1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial convertor 4 * 5 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, version 2 of the License. 10 * 11 * Developed by: 12 * Vijaya Kumar <vijaykumar.gn@gmail.com> 13 * Ajay Kumar <naanuajay@yahoo.com> 14 * Gurudeva <ngurudeva@yahoo.com> 15 * 16 * Cleaned up from the original by: 17 * Greg Kroah-Hartman <gregkh@suse.de> 18 * 19 * Originally based on drivers/usb/serial/io_edgeport.c which is: 20 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 22 */ 23 #include <linux/kernel.h> 24 #include <linux/errno.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/tty.h> 28 #include <linux/tty_driver.h> 29 #include <linux/tty_flip.h> 30 #include <linux/module.h> 31 #include <linux/spinlock.h> 32 #include <linux/serial.h> 33 #include <linux/serial_reg.h> 34 #include <linux/usb.h> 35 #include <linux/usb/serial.h> 36 #include <linux/uaccess.h> 37 #include <linux/parport.h> 38 39 /* 40 * Version Information 41 */ 42 #define DRIVER_VERSION "2.1" 43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 44 #define DRIVER_DESC "Moschip USB Serial Driver" 45 46 /* default urb timeout */ 47 #define MOS_WDR_TIMEOUT (HZ * 5) 48 49 #define MOS_MAX_PORT 0x02 50 #define MOS_WRITE 0x0E 51 #define MOS_READ 0x0D 52 53 /* Interrupt Rotinue Defines */ 54 #define SERIAL_IIR_RLS 0x06 55 #define SERIAL_IIR_RDA 0x04 56 #define SERIAL_IIR_CTI 0x0c 57 #define SERIAL_IIR_THR 0x02 58 #define SERIAL_IIR_MS 0x00 59 60 #define NUM_URBS 16 /* URB Count */ 61 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 62 63 /* This structure holds all of the local serial port information */ 64 struct moschip_port { 65 __u8 shadowLCR; /* last LCR value received */ 66 __u8 shadowMCR; /* last MCR value received */ 67 __u8 shadowMSR; /* last MSR value received */ 68 char open; 69 struct async_icount icount; 70 struct usb_serial_port *port; /* loop back to the owner */ 71 struct urb *write_urb_pool[NUM_URBS]; 72 }; 73 74 static int debug; 75 76 static struct usb_serial_driver moschip7720_2port_driver; 77 78 #define USB_VENDOR_ID_MOSCHIP 0x9710 79 #define MOSCHIP_DEVICE_ID_7720 0x7720 80 #define MOSCHIP_DEVICE_ID_7715 0x7715 81 82 static const struct usb_device_id moschip_port_id_table[] = { 83 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 84 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 85 { } /* terminating entry */ 86 }; 87 MODULE_DEVICE_TABLE(usb, moschip_port_id_table); 88 89 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 90 91 /* initial values for parport regs */ 92 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 93 #define ECR_INIT_VAL 0x00 /* SPP mode */ 94 95 struct urbtracker { 96 struct mos7715_parport *mos_parport; 97 struct list_head urblist_entry; 98 struct kref ref_count; 99 struct urb *urb; 100 }; 101 102 enum mos7715_pp_modes { 103 SPP = 0<<5, 104 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 105 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 106 }; 107 108 struct mos7715_parport { 109 struct parport *pp; /* back to containing struct */ 110 struct kref ref_count; /* to instance of this struct */ 111 struct list_head deferred_urbs; /* list deferred async urbs */ 112 struct list_head active_urbs; /* list async urbs in flight */ 113 spinlock_t listlock; /* protects list access */ 114 bool msg_pending; /* usb sync call pending */ 115 struct completion syncmsg_compl; /* usb sync call completed */ 116 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 117 struct usb_serial *serial; /* back to containing struct */ 118 __u8 shadowECR; /* parallel port regs... */ 119 __u8 shadowDCR; 120 atomic_t shadowDSR; /* updated in int-in callback */ 121 }; 122 123 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 124 static DEFINE_SPINLOCK(release_lock); 125 126 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 127 128 static const unsigned int dummy; /* for clarity in register access fns */ 129 130 enum mos_regs { 131 THR, /* serial port regs */ 132 RHR, 133 IER, 134 FCR, 135 ISR, 136 LCR, 137 MCR, 138 LSR, 139 MSR, 140 SPR, 141 DLL, 142 DLM, 143 DPR, /* parallel port regs */ 144 DSR, 145 DCR, 146 ECR, 147 SP1_REG, /* device control regs */ 148 SP2_REG, /* serial port 2 (7720 only) */ 149 PP_REG, 150 SP_CONTROL_REG, 151 }; 152 153 /* 154 * Return the correct value for the Windex field of the setup packet 155 * for a control endpoint message. See the 7715 datasheet. 156 */ 157 static inline __u16 get_reg_index(enum mos_regs reg) 158 { 159 static const __u16 mos7715_index_lookup_table[] = { 160 0x00, /* THR */ 161 0x00, /* RHR */ 162 0x01, /* IER */ 163 0x02, /* FCR */ 164 0x02, /* ISR */ 165 0x03, /* LCR */ 166 0x04, /* MCR */ 167 0x05, /* LSR */ 168 0x06, /* MSR */ 169 0x07, /* SPR */ 170 0x00, /* DLL */ 171 0x01, /* DLM */ 172 0x00, /* DPR */ 173 0x01, /* DSR */ 174 0x02, /* DCR */ 175 0x0a, /* ECR */ 176 0x01, /* SP1_REG */ 177 0x02, /* SP2_REG (7720 only) */ 178 0x04, /* PP_REG (7715 only) */ 179 0x08, /* SP_CONTROL_REG */ 180 }; 181 return mos7715_index_lookup_table[reg]; 182 } 183 184 /* 185 * Return the correct value for the upper byte of the Wvalue field of 186 * the setup packet for a control endpoint message. 187 */ 188 static inline __u16 get_reg_value(enum mos_regs reg, 189 unsigned int serial_portnum) 190 { 191 if (reg >= SP1_REG) /* control reg */ 192 return 0x0000; 193 194 else if (reg >= DPR) /* parallel port reg (7715 only) */ 195 return 0x0100; 196 197 else /* serial port reg */ 198 return (serial_portnum + 2) << 8; 199 } 200 201 /* 202 * Write data byte to the specified device register. The data is embedded in 203 * the value field of the setup packet. serial_portnum is ignored for registers 204 * not specific to a particular serial port. 205 */ 206 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 207 enum mos_regs reg, __u8 data) 208 { 209 struct usb_device *usbdev = serial->dev; 210 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 211 __u8 request = (__u8)0x0e; 212 __u8 requesttype = (__u8)0x40; 213 __u16 index = get_reg_index(reg); 214 __u16 value = get_reg_value(reg, serial_portnum) + data; 215 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 216 index, NULL, 0, MOS_WDR_TIMEOUT); 217 if (status < 0) 218 dev_err(&usbdev->dev, 219 "mos7720: usb_control_msg() failed: %d", status); 220 return status; 221 } 222 223 /* 224 * Read data byte from the specified device register. The data returned by the 225 * device is embedded in the value field of the setup packet. serial_portnum is 226 * ignored for registers that are not specific to a particular serial port. 227 */ 228 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 229 enum mos_regs reg, __u8 *data) 230 { 231 struct usb_device *usbdev = serial->dev; 232 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 233 __u8 request = (__u8)0x0d; 234 __u8 requesttype = (__u8)0xc0; 235 __u16 index = get_reg_index(reg); 236 __u16 value = get_reg_value(reg, serial_portnum); 237 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 238 index, data, 1, MOS_WDR_TIMEOUT); 239 if (status < 0) 240 dev_err(&usbdev->dev, 241 "mos7720: usb_control_msg() failed: %d", status); 242 return status; 243 } 244 245 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 246 247 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 248 enum mos7715_pp_modes mode) 249 { 250 mos_parport->shadowECR = mode; 251 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 252 return 0; 253 } 254 255 static void destroy_mos_parport(struct kref *kref) 256 { 257 struct mos7715_parport *mos_parport = 258 container_of(kref, struct mos7715_parport, ref_count); 259 260 dbg("%s called", __func__); 261 kfree(mos_parport); 262 } 263 264 static void destroy_urbtracker(struct kref *kref) 265 { 266 struct urbtracker *urbtrack = 267 container_of(kref, struct urbtracker, ref_count); 268 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 269 dbg("%s called", __func__); 270 usb_free_urb(urbtrack->urb); 271 kfree(urbtrack); 272 kref_put(&mos_parport->ref_count, destroy_mos_parport); 273 } 274 275 /* 276 * This runs as a tasklet when sending an urb in a non-blocking parallel 277 * port callback had to be deferred because the disconnect mutex could not be 278 * obtained at the time. 279 */ 280 static void send_deferred_urbs(unsigned long _mos_parport) 281 { 282 int ret_val; 283 unsigned long flags; 284 struct mos7715_parport *mos_parport = (void *)_mos_parport; 285 struct urbtracker *urbtrack; 286 struct list_head *cursor, *next; 287 288 dbg("%s called", __func__); 289 290 /* if release function ran, game over */ 291 if (unlikely(mos_parport->serial == NULL)) 292 return; 293 294 /* try again to get the mutex */ 295 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 296 dbg("%s: rescheduling tasklet", __func__); 297 tasklet_schedule(&mos_parport->urb_tasklet); 298 return; 299 } 300 301 /* if device disconnected, game over */ 302 if (unlikely(mos_parport->serial->disconnected)) { 303 mutex_unlock(&mos_parport->serial->disc_mutex); 304 return; 305 } 306 307 spin_lock_irqsave(&mos_parport->listlock, flags); 308 if (list_empty(&mos_parport->deferred_urbs)) { 309 spin_unlock_irqrestore(&mos_parport->listlock, flags); 310 mutex_unlock(&mos_parport->serial->disc_mutex); 311 dbg("%s: deferred_urbs list empty", __func__); 312 return; 313 } 314 315 /* move contents of deferred_urbs list to active_urbs list and submit */ 316 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 317 list_move_tail(cursor, &mos_parport->active_urbs); 318 list_for_each_entry(urbtrack, &mos_parport->active_urbs, 319 urblist_entry) { 320 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 321 dbg("%s: urb submitted", __func__); 322 if (ret_val) { 323 dev_err(&mos_parport->serial->dev->dev, 324 "usb_submit_urb() failed: %d", ret_val); 325 list_del(&urbtrack->urblist_entry); 326 kref_put(&urbtrack->ref_count, destroy_urbtracker); 327 } 328 } 329 spin_unlock_irqrestore(&mos_parport->listlock, flags); 330 mutex_unlock(&mos_parport->serial->disc_mutex); 331 } 332 333 /* callback for parallel port control urbs submitted asynchronously */ 334 static void async_complete(struct urb *urb) 335 { 336 struct urbtracker *urbtrack = urb->context; 337 int status = urb->status; 338 dbg("%s called", __func__); 339 if (unlikely(status)) 340 dbg("%s - nonzero urb status received: %d", __func__, status); 341 342 /* remove the urbtracker from the active_urbs list */ 343 spin_lock(&urbtrack->mos_parport->listlock); 344 list_del(&urbtrack->urblist_entry); 345 spin_unlock(&urbtrack->mos_parport->listlock); 346 kref_put(&urbtrack->ref_count, destroy_urbtracker); 347 } 348 349 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 350 enum mos_regs reg, __u8 data) 351 { 352 struct urbtracker *urbtrack; 353 int ret_val; 354 unsigned long flags; 355 struct usb_ctrlrequest setup; 356 struct usb_serial *serial = mos_parport->serial; 357 struct usb_device *usbdev = serial->dev; 358 dbg("%s called", __func__); 359 360 /* create and initialize the control urb and containing urbtracker */ 361 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 362 if (urbtrack == NULL) { 363 dev_err(&usbdev->dev, "out of memory"); 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 == NULL) { 370 dev_err(&usbdev->dev, "out of urbs"); 371 kfree(urbtrack); 372 return -ENOMEM; 373 } 374 setup.bRequestType = (__u8)0x40; 375 setup.bRequest = (__u8)0x0e; 376 setup.wValue = get_reg_value(reg, dummy); 377 setup.wIndex = get_reg_index(reg); 378 setup.wLength = 0; 379 usb_fill_control_urb(urbtrack->urb, usbdev, 380 usb_sndctrlpipe(usbdev, 0), 381 (unsigned char *)&setup, 382 NULL, 0, async_complete, urbtrack); 383 kref_init(&urbtrack->ref_count); 384 INIT_LIST_HEAD(&urbtrack->urblist_entry); 385 386 /* 387 * get the disconnect mutex, or add tracker to the deferred_urbs list 388 * and schedule a tasklet to try again later 389 */ 390 if (!mutex_trylock(&serial->disc_mutex)) { 391 spin_lock_irqsave(&mos_parport->listlock, flags); 392 list_add_tail(&urbtrack->urblist_entry, 393 &mos_parport->deferred_urbs); 394 spin_unlock_irqrestore(&mos_parport->listlock, flags); 395 tasklet_schedule(&mos_parport->urb_tasklet); 396 dbg("tasklet scheduled"); 397 return 0; 398 } 399 400 /* bail if device disconnected */ 401 if (serial->disconnected) { 402 kref_put(&urbtrack->ref_count, destroy_urbtracker); 403 mutex_unlock(&serial->disc_mutex); 404 return -ENODEV; 405 } 406 407 /* add the tracker to the active_urbs list and submit */ 408 spin_lock_irqsave(&mos_parport->listlock, flags); 409 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 410 spin_unlock_irqrestore(&mos_parport->listlock, flags); 411 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 412 mutex_unlock(&serial->disc_mutex); 413 if (ret_val) { 414 dev_err(&usbdev->dev, 415 "%s: submit_urb() failed: %d", __func__, ret_val); 416 spin_lock_irqsave(&mos_parport->listlock, flags); 417 list_del(&urbtrack->urblist_entry); 418 spin_unlock_irqrestore(&mos_parport->listlock, flags); 419 kref_put(&urbtrack->ref_count, destroy_urbtracker); 420 return ret_val; 421 } 422 return 0; 423 } 424 425 /* 426 * This is the the common top part of all parallel port callback operations that 427 * send synchronous messages to the device. This implements convoluted locking 428 * that avoids two scenarios: (1) a port operation is called after usbserial 429 * has called our release function, at which point struct mos7715_parport has 430 * been destroyed, and (2) the device has been disconnected, but usbserial has 431 * not called the release function yet because someone has a serial port open. 432 * The shared release_lock prevents the first, and the mutex and disconnected 433 * flag maintained by usbserial covers the second. We also use the msg_pending 434 * flag to ensure that all synchronous usb messgage calls have completed before 435 * our release function can return. 436 */ 437 static int parport_prologue(struct parport *pp) 438 { 439 struct mos7715_parport *mos_parport; 440 441 spin_lock(&release_lock); 442 mos_parport = pp->private_data; 443 if (unlikely(mos_parport == NULL)) { 444 /* release fn called, port struct destroyed */ 445 spin_unlock(&release_lock); 446 return -1; 447 } 448 mos_parport->msg_pending = true; /* synch usb call pending */ 449 INIT_COMPLETION(mos_parport->syncmsg_compl); 450 spin_unlock(&release_lock); 451 452 mutex_lock(&mos_parport->serial->disc_mutex); 453 if (mos_parport->serial->disconnected) { 454 /* device disconnected */ 455 mutex_unlock(&mos_parport->serial->disc_mutex); 456 mos_parport->msg_pending = false; 457 complete(&mos_parport->syncmsg_compl); 458 return -1; 459 } 460 461 return 0; 462 } 463 464 /* 465 * This is the the common bottom part of all parallel port functions that send 466 * synchronous messages to the device. 467 */ 468 static inline void parport_epilogue(struct parport *pp) 469 { 470 struct mos7715_parport *mos_parport = pp->private_data; 471 mutex_unlock(&mos_parport->serial->disc_mutex); 472 mos_parport->msg_pending = false; 473 complete(&mos_parport->syncmsg_compl); 474 } 475 476 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 477 { 478 struct mos7715_parport *mos_parport = pp->private_data; 479 dbg("%s called: %2.2x", __func__, d); 480 if (parport_prologue(pp) < 0) 481 return; 482 mos7715_change_mode(mos_parport, SPP); 483 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d); 484 parport_epilogue(pp); 485 } 486 487 static unsigned char parport_mos7715_read_data(struct parport *pp) 488 { 489 struct mos7715_parport *mos_parport = pp->private_data; 490 unsigned char d; 491 dbg("%s called", __func__); 492 if (parport_prologue(pp) < 0) 493 return 0; 494 read_mos_reg(mos_parport->serial, dummy, DPR, &d); 495 parport_epilogue(pp); 496 return d; 497 } 498 499 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 500 { 501 struct mos7715_parport *mos_parport = pp->private_data; 502 __u8 data; 503 dbg("%s called: %2.2x", __func__, d); 504 if (parport_prologue(pp) < 0) 505 return; 506 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 507 write_mos_reg(mos_parport->serial, dummy, DCR, data); 508 mos_parport->shadowDCR = data; 509 parport_epilogue(pp); 510 } 511 512 static unsigned char parport_mos7715_read_control(struct parport *pp) 513 { 514 struct mos7715_parport *mos_parport = pp->private_data; 515 __u8 dcr; 516 dbg("%s called", __func__); 517 spin_lock(&release_lock); 518 mos_parport = pp->private_data; 519 if (unlikely(mos_parport == NULL)) { 520 spin_unlock(&release_lock); 521 return 0; 522 } 523 dcr = mos_parport->shadowDCR & 0x0f; 524 spin_unlock(&release_lock); 525 return dcr; 526 } 527 528 static unsigned char parport_mos7715_frob_control(struct parport *pp, 529 unsigned char mask, 530 unsigned char val) 531 { 532 struct mos7715_parport *mos_parport = pp->private_data; 533 __u8 dcr; 534 dbg("%s called", __func__); 535 mask &= 0x0f; 536 