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 struct usb_serial_driver moschip7720_2port_driver; 75 76 #define USB_VENDOR_ID_MOSCHIP 0x9710 77 #define MOSCHIP_DEVICE_ID_7720 0x7720 78 #define MOSCHIP_DEVICE_ID_7715 0x7715 79 80 static const struct usb_device_id id_table[] = { 81 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 82 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 83 { } /* terminating entry */ 84 }; 85 MODULE_DEVICE_TABLE(usb, id_table); 86 87 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 88 89 /* initial values for parport regs */ 90 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 91 #define ECR_INIT_VAL 0x00 /* SPP mode */ 92 93 struct urbtracker { 94 struct mos7715_parport *mos_parport; 95 struct list_head urblist_entry; 96 struct kref ref_count; 97 struct urb *urb; 98 }; 99 100 enum mos7715_pp_modes { 101 SPP = 0<<5, 102 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 103 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 104 }; 105 106 struct mos7715_parport { 107 struct parport *pp; /* back to containing struct */ 108 struct kref ref_count; /* to instance of this struct */ 109 struct list_head deferred_urbs; /* list deferred async urbs */ 110 struct list_head active_urbs; /* list async urbs in flight */ 111 spinlock_t listlock; /* protects list access */ 112 bool msg_pending; /* usb sync call pending */ 113 struct completion syncmsg_compl; /* usb sync call completed */ 114 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 115 struct usb_serial *serial; /* back to containing struct */ 116 __u8 shadowECR; /* parallel port regs... */ 117 __u8 shadowDCR; 118 atomic_t shadowDSR; /* updated in int-in callback */ 119 }; 120 121 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 122 static DEFINE_SPINLOCK(release_lock); 123 124 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 125 126 static const unsigned int dummy; /* for clarity in register access fns */ 127 128 enum mos_regs { 129 THR, /* serial port regs */ 130 RHR, 131 IER, 132 FCR, 133 ISR, 134 LCR, 135 MCR, 136 LSR, 137 MSR, 138 SPR, 139 DLL, 140 DLM, 141 DPR, /* parallel port regs */ 142 DSR, 143 DCR, 144 ECR, 145 SP1_REG, /* device control regs */ 146 SP2_REG, /* serial port 2 (7720 only) */ 147 PP_REG, 148 SP_CONTROL_REG, 149 }; 150 151 /* 152 * Return the correct value for the Windex field of the setup packet 153 * for a control endpoint message. See the 7715 datasheet. 154 */ 155 static inline __u16 get_reg_index(enum mos_regs reg) 156 { 157 static const __u16 mos7715_index_lookup_table[] = { 158 0x00, /* THR */ 159 0x00, /* RHR */ 160 0x01, /* IER */ 161 0x02, /* FCR */ 162 0x02, /* ISR */ 163 0x03, /* LCR */ 164 0x04, /* MCR */ 165 0x05, /* LSR */ 166 0x06, /* MSR */ 167 0x07, /* SPR */ 168 0x00, /* DLL */ 169 0x01, /* DLM */ 170 0x00, /* DPR */ 171 0x01, /* DSR */ 172 0x02, /* DCR */ 173 0x0a, /* ECR */ 174 0x01, /* SP1_REG */ 175 0x02, /* SP2_REG (7720 only) */ 176 0x04, /* PP_REG (7715 only) */ 177 0x08, /* SP_CONTROL_REG */ 178 }; 179 return mos7715_index_lookup_table[reg]; 180 } 181 182 /* 183 * Return the correct value for the upper byte of the Wvalue field of 184 * the setup packet for a control endpoint message. 185 */ 186 static inline __u16 get_reg_value(enum mos_regs reg, 187 unsigned int serial_portnum) 188 { 189 if (reg >= SP1_REG) /* control reg */ 190 return 0x0000; 191 192 else if (reg >= DPR) /* parallel port reg (7715 only) */ 193 return 0x0100; 194 195 else /* serial port reg */ 196 return (serial_portnum + 2) << 8; 197 } 198 199 /* 200 * Write data byte to the specified device register. The data is embedded in 201 * the value field of the setup packet. serial_portnum is ignored for registers 202 * not specific to a particular serial port. 203 */ 204 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 205 enum mos_regs reg, __u8 data) 206 { 207 struct usb_device *usbdev = serial->dev; 208 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 209 __u8 request = (__u8)0x0e; 210 __u8 requesttype = (__u8)0x40; 211 __u16 index = get_reg_index(reg); 212 __u16 value = get_reg_value(reg, serial_portnum) + data; 213 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 214 index, NULL, 0, MOS_WDR_TIMEOUT); 215 if (status < 0) 216 dev_err(&usbdev->dev, 217 "mos7720: usb_control_msg() failed: %d", status); 218 return status; 219 } 220 221 /* 222 * Read data byte from the specified device register. The data returned by the 223 * device is embedded in the value field of the setup packet. serial_portnum is 224 * ignored for registers that are not specific to a particular serial port. 225 */ 226 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 227 enum mos_regs reg, __u8 *data) 228 { 229 struct usb_device *usbdev = serial->dev; 230 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 231 __u8 request = (__u8)0x0d; 232 __u8 requesttype = (__u8)0xc0; 233 __u16 index = get_reg_index(reg); 234 __u16 value = get_reg_value(reg, serial_portnum); 235 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 236 index, data, 1, MOS_WDR_TIMEOUT); 237 if (status < 0) 238 dev_err(&usbdev->dev, 239 "mos7720: usb_control_msg() failed: %d", status); 240 return status; 241 } 242 243 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 244 245 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 246 enum mos7715_pp_modes mode) 247 { 248 mos_parport->shadowECR = mode; 249 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 250 return 0; 251 } 252 253 static void destroy_mos_parport(struct kref *kref) 254 { 255 struct mos7715_parport *mos_parport = 256 container_of(kref, struct mos7715_parport, ref_count); 257 258 kfree(mos_parport); 259 } 260 261 static void destroy_urbtracker(struct kref *kref) 262 { 263 struct urbtracker *urbtrack = 264 container_of(kref, struct urbtracker, ref_count); 265 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 266 267 usb_free_urb(urbtrack->urb); 268 kfree(urbtrack); 269 kref_put(&mos_parport->ref_count, destroy_mos_parport); 270 } 271 272 /* 273 * This runs as a tasklet when sending an urb in a non-blocking parallel 274 * port callback had to be