i2c: pca-platform: use device managed allocations

Switch to using the devm_ APIs and remove the now unnecessary error
handling and most of the device removal code.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
[wsa: adapted error handling I added in previous patch]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 12 insertions, 47 deletions

diff --git a/drivers/i2c/busses/i2c-pca-platform.c b/drivers/i2c/busses/i2c-pca-platform.c
index 31d7f76ddd94..7db481cbf402 100644
--- a/drivers/i2c/busses/i2c-pca-platform.c
+++ b/drivers/i2c/busses/i2c-pca-platform.c
@@ -143,35 +143,23 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
         int ret = 0;
         int irq;
 
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         irq = platform_get_irq(pdev, 0);
         /* If irq is 0, we do polling. */
         if (irq < 0)
                 irq = 0;
 
-        if (res == NULL) {
-                ret = -ENODEV;
-                goto e_print;
-        }
+        i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+        if (!i2c)
+                return -ENOMEM;
 
-        if (!request_mem_region(res->start, resource_size(res), res->name)) {
-                ret = -ENOMEM;
-                goto e_print;
-        }
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        i2c->reg_base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(i2c->reg_base))
+                return PTR_ERR(i2c->reg_base);
 
-        i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL);
-        if (!i2c) {
-                ret = -ENOMEM;
-                goto e_alloc;
-        }
 
         init_waitqueue_head(&i2c->wait);
 
-        i2c->reg_base = ioremap(res->start, resource_size(res));
-        if (!i2c->reg_base) {
-                ret = -ENOMEM;
-                goto e_remap;
-        }
         i2c->io_base = res->start;
         i2c->io_size = resource_size(res);
         i2c->irq = irq;
@@ -205,10 +193,8 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
         } else if (np) {
                 i2c->adap.timeout = HZ;
                 i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset-gpios", GPIOD_OUT_LOW);
-                if (IS_ERR(i2c->gpio)) {
-                        ret = PTR_ERR(i2c->gpio);
-                        goto e_reqirq;
-                }
+                if (IS_ERR(i2c->gpio))
+                        return PTR_ERR(i2c->gpio);
                 of_property_read_u32_index(np, "clock-frequency", 0,
                                            &i2c->algo_data.i2c_clock);
         } else {
@@ -238,15 +224,14 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
         }
 
         if (irq) {
-                ret = request_irq(irq, i2c_pca_pf_handler,
+                ret = devm_request_irq(&pdev->dev, irq, i2c_pca_pf_handler,
                         IRQF_TRIGGER_FALLING, pdev->name, i2c);
                 if (ret)
-                        goto e_reqirq;
+                        return ret;
         }
 
         if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) {
-                ret = -ENODEV;
-                goto e_adapt;
+                return -ENODEV;
         }
 
         platform_set_drvdata(pdev, i2c);
@@ -254,19 +239,6 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
         printk(KERN_INFO "%s registered.\n", i2c->adap.name);
 
         return 0;
-
-e_adapt:
-        if (irq)
-                free_irq(irq, i2c);
-e_reqirq:
-        iounmap(i2c->reg_base);
-e_remap:
-        kfree(i2c);
-e_alloc:
-        release_mem_region(res->start, resource_size(res));
-e_print:
-        printk(KERN_ERR "Registering PCA9564/PCA9665 FAILED! (%d)\n", ret);
-        return ret;
 }
 
 static int i2c_pca_pf_remove(struct platform_device *pdev)
@@ -275,13 +247,6 @@ static int i2c_pca_pf_remove(struct platform_device *pdev)
 
         i2c_del_adapter(&i2c->adap);
 
-        if (i2c->irq)
-                free_irq(i2c->irq, i2c);
-
-        iounmap(i2c->reg_base);
-        release_mem_region(i2c->io_base, i2c->io_size);
-        kfree(i2c);
-
         return 0;
 }