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 (HZ * 5) 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 async_icount icount; 66 struct usb_serial_port *port; /* loop back to the owner */ 67 struct urb *write_urb_pool[NUM_URBS]; 68 }; 69 70 static struct usb_serial_driver moschip7720_2port_driver; 71 72 #define USB_VENDOR_ID_MOSCHIP 0x9710 73 #define MOSCHIP_DEVICE_ID_7720 0x7720 74 #define MOSCHIP_DEVICE_ID_7715 0x7715 75 76 static const struct usb_device_id id_table[] = { 77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 78 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 79 { } /* terminating entry */ 80 }; 81 MODULE_DEVICE_TABLE(usb, id_table); 82 83 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 84 85 /* initial values for parport regs */ 86 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 87 #define ECR_INIT_VAL 0x00 /* SPP mode */ 88 89 struct urbtracker { 90 struct mos7715_parport *mos_parport; 91 struct list_head urblist_entry; 92 struct kref ref_count; 93 struct urb *urb; 94 }; 95 96 enum mos7715_pp_modes { 97 SPP = 0<<5, 98 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 99 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 100 }; 101 102 struct mos7715_parport { 103 struct parport *pp; /* back to containing struct */ 104 struct kref ref_count; /* to instance of this struct */ 105 struct list_head deferred_urbs; /* list deferred async urbs */ 106 struct list_head active_urbs; /* list async urbs in flight */ 107 spinlock_t listlock; /* protects list access */ 108 bool msg_pending; /* usb sync call pending */ 109 struct completion syncmsg_compl; /* usb sync call completed */ 110 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 111 struct usb_serial *serial; /* back to containing struct */ 112 __u8 shadowECR; /* parallel port regs... */ 113 __u8 shadowDCR; 114 atomic_t shadowDSR; /* updated in int-in callback */ 115 }; 116 117 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 118 static DEFINE_SPINLOCK(release_lock); 119 120 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 121 122 static const unsigned int dummy; /* for clarity in register access fns */ 123 124 enum mos_regs { 125 THR, /* serial port regs */ 126 RHR, 127 IER, 128 FCR, 129 ISR, 130 LCR, 131 MCR, 132 LSR, 133 MSR, 134 SPR, 135 DLL, 136 DLM, 137 DPR, /* parallel port regs */ 138 DSR, 139 DCR, 140 ECR, 141 SP1_REG, /* device control regs */ 142 SP2_REG, /* serial port 2 (7720 only) */ 143 PP_REG, 144 SP_CONTROL_REG, 145 }; 146 147 /* 148 * Return the correct value for the Windex field of the setup packet 149 * for a control endpoint message. See the 7715 datasheet. 150 */ 151 static inline __u16 get_reg_index(enum mos_regs reg) 152 { 153 static const __u16 mos7715_index_lookup_table[] = { 154 0x00, /* THR */ 155 0x00, /* RHR */ 156 0x01, /* IER */ 157 0x02, /* FCR */ 158 0x02, /* ISR */ 159 0x03, /* LCR */ 160 0x04, /* MCR */ 161 0x05, /* LSR */ 162 0x06, /* MSR */ 163 0x07, /* SPR */ 164 0x00, /* DLL */ 165 0x01, /* DLM */ 166 0x00, /* DPR */ 167 0x01, /* DSR */ 168 0x02, /* DCR */ 169 0x0a, /* ECR */ 170 0x01, /* SP1_REG */ 171 0x02, /* SP2_REG (7720 only) */ 172 0x04, /* PP_REG (7715 only) */ 173 0x08, /* SP_CONTROL_REG */ 174 }; 175 return mos7715_index_lookup_table[reg]; 176 } 177 178 /* 179 * Return the correct value for the upper byte of the Wvalue field of 180 * the setup packet for a control endpoint message. 181 */ 182 static inline __u16 get_reg_value(enum mos_regs reg, 183 unsigned int serial_portnum) 184 { 185 if (reg >= SP1_REG) /* control reg */ 186 return 0x0000; 187 188 else if (reg >= DPR) /* parallel port reg (7715 only) */ 189 return 0x0100; 190 191 else /* serial port reg */ 192 return (serial_portnum + 2) << 8; 193 } 194 195 /* 196 * Write data byte to the specified device register. The data is embedded in 197 * the value field of the setup packet. serial_portnum is ignored for registers 198 * not specific to a particular serial port. 199 */ 200 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 201 enum mos_regs reg, __u8 data) 202 { 203 struct usb_device *usbdev = serial->dev; 204 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 205 __u8 request = (__u8)0x0e; 206 __u8 requesttype = (__u8)0x40; 207 __u16 index = get_reg_index(reg); 208 __u16 value = get_reg_value(reg, serial_portnum) + data; 209 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 210 index, NULL, 0, MOS_WDR_TIMEOUT); 211 if (status < 0) 212 dev_err(&usbdev->dev, 213 "mos7720: usb_control_msg() failed: %d", status); 214 return status; 215 } 216 217 /* 218 * Read data byte from the specified device register. The data returned by the 219 * device is embedded in the value field of the setup packet. serial_portnum is 220 * ignored for registers that are not specific to a particular serial port. 221 */ 222 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 223 enum mos_regs reg, __u8 *data) 224 { 225 struct usb_device *usbdev = serial->dev; 226 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 227 __u8 request = (__u8)0x0d; 228 __u8 requesttype = (__u8)0xc0; 229 __u16 index = get_reg_index(reg); 230 __u16 value = get_reg_value(reg, serial_portnum); 231 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 232 index, data, 1, MOS_WDR_TIMEOUT); 233 if (status < 0) 234 dev_err(&usbdev->dev, 235 "mos7720: usb_control_msg() failed: %d", status); 236 return status; 237 } 238 239 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 240 241 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 242 enum mos7715_pp_modes mode) 243 { 244 mos_parport->shadowECR = mode; 245 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 246 return 0; 247 } 248 249 static void destroy_mos_parport(struct kref *kref) 250 { 251 struct mos7715_parport *mos_parport = 252 container_of(kref, struct mos7715_parport, ref_count); 253 254 kfree(mos_parport); 255 } 256 257 static void destroy_urbtracker(struct kref *kref) 258 { 259 struct urbtracker *urbtrack = 260 container_of(kref, struct urbtracker, ref_count); 261 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 262 263 usb_free_urb(urbtrack->urb); 264 kfree(urbtrack); 265 kref_put(&mos_parport->ref_count, destroy_mos_parport); 266 } 267 268 /* 269 * This runs as a tasklet when sending an urb in a non-blocking parallel 270 * port callback had to be deferred because the disconnect mutex could not be 271 * obtained at the time. 272 */ 273 static void send_deferred_urbs(unsigned long _mos_parport) 274 { 275 int ret_val; 276 unsigned long flags; 277 struct mos7715_parport *mos_parport = (void *)_mos_parport; 278 struct urbtracker *urbtrack, *tmp; 279 struct list_head *cursor, *next; 280 struct device *dev; 281 282 /* if release function ran, game over */ 283 if (unlikely(mos_parport->serial == NULL)) 284 return; 285 286 dev = &mos_parport->serial->dev->dev; 287 288 /* try again to get the mutex */ 289 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 290 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 291 tasklet_schedule(&mos_parport->urb_tasklet); 292 return; 293 } 294 295 /* if device disconnected, game over */ 296 if (unlikely(mos_parport->serial->disconnected)) { 297 mutex_unlock(&mos_parport->serial->disc_mutex); 298 return; 299 } 300 301 spin_lock_irqsave(&mos_parport->listlock, flags); 302 if (list_empty(&mos_parport->deferred_urbs)) { 303 spin_unlock_irqrestore(&mos_parport->listlock, flags); 304 mutex_unlock(&mos_parport->serial->disc_mutex); 305 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 306 return; 307 } 308 309 /* move contents of deferred_urbs list to active_urbs list and submit */ 310 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 311 list_move_tail(cursor, &mos_parport->active_urbs); 