Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * drivers/usb/core/usb.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * (C) Copyright Linus Torvalds 1999 |
| 5 | * (C) Copyright Johannes Erdfelt 1999-2001 |
| 6 | * (C) Copyright Andreas Gal 1999 |
| 7 | * (C) Copyright Gregory P. Smith 1999 |
| 8 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| 9 | * (C) Copyright Randy Dunlap 2000 |
| 10 | * (C) Copyright David Brownell 2000-2004 |
| 11 | * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| 12 | * (usb_device_id matching changes by Adam J. Richter) |
| 13 | * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| 14 | * |
| 15 | * NOTE! This is not actually a driver at all, rather this is |
| 16 | * just a collection of helper routines that implement the |
| 17 | * generic USB things that the real drivers can use.. |
| 18 | * |
| 19 | * Think of this as a "USB library" rather than anything else. |
| 20 | * It should be considered a slave, with no callbacks. Callbacks |
| 21 | * are evil. |
| 22 | */ |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 25 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/string.h> |
| 27 | #include <linux/bitops.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/interrupt.h> /* for in_interrupt() */ |
| 30 | #include <linux/kmod.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/spinlock.h> |
| 33 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/usb.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 35 | #include <linux/mutex.h> |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 36 | #include <linux/workqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/io.h> |
Adrian Bunk | 87ae9af | 2007-10-30 10:35:04 +0100 | [diff] [blame] | 39 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/mm.h> |
| 41 | #include <linux/dma-mapping.h> |
| 42 | |
| 43 | #include "hcd.h" |
| 44 | #include "usb.h" |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | const char *usbcore_name = "usbcore"; |
| 48 | |
| 49 | static int nousb; /* Disable USB when built into kernel image */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 51 | /* Workqueue for autosuspend and for remote wakeup of root hubs */ |
| 52 | struct workqueue_struct *ksuspend_usb_wq; |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 53 | |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 54 | #ifdef CONFIG_USB_SUSPEND |
| 55 | static int usb_autosuspend_delay = 2; /* Default delay value, |
| 56 | * in seconds */ |
Alan Stern | eaafbc3 | 2007-03-13 16:39:15 -0400 | [diff] [blame] | 57 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 58 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
| 59 | |
| 60 | #else |
| 61 | #define usb_autosuspend_delay 0 |
| 62 | #endif |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | /** |
| 66 | * usb_ifnum_to_if - get the interface object with a given interface number |
| 67 | * @dev: the device whose current configuration is considered |
| 68 | * @ifnum: the desired interface |
| 69 | * |
| 70 | * This walks the device descriptor for the currently active configuration |
| 71 | * and returns a pointer to the interface with that particular interface |
| 72 | * number, or null. |
| 73 | * |
| 74 | * Note that configuration descriptors are not required to assign interface |
| 75 | * numbers sequentially, so that it would be incorrect to assume that |
| 76 | * the first interface in that descriptor corresponds to interface zero. |
| 77 | * This routine helps device drivers avoid such mistakes. |
| 78 | * However, you should make sure that you do the right thing with any |
| 79 | * alternate settings available for this interfaces. |
| 80 | * |
| 81 | * Don't call this function unless you are bound to one of the interfaces |
| 82 | * on this device or you have locked the device! |
| 83 | */ |
Luiz Fernando N. Capitulino | 095bc33 | 2006-08-26 23:48:11 -0300 | [diff] [blame] | 84 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
| 85 | unsigned ifnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
| 87 | struct usb_host_config *config = dev->actconfig; |
| 88 | int i; |
| 89 | |
| 90 | if (!config) |
| 91 | return NULL; |
| 92 | for (i = 0; i < config->desc.bNumInterfaces; i++) |
| 93 | if (config->interface[i]->altsetting[0] |
| 94 | .desc.bInterfaceNumber == ifnum) |
| 95 | return config->interface[i]; |
| 96 | |
| 97 | return NULL; |
| 98 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 99 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | /** |
Randy Dunlap | d0bcabc | 2008-02-29 22:03:07 -0800 | [diff] [blame] | 102 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | * @intf: the interface containing the altsetting in question |
| 104 | * @altnum: the desired alternate setting number |
| 105 | * |
| 106 | * This searches the altsetting array of the specified interface for |
| 107 | * an entry with the correct bAlternateSetting value and returns a pointer |
| 108 | * to that entry, or null. |
| 109 | * |
| 110 | * Note that altsettings need not be stored sequentially by number, so |
| 111 | * it would be incorrect to assume that the first altsetting entry in |
| 112 | * the array corresponds to altsetting zero. This routine helps device |
| 113 | * drivers avoid such mistakes. |
| 114 | * |
| 115 | * Don't call this function unless you are bound to the intf interface |
| 116 | * or you have locked the device! |
| 117 | */ |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 118 | struct usb_host_interface *usb_altnum_to_altsetting( |
| 119 | const struct usb_interface *intf, |
| 120 | unsigned int altnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
| 122 | int i; |
| 123 | |
| 124 | for (i = 0; i < intf->num_altsetting; i++) { |
| 125 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) |
| 126 | return &intf->altsetting[i]; |
| 127 | } |
| 128 | return NULL; |
| 129 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 130 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 132 | struct find_interface_arg { |
