hso.c revision d5dc0ae4df9db00b8122378d56a071039b17a1eb
1/****************************************************************************** 2 * 3 * Driver for Option High Speed Mobile Devices. 4 * 5 * Copyright (C) 2008 Option International 6 * Filip Aben <f.aben@option.com> 7 * Denis Joseph Barrow <d.barow@option.com> 8 * Jan Dumon <j.dumon@option.com> 9 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd) 10 * <ajb@spheresystems.co.uk> 11 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de> 12 * Copyright (C) 2008 Novell, Inc. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 as 16 * published by the Free Software Foundation. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 26 * USA 27 * 28 * 29 *****************************************************************************/ 30 31/****************************************************************************** 32 * 33 * Description of the device: 34 * 35 * Interface 0: Contains the IP network interface on the bulk end points. 36 * The multiplexed serial ports are using the interrupt and 37 * control endpoints. 38 * Interrupt contains a bitmap telling which multiplexed 39 * serialport needs servicing. 40 * 41 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the 42 * port is opened, as this have a huge impact on the network port 43 * throughput. 44 * 45 * Interface 2: Standard modem interface - circuit switched interface, this 46 * can be used to make a standard ppp connection however it 47 * should not be used in conjunction with the IP network interface 48 * enabled for USB performance reasons i.e. if using this set 49 * ideally disable_net=1. 50 * 51 *****************************************************************************/ 52 53#include <linux/sched.h> 54#include <linux/slab.h> 55#include <linux/init.h> 56#include <linux/delay.h> 57#include <linux/netdevice.h> 58#include <linux/module.h> 59#include <linux/ethtool.h> 60#include <linux/usb.h> 61#include <linux/timer.h> 62#include <linux/tty.h> 63#include <linux/tty_driver.h> 64#include <linux/tty_flip.h> 65#include <linux/kmod.h> 66#include <linux/rfkill.h> 67#include <linux/ip.h> 68#include <linux/uaccess.h> 69#include <linux/usb/cdc.h> 70#include <net/arp.h> 71#include <asm/byteorder.h> 72#include <linux/serial_core.h> 73#include <linux/serial.h> 74 75 76#define DRIVER_VERSION "1.2" 77#define MOD_AUTHOR "Option Wireless" 78#define MOD_DESCRIPTION "USB High Speed Option driver" 79#define MOD_LICENSE "GPL" 80 81#define HSO_MAX_NET_DEVICES 10 82#define HSO__MAX_MTU 2048 83#define DEFAULT_MTU 1500 84#define DEFAULT_MRU 1500 85 86#define CTRL_URB_RX_SIZE 1024 87#define CTRL_URB_TX_SIZE 64 88 89#define BULK_URB_RX_SIZE 4096 90#define BULK_URB_TX_SIZE 8192 91 92#define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU 93#define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU 94#define MUX_BULK_RX_BUF_COUNT 4 95#define USB_TYPE_OPTION_VENDOR 0x20 96 97/* These definitions are used with the struct hso_net flags element */ 98/* - use *_bit operations on it. (bit indices not values.) */ 99#define HSO_NET_RUNNING 0 100 101#define HSO_NET_TX_TIMEOUT (HZ*10) 102 103#define HSO_SERIAL_MAGIC 0x48534f31 104 105/* Number of ttys to handle */ 106#define HSO_SERIAL_TTY_MINORS 256 107 108#define MAX_RX_URBS 2 109 110static inline struct hso_serial *get_serial_by_tty(struct tty_struct *tty) 111{ 112 if (tty) 113 return tty->driver_data; 114 return NULL; 115} 116 117/*****************************************************************************/ 118/* Debugging functions */ 119/*****************************************************************************/ 120#define D__(lvl_, fmt, arg...) \ 121 do { \ 122 printk(lvl_ "[%d:%s]: " fmt "\n", \ 123 __LINE__, __func__, ## arg); \ 124 } while (0) 125 126#define D_(lvl, args...) \ 127 do { \ 128 if (lvl & debug) \ 129 D__(KERN_INFO, args); \ 130 } while (0) 131 132#define D1(args...) D_(0x01, ##args) 133#define D2(args...) D_(0x02, ##args) 134#define D3(args...) D_(0x04, ##args) 135#define D4(args...) D_(0x08, ##args) 136#define D5(args...) D_(0x10, ##args) 137 138/*****************************************************************************/ 139/* Enumerators */ 140/*****************************************************************************/ 141enum pkt_parse_state { 142 WAIT_IP, 143 WAIT_DATA, 144 WAIT_SYNC 145}; 146 147/*****************************************************************************/ 148/* Structs */ 149/*****************************************************************************/ 150 151struct hso_shared_int { 152 struct usb_endpoint_descriptor *intr_endp; 153 void *shared_intr_buf; 154 struct urb *shared_intr_urb; 155 struct usb_device *usb; 156 int use_count; 157 int ref_count; 158 struct mutex shared_int_lock; 159}; 160 161struct hso_net { 162 struct hso_device *parent; 163 struct net_device *net; 164 struct rfkill *rfkill; 165 166 struct usb_endpoint_descriptor *in_endp; 167 struct usb_endpoint_descriptor *out_endp; 168 169 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT]; 170 struct urb *mux_bulk_tx_urb; 171 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT]; 172 void *mux_bulk_tx_buf; 173 174 struct sk_buff *skb_rx_buf; 175 struct sk_buff *skb_tx_buf; 176 177 enum pkt_parse_state rx_parse_state; 178 spinlock_t net_lock; 179 180 unsigned short rx_buf_size; 181 unsigned short rx_buf_missing; 182 struct iphdr rx_ip_hdr; 183 184 unsigned long flags; 185}; 186 187enum rx_ctrl_state{ 188 RX_IDLE, 189 RX_SENT, 190 RX_PENDING 191}; 192 193#define BM_REQUEST_TYPE (0xa1) 194#define B_NOTIFICATION (0x20) 195#define W_VALUE (0x0) 196#define W_INDEX (0x2) 197#define W_LENGTH (0x2) 198 199#define B_OVERRUN (0x1<<6) 200#define B_PARITY (0x1<<5) 201#define B_FRAMING (0x1<<4) 202#define B_RING_SIGNAL (0x1<<3) 203#define B_BREAK (0x1<<2) 204#define B_TX_CARRIER (0x1<<1) 205#define B_RX_CARRIER (0x1<<0) 206 207struct hso_serial_state_notification { 208 u8 bmRequestType; 209 u8 bNotification; 210 u16 wValue; 211 u16 wIndex; 212 u16 wLength; 213 u16 UART_state_bitmap; 214} __attribute__((packed)); 215 216struct hso_tiocmget { 217 struct mutex mutex; 218 wait_queue_head_t waitq; 219 int intr_completed; 220 struct usb_endpoint_descriptor *endp; 221 struct urb *urb; 222 struct hso_serial_state_notification serial_state_notification; 223 u16 prev_UART_state_bitmap; 224 struct uart_icount icount; 225}; 226 227 228struct hso_serial { 229 struct hso_device *parent; 230 int magic; 231 u8 minor; 232 233 struct hso_shared_int *shared_int; 234 235 /* rx/tx urb could be either a bulk urb or a control urb depending 236 on which serial port it is used on. */ 237 struct urb *rx_urb[MAX_RX_URBS]; 238 u8 num_rx_urbs; 239 u8 *rx_data[MAX_RX_URBS]; 240 u16 rx_data_length; /* should contain allocated length */ 241 242 struct urb *tx_urb; 243 u8 *tx_data; 244 u8 *tx_buffer; 245 u16 tx_data_length; /* should contain allocated length */ 246 u16 tx_data_count; 247 u16 tx_buffer_count; 248 struct usb_ctrlrequest ctrl_req_tx; 249 struct usb_ctrlrequest ctrl_req_rx; 250 251 struct usb_endpoint_descriptor *in_endp; 252 struct usb_endpoint_descriptor *out_endp; 253 254 enum rx_ctrl_state rx_state; 255 u8 rts_state; 256 u8 dtr_state; 257 unsigned tx_urb_used:1; 258 259 /* from usb_serial_port */ 260 struct tty_struct *tty; 261 int open_count; 262 spinlock_t serial_lock; 263 264 int (*write_data) (struct hso_serial *serial); 265 struct hso_tiocmget *tiocmget; 266 /* Hacks required to get flow control 267 * working on the serial receive buffers 268 * so as not to drop characters on the floor. 269 */ 270 int curr_rx_urb_idx; 271 u16 curr_rx_urb_offset; 272 u8 rx_urb_filled[MAX_RX_URBS]; 273 struct tasklet_struct unthrottle_tasklet; 274 struct work_struct retry_unthrottle_workqueue; 275}; 276 277struct hso_device { 278 union { 279 struct hso_serial *dev_serial; 280 struct hso_net *dev_net; 281 } port_data; 282 283 u32 port_spec; 284 285 u8 is_active; 286 u8 usb_gone; 287 struct work_struct async_get_intf; 288 struct work_struct async_put_intf; 289 struct work_struct reset_device; 290 291 struct usb_device *usb; 292 struct usb_interface *interface; 293 294 struct device *dev; 295 struct kref ref; 296 struct mutex mutex; 297}; 298 299/* Type of interface */ 300#define HSO_INTF_MASK 0xFF00 301#define HSO_INTF_MUX 0x0100 302#define HSO_INTF_BULK 0x0200 303 304/* Type of port */ 305#define HSO_PORT_MASK 0xFF 306#define HSO_PORT_NO_PORT 0x0 307#define HSO_PORT_CONTROL 0x1 308#define HSO_PORT_APP 0x2 309#define HSO_PORT_GPS 0x3 310#define HSO_PORT_PCSC 0x4 311#define HSO_PORT_APP2 0x5 312#define HSO_PORT_GPS_CONTROL 0x6 313#define HSO_PORT_MSD 0x7 314#define HSO_PORT_VOICE 0x8 315#define HSO_PORT_DIAG2 0x9 316#define HSO_PORT_DIAG 0x10 317#define HSO_PORT_MODEM 0x11 318#define HSO_PORT_NETWORK 0x12 319 320/* Additional device info */ 321#define HSO_INFO_MASK 0xFF000000 322#define HSO_INFO_CRC_BUG 0x01000000 323 324/*****************************************************************************/ 325/* Prototypes */ 326/*****************************************************************************/ 327/* Serial driver functions */ 328static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file, 329 unsigned int set, unsigned int clear); 330static void ctrl_callback(struct urb *urb); 331static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial); 332static void hso_kick_transmit(struct hso_serial *serial); 333/* Helper functions */ 334static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int, 335 struct usb_device *usb, gfp_t gfp); 336static void handle_usb_error(int status, const char *function, 337 struct hso_device *hso_dev); 338static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf, 339 int type, int dir); 340static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports); 341static void hso_free_interface(struct usb_interface *intf); 342static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags); 343static int hso_stop_serial_device(struct hso_device *hso_dev); 344static int hso_start_net_device(struct hso_device *hso_dev); 345static void hso_free_shared_int(struct hso_shared_int *shared_int); 346static int hso_stop_net_device(struct hso_device *hso_dev); 347static void hso_serial_ref_free(struct kref *ref); 348static void hso_std_serial_read_bulk_callback(struct urb *urb); 349static int hso_mux_serial_read(struct hso_serial *serial); 350static void async_get_intf(struct work_struct *data); 351static void async_put_intf(struct work_struct *data); 352static int hso_put_activity(struct hso_device *hso_dev); 353static int hso_get_activity(struct hso_device *hso_dev); 354static void tiocmget_intr_callback(struct urb *urb); 355static void reset_device(struct work_struct *data); 356/*****************************************************************************/ 357/* Helping functions */ 358/*****************************************************************************/ 359 360/* #define DEBUG */ 361 362static inline struct hso_net *dev2net(struct hso_device *hso_dev) 363{ 364 return hso_dev->port_data.dev_net; 365} 366 367static inline struct hso_serial *dev2ser(struct hso_device *hso_dev) 368{ 369 return hso_dev->port_data.dev_serial; 370} 371 372/* Debugging functions */ 373#ifdef DEBUG 374static void dbg_dump(int line_count, const char *func_name, unsigned char *buf, 375 unsigned int len) 376{ 377 static char name[255]; 378 379 sprintf(name, "hso[%d:%s]", line_count, func_name); 380 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len); 381} 382 383#define DUMP(buf_, len_) \ 384 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_) 385 386#define DUMP1(buf_, len_) \ 387 do { \ 388 if (0x01 & debug) \ 389 DUMP(buf_, len_); \ 390 } while (0) 391#else 392#define DUMP(buf_, len_) 393#define DUMP1(buf_, len_) 394#endif 395 396/* module parameters */ 397static int debug; 398static int tty_major; 399static int disable_net; 400 401/* driver info */ 402static const char driver_name[] = "hso"; 403static const char tty_filename[] = "ttyHS"; 404static const char *version = __FILE__ ": " DRIVER_VERSION " " MOD_AUTHOR; 405/* the usb