deferred because the disconnect mutex could not be 275 * obtained at the time. 276 */ 277 static void send_deferred_urbs(unsigned long _mos_parport) 278 { 279 int ret_val; 280 unsigned long flags; 281 struct mos7715_parport *mos_parport = (void *)_mos_parport; 282 struct urbtracker *urbtrack, *tmp; 283 struct list_head *cursor, *next; 284 struct device *dev; 285 286 /* if release function ran, game over */ 287 if (unlikely(mos_parport->serial == NULL)) 288 return; 289 290 dev = &mos_parport->serial->dev->dev; 291 292 /* try again to get the mutex */ 293 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 294 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 295 tasklet_schedule(&mos_parport->urb_tasklet); 296 return; 297 } 298 299 /* if device disconnected, game over */ 300 if (unlikely(mos_parport->serial->disconnected)) { 301 mutex_unlock(&mos_parport->serial->disc_mutex); 302 return; 303 } 304 305 spin_lock_irqsave(&mos_parport->listlock, flags); 306 if (list_empty(&mos_parport->deferred_urbs)) { 307 spin_unlock_irqrestore(&mos_parport->listlock, flags); 308 mutex_unlock(&mos_parport->serial->disc_mutex); 309 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 310 return; 311 } 312 313 /* move contents of deferred_urbs list to active_urbs list and submit */ 314 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 315 list_move_tail(cursor, &mos_parport->active_urbs); 316 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 317 urblist_entry) { 318 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 319 dev_dbg(dev, "%s: urb submitted\n", __func__); 320 if (ret_val) { 321 dev_err(dev, "usb_submit_urb() failed: %d\n", 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 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __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 dev_dbg(&usbdev->dev, "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 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__); 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 struct device *dev = &urb->dev->dev; 747 __u8 *data; 748 __u8 sp1; 749 __u8 sp2; 750 751 switch (status) { 752 case 0: 753 /* success */ 754 break; 755 case -ECONNRESET: 756 case -ENOENT: 757 case -ESHUTDOWN: 758 /* this urb is terminated, clean up */ 759 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 760 return; 761 default: 762 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 763 goto exit; 764 } 765 766 length = urb->actual_length; 767 data = urb->transfer_buffer; 768 769 /* Moschip get 4 bytes 770 * Byte 1 IIR Port 1 (port.number is 0) 771 * Byte 2 IIR Port 2 (port.number is 1) 772 * Byte 3 -------------- 773 * Byte 4 FIFO status for both */ 774 775 /* the above description is inverted 776 * oneukum 2007-03-14 */ 777 778 if (unlikely(length != 4)) { 779 dev_dbg(dev, "Wrong data !!!\n"); 780 return; 781 } 782 783 sp1 = data[3]; 784 sp2 = data[2]; 785 786 if ((sp1 | sp2) & 0x01) { 787 /* No Interrupt Pending in both the ports */ 788 dev_dbg(dev, "No Interrupt !!!\n"); 789 } else { 790 switch (sp1 & 0x0f) { 791 case SERIAL_IIR_RLS: 792 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 793 break; 794 case SERIAL_IIR_CTI: 795 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 796 break; 797 case SERIAL_IIR_MS: 798 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 799 break; 800 } 801 802 switch (sp2 & 0x0f) { 803 case SERIAL_IIR_RLS: 804 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 805 break; 806 case SERIAL_IIR_CTI: 807 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 808 break; 809 case SERIAL_IIR_MS: 810 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 811 break; 812 } 813 } 814 815 exit: 816 result = usb_submit_urb(urb, GFP_ATOMIC); 817 if (result) 818 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 819 } 820 821 /* 822 * mos7715_interrupt_callback 823 * this is the 7715's callback function for when we have received data on 824 * the interrupt endpoint. 825 */ 826 static void mos7715_interrupt_callback(struct urb *urb) 827 { 828 int result; 829 int length; 830 int status = urb->status; 831 struct device *dev = &urb->dev->dev; 832 __u8 *data; 833 __u8 iir; 834 835 switch (status) { 836 case 0: 837 /* success */ 838 break; 839 case -ECONNRESET: 840 case -ENOENT: 841 case -ESHUTDOWN: 842 case -ENODEV: 843 /* this urb is terminated, clean up */ 844 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 845 return; 846 default: 847 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 848 goto exit; 849 } 850 851 length = urb->actual_length; 852 data = urb->transfer_buffer; 853 854 /* Structure of data from 7715 device: 855 * Byte 1: IIR serial Port 856 * Byte 2: unused 857 * Byte 2: DSR parallel port 858 * Byte 4: FIFO status for both */ 859 860 if (unlikely(length != 4)) { 861 dev_dbg(dev, "Wrong data !!!\n"); 862 return; 863 } 864 865 iir = data[0]; 866 if (!(iir & 0x01)) { /* serial port interrupt pending */ 867 switch (iir & 0x0f) { 868 case SERIAL_IIR_RLS: 869 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n"); 870 break; 871 case SERIAL_IIR_CTI: 872 dev_dbg(dev, "Serial Port: Receiver time out\n"); 873 break; 874 case SERIAL_IIR_MS: 875 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 876 break; 877 } 878 } 879 880 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 881 { /* update local copy of DSR reg */ 882 struct usb_serial_port *port = urb->context; 883 struct mos7715_parport *mos_parport = port->serial->private; 884 if (unlikely(mos_parport == NULL)) 885 return; 886 atomic_set(&mos_parport->shadowDSR, data[2]); 887 } 888 #endif 889 890 exit: 891 result = usb_submit_urb(urb, GFP_ATOMIC); 892 if (result) 893 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 894 } 895 896 /* 897 * mos7720_bulk_in_callback 898 * this is the callback function for when we have received data on the 899 * bulk in endpoint. 900 */ 901 static void mos7720_bulk_in_callback(struct urb *urb) 902 { 903 int retval; 904 unsigned char *data ; 905 struct usb_serial_port *port; 906 struct tty_struct *tty; 907 int status = urb->status; 908 909 if (status) { 910 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 911 return; 912 } 913 914 port = urb->context; 915 916 dev_dbg(&port->dev, "Entering...