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->open_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* $Id: digi_acceleport.c,v 1.1.1.1 2007/08/03 18:53:02 Exp $ 234*/ 235 236#include <linux/kernel.h> 237#include <linux/errno.h> 238#include <linux/init.h> 239#include <linux/slab.h> 240#include <linux/tty.h> 241#include <linux/tty_driver.h> 242#include <linux/tty_flip.h> 243#include <linux/module.h> 244#include <linux/spinlock.h> 245#include <linux/workqueue.h> 246#include <asm/uaccess.h> 247#include <linux/usb.h> 248#include <linux/wait.h> 249#include <linux/usb/serial.h> 250 251/* Defines */ 252 253/* 254 * Version Information 255 */ 256#define DRIVER_VERSION "v1.80.1.2" 257#define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 258#define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 259 260/* port output buffer length -- must be <= transfer buffer length - 2 */ 261/* so we can be sure to send the full buffer in one urb */ 262#define DIGI_OUT_BUF_SIZE 8 263 264/* port input buffer length -- must be >= transfer buffer length - 3 */ 265/* so we can be sure to hold at least one full buffer from one urb */ 266#define DIGI_IN_BUF_SIZE 64 267 268/* retry timeout while sleeping */ 269#define DIGI_RETRY_TIMEOUT (HZ/10) 270 271/* timeout while waiting for tty output to drain in close */ 272/* this delay is used twice in close, so the total delay could */ 273/* be twice this value */ 274#define DIGI_CLOSE_TIMEOUT (5*HZ) 275 276 277/* AccelePort USB Defines */ 278 279/* ids */ 280#define DIGI_VENDOR_ID 0x05c5 281#define DIGI_2_ID 0x0002 /* USB-2 */ 282#define DIGI_4_ID 0x0004 /* USB-4 */ 283 284/* commands 285 * "INB": can be used on the in-band endpoint 286 * "OOB": can be used on the out-of-band endpoint 287 */ 288#define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 289#define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 290#define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 291#define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 292#define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 293#define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 294#define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 295#define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 296#define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 297#define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 298#define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 299#define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 300#define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 301#define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 302#define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 303#define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 304#define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 305#define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 306#define DIGI_CMD_SEND_DATA 18 /* INB */ 307#define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 308#define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 309#define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 310 311/* baud rates */ 312#define DIGI_BAUD_50 0 313#define DIGI_BAUD_75 1 314#define DIGI_BAUD_110 2 315#define DIGI_BAUD_150 3 316#define DIGI_BAUD_200 4 317#define DIGI_BAUD_300 5 318#define DIGI_BAUD_600 6 319#define DIGI_BAUD_1200 7 320#define DIGI_BAUD_1800 8 321#define DIGI_BAUD_2400 9 322#define DIGI_BAUD_4800 10 323#define DIGI_BAUD_7200 11 324#define DIGI_BAUD_9600 12 325#define DIGI_BAUD_14400 13 326#define DIGI_BAUD_19200 14 327#define DIGI_BAUD_28800 15 328#define DIGI_BAUD_38400 16 329#define DIGI_BAUD_57600 17 330#define DIGI_BAUD_76800 18 331#define DIGI_BAUD_115200 19 332#define DIGI_BAUD_153600 20 333#define DIGI_BAUD_230400 21 334#define DIGI_BAUD_460800 22 335 336/* arguments */ 337#define DIGI_WORD_SIZE_5 0 338#define DIGI_WORD_SIZE_6 1 339#define DIGI_WORD_SIZE_7 2 340#define DIGI_WORD_SIZE_8 3 341 342#define DIGI_PARITY_NONE 0 343#define DIGI_PARITY_ODD 1 344#define DIGI_PARITY_EVEN 2 345#define DIGI_PARITY_MARK 3 346#define DIGI_PARITY_SPACE 4 347 348#define DIGI_STOP_BITS_1 0 349#define DIGI_STOP_BITS_2 1 350 351#define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 352#define DIGI_INPUT_FLOW_CONTROL_RTS 2 353#define DIGI_INPUT_FLOW_CONTROL_DTR 4 354 355#define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 356#define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 357#define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 358 359#define DIGI_DTR_INACTIVE 0 360#define DIGI_DTR_ACTIVE 1 361#define DIGI_DTR_INPUT_FLOW_CONTROL 2 362 363#define DIGI_RTS_INACTIVE 0 364#define DIGI_RTS_ACTIVE 1 365#define DIGI_RTS_INPUT_FLOW_CONTROL 2 366#define DIGI_RTS_TOGGLE 3 367 368#define DIGI_FLUSH_TX 1 369#define DIGI_FLUSH_RX 2 370#define DIGI_RESUME_TX 4 /* clears xoff condition */ 371 372#define DIGI_TRANSMIT_NOT_IDLE 0 373#define DIGI_TRANSMIT_IDLE 1 374 375#define DIGI_DISABLE 0 376#define DIGI_ENABLE 1 377 378#define DIGI_DEASSERT 0 379#define DIGI_ASSERT 1 380 381/* in band status codes */ 382#define DIGI_OVERRUN_ERROR 4 383#define DIGI_PARITY_ERROR 8 384#define DIGI_FRAMING_ERROR 16 385#define DIGI_BREAK_ERROR 32 386 387/* out of band status */ 388#define DIGI_NO_ERROR 0 389#define DIGI_BAD_FIRST_PARAMETER 1 390#define DIGI_BAD_SECOND_PARAMETER 2 391#define DIGI_INVALID_LINE 3 392#define DIGI_INVALID_OPCODE 4 393 394/* input signals */ 395#define DIGI_READ_INPUT_SIGNALS_SLOT 1 396#define DIGI_READ_INPUT_SIGNALS_ERR 2 397#define DIGI_READ_INPUT_SIGNALS_BUSY 4 398#define DIGI_READ_INPUT_SIGNALS_PE 8 399#define DIGI_READ_INPUT_SIGNALS_CTS 16 400#define DIGI_READ_INPUT_SIGNALS_DSR 32 401#define DIGI_READ_INPUT_SIGNALS_RI 64 402#define DIGI_READ_INPUT_SIGNALS_DCD 128 403 404 405/* Structures */ 406 407struct digi_serial { 408 spinlock_t ds_serial_lock; 409 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 410 int ds_oob_port_num; /* index of out-of-band port */ 411 int ds_device_started; 412}; 413 414struct digi_port { 415 spinlock_t dp_port_lock; 416 int dp_port_num; 417 int dp_out_buf_len; 418 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 419 int dp_in_buf_len; 420 unsigned char dp_in_buf[DIGI_IN_BUF_SIZE]; 421 unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE]; 422 int dp_write_urb_in_use; 423 unsigned int dp_modem_signals; 424 wait_queue_head_t dp_modem_change_wait; 425 int dp_transmit_idle; 426 wait_queue_head_t dp_transmit_idle_wait; 427 int dp_throttled; 428 int dp_throttle_restart; 429 wait_queue_head_t dp_flush_wait; 430 int dp_in_close; /* close in progress */ 431 wait_queue_head_t dp_close_wait; /* wait queue for close */ 432 struct work_struct dp_wakeup_work; 433 struct usb_serial_port *dp_port; 434}; 435 436 437/* Local Function Declarations */ 