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 struct tty_struct *tty; 936 int status = urb->status; 937 938 if (status) { 939 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 940 return; 941 } 942 943 mos7720_port = urb->context; 944 if (!mos7720_port) { 945 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 946 return ; 947 } 948 949 tty = tty_port_tty_get(&mos7720_port->port->port); 950 951 if (tty && mos7720_port->open) 952 tty_wakeup(tty); 953 tty_kref_put(tty); 954 } 955 956 /* 957 * mos77xx_probe 958 * this function installs the appropriate read interrupt endpoint callback 959 * depending on whether the device is a 7720 or 7715, thus avoiding costly 960 * run-time checks in the high-frequency callback routine itself. 961 */ 962 static int mos77xx_probe(struct usb_serial *serial, 963 const struct usb_device_id *id) 964 { 965 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 966 moschip7720_2port_driver.read_int_callback = 967 mos7715_interrupt_callback; 968 else 969 moschip7720_2port_driver.read_int_callback = 970 mos7720_interrupt_callback; 971 972 return 0; 973 } 974 975 static int mos77xx_calc_num_ports(struct usb_serial *serial) 976 { 977 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 978 if (product == MOSCHIP_DEVICE_ID_7715) 979 return 1; 980 981 return 2; 982 } 983 984 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 985 { 986 struct usb_serial *serial; 987 struct urb *urb; 988 struct moschip_port *mos7720_port; 989 int response; 990 int port_number; 991 __u8 data; 992 int allocated_urbs = 0; 993 int j; 994 995 serial = port->serial; 996 997 mos7720_port = usb_get_serial_port_data(port); 998 if (mos7720_port == NULL) 999 return -ENODEV; 1000 1001 usb_clear_halt(serial->dev, port->write_urb->pipe); 1002 usb_clear_halt(serial->dev, port->read_urb->pipe); 1003 1004 /* Initialising the write urb pool */ 1005 for (j = 0; j < NUM_URBS; ++j) { 1006 urb = usb_alloc_urb(0, GFP_KERNEL); 1007 mos7720_port->write_urb_pool[j] = urb; 1008 1009 if (urb == NULL) { 1010 dev_err(&port->dev, "No more urbs???\n"); 1011 continue; 1012 } 1013 1014 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1015 GFP_KERNEL); 1016 if (!urb->transfer_buffer) { 1017 dev_err(&port->dev, 1018 "%s-out of memory for urb buffers.\n", 1019 __func__); 1020 usb_free_urb(mos7720_port->write_urb_pool[j]); 1021 mos7720_port->write_urb_pool[j] = NULL; 1022 continue; 1023 } 1024 allocated_urbs++; 1025 } 1026 1027 if (!allocated_urbs) 1028 return -ENOMEM; 1029 1030 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1031 * 1032 * Register Index 1033 * 0 : THR/RHR 1034 * 1 : IER 1035 * 2 : FCR 1036 * 3 : LCR 1037 * 4 : MCR 1038 * 5 : LSR 1039 * 6 : MSR 1040 * 7 : SPR 1041 * 1042 * 0x08 : SP1/2 Control Reg 1043 */ 1044 port_number = port->number - port->serial->minor; 1045 read_mos_reg(serial, port_number, LSR, &data); 1046 1047 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1048 1049 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1050 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1051 1052 write_mos_reg(serial, port_number, IER, 0x00); 1053 write_mos_reg(serial, port_number, FCR, 0x00); 1054 1055 write_mos_reg(serial, port_number, FCR, 0xcf); 1056 mos7720_port->shadowLCR = 0x03; 1057 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1058 mos7720_port->shadowMCR = 0x0b; 1059 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1060 1061 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1062 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1063 data = data | (port->number - port->serial->minor + 1); 1064 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1065 mos7720_port->shadowLCR = 0x83; 1066 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1067 write_mos_reg(serial, port_number, THR, 0x0c); 1068 write_mos_reg(serial, port_number, IER, 0x00); 1069 mos7720_port->shadowLCR = 0x03; 1070 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1071 write_mos_reg(serial, port_number, IER, 0x0c); 1072 1073 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1074 if (response) 1075 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1076 __func__, response); 1077 1078 /* initialize our icount structure */ 1079 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 