Added macros EM28XX_START_AUDIO and EM28XX_STOP_AUDIO for em28xx_cmd().
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Patch removes printk and place em28xx_errdev macros to provide
information about driver name to dmesg.
Signed-off-by: NAlexey Klimov <klimov.linux@gmail.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Added lock for users count
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Added spinlock for trigger session
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Essentially if a snd_em28xx_capture_trigger() stop followed by a snd_em28xx_capture_trigger() start would not yield any
data because there was some logic put in with an adev->shutdown variable which did not seem warranted in my humble opinion.
It would cause snd_em28xx_capture_trigger start never to start up the audio stream until the device was closed and
reopened again. Upon re-opening the device adev->shutdown is reset and audio data would again flow.
Signed-off-by: NRobert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Fix for em28xx memory leak and function rename
Signed-off-by: NRobert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Removed bad check. Thanks to Robert Krakora <rob.krakora@messagenetsystems.com>
to report that.
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Just call em28xx_isoc_audio_deinit() if em28xx sent a usb_submit().
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

As explained in "Writing an ALSA driver" (T. Iwai), audio drivers should
set the struct device for the card before registering the card instance.
This will add the correct /sys/class/sound/cardN/device symlink, so HAL
can see the device and ConsoleKit sets its ACL permissions for the
logged-in user.

For em28xx audio capture cards found e.g. in Hauppauge WinTV-HVR-900 (R2),
this patch fixes errors like:

ALSA lib pcm_hw.c:1429:(_snd_pcm_hw_open) Invalid value for card
Error opening audio: Permission denied

when running mplayer as a normal user.
Signed-off-by: NNicola Soranzo <nsoranzo@tiscali.it>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Trace:  (Provided by Douglas)

BUG: sleeping function called from invalid context at drivers/usb/core/urb.c:558
in_atomic():0, irqs_disabled():1
Pid: 4918, comm: sox Not tainted 2.6.27.5 #1
 [<c04246d8>] __might_sleep+0xc6/0xcb
 [<c058c8b0>] usb_kill_urb+0x1a/0xd8
 [<c0488e68>] ? __kmalloc+0x9b/0xfc
 [<c0488e85>] ? __kmalloc+0xb8/0xfc
 [<c058cd5a>] ? usb_alloc_urb+0xf/0x31
 [<f8dd638c>] em28xx_isoc_audio_deinit+0x2f/0x6c [em28xx_alsa]
 [<f8dd6573>] em28xx_cmd+0x1aa/0x1c5 [em28xx_alsa]
 [<f8dd65e1>] snd_em28xx_capture_trigger+0x53/0x68 [em28xx_alsa]
 [<f8aa8674>] snd_pcm_do_start+0x1c/0x23 [snd_pcm]
 [<f8aa85d7>] snd_pcm_action_single+0x25/0x4b [snd_pcm]
 [<f8aa9833>] snd_pcm_action+0x6a/0x76 [snd_pcm]
 [<f8aa98f5>] snd_pcm_start+0x14/0x16 [snd_pcm]
 [<f8aae10e>] snd_pcm_lib_read1+0x66/0x273 [snd_pcm]
 [<f8aac5a3>] ? snd_pcm_kernel_ioctl+0x46/0x5f [snd_pcm]
 [<f8aae4a7>] snd_pcm_lib_read+0xbf/0xcd [snd_pcm]
 [<f8aad774>] ? snd_pcm_lib_read_transfer+0x0/0xaf [snd_pcm]
 [<f89feeb6>] snd_pcm_oss_read3+0x99/0xdc [snd_pcm_oss]
 [<f89fef9c>] snd_pcm_oss_read2+0xa3/0xbf [snd_pcm_oss]
 [<c064169d>] ? _cond_resched+0x8/0x32
 [<f89ff0be>] snd_pcm_oss_read+0x106/0x150 [snd_pcm_oss]
 [<f89fefb8>] ? snd_pcm_oss_read+0x0/0x150 [snd_pcm_oss]
 [<c048c6e2>] vfs_read+0x81/0xdc
 [<c048c7d6>] sys_read+0x3b/0x60
 [<c04039bf>] sysenter_do_call+0x12/0x34
 =======================

The culprit in the trace is snd_pcm_action() which invokes a spin lock
which disables pre-emption which disables an IRQ which causes the
__might_sleep() function to fail the irqs_disabled() test.  Since
pre-emption is enabled then it is safe to de-allocate the memory if
you first unlink each URB.  In this instance you are safe since
pre-emption is disabled.  If pre-emption and irqs are not disabled then
call usb_kill_urb(), else call usb_unlink_urb().

