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 struct tty_struct *tty; 903 int status = urb->status; 904 905 if (status) { 906 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 907 return; 908 } 909 910 port = urb->context; 911 912 dev_dbg(&port->dev, "Entering...%s\n", __func__); 913 914 data = urb->transfer_buffer; 915 916 tty = tty_port_tty_get(&port->port); 917 if (tty && urb->actual_length) { 918 tty_insert_flip_string(tty, data, urb->actual_length); 919 tty_flip_buffer_push(tty); 920 } 921 tty_kref_put(tty); 922 923 if (port->read_urb->status != -EINPROGRESS) { 924 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 925 if (retval) 926 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 927 } 928 } 929 930 /* 931 * mos7720_bulk_out_data_callback 932 * this is the callback function for when we have finished sending serial 933 * data on the bulk out endpoint. 934 */ 935 static void mos7720_bulk_out_data_callback(struct urb *urb) 936 { 937 struct moschip_port *mos7720_port; 938 struct tty_struct *tty; 939 int status = urb->status; 940 941 if (status) { 942 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 943 return; 944 } 945 946 mos7720_port = urb->context; 947 if (!mos7720_port) { 948 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 949 return ; 950 } 951 952 tty = tty_port_tty_get(&mos7720_port->port->port); 953 954 if (tty && mos7720_port->open) 955 tty_wakeup(tty); 956 tty_kref_put(tty); 957 } 958 959 /* 960 * mos77xx_probe 961 * this function installs the appropriate read interrupt endpoint callback 962 * depending on whether the device is a 7720 or 7715, thus avoiding costly 963 * run-time checks in the high-frequency callback routine itself. 964 */ 965 static int mos77xx_probe(struct usb_serial *serial, 966 const struct usb_device_id *id) 967 { 968 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 969 moschip7720_2port_driver.read_int_callback = 970 mos7715_interrupt_callback; 971 else 972 moschip7720_2port_driver.read_int_callback = 973 mos7720_interrupt_callback; 974 975 return 0; 976 } 977 978 static int mos77xx_calc_num_ports(struct usb_serial *serial) 979 { 980 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 981 if (product == MOSCHIP_DEVICE_ID_7715) 982 return 1; 983 984 return 2; 985 } 986 987 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 988 { 989 struct usb_serial *serial; 990 struct urb *urb; 991 struct moschip_port *mos7720_port; 992 int response; 993 int port_number; 994 __u8 data; 995 int allocated_urbs = 0; 996 int j; 997 998 serial = port->serial; 999 1000 mos7720_port = usb_get_serial_port_data(port); 1001 if (mos7720_port == NULL) 1002 return -ENODEV; 1003 1004 usb_clear_halt(serial->dev, port->write_urb->pipe); 1005 usb_clear_halt(serial->dev, port->read_urb->pipe); 1006 1007 /* Initialising the write urb pool */ 1008 for (j = 0; j < NUM_URBS; ++j) { 1009 urb = usb_alloc_urb(0, GFP_KERNEL); 1010 mos7720_port->write_urb_pool[j] = urb; 1011 1012 if (urb == NULL) { 1013 dev_err(&port->dev, "No more urbs???\n"); 1014 continue; 1015 } 1016 1017 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1018 GFP_KERNEL); 1019 if (!urb->transfer_buffer) { 1020 dev_err(&port->dev, 1021 "%s-out of memory for urb buffers.\n", 1022 __func__); 1023 usb_free_urb(mos7720_port->write_urb_pool[j]); 1024 mos7720_port->write_urb_pool[j] = NULL; 1025 continue; 1026 } 1027 allocated_urbs++; 1028 } 1029 1030 if (!allocated_urbs) 1031 return -ENOMEM; 1032 1033 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1034 * 1035 * Register Index 1036 * 0 : THR/RHR 1037 * 1 : IER 1038 * 2 : FCR 1039 * 3 : LCR 1040 * 4 : MCR 1041 * 5 : LSR 1042 * 6 : MSR 1043 * 7 : SPR 1044 * 1045 * 0x08 : SP1/2 Control Reg 1046 */ 1047 port_number = port->number - port->serial->minor; 1048 read_mos_reg(serial, port_number, LSR, &data); 1049 1050 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1051 1052 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1053 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1054 1055 write_mos_reg(serial, port_number, IER, 0x00); 1056 write_mos_reg(serial, port_number, FCR, 0x00); 1057 1058 write_mos_reg(serial, port_number, FCR, 0xcf); 1059 mos7720_port->shadowLCR = 0x03; 1060 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1061 mos7720_port->shadowMCR = 0x0b; 1062 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1063 1064 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1065 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1066 data = data | (port->number - port->serial->minor + 1); 1067 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1068 