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Commit Graph

98926 Commits

Author SHA1 Message Date
Manuel Lauss
2373c1801a i2c-ocores: basic PM support
Basic PM support: reinit the core on resume, disable it on suspend.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:33 +02:00
Maciej W. Rozycki
392a0408fd i2c-sibyte: SWARM I2C board initialization
The standard rtc-m41t80.c driver cannot be used with the SWARM as it is,
because the board does not provide setup information for the I2C core.  
As a result the bus and the address to probe for the M41T80 chip is not
known.

 Here is a set of changes that fix the problem:

1. swarm-i2c.c -- SWARM I2C board setup, currently for the M41T80 chip on 
   the bus #1 only (there is a MAX6654 temperature sensor on the bus #0 
   which may be added in the future if we have a driver for that chip).

2. The i2c-sibyte.c BCM1250A SMBus controller driver now registers its 
   buses as numbered so that board setup is correctly applied.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:33 +02:00
Jean Delvare
cf898dc5e9 i2c-i801: Fix handling of error conditions
Move the check of pre-transaction and post-transaction conditions to
separate functions, and adjust them a bit. Having dedicated functions
for that ensures that errors are handled in a consistent way.

Bit HOST_BUSY of the status register is read-only, so writing to it is
certainly not going to clear it. If this bit is set then we simply
don't want to start the transaction, as it means that somebody else
(ACPI, SMM?) is already using the controller.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:33 +02:00
Jean Delvare
2b73809d06 i2c-i801: Rename local variable temp to status
"temp" isn't a terribly well chosen name for a local variable.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:32 +02:00
Jean Delvare
dcb5c9239d i2c-i801: Properly report bus arbitration loss
Bit BUS_ERR of the status register means that the ICH host controller
lost the arbitration. Report this event as such.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:32 +02:00
Jean Delvare
90df2cb1c8 i2c-i801: Remove verbose debugging messages
Dumping the register values before and after every transaction was
useful during driver development but now it's only spamming the log.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:32 +02:00
Jean Delvare
e3e7fc3c40 i2c-algo-pcf: Drop unused struct members
Struct members udelay and timeout aren't used anywhere, so drop them.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Eric Brower <ebrower@gmail.com>
2008-07-14 22:38:31 +02:00
Eric Brower
0573d11b2b i2c-algo-pcf: Multi-master lost-arbitration improvement
Improve lost-arbitration handling of PCF8584.  This is necessary for
support of a currently out-of-kernel driver for Sun Microsystems E250
environmental management; perhaps others.

Signed-off-by: Eric Brower <ebrower@gmail.com>
Acked-by: Dan Smolik <marvin@mydatex.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:31 +02:00
David Brownell
8a56ce1033 i2c: Deprecate the legacy gpio drivers
The legacy pcf8574 and pcf8575 drivers should be avoided
on systems using the new gpiolib code, and generally deprecated
in the same way the legacy pca9539 driver is deprecated.

Also, correct the pca9539 deprecation to match the current name
of the preferred driver:  pca953x, supporting several more chips.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:31 +02:00
Uli Luckas
47a9b1379a i2c-pxa: Initialize early
Initialize the pxa i2c bus during subsystem initialization to make it
available during driver initialization (e.g. display powerup for pxafb).

Signed-off-by: Uli Luckas <u.luckas@road.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:30 +02:00
Stefan Roese
d3dc685eb5 i2c-ibm_iic: Enable driver for all PPC4xx variants in arch/powerpc
Enable the IBM I2C driver for all PPC4xx variants by adding
"ibm,iic" to the compatible list. This way all currently available
arch/powerpc 4xx ports can make use of this driver without any changes.
Additionally all "other" compatible entries are removed since they are
not needed anymore.

Currently all 4xx PPC's have the same compatible I2C macro. If at some
time an incompatibility is detected we can take care of this with an
additional property.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:30 +02:00
Stefan Roese
e6c3de6c14 i2c-ibm_iic: Remove deprecated OCP style part
The deprecated OCP style driver part is used by the "old" arch/ppc
platform. This platform is scheduled for removal in June/July this year.
This patch now removes the OCP driver part from the IBM I2C driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:30 +02:00
Jean Delvare
e0457442fd i2c: Simplify i2c_device_probe
i2c_driver.id_table is mandatory now, so we can simplify
i2c_device_probe() a bit.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:30 +02:00
Jean Delvare
1b4dff9cd3 i2c/eeprom: Fall back to SMBus read word transactions
When I2C block reads are not supported by the underlying adapter, use
SMBus read word transactions instead of consecutive byte reads.
Reasons for this change are:

* The consecutive byte read approach is not safe on multi-master buses.

* While consecutive byte reads have less overhead if you only count the
  bytes on the bus, it takes more than twice as many transactions as
  with SMBus read word transactions, and each transaction has a cost:
  taking and releasing the adapter mutex, and for polling drivers,
  waiting for the transaction to complete.

This change yields a significant performance boost at HZ=250 with
EEPROMs on an Intel 82801 bus (basically twice as fast.)

