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[Qemu-devel] [PATCH v2 08/12] i2c: Add an SMBus vmstate structure
From: |
minyard |
Subject: |
[Qemu-devel] [PATCH v2 08/12] i2c: Add an SMBus vmstate structure |
Date: |
Thu, 15 Nov 2018 13:24:42 -0600 |
From: Corey Minyard <address@hidden>
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 <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: Michael S. Tsirkin <address@hidden>
Cc: Dr. David Alan Gilbert <address@hidden>
---
hw/i2c/smbus_slave.c | 18 ++++++++++++++++++
include/hw/i2c/smbus_slave.h | 24 +++++++++++++++++++++---
2 files changed, 39 insertions(+), 3 deletions(-)
diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c
index fa988919d8..b8a2d521f4 100644
--- a/hw/i2c/smbus_slave.c
+++ b/hw/i2c/smbus_slave.c
@@ -206,6 +206,24 @@ 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,
diff --git a/include/hw/i2c/smbus_slave.h b/include/hw/i2c/smbus_slave.h
index eabac1dd73..d53d691bf6 100644
--- a/include/hw/i2c/smbus_slave.h
+++ b/include/hw/i2c/smbus_slave.h
@@ -75,14 +75,32 @@ typedef struct SMBusDeviceClass
void (*transaction_complete)(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
--
2.17.1
- Re: [Qemu-devel] [PATCH v2 04/12] i2c: Add a length check to the SMBus write handling, (continued)
[Qemu-devel] [PATCH v2 02/12] i2c: have I2C receive operation return uint8_t, minyard, 2018/11/15
[Qemu-devel] [PATCH v2 05/12] i2c: Fix pm_smbus handling of I2C block read, minyard, 2018/11/15
[Qemu-devel] [PATCH v2 08/12] i2c: Add an SMBus vmstate structure,
minyard <=
[Qemu-devel] [PATCH v2 07/12] i2c:pm_smbus: Fix state transfer, minyard, 2018/11/15
[Qemu-devel] [PATCH v2 06/12] boards.h: Ignore migration for SMBus devices on older machines, minyard, 2018/11/15