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authorDavide Ciminaghi <ciminaghi@gnudd.com>2012-10-16 15:56:59 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-10-17 16:52:02 +0900
commit0d4529c534c1c664f25088eb5f5b4d7ce0ee2510 (patch)
tree5b080ef0a319b90fbcb0ab4eb768aae54851915e /include/linux/regmap.h
parentddffeb8c4d0331609ef2581d84de4d763607bd37 (diff)
regmap: make lock/unlock functions customizable
It is sometimes convenient for a regmap user to override the standard regmap lock/unlock functions with custom functions. For instance this can be useful in case an already existing spinlock or mutex has to be used for locking a set of registers instead of the internal regmap spinlock/mutex. Note that the fast_io field of struct regmap_bus is ignored in case custom locking functions are used. Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/linux/regmap.h')
-rw-r--r--include/linux/regmap.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index e3bcc3f4dcb8..5d243786f254 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -53,6 +53,9 @@ enum regmap_endian {
REGMAP_ENDIAN_NATIVE,
};
+typedef void (*regmap_lock)(void *);
+typedef void (*regmap_unlock)(void *);
+
/**
* Configuration for the register map of a device.
*
@@ -75,6 +78,12 @@ 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
@@ -116,6 +125,9 @@ 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;
@@ -181,7 +193,9 @@ 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.