1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial convertor 4 * 5 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, version 2 of the License. 10 * 11 * Developed by: 12 * Vijaya Kumar <vijaykumar.gn@gmail.com> 13 * Ajay Kumar <naanuajay@yahoo.com> 14 * Gurudeva <ngurudeva@yahoo.com> 15 * 16 * Cleaned up from the original by: 17 * Greg Kroah-Hartman <gregkh@suse.de> 18 * 19 * Originally based on drivers/usb/serial/io_edgeport.c which is: 20 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 22 */ 23 #include <linux/kernel.h> 24 #include <linux/errno.h> 25 #include <linux/init.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/spinlock.h> 32 #include <linux/serial.h> 33 #include <linux/serial_reg.h> 34 #include <linux/usb.h> 35 #include <linux/usb/serial.h> 36 #include <linux/uaccess.h> 37 #include <linux/parport.h> 38 39 /* 40 * Version Information 41 */ 42 #define DRIVER_VERSION "2.1" 43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 44 #define DRIVER_DESC "Moschip USB Serial Driver" 45 46 /* default urb timeout */ 47 #define MOS_WDR_TIMEOUT (HZ * 5) 48 49 #define MOS_MAX_PORT 0x02 50 #define MOS_WRITE 0x0E 51 #define MOS_READ 0x0D 52 53 /* Interrupt Rotinue Defines */ 54 #define SERIAL_IIR_RLS 0x06 55 #define SERIAL_IIR_RDA 0x04 56 #define SERIAL_IIR_CTI 0x0c 57 #define SERIAL_IIR_THR 0x02 58 #define SERIAL_IIR_MS 0x00 59 60 #define NUM_URBS 16 /* URB Count */ 61 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 62 63 /* This structure holds all of the local serial port information */ 64 struct moschip_port { 65 __u8 shadowLCR; /* last LCR value received */ 66 __u8 shadowMCR; /* last MCR value received */ 67 __u8 shadowMSR; /* last MSR value received */ 68 char open; 69 struct async_icount icount; 70 struct usb_serial_port *port; /* loop back to the owner */ 71 struct urb *write_urb_pool[NUM_URBS]; 72 }; 73 74 static bool debug; 75 76 static struct usb_serial_driver moschip7720_2port_driver; 77 78 #define USB_VENDOR_ID_MOSCHIP 0x9710 79 #define MOSCHIP_DEVICE_ID_7720 0x7720 80 #define MOSCHIP_DEVICE_ID_7715 0x7715 81 82 static const struct usb_device_id id_table[] = { 83 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 84 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 85 { } /* terminating entry */ 86 }; 87 MODULE_DEVICE_TABLE(usb, id_table); 88 89 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 90 91 /* initial values for parport regs */ 92 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 93 #define ECR_INIT_VAL 0x00 /* SPP mode */ 94 95 struct urbtracker { 96 struct mos7715_parport *mos_parport; 97 struct list_head urblist_entry; 98 struct kref ref_count; 99 struct urb *urb; 100 }; 101 102 enum mos7715_pp_modes { 103 SPP = 0<<5, 104 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 105 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 106 }; 107 108 struct mos7715_parport { 109 struct parport *pp; /* back to containing struct */ 110 struct kref ref_count; /* to instance of this struct */ 111 struct list_head deferred_urbs; /* list deferred async urbs */ 112 struct list_head active_urbs; /* list async urbs in flight */ 113 spinlock_t listlock; /* protects list access */ 114 bool msg_pending; /* usb sync call pending */ 115 struct completion syncmsg_compl; /* usb sync call completed */ 116 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 117 struct usb_serial *serial; /* back to containing struct */ 118 __u8 shadowECR; /* parallel port regs... */ 119 __u8 shadowDCR; 120 atomic_t shadowDSR; /* updated in int-in callback */ 121 }; 122 123 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 124 static DEFINE_SPINLOCK(release_lock); 125 126 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 127 128 static const unsigned int dummy; /* for clarity in register access fns */ 129 130 enum mos_regs { 131 THR, /* serial port regs */ 132 RHR, 133 IER, 134 FCR, 135 ISR, 136 LCR, 137 MCR, 138 LSR, 139 MSR, 140 SPR, 141 DLL, 142 DLM, 143 DPR, /* parallel port regs */ 144 DSR, 145 DCR, 146 ECR, 147 SP1_REG, /* device control regs */ 148 SP2_REG, /* serial port 2 (7720 only) */ 149 PP_REG, 150 SP_CONTROL_REG, 151 }; 152 153 /* 154 * Return the correct value for the Windex field of the setup packet 155 * for a control endpoint message. See the 7715 datasheet. 156 */ 157 static inline __u16 get_reg_index(enum mos_regs reg) 158 { 159 static const __u16 mos7715_index_lookup_table[] = { 160 0x00, /* THR */ 161 0x00, /* RHR */ 162 0x01, /* IER */ 163 0x02, /* FCR */ 164 0x02, /* ISR */ 165 0x03, /* LCR */ 166 0x04, /* MCR */ 167 0x05, /* LSR */ 168 0x06, /* MSR */ 169 0x07, /* SPR */ 170 0x00, /* DLL */ 171 0x01, /* DLM */ 172 0x00, /* DPR */ 173 0x01, /* DSR */ 174 0x02, /* DCR */ 175 0x0a, /* ECR */ 176 0x01, /* SP1_REG */ 177 0x02, /* SP2_REG (7720 only) */ 178 0x04, /* PP_REG (7715 only) */ 179 0x08, /* SP_CONTROL_REG */ 180 }; 181 return mos7715_index_lookup_table[reg]; 182 } 183 184 /* 185 * Return the correct value for the upper byte of the Wvalue field of 186 * the setup packet for a control endpoint message. 187 */ 188 static inline __u16 get_reg_value(enum mos_regs reg, 189 unsigned int serial_portnum) 190 { 191 if (reg >= SP1_REG) /* control reg */ 192 return 0x0000; 193 194 else if (reg >= DPR) /* parallel port reg (7715 only) */ 195 return 0x0100; 196 197 else /* serial port reg */ 198 return (serial_portnum + 2) << 8; 199 } 200 201 /* 202 * Write data byte to the specified device register. The data is embedded in 203 * the value field of the setup packet. serial_portnum is ignored for registers 204 * not specific to a particular serial port. 205 */ 206 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 207 enum mos_regs reg, __u8 data) 208 { 209 struct usb_device *usbdev = serial->dev; 210 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 211 __u8 request = (__u8)0x0e; 212 __u8 requesttype = (__u8)0x40; 213 __u16 index = get_reg_index(reg); 214 __u16 value = get_reg_value(reg, serial_portnum) + data; 215 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 216 index, NULL, 0, MOS_WDR_TIMEOUT); 217 if (status < 0) 218 dev_err(&usbdev->dev, 219 "mos7720: usb_control_msg() failed: %d", status); 220 return status; 221 } 222 223 /* 224 * Read data byte from the specified device register. The data returned by the 225 * device is embedded in the value field of the setup packet. serial_portnum is 226 * ignored for registers that are not specific to a particular serial port. 227 */ 228 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 229 enum mos_regs reg, __u8 *data) 230 { 231 struct usb_device *usbdev = serial->dev; 232 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 233 __u8 request = (__u8)0x0d; 234 __u8 requesttype = (__u8)0xc0; 235 __u16 index = get_reg_index(reg); 236 __u16 value = get_reg_value(reg, serial_portnum); 237 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 238 index, data, 1, MOS_WDR_TIMEOUT); 239 if (status < 0) 240 dev_err(&usbdev->dev, 241 "mos7720: usb_control_msg() failed: %d", status); 242 return status; 243 } 244 245 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 246 247 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 248 enum mos7715_pp_modes mode) 249 { 250 mos_parport->shadowECR = mode; 251 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 252 return 0; 253 } 254 255 static void destroy_mos_parport(struct kref *kref) 256 { 257 struct mos7715_parport *mos_parport = 258 container_of(kref, struct mos7715_parport, ref_count); 259 260 kfree(mos_parport); 261 } 262 263 static void destroy_urbtracker(struct kref *kref) 264 { 265 struct urbtracker *urbtrack = 266 container_of(kref, struct urbtracker, ref_count); 267 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 268 269 usb_free_urb(urbtrack->urb); 270 kfree(urbtrack); 271 kref_put(&mos_parport->ref_count, destroy_mos_parport); 272 } 273 274 /* 275 * This runs as a tasklet when sending an urb in a non-blocking parallel 276 * port callback had to be deferred because the disconnect mutex could not be 277 * obtained at the time. 278 */ 279 static void send_deferred_urbs(unsigned long _mos_parport) 280 { 281 int ret_val; 282 unsigned long flags; 283 struct