1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mos7720.c 4 * Controls the Moschip 7720 usb to dual port serial converter 5 * 6 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 7 * 8 * Developed by: 9 * Vijaya Kumar <vijaykumar.gn@gmail.com> 10 * Ajay Kumar <naanuajay@yahoo.com> 11 * Gurudeva <ngurudeva@yahoo.com> 12 * 13 * Cleaned up from the original by: 14 * Greg Kroah-Hartman <gregkh@suse.de> 15 * 16 * Originally based on drivers/usb/serial/io_edgeport.c which is: 17 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 18 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 19 */ 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/slab.h> 23 #include <linux/tty.h> 24 #include <linux/tty_driver.h> 25 #include <linux/tty_flip.h> 26 #include <linux/module.h> 27 #include <linux/spinlock.h> 28 #include <linux/serial.h> 29 #include <linux/serial_reg.h> 30 #include <linux/usb.h> 31 #include <linux/usb/serial.h> 32 #include <linux/uaccess.h> 33 #include <linux/parport.h> 34 35 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 36 #define DRIVER_DESC "Moschip USB Serial Driver" 37 38 /* default urb timeout */ 39 #define MOS_WDR_TIMEOUT 5000 40 41 #define MOS_MAX_PORT 0x02 42 #define MOS_WRITE 0x0E 43 #define MOS_READ 0x0D 44 45 /* Interrupt Routines Defines */ 46 #define SERIAL_IIR_RLS 0x06 47 #define SERIAL_IIR_RDA 0x04 48 #define SERIAL_IIR_CTI 0x0c 49 #define SERIAL_IIR_THR 0x02 50 #define SERIAL_IIR_MS 0x00 51 52 #define NUM_URBS 16 /* URB Count */ 53 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 54 55 /* This structure holds all of the local serial port information */ 56 struct moschip_port { 57 __u8 shadowLCR; /* last LCR value received */ 58 __u8 shadowMCR; /* last MCR value received */ 59 __u8 shadowMSR; /* last MSR value received */ 60 char open; 61 struct usb_serial_port *port; /* loop back to the owner */ 62 struct urb *write_urb_pool[NUM_URBS]; 63 }; 64 65 #define USB_VENDOR_ID_MOSCHIP 0x9710 66 #define MOSCHIP_DEVICE_ID_7720 0x7720 67 #define MOSCHIP_DEVICE_ID_7715 0x7715 68 69 static const struct usb_device_id id_table[] = { 70 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 71 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 72 { } /* terminating entry */ 73 }; 74 MODULE_DEVICE_TABLE(usb, id_table); 75 76 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 77 78 /* initial values for parport regs */ 79 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 80 #define ECR_INIT_VAL 0x00 /* SPP mode */ 81 82 struct urbtracker { 83 struct mos7715_parport *mos_parport; 84 struct list_head urblist_entry; 85 struct kref ref_count; 86 struct urb *urb; 87 struct usb_ctrlrequest *setup; 88 }; 89 90 enum mos7715_pp_modes { 91 SPP = 0<<5, 92 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 93 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 94 }; 95 96 struct mos7715_parport { 97 struct parport *pp; /* back to containing struct */ 98 struct kref ref_count; /* to instance of this struct */ 99 struct list_head deferred_urbs; /* list deferred async urbs */ 100 struct list_head active_urbs; /* list async urbs in flight */ 101 spinlock_t listlock; /* protects list access */ 102 bool msg_pending; /* usb sync call pending */ 103 struct completion syncmsg_compl; /* usb sync call completed */ 104 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 105 struct usb_serial *serial; /* back to containing struct */ 106 __u8 shadowECR; /* parallel port regs... */ 107 __u8 shadowDCR; 108 atomic_t shadowDSR; /* updated in int-in callback */ 109 }; 110 111 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 112 static DEFINE_SPINLOCK(release_lock); 113 114 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 115 116 static const unsigned int dummy; /* for clarity in register access fns */ 117 118 enum mos_regs { 119 MOS7720_THR, /* serial port regs */ 120 MOS7720_RHR, 121 MOS7720_IER, 122 MOS7720_FCR, 123 MOS7720_ISR, 124 MOS7720_LCR, 125 MOS7720_MCR, 126 MOS7720_LSR, 127 MOS7720_MSR, 128 MOS7720_SPR, 129 MOS7720_DLL, 130 MOS7720_DLM, 131 MOS7720_DPR, /* parallel port regs */ 132 MOS7720_DSR, 133 MOS7720_DCR, 134 MOS7720_ECR, 135 MOS7720_SP1_REG, /* device control regs */ 136 MOS7720_SP2_REG, /* serial port 2 (7720 only) */ 137 MOS7720_PP_REG, 138 MOS7720_SP_CONTROL_REG, 139 }; 140 141 /* 142 * Return the correct value for the Windex field of the setup packet 143 * for a control endpoint message. See the 7715 datasheet. 144 */ 145 static inline __u16 get_reg_index(enum mos_regs reg) 146 { 147 static const __u16 mos7715_index_lookup_table[] = { 148 0x00, /* MOS7720_THR */ 149 0x00, /* MOS7720_RHR */ 150 0x01, /* MOS7720_IER */ 151 0x02, /* MOS7720_FCR */ 152 0x02, /* MOS7720_ISR */ 153 0x03, /* MOS7720_LCR */ 154 0x04, /* MOS7720_MCR */ 155 0x05, /* MOS7720_LSR */ 156 0x06, /* MOS7720_MSR */ 157 0x07, /* MOS7720_SPR */ 158 0x00, /* MOS7720_DLL */ 159 0x01, /* MOS7720_DLM */ 160 0x00, /* MOS7720_DPR */ 161 0x01, /* MOS7720_DSR */ 162 0x02, /* MOS7720_DCR */ 163 0x0a, /* MOS7720_ECR */ 164 0x01, /* MOS7720_SP1_REG */ 165 0x02, /* MOS7720_SP2_REG (7720 only) */ 166 0x04, /* MOS7720_PP_REG (7715 only) */ 167 0x08, /* MOS7720_SP_CONTROL_REG */ 168 }; 169 return mos7715_index_lookup_table[reg]; 170 } 171 172 /* 173 * Return the correct value for the upper byte of the Wvalue field of 174 * the setup packet for a control endpoint message. 175 */ 176 static inline __u16 get_reg_value(enum mos_regs reg, 177 unsigned int serial_portnum) 178 { 179 if (reg >= MOS7720_SP1_REG) /* control reg */ 180 return 0x0000; 181 182 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */ 183 return 0x0100; 184 185 else /* serial port reg */ 186 return (serial_portnum + 2) << 8; 187 } 188 189 /* 190 * Write data byte to the specified device register. The data is embedded in 191 * the value field of the setup packet. serial_portnum is ignored for registers 192 * not specific to a particular serial port. 193 */ 194 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 195 enum mos_regs reg, __u8 data) 196 { 197 struct usb_device *usbdev = serial->dev; 198 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 199 __u8 request = (__u8)0x0e; 200 __u8 requesttype = (__u8)0x40; 201 __u16 index = get_reg_index(reg); 202 __u16 value = get_reg_value(reg, serial_portnum) + data; 203 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 204 index, NULL, 0, MOS_WDR_TIMEOUT); 205 if (status < 0) 206 dev_err(&usbdev->dev, 207 "mos7720: usb_control_msg() failed: %d\n", status); 208 return status; 209 } 210 211 /* 212 * Read data byte from the specified device register. The data returned by the 213 * device is embedded in the value field of the setup packet. serial_portnum is 214 * ignored for registers that are not specific to a particular serial port. 215 */ 216 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 217 enum mos_regs reg, __u8 *data) 218 { 219 struct usb_device *usbdev = serial->dev; 220 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 221 __u8 request = (__u8)0x0d; 222 __u8 requesttype = (__u8)0xc0; 223 __u16 index = get_reg_index(reg); 224 __u16 value = get_reg_value(reg, serial_portnum); 225 u8 *buf; 226 int status; 227 228 buf = kmalloc(1, GFP_KERNEL); 229 if (!buf) 230 return -ENOMEM; 231 232 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 233 index, buf, 1, MOS_WDR_TIMEOUT); 234 if (status == 1) { 235 *data = *buf; 236 } else { 237 dev_err(&usbdev->dev, 238 "mos7720: usb_control_msg() failed: %d\n", status); 239 if (status >= 0) 240 status = -EIO; 241 *data = 0; 242 } 243 244 kfree(buf); 245 246 return status; 247 } 248 249 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 250 251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 252 enum mos7715_pp_modes mode) 253 { 254 mos_parport->shadowECR = mode; 255 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 256 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) 366 return -ENOMEM; 367 368 kref_get(&mos_parport->ref_count); 369 urbtrack->mos_parport = mos_parport; 370 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 371 if (!urbtrack->urb) { 372 kfree(urbtrack); 373 return -ENOMEM; 374 } 375 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC); 376 if (!urbtrack->setup) { 377 usb_free_urb(urbtrack->urb); 378 kfree(urbtrack); 379 return -ENOMEM; 380 } 381 urbtrack->setup->bRequestType = (__u8)0x40; 382 urbtrack->setup->bRequest = (__u8)0x0e; 383 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy)); 384 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg)); 385 urbtrack->setup->wLength = 0; 386 usb_fill_control_urb(urbtrack->urb, usbdev, 387 usb_sndctrlpipe(usbdev, 0), 388 (unsigned char *)urbtrack->setup, 389 NULL, 0, async_complete, urbtrack); 390 kref_init(&urbtrack->ref_count); 391 INIT_LIST_HEAD(&urbtrack->urblist_entry); 392 393 /* 394 * get the disconnect mutex, or add tracker to the deferred_urbs list 395 * and schedule a tasklet to try again later 396 */ 397 if (!mutex_trylock(&serial->disc_mutex)) { 398 spin_lock_irqsave(&mos_parport->listlock, flags); 399 list_add_tail(&urbtrack->urblist_entry, 400 &mos_parport->deferred_urbs); 401 spin_unlock_irqrestore(&mos_parport->listlock, flags); 402 tasklet_schedule(&mos_parport->urb_tasklet); 403 dev_dbg(&usbdev->dev, "tasklet scheduled\n"); 404 return 0; 405 } 406 407 /* bail if device disconnected */ 408 if (serial->disconnected) { 409 kref_put(&urbtrack->ref_count, destroy_urbtracker); 410 mutex_unlock(&serial->disc_mutex); 411 return -ENODEV; 412 } 413 414 /* add the tracker to the active_urbs list and submit */ 415 spin_lock_irqsave(&mos_parport->listlock, flags); 416 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 417 spin_unlock_irqrestore(&mos_parport->listlock, flags); 418 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 419 mutex_unlock(&serial->disc_mutex); 420 if (ret_val) { 421 dev_err(&usbdev->dev, 422 "%s: submit_urb() failed: %d\n", __func__, ret_val); 423 spin_lock_irqsave(&mos_parport->listlock, flags); 424 list_del(&urbtrack->urblist_entry); 425 spin_unlock_irqrestore(&mos_parport->listlock, flags); 426 kref_put(&urbtrack->ref_count, destroy_urbtracker); 427 return ret_val; 428 } 429 return 0; 430 } 431 432 /* 433 * This is the the common top part of all parallel port callback operations that 434 * send synchronous messages to the device. This implements convoluted locking 435 * that avoids two scenarios: (1) a port operation is called after usbserial 436 * has called our release function, at which point struct mos7715_parport has 437 * been destroyed, and (2) the device has been disconnected, but usbserial has 438 * not called the release function yet because someone has a serial port open. 439 * The shared release_lock prevents the first, and the mutex and disconnected 440 * flag maintained by usbserial covers the second. We also use the msg_pending 441 * flag to ensure that all synchronous usb message calls have completed before 442 * our release function can return. 443 */ 444 static int parport_prologue(struct parport *pp) 445 { 446 struct mos7715_parport *mos_parport; 447 448 spin_lock(&release_lock); 449 mos_parport = pp->private_data; 450 if (unlikely(mos_parport == NULL)) { 451 /* release fn called, port struct destroyed */ 452 spin_unlock(&release_lock); 453 return -1; 454 } 455 mos_parport->msg_pending = true; /* synch usb call pending */ 456 reinit_completion(&mos_parport->syncmsg_compl); 457 spin_unlock(&release_lock); 458 459 mutex_lock(&mos_parport->serial->disc_mutex); 460 if (mos_parport->serial->disconnected) { 461 /* device disconnected */ 462 mutex_unlock(&mos_parport->serial->disc_mutex); 463 mos_parport->msg_pending = false; 464 complete(&mos_parport->syncmsg_compl); 465 return -1; 466 } 467 468 return 0; 469 } 470 471 /* 472 * This is the common bottom part of all parallel port functions that send 473 * synchronous messages to the device. 474 */ 475 static inline void parport_epilogue(struct parport *pp) 476 { 477 struct mos7715_parport *mos_parport = pp->private_data; 478 mutex_unlock(&mos_parport->serial->disc_mutex); 479 mos_parport->msg_pending = false; 480 complete(&mos_parport->syncmsg_compl); 481 } 482 483 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 484 { 485 struct mos7715_parport *mos_parport = pp->private_data; 486 487 if (parport_prologue(pp) < 0) 488 return; 489 mos7715_change_mode(mos_parport, SPP); 490 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d); 491 parport_epilogue(pp); 492 } 493 494 static unsigned char parport_mos7715_read_data(struct parport *pp) 495 { 496 struct mos7715_parport *mos_parport = pp->private_data; 497 unsigned char d; 498 499 if (parport_prologue(pp) < 0) 500 return 0; 501 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d); 502 parport_epilogue(pp); 503 return d; 504 } 505 506 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 507 { 508 struct mos7715_parport *mos_parport = pp->private_data; 509 __u8 data; 510 511 if (parport_prologue(pp) < 0) 512 return; 513 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 514 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data); 515 mos_parport->shadowDCR = data; 516 parport_epilogue(pp); 517 } 518 519 static unsigned char parport_mos7715_read_control(struct parport *pp) 520 { 521 struct mos7715_parport *mos_parport; 522 __u8 dcr; 523 524 spin_lock(&release_lock); 525 mos_parport = pp->private_data; 526 if (unlikely(mos_parport == NULL)) { 527 spin_unlock(&release_lock); 528 return 0; 529 } 530 dcr = mos_parport->shadowDCR & 0x0f; 531 spin_unlock(&release_lock); 532 return dcr; 533 } 534 535 static unsigned char parport_mos7715_frob_control(struct parport *pp, 536 unsigned char mask, 537 unsigned char val) 538 { 539 struct mos7715_parport *mos_parport = pp->private_data; 540 __u8 dcr; 541 542 mask &= 0x0f; 543 val &= 0x0f; 544 if (parport_prologue(pp) < 0) 545 return 0; 546 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 547 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 548 mos_parport->shadowDCR); 549 dcr = mos_parport->shadowDCR & 0x0f; 550 parport_epilogue(pp); 551 return