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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_USB_H |
3 | #define __LINUX_USB_H | |
4 | ||
5 | #include <linux/mod_devicetable.h> | |
5f848137 | 6 | #include <linux/usb/ch9.h> |
1da177e4 LT |
7 | |
8 | #define USB_MAJOR 180 | |
fbf82fd2 | 9 | #define USB_DEVICE_MAJOR 189 |
1da177e4 LT |
10 | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
1da177e4 LT |
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 */ | |
645daaab | 23 | #include <linux/mutex.h> /* for struct mutex */ |
6ddf27cd | 24 | #include <linux/pm_runtime.h> /* for runtime PM */ |
1da177e4 LT |
25 | |
26 | struct usb_device; | |
27 | struct usb_driver; | |
b1d8dfb0 | 28 | struct wusb_dev; |
1da177e4 LT |
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. | |
663c30d0 | 41 | * - a SuperSpeed endpoint has a companion descriptor |
1da177e4 LT |
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 | ||
9bde7497 GKH |
48 | struct ep_device; |
49 | ||
1da177e4 LT |
50 | /** |
51 | * struct usb_host_endpoint - host-side endpoint descriptor and queue | |
52 | * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder | |
842f1690 | 53 | * @ss_ep_comp: SuperSpeed companion descriptor for this endpoint |
b37d83a6 | 54 | * @ssp_isoc_ep_comp: SuperSpeedPlus isoc companion descriptor for this endpoint |
1da177e4 LT |
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 | |
7fac9a33 | 58 | * @ep_dev: ep_device for sysfs info |
1da177e4 LT |
59 | * @extra: descriptors following this endpoint in the configuration |
60 | * @extralen: how many bytes of "extra" are valid | |
bdd016ba | 61 | * @enabled: URBs may be submitted to this endpoint |
8d4f70b2 | 62 | * @streams: number of USB-3 streams allocated on the endpoint |
1da177e4 LT |
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 | */ | |
67 | struct usb_host_endpoint { | |
842f1690 AS |
68 | struct usb_endpoint_descriptor desc; |
69 | struct usb_ss_ep_comp_descriptor ss_ep_comp; | |
b37d83a6 | 70 | struct usb_ssp_isoc_ep_comp_descriptor ssp_isoc_ep_comp; |
1da177e4 LT |
71 | struct list_head urb_list; |
72 | void *hcpriv; | |
812219ab | 73 | struct ep_device *ep_dev; /* For sysfs info */ |
1da177e4 LT |
74 | |
75 | unsigned char *extra; /* Extra descriptors */ | |
76 | int extralen; | |
bdd016ba | 77 | int enabled; |
8d4f70b2 | 78 | int streams; |
1da177e4 LT |
79 | }; |
80 | ||
81 | /* host-side wrapper for one interface setting's parsed descriptors */ | |
82 | struct usb_host_interface { | |
83 | struct usb_interface_descriptor desc; | |
84 | ||
0d5ff306 RK |
85 | int extralen; |
86 | unsigned char *extra; /* Extra descriptors */ | |
87 | ||
9636c378 | 88 | /* array of desc.bNumEndpoints endpoints associated with this |
1da177e4 LT |
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 */ | |
1da177e4 LT |
94 | }; |
95 | ||
96 | enum usb_interface_condition { | |
97 | USB_INTERFACE_UNBOUND = 0, | |
98 | USB_INTERFACE_BINDING, | |
99 | USB_INTERFACE_BOUND, | |
100 | USB_INTERFACE_UNBINDING, | |
101 | }; | |
102 | ||
66a35939 JH |
103 | int __must_check |
104 | usb_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 | ||
279daf4e JH |
110 | int __must_check |
111 | usb_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 | ||
66a35939 JH |
117 | static inline int __must_check |
118 | usb_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 | ||
124 | static inline int __must_check | |
125 | usb_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 | ||
131 | static inline int __must_check | |
132 | usb_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 | ||
138 | static inline int __must_check | |
139 | usb_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 | ||
279daf4e JH |
145 | static inline int __must_check |
146 | usb_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 | ||
152 | static inline int __must_check | |
153 | usb_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 | ||
159 | static inline int __must_check | |
160 | usb_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 | ||
166 | static inline int __must_check | |
167 | usb_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 | ||
1da177e4 LT |
173 | /** |
174 | * struct usb_interface - what usb device drivers talk to | |
175 | * @altsetting: array of interface structures, one for each alternate | |
812219ab GKH |
176 | * setting that may be selected. Each one includes a set of |
177 | * endpoint configurations. They will be in no particular order. | |
1da177e4 | 178 | * @cur_altsetting: the current altsetting. |
d6d914f5 | 179 | * @num_altsetting: number of altsettings defined. |
3f423787 | 180 | * @intf_assoc: interface association descriptor |
1da177e4 LT |
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()) | |
f88ed90d | 189 | * @sysfs_files_created: sysfs attributes exist |
3b23dd6f | 190 | * @ep_devs_created: endpoint child pseudo-devices exist |
352d0263 | 191 | * @unregistering: flag set when the interface is being unregistered |
645daaab AS |
192 | * @needs_remote_wakeup: flag set when the driver requires remote-wakeup |
193 | * capability during autosuspend. | |
55151d7d AS |
194 | * @needs_altsetting0: flag set when a set-interface request for altsetting 0 |
195 | * has been deferred. | |
f4f4d587 AS |
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. | |
07294cc2 SK |
198 | * @authorized: This allows to (de)authorize individual interfaces instead |
199 | * a whole device in contrast to the device authorization. | |
1da177e4 | 200 | * @dev: driver model's view of this device |
0873c764 GKH |
201 | * @usb_dev: if an interface is bound to the USB major, this will point |
202 | * to the sysfs representation for that device. | |
dc023dce | 203 | * @reset_ws: Used for scheduling resets from atomic context. |
c6ba1c2a RD |
204 | * @resetting_device: USB core reset the device, so use alt setting 0 as |
205 | * current; needs bandwidth alloc after reset. | |
1da177e4 LT |
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 | |
59c51591 | 221 | * used to control the use of periodic endpoints, such as by having |
1da177e4 LT |
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 | */ | |
232 | struct 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 | ||
165fe97e CN |
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 | ||
b724ae77 AS |
245 | int minor; /* minor number this interface is |
246 | * bound to */ | |
1da177e4 | 247 | enum usb_interface_condition condition; /* state of binding */ |
7e61559f | 248 | unsigned sysfs_files_created:1; /* the sysfs attributes exist */ |
3b23dd6f | 249 | unsigned ep_devs_created:1; /* endpoint "devices" exist */ |
352d0263 | 250 | unsigned unregistering:1; /* unregistration is in progress */ |
645daaab | 251 | unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */ |
55151d7d | 252 | unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */ |
78d9a487 | 253 | unsigned needs_binding:1; /* needs delayed unbind/rebind */ |
04a723ea | 254 | unsigned resetting_device:1; /* true: bandwidth alloc after reset */ |
4ad2ddce | 255 | unsigned authorized:1; /* used for interface authorization */ |
4d064c08 | 256 | |
1da177e4 | 257 | struct device dev; /* interface specific device info */ |
969ab2ee | 258 | struct device *usb_dev; |
dc023dce | 259 | struct work_struct reset_ws; /* for resets in atomic context */ |
1da177e4 LT |
260 | }; |
261 | #define to_usb_interface(d) container_of(d, struct usb_interface, dev) | |
1da177e4 | 262 | |
969ab2ee | 263 | static inline void *usb_get_intfdata(struct usb_interface *intf) |
1da177e4 | 264 | { |
969ab2ee | 265 | return dev_get_drvdata(&intf->dev); |
1da177e4 LT |
266 | } |
267 | ||
969ab2ee | 268 | static inline void usb_set_intfdata(struct usb_interface *intf, void *data) |
1da177e4 LT |
269 | { |
270 | dev_set_drvdata(&intf->dev, data); | |
271 | } | |
272 | ||
273 | struct usb_interface *usb_get_intf(struct usb_interface *intf); | |
274 | void usb_put_intf(struct usb_interface *intf); | |
275 | ||
8f5d3544 HG |
276 | /* Hard limit */ |
277 | #define USB_MAXENDPOINTS 30 | |
1da177e4 LT |
278 | /* this maximum is arbitrary */ |
279 | #define USB_MAXINTERFACES 32 | |
812219ab | 280 | #define USB_MAXIADS (USB_MAXINTERFACES/2) |
1da177e4 | 281 | |
62f0342d FB |
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 | ||
1da177e4 LT |
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 | |
21470e32 | 320 | * providing support for the /sys/kernel/debug/usb/devices pseudo-file. |
1da177e4 LT |
321 | */ |
322 | struct 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 */ | |
6bc3f397 | 328 | struct usb_host_interface altsetting[]; |
1da177e4 LT |
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. | |
3f423787 | 340 | * @intf_assoc: list of any interface association descriptors in this config |
1da177e4 LT |
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 | |
ded071f4 | 344 | * configuration is active. |
1da177e4 LT |
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 | |
312c004d | 370 | * desires (expressed through userspace tools). However, drivers can call |
1da177e4 LT |
371 | * usb_reset_configuration() to reinitialize the current configuration and |
372 | * all its interfaces. | |
373 | */ | |
374 | struct usb_host_config { | |
375 | struct usb_config_descriptor desc; | |
376 | ||
4f62efe6 | 377 | char *string; /* iConfiguration string, if present */ |
165fe97e CN |
378 | |
379 | /* List of any Interface Association Descriptors in this | |
380 | * configuration. */ | |
381 | struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS]; | |
382 | ||
1da177e4 LT |
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 | ||
3148bf04 AX |
395 | /* USB2.0 and USB3.0 device BOS descriptor set */ |
396 | struct 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; | |
3220befd | 402 | struct usb_ssp_cap_descriptor *ssp_cap; |
3148bf04 | 403 | struct usb_ss_container_id_descriptor *ss_id; |
faee822c | 404 | struct usb_ptm_cap_descriptor *ptm_cap; |
3148bf04 AX |
405 | }; |
406 | ||
1da177e4 | 407 | int __usb_get_extra_descriptor(char *buffer, unsigned size, |
704620af | 408 | unsigned char type, void **ptr, size_t min); |
969ab2ee GKH |
409 | #define usb_get_extra_descriptor(ifpoint, type, ptr) \ |
410 | __usb_get_extra_descriptor((ifpoint)->extra, \ | |
411 | (ifpoint)->extralen, \ | |
704620af | 412 | type, (void **)ptr, sizeof(**(ptr))) |
1da177e4 | 413 | |
b724ae77 | 414 | /* ----------------------------------------------------------------------- */ |
1da177e4 | 415 | |
1da177e4 LT |
416 | /* USB device number allocation bitmap */ |
417 | struct usb_devmap { | |
418 | unsigned long devicemap[128 / (8*sizeof(unsigned long))]; | |
419 | }; | |
420 | ||
421 | /* | |
422 | * Allocated per bus (tree of devices) we have: | |
423 | */ | |
424 | struct usb_bus { | |
c8d141ce | 425 | struct device *controller; /* host side hardware */ |
a8c06e40 | 426 | struct device *sysdev; /* as seen from firmware or bus */ |
1da177e4 | 427 | int busnum; /* Bus number (in order of reg) */ |
1b26da15 | 428 | const char *bus_name; /* stable id (PCI slot_name etc) */ |
07a8cdd2 AG |
429 | u8 uses_pio_for_control; /* |
430 | * Does the host controller use PIO | |
431 | * for control transfers? | |
432 | */ | |
1da177e4 LT |
433 | u8 otg_port; /* 0, or number of OTG/HNP port */ |
434 | unsigned is_b_host:1; /* true during some HNP roleswitches */ | |
435 | unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */ | |
19181bc5 HG |
436 | unsigned no_stop_on_short:1; /* |
437 | * Quirk: some controllers don't stop | |
438 | * the ep queue on a short transfer | |
439 | * with the URB_SHORT_NOT_OK flag set. | |
