Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 1 | /* |
| 2 | * drivers/usb/driver.c - most of the driver model stuff for usb |
| 3 | * |
| 4 | * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> |
| 5 | * |
| 6 | * based on drivers/usb/usb.c which had the following copyrights: |
| 7 | * (C) Copyright Linus Torvalds 1999 |
| 8 | * (C) Copyright Johannes Erdfelt 1999-2001 |
| 9 | * (C) Copyright Andreas Gal 1999 |
| 10 | * (C) Copyright Gregory P. Smith 1999 |
| 11 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| 12 | * (C) Copyright Randy Dunlap 2000 |
| 13 | * (C) Copyright David Brownell 2000-2004 |
| 14 | * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| 15 | * (usb_device_id matching changes by Adam J. Richter) |
| 16 | * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| 17 | * |
| 18 | * NOTE! This is not actually a driver at all, rather this is |
| 19 | * just a collection of helper routines that implement the |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 20 | * matching, probing, releasing, suspending and resuming for |
| 21 | * real drivers. |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 22 | * |
| 23 | */ |
| 24 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 25 | #include <linux/device.h> |
| 26 | #include <linux/usb.h> |
Alan Stern | 6bc6cff | 2007-05-04 11:53:03 -0400 | [diff] [blame] | 27 | #include <linux/usb/quirks.h> |
Alan Stern | bd85928 | 2006-09-19 10:14:07 -0400 | [diff] [blame] | 28 | #include <linux/workqueue.h> |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 29 | #include "hcd.h" |
| 30 | #include "usb.h" |
| 31 | |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 32 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 33 | #ifdef CONFIG_HOTPLUG |
| 34 | |
| 35 | /* |
| 36 | * Adds a new dynamic USBdevice ID to this driver, |
| 37 | * and cause the driver to probe for all devices again. |
| 38 | */ |
Greg Kroah-Hartman | 93bacef | 2006-12-17 21:50:23 +0100 | [diff] [blame] | 39 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
| 40 | struct device_driver *driver, |
| 41 | const char *buf, size_t count) |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 42 | { |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 43 | struct usb_dynid *dynid; |
| 44 | u32 idVendor = 0; |
| 45 | u32 idProduct = 0; |
| 46 | int fields = 0; |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 47 | int retval = 0; |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 48 | |
| 49 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); |
| 50 | if (fields < 2) |
| 51 | return -EINVAL; |
| 52 | |
| 53 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
| 54 | if (!dynid) |
| 55 | return -ENOMEM; |
| 56 | |
| 57 | INIT_LIST_HEAD(&dynid->node); |
| 58 | dynid->id.idVendor = idVendor; |
| 59 | dynid->id.idProduct = idProduct; |
| 60 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; |
| 61 | |
Greg Kroah-Hartman | 93bacef | 2006-12-17 21:50:23 +0100 | [diff] [blame] | 62 | spin_lock(&dynids->lock); |
Nathael Pajani | e5dd011 | 2007-09-04 11:46:23 +0200 | [diff] [blame] | 63 | list_add_tail(&dynid->node, &dynids->list); |
Greg Kroah-Hartman | 93bacef | 2006-12-17 21:50:23 +0100 | [diff] [blame] | 64 | spin_unlock(&dynids->lock); |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 65 | |
| 66 | if (get_driver(driver)) { |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 67 | retval = driver_attach(driver); |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 68 | put_driver(driver); |
| 69 | } |
| 70 | |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 71 | if (retval) |
| 72 | return retval; |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 73 | return count; |
| 74 | } |
Greg Kroah-Hartman | 93bacef | 2006-12-17 21:50:23 +0100 | [diff] [blame] | 75 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
| 76 | |
| 77 | static ssize_t store_new_id(struct device_driver *driver, |
| 78 | const char *buf, size_t count) |
| 79 | { |
| 80 | struct usb_driver *usb_drv = to_usb_driver(driver); |
| 81 | |
| 82 | return usb_store_new_id(&usb_drv->dynids, driver, buf, count); |
| 83 | } |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 84 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
| 85 | |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 86 | /** |
| 87 | * store_remove_id - remove a USB device ID from this driver |
| 88 | * @driver: target device driver |
| 89 | * @buf: buffer for scanning device ID data |
| 90 | * @count: input size |
| 91 | * |
| 92 | * Removes a dynamic usb device ID from this driver. |
| 93 | */ |
| 94 | static ssize_t |
| 95 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) |
| 96 | { |
| 97 | struct usb_dynid *dynid, *n; |
| 98 | struct usb_driver *usb_driver = to_usb_driver(driver); |
| 99 | u32 idVendor = 0; |
| 100 | u32 idProduct = 0; |
| 101 | int fields = 0; |
| 102 | int retval = 0; |
| 103 | |
| 104 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); |
| 105 | if (fields < 2) |
| 106 | return -EINVAL; |
| 107 | |
| 108 | spin_lock(&usb_driver->dynids.lock); |
| 109 | list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { |
| 110 | struct usb_device_id *id = &dynid->id; |
| 111 | if ((id->idVendor == idVendor) && |
| 112 | (id->idProduct == idProduct)) { |
| 113 | list_del(&dynid->node); |
| 114 | kfree(dynid); |
| 115 | retval = 0; |
| 116 | break; |
| 117 | } |
| 118 | } |
| 119 | spin_unlock(&usb_driver->dynids.lock); |
| 120 | |
| 121 | if (retval) |
| 122 | return retval; |
| 123 | return count; |
| 124 | } |
| 125 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
| 126 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 127 | static int usb_create_newid_file(struct usb_driver *usb_drv) |
| 128 | { |
| 129 | int error = 0; |
| 130 | |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 131 | if (usb_drv->no_dynamic_id) |
| 132 | goto exit; |
| 133 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 134 | if (usb_drv->probe != NULL) |
Greg Kroah-Hartman | 15147ff | 2007-11-28 12:23:18 -0800 | [diff] [blame] | 135 | error = driver_create_file(&usb_drv->drvwrap.driver, |
| 136 | &driver_attr_new_id); |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 137 | exit: |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 138 | return error; |
| 139 | } |
| 140 | |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 141 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
| 142 | { |
| 143 | if (usb_drv->no_dynamic_id) |
| 144 | return; |
| 145 | |
| 146 | if (usb_drv->probe != NULL) |
Greg Kroah-Hartman | 15147ff | 2007-11-28 12:23:18 -0800 | [diff] [blame] | 147 | driver_remove_file(&usb_drv->drvwrap.driver, |
| 148 | &driver_attr_new_id); |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 149 | } |
| 150 | |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 151 | static int |
| 152 | usb_create_removeid_file(struct usb_driver *drv) |
| 153 | { |
| 154 | int error = 0; |
| 155 | if (drv->probe != NULL) |
| 156 | error = driver_create_file(&drv->drvwrap.driver, |
| 157 | &driver_attr_remove_id); |
| 158 | return error; |
| 159 | } |
| 160 | |
| 161 | static void usb_remove_removeid_file(struct usb_driver *drv) |
| 162 | { |
| 163 | driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id); |
| 164 | } |
| 165 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 166 | static void usb_free_dynids(struct usb_driver *usb_drv) |
| 167 | { |
| 168 | struct usb_dynid *dynid, *n; |
| 169 | |
| 170 | spin_lock(&usb_drv->dynids.lock); |
| 171 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { |
| 172 | list_del(&dynid->node); |
| 173 | kfree(dynid); |
| 174 | } |
| 175 | spin_unlock(&usb_drv->dynids.lock); |
| 176 | } |
| 177 | #else |
| 178 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) |
| 179 | { |
| 180 | return 0; |
| 181 | } |
| 182 | |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 183 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
| 184 | { |
| 185 | } |
| 186 | |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 187 | static int |
| 188 | usb_create_removeid_file(struct usb_driver *drv) |
| 189 | { |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static void usb_remove_removeid_file(struct usb_driver *drv) |
| 194 | { |
| 195 | } |
| 196 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 197 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
| 198 | { |
| 199 | } |
| 200 | #endif |
| 201 | |
| 202 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, |
| 203 | struct usb_driver *drv) |
| 204 | { |
| 205 | struct usb_dynid *dynid; |
| 206 | |
| 207 | spin_lock(&drv->dynids.lock); |
| 208 | list_for_each_entry(dynid, &drv->dynids.list, node) { |
| 209 | if (usb_match_one_id(intf, &dynid->id)) { |
| 210 | spin_unlock(&drv->dynids.lock); |
| 211 | return &dynid->id; |
| 212 | } |
| 213 | } |
| 214 | spin_unlock(&drv->dynids.lock); |
| 215 | return NULL; |
| 216 | } |
| 217 | |
| 218 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 219 | /* called from driver core with dev locked */ |
| 220 | static int usb_probe_device(struct device *dev) |
| 221 | { |
| 222 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 223 | struct usb_device *udev = to_usb_device(dev); |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 224 | int error = -ENODEV; |
| 225 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 226 | dev_dbg(dev, "%s\n", __func__); |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 227 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 228 | /* TODO: Add real matching code */ |
| 229 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 230 | /* The device should always appear to be in use |
| 231 | * unless the driver suports autosuspend. |
| 232 | */ |
| 233 | udev->pm_usage_cnt = !(udriver->supports_autosuspend); |
| 234 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 235 | error = udriver->probe(udev); |
| 236 | return error; |
| 237 | } |
| 238 | |
| 239 | /* called from driver core with dev locked */ |
| 240 | static int usb_unbind_device(struct device *dev) |
| 241 | { |
| 242 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
| 243 | |
| 244 | udriver->disconnect(to_usb_device(dev)); |
| 245 | return 0; |
| 246 | } |
| 247 | |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 248 | /* |
| 249 | * Cancel any pending scheduled resets |
| 250 | * |
| 251 | * [see usb_queue_reset_device()] |
| 252 | * |
| 253 | * Called after unconfiguring / when releasing interfaces. See |
| 254 | * comments in __usb_queue_reset_device() regarding |
| 255 | * udev->reset_running. |
| 256 | */ |
| 257 | static void usb_cancel_queued_reset(struct usb_interface *iface) |
| 258 | { |
| 259 | if (iface->reset_running == 0) |
| 260 | cancel_work_sync(&iface->reset_ws); |
| 261 | } |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 262 | |
| 263 | /* called from driver core with dev locked */ |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 264 | static int usb_probe_interface(struct device *dev) |
| 265 | { |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 266 | struct usb_driver *driver = to_usb_driver(dev->driver); |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 267 | struct usb_interface *intf = to_usb_interface(dev); |
| 268 | struct usb_device *udev = interface_to_usbdev(intf); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 269 | const struct usb_device_id *id; |
| 270 | int error = -ENODEV; |
| 271 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 272 | dev_dbg(dev, "%s\n", __func__); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 273 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 274 | intf->needs_binding = 0; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 275 | |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 276 | if (usb_device_is_owned(udev)) |
| 277 | return -ENODEV; |
| 278 | |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 279 | if (udev->authorized == 0) { |
| 280 | dev_err(&intf->dev, "Device is not authorized for usage\n"); |
| 281 | return -ENODEV; |
| 282 | } |
Inaky Perez-Gonzalez | 72230ab | 2007-07-31 20:34:03 -0700 | [diff] [blame] | 283 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 284 | id = usb_match_id(intf, driver->id_table); |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 285 | if (!id) |
| 286 | id = usb_match_dynamic_id(intf, driver); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 287 | if (id) { |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 288 | dev_dbg(dev, "%s - got id\n", __func__); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 289 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 290 | error = usb_autoresume_device(udev); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 291 | if (error) |
