[linux-2.6-block.git] / drivers / uwb / umc-dev.c

/*
 * UWB Multi-interface Controller device management.
 *
 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
 *
 * This file is released under the GNU GPL v2.
 */
#include <linux/kernel.h>
#include <linux/uwb/umc.h>

static void umc_device_release(struct device *dev)
{
	struct umc_dev *umc = to_umc_dev(dev);

	kfree(umc);
}

/**
 * umc_device_create - allocate a child UMC device
 * @parent: parent of the new UMC device.
 * @n:      index of the new device.
 *
 * The new UMC device will have a bus ID of the parent with '-n'
 * appended.
 */
struct umc_dev *umc_device_create(struct device *parent, int n)
{
	struct umc_dev *umc;

	umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
	if (umc) {
		dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
		umc->dev.parent  = parent;
		umc->dev.bus     = &umc_bus_type;
		umc->dev.release = umc_device_release;

		umc->dev.dma_mask = parent->dma_mask;
	}
	return umc;
}
EXPORT_SYMBOL_GPL(umc_device_create);

/**
 * umc_device_register - register a UMC device
 * @umc: pointer to the UMC device
 *
 * The memory resource for the UMC device is acquired and the device
 * registered with the system.
 */
int umc_device_register(struct umc_dev *umc)
{
	int err;

	err = request_resource(umc->resource.parent, &umc->resource);
	if (err < 0) {
		dev_err(&umc->dev, "can't allocate resource range "
			"%016Lx to %016Lx: %d\n",
			(unsigned long long)umc->resource.start,
			(unsigned long long)umc->resource.end,
			err);
		goto error_request_resource;
	}

	err = device_register(&umc->dev);
	if (err < 0)
		goto error_device_register;
	return 0;

error_device_register:
	release_resource(&umc->resource);
error_request_resource:
	return err;
}
EXPORT_SYMBOL_GPL(umc_device_register);

/**
 * umc_device_unregister - unregister a UMC device
 * @umc: pointer to the UMC device
 *
 * First we unregister the device, make sure the driver can do it's
 * resource release thing and then we try to release any left over
 * resources. We take a ref to the device, to make sure it doesn't
 * dissapear under our feet.
 */
void umc_device_unregister(struct umc_dev *umc)
{
	struct device *dev;
	if (!umc)
		return;
	dev = get_device(&umc->dev);
	device_unregister(&umc->dev);
	release_resource(&umc->resource);
	put_device(dev);
}
EXPORT_SYMBOL_GPL(umc_device_unregister);
Commit	Line	Data
da389eac DV	1	/*
	2	* UWB Multi-interface Controller device management.
	3	*
	4	* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
	5	*
	6	* This file is released under the GNU GPL v2.
	7	*/
	8	#include <linux/kernel.h>
	9	#include <linux/uwb/umc.h>
da389eac DV	10
	11	static void umc_device_release(struct device *dev)
	12	{
	13	struct umc_dev *umc = to_umc_dev(dev);
	14
	15	kfree(umc);
	16	}
	17
	18	/**
	19	* umc_device_create - allocate a child UMC device
	20	* @parent: parent of the new UMC device.
	21	* @n: index of the new device.
	22	*
	23	* The new UMC device will have a bus ID of the parent with '-n'
	24	* appended.
	25	*/
	26	struct umc_dev umc_device_create(struct device parent, int n)
	27	{
	28	struct umc_dev *umc;
	29
	30	umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
	31	if (umc) {
ae9eba0e	32	dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
da389eac DV	33	umc->dev.parent = parent;
	34	umc->dev.bus = &umc_bus_type;
	35	umc->dev.release = umc_device_release;
	36
	37	umc->dev.dma_mask = parent->dma_mask;
	38	}
	39	return umc;
	40	}
	41	EXPORT_SYMBOL_GPL(umc_device_create);
	42
	43	/**
	44	* umc_device_register - register a UMC device
	45	* @umc: pointer to the UMC device
	46	*
	47	* The memory resource for the UMC device is acquired and the device
	48	* registered with the system.
	49	*/
	50	int umc_device_register(struct umc_dev *umc)
	51	{
	52	int err;
	53
da389eac DV	54	err = request_resource(umc->resource.parent, &umc->resource);
	55	if (err < 0) {
	56	dev_err(&umc->dev, "can't allocate resource range "
	57	"%016Lx to %016Lx: %d\n",
	58	(unsigned long long)umc->resource.start,
	59	(unsigned long long)umc->resource.end,
	60	err);
	61	goto error_request_resource;
	62	}
	63
	64	err = device_register(&umc->dev);
	65	if (err < 0)
	66	goto error_device_register;
da389eac DV	67	return 0;
	68
	69	error_device_register:
	70	release_resource(&umc->resource);
	71	error_request_resource:
da389eac DV	72	return err;
	73	}
	74	EXPORT_SYMBOL_GPL(umc_device_register);
	75
	76	/**
	77	* umc_device_unregister - unregister a UMC device
	78	* @umc: pointer to the UMC device
	79	*
	80	* First we unregister the device, make sure the driver can do it's
	81	* resource release thing and then we try to release any left over
	82	* resources. We take a ref to the device, to make sure it doesn't
	83	* dissapear under our feet.
	84	*/
	85	void umc_device_unregister(struct umc_dev *umc)
	86	{
	87	struct device *dev;
	88	if (!umc)
	89	return;
	90	dev = get_device(&umc->dev);
da389eac DV	91	device_unregister(&umc->dev);
da389eac DV	92	release_resource(&umc->resource);
da389eac DV	93	put_device(dev);
	94	}
	95	EXPORT_SYMBOL_GPL(umc_device_unregister);