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authorCorey Minyard <cminyard@mvista.com>2017-01-09 11:40:20 +0000
committerPeter Maydell <peter.maydell@linaro.org>2017-01-09 11:40:20 +0000
commitd307c28ca9dba7a0677035c9244198b05164c873 (patch)
treeee942307fac668f7a2d531bf6b86e6db025cdfd0 /hw/arm/tosa.c
parentffe22bf51065dd33022cf91f77a821d1f11c250d (diff)
downloadqemu-arm-d307c28ca9dba7a0677035c9244198b05164c873.tar.gz
i2c: Allow I2C devices to NAK start events
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>
Diffstat (limited to 'hw/arm/tosa.c')
-rw-r--r--hw/arm/tosa.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/hw/arm/tosa.c b/hw/arm/tosa.c
index 39d9dbbae6..c3db996930 100644
--- a/hw/arm/tosa.c
+++ b/hw/arm/tosa.c
@@ -172,7 +172,7 @@ static int tosa_dac_send(I2CSlave *i2c, uint8_t data)
return 0;
}
-static void tosa_dac_event(I2CSlave *i2c, enum i2c_event event)
+static int tosa_dac_event(I2CSlave *i2c, enum i2c_event event)
{
TosaDACState *s = TOSA_DAC(i2c);
@@ -194,6 +194,8 @@ static void tosa_dac_event(I2CSlave *i2c, enum i2c_event event)
default:
break;
}
+
+ return 0;
}
static int tosa_dac_recv(I2CSlave *s)