1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __LINUX_USB_H 3#define __LINUX_USB_H 4 5#include <linux/mod_devicetable.h> 6#include <linux/usb/ch9.h> 7 8#define USB_MAJOR 180 9#define USB_DEVICE_MAJOR 189 10 11 12#ifdef __KERNEL__ 13 14#include <linux/errno.h> /* for -ENODEV */ 15#include <linux/delay.h> /* for mdelay() */ 16#include <linux/interrupt.h> /* for in_interrupt() */ 17#include <linux/list.h> /* for struct list_head */ 18#include <linux/kref.h> /* for struct kref */ 19#include <linux/device.h> /* for struct device */ 20#include <linux/fs.h> /* for struct file_operations */ 21#include <linux/completion.h> /* for struct completion */ 22#include <linux/sched.h> /* for current && schedule_timeout */ 23#include <linux/mutex.h> /* for struct mutex */ 24#include <linux/pm_runtime.h> /* for runtime PM */ 25 26struct usb_device; 27struct usb_driver; 28struct wusb_dev; 29 30/*-------------------------------------------------------------------------*/ 31 32/* 33 * Host-side wrappers for standard USB descriptors ... these are parsed 34 * from the data provided by devices. Parsing turns them from a flat 35 * sequence of descriptors into a hierarchy: 36 * 37 * - devices have one (usually) or more configs; 38 * - configs have one (often) or more interfaces; 39 * - interfaces have one (usually) or more settings; 40 * - each interface setting has zero or (usually) more endpoints. 41 * - a SuperSpeed endpoint has a companion descriptor 42 * 43 * And there might be other descriptors mixed in with those. 44 * 45 * Devices may also have class-specific or vendor-specific descriptors. 46 */ 47 48struct ep_device; 49 50/** 51 * struct usb_host_endpoint - host-side endpoint descriptor and queue 52 * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder 53 * @ss_ep_comp: SuperSpeed companion descriptor for this endpoint 54 * @ssp_isoc_ep_comp: SuperSpeedPlus isoc companion descriptor for this endpoint 55 * @urb_list: urbs queued to this endpoint; maintained by usbcore 56 * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH) 57 * with one or more transfer descriptors (TDs) per urb 58 * @ep_dev: ep_device for sysfs info 59 * @extra: descriptors following this endpoint in the configuration 60 * @extralen: how many bytes of "extra" are valid 61 * @enabled: URBs may be submitted to this endpoint 62 * @streams: number of USB-3 streams allocated on the endpoint 63 * 64 * USB requests are always queued to a given endpoint, identified by a 65 * descriptor within an active interface in a given USB configuration. 66 */ 67struct usb_host_endpoint { 68 struct usb_endpoint_descriptor desc; 69 struct usb_ss_ep_comp_descriptor ss_ep_comp; 70 struct usb_ssp_isoc_ep_comp_descriptor ssp_isoc_ep_comp; 71 struct list_head urb_list; 72 void *hcpriv; 73 struct ep_device *ep_dev; /* For sysfs info */ 74 75 unsigned char *extra; /* Extra descriptors */ 76 int extralen; 77 int enabled; 78 int streams; 79}; 80 81/* host-side wrapper for one interface setting's parsed descriptors */ 82struct usb_host_interface { 83 struct usb_interface_descriptor desc; 84 85 int extralen; 86 unsigned char *extra; /* Extra descriptors */ 87 88 /* array of desc.bNumEndpoints endpoints associated with this 89 * interface setting. these will be in no particular order. 90 */ 91 struct usb_host_endpoint *endpoint; 92 93 char *string; /* iInterface string, if present */ 94}; 95 96enum usb_interface_condition { 97 USB_INTERFACE_UNBOUND = 0, 98 USB_INTERFACE_BINDING, 99 USB_INTERFACE_BOUND, 100 USB_INTERFACE_UNBINDING, 101}; 102 103int __must_check 104usb_find_common_endpoints(struct usb_host_interface *alt, 105 struct usb_endpoint_descriptor **bulk_in, 106 struct usb_endpoint_descriptor **bulk_out, 107 struct usb_endpoint_descriptor **int_in, 108 struct usb_endpoint_descriptor **int_out); 109 110int __must_check 111usb_find_common_endpoints_reverse(struct usb_host_interface *alt, 112 struct usb_endpoint_descriptor **bulk_in, 113 struct usb_endpoint_descriptor **bulk_out, 114 struct usb_endpoint_descriptor **int_in, 115 struct usb_endpoint_descriptor **int_out); 116 117static inline int __must_check 118usb_find_bulk_in_endpoint(struct usb_host_interface *alt, 119 struct usb_endpoint_descriptor **bulk_in) 120{ 121 return usb_find_common_endpoints(alt, bulk_in, NULL, NULL, NULL); 122} 123 124static inline int __must_check 125usb_find_bulk_out_endpoint(struct usb_host_interface *alt, 126 struct usb_endpoint_descriptor **bulk_out) 127{ 128 return usb_find_common_endpoints(alt, NULL, bulk_out, NULL, NULL); 129} 130 131static inline int __must_check 132usb_find_int_in_endpoint(struct usb_host_interface *alt, 133 struct usb_endpoint_descriptor **int_in) 134{ 135 return usb_find_common_endpoints(alt, NULL, NULL, int_in, NULL); 136} 137 138static inline int __must_check 139usb_find_int_out_endpoint(struct usb_host_interface *alt, 140 struct usb_endpoint_descriptor **int_out) 141{ 142 return usb_find_common_endpoints(alt, NULL, NULL, NULL, int_out); 143} 144 145static inline int __must_check 146usb_find_last_bulk_in_endpoint(struct usb_host_interface *alt, 147 struct usb_endpoint_descriptor **bulk_in) 148{ 149 return usb_find_common_endpoints_reverse(alt, bulk_in, NULL, NULL, NULL); 150} 151 152static inline int __must_check 153usb_find_last_bulk_out_endpoint(struct usb_host_interface *alt, 154 struct usb_endpoint_descriptor **bulk_out) 155{ 156 return usb_find_common_endpoints_reverse(alt, NULL, bulk_out, NULL, NULL); 157} 158 159static inline int __must_check 160usb_find_last_int_in_endpoint(struct usb_host_interface *alt, 161 struct usb_endpoint_descriptor **int_in) 162{ 163 return usb_find_common_endpoints_reverse(alt, NULL, NULL, int_in, NULL); 164} 165 166static inline int __must_check 167usb_find_last_int_out_endpoint(struct usb_host_interface *alt, 168 struct usb_endpoint_descriptor **int_out) 169{ 170 return usb_find_common_endpoints_reverse(alt, NULL, NULL, NULL, int_out); 171} 172 173/** 174 * struct usb_interface - what usb device drivers talk to 175 * @altsetting: array of interface structures, one for each alternate 176 * setting that may be selected. Each one includes a set of 177 * endpoint configurations. They will be in no particular order. 178 * @cur_altsetting: the current altsetting. 179 * @num_altsetting: number of altsettings defined. 180 * @intf_assoc: interface association descriptor 181 * @minor: the minor number assigned to this interface, if this 182 * interface is bound to a driver that uses the USB major number. 183 * If this interface does not use the USB major, this field should 184 * be unused. The driver should set this value in the probe() 185 * function of the driver, after it has been assigned a minor 186 * number from the USB core by calling usb_register_dev(). 187 * @condition: binding state of the interface: not bound, binding 188 * (in probe()), bound to a driver, or unbinding (in disconnect()) 189 * @sysfs_files_created: sysfs attributes exist 190 * @ep_devs_created: endpoint child pseudo-devices exist 191 * @unregistering: flag set when the interface is being unregistered 192 * @needs_remote_wakeup: flag set when the driver requires remote-wakeup 193 * capability during autosuspend. 194 * @needs_altsetting0: flag set when a set-interface request for altsetting 0 195 * has been deferred. 196 * @needs_binding: flag set when the driver should be re-probed or unbound 197 * following a reset or suspend operation it doesn't support. 198 * @authorized: This allows to (de)authorize individual interfaces instead 199 * a whole device in contrast to the device authorization. 200 * @dev: driver model's view of this device 201 * @usb_dev: if an interface is bound to the USB major, this will point 202 * to the sysfs representation for that device. 203 * @reset_ws: Used for scheduling resets from atomic context. 204 * @resetting_device: USB core reset the device, so use alt setting 0 as 205 * current; needs bandwidth alloc after reset. 206 * 207 * USB device drivers attach to interfaces on a physical device. Each 208 * interface encapsulates a single high level function, such as feeding 209 * an audio stream to a speaker or reporting a change in a volume control. 210 * Many USB devices only have one interface. The protocol used to talk to 211 * an interface's endpoints can be defined in a usb "class" specification, 212 * or by a product's vendor. The (default) control endpoint is part of 213 * every interface, but is never listed among the interface's descriptors. 214 * 215 * The driver that is bound to the interface can use standard driver model 216 * calls such as dev_get_drvdata() on the dev member of this structure. 217 * 218 * Each interface may have alternate settings. The initial configuration 219 * of a device sets altsetting 0, but the device driver can change 220 * that setting using usb_set_interface(). Alternate settings are often 221 * used to control the use of periodic endpoints, such as by having 222 * different endpoints use different amounts of reserved USB bandwidth. 223 * All standards-conformant USB devices that use isochronous endpoints 224 * will use them in non-default settings. 225 * 226 * The USB specification says that alternate setting numbers must run from 227 * 0 to one less than the total number of alternate settings. But some 228 * devices manage to mess this up, and the structures aren't necessarily 229 * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to 230 * look up an alternate setting in the altsetting array based on its number. 