Fix functionfs build to handle CONFIG_NET not enabled, to prevent
these build errors:

ERROR: "netif_carrier_on" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "netif_carrier_off" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_realloc_headroom" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_trim" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "netif_rx" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "alloc_etherdev_mq" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "ethtool_op_get_link" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "free_netdev" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "register_netdev" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_push" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_pull" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "dev_kfree_skb_any" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_queue_tail" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "__alloc_skb" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "eth_type_trans" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "eth_validate_addr" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_dequeue" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "unregister_netdev" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "__netif_schedule" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "skb_put" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "eth_mac_addr" [drivers/usb/gadget/g_ffs.ko] undefined!
ERROR: "dev_get_stats" [drivers/usb/gadget/g_ffs.ko] undefined!
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NMichał Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Our virtual xHCI device can have as many ports as we like - I've tested
this patch with 31.
Signed-off-by: NWilliam Gulland <wgulland@vmware.com>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Now on one uses this function and it seems useless,
so remove usb_find_device.

[tom@tom linux-2.6-next]$ grep -r -n -I usb_find_device ./
drivers/media/dvb/dvb-usb/dvb-usb-init.c:160:static struct
dvb_usb_device_description * dvb_usb_find_device(struct usb_device
*udev,struct dvb_usb_device_properties *props, int *cold)

drivers/media/dvb/dvb-usb/dvb-usb-init.c:230:   if ((desc =
dvb_usb_find_device(udev,props,&cold)) == NULL) {

drivers/usb/core/usb.c:630: * usb_find_device - find a specific usb device in the system
drivers/usb/core/usb.c:642:struct usb_device *usb_find_device(u16 vendor_id, u16 product_id)
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

In to places in fsg_common_init() an unconditional call to kfree()
on common was performed in error recovery which is not a valid
behaviour since fsg_common structure is not always allocated by
fsg_common_init().

To fix, the calls has been replaced with a goto to a proper error
recovery which does the correct thing.

Also, refactored fsg_common_release() function.
Signed-off-by: NMichal Nazarewicz <mina86@mina86.com>
Reviewed-by: NViral Mehta <viral.mehta@lntinfotech.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Obviously, {} is needed in the branch of
	"else if (hcd->driver->flags & HCD_LOCAL_MEM)"
for handling of setup packet mapping.
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

An undocumented "feature" in the OMAP3 EHCI controller causes
suspended ports to be taken out of suspend when the USBCMD.Run/Stop
bit is cleared (this bit is normally cleared when ehci_bus_suspend
is called).

This "feature" breaks suspend-resume if the root-hub is allowed
to suspend. (The controller thinks it is in resume, and the PHY
thinks it is still in suspend).

There is an undocumented register bit that can be used to disable
this feature and restore normal behavior. Set this bit so
suspend-resume can work normally.

Tested on OMAP3 SDPs with the NXP ISP1504 and NXP ISP1703 PHYs.
Signed-off-by: NAnand Gadiyar <gadiyar@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as1379) reworks the logic for handling USB interface
runtime-PM settings -- hopefully it's right this time!  The problem is
that when a driver is unbound or binding fails, runtime PM for the
interface always gets disabled.  But pm_runtime_disable() nests, so it
shouldn't be called unless the interface was previously enabled for
runtime PM.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Reported-by: NRob Duncan <Robert.Duncan@exar.com>
Tested-by: NRob Duncan <Robert.Duncan@exar.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Macro TRB_TYPE is misused in some places. Fix the wrong usage.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Cc: stable <stable@kernel.org>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Change transfer ring behavior to not follow/activate link TRBs
until active TRBs are queued after it.  This change affects
the behavior when a TD ends just before a link TRB.
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Fix g_ffs build error, add a needed header file:

drivers/usb/gadget/f_fs.c:1064:error: 'PAGE_CACHE_SIZE' undeclared (first use in this function)
drivers/usb/gadget/f_fs.c:1065:error: 'PAGE_CACHE_SHIFT' undeclared (first use in this function)
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NMichał Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

On OMAP systems, we have two different OHCI controllers. The legacy
one is present in OMAP1/2 chips, and the newer one comes bundled as
a companion to the EHCI controller on OMAP3 and newer chips.

