1/* 2 * Intel Wireless WiMAX Connection 2400m 3 * Linux driver model glue for USB device, reset & fw upload 4 * 5 * 6 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com> 7 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> 8 * Yanir Lubetkin <yanirx.lubetkin@intel.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License version 12 * 2 as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 22 * 02110-1301, USA. 23 * 24 * 25 * See i2400m-usb.h for a general description of this driver. 26 * 27 * This file implements driver model glue, and hook ups for the 28 * generic driver to implement the bus-specific functions (device 29 * communication setup/tear down, firmware upload and resetting). 30 * 31 * ROADMAP 32 * 33 * i2400mu_probe() 34 * alloc_netdev()... 35 * i2400mu_netdev_setup() 36 * i2400mu_init() 37 * i2400m_netdev_setup() 38 * i2400m_setup()... 39 * 40 * i2400mu_disconnect 41 * i2400m_release() 42 * free_netdev() 43 * 44 * i2400mu_suspend() 45 * i2400m_cmd_enter_powersave() 46 * i2400mu_notification_release() 47 * 48 * i2400mu_resume() 49 * i2400mu_notification_setup() 50 * 51 * i2400mu_bus_dev_start() Called by i2400m_dev_start() [who is 52 * i2400mu_tx_setup() called by i2400m_setup()] 53 * i2400mu_rx_setup() 54 * i2400mu_notification_setup() 55 * 56 * i2400mu_bus_dev_stop() Called by i2400m_dev_stop() [who is 57 * i2400mu_notification_release() called by i2400m_release()] 58 * i2400mu_rx_release() 59 * i2400mu_tx_release() 60 * 61 * i2400mu_bus_reset() Called by i2400m_reset 62 * __i2400mu_reset() 63 * __i2400mu_send_barker() 64 * usb_reset_device() 65 */ 66#include "i2400m-usb.h" 67#include <linux/wimax/i2400m.h> 68#include <linux/debugfs.h> 69#include <linux/slab.h> 70 71 72#define D_SUBMODULE usb 73#include "usb-debug-levels.h" 74 75static char i2400mu_debug_params[128]; 76module_param_string(debug, i2400mu_debug_params, sizeof(i2400mu_debug_params), 77 0644); 78MODULE_PARM_DESC(debug, 79 "String of space-separated NAME:VALUE pairs, where NAMEs " 80 "are the different debug submodules and VALUE are the " 81 "initial debug value to set."); 82 83/* Our firmware file name */ 84static const char *i2400mu_bus_fw_names_5x50[] = { 85#define I2400MU_FW_FILE_NAME_v1_5 "i2400m-fw-usb-1.5.sbcf" 86 I2400MU_FW_FILE_NAME_v1_5, 87#define I2400MU_FW_FILE_NAME_v1_4 "i2400m-fw-usb-1.4.sbcf" 88 I2400MU_FW_FILE_NAME_v1_4, 89 NULL, 90}; 91 92 93static const char *i2400mu_bus_fw_names_6050[] = { 94#define I6050U_FW_FILE_NAME_v1_5 "i6050-fw-usb-1.5.sbcf" 95 I6050U_FW_FILE_NAME_v1_5, 96 NULL, 97}; 98 99 100static 101int i2400mu_bus_dev_start(struct i2400m *i2400m) 102{ 103 int result; 104 struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m); 105 struct device *dev = &i2400mu->usb_iface->dev; 106 107 d_fnstart(3, dev, "(i2400m %p)\n", i2400m); 108 result = i2400mu_tx_setup(i2400mu); 109 if (result < 0) 110 goto error_usb_tx_setup; 111 result = i2400mu_rx_setup(i2400mu); 112 if (result < 0) 113 goto error_usb_rx_setup; 114 result = i2400mu_notification_setup(i2400mu); 115 if (result < 0) 116 goto error_notif_setup; 117 d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); 118 return result; 119 120error_notif_setup: 121 i2400mu_rx_release(i2400mu); 122error_usb_rx_setup: 123 i2400mu_tx_release(i2400mu); 124error_usb_tx_setup: 125 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); 126 return result; 127} 128 129 130static 131void i2400mu_bus_dev_stop(struct i2400m *i2400m) 132{ 133 struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m); 134 struct device *dev = &i2400mu->usb_iface->dev; 135 136 d_fnstart(3, dev, "(i2400m %p)\n", i2400m); 137 i2400mu_notification_release(i2400mu); 138 i2400mu_rx_release(i2400mu); 139 i2400mu_tx_release(i2400mu); 140 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); 141} 142 143 144/* 145 * Sends a barker buffer to the device 146 * 147 * This helper will allocate a kmalloced buffer and use it to transmit 148 * (then free it). Reason for this is that other arches cannot use 149 * stack/vmalloc/text areas for DMA transfers. 