231 */ 232struct usb_interface { 233 /* array of alternate settings for this interface, 234 * stored in no particular order */ 235 struct usb_host_interface *altsetting; 236 237 struct usb_host_interface *cur_altsetting; /* the currently 238 * active alternate setting */ 239 unsigned num_altsetting; /* number of alternate settings */ 240 241 /* If there is an interface association descriptor then it will list 242 * the associated interfaces */ 243 struct usb_interface_assoc_descriptor *intf_assoc; 244 245 int minor; /* minor number this interface is 246 * bound to */ 247 enum usb_interface_condition condition; /* state of binding */ 248 unsigned sysfs_files_created:1; /* the sysfs attributes exist */ 249 unsigned ep_devs_created:1; /* endpoint "devices" exist */ 250 unsigned unregistering:1; /* unregistration is in progress */ 251 unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */ 252 unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */ 253 unsigned needs_binding:1; /* needs delayed unbind/rebind */ 254 unsigned resetting_device:1; /* true: bandwidth alloc after reset */ 255 unsigned authorized:1; /* used for interface authorization */ 256 257 struct device dev; /* interface specific device info */ 258 struct device *usb_dev; 259 struct work_struct reset_ws; /* for resets in atomic context */ 260}; 261#define to_usb_interface(d) container_of(d, struct usb_interface, dev) 262 263static inline void *usb_get_intfdata(struct usb_interface *intf) 264{ 265 return dev_get_drvdata(&intf->dev); 266} 267 268static inline void usb_set_intfdata(struct usb_interface *intf, void *data) 269{ 270 dev_set_drvdata(&intf->dev, data); 271} 272 273struct usb_interface *usb_get_intf(struct usb_interface *intf); 274void usb_put_intf(struct usb_interface *intf); 275 276/* Hard limit */ 277#define USB_MAXENDPOINTS 30 278/* this maximum is arbitrary */ 279#define USB_MAXINTERFACES 32 280#define USB_MAXIADS (USB_MAXINTERFACES/2) 281 282/* 283 * USB Resume Timer: Every Host controller driver should drive the resume 284 * signalling on the bus for the amount of time defined by this macro. 285 * 286 * That way we will have a 'stable' behavior among all HCDs supported by Linux. 287 * 288 * Note that the USB Specification states we should drive resume for *at least* 289 * 20 ms, but it doesn't give an upper bound. This creates two possible 290 * situations which we want to avoid: 291 * 292 * (a) sometimes an msleep(20) might expire slightly before 20 ms, which causes 293 * us to fail USB Electrical Tests, thus failing Certification 294 * 295 * (b) Some (many) devices actually need more than 20 ms of resume signalling, 296 * and while we can argue that's against the USB Specification, we don't have 297 * control over which devices a certification laboratory will be using for 298 * certification. If CertLab uses a device which was tested against Windows and 299 * that happens to have relaxed resume signalling rules, we might fall into 300 * situations where we fail interoperability and electrical tests. 301 * 302 * In order to avoid both conditions, we're using a 40 ms resume timeout, which 303 * should cope with both LPJ calibration errors and devices not following every 304 * detail of the USB Specification. 305 */ 306#define USB_RESUME_TIMEOUT 40 /* ms */ 307 308/** 309 * struct usb_interface_cache - long-term representation of a device interface 310 * @num_altsetting: number of altsettings defined. 311 * @ref: reference counter. 312 * @altsetting: variable-length array of interface structures, one for 313 * each alternate setting that may be selected. Each one includes a 314 * set of endpoint configurations. They will be in no particular order. 315 * 316 * These structures persist for the lifetime of a usb_device, unlike 317 * struct usb_interface (which persists only as long as its configuration 318 * is installed). The altsetting arrays can be accessed through these 319 * structures at any time, permitting comparison of configurations and 320 * providing support for the /sys/kernel/debug/usb/devices pseudo-file. 321 */ 322struct usb_interface_cache { 323 unsigned num_altsetting; /* number of alternate settings */ 324 struct kref ref; /* reference counter */ 325 326 /* variable-length array of alternate settings for this interface, 327 * stored in no particular order */ 328 struct usb_host_interface altsetting[0]; 329}; 330#define ref_to_usb_interface_cache(r) \ 331 container_of(r, struct usb_interface_cache, ref) 332#define altsetting_to_usb_interface_cache(a) \ 333 container_of(a, struct usb_interface_cache, altsetting[0]) 334 335/** 336 * struct usb_host_config - representation of a device's configuration 337 * @desc: the device's configuration descriptor. 338 * @string: pointer to the cached version of the iConfiguration string, if 339 * present for this configuration. 340 * @intf_assoc: list of any interface association descriptors in this config 341 * @interface: array of pointers to usb_interface structures, one for each 342 * interface in the configuration. The number of interfaces is stored 343 * in desc.bNumInterfaces. These pointers are valid only while the 344 * the configuration is active. 345 * @intf_cache: array of pointers to usb_interface_cache structures, one 346 * for each interface in the configuration. These structures exist 347 * for the entire life of the device. 348 * @extra: pointer to buffer containing all extra descriptors associated 349 * with this configuration (those preceding the first interface 350 * descriptor). 351 * @extralen: length of the extra descriptors buffer. 352 * 353 * USB devices may have multiple configurations, but only one can be active 354 * at any time. Each encapsulates a different operational environment; 355 * for example, a dual-speed device would have separate configurations for 356 * full-speed and high-speed operation. The number of configurations 357 * available is stored in the device descriptor as bNumConfigurations. 358 * 359 * A configuration can contain multiple interfaces. Each corresponds to 360 * a different function of the USB device, and all are available whenever 361 * the configuration is active. The USB standard says that interfaces 362 * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot 363 * of devices get this wrong. In addition, the interface array is not 364 * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to 365 * look up an interface entry based on its number. 366 * 367 * Device drivers should not attempt to activate configurations. The choice 368 * of which configuration to install is a policy decision based on such 369 * considerations as available power, functionality provided, and the user's 370 * desires (expressed through userspace tools). However, drivers can call 371 * usb_reset_configuration() to reinitialize the current configuration and 372 * all its interfaces. 373 */ 374struct usb_host_config { 375 struct usb_config_descriptor desc; 376 377 char *string; /* iConfiguration string, if present */ 378 379 /* List of any Interface Association Descriptors in this 380 * configuration. */ 381 struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS]; 382 383 /* the interfaces associated with this configuration, 384 * stored in no particular order */ 385 struct usb_interface *interface[USB_MAXINTERFACES]; 386 387 /* Interface information available even when this is not the 388 * active configuration */ 389 struct usb_interface_cache *intf_cache[USB_MAXINTERFACES]; 390 391 unsigned char *extra; /* Extra descriptors */ 392 int extralen; 393}; 394 395/* USB2.0 and USB3.0 device BOS descriptor set */ 396struct usb_host_bos { 397 struct usb_bos_descriptor *desc; 398 399 /* wireless cap descriptor is handled by wusb */ 400 struct usb_ext_cap_descriptor *ext_cap; 401 struct usb_ss_cap_descriptor *ss_cap; 402 struct usb_ssp_cap_descriptor *ssp_cap; 403 struct usb_ss_container_id_descriptor *ss_id; 404 struct usb_ptm_cap_descriptor *ptm_cap; 405}; 406 407int __usb_get_extra_descriptor(char *buffer, unsigned size, 408 unsigned char type, void **ptr, size_t min); 409#define usb_get_extra_descriptor(ifpoint, type, ptr) \ 410 __usb_get_extra_descriptor((ifpoint)->extra, \ 411 (ifpoint)->extralen, \ 412 type, (void **)ptr, sizeof(**(ptr))) 413 414/* ----------------------------------------------------------------------- */ 415 416/* USB device number allocation bitmap */ 417struct usb_devmap { 418 unsigned long devicemap[128 / (8*sizeof(unsigned long))]; 419}; 420 421/* 422 * Allocated per bus (tree of devices) we have: 423 */ 424struct usb_bus { 425 struct device *controller; /* host/master side hardware */ 426 struct device *sysdev; /* as seen from firmware or bus */ 427 int busnum; /* Bus number (in order of reg) */ 428 const char *bus_name; /* stable id (PCI slot_name etc) */ 429 u8 uses_dma; /* Does the host controller use DMA? */ 430 u8 uses_pio_for_control; /* 431 * Does the host controller use PIO 432 * for control transfers? 433 */ 434 u8 otg_port; /* 0, or number of OTG/HNP port */ 435 unsigned is_b_host:1; /* true during some HNP roleswitches */ 436 unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */ 437 unsigned no_stop_on_short:1; /* 438 * Quirk: some controllers don't stop 439 * the ep queue on a short transfer 440 * with the URB_SHORT_NOT_OK flag set. 441 */ 442 unsigned no_sg_constraint:1; /* no sg constraint */ 443 unsigned sg_tablesize; /* 0 or largest number of sg list entries */ 444 445 int devnum_next; /* Next open device number in 446 * round-robin allocation */ 447 struct mutex devnum_next_mutex; /* devnum_next mutex */ 448 449 struct usb_devmap devmap; /* device address allocation map */ 450 struct usb_device *root_hub; /* Root hub */ 451 struct usb_bus *hs_companion; /* Companion EHCI bus, if any */ 452 453 int bandwidth_allocated; /* on this bus: how much of the time 454 * reserved for periodic (intr/iso) 455 * requests is used, on average? 456 * Units: microseconds/frame. 457 * Limits: Full/low speed reserve 90%, 458 * while high speed reserves 80%. 459 */ 460 int bandwidth_int_reqs; /* number of Interrupt requests */ 461 int bandwidth_isoc_reqs; /* number of Isoc. requests */ 462 463 unsigned resuming_ports; /* bit array: resuming root-hub ports */ 464 465#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE) 466 struct mon_bus *mon_bus; /* non-null when associated */ 467 int monitored; /* non-zero when monitored */ 468#endif 469}; 470 471struct usb_dev_state; 472 473/* ----------------------------------------------------------------------- */ 474 475struct usb_tt; 476 477enum usb_device_removable { 478 USB_DEVICE_REMOVABLE_UNKNOWN = 0, 479 USB_DEVICE_REMOVABLE, 480 USB_DEVICE_FIXED, 481}; 482 483enum usb_port_connect_type { 484 USB_PORT_CONNECT_TYPE_UNKNOWN = 0, 485 USB_PORT_CONNECT_TYPE_HOT_PLUG, 486 USB_PORT_CONNECT_TYPE_HARD_WIRED, 487 USB_PORT_NOT_USED, 488}; 489 490/* 491 * USB port quirks. 492 */ 493 494/* For the given port, prefer the old (faster) enumeration scheme. */ 495#define USB_PORT_QUIRK_OLD_SCHEME BIT(0) 496 497/* Decrease TRSTRCY to 10ms during device enumeration. */ 498#define USB_PORT_QUIRK_FAST_ENUM BIT(1) 499 500/* 501 * USB 2.0 Link Power Management (LPM) parameters. 