[GitHub/mt8127/android_kernel_alcatel_ttab.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/slab.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>
5a0e3ad6	9	#include <linux/slab.h>
da389eac	10	#include <linux/uwb/umc.h>
da389eac DV	11
	12	static void umc_device_release(struct device *dev)
	13	{
	14	struct umc_dev *umc = to_umc_dev(dev);
	15
	16	kfree(umc);
	17	}
	18
	19	/**
	20	* umc_device_create - allocate a child UMC device
	21	* @parent: parent of the new UMC device.
	22	* @n: index of the new device.
	23	*
	24	* The new UMC device will have a bus ID of the parent with '-n'
	25	* appended.
	26	*/
	27	struct umc_dev umc_device_create(struct device parent, int n)
	28	{
	29	struct umc_dev *umc;
	30
	31	umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
	32	if (umc) {
ae9eba0e	33	dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
da389eac DV	34	umc->dev.parent = parent;
	35	umc->dev.bus = &umc_bus_type;
	36	umc->dev.release = umc_device_release;
	37
	38	umc->dev.dma_mask = parent->dma_mask;
	39	}
	40	return umc;
	41	}
	42	EXPORT_SYMBOL_GPL(umc_device_create);
	43
	44	/**
	45	* umc_device_register - register a UMC device
	46	* @umc: pointer to the UMC device
	47	*
	48	* The memory resource for the UMC device is acquired and the device
	49	* registered with the system.
	50	*/
	51	int umc_device_register(struct umc_dev *umc)
	52	{
	53	int err;
	54
da389eac DV	55	err = request_resource(umc->resource.parent, &umc->resource);
	56	if (err < 0) {
	57	dev_err(&umc->dev, "can't allocate resource range "
	58	"%016Lx to %016Lx: %d\n",
	59	(unsigned long long)umc->resource.start,
	60	(unsigned long long)umc->resource.end,
	61	err);
	62	goto error_request_resource;
	63	}
	64
	65	err = device_register(&umc->dev);
	66	if (err < 0)
	67	goto error_device_register;
da389eac DV	68	return 0;
	69
	70	error_device_register:
	71	release_resource(&umc->resource);
	72	error_request_resource:
da389eac DV	73	return err;
	74	}
	75	EXPORT_SYMBOL_GPL(umc_device_register);
	76
	77	/**
	78	* umc_device_unregister - unregister a UMC device
	79	* @umc: pointer to the UMC device
	80	*
	81	* First we unregister the device, make sure the driver can do it's
	82	* resource release thing and then we try to release any left over
	83	* resources. We take a ref to the device, to make sure it doesn't
	84	* dissapear under our feet.
	85	*/
	86	void umc_device_unregister(struct umc_dev *umc)
	87	{
	88	struct device *dev;
	89	if (!umc)
	90	return;
	91	dev = get_device(&umc->dev);
da389eac DV	92	device_unregister(&umc->dev);
da389eac DV	93	release_resource(&umc->resource);
da389eac DV	94	put_device(dev);
	95	}
	96	EXPORT_SYMBOL_GPL(umc_device_unregister);