linux.git/drivers/input/misc/pcspkr.c, branch v2.6.29

Input: pcspkr - fix PIT lockup on some chipsets

2008-11-19T21:54:59+00:00

There've been reports [1] about the sysem bell causing a hard
lockup.  My machine was affected as well: any speaker output hung
the machine completely, nothing in the logs, no magic sysrq,
etc., looked like a hardware problem.  Had a closer look on the
issue, and it turned out that the pcspkr module is responsible.
The cause is the bad setup of Timer 2 in the i8253 controller,
which probably hangs the whole PIT controller.

Intel datasheets [2] state that the timer registers are in an
undefined state after reset and they need to be programmed before
enabling the timer. (And enabling without programming the
frequency first doesn't make sense anyway).

I don't know which chipsets are affected (if not all), it also
depends on the BIOS whether it initializes the timer (e.g. to
beep when you start the machine).

The following patch solved the issue on my ICH6 notebook,
couldn't test it with any others, but should be safe to apply.

[1]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/146151
https://bugs.launchpad.net/ubuntu/+bug/270790
http://ubuntuforums.org/showthread.php?t=227693
http://bugs.gentoo.org/show_bug.cgi?id=222583
https://bugzilla.redhat.com/show_bug.cgi?id=454225

[2]
http://www.intel.com/assets/pdf/datasheet/252516.pdf
http://www.intel.com/assets/pdf/datasheet/301473.pdf
http://www.intel.com/design/chipsets/datashts/29065503.pdf

Signed-off-by: Zoltan Devai 
Signed-off-by: Dmitry Torokhov

Use i8253.c lock for PC speaker on MIPS, too.

2007-11-03T02:39:18+00:00

The Jazz machines have to use the PIT timer for dyntick and highresolution
kernels.  This may break because currently just like i386 used to do MIPS
uses two separate spinlocks in the actual PIT code and the PC speaker
code.  So switch to do it the same that x86 currently does PIT locking.

Signed-off-by: Ralf Baechle 
Signed-off-by: Linus Torvalds

get rid of input BIT* duplicate defines

2007-10-19T18:53:42+00:00

get rid of input BIT* duplicate defines

use newly global defined macros for input layer. Also remove includes of
input.h from non-input sources only for BIT macro definiton. Define the
macro temporarily in local manner, all those local definitons will be
removed further in this patchset (to not break bisecting).
BIT macro will be globally defined (1<
Cc: 
Acked-by: Jiri Kosina 
Cc: 
Acked-by: Marcel Holtmann 
Cc: 
Acked-by: Mauro Carvalho Chehab 
Cc: 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6

2007-10-12T22:49:37+00:00

* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6: (75 commits)
  PM: merge device power-management source files
  sysfs: add copyrights
  kobject: update the copyrights
  kset: add some kerneldoc to help describe what these strange things are
  Driver core: rename ktype_edd and ktype_efivar
  Driver core: rename ktype_driver
  Driver core: rename ktype_device
  Driver core: rename ktype_class
  driver core: remove subsystem_init()
  sysfs: move sysfs file poll implementation to sysfs_open_dirent
  sysfs: implement sysfs_open_dirent
  sysfs: move sysfs_dirent->s_children into sysfs_dirent->s_dir
  sysfs: make sysfs_root a regular directory dirent
  sysfs: open code sysfs_attach_dentry()
  sysfs: make s_elem an anonymous union
  sysfs: make bin attr open get active reference of parent too
  sysfs: kill unnecessary NULL pointer check in sysfs_release()
  sysfs: kill unnecessary sysfs_get() in open paths
  sysfs: reposition sysfs_dirent->s_mode.
  sysfs: kill sysfs_update_file()
  ...

platform: prefix MODALIAS with "platform:"

2007-10-12T21:50:59+00:00

Prefix platform modalias strings with "platform:", which
modprobe config to blacklist alias resolving if userspace
configures it.

Send uevents for all platform devices.

Add MODULE_ALIAS's to: pxa2xx_pcmcia, ds1742 and pcspkr to trigger
module autoloading by userspace.

  $ modinfo pcspkr
  alias:          platform:pcspkr
  license:        GPL
  description:    PC Speaker beeper driver
  ...

  $ modprobe -n -v platform:pcspkr
  insmod /lib/modules/2.6.23-rc3-g28e8351a-dirty/kernel/drivers/input/misc/pcspkr.ko

Signed-off-by: Kay Sievers 
Cc: David Brownell 
Cc: Atsushi Nemoto 
Signed-off-by: Greg Kroah-Hartman

x86: kill 8253pit.h

2007-10-12T21:04:23+00:00

Useless header file with 32 bit and 64 bit variants. Move the
single useful line to the place where it is used.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar 
Signed-off-by: Arjan van de Ven

x86_64: use the global PIT lock

2007-07-22T01:37:12+00:00

Replace the pcspkr private PIT lock by the global PIT lock to serialize the
PIT access all over the place.

Signed-off-by: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: Dmitry Torokhov 
Signed-off-by: Andrew Morton 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

Input: misc devices - switch to using input_dev->dev.parent

2007-04-12T05:35:32+00:00

In preparation for struct class_device -> struct device input
core conversion, switch to using input_dev->dev.parent when
specifying device position in sysfs tree.

Signed-off-by: Dmitry Torokhov

Input: pcspkr - separate device and driver registration

2006-03-14T05:11:50+00:00

The current pcspkr code combines the device and driver registration.
This patch splits these, putting the device registration in the arch
specific code.

PowerPC and MIPS only have the pcspkr present sometimes.

Signed-off-by: Michael Neuling 
Signed-off-by: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Dmitry Torokhov

Input: pcspkr - register with driver core as a platfrom device

2005-12-21T05:52:22+00:00

Signed-off-by: Dmitry Torokhov