502 */ 503struct usb2_lpm_parameters { 504 /* Best effort service latency indicate how long the host will drive 505 * resume on an exit from L1. 506 */ 507 unsigned int besl; 508 509 /* Timeout value in microseconds for the L1 inactivity (LPM) timer. 510 * When the timer counts to zero, the parent hub will initiate a LPM 511 * transition to L1. 512 */ 513 int timeout; 514}; 515 516/* 517 * USB 3.0 Link Power Management (LPM) parameters. 518 * 519 * PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit. 520 * MEL is the USB 3.0 Link PM latency for host-initiated LPM exit. 521 * All three are stored in nanoseconds. 522 */ 523struct usb3_lpm_parameters { 524 /* 525 * Maximum exit latency (MEL) for the host to send a packet to the 526 * device (either a Ping for isoc endpoints, or a data packet for 527 * interrupt endpoints), the hubs to decode the packet, and for all hubs 528 * in the path to transition the links to U0. 529 */ 530 unsigned int mel; 531 /* 532 * Maximum exit latency for a device-initiated LPM transition to bring 533 * all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB 534 * 3.0 spec, with no explanation of what "P" stands for. "Path"? 535 */ 536 unsigned int pel; 537 538 /* 539 * The System Exit Latency (SEL) includes PEL, and three other 540 * latencies. After a device initiates a U0 transition, it will take 541 * some time from when the device sends the ERDY to when it will finally 542 * receive the data packet. Basically, SEL should be the worse-case 543 * latency from when a device starts initiating a U0 transition to when 544 * it will get data. 545 */ 546 unsigned int sel; 547 /* 548 * The idle timeout value that is currently programmed into the parent 549 * hub for this device. When the timer counts to zero, the parent hub 550 * will initiate an LPM transition to either U1 or U2. 551 */ 552 int timeout; 553}; 554 555/** 556 * struct usb_device - kernel's representation of a USB device 557 * @devnum: device number; address on a USB bus 558 * @devpath: device ID string for use in messages (e.g., /port/...) 559 * @route: tree topology hex string for use with xHCI 560 * @state: device state: configured, not attached, etc. 561 * @speed: device speed: high/full/low (or error) 562 * @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support 563 * @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support 564 * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub 565 * @ttport: device port on that tt hub 566 * @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints 567 * @parent: our hub, unless we're the root 568 * @bus: bus we're part of 569 * @ep0: endpoint 0 data (default control pipe) 570 * @dev: generic device interface 571 * @descriptor: USB device descriptor 572 * @bos: USB device BOS descriptor set 573 * @config: all of the device's configs 574 * @actconfig: the active configuration 575 * @ep_in: array of IN endpoints 576 * @ep_out: array of OUT endpoints 577 * @rawdescriptors: raw descriptors for each config 578 * @bus_mA: Current available from the bus 579 * @portnum: parent port number (origin 1) 580 * @level: number of USB hub ancestors 581 * @can_submit: URBs may be submitted 582 * @persist_enabled: USB_PERSIST enabled for this device 583 * @have_langid: whether string_langid is valid 584 * @authorized: policy has said we can use it; 585 * (user space) policy determines if we authorize this device to be 586 * used or not. By default, wired USB devices are authorized. 587 * WUSB devices are not, until we authorize them from user space. 588 * FIXME -- complete doc 589 * @authenticated: Crypto authentication passed 590 * @wusb: device is Wireless USB 591 * @lpm_capable: device supports LPM 592 * @usb2_hw_lpm_capable: device can perform USB2 hardware LPM 593 * @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM 594 * @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled 595 * @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled 596 * @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled 597 * @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled 598 * @string_langid: language ID for strings 599 * @product: iProduct string, if present (static) 600 * @manufacturer: iManufacturer string, if present (static) 601 * @serial: iSerialNumber string, if present (static) 602 * @filelist: usbfs files that are open to this device 603 * @maxchild: number of ports if hub 604 * @quirks: quirks of the whole device 605 * @urbnum: number of URBs submitted for the whole device 606 * @active_duration: total time device is not suspended 607 * @connect_time: time device was first connected 608 * @do_remote_wakeup: remote wakeup should be enabled 609 * @reset_resume: needs reset instead of resume 610 * @port_is_suspended: the upstream port is suspended (L2 or U3) 611 * @wusb_dev: if this is a Wireless USB device, link to the WUSB 612 * specific data for the device. 613 * @slot_id: Slot ID assigned by xHCI 614 * @removable: Device can be physically removed from this port 615 * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout. 616 * @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout. 617 * @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout. 618 * @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm() 619 * to keep track of the number of functions that require USB 3.0 Link Power 620 * Management to be disabled for this usb_device. This count should only 621 * be manipulated by those functions, with the bandwidth_mutex is held. 622 * @hub_delay: cached value consisting of: 623 * parent->hub_delay + wHubDelay + tTPTransmissionDelay (40ns) 624 * 625 * Will be used as wValue for SetIsochDelay requests. 626 * 627 * Notes: 628 * Usbcore drivers should not set usbdev->state directly. Instead use 629 * usb_set_device_state(). 630 */ 631struct usb_device { 632 int devnum; 633 char devpath[16]; 634 u32 route; 635 enum usb_device_state state; 636 enum usb_device_speed speed; 637 unsigned int rx_lanes; 638 unsigned int tx_lanes; 639 640 struct usb_tt *tt; 641 int ttport; 642 643 unsigned int toggle[2]; 644 645 struct usb_device *parent; 646 struct usb_bus *bus; 647 struct usb_host_endpoint ep0; 648 649 struct device dev; 650 651 struct usb_device_descriptor descriptor; 652 struct usb_host_bos *bos; 653 struct usb_host_config *config; 654 655 struct usb_host_config *actconfig; 656 struct usb_host_endpoint *ep_in[16]; 657 struct usb_host_endpoint *ep_out[16]; 658 659 char **rawdescriptors; 660 661 unsigned short bus_mA; 662 u8 portnum; 663 u8 level; 664 665 unsigned can_submit:1; 666 unsigned persist_enabled:1; 667 unsigned have_langid:1; 668 unsigned authorized:1; 669 unsigned authenticated:1; 670 unsigned wusb:1; 671 unsigned lpm_capable:1; 672 unsigned usb2_hw_lpm_capable:1; 673 unsigned usb2_hw_lpm_besl_capable:1; 674 unsigned usb2_hw_lpm_enabled:1; 675 unsigned usb2_hw_lpm_allowed:1; 676 unsigned usb3_lpm_u1_enabled:1; 677 unsigned usb3_lpm_u2_enabled:1; 678 int string_langid; 679 680 /* static strings from the device */ 681 char *product; 682 char *manufacturer; 683 char *serial; 684 685 struct list_head filelist; 686 687 int maxchild; 688 689 u32 quirks; 690 atomic_t urbnum; 691 692 unsigned long active_duration; 693 694#ifdef CONFIG_PM 695 unsigned long connect_time; 696 697 unsigned do_remote_wakeup:1; 698 unsigned reset_resume:1; 699 unsigned port_is_suspended:1; 700#endif 701 struct wusb_dev *wusb_dev; 702 int slot_id; 703 enum usb_device_removable removable; 704 struct usb2_lpm_parameters l1_params; 705 struct usb3_lpm_parameters u1_params; 706 struct usb3_lpm_parameters u2_params; 707 unsigned lpm_disable_count; 708 709 u16 hub_delay; 710}; 711#define to_usb_device(d) container_of(d, struct usb_device, dev) 712 713static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf) 714{ 715 return to_usb_device(intf->dev.parent); 716} 717 718extern struct usb_device *usb_get_dev(struct usb_device *dev); 719extern void usb_put_dev(struct usb_device *dev); 720extern struct usb_device *usb_hub_find_child(struct usb_device *hdev, 721 int port1); 722 723/** 724 * usb_hub_for_each_child - iterate over all child devices on the hub 725 * @hdev: USB device belonging to the usb hub 726 * @port1: portnum associated with child device 727 * @child: child device pointer 728 */ 729#define usb_hub_for_each_child(hdev, port1, child) \ 730 for (port1 = 1, child = usb_hub_find_child(hdev, port1); \ 731 port1 <= hdev->maxchild; \ 732 child = usb_hub_find_child(hdev, ++port1)) \ 733 if (!child) continue; else 734 735/* USB device locking */ 736#define usb_lock_device(udev) device_lock(&(udev)->dev) 737#define usb_unlock_device(udev) device_unlock(&(udev)->dev) 738#define usb_lock_device_interruptible(udev) device_lock_interruptible(&(udev)->dev) 739#define usb_trylock_device(udev) device_trylock(&(udev)->dev) 740extern int usb_lock_device_for_reset(struct usb_device *udev, 741 const struct usb_interface *iface); 742 743/* USB port reset for device reinitialization */ 744extern int usb_reset_device(struct usb_device *dev); 745extern void usb_queue_reset_device(struct usb_interface *dev); 746 747#ifdef CONFIG_ACPI 748extern int usb_acpi_set_power_state(struct usb_device *hdev, int index, 749 bool enable); 750extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index); 751#else 752static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index, 753 bool enable) { return 0; } 754static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index) 755 { return true; } 756#endif 757 758/* USB autosuspend and autoresume */ 759#ifdef CONFIG_PM 760extern void usb_enable_autosuspend(struct usb_device *udev); 761extern void usb_disable_autosuspend(struct usb_device *udev); 762 763extern int usb_autopm_get_interface(struct usb_interface *intf); 764extern void usb_autopm_put_interface(struct usb_interface *intf); 765extern int usb_autopm_get_interface_async(struct usb_interface *intf); 766extern void usb_autopm_put_interface_async(struct usb_interface *intf); 767extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf); 768extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf); 769 770static inline void usb_mark_last_busy(struct usb_device *udev) 771{ 772 pm_runtime_mark_last_busy(&udev->dev); 773} 774 775#else 776 777static inline int usb_enable_autosuspend(struct usb_device *udev) 778{ return 0; } 779static inline int usb_disable_autosuspend(struct