1 /* 2 * mos7720.c 3 * Controls the Moschip 7720 usb to dual port serial converter 4 * 5 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, version 2 of the License. 10 * 11 * Developed by: 12 * Vijaya Kumar <vijaykumar.gn@gmail.com> 13 * Ajay Kumar <naanuajay@yahoo.com> 14 * Gurudeva <ngurudeva@yahoo.com> 15 * 16 * Cleaned up from the original by: 17 * Greg Kroah-Hartman <gregkh@suse.de> 18 * 19 * Originally based on drivers/usb/serial/io_edgeport.c which is: 20 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 22 */ 23 #include <linux/kernel.h> 24 #include <linux/errno.h> 25 #include <linux/slab.h> 26 #include <linux/tty.h> 27 #include <linux/tty_driver.h> 28 #include <linux/tty_flip.h> 29 #include <linux/module.h> 30 #include <linux/spinlock.h> 31 #include <linux/serial.h> 32 #include <linux/serial_reg.h> 33 #include <linux/usb.h> 34 #include <linux/usb/serial.h> 35 #include <linux/uaccess.h> 36 #include <linux/parport.h> 37 38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 39 #define DRIVER_DESC "Moschip USB Serial Driver" 40 41 /* default urb timeout */ 42 #define MOS_WDR_TIMEOUT 5000 43 44 #define MOS_MAX_PORT 0x02 45 #define MOS_WRITE 0x0E 46 #define MOS_READ 0x0D 47 48 /* Interrupt Routines Defines */ 49 #define SERIAL_IIR_RLS 0x06 50 #define SERIAL_IIR_RDA 0x04 51 #define SERIAL_IIR_CTI 0x0c 52 #define SERIAL_IIR_THR 0x02 53 #define SERIAL_IIR_MS 0x00 54 55 #define NUM_URBS 16 /* URB Count */ 56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 57 58 /* This structure holds all of the local serial port information */ 59 struct moschip_port { 60 __u8 shadowLCR; /* last LCR value received */ 61 __u8 shadowMCR; /* last MCR value received */ 62 __u8 shadowMSR; /* last MSR value received */ 63 char open; 64 struct usb_serial_port *port; /* loop back to the owner */ 65 struct urb *write_urb_pool[NUM_URBS]; 66 }; 67 68 static struct usb_serial_driver moschip7720_2port_driver; 69 70 #define USB_VENDOR_ID_MOSCHIP 0x9710 71 #define MOSCHIP_DEVICE_ID_7720 0x7720 72 #define MOSCHIP_DEVICE_ID_7715 0x7715 73 74 static const struct usb_device_id id_table[] = { 75 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 77 { } /* terminating entry */ 78 }; 79 MODULE_DEVICE_TABLE(usb, id_table); 80 81 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 82 83 /* initial values for parport regs */ 84 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 85 #define ECR_INIT_VAL 0x00 /* SPP mode */ 86 87 struct urbtracker { 88 struct mos7715_parport *mos_parport; 89 struct list_head urblist_entry; 90 struct kref ref_count; 91 struct urb *urb; 92 struct usb_ctrlrequest *setup; 93 }; 94 95 enum mos7715_pp_modes { 96 SPP = 0<<5, 97 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 98 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 99 }; 100 101 struct mos7715_parport { 102 struct parport *pp; /* back to containing struct */ 103 struct kref ref_count; /* to instance of this struct */ 104 struct list_head deferred_urbs; /* list deferred async urbs */ 105 struct list_head active_urbs; /* list async urbs in flight */ 106 spinlock_t listlock; /* protects list access */ 107 bool msg_pending; /* usb sync call pending */ 108 struct completion syncmsg_compl; /* usb sync call completed */ 109 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */ 110 struct usb_serial *serial; /* back to containing struct */ 111 __u8 shadowECR; /* parallel port regs... */ 112 __u8 shadowDCR; 113 atomic_t shadowDSR; /* updated in int-in callback */ 114 }; 115 116 /* lock guards against dereferencing NULL ptr in parport ops callbacks */ 117 static DEFINE_SPINLOCK(release_lock); 118 119 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 120 121 static const unsigned int dummy; /* for clarity in register access fns */ 122 123 enum mos_regs { 124 MOS7720_THR, /* serial port regs */ 125 MOS7720_RHR, 126 MOS7720_IER, 127 MOS7720_FCR, 128 MOS7720_ISR, 129 MOS7720_LCR, 130 MOS7720_MCR, 131 MOS7720_LSR, 132 MOS7720_MSR, 133 MOS7720_SPR, 134 MOS7720_DLL, 135 MOS7720_DLM, 136 MOS7720_DPR, /* parallel port regs */ 137 MOS7720_DSR, 138 MOS7720_DCR, 139 MOS7720_ECR, 140 MOS7720_SP1_REG, /* device control regs */ 141 MOS7720_SP2_REG, /* serial port 2 (7720 only) */ 142 MOS7720_PP_REG, 143 MOS7720_SP_CONTROL_REG, 144 }; 145 146 /* 147 * Return the correct value for the Windex field of the setup packet 148 * for a control endpoint message. See the 7715 datasheet. 149 */ 150 static inline __u16 get_reg_index(enum mos_regs reg) 151 { 152 static const __u16 mos7715_index_lookup_table[] = { 153 0x00, /* MOS7720_THR */ 154 0x00, /* MOS7720_RHR */ 155 0x01, /* MOS7720_IER */ 156 0x02, /* MOS7720_FCR */ 157 0x02, /* MOS7720_ISR */ 158 0x03, /* MOS7720_LCR */ 159 0x04, /* MOS7720_MCR */ 160 0x05, /* MOS7720_LSR */ 161 0x06, /* MOS7720_MSR */ 162 0x07, /* MOS7720_SPR */ 163 0x00, /* MOS7720_DLL */ 164 0x01, /* MOS7720_DLM */ 165 0x00, /* MOS7720_DPR */ 166 0x01, /* MOS7720_DSR */ 167 0x02, /* MOS7720_DCR */ 168 0x0a, /* MOS7720_ECR */ 169 0x01, /* MOS7720_SP1_REG */ 170 0x02, /* MOS7720_SP2_REG (7720 only) */ 171 0x04, /* MOS7720_PP_REG (7715 only) */ 172 0x08, /* MOS7720_SP_CONTROL_REG */ 173 }; 174 return mos7715_index_lookup_table[reg]; 175 } 176 177 /* 178 * Return the correct value for the upper byte of the Wvalue field of 179 * the setup packet for a control endpoint message. 180 */ 181 static inline __u16 get_reg_value(enum mos_regs reg, 182 unsigned int serial_portnum) 183 { 184 if (reg >= MOS7720_SP1_REG) /* control reg */ 185 return 0x0000; 186 187 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */ 188 return 0x0100; 189 190 else /* serial port reg */ 191 return (serial_portnum + 2) << 8; 192 } 193 194 /* 195 * Write data byte to the specified device register. The data is embedded in 196 * the value field of the setup packet. serial_portnum is ignored for registers 197 * not specific to a particular serial port. 198 */ 199 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 200 enum mos_regs reg, __u8 data) 201 { 202 struct usb_device *usbdev = serial->dev; 203 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 204 __u8 request = (__u8)0x0e; 205 __u8 requesttype = (__u8)0x40; 206 __u16 index = get_reg_index(reg); 207 __u16 value = get_reg_value(reg, serial_portnum) + data; 208 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 209 index, NULL, 0, MOS_WDR_TIMEOUT); 210 if (status < 0) 211 dev_err(&usbdev->dev, 212 "mos7720: usb_control_msg() failed: %d\n", status); 213 return status; 214 } 215 216 /* 217 * Read data byte from the specified device register. The data returned by the 218 * device is embedded in the value field of the setup packet. serial_portnum is 219 * ignored for registers that are not specific to a particular serial port. 220 */ 221 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 222 enum mos_regs reg, __u8 *data) 223 { 224 struct usb_device *usbdev = serial->dev; 225 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 226 __u8 request = (__u8)0x0d; 227 __u8 requesttype = (__u8)0xc0; 228 __u16 index = get_reg_index(reg); 229 __u16 