Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * (C) Copyright Linus Torvalds 1999 | |
3 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
4 | * (C) Copyright Andreas Gal 1999 | |
5 | * (C) Copyright Gregory P. Smith 1999 | |
6 | * (C) Copyright Deti Fliegl 1999 | |
7 | * (C) Copyright Randy Dunlap 2000 | |
8 | * (C) Copyright David Brownell 2000-2002 | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
17 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | * for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software Foundation, | |
22 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/version.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/completion.h> | |
30 | #include <linux/utsname.h> | |
31 | #include <linux/mm.h> | |
32 | #include <asm/io.h> | |
1da177e4 LT |
33 | #include <linux/device.h> |
34 | #include <linux/dma-mapping.h> | |
4186ecf8 | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | #include <asm/irq.h> |
37 | #include <asm/byteorder.h> | |
b3476675 | 38 | #include <asm/unaligned.h> |
64a21d02 | 39 | #include <linux/platform_device.h> |
6b157c9b | 40 | #include <linux/workqueue.h> |
1da177e4 LT |
41 | |
42 | #include <linux/usb.h> | |
43 | ||
44 | #include "usb.h" | |
45 | #include "hcd.h" | |
46 | #include "hub.h" | |
47 | ||
48 | ||
1da177e4 LT |
49 | /*-------------------------------------------------------------------------*/ |
50 | ||
51 | /* | |
52 | * USB Host Controller Driver framework | |
53 | * | |
54 | * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing | |
55 | * HCD-specific behaviors/bugs. | |
56 | * | |
57 | * This does error checks, tracks devices and urbs, and delegates to a | |
58 | * "hc_driver" only for code (and data) that really needs to know about | |
59 | * hardware differences. That includes root hub registers, i/o queues, | |
60 | * and so on ... but as little else as possible. | |
61 | * | |
62 | * Shared code includes most of the "root hub" code (these are emulated, | |
63 | * though each HC's hardware works differently) and PCI glue, plus request | |
64 | * tracking overhead. The HCD code should only block on spinlocks or on | |
65 | * hardware handshaking; blocking on software events (such as other kernel | |
66 | * threads releasing resources, or completing actions) is all generic. | |
67 | * | |
68 | * Happens the USB 2.0 spec says this would be invisible inside the "USBD", | |
69 | * and includes mostly a "HCDI" (HCD Interface) along with some APIs used | |
70 | * only by the hub driver ... and that neither should be seen or used by | |
71 | * usb client device drivers. | |
72 | * | |
73 | * Contributors of ideas or unattributed patches include: David Brownell, | |
74 | * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ... | |
75 | * | |
76 | * HISTORY: | |
77 | * 2002-02-21 Pull in most of the usb_bus support from usb.c; some | |
78 | * associated cleanup. "usb_hcd" still != "usb_bus". | |
79 | * 2001-12-12 Initial patch version for Linux 2.5.1 kernel. | |
80 | */ | |
81 | ||
82 | /*-------------------------------------------------------------------------*/ | |
83 | ||
84 | /* host controllers we manage */ | |
85 | LIST_HEAD (usb_bus_list); | |
86 | EXPORT_SYMBOL_GPL (usb_bus_list); | |
87 | ||
88 | /* used when allocating bus numbers */ | |
89 | #define USB_MAXBUS 64 | |
90 | struct usb_busmap { | |
91 | unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))]; | |
92 | }; | |
93 | static struct usb_busmap busmap; | |
94 | ||
95 | /* used when updating list of hcds */ | |
4186ecf8 | 96 | DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */ |
1da177e4 LT |
97 | EXPORT_SYMBOL_GPL (usb_bus_list_lock); |
98 | ||
99 | /* used for controlling access to virtual root hubs */ | |
100 | static DEFINE_SPINLOCK(hcd_root_hub_lock); | |
101 | ||
809a58b8 AS |
102 | /* used when updating an endpoint's URB list */ |
103 | static DEFINE_SPINLOCK(hcd_urb_list_lock); | |
1da177e4 LT |
104 | |
105 | /* wait queue for synchronous unlinks */ | |
106 | DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue); | |
107 | ||
809a58b8 AS |
108 | static inline int is_root_hub(struct usb_device *udev) |
109 | { | |
110 | return (udev->parent == NULL); | |
111 | } | |
112 | ||
1da177e4 LT |
113 | /*-------------------------------------------------------------------------*/ |
114 | ||
115 | /* | |
116 | * Sharable chunks of root hub code. | |
117 | */ | |
118 | ||
119 | /*-------------------------------------------------------------------------*/ | |
120 | ||
121 | #define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff) | |
122 | #define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff) | |
123 | ||
124 | /* usb 2.0 root hub device descriptor */ | |
125 | static const u8 usb2_rh_dev_descriptor [18] = { | |
126 | 0x12, /* __u8 bLength; */ | |
127 | 0x01, /* __u8 bDescriptorType; Device */ | |
128 | 0x00, 0x02, /* __le16 bcdUSB; v2.0 */ | |
129 | ||
130 | 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ | |
131 | 0x00, /* __u8 bDeviceSubClass; */ | |
132 | 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/ | |
16f16d11 | 133 | 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */ |
1da177e4 LT |
134 | |
135 | 0x00, 0x00, /* __le16 idVendor; */ | |
136 | 0x00, 0x00, /* __le16 idProduct; */ | |
137 | KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ | |
138 | ||
139 | 0x03, /* __u8 iManufacturer; */ | |
140 | 0x02, /* __u8 iProduct; */ | |
141 | 0x01, /* __u8 iSerialNumber; */ | |
142 | 0x01 /* __u8 bNumConfigurations; */ | |
143 | }; | |
144 | ||
145 | /* no usb 2.0 root hub "device qualifier" descriptor: one speed only */ | |
146 | ||
147 | /* usb 1.1 root hub device descriptor */ | |
148 | static const u8 usb11_rh_dev_descriptor [18] = { | |
149 | 0x12, /* __u8 bLength; */ | |
150 | 0x01, /* __u8 bDescriptorType; Device */ | |
151 | 0x10, 0x01, /* __le16 bcdUSB; v1.1 */ | |
152 | ||
153 | 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ | |
154 | 0x00, /* __u8 bDeviceSubClass; */ | |
155 | 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */ | |
16f16d11 | 156 | 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */ |
1da177e4 LT |
157 | |
158 | 0x00, 0x00, /* __le16 idVendor; */ | |
159 | 0x00, 0x00, /* __le16 idProduct; */ | |
160 | KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */ | |
161 | ||
162 | 0x03, /* __u8 iManufacturer; */ | |
163 | 0x02, /* __u8 iProduct; */ | |
164 | 0x01, /* __u8 iSerialNumber; */ | |
165 | 0x01 /* __u8 bNumConfigurations; */ | |
166 | }; | |
167 | ||
168 | ||
169 | /*-------------------------------------------------------------------------*/ | |
170 | ||
171 | /* Configuration descriptors for our root hubs */ | |
172 | ||
173 | static const u8 fs_rh_config_descriptor [] = { | |
174 | ||
175 | /* one configuration */ | |
176 | 0x09, /* __u8 bLength; */ | |
177 | 0x02, /* __u8 bDescriptorType; Configuration */ | |
178 | 0x19, 0x00, /* __le16 wTotalLength; */ | |
179 | 0x01, /* __u8 bNumInterfaces; (1) */ | |
180 | 0x01, /* __u8 bConfigurationValue; */ | |
181 | 0x00, /* __u8 iConfiguration; */ | |
182 | 0xc0, /* __u8 bmAttributes; | |
183 | Bit 7: must be set, | |
184 | 6: Self-powered, | |
185 | 5: Remote wakeup, | |
186 | 4..0: resvd */ | |
187 | 0x00, /* __u8 MaxPower; */ | |
188 | ||
189 | /* USB 1.1: | |
190 | * USB 2.0, single TT organization (mandatory): | |
191 | * one interface, protocol 0 | |
192 | * | |
193 | * USB 2.0, multiple TT organization (optional): | |
194 | * two interfaces, protocols 1 (like single TT) | |
195 | * and 2 (multiple TT mode) ... config is | |
196 | * sometimes settable | |
197 | * NOT IMPLEMENTED | |
198 | */ | |
199 | ||
200 | /* one interface */ | |
201 | 0x09, /* __u8 if_bLength; */ | |
202 | 0x04, /* __u8 if_bDescriptorType; Interface */ | |
203 | 0x00, /* __u8 if_bInterfaceNumber; */ | |
204 | 0x00, /* __u8 if_bAlternateSetting; */ | |
205 | 0x01, /* __u8 if_bNumEndpoints; */ | |
206 | 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ | |
207 | 0x00, /* __u8 if_bInterfaceSubClass; */ | |
208 | 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */ | |
209 | 0x00, /* __u8 if_iInterface; */ | |
210 | ||
211 | /* one endpoint (status change endpoint) */ | |
212 | 0x07, /* __u8 ep_bLength; */ | |
213 | 0x05, /* __u8 ep_bDescriptorType; Endpoint */ | |
214 | 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ | |
215 | 0x03, /* __u8 ep_bmAttributes; Interrupt */ | |
216 | 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */ | |
217 | 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */ | |
218 | }; | |
219 | ||
220 | static const u8 hs_rh_config_descriptor [] = { | |
221 | ||
222 | /* one configuration */ | |
223 | 0x09, /* __u8 bLength; */ | |
224 | 0x02, /* __u8 bDescriptorType; Configuration */ | |
225 | 0x19, 0x00, /* __le16 wTotalLength; */ | |
226 | 0x01, /* __u8 bNumInterfaces; (1) */ | |
227 | 0x01, /* __u8 bConfigurationValue; */ | |
228 | 0x00, /* __u8 iConfiguration; */ | |
229 | 0xc0, /* __u8 bmAttributes; | |
230 | Bit 7: must be set, | |
231 | 6: Self-powered, | |
232 | 5: Remote wakeup, | |
233 | 4..0: resvd */ | |
234 | 0x00, /* __u8 MaxPower; */ | |
235 | ||
236 | /* USB 1.1: | |
237 | * USB 2.0, single TT organization (mandatory): | |
238 | * one interface, protocol 0 | |
239 | * | |
240 | * USB 2.0, multiple TT organization (optional): | |
241 | * two interfaces, protocols 1 (like single TT) | |
242 | * and 2 (multiple TT mode) ... config is | |
243 | * sometimes settable | |
244 | * NOT IMPLEMENTED | |
245 | */ | |
246 | ||
247 | /* one interface */ | |
248 | 0x09, /* __u8 if_bLength; */ | |
249 | 0x04, /* __u8 if_bDescriptorType; Interface */ | |
250 | 0x00, /* __u8 if_bInterfaceNumber; */ | |
251 | 0x00, /* __u8 if_bAlternateSetting; */ | |
252 | 0x01, /* __u8 if_bNumEndpoints; */ | |
253 | 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ | |
254 | 0x00, /* __u8 if_bInterfaceSubClass; */ | |
255 | 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */ | |
256 | 0x00, /* __u8 if_iInterface; */ | |
257 | ||
258 | /* one endpoint (status change endpoint) */ | |
