1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial convertor 4 * 5 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, version 2 of the License. 10 * 11 * Developed by: 12 * Vijaya Kumar <vijaykumar.gn@gmail.com> 13 * Ajay Kumar <naanuajay@yahoo.com> 14 * Gurudeva <ngurudeva@yahoo.com> 15 * 16 * Cleaned up from the original by: 17 * Greg Kroah-Hartman <gregkh@suse.de> 18 * 19 * Originally based on drivers/usb/serial/io_edgeport.c which is: 20 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 22 */ 23 #include <linux/kernel.h> 24 #include <linux/errno.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/tty.h> 28 #include <linux/tty_driver.h> 29 #include <linux/tty_flip.h> 30 #include <linux/module.h> 31 #include <linux/spinlock.h> 32 #include <linux/serial.h> 33 #include <linux/serial_reg.h> 34 #include <linux/usb.h> 35 #include <linux/usb/serial.h> 36 #include <linux/uaccess.h> 37 #include <linux/parport.h> 38 39 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 40 #define DRIVER_DESC "Moschip USB Serial Driver" 41 42 /* default urb timeout */ 43 #define MOS_WDR_TIMEOUT 5000 44 45 #define MOS_MAX_PORT 0x02 46 #define MOS_WRITE 0x0E 47 #define MOS_READ 0x0D 48 49 /* Interrupt Rotinue Defines */ 50 #define SERIAL_IIR_RLS 0x06 51 #define SERIAL_IIR_RDA 0x04 52 #define SERIAL_IIR_CTI 0x0c 53 #define SERIAL_IIR_THR 0x02 54 #define SERIAL_IIR_MS 0x00 55 56 #define NUM_URBS 16 /* URB Count */ 57 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 58 59 /* This structure holds all of the local serial port information */ 60 struct moschip_port { 61 __u8 shadowLCR; /* last LCR value received */ 62 __u8 shadowMCR; /* last MCR value received */ 63 __u8 shadowMSR; /* last MSR value received */ 64 char open; 65 struct usb_serial_port *port; /* loop back to the owner */ 66 struct urb *write_urb_pool[NUM_URBS]; 67 }; 68 69 static struct usb_serial_driver moschip7720_2port_driver; 70 71 #define USB_VENDOR_ID_MOSCHIP 0x9710 72 #define MOSCHIP_DEVICE_ID_7720 0x7720 73 #define MOSCHIP_DEVICE_ID_7715 0x7715 74 75 static const struct usb_device_id id_table[] = { 76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 78 { } /* terminating entry */ 79 }; 80 MODULE_DEVICE_TABLE(usb, id_table); 81 82 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 83 84 /* initial values for parport regs */ 85 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 86 #define ECR_INIT_VAL 0x00 /* SPP mode */ 87 88 struct urbtracker { 89 struct mos7715_parport *mos_parport; 90 struct list_head urblist_entry; 91 struct kref ref_count; 92 struct urb *urb; 93 struct usb_ctrlrequest *setup; 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 u8 *buf; 232 int status; 233 234 buf = kmalloc(1, GFP_KERNEL); 235 if (!buf) 236 return -ENOMEM; 237 238 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 239 index, buf, 1, MOS_WDR_TIMEOUT); 240 if (status == 1) 241 *data = *buf; 242 else if (status < 0) 243 dev_err(&usbdev->dev, 244 "mos7720: usb_control_msg() failed: %d", status); 245 kfree(buf); 246 247 return status; 248 } 249 250 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 251 252 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 253 enum mos7715_pp_modes mode) 254 { 255 mos_parport->shadowECR = mode; 256 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 257 return 0; 258 } 259 260 static void destroy_mos_parport(struct kref *kref) 261 { 262 struct mos7715_parport *mos_parport = 263 container_of(kref, struct mos7715_parport, ref_count); 264 265 kfree(mos_parport); 266 } 267 268 static void destroy_urbtracker(struct kref *kref) 269 { 270 struct urbtracker *urbtrack = 271 container_of(kref, struct urbtracker, ref_count); 272 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 273 274 usb_free_urb(urbtrack->urb); 275 kfree(urbtrack->setup); 276 kfree(urbtrack); 277 kref_put(&mos_parport->ref_count, destroy_mos_parport); 278 } 279 280 /* 281 * This runs as a tasklet when sending an urb in a non-blocking parallel 282 * port callback had to be deferred because the disconnect mutex could not be 283 * obtained at the time. 284 */ 285 static void send_deferred_urbs(unsigned long _mos_parport) 286 { 287 int ret_val; 288 unsigned long flags; 289 struct mos7715_parport *mos_parport = (void *)_mos_parport; 290 struct urbtracker *urbtrack, *tmp; 291 struct list_head *cursor, *next; 292 struct device *dev; 293 294 /* if release function ran, game over */ 295 if (unlikely(mos_parport->serial == NULL)) 296 return; 297 298 dev = &mos_parport->serial->dev->dev; 299 300 /* try again to get the mutex */ 301 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 302 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 303 tasklet_schedule(&mos_parport->urb_tasklet); 304 return; 305 } 306 307 /* if device disconnected, game over */ 308 if (unlikely(mos_parport->serial->disconnected)) { 309 mutex_unlock(&mos_parport->serial->disc_mutex); 310 return; 311 } 312 313 spin_lock_irqsave(&mos_parport->listlock, flags); 314 if (list_empty(&mos_parport->deferred_urbs)) { 315 spin_unlock_irqrestore(&mos_parport->listlock, flags); 316 mutex_unlock(&mos_parport->serial->disc_mutex); 317 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 318 return; 319 } 320 321 /* move contents of deferred_urbs list to active_urbs list and submit */ 322 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 323 list_move_tail(cursor, &mos_parport->active_urbs); 324 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 325 urblist_entry) { 326 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 327 dev_dbg(dev, "%s: urb submitted\n", __func__); 328 if (ret_val) { 329 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 330 list_del(&urbtrack->urblist_entry); 331 kref_put(&urbtrack->ref_count, destroy_urbtracker); 332 } 333 } 334 spin_unlock_irqrestore(&mos_parport->listlock, flags); 335 mutex_unlock(&mos_parport->serial->disc_mutex); 336 } 337 338 /* callback for parallel port control urbs submitted asynchronously */ 339 static void async_complete(struct urb *urb) 340 { 341 struct urbtracker *urbtrack = urb->context; 342 int status = urb->status; 343 344 if (unlikely(status)) 345 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 346 347 /* remove the urbtracker from the active_urbs list */ 348 spin_lock(&urbtrack->mos_parport->listlock); 349 list_del(&urbtrack->urblist_entry); 350 spin_unlock(&urbtrack->mos_parport->listlock); 351 kref_put(&urbtrack->ref_count, destroy_urbtracker); 352 } 353 354 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 355 enum mos_regs reg, __u8 data) 356 { 357 struct urbtracker *urbtrack; 358 int ret_val; 359 unsigned long flags; 360 struct usb_serial *serial = mos_parport->serial; 361 struct usb_device *usbdev = serial->dev; 362 363 /* create and initialize the control urb and containing urbtracker */ 364 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 365 if (urbtrack == NULL) { 366 dev_err(&usbdev->dev, "out of memory"); 367 return -ENOMEM; 368 } 369 kref_get(&mos_parport->ref_count); 370 urbtrack->mos_parport = mos_parport; 371 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 372 if (urbtrack->urb == NULL) { 373 dev_err(&usbdev->dev, "out