1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial converter 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/slab.h> 26 #include <linux/tty.h> 27 #include <linux/tty_driver.h> 28 #include <linux/tty_flip.h> 29 #include <linux/module.h> 30 #include <linux/spinlock.h> 31 #include <linux/serial.h> 32 #include <linux/serial_reg.h> 33 #include <linux/usb.h> 34 #include <linux/usb/serial.h> 35 #include <linux/uaccess.h> 36 #include <linux/parport.h> 37 38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 39 #define DRIVER_DESC "Moschip USB Serial Driver" 40 41 /* default urb timeout */ 42 #define MOS_WDR_TIMEOUT 5000 43 44 #define MOS_MAX_PORT 0x02 45 #define MOS_WRITE 0x0E 46 #define MOS_READ 0x0D 47 48 /* Interrupt Routines Defines */ 49 #define SERIAL_IIR_RLS 0x06 50 #define SERIAL_IIR_RDA 0x04 51 #define SERIAL_IIR_CTI 0x0c 52 #define SERIAL_IIR_THR 0x02 53 #define SERIAL_IIR_MS 0x00 54 55 #define NUM_URBS 16 /* URB Count */ 56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 57 58 /* This structure holds all of the local serial port information */ 59 struct moschip_port { 60 __u8 shadowLCR; /* last LCR value received */ 61 __u8 shadowMCR; /* last MCR value received */ 62 __u8 shadowMSR; /* last MSR value received */ 63 char open; 64 struct usb_serial_port *port; /* loop back to the owner */ 65 struct urb *write_urb_pool[NUM_URBS]; 66 }; 67 68 #define USB_VENDOR_ID_MOSCHIP 0x9710 69 #define MOSCHIP_DEVICE_ID_7720 0x7720 70 #define MOSCHIP_DEVICE_ID_7715 0x7715 71 72 static const struct usb_device_id id_table[] = { 73 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 74 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 75 { } /* terminating entry */ 76 }; 77 MODULE_DEVICE_TABLE(usb, id_table); 78 79 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 80 81 /* initial values for parport regs */ 82 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 83 #define ECR_INIT_VAL 0x00 /* SPP mode */ 84 85 struct urbtracker { 86 struct mos7715_parport *mos_parport; 87 struct list_head urblist_entry; 88 struct kref ref_count; 89 struct urb *urb; 90 struct usb_ctrlrequest *setup; 91 }; 92 93 enum mos7715_pp_modes { 94 SPP = 0<<5, 95 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 96 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 97 }; 98 99 struct mos7715_parport { 100 struct parport *pp; /* back to containing struct */ 101 struct kref ref_count; /* to instance of this struct */ 102 struct list_head deferred_urbs; /* list deferred async urbs */ 103 struct list_head active_urbs; /* list async urbs in flight */ 104 spinlock_t listlock; /* protects list access */ 105 bool msg_pending; /* usb sync call pending */ 106 struct completion syncmsg_compl; /* usb sync call completed */ 107 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 108 struct usb_serial *serial; /* back to containing struct */ 109 __u8 shadowECR; /* parallel port regs... */ 110 __u8 shadowDCR; 111 atomic_t shadowDSR; /* updated in int-in callback */ 112 }; 113 114 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 115 static DEFINE_SPINLOCK(release_lock); 116 117 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 118 119 static const unsigned int dummy; /* for clarity in register access fns */ 120 121 enum mos_regs { 122 MOS7720_THR, /* serial port regs */ 123 MOS7720_RHR, 124 MOS7720_IER, 125 MOS7720_FCR, 126 MOS7720_ISR, 127 MOS7720_LCR, 128 MOS7720_MCR, 129 MOS7720_LSR, 130 MOS7720_MSR, 131 MOS7720_SPR, 132 MOS7720_DLL, 133 MOS7720_DLM, 134 MOS7720_DPR, /* parallel port regs */ 135 MOS7720_DSR, 136 MOS7720_DCR, 137 MOS7720_ECR, 138 MOS7720_SP1_REG, /* device control regs */ 139 MOS7720_SP2_REG, /* serial port 2 (7720 only) */ 140 MOS7720_PP_REG, 141 MOS7720_SP_CONTROL_REG, 142 }; 143 144 /* 145 * Return the correct value for the Windex field of the setup packet 146 * for a control endpoint message. See the 7715 datasheet. 147 */ 148 static inline __u16 get_reg_index(enum mos_regs reg) 149 { 150 static const __u16 mos7715_index_lookup_table[] = { 151 0x00, /* MOS7720_THR */ 152 0x00, /* MOS7720_RHR */ 153 0x01, /* MOS7720_IER */ 154 0x02, /* MOS7720_FCR */ 155 0x02, /* MOS7720_ISR */ 156 0x03, /* MOS7720_LCR */ 157 0x04, /* MOS7720_MCR */ 158 0x05, /* MOS7720_LSR */ 159 0x06, /* MOS7720_MSR */ 160 0x07, /* MOS7720_SPR */ 161 0x00, /* MOS7720_DLL */ 162 0x01, /* MOS7720_DLM */ 163 0x00, /* MOS7720_DPR */ 164 0x01, /* MOS7720_DSR */ 165 0x02, /* MOS7720_DCR */ 166 0x0a, /* MOS7720_ECR */ 167 0x01, /* MOS7720_SP1_REG */ 168 0x02, /* MOS7720_SP2_REG (7720 only) */ 169 0x04, /* MOS7720_PP_REG (7715 only) */ 170 0x08, /* MOS7720_SP_CONTROL_REG */ 171 }; 172 return mos7715_index_lookup_table[reg]; 173 } 174 175 /* 176 * Return the correct value for the upper byte of the Wvalue field of 177 * the setup packet for a control endpoint message. 178 */ 179 static inline __u16 get_reg_value(enum mos_regs reg, 180 unsigned int serial_portnum) 181 { 182 if (reg >= MOS7720_SP1_REG) /* control reg */ 183 return 0x0000; 184 185 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */ 186 return 0x0100; 187 188 else /* serial port reg */ 189 return (serial_portnum + 2) << 8; 190 } 191 192 /* 193 * Write data byte to the specified device register. The data is embedded in 194 * the value field of the setup packet. serial_portnum is ignored for registers 195 * not specific to a particular serial port. 196 */ 197 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 198 enum mos_regs reg, __u8 data) 199 { 200 struct usb_device *usbdev = serial->dev; 201 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 202 __u8 request = (__u8)0x0e; 203 __u8 requesttype = (__u8)0x40; 204 __u16 index = get_reg_index(reg); 205 __u16 value = get_reg_value(reg, serial_portnum) + data; 206 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 207 index, NULL, 0, MOS_WDR_TIMEOUT); 208 if (status < 0) 209 dev_err(&usbdev->dev, 210 "mos7720: usb_control_msg() failed: %d\n", status); 211 return status; 212 } 213 214 /* 215 * Read data byte from the specified device register. The data returned by the 216 * device is embedded in the value field of the setup packet. serial_portnum is 217 * ignored for registers that are not specific to a particular serial port. 218 */ 219 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 220 enum mos_regs reg, __u8 *data) 221 { 222 struct usb_device *usbdev = serial->dev; 223 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 224 __u8 request = (__u8)0x0d; 225 __u8 requesttype = (__u8)0xc0; 226 __u16 index = get_reg_index(reg); 227 __u16 value = get_reg_value(reg, serial_portnum); 228 u8 *buf; 229 int status; 230 231 buf = kmalloc(1, GFP_KERNEL); 232 if (!buf) 233 return -ENOMEM; 234 235 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 236 index, buf, 1, MOS_WDR_TIMEOUT); 237 if (status == 1) { 238 *data = *buf; 239 } else { 240 dev_err(&usbdev->dev, 241 "mos7720: usb_control_msg() failed: %d\n", status); 242 if (status >= 0) 243 status = -EIO; 244 *data = 0; 245 } 246 247 kfree(buf); 248 249 return status; 250 } 251 252 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 253 254 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 255 enum mos7715_pp_modes mode) 256 { 257 mos_parport->shadowECR = mode; 258 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 259 mos_parport->shadowECR); 260 return 0; 261 } 262 263 static void destroy_mos_parport(struct kref *kref) 264 { 265 struct mos7715_parport *mos_parport = 266 container_of(kref, struct mos7715_parport, ref_count); 267 268 kfree(mos_parport); 269 } 270 271 static void destroy_urbtracker(struct kref *kref) 272 { 273 struct urbtracker *urbtrack = 274 container_of(kref, struct urbtracker, ref_count); 275 