| 1 | /* |
| 2 | * USB hub driver. |
| 3 | * |
| 4 | * (C) Copyright 1999 Linus Torvalds |
| 5 | * (C) Copyright 1999 Johannes Erdfelt |
| 6 | * (C) Copyright 1999 Gregory P. Smith |
| 7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/completion.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/ioctl.h> |
| 20 | #include <linux/usb.h> |
| 21 | #include <linux/usbdevice_fs.h> |
| 22 | #include <linux/usb/hcd.h> |
| 23 | #include <linux/usb/quirks.h> |
| 24 | #include <linux/kthread.h> |
| 25 | #include <linux/mutex.h> |
| 26 | #include <linux/freezer.h> |
| 27 | |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/byteorder.h> |
| 30 | |
| 31 | #include "usb.h" |
| 32 | |
| 33 | /* if we are in debug mode, always announce new devices */ |
| 34 | #ifdef DEBUG |
| 35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| 36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| 37 | #endif |
| 38 | #endif |
| 39 | |
| 40 | struct usb_hub { |
| 41 | struct device *intfdev; /* the "interface" device */ |
| 42 | struct usb_device *hdev; |
| 43 | struct kref kref; |
| 44 | struct urb *urb; /* for interrupt polling pipe */ |
| 45 | |
| 46 | /* buffer for urb ... with extra space in case of babble */ |
| 47 | char (*buffer)[8]; |
| 48 | union { |
| 49 | struct usb_hub_status hub; |
| 50 | struct usb_port_status port; |
| 51 | } *status; /* buffer for status reports */ |
| 52 | struct mutex status_mutex; /* for the status buffer */ |
| 53 | |
| 54 | int error; /* last reported error */ |
| 55 | int nerrors; /* track consecutive errors */ |
| 56 | |
| 57 | struct list_head event_list; /* hubs w/data or errs ready */ |
| 58 | unsigned long event_bits[1]; /* status change bitmask */ |
| 59 | unsigned long change_bits[1]; /* ports with logical connect |
| 60 | status change */ |
| 61 | unsigned long busy_bits[1]; /* ports being reset or |
| 62 | resumed */ |
| 63 | unsigned long removed_bits[1]; /* ports with a "removed" |
| 64 | device present */ |
| 65 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ |
| 66 | #error event_bits[] is too short! |
| 67 | #endif |
| 68 | |
| 69 | struct usb_hub_descriptor *descriptor; /* class descriptor */ |
| 70 | struct usb_tt tt; /* Transaction Translator */ |
| 71 | |
| 72 | unsigned mA_per_port; /* current for each child */ |
| 73 | |
| 74 | unsigned limited_power:1; |
| 75 | unsigned quiescing:1; |
| 76 | unsigned disconnected:1; |
| 77 | |
| 78 | unsigned has_indicators:1; |
| 79 | u8 indicator[USB_MAXCHILDREN]; |
| 80 | struct delayed_work leds; |
| 81 | struct delayed_work init_work; |
| 82 | void **port_owners; |
| 83 | }; |
| 84 | |
| 85 | static inline int hub_is_superspeed(struct usb_device *hdev) |
| 86 | { |
| 87 | return (hdev->descriptor.bDeviceProtocol == 3); |
| 88 | } |
| 89 | |
| 90 | /* Protect struct usb_device->state and ->children members |
| 91 | * Note: Both are also protected by ->dev.sem, except that ->state can |
| 92 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
| 93 | static DEFINE_SPINLOCK(device_state_lock); |
| 94 | |
| 95 | /* khubd's worklist and its lock */ |
| 96 | static DEFINE_SPINLOCK(hub_event_lock); |
| 97 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ |
| 98 | |
| 99 | /* Wakes up khubd */ |
| 100 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); |
| 101 | |
| 102 | static struct task_struct *khubd_task; |
| 103 | |
| 104 | /* cycle leds on hubs that aren't blinking for attention */ |
| 105 | static int blinkenlights = 0; |
| 106 | module_param (blinkenlights, bool, S_IRUGO); |
| 107 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); |
| 108 | |
| 109 | /* |
| 110 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about |
| 111 | * 10 seconds to send reply for the initial 64-byte descriptor request. |
| 112 | */ |
| 113 | /* define initial 64-byte descriptor request timeout in milliseconds */ |
| 114 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; |
| 115 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); |
| 116 | MODULE_PARM_DESC(initial_descriptor_timeout, |
| 117 | "initial 64-byte descriptor request timeout in milliseconds " |
| 118 | "(default 5000 - 5.0 seconds)"); |
| 119 | |
| 120 | /* |
| 121 | * As of 2.6.10 we introduce a new USB device initialization scheme which |
| 122 | * closely resembles the way Windows works. Hopefully it will be compatible |
| 123 | * with a wider range of devices than the old scheme. However some previously |
| 124 | * working devices may start giving rise to "device not accepting address" |
| 125 | * errors; if that happens the user can try the old scheme by adjusting the |
| 126 | * following module parameters. |
| 127 | * |
| 128 | * For maximum flexibility there are two boolean parameters to control the |
| 129 | * hub driver's behavior. On the first initialization attempt, if the |
| 130 | * "old_scheme_first" parameter is set then the old scheme will be used, |
| 131 | * otherwise the new scheme is used. If that fails and "use_both_schemes" |
| 132 | * is set, then the driver will make another attempt, using the other scheme. |
| 133 | */ |
| 134 | static int old_scheme_first = 0; |
| 135 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
| 136 | MODULE_PARM_DESC(old_scheme_first, |
| 137 | "start with the old device initialization scheme"); |
| 138 | |
| 139 | static int use_both_schemes = 1; |
| 140 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
| 141 | MODULE_PARM_DESC(use_both_schemes, |
| 142 | "try the other device initialization scheme if the " |
| 143 | "first one fails"); |
| 144 | |
| 145 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
| 146 | * port reset on some companion controllers. |
| 147 | */ |
| 148 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); |
| 149 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); |
| 150 | |
| 151 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
| 152 | #define HUB_DEBOUNCE_STEP 25 |
| 153 | #define HUB_DEBOUNCE_STABLE 100 |
| 154 | |
| 155 | |
| 156 | static int usb_reset_and_verify_device(struct usb_device *udev); |
| 157 | |
| 158 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
| 159 | { |
| 160 | if (hub_is_superspeed(hub->hdev)) |
| 161 | return "5.0 Gb/s"; |
| 162 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| 163 | return "480 Mb/s"; |
| 164 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| 165 | return "1.5 Mb/s"; |
| 166 | else |
| 167 | return "12 Mb/s"; |
| 168 | } |
| 169 | |
| 170 | /* Note that hdev or one of its children must be locked! */ |
| 171 | static struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
| 172 | { |
| 173 | if (!hdev || !hdev->actconfig) |
| 174 | return NULL; |
| 175 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
| 176 | } |
| 177 | |
| 178 | /* USB 2.0 spec Section 11.24.4.5 */ |
| 179 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
| 180 | { |
| 181 | int i, ret, size; |
| 182 | unsigned dtype; |
| 183 | |
| 184 | if (hub_is_superspeed(hdev)) { |
| 185 | dtype = USB_DT_SS_HUB; |
| 186 | size = USB_DT_SS_HUB_SIZE; |
| 187 | } else { |
| 188 | dtype = USB_DT_HUB; |
| 189 | size = sizeof(struct usb_hub_descriptor); |
| 190 | } |
| 191 | |
| 192 | for (i = 0; i < 3; i++) { |
| 193 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 194 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
| 195 | dtype << 8, 0, data, size, |
| 196 | USB_CTRL_GET_TIMEOUT); |
| 197 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) |
| 198 | return ret; |
| 199 | } |
| 200 | return -EINVAL; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * USB 2.0 spec Section 11.24.2.1 |
| 205 | */ |
| 206 | static int clear_hub_feature(struct usb_device *hdev, int feature) |
| 207 | { |
| 208 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 209 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * USB 2.0 spec Section 11.24.2.2 |
| 214 | */ |
| 215 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) |
| 216 | { |
| 217 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 218 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
| 219 | NULL, 0, 1000); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * USB 2.0 spec Section 11.24.2.13 |
| 224 | */ |
| 225 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
| 226 | { |
| 227 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 228 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
| 229 | NULL, 0, 1000); |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
| 234 | * for info about using port indicators |
| 235 | */ |
| 236 | static void set_port_led( |
| 237 | struct usb_hub *hub, |
| 238 | int port1, |
| 239 | int selector |
| 240 | ) |
| 241 | { |
| 242 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, |
| 243 | USB_PORT_FEAT_INDICATOR); |
| 244 | if (status < 0) |
| 245 | dev_dbg (hub->intfdev, |
| 246 | "port %d indicator %s status %d\n", |
| 247 | port1, |
| 248 | ({ char *s; switch (selector) { |
| 249 | case HUB_LED_AMBER: s = "amber"; break; |
| 250 | case HUB_LED_GREEN: s = "green"; break; |
| 251 | case HUB_LED_OFF: s = "off"; break; |
| 252 | case HUB_LED_AUTO: s = "auto"; break; |
| 253 | default: s = "??"; break; |
| 254 | }; s; }), |
| 255 | status); |
| 256 | } |
| 257 | |
| 258 | #define LED_CYCLE_PERIOD ((2*HZ)/3) |
| 259 | |
| 260 | static void led_work (struct work_struct *work) |
| 261 | { |
| 262 | struct usb_hub *hub = |
| 263 | container_of(work, struct usb_hub, leds.work); |
| 264 | struct usb_device *hdev = hub->hdev; |
| 265 | unsigned i; |
| 266 | unsigned changed = 0; |
| 267 | int cursor = -1; |
| 268 | |
| 269 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
| 270 | return; |
| 271 | |
| 272 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { |
| 273 | unsigned selector, mode; |
| 274 | |
| 275 | /* 30%-50% duty cycle */ |
| 276 | |
| 277 | switch (hub->indicator[i]) { |
| 278 | /* cycle marker */ |
| 279 | case INDICATOR_CYCLE: |
| 280 | cursor = i; |
| 281 | selector = HUB_LED_AUTO; |
| 282 | mode = INDICATOR_AUTO; |
| 283 | break; |
| 284 | /* blinking green = sw attention */ |
| 285 | case INDICATOR_GREEN_BLINK: |
| 286 | selector = HUB_LED_GREEN; |
| 287 | mode = INDICATOR_GREEN_BLINK_OFF; |
| 288 | break; |
| 289 | case INDICATOR_GREEN_BLINK_OFF: |
| 290 | selector = HUB_LED_OFF; |
| 291 | mode = INDICATOR_GREEN_BLINK; |
| 292 | break; |
| 293 | /* blinking amber = hw attention */ |
| 294 | case INDICATOR_AMBER_BLINK: |
| 295 | selector = HUB_LED_AMBER; |
| 296 | mode = INDICATOR_AMBER_BLINK_OFF; |
| 297 | break; |
| 298 | case INDICATOR_AMBER_BLINK_OFF: |
| 299 | selector = HUB_LED_OFF; |
| 300 | mode = INDICATOR_AMBER_BLINK; |
| 301 | break; |
| 302 | /* blink green/amber = reserved */ |
| 303 | case INDICATOR_ALT_BLINK: |
| 304 | selector = HUB_LED_GREEN; |
| 305 | mode = INDICATOR_ALT_BLINK_OFF; |
| 306 | break; |
| 307 | case INDICATOR_ALT_BLINK_OFF: |
| 308 | selector = HUB_LED_AMBER; |
| 309 | mode = INDICATOR_ALT_BLINK; |
| 310 | break; |
| 311 | default: |
| 312 | continue; |
| 313 | } |
| 314 | if (selector != HUB_LED_AUTO) |
| 315 | changed = 1; |
| 316 | set_port_led(hub, i + 1, selector); |
| 317 | hub->indicator[i] = mode; |
| 318 | } |
| 319 | if (!changed && blinkenlights) { |
| 320 | cursor++; |
| 321 | cursor %= hub->descriptor->bNbrPorts; |
| 322 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
| 323 | hub->indicator[cursor] = INDICATOR_CYCLE; |
| 324 | changed++; |
| 325 | } |
| 326 | if (changed) |
| 327 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 328 | } |
| 329 | |
| 330 | /* use a short timeout for hub/port status fetches */ |
| 331 | #define USB_STS_TIMEOUT 1000 |
| 332 | #define USB_STS_RETRIES 5 |
| 333 | |
| 334 | /* |
| 335 | * USB 2.0 spec Section 11.24.2.6 |
| 336 | */ |
| 337 | static int get_hub_status(struct usb_device *hdev, |
| 338 | struct usb_hub_status *data) |
| 339 | { |
| 340 | int i, status = -ETIMEDOUT; |
| 341 | |
| 342 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 343 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 344 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
| 345 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 346 | } |
| 347 | return status; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * USB 2.0 spec Section 11.24.2.7 |
| 352 | */ |
| 353 | static int get_port_status(struct usb_device *hdev, int port1, |
| 354 | struct usb_port_status *data) |
| 355 | { |
| 356 | int i, status = -ETIMEDOUT; |
| 357 | |
| 358 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 359 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 360 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, |
| 361 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 362 | } |
| 363 | return status; |
| 364 | } |
| 365 | |
| 366 | static int hub_port_status(struct usb_hub *hub, int port1, |
| 367 | u16 *status, u16 *change) |
| 368 | { |
| 369 | int ret; |
| 370 | |
| 371 | mutex_lock(&hub->status_mutex); |
| 372 | ret = get_port_status(hub->hdev, port1, &hub->status->port); |
| 373 | if (ret < 4) { |
| 374 | dev_err(hub->intfdev, |
| 375 | "%s failed (err = %d)\n", __func__, ret); |
| 376 | if (ret >= 0) |
| 377 | ret = -EIO; |
| 378 | } else { |
| 379 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
| 380 | *change = le16_to_cpu(hub->status->port.wPortChange); |
| 381 | |
| 382 | ret = 0; |
| 383 | } |
| 384 | mutex_unlock(&hub->status_mutex); |
| 385 | return ret; |
| 386 | } |
| 387 | |
| 388 | static void kick_khubd(struct usb_hub *hub) |
| 389 | { |
| 390 | unsigned long flags; |
| 391 | |
| 392 | spin_lock_irqsave(&hub_event_lock, flags); |
| 393 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
| 394 | list_add_tail(&hub->event_list, &hub_event_list); |
| 395 | |
| 396 | /* Suppress autosuspend until khubd runs */ |
| 397 | usb_autopm_get_interface_no_resume( |
| 398 | to_usb_interface(hub->intfdev)); |
| 399 | wake_up(&khubd_wait); |
| 400 | } |
| 401 | spin_unlock_irqrestore(&hub_event_lock, flags); |
| 402 | } |
| 403 | |
| 404 | void usb_kick_khubd(struct usb_device *hdev) |
| 405 | { |
| 406 | struct usb_hub *hub = hdev_to_hub(hdev); |
| 407 | |
| 408 | if (hub) |
| 409 | kick_khubd(hub); |
| 410 | } |
| 411 | |
| 412 | |
| 413 | /* completion function, fires on port status changes and various faults */ |
| 414 | static void hub_irq(struct urb *urb) |
| 415 | { |
| 416 | struct usb_hub *hub = urb->context; |
| 417 | int status = urb->status; |
| 418 | unsigned i; |
| 419 | unsigned long bits; |
| 420 | |
| 421 | switch (status) { |
| 422 | case -ENOENT: /* synchronous unlink */ |
| 423 | case -ECONNRESET: /* async unlink */ |
| 424 | case -ESHUTDOWN: /* hardware going away */ |
| 425 | return; |
| 426 | |
| 427 | default: /* presumably an error */ |
| 428 | /* Cause a hub reset after 10 consecutive errors */ |
| 429 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
| 430 | if ((++hub->nerrors < 10) || hub->error) |
| 431 | goto resubmit; |
| 432 | hub->error = status; |
| 433 | /* FALL THROUGH */ |
| 434 | |
| 435 | /* let khubd handle things */ |
| 436 | case 0: /* we got data: port status changed */ |
| 437 | bits = 0; |
| 438 | for (i = 0; i < urb->actual_length; ++i) |
| 439 | bits |= ((unsigned long) ((*hub->buffer)[i])) |
| 440 | << (i*8); |
| 441 | hub->event_bits[0] = bits; |
| 442 | break; |
| 443 | } |
| 444 | |
| 445 | hub->nerrors = 0; |
| 446 | |
| 447 | /* Something happened, let khubd figure it out */ |
| 448 | kick_khubd(hub); |
| 449 | |
| 450 | resubmit: |
| 451 | if (hub->quiescing) |
| 452 | return; |
| 453 | |
| 454 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 |
| 455 | && status != -ENODEV && status != -EPERM) |
| 456 | dev_err (hub->intfdev, "resubmit --> %d\n", status); |
| 457 | } |
| 458 | |
| 459 | /* USB 2.0 spec Section 11.24.2.3 */ |
| 460 | static inline int |
| 461 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) |
| 462 | { |
| 463 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 464 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
| 465 | tt, NULL, 0, 1000); |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * enumeration blocks khubd for a long time. we use keventd instead, since |
| 470 | * long blocking there is the exception, not the rule. accordingly, HCDs |
| 471 | * talking to TTs must queue control transfers (not just bulk and iso), so |
| 472 | * both can talk to the same hub concurrently. |
| 473 | */ |
| 474 | static void hub_tt_work(struct work_struct *work) |
| 475 | { |
| 476 | struct usb_hub *hub = |
| 477 | container_of(work, struct usb_hub, tt.clear_work); |
| 478 | unsigned long flags; |
| 479 | int limit = 100; |
| 480 | |
| 481 | spin_lock_irqsave (&hub->tt.lock, flags); |
| 482 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
| 483 | struct list_head *next; |
| 484 | struct usb_tt_clear *clear; |
| 485 | struct usb_device *hdev = hub->hdev; |
| 486 | const struct hc_driver *drv; |
| 487 | int status; |
| 488 | |
| 489 | next = hub->tt.clear_list.next; |
| 490 | clear = list_entry (next, struct usb_tt_clear, clear_list); |
| 491 | list_del (&clear->clear_list); |
| 492 | |
| 493 | /* drop lock so HCD can concurrently report other TT errors */ |
| 494 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 495 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); |
| 496 | if (status) |
| 497 | dev_err (&hdev->dev, |
| 498 | "clear tt %d (%04x) error %d\n", |
| 499 | clear->tt, clear->devinfo, status); |
| 500 | |
| 501 | /* Tell the HCD, even if the operation failed */ |
| 502 | drv = clear->hcd->driver; |
| 503 | if (drv->clear_tt_buffer_complete) |
| 504 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); |
| 505 | |
| 506 | kfree(clear); |
| 507 | spin_lock_irqsave(&hub->tt.lock, flags); |
| 508 | } |
| 509 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
| 514 | * @urb: an URB associated with the failed or incomplete split transaction |
| 515 | * |
| 516 | * High speed HCDs use this to tell the hub driver that some split control or |
| 517 | * bulk transaction failed in a way that requires clearing internal state of |
| 518 | * a transaction translator. This is normally detected (and reported) from |
| 519 | * interrupt context. |
| 520 | * |
| 521 | * It may not be possible for that hub to handle additional full (or low) |
| 522 | * speed transactions until that state is fully cleared out. |
| 523 | */ |
| 524 | int usb_hub_clear_tt_buffer(struct urb *urb) |
| 525 | { |
| 526 | struct usb_device *udev = urb->dev; |
| 527 | int pipe = urb->pipe; |
