Re: [linux-usb-devel] USB Gadget Serial Blocking Read Problem
On Friday 13 July 2007, Sagusti.Robert wrote: Hi, I'm running kernel 2.6.20 on an AT91RM9200 processor. I have the gadget serial driver loaded and I am successfully reading and writing data in and out the USB port to a windows terminal. In my user code, when I open the gadget driver port, I open it with the default blocking flag so that my user thread will sleep while waiting for data to come in. My problem is that when I pull the USB cable which causes a disconnect, the read() call never returns in my user code thereby locking the thread that it is called in. Looks like gs_free_ports() only updates the write side, not the read side ... I have turned on debugs in the driver's module and am I am monitoring the Gadget Driver in another thread by cat /proc/kmsg and can clearly see that the Gadget Driver function gs_disconnect(struct usb_gadget *gadget) is being called. The driver reacts fine to the connects and disconnects but the user mode read() function is the problem. I'm pretty new to driver development and I've been attempting to trace the problem through the tty driver and the line discipline to attempt to understand how things work. After 3 days, I'm gaining some understanding but I really could use some help. I would think that lots of apps would have to handle the USB cord being yanked out. Does anyone have any insight into this? Just that this is clearly a bug in the serial gadget code. The way gadget drivers are supposed to handle disconnect events is to (cleanly) shut down all pending I/O ... and it's not doing that except for write operations. - Dave Thanks for reading. Robert P. Sagusti ENSCO Inc., APA Division 5400 Port Royal Rd. Springfield, VA 22151 (703) 321-4407 [EMAIL PROTECTED] - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget Serial - PXA-270 to WinXP
On Wednesday 27 September 2006 3:06 am, Thomi Aurel RUAG A wrote: Hi Im working on a Intel XScale PXA-270 Board with linux 2.6.17 (linux-2.6.17-pcm027-3). I hope you know that the pxa27x UDC code is still not working very reliably. Oddly enough, the hardware folk Intel tasked with designing USB support on those PXA chips never seemed to understand that configuration management is a job for software ... and that they should just focus on fixing enough bugs to deliver robust data transfer. PXA 21x/25x/26x was bad enough; PXA 27x got worse. gs_set_config: cannot find endpoints udc: config change 09 fail -19? What does this message mean? Did i an error during configuration? Have i forgotten to configure endpoints (would this be necessary)? Configuring PXA 27x UDC hardware is a particular nightmare. Yes, there's all kind of special magic that _someone_ needs to do to work around that truly awful hardware. And from what I hear, nobody has quite managed to figure out all the relevant magic... - Dave - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
Joshua Wise wrote: We certainly should have a serial gadget. In progress. Progress is in the handhelds.org CVS repository, as 'char.c'. I have also started writing a USB gadget serial device. It has the usual tty driver interface so it will look like a normal serial port to user space. Looks like char.c will only have a kernel interface--is that right??? This one supports multiple ports, like a multiport usb serial device. I will probably write a host side serial driver to support the multiple ports--unless there is a good multiport USB serial device to emulate. Any suggestions on this? Right now I am using Greg's generic usb serial driver, but it is one port only. I also plan to do software and maybe hardware flow control and other serial features. -- Al --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I just use ssh over g_ether (2.4.19-rmk7-pxa2), it's less work for me to set up -- but then, I don't need to talk to Windows or such. Right, but unfortunately this is with a very minimalistic kernel. (This is actually part of the Linux As Bootloader project.) The kernel is compiled without networking support, and has no actual userland. (All code is contained in the kernel.) Is there a tutorial out there or a list of what I need to do to get a really teeny driver up and going? g_zero seems to be rather large for what it does... - Dave ~joshua - -- Joshua Wise | www.joshuawise.com GPG Key | 0xEA80E0B3 Quote | lilo I akilled [EMAIL PROTECTED] by mistake -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/U/NTPn9tWOqA4LMRAjmqAJwN5PW7WWr9+n88VED6F30GugpJ1gCeJOhB dNpjOU4LuuXeuut5GnKinhM= =aHlR -END PGP SIGNATURE- --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
Joshua Wise wrote:
Is there a tutorial out there or a list of what I
need to do to get a really teeny driver up and going? g_zero seems to be
rather large for what it does...
