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i2c:smbus_eeprom: Add a reset function to smbus_eeprom

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Reset the contents to init data and reset the offset on a machine
reset.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Corey Minyard 2018-11-15 08:31:11 -06:00
parent fd9df33f08
commit 1042b22dcb
1 changed files with 17 additions and 1 deletions
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18
hw/i2c/smbus_eeprom.c
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@ -108,7 +108,17 @@ static const VMStateDescription vmstate_smbus_eeprom = {
}
};
static void smbus_eeprom_realize(DeviceState *dev, Error **errp)
/*
* Reset the EEPROM contents to the initial state on a reset. This
* isn't really how an EEPROM works, of course, but the general
* principle of QEMU is to restore function on reset to what it would
* be if QEMU was stopped and started.
*
* The proper thing to do would be to have a backing blockdev to hold
* the contents and restore that on startup, and not do this on reset.
* But until that time, act as if we had been stopped and restarted.
*/
static void smbus_eeprom_reset(DeviceState *dev)
{
SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
@ -116,6 +126,11 @@ static void smbus_eeprom_realize(DeviceState *dev, Error **errp)
eeprom->offset = 0;
}
static void smbus_eeprom_realize(DeviceState *dev, Error **errp)
{
smbus_eeprom_reset(dev);
}
static Property smbus_eeprom_properties[] = {
DEFINE_PROP_PTR("data", SMBusEEPROMDevice, init_data),
DEFINE_PROP_END_OF_LIST(),
@ -127,6 +142,7 @@ static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data)
SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass);
dc->realize = smbus_eeprom_realize;
dc->reset = smbus_eeprom_reset;
sc->receive_byte = eeprom_receive_byte;
sc->write_data = eeprom_write_data;
dc->props = smbus_eeprom_properties;