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 276 277 usb_free_urb(urbtrack->urb); 278 kfree(urbtrack->setup); 279 kfree(urbtrack); 280 kref_put(&mos_parport->ref_count, destroy_mos_parport); 281 } 282 283 /* 284 * This runs as a tasklet when sending an urb in a non-blocking parallel 285 * port callback had to be deferred because the disconnect mutex could not be 286 * obtained at the time. 287 */ 288 static void send_deferred_urbs(unsigned long _mos_parport) 289 { 290 int ret_val; 291 unsigned long flags; 292 struct mos7715_parport *mos_parport = (void *)_mos_parport; 293 struct urbtracker *urbtrack, *tmp; 294 struct list_head *cursor, *next; 295 struct device *dev; 296 297 /* if release function ran, game over */ 298 if (unlikely(mos_parport->serial == NULL)) 299 return; 300 301 dev = &mos_parport->serial->dev->dev; 302 303 /* try again to get the mutex */ 304 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 305 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 306 tasklet_schedule(&mos_parport->urb_tasklet); 307 return; 308 } 309 310 /* if device disconnected, game over */ 311 if (unlikely(mos_parport->serial->disconnected)) { 312 mutex_unlock(&mos_parport->serial->disc_mutex); 313 return; 314 } 315 316 spin_lock_irqsave(&mos_parport->listlock, flags); 317 if (list_empty(&mos_parport->deferred_urbs)) { 318 spin_unlock_irqrestore(&mos_parport->listlock, flags); 319 mutex_unlock(&mos_parport->serial->disc_mutex); 320 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 321 return; 322 } 323 324 /* move contents of deferred_urbs list to active_urbs list and submit */ 325 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 326 list_move_tail(cursor, &mos_parport->active_urbs); 327 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 328 urblist_entry) { 329 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 330 dev_dbg(dev, "%s: urb submitted\n", __func__); 331 if (ret_val) { 332 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 333 list_del(&urbtrack->urblist_entry); 334 kref_put(&urbtrack->ref_count, destroy_urbtracker); 335 } 336 } 337 spin_unlock_irqrestore(&mos_parport->listlock, flags); 338 mutex_unlock(&mos_parport->serial->disc_mutex); 339 } 340 341 /* callback for parallel port control urbs submitted asynchronously */ 342 static void async_complete(struct urb *urb) 343 { 344 struct urbtracker *urbtrack = urb->context; 345 int status = urb->status; 346 347 if (unlikely(status)) 348 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 349 350 /* remove the urbtracker from the active_urbs list */ 351 spin_lock(&urbtrack->mos_parport->listlock); 352 list_del(&urbtrack->urblist_entry); 353 spin_unlock(&urbtrack->mos_parport->listlock); 354 kref_put(&urbtrack->ref_count, destroy_urbtracker); 355 } 356 357 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 358 enum mos_regs reg, __u8 data) 359 { 360 struct urbtracker *urbtrack; 361 int ret_val; 362 unsigned long flags; 363 struct usb_serial *serial = mos_parport->serial; 364 struct usb_device *usbdev = serial->dev; 365 366 /* create and initialize the control urb and containing urbtracker */ 367 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 368 if (!urbtrack) 369 return -ENOMEM; 370 371 kref_get(&mos_parport->ref_count); 372 urbtrack->mos_parport = mos_parport; 373 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 374 if (!urbtrack->urb) { 375 kfree(urbtrack); 376 return -ENOMEM; 377 } 378 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC); 379 if (!urbtrack->setup) { 380 usb_free_urb(urbtrack->urb); 381 kfree(urbtrack); 382 return -ENOMEM; 383 } 384 urbtrack->setup->bRequestType = (__u8)0x40; 385 urbtrack->setup->bRequest = (__u8)0x0e; 386 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy)); 387 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg)); 388 urbtrack->setup->wLength = 0; 389 usb_fill_control_urb(urbtrack->urb, usbdev, 390 usb_sndctrlpipe(usbdev, 0), 391 (unsigned char *)urbtrack->setup, 392 NULL, 0, async_complete, urbtrack); 393 kref_init(&urbtrack->ref_count); 394 INIT_LIST_HEAD(&urbtrack->urblist_entry); 395 396 /* 397 * get the disconnect mutex, or add tracker to the deferred_urbs list 398 * and schedule a tasklet to try again later 399 */ 400 if (!mutex_trylock(&serial->disc_mutex)) { 401 spin_lock_irqsave(&mos_parport->listlock, flags); 402 list_add_tail(&urbtrack->urblist_entry, 403 &mos_parport->deferred_urbs); 404 spin_unlock_irqrestore(&mos_parport->listlock, flags); 405 tasklet_schedule(&mos_parport->urb_tasklet); 406 dev_dbg(&usbdev->dev, "tasklet scheduled\n"); 407 return 0; 408 } 409 410 /* bail if device disconnected */ 411 if (serial->disconnected) { 412 kref_put(&urbtrack->ref_count, destroy_urbtracker); 413 mutex_unlock(&serial->disc_mutex); 414 return -ENODEV; 415 } 416 417 /* add the tracker to the active_urbs list and submit */ 418 spin_lock_irqsave(&mos_parport->listlock, flags); 419 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 420 spin_unlock_irqrestore(&mos_parport->listlock, flags); 421 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 422 mutex_unlock(&serial->disc_mutex); 423 if (ret_val) { 424 dev_err(&usbdev->dev, 425 "%s: submit_urb() failed: %d\n", __func__, ret_val); 426 spin_lock_irqsave(&mos_parport->listlock, flags); 427 list_del(&urbtrack->urblist_entry); 428 spin_unlock_irqrestore(&mos_parport->listlock, flags); 429 kref_put(&urbtrack->ref_count, destroy_urbtracker); 430 return ret_val; 431 } 432 return 0; 433 } 434 435 /* 436 * This is the the common top part of all parallel port callback operations that 437 * send synchronous messages to the device. This implements convoluted locking 438 * that avoids two scenarios: (1) a port operation is called after usbserial 439 * has called our release function, at which point struct mos7715_parport has 440 * been destroyed, and (2) the device has been disconnected, but usbserial has 441 * not called the release function yet because someone has a serial port open. 442 * The shared release_lock prevents the first, and the mutex and disconnected 443 * flag maintained by usbserial covers the second. We also use the msg_pending 444 * flag to ensure that all synchronous usb message calls have completed before 445 * our release function can return. 446 */ 447 static int parport_prologue(struct parport *pp) 448 { 449 struct mos7715_parport *mos_parport; 450 451 spin_lock(&release_lock); 452 mos_parport = pp->private_data; 453 if (unlikely(mos_parport == NULL)) { 454 /* release fn called, port struct destroyed */ 455 spin_unlock(&release_lock); 456 return -1; 457 } 458 mos_parport->msg_pending = true; /* synch usb call pending */ 459 reinit_completion(&mos_parport->syncmsg_compl); 460 spin_unlock(&release_lock); 461 462 mutex_lock(&mos_parport->serial->disc_mutex); 463 if (mos_parport->serial->disconnected) { 464 /* device disconnected */ 465 mutex_unlock(&mos_parport->serial->disc_mutex); 466 mos_parport->msg_pending = false; 467 complete(&mos_parport->syncmsg_compl); 468 return -1; 469 } 470 471 return 0; 472 } 473 474 /* 475 * This is the common bottom part of all parallel port functions that send 476 * synchronous messages to the device. 