but don't noti \n");
	}
	if(!tsp_noti_ignore)
		tsp_charger_infom(1);

#endif

	usbsw->dev1 = val1;
	usbsw->dev2 = val2;
	usbsw->dev3 = val3;
	usbsw->adc = adc;
	usbsw->vbus = vbus; 
	usbsw->carkit_dev = val4;

	return adc;
}

static int sm5502_detach_dev(struct sm5502_usbsw *usbsw)
{
	struct sm5502_platform_data *pdata = usbsw->pdata;
#if defined(CONFIG_TOUCHSCREEN_MMS144)
	int tsp_noti_ignore = 0;

#endif

	/* USB */
	if (usbsw->dev1 & DEV_USB ||
			usbsw->dev2 & DEV_T2_USB_MASK ||
				usbsw->carkit_dev & DEV_CARKIT_CHARGER1_MASK) {
		pr_info("[MUIC] USB Disonnected\n");
		pdata->callback(CABLE_TYPE_USB, SM5502_DETACHED);
	} else if (usbsw->dev1 & DEV_USB_CHG) {
		pdata->callback(CABLE_TYPE_CDP, SM5502_DETACHED);

	/* UART */
	} else if (usbsw->dev1 & DEV_T1_UART_MASK ||
			usbsw->dev2 & DEV_T2_UART_MASK) {
		pr_info("[MUIC] UART Disonnected\n");
		if(usbsw->vbus & DEV_VBUSIN_VALID)
		pdata->callback(CABLE_TYPE_JIG_UART_OFF_VB, SM5502_DETACHED);
		else
		pdata->callback(CABLE_TYPE_UARTOFF, SM5502_DETACHED);
		uart_sm5502_connecting = 0;
#if (defined(CONFIG_MACH_MS01_EUR_3G) || defined(CONFIG_MACH_MS01_CHN_CMCC_3G) || defined(CONFIG_MACH_MS01_CHN_CU_3G))
		flash_control(false);
#endif
	/* CHARGER */
	} else if ((usbsw->dev1 & DEV_T1_CHARGER_MASK) ||
			(usbsw->dev3 & DEV_T3_CHARGER_MASK)) {
		pr_info("[MUIC] Charger Disonnected\n");
		pdata->callback(CABLE_TYPE_AC, SM5502_DETACHED);
#if defined(CONFIG_USB_HOST_NOTIFY)
	/* for SAMSUNG OTG */
	} else if (usbsw->dev1 & DEV_USB_OTG) {
		pr_info("[MUIC] OTG Disonnected\n");
#if defined(CONFIG_MUIC_SM5502_SUPPORT_LANHUB_TA)
		sm5502_disable_rawdataInterrupts(usbsw);
		pr_info("%s:lanhub_ta_status(%d)\n",
					__func__, usbsw->lanhub_ta_status);
		lanhub_ta_case = false;
		if (usbsw->lanhub_ta_status == 0) {
			pdata->callback(CABLE_TYPE_OTG,SM5502_DETACHED);
			sm5502_set_otg(usbsw, SM5502_DETACHED);
			}
		else if (pdata->lanhub_cb && usbsw->lanhub_ta_status == 1)
			pdata->lanhub_cb(CABLE_TYPE_LANHUB,SM5502_DETACHED, LANHUB);
		usbsw->dock_attached = SM5502_DETACHED;
		usbsw->lanhub_ta_status=0;
#else
		sm5502_set_otg(usbsw, SM5502_DETACHED);
		pdata->callback(CABLE_TYPE_OTG, SM5502_DETACHED);
#endif
#endif
	/* JIG */
	} else if (usbsw->dev2 & DEV_T2_JIG_MASK) {
		pr_info("[MUIC] JIG Disonnected\n");
		pdata->callback(CABLE_TYPE_JIG, SM5502_DETACHED);
#if (defined(CONFIG_MACH_MS01_EUR_3G) || defined(CONFIG_MACH_MS01_CHN_CMCC_3G) || defined(CONFIG_MACH_MS01_CHN_CU_3G))
		flash_control(false);
#endif
	/* Desk Dock */
	} else if ((usbsw->dev2 & DEV_AV) ||
			(usbsw->dev3 & DEV_AV_VBUS)) {
		pr_info("[MUIC] Deskdock Disonnected\n");
		local_usbsw->dock_attached = SM5502_DETACHED;
		if(usbsw->vbus & DEV_VBUSIN_VALID)
			sm5502_dock_control(usbsw, CABLE_TYPE_DESK_DOCK,
				SM5502_DETACHED, SW_ALL_OPEN);
		else