mos7715_parport *mos_parport = (void *)_mos_parport; 284 struct urbtracker *urbtrack; 285 struct list_head *cursor, *next; 286 287 /* if release function ran, game over */ 288 if (unlikely(mos_parport->serial == NULL)) 289 return; 290 291 /* try again to get the mutex */ 292 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 293 dbg("%s: rescheduling tasklet", __func__); 294 tasklet_schedule(&mos_parport->urb_tasklet); 295 return; 296 } 297 298 /* if device disconnected, game over */ 299 if (unlikely(mos_parport->serial->disconnected)) { 300 mutex_unlock(&mos_parport->serial->disc_mutex); 301 return; 302 } 303 304 spin_lock_irqsave(&mos_parport->listlock, flags); 305 if (list_empty(&mos_parport->deferred_urbs)) { 306 spin_unlock_irqrestore(&mos_parport->listlock, flags); 307 mutex_unlock(&mos_parport->serial->disc_mutex); 308 dbg("%s: deferred_urbs list empty", __func__); 309 return; 310 } 311 312 /* move contents of deferred_urbs list to active_urbs list and submit */ 313 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 314 list_move_tail(cursor, &mos_parport->active_urbs); 315 list_for_each_entry(urbtrack, &mos_parport->active_urbs, 316 urblist_entry) { 317 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 318 dbg("%s: urb submitted", __func__); 319 if (ret_val) { 320 dev_err(&mos_parport->serial->dev->dev, 321 "usb_submit_urb() failed: %d", ret_val); 322 list_del(&urbtrack->urblist_entry); 323 kref_put(&urbtrack->ref_count, destroy_urbtracker); 324 } 325 } 326 spin_unlock_irqrestore(&mos_parport->listlock, flags); 327 mutex_unlock(&mos_parport->serial->disc_mutex); 328 } 329 330 /* callback for parallel port control urbs submitted asynchronously */ 331 static void async_complete(struct urb *urb) 332 { 333 struct urbtracker *urbtrack = urb->context; 334 int status = urb->status; 335 336 if (unlikely(status)) 337 dbg("%s - nonzero urb status received: %d", __func__, status); 338 339 /* remove the urbtracker from the active_urbs list */ 340 spin_lock(&urbtrack->mos_parport->listlock); 341 list_del(&urbtrack->urblist_entry); 342 spin_unlock(&urbtrack->mos_parport->listlock); 343 kref_put(&urbtrack->ref_count, destroy_urbtracker); 344 } 345 346 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 347 enum mos_regs reg, __u8 data) 348 { 349 struct urbtracker *urbtrack; 350 int ret_val; 351 unsigned long flags; 352 struct usb_ctrlrequest setup; 353 struct usb_serial *serial = mos_parport->serial; 354 struct usb_device *usbdev = serial->dev; 355 356 /* create and initialize the control urb and containing urbtracker */ 357 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 358 if (urbtrack == NULL) { 359 dev_err(&usbdev->dev, "out of memory"); 360 return -ENOMEM; 361 } 362 kref_get(&mos_parport->ref_count); 363 urbtrack->mos_parport = mos_parport; 364 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 365 if (urbtrack->urb == NULL) { 366 dev_err(&usbdev->dev, "out of urbs"); 367 kfree(urbtrack); 368 return -ENOMEM; 369 } 370 setup.bRequestType = (__u8)0x40; 371 setup.bRequest = (__u8)0x0e; 372 setup.wValue = get_reg_value(reg, dummy); 373 setup.wIndex = get_reg_index(reg); 374 setup.wLength = 0; 375 usb_fill_control_urb(urbtrack->urb, usbdev, 376 usb_sndctrlpipe(usbdev, 0), 377 (unsigned char *)&setup, 378 NULL, 0, async_complete, urbtrack); 379 kref_init(&urbtrack->ref_count); 380 INIT_LIST_HEAD(&urbtrack->urblist_entry); 381 382 /* 383 * get the disconnect mutex, or add tracker to the deferred_urbs list 384 * and schedule a tasklet to try again later 385 */ 386 if (!mutex_trylock(&serial->disc_mutex)) { 387 spin_lock_irqsave(&mos_parport->listlock, flags); 388 list_add_tail(&urbtrack->urblist_entry, 389 &mos_parport->deferred_urbs); 390 spin_unlock_irqrestore(&mos_parport->listlock, flags); 391 tasklet_schedule(&mos_parport->urb_tasklet); 392 dbg("tasklet scheduled"); 393 return 0; 394 } 395 396 /* bail if device disconnected */ 397 if (serial->disconnected) { 398 kref_put(&urbtrack->ref_count, destroy_urbtracker); 399 mutex_unlock(&serial->disc_mutex); 400 return -ENODEV; 401 } 402 403 /* add the tracker to the active_urbs list and submit */ 404 spin_lock_irqsave(&mos_parport->listlock, flags); 405 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 406 spin_unlock_irqrestore(&mos_parport->listlock, flags); 407 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 408 mutex_unlock(&serial->disc_mutex); 409 if (ret_val) { 410 dev_err(&usbdev->dev, 411 "%s: submit_urb() failed: %d", __func__, ret_val); 412 spin_lock_irqsave(&mos_parport->listlock, flags); 413 list_del(&urbtrack->urblist_entry); 414 spin_unlock_irqrestore(&mos_parport->listlock, flags); 415 kref_put(&urbtrack->ref_count, destroy_urbtracker); 416 return ret_val; 417 } 418 return 0; 419 } 420 421 /* 422 * This is the the common top part of all parallel port callback operations that 423 * send synchronous messages to the device. This implements convoluted locking 424 * that avoids two scenarios: (1) a port operation is called after usbserial 425 * has called our release function, at which point struct mos7715_parport has 426 * been destroyed, and (2) the device has been disconnected, but usbserial has 427 * not called the release function yet because someone has a serial port open. 428 * The shared release_lock prevents the first, and the mutex and disconnected 429 * flag maintained by usbserial covers the second. We also use the msg_pending 430 * flag to ensure that all synchronous usb messgage calls have completed before 431 * our release function can return. 432 */ 433 static int parport_prologue(struct parport *pp) 434 { 435 struct mos7715_parport *mos_parport; 436 437 spin_lock(&release_lock); 438 mos_parport = pp->private_data; 439 if (unlikely(mos_parport == NULL)) { 440 /* release fn called, port struct destroyed */ 441 spin_unlock(&release_lock); 442 return -1; 443 } 444 mos_parport->msg_pending = true; /* synch usb call pending */ 445 INIT_COMPLETION(mos_parport->syncmsg_compl); 446 spin_unlock(&release_lock); 447 448 mutex_lock(&mos_parport->serial->disc_mutex); 449 if (mos_parport->serial->disconnected) { 450 /* device disconnected */ 451 mutex_unlock(&mos_parport->serial->disc_mutex); 452 mos_parport->msg_pending = false; 453 complete(&mos_parport->syncmsg_compl); 454 return -1; 455 } 456 457 return 0; 458 } 459 460 /* 461 * This is the the common bottom part of all parallel port functions that send 462 * synchronous messages to the device. 463 */ 464 static inline void parport_epilogue(struct parport *pp) 465 { 466 struct mos7715_parport *mos_parport = pp->private_data; 467 mutex_unlock(&mos_parport->serial->disc_mutex); 468 mos_parport->msg_pending = false; 469 complete(&mos_parport->syncmsg_compl); 470 } 471 472 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 473 { 474 struct mos7715_parport *mos_parport = pp->private_data; 475 476 if (parport_prologue(pp) < 0) 477 return; 478 mos7715_change_mode(mos_parport, SPP); 479 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 480 parport_epilogue(pp); 481 } 482 483 static unsigned char parport_mos7715_read_data(struct parport *pp) 484 { 485 struct mos7715_parport *mos_parport = pp->private_data; 486 unsigned char d; 487 488 if (parport_prologue(pp) < 0) 489 return 0; 490 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 491 parport_epilogue(pp); 492 return d; 493 } 494 495 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 496 { 497 struct mos7715_parport *mos_parport = pp->private_data; 498 __u8 data; 499 500 if (parport_prologue(pp) < 0) 501 return; 502 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 503 write_mos_reg(mos_parport->serial, dummy, DCR, data); 504 mos_parport->shadowDCR = data; 505 parport_epilogue(pp); 506 } 507 508 static unsigned char parport_mos7715_read_control(struct parport *pp) 509 { 510 struct mos7715_parport *mos_parport = pp->private_data; 511 __u8 dcr; 512 513 spin_lock(&release_lock); 514 mos_parport = pp->private_data; 515 if (unlikely(mos_parport == NULL)) { 516 spin_unlock(&release_lock); 517 return 0; 518 } 519 dcr = mos_parport->shadowDCR & 0x0f; 520 spin_unlock(&release_lock); 521 return dcr; 522 } 523 524 static unsigned char