of urbs"); 374 kfree(urbtrack); 375 return -ENOMEM; 376 } 377 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC); 378 if (!urbtrack->setup) { 379 usb_free_urb(urbtrack->urb); 380 kfree(urbtrack); 381 return -ENOMEM; 382 } 383 urbtrack->setup->bRequestType = (__u8)0x40; 384 urbtrack->setup->bRequest = (__u8)0x0e; 385 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy)); 386 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg)); 387 urbtrack->setup->wLength = 0; 388 usb_fill_control_urb(urbtrack->urb, usbdev, 389 usb_sndctrlpipe(usbdev, 0), 390 (unsigned char *)urbtrack->setup, 391 NULL, 0, async_complete, urbtrack); 392 kref_init(&urbtrack->ref_count); 393 INIT_LIST_HEAD(&urbtrack->urblist_entry); 394 395 /* 396 * get the disconnect mutex, or add tracker to the deferred_urbs list 397 * and schedule a tasklet to try again later 398 */ 399 if (!mutex_trylock(&serial->disc_mutex)) { 400 spin_lock_irqsave(&mos_parport->listlock, flags); 401 list_add_tail(&urbtrack->urblist_entry, 402 &mos_parport->deferred_urbs); 403 spin_unlock_irqrestore(&mos_parport->listlock, flags); 404 tasklet_schedule(&mos_parport->urb_tasklet); 405 dev_dbg(&usbdev->dev, "tasklet scheduled"); 406 return 0; 407 } 408 409 /* bail if device disconnected */ 410 if (serial->disconnected) { 411 kref_put(&urbtrack->ref_count, destroy_urbtracker); 412 mutex_unlock(&serial->disc_mutex); 413 return -ENODEV; 414 } 415 416 /* add the tracker to the active_urbs list and submit */ 417 spin_lock_irqsave(&mos_parport->listlock, flags); 418 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 419 spin_unlock_irqrestore(&mos_parport->listlock, flags); 420 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 421 mutex_unlock(&serial->disc_mutex); 422 if (ret_val) { 423 dev_err(&usbdev->dev, 424 "%s: submit_urb() failed: %d", __func__, ret_val); 425 spin_lock_irqsave(&mos_parport->listlock, flags); 426 list_del(&urbtrack->urblist_entry); 427 spin_unlock_irqrestore(&mos_parport->listlock, flags); 428 kref_put(&urbtrack->ref_count, destroy_urbtracker); 429 return ret_val; 430 } 431 return 0; 432 } 433 434 /* 435 * This is the the common top part of all parallel port callback operations that 436 * send synchronous messages to the device. This implements convoluted locking 437 * that avoids two scenarios: (1) a port operation is called after usbserial 438 * has called our release function, at which point struct mos7715_parport has 439 * been destroyed, and (2) the device has been disconnected, but usbserial has 440 * not called the release function yet because someone has a serial port open. 441 * The shared release_lock prevents the first, and the mutex and disconnected 442 * flag maintained by usbserial covers the second. We also use the msg_pending 443 * flag to ensure that all synchronous usb messgage calls have completed before 444 * our release function can return. 445 */ 446 static int parport_prologue(struct parport *pp) 447 { 448 struct mos7715_parport *mos_parport; 449 450 spin_lock(&release_lock); 451 mos_parport = pp->private_data; 452 if (unlikely(mos_parport == NULL)) { 453 /* release fn called, port struct destroyed */ 454 spin_unlock(&release_lock); 455 return -1; 456 } 457 mos_parport->msg_pending = true; /* synch usb call pending */ 458 reinit_completion(&mos_parport->syncmsg_compl); 459 spin_unlock(&release_lock); 460 461 mutex_lock(&mos_parport->serial->disc_mutex); 462 if (mos_parport->serial->disconnected) { 463 /* device disconnected */ 464 mutex_unlock(&mos_parport->serial->disc_mutex); 465 mos_parport->msg_pending = false; 466 complete(&mos_parport->syncmsg_compl); 467 return -1; 468 } 469 470 return 0; 471 } 472 473 /* 474 * This is the the common bottom part of all parallel port functions that send 475 * synchronous messages to the device. 476 */ 477 static inline void parport_epilogue(struct parport *pp) 478 { 479 struct mos7715_parport *mos_parport = pp->private_data; 480 mutex_unlock(&mos_parport->serial->disc_mutex); 481 mos_parport->msg_pending = false; 482 complete(&mos_parport->syncmsg_compl); 483 } 484 485 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 486 { 487 struct mos7715_parport *mos_parport = pp->private_data; 488 489 if (parport_prologue(pp) < 0) 490 return; 491 mos7715_change_mode(mos_parport, SPP); 492 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 493 parport_epilogue(pp); 494 } 495 496 static unsigned char parport_mos7715_read_data(struct parport *pp) 497 { 498 struct mos7715_parport *mos_parport = pp->private_data; 499 unsigned char d; 500 501 if (parport_prologue(pp) < 0) 502 return 0; 503 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 504 parport_epilogue(pp); 505 return d; 506 } 507 508 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 509 { 510 struct mos7715_parport *mos_parport = pp->private_data; 511 __u8 data; 512 513 if (parport_prologue(pp) < 0) 514 return; 515 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 516 write_mos_reg(mos_parport->serial, dummy, DCR, data); 517 mos_parport->shadowDCR = data; 518 parport_epilogue(pp); 519 } 520 521 static unsigned char parport_mos7715_read_control(struct parport *pp) 522 { 523 struct mos7715_parport *mos_parport = pp->private_data; 524 __u8 dcr; 525 526 spin_lock(&release_lock); 527 mos_parport = pp->private_data; 528 if (unlikely(mos_parport == NULL)) { 529 spin_unlock(&release_lock); 530 return 0; 531 } 532 dcr = mos_parport->shadowDCR & 0x0f; 533 spin_unlock(&release_lock); 534 return dcr; 535 } 536 537 static unsigned char parport_mos7715_frob_control(struct parport *pp, 538 unsigned char mask, 539 unsigned char val) 540 { 541 struct mos7715_parport *mos_parport = pp->private_data; 542 __u8 dcr; 543 544 mask &= 0x0f; 545 val &= 0x0f; 546 if (parport_prologue(pp) < 0) 547 return 0; 548 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 549 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 550 dcr = mos_parport->shadowDCR & 0x0f; 551 parport_epilogue(pp); 552 return dcr; 553 } 554 555 static unsigned char parport_mos7715_read_status(struct parport *pp) 556 { 557 unsigned char status; 558 struct mos7715_parport *mos_parport = pp->private_data; 559 560 spin_lock(&release_lock); 561 mos_parport = pp->private_data; 562 if (unlikely(mos_parport == NULL)) { /* release called */ 563 spin_unlock(&release_lock); 564 return 0; 565 } 566 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 567 spin_unlock(&release_lock); 568 return status; 569 } 570 571 static void parport_mos7715_enable_irq(struct parport *pp) 572 { 573 } 574 575 static void parport_mos7715_disable_irq(struct parport *pp) 576 { 577 } 578 579 static void parport_mos7715_data_forward(struct parport *pp) 580 { 581 struct mos7715_parport *mos_parport = pp->private_data; 582 583 if (parport_prologue(pp) < 0) 584 return; 585 mos7715_change_mode(mos_parport, PS2); 586 mos_parport->shadowDCR &= ~0x20; 587 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 588 parport_epilogue(pp); 589 } 590 591 static void parport_mos7715_data_reverse(struct parport *pp) 592 { 593 struct mos7715_parport *mos_parport = pp->private_data; 594 595 if (parport_prologue(pp) < 0) 596 return; 597 