Commit | Line | Data |
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90ff96f2 IPG |
1 | /* |
2 | * Wireless USB Host Controller | |
3 | * Root Hub operations | |
4 | * | |
5 | * | |
6 | * Copyright (C) 2005-2006 Intel Corporation | |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version | |
11 | * 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
21 | * 02110-1301, USA. | |
22 | * | |
23 | * | |
24 | * We fake a root hub that has fake ports (as many as simultaneous | |
25 | * devices the Wireless USB Host Controller can deal with). For each | |
26 | * port we keep an state in @wusbhc->port[index] identical to the one | |
27 | * specified in the USB2.0[ch11] spec and some extra device | |
28 | * information that complements the one in 'struct usb_device' (as | |
29 | * this lacs a hcpriv pointer). | |
30 | * | |
31 | * Note this is common to WHCI and HWA host controllers. | |
32 | * | |
33 | * Through here we enable most of the state changes that the USB stack | |
34 | * will use to connect or disconnect devices. We need to do some | |
35 | * forced adaptation of Wireless USB device states vs. wired: | |
36 | * | |
37 | * USB: WUSB: | |
38 | * | |
39 | * Port Powered-off port slot n/a | |
40 | * Powered-on port slot available | |
41 | * Disconnected port slot available | |
42 | * Connected port slot assigned device | |
43 | * device sent DN_Connect | |
44 | * device was authenticated | |
45 | * Enabled device is authenticated, transitioned | |
46 | * from unauth -> auth -> default address | |
47 | * -> enabled | |
48 | * Reset disconnect | |
49 | * Disable disconnect | |
50 | * | |
51 | * This maps the standard USB port states with the WUSB device states | |
52 | * so we can fake ports without having to modify the USB stack. | |
53 | * | |
54 | * FIXME: this process will change in the future | |
55 | * | |
56 | * | |
57 | * ENTRY POINTS | |
58 | * | |
59 | * Our entry points into here are, as in hcd.c, the USB stack root hub | |
60 | * ops defined in the usb_hcd struct: | |
61 | * | |
62 | * wusbhc_rh_status_data() Provide hub and port status data bitmap | |
63 | * | |
64 | * wusbhc_rh_control() Execution of all the major requests | |
65 | * you can do to a hub (Set|Clear | |
66 | * features, get descriptors, status, etc). | |
67 | * | |
68 | * wusbhc_rh_[suspend|resume]() That | |
69 | * | |
70 | * wusbhc_rh_start_port_reset() ??? unimplemented | |
71 | */ | |
72 | #include "wusbhc.h" | |
73 | ||
74 | #define D_LOCAL 0 | |
75 | #include <linux/uwb/debug.h> | |
76 | ||
77 | /* | |
78 | * Reset a fake port | |
79 | * | |
80 | * This can be called to reset a port from any other state or to reset | |
81 | * it when connecting. In Wireless USB they are different; when doing | |
82 | * a new connect that involves going over the authentication. When | |
83 | * just reseting, its a different story. | |
84 | * | |
85 | * The Linux USB stack resets a port twice before it considers it | |
86 | * enabled, so we have to detect and ignore that. | |
87 | * | |
88 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
89 | * | |
90 | * Supposedly we are the only thread accesing @wusbhc->port; in any | |
91 | * case, maybe we should move the mutex locking from | |
92 | * wusbhc_devconnect_auth() to here. | |
93 | * | |
94 | * @port_idx refers to the wusbhc's port index, not the USB port number | |
95 | */ | |
96 | static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx) | |
97 | { | |
98 | int result = 0; | |
99 | struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx); | |
100 | ||
101 | d_fnstart(3, wusbhc->dev, "(wusbhc %p port_idx %u)\n", | |
102 | wusbhc, port_idx); | |
103 | if (port->reset_count == 0) { | |
104 | wusbhc_devconnect_auth(wusbhc, port_idx); | |
105 | port->reset_count++; | |
106 | } else if (port->reset_count == 1) | |
107 | /* see header */ | |
108 | d_printf(2, wusbhc->dev, "Ignoring second reset on port_idx " | |
109 | "%u\n", port_idx); | |
110 | else | |
111 | result = wusbhc_dev_reset(wusbhc, port_idx); | |
112 | d_fnend(3, wusbhc->dev, "(wusbhc %p port_idx %u) = %d\n", | |
113 | wusbhc, port_idx, result); | |
114 | return result; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Return the hub change status bitmap | |
119 | * | |
120 | * The bits in the change status bitmap are cleared when a | |
