2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-04-25 14:14:52 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2006-04-25 14:14:52 +01:00
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2005-04-16 15:20:36 -07:00
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2005-10-22 00:23:27 +02:00
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2005-04-16 15:20:36 -07:00
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2005-10-30 15:03:48 -08:00
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2006-01-18 23:16:04 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:34 +02:00
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2005-04-16 15:20:36 -07:00
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2006-06-12 21:42:20 +02:00
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2005-10-08 00:04:13 +02:00
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2005-04-16 15:20:36 -07:00
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i2c: Fix the i2c_smbus_read_i2c_block_data() prototype
Let the drivers specify how many bytes they want to read with
i2c_smbus_read_i2c_block_data(). So far, the block count was
hard-coded to I2C_SMBUS_BLOCK_MAX (32), which did not make much sense.
Many driver authors complained about this before, and I believe it's
about time to fix it. Right now, authors have to do technically stupid
things, such as individual byte reads or full-fledged I2C messaging,
to work around the problem. We do not want to encourage that.
I even found that some bus drivers (e.g. i2c-amd8111) already
implemented I2C block read the "right" way, that is, they didn't
follow the old, broken standard. The fact that it was never noticed
before just shows how little i2c_smbus_read_i2c_block_data() was used,
which isn't that surprising given how broken its prototype was so far.
There are some obvious compatiblity considerations:
* This changes the i2c_smbus_read_i2c_block_data() prototype. Users
outside the kernel tree will notice at compilation time, and will
have to update their code.
* User-space has access to i2c_smbus_xfer() directly using i2c-dev, so
the changed expectations would affect tools such as i2cdump. In order
to preserve binary compatibility, we give I2C_SMBUS_I2C_BLOCK_DATA
a new numeric value, and define I2C_SMBUS_I2C_BLOCK_BROKEN with the
old numeric value. When i2c-dev receives a transaction with the
old value, it can convert it to the new format on the fly.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-07-12 14:12:29 +02:00
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2006-01-09 15:19:18 +11:00
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2006-06-12 21:42:20 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-26 20:34:05 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:30 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:30 +02:00
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2005-04-16 15:20:36 -07:00
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2007-02-13 22:09:00 +01:00
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2007-05-01 23:26:30 +02:00
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2008-04-29 23:11:39 +02:00
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2007-05-01 23:26:30 +02:00
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2007-05-01 23:26:30 +02:00
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2007-02-13 22:09:00 +01:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 23:11:39 +02:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:28 +02:00
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2007-07-12 14:12:28 +02:00
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2007-05-01 23:26:28 +02:00
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2007-07-12 14:12:28 +02:00
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2007-07-31 00:39:02 -07:00
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2007-05-01 23:26:28 +02:00
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2007-07-12 14:12:28 +02:00
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2007-05-01 23:26:30 +02:00
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2008-01-27 18:14:51 +01:00
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2007-07-31 00:39:02 -07:00
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2007-05-01 23:26:28 +02:00
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2007-07-12 14:12:28 +02:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:28 +02:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2005-07-20 00:02:32 +02:00
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2007-05-01 23:26:28 +02:00
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2005-04-16 15:20:36 -07:00
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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>
2007-05-01 23:26:31 +02:00
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2007-05-01 23:26:30 +02:00
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2008-01-27 18:14:51 +01:00
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2005-04-16 15:20:36 -07:00
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2008-01-27 18:14:51 +01:00
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2005-07-27 12:43:03 -05:00
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2007-07-12 14:12:28 +02:00
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2005-07-27 12:43:03 -05:00
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2005-04-16 15:20:36 -07:00
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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>
2007-05-01 23:26:31 +02:00
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2007-07-12 14:12:28 +02:00
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|
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|
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>
2007-05-01 23:26:31 +02:00
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2007-07-12 14:12:28 +02:00
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|
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>
2007-05-01 23:26:31 +02:00
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2008-04-29 23:11:40 +02:00
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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>
2007-05-01 23:26:31 +02:00
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2008-04-29 23:11:40 +02:00
|
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|
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>
2007-05-01 23:26:31 +02:00
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|
2008-04-29 23:11:40 +02:00
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|
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>
2007-05-01 23:26:31 +02:00
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2007-05-01 23:26:31 +02:00
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2008-01-27 18:14:52 +01:00
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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>
2007-05-01 23:26:31 +02:00
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2008-02-24 20:03:42 +01:00
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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>
2007-05-01 23:26:31 +02:00
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2008-02-24 20:03:42 +01:00
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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>
2007-05-01 23:26:31 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-07-01 17:12:53 +02:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2005-08-13 13:04:32 +02:00
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2005-04-16 15:20:36 -07:00
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2006-09-03 22:37:11 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:30 +01:00
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2006-01-18 23:16:04 +01:00
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2005-04-16 15:20:36 -07:00
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2008-01-27 18:14:51 +01:00
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2007-05-01 23:26:28 +02:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:28 +02:00
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2005-04-16 15:20:36 -07:00
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2007-10-13 23:56:29 +02:00
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2005-04-16 15:20:36 -07:00
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2008-01-27 18:14:46 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-01 23:26:31 +02:00
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2005-04-16 15:20:36 -07:00
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2005-12-06 15:33:15 -08:00
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2007-05-01 23:26:32 +02:00
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2005-04-16 15:20:36 -07:00
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2005-12-06 15:33:15 -08:00
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2005-04-16 15:20:36 -07:00
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2008-01-27 18:14:48 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2008-01-27 18:14:46 +01:00
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2005-04-16 15:20:36 -07:00
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2005-07-28 23:09:40 +02:00
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2006-04-25 14:14:52 +01:00
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2005-07-28 23:09:40 +02:00
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2007-10-13 23:56:31 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2007-10-13 23:56:31 +02:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-10-13 23:56:33 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-10-13 23:56:33 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-25 16:56:43 +02:00
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[PATCH] i2c: SMBus PEC support rewrite, 2 of 3
This is my rewrite of the SMBus PEC support. The original
implementation was known to have bugs (credits go to Hideki Iwamoto
for reporting many of them recently), and was incomplete due to a
conceptual limitation.
The rewrite affects only software PEC. Hardware PEC needs very little
code and is mostly untouched.
Technically, both implementations differ in that the original one
was emulating PEC in software by modifying the contents of an
i2c_smbus_data union (changing the transaction to a different type),
while the new one works one level lower, on i2c_msg structures (working
on message contents). Due to the definition of the i2c_smbus_data union,
not all SMBus transactions could be handled (at least not without
changing the definition of this union, which would break user-space
compatibility), and those which could had to be implemented
individually. At the opposite, adding PEC to an i2c_msg structure
can be done on any SMBus transaction with common code.
Advantages of the new implementation:
* It's about twice as small (from ~136 lines before to ~70 now, only
counting i2c-core, including blank and comment lines). The memory
used by i2c-core is down by ~640 bytes (~3.5%).
* Easier to validate, less tricky code. The code being common to all
transactions by design, the risk that a bug can stay uncovered is
lower.
* All SMBus transactions have PEC support in I2C emulation mode
(providing the non-PEC transaction is also implemented). Transactions
which have no emulation code right now will get PEC support for free
when they finally get implemented.
* Allows for code simplifications in header files and bus drivers
(patch follows).
Drawbacks (I guess there had to be at least one):
* PEC emulation for non-PEC capable non-I2C SMBus masters was dropped.
It was based on SMBus tricks and doesn't quite fit in the new design.
I don't think it's really a problem, as the benefit was certainly
not worth the additional complexity, but it's only fair that I at
least mention it.
Lastly, let's note that the new implementation does slightly affect
compatibility (both in kernel and user-space), but doesn't actually
break it. Some defines will be dropped, but the code can always be
changed in a way that will work with both the old and the new
implementations. It shouldn't be a problem as there doesn't seem to be
many users of SMBus PEC to date anyway.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-26 21:28:55 +02:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 21:21:31 +01:00
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2005-04-16 15:20:36 -07:00
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i2c: Fix the i2c_smbus_read_i2c_block_data() prototype
Let the drivers specify how many bytes they want to read with
i2c_smbus_read_i2c_block_data(). So far, the block count was
hard-coded to I2C_SMBUS_BLOCK_MAX (32), which did not make much sense.
Many driver authors complained about this before, and I believe it's
about time to fix it. Right now, authors have to do technically stupid
things, such as individual byte reads or full-fledged I2C messaging,
to work around the problem. We do not want to encourage that.
I even found that some bus drivers (e.g. i2c-amd8111) already
implemented I2C block read the "right" way, that is, they didn't
follow the old, broken standard. The fact that it was never noticed
before just shows how little i2c_smbus_read_i2c_block_data() was used,
which isn't that surprising given how broken its prototype was so far.
There are some obvious compatiblity considerations:
* This changes the i2c_smbus_read_i2c_block_data() prototype. Users
outside the kernel tree will notice at compilation time, and will
have to update their code.
* User-space has access to i2c_smbus_xfer() directly using i2c-dev, so
the changed expectations would affect tools such as i2cdump. In order
to preserve binary compatibility, we give I2C_SMBUS_I2C_BLOCK_DATA
a new numeric value, and define I2C_SMBUS_I2C_BLOCK_BROKEN with the
old numeric value. When i2c-dev receives a transaction with the
old value, it can convert it to the new format on the fly.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-07-12 14:12:29 +02:00
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2005-04-16 15:20:36 -07:00
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i2c: Fix the i2c_smbus_read_i2c_block_data() prototype
Let the drivers specify how many bytes they want to read with
i2c_smbus_read_i2c_block_data(). So far, the block count was
hard-coded to I2C_SMBUS_BLOCK_MAX (32), which did not make much sense.
Many driver authors complained about this before, and I believe it's
about time to fix it. Right now, authors have to do technically stupid
things, such as individual byte reads or full-fledged I2C messaging,
to work around the problem. We do not want to encourage that.
I even found that some bus drivers (e.g. i2c-amd8111) already
implemented I2C block read the "right" way, that is, they didn't
follow the old, broken standard. The fact that it was never noticed
before just shows how little i2c_smbus_read_i2c_block_data() was used,
which isn't that surprising given how broken its prototype was so far.
There are some obvious compatiblity considerations:
* This changes the i2c_smbus_read_i2c_block_data() prototype. Users
outside the kernel tree will notice at compilation time, and will
have to update their code.
* User-space has access to i2c_smbus_xfer() directly using i2c-dev, so
the changed expectations would affect tools such as i2cdump. In order
to preserve binary compatibility, we give I2C_SMBUS_I2C_BLOCK_DATA
a new numeric value, and define I2C_SMBUS_I2C_BLOCK_BROKEN with the
old numeric value. When i2c-dev receives a transaction with the
old value, it can convert it to the new format on the fly.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-07-12 14:12:29 +02:00
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2005-04-16 15:20:36 -07:00
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2006-04-25 14:14:52 +01:00
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2005-04-16 15:20:36 -07:00
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2005-07-31 21:49:03 +02:00
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2008-02-24 20:03:42 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2008-01-27 18:14:46 +01:00
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2005-07-31 21:49:03 +02:00
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2006-04-25 14:14:52 +01:00
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2005-04-16 15:20:36 -07:00
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