Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright Linus Torvalds 1999 |
| 3 | * (C) Copyright Johannes Erdfelt 1999-2001 |
| 4 | * (C) Copyright Andreas Gal 1999 |
| 5 | * (C) Copyright Gregory P. Smith 1999 |
| 6 | * (C) Copyright Deti Fliegl 1999 |
| 7 | * (C) Copyright Randy Dunlap 2000 |
| 8 | * (C) Copyright David Brownell 2000-2002 |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 17 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 18 | * for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software Foundation, |
| 22 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | */ |
| 24 | |
| 25 | #include <linux/config.h> |
| 26 | |
| 27 | #ifdef CONFIG_USB_DEBUG |
| 28 | #define DEBUG |
| 29 | #endif |
| 30 | |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/version.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/completion.h> |
| 36 | #include <linux/utsname.h> |
| 37 | #include <linux/mm.h> |
| 38 | #include <asm/io.h> |
| 39 | #include <asm/scatterlist.h> |
| 40 | #include <linux/device.h> |
| 41 | #include <linux/dma-mapping.h> |
| 42 | #include <asm/irq.h> |
| 43 | #include <asm/byteorder.h> |
| 44 | |
| 45 | #include <linux/usb.h> |
| 46 | |
| 47 | #include "usb.h" |
| 48 | #include "hcd.h" |
| 49 | #include "hub.h" |
| 50 | |
| 51 | |
| 52 | // #define USB_BANDWIDTH_MESSAGES |
| 53 | |
| 54 | /*-------------------------------------------------------------------------*/ |
| 55 | |
| 56 | /* |
| 57 | * USB Host Controller Driver framework |
| 58 | * |
| 59 | * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing |
| 60 | * HCD-specific behaviors/bugs. |
| 61 | * |
| 62 | * This does error checks, tracks devices and urbs, and delegates to a |
| 63 | * "hc_driver" only for code (and data) that really needs to know about |
| 64 | * hardware differences. That includes root hub registers, i/o queues, |
| 65 | * and so on ... but as little else as possible. |
| 66 | * |
| 67 | * Shared code includes most of the "root hub" code (these are emulated, |
| 68 | * though each HC's hardware works differently) and PCI glue, plus request |
| 69 | * tracking overhead. The HCD code should only block on spinlocks or on |
| 70 | * hardware handshaking; blocking on software events (such as other kernel |
| 71 | * threads releasing resources, or completing actions) is all generic. |
| 72 | * |
| 73 | * Happens the USB 2.0 spec says this would be invisible inside the "USBD", |
| 74 | * and includes mostly a "HCDI" (HCD Interface) along with some APIs used |
| 75 | * only by the hub driver ... and that neither should be seen or used by |
| 76 | * usb client device drivers. |
| 77 | * |
| 78 | * Contributors of ideas or unattributed patches include: David Brownell, |
| 79 | * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ... |
| 80 | * |
| 81 | * HISTORY: |
| 82 | * 2002-02-21 Pull in most of the usb_bus support from usb.c; some |
| 83 | * associated cleanup. "usb_hcd" still != "usb_bus". |
| 84 | * 2001-12-12 Initial patch version for Linux 2.5.1 kernel. |
| 85 | */ |
| 86 | |
| 87 | /*-------------------------------------------------------------------------*/ |
| 88 | |
| 89 | /* host controllers we manage */ |
| 90 | LIST_HEAD (usb_bus_list); |
| 91 | EXPORT_SYMBOL_GPL (usb_bus_list); |
| 92 | |
| 93 | /* used when allocating bus numbers */ |
| 94 | #define USB_MAXBUS 64 |
| 95 | struct usb_busmap { |
| 96 | unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))]; |
| 97 | }; |
| 98 | static struct usb_busmap busmap; |
| 99 | |
| 100 | /* used when updating list of hcds */ |
| 101 | DECLARE_MUTEX (usb_bus_list_lock); /* exported only for usbfs */ |
| 102 | EXPORT_SYMBOL_GPL (usb_bus_list_lock); |
| 103 | |
| 104 | /* used for controlling access to virtual root hubs */ |
| 105 | static DEFINE_SPINLOCK(hcd_root_hub_lock); |
| 106 | |
| 107 | /* used when updating hcd data */ |
| 108 | static DEFINE_SPINLOCK(hcd_data_lock); |
| 109 | |
| 110 | /* wait queue for synchronous unlinks */ |
| 111 | DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue); |
| 112 | |
| 113 | /*-------------------------------------------------------------------------*/ |
| 114 | |
| 115 | /* |
| 116 | * Sharable chunks of root hub code. |
| 117 | */ |
| 118 | |
| 119 | /*-------------------------------------------------------------------------*/ |
| 120 | |
| 121 | #define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff) |
| 122 | #define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff) |
| 123 | |
| 124 | /* usb 2.0 root hub device descriptor */ |
| 125 | static const u8 usb2_rh_dev_descriptor [18] = { |
| 126 | 0x12, /* __u8 bLength; */ |
| 127 | 0x01, /* __u8 bDescriptorType; Device */ |
| 128 | 0x00, 0x02, /* __le16 bcdUSB; v2.0 */ |
| 129 | |
| 130 | 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ |
| 131 | 0x00, /* __u8 bDeviceSubClass; */ |
| 132 | 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/ |
| 133 | 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ |
| 134 | |
| 135 | 0x00, 0x00, /* __le16 idVendor; */ |
| 136 | 0x00, 0x00, /* __le16 idProduct; */ |
| 137 | KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ |
| 138 | |
| 139 | 0x03, /* __u8 iManufacturer; */ |
| 140 | 0x02, /* __u8 iProduct; */ |
| 141 | 0x01, /* __u8 iSerialNumber; */ |
| 142 | 0x01 /* __u8 bNumConfigurations; */ |
| 143 | }; |
| 144 | |
| 145 | /* no usb 2.0 root hub "device qualifier" descriptor: one speed only */ |
| 146 | |
| 147 | /* usb 1.1 root hub device descriptor */ |
| 148 | static const u8 usb11_rh_dev_descriptor [18] = { |
| 149 | 0x12, /* __u8 bLength; */ |
| 150 | 0x01, /* __u8 bDescriptorType; Device */ |
| 151 | 0x10, 0x01, /* __le16 bcdUSB; v1.1 */ |
| 152 | |
| 153 | 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ |
| 154 | 0x00, /* __u8 bDeviceSubClass; */ |
| 155 | 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */ |
| 156 | 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ |
| 157 | |
| 158 | 0x00, 0x00, /* __le16 idVendor; */ |
| 159 | 0x00, 0x00, /* __le16 idProduct; */ |
| 160 | KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ |
| 161 | |
| 162 | 0x03, /* __u8 iManufacturer; */ |
| 163 | 0x02, /* __u8 iProduct; */ |
| 164 | 0x01, /* __u8 iSerialNumber; */ |
| 165 | 0x01 /* __u8 bNumConfigurations; */ |
| 166 | }; |
| 167 | |
| 168 | |
| 169 | /*-------------------------------------------------------------------------*/ |
| 170 | |
| 171 | /* Configuration descriptors for our root hubs */ |
| 172 | |
| 173 | static const u8 fs_rh_config_descriptor [] = { |
| 174 | |
| 175 | /* one configuration */ |
| 176 | 0x09, /* __u8 bLength; */ |
| 177 | 0x02, /* __u8 bDescriptorType; Configuration */ |
| 178 | 0x19, 0x00, /* __le16 wTotalLength; */ |
| 179 | 0x01, /* __u8 bNumInterfaces; (1) */ |
| 180 | 0x01, /* __u8 bConfigurationValue; */ |
| 181 | 0x00, /* __u8 iConfiguration; */ |
| 182 | 0xc0, /* __u8 bmAttributes; |
| 183 | Bit 7: must be set, |
| 184 | 6: Self-powered, |
| 185 | 5: Remote wakeup, |
| 186 | 4..0: resvd */ |
| 187 | 0x00, /* __u8 MaxPower; */ |
| 188 | |
| 189 | /* USB 1.1: |
| 190 | * USB 2.0, single TT organization (mandatory): |
| 191 | * one interface, protocol 0 |
| 192 | * |
| 193 | * USB 2.0, multiple TT organization (optional): |
| 194 | * two interfaces, protocols 1 (like single TT) |
| 195 | * and 2 (multiple TT mode) ... config is |
| 196 | * sometimes settable |
| 197 | * NOT IMPLEMENTED |
| 198 | */ |
| 199 | |
| 200 | /* one interface */ |
| 201 | 0x09, /* __u8 if_bLength; */ |
| 202 | 0x04, /* __u8 if_bDescriptorType; Interface */ |
| 203 | 0x00, /* __u8 if_bInterfaceNumber; */ |
| 204 | 0x00, /* __u8 if_bAlternateSetting; */ |
| 205 | 0x01, /* __u8 if_bNumEndpoints; */ |
| 206 | 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ |
| 207 | 0x00, /* __u8 if_bInterfaceSubClass; */ |
| 208 | 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */ |
| 209 | 0x00, /* __u8 if_iInterface; */ |
| 210 | |
| 211 | /* one endpoint (status change endpoint) */ |
| 212 | 0x07, /* __u8 ep_bLength; */ |
| 213 | 0x05, /* __u8 ep_bDescriptorType; Endpoint */ |
| 214 | 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ |
| 215 | 0x03, /* __u8 ep_bmAttributes; Interrupt */ |
| 216 | 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */ |
| 217 | 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */ |
| 218 | }; |
| 219 | |
| 220 | static const u8 hs_rh_config_descriptor [] = { |
| 221 | |
| 222 | /* one configuration */ |
| 223 | 0x09, /* __u8 bLength; */ |
| 224 | 0x02, /* __u8 bDescriptorType; Configuration */ |
| 225 | 0x19, 0x00, /* __le16 wTotalLength; */ |
| 226 | 0x01, /* __u8 bNumInterfaces; (1) */ |
| 227 | 0x01, /* __u8 bConfigurationValue; */ |
| 228 | 0x00, /* __u8 iConfiguration; */ |
| 229 | 0xc0, /* __u8 bmAttributes; |
| 230 | Bit 7: must be set, |
| 231 | 6: Self-powered, |
| 232 | 5: Remote wakeup, |
| 233 | 4..0: resvd */ |
| 234 | 0x00, /* __u8 MaxPower; */ |
| 235 | |
| 236 | /* USB 1.1: |
| 237 | * USB 2.0, single TT organization (mandatory): |
| 238 | * one interface, protocol 0 |
| 239 | * |
| 240 | * USB 2.0, multiple TT organization (optional): |
| 241 | * two interfaces, protocols 1 (like single TT) |