value = get_reg_value(reg, serial_portnum); 230 u8 *buf; 231 int status; 232 233 buf = kmalloc(1, GFP_KERNEL); 234 if (!buf) 235 return -ENOMEM; 236 237 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 238 index, buf, 1, MOS_WDR_TIMEOUT); 239 if (status == 1) 240 *data = *buf; 241 else if (status < 0) 242 dev_err(&usbdev->dev, 243 "mos7720: usb_control_msg() failed: %d\n", status); 244 kfree(buf); 245 246 return status; 247 } 248 249 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 250 251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 252 enum mos7715_pp_modes mode) 253 { 254 mos_parport->shadowECR = mode; 255 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 256 mos_parport->shadowECR); 257 return 0; 258 } 259 260 static void destroy_mos_parport(struct kref *kref) 261 { 262 struct mos7715_parport *mos_parport = 263 container_of(kref, struct mos7715_parport, ref_count); 264 265 kfree(mos_parport); 266 } 267 268 static void destroy_urbtracker(struct kref *kref) 269 { 270 struct urbtracker *urbtrack = 271 container_of(kref, struct urbtracker, ref_count); 272 struct mos7715_parport *mos_parport = urbtrack->mos_parport; 273 274 usb_free_urb(urbtrack->urb); 275 kfree(urbtrack->setup); 276 kfree(urbtrack); 277 kref_put(&mos_parport->ref_count, destroy_mos_parport); 278 } 279 280 /* 281 * This runs as a tasklet when sending an urb in a non-blocking parallel 282 * port callback had to be deferred because the disconnect mutex could not be 283 * obtained at the time. 284 */ 285 static void send_deferred_urbs(unsigned long _mos_parport) 286 { 287 int ret_val; 288 unsigned long flags; 289 struct mos7715_parport *mos_parport = (void *)_mos_parport; 290 struct urbtracker *urbtrack, *tmp; 291 struct list_head *cursor, *next; 292 struct device *dev; 293 294 /* if release function ran, game over */ 295 if (unlikely(mos_parport->serial == NULL)) 296 return; 297 298 dev = &mos_parport->serial->dev->dev; 299 300 /* try again to get the mutex */ 301 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) { 302 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__); 303 tasklet_schedule(&mos_parport->urb_tasklet); 304 return; 305 } 306 307 /* if device disconnected, game over */ 308 if (unlikely(mos_parport->serial->disconnected)) { 309 mutex_unlock(&mos_parport->serial->disc_mutex); 310 return; 311 } 312 313 spin_lock_irqsave(&mos_parport->listlock, flags); 314 if (list_empty(&mos_parport->deferred_urbs)) { 315 spin_unlock_irqrestore(&mos_parport->listlock, flags); 316 mutex_unlock(&mos_parport->serial->disc_mutex); 317 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__); 318 return; 319 } 320 321 /* move contents of deferred_urbs list to active_urbs list and submit */ 322 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs) 323 list_move_tail(cursor, &mos_parport->active_urbs); 324 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs, 325 urblist_entry) { 326 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 327 dev_dbg(dev, "%s: urb submitted\n", __func__); 328 if (ret_val) { 329 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val); 330 list_del(&urbtrack->urblist_entry); 331 kref_put(&urbtrack->ref_count, destroy_urbtracker); 332 } 333 } 334 spin_unlock_irqrestore(&mos_parport->listlock, flags); 335 mutex_unlock(&mos_parport->serial->disc_mutex); 336 } 337 338 /* callback for parallel port control urbs submitted asynchronously */ 339 static void async_complete(struct urb *urb) 340 { 341 struct urbtracker *urbtrack = urb->context; 342 int status = urb->status; 343 344 if (unlikely(status)) 345 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); 346 347 /* remove the urbtracker from the active_urbs list */ 348 spin_lock(&urbtrack->mos_parport->listlock); 349 list_del(&urbtrack->urblist_entry); 350 spin_unlock(&urbtrack->mos_parport->listlock); 351 kref_put(&urbtrack->ref_count, destroy_urbtracker); 352 } 353 354 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 355 enum mos_regs reg, __u8 data) 356 { 357 struct urbtracker *urbtrack; 358 int ret_val; 359 unsigned long flags; 360 struct usb_serial *serial = mos_parport->serial; 361 struct usb_device *usbdev = serial->dev; 362 363 /* create and initialize the control urb and containing urbtracker */ 364 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC); 365 if (!urbtrack) 366 return -ENOMEM; 367 368 kref_get(&mos_parport->ref_count); 369 urbtrack->mos_parport = mos_parport; 370 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); 371 if (!urbtrack->urb) { 372 kfree(urbtrack); 373 return -ENOMEM; 374 } 375 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC); 376 if (!urbtrack->setup) { 377 usb_free_urb(urbtrack->urb); 378 kfree(urbtrack); 379 return -ENOMEM; 380 } 381 urbtrack->setup->bRequestType = (__u8)0x40; 382 urbtrack->setup->bRequest = (__u8)0x0e; 383 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy)); 384 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg)); 385 urbtrack->setup->wLength = 0; 386 usb_fill_control_urb(urbtrack->urb, usbdev, 387 usb_sndctrlpipe(usbdev, 0), 388 (unsigned char *)urbtrack->setup, 389 NULL, 0, async_complete, urbtrack); 390 kref_init(&urbtrack->ref_count); 391 INIT_LIST_HEAD(&urbtrack->urblist_entry); 392 393 /* 394 * get the disconnect mutex, or add tracker to the deferred_urbs list 395 * and schedule a tasklet to try again later 396 */ 397 if (!mutex_trylock(&serial->disc_mutex)) { 398 spin_lock_irqsave(&mos_parport->listlock, flags); 399 list_add_tail(&urbtrack->urblist_entry, 400 &mos_parport->deferred_urbs); 401 spin_unlock_irqrestore(&mos_parport->listlock, flags); 402 tasklet_schedule(&mos_parport->urb_tasklet); 403 dev_dbg(&usbdev->dev, "tasklet scheduled\n"); 404 return 0; 405 } 406 407 /* bail if device disconnected */ 408 if (serial->disconnected) { 409 kref_put(&urbtrack->ref_count, destroy_urbtracker); 410 mutex_unlock(&serial->disc_mutex); 411 return -ENODEV; 412 } 413 414 /* add the tracker to the active_urbs list and submit */ 415 spin_lock_irqsave(&mos_parport->listlock, flags); 416 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs); 417 spin_unlock_irqrestore(&mos_parport->listlock, flags); 418 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC); 419 mutex_unlock(&serial->disc_mutex); 420 if (ret_val) { 421 dev_err(&usbdev->dev, 422 "%s: submit_urb() failed: %d\n", __func__, ret_val); 423 spin_lock_irqsave(&mos_parport->listlock, flags); 424 list_del(&urbtrack->urblist_entry); 425 spin_unlock_irqrestore(&mos_parport->listlock, flags); 426 kref_put(&urbtrack->ref_count, destroy_urbtracker); 427 return ret_val; 428 } 429 return 0; 430 } 431 432 /* 433 * This is the the common top part of all parallel port callback operations that 434 * send synchronous messages to the device. This implements convoluted locking 435 * that avoids two scenarios: (1) a port operation is called after usbserial 436 * has called our release function, at which point struct mos7715_parport has 437 * been destroyed, and (2) the device has been disconnected, but usbserial has 438 * not called the release function yet because someone has a serial port open. 439 * The shared release_lock prevents the first, and the mutex and disconnected 440 * flag maintained by usbserial covers the second. We also use the msg_pending 441 * flag to ensure that all synchronous usb message calls have completed before 442 * our release function can return. 