This patch adds the support of the I2C_SMBUS_I2C_BLOCK_DATA transaction type for the iSMT SMBus Controller.
Signed-off-by: Robert Valiquette <robert.valiquette@xxxxxxxxx>
---
--- a/drivers/i2c/busses/i2c-ismt.c 2013-11-14 11:36:15.830322000 -0500
+++ b/drivers/i2c/busses/i2c-ismt.c 2013-11-14 16:01:56.532356000 -0500
@@ -344,6 +344,7 @@
data->word = dma_buffer[0] | (dma_buffer[1] << 8);
break;
case I2C_SMBUS_BLOCK_DATA:
+ case I2C_SMBUS_I2C_BLOCK_DATA:
memcpy(&data->block[1], dma_buffer, desc->rxbytes);
data->block[0] = desc->rxbytes;
break;
@@ -509,6 +510,41 @@
}
break;
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ /* Make sure the lenght is valid */
+ if (data->block[0] < 1)
+ data->block[0] = 1;
+
+ if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
+ data->block[0] = I2C_SMBUS_BLOCK_MAX;
+
+ if (read_write == I2C_SMBUS_WRITE) {
+ /* i2c Block Write */
+ dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: WRITE\n");
+ dma_size = data->block[0] + 1;
+ dma_direction = DMA_TO_DEVICE;
+ desc->wr_len_cmd = dma_size;
+ desc->control |= ISMT_DESC_I2C;
+ priv->dma_buffer[0] = command;
+ memcpy(&priv->dma_buffer[1], &data->block[1], dma_size);
+ } else {
+ /* i2c Block Read */
+ dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: READ\n");
+ dma_size = data->block[0];
+ dma_direction = DMA_FROM_DEVICE;
+ desc->rd_len = dma_size;
+ desc->wr_len_cmd = command;
+ desc->control |= (ISMT_DESC_I2C | ISMT_DESC_CWRL);
+ /*
+ * Per the "Table 15-15. I2C Commands",
+ * in the External Design Specification (EDS),
+ * (Document Number: 508084, Revision: 2.0),
+ * the _rw bit must be 0
+ */
+ desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, 0);
+ }
+ break;
+
default:
dev_err(dev, "Unsupported transaction %d\n",
size);
@@ -582,6 +618,7 @@
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_PROC_CALL |
I2C_FUNC_SMBUS_BLOCK_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK |
I2C_FUNC_SMBUS_PEC;
}
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