[PATCH v6 14/35] i2c: tegra: Clean up probe function

[Dmitry Osipenko <digetx@gmail.com>]

The driver's probe function code is a bit difficult to read. This patch
reorders code of the probe function, forming groups of code that are easy
to work with.

The probe tear-down order now matches the driver-removal order.

All dev/&pdev->dev are replaced with i2c_dev->dev in order to have uniform
code style across the driver.

The "ret" variable renamed to "err" since it only carries error code and
the new name clearly shows that.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/i2c/busses/i2c-tegra.c | 141 +++++++++++++++++----------------
 1 file changed, 71 insertions(+), 70 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index e20937041504..01637e1fccde 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -440,6 +440,9 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
 
 	i2c_dev->tx_dma_chan = chan;
 
+	i2c_dev->dma_buf_size = i2c_dev->hw->quirks->max_write_len +
+				I2C_PACKET_HEADER_SIZE;
+
 	dma_buf = dma_alloc_coherent(i2c_dev->dev, i2c_dev->dma_buf_size,
 				     &dma_phys, GFP_KERNEL | __GFP_NOWARN);
 	if (!dma_buf) {
@@ -1690,38 +1693,45 @@ static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
 
 static int tegra_i2c_probe(struct platform_device *pdev)
 {
-	struct device *dev = &pdev->dev;
 	struct tegra_i2c_dev *i2c_dev;
 	struct resource *res;
-	void __iomem *base;
-	phys_addr_t base_phys;
-	int irq;
-	int ret;
-
-	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-	if (IS_ERR(base))
-		return PTR_ERR(base);
-
-	base_phys = res->start;
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
+	int err;
 
 	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
 	if (!i2c_dev)
 		return -ENOMEM;
 
-	i2c_dev->base = base;
-	i2c_dev->base_phys = base_phys;
-	i2c_dev->adapter.algo = &tegra_i2c_algo;
-	i2c_dev->adapter.retries = 1;
-	i2c_dev->adapter.timeout = 6 * HZ;
-	i2c_dev->irq = irq;
+	platform_set_drvdata(pdev, i2c_dev);
+
+	init_completion(&i2c_dev->msg_complete);
+	init_completion(&i2c_dev->dma_complete);
+
+	i2c_dev->hw = of_device_get_match_data(&pdev->dev);
 	i2c_dev->cont_id = pdev->id;
 	i2c_dev->dev = &pdev->dev;
 
-	i2c_dev->rst = devm_reset_control_get_exclusive(&pdev->dev, "i2c");
+	i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(i2c_dev->base))
+		return PTR_ERR(i2c_dev->base);
+
+	i2c_dev->base_phys = res->start;
+
+	err = platform_get_irq(pdev, 0);
+	if (err < 0)
+		return err;
+
+	i2c_dev->irq = err;
+
+	/* interrupt will be enabled during of transfer time */
+	irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
+
+	err = devm_request_irq(i2c_dev->dev, i2c_dev->irq, tegra_i2c_isr,
+			       IRQF_NO_SUSPEND, dev_name(i2c_dev->dev),
+			       i2c_dev);
+	if (err)
+		return err;
+
+	i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c");
 	if (IS_ERR(i2c_dev->rst)) {
 		dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst),
 			      "failed to get reset control\n");
@@ -1730,18 +1740,13 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 
 	tegra_i2c_parse_dt(i2c_dev);
 
-	ret = tegra_i2c_init_clocks(i2c_dev);
-	if (ret)
-		return ret;
-
-	i2c_dev->hw = of_device_get_match_data(&pdev->dev);
-	i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
-	i2c_dev->dma_buf_size = i2c_dev->adapter.quirks->max_write_len +
-				I2C_PACKET_HEADER_SIZE;
-	init_completion(&i2c_dev->msg_complete);
-	init_completion(&i2c_dev->dma_complete);
+	err = tegra_i2c_init_clocks(i2c_dev);
+	if (err)
+		return err;
 
-	platform_set_drvdata(pdev, i2c_dev);
+	err = tegra_i2c_init_dma(i2c_dev);
+	if (err)
+		goto release_clocks;
 
 	/*
 	 * VI I2C is in VE power domain which is not always on and not
@@ -1751,60 +1756,56 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	 * not be used for atomic transfers.
 	 */
 	if (!i2c_dev->is_vi)
-		pm_runtime_irq_safe(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
-	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0) {
-		dev_err(dev, "runtime resume failed\n");
-		goto put_rpm;
-	}
+		pm_runtime_irq_safe(i2c_dev->dev);
 
-	if (i2c_dev->hw->supports_bus_clear)
-		i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
+	pm_runtime_enable(i2c_dev->dev);
 
-	ret = tegra_i2c_init_dma(i2c_dev);
-	if (ret < 0)
+	err = pm_runtime_get_sync(i2c_dev->dev);
+	if (err < 0) {
+		dev_err(i2c_dev->dev, "runtime resume failed: %d\n", err);
 		goto put_rpm;
-
-	ret = tegra_i2c_init(i2c_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to initialize i2c controller\n");
-		goto release_dma;
 	}
 
-	irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
-
-	ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
-			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), i2c_dev);
-	if (ret)
-		goto release_dma;
+	/* initialize hardware state */
+	err = tegra_i2c_init(i2c_dev);
+	if (err)
+		goto put_rpm;
 
-	i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
+	i2c_dev->adapter.dev.of_node = i2c_dev->dev->of_node;
+	i2c_dev->adapter.dev.parent = i2c_dev->dev;
+	i2c_dev->adapter.retries = 1;
+	i2c_dev->adapter.timeout = 6 * HZ;
+	i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
 	i2c_dev->adapter.owner = THIS_MODULE;
 	i2c_dev->adapter.class = I2C_CLASS_DEPRECATED;
-	strlcpy(i2c_dev->adapter.name, dev_name(&pdev->dev),
+	i2c_dev->adapter.algo = &tegra_i2c_algo;
+	i2c_dev->adapter.nr = i2c_dev->cont_id;
+
+	if (i2c_dev->hw->supports_bus_clear)
+		i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
+
+	strlcpy(i2c_dev->adapter.name, dev_name(i2c_dev->dev),
 		sizeof(i2c_dev->adapter.name));
-	i2c_dev->adapter.dev.parent = &pdev->dev;
-	i2c_dev->adapter.nr = pdev->id;
-	i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
 
-	ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
-	if (ret)
-		goto release_dma;
+	i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
 
-	pm_runtime_put(&pdev->dev);
+	err = i2c_add_numbered_adapter(&i2c_dev->adapter);
+	if (err)
+		goto put_rpm;
 
-	return 0;
+	pm_runtime_put(i2c_dev->dev);
 
-release_dma:
-	tegra_i2c_release_dma(i2c_dev);
+	return 0;
 
 put_rpm:
-	pm_runtime_put_sync(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put(i2c_dev->dev);
+	pm_runtime_disable(i2c_dev->dev);
+
+	tegra_i2c_release_dma(i2c_dev);
+release_clocks:
 	tegra_i2c_release_clocks(i2c_dev);
 
-	return ret;
+	return err;
 }
 
 static int tegra_i2c_remove(struct platform_device *pdev)
-- 
2.27.0