| 528 | struct usb_tt *tt = udev->tt; |
| 529 | unsigned long flags; |
| 530 | struct usb_tt_clear *clear; |
| 531 | |
| 532 | /* we've got to cope with an arbitrary number of pending TT clears, |
| 533 | * since each TT has "at least two" buffers that can need it (and |
| 534 | * there can be many TTs per hub). even if they're uncommon. |
| 535 | */ |
| 536 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
| 537 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
| 538 | /* FIXME recover somehow ... RESET_TT? */ |
| 539 | return -ENOMEM; |
| 540 | } |
| 541 | |
| 542 | /* info that CLEAR_TT_BUFFER needs */ |
| 543 | clear->tt = tt->multi ? udev->ttport : 1; |
| 544 | clear->devinfo = usb_pipeendpoint (pipe); |
| 545 | clear->devinfo |= udev->devnum << 4; |
| 546 | clear->devinfo |= usb_pipecontrol (pipe) |
| 547 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
| 548 | : (USB_ENDPOINT_XFER_BULK << 11); |
| 549 | if (usb_pipein (pipe)) |
| 550 | clear->devinfo |= 1 << 15; |
| 551 | |
| 552 | /* info for completion callback */ |
| 553 | clear->hcd = bus_to_hcd(udev->bus); |
| 554 | clear->ep = urb->ep; |
| 555 | |
| 556 | /* tell keventd to clear state for this TT */ |
| 557 | spin_lock_irqsave (&tt->lock, flags); |
| 558 | list_add_tail (&clear->clear_list, &tt->clear_list); |
| 559 | schedule_work(&tt->clear_work); |
| 560 | spin_unlock_irqrestore (&tt->lock, flags); |
| 561 | return 0; |
| 562 | } |
| 563 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
| 564 | |
| 565 | /* If do_delay is false, return the number of milliseconds the caller |
| 566 | * needs to delay. |
| 567 | */ |
| 568 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) |
| 569 | { |
| 570 | int port1; |
| 571 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
| 572 | unsigned delay; |
| 573 | u16 wHubCharacteristics = |
| 574 | le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| 575 | |
| 576 | /* Enable power on each port. Some hubs have reserved values |
| 577 | * of LPSM (> 2) in their descriptors, even though they are |
| 578 | * USB 2.0 hubs. Some hubs do not implement port-power switching |
| 579 | * but only emulate it. In all cases, the ports won't work |
| 580 | * unless we send these messages to the hub. |
| 581 | */ |
| 582 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) |
| 583 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
| 584 | else |
| 585 | dev_dbg(hub->intfdev, "trying to enable port power on " |
| 586 | "non-switchable hub\n"); |
| 587 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) |
| 588 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
| 589 | |
| 590 | /* Wait at least 100 msec for power to become stable */ |
| 591 | delay = max(pgood_delay, (unsigned) 100); |
| 592 | if (do_delay) |
| 593 | msleep(delay); |
| 594 | return delay; |
| 595 | } |
| 596 | |
| 597 | static int hub_hub_status(struct usb_hub *hub, |
| 598 | u16 *status, u16 *change) |
| 599 | { |
| 600 | int ret; |
| 601 | |
| 602 | mutex_lock(&hub->status_mutex); |
| 603 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
| 604 | if (ret < 0) |
| 605 | dev_err (hub->intfdev, |
| 606 | "%s failed (err = %d)\n", __func__, ret); |
| 607 | else { |
| 608 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
| 609 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
| 610 | ret = 0; |
| 611 | } |
| 612 | mutex_unlock(&hub->status_mutex); |
| 613 | return ret; |
| 614 | } |
| 615 | |
| 616 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
| 617 | { |
| 618 | struct usb_device *hdev = hub->hdev; |
| 619 | int ret = 0; |
| 620 | |
| 621 | if (hdev->children[port1-1] && set_state) |
| 622 | usb_set_device_state(hdev->children[port1-1], |
| 623 | USB_STATE_NOTATTACHED); |
| 624 | if (!hub->error && !hub_is_superspeed(hub->hdev)) |
| 625 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); |
| 626 | if (ret) |
| 627 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", |
| 628 | port1, ret); |
| 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Disable a port and mark a logical connect-change event, so that some |
| 634 | * time later khubd will disconnect() any existing usb_device on the port |
| 635 | * and will re-enumerate if there actually is a device attached. |
| 636 | */ |
| 637 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
| 638 | { |
| 639 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); |
| 640 | hub_port_disable(hub, port1, 1); |
| 641 | |
| 642 | /* FIXME let caller ask to power down the port: |
| 643 | * - some devices won't enumerate without a VBUS power cycle |
| 644 | * - SRP saves power that way |
| 645 | * - ... new call, TBD ... |
| 646 | * That's easy if this hub can switch power per-port, and |
| 647 | * khubd reactivates the port later (timer, SRP, etc). |
| 648 | * Powerdown must be optional, because of reset/DFU. |
| 649 | */ |
| 650 | |
| 651 | set_bit(port1, hub->change_bits); |
| 652 | kick_khubd(hub); |
| 653 | } |
| 654 | |
| 655 | /** |
| 656 | * usb_remove_device - disable a device's port on its parent hub |
| 657 | * @udev: device to be disabled and removed |
| 658 | * Context: @udev locked, must be able to sleep. |
| 659 | * |
| 660 | * After @udev's port has been disabled, khubd is notified and it will |
| 661 | * see that the device has been disconnected. When the device is |
| 662 | * physically unplugged and something is plugged in, the events will |
| 663 | * be received and processed normally. |
| 664 | */ |
| 665 | int usb_remove_device(struct usb_device *udev) |
| 666 | { |
| 667 | struct usb_hub *hub; |
| 668 | struct usb_interface *intf; |
| 669 | |
| 670 | if (!udev->parent) /* Can't remove a root hub */ |
| 671 | return -EINVAL; |
| 672 | hub = hdev_to_hub(udev->parent); |
| 673 | intf = to_usb_interface(hub->intfdev); |
| 674 | |
| 675 | usb_autopm_get_interface(intf); |
| 676 | set_bit(udev->portnum, hub->removed_bits); |
| 677 | hub_port_logical_disconnect(hub, udev->portnum); |
| 678 | usb_autopm_put_interface(intf); |
| 679 | return 0; |
| 680 | } |
| 681 | |
| 682 | enum hub_activation_type { |
| 683 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
| 684 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
| 685 | }; |
| 686 | |
| 687 | static void hub_init_func2(struct work_struct *ws); |
| 688 | static void hub_init_func3(struct work_struct *ws); |
| 689 | |
| 690 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
| 691 | { |
| 692 | struct usb_device *hdev = hub->hdev; |
| 693 | struct usb_hcd *hcd; |
| 694 | int ret; |
| 695 | int port1; |
| 696 | int status; |
| 697 | bool need_debounce_delay = false; |
| 698 | unsigned delay; |
| 699 | |
| 700 | /* Continue a partial initialization */ |
| 701 | if (type == HUB_INIT2) |
| 702 | goto init2; |
| 703 | if (type == HUB_INIT3) |
| 704 | goto init3; |
| 705 | |
| 706 | /* After a resume, port power should still be on. |
| 707 | * For any other type of activation, turn it on. |
| 708 | */ |
| 709 | if (type != HUB_RESUME) { |
| 710 | |
| 711 | /* Speed up system boot by using a delayed_work for the |
| 712 | * hub's initial power-up delays. This is pretty awkward |
| 713 | * and the implementation looks like a home-brewed sort of |
| 714 | * setjmp/longjmp, but it saves at least 100 ms for each |
| 715 | * root hub (assuming usbcore is compiled into the kernel |
| 716 | * rather than as a module). It adds up. |
| 717 | * |
| 718 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME |
| 719 | * because for those activation types the ports have to be |
| 720 | * operational when we return. In theory this could be done |
| 721 | * for HUB_POST_RESET, but it's easier not to. |
| 722 | */ |
| 723 | if (type == HUB_INIT) { |
| 724 | delay = hub_power_on(hub, false); |
| 725 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); |
| 726 | schedule_delayed_work(&hub->init_work, |
| 727 | msecs_to_jiffies(delay)); |
| 728 | |
| 729 | /* Suppress autosuspend until init is done */ |
| 730 | usb_autopm_get_interface_no_resume( |
| 731 | to_usb_interface(hub->intfdev)); |
| 732 | return; /* Continues at init2: below */ |
| 733 | } else if (type == HUB_RESET_RESUME) { |
| 734 | /* The internal host controller state for the hub device |
| 735 | * may be gone after a host power loss on system resume. |
| 736 | * Update the device's info so the HW knows it's a hub. |
| 737 | */ |
| 738 | hcd = bus_to_hcd(hdev->bus); |
| 739 | if (hcd->driver->update_hub_device) { |
| 740 | ret = hcd->driver->update_hub_device(hcd, hdev, |
| 741 | &hub->tt, GFP_NOIO); |
| 742 | if (ret < 0) { |
| 743 | dev_err(hub->intfdev, "Host not " |
| 744 | "accepting hub info " |
| 745 | "update.\n"); |
| 746 | dev_err(hub->intfdev, "LS/FS devices " |
| 747 | "and hubs may not work " |
| 748 | "under this hub\n."); |
| 749 | } |
| 750 | } |
| 751 | hub_power_on(hub, true); |
| 752 | } else { |
| 753 | hub_power_on(hub, true); |
| 754 | } |
| 755 | } |
| 756 | init2: |
| 757 | |
| 758 | /* Check each port and set hub->change_bits to let khubd know |
| 759 | * which ports need attention. |
| 760 | */ |
| 761 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 762 | struct usb_device *udev = hdev->children[port1-1]; |
| 763 | u16 portstatus, portchange; |
| 764 | |
| 765 | portstatus = portchange = 0; |
| 766 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 767 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
| 768 | dev_dbg(hub->intfdev, |
| 769 | "port %d: status %04x change %04x\n", |
| 770 | port1, portstatus, portchange); |
| 771 | |
| 772 | /* After anything other than HUB_RESUME (i.e., initialization |
| 773 | * or any sort of reset), every port should be disabled. |
| 774 | * Unconnected ports should likewise be disabled (paranoia), |
| 775 | * and so should ports for which we have no usb_device. |
| 776 | */ |
| 777 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( |
| 778 | type != HUB_RESUME || |
| 779 | !(portstatus & USB_PORT_STAT_CONNECTION) || |
| 780 | !udev || |
| 781 | udev->state == USB_STATE_NOTATTACHED)) { |
| 782 | /* |
| 783 | * USB3 protocol ports will automatically transition |
| 784 | * to Enabled state when detect an USB3.0 device attach. |
| 785 | * Do not disable USB3 protocol ports. |
| 786 | */ |
| 787 | if (!hub_is_superspeed(hdev)) { |
| 788 | clear_port_feature(hdev, port1, |
| 789 | USB_PORT_FEAT_ENABLE); |
| 790 | portstatus &= ~USB_PORT_STAT_ENABLE; |
| 791 | } else { |
| 792 | /* Pretend that power was lost for USB3 devs */ |
| 793 | portstatus &= ~USB_PORT_STAT_ENABLE; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | /* Clear status-change flags; we'll debounce later */ |
| 798 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 799 | need_debounce_delay = true; |
| 800 | clear_port_feature(hub->hdev, port1, |
| 801 | USB_PORT_FEAT_C_CONNECTION); |
| 802 | } |
| 803 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 804 | need_debounce_delay = true; |
| 805 | clear_port_feature(hub->hdev, port1, |
| 806 | USB_PORT_FEAT_C_ENABLE); |
| 807 | } |
| 808 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
| 809 | need_debounce_delay = true; |
| 810 | clear_port_feature(hub->hdev, port1, |
| 811 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
| 812 | } |
| 813 | |
| 814 | /* We can forget about a "removed" device when there's a |
| 815 | * physical disconnect or the connect status changes. |
| 816 | */ |
| 817 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 818 | (portchange & USB_PORT_STAT_C_CONNECTION)) |
| 819 | clear_bit(port1, hub->removed_bits); |
| 820 | |
| 821 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
| 822 | /* Tell khubd to disconnect the device or |
| 823 | * check for a new connection |
| 824 | */ |
| 825 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
| 826 | set_bit(port1, hub->change_bits); |
| 827 | |
| 828 | } else if (portstatus & USB_PORT_STAT_ENABLE) { |
| 829 | /* The power session apparently survived the resume. |
| 830 | * If there was an overcurrent or suspend change |
| 831 | * (i.e., remote wakeup request), have khubd |
| 832 | * take care of it. |
| 833 | */ |
| 834 | if (portchange) |
| 835 | set_bit(port1, hub->change_bits); |
| 836 | |
| 837 | } else if (udev->persist_enabled) { |
| 838 | #ifdef CONFIG_PM |
| 839 | udev->reset_resume = 1; |
| 840 | #endif |
| 841 | set_bit(port1, hub->change_bits); |
| 842 | |
| 843 | } else { |
| 844 | /* The power session is gone; tell khubd */ |
| 845 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 846 | set_bit(port1, hub->change_bits); |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | /* If no port-status-change flags were set, we don't need any |
| 851 | * debouncing. If flags were set we can try to debounce the |
| 852 | * ports all at once right now, instead of letting khubd do them |
| 853 | * one at a time later on. |
| 854 | * |
| 855 | * If any port-status changes do occur during this delay, khubd |
| 856 | * will see them later and handle them normally. |
| 857 | */ |
| 858 | if (need_debounce_delay) { |
| 859 | delay = HUB_DEBOUNCE_STABLE; |
| 860 | |
| 861 | /* Don't do a long sleep inside a workqueue routine */ |
| 862 | if (type == HUB_INIT2) { |
| 863 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); |
| 864 | schedule_delayed_work(&hub->init_work, |
| 865 | msecs_to_jiffies(delay)); |
| 866 | return; /* Continues at init3: below */ |
| 867 | } else { |
| 868 | msleep(delay); |
| 869 | } |
| 870 | } |
| 871 | init3: |
| 872 | hub->quiescing = 0; |
| 873 | |
| 874 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
| 875 | if (status < 0) |
| 876 | dev_err(hub->intfdev, "activate --> %d\n", status); |
| 877 | if (hub->has_indicators && blinkenlights) |
| 878 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 879 | |
| 880 | /* Scan all ports that need attention */ |
| 881 | kick_khubd(hub); |
| 882 | |
| 883 | /* Allow autosuspend if it was suppressed */ |
| 884 | if (type <= HUB_INIT3) |
| 885 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
| 886 | } |
| 887 | |
| 888 | /* Implement the continuations for the delays above */ |
| 889 | static void hub_init_func2(struct work_struct *ws) |
| 890 | { |
| 891 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 892 | |
| 893 | hub_activate(hub, HUB_INIT2); |
| 894 | } |
| 895 | |
| 896 | static void hub_init_func3(struct work_struct *ws) |
| 897 | { |
| 898 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 899 | |
| 900 | hub_activate(hub, HUB_INIT3); |
| 901 | } |
| 902 | |
| 903 | enum hub_quiescing_type { |
| 904 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND |
| 905 | }; |
| 906 | |
| 907 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) |
| 908 | { |
| 909 | struct usb_device *hdev = hub->hdev; |
| 910 | int i; |
| 911 | |
| 912 | cancel_delayed_work_sync(&hub->init_work); |
| 913 | |
| 914 | /* khubd and related activity won't re-trigger */ |
| 915 | hub->quiescing = 1; |
| 916 | |
| 917 | if (type != HUB_SUSPEND) { |
| 918 | /* Disconnect all the children */ |
| 919 | for (i = 0; i < hdev->maxchild; ++i) { |
| 920 | if (hdev->children[i]) |
| 921 | usb_disconnect(&hdev->children[i]); |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | /* Stop khubd and related activity */ |
| 926 | usb_kill_urb(hub->urb); |
| 927 | if (hub->has_indicators) |
| 928 | cancel_delayed_work_sync(&hub->leds); |
| 929 | if (hub->tt.hub) |
| 930 | cancel_work_sync(&hub->tt.clear_work); |
| 931 | } |
| 932 | |
| 933 | /* caller has locked the hub device */ |
| 934 | static int hub_pre_reset(struct usb_interface *intf) |
| 935 | { |
| 936 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 937 | |
| 938 | hub_quiesce(hub, HUB_PRE_RESET); |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | /* caller has locked the hub device */ |
| 943 | static int hub_post_reset(struct usb_interface *intf) |
| 944 | { |
| 945 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 946 | |
| 947 | hub_activate(hub, HUB_POST_RESET); |
| 948 | return 0; |
| 949 | } |
| 950 | |
| 951 | static int hub_configure(struct usb_hub *hub, |
| 952 | struct usb_endpoint_descriptor *endpoint) |
| 953 | { |
| 954 | struct usb_hcd *hcd; |
| 955 | struct usb_device *hdev = hub->hdev; |
| 956 | struct device *hub_dev = hub->intfdev; |
| 957 | u16 hubstatus, hubchange; |
| 958 | u16 wHubCharacteristics; |
| 959 | unsigned int pipe; |
| 960 | int maxp, ret; |
| 961 | char *message = "out of memory"; |
| 962 | |
| 963 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
| 964 | if (!hub->buffer) { |
| 965 | ret = -ENOMEM; |
| 966 | goto fail; |
| 967 | } |
| 968 | |
| 969 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
| 970 | if (!hub->status) { |
| 971 | ret = -ENOMEM; |
| 972 | goto fail; |
| 973 | } |
| 974 | mutex_init(&hub->status_mutex); |
| 975 | |
| 976 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
| 977 | if (!hub->descriptor) { |
| 978 | ret = -ENOMEM; |
| 979 | goto fail; |
| 980 | } |
| 981 | |
| 982 | if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) { |
| 983 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 984 | HUB_SET_DEPTH, USB_RT_HUB, |
| 985 | hdev->level - 1, 0, NULL, 0, |
| 986 | USB_CTRL_SET_TIMEOUT); |
| 987 | |
| 988 | if (ret < 0) { |
| 989 | message = "can't set hub depth"; |
| 990 | goto fail; |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | /* Request the entire hub descriptor. |
| 995 | * hub->descriptor can handle USB_MAXCHILDREN ports, |
| 996 | * but the hub can/will return fewer bytes here. |
| 997 | */ |
| 998 | ret = get_hub_descriptor(hdev, hub->descriptor); |
| 999 | if (ret < 0) { |
| 1000 | message = "can't read hub descriptor"; |
| 1001 | goto fail; |
| 1002 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { |
| 1003 | message = "hub has too many ports!"; |
| 1004 | ret = -ENODEV; |
| 1005 | goto fail; |
| 1006 | } |
| 1007 | |
| 1008 | hdev->maxchild = hub->descriptor->bNbrPorts; |
| 1009 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, |
| 1010 | (hdev->maxchild == 1) ? "" : "s"); |
| 1011 | |
| 1012 | hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); |
| 1013 | if (!hub->port_owners) { |
| 1014 | ret = -ENOMEM; |
| 1015 | goto fail; |
| 1016 | } |
| 1017 | |
| 1018 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| 1019 | |
| 1020 | /* FIXME for USB 3.0, skip for now */ |
| 1021 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && |
| 1022 | !(hub_is_superspeed(hdev))) { |
| 1023 | int i; |
| 1024 | char portstr [USB_MAXCHILDREN + 1]; |