443 */ 444 static int parport_prologue(struct parport *pp) 445 { 446 struct mos7715_parport *mos_parport; 447 448 spin_lock(&release_lock); 449 mos_parport = pp->private_data; 450 if (unlikely(mos_parport == NULL)) { 451 /* release fn called, port struct destroyed */ 452 spin_unlock(&release_lock); 453 return -1; 454 } 455 mos_parport->msg_pending = true; /* synch usb call pending */ 456 reinit_completion(&mos_parport->syncmsg_compl); 457 spin_unlock(&release_lock); 458 459 mutex_lock(&mos_parport->serial->disc_mutex); 460 if (mos_parport->serial->disconnected) { 461 /* device disconnected */ 462 mutex_unlock(&mos_parport->serial->disc_mutex); 463 mos_parport->msg_pending = false; 464 complete(&mos_parport->syncmsg_compl); 465 return -1; 466 } 467 468 return 0; 469 } 470 471 /* 472 * This is the common bottom part of all parallel port functions that send 473 * synchronous messages to the device. 474 */ 475 static inline void parport_epilogue(struct parport *pp) 476 { 477 struct mos7715_parport *mos_parport = pp->private_data; 478 mutex_unlock(&mos_parport->serial->disc_mutex); 479 mos_parport->msg_pending = false; 480 complete(&mos_parport->syncmsg_compl); 481 } 482 483 static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 484 { 485 struct mos7715_parport *mos_parport = pp->private_data; 486 487 if (parport_prologue(pp) < 0) 488 return; 489 mos7715_change_mode(mos_parport, SPP); 490 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d); 491 parport_epilogue(pp); 492 } 493 494 static unsigned char parport_mos7715_read_data(struct parport *pp) 495 { 496 struct mos7715_parport *mos_parport = pp->private_data; 497 unsigned char d; 498 499 if (parport_prologue(pp) < 0) 500 return 0; 501 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d); 502 parport_epilogue(pp); 503 return d; 504 } 505 506 static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 507 { 508 struct mos7715_parport *mos_parport = pp->private_data; 509 __u8 data; 510 511 if (parport_prologue(pp) < 0) 512 return; 513 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 514 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data); 515 mos_parport->shadowDCR = data; 516 parport_epilogue(pp); 517 } 518 519 static unsigned char parport_mos7715_read_control(struct parport *pp) 520 { 521 struct mos7715_parport *mos_parport = pp->private_data; 522 __u8 dcr; 523 524 spin_lock(&release_lock); 525 mos_parport = pp->private_data; 526 if (unlikely(mos_parport == NULL)) { 527 spin_unlock(&release_lock); 528 return 0; 529 } 530 dcr = mos_parport->shadowDCR & 0x0f; 531 spin_unlock(&release_lock); 532 return dcr; 533 } 534 535 static unsigned char parport_mos7715_frob_control(struct parport *pp, 536 unsigned char mask, 537 unsigned char val) 538 { 539 struct mos7715_parport *mos_parport = pp->private_data; 540 __u8 dcr; 541 542 mask &= 0x0f; 543 val &= 0x0f; 544 if (parport_prologue(pp) < 0) 545 return 0; 546 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 547 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 548 mos_parport->shadowDCR); 549 dcr = mos_parport->shadowDCR & 0x0f; 550 parport_epilogue(pp); 551 return dcr; 552 } 553 554 static unsigned char parport_mos7715_read_status(struct parport *pp) 555 { 556 unsigned char status; 557 struct mos7715_parport *mos_parport = pp->private_data; 558 559 spin_lock(&release_lock); 560 mos_parport = pp->private_data; 561 if (unlikely(mos_parport == NULL)) { /* release called */ 562 spin_unlock(&release_lock); 563 return 0; 564 } 565 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 566 spin_unlock(&release_lock); 567 return status; 568 } 569 570 static void parport_mos7715_enable_irq(struct parport *pp) 571 { 572 } 573 574 static void parport_mos7715_disable_irq(struct parport *pp) 575 { 576 } 577 578 static void parport_mos7715_data_forward(struct parport *pp) 579 { 580 struct mos7715_parport *mos_parport = pp->private_data; 581 582 if (parport_prologue(pp) < 0) 583 return; 584 mos7715_change_mode(mos_parport, PS2); 585 mos_parport->shadowDCR &= ~0x20; 586 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 587 mos_parport->shadowDCR); 588 parport_epilogue(pp); 589 } 590 591 static void parport_mos7715_data_reverse(struct parport *pp) 592 { 593 struct mos7715_parport *mos_parport = pp->private_data; 594 595 if (parport_prologue(pp) < 0) 596 return; 597 mos7715_change_mode(mos_parport, PS2); 598 mos_parport->shadowDCR |= 0x20; 599 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 600 mos_parport->shadowDCR); 601 parport_epilogue(pp); 602 } 603 604 static void parport_mos7715_init_state(struct pardevice *dev, 605 struct parport_state *s) 606 { 607 s->u.pc.ctr = DCR_INIT_VAL; 608 s->u.pc.ecr = ECR_INIT_VAL; 609 } 610 611 /* N.B. Parport core code requires that this function not block */ 612 static void parport_mos7715_save_state(struct parport *pp, 613 struct parport_state *s) 614 { 615 struct mos7715_parport *mos_parport; 616 617 spin_lock(&release_lock); 618 mos_parport = pp->private_data; 619 if (unlikely(mos_parport == NULL)) { /* release called */ 620 spin_unlock(&release_lock); 621 return; 622 } 623 s->u.pc.ctr = mos_parport->shadowDCR; 624 s->u.pc.ecr = mos_parport->shadowECR; 625 spin_unlock(&release_lock); 626 } 627 628 /* N.B. Parport core code requires that this function not block */ 629 static void parport_mos7715_restore_state(struct parport *pp, 630 struct parport_state *s) 631 { 632 struct mos7715_parport *mos_parport; 633 634 spin_lock(&release_lock); 635 mos_parport = pp->private_data; 636 if (unlikely(mos_parport == NULL)) { /* release called */ 637 spin_unlock(&release_lock); 638 return; 639 } 640 write_parport_reg_nonblock(mos_parport, MOS7720_DCR, 641 mos_parport->shadowDCR); 642 write_parport_reg_nonblock(mos_parport, MOS7720_ECR, 643 mos_parport->shadowECR); 644 spin_unlock(&release_lock); 645 } 646 647 static size_t parport_mos7715_write_compat(struct parport *pp, 648 const void *buffer, 649 size_t len, int flags) 650 { 651 int retval; 652 struct mos7715_parport *mos_parport = pp->private_data; 653 int actual_len; 654 655 if (parport_prologue(pp) < 0) 656 return 0; 657 mos7715_change_mode(mos_parport, PPF); 658 retval = usb_bulk_msg(mos_parport->serial->dev, 659 usb_sndbulkpipe(mos_parport->serial->dev, 2), 660 (void *)buffer, len, &actual_len, 661 MOS_WDR_TIMEOUT); 662 parport_epilogue(pp); 663 if (retval) { 664 dev_err(&mos_parport->serial->dev->dev, 665 "mos7720: usb_bulk_msg() failed: %d\n", retval); 666 return 0; 667 } 668 return actual_len; 669 } 670 671 static struct parport_operations parport_mos7715_ops = { 672 .owner = THIS_MODULE, 673 .write_data = parport_mos7715_write_data, 674 .read_data = parport_mos7715_read_data, 675 676 .write_control = parport_mos7715_write_control, 677 .read_control = parport_mos7715_read_control, 678 .frob_control = parport_mos7715_frob_control, 679 680 .read_status = parport_mos7715_read_status, 681 682 .enable_irq = parport_mos7715_enable_irq, 683 .disable_irq = parport_mos7715_disable_irq, 684 685 .data_forward = parport_mos7715_data_forward, 686 .data_reverse = parport_mos7715_data_reverse, 687 688 .init_state = parport_mos7715_init_state, 689 .save_state = parport_mos7715_save_state, 690 .restore_state = parport_mos7715_restore_state, 691 692 .compat_write_data = parport_mos7715_write_compat, 693 694 .nibble_read_data = parport_ieee1284_read_nibble, 695 .byte_read_data = parport_ieee1284_read_byte, 696 }; 697 698 /* 699 * Allocate and initialize parallel port control struct, initialize 700 * the parallel port hardware device, and register with the parport subsystem. 