mos7720_port->shadowLCR = 0x83; 1069 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1070 write_mos_reg(serial, port_number, THR, 0x0c); 1071 write_mos_reg(serial, port_number, IER, 0x00); 1072 mos7720_port->shadowLCR = 0x03; 1073 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1074 write_mos_reg(serial, port_number, IER, 0x0c); 1075 1076 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1077 if (response) 1078 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1079 __func__, response); 1080 1081 /* initialize our icount structure */ 1082 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1083 1084 /* initialize our port settings */ 1085 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1086 1087 /* send a open port command */ 1088 mos7720_port->open = 1; 1089 1090 return 0; 1091 } 1092 1093 /* 1094 * mos7720_chars_in_buffer 1095 * this function is called by the tty driver when it wants to know how many 1096 * bytes of data we currently have outstanding in the port (data that has 1097 * been written, but hasn't made it out the port yet) 1098 * If successful, we return the number of bytes left to be written in the 1099 * system, 1100 * Otherwise we return a negative error number. 1101 */ 1102 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1103 { 1104 struct usb_serial_port *port = tty->driver_data; 1105 int i; 1106 int chars = 0; 1107 struct moschip_port *mos7720_port; 1108 1109 mos7720_port = usb_get_serial_port_data(port); 1110 if (mos7720_port == NULL) 1111 return 0; 1112 1113 for (i = 0; i < NUM_URBS; ++i) { 1114 if (mos7720_port->write_urb_pool[i] && 1115 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1116 chars += URB_TRANSFER_BUFFER_SIZE; 1117 } 1118 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1119 return chars; 1120 } 1121 1122 static void mos7720_close(struct usb_serial_port *port) 1123 { 1124 struct usb_serial *serial; 1125 struct moschip_port *mos7720_port; 1126 int j; 1127 1128 serial = port->serial; 1129 1130 mos7720_port = usb_get_serial_port_data(port); 1131 if (mos7720_port == NULL) 1132 return; 1133 1134 for (j = 0; j < NUM_URBS; ++j) 1135 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1136 1137 /* Freeing Write URBs */ 1138 for (j = 0; j < NUM_URBS; ++j) { 1139 if (mos7720_port->write_urb_pool[j]) { 1140 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1141 usb_free_urb(mos7720_port->write_urb_pool[j]); 1142 } 1143 } 1144 1145 /* While closing port, shutdown all bulk read, write * 1146 * and interrupt read if they exists, otherwise nop */ 1147 usb_kill_urb(port->write_urb); 1148 usb_kill_urb(port->read_urb); 1149 1150 mutex_lock(&serial->disc_mutex); 1151 /* these commands must not be issued if the device has 1152 * been disconnected */ 1153 if (!serial->disconnected) { 1154 write_mos_reg(serial, port->number - port->serial->minor, 1155 MCR, 0x00); 1156 write_mos_reg(serial, port->number - port->serial->minor, 1157 IER, 0x00); 1158 } 1159 mutex_unlock(&serial->disc_mutex); 1160 mos7720_port->open = 0; 1161 } 1162 1163 static void mos7720_break(struct tty_struct *tty, int break_state) 1164 { 1165 struct usb_serial_port *port = tty->driver_data; 1166 unsigned char data; 1167 struct usb_serial *serial; 1168 struct moschip_port *mos7720_port; 1169 1170 serial = port->serial; 1171 1172 mos7720_port = usb_get_serial_port_data(port); 1173 if (mos7720_port == NULL) 1174 return; 1175 1176 if (break_state == -1) 1177 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1178 else 1179 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1180 1181 mos7720_port->shadowLCR = data; 1182 write_mos_reg(serial, port->number - port->serial->minor, 1183 LCR, mos7720_port->shadowLCR); 1184 } 1185 1186 /* 1187 * mos7720_write_room 1188 * this function is called by the tty driver when it wants to know how many 1189 * bytes of data we can accept for a specific port. 1190 * If successful, we return the amount of room that we have for this port 1191 * Otherwise we return a negative error number. 