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 bool 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 } 831 832 /* 833 * mos7715_interrupt_callback 834 * this is the 7715's callback function for when we have received data on 835 * the interrupt endpoint. 836 */ 837 static void mos7715_interrupt_callback(struct urb *urb) 838 { 839 int result; 840 int length; 841 int status = urb->status; 842 __u8 *data; 843 __u8 iir; 844 845 switch (status) { 846 case 0: 847 /* success */ 848 break; 849 case -ECONNRESET: 850 case -ENOENT: 851 case -ESHUTDOWN: 852 case -ENODEV: 853 /* this urb is terminated, clean up */ 854 dbg("%s - urb shutting down with status: %d", __func__, 855 status); 856 return; 857 default: 858 dbg("%s - nonzero urb status received: %d", __func__, 859 status); 860 goto exit; 861 } 862 863 length = urb->actual_length; 864 data = urb->transfer_buffer; 865 866 /* Structure of data from 7715 device: 867 * Byte 1: IIR serial Port 868 * Byte 2: unused 869 * Byte 2: DSR parallel port 870 * Byte 4: FIFO status for both */ 871 872 if (unlikely(length != 4)) { 873 dbg("Wrong data !!!"); 874 return; 875 } 876 877 iir = data[0]; 878 if (!(iir & 0x01)) { /* serial port interrupt pending */ 879 switch (iir & 0x0f) { 880 case SERIAL_IIR_RLS: 881 dbg("Serial Port: Receiver status error or address " 882 "bit detected in 9-bit mode\n"); 883 break; 884 case SERIAL_IIR_CTI: 885 dbg("Serial Port: Receiver time out"); 886 break; 887 case SERIAL_IIR_MS: 888 /* dbg("Serial Port: Modem status change"); */ 889 break; 890 } 891 } 892 893 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 894 { /* update local copy of DSR reg */ 895 struct usb_serial_port *port = urb->context; 896 struct mos7715_parport *mos_parport = port->serial->private; 897 if (unlikely(mos_parport == NULL)) 898 return; 899 atomic_set(&mos_parport->shadowDSR, data[2]); 900 } 901 #endif 902 903 exit: 904 result = usb_submit_urb(urb, GFP_ATOMIC); 905 if (result) 906 dev_err(&urb->dev->dev, 907 "%s - Error %d submitting control urb\n", 908 __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 struct tty_struct *tty; 922 int status = urb->status; 923 924 if (status) { 925 dbg("nonzero read bulk status received: %d", status); 926 return; 927 } 928 929 port = urb->context; 930 931 dbg("Entering...%s", __func__); 932 933 data = urb->transfer_buffer; 934 935 tty = tty_port_tty_get(&port->port); 936 if (tty && urb->actual_length) { 937 tty_insert_flip_string(tty, data, urb->actual_length); 938 tty_flip_buffer_push(tty); 939 } 940 tty_kref_put(tty); 941 942 if (port->read_urb->status != -EINPROGRESS) { 943 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 944 if (retval) 945 dbg("usb_submit_urb(read bulk) failed, retval = %d", 946 retval); 947 } 948 } 949 950 /* 951 * mos7720_bulk_out_data_callback 952 * this is the callback function for when we have finished sending serial 953 * data on the bulk out endpoint. 954 */ 955 static void mos7720_bulk_out_data_callback(struct urb *urb) 956 { 957 struct moschip_port *mos7720_port; 958 struct tty_struct *tty; 959 int status = urb->status; 960 961 if (status) { 962 dbg("nonzero write bulk status received:%d", status); 963 return; 964 } 965 966 mos7720_port = urb->context; 967 if (!mos7720_port) { 968 dbg("NULL mos7720_port pointer"); 969 return ; 970 } 971 972 tty = tty_port_tty_get(&mos7720_port->port->port); 973 974 if (tty && mos7720_port->open) 975 tty_wakeup(tty); 976 tty_kref_put(tty); 977 } 978 979 /* 980 * mos77xx_probe 981 * this function installs the appropriate read interrupt endpoint callback 982 * depending on whether the device is a 7720 or 7715, thus avoiding costly 983 * run-time checks in the high-frequency callback routine itself. 984 */ 985 static int mos77xx_probe(struct usb_serial *serial, 986 const struct usb_device_id *id) 987 { 988 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 989 moschip7720_2port_driver.read_int_callback = 990 mos7715_interrupt_callback; 991 else 992 moschip7720_2port_driver.read_int_callback = 993 mos7720_interrupt_callback; 994 995 return 0; 996 } 997 998 static int mos77xx_calc_num_ports(struct usb_serial *serial) 999 { 1000 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1001 if (product == MOSCHIP_DEVICE_ID_7715) 1002 return 1; 1003 1004 return 2; 1005 } 1006 1007 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 1008 { 1009 struct usb_serial *serial; 1010 struct urb *urb; 1011 struct moschip_port *mos7720_port; 1012 int response; 1013 int port_number; 1014 __u8 data; 1015 int allocated_urbs = 0; 1016 int j; 1017 1018 serial = port->serial; 1019 1020 mos7720_port = usb_get_serial_port_data(port); 1021 if (mos7720_port == NULL) 1022 return -ENODEV; 1023 1024 usb_clear_halt(serial->dev, port->write_urb->pipe); 1025 usb_clear_halt(serial->dev, port->read_urb->pipe); 1026 1027 /* Initialising the write urb pool */ 1028 for (j = 0; j < NUM_URBS; ++j) { 1029 urb = usb_alloc_urb(0, GFP_KERNEL); 1030 mos7720_port->write_urb_pool[j] = urb; 1031 1032 if (urb == NULL) { 1033 dev_err(&port->dev, "No more urbs???