| 292 | return error; |
| 293 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 294 | /* Interface "power state" doesn't correspond to any hardware |
| 295 | * state whatsoever. We use it to record when it's bound to |
| 296 | * a driver that may start I/0: it's not frozen/quiesced. |
| 297 | */ |
| 298 | mark_active(intf); |
| 299 | intf->condition = USB_INTERFACE_BINDING; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 300 | |
| 301 | /* The interface should always appear to be in use |
| 302 | * unless the driver suports autosuspend. |
| 303 | */ |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 304 | atomic_set(&intf->pm_usage_cnt, !driver->supports_autosuspend); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 305 | |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 306 | /* Carry out a deferred switch to altsetting 0 */ |
| 307 | if (intf->needs_altsetting0) { |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 308 | error = usb_set_interface(udev, intf->altsetting[0]. |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 309 | desc.bInterfaceNumber, 0); |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 310 | if (error < 0) |
| 311 | goto err; |
| 312 | |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 313 | intf->needs_altsetting0 = 0; |
| 314 | } |
| 315 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 316 | error = driver->probe(intf, id); |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 317 | if (error) |
| 318 | goto err; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 319 | |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 320 | intf->condition = USB_INTERFACE_BOUND; |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 321 | usb_autosuspend_device(udev); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | return error; |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 325 | |
| 326 | err: |
| 327 | mark_quiesced(intf); |
| 328 | intf->needs_remote_wakeup = 0; |
| 329 | intf->condition = USB_INTERFACE_UNBOUND; |
| 330 | usb_cancel_queued_reset(intf); |
| 331 | usb_autosuspend_device(udev); |
| 332 | return error; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 333 | } |
| 334 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 335 | /* called from driver core with dev locked */ |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 336 | static int usb_unbind_interface(struct device *dev) |
| 337 | { |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 338 | struct usb_driver *driver = to_usb_driver(dev->driver); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 339 | struct usb_interface *intf = to_usb_interface(dev); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 340 | struct usb_device *udev; |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 341 | int error, r; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 342 | |
| 343 | intf->condition = USB_INTERFACE_UNBINDING; |
| 344 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 345 | /* Autoresume for set_interface call below */ |
| 346 | udev = interface_to_usbdev(intf); |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 347 | error = usb_autoresume_device(udev); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 348 | |
Alan Stern | 9da82bd | 2008-05-08 11:54:37 -0400 | [diff] [blame] | 349 | /* Terminate all URBs for this interface unless the driver |
| 350 | * supports "soft" unbinding. |
| 351 | */ |
| 352 | if (!driver->soft_unbind) |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 353 | usb_disable_interface(udev, intf, false); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 354 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 355 | driver->disconnect(intf); |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 356 | usb_cancel_queued_reset(intf); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 357 | |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 358 | /* Reset other interface state. |
| 359 | * We cannot do a Set-Interface if the device is suspended or |
| 360 | * if it is prepared for a system sleep (since installing a new |
| 361 | * altsetting means creating new endpoint device entries). |
| 362 | * When either of these happens, defer the Set-Interface. |
| 363 | */ |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 364 | if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
| 365 | /* Already in altsetting 0 so skip Set-Interface. |
| 366 | * Just re-enable it without affecting the endpoint toggles. |
| 367 | */ |
| 368 | usb_enable_interface(udev, intf, false); |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 369 | } else if (!error && intf->dev.power.status == DPM_ON) { |
| 370 | r = usb_set_interface(udev, intf->altsetting[0]. |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 371 | desc.bInterfaceNumber, 0); |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 372 | if (r < 0) |
| 373 | intf->needs_altsetting0 = 1; |
| 374 | } else { |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 375 | intf->needs_altsetting0 = 1; |
Oliver Neukum | 1e5ea5e | 2009-08-27 16:46:56 +0200 | [diff] [blame] | 376 | } |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 377 | usb_set_intfdata(intf, NULL); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 378 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 379 | intf->condition = USB_INTERFACE_UNBOUND; |
| 380 | mark_quiesced(intf); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 381 | intf->needs_remote_wakeup = 0; |
| 382 | |
| 383 | if (!error) |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 384 | usb_autosuspend_device(udev); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 385 | |
| 386 | return 0; |
| 387 | } |
| 388 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 389 | /** |
| 390 | * usb_driver_claim_interface - bind a driver to an interface |
| 391 | * @driver: the driver to be bound |
| 392 | * @iface: the interface to which it will be bound; must be in the |
| 393 | * usb device's active configuration |
| 394 | * @priv: driver data associated with that interface |
| 395 | * |
| 396 | * This is used by usb device drivers that need to claim more than one |
| 397 | * interface on a device when probing (audio and acm are current examples). |
| 398 | * No device driver should directly modify internal usb_interface or |
| 399 | * usb_device structure members. |
| 400 | * |
| 401 | * Few drivers should need to use this routine, since the most natural |
| 402 | * way to bind to an interface is to return the private data from |
| 403 | * the driver's probe() method. |
| 404 | * |
Greg Kroah-Hartman | 341487a | 2007-04-09 11:52:31 -0400 | [diff] [blame] | 405 | * Callers must own the device lock, so driver probe() entries don't need |
| 406 | * extra locking, but other call contexts may need to explicitly claim that |
| 407 | * lock. |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 408 | */ |
| 409 | int usb_driver_claim_interface(struct usb_driver *driver, |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 410 | struct usb_interface *iface, void *priv) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 411 | { |
| 412 | struct device *dev = &iface->dev; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 413 | struct usb_device *udev = interface_to_usbdev(iface); |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 414 | int retval = 0; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 415 | |
| 416 | if (dev->driver) |
| 417 | return -EBUSY; |
| 418 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 419 | dev->driver = &driver->drvwrap.driver; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 420 | usb_set_intfdata(iface, priv); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 421 | iface->needs_binding = 0; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 422 | |
Alan Stern | e0318eb | 2006-09-26 14:50:20 -0400 | [diff] [blame] | 423 | usb_pm_lock(udev); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 424 | iface->condition = USB_INTERFACE_BOUND; |
| 425 | mark_active(iface); |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 426 | atomic_set(&iface->pm_usage_cnt, !driver->supports_autosuspend); |
Alan Stern | e0318eb | 2006-09-26 14:50:20 -0400 | [diff] [blame] | 427 | usb_pm_unlock(udev); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 428 | |
| 429 | /* if interface was already added, bind now; else let |
| 430 | * the future device_add() bind it, bypassing probe() |
| 431 | */ |
| 432 | if (device_is_registered(dev)) |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 433 | retval = device_bind_driver(dev); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 434 | |
Greg Kroah-Hartman | 1b21d5e | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 435 | return retval; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 436 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 437 | EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 438 | |
| 439 | /** |
| 440 | * usb_driver_release_interface - unbind a driver from an interface |
| 441 | * @driver: the driver to be unbound |
| 442 | * @iface: the interface from which it will be unbound |
| 443 | * |
| 444 | * This can be used by drivers to release an interface without waiting |
| 445 | * for their disconnect() methods to be called. In typical cases this |
| 446 | * also causes the driver disconnect() method to be called. |
| 447 | * |
| 448 | * This call is synchronous, and may not be used in an interrupt context. |
Greg Kroah-Hartman | 341487a | 2007-04-09 11:52:31 -0400 | [diff] [blame] | 449 | * Callers must own the device lock, so driver disconnect() entries don't |
| 450 | * need extra locking, but other call contexts may need to explicitly claim |
| 451 | * that lock. |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 452 | */ |
| 453 | void usb_driver_release_interface(struct usb_driver *driver, |
| 454 | struct usb_interface *iface) |
| 455 | { |
| 456 | struct device *dev = &iface->dev; |
| 457 | |
| 458 | /* this should never happen, don't release something that's not ours */ |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 459 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 460 | return; |
| 461 | |
| 462 | /* don't release from within disconnect() */ |
| 463 | if (iface->condition != USB_INTERFACE_BOUND) |
| 464 | return; |
Alan Stern | 91f8d06 | 2009-04-16 15:35:09 -0400 | [diff] [blame] | 465 | iface->condition = USB_INTERFACE_UNBINDING; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 466 | |
Alan Stern | 91f8d06 | 2009-04-16 15:35:09 -0400 | [diff] [blame] | 467 | /* Release via the driver core only if the interface |
| 468 | * has already been registered |
| 469 | */ |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 470 | if (device_is_registered(dev)) { |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 471 | device_release_driver(dev); |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 472 | } else { |
Alan Stern | 91f8d06 | 2009-04-16 15:35:09 -0400 | [diff] [blame] | 473 | down(&dev->sem); |
| 474 | usb_unbind_interface(dev); |
| 475 | dev->driver = NULL; |
| 476 | up(&dev->sem); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 477 | } |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 478 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 479 | EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 480 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 481 | /* returns 0 if no match, 1 if match */ |
Greg Kroah-Hartman | bb41702 | 2007-01-26 14:26:21 +0100 | [diff] [blame] | 482 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 483 | { |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 484 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
| 485 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) |
| 486 | return 0; |
| 487 | |
| 488 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && |
| 489 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) |
| 490 | return 0; |
| 491 | |
| 492 | /* No need to test id->bcdDevice_lo != 0, since 0 is never |
| 493 | greater than any unsigned number. */ |
| 494 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && |
| 495 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) |
| 496 | return 0; |
| 497 | |
| 498 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && |
| 499 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) |
| 500 | return 0; |
| 501 | |
| 502 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && |
| 503 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) |
| 504 | return 0; |
| 505 | |