150 * 151 * Error recovery here is simpler: anything is considered a hard error 152 * and will move the reset code to use a last-resort bus-based reset. 153 */ 154static 155int __i2400mu_send_barker(struct i2400mu *i2400mu, 156 const __le32 *barker, 157 size_t barker_size, 158 unsigned endpoint) 159{ 160 struct usb_endpoint_descriptor *epd = NULL; 161 int pipe, actual_len, ret; 162 struct device *dev = &i2400mu->usb_iface->dev; 163 void *buffer; 164 int do_autopm = 1; 165 166 ret = usb_autopm_get_interface(i2400mu->usb_iface); 167 if (ret < 0) { 168 dev_err(dev, "RESET: can't get autopm: %d\n", ret); 169 do_autopm = 0; 170 } 171 ret = -ENOMEM; 172 buffer = kmalloc(barker_size, GFP_KERNEL); 173 if (buffer == NULL) 174 goto error_kzalloc; 175 epd = usb_get_epd(i2400mu->usb_iface, endpoint); 176 pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress); 177 memcpy(buffer, barker, barker_size); 178retry: 179 ret = usb_bulk_msg(i2400mu->usb_dev, pipe, buffer, barker_size, 180 &actual_len, 200); 181 switch (ret) { 182 case 0: 183 if (actual_len != barker_size) { /* Too short? drop it */ 184 dev_err(dev, "E: %s: short write (%d B vs %zu " 185 "expected)\n", 186 __func__, actual_len, barker_size); 187 ret = -EIO; 188 } 189 break; 190 case -EPIPE: 191 /* 192 * Stall -- maybe the device is choking with our 193 * requests. Clear it and give it some time. If they 194 * happen to often, it might be another symptom, so we 195 * reset. 196 * 197 * No error handling for usb_clear_halt(0; if it 198 * works, the retry works; if it fails, this switch 199 * does the error handling for us. 200 */ 201 if (edc_inc(&i2400mu->urb_edc, 202 10 * EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { 203 dev_err(dev, "E: %s: too many stalls in " 204 "URB; resetting device\n", __func__); 205 usb_queue_reset_device(i2400mu->usb_iface); 206 /* fallthrough */ 207 } else { 208 usb_clear_halt(i2400mu->usb_dev, pipe); 209 msleep(10); /* give the device some time */ 210 goto retry; 211 } 212 case -EINVAL: /* while removing driver */ 213 case -ENODEV: /* dev disconnect ... */ 214 case -ENOENT: /* just ignore it */ 215 case -ESHUTDOWN: /* and exit */ 216 case -ECONNRESET: 217 ret = -ESHUTDOWN; 218 break; 219 default: /* Some error? */ 220 if (edc_inc(&i2400mu->urb_edc, 221 EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { 222 dev_err(dev, "E: %s: maximum errors in URB " 223 "exceeded; resetting device\n", 224 __func__); 225 usb_queue_reset_device(i2400mu->usb_iface); 226 } else { 227 dev_warn(dev, "W: %s: cannot send URB: %d\n", 228 __func__, ret); 229 goto retry; 230 } 231 } 232 kfree(buffer); 233error_kzalloc: 234 if (do_autopm) 235 usb_autopm_put_interface(i2400mu->usb_iface); 236 return ret; 237} 238 239 240/* 241 * Reset a device at different levels (warm, cold or bus) 242 * 243 * @i2400m: device descriptor 244 * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS) 245 * 246 * Warm and cold resets get a USB reset if they fail. 247 * 248 * Warm reset: 249 * 250 * The device will be fully reset internally, but won't be 251 * disconnected from the USB bus (so no reenumeration will 252 * happen). Firmware upload will be necessary. 