val &= 0x0f; 537 if (parport_prologue(pp) < 0) 538 return 0; 539 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 540 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 541 dcr = mos_parport->shadowDCR & 0x0f; 542 parport_epilogue(pp); 543 return dcr; 544 } 545 546 static unsigned char parport_mos7715_read_status(struct parport *pp) 547 { 548 unsigned char status; 549 struct mos7715_parport *mos_parport = pp->private_data; 550 dbg("%s called", __func__); 551 spin_lock(&release_lock); 552 mos_parport = pp->private_data; 553 if (unlikely(mos_parport == NULL)) { /* release called */ 554 spin_unlock(&release_lock); 555 return 0; 556 } 557 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 558 spin_unlock(&release_lock); 559 return status; 560 } 561 562 static void parport_mos7715_enable_irq(struct parport *pp) 563 { 564 dbg("%s called", __func__); 565 } 566 static void parport_mos7715_disable_irq(struct parport *pp) 567 { 568 dbg("%s called", __func__); 569 } 570 571 static void parport_mos7715_data_forward(struct parport *pp) 572 { 573 struct mos7715_parport *mos_parport = pp->private_data; 574 dbg("%s called", __func__); 575 if (parport_prologue(pp) < 0) 576 return; 577 mos7715_change_mode(mos_parport, PS2); 578 mos_parport->shadowDCR &= ~0x20; 579 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 580 parport_epilogue(pp); 581 } 582 583 static void parport_mos7715_data_reverse(struct parport *pp) 584 { 585 struct mos7715_parport *mos_parport = pp->private_data; 586 dbg("%s called", __func__); 587 if (parport_prologue(pp) < 0) 588 return; 589 mos7715_change_mode(mos_parport, PS2); 590 mos_parport->shadowDCR |= 0x20; 591 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 592 parport_epilogue(pp); 593 } 594 595 static void parport_mos7715_init_state(struct pardevice *dev, 596 struct parport_state *s) 597 { 598 dbg("%s called", __func__); 599 s->u.pc.ctr = DCR_INIT_VAL; 600 s->u.pc.ecr = ECR_INIT_VAL; 601 } 602 603 /* N.B. Parport core code requires that this function not block */ 604 static void parport_mos7715_save_state(struct parport *pp, 605 struct parport_state *s) 606 { 607 struct mos7715_parport *mos_parport; 608 dbg("%s called", __func__); 609 spin_lock(&release_lock); 610 mos_parport = pp->private_data; 611 if (unlikely(mos_parport == NULL)) { /* release called */ 612 spin_unlock(&release_lock); 613 return; 614 } 615 s->u.pc.ctr = mos_parport->shadowDCR; 616 s->u.pc.ecr = mos_parport->shadowECR; 617 spin_unlock(&release_lock); 618 } 619 620 /* N.B. Parport core code requires that this function not block */ 621 static void parport_mos7715_restore_state(struct parport *pp, 622 struct parport_state *s) 623 { 624 struct mos7715_parport *mos_parport; 625 dbg("%s called", __func__); 626 spin_lock(&release_lock); 627 mos_parport = pp->private_data; 628 if (unlikely(mos_parport == NULL)) { /* release called */ 629 spin_unlock(&release_lock); 630 return; 631 } 632 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR); 633 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR); 634 spin_unlock(&release_lock); 635 } 636 637 static size_t parport_mos7715_write_compat(struct parport *pp, 638 const void *buffer, 639 size_t len, int flags) 640 { 641 int retval; 642 struct mos7715_parport *mos_parport = pp->private_data; 643 int actual_len; 644 dbg("%s called: %u chars", __func__, (unsigned int)len); 645 if (parport_prologue(pp) < 0) 646 return 0; 647 mos7715_change_mode(mos_parport, PPF); 648 retval = usb_bulk_msg(mos_parport->serial->dev, 649 usb_sndbulkpipe(mos_parport->serial->dev, 2), 650 (void *)buffer, len, &actual_len, 651 MOS_WDR_TIMEOUT); 652 parport_epilogue(pp); 653 if (retval) { 654 dev_err(&mos_parport->serial->dev->dev, 655 "mos7720: usb_bulk_msg() failed: %d", retval); 656 return 0; 657 } 658 return actual_len; 659 } 660 661 static struct parport_operations parport_mos7715_ops = { 662 .owner = THIS_MODULE, 663 .write_data = parport_mos7715_write_data, 664 .read_data = parport_mos7715_read_data, 665 666 .write_control = parport_mos7715_write_control, 667 .read_control = parport_mos7715_read_control, 668 .frob_control = parport_mos7715_frob_control, 669 670 .read_status = parport_mos7715_read_status, 671 672 .enable_irq = parport_mos7715_enable_irq, 673 .disable_irq = parport_mos7715_disable_irq, 674 675 .data_forward = parport_mos7715_data_forward, 676 .data_reverse = parport_mos7715_data_reverse, 677 678 .init_state = parport_mos7715_init_state, 679 .save_state = parport_mos7715_save_state, 680 .restore_state = parport_mos7715_restore_state, 681 682 .compat_write_data = parport_mos7715_write_compat, 683 684 .nibble_read_data = parport_ieee1284_read_nibble, 685 .byte_read_data = parport_ieee1284_read_byte, 686 }; 687 688 /* 689 * Allocate and initialize parallel port control struct, initialize 690 * the parallel port hardware device, and register with the parport subsystem. 691 */ 692 static int mos7715_parport_init(struct usb_serial *serial) 693 { 694 struct mos7715_parport *mos_parport; 695 696 /* allocate and initialize parallel port control struct */ 697 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 698 if (mos_parport == NULL) { 699 dbg("mos7715_parport_init: kzalloc failed"); 700 return -ENOMEM; 701 } 702 mos_parport->msg_pending = false; 703 kref_init(&mos_parport->ref_count); 704 spin_lock_init(&mos_parport->listlock); 705 INIT_LIST_HEAD(&mos_parport->active_urbs); 706 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 707 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 708 mos_parport->serial = serial; 709 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 710 (unsigned long) mos_parport); 711 init_completion(&mos_parport->syncmsg_compl); 712 713 /* cycle parallel port reset bit */ 714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80); 715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00); 716 717 /* initialize device registers */ 718 mos_parport->shadowDCR = DCR_INIT_VAL; 719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR); 720 mos_parport->shadowECR = ECR_INIT_VAL; 721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR); 722 723 /* register with parport core */ 724 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 725 PARPORT_DMA_NONE, 726 &parport_mos7715_ops); 727 if (mos_parport->pp == NULL) { 728 dev_err(&serial->interface->dev, 729 "Could not register parport\n"); 730 kref_put(&mos_parport->ref_count, destroy_mos_parport); 731 return -EIO; 732 } 733 mos_parport->pp->private_data = mos_parport; 734 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 735 mos_parport->pp->dev = &serial->interface->dev; 736 parport_announce_port(mos_parport->pp); 737 738 return 0; 739 } 740 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 741 742 /* 743 * mos7720_interrupt_callback 744 * this is the callback function for when we have received data on the 745 * interrupt endpoint. 746 */ 747 static void mos7720_interrupt_callback(struct urb *urb) 748 { 749 int result; 750 int length; 751 int status = urb->status; 752 __u8 *data; 753 __u8 sp1; 754 __u8 sp2; 755 756 switch (status) { 757 case 0: 758 /* success */ 759 break; 760 case -ECONNRESET: 761 case -ENOENT: 762 case -ESHUTDOWN: 763 /* this urb is terminated, clean up */ 764 dbg("%s - urb shutting down with status: %d", __func__, 765 status); 766 return; 767 default: 768 dbg("%s - nonzero urb status received: %d", __func__, 769 status); 770 goto exit; 771 } 772 773 length = urb->actual_length; 774 data = urb->transfer_buffer; 775 776 /* Moschip get 4 bytes 777 * Byte 1 IIR Port 1 (port.number is 0) 778 * Byte 2 IIR Port 2 (port.number is 1) 779 * Byte 3 -------------- 780 * Byte 4 FIFO status for both */ 781 782 /* the above description is inverted 783 * oneukum 2007-03-14 */ 784 785 if (unlikely(length != 4)) { 786 dbg("Wrong data !!!"); 787 return; 788 } 789 790 sp1 = data[3]; 791 sp2 = data[2]; 792 793 if ((sp1 | sp2) & 0x01) { 794 /* No Interrupt Pending in both the ports */ 795 dbg("No Interrupt !!!"); 796 } else { 797 switch (sp1 & 0x0f) { 798 case SERIAL_IIR_RLS: 799 dbg("Serial Port 1: Receiver status error or address " 800 "bit detected in 9-bit mode\n"); 801 break; 802 case SERIAL_IIR_CTI: 803 dbg("Serial Port 1: Receiver time out"); 804 break; 805 case SERIAL_IIR_MS: 806 /* dbg("Serial Port 1: Modem status change"); */ 807 break; 808 } 809 810 switch (sp2 & 0x0f) { 811 case SERIAL_IIR_RLS: 812 dbg("Serial Port 2: Receiver status error or address " 813 "bit detected in 9-bit mode"); 814 break; 815 case SERIAL_IIR_CTI: 816 dbg("Serial Port 2: Receiver time out"); 817 break; 818 case SERIAL_IIR_MS: 819 /* dbg("Serial Port 2: Modem status change"); */ 820 break; 821 } 822 } 823 824 exit: 825 result = usb_submit_urb(urb, GFP_ATOMIC); 826 if (result) 827 dev_err(&urb->dev->dev, 828 "%s - Error %d submitting control urb\n", 829 __func__, result); 830 return; 831 } 832 833 /* 834 * mos7715_interrupt_callback 835 * this is the 7715's callback function for when we have received data on 836 * the interrupt endpoint. 