259 | 0x07, /* __u8 ep_bLength; */ | |
260 | 0x05, /* __u8 ep_bDescriptorType; Endpoint */ | |
261 | 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ | |
262 | 0x03, /* __u8 ep_bmAttributes; Interrupt */ | |
88fafff9 | 263 | /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) |
264 | * see hub.c:hub_configure() for details. */ | |
265 | (USB_MAXCHILDREN + 1 + 7) / 8, 0x00, | |
1da177e4 LT |
266 | 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */ |
267 | }; | |
268 | ||
269 | /*-------------------------------------------------------------------------*/ | |
270 | ||
271 | /* | |
272 | * helper routine for returning string descriptors in UTF-16LE | |
273 | * input can actually be ISO-8859-1; ASCII is its 7-bit subset | |
274 | */ | |
275 | static int ascii2utf (char *s, u8 *utf, int utfmax) | |
276 | { | |
277 | int retval; | |
278 | ||
279 | for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) { | |
280 | *utf++ = *s++; | |
281 | *utf++ = 0; | |
282 | } | |
283 | if (utfmax > 0) { | |
284 | *utf = *s; | |
285 | ++retval; | |
286 | } | |
287 | return retval; | |
288 | } | |
289 | ||
290 | /* | |
291 | * rh_string - provides manufacturer, product and serial strings for root hub | |
292 | * @id: the string ID number (1: serial number, 2: product, 3: vendor) | |
293 | * @hcd: the host controller for this root hub | |
294 | * @type: string describing our driver | |
295 | * @data: return packet in UTF-16 LE | |
296 | * @len: length of the return packet | |
297 | * | |
298 | * Produces either a manufacturer, product or serial number string for the | |
299 | * virtual root hub device. | |
300 | */ | |
301 | static int rh_string ( | |
302 | int id, | |
303 | struct usb_hcd *hcd, | |
304 | u8 *data, | |
305 | int len | |
306 | ) { | |
307 | char buf [100]; | |
308 | ||
309 | // language ids | |
310 | if (id == 0) { | |
311 | buf[0] = 4; buf[1] = 3; /* 4 bytes string data */ | |
312 | buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */ | |
313 | len = min (len, 4); | |
314 | memcpy (data, buf, len); | |
315 | return len; | |
316 | ||
317 | // serial number | |
318 | } else if (id == 1) { | |
319 | strlcpy (buf, hcd->self.bus_name, sizeof buf); | |
320 | ||
321 | // product description | |
322 | } else if (id == 2) { | |
323 | strlcpy (buf, hcd->product_desc, sizeof buf); | |
324 | ||
325 | // id 3 == vendor description | |
326 | } else if (id == 3) { | |
96b644bd SH |
327 | snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname, |
328 | init_utsname()->release, hcd->driver->description); | |
1da177e4 LT |
329 | |
330 | // unsupported IDs --> "protocol stall" | |
331 | } else | |
332 | return -EPIPE; | |
333 | ||
334 | switch (len) { /* All cases fall through */ | |
335 | default: | |
336 | len = 2 + ascii2utf (buf, data + 2, len - 2); | |
337 | case 2: | |
338 | data [1] = 3; /* type == string */ | |
339 | case 1: | |
340 | data [0] = 2 * (strlen (buf) + 1); | |
341 | case 0: | |
342 | ; /* Compiler wants a statement here */ | |
343 | } | |
344 | return len; | |
345 | } | |
346 | ||
347 | ||
348 | /* Root hub control transfers execute synchronously */ | |
349 | static int rh_call_control (struct usb_hcd *hcd, struct urb *urb) | |
350 | { | |
351 | struct usb_ctrlrequest *cmd; | |
352 | u16 typeReq, wValue, wIndex, wLength; | |
353 | u8 *ubuf = urb->transfer_buffer; | |
54bee6e1 MP |
354 | u8 tbuf [sizeof (struct usb_hub_descriptor)] |
355 | __attribute__((aligned(4))); | |
1da177e4 LT |
356 | const u8 *bufp = tbuf; |
357 | int len = 0; | |
358 | int patch_wakeup = 0; | |
e9df41c5 | 359 | int status; |
1da177e4 LT |
360 | int n; |
361 | ||
9439eb94 AS |
362 | might_sleep(); |
363 | ||
e9df41c5 AS |
364 | spin_lock_irq(&hcd_root_hub_lock); |
365 | status = usb_hcd_link_urb_to_ep(hcd, urb); | |
366 | spin_unlock_irq(&hcd_root_hub_lock); | |
367 | if (status) | |
368 | return status; | |
b0d9efba | 369 | urb->hcpriv = hcd; /* Indicate it's queued */ |
e9df41c5 | 370 | |
1da177e4 LT |
371 | cmd = (struct usb_ctrlrequest *) urb->setup_packet; |
372 | typeReq = (cmd->bRequestType << 8) | cmd->bRequest; | |
373 | wValue = le16_to_cpu (cmd->wValue); | |
374 | wIndex = le16_to_cpu (cmd->wIndex); | |
375 | wLength = le16_to_cpu (cmd->wLength); | |
376 | ||
377 | if (wLength > urb->transfer_buffer_length) | |
378 | goto error; | |
379 | ||
380 | urb->actual_length = 0; | |
381 | switch (typeReq) { | |
382 | ||
383 | /* DEVICE REQUESTS */ | |
384 | ||
fb669cc0 DB |
385 | /* The root hub's remote wakeup enable bit is implemented using |
386 | * driver model wakeup flags. If this system supports wakeup | |
387 | * through USB, userspace may change the default "allow wakeup" | |
388 | * policy through sysfs or these calls. | |
389 | * | |
390 | * Most root hubs support wakeup from downstream devices, for | |
391 | * runtime power management (disabling USB clocks and reducing | |
392 | * VBUS power usage). However, not all of them do so; silicon, | |
393 | * board, and BIOS bugs here are not uncommon, so these can't | |
394 | * be treated quite like external hubs. | |
395 | * | |
396 | * Likewise, not all root hubs will pass wakeup events upstream, | |
397 | * to wake up the whole system. So don't assume root hub and | |
398 | * controller capabilities are identical. | |
399 | */ | |
400 | ||
1da177e4 | 401 | case DeviceRequest | USB_REQ_GET_STATUS: |
fb669cc0 DB |
402 | tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev) |
403 | << USB_DEVICE_REMOTE_WAKEUP) | |
1da177e4 LT |
404 | | (1 << USB_DEVICE_SELF_POWERED); |
405 | tbuf [1] = 0; | |
406 | len = 2; | |
407 | break; | |
408 | case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: | |
409 | if (wValue == USB_DEVICE_REMOTE_WAKEUP) | |
fb669cc0 | 410 | device_set_wakeup_enable(&hcd->self.root_hub->dev, 0); |
1da177e4 LT |
411 | else |
412 | goto error; | |
413 | break; | |
414 | case DeviceOutRequest | USB_REQ_SET_FEATURE: | |
fb669cc0 DB |
415 | if (device_can_wakeup(&hcd->self.root_hub->dev) |
416 | && wValue == USB_DEVICE_REMOTE_WAKEUP) | |
417 | device_set_wakeup_enable(&hcd->self.root_hub->dev, 1); | |
1da177e4 LT |
418 | else |
419 | goto error; | |
420 | break; | |
421 | case DeviceRequest | USB_REQ_GET_CONFIGURATION: | |
422 | tbuf [0] = 1; | |
423 | len = 1; | |
424 | /* FALLTHROUGH */ | |
425 | case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: | |
426 | break; | |
427 | case DeviceRequest | USB_REQ_GET_DESCRIPTOR: | |
428 | switch (wValue & 0xff00) { | |
429 | case USB_DT_DEVICE << 8: | |
430 | if (hcd->driver->flags & HCD_USB2) | |
431 | bufp = usb2_rh_dev_descriptor; | |
432 | else if (hcd->driver->flags & HCD_USB11) | |
433 | bufp = usb11_rh_dev_descriptor; | |
434 | else | |
435 | goto error; | |
436 | len = 18; | |
437 | break; | |
438 | case USB_DT_CONFIG << 8: | |
439 | if (hcd->driver->flags & HCD_USB2) { | |
440 | bufp = hs_rh_config_descriptor; | |
441 | len = sizeof hs_rh_config_descriptor; | |
442 | } else { | |
443 | bufp = fs_rh_config_descriptor; | |
444 | len = sizeof fs_rh_config_descriptor; | |
445 | } | |
fb669cc0 | 446 | if (device_can_wakeup(&hcd->self.root_hub->dev)) |
1da177e4 LT |
447 | patch_wakeup = 1; |
448 | break; | |
449 | case USB_DT_STRING << 8: | |
450 | n = rh_string (wValue & 0xff, hcd, ubuf, wLength); | |
451 | if (n < 0) | |
452 | goto error; | |
453 | urb->actual_length = n; | |
454 | break; | |
455 | default: | |
456 | goto error; | |
457 | } | |
458 | break; | |
459 | case DeviceRequest | USB_REQ_GET_INTERFACE: | |
460 | tbuf [0] = 0; | |
461 | len = 1; | |
462 | /* FALLTHROUGH */ | |
463 | case DeviceOutRequest | USB_REQ_SET_INTERFACE: | |
464 | break; | |
465 | case DeviceOutRequest | USB_REQ_SET_ADDRESS: | |
466 | // wValue == urb->dev->devaddr | |
467 | dev_dbg (hcd->self.controller, "root hub device address %d\n", | |
468 | wValue); | |
469 | break; | |
470 | ||
471 | /* INTERFACE REQUESTS (no defined feature/status flags) */ | |
472 | ||
473 | /* ENDPOINT REQUESTS */ | |
474 | ||
475 | case EndpointRequest | USB_REQ_GET_STATUS: | |
476 | // ENDPOINT_HALT flag | |
477 | tbuf [0] = 0; | |
478 | tbuf [1] = 0; | |
479 | len = 2; | |
480 | /* FALLTHROUGH */ | |
481 | case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: | |
482 | case EndpointOutRequest | USB_REQ_SET_FEATURE: | |
483 | dev_dbg (hcd->self.controller, "no endpoint features yet\n"); | |
484 | break; | |
485 | ||
486 | /* CLASS REQUESTS (and errors) */ | |
487 | ||
488 | default: | |
489 | /* non-generic request */ | |
b13296c6 DB |
490 | switch (typeReq) { |
491 | case GetHubStatus: | |
492 | case GetPortStatus: | |
493 | len = 4; | |
494 | break; | |
495 | case GetHubDescriptor: | |
496 | len = sizeof (struct usb_hub_descriptor); | |
497 | break; | |
1da177e4 | 498 | } |
b13296c6 DB |
499 | status = hcd->driver->hub_control (hcd, |
500 | typeReq, wValue, wIndex, | |
501 | tbuf, wLength); | |
1da177e4 LT |
502 | break; |
503 | error: | |
504 | /* "protocol stall" on error */ | |
505 | status = -EPIPE; | |
506 | } | |
507 | ||
508 | if (status) { | |
509 | len = 0; | |
510 | if (status != -EPIPE) { | |
511 | dev_dbg (hcd->self.controller, | |
512 | "CTRL: TypeReq=0x%x val=0x%x " | |
513 | "idx=0x%x len=%d ==> %d\n", | |
514 | typeReq, wValue, wIndex, | |
b13296c6 | 515 | wLength, status); |
1da177e4 LT |
516 | } |
517 | } | |
518 | if (len) { | |
519 | if (urb->transfer_buffer_length < len) | |
520 | len = urb->transfer_buffer_length; | |
521 | urb->actual_length = len; | |
522 | // always USB_DIR_IN, toward host | |
523 | memcpy (ubuf, bufp, len); | |
524 | ||
525 | /* report whether RH hardware supports remote wakeup */ | |
526 | if (patch_wakeup && | |
527 | len > offsetof (struct usb_config_descriptor, | |
528 | bmAttributes)) | |
529 | ((struct usb_config_descriptor *)ubuf)->bmAttributes | |
530 | |= USB_CONFIG_ATT_WAKEUP; | |
531 | } | |
532 | ||
533 | /* any errors get returned through the urb completion */ | |
9439eb94 | 534 | spin_lock_irq(&hcd_root_hub_lock); |
e9df41c5 | 535 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
9439eb94 AS |
