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i2c:smbus_slave: Add an SMBus vmstate structure 

There is no vmstate handling for SMBus, so no device sitting on SMBus
can have a state transfer that works reliably.  So add it.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Corey Minyard 2017-12-07 09:34:59 -06:00
parent 4ab2f2a8aa
commit 547db24a17
2 changed files with 39 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
hw/i2c/smbus_slave.c
View File

@ -201,6 +201,24 @@ static void smbus_device_class_init(ObjectClass *klass, void *data)
sc->send = smbus_i2c_send;
}
bool smbus_vmstate_needed(SMBusDevice *dev)
{
return dev->mode != SMBUS_IDLE;
}
const VMStateDescription vmstate_smbus_device = {
.name = TYPE_SMBUS_DEVICE,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_I2C_SLAVE(i2c, SMBusDevice),
VMSTATE_INT32(mode, SMBusDevice),
VMSTATE_INT32(data_len, SMBusDevice),
VMSTATE_UINT8_ARRAY(data_buf, SMBusDevice, SMBUS_DATA_MAX_LEN),
VMSTATE_END_OF_LIST()
}
};
static const TypeInfo smbus_device_type_info = {
.name = TYPE_SMBUS_DEVICE,
.parent = TYPE_I2C_SLAVE,

24
include/hw/i2c/smbus_slave.h
View File

@ -69,14 +69,32 @@ typedef struct SMBusDeviceClass
uint8_t (*receive_byte)(SMBusDevice *dev);
} SMBusDeviceClass;
#define SMBUS_DATA_MAX_LEN 34 /* command + len + 32 bytes of data. */
struct SMBusDevice {
/* The SMBus protocol is implemented on top of I2C. */
I2CSlave i2c;
/* Remaining fields for internal use only. */
int mode;
int data_len;
uint8_t data_buf[34]; /* command + len + 32 bytes of data. */
int32_t mode;
int32_t data_len;
uint8_t data_buf[SMBUS_DATA_MAX_LEN];
};
extern const VMStateDescription vmstate_smbus_device;
#define VMSTATE_SMBUS_DEVICE(_field, _state) { \
.name = (stringify(_field)), \
.size = sizeof(SMBusDevice), \
.vmsd = &vmstate_smbus_device, \
.flags = VMS_STRUCT, \
.offset = vmstate_offset_value(_state, _field, SMBusDevice), \
}
/*
* Users should call this in their .needed functions to know if the
* SMBus slave data needs to be transferred.
*/
bool smbus_vmstate_needed(SMBusDevice *dev);
#endif