static int tc6393xb_probe()

in tc6393xb.c [604:731]

• 104 lines of code
• 16 McCabe index (conditional complexity)

static int tc6393xb_probe(struct platform_device *dev)
{
	struct tc6393xb_platform_data *tcpd = dev_get_platdata(&dev->dev);
	struct tc6393xb *tc6393xb;
	struct resource *iomem, *rscr;
	int ret;

	iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!iomem)
		return -EINVAL;

	tc6393xb = kzalloc(sizeof *tc6393xb, GFP_KERNEL);
	if (!tc6393xb) {
		ret = -ENOMEM;
		goto err_kzalloc;
	}

	raw_spin_lock_init(&tc6393xb->lock);

	platform_set_drvdata(dev, tc6393xb);

	ret = platform_get_irq(dev, 0);
	if (ret >= 0)
		tc6393xb->irq = ret;
	else
		goto err_noirq;

	tc6393xb->iomem = iomem;
	tc6393xb->irq_base = tcpd->irq_base;

	tc6393xb->clk = clk_get(&dev->dev, "CLK_CK3P6MI");
	if (IS_ERR(tc6393xb->clk)) {
		ret = PTR_ERR(tc6393xb->clk);
		goto err_clk_get;
	}

	rscr = &tc6393xb->rscr;
	rscr->name = "tc6393xb-core";
	rscr->start = iomem->start;
	rscr->end = iomem->start + 0xff;
	rscr->flags = IORESOURCE_MEM;

	ret = request_resource(iomem, rscr);
	if (ret)
		goto err_request_scr;

	tc6393xb->scr = ioremap(rscr->start, resource_size(rscr));
	if (!tc6393xb->scr) {
		ret = -ENOMEM;
		goto err_ioremap;
	}

	ret = clk_prepare_enable(tc6393xb->clk);
	if (ret)
		goto err_clk_enable;

	ret = tcpd->enable(dev);
	if (ret)
		goto err_enable;

	iowrite8(0,				tc6393xb->scr + SCR_FER);
	iowrite16(tcpd->scr_pll2cr,		tc6393xb->scr + SCR_PLL2CR);
	iowrite16(SCR_CCR_UNK1 | SCR_CCR_HCLK_48,
						tc6393xb->scr + SCR_CCR);
	iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
		  SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
		  BIT(15),			tc6393xb->scr + SCR_MCR);
	iowrite16(tcpd->scr_gper,		tc6393xb->scr + SCR_GPER);
	iowrite8(0,				tc6393xb->scr + SCR_IRR);
	iowrite8(0xbf,				tc6393xb->scr + SCR_IMR);

	printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n",
			tmio_ioread8(tc6393xb->scr + SCR_REVID),
			(unsigned long) iomem->start, tc6393xb->irq);

	tc6393xb->gpio.base = -1;

	if (tcpd->gpio_base >= 0) {
		ret = tc6393xb_register_gpio(tc6393xb, tcpd->gpio_base);
		if (ret)
			goto err_gpio_add;
	}

	tc6393xb_attach_irq(dev);

	if (tcpd->setup) {
		ret = tcpd->setup(dev);
		if (ret)
			goto err_setup;
	}

	tc6393xb_cells[TC6393XB_CELL_NAND].platform_data = tcpd->nand_data;
	tc6393xb_cells[TC6393XB_CELL_NAND].pdata_size =
						sizeof(*tcpd->nand_data);
	tc6393xb_cells[TC6393XB_CELL_FB].platform_data = tcpd->fb_data;
	tc6393xb_cells[TC6393XB_CELL_FB].pdata_size = sizeof(*tcpd->fb_data);

	ret = mfd_add_devices(&dev->dev, dev->id,
			      tc6393xb_cells, ARRAY_SIZE(tc6393xb_cells),
			      iomem, tcpd->irq_base, NULL);

	if (!ret)
		return 0;

	if (tcpd->teardown)
		tcpd->teardown(dev);

err_setup:
	tc6393xb_detach_irq(dev);

err_gpio_add:
	if (tc6393xb->gpio.base != -1)
		gpiochip_remove(&tc6393xb->gpio);
	tcpd->disable(dev);
err_enable:
	clk_disable_unprepare(tc6393xb->clk);
err_clk_enable:
	iounmap(tc6393xb->scr);
err_ioremap:
	release_resource(&tc6393xb->rscr);
err_request_scr:
	clk_put(tc6393xb->clk);
err_noirq:
err_clk_get:
	kfree(tc6393xb);
err_kzalloc:
	return ret;
}