I would like to implement bus recovery support for the at91 driver, but
there it is not clear how the core support is supposed to be used, and I
could not find an existing adapter implementation using it.
First off, reading the old mailing list discussion here:
http://thread.gmane.org/gmane.linux.drivers.i2c/10225
It seems a pinctrl state should be used to switch the pins over to gpio
mode. Now, I need a place to put this state switching. The
i2c_bus_recovery_info struct looks like this:
struct i2c_bus_recovery_info {
int (*recover_bus)(struct i2c_adapter *);
int (*get_scl)(struct i2c_adapter *);
void (*set_scl)(struct i2c_adapter *, int val);
int (*get_sda)(struct i2c_adapter *);
void (*prepare_recovery)(struct i2c_bus_recovery_info *bri);
void (*unprepare_recovery)(struct i2c_bus_recovery_info *bri);
/* gpio recovery */
int scl_gpio;
int sda_gpio;
};
There is no usable callback to do this, because {un,}prepare_recovery is
only passed the bus recovery info and no driver data is reachable from that.
So next up, I thought I'd wrap i2c_generic_gpio_recovery and do the
state switching there. But then I have to fill in the entire info struct
by hand which definitely does not seem to be the intention given the
special case in i2c_register_adapter. What am I missing?
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