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 mutex_lock(&serial->disc_mutex); 1148 /* these commands must not be issued if the device has 1149 * been disconnected */ 1150 if (!serial->disconnected) { 1151 write_mos_reg(serial, port->number - port->serial->minor, 1152 MCR, 0x00); 1153 write_mos_reg(serial, port->number - port->serial->minor, 1154 IER, 0x00); 1155 } 1156 mutex_unlock(&serial->disc_mutex); 1157 mos7720_port->open = 0; 1158 } 1159 1160 static void mos7720_break(struct tty_struct *tty, int break_state) 1161 { 1162 struct usb_serial_port *port = tty->driver_data; 1163 unsigned char data; 1164 struct usb_serial *serial; 1165 struct moschip_port *mos7720_port; 1166 1167 serial = port->serial; 1168 1169 mos7720_port = usb_get_serial_port_data(port); 1170 if (mos7720_port == NULL) 1171 return; 1172 1173 if (break_state == -1) 1174 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1175 else 1176 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1177 1178 mos7720_port->shadowLCR = data; 1179 write_mos_reg(serial, port->number - port->serial->minor, 1180 LCR, mos7720_port->shadowLCR); 1181 } 1182 1183 /* 1184 * mos7720_write_room 1185 * this function is called by the tty driver when it wants to know how many 1186 * bytes of data we can accept for a specific port. 1187 * If successful, we return the amount of room that we have for this port 1188 * Otherwise we return a negative error number. 1189 */ 1190 static int mos7720_write_room(struct tty_struct *tty) 1191 { 1192 struct usb_serial_port *port = tty->driver_data; 1193 struct moschip_port *mos7720_port; 1194 int room = 0; 1195 int i; 1196 1197 mos7720_port = usb_get_serial_port_data(port); 1198 if (mos7720_port == NULL) 1199 return -ENODEV; 1200 1201 /* FIXME: Locking */ 1202 for (i = 0; i < NUM_URBS; ++i) { 1203 if (mos7720_port->write_urb_pool[i] && 1204 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1205 room += URB_TRANSFER_BUFFER_SIZE; 1206 } 1207 1208 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1209 return room; 1210 } 1211 1212 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1213 const unsigned char *data, int count) 1214 { 1215 int status; 1216 int i; 1217 int bytes_sent = 0; 1218 int transfer_size; 1219 1220 struct moschip_port *mos7720_port; 1221 struct usb_serial *serial; 1222 struct urb *urb; 1223 const unsigned char *current_position = data; 1224 1225 serial = port->serial; 1226 1227 mos7720_port = usb_get_serial_port_data(port); 1228 if (mos7720_port == NULL) 1229 return -ENODEV; 1230 1231 /* try to find a free urb in the list */ 1232 urb = NULL; 1233 1234 for (i = 0; i < NUM_URBS; ++i) { 1235 if (mos7720_port->write_urb_pool[i] && 1236 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1237 urb = mos7720_port->write_urb_pool[i]; 1238 dev_dbg(&port->dev, "URB:%d\n", i); 1239 break; 1240 } 1241 } 1242 1243 if (urb == NULL) { 1244 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1245 goto exit; 1246 } 1247 1248 if (urb->transfer_buffer == NULL) { 1249 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1250 GFP_KERNEL); 1251 if (urb->transfer_buffer == NULL) { 1252 dev_err_console(port, "%s no more kernel memory...\n", 1253 __func__); 1254 goto exit; 1255 } 1256 } 1257 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1258 1259 memcpy(urb->transfer_buffer, current_position, transfer_size); 1260 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1261 urb->transfer_buffer); 1262 1263 /* fill urb with data and submit */ 1264 usb_fill_bulk_urb(urb, serial->dev, 1265 usb_sndbulkpipe(serial->dev, 1266 port->bulk_out_endpointAddress), 1267 urb->transfer_buffer, transfer_size, 1268 mos7720_bulk_out_data_callback, mos7720_port); 1269 1270 /* send it down the pipe */ 1271 status = usb_submit_urb(urb, GFP_ATOMIC); 1272 if (status) { 1273 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1274 "with status = %d\n", __func__, status); 1275 bytes_sent = status; 1276 goto exit; 1277 } 1278 bytes_sent = transfer_size; 1279 1280 exit: 1281 return bytes_sent; 1282 } 1283 1284 static void mos7720_throttle(struct tty_struct *tty) 1285 { 1286 struct usb_serial_port *port = tty->driver_data; 1287 struct moschip_port *mos7720_port; 1288 int status; 1289 