1 /* 2 * Digi AccelePort USB-4 and USB-2 Serial Converters 3 * 4 * Copyright 2000 by Digi International 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's 12 * usb-serial driver. 13 * 14 * Peter Berger (pberger@brimson.com) 15 * Al Borchers (borchers@steinerpoint.com) 16 * 17 * (12/03/2001) gkh 18 * switched to using port->port.count instead of private version. 19 * Removed port->active 20 * 21 * (04/08/2001) gb 22 * Identify version on module load. 23 * 24 * (11/01/2000) Adam J. Richter 25 * usb_device_id table support 26 * 27 * (11/01/2000) pberger and borchers 28 * -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused 29 * USB 4 ports to hang on startup. 30 * -- Serialized access to write urbs by adding the dp_write_urb_in_use 31 * flag; otherwise, the driver caused SMP system hangs. Watching the 32 * urb status is not sufficient. 33 * 34 * (10/05/2000) gkh 35 * -- Fixed bug with urb->dev not being set properly, now that the usb 36 * core needs it. 37 * 38 * (8/8/2000) pberger and borchers 39 * -- Fixed close so that 40 * - it can timeout while waiting for transmit idle, if needed; 41 * - it ignores interrupts when flushing the port, turning 42 * of modem signalling, and so on; 43 * - it waits for the flush to really complete before returning. 44 * -- Read_bulk_callback and write_bulk_callback check for a closed 45 * port before using the tty struct or writing to the port. 46 * -- The two changes above fix the oops caused by interrupted closes. 47 * -- Added interruptible args to write_oob_command and set_modem_signals 48 * and added a timeout arg to transmit_idle; needed for fixes to 49 * close. 50 * -- Added code for rx_throttle and rx_unthrottle so that input flow 51 * control works. 52 * -- Added code to set overrun, parity, framing, and break errors 53 * (untested). 54 * -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length 55 * bulk writes are done. These hung the Digi USB device. The 56 * 0 length bulk writes were a new feature of usb-uhci added in 57 * the 2.4.0-test6 kernels. 58 * -- Fixed mod inc race in open; do mod inc before sleeping to wait 59 * for a close to finish. 60 * 61 * (7/31/2000) pberger 62 * -- Fixed bugs with hardware handshaking: 63 * - Added code to set/clear tty->hw_stopped in digi_read_oob_callback() 64 * and digi_set_termios() 65 * -- Added code in digi_set_termios() to 66 * - add conditional in code handling transition from B0 to only 67 * set RTS if RTS/CTS flow control is either not in use or if 68 * the port is not currently throttled. 69 * - handle turning off CRTSCTS. 70 * 71 * (7/30/2000) borchers 72 * -- Added support for more than one Digi USB device by moving 73 * globals to a private structure in the pointed to from the 74 * usb_serial structure. 75 * -- Moved the modem change and transmit idle wait queues into 76 * the port private structure, so each port has its own queue 77 * rather than sharing global queues. 78 * -- Added support for break signals. 79 * 80 * (7/25/2000) pberger 81 * -- Added USB-2 support. Note: the USB-2 supports 3 devices: two 82 * serial and a parallel port. The parallel port is implemented 83 * as a serial-to-parallel converter. That is, the driver actually 84 * presents all three USB-2 interfaces as serial ports, but the third 85 * one physically connects to a parallel device. Thus, for example, 86 * one could plug a parallel printer into the USB-2's third port, 87 * but from the kernel's (and userland's) point of view what's 88 * actually out there is a serial device. 89 * 90 * (7/15/2000) borchers 91 * -- Fixed race in open when a close is in progress. 92 * -- Keep count of opens and dec the module use count for each 93 * outstanding open when shutdown is called (on disconnect). 94 * -- Fixed sanity checks in read_bulk_callback and write_bulk_callback 95 * so pointers are checked before use. 96 * -- Split read bulk callback into in band and out of band 97 * callbacks, and no longer restart read chains if there is 98 * a status error or a sanity error. This fixed the seg 99 * faults and other errors we used to get on disconnect. 100 * -- Port->active is once again a flag as usb-serial intended it 101 * to be, not a count. Since it was only a char it would 102 * have been limited to 256 simultaneous opens. Now the open 103 * count is kept in the port private structure in dp_open_count. 104 * -- Added code for modularization of the digi_acceleport driver. 105 * 106 * (6/27/2000) pberger and borchers 107 * -- Zeroed out sync field in the wakeup_task before first use; 108 * otherwise the uninitialized value might prevent the task from 109 * being scheduled. 110 * -- Initialized ret value to 0 in write_bulk_callback, otherwise 111 * the uninitialized value could cause a spurious debugging message. 112 * 113 * (6/22/2000) pberger and borchers 114 * -- Made cond_wait_... inline--apparently on SPARC the flags arg 115 * to spin_lock_irqsave cannot be passed to another function 116 * to call spin_unlock_irqrestore. Thanks to Pauline Middelink. 117 * -- In digi_set_modem_signals the inner nested spin locks use just 118 * spin_lock() rather than spin_lock_irqsave(). The old code 119 * mistakenly left interrupts off. Thanks to Pauline Middelink. 120 * -- copy_from_user (which can sleep) is no longer called while a 121 * spinlock is held. We copy to a local buffer before getting 122 * the spinlock--don't like the extra copy but the code is simpler. 123 * -- Printk and dbg are no longer called while a spin lock is held. 124 * 125 * (6/4/2000) pberger and borchers 126 * -- Replaced separate calls to spin_unlock_irqrestore and 127 * interruptible_sleep_on_timeout with a new function 128 * cond_wait_interruptible_timeout_irqrestore. This eliminates 129 * the race condition where the wake up could happen after 130 * the unlock and before the sleep. 131 * -- Close now waits for output to drain. 132 * -- Open waits until any close in progress is finished. 133 * -- All out of band responses are now processed, not just the 134 * first in a USB packet. 135 * -- Fixed a bug that prevented the driver from working when the 136 * first Digi port was not the first USB serial port--the driver 137 * was mistakenly using the external USB serial port number to 138 * try to index into its internal ports. 139 * -- Fixed an SMP bug -- write_bulk_callback is called directly from 140 * an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are 141 * needed for locks outside write_bulk_callback that are also 142 * acquired by write_bulk_callback to prevent deadlocks. 143 * -- Fixed support for select() by making digi_chars_in_buffer() 144 * return 256 when -EINPROGRESS is set, as the line discipline 145 * code in n_tty.c expects. 146 * -- Fixed an include file ordering problem that prevented debugging 147 * messages from working. 148 * -- Fixed an intermittent timeout problem that caused writes to 149 * sometimes get stuck on some machines on some kernels. It turns 150 * out in these circumstances write_chan() (in n_tty.c) was 151 * asleep waiting for our wakeup call. Even though we call 152 * wake_up_interruptible() in digi_write_bulk_callback(), there is 153 * a race condition that could cause the wakeup to fail: if our 154 * wake_up_interruptible() call occurs between the time that our 155 * driver write routine finishes and write_chan() sets current->state 156 * to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state 157 * to TASK_RUNNING will be lost and write_chan's subsequent call to 158 * schedule() will never return (unless it catches a signal). 