parport_mos7715_frob_control(struct parport *pp, 525 unsigned char mask, 526 unsigned char val) 527 { 528 struct mos7715_parport *mos_parport = pp->private_data; 529 __u8 dcr; 530 531 mask &= 0x0f; 532 val &= 0x0f; 533 if (parport_prologue(pp) < 0) 534 return 0; 535 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 536 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 537 dcr = mos_parport->shadowDCR & 0x0f; 538 parport_epilogue(pp); 539 return dcr; 540 } 541 542 static unsigned char parport_mos7715_read_status(struct parport *pp) 543 { 544 unsigned char status; 545 struct mos7715_parport *mos_parport = pp->private_data; 546 547 spin_lock(&release_lock); 548 mos_parport = pp->private_data; 549 if (unlikely(mos_parport == NULL)) { /* release called */ 550 spin_unlock(&release_lock); 551 return 0; 552 } 553 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 554 spin_unlock(&release_lock); 555 return status; 556 } 557 558 static void parport_mos7715_enable_irq(struct parport *pp) 559 { 560 } 561 562 static void parport_mos7715_disable_irq(struct parport *pp) 563 { 564 } 565 566 static void parport_mos7715_data_forward(struct parport *pp) 567 { 568 struct mos7715_parport *mos_parport = pp->private_data; 569 570 if (parport_prologue(pp) < 0) 571 return; 572 mos7715_change_mode(mos_parport, PS2); 573 mos_parport->shadowDCR &= ~0x20; 574 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 575 parport_epilogue(pp); 576 } 577 578 static void parport_mos7715_data_reverse(struct parport *pp) 579 { 580 struct mos7715_parport *mos_parport = pp->private_data; 581 582 if (parport_prologue(pp) < 0) 583 return; 584 mos7715_change_mode(mos_parport, PS2); 585 mos_parport->shadowDCR |= 0x20; 586 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 587 parport_epilogue(pp); 588 } 589 590 static void parport_mos7715_init_state(struct pardevice *dev, 591 struct parport_state *s) 592 { 593 s->u.pc.ctr = DCR_INIT_VAL; 594 s->u.pc.ecr = ECR_INIT_VAL; 595 } 596 597 /* N.B. Parport core code requires that this function not block */ 598 static void parport_mos7715_save_state(struct parport *pp, 599 struct parport_state *s) 600 { 601 struct mos7715_parport *mos_parport; 602 603 spin_lock(&release_lock); 604 mos_parport = pp->private_data; 605 if (unlikely(mos_parport == NULL)) { /* release called */ 606 spin_unlock(&release_lock); 607 return; 608 } 609 s->u.pc.ctr = mos_parport->shadowDCR; 610 s->u.pc.ecr = mos_parport->shadowECR; 611 spin_unlock(&release_lock); 612 } 613 614 /* N.B. Parport core code requires that this function not block */ 615 static void parport_mos7715_restore_state(struct parport *pp, 616 struct parport_state *s) 617 { 618 struct mos7715_parport *mos_parport; 619 620 spin_lock(&release_lock); 621 mos_parport = pp->private_data; 622 if (unlikely(mos_parport == NULL)) { /* release called */ 623 spin_unlock(&release_lock); 624 return; 625 } 626 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 627 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 628 spin_unlock(&release_lock); 629 } 630 631 static size_t parport_mos7715_write_compat(struct parport *pp, 632 const void *buffer, 633 size_t len, int flags) 634 { 635 int retval; 636 struct mos7715_parport *mos_parport = pp->private_data; 637 int actual_len; 638 639 if (parport_prologue(pp) < 0) 640 return 0; 641 mos7715_change_mode(mos_parport, PPF); 642 retval = usb_bulk_msg(mos_parport->serial->dev, 643 usb_sndbulkpipe(mos_parport->serial->dev, 2), 644 (void *)buffer, len, &actual_len, 645 MOS_WDR_TIMEOUT); 646 parport_epilogue(pp); 647 if (retval) { 648 dev_err(&mos_parport->serial->dev->dev, 649 "mos7720: usb_bulk_msg() failed: %d", retval); 650 return 0; 651 } 652 return actual_len; 653 } 654 655 static struct parport_operations parport_mos7715_ops = { 656 .owner = THIS_MODULE, 657 .write_data = parport_mos7715_write_data, 658 .read_data = parport_mos7715_read_data, 659 660 .write_control = parport_mos7715_write_control, 661 .read_control = parport_mos7715_read_control, 662 .frob_control = parport_mos7715_frob_control, 663 664 .read_status = parport_mos7715_read_status, 665 666 .enable_irq = parport_mos7715_enable_irq, 667 .disable_irq = parport_mos7715_disable_irq, 668 669 .data_forward = parport_mos7715_data_forward, 670 .data_reverse = parport_mos7715_data_reverse, 671 672 .init_state = parport_mos7715_init_state, 673 .save_state = parport_mos7715_save_state, 674 .restore_state = parport_mos7715_restore_state, 675 676 .compat_write_data = parport_mos7715_write_compat, 677 678 .nibble_read_data = parport_ieee1284_read_nibble, 679 .byte_read_data = parport_ieee1284_read_byte, 680 }; 681 682 /* 683 * Allocate and initialize parallel port control struct, initialize 684 * the parallel port hardware device, and register with the parport subsystem. 685 */ 686 static int mos7715_parport_init(struct usb_serial *serial) 687 { 688 struct mos7715_parport *mos_parport; 689 690 /* allocate and initialize parallel port control struct */ 691 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 692 if (mos_parport == NULL) { 693 dbg("mos7715_parport_init: kzalloc failed"); 694 return -ENOMEM; 695 } 696 mos_parport->msg_pending = false; 697 kref_init(&mos_parport->ref_count); 698 spin_lock_init(&mos_parport->listlock); 699 INIT_LIST_HEAD(&mos_parport->active_urbs); 700 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 701 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 702 mos_parport->serial = serial; 703 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 704 (unsigned long) mos_parport); 705 init_completion(&mos_parport->syncmsg_compl); 706 707 /* cycle parallel port reset bit */ 708 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 709 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 710 711 /* initialize device registers */ 712 mos_parport->shadowDCR = DCR_INIT_VAL; 713 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 714 mos_parport->shadowECR = ECR_INIT_VAL; 715 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 716 717 /* register with parport core */ 718 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 719 PARPORT_DMA_NONE, 720 &parport_mos7715_ops); 721 if (mos_parport->pp == NULL) { 722 dev_err(&serial->interface->dev, 723 "Could not register parport\n"); 724 kref_put(&mos_parport->ref_count, destroy_mos_parport); 725 return -EIO; 726 } 727 mos_parport->pp->private_data = mos_parport; 728 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 729 mos_parport->pp->dev = &serial->interface->dev; 730 parport_announce_port(mos_parport->pp); 731 732 return 0; 733 } 734 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 735 736 /* 737 * mos7720_interrupt_callback 738 * this is the callback function for when we have received data on the 739 * interrupt endpoint. 740 */ 741 static void mos7720_interrupt_callback(struct urb *urb) 742 { 743 int result; 744 int length; 745 int status = urb->status; 746 __u8 *data; 747 __u8 sp1; 748 __u8 sp2; 749 750 switch (status) { 751 case 0: 752 /* success */ 753 break; 754 case -ECONNRESET: 755 case -ENOENT: 756 case -ESHUTDOWN: 757 /* this urb is terminated, clean up */ 758 dbg("%s - urb shutting down with status: %d", __func__, 759 status); 760 return; 761 default: 762 dbg("%s - nonzero urb status received: %d", __func__, 763 status); 764 goto exit; 765 } 766 767 length = urb->actual_length; 768 data = urb->transfer_buffer; 769 770 /* Moschip get 4 bytes 771 * Byte 1 IIR Port 1 (port.number is 0) 772 * Byte 2 IIR Port 2 (port.number is 1) 773 * Byte 3 -------------- 774 * Byte 4 FIFO status for both */ 775 776 /* the above description is inverted 777 * oneukum 2007-03-14 */ 778 779 if (unlikely(length != 4)) { 780 dbg("Wrong data !!!"); 781 return; 782 } 783 784 sp1 = data[3]; 785 sp2 = data[2]; 786 787 if ((sp1 | sp2) & 0x01) { 788 /* No Interrupt Pending in both the ports */ 789 dbg("No Interrupt !!!"); 790 } else { 791 switch (sp1 & 0x0f) { 792 case SERIAL_IIR_RLS: 793 dbg("Serial Port 1: Receiver status error or address " 794 "bit detected in 9-bit mode\n"); 795 break; 796 case SERIAL_IIR_CTI: 797 dbg("Serial Port 1: Receiver time out"); 798 break; 799 case SERIAL_IIR_MS: 800 /* dbg("Serial Port 1: Modem status change"); */ 801 break; 802 } 803 804 switch (sp2 & 0x0f) { 805 case SERIAL_IIR_RLS: 806 dbg("Serial Port 2: Receiver status error or address " 807 "bit detected in 9-bit mode"); 808 break; 809 case SERIAL_IIR_CTI: 810 dbg("Serial Port 2: Receiver time out"); 811 break; 812 case SERIAL_IIR_MS: 813 /* dbg("Serial Port 2: Modem status change"); */ 814 break; 815 } 816 } 817 818 exit: 819 result = usb_submit_urb(urb, GFP_ATOMIC); 820 if (result) 821 dev_err(&urb->dev->dev, 822 "%s - Error %d submitting control urb\n", 823 __func__, result); 824 } 825 826 /* 827 * mos7715_interrupt_callback 828 * this is the 7715's callback function for when we have received data on 829 * the interrupt endpoint. 