\n"); 1034 continue; 1035 } 1036 1037 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1038 GFP_KERNEL); 1039 if (!urb->transfer_buffer) { 1040 dev_err(&port->dev, 1041 "%s-out of memory for urb buffers.\n", 1042 __func__); 1043 usb_free_urb(mos7720_port->write_urb_pool[j]); 1044 mos7720_port->write_urb_pool[j] = NULL; 1045 continue; 1046 } 1047 allocated_urbs++; 1048 } 1049 1050 if (!allocated_urbs) 1051 return -ENOMEM; 1052 1053 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1054 * 1055 * Register Index 1056 * 0 : THR/RHR 1057 * 1 : IER 1058 * 2 : FCR 1059 * 3 : LCR 1060 * 4 : MCR 1061 * 5 : LSR 1062 * 6 : MSR 1063 * 7 : SPR 1064 * 1065 * 0x08 : SP1/2 Control Reg 1066 */ 1067 port_number = port->number - port->serial->minor; 1068 read_mos_reg(serial, port_number, LSR, &data); 1069 1070 dbg("SS::%p LSR:%x", mos7720_port, data); 1071 1072 dbg("Check:Sending Command .........."); 1073 1074 write_mos_reg(serial, dummy, SP1_REG, 0x02); 1075 write_mos_reg(serial, dummy, SP2_REG, 0x02); 1076 1077 write_mos_reg(serial, port_number, IER, 0x00); 1078 write_mos_reg(serial, port_number, FCR, 0x00); 1079 1080 write_mos_reg(serial, port_number, FCR, 0xcf); 1081 mos7720_port->shadowLCR = 0x03; 1082 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1083 mos7720_port->shadowMCR = 0x0b; 1084 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1085 1086 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00); 1087 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data); 1088 data = data | (port->number - port->serial->minor + 1); 1089 write_mos_reg(serial, dummy, SP_CONTROL_REG, data); 1090 mos7720_port->shadowLCR = 0x83; 1091 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1092 write_mos_reg(serial, port_number, THR, 0x0c); 1093 write_mos_reg(serial, port_number, IER, 0x00); 1094 mos7720_port->shadowLCR = 0x03; 1095 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1096 write_mos_reg(serial, port_number, IER, 0x0c); 1097 1098 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1099 if (response) 1100 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1101 __func__, response); 1102 1103 /* initialize our icount structure */ 1104 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount)); 1105 1106 /* initialize our port settings */ 1107 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1108 1109 /* send a open port command */ 1110 mos7720_port->open = 1; 1111 1112 return 0; 1113 } 1114 1115 /* 1116 * mos7720_chars_in_buffer 1117 * this function is called by the tty driver when it wants to know how many 1118 * bytes of data we currently have outstanding in the port (data that has 1119 * been written, but hasn't made it out the port yet) 1120 * If successful, we return the number of bytes left to be written in the 1121 * system, 1122 * Otherwise we return a negative error number. 1123 */ 1124 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1125 { 1126 struct usb_serial_port *port = tty->driver_data; 1127 int i; 1128 int chars = 0; 1129 struct moschip_port *mos7720_port; 1130 1131 dbg("%s:entering ...........", __func__); 1132 1133 mos7720_port = usb_get_serial_port_data(port); 1134 if (mos7720_port == NULL) { 1135 dbg("%s:leaving ...........", __func__); 1136 return 0; 1137 } 1138 1139 for (i = 0; i < NUM_URBS; ++i) { 1140 if (mos7720_port->write_urb_pool[i] && 1141 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1142 chars += URB_TRANSFER_BUFFER_SIZE; 1143 } 1144 dbg("%s - returns %d", __func__, chars); 1145 return chars; 1146 } 1147 1148 static void mos7720_close(struct usb_serial_port *port) 1149 { 1150 struct usb_serial *serial; 1151 struct moschip_port *mos7720_port; 1152 int j; 1153 1154 dbg("mos7720_close:entering..."); 1155 1156 serial = port->serial; 1157 1158 mos7720_port = usb_get_serial_port_data(port); 1159 if (mos7720_port == NULL) 1160 return; 1161 1162 for (j = 0; j < NUM_URBS; ++j) 1163 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1164 1165 /* Freeing Write URBs */ 1166 for (j = 0; j < NUM_URBS; ++j) { 1167 if (mos7720_port->write_urb_pool[j]) { 1168 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1169 usb_free_urb(mos7720_port->write_urb_pool[j]); 1170 } 1171 } 1172 1173 /* While closing port, shutdown all bulk read, write * 1174 * and interrupt read if they exists, otherwise nop */ 1175 dbg("Shutdown bulk write"); 1176 usb_kill_urb(port->write_urb); 1177 dbg("Shutdown bulk read"); 1178 usb_kill_urb(port->read_urb); 1179 1180 mutex_lock(&serial->disc_mutex); 1181 /* these commands must not be issued if the device has 1182 * been disconnected */ 1183 if (!serial->disconnected) { 1184 write_mos_reg(serial, port->number - port->serial->minor, 1185 MCR, 0x00); 1186 write_mos_reg(serial, port->number - port->serial->minor, 1187 IER, 0x00); 1188 } 1189 mutex_unlock(&serial->disc_mutex); 1190 mos7720_port->open = 0; 1191 1192 dbg("Leaving %s", __func__); 1193 } 1194 1195 static void mos7720_break(struct tty_struct *tty, int break_state) 1196 { 1197 struct usb_serial_port *port = tty->driver_data; 1198 unsigned