837 */ 838 static void mos7715_interrupt_callback(struct urb *urb) 839 { 840 int result; 841 int length; 842 int status = urb->status; 843 __u8 *data; 844 __u8 iir; 845 846 switch (status) { 847 case 0: 848 /* success */ 849 break; 850 case -ECONNRESET: 851 case -ENOENT: 852 case -ESHUTDOWN: 853 case -ENODEV: 854 /* this urb is terminated, clean up */ 855 dbg("%s - urb shutting down with status: %d", __func__, 856 status); 857 return; 858 default: 859 dbg("%s - nonzero urb status received: %d", __func__, 860 status); 861 goto exit; 862 } 863 864 length = urb->actual_length; 865 data = urb->transfer_buffer; 866 867 /* Structure of data from 7715 device: 868 * Byte 1: IIR serial Port 869 * Byte 2: unused 870 * Byte 2: DSR parallel port 871 * Byte 4: FIFO status for both */ 872 873 if (unlikely(length != 4)) { 874 dbg("Wrong data !!!"); 875 return; 876 } 877 878 iir = data[0]; 879 if (!(iir & 0x01)) { /* serial port interrupt pending */ 880 switch (iir & 0x0f) { 881 case SERIAL_IIR_RLS: 882 dbg("Serial Port: Receiver status error or address " 883 "bit detected in 9-bit mode\n"); 884 break; 885 case SERIAL_IIR_CTI: 886 dbg("Serial Port: Receiver time out"); 887 break; 888 case SERIAL_IIR_MS: 889 /* dbg("Serial Port: Modem status change"); */ 890 break; 891 } 892 } 893 894 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 895 { /* update local copy of DSR reg */ 896 struct usb_serial_port *port = urb->context; 897 struct mos7715_parport *mos_parport = port->serial->private; 898 if (unlikely(mos_parport == NULL)) 899 return; 900 atomic_set(&mos_parport->shadowDSR, data[2]); 901 } 902 #endif 903 904 exit: 905 result = usb_submit_urb(urb, GFP_ATOMIC); 906 if (result) 907 dev_err(&urb->dev->dev, 908 "%s - Error %d submitting control urb\n", 909 __func__, result); 910 return; 911 } 912 913 /* 914 * mos7720_bulk_in_callback 915 * this is the callback function for when we have received data on the 916 * bulk in endpoint. 917 */ 918 static void mos7720_bulk_in_callback(struct urb *urb) 919 { 920 int retval; 921 unsigned char *data ; 922 struct usb_serial_port *port; 923 struct tty_struct *tty; 924 int status = urb->status; 925 926 if (status) { 927 dbg("nonzero read bulk status received: %d", status); 928 return; 929 } 930 931 port = urb->context; 932 933 dbg("Entering...%s", __func__); 934 935 data = urb->transfer_buffer; 936 937 tty = tty_port_tty_get(&port->port); 938 if (tty && urb->actual_length) { 939 tty_insert_flip_string(tty, data, urb->actual_length); 940 tty_flip_buffer_push(tty); 941 } 942 tty_kref_put(tty); 943 944 if (!port->read_urb) { 945 dbg("URB KILLED !!!"); 946 return; 947 } 948 949 if (port->read_urb->status != -EINPROGRESS) { 950 port->read_urb->dev = port->serial->dev; 951 952 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 953 if (retval) 954 dbg("usb_submit_urb(read bulk) failed, retval = %d", 955 retval); 956 } 957 } 958 959 /* 960 * mos7720_bulk_out_data_callback 961 * this is the callback function for when we have finished sending serial 962 * data on the bulk out endpoint. 963 */ 964 static void mos7720_bulk_out_data_callback(struct urb *urb) 965 { 966 struct moschip_port *mos7720_port; 967 struct tty_struct *tty; 968 int status = urb->status; 969 970 if (status) { 971 dbg("nonzero write bulk status received:%d", status); 972 return; 973 } 974 975 mos7720_port = urb->context; 976 if (!mos7720_port) { 977 dbg("NULL mos7720_port pointer"); 978 return ; 979 } 980 981 tty = tty_port_tty_get(&mos7720_port->port->port); 982 983 if (tty && mos7720_port->open) 984 tty_wakeup(tty); 985 tty_kref_put(tty); 986 } 987 988 /* 989 * mos77xx_probe 990 * this function installs the appropriate read interrupt endpoint callback 991 * depending on whether the device is a 7720 or 7715, thus avoiding costly 992 * run-time checks in the high-frequency callback routine itself. 993 */ 994 static int mos77xx_probe(struct usb_serial *serial, 995 const struct usb_device_id *id) 996 { 997 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 998 moschip7720_2port_driver.read_int_callback = 999 mos7715_interrupt_callback; 1000 else 1001 moschip7720_2port_driver.read_int_callback = 1002 mos7720_interrupt_callback; 1003 1004 return 0; 1005 } 1006 1007 static int mos77xx_calc_num_ports(struct usb_serial *serial) 1008 { 1009 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1010 if (product == MOSCHIP_DEVICE_ID_7715) 1011 return 1; 1012 1013 return 2; 1014 } 1015 1016 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 1017 { 1018 struct usb_serial *serial; 1019 struct usb_serial_port *port0; 1020 struct urb *urb; 1021 struct moschip_port *mos7720_port; 1022 int response; 1023 int port_number; 1024 __u8 data; 1025 int allocated_urbs = 0; 1026 int j; 1027 1028 serial = port->serial; 1029 1030 mos7720_port = usb_get_serial_port_data(port); 1031 if (mos7720_port == NULL) 1032 return -ENODEV; 1033 1034 port0 = serial->port[0]; 1035 1036 usb_clear_halt(serial->dev, port->write_urb->pipe); 1037 usb_clear_halt(serial->dev, port->read_urb->pipe); 1038 1039 /* Initialising the write urb pool */ 1040 for (j = 0; j < NUM_URBS; ++j) { 1041 urb = usb_alloc_urb(0, GFP_KERNEL); 1042 mos7720_port->write_urb_pool[j] = urb; 1043 1044 if (urb == NULL) { 1045 dev_err(&port->dev, "No more urbs???\n"); 1046 continue; 1047 } 1048 1049 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1050 GFP_KERNEL); 1051 if (!urb->transfer_buffer) { 1052 dev_err(&port->dev, 1053 "%s-out of memory for urb buffers.\n", 1054 __func__); 1055 usb_free_urb(mos7720_port->write_urb_pool[j]); 1056 mos7720_port->write_urb_pool[j] = NULL; 1057 continue; 1058 } 1059 allocated_urbs++; 1060 } 1061 1062 if (!allocated_urbs) 1063 return -ENOMEM; 1064 1065 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1066 * 1067 * Register Index 1068 * 0 : THR/RHR 1069 * 1 : IER 1070 * 2 : FCR 1071 * 3 : LCR 1072 * 4 : MCR 1073 * 5 : LSR 1074 * 6 : MSR 1075 * 7 : SPR 1076 * 1077 * 0x08 : SP1/2 Control Reg 1078 */ 1079 port_number = port->number - port->serial->minor; 1080 read_mos_reg(serial, port_number, LSR, &data); 1081 1082 dbg("SS::%p LSR:%x", mos7720_port, data); 1083 1084 dbg("Check:Sending Command .........."); 1085 1086 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1087 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1088 1089 write_mos_reg(serial, port_number, IER, 0x00); 1090 write_mos_reg(serial, port_number, FCR, 0x00); 1091 1092 write_mos_reg(serial, port_number, FCR, 0xcf); 1093 mos7720_port->shadowLCR = 0x03; 1094 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1095 mos7720_port->shadowMCR = 0x0b; 1096 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1097 1098 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1099 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1100 data = data | (port->number - port->serial->minor + 1); 1101 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1102 mos7720_port->shadowLCR = 0x83; 1103 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1104 write_mos_reg(serial, port_number, THR, 0x0c); 1105 write_mos_reg(serial, port_number, IER, 0x00); 1106 mos7720_port->shadowLCR = 0x03; 1107 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1108 write_mos_reg(serial, port_number, IER, 0x0c); 1109 1110 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1111 if (response) 1112 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1113 __func__, response); 1114 1115 /* initialize our icount structure */ 1116 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1117 1118 /* initialize our port settings */ 1119 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1120 1121 /* send a open port command */ 1122 mos7720_port->open = 1; 1123 1124 return 0; 1125 } 1126 1127 /* 1128 * mos7720_chars_in_buffer 1129 * this function is called by the tty driver when it wants to know how many 1130 * bytes of data we currently have outstanding in the port (data that has 1131 * been written, but hasn't made it out the port yet) 1132 * If successful, we return the number of bytes left to be written in the 1133 * system, 1134 * Otherwise we return a negative error number. 