| 242 | * and 2 (multiple TT mode) ... config is |
| 243 | * sometimes settable |
| 244 | * NOT IMPLEMENTED |
| 245 | */ |
| 246 | |
| 247 | /* one interface */ |
| 248 | 0x09, /* __u8 if_bLength; */ |
| 249 | 0x04, /* __u8 if_bDescriptorType; Interface */ |
| 250 | 0x00, /* __u8 if_bInterfaceNumber; */ |
| 251 | 0x00, /* __u8 if_bAlternateSetting; */ |
| 252 | 0x01, /* __u8 if_bNumEndpoints; */ |
| 253 | 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ |
| 254 | 0x00, /* __u8 if_bInterfaceSubClass; */ |
| 255 | 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */ |
| 256 | 0x00, /* __u8 if_iInterface; */ |
| 257 | |
| 258 | /* one endpoint (status change endpoint) */ |
| 259 | 0x07, /* __u8 ep_bLength; */ |
| 260 | 0x05, /* __u8 ep_bDescriptorType; Endpoint */ |
| 261 | 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ |
| 262 | 0x03, /* __u8 ep_bmAttributes; Interrupt */ |
| 263 | 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */ |
| 264 | 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */ |
| 265 | }; |
| 266 | |
| 267 | /*-------------------------------------------------------------------------*/ |
| 268 | |
| 269 | /* |
| 270 | * helper routine for returning string descriptors in UTF-16LE |
| 271 | * input can actually be ISO-8859-1; ASCII is its 7-bit subset |
| 272 | */ |
| 273 | static int ascii2utf (char *s, u8 *utf, int utfmax) |
| 274 | { |
| 275 | int retval; |
| 276 | |
| 277 | for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) { |
| 278 | *utf++ = *s++; |
| 279 | *utf++ = 0; |
| 280 | } |
| 281 | if (utfmax > 0) { |
| 282 | *utf = *s; |
| 283 | ++retval; |
| 284 | } |
| 285 | return retval; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * rh_string - provides manufacturer, product and serial strings for root hub |
| 290 | * @id: the string ID number (1: serial number, 2: product, 3: vendor) |
| 291 | * @hcd: the host controller for this root hub |
| 292 | * @type: string describing our driver |
| 293 | * @data: return packet in UTF-16 LE |
| 294 | * @len: length of the return packet |
| 295 | * |
| 296 | * Produces either a manufacturer, product or serial number string for the |
| 297 | * virtual root hub device. |
| 298 | */ |
| 299 | static int rh_string ( |
| 300 | int id, |
| 301 | struct usb_hcd *hcd, |
| 302 | u8 *data, |
| 303 | int len |
| 304 | ) { |
| 305 | char buf [100]; |
| 306 | |
| 307 | // language ids |
| 308 | if (id == 0) { |
| 309 | buf[0] = 4; buf[1] = 3; /* 4 bytes string data */ |
| 310 | buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */ |
| 311 | len = min (len, 4); |
| 312 | memcpy (data, buf, len); |
| 313 | return len; |
| 314 | |
| 315 | // serial number |
| 316 | } else if (id == 1) { |
| 317 | strlcpy (buf, hcd->self.bus_name, sizeof buf); |
| 318 | |
| 319 | // product description |
| 320 | } else if (id == 2) { |
| 321 | strlcpy (buf, hcd->product_desc, sizeof buf); |
| 322 | |
| 323 | // id 3 == vendor description |
| 324 | } else if (id == 3) { |
| 325 | snprintf (buf, sizeof buf, "%s %s %s", system_utsname.sysname, |
| 326 | system_utsname.release, hcd->driver->description); |
| 327 | |
| 328 | // unsupported IDs --> "protocol stall" |
| 329 | } else |
| 330 | return -EPIPE; |
| 331 | |
| 332 | switch (len) { /* All cases fall through */ |
| 333 | default: |
| 334 | len = 2 + ascii2utf (buf, data + 2, len - 2); |
| 335 | case 2: |
| 336 | data [1] = 3; /* type == string */ |
| 337 | case 1: |
| 338 | data [0] = 2 * (strlen (buf) + 1); |
| 339 | case 0: |
| 340 | ; /* Compiler wants a statement here */ |
| 341 | } |
| 342 | return len; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | /* Root hub control transfers execute synchronously */ |
| 347 | static int rh_call_control (struct usb_hcd *hcd, struct urb *urb) |
| 348 | { |
| 349 | struct usb_ctrlrequest *cmd; |
| 350 | u16 typeReq, wValue, wIndex, wLength; |
| 351 | u8 *ubuf = urb->transfer_buffer; |
| 352 | u8 tbuf [sizeof (struct usb_hub_descriptor)]; |
| 353 | const u8 *bufp = tbuf; |
| 354 | int len = 0; |
| 355 | int patch_wakeup = 0; |
| 356 | unsigned long flags; |
| 357 | int status = 0; |
| 358 | int n; |
| 359 | |
| 360 | cmd = (struct usb_ctrlrequest *) urb->setup_packet; |
| 361 | typeReq = (cmd->bRequestType << 8) | cmd->bRequest; |
| 362 | wValue = le16_to_cpu (cmd->wValue); |
| 363 | wIndex = le16_to_cpu (cmd->wIndex); |
| 364 | wLength = le16_to_cpu (cmd->wLength); |
| 365 | |
| 366 | if (wLength > urb->transfer_buffer_length) |
| 367 | goto error; |
| 368 | |
| 369 | urb->actual_length = 0; |
| 370 | switch (typeReq) { |
| 371 | |
| 372 | /* DEVICE REQUESTS */ |
| 373 | |
| 374 | case DeviceRequest | USB_REQ_GET_STATUS: |
| 375 | tbuf [0] = (hcd->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP) |
| 376 | | (1 << USB_DEVICE_SELF_POWERED); |
| 377 | tbuf [1] = 0; |
| 378 | len = 2; |
| 379 | break; |
| 380 | case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: |
| 381 | if (wValue == USB_DEVICE_REMOTE_WAKEUP) |
| 382 | hcd->remote_wakeup = 0; |
| 383 | else |
| 384 | goto error; |
| 385 | break; |
| 386 | case DeviceOutRequest | USB_REQ_SET_FEATURE: |
| 387 | if (hcd->can_wakeup && wValue == USB_DEVICE_REMOTE_WAKEUP) |
| 388 | hcd->remote_wakeup = 1; |
| 389 | else |
| 390 | goto error; |
| 391 | break; |
| 392 | case DeviceRequest | USB_REQ_GET_CONFIGURATION: |
| 393 | tbuf [0] = 1; |
| 394 | len = 1; |
| 395 | /* FALLTHROUGH */ |
| 396 | case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: |
| 397 | break; |
| 398 | case DeviceRequest | USB_REQ_GET_DESCRIPTOR: |
| 399 | switch (wValue & 0xff00) { |
| 400 | case USB_DT_DEVICE << 8: |
| 401 | if (hcd->driver->flags & HCD_USB2) |
| 402 | bufp = usb2_rh_dev_descriptor; |
| 403 | else if (hcd->driver->flags & HCD_USB11) |
| 404 | bufp = usb11_rh_dev_descriptor; |
| 405 | else |
| 406 | goto error; |
| 407 | len = 18; |
| 408 | break; |
| 409 | case USB_DT_CONFIG << 8: |
| 410 | if (hcd->driver->flags & HCD_USB2) { |
| 411 | bufp = hs_rh_config_descriptor; |
| 412 | len = sizeof hs_rh_config_descriptor; |
| 413 | } else { |
| 414 | bufp = fs_rh_config_descriptor; |
| 415 | len = sizeof fs_rh_config_descriptor; |
| 416 | } |
| 417 | if (hcd->can_wakeup) |
| 418 | patch_wakeup = 1; |
| 419 | break; |
| 420 | case USB_DT_STRING << 8: |
| 421 | n = rh_string (wValue & 0xff, hcd, ubuf, wLength); |
| 422 | if (n < 0) |
| 423 | goto error; |
| 424 | urb->actual_length = n; |
| 425 | break; |
| 426 | default: |
| 427 | goto error; |
| 428 | } |
| 429 | break; |
| 430 | case DeviceRequest | USB_REQ_GET_INTERFACE: |
| 431 | tbuf [0] = 0; |
| 432 | len = 1; |
| 433 | /* FALLTHROUGH */ |
| 434 | case DeviceOutRequest | USB_REQ_SET_INTERFACE: |
| 435 | break; |
| 436 | case DeviceOutRequest | USB_REQ_SET_ADDRESS: |
| 437 | // wValue == urb->dev->devaddr |
| 438 | dev_dbg (hcd->self.controller, "root hub device address %d\n", |
| 439 | wValue); |
| 440 | break; |
| 441 | |
| 442 | /* INTERFACE REQUESTS (no defined feature/status flags) */ |
| 443 | |
| 444 | /* ENDPOINT REQUESTS */ |
| 445 | |
| 446 | case EndpointRequest | USB_REQ_GET_STATUS: |
| 447 | // ENDPOINT_HALT flag |
| 448 | tbuf [0] = 0; |
| 449 | tbuf [1] = 0; |
| 450 | len = 2; |
| 451 | /* FALLTHROUGH */ |
| 452 | case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: |
| 453 | case EndpointOutRequest | USB_REQ_SET_FEATURE: |
| 454 | dev_dbg (hcd->self.controller, "no endpoint features yet\n"); |
| 455 | break; |
| 456 | |
| 457 | /* CLASS REQUESTS (and errors) */ |
| 458 | |
| 459 | default: |
| 460 | /* non-generic request */ |
| 461 | if (HC_IS_SUSPENDED (hcd->state)) |
| 462 | status = -EAGAIN; |
| 463 | else { |
| 464 | switch (typeReq) { |
| 465 | case GetHubStatus: |
| 466 | case GetPortStatus: |
| 467 | len = 4; |
| 468 | break; |
| 469 | case GetHubDescriptor: |
| 470 | len = sizeof (struct usb_hub_descriptor); |
| 471 | break; |
| 472 | } |
| 473 | status = hcd->driver->hub_control (hcd, |
| 474 | typeReq, wValue, wIndex, |
| 475 | tbuf, wLength); |
| 476 | } |
| 477 | break; |
| 478 | error: |
| 479 | /* "protocol stall" on error */ |
| 480 | status = -EPIPE; |
| 481 | } |
| 482 | |
| 483 | if (status) { |
| 484 | len = 0; |
| 485 | if (status != -EPIPE) { |
| 486 | dev_dbg (hcd->self.controller, |
| 487 | "CTRL: TypeReq=0x%x val=0x%x " |
| 488 | "idx=0x%x len=%d ==> %d\n", |
| 489 | typeReq, wValue, wIndex, |
| 490 | wLength, urb->status); |
| 491 | } |
| 492 | } |
| 493 | if (len) { |
| 494 | if (urb->transfer_buffer_length < len) |
| 495 | len = urb->transfer_buffer_length; |
| 496 | urb->actual_length = len; |
| 497 | // always USB_DIR_IN, toward host |
| 498 | memcpy (ubuf, bufp, len); |
| 499 | |
| 500 | /* report whether RH hardware supports remote wakeup */ |
| 501 | if (patch_wakeup && |
| 502 | len > offsetof (struct usb_config_descriptor, |
| 503 | bmAttributes)) |
| 504 | ((struct usb_config_descriptor *)ubuf)->bmAttributes |
| 505 | |= USB_CONFIG_ATT_WAKEUP; |
| 506 | } |
| 507 | |
| 508 | /* any errors get returned through the urb completion */ |
| 509 | local_irq_save (flags); |
| 510 | spin_lock (&urb->lock); |
| 511 | if (urb->status == -EINPROGRESS) |
| 512 | urb->status = status; |
| 513 | spin_unlock (&urb->lock); |