%s\n", __func__); 917 918 data = urb->transfer_buffer; 919 920 tty = tty_port_tty_get(&port->port); 921 if (tty && urb->actual_length) { 922 tty_insert_flip_string(tty, data, urb->actual_length); 923 tty_flip_buffer_push(tty); 924 } 925 tty_kref_put(tty); 926 927 if (port->read_urb->status != -EINPROGRESS) { 928 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 929 if (retval) 930 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 931 } 932 } 933 934 /* 935 * mos7720_bulk_out_data_callback 936 * this is the callback function for when we have finished sending serial 937 * data on the bulk out endpoint. 938 */ 939 static void mos7720_bulk_out_data_callback(struct urb *urb) 940 { 941 struct moschip_port *mos7720_port; 942 struct tty_struct *tty; 943 int status = urb->status; 944 945 if (status) { 946 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 947 return; 948 } 949 950 mos7720_port = urb->context; 951 if (!mos7720_port) { 952 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 953 return ; 954 } 955 956 tty = tty_port_tty_get(&mos7720_port->port->port); 957 958 if (tty && mos7720_port->open) 959 tty_wakeup(tty); 960 tty_kref_put(tty); 961 } 962 963 /* 964 * mos77xx_probe 965 * this function installs the appropriate read interrupt endpoint callback 966 * depending on whether the device is a 7720 or 7715, thus avoiding costly 967 * run-time checks in the high-frequency callback routine itself. 968 */ 969 static int mos77xx_probe(struct usb_serial *serial, 970 const struct usb_device_id *id) 971 { 972 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 973 moschip7720_2port_driver.read_int_callback = 974 mos7715_interrupt_callback; 975 else 976 moschip7720_2port_driver.read_int_callback = 977 mos7720_interrupt_callback; 978 979 return 0; 980 } 981 982 static int mos77xx_calc_num_ports(struct usb_serial *serial) 983 { 984 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 985 if (product == MOSCHIP_DEVICE_ID_7715) 986 return 1; 987 988 return 2; 989 } 990 991 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 992 { 993 struct usb_serial *serial; 994 struct urb *urb; 995 struct moschip_port *mos7720_port; 996 int response; 997 int port_number; 998 __u8 data; 999 int allocated_urbs = 0; 1000 int j; 1001 1002 serial = port->serial; 1003 1004 mos7720_port = usb_get_serial_port_data(port); 1005 if (mos7720_port == NULL) 1006 return -ENODEV; 1007 1008 usb_clear_halt(serial->dev, port->write_urb->pipe); 1009 usb_clear_halt(serial->dev, port->read_urb->pipe); 1010 1011 /* Initialising the write urb pool */ 1012 for (j = 0; j < NUM_URBS; ++j) { 1013 urb = usb_alloc_urb(0, GFP_KERNEL); 1014 mos7720_port->write_urb_pool[j] = urb; 1015 1016 if (urb == NULL) { 1017 dev_err(&port->dev, "No more urbs???\n"); 1018 continue; 1019 } 1020 1021 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1022 GFP_KERNEL); 1023 if (!urb->transfer_buffer) { 1024 dev_err(&port->dev, 1025 "%s-out of memory for urb buffers.\n", 1026 __func__); 1027 usb_free_urb(mos7720_port->write_urb_pool[j]); 1028 mos7720_port->write_urb_pool[j] = NULL; 1029 continue; 1030 } 1031 allocated_urbs++; 1032 } 1033 1034 if (!allocated_urbs) 1035 return -ENOMEM; 1036 1037 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1038 * 1039 * Register Index 1040 * 0 : THR/RHR 1041 * 1 : IER 1042 * 2 : FCR 1043 * 3 : LCR 1044 * 4 : MCR 1045 * 5 : LSR 1046 * 6 : MSR 1047 * 7 : SPR 1048 * 1049 * 0x08 : SP1/2 Control Reg 1050 */ 1051 port_number = port->number - port->serial->minor; 1052 read_mos_reg(serial, port_number, LSR, &data); 1053 1054 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1055 1056 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1057 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1058 1059 write_mos_reg(serial, port_number, IER, 0x00); 1060 write_mos_reg(serial, port_number, FCR, 0x00); 1061 1062 write_mos_reg(serial, port_number, FCR, 0xcf); 1063 mos7720_port->shadowLCR = 0x03; 1064 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1065 mos7720_port->shadowMCR = 0x0b; 1066 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1067 1068 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1069 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1070 data = data | (port->number - port->serial->minor + 1); 1071 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1072 mos7720_port->shadowLCR = 0x83; 1073 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1074 write_mos_reg(serial, port_number, THR, 0x0c); 1075 write_mos_reg(serial, port_number, IER, 0x00); 1076 mos7720_port->shadowLCR = 0x03; 1077 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1078 write_mos_reg(serial, port_number, IER, 0x0c); 1079 1080 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1081 if (response) 1082 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1083 __func__, response); 1084 1085 /* initialize our icount structure */ 1086 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1087 1088 /* initialize our port settings */ 1089 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1090 1091 /* send a open port command */ 1092 mos7720_port->open = 1; 1093 1094 return 0; 1095 } 1096 1097 /* 1098 * mos7720_chars_in_buffer 1099 * this function is called by the tty driver when it wants to know how many 1100 * bytes of data we currently have outstanding in the port (data that has 1101 * been written, but hasn't made it out the port yet) 1102 * If successful, we return the number of bytes left to be written in the 1103 * system, 1104 * Otherwise we return a negative error number. 1105 */ 1106 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1107 { 1108 struct usb_serial_port *port = tty->driver_data; 1109 int i; 1110 int chars = 0; 1111 struct moschip_port *mos7720_port; 1112 1113 mos7720_port = usb_get_serial_port_data(port); 1114 if (mos7720_port == NULL) 1115 return 0; 1116 1117 for (i = 0; i < NUM_URBS; ++i) { 1118 if (mos7720_port->write_urb_pool[i] && 1119 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1120 chars += URB_TRANSFER_BUFFER_SIZE; 1121 } 1122 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1123 return chars; 1124 } 1125 1126 static void mos7720_close(struct usb_serial_port *port) 1127 { 1128 struct usb_serial *serial; 1129 struct moschip_port *mos7720_port; 1130 int j; 1131 1132 serial = port->serial; 1133 1134 mos7720_port = usb_get_serial_port_data(port); 1135 if (mos7720_port == NULL) 1136 return; 1137 1138 for (j = 0; j < NUM_URBS; ++j) 1139 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1140 1141 /* Freeing Write URBs */ 1142 for (j = 0; j < NUM_URBS; ++j) { 1143 if (mos7720_port->write_urb_pool[j]) { 1144 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1145 usb_free_urb(mos7720_port->write_urb_pool[j]); 1146 } 1147 } 1148 1149 /* While closing port, shutdown all bulk read, write * 1150 * and interrupt read if they exists, otherwise nop */ 1151 usb_kill_urb(port->write_urb); 1152 usb_kill_urb(port->read_urb); 1153 1154 mutex_lock(&serial->disc_mutex); 1155 /* these commands must not be issued if the device has 1156 * been disconnected */ 1157 if (!serial->disconnected) { 1158 write_mos_reg(serial, port->number - port->serial->minor, 1159 MCR, 0x00); 1160 write_mos_reg(serial, port->number - port->serial->minor, 1161 IER, 0x00); 1162 } 1163 mutex_unlock(&serial->disc_mutex); 1164 mos7720_port->open = 0; 1165 } 1166 1167 static void mos7720_break(struct tty_struct *tty, int break_state) 1168 { 1169 struct usb_serial_port *port = tty->driver_data; 1170 unsigned char data; 1171 struct usb_serial *serial; 1172 struct moschip_port *mos7720_port; 1173 1174 serial = port->serial; 1175 1176 mos7720_port = usb_get_serial_port_data(port); 1177 if (mos7720_port == NULL) 1178 return; 1179 1180 if (break_state == -1) 1181 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1182 else 1183 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1184 1185 mos7720_port->shadowLCR = data; 1186 write_mos_reg(serial, port->number - port->serial->minor, 1187 LCR, mos7720_port->shadowLCR); 1188 } 1189 1190 /* 1191 * mos7720_write_room 1192 * this function is called by the tty driver when it wants to know how many 1193 * bytes of data we can accept for a specific port. 1194 * If successful, we return the amount of room that we have for this port 1195 * Otherwise we return a negative error number. 1196 */ 1197 static int mos7720_write_room(struct tty_struct *tty) 1198 { 1199 struct usb_serial_port *port = tty->driver_data; 1200 struct moschip_port *mos7720_port; 1201 int room = 0; 1202 int i; 1203 1204 mos7720_port = usb_get_serial_port_data(port); 1205 if (mos7720_port == NULL) 1206 return -ENODEV; 1207 1208 /* FIXME: Locking */ 1209 for (i = 0; i < NUM_URBS; ++i) { 1210 if (mos7720_port->write_urb_pool[i] && 1211 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1212 room += URB_TRANSFER_BUFFER_SIZE; 1213 } 1214 1215 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1216 return room; 1217 } 1218 1219 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1220 const unsigned char *data, int count) 1221 { 1222 int status; 1223 int i; 1224 int bytes_sent = 0; 1225 int transfer_size; 1226 1227 struct moschip_port *mos7720_port; 1228 struct usb_serial *serial; 1229 struct urb *urb; 1230 const unsigned char *current_position = data; 1231 1232 serial = port->serial; 1233 1234 mos7720_port = usb_get_serial_port_data(port); 1235 if (mos7720_port == NULL) 1236 return -ENODEV; 1237 1238 /* try to find a free urb in the list */ 1239 urb = NULL; 1240 1241 for (i = 0; i < NUM_URBS; ++i) { 1242 if (mos7720_port->write_urb_pool[i] && 1243 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1244 urb = mos7720_port->write_urb_pool[i]; 1245 dev_dbg(&port->dev, "URB:%d\n", i); 1246 break; 1247 } 1248 } 1249 1250 if (urb == NULL) { 1251 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1252 goto exit; 1253 } 1254 1255 if (urb->transfer_buffer == NULL) { 1256 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1257 GFP_KERNEL); 1258 if (urb->transfer_buffer == NULL) { 1259 dev_err_console(port, "%s no more kernel memory...\n", 1260 __func__); 1261 goto exit; 1262 } 1263 } 1264 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1265 1266 memcpy(urb->transfer_buffer, current_position, transfer_size); 1267 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1268 urb->transfer_buffer); 1269 1270 /* fill urb with data and submit */ 1271 usb_fill_bulk_urb(urb, serial->dev, 1272 usb_sndbulkpipe(serial->dev, 1273 port->bulk_out_endpointAddress), 1274 urb->transfer_buffer, transfer_size, 1275 mos7720_bulk_out_data_callback, mos7720_port); 1276 1277 /* send it down the pipe */ 1278 status = usb_submit_urb(urb, GFP_ATOMIC); 1279 if (status) { 1280 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1281 "with status = %d\n", __func__, status); 1282 bytes_sent = status; 1283 goto exit; 1284 } 1285 bytes_sent = transfer_size; 1286 1287 exit: 1288 return bytes_sent; 1289 } 1290 1291 static void mos7720_throttle(struct tty_struct *tty) 1292 { 1293 struct usb_serial_port *port = tty->driver_data; 1294 struct moschip_port *mos7720_port; 1295 int status; 1296 1297 mos7720_port = usb_get_serial_port_data(port); 1298 1299 if (mos7720_port == NULL) 1300 return; 1301 1302 if (!mos7720_port->open) { 1303 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1304 return; 1305 } 1306 1307 /* if we are implementing XON/XOFF, send the stop character */ 1308 if (I_IXOFF(tty)) { 1309 unsigned char stop_char = STOP_CHAR(tty); 1310 status = mos7720_write(tty, port, &stop_char, 1); 1311 if (status <= 0) 1312 return; 1313 } 1314 1315 /* if we are implementing RTS/CTS, toggle that line */ 1316 if (tty->termios.c_cflag & CRTSCTS) { 1317 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1318 write_mos_reg(port->serial, port->number - port->serial->minor, 1319 MCR, mos7720_port->shadowMCR); 1320 if (status != 0) 1321 return; 1322 } 1323 } 1324 1325 static void mos7720_unthrottle(struct tty_struct *tty) 1326 { 1327 struct usb_serial_port *port = tty->driver_data; 1328 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1329 int status; 1330 1331 