1/* 2* Digi AccelePort USB-4 and USB-2 Serial Converters 3* 4* Copyright 2000 by Digi International 5* 6* This program is free software; you can redistribute it and/or modify 7* it under the terms of the GNU General Public License as published by 8* the Free Software Foundation; either version 2 of the License, or 9* (at your option) any later version. 10* 11* Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's 12* usb-serial driver. 13* 14* Peter Berger (pberger@brimson.com) 15* Al Borchers (borchers@steinerpoint.com) 16* 17* (12/03/2001) gkh 18* switched to using port->port.count instead of private version. 19* Removed port->active 20* 21* (04/08/2001) gb 22* Identify version on module load. 23* 24* (11/01/2000) Adam J. Richter 25* usb_device_id table support 26* 27* (11/01/2000) pberger and borchers 28* -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused 29* USB 4 ports to hang on startup. 30* -- Serialized access to write urbs by adding the dp_write_urb_in_use 31* flag; otherwise, the driver caused SMP system hangs. Watching the 32* urb status is not sufficient. 33* 34* (10/05/2000) gkh 35* -- Fixed bug with urb->dev not being set properly, now that the usb 36* core needs it. 37* 38* (8/8/2000) pberger and borchers 39* -- Fixed close so that 40* - it can timeout while waiting for transmit idle, if needed; 41* - it ignores interrupts when flushing the port, turning 42* of modem signalling, and so on; 43* - it waits for the flush to really complete before returning. 44* -- Read_bulk_callback and write_bulk_callback check for a closed 45* port before using the tty struct or writing to the port. 46* -- The two changes above fix the oops caused by interrupted closes. 47* -- Added interruptible args to write_oob_command and set_modem_signals 48* and added a timeout arg to transmit_idle; needed for fixes to 49* close. 50* -- Added code for rx_throttle and rx_unthrottle so that input flow 51* control works. 52* -- Added code to set overrun, parity, framing, and break errors 53* (untested). 54* -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length 55* bulk writes are done. These hung the Digi USB device. The 56* 0 length bulk writes were a new feature of usb-uhci added in 57* the 2.4.0-test6 kernels. 58* -- Fixed mod inc race in open; do mod inc before sleeping to wait 59* for a close to finish. 60* 61* (7/31/2000) pberger 62* -- Fixed bugs with hardware handshaking: 63* - Added code to set/clear tty->hw_stopped in digi_read_oob_callback() 64* and digi_set_termios() 65* -- Added code in digi_set_termios() to 66* - add conditional in code handling transition from B0 to only 67* set RTS if RTS/CTS flow control is either not in use or if 68* the port is not currently throttled. 69* - handle turning off CRTSCTS. 70* 71* (7/30/2000) borchers 72* -- Added support for more than one Digi USB device by moving 73* globals to a private structure in the pointed to from the 74* usb_serial structure. 75* -- Moved the modem change and transmit idle wait queues into 76* the port private structure, so each port has its own queue 77* rather than sharing global queues. 78* -- Added support for break signals. 79* 80* (7/25/2000) pberger 81* -- Added USB-2 support. Note: the USB-2 supports 3 devices: two 82* serial and a parallel port. The parallel port is implemented 83* as a serial-to-parallel converter. That is, the driver actually 84* presents all three USB-2 interfaces as serial ports, but the third 85* one physically connects to a parallel device. Thus, for example, 86* one could plug a parallel printer into the USB-2's third port, 87* but from the kernel's (and userland's) point of view what's 88* actually out there is a serial device. 89* 90* (7/15/2000) borchers 91* -- Fixed race in open when a close is in progress. 92* -- Keep count of opens and dec the module use count for each 93* outstanding open when shutdown is called (on disconnect). 94* -- Fixed sanity checks in read_bulk_callback and write_bulk_callback 95* so pointers are checked before use. 96* -- Split read bulk callback into in band and out of band 97* callbacks, and no longer restart read chains if there is 98* a status error or a sanity error. This fixed the seg 99* faults and other errors we used to get on disconnect. 100* -- Port->active is once again a flag as usb-serial intended it 101* to be, not a count. Since it was only a char it would 102* have been limited to 256 simultaneous opens. Now the open 103* count is kept in the port private structure in dp_open_count. 104* -- Added code for modularization of the digi_acceleport driver. 105* 106* (6/27/2000) pberger and borchers 107* -- Zeroed out sync field in the wakeup_task before first use; 108* otherwise the uninitialized value might prevent the task from 109* being scheduled. 110* -- Initialized ret value to 0 in write_bulk_callback, otherwise 111* the uninitialized value could cause a spurious debugging message. 112* 113* (6/22/2000) pberger and borchers 114* -- Made cond_wait_... inline--apparently on SPARC the flags arg 115* to spin_lock_irqsave cannot be passed to another function 116* to call spin_unlock_irqrestore. Thanks to Pauline Middelink. 117* -- In digi_set_modem_signals the inner nested spin locks use just 118* spin_lock() rather than spin_lock_irqsave(). The old code 119* mistakenly left interrupts off. Thanks to Pauline Middelink. 120* -- copy_from_user (which can sleep) is no longer called while a 121* spinlock is held. We copy to a local buffer before getting 122* the spinlock--don't like the extra copy but the code is simpler. 123* -- Printk and dbg are no longer called while a spin lock is held. 124* 125* (6/4/2000) pberger and borchers 126* -- Replaced separate calls to spin_unlock_irqrestore and 127* interruptible_sleep_on_timeout with a new function 128* cond_wait_interruptible_timeout_irqrestore. This eliminates 129* the race condition where the wake up could happen after 130* the unlock and before the sleep. 131* -- Close now waits for output to drain. 132* -- Open waits until any close in progress is finished. 133* -- All out of band responses are now processed, not just the 134* first in a USB packet. 135* -- Fixed a bug that prevented the driver from working when the 136* first Digi port was not the first USB serial port--the driver 137* was mistakenly using the external USB serial port number to 138* try to index into its internal ports. 139* -- Fixed an SMP bug -- write_bulk_callback is called directly from 140* an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are 141* needed for locks outside write_bulk_callback that are also 142* acquired by write_bulk_callback to prevent deadlocks. 143* -- Fixed support for select() by making digi_chars_in_buffer() 144* return 256 when -EINPROGRESS is set, as the line discipline 145* code in n_tty.c expects. 146* -- Fixed an include file ordering problem that prevented debugging 147* messages from working. 148* -- Fixed an intermittent timeout problem that caused writes to 149* sometimes get stuck on some machines on some kernels. It turns 150* out in these circumstances write_chan() (in n_tty.c) was 151* asleep waiting for our wakeup call. Even though we call 152* wake_up_interruptible() in digi_write_bulk_callback(), there is 153* a race condition that could cause the wakeup to fail: if our 154* wake_up_interruptible() call occurs between the time that our 155* driver write routine finishes and write_chan() sets current->state 156* to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state 157* to TASK_RUNNING will be lost and write_chan's subsequent call to 158* schedule() will never return (unless it catches a signal). 