830 */ 831 static void mos7715_interrupt_callback(struct urb *urb) 832 { 833 int result; 834 int length; 835 int status = urb->status; 836 __u8 *data; 837 __u8 iir; 838 839 switch (status) { 840 case 0: 841 /* success */ 842 break; 843 case -ECONNRESET: 844 case -ENOENT: 845 case -ESHUTDOWN: 846 case -ENODEV: 847 /* this urb is terminated, clean up */ 848 dbg("%s - urb shutting down with status: %d", __func__, 849 status); 850 return; 851 default: 852 dbg("%s - nonzero urb status received: %d", __func__, 853 status); 854 goto exit; 855 } 856 857 length = urb->actual_length; 858 data = urb->transfer_buffer; 859 860 /* Structure of data from 7715 device: 861 * Byte 1: IIR serial Port 862 * Byte 2: unused 863 * Byte 2: DSR parallel port 864 * Byte 4: FIFO status for both */ 865 866 if (unlikely(length != 4)) { 867 dbg("Wrong data !!!"); 868 return; 869 } 870 871 iir = data[0]; 872 if (!(iir & 0x01)) { /* serial port interrupt pending */ 873 switch (iir & 0x0f) { 874 case SERIAL_IIR_RLS: 875 dbg("Serial Port: Receiver status error or address " 876 "bit detected in 9-bit mode\n"); 877 break; 878 case SERIAL_IIR_CTI: 879 dbg("Serial Port: Receiver time out"); 880 break; 881 case SERIAL_IIR_MS: 882 /* dbg("Serial Port: Modem status change"); */ 883 break; 884 } 885 } 886 887 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 888 { /* update local copy of DSR reg */ 889 struct usb_serial_port *port = urb->context; 890 struct mos7715_parport *mos_parport = port->serial->private; 891 if (unlikely(mos_parport == NULL)) 892 return; 893 atomic_set(&mos_parport->shadowDSR, data[2]); 894 } 895 #endif 896 897 exit: 898 result = usb_submit_urb(urb, GFP_ATOMIC); 899 if (result) 900 dev_err(&urb->dev->dev, 901 "%s - Error %d submitting control urb\n", 902 __func__, result); 903 } 904 905 /* 906 * mos7720_bulk_in_callback 907 * this is the callback function for when we have received data on the 908 * bulk in endpoint. 909 */ 910 static void mos7720_bulk_in_callback(struct urb *urb) 911 { 912 int retval; 913 unsigned char *data ; 914 struct usb_serial_port *port; 915 struct tty_struct *tty; 916 int status = urb->status; 917 918 if (status) { 919 dbg("nonzero read bulk status received: %d", status); 920 return; 921 } 922 923 port = urb->context; 924 925 dbg("Entering...%s", __func__); 926 927 data = urb->transfer_buffer; 928 929 tty = tty_port_tty_get(&port->port); 930 if (tty && urb->actual_length) { 931 tty_insert_flip_string(tty, data, urb->actual_length); 932 tty_flip_buffer_push(tty); 933 } 934 tty_kref_put(tty); 935 936 if (port->read_urb->status != -EINPROGRESS) { 937 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 938 if (retval) 939 dbg("usb_submit_urb(read bulk) failed, retval = %d", 940 retval); 941 } 942 } 943 944 /* 945 * mos7720_bulk_out_data_callback 946 * this is the callback function for when we have finished sending serial 947 * data on the bulk out endpoint. 948 */ 949 static void mos7720_bulk_out_data_callback(struct urb *urb) 950 { 951 struct moschip_port *mos7720_port; 952 struct tty_struct *tty; 953 int status = urb->status; 954 955 if (status) { 956 dbg("nonzero write bulk status received:%d", status); 957 return; 958 } 959 960 mos7720_port = urb->context; 961 if (!mos7720_port) { 962 dbg("NULL mos7720_port pointer"); 963 return ; 964 } 965 966 tty = tty_port_tty_get(&mos7720_port->port->port); 967 968 if (tty && mos7720_port->open) 969 tty_wakeup(tty); 970 tty_kref_put(tty); 971 } 972 973 /* 974 * mos77xx_probe 975 * this function installs the appropriate read interrupt endpoint callback 976 * depending on whether the device is a 7720 or 7715, thus avoiding costly 977 * run-time checks in the high-frequency callback routine itself. 978 */ 979 static int mos77xx_probe(struct usb_serial *serial, 980 const struct usb_device_id *id) 981 { 982 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 983 moschip7720_2port_driver.read_int_callback = 984 mos7715_interrupt_callback; 985 else 986 moschip7720_2port_driver.read_int_callback = 987 mos7720_interrupt_callback; 988 989 return 0; 990 } 991 992 static int mos77xx_calc_num_ports(struct usb_serial *serial) 993 { 994 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 995 if (product == MOSCHIP_DEVICE_ID_7715) 996 return 1; 997 998 return 2; 999 } 1000 1001 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 1002 { 1003 struct usb_serial *serial; 1004 struct urb *urb; 1005 struct moschip_port *mos7720_port; 1006 int response; 1007 int port_number; 1008 __u8 data; 1009 int allocated_urbs = 0; 1010 int j; 1011 1012 serial = port->serial; 1013 1014 mos7720_port = usb_get_serial_port_data(port); 1015 if (mos7720_port == NULL) 1016 return -ENODEV; 1017 1018 usb_clear_halt(serial->dev, port->write_urb->pipe); 1019 usb_clear_halt(serial->dev, port->read_urb->pipe); 1020 1021 /* Initialising the write urb pool */ 1022 for (j = 0; j < NUM_URBS; ++j) { 1023 urb = usb_alloc_urb(0, GFP_KERNEL); 1024 mos7720_port->write_urb_pool[j] = urb; 1025 1026 if (urb == NULL) { 1027 dev_err(&port->dev, "No more urbs???\n"); 1028 continue; 1029 } 1030 1031 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1032 GFP_KERNEL); 1033 if (!urb->transfer_buffer) { 1034 dev_err(&port->dev, 1035 "%s-out of memory for urb buffers.\n", 1036 __func__); 1037 usb_free_urb(mos7720_port->write_urb_pool[j]); 1038 mos7720_port->write_urb_pool[j] = NULL; 1039 continue; 1040 } 1041 allocated_urbs++; 1042 } 1043 1044 if (!allocated_urbs) 1045 return -ENOMEM; 1046 1047 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1048 * 1049 * Register Index 1050 * 0 : THR/RHR 1051 * 1 : IER 1052 * 2 : FCR 1053 * 3 : LCR 1054 * 4 : MCR 1055 * 5 : LSR 1056 * 6 : MSR 1057 * 7 : SPR 1058 * 1059 * 0x08 : SP1/2 Control Reg 1060 */ 1061 port_number = port->number - port->serial->minor; 1062 read_mos_reg(serial, port_number, LSR, &data); 1063 1064 dbg("SS::%p LSR:%x", mos7720_port, data); 1065 1066 dbg("Check:Sending Command .........."); 1067 1068 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1069 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1070 1071 write_mos_reg(serial, port_number, IER, 0x00); 1072 write_mos_reg(serial, port_number, FCR, 0x00); 1073 1074 write_mos_reg(serial, port_number, FCR, 0xcf); 1075 mos7720_port->shadowLCR = 0x03; 1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1077 mos7720_port->shadowMCR = 0x0b; 1078 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1079 1080 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1081 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1082 data = data | (port->number - port->serial->minor + 1); 1083 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1084 mos7720_port->shadowLCR = 0x83; 1085 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1086 write_mos_reg(serial, port_number, THR, 0x0c); 1087 write_mos_reg(serial, port_number, IER, 0x00); 1088 mos7720_port->shadowLCR = 0x03; 1089 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1090 write_mos_reg(serial, port_number, IER, 0x0c); 1091 1092 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1093 if (response) 1094 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1095 __func__, response); 1096 1097 /* initialize our icount structure */ 1098 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1099 1100 /* initialize our port settings */ 1101 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1102 1103 /* send a open port command */ 1104 mos7720_port->open = 1; 1105 1106 return 0; 1107 } 1108 1109 /* 1110 * mos7720_chars_in_buffer 1111 * this function is called by the tty driver when it wants to know how many 1112 * bytes of data we currently have outstanding in the port (data that has 1113 * been written, but hasn't made it out the port yet) 1114 * If successful, we return the number of bytes left to be written in the 1115 * system, 1116 * Otherwise we return a negative error number. 