121 | * ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4]. | |
122 | * | |
123 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
124 | * | |
125 | * WARNING!! This gets called from atomic context; we cannot get the | |
126 | * mutex--the only race condition we can find is some bit | |
127 | * changing just after we copy it, which shouldn't be too | |
128 | * big of a problem [and we can't make it an spinlock | |
129 | * because other parts need to take it and sleep] . | |
130 | * | |
131 | * @usb_hcd is refcounted, so it won't dissapear under us | |
132 | * and before killing a host, the polling of the root hub | |
133 | * would be stopped anyway. | |
134 | */ | |
135 | int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf) | |
136 | { | |
137 | struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); | |
138 | size_t cnt, size; | |
139 | unsigned long *buf = (unsigned long *) _buf; | |
140 | ||
141 | d_fnstart(1, wusbhc->dev, "(wusbhc %p)\n", wusbhc); | |
142 | /* WE DON'T LOCK, see comment */ | |
143 | size = wusbhc->ports_max + 1 /* hub bit */; | |
144 | size = (size + 8 - 1) / 8; /* round to bytes */ | |
145 | for (cnt = 0; cnt < wusbhc->ports_max; cnt++) | |
146 | if (wusb_port_by_idx(wusbhc, cnt)->change) | |
147 | set_bit(cnt + 1, buf); | |
148 | else | |
149 | clear_bit(cnt + 1, buf); | |
150 | d_fnend(1, wusbhc->dev, "(wusbhc %p) %u, buffer:\n", wusbhc, (int)size); | |
151 | d_dump(1, wusbhc->dev, _buf, size); | |
152 | return size; | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(wusbhc_rh_status_data); | |
155 | ||
156 | /* | |
157 | * Return the hub's desciptor | |
158 | * | |
159 | * NOTE: almost cut and paste from ehci-hub.c | |
160 | * | |
161 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked | |
162 | */ | |
163 | static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue, | |
164 | u16 wIndex, | |
165 | struct usb_hub_descriptor *descr, | |
166 | u16 wLength) | |
167 | { | |
168 | u16 temp = 1 + (wusbhc->ports_max / 8); | |
169 | u8 length = 7 + 2 * temp; | |
170 | ||
171 | if (wLength < length) | |
172 | return -ENOSPC; | |
173 | descr->bDescLength = 7 + 2 * temp; | |
174 | descr->bDescriptorType = 0x29; /* HUB type */ | |
175 | descr->bNbrPorts = wusbhc->ports_max; | |
176 | descr->wHubCharacteristics = cpu_to_le16( | |
177 | 0x00 /* All ports power at once */ | |
178 | | 0x00 /* not part of compound device */ | |
179 | | 0x10 /* No overcurrent protection */ | |
180 | | 0x00 /* 8 FS think time FIXME ?? */ | |
181 | | 0x00); /* No port indicators */ | |
182 | descr->bPwrOn2PwrGood = 0; | |
183 | descr->bHubContrCurrent = 0; | |
184 | /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ | |
185 | memset(&descr->bitmap[0], 0, temp); | |
186 | memset(&descr->bitmap[temp], 0xff, temp); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Clear a hub feature | |
192 | * | |
193 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
194 | * | |
195 | * Nothing to do, so no locking needed ;) | |
196 | */ | |
197 | static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature) | |
198 | { | |
199 | int result; | |
200 | struct device *dev = wusbhc->dev; | |
201 | ||
202 | d_fnstart(4, dev, "(%p, feature 0x%04u)\n", wusbhc, feature); | |
203 | switch (feature) { | |
204 | case C_HUB_LOCAL_POWER: | |
205 | /* FIXME: maybe plug bit 0 to the power input status, | |
206 | * if any? | |
207 | * see wusbhc_rh_get_hub_status() */ | |
208 | case C_HUB_OVER_CURRENT: | |
209 | result = 0; | |
210 | break; | |
211 | default: | |
212 | result = -EPIPE; | |
213 | } | |
214 | d_fnend(4, dev, "(%p, feature 0x%04u), %d\n", wusbhc, feature, result); | |
215 | return result; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Return hub status (it is always zero...) | |
220 | * | |
221 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
222 | * | |
223 | * Nothing to do, so no locking needed ;) | |
224 | */ | |
225 | static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf, | |
226 | u16 wLength) | |
227 | { | |
228 | /* FIXME: maybe plug bit 0 to the power input status (if any)? */ | |
229 | *buf = 0; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Set a port feature | |
235 | * | |
236 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
