[e7fade3] | 1 | /* Driver Manager Device Unregister (removal) implementation |
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| 2 | * |
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[65d1f35] | 3 | * COPYRIGHT (c) 2011 Cobham Gaisler AB. |
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[e7fade3] | 4 | * |
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| 5 | * The license and distribution terms for this file may be |
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| 6 | * found in the file LICENSE in this distribution or at |
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[0decc806] | 7 | * http://www.rtems.org/license/LICENSE. |
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[e7fade3] | 8 | */ |
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| 9 | |
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| 10 | #include <stdlib.h> |
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| 11 | |
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| 12 | #include <drvmgr/drvmgr.h> |
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| 13 | #include <drvmgr/drvmgr_list.h> |
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| 14 | #include "drvmgr_internal.h" |
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| 15 | |
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| 16 | /* Unregister all children on a bus. |
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| 17 | * |
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| 18 | * This function is called from the bus driver, from a "safe" state where |
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| 19 | * devices will not be added or removed on this particular bus at this time |
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| 20 | */ |
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| 21 | int drvmgr_children_unregister(struct drvmgr_bus *bus) |
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| 22 | { |
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| 23 | int err; |
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| 24 | |
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| 25 | while (bus->children != NULL) { |
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| 26 | err = drvmgr_dev_unregister(bus->children); |
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| 27 | if (err != DRVMGR_OK) { |
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| 28 | /* An error occured */ |
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| 29 | bus->children->error = err; |
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| 30 | return err; |
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| 31 | } |
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| 32 | } |
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| 33 | |
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| 34 | return DRVMGR_OK; |
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| 35 | } |
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| 36 | |
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| 37 | /* Unregister a BUS and all it's devices. |
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| 38 | * |
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| 39 | * It is up to the bus driver to remove all it's devices, either manually |
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| 40 | * one by one calling drvmgr_dev_unregister(), or by letting the driver |
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| 41 | * manager unregister all children by calling drvmgr_children_unregister(). |
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| 42 | */ |
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| 43 | int drvmgr_bus_unregister(struct drvmgr_bus *bus) |
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| 44 | { |
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[bb2f220] | 45 | struct drvmgr *mgr = &drvmgr; |
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[e7fade3] | 46 | struct drvmgr_list *list; |
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| 47 | |
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| 48 | if (bus->ops->remove == NULL) |
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| 49 | return DRVMGR_ENOSYS; |
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| 50 | |
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| 51 | /* Call Bus driver to clean things up, it must remove all children */ |
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| 52 | bus->error = bus->ops->remove(bus); |
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| 53 | if (bus->error != DRVMGR_OK) |
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| 54 | return bus->error; |
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| 55 | /* Check that bus driver has done its job and removed all children */ |
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| 56 | if (bus->children != NULL) |
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| 57 | return DRVMGR_FAIL; |
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| 58 | /* Remove References to bus */ |
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| 59 | bus->dev->bus = NULL; |
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| 60 | |
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| 61 | DRVMGR_LOCK_WRITE(); |
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| 62 | |
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| 63 | /* Remove bus from bus-list */ |
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| 64 | if (bus->state & BUS_STATE_LIST_INACTIVE) |
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| 65 | list = &mgr->buses_inactive; |
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| 66 | else |
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| 67 | list = &mgr->buses[bus->level]; |
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| 68 | drvmgr_list_remove(list, bus); |
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| 69 | |
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| 70 | DRVMGR_UNLOCK(); |
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| 71 | |
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| 72 | /* All references to this bus has been removed at this point */ |
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| 73 | free(bus); |
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| 74 | |
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| 75 | return DRVMGR_OK; |
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| 76 | } |
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| 77 | |
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| 78 | /* Separate Driver and Device from each other */ |
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| 79 | int drvmgr_dev_drv_separate(struct drvmgr_dev *dev) |
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| 80 | { |
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[bb2f220] | 81 | struct drvmgr *mgr = &drvmgr; |
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[e7fade3] | 82 | struct drvmgr_dev *subdev, **pprev; |
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| 83 | int rc; |
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| 84 | |
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| 85 | /* Remove children if this device exports a bus of devices. All |
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| 86 | * children must be removed first as they depend upon the bus |
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| 87 | * services this bridge provide. |
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| 88 | */ |
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| 89 | if (dev->bus) { |
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| 90 | rc = drvmgr_bus_unregister(dev->bus); |
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| 91 | if (rc != DRVMGR_OK) |
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| 92 | return rc; |
