static int rockchip_mbox_probe()

in rockchip-mailbox.c [164:247]

• 66 lines of code
• 13 McCabe index (conditional complexity)

static int rockchip_mbox_probe(struct platform_device *pdev)
{
	struct rockchip_mbox *mb;
	const struct of_device_id *match;
	const struct rockchip_mbox_data *drv_data;
	struct resource *res;
	int ret, irq, i;

	if (!pdev->dev.of_node)
		return -ENODEV;

	match = of_match_node(rockchip_mbox_of_match, pdev->dev.of_node);
	drv_data = (const struct rockchip_mbox_data *)match->data;

	mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
	if (!mb)
		return -ENOMEM;

	mb->chans = devm_kcalloc(&pdev->dev, drv_data->num_chans,
				 sizeof(*mb->chans), GFP_KERNEL);
	if (!mb->chans)
		return -ENOMEM;

	mb->mbox.chans = devm_kcalloc(&pdev->dev, drv_data->num_chans,
				      sizeof(*mb->mbox.chans), GFP_KERNEL);
	if (!mb->mbox.chans)
		return -ENOMEM;

	platform_set_drvdata(pdev, mb);

	mb->mbox.dev = &pdev->dev;
	mb->mbox.num_chans = drv_data->num_chans;
	mb->mbox.ops = &rockchip_mbox_chan_ops;
	mb->mbox.txdone_irq = true;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	mb->mbox_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(mb->mbox_base))
		return PTR_ERR(mb->mbox_base);

	/* Each channel has two buffers for A2B and B2A */
	mb->buf_size = (size_t)resource_size(res) / (drv_data->num_chans * 2);

	mb->pclk = devm_clk_get(&pdev->dev, "pclk_mailbox");
	if (IS_ERR(mb->pclk)) {
		ret = PTR_ERR(mb->pclk);
		dev_err(&pdev->dev, "failed to get pclk_mailbox clock: %d\n",
			ret);
		return ret;
	}

	ret = clk_prepare_enable(mb->pclk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable pclk: %d\n", ret);
		return ret;
	}

	for (i = 0; i < mb->mbox.num_chans; i++) {
		irq = platform_get_irq(pdev, i);
		if (irq < 0)
			return irq;

		ret = devm_request_threaded_irq(&pdev->dev, irq,
						rockchip_mbox_irq,
						rockchip_mbox_isr, IRQF_ONESHOT,
						dev_name(&pdev->dev), mb);
		if (ret < 0)
			return ret;

		mb->chans[i].idx = i;
		mb->chans[i].irq = irq;
		mb->chans[i].mb = mb;
		mb->chans[i].msg = NULL;
	}

	ret = devm_mbox_controller_register(&pdev->dev, &mb->mbox);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to register mailbox: %d\n", ret);

	return ret;
}