237 | */ | |
238 | static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature, | |
239 | u8 selector, u8 port_idx) | |
240 | { | |
241 | int result = -EINVAL; | |
242 | struct device *dev = wusbhc->dev; | |
243 | ||
244 | d_fnstart(4, dev, "(feat 0x%04u, selector 0x%u, port_idx %d)\n", | |
245 | feature, selector, port_idx); | |
246 | ||
247 | if (port_idx > wusbhc->ports_max) | |
248 | goto error; | |
249 | ||
250 | switch (feature) { | |
251 | /* According to USB2.0[11.24.2.13]p2, these features | |
252 | * are not required to be implemented. */ | |
253 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
254 | case USB_PORT_FEAT_C_ENABLE: | |
255 | case USB_PORT_FEAT_C_SUSPEND: | |
256 | case USB_PORT_FEAT_C_CONNECTION: | |
257 | case USB_PORT_FEAT_C_RESET: | |
258 | result = 0; | |
259 | break; | |
260 | ||
261 | case USB_PORT_FEAT_POWER: | |
262 | /* No such thing, but we fake it works */ | |
263 | mutex_lock(&wusbhc->mutex); | |
264 | wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER; | |
265 | mutex_unlock(&wusbhc->mutex); | |
266 | result = 0; | |
267 | break; | |
268 | case USB_PORT_FEAT_RESET: | |
269 | result = wusbhc_rh_port_reset(wusbhc, port_idx); | |
270 | break; | |
271 | case USB_PORT_FEAT_ENABLE: | |
272 | case USB_PORT_FEAT_SUSPEND: | |
273 | dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n", | |
274 | port_idx, feature, selector); | |
275 | result = -ENOSYS; | |
276 | break; | |
277 | default: | |
278 | dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n", | |
279 | port_idx, feature, selector); | |
280 | result = -EPIPE; | |
281 | break; | |
282 | } | |
283 | error: | |
284 | d_fnend(4, dev, "(feat 0x%04u, selector 0x%u, port_idx %d) = %d\n", | |
285 | feature, selector, port_idx, result); | |
286 | return result; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Clear a port feature... | |
291 | * | |
292 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
293 | */ | |
294 | static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature, | |
295 | u8 selector, u8 port_idx) | |
296 | { | |
297 | int result = -EINVAL; | |
298 | struct device *dev = wusbhc->dev; | |
299 | ||
300 | d_fnstart(4, dev, "(wusbhc %p feat 0x%04x selector %d port_idx %d)\n", | |
301 | wusbhc, feature, selector, port_idx); | |
302 | ||
303 | if (port_idx > wusbhc->ports_max) | |
304 | goto error; | |
305 | ||
306 | mutex_lock(&wusbhc->mutex); | |
307 | result = 0; | |
308 | switch (feature) { | |
309 | case USB_PORT_FEAT_POWER: /* fake port always on */ | |
310 | /* According to USB2.0[11.24.2.7.1.4], no need to implement? */ | |
311 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
312 | break; | |
313 | case USB_PORT_FEAT_C_RESET: | |
314 | wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET; | |
315 | break; | |
316 | case USB_PORT_FEAT_C_CONNECTION: | |
317 | wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION; | |
318 | break; | |
319 | case USB_PORT_FEAT_ENABLE: | |
320 | __wusbhc_dev_disable(wusbhc, port_idx); | |
321 | break; | |
322 | case USB_PORT_FEAT_C_ENABLE: | |
323 | wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE; | |
324 | break; | |
325 | case USB_PORT_FEAT_SUSPEND: | |
326 | case USB_PORT_FEAT_C_SUSPEND: | |
327 | case 0xffff: /* ??? FIXME */ | |
328 | dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n", | |
329 | port_idx, feature, selector); | |
330 | /* dump_stack(); */ | |
331 | result = -ENOSYS; | |
332 | break; | |
333 | default: | |
334 | dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n", | |
335 | port_idx, feature, selector); | |
336 | result = -EPIPE; | |
337 | break; | |
338 | } | |
339 | mutex_unlock(&wusbhc->mutex); | |
340 | error: | |
341 | d_fnend(4, dev, "(wusbhc %p feat 0x%04x selector %d port_idx %d) = " | |
342 | "%d\n", wusbhc, feature, selector, port_idx, result); | |
343 | return result; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Return the port's status | |
348 | * | |
349 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
350 | */ | |
351 | static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx, | |
352 | u32 *_buf, u16 wLength) | |
353 | { | |
354 | int result = -EINVAL; | |
355 | u16 *buf = (u16 *) _buf; | |
356 | ||
357 | d_fnstart(1, wusbhc->dev, "(wusbhc %p port_idx %u wLength %u)\n", | |