312 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 313 urblist_entry) { 314 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 315 dev_dbg(dev, "%s: urb submitted\n", __func__); 316 if (ret_val) { 317 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 318 list_del(&urbtrack->urblist_entry); 319 kref_put(&urbtrack->ref_count, destroy_urbtracker); 320 } 321 } 322 spin_unlock_irqrestore(&mos_parport->listlock, flags); 323 mutex_unlock(&mos_parport->serial->disc_mutex); 324 } 325 326 /* callback for parallel port control urbs submitted asynchronously */ 327 static void async_complete(struct urb *urb) 328 { 329 struct urbtracker *urbtrack = urb->context; 330 int status = urb->status; 331 332 if (unlikely(status)) 333 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 334 335 /* remove the urbtracker from the active_urbs list */ 336 spin_lock(&urbtrack->mos_parport->listlock); 337 list_del(&urbtrack->urblist_entry); 338 spin_unlock(&urbtrack->mos_parport->listlock); 339 kref_put(&urbtrack->ref_count, destroy_urbtracker); 340 } 341 342 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 343 enum mos_regs reg, __u8 data) 344 { 345 struct urbtracker *urbtrack; 346 int ret_val; 347 unsigned long flags; 348 struct usb_ctrlrequest setup; 349 struct usb_serial *serial = mos_parport->serial; 350 struct usb_device *usbdev = serial->dev; 351 352 /* create and initialize the control urb and containing urbtracker */ 353 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 354 if (urbtrack == NULL) { 355 dev_err(&usbdev->dev, "out of memory"); 356 return -ENOMEM; 357 } 358 kref_get(&mos_parport->ref_count); 359 urbtrack->mos_parport = mos_parport; 360 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 361 if (urbtrack->urb == NULL) { 362 dev_err(&usbdev->dev, "out of urbs"); 363 kfree(urbtrack); 364 return -ENOMEM; 365 } 366 setup.bRequestType = (__u8)0x40; 367 setup.bRequest = (__u8)0x0e; 368 setup.wValue = get_reg_value(reg, dummy); 369 setup.wIndex = get_reg_index(reg); 370 setup.wLength = 0; 371 usb_fill_control_urb(urbtrack->urb, usbdev, 372 usb_sndctrlpipe(usbdev, 0), 373 (unsigned char *)&setup, 374 NULL, 0, async_complete, urbtrack); 375 kref_init(&urbtrack->ref_count); 376 INIT_LIST_HEAD(&urbtrack->urblist_entry); 377 378 /* 379 * get the disconnect mutex, or add tracker to the deferred_urbs list 380 * and schedule a tasklet to try again later 381 */ 382 if (!mutex_trylock(&serial->disc_mutex)) { 383 spin_lock_irqsave(&mos_parport->listlock, flags); 384 list_add_tail(&urbtrack->urblist_entry, 385 &mos_parport->deferred_urbs); 386 spin_unlock_irqrestore(&mos_parport->listlock, flags); 387 tasklet_schedule(&mos_parport->urb_tasklet); 388 dev_dbg(&usbdev->dev, "tasklet scheduled"); 389 return 0; 390 } 391 392 /* bail if device disconnected */ 393 if (serial->disconnected) { 394 kref_put(&urbtrack->ref_count, destroy_urbtracker); 395 mutex_unlock(&serial->disc_mutex); 396 return -ENODEV; 397 } 398 399 /* add the tracker to the active_urbs list and submit */ 400 spin_lock_irqsave(&mos_parport->listlock, flags); 401 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 402 spin_unlock_irqrestore(&mos_parport->listlock, flags); 403 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 404 mutex_unlock(&serial->disc_mutex); 405 if (ret_val) { 406 dev_err(&usbdev->dev, 407 "%s: submit_urb() failed: %d", __func__, ret_val); 408 spin_lock_irqsave(&mos_parport->listlock, flags); 409 list_del(&urbtrack->urblist_entry); 410 spin_unlock_irqrestore(&mos_parport->listlock, flags); 411 kref_put(&urbtrack->ref_count, destroy_urbtracker); 412 return ret_val; 413 } 414 return 0; 415 } 416 417 /* 418 * This is the the common top part of all parallel port callback operations that 419 * send synchronous messages to the device. This implements convoluted locking 420 * that avoids two scenarios: (1) a port operation is called after usbserial 421 * has called our release function, at which point struct mos7715_parport has 422 * been destroyed, and (2) the device has been disconnected, but usbserial has 423 * not called the release function yet because someone has a serial port open. 424 * The shared release_lock prevents the first, and the mutex and disconnected 425 * flag maintained by usbserial covers the second. We also use the msg_pending 426 * flag to ensure that all synchronous usb messgage calls have completed before 427 * our release function can return. 428 */ 429 static int parport_prologue(struct parport *pp) 430 { 431 struct mos7715_parport *mos_parport; 432 433 spin_lock(&release_lock); 434 mos_parport = pp->private_data; 435 if (unlikely(mos_parport == NULL)) { 436 /* release fn called, port struct destroyed */ 437 spin_unlock(&release_lock); 438 return -1; 439 } 440 mos_parport->msg_pending = true; /* synch usb call pending */ 441 INIT_COMPLETION(mos_parport->syncmsg_compl); 442 spin_unlock(&release_lock); 443 444 mutex_lock(&mos_parport->serial->disc_mutex); 445 if (mos_parport->serial->disconnected) { 446 /* device disconnected */ 447 mutex_unlock(&mos_parport->serial->disc_mutex); 448 mos_parport->msg_pending = false; 449 complete(&mos_parport->syncmsg_compl); 450 return -1; 451 } 452 453 return 0; 454 } 455 456 /* 457 * This is the the common bottom part of all parallel port functions that send 458 * synchronous messages to the device. 459 */ 460 static inline void parport_epilogue(struct parport *pp) 461 { 462 struct mos7715_parport *mos_parport = pp->private_data; 463 mutex_unlock(&mos_parport->serial->disc_mutex); 464 mos_parport->msg_pending = false; 465 complete(&mos_parport->syncmsg_compl); 466 } 467 468 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 469 { 470 struct mos7715_parport *mos_parport = pp->private_data; 471 472 if (parport_prologue(pp) < 0) 473 return; 474 mos7715_change_mode(mos_parport, SPP); 475 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 476 parport_epilogue(pp); 477 } 478 479 static unsigned char parport_mos7715_read_data(struct parport *pp) 480 { 481 struct mos7715_parport *mos_parport = pp->private_data; 482 unsigned char d; 483 484 if (parport_prologue(pp) < 0) 485 return 0; 486 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 487 parport_epilogue(pp); 488 return d; 489 } 490 491 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 492 { 493 struct mos7715_parport *mos_parport = pp->private_data; 494 __u8 data; 495 496 if (parport_prologue(pp) < 0) 497 return; 498 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 499 write_mos_reg(mos_parport->serial, dummy, DCR, data); 500 mos_parport->shadowDCR = data; 501 parport_epilogue(pp); 502 } 503 504 static unsigned char parport_mos7715_read_control(struct parport *pp) 505 { 506 struct mos7715_parport *mos_parport = pp->private_data; 507 __u8 dcr; 508 509 spin_lock(&release_lock); 510 mos_parport = pp->private_data; 511 if (unlikely(mos_parport == NULL)) { 512 spin_unlock(&release_lock); 513 return 0; 514 } 515 dcr = mos_parport->shadowDCR & 0x0f; 516 spin_unlock(&release_lock); 517 return dcr; 518 } 519 520 static unsigned char parport_mos7715_frob_control(struct parport *pp, 521 unsigned char mask, 522 unsigned char val) 523 { 524 struct mos7715_parport *mos_parport = pp->private_data; 525 __u8 dcr; 526 527 mask &= 0x0f; 528 val &= 0x0f; 529 if (parport_prologue(pp) < 0) 530 return 0; 531 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 532 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 533 dcr = mos_parport->shadowDCR & 0x0f; 534 parport_epilogue(pp); 535 return dcr; 536 } 537 538 static unsigned char parport_mos7715_read_status(struct parport *pp) 539 { 540 unsigned char status; 541 struct mos7715_parport *mos_parport = pp->private_data; 542 543 spin_lock(&release_lock); 544 mos_parport = pp->private_data; 545 if (unlikely(mos_parport == NULL)) { /* release called */ 546 spin_unlock(&release_lock); 547 return 0; 548 } 549 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 550 spin_unlock(&release_lock); 551 return status; 552 } 553 554 static void parport_mos7715_enable_irq(struct parport *pp) 555 { 556 } 557 558 static void parport_mos7715_disable_irq(struct parport *pp) 559 { 560 } 561 562 static void parport_mos7715_data_forward(struct parport *pp) 563 { 564 struct mos7715_parport *mos_parport = pp->private_data; 565 566 if (parport_prologue(pp) < 0) 567 return; 568 mos7715_change_mode(mos_parport, PS2); 569 mos_parport->shadowDCR &= ~0x20; 570 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 571 parport_epilogue(pp); 572 } 573 574 static void parport_mos7715_data_reverse(struct parport *pp) 575 { 576 struct mos7715_parport *mos_parport = pp->private_data; 577 578 if (parport_prologue(pp) < 0) 579 return; 580 mos7715_change_mode(mos_parport, PS2); 581 mos_parport->shadowDCR |= 0x20; 582 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 583 parport_epilogue(pp); 584 } 585 586 static void parport_mos7715_init_state(struct pardevice *dev, 587 struct parport_state *s) 588 { 589 s->u.pc.ctr = DCR_INIT_VAL; 590 s->u.pc.ecr = ECR_INIT_VAL; 591 } 592 593 /* N.B. Parport core code requires that this function not block */ 594 static void parport_mos7715_save_state(struct parport *pp, 595 struct parport_state *s) 596 { 597 struct mos7715_parport *mos_parport; 598 599 spin_lock(&release_lock); 600 mos_parport = pp->private_data; 601 if (unlikely(mos_parport == NULL)) { /* release called */ 602 spin_unlock(&release_lock); 603 return; 604 } 605 s->u.pc.ctr = mos_parport->shadowDCR; 606 s->u.pc.ecr = mos_parport->shadowECR; 607 spin_unlock(&release_lock); 608 } 609 610 /* N.B. Parport core code requires that this function not block */ 611 static void parport_mos7715_restore_state(struct parport *pp, 612 struct parport_state *s) 613 { 614 struct mos7715_parport *mos_parport; 615 616 spin_lock(&release_lock); 617 mos_parport = pp->private_data; 618 if (unlikely(mos_parport == NULL)) { /* release called */ 619 spin_unlock(&release_lock); 620 return; 621 } 622 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 623 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 624 spin_unlock(&release_lock); 625 } 626 627 static size_t parport_mos7715_write_compat(struct parport *pp, 628 const void *buffer, 629 size_t len, int flags) 630 { 631 int retval; 632 struct mos7715_parport *mos_parport = pp->private_data; 633 int actual_len; 634 635 if (parport_prologue(pp) < 0) 636 return 0; 637 mos7715_change_mode(mos_parport, PPF); 638 retval = usb_bulk_msg(mos_parport->serial->dev, 639 usb_sndbulkpipe(mos_parport->serial->dev, 2), 640 (void *)buffer, len, &actual_len, 641 MOS_WDR_TIMEOUT); 642 parport_epilogue(pp); 643 if (retval) { 644 dev_err(&mos_parport->serial->dev->dev, 645 "mos7720: usb_bulk_msg() failed: %d", retval); 646 return 0; 647 } 648 return actual_len; 649 } 650 651 static struct parport_operations parport_mos7715_ops = { 652 .owner = THIS_MODULE, 653 .write_data = parport_mos7715_write_data, 654 .read_data = parport_mos7715_read_data, 655 656 .write_control = parport_mos7715_write_control, 657 .read_control = parport_mos7715_read_control, 658 .frob_control = parport_mos7715_frob_control, 659 660 .read_status = parport_mos7715_read_status, 661 662 .enable_irq = parport_mos7715_enable_irq, 663 .disable_irq = parport_mos7715_disable_irq, 664 665 .data_forward = parport_mos7715_data_forward, 666 .data_reverse = parport_mos7715_data_reverse, 667 668 .init_state = parport_mos7715_init_state, 669 .save_state = parport_mos7715_save_state, 670 .restore_state = parport_mos7715_restore_state, 671 672 .compat_write_data = parport_mos7715_write_compat, 673 674 .nibble_read_data = parport_ieee1284_read_nibble, 675 .byte_read_data = parport_ieee1284_read_byte, 676 }; 677 678 /* 679 * Allocate and initialize parallel port control struct, initialize 680 * the parallel port hardware device, and register with the parport subsystem. 681 */ 682 static int mos7715_parport_init(struct usb_serial *serial) 683 { 684 struct mos7715_parport *mos_parport; 685 686 /* allocate and initialize parallel port control struct */ 687 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 688 if (mos_parport == NULL) { 689 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__); 690 return -ENOMEM; 691 } 692 mos_parport->msg_pending = false; 693 kref_init(&mos_parport->ref_count); 694 spin_lock_init(&mos_parport->listlock); 695 INIT_LIST_HEAD(&mos_parport->active_urbs); 696 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 697 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 698 mos_parport->serial = serial; 699 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 700 (unsigned long) mos_parport); 701 init_completion(&mos_parport->syncmsg_compl); 702 703 /* cycle parallel port reset bit */ 704 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 705 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 706 707 /* initialize device registers */ 708 mos_parport->shadowDCR = DCR_INIT_VAL; 709 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 710 mos_parport->shadowECR = ECR_INIT_VAL; 711 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 712 713 /* register with parport core */ 714 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 715 PARPORT_DMA_NONE, 716 &parport_mos7715_ops); 717 if (mos_parport->pp == NULL) { 718 dev_err(&serial->interface->dev, 719 "Could not register parport\n"); 720 kref_put(&mos_parport->ref_count, destroy_mos_parport); 721 return -EIO; 722 } 723 mos_parport->pp->private_data = mos_parport; 724 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 725 mos_parport->pp->dev = &serial->interface->dev; 726 parport_announce_port(mos_parport->pp); 727 728 return 0; 729 } 730 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 731 732 /* 733 * mos7720_interrupt_callback 734 * this is the callback function for when we have received data on the 735 * interrupt endpoint. 736 */ 737 static void mos7720_interrupt_callback(struct urb *urb) 738 { 739 int result; 740 int length; 741 int status = urb->status; 742 struct device *dev = &urb->dev->dev; 743 __u8 *data; 744 __u8 sp1; 745 __u8 sp2; 746 747 switch (status) { 748 case 0: 749 /* success */ 750 break; 751 case -ECONNRESET: 752 case -ENOENT: 753 case -ESHUTDOWN: 754 /* this urb is terminated, clean up */ 755 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 756 return; 757 default: 758 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 759 goto exit; 760 } 761 762 length = urb->actual_length; 763 data = urb->transfer_buffer; 764 765 /* Moschip get 4 bytes 766 * Byte 1 IIR Port 1 (port.number is 0) 767 * Byte 2 IIR Port 2 (port.number is 1) 768 * Byte 3 -------------- 769 * Byte 4 FIFO status for both */ 770 771 /* the above description is inverted 772 * oneukum 2007-03-14 */ 773 774 if (unlikely(length != 4)) { 775 dev_dbg(dev, "Wrong data !!!\n"); 776 return; 777 } 778 779 sp1 = data[3]; 780 sp2 = data[2]; 781 782 if ((sp1 | sp2) & 0x01) { 783 /* No Interrupt Pending in both the ports */ 784 dev_dbg(dev, "No Interrupt !!!\n"); 785 } else { 786 switch (sp1 & 0x0f) { 787 case SERIAL_IIR_RLS: 788 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 789 break; 790 case SERIAL_IIR_CTI: 791 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 792 break; 793 case SERIAL_IIR_MS: 794 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 795 break; 796 } 797 798 switch (sp2 & 0x0f) { 799 case SERIAL_IIR_RLS: 800 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 801 break; 802 case SERIAL_IIR_CTI: 803 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 804 break; 805 case SERIAL_IIR_MS: 806 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 807 break; 808 } 809 } 810 811 exit: 812 result = usb_submit_urb(urb, GFP_ATOMIC); 813 if (result) 814 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 815 } 816 817 /* 818 * mos7715_interrupt_callback 819 * this is the 7715's callback function for when we have received data on 820 * the interrupt endpoint. 821 */ 822 static void mos7715_interrupt_callback(struct urb *urb) 823 { 824 int result; 825 int length; 826 int status = urb->status; 827 struct device *dev = &urb->dev->dev; 828 __u8 *data; 829 __u8 iir; 830 831 switch (status) { 832 case 0: 833 /* success */ 834 break; 835 case -ECONNRESET: 836 case -ENOENT: 837 case -ESHUTDOWN: 838 case -ENODEV: 839 /* this urb is terminated, clean up */ 840 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 841 return; 842 default: 843 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 844 goto exit; 845 } 846 847 length = urb->actual_length; 848 data = urb->transfer_buffer; 849 850 /* Structure of data from 7715 device: 851 * Byte 1: IIR serial Port 852 * Byte 2: unused 853 * Byte 2: DSR parallel port 854 * Byte 4: FIFO status for both */ 855 856 if (unlikely(length != 4)) { 857 dev_dbg(dev, "Wrong data !!!\n"); 858 return; 859 } 860 861 iir = data[0]; 862 if (!(iir & 0x01)) { /* serial port interrupt pending */ 863 switch (iir & 0x0f) { 864 case SERIAL_IIR_RLS: 865 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n"); 866 break; 867 case SERIAL_IIR_CTI: 868 dev_dbg(dev, "Serial Port: Receiver time out\n"); 869 break; 870 case SERIAL_IIR_MS: 871 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 872 break; 873 } 874 } 875 876 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 877 { /* update local copy of DSR reg */ 878 struct usb_serial_port *port = urb->context; 879 struct mos7715_parport *mos_parport = port->serial->private; 880 if (unlikely(mos_parport == NULL)) 881 return; 882 atomic_set(&mos_parport->shadowDSR, data[2]); 883 } 884 #endif 885 886 exit: 887 result = usb_submit_urb(urb, GFP_ATOMIC); 888 if (result) 889 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 890 } 891 892 /* 893 * mos7720_bulk_in_callback 894 * this is the callback function for when we have received data on the 895 * bulk in endpoint. 896 */ 897 static void mos7720_bulk_in_callback(struct urb *urb) 898 { 899 int retval; 900 unsigned char *data ; 901 struct usb_serial_port *port; 902 int status = urb->status; 903 904 if (status) { 905 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 906 return; 907 } 908 909 port = urb->context; 910 911 dev_dbg(&port->dev, "Entering...%s\n", __func__); 912 913 data = urb->transfer_buffer; 914 915 if (urb->actual_length) { 916 tty_insert_flip_string(&port->port, data, urb->actual_length); 917 tty_flip_buffer_push(&port->port); 918 } 919 920 if (port->read_urb->status != -EINPROGRESS) { 921 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 922 if (retval) 923 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 924 } 925 } 926 927 /* 928 * mos7720_bulk_out_data_callback 929 * this is the callback function for when we have finished sending serial 930 * data on the bulk out endpoint. 931 */ 932 static void mos7720_bulk_out_data_callback(struct urb *urb) 933 { 934 struct moschip_port *mos7720_port; 935 int status = urb->status; 936 937 if (status) { 938 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 939 return; 940 } 941 942 mos7720_port = urb->context; 943 if (!mos7720_port) { 944 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 945 return ; 946 } 947 948 if (mos7720_port->open) 949 tty_port_tty_wakeup(&mos7720_port->port->port); 950 } 951 952 /* 953 * mos77xx_probe 954 * this function installs the appropriate read interrupt endpoint callback 955 * depending on whether the device is a 7720 or 7715, thus avoiding costly 956 * run-time checks in the high-frequency callback routine itself. 957 */ 958 static int mos77xx_probe(struct usb_serial *serial, 959 const struct usb_device_id *id) 960 { 961 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 962 moschip7720_2port_driver.read_int_callback = 963 mos7715_interrupt_callback; 964 else 965 moschip7720_2port_driver.read_int_callback = 966 mos7720_interrupt_callback; 967 968 return 0; 969 } 970 971 static int mos77xx_calc_num_ports(struct usb_serial *serial) 972 { 973 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 974 if (product == MOSCHIP_DEVICE_ID_7715) 975 return 1; 976 977 return 2; 978 } 979 980 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 981 { 982 struct usb_serial *serial; 983 struct urb *urb; 984 struct moschip_port *mos7720_port; 985 int response; 986 int port_number; 987 __u8 data; 988 int allocated_urbs = 0; 989 int j; 990 991 serial = port->serial; 992 993 mos7720_port = usb_get_serial_port_data(port); 994 if (mos7720_port == NULL) 995 return -ENODEV; 996 997 usb_clear_halt(serial->dev, port->write_urb->pipe); 998 usb_clear_halt(serial->dev, port->read_urb->pipe); 999 1000 /* Initialising the write urb pool */ 1001 for (j = 0; j < NUM_URBS; ++j) { 1002 urb = usb_alloc_urb(0, GFP_KERNEL); 1003 mos7720_port->write_urb_pool[j] = urb; 1004 1005 if (urb == NULL) { 1006 dev_err(&port->dev, "No more urbs???\n"); 1007 continue; 1008 } 1009 1010 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1011 GFP_KERNEL); 1012 if (!urb->transfer_buffer) { 1013 dev_err(&port->dev, 1014 "%s-out of memory for urb buffers.\n", 1015 __func__); 1016 usb_free_urb(mos7720_port->write_urb_pool[j]); 1017 mos7720_port->write_urb_pool[j] = NULL; 1018 continue; 1019 } 1020 allocated_urbs++; 1021 } 1022 1023 if (!allocated_urbs) 1024 return -ENOMEM; 1025 1026 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1027 * 1028 * Register Index 1029 * 0 : THR/RHR 1030 * 1 : IER 1031 * 2 : FCR 1032 * 3 : LCR 1033 * 4 : MCR 1034 * 5 : LSR 1035 * 6 : MSR 1036 * 7 : SPR 1037 * 1038 * 0x08 : SP1/2 Control Reg 1039 */ 1040 port_number = port->number - port->serial->minor; 1041 read_mos_reg(serial, port_number, LSR, &data); 1042 1043 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1044 1045 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1046 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1047 1048 write_mos_reg(serial, port_number, IER, 0x00); 1049 write_mos_reg(serial, port_number, FCR, 0x00); 1050 1051 write_mos_reg(serial, port_number, FCR, 0xcf); 1052 mos7720_port->shadowLCR = 0x03; 1053 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1054 mos7720_port->shadowMCR = 0x0b; 1055 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1056 1057 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1058 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1059 data = data | (port->number - port->serial->minor + 1); 1060 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1061 mos7720_port->shadowLCR = 0x83; 1062 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1063 write_mos_reg(serial, port_number, THR, 0x0c); 1064 write_mos_reg(serial, port_number, IER, 0x00); 1065 mos7720_port->shadowLCR = 0x03; 1066 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1067 write_mos_reg(serial, port_number, IER, 0x0c); 1068 1069 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1070 if (response) 1071 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1072 __func__, response); 1073 1074 /* initialize our icount structure */ 1075 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1076 1077 /* initialize our port settings */ 1078 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1079 1080 /* send a open port command */ 1081 mos7720_port->open = 1; 1082 1083 return 0; 1084 } 1085 1086 /* 1087 * mos7720_chars_in_buffer 1088 * this function is called by the tty driver when it wants to know how many 1089 * bytes of data we currently have outstanding in the port (data that has 1090 * been written, but hasn't made it out the port yet) 1091 * If successful, we return the number of bytes left to be written in the 1092 * system, 1093 * Otherwise we return a negative error number. 1094 */ 1095 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1096 { 1097 struct usb_serial_port *port = tty->driver_data; 1098 int i; 1099 int chars = 0; 1100 struct moschip_port *mos7720_port; 1101 1102 mos7720_port = usb_get_serial_port_data(port); 1103 if (mos7720_port == NULL) 1104 return 0; 1105 1106 for (i = 0; i < NUM_URBS; ++i) { 1107 if (mos7720_port->write_urb_pool[i] && 1108 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1109 chars += URB_TRANSFER_BUFFER_SIZE; 1110 } 1111 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1112 return chars; 1113 } 1114 1115 static void mos7720_close(struct usb_serial_port *port) 1116 { 1117 struct usb_serial *serial; 1118 struct moschip_port *mos7720_port; 1119 int j; 1120 1121 serial = port->serial; 1122 1123 mos7720_port = usb_get_serial_port_data(port); 1124 if (mos7720_port == NULL) 1125 return; 1126 1127 for (j = 0; j < NUM_URBS; ++j) 1128 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1129 1130 /* Freeing Write URBs */ 1131 for (j = 0; j < NUM_URBS; ++j) { 1132 if (mos7720_port->write_urb_pool[j]) { 1133 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1134 usb_free_urb(mos7720_port->write_urb_pool[j]); 1135 } 1136 } 1137 1138 /* While closing port, shutdown all bulk read, write * 1139 * and interrupt read if they exists, otherwise nop */ 1140 usb_kill_urb(port->write_urb); 1141 usb_kill_urb(port->read_urb); 1142 1143 mutex_lock(&serial->disc_mutex); 1144 /* these commands must not be issued if the device has 1145 * been disconnected */ 1146 if (!serial->disconnected) { 1147 write_mos_reg(serial, port->number - port->serial->minor, 1148 MCR, 0x00); 1149 write_mos_reg(serial, port->number - port->serial->minor, 1150 IER, 0x00); 1151 } 1152 mutex_unlock(&serial->disc_mutex); 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->number - port->serial->minor, 1176 LCR, mos7720_port->shadowLCR); 1177 } 1178 1179 /* 1180 * mos7720_write_room 1181 * this function is called by the tty driver when it wants to know how many 1182 * bytes of data we can accept for a specific port. 1183 * If successful, we return the amount of room that we have for this port 1184 * Otherwise we return a negative error number. 1185 */ 1186 static int mos7720_write_room(struct tty_struct *tty) 1187 { 1188 struct usb_serial_port *port = tty->driver_data; 1189 struct moschip_port *mos7720_port; 1190 int room = 0; 1191 int i; 1192 1193 mos7720_port = usb_get_serial_port_data(port); 1194 if (mos7720_port == NULL) 1195 return -ENODEV; 1196 1197 /* FIXME: Locking */ 1198 for (i = 0; i < NUM_URBS; ++i) { 1199 if (mos7720_port->write_urb_pool[i] && 1200 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1201 room += URB_TRANSFER_BUFFER_SIZE; 1202 } 1203 1204 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1205 return room; 1206 } 1207 1208 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1209 const unsigned char *data, int count) 1210 { 1211 int status; 1212 int i; 1213 int bytes_sent = 0; 1214 int transfer_size; 1215 1216 struct moschip_port *mos7720_port; 1217 struct usb_serial *serial; 1218 struct urb *urb; 1219 const unsigned char *current_position = data; 1220 1221 serial = port->serial; 1222 1223 mos7720_port = usb_get_serial_port_data(port); 1224 if (mos7720_port == NULL) 1225 return -ENODEV; 1226 1227 /* try to find a free urb in the list */ 1228 urb = NULL; 1229 1230 for (i = 0; i < NUM_URBS; ++i) { 1231 if (mos7720_port->write_urb_pool[i] && 1232 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1233 urb = mos7720_port->write_urb_pool[i]; 1234 dev_dbg(&port->dev, "URB:%d\n", i); 1235 break; 1236 } 1237 } 1238 1239 if (urb == NULL) { 1240 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1241 goto exit; 1242 } 1243 1244 if (urb->transfer_buffer == NULL) { 1245 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1246 GFP_KERNEL); 1247 if (urb->transfer_buffer == NULL) { 1248 dev_err_console(port, "%s no more kernel memory...\n", 1249 __func__); 1250 goto exit; 1251 } 1252 } 1253 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1254 1255 memcpy(urb->transfer_buffer, current_position, transfer_size); 1256 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1257 urb->transfer_buffer); 1258 1259 /* fill urb with data and submit */ 1260 usb_fill_bulk_urb(urb, serial->dev, 1261 usb_sndbulkpipe(serial->dev, 1262 port->bulk_out_endpointAddress), 1263 urb->transfer_buffer, transfer_size, 1264 mos7720_bulk_out_data_callback, mos7720_port); 1265 1266 /* send it down the pipe */ 1267 status = usb_submit_urb(urb, GFP_ATOMIC); 1268 if (status) { 1269 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1270 "with status = %d\n", __func__, status); 1271 bytes_sent = status; 1272 goto exit; 1273 } 1274 bytes_sent = transfer_size; 1275 1276 exit: 1277 return bytes_sent; 1278 } 1279 1280 static void mos7720_throttle(struct tty_struct *tty) 1281 { 1282 struct usb_serial_port *port = tty->driver_data; 1283 struct moschip_port *mos7720_port; 1284 int status; 1285 1286 mos7720_port = usb_get_serial_port_data(port); 1287 1288 if (mos7720_port == NULL) 1289 return; 1290 1291 if (!mos7720_port->open) { 1292 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1293 return; 1294 } 1295 1296 /* if we are implementing XON/XOFF, send the stop character */ 1297 if (I_IXOFF(tty)) { 1298 unsigned char stop_char = STOP_CHAR(tty); 1299 status = mos7720_write(tty, port, &stop_char, 1); 1300 if (status <= 0) 1301 return; 1302 } 1303 1304 /* if we are implementing RTS/CTS, toggle that line */ 1305 if (tty->termios.c_cflag & CRTSCTS) { 1306 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1307 write_mos_reg(port->serial, port->number - port->serial->minor, 1308 MCR, mos7720_port->shadowMCR); 1309 if (status != 0) 1310 return; 1311 } 1312 } 1313 1314 static void mos7720_unthrottle(struct tty_struct *tty) 1315 { 1316 struct usb_serial_port *port = tty->driver_data; 1317 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1318 int status; 1319 1320 if (mos7720_port == NULL) 1321 return; 1322 1323 if (!mos7720_port->open) { 1324 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1325 return; 1326 } 1327 1328 /* if we are implementing XON/XOFF, send the start character */ 1329 if (I_IXOFF(tty)) { 1330 unsigned char start_char = START_CHAR(tty); 1331 status = mos7720_write(tty, port, &start_char, 1); 1332 if (status <= 0) 1333 return; 1334 } 1335 1336 /* if we are implementing RTS/CTS, toggle that line */ 1337 if (tty->termios.c_cflag & CRTSCTS) { 1338 mos7720_port->shadowMCR |= UART_MCR_RTS; 1339 write_mos_reg(port->serial, port->number - port->serial->minor, 1340 MCR, mos7720_port->shadowMCR); 1341 if (status != 0) 1342 return; 1343 } 1344 } 1345 1346 /* FIXME: this function does not work */ 1347 static int set_higher_rates(struct moschip_port *mos7720_port, 1348 unsigned int baud) 1349 { 1350 struct usb_serial_port *port; 1351 struct usb_serial *serial; 1352 int port_number; 1353 enum mos_regs sp_reg; 1354 if (mos7720_port == NULL) 1355 return -EINVAL; 1356 1357 port = mos7720_port->port; 1358 serial = port->serial; 1359 1360 /*********************************************** 1361 * Init Sequence for higher rates 1362 ***********************************************/ 1363 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1364 port_number = port->number - port->serial->minor; 1365 1366 write_mos_reg(serial, port_number, IER, 0x00); 1367 write_mos_reg(serial, port_number, FCR, 0x00); 1368 write_mos_reg(serial, port_number, FCR, 0xcf); 1369 mos7720_port->shadowMCR = 0x0b; 1370 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1371 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1372 1373 /*********************************************** 1374 * Set for higher rates * 1375 ***********************************************/ 1376 /* writing baud rate verbatum into uart clock field clearly not right */ 1377 if (port_number == 0) 1378 sp_reg = SP1_REG; 1379 else 1380 sp_reg = SP2_REG; 1381 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1382 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1383 mos7720_port->shadowMCR = 0x2b; 1384 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1385 1386 /*********************************************** 1387 * Set DLL/DLM 1388 ***********************************************/ 1389 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1390 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1391 write_mos_reg(serial, port_number, DLL, 0x01); 1392 write_mos_reg(serial, port_number, DLM, 0x00); 1393 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1394 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1395 1396 return 0; 1397 } 1398 1399 /* baud rate information */ 1400 struct divisor_table_entry { 1401 __u32 baudrate; 1402 __u16 divisor; 1403 }; 1404 1405 /* Define table of divisors for moschip 7720 hardware * 1406 * These assume a 3.6864MHz crystal, the standard /16, and * 1407 * MCR.7 = 0. */ 1408 static struct divisor_table_entry divisor_table[] = { 1409 { 50, 2304}, 1410 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1411 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1412 { 150, 768}, 1413 { 300, 384}, 1414 { 600, 192}, 1415 { 1200, 96}, 1416 { 1800, 64}, 1417 { 2400, 48}, 1418 { 4800, 24}, 1419 { 7200, 16}, 1420 { 9600, 12}, 1421 { 19200, 6}, 1422 { 38400, 3}, 1423 { 57600, 2}, 1424 { 115200, 1}, 1425 }; 1426 1427 /***************************************************************************** 1428 * calc_baud_rate_divisor 1429 * this function calculates the proper baud rate divisor for the specified 1430 * baud rate. 1431 *****************************************************************************/ 1432 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1433 { 1434 int i; 1435 __u16 custom; 1436 __u16 round1; 1437 __u16 round; 1438 1439 1440 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1441 1442 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1443 if (divisor_table[i].baudrate == baudrate) { 1444 *divisor = divisor_table[i].divisor; 1445 return 0; 1446 } 1447 } 1448 1449 /* After trying for all the standard baud rates * 1450 * Try calculating the divisor for this baud rate */ 1451 if (baudrate > 75 && baudrate < 230400) { 1452 /* get the divisor */ 1453 custom = (__u16)(230400L / baudrate); 1454 1455 /* Check for round off */ 1456 round1 = (__u16)(2304000L / baudrate); 1457 round = (__u16)(round1 - (custom * 10)); 1458 if (round > 4) 1459 custom++; 1460 *divisor = custom; 1461 1462 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1463 return 0; 1464 } 1465 1466 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1467 return -EINVAL; 1468 } 1469 1470 /* 1471 * send_cmd_write_baud_rate 1472 * this function sends the proper command to change the baud rate of the 1473 * specified port. 1474 */ 1475 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1476 int baudrate) 1477 { 1478 struct usb_serial_port *port; 1479 struct usb_serial *serial; 1480 int divisor; 1481 int status; 1482 unsigned char number; 1483 1484 if (mos7720_port == NULL) 1485 return -1; 1486 1487 port = mos7720_port->port; 1488 serial = port->serial; 1489 1490 number = port->number - port->serial->minor; 1491 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1492 1493 /* Calculate the Divisor */ 1494 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1495 if (status) { 1496 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1497 return status; 1498 } 1499 1500 /* Enable access to divisor latch */ 1501 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1502 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1503 1504 /* Write the divisor */ 1505 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1506 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1507 1508 /* Disable access to divisor latch */ 1509 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1510 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1511 1512 return status; 1513 } 1514 1515 /* 1516 * change_port_settings 1517 * This routine is called to set the UART on the device to match 1518 * the specified new settings. 1519 */ 1520 static void change_port_settings(struct tty_struct *tty, 1521 struct moschip_port *mos7720_port, 1522 struct ktermios *old_termios) 1523 { 1524 struct usb_serial_port *port; 1525 struct usb_serial *serial; 1526 int baud; 1527 unsigned cflag; 1528 unsigned iflag; 1529 __u8 mask = 0xff; 1530 __u8 lData; 1531 __u8 lParity; 1532 __u8 lStop; 1533 int status; 1534 int port_number; 1535 1536 if (mos7720_port == NULL) 1537 return ; 1538 1539 port = mos7720_port->port; 1540 serial = port->serial; 1541 port_number = port->number - port->serial->minor; 1542 1543 if (!mos7720_port->open) { 1544 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1545 return; 1546 } 1547 1548 lData = UART_LCR_WLEN8; 1549 lStop = 0x00; /* 1 stop bit */ 1550 lParity = 0x00; /* No parity */ 1551 1552 cflag = tty->termios.c_cflag; 1553 iflag = tty->termios.c_iflag; 1554 1555 /* Change the number of bits */ 1556 switch (cflag & CSIZE) { 1557 case CS5: 1558 lData = UART_LCR_WLEN5; 1559 mask = 0x1f; 1560 break; 1561 1562 case CS6: 1563 lData = UART_LCR_WLEN6; 1564 mask = 0x3f; 1565 break; 1566 1567 case CS7: 1568 lData = UART_LCR_WLEN7; 1569 mask = 0x7f; 1570 break; 1571 default: 1572 case CS8: 1573 lData = UART_LCR_WLEN8; 1574 break; 1575 } 1576 1577 /* Change the Parity bit */ 1578 if (cflag & PARENB) { 1579 if (cflag & PARODD) { 1580 lParity = UART_LCR_PARITY; 1581 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1582 } else { 1583 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1584 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1585 } 1586 1587 } else { 1588 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1589 } 1590 1591 if (cflag & CMSPAR) 1592 lParity = lParity | 0x20; 1593 1594 /* Change the Stop bit */ 1595 if (cflag & CSTOPB) { 1596 lStop = UART_LCR_STOP; 1597 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1598 } else { 1599 lStop = 0x00; 1600 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1601 } 1602 1603 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1604 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1605 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1606 1607 /* Update the LCR with the correct value */ 1608 mos7720_port->shadowLCR &= 1609 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1610 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1611 1612 1613 /* Disable Interrupts */ 1614 write_mos_reg(serial, port_number, IER, 0x00); 1615 write_mos_reg(serial, port_number, FCR, 0x00); 1616 write_mos_reg(serial, port_number, FCR, 0xcf); 1617 1618 /* Send the updated LCR value to the mos7720 */ 1619 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1620 mos7720_port->shadowMCR = 0x0b; 1621 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1622 1623 /* set up the MCR register and send it to the mos7720 */ 1624 mos7720_port->shadowMCR = UART_MCR_OUT2; 1625 if (cflag & CBAUD) 1626 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1627 1628 if (cflag & CRTSCTS) { 1629 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1630 /* To set hardware flow control to the specified * 1631 * serial port, in SP1/2_CONTROL_REG */ 1632 if (port->number) 1633 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1634 else 1635 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1636 1637 } else 1638 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1639 1640 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1641 1642 /* Determine divisor based on baud rate */ 1643 baud = tty_get_baud_rate(tty); 1644 if (!baud) { 1645 /* pick a default, any default... */ 1646 dev_dbg(&port->dev, "Picked default baud...\n"); 1647 baud = 9600; 1648 } 1649 1650 if (baud >= 230400) { 1651 set_higher_rates(mos7720_port, baud); 1652 /* Enable Interrupts */ 1653 write_mos_reg(serial, port_number, IER, 0x0c); 1654 return; 1655 } 1656 1657 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1658 status = send_cmd_write_baud_rate(mos7720_port, baud); 1659 /* FIXME: needs to write actual resulting baud back not just 1660 blindly do so */ 1661 if (cflag & CBAUD) 1662 tty_encode_baud_rate(tty, baud, baud); 1663 /* Enable Interrupts */ 1664 write_mos_reg(serial, port_number, IER, 0x0c); 1665 1666 if (port->read_urb->status != -EINPROGRESS) { 1667 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1668 if (status) 1669 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1670 } 1671 } 1672 1673 /* 1674 * mos7720_set_termios 1675 * this function is called by the tty driver when it wants to change the 1676 * termios structure. 1677 */ 1678 static void mos7720_set_termios(struct tty_struct *tty, 1679 struct usb_serial_port *port, struct ktermios *old_termios) 1680 { 1681 int status; 1682 unsigned int cflag; 1683 struct usb_serial *serial; 1684 struct moschip_port *mos7720_port; 1685 1686 serial = port->serial; 1687 1688 mos7720_port = usb_get_serial_port_data(port); 1689 1690 if (mos7720_port == NULL) 1691 return; 1692 1693 if (!mos7720_port->open) { 1694 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1695 return; 1696 } 1697 1698 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1699 1700 cflag = tty->termios.c_cflag; 1701 1702 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1703 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1704 1705 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1706 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1707 1708 /* change the port settings to the new ones specified */ 1709 change_port_settings(tty, mos7720_port, old_termios); 1710 1711 if (port->read_urb->status != -EINPROGRESS) { 1712 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1713 if (status) 1714 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1715 } 1716 } 1717 1718 /* 1719 * get_lsr_info - get line status register info 1720 * 1721 * Purpose: Let user call ioctl() to get info when the UART physically 1722 * is emptied. On bus types like RS485, the transmitter must 1723 * release the bus after transmitting. This must be done when 1724 * the transmit shift register is empty, not be done when the 1725 * transmit holding register is empty. This functionality 1726 * allows an RS485 driver to be written in user space. 1727 */ 1728 static int get_lsr_info(struct tty_struct *tty, 1729 struct moschip_port *mos7720_port, unsigned int __user *value) 1730 { 1731 struct usb_serial_port *port = tty->driver_data; 1732 unsigned int result = 0; 1733 unsigned char data = 0; 1734 int port_number = port->number - port->serial->minor; 1735 int count; 1736 1737 count = mos7720_chars_in_buffer(tty); 1738 if (count == 0) { 1739 read_mos_reg(port->serial, port_number, LSR, &data); 1740 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1741 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1742 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1743 result = TIOCSER_TEMT; 1744 } 1745 } 1746 if (copy_to_user(value, &result, sizeof(int))) 1747 return -EFAULT; 1748 return 0; 1749 } 1750 1751 static int mos7720_tiocmget(struct tty_struct *tty) 1752 { 1753 struct usb_serial_port *port = tty->driver_data; 1754 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1755 unsigned int result = 0; 1756 unsigned int mcr ; 1757 unsigned int msr ; 1758 1759 mcr = mos7720_port->shadowMCR; 1760 msr = mos7720_port->shadowMSR; 1761 1762 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1763 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1764 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1765 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1766 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1767 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1768 1769 return result; 1770 } 1771 1772 static int mos7720_tiocmset(struct tty_struct *tty, 1773 unsigned int set, unsigned int clear) 1774 { 1775 struct usb_serial_port *port = tty->driver_data; 1776 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1777 unsigned int mcr ; 1778 1779 mcr = mos7720_port->shadowMCR; 1780 1781 if (set & TIOCM_RTS) 1782 mcr |= UART_MCR_RTS; 1783 if (set & TIOCM_DTR) 1784 mcr |= UART_MCR_DTR; 1785 if (set & TIOCM_LOOP) 1786 mcr |= UART_MCR_LOOP; 1787 1788 if (clear & TIOCM_RTS) 1789 mcr &= ~UART_MCR_RTS; 1790 if (clear & TIOCM_DTR) 1791 mcr &= ~UART_MCR_DTR; 1792 if (clear & TIOCM_LOOP) 1793 mcr &= ~UART_MCR_LOOP; 1794 1795 mos7720_port->shadowMCR = mcr; 1796 write_mos_reg(port->serial, port->number - port->serial->minor, 1797 MCR, mos7720_port->shadowMCR); 1798 1799 return 0; 1800 } 1801 1802 static int mos7720_get_icount(struct tty_struct *tty, 1803 struct serial_icounter_struct *icount) 1804 { 1805 struct usb_serial_port *port = tty->driver_data; 1806 struct moschip_port *mos7720_port; 1807 struct async_icount cnow; 1808 1809 mos7720_port = usb_get_serial_port_data(port); 1810 cnow = mos7720_port->icount; 1811 1812 icount->cts = cnow.cts; 1813 icount->dsr = cnow.dsr; 1814 icount->rng = cnow.rng; 1815 icount->dcd = cnow.dcd; 1816 icount->rx = cnow.rx; 1817 icount->tx = cnow.tx; 1818 icount->frame = cnow.frame; 1819 icount->overrun = cnow.overrun; 1820 icount->parity = cnow.parity; 1821 icount->brk = cnow.brk; 1822 icount->buf_overrun = cnow.buf_overrun; 1823 1824 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__, 1825 icount->rx, icount->tx); 1826 return 0; 1827 } 1828 1829 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1830 unsigned int __user *value) 1831 { 1832 unsigned int mcr; 1833 unsigned int arg; 1834 1835 struct usb_serial_port *port; 1836 1837 if (mos7720_port == NULL) 1838 return -1; 1839 1840 port = (struct usb_serial_port *)mos7720_port->port; 1841 mcr = mos7720_port->shadowMCR; 1842 1843 if (copy_from_user(&arg, value, sizeof(int))) 1844 return -EFAULT; 1845 1846 switch (cmd) { 1847 case TIOCMBIS: 1848 if (arg & TIOCM_RTS) 1849 mcr |= UART_MCR_RTS; 1850 if (arg & TIOCM_DTR) 1851 mcr |= UART_MCR_RTS; 1852 if (arg & TIOCM_LOOP) 1853 mcr |= UART_MCR_LOOP; 1854 break; 1855 1856 case TIOCMBIC: 1857 if (arg & TIOCM_RTS) 1858 mcr &= ~UART_MCR_RTS; 1859 if (arg & TIOCM_DTR) 1860 mcr &= ~UART_MCR_RTS; 1861 if (arg & TIOCM_LOOP) 1862 mcr &= ~UART_MCR_LOOP; 1863 break; 1864 1865 } 1866 1867 mos7720_port->shadowMCR = mcr; 1868 write_mos_reg(port->serial, port->number - port->serial->minor, 1869 MCR, mos7720_port->shadowMCR); 1870 1871 return 0; 1872 } 1873 1874 static int get_serial_info(struct moschip_port *mos7720_port, 1875 struct serial_struct __user *retinfo) 1876 { 1877 struct serial_struct tmp; 1878 1879 if (!retinfo) 1880 return -EFAULT; 1881 1882 memset(&tmp, 0, sizeof(tmp)); 1883 1884 tmp.type = PORT_16550A; 1885 tmp.line = mos7720_port->port->serial->minor; 1886 tmp.port = mos7720_port->port->number; 