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i2c: move locking operations to their own struct

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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>
This commit is contained in:
Peter Rosin 2016-08-25 23:07:01 +02:00 committed by Wolfram Sang
parent 718917b987
commit d1ed7985b9
4 changed files with 49 additions and 24 deletions
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10
drivers/gpu/drm/drm_dp_helper.c
View File

@ -790,6 +790,12 @@ static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags)
mutex_unlock(&i2c_to_aux(i2c)->hw_mutex);
}
static const struct i2c_lock_operations drm_dp_i2c_lock_ops = {
.lock_bus = lock_bus,
.trylock_bus = trylock_bus,
.unlock_bus = unlock_bus,
};
/**
* drm_dp_aux_init() - minimally initialise an aux channel
* @aux: DisplayPort AUX channel
@ -807,9 +813,7 @@ void drm_dp_aux_init(struct drm_dp_aux *aux)
aux->ddc.algo_data = aux;
aux->ddc.retries = 3;
aux->ddc.lock_bus = lock_bus;
aux->ddc.trylock_bus = trylock_bus;
aux->ddc.unlock_bus = unlock_bus;
aux->ddc.lock_ops = &drm_dp_i2c_lock_ops;
}
EXPORT_SYMBOL(drm_dp_aux_init);

13
drivers/i2c/i2c-core.c
View File

@ -1768,6 +1768,12 @@ static int __process_new_adapter(struct device_driver *d, void *data)
return i2c_do_add_adapter(to_i2c_driver(d), data);
}
static const struct i2c_lock_operations i2c_adapter_lock_ops = {
.lock_bus = i2c_adapter_lock_bus,
.trylock_bus = i2c_adapter_trylock_bus,
.unlock_bus = i2c_adapter_unlock_bus,
};
static int i2c_register_adapter(struct i2c_adapter *adap)
{
int res = -EINVAL;
@ -1787,11 +1793,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
goto out_list;
}
if (!adap->lock_bus) {
adap->lock_bus = i2c_adapter_lock_bus;
adap->trylock_bus = i2c_adapter_trylock_bus;
adap->unlock_bus = i2c_adapter_unlock_bus;
}
if (!adap->lock_ops)
adap->lock_ops = &i2c_adapter_lock_ops;
rt_mutex_init(&adap->bus_lock);
rt_mutex_init(&adap->mux_lock);

25
drivers/i2c/i2c-mux.c
View File

@ -267,6 +267,18 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
}
EXPORT_SYMBOL_GPL(i2c_mux_alloc);
static const struct i2c_lock_operations i2c_mux_lock_ops = {
.lock_bus = i2c_mux_lock_bus,
.trylock_bus = i2c_mux_trylock_bus,
.unlock_bus = i2c_mux_unlock_bus,
};
static const struct i2c_lock_operations i2c_parent_lock_ops = {
.lock_bus = i2c_parent_lock_bus,
.trylock_bus = i2c_parent_trylock_bus,
.unlock_bus = i2c_parent_unlock_bus,
};
int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
u32 force_nr, u32 chan_id,
unsigned int class)
@ -316,15 +328,10 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
priv->adap.retries = parent->retries;
priv->adap.timeout = parent->timeout;
priv->adap.quirks = parent->quirks;
if (muxc->mux_locked) {
priv->adap.lock_bus = i2c_mux_lock_bus;
priv->adap.trylock_bus = i2c_mux_trylock_bus;
priv->adap.unlock_bus = i2c_mux_unlock_bus;
} else {
priv->adap.lock_bus = i2c_parent_lock_bus;
priv->adap.trylock_bus = i2c_parent_trylock_bus;
priv->adap.unlock_bus = i2c_parent_unlock_bus;
}
if (muxc->mux_locked)
priv->adap.lock_ops = &i2c_mux_lock_ops;
else
priv->adap.lock_ops = &i2c_parent_lock_ops;
/* Sanity check on class */
if (i2c_mux_parent_classes(parent) & class)

25
include/linux/i2c.h
View File

@ -426,6 +426,20 @@ struct i2c_algorithm {
#endif
};
/**
* 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
@ -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