159* This race condition occurs because write_bulk_callback() (and thus 160* the wakeup) are called asynchronously from an interrupt, rather than 161* from the scheduler. We can avoid the race by calling the wakeup 162* from the scheduler queue and that's our fix: Now, at the end of 163* write_bulk_callback() we queue up a wakeup call on the scheduler 164* task queue. We still also invoke the wakeup directly since that 165* squeezes a bit more performance out of the driver, and any lost 166* race conditions will get cleaned up at the next scheduler run. 167* 168* NOTE: The problem also goes away if you comment out 169* the two code lines in write_chan() where current->state 170* is set to TASK_RUNNING just before calling driver.write() and to 171* TASK_INTERRUPTIBLE immediately afterwards. This is why the 172* problem did not show up with the 2.2 kernels -- they do not 173* include that code. 174* 175* (5/16/2000) pberger and borchers 176* -- Added timeouts to sleeps, to defend against lost wake ups. 177* -- Handle transition to/from B0 baud rate in digi_set_termios. 178* 179* (5/13/2000) pberger and borchers 180* -- All commands now sent on out of band port, using 181* digi_write_oob_command. 182* -- Get modem control signals whenever they change, support TIOCMGET/ 183* SET/BIS/BIC ioctls. 184* -- digi_set_termios now supports parity, word size, stop bits, and 185* receive enable. 186* -- Cleaned up open and close, use digi_set_termios and 187* digi_write_oob_command to set port parameters. 188* -- Added digi_startup_device to start read chains on all ports. 189* -- Write buffer is only used when count==1, to be sure put_char can 190* write a char (unless the buffer is full). 191* 192* (5/10/2000) pberger and borchers 193* -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close. 194* -- Fixed problem where the first incoming character is lost on 195* port opens after the first close on that port. Now we keep 196* the read_urb chain open until shutdown. 197* -- Added more port conditioning calls in digi_open and digi_close. 198* -- Convert port->active to a use count so that we can deal with multiple 199* opens and closes properly. 200* -- Fixed some problems with the locking code. 201* 202* (5/3/2000) pberger and borchers 203* -- First alpha version of the driver--many known limitations and bugs. 204* 205* 206* Locking and SMP 207* 208* - Each port, including the out-of-band port, has a lock used to 209* serialize all access to the port's private structure. 210* - The port lock is also used to serialize all writes and access to 211* the port's URB. 212* - The port lock is also used for the port write_wait condition 213* variable. Holding the port lock will prevent a wake up on the 214* port's write_wait; this can be used with cond_wait_... to be sure 215* the wake up is not lost in a race when dropping the lock and 216* sleeping waiting for the wakeup. 217* - digi_write() does not sleep, since it is sometimes called on 218* interrupt time. 219* - digi_write_bulk_callback() and digi_read_bulk_callback() are 220* called directly from interrupts. Hence spin_lock_irqsave() 221* and spin_unlock_irqrestore() are used in the rest of the code 222* for any locks they acquire. 223* - digi_write_bulk_callback() gets the port lock before waking up 224* processes sleeping on the port write_wait. It also schedules 225* wake ups so they happen from the scheduler, because the tty 226* system can miss wake ups from interrupts. 227* - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to 228* recheck the condition they are sleeping on. This is defensive, 229* in case a wake up is lost. 230* - Following Documentation/DocBook/kernel-locking.pdf no spin locks 231* are held when calling copy_to/from_user or printk. 232*/ 233 234#include <linux/kernel.h> 235#include <linux/errno.h> 236#include <linux/init.h> 237#include <linux/slab.h> 238#include <linux/tty.h> 239#include <linux/tty_driver.h> 240#include <linux/tty_flip.h> 241#include <linux/module.h> 242#include <linux/spinlock.h> 243#include <linux/workqueue.h> 244#include <linux/uaccess.h> 245#include <linux/usb.h> 246#include <linux/wait.h> 247#include <linux/usb/serial.h> 248 249/* Defines */ 250 251/* 252 * Version Information 253 */ 254#define DRIVER_VERSION "v1.80.1.2" 255#define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 256#define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 257 258/* port output buffer length -- must be <= transfer buffer length - 2 */ 259/* so we can be sure to send the full buffer in one urb */ 260#define DIGI_OUT_BUF_SIZE 8 261 262/* port input buffer length -- must be >= transfer buffer length - 3 */ 263/* so we can be sure to hold at least one full buffer from one urb */ 264#define DIGI_IN_BUF_SIZE 64 265 266/* retry timeout while sleeping */ 267#define DIGI_RETRY_TIMEOUT (HZ/10) 268 269/* timeout while waiting for tty output to drain in close */ 270/* this delay is used twice in close, so the total delay could */ 271/* be twice this value */ 272#define DIGI_CLOSE_TIMEOUT (5*HZ) 273 274 275/* AccelePort USB Defines */ 276 277/* ids */ 278#define DIGI_VENDOR_ID 0x05c5 279#define DIGI_2_ID 0x0002 /* USB-2 */ 280#define DIGI_4_ID 0x0004 /* USB-4 */ 281 282/* commands 283 * "INB": can be used on the in-band endpoint 284 * "OOB": can be used on the out-of-band endpoint 285 */ 286#define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 287#define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 288#define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 289#define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 290#define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 291#define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 292#define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 293#define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 294#define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 295#define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 296#define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 297#define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 298#define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 299#define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 300#define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 301#define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 302#define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 303#define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 304#define DIGI_CMD_SEND_DATA 18 /* INB */ 305#define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 306#define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 307#define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 308 309/* baud rates */ 310#define DIGI_BAUD_50 0 311#define DIGI_BAUD_75 1 312#define DIGI_BAUD_110 2 313#define DIGI_BAUD_150 3 314#define DIGI_BAUD_200 4 315#define DIGI_BAUD_300 5 316#define DIGI_BAUD_600 6 317#define DIGI_BAUD_1200 7 318#define DIGI_BAUD_1800 8 319#define DIGI_BAUD_2400 9 320#define DIGI_BAUD_4800 10 321#define DIGI_BAUD_7200 11 322#define DIGI_BAUD_9600 12 323#define DIGI_BAUD_14400 13 324#define DIGI_BAUD_19200 14 325#define DIGI_BAUD_28800 15 326#define DIGI_BAUD_38400 16 327#define DIGI_BAUD_57600 17 328#define DIGI_BAUD_76800 18 329#define DIGI_BAUD_115200 19 330#define DIGI_BAUD_153600 20 331#define DIGI_BAUD_230400 21 332#define DIGI_BAUD_460800 22 333 334/* arguments */ 335#define DIGI_WORD_SIZE_5 0 336#define DIGI_WORD_SIZE_6 1 337#define DIGI_WORD_SIZE_7 2 338#define DIGI_WORD_SIZE_8 3 339 340#define DIGI_PARITY_NONE 0 341#define DIGI_PARITY_ODD 1 342#define DIGI_PARITY_EVEN 2 343#define DIGI_PARITY_MARK 3 344#define DIGI_PARITY_SPACE 4 345 346#define DIGI_STOP_BITS_1 0 347#define DIGI_STOP_BITS_2 1 348 349#define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 350#define DIGI_INPUT_FLOW_CONTROL_RTS 2 351#define DIGI_INPUT_FLOW_CONTROL_DTR 4 352 353#define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 