440 | */ | |
bcc48f1a | 441 | unsigned no_sg_constraint:1; /* no sg constraint */ |
4c1bd3d7 | 442 | unsigned sg_tablesize; /* 0 or largest number of sg list entries */ |
1da177e4 | 443 | |
b724ae77 AS |
444 | int devnum_next; /* Next open device number in |
445 | * round-robin allocation */ | |
feb26ac3 | 446 | struct mutex devnum_next_mutex; /* devnum_next mutex */ |
1da177e4 LT |
447 | |
448 | struct usb_devmap devmap; /* device address allocation map */ | |
1da177e4 | 449 | struct usb_device *root_hub; /* Root hub */ |
6d19c009 | 450 | struct usb_bus *hs_companion; /* Companion EHCI bus, if any */ |
1da177e4 LT |
451 | |
452 | int bandwidth_allocated; /* on this bus: how much of the time | |
453 | * reserved for periodic (intr/iso) | |
454 | * requests is used, on average? | |
455 | * Units: microseconds/frame. | |
456 | * Limits: Full/low speed reserve 90%, | |
457 | * while high speed reserves 80%. | |
458 | */ | |
459 | int bandwidth_int_reqs; /* number of Interrupt requests */ | |
460 | int bandwidth_isoc_reqs; /* number of Isoc. requests */ | |
461 | ||
da0aa716 AS |
462 | unsigned resuming_ports; /* bit array: resuming root-hub ports */ |
463 | ||
f150fa1a | 464 | #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE) |
1da177e4 LT |
465 | struct mon_bus *mon_bus; /* non-null when associated */ |
466 | int monitored; /* non-zero when monitored */ | |
467 | #endif | |
468 | }; | |
1da177e4 | 469 | |
9b6f0c4b | 470 | struct usb_dev_state; |
6080cd0e | 471 | |
b724ae77 | 472 | /* ----------------------------------------------------------------------- */ |
1da177e4 | 473 | |
1da177e4 LT |
474 | struct usb_tt; |
475 | ||
05f91689 LT |
476 | enum usb_port_connect_type { |
477 | USB_PORT_CONNECT_TYPE_UNKNOWN = 0, | |
478 | USB_PORT_CONNECT_TYPE_HOT_PLUG, | |
479 | USB_PORT_CONNECT_TYPE_HARD_WIRED, | |
480 | USB_PORT_NOT_USED, | |
481 | }; | |
482 | ||
25244227 NB |
483 | /* |
484 | * USB port quirks. | |
485 | */ | |
486 | ||
487 | /* For the given port, prefer the old (faster) enumeration scheme. */ | |
488 | #define USB_PORT_QUIRK_OLD_SCHEME BIT(0) | |
489 | ||
aa071a92 NB |
490 | /* Decrease TRSTRCY to 10ms during device enumeration. */ |
491 | #define USB_PORT_QUIRK_FAST_ENUM BIT(1) | |
492 | ||
17f34867 MN |
493 | /* |
494 | * USB 2.0 Link Power Management (LPM) parameters. | |
495 | */ | |
496 | struct usb2_lpm_parameters { | |
497 | /* Best effort service latency indicate how long the host will drive | |
498 | * resume on an exit from L1. | |
499 | */ | |
500 | unsigned int besl; | |
501 | ||
502 | /* Timeout value in microseconds for the L1 inactivity (LPM) timer. | |
503 | * When the timer counts to zero, the parent hub will initiate a LPM | |
504 | * transition to L1. | |
505 | */ | |
506 | int timeout; | |
507 | }; | |
508 | ||
51e0a012 SS |
509 | /* |
510 | * USB 3.0 Link Power Management (LPM) parameters. | |
511 | * | |
512 | * PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit. | |
513 | * MEL is the USB 3.0 Link PM latency for host-initiated LPM exit. | |
514 | * All three are stored in nanoseconds. | |
515 | */ | |
516 | struct usb3_lpm_parameters { | |
517 | /* | |
518 | * Maximum exit latency (MEL) for the host to send a packet to the | |
519 | * device (either a Ping for isoc endpoints, or a data packet for | |
520 | * interrupt endpoints), the hubs to decode the packet, and for all hubs | |
521 | * in the path to transition the links to U0. | |
522 | */ | |
523 | unsigned int mel; | |
524 | /* | |
525 | * Maximum exit latency for a device-initiated LPM transition to bring | |
526 | * all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB | |
527 | * 3.0 spec, with no explanation of what "P" stands for. "Path"? | |
528 | */ | |
529 | unsigned int pel; | |
530 | ||
531 | /* | |
532 | * The System Exit Latency (SEL) includes PEL, and three other | |
533 | * latencies. After a device initiates a U0 transition, it will take | |
534 | * some time from when the device sends the ERDY to when it will finally | |
535 | * receive the data packet. Basically, SEL should be the worse-case | |
536 | * latency from when a device starts initiating a U0 transition to when | |
537 | * it will get data. | |
538 | */ | |
539 | unsigned int sel; | |
1ea7e0e8 SS |
540 | /* |
541 | * The idle timeout value that is currently programmed into the parent | |
542 | * hub for this device. When the timer counts to zero, the parent hub | |
543 | * will initiate an LPM transition to either U1 or U2. | |
544 | */ | |
545 | int timeout; | |
51e0a012 SS |
546 | }; |
547 | ||
f476fbab | 548 | /** |
1da177e4 | 549 | * struct usb_device - kernel's representation of a USB device |
f476fbab RD |
550 | * @devnum: device number; address on a USB bus |
551 | * @devpath: device ID string for use in messages (e.g., /port/...) | |
7206b001 | 552 | * @route: tree topology hex string for use with xHCI |
f476fbab RD |
553 | * @state: device state: configured, not attached, etc. |
554 | * @speed: device speed: high/full/low (or error) | |
013eedb8 MN |
555 | * @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support |
556 | * @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support | |
0299809b | 557 | * @ssp_rate: SuperSpeed Plus phy signaling rate and lane count |
f476fbab RD |
558 | * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub |
559 | * @ttport: device port on that tt hub | |
560 | * @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints | |
561 | * @parent: our hub, unless we're the root | |
562 | * @bus: bus we're part of | |
563 | * @ep0: endpoint 0 data (default control pipe) | |
564 | * @dev: generic device interface | |
565 | * @descriptor: USB device descriptor | |
3148bf04 | 566 | * @bos: USB device BOS descriptor set |
f476fbab RD |
567 | * @config: all of the device's configs |
568 | * @actconfig: the active configuration | |
569 | * @ep_in: array of IN endpoints | |
570 | * @ep_out: array of OUT endpoints | |
571 | * @rawdescriptors: raw descriptors for each config | |
572 | * @bus_mA: Current available from the bus | |
573 | * @portnum: parent port number (origin 1) | |
574 | * @level: number of USB hub ancestors | |
4998f1ef | 575 | * @devaddr: device address, XHCI: assigned by HW, others: same as devnum |
f476fbab | 576 | * @can_submit: URBs may be submitted |
f476fbab RD |
577 | * @persist_enabled: USB_PERSIST enabled for this device |
578 | * @have_langid: whether string_langid is valid | |
579 | * @authorized: policy has said we can use it; | |
580 | * (user space) policy determines if we authorize this device to be | |
581 | * used or not. By default, wired USB devices are authorized. | |
582 | * WUSB devices are not, until we authorize them from user space. | |
583 | * FIXME -- complete doc | |
3b52f128 | 584 | * @authenticated: Crypto authentication passed |
f476fbab | 585 | * @wusb: device is Wireless USB |
1ff4df56 | 586 | * @lpm_capable: device supports LPM |
65580b43 | 587 | * @usb2_hw_lpm_capable: device can perform USB2 hardware LPM |
a558ccdc | 588 | * @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM |
de68bab4 SS |
589 | * @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled |
590 | * @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled | |
bf5ce5bf LB |
591 | * @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled |
592 | * @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled | |
f476fbab RD |
593 | * @string_langid: language ID for strings |
594 | * @product: iProduct string, if present (static) | |
595 | * @manufacturer: iManufacturer string, if present (static) | |
596 | * @serial: iSerialNumber string, if present (static) | |
597 | * @filelist: usbfs files that are open to this device | |
f476fbab | 598 | * @maxchild: number of ports if hub |
f476fbab RD |
599 | * @quirks: quirks of the whole device |
600 | * @urbnum: number of URBs submitted for the whole device | |
601 | * @active_duration: total time device is not suspended | |
f476fbab | 602 | * @connect_time: time device was first connected |
f476fbab RD |
603 | * @do_remote_wakeup: remote wakeup should be enabled |
604 | * @reset_resume: needs reset instead of resume | |
bfd1e910 | 605 | * @port_is_suspended: the upstream port is suspended (L2 or U3) |
11e76ae0 IPG |
606 | * @wusb_dev: if this is a Wireless USB device, link to the WUSB |
607 | * specific data for the device. | |
c6515272 | 608 | * @slot_id: Slot ID assigned by xHCI |
0846e7e9 | 609 | * @removable: Device can be physically removed from this port |
17f34867 | 610 | * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout. |
1ea7e0e8 SS |
611 | * @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout. |
612 | * @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout. | |
613 | * @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm() | |
614 | * to keep track of the number of functions that require USB 3.0 Link Power | |
615 | * Management to be disabled for this usb_device. This count should only | |
616 | * be manipulated by those functions, with the bandwidth_mutex is held. | |
886ee36e | 617 | * @hub_delay: cached value consisting of: |
43ff9869 | 618 | * parent->hub_delay + wHubDelay + tTPTransmissionDelay (40ns) |
886ee36e | 619 | * Will be used as wValue for SetIsochDelay requests. |
43ff9869 | 620 | * @use_generic_driver: ask driver core to reprobe using the generic driver. |
1da177e4 | 621 | * |
f476fbab | 622 | * Notes: |
1da177e4 LT |
623 | * Usbcore drivers should not set usbdev->state directly. Instead use |
624 | * usb_set_device_state(). | |
625 | */ | |
626 | struct usb_device { | |
f476fbab | 627 | int devnum; |
812219ab | 628 | char devpath[16]; |
7206b001 | 629 | u32 route; |
f476fbab RD |
630 | enum usb_device_state state; |
631 | enum usb_device_speed speed; | |
013eedb8 MN |
632 | unsigned int rx_lanes; |
633 | unsigned int tx_lanes; | |
0299809b | 634 | enum usb_ssp_rate ssp_rate; |
1da177e4 | 635 | |
f476fbab RD |
636 | struct usb_tt *tt; |
637 | int ttport; | |
1da177e4 | 638 | |
f476fbab | 639 | unsigned int toggle[2]; |
1da177e4 | 640 | |
f476fbab RD |
641 | struct usb_device *parent; |
642 | struct usb_bus *bus; | |
1da177e4 LT |
643 | struct usb_host_endpoint ep0; |
644 | ||
f476fbab | 645 | struct device dev; |
1da177e4 | 646 | |
f476fbab | 647 | struct usb_device_descriptor descriptor; |
3148bf04 | 648 | struct usb_host_bos *bos; |
f476fbab | 649 | struct usb_host_config *config; |
1da177e4 | 650 | |
f476fbab | 651 | struct usb_host_config *actconfig; |
1da177e4 LT |
652 | struct usb_host_endpoint *ep_in[16]; |
653 | struct usb_host_endpoint *ep_out[16]; | |
654 | ||
f476fbab | 655 | char **rawdescriptors; |
1da177e4 | 656 | |
f476fbab RD |
657 | unsigned short bus_mA; |
658 | u8 portnum; | |
659 | u8 level; | |
4998f1ef | 660 | u8 devaddr; |
55c52718 | 661 | |
f476fbab | 662 | unsigned can_submit:1; |
f476fbab RD |
663 | unsigned persist_enabled:1; |
664 | unsigned have_langid:1; | |
665 | unsigned authorized:1; | |
812219ab | 666 | unsigned authenticated:1; |
f476fbab | 667 | unsigned wusb:1; |
1ff4df56 | 668 | unsigned lpm_capable:1; |
65580b43 | 669 | unsigned usb2_hw_lpm_capable:1; |
a558ccdc | 670 | unsigned usb2_hw_lpm_besl_capable:1; |
65580b43 | 671 | unsigned usb2_hw_lpm_enabled:1; |
de68bab4 | 672 | unsigned usb2_hw_lpm_allowed:1; |
bf5ce5bf LB |
673 | unsigned usb3_lpm_u1_enabled:1; |
674 | unsigned usb3_lpm_u2_enabled:1; | |
f476fbab | 675 | int string_langid; |
1da177e4 | 676 | |
4f62efe6 | 677 | /* static strings from the device */ |
f476fbab RD |
678 | char *product; |
679 | char *manufacturer; | |
680 | char *serial; | |
4f62efe6 | 681 | |
1da177e4 | 682 | struct list_head filelist; |
