linux/drivers/base/regmap, branch v3.2.38

regmap: debugfs: Avoid overflows for very small reads

2013-01-03T03:33:32Z

commit db04328c167ff8e7c57f4a3532214aeada3a82fd upstream. If count is less than the size of a register then we may hit integer wraparound when trying to move backwards to check if we're still in the buffer. Instead move the position forwards to check if it's still in the buffer, we are unlikely to be able to allocate a buffer sufficiently big to overflow here. Signed-off-by: Mark Brown [bwh: Backported to 3.2: formatted length is tot_len] Signed-off-by: Ben Hutchings

regmap: Fix cache defaults initialization from raw cache defaults

2012-03-01T00:30:52Z

commit 61cddc57dc14a5dffa0921d9a24fd68edbb374ac upstream. Currently registers with a value of 0 are ignored when initializing the register defaults from raw defaults. This worked in the past, because registers without a explicit default were assumed to have a default value of 0. This was changed in commit b03622a8 ("regmap: Ensure rbtree syncs registers set to zero properly"). As a result registers, which have a raw default value of 0 are now assumed to have no default. This again can result in unnecessary writes when syncing the cache. It will also result in unnecessary reads for e.g. the first update operation. In the case where readback is not possible this will even let the update operation fail, if the register has not been written to before. So this patch removes the check. Instead it adds a check to ignore raw defaults for registers which are volatile, since those registers are not cached. Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman

drivers/base: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required.

2011-10-31T23:31:38Z

Most of these files were implicitly getting EXPORT_SYMBOL via device.h which was including module.h, but that path will be broken soon. [ with input from Stephen Rothwell ] Signed-off-by: Paul Gortmaker

Merge branch 'for-linus' of git://opensource.wolfsonmicro.com/regmap

2011-10-25T11:57:45Z

* 'for-linus' of git://opensource.wolfsonmicro.com/regmap: (62 commits) mfd: Enable rbtree cache for wm831x devices regmap: Support some block operations on cached devices regmap: Allow caches for devices with no defaults regmap: Ensure rbtree syncs registers set to zero properly regmap: Allow rbtree to cache zero default values regmap: Warn on raw I/O as well as bulk reads that bypass cache regmap: Return a sensible error code if we fail to read the cache regmap: Use bsearch() to search the register defaults regmap: Fix doc comment regmap: Optimize the lookup path to use binary search regmap: Ensure we scream if we enable cache bypass/only at the same time regmap: Implement regcache_cache_bypass helper function regmap: Save/restore the bypass state upon syncing regmap: Lock the sync path, ensure we use the lockless _regmap_write() regmap: Fix apostrophe usage regmap: Make _regmap_write() global regmap: Fix lock used for regcache_cache_only() regmap: Grab the lock in regcache_cache_only() regmap: Modify map->cache_bypass directly regmap: Fix regcache_sync generic implementation ...

regmap: Support some block operations on cached devices

2011-10-13T10:41:54Z

Support raw reads if all the registers being read are volatile, the cache will have no impact for tem. Support bulk reads either directly (if all the registers are volatile) or by falling back to iterating over single register reads otherwise. Signed-off-by: Mark Brown

regmap: Allow caches for devices with no defaults

2011-10-10T10:55:32Z

We only really need the defaults in order to cut down the number of registers we sync and to satisfy reads while the device is powered off but not all devices are going to need to do that (always on devices like PMICs being the prime example) so don't require those devices to supply a default. Instead only try to fall back to hardware defaults if the driver told us to. Devices using LZO won't be able to instantiate with this, that will require some updates in the LZO code to handle this case. Signed-off-by: Mark Brown Acked-by: Dimitris Papastamos

regmap: Ensure rbtree syncs registers set to zero properly

2011-10-10T09:26:48Z

Simplify the check for registers set at their default value by avoiding picking a default value in the case where we don't have one. Instead we only compare the current value to the current value when we looked one up. This fixes the case where we don't have a default stored but the value was set to zero when that isn't the chip default. Signed-off-by: Mark Brown Acked-by: Dimitris Papastamos

regmap: Allow rbtree to cache zero default values

2011-10-10T09:25:00Z

Ensure that when we start up in cache only mode we can store defaults of zero, otherwise if the hardware is unavailable we won't be able to read. Signed-off-by: Mark Brown Acked-by: Dimitris Papastamos

regmap: Warn on raw I/O as well as bulk reads that bypass cache

2011-10-10T09:24:33Z

As with the bulk reads we really should be able to make these play nicely with the cache but warn for now. Signed-off-by: Mark Brown Acked-by: Dimitris Papastamos

regmap: Return a sensible error code if we fail to read the cache

2011-10-10T09:24:03Z

If a register isn't cached then let callers know that so they can fall back or error handle appropriately. Signed-off-by: Mark Brown Acked-by: Dimitris Papastamos