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Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging

Browse source 
Pull i2c updates from Jean Delvare.

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING
  i2c-dev: Add support for I2C_M_RECV_LEN
This commit is contained in:
Linus Torvalds 2012-05-30 10:03:46 -07:00
commit 42fe55ce90
10 changed files with 51 additions and 14 deletions
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9
Documentation/i2c/functionality
View file

@ -18,9 +18,9 @@ For the most up-to-date list of functionality constants, please check
adapters typically can not do these)
I2C_FUNC_10BIT_ADDR Handles the 10-bit address extensions
I2C_FUNC_PROTOCOL_MANGLING Knows about the I2C_M_IGNORE_NAK,
I2C_M_REV_DIR_ADDR, I2C_M_NOSTART and
I2C_M_NO_RD_ACK flags (which modify the
I2C protocol!)
I2C_M_REV_DIR_ADDR and I2C_M_NO_RD_ACK
flags (which modify the I2C protocol!)
I2C_FUNC_NOSTART Can skip repeated start sequence
I2C_FUNC_SMBUS_QUICK Handles the SMBus write_quick command
I2C_FUNC_SMBUS_READ_BYTE Handles the SMBus read_byte command
I2C_FUNC_SMBUS_WRITE_BYTE Handles the SMBus write_byte command
@ -50,6 +50,9 @@ A few combinations of the above flags are also defined for your convenience:
emulated by a real I2C adapter (using
the transparent emulation layer)
In kernel versions prior to 3.5 I2C_FUNC_NOSTART was implemented as
part of I2C_FUNC_PROTOCOL_MANGLING.
ADAPTER IMPLEMENTATION
----------------------

9
Documentation/i2c/i2c-protocol
View file

@ -49,7 +49,9 @@ a byte read, followed by a byte write:
Modified transactions
=====================
We have found some I2C devices that needs the following modifications:
The following modifications to the I2C protocol can also be generated,
with the exception of I2C_M_NOSTART these are usually only needed to
work around device issues:
Flag I2C_M_NOSTART:
In a combined transaction, no 'S Addr Wr/Rd [A]' is generated at some
@ -60,6 +62,11 @@ We have found some I2C devices that needs the following modifications:
we do not generate Addr, but we do generate the startbit S. This will
probably confuse all other clients on your bus, so don't try this.
This is often used to gather transmits from multiple data buffers in
system memory into something that appears as a single transfer to the
I2C device but may also be used between direction changes by some
rare devices.
Flags I2C_M_REV_DIR_ADDR
This toggles the Rd/Wr flag. That is, if you want to do a write, but
need to emit an Rd instead of a Wr, or vice versa, you set this