1da177e4 | 683 | |
f476fbab | 684 | int maxchild; |
645daaab | 685 | |
f476fbab RD |
686 | u32 quirks; |
687 | atomic_t urbnum; | |
b5e795f8 | 688 | |
f476fbab | 689 | unsigned long active_duration; |
15123006 | 690 | |
645daaab | 691 | #ifdef CONFIG_PM |
f476fbab RD |
692 | unsigned long connect_time; |
693 | ||
f476fbab RD |
694 | unsigned do_remote_wakeup:1; |
695 | unsigned reset_resume:1; | |
bfd1e910 | 696 | unsigned port_is_suspended:1; |
645daaab | 697 | #endif |
b1d8dfb0 | 698 | struct wusb_dev *wusb_dev; |
c6515272 | 699 | int slot_id; |
17f34867 | 700 | struct usb2_lpm_parameters l1_params; |
51e0a012 SS |
701 | struct usb3_lpm_parameters u1_params; |
702 | struct usb3_lpm_parameters u2_params; | |
1ea7e0e8 | 703 | unsigned lpm_disable_count; |
886ee36e FB |
704 | |
705 | u16 hub_delay; | |
77419aa4 | 706 | unsigned use_generic_driver:1; |
1da177e4 LT |
707 | }; |
708 | #define to_usb_device(d) container_of(d, struct usb_device, dev) | |
709 | ||
1e429018 MW |
710 | static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf) |
711 | { | |
712 | return to_usb_device(intf->dev.parent); | |
713 | } | |
714 | ||
1da177e4 LT |
715 | extern struct usb_device *usb_get_dev(struct usb_device *dev); |
716 | extern void usb_put_dev(struct usb_device *dev); | |
ff823c79 LT |
717 | extern struct usb_device *usb_hub_find_child(struct usb_device *hdev, |
718 | int port1); | |
719 | ||
720 | /** | |
721 | * usb_hub_for_each_child - iterate over all child devices on the hub | |
722 | * @hdev: USB device belonging to the usb hub | |
723 | * @port1: portnum associated with child device | |
724 | * @child: child device pointer | |
725 | */ | |
726 | #define usb_hub_for_each_child(hdev, port1, child) \ | |
727 | for (port1 = 1, child = usb_hub_find_child(hdev, port1); \ | |
969ddcfc AS |
728 | port1 <= hdev->maxchild; \ |
729 | child = usb_hub_find_child(hdev, ++port1)) \ | |
730 | if (!child) continue; else | |
1da177e4 | 731 | |
9ad3d6cc | 732 | /* USB device locking */ |
7dd9cba5 ON |
733 | #define usb_lock_device(udev) device_lock(&(udev)->dev) |
734 | #define usb_unlock_device(udev) device_unlock(&(udev)->dev) | |
735 | #define usb_lock_device_interruptible(udev) device_lock_interruptible(&(udev)->dev) | |
736 | #define usb_trylock_device(udev) device_trylock(&(udev)->dev) | |
1da177e4 | 737 | extern int usb_lock_device_for_reset(struct usb_device *udev, |
095bc335 | 738 | const struct usb_interface *iface); |
1da177e4 LT |
739 | |
740 | /* USB port reset for device reinitialization */ | |
741 | extern int usb_reset_device(struct usb_device *dev); | |
dc023dce | 742 | extern void usb_queue_reset_device(struct usb_interface *dev); |
1da177e4 | 743 | |
659ab7a4 TZ |
744 | extern struct device *usb_intf_get_dma_device(struct usb_interface *intf); |
745 | ||
f7ac7787 LT |
746 | #ifdef CONFIG_ACPI |
747 | extern int usb_acpi_set_power_state(struct usb_device *hdev, int index, | |
748 | bool enable); | |
749 | extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index); | |
750 | #else | |
751 | static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index, | |
752 | bool enable) { return 0; } | |
753 | static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index) | |
754 | { return true; } | |
755 | #endif | |
1da177e4 | 756 | |
645daaab | 757 | /* USB autosuspend and autoresume */ |
ceb6c9c8 | 758 | #ifdef CONFIG_PM |
9e18c821 AS |
759 | extern void usb_enable_autosuspend(struct usb_device *udev); |
760 | extern void usb_disable_autosuspend(struct usb_device *udev); | |
088f7fec | 761 | |
645daaab AS |
762 | extern int usb_autopm_get_interface(struct usb_interface *intf); |
763 | extern void usb_autopm_put_interface(struct usb_interface *intf); | |
9ac39f28 AS |
764 | extern int usb_autopm_get_interface_async(struct usb_interface *intf); |
765 | extern void usb_autopm_put_interface_async(struct usb_interface *intf); | |
9bbdf1e0 AS |
766 | extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf); |
767 | extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf); | |
692a186c | 768 | |
1941044a AS |
769 | static inline void usb_mark_last_busy(struct usb_device *udev) |
770 | { | |
6ddf27cd | 771 | pm_runtime_mark_last_busy(&udev->dev); |
1941044a AS |
772 | } |
773 | ||
645daaab | 774 | #else |
645daaab | 775 | |
088f7fec AS |
776 | static inline int usb_enable_autosuspend(struct usb_device *udev) |
777 | { return 0; } | |
778 | static inline int usb_disable_autosuspend(struct usb_device *udev) | |
779 | { return 0; } | |
780 | ||
692a186c AS |
781 | static inline int usb_autopm_get_interface(struct usb_interface *intf) |
782 | { return 0; } | |
9ac39f28 AS |
783 | static inline int usb_autopm_get_interface_async(struct usb_interface *intf) |
784 | { return 0; } | |
785 | ||
692a186c AS |
786 | static inline void usb_autopm_put_interface(struct usb_interface *intf) |
787 | { } | |
9ac39f28 AS |
788 | static inline void usb_autopm_put_interface_async(struct usb_interface *intf) |
789 | { } | |
8e4ceb38 AS |
790 | static inline void usb_autopm_get_interface_no_resume( |
791 | struct usb_interface *intf) | |
692a186c | 792 | { } |
8e4ceb38 AS |
793 | static inline void usb_autopm_put_interface_no_suspend( |
794 | struct usb_interface *intf) | |
692a186c | 795 | { } |
1941044a AS |
796 | static inline void usb_mark_last_busy(struct usb_device *udev) |
797 | { } | |
692a186c | 798 | #endif |
645daaab | 799 | |
e9261fb6 SS |
800 | extern int usb_disable_lpm(struct usb_device *udev); |
801 | extern void usb_enable_lpm(struct usb_device *udev); | |
802 | /* Same as above, but these functions lock/unlock the bandwidth_mutex. */ | |
803 | extern int usb_unlocked_disable_lpm(struct usb_device *udev); | |
804 | extern void usb_unlocked_enable_lpm(struct usb_device *udev); | |
805 | ||
f74631e3 SS |
806 | extern int usb_disable_ltm(struct usb_device *udev); |
807 | extern void usb_enable_ltm(struct usb_device *udev); | |
808 | ||
024f117c SS |
809 | static inline bool usb_device_supports_ltm(struct usb_device *udev) |
810 | { | |
dd80b54b | 811 | if (udev->speed < USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) |
024f117c SS |
812 | return false; |
813 | return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; | |
814 | } | |
815 | ||
bcc48f1a ML |
816 | static inline bool usb_device_no_sg_constraint(struct usb_device *udev) |
817 | { | |
818 | return udev && udev->bus && udev->bus->no_sg_constraint; | |
819 | } | |
820 | ||
024f117c | 821 | |
1da177e4 LT |
822 | /*-------------------------------------------------------------------------*/ |
823 | ||
824 | /* for drivers using iso endpoints */ | |
969ab2ee | 825 | extern int usb_get_current_frame_number(struct usb_device *usb_dev); |
1da177e4 | 826 | |
eab1cafc SS |
827 | /* Sets up a group of bulk endpoints to support multiple stream IDs. */ |
828 | extern int usb_alloc_streams(struct usb_interface *interface, | |
829 | struct usb_host_endpoint **eps, unsigned int num_eps, | |
830 | unsigned int num_streams, gfp_t mem_flags); | |
831 | ||
832 | /* Reverts a group of bulk endpoints back to not using stream IDs. */ | |
6c74dada | 833 | extern int usb_free_streams(struct usb_interface *interface, |
eab1cafc SS |
834 | struct usb_host_endpoint **eps, unsigned int num_eps, |
835 | gfp_t mem_flags); | |
836 | ||
1da177e4 LT |
837 | /* used these for multi-interface device registration */ |
838 | extern int usb_driver_claim_interface(struct usb_driver *driver, | |
aaadc6ae | 839 | struct usb_interface *iface, void *data); |
1da177e4 LT |
840 | |
841 | /** | |
842 | * usb_interface_claimed - returns true iff an interface is claimed | |
843 | * @iface: the interface being checked | |
844 | * | |
626f090c YB |
845 | * Return: %true (nonzero) iff the interface is claimed, else %false |
846 | * (zero). | |
847 | * | |
848 | * Note: | |
1da177e4 LT |
849 | * Callers must own the driver model's usb bus readlock. So driver |
850 | * probe() entries don't need extra locking, but other call contexts | |
851 | * may need to explicitly claim that lock. | |
852 | * | |
853 | */ | |
969ab2ee GKH |
854 | static inline int usb_interface_claimed(struct usb_interface *iface) |
855 | { | |
1da177e4 LT |
856 | return (iface->dev.driver != NULL); |
857 | } | |
858 | ||
859 | extern void usb_driver_release_interface(struct usb_driver *driver, | |
860 | struct usb_interface *iface); | |
861 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
862 | const struct usb_device_id *id); | |
93bacefc GKH |
863 | extern int usb_match_one_id(struct usb_interface *interface, |
864 | const struct usb_device_id *id); | |
1da177e4 | 865 | |
9b790915 | 866 | extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)); |
1da177e4 LT |
867 | extern struct usb_interface *usb_find_interface(struct usb_driver *drv, |
868 | int minor); | |
095bc335 | 869 | extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
1da177e4 LT |
870 | unsigned ifnum); |
871 | extern struct usb_host_interface *usb_altnum_to_altsetting( | |
095bc335 | 872 | const struct usb_interface *intf, unsigned int altnum); |
91017f9c SS |
873 | extern struct usb_host_interface *usb_find_alt_setting( |
874 | struct usb_host_config *config, | |
875 | unsigned int iface_num, | |
876 | unsigned int alt_num); | |
1da177e4 | 877 | |
b433c4c7 HK |
878 | #if IS_REACHABLE(CONFIG_USB) |
879 | int usb_for_each_port(void *data, int (*fn)(struct device *, void *)); | |
880 | #else | |
881 | static inline int usb_for_each_port(void *data, int (*fn)(struct device *, void *)) | |
882 | { | |
883 | return 0; | |
884 | } | |
885 | #endif | |
886 | ||
6080cd0e VM |
887 | /* port claiming functions */ |
888 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 889 | struct usb_dev_state *owner); |
6080cd0e | 890 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 891 | struct usb_dev_state *owner); |
1da177e4 LT |
892 | |
893 | /** | |
894 | * usb_make_path - returns stable device path in the usb tree | |
895 | * @dev: the device whose path is being constructed | |
896 | * @buf: where to put the string | |
897 | * @size: how big is "buf"? | |
898 | * | |
626f090c | 899 | * Return: Length of the string (> 0) or negative if size was too small. |
1da177e4 | 900 | * |
626f090c | 901 | * Note: |
1da177e4 LT |
902 | * This identifier is intended to be "stable", reflecting physical paths in |
903 | * hardware such as physical bus addresses for host controllers or ports on | |
904 | * USB hubs. That makes it stay the same until systems are physically | |
905 | * reconfigured, by re-cabling a tree of USB devices or by moving USB host | |
906 | * controllers. Adding and removing devices, including virtual root hubs | |
25985edc | 907 | * in host controller driver modules, does not change these path identifiers; |
1da177e4 LT |
908 | * neither does rebooting or re-enumerating. These are more useful identifiers |
909 | * than changeable ("unstable") ones like bus numbers or device addresses. | |
910 | * | |
911 | * With a partial exception for devices connected to USB 2.0 root hubs, these | |
912 | * identifiers are also predictable. So long as the device tree isn't changed, | |
913 | * plugging any USB device into a given hub port always gives it the same path. | |
914 | * Because of the use of "companion" controllers, devices connected to ports on | |
915 | * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are | |
916 | * high speed, and a different one if they are full or low speed. | |
917 | */ | |
969ab2ee | 918 | static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size) |
1da177e4 LT |
919 | { |
920 | int actual; | |
969ab2ee GKH |
921 | actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name, |