| 133 | int minor; |
| 134 | struct usb_interface *interface; |
| 135 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 137 | static int __find_interface(struct device *dev, void *data) |
mochel@digitalimplant.org | 6034a08 | 2005-03-21 11:09:40 -0800 | [diff] [blame] | 138 | { |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 139 | struct find_interface_arg *arg = data; |
| 140 | struct usb_interface *intf; |
mochel@digitalimplant.org | 6034a08 | 2005-03-21 11:09:40 -0800 | [diff] [blame] | 141 | |
| 142 | /* can't look at usb devices, only interfaces */ |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 143 | if (is_usb_device(dev)) |
mochel@digitalimplant.org | 6034a08 | 2005-03-21 11:09:40 -0800 | [diff] [blame] | 144 | return 0; |
| 145 | |
| 146 | intf = to_usb_interface(dev); |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 147 | if (intf->minor != -1 && intf->minor == arg->minor) { |
| 148 | arg->interface = intf; |
mochel@digitalimplant.org | 6034a08 | 2005-03-21 11:09:40 -0800 | [diff] [blame] | 149 | return 1; |
| 150 | } |
| 151 | return 0; |
| 152 | } |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /** |
| 155 | * usb_find_interface - find usb_interface pointer for driver and device |
| 156 | * @drv: the driver whose current configuration is considered |
| 157 | * @minor: the minor number of the desired device |
| 158 | * |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 159 | * This walks the driver device list and returns a pointer to the interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | * with the matching minor. Note, this only works for devices that share the |
| 161 | * USB major number. |
| 162 | */ |
| 163 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) |
| 164 | { |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 165 | struct find_interface_arg argb; |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 166 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 168 | argb.minor = minor; |
| 169 | argb.interface = NULL; |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 170 | /* eat the error, it will be in argb.interface */ |
| 171 | retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb, |
| 172 | __find_interface); |
Pete Zaitcev | f5691d7 | 2005-12-21 17:24:54 -0800 | [diff] [blame] | 173 | return argb.interface; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 175 | EXPORT_SYMBOL_GPL(usb_find_interface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | /** |
| 178 | * usb_release_dev - free a usb device structure when all users of it are finished. |
| 179 | * @dev: device that's been disconnected |
| 180 | * |
| 181 | * Will be called only by the device core when all users of this usb device are |
| 182 | * done. |
| 183 | */ |
| 184 | static void usb_release_dev(struct device *dev) |
| 185 | { |
| 186 | struct usb_device *udev; |
| 187 | |
| 188 | udev = to_usb_device(dev); |
| 189 | |
| 190 | usb_destroy_configuration(udev); |
Alan Stern | 1720058 | 2006-08-30 11:32:52 -0400 | [diff] [blame] | 191 | usb_put_hcd(bus_to_hcd(udev->bus)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | kfree(udev->product); |
| 193 | kfree(udev->manufacturer); |
| 194 | kfree(udev->serial); |
| 195 | kfree(udev); |
| 196 | } |
| 197 | |
Alan Stern | 4a9bee8 | 2007-11-06 15:01:52 -0500 | [diff] [blame] | 198 | #ifdef CONFIG_HOTPLUG |
| 199 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 200 | { |
| 201 | struct usb_device *usb_dev; |
| 202 | |
| 203 | usb_dev = to_usb_device(dev); |
| 204 | |
| 205 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) |
| 206 | return -ENOMEM; |
| 207 | |
| 208 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) |
| 209 | return -ENOMEM; |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | #else |
| 215 | |
| 216 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 217 | { |
| 218 | return -ENODEV; |
| 219 | } |
| 220 | #endif /* CONFIG_HOTPLUG */ |
| 221 | |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 222 | struct device_type usb_device_type = { |
| 223 | .name = "usb_device", |
| 224 | .release = usb_release_dev, |
Alan Stern | 4a9bee8 | 2007-11-06 15:01:52 -0500 | [diff] [blame] | 225 | .uevent = usb_dev_uevent, |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 226 | }; |
| 227 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 228 | #ifdef CONFIG_PM |
| 229 | |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 230 | static int ksuspend_usb_init(void) |
| 231 | { |
Alan Stern | 7ed92f1 | 2007-05-22 09:38:39 -0400 | [diff] [blame] | 232 | /* This workqueue is supposed to be both freezable and |
| 233 | * singlethreaded. Its job doesn't justify running on more |
| 234 | * than one CPU. |
| 235 | */ |
Alan Stern | 4145ed6 | 2007-11-19 10:15:02 -0500 | [diff] [blame] | 236 | ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd"); |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 237 | if (!ksuspend_usb_wq) |
| 238 | return -ENOMEM; |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static void ksuspend_usb_cleanup(void) |
| 243 | { |
| 244 | destroy_workqueue(ksuspend_usb_wq); |
| 245 | } |
| 246 | |
Alan Stern | db06350 | 2006-11-13 15:02:04 -0500 | [diff] [blame] | 247 | #else |
| 248 | |
| 249 | #define ksuspend_usb_init() 0 |
| 250 | #define ksuspend_usb_cleanup() do {} while (0) |
| 251 | |
| 252 | #endif /* CONFIG_PM */ |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 253 | |
Inaky Perez-Gonzalez | d7d0725 | 2007-07-31 20:34:00 -0700 | [diff] [blame] | 254 | |
| 255 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ |
| 256 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) |
| 257 | { |
| 258 | struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); |
| 259 | return hcd->wireless; |
| 260 | } |
| 261 | |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /** |
| 264 | * usb_alloc_dev - usb device constructor (usbcore-internal) |
| 265 | * @parent: hub to which device is connected; null to allocate a root hub |
| 266 | * @bus: bus used to access the device |