1290 mos7720_port = usb_get_serial_port_data(port); 1291 1292 if (mos7720_port == NULL) 1293 return; 1294 1295 if (!mos7720_port->open) { 1296 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1297 return; 1298 } 1299 1300 /* if we are implementing XON/XOFF, send the stop character */ 1301 if (I_IXOFF(tty)) { 1302 unsigned char stop_char = STOP_CHAR(tty); 1303 status = mos7720_write(tty, port, &stop_char, 1); 1304 if (status <= 0) 1305 return; 1306 } 1307 1308 /* if we are implementing RTS/CTS, toggle that line */ 1309 if (tty->termios.c_cflag & CRTSCTS) { 1310 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1311 write_mos_reg(port->serial, port->number - port->serial->minor, 1312 MCR, mos7720_port->shadowMCR); 1313 if (status != 0) 1314 return; 1315 } 1316 } 1317 1318 static void mos7720_unthrottle(struct tty_struct *tty) 1319 { 1320 struct usb_serial_port *port = tty->driver_data; 1321 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1322 int status; 1323 1324 if (mos7720_port == NULL) 1325 return; 1326 1327 if (!mos7720_port->open) { 1328 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1329 return; 1330 } 1331 1332 /* if we are implementing XON/XOFF, send the start character */ 1333 if (I_IXOFF(tty)) { 1334 unsigned char start_char = START_CHAR(tty); 1335 status = mos7720_write(tty, port, &start_char, 1); 1336 if (status <= 0) 1337 return; 1338 } 1339 1340 /* if we are implementing RTS/CTS, toggle that line */ 1341 if (tty->termios.c_cflag & CRTSCTS) { 1342 mos7720_port->shadowMCR |= UART_MCR_RTS; 1343 write_mos_reg(port->serial, port->number - port->serial->minor, 1344 MCR, mos7720_port->shadowMCR); 1345 if (status != 0) 1346 return; 1347 } 1348 } 1349 1350 /* FIXME: this function does not work */ 1351 static int set_higher_rates(struct moschip_port *mos7720_port, 1352 unsigned int baud) 1353 { 1354 struct usb_serial_port *port; 1355 struct usb_serial *serial; 1356 int port_number; 1357 enum mos_regs sp_reg; 1358 if (mos7720_port == NULL) 1359 return -EINVAL; 1360 1361 port = mos7720_port->port; 1362 serial = port->serial; 1363 1364 /*********************************************** 1365 * Init Sequence for higher rates 1366 ***********************************************/ 1367 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1368 port_number = port->number - port->serial->minor; 1369 1370 write_mos_reg(serial, port_number, IER, 0x00); 1371 write_mos_reg(serial, port_number, FCR, 0x00); 1372 write_mos_reg(serial, port_number, FCR, 0xcf); 1373 mos7720_port->shadowMCR = 0x0b; 1374 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1375 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1376 1377 /*********************************************** 1378 * Set for higher rates * 1379 ***********************************************/ 1380 /* writing baud rate verbatum into uart clock field clearly not right */ 1381 if (port_number == 0) 1382 sp_reg = SP1_REG; 1383 else 1384 sp_reg = SP2_REG; 1385 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1386 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1387 mos7720_port->shadowMCR = 0x2b; 1388 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1389 1390 /*********************************************** 1391 * Set DLL/DLM 1392 ***********************************************/ 1393 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1394 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1395 write_mos_reg(serial, port_number, DLL, 0x01); 1396 write_mos_reg(serial, port_number, DLM, 0x00); 1397 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1398 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1399 1400 return 0; 1401 } 1402 1403 /* baud rate information */ 1404 struct divisor_table_entry { 1405 __u32 baudrate; 1406 __u16 divisor; 1407 }; 1408 1409 /* Define table of divisors for moschip 7720 hardware * 1410 * These assume a 3.6864MHz crystal, the standard /16, and * 1411 * MCR.7 = 0. */ 1412 static struct divisor_table_entry divisor_table[] = { 1413 { 50, 2304}, 1414 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1415 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1416 { 150, 768}, 1417 { 300, 384}, 1418 { 600, 192}, 1419 { 1200, 96}, 1420 { 1800, 64}, 1421 { 2400, 48}, 