253 * 254 * The device will send a reboot barker in the notification endpoint 255 * that will trigger the driver to reinitialize the state 256 * automatically from notif.c:i2400m_notification_grok() into 257 * i2400m_dev_bootstrap_delayed(). 258 * 259 * Cold and bus (USB) reset: 260 * 261 * The device will be fully reset internally, disconnected from the 262 * USB bus an a reenumeration will happen. Firmware upload will be 263 * necessary. Thus, we don't do any locking or struct 264 * reinitialization, as we are going to be fully disconnected and 265 * reenumerated. 266 * 267 * Note we need to return -ENODEV if a warm reset was requested and we 268 * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset() 269 * and wimax_dev->op_reset. 270 * 271 * WARNING: no driver state saved/fixed 272 */ 273static 274int i2400mu_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt) 275{ 276 int result; 277 struct i2400mu *i2400mu = 278 container_of(i2400m, struct i2400mu, i2400m); 279 struct device *dev = i2400m_dev(i2400m); 280 static const __le32 i2400m_WARM_BOOT_BARKER[4] = { 281 cpu_to_le32(I2400M_WARM_RESET_BARKER), 282 cpu_to_le32(I2400M_WARM_RESET_BARKER), 283 cpu_to_le32(I2400M_WARM_RESET_BARKER), 284 cpu_to_le32(I2400M_WARM_RESET_BARKER), 285 }; 286 static const __le32 i2400m_COLD_BOOT_BARKER[4] = { 287 cpu_to_le32(I2400M_COLD_RESET_BARKER), 288 cpu_to_le32(I2400M_COLD_RESET_BARKER), 289 cpu_to_le32(I2400M_COLD_RESET_BARKER), 290 cpu_to_le32(I2400M_COLD_RESET_BARKER), 291 }; 292 293 d_fnstart(3, dev, "(i2400m %p rt %u)\n", i2400m, rt); 294 if (rt == I2400M_RT_WARM) 295 result = __i2400mu_send_barker( 296 i2400mu, i2400m_WARM_BOOT_BARKER, 297 sizeof(i2400m_WARM_BOOT_BARKER), 298 i2400mu->endpoint_cfg.bulk_out); 299 else if (rt == I2400M_RT_COLD) 300 result = __i2400mu_send_barker( 301 i2400mu, i2400m_COLD_BOOT_BARKER, 302 sizeof(i2400m_COLD_BOOT_BARKER), 303 i2400mu->endpoint_cfg.reset_cold); 304 else if (rt == I2400M_RT_BUS) { 305 result = usb_reset_device(i2400mu->usb_dev); 306 switch (result) { 307 case 0: 308 case -EINVAL: /* device is gone */ 309 case -ENODEV: 310 case -ENOENT: 311 case -ESHUTDOWN: 312 result = 0; 313 break; /* We assume the device is disconnected */ 314 default: 315 dev_err(dev, "USB reset failed (%d), giving up!\n", 316 result); 317 } 318 } else { 319 result = -EINVAL; /* shut gcc up in certain arches */ 320 BUG(); 321 } 322 if (result < 0 323 && result != -EINVAL /* device is gone */ 324 && rt != I2400M_RT_BUS) { 325 /* 326 * Things failed -- resort to lower level reset, that 327 * we queue in another context; the reason for this is 328 * that the pre and post reset functionality requires 329 * the i2400m->init_mutex; RT_WARM and RT_COLD can 330 * come from areas where i2400m->init_mutex is taken. 331 */ 332 dev_err(dev, "%s reset failed (%d); trying USB reset\n", 333 rt == I2400M_RT_WARM ? "warm" : "cold", result); 334 usb_queue_reset_device(i2400mu->usb_iface); 335 result = -ENODEV; 336 } 337 d_fnend(3, dev, "(i2400m %p rt %u) = %d\n", i2400m, rt, result); 338 return result; 339} 340 341 342static 343void i2400mu_netdev_setup(struct net_device *net_dev) 344{ 345 struct i2400m *i2400m = net_dev_to_i2400m(net_dev); 346 struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m); 347 i2400mu_init(i2400mu); 348 i2400m_netdev_setup(net_dev); 349} 350 351 352/* 353 * Debug levels control; see debug.h 354 */ 355struct d_level