C++ device_initialize函数代码示例

/*
 * Allocate and initialise a new MMC card structure.
 */
struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
{
	struct mmc_card *card;

	card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
	if (!card)
		return ERR_PTR(-ENOMEM);

	card->host = host;

	device_initialize(&card->dev);

	card->dev.parent = mmc_classdev(host);
	card->dev.bus = &mmc_bus_type;
	card->dev.release = mmc_release_card;
	card->dev.type = type;

	spin_lock_init(&card->wr_pack_stats.lock);

	return card;
}

stm_display_device_t *stm_display_get_device(unsigned id)
{
  if(id>=maxDevices)
    return 0;

  if(theDevices[id].public_dev.lock == 0)
  {
    if(device_initialize(id) < 0)
      return 0;
  }
  else
  {
    if(g_pIOS->DownSemaphore(theDevices[id].public_dev.lock) != 0)
      return 0;
  }

  theDevices[id].use_count++;

  g_pIOS->UpSemaphore(theDevices[id].public_dev.lock);

  return &theDevices[id].public_dev;
}

/*
 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
 */
int __init edac_mc_sysfs_init(void)
{
	struct bus_type *edac_subsys;
	int err;

	/* get the /sys/devices/system/edac subsys reference */
	edac_subsys = edac_get_sysfs_subsys();
	if (edac_subsys == NULL) {
		edac_dbg(1, "no edac_subsys\n");
		err = -EINVAL;
		goto out;
	}

	mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
	if (!mci_pdev) {
		err = -ENOMEM;
		goto out_put_sysfs;
	}

	mci_pdev->bus = edac_subsys;
	mci_pdev->type = &mc_attr_type;
	device_initialize(mci_pdev);
	dev_set_name(mci_pdev, "mc");

	err = device_add(mci_pdev);
	if (err < 0)
		goto out_dev_free;

	edac_dbg(0, "device %s created\n", dev_name(mci_pdev));

	return 0;

 out_dev_free:
	kfree(mci_pdev);
 out_put_sysfs:
	edac_put_sysfs_subsys();
 out:
	return err;
}

static struct device *__nd_pfn_create(struct nd_region *nd_region,
		u8 *uuid, enum nd_pfn_mode mode,
		struct nd_namespace_common *ndns)
{
	struct nd_pfn *nd_pfn;
	struct device *dev;

	/* we can only create pages for contiguous ranged of pmem */
	if (!is_nd_pmem(&nd_region->dev))
		return NULL;

	nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
	if (!nd_pfn)
		return NULL;

	nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
	if (nd_pfn->id < 0) {
		kfree(nd_pfn);
		return NULL;
	}

	nd_pfn->mode = mode;
	if (uuid)
		uuid = kmemdup(uuid, 16, GFP_KERNEL);
	nd_pfn->uuid = uuid;
	dev = &nd_pfn->dev;
	dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
	dev->parent = &nd_region->dev;
	dev->type = &nd_pfn_device_type;
	dev->groups = nd_pfn_attribute_groups;
	device_initialize(&nd_pfn->dev);
	if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
		dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
				__func__, dev_name(ndns->claim));
		put_device(dev);
		return NULL;
	}
	return dev;
}

struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr)
{
	struct mdio_device *mdiodev;

	/* We allocate the device, and initialize the default values */
	mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL);
	if (!mdiodev)
		return ERR_PTR(-ENOMEM);

	mdiodev->dev.release = mdio_device_release;
	mdiodev->dev.parent = &bus->dev;
	mdiodev->dev.bus = &mdio_bus_type;
	mdiodev->device_free = mdio_device_free;
	mdiodev->device_remove = mdio_device_remove;
	mdiodev->bus = bus;
	mdiodev->addr = addr;

	dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);

	device_initialize(&mdiodev->dev);

	return mdiodev;
}

/*
 * Allocate and initialise a new MMC card structure.
 */
struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
{
	struct mmc_card *card;
	DBG("[%s] s\n",__func__);
	
	card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
	if (!card) {
		DBG("[%s] e1\n",__func__);
		return ERR_PTR(-ENOMEM);
	}

	card->host = host;

	device_initialize(&card->dev);

	card->dev.parent = mmc_classdev(host);
	card->dev.bus = &mmc_bus_type;
	card->dev.release = mmc_release_card;
	card->dev.type = type;

