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Platform: x86: chromeos_laptop - Add support for probing devices

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This will allow support for devices that may appear at more than
one i2c address at boot time. The specific example is the atmel_mxt touch
devices, which may appear at a different address if it comes up
in bootloader mode.

Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Benson Leung 2013-02-21 12:14:58 -08:00 committed by Matthew Garrett
parent 8e1ad4c4bf
commit bcaf089c51
1 changed files with 20 additions and 0 deletions
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20
drivers/platform/x86/chromeos_laptop.c
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@ -147,6 +147,26 @@ static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
return adapter->nr;
}
/*
* Takes a list of addresses in addrs as such :
* { addr1, ... , addrn, I2C_CLIENT_END };
* add_probed_i2c_device will use i2c_new_probed_device
* and probe for devices at all of the addresses listed.
* Returns NULL if no devices found.
* See Documentation/i2c/instantiating-devices for more information.
*/
static __init struct i2c_client *add_probed_i2c_device(
const char *name,
enum i2c_adapter_type type,
struct i2c_board_info *info,
const unsigned short *addrs)
{
return __add_probed_i2c_device(name,
find_i2c_adapter_num(type),
info,
addrs);
}
/*
* Probes for a device at a single address, the one provided by
* info->addr.