drivers/usb/gadget/at91_udc.c included 'linux/prefetch.h' twice,
remove the duplicate.
Signed-off-by: NDanny Kukawka <danny.kukawka@bisect.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This is a flexible USB Audio Class 2.0 compliant gadget driver that
implements a simple topology with a virtual sound card exposed at
the function side.

The driver doesn't expect any real audio codec to be present on the
function - the audio streams are simply sinked to and sourced from a
virtual ALSA sound card created. The user-space application may choose
to do whatever it wants with the data received from the USB Host and
choose to provide whatever it wants as audio data to the USB Host.

Capture(USB-Out) and Playback(USB-In) can be run at independent
configurations specified via module parameters while loading the driver.

Make this new version as the default selection by a new Kconfig choice.
Signed-off-by: NYadi Brar <yadi.brar01@gmail.com>
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Move manufacturer and product string ids into audio.c so
as to be reusable by the new uac2 version of gadget driver.
Signed-off-by: NYadi Brar <yadi.brar01@gmail.com>
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The extant USB-Audio function driver complies to UAC_1 spec.
So name the files accordingly, paving way for inclusion of
a new UAC_2 specified driver.
Signed-off-by: NYadi Brar <yadi.brar01@gmail.com>
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This patch adds SS descriptors to the ACM & generic serial gadget. The
ACM part was tested with minicom + dummy + send / receive files over
ttyACM <=> ttyGS0.
The generic serial part (f_serial) was not tested (haven't found a
driver on the host side).
The nokia & multi gadget use HS at most.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Since commit 72c973dd aka ("usb: gadget: add usb_endpoint_descriptor to
struct usb_ep) the descriptor is part of the ep. Most gadgets like
g_zero or masstorage call config_ep_by_speed() to grab an available
endpoint which may be used for FS/HS/SS bulk/iso/intr and in a second
they assign the proper descriptor by calling config_ep_by_speed(). This
is good so far. A few of them like ncm call config_ep_by_speed() only if
ep->desc not assigned earlier. That means ep->desc is never assigned if
the endpoint was used by another gadget before it was removed.

Some of those gadgets also assign ep->driver_data to NULL on reset or
ep_disable part _but_ keep a reference to this endpoint. At ep_enable
time they assign driver_data to their private data. This probably needs
a clean up of its own.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Problem:
 pch_udc continues operation even if VBUS becomes Low.
 pch_udc performs D+ pulling up before VBUS becomes High.
 USB device should be controlled according to VBUS state.

Root cause:
 The current pch_udc is not always monitoring VBUS.

Solution:
 The change of VBUS is detected using an interrupt of GPIO.
 If VBUS became Low, pch_udc handles 'disconnect'.
 After VBUS became High, a pull improves D+, and pch_udc
 handles 'connect'.

[ balbi@ti.com : make it actually compile ]
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Problem:
 In USB Suspend, pch_udc handles 'disconnect'.

Root cause:
 The current pch_udc is not monitoring VBUS.
 When USB cable is disconnected, USB Device Controller generates
 an interrupt of USB Suspend.
 pch_udc cannot distinguish it is USB Suspend or disconnect.
 Therefore, pch_udc handles 'disconnect' after an interrupt of
 USB Suspend happend.

Solution:
 VBUS is detected through GPIO.
 After an interrupt produced USB Suspend, if VBUS is Low,
 pch_udc handles 'disconnect'.
 If VBUS is High, pch_udc handles 'suspend'.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

_ep to ep is a pointer substraction so ep won't be zero unless _ep was
8. This was not intendent by the author, it was probably a typo while
checking for NULL of the argument.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If the stream check fails then we leave ep->desc assigend but we return
with an error code. The caller assumes the endpoint is not enabled
(which is the case) but it can not enable it again due to this
assigment.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Add IAD to bind the two interfaces of ECM so that it works properly
in composite gadget mode.
Signed-off-by: NThirupathi <thirupathi.chippakurthy@stericsson.com>
Signed-off-by: NPraveena Nadahally <praveen.nadahally@stericsson.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Remove one define of FSG_NO_INTR_EP and we still have that we can use.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The m.nazarewicz@samsung.com email address is no longer valid,
so this commit replaces it with mina86@mina86.com which is
employer-agnostic and thus should be valid for foreseeable
feature.
Signed-off-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This patch converts checkpatch output of
|./scripts/checkpatch.pl drivers/usb/gadget/dummy_hcd.c -file

from
|total: 22 errors, 174 warnings, 2642 lines checked

to
|total: 0 errors, 0 warnings, 2632 lines checked
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This patch makes use of usb_endpoint_type() instead of the open coding.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

dummy_hcd provides (alloc|free)_stream() callbacks but there are not
doing anything. The transfer side also lacks matching of streams. This
patch changes this and implements stream allocation / de-allocation
support and proper urb <=> req matching.
The UDC side exposes a limit of 16 streams. DWC3, the only USB3 UDC has
no limitations in this regard except that it _needs_ to know that
streams will be used at the ep_enable time. At the host side, there is
no real limit either: XHCI can allocate any number of streams as long as
it does not run out of memory. The UAS gadget currently requests 16
streams and the UAS host side fallbacks from the requested 256 down to
16 which is fine.
From the UASP point of view (the only specified user), the number of
used streams does not really matter. The only limitation is that the
host may not use a higher stream than the gadget requested and can deal
with.