We may have multi-omap configurations where OMAP2 and OMAP3
support may be enabled in the same kernel, and need a mechanism
to keep both drivers around.

This patch adds a Kconfig entry for each of these drivers.
Signed-off-by: NAnand Gadiyar <gadiyar@ti.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Add support for the OHCI controller present in OMAP3 and newer chips.

The code is mostly based off the ehci-omap.c driver.
Some of it is common to both drivers and will eventually
need to be factored out to platform init files.

In its current state, the driver cannot co-exist with the ehci-omap
driver, and this will be fixed in later versions. The second driver
to be loaded will overwrite settings made by the other. For now,
this driver should allow the few users of OMAP3 OHCI to get going.
Signed-off-by: NAnand Gadiyar <gadiyar@ti.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Add platform init code for the OMAP3 OHCI driver.

Also, configure padconf settings for OMAP3 depending
on which port mode is used.
Signed-off-by: NAnand Gadiyar <gadiyar@ti.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

renamed fsl_mx3_udc.c -> fsl_mxc_udc.c
for mx51, usb core is clocked from sources that are not 60mhz.
Signed-off-by: NDinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Reverse priority of errors reported to ldisc so that it matches that of
other serial drivers (break takes precedence over parity, which takes
precedence over framing errors).

Also make sure overrun errors are handled as in other drivers, that is,
an overrun error is always reported and is not associated with any
received character (instead a NULL character with the TTY_OVERRUN flag
set is inserted).
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Use tty_insert_flip_string_fixed_flag to report errors to line
discipline.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Use tty_insert_flip_string_fixed_flag to report errors to line
discipline.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

There were some reports[1] of isp1760 USB driver malfunctioning
with high speed devices, noticed on Blackfin and PowerPC targets.
These reports indicated that the original Philips 'pehcd'[2]
driver worked fine.

We've noticed the same issue with an ARM RealView platform. This
happens under load (with only some mass storage devices, not all,
just as in another report[3]):

  error bit is set in DW3
  error bit is set in DW3
  error bit is set in DW3
  usb 1-1.2: device descriptor read/64, error -32

It appears that the 'pehcd' driver checks the X bit only if the
transaction is halted (H bit), otherwise the error is so far
insignificant.

The ISP176x chips were modeled after EHCI, and EHCI spec says
(thanks to Alan Stern for pointing out):

"Transaction errors cause the status field to be updated to reflect
 the type of error, but the transaction continues to be retried until
 the Active bit is set to 0.  When the error counter reaches 0, the
 Halt bit is set and the Active bit is cleared."

So, just as the original Philips driver, isp1760 must report the
error only if the transaction error and the halt bits are set.

[1] http://markmail.org/message/lx4qrlbrs2uhcnly
[2] svn co svn://sources.blackfin.uclinux.org/linux-kernel/trunk/drivers/usb/host -r 5494
    See pehci.c:pehci_hcd_update_error_status().
[3] http://blackfin.uclinux.org/gf/tracker/5148Signed-off-by: NAnton Vorontsov <avorontsov@mvista.com>
Acked-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

When USB3 protocol port detects an USB3.0 device attach, the port will
automatically transition to the Enabled state upon the completion
of successful link training.

Do not disable USB3 protocol ports in hub_activate(), or USB3.0 device
will fail to be recognized if xHCI bus power management is implemented.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Use process_read_urb to implement read processing.

Compile-only tested.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Acked-by: NBart Hartgers <bart.hartgers@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Fix regression introduced by commit
a108bfcb (USB: tty: Prune uses of
tty_request_room in the USB layer) which broke three drivers
(cypress_m8, digi_acceleport and spcp8x5) through incorrect use of
tty_insert_flip_string_fixed_flag.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Cc: stable <stable@kernel.org>  [.34]
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This is a patch that makes sure that the device ID data (idVendor,
idProduct and bcdDevice) are assigned to the descriptor in the cdev
structure *before* the composite gadget starts binding. This allows the
composite driver, and all the composite functions it uses, access to
that data.