354#define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 355#define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 356 357#define DIGI_DTR_INACTIVE 0 358#define DIGI_DTR_ACTIVE 1 359#define DIGI_DTR_INPUT_FLOW_CONTROL 2 360 361#define DIGI_RTS_INACTIVE 0 362#define DIGI_RTS_ACTIVE 1 363#define DIGI_RTS_INPUT_FLOW_CONTROL 2 364#define DIGI_RTS_TOGGLE 3 365 366#define DIGI_FLUSH_TX 1 367#define DIGI_FLUSH_RX 2 368#define DIGI_RESUME_TX 4 /* clears xoff condition */ 369 370#define DIGI_TRANSMIT_NOT_IDLE 0 371#define DIGI_TRANSMIT_IDLE 1 372 373#define DIGI_DISABLE 0 374#define DIGI_ENABLE 1 375 376#define DIGI_DEASSERT 0 377#define DIGI_ASSERT 1 378 379/* in band status codes */ 380#define DIGI_OVERRUN_ERROR 4 381#define DIGI_PARITY_ERROR 8 382#define DIGI_FRAMING_ERROR 16 383#define DIGI_BREAK_ERROR 32 384 385/* out of band status */ 386#define DIGI_NO_ERROR 0 387#define DIGI_BAD_FIRST_PARAMETER 1 388#define DIGI_BAD_SECOND_PARAMETER 2 389#define DIGI_INVALID_LINE 3 390#define DIGI_INVALID_OPCODE 4 391 392/* input signals */ 393#define DIGI_READ_INPUT_SIGNALS_SLOT 1 394#define DIGI_READ_INPUT_SIGNALS_ERR 2 395#define DIGI_READ_INPUT_SIGNALS_BUSY 4 396#define DIGI_READ_INPUT_SIGNALS_PE 8 397#define DIGI_READ_INPUT_SIGNALS_CTS 16 398#define DIGI_READ_INPUT_SIGNALS_DSR 32 399#define DIGI_READ_INPUT_SIGNALS_RI 64 400#define DIGI_READ_INPUT_SIGNALS_DCD 128 401 402 403/* Structures */ 404 405struct digi_serial { 406 spinlock_t ds_serial_lock; 407 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 408 int ds_oob_port_num; /* index of out-of-band port */ 409 int ds_device_started; 410}; 411 412struct digi_port { 413 spinlock_t dp_port_lock; 414 int dp_port_num; 415 int dp_out_buf_len; 416 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 417 int dp_write_urb_in_use; 418 unsigned int dp_modem_signals; 419 wait_queue_head_t dp_modem_change_wait; 420 int dp_transmit_idle; 421 wait_queue_head_t dp_transmit_idle_wait; 422 int dp_throttled; 423 int dp_throttle_restart; 424 wait_queue_head_t dp_flush_wait; 425 wait_queue_head_t dp_close_wait; /* wait queue for close */ 426 struct work_struct dp_wakeup_work; 427 struct usb_serial_port *dp_port; 428}; 429 430 431/* Local Function Declarations */ 432 433static void digi_wakeup_write(struct usb_serial_port *port); 434static void digi_wakeup_write_lock(struct work_struct *work); 435static int digi_write_oob_command(struct usb_serial_port *port, 436 unsigned char *buf, int count, int interruptible); 437static int digi_write_inb_command(struct usb_serial_port *port, 438 unsigned char *buf, int count, unsigned long timeout); 439static int digi_set_modem_signals(struct usb_serial_port *port, 440 unsigned int modem_signals, int interruptible); 441static int digi_transmit_idle(struct usb_serial_port *port, 442 unsigned long timeout); 443static void digi_rx_throttle(struct tty_struct *tty); 444static void digi_rx_unthrottle(struct tty_struct *tty); 445static void digi_set_termios(struct tty_struct *tty, 446 struct usb_serial_port *port, struct ktermios *old_termios); 447static void digi_break_ctl(struct tty_struct *tty, int break_state); 448static int digi_tiocmget(struct tty_struct *tty, struct file *file); 449static int digi_tiocmset(struct tty_struct *tty, struct file *file, 450 unsigned int set, unsigned int clear); 451static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 452 const unsigned char *buf, int count); 453static void digi_write_bulk_callback(struct urb *urb); 454static int digi_write_room(struct tty_struct *tty); 455static int digi_chars_in_buffer(struct tty_struct *tty); 456static int digi_open(struct tty_struct *tty, struct usb_serial_port *port); 457static void digi_close(struct usb_serial_port *port); 458static void digi_dtr_rts(struct usb_serial_port *port, int on); 459static int digi_startup_device(struct usb_serial *serial); 460static int digi_startup(struct usb_serial *serial); 461static void digi_disconnect(struct usb_serial *serial); 462static void digi_release(struct usb_serial *serial); 463static void digi_read_bulk_callback(struct urb *urb); 464static int digi_read_inb_callback(struct urb *urb); 465static int digi_read_oob_callback(struct urb *urb); 466 467 468/* Statics */ 469 470static int debug; 471 472static const struct usb_device_id id_table_combined[] = { 473 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 474 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 475 { } /* Terminating entry */ 476}; 477 478static const struct usb_device_id id_table_2[] = { 479 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 480 { } /* Terminating entry */ 481}; 482 483static const struct usb_device_id id_table_4[] = { 484 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 485 { } /* Terminating entry */ 486}; 487 488MODULE_DEVICE_TABLE(usb, id_table_combined); 489 490static struct usb_driver digi_driver = { 491 .name = "digi_acceleport", 492 .probe = usb_serial_probe, 493 .disconnect = usb_serial_disconnect, 494 .id_table = id_table_combined, 495 .no_dynamic_id = 1, 496}; 497 498 499/* device info needed for the Digi serial converter */ 500 501static struct usb_serial_driver digi_acceleport_2_device = { 502 .driver = { 503 .owner = THIS_MODULE, 504 .name = "digi_2", 505 }, 506 .description = "Digi 2 port USB adapter", 507 .usb_driver = &digi_driver, 508 .id_table = id_table_2, 509 .num_ports = 3, 510 .open = digi_open, 511 .close = digi_close, 512 .dtr_rts = digi_dtr_rts, 513 .write = digi_write, 514 .write_room = digi_write_room, 515 .write_bulk_callback = digi_write_bulk_callback, 516 .read_bulk_callback = digi_read_bulk_callback, 517 .chars_in_buffer = digi_chars_in_buffer, 518 .throttle = digi_rx_throttle, 519 .unthrottle = digi_rx_unthrottle, 520 .set_termios = digi_set_termios, 521 .break_ctl = digi_break_ctl, 522 .tiocmget = digi_tiocmget, 523 .tiocmset = digi_tiocmset, 524 .attach = digi_startup, 525 .disconnect = digi_disconnect, 526 .release = digi_release, 527}; 528 529static struct usb_serial_driver digi_acceleport_4_device = { 530 .driver = { 531 .owner = THIS_MODULE, 532 .name = "digi_4", 533 }, 534 .description = "Digi 4 port USB adapter", 535 .usb_driver = &digi_driver, 536 .id_table = id_table_4, 537 .num_ports = 4, 538 .open = digi_open, 539 .close = digi_close, 540 .write = digi_write, 541 .write_room = digi_write_room, 542 .write_bulk_callback = digi_write_bulk_callback, 543 .read_bulk_callback = digi_read_bulk_callback, 544 .chars_in_buffer = digi_chars_in_buffer, 545 .throttle = digi_rx_throttle, 546 .unthrottle = digi_rx_unthrottle, 547 .set_termios = digi_set_termios, 548 .break_ctl = digi_break_ctl, 549 .tiocmget = digi_tiocmget, 550 .tiocmset = digi_tiocmset, 551 .attach = digi_startup, 552 .disconnect = digi_disconnect, 553 .release = digi_release, 554}; 555 556 557/* Functions */ 558 559/* 560 * Cond Wait Interruptible Timeout Irqrestore 561 * 562 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 563 * so that wake ups are not lost if they occur between the unlock 564 * and the sleep. In other words, spin_unlock_irqrestore and 565 * interruptible_sleep_on_timeout are "atomic" with respect to 566 * wake ups. This is used to implement condition variables. 567 * 568 * interruptible_sleep_on_timeout is deprecated and has been replaced 569 * with the equivalent code. 570 */ 571 572static long cond_wait_interruptible_timeout_irqrestore( 573 wait_queue_head_t *q, long timeout, 574 spinlock_t *lock, unsigned long flags) 575__releases(lock) 576{ 577 DEFINE_WAIT(wait); 578 579 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 580 spin_unlock_irqrestore(lock, flags); 581 timeout = schedule_timeout(timeout); 582 finish_wait(q, &wait); 583 584 return timeout; 585} 586 587 588/* 589 * Digi Wakeup Write 590 * 591 * Wake up port, line discipline, and tty processes sleeping 592 * on writes. 