536 | |
537 | /* This peculiar use of spinlocks echoes what real HC drivers do. | |
538 | * Avoiding calls to local_irq_disable/enable makes the code | |
539 | * RT-friendly. | |
540 | */ | |
541 | spin_unlock(&hcd_root_hub_lock); | |
4a00027d | 542 | usb_hcd_giveback_urb(hcd, urb, status); |
9439eb94 AS |
543 | spin_lock(&hcd_root_hub_lock); |
544 | ||
545 | spin_unlock_irq(&hcd_root_hub_lock); | |
1da177e4 LT |
546 | return 0; |
547 | } | |
548 | ||
549 | /*-------------------------------------------------------------------------*/ | |
550 | ||
551 | /* | |
d5926ae7 AS |
552 | * Root Hub interrupt transfers are polled using a timer if the |
553 | * driver requests it; otherwise the driver is responsible for | |
554 | * calling usb_hcd_poll_rh_status() when an event occurs. | |
1da177e4 | 555 | * |
d5926ae7 AS |
556 | * Completions are called in_interrupt(), but they may or may not |
557 | * be in_irq(). | |
1da177e4 | 558 | */ |
d5926ae7 AS |
559 | void usb_hcd_poll_rh_status(struct usb_hcd *hcd) |
560 | { | |
561 | struct urb *urb; | |
562 | int length; | |
563 | unsigned long flags; | |
564 | char buffer[4]; /* Any root hubs with > 31 ports? */ | |
1da177e4 | 565 | |
1b42ae6d AS |
566 | if (unlikely(!hcd->rh_registered)) |
567 | return; | |
d5926ae7 AS |
568 | if (!hcd->uses_new_polling && !hcd->status_urb) |
569 | return; | |
1da177e4 | 570 | |
d5926ae7 AS |
571 | length = hcd->driver->hub_status_data(hcd, buffer); |
572 | if (length > 0) { | |
1da177e4 | 573 | |
d5926ae7 | 574 | /* try to complete the status urb */ |
9439eb94 | 575 | spin_lock_irqsave(&hcd_root_hub_lock, flags); |
d5926ae7 AS |
576 | urb = hcd->status_urb; |
577 | if (urb) { | |
e9df41c5 AS |
578 | hcd->poll_pending = 0; |
579 | hcd->status_urb = NULL; | |
e9df41c5 AS |
580 | urb->actual_length = length; |
581 | memcpy(urb->transfer_buffer, buffer, length); | |
9439eb94 | 582 | |
e9df41c5 | 583 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
9439eb94 | 584 | spin_unlock(&hcd_root_hub_lock); |
4a00027d | 585 | usb_hcd_giveback_urb(hcd, urb, 0); |
9439eb94 | 586 | spin_lock(&hcd_root_hub_lock); |
e9df41c5 | 587 | } else { |
d5926ae7 | 588 | length = 0; |
d5926ae7 | 589 | hcd->poll_pending = 1; |
e9df41c5 | 590 | } |
9439eb94 | 591 | spin_unlock_irqrestore(&hcd_root_hub_lock, flags); |
1da177e4 LT |
592 | } |
593 | ||
d5926ae7 | 594 | /* The USB 2.0 spec says 256 ms. This is close enough and won't |
01cd0819 AV |
595 | * exceed that limit if HZ is 100. The math is more clunky than |
596 | * maybe expected, this is to make sure that all timers for USB devices | |
597 | * fire at the same time to give the CPU a break inbetween */ | |
d5926ae7 AS |
598 | if (hcd->uses_new_polling ? hcd->poll_rh : |
599 | (length == 0 && hcd->status_urb != NULL)) | |
01cd0819 | 600 | mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4)); |
1da177e4 | 601 | } |
d5926ae7 | 602 | EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status); |
1da177e4 LT |
603 | |
604 | /* timer callback */ | |
d5926ae7 AS |
605 | static void rh_timer_func (unsigned long _hcd) |
606 | { | |
607 | usb_hcd_poll_rh_status((struct usb_hcd *) _hcd); | |
608 | } | |
609 | ||
610 | /*-------------------------------------------------------------------------*/ | |
1da177e4 | 611 | |
d5926ae7 | 612 | static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb) |
1da177e4 | 613 | { |
d5926ae7 | 614 | int retval; |
1da177e4 | 615 | unsigned long flags; |
d5926ae7 | 616 | int len = 1 + (urb->dev->maxchild / 8); |
1da177e4 | 617 | |
d5926ae7 | 618 | spin_lock_irqsave (&hcd_root_hub_lock, flags); |
e9df41c5 | 619 | if (hcd->status_urb || urb->transfer_buffer_length < len) { |
d5926ae7 AS |
620 | dev_dbg (hcd->self.controller, "not queuing rh status urb\n"); |
621 | retval = -EINVAL; | |
e9df41c5 AS |
622 | goto done; |
623 | } | |
1da177e4 | 624 | |
e9df41c5 AS |
625 | retval = usb_hcd_link_urb_to_ep(hcd, urb); |
626 | if (retval) | |
627 | goto done; | |
1da177e4 | 628 | |
e9df41c5 AS |
629 | hcd->status_urb = urb; |
630 | urb->hcpriv = hcd; /* indicate it's queued */ | |
631 | if (!hcd->uses_new_polling) | |
632 | mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4)); | |
633 | ||
634 | /* If a status change has already occurred, report it ASAP */ | |
635 | else if (hcd->poll_pending) | |
636 | mod_timer(&hcd->rh_timer, jiffies); | |
637 | retval = 0; | |
638 | done: | |
d5926ae7 AS |
639 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); |
640 | return retval; | |
1da177e4 LT |
641 | } |
642 | ||
1da177e4 LT |
643 | static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb) |
644 | { | |
5e60a161 | 645 | if (usb_endpoint_xfer_int(&urb->ep->desc)) |
d5926ae7 | 646 | return rh_queue_status (hcd, urb); |
5e60a161 | 647 | if (usb_endpoint_xfer_control(&urb->ep->desc)) |
1da177e4 | 648 | return rh_call_control (hcd, urb); |
d5926ae7 | 649 | return -EINVAL; |
1da177e4 LT |
650 | } |
651 | ||
652 | /*-------------------------------------------------------------------------*/ | |
653 | ||
455b25fb AS |
654 | /* Unlinks of root-hub control URBs are legal, but they don't do anything |
655 | * since these URBs always execute synchronously. | |
d5926ae7 | 656 | */ |
e9df41c5 | 657 | static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
1da177e4 | 658 | { |
455b25fb | 659 | unsigned long flags; |
e9df41c5 | 660 | int rc; |
1da177e4 | 661 | |
9439eb94 | 662 | spin_lock_irqsave(&hcd_root_hub_lock, flags); |
e9df41c5 AS |
663 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
664 | if (rc) | |
665 | goto done; | |
666 | ||
5e60a161 | 667 | if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */ |
455b25fb | 668 | ; /* Do nothing */ |
d5926ae7 AS |
669 | |
670 | } else { /* Status URB */ | |
671 | if (!hcd->uses_new_polling) | |
455b25fb | 672 | del_timer (&hcd->rh_timer); |
d5926ae7 AS |
673 | if (urb == hcd->status_urb) { |
674 | hcd->status_urb = NULL; | |
e9df41c5 | 675 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
1da177e4 | 676 | |
9439eb94 | 677 | spin_unlock(&hcd_root_hub_lock); |
4a00027d | 678 | usb_hcd_giveback_urb(hcd, urb, status); |
9439eb94 AS |
679 | spin_lock(&hcd_root_hub_lock); |
680 | } | |
681 | } | |
e9df41c5 | 682 | done: |
9439eb94 | 683 | spin_unlock_irqrestore(&hcd_root_hub_lock, flags); |
e9df41c5 | 684 | return rc; |
1da177e4 LT |
685 | } |
686 | ||
5234ce1b IPG |
687 | |
688 | ||
689 | /* | |
690 | * Show & store the current value of authorized_default | |
691 | */ | |
692 | static ssize_t usb_host_authorized_default_show(struct device *dev, | |
693 | struct device_attribute *attr, | |
694 | char *buf) | |
695 | { | |
696 | struct usb_device *rh_usb_dev = to_usb_device(dev); | |
697 | struct usb_bus *usb_bus = rh_usb_dev->bus; | |
698 | struct usb_hcd *usb_hcd; | |
699 | ||
700 | if (usb_bus == NULL) /* FIXME: not sure if this case is possible */ | |
701 | return -ENODEV; | |
702 | usb_hcd = bus_to_hcd(usb_bus); | |
703 | return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default); | |
704 | } | |
705 | ||
706 | static ssize_t usb_host_authorized_default_store(struct device *dev, | |
707 | struct device_attribute *attr, | |
708 | const char *buf, size_t size) | |
709 | { | |
710 | ssize_t result; | |
711 | unsigned val; | |
712 | struct usb_device *rh_usb_dev = to_usb_device(dev); | |
713 | struct usb_bus *usb_bus = rh_usb_dev->bus; | |
714 | struct usb_hcd *usb_hcd; | |
715 | ||
716 | if (usb_bus == NULL) /* FIXME: not sure if this case is possible */ | |
717 | return -ENODEV; | |
718 | usb_hcd = bus_to_hcd(usb_bus); | |
719 | result = sscanf(buf, "%u\n", &val); | |
720 | if (result == 1) { | |
721 | usb_hcd->authorized_default = val? 1 : 0; | |
722 | result = size; | |
723 | } | |
724 | else | |
725 | result = -EINVAL; | |
726 | return result; | |
727 | } | |
728 | ||
729 | static DEVICE_ATTR(authorized_default, 0644, | |
730 | usb_host_authorized_default_show, | |
731 | usb_host_authorized_default_store); | |
732 | ||
733 | ||
734 | /* Group all the USB bus attributes */ | |
735 | static struct attribute *usb_bus_attrs[] = { | |
736 | &dev_attr_authorized_default.attr, | |
737 | NULL, | |
738 | }; | |
739 | ||
740 | static struct attribute_group usb_bus_attr_group = { | |
741 | .name = NULL, /* we want them in the same directory */ | |
742 | .attrs = usb_bus_attrs, | |
743 | }; | |
744 | ||
745 | ||
746 | ||
1da177e4 LT |
747 | /*-------------------------------------------------------------------------*/ |
748 | ||
8561b10f | 749 | static struct class *usb_host_class; |
1da177e4 LT |
750 | |
751 | int usb_host_init(void) | |
752 | { | |
8561b10f | 753 | int retval = 0; |
754 | ||
755 | usb_host_class = class_create(THIS_MODULE, "usb_host"); | |
756 | if (IS_ERR(usb_host_class)) | |
757 | retval = PTR_ERR(usb_host_class); | |
758 | return retval; | |
1da177e4 LT |
759 | } |
760 | ||
761 | void usb_host_cleanup(void) | |
762 | { | |
8561b10f | 763 | class_destroy(usb_host_class); |
1da177e4 LT |
764 | } |
765 | ||
766 | /** | |
767 | * usb_bus_init - shared initialization code | |
768 | * @bus: the bus structure being initialized | |
769 | * | |
770 | * This code is used to initialize a usb_bus structure, memory for which is | |
771 | * separately managed. | |
772 | */ | |
773 | static void usb_bus_init (struct usb_bus *bus) | |
774 | { | |
775 | memset (&bus->devmap, 0, sizeof(struct usb_devmap)); | |
776 | ||
777 | bus->devnum_next = 1; | |
778 | ||
779 | bus->root_hub = NULL; | |
1da177e4 LT |
780 | bus->busnum = -1; |
781 | bus->bandwidth_allocated = 0; | |
782 | bus->bandwidth_int_reqs = 0; | |
783 | bus->bandwidth_isoc_reqs = 0; | |
784 | ||
785 | INIT_LIST_HEAD (&bus->bus_list); | |
1da177e4 LT |
786 | } |
787 | ||
1da177e4 LT |
788 | /*-------------------------------------------------------------------------*/ |
789 | ||
790 | /** | |
791 | * usb_register_bus - registers the USB host controller with the usb core | |
792 | * @bus: pointer to the bus to register | |
793 | * Context: !in_interrupt() | |
794 | * | |
795 | * Assigns a bus number, and links the controller into usbcore data | |
