drivers/usb/wusbcore/rh.c

   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 <linux/slab.h>
  73 #include "wusbhc.h"
  74
  75 /*
  76  * Reset a fake port
  77  *
  78  * Using a Reset Device IE is too heavyweight as it causes the device
  79  * to enter the UnConnected state and leave the cluster, this can mean
  80  * that when the device reconnects it is connected to a different fake
  81  * port.
  82  *
  83  * Instead, reset authenticated devices with a SetAddress(0), followed
  84  * by a SetAddresss(AuthAddr).
  85  *
  86  * For unauthenticated devices just pretend to reset but do nothing.
  87  * If the device initialization continues to fail it will eventually
  88  * time out after TrustTimeout and enter the UnConnected state.
  89  *
  90  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
  91  *
  92  * Supposedly we are the only thread accesing @wusbhc->port; in any
  93  * case, maybe we should move the mutex locking from
  94  * wusbhc_devconnect_auth() to here.
  95  *
  96  * @port_idx refers to the wusbhc's port index, not the USB port number
  97  */
  98 static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
  99 {
 100         int result = 0;
 101         struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
 102         struct wusb_dev *wusb_dev = port->wusb_dev;
 103
 104         if (wusb_dev == NULL)
 105                 return -ENOTCONN;
 106
 107         port->status |= USB_PORT_STAT_RESET;
 108         port->change |= USB_PORT_STAT_C_RESET;
 109
 110         if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
 111                 result = 0;
 112         else
 113                 result = wusb_dev_update_address(wusbhc, wusb_dev);
 114
 115         port->status &= ~USB_PORT_STAT_RESET;
 116         port->status |= USB_PORT_STAT_ENABLE;
 117         port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE;
 118
 119         return result;
 120 }
 121
 122 /*
 123  * Return the hub change status bitmap
 124  *
 125  * The bits in the change status bitmap are cleared when a
 126  * ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
 127  *
 128  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 129  *
 130  * WARNING!! This gets called from atomic context; we cannot get the
 131  *           mutex--the only race condition we can find is some bit
 132  *           changing just after we copy it, which shouldn't be too
 133  *           big of a problem [and we can't make it an spinlock
 134  *           because other parts need to take it and sleep] .
 135  *
 136  *           @usb_hcd is refcounted, so it won't disappear under us
 137  *           and before killing a host, the polling of the root hub
 138  *           would be stopped anyway.
 139  */
 140 int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf)
 141 {
 142         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 143         size_t cnt, size;
 144         unsigned long *buf = (unsigned long *) _buf;
 145
 146         /* WE DON'T LOCK, see comment */
 147         size = wusbhc->ports_max + 1 /* hub bit */;
 148         size = (size + 8 - 1) / 8;      /* round to bytes */
 149         for (cnt = 0; cnt < wusbhc->ports_max; cnt++)
 150                 if (wusb_port_by_idx(wusbhc, cnt)->change)
 151                         set_bit(cnt + 1, buf);
 152                 else
 153                         clear_bit(cnt + 1, buf);
 154         return size;
 155 }
 156 EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);
 157
 158 /*
 159  * Return the hub's descriptor
 160  *
 161  * NOTE: almost cut and paste from ehci-hub.c
 162  *
 163  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked
 164  */
 165 static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
 166                                    u16 wIndex,
 167                                    struct usb_hub_descriptor *descr,
 168                                    u16 wLength)
 169 {
 170         u16 temp = 1 + (wusbhc->ports_max / 8);
 171         u8 length = 7 + 2 * temp;
 172
 173         if (wLength < length)
 174                 return -ENOSPC;
 175         descr->bDescLength = 7 + 2 * temp;
 176         descr->bDescriptorType = 0x29;  /* HUB type */
 177         descr->bNbrPorts = wusbhc->ports_max;
 178         descr->wHubCharacteristics = cpu_to_le16(
 179                 0x00                    /* All ports power at once */
 180                 | 0x00                  /* not part of compound device */
 181                 | 0x10                  /* No overcurrent protection */
 182                 | 0x00                  /* 8 FS think time FIXME ?? */
 183                 | 0x00);                /* No port indicators */
 184         descr->bPwrOn2PwrGood = 0;
 185         descr->bHubContrCurrent = 0;
 186         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 187         memset(&descr->u.hs.DeviceRemovable[0], 0, temp);
 188         memset(&descr->u.hs.DeviceRemovable[temp], 0xff, temp);
 189         return 0;
 190 }
 191
 192 /*
 193  * Clear a hub feature
 194  *
 195  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 196  *
 197  * Nothing to do, so no locking needed ;)
 198  */
 199 static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
 200 {
 201         int result;
 202
 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         return result;
 215 }
 216
 217 /*
 218  * Return hub status (it is always zero...)
 219  *
 220  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 221  *
 222  * Nothing to do, so no locking needed ;)
 223  */
 224 static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf,
 225                                     u16 wLength)
 226 {
 227         /* FIXME: maybe plug bit 0 to the power input status (if any)? */
 228         *buf = 0;
 229         return 0;
 230 }
 231
 232 /*
 233  * Set a port feature
 234  *
 235  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 236  */
 237 static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
 238                                    u8 selector, u8 port_idx)
 239 {
 240         struct device *dev = wusbhc->dev;
 241
 242         if (port_idx > wusbhc->ports_max)
 243                 return -EINVAL;
 244
 245         switch (feature) {
 246                 /* According to USB2.0[11.24.2.13]p2, these features
 247                  * are not required to be implemented. */
 248         case USB_PORT_FEAT_C_OVER_CURRENT:
 249         case USB_PORT_FEAT_C_ENABLE:
 250         case USB_PORT_FEAT_C_SUSPEND:
 251         case USB_PORT_FEAT_C_CONNECTION:
 252         case USB_PORT_FEAT_C_RESET:
 253                 return 0;
 254         case USB_PORT_FEAT_POWER:
 255                 /* No such thing, but we fake it works */
 256                 mutex_lock(&wusbhc->mutex);
 257                 wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER;
 258                 mutex_unlock(&wusbhc->mutex);
 259                 return 0;
 260         case USB_PORT_FEAT_RESET:
 261                 return wusbhc_rh_port_reset(wusbhc, port_idx);
 262         case USB_PORT_FEAT_ENABLE:
 263         case USB_PORT_FEAT_SUSPEND:
 264                 dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
 265                         port_idx, feature, selector);
 266                 return -ENOSYS;
 267         default:
 268                 dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
 269                         port_idx, feature, selector);
 270                 return -EPIPE;
 271         }
 272
 273         return 0;
 274 }
 275
 276 /*
 277  * Clear a port feature...
 278  *
 279  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 280  */
 281 static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
 282                                      u8 selector, u8 port_idx)
 283 {
 284         int result = 0;
 285         struct device *dev = wusbhc->dev;
 286
 287         if (port_idx > wusbhc->ports_max)
 288                 return -EINVAL;
 289
 290         mutex_lock(&wusbhc->mutex);
 291         switch (feature) {
 292         case USB_PORT_FEAT_POWER:       /* fake port always on */
 293                 /* According to USB2.0[11.24.2.7.1.4], no need to implement? */
 294         case USB_PORT_FEAT_C_OVER_CURRENT:
 295                 break;
 296         case USB_PORT_FEAT_C_RESET:
 297                 wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
 298                 break;
 299         case USB_PORT_FEAT_C_CONNECTION:
 300                 wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
 301                 break;
 302         case USB_PORT_FEAT_ENABLE:
 303                 __wusbhc_dev_disable(wusbhc, port_idx);
 304                 break;
 305         case USB_PORT_FEAT_C_ENABLE:
 306                 wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
 307                 break;
 308         case USB_PORT_FEAT_SUSPEND:
 309         case USB_PORT_FEAT_C_SUSPEND:
 310                 dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
 311                         port_idx, feature, selector);
 312                 result = -ENOSYS;
 313                 break;
 314         default:
 315                 dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
 316                         port_idx, feature, selector);
 317                 result = -EPIPE;
 318                 break;
 319         }
 320         mutex_unlock(&wusbhc->mutex);
 321
 322         return result;
 323 }
 324
 325 /*
 326  * Return the port's status
 327  *
 328  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 329  */
 330 static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
 331                                      u32 *_buf, u16 wLength)
 332 {
 333         __le16 *buf = (__le16 *)_buf;
 334
 335         if (port_idx > wusbhc->ports_max)
 336                 return -EINVAL;
 337
 338         mutex_lock(&wusbhc->mutex);
 339         buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
 340         buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
 341         mutex_unlock(&wusbhc->mutex);
 342
 343         return 0;
 344 }
 345
 346 /*
 347  * Entry point for Root Hub operations
 348  *
 349  * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 350  */
 351 int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
 352                       u16 wIndex, char *buf, u16 wLength)
 353 {
 354         int result = -ENOSYS;
 355         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 356
 357         switch (reqntype) {
 358         case GetHubDescriptor:
 359                 result = wusbhc_rh_get_hub_descr(
 360                         wusbhc, wValue, wIndex,
 361                         (struct usb_hub_descriptor *) buf, wLength);
 362                 break;
 363         case ClearHubFeature:
 364                 result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
 365                 break;
 366         case GetHubStatus:
 367                 result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
 368                 break;
 369
 370         case SetPortFeature:
 371                 result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
 372                                                  (wIndex & 0xff) - 1);
 373                 break;
 374         case ClearPortFeature:
 375                 result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
 376                                                    (wIndex & 0xff) - 1);
 377                 break;
 378         case GetPortStatus:
 379                 result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
 380                                                    (u32 *)buf, wLength);
 381                 break;
 382
 383         case SetHubFeature:
 384         default:
 385                 dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
 386                         "UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
 387                         wValue, wIndex, buf, wLength);
 388                 /* dump_stack(); */
 389                 result = -ENOSYS;
 390         }
 391         return result;
 392 }
 393 EXPORT_SYMBOL_GPL(wusbhc_rh_control);
 394
 395 int wusbhc_rh_suspend(struct usb_hcd *usb_hcd)
 396 {
 397         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 398         dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
 399                 usb_hcd, wusbhc);
 400         /* dump_stack(); */
 401         return -ENOSYS;
 402 }
 403 EXPORT_SYMBOL_GPL(wusbhc_rh_suspend);
 404
 405 int wusbhc_rh_resume(struct usb_hcd *usb_hcd)
 406 {
 407         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 408         dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
 409                 usb_hcd, wusbhc);
 410         /* dump_stack(); */
 411         return -ENOSYS;
 412 }
 413 EXPORT_SYMBOL_GPL(wusbhc_rh_resume);
 414
 415 int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
 416 {
 417         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 418         dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
 419                 __func__, usb_hcd, wusbhc, port_idx);
 420         WARN_ON(1);
 421         return -ENOSYS;
 422 }
 423 EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);
 424
 425 static void wusb_port_init(struct wusb_port *port)
 426 {
 427         port->status |= USB_PORT_STAT_HIGH_SPEED;
 428 }
 429
 430 /*
 431  * Alloc fake port specific fields and status.
 432  */
 433 int wusbhc_rh_create(struct wusbhc *wusbhc)
 434 {
 435         int result = -ENOMEM;
 436         size_t port_size, itr;
 437         port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
 438         wusbhc->port = kzalloc(port_size, GFP_KERNEL);
 439         if (wusbhc->port == NULL)
 440                 goto error_port_alloc;
 441         for (itr = 0; itr < wusbhc->ports_max; itr++)
 442                 wusb_port_init(&wusbhc->port[itr]);
 443         result = 0;
 444 error_port_alloc:
 445         return result;
 446 }
 447
 448 void wusbhc_rh_destroy(struct wusbhc *wusbhc)
 449 {
 450         kfree(wusbhc->port);
 451 }