In one of the composite functions we created, we needed to register an
input device and wanted to use the idVendor, idProduct and bcdDevice
codes to properly initialize the id field of the input device. We could
not do that because the idVendor, idProduct and bcdDevice values were
only set in the cdec structure *after* the composite->bind(cdev) call.
Signed-off-by: NRobert Lukassen <robert.lukassen@tomtom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Fix gcc warning on mixed declarations/code:
drivers/usb/host/u132-hcd.c:1450: warning: ISO C90 forbids mixed declarations and code
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

After using state stored in xhci_virt_ep to clean up a stalled endpoint,
be sure to set the stalled stream ID back to 0.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The FunctionFS gadget may provide the source/sink interface
not as the first interface (with id == 0) but some different
interface hence a code to find the interface number is
required.

(Note that you will still configure the gadget to report
idProduct == 0xa4a4 (an "echo 0xa4a4
>/sys/module/g_ffs/parameters/usb_product" should suffice) or
configure host to handle 0x0525:0xa4ac devices using the
usbtest driver.)
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The testusb program just issues ioctls to perform the tests
implemented by the kernel driver.  It can generate a variety
of transfer patterns; you should make sure to test both regular
streaming and mixes of  transfer sizes (including short transfers).

For more information on how this can be used and on USB testing
refer to <URL:http://www.linux-usb.org/usbtest/>.
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This adds an example user-space FunctionFS driver which
implements a source/sink interface used for testing.
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The Function Filesystem (FunctioFS) lets one create USB
composite functions in user space in the same way as GadgetFS
lets one create USB gadgets in user space.  This allows
creation of composite gadgets such that some of the functions
are implemented in kernel space (for instance Ethernet, serial
or mass storage) and other are implemented in user space.
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The FunctionFS is a USB composite function that can be used
with the composite framework to create an USB gadget.

>From kernel point of view it is just a composite function with
some unique behaviour.  It may be added to an USB
configuration only after the user space driver has registered
by writing descriptors and strings (the user space program has
to provide the same information that kernel level composite
functions provide when they are added to the configuration).

>From user space point of view it is a file system which when
mounted provide an "ep0" file.  User space driver need to
write descriptors and strings to that file.  It does not need
to worry about endpoints, interfaces or strings numbers but
simply provide descriptors such as if the function was the
only one (endpoints and strings numbers starting from one and
interface numbers starting from core).  The FunctionFS changes
numbers of those as needed also handling situation when
numbers differ in different configurations.

When descriptors and strings are written "ep#" files appear
(one for each declared endpoint) which handle communication on
a single endpoint.  Again, FunctionFS takes care of the real
numbers and changing of the configuration (which means that
"ep1" file may be really mapped to (say) endpoint 3 (and when
configuration changes to (say) endpoint 2)).  "ep0" is used
for receiving events and handling setup requests.

When all files are closed the function disables itself.
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

__init, __initdata and __exit tags have have been removed from
various files to make it possible for gadgets that do not use
the __init/__exit tags to use those.

Files in question are related to:
* the core composite framework,
* the mass storage function (fixing a section mismatch) and
* ethernet driver (ACM, ECM, RNDIS).
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch modifies the fs/timerfd.c to use the newly created
wait_event_interruptible_locked_irq() macro.  This replaces an open
code implementation with a single macro call.
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

New wait_event_interruptible{,_exclusive}_locked{,_irq} macros added.
They work just like versions without _locked* suffix but require the
wait queue's lock to be held.  Also __wake_up_locked() is now exported
as to pair it with the above macros.

The use case of this new facility is when one uses wait queue's lock
to  protect a data structure.  This may be advantageous if the
structure needs to be protected by a spinlock anyway.  In particular,
with additional spinlock the following code has to be used to wait
for a condition:

spin_lock(&data.lock);
...
for (ret = 0; !ret && !(condition); ) {
	spin_unlock(&data.lock);
	ret = wait_event_interruptible(data.wqh, (condition));
	spin_lock(&data.lock);
}
...
spin_unlock(&data.lock);

This looks bizarre plus wait_event_interruptible() locks the wait
queue's lock anyway so there is a unlock+lock sequence where it could
be avoided.