438 439static void digi_wakeup_write( struct usb_serial_port *port ); 440static void digi_wakeup_write_lock(struct work_struct *work); 441static int digi_write_oob_command( struct usb_serial_port *port, 442 unsigned char *buf, int count, int interruptible ); 443static int digi_write_inb_command( struct usb_serial_port *port, 444 unsigned char *buf, int count, unsigned long timeout ); 445static int digi_set_modem_signals( struct usb_serial_port *port, 446 unsigned int modem_signals, int interruptible ); 447static int digi_transmit_idle( struct usb_serial_port *port, 448 unsigned long timeout ); 449static void digi_rx_throttle (struct usb_serial_port *port); 450static void digi_rx_unthrottle (struct usb_serial_port *port); 451static void digi_set_termios( struct usb_serial_port *port, 452 struct ktermios *old_termios ); 453static void digi_break_ctl( struct usb_serial_port *port, int break_state ); 454static int digi_ioctl( struct usb_serial_port *port, struct file *file, 455 unsigned int cmd, unsigned long arg ); 456static int digi_tiocmget( struct usb_serial_port *port, struct file *file ); 457static int digi_tiocmset( struct usb_serial_port *port, struct file *file, 458 unsigned int set, unsigned int clear ); 459static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ); 460static void digi_write_bulk_callback( struct urb *urb ); 461static int digi_write_room( struct usb_serial_port *port ); 462static int digi_chars_in_buffer( struct usb_serial_port *port ); 463static int digi_open( struct usb_serial_port *port, struct file *filp ); 464static void digi_close( struct usb_serial_port *port, struct file *filp ); 465static int digi_startup_device( struct usb_serial *serial ); 466static int digi_startup( struct usb_serial *serial ); 467static void digi_shutdown( struct usb_serial *serial ); 468static void digi_read_bulk_callback( struct urb *urb ); 469static int digi_read_inb_callback( struct urb *urb ); 470static int digi_read_oob_callback( struct urb *urb ); 471 472 473/* Statics */ 474 475static int debug; 476 477static struct usb_device_id id_table_combined [] = { 478 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 479 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 480 { } /* Terminating entry */ 481}; 482 483static struct usb_device_id id_table_2 [] = { 484 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 485 { } /* Terminating entry */ 486}; 487 488static struct usb_device_id id_table_4 [] = { 489 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 490 { } /* Terminating entry */ 491}; 492 493MODULE_DEVICE_TABLE (usb, id_table_combined); 494 495static struct usb_driver digi_driver = { 496 .name = "digi_acceleport", 497 .probe = usb_serial_probe, 498 .disconnect = usb_serial_disconnect, 499 .id_table = id_table_combined, 500 .no_dynamic_id = 1, 501}; 502 503 504/* device info needed for the Digi serial converter */ 505 506static struct usb_serial_driver digi_acceleport_2_device = { 507 .driver = { 508 .owner = THIS_MODULE, 509 .name = "digi_2", 510 }, 511 .description = "Digi 2 port USB adapter", 512 .usb_driver = &digi_driver, 513 .id_table = id_table_2, 514 .num_interrupt_in = 0, 515 .num_bulk_in = 4, 516 .num_bulk_out = 4, 517 .num_ports = 3, 518 .open = digi_open, 519 .close = digi_close, 520 .write = digi_write, 521 .write_room = digi_write_room, 522 .write_bulk_callback = digi_write_bulk_callback, 523 .read_bulk_callback = digi_read_bulk_callback, 524 .chars_in_buffer = digi_chars_in_buffer, 525 .throttle = digi_rx_throttle, 526 .unthrottle = digi_rx_unthrottle, 527 .ioctl = digi_ioctl, 528 .set_termios = digi_set_termios, 529 .break_ctl = digi_break_ctl, 530 .tiocmget = digi_tiocmget, 531 .tiocmset = digi_tiocmset, 532 .attach = digi_startup, 533 .shutdown = digi_shutdown, 534}; 535 536static struct usb_serial_driver digi_acceleport_4_device = { 537 .driver = { 538 .owner = THIS_MODULE, 539 .name = "digi_4", 540 }, 541 .description = "Digi 4 port USB adapter", 542 .usb_driver = &digi_driver, 543 .id_table = id_table_4, 544 .num_interrupt_in = 0, 545 .num_bulk_in = 5, 546 .num_bulk_out = 5, 547 .num_ports = 4, 548 .open = digi_open, 549 .close = digi_close, 550 .write = digi_write, 551 .write_room = digi_write_room, 552 .write_bulk_callback = digi_write_bulk_callback, 553 .read_bulk_callback = digi_read_bulk_callback, 554 .chars_in_buffer = digi_chars_in_buffer, 555 .throttle = digi_rx_throttle, 556 .unthrottle = digi_rx_unthrottle, 557 .ioctl = digi_ioctl, 558 .set_termios = digi_set_termios, 559 .break_ctl = digi_break_ctl, 560 .tiocmget = digi_tiocmget, 561 .tiocmset = digi_tiocmset, 562 .attach = digi_startup, 563 .shutdown = digi_shutdown, 564}; 565 566 567/* Functions */ 568 569/* 570* Cond Wait Interruptible Timeout Irqrestore 571* 572* Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 573* so that wake ups are not lost if they occur between the unlock 574* and the sleep. In other words, spin_unlock_irqrestore and 575* interruptible_sleep_on_timeout are "atomic" with respect to 576* wake ups. This is used to implement condition variables. 577* 578* interruptible_sleep_on_timeout is deprecated and has been replaced 579* with the equivalent code. 580*/ 581 582static inline long cond_wait_interruptible_timeout_irqrestore( 583 wait_queue_head_t *q, long timeout, 584 spinlock_t *lock, unsigned long flags ) 585{ 586 DEFINE_WAIT(wait); 587 588 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 589 spin_unlock_irqrestore(lock, flags); 590 timeout = schedule_timeout(timeout); 591 finish_wait(q, &wait); 592 593 return timeout; 594} 595 596 597/* 598* Digi Wakeup Write 599* 600* Wake up port, line discipline, and tty processes sleeping 601* on writes. 602*/ 603 604static void digi_wakeup_write_lock(struct work_struct *work) 605{ 606 struct digi_port *priv = 607 container_of(work, struct digi_port, dp_wakeup_work); 608 struct usb_serial_port *port = priv->dp_port; 609 unsigned long flags; 610 611 612 spin_lock_irqsave( &priv->dp_port_lock, flags ); 613 digi_wakeup_write( port ); 614 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 615} 616 617static void digi_wakeup_write( struct usb_serial_port *port ) 618{ 619 tty_wakeup(port->tty); 620} 621 622 623/* 624* Digi Write OOB Command 625* 626* Write commands on the out of band port. Commands are 4 627* bytes each, multiple commands can be sent at once, and 628* no command will be split across USB packets. Returns 0 629* if successful, -EINTR if interrupted while sleeping and 630* the interruptible flag is true, or a negative error 631* returned by usb_submit_urb. 632*/ 633 634static int digi_write_oob_command( struct usb_serial_port *port, 635 unsigned char *buf, int count, int interruptible ) 636{ 637 638 int ret = 0; 639 int len; 640 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 641 