| 267 | * @port1: one-based index of port; ignored for root hubs |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 268 | * Context: !in_interrupt() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | * |
| 270 | * Only hub drivers (including virtual root hub drivers for host |
| 271 | * controllers) should ever call this. |
| 272 | * |
| 273 | * This call may not be used in a non-sleeping context. |
| 274 | */ |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 275 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
| 276 | struct usb_bus *bus, unsigned port1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
| 278 | struct usb_device *dev; |
Inaky Perez-Gonzalez | d7d0725 | 2007-07-31 20:34:00 -0700 | [diff] [blame] | 279 | struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); |
| 280 | unsigned root_hub = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Alan Stern | 0a1ef3b | 2005-10-24 15:38:24 -0400 | [diff] [blame] | 282 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | if (!dev) |
| 284 | return NULL; |
| 285 | |
Alan Stern | 1720058 | 2006-08-30 11:32:52 -0400 | [diff] [blame] | 286 | if (!usb_get_hcd(bus_to_hcd(bus))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | kfree(dev); |
| 288 | return NULL; |
| 289 | } |
| 290 | |
| 291 | device_initialize(&dev->dev); |
| 292 | dev->dev.bus = &usb_bus_type; |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 293 | dev->dev.type = &usb_device_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | dev->dev.dma_mask = bus->controller->dma_mask; |
Yinghai Lu | 70f458f | 2007-07-09 12:03:09 -0700 | [diff] [blame] | 295 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | dev->state = USB_STATE_ATTACHED; |
Sarah Sharp | 4d59d8a | 2007-10-03 14:56:03 -0700 | [diff] [blame] | 297 | atomic_set(&dev->urbnum, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | INIT_LIST_HEAD(&dev->ep0.urb_list); |
| 300 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; |
| 301 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; |
| 302 | /* ep0 maxpacket comes later, from device descriptor */ |
Alan Stern | bdd016b | 2007-07-30 17:05:22 -0400 | [diff] [blame] | 303 | usb_enable_endpoint(dev, &dev->ep0); |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 304 | dev->can_submit = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | /* Save readable and stable topology id, distinguishing devices |
| 307 | * by location for diagnostics, tools, driver model, etc. The |
| 308 | * string is a path along hub ports, from the root. Each device's |
| 309 | * dev->devpath will be stable until USB is re-cabled, and hubs |
| 310 | * are often labeled with these port numbers. The bus_id isn't |
| 311 | * as stable: bus->busnum changes easily from modprobe order, |
| 312 | * cardbus or pci hotplugging, and so on. |
| 313 | */ |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 314 | if (unlikely(!parent)) { |
| 315 | dev->devpath[0] = '0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | dev->dev.parent = bus->controller; |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 318 | sprintf(&dev->dev.bus_id[0], "usb%d", bus->busnum); |
Inaky Perez-Gonzalez | d7d0725 | 2007-07-31 20:34:00 -0700 | [diff] [blame] | 319 | root_hub = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } else { |
| 321 | /* match any labeling on the hubs; it's one-based */ |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 322 | if (parent->devpath[0] == '0') |
| 323 | snprintf(dev->devpath, sizeof dev->devpath, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | "%d", port1); |
| 325 | else |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 326 | snprintf(dev->devpath, sizeof dev->devpath, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | "%s.%d", parent->devpath, port1); |
| 328 | |
| 329 | dev->dev.parent = &parent->dev; |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 330 | sprintf(&dev->dev.bus_id[0], "%d-%s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | bus->busnum, dev->devpath); |
| 332 | |
| 333 | /* hub driver sets up TT records */ |
| 334 | } |
| 335 | |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 336 | dev->portnum = port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | dev->bus = bus; |
| 338 | dev->parent = parent; |
| 339 | INIT_LIST_HEAD(&dev->filelist); |
| 340 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 341 | #ifdef CONFIG_PM |
| 342 | mutex_init(&dev->pm_mutex); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 343 | INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 344 | dev->autosuspend_delay = usb_autosuspend_delay * HZ; |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 345 | dev->connect_time = jiffies; |
| 346 | dev->active_duration = -jiffies; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 347 | #endif |
Inaky Perez-Gonzalez | d7d0725 | 2007-07-31 20:34:00 -0700 | [diff] [blame] | 348 | if (root_hub) /* Root hub always ok [and always wired] */ |
| 349 | dev->authorized = 1; |
| 350 | else { |
| 351 | dev->authorized = usb_hcd->authorized_default; |
| 352 | dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; |
| 353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return dev; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * usb_get_dev - increments the reference count of the usb device structure |
| 359 | * @dev: the device being referenced |
| 360 | * |
| 361 | * Each live reference to a device should be refcounted. |
| 362 | * |
| 363 | * Drivers for USB interfaces should normally record such references in |
| 364 | * their probe() methods, when they bind to an interface, and release |
| 365 | * them by calling usb_put_dev(), in their disconnect() methods. |
| 366 | * |
| 367 | * A pointer to the device with the incremented reference counter is returned. |
| 368 | */ |
| 369 | struct usb_device *usb_get_dev(struct usb_device *dev) |
| 370 | { |
| 371 | if (dev) |
| 372 | get_device(&dev->dev); |
| 373 | return dev; |
