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regmap: Customisable lock functions

Browse source 
Allow maps to replace the lock function for integration with dynamic
 register accessability states.
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Merge tag 'lock' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into for-next

regmap: Customisable lock functions

Allow maps to replace the lock function for integration with dynamic
register accessability states.
This commit is contained in:
Samuel Ortiz 2012-11-20 12:20:58 +01:00
commit 7aae79fd88
3 changed files with 54 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

16
include/linux/regmap.h
View file

@ -54,6 +54,9 @@ enum regmap_endian {
REGMAP_ENDIAN_NATIVE,
};
typedef void (*regmap_lock)(void *);
typedef void (*regmap_unlock)(void *);
/**
* Configuration for the register map of a device.
*
@ -76,6 +79,12 @@ enum regmap_endian {
* @precious_reg: Optional callback returning true if the rgister
* should not be read outside of a call from the driver
* (eg, a clear on read interrupt status register).
* @lock: Optional lock callback (overrides regmap's default lock
* function, based on spinlock or mutex).
* @unlock: As above for unlocking.
* @lock_arg: this field is passed as the only argument of lock/unlock
* functions (ignored in case regular lock/unlock functions
* are not overridden).
*
* @max_register: Optional, specifies the maximum valid register index.
* @reg_defaults: Power on reset values for registers (for use with
@ -117,6 +126,9 @@ struct regmap_config {
bool (*readable_reg)(struct device *dev, unsigned int reg);
bool (*volatile_reg)(struct device *dev, unsigned int reg);
bool (*precious_reg)(struct device *dev, unsigned int reg);
regmap_lock lock;
regmap_unlock unlock;
void *lock_arg;
unsigned int max_register;
const struct reg_default *reg_defaults;
@ -182,7 +194,9 @@ typedef void (*regmap_hw_free_context)(void *context);
* Description of a hardware bus for the register map infrastructure.
*
* @fast_io: Register IO is fast. Use a spinlock instead of a mutex
* to perform locking.
* to perform locking. This field is ignored if custom lock/unlock
* functions are used (see fields lock/unlock of
* struct regmap_config).
* @write: Write operation.
* @gather_write: Write operation with split register/value, return -ENOTSUPP
* if not implemented on a given device.