701 */ 702 static int mos7715_parport_init(struct usb_serial *serial) 703 { 704 struct mos7715_parport *mos_parport; 705 706 /* allocate and initialize parallel port control struct */ 707 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 708 if (!mos_parport) 709 return -ENOMEM; 710 711 mos_parport->msg_pending = false; 712 kref_init(&mos_parport->ref_count); 713 spin_lock_init(&mos_parport->listlock); 714 INIT_LIST_HEAD(&mos_parport->active_urbs); 715 INIT_LIST_HEAD(&mos_parport->deferred_urbs); 716 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 717 mos_parport->serial = serial; 718 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs, 719 (unsigned long) mos_parport); 720 init_completion(&mos_parport->syncmsg_compl); 721 722 /* cycle parallel port reset bit */ 723 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80); 724 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00); 725 726 /* initialize device registers */ 727 mos_parport->shadowDCR = DCR_INIT_VAL; 728 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 729 mos_parport->shadowDCR); 730 mos_parport->shadowECR = ECR_INIT_VAL; 731 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 732 mos_parport->shadowECR); 733 734 /* register with parport core */ 735 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 736 PARPORT_DMA_NONE, 737 &parport_mos7715_ops); 738 if (mos_parport->pp == NULL) { 739 dev_err(&serial->interface->dev, 740 "Could not register parport\n"); 741 kref_put(&mos_parport->ref_count, destroy_mos_parport); 742 return -EIO; 743 } 744 mos_parport->pp->private_data = mos_parport; 745 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 746 mos_parport->pp->dev = &serial->interface->dev; 747 parport_announce_port(mos_parport->pp); 748 749 return 0; 750 } 751 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 752 753 /* 754 * mos7720_interrupt_callback 755 * this is the callback function for when we have received data on the 756 * interrupt endpoint. 757 */ 758 static void mos7720_interrupt_callback(struct urb *urb) 759 { 760 int result; 761 int length; 762 int status = urb->status; 763 struct device *dev = &urb->dev->dev; 764 __u8 *data; 765 __u8 sp1; 766 __u8 sp2; 767 768 switch (status) { 769 case 0: 770 /* success */ 771 break; 772 case -ECONNRESET: 773 case -ENOENT: 774 case -ESHUTDOWN: 775 /* this urb is terminated, clean up */ 776 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 777 return; 778 default: 779 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 780 goto exit; 781 } 782 783 length = urb->actual_length; 784 data = urb->transfer_buffer; 785 786 /* Moschip get 4 bytes 787 * Byte 1 IIR Port 1 (port.number is 0) 788 * Byte 2 IIR Port 2 (port.number is 1) 789 * Byte 3 -------------- 790 * Byte 4 FIFO status for both */ 791 792 /* the above description is inverted 793 * oneukum 2007-03-14 */ 794 795 if (unlikely(length != 4)) { 796 dev_dbg(dev, "Wrong data !!!\n"); 797 return; 798 } 799 800 sp1 = data[3]; 801 sp2 = data[2]; 802 803 if ((sp1 | sp2) & 0x01) { 804 /* No Interrupt Pending in both the ports */ 805 dev_dbg(dev, "No Interrupt !!!\n"); 806 } else { 807 switch (sp1 & 0x0f) { 808 case SERIAL_IIR_RLS: 809 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 810 break; 811 case SERIAL_IIR_CTI: 812 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 813 break; 814 case SERIAL_IIR_MS: 815 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 816 break; 817 } 818 819 switch (sp2 & 0x0f) { 820 case SERIAL_IIR_RLS: 821 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 822 break; 823 case SERIAL_IIR_CTI: 824 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 825 break; 826 case SERIAL_IIR_MS: 827 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 828 break; 829 } 830 } 831 832 exit: 833 result = usb_submit_urb(urb, GFP_ATOMIC); 834 if (result) 835 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 836 } 837 838 /* 839 * mos7715_interrupt_callback 840 * this is the 7715's callback function for when we have received data on 841 * the interrupt endpoint. 842 */ 843 static void mos7715_interrupt_callback(struct urb *urb) 844 { 845 int result; 846 int length; 847 int status = urb->status; 848 struct device *dev = &urb->dev->dev; 849 __u8 *data; 850 __u8 iir; 851 852 switch (status) { 853 case 0: 854 /* success */ 855 break; 856 case -ECONNRESET: 857 case -ENOENT: 858 case -ESHUTDOWN: 859 case -ENODEV: 860 /* this urb is terminated, clean up */ 861 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 862 return; 863 default: 864 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 865 goto exit; 866 } 867 868 length = urb->actual_length; 869 data = urb->transfer_buffer; 870 871 /* Structure of data from 7715 device: 872 * Byte 1: IIR serial Port 873 * Byte 2: unused 874 * Byte 2: DSR parallel port 875 * Byte 4: FIFO status for both */ 876 877 if (unlikely(length != 4)) { 878 dev_dbg(dev, "Wrong data !!!\n"); 879 return; 880 } 881 882 iir = data[0]; 883 if (!(iir & 0x01)) { /* serial port interrupt pending */ 884 switch (iir & 0x0f) { 885 case SERIAL_IIR_RLS: 886 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n"); 887 break; 888 case SERIAL_IIR_CTI: 889 dev_dbg(dev, "Serial Port: Receiver time out\n"); 890 break; 891 case SERIAL_IIR_MS: 892 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 893 break; 894 } 895 } 896 897 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 898 { /* update local copy of DSR reg */ 899 struct usb_serial_port *port = urb->context; 900 struct mos7715_parport *mos_parport = port->serial->private; 901 if (unlikely(mos_parport == NULL)) 902 return; 903 atomic_set(&mos_parport->shadowDSR, data[2]); 904 } 905 #endif 906 907 exit: 908 result = usb_submit_urb(urb, GFP_ATOMIC); 909 if (result) 910 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 911 } 912 913 /* 914 * mos7720_bulk_in_callback 915 * this is the callback function for when we have received data on the 916 * bulk in endpoint. 917 */ 918 static void mos7720_bulk_in_callback(struct urb *urb) 919 { 920 int retval; 921 unsigned char *data ; 922 struct usb_serial_port *port; 923 int status = urb->status; 924 925 if (status) { 926 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 927 return; 928 } 929 930 port = urb->context; 931 932 dev_dbg(&port->dev, "Entering...