| 374 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 375 | EXPORT_SYMBOL_GPL(usb_get_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | /** |
| 378 | * usb_put_dev - release a use of the usb device structure |
| 379 | * @dev: device that's been disconnected |
| 380 | * |
| 381 | * Must be called when a user of a device is finished with it. When the last |
| 382 | * user of the device calls this function, the memory of the device is freed. |
| 383 | */ |
| 384 | void usb_put_dev(struct usb_device *dev) |
| 385 | { |
| 386 | if (dev) |
| 387 | put_device(&dev->dev); |
| 388 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 389 | EXPORT_SYMBOL_GPL(usb_put_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | /** |
| 392 | * usb_get_intf - increments the reference count of the usb interface structure |
| 393 | * @intf: the interface being referenced |
| 394 | * |
| 395 | * Each live reference to a interface must be refcounted. |
| 396 | * |
| 397 | * Drivers for USB interfaces should normally record such references in |
| 398 | * their probe() methods, when they bind to an interface, and release |
| 399 | * them by calling usb_put_intf(), in their disconnect() methods. |
| 400 | * |
| 401 | * A pointer to the interface with the incremented reference counter is |
| 402 | * returned. |
| 403 | */ |
| 404 | struct usb_interface *usb_get_intf(struct usb_interface *intf) |
| 405 | { |
| 406 | if (intf) |
| 407 | get_device(&intf->dev); |
| 408 | return intf; |
| 409 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 410 | EXPORT_SYMBOL_GPL(usb_get_intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | /** |
| 413 | * usb_put_intf - release a use of the usb interface structure |
| 414 | * @intf: interface that's been decremented |
| 415 | * |
| 416 | * Must be called when a user of an interface is finished with it. When the |
| 417 | * last user of the interface calls this function, the memory of the interface |
| 418 | * is freed. |
| 419 | */ |
| 420 | void usb_put_intf(struct usb_interface *intf) |
| 421 | { |
| 422 | if (intf) |
| 423 | put_device(&intf->dev); |
| 424 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 425 | EXPORT_SYMBOL_GPL(usb_put_intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
| 427 | /* USB device locking |
| 428 | * |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 429 | * USB devices and interfaces are locked using the semaphore in their |
| 430 | * embedded struct device. The hub driver guarantees that whenever a |
| 431 | * device is connected or disconnected, drivers are called with the |
| 432 | * USB device locked as well as their particular interface. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | * |
| 434 | * Complications arise when several devices are to be locked at the same |
| 435 | * time. Only hub-aware drivers that are part of usbcore ever have to |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 436 | * do this; nobody else needs to worry about it. The rule for locking |
| 437 | * is simple: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | * |
| 439 | * When locking both a device and its parent, always lock the |
| 440 | * the parent first. |
| 441 | */ |
| 442 | |
| 443 | /** |
Randy Dunlap | d0bcabc | 2008-02-29 22:03:07 -0800 | [diff] [blame] | 444 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | * @udev: device that's being locked |
| 446 | * @iface: interface bound to the driver making the request (optional) |
| 447 | * |
| 448 | * Attempts to acquire the device lock, but fails if the device is |
| 449 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface |
| 450 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the |
| 451 | * lock, the routine polls repeatedly. This is to prevent deadlock with |
| 452 | * disconnect; in some drivers (such as usb-storage) the disconnect() |
Alan Stern | 3ea1596 | 2005-08-11 10:15:39 -0400 | [diff] [blame] | 453 | * or suspend() method will block waiting for a device reset to complete. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | * |
| 455 | * Returns a negative error code for failure, otherwise 1 or 0 to indicate |
| 456 | * that the device will or will not have to be unlocked. (0 can be |
| 457 | * returned when an interface is given and is BINDING, because in that |
| 458 | * case the driver already owns the device lock.) |
| 459 | */ |
| 460 | int usb_lock_device_for_reset(struct usb_device *udev, |
Luiz Fernando N. Capitulino | 095bc33 | 2006-08-26 23:48:11 -0300 | [diff] [blame] | 461 | const struct usb_interface *iface) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Alan Stern | 3ea1596 | 2005-08-11 10:15:39 -0400 | [diff] [blame] | 463 | unsigned long jiffies_expire = jiffies + HZ; |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (udev->state == USB_STATE_NOTATTACHED) |
| 466 | return -ENODEV; |
| 467 | if (udev->state == USB_STATE_SUSPENDED) |
| 468 | return -EHOSTUNREACH; |
| 469 | if (iface) { |
| 470 | switch (iface->condition) { |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 471 | case USB_INTERFACE_BINDING: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | return 0; |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 473 | case USB_INTERFACE_BOUND: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | break; |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 475 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return -EINTR; |
| 477 | } |
| 478 | } |
| 479 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 480 | while (usb_trylock_device(udev) != 0) { |
Alan Stern | 3ea1596 | 2005-08-11 10:15:39 -0400 | [diff] [blame] | 481 | |
| 482 | /* If we can't acquire the lock after waiting one second, |
| 483 | * we're probably deadlocked */ |
| 484 | if (time_after(jiffies, jiffies_expire)) |
| 485 | return -EBUSY; |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | msleep(15); |
| 488 | if (udev->state == USB_STATE_NOTATTACHED) |
| 489 | return -ENODEV; |
| 490 | if (udev->state == USB_STATE_SUSPENDED) |
| 491 | return -EHOSTUNREACH; |