796 | * structures so that it can be seen by scanning the bus list. | |
797 | */ | |
798 | static int usb_register_bus(struct usb_bus *bus) | |
799 | { | |
eb579f58 | 800 | int result = -E2BIG; |
1da177e4 | 801 | int busnum; |
1da177e4 | 802 | |
4186ecf8 | 803 | mutex_lock(&usb_bus_list_lock); |
1da177e4 | 804 | busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1); |
eb579f58 | 805 | if (busnum >= USB_MAXBUS) { |
1da177e4 | 806 | printk (KERN_ERR "%s: too many buses\n", usbcore_name); |
eb579f58 | 807 | goto error_find_busnum; |
1da177e4 | 808 | } |
eb579f58 IPG |
809 | set_bit (busnum, busmap.busmap); |
810 | bus->busnum = busnum; | |
5a3201b2 TJ |
811 | |
812 | bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0), | |
813 | "usb_host%d", busnum); | |
814 | result = PTR_ERR(bus->dev); | |
815 | if (IS_ERR(bus->dev)) | |
eb579f58 | 816 | goto error_create_class_dev; |
5a3201b2 | 817 | dev_set_drvdata(bus->dev, bus); |
8561b10f | 818 | |
1da177e4 LT |
819 | /* Add it to the local list of buses */ |
820 | list_add (&bus->bus_list, &usb_bus_list); | |
4186ecf8 | 821 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 | 822 | |
3099e75a | 823 | usb_notify_add_bus(bus); |
1da177e4 | 824 | |
eb579f58 IPG |
825 | dev_info (bus->controller, "new USB bus registered, assigned bus " |
826 | "number %d\n", bus->busnum); | |
1da177e4 | 827 | return 0; |
eb579f58 IPG |
828 | |
829 | error_create_class_dev: | |
830 | clear_bit(busnum, busmap.busmap); | |
831 | error_find_busnum: | |
832 | mutex_unlock(&usb_bus_list_lock); | |
833 | return result; | |
1da177e4 LT |
834 | } |
835 | ||
836 | /** | |
837 | * usb_deregister_bus - deregisters the USB host controller | |
838 | * @bus: pointer to the bus to deregister | |
839 | * Context: !in_interrupt() | |
840 | * | |
841 | * Recycles the bus number, and unlinks the controller from usbcore data | |
842 | * structures so that it won't be seen by scanning the bus list. | |
843 | */ | |
844 | static void usb_deregister_bus (struct usb_bus *bus) | |
845 | { | |
846 | dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum); | |
847 | ||
848 | /* | |
849 | * NOTE: make sure that all the devices are removed by the | |
850 | * controller code, as well as having it call this when cleaning | |
851 | * itself up | |
852 | */ | |
4186ecf8 | 853 | mutex_lock(&usb_bus_list_lock); |
1da177e4 | 854 | list_del (&bus->bus_list); |
4186ecf8 | 855 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 | 856 | |
3099e75a | 857 | usb_notify_remove_bus(bus); |
1da177e4 LT |
858 | |
859 | clear_bit (bus->busnum, busmap.busmap); | |
860 | ||
5a3201b2 | 861 | device_unregister(bus->dev); |
1da177e4 LT |
862 | } |
863 | ||
864 | /** | |
8ec8d20b | 865 | * register_root_hub - called by usb_add_hcd() to register a root hub |
1da177e4 LT |
866 | * @hcd: host controller for this root hub |
867 | * | |
8ec8d20b | 868 | * This function registers the root hub with the USB subsystem. It sets up |
b1e8f0a6 DB |
869 | * the device properly in the device tree and then calls usb_new_device() |
870 | * to register the usb device. It also assigns the root hub's USB address | |
871 | * (always 1). | |
1da177e4 | 872 | */ |
b1e8f0a6 | 873 | static int register_root_hub(struct usb_hcd *hcd) |
1da177e4 LT |
874 | { |
875 | struct device *parent_dev = hcd->self.controller; | |
b1e8f0a6 | 876 | struct usb_device *usb_dev = hcd->self.root_hub; |
1da177e4 LT |
877 | const int devnum = 1; |
878 | int retval; | |
879 | ||
1da177e4 LT |
880 | usb_dev->devnum = devnum; |
881 | usb_dev->bus->devnum_next = devnum + 1; | |
882 | memset (&usb_dev->bus->devmap.devicemap, 0, | |
883 | sizeof usb_dev->bus->devmap.devicemap); | |
884 | set_bit (devnum, usb_dev->bus->devmap.devicemap); | |
885 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); | |
886 | ||
4186ecf8 | 887 | mutex_lock(&usb_bus_list_lock); |
1da177e4 LT |
888 | |
889 | usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
890 | retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE); | |
891 | if (retval != sizeof usb_dev->descriptor) { | |
4186ecf8 | 892 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
893 | dev_dbg (parent_dev, "can't read %s device descriptor %d\n", |
894 | usb_dev->dev.bus_id, retval); | |
895 | return (retval < 0) ? retval : -EMSGSIZE; | |
896 | } | |
897 | ||
1da177e4 | 898 | retval = usb_new_device (usb_dev); |
1da177e4 | 899 | if (retval) { |
1da177e4 LT |
900 | dev_err (parent_dev, "can't register root hub for %s, %d\n", |
901 | usb_dev->dev.bus_id, retval); | |
902 | } | |
4186ecf8 | 903 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
904 | |
905 | if (retval == 0) { | |
906 | spin_lock_irq (&hcd_root_hub_lock); | |
907 | hcd->rh_registered = 1; | |
908 | spin_unlock_irq (&hcd_root_hub_lock); | |
909 | ||
910 | /* Did the HC die before the root hub was registered? */ | |
911 | if (hcd->state == HC_STATE_HALT) | |
912 | usb_hc_died (hcd); /* This time clean up */ | |
913 | } | |
914 | ||
915 | return retval; | |
916 | } | |
1da177e4 | 917 | |
d5926ae7 AS |
918 | void usb_enable_root_hub_irq (struct usb_bus *bus) |
919 | { | |
920 | struct usb_hcd *hcd; | |
921 | ||
922 | hcd = container_of (bus, struct usb_hcd, self); | |
d19ac7da | 923 | if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT) |
d5926ae7 AS |
924 | hcd->driver->hub_irq_enable (hcd); |
925 | } | |
926 | ||
1da177e4 LT |
927 | |
928 | /*-------------------------------------------------------------------------*/ | |
929 | ||
930 | /** | |
931 | * usb_calc_bus_time - approximate periodic transaction time in nanoseconds | |
932 | * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH} | |
933 | * @is_input: true iff the transaction sends data to the host | |
934 | * @isoc: true for isochronous transactions, false for interrupt ones | |
935 | * @bytecount: how many bytes in the transaction. | |
936 | * | |
937 | * Returns approximate bus time in nanoseconds for a periodic transaction. | |
938 | * See USB 2.0 spec section 5.11.3; only periodic transfers need to be | |
939 | * scheduled in software, this function is only used for such scheduling. | |
940 | */ | |
941 | long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount) | |
942 | { | |
943 | unsigned long tmp; | |
944 | ||
945 | switch (speed) { | |
946 | case USB_SPEED_LOW: /* INTR only */ | |
947 | if (is_input) { | |
948 | tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L; | |
949 | return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp); | |
950 | } else { | |
951 | tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L; | |
952 | return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp); | |
953 | } | |
954 | case USB_SPEED_FULL: /* ISOC or INTR */ | |
955 | if (isoc) { | |
956 | tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L; | |
957 | return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp); | |
958 | } else { | |
959 | tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L; | |
960 | return (9107L + BW_HOST_DELAY + tmp); | |
961 | } | |
962 | case USB_SPEED_HIGH: /* ISOC or INTR */ | |
963 | // FIXME adjust for input vs output | |
964 | if (isoc) | |
498f78e6 | 965 | tmp = HS_NSECS_ISO (bytecount); |
1da177e4 | 966 | else |
498f78e6 | 967 | tmp = HS_NSECS (bytecount); |
1da177e4 LT |
968 | return tmp; |
969 | default: | |
970 | pr_debug ("%s: bogus device speed!\n", usbcore_name); | |
971 | return -1; | |
972 | } | |
973 | } | |
974 | EXPORT_SYMBOL (usb_calc_bus_time); | |
975 | ||
1da177e4 LT |
976 | |
977 | /*-------------------------------------------------------------------------*/ | |
978 | ||
979 | /* | |
980 | * Generic HC operations. | |
981 | */ | |
982 | ||
983 | /*-------------------------------------------------------------------------*/ | |
984 | ||
e9df41c5 AS |
985 | /** |
986 | * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue | |
987 | * @hcd: host controller to which @urb was submitted | |
988 | * @urb: URB being submitted | |
989 | * | |
990 | * Host controller drivers should call this routine in their enqueue() | |
991 | * method. The HCD's private spinlock must be held and interrupts must | |
992 | * be disabled. The actions carried out here are required for URB | |
993 | * submission, as well as for endpoint shutdown and for usb_kill_urb. | |
994 | * | |
995 | * Returns 0 for no error, otherwise a negative error code (in which case | |
996 | * the enqueue() method must fail). If no error occurs but enqueue() fails | |
997 | * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing | |
998 | * the private spinlock and returning. | |
999 | */ | |
1000 | int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb) | |
1da177e4 | 1001 | { |
9a9bf406 | 1002 | int rc = 0; |
1da177e4 | 1003 | |
e9df41c5 | 1004 | spin_lock(&hcd_urb_list_lock); |
1da177e4 | 1005 | |
9a9bf406 AS |
1006 | /* Check that the URB isn't being killed */ |
1007 | if (unlikely(urb->reject)) { | |
1008 | rc = -EPERM; | |
1009 | goto done; | |
9f6a93f7 | 1010 | } |
1da177e4 | 1011 | |
9a9bf406 AS |
1012 | if (unlikely(!urb->ep->enabled)) { |
1013 | rc = -ENOENT; | |
1014 | goto done; | |
1015 | } | |
1da177e4 | 1016 | |
6840d255 AS |
1017 | if (unlikely(!urb->dev->can_submit)) { |
1018 | rc = -EHOSTUNREACH; | |
1019 | goto done; | |
1020 | } | |
1021 | ||
1da177e4 | 1022 | /* |
9a9bf406 AS |
1023 | * Check the host controller's state and add the URB to the |
1024 | * endpoint's queue. | |
1da177e4 | 1025 | */ |
9a9bf406 | 1026 | switch (hcd->state) { |
1da177e4 LT |
1027 | case HC_STATE_RUNNING: |
1028 | case HC_STATE_RESUMING: | |
eb231054 | 1029 | urb->unlinked = 0; |
9a9bf406 | 1030 | list_add_tail(&urb->urb_list, &urb->ep->urb_list); |
1da177e4 LT |
1031 | break; |
1032 | default: | |
9a9bf406 AS |
1033 | rc = -ESHUTDOWN; |
1034 | goto done; | |
1da177e4 | 1035 | } |
9a9bf406 | 1036 | done: |
e9df41c5 | 1037 | spin_unlock(&hcd_urb_list_lock); |
9a9bf406 AS |
1038 | return rc; |
1039 | } | |
e9df41c5 | 1040 | EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep); |
9a9bf406 | 1041 | |
e9df41c5 AS |