922 | dev->devpath); | |
1da177e4 LT |
923 | return (actual >= (int)size) ? -1 : actual; |
924 | } | |
925 | ||
926 | /*-------------------------------------------------------------------------*/ | |
927 | ||
b724ae77 AS |
928 | #define USB_DEVICE_ID_MATCH_DEVICE \ |
929 | (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT) | |
930 | #define USB_DEVICE_ID_MATCH_DEV_RANGE \ | |
931 | (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI) | |
932 | #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \ | |
933 | (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE) | |
1da177e4 | 934 | #define USB_DEVICE_ID_MATCH_DEV_INFO \ |
b724ae77 AS |
935 | (USB_DEVICE_ID_MATCH_DEV_CLASS | \ |
936 | USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \ | |
937 | USB_DEVICE_ID_MATCH_DEV_PROTOCOL) | |
1da177e4 | 938 | #define USB_DEVICE_ID_MATCH_INT_INFO \ |
b724ae77 AS |
939 | (USB_DEVICE_ID_MATCH_INT_CLASS | \ |
940 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | \ | |
941 | USB_DEVICE_ID_MATCH_INT_PROTOCOL) | |
1da177e4 LT |
942 | |
943 | /** | |
944 | * USB_DEVICE - macro used to describe a specific usb device | |
945 | * @vend: the 16 bit USB Vendor ID | |
946 | * @prod: the 16 bit USB Product ID | |
947 | * | |
948 | * This macro is used to create a struct usb_device_id that matches a | |
949 | * specific device. | |
950 | */ | |
812219ab | 951 | #define USB_DEVICE(vend, prod) \ |
969ab2ee GKH |
952 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE, \ |
953 | .idVendor = (vend), \ | |
954 | .idProduct = (prod) | |
1da177e4 | 955 | /** |
d0bcabcd | 956 | * USB_DEVICE_VER - describe a specific usb device with a version range |
1da177e4 LT |
957 | * @vend: the 16 bit USB Vendor ID |
958 | * @prod: the 16 bit USB Product ID | |
959 | * @lo: the bcdDevice_lo value | |
960 | * @hi: the bcdDevice_hi value | |
961 | * | |
962 | * This macro is used to create a struct usb_device_id that matches a | |
963 | * specific device, with a version range. | |
964 | */ | |
969ab2ee | 965 | #define USB_DEVICE_VER(vend, prod, lo, hi) \ |
b724ae77 | 966 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \ |
969ab2ee GKH |
967 | .idVendor = (vend), \ |
968 | .idProduct = (prod), \ | |
969 | .bcdDevice_lo = (lo), \ | |
970 | .bcdDevice_hi = (hi) | |
1da177e4 | 971 | |
17b72feb BM |
972 | /** |
973 | * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class | |
974 | * @vend: the 16 bit USB Vendor ID | |
975 | * @prod: the 16 bit USB Product ID | |
976 | * @cl: bInterfaceClass value | |
977 | * | |
978 | * This macro is used to create a struct usb_device_id that matches a | |
979 | * specific interface class of devices. | |
980 | */ | |
981 | #define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \ | |
982 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ | |
983 | USB_DEVICE_ID_MATCH_INT_CLASS, \ | |
984 | .idVendor = (vend), \ | |
985 | .idProduct = (prod), \ | |
986 | .bInterfaceClass = (cl) | |
987 | ||
f836ac80 | 988 | /** |
d0bcabcd | 989 | * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol |
f836ac80 JK |
990 | * @vend: the 16 bit USB Vendor ID |
991 | * @prod: the 16 bit USB Product ID | |
992 | * @pr: bInterfaceProtocol value | |
993 | * | |
994 | * This macro is used to create a struct usb_device_id that matches a | |
995 | * specific interface protocol of devices. | |
996 | */ | |
969ab2ee GKH |
997 | #define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \ |
998 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ | |
999 | USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ | |
f836ac80 JK |
1000 | .idVendor = (vend), \ |
1001 | .idProduct = (prod), \ | |
1002 | .bInterfaceProtocol = (pr) | |
1003 | ||
81df2d59 BM |
1004 | /** |
1005 | * USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number | |
1006 | * @vend: the 16 bit USB Vendor ID | |
1007 | * @prod: the 16 bit USB Product ID | |
1008 | * @num: bInterfaceNumber value | |
1009 | * | |
1010 | * This macro is used to create a struct usb_device_id that matches a | |
1011 | * specific interface number of devices. | |
1012 | */ | |
1013 | #define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \ | |
1014 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ | |
1015 | USB_DEVICE_ID_MATCH_INT_NUMBER, \ | |
1016 | .idVendor = (vend), \ | |
1017 | .idProduct = (prod), \ | |
1018 | .bInterfaceNumber = (num) | |
1019 | ||
1da177e4 LT |
1020 | /** |
1021 | * USB_DEVICE_INFO - macro used to describe a class of usb devices | |
1022 | * @cl: bDeviceClass value | |
1023 | * @sc: bDeviceSubClass value | |
1024 | * @pr: bDeviceProtocol value | |
1025 | * | |
1026 | * This macro is used to create a struct usb_device_id that matches a | |
1027 | * specific class of devices. | |
1028 | */ | |
969ab2ee GKH |
1029 | #define USB_DEVICE_INFO(cl, sc, pr) \ |
1030 | .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \ | |
1031 | .bDeviceClass = (cl), \ | |
1032 | .bDeviceSubClass = (sc), \ | |
1033 | .bDeviceProtocol = (pr) | |
1da177e4 LT |
1034 | |
1035 | /** | |
969ab2ee | 1036 | * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces |
1da177e4 LT |
1037 | * @cl: bInterfaceClass value |
1038 | * @sc: bInterfaceSubClass value | |
1039 | * @pr: bInterfaceProtocol value | |
1040 | * | |
1041 | * This macro is used to create a struct usb_device_id that matches a | |
1042 | * specific class of interfaces. | |
1043 | */ | |
969ab2ee GKH |
1044 | #define USB_INTERFACE_INFO(cl, sc, pr) \ |
1045 | .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \ | |
1046 | .bInterfaceClass = (cl), \ | |
1047 | .bInterfaceSubClass = (sc), \ | |
1048 | .bInterfaceProtocol = (pr) | |
8538f96a DD |
1049 | |
1050 | /** | |
d0bcabcd | 1051 | * USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces |
8538f96a DD |
1052 | * @vend: the 16 bit USB Vendor ID |
1053 | * @prod: the 16 bit USB Product ID | |
1054 | * @cl: bInterfaceClass value | |
1055 | * @sc: bInterfaceSubClass value | |
1056 | * @pr: bInterfaceProtocol value | |
1057 | * | |
1058 | * This macro is used to create a struct usb_device_id that matches a | |
1059 | * specific device with a specific class of interfaces. | |
1060 | * | |
1061 | * This is especially useful when explicitly matching devices that have | |
1062 | * vendor specific bDeviceClass values, but standards-compliant interfaces. | |
1063 | */ | |
969ab2ee | 1064 | #define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \ |
8538f96a DD |
1065 | .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ |
1066 | | USB_DEVICE_ID_MATCH_DEVICE, \ | |
969ab2ee GKH |
1067 | .idVendor = (vend), \ |
1068 | .idProduct = (prod), \ | |
8538f96a | 1069 | .bInterfaceClass = (cl), \ |
969ab2ee GKH |
1070 | .bInterfaceSubClass = (sc), \ |
1071 | .bInterfaceProtocol = (pr) | |
1da177e4 | 1072 | |
d81a5d19 GP |
1073 | /** |
1074 | * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces | |
1075 | * @vend: the 16 bit USB Vendor ID | |
1076 | * @cl: bInterfaceClass value | |
1077 | * @sc: bInterfaceSubClass value | |
1078 | * @pr: bInterfaceProtocol value | |
1079 | * | |
1080 | * This macro is used to create a struct usb_device_id that matches a | |
1081 | * specific vendor with a specific class of interfaces. | |
1082 | * | |
1083 | * This is especially useful when explicitly matching devices that have | |
1084 | * vendor specific bDeviceClass values, but standards-compliant interfaces. | |
1085 | */ | |
1086 | #define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \ | |
1087 | .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ | |
1088 | | USB_DEVICE_ID_MATCH_VENDOR, \ | |
1089 | .idVendor = (vend), \ | |
1090 | .bInterfaceClass = (cl), \ | |
1091 | .bInterfaceSubClass = (sc), \ | |
1092 | .bInterfaceProtocol = (pr) | |
1093 | ||
b724ae77 | 1094 | /* ----------------------------------------------------------------------- */ |
1da177e4 | 1095 | |
93bacefc | 1096 | /* Stuff for dynamic usb ids */ |
733260ff GKH |
1097 | struct usb_dynids { |
1098 | spinlock_t lock; | |
1099 | struct list_head list; | |
1100 | }; | |
1101 | ||
93bacefc GKH |
1102 | struct usb_dynid { |
1103 | struct list_head node; | |
1104 | struct usb_device_id id; | |
1105 | }; | |
1106 | ||
1107 | extern ssize_t usb_store_new_id(struct usb_dynids *dynids, | |
2fc82c2d | 1108 | const struct usb_device_id *id_table, |
93bacefc GKH |
1109 | struct device_driver *driver, |
1110 | const char *buf, size_t count); | |
1111 | ||
ef206f3f BM |
1112 | extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); |
1113 | ||
1da177e4 | 1114 | /** |
8bb54ab5 AS |
1115 | * struct usbdrv_wrap - wrapper for driver-model structure |
1116 | * @driver: The driver-model core driver structure. | |
1117 | * @for_devices: Non-zero for device drivers, 0 for interface drivers. | |
1118 | */ | |
1119 | struct usbdrv_wrap { | |
1120 | struct device_driver driver; | |
1121 | int for_devices; | |
1122 | }; | |
1123 | ||
1124 | /** | |
1125 | * struct usb_driver - identifies USB interface driver to usbcore | |
1da177e4 LT |
1126 | * @name: The driver name should be unique among USB drivers, |
1127 | * and should normally be the same as the module name. | |
1128 | * @probe: Called to see if the driver is willing to manage a particular | |
1129 | * interface on a device. If it is, probe returns zero and uses | |
7ef4f060 | 1130 | * usb_set_intfdata() to associate driver-specific data with the |
1da177e4 LT |
1131 | * interface. It may also use usb_set_interface() to specify the |
1132 | * appropriate altsetting. If unwilling to manage the interface, | |
25985edc | 1133 | * return -ENODEV, if genuine IO errors occurred, an appropriate |
7ef4f060 | 1134 | * negative errno value. |
1da177e4 LT |
1135 | * @disconnect: Called when the interface is no longer accessible, usually |
1136 | * because its device has been (or is being) disconnected or the | |
1137 | * driver module is being unloaded. | |
a91be2ac | 1138 | * @unlocked_ioctl: Used for drivers that want to talk to userspace through |
1da177e4 LT |
1139 | * the "usbfs" filesystem. This lets devices provide ways to |
1140 | * expose information to user space regardless of where they | |
1141 | * do (or don't) show up otherwise in the filesystem. | |
303f0847 ML |
1142 | * @suspend: Called when the device is going to be suspended by the |
1143 | * system either from system sleep or runtime suspend context. The | |
1144 | * return value will be ignored in system sleep context, so do NOT | |
1145 | * try to continue using the device if suspend fails in this case. | |
1146 | * Instead, let the resume or reset-resume routine recover from | |
1147 | * the failure. | |
1da177e4 | 1148 | * @resume: Called when the device is being resumed by the system. |
f07600cf AS |
1149 | * @reset_resume: Called when the suspended device has been reset instead |
1150 | * of being resumed. | |
6498d9db AS |
1151 | * @pre_reset: Called by usb_reset_device() when the device is about to be |
1152 | * reset. This routine must not return until the driver has no active | |
1153 | * URBs for the device, and no more URBs may be submitted until the | |
1154 | * post_reset method is called. | |
742120c6 | 1155 | * @post_reset: Called by usb_reset_device() after the device |
7ef4f060 | 1156 | * has been reset |
1da177e4 LT |
1157 | * @id_table: USB drivers use ID table to support hotplugging. |
1158 | * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set | |
1159 | * or your driver's probe function will never get called. | |
b71b283e GKH |
1160 | * @dev_groups: Attributes attached to the device that will be created once it |
1161 | * is bound to the driver. | |
733260ff GKH |