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 642 unsigned long flags = 0; 643 644 645dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count ); 646 647 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 648 649 while( count > 0 ) { 650 651 while( oob_port->write_urb->status == -EINPROGRESS 652 || oob_priv->dp_write_urb_in_use ) { 653 cond_wait_interruptible_timeout_irqrestore( 654 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 655 &oob_priv->dp_port_lock, flags ); 656 if( interruptible && signal_pending(current) ) { 657 return( -EINTR ); 658 } 659 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 660 } 661 662 /* len must be a multiple of 4, so commands are not split */ 663 len = min(count, oob_port->bulk_out_size ); 664 if( len > 4 ) 665 len &= ~3; 666 667 memcpy( oob_port->write_urb->transfer_buffer, buf, len ); 668 oob_port->write_urb->transfer_buffer_length = len; 669 oob_port->write_urb->dev = port->serial->dev; 670 671 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 672 oob_priv->dp_write_urb_in_use = 1; 673 count -= len; 674 buf += len; 675 } 676 677 } 678 679 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 680 681 if( ret ) { 682 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 683 ret ); 684 } 685 686 return( ret ); 687 688} 689 690 691/* 692* Digi Write In Band Command 693* 694* Write commands on the given port. Commands are 4 695* bytes each, multiple commands can be sent at once, and 696* no command will be split across USB packets. If timeout 697* is non-zero, write in band command will return after 698* waiting unsuccessfully for the URB status to clear for 699* timeout ticks. Returns 0 if successful, or a negative 700* error returned by digi_write. 701*/ 702 703static int digi_write_inb_command( struct usb_serial_port *port, 704 unsigned char *buf, int count, unsigned long timeout ) 705{ 706 707 int ret = 0; 708 int len; 709 struct digi_port *priv = usb_get_serial_port_data(port); 710 unsigned char *data = port->write_urb->transfer_buffer; 711 unsigned long flags = 0; 712 713 714dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num, 715count ); 716 717 if( timeout ) 718 timeout += jiffies; 719 else 720 timeout = ULONG_MAX; 721 722 spin_lock_irqsave( &priv->dp_port_lock, flags ); 723 724 while( count > 0 && ret == 0 ) { 725 726 while( (port->write_urb->status == -EINPROGRESS 727 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) { 728 cond_wait_interruptible_timeout_irqrestore( 729 &port->write_wait, DIGI_RETRY_TIMEOUT, 730 &priv->dp_port_lock, flags ); 731 if( signal_pending(current) ) { 732 return( -EINTR ); 733 } 734 spin_lock_irqsave( &priv->dp_port_lock, flags ); 735 } 736 737 /* len must be a multiple of 4 and small enough to */ 738 /* guarantee the write will send buffered data first, */ 739 /* so commands are in order with data and not split */ 740 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len ); 741 if( len > 4 ) 742 len &= ~3; 743 744 /* write any buffered data first */ 745 if( priv->dp_out_buf_len > 0 ) { 746 data[0] = DIGI_CMD_SEND_DATA; 747 data[1] = priv->dp_out_buf_len; 748 memcpy( data+2, priv->dp_out_buf, 749 priv->dp_out_buf_len ); 750 memcpy( data+2+priv->dp_out_buf_len, buf, len ); 751 port->write_urb->transfer_buffer_length 752 = priv->dp_out_buf_len+2+len; 753 } else { 754 memcpy( data, buf, len ); 755 port->write_urb->transfer_buffer_length = len; 756 } 757 port->write_urb->dev = port->serial->dev; 758 759 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 760 priv->dp_write_urb_in_use = 1; 761 priv->dp_out_buf_len = 0; 762 count -= len; 763 buf += len; 764 } 765 766 } 767 768 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 769 770 if( ret ) { 771 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 772 ret, priv->dp_port_num ); 773 } 774 775 return( ret ); 776 777} 778 779 780/* 781* Digi Set Modem Signals 782* 783* Sets or clears DTR and RTS on the port, according to the 784* modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 785* for the modem_signals argument. Returns 0 if successful, 786* -EINTR if interrupted while sleeping, or a non-zero error 787* returned by usb_submit_urb. 788*/ 789 790static int digi_set_modem_signals( struct usb_serial_port *port, 791 unsigned int modem_signals, int interruptible ) 792{ 793 794 int ret; 795 struct digi_port *port_priv = usb_get_serial_port_data(port); 796 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 797 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 798 unsigned char *data = oob_port->write_urb->transfer_buffer; 799 unsigned long flags = 0; 800 801 802dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", 803port_priv->dp_port_num, modem_signals ); 804 805 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 806 spin_lock( &port_priv->dp_port_lock ); 807 808 while( oob_port->write_urb->status == -EINPROGRESS 809 || oob_priv->dp_write_urb_in_use ) { 810 spin_unlock( &port_priv->dp_port_lock ); 811 cond_wait_interruptible_timeout_irqrestore( 812 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 813 &oob_priv->dp_port_lock, flags ); 814 if( interruptible && signal_pending(current) ) { 815 return( -EINTR ); 816 } 817 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 818 spin_lock( &port_priv->dp_port_lock ); 819 } 820 821 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 822 data[1] = port_priv->dp_port_num; 823 data[2] = (modem_signals&TIOCM_DTR) ? 824 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 825 data[3] = 0; 826 827 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 828 data[5] = port_priv->dp_port_num; 829 data[6] = (modem_signals&TIOCM_RTS) ? 830 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 831 data[7] = 0; 832 833 oob_port->write_urb->transfer_buffer_length = 8; 834 oob_port->write_urb->dev = port->serial->dev; 835 836 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 837 oob_priv->dp_write_urb_in_use = 1; 838 port_priv->dp_modem_signals = 839 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 840 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 841 } 842 843 spin_unlock( &port_priv->dp_port_lock ); 844 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 845 846 if( ret ) { 847 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 848 ret ); 849 } 850 851 return( ret ); 852 853} 854 855 856/* 857* Digi Transmit Idle 858* 859* Digi transmit idle waits, up to timeout ticks, for the transmitter 860* to go idle. It returns 0 if successful or a negative error. 