usb_device *udev) 780{ return 0; } 781 782static inline int usb_autopm_get_interface(struct usb_interface *intf) 783{ return 0; } 784static inline int usb_autopm_get_interface_async(struct usb_interface *intf) 785{ return 0; } 786 787static inline void usb_autopm_put_interface(struct usb_interface *intf) 788{ } 789static inline void usb_autopm_put_interface_async(struct usb_interface *intf) 790{ } 791static inline void usb_autopm_get_interface_no_resume( 792 struct usb_interface *intf) 793{ } 794static inline void usb_autopm_put_interface_no_suspend( 795 struct usb_interface *intf) 796{ } 797static inline void usb_mark_last_busy(struct usb_device *udev) 798{ } 799#endif 800 801extern int usb_disable_lpm(struct usb_device *udev); 802extern void usb_enable_lpm(struct usb_device *udev); 803/* Same as above, but these functions lock/unlock the bandwidth_mutex. */ 804extern int usb_unlocked_disable_lpm(struct usb_device *udev); 805extern void usb_unlocked_enable_lpm(struct usb_device *udev); 806 807extern int usb_disable_ltm(struct usb_device *udev); 808extern void usb_enable_ltm(struct usb_device *udev); 809 810static inline bool usb_device_supports_ltm(struct usb_device *udev) 811{ 812 if (udev->speed < USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) 813 return false; 814 return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; 815} 816 817static inline bool usb_device_no_sg_constraint(struct usb_device *udev) 818{ 819 return udev && udev->bus && udev->bus->no_sg_constraint; 820} 821 822 823/*-------------------------------------------------------------------------*/ 824 825/* for drivers using iso endpoints */ 826extern int usb_get_current_frame_number(struct usb_device *usb_dev); 827 828/* Sets up a group of bulk endpoints to support multiple stream IDs. */ 829extern int usb_alloc_streams(struct usb_interface *interface, 830 struct usb_host_endpoint **eps, unsigned int num_eps, 831 unsigned int num_streams, gfp_t mem_flags); 832 833/* Reverts a group of bulk endpoints back to not using stream IDs. */ 834extern int usb_free_streams(struct usb_interface *interface, 835 struct usb_host_endpoint **eps, unsigned int num_eps, 836 gfp_t mem_flags); 837 838/* used these for multi-interface device registration */ 839extern int usb_driver_claim_interface(struct usb_driver *driver, 840 struct usb_interface *iface, void *priv); 841 842/** 843 * usb_interface_claimed - returns true iff an interface is claimed 844 * @iface: the interface being checked 845 * 846 * Return: %true (nonzero) iff the interface is claimed, else %false 847 * (zero). 848 * 849 * Note: 850 * Callers must own the driver model's usb bus readlock. So driver 851 * probe() entries don't need extra locking, but other call contexts 852 * may need to explicitly claim that lock. 853 * 854 */ 855static inline int usb_interface_claimed(struct usb_interface *iface) 856{ 857 return (iface->dev.driver != NULL); 858} 859 860extern void usb_driver_release_interface(struct usb_driver *driver, 861 struct usb_interface *iface); 862const struct usb_device_id *usb_match_id(struct usb_interface *interface, 863 const struct usb_device_id *id); 864extern int usb_match_one_id(struct usb_interface *interface, 865 const struct usb_device_id *id); 866 867extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)); 868extern struct usb_interface *usb_find_interface(struct usb_driver *drv, 869 int minor); 870extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, 871 unsigned ifnum); 872extern struct usb_host_interface *usb_altnum_to_altsetting( 873 const struct usb_interface *intf, unsigned int altnum); 874extern struct usb_host_interface *usb_find_alt_setting( 875 struct usb_host_config *config, 876 unsigned int iface_num, 877 unsigned int alt_num); 878 879/* port claiming functions */ 880int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 881 struct usb_dev_state *owner); 882int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 883 struct usb_dev_state *owner); 884 885/** 886 * usb_make_path - returns stable device path in the usb tree 887 * @dev: the device whose path is being constructed 888 * @buf: where to put the string 889 * @size: how big is "buf"? 890 * 891 * Return: Length of the string (> 0) or negative if size was too small. 892 * 893 * Note: 894 * This identifier is intended to be "stable", reflecting physical paths in 895 * hardware such as physical bus addresses for host controllers or ports on 896 * USB hubs. That makes it stay the same until systems are physically 897 * reconfigured, by re-cabling a tree of USB devices or by moving USB host 898 * controllers. Adding and removing devices, including virtual root hubs 899 * in host controller driver modules, does not change these path identifiers; 900 * neither does rebooting or re-enumerating. These are more useful identifiers 901 * than changeable ("unstable") ones like bus numbers or device addresses. 902 * 903 * With a partial exception for devices connected to USB 2.0 root hubs, these 904 * identifiers are also predictable. So long as the device tree isn't changed, 905 * plugging any USB device into a given hub port always gives it the same path. 906 * Because of the use of "companion" controllers, devices connected to ports on 907 * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are 908 * high speed, and a different one if they are full or low speed. 909 */ 910static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size) 911{ 912 int actual; 913 actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name, 914 dev->devpath); 915 return (actual >= (int)size) ? -1 : actual; 916} 917 918/*-------------------------------------------------------------------------*/ 919 920#define USB_DEVICE_ID_MATCH_DEVICE \ 921 (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT) 922#define USB_DEVICE_ID_MATCH_DEV_RANGE \ 923 (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI) 924#define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \ 925 (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE) 926#define USB_DEVICE_ID_MATCH_DEV_INFO \ 927 (USB_DEVICE_ID_MATCH_DEV_CLASS | \ 928 USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \ 929 USB_DEVICE_ID_MATCH_DEV_PROTOCOL) 930#define USB_DEVICE_ID_MATCH_INT_INFO \ 931 (USB_DEVICE_ID_MATCH_INT_CLASS | \ 932 USB_DEVICE_ID_MATCH_INT_SUBCLASS | \ 933 USB_DEVICE_ID_MATCH_INT_PROTOCOL) 934 935/** 936 * USB_DEVICE - macro used to describe a specific usb device 937 * @vend: the 16 bit USB Vendor ID 938 * @prod: the 16 bit USB Product ID 939 * 940 * This macro is used to create a struct usb_device_id that matches a 941 * specific device. 942 */ 943#define USB_DEVICE(vend, prod) \ 944 .match_flags = USB_DEVICE_ID_MATCH_DEVICE, \ 945 .idVendor = (vend), \ 946 .idProduct = (prod) 947/** 948 * USB_DEVICE_VER - describe a specific usb device with a version range 949 * @vend: the 16 bit USB Vendor ID 950 * @prod: the 16 bit USB Product ID 951 * @lo: the bcdDevice_lo value 952 * @hi: the bcdDevice_hi value 953 * 954 * This macro is used to create a struct usb_device_id that matches a 955 * specific device, with a version range. 956 */ 957#define USB_DEVICE_VER(vend, prod, lo, hi) \ 958 .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \ 959 .idVendor = (vend), \ 960 .idProduct = (prod), \ 961 .bcdDevice_lo = (lo), \ 962 .bcdDevice_hi = (hi) 963 964/** 965 * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class 966 * @vend: the 16 bit USB Vendor ID 967 * @prod: the 16 bit USB Product ID 968 * @cl: bInterfaceClass value 969 * 970 * This macro is used to create a struct usb_device_id that matches a 971 * specific interface class of devices. 972 */ 973#define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \ 974 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ 975 USB_DEVICE_ID_MATCH_INT_CLASS, \ 976 .idVendor = (vend), \ 977 .idProduct = (prod), \ 978 .bInterfaceClass = (cl) 979 980/** 981 * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol 982 * @vend: the 16 bit USB Vendor ID 983 * @prod: the 16 bit USB Product ID 984 * @pr: bInterfaceProtocol value 985 * 986 * This macro is used to create a struct usb_device_id that matches a 987 * specific interface protocol of devices. 988 */ 989#define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \ 990 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ 991 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ 992 .idVendor = (vend), \ 993 .idProduct = (prod), \ 994 .bInterfaceProtocol = (pr) 995 996/** 997 * USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number 998 * @vend: the 16 bit USB Vendor ID 999 * @prod: the 16 bit USB Product ID 1000 * @num: bInterfaceNumber value
1001 * 1002 * This macro is used to create a struct usb_device_id that matches a 1003 * specific interface number of devices. 1004 */ 1005#define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \ 1006 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ 1007 USB_DEVICE_ID_MATCH_INT_NUMBER, \ 1008 .idVendor = (vend), \ 1009 .idProduct = (prod), \ 1010 .bInterfaceNumber = (num) 1011 1012/** 1013 * USB_DEVICE_INFO - macro used to describe a class of usb devices 1014 * @cl: bDeviceClass value 1015 * @sc: bDeviceSubClass value 1016 * @pr: bDeviceProtocol value 1017 * 1018 * This macro is used to create a struct usb_device_id that matches a 1019 * specific class of devices. 1020 */ 1021#define USB_DEVICE_INFO(cl, sc, pr) \ 1022 .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \ 1023 .bDeviceClass = (cl), \ 1024 .bDeviceSubClass = (sc), \ 1025 .bDeviceProtocol = (pr) 1026 1027/** 1028 * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces 1029 * @cl: bInterfaceClass value 1030 * @sc: bInterfaceSubClass value 1031 * @pr: bInterfaceProtocol value 1032 * 1033 * This macro is used to create a struct usb_device_id that matches a 1034 * specific class of interfaces. 1035 */ 1036#define USB_INTERFACE_INFO(cl, sc, pr) \ 1037 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \ 1038 .bInterfaceClass = (cl), \ 1039 .bInterfaceSubClass = (sc), \ 1040 .bInterfaceProtocol = (pr) 1041 1042/** 1043 * USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces 1044 * @vend: the 16 bit USB Vendor ID 1045 * @prod: the 16 bit USB Product ID 1046 * @cl: bInterfaceClass value 1047 * @sc: bInterfaceSubClass value 1048 * @pr: bInterfaceProtocol value 1049 * 1050 * This macro is used to create a struct usb_device_id that matches a 1051 * specific device with a specific class of interfaces. 