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i2c: Allow I2C devices to NAK start events

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Add a return value to the event handler.  Some I2C devices will
NAK if they have no data, so allow them to do this.  This required
the following changes:

Go through all the event handlers and change them to return int
and return 0.

Modify i2c_start_transfer to terminate the transaction on a NAK.

Modify smbus handing to not assert if a NAK occurs on a second
operation, and terminate the transaction and return -1 instead.

Add some information on semantics to I2CSlaveClass.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Corey Minyard 2017-01-09 11:40:20 +00:00 • committed by Peter Maydell
parent ffe22bf510
commit d307c28ca9
14 changed files with 79 additions and 26 deletions
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3
hw/misc/tmp105.c
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@ -176,7 +176,7 @@ static int tmp105_tx(I2CSlave *i2c, uint8_t data)
return 0;
}
static void tmp105_event(I2CSlave *i2c, enum i2c_event event)
static int tmp105_event(I2CSlave *i2c, enum i2c_event event)
{
TMP105State *s = TMP105(i2c);
@ -185,6 +185,7 @@ static void tmp105_event(I2CSlave *i2c, enum i2c_event event)
}
s->len = 0;
return 0;
}
static int tmp105_post_load(void *opaque, int version_id)