593 */ 594 595static void digi_wakeup_write_lock(struct work_struct *work) 596{ 597 struct digi_port *priv = 598 container_of(work, struct digi_port, dp_wakeup_work); 599 struct usb_serial_port *port = priv->dp_port; 600 unsigned long flags; 601 602 spin_lock_irqsave(&priv->dp_port_lock, flags); 603 digi_wakeup_write(port); 604 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 605} 606 607static void digi_wakeup_write(struct usb_serial_port *port) 608{ 609 struct tty_struct *tty = tty_port_tty_get(&port->port); 610 if (tty) { 611 tty_wakeup(tty); 612 tty_kref_put(tty); 613 } 614} 615 616 617/* 618 * Digi Write OOB Command 619 * 620 * Write commands on the out of band port. Commands are 4 621 * bytes each, multiple commands can be sent at once, and 622 * no command will be split across USB packets. Returns 0 623 * if successful, -EINTR if interrupted while sleeping and 624 * the interruptible flag is true, or a negative error 625 * returned by usb_submit_urb. 626 */ 627 628static int digi_write_oob_command(struct usb_serial_port *port, 629 unsigned char *buf, int count, int interruptible) 630{ 631 632 int ret = 0; 633 int len; 634 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 635 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 636 unsigned long flags = 0; 637 638 dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count); 639 640 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 641 while (count > 0) { 642 while (oob_priv->dp_write_urb_in_use) { 643 cond_wait_interruptible_timeout_irqrestore( 644 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 645 &oob_priv->dp_port_lock, flags); 646 if (interruptible && signal_pending(current)) 647 return -EINTR; 648 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 649 } 650 651 /* len must be a multiple of 4, so commands are not split */ 652 len = min(count, oob_port->bulk_out_size); 653 if (len > 4) 654 len &= ~3; 655 memcpy(oob_port->write_urb->transfer_buffer, buf, len); 656 oob_port->write_urb->transfer_buffer_length = len; 657 oob_port->write_urb->dev = port->serial->dev; 658 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 659 if (ret == 0) { 660 oob_priv->dp_write_urb_in_use = 1; 661 count -= len; 662 buf += len; 663 } 664 } 665 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 666 if (ret) 667 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 668 __func__, ret); 669 return ret; 670 671} 672 673 674/* 675 * Digi Write In Band Command 676 * 677 * Write commands on the given port. Commands are 4 678 * bytes each, multiple commands can be sent at once, and 679 * no command will be split across USB packets. If timeout 680 * is non-zero, write in band command will return after 681 * waiting unsuccessfully for the URB status to clear for 682 * timeout ticks. Returns 0 if successful, or a negative 683 * error returned by digi_write. 684 */ 685 686static int digi_write_inb_command(struct usb_serial_port *port, 687 unsigned char *buf, int count, unsigned long timeout) 688{ 689 int ret = 0; 690 int len; 691 struct digi_port *priv = usb_get_serial_port_data(port); 692 unsigned char *data = port->write_urb->transfer_buffer; 693 unsigned long flags = 0; 694 695 dbg("digi_write_inb_command: TOP: port=%d, count=%d", 696 priv->dp_port_num, count); 697 698 if (timeout) 699 timeout += jiffies; 700 else 701 timeout = ULONG_MAX; 702 703 spin_lock_irqsave(&priv->dp_port_lock, flags); 704 while (count > 0 && ret == 0) { 705 while (priv->dp_write_urb_in_use && 706 time_before(jiffies, timeout)) { 707 cond_wait_interruptible_timeout_irqrestore( 708 &port->write_wait, DIGI_RETRY_TIMEOUT, 709 &priv->dp_port_lock, flags); 710 if (signal_pending(current)) 711 return -EINTR; 712 spin_lock_irqsave(&priv->dp_port_lock, flags); 713 } 714 715 /* len must be a multiple of 4 and small enough to */ 716 /* guarantee the write will send buffered data first, */ 717 /* so commands are in order with data and not split */ 718 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 719 if (len > 4) 720 len &= ~3; 721 722 /* write any buffered data first */ 723 if (priv->dp_out_buf_len > 0) { 724 data[0] = DIGI_CMD_SEND_DATA; 725 data[1] = priv->dp_out_buf_len; 726 memcpy(data + 2, priv->dp_out_buf, 727 priv->dp_out_buf_len); 728 memcpy(data + 2 + priv->dp_out_buf_len, buf, len); 729 port->write_urb->transfer_buffer_length 730 = priv->dp_out_buf_len + 2 + len; 731 } else { 732 memcpy(data, buf, len); 733 port->write_urb->transfer_buffer_length = len; 734 } 735 port->write_urb->dev = port->serial->dev; 736 737 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 738 if (ret == 0) { 739 priv->dp_write_urb_in_use = 1; 740 priv->dp_out_buf_len = 0; 741 count -= len; 742 buf += len; 743 } 744 745 } 746 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 747 748 if (ret) 749 dev_err(&port->dev, 750 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 751 __func__, ret, priv->dp_port_num); 752 return ret; 753} 754 755 756/* 757 * Digi Set Modem Signals 758 * 759 * Sets or clears DTR and RTS on the port, according to the 760 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 761 * for the modem_signals argument. Returns 0 if successful, 762 * -EINTR if interrupted while sleeping, or a non-zero error 763 * returned by usb_submit_urb. 764 */ 765 766static int digi_set_modem_signals(struct usb_serial_port *port, 767 unsigned int modem_signals, int interruptible) 768{ 769 770 int ret; 771 struct digi_port *port_priv = usb_get_serial_port_data(port); 772 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 773 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 774 unsigned char *data = oob_port->write_urb->transfer_buffer; 775 unsigned long flags = 0; 776 777 778 dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", 779 port_priv->dp_port_num, modem_signals); 780 781 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 782 spin_lock(&port_priv->dp_port_lock); 783 784 while (oob_priv->dp_write_urb_in_use) { 785 spin_unlock(&port_priv->dp_port_lock); 786 cond_wait_interruptible_timeout_irqrestore( 787 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 788 &oob_priv->dp_port_lock, flags); 789 if (interruptible && signal_pending(current)) 790 return -EINTR; 791 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 792 spin_lock(&port_priv->dp_port_lock); 793 } 794 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 795 data[1] = port_priv->dp_port_num; 796 data[2] = (modem_signals & TIOCM_DTR) ? 797 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 798 data[3] = 0; 799 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 800 data[5] = port_priv->dp_port_num; 801 data[6] = (modem_signals & TIOCM_RTS) ? 802 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 803 data[7] = 0; 804 805 oob_port->write_urb->transfer_buffer_length = 8; 806 oob_port->write_urb->dev = port->serial->dev; 807 808 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 809 if (ret == 0) { 810 oob_priv->dp_write_urb_in_use = 1; 811 port_priv->dp_modem_signals = 812 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 813 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 814 } 815 spin_unlock(&port_priv->dp_port_lock); 816 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 817 if (ret) 818 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 819 __func__, ret); 820 return ret; 821} 822 823/* 824 * Digi Transmit Idle 825 * 826 * Digi transmit idle waits, up to timeout ticks, for the transmitter 827 * to go idle. It returns 0 if successful or a negative error. 