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