if (mos7720_port == NULL) 1332 return; 1333 1334 if (!mos7720_port->open) { 1335 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1336 return; 1337 } 1338 1339 /* if we are implementing XON/XOFF, send the start character */ 1340 if (I_IXOFF(tty)) { 1341 unsigned char start_char = START_CHAR(tty); 1342 status = mos7720_write(tty, port, &start_char, 1); 1343 if (status <= 0) 1344 return; 1345 } 1346 1347 /* if we are implementing RTS/CTS, toggle that line */ 1348 if (tty->termios.c_cflag & CRTSCTS) { 1349 mos7720_port->shadowMCR |= UART_MCR_RTS; 1350 write_mos_reg(port->serial, port->number - port->serial->minor, 1351 MCR, mos7720_port->shadowMCR); 1352 if (status != 0) 1353 return; 1354 } 1355 } 1356 1357 /* FIXME: this function does not work */ 1358 static int set_higher_rates(struct moschip_port *mos7720_port, 1359 unsigned int baud) 1360 { 1361 struct usb_serial_port *port; 1362 struct usb_serial *serial; 1363 int port_number; 1364 enum mos_regs sp_reg; 1365 if (mos7720_port == NULL) 1366 return -EINVAL; 1367 1368 port = mos7720_port->port; 1369 serial = port->serial; 1370 1371 /*********************************************** 1372 * Init Sequence for higher rates 1373 ***********************************************/ 1374 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1375 port_number = port->number - port->serial->minor; 1376 1377 write_mos_reg(serial, port_number, IER, 0x00); 1378 write_mos_reg(serial, port_number, FCR, 0x00); 1379 write_mos_reg(serial, port_number, FCR, 0xcf); 1380 mos7720_port->shadowMCR = 0x0b; 1381 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1382 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1383 1384 /*********************************************** 1385 * Set for higher rates * 1386 ***********************************************/ 1387 /* writing baud rate verbatum into uart clock field clearly not right */ 1388 if (port_number == 0) 1389 sp_reg = SP1_REG; 1390 else 1391 sp_reg = SP2_REG; 1392 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1393 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1394 mos7720_port->shadowMCR = 0x2b; 1395 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1396 1397 /*********************************************** 1398 * Set DLL/DLM 1399 ***********************************************/ 1400 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1401 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1402 write_mos_reg(serial, port_number, DLL, 0x01); 1403 write_mos_reg(serial, port_number, DLM, 0x00); 1404 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1405 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1406 1407 return 0; 1408 } 1409 1410 /* baud rate information */ 1411 struct divisor_table_entry { 1412 __u32 baudrate; 1413 __u16 divisor; 1414 }; 1415 1416 /* Define table of divisors for moschip 7720 hardware * 1417 * These assume a 3.6864MHz crystal, the standard /16, and * 1418 * MCR.7 = 0. */ 1419 static struct divisor_table_entry divisor_table[] = { 1420 { 50, 2304}, 1421 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1422 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1423 { 150, 768}, 1424 { 300, 384}, 1425 { 600, 192}, 1426 { 1200, 96}, 1427 { 1800, 64}, 1428 { 2400, 48}, 1429 { 4800, 24}, 1430 { 7200, 16}, 1431 { 9600, 12}, 1432 { 19200, 6}, 1433 { 38400, 3}, 1434 { 57600, 2}, 1435 { 115200, 1}, 1436 }; 1437 1438 /***************************************************************************** 1439 * calc_baud_rate_divisor 1440 * this function calculates the proper baud rate divisor for the specified 1441 * baud rate. 1442 *****************************************************************************/ 1443 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1444 { 1445 int i; 1446 __u16 custom; 1447 __u16 round1; 1448 __u16 round; 1449 1450 1451 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1452 1453 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1454 if (divisor_table[i].baudrate == baudrate) { 1455 *divisor = divisor_table[i].divisor; 1456 return 0; 1457 } 1458 } 1459 1460 /* After trying for all the standard baud rates * 1461 * Try calculating the divisor for this baud rate */ 1462 if (baudrate > 75 && baudrate < 230400) { 1463 /* get the divisor */ 1464 custom = (__u16)(230400L / baudrate); 1465 1466 /* Check for round off */ 1467 round1 = (__u16)(2304000L / baudrate); 1468 round = (__u16)(round1 - (custom * 10)); 1469 if (round > 4) 1470 custom++; 1471 *divisor = custom; 1472 1473 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1474 return 0; 1475 } 1476 1477 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1478 return -EINVAL; 1479 } 1480 1481 /* 1482 * send_cmd_write_baud_rate 1483 * this function sends the proper command to change the baud rate of the 1484 * specified port. 1485 */ 1486 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1487 int baudrate) 1488 { 1489 struct usb_serial_port *port; 1490 struct usb_serial *serial; 1491 int divisor; 1492 int status; 1493 unsigned char number; 1494 1495 if (mos7720_port == NULL) 1496 return -1; 1497 1498 port = mos7720_port->port; 1499 serial = port->serial; 1500 1501 number = port->number - port->serial->minor; 1502 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1503 1504 /* Calculate the Divisor */ 1505 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1506 if (status) { 1507 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1508 return status; 1509 } 1510 1511 /* Enable access to divisor latch */ 1512 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1513 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1514 1515 /* Write the divisor */ 1516 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1517 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1518 1519 /* Disable access to divisor latch */ 1520 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1521 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1522 1523 return status; 1524 } 1525 1526 /* 1527 * change_port_settings 1528 * This routine is called to set the UART on the device to match 1529 * the specified new settings. 