| 514 | usb_hcd_giveback_urb (hcd, urb, NULL); |
| 515 | local_irq_restore (flags); |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | /*-------------------------------------------------------------------------*/ |
| 520 | |
| 521 | /* |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 522 | * Root Hub interrupt transfers are polled using a timer if the |
| 523 | * driver requests it; otherwise the driver is responsible for |
| 524 | * calling usb_hcd_poll_rh_status() when an event occurs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | * |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 526 | * Completions are called in_interrupt(), but they may or may not |
| 527 | * be in_irq(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | */ |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 529 | void usb_hcd_poll_rh_status(struct usb_hcd *hcd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
| 531 | struct urb *urb; |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 532 | int length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | unsigned long flags; |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 534 | char buffer[4]; /* Any root hubs with > 31 ports? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 536 | if (!hcd->uses_new_polling && !hcd->status_urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 539 | length = hcd->driver->hub_status_data(hcd, buffer); |
| 540 | if (length > 0) { |
| 541 | |
| 542 | /* try to complete the status urb */ |
| 543 | local_irq_save (flags); |
| 544 | spin_lock(&hcd_root_hub_lock); |
| 545 | urb = hcd->status_urb; |
| 546 | if (urb) { |
| 547 | spin_lock(&urb->lock); |
| 548 | if (urb->status == -EINPROGRESS) { |
| 549 | hcd->poll_pending = 0; |
| 550 | hcd->status_urb = NULL; |
| 551 | urb->status = 0; |
| 552 | urb->hcpriv = NULL; |
| 553 | urb->actual_length = length; |
| 554 | memcpy(urb->transfer_buffer, buffer, length); |
| 555 | } else /* urb has been unlinked */ |
| 556 | length = 0; |
| 557 | spin_unlock(&urb->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } else |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 559 | length = 0; |
| 560 | spin_unlock(&hcd_root_hub_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 562 | /* local irqs are always blocked in completions */ |
| 563 | if (length > 0) |
| 564 | usb_hcd_giveback_urb (hcd, urb, NULL); |
| 565 | else |
| 566 | hcd->poll_pending = 1; |
| 567 | local_irq_restore (flags); |
| 568 | } |
| 569 | |
| 570 | /* The USB 2.0 spec says 256 ms. This is close enough and won't |
| 571 | * exceed that limit if HZ is 100. */ |
| 572 | if (hcd->uses_new_polling ? hcd->poll_rh : |
| 573 | (length == 0 && hcd->status_urb != NULL)) |
| 574 | mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250)); |
| 575 | } |
| 576 | EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status); |
| 577 | |
| 578 | /* timer callback */ |
| 579 | static void rh_timer_func (unsigned long _hcd) |
| 580 | { |
| 581 | usb_hcd_poll_rh_status((struct usb_hcd *) _hcd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | /*-------------------------------------------------------------------------*/ |
| 585 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 586 | static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb) |
| 587 | { |
| 588 | int retval; |
| 589 | unsigned long flags; |
| 590 | int len = 1 + (urb->dev->maxchild / 8); |
| 591 | |
| 592 | spin_lock_irqsave (&hcd_root_hub_lock, flags); |
| 593 | if (urb->status != -EINPROGRESS) /* already unlinked */ |
| 594 | retval = urb->status; |
| 595 | else if (hcd->status_urb || urb->transfer_buffer_length < len) { |
| 596 | dev_dbg (hcd->self.controller, "not queuing rh status urb\n"); |
| 597 | retval = -EINVAL; |
| 598 | } else { |
| 599 | hcd->status_urb = urb; |
| 600 | urb->hcpriv = hcd; /* indicate it's queued */ |
| 601 | |
| 602 | if (!hcd->uses_new_polling) |
| 603 | mod_timer (&hcd->rh_timer, jiffies + |
| 604 | msecs_to_jiffies(250)); |
| 605 | |
| 606 | /* If a status change has already occurred, report it ASAP */ |
| 607 | else if (hcd->poll_pending) |
| 608 | mod_timer (&hcd->rh_timer, jiffies); |
| 609 | retval = 0; |
| 610 | } |
| 611 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); |
| 612 | return retval; |
| 613 | } |
| 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb) |
| 616 | { |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 617 | if (usb_pipeint (urb->pipe)) |
| 618 | return rh_queue_status (hcd, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | if (usb_pipecontrol (urb->pipe)) |
| 620 | return rh_call_control (hcd, urb); |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 621 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /*-------------------------------------------------------------------------*/ |
| 625 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 626 | /* Asynchronous unlinks of root-hub control URBs are legal, but they |
| 627 | * don't do anything. Status URB unlinks must be made in process context |
| 628 | * with interrupts enabled. |
| 629 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb) |
| 631 | { |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 632 | if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */ |
| 633 | if (in_interrupt()) |
| 634 | return 0; /* nothing to do */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | spin_lock_irq(&urb->lock); /* from usb_kill_urb */ |
| 637 | ++urb->reject; |
| 638 | spin_unlock_irq(&urb->lock); |
| 639 | |
| 640 | wait_event(usb_kill_urb_queue, |
| 641 | atomic_read(&urb->use_count) == 0); |
| 642 | |
| 643 | spin_lock_irq(&urb->lock); |
| 644 | --urb->reject; |
| 645 | spin_unlock_irq(&urb->lock); |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 646 | |
| 647 | } else { /* Status URB */ |
| 648 | if (!hcd->uses_new_polling) |
| 649 | del_timer_sync (&hcd->rh_timer); |
| 650 | local_irq_disable (); |
| 651 | spin_lock (&hcd_root_hub_lock); |
| 652 | if (urb == hcd->status_urb) { |
| 653 | hcd->status_urb = NULL; |
| 654 | urb->hcpriv = NULL; |
| 655 | } else |
| 656 | urb = NULL; /* wasn't fully queued */ |
| 657 | spin_unlock (&hcd_root_hub_lock); |
| 658 | if (urb) |
| 659 | usb_hcd_giveback_urb (hcd, urb, NULL); |
| 660 | local_irq_enable (); |
| 661 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | /*-------------------------------------------------------------------------*/ |
| 667 | |
| 668 | /* exported only within usbcore */ |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 669 | struct usb_bus *usb_bus_get(struct usb_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | { |
| 671 | if (bus) |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 672 | kref_get(&bus->kref); |
| 673 | return bus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | } |
| 675 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 676 | static void usb_host_release(struct kref *kref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 678 | struct usb_bus *bus = container_of(kref, struct usb_bus, kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | if (bus->release) |
| 681 | bus->release(bus); |
| 682 | } |
| 683 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 684 | /* exported only within usbcore */ |
| 685 | void usb_bus_put(struct usb_bus *bus) |
| 686 | { |
| 687 | if (bus) |
| 688 | kref_put(&bus->kref, usb_host_release); |
| 689 | } |
| 690 | |
| 691 | /*-------------------------------------------------------------------------*/ |
| 692 | |
| 693 | static struct class *usb_host_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
| 695 | int usb_host_init(void) |
| 696 | { |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 697 | int retval = 0; |
| 698 | |
| 699 | usb_host_class = class_create(THIS_MODULE, "usb_host"); |
| 700 | if (IS_ERR(usb_host_class)) |
| 701 | retval = PTR_ERR(usb_host_class); |
| 702 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | void usb_host_cleanup(void) |
| 706 | { |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 707 | class_destroy(usb_host_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | /** |
| 711 | * usb_bus_init - shared initialization code |
| 712 | * @bus: the bus structure being initialized |
| 713 | * |
| 714 | * This code is used to initialize a usb_bus structure, memory for which is |
| 715 | * separately managed. |
| 716 | */ |
| 717 | static void usb_bus_init (struct usb_bus *bus) |
| 718 | { |
| 719 | memset (&bus->devmap, 0, sizeof(struct usb_devmap)); |
| 720 | |
| 721 | bus->devnum_next = 1; |
| 722 | |
| 723 | bus->root_hub = NULL; |
| 724 | bus->hcpriv = NULL; |
| 725 | bus->busnum = -1; |
| 726 | bus->bandwidth_allocated = 0; |
| 727 | bus->bandwidth_int_reqs = 0; |
| 728 | bus->bandwidth_isoc_reqs = 0; |
| 729 | |
| 730 | INIT_LIST_HEAD (&bus->bus_list); |
| 731 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 732 | kref_init(&bus->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | /** |
| 736 | * usb_alloc_bus - creates a new USB host controller structure |
| 737 | * @op: pointer to a struct usb_operations that this bus structure should use |
| 738 | * Context: !in_interrupt() |