1117 */ 1118 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1119 { 1120 struct usb_serial_port *port = tty->driver_data; 1121 int i; 1122 int chars = 0; 1123 struct moschip_port *mos7720_port; 1124 1125 dbg("%s:entering ...........", __func__); 1126 1127 mos7720_port = usb_get_serial_port_data(port); 1128 if (mos7720_port == NULL) { 1129 dbg("%s:leaving ...........", __func__); 1130 return 0; 1131 } 1132 1133 for (i = 0; i < NUM_URBS; ++i) { 1134 if (mos7720_port->write_urb_pool[i] && 1135 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1136 chars += URB_TRANSFER_BUFFER_SIZE; 1137 } 1138 dbg("%s - returns %d", __func__, chars); 1139 return chars; 1140 } 1141 1142 static void mos7720_close(struct usb_serial_port *port) 1143 { 1144 struct usb_serial *serial; 1145 struct moschip_port *mos7720_port; 1146 int j; 1147 1148 dbg("mos7720_close:entering..."); 1149 1150 serial = port->serial; 1151 1152 mos7720_port = usb_get_serial_port_data(port); 1153 if (mos7720_port == NULL) 1154 return; 1155 1156 for (j = 0; j < NUM_URBS; ++j) 1157 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1158 1159 /* Freeing Write URBs */ 1160 for (j = 0; j < NUM_URBS; ++j) { 1161 if (mos7720_port->write_urb_pool[j]) { 1162 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1163 usb_free_urb(mos7720_port->write_urb_pool[j]); 1164 } 1165 } 1166 1167 /* While closing port, shutdown all bulk read, write * 1168 * and interrupt read if they exists, otherwise nop */ 1169 dbg("Shutdown bulk write"); 1170 usb_kill_urb(port->write_urb); 1171 dbg("Shutdown bulk read"); 1172 usb_kill_urb(port->read_urb); 1173 1174 mutex_lock(&serial->disc_mutex); 1175 /* these commands must not be issued if the device has 1176 * been disconnected */ 1177 if (!serial->disconnected) { 1178 write_mos_reg(serial, port->number - port->serial->minor, 1179 MCR, 0x00); 1180 write_mos_reg(serial, port->number - port->serial->minor, 1181 IER, 0x00); 1182 } 1183 mutex_unlock(&serial->disc_mutex); 1184 mos7720_port->open = 0; 1185 1186 dbg("Leaving %s", __func__); 1187 } 1188 1189 static void mos7720_break(struct tty_struct *tty, int break_state) 1190 { 1191 struct usb_serial_port *port = tty->driver_data; 1192 unsigned char data; 1193 struct usb_serial *serial; 1194 struct moschip_port *mos7720_port; 1195 1196 dbg("Entering %s", __func__); 1197 1198 serial = port->serial; 1199 1200 mos7720_port = usb_get_serial_port_data(port); 1201 if (mos7720_port == NULL) 1202 return; 1203 1204 if (break_state == -1) 1205 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1206 else 1207 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1208 1209 mos7720_port->shadowLCR = data; 1210 write_mos_reg(serial, port->number - port->serial->minor, 1211 LCR, mos7720_port->shadowLCR); 1212 } 1213 1214 /* 1215 * mos7720_write_room 1216 * this function is called by the tty driver when it wants to know how many 1217 * bytes of data we can accept for a specific port. 1218 * If successful, we return the amount of room that we have for this port 1219 * Otherwise we return a negative error number. 1220 */ 1221 static int mos7720_write_room(struct tty_struct *tty) 1222 { 1223 struct usb_serial_port *port = tty->driver_data; 1224 struct moschip_port *mos7720_port; 1225 int room = 0; 1226 int i; 1227 1228 dbg("%s:entering ...........", __func__); 1229 1230 mos7720_port = usb_get_serial_port_data(port); 1231 if (mos7720_port == NULL) { 1232 dbg("%s:leaving ...........", __func__); 1233 return -ENODEV; 1234 } 1235 1236 /* FIXME: Locking */ 1237 for (i = 0; i < NUM_URBS; ++i) { 1238 if (mos7720_port->write_urb_pool[i] && 1239 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1240 room += URB_TRANSFER_BUFFER_SIZE; 1241 } 1242 1243 dbg("%s - returns %d", __func__, room); 1244 return room; 1245 } 1246 1247 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1248 const unsigned char *data, int count) 1249 { 1250 int status; 1251 int i; 1252 int bytes_sent = 0; 1253 int transfer_size; 1254 1255 struct moschip_port *mos7720_port; 1256 struct usb_serial *serial; 1257 struct urb *urb; 1258 const unsigned char *current_position = data; 1259 1260 dbg("%s:entering ...........", __func__); 1261 1262 serial = port->serial; 1263 1264 mos7720_port = usb_get_serial_port_data(port); 1265 if (mos7720_port == NULL) { 1266 dbg("mos7720_port is NULL"); 1267 return -ENODEV; 1268 } 1269 1270 /* try to find a free urb in the list */ 1271 urb = NULL; 1272 1273 for (i = 0; i < NUM_URBS; ++i) { 1274 if (mos7720_port->write_urb_pool[i] && 1275 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1276 urb = mos7720_port->write_urb_pool[i]; 1277 dbg("URB:%d", i); 1278 break; 1279 } 1280 } 1281 1282 if (urb == NULL) { 1283 dbg("%s - no more free urbs", __func__); 1284 goto exit; 1285 } 1286 1287 if (urb->transfer_buffer == NULL) { 1288 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1289 GFP_KERNEL); 1290 if (urb->transfer_buffer == NULL) { 1291 dev_err_console(port, "%s no more kernel memory...\n", 1292 __func__); 1293 goto exit; 1294 } 1295 } 1296 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1297 1298 memcpy(urb->transfer_buffer, current_position, transfer_size); 1299 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size, 1300 urb->transfer_buffer); 1301 1302 /* fill urb with data and submit */ 1303 usb_fill_bulk_urb(urb, serial->dev, 1304 usb_sndbulkpipe(serial->dev, 1305 port->bulk_out_endpointAddress), 1306 urb->transfer_buffer, transfer_size, 1307 mos7720_bulk_out_data_callback, mos7720_port); 1308 1309 /* send it down the pipe */ 1310 status = usb_submit_urb(urb, GFP_ATOMIC); 1311 if (status) { 1312 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1313 "with status = %d\n", __func__, status); 1314 bytes_sent = status; 1315 goto exit; 1316 } 1317 bytes_sent = transfer_size; 1318 1319 exit: 1320 return bytes_sent; 1321 } 1322 1323 static void mos7720_throttle(struct tty_struct *tty) 1324 { 1325 struct usb_serial_port *port = tty->driver_data; 1326 struct moschip_port *mos7720_port; 1327 int status; 1328 1329 dbg("%s- port %d", __func__, port->number); 1330 1331 mos7720_port = usb_get_serial_port_data(port); 1332 1333 if (mos7720_port == NULL) 1334 return; 1335 1336 if (!mos7720_port->open) { 1337 dbg("port not opened"); 1338 return; 1339 } 1340 1341 dbg("%s: Entering ..........", __func__); 1342 1343 /* if we are implementing XON/XOFF, send the stop character */ 1344 if (I_IXOFF(tty)) { 1345 unsigned char stop_char = STOP_CHAR(tty); 1346 status = mos7720_write(tty, port, &stop_char, 1); 1347 if (status <= 0) 1348 return; 1349 } 1350 1351 /* if we are implementing RTS/CTS, toggle that line */ 1352 if (tty->termios->c_cflag & CRTSCTS) { 1353 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1354 write_mos_reg(port->serial, port->number - port->serial->minor, 1355 MCR, mos7720_port->shadowMCR); 1356 if (status != 0) 1357 return; 1358 } 1359 } 1360 1361 static void mos7720_unthrottle(struct tty_struct *tty) 1362 { 1363 struct usb_serial_port *port = tty->driver_data; 1364 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1365 int status; 1366 1367 if (mos7720_port == NULL) 1368 return; 1369 1370 if (!mos7720_port->open) { 1371 dbg("%s - port not opened", __func__); 1372 return; 1373 } 1374 1375 dbg("%s: Entering ..........", __func__); 1376 1377 /* if we are implementing XON/XOFF, send the start character */ 1378 if (I_IXOFF(tty)) { 1379 unsigned char start_char = START_CHAR(tty); 1380 status = mos7720_write(tty, port, &start_char, 1); 1381 if (status <= 0) 1382 return; 1383 } 1384 1385 /* if we are implementing RTS/CTS, toggle that line */ 1386 if (tty->termios->c_cflag & CRTSCTS) { 1387 mos7720_port->shadowMCR |= UART_MCR_RTS; 1388 write_mos_reg(port->serial, port->number - port->serial->minor, 1389 MCR, mos7720_port->shadowMCR); 1390 if (status != 0) 1391 return; 1392 } 1393 } 1394 1395 /* FIXME: this function does not work */ 1396 static int set_higher_rates(struct moschip_port *mos7720_port, 1397 unsigned int baud) 1398 { 1399 struct usb_serial_port *port; 1400 struct usb_serial *serial; 1401 int port_number; 1402 enum mos_regs sp_reg; 1403 if (mos7720_port == NULL) 1404 return -EINVAL; 1405 1406 port = mos7720_port->port; 1407 serial = port->serial; 1408 1409 /*********************************************** 1410 * Init Sequence for higher rates 1411 ***********************************************/ 1412 dbg("Sending Setting Commands .........."); 1413 port_number = port->number - port->serial->minor; 1414 1415 write_mos_reg(serial, port_number, IER, 0x00); 1416 write_mos_reg(serial, port_number, FCR, 0x00); 1417 write_mos_reg(serial, port_number, FCR, 0xcf); 1418 mos7720_port->shadowMCR = 0x0b; 1419 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1420 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1421 1422 /*********************************************** 1423 * Set for higher rates * 1424 ***********************************************/ 1425 /* writing baud rate verbatum into uart clock field clearly not right */ 1426 if (port_number == 0) 1427 sp_reg = SP1_REG; 1428 else 1429 sp_reg = SP2_REG; 1430 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1431 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1432 mos7720_port->shadowMCR = 0x2b; 1433 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1434 1435 /*********************************************** 1436 * Set DLL/DLM 1437 ***********************************************/ 1438 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1439 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1440 write_mos_reg(serial, port_number, DLL, 0x01); 1441 write_mos_reg(serial, port_number, DLM, 0x00); 1442 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1443 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1444 1445 return 0; 1446 } 1447 1448 /* baud rate information */ 1449 struct divisor_table_entry { 1450 __u32 baudrate; 1451 __u16 divisor; 1452 }; 1453 1454 /* Define table of divisors for moschip 7720 hardware * 1455 * These assume a 3.6864MHz crystal, the standard /16, and * 1456 * MCR.7 = 0. */ 1457 static struct divisor_table_entry divisor_table[] = { 1458 { 50, 2304}, 1459 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1460 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1461 { 150, 768}, 1462 { 300, 384}, 1463 { 600, 192}, 1464 { 1200, 96}, 1465 { 1800, 64}, 1466 { 2400, 48}, 1467 { 4800, 24}, 1468 { 7200, 16}, 1469 { 9600, 12}, 1470 { 19200, 6}, 1471 { 38400, 3}, 1472 { 57600, 2}, 1473 { 115200, 1}, 1474 }; 1475 1476 /***************************************************************************** 1477 * calc_baud_rate_divisor 1478 * this function calculates the proper baud rate divisor for the specified 1479 * baud rate. 1480 *****************************************************************************/ 1481 static int calc_baud_rate_divisor(int baudrate, int *divisor) 1482 { 1483 int i; 1484 __u16 custom; 1485 __u16 round1; 1486 __u16 round; 1487 1488 1489 dbg("%s - %d", __func__, baudrate); 1490 1491 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1492 if (divisor_table[i].baudrate == baudrate) { 1493 *divisor = divisor_table[i].divisor; 1494 return 0; 1495 } 1496 } 1497 1498 /* After trying for all the standard baud rates * 1499 * Try calculating the divisor for this baud rate */ 1500 if (baudrate > 75 && baudrate < 230400) { 1501 /* get the divisor */ 1502 custom = (__u16)(230400L / baudrate); 1503 1504 /* Check for round off */ 1505 round1 = (__u16)(2304000L / baudrate); 1506 round = (__u16)(round1 - (custom * 10)); 1507 if (round > 4) 1508 custom++; 1509 *divisor = custom; 1510 1511 dbg("Baud %d = %d", baudrate, custom); 1512 return 0; 1513 } 1514 1515 dbg("Baud calculation Failed..."); 1516 return -EINVAL; 1517 } 1518 1519 /* 1520 * send_cmd_write_baud_rate 1521 * this function sends the proper command to change the baud rate of the 1522 * specified port. 1523 */ 1524 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1525 int baudrate) 1526 { 1527 struct usb_serial_port *port; 1528 struct usb_serial *serial; 1529 int divisor; 1530 int status; 1531 unsigned char number; 1532 1533 if (mos7720_port == NULL) 1534 return -1; 1535 1536 port = mos7720_port->port; 1537 serial = port->serial; 1538 1539 dbg("%s: Entering ..........", __func__); 1540 1541 number = port->number - port->serial->minor; 1542 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate); 1543 1544 /* Calculate the Divisor */ 1545 status = calc_baud_rate_divisor(baudrate, &divisor); 1546 if (status) { 1547 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1548 return status; 1549 } 1550 1551 /* Enable access to divisor latch */ 1552 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1553 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1554 1555 /* Write the divisor */ 1556 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1557 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1558 1559 /* Disable access to divisor latch */ 1560 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1561 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1562 1563 return status; 1564 } 1565 1566 /* 1567 * change_port_settings 1568 * This routine is called to set the UART on the device to match 1569 * the specified new settings. 1570 */ 1571 static void change_port_settings(struct tty_struct *tty, 1572 struct moschip_port *mos7720_port, 1573 struct ktermios *old_termios) 1574 { 1575 struct usb_serial_port *port; 1576 struct usb_serial *serial; 1577 int baud; 1578 unsigned cflag; 1579 unsigned iflag; 1580 __u8 mask = 0xff; 1581 __u8 lData; 1582 __u8 lParity; 1583 __u8 lStop; 1584 int status; 1585 int port_number; 1586 1587 if (mos7720_port == NULL) 1588 return ; 1589 1590 port = mos7720_port->port; 1591 serial = port->serial; 1592 port_number = port->number - port->serial->minor; 1593 1594 dbg("%s - port %d", __func__, port->number); 1595 1596 if (!mos7720_port->open) { 1597 dbg("%s - port not opened", __func__); 1598 return; 1599 } 1600 1601 dbg("%s: Entering ..........", __func__); 1602 1603 lData = UART_LCR_WLEN8; 1604 lStop = 0x00; /* 1 stop bit */ 1605 lParity = 0x00; /* No parity */ 1606 1607 cflag = tty->termios->c_cflag; 1608 iflag = tty->termios->c_iflag; 1609 1610 /* Change the number of bits */ 1611 switch (cflag & CSIZE) { 1612 case CS5: 1613 lData = UART_LCR_WLEN5; 1614 mask = 0x1f; 1615 break; 1616 1617 case CS6: 1618 lData = UART_LCR_WLEN6; 1619 mask = 0x3f; 1620 break; 1621 1622 case CS7: 1623 lData = UART_LCR_WLEN7; 1624 mask = 0x7f; 1625 break; 1626 default: 1627 case CS8: 1628 lData = UART_LCR_WLEN8; 1629 break; 1630 } 1631 1632 /* Change the Parity bit */ 1633 if (cflag & PARENB) { 1634 if (cflag & PARODD) { 1635 lParity = UART_LCR_PARITY; 1636 dbg("%s - parity = odd", __func__); 1637 } else { 1638 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1639 dbg("%s - parity = even", __func__); 1640 } 1641 1642 } else { 1643 dbg("%s - parity = none", __func__); 1644 } 1645 1646 if (cflag & CMSPAR) 1647 lParity = lParity | 0x20; 1648 1649 /* Change the Stop bit */ 1650 if (cflag & CSTOPB) { 1651 lStop = UART_LCR_STOP; 1652 dbg("%s - stop bits = 2", __func__); 1653 } else { 1654 lStop = 0x00; 1655 dbg("%s - stop bits = 1", __func__); 1656 } 1657 1658 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1659 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1660 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1661 1662 /* Update the LCR with the correct value */ 1663 mos7720_port->shadowLCR &= 1664 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1665 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1666 1667 1668 /* Disable Interrupts */ 1669 write_mos_reg(serial, port_number, IER, 0x00); 1670 write_mos_reg(serial, port_number, FCR, 0x00); 1671 write_mos_reg(serial, port_number, FCR, 0xcf); 1672 1673 /* Send the updated LCR value to the mos7720 */ 1674 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1675 