drivers/usb/chipidea/ci_hdrc_usb2.c

Source file repositories/reference/linux-study-clean/drivers/usb/chipidea/ci_hdrc_usb2.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/chipidea/ci_hdrc_usb2.c
Extension
.c
Size
3197 bytes
Lines
130
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ci_hdrc_usb2_priv {
	struct platform_device	*ci_pdev;
	struct clk		*clk;
};

static const struct ci_hdrc_platform_data ci_default_pdata = {
	.capoffset	= DEF_CAPOFFSET,
	.flags		= CI_HDRC_DISABLE_STREAMING,
};

static const struct ci_hdrc_platform_data ci_zynq_pdata = {
	.capoffset	= DEF_CAPOFFSET,
	.flags          = CI_HDRC_PHY_VBUS_CONTROL,
};

static const struct ci_hdrc_platform_data ci_zevio_pdata = {
	.capoffset	= DEF_CAPOFFSET,
	.flags		= CI_HDRC_REGS_SHARED | CI_HDRC_FORCE_FULLSPEED,
};

static const struct of_device_id ci_hdrc_usb2_of_match[] = {
	{ .compatible = "chipidea,usb2" },
	{ .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata },
	{ .compatible = "lsi,zevio-usb", .data = &ci_zevio_pdata },
	{ }
};
MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);

static int ci_hdrc_usb2_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ci_hdrc_usb2_priv *priv;
	struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
	const struct ci_hdrc_platform_data *data;
	int ret;

	if (!ci_pdata) {
		ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
		if (!ci_pdata)
			return -ENOMEM;
		*ci_pdata = ci_default_pdata;	/* struct copy */
	}

	data = device_get_match_data(&pdev->dev);
	if (data)
		/* struct copy */
		*ci_pdata = *data;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->clk = devm_clk_get_optional(dev, NULL);
	if (IS_ERR(priv->clk))
		return PTR_ERR(priv->clk);

	ret = clk_prepare_enable(priv->clk);
	if (ret) {
		dev_err(dev, "failed to enable the clock: %d\n", ret);
		return ret;
	}

	ci_pdata->name = dev_name(dev);

	priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
					   pdev->num_resources, ci_pdata);
	if (IS_ERR(priv->ci_pdev)) {
		ret = PTR_ERR(priv->ci_pdev);
		if (ret != -EPROBE_DEFER)
			dev_err(dev,
				"failed to register ci_hdrc platform device: %d\n",
				ret);
		goto clk_err;
	}

	platform_set_drvdata(pdev, priv);

	pm_runtime_no_callbacks(dev);
	pm_runtime_enable(dev);

	return 0;

clk_err:
	clk_disable_unprepare(priv->clk);
	return ret;
}

static void ci_hdrc_usb2_remove(struct platform_device *pdev)
{
	struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);

Annotation

Implementation Notes