| 739 | * |
| 740 | * Creates a USB host controller bus structure with the specified |
| 741 | * usb_operations and initializes all the necessary internal objects. |
| 742 | * |
| 743 | * If no memory is available, NULL is returned. |
| 744 | * |
| 745 | * The caller should call usb_put_bus() when it is finished with the structure. |
| 746 | */ |
| 747 | struct usb_bus *usb_alloc_bus (struct usb_operations *op) |
| 748 | { |
| 749 | struct usb_bus *bus; |
| 750 | |
| 751 | bus = kmalloc (sizeof *bus, GFP_KERNEL); |
| 752 | if (!bus) |
| 753 | return NULL; |
| 754 | memset(bus, 0, sizeof(struct usb_bus)); |
| 755 | usb_bus_init (bus); |
| 756 | bus->op = op; |
| 757 | return bus; |
| 758 | } |
| 759 | |
| 760 | /*-------------------------------------------------------------------------*/ |
| 761 | |
| 762 | /** |
| 763 | * usb_register_bus - registers the USB host controller with the usb core |
| 764 | * @bus: pointer to the bus to register |
| 765 | * Context: !in_interrupt() |
| 766 | * |
| 767 | * Assigns a bus number, and links the controller into usbcore data |
| 768 | * structures so that it can be seen by scanning the bus list. |
| 769 | */ |
| 770 | static int usb_register_bus(struct usb_bus *bus) |
| 771 | { |
| 772 | int busnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | down (&usb_bus_list_lock); |
| 775 | busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1); |
| 776 | if (busnum < USB_MAXBUS) { |
| 777 | set_bit (busnum, busmap.busmap); |
| 778 | bus->busnum = busnum; |
| 779 | } else { |
| 780 | printk (KERN_ERR "%s: too many buses\n", usbcore_name); |
| 781 | up(&usb_bus_list_lock); |
| 782 | return -E2BIG; |
| 783 | } |
| 784 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 785 | bus->class_dev = class_device_create(usb_host_class, MKDEV(0,0), bus->controller, "usb%d", busnum); |
| 786 | if (IS_ERR(bus->class_dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | clear_bit(busnum, busmap.busmap); |
| 788 | up(&usb_bus_list_lock); |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 789 | return PTR_ERR(bus->class_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | } |
| 791 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 792 | class_set_devdata(bus->class_dev, bus); |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | /* Add it to the local list of buses */ |
| 795 | list_add (&bus->bus_list, &usb_bus_list); |
| 796 | up (&usb_bus_list_lock); |
| 797 | |
| 798 | usbfs_add_bus (bus); |
| 799 | usbmon_notify_bus_add (bus); |
| 800 | |
| 801 | dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum); |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | /** |
| 806 | * usb_deregister_bus - deregisters the USB host controller |
| 807 | * @bus: pointer to the bus to deregister |
| 808 | * Context: !in_interrupt() |
| 809 | * |
| 810 | * Recycles the bus number, and unlinks the controller from usbcore data |
| 811 | * structures so that it won't be seen by scanning the bus list. |
| 812 | */ |
| 813 | static void usb_deregister_bus (struct usb_bus *bus) |
| 814 | { |
| 815 | dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum); |
| 816 | |
| 817 | /* |
| 818 | * NOTE: make sure that all the devices are removed by the |
| 819 | * controller code, as well as having it call this when cleaning |
| 820 | * itself up |
| 821 | */ |
| 822 | down (&usb_bus_list_lock); |
| 823 | list_del (&bus->bus_list); |
| 824 | up (&usb_bus_list_lock); |
| 825 | |
| 826 | usbmon_notify_bus_remove (bus); |
| 827 | usbfs_remove_bus (bus); |
| 828 | |
| 829 | clear_bit (bus->busnum, busmap.busmap); |
| 830 | |
gregkh@suse.de | 8561b10 | 2005-03-15 15:10:13 -0800 | [diff] [blame] | 831 | class_device_unregister(bus->class_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | /** |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 835 | * register_root_hub - called by usb_add_hcd() to register a root hub |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | * @usb_dev: the usb root hub device to be registered. |
| 837 | * @hcd: host controller for this root hub |
| 838 | * |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 839 | * This function registers the root hub with the USB subsystem. It sets up |
| 840 | * the device properly in the device tree and stores the root_hub pointer |
| 841 | * in the bus structure, then calls usb_new_device() to register the usb |
| 842 | * device. It also assigns the root hub's USB address (always 1). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | */ |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 844 | static int register_root_hub (struct usb_device *usb_dev, |
| 845 | struct usb_hcd *hcd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | { |
| 847 | struct device *parent_dev = hcd->self.controller; |
| 848 | const int devnum = 1; |
| 849 | int retval; |
| 850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | usb_dev->devnum = devnum; |
| 852 | usb_dev->bus->devnum_next = devnum + 1; |
| 853 | memset (&usb_dev->bus->devmap.devicemap, 0, |
| 854 | sizeof usb_dev->bus->devmap.devicemap); |
| 855 | set_bit (devnum, usb_dev->bus->devmap.devicemap); |
| 856 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
| 857 | |
| 858 | down (&usb_bus_list_lock); |
| 859 | usb_dev->bus->root_hub = usb_dev; |
| 860 | |
| 861 | usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); |
| 862 | retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE); |
| 863 | if (retval != sizeof usb_dev->descriptor) { |
| 864 | usb_dev->bus->root_hub = NULL; |
| 865 | up (&usb_bus_list_lock); |
| 866 | dev_dbg (parent_dev, "can't read %s device descriptor %d\n", |
| 867 | usb_dev->dev.bus_id, retval); |
| 868 | return (retval < 0) ? retval : -EMSGSIZE; |
| 869 | } |
| 870 | |
| 871 | usb_lock_device (usb_dev); |
| 872 | retval = usb_new_device (usb_dev); |
| 873 | usb_unlock_device (usb_dev); |
| 874 | if (retval) { |
| 875 | usb_dev->bus->root_hub = NULL; |
| 876 | dev_err (parent_dev, "can't register root hub for %s, %d\n", |
| 877 | usb_dev->dev.bus_id, retval); |
| 878 | } |
| 879 | up (&usb_bus_list_lock); |
| 880 | |
| 881 | if (retval == 0) { |
| 882 | spin_lock_irq (&hcd_root_hub_lock); |
| 883 | hcd->rh_registered = 1; |
| 884 | spin_unlock_irq (&hcd_root_hub_lock); |
| 885 | |
| 886 | /* Did the HC die before the root hub was registered? */ |
| 887 | if (hcd->state == HC_STATE_HALT) |
| 888 | usb_hc_died (hcd); /* This time clean up */ |
| 889 | } |
| 890 | |
| 891 | return retval; |
| 892 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 894 | void usb_enable_root_hub_irq (struct usb_bus *bus) |
| 895 | { |
| 896 | struct usb_hcd *hcd; |
| 897 | |
| 898 | hcd = container_of (bus, struct usb_hcd, self); |
| 899 | if (hcd->driver->hub_irq_enable && !hcd->poll_rh && |
| 900 | hcd->state != HC_STATE_HALT) |
| 901 | hcd->driver->hub_irq_enable (hcd); |
| 902 | } |
| 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | /*-------------------------------------------------------------------------*/ |
| 906 | |
| 907 | /** |
| 908 | * usb_calc_bus_time - approximate periodic transaction time in nanoseconds |
| 909 | * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH} |
| 910 | * @is_input: true iff the transaction sends data to the host |
| 911 | * @isoc: true for isochronous transactions, false for interrupt ones |
| 912 | * @bytecount: how many bytes in the transaction. |
| 913 | * |
| 914 | * Returns approximate bus time in nanoseconds for a periodic transaction. |
| 915 | * See USB 2.0 spec section 5.11.3; only periodic transfers need to be |
| 916 | * scheduled in software, this function is only used for such scheduling. |
| 917 | */ |
| 918 | long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount) |
| 919 | { |
| 920 | unsigned long tmp; |
| 921 | |
| 922 | switch (speed) { |
| 923 | case USB_SPEED_LOW: /* INTR only */ |
| 924 | if (is_input) { |
| 925 | tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L; |
| 926 | return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp); |
| 927 | } else { |
| 928 | tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L; |
| 929 | return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp); |
| 930 | } |
| 931 | case USB_SPEED_FULL: /* ISOC or INTR */ |
| 932 | if (isoc) { |
| 933 | tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L; |
| 934 | return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp); |
| 935 | } else { |
| 936 | tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L; |
| 937 | return (9107L + BW_HOST_DELAY + tmp); |
| 938 | } |
| 939 | case USB_SPEED_HIGH: /* ISOC or INTR */ |
| 940 | // FIXME adjust for input vs output |
| 941 | if (isoc) |
| 942 | tmp = HS_USECS (bytecount); |
| 943 | else |
| 944 | tmp = HS_USECS_ISO (bytecount); |
| 945 | return tmp; |
| 946 | default: |
| 947 | pr_debug ("%s: bogus device speed!\n", usbcore_name); |
| 948 | return -1; |
| 949 | } |
| 950 | } |
| 951 | EXPORT_SYMBOL (usb_calc_bus_time); |
| 952 | |
| 953 | /* |
| 954 | * usb_check_bandwidth(): |
| 955 | * |
| 956 | * old_alloc is from host_controller->bandwidth_allocated in microseconds; |
| 957 | * bustime is from calc_bus_time(), but converted to microseconds. |
