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_SAI, PRODUCT_ID_CYPHIDCOM) }, 63 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 64 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 65 { } /* Terminating entry */ 66 }; 67 68 static const struct usb_device_id id_table_nokiaca42v2[] = { 69 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 70 { } /* Terminating entry */ 71 }; 72 73 static const struct usb_device_id id_table_combined[] = { 74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 75 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 76 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 77 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) }, 78 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 79 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 80 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 81 { } /* Terminating entry */ 82 }; 83 84 MODULE_DEVICE_TABLE(usb, id_table_combined); 85 86 enum packet_format { 87 packet_format_1, /* b0:status, b1:payload count */ 88 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ 89 }; 90 91 struct cypress_private { 92 spinlock_t lock; /* private lock */ 93 int chiptype; /* identifier of device, for quirks/etc */ 94 int bytes_in; /* used for statistics */ 95 int bytes_out; /* used for statistics */ 96 int cmd_count; /* used for statistics */ 97 int cmd_ctrl; /* always set this to 1 before issuing a command */ 98 struct kfifo write_fifo; /* write fifo */ 99 int write_urb_in_use; /* write urb in use indicator */ 100 int write_urb_interval; /* interval to use for write urb */ 101 int read_urb_interval; /* interval to use for read urb */ 102 int comm_is_ok; /* true if communication is (still) ok */ 103 __u8 line_control; /* holds dtr / rts value */ 104 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ 105 __u8 current_config; /* stores the current configuration byte */ 106 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ 107 enum packet_format pkt_fmt; /* format to use for packet send / receive */ 108 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ 109 int baud_rate; /* stores current baud rate in 110 integer form */ 111 char prev_status; /* used for TIOCMIWAIT */ 112 }; 113 114 /* function prototypes for the Cypress USB to serial device */ 115 static int cypress_earthmate_port_probe(struct usb_serial_port *port); 116 static int cypress_hidcom_port_probe(struct usb_serial_port *port); 117 static int cypress_ca42v2_port_probe(struct usb_serial_port *port); 118 static void cypress_port_remove(struct usb_serial_port *port); 119 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); 120 static void cypress_close(struct usb_serial_port *port); 121 static void cypress_dtr_rts(struct usb_serial_port *port, int on); 122 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 123 const unsigned char *buf, int count); 124 static void cypress_send(struct usb_serial_port *port); 125 static unsigned int cypress_write_room(struct tty_struct *tty); 126 static void cypress_earthmate_init_termios(struct tty_struct *tty); 127 static void cypress_set_termios(struct tty_struct *tty, 128 struct usb_serial_port *port, struct ktermios *old); 129 static int cypress_tiocmget(struct tty_struct *tty); 130 static int cypress_tiocmset(struct tty_struct *tty, 131 unsigned int set, unsigned int clear); 132 static unsigned int cypress_chars_in_buffer(struct tty_struct *tty); 133 static void cypress_throttle(struct tty_struct *tty); 134 static void cypress_unthrottle(struct tty_struct *tty); 135 static void cypress_set_dead(struct usb_serial_port *port); 136 static void cypress_read_int_callback(struct urb *urb); 137 static void cypress_write_int_callback(struct urb *urb); 138 139 static struct usb_serial_driver cypress_earthmate_device = { 140 .driver = { 141 .owner = THIS_MODULE, 142 .name = "earthmate", 143 }, 144 .description = "DeLorme Earthmate USB", 145 .id_table = id_table_earthmate, 146 .num_ports = 1, 147 .port_probe = cypress_earthmate_port_probe, 148 .port_remove = cypress_port_remove, 149 .open = cypress_open, 150 .close = cypress_close, 151 .dtr_rts = cypress_dtr_rts, 152 .write = cypress_write, 153 .write_room = cypress_write_room, 154 .init_termios = cypress_earthmate_init_termios, 155 .set_termios = cypress_set_termios, 156 .tiocmget = cypress_tiocmget, 157 .tiocmset = cypress_tiocmset, 158 .tiocmiwait = usb_serial_generic_tiocmiwait, 159 .chars_in_buffer = cypress_chars_in_buffer, 160 .throttle = cypress_throttle, 161 .unthrottle = cypress_unthrottle, 162 .read_int_callback = cypress_read_int_callback, 163 .write_int_callback = cypress_write_int_callback, 164 }; 165 166 static struct usb_serial_driver cypress_hidcom_device = { 167 .driver = { 168 .owner = THIS_MODULE, 169 .name = "cyphidcom", 170 }, 171 .description = "HID->COM RS232 Adapter", 172 .id_table = id_table_cyphidcomrs232, 173 .num_ports = 1, 174 .port_probe = cypress_hidcom_port_probe, 175 .port_remove = cypress_port_remove, 176 .open = cypress_open, 177 .close = cypress_close, 178 .dtr_rts = cypress_dtr_rts, 179 .write = cypress_write, 180 .write_room = cypress_write_room, 181 .set_termios = cypress_set_termios, 182 .tiocmget = cypress_tiocmget, 183 .tiocmset = cypress_tiocmset, 184 .tiocmiwait = usb_serial_generic_tiocmiwait, 185 .chars_in_buffer = cypress_chars_in_buffer, 186 .throttle = cypress_throttle, 187 .unthrottle = cypress_unthrottle, 188 .read_int_callback = cypress_read_int_callback, 189 .write_int_callback = cypress_write_int_callback, 190 }; 191 192 static struct usb_serial_driver cypress_ca42v2_device = { 193 .driver = { 194 .owner = THIS_MODULE, 195 .name = "nokiaca42v2", 196 }, 197 .description = "Nokia CA-42 V2 Adapter", 198 .id_table = id_table_nokiaca42v2, 199 .num_ports = 1, 200 .port_probe = cypress_ca42v2_port_probe, 201 .port_remove = cypress_port_remove, 202 .open = cypress_open, 203 .close = cypress_close, 204 .dtr_rts = cypress_dtr_rts, 205 .write = cypress_write, 206 .write_room = cypress_write_room, 207 .set_termios = cypress_set_termios, 208 .tiocmget = cypress_tiocmget, 209 .tiocmset = cypress_tiocmset, 210 .tiocmiwait = usb_serial_generic_tiocmiwait, 211 .chars_in_buffer = cypress_chars_in_buffer, 212 .throttle = cypress_throttle, 213 .unthrottle = cypress_unthrottle, 214 .read_int_callback = cypress_read_int_callback, 215 .write_int_callback = cypress_write_int_callback, 216 }; 217 218 static struct usb_serial_driver * const serial_drivers[] = { 219 &cypress_earthmate_device, &cypress_hidcom_device, 220 &cypress_ca42v2_device, NULL 221 }; 222 223 /***************************************************************************** 224 * Cypress serial helper functions 225 *****************************************************************************/ 226 227 /* FRWD Dongle hidcom needs to skip reset and speed checks */ 228 static inline bool is_frwd(struct usb_device *dev) 229 { 230 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) && 231 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD)); 232 } 233 234 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) 235 { 236 struct cypress_private *priv; 237 priv = usb_get_serial_port_data(port); 238 239 if (unstable_bauds) 240 return new_rate; 241 242 /* FRWD Dongle uses 115200 bps */ 243 if (is_frwd(port->serial->dev)) 244 return new_rate; 245 246 /* 247 * The general purpose firmware for the Cypress M8 allows for 248 * a maximum speed of 57600bps (I have no idea whether DeLorme 249 * chose to use the general purpose firmware or not), if you 250 * need to modify this speed setting for your own project 251 * please add your own chiptype and modify the code likewise. 252 * The Cypress HID->COM device will work successfully up to 253 * 115200bps (but the actual throughput is around 3kBps). 