| 506 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 507 | (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 508 | return 0; |
| 509 | |
| 510 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && |
| 511 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) |
| 512 | return 0; |
| 513 | |
Greg Kroah-Hartman | bb41702 | 2007-01-26 14:26:21 +0100 | [diff] [blame] | 514 | return 1; |
| 515 | } |
| 516 | |
| 517 | /* returns 0 if no match, 1 if match */ |
| 518 | int usb_match_one_id(struct usb_interface *interface, |
| 519 | const struct usb_device_id *id) |
| 520 | { |
| 521 | struct usb_host_interface *intf; |
| 522 | struct usb_device *dev; |
| 523 | |
| 524 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
| 525 | if (id == NULL) |
| 526 | return 0; |
| 527 | |
| 528 | intf = interface->cur_altsetting; |
| 529 | dev = interface_to_usbdev(interface); |
| 530 | |
| 531 | if (!usb_match_device(dev, id)) |
| 532 | return 0; |
| 533 | |
Alan Stern | 93c8bf4 | 2006-10-18 16:41:51 -0400 | [diff] [blame] | 534 | /* The interface class, subclass, and protocol should never be |
| 535 | * checked for a match if the device class is Vendor Specific, |
| 536 | * unless the match record specifies the Vendor ID. */ |
| 537 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && |
| 538 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
| 539 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | |
| 540 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | |
| 541 | USB_DEVICE_ID_MATCH_INT_PROTOCOL))) |
| 542 | return 0; |
| 543 | |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 544 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
| 545 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) |
| 546 | return 0; |
| 547 | |
| 548 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && |
| 549 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) |
| 550 | return 0; |
| 551 | |
| 552 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && |
| 553 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) |
| 554 | return 0; |
| 555 | |
| 556 | return 1; |
| 557 | } |
Greg Kroah-Hartman | 93bacef | 2006-12-17 21:50:23 +0100 | [diff] [blame] | 558 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
| 559 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 560 | /** |
| 561 | * usb_match_id - find first usb_device_id matching device or interface |
| 562 | * @interface: the interface of interest |
| 563 | * @id: array of usb_device_id structures, terminated by zero entry |
| 564 | * |
| 565 | * usb_match_id searches an array of usb_device_id's and returns |
| 566 | * the first one matching the device or interface, or null. |
| 567 | * This is used when binding (or rebinding) a driver to an interface. |
| 568 | * Most USB device drivers will use this indirectly, through the usb core, |
| 569 | * but some layered driver frameworks use it directly. |
| 570 | * These device tables are exported with MODULE_DEVICE_TABLE, through |
| 571 | * modutils, to support the driver loading functionality of USB hotplugging. |
| 572 | * |
| 573 | * What Matches: |
| 574 | * |
| 575 | * The "match_flags" element in a usb_device_id controls which |
| 576 | * members are used. If the corresponding bit is set, the |
| 577 | * value in the device_id must match its corresponding member |
| 578 | * in the device or interface descriptor, or else the device_id |
| 579 | * does not match. |
| 580 | * |
| 581 | * "driver_info" is normally used only by device drivers, |
| 582 | * but you can create a wildcard "matches anything" usb_device_id |
| 583 | * as a driver's "modules.usbmap" entry if you provide an id with |
| 584 | * only a nonzero "driver_info" field. If you do this, the USB device |
| 585 | * driver's probe() routine should use additional intelligence to |
| 586 | * decide whether to bind to the specified interface. |
| 587 | * |
| 588 | * What Makes Good usb_device_id Tables: |
| 589 | * |
| 590 | * The match algorithm is very simple, so that intelligence in |
| 591 | * driver selection must come from smart driver id records. |
| 592 | * Unless you have good reasons to use another selection policy, |
| 593 | * provide match elements only in related groups, and order match |
| 594 | * specifiers from specific to general. Use the macros provided |
| 595 | * for that purpose if you can. |
| 596 | * |
| 597 | * The most specific match specifiers use device descriptor |
| 598 | * data. These are commonly used with product-specific matches; |
| 599 | * the USB_DEVICE macro lets you provide vendor and product IDs, |
| 600 | * and you can also match against ranges of product revisions. |
| 601 | * These are widely used for devices with application or vendor |
| 602 | * specific bDeviceClass values. |
| 603 | * |
| 604 | * Matches based on device class/subclass/protocol specifications |
| 605 | * are slightly more general; use the USB_DEVICE_INFO macro, or |
| 606 | * its siblings. These are used with single-function devices |
| 607 | * where bDeviceClass doesn't specify that each interface has |
| 608 | * its own class. |
| 609 | * |
| 610 | * Matches based on interface class/subclass/protocol are the |
| 611 | * most general; they let drivers bind to any interface on a |
| 612 | * multiple-function device. Use the USB_INTERFACE_INFO |
| 613 | * macro, or its siblings, to match class-per-interface style |
Alan Stern | 93c8bf4 | 2006-10-18 16:41:51 -0400 | [diff] [blame] | 614 | * devices (as recorded in bInterfaceClass). |
| 615 | * |
| 616 | * Note that an entry created by USB_INTERFACE_INFO won't match |
| 617 | * any interface if the device class is set to Vendor-Specific. |
| 618 | * This is deliberate; according to the USB spec the meanings of |
| 619 | * the interface class/subclass/protocol for these devices are also |
| 620 | * vendor-specific, and hence matching against a standard product |
| 621 | * class wouldn't work anyway. If you really want to use an |
| 622 | * interface-based match for such a device, create a match record |
| 623 | * that also specifies the vendor ID. (Unforunately there isn't a |
| 624 | * standard macro for creating records like this.) |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 625 | * |
| 626 | * Within those groups, remember that not all combinations are |
| 627 | * meaningful. For example, don't give a product version range |
| 628 | * without vendor and product IDs; or specify a protocol without |
| 629 | * its associated class and subclass. |
| 630 | */ |
| 631 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, |
| 632 | const struct usb_device_id *id) |
| 633 | { |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 634 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
| 635 | if (id == NULL) |
| 636 | return NULL; |
| 637 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 638 | /* It is important to check that id->driver_info is nonzero, |
| 639 | since an entry that is all zeroes except for a nonzero |
| 640 | id->driver_info is the way to create an entry that |
| 641 | indicates that the driver want to examine every |
| 642 | device and interface. */ |
Greg Kroah-Hartman | de6f92b | 2008-01-28 09:50:12 -0800 | [diff] [blame] | 643 | for (; id->idVendor || id->idProduct || id->bDeviceClass || |
| 644 | id->bInterfaceClass || id->driver_info; id++) { |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 645 | if (usb_match_one_id(interface, id)) |
| 646 | return id; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | return NULL; |
| 650 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 651 | EXPORT_SYMBOL_GPL(usb_match_id); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 652 | |
Adrian Bunk | 8bb22d2 | 2006-11-21 22:02:54 +0100 | [diff] [blame] | 653 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 654 | { |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 655 | /* devices and interfaces are handled separately */ |
| 656 | if (is_usb_device(dev)) { |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 657 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 658 | /* interface drivers never match devices */ |
| 659 | if (!is_usb_device_driver(drv)) |
| 660 | return 0; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 661 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 662 | /* TODO: Add real matching code */ |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 663 | return 1; |
| 664 | |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 665 | } else if (is_usb_interface(dev)) { |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 666 | struct usb_interface *intf; |
| 667 | struct usb_driver *usb_drv; |
| 668 | const struct usb_device_id *id; |
| 669 | |
| 670 | /* device drivers never match interfaces */ |
| 671 | if (is_usb_device_driver(drv)) |
| 672 | return 0; |
| 673 | |
| 674 | intf = to_usb_interface(dev); |
| 675 | usb_drv = to_usb_driver(drv); |
| 676 | |
| 677 | id = usb_match_id(intf, usb_drv->id_table); |
| 678 | if (id) |
| 679 | return 1; |
| 680 | |
| 681 | id = usb_match_dynamic_id(intf, usb_drv); |
| 682 | if (id) |
| 683 | return 1; |
| 684 | } |
| 685 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 686 | return 0; |
| 687 | } |
| 688 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 689 | #ifdef CONFIG_HOTPLUG |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 690 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 691 | { |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 692 | struct usb_device *usb_dev; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 693 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 694 | /* driver is often null here; dev_dbg() would oops */ |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 695 | pr_debug("usb %s: uevent\n", dev_name(dev)); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 696 | |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 697 | if (is_usb_device(dev)) { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 698 | usb_dev = to_usb_device(dev); |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 699 | } else if (is_usb_interface(dev)) { |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 700 | struct usb_interface *intf = to_usb_interface(dev); |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 701 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 702 | usb_dev = interface_to_usbdev(intf); |
Kay Sievers | 5512966 | 2009-05-04 19:48:32 +0200 | [diff] [blame] | 703 | } else { |
| 704 | return 0; |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 705 | } |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 706 | |
| 707 | if (usb_dev->devnum < 0) { |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 708 | pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 709 | return -ENODEV; |
| 710 | } |
| 711 | if (!usb_dev->bus) { |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 712 | pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 713 | return -ENODEV; |
| 714 | } |
| 715 | |
| 716 | #ifdef CONFIG_USB_DEVICEFS |
| 717 | /* If this is available, userspace programs can directly read |
| 718 | * all the device descriptors we don't tell them about. Or |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 719 | * act as usermode drivers. |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 720 | */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 721 | if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d", |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 722 | usb_dev->bus->busnum, usb_dev->devnum)) |
| 723 | return -ENOMEM; |
| 724 | #endif |
| 725 | |
| 726 | /* per-device configurations are common */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 727 | if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 728 | le16_to_cpu(usb_dev->descriptor.idVendor), |
| 729 | le16_to_cpu(usb_dev->descriptor.idProduct), |
| 730 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) |
| 731 | return -ENOMEM; |
| 732 | |
| 733 | /* class-based driver binding models */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 734 | if (add_uevent_var(env, "TYPE=%d/%d/%d", |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 735 | usb_dev->descriptor.bDeviceClass, |
| 736 | usb_dev->descriptor.bDeviceSubClass, |
| 737 | usb_dev->descriptor.bDeviceProtocol)) |
| 738 | return -ENOMEM; |
| 739 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | #else |
| 744 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 745 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 746 | { |
| 747 | return -ENODEV; |
| 748 | } |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 749 | #endif /* CONFIG_HOTPLUG */ |