char data; 1199 struct usb_serial *serial; 1200 struct moschip_port *mos7720_port; 1201 1202 dbg("Entering %s", __func__); 1203 1204 serial = port->serial; 1205 1206 mos7720_port = usb_get_serial_port_data(port); 1207 if (mos7720_port == NULL) 1208 return; 1209 1210 if (break_state == -1) 1211 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1212 else 1213 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1214 1215 mos7720_port->shadowLCR = data; 1216 write_mos_reg(serial, port->number - port->serial->minor, 1217 LCR, mos7720_port->shadowLCR); 1218 } 1219 1220 /* 1221 * mos7720_write_room 1222 * this function is called by the tty driver when it wants to know how many 1223 * bytes of data we can accept for a specific port. 1224 * If successful, we return the amount of room that we have for this port 1225 * Otherwise we return a negative error number. 1226 */ 1227 static int mos7720_write_room(struct tty_struct *tty) 1228 { 1229 struct usb_serial_port *port = tty->driver_data; 1230 struct moschip_port *mos7720_port; 1231 int room = 0; 1232 int i; 1233 1234 dbg("%s:entering ...........", __func__); 1235 1236 mos7720_port = usb_get_serial_port_data(port); 1237 if (mos7720_port == NULL) { 1238 dbg("%s:leaving ...........", __func__); 1239 return -ENODEV; 1240 } 1241 1242 /* FIXME: Locking */ 1243 for (i = 0; i < NUM_URBS; ++i) { 1244 if (mos7720_port->write_urb_pool[i] && 1245 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1246 room += URB_TRANSFER_BUFFER_SIZE; 1247 } 1248 1249 dbg("%s - returns %d", __func__, room); 1250 return room; 1251 } 1252 1253 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1254 const unsigned char *data, int count) 1255 { 1256 int status; 1257 int i; 1258 int bytes_sent = 0; 1259 int transfer_size; 1260 1261 struct moschip_port *mos7720_port; 1262 struct usb_serial *serial; 1263 struct urb *urb; 1264 const unsigned char *current_position = data; 1265 1266 dbg("%s:entering ...........", __func__); 1267 1268 serial = port->serial; 1269 1270 mos7720_port = usb_get_serial_port_data(port); 1271 if (mos7720_port == NULL) { 1272 dbg("mos7720_port is NULL"); 1273 return -ENODEV; 1274 } 1275 1276 /* try to find a free urb in the list */ 1277 urb = NULL; 1278 1279 for (i = 0; i < NUM_URBS; ++i) { 1280 if (mos7720_port->write_urb_pool[i] && 1281 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1282 urb = mos7720_port->write_urb_pool[i]; 1283 dbg("URB:%d", i); 1284 break; 1285 } 1286 } 1287 1288 if (urb == NULL) { 1289 dbg("%s - no more free urbs", __func__); 1290 goto exit; 1291 } 1292 1293 if (urb->transfer_buffer == NULL) { 1294 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1295 GFP_KERNEL); 1296 if (urb->transfer_buffer == NULL) { 1297 dev_err_console(port, "%s no more kernel memory...\n", 1298 __func__); 1299 goto exit; 1300 } 1301 } 1302 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1303 1304 memcpy(urb->transfer_buffer, current_position, transfer_size); 1305 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size, 1306 urb->transfer_buffer); 1307 1308 /* fill urb with data and submit */ 1309 usb_fill_bulk_urb(urb, serial->dev, 1310 usb_sndbulkpipe(serial->dev, 1311 port->bulk_out_endpointAddress), 1312 urb->transfer_buffer, transfer_size, 1313 mos7720_bulk_out_data_callback, mos7720_port); 1314 1315 /* send it down the pipe */ 1316 status = usb_submit_urb(urb, GFP_ATOMIC); 1317 if (status) { 1318 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1319 "with status = %d\n", __func__, status); 1320 bytes_sent = status; 1321 goto exit; 1322 } 1323 bytes_sent = transfer_size; 1324 1325 exit: 1326 return bytes_sent; 1327 } 1328 1329 static void mos7720_throttle(struct tty_struct *tty) 1330 { 1331 struct usb_serial_port *port = tty->driver_data; 1332 struct moschip_port *mos7720_port; 1333 int status; 1334 1335 dbg("%s- port %d", __func__, port->number); 1336 1337 mos7720_port = usb_get_serial_port_data(port); 1338 1339 if (mos7720_port == NULL) 1340 return; 1341 1342 if (!mos7720_port->open) { 1343 dbg("port not opened"); 1344 return; 1345 } 1346 1347 dbg("%s: Entering ..........", __func__); 1348 1349 /* if we are implementing XON/XOFF, send the stop character */ 1350 if (I_IXOFF(tty)) { 1351 unsigned char stop_char = STOP_CHAR(tty); 1352 status = mos7720_write(tty, port, &stop_char, 1); 1353 if (status <= 0) 1354 return; 1355 } 1356 1357 /* if we are implementing RTS/CTS, toggle that line */ 1358 if (tty->termios->c_cflag & CRTSCTS) { 1359 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1360 write_mos_reg(port->serial, port->number - port->serial->minor, 1361 MCR, mos7720_port->shadowMCR); 1362 if (status != 0) 1363 return; 1364 } 1365 } 1366 1367 static void mos7720_unthrottle(struct tty_struct *tty) 1368 { 1369 struct usb_serial_port *port = tty->driver_data; 1370 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1371 int status; 1372 1373 if (mos7720_port == NULL) 1374 return; 1375 1376 if (!mos7720_port->open) { 1377 dbg("%s - port not opened", __func__); 1378 return; 1379 } 1380 1381 dbg("%s: Entering ..........", __func__); 1382 1383 /* if we are implementing XON/XOFF, send the start character */ 1384 if (I_IXOFF(tty)) { 1385 unsigned char start_char = START_CHAR(tty); 1386 status = mos7720_write(tty, port, &start_char, 1); 1387 if (status <= 0) 1388 return; 1389 } 1390 1391 /* if we are implementing RTS/CTS, toggle that line */ 1392 if (tty->termios->c_cflag & CRTSCTS) { 1393 mos7720_port->shadowMCR |= UART_MCR_RTS; 1394 write_mos_reg(port->serial, port->number - port->serial->minor, 1395 MCR, mos7720_port->shadowMCR); 1396 if (status != 0) 1397 return; 1398 } 1399 } 1400 1401 /* FIXME: this function does not work */ 1402 static int set_higher_rates(struct moschip_port *mos7720_port, 1403 unsigned int baud) 1404 { 1405 struct usb_serial_port *port; 1406 struct usb_serial *serial; 1407 int port_number; 1408 enum mos_regs sp_reg; 1409 if (mos7720_port == NULL) 1410 return -EINVAL; 1411 1412 port = mos7720_port->port; 1413 serial = port->serial; 1414 1415 /*********************************************** 1416 * Init Sequence for higher rates 1417 ***********************************************/ 1418 dbg("Sending Setting Commands .........."); 1419 port_number = port->number - port->serial->minor; 1420 1421 write_mos_reg(serial, port_number, IER, 0x00); 1422 write_mos_reg(serial, port_number, FCR, 0x00); 1423 write_mos_reg(serial, port_number, FCR, 0xcf); 1424 mos7720_port->shadowMCR = 0x0b; 1425 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1426 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00); 1427 1428 /*********************************************** 1429 * Set for higher rates * 1430 ***********************************************/ 1431 /* writing baud rate verbatum into uart clock field clearly not right */ 1432 if (port_number == 0) 1433 sp_reg = SP1_REG; 1434 else 1435 sp_reg = SP2_REG; 1436 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1437 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03); 1438 mos7720_port->shadowMCR = 0x2b; 1439 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1440 1441 /*********************************************** 1442 * Set DLL/DLM 1443 ***********************************************/ 1444 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1445 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1446 write_mos_reg(serial, port_number, DLL, 0x01); 1447 write_mos_reg(serial, port_number, DLM, 0x00); 1448 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1449 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1450 1451 return 0; 1452 } 1453 1454 /* baud rate information */ 1455 struct divisor_table_entry { 1456 __u32 baudrate; 1457 __u16 divisor; 1458 }; 1459 1460 /* Define table of divisors for moschip 7720 hardware * 1461 * These assume a 3.6864MHz crystal, the standard /16, and * 1462 * MCR.7 = 0. */ 1463 static struct divisor_table_entry divisor_table[] = { 1464 { 50, 2304}, 1465 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1466 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1467 { 150, 768}, 1468 { 300, 384}, 1469 { 600, 192}, 1470 { 1200, 96}, 1471 { 1800, 64}, 1472 { 2400, 48}, 1473 { 4800, 24}, 1474 { 7200, 16}, 1475 { 9600, 12}, 1476 { 19200, 6}, 1477 { 38400, 3}, 1478 { 57600, 2}, 1479 { 115200, 1}, 1480 }; 1481 1482 /***************************************************************************** 1483 * calc_baud_rate_divisor 1484 * this function calculates the proper baud rate divisor for the specified 1485 * baud rate. 1486 *****************************************************************************/ 1487 static int calc_baud_rate_divisor(int baudrate, int *divisor) 1488 { 1489 int i; 1490 __u16 custom; 1491 __u16 round1; 1492 __u16 round; 1493 1494 1495 dbg("%s - %d", __func__, baudrate); 1496 1497 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1498 if (divisor_table[i].baudrate == baudrate) { 1499 *divisor = divisor_table[i].divisor; 1500 return 0; 1501 } 1502 } 1503 1504 /* After trying for all the standard baud rates * 1505 * Try calculating the divisor for this baud rate */ 1506 if (baudrate > 75 && baudrate < 230400) { 1507 /* get the divisor */ 1508 custom = (__u16)(230400L / baudrate); 1509 1510 /* Check for round off */ 1511 round1 = (__u16)(2304000L / baudrate); 1512 round = (__u16)(round1 - (custom * 10)); 1513 if (round > 4) 1514 custom++; 1515 *divisor = custom; 1516 1517 dbg("Baud %d = %d", baudrate, custom); 1518 return 0; 1519 } 1520 1521 dbg("Baud calculation Failed..."); 1522 return -EINVAL; 1523 } 1524 1525 /* 1526 * send_cmd_write_baud_rate 1527 * this function sends the proper command to change the baud rate of the 1528 * specified port. 1529 */ 1530 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1531 int baudrate) 1532 { 1533 struct usb_serial_port *port; 1534 struct usb_serial *serial; 1535 int divisor; 1536 int status; 1537 unsigned char number; 1538 1539 if (mos7720_port == NULL) 1540 return -1; 1541 1542 port = mos7720_port->port; 1543 serial = port->serial; 1544 1545 dbg("%s: Entering ..........", __func__); 1546 1547 number = port->number - port->serial->minor; 1548 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate); 1549 1550 /* Calculate the Divisor */ 1551 status = calc_baud_rate_divisor(baudrate, &divisor); 1552 if (status) { 1553 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1554 return status; 1555 } 1556 1557 /* Enable access to divisor latch */ 1558 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1559 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1560 1561 /* Write the divisor */ 1562 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff)); 1563 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8)); 1564 1565 /* Disable access to divisor latch */ 1566 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1567 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR); 1568 1569 return status; 1570 } 1571 1572 /* 1573 * change_port_settings 1574 * This routine is called to set the UART on the device to match 1575 * the specified new settings. 1576 */ 1577 static void change_port_settings(struct tty_struct *tty, 1578 struct moschip_port *mos7720_port, 1579 struct ktermios *old_termios) 1580 { 1581 struct usb_serial_port *port; 1582 struct usb_serial *serial; 1583 int baud; 1584 unsigned cflag; 1585 unsigned iflag; 1586 __u8 mask = 0xff; 1587 __u8 lData; 1588 __u8 lParity; 1589 __u8 lStop; 1590 int status; 1591 int port_number; 1592 1593 if (mos7720_port == NULL) 1594 return ; 1595 1596 port = mos7720_port->port; 1597 serial = port->serial; 1598 port_number = port->number - port->serial->minor; 1599 1600 dbg("%s - port %d", __func__, port->number); 1601 1602 if (!mos7720_port->open) { 1603 dbg("%s - port not opened", __func__); 1604 return; 1605 } 1606 1607 dbg("%s: Entering ..........", __func__); 1608 1609 lData = UART_LCR_WLEN8; 1610 lStop = 0x00; /* 1 stop bit */ 1611 lParity = 0x00; /* No parity */ 1612 1613 cflag = tty->termios->c_cflag; 1614 iflag = tty->termios->c_iflag; 1615 1616 /* Change the number of bits */ 1617 switch (cflag & CSIZE) { 1618 case CS5: 1619 lData = UART_LCR_WLEN5; 1620 mask = 0x1f; 1621 break; 1622 1623 case CS6: 1624 lData = UART_LCR_WLEN6; 1625 mask = 0x3f; 1626 break; 1627 1628 case CS7: 1629 lData = UART_LCR_WLEN7; 1630 mask = 0x7f; 1631 break; 1632 default: 1633 case CS8: 1634 lData = UART_LCR_WLEN8; 1635 break; 1636 } 1637 1638 /* Change the Parity bit */ 1639 if (cflag & PARENB) { 1640 if (cflag & PARODD) { 1641 lParity = UART_LCR_PARITY; 1642 dbg("%s - parity = odd", __func__); 1643 } else { 1644 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1645 dbg("%s - parity = even", __func__); 1646 } 1647 1648 } else { 1649 dbg("%s - parity = none", __func__); 1650 } 1651 1652 if (cflag & CMSPAR) 1653 lParity = lParity | 0x20; 1654 1655 /* Change the Stop bit */ 1656 if (cflag & CSTOPB) { 1657 lStop = UART_LCR_STOP; 1658 dbg("%s - stop bits = 2", __func__); 1659 } else { 1660 lStop = 0x00; 1661 dbg("%s - stop bits = 1", __func__); 1662 } 1663 1664 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1665 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1666 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1667 1668 /* Update the LCR with the correct value */ 1669 mos7720_port->shadowLCR &= 1670 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1671 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1672 1673 1674 /* Disable Interrupts */ 1675 write_mos_reg(serial, port_number, IER, 0x00); 1676 write_mos_reg(serial, port_number, FCR, 0x00); 1677 write_mos_reg(serial, port_number, FCR, 0xcf); 1678 1679 /* Send the updated LCR value to the mos7720 */ 1680 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR); 1681 mos7720_port->shadowMCR = 0x0b; 1682 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1683 1684 /* set up the MCR register and send it to the mos7720 */ 1685 mos7720_port->shadowMCR = UART_MCR_OUT2; 1686 if (cflag & CBAUD) 1687 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1688 1689 if (cflag & CRTSCTS) { 1690 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1691 /* To set hardware flow control to the specified * 1692 * serial port, in SP1/2_CONTROL_REG */ 1693 if (port->number) 1694 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01); 1695 else 1696 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02); 1697 1698 } else 1699 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1700 1701 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR); 1702 1703 /* Determine divisor based on baud rate */ 1704 baud = tty_get_baud_rate(tty); 1705 if (!baud) { 1706 /* pick a default, any default... */ 1707 dbg("Picked default baud..."); 1708 baud = 9600; 1709 } 1710 1711 if (baud >= 230400) { 1712 set_higher_rates(mos7720_port, baud); 1713 /* Enable Interrupts */ 1714 write_mos_reg(serial, port_number, IER, 0x0c); 1715 return; 1716 } 1717 1718 dbg("%s - baud rate = %d", __func__, baud); 1719 status = send_cmd_write_baud_rate(mos7720_port, baud); 1720 /* FIXME: needs to write actual resulting baud back not just 1721 blindly do so */ 1722 if (cflag & CBAUD) 1723 tty_encode_baud_rate(tty, baud, baud); 1724 /* Enable Interrupts */ 1725 write_mos_reg(serial, port_number, IER, 0x0c); 1726 1727 if (port->read_urb->status != -EINPROGRESS) { 1728 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1729 if (status) 1730 dbg("usb_submit_urb(read bulk) failed, status = %d", 1731 status); 1732 } 1733 } 1734 1735 /* 1736 * mos7720_set_termios 1737 * this function is called by the tty driver when it wants to change the 1738 * termios structure. 