254 */ 255 if (port->serial->dev->speed == USB_SPEED_LOW) { 256 /* 257 * Mike Isely <isely@pobox.com> 2-Feb-2008: The 258 * Cypress app note that describes this mechanism 259 * states the the low-speed part can't handle more 260 * than 800 bytes/sec, in which case 4800 baud is the 261 * safest speed for a part like that. 262 */ 263 if (new_rate > 4800) { 264 dev_dbg(&port->dev, 265 "%s - failed setting baud rate, device incapable speed %d\n", 266 __func__, new_rate); 267 return -1; 268 } 269 } 270 switch (priv->chiptype) { 271 case CT_EARTHMATE: 272 if (new_rate <= 600) { 273 /* 300 and 600 baud rates are supported under 274 * the generic firmware, but are not used with 275 * NMEA and SiRF protocols */ 276 dev_dbg(&port->dev, 277 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n", 278 __func__, new_rate); 279 return -1; 280 } 281 break; 282 default: 283 break; 284 } 285 return new_rate; 286 } 287 288 289 /* This function can either set or retrieve the current serial line settings */ 290 static int cypress_serial_control(struct tty_struct *tty, 291 struct usb_serial_port *port, speed_t baud_rate, int data_bits, 292 int stop_bits, int parity_enable, int parity_type, int reset, 293 int cypress_request_type) 294 { 295 int new_baudrate = 0, retval = 0, tries = 0; 296 struct cypress_private *priv; 297 struct device *dev = &port->dev; 298 u8 *feature_buffer; 299 const unsigned int feature_len = 5; 300 unsigned long flags; 301 302 priv = usb_get_serial_port_data(port); 303 304 if (!priv->comm_is_ok) 305 return -ENODEV; 306 307 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL); 308 if (!feature_buffer) 309 return -ENOMEM; 310 311 switch (cypress_request_type) { 312 case CYPRESS_SET_CONFIG: 313 /* 0 means 'Hang up' so doesn't change the true bit rate */ 314 new_baudrate = priv->baud_rate; 315 if (baud_rate && baud_rate != priv->baud_rate) { 316 dev_dbg(dev, "%s - baud rate is changing\n", __func__); 317 retval = analyze_baud_rate(port, baud_rate); 318 if (retval >= 0) { 319 new_baudrate = retval; 320 dev_dbg(dev, "%s - New baud rate set to %d\n", 321 __func__, new_baudrate); 322 } 323 } 324 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__, 325 new_baudrate); 326 327 /* fill the feature_buffer with new configuration */ 328 put_unaligned_le32(new_baudrate, feature_buffer); 329 feature_buffer[4] |= data_bits - 5; /* assign data bits in 2 bit space ( max 3 ) */ 330 /* 1 bit gap */ 331 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */ 332 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */ 333 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */ 334 /* 1 bit gap */ 335 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ 336 337 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__); 338 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__, 339 feature_buffer[0], feature_buffer[1], 340 feature_buffer[2], feature_buffer[3], 341 feature_buffer[4]); 342 343 do { 344 retval = usb_control_msg(port->serial->dev, 345 usb_sndctrlpipe(port->serial->dev, 0), 346 HID_REQ_SET_REPORT, 347 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 348 0x0300, 0, feature_buffer, 349 feature_len, 500); 350 351 if (tries++ >= 3) 352 break; 353 354 } while (retval != feature_len && 355 retval != -ENODEV); 356 357 if (retval != feature_len) { 358 dev_err(dev, "%s - failed sending serial line settings - %d\n", 359 __func__, retval); 360 cypress_set_dead(port); 361 } else { 362 spin_lock_irqsave(&priv->lock, flags); 363 priv->baud_rate = new_baudrate; 364 priv->current_config = feature_buffer[4]; 365 spin_unlock_irqrestore(&priv->lock, flags); 366 /* If we asked for a speed change encode it */ 367 if (baud_rate) 368 tty_encode_baud_rate(tty, 369 new_baudrate, new_baudrate); 370 } 371 break; 372 case CYPRESS_GET_CONFIG: 373 if (priv->get_cfg_unsafe) { 374 /* Not implemented for this device, 375 and if we try to do it we're likely 376 to crash the hardware. */ 377 retval = -ENOTTY; 378 goto out; 379 } 380 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__); 381 do { 382 retval = usb_control_msg(port->serial->dev, 383 usb_rcvctrlpipe(port->serial->dev, 0), 384 HID_REQ_GET_REPORT, 