828 * 829 * There are race conditions here if more than one process is calling 830 * digi_transmit_idle on the same port at the same time. However, this 831 * is only called from close, and only one process can be in close on a 832 * port at a time, so its ok. 833 */ 834 835static int digi_transmit_idle(struct usb_serial_port *port, 836 unsigned long timeout) 837{ 838 int ret; 839 unsigned char buf[2]; 840 struct digi_port *priv = usb_get_serial_port_data(port); 841 unsigned long flags = 0; 842 843 spin_lock_irqsave(&priv->dp_port_lock, flags); 844 priv->dp_transmit_idle = 0; 845 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 846 847 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 848 buf[1] = 0; 849 850 timeout += jiffies; 851 852 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies); 853 if (ret != 0) 854 return ret; 855 856 spin_lock_irqsave(&priv->dp_port_lock, flags); 857 858 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) { 859 cond_wait_interruptible_timeout_irqrestore( 860 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 861 &priv->dp_port_lock, flags); 862 if (signal_pending(current)) 863 return -EINTR; 864 spin_lock_irqsave(&priv->dp_port_lock, flags); 865 } 866 priv->dp_transmit_idle = 0; 867 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 868 return 0; 869 870} 871 872 873static void digi_rx_throttle(struct tty_struct *tty) 874{ 875 unsigned long flags; 876 struct usb_serial_port *port = tty->driver_data; 877 struct digi_port *priv = usb_get_serial_port_data(port); 878 879 880 dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num); 881 882 /* stop receiving characters by not resubmitting the read urb */ 883 spin_lock_irqsave(&priv->dp_port_lock, flags); 884 priv->dp_throttled = 1; 885 priv->dp_throttle_restart = 0; 886 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 887} 888 889 890static void digi_rx_unthrottle(struct tty_struct *tty) 891{ 892 int ret = 0; 893 unsigned long flags; 894 struct usb_serial_port *port = tty->driver_data; 895 struct digi_port *priv = usb_get_serial_port_data(port); 896 897 dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num); 898 899 spin_lock_irqsave(&priv->dp_port_lock, flags); 900 901 /* restart read chain */ 902 if (priv->dp_throttle_restart) { 903 port->read_urb->dev = port->serial->dev; 904 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC); 905 } 906 907 /* turn throttle off */ 908 priv->dp_throttled = 0; 909 priv->dp_throttle_restart = 0; 910 911 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 912 913 if (ret) 914 dev_err(&port->dev, 915 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 916 __func__, ret, priv->dp_port_num); 917} 918 919 920static void digi_set_termios(struct tty_struct *tty, 921 struct usb_serial_port *port, struct ktermios *old_termios) 922{ 923 struct digi_port *priv = usb_get_serial_port_data(port); 924 unsigned int iflag = tty->termios->c_iflag; 925 unsigned int cflag = tty->termios->c_cflag; 926 unsigned int old_iflag = old_termios->c_iflag; 927 unsigned int old_cflag = old_termios->c_cflag; 928 unsigned char buf[32]; 929 unsigned int modem_signals; 930 int arg, ret; 931 int i = 0; 932 speed_t baud; 933 934 dbg("digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag); 935 936 /* set baud rate */ 937 baud = tty_get_baud_rate(tty); 938 if (baud != tty_termios_baud_rate(old_termios)) { 939 arg = -1; 940 941 /* reassert DTR and (maybe) RTS on transition from B0 */ 942 if ((old_cflag&CBAUD) == B0) { 943 /* don't set RTS if using hardware flow control */ 944 /* and throttling input */ 945 modem_signals = TIOCM_DTR; 946 if (!(tty->termios->c_cflag & CRTSCTS) || 947 !test_bit(TTY_THROTTLED, &tty->flags)) 948 modem_signals |= TIOCM_RTS; 949 digi_set_modem_signals(port, modem_signals, 1); 950 } 951 switch (baud) { 952 /* drop DTR and RTS on transition to B0 */ 953 case 0: digi_set_modem_signals(port, 0, 1); break; 954 case 50: arg = DIGI_BAUD_50; break; 955 case 75: arg = DIGI_BAUD_75; break; 956 case 110: arg = DIGI_BAUD_110; break; 957 case 150: arg = DIGI_BAUD_150; break; 958 case 200: arg = DIGI_BAUD_200; break; 959 case 300: arg = DIGI_BAUD_300; break; 960 case 600: arg = DIGI_BAUD_600; break; 961 case 1200: arg = DIGI_BAUD_1200; break; 962 case 1800: arg = DIGI_BAUD_1800; break; 963 case 2400: arg = DIGI_BAUD_2400; break; 964 case 4800: arg = DIGI_BAUD_4800; break; 965 case 9600: arg = DIGI_BAUD_9600; break; 966 case 19200: arg = DIGI_BAUD_19200; break; 967 case 38400: arg = DIGI_BAUD_38400; break; 968 case 57600: arg = DIGI_BAUD_57600; break; 969 case 115200: arg = DIGI_BAUD_115200; break; 970 case 230400: arg = DIGI_BAUD_230400; break; 971 case 460800: arg = DIGI_BAUD_460800; break; 972 default: 973 arg = DIGI_BAUD_9600; 974 baud = 9600; 975 break; 976 } 977 if (arg != -1) { 978 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 979 buf[i++] = priv->dp_port_num; 980 buf[i++] = arg; 981 buf[i++] = 0; 982 } 983 } 984 /* set parity */ 985 tty->termios->c_cflag &= ~CMSPAR; 986 987 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) { 988 if (cflag&PARENB) { 989 if (cflag&PARODD) 990 arg = DIGI_PARITY_ODD; 991 else 992 arg = DIGI_PARITY_EVEN; 993 } else { 994 arg = DIGI_PARITY_NONE; 995 } 996 buf[i++] = DIGI_CMD_SET_PARITY; 997 buf[i++] = priv->dp_port_num; 998 buf[i++] = arg; 999 buf[i++] = 0; 1000 } 1001 /* set word size */ 1002 if ((cflag&CSIZE) != (old_cflag&CSIZE)) { 1003 arg = -1; 1004 switch (cflag&CSIZE) { 1005 case CS5: arg = DIGI_WORD_SIZE_5; break; 1006 case CS6: arg = DIGI_WORD_SIZE_6; break; 1007 case CS7: arg = DIGI_WORD_SIZE_7; break; 1008 case CS8: arg = DIGI_WORD_SIZE_8; break; 1009 default: 1010 dbg("digi_set_termios: can't handle word size %d", 1011 (cflag&CSIZE)); 1012 break; 1013 } 1014 1015 if (arg != -1) { 1016 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 1017 buf[i++] = priv->dp_port_num; 1018 buf[i++] = arg; 1019 buf[i++] = 0; 1020 } 1021 1022 } 1023 1024 /* set stop bits */ 1025 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) { 1026 1027 if ((cflag&CSTOPB)) 1028 arg = DIGI_STOP_BITS_2; 1029 else 1030 arg = DIGI_STOP_BITS_1; 1031 1032 buf[i++] = DIGI_CMD_SET_STOP_BITS; 1033 buf[i++] = priv->dp_port_num; 1034 buf[i++] = arg; 1035 buf[i++] = 0; 1036 1037 } 1038 1039 /* set input flow control */ 1040 if ((iflag&IXOFF) != (old_iflag&IXOFF) 1041 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) { 1042 arg = 0; 1043 if (iflag&IXOFF) 1044 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1045 else 1046 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1047 1048 if (cflag&CRTSCTS) { 1049 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 1050 1051 /* On USB-4 it is necessary to assert RTS prior */ 1052 /* to selecting RTS input flow control. */ 1053 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 1054 buf[i++] = priv->dp_port_num; 1055 buf[i++] = DIGI_RTS_ACTIVE; 1056 buf[i++] = 0; 1057 1058 } else { 1059 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 1060 } 1061 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1062 buf[i++] = priv->dp_port_num; 1063 buf[i++] = arg; 1064 buf[i++] = 0; 1065 } 1066 1067 /* set output flow control */ 1068 if ((iflag & IXON) != (old_iflag & IXON) 1069 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1070 arg = 0; 1071 if (iflag & IXON) 1072 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1073 else 1074 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1075 1076 if (cflag & CRTSCTS) { 1077 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 1078 } else { 1079 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 1080 tty->hw_stopped = 0; 1081 } 1082 1083 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1084 buf[i++] = priv->dp_port_num; 1085 buf[i++] = arg; 1086 buf[i++] = 0; 1087 } 1088 1089 /* set receive enable/disable */ 1090 if ((cflag & CREAD) != (old_cflag & CREAD)) { 1091 if (cflag & CREAD) 1092 arg = DIGI_ENABLE; 1093 else 1094 arg = DIGI_DISABLE; 1095 1096 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 1097 buf[i++] = priv->dp_port_num; 1098 buf[i++] = arg; 1099 buf[i++] = 0; 1100 } 1101 ret = digi_write_oob_command(port, buf, i, 1); 1102 if (ret != 0) 1103 dbg("digi_set_termios: write oob failed, ret=%d", ret); 1104 tty_encode_baud_rate(tty, baud, baud); 1105} 1106 1107 1108static void digi_break_ctl(struct tty_struct *tty, int break_state) 1109{ 1110 struct usb_serial_port *port = tty->driver_data; 1111 unsigned char buf[4]; 1112 1113 buf[0] = DIGI_CMD_BREAK_CONTROL; 1114 buf[1] = 2; /* length */ 1115 buf[2] = break_state ? 