1042 | /** |
1043 | * usb_hcd_check_unlink_urb - check whether an URB may be unlinked | |
1044 | * @hcd: host controller to which @urb was submitted | |
1045 | * @urb: URB being checked for unlinkability | |
1046 | * @status: error code to store in @urb if the unlink succeeds | |
1047 | * | |
1048 | * Host controller drivers should call this routine in their dequeue() | |
1049 | * method. The HCD's private spinlock must be held and interrupts must | |
1050 | * be disabled. The actions carried out here are required for making | |
1051 | * sure than an unlink is valid. | |
1052 | * | |
1053 | * Returns 0 for no error, otherwise a negative error code (in which case | |
1054 | * the dequeue() method must fail). The possible error codes are: | |
1055 | * | |
1056 | * -EIDRM: @urb was not submitted or has already completed. | |
1057 | * The completion function may not have been called yet. | |
1058 | * | |
1059 | * -EBUSY: @urb has already been unlinked. | |
1060 | */ | |
1061 | int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb, | |
9a9bf406 AS |
1062 | int status) |
1063 | { | |
9a9bf406 | 1064 | struct list_head *tmp; |
9a9bf406 AS |
1065 | |
1066 | /* insist the urb is still queued */ | |
1067 | list_for_each(tmp, &urb->ep->urb_list) { | |
1068 | if (tmp == &urb->urb_list) | |
1069 | break; | |
1070 | } | |
e9df41c5 AS |
1071 | if (tmp != &urb->urb_list) |
1072 | return -EIDRM; | |
1da177e4 | 1073 | |
9a9bf406 AS |
1074 | /* Any status except -EINPROGRESS means something already started to |
1075 | * unlink this URB from the hardware. So there's no more work to do. | |
1da177e4 | 1076 | */ |
eb231054 | 1077 | if (urb->unlinked) |
e9df41c5 | 1078 | return -EBUSY; |
eb231054 | 1079 | urb->unlinked = status; |
1da177e4 | 1080 | |
9a9bf406 AS |
1081 | /* IRQ setup can easily be broken so that USB controllers |
1082 | * never get completion IRQs ... maybe even the ones we need to | |
1083 | * finish unlinking the initial failed usb_set_address() | |
1084 | * or device descriptor fetch. | |
1085 | */ | |
1086 | if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags) && | |
1087 | !is_root_hub(urb->dev)) { | |
1088 | dev_warn(hcd->self.controller, "Unlink after no-IRQ? " | |
1089 | "Controller is probably using the wrong IRQ.\n"); | |
1090 | set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); | |
1091 | } | |
1092 | ||
e9df41c5 | 1093 | return 0; |
9a9bf406 | 1094 | } |
e9df41c5 | 1095 | EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb); |
9a9bf406 | 1096 | |
e9df41c5 AS |
1097 | /** |
1098 | * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue | |
1099 | * @hcd: host controller to which @urb was submitted | |
1100 | * @urb: URB being unlinked | |
1101 | * | |
1102 | * Host controller drivers should call this routine before calling | |
1103 | * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and | |
1104 | * interrupts must be disabled. The actions carried out here are required | |
1105 | * for URB completion. | |
1106 | */ | |
1107 | void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb) | |
9a9bf406 | 1108 | { |
9a9bf406 | 1109 | /* clear all state linking urb to this dev (and hcd) */ |
e9df41c5 | 1110 | spin_lock(&hcd_urb_list_lock); |
9a9bf406 | 1111 | list_del_init(&urb->urb_list); |
e9df41c5 | 1112 | spin_unlock(&hcd_urb_list_lock); |
9a9bf406 | 1113 | } |
e9df41c5 | 1114 | EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep); |
9a9bf406 | 1115 | |
b3476675 MD |
1116 | /* |
1117 | * Some usb host controllers can only perform dma using a small SRAM area. | |
1118 | * The usb core itself is however optimized for host controllers that can dma | |
1119 | * using regular system memory - like pci devices doing bus mastering. | |
1120 | * | |
1121 | * To support host controllers with limited dma capabilites we provide dma | |
1122 | * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag. | |
1123 | * For this to work properly the host controller code must first use the | |
1124 | * function dma_declare_coherent_memory() to point out which memory area | |
1125 | * that should be used for dma allocations. | |
1126 | * | |
1127 | * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for | |
1128 | * dma using dma_alloc_coherent() which in turn allocates from the memory | |
1129 | * area pointed out with dma_declare_coherent_memory(). | |
1130 | * | |
1131 | * So, to summarize... | |
1132 | * | |
1133 | * - We need "local" memory, canonical example being | |
1134 | * a small SRAM on a discrete controller being the | |
1135 | * only memory that the controller can read ... | |
1136 | * (a) "normal" kernel memory is no good, and | |
1137 | * (b) there's not enough to share | |
1138 | * | |
1139 | * - The only *portable* hook for such stuff in the | |
1140 | * DMA framework is dma_declare_coherent_memory() | |
1141 | * | |
1142 | * - So we use that, even though the primary requirement | |
1143 | * is that the memory be "local" (hence addressible | |
1144 | * by that device), not "coherent". | |
1145 | * | |
1146 | */ | |
1147 | ||
1148 | static int hcd_alloc_coherent(struct usb_bus *bus, | |
1149 | gfp_t mem_flags, dma_addr_t *dma_handle, | |
1150 | void **vaddr_handle, size_t size, | |
1151 | enum dma_data_direction dir) | |
1152 | { | |
1153 | unsigned char *vaddr; | |
1154 | ||
1155 | vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr), | |
1156 | mem_flags, dma_handle); | |
1157 | if (!vaddr) | |
1158 | return -ENOMEM; | |
1159 | ||
1160 | /* | |
1161 | * Store the virtual address of the buffer at the end | |
1162 | * of the allocated dma buffer. The size of the buffer | |
1163 | * may be uneven so use unaligned functions instead | |
1164 | * of just rounding up. It makes sense to optimize for | |
1165 | * memory footprint over access speed since the amount | |
1166 | * of memory available for dma may be limited. | |
1167 | */ | |
1168 | put_unaligned((unsigned long)*vaddr_handle, | |
1169 | (unsigned long *)(vaddr + size)); | |
1170 | ||
1171 | if (dir == DMA_TO_DEVICE) | |
1172 | memcpy(vaddr, *vaddr_handle, size); | |
1173 | ||
1174 | *vaddr_handle = vaddr; | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle, | |
1179 | void **vaddr_handle, size_t size, | |
1180 | enum dma_data_direction dir) | |
1181 | { | |
1182 | unsigned char *vaddr = *vaddr_handle; | |
1183 | ||
1184 | vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size)); | |
1185 | ||
1186 | if (dir == DMA_FROM_DEVICE) | |
1187 | memcpy(vaddr, *vaddr_handle, size); | |
1188 | ||
1189 | hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle); | |
1190 | ||
1191 | *vaddr_handle = vaddr; | |
1192 | *dma_handle = 0; | |
1193 | } | |
1194 | ||
1195 | static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, | |
1196 | gfp_t mem_flags) | |
9a9bf406 | 1197 | { |
b3476675 MD |
1198 | enum dma_data_direction dir; |
1199 | int ret = 0; | |
1200 | ||
9a9bf406 AS |
1201 | /* Map the URB's buffers for DMA access. |
1202 | * Lower level HCD code should use *_dma exclusively, | |
1da177e4 LT |
1203 | * unless it uses pio or talks to another transport. |
1204 | */ | |
b3476675 MD |
1205 | if (is_root_hub(urb->dev)) |
1206 | return 0; | |
1207 | ||
1208 | if (usb_endpoint_xfer_control(&urb->ep->desc) | |
1209 | && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) { | |
1210 | if (hcd->self.uses_dma) | |
1211 | urb->setup_dma = dma_map_single( | |
1da177e4 LT |
1212 | hcd->self.controller, |
1213 | urb->setup_packet, | |
b3476675 | 1214 | sizeof(struct usb_ctrlrequest), |
1da177e4 | 1215 | DMA_TO_DEVICE); |
b3476675 MD |
1216 | else if (hcd->driver->flags & HCD_LOCAL_MEM) |
1217 | ret = hcd_alloc_coherent( | |
1218 | urb->dev->bus, mem_flags, | |
1219 | &urb->setup_dma, | |
1220 | (void **)&urb->setup_packet, | |
1221 | sizeof(struct usb_ctrlrequest), | |
1222 | DMA_TO_DEVICE); | |
1223 | } | |
1224 | ||
1225 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1226 | if (ret == 0 && urb->transfer_buffer_length != 0 | |
1227 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { | |
1228 | if (hcd->self.uses_dma) | |
1da177e4 LT |
1229 | urb->transfer_dma = dma_map_single ( |
1230 | hcd->self.controller, | |
1231 | urb->transfer_buffer, | |
1232 | urb->transfer_buffer_length, | |
b3476675 MD |
1233 | dir); |
1234 | else if (hcd->driver->flags & HCD_LOCAL_MEM) { | |
1235 | ret = hcd_alloc_coherent( | |
1236 | urb->dev->bus, mem_flags, | |
1237 | &urb->transfer_dma, | |
1238 | &urb->transfer_buffer, | |
1239 | urb->transfer_buffer_length, | |
1240 | dir); | |
1241 | ||
1242 | if (ret && usb_endpoint_xfer_control(&urb->ep->desc) | |
1243 | && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) | |
1244 | hcd_free_coherent(urb->dev->bus, | |
1245 | &urb->setup_dma, | |
1246 | (void **)&urb->setup_packet, | |
1247 | sizeof(struct usb_ctrlrequest), | |
1248 | DMA_TO_DEVICE); | |
1249 | } | |
1da177e4 | 1250 | } |
b3476675 | 1251 | return ret; |
9a9bf406 | 1252 | } |
1da177e4 | 1253 | |
9a9bf406 AS |
1254 | static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) |
1255 | { | |
b3476675 MD |
1256 | enum dma_data_direction dir; |
1257 | ||
1258 | if (is_root_hub(urb->dev)) | |
1259 | return; | |
1260 | ||
1261 | if (usb_endpoint_xfer_control(&urb->ep->desc) | |
1262 | && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) { | |
1263 | if (hcd->self.uses_dma) | |
9a9bf406 AS |
1264 | dma_unmap_single(hcd->self.controller, urb->setup_dma, |
1265 | sizeof(struct usb_ctrlrequest), | |
1266 | DMA_TO_DEVICE); | |
b3476675 MD |
1267 | else if (hcd->driver->flags & HCD_LOCAL_MEM) |
1268 | hcd_free_coherent(urb->dev->bus, &urb->setup_dma, | |
1269 | (void **)&urb->setup_packet, | |
1270 | sizeof(struct usb_ctrlrequest), | |
1271 | DMA_TO_DEVICE); | |
1272 | } | |
1273 | ||
1274 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1275 | if (urb->transfer_buffer_length != 0 | |
1276 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { | |
1277 | if (hcd->self.uses_dma) | |
9a9bf406 AS |
1278 | dma_unmap_single(hcd->self.controller, |
1279 | urb->transfer_dma, | |
