linux/drivers/i2c/algos
Wolfram Sang c01b083105 i2c-algo-pca: Extend for future drivers
The separation between algorithm and adapter was unsharp at places. This was
partly hidden by the fact, that the ISA-driver allowed just one instance and
had all private data in static variables. This patch makes neccessary
preparations to add a platform driver on top of the algorithm, while still
supporting ISA. Note: Due to lack of hardware, the ISA-driver could not be
tested except that it builds.

Concerning the core struct i2c_algo_pca_data:

- A private data field was added, all hardware dependant data may go here.
  Similar to other algorithms, now a pointer to this data is passed to the
  adapter's functions. In order to make as less changes as possible to the
  ISA-driver, it leaves the private data empty and still only uses its static
  variables.

- A "reset_chip" function pointer was added; such a functionality must come
  from the adapter, not the algorithm.

- use a variable "i2c_clock" instead of a function pointer "get_clock",
  allowing for write access to a default in case a wrong value was supplied.

In the algorithm-file:

- move "i2c-pca-algo.h" into "linux/i2c-algo-pca.h"
- now using per_instance timeout values (i2c_adap->timeout)
- error messages specify the device, not only the driver name
- restructure initialization to easily support "i2c_add_numbered_adapter"
- drop "retries" and "own" (i2c address) as they were unused

(The state-machine for I2C-communication was not touched.)

In the ISA-driver:

- adapt to new algorithm

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-04-22 22:16:46 +02:00
..
Kconfig i2c: Remove the algorithm drivers from the config menu 2008-04-22 22:16:46 +02:00
Makefile i2c: Delete the broken i2c-ite bus driver 2006-12-10 21:21:29 +01:00
i2c-algo-bit.c i2c-algo-bit: Fix NAK/ARB comments 2008-01-27 18:14:46 +01:00
i2c-algo-pca.c i2c-algo-pca: Extend for future drivers 2008-04-22 22:16:46 +02:00
i2c-algo-pcf.c i2c-algo-pcf: Delete broken 10-bit address support 2008-01-27 18:14:46 +01:00
i2c-algo-pcf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
i2c-algo-sgi.c i2c-algo-sgi: Comment and whitespace cleanups 2007-05-01 23:26:32 +02:00