1422 { 4800, 24}, 1423 { 7200, 16}, 1424 { 9600, 12}, 1425 { 19200, 6}, 1426 { 38400, 3}, 1427 { 57600, 2}, 1428 { 115200, 1}, 1429 }; 1430 1431 /***************************************************************************** 1432 * calc_baud_rate_divisor 1433 * this function calculates the proper baud rate divisor for the specified 1434 * baud rate. 1435 *****************************************************************************/ 1436 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1437 { 1438 int i; 1439 __u16 custom; 1440 __u16 round1; 1441 __u16 round; 1442 1443 1444 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1445 1446 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1447 if (divisor_table[i].baudrate == baudrate) { 1448 *divisor = divisor_table[i].divisor; 1449 return 0; 1450 } 1451 } 1452 1453 /* After trying for all the standard baud rates * 1454 * Try calculating the divisor for this baud rate */ 1455 if (baudrate > 75 && baudrate < 230400) { 1456 /* get the divisor */ 1457 custom = (__u16)(230400L / baudrate); 1458 1459 /* Check for round off */ 1460 round1 = (__u16)(2304000L / baudrate); 1461 round = (__u16)(round1 - (custom * 10)); 1462 if (round > 4) 1463 custom++; 1464 *divisor = custom; 1465 1466 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1467 return 0; 1468 } 1469 1470 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1471 return -EINVAL; 1472 } 1473 1474 /* 1475 * send_cmd_write_baud_rate 1476 * this function sends the proper command to change the baud rate of the 1477 * specified port. 1478 */ 1479 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1480 int baudrate) 1481 { 1482 struct usb_serial_port *port; 1483 struct usb_serial *serial; 1484 int divisor; 1485 int status; 1486 unsigned char number; 1487 1488 if (mos7720_port == NULL) 1489 return -1; 1490 1491 port = mos7720_port->port; 1492 serial = port->serial; 1493 1494 number = port->number - port->serial->minor; 1495 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1496 1497 /* Calculate the Divisor */ 1498 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1499 if (status) { 1500 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1501 return status; 1502 } 1503 1504 /* Enable access to divisor latch */ 1505 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1506 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1507 1508 /* Write the divisor */ 1509 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1510 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1511 1512 /* Disable access to divisor latch */ 1513 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1514 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1515 1516 return status; 1517 } 1518 1519 /* 1520 * change_port_settings 1521 * This routine is called to set the UART on the device to match 1522 * the specified new settings. 1523 */ 1524 static void change_port_settings(struct tty_struct *tty, 1525 struct moschip_port *mos7720_port, 1526 struct ktermios *old_termios) 1527 { 1528 struct usb_serial_port *port; 1529 struct usb_serial *serial; 1530 int baud; 1531 unsigned cflag; 1532 unsigned iflag; 1533 __u8 mask = 0xff; 1534 __u8 lData; 1535 __u8 lParity; 1536 __u8 lStop; 1537 int status; 1538 int port_number; 1539 1540 if (mos7720_port == NULL) 1541 return ; 1542 1543 port = mos7720_port->port; 1544 serial = port->serial; 1545 port_number = port->number - port->serial->minor; 1546 1547 if (!mos7720_port->open) { 1548 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1549 return; 1550 } 1551 1552 lData = UART_LCR_WLEN8; 1553 lStop = 0x00; /* 1 stop bit */ 1554 lParity = 0x00; /* No parity */ 1555 1556 cflag = tty->termios.c_cflag; 1557 iflag = tty->termios.c_iflag; 1558 1559 /* Change the number of bits */ 1560 switch (cflag & CSIZE) { 1561 case CS5: 1562 lData = UART_LCR_WLEN5; 1563 mask = 0x1f; 1564 break; 1565 1566 case CS6: 1567 lData = UART_LCR_WLEN6; 1568 mask = 0x3f; 1569 break; 1570 1571 case CS7: 1572 lData = UART_LCR_WLEN7; 1573 mask = 0x7f; 1574 break; 1575 default: 1576 case CS8: 1577 lData = UART_LCR_WLEN8; 1578 break; 1579 } 1580 1581 /* Change the Parity bit */ 1582 if (cflag & PARENB) { 1583 if (cflag & PARODD) { 1584 lParity = UART_LCR_PARITY; 1585 