| 1025 | |
| 1026 | for (i = 0; i < hdev->maxchild; i++) |
| 1027 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
| 1028 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
| 1029 | ? 'F' : 'R'; |
| 1030 | portstr[hdev->maxchild] = 0; |
| 1031 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
| 1032 | } else |
| 1033 | dev_dbg(hub_dev, "standalone hub\n"); |
| 1034 | |
| 1035 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
| 1036 | case 0x00: |
| 1037 | dev_dbg(hub_dev, "ganged power switching\n"); |
| 1038 | break; |
| 1039 | case 0x01: |
| 1040 | dev_dbg(hub_dev, "individual port power switching\n"); |
| 1041 | break; |
| 1042 | case 0x02: |
| 1043 | case 0x03: |
| 1044 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
| 1045 | break; |
| 1046 | } |
| 1047 | |
| 1048 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
| 1049 | case 0x00: |
| 1050 | dev_dbg(hub_dev, "global over-current protection\n"); |
| 1051 | break; |
| 1052 | case 0x08: |
| 1053 | dev_dbg(hub_dev, "individual port over-current protection\n"); |
| 1054 | break; |
| 1055 | case 0x10: |
| 1056 | case 0x18: |
| 1057 | dev_dbg(hub_dev, "no over-current protection\n"); |
| 1058 | break; |
| 1059 | } |
| 1060 | |
| 1061 | spin_lock_init (&hub->tt.lock); |
| 1062 | INIT_LIST_HEAD (&hub->tt.clear_list); |
| 1063 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
| 1064 | switch (hdev->descriptor.bDeviceProtocol) { |
| 1065 | case 0: |
| 1066 | break; |
| 1067 | case 1: |
| 1068 | dev_dbg(hub_dev, "Single TT\n"); |
| 1069 | hub->tt.hub = hdev; |
| 1070 | break; |
| 1071 | case 2: |
| 1072 | ret = usb_set_interface(hdev, 0, 1); |
| 1073 | if (ret == 0) { |
| 1074 | dev_dbg(hub_dev, "TT per port\n"); |
| 1075 | hub->tt.multi = 1; |
| 1076 | } else |
| 1077 | dev_err(hub_dev, "Using single TT (err %d)\n", |
| 1078 | ret); |
| 1079 | hub->tt.hub = hdev; |
| 1080 | break; |
| 1081 | case 3: |
| 1082 | /* USB 3.0 hubs don't have a TT */ |
| 1083 | break; |
| 1084 | default: |
| 1085 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
| 1086 | hdev->descriptor.bDeviceProtocol); |
| 1087 | break; |
| 1088 | } |
| 1089 | |
| 1090 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
| 1091 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
| 1092 | case HUB_TTTT_8_BITS: |
| 1093 | if (hdev->descriptor.bDeviceProtocol != 0) { |
| 1094 | hub->tt.think_time = 666; |
| 1095 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1096 | "FS bit times (%d ns)\n", |
| 1097 | 8, hub->tt.think_time); |
| 1098 | } |
| 1099 | break; |
| 1100 | case HUB_TTTT_16_BITS: |
| 1101 | hub->tt.think_time = 666 * 2; |
| 1102 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1103 | "FS bit times (%d ns)\n", |
| 1104 | 16, hub->tt.think_time); |
| 1105 | break; |
| 1106 | case HUB_TTTT_24_BITS: |
| 1107 | hub->tt.think_time = 666 * 3; |
| 1108 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1109 | "FS bit times (%d ns)\n", |
| 1110 | 24, hub->tt.think_time); |
| 1111 | break; |
| 1112 | case HUB_TTTT_32_BITS: |
| 1113 | hub->tt.think_time = 666 * 4; |
| 1114 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1115 | "FS bit times (%d ns)\n", |
| 1116 | 32, hub->tt.think_time); |
| 1117 | break; |
| 1118 | } |
| 1119 | |
| 1120 | /* probe() zeroes hub->indicator[] */ |
| 1121 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
| 1122 | hub->has_indicators = 1; |
| 1123 | dev_dbg(hub_dev, "Port indicators are supported\n"); |
| 1124 | } |
| 1125 | |
| 1126 | dev_dbg(hub_dev, "power on to power good time: %dms\n", |
| 1127 | hub->descriptor->bPwrOn2PwrGood * 2); |
| 1128 | |
| 1129 | /* power budgeting mostly matters with bus-powered hubs, |
| 1130 | * and battery-powered root hubs (may provide just 8 mA). |
| 1131 | */ |
| 1132 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
| 1133 | if (ret < 2) { |
| 1134 | message = "can't get hub status"; |
| 1135 | goto fail; |
| 1136 | } |
| 1137 | le16_to_cpus(&hubstatus); |
| 1138 | if (hdev == hdev->bus->root_hub) { |
| 1139 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
| 1140 | hub->mA_per_port = 500; |
| 1141 | else { |
| 1142 | hub->mA_per_port = hdev->bus_mA; |
| 1143 | hub->limited_power = 1; |
| 1144 | } |
| 1145 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| 1146 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
| 1147 | hub->descriptor->bHubContrCurrent); |
| 1148 | hub->limited_power = 1; |
| 1149 | if (hdev->maxchild > 0) { |
| 1150 | int remaining = hdev->bus_mA - |
| 1151 | hub->descriptor->bHubContrCurrent; |
| 1152 | |
| 1153 | if (remaining < hdev->maxchild * 100) |
| 1154 | dev_warn(hub_dev, |
| 1155 | "insufficient power available " |
| 1156 | "to use all downstream ports\n"); |
| 1157 | hub->mA_per_port = 100; /* 7.2.1.1 */ |
| 1158 | } |
| 1159 | } else { /* Self-powered external hub */ |
| 1160 | /* FIXME: What about battery-powered external hubs that |
| 1161 | * provide less current per port? */ |
| 1162 | hub->mA_per_port = 500; |
| 1163 | } |
| 1164 | if (hub->mA_per_port < 500) |
| 1165 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
| 1166 | hub->mA_per_port); |
| 1167 | |
| 1168 | /* Update the HCD's internal representation of this hub before khubd |
| 1169 | * starts getting port status changes for devices under the hub. |
| 1170 | */ |
| 1171 | hcd = bus_to_hcd(hdev->bus); |
| 1172 | if (hcd->driver->update_hub_device) { |
| 1173 | ret = hcd->driver->update_hub_device(hcd, hdev, |
| 1174 | &hub->tt, GFP_KERNEL); |
| 1175 | if (ret < 0) { |
| 1176 | message = "can't update HCD hub info"; |
| 1177 | goto fail; |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
| 1182 | if (ret < 0) { |
| 1183 | message = "can't get hub status"; |
| 1184 | goto fail; |
| 1185 | } |
| 1186 | |
| 1187 | /* local power status reports aren't always correct */ |
| 1188 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
| 1189 | dev_dbg(hub_dev, "local power source is %s\n", |
| 1190 | (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 1191 | ? "lost (inactive)" : "good"); |
| 1192 | |
| 1193 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
| 1194 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
| 1195 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
| 1196 | |
| 1197 | /* set up the interrupt endpoint |
| 1198 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 |
| 1199 | * bytes as USB2.0[11.12.3] says because some hubs are known |
| 1200 | * to send more data (and thus cause overflow). For root hubs, |
| 1201 | * maxpktsize is defined in hcd.c's fake endpoint descriptors |
| 1202 | * to be big enough for at least USB_MAXCHILDREN ports. */ |
| 1203 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
| 1204 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
| 1205 | |
| 1206 | if (maxp > sizeof(*hub->buffer)) |
| 1207 | maxp = sizeof(*hub->buffer); |
| 1208 | |
| 1209 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
| 1210 | if (!hub->urb) { |
| 1211 | ret = -ENOMEM; |
| 1212 | goto fail; |
| 1213 | } |
| 1214 | |
| 1215 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
| 1216 | hub, endpoint->bInterval); |
| 1217 | |
| 1218 | /* maybe cycle the hub leds */ |
| 1219 | if (hub->has_indicators && blinkenlights) |
| 1220 | hub->indicator [0] = INDICATOR_CYCLE; |
| 1221 | |
| 1222 | hub_activate(hub, HUB_INIT); |
| 1223 | return 0; |
| 1224 | |
| 1225 | fail: |
| 1226 | dev_err (hub_dev, "config failed, %s (err %d)\n", |
| 1227 | message, ret); |
| 1228 | /* hub_disconnect() frees urb and descriptor */ |
| 1229 | return ret; |
| 1230 | } |
| 1231 | |
| 1232 | static void hub_release(struct kref *kref) |
| 1233 | { |
| 1234 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); |
| 1235 | |
| 1236 | usb_put_intf(to_usb_interface(hub->intfdev)); |
| 1237 | kfree(hub); |
| 1238 | } |
| 1239 | |
| 1240 | static unsigned highspeed_hubs; |
| 1241 | |
| 1242 | static void hub_disconnect(struct usb_interface *intf) |
| 1243 | { |
| 1244 | struct usb_hub *hub = usb_get_intfdata (intf); |
| 1245 | |
| 1246 | /* Take the hub off the event list and don't let it be added again */ |
| 1247 | spin_lock_irq(&hub_event_lock); |
| 1248 | if (!list_empty(&hub->event_list)) { |
| 1249 | list_del_init(&hub->event_list); |
| 1250 | usb_autopm_put_interface_no_suspend(intf); |
| 1251 | } |
| 1252 | hub->disconnected = 1; |
| 1253 | spin_unlock_irq(&hub_event_lock); |
| 1254 | |
| 1255 | /* Disconnect all children and quiesce the hub */ |
| 1256 | hub->error = 0; |
| 1257 | hub_quiesce(hub, HUB_DISCONNECT); |
| 1258 | |
| 1259 | usb_set_intfdata (intf, NULL); |
| 1260 | hub->hdev->maxchild = 0; |
| 1261 | |
| 1262 | if (hub->hdev->speed == USB_SPEED_HIGH) |
| 1263 | highspeed_hubs--; |
| 1264 | |
| 1265 | usb_free_urb(hub->urb); |
| 1266 | kfree(hub->port_owners); |
| 1267 | kfree(hub->descriptor); |
| 1268 | kfree(hub->status); |
| 1269 | kfree(hub->buffer); |
| 1270 | |
| 1271 | kref_put(&hub->kref, hub_release); |
| 1272 | } |
| 1273 | |
| 1274 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| 1275 | { |
| 1276 | struct usb_host_interface *desc; |
| 1277 | struct usb_endpoint_descriptor *endpoint; |
| 1278 | struct usb_device *hdev; |
| 1279 | struct usb_hub *hub; |
| 1280 | |
| 1281 | desc = intf->cur_altsetting; |
| 1282 | hdev = interface_to_usbdev(intf); |
| 1283 | |
| 1284 | /* Hubs have proper suspend/resume support. USB 3.0 device suspend is |
| 1285 | * different from USB 2.0/1.1 device suspend, and unfortunately we |
| 1286 | * don't support it yet. So leave autosuspend disabled for USB 3.0 |
| 1287 | * external hubs for now. Enable autosuspend for USB 3.0 roothubs, |
| 1288 | * since that isn't a "real" hub. |
| 1289 | */ |
| 1290 | if (!hub_is_superspeed(hdev) || !hdev->parent) |
| 1291 | usb_enable_autosuspend(hdev); |
| 1292 | |
| 1293 | if (hdev->level == MAX_TOPO_LEVEL) { |
| 1294 | dev_err(&intf->dev, |
| 1295 | "Unsupported bus topology: hub nested too deep\n"); |
| 1296 | return -E2BIG; |
| 1297 | } |
| 1298 | |
| 1299 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
| 1300 | if (hdev->parent) { |
| 1301 | dev_warn(&intf->dev, "ignoring external hub\n"); |
| 1302 | return -ENODEV; |
| 1303 | } |
| 1304 | #endif |
| 1305 | |
| 1306 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
| 1307 | /* specs is not defined, but it works */ |
| 1308 | if ((desc->desc.bInterfaceSubClass != 0) && |
| 1309 | (desc->desc.bInterfaceSubClass != 1)) { |
| 1310 | descriptor_error: |
| 1311 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); |
| 1312 | return -EIO; |
| 1313 | } |
| 1314 | |
| 1315 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
| 1316 | if (desc->desc.bNumEndpoints != 1) |
| 1317 | goto descriptor_error; |
| 1318 | |
| 1319 | endpoint = &desc->endpoint[0].desc; |
| 1320 | |
| 1321 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
| 1322 | if (!usb_endpoint_is_int_in(endpoint)) |
| 1323 | goto descriptor_error; |
| 1324 | |
| 1325 | /* We found a hub */ |
| 1326 | dev_info (&intf->dev, "USB hub found\n"); |
| 1327 | |
| 1328 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
| 1329 | if (!hub) { |
| 1330 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); |
| 1331 | return -ENOMEM; |
| 1332 | } |
| 1333 | |
| 1334 | kref_init(&hub->kref); |
| 1335 | INIT_LIST_HEAD(&hub->event_list); |
| 1336 | hub->intfdev = &intf->dev; |
| 1337 | hub->hdev = hdev; |
| 1338 | INIT_DELAYED_WORK(&hub->leds, led_work); |
| 1339 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
| 1340 | usb_get_intf(intf); |
| 1341 | |
| 1342 | usb_set_intfdata (intf, hub); |
| 1343 | intf->needs_remote_wakeup = 1; |
| 1344 | |
| 1345 | if (hdev->speed == USB_SPEED_HIGH) |
| 1346 | highspeed_hubs++; |
| 1347 | |
| 1348 | if (hub_configure(hub, endpoint) >= 0) |
| 1349 | return 0; |
| 1350 | |
| 1351 | hub_disconnect (intf); |
| 1352 | return -ENODEV; |
| 1353 | } |
| 1354 | |
| 1355 | /* No BKL needed */ |
| 1356 | static int |
| 1357 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
| 1358 | { |
| 1359 | struct usb_device *hdev = interface_to_usbdev (intf); |
| 1360 | |
| 1361 | /* assert ifno == 0 (part of hub spec) */ |
| 1362 | switch (code) { |
| 1363 | case USBDEVFS_HUB_PORTINFO: { |
| 1364 | struct usbdevfs_hub_portinfo *info = user_data; |
| 1365 | int i; |
| 1366 | |
| 1367 | spin_lock_irq(&device_state_lock); |
| 1368 | if (hdev->devnum <= 0) |
| 1369 | info->nports = 0; |
| 1370 | else { |
| 1371 | info->nports = hdev->maxchild; |
| 1372 | for (i = 0; i < info->nports; i++) { |
| 1373 | if (hdev->children[i] == NULL) |
| 1374 | info->port[i] = 0; |
| 1375 | else |
| 1376 | info->port[i] = |
| 1377 | hdev->children[i]->devnum; |
| 1378 | } |
| 1379 | } |
| 1380 | spin_unlock_irq(&device_state_lock); |
| 1381 | |
| 1382 | return info->nports + 1; |
| 1383 | } |
| 1384 | |
| 1385 | default: |
| 1386 | return -ENOSYS; |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Allow user programs to claim ports on a hub. When a device is attached |
| 1392 | * to one of these "claimed" ports, the program will "own" the device. |
| 1393 | */ |
| 1394 | static int find_port_owner(struct usb_device *hdev, unsigned port1, |
| 1395 | void ***ppowner) |
| 1396 | { |
| 1397 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 1398 | return -ENODEV; |
| 1399 | if (port1 == 0 || port1 > hdev->maxchild) |
| 1400 | return -EINVAL; |
| 1401 | |
| 1402 | /* This assumes that devices not managed by the hub driver |
| 1403 | * will always have maxchild equal to 0. |
| 1404 | */ |
| 1405 | *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); |
| 1406 | return 0; |
| 1407 | } |
| 1408 | |
| 1409 | /* In the following three functions, the caller must hold hdev's lock */ |
| 1410 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) |
| 1411 | { |
| 1412 | int rc; |
| 1413 | void **powner; |
| 1414 | |
| 1415 | rc = find_port_owner(hdev, port1, &powner); |
| 1416 | if (rc) |
| 1417 | return rc; |
| 1418 | if (*powner) |
| 1419 | return -EBUSY; |
| 1420 | *powner = owner; |
| 1421 | return rc; |
| 1422 | } |
| 1423 | |
| 1424 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) |
| 1425 | { |
| 1426 | int rc; |
| 1427 | void **powner; |
| 1428 | |
| 1429 | rc = find_port_owner(hdev, port1, &powner); |
| 1430 | if (rc) |
| 1431 | return rc; |
| 1432 | if (*powner != owner) |
| 1433 | return -ENOENT; |
| 1434 | *powner = NULL; |
| 1435 | return rc; |
| 1436 | } |
| 1437 | |
| 1438 | void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) |
| 1439 | { |
| 1440 | int n; |
| 1441 | void **powner; |
| 1442 | |
| 1443 | n = find_port_owner(hdev, 1, &powner); |
| 1444 | if (n == 0) { |
| 1445 | for (; n < hdev->maxchild; (++n, ++powner)) { |
| 1446 | if (*powner == owner) |
| 1447 | *powner = NULL; |
| 1448 | } |
| 1449 | } |
| 1450 | } |
| 1451 | |
| 1452 | /* The caller must hold udev's lock */ |
| 1453 | bool usb_device_is_owned(struct usb_device *udev) |
| 1454 | { |
| 1455 | struct usb_hub *hub; |
| 1456 | |
| 1457 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) |
| 1458 | return false; |
| 1459 | hub = hdev_to_hub(udev->parent); |
| 1460 | return !!hub->port_owners[udev->portnum - 1]; |
| 1461 | } |
| 1462 | |
| 1463 | |
| 1464 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
| 1465 | { |
| 1466 | int i; |
| 1467 | |
| 1468 | for (i = 0; i < udev->maxchild; ++i) { |
| 1469 | if (udev->children[i]) |
| 1470 | recursively_mark_NOTATTACHED(udev->children[i]); |
| 1471 | } |
| 1472 | if (udev->state == USB_STATE_SUSPENDED) |
| 1473 | udev->active_duration -= jiffies; |
| 1474 | udev->state = USB_STATE_NOTATTACHED; |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * usb_set_device_state - change a device's current state (usbcore, hcds) |
| 1479 | * @udev: pointer to device whose state should be changed |
| 1480 | * @new_state: new state value to be stored |
| 1481 | * |
| 1482 | * udev->state is _not_ fully protected by the device lock. Although |
| 1483 | * most transitions are made only while holding the lock, the state can |
| 1484 | * can change to USB_STATE_NOTATTACHED at almost any time. This |
| 1485 | * is so that devices can be marked as disconnected as soon as possible, |
| 1486 | * without having to wait for any semaphores to be released. As a result, |
| 1487 | * all changes to any device's state must be protected by the |
| 1488 | * device_state_lock spinlock. |
| 1489 | * |
| 1490 | * Once a device has been added to the device tree, all changes to its state |
| 1491 | * should be made using this routine. The state should _not_ be set directly. |
| 1492 | * |
| 1493 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
| 1494 | * Otherwise udev->state is set to new_state, and if new_state is |
| 1495 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
| 1496 | * to USB_STATE_NOTATTACHED. |
| 1497 | */ |
| 1498 | void usb_set_device_state(struct usb_device *udev, |
| 1499 | enum usb_device_state new_state) |
| 1500 | { |
| 1501 | unsigned long flags; |
| 1502 | int wakeup = -1; |
| 1503 | |
| 1504 | spin_lock_irqsave(&device_state_lock, flags); |
| 1505 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1506 | ; /* do nothing */ |
| 1507 | else if (new_state != USB_STATE_NOTATTACHED) { |
| 1508 | |
| 1509 | /* root hub wakeup capabilities are managed out-of-band |
| 1510 | * and may involve silicon errata ... ignore them here. |
| 1511 | */ |
| 1512 | if (udev->parent) { |
| 1513 | if (udev->state == USB_STATE_SUSPENDED |
| 1514 | || new_state == USB_STATE_SUSPENDED) |
| 1515 | ; /* No change to wakeup settings */ |
| 1516 | else if (new_state == USB_STATE_CONFIGURED) |
| 1517 | wakeup = udev->actconfig->desc.bmAttributes |
| 1518 | & USB_CONFIG_ATT_WAKEUP; |
| 1519 | else |
| 1520 | wakeup = 0; |
| 1521 | } |
| 1522 | if (udev->state == USB_STATE_SUSPENDED && |
| 1523 | new_state != USB_STATE_SUSPENDED) |
| 1524 | udev->active_duration -= jiffies; |
| 1525 | else if (new_state == USB_STATE_SUSPENDED && |
| 1526 | udev->state != USB_STATE_SUSPENDED) |
| 1527 | udev->active_duration += jiffies; |
| 1528 | udev->state = new_state; |
| 1529 | } else |
| 1530 | recursively_mark_NOTATTACHED(udev); |
| 1531 | spin_unlock_irqrestore(&device_state_lock, flags); |
| 1532 | if (wakeup >= 0) |
| 1533 | device_set_wakeup_capable(&udev->dev, wakeup); |
| 1534 | } |
| 1535 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
| 1536 | |
| 1537 | /* |
| 1538 | * Choose a device number. |
| 1539 | * |
