linux-kernel - Re: [PATCH 2/2] input: misc: Add Spreadtrum vibrator driver

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Date:   Tue, 17 Apr 2018 09:25:30 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, orsonzhai@...il.com, zhang.lyra@...il.com,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, xiaotong.lu@...eadtrum.com
Subject: Re: [PATCH 2/2] input: misc: Add Spreadtrum vibrator driver

Hi Xiaotong,

On Tue, Apr 17, 2018 at 11:18:24AM +0800, Baolin Wang wrote:
> From: Xiaotong Lu <xiaotong.lu@...eadtrum.com>

[snip]

> +static int sc27xx_vibra_probe(struct platform_device *pdev)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	struct vibra_info *info;
> +	int ret;
> +
> +	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!info->regmap) {
> +		dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
> +		return -ENODEV;
> +	}
> +
> +	ret = of_property_read_u32(node, "reg", &info->base);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to get vibrator base address.\n");
> +		return ret;
> +	}
> +
> +	info->input_dev = devm_input_allocate_device(&pdev->dev);
> +	if (!info->input_dev) {
> +		dev_err(&pdev->dev, "failed to allocate input device.\n");
> +		return -ENOMEM;
> +	}
> +
> +	info->input_dev->name = "sc27xx:vibrator";
> +	info->input_dev->id.version = 0;
> +	info->input_dev->dev.parent = pdev->dev.parent;
> +	info->input_dev->close = sc27xx_vibra_close;
> +
> +	input_set_drvdata(info->input_dev, info);
> +	input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
> +	INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
> +	info->enabled = false;
> +
> +	ret = input_ff_create_memless(info->input_dev, NULL, sc27xx_vibra_play);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
> +		return ret;
> +	}
> +
> +	ret = input_register_device(info->input_dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register input device.\n");
> +		input_ff_destroy(info->input_dev);

I'm not sure how the input_ff is freed for managed devices.

Either you don't have to destroy it here, or you also need to destroy it
in a release() function.

> +		return ret;
> +	}
> +
> +	ret = sc27xx_vibra_hw_init(info);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
> +		input_ff_destroy(info->input_dev);
> +		input_unregister_device(info->input_dev);

No need to unregister managed input devices.

> +		return ret;
> +	}

Cheers,
Marcus Folkesson