diff options
| author | robert.valiquette@intel.com <robert.valiquette@intel.com> | 2013-11-15 01:52:30 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-01-13 17:45:33 +0100 |
| commit | 001cebf03f918c85404cb76db3a60c748be5efb5 (patch) | |
| tree | 7f7510e039ae92827684e5729185911d817ef056 | |
| parent | i2c: Add bus driver for for OSIF USB i2c device. (diff) | |
| download | linux-001cebf03f918c85404cb76db3a60c748be5efb5.tar.xz linux-001cebf03f918c85404cb76db3a60c748be5efb5.zip | |
i2c-ismt: support I2C_SMBUS_I2C_BLOCK_DATA transaction type
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@intel.com>
Acked-by: Seth Heasley <seth.heasley@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-ismt.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c index 0043ede234c2..bb132ea7d2b4 100644 --- a/drivers/i2c/busses/i2c-ismt.c +++ b/drivers/i2c/busses/i2c-ismt.c @@ -344,6 +344,7 @@ static int ismt_process_desc(const struct ismt_desc *desc, 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 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, } break; + case I2C_SMBUS_I2C_BLOCK_DATA: + /* Make sure the length 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 @@ static u32 ismt_func(struct i2c_adapter *adap) I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA | + I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC; } |