	DBG("[%s] e2\n",__func__);
	return card;
}

/**
 * spmi_alloc_device: Allocate a new SPMI devices.
 * @ctrl: controller to which this device is to be added to.
 * Context: can sleep
 *
 * Allows a driver to allocate and initialize a SPMI device without
 * registering it immediately.  This allows a driver to directly fill
 * the spmi_device structure before calling spmi_add_device().
 *
 * Caller is responsible to call spmi_add_device() on the returned
 * spmi_device.  If the caller needs to discard the spmi_device without
 * adding it, then spmi_dev_put() should be called.
 */
struct spmi_device *spmi_alloc_device(struct spmi_controller *ctrl)
{
	struct spmi_device *spmidev;

	if (!ctrl || !spmi_busnum_to_ctrl(ctrl->nr)) {
		pr_err("Missing SPMI controller\n");
		return NULL;
	}

	spmidev = kzalloc(sizeof(*spmidev), GFP_KERNEL);
	if (!spmidev) {
		dev_err(&ctrl->dev, "unable to allocate spmi_device\n");
		return NULL;
	}

	spmidev->ctrl = ctrl;
	spmidev->dev.parent = ctrl->dev.parent;
	spmidev->dev.bus = &spmi_bus_type;
	spmidev->dev.type = &spmi_dev_type;
	device_initialize(&spmidev->dev);

	return spmidev;
}

static struct device *
snd_create_device(struct device *parent,
		  struct device_driver *driver,
		  const char *name)
{
	struct device *device;
	int ret;

	device = devm_kzalloc(parent, sizeof(*device), GFP_KERNEL);
	if (!device)
		return ERR_PTR(-ENOMEM);

	device_initialize(device);
	device->parent = parent;
	device->driver = driver;

	dev_set_name(device, "%s", name);

	ret = snd_devm_add_child(parent, device);
	if (ret)
		return ERR_PTR(ret);

	return device;
}

int device_demo_register(struct device_demo* pdev)
{
	if(!pdev)
		return -1;

	device_initialize(&pdev->dev);

	if(!pdev->dev.parent)
		pdev->dev.parent = get_bus_demo_dev();

	if(strlen(pdev->dev.bus_id) <= 0)
		strncpy(pdev->dev.bus_id,pdev->name,BUS_ID_SIZE);
	pdev->dev.bus = get_bus_demo();

	int ret = 0;

	ret = device_add(&pdev->dev);
	if(ret)
	{
		printk("[Error]=[%s:%s:%d]=call fun device_add failed.\n",__FILE__,__func__,__LINE__);
		return -1;
	}
	return 0;
}

/**
 * rmi_register_transport_device - register a transport device connection
 * on the RMI bus.  Transport drivers provide communication from the devices
 * on a bus (such as SPI, I2C, and so on) to the RMI4 sensor.
 *
 * @xport: the transport device to register
 */
int rmi_register_transport_device(struct rmi_transport_dev *xport)
{
	static atomic_t transport_device_count = ATOMIC_INIT(0);
	struct rmi_device *rmi_dev;
	int error;

	rmi_dev = kzalloc(sizeof(struct rmi_device), GFP_KERNEL);
	if (!rmi_dev)
		return -ENOMEM;

	device_initialize(&rmi_dev->dev);

	rmi_dev->xport = xport;
	rmi_dev->number = atomic_inc_return(&transport_device_count) - 1;

	dev_set_name(&rmi_dev->dev, "rmi4-%02d", rmi_dev->number);

	rmi_dev->dev.bus = &rmi_bus_type;
	rmi_dev->dev.type = &rmi_device_type;

	xport->rmi_dev = rmi_dev;

	error = device_add(&rmi_dev->dev);
	if (error)
		goto err_put_device;

	rmi_dbg(RMI_DEBUG_CORE, xport->dev,
		"%s: Registered %s as %s.\n", __func__,
		dev_name(rmi_dev->xport->dev), dev_name(&rmi_dev->dev));

	return 0;

err_put_device:
	put_device(&rmi_dev->dev);
	return error;
}

/**
 * mcb_alloc_bus() - Allocate a new @mcb_bus
 *
 * Allocate a new @mcb_bus.
 */
struct mcb_bus *mcb_alloc_bus(struct device *carrier)
{
	struct mcb_bus *bus;
	int bus_nr;
	int rc;

	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
	if (!bus)
		return ERR_PTR(-ENOMEM);

