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 " 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; 68 return 0; 69 70error_device_register: 71 release_resource(&umc->resource); 72error_request_resource: 73 return err; 74} 75EXPORT_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 */ 86void umc_device_unregister(struct umc_dev *umc) 87{ 88 struct device *dev; 89 if (!umc) 90 return; 91 dev = get_device(&umc->dev); 92 device_unregister(&umc->dev); 93 release_resource(&umc->resource); 94 put_device(dev); 95} 96EXPORT_SYMBOL_GPL(umc_device_unregister); 97