1162 | * @dynids: used internally to hold the list of dynamically added device |
1163 | * ids for this driver. | |
8bb54ab5 | 1164 | * @drvwrap: Driver-model core structure wrapper. |
ba9dc657 GKH |
1165 | * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be |
1166 | * added to this driver by preventing the sysfs file from being created. | |
645daaab AS |
1167 | * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend |
1168 | * for interfaces bound to this driver. | |
9da82bd4 AS |
1169 | * @soft_unbind: if set to 1, the USB core will not kill URBs and disable |
1170 | * endpoints before calling the driver's disconnect method. | |
6fb650d4 | 1171 | * @disable_hub_initiated_lpm: if set to 1, the USB core will not allow hubs |
8afa408c SS |
1172 | * to initiate lower power link state transitions when an idle timeout |
1173 | * occurs. Device-initiated USB 3.0 link PM will still be allowed. | |
1da177e4 | 1174 | * |
8bb54ab5 AS |
1175 | * USB interface drivers must provide a name, probe() and disconnect() |
1176 | * methods, and an id_table. Other driver fields are optional. | |
1da177e4 LT |
1177 | * |
1178 | * The id_table is used in hotplugging. It holds a set of descriptors, | |
1179 | * and specialized data may be associated with each entry. That table | |
1180 | * is used by both user and kernel mode hotplugging support. | |
1181 | * | |
1182 | * The probe() and disconnect() methods are called in a context where | |
1183 | * they can sleep, but they should avoid abusing the privilege. Most | |
1184 | * work to connect to a device should be done when the device is opened, | |
1185 | * and undone at the last close. The disconnect code needs to address | |
1186 | * concurrency issues with respect to open() and close() methods, as | |
1187 | * well as forcing all pending I/O requests to complete (by unlinking | |
1188 | * them as necessary, and blocking until the unlinks complete). | |
1189 | */ | |
1190 | struct usb_driver { | |
1da177e4 LT |
1191 | const char *name; |
1192 | ||
1193 | int (*probe) (struct usb_interface *intf, | |
1194 | const struct usb_device_id *id); | |
1195 | ||
1196 | void (*disconnect) (struct usb_interface *intf); | |
1197 | ||
c532b29a | 1198 | int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code, |
b724ae77 | 1199 | void *buf); |
1da177e4 | 1200 | |
27d72e85 | 1201 | int (*suspend) (struct usb_interface *intf, pm_message_t message); |
1da177e4 | 1202 | int (*resume) (struct usb_interface *intf); |
f07600cf | 1203 | int (*reset_resume)(struct usb_interface *intf); |
1da177e4 | 1204 | |
f07600cf AS |
1205 | int (*pre_reset)(struct usb_interface *intf); |
1206 | int (*post_reset)(struct usb_interface *intf); | |
79efa097 | 1207 | |
1da177e4 | 1208 | const struct usb_device_id *id_table; |
b71b283e | 1209 | const struct attribute_group **dev_groups; |
1da177e4 | 1210 | |
733260ff | 1211 | struct usb_dynids dynids; |
8bb54ab5 | 1212 | struct usbdrv_wrap drvwrap; |
ba9dc657 | 1213 | unsigned int no_dynamic_id:1; |
645daaab | 1214 | unsigned int supports_autosuspend:1; |
8afa408c | 1215 | unsigned int disable_hub_initiated_lpm:1; |
9da82bd4 | 1216 | unsigned int soft_unbind:1; |
1da177e4 | 1217 | }; |
8bb54ab5 AS |
1218 | #define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver) |
1219 | ||
1220 | /** | |
1221 | * struct usb_device_driver - identifies USB device driver to usbcore | |
1222 | * @name: The driver name should be unique among USB drivers, | |
1223 | * and should normally be the same as the module name. | |
43ff9869 | 1224 | * @match: If set, used for better device/driver matching. |
8bb54ab5 AS |
1225 | * @probe: Called to see if the driver is willing to manage a particular |
1226 | * device. If it is, probe returns zero and uses dev_set_drvdata() | |
1227 | * to associate driver-specific data with the device. If unwilling | |
1228 | * to manage the device, return a negative errno value. | |
1229 | * @disconnect: Called when the device is no longer accessible, usually | |
1230 | * because it has been (or is being) disconnected or the driver's | |
1231 | * module is being unloaded. | |
1232 | * @suspend: Called when the device is going to be suspended by the system. | |
1233 | * @resume: Called when the device is being resumed by the system. | |
7d9c1d2f GKH |
1234 | * @dev_groups: Attributes attached to the device that will be created once it |
1235 | * is bound to the driver. | |
8bb54ab5 | 1236 | * @drvwrap: Driver-model core structure wrapper. |
43ff9869 RD |
1237 | * @id_table: used with @match() to select better matching driver at |
1238 | * probe() time. | |
645daaab AS |
1239 | * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend |
1240 | * for devices bound to this driver. | |
c9d50337 BN |
1241 | * @generic_subclass: if set to 1, the generic USB driver's probe, disconnect, |
1242 | * resume and suspend functions will be called in addition to the driver's | |
1243 | * own, so this part of the setup does not need to be replicated. | |
8bb54ab5 | 1244 | * |
43ff9869 RD |
1245 | * USB drivers must provide all the fields listed above except drvwrap, |
1246 | * match, and id_table. | |
8bb54ab5 AS |
1247 | */ |
1248 | struct usb_device_driver { | |
1249 | const char *name; | |
1250 | ||
88b7381a | 1251 | bool (*match) (struct usb_device *udev); |
8bb54ab5 AS |
1252 | int (*probe) (struct usb_device *udev); |
1253 | void (*disconnect) (struct usb_device *udev); | |
1254 | ||
1255 | int (*suspend) (struct usb_device *udev, pm_message_t message); | |
65bfd296 | 1256 | int (*resume) (struct usb_device *udev, pm_message_t message); |
7d9c1d2f | 1257 | const struct attribute_group **dev_groups; |
8bb54ab5 | 1258 | struct usbdrv_wrap drvwrap; |
88b7381a | 1259 | const struct usb_device_id *id_table; |
645daaab | 1260 | unsigned int supports_autosuspend:1; |
c9d50337 | 1261 | unsigned int generic_subclass:1; |
8bb54ab5 AS |
1262 | }; |
1263 | #define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \ | |
1264 | drvwrap.driver) | |
1da177e4 | 1265 | |
1da177e4 LT |
1266 | /** |
1267 | * struct usb_class_driver - identifies a USB driver that wants to use the USB major number | |
d6e5bcf4 | 1268 | * @name: the usb class device name for this driver. Will show up in sysfs. |
e454cea2 | 1269 | * @devnode: Callback to provide a naming hint for a possible |
e376bbbb | 1270 | * device node to create. |
1da177e4 | 1271 | * @fops: pointer to the struct file_operations of this driver. |
1da177e4 LT |
1272 | * @minor_base: the start of the minor range for this driver. |
1273 | * | |
1274 | * This structure is used for the usb_register_dev() and | |
864e2fe9 | 1275 | * usb_deregister_dev() functions, to consolidate a number of the |
1da177e4 LT |
1276 | * parameters used for them. |
1277 | */ | |
1278 | struct usb_class_driver { | |
1279 | char *name; | |
2c9ede55 | 1280 | char *(*devnode)(struct device *dev, umode_t *mode); |
99ac48f5 | 1281 | const struct file_operations *fops; |
d6e5bcf4 | 1282 | int minor_base; |
1da177e4 LT |
1283 | }; |
1284 | ||
1285 | /* | |
1286 | * use these in module_init()/module_exit() | |
1287 | * and don't forget MODULE_DEVICE_TABLE(usb, ...) | |
1288 | */ | |
80f745fb GKH |
1289 | extern int usb_register_driver(struct usb_driver *, struct module *, |
1290 | const char *); | |
eb5589a8 PG |
1291 | |
1292 | /* use a define to avoid include chaining to get THIS_MODULE & friends */ | |
1293 | #define usb_register(driver) \ | |
1294 | usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) | |
1295 | ||
1da177e4 LT |
1296 | extern void usb_deregister(struct usb_driver *); |
1297 | ||
f3a6a4b6 GKH |
1298 | /** |
1299 | * module_usb_driver() - Helper macro for registering a USB driver | |
1300 | * @__usb_driver: usb_driver struct | |
1301 | * | |
1302 | * Helper macro for USB drivers which do not do anything special in module | |
1303 | * init/exit. This eliminates a lot of boilerplate. Each module may only | |
1304 | * use this macro once, and calling it replaces module_init() and module_exit() | |
1305 | */ | |
1306 | #define module_usb_driver(__usb_driver) \ | |
1307 | module_driver(__usb_driver, usb_register, \ | |
1308 | usb_deregister) | |
1309 | ||
8bb54ab5 AS |
1310 | extern int usb_register_device_driver(struct usb_device_driver *, |
1311 | struct module *); | |
1312 | extern void usb_deregister_device_driver(struct usb_device_driver *); | |
1313 | ||
1da177e4 LT |
1314 | extern int usb_register_dev(struct usb_interface *intf, |
1315 | struct usb_class_driver *class_driver); | |
1316 | extern void usb_deregister_dev(struct usb_interface *intf, | |
1317 | struct usb_class_driver *class_driver); | |
1318 | ||
1319 | extern int usb_disabled(void); | |
1320 | ||
b724ae77 | 1321 | /* ----------------------------------------------------------------------- */ |
1da177e4 LT |
1322 | |
1323 | /* | |
1324 | * URB support, for asynchronous request completions | |
1325 | */ | |
1326 | ||
1327 | /* | |
1328 | * urb->transfer_flags: | |
fea34091 AS |
1329 | * |
1330 | * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb(). | |
1da177e4 LT |
1331 | */ |
1332 | #define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */ | |
a03bede5 AS |
1333 | #define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired |
1334 | * slot in the schedule */ | |
1da177e4 | 1335 | #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ |
b724ae77 AS |
1336 | #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ |
1337 | #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt | |
1338 | * needed */ | |
8b3b01c8 | 1339 | #define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */ |
1da177e4 | 1340 | |
ff9c895f | 1341 | /* The following flags are used internally by usbcore and HCDs */ |
fea34091 AS |
1342 | #define URB_DIR_IN 0x0200 /* Transfer from device to host */ |
1343 | #define URB_DIR_OUT 0 | |
1344 | #define URB_DIR_MASK URB_DIR_IN | |
1345 | ||
ff9c895f AS |
1346 | #define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */ |
1347 | #define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */ | |
1348 | #define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */ | |
1349 | #define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */ | |
1350 | #define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */ | |
1351 | #define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */ | |
1352 | #define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */ | |
2694a48d | 1353 | #define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */ |
ff9c895f | 1354 | |
1da177e4 LT |
1355 | struct usb_iso_packet_descriptor { |
1356 | unsigned int offset; | |
1357 | unsigned int length; /* expected length */ | |
1358 | unsigned int actual_length; | |
d1bbb600 | 1359 | int status; |
1da177e4 LT |
1360 | }; |
1361 | ||
1362 | struct urb; | |
1da177e4 | 1363 | |
51a2f077 ON |
1364 | struct usb_anchor { |
1365 | struct list_head urb_list; | |
1366 | wait_queue_head_t wait; | |
1367 | spinlock_t lock; | |
6ec4147e | 1368 | atomic_t suspend_wakeups; |
6a2839be | 1369 | unsigned int poisoned:1; |
51a2f077 ON |
1370 | }; |
1371 | ||
1372 | static inline void init_usb_anchor(struct usb_anchor *anchor) | |
1373 | { | |
9ef73dbd | 1374 | memset(anchor, 0, sizeof(*anchor)); |
51a2f077 ON |
1375 | INIT_LIST_HEAD(&anchor->urb_list); |
1376 | init_waitqueue_head(&anchor->wait); | |
1377 | spin_lock_init(&anchor->lock); | |
1378 | } | |
1379 | ||
7d12e780 | 1380 | typedef void (*usb_complete_t)(struct urb *); |
1da177e4 LT |
1381 | |
1382 | /** | |
1383 | * struct urb - USB Request Block | |
1384 | * @urb_list: For use by current owner of the URB. | |
51a2f077 ON |
1385 | * @anchor_list: membership in the list of an anchor |
