diff options
author | Corey Minyard <cminyard@mvista.com> | 2017-01-09 11:40:20 +0000 |
---|---|---|
committer | Peter Maydell <peter.maydell@linaro.org> | 2017-01-09 11:40:20 +0000 |
commit | d307c28ca9dba7a0677035c9244198b05164c873 (patch) | |
tree | ee942307fac668f7a2d531bf6b86e6db025cdfd0 /hw/arm/pxa2xx.c | |
parent | ffe22bf51065dd33022cf91f77a821d1f11c250d (diff) |
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/pxa2xx.c')
-rw-r--r-- | hw/arm/pxa2xx.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/hw/arm/pxa2xx.c b/hw/arm/pxa2xx.c index bdcf6bcce7..d31b4577f0 100644 --- a/hw/arm/pxa2xx.c +++ b/hw/arm/pxa2xx.c @@ -1258,7 +1258,7 @@ static void pxa2xx_i2c_update(PXA2xxI2CState *s) } /* These are only stubs now. */ -static void pxa2xx_i2c_event(I2CSlave *i2c, enum i2c_event event) +static int pxa2xx_i2c_event(I2CSlave *i2c, enum i2c_event event) { PXA2xxI2CSlaveState *slave = PXA2XX_I2C_SLAVE(i2c); PXA2xxI2CState *s = slave->host; @@ -1280,6 +1280,8 @@ static void pxa2xx_i2c_event(I2CSlave *i2c, enum i2c_event event) break; } pxa2xx_i2c_update(s); + + return 0; } static int pxa2xx_i2c_rx(I2CSlave *i2c) |