Improve error handling in mgmt load_keys()
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Improve error handling at cmd_status() and cmd_complete()
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

We need to catch errors when calling hci_add_sysfs() and return them to
the caller to avoid kernel oopses on device_add() failure.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

As we introduced hci_init_sysfs() we should also rename
hci_register_sysfs() and hci_unregister_sysfs() to hci_add_sysfs() and
hci_del_sysfs() like we do with hci_conn_add/del_sysfs(). It looks more
consistent now.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

We must not call device_del() if we didn't use device_add(). See module.c
for comments on that. Therefore, we need to call device_initialize() when
allocating the hci device and later device_add() instead of
device_register().

This also fixes a bug when hci_register_dev() failed and we call
hci_free_dev() without a valid core device. hci_free_dev() segfaults while
calling put_device() on invalid memory.

We already do this with hci_conn connections (hci_conn_init_sysfs()) so
they do not need to be fixed.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Implementation of Read Local AMP Info Command
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Add Extended Flow Specification option when building L2CAP
Configuration Request. EFS is added if both the local and
remote L2CAP entities have indicated support for the
Extended Flow Specification for BR/EDR.

...
< ACL data: handle 1 flags 0x00 dlen 10
    L2CAP(s): Info req: type 2
> ACL data: handle 1 flags 0x02 dlen 16
    L2CAP(s): Info rsp: type 2 result 0
      Extended feature mask 0x01f8
        Enhanced Retransmission mode
        Streaming mode
        FCS Option
        Extended Flow Specification
        Fixed Channels
        Extended Window Size
...
< ACL data: handle 1 flags 0x00 dlen 45
    L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 33
      RFC 0x03 (Enhanced Retransmission, TxWin 63, MaxTx 3, RTo 0, MTo 0, MPS 498)
      EFS (Id 0x01, SerType Best Effort, MaxSDU 0xffff, SDUitime 0xffffffff,
          AccLat 0xffffffff, FlushTO 0x0000ffff)
...

Based upon haijun.liu <haijun.liu@atheros.com> series of patches
(sent Sun, 22 Aug 2010)
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Assign default EFS values when creating L2CAP channel
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Define Extended Flow Specification structures and default values.
Based upon haijun.liu <haijun.liu@atheros.com> series of patches
(sent Sun, 22 Aug 2010)
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Adds definitins for L2CAP header sizes to be uses when calculating
payload size instead of magic numbers.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Recalculate length of L2CAP header based on Control field length.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Handle POLL (P) bit in L2CAP ERTM using information about control field type.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Handle final (F) bit in L2CAP using information about control field type.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Check frame function uses now information about control field type.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

L2CAP ERTM txseq calculation uses now information about control field type.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

reqseq calculation uses now information about control field type.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Segmentation and Reassembly (SAR) occupies different windows in standard and
extended control fields. Convert hardcoded masks to relative ones and use shift
to access SAR bits.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Supervisory bits occupy different windows in standard / extended control
fields. Convert hardcoded masks to relative ones and use shift to access
S-bit window.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Adds extended control field bit masks and rearrange defines to logical
groups: masks, flags and shift groups.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Adds support for extended window size (EWS) config option. We enable EWS
feature in L2CAP Info RSP when hs enabled. EWS option is included in L2CAP
Config Req if tx_win (which is set via socket) bigger then standard default
value (63) && hs enabled && remote side supports EWS feature.

Using EWS selects extended control field in L2CAP.

Code partly based on Qualcomm and Atheros patches sent upstream a year ago.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

With 0444 it is impossible to change the param, changing it to 0644.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Spaces converted to tabs
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

role_switch variable inside l2cap_chan is a logical one and can
be easily converted to flag
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

force_active variable inside l2cap_chan is a logical one and can
be easily converted to flag
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

force_reliable variable inside l2cap_chan is a logical one and can
be easily converted to flag
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

flushable variable inside l2cap_chan is a logical one and can
be easily converted to flag. Added flags in l2cap_chan structure.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

There are still three calls of usb_submit_urb() that will print errors
if those calls return -EPERM or -ENODEV. I have never triggered these,
so I'm not sure when these return values might be seen. It still makes
sense to be silent if these occur (since "urb is being killed" and
"device got disconnected" aren't things to worry about).
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

usb_submit_urb() returns -ENODEV when a usb device is disconnected. In
commit 4935f1c1 ("Bluetooth: btusb: be
quiet on device disconnect") I stopped treating that return as an error
in the three btusb_*_complete() functions.

It turns out btusb_send_frame() generates a similar error if the system
is suspended while the bluetooth usb device is enabled. The sensible
thing to do here seems to be to treat -ENODEV (and -EPERM) just like the
btusb_*_complete() functions now do.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

hidp_get_connection() makes more sense because we hold a reference to the
connection inside this function.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

It gets allocated only when it is really needed.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Claim device lock to safely enumerate hci connection list and bump
hci connection proxy device ref count simultaneously.

This patch incorporates David Herrmann's fix to prevent adding an
HID device when the hci connection no longer exists.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

d458a9df add this check, but now it proves to be wrong.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

This is a regression fix. It made impossible use input device when hid
fails.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

interrupt channel is low latency.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Interrupt channel has low latency requiments, should be processed first.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

list_for_each_entry is much more meaningful.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Current hidp driver purges the in/out queue on HID shutdown, but does
not prevent further I/O. If a driver uses hidp_output_raw_report or
hidp_get_raw_report during shutdown, the driver hangs for 5 or 10
seconds per call until it gets a timeout.
That is, if the output queue of an HID driver has 10 messages pending,
it will take 50s until hid_destroy_device() will return. The
hidp_session_sem semaphore is held during shutdown so no other HID
device may be added/removed during this time.

This patch makes hidp_output_raw_report and hidp_get_raw_report fail if
session->terminate is true. Also hidp_session will wakeup all current
calls to these functions to cancel the current operations.

We already purge the current I/O queues on hidp_stop(), so this data loss
does not change the behaviour of the HID drivers.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Add enable_hs kernel parameter. L2CAP_FEAT_EXT_FLOW depends on it.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

Update L2CAP extended feature mask to reflect recent BT spec.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>