| 958 | * |
| 959 | * returns <bustime in us> if successful, |
| 960 | * or -ENOSPC if bandwidth request fails. |
| 961 | * |
| 962 | * FIXME: |
| 963 | * This initial implementation does not use Endpoint.bInterval |
| 964 | * in managing bandwidth allocation. |
| 965 | * It probably needs to be expanded to use Endpoint.bInterval. |
| 966 | * This can be done as a later enhancement (correction). |
| 967 | * |
| 968 | * This will also probably require some kind of |
| 969 | * frame allocation tracking...meaning, for example, |
| 970 | * that if multiple drivers request interrupts every 10 USB frames, |
| 971 | * they don't all have to be allocated at |
| 972 | * frame numbers N, N+10, N+20, etc. Some of them could be at |
| 973 | * N+11, N+21, N+31, etc., and others at |
| 974 | * N+12, N+22, N+32, etc. |
| 975 | * |
| 976 | * Similarly for isochronous transfers... |
| 977 | * |
| 978 | * Individual HCDs can schedule more directly ... this logic |
| 979 | * is not correct for high speed transfers. |
| 980 | */ |
| 981 | int usb_check_bandwidth (struct usb_device *dev, struct urb *urb) |
| 982 | { |
| 983 | unsigned int pipe = urb->pipe; |
| 984 | long bustime; |
| 985 | int is_in = usb_pipein (pipe); |
| 986 | int is_iso = usb_pipeisoc (pipe); |
| 987 | int old_alloc = dev->bus->bandwidth_allocated; |
| 988 | int new_alloc; |
| 989 | |
| 990 | |
| 991 | bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso, |
| 992 | usb_maxpacket (dev, pipe, !is_in))); |
| 993 | if (is_iso) |
| 994 | bustime /= urb->number_of_packets; |
| 995 | |
| 996 | new_alloc = old_alloc + (int) bustime; |
| 997 | if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) { |
| 998 | #ifdef DEBUG |
| 999 | char *mode = |
| 1000 | #ifdef CONFIG_USB_BANDWIDTH |
| 1001 | ""; |
| 1002 | #else |
| 1003 | "would have "; |
| 1004 | #endif |
| 1005 | dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n", |
| 1006 | mode, old_alloc, bustime, new_alloc); |
| 1007 | #endif |
| 1008 | #ifdef CONFIG_USB_BANDWIDTH |
| 1009 | bustime = -ENOSPC; /* report error */ |
| 1010 | #endif |
| 1011 | } |
| 1012 | |
| 1013 | return bustime; |
| 1014 | } |
| 1015 | EXPORT_SYMBOL (usb_check_bandwidth); |
| 1016 | |
| 1017 | |
| 1018 | /** |
| 1019 | * usb_claim_bandwidth - records bandwidth for a periodic transfer |
| 1020 | * @dev: source/target of request |
| 1021 | * @urb: request (urb->dev == dev) |
| 1022 | * @bustime: bandwidth consumed, in (average) microseconds per frame |
| 1023 | * @isoc: true iff the request is isochronous |
| 1024 | * |
| 1025 | * Bus bandwidth reservations are recorded purely for diagnostic purposes. |
| 1026 | * HCDs are expected not to overcommit periodic bandwidth, and to record such |
| 1027 | * reservations whenever endpoints are added to the periodic schedule. |
| 1028 | * |
| 1029 | * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's |
| 1030 | * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable |
| 1031 | * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how |
| 1032 | * large its periodic schedule is. |
| 1033 | */ |
| 1034 | void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc) |
| 1035 | { |
| 1036 | dev->bus->bandwidth_allocated += bustime; |
| 1037 | if (isoc) |
| 1038 | dev->bus->bandwidth_isoc_reqs++; |
| 1039 | else |
| 1040 | dev->bus->bandwidth_int_reqs++; |
| 1041 | urb->bandwidth = bustime; |
| 1042 | |
| 1043 | #ifdef USB_BANDWIDTH_MESSAGES |
| 1044 | dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n", |
| 1045 | bustime, |
| 1046 | isoc ? "ISOC" : "INTR", |
| 1047 | dev->bus->bandwidth_allocated, |
| 1048 | dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs); |
| 1049 | #endif |
| 1050 | } |
| 1051 | EXPORT_SYMBOL (usb_claim_bandwidth); |
| 1052 | |
| 1053 | |
| 1054 | /** |
| 1055 | * usb_release_bandwidth - reverses effect of usb_claim_bandwidth() |
| 1056 | * @dev: source/target of request |
| 1057 | * @urb: request (urb->dev == dev) |
| 1058 | * @isoc: true iff the request is isochronous |
| 1059 | * |
| 1060 | * This records that previously allocated bandwidth has been released. |
| 1061 | * Bandwidth is released when endpoints are removed from the host controller's |
| 1062 | * periodic schedule. |
| 1063 | */ |
| 1064 | void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc) |
| 1065 | { |
| 1066 | dev->bus->bandwidth_allocated -= urb->bandwidth; |
| 1067 | if (isoc) |
| 1068 | dev->bus->bandwidth_isoc_reqs--; |
| 1069 | else |
| 1070 | dev->bus->bandwidth_int_reqs--; |
| 1071 | |
| 1072 | #ifdef USB_BANDWIDTH_MESSAGES |
| 1073 | dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n", |
| 1074 | urb->bandwidth, |
| 1075 | isoc ? "ISOC" : "INTR", |
| 1076 | dev->bus->bandwidth_allocated, |
| 1077 | dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs); |
| 1078 | #endif |
| 1079 | urb->bandwidth = 0; |
| 1080 | } |
| 1081 | EXPORT_SYMBOL (usb_release_bandwidth); |
| 1082 | |
| 1083 | |
| 1084 | /*-------------------------------------------------------------------------*/ |
| 1085 | |
| 1086 | /* |
| 1087 | * Generic HC operations. |
| 1088 | */ |
| 1089 | |
| 1090 | /*-------------------------------------------------------------------------*/ |
| 1091 | |
| 1092 | static void urb_unlink (struct urb *urb) |
| 1093 | { |
| 1094 | unsigned long flags; |
| 1095 | |
| 1096 | /* Release any periodic transfer bandwidth */ |
| 1097 | if (urb->bandwidth) |
| 1098 | usb_release_bandwidth (urb->dev, urb, |
| 1099 | usb_pipeisoc (urb->pipe)); |
| 1100 | |
| 1101 | /* clear all state linking urb to this dev (and hcd) */ |
| 1102 | |
| 1103 | spin_lock_irqsave (&hcd_data_lock, flags); |
| 1104 | list_del_init (&urb->urb_list); |
| 1105 | spin_unlock_irqrestore (&hcd_data_lock, flags); |
| 1106 | usb_put_dev (urb->dev); |
| 1107 | } |
| 1108 | |
| 1109 | |
| 1110 | /* may be called in any context with a valid urb->dev usecount |
| 1111 | * caller surrenders "ownership" of urb |
| 1112 | * expects usb_submit_urb() to have sanity checked and conditioned all |
| 1113 | * inputs in the urb |
| 1114 | */ |
Olav Kongas | 5db539e | 2005-06-23 20:25:36 +0300 | [diff] [blame] | 1115 | static int hcd_submit_urb (struct urb *urb, unsigned mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | { |
| 1117 | int status; |
| 1118 | struct usb_hcd *hcd = urb->dev->bus->hcpriv; |
| 1119 | struct usb_host_endpoint *ep; |
| 1120 | unsigned long flags; |
| 1121 | |
| 1122 | if (!hcd) |
| 1123 | return -ENODEV; |
| 1124 | |
| 1125 | usbmon_urb_submit(&hcd->self, urb); |
| 1126 | |
| 1127 | /* |
| 1128 | * Atomically queue the urb, first to our records, then to the HCD. |
| 1129 | * Access to urb->status is controlled by urb->lock ... changes on |
| 1130 | * i/o completion (normal or fault) or unlinking. |
| 1131 | */ |
| 1132 | |
| 1133 | // FIXME: verify that quiescing hc works right (RH cleans up) |
| 1134 | |
| 1135 | spin_lock_irqsave (&hcd_data_lock, flags); |
| 1136 | ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out) |
| 1137 | [usb_pipeendpoint(urb->pipe)]; |
| 1138 | if (unlikely (!ep)) |
| 1139 | status = -ENOENT; |
| 1140 | else if (unlikely (urb->reject)) |
| 1141 | status = -EPERM; |
| 1142 | else switch (hcd->state) { |
| 1143 | case HC_STATE_RUNNING: |
| 1144 | case HC_STATE_RESUMING: |
| 1145 | usb_get_dev (urb->dev); |
| 1146 | list_add_tail (&urb->urb_list, &ep->urb_list); |
| 1147 | status = 0; |
| 1148 | break; |
| 1149 | default: |
| 1150 | status = -ESHUTDOWN; |
| 1151 | break; |
| 1152 | } |
| 1153 | spin_unlock_irqrestore (&hcd_data_lock, flags); |
| 1154 | if (status) { |
| 1155 | INIT_LIST_HEAD (&urb->urb_list); |
| 1156 | usbmon_urb_submit_error(&hcd->self, urb, status); |
| 1157 | return status; |
| 1158 | } |
| 1159 | |
| 1160 | /* increment urb's reference count as part of giving it to the HCD |
| 1161 | * (which now controls it). HCD guarantees that it either returns |
| 1162 | * an error or calls giveback(), but not both. |
| 1163 | */ |
| 1164 | urb = usb_get_urb (urb); |
| 1165 | atomic_inc (&urb->use_count); |
| 1166 | |
| 1167 | if (urb->dev == hcd->self.root_hub) { |
| 1168 | /* NOTE: requirement on hub callers (usbfs and the hub |
| 1169 | * driver, for now) that URBs' urb->transfer_buffer be |
| 1170 | * valid and usb_buffer_{sync,unmap}() not be needed, since |
| 1171 | * they could clobber root hub response data. |
| 1172 | */ |
| 1173 | status = rh_urb_enqueue (hcd, urb); |
| 1174 | goto done; |
| 1175 | } |
| 1176 | |
| 1177 | /* lower level hcd code should use *_dma exclusively, |
| 1178 | * unless it uses pio or talks to another transport. |
| 1179 | */ |
| 1180 | if (hcd->self.controller->dma_mask) { |
| 1181 | if (usb_pipecontrol (urb->pipe) |
| 1182 | && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) |
| 1183 | urb->setup_dma = dma_map_single ( |
| 1184 | hcd->self.controller, |
| 1185 | urb->setup_packet, |
| 1186 | sizeof (struct usb_ctrlrequest), |
| 1187 | DMA_TO_DEVICE); |
| 1188 | if (urb->transfer_buffer_length != 0 |
| 1189 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) |
| 1190 | urb->transfer_dma = dma_map_single ( |
| 1191 | hcd->self.controller, |
| 1192 | urb->transfer_buffer, |
| 1193 | urb->transfer_buffer_length, |