| 750 | |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 751 | /** |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 752 | * usb_register_device_driver - register a USB device (not interface) driver |
| 753 | * @new_udriver: USB operations for the device driver |
Greg Kroah-Hartman | 2143acc | 2005-11-21 14:53:03 -0800 | [diff] [blame] | 754 | * @owner: module owner of this driver. |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 755 | * |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 756 | * Registers a USB device driver with the USB core. The list of |
| 757 | * unattached devices will be rescanned whenever a new driver is |
| 758 | * added, allowing the new driver to attach to any recognized devices. |
| 759 | * Returns a negative error code on failure and 0 on success. |
| 760 | */ |
| 761 | int usb_register_device_driver(struct usb_device_driver *new_udriver, |
| 762 | struct module *owner) |
| 763 | { |
| 764 | int retval = 0; |
| 765 | |
| 766 | if (usb_disabled()) |
| 767 | return -ENODEV; |
| 768 | |
| 769 | new_udriver->drvwrap.for_devices = 1; |
| 770 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; |
| 771 | new_udriver->drvwrap.driver.bus = &usb_bus_type; |
| 772 | new_udriver->drvwrap.driver.probe = usb_probe_device; |
| 773 | new_udriver->drvwrap.driver.remove = usb_unbind_device; |
| 774 | new_udriver->drvwrap.driver.owner = owner; |
| 775 | |
| 776 | retval = driver_register(&new_udriver->drvwrap.driver); |
| 777 | |
| 778 | if (!retval) { |
| 779 | pr_info("%s: registered new device driver %s\n", |
| 780 | usbcore_name, new_udriver->name); |
| 781 | usbfs_update_special(); |
| 782 | } else { |
| 783 | printk(KERN_ERR "%s: error %d registering device " |
| 784 | " driver %s\n", |
| 785 | usbcore_name, retval, new_udriver->name); |
| 786 | } |
| 787 | |
| 788 | return retval; |
| 789 | } |
| 790 | EXPORT_SYMBOL_GPL(usb_register_device_driver); |
| 791 | |
| 792 | /** |
| 793 | * usb_deregister_device_driver - unregister a USB device (not interface) driver |
| 794 | * @udriver: USB operations of the device driver to unregister |
| 795 | * Context: must be able to sleep |
| 796 | * |
| 797 | * Unlinks the specified driver from the internal USB driver list. |
| 798 | */ |
| 799 | void usb_deregister_device_driver(struct usb_device_driver *udriver) |
| 800 | { |
| 801 | pr_info("%s: deregistering device driver %s\n", |
| 802 | usbcore_name, udriver->name); |
| 803 | |
| 804 | driver_unregister(&udriver->drvwrap.driver); |
| 805 | usbfs_update_special(); |
| 806 | } |
| 807 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); |
| 808 | |
| 809 | /** |
| 810 | * usb_register_driver - register a USB interface driver |
| 811 | * @new_driver: USB operations for the interface driver |
| 812 | * @owner: module owner of this driver. |
Randy Dunlap | 892705a | 2007-02-10 14:41:41 -0800 | [diff] [blame] | 813 | * @mod_name: module name string |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 814 | * |
| 815 | * Registers a USB interface driver with the USB core. The list of |
| 816 | * unattached interfaces will be rescanned whenever a new driver is |
| 817 | * added, allowing the new driver to attach to any recognized interfaces. |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 818 | * Returns a negative error code on failure and 0 on success. |
| 819 | * |
| 820 | * NOTE: if you want your driver to use the USB major number, you must call |
| 821 | * usb_register_dev() to enable that functionality. This function no longer |
| 822 | * takes care of that. |
| 823 | */ |
Greg Kroah-Hartman | 80f745f | 2007-01-15 11:50:02 -0800 | [diff] [blame] | 824 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
| 825 | const char *mod_name) |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 826 | { |
| 827 | int retval = 0; |
| 828 | |
| 829 | if (usb_disabled()) |
| 830 | return -ENODEV; |
| 831 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 832 | new_driver->drvwrap.for_devices = 0; |
| 833 | new_driver->drvwrap.driver.name = (char *) new_driver->name; |
| 834 | new_driver->drvwrap.driver.bus = &usb_bus_type; |
| 835 | new_driver->drvwrap.driver.probe = usb_probe_interface; |
| 836 | new_driver->drvwrap.driver.remove = usb_unbind_interface; |
| 837 | new_driver->drvwrap.driver.owner = owner; |
Greg Kroah-Hartman | 80f745f | 2007-01-15 11:50:02 -0800 | [diff] [blame] | 838 | new_driver->drvwrap.driver.mod_name = mod_name; |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 839 | spin_lock_init(&new_driver->dynids.lock); |
| 840 | INIT_LIST_HEAD(&new_driver->dynids.list); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 841 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 842 | retval = driver_register(&new_driver->drvwrap.driver); |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 843 | if (retval) |
| 844 | goto out; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 845 | |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 846 | usbfs_update_special(); |
| 847 | |
| 848 | retval = usb_create_newid_file(new_driver); |
| 849 | if (retval) |
| 850 | goto out_newid; |
| 851 | |
| 852 | retval = usb_create_removeid_file(new_driver); |
| 853 | if (retval) |
| 854 | goto out_removeid; |
| 855 | |
| 856 | pr_info("%s: registered new interface driver %s\n", |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 857 | usbcore_name, new_driver->name); |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 858 | |
| 859 | out: |
| 860 | return retval; |
| 861 | |
| 862 | out_removeid: |
| 863 | usb_remove_newid_file(new_driver); |
| 864 | out_newid: |
| 865 | driver_unregister(&new_driver->drvwrap.driver); |
| 866 | |
| 867 | printk(KERN_ERR "%s: error %d registering interface " |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 868 | " driver %s\n", |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 869 | usbcore_name, retval, new_driver->name); |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 870 | goto out; |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 871 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 872 | EXPORT_SYMBOL_GPL(usb_register_driver); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 873 | |
| 874 | /** |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 875 | * usb_deregister - unregister a USB interface driver |
| 876 | * @driver: USB operations of the interface driver to unregister |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 877 | * Context: must be able to sleep |
| 878 | * |
| 879 | * Unlinks the specified driver from the internal USB driver list. |
| 880 | * |
| 881 | * NOTE: If you called usb_register_dev(), you still need to call |
| 882 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, |
| 883 | * this * call will no longer do it for you. |
| 884 | */ |
| 885 | void usb_deregister(struct usb_driver *driver) |
| 886 | { |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 887 | pr_info("%s: deregistering interface driver %s\n", |
| 888 | usbcore_name, driver->name); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 889 | |
CHENG Renquan | 0c7a2b7 | 2009-11-22 01:28:52 +0800 | [diff] [blame] | 890 | usb_remove_removeid_file(driver); |
Greg Kroah-Hartman | ba9dc65 | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 891 | usb_remove_newid_file(driver); |
Greg Kroah-Hartman | 733260f | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 892 | usb_free_dynids(driver); |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 893 | driver_unregister(&driver->drvwrap.driver); |
Greg Kroah-Hartman | ddae41b | 2005-11-16 13:41:28 -0800 | [diff] [blame] | 894 | |
| 895 | usbfs_update_special(); |
| 896 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 897 | EXPORT_SYMBOL_GPL(usb_deregister); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 898 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 899 | /* Forced unbinding of a USB interface driver, either because |
| 900 | * it doesn't support pre_reset/post_reset/reset_resume or |
| 901 | * because it doesn't support suspend/resume. |
| 902 | * |
| 903 | * The caller must hold @intf's device's lock, but not its pm_mutex |
| 904 | * and not @intf->dev.sem. |
| 905 | */ |
| 906 | void usb_forced_unbind_intf(struct usb_interface *intf) |
| 907 | { |
| 908 | struct usb_driver *driver = to_usb_driver(intf->dev.driver); |
| 909 | |
| 910 | dev_dbg(&intf->dev, "forced unbind\n"); |
| 911 | usb_driver_release_interface(driver, intf); |
| 912 | |
| 913 | /* Mark the interface for later rebinding */ |
| 914 | intf->needs_binding = 1; |
| 915 | } |
| 916 | |
| 917 | /* Delayed forced unbinding of a USB interface driver and scan |
| 918 | * for rebinding. |
| 919 | * |
| 920 | * The caller must hold @intf's device's lock, but not its pm_mutex |
| 921 | * and not @intf->dev.sem. |
| 922 | * |
Alan Stern | 5096aed | 2008-08-12 14:34:14 -0400 | [diff] [blame] | 923 | * Note: Rebinds will be skipped if a system sleep transition is in |
| 924 | * progress and the PM "complete" callback hasn't occurred yet. |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 925 | */ |
| 926 | void usb_rebind_intf(struct usb_interface *intf) |
| 927 | { |
| 928 | int rc; |
| 929 | |
| 930 | /* Delayed unbind of an existing driver */ |
| 931 | if (intf->dev.driver) { |
| 932 | struct usb_driver *driver = |
| 933 | to_usb_driver(intf->dev.driver); |
| 934 | |
| 935 | dev_dbg(&intf->dev, "forced unbind\n"); |
| 936 | usb_driver_release_interface(driver, intf); |
| 937 | } |
| 938 | |
| 939 | /* Try to rebind the interface */ |
Alan Stern | 5096aed | 2008-08-12 14:34:14 -0400 | [diff] [blame] | 940 | if (intf->dev.power.status == DPM_ON) { |
| 941 | intf->needs_binding = 0; |
| 942 | rc = device_attach(&intf->dev); |
| 943 | if (rc < 0) |
| 944 | dev_warn(&intf->dev, "rebind failed: %d\n", rc); |
| 945 | } |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 946 | } |
| 947 | |
Alan Stern | 9ff7843 | 2008-08-07 13:04:51 -0400 | [diff] [blame] | 948 | #ifdef CONFIG_PM |
| 949 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 950 | #define DO_UNBIND 0 |
| 951 | #define DO_REBIND 1 |
| 952 | |
| 953 | /* Unbind drivers for @udev's interfaces that don't support suspend/resume, |
| 954 | * or rebind interfaces that have been unbound, according to @action. |
| 955 | * |
| 956 | * The caller must hold @udev's device lock. |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 957 | */ |
| 958 | static void do_unbind_rebind(struct usb_device *udev, int action) |
| 959 | { |
| 960 | struct usb_host_config *config; |
| 961 | int i; |
| 962 | struct usb_interface *intf; |
| 963 | struct usb_driver *drv; |
| 964 | |
| 965 | config = udev->actconfig; |
| 966 | if (config) { |
| 967 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
| 968 | intf = config->interface[i]; |
| 969 | switch (action) { |
| 970 | case DO_UNBIND: |
| 971 | if (intf->dev.driver) { |
| 972 | drv = to_usb_driver(intf->dev.driver); |
| 973 | if (!drv->suspend || !drv->resume) |
| 974 | usb_forced_unbind_intf(intf); |
| 975 | } |
| 976 | break; |
| 977 | case DO_REBIND: |
Alan Stern | 5096aed | 2008-08-12 14:34:14 -0400 | [diff] [blame] | 978 | if (intf->needs_binding) |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 979 | usb_rebind_intf(intf); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 980 | break; |
| 981 | } |
| 982 | } |
| 983 | } |
| 984 | } |
| 985 | |
Alan Stern | e0318eb | 2006-09-26 14:50:20 -0400 | [diff] [blame] | 986 | /* Caller has locked udev's pm_mutex */ |
Stephen Hemminger | d5ec168 | 2006-11-14 10:06:17 -0800 | [diff] [blame] | 987 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 988 | { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 989 | struct usb_device_driver *udriver; |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 990 | int status = 0; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 991 | |
Alan Stern | 114b368 | 2006-07-01 22:13:04 -0400 | [diff] [blame] | 992 | if (udev->state == USB_STATE_NOTATTACHED || |
| 993 | udev->state == USB_STATE_SUSPENDED) |
| 994 | goto done; |
| 995 | |
Alan Stern | b6f6436d | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 996 | /* For devices that don't have a driver, we do a generic suspend. */ |
| 997 | if (udev->dev.driver) |
| 998 | udriver = to_usb_device_driver(udev->dev.driver); |
| 999 | else { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1000 | udev->do_remote_wakeup = 0; |
Alan Stern | b6f6436d | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 1001 | udriver = &usb_generic_driver; |
Alan Stern | 1c5df7e | 2006-07-01 22:13:50 -0400 | [diff] [blame] | 1002 | } |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1003 | status = udriver->suspend(udev, msg); |