1 : 0; 1116 buf[3] = 0; /* pad */ 1117 digi_write_inb_command(port, buf, 4, 0); 1118} 1119 1120 1121static int digi_tiocmget(struct tty_struct *tty, struct file *file) 1122{ 1123 struct usb_serial_port *port = tty->driver_data; 1124 struct digi_port *priv = usb_get_serial_port_data(port); 1125 unsigned int val; 1126 unsigned long flags; 1127 1128 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num); 1129 1130 spin_lock_irqsave(&priv->dp_port_lock, flags); 1131 val = priv->dp_modem_signals; 1132 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1133 return val; 1134} 1135 1136 1137static int digi_tiocmset(struct tty_struct *tty, struct file *file, 1138 unsigned int set, unsigned int clear) 1139{ 1140 struct usb_serial_port *port = tty->driver_data; 1141 struct digi_port *priv = usb_get_serial_port_data(port); 1142 unsigned int val; 1143 unsigned long flags; 1144 1145 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num); 1146 1147 spin_lock_irqsave(&priv->dp_port_lock, flags); 1148 val = (priv->dp_modem_signals & ~clear) | set; 1149 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1150 return digi_set_modem_signals(port, val, 1); 1151} 1152 1153 1154static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 1155 const unsigned char *buf, int count) 1156{ 1157 1158 int ret, data_len, new_len; 1159 struct digi_port *priv = usb_get_serial_port_data(port); 1160 unsigned char *data = port->write_urb->transfer_buffer; 1161 unsigned long flags = 0; 1162 1163 dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", 1164 priv->dp_port_num, count, in_interrupt()); 1165 1166 /* copy user data (which can sleep) before getting spin lock */ 1167 count = min(count, port->bulk_out_size-2); 1168 count = min(64, count); 1169 1170 /* be sure only one write proceeds at a time */ 1171 /* there are races on the port private buffer */ 1172 spin_lock_irqsave(&priv->dp_port_lock, flags); 1173 1174 /* wait for urb status clear to submit another urb */ 1175 if (priv->dp_write_urb_in_use) { 1176 /* buffer data if count is 1 (probably put_char) if possible */ 1177 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) { 1178 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 1179 new_len = 1; 1180 } else { 1181 new_len = 0; 1182 } 1183 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1184 return new_len; 1185 } 1186 1187 /* allow space for any buffered data and for new data, up to */ 1188 /* transfer buffer size - 2 (for command and length bytes) */ 1189 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 1190 data_len = new_len + priv->dp_out_buf_len; 1191 1192 if (data_len == 0) { 1193 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1194 return 0; 1195 } 1196 1197 port->write_urb->transfer_buffer_length = data_len+2; 1198 port->write_urb->dev = port->serial->dev; 1199 1200 *data++ = DIGI_CMD_SEND_DATA; 1201 *data++ = data_len; 1202 1203 /* copy in buffered data first */ 1204 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len); 1205 data += priv->dp_out_buf_len; 1206 1207 /* copy in new data */ 1208 memcpy(data, buf, new_len); 1209 1210 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1211 if (ret == 0) { 1212 priv->dp_write_urb_in_use = 1; 1213 ret = new_len; 1214 priv->dp_out_buf_len = 0; 1215 } 1216 1217 /* return length of new data written, or error */ 1218 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1219 if (ret < 0) 1220 dev_err(&port->dev, 1221 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1222 __func__, ret, priv->dp_port_num); 1223 dbg("digi_write: returning %d", ret); 1224 return ret; 1225 1226} 1227 1228static void digi_write_bulk_callback(struct urb *urb) 1229{ 1230 1231 struct usb_serial_port *port = urb->context; 1232 struct usb_serial *serial; 1233 struct digi_port *priv; 1234 struct digi_serial *serial_priv; 1235 int ret = 0; 1236 int status = urb->status; 1237 1238 dbg("digi_write_bulk_callback: TOP, status=%d", status); 1239 1240 /* port and serial sanity check */ 1241 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { 1242 pr_err("%s: port or port->private is NULL, status=%d\n", 1243 __func__, status); 1244 return; 1245 } 1246 serial = port->serial; 1247 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) { 1248 dev_err(&port->dev, 1249 "%s: serial or serial->private is NULL, status=%d\n", 1250 __func__, status); 1251 return; 1252 } 1253 1254 /* handle oob callback */ 1255 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1256 dbg("digi_write_bulk_callback: oob callback"); 1257 spin_lock(&priv->dp_port_lock); 1258 priv->dp_write_urb_in_use = 0; 1259 wake_up_interruptible(&port->write_wait); 1260 spin_unlock(&priv->dp_port_lock); 1261 return; 1262 } 1263 1264 /* try to send any buffered data on this port */ 1265 spin_lock(&priv->dp_port_lock); 1266 priv->dp_write_urb_in_use = 0; 1267 if (priv->dp_out_buf_len > 0) { 1268 *((unsigned char *)(port->write_urb->transfer_buffer)) 1269 = (unsigned char)DIGI_CMD_SEND_DATA; 1270 *((unsigned char *)(port->write_urb->transfer_buffer) + 1) 1271 = (unsigned char)priv->dp_out_buf_len; 1272 port->write_urb->transfer_buffer_length = 1273 priv->dp_out_buf_len + 2; 1274 port->write_urb->dev = serial->dev; 1275 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf, 1276 priv->dp_out_buf_len); 1277 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1278 if (ret == 0) { 1279 priv->dp_write_urb_in_use = 1; 1280 priv->dp_out_buf_len = 0; 1281 } 1282 } 1283 /* wake up processes sleeping on writes immediately */ 1284 digi_wakeup_write(port); 1285 /* also queue up a wakeup at scheduler time, in case we */ 1286 /* lost the race in write_chan(). */ 1287 schedule_work(&priv->dp_wakeup_work); 1288 1289 spin_unlock(&priv->dp_port_lock); 1290 if (ret && ret != -EPERM) 1291 dev_err(&port->dev, 1292 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1293 __func__, ret, priv->dp_port_num); 1294} 1295 1296static int digi_write_room(struct tty_struct *tty) 1297{ 1298 struct usb_serial_port *port = tty->driver_data; 1299 struct digi_port *priv = usb_get_serial_port_data(port); 1300 int room; 1301 unsigned long flags = 0; 1302 1303 spin_lock_irqsave(&priv->dp_port_lock, flags); 1304 1305 if (priv->dp_write_urb_in_use) 1306 room = 0; 1307 else 1308 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1309 1310 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1311 dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room); 1312 return room; 1313 1314} 1315 1316static int digi_chars_in_buffer(struct tty_struct *tty) 1317{ 1318 struct usb_serial_port *port = tty->driver_data; 1319 struct digi_port *priv = usb_get_serial_port_data(port); 1320 1321 if (priv->dp_write_urb_in_use) { 1322 dbg("digi_chars_in_buffer: port=%d, chars=%d", 1323 priv->dp_port_num, port->bulk_out_size - 2); 1324 /* return(port->bulk_out_size - 2); */ 1325 return 256; 1326 } else { 1327 dbg("digi_chars_in_buffer: port=%d, chars=%d", 1328 priv->dp_port_num, priv->dp_out_buf_len); 1329 return priv->dp_out_buf_len; 1330 } 1331 1332} 1333 1334static void digi_dtr_rts(struct usb_serial_port *port, int on) 1335{ 1336 /* Adjust DTR and RTS */ 1337 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1); 1338} 1339 1340static int digi_open(struct tty_struct *tty, struct usb_serial_port *port) 1341{ 1342 int ret; 1343 unsigned char buf[32]; 1344 struct digi_port *priv = usb_get_serial_port_data(port); 1345 struct ktermios not_termios; 