			sm5502_dock_control(usbsw, CABLE_TYPE_DESK_DOCK_NO_VB,
				SM5502_DETACHED, SW_ALL_OPEN);
#if defined(CONFIG_MHL_D3_SUPPORT)
	/* MHL */
	} else if (usbsw->dev3 & DEV_MHL) {
		pr_info("[MUIC] MHL Disonnected\n");
		//mhl_onoff_ex(false);
		detached_sm5502_status = 1;
#endif
	/* Car Dock */
	} else if (usbsw->dev2 & DEV_JIG_UART_ON) {
		pr_info("[MUIC] Cardock Disonnected\n");
#if defined(CONFIG_SEC_FACTORY)
		local_usbsw->dock_attached = SM5502_DETACHED;
		sm5502_dock_control(usbsw, CABLE_TYPE_CARDOCK,
			SM5502_DETACHED, SW_ALL_OPEN);
#endif
	/* Smart Dock */
	} else if (usbsw->dev2 == DEV_SMARTDOCK) {
		pr_info("[MUIC] Smartdock Disonnected\n");
		sm5502_dock_control(usbsw, CABLE_TYPE_SMART_DOCK,
			SM5502_DETACHED, SW_ALL_OPEN);
#if defined(CONFIG_VIDEO_MHL_V2)
		//mhl_onoff_ex(false);
#endif
#if defined(CONFIG_USB_HOST_NOTIFY)
	/* Audio Dock */
	} else if (usbsw->dev2 == DEV_AUDIO_DOCK) {
		pr_info("[MUIC] Audiodock Disonnected\n");
		sm5502_dock_control(usbsw, CABLE_TYPE_AUDIO_DOCK,
			SM5502_DETACHED, SW_ALL_OPEN);
#endif
#if defined(CONFIG_MUIC_SM5502_SUPPORT_LANHUB_TA)
	/* LANHUB */
	} else if (usbsw->adc == ADC_LANHUB) {
		pr_info("[MUIC] Lanhub disconnected\n");
		/* Disable RAWDATA Interrupts */
		sm5502_disable_rawdataInterrupts(usbsw);
		lanhub_ta_case = false;
		usbsw->dock_attached = SM5502_DETACHED;
		sm5502_set_lanhub(usbsw,SM5502_DETACHED);
		sm5502_mask_vbus_detect(usbsw, SM5502_DETACHED);
		pr_info("%s:lanhub_ta_status(%d)\n",__func__, usbsw->lanhub_ta_status);
		if (pdata->lanhub_cb && usbsw->lanhub_ta_status==1)
			pdata->lanhub_cb(CABLE_TYPE_LANHUB, SM5502_DETACHED, LANHUB);
		else if (usbsw->lanhub_ta_status == 0) {
			pdata->callback(CABLE_TYPE_OTG, SM5502_DETACHED);
			sm5502_set_otg(usbsw, SM5502_DETACHED);
			}
		usbsw->lanhub_ta_status=0;
		usbsw->dock_attached = SM5502_DETACHED;

#endif
	/* Incompatible */
    } else if (usbsw->vbus & DEV_VBUSIN_VALID) {
        pr_info("[MUIC] Incompatible Charger Disonnected\n");
        pdata->callback(CABLE_TYPE_INCOMPATIBLE,
                SM5502_DETACHED);
    }

Pavlex427-Jan-17 22:22

27-Jan-17 22:22

How to use app to detect when otg cable is plugged in and when it's plugged out? Is there intent for otg cable like this for usb devices: "android.hardware.usb.action.USB_DEVICE_ATTACHED"

I have created app like this but I only detects flash drive not otg cable:

C++

public class MainActivity extends AppCompatActivity
{

    private TextView mInfo;
    private Logger mLogger;
    private HashMap<UsbDevice, UsbDataBinder> mHashMap = new HashMap<UsbDevice, UsbDataBinder>();
    private UsbManager mUsbManager;
    private PendingIntent mPermissionIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mInfo = (TextView)findViewById(R.id.log);

        mLogger = new Logger(this);
        mLogger.setMode(Logger.MODE_TOAST);