861* 862* There are race conditions here if more than one process is calling 863* digi_transmit_idle on the same port at the same time. However, this 864* is only called from close, and only one process can be in close on a 865* port at a time, so its ok. 866*/ 867 868static int digi_transmit_idle( struct usb_serial_port *port, 869 unsigned long timeout ) 870{ 871 872 int ret; 873 unsigned char buf[2]; 874 struct digi_port *priv = usb_get_serial_port_data(port); 875 unsigned long flags = 0; 876 877 878 spin_lock_irqsave( &priv->dp_port_lock, flags ); 879 priv->dp_transmit_idle = 0; 880 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 881 882 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 883 buf[1] = 0; 884 885 timeout += jiffies; 886 887 if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 ) 888 return( ret ); 889 890 spin_lock_irqsave( &priv->dp_port_lock, flags ); 891 892 while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) { 893 cond_wait_interruptible_timeout_irqrestore( 894 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 895 &priv->dp_port_lock, flags ); 896 if( signal_pending(current) ) { 897 return( -EINTR ); 898 } 899 spin_lock_irqsave( &priv->dp_port_lock, flags ); 900 } 901 902 priv->dp_transmit_idle = 0; 903 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 904 905 return( 0 ); 906 907} 908 909 910static void digi_rx_throttle( struct usb_serial_port *port ) 911{ 912 913 unsigned long flags; 914 struct digi_port *priv = usb_get_serial_port_data(port); 915 916 917dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num ); 918 919 /* stop receiving characters by not resubmitting the read urb */ 920 spin_lock_irqsave( &priv->dp_port_lock, flags ); 921 priv->dp_throttled = 1; 922 priv->dp_throttle_restart = 0; 923 priv->dp_in_buf_len = 0; 924 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 925 926} 927 928 929static void digi_rx_unthrottle( struct usb_serial_port *port ) 930{ 931 932 int ret = 0; 933 int len; 934 unsigned long flags; 935 struct digi_port *priv = usb_get_serial_port_data(port); 936 struct tty_struct *tty = port->tty; 937 938 939dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num ); 940 941 spin_lock_irqsave( &priv->dp_port_lock, flags ); 942 943 /* send any buffered chars from throttle time on to tty subsystem */ 944 945 len = tty_buffer_request_room(tty, priv->dp_in_buf_len); 946 if( len > 0 ) { 947 tty_insert_flip_string_flags(tty, priv->dp_in_buf, priv->dp_in_flag_buf, len); 948 tty_flip_buffer_push( tty ); 949 } 950 951 /* restart read chain */ 952 if( priv->dp_throttle_restart ) { 953 port->read_urb->dev = port->serial->dev; 954 ret = usb_submit_urb( port->read_urb, GFP_ATOMIC ); 955 } 956 957 /* turn throttle off */ 958 priv->dp_throttled = 0; 959 priv->dp_in_buf_len = 0; 960 priv->dp_throttle_restart = 0; 961 962 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 963 964 if( ret ) { 965 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 966 ret, priv->dp_port_num ); 967 } 968 969} 970 971 972static void digi_set_termios( struct usb_serial_port *port, 973 struct ktermios *old_termios ) 974{ 975 976 struct digi_port *priv = usb_get_serial_port_data(port); 977 unsigned int iflag = port->tty->termios->c_iflag; 978 unsigned int cflag = port->tty->termios->c_cflag; 979 unsigned int old_iflag = old_termios->c_iflag; 980 unsigned int old_cflag = old_termios->c_cflag; 981 unsigned char buf[32]; 982 unsigned int modem_signals; 983 int arg,ret; 984 int i = 0; 985 986 987dbg( "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 ); 988 989 /* set baud rate */ 990 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) { 991 992 arg = -1; 993 994 /* reassert DTR and (maybe) RTS on transition from B0 */ 995 if( (old_cflag&CBAUD) == B0 ) { 996 /* don't set RTS if using hardware flow control */ 997 /* and throttling input */ 998 modem_signals = TIOCM_DTR; 999 if( !(port->tty->termios->c_cflag & CRTSCTS) || 1000 !test_bit(TTY_THROTTLED, &port->tty->flags) ) { 1001 modem_signals |= TIOCM_RTS; 1002 } 1003 digi_set_modem_signals( port, modem_signals, 1 ); 1004 } 1005 1006 switch( (cflag&CBAUD) ) { 1007 /* drop DTR and RTS on transition to B0 */ 1008 case B0: digi_set_modem_signals( port, 0, 1 ); break; 1009 case B50: arg = DIGI_BAUD_50; break; 1010 case B75: arg = DIGI_BAUD_75; break; 1011 case B110: arg = DIGI_BAUD_110; break; 1012 case B150: arg = DIGI_BAUD_150; break; 1013 case B200: arg = DIGI_BAUD_200; break; 1014 case B300: arg = DIGI_BAUD_300; break; 1015 case B600: arg = DIGI_BAUD_600; break; 1016 case B1200: arg = DIGI_BAUD_1200; break; 1017 case B1800: arg = DIGI_BAUD_1800; break; 1018 case B2400: arg = DIGI_BAUD_2400; break; 1019 case B4800: arg = DIGI_BAUD_4800; break; 1020 case B9600: arg = DIGI_BAUD_9600; break; 1021 case B19200: arg = DIGI_BAUD_19200; break; 1022 case B38400: arg = DIGI_BAUD_38400; break; 1023 case B57600: arg = DIGI_BAUD_57600; break; 1024 case B115200: arg = DIGI_BAUD_115200; break; 1025 case B230400: arg = DIGI_BAUD_230400; break; 1026 case B460800: arg = DIGI_BAUD_460800; break; 1027 default: 1028 dbg( "digi_set_termios: can't handle baud rate 0x%x", 1029 (cflag&CBAUD) ); 1030 break; 1031 } 1032 1033 if( arg != -1 ) { 1034 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 1035 buf[i++] = priv->dp_port_num; 1036 buf[i++] = arg; 1037 buf[i++] = 0; 1038 } 1039 1040 } 1041 1042 /* set parity */ 1043 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) { 1044 1045 if( (cflag&PARENB) ) { 1046 if( (cflag&PARODD) ) 1047 arg = DIGI_PARITY_ODD; 1048 else 1049 arg = DIGI_PARITY_EVEN; 1050 } else { 1051 arg = DIGI_PARITY_NONE; 1052 } 1053 1054 buf[i++] = DIGI_CMD_SET_PARITY; 1055 buf[i++] = priv->dp_port_num; 1056 buf[i++] = arg; 1057 buf[i++] = 0; 1058 1059 } 1060 1061 /* set word size */ 1062 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) { 1063 1064 arg = -1; 1065 1066 switch( (cflag&CSIZE) ) { 1067 case CS5: arg = DIGI_WORD_SIZE_5; break; 1068 case CS6: arg = DIGI_WORD_SIZE_6; break; 1069 case CS7: arg = DIGI_WORD_SIZE_7; break; 1070 case CS8: arg = DIGI_WORD_SIZE_8; break; 1071 default: 1072 dbg( "digi_set_termios: can't handle word size %d", 1073 (cflag&CSIZE) ); 1074 break; 1075 } 1076 1077 if( arg != -1 ) { 1078 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 1079 buf[i++] = priv->dp_port_num; 1080 buf[i++] = arg; 1081 buf[i++] = 0; 1082 } 1083 1084 } 1085 1086 /* set stop bits */ 1087 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) { 1088 1089 if( (cflag&CSTOPB) ) 1090 arg = DIGI_STOP_BITS_2; 1091 else 1092 arg = DIGI_STOP_BITS_1; 1093 1094 buf[i++] = DIGI_CMD_SET_STOP_BITS; 1095 buf[i++] = priv->dp_port_num; 1096 buf[i++] = arg; 1097 buf[i++] = 0; 1098 1099 } 1100 1101 /* set input flow control */ 1102 if( (iflag&IXOFF) != (old_iflag&IXOFF) 1103 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1104 1105 arg = 0; 1106 1107 if( (iflag&IXOFF) ) 1108 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1109 else 1110 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1111 1112 if( (cflag&CRTSCTS) ) { 1113 1114 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 1115 1116 /* On USB-4 it is necessary