1530 */ 1531 static void change_port_settings(struct tty_struct *tty, 1532 struct moschip_port *mos7720_port, 1533 struct ktermios *old_termios) 1534 { 1535 struct usb_serial_port *port; 1536 struct usb_serial *serial; 1537 int baud; 1538 unsigned cflag; 1539 unsigned iflag; 1540 __u8 mask = 0xff; 1541 __u8 lData; 1542 __u8 lParity; 1543 __u8 lStop; 1544 int status; 1545 int port_number; 1546 1547 if (mos7720_port == NULL) 1548 return ; 1549 1550 port = mos7720_port->port; 1551 serial = port->serial; 1552 port_number = port->number - port->serial->minor; 1553 1554 if (!mos7720_port->open) { 1555 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1556 return; 1557 } 1558 1559 lData = UART_LCR_WLEN8; 1560 lStop = 0x00; /* 1 stop bit */ 1561 lParity = 0x00; /* No parity */ 1562 1563 cflag = tty->termios.c_cflag; 1564 iflag = tty->termios.c_iflag; 1565 1566 /* Change the number of bits */ 1567 switch (cflag & CSIZE) { 1568 case CS5: 1569 lData = UART_LCR_WLEN5; 1570 mask = 0x1f; 1571 break; 1572 1573 case CS6: 1574 lData = UART_LCR_WLEN6; 1575 mask = 0x3f; 1576 break; 1577 1578 case CS7: 1579 lData = UART_LCR_WLEN7; 1580 mask = 0x7f; 1581 break; 1582 default: 1583 case CS8: 1584 lData = UART_LCR_WLEN8; 1585 break; 1586 } 1587 1588 /* Change the Parity bit */ 1589 if (cflag & PARENB) { 1590 if (cflag & PARODD) { 1591 lParity = UART_LCR_PARITY; 1592 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1593 } else { 1594 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1595 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1596 } 1597 1598 } else { 1599 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1600 } 1601 1602 if (cflag & CMSPAR) 1603 lParity = lParity | 0x20; 1604 1605 /* Change the Stop bit */ 1606 if (cflag & CSTOPB) { 1607 lStop = UART_LCR_STOP; 1608 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1609 } else { 1610 lStop = 0x00; 1611 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1612 } 1613 1614 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1615 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1616 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1617 1618 /* Update the LCR with the correct value */ 1619 mos7720_port->shadowLCR &= 1620 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1621 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1622 1623 1624 /* Disable Interrupts */ 1625 write_mos_reg(serial, port_number, IER, 0x00); 1626 write_mos_reg(serial, port_number, FCR, 0x00); 1627 write_mos_reg(serial, port_number, FCR, 0xcf); 1628 1629 /* Send the updated LCR value to the mos7720 */ 1630 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1631 mos7720_port->shadowMCR = 0x0b; 1632 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1633 1634 /* set up the MCR register and send it to the mos7720 */ 1635 mos7720_port->shadowMCR = UART_MCR_OUT2; 1636 if (cflag & CBAUD) 1637 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1638 1639 if (cflag & CRTSCTS) { 1640 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1641 /* To set hardware flow control to the specified * 1642 * serial port, in SP1/2_CONTROL_REG */ 1643 if (port->number) 1644 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1645 else 1646 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1647 1648 } else 1649 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1650 1651 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1652 1653 /* Determine divisor based on baud rate */ 1654 baud = tty_get_baud_rate(tty); 1655 if (!baud) { 1656 /* pick a default, any default... */ 1657 dev_dbg(&port->dev, "Picked default baud...\n"); 1658 baud = 9600; 1659 } 1660 1661 if (baud >= 230400) { 1662 set_higher_rates(mos7720_port, baud); 1663 /* Enable Interrupts */ 1664 write_mos_reg(serial, port_number, IER, 0x0c); 1665 return; 1666 } 1667 1668 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1669 status = send_cmd_write_baud_rate(mos7720_port, baud); 1670 /* FIXME: needs to write actual resulting baud back not just 1671 blindly do so */ 1672 if (cflag & CBAUD) 1673 tty_encode_baud_rate(tty, baud, baud); 1674 /* Enable Interrupts */ 1675 write_mos_reg(serial, port_number, IER, 0x0c); 1676 1677 if (port->read_urb->status != -EINPROGRESS) { 1678 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1679 if (status) 1680 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1681 } 1682 } 1683 1684 /* 1685 * mos7720_set_termios 1686 * this function is called by the tty driver when it wants to change the 1687 * termios structure. 1688 */ 1689 static void mos7720_set_termios(struct tty_struct *tty, 1690 struct usb_serial_port *port, struct ktermios *old_termios) 1691 { 1692 int status; 1693 unsigned int cflag; 1694 struct usb_serial *serial; 1695 struct moschip_port *mos7720_port; 1696 1697 serial = port->serial; 1698 1699 mos7720_port = usb_get_serial_port_data(port); 1700 1701 if (mos7720_port == NULL) 1702 return; 1703 1704 if (!mos7720_port->open) { 1705 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1706 return; 1707 } 1708 1709 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1710 1711 cflag = tty->termios.c_cflag; 1712 1713 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1714 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1715 1716 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1717 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1718 1719 /* change the port settings to the new ones specified */ 1720 change_port_settings(tty, mos7720_port, old_termios); 1721 1722 if (port->read_urb->status != -EINPROGRESS) { 1723 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1724 if (status) 1725 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1726 } 1727 } 1728 1729 /* 1730 * get_lsr_info - get line status register info 1731 * 1732 * Purpose: Let user call ioctl() to get info when the UART physically 1733 * is emptied. On bus types like RS485, the transmitter must 1734 * release the bus after transmitting. This must be done when 1735 * the transmit shift register is empty, not be done when the 1736 * transmit holding register is empty. This functionality 1737 * allows an RS485 driver to be written in user space. 