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 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 40 #define DRIVER_DESC "Moschip USB Serial Driver" 41 42 /* default urb timeout */ 43 #define MOS_WDR_TIMEOUT 5000 44 45 #define MOS_MAX_PORT 0x02 46 #define MOS_WRITE 0x0E 47 #define MOS_READ 0x0D 48 49 /* Interrupt Rotinue Defines */ 50 #define SERIAL_IIR_RLS 0x06 51 #define SERIAL_IIR_RDA 0x04 52 #define SERIAL_IIR_CTI 0x0c 53 #define SERIAL_IIR_THR 0x02 54 #define SERIAL_IIR_MS 0x00 55 56 #define NUM_URBS 16 /* URB Count */ 57 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 58 59 /* This structure holds all of the local serial port information */ 60 struct moschip_port { 61 __u8 shadowLCR; /* last LCR value received */ 62 __u8 shadowMCR; /* last MCR value received */ 63 __u8 shadowMSR; /* last MSR value received */ 64 char open; 65 struct usb_serial_port *port; /* loop back to the owner */ 66 struct urb *write_urb_pool[NUM_URBS]; 67 }; 68 69 static struct usb_serial_driver moschip7720_2port_driver; 70 71 #define USB_VENDOR_ID_MOSCHIP 0x9710 72 #define MOSCHIP_DEVICE_ID_7720 0x7720 73 #define MOSCHIP_DEVICE_ID_7715 0x7715 74 75 static const struct usb_device_id id_table[] = { 76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 78 { } /* terminating entry */ 79 }; 80 MODULE_DEVICE_TABLE(usb, id_table); 81 82 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 83 84 /* initial values for parport regs */ 85 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 86 #define ECR_INIT_VAL 0x00 /* SPP mode */ 87 88 struct urbtracker { 89 struct mos7715_parport *mos_parport; 90 struct list_head urblist_entry; 91 struct kref ref_count; 92 struct urb *urb; 93 }; 94 95 enum mos7715_pp_modes { 96 SPP = 0<<5, 97 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 98 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 99 }; 100 101 struct mos7715_parport { 102 struct parport *pp; /* back to containing struct */ 103 struct kref ref_count; /* to instance of this struct */ 104 struct list_head deferred_urbs; /* list deferred async urbs */ 105 struct list_head active_urbs; /* list async urbs in flight */ 106 spinlock_t listlock; /* protects list access */ 107 bool msg_pending; /* usb sync call pending */ 108 struct completion syncmsg_compl; /* usb sync call completed */ 109 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 110 struct usb_serial *serial; /* back to containing struct */ 111 __u8 shadowECR; /* parallel port regs... */ 112 __u8 shadowDCR; 113 atomic_t shadowDSR; /* updated in int-in callback */ 114 }; 115 116 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 117 static DEFINE_SPINLOCK(release_lock); 118 119 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 120 121 static const unsigned int dummy; /* for clarity in register access fns */ 122 123 enum mos_regs { 124 THR, /* serial port regs */ 125 RHR, 126 IER, 127 FCR, 128 ISR, 129 LCR, 130 MCR, 131 LSR, 132 MSR, 133 SPR, 134 DLL, 135 DLM, 136 DPR, /* parallel port regs */ 137 DSR, 138 DCR, 139 ECR, 140 SP1_REG, /* device control regs */ 141 SP2_REG, /* serial port 2 (7720 only) */ 142 PP_REG, 143 SP_CONTROL_REG, 144 }; 145 146 /* 147 * Return the correct value for the Windex field of the setup packet 148 * for a control endpoint message. See the 7715 datasheet. 149 */ 150 static inline __u16 get_reg_index(enum mos_regs reg) 151 { 152 static const __u16 mos7715_index_lookup_table[] = { 153 0x00, /* THR */ 154 0x00, /* RHR */ 155 0x01, /* IER */ 156 0x02, /* FCR */ 157 0x02, /* ISR */ 158 0x03, /* LCR */ 159 0x04, /* MCR */ 160 0x05, /* LSR */ 161 0x06, /* MSR */ 162 0x07, /* SPR */ 163 0x00, /* DLL */ 164 0x01, /* DLM */ 165 0x00, /* DPR */ 166 0x01, /* DSR */ 167 0x02, /* DCR */ 168 0x0a, /* ECR */ 169 0x01, /* SP1_REG */ 170 0x02, /* SP2_REG (7720 only) */ 171 0x04, /* PP_REG (7715 only) */ 172 0x08, /* SP_CONTROL_REG */ 173 }; 174 return mos7715_index_lookup_table[reg]; 175 } 176 177 /* 178 * Return the correct value for the upper byte of the Wvalue field of 179 * the setup packet for a control endpoint message. 180 */ 181 static inline __u16 get_reg_value(enum mos_regs reg, 182 unsigned int serial_portnum) 183 { 184 if (reg >= SP1_REG) /* control reg */ 185 return 0x0000; 186 187 else if (reg >= DPR) /* parallel port reg (7715 only) */ 188 return 0x0100; 189 190 else /* serial port reg */ 191 return (serial_portnum + 2) << 8; 192 } 193 194 /* 195 * Write data byte to the specified device register. The data is embedded in 196 * the value field of the setup packet. serial_portnum is ignored for registers 197 * not specific to a particular serial port. 198 */ 199 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 200 enum mos_regs reg, __u8 data) 201 { 202 struct usb_device *usbdev = serial->dev; 203 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 204 __u8 request = (__u8)0x0e; 205 __u8 requesttype = (__u8)0x40; 206 __u16 index = get_reg_index(reg); 207 __u16 value = get_reg_value(reg, serial_portnum) + data; 208 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 209 index, NULL, 0, MOS_WDR_TIMEOUT); 210 if (status < 0) 211 dev_err(&usbdev->dev, 212 "mos7720: usb_control_msg() failed: %d", status); 213 return status; 214 } 215 216 /* 217 * Read data byte from the specified device register. The data returned by the 218 * device is embedded in the value field of the setup packet. serial_portnum is 219 * ignored for registers that are not specific to a particular serial port. 220 */ 221 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 222 enum mos_regs reg, __u8 *data) 223 { 224 struct usb_device *usbdev = serial->dev; 225 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 226 __u8 request = (__u8)0x0d; 227 __u8 requesttype = (__u8)0xc0; 228 __u16 index = get_reg_index(reg); 229 __u16 value = get_reg_value(reg, serial_portnum); 230 u8 *buf; 231 int status; 232 233 buf = kmalloc(1, GFP_KERNEL); 234 if (!buf) 235 return -ENOMEM; 236 237 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 238 index, buf, 1, MOS_WDR_TIMEOUT); 239 if (status == 1) 240 *data = *buf; 241 else if (status < 0) 242 dev_err(&usbdev->dev, 243 "mos7720: usb_control_msg() failed: %d", status); 244 kfree(buf); 245 246 return status; 247 } 248 249 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 250 251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 252 enum mos7715_pp_modes mode) 253 { 254 mos_parport->shadowECR = mode; 255 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 256 return 0; 257 } 258 259 static void destroy_mos_parport(struct kref *kref) 260 { 261 struct mos7715_parport *mos_parport = 262 container_of(kref, struct mos7715_parport, ref_count); 263 264 kfree(mos_parport); 265 } 266 267 static void destroy_urbtracker(struct kref *kref) 268 { 269 struct urbtracker *urbtrack = 270 container_of(kref, struct urbtracker, ref_count); 271 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 272 273 usb_free_urb(urbtrack->urb); 274 kfree(urbtrack); 275 kref_put(&mos_parport->ref_count, destroy_mos_parport); 276 } 277 278 /* 279 * This runs as a tasklet when sending an urb in a non-blocking parallel 280 * port callback had to be deferred because the disconnect mutex could not be 281 * obtained at the time. 282 */ 283 static void send_deferred_urbs(unsigned long _mos_parport) 284 { 285 int ret_val; 286 unsigned long flags; 287 struct mos7715_parport *mos_parport = (void *)_mos_parport; 288 struct urbtracker *urbtrack, *tmp; 289 struct list_head *cursor, *next; 290 struct device *dev; 291 292 /* if release function ran, game over */ 293 if (unlikely(mos_parport->serial == NULL)) 294 return; 295 296 dev = &mos_parport->serial->dev->dev; 297 298 /* try again to get the mutex */ 299 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 300 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 301 tasklet_schedule(&mos_parport->urb_tasklet); 302 return; 303 } 304 305 /* if device disconnected, game over */ 306 if (unlikely(mos_parport->serial->disconnected)) { 307 mutex_unlock(&mos_parport->serial->disc_mutex); 308 return; 309 } 310 311 spin_lock_irqsave(&mos_parport->listlock, flags); 312 if (list_empty(&mos_parport->deferred_urbs)) { 313 spin_unlock_irqrestore(&mos_parport->listlock, flags); 314 mutex_unlock(&mos_parport->serial->disc_mutex); 315 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 316 return; 317 } 318 319 /* move contents of deferred_urbs list to active_urbs list and submit */ 320 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 321 list_move_tail(cursor, &mos_parport->active_urbs); 322 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 323 urblist_entry) { 324 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 325 dev_dbg(dev, "%s: urb submitted\n", __func__); 326 if (ret_val) { 327 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 328 list_del(&urbtrack->urblist_entry); 329 kref_put(&urbtrack->ref_count, destroy_urbtracker); 330 } 331 } 332 spin_unlock_irqrestore(&mos_parport->listlock, flags); 333 mutex_unlock(&mos_parport->serial->disc_mutex); 334 } 335 336 /* callback for parallel port control urbs submitted asynchronously */ 337 static void async_complete(struct urb *urb) 338 { 339 struct urbtracker *urbtrack = urb->context; 340 int status = urb->status; 341 342 if (unlikely(status)) 343 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 344 345 /* remove the urbtracker from the active_urbs list */ 346 spin_lock(&urbtrack->mos_parport->listlock); 347 list_del(&urbtrack->urblist_entry); 348 spin_unlock(&urbtrack->mos_parport->listlock); 349 kref_put(&urbtrack->ref_count, destroy_urbtracker); 350 } 351 352 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 353 enum mos_regs reg, __u8 data) 354 { 355 struct urbtracker *urbtrack; 356 int ret_val; 357 unsigned long flags; 358 struct usb_ctrlrequest setup; 359 struct usb_serial *serial = mos_parport->serial; 360 struct usb_device *usbdev = serial->dev; 361 362 /* create and initialize the control urb and containing urbtracker */ 363 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 364 if (urbtrack == NULL) { 365 dev_err(&usbdev->dev, "out of memory"); 366 return -ENOMEM; 367 } 368 kref_get(&mos_parport->ref_count); 369 urbtrack->mos_parport = mos_parport; 370 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 371 if (urbtrack->urb == NULL) { 372 dev_err(&usbdev->dev, "out of urbs"); 373 kfree(urbtrack); 374 return -ENOMEM; 375 } 376 setup.bRequestType = (__u8)0x40; 377 setup.bRequest = (__u8)0x0e; 378 setup.wValue = get_reg_value(reg, dummy); 379 setup.wIndex = get_reg_index(reg); 380 setup.wLength = 0; 381 usb_fill_control_urb(urbtrack->urb, usbdev, 382 usb_sndctrlpipe(usbdev, 0), 383 (unsigned char *)&setup, 384 NULL, 0, async_complete, urbtrack); 385 kref_init(&urbtrack->ref_count); 386 INIT_LIST_HEAD(&urbtrack->urblist_entry); 387 388 /* 389 * get the disconnect mutex, or add tracker to the deferred_urbs list 390 * and schedule a tasklet to try again later 391 */ 392 if (!mutex_trylock(&serial->disc_mutex)) { 393 spin_lock_irqsave(&mos_parport->listlock, flags); 394 list_add_tail(&urbtrack->urblist_entry, 395 &mos_parport->deferred_urbs); 396 spin_unlock_irqrestore(&mos_parport->listlock, flags); 397 tasklet_schedule(&mos_parport->urb_tasklet); 398 dev_dbg(&usbdev->dev, "tasklet scheduled"); 399 return 0; 400 } 401 402 /* bail if device disconnected */ 403 if (serial->disconnected) { 404 kref_put(&urbtrack->ref_count, destroy_urbtracker); 405 mutex_unlock(&serial->disc_mutex); 406 return -ENODEV; 407 } 408 409 /* add the tracker to the active_urbs list and submit */ 410 spin_lock_irqsave(&mos_parport->listlock, flags); 411 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 412 spin_unlock_irqrestore(&mos_parport->listlock, flags); 413 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 414 mutex_unlock(&serial->disc_mutex); 415 if (ret_val) { 416 dev_err(&usbdev->dev, 417 "%s: submit_urb() failed: %d", __func__, ret_val); 418 spin_lock_irqsave(&mos_parport->listlock, flags); 419 list_del(&urbtrack->urblist_entry); 420 spin_unlock_irqrestore(&mos_parport->listlock, flags); 421 kref_put(&urbtrack->ref_count, destroy_urbtracker); 422 return ret_val; 423 } 424 return 0; 425 } 426 427 /* 428 * This is the the common top part of all parallel port callback operations that 429 * send synchronous messages to the device. This implements convoluted locking 430 * that avoids two scenarios: (1) a port operation is called after usbserial 431 * has called our release function, at which point struct mos7715_parport has 432 * been destroyed, and (2) the device has been disconnected, but usbserial has 433 * not called the release function yet because someone has a serial port open. 434 * The shared release_lock prevents the first, and the mutex and disconnected 435 * flag maintained by usbserial covers the second. We also use the msg_pending 436 * flag to ensure that all synchronous usb messgage calls have completed before 437 * our release function can return. 438 */ 439 static int parport_prologue(struct parport *pp) 440 { 441 struct mos7715_parport *mos_parport; 442 443 spin_lock(&release_lock); 444 mos_parport = pp->private_data; 445 if (unlikely(mos_parport == NULL)) { 446 /* release fn called, port struct destroyed */ 447 spin_unlock(&release_lock); 448 return -1; 449 } 450 mos_parport->msg_pending = true; /* synch usb call pending */ 451 INIT_COMPLETION(mos_parport->syncmsg_compl); 452 spin_unlock(&release_lock); 453 454 mutex_lock(&mos_parport->serial->disc_mutex); 455 if (mos_parport->serial->disconnected) { 456 /* device disconnected */ 457 mutex_unlock(&mos_parport->serial->disc_mutex); 458 mos_parport->msg_pending = false; 459 complete(&mos_parport->syncmsg_compl); 460 return -1; 461 } 462 463 return 0; 464 } 465 466 /* 467 * This is the the common bottom part of all parallel port functions that send 468 * synchronous messages to the device. 469 */ 470 static inline void parport_epilogue(struct parport *pp) 471 { 472 struct mos7715_parport *mos_parport = pp->private_data; 473 mutex_unlock(&mos_parport->serial->disc_mutex); 474 mos_parport->msg_pending = false; 475 complete(&mos_parport->syncmsg_compl); 476 } 477 478 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 479 { 480 struct mos7715_parport *mos_parport = pp->private_data; 481 482 if (parport_prologue(pp) < 0) 483 return; 484 mos7715_change_mode(mos_parport, SPP); 485 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 486 parport_epilogue(pp); 487 } 488 489 static unsigned char parport_mos7715_read_data(struct parport *pp) 490 { 491 struct mos7715_parport *mos_parport = pp->private_data; 492 unsigned char d; 493 494 if (parport_prologue(pp) < 0) 495 return 0; 496 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 497 parport_epilogue(pp); 498 return d; 499 } 500 501 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 502 { 503 struct mos7715_parport *mos_parport = pp->private_data; 504 __u8 data; 505 506 if (parport_prologue(pp) < 0) 507 return; 508 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 509 write_mos_reg(mos_parport->serial, dummy, DCR, data); 510 mos_parport->shadowDCR = data; 511 parport_epilogue(pp); 512 } 513 514 static unsigned char parport_mos7715_read_control(struct parport *pp) 515 { 516 struct mos7715_parport *mos_parport = pp->private_data; 517 __u8 dcr; 518 519 spin_lock(&release_lock); 520 mos_parport = pp->private_data; 521 if (unlikely(mos_parport == NULL)) { 522 spin_unlock(&release_lock); 523 return 0; 524 } 525 dcr = mos_parport->shadowDCR & 0x0f; 526 spin_unlock(&release_lock); 527 return dcr; 528 } 529 530 static unsigned char parport_mos7715_frob_control(struct parport *pp, 531 unsigned char mask, 532 unsigned char val) 533 { 534 struct mos7715_parport *mos_parport = pp->private_data; 535 __u8 dcr; 536 537 mask &= 0x0f; 538 val &= 0x0f; 539 if (parport_prologue(pp) < 0) 540 return 0; 541 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 542 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 543 dcr = mos_parport->shadowDCR & 0x0f; 544 parport_epilogue(pp); 545 return dcr; 546 } 547 548 static unsigned char parport_mos7715_read_status(struct parport *pp) 549 { 550 unsigned char status; 551 struct mos7715_parport *mos_parport = pp->private_data; 552 553 spin_lock(&release_lock); 554 mos_parport = pp->private_data; 555 if (unlikely(mos_parport == NULL)) { /* release called */ 556 spin_unlock(&release_lock); 557 return 0; 558 } 559 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 560 spin_unlock(&release_lock); 561 return status; 562 } 563 564 static void parport_mos7715_enable_irq(struct parport *pp) 565 { 566 } 567 568 static void parport_mos7715_disable_irq(struct parport *pp) 569 { 570 } 571 572 static void parport_mos7715_data_forward(struct parport *pp) 573 { 574 struct mos7715_parport *mos_parport = pp->private_data; 575 576 if (parport_prologue(pp) < 0) 577 return; 578 mos7715_change_mode(mos_parport, PS2); 579 mos_parport->shadowDCR &= ~0x20; 580 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 581 parport_epilogue(pp); 582 } 583 584 static void parport_mos7715_data_reverse(struct parport *pp) 585 { 586 struct mos7715_parport *mos_parport = pp->private_data; 587 588 if (parport_prologue(pp) < 0) 589 return; 590 mos7715_change_mode(mos_parport, PS2); 591 mos_parport->shadowDCR |= 0x20; 592 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 593 parport_epilogue(pp); 594 } 595 596 static void parport_mos7715_init_state(struct pardevice *dev, 597 struct parport_state *s) 598 { 599 s->u.pc.ctr = DCR_INIT_VAL; 600 s->u.pc.ecr = ECR_INIT_VAL; 601 } 602 603 /* N.B. Parport core code requires that this function not block */ 604 static void parport_mos7715_save_state(struct parport *pp, 605 struct parport_state *s) 606 { 607 struct mos7715_parport *mos_parport; 608 609 spin_lock(&release_lock); 610 mos_parport = pp->private_data; 611 if (unlikely(mos_parport == NULL)) { /* release called */ 612 spin_unlock(&release_lock); 613 return; 614 } 615 s->u.pc.ctr = mos_parport->shadowDCR; 616 s->u.pc.ecr = mos_parport->shadowECR; 617 spin_unlock(&release_lock); 618 } 619 620 /* N.B. Parport core code requires that this function not block */ 621 static void parport_mos7715_restore_state(struct parport *pp, 622 struct parport_state *s) 623 { 624 struct mos7715_parport *mos_parport; 625 626 spin_lock(&release_lock); 627 mos_parport = pp->private_data; 628 if (unlikely(mos_parport == NULL)) { /* release called */ 629 spin_unlock(&release_lock); 630 return; 631 } 632 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 633 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 634 spin_unlock(&release_lock); 635 } 636 637 static size_t parport_mos7715_write_compat(struct parport *pp, 638 const void *buffer, 639 size_t len, int flags) 640 { 641 int retval; 642 struct mos7715_parport *mos_parport = pp->private_data; 643 int actual_len; 644 645 if (parport_prologue(pp) < 0) 646 return 0; 647 mos7715_change_mode(mos_parport, PPF); 648 retval = usb_bulk_msg(mos_parport->serial->dev, 649 usb_sndbulkpipe(mos_parport->serial->dev, 2), 650 (void *)buffer, len, &actual_len, 651 MOS_WDR_TIMEOUT); 652 parport_epilogue(pp); 653 if (retval) { 654 dev_err(&mos_parport->serial->dev->dev, 655 "mos7720: usb_bulk_msg() failed: %d", retval); 656 return 0; 657 } 658 return actual_len; 659 } 660 661 static struct parport_operations parport_mos7715_ops = { 662 .owner = THIS_MODULE, 663 .write_data = parport_mos7715_write_data, 664 .read_data = parport_mos7715_read_data, 665 666 .write_control = parport_mos7715_write_control, 667 .read_control = parport_mos7715_read_control, 668 .frob_control = parport_mos7715_frob_control, 669 670 .read_status = parport_mos7715_read_status, 671 672 .enable_irq = parport_mos7715_enable_irq, 673 .disable_irq = parport_mos7715_disable_irq, 674 675 .data_forward = parport_mos7715_data_forward, 676 .data_reverse = parport_mos7715_data_reverse, 677 678 .init_state = parport_mos7715_init_state, 679 .save_state = parport_mos7715_save_state, 680 .restore_state = parport_mos7715_restore_state, 681 682 .compat_write_data = parport_mos7715_write_compat, 683 684 .nibble_read_data = parport_ieee1284_read_nibble, 685 .byte_read_data = parport_ieee1284_read_byte, 686 }; 687 688 /* 689 * Allocate and initialize parallel port control struct, initialize 690 * the parallel port hardware device, and register with the parport subsystem. 691 */ 692 static int mos7715_parport_init(struct usb_serial *serial) 693 { 694 struct mos7715_parport *mos_parport; 695 696 /* allocate and initialize parallel port control struct */ 697 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 698 if (mos_parport == NULL) { 699 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__); 700 return -ENOMEM; 701 } 702 mos_parport->msg_pending = false; 703 kref_init(&mos_parport->ref_count); 704 spin_lock_init(&mos_parport->listlock); 705 INIT_LIST_HEAD(&mos_parport->active_urbs); 706 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 707 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 708 mos_parport->serial = serial; 709 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 710 (unsigned long) mos_parport); 711 init_completion(&mos_parport->syncmsg_compl); 712 713 /* cycle parallel port reset bit */ 714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 716 717 /* initialize device registers */ 718 mos_parport->shadowDCR = DCR_INIT_VAL; 719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 720 mos_parport->shadowECR = ECR_INIT_VAL; 721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 722 723 /* register with parport core */ 724 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 725 PARPORT_DMA_NONE, 726 &parport_mos7715_ops); 727 if (mos_parport->pp == NULL) { 728 dev_err(&serial->interface->dev, 729 "Could not register parport\n"); 730 kref_put(&mos_parport->ref_count, destroy_mos_parport); 731 return -EIO; 732 } 733 mos_parport->pp->private_data = mos_parport; 734 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 735 mos_parport->pp->dev = &serial->interface->dev; 736 parport_announce_port(mos_parport->pp); 737 738 return 0; 739 } 740 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 741 742 /* 743 * mos7720_interrupt_callback 744 * this is the callback function for when we have received data on the 745 * interrupt endpoint. 