mos7720_port->shadowMCR = 0x0b; 1676 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1677 1678 /* set up the MCR register and send it to the mos7720 */ 1679 mos7720_port->shadowMCR = UART_MCR_OUT2; 1680 if (cflag & CBAUD) 1681 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1682 1683 if (cflag & CRTSCTS) { 1684 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1685 /* To set hardware flow control to the specified * 1686 * serial port, in SP1/2_CONTROL_REG */ 1687 if (port->number) 1688 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1689 else 1690 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1691 1692 } else 1693 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1694 1695 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1696 1697 /* Determine divisor based on baud rate */ 1698 baud = tty_get_baud_rate(tty); 1699 if (!baud) { 1700 /* pick a default, any default... */ 1701 dbg("Picked default baud..."); 1702 baud = 9600; 1703 } 1704 1705 if (baud >= 230400) { 1706 set_higher_rates(mos7720_port, baud); 1707 /* Enable Interrupts */ 1708 write_mos_reg(serial, port_number, IER, 0x0c); 1709 return; 1710 } 1711 1712 dbg("%s - baud rate = %d", __func__, baud); 1713 status = send_cmd_write_baud_rate(mos7720_port, baud); 1714 /* FIXME: needs to write actual resulting baud back not just 1715 blindly do so */ 1716 if (cflag & CBAUD) 1717 tty_encode_baud_rate(tty, baud, baud); 1718 /* Enable Interrupts */ 1719 write_mos_reg(serial, port_number, IER, 0x0c); 1720 1721 if (port->read_urb->status != -EINPROGRESS) { 1722 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1723 if (status) 1724 dbg("usb_submit_urb(read bulk) failed, status = %d", 1725 status); 1726 } 1727 } 1728 1729 /* 1730 * mos7720_set_termios 1731 * this function is called by the tty driver when it wants to change the 1732 * termios structure. 1733 */ 1734 static void mos7720_set_termios(struct tty_struct *tty, 1735 struct usb_serial_port *port, struct ktermios *old_termios) 1736 { 1737 int status; 1738 unsigned int cflag; 1739 struct usb_serial *serial; 1740 struct moschip_port *mos7720_port; 1741 1742 serial = port->serial; 1743 1744 mos7720_port = usb_get_serial_port_data(port); 1745 1746 if (mos7720_port == NULL) 1747 return; 1748 1749 if (!mos7720_port->open) { 1750 dbg("%s - port not opened", __func__); 1751 return; 1752 } 1753 1754 dbg("%s\n", "setting termios - ASPIRE"); 1755 1756 cflag = tty->termios->c_cflag; 1757 1758 dbg("%s - cflag %08x iflag %08x", __func__, 1759 tty->termios->c_cflag, 1760 RELEVANT_IFLAG(tty->termios->c_iflag)); 1761 1762 dbg("%s - old cflag %08x old iflag %08x", __func__, 1763 old_termios->c_cflag, 1764 RELEVANT_IFLAG(old_termios->c_iflag)); 1765 1766 dbg("%s - port %d", __func__, port->number); 1767 1768 /* change the port settings to the new ones specified */ 1769 change_port_settings(tty, mos7720_port, old_termios); 1770 1771 if (port->read_urb->status != -EINPROGRESS) { 1772 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1773 if (status) 1774 dbg("usb_submit_urb(read bulk) failed, status = %d", 1775 status); 1776 } 1777 } 1778 1779 /* 1780 * get_lsr_info - get line status register info 1781 * 1782 * Purpose: Let user call ioctl() to get info when the UART physically 1783 * is emptied. On bus types like RS485, the transmitter must 1784 * release the bus after transmitting. This must be done when 1785 * the transmit shift register is empty, not be done when the 1786 * transmit holding register is empty. This functionality 1787 * allows an RS485 driver to be written in user space. 1788 */ 1789 static int get_lsr_info(struct tty_struct *tty, 1790 struct moschip_port *mos7720_port, unsigned int __user *value) 1791 { 1792 struct usb_serial_port *port = tty->driver_data; 1793 unsigned int result = 0; 1794 unsigned char data = 0; 1795 int port_number = port->number - port->serial->minor; 1796 int count; 1797 1798 count = mos7720_chars_in_buffer(tty); 1799 if (count == 0) { 1800 read_mos_reg(port->serial, port_number, LSR, &data); 1801 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1802 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1803 dbg("%s -- Empty", __func__); 1804 result = TIOCSER_TEMT; 1805 } 1806 } 1807 if (copy_to_user(value, &result, sizeof(int))) 1808 return -EFAULT; 1809 return 0; 1810 } 1811 1812 static int mos7720_tiocmget(struct tty_struct *tty) 1813 { 1814 struct usb_serial_port *port = tty->driver_data; 1815 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1816 unsigned int result = 0; 1817 unsigned int mcr ; 1818 unsigned int msr ; 1819 1820 dbg("%s - port %d", __func__, port->number); 1821 1822 mcr = mos7720_port->shadowMCR; 1823 msr = mos7720_port->shadowMSR; 1824 1825 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1826 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1827 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1828 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1829 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1830 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1831 1832 dbg("%s -- %x", __func__, result); 1833 1834 return result; 1835 } 1836 1837 static int mos7720_tiocmset(struct tty_struct *tty, 1838 unsigned int set, unsigned int clear) 1839 { 1840 struct usb_serial_port *port = tty->driver_data; 1841 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1842 unsigned int mcr ; 1843 dbg("%s - port %d", __func__, port->number); 1844 dbg("he was at tiocmset"); 1845 1846 mcr = mos7720_port->shadowMCR; 1847 1848 if (set & TIOCM_RTS) 1849 mcr |= UART_MCR_RTS; 1850 if (set & TIOCM_DTR) 1851 mcr |= UART_MCR_DTR; 1852 if (set & TIOCM_LOOP) 1853 mcr |= UART_MCR_LOOP; 1854 1855 if (clear & TIOCM_RTS) 1856 mcr &= ~UART_MCR_RTS; 1857 if (clear & TIOCM_DTR) 1858 mcr &= ~UART_MCR_DTR; 1859 if (clear & TIOCM_LOOP) 1860 mcr &= ~UART_MCR_LOOP; 1861 1862 mos7720_port->shadowMCR = mcr; 1863 write_mos_reg(port->serial, port->number - port->serial->minor, 1864 MCR, mos7720_port->shadowMCR); 1865 1866 return 0; 1867 } 1868 1869 static int mos7720_get_icount(struct tty_struct *tty, 1870 struct serial_icounter_struct *icount) 1871 { 1872 struct usb_serial_port *port = tty->driver_data; 1873 struct moschip_port *mos7720_port; 1874 struct async_icount cnow; 1875 1876 mos7720_port = usb_get_serial_port_data(port); 1877 cnow = mos7720_port->icount; 1878 1879 icount->cts = cnow.cts; 1880 icount->dsr = cnow.dsr; 1881 icount->rng = cnow.rng; 1882 icount->dcd = cnow.dcd; 1883 icount->rx = cnow.rx; 1884 icount->tx = cnow.tx; 1885 icount->frame = cnow.frame; 1886 icount->overrun = cnow.overrun; 1887 icount->parity = cnow.parity; 1888 icount->brk = cnow.brk; 1889 icount->buf_overrun = cnow.buf_overrun; 1890 1891 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, 1892 port->number, icount->rx, icount->tx); 1893 return 0; 1894 } 1895 1896 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1897 unsigned int __user *value) 1898 { 1899 unsigned int mcr; 1900 unsigned int arg; 1901 1902 struct usb_serial_port *port; 1903 1904 if (mos7720_port == NULL) 1905 return -1; 1906 1907 port = (struct usb_serial_port *)mos7720_port->port; 1908 mcr = mos7720_port->shadowMCR; 1909 1910 if (copy_from_user(&arg, value, sizeof(int))) 1911 return -EFAULT; 1912 1913 switch (cmd) { 1914 case TIOCMBIS: 1915 if (arg & TIOCM_RTS) 1916 mcr |= UART_MCR_RTS; 1917 if (arg & TIOCM_DTR) 1918 mcr |= UART_MCR_RTS; 1919 if (arg & TIOCM_LOOP) 1920 mcr |= UART_MCR_LOOP; 1921 break; 1922 1923 case TIOCMBIC: 1924 if (arg & TIOCM_RTS) 1925 mcr &= ~UART_MCR_RTS; 1926 if (arg & TIOCM_DTR) 1927 mcr &= ~UART_MCR_RTS; 1928 if (arg & TIOCM_LOOP) 1929 mcr &= ~UART_MCR_LOOP; 1930 break; 1931 1932 } 1933 1934 mos7720_port->shadowMCR = mcr; 1935 write_mos_reg(port->serial, port->number - port->serial->minor, 1936 MCR, mos7720_port->shadowMCR); 1937 1938 return 0; 1939 } 1940 1941 static int get_serial_info(struct moschip_port *mos7720_port, 1942 struct serial_struct __user *retinfo) 1943 { 1944 struct serial_struct tmp; 1945 1946 if (!retinfo) 1947 return -EFAULT; 1948 1949 memset(&tmp, 0, sizeof(tmp)); 1950 1951 tmp.type = PORT_16550A; 1952 tmp.line = mos7720_port->port->serial->minor; 1953 