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Date: Tue, 28 Oct 2014 23:21:37 +0530
From: Pramod Gurav <pramod.gurav.etc@...il.com>
To: Pramod Gurav <pramod.gurav@...rtplayin.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-input@...r.kernel.org
Subject: Re: [PATCH] Input: nomadik-ske-keypad: Switch to using managed resources
Hi Dmitry,
Is this change okey?
On Wed, Oct 8, 2014 at 4:20 PM, Pramod Gurav
<pramod.gurav@...rtplayin.com> wrote:
> This change switches to using devm_* APIs to allocate resources.
> This helps to simplify failure path in probe function as well as
> remove function.
>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: linux-input@...r.kernel.org
> Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
> ---
> drivers/input/keyboard/nomadik-ske-keypad.c | 63 +++++++++------------------
> 1 file changed, 20 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/input/keyboard/nomadik-ske-keypad.c b/drivers/input/keyboard/nomadik-ske-keypad.c
> index 63332e2..95ac317 100644
> --- a/drivers/input/keyboard/nomadik-ske-keypad.c
> +++ b/drivers/input/keyboard/nomadik-ske-keypad.c
> @@ -247,12 +247,11 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
> + keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
> input = input_allocate_device();
> if (!keypad || !input) {
> dev_err(&pdev->dev, "failed to allocate keypad memory\n");
> - error = -ENOMEM;
> - goto err_free_mem;
> + return -ENOMEM;
> }
>
> keypad->irq = irq;
> @@ -260,31 +259,29 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> keypad->input = input;
> spin_lock_init(&keypad->ske_keypad_lock);
>
> - if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
> + if (!devm_request_mem_region(&pdev->dev, res->start,
> + resource_size(res), pdev->name)) {
> dev_err(&pdev->dev, "failed to request I/O memory\n");
> - error = -EBUSY;
> - goto err_free_mem;
> + return -EBUSY;
> }
>
> - keypad->reg_base = ioremap(res->start, resource_size(res));
> + keypad->reg_base = devm_ioremap(&pdev->dev, res->start,
> + resource_size(res));
> if (!keypad->reg_base) {
> dev_err(&pdev->dev, "failed to remap I/O memory\n");
> - error = -ENXIO;
> - goto err_free_mem_region;
> + return -ENXIO;
> }
>
> - keypad->pclk = clk_get(&pdev->dev, "apb_pclk");
> + keypad->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
> if (IS_ERR(keypad->pclk)) {
> dev_err(&pdev->dev, "failed to get pclk\n");
> - error = PTR_ERR(keypad->pclk);
> - goto err_iounmap;
> + return PTR_ERR(keypad->pclk);
> }
>
> - keypad->clk = clk_get(&pdev->dev, NULL);
> + keypad->clk = devm_clk_get(&pdev->dev, NULL);
> if (IS_ERR(keypad->clk)) {
> dev_err(&pdev->dev, "failed to get clk\n");
> - error = PTR_ERR(keypad->clk);
> - goto err_pclk;
> + return PTR_ERR(keypad->clk);
> }
>
> input->id.bustype = BUS_HOST;
> @@ -296,7 +293,7 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> keypad->keymap, input);
> if (error) {
> dev_err(&pdev->dev, "Failed to build keymap\n");
> - goto err_clk;
> + return error;
> }
>
> input_set_capability(input, EV_MSC, MSC_SCAN);
> @@ -306,7 +303,7 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> error = clk_prepare_enable(keypad->pclk);
> if (error) {
> dev_err(&pdev->dev, "Failed to prepare/enable pclk\n");
> - goto err_clk;
> + return error;
> }
>
> error = clk_prepare_enable(keypad->clk);
> @@ -326,8 +323,9 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> goto err_clk_disable;
> }
>
> - error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
> - IRQF_ONESHOT, "ske-keypad", keypad);
> + error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
> + ske_keypad_irq, IRQF_ONESHOT,
> + "ske-keypad", keypad);
> if (error) {
> dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
> goto err_clk_disable;
> @@ -337,7 +335,7 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
> if (error) {
> dev_err(&pdev->dev,
> "unable to register input device: %d\n", error);
> - goto err_free_irq;
> + goto err_clk_disable;
> }
>
> if (plat->wakeup_enable)
> @@ -347,45 +345,24 @@ static int __init ske_keypad_probe(struct platform_device *pdev)
>
> return 0;
>
> -err_free_irq:
> - free_irq(keypad->irq, keypad);
> err_clk_disable:
> clk_disable_unprepare(keypad->clk);
> err_pclk_disable:
> clk_disable_unprepare(keypad->pclk);
> -err_clk:
> - clk_put(keypad->clk);
> -err_pclk:
> - clk_put(keypad->pclk);
> -err_iounmap:
> - iounmap(keypad->reg_base);
> -err_free_mem_region:
> - release_mem_region(res->start, resource_size(res));
> -err_free_mem:
> - input_free_device(input);
> - kfree(keypad);
> +
> return error;
> }
>
> static int ske_keypad_remove(struct platform_device *pdev)
> {
> struct ske_keypad *keypad = platform_get_drvdata(pdev);
> - struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -
> - free_irq(keypad->irq, keypad);
> -
> - input_unregister_device(keypad->input);
>
> clk_disable_unprepare(keypad->clk);
> - clk_put(keypad->clk);
> + clk_disable_unprepare(keypad->pclk);
>
> if (keypad->board->exit)
> keypad->board->exit();
>
> - iounmap(keypad->reg_base);
> - release_mem_region(res->start, resource_size(res));
> - kfree(keypad);
> -
> return 0;
> }
>
> --
> 1.7.9.5
>
> --
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--
Thanks and Regards
Pramod
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