1052 * 1053 * This is especially useful when explicitly matching devices that have 1054 * vendor specific bDeviceClass values, but standards-compliant interfaces. 1055 */ 1056#define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \ 1057 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ 1058 | USB_DEVICE_ID_MATCH_DEVICE, \ 1059 .idVendor = (vend), \ 1060 .idProduct = (prod), \ 1061 .bInterfaceClass = (cl), \ 1062 .bInterfaceSubClass = (sc), \ 1063 .bInterfaceProtocol = (pr) 1064 1065/** 1066 * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces 1067 * @vend: the 16 bit USB Vendor ID 1068 * @cl: bInterfaceClass value 1069 * @sc: bInterfaceSubClass value 1070 * @pr: bInterfaceProtocol value 1071 * 1072 * This macro is used to create a struct usb_device_id that matches a 1073 * specific vendor with a specific class of interfaces. 1074 * 1075 * This is especially useful when explicitly matching devices that have 1076 * vendor specific bDeviceClass values, but standards-compliant interfaces. 1077 */ 1078#define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \ 1079 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ 1080 | USB_DEVICE_ID_MATCH_VENDOR, \ 1081 .idVendor = (vend), \ 1082 .bInterfaceClass = (cl), \ 1083 .bInterfaceSubClass = (sc), \ 1084 .bInterfaceProtocol = (pr) 1085 1086/* ----------------------------------------------------------------------- */ 1087 1088/* Stuff for dynamic usb ids */ 1089struct usb_dynids { 1090 spinlock_t lock; 1091 struct list_head list; 1092}; 1093 1094struct usb_dynid { 1095 struct list_head node; 1096 struct usb_device_id id; 1097}; 1098 1099extern ssize_t usb_store_new_id(struct usb_dynids *dynids, 1100 const struct usb_device_id *id_table, 1101 struct device_driver *driver, 1102 const char *buf, size_t count); 1103 1104extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); 1105 1106/** 1107 * struct usbdrv_wrap - wrapper for driver-model structure 1108 * @driver: The driver-model core driver structure. 1109 * @for_devices: Non-zero for device drivers, 0 for interface drivers. 1110 */ 1111struct usbdrv_wrap { 1112 struct device_driver driver; 1113 int for_devices; 1114}; 1115 1116/** 1117 * struct usb_driver - identifies USB interface driver to usbcore 1118 * @name: The driver name should be unique among USB drivers, 1119 * and should normally be the same as the module name. 1120 * @probe: Called to see if the driver is willing to manage a particular 1121 * interface on a device. If it is, probe returns zero and uses 1122 * usb_set_intfdata() to associate driver-specific data with the 1123 * interface. It may also use usb_set_interface() to specify the 1124 * appropriate altsetting. If unwilling to manage the interface, 1125 * return -ENODEV, if genuine IO errors occurred, an appropriate 1126 * negative errno value. 1127 * @disconnect: Called when the interface is no longer accessible, usually 1128 * because its device has been (or is being) disconnected or the 1129 * driver module is being unloaded. 1130 * @unlocked_ioctl: Used for drivers that want to talk to userspace through 1131 * the "usbfs" filesystem. This lets devices provide ways to 1132 * expose information to user space regardless of where they 1133 * do (or don't) show up otherwise in the filesystem. 1134 * @suspend: Called when the device is going to be suspended by the 1135 * system either from system sleep or runtime suspend context. The 1136 * return value will be ignored in system sleep context, so do NOT 1137 * try to continue using the device if suspend fails in this case. 1138 * Instead, let the resume or reset-resume routine recover from 1139 * the failure. 1140 * @resume: Called when the device is being resumed by the system. 1141 * @reset_resume: Called when the suspended device has been reset instead 1142 * of being resumed. 1143 * @pre_reset: Called by usb_reset_device() when the device is about to be 1144 * reset. This routine must not return until the driver has no active 1145 * URBs for the device, and no more URBs may be submitted until the 1146 * post_reset method is called. 1147 * @post_reset: Called by usb_reset_device() after the device 1148 * has been reset 1149 * @id_table: USB drivers use ID table to support hotplugging. 1150 * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set 1151 * or your driver's probe function will never get called. 1152 * @dynids: used internally to hold the list of dynamically added device 1153 * ids for this driver. 1154 * @drvwrap: Driver-model core structure wrapper. 1155 * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be 1156 * added to this driver by preventing the sysfs file from being created. 1157 * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend 1158 * for interfaces bound to this driver. 1159 * @soft_unbind: if set to 1, the USB core will not kill URBs and disable 1160 * endpoints before calling the driver's disconnect method. 1161 * @disable_hub_initiated_lpm: if set to 1, the USB core will not allow hubs 1162 * to initiate lower power link state transitions when an idle timeout 1163 * occurs. Device-initiated USB 3.0 link PM will still be allowed. 1164 * 1165 * USB interface drivers must provide a name, probe() and disconnect() 1166 * methods, and an id_table. Other driver fields are optional. 1167 * 1168 * The id_table is used in hotplugging. It holds a set of descriptors, 1169 * and specialized data may be associated with each entry. That table 1170 * is used by both user and kernel mode hotplugging support. 1171 * 1172 * The probe() and disconnect() methods are called in a context where 1173 * they can sleep, but they should avoid abusing the privilege. Most 1174 * work to connect to a device should be done when the device is opened, 1175 * and undone at the last close. The disconnect code needs to address 1176 * concurrency issues with respect to open() and close() methods, as 1177 * well as forcing all pending I/O requests to complete (by unlinking 1178 * them as necessary, and blocking until the unlinks complete). 1179 */ 1180struct usb_driver { 1181 const char *name; 1182 1183 int (*probe) (struct usb_interface *intf, 1184 const struct usb_device_id *id); 1185 1186 void (*disconnect) (struct usb_interface *intf); 1187 1188 int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code, 1189 void *buf); 1190 1191 int (*suspend) (struct usb_interface *intf, pm_message_t message); 1192 int (*resume) (struct usb_interface *intf); 1193 int (*reset_resume)(struct usb_interface *intf); 1194 1195 int (*pre_reset)(struct usb_interface *intf); 1196 int (*post_reset)(struct usb_interface *intf); 1197 1198 const struct usb_device_id *id_table; 1199 1200 struct usb_dynids dynids; 1201 struct usbdrv_wrap drvwrap; 1202 unsigned int no_dynamic_id:1; 1203 unsigned int supports_autosuspend:1; 1204 unsigned int disable_hub_initiated_lpm:1; 1205 unsigned int soft_unbind:1; 1206}; 1207#define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver) 1208 1209/** 1210 * struct usb_device_driver - identifies USB device driver to usbcore 1211 * @name: The driver name should be unique among USB drivers, 1212 * and should normally be the same as the module name. 1213 * @probe: Called to see if the driver is willing to manage a particular 1214 * device. If it is, probe returns zero and uses dev_set_drvdata() 1215 * to associate driver-specific data with the device. If unwilling 1216 * to manage the device, return a negative errno value. 1217 * @disconnect: Called when the device is no longer accessible, usually 1218 * because it has been (or is being) disconnected or the driver's 1219 * module is being unloaded. 1220 * @suspend: Called when the device is going to be suspended by the system. 1221 * @resume: Called when the device is being resumed by the system. 1222 * @drvwrap: Driver-model core structure wrapper. 1223 * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend 1224 * for devices bound to this driver. 1225 * 1226 * USB drivers must provide all the fields listed above except drvwrap. 1227 */ 1228struct usb_device_driver { 1229 const char *name; 1230 1231 int (*probe) (struct usb_device *udev); 1232 void (*disconnect) (struct usb_device *udev); 1233 1234 int (*suspend) (struct usb_device *udev, pm_message_t message); 1235 int (*resume) (struct usb_device *udev, pm_message_t message); 1236 struct usbdrv_wrap drvwrap; 1237 unsigned int supports_autosuspend:1; 1238}; 1239#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \ 1240 drvwrap.driver) 1241 1242extern struct bus_type usb_bus_type; 1243 1244/** 1245 * struct usb_class_driver - identifies a USB driver that wants to use the USB major number 1246 * @name: the usb class device name for this driver. Will show up in sysfs. 1247 * @devnode: Callback to provide a naming hint for a possible 1248 * device node to create. 1249 * @fops: pointer to the struct file_operations of this driver. 1250 * @minor_base: the start of the minor range for this driver. 1251 * 1252 * This structure is used for the usb_register_dev() and 1253 * usb_deregister_dev() functions, to consolidate a number of the 1254 * parameters used for them. 1255 */ 1256struct usb_class_driver { 1257 char *name; 1258 char *(*devnode)(struct device *dev, umode_t *mode); 1259 const struct file_operations *fops; 1260 int minor_base; 1261}; 1262 1263/* 1264 * use these in module_init()/module_exit() 1265 * and don't forget MODULE_DEVICE_TABLE(usb, ...) 1266 */ 1267extern int usb_register_driver(struct usb_driver *, struct module *, 1268 const char *); 1269 1270/* use a define to avoid include chaining to get THIS_MODULE & friends */ 1271#define usb_register(driver) \ 1272 usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) 1273 1274extern void usb_deregister(struct usb_driver *); 1275 1276/** 1277 * module_usb_driver() - Helper macro for registering a USB driver 1278 * @__usb_driver: usb_driver struct 1279 * 1280 * Helper macro for USB drivers which do not do anything special in module 1281 * init/exit. This eliminates a lot of boilerplate. Each module may only 1282 * use this macro once, and calling it replaces module_init() and module_exit() 1283 */ 1284#define module_usb_driver(__usb_driver) \ 1285 module_driver(__usb_driver, usb_register, \ 1286 usb_deregister) 1287 1288extern int usb_register_device_driver(struct usb_device_driver *, 1289 struct module *); 1290extern void usb_deregister_device_driver(struct usb_device_driver *); 1291 1292extern int usb_register_dev(struct usb_interface *intf, 1293 struct usb_class_driver *class_driver); 1294extern void usb_deregister_dev(struct usb_interface *intf, 1295 struct usb_class_driver *class_driver); 1296 1297extern int usb_disabled(void); 1298 1299/* ----------------------------------------------------------------------- */ 1300 1301/* 1302 * URB support, for asynchronous request completions 1303 */ 1304 1305/* 1306 * urb->transfer_flags: 1307 * 1308 * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb(). 