1192 */ 1193 static int mos7720_write_room(struct tty_struct *tty) 1194 { 1195 struct usb_serial_port *port = tty->driver_data; 1196 struct moschip_port *mos7720_port; 1197 int room = 0; 1198 int i; 1199 1200 mos7720_port = usb_get_serial_port_data(port); 1201 if (mos7720_port == NULL) 1202 return -ENODEV; 1203 1204 /* FIXME: Locking */ 1205 for (i = 0; i < NUM_URBS; ++i) { 1206 if (mos7720_port->write_urb_pool[i] && 1207 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1208 room += URB_TRANSFER_BUFFER_SIZE; 1209 } 1210 1211 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1212 return room; 1213 } 1214 1215 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1216 const unsigned char *data, int count) 1217 { 1218 int status; 1219 int i; 1220 int bytes_sent = 0; 1221 int transfer_size; 1222 1223 struct moschip_port *mos7720_port; 1224 struct usb_serial *serial; 1225 struct urb *urb; 1226 const unsigned char *current_position = data; 1227 1228 serial = port->serial; 1229 1230 mos7720_port = usb_get_serial_port_data(port); 1231 if (mos7720_port == NULL) 1232 return -ENODEV; 1233 1234 /* try to find a free urb in the list */ 1235 urb = NULL; 1236 1237 for (i = 0; i < NUM_URBS; ++i) { 1238 if (mos7720_port->write_urb_pool[i] && 1239 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1240 urb = mos7720_port->write_urb_pool[i]; 1241 dev_dbg(&port->dev, "URB:%d\n", i); 1242 break; 1243 } 1244 } 1245 1246 if (urb == NULL) { 1247 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1248 goto exit; 1249 } 1250 1251 if (urb->transfer_buffer == NULL) { 1252 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1253 GFP_KERNEL); 1254 if (urb->transfer_buffer == NULL) { 1255 dev_err_console(port, "%s no more kernel memory...\n", 1256 __func__); 1257 goto exit; 1258 } 1259 } 1260 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1261 1262 memcpy(urb->transfer_buffer, current_position, transfer_size); 1263 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1264 urb->transfer_buffer); 1265 1266 /* fill urb with data and submit */ 1267 usb_fill_bulk_urb(urb, serial->dev, 1268 usb_sndbulkpipe(serial->dev, 1269 port->bulk_out_endpointAddress), 1270 urb->transfer_buffer, transfer_size, 1271 mos7720_bulk_out_data_callback, mos7720_port); 1272 1273 /* send it down the pipe */ 1274 status = usb_submit_urb(urb, GFP_ATOMIC); 1275 if (status) { 1276 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1277 "with status = %d\n", __func__, status); 1278 bytes_sent = status; 1279 goto exit; 1280 } 1281 bytes_sent = transfer_size; 1282 1283 exit: 1284 return bytes_sent; 1285 } 1286 1287 static void mos7720_throttle(struct tty_struct *tty) 1288 { 1289 struct usb_serial_port *port = tty->driver_data; 1290 struct moschip_port *mos7720_port; 1291 int status; 1292 1293 mos7720_port = usb_get_serial_port_data(port); 1294 1295 if (mos7720_port == NULL) 1296 return; 1297 1298 if (!mos7720_port->open) { 1299 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1300 return; 1301 } 1302 1303 /* if we are implementing XON/XOFF, send the stop character */ 1304 if (I_IXOFF(tty)) { 1305 unsigned char stop_char = STOP_CHAR(tty); 1306 status = mos7720_write(tty, port, &stop_char, 1); 1307 if (status <= 0) 1308 return; 1309 } 1310 1311 /* if we are implementing RTS/CTS, toggle that line */ 1312 if (tty->termios.c_cflag & CRTSCTS) { 1313 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1314 write_mos_reg(port->serial, port->number - port->serial->minor, 1315 MCR, mos7720_port->shadowMCR); 1316 if (status != 0) 1317 return; 1318 } 1319 } 1320 1321 static void mos7720_unthrottle(struct tty_struct *tty) 1322 { 1323 struct usb_serial_port *port = tty->driver_data; 1324 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1325 int status; 1326 1327 if (mos7720_port == NULL) 1328 return; 1329 1330 if (!mos7720_port->open) { 1331 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1332 return; 1333 } 1334 1335 /* if we are implementing XON/XOFF, send the start character */ 1336 if (I_IXOFF(tty)) { 1337 unsigned char start_char = START_CHAR(tty); 1338 status = mos7720_write(tty, port, &start_char, 1); 1339 if (status <= 0) 1340 return; 1341 } 1342 1343 /* if we are implementing RTS/CTS, toggle that line */ 1344 if (tty->termios.c_cflag & CRTSCTS) { 1345 mos7720_port->shadowMCR |= UART_MCR_RTS; 1346 write_mos_reg(port->serial, port->number - port->serial->minor, 1347 MCR, mos7720_port->shadowMCR); 1348 if (status != 0) 1349 return; 1350 } 1351 } 1352 1353 /* FIXME: this function does not work */ 1354 static int set_higher_rates(struct moschip_port *mos7720_port, 1355 unsigned int baud) 1356 { 1357 struct usb_serial_port *port; 1358 struct usb_serial *serial; 1359 int port_number; 1360 enum mos_regs sp_reg; 1361 if (mos7720_port == NULL) 1362 return -EINVAL; 1363 1364 port = mos7720_port->port; 1365 serial = port->serial; 1366 1367 /*********************************************** 1368 * Init Sequence for higher rates 1369 ***********************************************/ 1370 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1371 port_number = port->number - port->serial->minor; 1372 1373 write_mos_reg(serial, port_number, IER, 0x00); 1374 