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| 93 | } |
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| 94 | |
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| 95 | if (dev->drv == NULL) |
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| 96 | return DRVMGR_OK; |
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| 97 | |
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| 98 | /* Remove device by letting assigned driver take care of hardware |
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| 99 | * issues |
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| 100 | */ |
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| 101 | if (!dev->drv->ops->remove) { |
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| 102 | /* No remove function is considered severe when someone |
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| 103 | * is trying to remove the device |
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| 104 | */ |
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| 105 | return DRVMGR_ENOSYS; |
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| 106 | } |
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| 107 | dev->error = dev->drv->ops->remove(dev); |
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| 108 | if (dev->error != DRVMGR_OK) |
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| 109 | return DRVMGR_FAIL; |
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| 110 | |
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| 111 | DRVMGR_LOCK_WRITE(); |
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| 112 | |
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| 113 | /* Delete device from driver's device list */ |
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| 114 | pprev = &dev->drv->dev; |
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| 115 | subdev = dev->drv->dev; |
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| 116 | while (subdev != dev) { |
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| 117 | pprev = &subdev->next_in_drv; |
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| 118 | subdev = subdev->next_in_drv; |
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| 119 | } |
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| 120 | *pprev = subdev->next_in_drv; |
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| 121 | dev->drv->dev_cnt--; |
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| 122 | |
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| 123 | /* Move device to inactive list */ |
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| 124 | drvmgr_list_remove(&mgr->devices[dev->level], dev); |
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| 125 | dev->level = 0; |
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| 126 | dev->state &= ~(DEV_STATE_UNITED|DEV_STATE_INIT_DONE); |
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| 127 | dev->state |= DEV_STATE_LIST_INACTIVE; |
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| 128 | drvmgr_list_add_tail(&mgr->devices_inactive, dev); |
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| 129 | |
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| 130 | DRVMGR_UNLOCK(); |
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| 131 | |
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| 132 | /* Free Device Driver Private memory if allocated previously by |
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| 133 | * Driver manager. |
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| 134 | */ |
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| 135 | if (dev->drv->dev_priv_size && dev->priv) { |
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| 136 | free(dev->priv); |
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| 137 | dev->priv = NULL; |
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| 138 | } |
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| 139 | dev->drv = NULL; |
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| 140 | |
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| 141 | return DRVMGR_OK; |
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| 142 | } |
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| 143 | |
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| 144 | /* Unregister device, |
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| 145 | * - let assigned driver handle deletion |
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| 146 | * - remove from device list |
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| 147 | * - remove from driver list |
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| 148 | * - remove from bus list |
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| 149 | */ |
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| 150 | int drvmgr_dev_unregister(struct drvmgr_dev *dev) |
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| 151 | { |
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[bb2f220] | 152 | struct drvmgr *mgr = &drvmgr; |
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[e7fade3] | 153 | struct drvmgr_dev *subdev, **pprev; |
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| 154 | int err; |
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| 155 | |
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| 156 | /* Separate device from driver, if the device is united with a driver. |
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| 157 | * |
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| 158 | * If this device is a bridge all child buses/devices are also removed. |
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| 159 | */ |
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| 160 | err = drvmgr_dev_drv_separate(dev); |
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| 161 | if (err != DRVMGR_OK) |
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| 162 | return err; |
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| 163 | |
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| 164 | DRVMGR_LOCK_WRITE(); |
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| 165 | |
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| 166 | /* Remove it from inactive list */ |
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| 167 | drvmgr_list_remove(&mgr->devices_inactive, dev); |
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| 168 | |
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| 169 | /* Remove device from parent bus list (no check if dev not in list) */ |
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| 170 | pprev = &dev->parent->children; |
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| 171 | subdev = dev->parent->children; |
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| 172 | while (subdev != dev) { |
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| 173 | pprev = &subdev->next_in_bus; |
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| 174 | subdev = subdev->next_in_bus; |
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| 175 | } |
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| 176 | *pprev = subdev->next_in_bus; |
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| 177 | dev->parent->dev_cnt--; |
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| 178 | |
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| 179 | DRVMGR_UNLOCK(); |
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| 180 | |
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| 181 | /* All references to this device has been removed at this point */ |
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| 182 | free(dev); |
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| 183 | |
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| 184 | return DRVMGR_OK; |
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| 185 | } |
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