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| author | Wolfram Sang <wsa@the-dreams.de> | 2016-04-03 20:44:45 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-04-11 18:54:59 +0200 |
| commit | a16d6ebca6efb73f6402f36e5aebf84f61721856 (patch) | |
| tree | 149558debefac59bc26ea8576972d804f4354ab1 | |
| parent | e28b124564e648d933337a0708dae1323c518af7 (diff) | |
| download | op-kernel-dev-a16d6ebca6efb73f6402f36e5aebf84f61721856.zip op-kernel-dev-a16d6ebca6efb73f6402f36e5aebf84f61721856.tar.gz | |
i2c: introduce helper function to get 8 bit address from a message
Drivers do this in various ways, let's use one standard way of doing it.
Note: I2C_M_RD is bit 0, so the code could be simplified. To be extremly
robust and to advertise good coding practices, I still use the ternary
operator and let the compilers do the optimizing job.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | include/linux/i2c.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 200cf13b..c30833b 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -654,6 +654,11 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap) return adap->nr; } +static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) +{ + return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0); +} + /** * module_i2c_driver() - Helper macro for registering a modular I2C driver * @__i2c_driver: i2c_driver struct |