	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
	if (bus_nr < 0) {
		rc = bus_nr;
		goto err_free;
	}

	bus->bus_nr = bus_nr;
	bus->carrier = get_device(carrier);

	device_initialize(&bus->dev);
	bus->dev.parent = carrier;
	bus->dev.bus = &mcb_bus_type;
	bus->dev.type = &mcb_carrier_device_type;
	bus->dev.release = &mcb_free_bus;

	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
	rc = device_add(&bus->dev);
	if (rc)
		goto err_free;

	return bus;
err_free:
	put_device(carrier);
	kfree(bus);
	return ERR_PTR(rc);
}

/**
 *	amba_device_register - register an AMBA device
 *	@dev: AMBA device to register
 *	@parent: parent memory resource
 *
 *	Setup the AMBA device, reading the cell ID if present.
 *	Claim the resource, and register the AMBA device with
 *	the Linux device manager.
 */
int amba_device_register(struct amba_device *dev, struct resource *parent)
{
	u32 size;
	void __iomem *tmp;
	int i, ret;

	device_initialize(&dev->dev);

	/*
	 * Copy from device_add
	 */
	if (dev->dev.init_name) {
		dev_set_name(&dev->dev, "%s", dev->dev.init_name);
		dev->dev.init_name = NULL;
	}

	dev->dev.release = amba_device_release;
	dev->dev.bus = &amba_bustype;
	dev->dev.dma_mask = &dev->dma_mask;
	dev->res.name = dev_name(&dev->dev);

	if (!dev->dev.coherent_dma_mask && dev->dma_mask)
		dev_warn(&dev->dev, "coherent dma mask is unset\n");

	ret = request_resource(parent, &dev->res);
	if (ret)
		goto err_out;

	/*
	 * Dynamically calculate the size of the resource
	 * and use this for iomap
	 */
	size = resource_size(&dev->res);
	tmp = ioremap(dev->res.start, size);
	if (!tmp) {
		ret = -ENOMEM;
		goto err_release;
	}

	ret = amba_get_enable_pclk(dev);
	if (ret == 0) {
		u32 pid, cid;

		/*
		 * Read pid and cid based on size of resource
		 * they are located at end of region
		 */
		for (pid = 0, i = 0; i < 4; i++)
			pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
				(i * 8);
		for (cid = 0, i = 0; i < 4; i++)
			cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
				(i * 8);

		amba_put_disable_pclk(dev);

		if (cid == AMBA_CID)
			dev->periphid = pid;

		if (!dev->periphid)
			ret = -ENODEV;
	}

	iounmap(tmp);

	if (ret)
		goto err_release;

	ret = device_add(&dev->dev);
	if (ret)
		goto err_release;

	if (dev->irq[0] != NO_IRQ)
		ret = device_create_file(&dev->dev, &dev_attr_irq0);
	if (ret == 0 && dev->irq[1] != NO_IRQ)
		ret = device_create_file(&dev->dev, &dev_attr_irq1);
	if (ret == 0)
		return ret;

	device_unregister(&dev->dev);

 err_release:
	release_resource(&dev->res);
 err_out:
	return ret;
}

int device_register(struct device *dev)
{
	device_initialize(dev);
	return device_add(dev);
}

/*
 * 	probe - binds to the platform device
 */
static int s3c_udc_probe(struct platform_device *pdev)
{
	struct s3c_udc *dev = &memory;
	int retval;

	DEBUG("%s: %p\n", __func__, pdev);

#if 0// !NO_USING_USB_SWITCH 
	retval = i2c_add_driver(&fsa9480_i2c_driver);
	if (retval != 0)
		DEBUG_ERROR("[USB Switch] can't add i2c driver");
#endif

	spin_lock_init(&dev->lock);
	dev->dev = pdev;

	device_initialize(&dev->gadget.dev);
	dev->gadget.dev.parent = &pdev->dev;

	dev->gadget.is_dualspeed = 1;	// Hack only
	dev->gadget.is_otg = 0;
	dev->gadget.is_a_peripheral = 0;
	dev->gadget.b_hnp_enable = 0;
	dev->gadget.a_hnp_support = 0;
	dev->gadget.a_alt_hnp_support = 0;
	dev->udc_state = USB_STATE_NOTATTACHED;
	dev->config_gadget_driver = NO_GADGET_DRIVER;
	dev->clocked = 0;
	dev->powered = 0;
	
	the_controller = dev;
	platform_set_drvdata(pdev, dev);

	otg_clock = clk_get(&pdev->dev, "otg");

	if (IS_ERR(otg_clock)) {
		DEBUG_ERROR(KERN_INFO "failed to find otg clock source\n");
		return -ENOENT;
	}

