[Important] USB OTG / USB2Go - host mode for Nexus 4?

[iwasblown]

The host isn't powered by the battery.

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---------- Post added at 08:15 AM ---------- Previous post was at 08:14 AM ----------

It is working off of an external power supply.

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---------- Post added at 08:16 AM ---------- Previous post was at 08:15 AM ----------

Turn around the connection.

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[myself11]

I don't have a Nexus 4, but I've been searching about MYDP technology the last couple of days due to the launch of Fonepad Infinity (without micro-sd slot).

I don't know if this info has been posted before, but there seems to be an accessory - even though not released yet AFAIK - that has Micro-USB to HDMI and Micro-USB Y-Dongle. And also a dock. Maybe it will allow usb otg.

http://www.analogix.com/markets/partners.html

 

[ziddey]

See http://xdaforums.com/showthread.php?t=2151159

Got it sort of working, but you need a Y cable and have to switch it on manually. I'm still trying to figure out how to get it to work with regular usb mode at the same time.

I've been trying to go from here but am really in over my head. I've been able to compile Franco's kernel with otg debug mode (CaptainMuon's method -- "otg_user_control"). It'd be fine, but there are problems with this approach-- seemingly when it goes to a_idle, it becomes stuck, and a reboot is needed for either host or peripheral.

Anyone have any ideas on otg_pmic_control? Or a reliable otg_user_control? I've tried setting that mode in board-mako.c, but then there is no /sys/kernel/debug/msm_otg altogether, and assumedly no otg.

 

[ziddey]

May be onto something. I noticed in board-mako.c that apt8064_ehci_host_init() is an empty function. Comparing with board-8064.c, I see:

static void __init apq8064_ehci_host_init(void)
{
        if (machine_is_apq8064_liquid() || machine_is_mpq8064_cdp() ||
                machine_is_mpq8064_hrd() || machine_is_mpq8064_dtv()) {
                if (machine_is_apq8064_liquid())
                        msm_ehci_host_pdata3.dock_connect_irq =
                                        PM8921_MPP_IRQ(PM8921_IRQ_BASE, 9);
                else
                        msm_ehci_host_pdata3.pmic_gpio_dp_irq =
                                                        PMIC_GPIO_DP_IRQ;

                apq8064_device_ehci_host3.dev.platform_data =
                                &msm_ehci_host_pdata3;
                platform_device_register(&apq8064_device_ehci_host3);

#ifdef CONFIG_USB_EHCI_MSM_HOST4
                apq8064_device_ehci_host4.dev.platform_data =
                                &msm_ehci_host_pdata4;
                platform_device_register(&apq8064_device_ehci_host4);
#endif
        }
}

I added the contents along with two definitions:

#define PMIC_GPIO_DP            27    /* PMIC GPIO for D+ change */
#define PMIC_GPIO_DP_IRQ        PM8921_GPIO_IRQ(PM8921_IRQ_BASE, PMIC_GPIO_DP)

Gave it a compile, but it doesn't seem to have any effect.

Anyone?

 

[ziddey]

Also, if anyone is interested in comparing our board-mako.c against the optimus g's board-j1.c:

https://github.com/redbmk/optimus-g-kernel/blob/kernel-3.4.0/arch/arm/mach-msm/lge/j1/board-j1.c

Thanks to redbmk for the git.

 

[ziddey]

Spent a long time trying to figure out how to properly "debug/fix" OTG but was really in over my head, so I resorted to dirty hackjobs for now to provide a solution:

http://xdaforums.com/showthread.php?p=38871971&postcount=159

Thank CaptainMuon for the original proof-of-concept. Without knowing it's possible, I wouldn't have considered fiddling with it. Thank Franco for the kernel that I used as a base.

Detects OTG cable and switches to host mode. On unplug, there's a 25-30s timer before it switches back to peripheral mode.

No /sys/kernel/debug/msm_otg/mode in this build. Will add it back in the next one.

Basically, host mode is triggered based on detection of a "specific" charger. During what's supposed to be the unpowering of the USB port, peripheral mode is triggered, in essence. Going to bed now. Will post exact code changes in msm_otg.c later tonight.

Works on CM10.1 and assumedly whatever else Franco's kernel works on (r93 is based on 4.2.2).

REQUIRES EXTERNAL POWER.

http://d-h.st/Oa0

 

[kris2lee]

No love with Arduino, I guess?

This thread fills me with cold hate because I bought the Nexus 4 so I could play with Arduino and Android. I did not confirm it before from multiple sources because it is my first smart phone and I did read raving reviews about it and saw that it should support OTG.

This and lack of SD card that I too overlooked (hey, what sane person would have no SD card designed in?) makes it clear that this is done only by reason that Google wants to own our data by pushing it into cloud.

Anyway, can please somebody with more knowledge and understanding than me kindly point out what is the current situation?

It is a bit hard to confirm if

a) somebody has ever really managed to get USB host working on Nexus 4,
b) would it be possible to get it work with external power soure (kind of sucks but I could provide additional battery when I'm already on it),
c) would it be possible to get it work without external power soure,
d) probably no love from Google with this so rooting and custom kernel is nessesary?

I'm sorry, I could not root my Nexus because it already suddenly droped the charge from 95% to zero and when it does it again I will like to send it back and have warranty for it.