The dummy stream support has been modelled after current UAS + XHCI +
DWC3 + UASP usage which helps me testing:
- the device announces that each ep supports 16 streams (even it could
  more than that).
- the device side looks into Companion descriptor at ep_enable time and
  enables them according to it.
- the host side tries to enable the requested number of streams but the
  upper limit is the Comanion descriptor. None (zero streams) is an
  error condition, less is okay.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
Adding debugging messages.

CAUSE:
The debugging messages are added to make sure of that major interrupt events
are occurring.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
USB Suspend interrupts occur frequently.

CAUSE:
When it is called pch_udc_reconnect() in USB Suspend, it repeats reset and
Suspend.

SOLUTION:
pch_udc_reconnect() does not enable all interrupts.  When an enumeration event
occurred the driver enables all interrupts.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
After a USB cable is connect/disconnected, the system rarely freezes.

CAUSE:
Since the USB device controller cannot know to disconnect the USB cable, when
it is used without detecting VBUS by GPIO, the UDC driver does not notify to
USB Gadget.

Since USB Gadget cannot know to disconnect, a false setting occurred when the
USB cable is connected/disconnect repeatedly.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
After USB Suspend, a system rarely freezes.

CAUSE:
When USB Suspend occurred, the driver is not notifying
a gadget of the event.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
If the return value of pch_udc_pcd_init() is False, the return value of
this function is unsettled.
Since pch_udc_pcd_init() always returns 0, there is not actually the issue.

CAUSE:
If pch_udc_pcd_init() is True, the variable, retval, is not set for an
appropriate value.
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ISSUE:
When the driver notifies a gadget of a disconnect event, a system
rarely freezes.

CAUSE:
When the driver calls dev->driver->disconnect(), it is not calling
spin_unlock().
Signed-off-by: NTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This will enable the system to check for activity of the usb gadget
and also in a later patch to control the usbphy power-domain.
When handling the power domain there, it will be possible to remove
another reference to architecture code.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The helper functions were definied but never used until now.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We've dereferenced req already, and we checked for bogus parameters at
the start of the function.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

There is no reason why dummy_alloc_streams() and dummy_free_streams()
are global. Make them static instead.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This renames a function so "update" is spelled properly.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This patch adds sg support to dummy_hcd. It seems that uas is not able
to work with a hcd which does not support sg only based transfers.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This patch moves the part of the code which does the bare transfer into
its function. It is a preparion for the implementation of sg support.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

While playing with uasp I noticed that it does not work with dummy_hcd.
The problem is that uasp requires a stream capable endpoint which it is
requesting at bind time like every other gadget. dummy_hcd however
initializes the max_stream value after connect once it knows if it runs
at SS or not.
I don't think that it is might be wrong to initialize the stream
capability even at HS speed. The gadget may not use this descriptor at
HS speed so it should not cause any damage.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

module_param(bool) used to counter-intuitively take an int.  In
fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy
trick.

It's time to remove the int/unsigned int option.  For this version
it'll simply give a warning, but it'll break next kernel version.
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

* if you do dput() of root dentry, do *not* follow that with iput() of root
inode.
* while we are at it, don't do that dput() at all - you are leaving the pointer
in ->s_root and your ->kill_sb() will be very unhappy with that.  It will do
proper dput(), though, so the easiest way is to leave that to it entirely.
* freeing ->s_fs_info is also best left to ->kill_sb() (which will do it
anyway), especially since we leave the pointer in place.
* that xchg() in ->kill_sb() is not a bug per se, but it's a plain and simple
masturbation with fewer excuses than Onan had...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Where are inside an 'if USB_GADGET'.
Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Instead use container_of to retrieve the s3c_hsudc from the
struct usb_gadget pointer.

[ balbi@ti.com : changed verbose container_of() into
	an already provided helper 'to_hsudc()' ]
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

As the memory region is requested through request_mem_region
use the correct paired method to release it in the error path
and don't go "beneath the API".
Reported-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The udc has three supplies: vdda (3.3V), vddi (1.2V) and vddosc (1.8-3.3V).
Turn these on and off on start and stop calls.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Reviewed-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

udc_start and udc_stop reduce code duplication in comparison to
start and stop generalising calls done by all drivers
(i.e. bind and unbind) and moving these calls to common code.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Instead of adding and deleting the gadget device in the start and stop
invocations. Use device_register in the probe method to initialize
and add the gadget device.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>