| 492 | if (iface && iface->condition != USB_INTERFACE_BOUND) |
| 493 | return -EINTR; |
| 494 | } |
| 495 | return 1; |
| 496 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 497 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | static struct usb_device *match_device(struct usb_device *dev, |
| 500 | u16 vendor_id, u16 product_id) |
| 501 | { |
| 502 | struct usb_device *ret_dev = NULL; |
| 503 | int child; |
| 504 | |
| 505 | dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", |
| 506 | le16_to_cpu(dev->descriptor.idVendor), |
| 507 | le16_to_cpu(dev->descriptor.idProduct)); |
| 508 | |
| 509 | /* see if this device matches */ |
| 510 | if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && |
| 511 | (product_id == le16_to_cpu(dev->descriptor.idProduct))) { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 512 | dev_dbg(&dev->dev, "matched this device!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | ret_dev = usb_get_dev(dev); |
| 514 | goto exit; |
| 515 | } |
| 516 | |
| 517 | /* look through all of the children of this device */ |
| 518 | for (child = 0; child < dev->maxchild; ++child) { |
| 519 | if (dev->children[child]) { |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 520 | usb_lock_device(dev->children[child]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | ret_dev = match_device(dev->children[child], |
| 522 | vendor_id, product_id); |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 523 | usb_unlock_device(dev->children[child]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | if (ret_dev) |
| 525 | goto exit; |
| 526 | } |
| 527 | } |
| 528 | exit: |
| 529 | return ret_dev; |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * usb_find_device - find a specific usb device in the system |
| 534 | * @vendor_id: the vendor id of the device to find |
| 535 | * @product_id: the product id of the device to find |
| 536 | * |
| 537 | * Returns a pointer to a struct usb_device if such a specified usb |
| 538 | * device is present in the system currently. The usage count of the |
| 539 | * device will be incremented if a device is found. Make sure to call |
| 540 | * usb_put_dev() when the caller is finished with the device. |
| 541 | * |
| 542 | * If a device with the specified vendor and product id is not found, |
| 543 | * NULL is returned. |
| 544 | */ |
| 545 | struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) |
| 546 | { |
| 547 | struct list_head *buslist; |
| 548 | struct usb_bus *bus; |
| 549 | struct usb_device *dev = NULL; |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 550 | |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 551 | mutex_lock(&usb_bus_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | for (buslist = usb_bus_list.next; |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 553 | buslist != &usb_bus_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | buslist = buslist->next) { |
| 555 | bus = container_of(buslist, struct usb_bus, bus_list); |
| 556 | if (!bus->root_hub) |
| 557 | continue; |
| 558 | usb_lock_device(bus->root_hub); |
| 559 | dev = match_device(bus->root_hub, vendor_id, product_id); |
| 560 | usb_unlock_device(bus->root_hub); |
| 561 | if (dev) |
| 562 | goto exit; |
| 563 | } |
| 564 | exit: |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 565 | mutex_unlock(&usb_bus_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | return dev; |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * usb_get_current_frame_number - return current bus frame number |
| 571 | * @dev: the device whose bus is being queried |
| 572 | * |
| 573 | * Returns the current frame number for the USB host controller |
| 574 | * used with the given USB device. This can be used when scheduling |
| 575 | * isochronous requests. |
| 576 | * |
| 577 | * Note that different kinds of host controller have different |
| 578 | * "scheduling horizons". While one type might support scheduling only |
| 579 | * 32 frames into the future, others could support scheduling up to |
| 580 | * 1024 frames into the future. |
| 581 | */ |
| 582 | int usb_get_current_frame_number(struct usb_device *dev) |
| 583 | { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 584 | return usb_hcd_get_frame_number(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 586 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | /*-------------------------------------------------------------------*/ |
| 589 | /* |
| 590 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the |
| 591 | * extra field of the interface and endpoint descriptor structs. |
| 592 | */ |
| 593 | |
| 594 | int __usb_get_extra_descriptor(char *buffer, unsigned size, |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 595 | unsigned char type, void **ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | { |
| 597 | struct usb_descriptor_header *header; |
| 598 | |
| 599 | while (size >= sizeof(struct usb_descriptor_header)) { |
| 600 | header = (struct usb_descriptor_header *)buffer; |
| 601 | |
| 602 | if (header->bLength < 2) { |
| 603 | printk(KERN_ERR |
| 604 | "%s: bogus descriptor, type %d length %d\n", |
| 605 | usbcore_name, |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 606 | header->bDescriptorType, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | header->bLength); |
| 608 | return -1; |
| 609 | } |
| 610 | |
| 611 | if (header->bDescriptorType == type) { |
| 612 | *ptr = header; |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | buffer += header->bLength; |
| 617 | size -= header->bLength; |
| 618 | } |
| 619 | return -1; |
| 620 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 621 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | /** |
| 624 | * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
| 625 | * @dev: device the buffer will be used with |
| 626 | * @size: requested buffer size |
| 627 | * @mem_flags: affect whether allocation may block |
| 628 | * @dma: used to return DMA address of buffer |
| 629 | * |
| 630 | * Return value is either null (indicating no buffer could be allocated), or |