dcr; 552 } 553 554 static unsigned char parport_mos7715_read_status(struct parport *pp) 555 { 556 unsigned char status; 557 struct mos7715_parport *mos_parport; 558 559 spin_lock(&release_lock); 560 mos_parport = pp->private_data; 561 if (unlikely(mos_parport == NULL)) { /* release called */ 562 spin_unlock(&release_lock); 563 return 0; 564 } 565 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 566 spin_unlock(&release_lock); 567 return status; 568 } 569 570 static void parport_mos7715_enable_irq(struct parport *pp) 571 { 572 } 573 574 static void parport_mos7715_disable_irq(struct parport *pp) 575 { 576 } 577 578 static void parport_mos7715_data_forward(struct parport *pp) 579 { 580 struct mos7715_parport *mos_parport = pp->private_data; 581 582 if (parport_prologue(pp) < 0) 583 return; 584 mos7715_change_mode(mos_parport, PS2); 585 mos_parport->shadowDCR &= ~0x20; 586 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 587 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, MOS7720_DCR, 600 mos_parport->shadowDCR); 601 parport_epilogue(pp); 602 } 603 604 static void parport_mos7715_init_state(struct pardevice *dev, 605 struct parport_state *s) 606 { 607 s->u.pc.ctr = DCR_INIT_VAL; 608 s->u.pc.ecr = ECR_INIT_VAL; 609 } 610 611 /* N.B. Parport core code requires that this function not block */ 612 static void parport_mos7715_save_state(struct parport *pp, 613 struct parport_state *s) 614 { 615 struct mos7715_parport *mos_parport; 616 617 spin_lock(&release_lock); 618 mos_parport = pp->private_data; 619 if (unlikely(mos_parport == NULL)) { /* release called */ 620 spin_unlock(&release_lock); 621 return; 622 } 623 s->u.pc.ctr = mos_parport->shadowDCR; 624 s->u.pc.ecr = mos_parport->shadowECR; 625 spin_unlock(&release_lock); 626 } 627 628 /* N.B. Parport core code requires that this function not block */ 629 static void parport_mos7715_restore_state(struct parport *pp, 630 struct parport_state *s) 631 { 632 struct mos7715_parport *mos_parport; 633 634 spin_lock(&release_lock); 635 mos_parport = pp->private_data; 636 if (unlikely(mos_parport == NULL)) { /* release called */ 637 spin_unlock(&release_lock); 638 return; 639 } 640 write_parport_reg_nonblock(mos_parport, MOS7720_DCR, 641 mos_parport->shadowDCR); 642 write_parport_reg_nonblock(mos_parport, MOS7720_ECR, 643 mos_parport->shadowECR); 644 spin_unlock(&release_lock); 645 } 646 647 static size_t parport_mos7715_write_compat(struct parport *pp, 648 const void *buffer, 649 size_t len, int flags) 650 { 651 int retval; 652 struct mos7715_parport *mos_parport = pp->private_data; 653 int actual_len; 654 655 if (parport_prologue(pp) < 0) 656 return 0; 657 mos7715_change_mode(mos_parport, PPF); 658 retval = usb_bulk_msg(mos_parport->serial->dev, 659 usb_sndbulkpipe(mos_parport->serial->dev, 2), 660 (void *)buffer, len, &actual_len, 661 MOS_WDR_TIMEOUT); 662 parport_epilogue(pp); 663 if (retval) { 664 dev_err(&mos_parport->serial->dev->dev, 665 "mos7720: usb_bulk_msg() failed: %d\n", retval); 666 return 0; 667 } 668 return actual_len; 669 } 670 671 static struct parport_operations parport_mos7715_ops = { 672 .owner = THIS_MODULE, 673 .write_data = parport_mos7715_write_data, 674 .read_data = parport_mos7715_read_data, 675 676 .write_control = parport_mos7715_write_control, 677 .read_control = parport_mos7715_read_control, 678 .frob_control = parport_mos7715_frob_control, 679 680 .read_status = parport_mos7715_read_status, 681 682 .enable_irq = parport_mos7715_enable_irq, 683 .disable_irq = parport_mos7715_disable_irq, 684 685 .data_forward = parport_mos7715_data_forward, 686 .data_reverse = parport_mos7715_data_reverse, 687 688 .init_state = parport_mos7715_init_state, 689 .save_state = parport_mos7715_save_state, 690 .restore_state = parport_mos7715_restore_state, 691 692 .compat_write_data = parport_mos7715_write_compat, 693 694 .nibble_read_data = parport_ieee1284_read_nibble, 695 .byte_read_data = parport_ieee1284_read_byte, 696 }; 697 698 /* 699 * Allocate and initialize parallel port control struct, initialize 700 * the parallel port hardware device, and register with the parport subsystem. 701 */ 702 static int mos7715_parport_init(struct usb_serial *serial) 703 { 704 struct mos7715_parport *mos_parport; 705 706 /* allocate and initialize parallel port control struct */ 707 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 708 if (!mos_parport) 709 return -ENOMEM; 710 711 mos_parport->msg_pending = false; 712 kref_init(&mos_parport->ref_count); 713 spin_lock_init(&mos_parport->listlock); 714 INIT_LIST_HEAD(&mos_parport->active_urbs); 715 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 716 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 717 mos_parport->serial = serial; 718 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 719 (unsigned long) mos_parport); 720 init_completion(&mos_parport->syncmsg_compl); 721 722 /* cycle parallel port reset bit */ 723 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80); 724 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00); 725 726 /* initialize device registers */ 727 mos_parport->shadowDCR = DCR_INIT_VAL; 728 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 729 mos_parport->shadowDCR); 730 mos_parport->shadowECR = ECR_INIT_VAL; 731 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 732 mos_parport->shadowECR); 733 734 /* register with parport core */ 735 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 736 PARPORT_DMA_NONE, 737 &parport_mos7715_ops); 738 if (mos_parport->pp == NULL) { 739 dev_err(&serial->interface->dev, 740 "Could not register parport\n"); 741 kref_put(&mos_parport->ref_count, destroy_mos_parport); 742 return -EIO; 743 } 744 mos_parport->pp->private_data = mos_parport; 745 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 746 mos_parport->pp->dev = &serial->interface->dev; 747 parport_announce_port(mos_parport->pp); 748 749 return 0; 750 } 751 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 752 753 /* 754 * mos7720_interrupt_callback 755 * this is the callback function for when we have received data on the 756 * interrupt endpoint. 757 */ 758 static void mos7720_interrupt_callback(struct urb *urb) 759 { 760 int result; 761 int length; 762 int status = urb->status; 763 struct device *dev = &urb->dev->dev; 764 __u8 *data; 765 __u8 sp1; 766 __u8 sp2; 767 768 switch (status) { 769 case 0: 770 /* success */ 771 break; 772 case -ECONNRESET: 773 case -ENOENT: 774 case -ESHUTDOWN: 775 /* this urb is terminated, clean up */ 776 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 777 return; 778 default: 779 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 780 goto exit; 781 } 782 783 length = urb->actual_length; 784 data = urb->transfer_buffer; 785 786 /* Moschip get 4 bytes 787 * Byte 1 IIR Port 1 (port.number is 0) 788 * Byte 2 IIR Port 2 (port.number is 1) 789 * Byte 3 -------------- 790 * Byte 4 FIFO status for both */ 791 792 /* the above description is inverted 793 * oneukum 2007-03-14 */ 794 795 if (unlikely(length != 4)) { 796 dev_dbg(dev, "Wrong data !!!