to assert RTS prior */ 1117 /* to selecting RTS input flow control. */ 1118 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 1119 buf[i++] = priv->dp_port_num; 1120 buf[i++] = DIGI_RTS_ACTIVE; 1121 buf[i++] = 0; 1122 1123 } else { 1124 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 1125 } 1126 1127 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1128 buf[i++] = priv->dp_port_num; 1129 buf[i++] = arg; 1130 buf[i++] = 0; 1131 1132 } 1133 1134 /* set output flow control */ 1135 if( (iflag&IXON) != (old_iflag&IXON) 1136 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1137 1138 arg = 0; 1139 1140 if( (iflag&IXON) ) 1141 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1142 else 1143 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1144 1145 if( (cflag&CRTSCTS) ) { 1146 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 1147 } else { 1148 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 1149 port->tty->hw_stopped = 0; 1150 } 1151 1152 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1153 buf[i++] = priv->dp_port_num; 1154 buf[i++] = arg; 1155 buf[i++] = 0; 1156 1157 } 1158 1159 /* set receive enable/disable */ 1160 if( (cflag&CREAD) != (old_cflag&CREAD) ) { 1161 1162 if( (cflag&CREAD) ) 1163 arg = DIGI_ENABLE; 1164 else 1165 arg = DIGI_DISABLE; 1166 1167 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 1168 buf[i++] = priv->dp_port_num; 1169 buf[i++] = arg; 1170 buf[i++] = 0; 1171 1172 } 1173 1174 if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 ) 1175 dbg( "digi_set_termios: write oob failed, ret=%d", ret ); 1176 1177} 1178 1179 1180static void digi_break_ctl( struct usb_serial_port *port, int break_state ) 1181{ 1182 1183 unsigned char buf[4]; 1184 1185 1186 buf[0] = DIGI_CMD_BREAK_CONTROL; 1187 buf[1] = 2; /* length */ 1188 buf[2] = break_state ? 1 : 0; 1189 buf[3] = 0; /* pad */ 1190 1191 digi_write_inb_command( port, buf, 4, 0 ); 1192 1193} 1194 1195 1196static int digi_tiocmget( struct usb_serial_port *port, struct file *file ) 1197{ 1198 struct digi_port *priv = usb_get_serial_port_data(port); 1199 unsigned int val; 1200 unsigned long flags; 1201 1202 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1203 1204 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1205 val = priv->dp_modem_signals; 1206 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1207 return val; 1208} 1209 1210 1211static int digi_tiocmset( struct usb_serial_port *port, struct file *file, 1212 unsigned int set, unsigned int clear ) 1213{ 1214 struct digi_port *priv = usb_get_serial_port_data(port); 1215 unsigned int val; 1216 unsigned long flags; 1217 1218 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1219 1220 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1221 val = (priv->dp_modem_signals & ~clear) | set; 1222 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1223 return digi_set_modem_signals( port, val, 1 ); 1224} 1225 1226 1227static int digi_ioctl( struct usb_serial_port *port, struct file *file, 1228 unsigned int cmd, unsigned long arg ) 1229{ 1230 1231 struct digi_port *priv = usb_get_serial_port_data(port); 1232 1233dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd ); 1234 1235 switch (cmd) { 1236 1237 case TIOCMIWAIT: 1238 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/ 1239 /* TODO */ 1240 return( 0 ); 1241 1242 case TIOCGICOUNT: 1243 /* return count of modemline transitions */ 1244 /* TODO */ 1245 return 0; 1246 1247 } 1248 1249 return( -ENOIOCTLCMD ); 1250 1251} 1252 1253 1254static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ) 1255{ 1256 1257 int ret,data_len,new_len; 1258 struct digi_port *priv = usb_get_serial_port_data(port); 1259 unsigned char *data = port->write_urb->transfer_buffer; 1260 unsigned long flags = 0; 1261 1262 1263dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", 1264priv->dp_port_num, count, in_interrupt() ); 1265 1266 /* copy user data (which can sleep) before getting spin lock */ 1267 count = min( count, port->bulk_out_size-2 ); 1268 count = min( 64, count); 1269 1270 /* be sure only one write proceeds at a time */ 1271 /* there are races on the port private buffer */ 1272 /* and races to check write_urb->status */ 1273 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1274 1275 /* wait for urb status clear to submit another urb */ 1276 if( port->write_urb->status == -EINPROGRESS 1277 || priv->dp_write_urb_in_use ) { 1278 1279 /* buffer data if count is 1 (probably put_char) if possible */ 1280 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) { 1281 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 1282 new_len = 1; 1283 } else { 1284 new_len = 0; 1285 } 1286 1287 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1288 1289 return( new_len ); 1290 1291 } 1292 1293 /* allow space for any buffered data and for new data, up to */ 1294 /* transfer buffer size - 2 (for command and length bytes) */ 1295 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 1296 data_len = new_len + priv->dp_out_buf_len; 1297 1298 if( data_len == 0 ) { 1299 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1300 return( 0 ); 1301 } 1302 1303 port->write_urb->transfer_buffer_length = data_len+2; 1304 port->write_urb->dev = port->serial->dev; 1305 1306 *data++ = DIGI_CMD_SEND_DATA; 1307 *data++ = data_len; 1308 1309 /* copy in buffered data first */ 1310 memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len ); 1311 data += priv->dp_out_buf_len; 1312 1313 /* copy in new data */ 1314 memcpy( data, buf, new_len ); 1315 1316 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1317 priv->dp_write_urb_in_use = 1; 1318 ret = new_len; 1319 priv->dp_out_buf_len = 0; 1320 } 1321 1322 /* return length of new data written, or error */ 1323 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1324 if( ret < 0 ) { 1325 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1326 ret, priv->dp_port_num ); 1327 } 1328 1329dbg( "digi_write: returning %d", ret ); 1330 return( ret ); 1331 1332} 1333 1334 1335static void digi_write_bulk_callback( struct urb *urb ) 1336{ 1337 1338 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1339 struct usb_serial *serial; 1340 struct digi_port *priv; 1341 struct digi_serial *serial_priv; 1342 int ret = 0; 1343 1344 1345dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status ); 1346 1347 /* port and serial sanity check */ 1348 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1349 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1350 urb->status ); 1351 return; 1352 } 1353 serial = port->serial; 1354 if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) { 1355 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1356 return; 1357 } 1358 1359 /* handle oob callback */ 1360 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1361 dbg( "digi_write_bulk_callback: oob callback" ); 1362 spin_lock( &priv->dp_port_lock ); 1363 priv->dp_write_urb_in_use = 0; 1364 wake_up_interruptible( &port->write_wait ); 1365 spin_unlock( &priv->dp_port_lock ); 1366 return; 1367 } 1368 1369 /* try to send any buffered data on this port, if it is open */ 1370 spin_lock( &priv->dp_port_lock ); 1371 priv->dp_write_urb_in_use = 0; 1372 if( port->open_count && port->write_urb->status != -EINPROGRESS 1373 && priv->dp_out_buf_len > 0 ) { 1374 1375 *((unsigned char *)(port->write_urb->transfer_buffer)) 1376 = (unsigned char)DIGI_CMD_SEND_DATA; 1377 *((unsigned char *)(port->write_urb->transfer_buffer)+1) 1378 = (unsigned char)priv->dp_out_buf_len; 1379 1380 port->write_urb->transfer_buffer_length 1381 = priv->dp_out_buf_len+2; 1382 port->write_urb->dev = serial->dev; 1383 1384 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf, 1385 priv->dp_out_buf_len ); 1386 1387 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1388 priv->dp_write_urb_in_use = 1; 1389 priv->dp_out_buf_len = 0; 1390 } 1391 1392 } 1393 1394 /* wake up processes sleeping on writes immediately */ 1395 digi_wakeup_write( port ); 1396 1397 /* also queue up a wakeup at scheduler time, in case we */ 1398 /* lost the race in write_chan(). */ 1399 schedule_work(&priv->dp_wakeup_work); 1400 1401 spin_unlock( &priv->dp_port_lock ); 1402 1403 if( ret ) { 1404 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1405 ret, priv->dp_port_num ); 1406 } 1407 1408} 1409 1410 1411static int digi_write_room( struct usb_serial_port *port ) 1412{ 1413 1414 int room; 1415 struct digi_port *priv = usb_get_serial_port_data(port); 1416 unsigned long flags = 0; 1417 1418 1419 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1420 1421 if( port->write_urb->status == -EINPROGRESS 1422 || priv->dp_write_urb_in_use ) 1423 room = 0; 1424 else 1425 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1426 1427 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1428 1429dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room ); 1430 return( room ); 1431 1432} 1433 1434 1435static int digi_chars_in_buffer( struct usb_serial_port *port ) 1436{ 1437 1438 struct digi_port *priv = usb_get_serial_port_data(port); 1439 1440 1441 if( port->write_urb->status == -EINPROGRESS 1442 || priv->dp_write_urb_in_use ) { 1443dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 ); 1444 /* return( port->bulk_out_size - 2 ); */ 1445 return( 256 ); 1446 } else { 1447dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len ); 1448 return( priv->dp_out_buf_len ); 1449 } 1450 1451} 1452 1453 1454static int digi_open( struct usb_serial_port *port, struct file *filp ) 1455{ 1456 1457 int ret; 1458 unsigned char buf[32]; 1459 struct digi_port *priv = usb_get_serial_port_data(port); 1460 struct ktermios not_termios; 1461 unsigned long flags = 0; 1462 1463 1464dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1465 1466 /* be sure the device is started up */ 1467 if( digi_startup_device( port->serial ) != 0 ) 1468 return( -ENXIO ); 1469 1470 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1471 1472 /* don't wait on a close in progress for non-blocking opens */ 1473 if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1474 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1475 return( -EAGAIN ); 1476 } 1477 1478 /* wait for a close in progress to finish */ 1479 while( priv->dp_in_close ) { 1480 cond_wait_interruptible_timeout_irqrestore( 1481 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT, 1482 &priv->dp_port_lock, flags ); 1483 if( signal_pending(current) ) { 1484 return( -EINTR ); 1485 } 1486 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1487 } 1488 1489 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1490 1491 /* read modem signals automatically whenever they change */ 1492 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1493 buf[1] = priv->dp_port_num; 1494 buf[2] = DIGI_ENABLE; 1495 buf[3] = 0; 1496 1497 /* flush fifos */ 1498 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1499 buf[5] = priv->dp_port_num; 1500 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1501 buf[7] = 0; 1502 1503 if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 ) 1504 dbg( "digi_open: write oob failed, ret=%d", ret ); 1505 1506 /* set termios settings */ 1507 not_termios.c_cflag = ~port->tty->termios->c_cflag; 1508 not_termios.c_iflag = ~port->tty->termios->c_iflag; 1509 digi_set_termios( port, ¬_termios ); 1510 1511 /* set DTR and RTS */ 1512 digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 ); 1513 1514 return( 0 ); 1515 1516} 1517 1518 1519static void digi_close( struct usb_serial_port *port, struct file *filp ) 1520{ 1521 DEFINE_WAIT(wait); 1522 int ret; 1523 unsigned char buf[32]; 1524 struct tty_struct *tty = port->tty; 1525 struct digi_port *priv = usb_get_serial_port_data(port); 1526 unsigned long flags = 0; 1527 1528 1529dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1530 1531 1532 /* if disconnected, just clear flags */ 1533 if (!usb_get_intfdata(port->serial->interface)) 1534 goto exit; 1535 1536 /* do cleanup only after final close on this port */ 1537 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1538 priv->dp_in_close = 1; 1539 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1540 1541 /* tell line discipline to process only XON/XOFF */ 1542 tty->closing = 1; 1543 1544 /* wait for output to drain */ 1545 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1546 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT ); 1547 } 1548 1549 /* flush driver and line discipline buffers */ 1550 if( tty->driver->flush_buffer ) 1551 tty->driver->flush_buffer( tty ); 1552 tty_ldisc_flush(tty); 1553 1554 if (port->serial->dev) { 1555 /* wait for transmit idle */ 1556 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1557 digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT ); 1558 } 1559 1560 /* drop DTR and RTS */ 1561 digi_set_modem_signals( port, 0, 0 ); 1562 1563 /* disable input flow control */ 1564 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1565 buf[1] = priv->dp_port_num; 1566 buf[2] = DIGI_DISABLE; 1567 buf[3] = 0; 1568 1569 /* disable output flow control */ 1570 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1571 buf[5] = priv->dp_port_num; 1572 buf[6] = DIGI_DISABLE; 1573 buf[7] = 0; 1574 1575 /* disable reading modem signals automatically */ 1576 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1577 buf[9] = priv->dp_port_num; 1578 buf[10] = DIGI_DISABLE; 1579 buf[11] = 0; 1580 1581 /* disable receive */ 1582 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1583 buf[13] = priv->dp_port_num; 1584 buf[14] = DIGI_DISABLE; 1585 buf[15] = 0; 1586 1587 /* flush fifos */ 1588 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1589 buf[17] = priv->dp_port_num; 