#ifndef CONFIG_PM
	clk_enable(otg_clock);
#endif

	s3c_ep_list_reinit(dev);

	local_irq_disable();

	/* irq setup after old hardware state is cleaned up */
	retval =  request_irq(IRQ_OTG, s3c_udc_irq, 0, driver_name, dev);

	if (retval != 0) {
		DEBUG(KERN_ERR "%s: can't get irq %i, err %d\n", driver_name,
		      IRQ_OTG, retval);
		return -EBUSY;
	}

	disable_irq(IRQ_OTG);
	local_irq_enable();
	create_proc_files();

	//it just prints which file included regarding whether DMA mode or SLAVE mode
	s3c_show_mode();

	
#if TESTING_SOFT_CONNCTION
	soft_switch.name = SOFT_SWITCH_NAME;
	soft_switch.print_name = soft_switch_name;
	soft_switch.print_state = soft_switch_state;
	soft_switch.state = 0;
	if (switch_dev_register(&soft_switch) < 0)
		switch_dev_unregister(&soft_switch);
#endif

	return retval;
}

/**
 * usb_alloc_dev - usb device constructor (usbcore-internal)
 * @parent: hub to which device is connected; null to allocate a root hub
 * @bus: bus used to access the device
 * @port1: one-based index of port; ignored for root hubs
 * Context: !in_interrupt()
 *
 * Only hub drivers (including virtual root hub drivers for host
 * controllers) should ever call this.
 *
 * This call may not be used in a non-sleeping context.
 */
struct usb_device *usb_alloc_dev(struct usb_device *parent,
				 struct usb_bus *bus, unsigned port1)
{
	struct usb_device *dev;
	struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self);
	unsigned root_hub = 0;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	if (!usb_get_hcd(bus_to_hcd(bus))) {
		kfree(dev);
		return NULL;
	}

	device_initialize(&dev->dev);
	dev->dev.bus = &usb_bus_type;
	dev->dev.type = &usb_device_type;
	dev->dev.groups = usb_device_groups;
	dev->dev.dma_mask = bus->controller->dma_mask;
	set_dev_node(&dev->dev, dev_to_node(bus->controller));
	dev->state = USB_STATE_ATTACHED;
	atomic_set(&dev->urbnum, 0);

	INIT_LIST_HEAD(&dev->ep0.urb_list);
	dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
	dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
	/* ep0 maxpacket comes later, from device descriptor */
	usb_enable_endpoint(dev, &dev->ep0, true);
	dev->can_submit = 1;

	/* Save readable and stable topology id, distinguishing devices
	 * by location for diagnostics, tools, driver model, etc.  The
	 * string is a path along hub ports, from the root.  Each device's
	 * dev->devpath will be stable until USB is re-cabled, and hubs
	 * are often labeled with these port numbers.  The name isn't
	 * as stable:  bus->busnum changes easily from modprobe order,
	 * cardbus or pci hotplugging, and so on.
	 */
	if (unlikely(!parent)) {
		dev->devpath[0] = '0';

		dev->dev.parent = bus->controller;
		dev_set_name(&dev->dev, "usb%d", bus->busnum);
		root_hub = 1;
	} else {
		/* match any labeling on the hubs; it's one-based */
		if (parent->devpath[0] == '0')
			snprintf(dev->devpath, sizeof dev->devpath,
				"%d", port1);
		else
			snprintf(dev->devpath, sizeof dev->devpath,
				"%s.%d", parent->devpath, port1);

		dev->dev.parent = &parent->dev;
		dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);

		/* hub driver sets up TT records */
	}

	dev->portnum = port1;
	dev->bus = bus;
	dev->parent = parent;
	INIT_LIST_HEAD(&dev->filelist);

#ifdef	CONFIG_PM
	mutex_init(&dev->pm_mutex);
	INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work);
	dev->autosuspend_delay = usb_autosuspend_delay * HZ;
	dev->connect_time = jiffies;
	dev->active_duration = -jiffies;
#endif
	if (root_hub)	/* Root hub always ok [and always wired] */
		dev->authorized = 1;
	else {
		dev->authorized = usb_hcd->authorized_default;
		dev->wusb = usb_bus_is_wusb(bus)? 1 : 0;
	}
	return dev;
}