C++ (Cpp) i2c_dw_handle_tx_abort Examples

Example #1

File: i2c-designware-master.c Project: avagin/linux

/*
 * Prepare controller for a transaction and call i2c_dw_xfer_msg.
 */
static int
i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
{
	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
	int ret;

	dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);

	pm_runtime_get_sync(dev->dev);

	if (dev_WARN_ONCE(dev->dev, dev->suspended, "Transfer while suspended\n")) {
		ret = -ESHUTDOWN;
		goto done_nolock;
	}

	reinit_completion(&dev->cmd_complete);
	dev->msgs = msgs;
	dev->msgs_num = num;
	dev->cmd_err = 0;
	dev->msg_write_idx = 0;
	dev->msg_read_idx = 0;
	dev->msg_err = 0;
	dev->status = STATUS_IDLE;
	dev->abort_source = 0;
	dev->rx_outstanding = 0;

	ret = i2c_dw_acquire_lock(dev);
	if (ret)
		goto done_nolock;

	ret = i2c_dw_wait_bus_not_busy(dev);
	if (ret < 0)
		goto done;

	/* Start the transfers */
	i2c_dw_xfer_init(dev);

	/* Wait for tx to complete */
	if (!wait_for_completion_timeout(&dev->cmd_complete, adap->timeout)) {
		dev_err(dev->dev, "controller timed out\n");
		/* i2c_dw_init implicitly disables the adapter */
		i2c_recover_bus(&dev->adapter);
		i2c_dw_init_master(dev);
		ret = -ETIMEDOUT;
		goto done;
	}

	/*
	 * We must disable the adapter before returning and signaling the end
	 * of the current transfer. Otherwise the hardware might continue
	 * generating interrupts which in turn causes a race condition with
	 * the following transfer.  Needs some more investigation if the
	 * additional interrupts are a hardware bug or this driver doesn't
	 * handle them correctly yet.
	 */
	__i2c_dw_disable_nowait(dev);

	if (dev->msg_err) {
		ret = dev->msg_err;
		goto done;
	}

	/* No error */
	if (likely(!dev->cmd_err && !dev->status)) {
		ret = num;
		goto done;
	}

	/* We have an error */
	if (dev->cmd_err == DW_IC_ERR_TX_ABRT) {
		ret = i2c_dw_handle_tx_abort(dev);
		goto done;
	}

	if (dev->status)
		dev_err(dev->dev,
			"transfer terminated early - interrupt latency too high?\n");

	ret = -EIO;

done:
	i2c_dw_release_lock(dev);

done_nolock:
	pm_runtime_mark_last_busy(dev->dev);
	pm_runtime_put_autosuspend(dev->dev);

	return ret;
}

Example #2

File: i2c-designware-core.c Project: alessandroste/testBSP

/*
 * Prepare controller for a transaction and call i2c_dw_xfer_msg
 */
int
i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
{
	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
	int ret;

	dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);

	mutex_lock(&dev->lock);
	pm_runtime_get_sync(dev->dev);

	INIT_COMPLETION(dev->cmd_complete);
	dev->msgs = msgs;
	dev->msgs_num = num;
	dev->cmd_err = 0;
	dev->msg_write_idx = 0;
	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)
		goto done;

	/* start the transfers */
	i2c_dw_xfer_init(dev);

	/* wait for tx to complete */
//	ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ);
	ret = wait_for_completion_timeout(&dev->cmd_complete, HZ);
	if (ret == 0) {
		dev_err(dev->dev, "controller timed out\n");
		i2c_dw_init(dev);
		ret = -ETIMEDOUT;
		goto done;
	} else if (ret < 0)
		goto done;

	if (dev->msg_err) {
		ret = dev->msg_err;
		goto done;
	}

	/* no error */
	if (likely(!dev->cmd_err)) {
		/* Disable the adapter */
		dw_writel(dev, 0, DW_IC_ENABLE);
		ret = num;
		goto done;
	}

	/* We have an error */
	if (dev->cmd_err == DW_IC_ERR_TX_ABRT) {
		ret = i2c_dw_handle_tx_abort(dev);
		goto done;
	}
	ret = -EIO;

done:
	pm_runtime_put(dev->dev);
	mutex_unlock(&dev->lock);

	return ret;
}