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 asynchonously 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 1.80.1.2 2000/11/02 05:45:08 root Exp $ 234 */ 235 236 #include <linux/config.h> 237 #include <linux/kernel.h> 238 #include <linux/errno.h> 239 #include <linux/init.h> 240 #include <linux/slab.h> 241 #include <linux/tty.h> 242 #include <linux/tty_driver.h> 243 #include <linux/tty_flip.h> 244 #include <linux/module.h> 245 #include <linux/spinlock.h> 246 #include <linux/workqueue.h> 247 #include <asm/uaccess.h> 248 #include <linux/usb.h> 249 #include <linux/wait.h> 250 #include "usb-serial.h" 251 252 /* Defines */ 253 254 /* 255 * Version Information 256 */ 257 #define DRIVER_VERSION "v1.80.1.2" 258 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 259 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 260 261 /* port output buffer length -- must be <= transfer buffer length - 2 */ 262 /* so we can be sure to send the full buffer in one urb */ 263 #define DIGI_OUT_BUF_SIZE 8 264 265 /* port input buffer length -- must be >= transfer buffer length - 3 */ 266 /* so we can be sure to hold at least one full buffer from one urb */ 267 #define DIGI_IN_BUF_SIZE 64 268 269 /* retry timeout while sleeping */ 270 #define DIGI_RETRY_TIMEOUT (HZ/10) 271 272 /* timeout while waiting for tty output to drain in close */ 273 /* this delay is used twice in close, so the total delay could */ 274 /* be twice this value */ 275 #define DIGI_CLOSE_TIMEOUT (5*HZ) 276 277 278 /* AccelePort USB Defines */ 279 280 /* ids */ 281 #define DIGI_VENDOR_ID 0x05c5 282 #define DIGI_2_ID 0x0002 /* USB-2 */ 283 #define DIGI_4_ID 0x0004 /* USB-4 */ 284 285 /* commands 286 * "INB": can be used on the in-band endpoint 287 * "OOB": can be used on the out-of-band endpoint 288 */ 289 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 290 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 291 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 292 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 293 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 294 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 295 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 296 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 297 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 298 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 299 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 300 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 301 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 302 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 303 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 304 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 305 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 306 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 307 #define DIGI_CMD_SEND_DATA 18 /* INB */ 308 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 309 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 310 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 311 312 /* baud rates */ 313 #define DIGI_BAUD_50 0 314 #define DIGI_BAUD_75 1 315 #define DIGI_BAUD_110 2 316 #define DIGI_BAUD_150 3 317 #define DIGI_BAUD_200 4 318 #define DIGI_BAUD_300 5 319 #define DIGI_BAUD_600 6 320 #define DIGI_BAUD_1200 7 321 #define DIGI_BAUD_1800 8 322 #define DIGI_BAUD_2400 9 323 #define DIGI_BAUD_4800 10 324 #define DIGI_BAUD_7200 11 325 #define DIGI_BAUD_9600 12 326 #define DIGI_BAUD_14400 13 327 #define DIGI_BAUD_19200 14 328 #define DIGI_BAUD_28800 15 329 #define DIGI_BAUD_38400 16 330 #define DIGI_BAUD_57600 17 331 #define DIGI_BAUD_76800 18 332 #define DIGI_BAUD_115200 19 333 #define DIGI_BAUD_153600 20 334 #define DIGI_BAUD_230400 21 335 #define DIGI_BAUD_460800 22 336 337 /* arguments */ 338 #define DIGI_WORD_SIZE_5 0 339 #define DIGI_WORD_SIZE_6 1 340 #define DIGI_WORD_SIZE_7 2 341 #define DIGI_WORD_SIZE_8 3 342 343 #define DIGI_PARITY_NONE 0 344 #define DIGI_PARITY_ODD 1 345 #define DIGI_PARITY_EVEN 2 346 #define DIGI_PARITY_MARK 3 347 #define DIGI_PARITY_SPACE 4 348 349 #define DIGI_STOP_BITS_1 0 350 #define DIGI_STOP_BITS_2 1 351 352 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 353 #define DIGI_INPUT_FLOW_CONTROL_RTS 2 354 #define DIGI_INPUT_FLOW_CONTROL_DTR 4 355 356 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 357 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 358 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 359 360 #define DIGI_DTR_INACTIVE 0 361 #define DIGI_DTR_ACTIVE 1 362 #define DIGI_DTR_INPUT_FLOW_CONTROL 2 363 364 #define DIGI_RTS_INACTIVE 0 365 #define DIGI_RTS_ACTIVE 1 366 #define DIGI_RTS_INPUT_FLOW_CONTROL 2 367 #define DIGI_RTS_TOGGLE 3 368 369 #define DIGI_FLUSH_TX 1 370 #define DIGI_FLUSH_RX 2 371 #define DIGI_RESUME_TX 4 /* clears xoff condition */ 372 373 #define DIGI_TRANSMIT_NOT_IDLE 0 374 #define DIGI_TRANSMIT_IDLE 1 375 376 #define DIGI_DISABLE 0 377 #define DIGI_ENABLE 1 378 379 #define DIGI_DEASSERT 0 380 #define DIGI_ASSERT 1 381 382 /* in band status codes */ 383 #define DIGI_OVERRUN_ERROR 4 384 #define DIGI_PARITY_ERROR 8 385 #define DIGI_FRAMING_ERROR 16 386 #define DIGI_BREAK_ERROR 32 387 388 /* out of band status */ 389 #define DIGI_NO_ERROR 0 390 #define DIGI_BAD_FIRST_PARAMETER 1 391 #define DIGI_BAD_SECOND_PARAMETER 2 392 #define DIGI_INVALID_LINE 3 393 #define DIGI_INVALID_OPCODE 4 394 395 /* input signals */ 396 #define DIGI_READ_INPUT_SIGNALS_SLOT 1 397 #define DIGI_READ_INPUT_SIGNALS_ERR 2 398 #define DIGI_READ_INPUT_SIGNALS_BUSY 4 399 #define DIGI_READ_INPUT_SIGNALS_PE 8 400 #define DIGI_READ_INPUT_SIGNALS_CTS 16 401 #define DIGI_READ_INPUT_SIGNALS_DSR 32 402 #define DIGI_READ_INPUT_SIGNALS_RI 64 403 #define DIGI_READ_INPUT_SIGNALS_DCD 128 404 405 406 /* Structures */ 407 408 struct digi_serial { 409 spinlock_t ds_serial_lock; 410 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 411 int ds_oob_port_num; /* index of out-of-band port */ 412 int ds_device_started; 413 }; 414 415 struct digi_port { 416 spinlock_t dp_port_lock; 417 int dp_port_num; 418 int dp_out_buf_len; 419 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 420 int dp_in_buf_len; 421 unsigned char dp_in_buf[DIGI_IN_BUF_SIZE]; 422 unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE]; 423 int dp_write_urb_in_use; 424 unsigned int dp_modem_signals; 425 wait_queue_head_t dp_modem_change_wait; 426 int dp_transmit_idle; 427 wait_queue_head_t dp_transmit_idle_wait; 428 int dp_throttled; 429 int dp_throttle_restart; 430 wait_queue_head_t dp_flush_wait; 431 int dp_in_close; /* close in progress */ 432 wait_queue_head_t dp_close_wait; /* wait queue for close */ 433 struct work_struct dp_wakeup_work; 434 }; 435 436 437 /* Local Function Declarations */ 438 439 static void digi_wakeup_write( struct usb_serial_port *port ); 440 static void digi_wakeup_write_lock(void *); 441 static int digi_write_oob_command( struct usb_serial_port *port, 442 unsigned char *buf, int count, int interruptible ); 443 static int digi_write_inb_command( struct usb_serial_port *port, 444 unsigned char *buf, int count, unsigned long timeout ); 445 static int digi_set_modem_signals( struct usb_serial_port *port, 446 unsigned int modem_signals, int interruptible ); 447 static int digi_transmit_idle( struct usb_serial_port *port, 448 unsigned long timeout ); 449 static void digi_rx_throttle (struct usb_serial_port *port); 450 static void digi_rx_unthrottle (struct usb_serial_port *port); 451 static void digi_set_termios( struct usb_serial_port *port, 452 struct termios *old_termios ); 453 static void digi_break_ctl( struct usb_serial_port *port, int break_state ); 454 static int digi_ioctl( struct usb_serial_port *port, struct file *file, 455 unsigned int cmd, unsigned long arg ); 456 static int digi_tiocmget( struct usb_serial_port *port, struct file *file ); 457 static int digi_tiocmset( struct usb_serial_port *port, struct file *file, 458 unsigned int set, unsigned int clear ); 459 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ); 460 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs ); 461 static int digi_write_room( struct usb_serial_port *port ); 462 static int digi_chars_in_buffer( struct usb_serial_port *port ); 463 static int digi_open( struct usb_serial_port *port, struct file *filp ); 464 static void digi_close( struct usb_serial_port *port, struct file *filp ); 465 static int digi_startup_device( struct usb_serial *serial ); 466 static int digi_startup( struct usb_serial *serial ); 467 static void digi_shutdown( struct usb_serial *serial ); 468 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs ); 469 static int digi_read_inb_callback( struct urb *urb ); 470 static int digi_read_oob_callback( struct urb *urb ); 471 472 473 /* Statics */ 474 475 static int debug; 476 477 static 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 }; 482 483 static struct usb_device_id id_table_2 [] = { 484 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 485 { } /* Terminating entry */ 486 }; 487 488 static struct usb_device_id id_table_4 [] = { 489 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 490 { } /* Terminating entry */ 491 }; 492 493 MODULE_DEVICE_TABLE (usb, id_table_combined); 494 495 static struct usb_driver digi_driver = { 496 .owner = THIS_MODULE, 497 .name = "digi_acceleport", 498 .probe = usb_serial_probe, 499 .disconnect = usb_serial_disconnect, 500 .id_table = id_table_combined, 501 }; 502 503 504 /* device info needed for the Digi serial converter */ 505 506 static 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 .id_table = id_table_2, 513 .num_interrupt_in = 0, 514 .num_bulk_in = 4, 515 .num_bulk_out = 4, 516 .num_ports = 3, 517 .open = digi_open, 518 .close = digi_close, 519 .write = digi_write, 520 .write_room = digi_write_room, 521 .write_bulk_callback = digi_write_bulk_callback, 522 .read_bulk_callback = digi_read_bulk_callback, 523 .chars_in_buffer = digi_chars_in_buffer, 524 .throttle = digi_rx_throttle, 525 .unthrottle = digi_rx_unthrottle, 526 .ioctl = digi_ioctl, 527 .set_termios = digi_set_termios, 528 .break_ctl = digi_break_ctl, 529 .tiocmget = digi_tiocmget, 530 .tiocmset = digi_tiocmset, 531 .attach = digi_startup, 532 .shutdown = digi_shutdown, 533 }; 534 535 static struct usb_serial_driver digi_acceleport_4_device = { 536 .driver = { 537 .owner = THIS_MODULE, 538 .name = "digi_4", 539 }, 540 .description = "Digi 4 port USB adapter", 541 .id_table = id_table_4, 542 .num_interrupt_in = 0, 543 .num_bulk_in = 5, 544 .num_bulk_out = 5, 545 .num_ports = 4, 546 .open = digi_open, 547 .close = digi_close, 548 .write = digi_write, 549 .write_room = digi_write_room, 550 .write_bulk_callback = digi_write_bulk_callback, 551 .read_bulk_callback = digi_read_bulk_callback, 552 .chars_in_buffer = digi_chars_in_buffer, 553 .throttle = digi_rx_throttle, 554 .unthrottle = digi_rx_unthrottle, 555 .ioctl = digi_ioctl, 556 .set_termios = digi_set_termios, 557 .break_ctl = digi_break_ctl, 558 .tiocmget = digi_tiocmget, 559 .tiocmset = digi_tiocmset, 560 .attach = digi_startup, 561 .shutdown = digi_shutdown, 562 }; 563 564 565 /* Functions */ 566 567 /* 568 * Cond Wait Interruptible Timeout Irqrestore 569 * 570 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 571 * so that wake ups are not lost if they occur between the unlock 572 * and the sleep. In other words, spin_unlock_irqrestore and 573 * interruptible_sleep_on_timeout are "atomic" with respect to 574 * wake ups. This is used to implement condition variables. 575 * 576 * interruptible_sleep_on_timeout is deprecated and has been replaced 577 * with the equivalent code. 578 */ 579 580 static inline long cond_wait_interruptible_timeout_irqrestore( 581 wait_queue_head_t *q, long timeout, 582 spinlock_t *lock, unsigned long flags ) 583 { 584 DEFINE_WAIT(wait); 585 586 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 587 spin_unlock_irqrestore(lock, flags); 588 timeout = schedule_timeout(timeout); 589 finish_wait(q, &wait); 590 591 return timeout; 592 } 593 594 595 /* 596 * Digi Wakeup Write 597 * 598 * Wake up port, line discipline, and tty processes sleeping 599 * on writes. 600 */ 601 602 static void digi_wakeup_write_lock(void *arg) 603 { 604 struct usb_serial_port *port = arg; 605 unsigned long flags; 606 struct digi_port *priv = usb_get_serial_port_data(port); 607 608 609 spin_lock_irqsave( &priv->dp_port_lock, flags ); 610 digi_wakeup_write( port ); 611 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 612 } 613 614 static void digi_wakeup_write( struct usb_serial_port *port ) 615 { 616 617 struct tty_struct *tty = port->tty; 618 619 620 /* wake up port processes */ 621 wake_up_interruptible( &port->write_wait ); 622 623 /* wake up line discipline */ 624 tty_wakeup(tty); 625 } 626 627 628 /* 629 * Digi Write OOB Command 630 * 631 * Write commands on the out of band port. Commands are 4 632 * bytes each, multiple commands can be sent at once, and 633 * no command will be split across USB packets. Returns 0 634 * if successful, -EINTR if interrupted while sleeping and 635 * the interruptible flag is true, or a negative error 636 * returned by usb_submit_urb. 637 */ 638 639 static int digi_write_oob_command( struct usb_serial_port *port, 640 unsigned char *buf, int count, int interruptible ) 641 { 642 643 int ret = 0; 644 int len; 645 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 646 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 647 unsigned long flags = 0; 648 649 650 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count ); 651 652 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 653 654 while( count > 0 ) { 655 656 while( oob_port->write_urb->status == -EINPROGRESS 657 || oob_priv->dp_write_urb_in_use ) { 658 cond_wait_interruptible_timeout_irqrestore( 659 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 660 &oob_priv->dp_port_lock, flags ); 661 if( interruptible && signal_pending(current) ) { 662 return( -EINTR ); 663 } 664 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 665 } 666 667 /* len must be a multiple of 4, so commands are not split */ 668 len = min(count, oob_port->bulk_out_size ); 669 if( len > 4 ) 670 len &= ~3; 671 672 memcpy( oob_port->write_urb->transfer_buffer, buf, len ); 673 oob_port->write_urb->transfer_buffer_length = len; 674 oob_port->write_urb->dev = port->serial->dev; 675 676 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 677 oob_priv->dp_write_urb_in_use = 1; 678 count -= len; 679 buf += len; 680 } 681 682 } 683 684 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 685 686 if( ret ) { 687 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 688 ret ); 689 } 690 691 return( ret ); 692 693 } 694 695 696 /* 697 * Digi Write In Band Command 698 * 699 * Write commands on the given port. Commands are 4 700 * bytes each, multiple commands can be sent at once, and 701 * no command will be split across USB packets. If timeout 702 * is non-zero, write in band command will return after 703 * waiting unsuccessfully for the URB status to clear for 704 * timeout ticks. Returns 0 if successful, or a negative 705 * error returned by digi_write. 706 */ 707 708 static int digi_write_inb_command( struct usb_serial_port *port, 709 unsigned char *buf, int count, unsigned long timeout ) 710 { 711 712 int ret = 0; 713 int len; 714 struct digi_port *priv = usb_get_serial_port_data(port); 715 unsigned char *data = port->write_urb->transfer_buffer; 716 unsigned long flags = 0; 717 718 719 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num, 720 count ); 721 722 if( timeout ) 723 timeout += jiffies; 724 else 725 timeout = ULONG_MAX; 726 727 spin_lock_irqsave( &priv->dp_port_lock, flags ); 728 729 while( count > 0 && ret == 0 ) { 730 731 while( (port->write_urb->status == -EINPROGRESS 732 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) { 733 cond_wait_interruptible_timeout_irqrestore( 734 &port->write_wait, DIGI_RETRY_TIMEOUT, 735 &priv->dp_port_lock, flags ); 736 if( signal_pending(current) ) { 737 return( -EINTR ); 738 } 739 spin_lock_irqsave( &priv->dp_port_lock, flags ); 740 } 741 742 /* len must be a multiple of 4 and small enough to */ 743 /* guarantee the write will send buffered data first, */ 744 /* so commands are in order with data and not split */ 745 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len ); 746 if( len > 4 ) 747 len &= ~3; 748 749 /* write any buffered data first */ 750 if( priv->dp_out_buf_len > 0 ) { 751 data[0] = DIGI_CMD_SEND_DATA; 752 data[1] = priv->dp_out_buf_len; 753 memcpy( data+2, priv->dp_out_buf, 754 priv->dp_out_buf_len ); 755 memcpy( data+2+priv->dp_out_buf_len, buf, len ); 756 port->write_urb->transfer_buffer_length 757 = priv->dp_out_buf_len+2+len; 758 } else { 759 memcpy( data, buf, len ); 760 port->write_urb->transfer_buffer_length = len; 761 } 762 port->write_urb->dev = port->serial->dev; 763 764 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 765 priv->dp_write_urb_in_use = 1; 766 priv->dp_out_buf_len = 0; 767 count -= len; 768 buf += len; 769 } 770 771 } 772 773 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 774 775 if( ret ) { 776 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 777 ret, priv->dp_port_num ); 778 } 779 780 return( ret ); 781 782 } 783 784 785 /* 786 * Digi Set Modem Signals 787 * 788 * Sets or clears DTR and RTS on the port, according to the 789 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 790 * for the modem_signals argument. Returns 0 if successful, 791 * -EINTR if interrupted while sleeping, or a non-zero error 792 * returned by usb_submit_urb. 793 */ 794 795 static int digi_set_modem_signals( struct usb_serial_port *port, 796 unsigned int modem_signals, int interruptible ) 797 { 798 799 int ret; 800 struct digi_port *port_priv = usb_get_serial_port_data(port); 801 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 802 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 803 unsigned char *data = oob_port->write_urb->transfer_buffer; 804 unsigned long flags = 0; 805 806 807 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", 808 port_priv->dp_port_num, modem_signals ); 809 810 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 811 spin_lock( &port_priv->dp_port_lock ); 812 813 while( oob_port->write_urb->status == -EINPROGRESS 814 || oob_priv->dp_write_urb_in_use ) { 815 spin_unlock( &port_priv->dp_port_lock ); 816 cond_wait_interruptible_timeout_irqrestore( 817 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 818 &oob_priv->dp_port_lock, flags ); 819 if( interruptible && signal_pending(current) ) { 820 return( -EINTR ); 821 } 822 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 823 spin_lock( &port_priv->dp_port_lock ); 824 } 825 826 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 827 data[1] = port_priv->dp_port_num; 828 data[2] = (modem_signals&TIOCM_DTR) ? 829 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 830 data[3] = 0; 831 832 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 833 data[5] = port_priv->dp_port_num; 834 data[6] = (modem_signals&TIOCM_RTS) ? 835 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 836 data[7] = 0; 837 838 oob_port->write_urb->transfer_buffer_length = 8; 839 oob_port->write_urb->dev = port->serial->dev; 840 841 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 842 oob_priv->dp_write_urb_in_use = 1; 843 port_priv->dp_modem_signals = 844 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 845 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 846 } 847 848 spin_unlock( &port_priv->dp_port_lock ); 849 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 850 851 if( ret ) { 852 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 853 ret ); 854 } 855 856 return( ret ); 857 858 } 859 860 861 /* 862 * Digi Transmit Idle 863 * 864 * Digi transmit idle waits, up to timeout ticks, for the transmitter 865 * to go idle. It returns 0 if successful or a negative error. 