1739 */ 1740 static void mos7720_set_termios(struct tty_struct *tty, 1741 struct usb_serial_port *port, struct ktermios *old_termios) 1742 { 1743 int status; 1744 unsigned int cflag; 1745 struct usb_serial *serial; 1746 struct moschip_port *mos7720_port; 1747 1748 serial = port->serial; 1749 1750 mos7720_port = usb_get_serial_port_data(port); 1751 1752 if (mos7720_port == NULL) 1753 return; 1754 1755 if (!mos7720_port->open) { 1756 dbg("%s - port not opened", __func__); 1757 return; 1758 } 1759 1760 dbg("%s\n", "setting termios - ASPIRE"); 1761 1762 cflag = tty->termios->c_cflag; 1763 1764 dbg("%s - cflag %08x iflag %08x", __func__, 1765 tty->termios->c_cflag, 1766 RELEVANT_IFLAG(tty->termios->c_iflag)); 1767 1768 dbg("%s - old cflag %08x old iflag %08x", __func__, 1769 old_termios->c_cflag, 1770 RELEVANT_IFLAG(old_termios->c_iflag)); 1771 1772 dbg("%s - port %d", __func__, port->number); 1773 1774 /* change the port settings to the new ones specified */ 1775 change_port_settings(tty, mos7720_port, old_termios); 1776 1777 if (port->read_urb->status != -EINPROGRESS) { 1778 status = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1779 if (status) 1780 dbg("usb_submit_urb(read bulk) failed, status = %d", 1781 status); 1782 } 1783 } 1784 1785 /* 1786 * get_lsr_info - get line status register info 1787 * 1788 * Purpose: Let user call ioctl() to get info when the UART physically 1789 * is emptied. On bus types like RS485, the transmitter must 1790 * release the bus after transmitting. This must be done when 1791 * the transmit shift register is empty, not be done when the 1792 * transmit holding register is empty. This functionality 1793 * allows an RS485 driver to be written in user space. 1794 */ 1795 static int get_lsr_info(struct tty_struct *tty, 1796 struct moschip_port *mos7720_port, unsigned int __user *value) 1797 { 1798 struct usb_serial_port *port = tty->driver_data; 1799 unsigned int result = 0; 1800 unsigned char data = 0; 1801 int port_number = port->number - port->serial->minor; 1802 int count; 1803 1804 count = mos7720_chars_in_buffer(tty); 1805 if (count == 0) { 1806 read_mos_reg(port->serial, port_number, LSR, &data); 1807 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1808 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1809 dbg("%s -- Empty", __func__); 1810 result = TIOCSER_TEMT; 1811 } 1812 } 1813 if (copy_to_user(value, &result, sizeof(int))) 1814 return -EFAULT; 1815 return 0; 1816 } 1817 1818 static int mos7720_tiocmget(struct tty_struct *tty) 1819 { 1820 struct usb_serial_port *port = tty->driver_data; 1821 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1822 unsigned int result = 0; 1823 unsigned int mcr ; 1824 unsigned int msr ; 1825 1826 dbg("%s - port %d", __func__, port->number); 1827 1828 mcr = mos7720_port->shadowMCR; 1829 msr = mos7720_port->shadowMSR; 1830 1831 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1832 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1833 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1834 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1835 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1836 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1837 1838 dbg("%s -- %x", __func__, result); 1839 1840 return result; 1841 } 1842 1843 static int mos7720_tiocmset(struct tty_struct *tty, 1844 unsigned int set, unsigned int clear) 1845 { 1846 struct usb_serial_port *port = tty->driver_data; 1847 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1848 unsigned int mcr ; 1849 dbg("%s - port %d", __func__, port->number); 1850 dbg("he was at tiocmset"); 1851 1852 mcr = mos7720_port->shadowMCR; 1853 1854 if (set & TIOCM_RTS) 1855 mcr |= UART_MCR_RTS; 1856 if (set & TIOCM_DTR) 1857 mcr |= UART_MCR_DTR; 1858 if (set & TIOCM_LOOP) 1859 mcr |= UART_MCR_LOOP; 1860 1861 if (clear & TIOCM_RTS) 1862 mcr &= ~UART_MCR_RTS; 1863 if (clear & TIOCM_DTR) 1864 mcr &= ~UART_MCR_DTR; 1865 if (clear & TIOCM_LOOP) 1866 mcr &= ~UART_MCR_LOOP; 1867 1868 mos7720_port->shadowMCR = mcr; 1869 write_mos_reg(port->serial, port->number - port->serial->minor, 1870 MCR, mos7720_port->shadowMCR); 1871 1872 return 0; 1873 } 1874 1875 static int mos7720_get_icount(struct tty_struct *tty, 1876 struct serial_icounter_struct *icount) 1877 { 1878 struct usb_serial_port *port = tty->driver_data; 1879 struct moschip_port *mos7720_port; 1880 struct async_icount cnow; 1881 1882 mos7720_port = usb_get_serial_port_data(port); 1883 cnow = mos7720_port->icount; 1884 1885 icount->cts = cnow.cts; 1886 icount->dsr = cnow.dsr; 1887 icount->rng = cnow.rng; 1888 icount->dcd = cnow.dcd; 1889 icount->rx = cnow.rx; 1890 icount->tx = cnow.tx; 1891 icount->frame = cnow.frame; 1892 icount->overrun = cnow.overrun; 1893 icount->parity = cnow.parity; 1894 icount->brk = cnow.brk; 1895 icount->buf_overrun = cnow.buf_overrun; 1896 1897 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, 1898 port->number, icount->rx, icount->tx); 1899 return 0; 1900 } 1901 1902 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1903 unsigned int __user *value) 1904 { 1905 unsigned int mcr; 1906 unsigned int arg; 1907 1908 struct usb_serial_port *port; 1909 1910 if (mos7720_port == NULL) 1911 return -1; 1912 1913 port = (struct usb_serial_port *)mos7720_port->port; 1914 mcr = mos7720_port->shadowMCR; 1915 1916 if (copy_from_user(&arg, value, sizeof(int))) 1917 return -EFAULT; 1918 1919 switch (cmd) { 1920 case TIOCMBIS: 1921 if (arg & TIOCM_RTS) 1922 mcr |= UART_MCR_RTS; 1923 if (arg & TIOCM_DTR) 1924 mcr |= UART_MCR_RTS; 1925 if (arg & TIOCM_LOOP) 1926 mcr |= UART_MCR_LOOP; 1927 break; 1928 1929 case TIOCMBIC: 1930 if (arg & TIOCM_RTS) 1931 mcr &= ~UART_MCR_RTS; 1932 if (arg & TIOCM_DTR) 1933 mcr &= ~UART_MCR_RTS; 1934 if (arg & TIOCM_LOOP) 1935 mcr &= ~UART_MCR_LOOP; 1936 break; 1937 1938 } 1939 1940 mos7720_port->shadowMCR = mcr; 1941 write_mos_reg(port->serial, port->number - port->serial->minor, 1942 MCR, mos7720_port->shadowMCR); 1943 1944 return 0; 1945 } 1946 1947 static int get_serial_info(struct moschip_port *mos7720_port, 1948 struct serial_struct __user *retinfo) 1949 { 1950 struct serial_struct tmp; 1951 1952 if (!retinfo) 1953 return -EFAULT; 1954 1955 memset(&tmp, 0, sizeof(tmp)); 1956 1957 tmp.type = PORT_16550A; 1958 tmp.line = mos7720_port->port->serial->minor; 1959 tmp.port = mos7720_port->port->number; 1960 tmp.irq = 0; 1961 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1962 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1963 tmp.baud_base = 9600; 1964 tmp.close_delay = 5*HZ; 1965 tmp.closing_wait = 30*HZ; 1966 1967 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1968 return -EFAULT; 1969 return 0; 1970 } 1971 1972 static int mos7720_ioctl(struct tty_struct *tty, 1973 unsigned int cmd, unsigned long arg) 1974 { 1975 struct usb_serial_port *port = tty->driver_data; 1976 struct moschip_port *mos7720_port; 1977 struct async_icount cnow; 1978 struct async_icount cprev; 1979 1980 mos7720_port = usb_get_serial_port_data(port); 1981 if (mos7720_port == NULL) 1982 return -ENODEV; 1983 1984 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); 1985 1986 switch (cmd) { 1987 case TIOCSERGETLSR: 1988 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number); 1989 return get_lsr_info(tty, mos7720_port, 1990 (unsigned int __user *)arg); 1991 1992 /* FIXME: These should be using the mode methods */ 1993 case TIOCMBIS: 1994 case TIOCMBIC: 1995 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", 1996 __func__, port->number); 1997 return set_modem_info(mos7720_port, cmd, 1998 (unsigned int __user *)arg); 1999 2000 case TIOCGSERIAL: 2001 dbg("%s (%d) TIOCGSERIAL", __func__, port->number); 2002 return get_serial_info(mos7720_port, 2003 (struct serial_struct __user *)arg); 2004 2005 case TIOCMIWAIT: 2006 dbg("%s (%d) TIOCMIWAIT", __func__, port->number); 2007 cprev = mos7720_port->icount; 2008 while (1) { 2009 if (signal_pending(current)) 2010 return -ERESTARTSYS; 2011 cnow = mos7720_port->icount; 2012 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 2013 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 2014 return -EIO; /* no change => error */ 2015 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 2016 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 2017 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 2018 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 2019 return 0; 2020 } 2021 cprev = cnow; 2022 } 2023 /* NOTREACHED */ 2024 break; 2025 } 2026 2027 return -ENOIOCTLCMD; 2028 } 2029 2030 static int mos7720_startup(struct usb_serial *serial) 2031 { 2032 struct moschip_port *mos7720_port; 2033 struct usb_device *dev; 2034 int i; 2035 char data; 2036 u16 product; 2037 int ret_val; 2038 2039 dbg("%s: Entering ..........", __func__); 2040 2041 if (!serial) { 2042 dbg("Invalid Handler"); 2043 return -ENODEV; 2044 } 2045 2046 product = le16_to_cpu(serial->dev->descriptor.idProduct); 2047 dev = serial->dev; 2048 2049 /* 2050 * The 7715 uses the first bulk in/out endpoint pair for the parallel 2051 * port, and the second for the serial port. Because the usbserial core 2052 * assumes both pairs are serial ports, we must engage in a bit of 2053 * subterfuge and swap the pointers for ports 0 and 1 in order to make 2054 * port 0 point to the serial port. However, both moschip devices use a 2055 * single interrupt-in endpoint for both ports (as mentioned a little 2056 * further down), and this endpoint was assigned to port 0. So after 2057 * the swap, we must copy the interrupt endpoint elements from port 1 2058 * (as newly assigned) to port 0, and null out port 1 pointers. 