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1586 } else { 1587 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1588 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1589 } 1590 1591 } else { 1592 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1593 } 1594 1595 if (cflag & CMSPAR) 1596 lParity = lParity | 0x20; 1597 1598 /* Change the Stop bit */ 1599 if (cflag & CSTOPB) { 1600 lStop = UART_LCR_STOP; 1601 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1602 } else { 1603 lStop = 0x00; 1604 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1605 } 1606 1607 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1608 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1609 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1610 1611 /* Update the LCR with the correct value */ 1612 mos7720_port->shadowLCR &= 1613 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1614 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1615 1616 1617 /* Disable Interrupts */ 1618 write_mos_reg(serial, port_number, IER, 0x00); 1619 write_mos_reg(serial, port_number, FCR, 0x00); 1620 write_mos_reg(serial, port_number, FCR, 0xcf); 1621 1622 /* Send the updated LCR value to the mos7720 */ 1623 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1624 mos7720_port->shadowMCR = 0x0b; 1625 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1626 1627 /* set up the MCR register and send it to the mos7720 */ 1628 mos7720_port->shadowMCR = UART_MCR_OUT2; 1629 if (cflag & CBAUD) 1630 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1631 1632 if (cflag & CRTSCTS) { 1633 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1634 /* To set hardware flow control to the specified * 1635 * serial port, in SP1/2_CONTROL_REG */ 1636 if (port->number) 1637 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1638 else 1639 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1640 1641 } else 1642 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1643 1644 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1645 1646 /* Determine divisor based on baud rate */ 1647 baud = tty_get_baud_rate(tty); 1648 if (!baud) { 1649 /* pick a default, any default... */ 1650 dev_dbg(&port->dev, "Picked default baud...\n"); 1651 baud = 9600; 1652 } 1653 1654 if (baud >= 230400) { 1655 set_higher_rates(mos7720_port, baud); 1656 /* Enable Interrupts */ 1657 write_mos_reg(serial, port_number, IER, 0x0c); 1658 return; 1659 } 1660 1661 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1662 status = send_cmd_write_baud_rate(mos7720_port, baud); 1663 /* FIXME: needs to write actual resulting baud back not just 1664 blindly do so */ 1665 if (cflag & CBAUD) 1666 tty_encode_baud_rate(tty, baud, baud); 1667 /* Enable Interrupts */ 1668 write_mos_reg(serial, port_number, IER, 0x0c); 1669 1670 if (port->read_urb->status != -EINPROGRESS) { 1671 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1672 if (status) 1673 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1674 } 1675 } 1676 1677 /* 1678 * mos7720_set_termios 1679 * this function is called by the tty driver when it wants to change the 1680 * termios structure. 1681 */ 1682 static void mos7720_set_termios(struct tty_struct *tty, 1683 struct usb_serial_port *port, struct ktermios *old_termios) 1684 { 1685 int status; 1686 unsigned int cflag; 1687 struct usb_serial *serial; 1688 struct moschip_port *mos7720_port; 1689 1690 serial = port->serial; 1691 1692 mos7720_port = usb_get_serial_port_data(port); 1693 1694 if (mos7720_port == NULL) 1695 return; 1696 1697 if (!mos7720_port->open) { 1698 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1699 return; 1700 } 1701 1702 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1703 1704 cflag = tty->termios.c_cflag; 1705 1706 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1707 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1708 1709 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1710 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1711 1712 /* change the port settings to the new ones specified */ 1713 change_port_settings(tty, mos7720_port, old_termios); 1714 1715 if (port->read_urb->status != -EINPROGRESS) { 1716 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1717 if (status) 1718 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1719 } 1720 } 1721 1722 /* 1723 * get_lsr_info - get line status register info 1724 * 1725 * Purpose: Let user call ioctl() to get info when the UART physically 1726 * is emptied. On bus types like RS485, the transmitter must 1727 * release the bus after transmitting. This must be done when 1728 * the transmit shift register is empty, not be done when the 1729 * transmit holding register is empty. This functionality 1730 * allows an RS485 driver to be written in user space. 