On Tue, 16 Dec 2008, Scott Wood wrote:
On Mon, Dec 15, 2008 at 04:24:26PM -0800, ksi@koi8.net wrote:
Then, we could use some kind of array of I2C structures each
containing
pointers to appropriate i2c-{read,write,probe,init}() functions with
generic
i2c functions just calling those pointers using bus number as index
into
that array.
Why not just pass a pointer to the i2c device, rather than an index?
Because it is easier to change bus with i2c_set_bus() function and then use regular i2c_{read,write,probe}() functions. We are NOT passing anything. One global variable, bus_num or so, that is changed with i2c_set_bus() is used as an index for any i2c_{read,write,probe}() function. Those functions are just one line inlines calling appropriate pointers in i2c_func[bus_num] area. This way one can still use regular e.g. i2c_write() that translates to i2c_func[bus_num].i2c_write.
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