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_device_type digi_acceleport_2_device = { 507 .owner = THIS_MODULE, 508 .name = "Digi 2 port USB adapter", 509 .short_name = "digi_2", 510 .id_table = id_table_2, 511 .num_interrupt_in = 0, 512 .num_bulk_in = 4, 513 .num_bulk_out = 4, 514 .num_ports = 3, 515 .open = digi_open, 516 .close = digi_close, 517 .write = digi_write, 518 .write_room = digi_write_room, 519 .write_bulk_callback = digi_write_bulk_callback, 520 .read_bulk_callback = digi_read_bulk_callback, 521 .chars_in_buffer = digi_chars_in_buffer, 522 .throttle = digi_rx_throttle, 523 .unthrottle = digi_rx_unthrottle, 524 .ioctl = digi_ioctl, 525 .set_termios = digi_set_termios, 526 .break_ctl = digi_break_ctl, 527 .tiocmget = digi_tiocmget, 528 .tiocmset = digi_tiocmset, 529 .attach = digi_startup, 530 .shutdown = digi_shutdown, 531 }; 532 533 static struct usb_serial_device_type digi_acceleport_4_device = { 534 .owner = THIS_MODULE, 535 .name = "Digi 4 port USB adapter", 536 .short_name = "digi_4", 537 .id_table = id_table_4, 538 .num_interrupt_in = 0, 539 .num_bulk_in = 5, 540 .num_bulk_out = 5, 541 .num_ports = 4, 542 .open = digi_open, 543 .close = digi_close, 544 .write = digi_write, 545 .write_room = digi_write_room, 546 .write_bulk_callback = digi_write_bulk_callback, 547 .read_bulk_callback = digi_read_bulk_callback, 548 .chars_in_buffer = digi_chars_in_buffer, 549 .throttle = digi_rx_throttle, 550 .unthrottle = digi_rx_unthrottle, 551 .ioctl = digi_ioctl, 552 .set_termios = digi_set_termios, 553 .break_ctl = digi_break_ctl, 554 .tiocmget = digi_tiocmget, 555 .tiocmset = digi_tiocmset, 556 .attach = digi_startup, 557 .shutdown = digi_shutdown, 558 }; 559 560 561 /* Functions */ 562 563 /* 564 * Cond Wait Interruptible Timeout Irqrestore 565 * 566 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 567 * so that wake ups are not lost if they occur between the unlock 568 * and the sleep. In other words, spin_unlock_irqrestore and 569 * interruptible_sleep_on_timeout are "atomic" with respect to 570 * wake ups. This is used to implement condition variables. 571 */ 572 573 static inline long cond_wait_interruptible_timeout_irqrestore( 574 wait_queue_head_t *q, long timeout, 575 spinlock_t *lock, unsigned long flags ) 576 { 577 DEFINE_WAIT(wait); 578 579 prepare_to_wait(q, &wait, TASK_UNINTERRUPTIBLE); 580 spin_unlock_irqrestore(lock, flags); 581 timeout = schedule_timeout(timeout); 582 finish_wait(q, &wait); 583 584 return timeout; 585 586 } 587 588 589 /* 590 * Digi Wakeup Write 591 * 592 * Wake up port, line discipline, and tty processes sleeping 593 * on writes. 594 */ 595 596 static void digi_wakeup_write_lock(void *arg) 597 { 598 struct usb_serial_port *port = arg; 599 unsigned long flags; 600 struct digi_port *priv = usb_get_serial_port_data(port); 601 602 603 spin_lock_irqsave( &priv->dp_port_lock, flags ); 604 digi_wakeup_write( port ); 605 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 606 } 607 608 static void digi_wakeup_write( struct usb_serial_port *port ) 609 { 610 611 struct tty_struct *tty = port->tty; 612 613 614 /* wake up port processes */ 615 wake_up_interruptible( &port->write_wait ); 616 617 /* wake up line discipline */ 618 tty_wakeup(tty); 619 } 620 621 622 /* 623 * Digi Write OOB Command 624 * 625 * Write commands on the out of band port. Commands are 4 626 * bytes each, multiple commands can be sent at once, and 627 * no command will be split across USB packets. Returns 0 628 * if successful, -EINTR if interrupted while sleeping and 629 * the interruptible flag is true, or a negative error 630 * returned by usb_submit_urb. 631 */ 632 633 static int digi_write_oob_command( struct usb_serial_port *port, 634 unsigned char *buf, int count, int interruptible ) 635 { 636 637 int ret = 0; 638 int len; 639 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 640 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 641 unsigned long flags = 0; 642 643 644 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count ); 645 646 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 647 648 while( count > 0 ) { 649 650 while( oob_port->write_urb->status == -EINPROGRESS 651 || oob_priv->dp_write_urb_in_use ) { 652 cond_wait_interruptible_timeout_irqrestore( 653 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 654 &oob_priv->dp_port_lock, flags ); 655 if( interruptible && signal_pending(current) ) { 656 return( -EINTR ); 657 } 658 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 659 } 660 661 /* len must be a multiple of 4, so commands are not split */ 662 len = min(count, oob_port->bulk_out_size ); 663 if( len > 4 ) 664 len &= ~3; 665 666 memcpy( oob_port->write_urb->transfer_buffer, buf, len ); 667 oob_port->write_urb->transfer_buffer_length = len; 668 oob_port->write_urb->dev = port->serial->dev; 669 670 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 671 oob_priv->dp_write_urb_in_use = 1; 672 count -= len; 673 buf += len; 674 } 675 676 } 677 678 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 679 680 if( ret ) { 681 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 682 ret ); 683 } 684 685 return( ret ); 686 687 } 688 689 690 /* 691 * Digi Write In Band Command 692 * 693 * Write commands on the given port. Commands are 4 694 * bytes each, multiple commands can be sent at once, and 695 * no command will be split across USB packets. If timeout 696 * is non-zero, write in band command will return after 697 * waiting unsuccessfully for the URB status to clear for 698 * timeout ticks. Returns 0 if successful, or a negative 699 * error returned by digi_write. 700 */ 701 702 static int digi_write_inb_command( struct usb_serial_port *port, 703 unsigned char *buf, int count, unsigned long timeout ) 704 { 705 706 int ret = 0; 707 int len; 708 struct digi_port *priv = usb_get_serial_port_data(port); 709 unsigned char *data = port->write_urb->transfer_buffer; 710 unsigned long flags = 0; 711 712 713 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num, 714 count ); 715 716 if( timeout ) 717 timeout += jiffies; 718 else 719 timeout = ULONG_MAX; 720 721 spin_lock_irqsave( &priv->dp_port_lock, flags ); 722 723 while( count > 0 && ret == 0 ) { 724 725 while( (port->write_urb->status == -EINPROGRESS 726 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) { 727 cond_wait_interruptible_timeout_irqrestore( 728 &port->write_wait, DIGI_RETRY_TIMEOUT, 729 &priv->dp_port_lock, flags ); 730 if( signal_pending(current) ) { 731 return( -EINTR ); 732 } 733 spin_lock_irqsave( &priv->dp_port_lock, flags ); 734 } 735 736 /* len must be a multiple of 4 and small enough to */ 737 /* guarantee the write will send buffered data first, */ 738 /* so commands are in order with data and not split */ 739 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len ); 740 if( len > 4 ) 741 len &= ~3; 742 743 /* write any buffered data first */ 744 if( priv->dp_out_buf_len > 0 ) { 745 data[0] = DIGI_CMD_SEND_DATA; 746 data[1] = priv->dp_out_buf_len; 747 memcpy( data+2, priv->dp_out_buf, 748 priv->dp_out_buf_len ); 749 memcpy( data+2+priv->dp_out_buf_len, buf, len ); 750 port->write_urb->transfer_buffer_length 751 = priv->dp_out_buf_len+2+len; 752 } else { 753 memcpy( data, buf, len ); 754 port->write_urb->transfer_buffer_length = len; 755 } 756 port->write_urb->dev = port->serial->dev; 757 758 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 759 priv->dp_write_urb_in_use = 1; 760 priv->dp_out_buf_len = 0; 761 count -= len; 762 buf += len; 763 } 764 765 } 766 767 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 768 769 if( ret ) { 770 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 771 ret, priv->dp_port_num ); 772 } 773 774 return( ret ); 775 776 } 777 778 779 /* 780 * Digi Set Modem Signals 781 * 782 * Sets or clears DTR and RTS on the port, according to the 783 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 784 * for the modem_signals argument. Returns 0 if successful, 785 * -EINTR if interrupted while sleeping, or a non-zero error 786 * returned by usb_submit_urb. 787 */ 788 789 static int digi_set_modem_signals( struct usb_serial_port *port, 790 unsigned int modem_signals, int interruptible ) 791 { 792 793 int ret; 794 struct digi_port *port_priv = usb_get_serial_port_data(port); 795 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 796 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 797 unsigned char *data = oob_port->write_urb->transfer_buffer; 798 unsigned long flags = 0; 799 800 801 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", 802 port_priv->dp_port_num, modem_signals ); 803 804 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 805 spin_lock( &port_priv->dp_port_lock ); 806 807 while( oob_port->write_urb->status == -EINPROGRESS 808 || oob_priv->dp_write_urb_in_use ) { 809 spin_unlock( &port_priv->dp_port_lock ); 810 cond_wait_interruptible_timeout_irqrestore( 811 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 812 &oob_priv->dp_port_lock, flags ); 813 if( interruptible && signal_pending(current) ) { 814 return( -EINTR ); 815 } 816 spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); 817 spin_lock( &port_priv->dp_port_lock ); 818 } 819 820 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 821 data[1] = port_priv->dp_port_num; 822 data[2] = (modem_signals&TIOCM_DTR) ? 823 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 824 data[3] = 0; 825 826 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 827 data[5] = port_priv->dp_port_num; 828 data[6] = (modem_signals&TIOCM_RTS) ? 829 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 830 data[7] = 0; 831 832 oob_port->write_urb->transfer_buffer_length = 8; 833 oob_port->write_urb->dev = port->serial->dev; 834 835 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { 836 oob_priv->dp_write_urb_in_use = 1; 837 port_priv->dp_modem_signals = 838 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 839 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 840 } 841 842 spin_unlock( &port_priv->dp_port_lock ); 843 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); 844 845 if( ret ) { 846 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 847 ret ); 848 } 849 850 return( ret ); 851 852 } 853 854 855 /* 856 * Digi Transmit Idle 857 * 858 * Digi transmit idle waits, up to timeout ticks, for the transmitter 859 * to go idle. It returns 0 if successful or a negative error. 860 * 861 * There are race conditions here if more than one process is calling 862 * digi_transmit_idle on the same port at the same time. However, this 863 * is only called from close, and only one process can be in close on a 864 * port at a time, so its ok. 865 */ 866 867 static int digi_transmit_idle( struct usb_serial_port *port, 868 unsigned long timeout ) 869 { 870 871 int ret; 872 unsigned char buf[2]; 873 struct digi_port *priv = usb_get_serial_port_data(port); 874 unsigned long flags = 0; 875 876 877 spin_lock_irqsave( &priv->dp_port_lock, flags ); 878 priv->dp_transmit_idle = 0; 879 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 880 881 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 882 buf[1] = 0; 883 884 timeout += jiffies; 885 886 if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 ) 887 return( ret ); 888 889 spin_lock_irqsave( &priv->dp_port_lock, flags ); 890 891 while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) { 892 cond_wait_interruptible_timeout_irqrestore( 893 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 894 &priv->dp_port_lock, flags ); 895 if( signal_pending(current) ) { 896 return( -EINTR ); 897 } 898 spin_lock_irqsave( &priv->dp_port_lock, flags ); 899 } 900 901 priv->dp_transmit_idle = 0; 902 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 903 904 return( 0 ); 905 906 } 907 908 909 static void digi_rx_throttle( struct usb_serial_port *port ) 910 { 911 912 unsigned long flags; 913 struct digi_port *priv = usb_get_serial_port_data(port); 914 915 916 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num ); 917 918 /* stop receiving characters by not resubmitting the read urb */ 919 spin_lock_irqsave( &priv->dp_port_lock, flags ); 920 priv->dp_throttled = 1; 921 priv->dp_throttle_restart = 0; 922 priv->dp_in_buf_len = 0; 923 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 924 925 } 926 927 928 static void digi_rx_unthrottle( struct usb_serial_port *port ) 929 { 930 931 int ret = 0; 932 int len; 933 unsigned long flags; 934 struct digi_port *priv = usb_get_serial_port_data(port); 935 struct tty_struct *tty = port->tty; 936 937 938 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num ); 939 940 spin_lock_irqsave( &priv->dp_port_lock, flags ); 941 942 /* send any buffered chars from throttle time on to tty subsystem */ 943 len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count ); 944 if( len > 0 ) { 945 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len ); 946 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len ); 947 tty->flip.char_buf_ptr += len; 948 tty->flip.flag_buf_ptr += len; 949 tty->flip.count += len; 950 tty_flip_buffer_push( tty ); 951 } 952 953 /* restart read chain */ 954 if( priv->dp_throttle_restart ) { 955 port->read_urb->dev = port->serial->dev; 956 ret = usb_submit_urb( port->read_urb, GFP_ATOMIC ); 957 } 958 959 /* turn throttle off */ 960 priv->dp_throttled = 0; 961 priv->dp_in_buf_len = 0; 962 priv->dp_throttle_restart = 0; 963 964 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 965 966 if( ret ) { 967 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 968 ret, priv->dp_port_num ); 969 } 970 971 } 972 973 974 static void digi_set_termios( struct usb_serial_port *port, 975 struct termios *old_termios ) 976 { 977 978 struct digi_port *priv = usb_get_serial_port_data(port); 979 unsigned int iflag = port->tty->termios->c_iflag; 980 unsigned int cflag = port->tty->termios->c_cflag; 981 unsigned int old_iflag = old_termios->c_iflag; 982 unsigned int old_cflag = old_termios->c_cflag; 983 unsigned char buf[32]; 984 unsigned int modem_signals; 985 int arg,ret; 986 int i = 0; 987 988 989 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 ); 990 991 /* set baud rate */ 992 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) { 993 994 arg = -1; 995 996 /* reassert DTR and (maybe) RTS on transition from B0 */ 997 if( (old_cflag&CBAUD) == B0 ) { 998 /* don't set RTS if using hardware flow control */ 999 /* and throttling input */ 1000 modem_signals = TIOCM_DTR; 1001 if( !(port->tty->termios->c_cflag & CRTSCTS) || 1002 !test_bit(TTY_THROTTLED, &port->tty->flags) ) { 1003 modem_signals |= TIOCM_RTS; 1004 } 1005 digi_set_modem_signals( port, modem_signals, 1 ); 1006 } 1007 1008 switch( (cflag&CBAUD) ) { 1009 /* drop DTR and RTS on transition to B0 */ 1010 case B0: digi_set_modem_signals( port, 0, 1 ); break; 1011 case B50: arg = DIGI_BAUD_50; break; 1012 case B75: arg = DIGI_BAUD_75; break; 1013 case B110: arg = DIGI_BAUD_110; break; 1014 case B150: arg = DIGI_BAUD_150; break; 1015 case B200: arg = DIGI_BAUD_200; break; 1016 case B300: arg = DIGI_BAUD_300; break; 1017 case B600: arg = DIGI_BAUD_600; break; 1018 case B1200: arg = DIGI_BAUD_1200; break; 1019 case B1800: arg = DIGI_BAUD_1800; break; 1020 case B2400: arg = DIGI_BAUD_2400; break; 1021 case B4800: arg = DIGI_BAUD_4800; break; 1022 case B9600: arg = DIGI_BAUD_9600; break; 1023 case B19200: arg = DIGI_BAUD_19200; break; 1024 case B38400: arg = DIGI_BAUD_38400; break; 1025 case B57600: arg = DIGI_BAUD_57600; break; 1026 case B115200: arg = DIGI_BAUD_115200; break; 1027 case B230400: arg = DIGI_BAUD_230400; break; 1028 case B460800: arg = DIGI_BAUD_460800; break; 1029 default: 1030 dbg( "digi_set_termios: can't handle baud rate 0x%x", 1031 (cflag&CBAUD) ); 1032 break; 1033 } 1034 1035 if( arg != -1 ) { 1036 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 1037 buf[i++] = priv->dp_port_num; 1038 buf[i++] = arg; 1039 buf[i++] = 0; 1040 } 1041 1042 } 1043 1044 /* set parity */ 1045 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) { 1046 1047 if( (cflag&PARENB) ) { 1048 if( (cflag&PARODD) ) 1049 arg = DIGI_PARITY_ODD; 1050 else 1051 arg = DIGI_PARITY_EVEN; 1052 } else { 1053 arg = DIGI_PARITY_NONE; 1054 } 1055 1056 buf[i++] = DIGI_CMD_SET_PARITY; 1057 buf[i++] = priv->dp_port_num; 1058 buf[i++] = arg; 1059 buf[i++] = 0; 1060 1061 } 1062 1063 /* set word size */ 1064 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) { 1065 1066 arg = -1; 1067 1068 switch( (cflag&CSIZE) ) { 1069 case CS5: arg = DIGI_WORD_SIZE_5; break; 1070 case CS6: arg = DIGI_WORD_SIZE_6; break; 1071 case CS7: arg = DIGI_WORD_SIZE_7; break; 1072 case CS8: arg = DIGI_WORD_SIZE_8; break; 1073 default: 1074 dbg( "digi_set_termios: can't handle word size %d", 1075 (cflag&CSIZE) ); 1076 break; 1077 } 1078 1079 if( arg != -1 ) { 1080 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 1081 buf[i++] = priv->dp_port_num; 1082 buf[i++] = arg; 1083 buf[i++] = 0; 1084 } 1085 1086 } 1087 1088 /* set stop bits */ 1089 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) { 1090 1091 if( (cflag&CSTOPB) ) 1092 arg = DIGI_STOP_BITS_2; 1093 else 1094 arg = DIGI_STOP_BITS_1; 1095 1096 buf[i++] = DIGI_CMD_SET_STOP_BITS; 1097 buf[i++] = priv->dp_port_num; 1098 buf[i++] = arg; 1099 buf[i++] = 0; 1100 1101 } 1102 1103 /* set input flow control */ 1104 if( (iflag&IXOFF) != (old_iflag&IXOFF) 1105 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1106 1107 arg = 0; 1108 1109 if( (iflag&IXOFF) ) 1110 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1111 else 1112 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1113 1114 if( (cflag&CRTSCTS) ) { 1115 1116 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 1117 1118 /* On USB-4 it is necessary to assert RTS prior */ 1119 /* to selecting RTS input flow control. */ 1120 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 1121 buf[i++] = priv->dp_port_num; 1122 buf[i++] = DIGI_RTS_ACTIVE; 1123 buf[i++] = 0; 1124 1125 } else { 1126 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 1127 } 1128 1129 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1130 buf[i++] = priv->dp_port_num; 1131 buf[i++] = arg; 1132 buf[i++] = 0; 1133 1134 } 1135 1136 /* set output flow control */ 1137 if( (iflag&IXON) != (old_iflag&IXON) 1138 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { 1139 1140 arg = 0; 1141 1142 if( (iflag&IXON) ) 1143 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1144 else 1145 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1146 1147 if( (cflag&CRTSCTS) ) { 1148 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 1149 } else { 1150 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 1151 port->tty->hw_stopped = 0; 1152 } 1153 1154 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1155 buf[i++] = priv->dp_port_num; 1156 buf[i++] = arg; 1157 buf[i++] = 0; 1158 1159 } 1160 1161 /* set receive enable/disable */ 1162 if( (cflag&CREAD) != (old_cflag&CREAD) ) { 1163 1164 if( (cflag&CREAD) ) 1165 arg = DIGI_ENABLE; 1166 else 1167 arg = DIGI_DISABLE; 1168 1169 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 1170 buf[i++] = priv->dp_port_num; 1171 buf[i++] = arg; 1172 buf[i++] = 0; 1173 1174 } 1175 1176 if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 ) 1177 dbg( "digi_set_termios: write oob failed, ret=%d", ret ); 1178 1179 } 1180 1181 1182 static void digi_break_ctl( struct usb_serial_port *port, int break_state ) 1183 { 1184 1185 unsigned char buf[4]; 1186 1187 1188 buf[0] = DIGI_CMD_BREAK_CONTROL; 1189 buf[1] = 2; /* length */ 1190 buf[2] = break_state ? 1 : 0; 1191 buf[3] = 0; /* pad */ 1192 1193 digi_write_inb_command( port, buf, 4, 0 ); 1194 1195 } 1196 1197 1198 static int digi_tiocmget( struct usb_serial_port *port, struct file *file ) 1199 { 1200 struct digi_port *priv = usb_get_serial_port_data(port); 1201 unsigned int val; 1202 unsigned long flags; 1203 1204 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1205 1206 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1207 val = priv->dp_modem_signals; 1208 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1209 return val; 1210 } 1211 1212 1213 static int digi_tiocmset( struct usb_serial_port *port, struct file *file, 1214 unsigned int set, unsigned int clear ) 1215 { 1216 struct digi_port *priv = usb_get_serial_port_data(port); 1217 unsigned int val; 1218 unsigned long flags; 1219 1220 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); 1221 1222 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1223 val = (priv->dp_modem_signals & ~clear) | set; 1224 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1225 return digi_set_modem_signals( port, val, 1 ); 1226 } 1227 1228 1229 static int digi_ioctl( struct usb_serial_port *port, struct file *file, 1230 unsigned int cmd, unsigned long arg ) 1231 { 1232 1233 struct digi_port *priv = usb_get_serial_port_data(port); 1234 1235 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd ); 1236 1237 switch (cmd) { 1238 1239 case TIOCMIWAIT: 1240 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/ 1241 /* TODO */ 1242 return( 0 ); 1243 1244 case TIOCGICOUNT: 1245 /* return count of modemline transitions */ 1246 /* TODO */ 1247 return 0; 1248 1249 } 1250 1251 return( -ENOIOCTLCMD ); 1252 1253 } 1254 1255 1256 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ) 1257 { 1258 1259 int ret,data_len,new_len; 1260 struct digi_port *priv = usb_get_serial_port_data(port); 1261 unsigned char *data = port->write_urb->transfer_buffer; 1262 unsigned long flags = 0; 1263 1264 1265 dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", 1266 priv->dp_port_num, count, in_interrupt() ); 1267 1268 /* copy user data (which can sleep) before getting spin lock */ 1269 count = min( count, port->bulk_out_size-2 ); 1270 count = min( 64, count); 1271 1272 /* be sure only one write proceeds at a time */ 1273 /* there are races on the port private buffer */ 1274 /* and races to check write_urb->status */ 1275 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1276 1277 /* wait for urb status clear to submit another urb */ 1278 if( port->write_urb->status == -EINPROGRESS 1279 || priv->dp_write_urb_in_use ) { 1280 1281 /* buffer data if count is 1 (probably put_char) if possible */ 1282 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) { 1283 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 1284 new_len = 1; 1285 } else { 1286 new_len = 0; 1287 } 1288 1289 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1290 1291 return( new_len ); 1292 1293 } 1294 1295 /* allow space for any buffered data and for new data, up to */ 1296 /* transfer buffer size - 2 (for command and length bytes) */ 1297 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 1298 data_len = new_len + priv->dp_out_buf_len; 1299 1300 if( data_len == 0 ) { 1301 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1302 return( 0 ); 1303 } 1304 1305 port->write_urb->transfer_buffer_length = data_len+2; 1306 port->write_urb->dev = port->serial->dev; 1307 1308 *data++ = DIGI_CMD_SEND_DATA; 1309 *data++ = data_len; 1310 1311 /* copy in buffered data first */ 1312 memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len ); 1313 data += priv->dp_out_buf_len; 1314 1315 /* copy in new data */ 1316 memcpy( data, buf, new_len ); 1317 1318 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1319 priv->dp_write_urb_in_use = 1; 1320 ret = new_len; 1321 priv->dp_out_buf_len = 0; 1322 } 1323 1324 /* return length of new data written, or error */ 1325 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1326 if( ret < 0 ) { 1327 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1328 ret, priv->dp_port_num ); 1329 } 1330 1331 dbg( "digi_write: returning %d", ret ); 1332 return( ret ); 1333 1334 } 1335 1336 1337 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs ) 1338 { 1339 1340 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1341 struct usb_serial *serial; 1342 struct digi_port *priv; 1343 struct digi_serial *serial_priv; 1344 int ret = 0; 1345 1346 1347 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status ); 1348 1349 /* port and serial sanity check */ 1350 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1351 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1352 urb->status ); 1353 return; 1354 } 1355 serial = port->serial; 1356 if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) { 1357 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1358 return; 1359 } 1360 1361 /* handle oob callback */ 1362 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1363 dbg( "digi_write_bulk_callback: oob callback" ); 1364 spin_lock( &priv->dp_port_lock ); 1365 priv->dp_write_urb_in_use = 0; 1366 wake_up_interruptible( &port->write_wait ); 1367 spin_unlock( &priv->dp_port_lock ); 1368 return; 1369 } 1370 1371 /* try to send any buffered data on this port, if it is open */ 1372 spin_lock( &priv->dp_port_lock ); 1373 priv->dp_write_urb_in_use = 0; 1374 if( port->open_count && port->write_urb->status != -EINPROGRESS 1375 && priv->dp_out_buf_len > 0 ) { 1376 1377 *((unsigned char *)(port->write_urb->transfer_buffer)) 1378 = (unsigned char)DIGI_CMD_SEND_DATA; 1379 *((unsigned char *)(port->write_urb->transfer_buffer)+1) 1380 = (unsigned char)priv->dp_out_buf_len; 1381 1382 port->write_urb->transfer_buffer_length 1383 = priv->dp_out_buf_len+2; 1384 port->write_urb->dev = serial->dev; 1385 1386 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf, 1387 priv->dp_out_buf_len ); 1388 1389 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { 1390 priv->dp_write_urb_in_use = 1; 1391 priv->dp_out_buf_len = 0; 1392 } 1393 1394 } 1395 1396 /* wake up processes sleeping on writes immediately */ 1397 digi_wakeup_write( port ); 1398 1399 /* also queue up a wakeup at scheduler time, in case we */ 1400 /* lost the race in write_chan(). */ 1401 schedule_work(&priv->dp_wakeup_work); 1402 1403 spin_unlock( &priv->dp_port_lock ); 1404 1405 if( ret ) { 1406 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1407 ret, priv->dp_port_num ); 1408 } 1409 1410 } 1411 1412 1413 static int digi_write_room( struct usb_serial_port *port ) 1414 { 1415 1416 int room; 1417 struct digi_port *priv = usb_get_serial_port_data(port); 1418 unsigned long flags = 0; 1419 1420 1421 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1422 1423 if( port->write_urb->status == -EINPROGRESS 1424 || priv->dp_write_urb_in_use ) 1425 room = 0; 1426 else 1427 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1428 1429 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1430 1431 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room ); 1432 return( room ); 1433 1434 } 1435 1436 1437 static int digi_chars_in_buffer( struct usb_serial_port *port ) 1438 { 1439 1440 struct digi_port *priv = usb_get_serial_port_data(port); 1441 1442 1443 if( port->write_urb->status == -EINPROGRESS 1444 || priv->dp_write_urb_in_use ) { 1445 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 ); 1446 /* return( port->bulk_out_size - 2 ); */ 1447 return( 256 ); 1448 } else { 1449 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len ); 1450 return( priv->dp_out_buf_len ); 1451 } 1452 1453 } 1454 1455 1456 static int digi_open( struct usb_serial_port *port, struct file *filp ) 1457 { 1458 1459 int ret; 1460 unsigned char buf[32]; 1461 struct digi_port *priv = usb_get_serial_port_data(port); 1462 struct termios not_termios; 1463 unsigned long flags = 0; 1464 1465 1466 dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1467 1468 /* be sure the device is started up */ 1469 if( digi_startup_device( port->serial ) != 0 ) 1470 return( -ENXIO ); 1471 1472 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1473 1474 /* don't wait on a close in progress for non-blocking opens */ 1475 if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1476 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1477 return( -EAGAIN ); 1478 } 1479 1480 /* wait for a close in progress to finish */ 1481 while( priv->dp_in_close ) { 1482 cond_wait_interruptible_timeout_irqrestore( 1483 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT, 1484 &priv->dp_port_lock, flags ); 1485 if( signal_pending(current) ) { 1486 return( -EINTR ); 1487 } 1488 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1489 } 1490 1491 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1492 1493 /* read modem signals automatically whenever they change */ 1494 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1495 buf[1] = priv->dp_port_num; 1496 buf[2] = DIGI_ENABLE; 1497 buf[3] = 0; 1498 1499 /* flush fifos */ 1500 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1501 buf[5] = priv->dp_port_num; 1502 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1503 buf[7] = 0; 1504 1505 if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 ) 1506 dbg( "digi_open: write oob failed, ret=%d", ret ); 1507 1508 /* set termios settings */ 1509 not_termios.c_cflag = ~port->tty->termios->c_cflag; 1510 not_termios.c_iflag = ~port->tty->termios->c_iflag; 1511 digi_set_termios( port, ¬_termios ); 1512 1513 /* set DTR and RTS */ 1514 digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 ); 1515 1516 return( 0 ); 1517 1518 } 1519 1520 1521 static void digi_close( struct usb_serial_port *port, struct file *filp ) 1522 { 1523 DEFINE_WAIT(wait); 1524 int ret; 1525 unsigned char buf[32]; 1526 struct tty_struct *tty = port->tty; 1527 struct digi_port *priv = usb_get_serial_port_data(port); 1528 unsigned long flags = 0; 1529 1530 1531 dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); 1532 1533 1534 /* if disconnected, just clear flags */ 1535 if (!usb_get_intfdata(port->serial->interface)) 1536 goto exit; 1537 1538 /* do cleanup only after final close on this port */ 1539 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1540 priv->dp_in_close = 1; 1541 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1542 1543 /* tell line discipline to process only XON/XOFF */ 1544 tty->closing = 1; 1545 1546 /* wait for output to drain */ 1547 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1548 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT ); 1549 } 1550 1551 /* flush driver and line discipline buffers */ 1552 if( tty->driver->flush_buffer ) 1553 tty->driver->flush_buffer( tty ); 1554 tty_ldisc_flush(tty); 1555 1556 if (port->serial->dev) { 1557 /* wait for transmit idle */ 1558 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { 1559 digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT ); 1560 } 1561 1562 /* drop DTR and RTS */ 1563 digi_set_modem_signals( port, 0, 0 ); 1564 1565 /* disable input flow control */ 1566 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1567 buf[1] = priv->dp_port_num; 1568 buf[2] = DIGI_DISABLE; 1569 buf[3] = 0; 1570 1571 /* disable output flow control */ 1572 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1573 buf[5] = priv->dp_port_num; 1574 buf[6] = DIGI_DISABLE; 1575 buf[7] = 0; 1576 1577 /* disable reading modem signals automatically */ 1578 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1579 buf[9] = priv->dp_port_num; 1580 buf[10] = DIGI_DISABLE; 1581 buf[11] = 0; 1582 1583 /* disable receive */ 1584 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1585 buf[13] = priv->dp_port_num; 1586 buf[14] = DIGI_DISABLE; 1587 buf[15] = 0; 1588 1589 /* flush fifos */ 1590 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1591 buf[17] = priv->dp_port_num; 1592 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1593 buf[19] = 0; 1594 1595 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 ) 1596 dbg( "digi_close: write oob failed, ret=%d", ret ); 1597 1598 /* wait for final commands on oob port to complete */ 1599 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_UNINTERRUPTIBLE); 1600 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1601 finish_wait(&priv->dp_flush_wait, &wait); 1602 1603 /* shutdown any outstanding bulk writes */ 1604 usb_kill_urb(port->write_urb); 1605 } 1606 1607 tty->closing = 0; 1608 1609 exit: 1610 spin_lock_irqsave( &priv->dp_port_lock, flags ); 1611 priv->dp_write_urb_in_use = 0; 1612 priv->dp_in_close = 0; 1613 wake_up_interruptible( &priv->dp_close_wait ); 1614 spin_unlock_irqrestore( &priv->dp_port_lock, flags ); 1615 1616 dbg( "digi_close: done" ); 1617 } 1618 1619 1620 /* 1621 * Digi Startup Device 1622 * 1623 * Starts reads on all ports. Must be called AFTER startup, with 1624 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1625 */ 1626 1627 static int digi_startup_device( struct usb_serial *serial ) 1628 { 1629 1630 int i,ret = 0; 1631 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1632 struct usb_serial_port *port; 1633 1634 1635 /* be sure this happens exactly once */ 1636 spin_lock( &serial_priv->ds_serial_lock ); 1637 if( serial_priv->ds_device_started ) { 1638 spin_unlock( &serial_priv->ds_serial_lock ); 1639 return( 0 ); 1640 } 1641 serial_priv->ds_device_started = 1; 1642 spin_unlock( &serial_priv->ds_serial_lock ); 1643 1644 /* start reading from each bulk in endpoint for the device */ 1645 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1646 for( i=0; i<serial->type->num_ports+1; i++ ) { 1647 1648 port = serial->port[i]; 1649 1650 port->write_urb->dev = port->serial->dev; 1651 1652 if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) { 1653 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, 1654 ret, i ); 1655 break; 1656 } 1657 1658 } 1659 1660 return( ret ); 1661 1662 } 1663 1664 1665 static int digi_startup( struct usb_serial *serial ) 1666 { 1667 1668 int i; 1669 struct digi_port *priv; 1670 struct digi_serial *serial_priv; 1671 1672 1673 dbg( "digi_startup: TOP" ); 1674 1675 /* allocate the private data structures for all ports */ 1676 /* number of regular ports + 1 for the out-of-band port */ 1677 for( i=0; i<serial->type->num_ports+1; i++ ) { 1678 1679 /* allocate port private structure */ 1680 priv = (struct digi_port *)kmalloc( sizeof(struct digi_port), 1681 GFP_KERNEL ); 1682 if( priv == (struct digi_port *)0 ) { 1683 while( --i >= 0 ) 1684 kfree( usb_get_serial_port_data(serial->port[i]) ); 1685 return( 1 ); /* error */ 1686 } 1687 1688 /* initialize port private structure */ 1689 spin_lock_init( &priv->dp_port_lock ); 1690 priv->dp_port_num = i; 1691 priv->dp_out_buf_len = 0; 1692 priv->dp_in_buf_len = 0; 1693 priv->dp_write_urb_in_use = 0; 1694 priv->dp_modem_signals = 0; 1695 init_waitqueue_head( &priv->dp_modem_change_wait ); 1696 priv->dp_transmit_idle = 0; 1697 init_waitqueue_head( &priv->dp_transmit_idle_wait ); 1698 priv->dp_throttled = 0; 1699 priv->dp_throttle_restart = 0; 1700 init_waitqueue_head( &priv->dp_flush_wait ); 1701 priv->dp_in_close = 0; 1702 init_waitqueue_head( &priv->dp_close_wait ); 1703 INIT_WORK(&priv->dp_wakeup_work, 1704 digi_wakeup_write_lock, serial->port[i]); 1705 1706 /* initialize write wait queue for this port */ 1707 init_waitqueue_head( &serial->port[i]->write_wait ); 1708 1709 usb_set_serial_port_data(serial->port[i], priv); 1710 } 1711 1712 /* allocate serial private structure */ 1713 serial_priv = (struct digi_serial *)kmalloc( sizeof(struct digi_serial), 1714 GFP_KERNEL ); 1715 if( serial_priv == (struct digi_serial *)0 ) { 1716 for( i=0; i<serial->type->num_ports+1; i++ ) 1717 kfree( usb_get_serial_port_data(serial->port[i]) ); 1718 return( 1 ); /* error */ 1719 } 1720 1721 /* initialize serial private structure */ 1722 spin_lock_init( &serial_priv->ds_serial_lock ); 1723 serial_priv->ds_oob_port_num = serial->type->num_ports; 1724 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1725 serial_priv->ds_device_started = 0; 1726 usb_set_serial_data(serial, serial_priv); 1727 1728 return( 0 ); 1729 1730 } 1731 1732 1733 static void digi_shutdown( struct usb_serial *serial ) 1734 { 1735 1736 int i; 1737 1738 1739 dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() ); 1740 1741 /* stop reads and writes on all ports */ 1742 for( i=0; i<serial->type->num_ports+1; i++ ) { 1743 usb_kill_urb(serial->port[i]->read_urb); 1744 usb_kill_urb(serial->port[i]->write_urb); 1745 } 1746 1747 /* free the private data structures for all ports */ 1748 /* number of regular ports + 1 for the out-of-band port */ 1749 for( i=0; i<serial->type->num_ports+1; i++ ) 1750 kfree( usb_get_serial_port_data(serial->port[i]) ); 1751 kfree( usb_get_serial_data(serial) ); 1752 } 1753 1754 1755 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs ) 1756 { 1757 1758 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1759 struct digi_port *priv; 1760 struct digi_serial *serial_priv; 1761 int ret; 1762 1763 1764 dbg( "digi_read_bulk_callback: TOP" ); 1765 1766 /* port sanity check, do not resubmit if port is not valid */ 1767 if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { 1768 err("%s: port or port->private is NULL, status=%d", __FUNCTION__, 1769 urb->status ); 1770 return; 1771 } 1772 if( port->serial == NULL 1773 || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) { 1774 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); 1775 return; 1776 } 1777 1778 /* do not resubmit urb if it has any status error */ 1779 if( urb->status ) { 1780 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num ); 1781 return; 1782 } 1783 1784 /* handle oob or inb callback, do not resubmit if error */ 1785 if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { 1786 if( digi_read_oob_callback( urb ) != 0 ) 1787 return; 1788 } else { 1789 if( digi_read_inb_callback( urb ) != 0 ) 1790 return; 1791 } 1792 1793 /* continue read */ 1794 urb->dev = port->serial->dev; 1795 if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) { 1796 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__, 1797 ret, priv->dp_port_num ); 1798 } 1799 1800 } 1801 1802 1803 /* 1804 * Digi Read INB Callback 1805 * 1806 * Digi Read INB Callback handles reads on the in band ports, sending 1807 * the data on to the tty subsystem. When called we know port and 1808 * port->private are not NULL and port->serial has been validated. 1809 * It returns 0 if successful, 1 if successful but the port is 1810 * throttled, and -1 if the sanity checks failed. 1811 */ 1812 1813 static int digi_read_inb_callback( struct urb *urb ) 1814 { 1815 1816 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1817 struct tty_struct *tty = port->tty; 1818 struct digi_port *priv = usb_get_serial_port_data(port); 1819 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1820 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1821 int status = ((unsigned char *)urb->transfer_buffer)[2]; 1822 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3; 1823 int flag,throttled; 1824 1825 /* do not process callbacks on closed ports */ 1826 /* but do continue the read chain */ 1827 if( port->open_count == 0 ) 1828 return( 0 ); 1829 1830 /* short/multiple packet check */ 1831 if( urb->actual_length != len + 2 ) { 1832 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 ); 1833 return( -1 ); 1834 } 1835 1836 spin_lock( &priv->dp_port_lock ); 1837 1838 /* check for throttle; if set, do not resubmit read urb */ 1839 /* indicate the read chain needs to be restarted on unthrottle */ 1840 throttled = priv->dp_throttled; 1841 if( throttled ) 1842 priv->dp_throttle_restart = 1; 1843 1844 /* receive data */ 1845 if( opcode == DIGI_CMD_RECEIVE_DATA ) { 1846 1847 /* get flag from status */ 1848 flag = 0; 1849 1850 /* overrun is special, not associated with a char */ 1851 if( status & DIGI_OVERRUN_ERROR ) { 1852 tty_insert_flip_char( tty, 0, TTY_OVERRUN ); 1853 } 1854 1855 /* break takes precedence over parity, */ 1856 /* which takes precedence over framing errors */ 1857 if( status & DIGI_BREAK_ERROR ) { 1858 flag = TTY_BREAK; 1859 } else if( status & DIGI_PARITY_ERROR ) { 1860 flag = TTY_PARITY; 1861 } else if( status & DIGI_FRAMING_ERROR ) { 1862 flag = TTY_FRAME; 1863 } 1864 1865 /* data length is len-1 (one byte of len is status) */ 1866 --len; 1867 1868 if( throttled ) { 1869 1870 len = min( len, 1871 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len ); 1872 1873 if( len > 0 ) { 1874 memcpy( priv->dp_in_buf + priv->dp_in_buf_len, 1875 data, len ); 1876 memset( priv->dp_in_flag_buf 1877 + priv->dp_in_buf_len, flag, len ); 1878 priv->dp_in_buf_len += len; 1879 } 1880 1881 } else { 1882 1883 len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count ); 1884 1885 if( len > 0 ) { 1886 memcpy( tty->flip.char_buf_ptr, data, len ); 1887 memset( tty->flip.flag_buf_ptr, flag, len ); 1888 tty->flip.char_buf_ptr += len; 1889 tty->flip.flag_buf_ptr += len; 1890 tty->flip.count += len; 1891 tty_flip_buffer_push( tty ); 1892 } 1893 1894 } 1895 1896 } 1897 1898 spin_unlock( &priv->dp_port_lock ); 1899 1900 if( opcode == DIGI_CMD_RECEIVE_DISABLE ) { 1901 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ ); 1902 } else if( opcode != DIGI_CMD_RECEIVE_DATA ) { 1903 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode ); 1904 } 1905 1906 return( throttled ? 1 : 0 ); 1907 1908 } 1909 1910 1911 /* 1912 * Digi Read OOB Callback 1913 * 1914 * Digi Read OOB Callback handles reads on the out of band port. 1915 * When called we know port and port->private are not NULL and 1916 * the port->serial is valid. It returns 0 if successful, and 1917 * -1 if the sanity checks failed. 1918 */ 1919 1920 static int digi_read_oob_callback( struct urb *urb ) 1921 { 1922 1923 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 1924 struct usb_serial *serial = port->serial; 1925 struct digi_port *priv = usb_get_serial_port_data(port); 1926 int opcode, line, status, val; 1927 int i; 1928 1929 1930 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num, 1931 urb->actual_length ); 1932 1933 /* handle each oob command */ 1934 for( i=0; i<urb->actual_length-3; ) { 1935 1936 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1937 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1938 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1939 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1940 1941 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", 1942 opcode, line, status, val ); 1943 1944 if( status != 0 || line >= serial->type->num_ports ) 1945 continue; 1946 1947 port = serial->port[line]; 1948 1949 if ((priv=usb_get_serial_port_data(port)) == NULL ) 1950 return -1; 1951 1952 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) { 1953 1954 spin_lock( &priv->dp_port_lock ); 1955 1956 /* convert from digi flags to termiox flags */ 1957 if( val & DIGI_READ_INPUT_SIGNALS_CTS ) { 1958 priv->dp_modem_signals |= TIOCM_CTS; 1959 /* port must be open to use tty struct */ 1960 if( port->open_count 1961 && port->tty->termios->c_cflag & CRTSCTS ) { 1962 port->tty->hw_stopped = 0; 1963 digi_wakeup_write( port ); 1964 } 1965 } else { 1966 priv->dp_modem_signals &= ~TIOCM_CTS; 1967 /* port must be open to use tty struct */ 1968 if( port->open_count 1969 && port->tty->termios->c_cflag & CRTSCTS ) { 1970 port->tty->hw_stopped = 1; 1971 } 1972 } 1973 if( val & DIGI_READ_INPUT_SIGNALS_DSR ) 1974 priv->dp_modem_signals |= TIOCM_DSR; 1975 else 1976 priv->dp_modem_signals &= ~TIOCM_DSR; 1977 if( val & DIGI_READ_INPUT_SIGNALS_RI ) 1978 priv->dp_modem_signals |= TIOCM_RI; 1979 else 1980 priv->dp_modem_signals &= ~TIOCM_RI; 1981 if( val & DIGI_READ_INPUT_SIGNALS_DCD ) 1982 priv->dp_modem_signals |= TIOCM_CD; 1983 else 1984 priv->dp_modem_signals &= ~TIOCM_CD; 1985 1986 wake_up_interruptible( &priv->dp_modem_change_wait ); 1987 spin_unlock( &priv->dp_port_lock ); 1988 1989 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) { 1990 1991 spin_lock( &priv->dp_port_lock ); 1992 priv->dp_transmit_idle = 1; 1993 wake_up_interruptible( &priv->dp_transmit_idle_wait ); 1994 spin_unlock( &priv->dp_port_lock ); 1995 1996 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) { 1997 1998 wake_up( &priv->dp_flush_wait ); 1999 2000 } 2001 2002 } 2003 2004 return( 0 ); 2005 2006 } 2007 2008 2009 static int __init digi_init (void) 2010 { 2011 int retval; 2012 retval = usb_serial_register(&digi_acceleport_2_device); 2013 if (retval) 2014 goto failed_acceleport_2_device; 2015 retval = usb_serial_register(&digi_acceleport_4_device); 2016 if (retval) 2017 goto failed_acceleport_4_device; 2018 retval = usb_register(&digi_driver); 2019 if (retval) 2020 goto failed_usb_register; 2021 info(DRIVER_VERSION ":" DRIVER_DESC); 2022 return 0; 2023 failed_usb_register: 2024 usb_serial_deregister(&digi_acceleport_4_device); 2025 failed_acceleport_4_device: 2026 usb_serial_deregister(&digi_acceleport_2_device); 2027 failed_acceleport_2_device: 2028 return retval; 2029 } 2030 2031 2032 static void __exit digi_exit (void) 2033 { 2034 usb_deregister (&digi_driver); 2035 usb_serial_deregister (&digi_acceleport_2_device); 2036 usb_serial_deregister (&digi_acceleport_4_device); 2037 } 2038 2039 2040 module_init(digi_init); 2041 module_exit(digi_exit); 2042 2043 2044 MODULE_AUTHOR( DRIVER_AUTHOR ); 2045 MODULE_DESCRIPTION( DRIVER_DESC ); 2046 MODULE_LICENSE("GPL"); 2047 2048 module_param(debug, bool, S_IRUGO | S_IWUSR); 2049 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2050