driver itself (registered in hso_init) */ 406static struct usb_driver hso_driver; 407/* serial structures */ 408static struct tty_driver *tty_drv; 409static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS]; 410static struct hso_device *network_table[HSO_MAX_NET_DEVICES]; 411static spinlock_t serial_table_lock; 412 413static const s32 default_port_spec[] = { 414 HSO_INTF_MUX | HSO_PORT_NETWORK, 415 HSO_INTF_BULK | HSO_PORT_DIAG, 416 HSO_INTF_BULK | HSO_PORT_MODEM, 417 0 418}; 419 420static const s32 icon321_port_spec[] = { 421 HSO_INTF_MUX | HSO_PORT_NETWORK, 422 HSO_INTF_BULK | HSO_PORT_DIAG2, 423 HSO_INTF_BULK | HSO_PORT_MODEM, 424 HSO_INTF_BULK | HSO_PORT_DIAG, 425 0 426}; 427 428#define default_port_device(vendor, product) \ 429 USB_DEVICE(vendor, product), \ 430 .driver_info = (kernel_ulong_t)default_port_spec 431 432#define icon321_port_device(vendor, product) \ 433 USB_DEVICE(vendor, product), \ 434 .driver_info = (kernel_ulong_t)icon321_port_spec 435 436/* list of devices we support */ 437static const struct usb_device_id hso_ids[] = { 438 {default_port_device(0x0af0, 0x6711)}, 439 {default_port_device(0x0af0, 0x6731)}, 440 {default_port_device(0x0af0, 0x6751)}, 441 {default_port_device(0x0af0, 0x6771)}, 442 {default_port_device(0x0af0, 0x6791)}, 443 {default_port_device(0x0af0, 0x6811)}, 444 {default_port_device(0x0af0, 0x6911)}, 445 {default_port_device(0x0af0, 0x6951)}, 446 {default_port_device(0x0af0, 0x6971)}, 447 {default_port_device(0x0af0, 0x7011)}, 448 {default_port_device(0x0af0, 0x7031)}, 449 {default_port_device(0x0af0, 0x7051)}, 450 {default_port_device(0x0af0, 0x7071)}, 451 {default_port_device(0x0af0, 0x7111)}, 452 {default_port_device(0x0af0, 0x7211)}, 453 {default_port_device(0x0af0, 0x7251)}, 454 {default_port_device(0x0af0, 0x7271)}, 455 {default_port_device(0x0af0, 0x7311)}, 456 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */ 457 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */ 458 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */ 459 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */ 460 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */ 461 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */ 462 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */ 463 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */ 464 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */ 465 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */ 466 {USB_DEVICE(0x0af0, 0x7701)}, 467 {USB_DEVICE(0x0af0, 0x7706)}, 468 {USB_DEVICE(0x0af0, 0x7801)}, 469 {USB_DEVICE(0x0af0, 0x7901)}, 470 {USB_DEVICE(0x0af0, 0x7A01)}, 471 {USB_DEVICE(0x0af0, 0x7A05)}, 472 {USB_DEVICE(0x0af0, 0x8200)}, 473 {USB_DEVICE(0x0af0, 0x8201)}, 474 {USB_DEVICE(0x0af0, 0x8300)}, 475 {USB_DEVICE(0x0af0, 0x8302)}, 476 {USB_DEVICE(0x0af0, 0x8304)}, 477 {USB_DEVICE(0x0af0, 0x8400)}, 478 {USB_DEVICE(0x0af0, 0x8600)}, 479 {USB_DEVICE(0x0af0, 0x8800)}, 480 {USB_DEVICE(0x0af0, 0x8900)}, 481 {USB_DEVICE(0x0af0, 0xd035)}, 482 {USB_DEVICE(0x0af0, 0xd055)}, 483 {USB_DEVICE(0x0af0, 0xd155)}, 484 {USB_DEVICE(0x0af0, 0xd255)}, 485 {USB_DEVICE(0x0af0, 0xd057)}, 486 {USB_DEVICE(0x0af0, 0xd157)}, 487 {USB_DEVICE(0x0af0, 0xd257)}, 488 {USB_DEVICE(0x0af0, 0xd357)}, 489 {USB_DEVICE(0x0af0, 0xd058)}, 490 {USB_DEVICE(0x0af0, 0xc100)}, 491 {} 492}; 493MODULE_DEVICE_TABLE(usb, hso_ids); 494 495/* Sysfs attribute */ 496static ssize_t hso_sysfs_show_porttype(struct device *dev, 497 struct device_attribute *attr, 498 char *buf) 499{ 500 struct hso_device *hso_dev = dev_get_drvdata(dev); 501 char *port_name; 502 503 if (!hso_dev) 504 return 0; 505 506 switch (hso_dev->port_spec & HSO_PORT_MASK) { 507 case HSO_PORT_CONTROL: 508 port_name = "Control"; 509 break; 510 case HSO_PORT_APP: 511 port_name = "Application"; 512 break; 513 case HSO_PORT_APP2: 514 port_name = "Application2"; 515 break; 516 case HSO_PORT_GPS: 517 port_name = "GPS"; 518 break; 519 case HSO_PORT_GPS_CONTROL: 520 port_name = "GPS Control"; 521 break; 522 case HSO_PORT_PCSC: 523 port_name = "PCSC"; 524 break; 525 case HSO_PORT_DIAG: 526 port_name = "Diagnostic"; 527 break; 528 case HSO_PORT_DIAG2: 529 port_name = "Diagnostic2"; 530 break; 531 case HSO_PORT_MODEM: 532 port_name = "Modem"; 533 break; 534 case HSO_PORT_NETWORK: 535 port_name = "Network"; 536 break; 537 default: 538 port_name = "Unknown"; 539 break; 540 } 541 542 return sprintf(buf, "%s\n", port_name); 543} 544static DEVICE_ATTR(hsotype, S_IRUGO, hso_sysfs_show_porttype, NULL); 545 546static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb) 547{ 548 int idx; 549 550 for (idx = 0; idx < serial->num_rx_urbs; idx++) 551 if (serial->rx_urb[idx] == urb) 552 return idx; 553 dev_err(serial->parent->dev, "hso_urb_to_index failed\n"); 554 return -1; 555} 556 557/* converts mux value to a port spec value */ 558static u32 hso_mux_to_port(int mux) 559{ 560 u32 result; 561 562 switch (mux) { 563 case 0x1: 564 result = HSO_PORT_CONTROL; 565 break; 566 case 0x2: 567 result = HSO_PORT_APP; 568 break; 569 case 0x4: 570 result = HSO_PORT_PCSC; 571 break; 572 case 0x8: 573 result = HSO_PORT_GPS; 574 break; 575 case 0x10: 576 result = HSO_PORT_APP2; 577 break; 578 default: 579 result = HSO_PORT_NO_PORT; 580 } 581 return result; 582} 583 584/* converts port spec value to a mux value */ 585static u32 hso_port_to_mux(int port) 586{ 587 u32 result; 588 589 switch (port & HSO_PORT_MASK) { 590 case HSO_PORT_CONTROL: 591 result = 0x0; 592 break; 593 case HSO_PORT_APP: 594 result = 0x1; 595 break; 596 case HSO_PORT_PCSC: 597 result = 0x2; 598 break; 599 case HSO_PORT_GPS: 600 result = 0x3; 601 break; 602 case HSO_PORT_APP2: 603 result = 0x4; 604 break; 605 default: 606 result = 0x0; 607 } 608 return result; 609} 610 611static struct hso_serial *get_serial_by_shared_int_and_type( 612 struct hso_shared_int *shared_int, 613 int mux) 614{ 615 int i, port; 616 617 port = hso_mux_to_port(mux); 618 619 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) { 620 if (serial_table[i] && 621 (dev2ser(serial_table[i])->shared_int == shared_int) && 622 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) { 623 return dev2ser(serial_table[i]); 624 } 625 } 626 627 return NULL; 628} 629 630static struct hso_serial *get_serial_by_index(unsigned index) 631{ 632 struct hso_serial *serial = NULL; 633 unsigned long flags; 634 635 spin_lock_irqsave(&serial_table_lock, flags); 636 if (serial_table[index]) 637 serial = dev2ser(serial_table[index]); 638 spin_unlock_irqrestore(&serial_table_lock, flags); 639 640 return serial; 641} 642 643static int get_free_serial_index(void) 644{ 645 int index; 646 unsigned long flags; 647 648 spin_lock_irqsave(&serial_table_lock, flags); 649 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) { 650 if (serial_table[index] == NULL) { 651 spin_unlock_irqrestore(&serial_table_lock, flags); 652 return index; 653 } 654 } 655 spin_unlock_irqrestore(&serial_table_lock, flags); 656 657 printk(KERN_ERR "%s: no free serial devices in table\n", __func__); 658 return -1; 659} 660 661static void set_serial_by_index(unsigned index, struct hso_serial *serial) 662{ 663 unsigned long flags; 664 665 spin_lock_irqsave(&serial_table_lock, flags); 666 if (serial) 667 serial_table[index] = serial->parent; 668 else 669 serial_table[index] = NULL; 670 spin_unlock_irqrestore(&serial_table_lock, flags); 671} 672 673static void handle_usb_error(int status, const char *function, 674 struct hso_device *hso_dev) 675{ 676 char *explanation; 677 678 switch (status) { 679 case -ENODEV: 680 explanation = "no device"; 681 break; 682 case -ENOENT: 683 explanation = "endpoint not enabled"; 684 break; 685 case -EPIPE: 686 explanation = "endpoint stalled"; 687 break; 688 case -ENOSPC: 689 explanation = "not enough bandwidth"; 690 break; 691 case -ESHUTDOWN: 692 explanation = "device disabled"; 693 break; 694 case -EHOSTUNREACH: 695 explanation = "device suspended"; 696 break; 697 case -EINVAL: 698 case -EAGAIN: 699 case -EFBIG: 700 case -EMSGSIZE: 701 explanation = "internal error"; 702 break; 703 case -EILSEQ: 704 case -EPROTO: 705 case -ETIME: 706 case -ETIMEDOUT: 707 explanation = "protocol error"; 708 if (hso_dev) 709 schedule_work(&hso_dev->reset_device); 710 break; 711 default: 712 explanation = "unknown status"; 713 break; 714 } 715 716 /* log a meaningful explanation of an USB status */ 717 D1("%s: received USB status - %s (%d)", function, explanation, status); 718} 719 720/* Network interface functions */ 721 722/* called when net interface is brought up by ifconfig */ 723static int hso_net_open(struct net_device *net) 724{ 725 struct hso_net *odev = netdev_priv(net); 726 unsigned long flags = 0; 727 728 if (!odev) { 729 dev_err(&net->dev, "No net device !\n"); 730 return -ENODEV; 731 } 732 733 odev->skb_tx_buf = NULL; 734 735 /* setup environment */ 736 spin_lock_irqsave(&odev->net_lock, flags); 737 odev->rx_parse_state = WAIT_IP; 738 odev->rx_buf_size = 0; 739 odev->rx_buf_missing = sizeof(struct iphdr); 740 spin_unlock_irqrestore(&odev->net_lock, flags); 741 742 /* We are up and running. */ 743 set_bit(HSO_NET_RUNNING, &odev->flags); 744 hso_start_net_device(odev->parent); 745 746 /* Tell the kernel we are ready to start receiving from it */ 747 netif_start_queue(net); 748 749 return 0; 750} 751 752/* called when interface is brought down by ifconfig */ 753static int hso_net_close(struct net_device *net) 754{ 755 struct hso_net *odev = netdev_priv(net); 756 757 /* we don't need the queue anymore */ 758 netif_stop_queue(net); 759 /* no longer running */ 760 clear_bit(HSO_NET_RUNNING, &odev->flags); 761 762 hso_stop_net_device(odev->parent); 763 764 /* done */ 765 return 0; 766} 767 768/* USB tells is xmit done, we should start the netqueue again */ 769static void write_bulk_callback(struct urb *urb) 770{ 771 struct hso_net *odev = urb->context; 772 int status = urb->status; 773 774 /* Sanity check */ 775 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) { 776 dev_err(&urb->dev->dev, "%s: device not running\n", __func__); 777 return; 778 } 779 780 /* Do we still have a valid kernel network device? */ 781 if (!netif_device_present(odev->net)) { 782 dev_err(&urb->dev->dev, "%s: net device not present\n", 783 __func__); 784 return; 785 } 786 787 /* log status, but don't act on it, we don't need to resubmit anything 788 * anyhow */ 789 if (status) 790 handle_usb_error(status, __func__, odev->parent); 791 792 hso_put_activity(odev->parent); 793 794 /* Tell the network interface we are ready for another frame */ 795 netif_wake_queue(odev->net); 796} 797 798/* called by kernel when we need to transmit a packet */ 799static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb, 800 struct net_device *net) 801{ 802 struct hso_net *odev = netdev_priv(net); 803 int result; 804 805 /* Tell the kernel, "No more frames 'til we are done with this one." */ 806 netif_stop_queue(net); 807 if (hso_get_activity(odev->parent) == -EAGAIN) { 808 odev->skb_tx_buf = skb; 809 return NETDEV_TX_OK; 810 } 811 812 /* log if asked */ 813 DUMP1(skb->data, skb->len); 814 /* Copy it from kernel memory to OUR memory */ 815 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len); 816 D1("len: %d/%d", skb->len, MUX_BULK_TX_BUF_SIZE); 817 818 /* Fill in the URB for shipping it out. */ 819 usb_fill_bulk_urb(odev->mux_bulk_tx_urb, 820 odev->parent->usb, 821 usb_sndbulkpipe(odev->parent->usb, 822 odev->out_endp-> 823 bEndpointAddress & 0x7F), 824 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback, 825 odev); 826 827 /* Deal with the Zero Length packet problem, I hope */ 828 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET; 829 830 /* Send the URB on its merry way. */ 831 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC); 832 if (result) { 833 dev_warn(&odev->parent->interface->dev, 834 "failed mux_bulk_tx_urb %d\n", result); 835 net->stats.tx_errors++; 836 netif_start_queue(net); 837 } else { 838 net->stats.tx_packets++; 839 net->stats.tx_bytes += skb->len; 840 } 841 dev_kfree_skb(skb); 842 /* we're done */ 843 return NETDEV_TX_OK; 844} 845 846static void hso_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) 847{ 848 struct hso_net *odev = netdev_priv(net); 849 850 strncpy(info->driver, driver_name, ETHTOOL_BUSINFO_LEN); 851 strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN); 852 usb_make_path(odev->parent->usb, info->bus_info, sizeof info->bus_info); 853} 854 855static const struct ethtool_ops ops = { 856 .get_drvinfo = hso_get_drvinfo, 857 .get_link = ethtool_op_get_link 858}; 859 860/* called when a packet did not ack after watchdogtimeout */ 861static void hso_net_tx_timeout(struct net_device *net) 862{ 863 struct hso_net *odev = netdev_priv(net); 864 865 if (!odev) 866 return; 867 868 /* Tell syslog we are hosed. */ 869 dev_warn(&net->dev, "Tx timed out.