1280 | urb->transfer_buffer_length, | |
b3476675 MD |
1281 | dir); |
1282 | else if (hcd->driver->flags & HCD_LOCAL_MEM) | |
1283 | hcd_free_coherent(urb->dev->bus, &urb->transfer_dma, | |
1284 | &urb->transfer_buffer, | |
1285 | urb->transfer_buffer_length, | |
1286 | dir); | |
9a9bf406 AS |
1287 | } |
1288 | } | |
1289 | ||
1290 | /*-------------------------------------------------------------------------*/ | |
1291 | ||
1292 | /* may be called in any context with a valid urb->dev usecount | |
1293 | * caller surrenders "ownership" of urb | |
1294 | * expects usb_submit_urb() to have sanity checked and conditioned all | |
1295 | * inputs in the urb | |
1296 | */ | |
1297 | int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags) | |
1298 | { | |
1299 | int status; | |
1300 | struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus); | |
1301 | ||
1302 | /* increment urb's reference count as part of giving it to the HCD | |
1303 | * (which will control it). HCD guarantees that it either returns | |
1304 | * an error or calls giveback(), but not both. | |
1305 | */ | |
1306 | usb_get_urb(urb); | |
1307 | atomic_inc(&urb->use_count); | |
4d59d8a1 | 1308 | atomic_inc(&urb->dev->urbnum); |
9a9bf406 AS |
1309 | usbmon_urb_submit(&hcd->self, urb); |
1310 | ||
1311 | /* NOTE requirements on root-hub callers (usbfs and the hub | |
1312 | * driver, for now): URBs' urb->transfer_buffer must be | |
1313 | * valid and usb_buffer_{sync,unmap}() not be needed, since | |
1314 | * they could clobber root hub response data. Also, control | |
1315 | * URBs must be submitted in process context with interrupts | |
1316 | * enabled. | |
1317 | */ | |
b3476675 MD |
1318 | status = map_urb_for_dma(hcd, urb, mem_flags); |
1319 | if (unlikely(status)) { | |
1320 | usbmon_urb_submit_error(&hcd->self, urb, status); | |
1321 | goto error; | |
1322 | } | |
1323 | ||
e9df41c5 AS |
1324 | if (is_root_hub(urb->dev)) |
1325 | status = rh_urb_enqueue(hcd, urb); | |
1326 | else | |
1327 | status = hcd->driver->urb_enqueue(hcd, urb, mem_flags); | |
9a9bf406 AS |
1328 | |
1329 | if (unlikely(status)) { | |
1da177e4 | 1330 | usbmon_urb_submit_error(&hcd->self, urb, status); |
9a9bf406 | 1331 | unmap_urb_for_dma(hcd, urb); |
b3476675 | 1332 | error: |
b0d9efba | 1333 | urb->hcpriv = NULL; |
9a9bf406 AS |
1334 | INIT_LIST_HEAD(&urb->urb_list); |
1335 | atomic_dec(&urb->use_count); | |
4d59d8a1 | 1336 | atomic_dec(&urb->dev->urbnum); |
9a9bf406 AS |
1337 | if (urb->reject) |
1338 | wake_up(&usb_kill_urb_queue); | |
1339 | usb_put_urb(urb); | |
1da177e4 LT |
1340 | } |
1341 | return status; | |
1342 | } | |
1343 | ||
1344 | /*-------------------------------------------------------------------------*/ | |
1345 | ||
1da177e4 LT |
1346 | /* this makes the hcd giveback() the urb more quickly, by kicking it |
1347 | * off hardware queues (which may take a while) and returning it as | |
1348 | * soon as practical. we've already set up the urb's return status, | |
1349 | * but we can't know if the callback completed already. | |
1350 | */ | |
e9df41c5 | 1351 | static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status) |
1da177e4 LT |
1352 | { |
1353 | int value; | |
1354 | ||
809a58b8 | 1355 | if (is_root_hub(urb->dev)) |
e9df41c5 | 1356 | value = usb_rh_urb_dequeue(hcd, urb, status); |
1da177e4 LT |
1357 | else { |
1358 | ||
1359 | /* The only reason an HCD might fail this call is if | |
1360 | * it has not yet fully queued the urb to begin with. | |
1361 | * Such failures should be harmless. */ | |
e9df41c5 | 1362 | value = hcd->driver->urb_dequeue(hcd, urb, status); |
1da177e4 | 1363 | } |
1da177e4 LT |
1364 | return value; |
1365 | } | |
1366 | ||
1367 | /* | |
1368 | * called in any context | |
1369 | * | |
1370 | * caller guarantees urb won't be recycled till both unlink() | |
1371 | * and the urb's completion function return | |
1372 | */ | |
a6d2bb9f | 1373 | int usb_hcd_unlink_urb (struct urb *urb, int status) |
1da177e4 | 1374 | { |
9a9bf406 AS |
1375 | struct usb_hcd *hcd; |
1376 | int retval; | |
1da177e4 | 1377 | |
17200583 | 1378 | hcd = bus_to_hcd(urb->dev->bus); |
e9df41c5 | 1379 | retval = unlink1(hcd, urb, status); |
1da177e4 | 1380 | |
1da177e4 LT |
1381 | if (retval == 0) |
1382 | retval = -EINPROGRESS; | |
e9df41c5 | 1383 | else if (retval != -EIDRM && retval != -EBUSY) |
9a9bf406 AS |
1384 | dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n", |
1385 | urb, retval); | |
1da177e4 LT |
1386 | return retval; |
1387 | } | |
1388 | ||
1389 | /*-------------------------------------------------------------------------*/ | |
1390 | ||
32aca560 AS |
1391 | /** |
1392 | * usb_hcd_giveback_urb - return URB from HCD to device driver | |
1393 | * @hcd: host controller returning the URB | |
1394 | * @urb: urb being returned to the USB device driver. | |
4a00027d | 1395 | * @status: completion status code for the URB. |
32aca560 AS |
1396 | * Context: in_interrupt() |
1397 | * | |
1398 | * This hands the URB from HCD to its USB device driver, using its | |
1399 | * completion function. The HCD has freed all per-urb resources | |
1400 | * (and is done using urb->hcpriv). It also released all HCD locks; | |
1401 | * the device driver won't cause problems if it frees, modifies, | |
1402 | * or resubmits this URB. | |
eb231054 | 1403 | * |
4a00027d | 1404 | * If @urb was unlinked, the value of @status will be overridden by |
eb231054 AS |
1405 | * @urb->unlinked. Erroneous short transfers are detected in case |
1406 | * the HCD hasn't checked for them. | |
32aca560 | 1407 | */ |
4a00027d | 1408 | void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status) |
32aca560 | 1409 | { |
b0d9efba | 1410 | urb->hcpriv = NULL; |
eb231054 | 1411 | if (unlikely(urb->unlinked)) |
4a00027d | 1412 | status = urb->unlinked; |
eb231054 | 1413 | else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) && |
b0d9efba | 1414 | urb->actual_length < urb->transfer_buffer_length && |
4a00027d AS |
1415 | !status)) |
1416 | status = -EREMOTEIO; | |
32aca560 | 1417 | |
1f5a3d0f | 1418 | unmap_urb_for_dma(hcd, urb); |
4a00027d | 1419 | usbmon_urb_complete(&hcd->self, urb, status); |
1f5a3d0f AS |
1420 | usb_unanchor_urb(urb); |
1421 | ||
32aca560 | 1422 | /* pass ownership to the completion handler */ |
4a00027d | 1423 | urb->status = status; |
32aca560 AS |
1424 | urb->complete (urb); |
1425 | atomic_dec (&urb->use_count); | |
1426 | if (unlikely (urb->reject)) | |
1427 | wake_up (&usb_kill_urb_queue); | |
1428 | usb_put_urb (urb); | |
1429 | } | |
1430 | EXPORT_SYMBOL (usb_hcd_giveback_urb); | |
1431 | ||
1432 | /*-------------------------------------------------------------------------*/ | |
1433 | ||
95cf82f9 AS |
1434 | /* Cancel all URBs pending on this endpoint and wait for the endpoint's |
1435 | * queue to drain completely. The caller must first insure that no more | |
1436 | * URBs can be submitted for this endpoint. | |
1da177e4 | 1437 | */ |
95cf82f9 | 1438 | void usb_hcd_flush_endpoint(struct usb_device *udev, |
a6d2bb9f | 1439 | struct usb_host_endpoint *ep) |
1da177e4 LT |
1440 | { |
1441 | struct usb_hcd *hcd; | |
1442 | struct urb *urb; | |
1443 | ||
95cf82f9 AS |
1444 | if (!ep) |
1445 | return; | |
9a9bf406 | 1446 | might_sleep(); |
17200583 | 1447 | hcd = bus_to_hcd(udev->bus); |
1da177e4 | 1448 | |
95cf82f9 | 1449 | /* No more submits can occur */ |
9a9bf406 | 1450 | spin_lock_irq(&hcd_urb_list_lock); |
ddc1fd6a | 1451 | rescan: |
1da177e4 | 1452 | list_for_each_entry (urb, &ep->urb_list, urb_list) { |
5e60a161 | 1453 | int is_in; |
1da177e4 | 1454 | |
eb231054 | 1455 | if (urb->unlinked) |
1da177e4 LT |
1456 | continue; |
1457 | usb_get_urb (urb); | |
5e60a161 | 1458 | is_in = usb_urb_dir_in(urb); |
809a58b8 | 1459 | spin_unlock(&hcd_urb_list_lock); |
1da177e4 | 1460 | |
e9df41c5 AS |
1461 | /* kick hcd */ |
1462 | unlink1(hcd, urb, -ESHUTDOWN); | |
1463 | dev_dbg (hcd->self.controller, | |
1464 | "shutdown urb %p ep%d%s%s\n", | |
1465 | urb, usb_endpoint_num(&ep->desc), | |
1466 | is_in ? "in" : "out", | |
1467 | ({ char *s; | |
1468 | ||
1469 | switch (usb_endpoint_type(&ep->desc)) { | |
1470 | case USB_ENDPOINT_XFER_CONTROL: | |
1471 | s = ""; break; | |
1472 | case USB_ENDPOINT_XFER_BULK: | |
1473 | s = "-bulk"; break; | |
1474 | case USB_ENDPOINT_XFER_INT: | |
1475 | s = "-intr"; break; | |
1476 | default: | |
1477 | s = "-iso"; break; | |
1478 | }; | |
1479 | s; | |
1480 | })); | |
1da177e4 LT |
1481 | usb_put_urb (urb); |
1482 | ||
1483 | /* list contents may have changed */ | |
ddc1fd6a | 1484 | spin_lock(&hcd_urb_list_lock); |
1da177e4 LT |
1485 | goto rescan; |
1486 | } | |
9a9bf406 | 1487 | spin_unlock_irq(&hcd_urb_list_lock); |
1da177e4 | 1488 | |
95cf82f9 | 1489 | /* Wait until the endpoint queue is completely empty */ |
455b25fb | 1490 | while (!list_empty (&ep->urb_list)) { |
809a58b8 | 1491 | spin_lock_irq(&hcd_urb_list_lock); |
455b25fb AS |
1492 | |
1493 | /* The list may have changed while we acquired the spinlock */ | |
1494 | urb = NULL; | |
1495 | if (!list_empty (&ep->urb_list)) { | |
1496 | urb = list_entry (ep->urb_list.prev, struct urb, | |
1497 | urb_list); | |
1498 | usb_get_urb (urb); | |
1499 | } | |
809a58b8 | 1500 | spin_unlock_irq(&hcd_urb_list_lock); |
455b25fb AS |
1501 | |
1502 | if (urb) { | |
1503 | usb_kill_urb (urb); | |
1504 | usb_put_urb (urb); | |
1505 | } | |
1506 | } | |
1da177e4 LT |
1507 | } |
1508 | ||
95cf82f9 AS |
1509 | /* Disables the endpoint: synchronizes with the hcd to make sure all |
1510 | * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must | |
1511 | * have been called previously. Use for set_configuration, set_interface, | |
1512 | * driver removal, physical disconnect. | |
1513 | * | |
1514 | * example: a qh stored in ep->hcpriv, holding state related to endpoint | |
1515 | * type, maxpacket size, toggle, halt status, and scheduling. | |
1516 | */ | |
1517 | void usb_hcd_disable_endpoint(struct usb_device *udev, | |
1518 | struct usb_host_endpoint *ep) | |
1519 | { | |
1520 | struct usb_hcd *hcd; | |
1521 | ||
