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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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4
hw/i2c/i2c-ddc.c
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@ -230,13 +230,15 @@ static void i2c_ddc_reset(DeviceState *ds)
s->reg = 0;
}
static void i2c_ddc_event(I2CSlave *i2c, enum i2c_event event)
static int i2c_ddc_event(I2CSlave *i2c, enum i2c_event event)
{
I2CDDCState *s = I2CDDC(i2c);
if (event == I2C_START_SEND) {
s->firstbyte = true;
}
return 0;
}
static int i2c_ddc_rx(I2CSlave *i2c)