%s\n", __func__); 933 934 data = urb->transfer_buffer; 935 936 if (urb->actual_length) { 937 tty_insert_flip_string(&port->port, data, urb->actual_length); 938 tty_flip_buffer_push(&port->port); 939 } 940 941 if (port->read_urb->status != -EINPROGRESS) { 942 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 943 if (retval) 944 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 945 } 946 } 947 948 /* 949 * mos7720_bulk_out_data_callback 950 * this is the callback function for when we have finished sending serial 951 * data on the bulk out endpoint. 952 */ 953 static void mos7720_bulk_out_data_callback(struct urb *urb) 954 { 955 struct moschip_port *mos7720_port; 956 int status = urb->status; 957 958 if (status) { 959 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 960 return; 961 } 962 963 mos7720_port = urb->context; 964 if (!mos7720_port) { 965 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 966 return ; 967 } 968 969 if (mos7720_port->open) 970 tty_port_tty_wakeup(&mos7720_port->port->port); 971 } 972 973 /* 974 * mos77xx_probe 975 * this function installs the appropriate read interrupt endpoint callback 976 * depending on whether the device is a 7720 or 7715, thus avoiding costly 977 * run-time checks in the high-frequency callback routine itself. 978 */ 979 static int mos77xx_probe(struct usb_serial *serial, 980 const struct usb_device_id *id) 981 { 982 if (id->idProduct == MOSCHIP_DEVICE_ID_7715) 983 moschip7720_2port_driver.read_int_callback = 984 mos7715_interrupt_callback; 985 else 986 moschip7720_2port_driver.read_int_callback = 987 mos7720_interrupt_callback; 988 989 return 0; 990 } 991 992 static int mos77xx_calc_num_ports(struct usb_serial *serial) 993 { 994 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 995 if (product == MOSCHIP_DEVICE_ID_7715) 996 return 1; 997 998 return 2; 999 } 1000 1001 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 1002 { 1003 struct usb_serial *serial; 1004 struct urb *urb; 1005 struct moschip_port *mos7720_port; 1006 int response; 1007 int port_number; 1008 __u8 data; 1009 int allocated_urbs = 0; 1010 int j; 1011 1012 serial = port->serial; 1013 1014 mos7720_port = usb_get_serial_port_data(port); 1015 if (mos7720_port == NULL) 1016 return -ENODEV; 1017 1018 usb_clear_halt(serial->dev, port->write_urb->pipe); 1019 usb_clear_halt(serial->dev, port->read_urb->pipe); 1020 1021 /* Initialising the write urb pool */ 1022 for (j = 0; j < NUM_URBS; ++j) { 1023 urb = usb_alloc_urb(0, GFP_KERNEL); 1024 mos7720_port->write_urb_pool[j] = urb; 1025 if (!urb) 1026 continue; 1027 1028 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1029 GFP_KERNEL); 1030 if (!urb->transfer_buffer) { 1031 usb_free_urb(mos7720_port->write_urb_pool[j]); 1032 mos7720_port->write_urb_pool[j] = NULL; 1033 continue; 1034 } 1035 allocated_urbs++; 1036 } 1037 1038 if (!allocated_urbs) 1039 return -ENOMEM; 1040 1041 /* Initialize MCS7720 -- Write Init values to corresponding Registers 1042 * 1043 * Register Index 1044 * 0 : MOS7720_THR/MOS7720_RHR 1045 * 1 : MOS7720_IER 1046 * 2 : MOS7720_FCR 1047 * 3 : MOS7720_LCR 1048 * 4 : MOS7720_MCR 1049 * 5 : MOS7720_LSR 1050 * 6 : MOS7720_MSR 1051 * 7 : MOS7720_SPR 1052 * 1053 * 0x08 : SP1/2 Control Reg 1054 */ 1055 port_number = port->port_number; 1056 read_mos_reg(serial, port_number, MOS7720_LSR, &data); 1057 1058 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 1059 1060 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02); 1061 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02); 1062 1063 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1064 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1065 1066 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1067 mos7720_port->shadowLCR = 0x03; 1068 write_mos_reg(serial, port_number, MOS7720_LCR, 1069 mos7720_port->shadowLCR); 1070 mos7720_port->shadowMCR = 0x0b; 1071 write_mos_reg(serial, port_number, MOS7720_MCR, 1072 mos7720_port->shadowMCR); 1073 1074 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00); 1075 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data); 1076 data = data | (port->port_number + 1); 1077 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data); 1078 mos7720_port->shadowLCR = 0x83; 1079 write_mos_reg(serial, port_number, MOS7720_LCR, 1080 mos7720_port->shadowLCR); 1081 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c); 1082 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1083 mos7720_port->shadowLCR = 0x03; 1084 write_mos_reg(serial, port_number, MOS7720_LCR, 1085 mos7720_port->shadowLCR); 1086 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1087 1088 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 1089 if (response) 1090 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 1091 __func__, response); 1092 1093 /* initialize our port settings */ 1094 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 1095 1096 /* send a open port command */ 1097 mos7720_port->open = 1; 1098 1099 return 0; 1100 } 1101 1102 /* 1103 * mos7720_chars_in_buffer 1104 * this function is called by the tty driver when it wants to know how many 1105 * bytes of data we currently have outstanding in the port (data that has 1106 * been written, but hasn't made it out the port yet) 1107 * If successful, we return the number of bytes left to be written in the 1108 * system, 1109 * Otherwise we return a negative error number. 1110 */ 1111 static int mos7720_chars_in_buffer(struct tty_struct *tty) 1112 { 1113 struct usb_serial_port *port = tty->driver_data; 1114 int i; 1115 int chars = 0; 1116 struct moschip_port *mos7720_port; 1117 1118 mos7720_port = usb_get_serial_port_data(port); 1119 if (mos7720_port == NULL) 1120 return 0; 1121 1122 for (i = 0; i < NUM_URBS; ++i) { 1123 if (mos7720_port->write_urb_pool[i] && 1124 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 1125 chars += URB_TRANSFER_BUFFER_SIZE; 1126 } 1127 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1128 return chars; 1129 } 1130 1131 static void mos7720_close(struct usb_serial_port *port) 1132 { 1133 struct usb_serial *serial; 1134 struct moschip_port *mos7720_port; 1135 int j; 1136 1137 serial = port->serial; 1138 1139 mos7720_port = usb_get_serial_port_data(port); 1140 if (mos7720_port == NULL) 1141 return; 1142 1143 for (j = 0; j < NUM_URBS; ++j) 1144 usb_kill_urb(mos7720_port->write_urb_pool[j]); 1145 1146 /* Freeing Write URBs */ 1147 for (j = 0; j < NUM_URBS; ++j) { 1148 if (mos7720_port->write_urb_pool[j]) { 1149 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 1150 usb_free_urb(mos7720_port->write_urb_pool[j]); 1151 } 1152 } 1153 1154 /* While closing port, shutdown all bulk read, write * 1155 * and interrupt read if they exists, otherwise nop */ 1156 usb_kill_urb(port->write_urb); 1157 usb_kill_urb(port->read_urb); 1158 1159 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); 1160 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); 1161 1162 mos7720_port->open = 0; 1163 } 1164 1165 static void mos7720_break(struct tty_struct *tty, int break_state) 1166 { 1167 struct usb_serial_port *port = tty->driver_data; 1168 unsigned char data; 1169 struct usb_serial *serial; 1170 struct moschip_port *mos7720_port; 1171 1172 serial = port->serial; 1173 1174 mos7720_port = usb_get_serial_port_data(port); 1175 if (mos7720_port == NULL) 1176 return; 1177 1178 if (break_state == -1) 1179 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1180 else 1181 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1182 1183 mos7720_port->shadowLCR = data; 1184 write_mos_reg(serial, port->port_number, MOS7720_LCR, 1185 mos7720_port->shadowLCR); 1186 } 1187 1188 /* 1189 * mos7720_write_room 1190 * this function is called by the tty driver when it wants to know how many 1191 * bytes of data we can accept for a specific port. 1192 * If successful, we return the amount of room that we have for this port 1193 * Otherwise we return a negative error number. 