No tutorial, at least not now -- beyond the overview in the
2.6 kerneldoc (Documentation/DocBook/gadget.pdf). You'll
need to understand chunks of the USB spec too. Provide the
usb_gadget_driver methods, and work up from there.
Actually I think g_zero is quite small for a driver that handles
several different kinds of hardware, supports two different
configurations, and passes the usb-if tests at both high and
full speeds ... more than you may be thinking! :)
Try trimming things out of zero.c ... easier to prune out
things you don't need (like second config) than to come up
with a really minimal driver (like the one below) and then
morph it back into something that's useful and portable.
- Dave
#include linux/config.h
#include linux/module.h
#include linux/kernel.h
#include linux/delay.h
#include linux/ioport.h
#include linux/sched.h
#include linux/slab.h
#include linux/smp_lock.h
#include linux/errno.h
#include linux/init.h
#include linux/timer.h
#include linux/list.h
#include linux/interrupt.h
#include linux/uts.h
#include linux/version.h
#include linux/device.h
#include linux/moduleparam.h
#include asm/byteorder.h
#include asm/io.h
#include asm/irq.h
#include asm/system.h
#include asm/unaligned.h
#include linux/usb_ch9.h
#include linux/usb_gadget.h
/* This driver is OVERSIMPLIFIED and completely unrealistic,
* because it doesn't support:
*
* - anything except enumeration to a nop configuration
* - hardware other than the pxa2xx udc
* - error checking/handling; fault logging; diagnostics; ...
* - endpoints other then ep0
* - string descriptors
* - non-spotty usb-if conformance
* - ... any useful functionality
*
* DO NOT BASE REAL DRIVERS ON THIS CODE.
*/
#define USB_BUFSIZ 256
struct simple_dev {
struct usb_request *req;
};
/* these descriptors embed pxa-specific knowledge */
static const struct usb_device_descriptor
device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = __constant_cpu_to_le16 (0x0200),
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
.bMaxPacketSize0 = 16,
.bNumConfigurations = 1,
};
static const struct usb_config_descriptor
the_config = {
.bLength = sizeof the_config,
.bDescriptorType = USB_DT_CONFIG,
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower =(100 + 1) / 2,
};
static const struct usb_interface_descriptor
the_intf = {
.bLength = sizeof the_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints =2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
};
static int
config_buf (enum usb_device_speed speed,
u8 *buf, u8 type, unsigned index)
{
const unsigned config_len = USB_DT_CONFIG_SIZE
+ USB_DT_INTERFACE_SIZE;
/* config */
memcpy (buf, the_config, USB_DT_CONFIG_SIZE);
buf [1] = type;
((struct usb_config_descriptor *) buf)-wTotalLength
= __constant_cpu_to_le16 (config_len);
buf += USB_DT_CONFIG_SIZE;
/* one interface */
memcpy (buf, the_intf, USB_DT_INTERFACE_SIZE);
buf += USB_DT_INTERFACE_SIZE;
/* no endpoints */
return config_len;
}
static void simple_setup_complete (struct usb_ep *ep, struct usb_request *req)
{
}
static int
simple_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
struct simple_dev *dev = get_gadget_data (gadget);
struct usb_request *req = dev-req;
int value = -EOPNOTSUPP;
/* this takes shortcuts and embeds pxa-specific knowledge */
switch (ctrl-bRequest) {
case USB_REQ_GET_DESCRIPTOR:
switch (ctrl-wValue 8) {
case USB_DT_DEVICE:
value = min (ctrl-wLength, (u16) sizeof device_desc);
memcpy (req-buf, device_desc, value);
break;
case USB_DT_CONFIG:
value = config_buf (gadget-speed, req-buf,
ctrl-wValue 8,
ctrl-wValue 0xff);
if (value = 0)
value = min (ctrl-wLength, (u16) value);
break;
}
break;
/* our set_{config,interface} is a NOP;
* pxa hw handles get_config and get_interface
*/
case USB_REQ_SET_CONFIGURATION:
case USB_REQ_SET_INTERFACE:
value = 0;
break;
}
RE: [linux-usb-devel] USB Gadget - serial?
