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authorPeter Rosin <peda@axentia.se>2016-08-25 23:07:01 +0200
committerWolfram Sang <wsa@the-dreams.de>2016-08-30 22:56:14 +0200
commitd1ed7985b9a6b85ea38a330108c51ec83381c01b (patch)
treed97296b9891543fec4e2d1da28d154db8e8a6b04 /include/linux/i2c.h
parent718917b9875fcfa6450e7274d2727c4680c3591a (diff)
i2c: move locking operations to their own struct
This makes it trivial to constify them, so do that. Signed-off-by: Peter Rosin <peda@axentia.se> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h25
1 files changed, 18 insertions, 7 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 5b4a3cbe5d7d..4a4099d3a4b9 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -427,6 +427,20 @@ struct i2c_algorithm {
};
/**
+ * struct i2c_lock_operations - represent I2C locking operations
+ * @lock_bus: Get exclusive access to an I2C bus segment
+ * @trylock_bus: Try to get exclusive access to an I2C bus segment
+ * @unlock_bus: Release exclusive access to an I2C bus segment
+ *
+ * The main operations are wrapped by i2c_lock_bus and i2c_unlock_bus.
+ */
+struct i2c_lock_operations {
+ void (*lock_bus)(struct i2c_adapter *, unsigned int flags);
+ int (*trylock_bus)(struct i2c_adapter *, unsigned int flags);
+ void (*unlock_bus)(struct i2c_adapter *, unsigned int flags);
+};
+
+/**
* struct i2c_timings - I2C timing information
* @bus_freq_hz: the bus frequency in Hz
* @scl_rise_ns: time SCL signal takes to rise in ns; t(r) in the I2C specification
@@ -536,6 +550,7 @@ struct i2c_adapter {
void *algo_data;
/* data fields that are valid for all devices */
+ const struct i2c_lock_operations *lock_ops;
struct rt_mutex bus_lock;
struct rt_mutex mux_lock;
@@ -552,10 +567,6 @@ struct i2c_adapter {
struct i2c_bus_recovery_info *bus_recovery_info;
const struct i2c_adapter_quirks *quirks;
-
- void (*lock_bus)(struct i2c_adapter *, unsigned int flags);
- int (*trylock_bus)(struct i2c_adapter *, unsigned int flags);
- void (*unlock_bus)(struct i2c_adapter *, unsigned int flags);
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
@@ -597,7 +608,7 @@ int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
static inline void
i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
- adapter->lock_bus(adapter, flags);
+ adapter->lock_ops->lock_bus(adapter, flags);
}
/**
@@ -611,7 +622,7 @@ i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
static inline int
i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
- return adapter->trylock_bus(adapter, flags);
+ return adapter->lock_ops->trylock_bus(adapter, flags);
}
/**
@@ -623,7 +634,7 @@ i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
static inline void
i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
- adapter->unlock_bus(adapter, flags);
+ adapter->lock_ops->unlock_bus(adapter, flags);
}
static inline void