1887 tmp.irq = 0; 1888 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1889 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1890 tmp.baud_base = 9600; 1891 tmp.close_delay = 5*HZ; 1892 tmp.closing_wait = 30*HZ; 1893 1894 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1895 return -EFAULT; 1896 return 0; 1897 } 1898 1899 static int mos7720_ioctl(struct tty_struct *tty, 1900 unsigned int cmd, unsigned long arg) 1901 { 1902 struct usb_serial_port *port = tty->driver_data; 1903 struct moschip_port *mos7720_port; 1904 struct async_icount cnow; 1905 struct async_icount cprev; 1906 1907 mos7720_port = usb_get_serial_port_data(port); 1908 if (mos7720_port == NULL) 1909 return -ENODEV; 1910 1911 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1912 1913 switch (cmd) { 1914 case TIOCSERGETLSR: 1915 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1916 return get_lsr_info(tty, mos7720_port, 1917 (unsigned int __user *)arg); 1918 1919 /* FIXME: These should be using the mode methods */ 1920 case TIOCMBIS: 1921 case TIOCMBIC: 1922 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1923 return set_modem_info(mos7720_port, cmd, 1924 (unsigned int __user *)arg); 1925 1926 case TIOCGSERIAL: 1927 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1928 return get_serial_info(mos7720_port, 1929 (struct serial_struct __user *)arg); 1930 1931 case TIOCMIWAIT: 1932 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__); 1933 cprev = mos7720_port->icount; 1934 while (1) { 1935 if (signal_pending(current)) 1936 return -ERESTARTSYS; 1937 cnow = mos7720_port->icount; 1938 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1939 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1940 return -EIO; /* no change => error */ 1941 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1942 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1943 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1944 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1945 return 0; 1946 } 1947 cprev = cnow; 1948 } 1949 /* NOTREACHED */ 1950 break; 1951 } 1952 1953 return -ENOIOCTLCMD; 1954 } 1955 1956 static int mos7720_startup(struct usb_serial *serial) 1957 { 1958 struct usb_device *dev; 1959 char data; 1960 u16 product; 1961 int ret_val; 1962 1963 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1964 dev = serial->dev; 1965 1966 /* 1967 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1968 * port, and the second for the serial port. Because the usbserial core 1969 * assumes both pairs are serial ports, we must engage in a bit of 1970 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1971 * port 0 point to the serial port. However, both moschip devices use a 1972 * single interrupt-in endpoint for both ports (as mentioned a little 1973 * further down), and this endpoint was assigned to port 0. So after 1974 * the swap, we must copy the interrupt endpoint elements from port 1 1975 * (as newly assigned) to port 0, and null out port 1 pointers. 1976 */ 1977 if (product == MOSCHIP_DEVICE_ID_7715) { 1978 struct usb_serial_port *tmp = serial->port[0]; 1979 serial->port[0] = serial->port[1]; 1980 serial->port[1] = tmp; 1981 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1982 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1983 serial->port[0]->interrupt_in_endpointAddress = 1984 tmp->interrupt_in_endpointAddress; 1985 serial->port[1]->interrupt_in_urb = NULL; 1986 serial->port[1]->interrupt_in_buffer = NULL; 1987 } 1988 1989 /* setting configuration feature to one */ 1990 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1991 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 1992 1993 /* start the interrupt urb */ 1994 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1995 if (ret_val) 1996 dev_err(&dev->dev, 1997 "%s - Error %d submitting control urb\n", 1998 __func__, ret_val); 1999 2000 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2001 if (product == MOSCHIP_DEVICE_ID_7715) { 2002 ret_val = mos7715_parport_init(serial); 2003 if (ret_val < 0) 2004 return ret_val; 2005 } 2006 #endif 2007 /* LSR For Port 1 */ 2008 read_mos_reg(serial, 0, LSR, &data); 2009 dev_dbg(&dev->dev, "LSR:%x\n", data); 2010 2011 return 0; 2012 } 2013 2014 static void mos7720_release(struct usb_serial *serial) 2015 { 2016 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2017 /* close the parallel port */ 2018 2019 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2020 == MOSCHIP_DEVICE_ID_7715) { 2021 struct urbtracker *urbtrack; 2022 unsigned long flags; 2023 struct mos7715_parport *mos_parport = 2024 usb_get_serial_data(serial); 2025 2026 /* prevent NULL ptr dereference in port callbacks */ 2027 spin_lock(&release_lock); 2028 mos_parport->pp->private_data = NULL; 2029 spin_unlock(&release_lock); 2030 2031 /* wait for synchronous usb calls to return */ 2032 if (mos_parport->msg_pending) 2033 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2034 MOS_WDR_TIMEOUT); 2035 2036 parport_remove_port(mos_parport->pp); 2037 usb_set_serial_data(serial, NULL); 2038 mos_parport->serial = NULL; 2039 2040 /* if tasklet currently scheduled, wait for it to complete */ 2041 tasklet_kill(&mos_parport->urb_tasklet); 2042 2043 /* unlink any urbs sent by the tasklet */ 2044 spin_lock_irqsave(&mos_parport->listlock, flags); 2045 list_for_each_entry(urbtrack, 2046 &mos_parport->active_urbs, 2047 urblist_entry) 2048 usb_unlink_urb(urbtrack->urb); 2049 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2050 2051 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2052 } 2053 #endif 2054 } 2055 2056 static int mos7720_port_probe(struct usb_serial_port *port) 2057 { 2058 struct moschip_port *mos7720_port; 2059 2060 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2061 if (!mos7720_port) 2062 return -ENOMEM; 2063 2064 /* Initialize all port interrupt end point to port 0 int endpoint. 2065 * Our device has only one interrupt endpoint common to all ports. 2066 */ 2067 port->interrupt_in_endpointAddress = 2068 port->serial->port[0]->interrupt_in_endpointAddress; 2069 mos7720_port->port = port; 2070 2071 usb_set_serial_port_data(port, mos7720_port); 2072 2073 return 0; 2074 } 2075 2076 static int mos7720_port_remove(struct usb_serial_port *port) 2077 { 2078 struct moschip_port *mos7720_port; 2079 2080 mos7720_port = usb_get_serial_port_data(port); 2081 kfree(mos7720_port); 2082 2083 return 0; 2084 } 2085 2086 static struct usb_serial_driver moschip7720_2port_driver = { 2087 .driver = { 2088 .owner = THIS_MODULE, 2089 .name = "moschip7720", 2090 }, 2091 .description = "Moschip 2 port adapter", 2092 .id_table = id_table, 2093 .calc_num_ports = mos77xx_calc_num_ports, 2094 .open = mos7720_open, 2095 .close = mos7720_close, 2096 .throttle = mos7720_throttle, 2097 .unthrottle = mos7720_unthrottle, 2098 .probe = mos77xx_probe, 2099 .attach = mos7720_startup, 2100 .release = mos7720_release, 2101 .port_probe = mos7720_port_probe, 2102 .port_remove = mos7720_port_remove, 2103 .ioctl = mos7720_ioctl, 2104 .tiocmget = mos7720_tiocmget, 2105 .tiocmset = mos7720_tiocmset, 2106 .get_icount = mos7720_get_icount, 2107 .set_termios = mos7720_set_termios, 2108 .write = mos7720_write, 2109 .write_room = mos7720_write_room, 2110 .chars_in_buffer = mos7720_chars_in_buffer, 2111 .break_ctl = mos7720_break, 2112 .read_bulk_callback = mos7720_bulk_in_callback, 2113 .read_int_callback = NULL /* dynamically assigned in probe() */ 2114 }; 2115 2116 static struct usb_serial_driver * const serial_drivers[] = { 2117 &moschip7720_2port_driver, NULL 2118 }; 2119 2120 module_usb_serial_driver(serial_drivers, id_table); 2121 2122 MODULE_AUTHOR(DRIVER_AUTHOR); 2123 MODULE_DESCRIPTION(DRIVER_DESC); 2124 MODULE_LICENSE("GPL"); 2125