| 631 | * the cpu-space pointer to a buffer that may be used to perform DMA to the |
| 632 | * specified device. Such cpu-space buffers are returned along with the DMA |
| 633 | * address (through the pointer provided). |
| 634 | * |
| 635 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
David Brownell | fbf54dd | 2007-07-01 23:33:12 -0700 | [diff] [blame] | 636 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
| 637 | * hardware during URB completion/resubmit. The implementation varies between |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | * platforms, depending on details of how DMA will work to this device. |
David Brownell | fbf54dd | 2007-07-01 23:33:12 -0700 | [diff] [blame] | 639 | * Using these buffers also eliminates cacheline sharing problems on |
| 640 | * architectures where CPU caches are not DMA-coherent. On systems without |
| 641 | * bus-snooping caches, these buffers are uncached. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | * |
| 643 | * When the buffer is no longer used, free it with usb_buffer_free(). |
| 644 | */ |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 645 | void *usb_buffer_alloc(struct usb_device *dev, size_t size, gfp_t mem_flags, |
| 646 | dma_addr_t *dma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Alan Stern | a6d2bb9 | 2006-08-30 11:27:36 -0400 | [diff] [blame] | 648 | if (!dev || !dev->bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | return NULL; |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 650 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 652 | EXPORT_SYMBOL_GPL(usb_buffer_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
| 654 | /** |
| 655 | * usb_buffer_free - free memory allocated with usb_buffer_alloc() |
| 656 | * @dev: device the buffer was used with |
| 657 | * @size: requested buffer size |
| 658 | * @addr: CPU address of buffer |
| 659 | * @dma: DMA address of buffer |
| 660 | * |
| 661 | * This reclaims an I/O buffer, letting it be reused. The memory must have |
| 662 | * been allocated using usb_buffer_alloc(), and the parameters must match |
David Brownell | fbf54dd | 2007-07-01 23:33:12 -0700 | [diff] [blame] | 663 | * those provided in that allocation request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | */ |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 665 | void usb_buffer_free(struct usb_device *dev, size_t size, void *addr, |
| 666 | dma_addr_t dma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Alan Stern | a6d2bb9 | 2006-08-30 11:27:36 -0400 | [diff] [blame] | 668 | if (!dev || !dev->bus) |
Dmitry Torokhov | b94badb | 2006-08-01 22:33:34 -0400 | [diff] [blame] | 669 | return; |
| 670 | if (!addr) |
| 671 | return; |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 672 | hcd_buffer_free(dev->bus, size, addr, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 674 | EXPORT_SYMBOL_GPL(usb_buffer_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
| 676 | /** |
| 677 | * usb_buffer_map - create DMA mapping(s) for an urb |
| 678 | * @urb: urb whose transfer_buffer/setup_packet will be mapped |
| 679 | * |
| 680 | * Return value is either null (indicating no buffer could be mapped), or |
| 681 | * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are |
| 682 | * added to urb->transfer_flags if the operation succeeds. If the device |
| 683 | * is connected to this system through a non-DMA controller, this operation |
| 684 | * always succeeds. |
| 685 | * |
| 686 | * This call would normally be used for an urb which is reused, perhaps |
| 687 | * as the target of a large periodic transfer, with usb_buffer_dmasync() |
| 688 | * calls to synchronize memory and dma state. |
| 689 | * |
| 690 | * Reverse the effect of this call with usb_buffer_unmap(). |
| 691 | */ |
| 692 | #if 0 |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 693 | struct urb *usb_buffer_map(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | { |
| 695 | struct usb_bus *bus; |
| 696 | struct device *controller; |
| 697 | |
| 698 | if (!urb |
| 699 | || !urb->dev |
| 700 | || !(bus = urb->dev->bus) |
| 701 | || !(controller = bus->controller)) |
| 702 | return NULL; |
| 703 | |
| 704 | if (controller->dma_mask) { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 705 | urb->transfer_dma = dma_map_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | urb->transfer_buffer, urb->transfer_buffer_length, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 707 | usb_pipein(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 709 | if (usb_pipecontrol(urb->pipe)) |
| 710 | urb->setup_dma = dma_map_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | urb->setup_packet, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 712 | sizeof(struct usb_ctrlrequest), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | DMA_TO_DEVICE); |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 714 | /* FIXME generic api broken like pci, can't report errors */ |
| 715 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | } else |
| 717 | urb->transfer_dma = ~0; |
| 718 | urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP |
| 719 | | URB_NO_SETUP_DMA_MAP); |
| 720 | return urb; |
| 721 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 722 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | #endif /* 0 */ |
| 724 | |
| 725 | /* XXX DISABLED, no users currently. If you wish to re-enable this |
| 726 | * XXX please determine whether the sync is to transfer ownership of |
| 727 | * XXX the buffer from device to cpu or vice verse, and thusly use the |
| 728 | * XXX appropriate _for_{cpu,device}() method. -DaveM |
| 729 | */ |
| 730 | #if 0 |
| 731 | |
| 732 | /** |
| 733 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) |
| 734 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized |
| 735 | */ |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 736 | void usb_buffer_dmasync(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | { |
| 738 | struct usb_bus *bus; |