D_LEVEL[] = { 356 D_SUBMODULE_DEFINE(usb), 357 D_SUBMODULE_DEFINE(fw), 358 D_SUBMODULE_DEFINE(notif), 359 D_SUBMODULE_DEFINE(rx), 360 D_SUBMODULE_DEFINE(tx), 361}; 362size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL); 363 364 365#define __debugfs_register(prefix, name, parent) \ 366do { \ 367 result = d_level_register_debugfs(prefix, name, parent); \ 368 if (result < 0) \ 369 goto error; \ 370} while (0) 371 372 373static 374int i2400mu_debugfs_add(struct i2400mu *i2400mu) 375{ 376 int result; 377 struct device *dev = &i2400mu->usb_iface->dev; 378 struct dentry *dentry = i2400mu->i2400m.wimax_dev.debugfs_dentry; 379 struct dentry *fd; 380 381 dentry = debugfs_create_dir("i2400m-usb", dentry); 382 result = PTR_ERR(dentry); 383 if (IS_ERR(dentry)) { 384 if (result == -ENODEV) 385 result = 0; /* No debugfs support */ 386 goto error; 387 } 388 i2400mu->debugfs_dentry = dentry; 389 __debugfs_register("dl_", usb, dentry); 390 __debugfs_register("dl_", fw, dentry); 391 __debugfs_register("dl_", notif, dentry); 392 __debugfs_register("dl_", rx, dentry); 393 __debugfs_register("dl_", tx, dentry); 394 395 /* Don't touch these if you don't know what you are doing */ 396 fd = debugfs_create_u8("rx_size_auto_shrink", 0600, dentry, 397 &i2400mu->rx_size_auto_shrink); 398 result = PTR_ERR(fd); 399 if (IS_ERR(fd) && result != -ENODEV) { 400 dev_err(dev, "Can't create debugfs entry " 401 "rx_size_auto_shrink: %d\n", result); 402 goto error; 403 } 404 405 fd = debugfs_create_size_t("rx_size", 0600, dentry, 406 &i2400mu->rx_size); 407 result = PTR_ERR(fd); 408 if (IS_ERR(fd) && result != -ENODEV) { 409 dev_err(dev, "Can't create debugfs entry " 410 "rx_size: %d\n", result); 411 goto error; 412 } 413 414 return 0; 415 416error: 417 debugfs_remove_recursive(i2400mu->debugfs_dentry); 418 return result; 419} 420 421 422static struct device_type i2400mu_type = { 423 .name = "wimax", 424}; 425 426/* 427 * Probe a i2400m interface and register it 428 * 429 * @iface: USB interface to link to 430 * @id: USB class/subclass/protocol id 431 * @returns: 0 if ok, < 0 errno code on error. 432 * 433 * Alloc a net device, initialize the bus-specific details and then 434 * calls the bus-generic initialization routine. That will register 435 * the wimax and netdev devices, upload the firmware [using 436 * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the 437 * communication with the device and then will start to talk to it to 438 * finnish setting it up. 439 */ 440static 441int i2400mu_probe(struct usb_interface *iface, 442 const struct usb_device_id *id) 443{ 444 int result; 445 struct net_device *net_dev; 446 struct device *dev = &iface->dev; 447 struct i2400m *i2400m; 448 struct i2400mu *i2400mu; 449 struct usb_device *usb_dev = interface_to_usbdev(iface); 450 451 if (usb_dev->speed != USB_SPEED_HIGH) 452 dev_err(dev, "device not connected as high speed\n"); 453 454 /* Allocate instance [calls i2400m_netdev_setup() on it]. */ 455 result = -ENOMEM; 456 net_dev = alloc_netdev(sizeof(*i2400mu), "wmx%d", 457 i2400mu_netdev_setup); 458 if (net_dev == NULL) { 459 dev_err(dev, "no memory for network device instance\n"); 460 goto error_alloc_netdev; 461 } 462 SET_NETDEV_DEV(net_dev, dev); 463 SET_NETDEV_DEVTYPE(net_dev, &i2400mu_type); 464 i2400m = net_dev_to_i2400m(net_dev); 465 i2400mu = container_of(i2400m, struct i2400mu, i2400m); 466 i2400m->wimax_dev.net_dev = net_dev; 467 i2400mu->usb_dev = usb_get_dev(usb_dev); 468 i2400mu->usb_iface = iface; 469 usb_set_intfdata(iface, i2400mu); 470 471 i2400m->bus_tx_block_size = I2400MU_BLK_SIZE; 472 /* 473 * Room required in the Tx queue for USB message to accommodate 474 * a smallest payload while allocating header space is 16 bytes. 