1135 */ 1136 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1137 { 1138 struct usb_serial_port *port = tty->driver_data; 1139 int i; 1140 int chars = 0; 1141 struct moschip_port *mos7720_port; 1142 1143 dbg("%s:entering ...........", __func__); 1144 1145 mos7720_port = usb_get_serial_port_data(port); 1146 if (mos7720_port == NULL) { 1147 dbg("%s:leaving ...........", __func__); 1148 return 0; 1149 } 1150 1151 for (i = 0; i < NUM_URBS; ++i) { 1152 if (mos7720_port->write_urb_pool[i] && 1153 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1154 chars += URB_TRANSFER_BUFFER_SIZE; 1155 } 1156 dbg("%s - returns %d", __func__, chars); 1157 return chars; 1158 } 1159 1160 static void mos7720_close(struct usb_serial_port *port) 1161 { 1162 struct usb_serial *serial; 1163 struct moschip_port *mos7720_port; 1164 int j; 1165 1166 dbg("mos7720_close:entering..."); 1167 1168 serial = port->serial; 1169 1170 mos7720_port = usb_get_serial_port_data(port); 1171 if (mos7720_port == NULL) 1172 return; 1173 1174 for (j = 0; j < NUM_URBS; ++j) 1175 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1176 1177 /* Freeing Write URBs */ 1178 for (j = 0; j < NUM_URBS; ++j) { 1179 if (mos7720_port->write_urb_pool[j]) { 1180 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1181 usb_free_urb(mos7720_port->write_urb_pool[j]); 1182 } 1183 } 1184 1185 /* While closing port, shutdown all bulk read, write * 1186 * and interrupt read if they exists, otherwise nop */ 1187 dbg("Shutdown bulk write"); 1188 usb_kill_urb(port->write_urb); 1189 dbg("Shutdown bulk read"); 1190 usb_kill_urb(port->read_urb); 1191 1192 mutex_lock(&serial->disc_mutex); 1193 /* these commands must not be issued if the device has 1194 * been disconnected */ 1195 if (!serial->disconnected) { 1196 write_mos_reg(serial, port->number - port->serial->minor, 1197 MCR, 0x00); 1198 write_mos_reg(serial, port->number - port->serial->minor, 1199 IER, 0x00); 1200 } 1201 mutex_unlock(&serial->disc_mutex); 1202 mos7720_port->open = 0; 1203 1204 dbg("Leaving %s", __func__); 1205 } 1206 1207 static void mos7720_break(struct tty_struct *tty, int break_state) 1208 { 1209 struct usb_serial_port *port = tty->driver_data; 1210 unsigned char data; 1211 struct usb_serial *serial; 1212 struct moschip_port *mos7720_port; 1213 1214 dbg("Entering %s", __func__); 1215 1216 serial = port->serial; 1217 1218 mos7720_port = usb_get_serial_port_data(port); 1219 if (mos7720_port == NULL) 1220 return; 1221 1222 if (break_state == -1) 1223 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1224 else 1225 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1226 1227 mos7720_port->shadowLCR = data; 1228 write_mos_reg(serial, port->number - port->serial->minor, 1229 LCR, mos7720_port->shadowLCR); 1230 1231 return; 1232 } 1233 1234 /* 1235 * mos7720_write_room 1236 * this function is called by the tty driver when it wants to know how many 1237 * bytes of data we can accept for a specific port. 1238 * If successful, we return the amount of room that we have for this port 1239 * Otherwise we return a negative error number. 1240 */ 1241 static int mos7720_write_room(struct tty_struct *tty) 1242 { 1243 struct usb_serial_port *port = tty->driver_data; 1244 struct moschip_port *mos7720_port; 1245 int room = 0; 1246 int i; 1247 1248 dbg("%s:entering ...........", __func__); 1249 1250 mos7720_port = usb_get_serial_port_data(port); 1251 if (mos7720_port == NULL) { 1252 dbg("%s:leaving ...........", __func__); 1253 return -ENODEV; 1254 } 1255 1256 /* FIXME: Locking */ 1257 for (i = 0; i < NUM_URBS; ++i) { 1258 if (mos7720_port->write_urb_pool[i] && 1259 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1260 room += URB_TRANSFER_BUFFER_SIZE; 1261 } 1262 1263 dbg("%s - returns %d", __func__, room); 1264 return room; 1265 } 1266 1267 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1268 const unsigned char *data, int count) 1269 { 1270 int status; 1271 int i; 1272 int bytes_sent = 0; 1273 int transfer_size; 1274 1275 struct moschip_port *mos7720_port; 1276 struct usb_serial *serial; 1277 struct urb *urb; 1278 const unsigned char *current_position = data; 1279 1280 dbg("%s:entering ...........", __func__); 1281 1282 serial = port->serial; 1283 1284 mos7720_port = usb_get_serial_port_data(port); 1285 if (mos7720_port == NULL) { 1286 dbg("mos7720_port is NULL"); 1287 return -ENODEV; 1288 } 1289 1290 /* try to find a free urb in the list */ 1291 urb = NULL; 1292 1293 for (i = 0; i < NUM_URBS; ++i) { 1294 if (mos7720_port->write_urb_pool[i] && 1295 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1296 urb = mos7720_port->write_urb_pool[i]; 1297 dbg("URB:%d", i); 1298 break; 1299 } 1300 } 1301 1302 if (urb == NULL) { 1303 dbg("%s - no more free urbs", __func__); 1304 goto exit; 1305 } 1306 1307 if (urb->transfer_buffer == NULL) { 1308 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1309 GFP_KERNEL); 1310 if (urb->transfer_buffer == NULL) { 1311 dev_err(&port->dev, "%s no more kernel memory...\n", 1312 __func__); 1313 goto exit; 1314 } 1315 } 1316 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1317 1318 memcpy(urb->transfer_buffer, current_position, transfer_size); 1319 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size, 1320 urb->transfer_buffer); 1321 1322 /* fill urb with data and submit */ 1323 usb_fill_bulk_urb(urb, serial->dev, 1324 usb_sndbulkpipe(serial->dev, 1325 port->bulk_out_endpointAddress), 1326 urb->transfer_buffer, transfer_size, 1327 mos7720_bulk_out_data_callback, mos7720_port); 1328 1329 /* send it down the pipe */ 1330 status = usb_submit_urb(urb, GFP_ATOMIC); 1331 if (status) { 1332 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed " 1333 "with status = %d\n", __func__, status); 1334 bytes_sent = status; 1335 goto exit; 1336 } 1337 bytes_sent = transfer_size; 1338 1339 exit: 1340 return bytes_sent; 1341 } 1342 1343 static void mos7720_throttle(struct tty_struct *tty) 1344 { 1345 struct usb_serial_port *port = tty->driver_data; 1346 struct moschip_port *mos7720_port; 1347 int status; 1348 1349 dbg("%s- port %d", __func__, port->number); 1350 1351 mos7720_port = usb_get_serial_port_data(port); 1352 1353 if (mos7720_port == NULL) 1354 return; 1355 1356 if (!mos7720_port->open) { 1357 dbg("port not opened"); 1358 return; 1359 } 1360 1361 dbg("%s: Entering ..........", __func__); 1362 1363 /* if we are implementing XON/XOFF, send the stop character */ 1364 if (I_IXOFF(tty)) { 1365 unsigned char stop_char = STOP_CHAR(tty); 1366 status = mos7720_write(tty, port, &stop_char, 1); 1367 if (status <= 0) 1368 return; 1369 } 1370 1371 /* if we are implementing RTS/CTS, toggle that line */ 1372 if (tty->termios->c_cflag & CRTSCTS) { 1373 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1374 write_mos_reg(port->serial, port->number - port->serial->minor, 1375 MCR, mos7720_port->shadowMCR); 1376 if (status != 0) 1377 return; 1378 } 1379 } 1380 1381 static void mos7720_unthrottle(struct tty_struct *tty) 1382 { 1383 struct usb_serial_port *port = tty->driver_data; 1384 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1385 int status; 1386 1387 if (mos7720_port == NULL) 1388 return; 1389 1390 if (!mos7720_port->open) { 1391 dbg("%s - port not opened", __func__); 1392 return; 1393 } 1394 1395 dbg("%s: Entering ..........", __func__); 1396 1397 /* if we are implementing XON/XOFF, send the start character */ 1398 if (I_IXOFF(tty)) { 1399 unsigned char start_char = START_CHAR(tty); 1400 status = mos7720_write(tty, port, &start_char, 1); 1401 if (status <= 0) 1402 return; 1403 } 1404 1405 /* if we are implementing RTS/CTS, toggle that line */ 1406 if (tty->termios->c_cflag & CRTSCTS) { 1407 mos7720_port->shadowMCR |= UART_MCR_RTS; 1408 write_mos_reg(port->serial, port->number - port->serial->minor, 1409 MCR, mos7720_port->shadowMCR); 1410 if (status != 0) 1411 return; 1412 } 1413 } 1414 1415 /* FIXME: this function does not work */ 1416 static int set_higher_rates(struct moschip_port *mos7720_port, 1417 unsigned int baud) 1418 { 1419 struct usb_serial_port *port; 1420 struct usb_serial *serial; 1421 int port_number; 1422 enum mos_regs sp_reg; 1423 if (mos7720_port == NULL) 1424 return -EINVAL; 1425 1426 port = mos7720_port->port; 1427 serial = port->serial; 1428 1429 /*********************************************** 1430 * Init Sequence for higher rates 1431 ***********************************************/ 1432 dbg("Sending Setting Commands .........."); 1433 port_number = port->number - port->serial->minor; 1434 1435 write_mos_reg(serial, port_number, IER, 0x00); 1436 write_mos_reg(serial, port_number, FCR, 0x00); 1437 write_mos_reg(serial, port_number, FCR, 0xcf); 1438 mos7720_port->shadowMCR = 0x0b; 1439 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1440 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1441 1442 /*********************************************** 1443 * Set for higher rates * 1444 ***********************************************/ 1445 /* writing baud rate verbatum into uart clock field clearly not right */ 1446 if (port_number == 0) 1447 sp_reg = SP1_REG; 1448 else 1449 sp_reg = SP2_REG; 1450 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1451 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1452 mos7720_port->shadowMCR = 0x2b; 1453 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1454 1455 /*********************************************** 1456 * Set DLL/DLM 1457 ***********************************************/ 1458 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1459 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1460 write_mos_reg(serial, port_number, DLL, 0x01); 1461 write_mos_reg(serial, port_number, DLM, 0x00); 1462 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1463 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1464 1465 return 0; 1466 } 1467 1468 /* baud rate information */ 1469 struct divisor_table_entry { 1470 __u32 baudrate; 1471 __u16 divisor; 1472 }; 1473 1474 /* Define table of divisors for moschip 7720 hardware * 1475 * These assume a 3.6864MHz crystal, the standard /16, and * 1476 * MCR.7 = 0. */ 1477 static struct divisor_table_entry divisor_table[] = { 1478 { 50, 2304}, 1479 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1480 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1481 { 150, 768}, 1482 { 300, 384}, 1483 { 600, 192}, 1484 { 1200, 96}, 1485 { 1800, 64}, 1486 { 2400, 48}, 1487 { 4800, 24}, 1488 { 7200, 16}, 1489 { 9600, 12}, 1490 { 19200, 6}, 1491 { 38400, 3}, 1492 { 57600, 2}, 1493 { 115200, 1}, 1494 }; 1495 1496 /***************************************************************************** 1497 * calc_baud_rate_divisor 1498 * this function calculates the proper baud rate divisor for the specified 1499 * baud rate. 1500 *****************************************************************************/ 1501 static int calc_baud_rate_divisor(int baudrate, int *divisor) 1502 { 1503 int i; 1504 __u16 custom; 1505 __u16 round1; 1506 __u16 round; 1507 1508 1509 dbg("%s - %d", __func__, baudrate); 1510 1511 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1512 if (divisor_table[i].baudrate == baudrate) { 1513 *divisor = divisor_table[i].divisor; 1514 return 0; 1515 } 1516 } 1517 1518 /* After trying for all the standard baud rates * 1519 * Try calculating the divisor for this baud rate */ 1520 if (baudrate > 75 && baudrate < 230400) { 1521 /* get the divisor */ 1522 custom = (__u16)(230400L / baudrate); 1523 1524 /* Check for round off */ 1525 round1 = (__u16)(2304000L / baudrate); 1526 round = (__u16)(round1 - (custom * 10)); 1527 if (round > 4) 1528 custom++; 1529 *divisor = custom; 1530 1531 dbg("Baud %d = %d", baudrate, custom); 1532 return 0; 1533 } 1534 1535 dbg("Baud calculation Failed..."); 1536 return -EINVAL; 1537 } 1538 1539 /* 1540 * send_cmd_write_baud_rate 1541 * this function sends the proper command to change the baud rate of the 1542 * specified port. 1543 */ 1544 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1545 int baudrate) 1546 { 1547 struct usb_serial_port *port; 1548 struct usb_serial *serial; 1549 int divisor; 1550 int status; 1551 unsigned char number; 1552 1553 if (mos7720_port == NULL) 1554 return -1; 1555 1556 port = mos7720_port->port; 1557 serial = port->serial; 1558 1559 dbg("%s: Entering ..........", __func__); 1560 1561 number = port->number - port->serial->minor; 1562 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate); 1563 1564 /* Calculate the Divisor */ 1565 status = calc_baud_rate_divisor(baudrate, &divisor); 1566 if (status) { 1567 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1568 return status; 1569 } 1570 1571 /* Enable access to divisor latch */ 1572 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1573 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1574 1575 /* Write the divisor */ 1576 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1577 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1578 1579 /* Disable access to divisor latch */ 1580 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1581 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1582 1583 return status; 1584 } 1585 1586 /* 1587 * change_port_settings 1588 * This routine is called to set the UART on the device to match 1589 * the specified new settings. 1590 */ 1591 static void change_port_settings(struct tty_struct *tty, 1592 struct moschip_port *mos7720_port, 1593 struct ktermios *old_termios) 1594 { 1595 struct usb_serial_port *port; 1596 struct usb_serial *serial; 1597 int baud; 1598 unsigned cflag; 1599 unsigned iflag; 1600 __u8 mask = 0xff; 1601 __u8 lData; 1602 __u8 lParity; 1603 __u8 lStop; 1604 int status; 1605 int port_number; 1606 1607 if (mos7720_port == NULL) 1608 return ; 1609 1610 port = mos7720_port->port; 1611 serial = port->serial; 1612 port_number = port->number - port->serial->minor; 1613 1614 dbg("%s - port %d", __func__, port->number); 1615 1616 if (!mos7720_port->open) { 1617 dbg("%s - port not opened", __func__); 1618 return; 1619 } 1620 1621 dbg("%s: Entering ..........", __func__); 1622 1623 lData = UART_LCR_WLEN8; 1624 lStop = 0x00; /* 1 stop bit */ 1625 lParity = 0x00; /* No parity */ 1626 1627 cflag = tty->termios->c_cflag; 1628 iflag = tty->termios->c_iflag; 1629 1630 /* Change the number of bits */ 1631 switch (cflag & CSIZE) { 1632 case CS5: 1633 lData = UART_LCR_WLEN5; 1634 mask = 0x1f; 1635 break; 1636 1637 case CS6: 1638 lData = UART_LCR_WLEN6; 1639 mask = 0x3f; 1640 break; 1641 1642 case CS7: 1643 lData = UART_LCR_WLEN7; 1644 mask = 0x7f; 1645 break; 1646 default: 1647 case CS8: 1648 lData = UART_LCR_WLEN8; 1649 break; 1650 } 1651 1652 /* Change the Parity bit */ 1653 if (cflag & PARENB) { 1654 if (cflag & PARODD) { 1655 lParity = UART_LCR_PARITY; 1656 dbg("%s - parity = odd", __func__); 1657 } else { 1658 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1659 dbg("%s - parity = even", __func__); 1660 } 1661 1662 } else { 1663 dbg("%s - parity = none", __func__); 1664 } 1665 1666 if (cflag & CMSPAR) 1667 lParity = lParity | 0x20; 1668 1669 /* Change the Stop bit */ 1670 if (cflag & CSTOPB) { 1671 lStop = UART_LCR_STOP; 1672 dbg("%s - stop bits = 2", __func__); 1673 } else { 1674 lStop = 0x00; 1675 dbg("%s - stop bits = 1", __func__); 1676 } 1677 1678 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1679 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1680 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1681 1682 /* Update the LCR with the correct value */ 1683 mos7720_port->shadowLCR &= 1684 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1685 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1686 1687 1688 /* Disable Interrupts */ 1689 write_mos_reg(serial, port_number, IER, 0x00); 1690 write_mos_reg(serial, port_number, FCR, 0x00); 1691 write_mos_reg(serial, port_number, FCR, 0xcf); 1692 1693 /* Send the updated LCR value to the mos7720 */ 1694 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1695 mos7720_port->shadowMCR = 0x0b; 1696 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1697 1698 /* set up the MCR register and send it to the mos7720 */ 1699 mos7720_port->shadowMCR = UART_MCR_OUT2; 1700 if (cflag & CBAUD) 1701 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1702 1703 if (cflag & CRTSCTS) { 1704 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1705 /* To set hardware flow control to the specified * 1706 * serial port, in SP1/2_CONTROL_REG */ 1707 if (port->number) 1708 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1709 else 1710 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1711 1712 } else 1713 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1714 1715 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1716 1717 /* Determine divisor based on baud rate */ 1718 baud = tty_get_baud_rate(tty); 1719 if (!baud) { 1720 /* pick a default, any default... */ 1721 dbg("Picked default baud..."); 1722 baud = 9600; 1723 } 1724 1725 if (baud >= 230400) { 1726 set_higher_rates(mos7720_port, baud); 1727 /* Enable Interrupts */ 1728 write_mos_reg(serial, port_number, IER, 0x0c); 1729 return; 1730 } 1731 1732 dbg("%s - baud rate = %d", __func__, baud); 1733 status = send_cmd_write_baud_rate(mos7720_port, baud); 1734 /* FIXME: needs to write actual resulting baud back not just 1735 blindly do so */ 1736 if (cflag & CBAUD) 1737 tty_encode_baud_rate(tty, baud, baud); 1738 /* Enable Interrupts */ 1739 write_mos_reg(serial, port_number, IER, 0x0c); 1740 1741 if (port->read_urb->status != -EINPROGRESS) { 1742 port->read_urb->dev = serial->dev; 1743 1744 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1745 if (status) 1746 dbg("usb_submit_urb(read bulk) failed, status = %d", 1747 status); 1748 } 1749 return; 1750 } 1751 1752 /* 1753 * mos7720_set_termios 1754 * this function is called by the tty driver when it wants to change the 1755 * termios structure. 1756 */ 1757 static void mos7720_set_termios(struct tty_struct *tty, 1758 struct usb_serial_port *port, struct ktermios *old_termios) 1759 { 1760 int status; 1761 unsigned int cflag; 1762 struct usb_serial *serial; 1763 struct moschip_port *mos7720_port; 1764 1765 serial = port->serial; 1766 1767 mos7720_port = usb_get_serial_port_data(port); 1768 1769 if (mos7720_port == NULL) 1770 return; 1771 1772 if (!mos7720_port->open) { 1773 dbg("%s - port not opened", __func__); 1774 return; 1775 } 1776 1777 dbg("%s\n", "setting termios - ASPIRE"); 1778 1779 cflag = tty->termios->c_cflag; 1780 1781 dbg("%s - cflag %08x iflag %08x", __func__, 1782 tty->termios->c_cflag, 1783 RELEVANT_IFLAG(tty->termios->c_iflag)); 1784 1785 dbg("%s - old cflag %08x old iflag %08x", __func__, 1786 old_termios->c_cflag, 1787 RELEVANT_IFLAG(old_termios->c_iflag)); 1788 1789 dbg("%s - port %d", __func__, port->number); 1790 1791 /* change the port settings to the new ones specified */ 1792 change_port_settings(tty, mos7720_port, old_termios); 1793 1794 if (!port->read_urb) { 1795 dbg("%s", "URB KILLED !!!!!"); 1796 return; 1797 } 1798 1799 if (port->read_urb->status != -EINPROGRESS) { 1800 port->read_urb->dev = serial->dev; 1801 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1802 if (status) 1803 dbg("usb_submit_urb(read bulk) failed, status = %d", 1804 status); 1805 } 1806 return; 1807 } 1808 1809 /* 1810 * get_lsr_info - get line status register info 1811 * 1812 * Purpose: Let user call ioctl() to get info when the UART physically 1813 * is emptied. On bus types like RS485, the transmitter must 1814 * release the bus after transmitting. This must be done when 1815 * the transmit shift register is empty, not be done when the 1816 * transmit holding register is empty. This functionality 1817 * allows an RS485 driver to be written in user space. 1818 */ 1819 static int get_lsr_info(struct tty_struct *tty, 1820 struct moschip_port *mos7720_port, unsigned int __user *value) 1821 { 1822 struct usb_serial_port *port = tty->driver_data; 1823 unsigned int result = 0; 1824 unsigned char data = 0; 1825 int port_number = port->number - port->serial->minor; 1826 int count; 1827 1828 count = mos7720_chars_in_buffer(tty); 1829 if (count == 0) { 1830 read_mos_reg(port->serial, port_number, LSR, &data); 1831 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1832 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1833 dbg("%s -- Empty", __func__); 1834 result = TIOCSER_TEMT; 1835 } 1836 } 1837 if (copy_to_user(value, &result, sizeof(int))) 1838 return -EFAULT; 1839 return 0; 1840 } 1841 1842 static int mos7720_tiocmget(struct tty_struct *tty, struct file *file) 1843 { 1844 struct usb_serial_port *port = tty->driver_data; 1845 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1846 unsigned int result = 0; 1847 unsigned int mcr ; 1848 unsigned int msr ; 1849 1850 dbg("%s - port %d", __func__, port->number); 1851 1852 mcr = mos7720_port->shadowMCR; 1853 msr = mos7720_port->shadowMSR; 1854 1855 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1856 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1857 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1858 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1859 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1860 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1861 1862 dbg("%s -- %x", __func__, result); 1863 1864 return result; 1865 } 1866 1867 static int mos7720_tiocmset(struct tty_struct *tty, struct file *file, 1868 unsigned int set, unsigned int clear) 1869 { 1870 struct usb_serial_port *port = tty->driver_data; 1871 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1872 unsigned int mcr ; 1873 dbg("%s - port %d", __func__, port->number); 1874 dbg("he was at tiocmget"); 1875 1876 mcr = mos7720_port->shadowMCR; 1877 1878 if (set & TIOCM_RTS) 1879 mcr |= UART_MCR_RTS; 1880 if (set & TIOCM_DTR) 1881 mcr |= UART_MCR_DTR; 1882 if (set & TIOCM_LOOP) 1883 mcr |= UART_MCR_LOOP; 1884 1885 if (clear & TIOCM_RTS) 1886 mcr &= ~UART_MCR_RTS; 1887 if (clear & TIOCM_DTR) 1888 mcr &= ~UART_MCR_DTR; 1889 if (clear & TIOCM_LOOP) 1890 mcr &= ~UART_MCR_LOOP; 1891 1892 mos7720_port->shadowMCR = mcr; 1893 write_mos_reg(port->serial, port->number - port->serial->minor, 1894 MCR, mos7720_port->shadowMCR); 1895 1896 return 0; 1897 } 1898 1899 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1900 unsigned int __user *value) 1901 { 1902 unsigned int mcr ; 1903 unsigned int arg; 1904 1905 struct usb_serial_port *port; 1906 1907 if (mos7720_port == NULL) 1908 return -1; 1909 1910 port = (struct usb_serial_port *)mos7720_port->port; 1911 mcr = mos7720_port->shadowMCR; 1912 1913 if (copy_from_user(&arg, value, sizeof(int))) 1914 return -EFAULT; 1915 1916 switch (cmd) { 1917 case TIOCMBIS: 1918 if (arg & TIOCM_RTS) 1919 mcr |= UART_MCR_RTS; 1920 if (arg & TIOCM_DTR) 1921 mcr |= UART_MCR_RTS; 1922 if (arg & TIOCM_LOOP) 1923 mcr |= UART_MCR_LOOP; 1924 break; 1925 1926 case TIOCMBIC: 1927 if (arg & TIOCM_RTS) 1928 mcr &= ~UART_MCR_RTS; 1929 if (arg & TIOCM_DTR) 1930 mcr &= ~UART_MCR_RTS; 1931 if (arg & TIOCM_LOOP) 1932 mcr &= ~UART_MCR_LOOP; 1933 break; 1934 1935 } 1936 1937 mos7720_port->shadowMCR = mcr; 1938 write_mos_reg(port->serial, port->number - port->serial->minor, 1939 MCR, mos7720_port->shadowMCR); 1940 1941 return 0; 1942 } 1943 1944 static int get_serial_info(struct moschip_port *mos7720_port, 1945 struct serial_struct __user *retinfo) 1946 { 1947 struct serial_struct tmp; 1948 1949 if (!retinfo) 1950 return -EFAULT; 1951 1952 memset(&tmp, 0, sizeof(tmp)); 1953 1954 tmp.type = PORT_16550A; 1955 tmp.line = mos7720_port->port->serial->minor; 1956 tmp.port = mos7720_port->port->number; 1957 tmp.irq = 0; 1958 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1959 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1960 tmp.baud_base = 9600; 1961 tmp.close_delay = 5*HZ; 1962 tmp.closing_wait = 30*HZ; 1963 1964 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1965 return -EFAULT; 1966 return 0; 1967 } 1968 1969 static int mos7720_ioctl(struct tty_struct *tty, struct file *file, 1970 unsigned int cmd, unsigned long arg) 1971 { 1972 struct usb_serial_port *port = tty->driver_data; 1973 struct moschip_port *mos7720_port; 1974 struct async_icount cnow; 1975 struct async_icount cprev; 1976 struct serial_icounter_struct icount; 1977 1978 mos7720_port = usb_get_serial_port_data(port); 1979 if (mos7720_port == NULL) 1980 return -ENODEV; 1981 1982 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); 1983 1984 switch (cmd) { 1985 case TIOCSERGETLSR: 1986 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number); 1987 return get_lsr_info(tty, mos7720_port, 1988 (unsigned int __user *)arg); 1989 return 0; 1990 1991 /* FIXME: These should be using the mode methods */ 1992 case TIOCMBIS: 1993 case TIOCMBIC: 1994 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", 1995 __func__, port->number); 1996 return set_modem_info(mos7720_port, cmd, 1997 (unsigned int __user *)arg); 1998 1999 case TIOCGSERIAL: 2000 dbg("%s (%d) TIOCGSERIAL", __func__, port->number); 2001 return get_serial_info(mos7720_port, 