\n"); 870 871 /* Tear the waiting frame off the list */ 872 if (odev->mux_bulk_tx_urb && 873 (odev->mux_bulk_tx_urb->status == -EINPROGRESS)) 874 usb_unlink_urb(odev->mux_bulk_tx_urb); 875 876 /* Update statistics */ 877 net->stats.tx_errors++; 878} 879 880/* make a real packet from the received USB buffer */ 881static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt, 882 unsigned int count, unsigned char is_eop) 883{ 884 unsigned short temp_bytes; 885 unsigned short buffer_offset = 0; 886 unsigned short frame_len; 887 unsigned char *tmp_rx_buf; 888 889 /* log if needed */ 890 D1("Rx %d bytes", count); 891 DUMP(ip_pkt, min(128, (int)count)); 892 893 while (count) { 894 switch (odev->rx_parse_state) { 895 case WAIT_IP: 896 /* waiting for IP header. */ 897 /* wanted bytes - size of ip header */ 898 temp_bytes = 899 (count < 900 odev->rx_buf_missing) ? count : odev-> 901 rx_buf_missing; 902 903 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) + 904 odev->rx_buf_size, ip_pkt + buffer_offset, 905 temp_bytes); 906 907 odev->rx_buf_size += temp_bytes; 908 buffer_offset += temp_bytes; 909 odev->rx_buf_missing -= temp_bytes; 910 count -= temp_bytes; 911 912 if (!odev->rx_buf_missing) { 913 /* header is complete allocate an sk_buffer and 914 * continue to WAIT_DATA */ 915 frame_len = ntohs(odev->rx_ip_hdr.tot_len); 916 917 if ((frame_len > DEFAULT_MRU) || 918 (frame_len < sizeof(struct iphdr))) { 919 dev_err(&odev->net->dev, 920 "Invalid frame (%d) length\n", 921 frame_len); 922 odev->rx_parse_state = WAIT_SYNC; 923 continue; 924 } 925 /* Allocate an sk_buff */ 926 odev->skb_rx_buf = netdev_alloc_skb(odev->net, 927 frame_len); 928 if (!odev->skb_rx_buf) { 929 /* We got no receive buffer. */ 930 D1("could not allocate memory"); 931 odev->rx_parse_state = WAIT_SYNC; 932 return; 933 } 934 935 /* Copy what we got so far. make room for iphdr 936 * after tail. */ 937 tmp_rx_buf = 938 skb_put(odev->skb_rx_buf, 939 sizeof(struct iphdr)); 940 memcpy(tmp_rx_buf, (char *)&(odev->rx_ip_hdr), 941 sizeof(struct iphdr)); 942 943 /* ETH_HLEN */ 944 odev->rx_buf_size = sizeof(struct iphdr); 945 946 /* Filip actually use .tot_len */ 947 odev->rx_buf_missing = 948 frame_len - sizeof(struct iphdr); 949 odev->rx_parse_state = WAIT_DATA; 950 } 951 break; 952 953 case WAIT_DATA: 954 temp_bytes = (count < odev->rx_buf_missing) 955 ? count : odev->rx_buf_missing; 956 957 /* Copy the rest of the bytes that are left in the 958 * buffer into the waiting sk_buf. */ 959 /* Make room for temp_bytes after tail. */ 960 tmp_rx_buf = skb_put(odev->skb_rx_buf, temp_bytes); 961 memcpy(tmp_rx_buf, ip_pkt + buffer_offset, temp_bytes); 962 963 odev->rx_buf_missing -= temp_bytes; 964 count -= temp_bytes; 965 buffer_offset += temp_bytes; 966 odev->rx_buf_size += temp_bytes; 967 if (!odev->rx_buf_missing) { 968 /* Packet is complete. Inject into stack. */ 969 /* We have IP packet here */ 970 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP); 971 /* don't check it */ 972 odev->skb_rx_buf->ip_summed = 973 CHECKSUM_UNNECESSARY; 974 975 skb_reset_mac_header(odev->skb_rx_buf); 976 977 /* Ship it off to the kernel */ 978 netif_rx(odev->skb_rx_buf); 979 /* No longer our buffer. */ 980 odev->skb_rx_buf = NULL; 981 982 /* update out statistics */ 983 odev->net->stats.rx_packets++; 984 985 odev->net->stats.rx_bytes += odev->rx_buf_size; 986 987 odev->rx_buf_size = 0; 988 odev->rx_buf_missing = sizeof(struct iphdr); 989 odev->rx_parse_state = WAIT_IP; 990 } 991 break; 992 993 case WAIT_SYNC: 994 D1(" W_S"); 995 count = 0; 996 break; 997 default: 998 D1(" "); 999 count--; 1000 break; 1001 } 1002 } 1003 1004 /* Recovery mechanism for WAIT_SYNC state. */ 1005 if (is_eop) { 1006 if (odev->rx_parse_state == WAIT_SYNC) { 1007 odev->rx_parse_state = WAIT_IP; 1008 odev->rx_buf_size = 0; 1009 odev->rx_buf_missing = sizeof(struct iphdr); 1010 } 1011 } 1012} 1013 1014/* Moving data from usb to kernel (in interrupt state) */ 1015static void read_bulk_callback(struct urb *urb) 1016{ 1017 struct hso_net *odev = urb->context; 1018 struct net_device *net; 1019 int result; 1020 int status = urb->status; 1021 1022 /* is al ok? (Filip: Who's Al ?) */ 1023 if (status) { 1024 handle_usb_error(status, __func__, odev->parent); 1025 return; 1026 } 1027 1028 /* Sanity check */ 1029 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) { 1030 D1("BULK IN callback but driver is not active!"); 1031 return; 1032 } 1033 usb_mark_last_busy(urb->dev); 1034 1035 net = odev->net; 1036 1037 if (!netif_device_present(net)) { 1038 /* Somebody killed our network interface... */ 1039 return; 1040 } 1041 1042 if (odev->parent->port_spec & HSO_INFO_CRC_BUG) { 1043 u32 rest; 1044 u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF }; 1045 rest = urb->actual_length % 1046 le16_to_cpu(odev->in_endp->wMaxPacketSize); 1047 if (((rest == 5) || (rest == 6)) && 1048 !memcmp(((u8 *) urb->transfer_buffer) + 1049 urb->actual_length - 4, crc_check, 4)) { 1050 urb->actual_length -= 4; 1051 } 1052 } 1053 1054 /* do we even have a packet? */ 1055 if (urb->actual_length) { 1056 /* Handle the IP stream, add header and push it onto network 1057 * stack if the packet is complete. */ 1058 spin_lock(&odev->net_lock); 1059 packetizeRx(odev, urb->transfer_buffer, urb->actual_length, 1060 (urb->transfer_buffer_length > 1061 urb->actual_length) ? 1 : 0); 1062 spin_unlock(&odev->net_lock); 1063 } 1064 1065 /* We are done with this URB, resubmit it. Prep the USB to wait for 1066 * another frame. Reuse same as received. */ 1067 usb_fill_bulk_urb(urb, 1068 odev->parent->usb, 1069 usb_rcvbulkpipe(odev->parent->usb, 1070 odev->in_endp-> 1071 bEndpointAddress & 0x7F), 1072 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE, 1073 read_bulk_callback, odev); 1074 1075 /* Give this to the USB subsystem so it can tell us when more data 1076 * arrives. */ 1077 result = usb_submit_urb(urb, GFP_ATOMIC); 1078 if (result) 1079 dev_warn(&odev->parent->interface->dev, 1080 "%s failed submit mux_bulk_rx_urb %d\n", __func__, 1081 result); 1082} 1083 1084/* Serial driver functions */ 1085 1086static void hso_init_termios(struct ktermios *termios) 1087{ 1088 /* 1089 * The default requirements for this device are: 1090 */ 1091 termios->c_iflag &= 1092 ~(IGNBRK /* disable ignore break */ 1093 | BRKINT /* disable break causes interrupt */ 1094 | PARMRK /* disable mark parity errors */ 1095 | ISTRIP /* disable clear high bit of input characters */ 1096 | INLCR /* disable translate NL to CR */ 1097 | IGNCR /* disable ignore CR */ 1098 | ICRNL /* disable translate CR to NL */ 1099 | IXON); /* disable enable XON/XOFF flow control */ 1100 1101 /* disable postprocess output characters */ 1102 termios->c_oflag &= ~OPOST; 1103 1104 termios->c_lflag &= 1105 ~(ECHO /* disable echo input characters */ 1106 | ECHONL /* disable echo new line */ 1107 | ICANON /* disable erase, kill, werase, and rprnt 1108 special characters */ 1109 | ISIG /* disable interrupt, quit, and suspend special 1110 characters */ 1111 | IEXTEN); /* disable non-POSIX special characters */ 1112 1113 termios->c_cflag &= 1114 ~(CSIZE /* no size */ 1115 | PARENB /* disable parity bit */ 1116 | CBAUD /* clear current baud rate */ 1117 | CBAUDEX); /* clear current buad rate */ 1118 1119 termios->c_cflag |= CS8; /* character size 8 bits */ 1120 1121 /* baud rate 115200 */ 1122 tty_termios_encode_baud_rate(termios, 115200, 115200); 1123} 1124 1125static void _hso_serial_set_termios(struct tty_struct *tty, 1126 struct ktermios *old) 1127{ 1128 struct hso_serial *serial = get_serial_by_tty(tty); 1129 struct ktermios *termios; 1130 1131 if (!serial) { 1132 printk(KERN_ERR "%s: no tty structures", __func__); 1133 return; 1134 } 1135 1136 D4("port %d", serial->minor); 1137 1138 /* 1139 * Fix up unsupported bits 1140 */ 1141 termios = tty->termios; 1142 termios->c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */ 1143 1144 termios->c_cflag &= 1145 ~(CSIZE /* no size */ 1146 | PARENB /* disable parity bit */ 1147 | CBAUD /* clear current baud rate */ 1148 | CBAUDEX); /* clear current buad rate */ 1149 1150 termios->c_cflag |= CS8; /* character size 8 bits */ 1151 1152 /* baud rate 115200 */ 1153 tty_encode_baud_rate(tty, 115200, 115200); 1154} 1155 1156static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb) 1157{ 1158 int result; 1159 /* We are done with this URB, resubmit it. Prep the USB to wait for 1160 * another frame */ 1161 usb_fill_bulk_urb(urb, serial->parent->usb, 1162 usb_rcvbulkpipe(serial->parent->usb, 1163 serial->in_endp-> 1164 bEndpointAddress & 0x7F), 1165 urb->transfer_buffer, serial->rx_data_length, 1166 hso_std_serial_read_bulk_callback, serial); 1167 /* Give this to the USB subsystem so it can tell us when more data 1168 * arrives. */ 1169 result = usb_submit_urb(urb, GFP_ATOMIC); 1170 if (result) { 1171 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n", 1172 __func__, result); 1173 } 1174} 1175 1176 1177 1178 1179static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial) 1180{ 1181 int count; 1182 struct urb *curr_urb; 1183 1184 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) { 1185 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx]; 1186 count = put_rxbuf_data(curr_urb, serial); 1187 if (count == -1) 1188 return; 1189 if (count == 0) { 1190 serial->curr_rx_urb_idx++; 1191 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs) 1192 serial->curr_rx_urb_idx = 0; 1193 hso_resubmit_rx_bulk_urb(serial, curr_urb); 1194 } 1195 } 1196} 1197 1198static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial) 1199{ 1200 int count = 0; 1201 struct urb *urb; 1202 1203 urb = serial->rx_urb[0]; 1204 if (serial->open_count > 0) { 1205 count = put_rxbuf_data(urb, serial); 1206 if (count == -1) 1207 return; 1208 } 1209 /* Re issue a read as long as we receive data. */ 1210 1211 if (count == 0 && ((urb->actual_length != 0) || 1212 (serial->rx_state == RX_PENDING))) { 1213 serial->rx_state = RX_SENT; 1214 hso_mux_serial_read(serial); 1215 } else 1216 serial->rx_state = RX_IDLE; 1217} 1218 1219 1220/* read callback for Diag and CS port */ 1221static void hso_std_serial_read_bulk_callback(struct urb *urb) 1222{ 1223 struct hso_serial *serial = urb->context; 1224 int status = urb->status; 1225 1226 /* sanity check */ 1227 if (!serial) { 1228 D1("serial == NULL"); 1229 return; 1230 } else if (status) { 1231 handle_usb_error(status, __func__, serial->parent); 1232 return; 1233 } 1234 1235 D4("\n--- Got serial_read_bulk callback %02x ---", status); 1236 D1("Actual length = %d\n", urb->actual_length); 1237 DUMP1(urb->transfer_buffer, urb->actual_length); 1238 1239 /* Anyone listening? */ 1240 if (serial->open_count == 0) 1241 return; 1242 1243 if (status == 0) { 1244 if (serial->parent->port_spec & HSO_INFO_CRC_BUG) { 1245 u32 rest; 1246 u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF }; 1247 rest = 1248 urb->actual_length % 1249 le16_to_cpu(serial->in_endp->wMaxPacketSize); 1250 if (((rest == 5) || (rest == 6)) && 1251 !memcmp(((u8 *) urb->transfer_buffer) + 1252 urb->actual_length - 4, crc_check, 4)) { 1253 urb->actual_length -= 4; 1254 } 1255 } 1256 /* Valid data, handle RX data */ 1257 spin_lock(&serial->serial_lock); 1258 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1; 1259 put_rxbuf_data_and_resubmit_bulk_urb(serial); 1260 spin_unlock(&serial->serial_lock); 1261 } else if (status == -ENOENT || status == -ECONNRESET) { 1262 /* Unlinked - check for throttled port. */ 1263 D2("Port %d, successfully unlinked urb", serial->minor); 1264 spin_lock(&serial->serial_lock); 1265 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0; 1266 hso_resubmit_rx_bulk_urb(serial, urb); 1267 spin_unlock(&serial->serial_lock); 1268 } else { 1269 D2("Port %d, status = %d for read urb", serial->minor, status); 1270 return; 1271 } 1272} 1273 1274/* 1275 * This needs to be a tasklet otherwise we will 1276 * end up recursively calling this function. 