477 */ 478 static inline void parport_epilogue(struct parport *pp) 479 { 480 struct mos7715_parport *mos_parport = pp->private_data; 481 mutex_unlock(&mos_parport->serial->disc_mutex); 482 mos_parport->msg_pending = false; 483 complete(&mos_parport->syncmsg_compl); 484 } 485 486 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 487 { 488 struct mos7715_parport *mos_parport = pp->private_data; 489 490 if (parport_prologue(pp) < 0) 491 return; 492 mos7715_change_mode(mos_parport, SPP); 493 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d); 494 parport_epilogue(pp); 495 } 496 497 static unsigned char parport_mos7715_read_data(struct parport *pp) 498 { 499 struct mos7715_parport *mos_parport = pp->private_data; 500 unsigned char d; 501 502 if (parport_prologue(pp) < 0) 503 return 0; 504 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d); 505 parport_epilogue(pp); 506 return d; 507 } 508 509 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 510 { 511 struct mos7715_parport *mos_parport = pp->private_data; 512 __u8 data; 513 514 if (parport_prologue(pp) < 0) 515 return; 516 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 517 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data); 518 mos_parport->shadowDCR = data; 519 parport_epilogue(pp); 520 } 521 522 static unsigned char parport_mos7715_read_control(struct parport *pp) 523 { 524 struct mos7715_parport *mos_parport = pp->private_data; 525 __u8 dcr; 526 527 spin_lock(&release_lock); 528 mos_parport = pp->private_data; 529 if (unlikely(mos_parport == NULL)) { 530 spin_unlock(&release_lock); 531 return 0; 532 } 533 dcr = mos_parport->shadowDCR & 0x0f; 534 spin_unlock(&release_lock); 535 return dcr; 536 } 537 538 static unsigned char parport_mos7715_frob_control(struct parport *pp, 539 unsigned char mask, 540 unsigned char val) 541 { 542 struct mos7715_parport *mos_parport = pp->private_data; 543 __u8 dcr; 544 545 mask &= 0x0f; 546 val &= 0x0f; 547 if (parport_prologue(pp) < 0) 548 return 0; 549 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 550 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 551 mos_parport->shadowDCR); 552 dcr = mos_parport->shadowDCR & 0x0f; 553 parport_epilogue(pp); 554 return dcr; 555 } 556 557 static unsigned char parport_mos7715_read_status(struct parport *pp) 558 { 559 unsigned char status; 560 struct mos7715_parport *mos_parport = pp->private_data; 561 562 spin_lock(&release_lock); 563 mos_parport = pp->private_data; 564 if (unlikely(mos_parport == NULL)) { /* release called */ 565 spin_unlock(&release_lock); 566 return 0; 567 } 568 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 569 spin_unlock(&release_lock); 570 return status; 571 } 572 573 static void parport_mos7715_enable_irq(struct parport *pp) 574 { 575 } 576 577 static void parport_mos7715_disable_irq(struct parport *pp) 578 { 579 } 580 581 static void parport_mos7715_data_forward(struct parport *pp) 582 { 583 struct mos7715_parport *mos_parport = pp->private_data; 584 585 if (parport_prologue(pp) < 0) 586 return; 587 mos7715_change_mode(mos_parport, PS2); 588 mos_parport->shadowDCR &= ~0x20; 589 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 590 mos_parport->shadowDCR); 591 parport_epilogue(pp); 592 } 593 594 static void parport_mos7715_data_reverse(struct parport *pp) 595 { 596 struct mos7715_parport *mos_parport = pp->private_data; 597 598 if (parport_prologue(pp) < 0) 599 return; 600 mos7715_change_mode(mos_parport, PS2); 601 mos_parport->shadowDCR |= 0x20; 602 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 603 mos_parport->shadowDCR); 604 parport_epilogue(pp); 605 } 606 607 static void parport_mos7715_init_state(struct pardevice *dev, 608 struct parport_state *s) 609 { 610 s->u.pc.ctr = DCR_INIT_VAL; 611 s->u.pc.ecr = ECR_INIT_VAL; 612 } 613 614 /* N.B. Parport core code requires that this function not block */ 615 static void parport_mos7715_save_state(struct parport *pp, 616 struct parport_state *s) 617 { 618 struct mos7715_parport *mos_parport; 619 620 spin_lock(&release_lock); 621 mos_parport = pp->private_data; 622 if (unlikely(mos_parport == NULL)) { /* release called */ 623 spin_unlock(&release_lock); 624 return; 625 } 626 s->u.pc.ctr = mos_parport->shadowDCR; 627 s->u.pc.ecr = mos_parport->shadowECR; 628 spin_unlock(&release_lock); 629 } 630 631 /* N.B. Parport core code requires that this function not block */ 632 static void parport_mos7715_restore_state(struct parport *pp, 633 struct parport_state *s) 634 { 635 struct mos7715_parport *mos_parport; 636 637 spin_lock(&release_lock); 638 mos_parport = pp->private_data; 639 if (unlikely(mos_parport == NULL)) { /* release called */ 640 spin_unlock(&release_lock); 641 return; 642 } 643 write_parport_reg_nonblock(mos_parport, MOS7720_DCR, 644 mos_parport->shadowDCR); 645 write_parport_reg_nonblock(mos_parport, MOS7720_ECR, 646 mos_parport->shadowECR); 647 spin_unlock(&release_lock); 648 } 649 650 static size_t parport_mos7715_write_compat(struct parport *pp, 651 const void *buffer, 652 size_t len, int flags) 653 { 654 int retval; 655 struct mos7715_parport *mos_parport = pp->private_data; 656 int actual_len; 657 658 if (parport_prologue(pp) < 0) 659 return 0; 660 mos7715_change_mode(mos_parport, PPF); 661 retval = usb_bulk_msg(mos_parport->serial->dev, 662 usb_sndbulkpipe(mos_parport->serial->dev, 2), 663 (void *)buffer, len, &actual_len, 664 MOS_WDR_TIMEOUT); 665 parport_epilogue(pp); 666 if (retval) { 667 dev_err(&mos_parport->serial->dev->dev, 668 "mos7720: usb_bulk_msg() failed: %d\n", retval); 669 return 0; 670 } 671 return actual_len; 672 } 673 674 static struct parport_operations parport_mos7715_ops = { 675 .owner = THIS_MODULE, 676 .write_data = parport_mos7715_write_data, 677 .read_data = parport_mos7715_read_data, 678 679 .write_control = parport_mos7715_write_control, 680 .read_control = parport_mos7715_read_control, 681 .frob_control = parport_mos7715_frob_control, 682 683 .read_status = parport_mos7715_read_status, 684 685 .enable_irq = parport_mos7715_enable_irq, 686 .disable_irq = parport_mos7715_disable_irq, 687 688 .data_forward = parport_mos7715_data_forward, 689 .data_reverse = parport_mos7715_data_reverse, 690 691 .init_state = parport_mos7715_init_state, 692 .save_state = parport_mos7715_save_state, 693 .restore_state = parport_mos7715_restore_state, 694 695 .compat_write_data = parport_mos7715_write_compat, 696 697 .nibble_read_data = parport_ieee1284_read_nibble, 698 .byte_read_data = parport_ieee1284_read_byte, 699 }; 700 701 /* 702 * Allocate and initialize parallel port control struct, initialize 703 * the parallel port hardware device, and register with the parport subsystem. 704 */ 705 static int mos7715_parport_init(struct usb_serial *serial) 706 { 707 struct mos7715_parport *mos_parport; 708 709 /* allocate and initialize parallel port control struct */ 710 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 711 if (!mos_parport) 712 return -ENOMEM; 713 714 mos_parport->msg_pending = false; 715 kref_init(&mos_parport->ref_count); 716 spin_lock_init(&mos_parport->listlock); 717 INIT_LIST_HEAD(&mos_parport->active_urbs); 718 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 719 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 720 mos_parport->serial = serial; 721 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 722 (unsigned long) mos_parport); 723 init_completion(&mos_parport->syncmsg_compl); 724 725 /* cycle parallel port reset bit */ 726 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80); 727 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00); 728 729 /* initialize device registers */ 730 mos_parport->shadowDCR = DCR_INIT_VAL; 731 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 732 mos_parport->shadowDCR); 733 mos_parport->shadowECR = ECR_INIT_VAL; 734 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 735 mos_parport->shadowECR); 736 737 /* register with parport core */ 738 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 739 PARPORT_DMA_NONE, 740 &parport_mos7715_ops); 741 if (mos_parport->pp == NULL) { 742 dev_err(&serial->interface->dev, 743 "Could not register parport\n"); 744 kref_put(&mos_parport->ref_count, destroy_mos_parport); 745 return -EIO; 746 } 747 mos_parport->pp->private_data = mos_parport; 748 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 749 mos_parport->pp->dev = &serial->interface->dev; 750 parport_announce_port(mos_parport->pp); 751 752 return 0; 753 } 754 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 755 756 /* 757 * mos7720_interrupt_callback 758 * this is the callback function for when we have received data on the 759 * interrupt endpoint. 