358 | wusbhc, port_idx, wLength); | |
359 | if (port_idx > wusbhc->ports_max) | |
360 | goto error; | |
361 | mutex_lock(&wusbhc->mutex); | |
362 | buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status); | |
363 | buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change); | |
364 | result = 0; | |
365 | mutex_unlock(&wusbhc->mutex); | |
366 | error: | |
367 | d_fnend(1, wusbhc->dev, "(wusbhc %p) = %d, buffer:\n", wusbhc, result); | |
368 | d_dump(1, wusbhc->dev, _buf, wLength); | |
369 | return result; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Entry point for Root Hub operations | |
374 | * | |
375 | * @wusbhc is assumed referenced and @wusbhc->mutex unlocked. | |
376 | */ | |
377 | int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue, | |
378 | u16 wIndex, char *buf, u16 wLength) | |
379 | { | |
380 | int result = -ENOSYS; | |
381 | struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); | |
382 | ||
383 | switch (reqntype) { | |
384 | case GetHubDescriptor: | |
385 | result = wusbhc_rh_get_hub_descr( | |
386 | wusbhc, wValue, wIndex, | |
387 | (struct usb_hub_descriptor *) buf, wLength); | |
388 | break; | |
389 | case ClearHubFeature: | |
390 | result = wusbhc_rh_clear_hub_feat(wusbhc, wValue); | |
391 | break; | |
392 | case GetHubStatus: | |
393 | result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength); | |
394 | break; | |
395 | ||
396 | case SetPortFeature: | |
397 | result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8, | |
398 | (wIndex & 0xff) - 1); | |
399 | break; | |
400 | case ClearPortFeature: | |
401 | result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8, | |
402 | (wIndex & 0xff) - 1); | |
403 | break; | |
404 | case GetPortStatus: | |
405 | result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1, | |
406 | (u32 *)buf, wLength); | |
407 | break; | |
408 | ||
409 | case SetHubFeature: | |
410 | default: | |
411 | dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) " | |
412 | "UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype, | |
413 | wValue, wIndex, buf, wLength); | |
414 | /* dump_stack(); */ | |
415 | result = -ENOSYS; | |
416 | } | |
417 | return result; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(wusbhc_rh_control); | |
420 | ||
421 | int wusbhc_rh_suspend(struct usb_hcd *usb_hcd) | |
422 | { | |
423 | struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); | |
424 | dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__, | |
425 | usb_hcd, wusbhc); | |
426 | /* dump_stack(); */ | |
427 | return -ENOSYS; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(wusbhc_rh_suspend); | |
430 | ||
431 | int wusbhc_rh_resume(struct usb_hcd *usb_hcd) | |
432 | { | |
433 | struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); | |
434 | dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__, | |
435 | usb_hcd, wusbhc); | |
436 | /* dump_stack(); */ | |
437 | return -ENOSYS; | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(wusbhc_rh_resume); | |
440 | ||
441 | int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx) | |
442 | { | |
443 | struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd); | |
444 | dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n", | |
445 | __func__, usb_hcd, wusbhc, port_idx); | |
446 | WARN_ON(1); | |
447 | return -ENOSYS; | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset); | |
450 | ||
451 | static void wusb_port_init(struct wusb_port *port) | |
452 | { | |
453 | port->status |= USB_PORT_STAT_HIGH_SPEED; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Alloc fake port specific fields and status. | |
458 | */ | |
459 | int wusbhc_rh_create(struct wusbhc *wusbhc) | |
460 | { | |
461 | int result = -ENOMEM; | |
462 | size_t port_size, itr; | |
463 | port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]); | |
464 | wusbhc->port = kzalloc(port_size, GFP_KERNEL); | |
465 | if (wusbhc->port == NULL) | |
466 | goto error_port_alloc; | |
467 | for (itr = 0; itr < wusbhc->ports_max; itr++) | |
468 | wusb_port_init(&wusbhc->port[itr]); | |
469 | result = 0; | |
470 | error_port_alloc: | |
471 | return result; | |
472 | } | |
473 | ||
474 | void wusbhc_rh_destroy(struct wusbhc *wusbhc) | |
475 | { | |
476 | kfree(wusbhc->port); | |
477 | } |