| 739 | struct device *controller; |
| 740 | |
| 741 | if (!urb |
| 742 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| 743 | || !urb->dev |
| 744 | || !(bus = urb->dev->bus) |
| 745 | || !(controller = bus->controller)) |
| 746 | return; |
| 747 | |
| 748 | if (controller->dma_mask) { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 749 | dma_sync_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | urb->transfer_dma, urb->transfer_buffer_length, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 751 | usb_pipein(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 753 | if (usb_pipecontrol(urb->pipe)) |
| 754 | dma_sync_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | urb->setup_dma, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 756 | sizeof(struct usb_ctrlrequest), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | DMA_TO_DEVICE); |
| 758 | } |
| 759 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 760 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | #endif |
| 762 | |
| 763 | /** |
| 764 | * usb_buffer_unmap - free DMA mapping(s) for an urb |
| 765 | * @urb: urb whose transfer_buffer will be unmapped |
| 766 | * |
| 767 | * Reverses the effect of usb_buffer_map(). |
| 768 | */ |
| 769 | #if 0 |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 770 | void usb_buffer_unmap(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
| 772 | struct usb_bus *bus; |
| 773 | struct device *controller; |
| 774 | |
| 775 | if (!urb |
| 776 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| 777 | || !urb->dev |
| 778 | || !(bus = urb->dev->bus) |
| 779 | || !(controller = bus->controller)) |
| 780 | return; |
| 781 | |
| 782 | if (controller->dma_mask) { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 783 | dma_unmap_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | urb->transfer_dma, urb->transfer_buffer_length, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 785 | usb_pipein(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 787 | if (usb_pipecontrol(urb->pipe)) |
| 788 | dma_unmap_single(controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | urb->setup_dma, |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 790 | sizeof(struct usb_ctrlrequest), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | DMA_TO_DEVICE); |
| 792 | } |
| 793 | urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP |
| 794 | | URB_NO_SETUP_DMA_MAP); |
| 795 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 796 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | #endif /* 0 */ |
| 798 | |
| 799 | /** |
| 800 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint |
| 801 | * @dev: device to which the scatterlist will be mapped |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 802 | * @is_in: mapping transfer direction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * @sg: the scatterlist to map |
| 804 | * @nents: the number of entries in the scatterlist |
| 805 | * |
| 806 | * Return value is either < 0 (indicating no buffers could be mapped), or |
| 807 | * the number of DMA mapping array entries in the scatterlist. |
| 808 | * |
| 809 | * The caller is responsible for placing the resulting DMA addresses from |
| 810 | * the scatterlist into URB transfer buffer pointers, and for setting the |
| 811 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. |
| 812 | * |
| 813 | * Top I/O rates come from queuing URBs, instead of waiting for each one |
| 814 | * to complete before starting the next I/O. This is particularly easy |
| 815 | * to do with scatterlists. Just allocate and submit one URB for each DMA |
| 816 | * mapping entry returned, stopping on the first error or when all succeed. |
| 817 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. |
| 818 | * |
| 819 | * This call would normally be used when translating scatterlist requests, |
| 820 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it |
| 821 | * may be able to coalesce mappings for improved I/O efficiency. |
| 822 | * |
| 823 | * Reverse the effect of this call with usb_buffer_unmap_sg(). |
| 824 | */ |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 825 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
Luiz Fernando N. Capitulino | 095bc33 | 2006-08-26 23:48:11 -0300 | [diff] [blame] | 826 | struct scatterlist *sg, int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
| 828 | struct usb_bus *bus; |
| 829 | struct device *controller; |
| 830 | |
| 831 | if (!dev |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | || !(bus = dev->bus) |
| 833 | || !(controller = bus->controller) |
| 834 | || !controller->dma_mask) |
| 835 | return -1; |
| 836 | |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 837 | /* FIXME generic api broken like pci, can't report errors */ |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 838 | return dma_map_sg(controller, sg, nents, |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 839 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 841 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | /* XXX DISABLED, no users currently. If you wish to re-enable this |
| 844 | * XXX please determine whether the sync is to transfer ownership of |
| 845 | * XXX the buffer from device to cpu or vice verse, and thusly use the |
| 846 | * XXX appropriate _for_{cpu,device}() method. -DaveM |
| 847 | */ |
| 848 | #if 0 |
| 849 | |
| 850 | /** |
| 851 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) |
| 852 | * @dev: device to which the scatterlist will be mapped |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 853 | * @is_in: mapping transfer direction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | * @sg: the scatterlist to synchronize |
| 855 | * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| 856 | * |
| 857 | * Use this when you are re-using a scatterlist's data buffers for |
| 858 | * another USB request. |
| 859 | */ |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 860 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
