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i2c: Add i2c_new_probed_device()

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Add a new helper function to instantiate an i2c device. It is meant as a
replacement for i2c_new_device() when you don't know for sure at which
address your I2C/SMBus device lives. This happens frequently on TV
adapters for example, you know there is a tuner chip on the bus, but
depending on the exact board model and revision, it can live at different
addresses. So, the new i2c_new_probed_device() function will probe the bus
according to a list of addresses, and as soon as one of these addresses
responds, it will call i2c_new_device() on that one address.

This function will make it possible to port the old i2c drivers to the
new model quickly.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare
2007-05-01 23:26:31 +02:00
committed by Jean Delvare
parent 0f3b483852
commit 12b5053ac5
2 changed files with 72 additions and 0 deletions
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9
include/linux/i2c.h
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@ -245,6 +245,15 @@ struct i2c_board_info {
extern struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
/* If you don't know the exact address of an I2C device, use this variant
* instead, which can probe for device presence in a list of possible
* addresses.
*/
extern struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
struct i2c_board_info *info,
unsigned short const *addr_list);
extern void i2c_unregister_device(struct i2c_client *);
/* Mainboard arch_initcall() code should register all its I2C devices.