C++ device_for_each_child函数代码示例

static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
					enum pci_channel_state error)
{
	struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};

	/* get true return value from &data */
	device_for_each_child(&dev->dev, &data, error_detected_iter);
	return data.result;
}

void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
			void (*choose_irq)(struct parisc_device *, void *))
{
	struct gsc_fixup_struct data = {
		.choose_irq	= choose_irq,
		.ctrl		= ctrl,
	};

	device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
}

static int camera_auto_detect(void)
{
	struct i2c_adapter *adap = i2c_get_adapter(2);

	pr_info("%s ++ %04x - %04x - %04x\n",
		__func__, ad5816_devid, dw9718_devid, max77387_devid);

	if ((ad5816_devid & 0xff00) == 0x2400) {
		if ((max77387_devid & 0xff) == 0x91) {
			/* IMX135 found */
			i2c_new_device(adap, &pluto_i2c_board_info_imx135);
		} else {
			/* IMX091 found*/
			i2c_new_device(adap, &pluto_i2c_board_info_imx091);
		}
	} else if (dw9718_devid) {
		if (!max77387_devid) {
			/* board e1823, IMX135 found */
			i2c_new_device(adap, &pluto_i2c_board_info_imx135);
			/* remove current dw9718 */
			device_for_each_child(&adap->dev,
				&pluto_i2c_board_info_dw9718.addr,
				pluto_chk_conflict);
			/* reinstall with new device node */
			pluto_dw9718_pdata.num = 0;
			i2c_new_device(adap, &pluto_i2c_board_info_dw9718);
		} else {
			/* AR0833 found */
			i2c_new_device(adap, &pluto_i2c_board_info_ar0833);
		}
	} else { /* default using ov5693 + ad5823 */
		device_for_each_child(&adap->dev,
			&pluto_i2c_board_info_ad5823.addr,
			pluto_chk_conflict);
		i2c_new_device(adap, &pluto_i2c_board_info_ov5693);
		i2c_new_device(adap, &pluto_i2c_board_info_ad5823);
	}
	i2c_new_device(adap, &pluto_i2c_board_info_imx132);

	pr_info("%s --\n", __func__);
	return 0;
}

static int smsc_hub_disable(struct hsic_hub *hub)
{
	struct smsc_hub_platform_data *pdata = hub->pdata;

	pm_runtime_forbid(hub->dev);
	device_for_each_child(hub->dev, NULL, sms_hub_remove_child);
	gpio_direction_output(pdata->hub_reset, 0);
	gpio_direction_output(pdata->xo_clk_gpio, 0);

	return 0;
}

static int kdwc3_remove(struct platform_device *pdev)
{
	struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);

	kdwc3_disable_irqs(kdwc);
	device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
	clk_disable_unprepare(kdwc->clk);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
					enum pci_channel_state error)
{
	struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
	int ret;

	/* can not fail */
	ret = device_for_each_child(&dev->dev, &data, error_detected_iter);

	return data.result;
}

static int dwc3_exynos_remove(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);

	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);

	clk_disable_unprepare(exynos->clk);

	return 0;
}

static int dwc3_omap_remove(struct platform_device *pdev)
{
	struct dwc3_omap	*omap = platform_get_drvdata(pdev);

	platform_device_unregister(omap->usb2_phy);
	platform_device_unregister(omap->usb3_phy);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
	device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);

	return 0;
}

int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
{
	int count = 0;
	/* Flush any possible dimm registration failures */
	nd_synchronize();

	device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
	dev_dbg(&nvdimm_bus->dev, "%s: count: %d\n", __func__, count);
	if (count != dimm_count)
		return -ENXIO;
	return 0;
}

/**
 * nd_is_uuid_unique - verify that no other namespace has @uuid
 * @dev: any device on a nvdimm_bus
 * @uuid: uuid to check
 */
bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return false;
	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
	if (device_for_each_child(&nvdimm_bus->dev, uuid,
				is_namespace_uuid_busy) != 0)
		return false;
	return true;
}

static int omap_ocp2scp_probe(struct platform_device *pdev)
{
	int ret;
	u32 reg;
	void __iomem *regs;
	struct resource *res;
	struct device_node *np = pdev->dev.of_node;

	if (np) {
		ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
		if (ret) {
			dev_err(&pdev->dev,
			    "failed to add resources for ocp2scp child\n");
			goto err0;
		}
	}

	pm_runtime_enable(&pdev->dev);
	/*
	 * As per AM572x TRM: http://www.ti.com/lit/ug/spruhz6/spruhz6.pdf
	 * under section 26.3.2.2, table 26-26 OCP2SCP TIMING Caution;
	 * As per OMAP4430 TRM: http://www.ti.com/lit/ug/swpu231ap/swpu231ap.pdf
	 * under section 23.12.6.2.2 , Table 23-1213 OCP2SCP TIMING Caution;
	 * As per OMAP4460 TRM: http://www.ti.com/lit/ug/swpu235ab/swpu235ab.pdf
	 * under section 23.12.6.2.2, Table 23-1213 OCP2SCP TIMING Caution;
	 * As per OMAP543x TRM http://www.ti.com/lit/pdf/swpu249
	 * under section 27.3.2.2, Table 27-27 OCP2SCP TIMING Caution;
	 *
	 * Read path of OCP2SCP is not working properly due to low reset value
	 * of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6 or more.
	 */
	if (!of_device_is_compatible(np, "ti,am437x-ocp2scp")) {
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		regs = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(regs))
			goto err0;

		pm_runtime_get_sync(&pdev->dev);
		reg = readl_relaxed(regs + OCP2SCP_TIMING);
		reg &= ~(SYNC2_MASK);
		reg |= 0x6;
		writel_relaxed(reg, regs + OCP2SCP_TIMING);
		pm_runtime_put_sync(&pdev->dev);
	}

	return 0;

err0:
	device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);

	return ret;
}

static void umc_bus_rescan(struct device *parent)
{
	int err;

	/*
	 * We can't use bus_rescan_devices() here as it deadlocks when
	 * it tries to retake the dev->parent semaphore.
	 */
	err = device_for_each_child(parent, NULL, umc_bus_rescan_helper);
	if (err < 0)
		printk(KERN_WARNING "%s: rescan of bus failed: %d\n",
		       KBUILD_MODNAME, err);
}

static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
{
	pci_ers_result_t status;

	/* If fatal, restore cfg space for possible link reset at upstream */
	if (dev->error_state == pci_channel_io_frozen) {
		pcie_portdrv_restore_config(dev);
		pci_enable_pcie_error_reporting(dev);
	}

	device_for_each_child(&dev->dev, &status, slot_reset_iter);

	return status;
}

static int __exit omapdss_hdmihw_remove(struct platform_device *pdev)
{
	device_for_each_child(&pdev->dev, NULL, hdmi_remove_child);

	dss_unregister_child_devices(&pdev->dev);

	hdmi_panel_exit();

	hdmi_uninit_output(pdev);

	pm_runtime_disable(&pdev->dev);

	return 0;
}

static int arche_platform_remove(struct platform_device *pdev)
{
	struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);

	unregister_pm_notifier(&arche_pdata->pm_notifier);
	device_remove_file(&pdev->dev, &dev_attr_state);
	device_for_each_child(&pdev->dev, NULL, arche_remove_child);
	arche_platform_poweroff_seq(arche_pdata);

	if (usb3613_hub_mode_ctrl(false))
		dev_warn(arche_pdata->dev, "failed to control hub device\n");
		/* TODO: Should we do anything more here ?? */
	return 0;
}