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