Thanks to Douglas for tracking down this bug originally!!!

[dougsland@redhat.com: Fixed codyingstyle]
Signed-off-by: NRobert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Revert a change made in change 9743 which resulted in a kernel panic in some
cases on shutdown of the audio stream.

First discovered when working on the Pinnacle 880e support, and later
reproduced by a user on the mailing list with the HVR-900 as well.
Signed-off-by: NDevin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

em28xx: Fix audio URB transfer buffer memory leak and race
condition/corruption of capture pointer

Leak fix kindly contributed by Pádraig Brady.
Signed-off-by: NRobert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Convert from snd_card_new() to the new snd_card_create() function.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Some devices require different setups on struct_audio. Due to that, we
may need to change some fields at dev.adev during device probe. So, this
patch moves the dynamic memory allocation of adev at em28xx-alsa to the
dynamic allocation of struct em28xx dev that happens during device
probe.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Rework the logic so that the em28xx-alsa module does not get loaded for devices
that don't support analog audio (such as the em2874)
Signed-off-by: NDevin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Remove unused variable from em28xx-audio.c

Fix warning for unused "ret" variable
Signed-off-by: NDevin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

commit 50f3beb5 fixed em28xx-alsa
locking schema. However, a backport macro was kept.

This patch removes the macro, since it is not needed for the module
compilation against upstream.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Replaced usb_kill_usb for usb_unlink_usb
(wait until urb to fully stop require USB core to put the calling process to sleep).

Oops:
http://www.kerneloops.org/raw.php?rawid=71799&msgid=Signed-off-by: NDouglas Schilling Landgraf <dougsland@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Instead of using a spinlock, it is better to call the proper pcm stream
locking schema.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Fixed audio clicking problem which could be heard when using analog tv or composite input
Signed-off-by: NWiktor Grebla <greblus@gmail.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Free allocated memory
Signed-off-by: NDouglas Schilling Landgraf <dougsland@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

On some alsa versions, it seems that snd_pcm_substream_chip(substream)
is returning a NULL pointer. This causes an OOPS, as reported by:

https://bugs.launchpad.net/ubuntu/+source/linux-ubuntu-modules-2.6.24/+bug/212271
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/212960

This patch avoids the OOPS by not letting and open() succeed.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

em28xx-audio.c
em28xx-dvb.c
 - Em28xx extensions should ensure they are being only loaded against devices
   that support them.  Deals with case where there are multiple em28xx
   devices, some of which have DVB (or ALSA) support and some do not.
Signed-off-by: NDevin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

__FUNCTION__ is gcc-specific, use __func__
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

sound/driver.h is already included by sound/core.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Older em28xx devices does implement standard Audio Class.

However, on newer devices, this were replaced by a Vendor Class. This
patch autodetects that an em28xx lacks Audio Class and auto-loads
em28xx-alsa, for the devices that implements only a Vendor Class.

For devices with Audio Class, snd-usb-audio module will provide an ALSA
interface.

This patch uses the request_module_async function as defined on cx88-mpeg.c, 
originally wrote by Markus Rechberger.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Also fixes the remaining CodingStyle issues that Lindent didn't fix.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

em28xx-audio module exports em28xx Vendor Class audio as an -alsa
driver. This module were written based on usbaudio driver by Markus
Rechberger. Recently, he acked to allow us to merge it on kernel:

http://lists-archives.org/video4linux/20408-supporting-prolink-pixelview-405-dvd-maker.html

Thanks to Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>