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i2c:smbus_slave: Add an SMBus vmstate structure

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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
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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