475 * Adding this room for the new tx message increases the 476 * possibilities of including any payload with size <= 16 bytes. 477 */ 478 i2400m->bus_tx_room_min = I2400MU_BLK_SIZE; 479 i2400m->bus_pl_size_max = I2400MU_PL_SIZE_MAX; 480 i2400m->bus_setup = NULL; 481 i2400m->bus_dev_start = i2400mu_bus_dev_start; 482 i2400m->bus_dev_stop = i2400mu_bus_dev_stop; 483 i2400m->bus_release = NULL; 484 i2400m->bus_tx_kick = i2400mu_bus_tx_kick; 485 i2400m->bus_reset = i2400mu_bus_reset; 486 i2400m->bus_bm_retries = I2400M_USB_BOOT_RETRIES; 487 i2400m->bus_bm_cmd_send = i2400mu_bus_bm_cmd_send; 488 i2400m->bus_bm_wait_for_ack = i2400mu_bus_bm_wait_for_ack; 489 i2400m->bus_bm_mac_addr_impaired = 0; 490 491 switch (id->idProduct) { 492 case USB_DEVICE_ID_I6050: 493 case USB_DEVICE_ID_I6050_2: 494 case USB_DEVICE_ID_I6250: 495 i2400mu->i6050 = 1; 496 break; 497 default: 498 break; 499 } 500 501 if (i2400mu->i6050) { 502 i2400m->bus_fw_names = i2400mu_bus_fw_names_6050; 503 i2400mu->endpoint_cfg.bulk_out = 0; 504 i2400mu->endpoint_cfg.notification = 3; 505 i2400mu->endpoint_cfg.reset_cold = 2; 506 i2400mu->endpoint_cfg.bulk_in = 1; 507 } else { 508 i2400m->bus_fw_names = i2400mu_bus_fw_names_5x50; 509 i2400mu->endpoint_cfg.bulk_out = 0; 510 i2400mu->endpoint_cfg.notification = 1; 511 i2400mu->endpoint_cfg.reset_cold = 2; 512 i2400mu->endpoint_cfg.bulk_in = 3; 513 } 514#ifdef CONFIG_PM 515 iface->needs_remote_wakeup = 1; /* autosuspend (15s delay) */ 516 device_init_wakeup(dev, 1); 517 usb_dev->autosuspend_delay = 15 * HZ; 518 usb_enable_autosuspend(usb_dev); 519#endif 520 521 result = i2400m_setup(i2400m, I2400M_BRI_MAC_REINIT); 522 if (result < 0) { 523 dev_err(dev, "cannot setup device: %d\n", result); 524 goto error_setup; 525 } 526 result = i2400mu_debugfs_add(i2400mu); 527 if (result < 0) { 528 dev_err(dev, "Can't register i2400mu's debugfs: %d\n", result); 529 goto error_debugfs_add; 530 } 531 return 0; 532 533error_debugfs_add: 534 i2400m_release(i2400m); 535error_setup: 536 usb_set_intfdata(iface, NULL); 537 usb_put_dev(i2400mu->usb_dev); 538 free_netdev(net_dev); 539error_alloc_netdev: 540 return result; 541} 542 543 544/* 545 * Disconect a i2400m from the system. 546 * 547 * i2400m_stop() has been called before, so al the rx and tx contexts 548 * have been taken down already. Make sure the queue is stopped, 549 * unregister netdev and i2400m, free and kill. 550 */ 551static 552void i2400mu_disconnect(struct usb_interface *iface) 553{ 554 struct i2400mu *i2400mu = usb_get_intfdata(iface); 555 struct i2400m *i2400m = &i2400mu->i2400m; 556 struct net_device *net_dev = i2400m->wimax_dev.net_dev; 557 struct device *dev = &iface->dev; 558 559 d_fnstart(3, dev, "(iface %p i2400m %p)\n", iface, i2400m); 560 561 debugfs_remove_recursive(i2400mu->debugfs_dentry); 562 i2400m_release(i2400m); 563 usb_set_intfdata(iface, NULL); 564 usb_put_dev(i2400mu->usb_dev); 565 free_netdev(net_dev); 566 d_fnend(3, dev, "(iface %p i2400m %p) = void\n", iface, i2400m); 567} 568 569 570/* 571 * Get the device ready for USB port or system standby and hibernation 572 * 573 * USB port and system standby are handled the same. 574 * 575 * When the system hibernates, the USB device is powered down and then 576 * up, so we don't really have to do much here, as it will be seen as 577 * a reconnect. Still for simplicity we consider this case the same as 578 * suspend, so that the device has a chance to do notify the base 579 * station (if connected). 