385 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 386 0x0300, 0, feature_buffer, 387 feature_len, 500); 388 389 if (tries++ >= 3) 390 break; 391 } while (retval != feature_len 392 && retval != -ENODEV); 393 394 if (retval != feature_len) { 395 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n", 396 __func__, retval); 397 cypress_set_dead(port); 398 goto out; 399 } else { 400 spin_lock_irqsave(&priv->lock, flags); 401 /* store the config in one byte, and later 402 use bit masks to check values */ 403 priv->current_config = feature_buffer[4]; 404 priv->baud_rate = get_unaligned_le32(feature_buffer); 405 spin_unlock_irqrestore(&priv->lock, flags); 406 } 407 } 408 spin_lock_irqsave(&priv->lock, flags); 409 ++priv->cmd_count; 410 spin_unlock_irqrestore(&priv->lock, flags); 411 out: 412 kfree(feature_buffer); 413 return retval; 414 } /* cypress_serial_control */ 415 416 417 static void cypress_set_dead(struct usb_serial_port *port) 418 { 419 struct cypress_private *priv = usb_get_serial_port_data(port); 420 unsigned long flags; 421 422 spin_lock_irqsave(&priv->lock, flags); 423 if (!priv->comm_is_ok) { 424 spin_unlock_irqrestore(&priv->lock, flags); 425 return; 426 } 427 priv->comm_is_ok = 0; 428 spin_unlock_irqrestore(&priv->lock, flags); 429 430 dev_err(&port->dev, "cypress_m8 suspending failing port %d - " 431 "interval might be too short\n", port->port_number); 432 } 433 434 435 /***************************************************************************** 436 * Cypress serial driver functions 437 *****************************************************************************/ 438 439 440 static int cypress_generic_port_probe(struct usb_serial_port *port) 441 { 442 struct usb_serial *serial = port->serial; 443 struct cypress_private *priv; 444 445 if (!port->interrupt_out_urb || !port->interrupt_in_urb) { 446 dev_err(&port->dev, "required endpoint is missing\n"); 447 return -ENODEV; 448 } 449 450 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL); 451 if (!priv) 452 return -ENOMEM; 453 454 priv->comm_is_ok = !0; 455 spin_lock_init(&priv->lock); 456 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { 457 kfree(priv); 458 return -ENOMEM; 459 } 460 461 /* Skip reset for FRWD device. It is a workaound: 462 device hangs if it receives SET_CONFIGURE in Configured 463 state. */ 464 if (!is_frwd(serial->dev)) 465 usb_reset_configuration(serial->dev); 466 467 priv->cmd_ctrl = 0; 468 priv->line_control = 0; 469 priv->rx_flags = 0; 470 /* Default packet format setting is determined by packet size. 471 Anything with a size larger then 9 must have a separate 472 count field since the 3 bit count field is otherwise too 473 small. Otherwise we can use the slightly more compact 474 format. This is in accordance with the cypress_m8 serial 475 converter app note. */ 476 if (port->interrupt_out_size > 9) 477 priv->pkt_fmt = packet_format_1; 478 else 479 priv->pkt_fmt = packet_format_2; 480 481 if (interval > 0) { 482 priv->write_urb_interval = interval; 483 priv->read_urb_interval = interval; 484 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n", 485 __func__, interval); 486 } else { 487 priv->write_urb_interval = port->interrupt_out_urb->interval; 488 priv->read_urb_interval = port->interrupt_in_urb->interval; 489 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n", 490 __func__, priv->read_urb_interval, 491 priv->write_urb_interval); 492 } 493 usb_set_serial_port_data(port, priv); 494 495 port->port.drain_delay = 256; 496 497 return 0; 498 } 499 500 501 static int cypress_earthmate_port_probe(struct usb_serial_port *port) 502 { 503 struct usb_serial *serial = port->serial; 504 struct cypress_private *priv; 505 int ret; 506 507 ret = cypress_generic_port_probe(port); 508 if (ret) { 509 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 510 return ret; 511 } 512 513 priv = usb_get_serial_port_data(port); 514 priv->chiptype = CT_EARTHMATE; 515 /* All Earthmate devices use the separated-count