i2c-designware-pci: use managed functions pcim_* and devm_*

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

diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index eed149d..aacb64e 100644 (file)
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -212,8 +212,6 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 {
        struct dw_i2c_dev *dev;
        struct i2c_adapter *adap;
-       unsigned long start, len;
-       void __iomem *base;
        int r;
        struct  dw_pci_controller *controller;
 
@@ -225,51 +223,30 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 
        controller = &dw_pci_controllers[id->driver_data];
 
-       r = pci_enable_device(pdev);
+       r = pcim_enable_device(pdev);
        if (r) {
                dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
                        r);
-               goto exit;
+               return r;
        }
 
-       /* Determine the address of the I2C area */
-       start = pci_resource_start(pdev, 0);
-       len = pci_resource_len(pdev, 0);
-       if (!start || len == 0) {
-               dev_err(&pdev->dev, "base address not set\n");
-               r = -ENODEV;
-               goto exit;
-       }
-
-       r = pci_request_region(pdev, 0, DRIVER_NAME);
+       r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
        if (r) {
-               dev_err(&pdev->dev, "failed to request I2C region "
-                       "0x%lx-0x%lx\n", start,
-                       (unsigned long)pci_resource_end(pdev, 0));
-               goto exit;
-       }
-
-       base = ioremap_nocache(start, len);
-       if (!base) {
                dev_err(&pdev->dev, "I/O memory remapping failed\n");
-               r = -ENOMEM;
-               goto err_release_region;
+               return r;
        }
 
-
-       dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
-       if (!dev) {
-               r = -ENOMEM;
-               goto err_release_region;
-       }
+       dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+       if (!dev)
+               return -ENOMEM;
 
        init_completion(&dev->cmd_complete);
        mutex_init(&dev->lock);
        dev->clk = NULL;
        dev->controller = controller;
        dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
-       dev->base = base;
-       dev->dev = get_device(&pdev->dev);
+       dev->base = pcim_iomap_table(pdev)[0];
+       dev->dev = &pdev->dev;
        dev->functionality =
                I2C_FUNC_I2C |
                I2C_FUNC_SMBUS_BYTE |
@@ -284,7 +261,7 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
        dev->rx_fifo_depth = controller->rx_fifo_depth;
        r = i2c_dw_init(dev);
        if (r)
-               goto err_iounmap;
+               return r;
 
        adap = &dev->adapter;
        i2c_set_adapdata(adap, dev);
@@ -296,10 +273,11 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
        snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
                adap->nr);
 
-       r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
+       r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
+                       adap->name, dev);
        if (r) {
                dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
-               goto err_iounmap;
+               return r;
        }
 
        i2c_dw_disable_int(dev);
@@ -307,24 +285,16 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
        r = i2c_add_numbered_adapter(adap);
        if (r) {
                dev_err(&pdev->dev, "failure adding adapter\n");
-               goto err_free_irq;
+               return r;
        }
 
+       /* Increase reference counter */
+       get_device(&pdev->dev);
+
        pm_runtime_put_noidle(&pdev->dev);
        pm_runtime_allow(&pdev->dev);
 
        return 0;
-
-err_free_irq:
-       free_irq(pdev->irq, dev);
-err_iounmap:
-       iounmap(dev->base);
-       put_device(&pdev->dev);
-       kfree(dev);
-err_release_region:
-       pci_release_region(pdev, 0);
-exit:
-       return r;
 }
 
 static void i2c_dw_pci_remove(struct pci_dev *pdev)
@@ -337,10 +307,6 @@ static void i2c_dw_pci_remove(struct pci_dev *pdev)
 
        i2c_del_adapter(&dev->adapter);
        put_device(&pdev->dev);
-
-       free_irq(dev->irq, dev);
-       kfree(dev);
-       pci_release_region(pdev, 0);
 }
 
 /* work with hotplug and coldplug */