1194 */ 1195 static int mos7720_write_room(struct tty_struct *tty) 1196 { 1197 struct usb_serial_port *port = tty->driver_data; 1198 struct moschip_port *mos7720_port; 1199 int room = 0; 1200 int i; 1201 1202 mos7720_port = usb_get_serial_port_data(port); 1203 if (mos7720_port == NULL) 1204 return -ENODEV; 1205 1206 /* FIXME: Locking */ 1207 for (i = 0; i < NUM_URBS; ++i) { 1208 if (mos7720_port->write_urb_pool[i] && 1209 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1210 room += URB_TRANSFER_BUFFER_SIZE; 1211 } 1212 1213 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1214 return room; 1215 } 1216 1217 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1218 const unsigned char *data, int count) 1219 { 1220 int status; 1221 int i; 1222 int bytes_sent = 0; 1223 int transfer_size; 1224 1225 struct moschip_port *mos7720_port; 1226 struct usb_serial *serial; 1227 struct urb *urb; 1228 const unsigned char *current_position = data; 1229 1230 serial = port->serial; 1231 1232 mos7720_port = usb_get_serial_port_data(port); 1233 if (mos7720_port == NULL) 1234 return -ENODEV; 1235 1236 /* try to find a free urb in the list */ 1237 urb = NULL; 1238 1239 for (i = 0; i < NUM_URBS; ++i) { 1240 if (mos7720_port->write_urb_pool[i] && 1241 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1242 urb = mos7720_port->write_urb_pool[i]; 1243 dev_dbg(&port->dev, "URB:%d\n", i); 1244 break; 1245 } 1246 } 1247 1248 if (urb == NULL) { 1249 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1250 goto exit; 1251 } 1252 1253 if (urb->transfer_buffer == NULL) { 1254 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1255 GFP_KERNEL); 1256 if (!urb->transfer_buffer) 1257 goto exit; 1258 } 1259 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1260 1261 memcpy(urb->transfer_buffer, current_position, transfer_size); 1262 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1263 urb->transfer_buffer); 1264 1265 /* fill urb with data and submit */ 1266 usb_fill_bulk_urb(urb, serial->dev, 1267 usb_sndbulkpipe(serial->dev, 1268 port->bulk_out_endpointAddress), 1269 urb->transfer_buffer, transfer_size, 1270 mos7720_bulk_out_data_callback, mos7720_port); 1271 1272 /* send it down the pipe */ 1273 status = usb_submit_urb(urb, GFP_ATOMIC); 1274 if (status) { 1275 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1276 "with status = %d\n", __func__, status); 1277 bytes_sent = status; 1278 goto exit; 1279 } 1280 bytes_sent = transfer_size; 1281 1282 exit: 1283 return bytes_sent; 1284 } 1285 1286 static void mos7720_throttle(struct tty_struct *tty) 1287 { 1288 struct usb_serial_port *port = tty->driver_data; 1289 struct moschip_port *mos7720_port; 1290 int status; 1291 1292 mos7720_port = usb_get_serial_port_data(port); 1293 1294 if (mos7720_port == NULL) 1295 return; 1296 1297 if (!mos7720_port->open) { 1298 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1299 return; 1300 } 1301 1302 /* if we are implementing XON/XOFF, send the stop character */ 1303 if (I_IXOFF(tty)) { 1304 unsigned char stop_char = STOP_CHAR(tty); 1305 status = mos7720_write(tty, port, &stop_char, 1); 1306 if (status <= 0) 1307 return; 1308 } 1309 1310 /* if we are implementing RTS/CTS, toggle that line */ 1311 if (tty->termios.c_cflag & CRTSCTS) { 1312 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1313 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1314 mos7720_port->shadowMCR); 1315 } 1316 } 1317 1318 static void mos7720_unthrottle(struct tty_struct *tty) 1319 { 1320 struct usb_serial_port *port = tty->driver_data; 1321 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1322 int status; 1323 1324 if (mos7720_port == NULL) 1325 return; 1326 1327 if (!mos7720_port->open) { 1328 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1329 return; 1330 } 1331 1332 /* if we are implementing XON/XOFF, send the start character */ 1333 if (I_IXOFF(tty)) { 1334 unsigned char start_char = START_CHAR(tty); 1335 status = mos7720_write(tty, port, &start_char, 1); 1336 if (status <= 0) 1337 return; 1338 } 1339 1340 /* if we are implementing RTS/CTS, toggle that line */ 1341 if (tty->termios.c_cflag & CRTSCTS) { 1342 mos7720_port->shadowMCR |= UART_MCR_RTS; 1343 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1344 mos7720_port->shadowMCR); 1345 } 1346 } 1347 1348 /* FIXME: this function does not work */ 1349 static int set_higher_rates(struct moschip_port *mos7720_port, 1350 unsigned int baud) 1351 { 1352 struct usb_serial_port *port; 1353 struct usb_serial *serial; 1354 int port_number; 1355 enum mos_regs sp_reg; 1356 if (mos7720_port == NULL) 1357 return -EINVAL; 1358 1359 port = mos7720_port->port; 1360 serial = port->serial; 1361 1362 /*********************************************** 1363 * Init Sequence for higher rates 1364 ***********************************************/ 1365 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1366 port_number = port->port_number; 1367 1368 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1369 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1370 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1371 mos7720_port->shadowMCR = 0x0b; 1372 write_mos_reg(serial, port_number, MOS7720_MCR, 1373 mos7720_port->shadowMCR); 1374 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1375 1376 /*********************************************** 1377 * Set for higher rates * 1378 ***********************************************/ 1379 /* writing baud rate verbatum into uart clock field clearly not right */ 1380 if (port_number == 0) 1381 sp_reg = MOS7720_SP1_REG; 1382 else 1383 sp_reg = MOS7720_SP2_REG; 1384 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1385 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1386 mos7720_port->shadowMCR = 0x2b; 1387 write_mos_reg(serial, port_number, MOS7720_MCR, 1388 mos7720_port->shadowMCR); 1389 1390 /*********************************************** 1391 * Set DLL/DLM 1392 ***********************************************/ 1393 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1394 write_mos_reg(serial, port_number, MOS7720_LCR, 1395 mos7720_port->shadowLCR); 1396 