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While the JC42-compatible chips are temperature sensors, I2C_CLASS_SPD
makes more sense because these chips always live on memory modules.
Signed-off-by: Jean Delvare <[email protected]>
Cc: Guenter Roeck <[email protected]>
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There is no user left of i2c_adapter.id, so we can get rid of it.
Finally! :)
Signed-off-by: Jean Delvare <[email protected]>
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The last legitimate user of i2c_driver.attach_adapter and
.detach_adapter is gone, so we can finally deprecate these callbacks.
The last few drivers which still use these will have to be updated to
make use of standard I2C device instantiation ways instead.
Signed-off-by: Jean Delvare <[email protected]>
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Introduce i2c_for_each_dev(), an i2c device iterator with proper
locking for use by i2c-dev. This is needed so that we can get rid of
the attach_adapter and detach_adapter legacy callback functions.
Signed-off-by: Jean Delvare <[email protected]>
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The last remaining ID in <linux/i2c-id.h> is no longer used anywhere,
so we can finally get rid of it.
Signed-off-by: Jean Delvare <[email protected]>
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Rename the parameter of i2c_get_adapter() to "nr", to make it clear we
are passing an adapter number and not an adapter ID (which have gone
away by now.)
Signed-off-by: Jean Delvare <[email protected]>
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Having conditional around the of_match_table and the of_node pointers
turns out to make driver code use ugly #ifdef blocks. Drop the
conditionals and remove the #ifdef blocks from the affected drivers.
Also tidy up minor whitespace issues within the same hunks.
Signed-off-by: Grant Likely <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
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Helper functions for I2C and SMBus transactions don't modify the
i2c_client that is passed to them, so it can be marked const.
Signed-off-by: Jean Delvare <[email protected]>
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It's about time to make it clear that i2c_adapter.id is deprecated.
Hopefully this will remind the last user to move over to a different
strategy.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Jarod Wilson <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Hans Verkuil <[email protected]>
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There are no users left for I2C_CLASS_TV_ANALOG and
I2C_CLASS_TV_DIGITAL, so we can get rid of them.
Signed-off-by: Jean Delvare <[email protected]>
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This makes the calling site's code clearer IMHO.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Michael Lawnick <[email protected]>
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Only i2c devices can have their type set to i2c_adapter_type, so
testing the bus type is redundant.
Signed-off-by: Jean Delvare <[email protected]>
Cc: Michael Lawnick <[email protected]>
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Add multiplexed bus core support. I2C multiplexer and switches
like pca954x get instantiated as new adapters per port.
Signed-off-by: Michael Lawnick <[email protected]>
Acked-by: Rodolfo Giometti <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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Moving userspace-instantiated clients to separate lists wasn't nearly
enough to avoid deadlocks in multiplexed bus cases. We also want to
have a dedicated mutex to protect each list.
Signed-off-by: Jean Delvare <[email protected]>
Cc: Michael Lawnick <[email protected]>
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Uninline i2c adapter locking helper functions, move them to i2c-core,
and use them in i2c-core itself. The functions are still exported for
external users. This makes future updates to the locking model (which
will be needed for multiplexing support) possible and transparent.
Signed-off-by: Jean Delvare <[email protected]>
Cc: Michael Lawnick <[email protected]>
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Now that i2c-core offers the possibility to provide custom probing
function for I2C devices, let's make use of it.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
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The probe method used by i2c_new_probed_device() may not be suitable
for all cases. Let the caller provide its own, optional probe
function.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
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Fix kernel-doc warnings in linux/i2c.h:
Warning(include/linux/i2c.h:176): No description found for parameter 'alert'
Warning(include/linux/i2c.h:259): No description found for parameter 'of_node'
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Merging in current state of Linus' tree to deal with merge conflicts and
build failures in vio.c after merge.
Conflicts:
drivers/i2c/busses/i2c-cpm.c
drivers/i2c/busses/i2c-mpc.c
drivers/net/gianfar.c
Also fixed up one line in arch/powerpc/kernel/vio.c to use the
correct node pointer.