1386 | * @anchor: to anchor URBs to a common mooring | |
5b653c79 AS |
1387 | * @ep: Points to the endpoint's data structure. Will eventually |
1388 | * replace @pipe. | |
1da177e4 LT |
1389 | * @pipe: Holds endpoint number, direction, type, and more. |
1390 | * Create these values with the eight macros available; | |
1391 | * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl" | |
1392 | * (control), "bulk", "int" (interrupt), or "iso" (isochronous). | |
1393 | * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint | |
1394 | * numbers range from zero to fifteen. Note that "in" endpoint two | |
1395 | * is a different endpoint (and pipe) from "out" endpoint two. | |
1396 | * The current configuration controls the existence, type, and | |
1397 | * maximum packet size of any given endpoint. | |
c6ba1c2a | 1398 | * @stream_id: the endpoint's stream ID for bulk streams |
1da177e4 LT |
1399 | * @dev: Identifies the USB device to perform the request. |
1400 | * @status: This is read in non-iso completion functions to get the | |
1401 | * status of the particular request. ISO requests only use it | |
1402 | * to tell whether the URB was unlinked; detailed status for | |
1403 | * each frame is in the fields of the iso_frame-desc. | |
1404 | * @transfer_flags: A variety of flags may be used to affect how URB | |
1405 | * submission, unlinking, or operation are handled. Different | |
1406 | * kinds of URB can use different flags. | |
4e9e9200 PZ |
1407 | * @transfer_buffer: This identifies the buffer to (or from) which the I/O |
1408 | * request will be performed unless URB_NO_TRANSFER_DMA_MAP is set | |
1409 | * (however, do not leave garbage in transfer_buffer even then). | |
1410 | * This buffer must be suitable for DMA; allocate it with | |
1da177e4 LT |
1411 | * kmalloc() or equivalent. For transfers to "in" endpoints, contents |
1412 | * of this buffer will be modified. This buffer is used for the data | |
1413 | * stage of control transfers. | |
1414 | * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP, | |
1415 | * the device driver is saying that it provided this DMA address, | |
1416 | * which the host controller driver should use in preference to the | |
1417 | * transfer_buffer. | |
10e232c5 ML |
1418 | * @sg: scatter gather buffer list, the buffer size of each element in |
1419 | * the list (except the last) must be divisible by the endpoint's | |
bcc48f1a | 1420 | * max packet size if no_sg_constraint isn't set in 'struct usb_bus' |
4d922612 | 1421 | * @num_mapped_sgs: (internal) number of mapped sg entries |
e376bbbb | 1422 | * @num_sgs: number of entries in the sg list |
1da177e4 LT |
1423 | * @transfer_buffer_length: How big is transfer_buffer. The transfer may |
1424 | * be broken up into chunks according to the current maximum packet | |
1425 | * size for the endpoint, which is a function of the configuration | |
1426 | * and is encoded in the pipe. When the length is zero, neither | |
1427 | * transfer_buffer nor transfer_dma is used. | |
1428 | * @actual_length: This is read in non-iso completion functions, and | |
1429 | * it tells how many bytes (out of transfer_buffer_length) were | |
1430 | * transferred. It will normally be the same as requested, unless | |
1431 | * either an error was reported or a short read was performed. | |
1432 | * The URB_SHORT_NOT_OK transfer flag may be used to make such | |
969ab2ee | 1433 | * short reads be reported as errors. |
1da177e4 LT |
1434 | * @setup_packet: Only used for control transfers, this points to eight bytes |
1435 | * of setup data. Control transfers always start by sending this data | |
1436 | * to the device. Then transfer_buffer is read or written, if needed. | |
85bcb5ee AS |
1437 | * @setup_dma: DMA pointer for the setup packet. The caller must not use |
1438 | * this field; setup_packet must point to a valid buffer. | |
1da177e4 LT |
1439 | * @start_frame: Returns the initial frame for isochronous transfers. |
1440 | * @number_of_packets: Lists the number of ISO transfer buffers. | |
1441 | * @interval: Specifies the polling interval for interrupt or isochronous | |
411c9403 | 1442 | * transfers. The units are frames (milliseconds) for full and low |
f09a15e6 MW |
1443 | * speed devices, and microframes (1/8 millisecond) for highspeed |
1444 | * and SuperSpeed devices. | |
1da177e4 LT |
1445 | * @error_count: Returns the number of ISO transfers that reported errors. |
1446 | * @context: For use in completion functions. This normally points to | |
1447 | * request-specific driver context. | |
1448 | * @complete: Completion handler. This URB is passed as the parameter to the | |
1449 | * completion function. The completion function may then do what | |
1450 | * it likes with the URB, including resubmitting or freeing it. | |
969ab2ee | 1451 | * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to |
1da177e4 LT |
1452 | * collect the transfer status for each buffer. |
1453 | * | |
1454 | * This structure identifies USB transfer requests. URBs must be allocated by | |
1455 | * calling usb_alloc_urb() and freed with a call to usb_free_urb(). | |
1456 | * Initialization may be done using various usb_fill_*_urb() functions. URBs | |
1457 | * are submitted using usb_submit_urb(), and pending requests may be canceled | |
1458 | * using usb_unlink_urb() or usb_kill_urb(). | |
1459 | * | |
1460 | * Data Transfer Buffers: | |
1461 | * | |
1462 | * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise | |
1463 | * taken from the general page pool. That is provided by transfer_buffer | |
1464 | * (control requests also use setup_packet), and host controller drivers | |
1465 | * perform a dma mapping (and unmapping) for each buffer transferred. Those | |
1466 | * mapping operations can be expensive on some platforms (perhaps using a dma | |
1467 | * bounce buffer or talking to an IOMMU), | |
1468 | * although they're cheap on commodity x86 and ppc hardware. | |
1469 | * | |
85bcb5ee AS |
1470 | * Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag, |
1471 | * which tells the host controller driver that no such mapping is needed for | |
1472 | * the transfer_buffer since | |
1da177e4 | 1473 | * the device driver is DMA-aware. For example, a device driver might |
073900a2 | 1474 | * allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map(). |
85bcb5ee AS |
1475 | * When this transfer flag is provided, host controller drivers will |
1476 | * attempt to use the dma address found in the transfer_dma | |
1477 | * field rather than determining a dma address themselves. | |
4e9e9200 PZ |
1478 | * |
1479 | * Note that transfer_buffer must still be set if the controller | |
edfbcb32 | 1480 | * does not support DMA (as indicated by hcd_uses_dma()) and when talking |
24bb0076 | 1481 | * to root hub. If you have to transfer between highmem zone and the device |
4e9e9200 PZ |
1482 | * on such controller, create a bounce buffer or bail out with an error. |
1483 | * If transfer_buffer cannot be set (is in highmem) and the controller is DMA | |
1484 | * capable, assign NULL to it, so that usbmon knows not to use the value. | |
1485 | * The setup_packet must always be set, so it cannot be located in highmem. | |
1da177e4 LT |
1486 | * |
1487 | * Initialization: | |
1488 | * | |
1489 | * All URBs submitted must initialize the dev, pipe, transfer_flags (may be | |
b375a049 | 1490 | * zero), and complete fields. All URBs must also initialize |
1da177e4 LT |
1491 | * transfer_buffer and transfer_buffer_length. They may provide the |
1492 | * URB_SHORT_NOT_OK transfer flag, indicating that short reads are | |
1493 | * to be treated as errors; that flag is invalid for write requests. | |
1494 | * | |
1495 | * Bulk URBs may | |
1496 | * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers | |
1497 | * should always terminate with a short packet, even if it means adding an | |
1498 | * extra zero length packet. | |
1499 | * | |
85bcb5ee AS |
1500 | * Control URBs must provide a valid pointer in the setup_packet field. |
1501 | * Unlike the transfer_buffer, the setup_packet may not be mapped for DMA | |
1502 | * beforehand. | |
1da177e4 LT |
1503 | * |
1504 | * Interrupt URBs must provide an interval, saying how often (in milliseconds | |
1505 | * or, for highspeed devices, 125 microsecond units) | |
1506 | * to poll for transfers. After the URB has been submitted, the interval | |
1507 | * field reflects how the transfer was actually scheduled. | |
1508 | * The polling interval may be more frequent than requested. | |
1509 | * For example, some controllers have a maximum interval of 32 milliseconds, | |
1510 | * while others support intervals of up to 1024 milliseconds. | |
1511 | * Isochronous URBs also have transfer intervals. (Note that for isochronous | |
1512 | * endpoints, as well as high speed interrupt endpoints, the encoding of | |
1513 | * the transfer interval in the endpoint descriptor is logarithmic. | |
1514 | * Device drivers must convert that value to linear units themselves.) | |
1515 | * | |
a03bede5 AS |
1516 | * If an isochronous endpoint queue isn't already running, the host |
1517 | * controller will schedule a new URB to start as soon as bandwidth | |
1518 | * utilization allows. If the queue is running then a new URB will be | |
1519 | * scheduled to start in the first transfer slot following the end of the | |
1520 | * preceding URB, if that slot has not already expired. If the slot has | |
1521 | * expired (which can happen when IRQ delivery is delayed for a long time), | |
1522 | * the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag | |
1523 | * is clear then the URB will be scheduled to start in the expired slot, | |
1524 | * implying that some of its packets will not be transferred; if the flag | |
1525 | * is set then the URB will be scheduled in the first unexpired slot, | |
1526 | * breaking the queue's synchronization. Upon URB completion, the | |
1527 | * start_frame field will be set to the (micro)frame number in which the | |
1528 | * transfer was scheduled. Ranges for frame counter values are HC-specific | |
1529 | * and can go from as low as 256 to as high as 65536 frames. | |
1da177e4 LT |
1530 | * |
1531 | * Isochronous URBs have a different data transfer model, in part because | |
1532 | * the quality of service is only "best effort". Callers provide specially | |
1533 | * allocated URBs, with number_of_packets worth of iso_frame_desc structures | |
1534 | * at the end. Each such packet is an individual ISO transfer. Isochronous | |
1535 | * URBs are normally queued, submitted by drivers to arrange that | |
1536 | * transfers are at least double buffered, and then explicitly resubmitted | |
1537 | * in completion handlers, so | |
1538 | * that data (such as audio or video) streams at as constant a rate as the | |
1539 | * host controller scheduler can support. | |
1540 | * | |
1541 | * Completion Callbacks: | |
1542 | * | |
1543 | * The completion callback is made in_interrupt(), and one of the first | |
1544 | * things that a completion handler should do is check the status field. | |
1545 | * The status field is provided for all URBs. It is used to report | |
1546 | * unlinked URBs, and status for all non-ISO transfers. It should not | |
1547 | * be examined before the URB is returned to the completion handler. | |
1548 | * | |
1549 | * The context field is normally used to link URBs back to the relevant | |
1550 | * driver or request state. | |
1551 | * | |
1552 | * When the completion callback is invoked for non-isochronous URBs, the | |
1553 | * actual_length field tells how many bytes were transferred. This field | |