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1397 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1398 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1399 write_mos_reg(serial, port_number, MOS7720_LCR, 1400 mos7720_port->shadowLCR); 1401 1402 return 0; 1403 } 1404 1405 /* baud rate information */ 1406 struct divisor_table_entry { 1407 __u32 baudrate; 1408 __u16 divisor; 1409 }; 1410 1411 /* Define table of divisors for moschip 7720 hardware * 1412 * These assume a 3.6864MHz crystal, the standard /16, and * 1413 * MCR.7 = 0. */ 1414 static struct divisor_table_entry divisor_table[] = { 1415 { 50, 2304}, 1416 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1417 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1418 { 150, 768}, 1419 { 300, 384}, 1420 { 600, 192}, 1421 { 1200, 96}, 1422 { 1800, 64}, 1423 { 2400, 48}, 1424 { 4800, 24}, 1425 { 7200, 16}, 1426 { 9600, 12}, 1427 { 19200, 6}, 1428 { 38400, 3}, 1429 { 57600, 2}, 1430 { 115200, 1}, 1431 }; 1432 1433 /***************************************************************************** 1434 * calc_baud_rate_divisor 1435 * this function calculates the proper baud rate divisor for the specified 1436 * baud rate. 1437 *****************************************************************************/ 1438 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1439 { 1440 int i; 1441 __u16 custom; 1442 __u16 round1; 1443 __u16 round; 1444 1445 1446 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1447 1448 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1449 if (divisor_table[i].baudrate == baudrate) { 1450 *divisor = divisor_table[i].divisor; 1451 return 0; 1452 } 1453 } 1454 1455 /* After trying for all the standard baud rates * 1456 * Try calculating the divisor for this baud rate */ 1457 if (baudrate > 75 && baudrate < 230400) { 1458 /* get the divisor */ 1459 custom = (__u16)(230400L / baudrate); 1460 1461 /* Check for round off */ 1462 round1 = (__u16)(2304000L / baudrate); 1463 round = (__u16)(round1 - (custom * 10)); 1464 if (round > 4) 1465 custom++; 1466 *divisor = custom; 1467 1468 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1469 return 0; 1470 } 1471 1472 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1473 return -EINVAL; 1474 } 1475 1476 /* 1477 * send_cmd_write_baud_rate 1478 * this function sends the proper command to change the baud rate of the 1479 * specified port. 1480 */ 1481 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1482 int baudrate) 1483 { 1484 struct usb_serial_port *port; 1485 struct usb_serial *serial; 1486 int divisor; 1487 int status; 1488 unsigned char number; 1489 1490 if (mos7720_port == NULL) 1491 return -1; 1492 1493 port = mos7720_port->port; 1494 serial = port->serial; 1495 1496 number = port->port_number; 1497 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1498 1499 /* Calculate the Divisor */ 1500 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1501 if (status) { 1502 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1503 return status; 1504 } 1505 1506 /* Enable access to divisor latch */ 1507 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1508 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1509 1510 /* Write the divisor */ 1511 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1512 write_mos_reg(serial, number, MOS7720_DLM, 1513 (__u8)((divisor & 0xff00) >> 8)); 1514 1515 /* Disable access to divisor latch */ 1516 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1517 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1518 1519 return status; 1520 } 1521 1522 /* 1523 * change_port_settings 1524 * This routine is called to set the UART on the device to match 1525 * the specified new settings. 1526 */ 1527 static void change_port_settings(struct tty_struct *tty, 1528 struct moschip_port *mos7720_port, 1529 struct ktermios *old_termios) 1530 { 1531 struct usb_serial_port *port; 1532 struct usb_serial *serial; 1533 int baud; 1534 unsigned cflag; 1535 unsigned iflag; 1536 __u8 mask = 0xff; 1537 __u8 lData; 1538 __u8 lParity; 1539 __u8 lStop; 1540 int status; 1541 int port_number; 1542 1543 if (mos7720_port == NULL) 1544 return ; 1545 1546 port = mos7720_port->port; 1547 serial = port->serial; 1548 port_number = port->port_number; 1549 1550 if (!mos7720_port->open) { 1551 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1552 return; 1553 } 1554 1555 lData = UART_LCR_WLEN8; 1556 lStop = 0x00; /* 1 stop bit */ 1557 lParity = 0x00; /* No parity */ 1558 1559 cflag = tty->termios.c_cflag; 1560 iflag = tty->termios.c_iflag; 1561 1562 /* Change the number of bits */ 1563 switch (cflag & CSIZE) { 1564 case CS5: 1565 lData = UART_LCR_WLEN5; 1566 mask = 0x1f; 1567 break; 1568 1569 case CS6: 1570 lData = UART_LCR_WLEN6; 1571 mask = 0x3f; 1572 break; 1573 1574 case CS7: 1575 lData = UART_LCR_WLEN7; 1576 mask = 0x7f; 1577 break; 1578 default: 1579 case CS8: 1580 lData = UART_LCR_WLEN8; 1581 break; 1582 } 1583 1584 /* Change the Parity bit */ 1585 if (cflag & PARENB) { 1586 if (cflag & PARODD) { 1587 lParity = UART_LCR_PARITY; 1588 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1589 } else { 1590 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1591 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1592 } 1593 1594 } else { 1595 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1596 } 1597 1598 if (cflag & CMSPAR) 1599 lParity = lParity | 0x20; 1600 1601 /* Change the Stop bit */ 1602 if (cflag & CSTOPB) { 1603 lStop = UART_LCR_STOP; 1604 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1605 } else { 1606 lStop = 0x00; 1607 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1608 } 1609 1610 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1611 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1612 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1613 1614 /* Update the LCR with the correct value */ 1615 mos7720_port->shadowLCR &= 1616 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1617 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1618 1619 1620 /* Disable Interrupts */ 1621 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1622 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1623 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1624 1625 /* Send the updated LCR value to the mos7720 */ 1626 write_mos_reg(serial, port_number, MOS7720_LCR, 1627 mos7720_port->shadowLCR); 1628 mos7720_port->shadowMCR = 0x0b; 1629 write_mos_reg(serial, port_number, MOS7720_MCR, 1630 mos7720_port->shadowMCR); 1631 1632 /* set up the MCR register and send it to the mos7720 */ 1633 mos7720_port->shadowMCR = UART_MCR_OUT2; 1634 if (cflag & CBAUD) 1635 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1636 1637 if (cflag & CRTSCTS) { 1638 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1639 /* To set hardware flow control to the specified * 1640 * serial port, in SP1/2_CONTROL_REG */ 1641 if (port_number) 1642 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1643 0x01); 1644 else 1645 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1646 0x02); 1647 1648 } else 1649 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1650 1651 write_mos_reg(serial, port_number, MOS7720_MCR, 1652 mos7720_port->shadowMCR); 1653 1654 /* Determine divisor based on baud rate */ 1655 baud = tty_get_baud_rate(tty); 1656 if (!baud) { 1657 /* pick a default, any default... */ 1658 dev_dbg(&port->dev, "Picked default baud...