Currently, if an i2c bus driver supports both static and dynamic bus
ids, it needs to choose between calling i2c_add_numbered_adapter() and
i2c_add_adapter().  This patch makes i2c_add_numbered_adapter()
redirect to i2c_add_adapter() if the requested bus id is -1.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Final step to eliminate of_platform_bus_type.  They're all just
platform drivers now.

v2: fix type in pasemi_nand.c (thanks to Stephen Rothwell)
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

Commit 959e85f7, "i2c: add OF-style registration and binding" caused a
module dependency loop where of_i2c.c calls functions in i2c-core, and
i2c-core calls of_i2c_register_devices() in of_i2c.  This means that
when i2c support is built as a module when CONFIG_OF is set, then
neither i2c_core nor of_i2c are able to be loaded.

This patch fixes the problem by moving the of_i2c_register_devices()
calls back into the device drivers.  Device drivers already
specifically request the core code to parse the device tree for
devices anyway by setting the of_node pointer, so it isn't a big
deal to also call the registration function.  The drivers just become
slightly more verbose.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

of_device is just an alias for platform_device, so remove it entirely.  Also
replace to_of_device() with to_platform_device() and update comment blocks.

This patch was initially generated from the following semantic patch, and then
edited by hand to pick up the bits that coccinelle didn't catch.

@@
@@
-struct of_device
+struct platform_device
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: NDavid S. Miller <davem@davemloft.net>

This patch adds OF hooks to the i2c core so that devices can automatically
be registered based on device tree data.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

This patch cleans up the i2c OF support code to make it selectable by
all architectures and allow for automatic registration of i2c devices.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

.name, .match_table and .owner are duplicated in both of_platform_driver
and device_driver.  This patch is a removes the extra copies from struct
of_platform_driver and converts all users to the device_driver members.

This patch is a pretty mechanical change.  The usage model doesn't change
and if any drivers have been missed, or if anything has been fixed up
incorrectly, then it will fail with a compile time error, and the fixup
will be trivial.  This patch looks big and scary because it touches so
many files, but it should be pretty safe.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NSean MacLennan <smaclennan@pikatech.com>

Drop NO_IRQ as 0 is the preferred way to describe 'no irq'
(http://lkml.org/lkml/2005/11/21/221). This change is safe, as the driver is
only used on powerpc, where NO_IRQ is 0 anyhow.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NJochen Friedrich <jochen@scram.de>
Cc: Ben Dooks <ben-linux@fluff.org>

The following structure elements duplicate the information in
'struct device.of_node' and so are being eliminated.  This patch
makes all readers of these elements use device.of_node instead.

(struct of_device *)->node
(struct dev_archdata *)->prom_node (sparc)
(struct dev_archdata *)->of_node (powerpc & microblaze)
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

Drop NO_IRQ as 0 is the preferred way to describe 'no irq'
(http://lkml.org/lkml/2005/11/21/221). This change is safe, as the driver is
only used on powerpc, where NO_IRQ is 0 anyhow.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Cc: Jochen Friedrich <jochen@scram.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: NJochen Friedrich <jochen@scram.de>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

When a process tries to read/write a disconnected i2c device, it receives a signal (e.g. ctrl-c) and the kernel gets stuck.

BUG: soft lockup - CPU#0 stuck for 61s! [I2CEEpromTest:392]
NIP: c01628f8 LR: c01628f0 CTR: c00177cc
REGS: c39abd70 TRAP: 0901   Not tainted  (2.6.25.7-alcore)
MSR: 00009032 <EE,ME,IR,DR>  CR: 42042048  XER: 20000000
TASK = c3889bd0[392] 'I2CEEpromTest' THREAD: c39aa000
GPR00: 00009000 c39abe20 c3889bd0 c39075c8 c39abe28 00000001 00000000 00000001
GPR08: c3889bd0 c39075c8 00009032 c39abe34 00002437
NIP [c01628f8] cpm_i2c_xfer+0x5fc/0x6d0
LR [c01628f0] cpm_i2c_xfer+0x5f4/0x6d0
Call Trace:
[c39abe20] [c0162924] cpm_i2c_xfer+0x628/0x6d0 (unreliable)
[c39abe90] [c015f6a0] i2c_transfer+0x88/0xb4
[c39abeb0] [c0160164] i2c_master_recv+0x48/0x6c
[c39abed0] [c01618dc] i2cdev_read+0x50/0xe4
[c39abef0] [c0068b24] vfs_read+0xc4/0x108
[c39abf10] [c0068f4c] sys_read+0x4c/0x90
[c39abf40] [c000d348] ret_from_syscall+0x0/0x38
Instruction dump:
3bc00064 92610010 3bf201c8 92810014 3b61

This happen because though the wait_event_interruptible_timeout takes the
signals into account, the driver does not handle them.
We propose to change the wait_event_interruptible_timeout with
wait_event_timeout, leaving the signals to be handled in other points
on the upper layers.
Signed-off-by: NBruno Morelli <bruno@evidence.eu.com>
Signed-off-by: NMichael Trimarchi <michael@evidence.eu.com>
Acked-by: NJochen Friedrich <jochen@scram.de>
[ben-linux@fluff.org: fix title for patch]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Recent DMA changes result in a BUG() when NULL is passed to
dma_alloc_coherent in place of a device.
Signed-off-by: NMark Ware <mware@elphinstone.net>
[ben-linux@fluff.org: fix patch moves]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Make the driver report an ENXIO error immediately upon NAK instead of
waiting for another interrupt and getting a timeout.

When reading from a device that is not present or declines to respond
to, e.g., a non-existent register address, CPM immediately reports a
NAK condition in the TxBD, but the driver kept waiting until a timeout,
which takes 1 second and causes an ugly console error message.
Signed-off-by: NMike Ditto <mditto@consentry.com>
Acked-by: NJochen Friedrich <jochen@scram.de>
[ben-linux@fluff.org: reordered description text]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Similar to commit 618b26d5, also remove
automatic probing for this i2c controller. Might need updates to dts files
using it.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NJochen Friedrich <jochen@scram.de>
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

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: NJean Delvare <khali@linux-fr.org>

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: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NJochen Friedrich <jochen@scram.de>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

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: NJochen Friedrich <jochen@scram.de>
Tested-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NJean Delvare <khali@linux-fr.org>