1277 */ 1278static void hso_unthrottle_tasklet(struct hso_serial *serial) 1279{ 1280 unsigned long flags; 1281 1282 spin_lock_irqsave(&serial->serial_lock, flags); 1283 if ((serial->parent->port_spec & HSO_INTF_MUX)) 1284 put_rxbuf_data_and_resubmit_ctrl_urb(serial); 1285 else 1286 put_rxbuf_data_and_resubmit_bulk_urb(serial); 1287 spin_unlock_irqrestore(&serial->serial_lock, flags); 1288} 1289 1290static void hso_unthrottle(struct tty_struct *tty) 1291{ 1292 struct hso_serial *serial = get_serial_by_tty(tty); 1293 1294 tasklet_hi_schedule(&serial->unthrottle_tasklet); 1295} 1296 1297static void hso_unthrottle_workfunc(struct work_struct *work) 1298{ 1299 struct hso_serial *serial = 1300 container_of(work, struct hso_serial, 1301 retry_unthrottle_workqueue); 1302 hso_unthrottle_tasklet(serial); 1303} 1304 1305/* open the requested serial port */ 1306static int hso_serial_open(struct tty_struct *tty, struct file *filp) 1307{ 1308 struct hso_serial *serial = get_serial_by_index(tty->index); 1309 int result; 1310 1311 /* sanity check */ 1312 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) { 1313 WARN_ON(1); 1314 tty->driver_data = NULL; 1315 D1("Failed to open port"); 1316 return -ENODEV; 1317 } 1318 1319 mutex_lock(&serial->parent->mutex); 1320 result = usb_autopm_get_interface(serial->parent->interface); 1321 if (result < 0) 1322 goto err_out; 1323 1324 D1("Opening %d", serial->minor); 1325 kref_get(&serial->parent->ref); 1326 1327 /* setup */ 1328 spin_lock_irq(&serial->serial_lock); 1329 tty->driver_data = serial; 1330 tty_kref_put(serial->tty); 1331 serial->tty = tty_kref_get(tty); 1332 spin_unlock_irq(&serial->serial_lock); 1333 1334 /* check for port already opened, if not set the termios */ 1335 serial->open_count++; 1336 if (serial->open_count == 1) { 1337 serial->rx_state = RX_IDLE; 1338 /* Force default termio settings */ 1339 _hso_serial_set_termios(tty, NULL); 1340 tasklet_init(&serial->unthrottle_tasklet, 1341 (void (*)(unsigned long))hso_unthrottle_tasklet, 1342 (unsigned long)serial); 1343 INIT_WORK(&serial->retry_unthrottle_workqueue, 1344 hso_unthrottle_workfunc); 1345 result = hso_start_serial_device(serial->parent, GFP_KERNEL); 1346 if (result) { 1347 hso_stop_serial_device(serial->parent); 1348 serial->open_count--; 1349 kref_put(&serial->parent->ref, hso_serial_ref_free); 1350 } 1351 } else { 1352 D1("Port was already open"); 1353 } 1354 1355 usb_autopm_put_interface(serial->parent->interface); 1356 1357 /* done */ 1358 if (result) 1359 hso_serial_tiocmset(tty, NULL, TIOCM_RTS | TIOCM_DTR, 0); 1360err_out: 1361 mutex_unlock(&serial->parent->mutex); 1362 return result; 1363} 1364 1365/* close the requested serial port */ 1366static void hso_serial_close(struct tty_struct *tty, struct file *filp) 1367{ 1368 struct hso_serial *serial = tty->driver_data; 1369 u8 usb_gone; 1370 1371 D1("Closing serial port"); 1372 1373 /* Open failed, no close cleanup required */ 1374 if (serial == NULL) 1375 return; 1376 1377 mutex_lock(&serial->parent->mutex); 1378 usb_gone = serial->parent->usb_gone; 1379 1380 if (!usb_gone) 1381 usb_autopm_get_interface(serial->parent->interface); 1382 1383 /* reset the rts and dtr */ 1384 /* do the actual close */ 1385 serial->open_count--; 1386 1387 if (serial->open_count <= 0) { 1388 serial->open_count = 0; 1389 spin_lock_irq(&serial->serial_lock); 1390 if (serial->tty == tty) { 1391 serial->tty->driver_data = NULL; 1392 serial->tty = NULL; 1393 tty_kref_put(tty); 1394 } 1395 spin_unlock_irq(&serial->serial_lock); 1396 if (!usb_gone) 1397 hso_stop_serial_device(serial->parent); 1398 tasklet_kill(&serial->unthrottle_tasklet); 1399 cancel_work_sync(&serial->retry_unthrottle_workqueue); 1400 } 1401 1402 if (!usb_gone) 1403 usb_autopm_put_interface(serial->parent->interface); 1404 1405 mutex_unlock(&serial->parent->mutex); 1406 1407 kref_put(&serial->parent->ref, hso_serial_ref_free); 1408} 1409 1410/* close the requested serial port */ 1411static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf, 1412 int count) 1413{ 1414 struct hso_serial *serial = get_serial_by_tty(tty); 1415 int space, tx_bytes; 1416 unsigned long flags; 1417 1418 /* sanity check */ 1419 if (serial == NULL) { 1420 printk(KERN_ERR "%s: serial is NULL\n", __func__); 1421 return -ENODEV; 1422 } 1423 1424 spin_lock_irqsave(&serial->serial_lock, flags); 1425 1426 space = serial->tx_data_length - serial->tx_buffer_count; 1427 tx_bytes = (count < space) ? count : space; 1428 1429 if (!tx_bytes) 1430 goto out; 1431 1432 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes); 1433 serial->tx_buffer_count += tx_bytes; 1434 1435out: 1436 spin_unlock_irqrestore(&serial->serial_lock, flags); 1437 1438 hso_kick_transmit(serial); 1439 /* done */ 1440 return tx_bytes; 1441} 1442 1443/* how much room is there for writing */ 1444static int hso_serial_write_room(struct tty_struct *tty) 1445{ 1446 struct hso_serial *serial = get_serial_by_tty(tty); 1447 int room; 1448 unsigned long flags; 1449 1450 spin_lock_irqsave(&serial->serial_lock, flags); 1451 room = serial->tx_data_length - serial->tx_buffer_count; 1452 spin_unlock_irqrestore(&serial->serial_lock, flags); 1453 1454 /* return free room */ 1455 return room; 1456} 1457 1458/* setup the term */ 1459static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old) 1460{ 1461 struct hso_serial *serial = get_serial_by_tty(tty); 1462 unsigned long flags; 1463 1464 if (old) 1465 D5("Termios called with: cflags new[%d] - old[%d]", 1466 tty->termios->c_cflag, old->c_cflag); 1467 1468 /* the actual setup */ 1469 spin_lock_irqsave(&serial->serial_lock, flags); 1470 if (serial->open_count) 1471 _hso_serial_set_termios(tty, old); 1472 else 1473 tty->termios = old; 1474 spin_unlock_irqrestore(&serial->serial_lock, flags); 1475 1476 /* done */ 1477} 1478 1479/* how many characters in the buffer */ 1480static int hso_serial_chars_in_buffer(struct tty_struct *tty) 1481{ 1482 struct hso_serial *serial = get_serial_by_tty(tty); 1483 int chars; 1484 unsigned long flags; 1485 1486 /* sanity check */ 1487 if (serial == NULL) 1488 return 0; 1489 1490 spin_lock_irqsave(&serial->serial_lock, flags); 1491 chars = serial->tx_buffer_count; 1492 spin_unlock_irqrestore(&serial->serial_lock, flags); 1493 1494 return chars; 1495} 1496static int tiocmget_submit_urb(struct hso_serial *serial, 1497 struct hso_tiocmget *tiocmget, 1498 struct usb_device *usb) 1499{ 1500 int result; 1501 1502 if (serial->parent->usb_gone) 1503 return -ENODEV; 1504 usb_fill_int_urb(tiocmget->urb, usb, 1505 usb_rcvintpipe(usb, 1506 tiocmget->endp-> 1507 bEndpointAddress & 0x7F), 1508 &tiocmget->serial_state_notification, 1509 sizeof(struct hso_serial_state_notification), 1510 tiocmget_intr_callback, serial, 1511 tiocmget->endp->bInterval); 1512 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC); 1513 if (result) { 1514 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__, 1515 result); 1516 } 1517 return result; 1518 1519} 1520 1521static void tiocmget_intr_callback(struct urb *urb) 1522{ 1523 struct hso_serial *serial = urb->context; 1524 struct hso_tiocmget *tiocmget; 1525 int status = urb->status; 1526 u16 UART_state_bitmap, prev_UART_state_bitmap; 1527 struct uart_icount *icount; 1528 struct hso_serial_state_notification *serial_state_notification; 1529 struct usb_device *usb; 1530 1531 /* Sanity checks */ 1532 if (!serial) 1533 return; 1534 if (status) { 1535 handle_usb_error(status, __func__, serial->parent); 1536 return; 1537 } 1538 tiocmget = serial->tiocmget; 1539 if (!tiocmget) 1540 return; 1541 usb = serial->parent->usb; 1542 serial_state_notification = &tiocmget->serial_state_notification; 1543 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE || 1544 serial_state_notification->bNotification != B_NOTIFICATION || 1545 le16_to_cpu(serial_state_notification->wValue) != W_VALUE || 1546 le16_to_cpu(serial_state_notification->wIndex) != W_INDEX || 1547 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) { 1548 dev_warn(&usb->dev, 1549 "hso received invalid serial state notification\n"); 1550 DUMP(serial_state_notification, 1551 sizeof(struct hso_serial_state_notification)); 1552 } else { 1553 1554 UART_state_bitmap = le16_to_cpu(serial_state_notification-> 1555 UART_state_bitmap); 1556 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap; 1557 icount = &tiocmget->icount; 1558 spin_lock(&serial->serial_lock); 1559 if ((UART_state_bitmap & B_OVERRUN) != 1560 (prev_UART_state_bitmap & B_OVERRUN)) 1561 icount->parity++; 1562 if ((UART_state_bitmap & B_PARITY) != 1563 (prev_UART_state_bitmap & B_PARITY)) 1564 icount->parity++; 1565 if ((UART_state_bitmap & B_FRAMING) != 1566 (prev_UART_state_bitmap & B_FRAMING)) 1567 icount->frame++; 1568 if ((UART_state_bitmap & B_RING_SIGNAL) && 1569 !(prev_UART_state_bitmap & B_RING_SIGNAL)) 1570 icount->rng++; 1571 if ((UART_state_bitmap & B_BREAK) != 1572 (prev_UART_state_bitmap & B_BREAK)) 1573 icount->brk++; 1574 if ((UART_state_bitmap & B_TX_CARRIER) != 1575 (prev_UART_state_bitmap & B_TX_CARRIER)) 1576 icount->dsr++; 1577 if ((UART_state_bitmap & B_RX_CARRIER) != 1578 (prev_UART_state_bitmap & B_RX_CARRIER)) 1579 icount->dcd++; 1580 tiocmget->prev_UART_state_bitmap = UART_state_bitmap; 1581 spin_unlock(&serial->serial_lock); 1582 tiocmget->intr_completed = 1; 1583 wake_up_interruptible(&tiocmget->waitq); 1584 } 1585 memset(serial_state_notification, 0, 1586 sizeof(struct hso_serial_state_notification)); 1587 tiocmget_submit_urb(serial, 1588 tiocmget, 1589 serial->parent->usb); 1590} 1591 1592/* 1593 * next few functions largely stolen from drivers/serial/serial_core.c 1594 */ 1595/* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1596 * - mask passed in arg for lines of interest 1597 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1598 * Caller should use TIOCGICOUNT to see which one it was 1599 */ 1600static int 1601hso_wait_modem_status(struct hso_serial *serial, unsigned long arg) 1602{ 1603 DECLARE_WAITQUEUE(wait, current); 1604 struct uart_icount cprev, cnow; 1605 struct hso_tiocmget *tiocmget; 1606 int ret; 1607 1608 tiocmget = serial->tiocmget; 1609 if (!tiocmget) 1610 return -ENOENT; 1611 /* 1612 * note the counters on entry 1613 */ 1614 spin_lock_irq(&serial->serial_lock); 1615 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount)); 1616 spin_unlock_irq(&serial->serial_lock); 1617 add_wait_queue(&tiocmget->waitq, &wait); 1618 for (;;) { 1619 spin_lock_irq(&serial->serial_lock); 1620 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount)); 1621 spin_unlock_irq(&serial->serial_lock); 1622 set_current_state(TASK_INTERRUPTIBLE); 1623 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1624 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1625 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) { 1626 ret = 0; 1627 break; 1628 } 1629 schedule(); 1630 /* see if a signal did it */ 1631 if (signal_pending(current)) { 1632 ret = -ERESTARTSYS; 1633 break; 1634 } 1635 cprev = cnow; 1636 } 1637 current->state = TASK_RUNNING; 1638 remove_wait_queue(&tiocmget->waitq, &wait); 1639 1640 return ret; 1641} 1642 1643/* 1644 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1645 * Return: write counters to the user passed counter struct 1646 * NB: both 1->0 and 0->1 transitions are counted except for 1647 * RI where only 0->1 is counted. 