1554 | * is updated even when the URB terminated with an error or was unlinked. | |
1555 | * | |
1556 | * ISO transfer status is reported in the status and actual_length fields | |
1557 | * of the iso_frame_desc array, and the number of errors is reported in | |
1558 | * error_count. Completion callbacks for ISO transfers will normally | |
1559 | * (re)submit URBs to ensure a constant transfer rate. | |
719df469 RK |
1560 | * |
1561 | * Note that even fields marked "public" should not be touched by the driver | |
1562 | * when the urb is owned by the hcd, that is, since the call to | |
1563 | * usb_submit_urb() till the entry into the completion routine. | |
1da177e4 | 1564 | */ |
969ab2ee | 1565 | struct urb { |
aeec46b9 | 1566 | /* private: usb core and host controller only fields in the urb */ |
1da177e4 | 1567 | struct kref kref; /* reference count of the URB */ |
8e6b8594 | 1568 | int unlinked; /* unlink error code */ |
1da177e4 | 1569 | void *hcpriv; /* private data for host controller */ |
1da177e4 | 1570 | atomic_t use_count; /* concurrent submissions counter */ |
49367d8f | 1571 | atomic_t reject; /* submissions will fail */ |
1da177e4 | 1572 | |
aeec46b9 | 1573 | /* public: documented fields in the urb that can be used by drivers */ |
b724ae77 AS |
1574 | struct list_head urb_list; /* list head for use by the urb's |
1575 | * current owner */ | |
969ab2ee | 1576 | struct list_head anchor_list; /* the URB may be anchored */ |
51a2f077 | 1577 | struct usb_anchor *anchor; |
812219ab | 1578 | struct usb_device *dev; /* (in) pointer to associated device */ |
969ab2ee | 1579 | struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */ |
1da177e4 | 1580 | unsigned int pipe; /* (in) pipe information */ |
94af1220 | 1581 | unsigned int stream_id; /* (in) stream ID */ |
1da177e4 LT |
1582 | int status; /* (return) non-ISO status */ |
1583 | unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/ | |
1584 | void *transfer_buffer; /* (in) associated data buffer */ | |
1585 | dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */ | |
910f8d0c | 1586 | struct scatterlist *sg; /* (in) scatter gather buffer list */ |
bc677d5b | 1587 | int num_mapped_sgs; /* (internal) mapped sg entries */ |
e04748e3 | 1588 | int num_sgs; /* (in) number of entries in the sg list */ |
16e2e5f6 | 1589 | u32 transfer_buffer_length; /* (in) data buffer length */ |
8c209e67 | 1590 | u32 actual_length; /* (return) actual transfer length */ |
1da177e4 LT |
1591 | unsigned char *setup_packet; /* (in) setup packet (control only) */ |
1592 | dma_addr_t setup_dma; /* (in) dma addr for setup_packet */ | |
1593 | int start_frame; /* (modify) start frame (ISO) */ | |
1594 | int number_of_packets; /* (in) number of ISO packets */ | |
b724ae77 AS |
1595 | int interval; /* (modify) transfer interval |
1596 | * (INT/ISO) */ | |
1da177e4 LT |
1597 | int error_count; /* (return) number of ISO errors */ |
1598 | void *context; /* (in) context for completion */ | |
1599 | usb_complete_t complete; /* (in) completion routine */ | |
6bc3f397 | 1600 | struct usb_iso_packet_descriptor iso_frame_desc[]; |
b724ae77 | 1601 | /* (in) ISO ONLY */ |
1da177e4 LT |
1602 | }; |
1603 | ||
b724ae77 | 1604 | /* ----------------------------------------------------------------------- */ |
1da177e4 LT |
1605 | |
1606 | /** | |
1607 | * usb_fill_control_urb - initializes a control urb | |
1608 | * @urb: pointer to the urb to initialize. | |
1609 | * @dev: pointer to the struct usb_device for this urb. | |
1610 | * @pipe: the endpoint pipe | |
1611 | * @setup_packet: pointer to the setup_packet buffer | |
1612 | * @transfer_buffer: pointer to the transfer buffer | |
1613 | * @buffer_length: length of the transfer buffer | |
3d5b2510 | 1614 | * @complete_fn: pointer to the usb_complete_t function |
1da177e4 LT |
1615 | * @context: what to set the urb context to. |
1616 | * | |
1617 | * Initializes a control urb with the proper information needed to submit | |
1618 | * it to a device. | |
1619 | */ | |
969ab2ee GKH |
1620 | static inline void usb_fill_control_urb(struct urb *urb, |
1621 | struct usb_device *dev, | |
1622 | unsigned int pipe, | |
1623 | unsigned char *setup_packet, | |
1624 | void *transfer_buffer, | |
1625 | int buffer_length, | |
1626 | usb_complete_t complete_fn, | |
1627 | void *context) | |
1da177e4 | 1628 | { |
1da177e4 LT |
1629 | urb->dev = dev; |
1630 | urb->pipe = pipe; | |
1631 | urb->setup_packet = setup_packet; | |
1632 | urb->transfer_buffer = transfer_buffer; | |
1633 | urb->transfer_buffer_length = buffer_length; | |
3d5b2510 | 1634 | urb->complete = complete_fn; |
1da177e4 LT |
1635 | urb->context = context; |
1636 | } | |
1637 | ||
1638 | /** | |
1639 | * usb_fill_bulk_urb - macro to help initialize a bulk urb | |
1640 | * @urb: pointer to the urb to initialize. | |
1641 | * @dev: pointer to the struct usb_device for this urb. | |
1642 | * @pipe: the endpoint pipe | |
1643 | * @transfer_buffer: pointer to the transfer buffer | |
1644 | * @buffer_length: length of the transfer buffer | |
3d5b2510 | 1645 | * @complete_fn: pointer to the usb_complete_t function |
1da177e4 LT |
1646 | * @context: what to set the urb context to. |
1647 | * | |
1648 | * Initializes a bulk urb with the proper information needed to submit it | |
1649 | * to a device. | |
1650 | */ | |
969ab2ee GKH |
1651 | static inline void usb_fill_bulk_urb(struct urb *urb, |
1652 | struct usb_device *dev, | |
1653 | unsigned int pipe, | |
1654 | void *transfer_buffer, | |
1655 | int buffer_length, | |
1656 | usb_complete_t complete_fn, | |
1657 | void *context) | |
1da177e4 | 1658 | { |
1da177e4 LT |
1659 | urb->dev = dev; |
1660 | urb->pipe = pipe; | |
1661 | urb->transfer_buffer = transfer_buffer; | |
1662 | urb->transfer_buffer_length = buffer_length; | |
3d5b2510 | 1663 | urb->complete = complete_fn; |
1da177e4 LT |
1664 | urb->context = context; |
1665 | } | |
1666 | ||
1667 | /** | |
1668 | * usb_fill_int_urb - macro to help initialize a interrupt urb | |
1669 | * @urb: pointer to the urb to initialize. | |
1670 | * @dev: pointer to the struct usb_device for this urb. | |
1671 | * @pipe: the endpoint pipe | |
1672 | * @transfer_buffer: pointer to the transfer buffer | |
1673 | * @buffer_length: length of the transfer buffer | |
3d5b2510 | 1674 | * @complete_fn: pointer to the usb_complete_t function |
1da177e4 LT |
1675 | * @context: what to set the urb context to. |
1676 | * @interval: what to set the urb interval to, encoded like | |
1677 | * the endpoint descriptor's bInterval value. | |
1678 | * | |
1679 | * Initializes a interrupt urb with the proper information needed to submit | |
1680 | * it to a device. | |
f09a15e6 | 1681 | * |
fca504f6 | 1682 | * Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic |
f09a15e6 MW |
1683 | * encoding of the endpoint interval, and express polling intervals in |
1684 | * microframes (eight per millisecond) rather than in frames (one per | |
1685 | * millisecond). | |
1686 | * | |
1687 | * Wireless USB also uses the logarithmic encoding, but specifies it in units of | |
1688 | * 128us instead of 125us. For Wireless USB devices, the interval is passed | |
1689 | * through to the host controller, rather than being translated into microframe | |
1690 | * units. | |
1da177e4 | 1691 | */ |
969ab2ee GKH |
1692 | static inline void usb_fill_int_urb(struct urb *urb, |
1693 | struct usb_device *dev, | |
1694 | unsigned int pipe, | |
1695 | void *transfer_buffer, | |
1696 | int buffer_length, | |
1697 | usb_complete_t complete_fn, | |
1698 | void *context, | |
1699 | int interval) | |
1da177e4 | 1700 | { |
1da177e4 LT |
1701 | urb->dev = dev; |
1702 | urb->pipe = pipe; | |
1703 | urb->transfer_buffer = transfer_buffer; | |
1704 | urb->transfer_buffer_length = buffer_length; | |
3d5b2510 | 1705 | urb->complete = complete_fn; |
1da177e4 | 1706 | urb->context = context; |
42189d85 | 1707 | |
fca504f6 | 1708 | if (dev->speed == USB_SPEED_HIGH || dev->speed >= USB_SPEED_SUPER) { |
42189d85 FB |
1709 | /* make sure interval is within allowed range */ |
1710 | interval = clamp(interval, 1, 16); | |
1711 | ||
1da177e4 | 1712 | urb->interval = 1 << (interval - 1); |
42189d85 | 1713 | } else { |
1da177e4 | 1714 | urb->interval = interval; |
42189d85 FB |
1715 | } |
1716 | ||
1da177e4 LT |
1717 | urb->start_frame = -1; |
1718 | } | |
1719 | ||
1720 | extern void usb_init_urb(struct urb *urb); | |
55016f10 | 1721 | extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags); |
1da177e4 LT |
1722 | extern void usb_free_urb(struct urb *urb); |
1723 | #define usb_put_urb usb_free_urb | |
1724 | extern struct urb *usb_get_urb(struct urb *urb); | |
55016f10 | 1725 | extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags); |
1da177e4 LT |
1726 | extern int usb_unlink_urb(struct urb *urb); |
1727 | extern void usb_kill_urb(struct urb *urb); | |
55b447bf ON |
1728 | extern void usb_poison_urb(struct urb *urb); |
1729 | extern void usb_unpoison_urb(struct urb *urb); | |
8815bb09 | 1730 | extern void usb_block_urb(struct urb *urb); |
51a2f077 | 1731 | extern void usb_kill_anchored_urbs(struct usb_anchor *anchor); |
6a2839be | 1732 | extern void usb_poison_anchored_urbs(struct usb_anchor *anchor); |
856395d6 | 1733 | extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor); |
eda76959 | 1734 | extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor); |
6ec4147e HG |
1735 | extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor); |
1736 | extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor); | |
51a2f077 ON |
1737 | extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor); |
1738 | extern void usb_unanchor_urb(struct urb *urb); | |
1739 | extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, | |
1740 | unsigned int timeout); | |
19876252 ON |
1741 | extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor); |
1742 | extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor); | |
1743 | extern int usb_anchor_empty(struct usb_anchor *anchor); | |
1da177e4 | 1744 | |
8815bb09 ON |
1745 | #define usb_unblock_urb usb_unpoison_urb |
1746 | ||
fea34091 AS |
1747 | /** |
1748 | * usb_urb_dir_in - check if an URB describes an IN transfer | |
1749 | * @urb: URB to be checked | |
1750 | * | |
626f090c | 1751 | * Return: 1 if @urb describes an IN transfer (device-to-host), |
fea34091 AS |
1752 | * otherwise 0. |
1753 | */ | |
1754 | static inline int usb_urb_dir_in(struct urb *urb) | |
1755 | { | |
d617bc83 | 1756 | return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN; |
fea34091 AS |
1757 | } |
1758 | ||
1759 | /** | |
1760 | * usb_urb_dir_out - check if an URB describes an OUT transfer | |
1761 | * @urb: URB to be checked | |
1762 | * | |
626f090c | 1763 | * Return: 1 if @urb describes an OUT transfer (host-to-device), |
fea34091 AS |
1764 | * otherwise 0. |
1765 | */ | |
1766 | static inline int usb_urb_dir_out(struct urb *urb) | |
1767 | { | |
1768 | return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT; | |
1769 | } | |
1770 | ||
fcc2cc1f | 1771 | int usb_pipe_type_check(struct usb_device *dev, unsigned int pipe); |
e901b987 TI |
1772 | int usb_urb_ep_type_check(const struct urb *urb); |
1773 | ||
073900a2 | 1774 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, |
55016f10 | 1775 | gfp_t mem_flags, dma_addr_t *dma); |
073900a2 | 1776 | void usb_free_coherent(struct usb_device *dev, size_t size, |
1da177e4 LT |
1777 | void *addr, dma_addr_t dma); |
1778 | ||
1779 | #if 0 | |
969ab2ee GKH |
1780 | struct urb *usb_buffer_map(struct urb *urb); |
1781 | void usb_buffer_dmasync(struct urb *urb); | |
1782 | void usb_buffer_unmap(struct urb *urb); | |