Greg mentioned a USB gadget serial device a few days ago and it piqued my interest. I am finishing a gadget and host driver that provides Unix style pipes between a host and device over USB 2.0/1.1. Not sure if the company I am contracting with will be willing to release it GPL or not (my guess is not). However, I could take the experience and write a gadget driver that looks like a known serial device, or write both host and gadget side drivers. What serial device did you want to emulate? Do you have a spec for the protocol? Or were you thinking of both a host and gadget driver? One question--why not use CDCEther and g_ether? They are already written and give you all the features of TCP/IP--better than just a serial port. -- Al From: David Brownell [mailto:[EMAIL PROTECTED] Joshua Wise wrote: I'm working on porting Linux to the iPAQ h1910, and I need a way to get data to the h1910, as it has no serial. I've been eyeing USB Gadget and wondering if it provides anything like the usb-char that pxa2xx and sa11x0 drivers used to provide (basically, something that can be accessed like a serial port on both sides.) It'll be cool to see that working! Nothing like usb-char yet. The idea's come up, but not yet a driver. I just use ssh over g_ether (2.4.19-rmk7-pxa2), it's less work for me to set up -- but then, I don't need to talk to Windows or such. --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tuesday 02 September 2003 2:01 pm, Borchers, Al (C)(STP) wrote: I am finishing a gadget and host driver that provides Unix style pipes between a host and device over USB 2.0/1.1. Not sure if the company I am contracting with will be willing to release it GPL or not (my guess is not). However, I could take the experience and write a gadget driver that looks like a known serial device, or write both host and gadget side drivers. Hrrm, you may be sorta hung there by NDAs and things like that (Thou Shalt Not Reimplement This Elsewhere). It may be more helpful to write a little document on your experiences... What serial device did you want to emulate? Do you have a spec for the protocol? Or were you thinking of both a host and gadget driver? I'm thinking of having it emulate a serial port. This is for Linux As Bootloader, the next-generation iPAQ bootloader, and some new iPAQs do not have a serial port, so we need USB support. One question--why not use CDCEther and g_ether? They are already written and give you all the features of TCP/IP--better than just a serial port. Networking is not compiled into LAB. Too big. -- Al Thanks, ~jwise - -- Joshua Wise | www.joshuawise.com GPG Key | 0xEA80E0B3 Quote | lilo I akilled [EMAIL PROTECTED] by mistake -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/VOnCPn9tWOqA4LMRApe8AJ43hOYUx1Yl0Kr3IZp+5OkMVYtT3gCeN1tg ayvMwCBXw1qVnSFHEc6zo7s= =N+G6 -END PGP SIGNATURE- --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
RE: [linux-usb-devel] USB Gadget - serial?
From: Joshua Wise [mailto:[EMAIL PROTECTED] It may be more helpful to write a little document on your experiences... I started with zero.c and built up from there. That is a great starting place. The code there is needed to handle the basic enumeration duties a USB device is expected to do--you could trim this down some, but you need enough for the host to enumerate the device. zero.c also shows an example of minimal data transfers on a bulk endpoint. That sounds like about what you need. I'm thinking of having it emulate a serial port. To the kernel it will look like a serial port, and to the USB host machine it will look like a serial device, but what serial device should it look like--Keyspan, Belkin, ...? You just have to pick one to emulate--the choice depends on having a host side driver and knowledge of the protocol. Networking is not compiled into LAB. Too big. Right. For your application g_ether is not appropriate, and for your minimal needs emulating a serial device sounds appropriate. Maybe that is where a gadget serial driver would come in handy, or maybe with existing applications that would run on the device side and expect a serial port, rather than networking. -- Al --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