866 * 867 * There are race conditions here if more than one process is calling 868 * digi_transmit_idle on the same port at the same time. However, this 869 * is only called from close, and only one process can be in close on a 870 * port at a time, so its ok. 871 */ 872 873 static int digi_transmit_idle( struct usb_serial_port *port, 874 unsigned long timeout ) 875 { 876 877 int ret; 878 unsigned char buf[2]; 879 struct digi_port *priv = usb_get_serial_port_data(port); 880 unsigned long flags = 0; 881 882 883 spin_lock_irqsave( &priv->dp_port_lock, flags ); 884 priv->dp_transmit_idle = 0; 885 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 886 887 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 888 buf[1] = 0; 889 890 timeout += jiffies; 891 892 if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 ) 893 return( ret ); 894 895 spin_lock_irqsave( &priv->dp_port_lock, flags ); 896 897 while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) { 898 cond_wait_interruptible_timeout_irqrestore( 899 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 900 &priv->dp_port_lock, flags ); 901 if( signal_pending(current) ) { 902 return( -EINTR ); 903 } 904 spin_lock_irqsave( &priv->dp_port_lock, flags ); 905 } 906 907 priv->dp_transmit_idle = 0; 908 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 909 910 return( 0 ); 911 912 } 913 914 915 static void digi_rx_throttle( struct usb_serial_port *port ) 916 { 917 918 unsigned long flags; 919 struct digi_port *priv = usb_get_serial_port_data(port); 920 921 922 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num ); 923 924 /* stop receiving characters by not resubmitting the read urb */ 925 spin_lock_irqsave( &priv->dp_port_lock, flags ); 926 priv->dp_throttled = 1; 927 priv->dp_throttle_restart = 0; 928 priv->dp_in_buf_len = 0; 929 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 930 931 } 932 933 934 static void digi_rx_unthrottle( struct usb_serial_port *port ) 935 { 936 937 int ret = 0; 938 int len; 939 unsigned long flags; 940 struct digi_port *priv = usb_get_serial_port_data(port); 941 struct tty_struct *tty = port->tty; 942 943 944 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num ); 945 946 spin_lock_irqsave( &priv->dp_port_lock, flags ); 947 948 /* send any buffered chars from throttle time on to tty subsystem */ 949 len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count ); 950 if( len > 0 ) { 951 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len ); 952 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len ); 953 tty->flip.char_buf_ptr += len; 954 tty->flip.flag_buf_ptr += len; 955 tty->flip.count += len; 956 tty_flip_buffer_push( tty ); 957 } 958 959 /* restart read chain */ 960 if( priv->dp_throttle_restart ) { 961 port->read_urb->dev = port->serial->dev; 962 ret = usb_submit_urb( port->read_urb, GFP_ATOMIC ); 963 } 964 965 /* turn throttle off */ 966 priv->dp_throttled = 0; 967 priv->dp_in_buf_len = 0; 968 priv->dp_throttle_restart = 0; 969 970 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 971 972 if( ret ) { 973 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 974 ret, priv->dp_port_num ); 975 } 976 977 } 978 979 980 static void digi_set_termios( struct usb_serial_port *port, 981 struct termios *old_termios ) 982 { 983 984 struct digi_port *priv = usb_get_serial_port_data(port); 985 unsigned int iflag = port->tty->termios->c_iflag; 986 unsigned int cflag = port->tty->termios->c_cflag; 987 unsigned int old_iflag = old_termios->c_iflag; 988 unsigned int old_cflag = old_termios->c_cflag; 989 unsigned char buf[32]; 990 unsigned int modem_signals; 991 int arg,ret; 992 int i = 0; 993 994 995 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 ); 996 997 /* set baud rate */ 998 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) { 999 1000 arg = -1; 1001 1002 /* reassert DTR and (maybe) RTS on transition from B0 */ 1003 if( (old_cflag&CBAUD) == B0 ) { 1004 /* don't set RTS if using hardware flow control */ 1005 /* and throttling input */ 1006 modem_signals = TIOCM_DTR; 1007 if( !(port->tty->termios->c_cflag & CRTSCTS) || 1008 !test_bit(TTY_THROTTLED, &port->tty->flags) ) { 1009 modem_signals |= TIOCM_RTS; 1010 } 1011 digi_set_modem_signals( port, modem_signals, 1 ); 1012 } 1013 1014 switch( (cflag&CBAUD) ) { 1015 /* drop DTR and RTS on transition to B0 */ 1016 case B0: digi_set_modem_signals( port, 0, 1 ); break; 1017 case B50: arg = DIGI_BAUD_50; break; 1018 case B75: arg = DIGI_BAUD_75; break; 1019 case B110: arg = DIGI_BAUD_110; break; 1020 case B150: arg = DIGI_BAUD_150; break; 1021 case B200: arg = DIGI_BAUD_200; break; 1022 case B300: arg = DIGI_BAUD_300; break; 1023 case B600: arg = DIGI_BAUD_600; break; 1024 case B1200: arg = DIGI_BAUD_1200; break; 1025 case B1800: arg = DIGI_BAUD_1800; break; 1026 case B2400: arg = DIGI_BAUD_2400; break; 1027 case B4800: arg = DIGI_BAUD_4800; break; 1028 case B9600: arg = DIGI_BAUD_9600; break; 1029 case B19200: arg = DIGI_BAUD_19200; break; 1030 case B38400: arg = DIGI_BAUD_38400; break; 1031 case B57600: arg = DIGI_BAUD_57600; break; 1032 case B115200: arg = DIGI_BAUD_115200; break; 1033 case B230400: arg = DIGI_BAUD_230400; break; 1034 case B460800: arg = DIGI_BAUD_460800; break; 1035 default: 1036 dbg( "digi_set_termios: can't handle baud rate 0x%x", 1037 (cflag&CBAUD) ); 1038 break; 1039 } 1040 1041 if( arg != -1 ) { 1042 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 1043 buf[i++] = priv->dp_port_num; 1044 buf[i++] = arg; 1045 buf[i++] = 0; 1046 } 1047 1048 } 1049 1050 /* set parity */ 1051 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) { 1052 1053 if( (cflag&PARENB) ) { 1054 if( (cflag&PARODD) ) 1055 arg = DIGI_PARITY_ODD; 1056 else 1057 arg = DIGI_PARITY_EVEN; 1058 } else { 1059 arg = DIGI_PARITY_NONE; 1060 } 1061 1062 buf[i++] = DIGI_CMD_SET_PARITY; 1063 buf[i++] = priv->dp_port_num; 1064 buf[i++] = arg; 1065 buf[i++] = 0; 1066 1067 } 1068 1069 /* set word size */ 1070 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) { 1071 1072 arg = -1; 1073 1074 switch( (cflag&CSIZE) ) { 1075 case CS5: arg = DIGI_WORD_SIZE_5; break; 1076 case CS6: arg = DIGI_WORD_SIZE_6; break; 1077 case CS7: arg = DIGI_WORD_SIZE_7; break; 1078 case CS8: arg = DIGI_WORD_SIZE_8; break; 1079 default: 1080 dbg( "digi_set_termios: can't handle word size %d", 1081 (cflag&CSIZE) ); 1082 break; 1083 } 1084 1085 if( arg != -1 ) { 1086 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 1087 buf[i++] = priv->dp_port_num; 1088 buf[i++] = arg; 1089 buf[i++] = 0; 1090 } 1091 1092 } 1093 1094 /* set stop bits */ 1095 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) { 1096 1097 if( (cflag&CSTOPB) ) 1098 arg = DIGI_STOP_BITS_2; 1099 else 1100 arg = DIGI_STOP_BITS_1; 1101 1102 buf[i++] = DIGI_CMD_SET_STOP_BITS; 1103 buf[i++] = priv->dp_port_num; 1104 buf[i++] = arg; 1105 buf[i++] = 0; 1106 1107 } 1108 1109 /* set input flow control */ 1110 if( (iflag&IXOFF) != (old_iflag&IXOFF) 1111 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1112 1113 arg = 0; 1114 1115 if( (iflag&IXOFF) ) 1116 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1117 else 1118 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1119 1120 if( (cflag&CRTSCTS) ) { 1121 1122 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 1123 1124 /* On USB-4 it is necessary to assert RTS prior */ 1125 /* to selecting RTS input flow control. */ 1126 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 1127 buf[i++] = priv->dp_port_num; 1128 buf[i++] = DIGI_RTS_ACTIVE; 1129 buf[i++] = 0; 1130 1131 } else { 1132 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 1133 } 1134 1135 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1136 buf[i++] = priv->dp_port_num; 1137 buf[i++] = arg; 1138 buf[i++] = 0; 1139 1140 } 1141 1142 /* set output flow control */ 1143 if( (iflag&IXON) != (old_iflag&IXON) 1144 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1145 1146 arg = 0; 1147 1148 if( (iflag&IXON) ) 1149 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1150 else 1151 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1152 1153 if( (cflag&CRTSCTS) ) { 1154 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 1155 } else { 1156 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 1157 port->tty->hw_stopped = 0; 1158 } 1159 1160 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1161 buf[i++] = priv->dp_port_num; 1162 buf[i++] = arg; 1163 buf[i++] = 0; 1164 1165 } 1166 1167 /* set receive enable/disable */ 1168 if( (cflag&CREAD) != (old_cflag&CREAD) ) { 1169 1170 if( (cflag&CREAD) ) 1171 arg = DIGI_ENABLE; 1172 else 1173 arg = DIGI_DISABLE; 1174 1175 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 1176 buf[i++] = priv->dp_port_num; 1177 buf[i++] = arg; 1178 buf[i++] = 0; 1179 1180 } 1181 1182 if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 ) 1183 dbg( "digi_set_termios: write oob failed, ret=%d", ret ); 1184 1185 } 1186 1187 1188 static void digi_break_ctl( struct usb_serial_port *port, int break_state ) 1189 { 1190 1191 unsigned char buf[4]; 1192 1193 1194 buf[0] = DIGI_CMD_BREAK_CONTROL; 1195 buf[1] = 2; /* length */ 1196 buf[2] = break_state ? 1 : 0; 1197 buf[3] = 0; /* pad */ 1198 1199 digi_write_inb_command( port, buf, 4, 0 ); 1200 1201 } 1202 1203 1204 static int digi_tiocmget( struct usb_serial_port *port, struct file *file ) 1205 { 1206 struct digi_port *priv = usb_get_serial_port_data(port); 1207 unsigned int val; 1208 unsigned long flags; 1209 1210 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1211 1212 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1213 val = priv->dp_modem_signals; 1214 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1215 return val; 1216 } 1217 1218 1219 static int digi_tiocmset( struct usb_serial_port *port, struct file *file, 1220 unsigned int set, unsigned int clear ) 1221 { 1222 struct digi_port *priv = usb_get_serial_port_data(port); 1223 unsigned int val; 1224 unsigned long flags; 1225 1226 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1227 1228 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1229 val = (priv->dp_modem_signals & ~clear) | set; 1230 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1231 return digi_set_modem_signals( port, val, 1 ); 1232 } 1233 1234 1235 static int digi_ioctl( struct usb_serial_port *port, struct file *file, 1236 unsigned int cmd, unsigned long arg ) 1237 { 1238 1239 struct digi_port *priv = usb_get_serial_port_data(port); 1240 1241 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd ); 1242 1243 switch (cmd) { 1244 1245 case TIOCMIWAIT: 1246 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/ 1247 /* TODO */ 1248 return( 0 ); 1249 1250 case TIOCGICOUNT: 1251 /* return count of modemline transitions */ 1252 /* TODO */ 1253 return 0; 1254 1255 } 1256 1257 return( -ENOIOCTLCMD ); 1258 1259 } 1260 1261 1262 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ) 1263 { 1264 1265 int ret,data_len,new_len; 1266 struct digi_port *priv = usb_get_serial_port_data(port); 1267 unsigned char *data = port->write_urb->transfer_buffer; 1268 unsigned long flags = 0; 1269 1270 1271 dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", 1272 priv->dp_port_num, count, in_interrupt() ); 1273 1274 /* copy user data (which can sleep) before getting spin lock */ 1275 count = min( count, port->bulk_out_size-2 ); 1276 count = min( 64, count); 1277 1278 /* be sure only one write proceeds at a time */ 1279 /* there are races on the port private buffer */ 1280 /* and races to check write_urb->status */ 1281 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1282 1283 /* wait for urb status clear to submit another urb */ 1284 if( port->write_urb->status == -EINPROGRESS 1285 || priv->dp_write_urb_in_use ) { 1286 1287 /* buffer data if count is 1 (probably put_char) if possible */ 1288 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) { 1289 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 1290 new_len = 1; 1291 } else { 1292 new_len = 0; 1293 } 1294 1295 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1296 1297 return( new_len ); 1298 1299 } 1300 1301 /* allow space for any buffered data and for new data, up to */ 1302 /* transfer buffer size - 2 (for command and length bytes) */ 1303 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 1304 data_len = new_len + priv->dp_out_buf_len; 1305 1306 if( data_len == 0 ) { 1307 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1308 return( 0 ); 1309 } 1310 1311 port->write_urb->transfer_buffer_length = data_len+2; 1312 port->write_urb->dev = port->serial->dev; 1313 1314 *data++ = DIGI_CMD_SEND_DATA; 1315 *data++ = data_len; 1316 1317 /* copy in buffered data first */ 1318 memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len ); 1319 data += priv->dp_out_buf_len; 1320 1321 /* copy in new data */ 1322 memcpy( data, buf, new_len ); 1323 1324 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1325 priv->dp_write_urb_in_use = 1; 1326 ret = new_len; 1327 priv->dp_out_buf_len = 0; 1328 } 1329 1330 /* return length of new data written, or error */ 1331 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1332 if( ret < 0 ) { 1333 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1334 ret, priv->dp_port_num ); 1335 } 1336 1337 dbg( "digi_write: returning %d", ret ); 1338 return( ret ); 1339 1340 } 1341 1342 1343 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs ) 1344 { 1345 1346 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1347 struct usb_serial *serial; 1348 struct digi_port *priv; 1349 struct digi_serial *serial_priv; 1350 int ret = 0; 1351 1352 1353 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status ); 1354 1355 /* port and serial sanity check */ 1356 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1357 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1358 urb->status ); 1359 return; 1360 } 1361 serial = port->serial; 1362 if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) { 1363 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1364 return; 1365 } 1366 1367 /* handle oob callback */ 1368 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1369 dbg( "digi_write_bulk_callback: oob callback" ); 1370 spin_lock( &priv->dp_port_lock ); 1371 priv->dp_write_urb_in_use = 0; 1372 wake_up_interruptible( &port->write_wait ); 1373 spin_unlock( &priv->dp_port_lock ); 1374 return; 1375 } 1376 1377 /* try to send any buffered data on this port, if it is open */ 1378 spin_lock( &priv->dp_port_lock ); 1379 priv->dp_write_urb_in_use = 0; 1380 if( port->open_count && port->write_urb->status != -EINPROGRESS 1381 && priv->dp_out_buf_len > 0 ) { 1382 1383 *((unsigned char *)(port->write_urb->transfer_buffer)) 1384 = (unsigned char)DIGI_CMD_SEND_DATA; 1385 *((unsigned char *)(port->write_urb->transfer_buffer)+1) 1386 = (unsigned char)priv->dp_out_buf_len; 1387 1388 port->write_urb->transfer_buffer_length 1389 = priv->dp_out_buf_len+2; 1390 port->write_urb->dev = serial->dev; 1391 1392 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf, 1393 priv->dp_out_buf_len ); 1394 1395 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1396 priv->dp_write_urb_in_use = 1; 1397 priv->dp_out_buf_len = 0; 1398 } 1399 1400 } 1401 1402 /* wake up processes sleeping on writes immediately */ 1403 digi_wakeup_write( port ); 1404 1405 /* also queue up a wakeup at scheduler time, in case we */ 1406 /* lost the race in write_chan(). */ 1407 schedule_work(&priv->dp_wakeup_work); 1408 1409 spin_unlock( &priv->dp_port_lock ); 1410 1411 if( ret ) { 1412 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1413 ret, priv->dp_port_num ); 1414 } 1415 1416 } 1417 1418 1419 static int digi_write_room( struct usb_serial_port *port ) 1420 { 1421 1422 int room; 1423 struct digi_port *priv = usb_get_serial_port_data(port); 1424 unsigned long flags = 0; 1425 1426 1427 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1428 1429 if( port->write_urb->status == -EINPROGRESS 1430 || priv->dp_write_urb_in_use ) 1431 room = 0; 1432 else 1433 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1434 1435 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1436 1437 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room ); 1438 return( room ); 1439 1440 } 1441 1442 1443 static int digi_chars_in_buffer( struct usb_serial_port *port ) 1444 { 1445 1446 struct digi_port *priv = usb_get_serial_port_data(port); 1447 1448 1449 if( port->write_urb->status == -EINPROGRESS 1450 || priv->dp_write_urb_in_use ) { 1451 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 ); 1452 /* return( port->bulk_out_size - 2 ); */ 1453 return( 256 ); 1454 } else { 1455 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len ); 1456 return( priv->dp_out_buf_len ); 1457 } 1458 1459 } 1460 1461 1462 static int digi_open( struct usb_serial_port *port, struct file *filp ) 1463 { 1464 1465 int ret; 1466 unsigned char buf[32]; 1467 struct digi_port *priv = usb_get_serial_port_data(port); 1468 struct termios not_termios; 1469 unsigned long flags = 0; 1470 1471 1472 dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1473 1474 /* be sure the device is started up */ 1475 if( digi_startup_device( port->serial ) != 0 ) 1476 return( -ENXIO ); 1477 1478 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1479 1480 /* don't wait on a close in progress for non-blocking opens */ 1481 if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1482 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1483 return( -EAGAIN ); 1484 } 1485 1486 /* wait for a close in progress to finish */ 1487 while( priv->dp_in_close ) { 1488 cond_wait_interruptible_timeout_irqrestore( 1489 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT, 1490 &priv->dp_port_lock, flags ); 1491 if( signal_pending(current) ) { 1492 return( -EINTR ); 1493 } 1494 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1495 } 1496 1497 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1498 1499 /* read modem signals automatically whenever they change */ 1500 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1501 buf[1] = priv->dp_port_num; 1502 buf[2] = DIGI_ENABLE; 1503 buf[3] = 0; 1504 1505 /* flush fifos */ 1506 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1507 buf[5] = priv->dp_port_num; 1508 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1509 buf[7] = 0; 1510 1511 if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 ) 1512 dbg( "digi_open: write oob failed, ret=%d", ret ); 1513 1514 /* set termios settings */ 1515 not_termios.c_cflag = ~port->tty->termios->c_cflag; 1516 not_termios.c_iflag = ~port->tty->termios->c_iflag; 1517 digi_set_termios( port, ¬_termios ); 1518 1519 /* set DTR and RTS */ 1520 digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 ); 1521 1522 return( 0 ); 1523 1524 } 1525 1526 1527 static void digi_close( struct usb_serial_port *port, struct file *filp ) 1528 { 1529 DEFINE_WAIT(wait); 1530 int ret; 1531 unsigned char buf[32]; 1532 struct tty_struct *tty = port->tty; 1533 struct digi_port *priv = usb_get_serial_port_data(port); 1534 unsigned long flags = 0; 1535 1536 1537 dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1538 1539 1540 /* if disconnected, just clear flags */ 1541 if (!usb_get_intfdata(port->serial->interface)) 1542 goto exit; 1543 1544 /* do cleanup only after final close on this port */ 1545 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1546 priv->dp_in_close = 1; 1547 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1548 1549 /* tell line discipline to process only XON/XOFF */ 1550 tty->closing = 1; 1551 1552 /* wait for output to drain */ 1553 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1554 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT ); 1555 } 1556 1557 /* flush driver and line discipline buffers */ 1558 if( tty->driver->flush_buffer ) 1559 tty->driver->flush_buffer( tty ); 1560 tty_ldisc_flush(tty); 1561 1562 if (port->serial->dev) { 1563 /* wait for transmit idle */ 1564 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1565 digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT ); 1566 } 1567 1568 /* drop DTR and RTS */ 1569 digi_set_modem_signals( port, 0, 0 ); 1570 1571 /* disable input flow control */ 1572 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1573 buf[1] = priv->dp_port_num; 1574 buf[2] = DIGI_DISABLE; 1575 buf[3] = 0; 1576 1577 /* disable output flow control */ 1578 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1579 buf[5] = priv->dp_port_num; 1580 buf[6] = DIGI_DISABLE; 1581 buf[7] = 0; 1582 1583 /* disable reading modem signals automatically */ 1584 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1585 buf[9] = priv->dp_port_num; 1586 buf[10] = DIGI_DISABLE; 1587 buf[11] = 0; 1588 1589 /* disable receive */ 1590 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1591 buf[13] = priv->dp_port_num; 1592 buf[14] = DIGI_DISABLE; 1593 buf[15] = 0; 1594 1595 /* flush fifos */ 1596 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1597 