1738 */ 1739 static int get_lsr_info(struct tty_struct *tty, 1740 struct moschip_port *mos7720_port, unsigned int __user *value) 1741 { 1742 struct usb_serial_port *port = tty->driver_data; 1743 unsigned int result = 0; 1744 unsigned char data = 0; 1745 int port_number = port->number - port->serial->minor; 1746 int count; 1747 1748 count = mos7720_chars_in_buffer(tty); 1749 if (count == 0) { 1750 read_mos_reg(port->serial, port_number, LSR, &data); 1751 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1752 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1753 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1754 result = TIOCSER_TEMT; 1755 } 1756 } 1757 if (copy_to_user(value, &result, sizeof(int))) 1758 return -EFAULT; 1759 return 0; 1760 } 1761 1762 static int mos7720_tiocmget(struct tty_struct *tty) 1763 { 1764 struct usb_serial_port *port = tty->driver_data; 1765 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1766 unsigned int result = 0; 1767 unsigned int mcr ; 1768 unsigned int msr ; 1769 1770 mcr = mos7720_port->shadowMCR; 1771 msr = mos7720_port->shadowMSR; 1772 1773 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1774 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1775 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1776 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1777 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1778 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1779 1780 return result; 1781 } 1782 1783 static int mos7720_tiocmset(struct tty_struct *tty, 1784 unsigned int set, unsigned int clear) 1785 { 1786 struct usb_serial_port *port = tty->driver_data; 1787 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1788 unsigned int mcr ; 1789 1790 mcr = mos7720_port->shadowMCR; 1791 1792 if (set & TIOCM_RTS) 1793 mcr |= UART_MCR_RTS; 1794 if (set & TIOCM_DTR) 1795 mcr |= UART_MCR_DTR; 1796 if (set & TIOCM_LOOP) 1797 mcr |= UART_MCR_LOOP; 1798 1799 if (clear & TIOCM_RTS) 1800 mcr &= ~UART_MCR_RTS; 1801 if (clear & TIOCM_DTR) 1802 mcr &= ~UART_MCR_DTR; 1803 if (clear & TIOCM_LOOP) 1804 mcr &= ~UART_MCR_LOOP; 1805 1806 mos7720_port->shadowMCR = mcr; 1807 write_mos_reg(port->serial, port->number - port->serial->minor, 1808 MCR, mos7720_port->shadowMCR); 1809 1810 return 0; 1811 } 1812 1813 static int mos7720_get_icount(struct tty_struct *tty, 1814 struct serial_icounter_struct *icount) 1815 { 1816 struct usb_serial_port *port = tty->driver_data; 1817 struct moschip_port *mos7720_port; 1818 struct async_icount cnow; 1819 1820 mos7720_port = usb_get_serial_port_data(port); 1821 cnow = mos7720_port->icount; 1822 1823 icount->cts = cnow.cts; 1824 icount->dsr = cnow.dsr; 1825 icount->rng = cnow.rng; 1826 icount->dcd = cnow.dcd; 1827 icount->rx = cnow.rx; 1828 icount->tx = cnow.tx; 1829 icount->frame = cnow.frame; 1830 icount->overrun = cnow.overrun; 1831 icount->parity = cnow.parity; 1832 icount->brk = cnow.brk; 1833 icount->buf_overrun = cnow.buf_overrun; 1834 1835 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__, 1836 icount->rx, icount->tx); 1837 return 0; 1838 } 1839 1840 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1841 unsigned int __user *value) 1842 { 1843 unsigned int mcr; 1844 unsigned int arg; 1845 1846 struct usb_serial_port *port; 1847 1848 if (mos7720_port == NULL) 1849 return -1; 1850 1851 port = (struct usb_serial_port *)mos7720_port->port; 1852 mcr = mos7720_port->shadowMCR; 1853 1854 if (copy_from_user(&arg, value, sizeof(int))) 1855 return -EFAULT; 1856 1857 switch (cmd) { 1858 case TIOCMBIS: 1859 if (arg & TIOCM_RTS) 1860 mcr |= UART_MCR_RTS; 1861 if (arg & TIOCM_DTR) 1862 mcr |= UART_MCR_RTS; 1863 if (arg & TIOCM_LOOP) 1864 mcr |= UART_MCR_LOOP; 1865 break; 1866 1867 case TIOCMBIC: 1868 if (arg & TIOCM_RTS) 1869 mcr &= ~UART_MCR_RTS; 1870 if (arg & TIOCM_DTR) 1871 mcr &= ~UART_MCR_RTS; 1872 if (arg & TIOCM_LOOP) 1873 mcr &= ~UART_MCR_LOOP; 1874 break; 1875 1876 } 1877 1878 mos7720_port->shadowMCR = mcr; 1879 write_mos_reg(port->serial, port->number - port->serial->minor, 1880 MCR, mos7720_port->shadowMCR); 1881 1882 return 0; 1883 } 1884 1885 static int get_serial_info(struct moschip_port *mos7720_port, 1886 struct serial_struct __user *retinfo) 1887 { 1888 struct serial_struct tmp; 1889 1890 if (!retinfo) 1891 return -EFAULT; 1892 1893 memset(&tmp, 0, sizeof(tmp)); 1894 1895 tmp.type = PORT_16550A; 1896 tmp.line = mos7720_port->port->serial->minor; 1897 tmp.port = mos7720_port->port->number; 1898 tmp.irq = 0; 1899 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1900 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1901 tmp.baud_base = 9600; 1902 tmp.close_delay = 5*HZ; 1903 tmp.closing_wait = 30*HZ; 1904 1905 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1906 return -EFAULT; 1907 return 0; 1908 } 1909 1910 static int mos7720_ioctl(struct tty_struct *tty, 1911 unsigned int cmd, unsigned long arg) 1912 { 1913 struct usb_serial_port *port = tty->driver_data; 1914 struct moschip_port *mos7720_port; 1915 struct async_icount cnow; 1916 struct async_icount cprev; 1917 1918 mos7720_port = usb_get_serial_port_data(port); 1919 if (mos7720_port == NULL) 1920 return -ENODEV; 1921 1922 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1923 1924 switch (cmd) { 1925 case TIOCSERGETLSR: 1926 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1927 return get_lsr_info(tty, mos7720_port, 1928 (unsigned int __user *)arg); 1929 1930 /* FIXME: These should be using the mode methods */ 1931 case TIOCMBIS: 1932 case TIOCMBIC: 1933 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1934 return set_modem_info(mos7720_port, cmd, 1935 (unsigned int __user *)arg); 1936 1937 case TIOCGSERIAL: 1938 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1939 return get_serial_info(mos7720_port, 1940 (struct serial_struct __user *)arg); 1941 1942 case TIOCMIWAIT: 1943 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__); 1944 cprev = mos7720_port->icount; 1945 while (1) { 1946 if (signal_pending(current)) 1947 return -ERESTARTSYS; 1948 cnow = mos7720_port->icount; 1949 