1648 */ 1649static int hso_get_count(struct hso_serial *serial, 1650 struct serial_icounter_struct __user *icnt) 1651{ 1652 struct serial_icounter_struct icount; 1653 struct uart_icount cnow; 1654 struct hso_tiocmget *tiocmget = serial->tiocmget; 1655 1656 if (!tiocmget) 1657 return -ENOENT; 1658 spin_lock_irq(&serial->serial_lock); 1659 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount)); 1660 spin_unlock_irq(&serial->serial_lock); 1661 1662 icount.cts = cnow.cts; 1663 icount.dsr = cnow.dsr; 1664 icount.rng = cnow.rng; 1665 icount.dcd = cnow.dcd; 1666 icount.rx = cnow.rx; 1667 icount.tx = cnow.tx; 1668 icount.frame = cnow.frame; 1669 icount.overrun = cnow.overrun; 1670 icount.parity = cnow.parity; 1671 icount.brk = cnow.brk; 1672 icount.buf_overrun = cnow.buf_overrun; 1673 1674 return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0; 1675} 1676 1677 1678static int hso_serial_tiocmget(struct tty_struct *tty, struct file *file) 1679{ 1680 int retval; 1681 struct hso_serial *serial = get_serial_by_tty(tty); 1682 struct hso_tiocmget *tiocmget; 1683 u16 UART_state_bitmap; 1684 1685 /* sanity check */ 1686 if (!serial) { 1687 D1("no tty structures"); 1688 return -EINVAL; 1689 } 1690 spin_lock_irq(&serial->serial_lock); 1691 retval = ((serial->rts_state) ? TIOCM_RTS : 0) | 1692 ((serial->dtr_state) ? TIOCM_DTR : 0); 1693 tiocmget = serial->tiocmget; 1694 if (tiocmget) { 1695 1696 UART_state_bitmap = le16_to_cpu( 1697 tiocmget->prev_UART_state_bitmap); 1698 if (UART_state_bitmap & B_RING_SIGNAL) 1699 retval |= TIOCM_RNG; 1700 if (UART_state_bitmap & B_RX_CARRIER) 1701 retval |= TIOCM_CD; 1702 if (UART_state_bitmap & B_TX_CARRIER) 1703 retval |= TIOCM_DSR; 1704 } 1705 spin_unlock_irq(&serial->serial_lock); 1706 return retval; 1707} 1708 1709static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file, 1710 unsigned int set, unsigned int clear) 1711{ 1712 int val = 0; 1713 unsigned long flags; 1714 int if_num; 1715 struct hso_serial *serial = get_serial_by_tty(tty); 1716 1717 /* sanity check */ 1718 if (!serial) { 1719 D1("no tty structures"); 1720 return -EINVAL; 1721 } 1722 1723 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM) 1724 return -EINVAL; 1725 1726 if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber; 1727 1728 spin_lock_irqsave(&serial->serial_lock, flags); 1729 if (set & TIOCM_RTS) 1730 serial->rts_state = 1; 1731 if (set & TIOCM_DTR) 1732 serial->dtr_state = 1; 1733 1734 if (clear & TIOCM_RTS) 1735 serial->rts_state = 0; 1736 if (clear & TIOCM_DTR) 1737 serial->dtr_state = 0; 1738 1739 if (serial->dtr_state) 1740 val |= 0x01; 1741 if (serial->rts_state) 1742 val |= 0x02; 1743 1744 spin_unlock_irqrestore(&serial->serial_lock, flags); 1745 1746 return usb_control_msg(serial->parent->usb, 1747 usb_rcvctrlpipe(serial->parent->usb, 0), 0x22, 1748 0x21, val, if_num, NULL, 0, 1749 USB_CTRL_SET_TIMEOUT); 1750} 1751 1752static int hso_serial_ioctl(struct tty_struct *tty, struct file *file, 1753 unsigned int cmd, unsigned long arg) 1754{ 1755 struct hso_serial *serial = get_serial_by_tty(tty); 1756 void __user *uarg = (void __user *)arg; 1757 int ret = 0; 1758 D4("IOCTL cmd: %d, arg: %ld", cmd, arg); 1759 1760 if (!serial) 1761 return -ENODEV; 1762 switch (cmd) { 1763 case TIOCMIWAIT: 1764 ret = hso_wait_modem_status(serial, arg); 1765 break; 1766 1767 case TIOCGICOUNT: 1768 ret = hso_get_count(serial, uarg); 1769 break; 1770 default: 1771 ret = -ENOIOCTLCMD; 1772 break; 1773 } 1774 return ret; 1775} 1776 1777 1778/* starts a transmit */ 1779static void hso_kick_transmit(struct hso_serial *serial) 1780{ 1781 u8 *temp; 1782 unsigned long flags; 1783 int res; 1784 1785 spin_lock_irqsave(&serial->serial_lock, flags); 1786 if (!serial->tx_buffer_count) 1787 goto out; 1788 1789 if (serial->tx_urb_used) 1790 goto out; 1791 1792 /* Wakeup USB interface if necessary */ 1793 if (hso_get_activity(serial->parent) == -EAGAIN) 1794 goto out; 1795 1796 /* Switch pointers around to avoid memcpy */ 1797 temp = serial->tx_buffer; 1798 serial->tx_buffer = serial->tx_data; 1799 serial->tx_data = temp; 1800 serial->tx_data_count = serial->tx_buffer_count; 1801 serial->tx_buffer_count = 0; 1802 1803 /* If temp is set, it means we switched buffers */ 1804 if (temp && serial->write_data) { 1805 res = serial->write_data(serial); 1806 if (res >= 0) 1807 serial->tx_urb_used = 1; 1808 } 1809out: 1810 spin_unlock_irqrestore(&serial->serial_lock, flags); 1811} 1812 1813/* make a request (for reading and writing data to muxed serial port) */ 1814static int mux_device_request(struct hso_serial *serial, u8 type, u16 port, 1815 struct urb *ctrl_urb, 1816 struct usb_ctrlrequest *ctrl_req, 1817 u8 *ctrl_urb_data, u32 size) 1818{ 1819 int result; 1820 int pipe; 1821 1822 /* Sanity check */ 1823 if (!serial || !ctrl_urb || !ctrl_req) { 1824 printk(KERN_ERR "%s: Wrong arguments\n", __func__); 1825 return -EINVAL; 1826 } 1827 1828 /* initialize */ 1829 ctrl_req->wValue = 0; 1830 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port)); 1831 ctrl_req->wLength = cpu_to_le16(size); 1832 1833 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) { 1834 /* Reading command */ 1835 ctrl_req->bRequestType = USB_DIR_IN | 1836 USB_TYPE_OPTION_VENDOR | 1837 USB_RECIP_INTERFACE; 1838 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; 1839 pipe = usb_rcvctrlpipe(serial->parent->usb, 0); 1840 } else { 1841 /* Writing command */ 1842 ctrl_req->bRequestType = USB_DIR_OUT | 1843 USB_TYPE_OPTION_VENDOR | 1844 USB_RECIP_INTERFACE; 1845 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; 1846 pipe = usb_sndctrlpipe(serial->parent->usb, 0); 1847 } 1848 /* syslog */ 1849 D2("%s command (%02x) len: %d, port: %d", 1850 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write", 1851 ctrl_req->bRequestType, ctrl_req->wLength, port); 1852 1853 /* Load ctrl urb */ 1854 ctrl_urb->transfer_flags = 0; 1855 usb_fill_control_urb(ctrl_urb, 1856 serial->parent->usb, 1857 pipe, 1858 (u8 *) ctrl_req, 1859 ctrl_urb_data, size, ctrl_callback, serial); 1860 /* Send it on merry way */ 1861 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC); 1862 if (result) { 1863 dev_err(&ctrl_urb->dev->dev, 1864 "%s failed submit ctrl_urb %d type %d\n", __func__, 1865 result, type); 1866 return result; 1867 } 1868 1869 /* done */ 1870 return size; 1871} 1872 1873/* called by intr_callback when read occurs */ 1874static int hso_mux_serial_read(struct hso_serial *serial) 1875{ 1876 if (!serial) 1877 return -EINVAL; 1878 1879 /* clean data */ 1880 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE); 1881 /* make the request */ 1882 1883 if (serial->num_rx_urbs != 1) { 1884 dev_err(&serial->parent->interface->dev, 1885 "ERROR: mux'd reads with multiple buffers " 1886 "not possible\n"); 1887 return 0; 1888 } 1889 return mux_device_request(serial, 1890 USB_CDC_GET_ENCAPSULATED_RESPONSE, 1891 serial->parent->port_spec & HSO_PORT_MASK, 1892 serial->rx_urb[0], 1893 &serial->ctrl_req_rx, 1894 serial->rx_data[0], serial->rx_data_length); 1895} 1896 1897/* used for muxed serial port callback (muxed serial read) */ 1898static void intr_callback(struct urb *urb) 1899{ 1900 struct hso_shared_int *shared_int = urb->context; 1901 struct hso_serial *serial; 1902 unsigned char *port_req; 1903 int status = urb->status; 1904 int i; 1905 1906 usb_mark_last_busy(urb->dev); 1907 1908 /* sanity check */ 1909 if (!shared_int) 1910 return; 1911 1912 /* status check */ 1913 if (status) { 1914 handle_usb_error(status, __func__, NULL); 1915 return; 1916 } 1917 D4("\n--- Got intr callback 0x%02X ---", status); 1918 1919 /* what request? */ 1920 port_req = urb->transfer_buffer; 1921 D4(" port_req = 0x%.2X\n", *port_req); 1922 /* loop over all muxed ports to find the one sending this */ 1923 for (i = 0; i < 8; i++) { 1924 /* max 8 channels on MUX */ 1925 if (*port_req & (1 << i)) { 1926 serial = get_serial_by_shared_int_and_type(shared_int, 1927 (1 << i)); 1928 if (serial != NULL) { 1929 D1("Pending read interrupt on port %d\n", i); 1930 spin_lock(&serial->serial_lock); 1931 if (serial->rx_state == RX_IDLE && 1932 serial->open_count > 0) { 1933 /* Setup and send a ctrl req read on 1934 * port i */ 1935 if (!serial->rx_urb_filled[0]) { 1936 serial->rx_state = RX_SENT; 1937 hso_mux_serial_read(serial); 1938 } else 1939 serial->rx_state = RX_PENDING; 1940 } else { 1941 D1("Already a read pending on " 1942 "port %d or port not open\n", i); 1943 } 1944 spin_unlock(&serial->serial_lock); 1945 } 1946 } 1947 } 1948 /* Resubmit interrupt urb */ 1949 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC); 1950} 1951 1952/* called for writing to muxed serial port */ 1953static int hso_mux_serial_write_data(struct hso_serial *serial) 1954{ 1955 if (NULL == serial) 1956 return -EINVAL; 1957 1958 return mux_device_request(serial, 1959 USB_CDC_SEND_ENCAPSULATED_COMMAND, 1960 serial->parent->port_spec & HSO_PORT_MASK, 1961 serial->tx_urb, 1962 &serial->ctrl_req_tx, 1963 serial->tx_data, serial->tx_data_count); 1964} 1965 1966/* write callback for Diag and CS port */ 1967static void hso_std_serial_write_bulk_callback(struct urb *urb) 1968{ 1969 struct hso_serial *serial = urb->context; 1970 int status = urb->status; 1971 struct tty_struct *tty; 1972 1973 /* sanity check */ 1974 if (!serial) { 1975 D1("serial == NULL"); 1976 return; 1977 } 1978 1979 spin_lock(&serial->serial_lock); 1980 serial->tx_urb_used = 0; 1981 tty = tty_kref_get(serial->tty); 1982 spin_unlock(&serial->serial_lock); 1983 if (status) { 1984 handle_usb_error(status, __func__, serial->parent); 1985 tty_kref_put(tty); 1986 return; 1987 } 1988 hso_put_activity(serial->parent); 1989 if (tty) { 1990 tty_wakeup(tty); 1991 tty_kref_put(tty); 1992 } 1993 hso_kick_transmit(serial); 1994 1995 D1(" "); 1996} 1997 1998/* called for writing diag or CS serial port */ 1999static int hso_std_serial_write_data(struct hso_serial *serial) 2000{ 2001 int count = serial->tx_data_count; 2002 int result; 2003 2004 usb_fill_bulk_urb(serial->tx_urb, 2005 serial->parent->usb, 2006 usb_sndbulkpipe(serial->parent->usb, 2007 serial->out_endp-> 2008 bEndpointAddress & 0x7F), 2009 serial->tx_data, serial->tx_data_count, 2010 hso_std_serial_write_bulk_callback, serial); 2011 2012 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC); 2013 if (result) { 2014 dev_warn(&serial->parent->usb->dev, 2015 "Failed to submit urb - res %d\n", result); 2016 return result; 2017 } 2018 2019 return count; 2020} 2021 2022/* callback after read or write on muxed serial port */ 2023static void ctrl_callback(struct urb *urb) 2024{ 2025 struct hso_serial *serial = urb->context; 2026 struct usb_ctrlrequest *req; 2027 int status = urb->status; 2028 struct tty_struct *tty; 2029 2030 /* sanity check */ 2031 if (!serial) 2032 return; 2033 2034 spin_lock(&serial->serial_lock); 2035 serial->tx_urb_used = 0; 2036 tty = tty_kref_get(serial->tty); 2037 spin_unlock(&serial->serial_lock); 2038 if (status) { 2039 handle_usb_error(status, __func__, serial->parent); 2040 tty_kref_put(tty); 2041 return; 2042 } 2043 2044 /* what request? */ 2045 req = (struct usb_ctrlrequest *)(urb->setup_packet); 2046 D4("\n--- Got muxed ctrl callback 0x%02X ---", status); 2047 D4("Actual length of urb = %d\n", urb->actual_length); 2048 DUMP1(urb->transfer_buffer, urb->actual_length); 2049 2050 if (req->bRequestType == 2051 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) { 2052 /* response to a read command */ 2053 serial->rx_urb_filled[0] = 1; 2054 spin_lock(&serial->serial_lock); 2055 put_rxbuf_data_and_resubmit_ctrl_urb(serial); 2056 spin_unlock(&serial->serial_lock); 2057 } else { 2058 hso_put_activity(serial->parent); 2059 if (tty) 2060 tty_wakeup(tty); 2061 /* response to a write command */ 2062 hso_kick_transmit(serial); 2063 } 2064 tty_kref_put(tty); 2065} 2066 2067/* handle RX data for serial port */ 2068static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial) 2069{ 2070 struct tty_struct *tty; 2071 int write_length_remaining = 0; 2072 int curr_write_len; 2073 2074 /* Sanity check */ 2075 if (urb == NULL || serial == NULL) { 2076 D1("serial = NULL"); 2077 return -2; 2078 } 2079 2080 /* All callers to put_rxbuf_data hold serial_lock */ 2081 tty = tty_kref_get(serial->tty); 2082 2083 /* Push data to tty */ 2084 if (tty) { 2085 write_length_remaining = urb->actual_length - 2086 serial->curr_rx_urb_offset; 2087 D1("data to