1731 */ 1732 static int get_lsr_info(struct tty_struct *tty, 1733 struct moschip_port *mos7720_port, unsigned int __user *value) 1734 { 1735 struct usb_serial_port *port = tty->driver_data; 1736 unsigned int result = 0; 1737 unsigned char data = 0; 1738 int port_number = port->number - port->serial->minor; 1739 int count; 1740 1741 count = mos7720_chars_in_buffer(tty); 1742 if (count == 0) { 1743 read_mos_reg(port->serial, port_number, LSR, &data); 1744 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1745 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1746 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1747 result = TIOCSER_TEMT; 1748 } 1749 } 1750 if (copy_to_user(value, &result, sizeof(int))) 1751 return -EFAULT; 1752 return 0; 1753 } 1754 1755 static int mos7720_tiocmget(struct tty_struct *tty) 1756 { 1757 struct usb_serial_port *port = tty->driver_data; 1758 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1759 unsigned int result = 0; 1760 unsigned int mcr ; 1761 unsigned int msr ; 1762 1763 mcr = mos7720_port->shadowMCR; 1764 msr = mos7720_port->shadowMSR; 1765 1766 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1767 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1768 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1769 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1770 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1771 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1772 1773 return result; 1774 } 1775 1776 static int mos7720_tiocmset(struct tty_struct *tty, 1777 unsigned int set, unsigned int clear) 1778 { 1779 struct usb_serial_port *port = tty->driver_data; 1780 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1781 unsigned int mcr ; 1782 1783 mcr = mos7720_port->shadowMCR; 1784 1785 if (set & TIOCM_RTS) 1786 mcr |= UART_MCR_RTS; 1787 if (set & TIOCM_DTR) 1788 mcr |= UART_MCR_DTR; 1789 if (set & TIOCM_LOOP) 1790 mcr |= UART_MCR_LOOP; 1791 1792 if (clear & TIOCM_RTS) 1793 mcr &= ~UART_MCR_RTS; 1794 if (clear & TIOCM_DTR) 1795 mcr &= ~UART_MCR_DTR; 1796 if (clear & TIOCM_LOOP) 1797 mcr &= ~UART_MCR_LOOP; 1798 1799 mos7720_port->shadowMCR = mcr; 1800 write_mos_reg(port->serial, port->number - port->serial->minor, 1801 MCR, mos7720_port->shadowMCR); 1802 1803 return 0; 1804 } 1805 1806 static int mos7720_get_icount(struct tty_struct *tty, 1807 struct serial_icounter_struct *icount) 1808 { 1809 struct usb_serial_port *port = tty->driver_data; 1810 struct moschip_port *mos7720_port; 1811 struct async_icount cnow; 1812 1813 mos7720_port = usb_get_serial_port_data(port); 1814 cnow = mos7720_port->icount; 1815 1816 icount->cts = cnow.cts; 1817 icount->dsr = cnow.dsr; 1818 icount->rng = cnow.rng; 1819 icount->dcd = cnow.dcd; 1820 icount->rx = cnow.rx; 1821 icount->tx = cnow.tx; 1822 icount->frame = cnow.frame; 1823 icount->overrun = cnow.overrun; 1824 icount->parity = cnow.parity; 1825 icount->brk = cnow.brk; 1826 icount->buf_overrun = cnow.buf_overrun; 1827 1828 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__, 1829 icount->rx, icount->tx); 1830 return 0; 1831 } 1832 1833 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1834 unsigned int __user *value) 1835 { 1836 unsigned int mcr; 1837 unsigned int arg; 1838 1839 struct usb_serial_port *port; 1840 1841 if (mos7720_port == NULL) 1842 return -1; 1843 1844 port = (struct usb_serial_port *)mos7720_port->port; 1845 mcr = mos7720_port->shadowMCR; 1846 1847 if (copy_from_user(&arg, value, sizeof(int))) 1848 return -EFAULT; 1849 1850 switch (cmd) { 1851 case TIOCMBIS: 1852 if (arg & TIOCM_RTS) 1853 mcr |= UART_MCR_RTS; 1854 if (arg & TIOCM_DTR) 1855 mcr |= UART_MCR_RTS; 1856 if (arg & TIOCM_LOOP) 1857 mcr |= UART_MCR_LOOP; 