write_mos_reg(serial, port_number, FCR, 0x00); 1375 write_mos_reg(serial, port_number, FCR, 0xcf); 1376 mos7720_port->shadowMCR = 0x0b; 1377 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1378 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1379 1380 /*********************************************** 1381 * Set for higher rates * 1382 ***********************************************/ 1383 /* writing baud rate verbatum into uart clock field clearly not right */ 1384 if (port_number == 0) 1385 sp_reg = SP1_REG; 1386 else 1387 sp_reg = SP2_REG; 1388 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1389 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1390 mos7720_port->shadowMCR = 0x2b; 1391 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1392 1393 /*********************************************** 1394 * Set DLL/DLM 1395 ***********************************************/ 1396 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1397 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1398 write_mos_reg(serial, port_number, DLL, 0x01); 1399 write_mos_reg(serial, port_number, DLM, 0x00); 1400 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1401 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1402 1403 return 0; 1404 } 1405 1406 /* baud rate information */ 1407 struct divisor_table_entry { 1408 __u32 baudrate; 1409 __u16 divisor; 1410 }; 1411 1412 /* Define table of divisors for moschip 7720 hardware * 1413 * These assume a 3.6864MHz crystal, the standard /16, and * 1414 * MCR.7 = 0. */ 1415 static struct divisor_table_entry divisor_table[] = { 1416 { 50, 2304}, 1417 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1418 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1419 { 150, 768}, 1420 { 300, 384}, 1421 { 600, 192}, 1422 { 1200, 96}, 1423 { 1800, 64}, 1424 { 2400, 48}, 1425 { 4800, 24}, 1426 { 7200, 16}, 1427 { 9600, 12}, 1428 { 19200, 6}, 1429 { 38400, 3}, 1430 { 57600, 2}, 1431 { 115200, 1}, 1432 }; 1433 1434 /***************************************************************************** 1435 * calc_baud_rate_divisor 1436 * this function calculates the proper baud rate divisor for the specified 1437 * baud rate. 1438 *****************************************************************************/ 1439 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1440 { 1441 int i; 1442 __u16 custom; 1443 __u16 round1; 1444 __u16 round; 1445 1446 1447 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1448 1449 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1450 if (divisor_table[i].baudrate == baudrate) { 1451 *divisor = divisor_table[i].divisor; 1452 return 0; 1453 } 1454 } 1455 1456 /* After trying for all the standard baud rates * 1457 * Try calculating the divisor for this baud rate */ 1458 if (baudrate > 75 && baudrate < 230400) { 1459 /* get the divisor */ 1460 custom = (__u16)(230400L / baudrate); 1461 1462 /* Check for round off */ 1463 round1 = (__u16)(2304000L / baudrate); 1464 round = (__u16)(round1 - (custom * 10)); 1465 if (round > 4) 1466 custom++; 1467 *divisor = custom; 1468 1469 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1470 return 0; 1471 } 1472 1473 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1474 return -EINVAL; 1475 } 1476 1477 /* 1478 * send_cmd_write_baud_rate 1479 * this function sends the proper command to change the baud rate of the 1480 * specified port. 1481 */ 1482 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1483 int baudrate) 1484 { 1485 struct usb_serial_port *port; 1486 struct usb_serial *serial; 1487 int divisor; 1488 int status; 1489 unsigned char number; 1490 1491 if (mos7720_port == NULL) 1492 return -1; 1493 1494 port = mos7720_port->port; 1495 serial = port->serial; 1496 1497 number = port->number - port->serial->minor; 1498 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1499 1500 /* Calculate the Divisor */ 1501 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1502 if (status) { 1503 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1504 return status; 1505 } 1506 1507 /* Enable access to divisor latch */ 1508 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1509 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1510 1511 /* Write the divisor */ 1512 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1513 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1514 1515 /* Disable access to divisor latch */ 1516 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1517 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1518 1519 return status; 1520 } 1521 1522 /* 1523 * change_port_settings 1524 * This routine is called to set the UART on the device to match 1525 * the specified new settings. 