1309 */ 1310#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */ 1311#define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired 1312 * slot in the schedule */ 1313#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ 1314#define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ 1315#define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt 1316 * needed */ 1317#define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */ 1318 1319/* The following flags are used internally by usbcore and HCDs */ 1320#define URB_DIR_IN 0x0200 /* Transfer from device to host */ 1321#define URB_DIR_OUT 0 1322#define URB_DIR_MASK URB_DIR_IN 1323 1324#define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */ 1325#define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */ 1326#define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */ 1327#define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */ 1328#define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */ 1329#define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */ 1330#define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */ 1331#define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */ 1332 1333struct usb_iso_packet_descriptor { 1334 unsigned int offset; 1335 unsigned int length; /* expected length */ 1336 unsigned int actual_length; 1337 int status; 1338}; 1339 1340struct urb; 1341 1342struct usb_anchor { 1343 struct list_head urb_list; 1344 wait_queue_head_t wait; 1345 spinlock_t lock; 1346 atomic_t suspend_wakeups; 1347 unsigned int poisoned:1; 1348}; 1349 1350static inline void init_usb_anchor(struct usb_anchor *anchor) 1351{ 1352 memset(anchor, 0, sizeof(*anchor)); 1353 INIT_LIST_HEAD(&anchor->urb_list); 1354 init_waitqueue_head(&anchor->wait); 1355 spin_lock_init(&anchor->lock); 1356} 1357 1358typedef void (*usb_complete_t)(struct urb *); 1359 1360/** 1361 * struct urb - USB Request Block 1362 * @urb_list: For use by current owner of the URB. 1363 * @anchor_list: membership in the list of an anchor 1364 * @anchor: to anchor URBs to a common mooring 1365 * @ep: Points to the endpoint's data structure. Will eventually 1366 * replace @pipe. 1367 * @pipe: Holds endpoint number, direction, type, and more. 1368 * Create these values with the eight macros available; 1369 * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl" 1370 * (control), "bulk", "int" (interrupt), or "iso" (isochronous). 1371 * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint 1372 * numbers range from zero to fifteen. Note that "in" endpoint two 1373 * is a different endpoint (and pipe) from "out" endpoint two. 1374 * The current configuration controls the existence, type, and 1375 * maximum packet size of any given endpoint. 1376 * @stream_id: the endpoint's stream ID for bulk streams 1377 * @dev: Identifies the USB device to perform the request. 1378 * @status: This is read in non-iso completion functions to get the 1379 * status of the particular request. ISO requests only use it 1380 * to tell whether the URB was unlinked; detailed status for 1381 * each frame is in the fields of the iso_frame-desc. 1382 * @transfer_flags: A variety of flags may be used to affect how URB 1383 * submission, unlinking, or operation are handled. Different 1384 * kinds of URB can use different flags. 1385 * @transfer_buffer: This identifies the buffer to (or from) which the I/O 1386 * request will be performed unless URB_NO_TRANSFER_DMA_MAP is set 1387 * (however, do not leave garbage in transfer_buffer even then). 1388 * This buffer must be suitable for DMA; allocate it with 1389 * kmalloc() or equivalent. For transfers to "in" endpoints, contents 1390 * of this buffer will be modified. This buffer is used for the data 1391 * stage of control transfers. 1392 * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP, 1393 * the device driver is saying that it provided this DMA address, 1394 * which the host controller driver should use in preference to the 1395 * transfer_buffer. 1396 * @sg: scatter gather buffer list, the buffer size of each element in 1397 * the list (except the last) must be divisible by the endpoint's 1398 * max packet size if no_sg_constraint isn't set in 'struct usb_bus' 1399 * @num_mapped_sgs: (internal) number of mapped sg entries 1400 * @num_sgs: number of entries in the sg list 1401 * @transfer_buffer_length: How big is transfer_buffer. The transfer may 1402 * be broken up into chunks according to the current maximum packet 1403 * size for the endpoint, which is a function of the configuration 1404 * and is encoded in the pipe. When the length is zero, neither 1405 * transfer_buffer nor transfer_dma is used. 1406 * @actual_length: This is read in non-iso completion functions, and 1407 * it tells how many bytes (out of transfer_buffer_length) were 1408 * transferred. It will normally be the same as requested, unless 1409 * either an error was reported or a short read was performed. 1410 * The URB_SHORT_NOT_OK transfer flag may be used to make such 1411 * short reads be reported as errors. 1412 * @setup_packet: Only used for control transfers, this points to eight bytes 1413 * of setup data. Control transfers always start by sending this data 1414 * to the device. Then transfer_buffer is read or written, if needed. 1415 * @setup_dma: DMA pointer for the setup packet. The caller must not use 1416 * this field; setup_packet must point to a valid buffer. 1417 * @start_frame: Returns the initial frame for isochronous transfers. 1418 * @number_of_packets: Lists the number of ISO transfer buffers. 1419 * @interval: Specifies the polling interval for interrupt or isochronous 1420 * transfers. The units are frames (milliseconds) for full and low 1421 * speed devices, and microframes (1/8 millisecond) for highspeed 1422 * and SuperSpeed devices. 1423 * @error_count: Returns the number of ISO transfers that reported errors. 1424 * @context: For use in completion functions. This normally points to 1425 * request-specific driver context. 1426 * @complete: Completion handler. This URB is passed as the parameter to the 1427 * completion function. The completion function may then do what 1428 * it likes with the URB, including resubmitting or freeing it. 1429 * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to 1430 * collect the transfer status for each buffer. 1431 * 1432 * This structure identifies USB transfer requests. URBs must be allocated by 1433 * calling usb_alloc_urb() and freed with a call to usb_free_urb(). 1434 * Initialization may be done using various usb_fill_*_urb() functions. URBs 1435 * are submitted using usb_submit_urb(), and pending requests may be canceled 1436 * using usb_unlink_urb() or usb_kill_urb(). 1437 * 1438 * Data Transfer Buffers: 1439 * 1440 * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise 1441 * taken from the general page pool. That is provided by transfer_buffer 1442 * (control requests also use setup_packet), and host controller drivers 1443 * perform a dma mapping (and unmapping) for each buffer transferred. Those 1444 * mapping operations can be expensive on some platforms (perhaps using a dma 1445 * bounce buffer or talking to an IOMMU), 1446 * although they're cheap on commodity x86 and ppc hardware. 1447 * 1448 * Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag, 1449 * which tells the host controller driver that no such mapping is needed for 1450 * the transfer_buffer since 1451 * the device driver is DMA-aware. For example, a device driver might 1452 * allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map(). 1453 * When this transfer flag is provided, host controller drivers will 1454 * attempt to use the dma address found in the transfer_dma 1455 * field rather than determining a dma address themselves. 1456 * 1457 * Note that transfer_buffer must still be set if the controller 1458 * does not support DMA (as indicated by bus.uses_dma) and when talking 1459 * to root hub. If you have to trasfer between highmem zone and the device 1460 * on such controller, create a bounce buffer or bail out with an error. 1461 * If transfer_buffer cannot be set (is in highmem) and the controller is DMA 1462 * capable, assign NULL to it, so that usbmon knows not to use the value. 1463 * The setup_packet must always be set, so it cannot be located in highmem. 1464 * 1465 * Initialization: 1466 * 1467 * All URBs submitted must initialize the dev, pipe, transfer_flags (may be 1468 * zero), and complete fields. All URBs must also initialize 1469 * transfer_buffer and transfer_buffer_length. They may provide the 1470 * URB_SHORT_NOT_OK transfer flag, indicating that short reads are 1471 * to be treated as errors; that flag is invalid for write requests. 1472 * 1473 * Bulk URBs may 1474 * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers 1475 * should always terminate with a short packet, even if it means adding an 1476 * extra zero length packet. 1477 * 1478 * Control URBs must provide a valid pointer in the setup_packet field. 1479 * Unlike the transfer_buffer, the setup_packet may not be mapped for DMA 1480 * beforehand. 1481 * 1482 * Interrupt URBs must provide an interval, saying how often (in milliseconds 1483 * or, for highspeed devices, 125 microsecond units) 1484 * to poll for transfers. After the URB has been submitted, the interval 1485 * field reflects how the transfer was actually scheduled. 1486 * The polling interval may be more frequent than requested. 1487 * For example, some controllers have a maximum interval of 32 milliseconds, 1488 * while others support intervals of up to 1024 milliseconds. 