push to tty"); 2088 while (write_length_remaining) { 2089 if (test_bit(TTY_THROTTLED, &tty->flags)) { 2090 tty_kref_put(tty); 2091 return -1; 2092 } 2093 curr_write_len = tty_insert_flip_string 2094 (tty, urb->transfer_buffer + 2095 serial->curr_rx_urb_offset, 2096 write_length_remaining); 2097 serial->curr_rx_urb_offset += curr_write_len; 2098 write_length_remaining -= curr_write_len; 2099 tty_flip_buffer_push(tty); 2100 } 2101 } 2102 if (write_length_remaining == 0) { 2103 serial->curr_rx_urb_offset = 0; 2104 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0; 2105 } 2106 tty_kref_put(tty); 2107 return write_length_remaining; 2108} 2109 2110 2111/* Base driver functions */ 2112 2113static void hso_log_port(struct hso_device *hso_dev) 2114{ 2115 char *port_type; 2116 char port_dev[20]; 2117 2118 switch (hso_dev->port_spec & HSO_PORT_MASK) { 2119 case HSO_PORT_CONTROL: 2120 port_type = "Control"; 2121 break; 2122 case HSO_PORT_APP: 2123 port_type = "Application"; 2124 break; 2125 case HSO_PORT_GPS: 2126 port_type = "GPS"; 2127 break; 2128 case HSO_PORT_GPS_CONTROL: 2129 port_type = "GPS control"; 2130 break; 2131 case HSO_PORT_APP2: 2132 port_type = "Application2"; 2133 break; 2134 case HSO_PORT_PCSC: 2135 port_type = "PCSC"; 2136 break; 2137 case HSO_PORT_DIAG: 2138 port_type = "Diagnostic"; 2139 break; 2140 case HSO_PORT_DIAG2: 2141 port_type = "Diagnostic2"; 2142 break; 2143 case HSO_PORT_MODEM: 2144 port_type = "Modem"; 2145 break; 2146 case HSO_PORT_NETWORK: 2147 port_type = "Network"; 2148 break; 2149 default: 2150 port_type = "Unknown"; 2151 break; 2152 } 2153 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) { 2154 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name); 2155 } else 2156 sprintf(port_dev, "/dev/%s%d", tty_filename, 2157 dev2ser(hso_dev)->minor); 2158 2159 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n", 2160 port_type, port_dev); 2161} 2162 2163static int hso_start_net_device(struct hso_device *hso_dev) 2164{ 2165 int i, result = 0; 2166 struct hso_net *hso_net = dev2net(hso_dev); 2167 2168 if (!hso_net) 2169 return -ENODEV; 2170 2171 /* send URBs for all read buffers */ 2172 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) { 2173 2174 /* Prep a receive URB */ 2175 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i], 2176 hso_dev->usb, 2177 usb_rcvbulkpipe(hso_dev->usb, 2178 hso_net->in_endp-> 2179 bEndpointAddress & 0x7F), 2180 hso_net->mux_bulk_rx_buf_pool[i], 2181 MUX_BULK_RX_BUF_SIZE, read_bulk_callback, 2182 hso_net); 2183 2184 /* Put it out there so the device can send us stuff */ 2185 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i], 2186 GFP_NOIO); 2187 if (result) 2188 dev_warn(&hso_dev->usb->dev, 2189 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__, 2190 i, result); 2191 } 2192 2193 return result; 2194} 2195 2196static int hso_stop_net_device(struct hso_device *hso_dev) 2197{ 2198 int i; 2199 struct hso_net *hso_net = dev2net(hso_dev); 2200 2201 if (!hso_net) 2202 return -ENODEV; 2203 2204 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) { 2205 if (hso_net->mux_bulk_rx_urb_pool[i]) 2206 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]); 2207 2208 } 2209 if (hso_net->mux_bulk_tx_urb) 2210 usb_kill_urb(hso_net->mux_bulk_tx_urb); 2211 2212 return 0; 2213} 2214 2215static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags) 2216{ 2217 int i, result = 0; 2218 struct hso_serial *serial = dev2ser(hso_dev); 2219 2220 if (!serial) 2221 return -ENODEV; 2222 2223 /* If it is not the MUX port fill in and submit a bulk urb (already 2224 * allocated in hso_serial_start) */ 2225 if (!(serial->parent->port_spec & HSO_INTF_MUX)) { 2226 for (i = 0; i < serial->num_rx_urbs; i++) { 2227 usb_fill_bulk_urb(serial->rx_urb[i], 2228 serial->parent->usb, 2229 usb_rcvbulkpipe(serial->parent->usb, 2230 serial->in_endp-> 2231 bEndpointAddress & 2232 0x7F), 2233 serial->rx_data[i], 2234 serial->rx_data_length, 2235 hso_std_serial_read_bulk_callback, 2236 serial); 2237 result = usb_submit_urb(serial->rx_urb[i], flags); 2238 if (result) { 2239 dev_warn(&serial->parent->usb->dev, 2240 "Failed to submit urb - res %d\n", 2241 result); 2242 break; 2243 } 2244 } 2245 } else { 2246 mutex_lock(&serial->shared_int->shared_int_lock); 2247 if (!serial->shared_int->use_count) { 2248 result = 2249 hso_mux_submit_intr_urb(serial->shared_int, 2250 hso_dev->usb, flags); 2251 } 2252 serial->shared_int->use_count++; 2253 mutex_unlock(&serial->shared_int->shared_int_lock); 2254 } 2255 if (serial->tiocmget) 2256 tiocmget_submit_urb(serial, 2257 serial->tiocmget, 2258 serial->parent->usb); 2259 return result; 2260} 2261 2262static int hso_stop_serial_device(struct hso_device *hso_dev) 2263{ 2264 int i; 2265 struct hso_serial *serial = dev2ser(hso_dev); 2266 struct hso_tiocmget *tiocmget; 2267 2268 if (!serial) 2269 return -ENODEV; 2270 2271 for (i = 0; i < serial->num_rx_urbs; i++) { 2272 if (serial->rx_urb[i]) { 2273 usb_kill_urb(serial->rx_urb[i]); 2274 serial->rx_urb_filled[i] = 0; 2275 } 2276 } 2277 serial->curr_rx_urb_idx = 0; 2278 serial->curr_rx_urb_offset = 0; 2279 2280 if (serial->tx_urb) 2281 usb_kill_urb(serial->tx_urb); 2282 2283 if (serial->shared_int) { 2284 mutex_lock(&serial->shared_int->shared_int_lock); 2285 if (serial->shared_int->use_count && 2286 (--serial->shared_int->use_count == 0)) { 2287 struct urb *urb; 2288 2289 urb = serial->shared_int->shared_intr_urb; 2290 if (urb) 2291 usb_kill_urb(urb); 2292 } 2293 mutex_unlock(&serial->shared_int->shared_int_lock); 2294 } 2295 tiocmget = serial->tiocmget; 2296 if (tiocmget) { 2297 wake_up_interruptible(&tiocmget->waitq); 2298 usb_kill_urb(tiocmget->urb); 2299 } 2300 2301 return 0; 2302} 2303 2304static void hso_serial_common_free(struct hso_serial *serial) 2305{ 2306 int i; 2307 2308 if (serial->parent->dev) 2309 device_remove_file(serial->parent->dev, &dev_attr_hsotype); 2310 2311 tty_unregister_device(tty_drv, serial->minor); 2312 2313 for (i = 0; i < serial->num_rx_urbs; i++) { 2314 /* unlink and free RX URB */ 2315 usb_free_urb(serial->rx_urb[i]); 2316 /* free the RX buffer */ 2317 kfree(serial->rx_data[i]); 2318 } 2319 2320 /* unlink and free TX URB */ 2321 usb_free_urb(serial->tx_urb); 2322 kfree(serial->tx_data); 2323} 2324 2325static int hso_serial_common_create(struct hso_serial *serial, int num_urbs, 2326 int rx_size, int tx_size) 2327{ 2328 struct device *dev; 2329 int minor; 2330 int i; 2331 2332 minor = get_free_serial_index(); 2333 if (minor < 0) 2334 goto exit; 2335 2336 /* register our minor number */ 2337 serial->parent->dev = tty_register_device(tty_drv, minor, 2338 &serial->parent->interface->dev); 2339 dev = serial->parent->dev; 2340 dev_set_drvdata(dev, serial->parent); 2341 i = device_create_file(dev, &dev_attr_hsotype); 2342 2343 /* fill in specific data for later use */ 2344 serial->minor = minor; 2345 serial->magic = HSO_SERIAL_MAGIC; 2346 spin_lock_init(&serial->serial_lock); 2347 serial->num_rx_urbs = num_urbs; 2348 2349 /* RX, allocate urb and initialize */ 2350 2351 /* prepare our RX buffer */ 2352 serial->rx_data_length = rx_size; 2353 for (i = 0; i < serial->num_rx_urbs; i++) { 2354 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); 2355 if (!serial->rx_urb[i]) { 2356 dev_err(dev, "Could not allocate urb?\n"); 2357 goto exit; 2358 } 2359 serial->rx_urb[i]->transfer_buffer = NULL; 2360 serial->rx_urb[i]->transfer_buffer_length = 0; 2361 serial->rx_data[i] = kzalloc(serial->rx_data_length, 2362 GFP_KERNEL); 2363 if (!serial->rx_data[i]) { 2364 dev_err(dev, "%s - Out of memory\n", __func__); 2365 goto exit; 2366 } 2367 } 2368 2369 /* TX, allocate urb and initialize */ 2370 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL); 2371 if (!serial->tx_urb) { 2372 dev_err(dev, "Could not allocate urb?\n"); 2373 goto exit; 2374 } 2375 serial->tx_urb->transfer_buffer = NULL; 2376 serial->tx_urb->transfer_buffer_length = 0; 2377 /* prepare our TX buffer */ 2378 serial->tx_data_count = 0; 2379 serial->tx_buffer_count = 0; 2380 serial->tx_data_length = tx_size; 2381 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL); 2382 if (!serial->tx_data) { 2383 dev_err(dev, "%s - Out of memory\n", __func__); 2384 goto exit; 2385 } 2386 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL); 2387 if (!serial->tx_buffer) { 2388 dev_err(dev, "%s - Out of memory\n", __func__); 2389 goto exit; 2390 } 2391 2392 return 0; 2393exit: 2394 hso_serial_common_free(serial); 2395 return -1; 2396} 2397 2398/* Creates a general hso device */ 2399static struct hso_device *hso_create_device(struct usb_interface *intf, 2400 int port_spec) 2401{ 2402 struct hso_device *hso_dev; 2403 2404 hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC); 2405 if (!hso_dev) 2406 return NULL; 2407 2408 hso_dev->port_spec = port_spec; 2409 hso_dev->usb = interface_to_usbdev(intf); 2410 hso_dev->interface = intf; 2411 kref_init(&hso_dev->ref); 2412 mutex_init(&hso_dev->mutex); 2413 2414 INIT_WORK(&hso_dev->async_get_intf, async_get_intf); 2415 INIT_WORK(&hso_dev->async_put_intf, async_put_intf); 2416 INIT_WORK(&hso_dev->reset_device, reset_device); 2417 2418 return hso_dev; 2419} 2420 2421/* Removes a network device in the network device table */ 2422static int remove_net_device(struct hso_device *hso_dev) 2423{ 2424 int i; 2425 2426 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) { 2427 if (network_table[i] == hso_dev) { 2428 network_table[i] = NULL; 2429 break; 2430 } 2431 } 2432 if (i == HSO_MAX_NET_DEVICES) 2433 return -1; 2434 return 0; 2435} 2436 2437/* Frees our network device */ 2438static void hso_free_net_device(struct hso_device *hso_dev) 2439{ 2440 int i; 2441 struct hso_net *hso_net = dev2net(hso_dev); 2442 2443 if (!hso_net) 2444 return; 2445 2446 remove_net_device(hso_net->parent); 2447 2448 if (hso_net->net) { 2449 unregister_netdev(hso_net->net); 2450 free_netdev(hso_net->net); 2451 } 2452 2453 /* start freeing */ 2454 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) { 2455 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]); 2456 kfree(hso_net->mux_bulk_rx_buf_pool[i]); 2457 hso_net->mux_bulk_rx_buf_pool[i] = NULL; 2458 } 2459 usb_free_urb(hso_net->mux_bulk_tx_urb); 2460 kfree(hso_net->mux_bulk_tx_buf); 2461 hso_net->mux_bulk_tx_buf = NULL; 2462 2463 kfree(hso_dev); 2464} 2465 2466static const struct net_device_ops hso_netdev_ops = { 2467 .ndo_open = hso_net_open, 2468 .ndo_stop = hso_net_close, 2469 .ndo_start_xmit = hso_net_start_xmit, 2470 .ndo_tx_timeout = hso_net_tx_timeout, 2471}; 2472 2473/* initialize the network interface */ 2474static void hso_net_init(struct net_device *net) 2475{ 2476 struct hso_net *hso_net = netdev_priv(net); 2477 2478 D1("sizeof hso_net is %d", (int)sizeof(*hso_net)); 2479 2480 /* fill in the other fields */ 2481 net->netdev_ops = &hso_netdev_ops; 2482 net->watchdog_timeo = HSO_NET_TX_TIMEOUT; 2483 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 2484 net->type = ARPHRD_NONE; 2485 net->mtu = DEFAULT_MTU - 14; 2486 net->tx_queue_len = 10; 2487 SET_ETHTOOL_OPS(net, &ops); 2488 2489 /* and initialize the semaphore */ 2490 spin_lock_init(&hso_net->net_lock); 2491} 2492 2493/* Adds a network device in the network device table */ 2494static int add_net_device(struct hso_device *hso_dev) 2495{ 2496 int i; 2497 2498 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) { 2499 if (network_table[i] == NULL) { 2500 network_table[i] = hso_dev; 2501 break; 2502 } 2503 } 2504 if (i == HSO_MAX_NET_DEVICES) 2505 return -1; 2506 return 0; 2507} 2508 2509static int hso_rfkill_set_block(void *data, bool blocked) 2510{ 2511 struct hso_device *hso_dev = data; 2512 int enabled = !blocked; 2513 int rv; 2514 2515 mutex_lock(&hso_dev->mutex); 2516 if (hso_dev->usb_gone) 2517 rv = 0; 2518 else 2519 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0), 2520 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0, 2521 USB_CTRL_SET_TIMEOUT); 2522 mutex_unlock(&hso_dev->mutex); 2523 return rv; 2524} 2525 2526static const struct rfkill_ops hso_rfkill_ops = { 2527 .set_block = hso_rfkill_set_block, 2528}; 2529 2530/* Creates and sets