1526 */ 1527 static void change_port_settings(struct tty_struct *tty, 1528 struct moschip_port *mos7720_port, 1529 struct ktermios *old_termios) 1530 { 1531 struct usb_serial_port *port; 1532 struct usb_serial *serial; 1533 int baud; 1534 unsigned cflag; 1535 unsigned iflag; 1536 __u8 mask = 0xff; 1537 __u8 lData; 1538 __u8 lParity; 1539 __u8 lStop; 1540 int status; 1541 int port_number; 1542 1543 if (mos7720_port == NULL) 1544 return ; 1545 1546 port = mos7720_port->port; 1547 serial = port->serial; 1548 port_number = port->number - port->serial->minor; 1549 1550 if (!mos7720_port->open) { 1551 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1552 return; 1553 } 1554 1555 lData = UART_LCR_WLEN8; 1556 lStop = 0x00; /* 1 stop bit */ 1557 lParity = 0x00; /* No parity */ 1558 1559 cflag = tty->termios.c_cflag; 1560 iflag = tty->termios.c_iflag; 1561 1562 /* Change the number of bits */ 1563 switch (cflag & CSIZE) { 1564 case CS5: 1565 lData = UART_LCR_WLEN5; 1566 mask = 0x1f; 1567 break; 1568 1569 case CS6: 1570 lData = UART_LCR_WLEN6; 1571 mask = 0x3f; 1572 break; 1573 1574 case CS7: 1575 lData = UART_LCR_WLEN7; 1576 mask = 0x7f; 1577 break; 1578 default: 1579 case CS8: 1580 lData = UART_LCR_WLEN8; 1581 break; 1582 } 1583 1584 /* Change the Parity bit */ 1585 if (cflag & PARENB) { 1586 if (cflag & PARODD) { 1587 lParity = UART_LCR_PARITY; 1588 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1589 } else { 1590 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1591 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1592 } 1593 1594 } else { 1595 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1596 } 1597 1598 if (cflag & CMSPAR) 1599 lParity = lParity | 0x20; 1600 1601 /* Change the Stop bit */ 1602 if (cflag & CSTOPB) { 1603 lStop = UART_LCR_STOP; 1604 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1605 } else { 1606 lStop = 0x00; 1607 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1608 } 1609 1610 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1611 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1612 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1613 1614 /* Update the LCR with the correct value */ 1615 mos7720_port->shadowLCR &= 1616 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1617 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1618 1619 1620 /* Disable Interrupts */ 1621 write_mos_reg(serial, port_number, IER, 0x00); 1622 write_mos_reg(serial, port_number, FCR, 0x00); 1623 write_mos_reg(serial, port_number, FCR, 0xcf); 1624 1625 /* Send the updated LCR value to the mos7720 */ 1626 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1627 mos7720_port->shadowMCR = 0x0b; 1628 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1629 1630 /* set up the MCR register and send it to the mos7720 */ 1631 mos7720_port->shadowMCR = UART_MCR_OUT2; 1632 if (cflag & CBAUD) 1633 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1634 1635 if (cflag & CRTSCTS) { 1636 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1637 /* To set hardware flow control to the specified * 1638 * serial port, in SP1/2_CONTROL_REG */ 1639 if (port->number) 1640 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1641 else 1642 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1643 1644 } else 1645 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1646 1647 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1648 1649 /* Determine divisor based on baud rate */ 1650 baud = tty_get_baud_rate(tty); 1651 if (!baud) { 1652 /* pick a default, any default... */ 1653 dev_dbg(&port->dev, "Picked default baud...\n"); 1654 baud = 9600; 1655 } 1656 1657 if (baud >= 230400) { 1658 set_higher_rates(mos7720_port, baud); 1659 /* Enable Interrupts */ 1660 write_mos_reg(serial, port_number, IER, 0x0c); 1661 return; 1662 } 1663 1664 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1665 status = send_cmd_write_baud_rate(mos7720_port, baud); 1666 /* FIXME: needs to write actual resulting baud back not just 1667 blindly do so */ 1668 if (cflag & CBAUD) 1669 tty_encode_baud_rate(tty, baud, baud); 1670 /* Enable Interrupts */ 1671 write_mos_reg(serial, port_number, IER, 0x0c); 1672 1673 if (port->read_urb->status != -EINPROGRESS) { 1674 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1675 if (status) 1676 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1677 } 1678 } 1679 1680 /* 1681 * mos7720_set_termios 1682 * this function is called by the tty driver when it wants to change the 1683 * termios structure. 