| 1540 | * Device numbers are used as filenames in usbfs. On USB-1.1 and |
| 1541 | * USB-2.0 buses they are also used as device addresses, however on |
| 1542 | * USB-3.0 buses the address is assigned by the controller hardware |
| 1543 | * and it usually is not the same as the device number. |
| 1544 | * |
| 1545 | * WUSB devices are simple: they have no hubs behind, so the mapping |
| 1546 | * device <-> virtual port number becomes 1:1. Why? to simplify the |
| 1547 | * life of the device connection logic in |
| 1548 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret |
| 1549 | * handshake we need to assign a temporary address in the unauthorized |
| 1550 | * space. For simplicity we use the first virtual port number found to |
| 1551 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] |
| 1552 | * and that becomes it's address [X < 128] or its unauthorized address |
| 1553 | * [X | 0x80]. |
| 1554 | * |
| 1555 | * We add 1 as an offset to the one-based USB-stack port number |
| 1556 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr |
| 1557 | * 0 is reserved by USB for default address; (b) Linux's USB stack |
| 1558 | * uses always #1 for the root hub of the controller. So USB stack's |
| 1559 | * port #1, which is wusb virtual-port #0 has address #2. |
| 1560 | * |
| 1561 | * Devices connected under xHCI are not as simple. The host controller |
| 1562 | * supports virtualization, so the hardware assigns device addresses and |
| 1563 | * the HCD must setup data structures before issuing a set address |
| 1564 | * command to the hardware. |
| 1565 | */ |
| 1566 | static void choose_devnum(struct usb_device *udev) |
| 1567 | { |
| 1568 | int devnum; |
| 1569 | struct usb_bus *bus = udev->bus; |
| 1570 | |
| 1571 | /* If khubd ever becomes multithreaded, this will need a lock */ |
| 1572 | if (udev->wusb) { |
| 1573 | devnum = udev->portnum + 1; |
| 1574 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); |
| 1575 | } else { |
| 1576 | /* Try to allocate the next devnum beginning at |
| 1577 | * bus->devnum_next. */ |
| 1578 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
| 1579 | bus->devnum_next); |
| 1580 | if (devnum >= 128) |
| 1581 | devnum = find_next_zero_bit(bus->devmap.devicemap, |
| 1582 | 128, 1); |
| 1583 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); |
| 1584 | } |
| 1585 | if (devnum < 128) { |
| 1586 | set_bit(devnum, bus->devmap.devicemap); |
| 1587 | udev->devnum = devnum; |
| 1588 | } |
| 1589 | } |
| 1590 | |
| 1591 | static void release_devnum(struct usb_device *udev) |
| 1592 | { |
| 1593 | if (udev->devnum > 0) { |
| 1594 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
| 1595 | udev->devnum = -1; |
| 1596 | } |
| 1597 | } |
| 1598 | |
| 1599 | static void update_devnum(struct usb_device *udev, int devnum) |
| 1600 | { |
| 1601 | /* The address for a WUSB device is managed by wusbcore. */ |
| 1602 | if (!udev->wusb) |
| 1603 | udev->devnum = devnum; |
| 1604 | } |
| 1605 | |
| 1606 | static void hub_free_dev(struct usb_device *udev) |
| 1607 | { |
| 1608 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 1609 | |
| 1610 | /* Root hubs aren't real devices, so don't free HCD resources */ |
| 1611 | if (hcd->driver->free_dev && udev->parent) |
| 1612 | hcd->driver->free_dev(hcd, udev); |
| 1613 | } |
| 1614 | |
| 1615 | /** |
| 1616 | * usb_disconnect - disconnect a device (usbcore-internal) |
| 1617 | * @pdev: pointer to device being disconnected |
| 1618 | * Context: !in_interrupt () |
| 1619 | * |
| 1620 | * Something got disconnected. Get rid of it and all of its children. |
| 1621 | * |
| 1622 | * If *pdev is a normal device then the parent hub must already be locked. |
| 1623 | * If *pdev is a root hub then this routine will acquire the |
| 1624 | * usb_bus_list_lock on behalf of the caller. |
| 1625 | * |
| 1626 | * Only hub drivers (including virtual root hub drivers for host |
| 1627 | * controllers) should ever call this. |
| 1628 | * |
| 1629 | * This call is synchronous, and may not be used in an interrupt context. |
| 1630 | */ |
| 1631 | void usb_disconnect(struct usb_device **pdev) |
| 1632 | { |
| 1633 | struct usb_device *udev = *pdev; |
| 1634 | int i; |
| 1635 | |
| 1636 | if (!udev) { |
| 1637 | pr_debug ("%s nodev\n", __func__); |
| 1638 | return; |
| 1639 | } |
| 1640 | |
| 1641 | /* mark the device as inactive, so any further urb submissions for |
| 1642 | * this device (and any of its children) will fail immediately. |
| 1643 | * this quiesces everything except pending urbs. |
| 1644 | */ |
| 1645 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 1646 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
| 1647 | udev->devnum); |
| 1648 | |
| 1649 | usb_lock_device(udev); |
| 1650 | |
| 1651 | /* Free up all the children before we remove this device */ |
| 1652 | for (i = 0; i < USB_MAXCHILDREN; i++) { |
| 1653 | if (udev->children[i]) |
| 1654 | usb_disconnect(&udev->children[i]); |
| 1655 | } |
| 1656 | |
| 1657 | /* deallocate hcd/hardware state ... nuking all pending urbs and |
| 1658 | * cleaning up all state associated with the current configuration |
| 1659 | * so that the hardware is now fully quiesced. |
| 1660 | */ |
| 1661 | dev_dbg (&udev->dev, "unregistering device\n"); |
| 1662 | usb_disable_device(udev, 0); |
| 1663 | usb_hcd_synchronize_unlinks(udev); |
| 1664 | |
| 1665 | usb_remove_ep_devs(&udev->ep0); |
| 1666 | usb_unlock_device(udev); |
| 1667 | |
| 1668 | /* Unregister the device. The device driver is responsible |
| 1669 | * for de-configuring the device and invoking the remove-device |
| 1670 | * notifier chain (used by usbfs and possibly others). |
| 1671 | */ |
| 1672 | device_del(&udev->dev); |
| 1673 | |
| 1674 | /* Free the device number and delete the parent's children[] |
| 1675 | * (or root_hub) pointer. |
| 1676 | */ |
| 1677 | release_devnum(udev); |
| 1678 | |
| 1679 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
| 1680 | spin_lock_irq(&device_state_lock); |
| 1681 | *pdev = NULL; |
| 1682 | spin_unlock_irq(&device_state_lock); |
| 1683 | |
| 1684 | hub_free_dev(udev); |
| 1685 | |
| 1686 | put_device(&udev->dev); |
| 1687 | } |
| 1688 | |
| 1689 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| 1690 | static void show_string(struct usb_device *udev, char *id, char *string) |
| 1691 | { |
| 1692 | if (!string) |
| 1693 | return; |
| 1694 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); |
| 1695 | } |
| 1696 | |
| 1697 | static void announce_device(struct usb_device *udev) |
| 1698 | { |
| 1699 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", |
| 1700 | le16_to_cpu(udev->descriptor.idVendor), |
| 1701 | le16_to_cpu(udev->descriptor.idProduct)); |
| 1702 | dev_info(&udev->dev, |
| 1703 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
| 1704 | udev->descriptor.iManufacturer, |
| 1705 | udev->descriptor.iProduct, |
| 1706 | udev->descriptor.iSerialNumber); |
| 1707 | show_string(udev, "Product", udev->product); |
| 1708 | show_string(udev, "Manufacturer", udev->manufacturer); |
| 1709 | show_string(udev, "SerialNumber", udev->serial); |
| 1710 | } |
| 1711 | #else |
| 1712 | static inline void announce_device(struct usb_device *udev) { } |
| 1713 | #endif |
| 1714 | |
| 1715 | #ifdef CONFIG_USB_OTG |
| 1716 | #include "otg_whitelist.h" |
| 1717 | #endif |
| 1718 | |
| 1719 | /** |
| 1720 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
| 1721 | * @udev: newly addressed device (in ADDRESS state) |
| 1722 | * |
| 1723 | * Finish enumeration for On-The-Go devices |
| 1724 | */ |
| 1725 | static int usb_enumerate_device_otg(struct usb_device *udev) |
| 1726 | { |
| 1727 | int err = 0; |
| 1728 | |
| 1729 | #ifdef CONFIG_USB_OTG |
| 1730 | /* |
| 1731 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
| 1732 | * to wake us after we've powered off VBUS; and HNP, switching roles |
| 1733 | * "host" to "peripheral". The OTG descriptor helps figure this out. |
| 1734 | */ |
| 1735 | if (!udev->bus->is_b_host |
| 1736 | && udev->config |
| 1737 | && udev->parent == udev->bus->root_hub) { |
| 1738 | struct usb_otg_descriptor *desc = NULL; |
| 1739 | struct usb_bus *bus = udev->bus; |
| 1740 | |
| 1741 | /* descriptor may appear anywhere in config */ |
| 1742 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], |
| 1743 | le16_to_cpu(udev->config[0].desc.wTotalLength), |
| 1744 | USB_DT_OTG, (void **) &desc) == 0) { |
| 1745 | if (desc->bmAttributes & USB_OTG_HNP) { |
| 1746 | unsigned port1 = udev->portnum; |
| 1747 | |
| 1748 | dev_info(&udev->dev, |
| 1749 | "Dual-Role OTG device on %sHNP port\n", |
| 1750 | (port1 == bus->otg_port) |
| 1751 | ? "" : "non-"); |
| 1752 | |
| 1753 | /* enable HNP before suspend, it's simpler */ |
| 1754 | if (port1 == bus->otg_port) |
| 1755 | bus->b_hnp_enable = 1; |
| 1756 | err = usb_control_msg(udev, |
| 1757 | usb_sndctrlpipe(udev, 0), |
| 1758 | USB_REQ_SET_FEATURE, 0, |
| 1759 | bus->b_hnp_enable |
| 1760 | ? USB_DEVICE_B_HNP_ENABLE |
| 1761 | : USB_DEVICE_A_ALT_HNP_SUPPORT, |
| 1762 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 1763 | if (err < 0) { |
| 1764 | /* OTG MESSAGE: report errors here, |
| 1765 | * customize to match your product. |
| 1766 | */ |
| 1767 | dev_info(&udev->dev, |
| 1768 | "can't set HNP mode: %d\n", |
| 1769 | err); |
| 1770 | bus->b_hnp_enable = 0; |
| 1771 | } |
| 1772 | } |
| 1773 | } |
| 1774 | } |
| 1775 | |
| 1776 | if (!is_targeted(udev)) { |
| 1777 | |
| 1778 | /* Maybe it can talk to us, though we can't talk to it. |
| 1779 | * (Includes HNP test device.) |
| 1780 | */ |
| 1781 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { |
| 1782 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
| 1783 | if (err < 0) |
| 1784 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
| 1785 | } |
| 1786 | err = -ENOTSUPP; |
| 1787 | goto fail; |
| 1788 | } |
| 1789 | fail: |
| 1790 | #endif |
| 1791 | return err; |
| 1792 | } |
| 1793 | |
| 1794 | |
| 1795 | /** |
| 1796 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
| 1797 | * @udev: newly addressed device (in ADDRESS state) |
| 1798 | * |
| 1799 | * This is only called by usb_new_device() and usb_authorize_device() |
| 1800 | * and FIXME -- all comments that apply to them apply here wrt to |
| 1801 | * environment. |
| 1802 | * |
| 1803 | * If the device is WUSB and not authorized, we don't attempt to read |
| 1804 | * the string descriptors, as they will be errored out by the device |
| 1805 | * until it has been authorized. |
| 1806 | */ |
| 1807 | static int usb_enumerate_device(struct usb_device *udev) |
| 1808 | { |
| 1809 | int err; |
| 1810 | |
| 1811 | if (udev->config == NULL) { |
| 1812 | err = usb_get_configuration(udev); |
| 1813 | if (err < 0) { |
| 1814 | dev_err(&udev->dev, "can't read configurations, error %d\n", |
| 1815 | err); |
| 1816 | goto fail; |
| 1817 | } |
| 1818 | } |
| 1819 | if (udev->wusb == 1 && udev->authorized == 0) { |
| 1820 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1821 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1822 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1823 | } |
| 1824 | else { |
| 1825 | /* read the standard strings and cache them if present */ |
| 1826 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
| 1827 | udev->manufacturer = usb_cache_string(udev, |
| 1828 | udev->descriptor.iManufacturer); |
| 1829 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
| 1830 | } |
| 1831 | err = usb_enumerate_device_otg(udev); |
| 1832 | fail: |
| 1833 | return err; |
| 1834 | } |
| 1835 | |
| 1836 | |
| 1837 | /** |
| 1838 | * usb_new_device - perform initial device setup (usbcore-internal) |
| 1839 | * @udev: newly addressed device (in ADDRESS state) |
| 1840 | * |
| 1841 | * This is called with devices which have been detected but not fully |
| 1842 | * enumerated. The device descriptor is available, but not descriptors |
| 1843 | * for any device configuration. The caller must have locked either |
| 1844 | * the parent hub (if udev is a normal device) or else the |
| 1845 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to |
| 1846 | * udev has already been installed, but udev is not yet visible through |
| 1847 | * sysfs or other filesystem code. |
| 1848 | * |
| 1849 | * It will return if the device is configured properly or not. Zero if |
| 1850 | * the interface was registered with the driver core; else a negative |
| 1851 | * errno value. |
| 1852 | * |
| 1853 | * This call is synchronous, and may not be used in an interrupt context. |
| 1854 | * |
| 1855 | * Only the hub driver or root-hub registrar should ever call this. |
| 1856 | */ |
| 1857 | int usb_new_device(struct usb_device *udev) |
| 1858 | { |
| 1859 | int err; |
| 1860 | |
| 1861 | if (udev->parent) { |
| 1862 | /* Initialize non-root-hub device wakeup to disabled; |
| 1863 | * device (un)configuration controls wakeup capable |
| 1864 | * sysfs power/wakeup controls wakeup enabled/disabled |
| 1865 | */ |
| 1866 | device_init_wakeup(&udev->dev, 0); |
| 1867 | } |
| 1868 | |
| 1869 | /* Tell the runtime-PM framework the device is active */ |
| 1870 | pm_runtime_set_active(&udev->dev); |
| 1871 | pm_runtime_get_noresume(&udev->dev); |
| 1872 | pm_runtime_use_autosuspend(&udev->dev); |
| 1873 | pm_runtime_enable(&udev->dev); |
| 1874 | |
| 1875 | /* By default, forbid autosuspend for all devices. It will be |
| 1876 | * allowed for hubs during binding. |
| 1877 | */ |
| 1878 | usb_disable_autosuspend(udev); |
| 1879 | |
| 1880 | err = usb_enumerate_device(udev); /* Read descriptors */ |
| 1881 | if (err < 0) |
| 1882 | goto fail; |
| 1883 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
| 1884 | udev->devnum, udev->bus->busnum, |
| 1885 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| 1886 | /* export the usbdev device-node for libusb */ |
| 1887 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, |
| 1888 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| 1889 | |
| 1890 | /* Tell the world! */ |
| 1891 | announce_device(udev); |
| 1892 | |
| 1893 | device_enable_async_suspend(&udev->dev); |
| 1894 | /* Register the device. The device driver is responsible |
| 1895 | * for configuring the device and invoking the add-device |
| 1896 | * notifier chain (used by usbfs and possibly others). |
| 1897 | */ |
| 1898 | err = device_add(&udev->dev); |
| 1899 | if (err) { |
| 1900 | dev_err(&udev->dev, "can't device_add, error %d\n", err); |
| 1901 | goto fail; |
| 1902 | } |
| 1903 | |
| 1904 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
| 1905 | usb_mark_last_busy(udev); |
| 1906 | pm_runtime_put_sync_autosuspend(&udev->dev); |
| 1907 | return err; |
| 1908 | |
| 1909 | fail: |
| 1910 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 1911 | pm_runtime_disable(&udev->dev); |
| 1912 | pm_runtime_set_suspended(&udev->dev); |
| 1913 | return err; |
| 1914 | } |
| 1915 | |
| 1916 | |
| 1917 | /** |
| 1918 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
| 1919 | * @usb_dev: USB device |
| 1920 | * |
| 1921 | * Move the USB device to a very basic state where interfaces are disabled |
| 1922 | * and the device is in fact unconfigured and unusable. |
| 1923 | * |
| 1924 | * We share a lock (that we have) with device_del(), so we need to |
| 1925 | * defer its call. |
| 1926 | */ |
| 1927 | int usb_deauthorize_device(struct usb_device *usb_dev) |
| 1928 | { |
| 1929 | usb_lock_device(usb_dev); |
| 1930 | if (usb_dev->authorized == 0) |
| 1931 | goto out_unauthorized; |
| 1932 | |
| 1933 | usb_dev->authorized = 0; |
| 1934 | usb_set_configuration(usb_dev, -1); |
| 1935 | |
| 1936 | kfree(usb_dev->product); |
| 1937 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1938 | kfree(usb_dev->manufacturer); |
| 1939 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1940 | kfree(usb_dev->serial); |
| 1941 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1942 | |
| 1943 | usb_destroy_configuration(usb_dev); |
| 1944 | usb_dev->descriptor.bNumConfigurations = 0; |
| 1945 | |
| 1946 | out_unauthorized: |
| 1947 | usb_unlock_device(usb_dev); |
| 1948 | return 0; |
| 1949 | } |
| 1950 | |
| 1951 | |
| 1952 | int usb_authorize_device(struct usb_device *usb_dev) |
| 1953 | { |
| 1954 | int result = 0, c; |
| 1955 | |
| 1956 | usb_lock_device(usb_dev); |
| 1957 | if (usb_dev->authorized == 1) |
| 1958 | goto out_authorized; |
| 1959 | |
| 1960 | result = usb_autoresume_device(usb_dev); |
| 1961 | if (result < 0) { |
| 1962 | dev_err(&usb_dev->dev, |
| 1963 | "can't autoresume for authorization: %d\n", result); |
| 1964 | goto error_autoresume; |
| 1965 | } |
| 1966 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); |
| 1967 | if (result < 0) { |
| 1968 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " |
| 1969 | "authorization: %d\n", result); |
| 1970 | goto error_device_descriptor; |
| 1971 | } |
| 1972 | |
| 1973 | kfree(usb_dev->product); |
| 1974 | usb_dev->product = NULL; |
| 1975 | kfree(usb_dev->manufacturer); |
| 1976 | usb_dev->manufacturer = NULL; |
| 1977 | kfree(usb_dev->serial); |
| 1978 | usb_dev->serial = NULL; |
| 1979 | |
| 1980 | usb_dev->authorized = 1; |
| 1981 | result = usb_enumerate_device(usb_dev); |
| 1982 | if (result < 0) |
| 1983 | goto error_enumerate; |
| 1984 | /* Choose and set the configuration. This registers the interfaces |
| 1985 | * with the driver core and lets interface drivers bind to them. |
| 1986 | */ |
| 1987 | c = usb_choose_configuration(usb_dev); |
| 1988 | if (c >= 0) { |
| 1989 | result = usb_set_configuration(usb_dev, c); |
| 1990 | if (result) { |
| 1991 | dev_err(&usb_dev->dev, |
| 1992 | "can't set config #%d, error %d\n", c, result); |
| 1993 | /* This need not be fatal. The user can try to |
| 1994 | * set other configurations. */ |
| 1995 | } |
| 1996 | } |
| 1997 | dev_info(&usb_dev->dev, "authorized to connect\n"); |
| 1998 | |
| 1999 | error_enumerate: |
| 2000 | error_device_descriptor: |
| 2001 | usb_autosuspend_device(usb_dev); |
| 2002 | error_autoresume: |
| 2003 | out_authorized: |
| 2004 | usb_unlock_device(usb_dev); // complements locktree |
| 2005 | return result; |
| 2006 | } |
| 2007 | |
| 2008 | |
| 2009 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
| 2010 | static unsigned hub_is_wusb(struct usb_hub *hub) |
| 2011 | { |
| 2012 | struct usb_hcd *hcd; |
| 2013 | if (hub->hdev->parent != NULL) /* not a root hub? */ |
| 2014 | return 0; |
| 2015 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); |
| 2016 | return hcd->wireless; |
| 2017 | } |