| 1194 | usb_pipein (urb->pipe) |
| 1195 | ? DMA_FROM_DEVICE |
| 1196 | : DMA_TO_DEVICE); |
| 1197 | } |
| 1198 | |
| 1199 | status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags); |
| 1200 | done: |
| 1201 | if (unlikely (status)) { |
| 1202 | urb_unlink (urb); |
| 1203 | atomic_dec (&urb->use_count); |
| 1204 | if (urb->reject) |
| 1205 | wake_up (&usb_kill_urb_queue); |
| 1206 | usb_put_urb (urb); |
| 1207 | usbmon_urb_submit_error(&hcd->self, urb, status); |
| 1208 | } |
| 1209 | return status; |
| 1210 | } |
| 1211 | |
| 1212 | /*-------------------------------------------------------------------------*/ |
| 1213 | |
| 1214 | /* called in any context */ |
| 1215 | static int hcd_get_frame_number (struct usb_device *udev) |
| 1216 | { |
| 1217 | struct usb_hcd *hcd = (struct usb_hcd *)udev->bus->hcpriv; |
| 1218 | if (!HC_IS_RUNNING (hcd->state)) |
| 1219 | return -ESHUTDOWN; |
| 1220 | return hcd->driver->get_frame_number (hcd); |
| 1221 | } |
| 1222 | |
| 1223 | /*-------------------------------------------------------------------------*/ |
| 1224 | |
| 1225 | /* this makes the hcd giveback() the urb more quickly, by kicking it |
| 1226 | * off hardware queues (which may take a while) and returning it as |
| 1227 | * soon as practical. we've already set up the urb's return status, |
| 1228 | * but we can't know if the callback completed already. |
| 1229 | */ |
| 1230 | static int |
| 1231 | unlink1 (struct usb_hcd *hcd, struct urb *urb) |
| 1232 | { |
| 1233 | int value; |
| 1234 | |
| 1235 | if (urb->dev == hcd->self.root_hub) |
| 1236 | value = usb_rh_urb_dequeue (hcd, urb); |
| 1237 | else { |
| 1238 | |
| 1239 | /* The only reason an HCD might fail this call is if |
| 1240 | * it has not yet fully queued the urb to begin with. |
| 1241 | * Such failures should be harmless. */ |
| 1242 | value = hcd->driver->urb_dequeue (hcd, urb); |
| 1243 | } |
| 1244 | |
| 1245 | if (value != 0) |
| 1246 | dev_dbg (hcd->self.controller, "dequeue %p --> %d\n", |
| 1247 | urb, value); |
| 1248 | return value; |
| 1249 | } |
| 1250 | |
| 1251 | /* |
| 1252 | * called in any context |
| 1253 | * |
| 1254 | * caller guarantees urb won't be recycled till both unlink() |
| 1255 | * and the urb's completion function return |
| 1256 | */ |
| 1257 | static int hcd_unlink_urb (struct urb *urb, int status) |
| 1258 | { |
| 1259 | struct usb_host_endpoint *ep; |
| 1260 | struct usb_hcd *hcd = NULL; |
| 1261 | struct device *sys = NULL; |
| 1262 | unsigned long flags; |
| 1263 | struct list_head *tmp; |
| 1264 | int retval; |
| 1265 | |
| 1266 | if (!urb) |
| 1267 | return -EINVAL; |
| 1268 | if (!urb->dev || !urb->dev->bus) |
| 1269 | return -ENODEV; |
| 1270 | ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out) |
| 1271 | [usb_pipeendpoint(urb->pipe)]; |
| 1272 | if (!ep) |
| 1273 | return -ENODEV; |
| 1274 | |
| 1275 | /* |
| 1276 | * we contend for urb->status with the hcd core, |
| 1277 | * which changes it while returning the urb. |
| 1278 | * |
| 1279 | * Caller guaranteed that the urb pointer hasn't been freed, and |
| 1280 | * that it was submitted. But as a rule it can't know whether or |
| 1281 | * not it's already been unlinked ... so we respect the reversed |
| 1282 | * lock sequence needed for the usb_hcd_giveback_urb() code paths |
| 1283 | * (urb lock, then hcd_data_lock) in case some other CPU is now |
| 1284 | * unlinking it. |
| 1285 | */ |
| 1286 | spin_lock_irqsave (&urb->lock, flags); |
| 1287 | spin_lock (&hcd_data_lock); |
| 1288 | |
| 1289 | sys = &urb->dev->dev; |
| 1290 | hcd = urb->dev->bus->hcpriv; |
| 1291 | if (hcd == NULL) { |
| 1292 | retval = -ENODEV; |
| 1293 | goto done; |
| 1294 | } |
| 1295 | |
| 1296 | /* running ~= hc unlink handshake works (irq, timer, etc) |
| 1297 | * halted ~= no unlink handshake is needed |
| 1298 | * suspended, resuming == should never happen |
| 1299 | */ |
| 1300 | WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT); |
| 1301 | |
| 1302 | /* insist the urb is still queued */ |
| 1303 | list_for_each(tmp, &ep->urb_list) { |
| 1304 | if (tmp == &urb->urb_list) |
| 1305 | break; |
| 1306 | } |
| 1307 | if (tmp != &urb->urb_list) { |
| 1308 | retval = -EIDRM; |
| 1309 | goto done; |
| 1310 | } |
| 1311 | |
| 1312 | /* Any status except -EINPROGRESS means something already started to |
| 1313 | * unlink this URB from the hardware. So there's no more work to do. |
| 1314 | */ |
| 1315 | if (urb->status != -EINPROGRESS) { |
| 1316 | retval = -EBUSY; |
| 1317 | goto done; |
| 1318 | } |
| 1319 | |
| 1320 | /* IRQ setup can easily be broken so that USB controllers |
| 1321 | * never get completion IRQs ... maybe even the ones we need to |
| 1322 | * finish unlinking the initial failed usb_set_address() |
| 1323 | * or device descriptor fetch. |
| 1324 | */ |
| 1325 | if (!hcd->saw_irq && hcd->self.root_hub != urb->dev) { |
| 1326 | dev_warn (hcd->self.controller, "Unlink after no-IRQ? " |
| 1327 | "Controller is probably using the wrong IRQ." |
| 1328 | "\n"); |
| 1329 | hcd->saw_irq = 1; |
| 1330 | } |
| 1331 | |
| 1332 | urb->status = status; |
| 1333 | |
| 1334 | spin_unlock (&hcd_data_lock); |
| 1335 | spin_unlock_irqrestore (&urb->lock, flags); |
| 1336 | |
| 1337 | retval = unlink1 (hcd, urb); |
| 1338 | if (retval == 0) |
| 1339 | retval = -EINPROGRESS; |
| 1340 | return retval; |
| 1341 | |
| 1342 | done: |
| 1343 | spin_unlock (&hcd_data_lock); |
| 1344 | spin_unlock_irqrestore (&urb->lock, flags); |
| 1345 | if (retval != -EIDRM && sys && sys->driver) |
| 1346 | dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval); |
| 1347 | return retval; |
| 1348 | } |
| 1349 | |
| 1350 | /*-------------------------------------------------------------------------*/ |
| 1351 | |
| 1352 | /* disables the endpoint: cancels any pending urbs, then synchronizes with |
| 1353 | * the hcd to make sure all endpoint state is gone from hardware. use for |
| 1354 | * set_configuration, set_interface, driver removal, physical disconnect. |
| 1355 | * |
| 1356 | * example: a qh stored in ep->hcpriv, holding state related to endpoint |
| 1357 | * type, maxpacket size, toggle, halt status, and scheduling. |
| 1358 | */ |
| 1359 | static void |
| 1360 | hcd_endpoint_disable (struct usb_device *udev, struct usb_host_endpoint *ep) |
| 1361 | { |
| 1362 | struct usb_hcd *hcd; |
| 1363 | struct urb *urb; |
| 1364 | |
| 1365 | hcd = udev->bus->hcpriv; |
| 1366 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 1367 | WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT && |
| 1368 | udev->state != USB_STATE_NOTATTACHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
| 1370 | local_irq_disable (); |
| 1371 | |
| 1372 | /* FIXME move most of this into message.c as part of its |
| 1373 | * endpoint disable logic |
| 1374 | */ |
| 1375 | |
| 1376 | /* ep is already gone from udev->ep_{in,out}[]; no more submits */ |
| 1377 | rescan: |
| 1378 | spin_lock (&hcd_data_lock); |
| 1379 | list_for_each_entry (urb, &ep->urb_list, urb_list) { |
| 1380 | int tmp; |
| 1381 | |
| 1382 | /* another cpu may be in hcd, spinning on hcd_data_lock |
| 1383 | * to giveback() this urb. the races here should be |
| 1384 | * small, but a full fix needs a new "can't submit" |
| 1385 | * urb state. |
| 1386 | * FIXME urb->reject should allow that... |
| 1387 | */ |
| 1388 | if (urb->status != -EINPROGRESS) |
| 1389 | continue; |
| 1390 | usb_get_urb (urb); |
| 1391 | spin_unlock (&hcd_data_lock); |
| 1392 | |
| 1393 | spin_lock (&urb->lock); |
| 1394 | tmp = urb->status; |
| 1395 | if (tmp == -EINPROGRESS) |
| 1396 | urb->status = -ESHUTDOWN; |
| 1397 | spin_unlock (&urb->lock); |
| 1398 | |
| 1399 | /* kick hcd unless it's already returning this */ |
| 1400 | if (tmp == -EINPROGRESS) { |
| 1401 | tmp = urb->pipe; |
| 1402 | unlink1 (hcd, urb); |
| 1403 | dev_dbg (hcd->self.controller, |
| 1404 | "shutdown urb %p pipe %08x ep%d%s%s\n", |
| 1405 | urb, tmp, usb_pipeendpoint (tmp), |
| 1406 | (tmp & USB_DIR_IN) ? "in" : "out", |
| 1407 | ({ char *s; \ |
| 1408 | switch (usb_pipetype (tmp)) { \ |
| 1409 | case PIPE_CONTROL: s = ""; break; \ |
| 1410 | case PIPE_BULK: s = "-bulk"; break; \ |
| 1411 | case PIPE_INTERRUPT: s = "-intr"; break; \ |
| 1412 | default: s = "-iso"; break; \ |
| 1413 | }; s;})); |
| 1414 | } |
| 1415 | usb_put_urb (urb); |
| 1416 | |
| 1417 | /* list contents may have changed */ |
| 1418 | goto rescan; |
| 1419 | } |
| 1420 | spin_unlock (&hcd_data_lock); |
| 1421 | local_irq_enable (); |
| 1422 | |
| 1423 | /* synchronize with the hardware, so old configuration state |
| 1424 | * clears out immediately (and will be freed). |
| 1425 | */ |
| 1426 | might_sleep (); |
| 1427 | if (hcd->driver->endpoint_disable) |
| 1428 | hcd->driver->endpoint_disable (hcd, ep); |
| 1429 | } |
| 1430 | |
| 1431 | /*-------------------------------------------------------------------------*/ |
| 1432 | |
| 1433 | #ifdef CONFIG_USB_SUSPEND |
| 1434 | |
| 1435 | static int hcd_hub_suspend (struct usb_bus *bus) |
| 1436 | { |
| 1437 | struct usb_hcd *hcd; |
| 1438 | |
| 1439 | hcd = container_of (bus, struct usb_hcd, self); |
| 1440 | if (hcd->driver->hub_suspend) |
| 1441 | return hcd->driver->hub_suspend (hcd); |