SMBus read word transactions are widely supported so I don't expect
compatibility issues.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:29 +02:00
Jean Delvare
d4653bf946 i2c/eeprom: Only probe buses with DDC or SPD class
The eeprom driver shouldn't probe i2c buses which don't want to be
probed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:29 +02:00
Jean Delvare
3401b2fff3 i2c: Let bus drivers add SPD to their class
Let general purpose I2C/SMBus bus drivers add SPD to their class. Once
this is done, we will be able to tell the eeprom driver to only probe
for SPD EEPROMs and similar on these buses.

Note that I took a conservative approach here, adding I2C_CLASS_SPD to
many drivers that have no idea whether they can host SPD EEPROMs or not.
This is to make sure that the eeprom driver doesn't stop probing buses
where SPD EEPROMs or equivalent live.

So, bus driver maintainers and users should feel free to remove the SPD
class from drivers those buses never have SPD EEPROMs or they don't
want the eeprom driver to bind to them. Likewise, feel free to add the
SPD class to any bus driver I might have missed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:29 +02:00
Jean Delvare
c1b6b4f234 i2c: Let framebuffer drivers set their I2C bus class to DDC
Let framebuffer drivers set their I2C bus class to DDC. Once this is
done, we will be able to tell the eeprom driver to only probe for
EDID EEPROMs on these buses.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:28 +02:00
Jochen Friedrich
0d2b405a62 i2c: Add MAINTAINER entry for i2c-cpm
Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:28 +02:00
Wolfram Sang
3b270804a9 i2c-cpm: Bugfixes
Bugfixes to the i2c-cpm driver

- enable correct interrupts (I2CER_TXE instead of I2CER_BUSY)
- replace forgotten iic with i2c
- prefix debug-output on init with 0x and add frequency

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:28 +02:00
Jochen Friedrich
61045dbe9d i2c: Add support for I2C bus on Freescale CPM1/CPM2 controllers
This driver uses the port of 2.4 code from Vitaly Bordug
<vitb@kernel.crashing.org> and the actual algorithm used by the i2c
driver of the DBox code on cvs.tuxboc.org from Felix Domke
(tmbinc@gmx.net) and Gillem (htoa@gmx.net) converted to an
of_platform_driver. Tested on CPM1 (MPC823 on dbox2 hardware) and
CPM2 (MPC8272).

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:27 +02:00
Alan Cox
77e38bffe0 i2c: Push ioctl BKL down into the i2c code
This is part of the effort to get rid of the BKL.

[JD: In fact i2c-dev doesn't need more locking than is already done
for the other i2c drivers, so we can simply switch to unlocked_ioctl.]

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:27 +02:00
Alek Du
5bc1200852 i2c: Add Intel SCH SMBus support
New i2c bus driver for the Intel SCH chipsets (AF82US15W, AF82US15L,
AF82UL11L).

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:27 +02:00
Jean Delvare
f7050bd716 i2c: Simplify i2c_del_driver()
i2c_del_driver() can be simplified a bit.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:26 +02:00
Matthias Kaehlcke
6a03cd9311 i2c: Use list_for_each_entry_safe
Use list_for_each_entry_safe() in i2c_del_adapter() and i2c_del_driver().

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:26 +02:00
Wolfram Sang
7650da023e i2c-pca-platform: Fix error code
Fix errorcode to be more descriptive when ioremap fails.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:26 +02:00
Wolfram Sang
c80ebe7987 i2c-pca-algo: Fix error code
Give a more concrete error code, when the bus is not idle.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:26 +02:00
Jean Delvare
ac7fc4fb2b i2c: Consistently reject unsupported transactions
Many PC SMBus host controller drivers don't properly handle the case
where they are requested to achieve a transaction they do not support.
Update them so that the consistently print a warning message and
return a single error value in this case.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:25 +02:00
Jean Delvare
fa63cd56d2 i2c-piix4: Various cleanups and minor fixes
The i2c-piix4 driver was used recently as a model to write a new SMBus
host controller driver and this made me realize that the code of this
old driver wasn't exactly good. So, here are many cleanups and minor
fixes to this driver, so that these minor mistakes aren't duplicated
again:

* Delete unused structure.
* Delete needless forward function declaration.
* Properly announce the SMBus host controller as we find it.
* Spell it SMBus not SMB.
* Return -EBUSY instead of -ENODEV when the I/O region is already in
  use.
* Drop useless masks on the 7-bit address and the R/W bit.
* Reject block transaction requests with an invalid block length.
* Check and report block transaction replies with an invalid block
  length.
* Delete a useless comment.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:25 +02:00
David Brownell
97140342e6 i2c: Bus drivers return -Errno not -1
Tighten error paths used by various i2c adapters (mostly x86) so
they return real fault/errno codes instead of a "-1" (which is
most often interpreted as "-EPERM").  Build tested, with eyeball
review.

One minor initial goal is to have adapters consistently return
the code "-ENXIO" when addressing a device doesn't get an ACK
response, at least in the probe paths where they are already
good at stifling related logspam.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:25 +02:00
David Brownell
6ea438ec8d i2c: i2c_use_client() defends against NULL
Defend the i2c refcount calls against NULL pointers, as is important
(and conventional) for such calls.  Note that none of the current
callers of i2c_use_client() use its return value.