Signed-off-by: Grant Likely <[email protected]>
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Using a single list for all userspace devices leads to a dead lock
on multiplexed buses in some circumstances (mux chip instantiated
from userspace). This is solved by using a separate list for each
bus segment.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Michael Lawnick <[email protected]>
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The struct device_node *of_node pointer is moving out of dev->archdata
and into the struct device proper. of_i2c.c needs to set the of_node
pointer before the device is registered. Since the i2c subsystem
doesn't allow 2 stage allocation and registration of i2c devices, the
of_node pointer needs to be passed via the i2c_board_info structure
so that it is set prior to registration.
This patch adds of_node to struct i2c_board_info (conditional on
CONFIG_OF), sets of_node in i2c_new_device(), and modifies of_i2c.c
to use the new parameter. The calling of dev_archdata_set_node()
from of_i2c will be removed in a subsequent patch when of_node is
removed from archdata and all users are converted over.
Signed-off-by: Grant Likely <[email protected]>
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i2c_master_send & i2c_master_recv do not support more than 64 kb
transfer, since msg.len is u16.
Signed-off-by: Zhangfei Gao <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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SMBus alert support. The SMBus alert protocol allows several SMBus
slave devices to share a single interrupt pin on the SMBus master,
while still allowing the master to know which slave triggered the
interrupt.
This is based on preliminary work by David Brownell. The key
difference between David's implementation and mine is that his was
part of i2c-core, while mine is split into a separate, standalone
module named i2c-smbus. The i2c-smbus module is meant to include
support for all SMBus extensions to the I2C protocol in the future.
The benefit of this approach is a zero cost for I2C bus segments which
do not need SMBus alert support. Where David's implementation
increased the size of struct i2c_adapter by 7% (40 bytes on i386),
mine doesn't touch it. Where David's implementation added over 150
lines of code to i2c-core (+10%), mine doesn't touch it. The only
change that touches all the users of the i2c subsystem is a new
callback in struct i2c_driver (common to both implementations.) I seem
to remember Trent was worried about the footprint of David'd
implementation, hopefully mine addresses the issue.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Cc: David Brownell <[email protected]>
Cc: Trent Piepho <[email protected]>
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There is no user left of I2C_CLIENT_MODULE_PARM, so we can finally
get rid of this ugly macro.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
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These macros simply declare an enum, so drivers might as well declare
it themselves. This puts an end to the arbitrary limit of 8 chip types
per i2c driver.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
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This macro simply declares an enum, so drivers might as well declare
it themselves.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
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Struct i2c_client_address_data only contains one field at this point,
which makes its usefulness questionable. Get rid of it and pass simple
address lists around instead.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
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The "kind" parameter always has value -1, and nobody is using it any
longer, so we can remove it.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
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The legacy probe and force module parameters are obsolete now, the
same can be achieved using the new_device sysfs interface, which is
both more flexible and cheaper (it is implemented by i2c-core rather
than replicated in every driver module.)
The legacy ignore module parameters can be dropped as well. Ignoring
can be done by instantiating a "dummy" device at the problematic
address.
This is the first step of a huge cleanup to i2c-core's i2c_detect
function, i2c.h's I2C_CLIENT_INSMOD* macros, and all drivers that made
use of them.
Signed-off-by: Jean Delvare <[email protected]>
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Low priority thread holding the i2c bus mutex could block higher
priority threads to access the bus resulting in unacceptable
latencies. Change the mutex type to rt_mutex preventing priority
inversion.
Tested-by: Peter Ujfalusi <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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Some drivers need to be able to prevent access to an I2C bus segment
for a specific period of time. Add an interface for them to do so
without twiddling with i2c-core internals.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Ben Hutchings <[email protected]>
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Nobody is using i2c_driver.id any longer, so we can drop that field.
Signed-off-by: Jean Delvare <[email protected]>
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For video4linux we sometimes need to probe for a single i2c address.
Normally you would do it like this:
static const unsigned short addrs[] = {
addr, I2C_CLIENT_END
};
client = i2c_new_probed_device(adapter, &info, addrs);
This is a bit awkward and I came up with this macro:
#define V4L2_I2C_ADDRS(addr, addrs...) \
((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
This can construct a list of one or more i2c addresses on the fly. But
this is something that really belongs in i2c.h, renamed to I2C_ADDRS.