up everything for rfkill */ 2531static void hso_create_rfkill(struct hso_device *hso_dev, 2532 struct usb_interface *interface) 2533{ 2534 struct hso_net *hso_net = dev2net(hso_dev); 2535 struct device *dev = &hso_net->net->dev; 2536 char *rfkn; 2537 2538 rfkn = kzalloc(20, GFP_KERNEL); 2539 if (!rfkn) 2540 dev_err(dev, "%s - Out of memory\n", __func__); 2541 2542 snprintf(rfkn, 20, "hso-%d", 2543 interface->altsetting->desc.bInterfaceNumber); 2544 2545 hso_net->rfkill = rfkill_alloc(rfkn, 2546 &interface_to_usbdev(interface)->dev, 2547 RFKILL_TYPE_WWAN, 2548 &hso_rfkill_ops, hso_dev); 2549 if (!hso_net->rfkill) { 2550 dev_err(dev, "%s - Out of memory\n", __func__); 2551 kfree(rfkn); 2552 return; 2553 } 2554 if (rfkill_register(hso_net->rfkill) < 0) { 2555 rfkill_destroy(hso_net->rfkill); 2556 kfree(rfkn); 2557 hso_net->rfkill = NULL; 2558 dev_err(dev, "%s - Failed to register rfkill\n", __func__); 2559 return; 2560 } 2561} 2562 2563static struct device_type hso_type = { 2564 .name = "wwan", 2565}; 2566 2567/* Creates our network device */ 2568static struct hso_device *hso_create_net_device(struct usb_interface *interface, 2569 int port_spec) 2570{ 2571 int result, i; 2572 struct net_device *net; 2573 struct hso_net *hso_net; 2574 struct hso_device *hso_dev; 2575 2576 hso_dev = hso_create_device(interface, port_spec); 2577 if (!hso_dev) 2578 return NULL; 2579 2580 /* allocate our network device, then we can put in our private data */ 2581 /* call hso_net_init to do the basic initialization */ 2582 net = alloc_netdev(sizeof(struct hso_net), "hso%d", hso_net_init); 2583 if (!net) { 2584 dev_err(&interface->dev, "Unable to create ethernet device\n"); 2585 goto exit; 2586 } 2587 2588 hso_net = netdev_priv(net); 2589 2590 hso_dev->port_data.dev_net = hso_net; 2591 hso_net->net = net; 2592 hso_net->parent = hso_dev; 2593 2594 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, 2595 USB_DIR_IN); 2596 if (!hso_net->in_endp) { 2597 dev_err(&interface->dev, "Can't find BULK IN endpoint\n"); 2598 goto exit; 2599 } 2600 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, 2601 USB_DIR_OUT); 2602 if (!hso_net->out_endp) { 2603 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n"); 2604 goto exit; 2605 } 2606 SET_NETDEV_DEV(net, &interface->dev); 2607 SET_NETDEV_DEVTYPE(net, &hso_type); 2608 2609 /* registering our net device */ 2610 result = register_netdev(net); 2611 if (result) { 2612 dev_err(&interface->dev, "Failed to register device\n"); 2613 goto exit; 2614 } 2615 2616 /* start allocating */ 2617 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) { 2618 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL); 2619 if (!hso_net->mux_bulk_rx_urb_pool[i]) { 2620 dev_err(&interface->dev, "Could not allocate rx urb\n"); 2621 goto exit; 2622 } 2623 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE, 2624 GFP_KERNEL); 2625 if (!hso_net->mux_bulk_rx_buf_pool[i]) { 2626 dev_err(&interface->dev, "Could not allocate rx buf\n"); 2627 goto exit; 2628 } 2629 } 2630 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL); 2631 if (!hso_net->mux_bulk_tx_urb) { 2632 dev_err(&interface->dev, "Could not allocate tx urb\n"); 2633 goto exit; 2634 } 2635 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL); 2636 if (!hso_net->mux_bulk_tx_buf) { 2637 dev_err(&interface->dev, "Could not allocate tx buf\n"); 2638 goto exit; 2639 } 2640 2641 add_net_device(hso_dev); 2642 2643 hso_log_port(hso_dev); 2644 2645 hso_create_rfkill(hso_dev, interface); 2646 2647 return hso_dev; 2648exit: 2649 hso_free_net_device(hso_dev); 2650 return NULL; 2651} 2652 2653static void hso_free_tiomget(struct hso_serial *serial) 2654{ 2655 struct hso_tiocmget *tiocmget = serial->tiocmget; 2656 if (tiocmget) { 2657 if (tiocmget->urb) { 2658 usb_free_urb(tiocmget->urb); 2659 tiocmget->urb = NULL; 2660 } 2661 serial->tiocmget = NULL; 2662 kfree(tiocmget); 2663 2664 } 2665} 2666 2667/* Frees an AT channel ( goes for both mux and non-mux ) */ 2668static void hso_free_serial_device(struct hso_device *hso_dev) 2669{ 2670 struct hso_serial *serial = dev2ser(hso_dev); 2671 2672 if (!serial) 2673 return; 2674 set_serial_by_index(serial->minor, NULL); 2675 2676 hso_serial_common_free(serial); 2677 2678 if (serial->shared_int) { 2679 mutex_lock(&serial->shared_int->shared_int_lock); 2680 if (--serial->shared_int->ref_count == 0) 2681 hso_free_shared_int(serial->shared_int); 2682 else 2683 mutex_unlock(&serial->shared_int->shared_int_lock); 2684 } 2685 hso_free_tiomget(serial); 2686 kfree(serial); 2687 kfree(hso_dev); 2688} 2689 2690/* Creates a bulk AT channel */ 2691static struct hso_device *hso_create_bulk_serial_device( 2692 struct usb_interface *interface, int port) 2693{ 2694 struct hso_device *hso_dev; 2695 struct hso_serial *serial; 2696 int num_urbs; 2697 struct hso_tiocmget *tiocmget; 2698 2699 hso_dev = hso_create_device(interface, port); 2700 if (!hso_dev) 2701 return NULL; 2702 2703 serial = kzalloc(sizeof(*serial), GFP_KERNEL); 2704 if (!serial) 2705 goto exit; 2706 2707 serial->parent = hso_dev; 2708 hso_dev->port_data.dev_serial = serial; 2709 2710 if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) { 2711 num_urbs = 2; 2712 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget), 2713 GFP_KERNEL); 2714 /* it isn't going to break our heart if serial->tiocmget 2715 * allocation fails don't bother checking this. 2716 */ 2717 if (serial->tiocmget) { 2718 tiocmget = serial->tiocmget; 2719 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL); 2720 if (tiocmget->urb) { 2721 mutex_init(&tiocmget->mutex); 2722 init_waitqueue_head(&tiocmget->waitq); 2723 tiocmget->endp = hso_get_ep( 2724 interface, 2725 USB_ENDPOINT_XFER_INT, 2726 USB_DIR_IN); 2727 } else 2728 hso_free_tiomget(serial); 2729 } 2730 } 2731 else 2732 num_urbs = 1; 2733 2734 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE, 2735 BULK_URB_TX_SIZE)) 2736 goto exit; 2737 2738 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, 2739 USB_DIR_IN); 2740 if (!serial->in_endp) { 2741 dev_err(&interface->dev, "Failed to find BULK IN ep\n"); 2742 goto exit2; 2743 } 2744 2745 if (! 2746 (serial->out_endp = 2747 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) { 2748 dev_err(&interface->dev, "Failed to find BULK IN ep\n"); 2749 goto exit2; 2750 } 2751 2752 serial->write_data = hso_std_serial_write_data; 2753 2754 /* and record this serial */ 2755 set_serial_by_index(serial->minor, serial); 2756 2757 /* setup the proc dirs and files if needed */ 2758 hso_log_port(hso_dev); 2759 2760 /* done, return it */ 2761 return hso_dev; 2762 2763exit2: 2764 hso_serial_common_free(serial); 2765exit: 2766 hso_free_tiomget(serial); 2767 kfree(serial); 2768 kfree(hso_dev); 2769 return NULL; 2770} 2771 2772/* Creates a multiplexed AT channel */ 2773static 2774struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface, 2775 int port, 2776 struct hso_shared_int *mux) 2777{ 2778 struct hso_device *hso_dev; 2779 struct hso_serial *serial; 2780 int port_spec; 2781 2782 port_spec = HSO_INTF_MUX; 2783 port_spec &= ~HSO_PORT_MASK; 2784 2785 port_spec |= hso_mux_to_port(port); 2786 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT) 2787 return NULL; 2788 2789 hso_dev = hso_create_device(interface, port_spec); 2790 if (!hso_dev) 2791 return NULL; 2792 2793 serial = kzalloc(sizeof(*serial), GFP_KERNEL); 2794 if (!serial) 2795 goto exit; 2796 2797 hso_dev->port_data.dev_serial = serial; 2798 serial->parent = hso_dev; 2799 2800 if (hso_serial_common_create 2801 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE)) 2802 goto exit; 2803 2804 serial->tx_data_length--; 2805 serial->write_data = hso_mux_serial_write_data; 2806 2807 serial->shared_int = mux; 2808 mutex_lock(&serial->shared_int->shared_int_lock); 2809 serial->shared_int->ref_count++; 2810 mutex_unlock(&serial->shared_int->shared_int_lock); 2811 2812 /* and record this serial */ 2813 set_serial_by_index(serial->minor, serial); 2814 2815 /* setup the proc dirs and files if needed */ 2816 hso_log_port(hso_dev); 2817 2818 /* done, return it */ 2819 return hso_dev; 2820 2821exit: 2822 if (serial) { 2823 tty_unregister_device(tty_drv, serial->minor); 2824 kfree(serial); 2825 } 2826 if (hso_dev) 2827 kfree(hso_dev); 2828 return NULL; 2829 2830} 2831 2832static void hso_free_shared_int(struct hso_shared_int *mux) 2833{ 2834 usb_free_urb(mux->shared_intr_urb); 2835 kfree(mux->shared_intr_buf); 2836 mutex_unlock(&mux->shared_int_lock); 2837 kfree(mux); 2838} 2839 2840static 2841struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface) 2842{ 2843 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL); 2844 2845 if (!mux) 2846 return NULL; 2847 2848 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT, 2849 USB_DIR_IN); 2850 if (!mux->intr_endp) { 2851 dev_err(&interface->dev, "Can't find INT IN endpoint\n"); 2852 goto exit; 2853 } 2854 2855 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL); 2856 if (!mux->shared_intr_urb) { 2857 dev_err(&interface->dev, "Could not allocate intr urb?\n"); 2858 goto exit; 2859 } 2860 mux->shared_intr_buf = 2861 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize), 2862 GFP_KERNEL); 2863 if (!mux->shared_intr_buf) { 2864 dev_err(&interface->dev, "Could not allocate intr buf?\n"); 2865 goto exit; 2866 } 2867 2868 mutex_init(&mux->shared_int_lock); 2869 2870 return mux; 2871 2872exit: 2873 kfree(mux->shared_intr_buf); 2874 usb_free_urb(mux->shared_intr_urb); 2875 kfree(mux); 2876 return NULL; 2877} 2878 2879/* Gets the port spec for a certain interface */ 2880static int hso_get_config_data(struct usb_interface *interface) 2881{ 2882 struct usb_device *usbdev = interface_to_usbdev(interface); 2883 u8 config_data[17]; 2884 u32 if_num = interface->altsetting->desc.bInterfaceNumber; 2885 s32 result; 2886 2887 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 2888 0x86, 0xC0, 0, 0, config_data, 17, 2889 USB_CTRL_SET_TIMEOUT) != 0x11) { 2890 return -EIO; 2891 } 2892 2893 switch (config_data[if_num]) { 2894 case 0x0: 2895 result = 0; 2896 break; 2897 case 0x1: 2898 result = HSO_PORT_DIAG; 2899 break; 2900 case 0x2: 2901 result = HSO_PORT_GPS; 2902 break; 2903 case 0x3: 2904 result = HSO_PORT_GPS_CONTROL; 2905 break; 2906 case 0x4: 2907 result = HSO_PORT_APP; 2908 break; 2909 case 0x5: 2910 result = HSO_PORT_APP2; 2911 break; 2912 case 0x6: 2913 result = HSO_PORT_CONTROL; 2914 break; 2915 case 0x7: 2916 result = HSO_PORT_NETWORK; 2917 break; 2918 case 0x8: 2919 result = HSO_PORT_MODEM; 2920 break; 2921 case 0x9: 2922 result = HSO_PORT_MSD; 2923 break; 2924 case 0xa: 2925 result = HSO_PORT_PCSC; 2926 break; 2927 case 0xb: 2928 result = HSO_PORT_VOICE; 2929 break; 2930 default: 2931 result = 0; 2932 } 2933 2934 if (result) 2935 result |= HSO_INTF_BULK; 2936 2937 if (config_data[16] & 0x1) 2938 result |= HSO_INFO_CRC_BUG; 2939 2940 return result; 2941} 2942 2943/* called once for each interface upon device insertion */ 2944static int hso_probe(struct usb_interface *interface, 2945 const struct usb_device_id *id) 2946{ 2947 int mux, i, if_num, port_spec; 2948 unsigned char port_mask; 2949 struct hso_device *hso_dev = NULL; 2950 struct hso_shared_int *shared_int; 2951 struct hso_device *tmp_dev = NULL; 2952 2953 if_num = interface->altsetting->desc.bInterfaceNumber; 2954 2955 /* Get the interface/port specification from either driver_info or from 2956 * the device itself */ 2957 if (id->driver_info) 2958 port_spec = ((u32 *)(id->driver_info))[if_num]; 2959 else 2960 port_spec = hso_get_config_data(interface); 2961 2962 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) { 2963 dev_err(&interface->dev, "Not our interface\n"); 2964 return -ENODEV; 2965 } 2966 /* Check if we need to switch to alt interfaces prior to port 2967 * configuration */ 2968 if (interface->num_altsetting > 1) 2969 usb_set_interface(interface_to_usbdev(interface), if_num, 1); 2970 interface->needs_remote_wakeup = 1; 2971 2972 /* Allocate new hso device(s) */ 2973 switch (port_spec & HSO_INTF_MASK) { 2974 case HSO_INTF_MUX: 2975 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) { 2976 /* Create