1590 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1591 buf[19] = 0; 1592 1593 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 ) 1594 dbg( "digi_close: write oob failed, ret=%d", ret ); 1595 1596 /* wait for final commands on oob port to complete */ 1597 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE); 1598 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1599 finish_wait(&priv->dp_flush_wait, &wait); 1600 1601 /* shutdown any outstanding bulk writes */ 1602 usb_kill_urb(port->write_urb); 1603 } 1604 1605 tty->closing = 0; 1606 1607exit: 1608 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1609 priv->dp_write_urb_in_use = 0; 1610 priv->dp_in_close = 0; 1611 wake_up_interruptible( &priv->dp_close_wait ); 1612 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1613 1614dbg( "digi_close: done" ); 1615} 1616 1617 1618/* 1619* Digi Startup Device 1620* 1621* Starts reads on all ports. Must be called AFTER startup, with 1622* urbs initialized. Returns 0 if successful, non-zero error otherwise. 1623*/ 1624 1625static int digi_startup_device( struct usb_serial *serial ) 1626{ 1627 1628 int i,ret = 0; 1629 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1630 struct usb_serial_port *port; 1631 1632 1633 /* be sure this happens exactly once */ 1634 spin_lock( &serial_priv->ds_serial_lock ); 1635 if( serial_priv->ds_device_started ) { 1636 spin_unlock( &serial_priv->ds_serial_lock ); 1637 return( 0 ); 1638 } 1639 serial_priv->ds_device_started = 1; 1640 spin_unlock( &serial_priv->ds_serial_lock ); 1641 1642 /* start reading from each bulk in endpoint for the device */ 1643 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1644 for( i=0; i<serial->type->num_ports+1; i++ ) { 1645 1646 port = serial->port[i]; 1647 1648 port->write_urb->dev = port->serial->dev; 1649 1650 if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) { 1651 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1652 ret, i ); 1653 break; 1654 } 1655 1656 } 1657 1658 return( ret ); 1659 1660} 1661 1662 1663static int digi_startup( struct usb_serial *serial ) 1664{ 1665 1666 int i; 1667 struct digi_port *priv; 1668 struct digi_serial *serial_priv; 1669 1670 1671dbg( "digi_startup: TOP" ); 1672 1673 /* allocate the private data structures for all ports */ 1674 /* number of regular ports + 1 for the out-of-band port */ 1675 for( i=0; i<serial->type->num_ports+1; i++ ) { 1676 1677 /* allocate port private structure */ 1678 priv = kmalloc( sizeof(struct digi_port), 1679 GFP_KERNEL ); 1680 if( priv == (struct digi_port *)0 ) { 1681 while( --i >= 0 ) 1682 kfree( usb_get_serial_port_data(serial->port[i]) ); 1683 return( 1 ); /* error */ 1684 } 1685 1686 /* initialize port private structure */ 1687 spin_lock_init( &priv->dp_port_lock ); 1688 priv->dp_port_num = i; 1689 priv->dp_out_buf_len = 0; 1690 priv->dp_in_buf_len = 0; 1691 priv->dp_write_urb_in_use = 0; 1692 priv->dp_modem_signals = 0; 1693 init_waitqueue_head( &priv->dp_modem_change_wait ); 1694 priv->dp_transmit_idle = 0; 1695 init_waitqueue_head( &priv->dp_transmit_idle_wait ); 1696 priv->dp_throttled = 0; 1697 priv->dp_throttle_restart = 0; 1698 init_waitqueue_head( &priv->dp_flush_wait ); 1699 priv->dp_in_close = 0; 1700 init_waitqueue_head( &priv->dp_close_wait ); 1701 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); 1702 priv->dp_port = serial->port[i]; 1703 1704 /* initialize write wait queue for this port */ 1705 init_waitqueue_head( &serial->port[i]->write_wait ); 1706 1707 usb_set_serial_port_data(serial->port[i], priv); 1708 } 1709 1710 /* allocate serial private structure */ 1711 serial_priv = kmalloc( sizeof(struct digi_serial), 1712 GFP_KERNEL ); 1713 if( serial_priv == (struct digi_serial *)0 ) { 1714 for( i=0; i<serial->type->num_ports+1; i++ ) 1715 kfree( usb_get_serial_port_data(serial->port[i]) ); 1716 return( 1 ); /* error */ 1717 } 1718 1719 /* initialize serial private structure */ 1720 spin_lock_init( &serial_priv->ds_serial_lock ); 1721 serial_priv->ds_oob_port_num = serial->type->num_ports; 1722 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1723 serial_priv->ds_device_started = 0; 1724 usb_set_serial_data(serial, serial_priv); 1725 1726 return( 0 ); 1727 1728} 1729 1730 1731static void digi_shutdown( struct usb_serial *serial ) 1732{ 1733 1734 int i; 1735 1736 1737dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() ); 1738 1739 /* stop reads and writes on all ports */ 1740 for( i=0; i<serial->type->num_ports+1; i++ ) { 1741 usb_kill_urb(serial->port[i]->read_urb); 1742 usb_kill_urb(serial->port[i]->write_urb); 1743 } 1744 1745 /* free the private data structures for all ports */ 1746 /* number of regular ports + 1 for the out-of-band port */ 1747 for( i=0; i<serial->type->num_ports+1; i++ ) 1748 kfree( usb_get_serial_port_data(serial->port[i]) ); 1749 kfree( usb_get_serial_data(serial) ); 1750} 1751 1752 1753static void digi_read_bulk_callback( struct urb *urb ) 1754{ 1755 1756 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1757 struct digi_port *priv; 1758 struct digi_serial *serial_priv; 1759 int ret; 1760 1761 1762dbg( "digi_read_bulk_callback: TOP" ); 1763 1764 /* port sanity check, do not resubmit if port is not valid */ 1765 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1766 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1767 urb->status ); 1768 return; 1769 } 1770 if( port->serial == NULL 1771 || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) { 1772 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1773 return; 1774 } 1775 1776 /* do not resubmit urb if it has any status error */ 1777 if( urb->status ) { 1778 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num ); 1779 return; 1780 } 1781 1782 /* handle oob or inb callback, do not resubmit if error */ 1783 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1784 if( digi_read_oob_callback( urb ) != 0 ) 1785 return; 1786 } else { 1787 if( digi_read_inb_callback( urb ) != 0 ) 1788 return; 1789 } 1790 1791 /* continue read */ 1792 urb->dev = port->serial->dev; 1793 if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) { 1794 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__, 1795 ret, priv->dp_port_num ); 1796 } 1797 1798} 1799 1800 1801/* 1802* Digi Read INB Callback 1803* 1804* Digi Read INB Callback handles reads on the in band ports, sending 1805* the data on to the tty subsystem. When called we know port and 1806* port->private are not NULL and port->serial has been validated. 1807* It returns 0 if successful, 1 if successful but the port is 1808* throttled, and -1 if the sanity checks failed. 