Luiz Fernando N. Capitulino | 095bc33 | 2006-08-26 23:48:11 -0300 | [diff] [blame] | 861 | struct scatterlist *sg, int n_hw_ents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | struct usb_bus *bus; |
| 864 | struct device *controller; |
| 865 | |
| 866 | if (!dev |
| 867 | || !(bus = dev->bus) |
| 868 | || !(controller = bus->controller) |
| 869 | || !controller->dma_mask) |
| 870 | return; |
| 871 | |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 872 | dma_sync_sg(controller, sg, n_hw_ents, |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 873 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 875 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | #endif |
| 877 | |
| 878 | /** |
| 879 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist |
| 880 | * @dev: device to which the scatterlist will be mapped |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 881 | * @is_in: mapping transfer direction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | * @sg: the scatterlist to unmap |
| 883 | * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| 884 | * |
| 885 | * Reverses the effect of usb_buffer_map_sg(). |
| 886 | */ |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 887 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
Luiz Fernando N. Capitulino | 095bc33 | 2006-08-26 23:48:11 -0300 | [diff] [blame] | 888 | struct scatterlist *sg, int n_hw_ents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | { |
| 890 | struct usb_bus *bus; |
| 891 | struct device *controller; |
| 892 | |
| 893 | if (!dev |
| 894 | || !(bus = dev->bus) |
| 895 | || !(controller = bus->controller) |
| 896 | || !controller->dma_mask) |
| 897 | return; |
| 898 | |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 899 | dma_unmap_sg(controller, sg, n_hw_ents, |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 900 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 902 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | /* format to disable USB on kernel command line is: nousb */ |
Pete Zaitcev | aafbf24 | 2005-12-20 14:15:04 -0800 | [diff] [blame] | 905 | __module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | /* |
| 908 | * for external read access to <nousb> |
| 909 | */ |
| 910 | int usb_disabled(void) |
| 911 | { |
| 912 | return nousb; |
| 913 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 914 | EXPORT_SYMBOL_GPL(usb_disabled); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
| 916 | /* |
| 917 | * Init |
| 918 | */ |
| 919 | static int __init usb_init(void) |
| 920 | { |
| 921 | int retval; |
| 922 | if (nousb) { |
Oliver Neukum | 9251644 | 2007-01-23 15:55:28 -0500 | [diff] [blame] | 923 | pr_info("%s: USB support disabled\n", usbcore_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | return 0; |
| 925 | } |
| 926 | |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 927 | retval = ksuspend_usb_init(); |
| 928 | if (retval) |
| 929 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | retval = bus_register(&usb_bus_type); |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 931 | if (retval) |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 932 | goto bus_register_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | retval = usb_host_init(); |
| 934 | if (retval) |
| 935 | goto host_init_failed; |
| 936 | retval = usb_major_init(); |
| 937 | if (retval) |
| 938 | goto major_init_failed; |
Kay Sievers | fbf82fd | 2005-07-31 01:05:53 +0200 | [diff] [blame] | 939 | retval = usb_register(&usbfs_driver); |
| 940 | if (retval) |
| 941 | goto driver_register_failed; |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 942 | retval = usb_devio_init(); |
Kay Sievers | fbf82fd | 2005-07-31 01:05:53 +0200 | [diff] [blame] | 943 | if (retval) |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 944 | goto usb_devio_init_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | retval = usbfs_init(); |
| 946 | if (retval) |
| 947 | goto fs_init_failed; |
| 948 | retval = usb_hub_init(); |
| 949 | if (retval) |
| 950 | goto hub_init_failed; |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 951 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | if (!retval) |
| 953 | goto out; |
| 954 | |
| 955 | usb_hub_cleanup(); |
| 956 | hub_init_failed: |
| 957 | usbfs_cleanup(); |
| 958 | fs_init_failed: |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 959 | usb_devio_cleanup(); |
| 960 | usb_devio_init_failed: |
Kay Sievers | fbf82fd | 2005-07-31 01:05:53 +0200 | [diff] [blame] | 961 | usb_deregister(&usbfs_driver); |
| 962 | driver_register_failed: |
| 963 | usb_major_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | major_init_failed: |
| 965 | usb_host_cleanup(); |
| 966 | host_init_failed: |
| 967 | bus_unregister(&usb_bus_type); |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 968 | bus_register_failed: |
| 969 | ksuspend_usb_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | out: |
| 971 | return retval; |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * Cleanup |
| 976 | */ |
| 977 | static void __exit usb_exit(void) |
| 978 | { |
| 979 | /* This will matter if shutdown/reboot does exitcalls. */ |
| 980 | if (nousb) |
| 981 | return; |
| 982 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 983 | usb_deregister_device_driver(&usb_generic_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | usb_major_cleanup(); |
| 985 | usbfs_cleanup(); |
Kay Sievers | fbf82fd | 2005-07-31 01:05:53 +0200 | [diff] [blame] | 986 | usb_deregister(&usbfs_driver); |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 987 | usb_devio_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | usb_hub_cleanup(); |
| 989 | usb_host_cleanup(); |
| 990 | bus_unregister(&usb_bus_type); |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 991 | ksuspend_usb_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | subsys_initcall(usb_init); |
| 995 | module_exit(usb_exit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | MODULE_LICENSE("GPL"); |