159 * This race condition occurs because write_bulk_callback() (and thus 160 * the wakeup) are called asynchronously from an interrupt, rather than 161 * from the scheduler. We can avoid the race by calling the wakeup 162 * from the scheduler queue and that's our fix: Now, at the end of 163 * write_bulk_callback() we queue up a wakeup call on the scheduler 164 * task queue. We still also invoke the wakeup directly since that 165 * squeezes a bit more performance out of the driver, and any lost 166 * race conditions will get cleaned up at the next scheduler run. 167 * 168 * NOTE: The problem also goes away if you comment out 169 * the two code lines in write_chan() where current->state 170 * is set to TASK_RUNNING just before calling driver.write() and to 171 * TASK_INTERRUPTIBLE immediately afterwards. This is why the 172 * problem did not show up with the 2.2 kernels -- they do not 173 * include that code. 174 * 175 * (5/16/2000) pberger and borchers 176 * -- Added timeouts to sleeps, to defend against lost wake ups. 177 * -- Handle transition to/from B0 baud rate in digi_set_termios. 178 * 179 * (5/13/2000) pberger and borchers 180 * -- All commands now sent on out of band port, using 181 * digi_write_oob_command. 182 * -- Get modem control signals whenever they change, support TIOCMGET/ 183 * SET/BIS/BIC ioctls. 184 * -- digi_set_termios now supports parity, word size, stop bits, and 185 * receive enable. 186 * -- Cleaned up open and close, use digi_set_termios and 187 * digi_write_oob_command to set port parameters. 188 * -- Added digi_startup_device to start read chains on all ports. 189 * -- Write buffer is only used when count==1, to be sure put_char can 190 * write a char (unless the buffer is full). 191 * 192 * (5/10/2000) pberger and borchers 193 * -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close. 194 * -- Fixed problem where the first incoming character is lost on 195 * port opens after the first close on that port. Now we keep 196 * the read_urb chain open until shutdown. 197 * -- Added more port conditioning calls in digi_open and digi_close. 198 * -- Convert port->active to a use count so that we can deal with multiple 199 * opens and closes properly. 200 * -- Fixed some problems with the locking code. 201 * 202 * (5/3/2000) pberger and borchers 203 * -- First alpha version of the driver--many known limitations and bugs. 204 * 205 * 206 * Locking and SMP 207 * 208 * - Each port, including the out-of-band port, has a lock used to 209 * serialize all access to the port's private structure. 210 * - The port lock is also used to serialize all writes and access to 211 * the port's URB. 212 * - The port lock is also used for the port write_wait condition 213 * variable. Holding the port lock will prevent a wake up on the 214 * port's write_wait; this can be used with cond_wait_... to be sure 215 * the wake up is not lost in a race when dropping the lock and 216 * sleeping waiting for the wakeup. 217 * - digi_write() does not sleep, since it is sometimes called on 218 * interrupt time. 219 * - digi_write_bulk_callback() and digi_read_bulk_callback() are 220 * called directly from interrupts. Hence spin_lock_irqsave() 221 * and spin_unlock_irqrestore() are used in the rest of the code 222 * for any locks they acquire. 223 * - digi_write_bulk_callback() gets the port lock before waking up 224 * processes sleeping on the port write_wait. It also schedules 225 * wake ups so they happen from the scheduler, because the tty 226 * system can miss wake ups from interrupts. 227 * - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to 228 * recheck the condition they are sleeping on. This is defensive, 229 * in case a wake up is lost. 230 * - Following Documentation/DocBook/kernel-locking.pdf no spin locks 231 * are held when calling copy_to/from_user or printk. 232 */ 233 234 #include <linux/kernel.h> 235 #include <linux/errno.h> 236 #include <linux/init.h> 237 #include <linux/slab.h> 238 #include <linux/tty.h> 239 #include <linux/tty_driver.h> 240 #include <linux/tty_flip.h> 241 #include <linux/module.h> 242 #include <linux/spinlock.h> 243 #include <linux/workqueue.h> 244 #include <linux/uaccess.h> 245 #include <linux/usb.h> 246 #include <linux/wait.h> 247 #include <linux/usb/serial.h> 248 249 /* Defines */ 250 251 /* 252 * Version Information 253 */ 254 #define DRIVER_VERSION "v1.80.1.2" 255 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 256 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 257 258 /* port output buffer length -- must be <= transfer buffer length - 2 */ 259 /* so we can be sure to send the full buffer in one urb */ 260 #define DIGI_OUT_BUF_SIZE 8 261 262 /* port input buffer length -- must be >= transfer buffer length - 3 */ 263 /* so we can be sure to hold at least one full buffer from one urb */ 264 #define DIGI_IN_BUF_SIZE 64 265 266 /* retry timeout while sleeping */ 267 #define DIGI_RETRY_TIMEOUT (HZ/10) 268 269 /* timeout while waiting for tty output to drain in close */ 270 /* this delay is used twice in close, so the total delay could */ 271 /* be twice this value */ 272 #define DIGI_CLOSE_TIMEOUT (5*HZ) 273 274 275 /* AccelePort USB Defines */ 276 277 /* ids */ 278 #define DIGI_VENDOR_ID 0x05c5 279 #define DIGI_2_ID 0x0002 /* USB-2 */ 280 #define DIGI_4_ID 0x0004 /* USB-4 */ 281 282 /* commands 283 * "INB": can be used on the in-band endpoint 284 * "OOB": can be used on the out-of-band endpoint 285 */ 286 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 287 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 288 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 289 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 290 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 291 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 292 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 293 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 294 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 295 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 296 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 297 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 298 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 299 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 300 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 301 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 302 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 303 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 304 #define DIGI_CMD_SEND_DATA 18 /* INB */ 305 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 306 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 307 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 308 309 /* baud rates */ 310 #define DIGI_BAUD_50 0 311 #define DIGI_BAUD_75 1 312 #define DIGI_BAUD_110 2 313 #define DIGI_BAUD_150 3 314 #define DIGI_BAUD_200 4 315 #define DIGI_BAUD_300 5 316 #define DIGI_BAUD_600 6 317 #define DIGI_BAUD_1200 7 318 #define DIGI_BAUD_1800 8 319 #define DIGI_BAUD_2400 9 320 #define DIGI_BAUD_4800 10 321 #define DIGI_BAUD_7200 11 322 #define DIGI_BAUD_9600 12 323 #define DIGI_BAUD_14400 13 324 #define DIGI_BAUD_19200 14 325 #define DIGI_BAUD_28800 15 326 #define DIGI_BAUD_38400 16 327 #define DIGI_BAUD_57600 17 328 #define DIGI_BAUD_76800 18 329 #define DIGI_BAUD_115200 19 330 #define DIGI_BAUD_153600 20 331 #define DIGI_BAUD_230400 21 332 #define DIGI_BAUD_460800 22 333 334 /* arguments */ 335 #define DIGI_WORD_SIZE_5 0 336 #define DIGI_WORD_SIZE_6 1 337 #define DIGI_WORD_SIZE_7 2 338 #define DIGI_WORD_SIZE_8 3 339 340 #define DIGI_PARITY_NONE 0 341 #define DIGI_PARITY_ODD 1 342 #define DIGI_PARITY_EVEN 2 343 #define DIGI_PARITY_MARK 3 344 #define DIGI_PARITY_SPACE 4 345 346 #define DIGI_STOP_BITS_1 0 347 #define DIGI_STOP_BITS_2 1 348 349 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 350 #define DIGI_INPUT_FLOW_CONTROL_RTS 2 351 #define DIGI_INPUT_FLOW_CONTROL_DTR 4 352 353 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 354 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 355 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 356 357 #define DIGI_DTR_INACTIVE 0 358 #define DIGI_DTR_ACTIVE 1 359 #define DIGI_DTR_INPUT_FLOW_CONTROL 2 360 361 #define DIGI_RTS_INACTIVE 0 362 #define DIGI_RTS_ACTIVE 1 363 #define DIGI_RTS_INPUT_FLOW_CONTROL 2 364 #define DIGI_RTS_TOGGLE 3 365 366 #define DIGI_FLUSH_TX 1 367 #define DIGI_FLUSH_RX 2 368 #define DIGI_RESUME_TX 4 /* clears xoff condition */ 369 370 #define DIGI_TRANSMIT_NOT_IDLE 0 371 #define DIGI_TRANSMIT_IDLE 1 372 373 #define DIGI_DISABLE 0 374 #define DIGI_ENABLE 1 375 376 #define DIGI_DEASSERT 0 377 #define DIGI_ASSERT 1 378 379 /* in band status codes */ 380 #define DIGI_OVERRUN_ERROR 4 381 #define DIGI_PARITY_ERROR 8 382 #define DIGI_FRAMING_ERROR 16 383 #define DIGI_BREAK_ERROR 32 384 385 /* out of band status */ 386 #define DIGI_NO_ERROR 0 387 #define DIGI_BAD_FIRST_PARAMETER 1 388 #define DIGI_BAD_SECOND_PARAMETER 2 389 #define DIGI_INVALID_LINE 3 390 #define DIGI_INVALID_OPCODE 4 391 392 /* input signals */ 393 #define DIGI_READ_INPUT_SIGNALS_SLOT 1 394 #define DIGI_READ_INPUT_SIGNALS_ERR 2 395 #define DIGI_READ_INPUT_SIGNALS_BUSY 4 396 #define DIGI_READ_INPUT_SIGNALS_PE 8 397 #define DIGI_READ_INPUT_SIGNALS_CTS 16 398 #define DIGI_READ_INPUT_SIGNALS_DSR 32 399 #define DIGI_READ_INPUT_SIGNALS_RI 64 400 #define DIGI_READ_INPUT_SIGNALS_DCD 128 401 402 403 /* Structures */ 404 405 struct digi_serial { 406 spinlock_t ds_serial_lock; 407 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 408 int ds_oob_port_num; /* index of out-of-band port */ 409 int ds_device_started; 410 }; 411 412 struct digi_port { 413 spinlock_t dp_port_lock; 414 int dp_port_num; 415 int dp_out_buf_len; 416 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 417 int dp_write_urb_in_use; 418 unsigned int dp_modem_signals; 419 wait_queue_head_t dp_modem_change_wait; 420 int dp_transmit_idle; 421 wait_queue_head_t dp_transmit_idle_wait; 422 int dp_throttled; 423 int dp_throttle_restart; 424 wait_queue_head_t dp_flush_wait; 425 int dp_in_close; /* close in progress */ 426 wait_queue_head_t dp_close_wait; /* wait queue for close */ 427 struct work_struct dp_wakeup_work; 428 struct usb_serial_port *dp_port; 429 }; 430 431 432 /* Local Function Declarations */ 433 434 static void digi_wakeup_write(struct usb_serial_port *port); 435 static void digi_wakeup_write_lock(struct work_struct *work); 436 static int digi_write_oob_command(struct usb_serial_port *port, 437 unsigned char *buf, int count, int interruptible); 438 static int digi_write_inb_command(struct usb_serial_port *port, 439 unsigned char *buf, int count, unsigned long timeout); 440 static int digi_set_modem_signals(struct usb_serial_port *port, 441 unsigned int modem_signals, int interruptible); 442 static int digi_transmit_idle(struct usb_serial_port *port, 443 unsigned long timeout); 444 static void digi_rx_throttle(struct tty_struct *tty); 445 static void digi_rx_unthrottle(struct tty_struct *tty); 446 static void digi_set_termios(struct tty_struct *tty, 447 struct usb_serial_port *port, struct ktermios *old_termios); 448 static void digi_break_ctl(struct tty_struct *tty, int break_state); 449 static int digi_tiocmget(struct tty_struct *tty, struct file *file); 450 static int digi_tiocmset(struct tty_struct *tty, struct file *file, 451 unsigned int set, unsigned int clear); 452 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 453 const unsigned char *buf, int count); 454 static void digi_write_bulk_callback(struct urb *urb); 455 static int digi_write_room(struct tty_struct *tty); 456 static int digi_chars_in_buffer(struct tty_struct *tty); 457 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port, 458 struct file *filp); 459 static void digi_close(struct tty_struct *tty, struct usb_serial_port *port, 460 struct file *filp); 461 static int digi_startup_device(struct usb_serial *serial); 462 static int digi_startup(struct usb_serial *serial); 463 static void digi_shutdown(struct usb_serial *serial); 464 static void digi_read_bulk_callback(struct urb *urb); 465 static int digi_read_inb_callback(struct urb *urb); 466 static int digi_read_oob_callback(struct urb *urb); 467 468 469 /* Statics */ 470 471 static int debug; 472 473 static struct usb_device_id id_table_combined [] = { 474 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 475 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 476 { } /* Terminating entry */ 477 }; 478 479 static struct usb_device_id id_table_2 [] = { 480 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 481 { } /* Terminating entry */ 482 }; 483 484 static struct usb_device_id id_table_4 [] = { 485 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 486 { } /* Terminating entry */ 487 }; 488 489 MODULE_DEVICE_TABLE(usb, id_table_combined); 490 491 static struct usb_driver digi_driver = { 492 .name = "digi_acceleport", 493 .probe = usb_serial_probe, 494 .disconnect = usb_serial_disconnect, 495 .id_table = id_table_combined, 496 .no_dynamic_id = 1, 497 }; 498 499 500 /* device info needed for the Digi serial converter */ 501 502 static struct usb_serial_driver digi_acceleport_2_device = { 503 .driver = { 504 .owner = THIS_MODULE, 505 .name = "digi_2", 506 }, 507 .description = "Digi 2 port USB adapter", 508 .usb_driver = &digi_driver, 509 .id_table = id_table_2, 510 .num_ports = 3, 511 .open = digi_open, 512 .close = digi_close, 513 .write = digi_write, 514 .write_room = digi_write_room, 515 .write_bulk_callback = digi_write_bulk_callback, 516 .read_bulk_callback = digi_read_bulk_callback, 517 .chars_in_buffer = digi_chars_in_buffer, 518 .throttle = digi_rx_throttle, 519 .unthrottle = digi_rx_unthrottle, 520 .set_termios = digi_set_termios, 521 .break_ctl = digi_break_ctl, 522 .tiocmget = digi_tiocmget, 523 .tiocmset = digi_tiocmset, 524 .attach = digi_startup, 525 .shutdown = digi_shutdown, 526 }; 527 528 static struct usb_serial_driver digi_acceleport_4_device = { 529 .driver = { 530 .owner = THIS_MODULE, 531 .name = "digi_4", 532 }, 533 .description = "Digi 4 port USB adapter", 534 .usb_driver = &digi_driver, 535 .id_table = id_table_4, 536 .num_ports = 4, 537 .open = digi_open, 538 .close = digi_close, 539 .write = digi_write, 540 .write_room = digi_write_room, 541 .write_bulk_callback = digi_write_bulk_callback, 542 .read_bulk_callback = digi_read_bulk_callback, 543 .chars_in_buffer = digi_chars_in_buffer, 544 .throttle = digi_rx_throttle, 545 .unthrottle = digi_rx_unthrottle, 546 .set_termios = digi_set_termios, 547 .break_ctl = digi_break_ctl, 548 .tiocmget = digi_tiocmget, 549 .tiocmset = digi_tiocmset, 550 .attach = digi_startup, 551 .shutdown = digi_shutdown, 552 }; 553 554 555 /* Functions */ 556 557 /* 558 * Cond Wait Interruptible Timeout Irqrestore 559 * 560 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 561 * so that wake ups are not lost if they occur between the unlock 562 * and the sleep. In other words, spin_unlock_irqrestore and 563 * interruptible_sleep_on_timeout are "atomic" with respect to 564 * wake ups. This is used to implement condition variables. 565 * 566 * interruptible_sleep_on_timeout is deprecated and has been replaced 567 * with the equivalent code. 568 */ 569 570 static long cond_wait_interruptible_timeout_irqrestore( 571 wait_queue_head_t *q, long timeout, 572 spinlock_t *lock, unsigned long flags) 573 __releases(lock) 574 { 575 DEFINE_WAIT(wait); 576 577 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 578 spin_unlock_irqrestore(lock, flags); 579 timeout = schedule_timeout(timeout); 580 finish_wait(q, &wait); 581 582 return timeout; 583 } 584 585 586 /* 587 * Digi Wakeup Write 588 * 589 * Wake up port, line discipline, and tty processes sleeping 590 * on writes. 591 */ 592 593 static void digi_wakeup_write_lock(struct work_struct *work) 594 { 595 struct digi_port *priv = 596 container_of(work, struct digi_port, dp_wakeup_work); 597 struct usb_serial_port *port = priv->dp_port; 598 unsigned long flags; 599 600 spin_lock_irqsave(&priv->dp_port_lock, flags); 601 digi_wakeup_write(port); 602 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 603 } 604 605 static void digi_wakeup_write(struct usb_serial_port *port) 606 { 607 struct tty_struct *tty = tty_port_tty_get(&port->port); 608 tty_wakeup(tty); 609 tty_kref_put(tty); 610 } 611 612 613 /* 614 * Digi Write OOB Command 615 * 616 * Write commands on the out of band port. Commands are 4 617 * bytes each, multiple commands can be sent at once, and 618 * no command will be split across USB packets. Returns 0 619 * if successful, -EINTR if interrupted while sleeping and 620 * the interruptible flag is true, or a negative error 621 * returned by usb_submit_urb. 622 */ 623 624 static int digi_write_oob_command(struct usb_serial_port *port, 625 unsigned char *buf, int count, int interruptible) 626 { 627 628 int ret = 0; 629 int len; 630 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 631 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 632 unsigned long flags = 0; 633 634 dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count); 635 636 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 637 while (count > 0) { 638 while (oob_port->write_urb->status == -EINPROGRESS 639 || oob_priv->dp_write_urb_in_use) { 640 cond_wait_interruptible_timeout_irqrestore( 641 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 642 &oob_priv->dp_port_lock, flags); 643 if (interruptible && signal_pending(current)) 644 return -EINTR; 645 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 646 } 647 648 /* len must be a multiple of 4, so commands are not split */ 649 len = min(count, oob_port->bulk_out_size); 650 if (len > 4) 651 len &= ~3; 652 memcpy(oob_port->write_urb->transfer_buffer, buf, len); 653 oob_port->write_urb->transfer_buffer_length = len; 654 oob_port->write_urb->dev = port->serial->dev; 655 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 656 if (ret == 0) { 657 oob_priv->dp_write_urb_in_use = 1; 658 count -= len; 659 buf += len; 660 } 661 } 662 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 663 if (ret) 664 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 665 __func__, ret); 666 return ret; 667 668 } 669 670 671 /* 672 * Digi Write In Band Command 673 * 674 * Write commands on the given port. Commands are 4 675 * bytes each, multiple commands can be sent at once, and 676 * no command will be split across USB packets. If timeout 677 * is non-zero, write in band command will return after 678 * waiting unsuccessfully for the URB status to clear for 679 * timeout ticks. Returns 0 if successful, or a negative 680 * error returned by digi_write. 681 */ 682 683 static int digi_write_inb_command(struct usb_serial_port *port, 684 unsigned char *buf, int count, unsigned long timeout) 685 { 686 int ret = 0; 687 int len; 688 struct digi_port *priv = usb_get_serial_port_data(port); 689 unsigned char *data = port->write_urb->transfer_buffer; 690 unsigned long flags = 0; 691 692 dbg("digi_write_inb_command: TOP: port=%d, count=%d", 693 priv->dp_port_num, count); 694 695 if (timeout) 696 timeout += jiffies; 697 else 698 timeout = ULONG_MAX; 699 700 spin_lock_irqsave(&priv->dp_port_lock, flags); 701 while (count > 0 && ret == 0) { 702 while ((port->write_urb->status == -EINPROGRESS 703 || priv->dp_write_urb_in_use) 704 && time_before(jiffies, timeout)) { 705 cond_wait_interruptible_timeout_irqrestore( 706 &port->write_wait, DIGI_RETRY_TIMEOUT, 707 &priv->dp_port_lock, flags); 708 if (signal_pending(current)) 709 return -EINTR; 710 spin_lock_irqsave(&priv->dp_port_lock, flags); 711 } 712 713 /* len must be a multiple of 4 and small enough to */ 714 /* guarantee the write will send buffered data first, */ 715 /* so commands are in order with data and not split */ 716 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 717 if (len > 4) 718 len &= ~3; 719 720 /* write any buffered data first */ 721 if (priv->dp_out_buf_len > 0) { 722 data[0] = DIGI_CMD_SEND_DATA; 723 data[1] = priv->dp_out_buf_len; 724 memcpy(data + 2, priv->dp_out_buf, 725 priv->dp_out_buf_len); 726 memcpy(data + 2 + priv->dp_out_buf_len, buf, len); 727 port->write_urb->transfer_buffer_length 728 = priv->dp_out_buf_len + 2 + len; 729 } else { 730 memcpy(data, buf, len); 731 port->write_urb->transfer_buffer_length = len; 732 } 733 port->write_urb->dev = port->serial->dev; 734 735 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 736 if (ret == 0) { 737 priv->dp_write_urb_in_use = 1; 738 priv->dp_out_buf_len = 0; 739 count -= len; 740 buf += len; 741 } 742 743 } 744 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 745 746 if (ret) 747 dev_err(&port->dev, 748 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 749 __func__, ret, priv->dp_port_num); 750 return ret; 751 } 752 753 754 /* 755 * Digi Set Modem Signals 756 * 757 * Sets or clears DTR and RTS on the port, according to the 758 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 759 * for the modem_signals argument. Returns 0 if successful, 760 * -EINTR if interrupted while sleeping, or a non-zero error 761 * returned by usb_submit_urb. 762 */ 763 764 static int digi_set_modem_signals(struct usb_serial_port *port, 765 unsigned int modem_signals, int interruptible) 766 { 767 768 int ret; 769 struct digi_port *port_priv = usb_get_serial_port_data(port); 770 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 771 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 772 unsigned char *data = oob_port->write_urb->transfer_buffer; 773 unsigned long flags = 0; 774 775 776 dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", 777 port_priv->dp_port_num, modem_signals); 778 779 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 780 spin_lock(&port_priv->dp_port_lock); 781 782 while (oob_port->write_urb->status == -EINPROGRESS || 783 oob_priv->dp_write_urb_in_use) { 784 spin_unlock(&port_priv->dp_port_lock); 785 cond_wait_interruptible_timeout_irqrestore( 786 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 787 &oob_priv->dp_port_lock, flags); 788 if (interruptible && signal_pending(current)) 789 return -EINTR; 790 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 791 spin_lock(&port_priv->dp_port_lock); 792 } 793 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 794 data[1] = port_priv->dp_port_num; 795 data[2] = (modem_signals & TIOCM_DTR) ? 796 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 797 data[3] = 0; 798 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 799 data[5] = port_priv->dp_port_num; 800 data[6] = (modem_signals & TIOCM_RTS) ? 801 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 802 data[7] = 0; 803 804 oob_port->write_urb->transfer_buffer_length = 8; 805 oob_port->write_urb->dev = port->serial->dev; 806 807 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 808 if (ret == 0) { 809 oob_priv->dp_write_urb_in_use = 1; 810 port_priv->dp_modem_signals = 811 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 812 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 813 } 814 spin_unlock(&port_priv->dp_port_lock); 815 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 816 if (ret) 817 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 818 __func__, ret); 819 return ret; 820 } 821 822 /* 823 * Digi Transmit Idle 824 * 825 * Digi transmit idle waits, up to timeout ticks, for the transmitter 826 * to go idle. It returns 0 if successful or a negative error. 827 * 828 * There are race conditions here if more than one process is calling 829 * digi_transmit_idle on the same port at the same time. However, this 830 * is only called from close, and only one process can be in close on a 831 * port at a time, so its ok. 832 */ 833 834 static int digi_transmit_idle(struct usb_serial_port *port, 835 unsigned long timeout) 836 { 837 int ret; 838 unsigned char buf[2]; 839 struct digi_port *priv = usb_get_serial_port_data(port); 840 unsigned long flags = 0; 841 842 spin_lock_irqsave(&priv->dp_port_lock, flags); 843 priv->dp_transmit_idle = 0; 844 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 845 846 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 847 buf[1] = 0; 848 849 timeout += jiffies; 850 851 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies); 852 if (ret != 0) 853 return ret; 854 855 spin_lock_irqsave(&priv->dp_port_lock, flags); 856 857 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) { 858 cond_wait_interruptible_timeout_irqrestore( 859 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 860 &priv->dp_port_lock, flags); 861 if (signal_pending(current)) 862 return -EINTR; 863 spin_lock_irqsave(&priv->dp_port_lock, flags); 864 } 865 priv->dp_transmit_idle = 0; 866 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 867 return 0; 868 869 } 870 871 872 static void digi_rx_throttle(struct tty_struct *tty) 873 { 874 unsigned long flags; 875 struct usb_serial_port *port = tty->driver_data; 876 struct digi_port *priv = usb_get_serial_port_data(port); 877 878 879 dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num); 880 881 /* stop receiving characters by not resubmitting the read urb */ 882 spin_lock_irqsave(&priv->dp_port_lock, flags); 883 priv->dp_throttled = 1; 884 priv->dp_throttle_restart = 0; 885 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 886 } 887 888 889 static void digi_rx_unthrottle(struct tty_struct *tty) 890 { 891 int ret = 0; 892 unsigned long flags; 893 struct usb_serial_port *port = tty->driver_data; 894 struct digi_port *priv = usb_get_serial_port_data(port); 895 896 dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num); 897 898 spin_lock_irqsave(&priv->dp_port_lock, flags); 899 900 /* turn throttle off */ 901 priv->dp_throttled = 0; 902 priv->dp_throttle_restart = 0; 903 904 /* restart read chain */ 905 if (priv->dp_throttle_restart) { 906 port->read_urb->dev = port->serial->dev; 907 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC); 908 } 909 910 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 911 912 if (ret) 913 dev_err(&port->dev, 914 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 915 __func__, ret, priv->dp_port_num); 916 } 917 918 919 static void digi_set_termios(struct tty_struct *tty, 920 struct usb_serial_port *port, struct ktermios *old_termios) 921 { 922 struct digi_port *priv = usb_get_serial_port_data(port); 923 unsigned int iflag = tty->termios->c_iflag; 924 unsigned int cflag = tty->termios->c_cflag; 925 unsigned int old_iflag = old_termios->c_iflag; 926 unsigned int old_cflag = old_termios->c_cflag; 927 unsigned char buf[32]; 928 unsigned int modem_signals; 929 int arg, ret; 930 int i = 0; 931 speed_t baud; 932 933 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); 934 935 /* set baud rate */ 936 baud = tty_get_baud_rate(tty); 937 if (baud != tty_termios_baud_rate(old_termios)) { 938 arg = -1; 939 940 /* reassert DTR and (maybe) RTS on transition from B0 */ 941 if ((old_cflag&CBAUD) == B0) { 942 /* don't set RTS if using hardware flow control */ 943 /* and throttling input */ 944 modem_signals = TIOCM_DTR; 945 if (!(tty->termios->c_cflag & CRTSCTS) || 946 !test_bit(TTY_THROTTLED, &tty->flags)) 947 modem_signals |= TIOCM_RTS; 948 digi_set_modem_signals(port, modem_signals, 1); 949 } 950 switch (baud) { 951 /* drop DTR and RTS on transition to B0 */ 952 case 0: digi_set_modem_signals(port, 0, 1); break; 953 case 50: arg = DIGI_BAUD_50; break; 954 case 75: arg = DIGI_BAUD_75; break; 955 case 110: arg = DIGI_BAUD_110; break; 956 case 150: arg = DIGI_BAUD_150; break; 957 case 200: arg = DIGI_BAUD_200; break; 958 case 300: arg = DIGI_BAUD_300; break; 959 case 600: arg = DIGI_BAUD_600; break; 960 case 1200: arg = DIGI_BAUD_1200; break; 961 case 1800: arg = DIGI_BAUD_1800; break; 962 case 2400: arg = DIGI_BAUD_2400; break; 963 case 4800: arg = DIGI_BAUD_4800; break; 964 case 9600: arg = DIGI_BAUD_9600; break; 965 case 19200: arg = DIGI_BAUD_19200; break; 966 case 38400: arg = DIGI_BAUD_38400; break; 967 case 57600: arg = DIGI_BAUD_57600; break; 968 case 115200: arg = DIGI_BAUD_115200; break; 969 case 230400: arg = DIGI_BAUD_230400; break; 970 case 460800: arg = DIGI_BAUD_460800; break; 971 default: 972 arg = DIGI_BAUD_9600; 973 baud = 9600; 974 break; 975 } 976 if (arg != -1) { 977 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 978 buf[i++] = priv->dp_port_num; 979 buf[i++] = arg; 980 buf[i++] = 0; 981 } 982 } 983 /* set parity */ 984 tty->termios->c_cflag &= ~CMSPAR; 985 986 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) { 987 if (cflag&PARENB) { 988 if (cflag&PARODD) 989 arg = DIGI_PARITY_ODD; 990 else 991 arg = DIGI_PARITY_EVEN; 992 } else { 993 arg = DIGI_PARITY_NONE; 994 } 995 buf[i++] = DIGI_CMD_SET_PARITY; 996 buf[i++] = priv->dp_port_num; 997 buf[i++] = arg; 998 buf[i++] = 0; 999 } 1000 /* set word size */ 1001 if ((cflag&CSIZE) != (old_cflag&CSIZE)) { 1002 arg = -1; 1003 switch (cflag&CSIZE) { 1004 case CS5: arg = DIGI_WORD_SIZE_5; break; 1005 case CS6: arg = DIGI_WORD_SIZE_6; break; 1006 case CS7: arg = DIGI_WORD_SIZE_7; break; 1007 case CS8: arg = DIGI_WORD_SIZE_8; break; 1008 default: 1009 dbg("digi_set_termios: can't handle word size %d", 1010 (cflag&CSIZE)); 1011 break; 1012 } 1013 1014 if (arg != -1) { 1015 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 1016 buf[i++] = priv->dp_port_num; 1017 buf[i++] = arg; 1018 buf[i++] = 0; 1019 } 1020 1021 } 1022 1023 /* set stop bits */ 1024 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) { 1025 1026 if ((cflag&CSTOPB)) 1027 arg = DIGI_STOP_BITS_2; 1028 else 1029 arg = DIGI_STOP_BITS_1; 1030 1031 buf[i++] = DIGI_CMD_SET_STOP_BITS; 1032 buf[i++] = priv->dp_port_num; 1033 buf[i++] = arg; 1034 buf[i++] = 0; 1035 1036 } 1037 1038 /* set input flow control */ 1039 if ((iflag&IXOFF) != (old_iflag&IXOFF) 1040 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) { 1041 arg = 0; 1042 if (iflag&IXOFF) 1043 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1044 else 1045 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 1046 1047 if (cflag&CRTSCTS) { 1048 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 1049 1050 /* On USB-4 it is necessary to assert RTS prior */ 1051 /* to selecting RTS input flow control. */ 1052 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 1053 buf[i++] = priv->dp_port_num; 1054 buf[i++] = DIGI_RTS_ACTIVE; 1055 buf[i++] = 0; 1056 1057 } else { 1058 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 1059 } 1060 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1061 buf[i++] = priv->dp_port_num; 1062 buf[i++] = arg; 1063 buf[i++] = 0; 1064 } 1065 1066 /* set output flow control */ 1067 if ((iflag & IXON) != (old_iflag & IXON) 1068 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1069 arg = 0; 1070 if (iflag & IXON) 1071 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1072 else 1073 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 1074 1075 if (cflag & CRTSCTS) { 1076 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 1077 } else { 1078 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 1079 tty->hw_stopped = 0; 1080 } 1081 1082 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1083 buf[i++] = priv->dp_port_num; 1084 buf[i++] = arg; 1085 buf[i++] = 0; 1086 } 1087 1088 /* set receive enable/disable */ 1089 if ((cflag & CREAD) != (old_cflag & CREAD)) { 1090 if (cflag & CREAD) 1091 arg = DIGI_ENABLE; 1092 else 1093 arg = DIGI_DISABLE; 1094 1095 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 1096 buf[i++] = priv->dp_port_num; 1097 buf[i++] = arg; 1098 buf[i++] = 0; 1099 } 1100 ret = digi_write_oob_command(port, buf, i, 1); 1101 if (ret != 0) 1102 dbg("digi_set_termios: write oob failed, ret=%d", ret); 1103 tty_encode_baud_rate(tty, baud, baud); 1104 } 1105 1106 1107 static void digi_break_ctl(struct tty_struct *tty, int break_state) 1108 { 1109 struct usb_serial_port *port = tty->driver_data; 1110 unsigned char buf[4]; 1111 1112 buf[0] = DIGI_CMD_BREAK_CONTROL; 1113 buf[1] = 2; /* length */ 1114 buf[2] = break_state ? 1 : 0; 1115 buf[3] = 0; /* pad */ 1116 digi_write_inb_command(port, buf, 4, 0); 1117 } 1118 1119 1120 static int digi_tiocmget(struct tty_struct *tty, struct file *file) 1121 { 1122 struct usb_serial_port *port = tty->driver_data; 1123 struct digi_port *priv = usb_get_serial_port_data(port); 1124 unsigned int val; 1125 unsigned long flags; 1126 1127 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num); 1128 1129 spin_lock_irqsave(&priv->dp_port_lock, flags); 1130 val = priv->dp_modem_signals; 1131 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1132 return val; 1133 } 1134 1135 1136 static int digi_tiocmset(struct tty_struct *tty, struct file *file, 1137 unsigned int set, unsigned int clear) 1138 { 1139 struct usb_serial_port *port = tty->driver_data; 1140 struct digi_port *priv = usb_get_serial_port_data(port); 1141 unsigned int val; 1142 unsigned long flags; 1143 1144 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num); 1145 1146 spin_lock_irqsave(&priv->dp_port_lock, flags); 1147 val = (priv->dp_modem_signals & ~clear) | set; 1148 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1149 return digi_set_modem_signals(port, val, 1); 1150 } 1151 1152 1153 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 1154 const unsigned char *buf, int count) 1155 { 1156 1157 int ret, data_len, new_len; 1158 struct digi_port *priv = usb_get_serial_port_data(port); 1159 unsigned char *data = port->write_urb->transfer_buffer; 1160 unsigned long flags = 0; 1161 1162 dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", 1163 priv->dp_port_num, count, in_interrupt()); 1164 1165 /* copy user data (which can sleep) before getting spin lock */ 1166 count = min(count, port->bulk_out_size-2); 1167 count = min(64, count); 1168 1169 /* be sure only one write proceeds at a time */ 1170 /* there are races on the port private buffer */ 1171 /* and races to check write_urb->status */ 1172 spin_lock_irqsave(&priv->dp_port_lock, flags); 1173 1174 /* wait for urb status clear to submit another urb */ 1175 if (port->write_urb->status == -EINPROGRESS || 1176 priv->dp_write_urb_in_use) { 1177 /* buffer data if count is 1 (probably put_char) if possible */ 1178 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) { 1179 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 1180 new_len = 1; 1181 } else { 1182 new_len = 0; 1183 } 1184 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1185 return new_len; 1186 } 1187 1188 /* allow space for any buffered data and for new data, up to */ 1189 /* transfer buffer size - 2 (for command and length bytes) */ 1190 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 1191 data_len = new_len + priv->dp_out_buf_len; 1192 1193 if (data_len == 0) { 1194 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1195 return 0; 1196 } 1197 1198 port->write_urb->transfer_buffer_length = data_len+2; 1199 port->write_urb->dev = port->serial->dev; 1200 1201 *data++ = DIGI_CMD_SEND_DATA; 1202 *data++ = data_len; 1203 1204 /* copy in buffered data first */ 1205 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len); 1206 data += priv->dp_out_buf_len; 1207 1208 /* copy in new data */ 1209 memcpy(data, buf, new_len); 1210 1211 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1212 if (ret == 0) { 1213 priv->dp_write_urb_in_use = 1; 1214 ret = new_len; 1215 priv->dp_out_buf_len = 0; 1216 } 1217 1218 /* return length of new data written, or error */ 1219 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1220 if (ret < 0) 1221 dev_err(&port->dev, 1222 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1223 __func__, ret, priv->dp_port_num); 1224 dbg("digi_write: returning %d", ret); 1225 return ret; 1226 1227 } 1228 1229 static void digi_write_bulk_callback(struct urb *urb) 1230 { 1231 1232 struct usb_serial_port *port = urb->context; 1233 struct usb_serial *serial; 1234 struct digi_port *priv; 1235 struct digi_serial *serial_priv; 1236 int ret = 0; 1237 int status = urb->status; 1238 1239 dbg("digi_write_bulk_callback: TOP, urb->status=%d", status); 1240 1241 /* port and serial sanity check */ 1242 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { 1243 dev_err(&port->dev, 1244 "%s: port or port->private is NULL, status=%d\n", 1245 __func__, status); 1246 return; 1247 } 1248 serial = port->serial; 1249 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) { 1250 dev_err(&port->dev, 1251 "%s: serial or serial->private is NULL, status=%d\n", 1252 __func__, status); 1253 return; 1254 } 1255 1256 /* handle oob callback */ 1257 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1258 dbg("digi_write_bulk_callback: oob callback"); 1259 spin_lock(&priv->dp_port_lock); 1260 priv->dp_write_urb_in_use = 0; 1261 wake_up_interruptible(&port->write_wait); 1262 spin_unlock(&priv->dp_port_lock); 1263 return; 1264 } 1265 1266 /* try to send any buffered data on this port, if it is open */ 1267 spin_lock(&priv->dp_port_lock); 1268 priv->dp_write_urb_in_use = 0; 1269 if (port->port.count && port->write_urb->status != -EINPROGRESS 1270 && priv->dp_out_buf_len > 0) { 1271 *((unsigned char *)(port->write_urb->transfer_buffer)) 1272 = (unsigned char)DIGI_CMD_SEND_DATA; 1273 *((unsigned char *)(port->write_urb->transfer_buffer) + 1) 1274 = (unsigned char)priv->dp_out_buf_len; 1275 port->write_urb->transfer_buffer_length = 1276 priv->dp_out_buf_len + 2; 1277 port->write_urb->dev = serial->dev; 1278 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf, 1279 priv->dp_out_buf_len); 1280 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1281 if (ret == 0) { 1282 priv->dp_write_urb_in_use = 1; 1283 priv->dp_out_buf_len = 0; 1284 } 1285 } 1286 /* wake up processes sleeping on writes immediately */ 1287 digi_wakeup_write(port); 1288 /* also queue up a wakeup at scheduler time, in case we */ 1289 /* lost the race in write_chan(). */ 1290 schedule_work(&priv->dp_wakeup_work); 1291 1292 spin_unlock(&priv->dp_port_lock); 1293 if (ret) 1294 dev_err(&port->dev, 1295 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1296 __func__, ret, priv->dp_port_num); 1297 } 1298 1299 static int digi_write_room(struct tty_struct *tty) 1300 { 1301 struct usb_serial_port *port = tty->driver_data; 1302 struct digi_port *priv = usb_get_serial_port_data(port); 1303 int room; 1304 unsigned long flags = 0; 1305 1306 spin_lock_irqsave(&priv->dp_port_lock, flags); 1307 1308 if (port->write_urb->status == -EINPROGRESS || 1309 priv->dp_write_urb_in_use) 1310 room = 0; 1311 else 1312 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1313 1314 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1315 dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room); 1316 return room; 1317 1318 } 1319 1320 static int digi_chars_in_buffer(struct tty_struct *tty) 1321 { 1322 struct usb_serial_port *port = tty->driver_data; 1323 struct digi_port *priv = usb_get_serial_port_data(port); 1324 1325 if (port->write_urb->status == -EINPROGRESS 1326 || priv->dp_write_urb_in_use) { 1327 dbg("digi_chars_in_buffer: port=%d, chars=%d", 1328 priv->dp_port_num, port->bulk_out_size - 2); 1329 /* return(port->bulk_out_size - 2); */ 1330 return 256; 1331 } else { 1332 dbg("digi_chars_in_buffer: port=%d, chars=%d", 1333 priv->dp_port_num, priv->dp_out_buf_len); 1334 return priv->dp_out_buf_len; 1335 } 1336 1337 } 1338 1339 1340 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port, 1341 struct file *filp) 1342 { 1343 int ret; 1344 unsigned char buf[32]; 1345 struct digi_port *priv = usb_get_serial_port_data(port); 1346 struct ktermios not_termios; 1347 unsigned long flags = 0; 1348 1349 dbg("digi_open: TOP: port=%d, open_count=%d", 1350 priv->dp_port_num, port->port.count); 1351 1352 /* be sure the device is started up */ 1353 if (digi_startup_device(port->serial) != 0) 1354 return -ENXIO; 1355 1356 spin_lock_irqsave(&priv->dp_port_lock, flags); 1357 1358 /* don't wait on a close in progress for non-blocking opens */ 1359 if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) { 1360 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1361 return -EAGAIN; 1362 } 1363 1364 /* wait for a close in progress to finish */ 1365 while (priv->dp_in_close) { 1366 cond_wait_interruptible_timeout_irqrestore( 1367 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT, 1368 &priv->dp_port_lock, flags); 1369 if (signal_pending(current)) 1370 return -EINTR; 1371 spin_lock_irqsave(&priv->dp_port_lock, flags); 1372 } 1373 1374 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1375 1376 /* read modem signals automatically whenever they change */ 1377 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1378 buf[1] = priv->dp_port_num; 1379 buf[2] = DIGI_ENABLE; 1380 buf[3] = 0; 1381 1382 /* flush fifos */ 1383 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1384 buf[5] = priv->dp_port_num; 1385 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1386 buf[7] = 0; 1387 1388 ret = digi_write_oob_command(port, buf, 8, 1); 1389 if (ret != 0) 1390 dbg("digi_open: write oob failed, ret=%d", ret); 1391 1392 /* set termios settings */ 1393 if (tty) { 1394 not_termios.c_cflag = ~tty->termios->c_cflag; 1395 not_termios.c_iflag = ~tty->termios->c_iflag; 1396 digi_set_termios(tty, port, ¬_termios); 1397 } 1398 1399 /* set DTR and RTS */ 1400 digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1); 1401 1402 return 0; 1403 } 1404 1405 1406 static void digi_close(struct tty_struct *tty, struct usb_serial_port *port, 1407 struct file *filp) 1408 { 1409 DEFINE_WAIT(wait); 1410 int ret; 1411 unsigned char buf[32]; 1412 struct digi_port *priv = usb_get_serial_port_data(port); 1413 1414 dbg("digi_close: TOP: port=%d, open_count=%d", 1415 priv->dp_port_num, port->port.count); 1416 1417 mutex_lock(&port->serial->disc_mutex); 1418 /* if disconnected, just clear flags */ 1419 if (port->serial->disconnected) 1420 goto exit; 1421 1422 /* do cleanup only after final close on this port */ 1423 spin_lock_irq(&priv->dp_port_lock); 1424 priv->dp_in_close = 1; 1425 spin_unlock_irq(&priv->dp_port_lock); 1426 1427 /* tell line discipline to process only XON/XOFF */ 1428 tty->closing = 1; 1429 1430 /* wait for output to drain */ 1431 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) 1432 tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT); 1433 1434 /* flush driver and line discipline buffers */ 1435 tty_driver_flush_buffer(tty); 1436 tty_ldisc_flush(tty); 1437 1438 if (port->serial->dev) { 1439 /* wait for transmit idle */ 1440 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) 1441 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT); 1442 /* drop DTR and RTS */ 1443 digi_set_modem_signals(port, 0, 0); 1444 1445 /* disable input flow control */ 1446 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1447 buf[1] = priv->dp_port_num; 1448 buf[2] = DIGI_DISABLE; 1449 buf[3] = 0; 1450 1451 /* disable output flow control */ 1452 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1453 buf[5] = priv->dp_port_num; 1454 buf[6] = DIGI_DISABLE; 1455 buf[7] = 0; 1456 1457 /* disable reading modem signals automatically */ 1458 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1459 buf[9] = priv->dp_port_num; 1460 buf[10] = DIGI_DISABLE; 1461 buf[11] = 0; 1462 1463 /* disable receive */ 1464 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1465 buf[13] = priv->dp_port_num; 1466 buf[14] = DIGI_DISABLE; 1467 buf[15] = 0; 1468 1469 /* flush fifos */ 1470 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1471 buf[17] = priv->dp_port_num; 1472 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1473 buf[19] = 0; 1474 1475 ret = digi_write_oob_command(port, buf, 20, 0); 1476 if (ret != 0) 1477 dbg("digi_close: write oob failed, ret=%d", ret); 1478 1479 /* wait for final commands on oob port to complete */ 1480 prepare_to_wait(&priv->dp_flush_wait, &wait, 1481 TASK_INTERRUPTIBLE); 1482 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1483 finish_wait(&priv->dp_flush_wait, &wait); 1484 1485 /* shutdown any outstanding bulk writes */ 1486 usb_kill_urb(port->write_urb); 1487 } 1488 tty->closing = 0; 1489 exit: 1490 spin_lock_irq(&priv->dp_port_lock); 1491 priv->dp_write_urb_in_use = 0; 1492 priv->dp_in_close = 0; 1493 wake_up_interruptible(&priv->dp_close_wait); 1494 spin_unlock_irq(&priv->dp_port_lock); 1495 mutex_unlock(&port->serial->disc_mutex); 1496 dbg("digi_close: done"); 1497 } 1498 1499 1500 /* 1501 * Digi Startup Device 1502 * 1503 * Starts reads on all ports. Must be called AFTER startup, with 1504 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1505 */ 1506 1507 static int digi_startup_device(struct usb_serial *serial) 1508 { 1509 int i, ret = 0; 1510 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1511 struct usb_serial_port *port; 1512 1513 /* be sure this happens exactly once */ 1514 spin_lock(&serial_priv->ds_serial_lock); 1515 if (serial_priv->ds_device_started) { 1516 spin_unlock(&serial_priv->ds_serial_lock); 1517 return 0; 1518 } 1519 serial_priv->ds_device_started = 1; 1520 spin_unlock(&serial_priv->ds_serial_lock); 1521 1522 /* start reading from each bulk in endpoint for the device */ 1523 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1524 for (i = 0; i < serial->type->num_ports + 1; i++) { 1525 port = serial->port[i]; 1526 port->write_urb->dev = port->serial->dev; 1527 ret = usb_submit_urb(port->read_urb, GFP_KERNEL); 1528 if (ret != 0) { 1529 dev_err(&port->dev, 1530 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1531 __func__, ret, i); 1532 break; 1533 } 1534 } 1535 return ret; 1536 } 1537 1538 1539 static int digi_startup(struct usb_serial *serial) 1540 { 1541 1542 int i; 1543 struct digi_port *priv; 1544 struct digi_serial *serial_priv; 1545 1546 dbg("digi_startup: TOP"); 1547 1548 /* allocate the private data structures for all ports */ 1549 /* number of regular ports + 1 for the out-of-band port */ 1550 for (i = 0; i < serial->type->num_ports + 1; i++) { 1551 /* allocate port private structure */ 1552 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL); 1553 if (priv == NULL) { 1554 while (--i >= 0) 1555 kfree(usb_get_serial_port_data(serial->port[i])); 1556 return 1; /* error */ 1557 } 1558 1559 /* initialize port private structure */ 1560 spin_lock_init(&priv->dp_port_lock); 1561 priv->dp_port_num = i; 1562 priv->dp_out_buf_len = 0; 1563 priv->dp_write_urb_in_use = 0; 1564 priv->dp_modem_signals = 0; 1565 init_waitqueue_head(&priv->dp_modem_change_wait); 1566 priv->dp_transmit_idle = 0; 1567 init_waitqueue_head(&priv->dp_transmit_idle_wait); 1568 priv->dp_throttled = 0; 1569 priv->dp_throttle_restart = 0; 1570 init_waitqueue_head(&priv->dp_flush_wait); 1571 priv->dp_in_close = 0; 1572 init_waitqueue_head(&priv->dp_close_wait); 1573 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); 1574 priv->dp_port = serial->port[i]; 1575 /* initialize write wait queue for this port */ 1576 init_waitqueue_head(&serial->port[i]->write_wait); 1577 1578 usb_set_serial_port_data(serial->port[i], priv); 1579 } 1580 1581 /* allocate serial private structure */ 1582 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL); 1583 if (serial_priv == NULL) { 1584 for (i = 0; i < serial->type->num_ports + 1; i++) 1585 kfree(usb_get_serial_port_data(serial->port[i])); 1586 return 1; /* error */ 1587 } 1588 1589 /* initialize serial private structure */ 1590 spin_lock_init(&serial_priv->ds_serial_lock); 1591 serial_priv->ds_oob_port_num = serial->type->num_ports; 1592 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1593 serial_priv->ds_device_started = 0; 1594 usb_set_serial_data(serial, serial_priv); 1595 1596 return 0; 1597 } 1598 1599 1600 static void digi_shutdown(struct usb_serial *serial) 1601 { 1602 int i; 1603 dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt()); 1604 1605 /* stop reads and writes on all ports */ 1606 for (i = 0; i < serial->type->num_ports + 1; i++) { 1607 usb_kill_urb(serial->port[i]->read_urb); 1608 usb_kill_urb(serial->port[i]->write_urb); 1609 } 1610 1611 /* free the private data structures for all ports */ 1612 /* number of regular ports + 1 for the out-of-band port */ 1613 for (i = 0; i < serial->type->num_ports + 1; i++) 1614 kfree(usb_get_serial_port_data(serial->port[i])); 1615 kfree(usb_get_serial_data(serial)); 1616 } 1617 1618 1619 static void digi_read_bulk_callback(struct urb *urb) 1620 { 1621 struct usb_serial_port *port = urb->context; 1622 struct digi_port *priv; 1623 struct digi_serial *serial_priv; 1624 int ret; 1625 int status = urb->status; 1626 1627 dbg("digi_read_bulk_callback: TOP"); 1628 1629 /* port sanity check, do not resubmit if port is not valid */ 1630 if (port == NULL) 1631 return; 1632 priv = usb_get_serial_port_data(port); 1633 if (priv == NULL) { 1634 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n", 1635 __func__, status); 1636 return; 1637 } 1638 if (port->serial == NULL || 1639 (serial_priv = usb_get_serial_data(port->serial)) == NULL) { 1640 dev_err(&port->dev, "%s: serial is bad or serial->private " 1641 "is NULL, status=%d\n", __func__, status); 1642 return; 1643 } 1644 1645 /* do not resubmit urb if it has any status error */ 1646 if (status) { 1647 dev_err(&port->dev, 1648 "%s: nonzero read bulk status: status=%d, port=%d\n", 1649 __func__, status, priv->dp_port_num); 1650 return; 1651 } 1652 1653 /* handle oob or inb callback, do not resubmit if error */ 1654 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1655 if (digi_read_oob_callback(urb) != 0) 1656 return; 1657 } else { 1658 if (digi_read_inb_callback(urb) != 0) 1659 return; 1660 } 1661 1662 /* continue read */ 1663 urb->dev = port->serial->dev; 1664 ret = usb_submit_urb(urb, GFP_ATOMIC); 1665 if (ret != 0) { 1666 dev_err(&port->dev, 1667 "%s: failed resubmitting urb, ret=%d, port=%d\n", 1668 __func__, ret, priv->dp_port_num); 1669 } 1670 1671 } 1672 1673 /* 1674 * Digi Read INB Callback 1675 * 1676 * Digi Read INB Callback handles reads on the in band ports, sending 1677 * the data on to the tty subsystem. When called we know port and 1678 * port->private are not NULL and port->serial has been validated. 1679 * It returns 0 if successful, 1 if successful but the port is 1680 * throttled, and -1 if the sanity checks failed. 1681 */ 1682 1683 static int digi_read_inb_callback(struct urb *urb) 1684 { 1685 1686 struct usb_serial_port *port = urb->context; 1687 struct tty_struct *tty; 1688 struct digi_port *priv = usb_get_serial_port_data(port); 1689 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1690 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1691 int port_status = ((unsigned char *)urb->transfer_buffer)[2]; 1692 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3; 1693 int flag, throttled; 1694 int i; 1695 int status = urb->status; 1696 1697 /* do not process callbacks on closed ports */ 1698 /* but do continue the read chain */ 1699 if (port->port.count == 0) 1700 return 0; 1701 1702 /* short/multiple packet check */ 1703 if (urb->actual_length != len + 2) { 1704 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, " 1705 "urb->status=%d, port=%d, opcode=%d, len=%d, " 1706 "actual_length=%d, status=%d\n", __func__, status, 1707 priv->dp_port_num, opcode, len, urb->actual_length, 1708 port_status); 1709 return -1; 1710 } 1711 1712 tty = tty_port_tty_get(&port->port); 1713 spin_lock(&priv->dp_port_lock); 1714 1715 /* check for throttle; if set, do not resubmit read urb */ 1716 /* indicate the read chain needs to be restarted on unthrottle */ 1717 throttled = priv->dp_throttled; 1718 if (throttled) 1719 priv->dp_throttle_restart = 1; 1720 1721 /* receive data */ 1722 if (opcode == DIGI_CMD_RECEIVE_DATA) { 1723 /* get flag from port_status */ 1724 flag = 0; 1725 1726 /* overrun is special, not associated with a char */ 1727 if (port_status & DIGI_OVERRUN_ERROR) 1728 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 1729 1730 /* break takes precedence over parity, */ 1731 /* which takes precedence over framing errors */ 1732 if (port_status & DIGI_BREAK_ERROR) 1733 flag = TTY_BREAK; 1734 else if (port_status & DIGI_PARITY_ERROR) 1735 flag = TTY_PARITY; 1736 else if (port_status & DIGI_FRAMING_ERROR) 1737 flag = TTY_FRAME; 1738 1739 /* data length is len-1 (one byte of len is port_status) */ 1740 --len; 1741 1742 len = tty_buffer_request_room(tty, len); 1743 if (len > 0) { 1744 /* Hot path */ 1745 if (flag == TTY_NORMAL) 1746 tty_insert_flip_string(tty, data, len); 1747 else { 1748 for (i = 0; i < len; i++) 1749 tty_insert_flip_char(tty, 1750 data[i], flag); 1751 } 1752 tty_flip_buffer_push(tty); 1753 } 1754 } 1755 spin_unlock(&priv->dp_port_lock); 1756 tty_kref_put(tty); 1757 1758 if (opcode == DIGI_CMD_RECEIVE_DISABLE) 1759 dbg("%s: got RECEIVE_DISABLE", __func__); 1760 else if (opcode != DIGI_CMD_RECEIVE_DATA) 1761 dbg("%s: unknown opcode: %d", __func__, opcode); 1762 1763 return throttled ? 1 : 0; 1764 1765 } 1766 1767 1768 /* 1769 * Digi Read OOB Callback 1770 * 1771 * Digi Read OOB Callback handles reads on the out of band port. 1772 * When called we know port and port->private are not NULL and 1773 * the port->serial is valid. It returns 0 if successful, and 1774 * -1 if the sanity checks failed. 1775 */ 1776 1777 static int digi_read_oob_callback(struct urb *urb) 1778 { 1779 1780 struct usb_serial_port *port = urb->context; 1781 struct usb_serial *serial = port->serial; 1782 struct tty_struct *tty; 1783 struct digi_port *priv = usb_get_serial_port_data(port); 1784 int opcode, line, status, val; 1785 int i; 1786 unsigned int rts; 1787 1788 dbg("digi_read_oob_callback: port=%d, len=%d", 1789 priv->dp_port_num, urb->actual_length); 1790 1791 /* handle each oob command */ 1792 for (i = 0; i < urb->actual_length - 3;) { 1793 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1794 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1795 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1796 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1797 1798 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", 1799 opcode, line, status, val); 1800 1801 if (status != 0 || line >= serial->type->num_ports) 1802 continue; 1803 1804 port = serial->port[line]; 1805 1806 priv = usb_get_serial_port_data(port); 1807 if (priv == NULL) 1808 return -1; 1809 1810 tty = tty_port_tty_get(&port->port); 1811 rts = 0; 1812 if (port->port.count) 1813 rts = tty->termios->c_cflag & CRTSCTS; 1814 1815 if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) { 1816 spin_lock(&priv->dp_port_lock); 1817 /* convert from digi flags to termiox flags */ 1818 if (val & DIGI_READ_INPUT_SIGNALS_CTS) { 1819 priv->dp_modem_signals |= TIOCM_CTS; 1820 /* port must be open to use tty struct */ 1821 if (rts) { 1822 tty->hw_stopped = 0; 1823 digi_wakeup_write(port); 1824 } 1825 } else { 1826 priv->dp_modem_signals &= ~TIOCM_CTS; 1827 /* port must be open to use tty struct */ 1828 if (rts) 1829 tty->hw_stopped = 1; 1830 } 1831 if (val & DIGI_READ_INPUT_SIGNALS_DSR) 1832 priv->dp_modem_signals |= TIOCM_DSR; 1833 else 1834 priv->dp_modem_signals &= ~TIOCM_DSR; 1835 if (val & DIGI_READ_INPUT_SIGNALS_RI) 1836 priv->dp_modem_signals |= TIOCM_RI; 1837 else 1838 priv->dp_modem_signals &= ~TIOCM_RI; 1839 if (val & DIGI_READ_INPUT_SIGNALS_DCD) 1840 priv->dp_modem_signals |= TIOCM_CD; 1841 else 1842 priv->dp_modem_signals &= ~TIOCM_CD; 1843 1844 wake_up_interruptible(&priv->dp_modem_change_wait); 1845 spin_unlock(&priv->dp_port_lock); 1846 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { 1847 spin_lock(&priv->dp_port_lock); 1848 priv->dp_transmit_idle = 1; 1849 wake_up_interruptible(&priv->dp_transmit_idle_wait); 1850 spin_unlock(&priv->dp_port_lock); 1851 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) { 1852 wake_up_interruptible(&priv->dp_flush_wait); 1853 } 1854 tty_kref_put(tty); 1855 } 1856 return 0; 1857 1858 } 1859 1860 static int __init digi_init(void) 1861 { 1862 int retval; 1863 retval = usb_serial_register(&digi_acceleport_2_device); 1864 if (retval) 1865 goto failed_acceleport_2_device; 1866 retval = usb_serial_register(&digi_acceleport_4_device); 1867 if (retval) 1868 goto failed_acceleport_4_device; 1869 retval = usb_register(&digi_driver); 1870 if (retval) 1871 goto failed_usb_register; 1872 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1873 DRIVER_DESC "\n"); 1874 return 0; 1875 failed_usb_register: 1876 usb_serial_deregister(&digi_acceleport_4_device); 1877 failed_acceleport_4_device: 1878 usb_serial_deregister(&digi_acceleport_2_device); 1879 failed_acceleport_2_device: 1880 return retval; 1881 } 1882 1883 static void __exit digi_exit (void) 1884 { 1885 usb_deregister(&digi_driver); 1886 usb_serial_deregister(&digi_acceleport_2_device); 1887 usb_serial_deregister(&digi_acceleport_4_device); 1888 } 1889 1890 1891 module_init(digi_init); 1892 module_exit(digi_exit); 1893 1894 1895 MODULE_AUTHOR(DRIVER_AUTHOR); 1896 MODULE_DESCRIPTION(DRIVER_DESC); 1897 MODULE_LICENSE("GPL"); 1898 1899 module_param(debug, bool, S_IRUGO | S_IWUSR); 1900 MODULE_PARM_DESC(debug, "Debug enabled or not"); 1901