1858 break; 1859 1860 case TIOCMBIC: 1861 if (arg & TIOCM_RTS) 1862 mcr &= ~UART_MCR_RTS; 1863 if (arg & TIOCM_DTR) 1864 mcr &= ~UART_MCR_RTS; 1865 if (arg & TIOCM_LOOP) 1866 mcr &= ~UART_MCR_LOOP; 1867 break; 1868 1869 } 1870 1871 mos7720_port->shadowMCR = mcr; 1872 write_mos_reg(port->serial, port->number - port->serial->minor, 1873 MCR, mos7720_port->shadowMCR); 1874 1875 return 0; 1876 } 1877 1878 static int get_serial_info(struct moschip_port *mos7720_port, 1879 struct serial_struct __user *retinfo) 1880 { 1881 struct serial_struct tmp; 1882 1883 if (!retinfo) 1884 return -EFAULT; 1885 1886 memset(&tmp, 0, sizeof(tmp)); 1887 1888 tmp.type = PORT_16550A; 1889 tmp.line = mos7720_port->port->serial->minor; 1890 tmp.port = mos7720_port->port->number; 1891 tmp.irq = 0; 1892 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1893 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1894 tmp.baud_base = 9600; 1895 tmp.close_delay = 5*HZ; 1896 tmp.closing_wait = 30*HZ; 1897 1898 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1899 return -EFAULT; 1900 return 0; 1901 } 1902 1903 static int mos7720_ioctl(struct tty_struct *tty, 1904 unsigned int cmd, unsigned long arg) 1905 { 1906 struct usb_serial_port *port = tty->driver_data; 1907 struct moschip_port *mos7720_port; 1908 struct async_icount cnow; 1909 struct async_icount cprev; 1910 1911 mos7720_port = usb_get_serial_port_data(port); 1912 if (mos7720_port == NULL) 1913 return -ENODEV; 1914 1915 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1916 1917 switch (cmd) { 1918 case TIOCSERGETLSR: 1919 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1920 return get_lsr_info(tty, mos7720_port, 1921 (unsigned int __user *)arg); 1922 1923 /* FIXME: These should be using the mode methods */ 1924 case TIOCMBIS: 1925 case TIOCMBIC: 1926 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1927 return set_modem_info(mos7720_port, cmd, 1928 (unsigned int __user *)arg); 1929 1930 case TIOCGSERIAL: 1931 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1932 return get_serial_info(mos7720_port, 1933 (struct serial_struct __user *)arg); 1934 1935 case TIOCMIWAIT: 1936 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__); 1937 cprev = mos7720_port->icount; 1938 while (1) { 1939 if (signal_pending(current)) 1940 return -ERESTARTSYS; 1941 cnow = mos7720_port->icount; 1942 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1943 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1944 return -EIO; /* no change => error */ 1945 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1946 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1947 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1948 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1949 return 0; 1950 } 1951 cprev = cnow; 1952 } 1953 /* NOTREACHED */ 1954 break; 1955 } 1956 1957 return -ENOIOCTLCMD; 1958 } 1959 1960 static int mos7720_startup(struct usb_serial *serial) 1961 { 1962 struct usb_device *dev; 1963 char data; 1964 u16 product; 1965 int ret_val; 1966 1967 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1968 dev = serial->dev; 1969 1970 /* 1971 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1972 * port, and the second for the serial port. Because the usbserial core 1973 * assumes both pairs are serial ports, we must engage in a bit of 1974 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1975 * port 0 point to the serial port. However, both moschip devices use a 1976 * single interrupt-in endpoint for both ports (as mentioned a little 1977 * further down), and this endpoint was assigned to port 0. So after 1978 * the swap, we must copy the interrupt endpoint elements from port 1 1979 * (as newly assigned) to port 0, and null out port 1 pointers. 