packet 516 format! Idiotic. */ 517 priv->pkt_fmt = packet_format_1; 518 if (serial->dev->descriptor.idProduct != 519 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { 520 /* The old original USB Earthmate seemed able to 521 handle GET_CONFIG requests; everything they've 522 produced since that time crashes if this command is 523 attempted :-( */ 524 dev_dbg(&port->dev, 525 "%s - Marking this device as unsafe for GET_CONFIG commands\n", 526 __func__); 527 priv->get_cfg_unsafe = !0; 528 } 529 530 return 0; 531 } 532 533 static int cypress_hidcom_port_probe(struct usb_serial_port *port) 534 { 535 struct cypress_private *priv; 536 int ret; 537 538 ret = cypress_generic_port_probe(port); 539 if (ret) { 540 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 541 return ret; 542 } 543 544 priv = usb_get_serial_port_data(port); 545 priv->chiptype = CT_CYPHIDCOM; 546 547 return 0; 548 } 549 550 static int cypress_ca42v2_port_probe(struct usb_serial_port *port) 551 { 552 struct cypress_private *priv; 553 int ret; 554 555 ret = cypress_generic_port_probe(port); 556 if (ret) { 557 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 558 return ret; 559 } 560 561 priv = usb_get_serial_port_data(port); 562 priv->chiptype = CT_CA42V2; 563 564 return 0; 565 } 566 567 static void cypress_port_remove(struct usb_serial_port *port) 568 { 569 struct cypress_private *priv; 570 571 priv = usb_get_serial_port_data(port); 572 573 kfifo_free(&priv->write_fifo); 574 kfree(priv); 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 unsigned 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 unsigned int room; 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 %u\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 data_bits = tty_get_char_size(cflag); 891 892 spin_lock_irqsave(&priv->lock, flags); 893 oldlines = priv->line_control; 894 if ((cflag & CBAUD) == B0) { 895 /* drop dtr and rts */ 896 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__); 897 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 898 } else 899 priv->line_control = (CONTROL_DTR | CONTROL_RTS); 900 spin_unlock_irqrestore(&priv->lock, flags); 901 902 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n", 903 __func__, stop_bits, parity_enable, parity_type, data_bits); 904 905 cypress_serial_control(tty, port, tty_get_baud_rate(tty), 906 data_bits, stop_bits, 907 parity_enable, parity_type, 908 0, CYPRESS_SET_CONFIG); 909 910 /* we perform a CYPRESS_GET_CONFIG so that the current settings are 911 * filled into the private structure this should confirm that all is 912 * working if it returns what we just set */ 913 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG); 914 915 /* Here we can define custom tty settings for devices; the main tty 916 * termios flag base comes from empeg.c */ 917 918 spin_lock_irqsave(&priv->lock, flags); 919 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) { 920 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n"); 921 /* define custom termios settings for NMEA protocol */ 922 923 tty->termios.c_iflag /* input modes - */ 924 &= ~(IGNBRK /* disable ignore break */ 925 | BRKINT /* disable break causes interrupt */ 926 | PARMRK /* disable mark parity errors */ 927 | ISTRIP /* disable clear high bit of input char */ 928 | INLCR /* disable translate NL to CR */ 929 | IGNCR /* disable ignore CR */ 930 | ICRNL /* disable translate CR to NL */ 931 | IXON); /* disable enable XON/XOFF flow control */ 932 933 tty->termios.c_oflag /* output modes */ 934 &= ~OPOST; /* disable postprocess output char */ 935 936 tty->termios.c_lflag /* line discipline modes */ 937 &= ~(ECHO /* disable echo input characters */ 938 | ECHONL /* disable echo new line */ 939 | ICANON /* disable erase, kill, werase, and rprnt 940 special characters */ 941 | ISIG /* disable interrupt, quit, and suspend 942 special characters */ 943 | IEXTEN); /* disable non-POSIX special characters */ 944 } /* CT_CYPHIDCOM: Application should handle this for device */ 945 946 linechange = (priv->line_control != oldlines); 947 spin_unlock_irqrestore(&priv->lock, flags); 948 949 /* if necessary, set lines */ 950 if (linechange) { 951 priv->cmd_ctrl = 1; 952 cypress_write(tty, port, NULL, 0); 953 } 954 } /* cypress_set_termios */ 955 956 957 /* returns amount of data still left in soft buffer */ 958 static unsigned int cypress_chars_in_buffer(struct tty_struct *tty) 959 { 960 struct usb_serial_port *port = tty->driver_data; 961 struct cypress_private *priv = usb_get_serial_port_data(port); 962 unsigned int chars; 963 unsigned long flags; 964 965 spin_lock_irqsave(&priv->lock, flags); 966 chars = kfifo_len(&priv->write_fifo); 967 spin_unlock_irqrestore(&priv->lock, flags); 968 969 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars); 970 return chars; 971 } 972 973 974 static void cypress_throttle(struct tty_struct *tty) 975 { 976 struct usb_serial_port *port = tty->driver_data; 977 struct cypress_private *priv = usb_get_serial_port_data(port); 978 979 spin_lock_irq(&priv->lock); 980 priv->rx_flags = THROTTLED; 981 spin_unlock_irq(&priv->lock); 982 } 983 984 985 static void cypress_unthrottle(struct tty_struct *tty) 986 { 987 struct usb_serial_port *port = tty->driver_data; 988 struct cypress_private *priv = usb_get_serial_port_data(port); 989 int actually_throttled, result; 990 991 spin_lock_irq(&priv->lock); 992 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; 993 priv->rx_flags = 0; 994 spin_unlock_irq(&priv->lock); 995 996 if (!priv->comm_is_ok) 997 return; 998 999 if (actually_throttled) { 1000 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1001 if (result) { 1002 dev_err(&port->dev, "%s - failed submitting read urb, " 1003 "error %d\n", __func__, result); 1004 cypress_set_dead(port); 1005 } 1006 } 1007 } 1008 1009 1010 static void cypress_read_int_callback(struct urb *urb) 1011 { 1012 struct usb_serial_port *port = urb->context; 1013 struct cypress_private *priv = usb_get_serial_port_data(port); 1014 struct device *dev = &urb->dev->dev; 1015 struct tty_struct *tty; 1016 unsigned char *data = urb->transfer_buffer; 1017 unsigned long flags; 1018 char tty_flag = TTY_NORMAL; 1019 int bytes = 0; 1020 int result; 1021 int i = 0; 1022 int status = urb->status; 1023 1024 switch (status) { 1025 case 0: /* success */ 1026 break; 1027 case -ECONNRESET: 1028 case -ENOENT: 1029 case -ESHUTDOWN: 1030 /* precursor to disconnect so just go away */ 1031 return; 1032 case -EPIPE: 1033 /* Can't call usb_clear_halt while in_interrupt */ 1034 fallthrough; 1035 default: 1036 /* something ugly is going on... */ 1037 dev_err(dev, "%s - unexpected nonzero read status received: %d\n", 1038 __func__, status); 1039 cypress_set_dead(port); 1040 return; 1041 } 1042 1043 spin_lock_irqsave(&priv->lock, flags); 1044 if (priv->rx_flags & THROTTLED) { 1045 dev_dbg(dev, "%s - now throttling\n", __func__); 1046 priv->rx_flags |= ACTUALLY_THROTTLED; 1047 spin_unlock_irqrestore(&priv->lock, flags); 1048 return; 1049 } 1050 spin_unlock_irqrestore(&priv->lock, flags); 1051 1052 tty = tty_port_tty_get(&port->port); 1053 if (!tty) { 1054 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__); 1055 return; 1056 } 1057 1058 spin_lock_irqsave(&priv->lock, flags); 1059 result = urb->actual_length; 1060 switch (priv->pkt_fmt) { 1061 default: 1062 case packet_format_1: 1063 /* This is for the CY7C64013... */ 1064 priv->current_status = data[0] & 0xF8; 1065 bytes = data[1] + 2; 1066 i = 2; 1067 break; 1068 case packet_format_2: 1069 /* This is for the CY7C63743... */ 1070 priv->current_status = data[0] & 0xF8; 1071 bytes = (data[0] & 0x07) + 1; 1072 i = 1; 1073 break; 1074 } 1075 spin_unlock_irqrestore(&priv->lock, flags); 1076 if (result < bytes) { 1077 dev_dbg(dev, 1078 "%s - wrong packet size - received %d bytes but packet said %d bytes\n", 1079 __func__, result, bytes); 1080 goto continue_read; 1081 } 1082 1083 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 1084 1085 spin_lock_irqsave(&priv->lock, flags); 1086 /* check to see if status has changed */ 1087 if (priv->current_status != priv->prev_status) { 1088 u8 delta = priv->current_status ^ priv->prev_status; 1089 1090 if (delta & UART_MSR_MASK) { 1091 if (delta & UART_CTS) 1092 port->icount.cts++; 1093 if (delta & UART_DSR) 1094 port->icount.dsr++; 1095 if (delta & UART_RI) 1096 port->icount.rng++; 1097 if (delta & UART_CD) 1098 port->icount.dcd++; 1099 1100 wake_up_interruptible(&port->port.delta_msr_wait); 1101 } 1102 1103 priv->prev_status = priv->current_status; 1104 } 1105 spin_unlock_irqrestore(&priv->lock, flags); 1106 1107 /* hangup, as defined in acm.c... this might be a bad place for it 1108 * though */ 1109 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) { 1110 dev_dbg(dev, "%s - calling hangup\n", __func__); 1111 tty_hangup(tty); 1112 goto continue_read; 1113 } 1114 1115 /* There is one error bit... I'm assuming it is a parity error 1116 * indicator as the generic firmware will set this bit to 1 if a 1117 * parity error occurs. 1118 * I can not find reference to any other error events. */ 1119 spin_lock_irqsave(&priv->lock, flags); 1120 if (priv->current_status & CYP_ERROR) { 1121 spin_unlock_irqrestore(&priv->lock, flags); 1122 tty_flag = TTY_PARITY; 1123 dev_dbg(dev, "%s - Parity Error detected\n", __func__); 1124 } else 1125 spin_unlock_irqrestore(&priv->lock, flags); 1126 1127 /* process read if there is data other than line status */ 1128 if (bytes > i) { 1129 tty_insert_flip_string_fixed_flag(&port->port, data + i, 1130 tty_flag, bytes - i); 1131 tty_flip_buffer_push(&port->port); 1132 } 1133 1134 spin_lock_irqsave(&priv->lock, flags); 1135 /* control and status byte(s) are also counted */ 1136 priv->bytes_in += bytes; 1137 spin_unlock_irqrestore(&priv->lock, flags); 1138 1139 continue_read: 1140 tty_kref_put(tty); 1141 1142 /* Continue trying to always read */ 1143 1144 if (priv->comm_is_ok) { 1145 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, 1146 usb_rcvintpipe(port->serial->dev, 1147 port->interrupt_in_endpointAddress), 1148 port->interrupt_in_urb->transfer_buffer, 1149 port->interrupt_in_urb->transfer_buffer_length, 1150 cypress_read_int_callback, port, 1151 priv->read_urb_interval); 1152 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 1153 if (result && result != -EPERM) { 1154 dev_err(dev, "%s - failed resubmitting read urb, error %d\n", 1155 __func__, result); 1156 cypress_set_dead(port); 1157 } 1158 } 1159 } /* cypress_read_int_callback */ 1160 1161 1162 static void cypress_write_int_callback(struct urb *urb) 1163 { 1164 struct usb_serial_port *port = urb->context; 1165 struct cypress_private *priv = usb_get_serial_port_data(port); 1166 struct device *dev = &urb->dev->dev; 1167 int status = urb->status; 1168 1169 switch (status) { 1170 case 0: 1171 /* success */ 1172 break; 1173 case -ECONNRESET: 1174 case -ENOENT: 1175 case -ESHUTDOWN: 1176 /* this urb is terminated, clean up */ 1177 dev_dbg(dev, "%s - urb shutting down with status: %d\n", 1178 __func__, status); 1179 priv->write_urb_in_use = 0; 1180 return; 1181 case -EPIPE: 1182 /* Cannot call usb_clear_halt while in_interrupt */ 1183 fallthrough; 1184 default: 1185 dev_err(dev, "%s - unexpected nonzero write status received: %d\n", 1186 __func__, status); 1187 cypress_set_dead(port); 1188 break; 1189 } 1190 priv->write_urb_in_use = 0; 1191 1192 /* send any buffered data */ 1193 cypress_send(port); 1194 } 1195 1196 module_usb_serial_driver(serial_drivers, id_table_combined); 1197 1198 MODULE_AUTHOR(DRIVER_AUTHOR); 1199 MODULE_DESCRIPTION(DRIVER_DESC); 1200 MODULE_LICENSE("GPL"); 1201 1202 module_param(stats, bool, 0644); 1203 MODULE_PARM_DESC(stats, "Enable statistics or not"); 1204 module_param(interval, int, 0644); 1205 MODULE_PARM_DESC(interval, "Overrides interrupt interval"); 1206 module_param(unstable_bauds, bool, 0644); 1207 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates"); 1208