2002 (struct serial_struct __user *)arg); 2003 2004 case TIOCMIWAIT: 2005 dbg("%s (%d) TIOCMIWAIT", __func__, port->number); 2006 cprev = mos7720_port->icount; 2007 while (1) { 2008 if (signal_pending(current)) 2009 return -ERESTARTSYS; 2010 cnow = mos7720_port->icount; 2011 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 2012 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 2013 return -EIO; /* no change => error */ 2014 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 2015 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 2016 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 2017 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 2018 return 0; 2019 } 2020 cprev = cnow; 2021 } 2022 /* NOTREACHED */ 2023 break; 2024 2025 case TIOCGICOUNT: 2026 cnow = mos7720_port->icount; 2027 2028 memset(&icount, 0, sizeof(struct serial_icounter_struct)); 2029 2030 icount.cts = cnow.cts; 2031 icount.dsr = cnow.dsr; 2032 icount.rng = cnow.rng; 2033 icount.dcd = cnow.dcd; 2034 icount.rx = cnow.rx; 2035 icount.tx = cnow.tx; 2036 icount.frame = cnow.frame; 2037 icount.overrun = cnow.overrun; 2038 icount.parity = cnow.parity; 2039 icount.brk = cnow.brk; 2040 icount.buf_overrun = cnow.buf_overrun; 2041 2042 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, 2043 port->number, icount.rx, icount.tx); 2044 if (copy_to_user((void __user *)arg, &icount, sizeof(icount))) 2045 return -EFAULT; 2046 return 0; 2047 } 2048 2049 return -ENOIOCTLCMD; 2050 } 2051 2052 static int mos7720_startup(struct usb_serial *serial) 2053 { 2054 struct moschip_port *mos7720_port; 2055 struct usb_device *dev; 2056 int i; 2057 char data; 2058 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 2059 int ret_val; 2060 2061 dbg("%s: Entering ..........", __func__); 2062 2063 if (!serial) { 2064 dbg("Invalid Handler"); 2065 return -ENODEV; 2066 } 2067 2068 dev = serial->dev; 2069 2070 /* 2071 * The 7715 uses the first bulk in/out endpoint pair for the parallel 2072 * port, and the second for the serial port. Because the usbserial core 2073 * assumes both pairs are serial ports, we must engage in a bit of 2074 * subterfuge and swap the pointers for ports 0 and 1 in order to make 2075 * port 0 point to the serial port. However, both moschip devices use a 2076 * single interrupt-in endpoint for both ports (as mentioned a little 2077 * further down), and this endpoint was assigned to port 0. So after 2078 * the swap, we must copy the interrupt endpoint elements from port 1 2079 * (as newly assigned) to port 0, and null out port 1 pointers. 2080 */ 2081 if (product == MOSCHIP_DEVICE_ID_7715) { 2082 struct usb_serial_port *tmp = serial->port[0]; 2083 serial->port[0] = serial->port[1]; 2084 serial->port[1] = tmp; 2085 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 2086 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 2087 serial->port[0]->interrupt_in_endpointAddress = 2088 tmp->interrupt_in_endpointAddress; 2089 serial->port[1]->interrupt_in_urb = NULL; 2090 serial->port[1]->interrupt_in_buffer = NULL; 2091 } 2092 2093 2094 /* set up serial port private structures */ 2095 for (i = 0; i < serial->num_ports; ++i) { 2096 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2097 if (mos7720_port == NULL) { 2098 dev_err(&dev->dev, "%s - Out of memory\n", __func__); 2099 return -ENOMEM; 2100 } 2101 2102 /* Initialize all port interrupt end point to port 0 int 2103 * endpoint. Our device has only one interrupt endpoint 2104 * common to all ports */ 2105 serial->port[i]->interrupt_in_endpointAddress = 2106 serial->port[0]->interrupt_in_endpointAddress; 2107 2108 mos7720_port->port = serial->port[i]; 2109 usb_set_serial_port_data(serial->port[i], mos7720_port); 2110 2111 dbg("port number is %d", serial->port[i]->number); 2112 dbg("serial number is %d", serial->minor); 2113 } 2114 2115 2116 /* setting configuration feature to one */ 2117 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2118 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 2119 2120 /* start the interrupt urb */ 2121 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 2122 if (ret_val) 2123 dev_err(&dev->dev, 2124 "%s - Error %d submitting control urb\n", 2125 __func__, ret_val); 2126 2127 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2128 if (product == MOSCHIP_DEVICE_ID_7715) { 2129 ret_val = mos7715_parport_init(serial); 2130 if (ret_val < 0) 2131 return ret_val; 2132 } 2133 #endif 2134 /* LSR For Port 1 */ 2135 read_mos_reg(serial, 0, LSR, &data); 2136 dbg("LSR:%x", data); 2137 2138 return 0; 2139 } 2140 2141 static void mos7720_release(struct usb_serial *serial) 2142 { 2143 int i; 2144 2145 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2146 /* close the parallel port */ 2147 2148 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2149 == MOSCHIP_DEVICE_ID_7715) { 2150 struct urbtracker *urbtrack; 2151 unsigned long flags; 2152 struct mos7715_parport *mos_parport = 2153 usb_get_serial_data(serial); 2154 2155 /* prevent NULL ptr dereference in port callbacks */ 2156 spin_lock(&release_lock); 2157 mos_parport->pp->private_data = NULL; 2158 spin_unlock(&release_lock); 2159 2160 /* wait for synchronous usb calls to return */ 2161 if (mos_parport->msg_pending) 2162 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2163 MOS_WDR_TIMEOUT); 2164 2165 parport_remove_port(mos_parport->pp); 2166 usb_set_serial_data(serial, NULL); 2167 mos_parport->serial = NULL; 2168 2169 /* if tasklet currently scheduled, wait for it to complete */ 2170 tasklet_kill(&mos_parport->urb_tasklet); 2171 2172 /* unlink any urbs sent by the tasklet */ 2173 spin_lock_irqsave(&mos_parport->listlock, flags); 2174 list_for_each_entry(urbtrack, 2175 &mos_parport->active_urbs, 2176 urblist_entry) 2177 usb_unlink_urb(urbtrack->urb); 2178 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2179 2180 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2181 } 2182 #endif 2183 /* free private structure allocated for serial port */ 2184 for (i = 0; i < serial->num_ports; ++i) 2185 kfree(usb_get_serial_port_data(serial->port[i])); 2186 } 2187 2188 static struct usb_driver usb_driver = { 2189 .name = "moschip7720", 2190 .probe = usb_serial_probe, 2191 .disconnect = usb_serial_disconnect, 2192 .id_table = moschip_port_id_table, 2193 .no_dynamic_id = 1, 2194 }; 2195 2196 static struct usb_serial_driver moschip7720_2port_driver = { 2197 .driver = { 2198 .owner = THIS_MODULE, 2199 .name = "moschip7720", 2200 }, 2201 .description = "Moschip 2 port adapter", 2202 .usb_driver = &usb_driver, 2203 .id_table = moschip_port_id_table, 2204 .calc_num_ports = mos77xx_calc_num_ports, 2205 .open = mos7720_open, 2206 .close = mos7720_close, 2207 .throttle = mos7720_throttle, 2208 .unthrottle = mos7720_unthrottle, 2209 .probe = mos77xx_probe, 2210 .attach = mos7720_startup, 2211 .release = mos7720_release, 2212 .ioctl = mos7720_ioctl, 2213 .tiocmget = mos7720_tiocmget, 2214 .tiocmset = mos7720_tiocmset, 2215 .set_termios = mos7720_set_termios, 2216 .write = mos7720_write, 2217 .write_room = mos7720_write_room, 2218 .chars_in_buffer = mos7720_chars_in_buffer, 2219 .break_ctl = mos7720_break, 2220 .read_bulk_callback = mos7720_bulk_in_callback, 2221 .read_int_callback = NULL /* dynamically assigned in probe() */ 2222 }; 2223 2224 static int __init moschip7720_init(void) 2225 { 2226 int retval; 2227 2228 dbg("%s: Entering ..........", __func__); 2229 2230 /* Register with the usb serial */ 2231 retval = usb_serial_register(&moschip7720_2port_driver); 2232 if (retval) 2233 goto failed_port_device_register; 2234 2235 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 2236 DRIVER_DESC "\n"); 2237 2238 /* Register with the usb */ 2239 retval = usb_register(&usb_driver); 2240 if (retval) 2241 goto failed_usb_register; 2242 2243 return 0; 2244 2245 failed_usb_register: 2246 usb_serial_deregister(&moschip7720_2port_driver); 2247 2248 failed_port_device_register: 2249 return retval; 2250 } 2251 2252 static void __exit moschip7720_exit(void) 2253 { 2254 usb_deregister(&usb_driver); 2255 usb_serial_deregister(&moschip7720_2port_driver); 2256 } 2257 2258 module_init(moschip7720_init); 2259 module_exit(moschip7720_exit); 2260 2261 /* Module information */ 2262 MODULE_AUTHOR(DRIVER_AUTHOR); 2263 MODULE_DESCRIPTION(DRIVER_DESC); 2264 MODULE_LICENSE("GPL"); 2265 2266 module_param(debug, bool, S_IRUGO | S_IWUSR); 2267 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2268