i2c-designware: move to managed functions (devm_*)

This makes the error handling much more simpler than open-coding everything
and in addition makes the probe function smaller and tidier.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 19 insertions, 54 deletions

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 0ceb6e1b0f65..c53a3127f694 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -92,7 +92,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
 {
         struct dw_i2c_dev *dev;
         struct i2c_adapter *adap;
-        struct resource *mem, *ioarea;
+        struct resource *mem;
         int irq, r;
 
         /* NOTE: driver uses the static register mapping */
@@ -108,32 +108,25 @@ static int dw_i2c_probe(struct platform_device *pdev)
                 return irq; /* -ENXIO */
         }
 
-        ioarea = request_mem_region(mem->start, resource_size(mem),
-                        pdev->name);
-        if (!ioarea) {
-                dev_err(&pdev->dev, "I2C region already claimed\n");
-                return -EBUSY;
-        }
+        dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+        if (!dev)
+                return -ENOMEM;
 
-        dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
-        if (!dev) {
-                r = -ENOMEM;
-                goto err_release_region;
-        }
+        dev->base = devm_ioremap_resource(&pdev->dev, mem);
+        if (IS_ERR(dev->base))
+                return PTR_ERR(dev->base);
 
         init_completion(&dev->cmd_complete);
         mutex_init(&dev->lock);
-        dev->dev = get_device(&pdev->dev);
+        dev->dev = &pdev->dev;
         dev->irq = irq;
         platform_set_drvdata(pdev, dev);
 
-        dev->clk = clk_get(&pdev->dev, NULL);
+        dev->clk = devm_clk_get(&pdev->dev, NULL);
         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 
-        if (IS_ERR(dev->clk)) {
-                r = -ENODEV;
-                goto err_free_mem;
-        }
+        if (IS_ERR(dev->clk))
+                return PTR_ERR(dev->clk);
         clk_prepare_enable(dev->clk);
 
         dev->functionality =
@@ -146,13 +139,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
         dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
                 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
 
-        dev->base = ioremap(mem->start, resource_size(mem));
-        if (dev->base == NULL) {
-                dev_err(&pdev->dev, "failure mapping io resources\n");
-                r = -EBUSY;
-                goto err_unuse_clocks;
-        }
-
         /* Try first if we can configure the device from ACPI */
         r = dw_i2c_acpi_configure(pdev);
         if (r) {
@@ -164,13 +150,14 @@ static int dw_i2c_probe(struct platform_device *pdev)
         }
         r = i2c_dw_init(dev);
         if (r)
-                goto err_iounmap;
+                return r;
 
         i2c_dw_disable_int(dev);
-        r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev);
+        r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
+                        pdev->name, dev);
         if (r) {
                 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
-                goto err_iounmap;
+                return r;
         }
 
         adap = &dev->adapter;
@@ -187,57 +174,35 @@ static int dw_i2c_probe(struct platform_device *pdev)
         r = i2c_add_numbered_adapter(adap);
         if (r) {
                 dev_err(&pdev->dev, "failure adding adapter\n");
-                goto err_free_irq;
+                return r;
         }
         of_i2c_register_devices(adap);
         acpi_i2c_register_devices(adap);
 
+        /* Increase reference counter */
+        get_device(&pdev->dev);
+
         pm_runtime_set_active(&pdev->dev);
         pm_runtime_enable(&pdev->dev);
         pm_runtime_put(&pdev->dev);
 
         return 0;
-
-err_free_irq:
-        free_irq(dev->irq, dev);
-err_iounmap:
-        iounmap(dev->base);
-err_unuse_clocks:
-        clk_disable_unprepare(dev->clk);
-        clk_put(dev->clk);
-        dev->clk = NULL;
-err_free_mem:
-        put_device(&pdev->dev);
-        kfree(dev);
-err_release_region:
-        release_mem_region(mem->start, resource_size(mem));
-
-        return r;
 }
 
 static int dw_i2c_remove(struct platform_device *pdev)
 {
         struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
-        struct resource *mem;
 
         pm_runtime_get_sync(&pdev->dev);
 
         i2c_del_adapter(&dev->adapter);
         put_device(&pdev->dev);
 
-        clk_disable_unprepare(dev->clk);
-        clk_put(dev->clk);
-        dev->clk = NULL;
-
         i2c_dw_disable(dev);
-        free_irq(dev->irq, dev);
-        kfree(dev);
 
         pm_runtime_put(&pdev->dev);
         pm_runtime_disable(&pdev->dev);
 
-        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        release_mem_region(mem->start, resource_size(mem));
         return 0;
 }