1980 */ 1981 if (product == MOSCHIP_DEVICE_ID_7715) { 1982 struct usb_serial_port *tmp = serial->port[0]; 1983 serial->port[0] = serial->port[1]; 1984 serial->port[1] = tmp; 1985 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1986 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1987 serial->port[0]->interrupt_in_endpointAddress = 1988 tmp->interrupt_in_endpointAddress; 1989 serial->port[1]->interrupt_in_urb = NULL; 1990 serial->port[1]->interrupt_in_buffer = NULL; 1991 } 1992 1993 /* setting configuration feature to one */ 1994 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1995 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 1996 1997 /* start the interrupt urb */ 1998 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1999 if (ret_val) 2000 dev_err(&dev->dev, 2001 "%s - Error %d submitting control urb\n", 2002 __func__, ret_val); 2003 2004 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2005 if (product == MOSCHIP_DEVICE_ID_7715) { 2006 ret_val = mos7715_parport_init(serial); 2007 if (ret_val < 0) 2008 return ret_val; 2009 } 2010 #endif 2011 /* LSR For Port 1 */ 2012 read_mos_reg(serial, 0, LSR, &data); 2013 dev_dbg(&dev->dev, "LSR:%x\n", data); 2014 2015 return 0; 2016 } 2017 2018 static void mos7720_release(struct usb_serial *serial) 2019 { 2020 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2021 /* close the parallel port */ 2022 2023 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2024 == MOSCHIP_DEVICE_ID_7715) { 2025 struct urbtracker *urbtrack; 2026 unsigned long flags; 2027 struct mos7715_parport *mos_parport = 2028 usb_get_serial_data(serial); 2029 2030 /* prevent NULL ptr dereference in port callbacks */ 2031 spin_lock(&release_lock); 2032 mos_parport->pp->private_data = NULL; 2033 spin_unlock(&release_lock); 2034 2035 /* wait for synchronous usb calls to return */ 2036 if (mos_parport->msg_pending) 2037 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2038 MOS_WDR_TIMEOUT); 2039 2040 parport_remove_port(mos_parport->pp); 2041 usb_set_serial_data(serial, NULL); 2042 mos_parport->serial = NULL; 2043 2044 /* if tasklet currently scheduled, wait for it to complete */ 2045 tasklet_kill(&mos_parport->urb_tasklet); 2046 2047 /* unlink any urbs sent by the tasklet */ 2048 spin_lock_irqsave(&mos_parport->listlock, flags); 2049 list_for_each_entry(urbtrack, 2050 &mos_parport->active_urbs, 2051 urblist_entry) 2052 usb_unlink_urb(urbtrack->urb); 2053 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2054 2055 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2056 } 2057 #endif 2058 } 2059 2060 static int mos7720_port_probe(struct usb_serial_port *port) 2061 { 2062 struct moschip_port *mos7720_port; 2063 2064 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2065 if (!mos7720_port) 2066 return -ENOMEM; 2067 2068 /* Initialize all port interrupt end point to port 0 int endpoint. 2069 * Our device has only one interrupt endpoint common to all ports. 2070 */ 2071 port->interrupt_in_endpointAddress = 2072 port->serial->port[0]->interrupt_in_endpointAddress; 2073 mos7720_port->port = port; 2074 2075 usb_set_serial_port_data(port, mos7720_port); 2076 2077 return 0; 2078 } 2079 2080 static int mos7720_port_remove(struct usb_serial_port *port) 2081 { 2082 struct moschip_port *mos7720_port; 2083 2084 mos7720_port = usb_get_serial_port_data(port); 2085 kfree(mos7720_port); 2086 2087 return 0; 2088 } 2089 2090 static struct usb_serial_driver moschip7720_2port_driver = { 2091 .driver = { 2092 .owner = THIS_MODULE, 2093 .name = "moschip7720", 2094 }, 2095 .description = "Moschip 2 port adapter", 2096 .id_table = id_table, 2097 .calc_num_ports = mos77xx_calc_num_ports, 2098 .open = mos7720_open, 2099 .close = mos7720_close, 2100 .throttle = mos7720_throttle, 2101 .unthrottle = mos7720_unthrottle, 2102 .probe = mos77xx_probe, 2103 .attach = mos7720_startup, 2104 .release = mos7720_release, 2105 .port_probe = mos7720_port_probe, 2106 .port_remove = mos7720_port_remove, 2107 .ioctl = mos7720_ioctl, 2108 .tiocmget = mos7720_tiocmget, 2109 .tiocmset = mos7720_tiocmset, 2110 .get_icount = mos7720_get_icount, 2111 .set_termios = mos7720_set_termios, 2112 .write = mos7720_write, 2113 .write_room = mos7720_write_room, 2114 .chars_in_buffer = mos7720_chars_in_buffer, 2115 .break_ctl = mos7720_break, 2116 .read_bulk_callback = mos7720_bulk_in_callback, 2117 .read_int_callback = NULL /* dynamically assigned in probe() */ 2118 }; 2119 2120 static struct usb_serial_driver * const serial_drivers[] = { 2121 &moschip7720_2port_driver, NULL 2122 }; 2123 2124 module_usb_serial_driver(serial_drivers, id_table); 2125 2126 MODULE_AUTHOR(DRIVER_AUTHOR); 2127 MODULE_DESCRIPTION(DRIVER_DESC); 2128 MODULE_LICENSE("GPL"); 2129