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Subject[PATCH 2/2] i2c: move locking operations to their own struct
Date
This makes it trivial to constify them, so do that.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/i2c-core.c | 13 ++++++++-----
drivers/i2c/i2c-mux.c | 25 ++++++++++++++++---------
include/linux/i2c.h | 25 ++++++++++++++++++-------
3 files changed, 42 insertions(+), 21 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 2c9135ffdf10..ce252ba13247 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1511,6 +1511,12 @@ 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 = 0;
@@ -1533,11 +1539,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
return -EINVAL;
}

- 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);
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 764f195795e4..14741ff31041 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -263,6 +263,18 @@ 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)
@@ -312,15 +324,10 @@ 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)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index e1a8d72ebccb..765bea57eeb3 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -414,6 +414,20 @@ 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
@@ -523,6 +537,7 @@ 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;

@@ -539,10 +554,6 @@ 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)

@@ -584,7 +595,7 @@ 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);
}

/**
@@ -598,7 +609,7 @@ 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);
}

/**
@@ -610,7 +621,7 @@ 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
--
2.1.4
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