linux-toradex.git/drivers/usb/class/usblp.c, branch v2.6.20.19

USB: usblp.c - add Kyocera Mita FS 820 to list of "quirky" printers

2007-01-05T20:19:10+00:00

This patch gets the Kyocera FS-820 working with cups 1.2 via usb again. It
adds the printer to the list of "quirky" printers. The printer seems not
answer to ID requests some seconds after plugging in. Patch is based on
linux-2.6.19.1.

Background:
As far as I could see (strace, usbmon), the Kyocera FS-820 answers to ID
requests only a few seconds after plugging it in. This applies to detecting
it with cups and is also true for the printing itself, which is initiated
with an ID request. Since I have little usb knowledge, maybe someone can
interpret the data, especially the fist bulk transfer - why request 8192
bytes? This is the second version of the patch.

usbmon output of printing an email without patch:
tail -F /tmp/printlog.txt
c636e140 3374734463 S Bi:002:02 -115 8192 <
c9d43b40 3374734494 S Ci:002:00 s a1 00 0000 0000 03ff 1023 <
c9d43b40 3379732301 C Ci:002:00 -104 0
c636e140 3379733294 C Bi:002:02 -2 0
[...repeating...]

with patch:
tail -F /tmp/printlog.txt
d9cb82c0 3729790131 S Ci:002:00 s a1 00 0000 0000 03ff 1023 <
d9cb82c0 3729791725 C Ci:002:00 0 91 = 005b4944 3a46532d 3832303b 4d46473a
 4b796f63 6572613b 434d443a 50434c58 df956320 3732493190 S Bo:002:01 -115
 1347 = 1b252d31 32333435 5840504a 4c0a4050 4a4c2053 4554204d 414e5541
 4c464545 [...more data...]

Signed-off-by: Martin Williges 
Signed-off-by: Greg Kroah-Hartman

USB: mutexification of usblp

2006-12-20T18:13:23+00:00

this patch:
- converts usblp fully to mutex
- makes sleeping interruptible where EINTR can be returned anyway

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: usblp: fix system suspend for some systems

2006-11-03T19:57:18+00:00

this has been confirmed to fix suspend problems with usblp.

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: failure in usblp's error path

2006-11-03T19:57:18+00:00

if urb submission fails due to a transient error here eg. ENOMEM
, the driver is dead. This fixes it.

	Regards
		Oliver

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: fix suspend support for usblp

2006-10-17T21:46:31+00:00

this implements suspend support for usblp. According to the CUPS people
ENODEV will make CUPS retry the job. Thus it is returned in the runtime
case. My printer survives suspend/resume cycles with it.

Signed-off-by: Oliver Neukum 
Signed-off-by: Vojtech Pavlik 
Signed-off-by: Greg Kroah-Hartman

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

USB: fix __must_check warnings in drivers/usb/class/

2006-09-27T18:58:58+00:00

Signed-off-by: Greg Kroah-Hartman

USB: usblp: Use usb_endpoint_* functions.

2006-09-27T18:58:53+00:00

Signed-off-by: Luiz Fernando N. Capitulino 
Signed-off-by: Greg Kroah-Hartman

USB: Make file operations structs in drivers/usb const.

2006-09-27T18:58:52+00:00

Making structs const prevents accidental bugs and with the proper debug
options they're protected against corruption.

Signed-off-by: Luiz Fernando N. Capitulino 
Signed-off-by: Greg Kroah-Hartman

[PATCH] USB: convert a bunch of USB semaphores to mutexes

2006-03-20T22:49:55+00:00

the patch below converts a bunch of semaphores-used-as-mutex in the USB
code to mutexes

Signed-off-by: Arjan van de Ven 
Signed-off-by: Greg Kroah-Hartman