760 */ 761 static void mos7720_interrupt_callback(struct urb *urb) 762 { 763 int result; 764 int length; 765 int status = urb->status; 766 struct device *dev = &urb->dev->dev; 767 __u8 *data; 768 __u8 sp1; 769 __u8 sp2; 770 771 switch (status) { 772 case 0: 773 /* success */ 774 break; 775 case -ECONNRESET: 776 case -ENOENT: 777 case -ESHUTDOWN: 778 /* this urb is terminated, clean up */ 779 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 780 return; 781 default: 782 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 783 goto exit; 784 } 785 786 length = urb->actual_length; 787 data = urb->transfer_buffer; 788 789 /* Moschip get 4 bytes 790 * Byte 1 IIR Port 1 (port.number is 0) 791 * Byte 2 IIR Port 2 (port.number is 1) 792 * Byte 3 -------------- 793 * Byte 4 FIFO status for both */ 794 795 /* the above description is inverted 796 * oneukum 2007-03-14 */ 797 798 if (unlikely(length != 4)) { 799 dev_dbg(dev, "Wrong data !!!\n"); 800 return; 801 } 802 803 sp1 = data[3]; 804 sp2 = data[2]; 805 806 if ((sp1 | sp2) & 0x01) { 807 /* No Interrupt Pending in both the ports */ 808 dev_dbg(dev, "No Interrupt !!!\n"); 809 } else { 810 switch (sp1 & 0x0f) { 811 case SERIAL_IIR_RLS: 812 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 813 break; 814 case SERIAL_IIR_CTI: 815 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 816 break; 817 case SERIAL_IIR_MS: 818 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 819 break; 820 } 821 822 switch (sp2 & 0x0f) { 823 case SERIAL_IIR_RLS: 824 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 825 break; 826 case SERIAL_IIR_CTI: 827 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 828 break; 829 case SERIAL_IIR_MS: 830 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 831 break; 832 } 833 } 834 835 exit: 836 result = usb_submit_urb(urb, GFP_ATOMIC); 837 if (result) 838 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 839 } 840 841 /* 842 * mos7715_interrupt_callback 843 * this is the 7715's callback function for when we have received data on 844 * the interrupt endpoint. 845 */ 846 static void mos7715_interrupt_callback(struct urb *urb) 847 { 848 int result; 849 int length; 850 int status = urb->status; 851 struct device *dev = &urb->dev->dev; 852 __u8 *data; 853 __u8 iir; 854 855 switch (status) { 856 case 0: 857 /* success */ 858 break; 859 case -ECONNRESET: 860 case -ENOENT: 861 case -ESHUTDOWN: 862 case -ENODEV: 863 /* this urb is terminated, clean up */ 864 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 865 return; 866 default: 867 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 868 goto exit; 869 } 870 871 length = urb->actual_length; 872 data = urb->transfer_buffer; 873 874 /* Structure of data from 7715 device: 875 * Byte 1: IIR serial Port 876 * Byte 2: unused 877 * Byte 2: DSR parallel port 878 * Byte 4: FIFO status for both */ 879 880 if (unlikely(length != 4)) { 881 dev_dbg(dev, "Wrong data !!!\n"); 882 return; 883 } 884 885 iir = data[0]; 886 if (!(iir & 0x01)) { /* serial port interrupt pending */ 887 switch (iir & 0x0f) { 888 case SERIAL_IIR_RLS: 889 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n"); 890 break; 891 case SERIAL_IIR_CTI: 892 dev_dbg(dev, "Serial Port: Receiver time out\n"); 893 break; 894 case SERIAL_IIR_MS: 895 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 896 break; 897 } 898 } 899 900 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 901 { /* update local copy of DSR reg */ 902 struct usb_serial_port *port = urb->context; 903 struct mos7715_parport *mos_parport = port->serial->private; 904 if (unlikely(mos_parport == NULL)) 905 return; 906 atomic_set(&mos_parport->shadowDSR, data[2]); 907 } 908 #endif 909 910 exit: 911 result = usb_submit_urb(urb, GFP_ATOMIC); 912 if (result) 913 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 914 } 915 916 /* 917 * mos7720_bulk_in_callback 918 * this is the callback function for when we have received data on the 919 * bulk in endpoint. 920 */ 921 static void mos7720_bulk_in_callback(struct urb *urb) 922 { 923 int retval; 924 unsigned char *data ; 925 struct usb_serial_port *port; 926 int status = urb->status; 927 928 if (status) { 929 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 930 return; 931 } 932 933 port = urb->context; 934 935 dev_dbg(&port->dev, "Entering...%s\n", __func__); 936 937 data = urb->transfer_buffer; 938 939 if (urb->actual_length) { 940 tty_insert_flip_string(&port->port, data, urb->actual_length); 941 tty_flip_buffer_push(&port->port); 942 } 943 944 if (port->read_urb->status != -EINPROGRESS) { 945 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 946 if (retval) 947 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 948 } 949 } 950 951 /* 952 * mos7720_bulk_out_data_callback 953 * this is the callback function for when we have finished sending serial 954 * data on the bulk out endpoint. 955 */ 956 static void mos7720_bulk_out_data_callback(struct urb *urb) 957 { 958 struct moschip_port *mos7720_port; 959 int status = urb->status; 960 961 if (status) { 962 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 963 return; 964 } 965 966 mos7720_port = urb->context; 967 if (!mos7720_port) { 968 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 969 return ; 970 } 971 972 if (mos7720_port->open) 973 tty_port_tty_wakeup(&mos7720_port->port->port); 974 } 975 976 static int mos77xx_calc_num_ports(struct usb_serial *serial) 977 { 978 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 979 if (product == MOSCHIP_DEVICE_ID_7715) 980 return 1; 981 982 return 2; 983 } 984 985 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 986 { 987 struct usb_serial *serial; 988 struct urb *urb; 989 struct moschip_port *mos7720_port; 990 int response; 991 int port_number; 992 __u8 data; 993 int allocated_urbs = 0; 994 int j; 995 996 serial = port->serial; 997 998 mos7720_port = usb_get_serial_port_data(port); 999 if (mos7720_port == NULL) 1000 return -ENODEV; 1001 1002 usb_clear_halt(serial->dev, port->write_urb->pipe); 1003 usb_clear_halt(serial->dev, port->read_urb->pipe); 1004 1005 /* Initialising the write urb pool */ 1006 for (j = 0; j < NUM_URBS; ++j) { 1007 urb = usb_alloc_urb(0, GFP_KERNEL); 1008 mos7720_port->write_urb_pool[j] = urb; 1009 if (!urb) 1010 continue; 1011 1012 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1013 GFP_KERNEL); 1014 if (!urb->transfer_buffer) { 1015 usb_free_urb(mos7720_port->write_urb_pool[j]); 1016 mos7720_port->write_urb_pool[j] = NULL; 1017 continue; 1018 } 1019 allocated_urbs++; 1020 } 1021 1022 if (!allocated_urbs) 1023 return -ENOMEM; 1024 1025 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1026 * 1027 * Register Index 1028 * 0 : MOS7720_THR/MOS7720_RHR 1029 * 1 : MOS7720_IER 1030 * 2 : MOS7720_FCR 1031 * 3 : MOS7720_LCR 1032 * 4 : MOS7720_MCR 1033 * 5 : MOS7720_LSR 1034 * 6 : MOS7720_MSR 1035 * 7 : MOS7720_SPR 1036 * 1037 * 0x08 : SP1/2 Control Reg 1038 */ 1039 port_number = port->port_number; 1040 read_mos_reg(serial, port_number, MOS7720_LSR, &data); 1041 1042 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1043 1044 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02); 1045 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02); 1046 1047 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1048 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1049 1050 