Commit a16d6ebc authored Apr 03, 2016 by Wolfram Sang

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>

parent e28b1245

include/linux/i2c.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -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

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