Joshua Wise wrote: I'm thinking of having it emulate a serial port. This is for Linux As Bootloader, the next-generation iPAQ bootloader, and some new iPAQs do not have a serial port, so we need USB support. What's the serial port used for ... command interpreter? Or downloading files? One question--why not use CDCEther and g_ether? They are already written and give you all the features of TCP/IP--better than just a serial port. Networking is not compiled into LAB. Too big. But network boot protocols (UDP, DHCP, TFTP) were designed to fit into much smaller ROMs than you're working with ... :) BLOB has a mini-stack; and I've certainly seen it done with standard kernel networking code. And of course, PXA has enough endpoints that it's possible to eventuall support BOTH models at the same time! - Dave --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tuesday 02 September 2003 6:06 pm, David Brownell wrote: What's the serial port used for ... command interpreter? Or downloading files? Both. bootldr serial code which is ported to LAB has a generic readchar/writechar interface which is overridden by various other things. So yes, command interpreter, and ymodem to download files. But network boot protocols (UDP, DHCP, TFTP) were designed to fit into much smaller ROMs than you're working with ... :) The kernel is already 430k; we need to get it sub-256k. BLOB has a mini-stack; and I've certainly seen it done with standard kernel networking code. That, and ethernet over USB is just too much of a pain. Many of our users can't seem to handle it. And of course, PXA has enough endpoints that it's possible to eventuall support BOTH models at the same time! However we need SA1100 compatibility also. - Dave ~jwise - -- Joshua Wise | www.joshuawise.com GPG Key | 0xEA80E0B3 Quote | lilo I akilled [EMAIL PROTECTED] by mistake -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/VRdePn9tWOqA4LMRAipNAJ4+0oejgLzMQPzRFvZdXPhGDtM+KwCeJ8Xk kDB1wDMlY/k/fWndI2X5fpI= =54cg -END PGP SIGNATURE- --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 The kernel is already 430k; we need to get it sub-256k. Correction: 530k w/ ethernet gadget, networking, and TCP/IP. 380k w/g_zero. Also, luckily, the iPAQ h1900 has 512k of boot flash, but all other iPAQs have a boot sector of 256k. ~jwise ++~jwise; - -- Joshua Wise | www.joshuawise.com GPG Key | 0xEA80E0B3 Quote | lilo I akilled [EMAIL PROTECTED] by mistake -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/VR0RPn9tWOqA4LMRAmi2AJ9euNdVEHeSrMDdsZvlhMC0vDHPTQCffQUx QCsI3d1xuTtgxBWCMPc79ZA= =yTPX -END PGP SIGNATURE- --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
Joshua Wise wrote: The kernel is already 430k; we need to get it sub-256k. Correction: 530k w/ ethernet gadget, networking, and TCP/IP. 380k w/g_zero. Also, luckily, the iPAQ h1900 has 512k of boot flash, but all other iPAQs have a boot sector of 256k. That does seem excessive; you don't need TCP to do network booting, just UDP. A good example of where CONFIG_EMBEDDED should be able to remove bells'n'whistles. Yet I understand completely why you might not be wanting to strip that extra code out yourself ... :) We certainly should have a serial gadget. - Dave --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 That does seem excessive; you don't need TCP to do network booting, just UDP. A good example of where CONFIG_EMBEDDED should be able to remove bells'n'whistles. Gripe, whine, moan. :) Shoulda woulda coulda can't. Wonder if I can do some PF_RAW magic and fake it? 438k without TCP - networking is still DamnBig(tm). (oh, and I failed to mention, I'm compiling with MTD support also for the iPAQ's flash. it looks like a good candidate for stripping down, although I'm getting quite a bit offtopic here.) 8622832641304 90796 162ac net/built-in.o 985001112 136 99748 185a4 drivers/mtd/built-in.o Yet I understand completely why you might not be wanting to strip that extra code out yourself ... :) Most of the 'big' bloat is in fs/. It's mostly distributed bloat, too, so that makes it ++harder to clean up... :( We certainly should have a serial gadget. In progress. Progress is in the handhelds.org CVS repository, as 'char.c'. - Dave ~joshua - -- Joshua Wise | www.joshuawise.com GPG Key | 0xEA80E0B3 Quote | lilo I akilled [EMAIL PROTECTED] by mistake -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/VTbfPn9tWOqA4LMRAvT3AJ0c1D2IA9DYsi+jaTLShRbLeqUXhQCeMwoG z16jUXb71cr8oUhdtr59pwo= =Fadg -END PGP SIGNATURE- --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] USB Gadget - serial?
Joshua Wise wrote: I'm working on porting Linux to the iPAQ h1910, and I need a way to get data to the h1910, as it has no serial. I've been eyeing USB Gadget and wondering if it provides anything like the usb-char that pxa2xx and sa11x0 drivers used to provide (basically, something that can be accessed like a serial port on both sides.) It'll be cool to see that working! Nothing like usb-char yet. The idea's come up, but not yet a driver. I just use ssh over g_ether (2.4.19-rmk7-pxa2), it's less work for me to set up -- but then, I don't need to talk to Windows or such. - Dave --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