With this macro we can just do:
client = i2c_new_probed_device(adapter, &info, I2C_ADDRS(addr));
Note that this can also be used to initialize an array:
static const unsigned short addrs[] = I2C_ADDRS(0x2a, 0x2c);
Whether you want to is another matter, but it works. This functionality is
also available in the oldest supported gcc (3.2).
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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Surround i2c function declarations with ifdefs, so that they aren't
advertised when i2c-core isn't actually built. That way, drivers using
these functions unconditionally will result in an immediate build
failure, rather than a late linking failure which is harder to figure
out.
Signed-off-by: Jean Delvare <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Paul Mundt <[email protected]>
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Add a sysfs interface to instantiate and delete I2C devices. This is
primarily a replacement of the force_* module parameters implemented
by some i2c drivers. These module parameters were implemented
internally by the I2C_CLIENT_INSMOD* macros, which don't scale well.
This can also be used when developing a driver on a self-soldered
board which doesn't yet have proper I2C device declaration at the
platform level, and presumably for various debugging situations.
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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We used to maintain our own per-adapter list of i2c clients, but this
is redundant with what the driver core does, and no longer needed.
Just drop the redundant list.
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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Legacy i2c drivers are gone, all drivers are new-style now, so there
is no point to check.
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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The legacy i2c_probe() function has no users left, get rid of it.
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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We converted all the legacy i2c drivers so we can finally get rid of
the legacy binding model. Hooray!
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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These methods were useful in the legacy binding model but no longer in
the new (standard) binding model. There are no users left so we can
drop them.
Signed-off-by: Jean Delvare <[email protected]>
Cc: David Brownell <[email protected]>
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Since the first argument to I2C_BOARD_INFO() must be a string constant,
there is no need to parenthesise it, and adding parentheses results in
an invalid initialiser for char[]. gcc obviously accepts this syntax as
an extension, but sparse complains, e.g.:
drivers/net/sfc/boards.c:173:2: warning: array initialized from parenthesized string constant
Therefore, remove the parentheses.
Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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The new i2c binding model makes the client_register and
client_unregister methods of struct i2c_adapter useless, so we can
remove them with the rest of the legacy model.
Signed-off-by: Jean Delvare <[email protected]>
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The unit in which user-space can set the bus timeout value is jiffies
for historical reasons (back when HZ was always 100.) This is however
not good because user-space doesn't know how long a jiffy lasts. The
timeout value should instead be set in a fixed time unit. Given the
original value of HZ, this unit should be 10 ms, for compatibility.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
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Let the kernel developers know that i2c_attach_client() and
i2c_detach_client() are deprecated and should no longer be used.
Drivers using these should be converted to the standard device
driver binding model (probe and remove methods.)
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Ben Dooks <[email protected]>
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There are a number of drivers which set their i2c bus class to
I2C_CLASS_CAM_DIGITAL, however no chip driver actually checks for this
flag, so we might as well drop it now.
Signed-off-by: Jean Delvare <[email protected]>
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There are no users left of these two i2c probe class flags so we can
drop the now.
Signed-off-by: Jean Delvare <[email protected]>
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I2C_CLASS_ALL is almost never what bus driver authors really want.
These i2c classes are really only about which devices must be probed,
not what devices can be present. As device drivers get converted to the
new i2c device driver model, only a few device types will keep relying
on probing.
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Sonic Zhang <[email protected]>
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If present the info->archdata is copied into the dev->archdata.
Some (OpenFirmware) platforms need it.
Signed-off-by: Anton Vorontsov <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
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Fix most checkpatch.pl errors and warnings. This includes replacing
spaces with tabs in many places, adding and removing spaces, and
folding long lines.
Also complete a couple prototypes to make it clearer what the
parameters represent.
Signed-off-by: Jean Delvare <[email protected]>
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We have no users and no implementers for these transfer types so it
makes little sense to define functionality bits for them.
Signed-off-by: Jean Delvare <[email protected]>
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