Input: samsung-keypad - switch to using managed resources

devm_* functions are device managed and make error handling and code
simpler. While at it also fix error exit paths.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 31 insertions, 72 deletions

diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
index acc161966c3e..22e357b51024 100644
--- a/drivers/input/keyboard/samsung-keypad.c
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -309,7 +309,7 @@ static void samsung_keypad_parse_dt_gpio(struct device *dev,
                                 struct samsung_keypad *keypad)
 {
         struct device_node *np = dev->of_node;
-        int gpio, ret, row, col;
+        int gpio, error, row, col;
 
         for (row = 0; row < keypad->rows; row++) {
                 gpio = of_get_named_gpio(np, "row-gpios", row);
@@ -320,10 +320,11 @@ static void samsung_keypad_parse_dt_gpio(struct device *dev,
                         continue;
                 }
 
-                ret = gpio_request(gpio, "keypad-row");
-                if (ret)
-                        dev_err(dev, "keypad row[%d] gpio request failed\n",
-                                        row);
+                error = devm_gpio_request(dev, gpio, "keypad-row");
+                if (error)
+                        dev_err(dev,
+                                "keypad row[%d] gpio request failed: %d\n",
+                                row, error);
         }
 
         for (col = 0; col < keypad->cols; col++) {
@@ -335,35 +336,19 @@ static void samsung_keypad_parse_dt_gpio(struct device *dev,
                         continue;
                 }
 
-                ret = gpio_request(gpio, "keypad-col");
-                if (ret)
-                        dev_err(dev, "keypad column[%d] gpio request failed\n",
-                                        col);
+                error = devm_gpio_request(dev, gpio, "keypad-col");
+                if (error)
+                        dev_err(dev,
+                                "keypad column[%d] gpio request failed: %d\n",
+                                col, error);
         }
 }
-
-static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
-{
-        int cnt;
-
-        for (cnt = 0; cnt < keypad->rows; cnt++)
-                if (gpio_is_valid(keypad->row_gpios[cnt]))
-                        gpio_free(keypad->row_gpios[cnt]);
-
-        for (cnt = 0; cnt < keypad->cols; cnt++)
-                if (gpio_is_valid(keypad->col_gpios[cnt]))
-                        gpio_free(keypad->col_gpios[cnt]);
-}
 #else
 static
 struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
 {
         return NULL;
 }
-
-static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
-{
-}
 #endif
 
 static int samsung_keypad_probe(struct platform_device *pdev)
@@ -405,36 +390,30 @@ static int samsung_keypad_probe(struct platform_device *pdev)
         row_shift = get_count_order(pdata->cols);
         keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
 
-        keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
-        input_dev = input_allocate_device();
-        if (!keypad || !input_dev) {
-                error = -ENOMEM;
-                goto err_free_mem;
-        }
+        keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
+                              GFP_KERNEL);
+        input_dev = devm_input_allocate_device(&pdev->dev);
+        if (!keypad || !input_dev)
+                return -ENOMEM;
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!res) {
-                error = -ENODEV;
-                goto err_free_mem;
-        }
+        if (!res)
+                return -ENODEV;
 
-        keypad->base = ioremap(res->start, resource_size(res));
-        if (!keypad->base) {
-                error = -EBUSY;
-                goto err_free_mem;
-        }
+        keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+        if (!keypad->base)
+                return -EBUSY;
 
-        keypad->clk = clk_get(&pdev->dev, "keypad");
+        keypad->clk = devm_clk_get(&pdev->dev, "keypad");
         if (IS_ERR(keypad->clk)) {
                 dev_err(&pdev->dev, "failed to get keypad clk\n");
-                error = PTR_ERR(keypad->clk);
-                goto err_unmap_base;
+                return PTR_ERR(keypad->clk);
         }
 
         error = clk_prepare(keypad->clk);
         if (error) {
                 dev_err(&pdev->dev, "keypad clock prepare failed\n");
-                goto err_put_clk;
+                return error;
         }
 
         keypad->input_dev = input_dev;
@@ -479,14 +458,15 @@ static int samsung_keypad_probe(struct platform_device *pdev)
         keypad->irq = platform_get_irq(pdev, 0);
         if (keypad->irq < 0) {
                 error = keypad->irq;
-                goto err_put_clk;
+                goto err_unprepare_clk;
         }
 
-        error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
-                        IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
+        error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
+                                          samsung_keypad_irq, IRQF_ONESHOT,
+                                          dev_name(&pdev->dev), keypad);
         if (error) {
                 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
-                goto err_put_clk;
+                goto err_unprepare_clk;
         }
 
         device_init_wakeup(&pdev->dev, pdata->wakeup);
@@ -495,7 +475,7 @@ static int samsung_keypad_probe(struct platform_device *pdev)
 
         error = input_register_device(keypad->input_dev);
         if (error)
-                goto err_free_irq;
+                goto err_disable_runtime_pm;
 
         if (pdev->dev.of_node) {
                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
@@ -504,22 +484,12 @@ static int samsung_keypad_probe(struct platform_device *pdev)
         }
         return 0;
 
-err_free_irq:
-        free_irq(keypad->irq, keypad);
+err_disable_runtime_pm:
         pm_runtime_disable(&pdev->dev);
         device_init_wakeup(&pdev->dev, 0);
         platform_set_drvdata(pdev, NULL);
 err_unprepare_clk:
         clk_unprepare(keypad->clk);
-err_put_clk:
-        clk_put(keypad->clk);
-        samsung_keypad_dt_gpio_free(keypad);
-err_unmap_base:
-        iounmap(keypad->base);
-err_free_mem:
-        input_free_device(input_dev);
-        kfree(keypad);
-
         return error;
 }
 
@@ -533,18 +503,7 @@ static int samsung_keypad_remove(struct platform_device *pdev)
 
         input_unregister_device(keypad->input_dev);
 
-        /*
-         * It is safe to free IRQ after unregistering device because
-         * samsung_keypad_close will shut off interrupts.
-         */
-        free_irq(keypad->irq, keypad);
-
         clk_unprepare(keypad->clk);
-        clk_put(keypad->clk);
-        samsung_keypad_dt_gpio_free(keypad);
-
-        iounmap(keypad->base);
-        kfree(keypad);
 
         return 0;
 }