To avoid those problems and benefit from wait queue's lock, a code
similar to the following should be used:

/* Waiting */
spin_lock(&data.wqh.lock);
...
ret = wait_event_interruptible_locked(data.wqh, (condition));
...
spin_unlock(&data.wqh.lock);

/* Waiting exclusively */
spin_lock(&data.whq.lock);
...
ret = wait_event_interruptible_exclusive_locked(data.whq, (condition));
...
spin_unlock(&data.whq.lock);

/* Waking up */
spin_lock(&data.wqh.lock);
...
wake_up_locked(&data.wqh);
...
spin_unlock(&data.wqh.lock);

When spin_lock_irq() is used matching versions of macros need to be
used (*_locked_irq()).
Signed-off-by: NMichal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

g_webcam uses v4l[2] interfaces, so it should depend on VIDEO_DEV.

ERROR: "v4l2_event_unsubscribe" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_event_queue" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_device_release" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_usercopy" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_event_dequeue" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_register_device" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_device_alloc" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_event_subscribe" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_unregister_device" [drivers/usb/gadget/g_webcam.ko] ndefined!
ERROR: "v4l2_event_pending" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_fh_init" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_event_init" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "video_devdata" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_event_alloc" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_fh_add" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_fh_del" [drivers/usb/gadget/g_webcam.ko] undefined!
ERROR: "v4l2_fh_exit" [drivers/usb/gadget/g_webcam.ko] undefined!
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Remove multi-urb write from the generic driver and simplify the
prepare_write_buffer prototype:

	int (*prepare_write_buffer)(struct usb_serial_port *port,
						void *dest, size_t size);

The default implementation simply fills dest with data from port write
fifo but drivers can override it if they need to process the outgoing
data (e.g. add headers).

Turn ftdi_sio into a generic fifo-based driver, which lowers CPU usage
significantly for small writes while retaining maximum throughput.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Reimplement fifo-based writes in the generic driver using a multiple
pre-allocated urb scheme.

In contrast to multi-urb writes, no allocations (of urbs or buffers) are
made during run-time and there is less pressure on the host stack
queues as currently only two urbs are used (implementation is generic
and can handle more than two urbs as well, though).

Initial tests using ftdi_sio show that the implementation achieves the
same (maximum) throughput at high baudrates as multi-urb writes. The CPU
usage is much lower than for multi-urb writes for small write requests
and only slightly higher for large (e.g. 2k) requests (due to extra copy
via fifo?).

Also outperforms multi-urb writes for small write requests on an
embedded arm-9 system, where multi-urb writes are CPU-bound at high
baudrates (perf reveals that a lot of time is spent in the host stack
enqueue function -- could perhaps be a bug as well).

Keeping the original write_urb, buffer and flag for now as there are
other drivers depending on them.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Kill circular buffers for tx and rx as well as read work thread, and
switch to generic kfifo-based write implementation.

This is an example of how prepare_write_buffer and process_read_urb can
be used to handle protocols with packet headers.

Please note the diffstat which shows that the same functionality is now
provided using only a tenth of the code (including whitespace and
comments, though).
Tested-by: NNaranjo, Manuel Francisco <naranjo.manuel@gmail.com>
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The original SIO devices require a control byte for every packet
written. Clean up the unnecessarily messy implementation of this.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Switch to the generic, multi-urb, write implementation.

Note that this will also make it fairly easy to use the generic
fifo-based write implementation: simply unset the multi_urb_write flag
and modify prepare_write_buffer (or unset if not using a legacy SIO
device). This may be desirable for instance on an embedded system where
optimal throughput at high baudrates may not be as important as other
factors (e.g. no allocations during runtime and less pressure on host
stack).
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Use the resource_size function instead of manually calculating the
resource size.  This reduces the chance of introducing off-by-one
errors.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as1377) simplifies the code in usb_sg_init(), without
changing its functionality.  It also removes a couple of unused fields
from the usb_sg_request structure.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>