1489 * Isochronous URBs also have transfer intervals. (Note that for isochronous 1490 * endpoints, as well as high speed interrupt endpoints, the encoding of 1491 * the transfer interval in the endpoint descriptor is logarithmic. 1492 * Device drivers must convert that value to linear units themselves.) 1493 * 1494 * If an isochronous endpoint queue isn't already running, the host 1495 * controller will schedule a new URB to start as soon as bandwidth 1496 * utilization allows. If the queue is running then a new URB will be 1497 * scheduled to start in the first transfer slot following the end of the 1498 * preceding URB, if that slot has not already expired. If the slot has 1499 * expired (which can happen when IRQ delivery is delayed for a long time), 1500 * the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag 1501 * is clear then the URB will be scheduled to start in the expired slot, 1502 * implying that some of its packets will not be transferred; if the flag 1503 * is set then the URB will be scheduled in the first unexpired slot, 1504 * breaking the queue's synchronization. Upon URB completion, the 1505 * start_frame field will be set to the (micro)frame number in which the 1506 * transfer was scheduled. Ranges for frame counter values are HC-specific 1507 * and can go from as low as 256 to as high as 65536 frames. 1508 * 1509 * Isochronous URBs have a different data transfer model, in part because 1510 * the quality of service is only "best effort". Callers provide specially 1511 * allocated URBs, with number_of_packets worth of iso_frame_desc structures 1512 * at the end. Each such packet is an individual ISO transfer. Isochronous 1513 * URBs are normally queued, submitted by drivers to arrange that 1514 * transfers are at least double buffered, and then explicitly resubmitted 1515 * in completion handlers, so 1516 * that data (such as audio or video) streams at as constant a rate as the 1517 * host controller scheduler can support. 1518 * 1519 * Completion Callbacks: 1520 * 1521 * The completion callback is made in_interrupt(), and one of the first 1522 * things that a completion handler should do is check the status field. 1523 * The status field is provided for all URBs. It is used to report 1524 * unlinked URBs, and status for all non-ISO transfers. It should not 1525 * be examined before the URB is returned to the completion handler. 1526 * 1527 * The context field is normally used to link URBs back to the relevant 1528 * driver or request state. 1529 * 1530 * When the completion callback is invoked for non-isochronous URBs, the 1531 * actual_length field tells how many bytes were transferred. This field 1532 * is updated even when the URB terminated with an error or was unlinked. 1533 * 1534 * ISO transfer status is reported in the status and actual_length fields 1535 * of the iso_frame_desc array, and the number of errors is reported in 1536 * error_count. Completion callbacks for ISO transfers will normally 1537 * (re)submit URBs to ensure a constant transfer rate. 1538 * 1539 * Note that even fields marked "public" should not be touched by the driver 1540 * when the urb is owned by the hcd, that is, since the call to 1541 * usb_submit_urb() till the entry into the completion routine. 1542 */ 1543struct urb { 1544 /* private: usb core and host controller only fields in the urb */ 1545 struct kref kref; /* reference count of the URB */ 1546 int unlinked; /* unlink error code */ 1547 void *hcpriv; /* private data for host controller */ 1548 atomic_t use_count; /* concurrent submissions counter */ 1549 atomic_t reject; /* submissions will fail */ 1550 1551 /* public: documented fields in the urb that can be used by drivers */ 1552 struct list_head urb_list; /* list head for use by the urb's 1553 * current owner */ 1554 struct list_head anchor_list; /* the URB may be anchored */ 1555 struct usb_anchor *anchor; 1556 struct usb_device *dev; /* (in) pointer to associated device */ 1557 struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */ 1558 unsigned int pipe; /* (in) pipe information */ 1559 unsigned int stream_id; /* (in) stream ID */ 1560 int status; /* (return) non-ISO status */ 1561 unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/ 1562 void *transfer_buffer; /* (in) associated data buffer */ 1563 dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */ 1564 struct scatterlist *sg; /* (in) scatter gather buffer list */ 1565 int num_mapped_sgs; /* (internal) mapped sg entries */ 1566 int num_sgs; /* (in) number of entries in the sg list */ 1567 u32 transfer_buffer_length; /* (in) data buffer length */ 1568 u32 actual_length; /* (return) actual transfer length */ 1569 unsigned char *setup_packet; /* (in) setup packet (control only) */ 1570 dma_addr_t setup_dma; /* (in) dma addr for setup_packet */ 1571 int start_frame; /* (modify) start frame (ISO) */ 1572 int number_of_packets; /* (in) number of ISO packets */ 1573 int interval; /* (modify) transfer interval 1574 * (INT/ISO) */ 1575 int error_count; /* (return) number of ISO errors */ 1576 void *context; /* (in) context for completion */ 1577 usb_complete_t complete; /* (in) completion routine */ 1578 struct usb_iso_packet_descriptor iso_frame_desc[0]; 1579 /* (in) ISO ONLY */ 1580}; 1581 1582/* ----------------------------------------------------------------------- */ 1583 1584/** 1585 * usb_fill_control_urb - initializes a control urb 1586 * @urb: pointer to the urb to initialize. 1587 * @dev: pointer to the struct usb_device for this urb. 1588 * @pipe: the endpoint pipe 1589 * @setup_packet: pointer to the setup_packet buffer 1590 * @transfer_buffer: pointer to the transfer buffer 1591 * @buffer_length: length of the transfer buffer 1592 * @complete_fn: pointer to the usb_complete_t function 1593 * @context: what to set the urb context to. 1594 * 1595 * Initializes a control urb with the proper information needed to submit 1596 * it to a device. 1597 */ 1598static inline void usb_fill_control_urb(struct urb *urb, 1599 struct usb_device *dev, 1600 unsigned int pipe, 1601 unsigned char *setup_packet, 1602 void *transfer_buffer, 1603 int buffer_length, 1604 usb_complete_t complete_fn, 1605 void *context) 1606{ 1607 urb->dev = dev; 1608 urb->pipe = pipe; 1609 urb->setup_packet = setup_packet; 1610 urb->transfer_buffer = transfer_buffer; 1611 urb->transfer_buffer_length = buffer_length; 1612 urb->complete = complete_fn; 1613 urb->context = context; 1614} 1615 1616/** 1617 * usb_fill_bulk_urb - macro to help initialize a bulk urb 1618 * @urb: pointer to the urb to initialize. 1619 * @dev: pointer to the struct usb_device for this urb. 1620 * @pipe: the endpoint pipe 1621 * @transfer_buffer: pointer to the transfer buffer 1622 * @buffer_length: length of the transfer buffer 1623 * @complete_fn: pointer to the usb_complete_t function 1624 * @context: what to set the urb context to. 1625 * 1626 * Initializes a bulk urb with the proper information needed to submit it 1627 * to a device. 1628 */ 1629static inline void usb_fill_bulk_urb(struct urb *urb, 1630 struct usb_device *dev, 1631 unsigned int pipe, 1632 void *transfer_buffer, 1633 int buffer_length, 1634 usb_complete_t complete_fn, 1635 void *context) 1636{ 1637 urb->dev = dev; 1638 urb->pipe = pipe; 1639 urb->transfer_buffer = transfer_buffer; 1640 urb->transfer_buffer_length = buffer_length; 1641 urb->complete = complete_fn; 1642 urb->context = context; 1643} 1644 1645/** 1646 * usb_fill_int_urb - macro to help initialize a interrupt urb 1647 * @urb: pointer to the urb to initialize. 1648 * @dev: pointer to the struct usb_device for this urb. 1649 * @pipe: the endpoint pipe 1650 * @transfer_buffer: pointer to the transfer buffer 1651 * @buffer_length: length of the transfer buffer 1652 * @complete_fn: pointer to the usb_complete_t function 1653 * @context: what to set the urb context to. 1654 * @interval: what to set the urb interval to, encoded like 1655 * the endpoint descriptor's bInterval value. 1656 * 1657 * Initializes a interrupt urb with the proper information needed to submit 1658 * it to a device. 1659 * 1660 * Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic 1661 * encoding of the endpoint interval, and express polling intervals in 1662 * microframes (eight per millisecond) rather than in frames (one per 1663 * millisecond). 1664 * 1665 * Wireless USB also uses the logarithmic encoding, but specifies it in units of 1666 * 128us instead of 125us. For Wireless USB devices, the interval is passed 1667 * through to the host controller, rather than being translated into microframe 1668 * units. 1669 */ 1670static inline void usb_fill_int_urb(struct urb *urb, 1671 struct usb_device *dev, 1672 unsigned int pipe, 1673 void *transfer_buffer, 1674 int buffer_length, 1675 usb_complete_t complete_fn, 1676 void *context, 1677 int interval) 1678{ 1679 urb->dev = dev; 1680 urb->pipe = pipe; 1681 urb->transfer_buffer = transfer_buffer; 1682 urb->transfer_buffer_length = buffer_length; 1683 urb->complete = complete_fn; 1684 urb->context = context; 1685 1686 if (dev->speed == USB_SPEED_HIGH || dev->speed >= USB_SPEED_SUPER) { 1687 /* make sure interval is within allowed range */ 1688 interval = clamp(interval, 1, 16); 1689 1690 urb->interval = 1 << (interval - 1); 1691 } else { 1692 urb->interval = interval; 1693 } 1694 1695 urb->start_frame = -1; 1696} 1697 1698extern void usb_init_urb(struct urb *urb); 1699extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags); 1700extern void usb_free_urb(struct urb *urb); 1701#define usb_put_urb usb_free_urb 1702extern struct urb *usb_get_urb(struct urb *urb); 1703extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags); 1704extern int usb_unlink_urb(struct urb *urb); 1705extern void usb_kill_urb(struct urb *urb); 1706extern void usb_poison_urb(struct urb *urb); 1707extern void usb_unpoison_urb(struct urb *urb); 1708extern void usb_block_urb(struct urb *urb); 1709extern void usb_kill_anchored_urbs(struct usb_anchor *anchor); 1710extern void usb_poison_anchored_urbs(struct usb_anchor *anchor); 1711extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor); 1712extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor); 1713extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor); 1714extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor); 1715extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor); 1716extern void usb_unanchor_urb(struct urb *urb); 1717extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, 1718 unsigned int timeout); 1719extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor); 1720extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor); 1721extern int usb_anchor_empty(struct usb_anchor *anchor); 1722 1723#define usb_unblock_urb usb_unpoison_urb 1724 1725/** 1726 * usb_urb_dir_in - check if an URB describes an IN transfer 1727 * @urb: URB to be checked 1728 * 1729 * Return: 1 if @urb describes an IN transfer (device-to-host), 1730 * otherwise 0. 