| 1004 | |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1005 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1006 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1007 | return status; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1008 | } |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1009 | |
Alan Stern | e0318eb | 2006-09-26 14:50:20 -0400 | [diff] [blame] | 1010 | /* Caller has locked udev's pm_mutex */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1011 | static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1012 | { |
| 1013 | struct usb_device_driver *udriver; |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1014 | int status = 0; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1015 | |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 1016 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1017 | goto done; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1018 | |
Alan Stern | 1c5df7e | 2006-07-01 22:13:50 -0400 | [diff] [blame] | 1019 | /* Can't resume it if it doesn't have a driver. */ |
| 1020 | if (udev->dev.driver == NULL) { |
| 1021 | status = -ENOTCONN; |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1022 | goto done; |
Alan Stern | 1c5df7e | 2006-07-01 22:13:50 -0400 | [diff] [blame] | 1023 | } |
| 1024 | |
Alan Stern | 6bc6cff | 2007-05-04 11:53:03 -0400 | [diff] [blame] | 1025 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
| 1026 | udev->reset_resume = 1; |
| 1027 | |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1028 | udriver = to_usb_device_driver(udev->dev.driver); |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1029 | status = udriver->resume(udev, msg); |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1030 | |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1031 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1032 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1033 | return status; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1034 | } |
| 1035 | |
Alan Stern | e0318eb | 2006-09-26 14:50:20 -0400 | [diff] [blame] | 1036 | /* Caller has locked intf's usb_device's pm mutex */ |
Alan Stern | 65605ae | 2008-08-12 14:33:27 -0400 | [diff] [blame] | 1037 | static int usb_suspend_interface(struct usb_device *udev, |
| 1038 | struct usb_interface *intf, pm_message_t msg) |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1039 | { |
| 1040 | struct usb_driver *driver; |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1041 | int status = 0; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1042 | |
Alan Stern | 114b368 | 2006-07-01 22:13:04 -0400 | [diff] [blame] | 1043 | /* with no hardware, USB interfaces only use FREEZE and ON states */ |
Alan Stern | 65605ae | 2008-08-12 14:33:27 -0400 | [diff] [blame] | 1044 | if (udev->state == USB_STATE_NOTATTACHED || !is_active(intf)) |
Alan Stern | 114b368 | 2006-07-01 22:13:04 -0400 | [diff] [blame] | 1045 | goto done; |
| 1046 | |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 1047 | /* This can happen; see usb_driver_release_interface() */ |
| 1048 | if (intf->condition == USB_INTERFACE_UNBOUND) |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1049 | goto done; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1050 | driver = to_usb_driver(intf->dev.driver); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1051 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1052 | if (driver->suspend) { |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1053 | status = driver->suspend(intf, msg); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1054 | if (status == 0) |
| 1055 | mark_quiesced(intf); |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1056 | else if (!(msg.event & PM_EVENT_AUTO)) |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1057 | dev_err(&intf->dev, "%s error %d\n", |
| 1058 | "suspend", status); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1059 | } else { |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1060 | /* Later we will unbind the driver and reprobe */ |
| 1061 | intf->needs_binding = 1; |
| 1062 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
| 1063 | "suspend", driver->name); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1064 | mark_quiesced(intf); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1065 | } |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1066 | |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1067 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1068 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1069 | return status; |
| 1070 | } |
| 1071 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1072 | /* Caller has locked intf's usb_device's pm_mutex */ |
Alan Stern | 65605ae | 2008-08-12 14:33:27 -0400 | [diff] [blame] | 1073 | static int usb_resume_interface(struct usb_device *udev, |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1074 | struct usb_interface *intf, pm_message_t msg, int reset_resume) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1075 | { |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1076 | struct usb_driver *driver; |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1077 | int status = 0; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1078 | |
Alan Stern | 65605ae | 2008-08-12 14:33:27 -0400 | [diff] [blame] | 1079 | if (udev->state == USB_STATE_NOTATTACHED || is_active(intf)) |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1080 | goto done; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1081 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1082 | /* Don't let autoresume interfere with unbinding */ |
| 1083 | if (intf->condition == USB_INTERFACE_UNBINDING) |
| 1084 | goto done; |
| 1085 | |
Alan Stern | 1c5df7e | 2006-07-01 22:13:50 -0400 | [diff] [blame] | 1086 | /* Can't resume it if it doesn't have a driver. */ |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 1087 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
| 1088 | |
| 1089 | /* Carry out a deferred switch to altsetting 0 */ |
| 1090 | if (intf->needs_altsetting0 && |
| 1091 | intf->dev.power.status == DPM_ON) { |
| 1092 | usb_set_interface(udev, intf->altsetting[0]. |
| 1093 | desc.bInterfaceNumber, 0); |
| 1094 | intf->needs_altsetting0 = 0; |
| 1095 | } |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1096 | goto done; |
Alan Stern | 55151d7 | 2008-08-12 14:33:59 -0400 | [diff] [blame] | 1097 | } |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1098 | |
| 1099 | /* Don't resume if the interface is marked for rebinding */ |
| 1100 | if (intf->needs_binding) |
| 1101 | goto done; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1102 | driver = to_usb_driver(intf->dev.driver); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1103 | |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1104 | if (reset_resume) { |
| 1105 | if (driver->reset_resume) { |
| 1106 | status = driver->reset_resume(intf); |
| 1107 | if (status) |
| 1108 | dev_err(&intf->dev, "%s error %d\n", |
| 1109 | "reset_resume", status); |
| 1110 | } else { |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1111 | intf->needs_binding = 1; |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1112 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
| 1113 | "reset_resume", driver->name); |
| 1114 | } |
| 1115 | } else { |
| 1116 | if (driver->resume) { |
| 1117 | status = driver->resume(intf); |
| 1118 | if (status) |
| 1119 | dev_err(&intf->dev, "%s error %d\n", |
| 1120 | "resume", status); |
| 1121 | } else { |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1122 | intf->needs_binding = 1; |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1123 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
| 1124 | "resume", driver->name); |
| 1125 | } |
| 1126 | } |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1127 | |
| 1128 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1129 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1130 | if (status == 0 && intf->condition == USB_INTERFACE_BOUND) |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 1131 | mark_active(intf); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1132 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1133 | /* Later we will unbind the driver and/or reprobe, if necessary */ |
Alan Stern | 2bf4086 | 2006-07-01 22:12:19 -0400 | [diff] [blame] | 1134 | return status; |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1135 | } |
| 1136 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1137 | #ifdef CONFIG_USB_SUSPEND |
| 1138 | |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1139 | /* Internal routine to check whether we may autosuspend a device. */ |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1140 | static int autosuspend_check(struct usb_device *udev, int reschedule) |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1141 | { |
| 1142 | int i; |
| 1143 | struct usb_interface *intf; |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1144 | unsigned long suspend_time, j; |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1145 | |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 1146 | /* For autosuspend, fail fast if anything is in use or autosuspend |
| 1147 | * is disabled. Also fail if any interfaces require remote wakeup |
| 1148 | * but it isn't available. |
| 1149 | */ |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1150 | if (udev->pm_usage_cnt > 0) |
| 1151 | return -EBUSY; |
Alan Stern | 2add522 | 2007-03-20 14:59:39 -0400 | [diff] [blame] | 1152 | if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled) |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 1153 | return -EPERM; |
| 1154 | |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1155 | suspend_time = udev->last_busy + udev->autosuspend_delay; |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1156 | if (udev->actconfig) { |
| 1157 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 1158 | intf = udev->actconfig->interface[i]; |
| 1159 | if (!is_active(intf)) |
| 1160 | continue; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1161 | if (atomic_read(&intf->pm_usage_cnt) > 0) |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1162 | return -EBUSY; |
| 1163 | if (intf->needs_remote_wakeup && |
| 1164 | !udev->do_remote_wakeup) { |
| 1165 | dev_dbg(&udev->dev, "remote wakeup needed " |
| 1166 | "for autosuspend\n"); |
| 1167 | return -EOPNOTSUPP; |
| 1168 | } |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1169 | |
| 1170 | /* Don't allow autosuspend if the device will need |
| 1171 | * a reset-resume and any of its interface drivers |
| 1172 | * doesn't include support. |
| 1173 | */ |
| 1174 | if (udev->quirks & USB_QUIRK_RESET_RESUME) { |
| 1175 | struct usb_driver *driver; |
| 1176 | |
| 1177 | driver = to_usb_driver(intf->dev.driver); |
Oliver Neukum | 399d31d | 2008-09-15 17:29:28 +0200 | [diff] [blame] | 1178 | if (!driver->reset_resume || |
| 1179 | intf->needs_remote_wakeup) |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1180 | return -EOPNOTSUPP; |
| 1181 | } |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1182 | } |
| 1183 | } |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1184 | |
| 1185 | /* If everything is okay but the device hasn't been idle for long |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1186 | * enough, queue a delayed autosuspend request. If the device |
| 1187 | * _has_ been idle for long enough and the reschedule flag is set, |
| 1188 | * likewise queue a delayed (1 second) autosuspend request. |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1189 | */ |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1190 | j = jiffies; |
| 1191 | if (time_before(j, suspend_time)) |
| 1192 | reschedule = 1; |
| 1193 | else |
| 1194 | suspend_time = j + HZ; |
| 1195 | if (reschedule) { |
Alan Stern | 8c9862e | 2007-04-11 12:06:16 -0400 | [diff] [blame] | 1196 | if (!timer_pending(&udev->autosuspend.timer)) { |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1197 | queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, |
Alan Stern | 4ec06d6 | 2008-11-25 16:40:02 -0500 | [diff] [blame] | 1198 | round_jiffies_up_relative(suspend_time - j)); |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1199 | } |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1200 | return -EAGAIN; |
| 1201 | } |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1202 | return 0; |
| 1203 | } |
| 1204 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1205 | #else |