        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);

        usbConnection();
    }

    private void usbConnection() {
        IntentFilter filter = new IntentFilter(UsbManager.ACTION_USB_DEVICE_ATTACHED);
        registerReceiver(mUsbAttachReceiver , filter);
        filter = new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED);
        registerReceiver(mUsbDetachReceiver , filter);

        mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
        filter = new IntentFilter(ACTION_USB_PERMISSION);
        registerReceiver(mUsbReceiver, filter);

        showDevices();
    }

    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mUsbDetachReceiver);
        unregisterReceiver(mUsbAttachReceiver);
        unregisterReceiver(mUsbReceiver);
    };

    BroadcastReceiver mUsbDetachReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
                UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                if (device != null) {
                    // call your method that cleans up and closes communication with the device
                    UsbDataBinder binder = mHashMap.get(device);
                    if (binder != null) {
                        binder.onDestroy();
                        mHashMap.remove(device);
                        Toast.makeText(MainActivity.this, "Attached!", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        }
    };

    BroadcastReceiver mUsbAttachReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
                showDevices();
                Toast.makeText(MainActivity.this, "Detached!", Toast.LENGTH_SHORT).show();
            }
        }
    };

    private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {

        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (ACTION_USB_PERMISSION.equals(action)) {
                synchronized (this) {
                    UsbDevice device = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);

                    if (intent.getBooleanExtra(
                            UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                        if (device != null) {
                            // call method to set up device communication
                            UsbDataBinder binder = new UsbDataBinder(mUsbManager, device);
                            mHashMap.put(device, binder);
                            Toast.makeText(MainActivity.this, "Permission Granted!", Toast.LENGTH_SHORT).show();
                        }
                    } else {
                        // Log.d(TAG, "permission denied for device " + device);
                    }
                }
            }
        }
    };

    private void showDevices() {
        HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
        Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
        while(deviceIterator.hasNext()){
            UsbDevice device = deviceIterator.next();
            mUsbManager.requestPermission(device, mPermissionIntent);
            //your code
            mLogger.log("usb", "name: " + device.getDeviceName() + ", " +
                    "ID: " + device.getDeviceId());
            mInfo.append(device.getDeviceName() + "\n");
            mInfo.append(device.getDeviceId() + "\n");
            mInfo.append(device.getDeviceProtocol() + "\n");
            mInfo.append(device.getProductId() + "\n");
            mInfo.append(device.getVendorId() + "\n");
        }
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

    }
}

David Crow24-Jan-17 4:23

David Crow

24-Jan-17 4:23

Have you tried creating a BroadcastReceiver and registering it with a ACTION_USB_DEVICE_ATTACHED filter?

Pavlex424-Jan-17 4:33

24-Jan-17 4:33

Yes I tried but it only work when I plug in otg cable with usb device attached to it and enable manually otg inside app and enter app that detects it.Without usb device on otg cable it won't detect it!!!I used ACTION_USB_DEVICE_ATTACED with this app: How to Monitor USB Events on Android[^]

Pavlex424-Jan-17 4:42

24-Jan-17 4:42

How to find modules that send messages inside kernel source?
I have found file called host_notifier.c inside /drivers/usb/otg/ inside kernel source!

There is also file called Kconfig which contains this:

#
# USB Host notify configuration
#

config USB_HOST_NOTIFY
	boolean "USB Host notify Driver"
	depends on USB
	help
	  Android framework needs uevents for usb host operation.
	  Host notify Driver serves uevent format
	  that is used by usb host or otg.

config USB_DEBUG_DETEAILED_LOG
	boolean "USB detailed log for debugging"
	depends on USB
	help
	  Add detailed log for debugging.

modified 24-Jan-17 10:53am.

Jochen Arndt24-Jan-17 5:09

24-Jan-17 5:09

That is the kernel config file which defines what has to be compiled. If you have also a Makefile, you can check which sources are compiled when USB_HOST_NOTIFY is set.

But it already contains a hint: It uses uevent.

But again, these might only occur when a device is attached. To know when the cable message is generated, you have to find the message string in the sources.

Pavlex424-Jan-17 6:21