1731 */ 1732static inline int usb_urb_dir_in(struct urb *urb) 1733{ 1734 return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN; 1735} 1736 1737/** 1738 * usb_urb_dir_out - check if an URB describes an OUT transfer 1739 * @urb: URB to be checked 1740 * 1741 * Return: 1 if @urb describes an OUT transfer (host-to-device), 1742 * otherwise 0. 1743 */ 1744static inline int usb_urb_dir_out(struct urb *urb) 1745{ 1746 return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT; 1747} 1748 1749int usb_urb_ep_type_check(const struct urb *urb); 1750 1751void *usb_alloc_coherent(struct usb_device *dev, size_t size, 1752 gfp_t mem_flags, dma_addr_t *dma); 1753void usb_free_coherent(struct usb_device *dev, size_t size, 1754 void *addr, dma_addr_t dma); 1755 1756#if 0 1757struct urb *usb_buffer_map(struct urb *urb); 1758void usb_buffer_dmasync(struct urb *urb); 1759void usb_buffer_unmap(struct urb *urb); 1760#endif 1761 1762struct scatterlist; 1763int usb_buffer_map_sg(const struct usb_device *dev, int is_in, 1764 struct scatterlist *sg, int nents); 1765#if 0 1766void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, 1767 struct scatterlist *sg, int n_hw_ents); 1768#endif 1769void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, 1770 struct scatterlist *sg, int n_hw_ents); 1771 1772/*-------------------------------------------------------------------* 1773 * SYNCHRONOUS CALL SUPPORT * 1774 *-------------------------------------------------------------------*/ 1775 1776extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, 1777 __u8 request, __u8 requesttype, __u16 value, __u16 index, 1778 void *data, __u16 size, int timeout); 1779extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, 1780 void *data, int len, int *actual_length, int timeout); 1781extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, 1782 void *data, int len, int *actual_length, 1783 int timeout); 1784 1785/* wrappers around usb_control_msg() for the most common standard requests */ 1786extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype, 1787 unsigned char descindex, void *buf, int size); 1788extern int usb_get_status(struct usb_device *dev, 1789 int recip, int type, int target, void *data); 1790 1791static inline int usb_get_std_status(struct usb_device *dev, 1792 int recip, int target, void *data) 1793{ 1794 return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target, 1795 data); 1796} 1797 1798static inline int usb_get_ptm_status(struct usb_device *dev, void *data) 1799{ 1800 return usb_get_status(dev, USB_RECIP_DEVICE, USB_STATUS_TYPE_PTM, 1801 0, data); 1802} 1803 1804extern int usb_string(struct usb_device *dev, int index, 1805 char *buf, size_t size); 1806 1807/* wrappers that also update important state inside usbcore */ 1808extern int usb_clear_halt(struct usb_device *dev, int pipe); 1809extern int usb_reset_configuration(struct usb_device *dev); 1810extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); 1811extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); 1812 1813/* this request isn't really synchronous, but it belongs with the others */ 1814extern int usb_driver_set_configuration(struct usb_device *udev, int config); 1815 1816/* choose and set configuration for device */ 1817extern int usb_choose_configuration(struct usb_device *udev); 1818extern int usb_set_configuration(struct usb_device *dev, int configuration); 1819 1820/* 1821 * timeouts, in milliseconds, used for sending/receiving control messages 1822 * they typically complete within a few frames (msec) after they're issued 1823 * USB identifies 5 second timeouts, maybe more in a few cases, and a few 1824 * slow devices (like some MGE Ellipse UPSes) actually push that limit. 1825 */ 1826#define USB_CTRL_GET_TIMEOUT 5000 1827#define USB_CTRL_SET_TIMEOUT 5000 1828 1829 1830/** 1831 * struct usb_sg_request - support for scatter/gather I/O 1832 * @status: zero indicates success, else negative errno 1833 * @bytes: counts bytes transferred. 1834 * 1835 * These requests are initialized using usb_sg_init(), and then are used 1836 * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most 1837 * members of the request object aren't for driver access. 1838 * 1839 * The status and bytecount values are valid only after usb_sg_wait() 1840 * returns. If the status is zero, then the bytecount matches the total 1841 * from the request. 1842 * 1843 * After an error completion, drivers may need to clear a halt condition 1844 * on the endpoint. 1845 */ 1846struct usb_sg_request { 1847 int status; 1848 size_t bytes; 1849 1850 /* private: 1851 * members below are private to usbcore, 1852 * and are not provided for driver access! 1853 */ 1854 spinlock_t lock; 1855 1856 struct usb_device *dev; 1857 int pipe; 1858 1859 int entries; 1860 struct urb **urbs; 1861 1862 int count; 1863 struct completion complete; 1864}; 1865 1866int usb_sg_init( 1867 struct usb_sg_request *io, 1868 struct usb_device *dev, 1869 unsigned pipe, 1870 unsigned period, 1871 struct scatterlist *sg, 1872 int nents, 1873 size_t length, 1874 gfp_t mem_flags 1875); 1876void usb_sg_cancel(struct usb_sg_request *io); 1877void usb_sg_wait(struct usb_sg_request *io); 1878 1879 1880/* ----------------------------------------------------------------------- */ 1881 1882/* 1883 * For various legacy reasons, Linux has a small cookie that's paired with 1884 * a struct usb_device to identify an endpoint queue. Queue characteristics 1885 * are defined by the endpoint's descriptor. This cookie is called a "pipe", 1886 * an unsigned int encoded as: 1887 * 1888 * - direction: bit 7 (0 = Host-to-Device [Out], 1889 * 1 = Device-to-Host [In] ... 1890 * like endpoint bEndpointAddress) 1891 * - device address: bits 8-14 ... bit positions known to uhci-hcd 1892 * - endpoint: bits 15-18 ... bit positions known to uhci-hcd 1893 * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt, 1894 * 10 = control, 11 = bulk) 1895 * 1896 * Given the device address and endpoint descriptor, pipes are redundant. 1897 */ 1898 1899/* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */ 1900/* (yet ... they're the values used by usbfs) */ 1901#define PIPE_ISOCHRONOUS 0 1902#define PIPE_INTERRUPT 1 1903#define PIPE_CONTROL 2 1904#define PIPE_BULK 3 1905 1906#define usb_pipein(pipe) ((pipe) & USB_DIR_IN) 1907#define usb_pipeout(pipe) (!usb_pipein(pipe)) 1908 1909#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f) 1910#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf) 1911 1912#define usb_pipetype(pipe) (((pipe) >> 30) & 3) 1913#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS) 1914#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT) 1915#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL) 1916#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK) 1917 1918static inline unsigned int __create_pipe(struct usb_device *dev, 1919 unsigned int endpoint) 1920{ 1921 return (dev->devnum << 8) | (endpoint << 15); 1922} 1923 1924/* Create various pipes... */ 1925#define usb_sndctrlpipe(dev, endpoint) \ 1926 ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint)) 1927#define usb_rcvctrlpipe(dev, endpoint) \ 1928 ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) 1929#define usb_sndisocpipe(dev, endpoint) \ 1930 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint)) 1931#define usb_rcvisocpipe(dev, endpoint) \ 1932 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) 1933#define usb_sndbulkpipe(dev, endpoint) \ 1934 ((PIPE_BULK << 30) | __create_pipe(dev, endpoint)) 1935#define usb_rcvbulkpipe(dev, endpoint) \ 1936 ((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) 1937#define usb_sndintpipe(dev, endpoint) \ 1938 ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint)) 1939#define usb_rcvintpipe(dev, endpoint) \ 1940 ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) 1941 1942static inline struct usb_host_endpoint * 1943usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe) 1944{ 1945 struct usb_host_endpoint **eps; 1946 eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out; 1947 return eps[usb_pipeendpoint(pipe)]; 1948} 1949 1950/*-------------------------------------------------------------------------*/ 1951 1952static inline __u16 1953usb_maxpacket(struct usb_device *udev, int pipe, int is_out) 1954{ 1955 struct usb_host_endpoint *ep; 1956 unsigned epnum = usb_pipeendpoint(pipe); 1957 1958 if (is_out) { 1959 WARN_ON(usb_pipein(pipe)); 1960 ep = udev->ep_out[epnum]; 1961 } else { 1962 WARN_ON(usb_pipeout(pipe)); 1963 ep = udev->ep_in[epnum]; 1964 } 1965 if (!ep) 1966 return 0; 1967 1968 /* NOTE: only 0x07ff bits are for packet size... */ 1969 return usb_endpoint_maxp(&ep->desc); 1970} 1971 1972/* ----------------------------------------------------------------------- */ 1973 1974/* translate USB error codes to codes user space understands */ 1975static inline int usb_translate_errors(int error_code) 1976{ 1977 switch (error_code) { 1978 case 0: 1979 case -ENOMEM: 1980 case -ENODEV: 1981 case -EOPNOTSUPP: 1982 return error_code; 1983 default: 1984 return -EIO; 1985 } 1986} 1987 1988/* Events from the usb core */ 1989#define USB_DEVICE_ADD 0x0001 1990#define USB_DEVICE_REMOVE 0x0002 1991#define USB_BUS_ADD 0x0003 1992#define USB_BUS_REMOVE 0x0004 1993extern void usb_register_notify(struct notifier_block *nb); 1994extern void usb_unregister_notify(struct notifier_block *nb); 1995 1996/* debugfs stuff */ 1997extern struct dentry *usb_debug_root; 1998 1999/* LED triggers */ 2000enum usb_led_event {
2001 USB_LED_EVENT_HOST = 0, 2002 USB_LED_EVENT_GADGET = 1, 2003}; 2004 2005#ifdef CONFIG_USB_LED_TRIG 2006extern void usb_led_activity(enum usb_led_event ev); 2007#else 2008static inline void usb_led_activity(enum usb_led_event ev) {} 2009#endif 2010 2011#endif /* __KERNEL__ */ 2012 2013#endif 2014