diff options
| author | Peter Rosin <peda@axentia.se> | 2016-08-25 23:07:01 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-08-30 22:56:14 +0200 |
| commit | d1ed7985b9a6b85ea38a330108c51ec83381c01b (patch) | |
| tree | d97296b9891543fec4e2d1da28d154db8e8a6b04 /include/linux/i2c.h | |
| parent | 718917b9875fcfa6450e7274d2727c4680c3591a (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.h | 25 |
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 |