1346 1347 dbg("digi_open: TOP: port=%d", priv->dp_port_num); 1348 1349 /* be sure the device is started up */ 1350 if (digi_startup_device(port->serial) != 0) 1351 return -ENXIO; 1352 1353 /* read modem signals automatically whenever they change */ 1354 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1355 buf[1] = priv->dp_port_num; 1356 buf[2] = DIGI_ENABLE; 1357 buf[3] = 0; 1358 1359 /* flush fifos */ 1360 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1361 buf[5] = priv->dp_port_num; 1362 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1363 buf[7] = 0; 1364 1365 ret = digi_write_oob_command(port, buf, 8, 1); 1366 if (ret != 0) 1367 dbg("digi_open: write oob failed, ret=%d", ret); 1368 1369 /* set termios settings */ 1370 if (tty) { 1371 not_termios.c_cflag = ~tty->termios->c_cflag; 1372 not_termios.c_iflag = ~tty->termios->c_iflag; 1373 digi_set_termios(tty, port, ¬_termios); 1374 } 1375 return 0; 1376} 1377 1378 1379static void digi_close(struct usb_serial_port *port) 1380{ 1381 DEFINE_WAIT(wait); 1382 int ret; 1383 unsigned char buf[32]; 1384 struct digi_port *priv = usb_get_serial_port_data(port); 1385 1386 dbg("digi_close: TOP: port=%d", priv->dp_port_num); 1387 1388 mutex_lock(&port->serial->disc_mutex); 1389 /* if disconnected, just clear flags */ 1390 if (port->serial->disconnected) 1391 goto exit; 1392 1393 if (port->serial->dev) { 1394 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT); 1395 1396 /* disable input flow control */ 1397 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1398 buf[1] = priv->dp_port_num; 1399 buf[2] = DIGI_DISABLE; 1400 buf[3] = 0; 1401 1402 /* disable output flow control */ 1403 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1404 buf[5] = priv->dp_port_num; 1405 buf[6] = DIGI_DISABLE; 1406 buf[7] = 0; 1407 1408 /* disable reading modem signals automatically */ 1409 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1410 buf[9] = priv->dp_port_num; 1411 buf[10] = DIGI_DISABLE; 1412 buf[11] = 0; 1413 1414 /* disable receive */ 1415 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1416 buf[13] = priv->dp_port_num; 1417 buf[14] = DIGI_DISABLE; 1418 buf[15] = 0; 1419 1420 /* flush fifos */ 1421 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1422 buf[17] = priv->dp_port_num; 1423 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1424 buf[19] = 0; 1425 1426 ret = digi_write_oob_command(port, buf, 20, 0); 1427 if (ret != 0) 1428 dbg("digi_close: write oob failed, ret=%d", ret); 1429 1430 /* wait for final commands on oob port to complete */ 1431 prepare_to_wait(&priv->dp_flush_wait, &wait, 1432 TASK_INTERRUPTIBLE); 1433 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1434 finish_wait(&priv->dp_flush_wait, &wait); 1435 1436 /* shutdown any outstanding bulk writes */ 1437 usb_kill_urb(port->write_urb); 1438 } 1439exit: 1440 spin_lock_irq(&priv->dp_port_lock); 1441 priv->dp_write_urb_in_use = 0; 1442 wake_up_interruptible(&priv->dp_close_wait); 1443 spin_unlock_irq(&priv->dp_port_lock); 1444 mutex_unlock(&port->serial->disc_mutex); 1445 dbg("digi_close: done"); 1446} 1447 1448 1449/* 1450 * Digi Startup Device 1451 * 1452 * Starts reads on all ports. Must be called AFTER startup, with 1453 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1454 */ 1455 1456static int digi_startup_device(struct usb_serial *serial) 1457{ 1458 int i, ret = 0; 1459 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1460 struct usb_serial_port *port; 1461 1462 /* be sure this happens exactly once */ 1463 spin_lock(&serial_priv->ds_serial_lock); 1464 if (serial_priv->ds_device_started) { 1465 spin_unlock(&serial_priv->ds_serial_lock); 1466 return 0; 1467 } 1468 serial_priv->ds_device_started = 1; 1469 spin_unlock(&serial_priv->ds_serial_lock); 1470 1471 /* start reading from each bulk in endpoint for the device */ 1472 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1473 for (i = 0; i < serial->type->num_ports + 1; i++) { 1474 port = serial->port[i]; 1475 port->write_urb->dev = port->serial->dev; 1476 ret = usb_submit_urb(port->read_urb, GFP_KERNEL); 1477 if (ret != 0) { 1478 dev_err(&port->dev, 1479 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1480 __func__, ret, i); 1481 break; 1482 } 1483 } 1484 return ret; 1485} 1486 1487 1488static int digi_startup(struct usb_serial *serial) 1489{ 1490 1491 int i; 1492 struct digi_port *priv; 1493 struct digi_serial *serial_priv; 1494 1495 dbg("digi_startup: TOP"); 1496 1497 /* allocate the private data structures for all ports */ 1498 /* number of regular ports + 1 for the out-of-band port */ 1499 for (i = 0; i < serial->type->num_ports + 1; i++) { 1500 /* allocate port private structure */ 1501 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL); 1502 if (priv == NULL) { 1503 while (--i >= 0) 1504 kfree(usb_get_serial_port_data(serial->port[i])); 1505 return 1; /* error */ 1506 } 1507 1508 /* initialize port private structure */ 1509 spin_lock_init(&priv->dp_port_lock); 1510 priv->dp_port_num = i; 1511 priv->dp_out_buf_len = 0; 1512 priv->dp_write_urb_in_use = 0; 1513 priv->dp_modem_signals = 0; 1514 init_waitqueue_head(&priv->dp_modem_change_wait); 1515 priv->dp_transmit_idle = 0; 1516 init_waitqueue_head(&priv->dp_transmit_idle_wait); 1517 priv->dp_throttled = 0; 1518 priv->dp_throttle_restart = 0; 1519 init_waitqueue_head(&priv->dp_flush_wait); 1520 init_waitqueue_head(&priv->dp_close_wait); 1521 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); 1522 priv->dp_port = serial->port[i]; 1523 /* initialize write wait queue for this port */ 1524 init_waitqueue_head(&serial->port[i]->write_wait); 1525 1526 usb_set_serial_port_data(serial->port[i], priv); 1527 } 1528 1529 /* allocate serial private structure */ 1530 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL); 1531 if (serial_priv == NULL) { 1532 for (i = 0; i < serial->type->num_ports + 1; i++) 1533 kfree(usb_get_serial_port_data(serial->port[i])); 1534 return 1; /* error */ 1535 } 1536 1537 /* initialize serial private structure */ 1538 spin_lock_init(&serial_priv->ds_serial_lock); 1539 serial_priv->ds_oob_port_num = serial->type->num_ports; 1540 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1541 serial_priv->ds_device_started = 0; 1542 usb_set_serial_data(serial, serial_priv); 1543 1544 return 0; 1545} 1546 1547 1548static void digi_disconnect(struct usb_serial *serial) 1549{ 1550 int i; 1551 dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt()); 1552 1553 /* stop reads and writes on all ports */ 1554 for (i = 0; i < serial->type->num_ports + 1; i++) { 1555 usb_kill_urb(serial->port[i]->read_urb); 1556 usb_kill_urb(serial->port[i]->write_urb); 1557 } 1558} 1559 1560 1561static void digi_release(struct usb_serial *serial) 1562{ 1563 int i; 1564 dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt()); 1565 1566 /* free the private data structures for all ports */ 1567 /* number of regular ports + 1 for the out-of-band port */ 1568 for (i = 0; i < serial->type->num_ports + 1; i++) 1569 kfree(usb_get_serial_port_data(serial->port[i])); 1570 kfree(usb_get_serial_data(serial)); 1571} 1572 1573 1574static void digi_read_bulk_callback(struct urb *urb) 1575{ 1576 struct usb_serial_port *port = urb->context; 1577 struct digi_port *priv; 1578 struct digi_serial *serial_priv; 1579 int ret; 1580 int status = urb->status; 1581 1582 dbg("digi_read_bulk_callback: TOP"); 1583 1584 /* port sanity check, do not resubmit if port is not valid */ 1585 if (port == NULL) 1586 return; 1587 priv = usb_get_serial_port_data(port); 1588 if (priv == NULL) { 1589 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n", 1590 __func__, status); 1591 return; 1592 } 1593 if (port->serial == NULL || 1594 (serial_priv = usb_get_serial_data(port->serial)) == NULL) { 1595 dev_err(&port->dev, "%s: serial is bad or serial->private " 1596 "is NULL, status=%d\n", __func__, status); 1597 return; 1598 } 1599 1600 /* do not resubmit urb if it has any status error */ 1601 if (status) { 1602 dev_err(&port->dev, 1603 "%s: nonzero read bulk status: status=%d, port=%d\n", 1604 __func__, status, priv->dp_port_num); 1605 return; 1606 } 1607 1608 /* handle oob or inb callback, do not resubmit if error */ 1609 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1610 if (digi_read_oob_callback(urb) != 0) 1611 return; 1612 } else { 1613 if (digi_read_inb_callback(urb) != 0) 1614 return; 1615 } 1616 1617 /* continue read */ 1618 urb->dev = port->serial->dev; 1619 ret = usb_submit_urb(urb, GFP_ATOMIC); 1620 if (ret != 0 && ret != -EPERM) { 1621 dev_err(&port->dev, 1622 "%s: failed resubmitting urb, ret=%d, port=%d\n", 1623 __func__, ret, priv->dp_port_num); 1624 } 1625 1626} 1627 1628/* 1629 * Digi Read INB Callback 1630 * 1631 * Digi Read INB Callback handles reads on the in band ports, sending 1632 * the data on to the tty subsystem. When called we know port and 1633 * port->private are not NULL and port->serial has been validated. 