1684 */ 1685 static void mos7720_set_termios(struct tty_struct *tty, 1686 struct usb_serial_port *port, struct ktermios *old_termios) 1687 { 1688 int status; 1689 unsigned int cflag; 1690 struct usb_serial *serial; 1691 struct moschip_port *mos7720_port; 1692 1693 serial = port->serial; 1694 1695 mos7720_port = usb_get_serial_port_data(port); 1696 1697 if (mos7720_port == NULL) 1698 return; 1699 1700 if (!mos7720_port->open) { 1701 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1702 return; 1703 } 1704 1705 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1706 1707 cflag = tty->termios.c_cflag; 1708 1709 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1710 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1711 1712 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1713 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1714 1715 /* change the port settings to the new ones specified */ 1716 change_port_settings(tty, mos7720_port, old_termios); 1717 1718 if (port->read_urb->status != -EINPROGRESS) { 1719 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1720 if (status) 1721 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1722 } 1723 } 1724 1725 /* 1726 * get_lsr_info - get line status register info 1727 * 1728 * Purpose: Let user call ioctl() to get info when the UART physically 1729 * is emptied. On bus types like RS485, the transmitter must 1730 * release the bus after transmitting. This must be done when 1731 * the transmit shift register is empty, not be done when the 1732 * transmit holding register is empty. This functionality 1733 * allows an RS485 driver to be written in user space. 1734 */ 1735 static int get_lsr_info(struct tty_struct *tty, 1736 struct moschip_port *mos7720_port, unsigned int __user *value) 1737 { 1738 struct usb_serial_port *port = tty->driver_data; 1739 unsigned int result = 0; 1740 unsigned char data = 0; 1741 int port_number = port->number - port->serial->minor; 1742 int count; 1743 1744 count = mos7720_chars_in_buffer(tty); 1745 if (count == 0) { 1746 read_mos_reg(port->serial, port_number, LSR, &data); 1747 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1748 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1749 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1750 result = TIOCSER_TEMT; 1751 } 1752 } 1753 if (copy_to_user(value, &result, sizeof(int))) 1754 return -EFAULT; 1755 return 0; 1756 } 1757 1758 static int mos7720_tiocmget(struct tty_struct *tty) 1759 { 1760 struct usb_serial_port *port = tty->driver_data; 1761 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1762 unsigned int result = 0; 1763 unsigned int mcr ; 1764 unsigned int msr ; 1765 1766 mcr = mos7720_port->shadowMCR; 1767 msr = mos7720_port->shadowMSR; 1768 1769 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1770 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1771 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1772 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1773 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1774 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1775 1776 return result; 1777 } 1778 1779 static int mos7720_tiocmset(struct tty_struct *tty, 1780 unsigned int set, unsigned int clear) 1781 { 1782 struct usb_serial_port *port = tty->driver_data; 1783 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1784 unsigned int mcr ; 1785 1786 mcr = mos7720_port->shadowMCR; 1787 1788 if (set & TIOCM_RTS) 1789 mcr |= UART_MCR_RTS; 1790 if (set & TIOCM_DTR) 1791 mcr |= UART_MCR_DTR; 1792 if (set & TIOCM_LOOP) 1793 mcr |= UART_MCR_LOOP; 1794 1795 if (clear & TIOCM_RTS) 1796 mcr &= ~UART_MCR_RTS; 1797 if (clear & TIOCM_DTR) 1798 mcr &= ~UART_MCR_DTR; 1799 if (clear & TIOCM_LOOP) 1800 mcr &= ~UART_MCR_LOOP; 1801 1802 mos7720_port->shadowMCR = mcr; 1803 write_mos_reg(port->serial, port->number - port->serial->minor, 1804 MCR, mos7720_port->shadowMCR); 1805 1806 return 0; 1807 } 1808 1809 static int mos7720_get_icount(struct tty_struct *tty, 1810 struct serial_icounter_struct *icount) 1811 { 1812 struct usb_serial_port *port = tty->driver_data; 1813 struct moschip_port *mos7720_port; 1814 struct async_icount cnow; 1815 1816 mos7720_port = usb_get_serial_port_data(port); 1817 cnow = mos7720_port->icount; 1818 1819 icount->cts = cnow.cts; 1820 icount->dsr = cnow.dsr; 1821 icount->rng = cnow.rng; 1822 icount->dcd = cnow.dcd; 1823 icount->rx = cnow.rx; 1824 icount->tx = cnow.tx; 1825 icount->frame = cnow.frame; 1826 icount->overrun = cnow.overrun; 1827 icount->parity = cnow.parity; 1828 icount->brk = cnow.brk; 1829 icount->buf_overrun = cnow.buf_overrun; 1830 