\n"); 797 return; 798 } 799 800 sp1 = data[3]; 801 sp2 = data[2]; 802 803 if ((sp1 | sp2) & 0x01) { 804 /* No Interrupt Pending in both the ports */ 805 dev_dbg(dev, "No Interrupt !!!\n"); 806 } else { 807 switch (sp1 & 0x0f) { 808 case SERIAL_IIR_RLS: 809 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 810 break; 811 case SERIAL_IIR_CTI: 812 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 813 break; 814 case SERIAL_IIR_MS: 815 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 816 break; 817 } 818 819 switch (sp2 & 0x0f) { 820 case SERIAL_IIR_RLS: 821 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 822 break; 823 case SERIAL_IIR_CTI: 824 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 825 break; 826 case SERIAL_IIR_MS: 827 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 828 break; 829 } 830 } 831 832 exit: 833 result = usb_submit_urb(urb, GFP_ATOMIC); 834 if (result) 835 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 836 } 837 838 /* 839 * mos7715_interrupt_callback 840 * this is the 7715's callback function for when we have received data on 841 * the interrupt endpoint. 842 */ 843 static void mos7715_interrupt_callback(struct urb *urb) 844 { 845 int result; 846 int length; 847 int status = urb->status; 848 struct device *dev = &urb->dev->dev; 849 __u8 *data; 850 __u8 iir; 851 852 switch (status) { 853 case 0: 854 /* success */ 855 break; 856 case -ECONNRESET: 857 case -ENOENT: 858 case -ESHUTDOWN: 859 case -ENODEV: 860 /* this urb is terminated, clean up */ 861 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 862 return; 863 default: 864 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 865 goto exit; 866 } 867 868 length = urb->actual_length; 869 data = urb->transfer_buffer; 870 871 /* Structure of data from 7715 device: 872 * Byte 1: IIR serial Port 873 * Byte 2: unused 874 * Byte 2: DSR parallel port 875 * Byte 4: FIFO status for both */ 876 877 if (unlikely(length != 4)) { 878 dev_dbg(dev, "Wrong data !!!\n"); 879 return; 880 } 881 882 iir = data[0]; 883 if (!(iir & 0x01)) { /* serial port interrupt pending */ 884 switch (iir & 0x0f) { 885 case SERIAL_IIR_RLS: 886 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n"); 887 break; 888 case SERIAL_IIR_CTI: 889 dev_dbg(dev, "Serial Port: Receiver time out\n"); 890 break; 891 case SERIAL_IIR_MS: 892 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 893 break; 894 } 895 } 896 897 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 898 { /* update local copy of DSR reg */ 899 struct usb_serial_port *port = urb->context; 900 struct mos7715_parport *mos_parport = port->serial->private; 901 if (unlikely(mos_parport == NULL)) 902 return; 903 atomic_set(&mos_parport->shadowDSR, data[2]); 904 } 905 #endif 906 907 exit: 908 result = usb_submit_urb(urb, GFP_ATOMIC); 909 if (result) 910 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 911 } 912 913 /* 914 * mos7720_bulk_in_callback 915 * this is the callback function for when we have received data on the 916 * bulk in endpoint. 917 */ 918 static void mos7720_bulk_in_callback(struct urb *urb) 919 { 920 int retval; 921 unsigned char *data ; 922 struct usb_serial_port *port; 923 int status = urb->status; 924 925 if (status) { 926 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 927 return; 928 } 929 930 port = urb->context; 931 932 dev_dbg(&port->dev, "Entering...%s\n", __func__); 933 934 data = urb->transfer_buffer; 935 936 if (urb->actual_length) { 937 tty_insert_flip_string(&port->port, data, urb->actual_length); 938 tty_flip_buffer_push(&port->port); 939 } 940 941 if (port->read_urb->status != -EINPROGRESS) { 942 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 943 if (retval) 944 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 945 } 946 } 947 948 /* 949 * mos7720_bulk_out_data_callback 950 * this is the callback function for when we have finished sending serial 951 * data on the bulk out endpoint. 952 */ 953 static void mos7720_bulk_out_data_callback(struct urb *urb) 954 { 955 struct moschip_port *mos7720_port; 956 int status = urb->status; 957 958 if (status) { 959 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 960 return; 961 } 962 963 mos7720_port = urb->context; 964 if (!mos7720_port) { 965 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 966 return ; 967 } 968 969 if (mos7720_port->open) 970 tty_port_tty_wakeup(&mos7720_port->port->port); 971 } 972 973 static int mos77xx_calc_num_ports(struct usb_serial *serial, 974 struct usb_serial_endpoints *epds) 975 { 976 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 977 978 if (product == MOSCHIP_DEVICE_ID_7715) { 979 /* 980 * The 7715 uses the first bulk in/out endpoint pair for the 981 * parallel port, and the second for the serial port. We swap 982 * the endpoint descriptors here so that the the first and 983 * only registered port structure uses the serial-port 984 * endpoints. 985 */ 986 swap(epds->bulk_in[0], epds->bulk_in[1]); 987 swap(epds->bulk_out[0], epds->bulk_out[1]); 988 989 return 1; 990 } 991 992 return 2; 993 } 994 995 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 996 { 997 struct usb_serial *serial; 998 struct urb *urb; 999 struct moschip_port *mos7720_port; 1000 int response; 1001 int port_number; 1002 __u8 data; 1003 int allocated_urbs = 0; 1004 int j; 1005 1006 serial = port->serial; 1007 1008 mos7720_port = usb_get_serial_port_data(port); 1009 if (mos7720_port == NULL) 1010 return -ENODEV; 1011 1012 usb_clear_halt(serial->dev, port->write_urb->pipe); 1013 usb_clear_halt(serial->dev, port->read_urb->pipe); 1014 1015 /* Initialising the write urb pool */ 1016 for (j = 0; j < NUM_URBS; ++j) { 1017 urb = usb_alloc_urb(0, GFP_KERNEL); 1018 mos7720_port->write_urb_pool[j] = urb; 1019 if (!urb) 1020 continue; 1021 1022 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1023 GFP_KERNEL); 1024 if (!urb->transfer_buffer) { 1025 usb_free_urb(mos7720_port->write_urb_pool[j]); 1026 mos7720_port->write_urb_pool[j] = NULL; 1027 continue; 1028 } 1029 allocated_urbs++; 1030 } 1031 1032 if (!allocated_urbs) 1033 return -ENOMEM; 1034 1035 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1036 * 1037 * Register Index 1038 * 0 : MOS7720_THR/MOS7720_RHR 1039 * 1 : MOS7720_IER 1040 * 2 : MOS7720_FCR 1041 * 3 : MOS7720_LCR 1042 * 4 : MOS7720_MCR 1043 * 5 : MOS7720_LSR 1044 * 6 : MOS7720_MSR 1045 * 7 : MOS7720_SPR 1046 * 1047 * 0x08 : SP1/2 Control Reg 1048 */ 1049 port_number = port->port_number; 1050 read_mos_reg(serial, port_number, MOS7720_LSR, &data); 1051 1052 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1053 1054 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02); 1055 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02); 1056 1057 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1058 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1059 1060 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1061 mos7720_port->shadowLCR = 0x03; 1062 write_mos_reg(serial, port_number, MOS7720_LCR, 1063 