| 1206 | |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1207 | static inline int autosuspend_check(struct usb_device *udev, int reschedule) |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1208 | { |
| 1209 | return 0; |
| 1210 | } |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1211 | |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 1212 | #endif /* CONFIG_USB_SUSPEND */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1213 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1214 | /** |
| 1215 | * usb_suspend_both - suspend a USB device and its interfaces |
| 1216 | * @udev: the usb_device to suspend |
| 1217 | * @msg: Power Management message describing this state transition |
| 1218 | * |
| 1219 | * This is the central routine for suspending USB devices. It calls the |
| 1220 | * suspend methods for all the interface drivers in @udev and then calls |
| 1221 | * the suspend method for @udev itself. If an error occurs at any stage, |
| 1222 | * all the interfaces which were suspended are resumed so that they remain |
| 1223 | * in the same state as the device. |
| 1224 | * |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1225 | * If an autosuspend is in progress the routine checks first to make sure |
| 1226 | * that neither the device itself or any of its active interfaces is in use |
| 1227 | * (pm_usage_cnt is greater than 0). If they are, the autosuspend fails. |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1228 | * |
| 1229 | * If the suspend succeeds, the routine recursively queues an autosuspend |
| 1230 | * request for @udev's parent device, thereby propagating the change up |
| 1231 | * the device tree. If all of the parent's children are now suspended, |
| 1232 | * the parent will autosuspend in turn. |
| 1233 | * |
| 1234 | * The suspend method calls are subject to mutual exclusion under control |
| 1235 | * of @udev's pm_mutex. Many of these calls are also under the protection |
| 1236 | * of @udev's device lock (including all requests originating outside the |
| 1237 | * USB subsystem), but autosuspend requests generated by a child device or |
| 1238 | * interface driver may not be. Usbcore will insure that the method calls |
| 1239 | * do not arrive during bind, unbind, or reset operations. However, drivers |
| 1240 | * must be prepared to handle suspend calls arriving at unpredictable times. |
| 1241 | * The only way to block such calls is to do an autoresume (preventing |
| 1242 | * autosuspends) while holding @udev's device lock (preventing outside |
| 1243 | * suspends). |
| 1244 | * |
| 1245 | * The caller must hold @udev->pm_mutex. |
| 1246 | * |
| 1247 | * This routine can run only in process context. |
| 1248 | */ |
Alan Stern | 718efa6 | 2007-03-09 15:41:13 -0500 | [diff] [blame] | 1249 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1250 | { |
| 1251 | int status = 0; |
| 1252 | int i = 0; |
| 1253 | struct usb_interface *intf; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1254 | struct usb_device *parent = udev->parent; |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1255 | |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1256 | if (udev->state == USB_STATE_NOTATTACHED || |
| 1257 | udev->state == USB_STATE_SUSPENDED) |
| 1258 | goto done; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1259 | |
| 1260 | udev->do_remote_wakeup = device_may_wakeup(&udev->dev); |
| 1261 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1262 | if (msg.event & PM_EVENT_AUTO) { |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1263 | status = autosuspend_check(udev, 0); |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1264 | if (status < 0) |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1265 | goto done; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1266 | } |
| 1267 | |
| 1268 | /* Suspend all the interfaces and then udev itself */ |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1269 | if (udev->actconfig) { |
| 1270 | for (; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 1271 | intf = udev->actconfig->interface[i]; |
Alan Stern | 65605ae | 2008-08-12 14:33:27 -0400 | [diff] [blame] | 1272 | status = usb_suspend_interface(udev, intf, msg); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1273 | if (status != 0) |
| 1274 | break; |
| 1275 | } |
| 1276 | } |
Alan Stern | 5ad4f71 | 2007-09-10 11:31:43 -0400 | [diff] [blame] | 1277 | if (status == 0) |
Stephen Hemminger | d5ec168 | 2006-11-14 10:06:17 -0800 | [diff] [blame] | 1278 | status = usb_suspend_device(udev, msg); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1279 | |
| 1280 | /* If the suspend failed, resume interfaces that did get suspended */ |
| 1281 | if (status != 0) { |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1282 | pm_message_t msg2; |
| 1283 | |
| 1284 | msg2.event = msg.event ^ (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1285 | while (--i >= 0) { |
| 1286 | intf = udev->actconfig->interface[i]; |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1287 | usb_resume_interface(udev, intf, msg2, 0); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1288 | } |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1289 | |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1290 | /* Try another autosuspend when the interfaces aren't busy */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1291 | if (msg.event & PM_EVENT_AUTO) |
Alan Stern | d1aa3e6 | 2007-10-11 16:47:36 -0400 | [diff] [blame] | 1292 | autosuspend_check(udev, status == -EBUSY); |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1293 | |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 1294 | /* If the suspend succeeded then prevent any more URB submissions, |
| 1295 | * flush any outstanding URBs, and propagate the suspend up the tree. |
| 1296 | */ |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1297 | } else { |
| 1298 | cancel_delayed_work(&udev->autosuspend); |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 1299 | udev->can_submit = 0; |
| 1300 | for (i = 0; i < 16; ++i) { |
| 1301 | usb_hcd_flush_endpoint(udev, udev->ep_out[i]); |
| 1302 | usb_hcd_flush_endpoint(udev, udev->ep_in[i]); |
| 1303 | } |
Alan Stern | 7108f28 | 2007-09-20 12:37:50 -0400 | [diff] [blame] | 1304 | |
| 1305 | /* If this is just a FREEZE or a PRETHAW, udev might |
| 1306 | * not really be suspended. Only true suspends get |
| 1307 | * propagated up the device tree. |
| 1308 | */ |
| 1309 | if (parent && udev->state == USB_STATE_SUSPENDED) |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1310 | usb_autosuspend_device(parent); |
| 1311 | } |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1312 | |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1313 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1314 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1315 | return status; |
| 1316 | } |
| 1317 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1318 | /** |
| 1319 | * usb_resume_both - resume a USB device and its interfaces |
| 1320 | * @udev: the usb_device to resume |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1321 | * @msg: Power Management message describing this state transition |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1322 | * |
| 1323 | * This is the central routine for resuming USB devices. It calls the |
| 1324 | * the resume method for @udev and then calls the resume methods for all |
| 1325 | * the interface drivers in @udev. |
| 1326 | * |
| 1327 | * Before starting the resume, the routine calls itself recursively for |
| 1328 | * the parent device of @udev, thereby propagating the change up the device |
| 1329 | * tree and assuring that @udev will be able to resume. If the parent is |
| 1330 | * unable to resume successfully, the routine fails. |
| 1331 | * |
| 1332 | * The resume method calls are subject to mutual exclusion under control |
| 1333 | * of @udev's pm_mutex. Many of these calls are also under the protection |
| 1334 | * of @udev's device lock (including all requests originating outside the |
| 1335 | * USB subsystem), but autoresume requests generated by a child device or |
| 1336 | * interface driver may not be. Usbcore will insure that the method calls |
| 1337 | * do not arrive during bind, unbind, or reset operations. However, drivers |
| 1338 | * must be prepared to handle resume calls arriving at unpredictable times. |
| 1339 | * The only way to block such calls is to do an autoresume (preventing |
| 1340 | * other autoresumes) while holding @udev's device lock (preventing outside |
| 1341 | * resumes). |
| 1342 | * |
| 1343 | * The caller must hold @udev->pm_mutex. |
| 1344 | * |
| 1345 | * This routine can run only in process context. |
| 1346 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1347 | static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1348 | { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1349 | int status = 0; |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1350 | int i; |
| 1351 | struct usb_interface *intf; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1352 | struct usb_device *parent = udev->parent; |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1353 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1354 | cancel_delayed_work(&udev->autosuspend); |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1355 | if (udev->state == USB_STATE_NOTATTACHED) { |
| 1356 | status = -ENODEV; |
| 1357 | goto done; |
| 1358 | } |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 1359 | udev->can_submit = 1; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1360 | |
| 1361 | /* Propagate the resume up the tree, if necessary */ |
| 1362 | if (udev->state == USB_STATE_SUSPENDED) { |
| 1363 | if (parent) { |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1364 | status = usb_autoresume_device(parent); |
Alan Stern | ee49fb5 | 2006-11-22 16:55:54 -0500 | [diff] [blame] | 1365 | if (status == 0) { |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1366 | status = usb_resume_device(udev, msg); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1367 | if (status || udev->state == |
| 1368 | USB_STATE_NOTATTACHED) { |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1369 | usb_autosuspend_device(parent); |
Alan Stern | ee49fb5 | 2006-11-22 16:55:54 -0500 | [diff] [blame] | 1370 | |
| 1371 | /* It's possible usb_resume_device() |
| 1372 | * failed after the port was |
| 1373 | * unsuspended, causing udev to be |
| 1374 | * logically disconnected. We don't |
| 1375 | * want usb_disconnect() to autosuspend |
| 1376 | * the parent again, so tell it that |
| 1377 | * udev disconnected while still |
| 1378 | * suspended. */ |
| 1379 | if (udev->state == |
| 1380 | USB_STATE_NOTATTACHED) |
| 1381 | udev->discon_suspended = 1; |
| 1382 | } |
| 1383 | } |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1384 | } else { |
| 1385 | |
| 1386 | /* We can't progagate beyond the USB subsystem, |
| 1387 | * so if a root hub's controller is suspended |
| 1388 | * then we're stuck. */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1389 | status = usb_resume_device(udev, msg); |
Greg Kroah-Hartman | 2c044a4 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1390 | } |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1391 | } else if (udev->reset_resume) |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1392 | status = usb_resume_device(udev, msg); |
Alan Stern | 114b368 | 2006-07-01 22:13:04 -0400 | [diff] [blame] | 1393 | |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1394 | if (status == 0 && udev->actconfig) { |
| 1395 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 1396 | intf = udev->actconfig->interface[i]; |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1397 | usb_resume_interface(udev, intf, msg, |
| 1398 | udev->reset_resume); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1399 | } |
| 1400 | } |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1401 | |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1402 | done: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1403 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
Alan Stern | 70a1c9e | 2008-03-06 17:00:58 -0500 | [diff] [blame] | 1404 | if (!status) |
| 1405 | udev->reset_resume = 0; |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 1406 | return status; |
| 1407 | } |
| 1408 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1409 | #ifdef CONFIG_USB_SUSPEND |
| 1410 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1411 | /* Internal routine to adjust a device's usage counter and change |
| 1412 | * its autosuspend state. |
| 1413 | */ |
| 1414 | static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt) |
| 1415 | { |