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1051 mos7720_port->shadowLCR = 0x03; 1052 write_mos_reg(serial, port_number, MOS7720_LCR, 1053 mos7720_port->shadowLCR); 1054 mos7720_port->shadowMCR = 0x0b; 1055 write_mos_reg(serial, port_number, MOS7720_MCR, 1056 mos7720_port->shadowMCR); 1057 1058 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00); 1059 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data); 1060 data = data | (port->port_number + 1); 1061 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data); 1062 mos7720_port->shadowLCR = 0x83; 1063 write_mos_reg(serial, port_number, MOS7720_LCR, 1064 mos7720_port->shadowLCR); 1065 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c); 1066 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1067 mos7720_port->shadowLCR = 0x03; 1068 write_mos_reg(serial, port_number, MOS7720_LCR, 1069 mos7720_port->shadowLCR); 1070 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1071 1072 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1073 if (response) 1074 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1075 __func__, response); 1076 1077 /* initialize our port settings */ 1078 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1079 1080 /* send a open port command */ 1081 mos7720_port->open = 1; 1082 1083 return 0; 1084 } 1085 1086 /* 1087 * mos7720_chars_in_buffer 1088 * this function is called by the tty driver when it wants to know how many 1089 * bytes of data we currently have outstanding in the port (data that has 1090 * been written, but hasn't made it out the port yet) 1091 * If successful, we return the number of bytes left to be written in the 1092 * system, 1093 * Otherwise we return a negative error number. 1094 */ 1095 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1096 { 1097 struct usb_serial_port *port = tty->driver_data; 1098 int i; 1099 int chars = 0; 1100 struct moschip_port *mos7720_port; 1101 1102 mos7720_port = usb_get_serial_port_data(port); 1103 if (mos7720_port == NULL) 1104 return 0; 1105 1106 for (i = 0; i < NUM_URBS; ++i) { 1107 if (mos7720_port->write_urb_pool[i] && 1108 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1109 chars += URB_TRANSFER_BUFFER_SIZE; 1110 } 1111 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1112 return chars; 1113 } 1114 1115 static void mos7720_close(struct usb_serial_port *port) 1116 { 1117 struct usb_serial *serial; 1118 struct moschip_port *mos7720_port; 1119 int j; 1120 1121 serial = port->serial; 1122 1123 mos7720_port = usb_get_serial_port_data(port); 1124 if (mos7720_port == NULL) 1125 return; 1126 1127 for (j = 0; j < NUM_URBS; ++j) 1128 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1129 1130 /* Freeing Write URBs */ 1131 for (j = 0; j < NUM_URBS; ++j) { 1132 if (mos7720_port->write_urb_pool[j]) { 1133 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1134 usb_free_urb(mos7720_port->write_urb_pool[j]); 1135 } 1136 } 1137 1138 /* While closing port, shutdown all bulk read, write * 1139 * and interrupt read if they exists, otherwise nop */ 1140 usb_kill_urb(port->write_urb); 1141 usb_kill_urb(port->read_urb); 1142 1143 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); 1144 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); 1145 1146 mos7720_port->open = 0; 1147 } 1148 1149 static void mos7720_break(struct tty_struct *tty, int break_state) 1150 { 1151 struct usb_serial_port *port = tty->driver_data; 1152 unsigned char data; 1153 struct usb_serial *serial; 1154 struct moschip_port *mos7720_port; 1155 1156 serial = port->serial; 1157 1158 mos7720_port = usb_get_serial_port_data(port); 1159 if (mos7720_port == NULL) 1160 return; 1161 1162 if (break_state == -1) 1163 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1164 else 1165 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1166 1167 mos7720_port->shadowLCR = data; 1168 write_mos_reg(serial, port->port_number, MOS7720_LCR, 1169 mos7720_port->shadowLCR); 1170 } 1171 1172 /* 1173 * mos7720_write_room 1174 * this function is called by the tty driver when it wants to know how many 1175 * bytes of data we can accept for a specific port. 1176 * If successful, we return the amount of room that we have for this port 1177 * Otherwise we return a negative error number. 1178 */ 1179 static int mos7720_write_room(struct tty_struct *tty) 1180 { 1181 struct usb_serial_port *port = tty->driver_data; 1182 struct moschip_port *mos7720_port; 1183 int room = 0; 1184 int i; 1185 1186 mos7720_port = usb_get_serial_port_data(port); 1187 if (mos7720_port == NULL) 1188 return -ENODEV; 1189 1190 /* FIXME: Locking */ 1191 for (i = 0; i < NUM_URBS; ++i) { 1192 if (mos7720_port->write_urb_pool[i] && 1193 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1194 room += URB_TRANSFER_BUFFER_SIZE; 1195 } 1196 1197 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1198 return room; 1199 } 1200 1201 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1202 const unsigned char *data, int count) 1203 { 1204 int status; 1205 int i; 1206 int bytes_sent = 0; 1207 int transfer_size; 1208 1209 struct moschip_port *mos7720_port; 1210 struct usb_serial *serial; 1211 struct urb *urb; 1212 const unsigned char *current_position = data; 1213 1214 serial = port->serial; 1215 1216 mos7720_port = usb_get_serial_port_data(port); 1217 if (mos7720_port == NULL) 1218 return -ENODEV; 1219 1220 /* try to find a free urb in the list */ 1221 urb = NULL; 1222 1223 for (i = 0; i < NUM_URBS; ++i) { 1224 if (mos7720_port->write_urb_pool[i] && 1225 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1226 urb = mos7720_port->write_urb_pool[i]; 1227 dev_dbg(&port->dev, "URB:%d\n", i); 1228 break; 1229 } 1230 } 1231 1232 if (urb == NULL) { 1233 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1234 goto exit; 1235 } 1236 1237 if (urb->transfer_buffer == NULL) { 1238 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1239 GFP_ATOMIC); 1240 if (!urb->transfer_buffer) 1241 goto exit; 1242 } 1243 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1244 1245 memcpy(urb->transfer_buffer, current_position, transfer_size); 1246 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1247 urb->transfer_buffer); 1248 1249 /* fill urb with data and submit */ 1250 usb_fill_bulk_urb(urb, serial->dev, 1251 usb_sndbulkpipe(serial->dev, 1252 port->bulk_out_endpointAddress), 1253 urb->transfer_buffer, transfer_size, 1254 mos7720_bulk_out_data_callback, mos7720_port); 1255 1256 /* send it down the pipe */ 1257 status = usb_submit_urb(urb, GFP_ATOMIC); 1258 if (status) { 1259 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1260 "with status = %d\n", __func__, status); 1261 bytes_sent = status; 1262 goto exit; 1263 } 1264 bytes_sent = transfer_size; 1265 1266 exit: 1267 return bytes_sent; 1268 } 1269 1270 static void mos7720_throttle(struct tty_struct *tty) 1271 { 1272 struct usb_serial_port *port = tty->driver_data; 1273 struct moschip_port *mos7720_port; 1274 int status; 1275 1276 mos7720_port = usb_get_serial_port_data(port); 1277 1278 if (mos7720_port == NULL) 1279 return; 1280 1281 if (!mos7720_port->open) { 1282 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1283 return; 1284 } 1285 1286 /* if we are implementing XON/XOFF, send the stop character */ 1287 if (I_IXOFF(tty)) { 1288 unsigned char stop_char = STOP_CHAR(tty); 1289 status = mos7720_write(tty, port, &stop_char, 1); 1290 if (status <= 0) 1291 return; 1292 } 1293 1294 /* if we are implementing RTS/CTS, toggle that line */ 1295 if (C_CRTSCTS(tty)) { 1296 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1297 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1298 mos7720_port->shadowMCR); 1299 } 1300 } 1301 1302 static void mos7720_unthrottle(struct tty_struct *tty) 1303 { 1304 struct usb_serial_port *port = tty->driver_data; 1305 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1306 int status; 1307 1308 if (mos7720_port == NULL) 1309 return; 1310 1311 if (!mos7720_port->open) { 1312 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1313 return; 1314 } 1315 1316 /* if we are implementing XON/XOFF, send the start character */ 1317 if (I_IXOFF(tty)) { 1318 unsigned char start_char = START_CHAR(tty); 1319 status = mos7720_write(tty, port, &start_char, 1); 1320 if (status <= 0) 1321 return; 1322 } 1323 1324 /* if we are implementing RTS/CTS, toggle that line */ 1325 if (C_CRTSCTS(tty)) { 1326 mos7720_port->shadowMCR |= UART_MCR_RTS; 1327 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1328 mos7720_port->shadowMCR); 1329 } 1330 } 1331 1332 /* FIXME: this function does not work */ 1333 static int set_higher_rates(struct moschip_port *mos7720_port, 1334 unsigned int baud) 1335 { 1336 struct usb_serial_port *port; 1337 struct usb_serial *serial; 1338 int port_number; 1339 enum mos_regs sp_reg; 1340 if (mos7720_port == NULL) 1341 return -EINVAL; 1342 1343 port = mos7720_port->port; 1344 serial = port->serial; 1345 1346 /*********************************************** 1347 * Init Sequence for higher rates 1348 ***********************************************/ 1349 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1350 port_number = port->port_number; 1351 1352 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1353 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1354 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1355 mos7720_port->shadowMCR = 0x0b; 1356 write_mos_reg(serial, port_number, MOS7720_MCR, 1357 mos7720_port->shadowMCR); 1358 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1359 1360 /*********************************************** 1361 * Set for higher rates * 1362 ***********************************************/ 1363 /* writing baud rate verbatum into uart clock field clearly not right */ 1364 if (port_number == 0) 1365 sp_reg = MOS7720_SP1_REG; 1366 else 1367 sp_reg = MOS7720_SP2_REG; 1368 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1369 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1370 mos7720_port->shadowMCR = 0x2b; 1371 write_mos_reg(serial, port_number, MOS7720_MCR, 1372 mos7720_port->shadowMCR); 1373 1374 /*********************************************** 1375 * Set DLL/DLM 1376 ***********************************************/ 1377 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1378 write_mos_reg(serial, port_number, MOS7720_LCR, 1379 mos7720_port->shadowLCR); 1380 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1381 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1382 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1383 write_mos_reg(serial, port_number, MOS7720_LCR, 1384 mos7720_port->shadowLCR); 1385 1386 return 0; 1387 } 1388 1389 /* baud rate information */ 1390 struct divisor_table_entry { 1391 __u32 baudrate; 1392 __u16 divisor; 1393 }; 1394 1395 /* Define table of divisors for moschip 7720 hardware * 1396 * These assume a 3.6864MHz crystal, the standard /16, and * 1397 * MCR.7 = 0. */ 1398 static struct divisor_table_entry divisor_table[] = { 1399 { 50, 2304}, 1400 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1401 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1402 { 150, 768}, 1403 { 300, 384}, 1404 { 600, 192}, 1405 { 1200, 96}, 1406 { 1800, 64}, 1407 { 2400, 48}, 1408 { 4800, 24}, 1409 { 7200, 16}, 1410 { 9600, 12}, 1411 { 19200, 6}, 1412 { 38400, 3}, 1413 { 57600, 2}, 1414 { 115200, 1}, 1415 }; 1416 1417 /***************************************************************************** 1418 * calc_baud_rate_divisor 1419 * this function calculates the proper baud rate divisor for the specified 1420 * baud rate. 1421 *****************************************************************************/ 1422 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1423 { 1424 int i; 1425 __u16 custom; 1426 __u16 round1; 1427 __u16 round; 1428 1429 1430 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1431 1432 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1433 if (divisor_table[i].baudrate == baudrate) { 1434 *divisor = divisor_table[i].divisor; 1435 return 0; 1436 } 1437 } 1438 1439 /* After trying for all the standard baud rates * 1440 * Try calculating the divisor for this baud rate */ 1441 if (baudrate > 75 && baudrate < 230400) { 1442 /* get the divisor */ 1443 custom = (__u16)(230400L / baudrate); 1444 1445 /* Check for round off */ 1446 round1 = (__u16)(2304000L / baudrate); 1447 round = (__u16)(round1 - (custom * 10)); 1448 if (round > 4) 1449 custom++; 1450 *divisor = custom; 1451 1452 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1453 return 0; 1454 } 1455 1456 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1457 return -EINVAL; 1458 } 1459 1460 /* 1461 * send_cmd_write_baud_rate 1462 * this function sends the proper command to change the baud rate of the 1463 * specified port. 1464 */ 1465 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1466 int baudrate) 1467 { 1468 struct usb_serial_port *port; 1469 struct usb_serial *serial; 1470 int divisor; 1471 int status; 1472 unsigned char number; 1473 1474 if (mos7720_port == NULL) 1475 return -1; 1476 1477 port = mos7720_port->port; 1478 serial = port->serial; 1479 1480 number = port->port_number; 1481 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1482 1483 /* Calculate the Divisor */ 1484 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1485 if (status) { 1486 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1487 return status; 1488 } 1489 1490 /* Enable access to divisor latch */ 1491 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1492 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1493 1494 /* Write the divisor */ 1495 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1496 write_mos_reg(serial, number, MOS7720_DLM, 1497 (__u8)((divisor & 0xff00) >> 8)); 1498 1499 /* Disable access to divisor latch */ 1500 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1501 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1502 1503 return status; 1504 } 1505 1506 /* 1507 * change_port_settings 1508 * This routine is called to set the UART on the device to match 1509 * the specified new settings. 1510 */ 1511 static void change_port_settings(struct tty_struct *tty, 1512 struct moschip_port *mos7720_port, 1513 struct ktermios *old_termios) 1514 { 1515 struct usb_serial_port *port; 1516 struct usb_serial *serial; 1517 int baud; 1518 unsigned cflag; 1519 unsigned iflag; 1520 __u8 mask = 0xff; 1521 __u8 lData; 1522 __u8 lParity; 1523 __u8 lStop; 1524 int status; 1525 int port_number; 1526 1527 if (mos7720_port == NULL) 1528 return ; 1529 1530 port = mos7720_port->port; 1531 serial = port->serial; 1532 port_number = port->port_number; 1533 1534 if (!mos7720_port->open) { 1535 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1536 return; 1537 } 1538 1539 lData = UART_LCR_WLEN8; 1540 lStop = 0x00; /* 1 stop bit */ 1541 lParity = 0x00; /* No parity */ 1542 1543 cflag = tty->termios.c_cflag; 1544 iflag = tty->termios.c_iflag; 1545 1546 /* Change the number of bits */ 1547 switch (cflag & CSIZE) { 1548 case CS5: 1549 lData = UART_LCR_WLEN5; 1550 mask = 0x1f; 1551 break; 1552 1553 case CS6: 1554 lData = UART_LCR_WLEN6; 1555 mask = 0x3f; 1556 break; 1557 1558 case CS7: 1559 lData = UART_LCR_WLEN7; 1560 mask = 0x7f; 1561 break; 1562 default: 1563 case CS8: 1564 lData = UART_LCR_WLEN8; 1565 break; 1566 } 1567 1568 /* Change the Parity bit */ 1569 if (cflag & PARENB) { 1570 if (cflag & PARODD) { 1571 lParity = UART_LCR_PARITY; 1572 