| 1442 | return 0; |
| 1443 | } |
| 1444 | |
| 1445 | static int hcd_hub_resume (struct usb_bus *bus) |
| 1446 | { |
| 1447 | struct usb_hcd *hcd; |
| 1448 | |
| 1449 | hcd = container_of (bus, struct usb_hcd, self); |
| 1450 | if (hcd->driver->hub_resume) |
| 1451 | return hcd->driver->hub_resume (hcd); |
| 1452 | return 0; |
| 1453 | } |
| 1454 | |
| 1455 | /** |
| 1456 | * usb_hcd_resume_root_hub - called by HCD to resume its root hub |
| 1457 | * @hcd: host controller for this root hub |
| 1458 | * |
| 1459 | * The USB host controller calls this function when its root hub is |
| 1460 | * suspended (with the remote wakeup feature enabled) and a remote |
| 1461 | * wakeup request is received. It queues a request for khubd to |
| 1462 | * resume the root hub. |
| 1463 | */ |
| 1464 | void usb_hcd_resume_root_hub (struct usb_hcd *hcd) |
| 1465 | { |
| 1466 | unsigned long flags; |
| 1467 | |
| 1468 | spin_lock_irqsave (&hcd_root_hub_lock, flags); |
| 1469 | if (hcd->rh_registered) |
| 1470 | usb_resume_root_hub (hcd->self.root_hub); |
| 1471 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); |
| 1472 | } |
| 1473 | |
| 1474 | #else |
| 1475 | void usb_hcd_resume_root_hub (struct usb_hcd *hcd) |
| 1476 | { |
| 1477 | } |
| 1478 | #endif |
| 1479 | EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub); |
| 1480 | |
| 1481 | /*-------------------------------------------------------------------------*/ |
| 1482 | |
| 1483 | #ifdef CONFIG_USB_OTG |
| 1484 | |
| 1485 | /** |
| 1486 | * usb_bus_start_enum - start immediate enumeration (for OTG) |
| 1487 | * @bus: the bus (must use hcd framework) |
| 1488 | * @port_num: 1-based number of port; usually bus->otg_port |
| 1489 | * Context: in_interrupt() |
| 1490 | * |
| 1491 | * Starts enumeration, with an immediate reset followed later by |
| 1492 | * khubd identifying and possibly configuring the device. |
| 1493 | * This is needed by OTG controller drivers, where it helps meet |
| 1494 | * HNP protocol timing requirements for starting a port reset. |
| 1495 | */ |
| 1496 | int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num) |
| 1497 | { |
| 1498 | struct usb_hcd *hcd; |
| 1499 | int status = -EOPNOTSUPP; |
| 1500 | |
| 1501 | /* NOTE: since HNP can't start by grabbing the bus's address0_sem, |
| 1502 | * boards with root hubs hooked up to internal devices (instead of |
| 1503 | * just the OTG port) may need more attention to resetting... |
| 1504 | */ |
| 1505 | hcd = container_of (bus, struct usb_hcd, self); |
| 1506 | if (port_num && hcd->driver->start_port_reset) |
| 1507 | status = hcd->driver->start_port_reset(hcd, port_num); |
| 1508 | |
| 1509 | /* run khubd shortly after (first) root port reset finishes; |
| 1510 | * it may issue others, until at least 50 msecs have passed. |
| 1511 | */ |
| 1512 | if (status == 0) |
| 1513 | mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10)); |
| 1514 | return status; |
| 1515 | } |
| 1516 | EXPORT_SYMBOL (usb_bus_start_enum); |
| 1517 | |
| 1518 | #endif |
| 1519 | |
| 1520 | /*-------------------------------------------------------------------------*/ |
| 1521 | |
| 1522 | /* |
| 1523 | * usb_hcd_operations - adapts usb_bus framework to HCD framework (bus glue) |
| 1524 | */ |
| 1525 | static struct usb_operations usb_hcd_operations = { |
| 1526 | .get_frame_number = hcd_get_frame_number, |
| 1527 | .submit_urb = hcd_submit_urb, |
| 1528 | .unlink_urb = hcd_unlink_urb, |
| 1529 | .buffer_alloc = hcd_buffer_alloc, |
| 1530 | .buffer_free = hcd_buffer_free, |
| 1531 | .disable = hcd_endpoint_disable, |
| 1532 | #ifdef CONFIG_USB_SUSPEND |
| 1533 | .hub_suspend = hcd_hub_suspend, |
| 1534 | .hub_resume = hcd_hub_resume, |
| 1535 | #endif |
| 1536 | }; |
| 1537 | |
| 1538 | /*-------------------------------------------------------------------------*/ |
| 1539 | |
| 1540 | /** |
| 1541 | * usb_hcd_giveback_urb - return URB from HCD to device driver |
| 1542 | * @hcd: host controller returning the URB |
| 1543 | * @urb: urb being returned to the USB device driver. |
| 1544 | * @regs: pt_regs, passed down to the URB completion handler |
| 1545 | * Context: in_interrupt() |
| 1546 | * |
| 1547 | * This hands the URB from HCD to its USB device driver, using its |
| 1548 | * completion function. The HCD has freed all per-urb resources |
| 1549 | * (and is done using urb->hcpriv). It also released all HCD locks; |
| 1550 | * the device driver won't cause problems if it frees, modifies, |
| 1551 | * or resubmits this URB. |
| 1552 | */ |
| 1553 | void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs) |
| 1554 | { |
| 1555 | int at_root_hub; |
| 1556 | |
| 1557 | at_root_hub = (urb->dev == hcd->self.root_hub); |
| 1558 | urb_unlink (urb); |
| 1559 | |
| 1560 | /* lower level hcd code should use *_dma exclusively */ |
| 1561 | if (hcd->self.controller->dma_mask && !at_root_hub) { |
| 1562 | if (usb_pipecontrol (urb->pipe) |
| 1563 | && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) |
| 1564 | dma_unmap_single (hcd->self.controller, urb->setup_dma, |
| 1565 | sizeof (struct usb_ctrlrequest), |
| 1566 | DMA_TO_DEVICE); |
| 1567 | if (urb->transfer_buffer_length != 0 |
| 1568 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) |
| 1569 | dma_unmap_single (hcd->self.controller, |
| 1570 | urb->transfer_dma, |
| 1571 | urb->transfer_buffer_length, |
| 1572 | usb_pipein (urb->pipe) |
| 1573 | ? DMA_FROM_DEVICE |
| 1574 | : DMA_TO_DEVICE); |
| 1575 | } |
| 1576 | |
| 1577 | usbmon_urb_complete (&hcd->self, urb); |
| 1578 | /* pass ownership to the completion handler */ |
| 1579 | urb->complete (urb, regs); |
| 1580 | atomic_dec (&urb->use_count); |
| 1581 | if (unlikely (urb->reject)) |
| 1582 | wake_up (&usb_kill_urb_queue); |
| 1583 | usb_put_urb (urb); |
| 1584 | } |
| 1585 | EXPORT_SYMBOL (usb_hcd_giveback_urb); |
| 1586 | |
| 1587 | /*-------------------------------------------------------------------------*/ |
| 1588 | |
| 1589 | /** |
| 1590 | * usb_hcd_irq - hook IRQs to HCD framework (bus glue) |
| 1591 | * @irq: the IRQ being raised |
| 1592 | * @__hcd: pointer to the HCD whose IRQ is being signaled |
| 1593 | * @r: saved hardware registers |
| 1594 | * |
| 1595 | * If the controller isn't HALTed, calls the driver's irq handler. |
| 1596 | * Checks whether the controller is now dead. |
| 1597 | */ |
| 1598 | irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r) |
| 1599 | { |
| 1600 | struct usb_hcd *hcd = __hcd; |
| 1601 | int start = hcd->state; |
| 1602 | |
| 1603 | if (start == HC_STATE_HALT) |
| 1604 | return IRQ_NONE; |
| 1605 | if (hcd->driver->irq (hcd, r) == IRQ_NONE) |
| 1606 | return IRQ_NONE; |
| 1607 | |
| 1608 | hcd->saw_irq = 1; |
| 1609 | if (hcd->state != start && hcd->state == HC_STATE_HALT) |
| 1610 | usb_hc_died (hcd); |
| 1611 | return IRQ_HANDLED; |
| 1612 | } |
| 1613 | |
| 1614 | /*-------------------------------------------------------------------------*/ |
| 1615 | |
| 1616 | /** |
| 1617 | * usb_hc_died - report abnormal shutdown of a host controller (bus glue) |
| 1618 | * @hcd: pointer to the HCD representing the controller |
| 1619 | * |
| 1620 | * This is called by bus glue to report a USB host controller that died |
| 1621 | * while operations may still have been pending. It's called automatically |
| 1622 | * by the PCI glue, so only glue for non-PCI busses should need to call it. |
| 1623 | */ |
| 1624 | void usb_hc_died (struct usb_hcd *hcd) |
| 1625 | { |
| 1626 | unsigned long flags; |
| 1627 | |
| 1628 | dev_err (hcd->self.controller, "HC died; cleaning up\n"); |
| 1629 | |
| 1630 | spin_lock_irqsave (&hcd_root_hub_lock, flags); |
| 1631 | if (hcd->rh_registered) { |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 1632 | hcd->poll_rh = 0; |
| 1633 | del_timer(&hcd->rh_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | |
| 1635 | /* make khubd clean up old urbs and devices */ |
| 1636 | usb_set_device_state (hcd->self.root_hub, |
| 1637 | USB_STATE_NOTATTACHED); |
| 1638 | usb_kick_khubd (hcd->self.root_hub); |
| 1639 | } |
| 1640 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); |
| 1641 | } |
| 1642 | EXPORT_SYMBOL_GPL (usb_hc_died); |
| 1643 | |
| 1644 | /*-------------------------------------------------------------------------*/ |
| 1645 | |
| 1646 | static void hcd_release (struct usb_bus *bus) |
| 1647 | { |
| 1648 | struct usb_hcd *hcd; |
| 1649 | |
| 1650 | hcd = container_of(bus, struct usb_hcd, self); |
| 1651 | kfree(hcd); |
| 1652 | } |
| 1653 | |
| 1654 | /** |
| 1655 | * usb_create_hcd - create and initialize an HCD structure |
| 1656 | * @driver: HC driver that will use this hcd |
| 1657 | * @dev: device for this HC, stored in hcd->self.controller |
| 1658 | * @bus_name: value to store in hcd->self.bus_name |
| 1659 | * Context: !in_interrupt() |
| 1660 | * |
| 1661 | * Allocate a struct usb_hcd, with extra space at the end for the |
| 1662 | * HC driver's private data. Initialize the generic members of the |
| 1663 | * hcd structure. |
| 1664 | * |
| 1665 | * If memory is unavailable, returns NULL. |
| 1666 | */ |
| 1667 | struct usb_hcd *usb_create_hcd (const struct hc_driver *driver, |