746 */ 747 static void mos7720_interrupt_callback(struct urb *urb) 748 { 749 int result; 750 int length; 751 int status = urb->status; 752 struct device *dev = &urb->dev->dev; 753 __u8 *data; 754 __u8 sp1; 755 __u8 sp2; 756 757 switch (status) { 758 case 0: 759 /* success */ 760 break; 761 case -ECONNRESET: 762 case -ENOENT: 763 case -ESHUTDOWN: 764 /* this urb is terminated, clean up */ 765 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 766 return; 767 default: 768 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 769 goto exit; 770 } 771 772 length = urb->actual_length; 773 data = urb->transfer_buffer; 774 775 /* Moschip get 4 bytes 776 * Byte 1 IIR Port 1 (port.number is 0) 777 * Byte 2 IIR Port 2 (port.number is 1) 778 * Byte 3 -------------- 779 * Byte 4 FIFO status for both */ 780 781 /* the above description is inverted 782 * oneukum 2007-03-14 */ 783 784 if (unlikely(length != 4)) { 785 dev_dbg(dev, "Wrong data !!!\n"); 786 return; 787 } 788 789 sp1 = data[3]; 790 sp2 = data[2]; 791 792 if ((sp1 | sp2) & 0x01) { 793 /* No Interrupt Pending in both the ports */ 794 dev_dbg(dev, "No Interrupt !!!\n"); 795 } else { 796 switch (sp1 & 0x0f) { 797 case SERIAL_IIR_RLS: 798 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 799 break; 800 case SERIAL_IIR_CTI: 801 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 802 break; 803 case SERIAL_IIR_MS: 804 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 805 break; 806 } 807 808 switch (sp2 & 0x0f) { 809 case SERIAL_IIR_RLS: 810 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 811 break; 812 case SERIAL_IIR_CTI: 813 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 814 break; 815 case SERIAL_IIR_MS: 816 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 817 break; 818 } 819 } 820 821 exit: 822 result = usb_submit_urb(urb, GFP_ATOMIC); 823 if (result) 824 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 825 } 826 827 /* 828 * mos7715_interrupt_callback 829 * this is the 7715's callback function for when we have received data on 830 * the interrupt endpoint. 831 */ 832 static void mos7715_interrupt_callback(struct urb *urb) 833 { 834 int result; 835 int length; 836 int status = urb->status; 837 struct device *dev = &urb->dev->dev; 838 __u8 *data; 839 __u8 iir; 840 841 switch (status) { 842 case 0: 843 /* success */ 844 break; 845 case -ECONNRESET: 846 case -ENOENT: 847 case -ESHUTDOWN: 848 case -ENODEV: 849 /* this urb is terminated, clean up */ 850 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 851 return; 852 default: 853 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, 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 dev_dbg(dev, "Wrong data !!!\n"); 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 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n"); 876 break; 877 case SERIAL_IIR_CTI: 878 dev_dbg(dev, "Serial Port: Receiver time out\n"); 879 break; 880 case SERIAL_IIR_MS: 881 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 882 break; 883 } 884 } 885 886 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 887 { /* update local copy of DSR reg */ 888 struct usb_serial_port *port = urb->context; 889 struct mos7715_parport *mos_parport = port->serial->private; 890 if (unlikely(mos_parport == NULL)) 891 return; 892 atomic_set(&mos_parport->shadowDSR, data[2]); 893 } 894 #endif 895 896 exit: 897 result = usb_submit_urb(urb, GFP_ATOMIC); 898 if (result) 899 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 900 } 901 902 /* 903 * mos7720_bulk_in_callback 904 * this is the callback function for when we have received data on the 905 * bulk in endpoint. 906 */ 907 static void mos7720_bulk_in_callback(struct urb *urb) 908 { 909 int retval; 910 unsigned char *data ; 911 struct usb_serial_port *port; 912 int status = urb->status; 913 914 if (status) { 915 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 916 return; 917 } 918 919 port = urb->context; 920 921 dev_dbg(&port->dev, "Entering...%s\n", __func__); 922 923 data = urb->transfer_buffer; 924 925 if (urb->actual_length) { 926 tty_insert_flip_string(&port->port, data, urb->actual_length); 927 tty_flip_buffer_push(&port->port); 928 } 929 930 if (port->read_urb->status != -EINPROGRESS) { 931 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 932 if (retval) 933 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 934 } 935 } 936 937 /* 938 * mos7720_bulk_out_data_callback 939 * this is the callback function for when we have finished sending serial 940 * data on the bulk out endpoint. 941 */ 942 static void mos7720_bulk_out_data_callback(struct urb *urb) 943 { 944 struct moschip_port *mos7720_port; 945 int status = urb->status; 946 947 if (status) { 948 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 949 return; 950 } 951 952 mos7720_port = urb->context; 953 if (!mos7720_port) { 954 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 955 return ; 956 } 957 958 if (mos7720_port->open) 959 tty_port_tty_wakeup(&mos7720_port->port->port); 960 } 961 962 /* 963 * mos77xx_probe 964 * this function installs the appropriate read interrupt endpoint callback 965 * depending on whether the device is a 7720 or 7715, thus avoiding costly 966 * run-time checks in the high-frequency callback routine itself. 967 */ 968 static int mos77xx_probe(struct usb_serial *serial, 969 const struct usb_device_id *id) 970 { 971 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 972 moschip7720_2port_driver.read_int_callback = 973 mos7715_interrupt_callback; 974 else 975 moschip7720_2port_driver.read_int_callback = 976 mos7720_interrupt_callback; 977 978 return 0; 979 } 980 981 static int mos77xx_calc_num_ports(struct usb_serial *serial) 982 { 983 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 984 if (product == MOSCHIP_DEVICE_ID_7715) 985 return 1; 986 987 return 2; 988 } 989 990 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 991 { 992 struct usb_serial *serial; 993 struct urb *urb; 994 struct moschip_port *mos7720_port; 995 int response; 996 int port_number; 997 __u8 data; 998 int allocated_urbs = 0; 999 int j; 1000 1001 serial = port->serial; 1002 1003 mos7720_port = usb_get_serial_port_data(port); 1004 if (mos7720_port == NULL) 1005 return -ENODEV; 1006 1007 usb_clear_halt(serial->dev, port->write_urb->pipe); 1008 usb_clear_halt(serial->dev, port->read_urb->pipe); 1009 1010 /* Initialising the write urb pool */ 1011 for (j = 0; j < NUM_URBS; ++j) { 1012 urb = usb_alloc_urb(0, GFP_KERNEL); 1013 mos7720_port->write_urb_pool[j] = urb; 1014 1015 if (urb == NULL) { 1016 dev_err(&port->dev, "No more urbs???\n"); 1017 continue; 1018 } 1019 1020 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1021 GFP_KERNEL); 1022 if (!urb->transfer_buffer) { 1023 dev_err(&port->dev, 1024 "%s-out of memory for urb buffers.\n", 1025 __func__); 1026 usb_free_urb(mos7720_port->write_urb_pool[j]); 1027 mos7720_port->write_urb_pool[j] = NULL; 1028 continue; 1029 } 1030 allocated_urbs++; 1031 } 1032 1033 if (!allocated_urbs) 1034 return -ENOMEM; 1035 1036 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1037 * 1038 * Register Index 1039 * 0 : THR/RHR 1040 * 1 : IER 1041 * 2 : FCR 1042 * 3 : LCR 1043 * 4 : MCR 1044 * 5 : LSR 1045 * 6 : MSR 1046 * 7 : SPR 1047 * 1048 * 0x08 : SP1/2 Control Reg 1049 */ 1050 port_number = port->port_number; 1051 read_mos_reg(serial, port_number, LSR, &data); 1052 1053 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1054 1055 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1056 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1057 1058 write_mos_reg(serial, port_number, IER, 0x00); 1059 write_mos_reg(serial, port_number, FCR, 0x00); 1060 1061 write_mos_reg(serial, port_number, FCR, 0xcf); 1062 mos7720_port->shadowLCR = 0x03; 1063 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1064 mos7720_port->shadowMCR = 0x0b; 1065 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1066 1067 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1068 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1069 data = data | (port->port_number + 1); 1070 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1071 mos7720_port->shadowLCR = 0x83; 1072 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1073 write_mos_reg(serial, port_number, THR, 0x0c); 1074 write_mos_reg(serial, port_number, IER, 0x00); 1075 mos7720_port->shadowLCR = 0x03; 1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1077 write_mos_reg(serial, port_number, IER, 0x0c); 1078 1079 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1080 if (response) 1081 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1082 __func__, response); 1083 1084 /* initialize our port settings */ 1085 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1086 1087 /* send a open port command */ 1088 mos7720_port->open = 1; 1089 1090 return 0; 1091 } 1092 1093 /* 1094 * mos7720_chars_in_buffer 1095 * this function is called by the tty driver when it wants to know how many 1096 * bytes of data we currently have outstanding in the port (data that has 1097 * been written, but hasn't made it out the port yet) 1098 * If successful, we return the number of bytes left to be written in the 1099 * system, 1100 * Otherwise we return a negative error number. 1101 */ 1102 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1103 { 1104 struct usb_serial_port *port = tty->driver_data; 1105 int i; 1106 int chars = 0; 1107 struct moschip_port *mos7720_port; 1108 1109 mos7720_port = usb_get_serial_port_data(port); 1110 if (mos7720_port == NULL) 1111 return 0; 1112 1113 for (i = 0; i < NUM_URBS; ++i) { 1114 if (mos7720_port->write_urb_pool[i] && 1115 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1116 chars += URB_TRANSFER_BUFFER_SIZE; 1117 } 1118 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1119 return chars; 1120 } 1121 1122 static void mos7720_close(struct usb_serial_port *port) 1123 { 1124 struct usb_serial *serial; 1125 struct moschip_port *mos7720_port; 1126 int j; 1127 1128 serial = port->serial; 1129 1130 mos7720_port = usb_get_serial_port_data(port); 1131 if (mos7720_port == NULL) 1132 return; 1133 1134 for (j = 0; j < NUM_URBS; ++j) 1135 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1136 1137 /* Freeing Write URBs */ 1138 for (j = 0; j < NUM_URBS; ++j) { 1139 if (mos7720_port->write_urb_pool[j]) { 1140 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1141 usb_free_urb(mos7720_port->write_urb_pool[j]); 1142 } 1143 } 1144 1145 /* While closing port, shutdown all bulk read, write * 1146 * and interrupt read if they exists, otherwise nop */ 1147 usb_kill_urb(port->write_urb); 1148 usb_kill_urb(port->read_urb); 1149 1150 write_mos_reg(serial, port->port_number, MCR, 0x00); 1151 write_mos_reg(serial, port->port_number, IER, 0x00); 1152 1153 mos7720_port->open = 0; 1154 } 1155 1156 static void mos7720_break(struct tty_struct *tty, int break_state) 1157 { 1158 struct usb_serial_port *port = tty->driver_data; 1159 unsigned char data; 1160 struct usb_serial *serial; 1161 struct moschip_port *mos7720_port; 1162 1163 serial = port->serial; 1164 1165 mos7720_port = usb_get_serial_port_data(port); 1166 if (mos7720_port == NULL) 1167 return; 1168 1169 if (break_state == -1) 1170 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1171 else 1172 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1173 1174 mos7720_port->shadowLCR = data; 1175 write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR); 1176 } 1177 1178 /* 1179 * mos7720_write_room 1180 * this function is called by the tty driver when it wants to know how many 1181 * bytes of data we can accept for a specific port. 1182 * If successful, we return the amount of room that we have for this port 1183 * Otherwise we return a negative error number. 1184 */ 1185 static int mos7720_write_room(struct tty_struct *tty) 1186 { 1187 struct usb_serial_port *port = tty->driver_data; 1188 struct moschip_port *mos7720_port; 1189 int room = 0; 1190 int i; 1191 1192 mos7720_port = usb_get_serial_port_data(port); 1193 if (mos7720_port == NULL) 1194 return -ENODEV; 1195 1196 /* FIXME: Locking */ 1197 for (i = 0; i < NUM_URBS; ++i) { 1198 if (mos7720_port->write_urb_pool[i] && 1199 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1200 room += URB_TRANSFER_BUFFER_SIZE; 1201 } 1202 1203 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1204 return room; 1205 } 1206 1207 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1208 const unsigned char *data, int count) 1209 { 1210 int status; 1211 int i; 1212 int bytes_sent = 0; 1213 int transfer_size; 1214 1215 struct moschip_port *mos7720_port; 1216 struct usb_serial *serial; 1217 struct urb *urb; 1218 const unsigned char *current_position = data; 1219 1220 serial = port->serial; 1221 1222 mos7720_port = usb_get_serial_port_data(port); 1223 if (mos7720_port == NULL) 1224 return -ENODEV; 1225 1226 /* try to find a free urb in the list */ 1227 urb = NULL; 1228 1229 for (i = 0; i < NUM_URBS; ++i) { 1230 if (mos7720_port->write_urb_pool[i] && 1231 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1232 urb = mos7720_port->write_urb_pool[i]; 1233 dev_dbg(&port->dev, "URB:%d\n", i); 1234 break; 1235 } 1236 } 1237 1238 if (urb == NULL) { 1239 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1240 goto exit; 1241 } 1242 1243 if (urb->transfer_buffer == NULL) { 1244 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1245 GFP_KERNEL); 1246 if (urb->transfer_buffer == NULL) { 1247 dev_err_console(port, "%s no more kernel memory...\n", 1248 __func__); 1249 goto exit; 1250 } 1251 } 1252 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1253 1254 memcpy(urb->transfer_buffer, current_position, transfer_size); 1255 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1256 urb->transfer_buffer); 1257 1258 /* fill urb with data and submit */ 1259 usb_fill_bulk_urb(urb, serial->dev, 1260 usb_sndbulkpipe(serial->dev, 1261 port->bulk_out_endpointAddress), 1262 urb->transfer_buffer, transfer_size, 1263 mos7720_bulk_out_data_callback, mos7720_port); 1264 1265 /* send it down the pipe */ 1266 status = usb_submit_urb(urb, GFP_ATOMIC); 1267 if (status) { 1268 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1269 "with status = %d\n", __func__, status); 1270 bytes_sent = status; 1271 goto exit; 1272 } 1273 bytes_sent = transfer_size; 1274 1275 exit: 1276 return bytes_sent; 1277 } 1278 1279 static void mos7720_throttle(struct tty_struct *tty) 1280 { 1281 struct usb_serial_port *port = tty->driver_data; 1282 struct moschip_port *mos7720_port; 1283 int status; 1284 1285 mos7720_port = usb_get_serial_port_data(port); 1286 1287 if (mos7720_port == NULL) 1288 return; 1289 1290 if (!mos7720_port->open) { 1291 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1292 return; 1293 } 1294 1295 /* if we are implementing XON/XOFF, send the stop character */ 1296 if (I_IXOFF(tty)) { 1297 unsigned char stop_char = STOP_CHAR(tty); 1298 status = mos7720_write(tty, port, &stop_char, 1); 1299 if (status <= 0) 1300 return; 1301 } 1302 1303 /* if we are implementing RTS/CTS, toggle that line */ 1304 if (tty->termios.c_cflag & CRTSCTS) { 1305 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1306 write_mos_reg(port->serial, port->port_number, MCR, 1307 mos7720_port->shadowMCR); 1308 if (status != 0) 1309 return; 1310 } 1311 } 1312 1313 static void mos7720_unthrottle(struct tty_struct *tty) 1314 { 1315 struct usb_serial_port *port = tty->driver_data; 1316 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1317 int status; 1318 1319 if (mos7720_port == NULL) 1320 return; 1321 1322 if (!mos7720_port->open) { 1323 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1324 return; 1325 } 1326 1327 /* if we are implementing XON/XOFF, send the start character */ 1328 if (I_IXOFF(tty)) { 1329 unsigned char start_char = START_CHAR(tty); 1330 status = mos7720_write(tty, port, &start_char, 1); 1331 if (status <= 0) 1332 return; 1333 } 1334 1335 /* if we are implementing RTS/CTS, toggle that line */ 1336 if (tty->termios.c_cflag & CRTSCTS) { 1337 mos7720_port->shadowMCR |= UART_MCR_RTS; 1338 write_mos_reg(port->serial, port->port_number, MCR, 1339 mos7720_port->shadowMCR); 1340 if (status != 0) 1341 return; 1342 } 1343 } 1344 1345 /* FIXME: this function does not work */ 1346 static int set_higher_rates(struct moschip_port *mos7720_port, 1347 unsigned int baud) 1348 { 1349 struct usb_serial_port *port; 1350 struct usb_serial *serial; 1351 int port_number; 1352 enum mos_regs sp_reg; 1353 if (mos7720_port == NULL) 1354 return -EINVAL; 1355 1356 port = mos7720_port->port; 1357 serial = port->serial; 1358 1359 /*********************************************** 1360 * Init Sequence for higher rates 1361 ***********************************************/ 1362 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1363 port_number = port->port_number; 1364 1365 write_mos_reg(serial, port_number, IER, 0x00); 1366 write_mos_reg(serial, port_number, FCR, 0x00); 1367 write_mos_reg(serial, port_number, FCR, 0xcf); 1368 mos7720_port->shadowMCR = 0x0b; 1369 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1370 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1371 1372 /*********************************************** 1373 * Set for higher rates * 1374 ***********************************************/ 1375 /* writing baud rate verbatum into uart clock field clearly not right */ 1376 if (port_number == 0) 1377 sp_reg = SP1_REG; 1378 else 1379 sp_reg = SP2_REG; 1380 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1381 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1382 mos7720_port->shadowMCR = 0x2b; 1383 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1384 1385 /*********************************************** 1386 * Set DLL/DLM 1387 ***********************************************/ 1388 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1389 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1390 write_mos_reg(serial, port_number, DLL, 0x01); 1391 write_mos_reg(serial, port_number, DLM, 0x00); 1392 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1393 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1394 1395 return 0; 1396 } 1397 1398 /* baud rate information */ 1399 struct divisor_table_entry { 1400 __u32 baudrate; 1401 __u16 divisor; 1402 }; 1403 1404 /* Define table of divisors for moschip 7720 hardware * 1405 * These assume a 3.6864MHz crystal, the standard /16, and * 1406 * MCR.7 = 0. */ 1407 static struct divisor_table_entry divisor_table[] = { 1408 { 50, 2304}, 1409 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1410 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1411 { 150, 768}, 1412 { 300, 384}, 1413 { 600, 192}, 1414 { 1200, 96}, 1415 { 1800, 64}, 1416 { 2400, 48}, 1417 { 4800, 24}, 1418 { 7200, 16}, 1419 { 9600, 12}, 1420 { 19200, 6}, 1421 { 38400, 3}, 1422 { 57600, 2}, 1423 { 115200, 1}, 1424 }; 1425 1426 /***************************************************************************** 1427 * calc_baud_rate_divisor 1428 * this function calculates the proper baud rate divisor for the specified 1429 * baud rate. 1430 *****************************************************************************/ 1431 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1432 { 1433 int i; 1434 __u16 custom; 1435 __u16 round1; 1436 __u16 round; 1437 1438 1439 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1440 1441 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1442 if (divisor_table[i].baudrate == baudrate) { 1443 *divisor = divisor_table[i].divisor; 1444 return 0; 1445 } 1446 } 1447 1448 /* After trying for all the standard baud rates * 1449 * Try calculating the divisor for this baud rate */ 1450 if (baudrate > 75 && baudrate < 230400) { 1451 /* get the divisor */ 1452 custom = (__u16)(230400L / baudrate); 1453 1454 /* Check for round off */ 1455 round1 = (__u16)(2304000L / baudrate); 1456 round = (__u16)(round1 - (custom * 10)); 1457 if (round > 4) 1458 custom++; 1459 *divisor = custom; 1460 1461 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1462 return 0; 1463 } 1464 1465 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1466 return -EINVAL; 1467 } 1468 1469 /* 1470 * send_cmd_write_baud_rate 1471 * this function sends the proper command to change the baud rate of the 1472 * specified port. 1473 */ 1474 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1475 int baudrate) 1476 { 1477 struct usb_serial_port *port; 1478 struct usb_serial *serial; 1479 int divisor; 1480 int status; 1481 unsigned char number; 1482 1483 if (mos7720_port == NULL) 1484 return -1; 1485 1486 port = mos7720_port->port; 1487 serial = port->serial; 1488 1489 number = port->port_number; 1490 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1491 1492 /* Calculate the Divisor */ 1493 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1494 if (status) { 1495 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1496 return status; 1497 } 1498 1499 /* Enable access to divisor latch */ 1500 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1501 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1502 1503 /* Write the divisor */ 1504 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1505 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1506 1507 /* Disable access to divisor latch */ 1508 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1509 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1510 1511 return status; 1512 } 1513 1514 /* 1515 * change_port_settings 1516 * This routine is called to set the UART on the device to match 1517 * the specified new settings. 1518 */ 1519 static void change_port_settings(struct tty_struct *tty, 1520 struct moschip_port *mos7720_port, 1521 struct ktermios *old_termios) 1522 { 1523 struct usb_serial_port *port; 1524 struct usb_serial *serial; 1525 int baud; 1526 unsigned cflag; 1527 unsigned iflag; 1528 __u8 mask = 0xff; 1529 __u8 lData; 1530 __u8 lParity; 1531 __u8 lStop; 1532 int status; 1533 int port_number; 1534 1535 if (mos7720_port == NULL) 1536 return ; 1537 1538 port = mos7720_port->port; 1539 serial = port->serial; 1540 port_number = port->port_number; 1541 1542 if (!mos7720_port->open) { 1543 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1544 return; 1545 } 1546 1547 lData = UART_LCR_WLEN8; 1548 lStop = 0x00; /* 1 stop bit */ 1549 lParity = 0x00; /* No parity */ 1550 1551 cflag = tty->termios.c_cflag; 1552 iflag = tty->termios.c_iflag; 1553 1554 /* Change the number of bits */ 1555 switch (cflag & CSIZE) { 1556 case CS5: 1557 lData = UART_LCR_WLEN5; 1558 mask = 0x1f; 1559 break; 1560 1561 case CS6: 1562 lData = UART_LCR_WLEN6; 1563 mask = 0x3f; 1564 break; 1565 1566 case CS7: 1567 lData = UART_LCR_WLEN7; 1568 mask = 0x7f; 1569 break; 1570 default: 1571 case CS8: 1572 lData = UART_LCR_WLEN8; 1573 break; 1574 } 1575 1576 /* Change the Parity bit */ 1577 if (cflag & PARENB) { 1578 if (cflag & PARODD) { 1579 lParity = UART_LCR_PARITY; 1580 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1581 } else { 1582 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1583 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1584 } 1585 