580 * 581 * So at the end, the three cases require common handling. 582 * 583 * If at the time of this call the device's firmware is not loaded, 584 * nothing has to be done. Note we can be "loose" about not reading 585 * i2400m->updown under i2400m->init_mutex. If it happens to change 586 * inmediately, other parts of the call flow will fail and effectively 587 * catch it. 588 * 589 * If the firmware is loaded, we need to: 590 * 591 * - tell the device to go into host interface power save mode, wait 592 * for it to ack 593 * 594 * This is quite more interesting than it is; we need to execute a 595 * command, but this time, we don't want the code in usb-{tx,rx}.c 596 * to call the usb_autopm_get/put_interface() barriers as it'd 597 * deadlock, so we need to decrement i2400mu->do_autopm, that acts 598 * as a poor man's semaphore. Ugly, but it works. 599 * 600 * As well, the device might refuse going to sleep for whichever 601 * reason. In this case we just fail. For system suspend/hibernate, 602 * we *can't* fail. We check PM_EVENT_AUTO to see if the 603 * suspend call comes from the USB stack or from the system and act 604 * in consequence. 605 * 606 * - stop the notification endpoint polling 607 */ 608static 609int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg) 610{ 611 int result = 0; 612 struct device *dev = &iface->dev; 613 struct i2400mu *i2400mu = usb_get_intfdata(iface); 614 unsigned is_autosuspend = 0; 615 struct i2400m *i2400m = &i2400mu->i2400m; 616 617#ifdef CONFIG_PM 618 if (pm_msg.event & PM_EVENT_AUTO) 619 is_autosuspend = 1; 620#endif 621 622 d_fnstart(3, dev, "(iface %p pm_msg %u)\n", iface, pm_msg.event); 623 rmb(); /* see i2400m->updown's documentation */ 624 if (i2400m->updown == 0) 625 goto no_firmware; 626 if (i2400m->state == I2400M_SS_DATA_PATH_CONNECTED && is_autosuspend) { 627 /* ugh -- the device is connected and this suspend 628 * request is an autosuspend one (not a system standby 629 * / hibernate). 630 * 631 * The only way the device can go to standby is if the 632 * link with the base station is in IDLE mode; that 633 * were the case, we'd be in status 634 * I2400M_SS_CONNECTED_IDLE. But we are not. 635 * 636 * If we *tell* him to go power save now, it'll reset 637 * as a precautionary measure, so if this is an 638 * autosuspend thing, say no and it'll come back 639 * later, when the link is IDLE 640 */ 641 result = -EBADF; 642 d_printf(1, dev, "fw up, link up, not-idle, autosuspend: " 643 "not entering powersave\n"); 644 goto error_not_now; 645 } 646 d_printf(1, dev, "fw up: entering powersave\n"); 647 atomic_dec(&i2400mu->do_autopm); 648 result = i2400m_cmd_enter_powersave(i2400m); 649 atomic_inc(&i2400mu->do_autopm); 650 if (result < 0 && !is_autosuspend) { 651 /* System suspend, can't fail */ 652 dev_err(dev, "failed to suspend, will reset on resume\n"); 653 result = 0; 654 } 655 if (result < 0) 656 goto error_enter_powersave; 657 i2400mu_notification_release(i2400mu); 658 d_printf(1, dev, "powersave requested\n"); 659error_enter_powersave: 660error_not_now: 661no_firmware: 662 d_fnend(3, dev, "(iface %p pm_msg %u) = %d\n", 663 iface, pm_msg.event, result); 664 return result; 665} 666 667 668static 669int i2400mu_resume(struct usb_interface *iface) 670{ 671 int ret = 0; 672 struct device *dev = &iface->dev; 673 struct i2400mu *i2400mu = usb_get_intfdata(iface); 674 struct i2400m *i2400m = &i2400mu->i2400m; 675 