| 2018 | |
| 2019 | |
| 2020 | #define PORT_RESET_TRIES 5 |
| 2021 | #define SET_ADDRESS_TRIES 2 |
| 2022 | #define GET_DESCRIPTOR_TRIES 2 |
| 2023 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) |
| 2024 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) |
| 2025 | |
| 2026 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| 2027 | #define HUB_SHORT_RESET_TIME 10 |
| 2028 | #define HUB_LONG_RESET_TIME 200 |
| 2029 | #define HUB_RESET_TIMEOUT 500 |
| 2030 | |
| 2031 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
| 2032 | struct usb_device *udev, unsigned int delay) |
| 2033 | { |
| 2034 | int delay_time, ret; |
| 2035 | u16 portstatus; |
| 2036 | u16 portchange; |
| 2037 | |
| 2038 | for (delay_time = 0; |
| 2039 | delay_time < HUB_RESET_TIMEOUT; |
| 2040 | delay_time += delay) { |
| 2041 | /* wait to give the device a chance to reset */ |
| 2042 | msleep(delay); |
| 2043 | |
| 2044 | /* read and decode port status */ |
| 2045 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2046 | if (ret < 0) |
| 2047 | return ret; |
| 2048 | |
| 2049 | /* Device went away? */ |
| 2050 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
| 2051 | return -ENOTCONN; |
| 2052 | |
| 2053 | /* bomb out completely if the connection bounced */ |
| 2054 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
| 2055 | return -ENOTCONN; |
| 2056 | |
| 2057 | /* if we`ve finished resetting, then break out of the loop */ |
| 2058 | if (!(portstatus & USB_PORT_STAT_RESET) && |
| 2059 | (portstatus & USB_PORT_STAT_ENABLE)) { |
| 2060 | if (hub_is_wusb(hub)) |
| 2061 | udev->speed = USB_SPEED_WIRELESS; |
| 2062 | else if (hub_is_superspeed(hub->hdev)) |
| 2063 | udev->speed = USB_SPEED_SUPER; |
| 2064 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| 2065 | udev->speed = USB_SPEED_HIGH; |
| 2066 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| 2067 | udev->speed = USB_SPEED_LOW; |
| 2068 | else |
| 2069 | udev->speed = USB_SPEED_FULL; |
| 2070 | return 0; |
| 2071 | } |
| 2072 | |
| 2073 | /* switch to the long delay after two short delay failures */ |
| 2074 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
| 2075 | delay = HUB_LONG_RESET_TIME; |
| 2076 | |
| 2077 | dev_dbg (hub->intfdev, |
| 2078 | "port %d not reset yet, waiting %dms\n", |
| 2079 | port1, delay); |
| 2080 | } |
| 2081 | |
| 2082 | return -EBUSY; |
| 2083 | } |
| 2084 | |
| 2085 | static int hub_port_reset(struct usb_hub *hub, int port1, |
| 2086 | struct usb_device *udev, unsigned int delay) |
| 2087 | { |
| 2088 | int i, status; |
| 2089 | struct usb_hcd *hcd; |
| 2090 | |
| 2091 | hcd = bus_to_hcd(udev->bus); |
| 2092 | /* Block EHCI CF initialization during the port reset. |
| 2093 | * Some companion controllers don't like it when they mix. |
| 2094 | */ |
| 2095 | down_read(&ehci_cf_port_reset_rwsem); |
| 2096 | |
| 2097 | /* Reset the port */ |
| 2098 | for (i = 0; i < PORT_RESET_TRIES; i++) { |
| 2099 | status = set_port_feature(hub->hdev, |
| 2100 | port1, USB_PORT_FEAT_RESET); |
| 2101 | if (status) |
| 2102 | dev_err(hub->intfdev, |
| 2103 | "cannot reset port %d (err = %d)\n", |
| 2104 | port1, status); |
| 2105 | else { |
| 2106 | status = hub_port_wait_reset(hub, port1, udev, delay); |
| 2107 | if (status && status != -ENOTCONN) |
| 2108 | dev_dbg(hub->intfdev, |
| 2109 | "port_wait_reset: err = %d\n", |
| 2110 | status); |
| 2111 | } |
| 2112 | |
| 2113 | /* return on disconnect or reset */ |
| 2114 | switch (status) { |
| 2115 | case 0: |
| 2116 | /* TRSTRCY = 10 ms; plus some extra */ |
| 2117 | msleep(10 + 40); |
| 2118 | update_devnum(udev, 0); |
| 2119 | if (hcd->driver->reset_device) { |
| 2120 | status = hcd->driver->reset_device(hcd, udev); |
| 2121 | if (status < 0) { |
| 2122 | dev_err(&udev->dev, "Cannot reset " |
| 2123 | "HCD device state\n"); |
| 2124 | break; |
| 2125 | } |
| 2126 | } |
| 2127 | /* FALL THROUGH */ |
| 2128 | case -ENOTCONN: |
| 2129 | case -ENODEV: |
| 2130 | clear_port_feature(hub->hdev, |
| 2131 | port1, USB_PORT_FEAT_C_RESET); |
| 2132 | /* FIXME need disconnect() for NOTATTACHED device */ |
| 2133 | usb_set_device_state(udev, status |
| 2134 | ? USB_STATE_NOTATTACHED |
| 2135 | : USB_STATE_DEFAULT); |
| 2136 | goto done; |
| 2137 | } |
| 2138 | |
| 2139 | dev_dbg (hub->intfdev, |
| 2140 | "port %d not enabled, trying reset again...\n", |
| 2141 | port1); |
| 2142 | delay = HUB_LONG_RESET_TIME; |
| 2143 | } |
| 2144 | |
| 2145 | dev_err (hub->intfdev, |
| 2146 | "Cannot enable port %i. Maybe the USB cable is bad?\n", |
| 2147 | port1); |
| 2148 | |
| 2149 | done: |
| 2150 | up_read(&ehci_cf_port_reset_rwsem); |
| 2151 | return status; |
| 2152 | } |
| 2153 | |
| 2154 | /* Check if a port is power on */ |
| 2155 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) |
| 2156 | { |
| 2157 | int ret = 0; |
| 2158 | |
| 2159 | if (hub_is_superspeed(hub->hdev)) { |
| 2160 | if (portstatus & USB_SS_PORT_STAT_POWER) |
| 2161 | ret = 1; |
| 2162 | } else { |
| 2163 | if (portstatus & USB_PORT_STAT_POWER) |
| 2164 | ret = 1; |
| 2165 | } |
| 2166 | |
| 2167 | return ret; |
| 2168 | } |
| 2169 | |
| 2170 | #ifdef CONFIG_PM |
| 2171 | |
| 2172 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
| 2173 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) |
| 2174 | { |
| 2175 | int ret = 0; |
| 2176 | |
| 2177 | if (hub_is_superspeed(hub->hdev)) { |
| 2178 | if ((portstatus & USB_PORT_STAT_LINK_STATE) |
| 2179 | == USB_SS_PORT_LS_U3) |
| 2180 | ret = 1; |
| 2181 | } else { |
| 2182 | if (portstatus & USB_PORT_STAT_SUSPEND) |
| 2183 | ret = 1; |
| 2184 | } |
| 2185 | |
| 2186 | return ret; |
| 2187 | } |
| 2188 | |
| 2189 | /* Determine whether the device on a port is ready for a normal resume, |
| 2190 | * is ready for a reset-resume, or should be disconnected. |
| 2191 | */ |
| 2192 | static int check_port_resume_type(struct usb_device *udev, |
| 2193 | struct usb_hub *hub, int port1, |
| 2194 | int status, unsigned portchange, unsigned portstatus) |
| 2195 | { |
| 2196 | /* Is the device still present? */ |
| 2197 | if (status || port_is_suspended(hub, portstatus) || |
| 2198 | !port_is_power_on(hub, portstatus) || |
| 2199 | !(portstatus & USB_PORT_STAT_CONNECTION)) { |
| 2200 | if (status >= 0) |
| 2201 | status = -ENODEV; |
| 2202 | } |
| 2203 | |
| 2204 | /* Can't do a normal resume if the port isn't enabled, |
| 2205 | * so try a reset-resume instead. |
| 2206 | */ |
| 2207 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { |
| 2208 | if (udev->persist_enabled) |
| 2209 | udev->reset_resume = 1; |
| 2210 | else |
| 2211 | status = -ENODEV; |
| 2212 | } |
| 2213 | |
| 2214 | if (status) { |
| 2215 | dev_dbg(hub->intfdev, |
| 2216 | "port %d status %04x.%04x after resume, %d\n", |
| 2217 | port1, portchange, portstatus, status); |
| 2218 | } else if (udev->reset_resume) { |
| 2219 | |
| 2220 | /* Late port handoff can set status-change bits */ |
| 2221 | if (portchange & USB_PORT_STAT_C_CONNECTION) |
| 2222 | clear_port_feature(hub->hdev, port1, |
| 2223 | USB_PORT_FEAT_C_CONNECTION); |
| 2224 | if (portchange & USB_PORT_STAT_C_ENABLE) |
| 2225 | clear_port_feature(hub->hdev, port1, |
| 2226 | USB_PORT_FEAT_C_ENABLE); |
| 2227 | } |
| 2228 | |
| 2229 | return status; |
| 2230 | } |
| 2231 | |
| 2232 | #ifdef CONFIG_USB_SUSPEND |
| 2233 | |
| 2234 | /* |
| 2235 | * usb_port_suspend - suspend a usb device's upstream port |
| 2236 | * @udev: device that's no longer in active use, not a root hub |
| 2237 | * Context: must be able to sleep; device not locked; pm locks held |
| 2238 | * |
| 2239 | * Suspends a USB device that isn't in active use, conserving power. |
| 2240 | * Devices may wake out of a suspend, if anything important happens, |
| 2241 | * using the remote wakeup mechanism. They may also be taken out of |
| 2242 | * suspend by the host, using usb_port_resume(). It's also routine |
| 2243 | * to disconnect devices while they are suspended. |
| 2244 | * |
| 2245 | * This only affects the USB hardware for a device; its interfaces |
| 2246 | * (and, for hubs, child devices) must already have been suspended. |
| 2247 | * |
| 2248 | * Selective port suspend reduces power; most suspended devices draw |
| 2249 | * less than 500 uA. It's also used in OTG, along with remote wakeup. |
| 2250 | * All devices below the suspended port are also suspended. |
| 2251 | * |
| 2252 | * Devices leave suspend state when the host wakes them up. Some devices |
| 2253 | * also support "remote wakeup", where the device can activate the USB |
| 2254 | * tree above them to deliver data, such as a keypress or packet. In |
| 2255 | * some cases, this wakes the USB host. |
| 2256 | * |
| 2257 | * Suspending OTG devices may trigger HNP, if that's been enabled |
| 2258 | * between a pair of dual-role devices. That will change roles, such |
| 2259 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
| 2260 | * |
| 2261 | * Devices on USB hub ports have only one "suspend" state, corresponding |
| 2262 | * to ACPI D2, "may cause the device to lose some context". |
| 2263 | * State transitions include: |
| 2264 | * |
| 2265 | * - suspend, resume ... when the VBUS power link stays live |
| 2266 | * - suspend, disconnect ... VBUS lost |
| 2267 | * |
| 2268 | * Once VBUS drop breaks the circuit, the port it's using has to go through |
| 2269 | * normal re-enumeration procedures, starting with enabling VBUS power. |
| 2270 | * Other than re-initializing the hub (plug/unplug, except for root hubs), |
| 2271 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd |
| 2272 | * timer, no SRP, no requests through sysfs. |
| 2273 | * |
| 2274 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when |
| 2275 | * the root hub for their bus goes into global suspend ... so we don't |
| 2276 | * (falsely) update the device power state to say it suspended. |
| 2277 | * |
| 2278 | * Returns 0 on success, else negative errno. |
| 2279 | */ |
| 2280 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
| 2281 | { |
| 2282 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2283 | int port1 = udev->portnum; |
| 2284 | int status; |
| 2285 | |
| 2286 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); |
| 2287 | |
| 2288 | /* enable remote wakeup when appropriate; this lets the device |
| 2289 | * wake up the upstream hub (including maybe the root hub). |
| 2290 | * |
| 2291 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when |
| 2292 | * we don't explicitly enable it here. |
| 2293 | */ |
| 2294 | if (udev->do_remote_wakeup) { |
| 2295 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 2296 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| 2297 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2298 | NULL, 0, |
| 2299 | USB_CTRL_SET_TIMEOUT); |
| 2300 | if (status) { |
| 2301 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
| 2302 | status); |
| 2303 | /* bail if autosuspend is requested */ |
| 2304 | if (msg.event & PM_EVENT_AUTO) |
| 2305 | return status; |
| 2306 | } |
| 2307 | } |
| 2308 | |
| 2309 | /* see 7.1.7.6 */ |
| 2310 | /* Clear PORT_POWER if it's a USB3.0 device connected to USB 3.0 |
| 2311 | * external hub. |
| 2312 | * FIXME: this is a temporary workaround to make the system able |
| 2313 | * to suspend/resume. |
| 2314 | */ |
| 2315 | if ((hub->hdev->parent != NULL) && hub_is_superspeed(hub->hdev)) |
| 2316 | status = clear_port_feature(hub->hdev, port1, |
| 2317 | USB_PORT_FEAT_POWER); |
| 2318 | else |
| 2319 | status = set_port_feature(hub->hdev, port1, |
| 2320 | USB_PORT_FEAT_SUSPEND); |
| 2321 | if (status) { |
| 2322 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
| 2323 | port1, status); |
| 2324 | /* paranoia: "should not happen" */ |
| 2325 | if (udev->do_remote_wakeup) |
| 2326 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 2327 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| 2328 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2329 | NULL, 0, |
| 2330 | USB_CTRL_SET_TIMEOUT); |
| 2331 | } else { |
| 2332 | /* device has up to 10 msec to fully suspend */ |
| 2333 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
| 2334 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
| 2335 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
| 2336 | msleep(10); |
| 2337 | } |
| 2338 | usb_mark_last_busy(hub->hdev); |
| 2339 | return status; |
| 2340 | } |
| 2341 | |
| 2342 | /* |
| 2343 | * If the USB "suspend" state is in use (rather than "global suspend"), |
| 2344 | * many devices will be individually taken out of suspend state using |
| 2345 | * special "resume" signaling. This routine kicks in shortly after |
| 2346 | * hardware resume signaling is finished, either because of selective |
| 2347 | * resume (by host) or remote wakeup (by device) ... now see what changed |
| 2348 | * in the tree that's rooted at this device. |
| 2349 | * |
| 2350 | * If @udev->reset_resume is set then the device is reset before the |
| 2351 | * status check is done. |
| 2352 | */ |
| 2353 | static int finish_port_resume(struct usb_device *udev) |
| 2354 | { |
| 2355 | int status = 0; |
| 2356 | u16 devstatus; |
| 2357 | |
| 2358 | /* caller owns the udev device lock */ |
| 2359 | dev_dbg(&udev->dev, "%s\n", |
| 2360 | udev->reset_resume ? "finish reset-resume" : "finish resume"); |
| 2361 | |
| 2362 | /* usb ch9 identifies four variants of SUSPENDED, based on what |
| 2363 | * state the device resumes to. Linux currently won't see the |
| 2364 | * first two on the host side; they'd be inside hub_port_init() |
| 2365 | * during many timeouts, but khubd can't suspend until later. |
| 2366 | */ |
| 2367 | usb_set_device_state(udev, udev->actconfig |
| 2368 | ? USB_STATE_CONFIGURED |
| 2369 | : USB_STATE_ADDRESS); |
| 2370 | |
| 2371 | /* 10.5.4.5 says not to reset a suspended port if the attached |
| 2372 | * device is enabled for remote wakeup. Hence the reset |
| 2373 | * operation is carried out here, after the port has been |
| 2374 | * resumed. |
| 2375 | */ |
| 2376 | if (udev->reset_resume) |
| 2377 | retry_reset_resume: |
| 2378 | status = usb_reset_and_verify_device(udev); |
| 2379 | |
| 2380 | /* 10.5.4.5 says be sure devices in the tree are still there. |
| 2381 | * For now let's assume the device didn't go crazy on resume, |
| 2382 | * and device drivers will know about any resume quirks. |
| 2383 | */ |
| 2384 | if (status == 0) { |
| 2385 | devstatus = 0; |
| 2386 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
| 2387 | if (status >= 0) |
| 2388 | status = (status > 0 ? 0 : -ENODEV); |
| 2389 | |
| 2390 | /* If a normal resume failed, try doing a reset-resume */ |
| 2391 | if (status && !udev->reset_resume && udev->persist_enabled) { |
| 2392 | dev_dbg(&udev->dev, "retry with reset-resume\n"); |
| 2393 | udev->reset_resume = 1; |
| 2394 | goto retry_reset_resume; |
| 2395 | } |
| 2396 | } |
| 2397 | |
| 2398 | if (status) { |
| 2399 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", |
| 2400 | status); |
| 2401 | } else if (udev->actconfig) { |
| 2402 | le16_to_cpus(&devstatus); |
| 2403 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
| 2404 | status = usb_control_msg(udev, |
| 2405 | usb_sndctrlpipe(udev, 0), |
| 2406 | USB_REQ_CLEAR_FEATURE, |
| 2407 | USB_RECIP_DEVICE, |
| 2408 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2409 | NULL, 0, |
| 2410 | USB_CTRL_SET_TIMEOUT); |
| 2411 | if (status) |
| 2412 | dev_dbg(&udev->dev, |
| 2413 | "disable remote wakeup, status %d\n", |
| 2414 | status); |
| 2415 | } |
| 2416 | status = 0; |
| 2417 | } |
| 2418 | return status; |
| 2419 | } |
| 2420 | |
| 2421 | /* |
| 2422 | * usb_port_resume - re-activate a suspended usb device's upstream port |
| 2423 | * @udev: device to re-activate, not a root hub |
| 2424 | * Context: must be able to sleep; device not locked; pm locks held |
| 2425 | * |
| 2426 | * This will re-activate the suspended device, increasing power usage |
| 2427 | * while letting drivers communicate again with its endpoints. |
| 2428 | * USB resume explicitly guarantees that the power session between |
| 2429 | * the host and the device is the same as it was when the device |
| 2430 | * suspended. |
| 2431 | * |
| 2432 | * If @udev->reset_resume is set then this routine won't check that the |
| 2433 | * port is still enabled. Furthermore, finish_port_resume() above will |
| 2434 | * reset @udev. The end result is that a broken power session can be |
| 2435 | * recovered and @udev will appear to persist across a loss of VBUS power. |
| 2436 | * |
| 2437 | * For example, if a host controller doesn't maintain VBUS suspend current |
| 2438 | * during a system sleep or is reset when the system wakes up, all the USB |
| 2439 | * power sessions below it will be broken. This is especially troublesome |
| 2440 | * for mass-storage devices containing mounted filesystems, since the |
| 2441 | * device will appear to have disconnected and all the memory mappings |
| 2442 | * to it will be lost. Using the USB_PERSIST facility, the device can be |
| 2443 | * made to appear as if it had not disconnected. |
| 2444 | * |
| 2445 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
| 2446 | * every effort to insure that the same device is present after the |
| 2447 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
| 2448 | * quite possible for a device to remain unaltered but its media to be |
| 2449 | * changed. If the user replaces a flash memory card while the system is |
| 2450 | * asleep, he will have only himself to blame when the filesystem on the |
| 2451 | * new card is corrupted and the system crashes. |
| 2452 | * |
| 2453 | * Returns 0 on success, else negative errno. |
| 2454 | */ |
| 2455 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
| 2456 | { |
| 2457 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2458 | int port1 = udev->portnum; |
| 2459 | int status; |
| 2460 | u16 portchange, portstatus; |
| 2461 | |
| 2462 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
| 2463 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2464 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
| 2465 | goto SuspendCleared; |
| 2466 | |
| 2467 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); |
| 2468 | |
| 2469 | set_bit(port1, hub->busy_bits); |
| 2470 | |
| 2471 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
| 2472 | status = clear_port_feature(hub->hdev, |
| 2473 | port1, USB_PORT_FEAT_SUSPEND); |
| 2474 | if (status) { |
| 2475 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