[JD: I hate this but apparently all the other subsystems do it so...]

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:24 +02:00
David Brownell
a1cdedac63 i2c: Kerneldoc for most I/O calls
Provide kerneldoc for most of the I2C and SMBus I/O calls.  Add a
comment summarizing some fault reporting issues which affect the
ability to provide clean fault reports through I2C master transfer
calls.  (Making it hard to precisely specify their return values...)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:24 +02:00
Jean Delvare
ae7193f7fa i2c: Update stray references to smbus_access
That function is actually named i2c_smbus_xfer.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:24 +02:00
Jean Delvare
67c2e66571 i2c: Delete unused function i2c_smbus_write_quick
Function i2c_smbus_write_quick has no users left, so we can delete it.

Also update the list of these helper functions which are gone but
could be added back if needed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:23 +02:00
Jean Delvare
f5b728a164 i2c: Group bus drivers by type
The list of I2C/SMBus bus drivers is growing and it is sometimes
difficult for the users to figure out what drivers they should enable.
By grouping the drivers by type, I hope to make the selection easier.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:23 +02:00
David Brownell
24a5bb7b18 i2c-core: Return -Errno, not -1
More updates to the I2C stack's fault reporting:  make the core stop
returning "-1" (usually "-EPERM") for all faults.  Instead, pass lower
level fault code up the stack, or return some appropriate errno.

This patch happens to touch almost exclusively SMBus calls.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:23 +02:00
Jean Delvare
75415490d6 i2c-core: Remove needless include
i2c-core doesn't use seq files, so doesn't need to include
<linux/seq_file.h>.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:22 +02:00
David Brownell
81fded1f79 i2c: Document standard fault codes
Create Documentation/i2c/fault-codes to help standardize
fault/error code usage in the I2C stack.  It turns out that
returning -1 (-EPERM) for everything was not at all helpful.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:22 +02:00
Mike Frysinger
4d2bee582b i2c-bfin-twi: Update the dependencies
Since only a few Blackfins lack TWI, just list them in a depends
statement.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:22 +02:00
Adrian Bunk
20a9b6e7c3 i2c: Remove 3 deprecated bus drivers
This patch contains the scheduled removal of i2c-i810, i2c-prosavage
and i2c-savage4.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:22 +02:00
Jean Delvare
279e902445 i2c-nforce2: Add support for multiplexing on the Tyan S4985
Just like the Tyan S4882, the S4985 uses a multiplexer to give access
to all 16 memory module SPD EEPROMs. This specific i2c-nforce2-s4985
driver adds support for this. It is heavily based on the older
i2c-amd756-s4882 driver.

As more mainboards will use multiplexer chips, we will have to find a
way to support them without having to write a new specfic driver for
each. The recent changes to the i2c subsystem should help us, and the
new gpio subsystem might help, too.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:21 +02:00
Troy Kisky
2e74378798 i2c-davinci: Initialize cmd_complete sooner
If an interrupt happens before an I2c master read/write,
complete is called on uninitialized structure.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:21 +02:00
Troy Kisky
5a0d5f5ffa i2c-davinci: Fix signal handling bug
If wait_for_completion_interruptible_timeout exits due
to a signal, the i2c bus was locking up.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:21 +02:00
Troy Kisky
0ab56e2067 i2c-davinci: Remove useless IVR read
Interrupts are enabled at the point where the DAVINCI_I2C_IVR_REG is read,
so unless an interrupt happened just at that moment, no interrupt would be
pending. Even though documentation implies you should do this, I see no
reason. If slave support is added, this read would cause a hard to
reproduce bug.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:20 +02:00
Troy Kisky
d868caa177 i2c-davinci: Move dev_dbg statement for more output
Previously the dev_dbg only printed if no error.
Printing also on an error is more useful

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:20 +02:00
Troy Kisky
cc99ff70c7 i2c-davinci: Ensure clock between 7-12 MHz
Ensure psc value gives a clock between 7-12 MHz

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:20 +02:00
Dave Young
7f101a9786 i2c: Use class_for_each_device
Use class_for_each_device for iteration.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:19 +02:00
Linus Torvalds
bce7f793da Linux 2.6.26 2008-07-13 14:51:29 -07:00
Li Zefan
ec229e8300 devcgroup: fix permission check when adding entry to child cgroup
# cat devices.list
 c 1:3 r
 # echo 'c 1:3 w' > sub/devices.allow
 # cat sub/devices.list
 c 1:3 w

As illustrated, the parent group has no write permission to /dev/null, so
it's child should not be allowed to add this write permission.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-13 12:51:18 -07:00
Li Zefan
17d213f806 devcgroup: always show positive major/minor num
# echo "b $((0x7fffffff)):$((0x80000000)) rwm" > devices.allow
 # cat devices.list
 b 214748364:-21474836 rwm

though a major/minor number of 0x800000000 is meaningless, we
should not cast it to a negative value.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-13 12:51:18 -07:00
Jiri Pirko
0302c01b4b Documentation/HOWTO: correct wrong kernel bugzilla FAQ URL
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-13 12:51:18 -07:00