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/export.h> 10#include <linux/slab.h> 11#include <linux/uwb/umc.h> 12 13static void umc_device_release(struct device *dev) 14{ 15 struct umc_dev *umc = to_umc_dev(dev); 16 17 kfree(umc); 18} 19 20/** 21 * umc_device_create - allocate a child UMC device 22 * @parent: parent of the new UMC device. 23 * @n: index of the new device. 24 * 25 * The new UMC device will have a bus ID of the parent with '-n' 26 * appended. 27 */ 28struct umc_dev *umc_device_create(struct device *parent, int n) 29{ 30 struct umc_dev *umc; 31 32 umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL); 33 if (umc) { 34 dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n); 35 umc->dev.parent = parent; 36 umc->dev.bus = &umc_bus_type; 37 umc->dev.release = umc_device_release; 38 39 umc->dev.dma_mask = parent->dma_mask; 40 } 41 return umc; 42} 43EXPORT_SYMBOL_GPL(umc_device_create); 44 45/** 46 * umc_device_register - register a UMC device 47 * @umc: pointer to the UMC device 48 * 49 * The memory resource for the UMC device is acquired and the device 50 * registered with the system. 51 */ 52int umc_device_register(struct umc_dev *umc) 53{ 54 int err; 55 56 err = request_resource(umc->resource.parent, &umc->resource); 57 if (err < 0) { 58 dev_err(&umc->dev, "can't allocate resource range %pR: %d\n", 59 &umc->resource, err); 60 goto error_request_resource; 61 } 62 63 err = device_register(&umc->dev); 64 if (err < 0) 65 goto error_device_register; 66 return 0; 67 68error_device_register: 69 put_device(&umc->dev); 70 release_resource(&umc->resource); 71error_request_resource: 72 return err; 73} 74EXPORT_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 * disappear under our feet. 84 */ 85void umc_device_unregister(struct umc_dev *umc) 86{ 87 struct device *dev; 88 if (!umc) 89 return; 90 dev = get_device(&umc->dev); 91 device_unregister(&umc->dev); 92 release_resource(&umc->resource); 93 put_device(dev); 94} 95EXPORT_SYMBOL_GPL(umc_device_unregister); 96