mos7715_change_mode(mos_parport, PS2); 598 mos_parport->shadowDCR |= 0x20; 599 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 600 parport_epilogue(pp); 601 } 602 603 static void parport_mos7715_init_state(struct pardevice *dev, 604 struct parport_state *s) 605 { 606 s->u.pc.ctr = DCR_INIT_VAL; 607 s->u.pc.ecr = ECR_INIT_VAL; 608 } 609 610 /* N.B. Parport core code requires that this function not block */ 611 static void parport_mos7715_save_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 s->u.pc.ctr = mos_parport->shadowDCR; 623 s->u.pc.ecr = mos_parport->shadowECR; 624 spin_unlock(&release_lock); 625 } 626 627 /* N.B. Parport core code requires that this function not block */ 628 static void parport_mos7715_restore_state(struct parport *pp, 629 struct parport_state *s) 630 { 631 struct mos7715_parport *mos_parport; 632 633 spin_lock(&release_lock); 634 mos_parport = pp->private_data; 635 if (unlikely(mos_parport == NULL)) { /* release called */ 636 spin_unlock(&release_lock); 637 return; 638 } 639 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 640 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 641 spin_unlock(&release_lock); 642 } 643 644 static size_t parport_mos7715_write_compat(struct parport *pp, 645 const void *buffer, 646 size_t len, int flags) 647 { 648 int retval; 649 struct mos7715_parport *mos_parport = pp->private_data; 650 int actual_len; 651 652 if (parport_prologue(pp) < 0) 653 return 0; 654 mos7715_change_mode(mos_parport, PPF); 655 retval = usb_bulk_msg(mos_parport->serial->dev, 656 usb_sndbulkpipe(mos_parport->serial->dev, 2), 657 (void *)buffer, len, &actual_len, 658 MOS_WDR_TIMEOUT); 659 parport_epilogue(pp); 660 if (retval) { 661 dev_err(&mos_parport->serial->dev->dev, 662 "mos7720: usb_bulk_msg() failed: %d", retval); 663 return 0; 664 } 665 return actual_len; 666 } 667 668 static struct parport_operations parport_mos7715_ops = { 669 .owner = THIS_MODULE, 670 .write_data = parport_mos7715_write_data, 671 .read_data = parport_mos7715_read_data, 672 673 .write_control = parport_mos7715_write_control, 674 .read_control = parport_mos7715_read_control, 675 .frob_control = parport_mos7715_frob_control, 676 677 .read_status = parport_mos7715_read_status, 678 679 .enable_irq = parport_mos7715_enable_irq, 680 .disable_irq = parport_mos7715_disable_irq, 681 682 .data_forward = parport_mos7715_data_forward, 683 .data_reverse = parport_mos7715_data_reverse, 684 685 .init_state = parport_mos7715_init_state, 686 .save_state = parport_mos7715_save_state, 687 .restore_state = parport_mos7715_restore_state, 688 689 .compat_write_data = parport_mos7715_write_compat, 690 691 .nibble_read_data = parport_ieee1284_read_nibble, 692 .byte_read_data = parport_ieee1284_read_byte, 693 }; 694 695 /* 696 * Allocate and initialize parallel port control struct, initialize 697 * the parallel port hardware device, and register with the parport subsystem. 698 */ 699 static int mos7715_parport_init(struct usb_serial *serial) 700 { 701 struct mos7715_parport *mos_parport; 702 703 /* allocate and initialize parallel port control struct */ 704 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 705 if (mos_parport == NULL) { 706 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__); 707 return -ENOMEM; 708 } 709 mos_parport->msg_pending = false; 710 kref_init(&mos_parport->ref_count); 711 spin_lock_init(&mos_parport->listlock); 712 INIT_LIST_HEAD(&mos_parport->active_urbs); 713 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 714 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 715 mos_parport->serial = serial; 716 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 717 (unsigned long) mos_parport); 718 init_completion(&mos_parport->syncmsg_compl); 719 720 /* cycle parallel port reset bit */ 721 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 722 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 723 724 /* initialize device registers */ 725 mos_parport->shadowDCR = DCR_INIT_VAL; 726 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 727 mos_parport->shadowECR = ECR_INIT_VAL; 728 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 729 730 /* register with parport core */ 731 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 732 PARPORT_DMA_NONE, 733 &parport_mos7715_ops); 734 if (mos_parport->pp == NULL) { 735 dev_err(&serial->interface->dev, 736 "Could not register parport\n"); 737 kref_put(&mos_parport->ref_count, destroy_mos_parport); 738 return -EIO; 739 } 740 mos_parport->pp->private_data = mos_parport; 741 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 742 mos_parport->pp->dev = &serial->interface->dev; 743 parport_announce_port(mos_parport->pp); 744 745 return 0; 746 } 747 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 748 749 /* 750 * mos7720_interrupt_callback 751 * this is the callback function for when we have received data on the 752 * interrupt endpoint. 753 */ 754 static void mos7720_interrupt_callback(struct urb *urb) 755 { 756 int result; 757 int length; 758 int status = urb->status; 759 struct device *dev = &urb->dev->dev; 760 __u8 *data; 761 __u8 sp1; 762 __u8 sp2; 763 764 switch (status) { 765 case 0: 766 /* success */ 767 break; 768 case -ECONNRESET: 769 case -ENOENT: 770 case -ESHUTDOWN: 771 /* this urb is terminated, clean up */ 772 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 773 return; 774 default: 775 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 776 goto exit; 777 } 778 779 length = urb->actual_length; 780 data = urb->transfer_buffer; 781 782 /* Moschip get 4 bytes 783 * Byte 1 IIR Port 1 (port.number is 0) 784 * Byte 2 IIR Port 2 (port.number is 1) 785 * Byte 3 -------------- 786 * Byte 4 FIFO status for both */ 787 788 /* the above description is inverted 789 * oneukum 2007-03-14 */ 790 791 if (unlikely(length != 4)) { 792 dev_dbg(dev, "Wrong data !!!\n"); 793 return; 794 } 795 796 sp1 = data[3]; 797 sp2 = data[2]; 798 799 if ((sp1 | sp2) & 0x01) { 800 /* No Interrupt Pending in both the ports */ 801 dev_dbg(dev, "No Interrupt !!!\n"); 802 } else { 803 switch (sp1 & 0x0f) { 804 case SERIAL_IIR_RLS: 805 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 806 break; 807 case SERIAL_IIR_CTI: 808 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 809 break; 810 case SERIAL_IIR_MS: 811 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 812 break; 813 } 814 815 switch (sp2 & 0x0f) { 816 case SERIAL_IIR_RLS: 817 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 818 break; 819 case SERIAL_IIR_CTI: 820 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 821 break; 822 case SERIAL_IIR_MS: 823 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 824 break; 825 } 826 } 827 828 exit: 829 result = usb_submit_urb(urb, GFP_ATOMIC); 830 if (result) 831 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 832 } 833 834 /* 835 * mos7715_interrupt_callback 836 * this is the 7715's callback function for when we have received data on 837 * the interrupt endpoint. 