| 2476 | port1, status); |
| 2477 | } else { |
| 2478 | /* drive resume for at least 20 msec */ |
| 2479 | dev_dbg(&udev->dev, "usb %sresume\n", |
| 2480 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
| 2481 | msleep(25); |
| 2482 | |
| 2483 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
| 2484 | * stop resume signaling. Then finish the resume |
| 2485 | * sequence. |
| 2486 | */ |
| 2487 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2488 | |
| 2489 | /* TRSMRCY = 10 msec */ |
| 2490 | msleep(10); |
| 2491 | } |
| 2492 | |
| 2493 | SuspendCleared: |
| 2494 | if (status == 0) { |
| 2495 | if (portchange & USB_PORT_STAT_C_SUSPEND) |
| 2496 | clear_port_feature(hub->hdev, port1, |
| 2497 | USB_PORT_FEAT_C_SUSPEND); |
| 2498 | } |
| 2499 | |
| 2500 | clear_bit(port1, hub->busy_bits); |
| 2501 | |
| 2502 | status = check_port_resume_type(udev, |
| 2503 | hub, port1, status, portchange, portstatus); |
| 2504 | if (status == 0) |
| 2505 | status = finish_port_resume(udev); |
| 2506 | if (status < 0) { |
| 2507 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| 2508 | hub_port_logical_disconnect(hub, port1); |
| 2509 | } |
| 2510 | return status; |
| 2511 | } |
| 2512 | |
| 2513 | /* caller has locked udev */ |
| 2514 | int usb_remote_wakeup(struct usb_device *udev) |
| 2515 | { |
| 2516 | int status = 0; |
| 2517 | |
| 2518 | if (udev->state == USB_STATE_SUSPENDED) { |
| 2519 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
| 2520 | status = usb_autoresume_device(udev); |
| 2521 | if (status == 0) { |
| 2522 | /* Let the drivers do their thing, then... */ |
| 2523 | usb_autosuspend_device(udev); |
| 2524 | } |
| 2525 | } |
| 2526 | return status; |
| 2527 | } |
| 2528 | |
| 2529 | #else /* CONFIG_USB_SUSPEND */ |
| 2530 | |
| 2531 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ |
| 2532 | |
| 2533 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
| 2534 | { |
| 2535 | return 0; |
| 2536 | } |
| 2537 | |
| 2538 | /* However we may need to do a reset-resume */ |
| 2539 | |
| 2540 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
| 2541 | { |
| 2542 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2543 | int port1 = udev->portnum; |
| 2544 | int status; |
| 2545 | u16 portchange, portstatus; |
| 2546 | |
| 2547 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2548 | status = check_port_resume_type(udev, |
| 2549 | hub, port1, status, portchange, portstatus); |
| 2550 | |
| 2551 | if (status) { |
| 2552 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| 2553 | hub_port_logical_disconnect(hub, port1); |
| 2554 | } else if (udev->reset_resume) { |
| 2555 | dev_dbg(&udev->dev, "reset-resume\n"); |
| 2556 | status = usb_reset_and_verify_device(udev); |
| 2557 | } |
| 2558 | return status; |
| 2559 | } |
| 2560 | |
| 2561 | #endif |
| 2562 | |
| 2563 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
| 2564 | { |
| 2565 | struct usb_hub *hub = usb_get_intfdata (intf); |
| 2566 | struct usb_device *hdev = hub->hdev; |
| 2567 | unsigned port1; |
| 2568 | |
| 2569 | /* fail if children aren't already suspended */ |
| 2570 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| 2571 | struct usb_device *udev; |
| 2572 | |
| 2573 | udev = hdev->children [port1-1]; |
| 2574 | if (udev && udev->can_submit) { |
| 2575 | if (!(msg.event & PM_EVENT_AUTO)) |
| 2576 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
| 2577 | port1); |
| 2578 | return -EBUSY; |
| 2579 | } |
| 2580 | } |
| 2581 | |
| 2582 | dev_dbg(&intf->dev, "%s\n", __func__); |
| 2583 | |
| 2584 | /* stop khubd and related activity */ |
| 2585 | hub_quiesce(hub, HUB_SUSPEND); |
| 2586 | return 0; |
| 2587 | } |
| 2588 | |
| 2589 | static int hub_resume(struct usb_interface *intf) |
| 2590 | { |
| 2591 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 2592 | |
| 2593 | dev_dbg(&intf->dev, "%s\n", __func__); |
| 2594 | hub_activate(hub, HUB_RESUME); |
| 2595 | return 0; |
| 2596 | } |
| 2597 | |
| 2598 | static int hub_reset_resume(struct usb_interface *intf) |
| 2599 | { |
| 2600 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 2601 | |
| 2602 | dev_dbg(&intf->dev, "%s\n", __func__); |
| 2603 | hub_activate(hub, HUB_RESET_RESUME); |
| 2604 | return 0; |
| 2605 | } |
| 2606 | |
| 2607 | /** |
| 2608 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
| 2609 | * @rhdev: struct usb_device for the root hub |
| 2610 | * |
| 2611 | * The USB host controller driver calls this function when its root hub |
| 2612 | * is resumed and Vbus power has been interrupted or the controller |
| 2613 | * has been reset. The routine marks @rhdev as having lost power. |
| 2614 | * When the hub driver is resumed it will take notice and carry out |
| 2615 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; |
| 2616 | * the others will be disconnected. |
| 2617 | */ |
| 2618 | void usb_root_hub_lost_power(struct usb_device *rhdev) |
| 2619 | { |
| 2620 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); |
| 2621 | rhdev->reset_resume = 1; |
| 2622 | } |
| 2623 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
| 2624 | |
| 2625 | #else /* CONFIG_PM */ |
| 2626 | |
| 2627 | #define hub_suspend NULL |
| 2628 | #define hub_resume NULL |
| 2629 | #define hub_reset_resume NULL |
| 2630 | #endif |
| 2631 | |
| 2632 | |
| 2633 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
| 2634 | * |
| 2635 | * Between connect detection and reset signaling there must be a delay |
| 2636 | * of 100ms at least for debounce and power-settling. The corresponding |
| 2637 | * timer shall restart whenever the downstream port detects a disconnect. |
| 2638 | * |
| 2639 | * Apparently there are some bluetooth and irda-dongles and a number of |
| 2640 | * low-speed devices for which this debounce period may last over a second. |
| 2641 | * Not covered by the spec - but easy to deal with. |
| 2642 | * |
| 2643 | * This implementation uses a 1500ms total debounce timeout; if the |
| 2644 | * connection isn't stable by then it returns -ETIMEDOUT. It checks |
| 2645 | * every 25ms for transient disconnects. When the port status has been |
| 2646 | * unchanged for 100ms it returns the port status. |
| 2647 | */ |
| 2648 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
| 2649 | { |
| 2650 | int ret; |
| 2651 | int total_time, stable_time = 0; |
| 2652 | u16 portchange, portstatus; |
| 2653 | unsigned connection = 0xffff; |
| 2654 | |
| 2655 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| 2656 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2657 | if (ret < 0) |
| 2658 | return ret; |
| 2659 | |
| 2660 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
| 2661 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
| 2662 | stable_time += HUB_DEBOUNCE_STEP; |
| 2663 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
| 2664 | break; |
| 2665 | } else { |
| 2666 | stable_time = 0; |
| 2667 | connection = portstatus & USB_PORT_STAT_CONNECTION; |
| 2668 | } |
| 2669 | |
| 2670 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 2671 | clear_port_feature(hub->hdev, port1, |
| 2672 | USB_PORT_FEAT_C_CONNECTION); |
| 2673 | } |
| 2674 | |
| 2675 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| 2676 | break; |
| 2677 | msleep(HUB_DEBOUNCE_STEP); |
| 2678 | } |
| 2679 | |
| 2680 | dev_dbg (hub->intfdev, |
| 2681 | "debounce: port %d: total %dms stable %dms status 0x%x\n", |
| 2682 | port1, total_time, stable_time, portstatus); |
| 2683 | |
| 2684 | if (stable_time < HUB_DEBOUNCE_STABLE) |
| 2685 | return -ETIMEDOUT; |
| 2686 | return portstatus; |
| 2687 | } |
| 2688 | |
| 2689 | void usb_ep0_reinit(struct usb_device *udev) |
| 2690 | { |
| 2691 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
| 2692 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); |
| 2693 | usb_enable_endpoint(udev, &udev->ep0, true); |
| 2694 | } |
| 2695 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
| 2696 | |
| 2697 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
| 2698 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
| 2699 | |
| 2700 | static int hub_set_address(struct usb_device *udev, int devnum) |
| 2701 | { |
| 2702 | int retval; |
| 2703 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 2704 | |
| 2705 | /* |
| 2706 | * The host controller will choose the device address, |
| 2707 | * instead of the core having chosen it earlier |
| 2708 | */ |
| 2709 | if (!hcd->driver->address_device && devnum <= 1) |
| 2710 | return -EINVAL; |
| 2711 | if (udev->state == USB_STATE_ADDRESS) |
| 2712 | return 0; |
| 2713 | if (udev->state != USB_STATE_DEFAULT) |
| 2714 | return -EINVAL; |
| 2715 | if (hcd->driver->address_device) |
| 2716 | retval = hcd->driver->address_device(hcd, udev); |
| 2717 | else |
| 2718 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
| 2719 | USB_REQ_SET_ADDRESS, 0, devnum, 0, |
| 2720 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 2721 | if (retval == 0) { |
| 2722 | update_devnum(udev, devnum); |
| 2723 | /* Device now using proper address. */ |
| 2724 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
| 2725 | usb_ep0_reinit(udev); |
| 2726 | } |
| 2727 | return retval; |
| 2728 | } |
| 2729 | |
| 2730 | /* Reset device, (re)assign address, get device descriptor. |
| 2731 | * Device connection must be stable, no more debouncing needed. |
| 2732 | * Returns device in USB_STATE_ADDRESS, except on error. |
| 2733 | * |
| 2734 | * If this is called for an already-existing device (as part of |
| 2735 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
| 2736 | * newly detected device that is not accessible through any global |
| 2737 | * pointers, it's not necessary to lock the device. |
| 2738 | */ |
| 2739 | static int |
| 2740 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, |
| 2741 | int retry_counter) |
| 2742 | { |
| 2743 | static DEFINE_MUTEX(usb_address0_mutex); |
| 2744 | |
| 2745 | struct usb_device *hdev = hub->hdev; |
| 2746 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
| 2747 | int i, j, retval; |
| 2748 | unsigned delay = HUB_SHORT_RESET_TIME; |
| 2749 | enum usb_device_speed oldspeed = udev->speed; |
| 2750 | char *speed, *type; |
| 2751 | int devnum = udev->devnum; |
| 2752 | |
| 2753 | /* root hub ports have a slightly longer reset period |
| 2754 | * (from USB 2.0 spec, section 7.1.7.5) |
| 2755 | */ |
| 2756 | if (!hdev->parent) { |
| 2757 | delay = HUB_ROOT_RESET_TIME; |
| 2758 | if (port1 == hdev->bus->otg_port) |
| 2759 | hdev->bus->b_hnp_enable = 0; |
| 2760 | } |
| 2761 | |
| 2762 | /* Some low speed devices have problems with the quick delay, so */ |
| 2763 | /* be a bit pessimistic with those devices. RHbug #23670 */ |
| 2764 | if (oldspeed == USB_SPEED_LOW) |
| 2765 | delay = HUB_LONG_RESET_TIME; |
| 2766 | |
| 2767 | mutex_lock(&usb_address0_mutex); |
| 2768 | |
| 2769 | /* Reset the device; full speed may morph to high speed */ |
| 2770 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ |
| 2771 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2772 | if (retval < 0) /* error or disconnect */ |
| 2773 | goto fail; |
| 2774 | /* success, speed is known */ |
| 2775 | |
| 2776 | retval = -ENODEV; |
| 2777 | |
| 2778 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { |
| 2779 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
| 2780 | goto fail; |
| 2781 | } |
| 2782 | oldspeed = udev->speed; |
| 2783 | |
| 2784 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| 2785 | * it's fixed size except for full speed devices. |
| 2786 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
| 2787 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. |
| 2788 | */ |
| 2789 | switch (udev->speed) { |
| 2790 | case USB_SPEED_SUPER: |
| 2791 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
| 2792 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
| 2793 | break; |
| 2794 | case USB_SPEED_HIGH: /* fixed at 64 */ |
| 2795 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
| 2796 | break; |
| 2797 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| 2798 | /* to determine the ep0 maxpacket size, try to read |
| 2799 | * the device descriptor to get bMaxPacketSize0 and |
| 2800 | * then correct our initial guess. |
| 2801 | */ |
| 2802 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
| 2803 | break; |
| 2804 | case USB_SPEED_LOW: /* fixed at 8 */ |
| 2805 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
| 2806 | break; |
| 2807 | default: |
| 2808 | goto fail; |
| 2809 | } |
| 2810 | |
| 2811 | type = ""; |
| 2812 | switch (udev->speed) { |
| 2813 | case USB_SPEED_LOW: speed = "low"; break; |
| 2814 | case USB_SPEED_FULL: speed = "full"; break; |
| 2815 | case USB_SPEED_HIGH: speed = "high"; break; |
| 2816 | case USB_SPEED_SUPER: |
| 2817 | speed = "super"; |
| 2818 | break; |
| 2819 | case USB_SPEED_WIRELESS: |
| 2820 | speed = "variable"; |
| 2821 | type = "Wireless "; |
| 2822 | break; |
| 2823 | default: speed = "?"; break; |
| 2824 | } |
| 2825 | if (udev->speed != USB_SPEED_SUPER) |
| 2826 | dev_info(&udev->dev, |
| 2827 | "%s %s speed %sUSB device number %d using %s\n", |
| 2828 | (udev->config) ? "reset" : "new", speed, type, |
| 2829 | devnum, udev->bus->controller->driver->name); |
| 2830 | |
| 2831 | /* Set up TT records, if needed */ |
| 2832 | if (hdev->tt) { |
| 2833 | udev->tt = hdev->tt; |
| 2834 | udev->ttport = hdev->ttport; |
| 2835 | } else if (udev->speed != USB_SPEED_HIGH |
| 2836 | && hdev->speed == USB_SPEED_HIGH) { |
| 2837 | if (!hub->tt.hub) { |
| 2838 | dev_err(&udev->dev, "parent hub has no TT\n"); |
| 2839 | retval = -EINVAL; |
| 2840 | goto fail; |
| 2841 | } |
| 2842 | udev->tt = &hub->tt; |
| 2843 | udev->ttport = port1; |
| 2844 | } |
| 2845 | |
| 2846 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
| 2847 | * Because device hardware and firmware is sometimes buggy in |
| 2848 | * this area, and this is how Linux has done it for ages. |
| 2849 | * Change it cautiously. |
| 2850 | * |
| 2851 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing |
| 2852 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
| 2853 | * so it may help with some non-standards-compliant devices. |
| 2854 | * Otherwise we start with SET_ADDRESS and then try to read the |
| 2855 | * first 8 bytes of the device descriptor to get the ep0 maxpacket |
| 2856 | * value. |
| 2857 | */ |
| 2858 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { |
| 2859 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { |
| 2860 | struct usb_device_descriptor *buf; |
| 2861 | int r = 0; |
| 2862 | |
| 2863 | #define GET_DESCRIPTOR_BUFSIZE 64 |
| 2864 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
| 2865 | if (!buf) { |
| 2866 | retval = -ENOMEM; |
| 2867 | continue; |
| 2868 | } |
| 2869 | |
| 2870 | /* Retry on all errors; some devices are flakey. |
| 2871 | * 255 is for WUSB devices, we actually need to use |
| 2872 | * 512 (WUSB1.0[4.8.1]). |
| 2873 | */ |
| 2874 | for (j = 0; j < 3; ++j) { |
| 2875 | buf->bMaxPacketSize0 = 0; |
| 2876 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
| 2877 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 2878 | USB_DT_DEVICE << 8, 0, |
| 2879 | buf, GET_DESCRIPTOR_BUFSIZE, |
| 2880 | initial_descriptor_timeout); |
| 2881 | switch (buf->bMaxPacketSize0) { |
| 2882 | case 8: case 16: case 32: case 64: case 255: |
| 2883 | if (buf->bDescriptorType == |
| 2884 | USB_DT_DEVICE) { |
| 2885 | r = 0; |
| 2886 | break; |
| 2887 | } |
| 2888 | /* FALL THROUGH */ |
| 2889 | default: |
| 2890 | if (r == 0) |
| 2891 | r = -EPROTO; |
| 2892 | break; |
| 2893 | } |
| 2894 | if (r == 0) |
| 2895 | break; |
| 2896 | } |
| 2897 | udev->descriptor.bMaxPacketSize0 = |
| 2898 | buf->bMaxPacketSize0; |
| 2899 | kfree(buf); |
| 2900 | |
| 2901 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2902 | if (retval < 0) /* error or disconnect */ |
| 2903 | goto fail; |
| 2904 | if (oldspeed != udev->speed) { |
| 2905 | dev_dbg(&udev->dev, |
| 2906 | "device reset changed speed!\n"); |
| 2907 | retval = -ENODEV; |
| 2908 | goto fail; |
| 2909 | } |
| 2910 | if (r) { |
| 2911 | dev_err(&udev->dev, |
| 2912 | "device descriptor read/64, error %d\n", |
| 2913 | r); |
| 2914 | retval = -EMSGSIZE; |
| 2915 | continue; |
| 2916 | } |
| 2917 | #undef GET_DESCRIPTOR_BUFSIZE |
| 2918 | } |
| 2919 | |
| 2920 | /* |
| 2921 | * If device is WUSB, we already assigned an |
| 2922 | * unauthorized address in the Connect Ack sequence; |
| 2923 | * authorization will assign the final address. |
| 2924 | */ |
| 2925 | if (udev->wusb == 0) { |
| 2926 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
| 2927 | retval = hub_set_address(udev, devnum); |
| 2928 | if (retval >= 0) |
| 2929 | break; |
| 2930 | msleep(200); |
| 2931 | } |
| 2932 | if (retval < 0) { |
| 2933 | dev_err(&udev->dev, |
| 2934 | "device not accepting address %d, error %d\n", |
| 2935 | devnum, retval); |
| 2936 | goto fail; |
| 2937 | } |
| 2938 | if (udev->speed == USB_SPEED_SUPER) { |
| 2939 | devnum = udev->devnum; |
| 2940 | dev_info(&udev->dev, |
| 2941 | "%s SuperSpeed USB device number %d using %s\n", |
| 2942 | (udev->config) ? "reset" : "new", |
| 2943 | devnum, udev->bus->controller->driver->name); |
| 2944 | } |
| 2945 | |
| 2946 | /* cope with hardware quirkiness: |
| 2947 | * - let SET_ADDRESS settle, some device hardware wants it |
| 2948 | * - read ep0 maxpacket even for high and low speed, |
| 2949 | */ |
| 2950 | msleep(10); |
| 2951 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
| 2952 | break; |
| 2953 | } |
| 2954 | |
| 2955 | retval = usb_get_device_descriptor(udev, 8); |
| 2956 | if (retval < 8) { |
| 2957 | dev_err(&udev->dev, |
| 2958 | "device descriptor read/8, error %d\n", |
| 2959 | retval); |
| 2960 | if (retval >= 0) |
| 2961 | retval = -EMSGSIZE; |
| 2962 | } else { |
| 2963 | retval = 0; |
| 2964 | break; |
| 2965 | } |
| 2966 | } |
| 2967 | if (retval) |
| 2968 | goto fail; |
| 2969 | |
| 2970 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
| 2971 | udev->speed == USB_SPEED_SUPER) |
| 2972 | i = 512; |
| 2973 | else |
| 2974 | i = udev->descriptor.bMaxPacketSize0; |
| 2975 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
| 2976 | if (udev->speed == USB_SPEED_LOW || |
| 2977 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
| 2978 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
| 2979 | retval = -EMSGSIZE; |
| 2980 | goto fail; |
| 2981 | } |
| 2982 | if (udev->speed == USB_SPEED_FULL) |