tmp.port = mos7720_port->port->number; 1954 tmp.irq = 0; 1955 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1956 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1957 tmp.baud_base = 9600; 1958 tmp.close_delay = 5*HZ; 1959 tmp.closing_wait = 30*HZ; 1960 1961 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1962 return -EFAULT; 1963 return 0; 1964 } 1965 1966 static int mos7720_ioctl(struct tty_struct *tty, 1967 unsigned int cmd, unsigned long arg) 1968 { 1969 struct usb_serial_port *port = tty->driver_data; 1970 struct moschip_port *mos7720_port; 1971 struct async_icount cnow; 1972 struct async_icount cprev; 1973 1974 mos7720_port = usb_get_serial_port_data(port); 1975 if (mos7720_port == NULL) 1976 return -ENODEV; 1977 1978 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); 1979 1980 switch (cmd) { 1981 case TIOCSERGETLSR: 1982 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number); 1983 return get_lsr_info(tty, mos7720_port, 1984 (unsigned int __user *)arg); 1985 1986 /* FIXME: These should be using the mode methods */ 1987 case TIOCMBIS: 1988 case TIOCMBIC: 1989 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", 1990 __func__, port->number); 1991 return set_modem_info(mos7720_port, cmd, 1992 (unsigned int __user *)arg); 1993 1994 case TIOCGSERIAL: 1995 dbg("%s (%d) TIOCGSERIAL", __func__, port->number); 1996 return get_serial_info(mos7720_port, 1997 (struct serial_struct __user *)arg); 1998 1999 case TIOCMIWAIT: 2000 dbg("%s (%d) TIOCMIWAIT", __func__, port->number); 2001 cprev = mos7720_port->icount; 2002 while (1) { 2003 if (signal_pending(current)) 2004 return -ERESTARTSYS; 2005 cnow = mos7720_port->icount; 2006 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 2007 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 2008 return -EIO; /* no change => error */ 2009 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 2010 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 2011 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 2012 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 2013 return 0; 2014 } 2015 cprev = cnow; 2016 } 2017 /* NOTREACHED */ 2018 break; 2019 } 2020 2021 return -ENOIOCTLCMD; 2022 } 2023 2024 static int mos7720_startup(struct usb_serial *serial) 2025 { 2026 struct moschip_port *mos7720_port; 2027 struct usb_device *dev; 2028 int i; 2029 char data; 2030 u16 product; 2031 int ret_val; 2032 2033 dbg("%s: Entering ..........", __func__); 2034 2035 if (!serial) { 2036 dbg("Invalid Handler"); 2037 return -ENODEV; 2038 } 2039 2040 product = le16_to_cpu(serial->dev->descriptor.idProduct); 2041 dev = serial->dev; 2042 2043 /* 2044 * The 7715 uses the first bulk in/out endpoint pair for the parallel 2045 * port, and the second for the serial port. Because the usbserial core 2046 * assumes both pairs are serial ports, we must engage in a bit of 2047 * subterfuge and swap the pointers for ports 0 and 1 in order to make 2048 * port 0 point to the serial port. However, both moschip devices use a 2049 * single interrupt-in endpoint for both ports (as mentioned a little 2050 * further down), and this endpoint was assigned to port 0. So after 2051 * the swap, we must copy the interrupt endpoint elements from port 1 2052 * (as newly assigned) to port 0, and null out port 1 pointers. 2053 */ 2054 if (product == MOSCHIP_DEVICE_ID_7715) { 2055 struct usb_serial_port *tmp = serial->port[0]; 2056 serial->port[0] = serial->port[1]; 2057 serial->port[1] = tmp; 2058 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 2059 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 2060 serial->port[0]->interrupt_in_endpointAddress = 2061 tmp->interrupt_in_endpointAddress; 2062 serial->port[1]->interrupt_in_urb = NULL; 2063 serial->port[1]->interrupt_in_buffer = NULL; 2064 } 2065 2066 2067 /* set up serial port private structures */ 2068 for (i = 0; i < serial->num_ports; ++i) { 2069 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2070 if (mos7720_port == NULL) { 2071 dev_err(&dev->dev, "%s - Out of memory\n", __func__); 2072 return -ENOMEM; 2073 } 2074 2075 /* Initialize all port interrupt end point to port 0 int 2076 * endpoint. Our device has only one interrupt endpoint 2077 * common to all ports */ 2078 serial->port[i]->interrupt_in_endpointAddress = 2079 serial->port[0]->interrupt_in_endpointAddress; 2080 2081 mos7720_port->port = serial->port[i]; 2082 usb_set_serial_port_data(serial->port[i], mos7720_port); 2083 2084 dbg("port number is %d", serial->port[i]->number); 2085 dbg("serial number is %d", serial->minor); 2086 } 2087 2088 2089 /* setting configuration feature to one */ 2090 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2091 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 2092 2093 /* start the interrupt urb */ 2094 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 2095 if (ret_val) 2096 dev_err(&dev->dev, 2097 "%s - Error %d submitting control urb\n", 2098 __func__, ret_val); 2099 2100 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2101 if (product == MOSCHIP_DEVICE_ID_7715) { 2102 ret_val = mos7715_parport_init(serial); 2103 if (ret_val < 0) 2104 return ret_val; 2105 } 2106 #endif 2107 /* LSR For Port 1 */ 2108 read_mos_reg(serial, 0, LSR, &data); 2109 dbg("LSR:%x", data); 2110 2111 return 0; 2112 } 2113 2114 static void mos7720_release(struct usb_serial *serial) 2115 { 2116 int i; 2117 2118 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2119 /* close the parallel port */ 2120 2121 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2122 == MOSCHIP_DEVICE_ID_7715) { 2123 struct urbtracker *urbtrack; 2124 unsigned long flags; 2125 struct mos7715_parport *mos_parport = 2126 usb_get_serial_data(serial); 2127 2128 /* prevent NULL ptr dereference in port callbacks */ 2129 spin_lock(&release_lock); 2130 mos_parport->pp->private_data = NULL; 2131 spin_unlock(&release_lock); 2132 2133 /* wait for synchronous usb calls to return */ 2134 if (mos_parport->msg_pending) 2135 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2136 MOS_WDR_TIMEOUT); 2137 2138 parport_remove_port(mos_parport->pp); 2139 usb_set_serial_data(serial, NULL); 2140 mos_parport->serial = NULL; 2141 2142 /* if tasklet currently scheduled, wait for it to complete */ 2143 tasklet_kill(&mos_parport->urb_tasklet); 2144 2145 /* unlink any urbs sent by the tasklet */ 2146 spin_lock_irqsave(&mos_parport->listlock, flags); 2147 list_for_each_entry(urbtrack, 2148 &mos_parport->active_urbs, 2149 urblist_entry) 2150 usb_unlink_urb(urbtrack->urb); 2151 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2152 2153 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2154 } 2155 #endif 2156 /* free private structure allocated for serial port */ 2157 for (i = 0; i < serial->num_ports; ++i) 2158 kfree(usb_get_serial_port_data(serial->port[i])); 2159 } 2160 2161 static struct usb_serial_driver moschip7720_2port_driver = { 2162 .driver = { 2163 .owner = THIS_MODULE, 2164 .name = "moschip7720", 2165 }, 2166 .description = "Moschip 2 port adapter", 2167 .id_table = id_table, 2168 .calc_num_ports = mos77xx_calc_num_ports, 2169 .open = mos7720_open, 2170 .close = mos7720_close, 2171 .throttle = mos7720_throttle, 2172 .unthrottle = mos7720_unthrottle, 2173 .probe = mos77xx_probe, 2174 .attach = mos7720_startup, 2175 .release = mos7720_release, 2176 .ioctl = mos7720_ioctl, 2177 .tiocmget = mos7720_tiocmget, 2178 .tiocmset = mos7720_tiocmset, 2179 .get_icount = mos7720_get_icount, 2180 .set_termios = mos7720_set_termios, 2181 .write = mos7720_write, 2182 .write_room = mos7720_write_room, 2183 .chars_in_buffer = mos7720_chars_in_buffer, 2184 .break_ctl = mos7720_break, 2185 .read_bulk_callback = mos7720_bulk_in_callback, 2186 .read_int_callback = NULL /* dynamically assigned in probe() */ 2187 }; 2188 2189 static struct usb_serial_driver * const serial_drivers[] = { 2190 &moschip7720_2port_driver, NULL 2191 }; 2192 2193 module_usb_serial_driver(serial_drivers, id_table); 2194 2195 MODULE_AUTHOR(DRIVER_AUTHOR); 2196 MODULE_DESCRIPTION(DRIVER_DESC); 2197 MODULE_LICENSE("GPL"); 2198 2199 module_param(debug, bool, S_IRUGO | S_IWUSR); 2200 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2201