| 1668 | struct device *dev, char *bus_name) |
| 1669 | { |
| 1670 | struct usb_hcd *hcd; |
| 1671 | |
| 1672 | hcd = kcalloc(1, sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL); |
| 1673 | if (!hcd) { |
| 1674 | dev_dbg (dev, "hcd alloc failed\n"); |
| 1675 | return NULL; |
| 1676 | } |
| 1677 | dev_set_drvdata(dev, hcd); |
| 1678 | |
| 1679 | usb_bus_init(&hcd->self); |
| 1680 | hcd->self.op = &usb_hcd_operations; |
| 1681 | hcd->self.hcpriv = hcd; |
| 1682 | hcd->self.release = &hcd_release; |
| 1683 | hcd->self.controller = dev; |
| 1684 | hcd->self.bus_name = bus_name; |
| 1685 | |
| 1686 | init_timer(&hcd->rh_timer); |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 1687 | hcd->rh_timer.function = rh_timer_func; |
| 1688 | hcd->rh_timer.data = (unsigned long) hcd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | |
| 1690 | hcd->driver = driver; |
| 1691 | hcd->product_desc = (driver->product_desc) ? driver->product_desc : |
| 1692 | "USB Host Controller"; |
| 1693 | |
| 1694 | return hcd; |
| 1695 | } |
| 1696 | EXPORT_SYMBOL (usb_create_hcd); |
| 1697 | |
| 1698 | void usb_put_hcd (struct usb_hcd *hcd) |
| 1699 | { |
| 1700 | dev_set_drvdata(hcd->self.controller, NULL); |
| 1701 | usb_bus_put(&hcd->self); |
| 1702 | } |
| 1703 | EXPORT_SYMBOL (usb_put_hcd); |
| 1704 | |
| 1705 | /** |
| 1706 | * usb_add_hcd - finish generic HCD structure initialization and register |
| 1707 | * @hcd: the usb_hcd structure to initialize |
| 1708 | * @irqnum: Interrupt line to allocate |
| 1709 | * @irqflags: Interrupt type flags |
| 1710 | * |
| 1711 | * Finish the remaining parts of generic HCD initialization: allocate the |
| 1712 | * buffers of consistent memory, register the bus, request the IRQ line, |
| 1713 | * and call the driver's reset() and start() routines. |
| 1714 | */ |
| 1715 | int usb_add_hcd(struct usb_hcd *hcd, |
| 1716 | unsigned int irqnum, unsigned long irqflags) |
| 1717 | { |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1718 | int retval; |
| 1719 | struct usb_device *rhdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | |
| 1721 | dev_info(hcd->self.controller, "%s\n", hcd->product_desc); |
| 1722 | |
| 1723 | /* till now HC has been in an indeterminate state ... */ |
| 1724 | if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) { |
| 1725 | dev_err(hcd->self.controller, "can't reset\n"); |
| 1726 | return retval; |
| 1727 | } |
| 1728 | |
| 1729 | if ((retval = hcd_buffer_create(hcd)) != 0) { |
| 1730 | dev_dbg(hcd->self.controller, "pool alloc failed\n"); |
| 1731 | return retval; |
| 1732 | } |
| 1733 | |
| 1734 | if ((retval = usb_register_bus(&hcd->self)) < 0) |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1735 | goto err_register_bus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | |
| 1737 | if (hcd->driver->irq) { |
| 1738 | char buf[8], *bufp = buf; |
| 1739 | |
| 1740 | #ifdef __sparc__ |
| 1741 | bufp = __irq_itoa(irqnum); |
| 1742 | #else |
| 1743 | sprintf(buf, "%d", irqnum); |
| 1744 | #endif |
| 1745 | |
| 1746 | snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d", |
| 1747 | hcd->driver->description, hcd->self.busnum); |
| 1748 | if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags, |
| 1749 | hcd->irq_descr, hcd)) != 0) { |
| 1750 | dev_err(hcd->self.controller, |
| 1751 | "request interrupt %s failed\n", bufp); |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1752 | goto err_request_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | } |
| 1754 | hcd->irq = irqnum; |
| 1755 | dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp, |
| 1756 | (hcd->driver->flags & HCD_MEMORY) ? |
| 1757 | "io mem" : "io base", |
| 1758 | (unsigned long long)hcd->rsrc_start); |
| 1759 | } else { |
| 1760 | hcd->irq = -1; |
| 1761 | if (hcd->rsrc_start) |
| 1762 | dev_info(hcd->self.controller, "%s 0x%08llx\n", |
| 1763 | (hcd->driver->flags & HCD_MEMORY) ? |
| 1764 | "io mem" : "io base", |
| 1765 | (unsigned long long)hcd->rsrc_start); |
| 1766 | } |
| 1767 | |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1768 | /* Allocate the root hub before calling hcd->driver->start(), |
| 1769 | * but don't register it until afterward so that the hardware |
| 1770 | * is running. |
| 1771 | */ |
| 1772 | if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) { |
| 1773 | dev_err(hcd->self.controller, "unable to allocate root hub\n"); |
| 1774 | retval = -ENOMEM; |
| 1775 | goto err_allocate_root_hub; |
| 1776 | } |
| 1777 | rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH : |
| 1778 | USB_SPEED_FULL; |
| 1779 | |
| 1780 | /* Although in principle hcd->driver->start() might need to use rhdev, |
| 1781 | * none of the current drivers do. |
| 1782 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | if ((retval = hcd->driver->start(hcd)) < 0) { |
| 1784 | dev_err(hcd->self.controller, "startup error %d\n", retval); |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1785 | goto err_hcd_driver_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | } |
| 1787 | |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1788 | /* hcd->driver->start() reported can_wakeup, probably with |
| 1789 | * assistance from board's boot firmware. |
| 1790 | * NOTE: normal devices won't enable wakeup by default. |
| 1791 | */ |
| 1792 | if (hcd->can_wakeup) |
| 1793 | dev_dbg(hcd->self.controller, "supports USB remote wakeup\n"); |
| 1794 | hcd->remote_wakeup = hcd->can_wakeup; |
| 1795 | |
| 1796 | if ((retval = register_root_hub(rhdev, hcd)) != 0) |
| 1797 | goto err_register_root_hub; |
| 1798 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 1799 | if (hcd->uses_new_polling && hcd->poll_rh) |
| 1800 | usb_hcd_poll_rh_status(hcd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | return retval; |
| 1802 | |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1803 | err_register_root_hub: |
| 1804 | hcd->driver->stop(hcd); |
| 1805 | |
| 1806 | err_hcd_driver_start: |
| 1807 | usb_put_dev(rhdev); |
| 1808 | |
| 1809 | err_allocate_root_hub: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | if (hcd->irq >= 0) |
| 1811 | free_irq(irqnum, hcd); |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1812 | |
| 1813 | err_request_irq: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | usb_deregister_bus(&hcd->self); |
Alan Stern | 8ec8d20 | 2005-04-25 11:25:17 -0400 | [diff] [blame] | 1815 | |
| 1816 | err_register_bus: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | hcd_buffer_destroy(hcd); |
| 1818 | return retval; |
| 1819 | } |
| 1820 | EXPORT_SYMBOL (usb_add_hcd); |
| 1821 | |
| 1822 | /** |
| 1823 | * usb_remove_hcd - shutdown processing for generic HCDs |
| 1824 | * @hcd: the usb_hcd structure to remove |
| 1825 | * Context: !in_interrupt() |
| 1826 | * |
| 1827 | * Disconnects the root hub, then reverses the effects of usb_add_hcd(), |
| 1828 | * invoking the HCD's stop() method. |
| 1829 | */ |
| 1830 | void usb_remove_hcd(struct usb_hcd *hcd) |
| 1831 | { |
| 1832 | dev_info(hcd->self.controller, "remove, state %x\n", hcd->state); |
| 1833 | |
| 1834 | if (HC_IS_RUNNING (hcd->state)) |
| 1835 | hcd->state = HC_STATE_QUIESCING; |
| 1836 | |
| 1837 | dev_dbg(hcd->self.controller, "roothub graceful disconnect\n"); |
| 1838 | spin_lock_irq (&hcd_root_hub_lock); |
| 1839 | hcd->rh_registered = 0; |
| 1840 | spin_unlock_irq (&hcd_root_hub_lock); |
| 1841 | usb_disconnect(&hcd->self.root_hub); |
| 1842 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 1843 | hcd->poll_rh = 0; |
| 1844 | del_timer_sync(&hcd->rh_timer); |
| 1845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | hcd->driver->stop(hcd); |
| 1847 | hcd->state = HC_STATE_HALT; |
| 1848 | |
| 1849 | if (hcd->irq >= 0) |
| 1850 | free_irq(hcd->irq, hcd); |
| 1851 | usb_deregister_bus(&hcd->self); |
| 1852 | hcd_buffer_destroy(hcd); |
| 1853 | } |
| 1854 | EXPORT_SYMBOL (usb_remove_hcd); |
| 1855 | |
| 1856 | /*-------------------------------------------------------------------------*/ |
| 1857 | |
Adrian Bunk | 4749f32 | 2005-06-23 11:36:56 +0200 | [diff] [blame] | 1858 | #if defined(CONFIG_USB_MON) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | |
| 1860 | struct usb_mon_operations *mon_ops; |
| 1861 | |
| 1862 | /* |
| 1863 | * The registration is unlocked. |
| 1864 | * We do it this way because we do not want to lock in hot paths. |
| 1865 | * |
| 1866 | * Notice that the code is minimally error-proof. Because usbmon needs |
| 1867 | * symbols from usbcore, usbcore gets referenced and cannot be unloaded first. |
| 1868 | */ |
| 1869 | |
| 1870 | int usb_mon_register (struct usb_mon_operations *ops) |
| 1871 | { |
| 1872 | |
| 1873 | if (mon_ops) |
| 1874 | return -EBUSY; |
| 1875 | |
| 1876 | mon_ops = ops; |
| 1877 | mb(); |
| 1878 | return 0; |
| 1879 | } |
| 1880 | EXPORT_SYMBOL_GPL (usb_mon_register); |
| 1881 | |
| 1882 | void usb_mon_deregister (void) |
| 1883 | { |
| 1884 | |
| 1885 | if (mon_ops == NULL) { |
| 1886 | printk(KERN_ERR "USB: monitor was not registered\n"); |
| 1887 | return; |
| 1888 | } |
| 1889 | mon_ops = NULL; |
| 1890 | mb(); |
| 1891 | } |
| 1892 | EXPORT_SYMBOL_GPL (usb_mon_deregister); |
| 1893 | |
| 1894 | #endif /* CONFIG_USB_MON */ |