diff mbox series

[v2,09/10] i2c: Add an SMBus vmstate structure

Message ID 1534796770-10295-10-git-send-email-minyard@acm.org
State New
Headers show
Series Make the pm_smbus code more correct | expand

Commit Message

Corey Minyard Aug. 20, 2018, 8:26 p.m. UTC 
From: Corey Minyard <cminyard@mvista.com>

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>
---
 hw/i2c/smbus.c         | 14 ++++++++++++++
 include/hw/i2c/smbus.h | 18 +++++++++++++++---
 2 files changed, 29 insertions(+), 3 deletions(-)

Comments

Dr. David Alan Gilbert Aug. 29, 2018, 11:59 a.m. UTC | #1 
* minyard@acm.org (minyard@acm.org) wrote:
> From: Corey Minyard <cminyard@mvista.com>
> 
> 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>
> ---
>  hw/i2c/smbus.c         | 14 ++++++++++++++
>  include/hw/i2c/smbus.h | 18 +++++++++++++++---
>  2 files changed, 29 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i2c/smbus.c b/hw/i2c/smbus.c
> index 6ff77c5..b0774d7 100644
> --- a/hw/i2c/smbus.c
> +++ b/hw/i2c/smbus.c
> @@ -349,6 +349,20 @@ int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
>      return 0;
>  }
>  
> +const VMStateDescription vmstate_smbus_device = {
> +    .name = TYPE_SMBUS_DEVICE,
> +    .version_id = 1,
> +    .minimum_version_id = 1,

As with the other patch, I suggest the .needed and property to enable it
only for newer machine types.

> +    .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_UINT8(command, SMBusDevice),

Do you need a post_load  to validate that data_len isn't silly?
Maybe command/mode also need checks.

Dave

> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>  static void smbus_device_class_init(ObjectClass *klass, void *data)
>  {
>      I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
> diff --git a/include/hw/i2c/smbus.h b/include/hw/i2c/smbus.h
> index d8b1b9e..7b52020 100644
> --- a/include/hw/i2c/smbus.h
> +++ b/include/hw/i2c/smbus.h
> @@ -53,14 +53,16 @@ typedef struct SMBusDeviceClass
>      uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
>  } 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];
>      uint8_t command;
>  };
>  
> @@ -93,4 +95,14 @@ void smbus_eeprom_init_one(I2CBus *smbus, uint8_t address, uint8_t *eeprom_buf);
>  void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
>                         const uint8_t *eeprom_spd, int size);
>  
> +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), \
> +}
> +
>  #endif
> -- 
> 2.7.4
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
diff mbox series

Patch

diff --git a/hw/i2c/smbus.c b/hw/i2c/smbus.c
index 6ff77c5..b0774d7 100644
--- a/hw/i2c/smbus.c
+++ b/hw/i2c/smbus.c
@@ -349,6 +349,20 @@  int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
     return 0;
 }
 
+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_UINT8(command, SMBusDevice),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void smbus_device_class_init(ObjectClass *klass, void *data)
 {
     I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
diff --git a/include/hw/i2c/smbus.h b/include/hw/i2c/smbus.h
index d8b1b9e..7b52020 100644
--- a/include/hw/i2c/smbus.h
+++ b/include/hw/i2c/smbus.h
@@ -53,14 +53,16 @@  typedef struct SMBusDeviceClass
     uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
 } 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];
     uint8_t command;
 };
 
@@ -93,4 +95,14 @@  void smbus_eeprom_init_one(I2CBus *smbus, uint8_t address, uint8_t *eeprom_buf);
 void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
                        const uint8_t *eeprom_spd, int size);
 
+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), \
+}
+
 #endif