| 1416 | int status = 0; |
| 1417 | |
| 1418 | usb_pm_lock(udev); |
| 1419 | udev->pm_usage_cnt += inc_usage_cnt; |
| 1420 | WARN_ON(udev->pm_usage_cnt < 0); |
Alan Stern | 013d27f | 2007-08-20 12:18:39 -0400 | [diff] [blame] | 1421 | if (inc_usage_cnt) |
| 1422 | udev->last_busy = jiffies; |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1423 | if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) { |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1424 | if (udev->state == USB_STATE_SUSPENDED) |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1425 | status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1426 | if (status != 0) |
| 1427 | udev->pm_usage_cnt -= inc_usage_cnt; |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1428 | else if (inc_usage_cnt) |
| 1429 | udev->last_busy = jiffies; |
| 1430 | } else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) { |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1431 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1432 | } |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1433 | usb_pm_unlock(udev); |
| 1434 | return status; |
| 1435 | } |
| 1436 | |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1437 | /* usb_autosuspend_work - callback routine to autosuspend a USB device */ |
| 1438 | void usb_autosuspend_work(struct work_struct *work) |
| 1439 | { |
| 1440 | struct usb_device *udev = |
| 1441 | container_of(work, struct usb_device, autosuspend.work); |
| 1442 | |
| 1443 | usb_autopm_do_device(udev, 0); |
| 1444 | } |
| 1445 | |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1446 | /* usb_autoresume_work - callback routine to autoresume a USB device */ |
| 1447 | void usb_autoresume_work(struct work_struct *work) |
| 1448 | { |
| 1449 | struct usb_device *udev = |
| 1450 | container_of(work, struct usb_device, autoresume); |
| 1451 | |
| 1452 | /* Wake it up, let the drivers do their thing, and then put it |
| 1453 | * back to sleep. |
| 1454 | */ |
| 1455 | if (usb_autopm_do_device(udev, 1) == 0) |
| 1456 | usb_autopm_do_device(udev, -1); |
| 1457 | } |
| 1458 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1459 | /** |
| 1460 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces |
Henrik Kretzschmar | 701f35a | 2006-09-25 17:00:56 -0700 | [diff] [blame] | 1461 | * @udev: the usb_device to autosuspend |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1462 | * |
| 1463 | * This routine should be called when a core subsystem is finished using |
| 1464 | * @udev and wants to allow it to autosuspend. Examples would be when |
| 1465 | * @udev's device file in usbfs is closed or after a configuration change. |
| 1466 | * |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1467 | * @udev's usage counter is decremented. If it or any of the usage counters |
| 1468 | * for an active interface is greater than 0, no autosuspend request will be |
| 1469 | * queued. (If an interface driver does not support autosuspend then its |
| 1470 | * usage counter is permanently positive.) Furthermore, if an interface |
| 1471 | * driver requires remote-wakeup capability during autosuspend but remote |
| 1472 | * wakeup is disabled, the autosuspend will fail. |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1473 | * |
| 1474 | * Often the caller will hold @udev's device lock, but this is not |
| 1475 | * necessary. |
| 1476 | * |
| 1477 | * This routine can run only in process context. |
| 1478 | */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1479 | void usb_autosuspend_device(struct usb_device *udev) |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1480 | { |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1481 | int status; |
| 1482 | |
| 1483 | status = usb_autopm_do_device(udev, -1); |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1484 | dev_vdbg(&udev->dev, "%s: cnt %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1485 | __func__, udev->pm_usage_cnt); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1486 | } |
| 1487 | |
| 1488 | /** |
Alan Stern | 19c2623 | 2007-02-20 15:03:32 -0500 | [diff] [blame] | 1489 | * usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces |
| 1490 | * @udev: the usb_device to autosuspend |
| 1491 | * |
| 1492 | * This routine should be called when a core subsystem thinks @udev may |
| 1493 | * be ready to autosuspend. |
| 1494 | * |
| 1495 | * @udev's usage counter left unchanged. If it or any of the usage counters |
| 1496 | * for an active interface is greater than 0, or autosuspend is not allowed |
| 1497 | * for any other reason, no autosuspend request will be queued. |
| 1498 | * |
| 1499 | * This routine can run only in process context. |
| 1500 | */ |
| 1501 | void usb_try_autosuspend_device(struct usb_device *udev) |
| 1502 | { |
| 1503 | usb_autopm_do_device(udev, 0); |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1504 | dev_vdbg(&udev->dev, "%s: cnt %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1505 | __func__, udev->pm_usage_cnt); |
Alan Stern | 19c2623 | 2007-02-20 15:03:32 -0500 | [diff] [blame] | 1506 | } |
| 1507 | |
| 1508 | /** |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1509 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces |
Henrik Kretzschmar | 701f35a | 2006-09-25 17:00:56 -0700 | [diff] [blame] | 1510 | * @udev: the usb_device to autoresume |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1511 | * |
| 1512 | * This routine should be called when a core subsystem wants to use @udev |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1513 | * and needs to guarantee that it is not suspended. No autosuspend will |
| 1514 | * occur until usb_autosuspend_device is called. (Note that this will not |
| 1515 | * prevent suspend events originating in the PM core.) Examples would be |
| 1516 | * when @udev's device file in usbfs is opened or when a remote-wakeup |
| 1517 | * request is received. |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1518 | * |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1519 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
| 1520 | * However if the autoresume fails then the usage counter is re-decremented. |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1521 | * |
| 1522 | * Often the caller will hold @udev's device lock, but this is not |
| 1523 | * necessary (and attempting it might cause deadlock). |
| 1524 | * |
| 1525 | * This routine can run only in process context. |
| 1526 | */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1527 | int usb_autoresume_device(struct usb_device *udev) |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1528 | { |
| 1529 | int status; |
| 1530 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1531 | status = usb_autopm_do_device(udev, 1); |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1532 | dev_vdbg(&udev->dev, "%s: status %d cnt %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1533 | __func__, status, udev->pm_usage_cnt); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1534 | return status; |
| 1535 | } |
| 1536 | |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1537 | /* Internal routine to adjust an interface's usage counter and change |
| 1538 | * its device's autosuspend state. |
| 1539 | */ |
| 1540 | static int usb_autopm_do_interface(struct usb_interface *intf, |
| 1541 | int inc_usage_cnt) |
| 1542 | { |
| 1543 | struct usb_device *udev = interface_to_usbdev(intf); |
| 1544 | int status = 0; |
| 1545 | |
| 1546 | usb_pm_lock(udev); |
| 1547 | if (intf->condition == USB_INTERFACE_UNBOUND) |
| 1548 | status = -ENODEV; |
| 1549 | else { |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1550 | atomic_add(inc_usage_cnt, &intf->pm_usage_cnt); |
Alan Stern | 013d27f | 2007-08-20 12:18:39 -0400 | [diff] [blame] | 1551 | udev->last_busy = jiffies; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1552 | if (inc_usage_cnt >= 0 && |
| 1553 | atomic_read(&intf->pm_usage_cnt) > 0) { |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1554 | if (udev->state == USB_STATE_SUSPENDED) |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1555 | status = usb_resume_both(udev, |
| 1556 | PMSG_AUTO_RESUME); |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1557 | if (status != 0) |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1558 | atomic_sub(inc_usage_cnt, &intf->pm_usage_cnt); |
Alan Stern | 013d27f | 2007-08-20 12:18:39 -0400 | [diff] [blame] | 1559 | else |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1560 | udev->last_busy = jiffies; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1561 | } else if (inc_usage_cnt <= 0 && |
| 1562 | atomic_read(&intf->pm_usage_cnt) <= 0) { |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1563 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1564 | } |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1565 | } |
| 1566 | usb_pm_unlock(udev); |
| 1567 | return status; |
| 1568 | } |
| 1569 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1570 | /** |
| 1571 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter |
Henrik Kretzschmar | 701f35a | 2006-09-25 17:00:56 -0700 | [diff] [blame] | 1572 | * @intf: the usb_interface whose counter should be decremented |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1573 | * |
| 1574 | * This routine should be called by an interface driver when it is |
| 1575 | * finished using @intf and wants to allow it to autosuspend. A typical |
| 1576 | * example would be a character-device driver when its device file is |
| 1577 | * closed. |
| 1578 | * |
| 1579 | * The routine decrements @intf's usage counter. When the counter reaches |
| 1580 | * 0, a delayed autosuspend request for @intf's device is queued. When |
| 1581 | * the delay expires, if @intf->pm_usage_cnt is still <= 0 along with all |
| 1582 | * the other usage counters for the sibling interfaces and @intf's |
| 1583 | * usb_device, the device and all its interfaces will be autosuspended. |
| 1584 | * |
| 1585 | * Note that @intf->pm_usage_cnt is owned by the interface driver. The |
| 1586 | * core will not change its value other than the increment and decrement |
| 1587 | * in usb_autopm_get_interface and usb_autopm_put_interface. The driver |
| 1588 | * may use this simple counter-oriented discipline or may set the value |
| 1589 | * any way it likes. |
| 1590 | * |
| 1591 | * If the driver has set @intf->needs_remote_wakeup then autosuspend will |
| 1592 | * take place only if the device's remote-wakeup facility is enabled. |
| 1593 | * |
| 1594 | * Suspend method calls queued by this routine can arrive at any time |
| 1595 | * while @intf is resumed and its usage counter is equal to 0. They are |
| 1596 | * not protected by the usb_device's lock but only by its pm_mutex. |
| 1597 | * Drivers must provide their own synchronization. |
| 1598 | * |
| 1599 | * This routine can run only in process context. |
| 1600 | */ |
| 1601 | void usb_autopm_put_interface(struct usb_interface *intf) |
| 1602 | { |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1603 | int status; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1604 | |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1605 | status = usb_autopm_do_interface(intf, -1); |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1606 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1607 | __func__, status, atomic_read(&intf->pm_usage_cnt)); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1608 | } |
| 1609 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); |
| 1610 | |
| 1611 | /** |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1612 | * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter |
| 1613 | * @intf: the usb_interface whose counter should be decremented |
| 1614 | * |
| 1615 | * This routine does essentially the same thing as |
| 1616 | * usb_autopm_put_interface(): it decrements @intf's usage counter and |
| 1617 | * queues a delayed autosuspend request if the counter is <= 0. The |
| 1618 | * difference is that it does not acquire the device's pm_mutex; |
| 1619 | * callers must handle all synchronization issues themselves. |
| 1620 | * |
| 1621 | * Typically a driver would call this routine during an URB's completion |
| 1622 | * handler, if no more URBs were pending. |
| 1623 | * |
| 1624 | * This routine can run in atomic context. |
| 1625 | */ |
| 1626 | void usb_autopm_put_interface_async(struct usb_interface *intf) |
| 1627 | { |
| 1628 | struct usb_device *udev = interface_to_usbdev(intf); |
| 1629 | int status = 0; |
| 1630 | |
| 1631 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
| 1632 | status = -ENODEV; |
| 1633 | } else { |