2059 */ 2060 if (product == MOSCHIP_DEVICE_ID_7715) { 2061 struct usb_serial_port *tmp = serial->port[0]; 2062 serial->port[0] = serial->port[1]; 2063 serial->port[1] = tmp; 2064 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 2065 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 2066 serial->port[0]->interrupt_in_endpointAddress = 2067 tmp->interrupt_in_endpointAddress; 2068 serial->port[1]->interrupt_in_urb = NULL; 2069 serial->port[1]->interrupt_in_buffer = NULL; 2070 } 2071 2072 2073 /* set up serial port private structures */ 2074 for (i = 0; i < serial->num_ports; ++i) { 2075 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2076 if (mos7720_port == NULL) { 2077 dev_err(&dev->dev, "%s - Out of memory\n", __func__); 2078 return -ENOMEM; 2079 } 2080 2081 /* Initialize all port interrupt end point to port 0 int 2082 * endpoint. Our device has only one interrupt endpoint 2083 * common to all ports */ 2084 serial->port[i]->interrupt_in_endpointAddress = 2085 serial->port[0]->interrupt_in_endpointAddress; 2086 2087 mos7720_port->port = serial->port[i]; 2088 usb_set_serial_port_data(serial->port[i], mos7720_port); 2089 2090 dbg("port number is %d", serial->port[i]->number); 2091 dbg("serial number is %d", serial->minor); 2092 } 2093 2094 2095 /* setting configuration feature to one */ 2096 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2097 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ); 2098 2099 /* start the interrupt urb */ 2100 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 2101 if (ret_val) 2102 dev_err(&dev->dev, 2103 "%s - Error %d submitting control urb\n", 2104 __func__, ret_val); 2105 2106 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2107 if (product == MOSCHIP_DEVICE_ID_7715) { 2108 ret_val = mos7715_parport_init(serial); 2109 if (ret_val < 0) 2110 return ret_val; 2111 } 2112 #endif 2113 /* LSR For Port 1 */ 2114 read_mos_reg(serial, 0, LSR, &data); 2115 dbg("LSR:%x", data); 2116 2117 return 0; 2118 } 2119 2120 static void mos7720_release(struct usb_serial *serial) 2121 { 2122 int i; 2123 2124 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 2125 /* close the parallel port */ 2126 2127 if (le16_to_cpu(serial->dev->descriptor.idProduct) 2128 == MOSCHIP_DEVICE_ID_7715) { 2129 struct urbtracker *urbtrack; 2130 unsigned long flags; 2131 struct mos7715_parport *mos_parport = 2132 usb_get_serial_data(serial); 2133 2134 /* prevent NULL ptr dereference in port callbacks */ 2135 spin_lock(&release_lock); 2136 mos_parport->pp->private_data = NULL; 2137 spin_unlock(&release_lock); 2138 2139 /* wait for synchronous usb calls to return */ 2140 if (mos_parport->msg_pending) 2141 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 2142 MOS_WDR_TIMEOUT); 2143 2144 parport_remove_port(mos_parport->pp); 2145 usb_set_serial_data(serial, NULL); 2146 mos_parport->serial = NULL; 2147 2148 /* if tasklet currently scheduled, wait for it to complete */ 2149 tasklet_kill(&mos_parport->urb_tasklet); 2150 2151 /* unlink any urbs sent by the tasklet */ 2152 spin_lock_irqsave(&mos_parport->listlock, flags); 2153 list_for_each_entry(urbtrack, 2154 &mos_parport->active_urbs, 2155 urblist_entry) 2156 usb_unlink_urb(urbtrack->urb); 2157 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2158 2159 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2160 } 2161 #endif 2162 /* free private structure allocated for serial port */ 2163 for (i = 0; i < serial->num_ports; ++i) 2164 kfree(usb_get_serial_port_data(serial->port[i])); 2165 } 2166 2167 static struct usb_driver usb_driver = { 2168 .name = "moschip7720", 2169 .probe = usb_serial_probe, 2170 .disconnect = usb_serial_disconnect, 2171 .id_table = moschip_port_id_table, 2172 }; 2173 2174 static struct usb_serial_driver moschip7720_2port_driver = { 2175 .driver = { 2176 .owner = THIS_MODULE, 2177 .name = "moschip7720", 2178 }, 2179 .description = "Moschip 2 port adapter", 2180 .id_table = moschip_port_id_table, 2181 .calc_num_ports = mos77xx_calc_num_ports, 2182 .open = mos7720_open, 2183 .close = mos7720_close, 2184 .throttle = mos7720_throttle, 2185 .unthrottle = mos7720_unthrottle, 2186 .probe = mos77xx_probe, 2187 .attach = mos7720_startup, 2188 .release = mos7720_release, 2189 .ioctl = mos7720_ioctl, 2190 .tiocmget = mos7720_tiocmget, 2191 .tiocmset = mos7720_tiocmset, 2192 .get_icount = mos7720_get_icount, 2193 .set_termios = mos7720_set_termios, 2194 .write = mos7720_write, 2195 .write_room = mos7720_write_room, 2196 .chars_in_buffer = mos7720_chars_in_buffer, 2197 .break_ctl = mos7720_break, 2198 .read_bulk_callback = mos7720_bulk_in_callback, 2199 .read_int_callback = NULL /* dynamically assigned in probe() */ 2200 }; 2201 2202 static struct usb_serial_driver * const serial_drivers[] = { 2203 &moschip7720_2port_driver, NULL 2204 }; 2205 2206 module_usb_serial_driver(usb_driver, serial_drivers); 2207 2208 MODULE_AUTHOR(DRIVER_AUTHOR); 2209 MODULE_DESCRIPTION(DRIVER_DESC); 2210 MODULE_LICENSE("GPL"); 2211 2212 module_param(debug, bool, S_IRUGO | S_IWUSR); 2213 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2214