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1573 } else { 1574 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1575 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1576 } 1577 1578 } else { 1579 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1580 } 1581 1582 if (cflag & CMSPAR) 1583 lParity = lParity | 0x20; 1584 1585 /* Change the Stop bit */ 1586 if (cflag & CSTOPB) { 1587 lStop = UART_LCR_STOP; 1588 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1589 } else { 1590 lStop = 0x00; 1591 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1592 } 1593 1594 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1595 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1596 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1597 1598 /* Update the LCR with the correct value */ 1599 mos7720_port->shadowLCR &= 1600 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1601 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1602 1603 1604 /* Disable Interrupts */ 1605 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1606 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1607 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1608 1609 /* Send the updated LCR value to the mos7720 */ 1610 write_mos_reg(serial, port_number, MOS7720_LCR, 1611 mos7720_port->shadowLCR); 1612 mos7720_port->shadowMCR = 0x0b; 1613 write_mos_reg(serial, port_number, MOS7720_MCR, 1614 mos7720_port->shadowMCR); 1615 1616 /* set up the MCR register and send it to the mos7720 */ 1617 mos7720_port->shadowMCR = UART_MCR_OUT2; 1618 if (cflag & CBAUD) 1619 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1620 1621 if (cflag & CRTSCTS) { 1622 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1623 /* To set hardware flow control to the specified * 1624 * serial port, in SP1/2_CONTROL_REG */ 1625 if (port_number) 1626 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1627 0x01); 1628 else 1629 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1630 0x02); 1631 1632 } else 1633 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1634 1635 write_mos_reg(serial, port_number, MOS7720_MCR, 1636 mos7720_port->shadowMCR); 1637 1638 /* Determine divisor based on baud rate */ 1639 baud = tty_get_baud_rate(tty); 1640 if (!baud) { 1641 /* pick a default, any default... */ 1642 dev_dbg(&port->dev, "Picked default baud...\n"); 1643 baud = 9600; 1644 } 1645 1646 if (baud >= 230400) { 1647 set_higher_rates(mos7720_port, baud); 1648 /* Enable Interrupts */ 1649 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1650 return; 1651 } 1652 1653 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1654 status = send_cmd_write_baud_rate(mos7720_port, baud); 1655 /* FIXME: needs to write actual resulting baud back not just 1656 blindly do so */ 1657 if (cflag & CBAUD) 1658 tty_encode_baud_rate(tty, baud, baud); 1659 /* Enable Interrupts */ 1660 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1661 1662 if (port->read_urb->status != -EINPROGRESS) { 1663 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1664 if (status) 1665 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1666 } 1667 } 1668 1669 /* 1670 * mos7720_set_termios 1671 * this function is called by the tty driver when it wants to change the 1672 * termios structure. 1673 */ 1674 static void mos7720_set_termios(struct tty_struct *tty, 1675 struct usb_serial_port *port, struct ktermios *old_termios) 1676 { 1677 int status; 1678 unsigned int cflag; 1679 struct usb_serial *serial; 1680 struct moschip_port *mos7720_port; 1681 1682 serial = port->serial; 1683 1684 mos7720_port = usb_get_serial_port_data(port); 1685 1686 if (mos7720_port == NULL) 1687 return; 1688 1689 if (!mos7720_port->open) { 1690 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1691 return; 1692 } 1693 1694 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1695 1696 cflag = tty->termios.c_cflag; 1697 1698 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1699 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1700 1701 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1702 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1703 1704 /* change the port settings to the new ones specified */ 1705 change_port_settings(tty, mos7720_port, old_termios); 1706 1707 if (port->read_urb->status != -EINPROGRESS) { 1708 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1709 if (status) 1710 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1711 } 1712 } 1713 1714 /* 1715 * get_lsr_info - get line status register info 1716 * 1717 * Purpose: Let user call ioctl() to get info when the UART physically 1718 * is emptied. On bus types like RS485, the transmitter must 1719 * release the bus after transmitting. This must be done when 1720 * the transmit shift register is empty, not be done when the 1721 * transmit holding register is empty. This functionality 1722 * allows an RS485 driver to be written in user space. 1723 */ 1724 static int get_lsr_info(struct tty_struct *tty, 1725 struct moschip_port *mos7720_port, unsigned int __user *value) 1726 { 1727 struct usb_serial_port *port = tty->driver_data; 1728 unsigned int result = 0; 1729 unsigned char data = 0; 1730 int port_number = port->port_number; 1731 int count; 1732 1733 count = mos7720_chars_in_buffer(tty); 1734 if (count == 0) { 1735 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1736 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1737 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1738 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1739 result = TIOCSER_TEMT; 1740 } 1741 } 1742 if (copy_to_user(value, &result, sizeof(int))) 1743 return -EFAULT; 1744 return 0; 1745 } 1746 1747 static int mos7720_tiocmget(struct tty_struct *tty) 1748 { 1749 struct usb_serial_port *port = tty->driver_data; 1750 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1751 unsigned int result = 0; 1752 unsigned int mcr ; 1753 unsigned int msr ; 1754 1755 mcr = mos7720_port->shadowMCR; 1756 msr = mos7720_port->shadowMSR; 1757 1758 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1759 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1760 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1761 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1762 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1763 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1764 1765 return result; 1766 } 1767 1768 static int mos7720_tiocmset(struct tty_struct *tty, 1769 unsigned int set, unsigned int clear) 1770 { 1771 struct usb_serial_port *port = tty->driver_data; 1772 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1773 unsigned int mcr ; 1774 1775 mcr = mos7720_port->shadowMCR; 1776 1777 if (set & TIOCM_RTS) 1778 mcr |= UART_MCR_RTS; 1779 if (set & TIOCM_DTR) 1780 mcr |= UART_MCR_DTR; 1781 if (set & TIOCM_LOOP) 1782 mcr |= UART_MCR_LOOP; 1783 1784 if (clear & TIOCM_RTS) 1785 mcr &= ~UART_MCR_RTS; 1786 if (clear & TIOCM_DTR) 1787 mcr &= ~UART_MCR_DTR; 1788 if (clear & TIOCM_LOOP) 1789 mcr &= ~UART_MCR_LOOP; 1790 1791 mos7720_port->shadowMCR = mcr; 1792 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1793 mos7720_port->shadowMCR); 1794 1795 return 0; 1796 } 1797 1798 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1799 unsigned int __user *value) 1800 { 1801 unsigned int mcr; 1802 unsigned int arg; 1803 1804 struct usb_serial_port *port; 1805 1806 if (mos7720_port == NULL) 1807 return -1; 1808 1809 port = (struct usb_serial_port *)mos7720_port->port; 1810 mcr = mos7720_port->shadowMCR; 1811 1812 if (copy_from_user(&arg, value, sizeof(int))) 1813 return -EFAULT; 1814 1815 switch (cmd) { 1816 case TIOCMBIS: 1817 if (arg & TIOCM_RTS) 1818 mcr |= UART_MCR_RTS; 1819 if (arg & TIOCM_DTR) 1820 mcr |= UART_MCR_RTS; 