838 */ 839 static void mos7715_interrupt_callback(struct urb *urb) 840 { 841 int result; 842 int length; 843 int status = urb->status; 844 struct device *dev = &urb->dev->dev; 845 __u8 *data; 846 __u8 iir; 847 848 switch (status) { 849 case 0: 850 /* success */ 851 break; 852 case -ECONNRESET: 853 case -ENOENT: 854 case -ESHUTDOWN: 855 case -ENODEV: 856 /* this urb is terminated, clean up */ 857 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 858 return; 859 default: 860 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 861 goto exit; 862 } 863 864 length = urb->actual_length; 865 data = urb->transfer_buffer; 866 867 /* Structure of data from 7715 device: 868 * Byte 1: IIR serial Port 869 * Byte 2: unused 870 * Byte 2: DSR parallel port 871 * Byte 4: FIFO status for both */ 872 873 if (unlikely(length != 4)) { 874 dev_dbg(dev, "Wrong data !!!\n"); 875 return; 876 } 877 878 iir = data[0]; 879 if (!(iir & 0x01)) { /* serial port interrupt pending */ 880 switch (iir & 0x0f) { 881 case SERIAL_IIR_RLS: 882 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n"); 883 break; 884 case SERIAL_IIR_CTI: 885 dev_dbg(dev, "Serial Port: Receiver time out\n"); 886 break; 887 case SERIAL_IIR_MS: 888 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 889 break; 890 } 891 } 892 893 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 894 { /* update local copy of DSR reg */ 895 struct usb_serial_port *port = urb->context; 896 struct mos7715_parport *mos_parport = port->serial->private; 897 if (unlikely(mos_parport == NULL)) 898 return; 899 atomic_set(&mos_parport->shadowDSR, data[2]); 900 } 901 #endif 902 903 exit: 904 result = usb_submit_urb(urb, GFP_ATOMIC); 905 if (result) 906 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 907 } 908 909 /* 910 * mos7720_bulk_in_callback 911 * this is the callback function for when we have received data on the 912 * bulk in endpoint. 913 */ 914 static void mos7720_bulk_in_callback(struct urb *urb) 915 { 916 int retval; 917 unsigned char *data ; 918 struct usb_serial_port *port; 919 int status = urb->status; 920 921 if (status) { 922 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 923 return; 924 } 925 926 port = urb->context; 927 928 dev_dbg(&port->dev, "Entering...%s\n", __func__); 929 930 data = urb->transfer_buffer; 931 932 if (urb->actual_length) { 933 tty_insert_flip_string(&port->port, data, urb->actual_length); 934 tty_flip_buffer_push(&port->port); 935 } 936 937 if (port->read_urb->status != -EINPROGRESS) { 938 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 939 if (retval) 940 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 941 } 942 } 943 944 /* 945 * mos7720_bulk_out_data_callback 946 * this is the callback function for when we have finished sending serial 947 * data on the bulk out endpoint. 948 */ 949 static void mos7720_bulk_out_data_callback(struct urb *urb) 950 { 951 struct moschip_port *mos7720_port; 952 int status = urb->status; 953 954 if (status) { 955 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 956 return; 957 } 958 959 mos7720_port = urb->context; 960 if (!mos7720_port) { 961 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 962 return ; 963 } 964 965 if (mos7720_port->open) 966 tty_port_tty_wakeup(&mos7720_port->port->port); 967 } 968 969 /* 970 * mos77xx_probe 971 * this function installs the appropriate read interrupt endpoint callback 972 * depending on whether the device is a 7720 or 7715, thus avoiding costly 973 * run-time checks in the high-frequency callback routine itself. 974 */ 975 static int mos77xx_probe(struct usb_serial *serial, 976 const struct usb_device_id *id) 977 { 978 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 979 moschip7720_2port_driver.read_int_callback = 980 mos7715_interrupt_callback; 981 else 982 moschip7720_2port_driver.read_int_callback = 983 mos7720_interrupt_callback; 984 985 return 0; 986 } 987 988 static int mos77xx_calc_num_ports(struct usb_serial *serial) 989 { 990 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 991 if (product == MOSCHIP_DEVICE_ID_7715) 992 return 1; 993 994 return 2; 995 } 996 997 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 998 { 999 struct usb_serial *serial; 1000 struct urb *urb; 1001 struct moschip_port *mos7720_port; 1002 int response; 1003 int port_number; 1004 __u8 data; 1005 int allocated_urbs = 0; 1006 int j; 1007 1008 serial = port->serial; 1009 1010 mos7720_port = usb_get_serial_port_data(port); 1011 if (mos7720_port == NULL) 1012 return -ENODEV; 1013 1014 usb_clear_halt(serial->dev, port->write_urb->pipe); 1015 usb_clear_halt(serial->dev, port->read_urb->pipe); 1016 1017 /* Initialising the write urb pool */ 1018 for (j = 0; j < NUM_URBS; ++j) { 1019 urb = usb_alloc_urb(0, GFP_KERNEL); 1020 mos7720_port->write_urb_pool[j] = urb; 1021 1022 if (urb == NULL) { 1023 dev_err(&port->dev, "No more urbs???\n"); 1024 continue; 1025 } 1026 1027 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1028 GFP_KERNEL); 1029 if (!urb->transfer_buffer) { 1030 dev_err(&port->dev, 1031 "%s-out of memory for urb buffers.\n", 1032 __func__); 1033 usb_free_urb(mos7720_port->write_urb_pool[j]); 1034 mos7720_port->write_urb_pool[j] = NULL; 1035 continue; 1036 } 1037 allocated_urbs++; 1038 } 1039 1040 if (!allocated_urbs) 1041 return -ENOMEM; 1042 1043 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1044 * 1045 * Register Index 1046 * 0 : THR/RHR 1047 * 1 : IER 1048 * 2 : FCR 1049 * 3 : LCR 1050 * 4 : MCR 1051 * 5 : LSR 1052 * 6 : MSR 1053 * 7 : SPR 1054 * 1055 * 0x08 : SP1/2 Control Reg 1056 */ 1057 port_number = port->port_number; 1058 read_mos_reg(serial, port_number, LSR, &data); 1059 1060 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1061 1062 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1063 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1064 1065 write_mos_reg(serial, port_number, IER, 0x00); 1066 write_mos_reg(serial, port_number, FCR, 0x00); 1067 1068 write_mos_reg(serial, port_number, FCR, 0xcf); 1069 mos7720_port->shadowLCR = 0x03; 1070 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1071 mos7720_port->shadowMCR = 0x0b; 1072 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1073 1074 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1075 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1076 data = data | (port->port_number + 1); 1077 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1078 mos7720_port->shadowLCR = 0x83; 1079 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1080 write_mos_reg(serial, port_number, THR, 0x0c); 1081 write_mos_reg(serial, port_number, IER, 0x00); 1082 mos7720_port->shadowLCR = 0x03; 1083 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1084 write_mos_reg(serial, port_number, IER, 0x0c); 1085 1086 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1087 if (response) 1088 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1089 __func__, response); 1090 1091 /* initialize our port settings */ 1092 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1093 1094 /* send a open port command */ 1095 mos7720_port->open = 1; 1096 1097 return 0; 1098 } 1099 1100 /* 1101 * mos7720_chars_in_buffer 1102 * this function is called by the tty driver when it wants to know how many 1103 * bytes of data we currently have outstanding in the port (data that has 1104 * been written, but hasn't made it out the port yet) 1105 * If successful, we return the number of bytes left to be written in the 1106 * system, 1107 * Otherwise we return a negative error number. 