1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial converter 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/slab.h> 26 #include <linux/tty.h> 27 #include <linux/tty_driver.h> 28 #include <linux/tty_flip.h> 29 #include <linux/module.h> 30 #include <linux/spinlock.h> 31 #include <linux/serial.h> 32 #include <linux/serial_reg.h> 33 #include <linux/usb.h> 34 #include <linux/usb/serial.h> 35 #include <linux/uaccess.h> 36 #include <linux/parport.h> 37 38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 39 #define DRIVER_DESC "Moschip USB Serial Driver" 40 41 /* default urb timeout */ 42 #define MOS_WDR_TIMEOUT 5000 43 44 #define MOS_MAX_PORT 0x02 45 #define MOS_WRITE 0x0E 46 #define MOS_READ 0x0D 47 48 /* Interrupt Routines Defines */ 49 #define SERIAL_IIR_RLS 0x06 50 #define SERIAL_IIR_RDA 0x04 51 #define SERIAL_IIR_CTI 0x0c 52 #define SERIAL_IIR_THR 0x02 53 #define SERIAL_IIR_MS 0x00 54 55 #define NUM_URBS 16 /* URB Count */ 56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 57 58 /* This structure holds all of the local serial port information */ 59 struct moschip_port { 60 __u8 shadowLCR; /* last LCR value received */ 61 __u8 shadowMCR; /* last MCR value received */ 62 __u8 shadowMSR; /* last MSR value received */ 63 char open; 64 struct usb_serial_port *port; /* loop back to the owner */ 65 struct urb *write_urb_pool[NUM_URBS]; 66 }; 67 68 static struct usb_serial_driver moschip7720_2port_driver; 69 70 #define USB_VENDOR_ID_MOSCHIP 0x9710 71 #define MOSCHIP_DEVICE_ID_7720 0x7720 72 #define MOSCHIP_DEVICE_ID_7715 0x7715 73 74 static const struct usb_device_id id_table[] = { 75 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 77 { } /* terminating entry */ 78 }; 79 MODULE_DEVICE_TABLE(usb, id_table); 80 81 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 82 83 /* initial values for parport regs */ 84 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 85 #define ECR_INIT_VAL 0x00 /* SPP mode */ 86 87 struct urbtracker { 88 struct mos7715_parport *mos_parport; 89 struct list_head urblist_entry; 90 struct kref ref_count; 91 struct urb *urb; 92 struct usb_ctrlrequest *setup; 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->setup); 275 kfree(urbtrack); 276 kref_put(&mos_parport->ref_count, destroy_mos_parport); 277 } 278 279 /* 280 * This runs as a tasklet when sending an urb in a non-blocking parallel 281 * port callback had to be deferred because the disconnect mutex could not be 282 * obtained at the time. 283 */ 284 static void send_deferred_urbs(unsigned long _mos_parport) 285 { 286 int ret_val; 287 unsigned long flags; 288 struct mos7715_parport *mos_parport = (void *)_mos_parport; 289 struct urbtracker *urbtrack, *tmp; 290 struct list_head *cursor, *next; 291 struct device *dev; 292 293 /* if release function ran, game over */ 294 if (unlikely(mos_parport->serial == NULL)) 295 return; 296 297 dev = &mos_parport->serial->dev->dev; 298 299 /* try again to get the mutex */ 300 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 301 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 302 tasklet_schedule(&mos_parport->urb_tasklet); 303 return; 304 } 305 306 /* if device disconnected, game over */ 307 if (unlikely(mos_parport->serial->disconnected)) { 308 mutex_unlock(&mos_parport->serial->disc_mutex); 309 return; 310 } 311 312 spin_lock_irqsave(&mos_parport->listlock, flags); 313 if (list_empty(&mos_parport->deferred_urbs)) { 314 spin_unlock_irqrestore(&mos_parport->listlock, flags); 315 mutex_unlock(&mos_parport->serial->disc_mutex); 316 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 317 return; 318 } 319 320 /* move contents of deferred_urbs list to active_urbs list and submit */ 321 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 322 list_move_tail(cursor, &mos_parport->active_urbs); 323 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 324 urblist_entry) { 325 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 326 dev_dbg(dev, "%s: urb submitted\n", __func__); 327 if (ret_val) { 328 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 329 list_del(&urbtrack->urblist_entry); 330 kref_put(&urbtrack->ref_count, destroy_urbtracker); 331 } 332 } 333 spin_unlock_irqrestore(&mos_parport->listlock, flags); 334 mutex_unlock(&mos_parport->serial->disc_mutex); 335 } 336 337 /* callback for parallel port control urbs submitted asynchronously */ 338 static void async_complete(struct urb *urb) 339 { 340 struct urbtracker *urbtrack = urb->context; 341 int status = urb->status; 342 343 if (unlikely(status)) 344 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 345 346 /* remove the urbtracker from the active_urbs list */ 347 spin_lock(&urbtrack->mos_parport->listlock); 348 list_del(&urbtrack->urblist_entry); 349 spin_unlock(&urbtrack->mos_parport->listlock); 350 kref_put(&urbtrack->ref_count, destroy_urbtracker); 351 } 352 353 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 354 enum mos_regs reg, __u8 data) 355 { 356 struct urbtracker *urbtrack; 357 int ret_val; 358 unsigned long flags; 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) 365 return -ENOMEM; 366 367 kref_get(&mos_parport->ref_count); 368 urbtrack->mos_parport = mos_parport; 369 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 370 if (!urbtrack->urb) { 371 kfree(urbtrack); 372 return -ENOMEM; 373 } 374 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC); 375 if (!urbtrack->setup) { 376 usb_free_urb(urbtrack->urb); 377 kfree(urbtrack); 378 return -ENOMEM; 379 } 380 urbtrack->setup->bRequestType = (__u8)0x40; 381 urbtrack->setup->bRequest = (__u8)0x0e; 382 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy)); 383 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg)); 384 urbtrack->setup->wLength = 0; 385 usb_fill_control_urb(urbtrack->urb, usbdev, 386 usb_sndctrlpipe(usbdev, 0), 387 (unsigned char *)urbtrack->setup, 388 NULL, 0, async_complete, urbtrack); 389 kref_init(&urbtrack->ref_count); 390 INIT_LIST_HEAD(&urbtrack->urblist_entry); 391 392 /* 393 * get the disconnect mutex, or add tracker to the deferred_urbs list 394 * and schedule a tasklet to try again later 395 */ 396 if (!mutex_trylock(&serial->disc_mutex)) { 397 spin_lock_irqsave(&mos_parport->listlock, flags); 398 list_add_tail(&urbtrack->urblist_entry, 399 &mos_parport->deferred_urbs); 400 spin_unlock_irqrestore(&mos_parport->listlock, flags); 401 tasklet_schedule(&mos_parport->urb_tasklet); 402 dev_dbg(&usbdev->dev, "tasklet scheduled"); 403 return 0; 404 } 405 406 /* bail if device disconnected */ 407 if (serial->disconnected) { 408 kref_put(&urbtrack->ref_count, destroy_urbtracker); 409 mutex_unlock(&serial->disc_mutex); 410 return -ENODEV; 411 } 412 413 /* add the tracker to the active_urbs list and submit */ 414 spin_lock_irqsave(&mos_parport->listlock, flags); 415 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 416 spin_unlock_irqrestore(&mos_parport->listlock, flags); 417 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 418 mutex_unlock(&serial->disc_mutex); 419 if (ret_val) { 420 dev_err(&usbdev->dev, 421 "%s: submit_urb() failed: %d", __func__, ret_val); 422 spin_lock_irqsave(&mos_parport->listlock, flags); 423 list_del(&urbtrack->urblist_entry); 424 spin_unlock_irqrestore(&mos_parport->listlock, flags); 425 kref_put(&urbtrack->ref_count, destroy_urbtracker); 426 return ret_val; 427 } 428 return 0; 429 } 430 431 /* 432 * This is the the common top part of all parallel port callback operations that 433 * send synchronous messages to the device. This implements convoluted locking 434 * that avoids two scenarios: (1) a port operation is called after usbserial 435 * has called our release function, at which point struct mos7715_parport has 436 * been destroyed, and (2) the device has been disconnected, but usbserial has 437 * not called the release function yet because someone has a serial port open. 438 * The shared release_lock prevents the first, and the mutex and disconnected 439 * flag maintained by usbserial covers the second. We also use the msg_pending 440 * flag to ensure that all synchronous usb message calls have completed before 441 * our release function can return. 442 */ 443 static int parport_prologue(struct parport *pp) 444 { 445 struct mos7715_parport *mos_parport; 446 447 spin_lock(&release_lock); 448 mos_parport = pp->private_data; 449 if (unlikely(mos_parport == NULL)) { 450 /* release fn called, port struct destroyed */ 451 spin_unlock(&release_lock); 452 return -1; 453 } 454 mos_parport->msg_pending = true; /* synch usb call pending */ 455 reinit_completion(&mos_parport->syncmsg_compl); 456 spin_unlock(&release_lock); 457 458 mutex_lock(&mos_parport->serial->disc_mutex); 459 if (mos_parport->serial->disconnected) { 460 /* device disconnected */ 461 mutex_unlock(&mos_parport->serial->disc_mutex); 462 mos_parport->msg_pending = false; 463 complete(&mos_parport->syncmsg_compl); 464 return -1; 465 } 466 467 return 0; 468 } 469 470 /* 471 * This is the common bottom part of all parallel port functions that send 472 * synchronous messages to the device. 473 */ 474 static inline void parport_epilogue(struct parport *pp) 475 { 476 struct mos7715_parport *mos_parport = pp->private_data; 477 mutex_unlock(&mos_parport->serial->disc_mutex); 478 mos_parport->msg_pending = false; 479 complete(&mos_parport->syncmsg_compl); 480 } 481 482 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 483 { 484 struct mos7715_parport *mos_parport = pp->private_data; 485 486 if (parport_prologue(pp) < 0) 487 return; 488 mos7715_change_mode(mos_parport, SPP); 489 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 490 parport_epilogue(pp); 491 } 492 493 static unsigned char parport_mos7715_read_data(struct parport *pp) 494 { 495 struct mos7715_parport *mos_parport = pp->private_data; 496 unsigned char d; 497 498 if (parport_prologue(pp) < 0) 499 return 0; 500 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 501 parport_epilogue(pp); 502 return d; 503 } 504 505 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 506 { 507 struct mos7715_parport *mos_parport = pp->private_data; 508 __u8 data; 509 510 if (parport_prologue(pp) < 0) 511 return; 512 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 513 write_mos_reg(mos_parport->serial, dummy, DCR, data); 514 mos_parport->shadowDCR = data; 515 parport_epilogue(pp); 516 } 517 518 static unsigned char parport_mos7715_read_control(struct parport *pp) 519 { 520 struct mos7715_parport *mos_parport = pp->private_data; 521 __u8 dcr; 522 523 spin_lock(&release_lock); 524 mos_parport = pp->private_data; 525 if (unlikely(mos_parport == NULL)) { 526 spin_unlock(&release_lock); 527 return 0; 528 } 529 dcr = mos_parport->shadowDCR & 0x0f; 530 spin_unlock(&release_lock); 531 return dcr; 532 } 533 534 static unsigned char parport_mos7715_frob_control(struct parport *pp, 535 unsigned char mask, 536 unsigned char val) 537 { 538 struct mos7715_parport *mos_parport = pp->private_data; 539 __u8 dcr; 540 541 mask &= 0x0f; 542 val &= 0x0f; 543 if (parport_prologue(pp) < 0) 544 return 0; 545 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 546 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 547 dcr = mos_parport->shadowDCR & 0x0f; 548 parport_epilogue(pp); 549 return dcr; 550 } 551 552 static unsigned char parport_mos7715_read_status(struct parport *pp) 553 { 554 unsigned char status; 555 struct mos7715_parport *mos_parport = pp->private_data; 556 557 spin_lock(&release_lock); 558 mos_parport = pp->private_data; 559 if (unlikely(mos_parport == NULL)) { /* release called */ 560 spin_unlock(&release_lock); 561 return 0; 562 } 563 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 564 spin_unlock(&release_lock); 565 return status; 566 } 567 568 static void parport_mos7715_enable_irq(struct parport *pp) 569 { 570 } 571 572 static void parport_mos7715_disable_irq(struct parport *pp) 573 { 574 } 575 576 static void parport_mos7715_data_forward(struct parport *pp) 577 { 578 struct mos7715_parport *mos_parport = pp->private_data; 579 580 if (parport_prologue(pp) < 0) 581 return; 582 mos7715_change_mode(mos_parport, PS2); 583 mos_parport->shadowDCR &= ~0x20; 584 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 585 parport_epilogue(pp); 586 } 587 588 static void parport_mos7715_data_reverse(struct parport *pp) 589 { 590 struct mos7715_parport *mos_parport = pp->private_data; 591 592 if (parport_prologue(pp) < 0) 593 return; 594 mos7715_change_mode(mos_parport, PS2); 595 mos_parport->shadowDCR |= 0x20; 596 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 597 parport_epilogue(pp); 598 } 599 600 static void parport_mos7715_init_state(struct pardevice *dev, 601 struct parport_state *s) 602 { 603 s->u.pc.ctr = DCR_INIT_VAL; 604 s->u.pc.ecr = ECR_INIT_VAL; 605 } 606 607 /* N.B. Parport core code requires that this function not block */ 608 static void parport_mos7715_save_state(struct parport *pp, 609 struct parport_state *s) 610 { 611 struct mos7715_parport *mos_parport; 612 613 spin_lock(&release_lock); 614 mos_parport = pp->private_data; 615 if (unlikely(mos_parport == NULL)) { /* release called */ 616 spin_unlock(&release_lock); 617 return; 618 } 619 s->u.pc.ctr = mos_parport->shadowDCR; 620 s->u.pc.ecr = mos_parport->shadowECR; 621 spin_unlock(&release_lock); 622 } 623 624 /* N.B. Parport core code requires that this function not block */ 625 static void parport_mos7715_restore_state(struct parport *pp, 626 struct parport_state *s) 627 { 628 struct mos7715_parport *mos_parport; 629 630 spin_lock(&release_lock); 631 mos_parport = pp->private_data; 632 if (unlikely(mos_parport == NULL)) { /* release called */ 633 spin_unlock(&release_lock); 634 return; 635 } 636 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 637 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 638 spin_unlock(&release_lock); 639 } 640 641 static size_t parport_mos7715_write_compat(struct parport *pp, 642 const void *buffer, 643 size_t len, int flags) 644 { 645 int retval; 646 struct mos7715_parport *mos_parport = pp->private_data; 647 int actual_len; 648 649 if (parport_prologue(pp) < 0) 650 return 0; 651 mos7715_change_mode(mos_parport, PPF); 652 retval = usb_bulk_msg(mos_parport->serial->dev, 653 usb_sndbulkpipe(mos_parport->serial->dev, 2), 654 (void *)buffer, len, &actual_len, 655 MOS_WDR_TIMEOUT); 656 parport_epilogue(pp); 657 if (retval) { 658 dev_err(&mos_parport->serial->dev->dev, 659 "mos7720: usb_bulk_msg() failed: %d", retval); 660 return 0; 661 } 662 return actual_len; 663 } 664 665 static struct parport_operations parport_mos7715_ops = { 666 .owner = THIS_MODULE, 667 .write_data = parport_mos7715_write_data, 668 .read_data = parport_mos7715_read_data, 669 670 .write_control = parport_mos7715_write_control, 671 .read_control = parport_mos7715_read_control, 672 .frob_control = parport_mos7715_frob_control, 673 674 .read_status = parport_mos7715_read_status, 675 676 .enable_irq = parport_mos7715_enable_irq, 677 .disable_irq = parport_mos7715_disable_irq, 678 679 .data_forward = parport_mos7715_data_forward, 680 .data_reverse = parport_mos7715_data_reverse, 681 682 .init_state = parport_mos7715_init_state, 683 .save_state = parport_mos7715_save_state, 684 .restore_state = parport_mos7715_restore_state, 685 686 .compat_write_data = parport_mos7715_write_compat, 687 688 .nibble_read_data = parport_ieee1284_read_nibble, 689 .byte_read_data = parport_ieee1284_read_byte, 690 }; 691 692 /* 693 * Allocate and initialize parallel port control struct, initialize 694 * the parallel port hardware device, and register with the parport subsystem. 695 */ 696 static int mos7715_parport_init(struct usb_serial *serial) 697 { 698 struct mos7715_parport *mos_parport; 699 700 /* allocate and initialize parallel port control struct */ 701 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 702 if (!mos_parport) 703 return -ENOMEM; 704 705 mos_parport->msg_pending = false; 706 kref_init(&mos_parport->ref_count); 707 spin_lock_init(&mos_parport->listlock); 708 INIT_LIST_HEAD(&mos_parport->active_urbs); 709 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 710 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 711 mos_parport->serial = serial; 712 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 713 (unsigned long) mos_parport); 714 init_completion(&mos_parport->syncmsg_compl); 715 716 /* cycle parallel port reset bit */ 717 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 718 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 719 720 /* initialize device registers */ 721 mos_parport->shadowDCR = DCR_INIT_VAL; 722 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 723 mos_parport->shadowECR = ECR_INIT_VAL; 724 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 725 726 /* register with parport core */ 727 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 728 PARPORT_DMA_NONE, 729 &parport_mos7715_ops); 730 if (mos_parport->pp == NULL) { 731 dev_err(&serial->interface->dev, 732 "Could not register parport\n"); 733 kref_put(&mos_parport->ref_count, destroy_mos_parport); 734 return -EIO; 735 } 736 mos_parport->pp->private_data = mos_parport; 737 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 738 mos_parport->pp->dev = &serial->interface->dev; 739 parport_announce_port(mos_parport->pp); 740 741 return 0; 742 } 743 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 744 745 /* 746 * mos7720_interrupt_callback 747 * this is the callback function for when we have received data on the 748 * interrupt endpoint. 749 */ 750 static void mos7720_interrupt_callback(struct urb *urb) 751 { 752 int result; 753 int length; 754 int status = urb->status; 755 struct device *dev = &urb->dev->dev; 756 __u8 *data; 757 __u8 sp1; 758 __u8 sp2; 759 760 switch (status) { 761 case 0: 762 /* success */ 763 break; 764 case -ECONNRESET: 765 case -ENOENT: 766 case -ESHUTDOWN: 767 /* this urb is terminated, clean up */ 768 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 769 return; 770 default: 771 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 772 goto exit; 773 } 774 775 length = urb->actual_length; 776 data = urb->transfer_buffer; 777 778 /* Moschip get 4 bytes 779 * Byte 1 IIR Port 1 (port.number is 0) 780 * Byte 2 IIR Port 2 (port.number is 1) 781 * Byte 3 -------------- 782 * Byte 4 FIFO status for both */ 783 784 /* the above description is inverted 785 * oneukum 2007-03-14 */ 786 787 if (unlikely(length != 4)) { 788 dev_dbg(dev, "Wrong data !!!\n"); 789 return; 790 } 791 792 sp1 = data[3]; 793 sp2 = data[2]; 794 795 if ((sp1 | sp2) & 0x01) { 796 /* No Interrupt Pending in both the ports */ 797 dev_dbg(dev, "No Interrupt !!!\n"); 798 } else { 799 switch (sp1 & 0x0f) { 800 case SERIAL_IIR_RLS: 801 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 802 break; 803 case SERIAL_IIR_CTI: 804 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 805 break; 806 case SERIAL_IIR_MS: 807 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 808 break; 809 } 810 811 switch (sp2 & 0x0f) { 812 case SERIAL_IIR_RLS: 813 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 814 break; 815 case SERIAL_IIR_CTI: 816 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 817 break; 818 case SERIAL_IIR_MS: 819 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 820 break; 821 } 822 } 823 824 exit: 825 result = usb_submit_urb(urb, GFP_ATOMIC); 826 if (result) 827 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 828 } 829 830 /* 831 * mos7715_interrupt_callback 832 * this is the 7715's callback function for when we have received data on 833 * the interrupt endpoint. 834 */ 835 static void mos7715_interrupt_callback(struct urb *urb) 836 { 837 int result; 838 int length; 839 int status = urb->status; 840 struct device *dev = &urb->dev->dev; 841 __u8 *data; 842 __u8 iir; 843 844 switch (status) { 845 case 0: 846 /* success */ 847 break; 848 case -ECONNRESET: 849 case -ENOENT: 850 case -ESHUTDOWN: 851 case -ENODEV: 852 /* this urb is terminated, clean up */ 853 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 854 return; 855 default: 856 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 857 goto exit; 858 } 859 860 length = urb->actual_length; 861 data = urb->transfer_buffer; 862 863 /* Structure of data from 7715 device: 864 * Byte 1: IIR serial Port 865 * Byte 2: unused 866 * Byte 2: DSR parallel port 867 * Byte 4: FIFO status for both */ 868 869 if (unlikely(length != 4)) { 870 dev_dbg(dev, "Wrong data !!!\n"); 871 return; 872 } 873 874 iir = data[0]; 875 if (!(iir & 0x01)) { /* serial port interrupt pending */ 876 switch (iir & 0x0f) { 877 case SERIAL_IIR_RLS: 878 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n"); 879 break; 880 case SERIAL_IIR_CTI: 881 dev_dbg(dev, "Serial Port: Receiver time out\n"); 882 break; 883 case SERIAL_IIR_MS: 884 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 885 break; 886 } 887 } 888 889 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 890 { /* update local copy of DSR reg */ 891 struct usb_serial_port *port = urb->context; 892 struct mos7715_parport *mos_parport = port->serial->private; 893 if (unlikely(mos_parport == NULL)) 894 return; 895 atomic_set(&mos_parport->shadowDSR, data[2]); 896 } 897 #endif 898 899 exit: 900 result = usb_submit_urb(urb, GFP_ATOMIC); 901 if (result) 902 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 903 } 904 905 /* 906 * mos7720_bulk_in_callback 907 * this is the callback function for when we have received data on the 908 * bulk in endpoint. 909 */ 910 static void mos7720_bulk_in_callback(struct urb *urb) 911 { 912 int retval; 913 unsigned char *data ; 914 struct usb_serial_port *port; 915 int status = urb->status; 916 917 if (status) { 918 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 919 return; 920 } 921 922 port = urb->context; 923 924 dev_dbg(&port->dev, "Entering...%s\n", __func__); 925 926 data = urb->transfer_buffer; 927 928 if (urb->actual_length) { 929 tty_insert_flip_string(&port->port, data, urb->actual_length); 930 tty_flip_buffer_push(&port->port); 931 } 932 933 if (port->read_urb->status != -EINPROGRESS) { 934 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 935 if (retval) 936 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 937 } 938 } 939 940 /* 941 * mos7720_bulk_out_data_callback 942 * this is the callback function for when we have finished sending serial 943 * data on the bulk out endpoint. 944 */ 945 static void mos7720_bulk_out_data_callback(struct urb *urb) 946 { 947 struct moschip_port *mos7720_port; 948 int status = urb->status; 949 950 if (status) { 951 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 952 return; 953 } 954 955 mos7720_port = urb->context; 956 if (!mos7720_port) { 957 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 958 return ; 959 } 960 961 if (mos7720_port->open) 962 tty_port_tty_wakeup(&mos7720_port->port->port); 963 } 964 965 /* 966 * mos77xx_probe 967 * this function installs the appropriate read interrupt endpoint callback 968 * depending on whether the device is a 7720 or 7715, thus avoiding costly 969 * run-time checks in the high-frequency callback routine itself. 970 */ 971 static int mos77xx_probe(struct usb_serial *serial, 972 const struct usb_device_id *id) 973 { 974 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 975 moschip7720_2port_driver.read_int_callback = 976 mos7715_interrupt_callback; 977 else 978 moschip7720_2port_driver.read_int_callback = 979 mos7720_interrupt_callback; 980 981 return 0; 982 } 983 984 static int mos77xx_calc_num_ports(struct usb_serial *serial) 985 { 986 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 987 if (product == MOSCHIP_DEVICE_ID_7715) 988 return 1; 989 990 return 2; 991 } 992 993 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 994 { 995 struct usb_serial *serial; 996 struct urb *urb; 997 struct moschip_port *mos7720_port; 998 int response; 999 int port_number; 1000 __u8 data; 1001 int allocated_urbs = 0; 1002 int j; 1003 1004 serial = port->serial; 1005 1006 mos7720_port = usb_get_serial_port_data(port); 1007 if (mos7720_port == NULL) 1008 return -ENODEV; 1009 1010 usb_clear_halt(serial->dev, port->write_urb->pipe); 1011 usb_clear_halt(serial->dev, port->read_urb->pipe); 1012 1013 /* Initialising the write urb pool */ 1014 for (j = 0; j < NUM_URBS; ++j) { 1015 urb = usb_alloc_urb(0, GFP_KERNEL); 1016 mos7720_port->write_urb_pool[j] = urb; 1017 if (!urb) 1018 continue; 1019 1020 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1021 GFP_KERNEL); 1022 if (!urb->transfer_buffer) { 1023 usb_free_urb(mos7720_port->write_urb_pool[j]); 1024 mos7720_port->write_urb_pool[j] = NULL; 1025 continue; 1026 } 1027 allocated_urbs++; 1028 } 1029 1030 if (!allocated_urbs) 1031 return -ENOMEM; 1032 1033 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1034 * 1035 * Register Index 1036 * 0 : THR/RHR 1037 * 1 : IER 1038 * 2 : FCR 1039 * 3 : LCR 1040 * 4 : MCR 1041 * 5 : LSR 1042 * 6 : MSR 1043 * 7 : SPR 1044 * 1045 * 0x08 : SP1/2 Control Reg 1046 */ 1047 port_number = port->port_number; 1048 read_mos_reg(serial, port_number, LSR, &data); 1049 1050 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1051 1052 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1053 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1054 1055 write_mos_reg(serial, port_number, IER, 0x00); 1056 write_mos_reg(serial, port_number, FCR, 0x00); 1057 1058 write_mos_reg(serial, port_number, FCR, 0xcf); 1059 mos7720_port->shadowLCR = 0x03; 1060 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1061 mos7720_port->shadowMCR = 0x0b; 1062 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1063 1064 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1065 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1066 data = data | (port->port_number + 1); 1067 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1068 mos7720_port->shadowLCR = 0x83; 1069 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1070 write_mos_reg(serial, port_number, THR, 0x0c); 1071 write_mos_reg(serial, port_number, IER, 0x00); 1072 mos7720_port->shadowLCR = 0x03; 1073 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1074 write_mos_reg(serial, port_number, IER, 0x0c); 1075 1076 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1077 if (response) 1078 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1079 __func__, response); 1080 1081 /* initialize our port settings */ 1082 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1083 1084 /* send a open port command */ 1085 mos7720_port->open = 1; 1086 1087 return 0; 1088 } 1089 1090 /* 1091 * mos7720_chars_in_buffer 1092 * this function is called by the tty driver when it wants to know how many 1093 * bytes of data we currently have outstanding in the port (data that has 1094 * been written, but hasn't made it out the port yet) 1095 * If successful, we return the number of bytes left to be written in the 1096 * system, 1097 * Otherwise we return a negative error number. 1098 */ 1099 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1100 { 1101 struct usb_serial_port *port = tty->driver_data; 1102 int i; 1103 int chars = 0; 1104 struct moschip_port *mos7720_port; 1105 1106 mos7720_port = usb_get_serial_port_data(port); 1107 if (mos7720_port == NULL) 1108 return 0; 1109 1110 for (i = 0; i < NUM_URBS; ++i) { 1111 if (mos7720_port->write_urb_pool[i] && 1112 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1113 chars += URB_TRANSFER_BUFFER_SIZE; 1114 } 1115 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1116 return chars; 1117 } 1118 1119 static void mos7720_close(struct usb_serial_port *port) 1120 { 1121 struct usb_serial *serial; 1122 struct moschip_port *mos7720_port; 1123 int j; 1124 1125 serial = port->serial; 1126 1127 mos7720_port = usb_get_serial_port_data(port); 1128 if (mos7720_port == NULL) 1129 return; 1130 1131 for (j = 0; j < NUM_URBS; ++j) 1132 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1133 1134 /* Freeing Write URBs */ 1135 for (j = 0; j < NUM_URBS; ++j) { 1136 if (mos7720_port->write_urb_pool[j]) { 1137 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1138 usb_free_urb(mos7720_port->write_urb_pool[j]); 1139 } 1140 } 1141 1142 /* While closing port, shutdown all bulk read, write * 1143 * and interrupt read if they exists, otherwise nop */ 1144 usb_kill_urb(port->write_urb); 1145 usb_kill_urb(port->read_urb); 1146 1147 write_mos_reg(serial, port->port_number, MCR, 0x00); 1148 write_mos_reg(serial, port->port_number, IER, 0x00); 1149 1150 mos7720_port->open = 0; 1151 } 1152 1153 static void mos7720_break(struct tty_struct *tty, int break_state) 1154 { 1155 struct usb_serial_port *port = tty->driver_data; 1156 unsigned char data; 1157 struct usb_serial *serial; 1158 struct moschip_port *mos7720_port; 1159 1160 serial = port->serial; 1161 1162 mos7720_port = usb_get_serial_port_data(port); 1163 if (mos7720_port == NULL) 1164 return; 1165 1166 if (break_state == -1) 1167 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1168 else 1169 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1170 1171 mos7720_port->shadowLCR = data; 1172 write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR); 1173 } 1174 1175 /* 1176 * mos7720_write_room 1177 * this function is called by the tty driver when it wants to know how many 1178 * bytes of data we can accept for a specific port. 1179 * If successful, we return the amount of room that we have for this port 1180 * Otherwise we return a negative error number. 1181 */ 1182 static int mos7720_write_room(struct tty_struct *tty) 1183 { 1184 struct usb_serial_port *port = tty->driver_data; 1185 struct moschip_port *mos7720_port; 1186 int room = 0; 1187 int i; 1188 1189 mos7720_port = usb_get_serial_port_data(port); 1190 if (mos7720_port == NULL) 1191 return -ENODEV; 1192 1193 /* FIXME: Locking */ 1194 for (i = 0; i < NUM_URBS; ++i) { 1195 if (mos7720_port->write_urb_pool[i] && 1196 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1197 room += URB_TRANSFER_BUFFER_SIZE; 1198 } 1199 1200 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1201 return room; 1202 } 1203 1204 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1205 const unsigned char *data, int count) 1206 { 1207 int status; 1208 int i; 1209 int bytes_sent = 0; 1210 int transfer_size; 1211 1212 struct moschip_port *mos7720_port; 1213 struct usb_serial *serial; 1214 struct urb *urb; 1215 const unsigned char *current_position = data; 1216 1217 serial = port->serial; 1218 1219 mos7720_port = usb_get_serial_port_data(port); 1220 if (mos7720_port == NULL) 1221 return -ENODEV; 1222 1223 /* try to find a free urb in the list */ 1224 urb = NULL; 1225 1226 for (i = 0; i < NUM_URBS; ++i) { 1227 if (mos7720_port->write_urb_pool[i] && 1228 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1229 urb = mos7720_port->write_urb_pool[i]; 1230 dev_dbg(&port->dev, "URB:%d\n", i); 1231 break; 1232 } 1233 } 1234 1235 if (urb == NULL) { 1236 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1237 goto exit; 1238 } 1239 1240 if (urb->transfer_buffer == NULL) { 1241 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1242 GFP_KERNEL); 1243 if (!urb->transfer_buffer) 1244 goto exit; 1245 } 1246 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1247 1248 memcpy(urb->transfer_buffer, current_position, transfer_size); 1249 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1250 urb->transfer_buffer); 1251 1252 /* fill urb with data and submit */ 1253 usb_fill_bulk_urb(urb, serial->dev, 1254 usb_sndbulkpipe(serial->dev, 1255 port->bulk_out_endpointAddress), 1256 urb->transfer_buffer, transfer_size, 1257 mos7720_bulk_out_data_callback, mos7720_port); 1258 1259 /* send it down the pipe */ 1260 status = usb_submit_urb(urb, GFP_ATOMIC); 1261 if (status) { 1262 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1263 "with status = %d\n", __func__, status); 1264 bytes_sent = status; 1265 goto exit; 1266 } 1267 bytes_sent = transfer_size; 1268 1269 exit: 1270 return bytes_sent; 1271 } 1272 1273 static void mos7720_throttle(struct tty_struct *tty) 1274 { 1275 struct usb_serial_port *port = tty->driver_data; 1276 struct moschip_port *mos7720_port; 1277 int status; 1278 1279 mos7720_port = usb_get_serial_port_data(port); 1280 1281 if (mos7720_port == NULL) 1282 return; 1283 1284 if (!mos7720_port->open) { 1285 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1286 return; 1287 } 1288 1289 /* if we are implementing XON/XOFF, send the stop character */ 1290 if (I_IXOFF(tty)) { 1291 unsigned char stop_char = STOP_CHAR(tty); 1292 status = mos7720_write(tty, port, &stop_char, 1); 1293 if (status <= 0) 1294 return; 1295 } 1296 1297 /* if we are implementing RTS/CTS, toggle that line */ 1298 if (tty->termios.c_cflag & CRTSCTS) { 1299 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1300 write_mos_reg(port->serial, port->port_number, MCR, 1301 mos7720_port->shadowMCR); 1302 if (status != 0) 1303 return; 1304 } 1305 } 1306 1307 static void mos7720_unthrottle(struct tty_struct *tty) 1308 { 1309 struct usb_serial_port *port = tty->driver_data; 1310 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1311 int status; 1312 1313 if (mos7720_port == NULL) 1314 return; 1315 1316 if (!mos7720_port->open) { 1317 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1318 return; 1319 } 1320 1321 /* if we are implementing XON/XOFF, send the start character */ 1322 if (I_IXOFF(tty)) { 1323 unsigned char start_char = START_CHAR(tty); 1324 status = mos7720_write(tty, port, &start_char, 1); 1325 if (status <= 0) 1326 return; 1327 } 1328 1329 /* if we are implementing RTS/CTS, toggle that line */ 1330 if (tty->termios.c_cflag & CRTSCTS) { 1331 mos7720_port->shadowMCR |= UART_MCR_RTS; 1332 write_mos_reg(port->serial, port->port_number, MCR, 1333 mos7720_port->shadowMCR); 1334 if (status != 0) 1335 return; 1336 } 1337 } 1338 1339 /* FIXME: this function does not work */ 1340 static int set_higher_rates(struct moschip_port *mos7720_port, 1341 unsigned int baud) 1342 { 1343 struct usb_serial_port *port; 1344 struct usb_serial *serial; 1345 int port_number; 1346 enum mos_regs sp_reg; 1347 if (mos7720_port == NULL) 1348 return -EINVAL; 1349 1350 port = mos7720_port->port; 1351 serial = port->serial; 1352 1353 /*********************************************** 1354 * Init Sequence for higher rates 1355 ***********************************************/ 1356 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1357 port_number = port->port_number; 1358 1359 write_mos_reg(serial, port_number, IER, 0x00); 1360 write_mos_reg(serial, port_number, FCR, 0x00); 1361 write_mos_reg(serial, port_number, FCR, 0xcf); 1362 mos7720_port->shadowMCR = 0x0b; 1363 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1364 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1365 1366 /*********************************************** 1367 * Set for higher rates * 1368 ***********************************************/ 1369 /* writing baud rate verbatum into uart clock field clearly not right */ 1370 if (port_number == 0) 1371 sp_reg = SP1_REG; 1372 else 1373 sp_reg = SP2_REG; 1374 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1375 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1376 mos7720_port->shadowMCR = 0x2b; 1377 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1378 1379 /*********************************************** 1380 * Set DLL/DLM 1381 ***********************************************/ 1382 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1383 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1384 write_mos_reg(serial, port_number, DLL, 0x01); 1385 write_mos_reg(serial, port_number, DLM, 0x00); 1386 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1387 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1388 1389 return 0; 1390 } 1391 1392 /* baud rate information */ 1393 struct divisor_table_entry { 1394 __u32 baudrate; 1395 __u16 divisor; 1396 }; 1397 1398 /* Define table of divisors for moschip 7720 hardware * 1399 * These assume a 3.6864MHz crystal, the standard /16, and * 1400 * MCR.7 = 0. */ 1401 static struct divisor_table_entry divisor_table[] = { 1402 { 50, 2304}, 1403 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1404 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1405 { 150, 768}, 1406 { 300, 384}, 1407 { 600, 192}, 1408 { 1200, 96}, 1409 { 1800, 64}, 1410 { 2400, 48}, 1411 { 4800, 24}, 1412 { 7200, 16}, 1413 { 9600, 12}, 1414 { 19200, 6}, 1415 { 38400, 3}, 1416 { 57600, 2}, 1417 { 115200, 1}, 1418 }; 1419 1420 /***************************************************************************** 1421 * calc_baud_rate_divisor 1422 * this function calculates the proper baud rate divisor for the specified 1423 * baud rate. 1424 *****************************************************************************/ 1425 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1426 { 1427 int i; 1428 __u16 custom; 1429 __u16 round1; 1430 __u16 round; 1431 1432 1433 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1434 1435 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1436 if (divisor_table[i].baudrate == baudrate) { 1437 *divisor = divisor_table[i].divisor; 1438 return 0; 1439 } 1440 } 1441 1442 /* After trying for all the standard baud rates * 1443 * Try calculating the divisor for this baud rate */ 1444 if (baudrate > 75 && baudrate < 230400) { 1445 /* get the divisor */ 1446 custom = (__u16)(230400L / baudrate); 1447 1448 /* Check for round off */ 1449 round1 = (__u16)(2304000L / baudrate); 1450 round = (__u16)(round1 - (custom * 10)); 1451 if (round > 4) 1452 custom++; 1453 *divisor = custom; 1454 1455 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1456 return 0; 1457 } 1458 1459 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1460 return -EINVAL; 1461 } 1462 1463 /* 1464 * send_cmd_write_baud_rate 1465 * this function sends the proper command to change the baud rate of the 1466 * specified port. 1467 */ 1468 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1469 int baudrate) 1470 { 1471 struct usb_serial_port *port; 1472 struct usb_serial *serial; 1473 int divisor; 1474 int status; 1475 unsigned char number; 1476 1477 if (mos7720_port == NULL) 1478 return -1; 1479 1480 port = mos7720_port->port; 1481 serial = port->serial; 1482 1483 number = port->port_number; 1484 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1485 1486 /* Calculate the Divisor */ 1487 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1488 if (status) { 1489 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1490 return status; 1491 } 1492 1493 /* Enable access to divisor latch */ 1494 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1495 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1496 1497 /* Write the divisor */ 1498 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1499 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1500 1501 /* Disable access to divisor latch */ 1502 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1503 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1504 1505 return status; 1506 } 1507 1508 /* 1509 * change_port_settings 1510 * This routine is called to set the UART on the device to match 1511 * the specified new settings. 1512 */ 1513 static void change_port_settings(struct tty_struct *tty, 1514 struct moschip_port *mos7720_port, 1515 struct ktermios *old_termios) 1516 { 1517 struct usb_serial_port *port; 1518 struct usb_serial *serial; 1519 int baud; 1520 unsigned cflag; 1521 unsigned iflag; 1522 __u8 mask = 0xff; 1523 __u8 lData; 1524 __u8 lParity; 1525 __u8 lStop; 1526 int status; 1527 int port_number; 1528 1529 if (mos7720_port == NULL) 1530 return ; 1531 1532 port = mos7720_port->port; 1533 serial = port->serial; 1534 port_number = port->port_number; 1535 1536 if (!mos7720_port->open) { 1537 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1538 return; 1539 } 1540 1541 lData = UART_LCR_WLEN8; 1542 lStop = 0x00; /* 1 stop bit */ 1543 lParity = 0x00; /* No parity */ 1544 1545 cflag = tty->termios.c_cflag; 1546 iflag = tty->termios.c_iflag; 1547 1548 /* Change the number of bits */ 1549 switch (cflag & CSIZE) { 1550 case CS5: 1551 lData = UART_LCR_WLEN5; 1552 mask = 0x1f; 1553 break; 1554 1555 case CS6: 1556 lData = UART_LCR_WLEN6; 1557 mask = 0x3f; 1558 break; 1559 1560 case CS7: 1561 lData = UART_LCR_WLEN7; 1562 mask = 0x7f; 1563 break; 1564 default: 1565 case CS8: 1566 lData = UART_LCR_WLEN8; 1567 break; 1568 } 1569 1570 /* Change the Parity bit */ 1571 if (cflag & PARENB) { 1572 if (cflag & PARODD) { 1573 lParity = UART_LCR_PARITY; 1574 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1575 } else { 1576 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1577 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1578 } 1579 1580 } else { 1581 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1582 } 1583 1584 if (cflag & CMSPAR) 1585 lParity = lParity | 0x20; 1586 1587 /* Change the Stop bit */ 1588 if (cflag & CSTOPB) { 1589 lStop = UART_LCR_STOP; 1590 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1591 } else { 1592 lStop = 0x00; 1593 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1594 } 1595 1596 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1597 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1598 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1599 1600 /* Update the LCR with the correct value */ 1601 mos7720_port->shadowLCR &= 1602 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1603 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1604 1605 1606 /* Disable Interrupts */ 1607 write_mos_reg(serial, port_number, IER, 0x00); 1608 write_mos_reg(serial, port_number, FCR, 0x00); 1609 write_mos_reg(serial, port_number, FCR, 0xcf); 1610 1611 /* Send the updated LCR value to the mos7720 */ 1612 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1613 mos7720_port->shadowMCR = 0x0b; 1614 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1615 1616 /* set up the MCR register and send it to the mos7720 */ 1617 mos7720_port->shadowMCR = UART_MCR_OUT2; 1618 if (cflag & CBAUD) 1619 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1620 1621 if (cflag & CRTSCTS) { 1622 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1623 /* To set hardware flow control to the specified * 1624 * serial port, in SP1/2_CONTROL_REG */ 1625 if (port_number) 1626 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1627 else 1628 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1629 1630 } else 1631 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1632 1633 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1634 1635 /* Determine divisor based on baud rate */ 1636 baud = tty_get_baud_rate(tty); 1637 if (!baud) { 1638 /* pick a default, any default... */ 1639 dev_dbg(&port->dev, "Picked default baud...\n"); 1640 baud = 9600; 1641 } 1642 1643 if (baud >= 230400) { 1644 set_higher_rates(mos7720_port, baud); 1645 /* Enable Interrupts */ 1646 write_mos_reg(serial, port_number, IER, 0x0c); 1647 return; 1648 } 1649 1650 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1651 status = send_cmd_write_baud_rate(mos7720_port, baud); 1652 /* FIXME: needs to write actual resulting baud back not just 1653 blindly do so */ 1654 if (cflag & CBAUD) 1655 tty_encode_baud_rate(tty, baud, baud); 1656 /* Enable Interrupts */ 1657 write_mos_reg(serial, port_number, IER, 0x0c); 1658 1659 if (port->read_urb->status != -EINPROGRESS) { 1660 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1661 if (status) 1662 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1663 } 1664 } 1665 1666 /* 1667 * mos7720_set_termios 1668 * this function is called by the tty driver when it wants to change the 1669 * termios structure. 1670 */ 1671 static void mos7720_set_termios(struct tty_struct *tty, 1672 struct usb_serial_port *port, struct ktermios *old_termios) 1673 { 1674 int status; 1675 unsigned int cflag; 1676 struct usb_serial *serial; 1677 struct moschip_port *mos7720_port; 1678 1679 serial = port->serial; 1680 1681 mos7720_port = usb_get_serial_port_data(port); 1682 1683 if (mos7720_port == NULL) 1684 return; 1685 1686 if (!mos7720_port->open) { 1687 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1688 return; 1689 } 1690 1691 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1692 1693 cflag = tty->termios.c_cflag; 1694 1695 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1696 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1697 1698 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1699 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1700 1701 /* change the port settings to the new ones specified */ 1702 change_port_settings(tty, mos7720_port, old_termios); 1703 1704 if (port->read_urb->status != -EINPROGRESS) { 1705 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1706 if (status) 1707 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1708 } 1709 } 1710 1711 /* 1712 * get_lsr_info - get line status register info 1713 * 1714 * Purpose: Let user call ioctl() to get info when the UART physically 1715 * is emptied. On bus types like RS485, the transmitter must 1716 * release the bus after transmitting. This must be done when 1717 * the transmit shift register is empty, not be done when the 1718 * transmit holding register is empty. This functionality 1719 * allows an RS485 driver to be written in user space. 1720 */ 1721 static int get_lsr_info(struct tty_struct *tty, 1722 struct moschip_port *mos7720_port, unsigned int __user *value) 1723 { 1724 struct usb_serial_port *port = tty->driver_data; 1725 unsigned int result = 0; 1726 unsigned char data = 0; 1727 int port_number = port->port_number; 1728 int count; 1729 1730 count = mos7720_chars_in_buffer(tty); 1731 if (count == 0) { 1732 read_mos_reg(port->serial, port_number, LSR, &data); 1733 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1734 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1735 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1736 result = TIOCSER_TEMT; 1737 } 1738 } 1739 if (copy_to_user(value, &result, sizeof(int))) 1740 return -EFAULT; 1741 return 0; 1742 } 1743 1744 static int mos7720_tiocmget(struct tty_struct *tty) 1745 { 1746 struct usb_serial_port *port = tty->driver_data; 1747 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1748 unsigned int result = 0; 1749 unsigned int mcr ; 1750 unsigned int msr ; 1751 1752 mcr = mos7720_port->shadowMCR; 1753 msr = mos7720_port->shadowMSR; 1754 1755 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1756 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1757 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1758 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1759 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1760 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1761 1762 return result; 1763 } 1764 1765 static int mos7720_tiocmset(struct tty_struct *tty, 1766 unsigned int set, unsigned int clear) 1767 { 1768 struct usb_serial_port *port = tty->driver_data; 1769 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1770 unsigned int mcr ; 1771 1772 mcr = mos7720_port->shadowMCR; 1773 1774 if (set & TIOCM_RTS) 1775 mcr |= UART_MCR_RTS; 1776 if (set & TIOCM_DTR) 1777 mcr |= UART_MCR_DTR; 1778 if (set & TIOCM_LOOP) 1779 mcr |= UART_MCR_LOOP; 1780 1781 if (clear & TIOCM_RTS) 1782 mcr &= ~UART_MCR_RTS; 1783 if (clear & TIOCM_DTR) 1784 mcr &= ~UART_MCR_DTR; 1785 if (clear & TIOCM_LOOP) 1786 mcr &= ~UART_MCR_LOOP; 1787 1788 mos7720_port->shadowMCR = mcr; 1789 write_mos_reg(port->serial, port->port_number, MCR, 1790 mos7720_port->shadowMCR); 1791 1792 return 0; 1793 } 1794 1795 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1796 unsigned int __user *value) 1797 { 1798 unsigned int mcr; 1799 unsigned int arg; 1800 1801 struct usb_serial_port *port; 1802 1803 if (mos7720_port == NULL) 1804 return -1; 1805 1806 port = (struct usb_serial_port *)mos7720_port->port; 1807 mcr = mos7720_port->shadowMCR; 1808 1809 if (copy_from_user(&arg, value, sizeof(int))) 1810 return -EFAULT; 1811 1812 switch (cmd) { 1813 case TIOCMBIS: 1814 if (arg & TIOCM_RTS) 1815 mcr |= UART_MCR_RTS; 1816 if (arg & TIOCM_DTR) 1817 mcr |= UART_MCR_RTS; 1818 if (arg & TIOCM_LOOP) 1819 mcr |= UART_MCR_LOOP; 1820 break; 1821 1822 case TIOCMBIC: 1823 if (arg & TIOCM_RTS) 1824 mcr &= ~UART_MCR_RTS; 1825 if (arg & TIOCM_DTR) 1826 mcr &= ~UART_MCR_RTS; 1827 if (arg & TIOCM_LOOP) 1828 mcr &= ~UART_MCR_LOOP; 1829 break; 1830 1831 } 1832 1833 mos7720_port->shadowMCR = mcr; 1834 write_mos_reg(port->serial, port->port_number, MCR, 1835 mos7720_port->shadowMCR); 1836 1837 return 0; 1838 } 1839 1840 static int get_serial_info(struct moschip_port *mos7720_port, 1841 struct serial_struct __user *retinfo) 1842 { 1843 struct serial_struct tmp; 1844 1845 if (!retinfo) 1846 return -EFAULT; 1847 1848 memset(&tmp, 0, sizeof(tmp)); 1849 1850 tmp.type = PORT_16550A; 1851 tmp.line = mos7720_port->port->minor; 1852 tmp.port = mos7720_port->port->port_number; 1853 tmp.irq = 0; 1854 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1855 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1856 tmp.baud_base = 9600; 1857 tmp.close_delay = 5*HZ; 1858 tmp.closing_wait = 30*HZ; 1859 1860 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1861 return -EFAULT; 1862 return 0; 1863 } 1864 1865 static int mos7720_ioctl(struct tty_struct *tty, 1866 unsigned int cmd, unsigned long arg) 1867 { 1868 struct usb_serial_port *port = tty->driver_data; 1869 struct moschip_port *mos7720_port; 1870 1871 mos7720_port = usb_get_serial_port_data(port); 1872 if (mos7720_port == NULL) 1873 return -ENODEV; 1874 1875 switch (cmd) { 1876 case TIOCSERGETLSR: 1877 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1878 return get_lsr_info(tty, mos7720_port, 1879 (unsigned int __user *)arg); 1880 1881 /* FIXME: These should be using the mode methods */ 1882 case TIOCMBIS: 1883 case TIOCMBIC: 1884 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1885 return set_modem_info(mos7720_port, cmd, 1886 (unsigned int __user *)arg); 1887 1888 case TIOCGSERIAL: 1889 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1890 return get_serial_info(mos7720_port, 1891 (struct serial_struct __user *)arg); 1892 } 1893 1894 return -ENOIOCTLCMD; 1895 } 1896 1897 static int mos7720_startup(struct usb_serial *serial) 1898 { 1899 struct usb_device *dev; 1900 char data; 1901 u16 product; 1902 int ret_val; 1903 1904 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1905 dev = serial->dev; 1906 1907 /* 1908 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1909 * port, and the second for the serial port. Because the usbserial core 1910 * assumes both pairs are serial ports, we must engage in a bit of 1911 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1912 * port 0 point to the serial port. However, both moschip devices use a 1913 * single interrupt-in endpoint for both ports (as mentioned a little 1914 * further down), and this endpoint was assigned to port 0. So after 1915 * the swap, we must copy the interrupt endpoint elements from port 1 1916 * (as newly assigned) to port 0, and null out port 1 pointers. 1917 */ 1918 if (product == MOSCHIP_DEVICE_ID_7715) { 1919 struct usb_serial_port *tmp = serial->port[0]; 1920 serial->port[0] = serial->port[1]; 1921 serial->port[1] = tmp; 1922 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1923 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1924 serial->port[0]->interrupt_in_endpointAddress = 1925 tmp->interrupt_in_endpointAddress; 1926 serial->port[1]->interrupt_in_urb = NULL; 1927 serial->port[1]->interrupt_in_buffer = NULL; 1928 } 1929 1930 /* setting configuration feature to one */ 1931 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1932 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1933 1934 /* start the interrupt urb */ 1935 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1936 if (ret_val) 1937 dev_err(&dev->dev, 1938 "%s - Error %d submitting control urb\n", 1939 __func__, ret_val); 1940 1941 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1942 if (product == MOSCHIP_DEVICE_ID_7715) { 1943 ret_val = mos7715_parport_init(serial); 1944 if (ret_val < 0) 1945 return ret_val; 1946 } 1947 #endif 1948 /* LSR For Port 1 */ 1949 read_mos_reg(serial, 0, LSR, &data); 1950 dev_dbg(&dev->dev, "LSR:%x\n", data); 1951 1952 return 0; 1953 } 1954 1955 static void mos7720_release(struct usb_serial *serial) 1956 { 1957 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1958 /* close the parallel port */ 1959 1960 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1961 == MOSCHIP_DEVICE_ID_7715) { 1962 struct urbtracker *urbtrack; 1963 unsigned long flags; 1964 struct mos7715_parport *mos_parport = 1965 usb_get_serial_data(serial); 1966 1967 /* prevent NULL ptr dereference in port callbacks */ 1968 spin_lock(&release_lock); 1969 mos_parport->pp->private_data = NULL; 1970 spin_unlock(&release_lock); 1971 1972 /* wait for synchronous usb calls to return */ 1973 if (mos_parport->msg_pending) 1974 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1975 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1976 1977 parport_remove_port(mos_parport->pp); 1978 usb_set_serial_data(serial, NULL); 1979 mos_parport->serial = NULL; 1980 1981 /* if tasklet currently scheduled, wait for it to complete */ 1982 tasklet_kill(&mos_parport->urb_tasklet); 1983 1984 /* unlink any urbs sent by the tasklet */ 1985 spin_lock_irqsave(&mos_parport->listlock, flags); 1986 list_for_each_entry(urbtrack, 1987 &mos_parport->active_urbs, 1988 urblist_entry) 1989 usb_unlink_urb(urbtrack->urb); 1990 spin_unlock_irqrestore(&mos_parport->listlock, flags); 1991 1992 kref_put(&mos_parport->ref_count, destroy_mos_parport); 1993 } 1994 #endif 1995 } 1996 1997 static int mos7720_port_probe(struct usb_serial_port *port) 1998 { 1999 struct moschip_port *mos7720_port; 2000 2001 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2002 if (!mos7720_port) 2003 return -ENOMEM; 2004 2005 /* Initialize all port interrupt end point to port 0 int endpoint. 2006 * Our device has only one interrupt endpoint common to all ports. 2007 */ 2008 port->interrupt_in_endpointAddress = 2009 port->serial->port[0]->interrupt_in_endpointAddress; 2010 mos7720_port->port = port; 2011 2012 usb_set_serial_port_data(port, mos7720_port); 2013 2014 return 0; 2015 } 2016 2017 static int mos7720_port_remove(struct usb_serial_port *port) 2018 { 2019 struct moschip_port *mos7720_port; 2020 2021 mos7720_port = usb_get_serial_port_data(port); 2022 kfree(mos7720_port); 2023 2024 return 0; 2025 } 2026 2027 static struct usb_serial_driver moschip7720_2port_driver = { 2028 .driver = { 2029 .owner = THIS_MODULE, 2030 .name = "moschip7720", 2031 }, 2032 .description = "Moschip 2 port adapter", 2033 .id_table = id_table, 2034 .calc_num_ports = mos77xx_calc_num_ports, 2035 .open = mos7720_open, 2036 .close = mos7720_close, 2037 .throttle = mos7720_throttle, 2038 .unthrottle = mos7720_unthrottle, 2039 .probe = mos77xx_probe, 2040 .attach = mos7720_startup, 2041 .release = mos7720_release, 2042 .port_probe = mos7720_port_probe, 2043 .port_remove = mos7720_port_remove, 2044 .ioctl = mos7720_ioctl, 2045 .tiocmget = mos7720_tiocmget, 2046 .tiocmset = mos7720_tiocmset, 2047 .set_termios = mos7720_set_termios, 2048 .write = mos7720_write, 2049 .write_room = mos7720_write_room, 2050 .chars_in_buffer = mos7720_chars_in_buffer, 2051 .break_ctl = mos7720_break, 2052 .read_bulk_callback = mos7720_bulk_in_callback, 2053 .read_int_callback = NULL /* dynamically assigned in probe() */ 2054 }; 2055 2056 static struct usb_serial_driver * const serial_drivers[] = { 2057 &moschip7720_2port_driver, NULL 2058 }; 2059 2060 module_usb_serial_driver(serial_drivers, id_table); 2061 2062 MODULE_AUTHOR(DRIVER_AUTHOR); 2063 MODULE_DESCRIPTION(DRIVER_DESC); 2064 MODULE_LICENSE("GPL"); 2065