1821 if (arg & TIOCM_LOOP) 1822 mcr |= UART_MCR_LOOP; 1823 break; 1824 1825 case TIOCMBIC: 1826 if (arg & TIOCM_RTS) 1827 mcr &= ~UART_MCR_RTS; 1828 if (arg & TIOCM_DTR) 1829 mcr &= ~UART_MCR_RTS; 1830 if (arg & TIOCM_LOOP) 1831 mcr &= ~UART_MCR_LOOP; 1832 break; 1833 1834 } 1835 1836 mos7720_port->shadowMCR = mcr; 1837 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1838 mos7720_port->shadowMCR); 1839 1840 return 0; 1841 } 1842 1843 static int get_serial_info(struct moschip_port *mos7720_port, 1844 struct serial_struct __user *retinfo) 1845 { 1846 struct serial_struct tmp; 1847 1848 memset(&tmp, 0, sizeof(tmp)); 1849 1850 tmp.type = PORT_16550A; 1851 tmp.line = mos7720_port->port->minor; 1852 tmp.port = mos7720_port->port->port_number; 1853 tmp.irq = 0; 1854 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1855 tmp.baud_base = 9600; 1856 tmp.close_delay = 5*HZ; 1857 tmp.closing_wait = 30*HZ; 1858 1859 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1860 return -EFAULT; 1861 return 0; 1862 } 1863 1864 static int mos7720_ioctl(struct tty_struct *tty, 1865 unsigned int cmd, unsigned long arg) 1866 { 1867 struct usb_serial_port *port = tty->driver_data; 1868 struct moschip_port *mos7720_port; 1869 1870 mos7720_port = usb_get_serial_port_data(port); 1871 if (mos7720_port == NULL) 1872 return -ENODEV; 1873 1874 switch (cmd) { 1875 case TIOCSERGETLSR: 1876 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1877 return get_lsr_info(tty, mos7720_port, 1878 (unsigned int __user *)arg); 1879 1880 /* FIXME: These should be using the mode methods */ 1881 case TIOCMBIS: 1882 case TIOCMBIC: 1883 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1884 return set_modem_info(mos7720_port, cmd, 1885 (unsigned int __user *)arg); 1886 1887 case TIOCGSERIAL: 1888 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1889 return get_serial_info(mos7720_port, 1890 (struct serial_struct __user *)arg); 1891 } 1892 1893 return -ENOIOCTLCMD; 1894 } 1895 1896 static int mos7720_startup(struct usb_serial *serial) 1897 { 1898 struct usb_device *dev; 1899 char data; 1900 u16 product; 1901 int ret_val; 1902 1903 if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) { 1904 dev_err(&serial->interface->dev, "missing bulk endpoints\n"); 1905 return -ENODEV; 1906 } 1907 1908 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1909 dev = serial->dev; 1910 1911 /* 1912 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1913 * port, and the second for the serial port. Because the usbserial core 1914 * assumes both pairs are serial ports, we must engage in a bit of 1915 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1916 * port 0 point to the serial port. However, both moschip devices use a 1917 * single interrupt-in endpoint for both ports (as mentioned a little 1918 * further down), and this endpoint was assigned to port 0. So after 1919 * the swap, we must copy the interrupt endpoint elements from port 1 1920 * (as newly assigned) to port 0, and null out port 1 pointers. 1921 */ 1922 if (product == MOSCHIP_DEVICE_ID_7715) { 1923 struct usb_serial_port *tmp = serial->port[0]; 1924 serial->port[0] = serial->port[1]; 1925 serial->port[1] = tmp; 1926 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1927 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1928 serial->port[0]->interrupt_in_endpointAddress = 1929 tmp->interrupt_in_endpointAddress; 1930 serial->port[1]->interrupt_in_urb = NULL; 1931 serial->port[1]->interrupt_in_buffer = NULL; 1932 1933 if (serial->port[0]->interrupt_in_urb) { 1934 struct urb *urb = serial->port[0]->interrupt_in_urb; 1935 1936 urb->complete = mos7715_interrupt_callback; 1937 } 1938 } 1939 1940 /* setting configuration feature to one */ 1941 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1942 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1943 1944 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1945 if (product == MOSCHIP_DEVICE_ID_7715) { 1946 ret_val = mos7715_parport_init(serial); 1947 if (ret_val < 0) 1948 return ret_val; 1949 } 1950 #endif 1951 /* start the interrupt urb */ 1952 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1953 if (ret_val) { 1954 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", 1955 ret_val); 1956 } 1957 1958 /* LSR For Port 1 */ 1959 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1960 dev_dbg(&dev->dev, "LSR:%x\n", data); 1961 1962 return 0; 1963 } 1964 1965 static void mos7720_release(struct usb_serial *serial) 1966 { 1967 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1968 1969 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1970 /* close the parallel port */ 1971 1972 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1973 == MOSCHIP_DEVICE_ID_7715) { 1974 struct urbtracker *urbtrack; 1975 unsigned long flags; 1976 struct mos7715_parport *mos_parport = 1977 usb_get_serial_data(serial); 1978 1979 /* prevent NULL ptr dereference in port callbacks */ 1980 spin_lock(&release_lock); 1981 mos_parport->pp->private_data = NULL; 1982 spin_unlock(&release_lock); 1983 1984 /* wait for synchronous usb calls to return */ 1985 if (mos_parport->msg_pending) 1986 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1987 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1988 1989 parport_remove_port(mos_parport->pp); 1990 usb_set_serial_data(serial, NULL); 1991 mos_parport->serial = NULL; 1992 1993 /* if tasklet currently scheduled, wait for it to complete */ 1994 tasklet_kill(&mos_parport->urb_tasklet); 1995 1996 /* unlink any urbs sent by the tasklet */ 1997 spin_lock_irqsave(&mos_parport->listlock, flags); 1998 list_for_each_entry(urbtrack, 1999 &mos_parport->active_urbs, 2000 urblist_entry) 2001 usb_unlink_urb(urbtrack->urb); 2002 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2003 parport_del_port(mos_parport->pp); 2004 2005 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2006 } 2007 #endif 2008 } 2009 2010 static int mos7720_port_probe(struct usb_serial_port *port) 2011 { 2012 struct moschip_port *mos7720_port; 2013 2014 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2015 if (!mos7720_port) 2016 return -ENOMEM; 2017 2018 mos7720_port->port = port; 2019 2020 usb_set_serial_port_data(port, mos7720_port); 2021 2022 return 0; 2023 } 2024 2025 static int mos7720_port_remove(struct usb_serial_port *port) 2026 { 2027 struct moschip_port *mos7720_port; 2028 2029 mos7720_port = usb_get_serial_port_data(port); 2030 kfree(mos7720_port); 2031 2032 return 0; 2033 } 2034 2035 static struct usb_serial_driver moschip7720_2port_driver = { 2036 .driver = { 2037 .owner = THIS_MODULE, 2038 .name = "moschip7720", 2039 }, 2040 .description = "Moschip 2 port adapter", 2041 .id_table = id_table, 2042 .calc_num_ports = mos77xx_calc_num_ports, 2043 .open = mos7720_open, 2044 .close = mos7720_close, 2045 .throttle = mos7720_throttle, 2046 .unthrottle = mos7720_unthrottle, 2047 .attach = mos7720_startup, 2048 .release = mos7720_release, 2049 .port_probe = mos7720_port_probe, 2050 .port_remove = mos7720_port_remove, 2051 .ioctl = mos7720_ioctl, 2052 .tiocmget = mos7720_tiocmget, 2053 .tiocmset = mos7720_tiocmset, 2054 .set_termios = mos7720_set_termios, 2055 .write = mos7720_write, 2056 .write_room = mos7720_write_room, 2057 .chars_in_buffer = mos7720_chars_in_buffer, 2058 .break_ctl = mos7720_break, 2059 .read_bulk_callback = mos7720_bulk_in_callback, 2060 .read_int_callback = mos7720_interrupt_callback, 2061 }; 2062 2063 static struct usb_serial_driver * const serial_drivers[] = { 2064 &moschip7720_2port_driver, NULL 2065 }; 2066 2067 module_usb_serial_driver(serial_drivers, id_table); 2068 2069 MODULE_AUTHOR(DRIVER_AUTHOR); 2070 MODULE_DESCRIPTION(DRIVER_DESC); 2071 MODULE_LICENSE("GPL"); 2072