1522 | might_sleep(); | |
1523 | hcd = bus_to_hcd(udev->bus); | |
1524 | if (hcd->driver->endpoint_disable) | |
1525 | hcd->driver->endpoint_disable(hcd, ep); | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | /*-------------------------------------------------------------------------*/ |
1529 | ||
32aca560 AS |
1530 | /* called in any context */ |
1531 | int usb_hcd_get_frame_number (struct usb_device *udev) | |
1532 | { | |
1533 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1534 | ||
1535 | if (!HC_IS_RUNNING (hcd->state)) | |
1536 | return -ESHUTDOWN; | |
1537 | return hcd->driver->get_frame_number (hcd); | |
1538 | } | |
1539 | ||
1540 | /*-------------------------------------------------------------------------*/ | |
1541 | ||
9293677a | 1542 | #ifdef CONFIG_PM |
1da177e4 | 1543 | |
686314cf | 1544 | int hcd_bus_suspend(struct usb_device *rhdev) |
1da177e4 | 1545 | { |
686314cf AS |
1546 | struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self); |
1547 | int status; | |
1548 | int old_state = hcd->state; | |
1da177e4 | 1549 | |
686314cf AS |
1550 | dev_dbg(&rhdev->dev, "bus %s%s\n", |
1551 | rhdev->auto_pm ? "auto-" : "", "suspend"); | |
1552 | if (!hcd->driver->bus_suspend) { | |
1553 | status = -ENOENT; | |
1554 | } else { | |
1555 | hcd->state = HC_STATE_QUIESCING; | |
1556 | status = hcd->driver->bus_suspend(hcd); | |
1557 | } | |
1558 | if (status == 0) { | |
1559 | usb_set_device_state(rhdev, USB_STATE_SUSPENDED); | |
9293677a | 1560 | hcd->state = HC_STATE_SUSPENDED; |
686314cf AS |
1561 | } else { |
1562 | hcd->state = old_state; | |
1563 | dev_dbg(&rhdev->dev, "bus %s fail, err %d\n", | |
9293677a | 1564 | "suspend", status); |
686314cf | 1565 | } |
9293677a | 1566 | return status; |
1da177e4 LT |
1567 | } |
1568 | ||
686314cf | 1569 | int hcd_bus_resume(struct usb_device *rhdev) |
1da177e4 | 1570 | { |
686314cf AS |
1571 | struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self); |
1572 | int status; | |
cfa59dab | 1573 | int old_state = hcd->state; |
1da177e4 | 1574 | |
686314cf AS |
1575 | dev_dbg(&rhdev->dev, "usb %s%s\n", |
1576 | rhdev->auto_pm ? "auto-" : "", "resume"); | |
0c0382e3 | 1577 | if (!hcd->driver->bus_resume) |
9293677a | 1578 | return -ENOENT; |
979d5199 DB |
1579 | if (hcd->state == HC_STATE_RUNNING) |
1580 | return 0; | |
686314cf | 1581 | |
9293677a | 1582 | hcd->state = HC_STATE_RESUMING; |
686314cf AS |
1583 | status = hcd->driver->bus_resume(hcd); |
1584 | if (status == 0) { | |
1585 | /* TRSMRCY = 10 msec */ | |
1586 | msleep(10); | |
1587 | usb_set_device_state(rhdev, rhdev->actconfig | |
1588 | ? USB_STATE_CONFIGURED | |
1589 | : USB_STATE_ADDRESS); | |
9293677a | 1590 | hcd->state = HC_STATE_RUNNING; |
686314cf | 1591 | } else { |
cfa59dab | 1592 | hcd->state = old_state; |
686314cf | 1593 | dev_dbg(&rhdev->dev, "bus %s fail, err %d\n", |
9293677a | 1594 | "resume", status); |
cfa59dab AS |
1595 | if (status != -ESHUTDOWN) |
1596 | usb_hc_died(hcd); | |
9293677a DB |
1597 | } |
1598 | return status; | |
1da177e4 LT |
1599 | } |
1600 | ||
6b157c9b AS |
1601 | /* Workqueue routine for root-hub remote wakeup */ |
1602 | static void hcd_resume_work(struct work_struct *work) | |
1603 | { | |
1604 | struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work); | |
1605 | struct usb_device *udev = hcd->self.root_hub; | |
1606 | ||
1607 | usb_lock_device(udev); | |
1941044a | 1608 | usb_mark_last_busy(udev); |
6b157c9b AS |
1609 | usb_external_resume_device(udev); |
1610 | usb_unlock_device(udev); | |
1611 | } | |
1612 | ||
1da177e4 LT |
1613 | /** |
1614 | * usb_hcd_resume_root_hub - called by HCD to resume its root hub | |
1615 | * @hcd: host controller for this root hub | |
1616 | * | |
1617 | * The USB host controller calls this function when its root hub is | |
1618 | * suspended (with the remote wakeup feature enabled) and a remote | |
6b157c9b AS |
1619 | * wakeup request is received. The routine submits a workqueue request |
1620 | * to resume the root hub (that is, manage its downstream ports again). | |
1da177e4 LT |
1621 | */ |
1622 | void usb_hcd_resume_root_hub (struct usb_hcd *hcd) | |
1623 | { | |
1624 | unsigned long flags; | |
1625 | ||
1626 | spin_lock_irqsave (&hcd_root_hub_lock, flags); | |
1627 | if (hcd->rh_registered) | |
6b157c9b | 1628 | queue_work(ksuspend_usb_wq, &hcd->wakeup_work); |
1da177e4 LT |
1629 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); |
1630 | } | |
9293677a | 1631 | EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub); |
1da177e4 | 1632 | |
1da177e4 | 1633 | #endif |
1da177e4 LT |
1634 | |
1635 | /*-------------------------------------------------------------------------*/ | |
1636 | ||
1637 | #ifdef CONFIG_USB_OTG | |
1638 | ||
1639 | /** | |
1640 | * usb_bus_start_enum - start immediate enumeration (for OTG) | |
1641 | * @bus: the bus (must use hcd framework) | |
1642 | * @port_num: 1-based number of port; usually bus->otg_port | |
1643 | * Context: in_interrupt() | |
1644 | * | |
1645 | * Starts enumeration, with an immediate reset followed later by | |
1646 | * khubd identifying and possibly configuring the device. | |
1647 | * This is needed by OTG controller drivers, where it helps meet | |
1648 | * HNP protocol timing requirements for starting a port reset. | |
1649 | */ | |
1650 | int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num) | |
1651 | { | |
1652 | struct usb_hcd *hcd; | |
1653 | int status = -EOPNOTSUPP; | |
1654 | ||
1655 | /* NOTE: since HNP can't start by grabbing the bus's address0_sem, | |
1656 | * boards with root hubs hooked up to internal devices (instead of | |
1657 | * just the OTG port) may need more attention to resetting... | |
1658 | */ | |
1659 | hcd = container_of (bus, struct usb_hcd, self); | |
1660 | if (port_num && hcd->driver->start_port_reset) | |
1661 | status = hcd->driver->start_port_reset(hcd, port_num); | |
1662 | ||
1663 | /* run khubd shortly after (first) root port reset finishes; | |
1664 | * it may issue others, until at least 50 msecs have passed. | |
1665 | */ | |
1666 | if (status == 0) | |
1667 | mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10)); | |
1668 | return status; | |
1669 | } | |
1670 | EXPORT_SYMBOL (usb_bus_start_enum); | |
1671 | ||
1672 | #endif | |
1673 | ||
1674 | /*-------------------------------------------------------------------------*/ | |
1675 | ||
1da177e4 LT |
1676 | /** |
1677 | * usb_hcd_irq - hook IRQs to HCD framework (bus glue) | |
1678 | * @irq: the IRQ being raised | |
1679 | * @__hcd: pointer to the HCD whose IRQ is being signaled | |
1680 | * @r: saved hardware registers | |
1681 | * | |
1682 | * If the controller isn't HALTed, calls the driver's irq handler. | |
1683 | * Checks whether the controller is now dead. | |
1684 | */ | |
7d12e780 | 1685 | irqreturn_t usb_hcd_irq (int irq, void *__hcd) |
1da177e4 LT |
1686 | { |
1687 | struct usb_hcd *hcd = __hcd; | |
1688 | int start = hcd->state; | |
1689 | ||
8de98402 BH |
1690 | if (unlikely(start == HC_STATE_HALT || |
1691 | !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) | |
1da177e4 | 1692 | return IRQ_NONE; |
7d12e780 | 1693 | if (hcd->driver->irq (hcd) == IRQ_NONE) |
1da177e4 LT |
1694 | return IRQ_NONE; |
1695 | ||
8de98402 BH |
1696 | set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); |
1697 | ||
1698 | if (unlikely(hcd->state == HC_STATE_HALT)) | |
1da177e4 LT |
1699 | usb_hc_died (hcd); |
1700 | return IRQ_HANDLED; | |
1701 | } | |
1702 | ||
1703 | /*-------------------------------------------------------------------------*/ | |
1704 | ||
1705 | /** | |
1706 | * usb_hc_died - report abnormal shutdown of a host controller (bus glue) | |
1707 | * @hcd: pointer to the HCD representing the controller | |
1708 | * | |
1709 | * This is called by bus glue to report a USB host controller that died | |
1710 | * while operations may still have been pending. It's called automatically | |
1711 | * by the PCI glue, so only glue for non-PCI busses should need to call it. | |
1712 | */ | |
1713 | void usb_hc_died (struct usb_hcd *hcd) | |
1714 | { | |
1715 | unsigned long flags; | |
1716 | ||
1717 | dev_err (hcd->self.controller, "HC died; cleaning up\n"); | |
1718 | ||
1719 | spin_lock_irqsave (&hcd_root_hub_lock, flags); | |
1720 | if (hcd->rh_registered) { | |
d5926ae7 | 1721 | hcd->poll_rh = 0; |
1da177e4 LT |
1722 | |
1723 | /* make khubd clean up old urbs and devices */ | |
1724 | usb_set_device_state (hcd->self.root_hub, | |
1725 | USB_STATE_NOTATTACHED); | |
1726 | usb_kick_khubd (hcd->self.root_hub); | |
1727 | } | |
1728 | spin_unlock_irqrestore (&hcd_root_hub_lock, flags); | |
1729 | } | |
1730 | EXPORT_SYMBOL_GPL (usb_hc_died); | |
1731 | ||
1732 | /*-------------------------------------------------------------------------*/ | |
1733 | ||
1da177e4 LT |
1734 | /** |
1735 | * usb_create_hcd - create and initialize an HCD structure | |
1736 | * @driver: HC driver that will use this hcd | |
1737 | * @dev: device for this HC, stored in hcd->self.controller | |
1738 | * @bus_name: value to store in hcd->self.bus_name | |
1739 | * Context: !in_interrupt() | |
1740 | * | |
1741 | * Allocate a struct usb_hcd, with extra space at the end for the | |
1742 | * HC driver's private data. Initialize the generic members of the | |
1743 | * hcd structure. | |
1744 | * | |
1745 | * If memory is unavailable, returns NULL. | |
1746 | */ | |
1747 | struct usb_hcd *usb_create_hcd (const struct hc_driver *driver, | |
1748 | struct device *dev, char *bus_name) | |
1749 | { | |
1750 | struct usb_hcd *hcd; | |
1751 | ||
7b842b6e | 1752 | hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL); |
1da177e4 LT |
1753 | if (!hcd) { |
1754 | dev_dbg (dev, "hcd alloc failed\n"); | |
1755 | return NULL; | |
1756 | } | |
1757 | dev_set_drvdata(dev, hcd); | |
17200583 | 1758 | kref_init(&hcd->kref); |
1da177e4 LT |
1759 | |
1760 | usb_bus_init(&hcd->self); | |
1da177e4 LT |
1761 | hcd->self.controller = dev; |
1762 | hcd->self.bus_name = bus_name; | |
dd990f16 | 1763 | hcd->self.uses_dma = (dev->dma_mask != NULL); |