| 1634 | udev->last_busy = jiffies; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1635 | atomic_dec(&intf->pm_usage_cnt); |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1636 | if (udev->autosuspend_disabled || udev->autosuspend_delay < 0) |
| 1637 | status = -EPERM; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1638 | else if (atomic_read(&intf->pm_usage_cnt) <= 0 && |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1639 | !timer_pending(&udev->autosuspend.timer)) { |
| 1640 | queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, |
Alan Stern | 4ec06d6 | 2008-11-25 16:40:02 -0500 | [diff] [blame] | 1641 | round_jiffies_up_relative( |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1642 | udev->autosuspend_delay)); |
| 1643 | } |
| 1644 | } |
| 1645 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1646 | __func__, status, atomic_read(&intf->pm_usage_cnt)); |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1647 | } |
| 1648 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); |
| 1649 | |
| 1650 | /** |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1651 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter |
Henrik Kretzschmar | 701f35a | 2006-09-25 17:00:56 -0700 | [diff] [blame] | 1652 | * @intf: the usb_interface whose counter should be incremented |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1653 | * |
| 1654 | * This routine should be called by an interface driver when it wants to |
| 1655 | * use @intf and needs to guarantee that it is not suspended. In addition, |
| 1656 | * the routine prevents @intf from being autosuspended subsequently. (Note |
| 1657 | * that this will not prevent suspend events originating in the PM core.) |
| 1658 | * This prevention will persist until usb_autopm_put_interface() is called |
| 1659 | * or @intf is unbound. A typical example would be a character-device |
| 1660 | * driver when its device file is opened. |
| 1661 | * |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 1662 | * |
| 1663 | * The routine increments @intf's usage counter. (However if the |
| 1664 | * autoresume fails then the counter is re-decremented.) So long as the |
| 1665 | * counter is greater than 0, autosuspend will not be allowed for @intf |
| 1666 | * or its usb_device. When the driver is finished using @intf it should |
| 1667 | * call usb_autopm_put_interface() to decrement the usage counter and |
| 1668 | * queue a delayed autosuspend request (if the counter is <= 0). |
| 1669 | * |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1670 | * |
| 1671 | * Note that @intf->pm_usage_cnt is owned by the interface driver. The |
| 1672 | * core will not change its value other than the increment and decrement |
| 1673 | * in usb_autopm_get_interface and usb_autopm_put_interface. The driver |
| 1674 | * may use this simple counter-oriented discipline or may set the value |
| 1675 | * any way it likes. |
| 1676 | * |
| 1677 | * Resume method calls generated by this routine can arrive at any time |
| 1678 | * while @intf is suspended. They are not protected by the usb_device's |
| 1679 | * lock but only by its pm_mutex. Drivers must provide their own |
| 1680 | * synchronization. |
| 1681 | * |
| 1682 | * This routine can run only in process context. |
| 1683 | */ |
| 1684 | int usb_autopm_get_interface(struct usb_interface *intf) |
| 1685 | { |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1686 | int status; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1687 | |
Alan Stern | af4f760 | 2006-10-30 17:06:45 -0500 | [diff] [blame] | 1688 | status = usb_autopm_do_interface(intf, 1); |
Alan Stern | 20dfdad | 2007-05-22 11:50:17 -0400 | [diff] [blame] | 1689 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1690 | __func__, status, atomic_read(&intf->pm_usage_cnt)); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1691 | return status; |
| 1692 | } |
| 1693 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
| 1694 | |
Alan Stern | 692a186 | 2006-10-30 17:07:51 -0500 | [diff] [blame] | 1695 | /** |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1696 | * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter |
| 1697 | * @intf: the usb_interface whose counter should be incremented |
| 1698 | * |
| 1699 | * This routine does much the same thing as |
| 1700 | * usb_autopm_get_interface(): it increments @intf's usage counter and |
| 1701 | * queues an autoresume request if the result is > 0. The differences |
| 1702 | * are that it does not acquire the device's pm_mutex (callers must |
| 1703 | * handle all synchronization issues themselves), and it does not |
| 1704 | * autoresume the device directly (it only queues a request). After a |
| 1705 | * successful call, the device will generally not yet be resumed. |
| 1706 | * |
| 1707 | * This routine can run in atomic context. |
| 1708 | */ |
| 1709 | int usb_autopm_get_interface_async(struct usb_interface *intf) |
| 1710 | { |
| 1711 | struct usb_device *udev = interface_to_usbdev(intf); |
| 1712 | int status = 0; |
| 1713 | |
| 1714 | if (intf->condition == USB_INTERFACE_UNBOUND) |
| 1715 | status = -ENODEV; |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1716 | else { |
| 1717 | atomic_inc(&intf->pm_usage_cnt); |
| 1718 | if (atomic_read(&intf->pm_usage_cnt) > 0 && |
| 1719 | udev->state == USB_STATE_SUSPENDED) |
| 1720 | queue_work(ksuspend_usb_wq, &udev->autoresume); |
| 1721 | } |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1722 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
Alan Stern | ccf5b80 | 2009-06-29 11:00:01 -0400 | [diff] [blame] | 1723 | __func__, status, atomic_read(&intf->pm_usage_cnt)); |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1724 | return status; |
| 1725 | } |
| 1726 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); |
| 1727 | |
Alan Stern | 718efa6 | 2007-03-09 15:41:13 -0500 | [diff] [blame] | 1728 | #else |
| 1729 | |
| 1730 | void usb_autosuspend_work(struct work_struct *work) |
| 1731 | {} |
| 1732 | |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1733 | void usb_autoresume_work(struct work_struct *work) |
| 1734 | {} |
| 1735 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1736 | #endif /* CONFIG_USB_SUSPEND */ |
| 1737 | |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1738 | /** |
| 1739 | * usb_external_suspend_device - external suspend of a USB device and its interfaces |
| 1740 | * @udev: the usb_device to suspend |
| 1741 | * @msg: Power Management message describing this state transition |
| 1742 | * |
| 1743 | * This routine handles external suspend requests: ones not generated |
| 1744 | * internally by a USB driver (autosuspend) but rather coming from the user |
| 1745 | * (via sysfs) or the PM core (system sleep). The suspend will be carried |
| 1746 | * out regardless of @udev's usage counter or those of its interfaces, |
| 1747 | * and regardless of whether or not remote wakeup is enabled. Of course, |
| 1748 | * interface drivers still have the option of failing the suspend (if |
| 1749 | * there are unsuspended children, for example). |
| 1750 | * |
| 1751 | * The caller must hold @udev's device lock. |
| 1752 | */ |
| 1753 | int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg) |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1754 | { |
| 1755 | int status; |
| 1756 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 1757 | do_unbind_rebind(udev, DO_UNBIND); |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1758 | usb_pm_lock(udev); |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1759 | status = usb_suspend_both(udev, msg); |
| 1760 | usb_pm_unlock(udev); |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1761 | return status; |
| 1762 | } |
| 1763 | |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1764 | /** |
| 1765 | * usb_external_resume_device - external resume of a USB device and its interfaces |
| 1766 | * @udev: the usb_device to resume |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1767 | * @msg: Power Management message describing this state transition |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1768 | * |
| 1769 | * This routine handles external resume requests: ones not generated |
| 1770 | * internally by a USB driver (autoresume) but rather coming from the user |
| 1771 | * (via sysfs), the PM core (system resume), or the device itself (remote |
| 1772 | * wakeup). @udev's usage counter is unaffected. |
| 1773 | * |
| 1774 | * The caller must hold @udev's device lock. |
| 1775 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1776 | int usb_external_resume_device(struct usb_device *udev, pm_message_t msg) |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1777 | { |
| 1778 | int status; |
| 1779 | |
| 1780 | usb_pm_lock(udev); |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1781 | status = usb_resume_both(udev, msg); |
Alan Stern | ef7f6c7 | 2007-04-05 16:03:49 -0400 | [diff] [blame] | 1782 | udev->last_busy = jiffies; |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1783 | usb_pm_unlock(udev); |
Alan Stern | 6c64094 | 2008-10-21 15:40:03 -0400 | [diff] [blame] | 1784 | if (status == 0) |
| 1785 | do_unbind_rebind(udev, DO_REBIND); |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1786 | |
| 1787 | /* Now that the device is awake, we can start trying to autosuspend |
| 1788 | * it again. */ |
| 1789 | if (status == 0) |
| 1790 | usb_try_autosuspend_device(udev); |
| 1791 | return status; |
| 1792 | } |
| 1793 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1794 | int usb_suspend(struct device *dev, pm_message_t msg) |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1795 | { |
Alan Stern | 271f9e6 | 2007-10-10 16:30:12 -0400 | [diff] [blame] | 1796 | struct usb_device *udev; |
| 1797 | |
Alan Stern | 271f9e6 | 2007-10-10 16:30:12 -0400 | [diff] [blame] | 1798 | udev = to_usb_device(dev); |
| 1799 | |
| 1800 | /* If udev is already suspended, we can skip this suspend and |
Alan Stern | 3bb1af5 | 2008-03-03 15:15:36 -0500 | [diff] [blame] | 1801 | * we should also skip the upcoming system resume. High-speed |
| 1802 | * root hubs are an exception; they need to resume whenever the |
| 1803 | * system wakes up in order for USB-PERSIST port handover to work |
| 1804 | * properly. |
| 1805 | */ |
Alan Stern | 271f9e6 | 2007-10-10 16:30:12 -0400 | [diff] [blame] | 1806 | if (udev->state == USB_STATE_SUSPENDED) { |
Alan Stern | 3bb1af5 | 2008-03-03 15:15:36 -0500 | [diff] [blame] | 1807 | if (udev->parent || udev->speed != USB_SPEED_HIGH) |
| 1808 | udev->skip_sys_resume = 1; |
Alan Stern | 271f9e6 | 2007-10-10 16:30:12 -0400 | [diff] [blame] | 1809 | return 0; |
| 1810 | } |
| 1811 | |
| 1812 | udev->skip_sys_resume = 0; |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1813 | return usb_external_suspend_device(udev, msg); |
Alan Stern | 6b157c9 | 2007-03-13 16:37:30 -0400 | [diff] [blame] | 1814 | } |
| 1815 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1816 | int usb_resume(struct device *dev, pm_message_t msg) |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1817 | { |
Alan Stern | 2add522 | 2007-03-20 14:59:39 -0400 | [diff] [blame] | 1818 | struct usb_device *udev; |
Frans Pop | 23a54e5 | 2009-06-04 22:30:48 +0200 | [diff] [blame] | 1819 | int status; |
Alan Stern | 2add522 | 2007-03-20 14:59:39 -0400 | [diff] [blame] | 1820 | |
Alan Stern | 2add522 | 2007-03-20 14:59:39 -0400 | [diff] [blame] | 1821 | udev = to_usb_device(dev); |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 1822 | |
Alan Stern | 271f9e6 | 2007-10-10 16:30:12 -0400 | [diff] [blame] | 1823 | /* If udev->skip_sys_resume is set then udev was already suspended |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 1824 | * when the system sleep started, so we don't want to resume it |
| 1825 | * during this system wakeup. |
| 1826 | */ |
| 1827 | if (udev->skip_sys_resume) |
| 1828 | return 0; |
Frans Pop | 23a54e5 | 2009-06-04 22:30:48 +0200 | [diff] [blame] | 1829 | status = usb_external_resume_device(udev, msg); |
| 1830 | |
| 1831 | /* Avoid PM error messages for devices disconnected while suspended |
| 1832 | * as we'll display regular disconnect messages just a bit later. |
| 1833 | */ |
| 1834 | if (status == -ENODEV) |
| 1835 | return 0; |
| 1836 | return status; |
Alan Stern | 1cc8a25 | 2006-07-01 22:10:15 -0400 | [diff] [blame] | 1837 | } |
| 1838 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1839 | #endif /* CONFIG_PM */ |
| 1840 | |
| 1841 | struct bus_type usb_bus_type = { |
| 1842 | .name = "usb", |
| 1843 | .match = usb_device_match, |
| 1844 | .uevent = usb_uevent, |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1845 | }; |