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| author | David Brownell <david-b@pacbell.net> | 2007-05-01 23:26:31 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@hyperion.delvare> | 2007-05-01 23:26:31 +0200 |
| commit | 9c1600eda42e52796f49b36cf15b9debcfd09bea (patch) | |
| tree | fe93f5924c7777cd5c3cc1ef6033dd2dfae542b5 /drivers/i2c/Makefile | |
| parent | i2c: i2c probe() and remove() documented (diff) | |
| download | linux-9c1600eda42e52796f49b36cf15b9debcfd09bea.tar.xz linux-9c1600eda42e52796f49b36cf15b9debcfd09bea.zip | |
i2c: Add i2c_board_info and i2c_new_device()
This provides partial support for new-style I2C driver binding. It builds
on "struct i2c_board_info" declarations that identify I2C devices on a given
board. This is needed on systems with I2C devices that can't be fully probed
and/or autoconfigured, such as many embedded Linux configurations where the
way a given I2C device is wired may affect how it must be used.
There are two models for declaring such devices:
* LATE -- using a public function i2c_new_device(). This lets modules
declare I2C devices found *AFTER* a given I2C adapter becomes available.
For example, a PCI card could create adapters giving access to utility
chips on that card, and this would be used to associate those chips with
those adapters.
* EARLY -- from arch_initcall() level code, using a non-exported function
i2c_register_board_info(). This copies the declarations *BEFORE* such
an i2c_adapter becomes available, arranging that i2c_new_device() will
be called later when i2c-core registers the relevant i2c_adapter.
For example, arch/.../.../board-*.c files would declare the I2C devices
along with their platform data, and I2C devices would behave much like
PNPACPI devices. (That is, both enumerate from board-specific tables.)
To match the exported i2c_new_device(), the previously-private function
i2c_unregister_device() is now exported.
Pending later patches using these new APIs, this is effectively a NOP.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/Makefile')
| -rw-r--r-- | drivers/i2c/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 71c5a854ac5d..ba26e6cbe74e 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -2,6 +2,7 @@ # Makefile for the i2c core. # +obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o obj-$(CONFIG_I2C) += i2c-core.o obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o obj-y += busses/ chips/ algos/ |