1831 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__, 1832 icount->rx, icount->tx); 1833 return 0; 1834 } 1835 1836 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1837 unsigned int __user *value) 1838 { 1839 unsigned int mcr; 1840 unsigned int arg; 1841 1842 struct usb_serial_port *port; 1843 1844 if (mos7720_port == NULL) 1845 return -1; 1846 1847 port = (struct usb_serial_port *)mos7720_port->port; 1848 mcr = mos7720_port->shadowMCR; 1849 1850 if (copy_from_user(&arg, value, sizeof(int))) 1851 return -EFAULT; 1852 1853 switch (cmd) { 1854 case TIOCMBIS: 1855 if (arg & TIOCM_RTS) 1856 mcr |= UART_MCR_RTS; 1857 if (arg & TIOCM_DTR) 1858 mcr |= UART_MCR_RTS; 1859 if (arg & TIOCM_LOOP) 1860 mcr |= UART_MCR_LOOP; 1861 break; 1862 1863 case TIOCMBIC: 1864 if (arg & TIOCM_RTS) 1865 mcr &= ~UART_MCR_RTS; 1866 if (arg & TIOCM_DTR) 1867 mcr &= ~UART_MCR_RTS; 1868 if (arg & TIOCM_LOOP) 1869 mcr &= ~UART_MCR_LOOP; 1870 break; 1871 1872 } 1873 1874 mos7720_port->shadowMCR = mcr; 1875 write_mos_reg(port->serial, port->number - port->serial->minor, 1876 MCR, mos7720_port->shadowMCR); 1877 1878 return 0; 1879 } 1880 1881 static int get_serial_info(struct moschip_port *mos7720_port, 1882 struct serial_struct __user *retinfo) 1883 { 1884 struct serial_struct tmp; 1885 1886 if (!retinfo) 1887 return -EFAULT; 1888 1889 memset(&tmp, 0, sizeof(tmp)); 1890 1891 tmp.type = PORT_16550A; 1892 tmp.line = mos7720_port->port->serial->minor; 1893 tmp.port = mos7720_port->port->number; 1894 tmp.irq = 0; 1895 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1896 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1897 tmp.baud_base = 9600; 1898 tmp.close_delay = 5*HZ; 1899 tmp.closing_wait = 30*HZ; 1900 1901 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1902 return -EFAULT; 1903 return 0; 1904 } 1905 1906 static int mos7720_ioctl(struct tty_struct *tty, 1907 unsigned int cmd, unsigned long arg) 1908 { 1909 struct usb_serial_port *port = tty->driver_data; 1910 struct moschip_port *mos7720_port; 1911 struct async_icount cnow; 1912 struct async_icount cprev; 1913 1914 mos7720_port = usb_get_serial_port_data(port); 1915 if (mos7720_port == NULL) 1916 return -ENODEV; 1917 1918 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1919 1920 switch (cmd) { 1921 case TIOCSERGETLSR: 1922 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1923 return get_lsr_info(tty, mos7720_port, 1924 (unsigned int __user *)arg); 1925 1926 /* FIXME: These should be using the mode methods */ 1927 case TIOCMBIS: 1928 case TIOCMBIC: 1929 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1930 return set_modem_info(mos7720_port, cmd, 1931 (unsigned int __user *)arg); 1932 1933 case TIOCGSERIAL: 1934 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1935 return get_serial_info(mos7720_port, 1936 (struct serial_struct __user *)arg); 1937 1938 case TIOCMIWAIT: 1939 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__); 1940 cprev = mos7720_port->icount; 1941 while (1) { 1942 if (signal_pending(current)) 1943 return -ERESTARTSYS; 1944 cnow = mos7720_port->icount; 1945 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1946 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1947 return -EIO; /* no change => error */ 1948 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1949 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1950 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1951 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1952 return 0; 1953 } 1954 cprev = cnow; 1955 } 1956 /* NOTREACHED */ 1957 break; 1958 } 1959 1960 return -ENOIOCTLCMD; 1961 } 1962 1963 static int mos7720_startup(struct usb_serial *serial) 1964 { 1965 struct usb_device *dev; 1966 char data; 1967 u16 product; 1968 int ret_val; 1969 1970 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1971 dev = serial->dev; 1972 1973 /* 1974 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1975 * port, and the second for the serial port. Because the usbserial core 1976 * assumes both pairs are serial ports, we must engage in a bit of 1977 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1978 * port 0 point to the serial port. However, both moschip devices use a 1979 * single interrupt-in endpoint for both ports (as mentioned a little 1980 * further down), and this endpoint was assigned to port 0. So after 1981 * the swap, we must copy the interrupt endpoint elements from port 1 1982 * (as newly assigned) to port 0, and null out port 1 pointers. 