| 2983 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 2984 | else |
| 2985 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); |
| 2986 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
| 2987 | usb_ep0_reinit(udev); |
| 2988 | } |
| 2989 | |
| 2990 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
| 2991 | if (retval < (signed)sizeof(udev->descriptor)) { |
| 2992 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
| 2993 | retval); |
| 2994 | if (retval >= 0) |
| 2995 | retval = -ENOMSG; |
| 2996 | goto fail; |
| 2997 | } |
| 2998 | |
| 2999 | retval = 0; |
| 3000 | /* notify HCD that we have a device connected and addressed */ |
| 3001 | if (hcd->driver->update_device) |
| 3002 | hcd->driver->update_device(hcd, udev); |
| 3003 | fail: |
| 3004 | if (retval) { |
| 3005 | hub_port_disable(hub, port1, 0); |
| 3006 | update_devnum(udev, devnum); /* for disconnect processing */ |
| 3007 | } |
| 3008 | mutex_unlock(&usb_address0_mutex); |
| 3009 | return retval; |
| 3010 | } |
| 3011 | |
| 3012 | static void |
| 3013 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) |
| 3014 | { |
| 3015 | struct usb_qualifier_descriptor *qual; |
| 3016 | int status; |
| 3017 | |
| 3018 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
| 3019 | if (qual == NULL) |
| 3020 | return; |
| 3021 | |
| 3022 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, |
| 3023 | qual, sizeof *qual); |
| 3024 | if (status == sizeof *qual) { |
| 3025 | dev_info(&udev->dev, "not running at top speed; " |
| 3026 | "connect to a high speed hub\n"); |
| 3027 | /* hub LEDs are probably harder to miss than syslog */ |
| 3028 | if (hub->has_indicators) { |
| 3029 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
| 3030 | schedule_delayed_work (&hub->leds, 0); |
| 3031 | } |
| 3032 | } |
| 3033 | kfree(qual); |
| 3034 | } |
| 3035 | |
| 3036 | static unsigned |
| 3037 | hub_power_remaining (struct usb_hub *hub) |
| 3038 | { |
| 3039 | struct usb_device *hdev = hub->hdev; |
| 3040 | int remaining; |
| 3041 | int port1; |
| 3042 | |
| 3043 | if (!hub->limited_power) |
| 3044 | return 0; |
| 3045 | |
| 3046 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
| 3047 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 3048 | struct usb_device *udev = hdev->children[port1 - 1]; |
| 3049 | int delta; |
| 3050 | |
| 3051 | if (!udev) |
| 3052 | continue; |
| 3053 | |
| 3054 | /* Unconfigured devices may not use more than 100mA, |
| 3055 | * or 8mA for OTG ports */ |
| 3056 | if (udev->actconfig) |
| 3057 | delta = udev->actconfig->desc.bMaxPower * 2; |
| 3058 | else if (port1 != udev->bus->otg_port || hdev->parent) |
| 3059 | delta = 100; |
| 3060 | else |
| 3061 | delta = 8; |
| 3062 | if (delta > hub->mA_per_port) |
| 3063 | dev_warn(&udev->dev, |
| 3064 | "%dmA is over %umA budget for port %d!\n", |
| 3065 | delta, hub->mA_per_port, port1); |
| 3066 | remaining -= delta; |
| 3067 | } |
| 3068 | if (remaining < 0) { |
| 3069 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
| 3070 | - remaining); |
| 3071 | remaining = 0; |
| 3072 | } |
| 3073 | return remaining; |
| 3074 | } |
| 3075 | |
| 3076 | /* Handle physical or logical connection change events. |
| 3077 | * This routine is called when: |
| 3078 | * a port connection-change occurs; |
| 3079 | * a port enable-change occurs (often caused by EMI); |
| 3080 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
| 3081 | * a firmware download) |
| 3082 | * caller already locked the hub |
| 3083 | */ |
| 3084 | static void hub_port_connect_change(struct usb_hub *hub, int port1, |
| 3085 | u16 portstatus, u16 portchange) |
| 3086 | { |
| 3087 | struct usb_device *hdev = hub->hdev; |
| 3088 | struct device *hub_dev = hub->intfdev; |
| 3089 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
| 3090 | unsigned wHubCharacteristics = |
| 3091 | le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| 3092 | struct usb_device *udev; |
| 3093 | int status, i; |
| 3094 | |
| 3095 | dev_dbg (hub_dev, |
| 3096 | "port %d, status %04x, change %04x, %s\n", |
| 3097 | port1, portstatus, portchange, portspeed(hub, portstatus)); |
| 3098 | |
| 3099 | if (hub->has_indicators) { |
| 3100 | set_port_led(hub, port1, HUB_LED_AUTO); |
| 3101 | hub->indicator[port1-1] = INDICATOR_AUTO; |
| 3102 | } |
| 3103 | |
| 3104 | #ifdef CONFIG_USB_OTG |
| 3105 | /* during HNP, don't repeat the debounce */ |
| 3106 | if (hdev->bus->is_b_host) |
| 3107 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
| 3108 | USB_PORT_STAT_C_ENABLE); |
| 3109 | #endif |
| 3110 | |
| 3111 | /* Try to resuscitate an existing device */ |
| 3112 | udev = hdev->children[port1-1]; |
| 3113 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
| 3114 | udev->state != USB_STATE_NOTATTACHED) { |
| 3115 | usb_lock_device(udev); |
| 3116 | if (portstatus & USB_PORT_STAT_ENABLE) { |
| 3117 | status = 0; /* Nothing to do */ |
| 3118 | |
| 3119 | #ifdef CONFIG_USB_SUSPEND |
| 3120 | } else if (udev->state == USB_STATE_SUSPENDED && |
| 3121 | udev->persist_enabled) { |
| 3122 | /* For a suspended device, treat this as a |
| 3123 | * remote wakeup event. |
| 3124 | */ |
| 3125 | status = usb_remote_wakeup(udev); |
| 3126 | #endif |
| 3127 | |
| 3128 | } else { |
| 3129 | status = -ENODEV; /* Don't resuscitate */ |
| 3130 | } |
| 3131 | usb_unlock_device(udev); |
| 3132 | |
| 3133 | if (status == 0) { |
| 3134 | clear_bit(port1, hub->change_bits); |
| 3135 | return; |
| 3136 | } |
| 3137 | } |
| 3138 | |
| 3139 | /* Disconnect any existing devices under this port */ |
| 3140 | if (udev) |
| 3141 | usb_disconnect(&hdev->children[port1-1]); |
| 3142 | clear_bit(port1, hub->change_bits); |
| 3143 | |
| 3144 | /* We can forget about a "removed" device when there's a physical |
| 3145 | * disconnect or the connect status changes. |
| 3146 | */ |
| 3147 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 3148 | (portchange & USB_PORT_STAT_C_CONNECTION)) |
| 3149 | clear_bit(port1, hub->removed_bits); |
| 3150 | |
| 3151 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
| 3152 | USB_PORT_STAT_C_ENABLE)) { |
| 3153 | status = hub_port_debounce(hub, port1); |
| 3154 | if (status < 0) { |
| 3155 | if (printk_ratelimit()) |
| 3156 | dev_err(hub_dev, "connect-debounce failed, " |
| 3157 | "port %d disabled\n", port1); |
| 3158 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
| 3159 | } else { |
| 3160 | portstatus = status; |
| 3161 | } |
| 3162 | } |
| 3163 | |
| 3164 | /* Return now if debouncing failed or nothing is connected or |
| 3165 | * the device was "removed". |
| 3166 | */ |
| 3167 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 3168 | test_bit(port1, hub->removed_bits)) { |
| 3169 | |
| 3170 | /* maybe switch power back on (e.g. root hub was reset) */ |
| 3171 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
| 3172 | && !port_is_power_on(hub, portstatus)) |
| 3173 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| 3174 | |
| 3175 | if (portstatus & USB_PORT_STAT_ENABLE) |
| 3176 | goto done; |
| 3177 | return; |
| 3178 | } |
| 3179 | |
| 3180 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
| 3181 | |
| 3182 | /* reallocate for each attempt, since references |
| 3183 | * to the previous one can escape in various ways |
| 3184 | */ |
| 3185 | udev = usb_alloc_dev(hdev, hdev->bus, port1); |
| 3186 | if (!udev) { |
| 3187 | dev_err (hub_dev, |
| 3188 | "couldn't allocate port %d usb_device\n", |
| 3189 | port1); |
| 3190 | goto done; |
| 3191 | } |
| 3192 | |
| 3193 | usb_set_device_state(udev, USB_STATE_POWERED); |
| 3194 | udev->bus_mA = hub->mA_per_port; |
| 3195 | udev->level = hdev->level + 1; |
| 3196 | udev->wusb = hub_is_wusb(hub); |
| 3197 | |
| 3198 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
| 3199 | if (hub_is_superspeed(hub->hdev)) |
| 3200 | udev->speed = USB_SPEED_SUPER; |
| 3201 | else |
| 3202 | udev->speed = USB_SPEED_UNKNOWN; |
| 3203 | |
| 3204 | choose_devnum(udev); |
| 3205 | if (udev->devnum <= 0) { |
| 3206 | status = -ENOTCONN; /* Don't retry */ |
| 3207 | goto loop; |
| 3208 | } |
| 3209 | |
| 3210 | /* reset (non-USB 3.0 devices) and get descriptor */ |
| 3211 | status = hub_port_init(hub, udev, port1, i); |
| 3212 | if (status < 0) |
| 3213 | goto loop; |
| 3214 | |
| 3215 | usb_detect_quirks(udev); |
| 3216 | if (udev->quirks & USB_QUIRK_DELAY_INIT) |
| 3217 | msleep(1000); |
| 3218 | |
| 3219 | /* consecutive bus-powered hubs aren't reliable; they can |
| 3220 | * violate the voltage drop budget. if the new child has |
| 3221 | * a "powered" LED, users should notice we didn't enable it |
| 3222 | * (without reading syslog), even without per-port LEDs |
| 3223 | * on the parent. |
| 3224 | */ |
| 3225 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
| 3226 | && udev->bus_mA <= 100) { |
| 3227 | u16 devstat; |
| 3228 | |
| 3229 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, |
| 3230 | &devstat); |
| 3231 | if (status < 2) { |
| 3232 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
| 3233 | goto loop_disable; |
| 3234 | } |
| 3235 | le16_to_cpus(&devstat); |
| 3236 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| 3237 | dev_err(&udev->dev, |
| 3238 | "can't connect bus-powered hub " |
| 3239 | "to this port\n"); |
| 3240 | if (hub->has_indicators) { |
| 3241 | hub->indicator[port1-1] = |
| 3242 | INDICATOR_AMBER_BLINK; |
| 3243 | schedule_delayed_work (&hub->leds, 0); |
| 3244 | } |
| 3245 | status = -ENOTCONN; /* Don't retry */ |
| 3246 | goto loop_disable; |
| 3247 | } |
| 3248 | } |
| 3249 | |
| 3250 | /* check for devices running slower than they could */ |
| 3251 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
| 3252 | && udev->speed == USB_SPEED_FULL |
| 3253 | && highspeed_hubs != 0) |
| 3254 | check_highspeed (hub, udev, port1); |
| 3255 | |
| 3256 | /* Store the parent's children[] pointer. At this point |
| 3257 | * udev becomes globally accessible, although presumably |
| 3258 | * no one will look at it until hdev is unlocked. |
| 3259 | */ |
| 3260 | status = 0; |
| 3261 | |
| 3262 | /* We mustn't add new devices if the parent hub has |
| 3263 | * been disconnected; we would race with the |
| 3264 | * recursively_mark_NOTATTACHED() routine. |
| 3265 | */ |
| 3266 | spin_lock_irq(&device_state_lock); |
| 3267 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 3268 | status = -ENOTCONN; |
| 3269 | else |
| 3270 | hdev->children[port1-1] = udev; |
| 3271 | spin_unlock_irq(&device_state_lock); |
| 3272 | |
| 3273 | /* Run it through the hoops (find a driver, etc) */ |
| 3274 | if (!status) { |
| 3275 | status = usb_new_device(udev); |
| 3276 | if (status) { |
| 3277 | spin_lock_irq(&device_state_lock); |
| 3278 | hdev->children[port1-1] = NULL; |
| 3279 | spin_unlock_irq(&device_state_lock); |
| 3280 | } |
| 3281 | } |
| 3282 | |
| 3283 | if (status) |
| 3284 | goto loop_disable; |
| 3285 | |
| 3286 | status = hub_power_remaining(hub); |
| 3287 | if (status) |
| 3288 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
| 3289 | |
| 3290 | return; |
| 3291 | |
| 3292 | loop_disable: |
| 3293 | hub_port_disable(hub, port1, 1); |
| 3294 | loop: |
| 3295 | usb_ep0_reinit(udev); |
| 3296 | release_devnum(udev); |
| 3297 | hub_free_dev(udev); |
| 3298 | usb_put_dev(udev); |
| 3299 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
| 3300 | break; |
| 3301 | } |
| 3302 | if (hub->hdev->parent || |
| 3303 | !hcd->driver->port_handed_over || |
| 3304 | !(hcd->driver->port_handed_over)(hcd, port1)) |
| 3305 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", |
| 3306 | port1); |
| 3307 | |
| 3308 | done: |
| 3309 | hub_port_disable(hub, port1, 1); |
| 3310 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
| 3311 | hcd->driver->relinquish_port(hcd, port1); |
| 3312 | } |
| 3313 | |
| 3314 | static void hub_events(void) |
| 3315 | { |
| 3316 | struct list_head *tmp; |
| 3317 | struct usb_device *hdev; |
| 3318 | struct usb_interface *intf; |
| 3319 | struct usb_hub *hub; |
| 3320 | struct device *hub_dev; |
| 3321 | u16 hubstatus; |
| 3322 | u16 hubchange; |
| 3323 | u16 portstatus; |
| 3324 | u16 portchange; |
| 3325 | int i, ret; |
| 3326 | int connect_change; |
| 3327 | |
| 3328 | /* |
| 3329 | * We restart the list every time to avoid a deadlock with |
| 3330 | * deleting hubs downstream from this one. This should be |
| 3331 | * safe since we delete the hub from the event list. |
| 3332 | * Not the most efficient, but avoids deadlocks. |
| 3333 | */ |
| 3334 | while (1) { |
| 3335 | |
| 3336 | /* Grab the first entry at the beginning of the list */ |
| 3337 | spin_lock_irq(&hub_event_lock); |
| 3338 | if (list_empty(&hub_event_list)) { |
| 3339 | spin_unlock_irq(&hub_event_lock); |
| 3340 | break; |
| 3341 | } |
| 3342 | |
| 3343 | tmp = hub_event_list.next; |
| 3344 | list_del_init(tmp); |
| 3345 | |
| 3346 | hub = list_entry(tmp, struct usb_hub, event_list); |
| 3347 | kref_get(&hub->kref); |
| 3348 | spin_unlock_irq(&hub_event_lock); |
| 3349 | |
| 3350 | hdev = hub->hdev; |
| 3351 | hub_dev = hub->intfdev; |
| 3352 | intf = to_usb_interface(hub_dev); |
| 3353 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
| 3354 | hdev->state, hub->descriptor |
| 3355 | ? hub->descriptor->bNbrPorts |
| 3356 | : 0, |
| 3357 | /* NOTE: expects max 15 ports... */ |
| 3358 | (u16) hub->change_bits[0], |
| 3359 | (u16) hub->event_bits[0]); |
| 3360 | |
| 3361 | /* Lock the device, then check to see if we were |
| 3362 | * disconnected while waiting for the lock to succeed. */ |
| 3363 | usb_lock_device(hdev); |
| 3364 | if (unlikely(hub->disconnected)) |
| 3365 | goto loop_disconnected; |
| 3366 | |
| 3367 | /* If the hub has died, clean up after it */ |
| 3368 | if (hdev->state == USB_STATE_NOTATTACHED) { |
| 3369 | hub->error = -ENODEV; |
| 3370 | hub_quiesce(hub, HUB_DISCONNECT); |
| 3371 | goto loop; |
| 3372 | } |
| 3373 | |
| 3374 | /* Autoresume */ |
| 3375 | ret = usb_autopm_get_interface(intf); |
| 3376 | if (ret) { |
| 3377 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); |
| 3378 | goto loop; |
| 3379 | } |
| 3380 | |
| 3381 | /* If this is an inactive hub, do nothing */ |
| 3382 | if (hub->quiescing) |
| 3383 | goto loop_autopm; |
| 3384 | |
| 3385 | if (hub->error) { |
| 3386 | dev_dbg (hub_dev, "resetting for error %d\n", |
| 3387 | hub->error); |
| 3388 | |
| 3389 | ret = usb_reset_device(hdev); |
| 3390 | if (ret) { |
| 3391 | dev_dbg (hub_dev, |
| 3392 | "error resetting hub: %d\n", ret); |
| 3393 | goto loop_autopm; |
| 3394 | } |
| 3395 | |
| 3396 | hub->nerrors = 0; |
| 3397 | hub->error = 0; |
| 3398 | } |
| 3399 | |
| 3400 | /* deal with port status changes */ |
| 3401 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { |
| 3402 | if (test_bit(i, hub->busy_bits)) |
| 3403 | continue; |
| 3404 | connect_change = test_bit(i, hub->change_bits); |
| 3405 | if (!test_and_clear_bit(i, hub->event_bits) && |
| 3406 | !connect_change) |
| 3407 | continue; |
| 3408 | |
| 3409 | ret = hub_port_status(hub, i, |
| 3410 | &portstatus, &portchange); |
| 3411 | if (ret < 0) |
| 3412 | continue; |
| 3413 | |
| 3414 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 3415 | clear_port_feature(hdev, i, |
| 3416 | USB_PORT_FEAT_C_CONNECTION); |
| 3417 | connect_change = 1; |
| 3418 | } |
| 3419 | |
| 3420 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 3421 | if (!connect_change) |
| 3422 | dev_dbg (hub_dev, |
| 3423 | "port %d enable change, " |
| 3424 | "status %08x\n", |
| 3425 | i, portstatus); |
| 3426 | clear_port_feature(hdev, i, |
| 3427 | USB_PORT_FEAT_C_ENABLE); |
| 3428 | |
| 3429 | /* |
| 3430 | * EM interference sometimes causes badly |
| 3431 | * shielded USB devices to be shutdown by |
| 3432 | * the hub, this hack enables them again. |
| 3433 | * Works at least with mouse driver. |
| 3434 | */ |
| 3435 | if (!(portstatus & USB_PORT_STAT_ENABLE) |
| 3436 | && !connect_change |
| 3437 | && hdev->children[i-1]) { |
| 3438 | dev_err (hub_dev, |
| 3439 | "port %i " |
| 3440 | "disabled by hub (EMI?), " |
| 3441 | "re-enabling...\n", |
| 3442 | i); |
| 3443 | connect_change = 1; |
| 3444 | } |
| 3445 | } |
| 3446 | |
| 3447 | if (portchange & USB_PORT_STAT_C_SUSPEND) { |
| 3448 | struct usb_device *udev; |
| 3449 | |
| 3450 | clear_port_feature(hdev, i, |
| 3451 | USB_PORT_FEAT_C_SUSPEND); |
| 3452 | udev = hdev->children[i-1]; |
| 3453 | if (udev) { |
| 3454 | /* TRSMRCY = 10 msec */ |
| 3455 | msleep(10); |
| 3456 | |
| 3457 | usb_lock_device(udev); |
| 3458 | ret = usb_remote_wakeup(hdev-> |
| 3459 | children[i-1]); |
| 3460 | usb_unlock_device(udev); |
| 3461 | if (ret < 0) |
| 3462 | connect_change = 1; |
| 3463 | } else { |
| 3464 | ret = -ENODEV; |
| 3465 | hub_port_disable(hub, i, 1); |
| 3466 | } |
| 3467 | dev_dbg (hub_dev, |
| 3468 | "resume on port %d, status %d\n", |
| 3469 | i, ret); |
| 3470 | } |
| 3471 | |
| 3472 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
| 3473 | u16 status = 0; |
| 3474 | u16 unused; |
| 3475 | |
| 3476 | dev_dbg(hub_dev, "over-current change on port " |
| 3477 | "%d\n", i); |
| 3478 | clear_port_feature(hdev, i, |
| 3479 | USB_PORT_FEAT_C_OVER_CURRENT); |
| 3480 | msleep(100); /* Cool down */ |
| 3481 | hub_power_on(hub, true); |
| 3482 | hub_port_status(hub, i, &status, &unused); |
| 3483 | if (status & USB_PORT_STAT_OVERCURRENT) |
| 3484 | dev_err(hub_dev, "over-current " |
| 3485 | "condition on port %d\n", i); |
| 3486 | } |
| 3487 | |
| 3488 | if (portchange & USB_PORT_STAT_C_RESET) { |
| 3489 | dev_dbg (hub_dev, |
| 3490 | "reset change on port %d\n", |
| 3491 | i); |
| 3492 | clear_port_feature(hdev, i, |
| 3493 | USB_PORT_FEAT_C_RESET); |
| 3494 | } |
| 3495 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
| 3496 | hub_is_superspeed(hub->hdev)) { |
| 3497 | dev_dbg(hub_dev, |
| 3498 | "warm reset change on port %d\n", |
| 3499 | i); |
| 3500 | clear_port_feature(hdev, i, |
| 3501 | USB_PORT_FEAT_C_BH_PORT_RESET); |
| 3502 | } |
| 3503 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
| 3504 | clear_port_feature(hub->hdev, i, |
| 3505 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
| 3506 | } |
| 3507 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { |
| 3508 | dev_warn(hub_dev, |
| 3509 | "config error on port %d\n", |
| 3510 | i); |
| 3511 | clear_port_feature(hub->hdev, i, |
| 3512 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
| 3513 | } |
| 3514 | |
| 3515 | if (connect_change) |
| 3516 | hub_port_connect_change(hub, i, |
| 3517 | portstatus, portchange); |