mos7720_port->shadowLCR); 1064 mos7720_port->shadowMCR = 0x0b; 1065 write_mos_reg(serial, port_number, MOS7720_MCR, 1066 mos7720_port->shadowMCR); 1067 1068 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00); 1069 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data); 1070 data = data | (port->port_number + 1); 1071 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data); 1072 mos7720_port->shadowLCR = 0x83; 1073 write_mos_reg(serial, port_number, MOS7720_LCR, 1074 mos7720_port->shadowLCR); 1075 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c); 1076 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1077 mos7720_port->shadowLCR = 0x03; 1078 write_mos_reg(serial, port_number, MOS7720_LCR, 1079 mos7720_port->shadowLCR); 1080 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1081 1082 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1083 if (response) 1084 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1085 __func__, response); 1086 1087 /* initialize our port settings */ 1088 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1089 1090 /* send a open port command */ 1091 mos7720_port->open = 1; 1092 1093 return 0; 1094 } 1095 1096 /* 1097 * mos7720_chars_in_buffer 1098 * this function is called by the tty driver when it wants to know how many 1099 * bytes of data we currently have outstanding in the port (data that has 1100 * been written, but hasn't made it out the port yet) 1101 * If successful, we return the number of bytes left to be written in the 1102 * system, 1103 * Otherwise we return a negative error number. 1104 */ 1105 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1106 { 1107 struct usb_serial_port *port = tty->driver_data; 1108 int i; 1109 int chars = 0; 1110 struct moschip_port *mos7720_port; 1111 1112 mos7720_port = usb_get_serial_port_data(port); 1113 if (mos7720_port == NULL) 1114 return 0; 1115 1116 for (i = 0; i < NUM_URBS; ++i) { 1117 if (mos7720_port->write_urb_pool[i] && 1118 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1119 chars += URB_TRANSFER_BUFFER_SIZE; 1120 } 1121 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1122 return chars; 1123 } 1124 1125 static void mos7720_close(struct usb_serial_port *port) 1126 { 1127 struct usb_serial *serial; 1128 struct moschip_port *mos7720_port; 1129 int j; 1130 1131 serial = port->serial; 1132 1133 mos7720_port = usb_get_serial_port_data(port); 1134 if (mos7720_port == NULL) 1135 return; 1136 1137 for (j = 0; j < NUM_URBS; ++j) 1138 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1139 1140 /* Freeing Write URBs */ 1141 for (j = 0; j < NUM_URBS; ++j) { 1142 if (mos7720_port->write_urb_pool[j]) { 1143 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1144 usb_free_urb(mos7720_port->write_urb_pool[j]); 1145 } 1146 } 1147 1148 /* While closing port, shutdown all bulk read, write * 1149 * and interrupt read if they exists, otherwise nop */ 1150 usb_kill_urb(port->write_urb); 1151 usb_kill_urb(port->read_urb); 1152 1153 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); 1154 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); 1155 1156 mos7720_port->open = 0; 1157 } 1158 1159 static void mos7720_break(struct tty_struct *tty, int break_state) 1160 { 1161 struct usb_serial_port *port = tty->driver_data; 1162 unsigned char data; 1163 struct usb_serial *serial; 1164 struct moschip_port *mos7720_port; 1165 1166 serial = port->serial; 1167 1168 mos7720_port = usb_get_serial_port_data(port); 1169 if (mos7720_port == NULL) 1170 return; 1171 1172 if (break_state == -1) 1173 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1174 else 1175 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1176 1177 mos7720_port->shadowLCR = data; 1178 write_mos_reg(serial, port->port_number, MOS7720_LCR, 1179 mos7720_port->shadowLCR); 1180 } 1181 1182 /* 1183 * mos7720_write_room 1184 * this function is called by the tty driver when it wants to know how many 1185 * bytes of data we can accept for a specific port. 1186 * If successful, we return the amount of room that we have for this port 1187 * Otherwise we return a negative error number. 1188 */ 1189 static int mos7720_write_room(struct tty_struct *tty) 1190 { 1191 struct usb_serial_port *port = tty->driver_data; 1192 struct moschip_port *mos7720_port; 1193 int room = 0; 1194 int i; 1195 1196 mos7720_port = usb_get_serial_port_data(port); 1197 if (mos7720_port == NULL) 1198 return -ENODEV; 1199 1200 /* FIXME: Locking */ 1201 for (i = 0; i < NUM_URBS; ++i) { 1202 if (mos7720_port->write_urb_pool[i] && 1203 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1204 room += URB_TRANSFER_BUFFER_SIZE; 1205 } 1206 1207 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1208 return room; 1209 } 1210 1211 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1212 const unsigned char *data, int count) 1213 { 1214 int status; 1215 int i; 1216 int bytes_sent = 0; 1217 int transfer_size; 1218 1219 struct moschip_port *mos7720_port; 1220 struct usb_serial *serial; 1221 struct urb *urb; 1222 const unsigned char *current_position = data; 1223 1224 serial = port->serial; 1225 1226 mos7720_port = usb_get_serial_port_data(port); 1227 if (mos7720_port == NULL) 1228 return -ENODEV; 1229 1230 /* try to find a free urb in the list */ 1231 urb = NULL; 1232 1233 for (i = 0; i < NUM_URBS; ++i) { 1234 if (mos7720_port->write_urb_pool[i] && 1235 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1236 urb = mos7720_port->write_urb_pool[i]; 1237 dev_dbg(&port->dev, "URB:%d\n", i); 1238 break; 1239 } 1240 } 1241 1242 if (urb == NULL) { 1243 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1244 goto exit; 1245 } 1246 1247 if (urb->transfer_buffer == NULL) { 1248 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1249 GFP_ATOMIC); 1250 if (!urb->transfer_buffer) 1251 goto exit; 1252 } 1253 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1254 1255 memcpy(urb->transfer_buffer, current_position, transfer_size); 1256 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1257 urb->transfer_buffer); 1258 1259 /* fill urb with data and submit */ 1260 usb_fill_bulk_urb(urb, serial->dev, 1261 usb_sndbulkpipe(serial->dev, 1262 port->bulk_out_endpointAddress), 1263 urb->transfer_buffer, transfer_size, 1264 mos7720_bulk_out_data_callback, mos7720_port); 1265 1266 /* send it down the pipe */ 1267 status = usb_submit_urb(urb, GFP_ATOMIC); 1268 if (status) { 1269 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1270 "with status = %d\n", __func__, status); 1271 bytes_sent = status; 1272 goto exit; 1273 } 1274 bytes_sent = transfer_size; 1275 1276 exit: 1277 return bytes_sent; 1278 } 1279 1280 static void mos7720_throttle(struct tty_struct *tty) 1281 { 1282 struct usb_serial_port *port = tty->driver_data; 1283 struct moschip_port *mos7720_port; 1284 int status; 1285 1286 mos7720_port = usb_get_serial_port_data(port); 1287 1288 if (mos7720_port == NULL) 1289 return; 1290 1291 if (!mos7720_port->open) { 1292 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1293 return; 1294 } 1295 1296 /* if we are implementing XON/XOFF, send the stop character */ 1297 if (I_IXOFF(tty)) { 1298 unsigned char stop_char = STOP_CHAR(tty); 1299 status = mos7720_write(tty, port, &stop_char, 1); 1300 if (status <= 0) 1301 return; 1302 } 1303 1304 /* if we are implementing RTS/CTS, toggle that line */ 1305 if (C_CRTSCTS(tty)) { 1306 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1307 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1308 mos7720_port->shadowMCR); 1309 } 1310 } 1311 1312 static void mos7720_unthrottle(struct tty_struct *tty) 1313 { 1314 struct usb_serial_port *port = tty->driver_data; 1315 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1316 int status; 1317 1318 if (mos7720_port == NULL) 1319 return; 1320 1321 if (!mos7720_port->open) { 1322 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1323 return; 1324 } 1325 1326 /* if we are implementing XON/XOFF, send the start character */ 1327 if (I_IXOFF(tty)) { 1328 unsigned char start_char = START_CHAR(tty); 1329 status = mos7720_write(tty, port, &start_char, 1); 1330 if (status <= 0) 1331 return; 1332 } 1333 1334 /* if we are implementing RTS/CTS, toggle that line */ 1335 if (C_CRTSCTS(tty)) { 1336 mos7720_port->shadowMCR |= UART_MCR_RTS; 1337 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1338 mos7720_port->shadowMCR); 1339 } 1340 } 1341 1342 /* FIXME: this function does not work */ 1343 static int set_higher_rates(struct moschip_port *mos7720_port, 1344 unsigned int baud) 1345 { 1346 struct usb_serial_port *port; 1347 struct usb_serial *serial; 1348 int port_number; 1349 enum mos_regs sp_reg; 1350 if (mos7720_port == NULL) 1351 return -EINVAL; 1352 1353 port = mos7720_port->port; 1354 serial = port->serial; 1355 1356 /*********************************************** 1357 * Init Sequence for higher rates 1358 ***********************************************/ 1359 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1360 port_number = port->port_number; 1361 1362 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1363 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1364 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1365 mos7720_port->shadowMCR = 0x0b; 1366 write_mos_reg(serial, port_number, MOS7720_MCR, 1367 mos7720_port->shadowMCR); 1368 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1369 1370 /*********************************************** 1371 * Set for higher rates * 1372 ***********************************************/ 1373 /* writing baud rate verbatum into uart clock field clearly not right */ 1374 if (port_number == 0) 1375 sp_reg = MOS7720_SP1_REG; 1376 else 1377 sp_reg = MOS7720_SP2_REG; 1378 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1379 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1380 mos7720_port->shadowMCR = 0x2b; 1381 write_mos_reg(serial, port_number, MOS7720_MCR, 1382 mos7720_port->shadowMCR); 1383 1384 /*********************************************** 1385 * Set DLL/DLM 1386 ***********************************************/ 1387 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1388 write_mos_reg(serial, port_number, MOS7720_LCR, 1389 mos7720_port->shadowLCR); 1390 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1391 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1392 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1393 write_mos_reg(serial, port_number, MOS7720_LCR, 1394 mos7720_port->shadowLCR); 1395 1396 return 0; 1397 } 1398 1399 /* baud rate information */ 1400 struct divisor_table_entry { 1401 __u32 baudrate; 1402 __u16 divisor; 1403 }; 1404 1405 /* Define table of divisors for moschip 7720 hardware * 1406 * These assume a 3.6864MHz crystal, the standard /16, and * 1407 * MCR.7 = 0. */ 1408 static const struct divisor_table_entry divisor_table[] = { 1409 { 50, 2304}, 1410 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1411 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1412 { 150, 768}, 1413 { 300, 384}, 1414 { 600, 192}, 1415 { 1200, 96}, 1416 { 1800, 64}, 1417 { 2400, 48}, 1418 { 4800, 24}, 1419 { 7200, 16}, 1420 { 9600, 12}, 1421 { 19200, 6}, 1422 { 38400, 3}, 1423 { 57600, 2}, 1424 { 115200, 1}, 1425 }; 1426 1427 /***************************************************************************** 1428 * calc_baud_rate_divisor 1429 * this function calculates the proper baud rate divisor for the specified 1430 * baud rate. 1431 *****************************************************************************/ 1432 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1433 { 1434 int i; 1435 __u16 custom; 1436 __u16 round1; 1437 __u16 round; 1438 1439 1440 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1441 1442 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1443 if (divisor_table[i].baudrate == baudrate) { 1444 *divisor = divisor_table[i].divisor; 1445 return 0; 1446 } 1447 } 1448 1449 /* After trying for all the standard baud rates * 1450 * Try calculating the divisor for this baud rate */ 1451 if (baudrate > 75 && baudrate < 230400) { 1452 /* get the divisor */ 1453 custom = (__u16)(230400L / baudrate); 1454 1455 /* Check for round off */ 1456 round1 = (__u16)(2304000L / baudrate); 1457 round = (__u16)(round1 - (custom * 10)); 1458 if (round > 4) 1459 custom++; 1460 *divisor = custom; 1461 1462 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1463 return 0; 1464 } 1465 1466 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1467 return -EINVAL; 1468 } 1469 1470 /* 1471 * send_cmd_write_baud_rate 1472 * this function sends the proper command to change the baud rate of the 1473 * specified port. 1474 */ 1475 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1476 int baudrate) 1477 { 1478 struct usb_serial_port *port; 1479 struct usb_serial *serial; 1480 int divisor; 1481 int status; 1482 unsigned char number; 1483 1484 if (mos7720_port == NULL) 1485 return -1; 1486 1487 port = mos7720_port->port; 1488 serial = port->serial; 1489 1490 number = port->port_number; 1491 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1492 1493 /* Calculate the Divisor */ 1494 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1495 if (status) { 1496 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1497 return status; 1498 } 1499 1500 /* Enable access to divisor latch */ 1501 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1502 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1503 1504 /* Write the divisor */ 1505 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1506 write_mos_reg(serial, number, MOS7720_DLM, 1507 (__u8)((divisor & 0xff00) >> 8)); 1508 1509 /* Disable access to divisor latch */ 1510 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1511 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1512 1513 return status; 1514 } 1515 1516 /* 1517 * change_port_settings 1518 * This routine is called to set the UART on the device to match 1519 * the specified new settings. 1520 */ 1521 static void change_port_settings(struct tty_struct *tty, 1522 struct moschip_port *mos7720_port, 1523 struct ktermios *old_termios) 1524 { 1525 struct usb_serial_port *port; 1526 struct usb_serial *serial; 1527 int baud; 1528 unsigned cflag; 1529 unsigned iflag; 1530 __u8 mask = 0xff; 1531 __u8 lData; 1532 __u8 lParity; 1533 __u8 lStop; 1534 int status; 1535 int port_number; 1536 1537 if (mos7720_port == NULL) 1538 return ; 1539 1540 port = mos7720_port->port; 1541 serial = port->serial; 1542 port_number = port->port_number; 1543 1544 if (!mos7720_port->open) { 1545 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1546 return; 1547 } 1548 1549 lData = UART_LCR_WLEN8; 1550 lStop = 0x00; /* 1 stop bit */ 1551 lParity = 0x00; /* No parity */ 1552 1553 cflag = tty->termios.c_cflag; 1554 iflag = tty->termios.c_iflag; 1555 1556 /* Change the number of bits */ 1557 switch (cflag & CSIZE) { 1558 case CS5: 1559 lData = UART_LCR_WLEN5; 1560 mask = 0x1f; 1561 break; 1562 1563 case CS6: 1564 lData = UART_LCR_WLEN6; 1565 mask = 0x3f; 1566 break; 1567 1568 case CS7: 1569 lData = UART_LCR_WLEN7; 1570 mask = 0x7f; 1571 break; 1572 default: 1573 case CS8: 1574 lData = UART_LCR_WLEN8; 1575 break; 1576 } 1577 1578 /* Change the Parity bit */ 1579 if (cflag & PARENB) { 1580 if (cflag & PARODD) { 1581 lParity = UART_LCR_PARITY; 1582 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1583 } else { 1584 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1585 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1586 } 1587 1588 } else { 1589 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1590 } 1591 1592 if (cflag & CMSPAR) 1593 lParity = lParity | 0x20; 1594 1595 /* Change the Stop bit */ 1596 if (cflag & CSTOPB) { 1597 lStop = UART_LCR_STOP; 1598 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1599 } else { 1600 lStop = 0x00; 1601 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1602 } 1603 1604 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1605 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1606 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1607 1608 /* Update the LCR with the correct value */ 1609 mos7720_port->shadowLCR &= 1610 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1611 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1612 1613 1614 /* Disable Interrupts */ 1615 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1616 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1617 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1618 1619 /* Send the updated LCR value to the mos7720 */ 1620 write_mos_reg(serial, port_number, MOS7720_LCR, 1621 mos7720_port->shadowLCR); 1622 mos7720_port->shadowMCR = 0x0b; 1623 write_mos_reg(serial, port_number, MOS7720_MCR, 1624 mos7720_port->shadowMCR); 1625 1626 /* set up the MCR register and send it to the mos7720 */ 1627 mos7720_port->shadowMCR = UART_MCR_OUT2; 1628 if (cflag & CBAUD) 1629 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1630 1631 if (cflag & CRTSCTS) { 1632 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1633 /* To set hardware flow control to the specified * 1634 * serial port, in SP1/2_CONTROL_REG */ 1635 if (port_number) 1636 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1637 0x01); 1638 else 1639 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1640 0x02); 1641 1642 } else 1643 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1644 1645 write_mos_reg(serial, port_number, MOS7720_MCR, 1646 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, MOS7720_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, MOS7720_IER, 0x0c); 1671 1672 if (port->read_urb->status != -EINPROGRESS) { 1673 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 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 struct usb_serial *serial; 1689 struct moschip_port *mos7720_port; 1690 1691 serial = port->serial; 1692 1693 mos7720_port = usb_get_serial_port_data(port); 1694 1695 if (mos7720_port == NULL) 1696 return; 1697 1698 if (!mos7720_port->open) { 1699 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1700 return; 1701 } 1702 1703 /* change the port settings to the new ones specified */ 1704 change_port_settings(tty, mos7720_port, old_termios); 1705 1706 if (port->read_urb->status != -EINPROGRESS) { 1707 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1708 if (status) 1709 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1710 } 1711 } 1712 1713 /* 1714 * get_lsr_info - get line status register info 1715 * 1716 * Purpose: Let user call ioctl() to get info when the UART physically 1717 * is emptied. On bus types like RS485, the transmitter must 1718 * release the bus after transmitting. This must be done when 1719 * the transmit shift register is empty, not be done when the 1720 * transmit holding register is empty. This functionality 1721 * allows an RS485 driver to be written in user space. 1722 */ 1723 static int get_lsr_info(struct tty_struct *tty, 1724 struct moschip_port *mos7720_port, unsigned int __user *value) 1725 { 1726 struct usb_serial_port *port = tty->driver_data; 1727 unsigned int result = 0; 1728 unsigned char data = 0; 1729 int port_number = port->port_number; 1730 int count; 1731 1732 count = mos7720_chars_in_buffer(tty); 1733 if (count == 0) { 1734 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1735 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1736 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1737 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1738 result = TIOCSER_TEMT; 1739 } 1740 } 1741 if (copy_to_user(value, &result, sizeof(int))) 1742 return -EFAULT; 1743 return 0; 1744 } 1745 1746 static int mos7720_tiocmget(struct tty_struct *tty) 1747 { 1748 struct usb_serial_port *port = tty->driver_data; 1749 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1750 unsigned int result = 0; 1751 unsigned int mcr ; 1752 unsigned int msr ; 1753 1754 mcr = mos7720_port->shadowMCR; 1755 msr = mos7720_port->shadowMSR; 1756 1757 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1758 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1759 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1760 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1761 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1762 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1763 1764 return result; 1765 } 1766 1767 static int mos7720_tiocmset(struct tty_struct *tty, 1768 unsigned int set, unsigned int clear) 1769 { 1770 struct usb_serial_port *port = tty->driver_data; 1771 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1772 unsigned int mcr ; 1773 1774 mcr = mos7720_port->shadowMCR; 1775 1776 if (set & TIOCM_RTS) 1777 mcr |= UART_MCR_RTS; 1778 if (set & TIOCM_DTR) 1779 mcr |= UART_MCR_DTR; 1780 if (set & TIOCM_LOOP) 1781 mcr |= UART_MCR_LOOP; 1782 1783 if (clear & TIOCM_RTS) 1784 mcr &= ~UART_MCR_RTS; 1785 if (clear & TIOCM_DTR) 1786 mcr &= ~UART_MCR_DTR; 1787 if (clear & TIOCM_LOOP) 1788 mcr &= ~UART_MCR_LOOP; 1789 1790 mos7720_port->shadowMCR = mcr; 1791 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1792 mos7720_port->shadowMCR); 1793 1794 return 0; 1795 } 1796 1797 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1798 unsigned int __user *value) 1799 { 1800 unsigned int mcr; 1801 unsigned int arg; 1802 1803 struct usb_serial_port *port; 1804 1805 if (mos7720_port == NULL) 1806 return -1; 1807 1808 port = (struct usb_serial_port *)mos7720_port->port; 1809 mcr = mos7720_port->shadowMCR; 1810 1811 if (copy_from_user(&arg, value, sizeof(int))) 1812 return -EFAULT; 1813 1814 switch (cmd) { 1815 case TIOCMBIS: 1816 if (arg & TIOCM_RTS) 1817 mcr |= UART_MCR_RTS; 1818 if (arg & TIOCM_DTR) 1819 mcr |= UART_MCR_RTS; 1820 if (arg & TIOCM_LOOP) 1821 mcr |= UART_MCR_LOOP; 1822 break; 1823 1824 case TIOCMBIC: 1825 if (arg & TIOCM_RTS) 1826 mcr &= ~UART_MCR_RTS; 1827 if (arg & TIOCM_DTR) 1828 mcr &= ~UART_MCR_RTS; 1829 if (arg & TIOCM_LOOP) 1830 mcr &= ~UART_MCR_LOOP; 1831 break; 1832 1833 } 1834 1835 mos7720_port->shadowMCR = mcr; 1836 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1837 mos7720_port->shadowMCR); 1838 1839 return 0; 1840 } 1841 1842 static int get_serial_info(struct moschip_port *mos7720_port, 1843 struct serial_struct __user *retinfo) 1844 { 1845 struct serial_struct tmp; 1846 1847 memset(&tmp, 0, sizeof(tmp)); 1848 1849 tmp.type = PORT_16550A; 1850 tmp.line = mos7720_port->port->minor; 1851 tmp.port = mos7720_port->port->port_number; 1852 tmp.irq = 0; 1853 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1854 tmp.baud_base = 9600; 1855 tmp.close_delay = 5*HZ; 1856 tmp.closing_wait = 30*HZ; 1857 1858 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1859 return -EFAULT; 1860 return 0; 1861 } 1862 1863 static int mos7720_ioctl(struct tty_struct *tty, 1864 unsigned int cmd, unsigned long arg) 1865 { 1866 struct usb_serial_port *port = tty->driver_data; 1867 struct moschip_port *mos7720_port; 1868 1869 mos7720_port = usb_get_serial_port_data(port); 1870 if (mos7720_port == NULL) 1871 return -ENODEV; 1872 1873 switch (cmd) { 1874 case TIOCSERGETLSR: 1875 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1876 return get_lsr_info(tty, mos7720_port, 1877 (unsigned int __user *)arg); 1878 1879 /* FIXME: These should be using the mode methods */ 1880 case TIOCMBIS: 1881 case TIOCMBIC: 1882 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1883 return set_modem_info(mos7720_port, cmd, 1884 (unsigned int __user *)arg); 1885 1886 case TIOCGSERIAL: 1887 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1888 return get_serial_info(mos7720_port, 1889 (struct serial_struct __user *)arg); 1890 } 1891 1892 return -ENOIOCTLCMD; 1893 } 1894 1895 static int mos7720_startup(struct usb_serial *serial) 1896 { 1897 struct usb_device *dev; 1898 char data; 1899 u16 product; 1900 int ret_val; 1901 1902 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1903 dev = serial->dev; 1904 1905 /* setting configuration feature to one */ 1906 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1907 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1908 1909 if (product == MOSCHIP_DEVICE_ID_7715) { 1910 struct urb *urb = serial->port[0]->interrupt_in_urb; 1911 1912 urb->complete = mos7715_interrupt_callback; 1913 1914 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1915 ret_val = mos7715_parport_init(serial); 1916 if (ret_val < 0) 1917 return ret_val; 1918 #endif 1919 } 1920 /* start the interrupt urb */ 1921 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1922 if (ret_val) { 1923 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", 1924 ret_val); 1925 } 1926 1927 /* LSR For Port 1 */ 1928 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1929 dev_dbg(&dev->dev, "LSR:%x\n", data); 1930 1931 return 0; 1932 } 1933 1934 static void mos7720_release(struct usb_serial *serial) 1935 { 1936 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1937 1938 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1939 /* close the parallel port */ 1940 1941 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1942 == MOSCHIP_DEVICE_ID_7715) { 1943 struct urbtracker *urbtrack; 1944 unsigned long flags; 1945 struct mos7715_parport *mos_parport = 1946 usb_get_serial_data(serial); 1947 1948 /* prevent NULL ptr dereference in port callbacks */ 1949 spin_lock(&release_lock); 1950 mos_parport->pp->private_data = NULL; 1951 spin_unlock(&release_lock); 1952 1953 /* wait for synchronous usb calls to return */ 1954 if (mos_parport->msg_pending) 1955 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1956 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1957 1958 parport_remove_port(mos_parport->pp); 1959 usb_set_serial_data(serial, NULL); 1960 mos_parport->serial = NULL; 1961 1962 /* if tasklet currently scheduled, wait for it to complete */ 1963 tasklet_kill(&mos_parport->urb_tasklet); 1964 1965 /* unlink any urbs sent by the tasklet */ 1966 spin_lock_irqsave(&mos_parport->listlock, flags); 1967 list_for_each_entry(urbtrack, 1968 &mos_parport->active_urbs, 1969 urblist_entry) 1970 usb_unlink_urb(urbtrack->urb); 1971 spin_unlock_irqrestore(&mos_parport->listlock, flags); 1972 parport_del_port(mos_parport->pp); 1973 1974 kref_put(&mos_parport->ref_count, destroy_mos_parport); 1975 } 1976 #endif 1977 } 1978 1979 static int mos7720_port_probe(struct usb_serial_port *port) 1980 { 1981 struct moschip_port *mos7720_port; 1982 1983 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 1984 if (!mos7720_port) 1985 return -ENOMEM; 1986 1987 mos7720_port->port = port; 1988 1989 usb_set_serial_port_data(port, mos7720_port); 1990 1991 return 0; 1992 } 1993 1994 static int mos7720_port_remove(struct usb_serial_port *port) 1995 { 1996 struct moschip_port *mos7720_port; 1997 1998 mos7720_port = usb_get_serial_port_data(port); 1999 kfree(mos7720_port); 2000 2001 return 0; 2002 } 2003 2004 static struct usb_serial_driver moschip7720_2port_driver = { 2005 .driver = { 2006 .owner = THIS_MODULE, 2007 .name = "moschip7720", 2008 }, 2009 .description = "Moschip 2 port adapter", 2010 .id_table = id_table, 2011 .num_bulk_in = 2, 2012 .num_bulk_out = 2, 2013 .num_interrupt_in = 1, 2014 .calc_num_ports = mos77xx_calc_num_ports, 2015 .open = mos7720_open, 2016 .close = mos7720_close, 2017 .throttle = mos7720_throttle, 2018 .unthrottle = mos7720_unthrottle, 2019 .attach = mos7720_startup, 2020 .release = mos7720_release, 2021 .port_probe = mos7720_port_probe, 2022 .port_remove = mos7720_port_remove, 2023 .ioctl = mos7720_ioctl, 2024 .tiocmget = mos7720_tiocmget, 2025 .tiocmset = mos7720_tiocmset, 2026 .set_termios = mos7720_set_termios, 2027 .write = mos7720_write, 2028 .write_room = mos7720_write_room, 2029 .chars_in_buffer = mos7720_chars_in_buffer, 2030 .break_ctl = mos7720_break, 2031 .read_bulk_callback = mos7720_bulk_in_callback, 2032 .read_int_callback = mos7720_interrupt_callback, 2033 }; 2034 2035 static struct usb_serial_driver * const serial_drivers[] = { 2036 &moschip7720_2port_driver, NULL 2037 }; 2038 2039 module_usb_serial_driver(serial_drivers, id_table); 2040 2041 MODULE_AUTHOR(DRIVER_AUTHOR); 2042 MODULE_DESCRIPTION(DRIVER_DESC); 2043 MODULE_LICENSE("GPL v2"); 2044