/**
* ismt_desc_dump() - dump the contents of a descriptor for debug purposes
* @priv: iSMT private data
*/
static void ismt_desc_dump(struct ismt_priv *priv)
{
struct device *dev = &priv->pci_dev->dev;
struct ismt_desc *desc = &priv->hw[priv->head];
dev_dbg(dev, "Dump of the descriptor struct: 0x%X\n", priv->head);
__ismt_desc_dump(dev, desc);
}
/**
* ismt_process_desc() - handle the completion of the descriptor
* @desc: the iSMT hardware descriptor
* @data: data buffer from the upper layer
* @priv: ismt_priv struct holding our dma buffer
* @size: SMBus transaction type
* @read_write: flag to indicate if this is a read or write
*/
static int ismt_process_desc(const struct ismt_desc *desc,
union i2c_smbus_data *data,
struct ismt_priv *priv, int size,
char read_write)
{
u8 *dma_buffer = priv->dma_buffer;
dev_dbg(&priv->pci_dev->dev, "Processing completed descriptor\n");
__ismt_desc_dump(&priv->pci_dev->dev, desc);
if (desc->status & ISMT_DESC_SCS) {
if (read_write == I2C_SMBUS_WRITE &&
size != I2C_SMBUS_PROC_CALL)
return 0;
switch (size) {
case I2C_SMBUS_BYTE:
case I2C_SMBUS_BYTE_DATA:
data->byte = dma_buffer[0];
break;
case I2C_SMBUS_WORD_DATA:
case I2C_SMBUS_PROC_CALL:
data->word = dma_buffer[0] | (dma_buffer[1] << 8);
break;
case I2C_SMBUS_BLOCK_DATA:
if (desc->rxbytes != dma_buffer[0] + 1)
return -EMSGSIZE;
memcpy(data->block, dma_buffer, desc->rxbytes);
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
memcpy(&data->block[1], dma_buffer, desc->rxbytes);
data->block[0] = desc->rxbytes;
break;
}
return 0;
}
if (likely(desc->status & ISMT_DESC_NAK))
return -ENXIO;
if (desc->status & ISMT_DESC_CRC)
return -EBADMSG;
if (desc->status & ISMT_DESC_COL)
return -EAGAIN;
if (desc->status & ISMT_DESC_LPR)
return -EPROTO;
if (desc->status & (ISMT_DESC_DLTO | ISMT_DESC_CLTO))
return -ETIMEDOUT;
return -EIO;
}