1983 */ 1984 if (product == MOSCHIP_DEVICE_ID_7715) { 1985 struct usb_serial_port *tmp = serial->port[0]; 1986 serial->port[0] = serial->port[1]; 1987 serial->port[1] = tmp; 1988 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1989 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1990 serial->port[0]->interrupt_in_endpointAddress = 1991 tmp->interrupt_in_endpointAddress; 1992 serial->port[1]->interrupt_in_urb = NULL; 1993 serial->port[1]->interrupt_in_buffer = NULL; 1994 } 1995 1996 /* setting configuration feature to one */ 1997 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1998 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 1999 2000 /* start the interrupt urb */ 2001 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 2002 if (ret_val) 2003 dev_err(&dev->dev, 2004 "%s - Error %d submitting control urb\n", 2005 __func__, ret_val); 2006 2007 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2008 if (product == MOSCHIP_DEVICE_ID_7715) { 2009 ret_val = mos7715_parport_init(serial); 2010 if (ret_val < 0) 2011 return ret_val; 2012 } 2013 #endif 2014 /* LSR For Port 1 */ 2015 read_mos_reg(serial, 0, LSR, &data); 2016 dev_dbg(&dev->dev, "LSR:%x\n", data); 2017 2018 return 0; 2019 } 2020 2021 static void mos7720_release(struct usb_serial *serial) 2022 { 2023 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2024 /* close the parallel port */ 2025 2026 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2027 == MOSCHIP_DEVICE_ID_7715) { 2028 struct urbtracker *urbtrack; 2029 unsigned long flags; 2030 struct mos7715_parport *mos_parport = 2031 usb_get_serial_data(serial); 2032 2033 /* prevent NULL ptr dereference in port callbacks */ 2034 spin_lock(&release_lock); 2035 mos_parport->pp->private_data = NULL; 2036 spin_unlock(&release_lock); 2037 2038 /* wait for synchronous usb calls to return */ 2039 if (mos_parport->msg_pending) 2040 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2041 MOS_WDR_TIMEOUT); 2042 2043 parport_remove_port(mos_parport->pp); 2044 usb_set_serial_data(serial, NULL); 2045 mos_parport->serial = NULL; 2046 2047 /* if tasklet currently scheduled, wait for it to complete */ 2048 tasklet_kill(&mos_parport->urb_tasklet); 2049 2050 /* unlink any urbs sent by the tasklet */ 2051 spin_lock_irqsave(&mos_parport->listlock, flags); 2052 list_for_each_entry(urbtrack, 2053 &mos_parport->active_urbs, 2054 urblist_entry) 2055 usb_unlink_urb(urbtrack->urb); 2056 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2057 2058 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2059 } 2060 #endif 2061 } 2062 2063 static int mos7720_port_probe(struct usb_serial_port *port) 2064 { 2065 struct moschip_port *mos7720_port; 2066 2067 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2068 if (!mos7720_port) 2069 return -ENOMEM; 2070 2071 /* Initialize all port interrupt end point to port 0 int endpoint. 2072 * Our device has only one interrupt endpoint common to all ports. 2073 */ 2074 port->interrupt_in_endpointAddress = 2075 port->serial->port[0]->interrupt_in_endpointAddress; 2076 mos7720_port->port = port; 2077 2078 usb_set_serial_port_data(port, mos7720_port); 2079 2080 return 0; 2081 } 2082 2083 static int mos7720_port_remove(struct usb_serial_port *port) 2084 { 2085 struct moschip_port *mos7720_port; 2086 2087 mos7720_port = usb_get_serial_port_data(port); 2088 kfree(mos7720_port); 2089 2090 return 0; 2091 } 2092 2093 static struct usb_serial_driver moschip7720_2port_driver = { 2094 .driver = { 2095 .owner = THIS_MODULE, 2096 .name = "moschip7720", 2097 }, 2098 .description = "Moschip 2 port adapter", 2099 .id_table = id_table, 2100 .calc_num_ports = mos77xx_calc_num_ports, 2101 .open = mos7720_open, 2102 .close = mos7720_close, 2103 .throttle = mos7720_throttle, 2104 .unthrottle = mos7720_unthrottle, 2105 .probe = mos77xx_probe, 2106 .attach = mos7720_startup, 2107 .release = mos7720_release, 2108 .port_probe = mos7720_port_probe, 2109 .port_remove = mos7720_port_remove, 2110 .ioctl = mos7720_ioctl, 2111 .tiocmget = mos7720_tiocmget, 2112 .tiocmset = mos7720_tiocmset, 2113 .get_icount = mos7720_get_icount, 2114 .set_termios = mos7720_set_termios, 2115 .write = mos7720_write, 2116 .write_room = mos7720_write_room, 2117 .chars_in_buffer = mos7720_chars_in_buffer, 2118 .break_ctl = mos7720_break, 2119 .read_bulk_callback = mos7720_bulk_in_callback, 2120 .read_int_callback = NULL /* dynamically assigned in probe() */ 2121 }; 2122 2123 static struct usb_serial_driver * const serial_drivers[] = { 2124 &moschip7720_2port_driver, NULL 2125 }; 2126 2127 module_usb_serial_driver(serial_drivers, id_table); 2128 2129 MODULE_AUTHOR(DRIVER_AUTHOR); 2130 MODULE_DESCRIPTION(DRIVER_DESC); 2131 MODULE_LICENSE("GPL"); 2132