1da177e4 LT |
1783 | #endif |
1784 | ||
1785 | struct scatterlist; | |
5e60a161 | 1786 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 1787 | struct scatterlist *sg, int nents); |
1da177e4 | 1788 | #if 0 |
5e60a161 | 1789 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 1790 | struct scatterlist *sg, int n_hw_ents); |
1da177e4 | 1791 | #endif |
5e60a161 | 1792 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 1793 | struct scatterlist *sg, int n_hw_ents); |
1da177e4 LT |
1794 | |
1795 | /*-------------------------------------------------------------------* | |
1796 | * SYNCHRONOUS CALL SUPPORT * | |
1797 | *-------------------------------------------------------------------*/ | |
1798 | ||
1799 | extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, | |
1800 | __u8 request, __u8 requesttype, __u16 value, __u16 index, | |
1801 | void *data, __u16 size, int timeout); | |
782a7a63 GKH |
1802 | extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, |
1803 | void *data, int len, int *actual_length, int timeout); | |
1da177e4 LT |
1804 | extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, |
1805 | void *data, int len, int *actual_length, | |
1806 | int timeout); | |
1807 | ||
1da177e4 | 1808 | /* wrappers around usb_control_msg() for the most common standard requests */ |
719b8f28 GKH |
1809 | int usb_control_msg_send(struct usb_device *dev, __u8 endpoint, __u8 request, |
1810 | __u8 requesttype, __u16 value, __u16 index, | |
ddd1198e ON |
1811 | const void *data, __u16 size, int timeout, |
1812 | gfp_t memflags); | |
719b8f28 GKH |
1813 | int usb_control_msg_recv(struct usb_device *dev, __u8 endpoint, __u8 request, |
1814 | __u8 requesttype, __u16 value, __u16 index, | |
ddd1198e ON |
1815 | void *data, __u16 size, int timeout, |
1816 | gfp_t memflags); | |
1da177e4 LT |
1817 | extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype, |
1818 | unsigned char descindex, void *buf, int size); | |
1819 | extern int usb_get_status(struct usb_device *dev, | |
2e43f0fe | 1820 | int recip, int type, int target, void *data); |
d9e1e148 FB |
1821 | |
1822 | static inline int usb_get_std_status(struct usb_device *dev, | |
1823 | int recip, int target, void *data) | |
1824 | { | |
2e43f0fe FB |
1825 | return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target, |
1826 | data); | |
d9e1e148 FB |
1827 | } |
1828 | ||
f8f3e4ac FB |
1829 | static inline int usb_get_ptm_status(struct usb_device *dev, void *data) |
1830 | { | |
1831 | return usb_get_status(dev, USB_RECIP_DEVICE, USB_STATUS_TYPE_PTM, | |
1832 | 0, data); | |
1833 | } | |
1834 | ||
1da177e4 LT |
1835 | extern int usb_string(struct usb_device *dev, int index, |
1836 | char *buf, size_t size); | |
1837 | ||
1838 | /* wrappers that also update important state inside usbcore */ | |
1839 | extern int usb_clear_halt(struct usb_device *dev, int pipe); | |
1840 | extern int usb_reset_configuration(struct usb_device *dev); | |
1841 | extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); | |
3444b26a | 1842 | extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); |
1da177e4 | 1843 | |
088dc270 AS |
1844 | /* this request isn't really synchronous, but it belongs with the others */ |
1845 | extern int usb_driver_set_configuration(struct usb_device *udev, int config); | |
1846 | ||
b7945b77 VM |
1847 | /* choose and set configuration for device */ |
1848 | extern int usb_choose_configuration(struct usb_device *udev); | |
1849 | extern int usb_set_configuration(struct usb_device *dev, int configuration); | |
1850 | ||
1da177e4 LT |
1851 | /* |
1852 | * timeouts, in milliseconds, used for sending/receiving control messages | |
1853 | * they typically complete within a few frames (msec) after they're issued | |
1854 | * USB identifies 5 second timeouts, maybe more in a few cases, and a few | |
1855 | * slow devices (like some MGE Ellipse UPSes) actually push that limit. | |
1856 | */ | |
1857 | #define USB_CTRL_GET_TIMEOUT 5000 | |
1858 | #define USB_CTRL_SET_TIMEOUT 5000 | |
1859 | ||
1860 | ||
1861 | /** | |
1862 | * struct usb_sg_request - support for scatter/gather I/O | |
1863 | * @status: zero indicates success, else negative errno | |
1864 | * @bytes: counts bytes transferred. | |
1865 | * | |
1866 | * These requests are initialized using usb_sg_init(), and then are used | |
1867 | * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most | |
1868 | * members of the request object aren't for driver access. | |
1869 | * | |
1870 | * The status and bytecount values are valid only after usb_sg_wait() | |
1871 | * returns. If the status is zero, then the bytecount matches the total | |
1872 | * from the request. | |
1873 | * | |
1874 | * After an error completion, drivers may need to clear a halt condition | |
1875 | * on the endpoint. | |
1876 | */ | |
1877 | struct usb_sg_request { | |
1878 | int status; | |
1879 | size_t bytes; | |
1880 | ||
bf92c190 RD |
1881 | /* private: |
1882 | * members below are private to usbcore, | |
1da177e4 LT |
1883 | * and are not provided for driver access! |
1884 | */ | |
1885 | spinlock_t lock; | |
1886 | ||
1887 | struct usb_device *dev; | |
1888 | int pipe; | |
1da177e4 LT |
1889 | |
1890 | int entries; | |
1891 | struct urb **urbs; | |
1892 | ||
1893 | int count; | |
1894 | struct completion complete; | |
1895 | }; | |
1896 | ||
969ab2ee | 1897 | int usb_sg_init( |
1da177e4 LT |
1898 | struct usb_sg_request *io, |
1899 | struct usb_device *dev, | |
969ab2ee | 1900 | unsigned pipe, |
1da177e4 LT |
1901 | unsigned period, |
1902 | struct scatterlist *sg, | |
1903 | int nents, | |
1904 | size_t length, | |
55016f10 | 1905 | gfp_t mem_flags |
1da177e4 | 1906 | ); |
969ab2ee GKH |
1907 | void usb_sg_cancel(struct usb_sg_request *io); |
1908 | void usb_sg_wait(struct usb_sg_request *io); | |
1da177e4 LT |
1909 | |
1910 | ||
b724ae77 | 1911 | /* ----------------------------------------------------------------------- */ |
1da177e4 LT |
1912 | |
1913 | /* | |
1914 | * For various legacy reasons, Linux has a small cookie that's paired with | |
1915 | * a struct usb_device to identify an endpoint queue. Queue characteristics | |
1916 | * are defined by the endpoint's descriptor. This cookie is called a "pipe", | |
1917 | * an unsigned int encoded as: | |
1918 | * | |
1919 | * - direction: bit 7 (0 = Host-to-Device [Out], | |
1920 | * 1 = Device-to-Host [In] ... | |
1921 | * like endpoint bEndpointAddress) | |
1922 | * - device address: bits 8-14 ... bit positions known to uhci-hcd | |
1923 | * - endpoint: bits 15-18 ... bit positions known to uhci-hcd | |
1924 | * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt, | |
1925 | * 10 = control, 11 = bulk) | |
1926 | * | |
1927 | * Given the device address and endpoint descriptor, pipes are redundant. | |
1928 | */ | |
1929 | ||
1930 | /* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */ | |
1931 | /* (yet ... they're the values used by usbfs) */ | |
1932 | #define PIPE_ISOCHRONOUS 0 | |
1933 | #define PIPE_INTERRUPT 1 | |
1934 | #define PIPE_CONTROL 2 | |
1935 | #define PIPE_BULK 3 | |
1936 | ||
1937 | #define usb_pipein(pipe) ((pipe) & USB_DIR_IN) | |
1938 | #define usb_pipeout(pipe) (!usb_pipein(pipe)) | |
1939 | ||
1940 | #define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f) | |
1941 | #define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf) | |
1942 | ||
1943 | #define usb_pipetype(pipe) (((pipe) >> 30) & 3) | |
1944 | #define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS) | |
1945 | #define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT) | |
1946 | #define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL) | |
1947 | #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK) | |
1948 | ||
b724ae77 AS |
1949 | static inline unsigned int __create_pipe(struct usb_device *dev, |
1950 | unsigned int endpoint) | |
1da177e4 LT |
1951 | { |
1952 | return (dev->devnum << 8) | (endpoint << 15); | |
1953 | } | |
1954 | ||
1955 | /* Create various pipes... */ | |
812219ab | 1956 | #define usb_sndctrlpipe(dev, endpoint) \ |
969ab2ee | 1957 | ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint)) |
812219ab | 1958 | #define usb_rcvctrlpipe(dev, endpoint) \ |
969ab2ee | 1959 | ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
812219ab | 1960 | #define usb_sndisocpipe(dev, endpoint) \ |
969ab2ee | 1961 | ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint)) |
812219ab | 1962 | #define usb_rcvisocpipe(dev, endpoint) \ |
969ab2ee | 1963 | ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
812219ab | 1964 | #define usb_sndbulkpipe(dev, endpoint) \ |
969ab2ee | 1965 | ((PIPE_BULK << 30) | __create_pipe(dev, endpoint)) |
812219ab | 1966 | #define usb_rcvbulkpipe(dev, endpoint) \ |
969ab2ee | 1967 | ((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
812219ab | 1968 | #define usb_sndintpipe(dev, endpoint) \ |
969ab2ee | 1969 | ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint)) |
812219ab | 1970 | #define usb_rcvintpipe(dev, endpoint) \ |
969ab2ee | 1971 | ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
1da177e4 | 1972 | |
fe54b058 MW |
1973 | static inline struct usb_host_endpoint * |
1974 | usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe) | |
1975 | { | |
1976 | struct usb_host_endpoint **eps; | |
1977 | eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out; | |
1978 | return eps[usb_pipeendpoint(pipe)]; | |
1979 | } | |
1980 | ||
1da177e4 LT |
1981 | /*-------------------------------------------------------------------------*/ |
1982 | ||
1983 | static inline __u16 | |
1984 | usb_maxpacket(struct usb_device *udev, int pipe, int is_out) | |
1985 | { | |
1986 | struct usb_host_endpoint *ep; | |
1987 | unsigned epnum = usb_pipeendpoint(pipe); | |
1988 | ||
1989 | if (is_out) { | |
1990 | WARN_ON(usb_pipein(pipe)); | |
1991 | ep = udev->ep_out[epnum]; | |
1992 | } else { | |
1993 | WARN_ON(usb_pipeout(pipe)); | |
1994 | ep = udev->ep_in[epnum]; | |
1995 | } | |
1996 | if (!ep) | |
1997 | return 0; | |
1998 | ||
1999 | /* NOTE: only 0x07ff bits are for packet size... */ | |
29cc8897 | 2000 | return usb_endpoint_maxp(&ep->desc); |
1da177e4 LT |
2001 | } |
2002 | ||
b724ae77 | 2003 | /* ----------------------------------------------------------------------- */ |
1da177e4 | 2004 | |
2c4d6bf2 JH |
2005 | /* translate USB error codes to codes user space understands */ |
2006 | static inline int usb_translate_errors(int error_code) | |
2007 | { | |
2008 | switch (error_code) { | |
2009 | case 0: | |
2010 | case -ENOMEM: | |
2011 | case -ENODEV: | |
67c88382 | 2012 | case -EOPNOTSUPP: |
2c4d6bf2 JH |
2013 | return error_code; |
2014 | default: | |
2015 | return -EIO; | |
2016 | } | |
2017 | } | |
2018 | ||
3099e75a GKH |
2019 | /* Events from the usb core */ |
2020 | #define USB_DEVICE_ADD 0x0001 | |
2021 | #define USB_DEVICE_REMOVE 0x0002 | |
2022 | #define USB_BUS_ADD 0x0003 | |
2023 | #define USB_BUS_REMOVE 0x0004 | |
2024 | extern void usb_register_notify(struct notifier_block *nb); | |
2025 | extern void usb_unregister_notify(struct notifier_block *nb); | |
2026 | ||
00048b8b GKH |
2027 | /* debugfs stuff */ |
2028 | extern struct dentry *usb_debug_root; | |
2029 | ||
0cfbd328 MS |
2030 | /* LED triggers */ |
2031 | enum usb_led_event { | |
2032 | USB_LED_EVENT_HOST = 0, | |
2033 | USB_LED_EVENT_GADGET = 1, | |
2034 | }; | |
2035 | ||
2036 | #ifdef CONFIG_USB_LED_TRIG | |
2037 | extern void usb_led_activity(enum usb_led_event ev); | |
2038 | #else | |
2039 | static inline void usb_led_activity(enum usb_led_event ev) {} | |
2040 | #endif | |
2041 | ||
1da177e4 LT |
2042 | #endif /* __KERNEL__ */ |
2043 | ||
2044 | #endif |