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@@ -90,12 +90,15 @@ ioctl(file,I2C_SLAVE,long addr)
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ioctl(file,I2C_TENBIT,long select)
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Selects ten bit addresses if select not equals 0, selects normal 7 bit
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- addresses if select equals 0. Default 0.
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+ addresses if select equals 0. Default 0. This request is only valid
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+ if the adapter has I2C_FUNC_10BIT_ADDR.
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ioctl(file,I2C_PEC,long select)
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Selects SMBus PEC (packet error checking) generation and verification
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if select not equals 0, disables if select equals 0. Default 0.
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- Used only for SMBus transactions.
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+ Used only for SMBus transactions. This request only has an effect if the
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+ the adapter has I2C_FUNC_SMBUS_PEC; it is still safe if not, it just
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+ doesn't have any effect.
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ioctl(file,I2C_FUNCS,unsigned long *funcs)
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Gets the adapter functionality and puts it in *funcs.
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@@ -103,8 +106,10 @@ ioctl(file,I2C_FUNCS,unsigned long *funcs)
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ioctl(file,I2C_RDWR,struct i2c_rdwr_ioctl_data *msgset)
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Do combined read/write transaction without stop in between.
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- The argument is a pointer to a struct i2c_rdwr_ioctl_data {
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+ Only valid if the adapter has I2C_FUNC_I2C. The argument is
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+ a pointer to a
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+ struct i2c_rdwr_ioctl_data {
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struct i2c_msg *msgs; /* ptr to array of simple messages */
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int nmsgs; /* number of messages to exchange */
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}
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