1586 } else { 1587 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1588 } 1589 1590 if (cflag & CMSPAR) 1591 lParity = lParity | 0x20; 1592 1593 /* Change the Stop bit */ 1594 if (cflag & CSTOPB) { 1595 lStop = UART_LCR_STOP; 1596 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1597 } else { 1598 lStop = 0x00; 1599 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1600 } 1601 1602 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1603 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1604 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1605 1606 /* Update the LCR with the correct value */ 1607 mos7720_port->shadowLCR &= 1608 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1609 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1610 1611 1612 /* Disable Interrupts */ 1613 write_mos_reg(serial, port_number, IER, 0x00); 1614 write_mos_reg(serial, port_number, FCR, 0x00); 1615 write_mos_reg(serial, port_number, FCR, 0xcf); 1616 1617 /* Send the updated LCR value to the mos7720 */ 1618 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1619 mos7720_port->shadowMCR = 0x0b; 1620 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1621 1622 /* set up the MCR register and send it to the mos7720 */ 1623 mos7720_port->shadowMCR = UART_MCR_OUT2; 1624 if (cflag & CBAUD) 1625 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1626 1627 if (cflag & CRTSCTS) { 1628 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1629 /* To set hardware flow control to the specified * 1630 * serial port, in SP1/2_CONTROL_REG */ 1631 if (port_number) 1632 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1633 else 1634 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1635 1636 } else 1637 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1638 1639 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1640 1641 /* Determine divisor based on baud rate */ 1642 baud = tty_get_baud_rate(tty); 1643 if (!baud) { 1644 /* pick a default, any default... */ 1645 dev_dbg(&port->dev, "Picked default baud...\n"); 1646 baud = 9600; 1647 } 1648 1649 if (baud >= 230400) { 1650 set_higher_rates(mos7720_port, baud); 1651 /* Enable Interrupts */ 1652 write_mos_reg(serial, port_number, IER, 0x0c); 1653 return; 1654 } 1655 1656 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1657 status = send_cmd_write_baud_rate(mos7720_port, baud); 1658 /* FIXME: needs to write actual resulting baud back not just 1659 blindly do so */ 1660 if (cflag & CBAUD) 1661 tty_encode_baud_rate(tty, baud, baud); 1662 /* Enable Interrupts */ 1663 write_mos_reg(serial, port_number, IER, 0x0c); 1664 1665 if (port->read_urb->status != -EINPROGRESS) { 1666 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1667 if (status) 1668 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1669 } 1670 } 1671 1672 /* 1673 * mos7720_set_termios 1674 * this function is called by the tty driver when it wants to change the 1675 * termios structure. 1676 */ 1677 static void mos7720_set_termios(struct tty_struct *tty, 1678 struct usb_serial_port *port, struct ktermios *old_termios) 1679 { 1680 int status; 1681 unsigned int cflag; 1682 struct usb_serial *serial; 1683 struct moschip_port *mos7720_port; 1684 1685 serial = port->serial; 1686 1687 mos7720_port = usb_get_serial_port_data(port); 1688 1689 if (mos7720_port == NULL) 1690 return; 1691 1692 if (!mos7720_port->open) { 1693 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1694 return; 1695 } 1696 1697 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1698 1699 cflag = tty->termios.c_cflag; 1700 1701 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1702 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1703 1704 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1705 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1706 1707 /* change the port settings to the new ones specified */ 1708 change_port_settings(tty, mos7720_port, old_termios); 1709 1710 if (port->read_urb->status != -EINPROGRESS) { 1711 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1712 if (status) 1713 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1714 } 1715 } 1716 1717 /* 1718 * get_lsr_info - get line status register info 1719 * 1720 * Purpose: Let user call ioctl() to get info when the UART physically 1721 * is emptied. On bus types like RS485, the transmitter must 1722 * release the bus after transmitting. This must be done when 1723 * the transmit shift register is empty, not be done when the 1724 * transmit holding register is empty. This functionality 1725 * allows an RS485 driver to be written in user space. 1726 */ 1727 static int get_lsr_info(struct tty_struct *tty, 1728 struct moschip_port *mos7720_port, unsigned int __user *value) 1729 { 1730 struct usb_serial_port *port = tty->driver_data; 1731 unsigned int result = 0; 1732 unsigned char data = 0; 1733 int port_number = port->port_number; 1734 int count; 1735 1736 count = mos7720_chars_in_buffer(tty); 1737 if (count == 0) { 1738 read_mos_reg(port->serial, port_number, LSR, &data); 1739 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1740 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1741 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1742 result = TIOCSER_TEMT; 1743 } 1744 } 1745 if (copy_to_user(value, &result, sizeof(int))) 1746 return -EFAULT; 1747 return 0; 1748 } 1749 1750 static int mos7720_tiocmget(struct tty_struct *tty) 1751 { 1752 struct usb_serial_port *port = tty->driver_data; 1753 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1754 unsigned int result = 0; 1755 unsigned int mcr ; 1756 unsigned int msr ; 1757 1758 mcr = mos7720_port->shadowMCR; 1759 msr = mos7720_port->shadowMSR; 1760 1761 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1762 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1763 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1764 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1765 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1766 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1767 1768 return result; 1769 } 1770 1771 static int mos7720_tiocmset(struct tty_struct *tty, 1772 unsigned int set, unsigned int clear) 1773 { 1774 struct usb_serial_port *port = tty->driver_data; 1775 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1776 unsigned int mcr ; 1777 1778 mcr = mos7720_port->shadowMCR; 1779 1780 if (set & TIOCM_RTS) 1781 mcr |= UART_MCR_RTS; 1782 if (set & TIOCM_DTR) 1783 mcr |= UART_MCR_DTR; 1784 if (set & TIOCM_LOOP) 1785 mcr |= UART_MCR_LOOP; 1786 1787 if (clear & TIOCM_RTS) 1788 mcr &= ~UART_MCR_RTS; 1789 if (clear & TIOCM_DTR) 1790 mcr &= ~UART_MCR_DTR; 1791 if (clear & TIOCM_LOOP) 1792 mcr &= ~UART_MCR_LOOP; 1793 1794 mos7720_port->shadowMCR = mcr; 1795 write_mos_reg(port->serial, port->port_number, MCR, 1796 mos7720_port->shadowMCR); 1797 1798 return 0; 1799 } 1800 1801 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1802 unsigned int __user *value) 1803 { 1804 unsigned int mcr; 1805 unsigned int arg; 1806 1807 struct usb_serial_port *port; 1808 1809 if (mos7720_port == NULL) 1810 return -1; 1811 1812 port = (struct usb_serial_port *)mos7720_port->port; 1813 mcr = mos7720_port->shadowMCR; 1814 1815 if (copy_from_user(&arg, value, sizeof(int))) 1816 return -EFAULT; 1817 1818 switch (cmd) { 1819 case TIOCMBIS: 1820 if (arg & TIOCM_RTS) 1821 mcr |= UART_MCR_RTS; 1822 if (arg & TIOCM_DTR) 1823 mcr |= UART_MCR_RTS; 1824 if (arg & TIOCM_LOOP) 1825 mcr |= UART_MCR_LOOP; 1826 break; 1827 1828 case TIOCMBIC: 1829 if (arg & TIOCM_RTS) 1830 mcr &= ~UART_MCR_RTS; 1831 if (arg & TIOCM_DTR) 1832 mcr &= ~UART_MCR_RTS; 1833 if (arg & TIOCM_LOOP) 1834 mcr &= ~UART_MCR_LOOP; 1835 break; 1836 1837 } 1838 1839 mos7720_port->shadowMCR = mcr; 1840 write_mos_reg(port->serial, port->port_number, MCR, 1841 mos7720_port->shadowMCR); 1842 1843 return 0; 1844 } 1845 1846 static int get_serial_info(struct moschip_port *mos7720_port, 1847 struct serial_struct __user *retinfo) 1848 { 1849 struct serial_struct tmp; 1850 1851 if (!retinfo) 1852 return -EFAULT; 1853 1854 memset(&tmp, 0, sizeof(tmp)); 1855 1856 tmp.type = PORT_16550A; 1857 tmp.line = mos7720_port->port->minor; 1858 tmp.port = mos7720_port->port->port_number; 1859 tmp.irq = 0; 1860 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1861 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1862 tmp.baud_base = 9600; 1863 tmp.close_delay = 5*HZ; 1864 tmp.closing_wait = 30*HZ; 1865 1866 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1867 return -EFAULT; 1868 return 0; 1869 } 1870 1871 static int mos7720_ioctl(struct tty_struct *tty, 1872 unsigned int cmd, unsigned long arg) 1873 { 1874 struct usb_serial_port *port = tty->driver_data; 1875 struct moschip_port *mos7720_port; 1876 1877 mos7720_port = usb_get_serial_port_data(port); 1878 if (mos7720_port == NULL) 1879 return -ENODEV; 1880 1881 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1882 1883 switch (cmd) { 1884 case TIOCSERGETLSR: 1885 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1886 return get_lsr_info(tty, mos7720_port, 1887 (unsigned int __user *)arg); 1888 1889 /* FIXME: These should be using the mode methods */ 1890 case TIOCMBIS: 1891 case TIOCMBIC: 1892 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1893 return set_modem_info(mos7720_port, cmd, 1894 (unsigned int __user *)arg); 1895 1896 case TIOCGSERIAL: 1897 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1898 return get_serial_info(mos7720_port, 1899 (struct serial_struct __user *)arg); 1900 } 1901 1902 return -ENOIOCTLCMD; 1903 } 1904 1905 static int mos7720_startup(struct usb_serial *serial) 1906 { 1907 struct usb_device *dev; 1908 char data; 1909 u16 product; 1910 int ret_val; 1911 1912 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1913 dev = serial->dev; 1914 1915 /* 1916 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1917 * port, and the second for the serial port. Because the usbserial core 1918 * assumes both pairs are serial ports, we must engage in a bit of 1919 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1920 * port 0 point to the serial port. However, both moschip devices use a 1921 * single interrupt-in endpoint for both ports (as mentioned a little 1922 * further down), and this endpoint was assigned to port 0. So after 1923 * the swap, we must copy the interrupt endpoint elements from port 1 1924 * (as newly assigned) to port 0, and null out port 1 pointers. 1925 */ 1926 if (product == MOSCHIP_DEVICE_ID_7715) { 1927 struct usb_serial_port *tmp = serial->port[0]; 1928 serial->port[0] = serial->port[1]; 1929 serial->port[1] = tmp; 1930 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1931 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1932 serial->port[0]->interrupt_in_endpointAddress = 1933 tmp->interrupt_in_endpointAddress; 1934 serial->port[1]->interrupt_in_urb = NULL; 1935 serial->port[1]->interrupt_in_buffer = NULL; 1936 } 1937 1938 /* setting configuration feature to one */ 1939 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1940 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1941 1942 /* start the interrupt urb */ 1943 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1944 if (ret_val) 1945 dev_err(&dev->dev, 1946 "%s - Error %d submitting control urb\n", 1947 __func__, ret_val); 1948 1949 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1950 if (product == MOSCHIP_DEVICE_ID_7715) { 1951 ret_val = mos7715_parport_init(serial); 1952 if (ret_val < 0) 1953 return ret_val; 1954 } 1955 #endif 1956 /* LSR For Port 1 */ 1957 read_mos_reg(serial, 0, LSR, &data); 1958 dev_dbg(&dev->dev, "LSR:%x\n", data); 1959 1960 return 0; 1961 } 1962 1963 static void mos7720_release(struct usb_serial *serial) 1964 { 1965 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1966 /* close the parallel port */ 1967 1968 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1969 == MOSCHIP_DEVICE_ID_7715) { 1970 struct urbtracker *urbtrack; 1971 unsigned long flags; 1972 struct mos7715_parport *mos_parport = 1973 usb_get_serial_data(serial); 1974 1975 /* prevent NULL ptr dereference in port callbacks */ 1976 spin_lock(&release_lock); 1977 mos_parport->pp->private_data = NULL; 1978 spin_unlock(&release_lock); 1979 1980 /* wait for synchronous usb calls to return */ 1981 if (mos_parport->msg_pending) 1982 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1983 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1984 1985 parport_remove_port(mos_parport->pp); 1986 usb_set_serial_data(serial, NULL); 1987 mos_parport->serial = NULL; 1988 1989 /* if tasklet currently scheduled, wait for it to complete */ 1990 tasklet_kill(&mos_parport->urb_tasklet); 1991 1992 /* unlink any urbs sent by the tasklet */ 1993 spin_lock_irqsave(&mos_parport->listlock, flags); 1994 list_for_each_entry(urbtrack, 1995 &mos_parport->active_urbs, 1996 urblist_entry) 1997 usb_unlink_urb(urbtrack->urb); 1998 spin_unlock_irqrestore(&mos_parport->listlock, flags); 1999 2000 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2001 } 2002 #endif 2003 } 2004 2005 static int mos7720_port_probe(struct usb_serial_port *port) 2006 { 2007 struct moschip_port *mos7720_port; 2008 2009 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2010 if (!mos7720_port) 2011 return -ENOMEM; 2012 2013 /* Initialize all port interrupt end point to port 0 int endpoint. 2014 * Our device has only one interrupt endpoint common to all ports. 2015 */ 2016 port->interrupt_in_endpointAddress = 2017 port->serial->port[0]->interrupt_in_endpointAddress; 2018 mos7720_port->port = port; 2019 2020 usb_set_serial_port_data(port, mos7720_port); 2021 2022 return 0; 2023 } 2024 2025 static int mos7720_port_remove(struct usb_serial_port *port) 2026 { 2027 struct moschip_port *mos7720_port; 2028 2029 mos7720_port = usb_get_serial_port_data(port); 2030 kfree(mos7720_port); 2031 2032 return 0; 2033 } 2034 2035 static struct usb_serial_driver moschip7720_2port_driver = { 2036 .driver = { 2037 .owner = THIS_MODULE, 2038 .name = "moschip7720", 2039 }, 2040 .description = "Moschip 2 port adapter", 2041 .id_table = id_table, 2042 .calc_num_ports = mos77xx_calc_num_ports, 2043 .open = mos7720_open, 2044 .close = mos7720_close, 2045 .throttle = mos7720_throttle, 2046 .unthrottle = mos7720_unthrottle, 2047 .probe = mos77xx_probe, 2048 .attach = mos7720_startup, 2049 .release = mos7720_release, 2050 .port_probe = mos7720_port_probe, 2051 .port_remove = mos7720_port_remove, 2052 .ioctl = mos7720_ioctl, 2053 .tiocmget = mos7720_tiocmget, 2054 .tiocmset = mos7720_tiocmset, 2055 .set_termios = mos7720_set_termios, 2056 .write = mos7720_write, 2057 .write_room = mos7720_write_room, 2058 .chars_in_buffer = mos7720_chars_in_buffer, 2059 .break_ctl = mos7720_break, 2060 .read_bulk_callback = mos7720_bulk_in_callback, 2061 .read_int_callback = NULL /* dynamically assigned in probe() */ 2062 }; 2063 2064 static struct usb_serial_driver * const serial_drivers[] = { 2065 &moschip7720_2port_driver, NULL 2066 }; 2067 2068 module_usb_serial_driver(serial_drivers, id_table); 2069 2070 MODULE_AUTHOR(DRIVER_AUTHOR); 2071 MODULE_DESCRIPTION(DRIVER_DESC); 2072 MODULE_LICENSE("GPL"); 2073