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/slab.h> 10#include <linux/uwb/umc.h> 11 12static 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 */ 27struct 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) { 33 dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n); 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} 42EXPORT_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 */ 51int umc_device_register(struct umc_dev *umc) 52{ 53 int err; 54 55 err = request_resource(umc->resource.parent, &umc->resource); 56 if (err < 0) { 57 dev_err(&umc->dev, "can't allocate resource range %pR: %d\n", 58 &umc->resource, err); 59 goto error_request_resource; 60 } 61 62 err = device_register(&umc->dev); 63 if (err < 0) 64 goto error_device_register; 65 return 0; 66 67error_device_register: 68 release_resource(&umc->resource); 69error_request_resource: 70 return err; 71} 72EXPORT_SYMBOL_GPL(umc_device_register); 73 74/** 75 * umc_device_unregister - unregister a UMC device 76 * @umc: pointer to the UMC device 77 * 78 * First we unregister the device, make sure the driver can do it's 79 * resource release thing and then we try to release any left over 80 * resources. We take a ref to the device, to make sure it doesn't 81 * dissapear under our feet. 82 */ 83void umc_device_unregister(struct umc_dev *umc) 84{ 85 struct device *dev; 86 if (!umc) 87 return; 88 dev = get_device(&umc->dev); 89 device_unregister(&umc->dev); 90 release_resource(&umc->resource); 91 put_device(dev); 92} 93EXPORT_SYMBOL_GPL(umc_device_unregister); 94