 

[sga999]

This thread fills me with cold hate because I bought the Nexus 4 so I could play with Arduino and Android. I did not confirm it before from multiple sources because it is my first smart phone and I did read raving reviews about it and saw that it should support OTG.

This and lack of SD card that I too overlooked (hey, what sane person would have no SD card designed in?) makes it clear that this is done only by reason that Google wants to own our data by pushing it into cloud.

Anyway, can please somebody with more knowledge and understanding than me kindly point out what is the current situation?

It is a bit hard to confirm if

a) somebody has ever really managed to get USB host working on Nexus 4,
b) would it be possible to get it work with external power soure (kind of sucks but I could provide additional battery when I'm already on it),
c) would it be possible to get it work without external power soure,
d) probably no love from Google with this so rooting and custom kernel is nessesary?

I'm sorry, I could not root my Nexus because it already suddenly droped the charge from 95% to zero and when it does it again I will like to send it back and have warranty for it.

See this thread.
http://xdaforums.com/showthread.php?t=2181820

This method requires external power source. I have no idea if someone will come up with a way to do it without external power. Rooting and ziddey's custom kernel is required for this method.

EDIT: Actually, I'm not really sure if root is required. I don't know if the stock download mode and/or recovery allow flashing of the kernel or update.zip files. And I don't know if root is a requirement to install a custom recovery. I rooted and then installed twrp recovery, so I can't answer. Maybe someone else can chime in here.

For the manual vold.fstab change, ziddey says: "To create /system/etc/vold.fstab, execute as root" and then he gives the commands. So for this reason alone, maybe root is required.

 

[cobyman7035]

Usb ota is the most wanted hack for nex4!!! If it ever happens. No need to upgrade new phone till 2015!!!

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[crazzzik]

If someone manages to get it to working condition, I'll attempt modding my battery pack to include built in usb storage powered by unused usb port.

 

[jazza_s]

See this thread.
http://xdaforums.com/showthread.php?t=2181820

This method requires external power source. I have no idea if someone will come up with a way to do it without external power. Rooting and ziddey's custom kernel is required for this method.

EDIT: Actually, I'm not really sure if root is required. I don't know if the stock download mode and/or recovery allow flashing of the kernel or update.zip files. And I don't know if root is a requirement to install a custom recovery. I rooted and then installed twrp recovery, so I can't answer. Maybe someone else can chime in here.

For the manual vold.fstab change, ziddey says: "To create /system/etc/vold.fstab, execute as root" and then he gives the commands. So for this reason alone, maybe root is required.

If there could be a dirty hack that used just a small battery or 9v battery as external power that'd be sick.

 

[Matze5800]

AW: [Important] USB OTG / USB2Go - host mode for Nexus 4?

Just connect the battery to a 5v power regulator

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[Muale]

hey guys, have you seen this?
http://youtube.com/embed/gZwPgyiEb84?

from what i've read, for ITG you need external power via Y cable but in this clip there is no Y cable, just a straight USB-microUSB cable.
the phone provides 5v to all the peripherials... how?!

 

[mcta]

It looks like a Galaxy Nexus to me. Maybe just me, but it just doesnt quite look like the Nexus 4 (Same same but different).

 

[ritchea]

It looks like a Galaxy Nexus to me. Maybe just me, but it just doesnt quite look like the Nexus 4 (Same same but different).

Definitely galaxy nexus. I own both. Both have working otg, but N4 is using y connector and power bank with ziddey's kernel mod. The y connector works on GNex as well as Nexus 7. The "power" cable is not needed but does keep a charge going on those devices as well as on the N4.

Sent from my Nexus 7 using Tapatalk 2

 

[Muale]

yup, my bad! it's not Nexus 4 unfortunately

 

[kamranhaghighi]

well it doesn't support OTG anyay i mean almost no way but why don't u use es-explorer LAN to access files from pc or something? i do this for my fathers one as my phone is bricked at(i didn't do it i sold it to someone he bricked it! a noob programmer ) and im going to buy this sacred piss of glass in 12 days after exam
i think they would be many other ways! to connect external storage i had an idea forgoted damn!

 

[RussianBear]

well it doesn't support OTG anyay i mean almost no way but why don't u use es-explorer LAN to access files from pc or something? i do this for my fathers one as my phone is bricked at(i didn't do it i sold it to someone he bricked it! a noob programmer ) and im going to buy this sacred piss of glass in 12 days after exam
i think they would be many other ways! to connect external storage i had an idea forgoted damn!

Chill, man. We have unofficial otg support. Check the dev section.

 

[ziddey]

If anyone is interested, it may be worth looking into flo's (N7 2013) kernel sources since it shares the essential hardware. While it's not likely to be able to have the N4 supply power, we may very well be able to make use of pin5 for proper otg detection. If that's achieved, I imagine a lot more devs would be interested in incorporating support since it won't be a hack anymore. Specifically, we'd need to look at at least msm_otg.c and board-flo, comparing to our board-mako. Not sure what else would be involved, but one issue with regards to pin5 detection on our devices involves slimport support which also uses that pin. Luckily, flo also has slimport and working otg.

 

[punitthereddevil]

Definitely galaxy nexus. I own both. Both have working otg, but N4 is using y connector and power bank with ziddey's kernel mod. The y connector works on GNex as well as Nexus 7. The "power" cable is not needed but does keep a charge going on those devices as well as on the N4.

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