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1950 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1951 return -EIO; /* no change => error */ 1952 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1953 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1954 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1955 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1956 return 0; 1957 } 1958 cprev = cnow; 1959 } 1960 /* NOTREACHED */ 1961 break; 1962 } 1963 1964 return -ENOIOCTLCMD; 1965 } 1966 1967 static int mos7720_startup(struct usb_serial *serial) 1968 { 1969 struct usb_device *dev; 1970 char data; 1971 u16 product; 1972 int ret_val; 1973 1974 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1975 dev = serial->dev; 1976 1977 /* 1978 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1979 * port, and the second for the serial port. Because the usbserial core 1980 * assumes both pairs are serial ports, we must engage in a bit of 1981 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1982 * port 0 point to the serial port. However, both moschip devices use a 1983 * single interrupt-in endpoint for both ports (as mentioned a little 1984 * further down), and this endpoint was assigned to port 0. So after 1985 * the swap, we must copy the interrupt endpoint elements from port 1 1986 * (as newly assigned) to port 0, and null out port 1 pointers. 1987 */ 1988 if (product == MOSCHIP_DEVICE_ID_7715) { 1989 struct usb_serial_port *tmp = serial->port[0]; 1990 serial->port[0] = serial->port[1]; 1991 serial->port[1] = tmp; 1992 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1993 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1994 serial->port[0]->interrupt_in_endpointAddress = 1995 tmp->interrupt_in_endpointAddress; 1996 serial->port[1]->interrupt_in_urb = NULL; 1997 serial->port[1]->interrupt_in_buffer = NULL; 1998 } 1999 2000 /* setting configuration feature to one */ 2001 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2002 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 2003 2004 /* start the interrupt urb */ 2005 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 2006 if (ret_val) 2007 dev_err(&dev->dev, 2008 "%s - Error %d submitting control urb\n", 2009 __func__, ret_val); 2010 2011 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2012 if (product == MOSCHIP_DEVICE_ID_7715) { 2013 ret_val = mos7715_parport_init(serial); 2014 if (ret_val < 0) 2015 return ret_val; 2016 } 2017 #endif 2018 /* LSR For Port 1 */ 2019 read_mos_reg(serial, 0, LSR, &data); 2020 dev_dbg(&dev->dev, "LSR:%x\n", data); 2021 2022 return 0; 2023 } 2024 2025 static void mos7720_release(struct usb_serial *serial) 2026 { 2027 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2028 /* close the parallel port */ 2029 2030 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2031 == MOSCHIP_DEVICE_ID_7715) { 2032 struct urbtracker *urbtrack; 2033 unsigned long flags; 2034 struct mos7715_parport *mos_parport = 2035 usb_get_serial_data(serial); 2036 2037 /* prevent NULL ptr dereference in port callbacks */ 2038 spin_lock(&release_lock); 2039 mos_parport->pp->private_data = NULL; 2040 spin_unlock(&release_lock); 2041 2042 /* wait for synchronous usb calls to return */ 2043 if (mos_parport->msg_pending) 2044 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2045 MOS_WDR_TIMEOUT); 2046 2047 parport_remove_port(mos_parport->pp); 2048 usb_set_serial_data(serial, NULL); 2049 mos_parport->serial = NULL; 2050 2051 /* if tasklet currently scheduled, wait for it to complete */ 2052 tasklet_kill(&mos_parport->urb_tasklet); 2053 2054 /* unlink any urbs sent by the tasklet */ 2055 spin_lock_irqsave(&mos_parport->listlock, flags); 2056 list_for_each_entry(urbtrack, 2057 &mos_parport->active_urbs, 2058 urblist_entry) 2059 usb_unlink_urb(urbtrack->urb); 2060 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2061 2062 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2063 } 2064 #endif 2065 } 2066 2067 static int mos7720_port_probe(struct usb_serial_port *port) 2068 { 2069 struct moschip_port *mos7720_port; 2070 2071 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2072 if (!mos7720_port) 2073 return -ENOMEM; 2074 2075 /* Initialize all port interrupt end point to port 0 int endpoint. 2076 * Our device has only one interrupt endpoint common to all ports. 2077 */ 2078 port->interrupt_in_endpointAddress = 2079 port->serial->port[0]->interrupt_in_endpointAddress; 2080 mos7720_port->port = port; 2081 2082 usb_set_serial_port_data(port, mos7720_port); 2083 2084 return 0; 2085 } 2086 2087 static int mos7720_port_remove(struct usb_serial_port *port) 2088 { 2089 struct moschip_port *mos7720_port; 2090 2091 mos7720_port = usb_get_serial_port_data(port); 2092 kfree(mos7720_port); 2093 2094 return 0; 2095 } 2096 2097 static struct usb_serial_driver moschip7720_2port_driver = { 2098 .driver = { 2099 .owner = THIS_MODULE, 2100 .name = "moschip7720", 2101 }, 2102 .description = "Moschip 2 port adapter", 2103 .id_table = id_table, 2104 .calc_num_ports = mos77xx_calc_num_ports, 2105 .open = mos7720_open, 2106 .close = mos7720_close, 2107 .throttle = mos7720_throttle, 2108 .unthrottle = mos7720_unthrottle, 2109 .probe = mos77xx_probe, 2110 .attach = mos7720_startup, 2111 .release = mos7720_release, 2112 .port_probe = mos7720_port_probe, 2113 .port_remove = mos7720_port_remove, 2114 .ioctl = mos7720_ioctl, 2115 .tiocmget = mos7720_tiocmget, 2116 .tiocmset = mos7720_tiocmset, 2117 .get_icount = mos7720_get_icount, 2118 .set_termios = mos7720_set_termios, 2119 .write = mos7720_write, 2120 .write_room = mos7720_write_room, 2121 .chars_in_buffer = mos7720_chars_in_buffer, 2122 .break_ctl = mos7720_break, 2123 .read_bulk_callback = mos7720_bulk_in_callback, 2124 .read_int_callback = NULL /* dynamically assigned in probe() */ 2125 }; 2126 2127 static struct usb_serial_driver * const serial_drivers[] = { 2128 &moschip7720_2port_driver, NULL 2129 }; 2130 2131 module_usb_serial_driver(serial_drivers, id_table); 2132 2133 MODULE_AUTHOR(DRIVER_AUTHOR); 2134 MODULE_DESCRIPTION(DRIVER_DESC); 2135 MODULE_LICENSE("GPL"); 2136