the network device */ 2977 if (!disable_net) { 2978 hso_dev = hso_create_net_device(interface, 2979 port_spec); 2980 if (!hso_dev) 2981 goto exit; 2982 tmp_dev = hso_dev; 2983 } 2984 } 2985 2986 if (hso_get_mux_ports(interface, &port_mask)) 2987 /* TODO: de-allocate everything */ 2988 goto exit; 2989 2990 shared_int = hso_create_shared_int(interface); 2991 if (!shared_int) 2992 goto exit; 2993 2994 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) { 2995 if (port_mask & i) { 2996 hso_dev = hso_create_mux_serial_device( 2997 interface, i, shared_int); 2998 if (!hso_dev) 2999 goto exit; 3000 } 3001 } 3002 3003 if (tmp_dev) 3004 hso_dev = tmp_dev; 3005 break; 3006 3007 case HSO_INTF_BULK: 3008 /* It's a regular bulk interface */ 3009 if (((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) && 3010 !disable_net) 3011 hso_dev = hso_create_net_device(interface, port_spec); 3012 else 3013 hso_dev = 3014 hso_create_bulk_serial_device(interface, port_spec); 3015 if (!hso_dev) 3016 goto exit; 3017 break; 3018 default: 3019 goto exit; 3020 } 3021 3022 /* save our data pointer in this device */ 3023 usb_set_intfdata(interface, hso_dev); 3024 3025 /* done */ 3026 return 0; 3027exit: 3028 hso_free_interface(interface); 3029 return -ENODEV; 3030} 3031 3032/* device removed, cleaning up */ 3033static void hso_disconnect(struct usb_interface *interface) 3034{ 3035 hso_free_interface(interface); 3036 3037 /* remove reference of our private data */ 3038 usb_set_intfdata(interface, NULL); 3039} 3040 3041static void async_get_intf(struct work_struct *data) 3042{ 3043 struct hso_device *hso_dev = 3044 container_of(data, struct hso_device, async_get_intf); 3045 usb_autopm_get_interface(hso_dev->interface); 3046} 3047 3048static void async_put_intf(struct work_struct *data) 3049{ 3050 struct hso_device *hso_dev = 3051 container_of(data, struct hso_device, async_put_intf); 3052 usb_autopm_put_interface(hso_dev->interface); 3053} 3054 3055static int hso_get_activity(struct hso_device *hso_dev) 3056{ 3057 if (hso_dev->usb->state == USB_STATE_SUSPENDED) { 3058 if (!hso_dev->is_active) { 3059 hso_dev->is_active = 1; 3060 schedule_work(&hso_dev->async_get_intf); 3061 } 3062 } 3063 3064 if (hso_dev->usb->state != USB_STATE_CONFIGURED) 3065 return -EAGAIN; 3066 3067 usb_mark_last_busy(hso_dev->usb); 3068 3069 return 0; 3070} 3071 3072static int hso_put_activity(struct hso_device *hso_dev) 3073{ 3074 if (hso_dev->usb->state != USB_STATE_SUSPENDED) { 3075 if (hso_dev->is_active) { 3076 hso_dev->is_active = 0; 3077 schedule_work(&hso_dev->async_put_intf); 3078 return -EAGAIN; 3079 } 3080 } 3081 hso_dev->is_active = 0; 3082 return 0; 3083} 3084 3085/* called by kernel when we need to suspend device */ 3086static int hso_suspend(struct usb_interface *iface, pm_message_t message) 3087{ 3088 int i, result; 3089 3090 /* Stop all serial ports */ 3091 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) { 3092 if (serial_table[i] && (serial_table[i]->interface == iface)) { 3093 result = hso_stop_serial_device(serial_table[i]); 3094 if (result) 3095 goto out; 3096 } 3097 } 3098 3099 /* Stop all network ports */ 3100 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) { 3101 if (network_table[i] && 3102 (network_table[i]->interface == iface)) { 3103 result = hso_stop_net_device(network_table[i]); 3104 if (result) 3105 goto out; 3106 } 3107 } 3108 3109out: 3110 return 0; 3111} 3112 3113/* called by kernel when we need to resume device */ 3114static int hso_resume(struct usb_interface *iface) 3115{ 3116 int i, result = 0; 3117 struct hso_net *hso_net; 3118 3119 /* Start all serial ports */ 3120 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) { 3121 if (serial_table[i] && (serial_table[i]->interface == iface)) { 3122 if (dev2ser(serial_table[i])->open_count) { 3123 result = 3124 hso_start_serial_device(serial_table[i], GFP_NOIO); 3125 hso_kick_transmit(dev2ser(serial_table[i])); 3126 if (result) 3127 goto out; 3128 } 3129 } 3130 } 3131 3132 /* Start all network ports */ 3133 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) { 3134 if (network_table[i] && 3135 (network_table[i]->interface == iface)) { 3136 hso_net = dev2net(network_table[i]); 3137 if (hso_net->flags & IFF_UP) { 3138 /* First transmit any lingering data, 3139 then restart the device. */ 3140 if (hso_net->skb_tx_buf) { 3141 dev_dbg(&iface->dev, 3142 "Transmitting" 3143 " lingering data\n"); 3144 hso_net_start_xmit(hso_net->skb_tx_buf, 3145 hso_net->net); 3146 hso_net->skb_tx_buf = NULL; 3147 } 3148 result = hso_start_net_device(network_table[i]); 3149 if (result) 3150 goto out; 3151 } 3152 } 3153 } 3154 3155out: 3156 return result; 3157} 3158 3159static void reset_device(struct work_struct *data) 3160{ 3161 struct hso_device *hso_dev = 3162 container_of(data, struct hso_device, reset_device); 3163 struct usb_device *usb = hso_dev->usb; 3164 int result; 3165 3166 if (hso_dev->usb_gone) { 3167 D1("No reset during disconnect\n"); 3168 } else { 3169 result = usb_lock_device_for_reset(usb, hso_dev->interface); 3170 if (result < 0) 3171 D1("unable to lock device for reset: %d\n", result); 3172 else { 3173 usb_reset_device(usb); 3174 usb_unlock_device(usb); 3175 } 3176 } 3177} 3178 3179static void hso_serial_ref_free(struct kref *ref) 3180{ 3181 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref); 3182 3183 hso_free_serial_device(hso_dev); 3184} 3185 3186static void hso_free_interface(struct usb_interface *interface) 3187{ 3188 struct hso_serial *hso_dev; 3189 struct tty_struct *tty; 3190 int i; 3191 3192 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) { 3193 if (serial_table[i] && 3194 (serial_table[i]->interface == interface)) { 3195 hso_dev = dev2ser(serial_table[i]); 3196 spin_lock_irq(&hso_dev->serial_lock); 3197 tty = tty_kref_get(hso_dev->tty); 3198 spin_unlock_irq(&hso_dev->serial_lock); 3199 if (tty) 3200 tty_hangup(tty); 3201 mutex_lock(&hso_dev->parent->mutex); 3202 tty_kref_put(tty); 3203 hso_dev->parent->usb_gone = 1; 3204 mutex_unlock(&hso_dev->parent->mutex); 3205 kref_put(&serial_table[i]->ref, hso_serial_ref_free); 3206 } 3207 } 3208 3209 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) { 3210 if (network_table[i] && 3211 (network_table[i]->interface == interface)) { 3212 struct rfkill *rfk = dev2net(network_table[i])->rfkill; 3213 /* hso_stop_net_device doesn't stop the net queue since 3214 * traffic needs to start it again when suspended */ 3215 netif_stop_queue(dev2net(network_table[i])->net); 3216 hso_stop_net_device(network_table[i]); 3217 cancel_work_sync(&network_table[i]->async_put_intf); 3218 cancel_work_sync(&network_table[i]->async_get_intf); 3219 if (rfk) { 3220 rfkill_unregister(rfk); 3221 rfkill_destroy(rfk); 3222 } 3223 hso_free_net_device(network_table[i]); 3224 } 3225 } 3226} 3227 3228/* Helper functions */ 3229 3230/* Get the endpoint ! */ 3231static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf, 3232 int type, int dir) 3233{ 3234 int i; 3235 struct usb_host_interface *iface = intf->cur_altsetting; 3236 struct usb_endpoint_descriptor *endp; 3237 3238 for (i = 0; i < iface->desc.bNumEndpoints; i++) { 3239 endp = &iface->endpoint[i].desc; 3240 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) && 3241 (usb_endpoint_type(endp) == type)) 3242 return endp; 3243 } 3244 3245 return NULL; 3246} 3247 3248/* Get the byte that describes which ports are enabled */ 3249static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports) 3250{ 3251 int i; 3252 struct usb_host_interface *iface = intf->cur_altsetting; 3253 3254 if (iface->extralen == 3) { 3255 *ports = iface->extra[2]; 3256 return 0; 3257 } 3258 3259 for (i = 0; i < iface->desc.bNumEndpoints; i++) { 3260 if (iface->endpoint[i].extralen == 3) { 3261 *ports = iface->endpoint[i].extra[2]; 3262 return 0; 3263 } 3264 } 3265 3266 return -1; 3267} 3268 3269/* interrupt urb needs to be submitted, used for serial read of muxed port */ 3270static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int, 3271 struct usb_device *usb, gfp_t gfp) 3272{ 3273 int result; 3274 3275 usb_fill_int_urb(shared_int->shared_intr_urb, usb, 3276 usb_rcvintpipe(usb, 3277 shared_int->intr_endp->bEndpointAddress & 0x7F), 3278 shared_int->shared_intr_buf, 3279 1, 3280 intr_callback, shared_int, 3281 shared_int->intr_endp->bInterval); 3282 3283 result = usb_submit_urb(shared_int->shared_intr_urb, gfp); 3284 if (result) 3285 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__, 3286 result); 3287 3288 return result; 3289} 3290 3291/* operations setup of the serial interface */ 3292static const struct tty_operations hso_serial_ops = { 3293 .open = hso_serial_open, 3294 .close = hso_serial_close, 3295 .write = hso_serial_write, 3296 .write_room = hso_serial_write_room, 3297 .ioctl = hso_serial_ioctl, 3298 .set_termios = hso_serial_set_termios, 3299 .chars_in_buffer = hso_serial_chars_in_buffer, 3300 .tiocmget = hso_serial_tiocmget, 3301 .tiocmset = hso_serial_tiocmset, 3302 .unthrottle = hso_unthrottle 3303}; 3304 3305static struct usb_driver hso_driver = { 3306 .name = driver_name, 3307 .probe = hso_probe, 3308 .disconnect = hso_disconnect, 3309 .id_table = hso_ids, 3310 .suspend = hso_suspend, 3311 .resume = hso_resume, 3312 .reset_resume = hso_resume, 3313 .supports_autosuspend = 1, 3314}; 3315 3316static int __init hso_init(void) 3317{ 3318 int i; 3319 int result; 3320 3321 /* put it in the log */ 3322 printk(KERN_INFO "hso: %s\n", version); 3323 3324 /* Initialise the serial table semaphore and table */ 3325 spin_lock_init(&serial_table_lock); 3326 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) 3327 serial_table[i] = NULL; 3328 3329 /* allocate our driver using the proper amount of supported minors */ 3330 tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS); 3331 if (!tty_drv) 3332 return -ENOMEM; 3333 3334 /* fill in all needed values */ 3335 tty_drv->magic = TTY_DRIVER_MAGIC; 3336 tty_drv->owner = THIS_MODULE; 3337 tty_drv->driver_name = driver_name; 3338 tty_drv->name = tty_filename; 3339 3340 /* if major number is provided as parameter, use that one */ 3341 if (tty_major) 3342 tty_drv->major = tty_major; 3343 3344 tty_drv->minor_start = 0; 3345 tty_drv->num = HSO_SERIAL_TTY_MINORS; 3346 tty_drv->type = TTY_DRIVER_TYPE_SERIAL; 3347 tty_drv->subtype = SERIAL_TYPE_NORMAL; 3348 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 3349 tty_drv->init_termios = tty_std_termios; 3350 hso_init_termios(&tty_drv->init_termios); 3351 tty_set_operations(tty_drv, &hso_serial_ops); 3352 3353 /* register the tty driver */ 3354 result = tty_register_driver(tty_drv); 3355 if (result) { 3356 printk(KERN_ERR "%s - tty_register_driver failed(%d)\n", 3357 __func__, result); 3358 return result; 3359 } 3360 3361 /* register this module as an usb driver */ 3362 result = usb_register(&hso_driver); 3363 if (result) { 3364 printk(KERN_ERR "Could not register hso driver? error: %d\n", 3365 result); 3366 /* cleanup serial interface */ 3367 tty_unregister_driver(tty_drv); 3368 return result; 3369 } 3370 3371 /* done */ 3372 return 0; 3373} 3374 3375static void __exit hso_exit(void) 3376{ 3377 printk(KERN_INFO "hso: unloaded\n"); 3378 3379 tty_unregister_driver(tty_drv); 3380 /* deregister the usb driver */ 3381 usb_deregister(&hso_driver); 3382} 3383 3384/* Module definitions */ 3385module_init(hso_init); 3386module_exit(hso_exit); 3387 3388MODULE_AUTHOR(MOD_AUTHOR); 3389MODULE_DESCRIPTION(MOD_DESCRIPTION); 3390MODULE_LICENSE(MOD_LICENSE); 3391MODULE_INFO(Version, DRIVER_VERSION); 3392 3393/* change the debug level (eg: insmod hso.ko debug=0x04) */ 3394MODULE_PARM_DESC(debug, "Level of debug [0x01 | 0x02 | 0x04 | 0x08 | 0x10]"); 3395module_param(debug, int, S_IRUGO | S_IWUSR); 3396 3397/* set the major tty number (eg: insmod hso.ko tty_major=245) */ 3398MODULE_PARM_DESC(tty_major, "Set the major tty number"); 3399module_param(tty_major, int, S_IRUGO | S_IWUSR); 3400 3401/* disable network interface (eg: insmod hso.ko disable_net=1) */ 3402MODULE_PARM_DESC(disable_net, "Disable the network interface"); 3403module_param(disable_net, int, S_IRUGO | S_IWUSR); 3404