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i2c: introduce helper function to get 8 bit address from a message

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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>
This commit is contained in:
Wolfram Sang 2016-04-03 20:44:45 +02:00
parent e28b124564
commit a16d6ebca6
1 changed files with 5 additions and 0 deletions
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5
include/linux/i2c.h
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@ -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