1634 * It returns 0 if successful, 1 if successful but the port is 1635 * throttled, and -1 if the sanity checks failed. 1636 */ 1637 1638static int digi_read_inb_callback(struct urb *urb) 1639{ 1640 1641 struct usb_serial_port *port = urb->context; 1642 struct tty_struct *tty; 1643 struct digi_port *priv = usb_get_serial_port_data(port); 1644 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1645 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1646 int port_status = ((unsigned char *)urb->transfer_buffer)[2]; 1647 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3; 1648 int flag, throttled; 1649 int status = urb->status; 1650 1651 /* do not process callbacks on closed ports */ 1652 /* but do continue the read chain */ 1653 if (urb->status == -ENOENT) 1654 return 0; 1655 1656 /* short/multiple packet check */ 1657 if (urb->actual_length != len + 2) { 1658 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, " 1659 "status=%d, port=%d, opcode=%d, len=%d, " 1660 "actual_length=%d, status=%d\n", __func__, status, 1661 priv->dp_port_num, opcode, len, urb->actual_length, 1662 port_status); 1663 return -1; 1664 } 1665 1666 tty = tty_port_tty_get(&port->port); 1667 spin_lock(&priv->dp_port_lock); 1668 1669 /* check for throttle; if set, do not resubmit read urb */ 1670 /* indicate the read chain needs to be restarted on unthrottle */ 1671 throttled = priv->dp_throttled; 1672 if (throttled) 1673 priv->dp_throttle_restart = 1; 1674 1675 /* receive data */ 1676 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) { 1677 /* get flag from port_status */ 1678 flag = 0; 1679 1680 /* overrun is special, not associated with a char */ 1681 if (port_status & DIGI_OVERRUN_ERROR) 1682 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 1683 1684 /* break takes precedence over parity, */ 1685 /* which takes precedence over framing errors */ 1686 if (port_status & DIGI_BREAK_ERROR) 1687 flag = TTY_BREAK; 1688 else if (port_status & DIGI_PARITY_ERROR) 1689 flag = TTY_PARITY; 1690 else if (port_status & DIGI_FRAMING_ERROR) 1691 flag = TTY_FRAME; 1692 1693 /* data length is len-1 (one byte of len is port_status) */ 1694 --len; 1695 if (len > 0) { 1696 tty_insert_flip_string_fixed_flag(tty, data, flag, 1697 len); 1698 tty_flip_buffer_push(tty); 1699 } 1700 } 1701 spin_unlock(&priv->dp_port_lock); 1702 tty_kref_put(tty); 1703 1704 if (opcode == DIGI_CMD_RECEIVE_DISABLE) 1705 dbg("%s: got RECEIVE_DISABLE", __func__); 1706 else if (opcode != DIGI_CMD_RECEIVE_DATA) 1707 dbg("%s: unknown opcode: %d", __func__, opcode); 1708 1709 return throttled ? 1 : 0; 1710 1711} 1712 1713 1714/* 1715 * Digi Read OOB Callback 1716 * 1717 * Digi Read OOB Callback handles reads on the out of band port. 1718 * When called we know port and port->private are not NULL and 1719 * the port->serial is valid. It returns 0 if successful, and 1720 * -1 if the sanity checks failed. 1721 */ 1722 1723static int digi_read_oob_callback(struct urb *urb) 1724{ 1725 1726 struct usb_serial_port *port = urb->context; 1727 struct usb_serial *serial = port->serial; 1728 struct tty_struct *tty; 1729 struct digi_port *priv = usb_get_serial_port_data(port); 1730 int opcode, line, status, val; 1731 int i; 1732 unsigned int rts; 1733 1734 dbg("digi_read_oob_callback: port=%d, len=%d", 1735 priv->dp_port_num, urb->actual_length); 1736 1737 /* handle each oob command */ 1738 for (i = 0; i < urb->actual_length - 3;) { 1739 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1740 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1741 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1742 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1743 1744 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", 1745 opcode, line, status, val); 1746 1747 if (status != 0 || line >= serial->type->num_ports) 1748 continue; 1749 1750 port = serial->port[line]; 1751 1752 priv = usb_get_serial_port_data(port); 1753 if (priv == NULL) 1754 return -1; 1755 1756 tty = tty_port_tty_get(&port->port); 1757 1758 rts = 0; 1759 if (tty) 1760 rts = tty->termios->c_cflag & CRTSCTS; 1761 1762 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) { 1763 spin_lock(&priv->dp_port_lock); 1764 /* convert from digi flags to termiox flags */ 1765 if (val & DIGI_READ_INPUT_SIGNALS_CTS) { 1766 priv->dp_modem_signals |= TIOCM_CTS; 1767 /* port must be open to use tty struct */ 1768 if (rts) { 1769 tty->hw_stopped = 0; 1770 digi_wakeup_write(port); 1771 } 1772 } else { 1773 priv->dp_modem_signals &= ~TIOCM_CTS; 1774 /* port must be open to use tty struct */ 1775 if (rts) 1776 tty->hw_stopped = 1; 1777 } 1778 if (val & DIGI_READ_INPUT_SIGNALS_DSR) 1779 priv->dp_modem_signals |= TIOCM_DSR; 1780 else 1781 priv->dp_modem_signals &= ~TIOCM_DSR; 1782 if (val & DIGI_READ_INPUT_SIGNALS_RI) 1783 priv->dp_modem_signals |= TIOCM_RI; 1784 else 1785 priv->dp_modem_signals &= ~TIOCM_RI; 1786 if (val & DIGI_READ_INPUT_SIGNALS_DCD) 1787 priv->dp_modem_signals |= TIOCM_CD; 1788 else 1789 priv->dp_modem_signals &= ~TIOCM_CD; 1790 1791 wake_up_interruptible(&priv->dp_modem_change_wait); 1792 spin_unlock(&priv->dp_port_lock); 1793 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { 1794 spin_lock(&priv->dp_port_lock); 1795 priv->dp_transmit_idle = 1; 1796 wake_up_interruptible(&priv->dp_transmit_idle_wait); 1797 spin_unlock(&priv->dp_port_lock); 1798 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) { 1799 wake_up_interruptible(&priv->dp_flush_wait); 1800 } 1801 tty_kref_put(tty); 1802 } 1803 return 0; 1804 1805} 1806 1807static int __init digi_init(void) 1808{ 1809 int retval; 1810 retval = usb_serial_register(&digi_acceleport_2_device); 1811 if (retval) 1812 goto failed_acceleport_2_device; 1813 retval = usb_serial_register(&digi_acceleport_4_device); 1814 if (retval) 1815 goto failed_acceleport_4_device; 1816 retval = usb_register(&digi_driver); 1817 if (retval) 1818 goto failed_usb_register; 1819 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1820 DRIVER_DESC "\n"); 1821 return 0; 1822failed_usb_register: 1823 usb_serial_deregister(&digi_acceleport_4_device); 1824failed_acceleport_4_device: 1825 usb_serial_deregister(&digi_acceleport_2_device); 1826failed_acceleport_2_device: 1827 return retval; 1828} 1829 1830static void __exit digi_exit (void) 1831{ 1832 usb_deregister(&digi_driver); 1833 usb_serial_deregister(&digi_acceleport_2_device); 1834 usb_serial_deregister(&digi_acceleport_4_device); 1835} 1836 1837 1838module_init(digi_init); 1839module_exit(digi_exit); 1840 1841 1842MODULE_AUTHOR(DRIVER_AUTHOR); 1843MODULE_DESCRIPTION(DRIVER_DESC); 1844MODULE_LICENSE("GPL"); 1845 1846module_param(debug, bool, S_IRUGO | S_IWUSR); 1847MODULE_PARM_DESC(debug, "Debug enabled or not"); 1848