676 d_fnstart(3, dev, "(iface %p)\n", iface); 677 rmb(); /* see i2400m->updown's documentation */ 678 if (i2400m->updown == 0) { 679 d_printf(1, dev, "fw was down, no resume neeed\n"); 680 goto out; 681 } 682 d_printf(1, dev, "fw was up, resuming\n"); 683 i2400mu_notification_setup(i2400mu); 684 /* USB has flow control, so we don't need to give it time to 685 * come back; otherwise, we'd use something like a get-state 686 * command... */ 687out: 688 d_fnend(3, dev, "(iface %p) = %d\n", iface, ret); 689 return ret; 690} 691 692 693static 694int i2400mu_reset_resume(struct usb_interface *iface) 695{ 696 int result; 697 struct device *dev = &iface->dev; 698 struct i2400mu *i2400mu = usb_get_intfdata(iface); 699 struct i2400m *i2400m = &i2400mu->i2400m; 700 701 d_fnstart(3, dev, "(iface %p)\n", iface); 702 result = i2400m_dev_reset_handle(i2400m, "device reset on resume"); 703 d_fnend(3, dev, "(iface %p) = %d\n", iface, result); 704 return result < 0 ? result : 0; 705} 706 707 708/* 709 * Another driver or user space is triggering a reset on the device 710 * which contains the interface passed as an argument. Cease IO and 711 * save any device state you need to restore. 712 * 713 * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if 714 * you are in atomic context. 715 */ 716static 717int i2400mu_pre_reset(struct usb_interface *iface) 718{ 719 struct i2400mu *i2400mu = usb_get_intfdata(iface); 720 return i2400m_pre_reset(&i2400mu->i2400m); 721} 722 723 724/* 725 * The reset has completed. Restore any saved device state and begin 726 * using the device again. 727 * 728 * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if 729 * you are in atomic context. 730 */ 731static 732int i2400mu_post_reset(struct usb_interface *iface) 733{ 734 struct i2400mu *i2400mu = usb_get_intfdata(iface); 735 return i2400m_post_reset(&i2400mu->i2400m); 736} 737 738 739static 740struct usb_device_id i2400mu_id_table[] = { 741 { USB_DEVICE(0x8086, USB_DEVICE_ID_I6050) }, 742 { USB_DEVICE(0x8086, USB_DEVICE_ID_I6050_2) }, 743 { USB_DEVICE(0x8086, USB_DEVICE_ID_I6250) }, 744 { USB_DEVICE(0x8086, 0x0181) }, 745 { USB_DEVICE(0x8086, 0x1403) }, 746 { USB_DEVICE(0x8086, 0x1405) }, 747 { USB_DEVICE(0x8086, 0x0180) }, 748 { USB_DEVICE(0x8086, 0x0182) }, 749 { USB_DEVICE(0x8086, 0x1406) }, 750 { USB_DEVICE(0x8086, 0x1403) }, 751 { }, 752}; 753MODULE_DEVICE_TABLE(usb, i2400mu_id_table); 754 755 756static 757struct usb_driver i2400mu_driver = { 758 .name = KBUILD_MODNAME, 759 .suspend = i2400mu_suspend, 760 .resume = i2400mu_resume, 761 .reset_resume = i2400mu_reset_resume, 762 .probe = i2400mu_probe, 763 .disconnect = i2400mu_disconnect, 764 .pre_reset = i2400mu_pre_reset, 765 .post_reset = i2400mu_post_reset, 766 .id_table = i2400mu_id_table, 767 .supports_autosuspend = 1, 768}; 769 770static 771int __init i2400mu_driver_init(void) 772{ 773 d_parse_params(D_LEVEL, D_LEVEL_SIZE, i2400mu_debug_params, 774 "i2400m_usb.debug"); 775 return usb_register(&i2400mu_driver); 776} 777module_init(i2400mu_driver_init); 778 779 780static 781void __exit i2400mu_driver_exit(void) 782{ 783 flush_scheduled_work(); /* for the stuff we schedule from sysfs.c */ 784 usb_deregister(&i2400mu_driver); 785} 786module_exit(i2400mu_driver_exit); 787 788MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>"); 789MODULE_DESCRIPTION("Driver for USB based Intel Wireless WiMAX Connection 2400M " 790 "(5x50 & 6050)"); 791MODULE_LICENSE("GPL"); 792MODULE_FIRMWARE(I2400MU_FW_FILE_NAME_v1_5); 793MODULE_FIRMWARE(I6050U_FW_FILE_NAME_v1_5); 794