1da177e4 LT |
1764 | |
1765 | init_timer(&hcd->rh_timer); | |
d5926ae7 AS |
1766 | hcd->rh_timer.function = rh_timer_func; |
1767 | hcd->rh_timer.data = (unsigned long) hcd; | |
6b157c9b AS |
1768 | #ifdef CONFIG_PM |
1769 | INIT_WORK(&hcd->wakeup_work, hcd_resume_work); | |
1770 | #endif | |
1da177e4 LT |
1771 | |
1772 | hcd->driver = driver; | |
1773 | hcd->product_desc = (driver->product_desc) ? driver->product_desc : | |
1774 | "USB Host Controller"; | |
1da177e4 LT |
1775 | return hcd; |
1776 | } | |
1777 | EXPORT_SYMBOL (usb_create_hcd); | |
1778 | ||
17200583 AS |
1779 | static void hcd_release (struct kref *kref) |
1780 | { | |
1781 | struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref); | |
1782 | ||
1783 | kfree(hcd); | |
1784 | } | |
1785 | ||
1786 | struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd) | |
1787 | { | |
1788 | if (hcd) | |
1789 | kref_get (&hcd->kref); | |
1790 | return hcd; | |
1791 | } | |
1792 | EXPORT_SYMBOL (usb_get_hcd); | |
1793 | ||
1da177e4 LT |
1794 | void usb_put_hcd (struct usb_hcd *hcd) |
1795 | { | |
17200583 AS |
1796 | if (hcd) |
1797 | kref_put (&hcd->kref, hcd_release); | |
1da177e4 LT |
1798 | } |
1799 | EXPORT_SYMBOL (usb_put_hcd); | |
1800 | ||
1801 | /** | |
1802 | * usb_add_hcd - finish generic HCD structure initialization and register | |
1803 | * @hcd: the usb_hcd structure to initialize | |
1804 | * @irqnum: Interrupt line to allocate | |
1805 | * @irqflags: Interrupt type flags | |
1806 | * | |
1807 | * Finish the remaining parts of generic HCD initialization: allocate the | |
1808 | * buffers of consistent memory, register the bus, request the IRQ line, | |
1809 | * and call the driver's reset() and start() routines. | |
1810 | */ | |
1811 | int usb_add_hcd(struct usb_hcd *hcd, | |
1812 | unsigned int irqnum, unsigned long irqflags) | |
1813 | { | |
8ec8d20b AS |
1814 | int retval; |
1815 | struct usb_device *rhdev; | |
1da177e4 LT |
1816 | |
1817 | dev_info(hcd->self.controller, "%s\n", hcd->product_desc); | |
1818 | ||
5234ce1b | 1819 | hcd->authorized_default = hcd->wireless? 0 : 1; |
8de98402 BH |
1820 | set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
1821 | ||
b1e8f0a6 DB |
1822 | /* HC is in reset state, but accessible. Now do the one-time init, |
1823 | * bottom up so that hcds can customize the root hubs before khubd | |
1824 | * starts talking to them. (Note, bus id is assigned early too.) | |
1825 | */ | |
1da177e4 LT |
1826 | if ((retval = hcd_buffer_create(hcd)) != 0) { |
1827 | dev_dbg(hcd->self.controller, "pool alloc failed\n"); | |
1828 | return retval; | |
1829 | } | |
1830 | ||
1831 | if ((retval = usb_register_bus(&hcd->self)) < 0) | |
8ec8d20b | 1832 | goto err_register_bus; |
1da177e4 | 1833 | |
b1e8f0a6 DB |
1834 | if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) { |
1835 | dev_err(hcd->self.controller, "unable to allocate root hub\n"); | |
1836 | retval = -ENOMEM; | |
1837 | goto err_allocate_root_hub; | |
1838 | } | |
1839 | rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH : | |
1840 | USB_SPEED_FULL; | |
1841 | hcd->self.root_hub = rhdev; | |
1842 | ||
db4cefaa DB |
1843 | /* wakeup flag init defaults to "everything works" for root hubs, |
1844 | * but drivers can override it in reset() if needed, along with | |
1845 | * recording the overall controller's system wakeup capability. | |
1846 | */ | |
1847 | device_init_wakeup(&rhdev->dev, 1); | |
1848 | ||
b1e8f0a6 DB |
1849 | /* "reset" is misnamed; its role is now one-time init. the controller |
1850 | * should already have been reset (and boot firmware kicked off etc). | |
1851 | */ | |
1852 | if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) { | |
1853 | dev_err(hcd->self.controller, "can't setup\n"); | |
1854 | goto err_hcd_driver_setup; | |
1855 | } | |
1856 | ||
fb669cc0 DB |
1857 | /* NOTE: root hub and controller capabilities may not be the same */ |
1858 | if (device_can_wakeup(hcd->self.controller) | |
1859 | && device_can_wakeup(&hcd->self.root_hub->dev)) | |
b1e8f0a6 | 1860 | dev_dbg(hcd->self.controller, "supports USB remote wakeup\n"); |
b1e8f0a6 DB |
1861 | |
1862 | /* enable irqs just before we start the controller */ | |
1da177e4 | 1863 | if (hcd->driver->irq) { |
1da177e4 LT |
1864 | snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d", |
1865 | hcd->driver->description, hcd->self.busnum); | |
1866 | if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags, | |
1867 | hcd->irq_descr, hcd)) != 0) { | |
1868 | dev_err(hcd->self.controller, | |
c6387a48 | 1869 | "request interrupt %d failed\n", irqnum); |
8ec8d20b | 1870 | goto err_request_irq; |
1da177e4 LT |
1871 | } |
1872 | hcd->irq = irqnum; | |
c6387a48 | 1873 | dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum, |
1da177e4 LT |
1874 | (hcd->driver->flags & HCD_MEMORY) ? |
1875 | "io mem" : "io base", | |
1876 | (unsigned long long)hcd->rsrc_start); | |
1877 | } else { | |
1878 | hcd->irq = -1; | |
1879 | if (hcd->rsrc_start) | |
1880 | dev_info(hcd->self.controller, "%s 0x%08llx\n", | |
1881 | (hcd->driver->flags & HCD_MEMORY) ? | |
1882 | "io mem" : "io base", | |
1883 | (unsigned long long)hcd->rsrc_start); | |
1884 | } | |
1885 | ||
1886 | if ((retval = hcd->driver->start(hcd)) < 0) { | |
1887 | dev_err(hcd->self.controller, "startup error %d\n", retval); | |
8ec8d20b | 1888 | goto err_hcd_driver_start; |
1da177e4 LT |
1889 | } |
1890 | ||
b1e8f0a6 | 1891 | /* starting here, usbcore will pay attention to this root hub */ |
55c52718 | 1892 | rhdev->bus_mA = min(500u, hcd->power_budget); |
b1e8f0a6 | 1893 | if ((retval = register_root_hub(hcd)) != 0) |
8ec8d20b AS |
1894 | goto err_register_root_hub; |
1895 | ||
5234ce1b IPG |
1896 | retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group); |
1897 | if (retval < 0) { | |
1898 | printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n", | |
1899 | retval); | |
1900 | goto error_create_attr_group; | |
1901 | } | |
d5926ae7 AS |
1902 | if (hcd->uses_new_polling && hcd->poll_rh) |
1903 | usb_hcd_poll_rh_status(hcd); | |
1da177e4 LT |
1904 | return retval; |
1905 | ||
5234ce1b IPG |
1906 | error_create_attr_group: |
1907 | mutex_lock(&usb_bus_list_lock); | |
1908 | usb_disconnect(&hcd->self.root_hub); | |
1909 | mutex_unlock(&usb_bus_list_lock); | |
b1e8f0a6 | 1910 | err_register_root_hub: |
8ec8d20b | 1911 | hcd->driver->stop(hcd); |
b1e8f0a6 | 1912 | err_hcd_driver_start: |
1da177e4 LT |
1913 | if (hcd->irq >= 0) |
1914 | free_irq(irqnum, hcd); | |
b1e8f0a6 DB |
1915 | err_request_irq: |
1916 | err_hcd_driver_setup: | |
1917 | hcd->self.root_hub = NULL; | |
1918 | usb_put_dev(rhdev); | |
1919 | err_allocate_root_hub: | |
1da177e4 | 1920 | usb_deregister_bus(&hcd->self); |
b1e8f0a6 | 1921 | err_register_bus: |
1da177e4 LT |
1922 | hcd_buffer_destroy(hcd); |
1923 | return retval; | |
1924 | } | |
1925 | EXPORT_SYMBOL (usb_add_hcd); | |
1926 | ||
1927 | /** | |
1928 | * usb_remove_hcd - shutdown processing for generic HCDs | |
1929 | * @hcd: the usb_hcd structure to remove | |
1930 | * Context: !in_interrupt() | |
1931 | * | |
1932 | * Disconnects the root hub, then reverses the effects of usb_add_hcd(), | |
1933 | * invoking the HCD's stop() method. | |
1934 | */ | |
1935 | void usb_remove_hcd(struct usb_hcd *hcd) | |
1936 | { | |
1937 | dev_info(hcd->self.controller, "remove, state %x\n", hcd->state); | |
1938 | ||
1939 | if (HC_IS_RUNNING (hcd->state)) | |
1940 | hcd->state = HC_STATE_QUIESCING; | |
1941 | ||
1942 | dev_dbg(hcd->self.controller, "roothub graceful disconnect\n"); | |
1943 | spin_lock_irq (&hcd_root_hub_lock); | |
1944 | hcd->rh_registered = 0; | |
1945 | spin_unlock_irq (&hcd_root_hub_lock); | |
9ad3d6cc | 1946 | |
6b157c9b | 1947 | #ifdef CONFIG_PM |
d5d4db70 | 1948 | cancel_work_sync(&hcd->wakeup_work); |
6b157c9b AS |
1949 | #endif |
1950 | ||
5234ce1b | 1951 | sysfs_remove_group(&hcd->self.root_hub->dev.kobj, &usb_bus_attr_group); |
4186ecf8 | 1952 | mutex_lock(&usb_bus_list_lock); |
1da177e4 | 1953 | usb_disconnect(&hcd->self.root_hub); |
4186ecf8 | 1954 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
1955 | |
1956 | hcd->driver->stop(hcd); | |
1957 | hcd->state = HC_STATE_HALT; | |
1958 | ||
1b42ae6d AS |
1959 | hcd->poll_rh = 0; |
1960 | del_timer_sync(&hcd->rh_timer); | |
1961 | ||
1da177e4 LT |
1962 | if (hcd->irq >= 0) |
1963 | free_irq(hcd->irq, hcd); | |
1964 | usb_deregister_bus(&hcd->self); | |
1965 | hcd_buffer_destroy(hcd); | |
1966 | } | |
1967 | EXPORT_SYMBOL (usb_remove_hcd); | |
1968 | ||
64a21d02 AG |
1969 | void |
1970 | usb_hcd_platform_shutdown(struct platform_device* dev) | |
1971 | { | |
1972 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
1973 | ||
1974 | if (hcd->driver->shutdown) | |
1975 | hcd->driver->shutdown(hcd); | |
1976 | } | |
1977 | EXPORT_SYMBOL (usb_hcd_platform_shutdown); | |
1978 | ||
1da177e4 LT |
1979 | /*-------------------------------------------------------------------------*/ |
1980 | ||
4749f32d | 1981 | #if defined(CONFIG_USB_MON) |
1da177e4 LT |
1982 | |
1983 | struct usb_mon_operations *mon_ops; | |
1984 | ||
1985 | /* | |
1986 | * The registration is unlocked. | |
1987 | * We do it this way because we do not want to lock in hot paths. | |
1988 | * | |
1989 | * Notice that the code is minimally error-proof. Because usbmon needs | |
1990 | * symbols from usbcore, usbcore gets referenced and cannot be unloaded first. | |
1991 | */ | |
1992 | ||
1993 | int usb_mon_register (struct usb_mon_operations *ops) | |
1994 | { | |
1995 | ||
1996 | if (mon_ops) | |
1997 | return -EBUSY; | |
1998 | ||
1999 | mon_ops = ops; | |
2000 | mb(); | |
2001 | return 0; | |
2002 | } | |
2003 | EXPORT_SYMBOL_GPL (usb_mon_register); | |
2004 | ||
2005 | void usb_mon_deregister (void) | |
2006 | { | |
2007 | ||
2008 | if (mon_ops == NULL) { | |
2009 | printk(KERN_ERR "USB: monitor was not registered\n"); | |
2010 | return; | |
2011 | } | |
2012 | mon_ops = NULL; | |
2013 | mb(); | |
2014 | } | |
2015 | EXPORT_SYMBOL_GPL (usb_mon_deregister); | |
2016 | ||
2017 | #endif /* CONFIG_USB_MON */ |