1809*/ 1810 1811static int digi_read_inb_callback( struct urb *urb ) 1812{ 1813 1814 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1815 struct tty_struct *tty = port->tty; 1816 struct digi_port *priv = usb_get_serial_port_data(port); 1817 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1818 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1819 int status = ((unsigned char *)urb->transfer_buffer)[2]; 1820 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3; 1821 int flag,throttled; 1822 int i; 1823 1824 /* do not process callbacks on closed ports */ 1825 /* but do continue the read chain */ 1826 if( port->open_count == 0 ) 1827 return( 0 ); 1828 1829 /* short/multiple packet check */ 1830 if( urb->actual_length != len + 2 ) { 1831 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, port=%d, opcode=%d, len=%d, actual_length=%d, status=%d", __FUNCTION__, urb->status, priv->dp_port_num, opcode, len, urb->actual_length, status ); 1832 return( -1 ); 1833 } 1834 1835 spin_lock( &priv->dp_port_lock ); 1836 1837 /* check for throttle; if set, do not resubmit read urb */ 1838 /* indicate the read chain needs to be restarted on unthrottle */ 1839 throttled = priv->dp_throttled; 1840 if( throttled ) 1841 priv->dp_throttle_restart = 1; 1842 1843 /* receive data */ 1844 if( opcode == DIGI_CMD_RECEIVE_DATA ) { 1845 1846 /* get flag from status */ 1847 flag = 0; 1848 1849 /* overrun is special, not associated with a char */ 1850 if( status & DIGI_OVERRUN_ERROR ) { 1851 tty_insert_flip_char( tty, 0, TTY_OVERRUN ); 1852 } 1853 1854 /* break takes precedence over parity, */ 1855 /* which takes precedence over framing errors */ 1856 if( status & DIGI_BREAK_ERROR ) { 1857 flag = TTY_BREAK; 1858 } else if( status & DIGI_PARITY_ERROR ) { 1859 flag = TTY_PARITY; 1860 } else if( status & DIGI_FRAMING_ERROR ) { 1861 flag = TTY_FRAME; 1862 } 1863 1864 /* data length is len-1 (one byte of len is status) */ 1865 --len; 1866 1867 if( throttled ) { 1868 1869 len = min( len, 1870 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len ); 1871 1872 if( len > 0 ) { 1873 memcpy( priv->dp_in_buf + priv->dp_in_buf_len, 1874 data, len ); 1875 memset( priv->dp_in_flag_buf 1876 + priv->dp_in_buf_len, flag, len ); 1877 priv->dp_in_buf_len += len; 1878 } 1879 1880 } else { 1881 len = tty_buffer_request_room(tty, len); 1882 if( len > 0 ) { 1883 /* Hot path */ 1884 if(flag == TTY_NORMAL) 1885 tty_insert_flip_string(tty, data, len); 1886 else { 1887 for(i = 0; i < len; i++) 1888 tty_insert_flip_char(tty, data[i], flag); 1889 } 1890 tty_flip_buffer_push( tty ); 1891 } 1892 } 1893 } 1894 1895 spin_unlock( &priv->dp_port_lock ); 1896 1897 if( opcode == DIGI_CMD_RECEIVE_DISABLE ) { 1898 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ ); 1899 } else if( opcode != DIGI_CMD_RECEIVE_DATA ) { 1900 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode ); 1901 } 1902 1903 return( throttled ? 1 : 0 ); 1904 1905} 1906 1907 1908/* 1909* Digi Read OOB Callback 1910* 1911* Digi Read OOB Callback handles reads on the out of band port. 1912* When called we know port and port->private are not NULL and 1913* the port->serial is valid. It returns 0 if successful, and 1914* -1 if the sanity checks failed. 1915*/ 1916 1917static int digi_read_oob_callback( struct urb *urb ) 1918{ 1919 1920 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1921 struct usb_serial *serial = port->serial; 1922 struct digi_port *priv = usb_get_serial_port_data(port); 1923 int opcode, line, status, val; 1924 int i; 1925 1926 1927dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num, 1928urb->actual_length ); 1929 1930 /* handle each oob command */ 1931 for( i=0; i<urb->actual_length-3; ) { 1932 1933 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1934 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1935 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1936 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1937 1938dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", 1939opcode, line, status, val ); 1940 1941 if( status != 0 || line >= serial->type->num_ports ) 1942 continue; 1943 1944 port = serial->port[line]; 1945 1946 if ((priv=usb_get_serial_port_data(port)) == NULL ) 1947 return -1; 1948 1949 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) { 1950 1951 spin_lock( &priv->dp_port_lock ); 1952 1953 /* convert from digi flags to termiox flags */ 1954 if( val & DIGI_READ_INPUT_SIGNALS_CTS ) { 1955 priv->dp_modem_signals |= TIOCM_CTS; 1956 /* port must be open to use tty struct */ 1957 if( port->open_count 1958 && port->tty->termios->c_cflag & CRTSCTS ) { 1959 port->tty->hw_stopped = 0; 1960 digi_wakeup_write( port ); 1961 } 1962 } else { 1963 priv->dp_modem_signals &= ~TIOCM_CTS; 1964 /* port must be open to use tty struct */ 1965 if( port->open_count 1966 && port->tty->termios->c_cflag & CRTSCTS ) { 1967 port->tty->hw_stopped = 1; 1968 } 1969 } 1970 if( val & DIGI_READ_INPUT_SIGNALS_DSR ) 1971 priv->dp_modem_signals |= TIOCM_DSR; 1972 else 1973 priv->dp_modem_signals &= ~TIOCM_DSR; 1974 if( val & DIGI_READ_INPUT_SIGNALS_RI ) 1975 priv->dp_modem_signals |= TIOCM_RI; 1976 else 1977 priv->dp_modem_signals &= ~TIOCM_RI; 1978 if( val & DIGI_READ_INPUT_SIGNALS_DCD ) 1979 priv->dp_modem_signals |= TIOCM_CD; 1980 else 1981 priv->dp_modem_signals &= ~TIOCM_CD; 1982 1983 wake_up_interruptible( &priv->dp_modem_change_wait ); 1984 spin_unlock( &priv->dp_port_lock ); 1985 1986 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) { 1987 1988 spin_lock( &priv->dp_port_lock ); 1989 priv->dp_transmit_idle = 1; 1990 wake_up_interruptible( &priv->dp_transmit_idle_wait ); 1991 spin_unlock( &priv->dp_port_lock ); 1992 1993 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) { 1994 1995 wake_up_interruptible( &priv->dp_flush_wait ); 1996 1997 } 1998 1999 } 2000 2001 return( 0 ); 2002 2003} 2004 2005 2006static int __init digi_init (void) 2007{ 2008 int retval; 2009 retval = usb_serial_register(&digi_acceleport_2_device); 2010 if (retval) 2011 goto failed_acceleport_2_device; 2012 retval = usb_serial_register(&digi_acceleport_4_device); 2013 if (retval) 2014 goto failed_acceleport_4_device; 2015 retval = usb_register(&digi_driver); 2016 if (retval) 2017 goto failed_usb_register; 2018 info(DRIVER_VERSION ":" DRIVER_DESC); 2019 return 0; 2020failed_usb_register: 2021 usb_serial_deregister(&digi_acceleport_4_device); 2022failed_acceleport_4_device: 2023 usb_serial_deregister(&digi_acceleport_2_device); 2024failed_acceleport_2_device: 2025 return retval; 2026} 2027 2028 2029static void __exit digi_exit (void) 2030{ 2031 usb_deregister (&digi_driver); 2032 usb_serial_deregister (&digi_acceleport_2_device); 2033 usb_serial_deregister (&digi_acceleport_4_device); 2034} 2035 2036 2037module_init(digi_init); 2038module_exit(digi_exit); 2039 2040 2041MODULE_AUTHOR( DRIVER_AUTHOR ); 2042MODULE_DESCRIPTION( DRIVER_DESC ); 2043MODULE_LICENSE("GPL"); 2044 2045module_param(debug, bool, S_IRUGO | S_IWUSR); 2046MODULE_PARM_DESC(debug, "Debug enabled or not"); 2047