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i2c-designware: Tx abort cleanups

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* ABRT_MASTER_DIS: Fix a typo.

* i2c_dw_handle_tx_abort: Return an appropriate error number
  depending on abort_source.

* i2c_dw_xfer: Add a missing abort_source initialization.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Shinya Kuribayashi 2009-11-06 21:51:57 +09:00 committed by Ben Dooks
parent 597fe310f1
commit ce6eb574a1
1 changed files with 40 additions and 7 deletions
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47
drivers/i2c/busses/i2c-designware.c
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@ -123,9 +123,27 @@
#define ABRT_SBYTE_ACKDET 7
#define ABRT_SBYTE_NORSTRT 9
#define ABRT_10B_RD_NORSTRT 10
#define ARB_MASTER_DIS 11
#define ABRT_MASTER_DIS 11
#define ARB_LOST 12
#define DW_IC_TX_ABRT_7B_ADDR_NOACK (1UL << ABRT_7B_ADDR_NOACK)
#define DW_IC_TX_ABRT_10ADDR1_NOACK (1UL << ABRT_10ADDR1_NOACK)
#define DW_IC_TX_ABRT_10ADDR2_NOACK (1UL << ABRT_10ADDR2_NOACK)
#define DW_IC_TX_ABRT_TXDATA_NOACK (1UL << ABRT_TXDATA_NOACK)
#define DW_IC_TX_ABRT_GCALL_NOACK (1UL << ABRT_GCALL_NOACK)
#define DW_IC_TX_ABRT_GCALL_READ (1UL << ABRT_GCALL_READ)
#define DW_IC_TX_ABRT_SBYTE_ACKDET (1UL << ABRT_SBYTE_ACKDET)
#define DW_IC_TX_ABRT_SBYTE_NORSTRT (1UL << ABRT_SBYTE_NORSTRT)
#define DW_IC_TX_ABRT_10B_RD_NORSTRT (1UL << ABRT_10B_RD_NORSTRT)
#define DW_IC_TX_ABRT_MASTER_DIS (1UL << ABRT_MASTER_DIS)
#define DW_IC_TX_ARB_LOST (1UL << ARB_LOST)
#define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
DW_IC_TX_ABRT_10ADDR1_NOACK | \
DW_IC_TX_ABRT_10ADDR2_NOACK | \
DW_IC_TX_ABRT_TXDATA_NOACK | \
DW_IC_TX_ABRT_GCALL_NOACK)
static char *abort_sources[] = {
[ABRT_7B_ADDR_NOACK] =
"slave address not acknowledged (7bit mode)",
@ -472,6 +490,24 @@ i2c_dw_read(struct dw_i2c_dev *dev)
}
}
static int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev)
{
unsigned long abort_source = dev->abort_source;
int i;
for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources))
dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
if (abort_source & DW_IC_TX_ARB_LOST)
return -EAGAIN;
else if (abort_source & DW_IC_TX_ABRT_NOACK)
return -EREMOTEIO;
else if (abort_source & DW_IC_TX_ABRT_GCALL_READ)
return -EINVAL; /* wrong msgs[] data */
else
return -EIO;
}
/*
* Prepare controller for a transaction and call i2c_dw_xfer_msg
*/
@ -493,6 +529,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
dev->msg_read_idx = 0;
dev->msg_err = 0;
dev->status = STATUS_IDLE;
dev->abort_source = 0;
ret = i2c_dw_wait_bus_not_busy(dev);
if (ret < 0)
@ -526,12 +563,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
/* We have an error */
if (dev->cmd_err == DW_IC_ERR_TX_ABRT) {
unsigned long abort_source = dev->abort_source;
int i;
for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources)) {
dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
}
ret = i2c_dw_handle_tx_abort(dev);
goto done;
}
ret = -EIO;