topic Re: How to use USB composite device? in i.MX Processors

How to use USB composite device?

felixhsu — Mon, 20 Aug 2018 02:43:42 GMT

Hi All

Platform: i.MX6ULL

Software: Linux_4.9.11

The customer want to use USB composite device, one for HID and one for mass storage.

would you provide how to configuration USB driver for composite device?

Thanks.

Re: How to use USB composite device?

alexkuo — Mon, 20 Aug 2018 05:06:19 GMT

Hi All

I have the same issue, too.

I found some article but still not solve the issue. I have trawled through many articles with no luck.

1. https://community.nxp.com/thread/318511

2. https://community.nxp.com/thread/481706

I post it.

3. https://community.nxp.com/thread/282200

g_multi.ko needs driver. Windows shows up as an unknow device "Multifunction Composite Gadget". I need a HID and a mass storage.

4. https://unix.stackexchange.com/questions/373569/emulating-usb-device-with-a-file-using-g-mass-storage-udc-core-couldnt-find

HID is work OK. But mass storage is still not work at all. log as below:

root@imx6ull14x14evk:~# modprobe dummy_hcd

dummy_hcd dummy_hcd.0: USB Host+Gadget Emulator, driver 02 May 2005

dummy_hcd dummy_hcd.0: Dummy host controller

dummy_hcd dummy_hcd.0: new USB bus registered, assigned bus number 1

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 1 port detected

2188000.ethernet supply phy not found, using dummy regulator

root@imx6ull14x14evk:~# pps pps0: new PPS source ptp0

alloc_contig_range: [8c058, 8c060) PFNs busy

2188000.ethernet supply phy not found, using dummy regulator

pps pps0: new PPS source ptp0

alloc_contig_range: [8c058, 8c060) PFNs busy

root@imx6ull14x14evk:~#

root@imx6ull14x14evk:~# modprobe g_hid

2188000.ethernet supply phy not found, using dummy regulator

pps pps0: new PPS source ptp0

alloc_contig_range: [8c058, 8c060) PFNs busy

g_hid gadget: HID Gadget, version: 2010/03/16

g_hid gadget: g_hid ready

root@imx6ull14x14evk:~# g_hid gadget: high-speed config #1: HID Gadget

root@imx6ull14x14evk:~#

root@imx6ull14x14evk:~# modprobe g_mass_storage file=/dev/mmcblk1

Mass Storage Function, version: 2009/09/11

LUN: removable file: (no medium)

LUN: file: /dev/mmcblk1

Number of LUNs=1

g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11

g_mass_storage gadget: userspace failed to provide iSerialNumber

g_mass_storage gadget: g_mass_storage ready

root@imx6ull14x14evk:~# usb 1-1: new high-speed USB device number 2 using dummy_hcd

g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage

usb-storage 1-1:1.0: USB Mass Storage device detected

usb-storage 1-1:1.0: Quirks match for vid 0525 pid a4a5: 10000

scsi host0: usb-storage 1-1:1.0

2188000.ethernet supply phy not found, using dummy regulator

pps pps0: new PPS source ptp0

alloc_contig_range: [8c058, 8c060) PFNs busy

scsi 0:0:0:0: Direct-Access Linux File-Stor Gadget 0409 PQ: 0 ANSI: 2

2188000.ethernet supply phy not found, using dummy regulator

pps pps0: new PPS source ptp0

alloc_contig_range: [8c058, 8c060) PFNs busy

sd 0:0:0:0: [sda] 7405568 512-byte logical blocks: (3.79 GB/3.53 GiB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

sda: sda1 sda2 sda3 sda4

sd 0:0:0:0: [sda] Attached SCSI disk

root@imx6ull14x14evk:~#

root@imx6ull14x14evk:~# lsusb

Bus 001 Device 002: ID 0525:a4a5 Netchip Technology, Inc. Pocketbook Pro 903

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Re: How to use USB composite device?

Rita_Wang — Fri, 24 Aug 2018 03:15:53 GMT

Hi，

You doesn't need to re-configure USB driver. There are two USB port on i.mx6ulL evk board, one is USB OTG with microUSB connector, the other is USB Host. For HID device, customer can connect it to USB host; for Mass storage, customer can use a USB OTG to HOST cable to connect microUSB connector, and the other side of the cable is used to connect mass storage, such as moble disk or U disk.

Hope this can do help for you.
Have a great day,
Rita

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Re: How to use USB composite device?

Rita_Wang — Fri, 24 Aug 2018 03:17:04 GMT

Hi Alex,

You can refer to my later reply. It maybe do help for you.

Have a nice day

Rita

Re: How to use USB composite device?

felixhsu — Thu, 30 Aug 2018 11:02:20 GMT

Hi Rita

The customer is want to use same USB port let PC recognize two USB type device, for example USB HID and USB mass storage.

Thanks.

Re: How to use USB composite device?

marcomadrigal — Thu, 30 Aug 2018 14:52:55 GMT

Hi,

You can not modprobe two independent gadget drivers. For this, you need to use a composite driver that registers both functions. You can do this in two ways:

1. To use a single legacy composite driver (actually you are already using the legacy drivers on your tests), this is, you need to create a custom kernel module instead of using g_mass_storage and g_hid separately. See drivers/usb/gadget/legacy/acm_ms.c for an example.

2. You can configure the composite driver from userspace using configfs:

https://events.static.linuxfound.org/sites/events/files/slides/USB%20Gadget%20Configfs%20API_0.pdf

Best Regards,

-Marco

GStreamer Development | Embedded Linux Development | Linux SDK