| 3518 | } /* end for i */ |
| 3519 | |
| 3520 | /* deal with hub status changes */ |
| 3521 | if (test_and_clear_bit(0, hub->event_bits) == 0) |
| 3522 | ; /* do nothing */ |
| 3523 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
| 3524 | dev_err (hub_dev, "get_hub_status failed\n"); |
| 3525 | else { |
| 3526 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
| 3527 | dev_dbg (hub_dev, "power change\n"); |
| 3528 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
| 3529 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 3530 | /* FIXME: Is this always true? */ |
| 3531 | hub->limited_power = 1; |
| 3532 | else |
| 3533 | hub->limited_power = 0; |
| 3534 | } |
| 3535 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
| 3536 | u16 status = 0; |
| 3537 | u16 unused; |
| 3538 | |
| 3539 | dev_dbg(hub_dev, "over-current change\n"); |
| 3540 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
| 3541 | msleep(500); /* Cool down */ |
| 3542 | hub_power_on(hub, true); |
| 3543 | hub_hub_status(hub, &status, &unused); |
| 3544 | if (status & HUB_STATUS_OVERCURRENT) |
| 3545 | dev_err(hub_dev, "over-current " |
| 3546 | "condition\n"); |
| 3547 | } |
| 3548 | } |
| 3549 | |
| 3550 | loop_autopm: |
| 3551 | /* Balance the usb_autopm_get_interface() above */ |
| 3552 | usb_autopm_put_interface_no_suspend(intf); |
| 3553 | loop: |
| 3554 | /* Balance the usb_autopm_get_interface_no_resume() in |
| 3555 | * kick_khubd() and allow autosuspend. |
| 3556 | */ |
| 3557 | usb_autopm_put_interface(intf); |
| 3558 | loop_disconnected: |
| 3559 | usb_unlock_device(hdev); |
| 3560 | kref_put(&hub->kref, hub_release); |
| 3561 | |
| 3562 | } /* end while (1) */ |
| 3563 | } |
| 3564 | |
| 3565 | static int hub_thread(void *__unused) |
| 3566 | { |
| 3567 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
| 3568 | * port handover. Otherwise it might see that a full-speed device |
| 3569 | * was gone before the EHCI controller had handed its port over to |
| 3570 | * the companion full-speed controller. |
| 3571 | */ |
| 3572 | set_freezable(); |
| 3573 | |
| 3574 | do { |
| 3575 | hub_events(); |
| 3576 | wait_event_freezable(khubd_wait, |
| 3577 | !list_empty(&hub_event_list) || |
| 3578 | kthread_should_stop()); |
| 3579 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
| 3580 | |
| 3581 | pr_debug("%s: khubd exiting\n", usbcore_name); |
| 3582 | return 0; |
| 3583 | } |
| 3584 | |
| 3585 | static const struct usb_device_id hub_id_table[] = { |
| 3586 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
| 3587 | .bDeviceClass = USB_CLASS_HUB}, |
| 3588 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
| 3589 | .bInterfaceClass = USB_CLASS_HUB}, |
| 3590 | { } /* Terminating entry */ |
| 3591 | }; |
| 3592 | |
| 3593 | MODULE_DEVICE_TABLE (usb, hub_id_table); |
| 3594 | |
| 3595 | static struct usb_driver hub_driver = { |
| 3596 | .name = "hub", |
| 3597 | .probe = hub_probe, |
| 3598 | .disconnect = hub_disconnect, |
| 3599 | .suspend = hub_suspend, |
| 3600 | .resume = hub_resume, |
| 3601 | .reset_resume = hub_reset_resume, |
| 3602 | .pre_reset = hub_pre_reset, |
| 3603 | .post_reset = hub_post_reset, |
| 3604 | .unlocked_ioctl = hub_ioctl, |
| 3605 | .id_table = hub_id_table, |
| 3606 | .supports_autosuspend = 1, |
| 3607 | }; |
| 3608 | |
| 3609 | int usb_hub_init(void) |
| 3610 | { |
| 3611 | if (usb_register(&hub_driver) < 0) { |
| 3612 | printk(KERN_ERR "%s: can't register hub driver\n", |
| 3613 | usbcore_name); |
| 3614 | return -1; |
| 3615 | } |
| 3616 | |
| 3617 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
| 3618 | if (!IS_ERR(khubd_task)) |
| 3619 | return 0; |
| 3620 | |
| 3621 | /* Fall through if kernel_thread failed */ |
| 3622 | usb_deregister(&hub_driver); |
| 3623 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); |
| 3624 | |
| 3625 | return -1; |
| 3626 | } |
| 3627 | |
| 3628 | void usb_hub_cleanup(void) |
| 3629 | { |
| 3630 | kthread_stop(khubd_task); |
| 3631 | |
| 3632 | /* |
| 3633 | * Hub resources are freed for us by usb_deregister. It calls |
| 3634 | * usb_driver_purge on every device which in turn calls that |
| 3635 | * devices disconnect function if it is using this driver. |
| 3636 | * The hub_disconnect function takes care of releasing the |
| 3637 | * individual hub resources. -greg |
| 3638 | */ |
| 3639 | usb_deregister(&hub_driver); |
| 3640 | } /* usb_hub_cleanup() */ |
| 3641 | |
| 3642 | static int descriptors_changed(struct usb_device *udev, |
| 3643 | struct usb_device_descriptor *old_device_descriptor) |
| 3644 | { |
| 3645 | int changed = 0; |
| 3646 | unsigned index; |
| 3647 | unsigned serial_len = 0; |
| 3648 | unsigned len; |
| 3649 | unsigned old_length; |
| 3650 | int length; |
| 3651 | char *buf; |
| 3652 | |
| 3653 | if (memcmp(&udev->descriptor, old_device_descriptor, |
| 3654 | sizeof(*old_device_descriptor)) != 0) |
| 3655 | return 1; |
| 3656 | |
| 3657 | /* Since the idVendor, idProduct, and bcdDevice values in the |
| 3658 | * device descriptor haven't changed, we will assume the |
| 3659 | * Manufacturer and Product strings haven't changed either. |
| 3660 | * But the SerialNumber string could be different (e.g., a |
| 3661 | * different flash card of the same brand). |
| 3662 | */ |
| 3663 | if (udev->serial) |
| 3664 | serial_len = strlen(udev->serial) + 1; |
| 3665 | |
| 3666 | len = serial_len; |
| 3667 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| 3668 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 3669 | len = max(len, old_length); |
| 3670 | } |
| 3671 | |
| 3672 | buf = kmalloc(len, GFP_NOIO); |
| 3673 | if (buf == NULL) { |
| 3674 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); |
| 3675 | /* assume the worst */ |
| 3676 | return 1; |
| 3677 | } |
| 3678 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| 3679 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 3680 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
| 3681 | old_length); |
| 3682 | if (length != old_length) { |
| 3683 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
| 3684 | index, length); |
| 3685 | changed = 1; |
| 3686 | break; |
| 3687 | } |
| 3688 | if (memcmp (buf, udev->rawdescriptors[index], old_length) |
| 3689 | != 0) { |
| 3690 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
| 3691 | index, |
| 3692 | ((struct usb_config_descriptor *) buf)-> |
| 3693 | bConfigurationValue); |
| 3694 | changed = 1; |
| 3695 | break; |
| 3696 | } |
| 3697 | } |
| 3698 | |
| 3699 | if (!changed && serial_len) { |
| 3700 | length = usb_string(udev, udev->descriptor.iSerialNumber, |
| 3701 | buf, serial_len); |
| 3702 | if (length + 1 != serial_len) { |
| 3703 | dev_dbg(&udev->dev, "serial string error %d\n", |
| 3704 | length); |
| 3705 | changed = 1; |
| 3706 | } else if (memcmp(buf, udev->serial, length) != 0) { |
| 3707 | dev_dbg(&udev->dev, "serial string changed\n"); |
| 3708 | changed = 1; |
| 3709 | } |
| 3710 | } |
| 3711 | |
| 3712 | kfree(buf); |
| 3713 | return changed; |
| 3714 | } |
| 3715 | |
| 3716 | /** |
| 3717 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
| 3718 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 3719 | * |
| 3720 | * WARNING - don't use this routine to reset a composite device |
| 3721 | * (one with multiple interfaces owned by separate drivers)! |
| 3722 | * Use usb_reset_device() instead. |
| 3723 | * |
| 3724 | * Do a port reset, reassign the device's address, and establish its |
| 3725 | * former operating configuration. If the reset fails, or the device's |
| 3726 | * descriptors change from their values before the reset, or the original |
| 3727 | * configuration and altsettings cannot be restored, a flag will be set |
| 3728 | * telling khubd to pretend the device has been disconnected and then |
| 3729 | * re-connected. All drivers will be unbound, and the device will be |
| 3730 | * re-enumerated and probed all over again. |
| 3731 | * |
| 3732 | * Returns 0 if the reset succeeded, -ENODEV if the device has been |
| 3733 | * flagged for logical disconnection, or some other negative error code |
| 3734 | * if the reset wasn't even attempted. |
| 3735 | * |
| 3736 | * The caller must own the device lock. For example, it's safe to use |
| 3737 | * this from a driver probe() routine after downloading new firmware. |
| 3738 | * For calls that might not occur during probe(), drivers should lock |
| 3739 | * the device using usb_lock_device_for_reset(). |
| 3740 | * |
| 3741 | * Locking exception: This routine may also be called from within an |
| 3742 | * autoresume handler. Such usage won't conflict with other tasks |
| 3743 | * holding the device lock because these tasks should always call |
| 3744 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. |
| 3745 | */ |
| 3746 | static int usb_reset_and_verify_device(struct usb_device *udev) |
| 3747 | { |
| 3748 | struct usb_device *parent_hdev = udev->parent; |
| 3749 | struct usb_hub *parent_hub; |
| 3750 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 3751 | struct usb_device_descriptor descriptor = udev->descriptor; |
| 3752 | int i, ret = 0; |
| 3753 | int port1 = udev->portnum; |
| 3754 | |
| 3755 | if (udev->state == USB_STATE_NOTATTACHED || |
| 3756 | udev->state == USB_STATE_SUSPENDED) { |
| 3757 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 3758 | udev->state); |
| 3759 | return -EINVAL; |
| 3760 | } |
| 3761 | |
| 3762 | if (!parent_hdev) { |
| 3763 | /* this requires hcd-specific logic; see ohci_restart() */ |
| 3764 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
| 3765 | return -EISDIR; |
| 3766 | } |
| 3767 | parent_hub = hdev_to_hub(parent_hdev); |
| 3768 | |
| 3769 | set_bit(port1, parent_hub->busy_bits); |
| 3770 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
| 3771 | |
| 3772 | /* ep0 maxpacket size may change; let the HCD know about it. |
| 3773 | * Other endpoints will be handled by re-enumeration. */ |
| 3774 | usb_ep0_reinit(udev); |
| 3775 | ret = hub_port_init(parent_hub, udev, port1, i); |
| 3776 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
| 3777 | break; |
| 3778 | } |
| 3779 | clear_bit(port1, parent_hub->busy_bits); |
| 3780 | |
| 3781 | if (ret < 0) |
| 3782 | goto re_enumerate; |
| 3783 | |
| 3784 | /* Device might have changed firmware (DFU or similar) */ |
| 3785 | if (descriptors_changed(udev, &descriptor)) { |
| 3786 | dev_info(&udev->dev, "device firmware changed\n"); |
| 3787 | udev->descriptor = descriptor; /* for disconnect() calls */ |
| 3788 | goto re_enumerate; |
| 3789 | } |
| 3790 | |
| 3791 | /* Restore the device's previous configuration */ |
| 3792 | if (!udev->actconfig) |
| 3793 | goto done; |
| 3794 | |
| 3795 | mutex_lock(hcd->bandwidth_mutex); |
| 3796 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
| 3797 | if (ret < 0) { |
| 3798 | dev_warn(&udev->dev, |
| 3799 | "Busted HC? Not enough HCD resources for " |
| 3800 | "old configuration.\n"); |
| 3801 | mutex_unlock(hcd->bandwidth_mutex); |
| 3802 | goto re_enumerate; |
| 3803 | } |
| 3804 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3805 | USB_REQ_SET_CONFIGURATION, 0, |
| 3806 | udev->actconfig->desc.bConfigurationValue, 0, |
| 3807 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 3808 | if (ret < 0) { |
| 3809 | dev_err(&udev->dev, |
| 3810 | "can't restore configuration #%d (error=%d)\n", |
| 3811 | udev->actconfig->desc.bConfigurationValue, ret); |
| 3812 | mutex_unlock(hcd->bandwidth_mutex); |
| 3813 | goto re_enumerate; |
| 3814 | } |
| 3815 | mutex_unlock(hcd->bandwidth_mutex); |
| 3816 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
| 3817 | |
| 3818 | /* Put interfaces back into the same altsettings as before. |
| 3819 | * Don't bother to send the Set-Interface request for interfaces |
| 3820 | * that were already in altsetting 0; besides being unnecessary, |
| 3821 | * many devices can't handle it. Instead just reset the host-side |
| 3822 | * endpoint state. |
| 3823 | */ |
| 3824 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 3825 | struct usb_host_config *config = udev->actconfig; |
| 3826 | struct usb_interface *intf = config->interface[i]; |
| 3827 | struct usb_interface_descriptor *desc; |
| 3828 | |
| 3829 | desc = &intf->cur_altsetting->desc; |
| 3830 | if (desc->bAlternateSetting == 0) { |
| 3831 | usb_disable_interface(udev, intf, true); |
| 3832 | usb_enable_interface(udev, intf, true); |
| 3833 | ret = 0; |
| 3834 | } else { |
| 3835 | /* Let the bandwidth allocation function know that this |
| 3836 | * device has been reset, and it will have to use |
| 3837 | * alternate setting 0 as the current alternate setting. |
| 3838 | */ |
| 3839 | intf->resetting_device = 1; |
| 3840 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
| 3841 | desc->bAlternateSetting); |
| 3842 | intf->resetting_device = 0; |
| 3843 | } |
| 3844 | if (ret < 0) { |
| 3845 | dev_err(&udev->dev, "failed to restore interface %d " |
| 3846 | "altsetting %d (error=%d)\n", |
| 3847 | desc->bInterfaceNumber, |
| 3848 | desc->bAlternateSetting, |
| 3849 | ret); |
| 3850 | goto re_enumerate; |
| 3851 | } |
| 3852 | } |
| 3853 | |
| 3854 | done: |
| 3855 | return 0; |
| 3856 | |
| 3857 | re_enumerate: |
| 3858 | hub_port_logical_disconnect(parent_hub, port1); |
| 3859 | return -ENODEV; |
| 3860 | } |
| 3861 | |
| 3862 | /** |
| 3863 | * usb_reset_device - warn interface drivers and perform a USB port reset |
| 3864 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 3865 | * |
| 3866 | * Warns all drivers bound to registered interfaces (using their pre_reset |
| 3867 | * method), performs the port reset, and then lets the drivers know that |
| 3868 | * the reset is over (using their post_reset method). |
| 3869 | * |
| 3870 | * Return value is the same as for usb_reset_and_verify_device(). |
| 3871 | * |
| 3872 | * The caller must own the device lock. For example, it's safe to use |
| 3873 | * this from a driver probe() routine after downloading new firmware. |
| 3874 | * For calls that might not occur during probe(), drivers should lock |
| 3875 | * the device using usb_lock_device_for_reset(). |
| 3876 | * |
| 3877 | * If an interface is currently being probed or disconnected, we assume |
| 3878 | * its driver knows how to handle resets. For all other interfaces, |
| 3879 | * if the driver doesn't have pre_reset and post_reset methods then |
| 3880 | * we attempt to unbind it and rebind afterward. |
| 3881 | */ |
| 3882 | int usb_reset_device(struct usb_device *udev) |
| 3883 | { |
| 3884 | int ret; |
| 3885 | int i; |
| 3886 | struct usb_host_config *config = udev->actconfig; |
| 3887 | |
| 3888 | if (udev->state == USB_STATE_NOTATTACHED || |
| 3889 | udev->state == USB_STATE_SUSPENDED) { |
| 3890 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 3891 | udev->state); |
| 3892 | return -EINVAL; |
| 3893 | } |
| 3894 | |
| 3895 | /* Prevent autosuspend during the reset */ |
| 3896 | usb_autoresume_device(udev); |
| 3897 | |
| 3898 | if (config) { |
| 3899 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
| 3900 | struct usb_interface *cintf = config->interface[i]; |
| 3901 | struct usb_driver *drv; |
| 3902 | int unbind = 0; |
| 3903 | |
| 3904 | if (cintf->dev.driver) { |
| 3905 | drv = to_usb_driver(cintf->dev.driver); |
| 3906 | if (drv->pre_reset && drv->post_reset) |
| 3907 | unbind = (drv->pre_reset)(cintf); |
| 3908 | else if (cintf->condition == |
| 3909 | USB_INTERFACE_BOUND) |
| 3910 | unbind = 1; |
| 3911 | if (unbind) |
| 3912 | usb_forced_unbind_intf(cintf); |
| 3913 | } |
| 3914 | } |
| 3915 | } |
| 3916 | |
| 3917 | ret = usb_reset_and_verify_device(udev); |
| 3918 | |
| 3919 | if (config) { |
| 3920 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
| 3921 | struct usb_interface *cintf = config->interface[i]; |
| 3922 | struct usb_driver *drv; |
| 3923 | int rebind = cintf->needs_binding; |
| 3924 | |
| 3925 | if (!rebind && cintf->dev.driver) { |
| 3926 | drv = to_usb_driver(cintf->dev.driver); |
| 3927 | if (drv->post_reset) |
| 3928 | rebind = (drv->post_reset)(cintf); |
| 3929 | else if (cintf->condition == |
| 3930 | USB_INTERFACE_BOUND) |
| 3931 | rebind = 1; |
| 3932 | } |
| 3933 | if (ret == 0 && rebind) |
| 3934 | usb_rebind_intf(cintf); |
| 3935 | } |
| 3936 | } |
| 3937 | |
| 3938 | usb_autosuspend_device(udev); |
| 3939 | return ret; |
| 3940 | } |
| 3941 | EXPORT_SYMBOL_GPL(usb_reset_device); |
| 3942 | |
| 3943 | |
| 3944 | /** |
| 3945 | * usb_queue_reset_device - Reset a USB device from an atomic context |
| 3946 | * @iface: USB interface belonging to the device to reset |
| 3947 | * |
| 3948 | * This function can be used to reset a USB device from an atomic |
| 3949 | * context, where usb_reset_device() won't work (as it blocks). |
| 3950 | * |
| 3951 | * Doing a reset via this method is functionally equivalent to calling |
| 3952 | * usb_reset_device(), except for the fact that it is delayed to a |
| 3953 | * workqueue. This means that any drivers bound to other interfaces |
| 3954 | * might be unbound, as well as users from usbfs in user space. |
| 3955 | * |
| 3956 | * Corner cases: |
| 3957 | * |
| 3958 | * - Scheduling two resets at the same time from two different drivers |
| 3959 | * attached to two different interfaces of the same device is |
| 3960 | * possible; depending on how the driver attached to each interface |
| 3961 | * handles ->pre_reset(), the second reset might happen or not. |
| 3962 | * |
| 3963 | * - If a driver is unbound and it had a pending reset, the reset will |
| 3964 | * be cancelled. |
| 3965 | * |
| 3966 | * - This function can be called during .probe() or .disconnect() |
| 3967 | * times. On return from .disconnect(), any pending resets will be |
| 3968 | * cancelled. |
| 3969 | * |
| 3970 | * There is no no need to lock/unlock the @reset_ws as schedule_work() |
| 3971 | * does its own. |
| 3972 | * |
| 3973 | * NOTE: We don't do any reference count tracking because it is not |
| 3974 | * needed. The lifecycle of the work_struct is tied to the |
| 3975 | * usb_interface. Before destroying the interface we cancel the |
| 3976 | * work_struct, so the fact that work_struct is queued and or |
| 3977 | * running means the interface (and thus, the device) exist and |
| 3978 | * are referenced. |
| 3979 | */ |
| 3980 | void usb_queue_reset_device(struct usb_interface *iface) |
| 3981 | { |
| 3982 | schedule_work(&iface->reset_ws); |
| 3983 | } |
| 3984 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |