Commit b0209b39 authored by Daniel Vetter's avatar Daniel Vetter

i2c: export bit-banging algo functions

i915 has a hw i2c controller (gmbus) but for a bunch of stupid reasons
we need to be able to fall back to the bit-banging algo on gpio pins.

The current code sets up a 2nd i2c controller for the same i2c bus using
the bit-banging algo. This has a bunch of issues, the major one being
that userspace can directly access this fallback i2c adaptor behind
the drivers back.

But we need to frob a few registers before and after using fallback
gpio bit-banging, so this horribly fails.

The new plan is to only set up one i2c adaptor and transparently fall
back to bit-banging by directly calling the xfer function of the bit-
banging algo in the i2c core.

To make that possible, export the 2 i2c algo functions.

v2: As suggested by Jean Delvare, simply export the i2c_bit_algo
vtable instead of the individual functions.
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 1298330b
...@@ -610,10 +610,11 @@ static u32 bit_func(struct i2c_adapter *adap) ...@@ -610,10 +610,11 @@ static u32 bit_func(struct i2c_adapter *adap)
/* -----exported algorithm data: ------------------------------------- */ /* -----exported algorithm data: ------------------------------------- */
static const struct i2c_algorithm i2c_bit_algo = { const struct i2c_algorithm i2c_bit_algo = {
.master_xfer = bit_xfer, .master_xfer = bit_xfer,
.functionality = bit_func, .functionality = bit_func,
}; };
EXPORT_SYMBOL(i2c_bit_algo);
/* /*
* registering functions to load algorithms at runtime * registering functions to load algorithms at runtime
......
...@@ -49,5 +49,6 @@ struct i2c_algo_bit_data { ...@@ -49,5 +49,6 @@ struct i2c_algo_bit_data {
int i2c_bit_add_bus(struct i2c_adapter *); int i2c_bit_add_bus(struct i2c_adapter *);
int i2c_bit_add_numbered_bus(struct i2c_adapter *); int i2c_bit_add_numbered_bus(struct i2c_adapter *);
extern const struct i2c_algorithm i2c_bit_algo;
#endif /* _LINUX_I2C_ALGO_BIT_H */ #endif /* _LINUX_I2C_ALGO_BIT_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment