1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * USB Cypress M8 driver 4 * 5 * Copyright (C) 2004 6 * Lonnie Mendez (dignome@gmail.com) 7 * Copyright (C) 2003,2004 8 * Neil Whelchel (koyama@firstlight.net) 9 * 10 * See Documentation/usb/usb-serial.rst for more information on using this 11 * driver 12 * 13 * See http://geocities.com/i0xox0i for information on this driver and the 14 * earthmate usb device. 15 */ 16 17 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation 18 for linux. */ 19 /* Thanks to cypress for providing references for the hid reports. */ 20 /* Thanks to Jiang Zhang for providing links and for general help. */ 21 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/ 22 23 24 #include <linux/kernel.h> 25 #include <linux/errno.h> 26 #include <linux/slab.h> 27 #include <linux/tty.h> 28 #include <linux/tty_driver.h> 29 #include <linux/tty_flip.h> 30 #include <linux/module.h> 31 #include <linux/moduleparam.h> 32 #include <linux/spinlock.h> 33 #include <linux/usb.h> 34 #include <linux/usb/serial.h> 35 #include <linux/serial.h> 36 #include <linux/kfifo.h> 37 #include <linux/delay.h> 38 #include <linux/uaccess.h> 39 #include <asm/unaligned.h> 40 41 #include "cypress_m8.h" 42 43 44 static bool stats; 45 static int interval; 46 static bool unstable_bauds; 47 48 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>" 49 #define DRIVER_DESC "Cypress USB to Serial Driver" 50 51 /* write buffer size defines */ 52 #define CYPRESS_BUF_SIZE 1024 53 54 static const struct usb_device_id id_table_earthmate[] = { 55 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 56 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 57 { } /* Terminating entry */ 58 }; 59 60 static const struct usb_device_id id_table_cyphidcomrs232[] = { 61 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 62 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 63 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 64 { } /* Terminating entry */ 65 }; 66 67 static const struct usb_device_id id_table_nokiaca42v2[] = { 68 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 69 { } /* Terminating entry */ 70 }; 71 72 static const struct usb_device_id id_table_combined[] = { 73 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 75 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 76 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 77 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 78 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 79 { } /* Terminating entry */ 80 }; 81 82 MODULE_DEVICE_TABLE(usb, id_table_combined); 83 84 enum packet_format { 85 packet_format_1, /* b0:status, b1:payload count */ 86 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ 87 }; 88 89 struct cypress_private { 90 spinlock_t lock; /* private lock */ 91 int chiptype; /* identifier of device, for quirks/etc */ 92 int bytes_in; /* used for statistics */ 93 int bytes_out; /* used for statistics */ 94 int cmd_count; /* used for statistics */ 95 int cmd_ctrl; /* always set this to 1 before issuing a command */ 96 struct kfifo write_fifo; /* write fifo */ 97 int write_urb_in_use; /* write urb in use indicator */ 98 int write_urb_interval; /* interval to use for write urb */ 99 int read_urb_interval; /* interval to use for read urb */ 100 int comm_is_ok; /* true if communication is (still) ok */ 101 __u8 line_control; /* holds dtr / rts value */ 102 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ 103 __u8 current_config; /* stores the current configuration byte */ 104 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ 105 enum packet_format pkt_fmt; /* format to use for packet send / receive */ 106 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ 107 int baud_rate; /* stores current baud rate in 108 integer form */ 109 char prev_status; /* used for TIOCMIWAIT */ 110 }; 111 112 /* function prototypes for the Cypress USB to serial device */ 113 static int cypress_earthmate_port_probe(struct usb_serial_port *port); 114 static int cypress_hidcom_port_probe(struct usb_serial_port *port); 115 static int cypress_ca42v2_port_probe(struct usb_serial_port *port); 116 static int cypress_port_remove(struct usb_serial_port *port); 117 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); 118 static void cypress_close(struct usb_serial_port *port); 119 static void cypress_dtr_rts(struct usb_serial_port *port, int on); 120 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 121 const unsigned char *buf, int count); 122 static void cypress_send(struct usb_serial_port *port); 123 static int cypress_write_room(struct tty_struct *tty); 124 static void cypress_earthmate_init_termios(struct tty_struct *tty); 125 static void cypress_set_termios(struct tty_struct *tty, 126 struct usb_serial_port *port, struct ktermios *old); 127 static int cypress_tiocmget(struct tty_struct *tty); 128 static int cypress_tiocmset(struct tty_struct *tty, 129 unsigned int set, unsigned int clear); 130 static int cypress_chars_in_buffer(struct tty_struct *tty); 131 static void cypress_throttle(struct tty_struct *tty); 132 static void cypress_unthrottle(struct tty_struct *tty); 133 static void cypress_set_dead(struct usb_serial_port *port); 134 static void cypress_read_int_callback(struct urb *urb); 135 static void cypress_write_int_callback(struct urb *urb); 136 137 static struct usb_serial_driver cypress_earthmate_device = { 138 .driver = { 139 .owner = THIS_MODULE, 140 .name = "earthmate", 141 }, 142 .description = "DeLorme Earthmate USB", 143 .id_table = id_table_earthmate, 144 .num_ports = 1, 145 .port_probe = cypress_earthmate_port_probe, 146 .port_remove = cypress_port_remove, 147 .open = cypress_open, 148 .close = cypress_close, 149 .dtr_rts = cypress_dtr_rts, 150 .write = cypress_write, 151 .write_room = cypress_write_room, 152 .init_termios = cypress_earthmate_init_termios, 153 .set_termios = cypress_set_termios, 154 .tiocmget = cypress_tiocmget, 155 .tiocmset = cypress_tiocmset, 156 .tiocmiwait = usb_serial_generic_tiocmiwait, 157 .chars_in_buffer = cypress_chars_in_buffer, 158 .throttle = cypress_throttle, 159 .unthrottle = cypress_unthrottle, 160 .read_int_callback = cypress_read_int_callback, 161 .write_int_callback = cypress_write_int_callback, 162 }; 163 164 static struct usb_serial_driver cypress_hidcom_device = { 165 .driver = { 166 .owner = THIS_MODULE, 167 .name = "cyphidcom", 168 }, 169 .description = "HID->COM RS232 Adapter", 170 .id_table = id_table_cyphidcomrs232, 171 .num_ports = 1, 172 .port_probe = cypress_hidcom_port_probe, 173 .port_remove = cypress_port_remove, 174 .open = cypress_open, 175 .close = cypress_close, 176 .dtr_rts = cypress_dtr_rts, 177 .write = cypress_write, 178 .write_room = cypress_write_room, 179 .set_termios = cypress_set_termios, 180 .tiocmget = cypress_tiocmget, 181 .tiocmset = cypress_tiocmset, 182 .tiocmiwait = usb_serial_generic_tiocmiwait, 183 .chars_in_buffer = cypress_chars_in_buffer, 184 .throttle = cypress_throttle, 185 .unthrottle = cypress_unthrottle, 186 .read_int_callback = cypress_read_int_callback, 187 .write_int_callback = cypress_write_int_callback, 188 }; 189 190 static struct usb_serial_driver cypress_ca42v2_device = { 191 .driver = { 192 .owner = THIS_MODULE, 193 .name = "nokiaca42v2", 194 }, 195 .description = "Nokia CA-42 V2 Adapter", 196 .id_table = id_table_nokiaca42v2, 197 .num_ports = 1, 198 .port_probe = cypress_ca42v2_port_probe, 199 .port_remove = cypress_port_remove, 200 .open = cypress_open, 201 .close = cypress_close, 202 .dtr_rts = cypress_dtr_rts, 203 .write = cypress_write, 204 .write_room = cypress_write_room, 205 .set_termios = cypress_set_termios, 206 .tiocmget = cypress_tiocmget, 207 .tiocmset = cypress_tiocmset, 208 .tiocmiwait = usb_serial_generic_tiocmiwait, 209 .chars_in_buffer = cypress_chars_in_buffer, 210 .throttle = cypress_throttle, 211 .unthrottle = cypress_unthrottle, 212 .read_int_callback = cypress_read_int_callback, 213 .write_int_callback = cypress_write_int_callback, 214 }; 215 216 static struct usb_serial_driver * const serial_drivers[] = { 217 &cypress_earthmate_device, &cypress_hidcom_device, 218 &cypress_ca42v2_device, NULL 219 }; 220 221 /***************************************************************************** 222 * Cypress serial helper functions 223 *****************************************************************************/ 224 225 /* FRWD Dongle hidcom needs to skip reset and speed checks */ 226 static inline bool is_frwd(struct usb_device *dev) 227 { 228 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) && 229 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD)); 230 } 231 232 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) 233 { 234 struct cypress_private *priv; 235 priv = usb_get_serial_port_data(port); 236 237 if (unstable_bauds) 238 return new_rate; 239 240 /* FRWD Dongle uses 115200 bps */ 241 if (is_frwd(port->serial->dev)) 242 return new_rate; 243 244 /* 245 * The general purpose firmware for the Cypress M8 allows for 246 * a maximum speed of 57600bps (I have no idea whether DeLorme 247 * chose to use the general purpose firmware or not), if you 248 * need to modify this speed setting for your own project 249 * please add your own chiptype and modify the code likewise. 250 * The Cypress HID->COM device will work successfully up to 251 * 115200bps (but the actual throughput is around 3kBps). 252 */ 253 if (port->serial->dev->speed == USB_SPEED_LOW) { 254 /* 255 * Mike Isely <isely@pobox.com> 2-Feb-2008: The 256 * Cypress app note that describes this mechanism 257 * states the the low-speed part can't handle more 258 * than 800 bytes/sec, in which case 4800 baud is the 259 * safest speed for a part like that. 260 */ 261 if (new_rate > 4800) { 262 dev_dbg(&port->dev, 263 "%s - failed setting baud rate, device incapable speed %d\n", 264 __func__, new_rate); 265 return -1; 266 } 267 } 268 switch (priv->chiptype) { 269 case CT_EARTHMATE: 270 if (new_rate <= 600) { 271 /* 300 and 600 baud rates are supported under 272 * the generic firmware, but are not used with 273 * NMEA and SiRF protocols */ 274 dev_dbg(&port->dev, 275 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n", 276 __func__, new_rate); 277 return -1; 278 } 279 break; 280 default: 281 break; 282 } 283 return new_rate; 284 } 285 286 287 /* This function can either set or retrieve the current serial line settings */ 288 static int cypress_serial_control(struct tty_struct *tty, 289 struct usb_serial_port *port, speed_t baud_rate, int data_bits, 290 int stop_bits, int parity_enable, int parity_type, int reset, 291 int cypress_request_type) 292 { 293 int new_baudrate = 0, retval = 0, tries = 0; 294 struct cypress_private *priv; 295 struct device *dev = &port->dev; 296 u8 *feature_buffer; 297 const unsigned int feature_len = 5; 298 unsigned long flags; 299 300 priv = usb_get_serial_port_data(port); 301 302 if (!priv->comm_is_ok) 303 return -ENODEV; 304 305 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL); 306 if (!feature_buffer) 307 return -ENOMEM; 308 309 switch (cypress_request_type) { 310 case CYPRESS_SET_CONFIG: 311 /* 0 means 'Hang up' so doesn't change the true bit rate */ 312 new_baudrate = priv->baud_rate; 313 if (baud_rate && baud_rate != priv->baud_rate) { 314 dev_dbg(dev, "%s - baud rate is changing\n", __func__); 315 retval = analyze_baud_rate(port, baud_rate); 316 if (retval >= 0) { 317 new_baudrate = retval; 318 dev_dbg(dev, "%s - New baud rate set to %d\n", 319 __func__, new_baudrate); 320 } 321 } 322 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__, 323 new_baudrate); 324 325 /* fill the feature_buffer with new configuration */ 326 put_unaligned_le32(new_baudrate, feature_buffer); 327 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */ 328 /* 1 bit gap */ 329 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */ 330 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */ 331 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */ 332 /* 1 bit gap */ 333 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ 334 335 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__); 336 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__, 337 feature_buffer[0], feature_buffer[1], 338 feature_buffer[2], feature_buffer[3], 339 feature_buffer[4]); 340 341 do { 342 retval = usb_control_msg(port->serial->dev, 343 usb_sndctrlpipe(port->serial->dev, 0), 344 HID_REQ_SET_REPORT, 345 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 346 0x0300, 0, feature_buffer, 347 feature_len, 500); 348 349 if (tries++ >= 3) 350 break; 351 352 } while (retval != feature_len && 353 retval != -ENODEV); 354 355 if (retval != feature_len) { 356 dev_err(dev, "%s - failed sending serial line settings - %d\n", 357 __func__, retval); 358 cypress_set_dead(port); 359 } else { 360 spin_lock_irqsave(&priv->lock, flags); 361 priv->baud_rate = new_baudrate; 362 priv->current_config = feature_buffer[4]; 363 spin_unlock_irqrestore(&priv->lock, flags); 364 /* If we asked for a speed change encode it */ 365 if (baud_rate) 366 tty_encode_baud_rate(tty, 367 new_baudrate, new_baudrate); 368 } 369 break; 370 case CYPRESS_GET_CONFIG: 371 if (priv->get_cfg_unsafe) { 372 /* Not implemented for this device, 373 and if we try to do it we're likely 374 to crash the hardware. */ 375 retval = -ENOTTY; 376 goto out; 377 } 378 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__); 379 do { 380 retval = usb_control_msg(port->serial->dev, 381 usb_rcvctrlpipe(port->serial->dev, 0), 382 HID_REQ_GET_REPORT, 383 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 384 0x0300, 0, feature_buffer, 385 feature_len, 500); 386 387 if (tries++ >= 3) 388 break; 389 } while (retval != feature_len 390 && retval != -ENODEV); 391 392 if (retval != feature_len) { 393 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n", 394 __func__, retval); 395 cypress_set_dead(port); 396 goto out; 397 } else { 398 spin_lock_irqsave(&priv->lock, flags); 399 /* store the config in one byte, and later 400 use bit masks to check values */ 401 priv->current_config = feature_buffer[4]; 402 priv->baud_rate = get_unaligned_le32(feature_buffer); 403 spin_unlock_irqrestore(&priv->lock, flags); 404 } 405 } 406 spin_lock_irqsave(&priv->lock, flags); 407 ++priv->cmd_count; 408 spin_unlock_irqrestore(&priv->lock, flags); 409 out: 410 kfree(feature_buffer); 411 return retval; 412 } /* cypress_serial_control */ 413 414 415 static void cypress_set_dead(struct usb_serial_port *port) 416 { 417 struct cypress_private *priv = usb_get_serial_port_data(port); 418 unsigned long flags; 419 420 spin_lock_irqsave(&priv->lock, flags); 421 if (!priv->comm_is_ok) { 422 spin_unlock_irqrestore(&priv->lock, flags); 423 return; 424 } 425 priv->comm_is_ok = 0; 426 spin_unlock_irqrestore(&priv->lock, flags); 427 428 dev_err(&port->dev, "cypress_m8 suspending failing port %d - " 429 "interval might be too short\n", port->port_number); 430 } 431 432 433 /***************************************************************************** 434 * Cypress serial driver functions 435 *****************************************************************************/ 436 437 438 static int cypress_generic_port_probe(struct usb_serial_port *port) 439 { 440 struct usb_serial *serial = port->serial; 441 struct cypress_private *priv; 442 443 if (!port->interrupt_out_urb || !port->interrupt_in_urb) { 444 dev_err(&port->dev, "required endpoint is missing\n"); 445 return -ENODEV; 446 } 447 448 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL); 449 if (!priv) 450 return -ENOMEM; 451 452 priv->comm_is_ok = !0; 453 spin_lock_init(&priv->lock); 454 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { 455 kfree(priv); 456 return -ENOMEM; 457 } 458 459 /* Skip reset for FRWD device. It is a workaound: 460 device hangs if it receives SET_CONFIGURE in Configured 461 state. */ 462 if (!is_frwd(serial->dev)) 463 usb_reset_configuration(serial->dev); 464 465 priv->cmd_ctrl = 0; 466 priv->line_control = 0; 467 priv->rx_flags = 0; 468 /* Default packet format setting is determined by packet size. 469 Anything with a size larger then 9 must have a separate 470 count field since the 3 bit count field is otherwise too 471 small. Otherwise we can use the slightly more compact 472 format. This is in accordance with the cypress_m8 serial 473 converter app note. */ 474 if (port->interrupt_out_size > 9) 475 priv->pkt_fmt = packet_format_1; 476 else 477 priv->pkt_fmt = packet_format_2; 478 479 if (interval > 0) { 480 priv->write_urb_interval = interval; 481 priv->read_urb_interval = interval; 482 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n", 483 __func__, interval); 484 } else { 485 priv->write_urb_interval = port->interrupt_out_urb->interval; 486 priv->read_urb_interval = port->interrupt_in_urb->interval; 487 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n", 488 __func__, priv->read_urb_interval, 489 priv->write_urb_interval); 490 } 491 usb_set_serial_port_data(port, priv); 492 493 port->port.drain_delay = 256; 494 495 return 0; 496 } 497 498 499 static int cypress_earthmate_port_probe(struct usb_serial_port *port) 500 { 501 struct usb_serial *serial = port->serial; 502 struct cypress_private *priv; 503 int ret; 504 505 ret = cypress_generic_port_probe(port); 506 if (ret) { 507 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 508 return ret; 509 } 510 511 priv = usb_get_serial_port_data(port); 512 priv->chiptype = CT_EARTHMATE; 513 /* All Earthmate devices use the separated-count packet 514 format! Idiotic. */ 515 priv->pkt_fmt = packet_format_1; 516 if (serial->dev->descriptor.idProduct != 517 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { 518 /* The old original USB Earthmate seemed able to 519 handle GET_CONFIG requests; everything they've 520 produced since that time crashes if this command is 521 attempted :-( */ 522 dev_dbg(&port->dev, 523 "%s - Marking this device as unsafe for GET_CONFIG commands\n", 524 __func__); 525 priv->get_cfg_unsafe = !0; 526 } 527 528 return 0; 529 } 530 531 static int cypress_hidcom_port_probe(struct usb_serial_port *port) 532 { 533 struct cypress_private *priv; 534 int ret; 535 536 ret = cypress_generic_port_probe(port); 537 if (ret) { 538 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 539 return ret; 540 } 541 542 priv = usb_get_serial_port_data(port); 543 priv->chiptype = CT_CYPHIDCOM; 544 545 return 0; 546 } 547 548 static int cypress_ca42v2_port_probe(struct usb_serial_port *port) 549 { 550 struct cypress_private *priv; 551 int ret; 552 553 ret = cypress_generic_port_probe(port); 554 if (ret) { 555 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 556 return ret; 557 } 558 559 priv = usb_get_serial_port_data(port); 560 priv->chiptype = CT_CA42V2; 561 562 return 0; 563 } 564 565 static int cypress_port_remove(struct usb_serial_port *port) 566 { 567 struct cypress_private *priv; 568 569 priv = usb_get_serial_port_data(port); 570 571 kfifo_free(&priv->write_fifo); 572 kfree(priv); 573 574 return 0; 575 } 576 577 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port) 578 { 579 struct cypress_private *priv = usb_get_serial_port_data(port); 580 struct usb_serial *serial = port->serial; 581 unsigned long flags; 582 int result = 0; 583 584 if (!priv->comm_is_ok) 585 return -EIO; 586 587 /* clear halts before open */ 588 usb_clear_halt(serial->dev, 0x81); 589 usb_clear_halt(serial->dev, 0x02); 590 591 spin_lock_irqsave(&priv->lock, flags); 592 /* reset read/write statistics */ 593 priv->bytes_in = 0; 594 priv->bytes_out = 0; 595 priv->cmd_count = 0; 596 priv->rx_flags = 0; 597 spin_unlock_irqrestore(&priv->lock, flags); 598 599 /* Set termios */ 600 cypress_send(port); 601 602 if (tty) 603 cypress_set_termios(tty, port, NULL); 604 605 /* setup the port and start reading from the device */ 606 usb_fill_int_urb(port->interrupt_in_urb, serial->dev, 607 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), 608 port->interrupt_in_urb->transfer_buffer, 609 port->interrupt_in_urb->transfer_buffer_length, 610 cypress_read_int_callback, port, priv->read_urb_interval); 611 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 612 613 if (result) { 614 dev_err(&port->dev, 615 "%s - failed submitting read urb, error %d\n", 616 __func__, result); 617 cypress_set_dead(port); 618 } 619 620 return result; 621 } /* cypress_open */ 622 623 static void cypress_dtr_rts(struct usb_serial_port *port, int on) 624 { 625 struct cypress_private *priv = usb_get_serial_port_data(port); 626 /* drop dtr and rts */ 627 spin_lock_irq(&priv->lock); 628 if (on == 0) 629 priv->line_control = 0; 630 else 631 priv->line_control = CONTROL_DTR | CONTROL_RTS; 632 priv->cmd_ctrl = 1; 633 spin_unlock_irq(&priv->lock); 634 cypress_write(NULL, port, NULL, 0); 635 } 636 637 static void cypress_close(struct usb_serial_port *port) 638 { 639 struct cypress_private *priv = usb_get_serial_port_data(port); 640 unsigned long flags; 641 642 spin_lock_irqsave(&priv->lock, flags); 643 kfifo_reset_out(&priv->write_fifo); 644 spin_unlock_irqrestore(&priv->lock, flags); 645 646 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__); 647 usb_kill_urb(port->interrupt_in_urb); 648 usb_kill_urb(port->interrupt_out_urb); 649 650 if (stats) 651 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n", 652 priv->bytes_in, priv->bytes_out, priv->cmd_count); 653 } /* cypress_close */ 654 655 656 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 657 const unsigned char *buf, int count) 658 { 659 struct cypress_private *priv = usb_get_serial_port_data(port); 660 661 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count); 662 663 /* line control commands, which need to be executed immediately, 664 are not put into the buffer for obvious reasons. 665 */ 666 if (priv->cmd_ctrl) { 667 count = 0; 668 goto finish; 669 } 670 671 if (!count) 672 return count; 673 674 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock); 675 676 finish: 677 cypress_send(port); 678 679 return count; 680 } /* cypress_write */ 681 682 683 static void cypress_send(struct usb_serial_port *port) 684 { 685 int count = 0, result, offset, actual_size; 686 struct cypress_private *priv = usb_get_serial_port_data(port); 687 struct device *dev = &port->dev; 688 unsigned long flags; 689 690 if (!priv->comm_is_ok) 691 return; 692 693 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__, 694 port->interrupt_out_size); 695 696 spin_lock_irqsave(&priv->lock, flags); 697 if (priv->write_urb_in_use) { 698 dev_dbg(dev, "%s - can't write, urb in use\n", __func__); 699 spin_unlock_irqrestore(&priv->lock, flags); 700 return; 701 } 702 spin_unlock_irqrestore(&priv->lock, flags); 703 704 /* clear buffer */ 705 memset(port->interrupt_out_urb->transfer_buffer, 0, 706 port->interrupt_out_size); 707 708 spin_lock_irqsave(&priv->lock, flags); 709 switch (priv->pkt_fmt) { 710 default: 711 case packet_format_1: 712 /* this is for the CY7C64013... */ 713 offset = 2; 714 port->interrupt_out_buffer[0] = priv->line_control; 715 break; 716 case packet_format_2: 717 /* this is for the CY7C63743... */ 718 offset = 1; 719 port->interrupt_out_buffer[0] = priv->line_control; 720 break; 721 } 722 723 if (priv->line_control & CONTROL_RESET) 724 priv->line_control &= ~CONTROL_RESET; 725 726 if (priv->cmd_ctrl) { 727 priv->cmd_count++; 728 dev_dbg(dev, "%s - line control command being issued\n", __func__); 729 spin_unlock_irqrestore(&priv->lock, flags); 730 goto send; 731 } else 732 spin_unlock_irqrestore(&priv->lock, flags); 733 734 count = kfifo_out_locked(&priv->write_fifo, 735 &port->interrupt_out_buffer[offset], 736 port->interrupt_out_size - offset, 737 &priv->lock); 738 if (count == 0) 739 return; 740 741 switch (priv->pkt_fmt) { 742 default: 743 case packet_format_1: 744 port->interrupt_out_buffer[1] = count; 745 break; 746 case packet_format_2: 747 port->interrupt_out_buffer[0] |= count; 748 } 749 750 dev_dbg(dev, "%s - count is %d\n", __func__, count); 751 752 send: 753 spin_lock_irqsave(&priv->lock, flags); 754 priv->write_urb_in_use = 1; 755 spin_unlock_irqrestore(&priv->lock, flags); 756 757 if (priv->cmd_ctrl) 758 actual_size = 1; 759 else 760 actual_size = count + 761 (priv->pkt_fmt == packet_format_1 ? 2 : 1); 762 763 usb_serial_debug_data(dev, __func__, port->interrupt_out_size, 764 port->interrupt_out_urb->transfer_buffer); 765 766 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev, 767 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress), 768 port->interrupt_out_buffer, actual_size, 769 cypress_write_int_callback, port, priv->write_urb_interval); 770 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); 771 if (result) { 772 dev_err_console(port, 773 "%s - failed submitting write urb, error %d\n", 774 __func__, result); 775 priv->write_urb_in_use = 0; 776 cypress_set_dead(port); 777 } 778 779 spin_lock_irqsave(&priv->lock, flags); 780 if (priv->cmd_ctrl) 781 priv->cmd_ctrl = 0; 782 783 /* do not count the line control and size bytes */ 784 priv->bytes_out += count; 785 spin_unlock_irqrestore(&priv->lock, flags); 786 787 usb_serial_port_softint(port); 788 } /* cypress_send */ 789 790 791 /* returns how much space is available in the soft buffer */ 792 static int cypress_write_room(struct tty_struct *tty) 793 { 794 struct usb_serial_port *port = tty->driver_data; 795 struct cypress_private *priv = usb_get_serial_port_data(port); 796 int room = 0; 797 unsigned long flags; 798 799 spin_lock_irqsave(&priv->lock, flags); 800 room = kfifo_avail(&priv->write_fifo); 801 spin_unlock_irqrestore(&priv->lock, flags); 802 803 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 804 return room; 805 } 806 807 808 static int cypress_tiocmget(struct tty_struct *tty) 809 { 810 struct usb_serial_port *port = tty->driver_data; 811 struct cypress_private *priv = usb_get_serial_port_data(port); 812 __u8 status, control; 813 unsigned int result = 0; 814 unsigned long flags; 815 816 spin_lock_irqsave(&priv->lock, flags); 817 control = priv->line_control; 818 status = priv->current_status; 819 spin_unlock_irqrestore(&priv->lock, flags); 820 821 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 822 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0) 823 | ((status & UART_CTS) ? TIOCM_CTS : 0) 824 | ((status & UART_DSR) ? TIOCM_DSR : 0) 825 | ((status & UART_RI) ? TIOCM_RI : 0) 826 | ((status & UART_CD) ? TIOCM_CD : 0); 827 828 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 829 830 return result; 831 } 832 833 834 static int cypress_tiocmset(struct tty_struct *tty, 835 unsigned int set, unsigned int clear) 836 { 837 struct usb_serial_port *port = tty->driver_data; 838 struct cypress_private *priv = usb_get_serial_port_data(port); 839 unsigned long flags; 840 841 spin_lock_irqsave(&priv->lock, flags); 842 if (set & TIOCM_RTS) 843 priv->line_control |= CONTROL_RTS; 844 if (set & TIOCM_DTR) 845 priv->line_control |= CONTROL_DTR; 846 if (clear & TIOCM_RTS) 847 priv->line_control &= ~CONTROL_RTS; 848 if (clear & TIOCM_DTR) 849 priv->line_control &= ~CONTROL_DTR; 850 priv->cmd_ctrl = 1; 851 spin_unlock_irqrestore(&priv->lock, flags); 852 853 return cypress_write(tty, port, NULL, 0); 854 } 855 856 static void cypress_earthmate_init_termios(struct tty_struct *tty) 857 { 858 tty_encode_baud_rate(tty, 4800, 4800); 859 } 860 861 static void cypress_set_termios(struct tty_struct *tty, 862 struct usb_serial_port *port, struct ktermios *old_termios) 863 { 864 struct cypress_private *priv = usb_get_serial_port_data(port); 865 struct device *dev = &port->dev; 866 int data_bits, stop_bits, parity_type, parity_enable; 867 unsigned int cflag; 868 unsigned long flags; 869 __u8 oldlines; 870 int linechange = 0; 871 872 /* Unsupported features need clearing */ 873 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS); 874 875 cflag = tty->termios.c_cflag; 876 877 /* set number of data bits, parity, stop bits */ 878 /* when parity is disabled the parity type bit is ignored */ 879 880 /* 1 means 2 stop bits, 0 means 1 stop bit */ 881 stop_bits = cflag & CSTOPB ? 1 : 0; 882 883 if (cflag & PARENB) { 884 parity_enable = 1; 885 /* 1 means odd parity, 0 means even parity */ 886 parity_type = cflag & PARODD ? 1 : 0; 887 } else 888 parity_enable = parity_type = 0; 889 890 switch (cflag & CSIZE) { 891 case CS5: 892 data_bits = 0; 893 break; 894 case CS6: 895 data_bits = 1; 896 break; 897 case CS7: 898 data_bits = 2; 899 break; 900 case CS8: 901 data_bits = 3; 902 break; 903 default: 904 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__); 905 data_bits = 3; 906 } 907 spin_lock_irqsave(&priv->lock, flags); 908 oldlines = priv->line_control; 909 if ((cflag & CBAUD) == B0) { 910 /* drop dtr and rts */ 911 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__); 912 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 913 } else 914 priv->line_control = (CONTROL_DTR | CONTROL_RTS); 915 spin_unlock_irqrestore(&priv->lock, flags); 916 917 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n", 918 __func__, stop_bits, parity_enable, parity_type, data_bits); 919 920 cypress_serial_control(tty, port, tty_get_baud_rate(tty), 921 data_bits, stop_bits, 922 parity_enable, parity_type, 923 0, CYPRESS_SET_CONFIG); 924 925 /* we perform a CYPRESS_GET_CONFIG so that the current settings are 926 * filled into the private structure this should confirm that all is 927 * working if it returns what we just set */ 928 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG); 929 930 /* Here we can define custom tty settings for devices; the main tty 931 * termios flag base comes from empeg.c */ 932 933 spin_lock_irqsave(&priv->lock, flags); 934 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) { 935 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n"); 936 /* define custom termios settings for NMEA protocol */ 937 938 tty->termios.c_iflag /* input modes - */ 939 &= ~(IGNBRK /* disable ignore break */ 940 | BRKINT /* disable break causes interrupt */ 941 | PARMRK /* disable mark parity errors */ 942 | ISTRIP /* disable clear high bit of input char */ 943 | INLCR /* disable translate NL to CR */ 944 | IGNCR /* disable ignore CR */ 945 | ICRNL /* disable translate CR to NL */ 946 | IXON); /* disable enable XON/XOFF flow control */ 947 948 tty->termios.c_oflag /* output modes */ 949 &= ~OPOST; /* disable postprocess output char */ 950 951 tty->termios.c_lflag /* line discipline modes */ 952 &= ~(ECHO /* disable echo input characters */ 953 | ECHONL /* disable echo new line */ 954 | ICANON /* disable erase, kill, werase, and rprnt 955 special characters */ 956 | ISIG /* disable interrupt, quit, and suspend 957 special characters */ 958 | IEXTEN); /* disable non-POSIX special characters */ 959 } /* CT_CYPHIDCOM: Application should handle this for device */ 960 961 linechange = (priv->line_control != oldlines); 962 spin_unlock_irqrestore(&priv->lock, flags); 963 964 /* if necessary, set lines */ 965 if (linechange) { 966 priv->cmd_ctrl = 1; 967 cypress_write(tty, port, NULL, 0); 968 } 969 } /* cypress_set_termios */ 970 971 972 /* returns amount of data still left in soft buffer */ 973 static int cypress_chars_in_buffer(struct tty_struct *tty) 974 { 975 struct usb_serial_port *port = tty->driver_data; 976 struct cypress_private *priv = usb_get_serial_port_data(port); 977 int chars = 0; 978 unsigned long flags; 979 980 spin_lock_irqsave(&priv->lock, flags); 981 chars = kfifo_len(&priv->write_fifo); 982 spin_unlock_irqrestore(&priv->lock, flags); 983 984 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 985 return chars; 986 } 987 988 989 static void cypress_throttle(struct tty_struct *tty) 990 { 991 struct usb_serial_port *port = tty->driver_data; 992 struct cypress_private *priv = usb_get_serial_port_data(port); 993 994 spin_lock_irq(&priv->lock); 995 priv->rx_flags = THROTTLED; 996 spin_unlock_irq(&priv->lock); 997 } 998 999 1000 static void cypress_unthrottle(struct tty_struct *tty) 1001 { 1002 struct usb_serial_port *port = tty->driver_data; 1003 struct cypress_private *priv = usb_get_serial_port_data(port); 1004 int actually_throttled, result; 1005 1006 spin_lock_irq(&priv->lock); 1007 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; 1008 priv->rx_flags = 0; 1009 spin_unlock_irq(&priv->lock); 1010 1011 if (!priv->comm_is_ok) 1012 return; 1013 1014 if (actually_throttled) { 1015 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1016 if (result) { 1017 dev_err(&port->dev, "%s - failed submitting read urb, " 1018 "error %d\n", __func__, result); 1019 cypress_set_dead(port); 1020 } 1021 } 1022 } 1023 1024 1025 static void cypress_read_int_callback(struct urb *urb) 1026 { 1027 struct usb_serial_port *port = urb->context; 1028 struct cypress_private *priv = usb_get_serial_port_data(port); 1029 struct device *dev = &urb->dev->dev; 1030 struct tty_struct *tty; 1031 unsigned char *data = urb->transfer_buffer; 1032 unsigned long flags; 1033 char tty_flag = TTY_NORMAL; 1034 int bytes = 0; 1035 int result; 1036 int i = 0; 1037 int status = urb->status; 1038 1039 switch (status) { 1040 case 0: /* success */ 1041 break; 1042 case -ECONNRESET: 1043 case -ENOENT: 1044 case -ESHUTDOWN: 1045 /* precursor to disconnect so just go away */ 1046 return; 1047 case -EPIPE: 1048 /* Can't call usb_clear_halt while in_interrupt */ 1049 /* FALLS THROUGH */ 1050 default: 1051 /* something ugly is going on... */ 1052 dev_err(dev, "%s - unexpected nonzero read status received: %d\n", 1053 __func__, status); 1054 cypress_set_dead(port); 1055 return; 1056 } 1057 1058 spin_lock_irqsave(&priv->lock, flags); 1059 if (priv->rx_flags & THROTTLED) { 1060 dev_dbg(dev, "%s - now throttling\n", __func__); 1061 priv->rx_flags |= ACTUALLY_THROTTLED; 1062 spin_unlock_irqrestore(&priv->lock, flags); 1063 return; 1064 } 1065 spin_unlock_irqrestore(&priv->lock, flags); 1066 1067 tty = tty_port_tty_get(&port->port); 1068 if (!tty) { 1069 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__); 1070 return; 1071 } 1072 1073 spin_lock_irqsave(&priv->lock, flags); 1074 result = urb->actual_length; 1075 switch (priv->pkt_fmt) { 1076 default: 1077 case packet_format_1: 1078 /* This is for the CY7C64013... */ 1079 priv->current_status = data[0] & 0xF8; 1080 bytes = data[1] + 2; 1081 i = 2; 1082 break; 1083 case packet_format_2: 1084 /* This is for the CY7C63743... */ 1085 priv->current_status = data[0] & 0xF8; 1086 bytes = (data[0] & 0x07) + 1; 1087 i = 1; 1088 break; 1089 } 1090 spin_unlock_irqrestore(&priv->lock, flags); 1091 if (result < bytes) { 1092 dev_dbg(dev, 1093 "%s - wrong packet size - received %d bytes but packet said %d bytes\n", 1094 __func__, result, bytes); 1095 goto continue_read; 1096 } 1097 1098 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 1099 1100 spin_lock_irqsave(&priv->lock, flags); 1101 /* check to see if status has changed */ 1102 if (priv->current_status != priv->prev_status) { 1103 u8 delta = priv->current_status ^ priv->prev_status; 1104 1105 if (delta & UART_MSR_MASK) { 1106 if (delta & UART_CTS) 1107 port->icount.cts++; 1108 if (delta & UART_DSR) 1109 port->icount.dsr++; 1110 if (delta & UART_RI) 1111 port->icount.rng++; 1112 if (delta & UART_CD) 1113 port->icount.dcd++; 1114 1115 wake_up_interruptible(&port->port.delta_msr_wait); 1116 } 1117 1118 priv->prev_status = priv->current_status; 1119 } 1120 spin_unlock_irqrestore(&priv->lock, flags); 1121 1122 /* hangup, as defined in acm.c... this might be a bad place for it 1123 * though */ 1124 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) { 1125 dev_dbg(dev, "%s - calling hangup\n", __func__); 1126 tty_hangup(tty); 1127 goto continue_read; 1128 } 1129 1130 /* There is one error bit... I'm assuming it is a parity error 1131 * indicator as the generic firmware will set this bit to 1 if a 1132 * parity error occurs. 1133 * I can not find reference to any other error events. */ 1134 spin_lock_irqsave(&priv->lock, flags); 1135 if (priv->current_status & CYP_ERROR) { 1136 spin_unlock_irqrestore(&priv->lock, flags); 1137 tty_flag = TTY_PARITY; 1138 dev_dbg(dev, "%s - Parity Error detected\n", __func__); 1139 } else 1140 spin_unlock_irqrestore(&priv->lock, flags); 1141 1142 /* process read if there is data other than line status */ 1143 if (bytes > i) { 1144 tty_insert_flip_string_fixed_flag(&port->port, data + i, 1145 tty_flag, bytes - i); 1146 tty_flip_buffer_push(&port->port); 1147 } 1148 1149 spin_lock_irqsave(&priv->lock, flags); 1150 /* control and status byte(s) are also counted */ 1151 priv->bytes_in += bytes; 1152 spin_unlock_irqrestore(&priv->lock, flags); 1153 1154 continue_read: 1155 tty_kref_put(tty); 1156 1157 /* Continue trying to always read */ 1158 1159 if (priv->comm_is_ok) { 1160 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, 1161 usb_rcvintpipe(port->serial->dev, 1162 port->interrupt_in_endpointAddress), 1163 port->interrupt_in_urb->transfer_buffer, 1164 port->interrupt_in_urb->transfer_buffer_length, 1165 cypress_read_int_callback, port, 1166 priv->read_urb_interval); 1167 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 1168 if (result && result != -EPERM) { 1169 dev_err(dev, "%s - failed resubmitting read urb, error %d\n", 1170 __func__, result); 1171 cypress_set_dead(port); 1172 } 1173 } 1174 } /* cypress_read_int_callback */ 1175 1176 1177 static void cypress_write_int_callback(struct urb *urb) 1178 { 1179 struct usb_serial_port *port = urb->context; 1180 struct cypress_private *priv = usb_get_serial_port_data(port); 1181 struct device *dev = &urb->dev->dev; 1182 int status = urb->status; 1183 1184 switch (status) { 1185 case 0: 1186 /* success */ 1187 break; 1188 case -ECONNRESET: 1189 case -ENOENT: 1190 case -ESHUTDOWN: 1191 /* this urb is terminated, clean up */ 1192 dev_dbg(dev, "%s - urb shutting down with status: %d\n", 1193 __func__, status); 1194 priv->write_urb_in_use = 0; 1195 return; 1196 case -EPIPE: 1197 /* Cannot call usb_clear_halt while in_interrupt */ 1198 /* FALLTHROUGH */ 1199 default: 1200 dev_err(dev, "%s - unexpected nonzero write status received: %d\n", 1201 __func__, status); 1202 cypress_set_dead(port); 1203 break; 1204 } 1205 priv->write_urb_in_use = 0; 1206 1207 /* send any buffered data */ 1208 cypress_send(port); 1209 } 1210 1211 module_usb_serial_driver(serial_drivers, id_table_combined); 1212 1213 MODULE_AUTHOR(DRIVER_AUTHOR); 1214 MODULE_DESCRIPTION(DRIVER_DESC); 1215 MODULE_LICENSE("GPL"); 1216 1217 module_param(stats, bool, S_IRUGO | S_IWUSR); 1218 MODULE_PARM_DESC(stats, "Enable statistics or not"); 1219 module_param(interval, int, S_IRUGO | S_IWUSR); 1220 MODULE_PARM_DESC(interval, "Overrides interrupt interval"); 1221 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR); 1222 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates"); 1223