1108 */ 1109 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1110 { 1111 struct usb_serial_port *port = tty->driver_data; 1112 int i; 1113 int chars = 0; 1114 struct moschip_port *mos7720_port; 1115 1116 mos7720_port = usb_get_serial_port_data(port); 1117 if (mos7720_port == NULL) 1118 return 0; 1119 1120 for (i = 0; i < NUM_URBS; ++i) { 1121 if (mos7720_port->write_urb_pool[i] && 1122 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1123 chars += URB_TRANSFER_BUFFER_SIZE; 1124 } 1125 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1126 return chars; 1127 } 1128 1129 static void mos7720_close(struct usb_serial_port *port) 1130 { 1131 struct usb_serial *serial; 1132 struct moschip_port *mos7720_port; 1133 int j; 1134 1135 serial = port->serial; 1136 1137 mos7720_port = usb_get_serial_port_data(port); 1138 if (mos7720_port == NULL) 1139 return; 1140 1141 for (j = 0; j < NUM_URBS; ++j) 1142 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1143 1144 /* Freeing Write URBs */ 1145 for (j = 0; j < NUM_URBS; ++j) { 1146 if (mos7720_port->write_urb_pool[j]) { 1147 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1148 usb_free_urb(mos7720_port->write_urb_pool[j]); 1149 } 1150 } 1151 1152 /* While closing port, shutdown all bulk read, write * 1153 * and interrupt read if they exists, otherwise nop */ 1154 usb_kill_urb(port->write_urb); 1155 usb_kill_urb(port->read_urb); 1156 1157 write_mos_reg(serial, port->port_number, MCR, 0x00); 1158 write_mos_reg(serial, port->port_number, IER, 0x00); 1159 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->port_number, LCR, mos7720_port->shadowLCR); 1183 } 1184 1185 /* 1186 * mos7720_write_room 1187 * this function is called by the tty driver when it wants to know how many 1188 * bytes of data we can accept for a specific port. 1189 * If successful, we return the amount of room that we have for this port 1190 * Otherwise we return a negative error number. 1191 */ 1192 static int mos7720_write_room(struct tty_struct *tty) 1193 { 1194 struct usb_serial_port *port = tty->driver_data; 1195 struct moschip_port *mos7720_port; 1196 int room = 0; 1197 int i; 1198 1199 mos7720_port = usb_get_serial_port_data(port); 1200 if (mos7720_port == NULL) 1201 return -ENODEV; 1202 1203 /* FIXME: Locking */ 1204 for (i = 0; i < NUM_URBS; ++i) { 1205 if (mos7720_port->write_urb_pool[i] && 1206 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1207 room += URB_TRANSFER_BUFFER_SIZE; 1208 } 1209 1210 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1211 return room; 1212 } 1213 1214 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1215 const unsigned char *data, int count) 1216 { 1217 int status; 1218 int i; 1219 int bytes_sent = 0; 1220 int transfer_size; 1221 1222 struct moschip_port *mos7720_port; 1223 struct usb_serial *serial; 1224 struct urb *urb; 1225 const unsigned char *current_position = data; 1226 1227 serial = port->serial; 1228 1229 mos7720_port = usb_get_serial_port_data(port); 1230 if (mos7720_port == NULL) 1231 return -ENODEV; 1232 1233 /* try to find a free urb in the list */ 1234 urb = NULL; 1235 1236 for (i = 0; i < NUM_URBS; ++i) { 1237 if (mos7720_port->write_urb_pool[i] && 1238 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1239 urb = mos7720_port->write_urb_pool[i]; 1240 dev_dbg(&port->dev, "URB:%d\n", i); 1241 break; 1242 } 1243 } 1244 1245 if (urb == NULL) { 1246 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1247 goto exit; 1248 } 1249 1250 if (urb->transfer_buffer == NULL) { 1251 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1252 GFP_KERNEL); 1253 if (urb->transfer_buffer == NULL) { 1254 dev_err_console(port, "%s no more kernel memory...\n", 1255 __func__); 1256 goto exit; 1257 } 1258 } 1259 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1260 1261 memcpy(urb->transfer_buffer, current_position, transfer_size); 1262 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1263 urb->transfer_buffer); 1264 1265 /* fill urb with data and submit */ 1266 usb_fill_bulk_urb(urb, serial->dev, 1267 usb_sndbulkpipe(serial->dev, 1268 port->bulk_out_endpointAddress), 1269 urb->transfer_buffer, transfer_size, 1270 mos7720_bulk_out_data_callback, mos7720_port); 1271 1272 /* send it down the pipe */ 1273 status = usb_submit_urb(urb, GFP_ATOMIC); 1274 if (status) { 1275 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1276 "with status = %d\n", __func__, status); 1277 bytes_sent = status; 1278 goto exit; 1279 } 1280 bytes_sent = transfer_size; 1281 1282 exit: 1283 return bytes_sent; 1284 } 1285 1286 static void mos7720_throttle(struct tty_struct *tty) 1287 { 1288 struct usb_serial_port *port = tty->driver_data; 1289 struct moschip_port *mos7720_port; 1290 int status; 1291 1292 mos7720_port = usb_get_serial_port_data(port); 1293 1294 if (mos7720_port == NULL) 1295 return; 1296 1297 if (!mos7720_port->open) { 1298 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1299 return; 1300 } 1301 1302 /* if we are implementing XON/XOFF, send the stop character */ 1303 if (I_IXOFF(tty)) { 1304 unsigned char stop_char = STOP_CHAR(tty); 1305 status = mos7720_write(tty, port, &stop_char, 1); 1306 if (status <= 0) 1307 return; 1308 } 1309 1310 /* if we are implementing RTS/CTS, toggle that line */ 1311 if (tty->termios.c_cflag & CRTSCTS) { 1312 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1313 write_mos_reg(port->serial, port->port_number, MCR, 1314 mos7720_port->shadowMCR); 1315 if (status != 0) 1316 return; 1317 } 1318 } 1319 1320 static void mos7720_unthrottle(struct tty_struct *tty) 1321 { 1322 struct usb_serial_port *port = tty->driver_data; 1323 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1324 int status; 1325 1326 if (mos7720_port == NULL) 1327 return; 1328 1329 if (!mos7720_port->open) { 1330 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1331 return; 1332 } 1333 1334 /* if we are implementing XON/XOFF, send the start character */ 1335 if (I_IXOFF(tty)) { 1336 unsigned char start_char = START_CHAR(tty); 1337 status = mos7720_write(tty, port, &start_char, 1); 1338 if (status <= 0) 1339 return; 1340 } 1341 1342 /* if we are implementing RTS/CTS, toggle that line */ 1343 if (tty->termios.c_cflag & CRTSCTS) { 1344 mos7720_port->shadowMCR |= UART_MCR_RTS; 1345 write_mos_reg(port->serial, port->port_number, MCR, 1346 mos7720_port->shadowMCR); 1347 if (status != 0) 1348 return; 1349 } 1350 } 1351 1352 /* FIXME: this function does not work */ 1353 static int set_higher_rates(struct moschip_port *mos7720_port, 1354 unsigned int baud) 1355 { 1356 struct usb_serial_port *port; 1357 struct usb_serial *serial; 1358 int port_number; 1359 enum mos_regs sp_reg; 1360 if (mos7720_port == NULL) 1361 return -EINVAL; 1362 1363 port = mos7720_port->port; 1364 serial = port->serial; 1365 1366 /*********************************************** 1367 * Init Sequence for higher rates 1368 ***********************************************/ 1369 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1370 port_number = port->port_number; 1371 1372 write_mos_reg(serial, port_number, IER, 0x00); 1373 write_mos_reg(serial, port_number, FCR, 0x00); 1374 write_mos_reg(serial, port_number, FCR, 0xcf); 1375 mos7720_port->shadowMCR = 0x0b; 1376 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1377 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1378 1379 /*********************************************** 1380 * Set for higher rates * 1381 ***********************************************/ 1382 /* writing baud rate verbatum into uart clock field clearly not right */ 1383 if (port_number == 0) 1384 sp_reg = SP1_REG; 1385 else 1386 sp_reg = SP2_REG; 1387 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1388 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1389 mos7720_port->shadowMCR = 0x2b; 1390 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1391 1392 /*********************************************** 1393 * Set DLL/DLM 1394 ***********************************************/ 1395 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1396 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1397 write_mos_reg(serial, port_number, DLL, 0x01); 1398 write_mos_reg(serial, port_number, DLM, 0x00); 1399 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1400 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1401 1402 return 0; 1403 } 1404 1405 /* baud rate information */ 1406 struct divisor_table_entry { 1407 __u32 baudrate; 1408 __u16 divisor; 1409 }; 1410 1411 /* Define table of divisors for moschip 7720 hardware * 1412 * These assume a 3.6864MHz crystal, the standard /16, and * 1413 * MCR.7 = 0. */ 1414 static struct divisor_table_entry divisor_table[] = { 1415 { 50, 2304}, 1416 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1417 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1418 { 150, 768}, 1419 { 300, 384}, 1420 { 600, 192}, 1421 { 1200, 96}, 1422 { 1800, 64}, 1423 { 2400, 48}, 1424 { 4800, 24}, 1425 { 7200, 16}, 1426 { 9600, 12}, 1427 { 19200, 6}, 1428 { 38400, 3}, 1429 { 57600, 2}, 1430 { 115200, 1}, 1431 }; 1432 1433 /***************************************************************************** 1434 * calc_baud_rate_divisor 1435 * this function calculates the proper baud rate divisor for the specified 1436 * baud rate. 1437 *****************************************************************************/ 1438 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1439 { 1440 int i; 1441 __u16 custom; 1442 __u16 round1; 1443 __u16 round; 1444 1445 1446 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1447 1448 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1449 if (divisor_table[i].baudrate == baudrate) { 1450 *divisor = divisor_table[i].divisor; 1451 return 0; 1452 } 1453 } 1454 1455 /* After trying for all the standard baud rates * 1456 * Try calculating the divisor for this baud rate */ 1457 if (baudrate > 75 && baudrate < 230400) { 1458 /* get the divisor */ 1459 custom = (__u16)(230400L / baudrate); 1460 1461 /* Check for round off */ 1462 round1 = (__u16)(2304000L / baudrate); 1463 round = (__u16)(round1 - (custom * 10)); 1464 if (round > 4) 1465 custom++; 1466 *divisor = custom; 1467 1468 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1469 return 0; 1470 } 1471 1472 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1473 return -EINVAL; 1474 } 1475 1476 /* 1477 * send_cmd_write_baud_rate 1478 * this function sends the proper command to change the baud rate of the 1479 * specified port. 1480 */ 1481 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1482 int baudrate) 1483 { 1484 struct usb_serial_port *port; 1485 struct usb_serial *serial; 1486 int divisor; 1487 int status; 1488 unsigned char number; 1489 1490 if (mos7720_port == NULL) 1491 return -1; 1492 1493 port = mos7720_port->port; 1494 serial = port->serial; 1495 1496 number = port->port_number; 1497 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1498 1499 /* Calculate the Divisor */ 1500 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1501 if (status) { 1502 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1503 return status; 1504 } 1505 1506 /* Enable access to divisor latch */ 1507 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1508 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1509 1510 /* Write the divisor */ 1511 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1512 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1513 1514 /* Disable access to divisor latch */ 1515 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1516 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1517 1518 return status; 1519 } 1520 1521 /* 1522 * change_port_settings 1523 * This routine is called to set the UART on the device to match 1524 * the specified new settings. 1525 */ 1526 static void change_port_settings(struct tty_struct *tty, 1527 struct moschip_port *mos7720_port, 1528 struct ktermios *old_termios) 1529 { 1530 struct usb_serial_port *port; 1531 struct usb_serial *serial; 1532 int baud; 1533 unsigned cflag; 1534 unsigned iflag; 1535 __u8 mask = 0xff; 1536 __u8 lData; 1537 __u8 lParity; 1538 __u8 lStop; 1539 int status; 1540 int port_number; 1541 1542 if (mos7720_port == NULL) 1543 return ; 1544 1545 port = mos7720_port->port; 1546 serial = port->serial; 1547 port_number = port->port_number; 1548 1549 if (!mos7720_port->open) { 1550 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1551 return; 1552 } 1553 1554 lData = UART_LCR_WLEN8; 1555 lStop = 0x00; /* 1 stop bit */ 1556 lParity = 0x00; /* No parity */ 1557 1558 cflag = tty->termios.c_cflag; 1559 iflag = tty->termios.c_iflag; 1560 1561 /* Change the number of bits */ 1562 switch (cflag & CSIZE) { 1563 case CS5: 1564 lData = UART_LCR_WLEN5; 1565 mask = 0x1f; 1566 break; 1567 1568 case CS6: 1569 lData = UART_LCR_WLEN6; 1570 mask = 0x3f; 1571 break; 1572 1573 case CS7: 1574 lData = UART_LCR_WLEN7; 1575 mask = 0x7f; 1576 break; 1577 default: 1578 case CS8: 1579 lData = UART_LCR_WLEN8; 1580 break; 1581 } 1582 1583 /* Change the Parity bit */ 1584 if (cflag & PARENB) { 1585 if (cflag & PARODD) { 1586 lParity = UART_LCR_PARITY; 1587 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1588 } else { 1589 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1590 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1591 } 1592 1593 } else { 1594 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1595 } 1596 1597 if (cflag & CMSPAR) 1598 lParity = lParity | 0x20; 1599 1600 /* Change the Stop bit */ 1601 if (cflag & CSTOPB) { 1602 lStop = UART_LCR_STOP; 1603 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1604 } else { 1605 lStop = 0x00; 1606 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1607 } 1608 1609 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1610 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1611 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1612 1613 /* Update the LCR with the correct value */ 1614 mos7720_port->shadowLCR &= 1615 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1616 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1617 1618 1619 /* Disable Interrupts */ 1620 write_mos_reg(serial, port_number, IER, 0x00); 1621 write_mos_reg(serial, port_number, FCR, 0x00); 1622 write_mos_reg(serial, port_number, FCR, 0xcf); 1623 1624 /* Send the updated LCR value to the mos7720 */ 1625 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1626 mos7720_port->shadowMCR = 0x0b; 1627 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1628 1629 /* set up the MCR register and send it to the mos7720 */ 1630 mos7720_port->shadowMCR = UART_MCR_OUT2; 1631 if (cflag & CBAUD) 1632 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1633 1634 if (cflag & CRTSCTS) { 1635 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1636 /* To set hardware flow control to the specified * 1637 * serial port, in SP1/2_CONTROL_REG */ 1638 if (port_number) 1639 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1640 else 1641 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1642 1643 } else 1644 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1645 1646 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1647 1648 /* Determine divisor based on baud rate */ 1649 baud = tty_get_baud_rate(tty); 1650 if (!baud) { 1651 /* pick a default, any default... */ 1652 dev_dbg(&port->dev, "Picked default baud...\n"); 1653 baud = 9600; 1654 } 1655 1656 if (baud >= 230400) { 1657 set_higher_rates(mos7720_port, baud); 1658 /* Enable Interrupts */ 1659 write_mos_reg(serial, port_number, IER, 0x0c); 1660 return; 1661 } 1662 1663 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1664 status = send_cmd_write_baud_rate(mos7720_port, baud); 1665 /* FIXME: needs to write actual resulting baud back not just 1666 blindly do so */ 1667 if (cflag & CBAUD) 1668 tty_encode_baud_rate(tty, baud, baud); 1669 /* Enable Interrupts */ 1670 write_mos_reg(serial, port_number, IER, 0x0c); 1671 1672 if (port->read_urb->status != -EINPROGRESS) { 1673 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1674 if (status) 1675 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1676 } 1677 } 1678 1679 /* 1680 * mos7720_set_termios 1681 * this function is called by the tty driver when it wants to change the 1682 * termios structure. 1683 */ 1684 static void mos7720_set_termios(struct tty_struct *tty, 1685 struct usb_serial_port *port, struct ktermios *old_termios) 1686 { 1687 int status; 1688 unsigned int cflag; 1689 struct usb_serial *serial; 1690 struct moschip_port *mos7720_port; 1691 1692 serial = port->serial; 1693 1694 mos7720_port = usb_get_serial_port_data(port); 1695 1696 if (mos7720_port == NULL) 1697 return; 1698 1699 if (!mos7720_port->open) { 1700 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1701 return; 1702 } 1703 1704 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1705 1706 cflag = tty->termios.c_cflag; 1707 1708 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1709 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1710 1711 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1712 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1713 1714 /* change the port settings to the new ones specified */ 1715 change_port_settings(tty, mos7720_port, old_termios); 1716 1717 if (port->read_urb->status != -EINPROGRESS) { 1718 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1719 if (status) 1720 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1721 } 1722 } 1723 1724 /* 1725 * get_lsr_info - get line status register info 1726 * 1727 * Purpose: Let user call ioctl() to get info when the UART physically 1728 * is emptied. On bus types like RS485, the transmitter must 1729 * release the bus after transmitting. This must be done when 1730 * the transmit shift register is empty, not be done when the 1731 * transmit holding register is empty. This functionality 1732 * allows an RS485 driver to be written in user space. 1733 */ 1734 static int get_lsr_info(struct tty_struct *tty, 1735 struct moschip_port *mos7720_port, unsigned int __user *value) 1736 { 1737 struct usb_serial_port *port = tty->driver_data; 1738 unsigned int result = 0; 1739 unsigned char data = 0; 1740 int port_number = port->port_number; 1741 int count; 1742 1743 count = mos7720_chars_in_buffer(tty); 1744 if (count == 0) { 1745 read_mos_reg(port->serial, port_number, LSR, &data); 1746 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1747 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1748 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1749 result = TIOCSER_TEMT; 1750 } 1751 } 1752 if (copy_to_user(value, &result, sizeof(int))) 1753 return -EFAULT; 1754 return 0; 1755 } 1756 1757 static int mos7720_tiocmget(struct tty_struct *tty) 1758 { 1759 struct usb_serial_port *port = tty->driver_data; 1760 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1761 unsigned int result = 0; 1762 unsigned int mcr ; 1763 unsigned int msr ; 1764 1765 mcr = mos7720_port->shadowMCR; 1766 msr = mos7720_port->shadowMSR; 1767 1768 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1769 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1770 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1771 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1772 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1773 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1774 1775 return result; 1776 } 1777 1778 static int mos7720_tiocmset(struct tty_struct *tty, 1779 unsigned int set, unsigned int clear) 1780 { 1781 struct usb_serial_port *port = tty->driver_data; 1782 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1783 unsigned int mcr ; 1784 1785 mcr = mos7720_port->shadowMCR; 1786 1787 if (set & TIOCM_RTS) 1788 mcr |= UART_MCR_RTS; 1789 if (set & TIOCM_DTR) 1790 mcr |= UART_MCR_DTR; 1791 if (set & TIOCM_LOOP) 1792 mcr |= UART_MCR_LOOP; 1793 1794 if (clear & TIOCM_RTS) 1795 mcr &= ~UART_MCR_RTS; 1796 if (clear & TIOCM_DTR) 1797 mcr &= ~UART_MCR_DTR; 1798 if (clear & TIOCM_LOOP) 1799 mcr &= ~UART_MCR_LOOP; 1800 1801 mos7720_port->shadowMCR = mcr; 1802 write_mos_reg(port->serial, port->port_number, MCR, 1803 mos7720_port->shadowMCR); 1804 1805 return 0; 1806 } 1807 1808 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1809 unsigned int __user *value) 1810 { 1811 unsigned int mcr; 1812 unsigned int arg; 1813 1814 struct usb_serial_port *port; 1815 1816 if (mos7720_port == NULL) 1817 return -1; 1818 1819 port = (struct usb_serial_port *)mos7720_port->port; 1820 mcr = mos7720_port->shadowMCR; 1821 1822 if (copy_from_user(&arg, value, sizeof(int))) 1823 return -EFAULT; 1824 1825 switch (cmd) { 1826 case TIOCMBIS: 1827 if (arg & TIOCM_RTS) 1828 mcr |= UART_MCR_RTS; 1829 if (arg & TIOCM_DTR) 1830 mcr |= UART_MCR_RTS; 1831 if (arg & TIOCM_LOOP) 1832 mcr |= UART_MCR_LOOP; 1833 break; 1834 1835 case TIOCMBIC: 1836 if (arg & TIOCM_RTS) 1837 mcr &= ~UART_MCR_RTS; 1838 if (arg & TIOCM_DTR) 1839 mcr &= ~UART_MCR_RTS; 1840 if (arg & TIOCM_LOOP) 1841 mcr &= ~UART_MCR_LOOP; 1842 break; 1843 1844 } 1845 1846 mos7720_port->shadowMCR = mcr; 1847 write_mos_reg(port->serial, port->port_number, MCR, 1848 mos7720_port->shadowMCR); 1849 1850 return 0; 1851 } 1852 1853 static int get_serial_info(struct moschip_port *mos7720_port, 1854 struct serial_struct __user *retinfo) 1855 { 1856 struct serial_struct tmp; 1857 1858 if (!retinfo) 1859 return -EFAULT; 1860 1861 memset(&tmp, 0, sizeof(tmp)); 1862 1863 tmp.type = PORT_16550A; 1864 tmp.line = mos7720_port->port->minor; 1865 tmp.port = mos7720_port->port->port_number; 1866 tmp.irq = 0; 1867 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1868 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1869 tmp.baud_base = 9600; 1870 tmp.close_delay = 5*HZ; 1871 tmp.closing_wait = 30*HZ; 1872 1873 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1874 return -EFAULT; 1875 return 0; 1876 } 1877 1878 static int mos7720_ioctl(struct tty_struct *tty, 1879 unsigned int cmd, unsigned long arg) 1880 { 1881 struct usb_serial_port *port = tty->driver_data; 1882 struct moschip_port *mos7720_port; 1883 1884 mos7720_port = usb_get_serial_port_data(port); 1885 if (mos7720_port == NULL) 1886 return -ENODEV; 1887 1888 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd); 1889 1890 switch (cmd) { 1891 case TIOCSERGETLSR: 1892 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1893 return get_lsr_info(tty, mos7720_port, 1894 (unsigned int __user *)arg); 1895 1896 /* FIXME: These should be using the mode methods */ 1897 case TIOCMBIS: 1898 case TIOCMBIC: 1899 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1900 return set_modem_info(mos7720_port, cmd, 1901 (unsigned int __user *)arg); 1902 1903 case TIOCGSERIAL: 1904 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1905 return get_serial_info(mos7720_port, 1906 (struct serial_struct __user *)arg); 1907 } 1908 1909 return -ENOIOCTLCMD; 1910 } 1911 1912 static int mos7720_startup(struct usb_serial *serial) 1913 { 1914 struct usb_device *dev; 1915 char data; 1916 u16 product; 1917 int ret_val; 1918 1919 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1920 dev = serial->dev; 1921 1922 /* 1923 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1924 * port, and the second for the serial port. Because the usbserial core 1925 * assumes both pairs are serial ports, we must engage in a bit of 1926 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1927 * port 0 point to the serial port. However, both moschip devices use a 1928 * single interrupt-in endpoint for both ports (as mentioned a little 1929 * further down), and this endpoint was assigned to port 0. So after 1930 * the swap, we must copy the interrupt endpoint elements from port 1 1931 * (as newly assigned) to port 0, and null out port 1 pointers. 1932 */ 1933 if (product == MOSCHIP_DEVICE_ID_7715) { 1934 struct usb_serial_port *tmp = serial->port[0]; 1935 serial->port[0] = serial->port[1]; 1936 serial->port[1] = tmp; 1937 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1938 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1939 serial->port[0]->interrupt_in_endpointAddress = 1940 tmp->interrupt_in_endpointAddress; 1941 serial->port[1]->interrupt_in_urb = NULL; 1942 serial->port[1]->interrupt_in_buffer = NULL; 1943 } 1944 1945 /* setting configuration feature to one */ 1946 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1947 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1948 1949 /* start the interrupt urb */ 1950 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1951 if (ret_val) 1952 dev_err(&dev->dev, 1953 "%s - Error %d submitting control urb\n", 1954 __func__, ret_val); 1955 1956 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1957 if (product == MOSCHIP_DEVICE_ID_7715) { 1958 ret_val = mos7715_parport_init(serial); 1959 if (ret_val < 0) 1960 return ret_val; 1961 } 1962 #endif 1963 /* LSR For Port 1 */ 1964 read_mos_reg(serial, 0, LSR, &data); 1965 dev_dbg(&dev->dev, "LSR:%x\n", data); 1966 1967 return 0; 1968 } 1969 1970 static void mos7720_release(struct usb_serial *serial) 1971 { 1972 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1973 /* close the parallel port */ 1974 1975 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1976 == MOSCHIP_DEVICE_ID_7715) { 1977 struct urbtracker *urbtrack; 1978 unsigned long flags; 1979 struct mos7715_parport *mos_parport = 1980 usb_get_serial_data(serial); 1981 1982 /* prevent NULL ptr dereference in port callbacks */ 1983 spin_lock(&release_lock); 1984 mos_parport->pp->private_data = NULL; 1985 spin_unlock(&release_lock); 1986 1987 /* wait for synchronous usb calls to return */ 1988 if (mos_parport->msg_pending) 1989 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1990 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1991 1992 parport_remove_port(mos_parport->pp); 1993 usb_set_serial_data(serial, NULL); 1994 mos_parport->serial = NULL; 1995 1996 /* if tasklet currently scheduled, wait for it to complete */ 1997 tasklet_kill(&mos_parport->urb_tasklet); 1998 1999 /* unlink any urbs sent by the tasklet */ 2000 spin_lock_irqsave(&mos_parport->listlock, flags); 2001 list_for_each_entry(urbtrack, 2002 &mos_parport->active_urbs, 2003 urblist_entry) 2004 usb_unlink_urb(urbtrack->urb); 2005 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2006 2007 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2008 } 2009 #endif 2010 } 2011 2012 static int mos7720_port_probe(struct usb_serial_port *port) 2013 { 2014 struct moschip_port *mos7720_port; 2015 2016 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2017 if (!mos7720_port) 2018 return -ENOMEM; 2019 2020 /* Initialize all port interrupt end point to port 0 int endpoint. 2021 * Our device has only one interrupt endpoint common to all ports. 2022 */ 2023 port->interrupt_in_endpointAddress = 2024 port->serial->port[0]->interrupt_in_endpointAddress; 2025 mos7720_port->port = port; 2026 2027 usb_set_serial_port_data(port, mos7720_port); 2028 2029 return 0; 2030 } 2031 2032 static int mos7720_port_remove(struct usb_serial_port *port) 2033 { 2034 struct moschip_port *mos7720_port; 2035 2036 mos7720_port = usb_get_serial_port_data(port); 2037 kfree(mos7720_port); 2038 2039 return 0; 2040 } 2041 2042 static struct usb_serial_driver moschip7720_2port_driver = { 2043 .driver = { 2044 .owner = THIS_MODULE, 2045 .name = "moschip7720", 2046 }, 2047 .description = "Moschip 2 port adapter", 2048 .id_table = id_table, 2049 .calc_num_ports = mos77xx_calc_num_ports, 2050 .open = mos7720_open, 2051 .close = mos7720_close, 2052 .throttle = mos7720_throttle, 2053 .unthrottle = mos7720_unthrottle, 2054 .probe = mos77xx_probe, 2055 .attach = mos7720_startup, 2056 .release = mos7720_release, 2057 .port_probe = mos7720_port_probe, 2058 .port_remove = mos7720_port_remove, 2059 .ioctl = mos7720_ioctl, 2060 .tiocmget = mos7720_tiocmget, 2061 .tiocmset = mos7720_tiocmset, 2062 .set_termios = mos7720_set_termios, 2063 .write = mos7720_write, 2064 .write_room = mos7720_write_room, 2065 .chars_in_buffer = mos7720_chars_in_buffer, 2066 .break_ctl = mos7720_break, 2067 .read_bulk_callback = mos7720_bulk_in_callback, 2068 .read_int_callback = NULL /* dynamically assigned in probe() */ 2069 }; 2070 2071 static struct usb_serial_driver * const serial_drivers[] = { 2072 &moschip7720_2port_driver, NULL 2073 }; 2074 2075 module_usb_serial_driver(serial_drivers, id_table); 2076 2077 MODULE_AUTHOR(DRIVER_AUTHOR); 2078 MODULE_DESCRIPTION(DRIVER_DESC); 2079 MODULE_LICENSE("GPL"); 2080