buf[17] = priv->dp_port_num; 1598 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1599 buf[19] = 0; 1600 1601 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 ) 1602 dbg( "digi_close: write oob failed, ret=%d", ret ); 1603 1604 /* wait for final commands on oob port to complete */ 1605 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE); 1606 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1607 finish_wait(&priv->dp_flush_wait, &wait); 1608 1609 /* shutdown any outstanding bulk writes */ 1610 usb_kill_urb(port->write_urb); 1611 } 1612 1613 tty->closing = 0; 1614 1615 exit: 1616 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1617 priv->dp_write_urb_in_use = 0; 1618 priv->dp_in_close = 0; 1619 wake_up_interruptible( &priv->dp_close_wait ); 1620 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1621 1622 dbg( "digi_close: done" ); 1623 } 1624 1625 1626 /* 1627 * Digi Startup Device 1628 * 1629 * Starts reads on all ports. Must be called AFTER startup, with 1630 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1631 */ 1632 1633 static int digi_startup_device( struct usb_serial *serial ) 1634 { 1635 1636 int i,ret = 0; 1637 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1638 struct usb_serial_port *port; 1639 1640 1641 /* be sure this happens exactly once */ 1642 spin_lock( &serial_priv->ds_serial_lock ); 1643 if( serial_priv->ds_device_started ) { 1644 spin_unlock( &serial_priv->ds_serial_lock ); 1645 return( 0 ); 1646 } 1647 serial_priv->ds_device_started = 1; 1648 spin_unlock( &serial_priv->ds_serial_lock ); 1649 1650 /* start reading from each bulk in endpoint for the device */ 1651 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1652 for( i=0; i<serial->type->num_ports+1; i++ ) { 1653 1654 port = serial->port[i]; 1655 1656 port->write_urb->dev = port->serial->dev; 1657 1658 if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) { 1659 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1660 ret, i ); 1661 break; 1662 } 1663 1664 } 1665 1666 return( ret ); 1667 1668 } 1669 1670 1671 static int digi_startup( struct usb_serial *serial ) 1672 { 1673 1674 int i; 1675 struct digi_port *priv; 1676 struct digi_serial *serial_priv; 1677 1678 1679 dbg( "digi_startup: TOP" ); 1680 1681 /* allocate the private data structures for all ports */ 1682 /* number of regular ports + 1 for the out-of-band port */ 1683 for( i=0; i<serial->type->num_ports+1; i++ ) { 1684 1685 /* allocate port private structure */ 1686 priv = (struct digi_port *)kmalloc( sizeof(struct digi_port), 1687 GFP_KERNEL ); 1688 if( priv == (struct digi_port *)0 ) { 1689 while( --i >= 0 ) 1690 kfree( usb_get_serial_port_data(serial->port[i]) ); 1691 return( 1 ); /* error */ 1692 } 1693 1694 /* initialize port private structure */ 1695 spin_lock_init( &priv->dp_port_lock ); 1696 priv->dp_port_num = i; 1697 priv->dp_out_buf_len = 0; 1698 priv->dp_in_buf_len = 0; 1699 priv->dp_write_urb_in_use = 0; 1700 priv->dp_modem_signals = 0; 1701 init_waitqueue_head( &priv->dp_modem_change_wait ); 1702 priv->dp_transmit_idle = 0; 1703 init_waitqueue_head( &priv->dp_transmit_idle_wait ); 1704 priv->dp_throttled = 0; 1705 priv->dp_throttle_restart = 0; 1706 init_waitqueue_head( &priv->dp_flush_wait ); 1707 priv->dp_in_close = 0; 1708 init_waitqueue_head( &priv->dp_close_wait ); 1709 INIT_WORK(&priv->dp_wakeup_work, 1710 digi_wakeup_write_lock, serial->port[i]); 1711 1712 /* initialize write wait queue for this port */ 1713 init_waitqueue_head( &serial->port[i]->write_wait ); 1714 1715 usb_set_serial_port_data(serial->port[i], priv); 1716 } 1717 1718 /* allocate serial private structure */ 1719 serial_priv = (struct digi_serial *)kmalloc( sizeof(struct digi_serial), 1720 GFP_KERNEL ); 1721 if( serial_priv == (struct digi_serial *)0 ) { 1722 for( i=0; i<serial->type->num_ports+1; i++ ) 1723 kfree( usb_get_serial_port_data(serial->port[i]) ); 1724 return( 1 ); /* error */ 1725 } 1726 1727 /* initialize serial private structure */ 1728 spin_lock_init( &serial_priv->ds_serial_lock ); 1729 serial_priv->ds_oob_port_num = serial->type->num_ports; 1730 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1731 serial_priv->ds_device_started = 0; 1732 usb_set_serial_data(serial, serial_priv); 1733 1734 return( 0 ); 1735 1736 } 1737 1738 1739 static void digi_shutdown( struct usb_serial *serial ) 1740 { 1741 1742 int i; 1743 1744 1745 dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() ); 1746 1747 /* stop reads and writes on all ports */ 1748 for( i=0; i<serial->type->num_ports+1; i++ ) { 1749 usb_kill_urb(serial->port[i]->read_urb); 1750 usb_kill_urb(serial->port[i]->write_urb); 1751 } 1752 1753 /* free the private data structures for all ports */ 1754 /* number of regular ports + 1 for the out-of-band port */ 1755 for( i=0; i<serial->type->num_ports+1; i++ ) 1756 kfree( usb_get_serial_port_data(serial->port[i]) ); 1757 kfree( usb_get_serial_data(serial) ); 1758 } 1759 1760 1761 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs ) 1762 { 1763 1764 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1765 struct digi_port *priv; 1766 struct digi_serial *serial_priv; 1767 int ret; 1768 1769 1770 dbg( "digi_read_bulk_callback: TOP" ); 1771 1772 /* port sanity check, do not resubmit if port is not valid */ 1773 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1774 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1775 urb->status ); 1776 return; 1777 } 1778 if( port->serial == NULL 1779 || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) { 1780 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1781 return; 1782 } 1783 1784 /* do not resubmit urb if it has any status error */ 1785 if( urb->status ) { 1786 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num ); 1787 return; 1788 } 1789 1790 /* handle oob or inb callback, do not resubmit if error */ 1791 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1792 if( digi_read_oob_callback( urb ) != 0 ) 1793 return; 1794 } else { 1795 if( digi_read_inb_callback( urb ) != 0 ) 1796 return; 1797 } 1798 1799 /* continue read */ 1800 urb->dev = port->serial->dev; 1801 if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) { 1802 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__, 1803 ret, priv->dp_port_num ); 1804 } 1805 1806 } 1807 1808 1809 /* 1810 * Digi Read INB Callback 1811 * 1812 * Digi Read INB Callback handles reads on the in band ports, sending 1813 * the data on to the tty subsystem. When called we know port and 1814 * port->private are not NULL and port->serial has been validated. 1815 * It returns 0 if successful, 1 if successful but the port is 1816 * throttled, and -1 if the sanity checks failed. 1817 */ 1818 1819 static int digi_read_inb_callback( struct urb *urb ) 1820 { 1821 1822 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1823 struct tty_struct *tty = port->tty; 1824 struct digi_port *priv = usb_get_serial_port_data(port); 1825 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1826 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1827 int status = ((unsigned char *)urb->transfer_buffer)[2]; 1828 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3; 1829 int flag,throttled; 1830 1831 /* do not process callbacks on closed ports */ 1832 /* but do continue the read chain */ 1833 if( port->open_count == 0 ) 1834 return( 0 ); 1835 1836 /* short/multiple packet check */ 1837 if( urb->actual_length != len + 2 ) { 1838 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 ); 1839 return( -1 ); 1840 } 1841 1842 spin_lock( &priv->dp_port_lock ); 1843 1844 /* check for throttle; if set, do not resubmit read urb */ 1845 /* indicate the read chain needs to be restarted on unthrottle */ 1846 throttled = priv->dp_throttled; 1847 if( throttled ) 1848 priv->dp_throttle_restart = 1; 1849 1850 /* receive data */ 1851 if( opcode == DIGI_CMD_RECEIVE_DATA ) { 1852 1853 /* get flag from status */ 1854 flag = 0; 1855 1856 /* overrun is special, not associated with a char */ 1857 if( status & DIGI_OVERRUN_ERROR ) { 1858 tty_insert_flip_char( tty, 0, TTY_OVERRUN ); 1859 } 1860 1861 /* break takes precedence over parity, */ 1862 /* which takes precedence over framing errors */ 1863 if( status & DIGI_BREAK_ERROR ) { 1864 flag = TTY_BREAK; 1865 } else if( status & DIGI_PARITY_ERROR ) { 1866 flag = TTY_PARITY; 1867 } else if( status & DIGI_FRAMING_ERROR ) { 1868 flag = TTY_FRAME; 1869 } 1870 1871 /* data length is len-1 (one byte of len is status) */ 1872 --len; 1873 1874 if( throttled ) { 1875 1876 len = min( len, 1877 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len ); 1878 1879 if( len > 0 ) { 1880 memcpy( priv->dp_in_buf + priv->dp_in_buf_len, 1881 data, len ); 1882 memset( priv->dp_in_flag_buf 1883 + priv->dp_in_buf_len, flag, len ); 1884 priv->dp_in_buf_len += len; 1885 } 1886 1887 } else { 1888 1889 len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count ); 1890 1891 if( len > 0 ) { 1892 memcpy( tty->flip.char_buf_ptr, data, len ); 1893 memset( tty->flip.flag_buf_ptr, flag, len ); 1894 tty->flip.char_buf_ptr += len; 1895 tty->flip.flag_buf_ptr += len; 1896 tty->flip.count += len; 1897 tty_flip_buffer_push( tty ); 1898 } 1899 1900 } 1901 1902 } 1903 1904 spin_unlock( &priv->dp_port_lock ); 1905 1906 if( opcode == DIGI_CMD_RECEIVE_DISABLE ) { 1907 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ ); 1908 } else if( opcode != DIGI_CMD_RECEIVE_DATA ) { 1909 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode ); 1910 } 1911 1912 return( throttled ? 1 : 0 ); 1913 1914 } 1915 1916 1917 /* 1918 * Digi Read OOB Callback 1919 * 1920 * Digi Read OOB Callback handles reads on the out of band port. 1921 * When called we know port and port->private are not NULL and 1922 * the port->serial is valid. It returns 0 if successful, and 1923 * -1 if the sanity checks failed. 1924 */ 1925 1926 static int digi_read_oob_callback( struct urb *urb ) 1927 { 1928 1929 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1930 struct usb_serial *serial = port->serial; 1931 struct digi_port *priv = usb_get_serial_port_data(port); 1932 int opcode, line, status, val; 1933 int i; 1934 1935 1936 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num, 1937 urb->actual_length ); 1938 1939 /* handle each oob command */ 1940 for( i=0; i<urb->actual_length-3; ) { 1941 1942 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1943 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1944 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1945 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1946 1947 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", 1948 opcode, line, status, val ); 1949 1950 if( status != 0 || line >= serial->type->num_ports ) 1951 continue; 1952 1953 port = serial->port[line]; 1954 1955 if ((priv=usb_get_serial_port_data(port)) == NULL ) 1956 return -1; 1957 1958 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) { 1959 1960 spin_lock( &priv->dp_port_lock ); 1961 1962 /* convert from digi flags to termiox flags */ 1963 if( val & DIGI_READ_INPUT_SIGNALS_CTS ) { 1964 priv->dp_modem_signals |= TIOCM_CTS; 1965 /* port must be open to use tty struct */ 1966 if( port->open_count 1967 && port->tty->termios->c_cflag & CRTSCTS ) { 1968 port->tty->hw_stopped = 0; 1969 digi_wakeup_write( port ); 1970 } 1971 } else { 1972 priv->dp_modem_signals &= ~TIOCM_CTS; 1973 /* port must be open to use tty struct */ 1974 if( port->open_count 1975 && port->tty->termios->c_cflag & CRTSCTS ) { 1976 port->tty->hw_stopped = 1; 1977 } 1978 } 1979 if( val & DIGI_READ_INPUT_SIGNALS_DSR ) 1980 priv->dp_modem_signals |= TIOCM_DSR; 1981 else 1982 priv->dp_modem_signals &= ~TIOCM_DSR; 1983 if( val & DIGI_READ_INPUT_SIGNALS_RI ) 1984 priv->dp_modem_signals |= TIOCM_RI; 1985 else 1986 priv->dp_modem_signals &= ~TIOCM_RI; 1987 if( val & DIGI_READ_INPUT_SIGNALS_DCD ) 1988 priv->dp_modem_signals |= TIOCM_CD; 1989 else 1990 priv->dp_modem_signals &= ~TIOCM_CD; 1991 1992 wake_up_interruptible( &priv->dp_modem_change_wait ); 1993 spin_unlock( &priv->dp_port_lock ); 1994 1995 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) { 1996 1997 spin_lock( &priv->dp_port_lock ); 1998 priv->dp_transmit_idle = 1; 1999 wake_up_interruptible( &priv->dp_transmit_idle_wait ); 2000 spin_unlock( &priv->dp_port_lock ); 2001 2002 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) { 2003 2004 wake_up_interruptible( &priv->dp_flush_wait ); 2005 2006 } 2007 2008 } 2009 2010 return( 0 ); 2011 2012 } 2013 2014 2015 static int __init digi_init (void) 2016 { 2017 int retval; 2018 retval = usb_serial_register(&digi_acceleport_2_device); 2019 if (retval) 2020 goto failed_acceleport_2_device; 2021 retval = usb_serial_register(&digi_acceleport_4_device); 2022 if (retval) 2023 goto failed_acceleport_4_device; 2024 retval = usb_register(&digi_driver); 2025 if (retval) 2026 goto failed_usb_register; 2027 info(DRIVER_VERSION ":" DRIVER_DESC); 2028 return 0; 2029 failed_usb_register: 2030 usb_serial_deregister(&digi_acceleport_4_device); 2031 failed_acceleport_4_device: 2032 usb_serial_deregister(&digi_acceleport_2_device); 2033 failed_acceleport_2_device: 2034 return retval; 2035 } 2036 2037 2038 static void __exit digi_exit (void) 2039 { 2040 usb_deregister (&digi_driver); 2041 usb_serial_deregister (&digi_acceleport_2_device); 2042 usb_serial_deregister (&digi_acceleport_4_device); 2043 } 2044 2045 2046 module_init(digi_init); 2047 module_exit(digi_exit); 2048 2049 2050 MODULE_AUTHOR( DRIVER_AUTHOR ); 2051 MODULE_DESCRIPTION( DRIVER_DESC ); 2052 MODULE_LICENSE("GPL"); 2053 2054 module_param(debug, bool, S_IRUGO | S_IWUSR); 2055 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2056