\n"); 1659 baud = 9600; 1660 } 1661 1662 if (baud >= 230400) { 1663 set_higher_rates(mos7720_port, baud); 1664 /* Enable Interrupts */ 1665 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1666 return; 1667 } 1668 1669 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1670 status = send_cmd_write_baud_rate(mos7720_port, baud); 1671 /* FIXME: needs to write actual resulting baud back not just 1672 blindly do so */ 1673 if (cflag & CBAUD) 1674 tty_encode_baud_rate(tty, baud, baud); 1675 /* Enable Interrupts */ 1676 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1677 1678 if (port->read_urb->status != -EINPROGRESS) { 1679 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1680 if (status) 1681 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1682 } 1683 } 1684 1685 /* 1686 * mos7720_set_termios 1687 * this function is called by the tty driver when it wants to change the 1688 * termios structure. 1689 */ 1690 static void mos7720_set_termios(struct tty_struct *tty, 1691 struct usb_serial_port *port, struct ktermios *old_termios) 1692 { 1693 int status; 1694 unsigned int cflag; 1695 struct usb_serial *serial; 1696 struct moschip_port *mos7720_port; 1697 1698 serial = port->serial; 1699 1700 mos7720_port = usb_get_serial_port_data(port); 1701 1702 if (mos7720_port == NULL) 1703 return; 1704 1705 if (!mos7720_port->open) { 1706 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1707 return; 1708 } 1709 1710 dev_dbg(&port->dev, "setting termios - ASPIRE\n"); 1711 1712 cflag = tty->termios.c_cflag; 1713 1714 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__, 1715 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag)); 1716 1717 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__, 1718 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 1719 1720 /* change the port settings to the new ones specified */ 1721 change_port_settings(tty, mos7720_port, old_termios); 1722 1723 if (port->read_urb->status != -EINPROGRESS) { 1724 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1725 if (status) 1726 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1727 } 1728 } 1729 1730 /* 1731 * get_lsr_info - get line status register info 1732 * 1733 * Purpose: Let user call ioctl() to get info when the UART physically 1734 * is emptied. On bus types like RS485, the transmitter must 1735 * release the bus after transmitting. This must be done when 1736 * the transmit shift register is empty, not be done when the 1737 * transmit holding register is empty. This functionality 1738 * allows an RS485 driver to be written in user space. 1739 */ 1740 static int get_lsr_info(struct tty_struct *tty, 1741 struct moschip_port *mos7720_port, unsigned int __user *value) 1742 { 1743 struct usb_serial_port *port = tty->driver_data; 1744 unsigned int result = 0; 1745 unsigned char data = 0; 1746 int port_number = port->port_number; 1747 int count; 1748 1749 count = mos7720_chars_in_buffer(tty); 1750 if (count == 0) { 1751 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1752 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1753 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1754 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1755 result = TIOCSER_TEMT; 1756 } 1757 } 1758 if (copy_to_user(value, &result, sizeof(int))) 1759 return -EFAULT; 1760 return 0; 1761 } 1762 1763 static int mos7720_tiocmget(struct tty_struct *tty) 1764 { 1765 struct usb_serial_port *port = tty->driver_data; 1766 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1767 unsigned int result = 0; 1768 unsigned int mcr ; 1769 unsigned int msr ; 1770 1771 mcr = mos7720_port->shadowMCR; 1772 msr = mos7720_port->shadowMSR; 1773 1774 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1775 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1776 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1777 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1778 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1779 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1780 1781 return result; 1782 } 1783 1784 static int mos7720_tiocmset(struct tty_struct *tty, 1785 unsigned int set, unsigned int clear) 1786 { 1787 struct usb_serial_port *port = tty->driver_data; 1788 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1789 unsigned int mcr ; 1790 1791 mcr = mos7720_port->shadowMCR; 1792 1793 if (set & TIOCM_RTS) 1794 mcr |= UART_MCR_RTS; 1795 if (set & TIOCM_DTR) 1796 mcr |= UART_MCR_DTR; 1797 if (set & TIOCM_LOOP) 1798 mcr |= UART_MCR_LOOP; 1799 1800 if (clear & TIOCM_RTS) 1801 mcr &= ~UART_MCR_RTS; 1802 if (clear & TIOCM_DTR) 1803 mcr &= ~UART_MCR_DTR; 1804 if (clear & TIOCM_LOOP) 1805 mcr &= ~UART_MCR_LOOP; 1806 1807 mos7720_port->shadowMCR = mcr; 1808 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1809 mos7720_port->shadowMCR); 1810 1811 return 0; 1812 } 1813 1814 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 1815 unsigned int __user *value) 1816 { 1817 unsigned int mcr; 1818 unsigned int arg; 1819 1820 struct usb_serial_port *port; 1821 1822 if (mos7720_port == NULL) 1823 return -1; 1824 1825 port = (struct usb_serial_port *)mos7720_port->port; 1826 mcr = mos7720_port->shadowMCR; 1827 1828 if (copy_from_user(&arg, value, sizeof(int))) 1829 return -EFAULT; 1830 1831 switch (cmd) { 1832 case TIOCMBIS: 1833 if (arg & TIOCM_RTS) 1834 mcr |= UART_MCR_RTS; 1835 if (arg & TIOCM_DTR) 1836 mcr |= UART_MCR_RTS; 1837 if (arg & TIOCM_LOOP) 1838 mcr |= UART_MCR_LOOP; 1839 break; 1840 1841 case TIOCMBIC: 1842 if (arg & TIOCM_RTS) 1843 mcr &= ~UART_MCR_RTS; 1844 if (arg & TIOCM_DTR) 1845 mcr &= ~UART_MCR_RTS; 1846 if (arg & TIOCM_LOOP) 1847 mcr &= ~UART_MCR_LOOP; 1848 break; 1849 1850 } 1851 1852 mos7720_port->shadowMCR = mcr; 1853 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1854 mos7720_port->shadowMCR); 1855 1856 return 0; 1857 } 1858 1859 static int get_serial_info(struct moschip_port *mos7720_port, 1860 struct serial_struct __user *retinfo) 1861 { 1862 struct serial_struct tmp; 1863 1864 if (!retinfo) 1865 return -EFAULT; 1866 1867 memset(&tmp, 0, sizeof(tmp)); 1868 1869 tmp.type = PORT_16550A; 1870 tmp.line = mos7720_port->port->minor; 1871 tmp.port = mos7720_port->port->port_number; 1872 tmp.irq = 0; 1873 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 1874 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1875 tmp.baud_base = 9600; 1876 tmp.close_delay = 5*HZ; 1877 tmp.closing_wait = 30*HZ; 1878 1879 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 1880 return -EFAULT; 1881 return 0; 1882 } 1883 1884 static int mos7720_ioctl(struct tty_struct *tty, 1885 unsigned int cmd, unsigned long arg) 1886 { 1887 struct usb_serial_port *port = tty->driver_data; 1888 struct moschip_port *mos7720_port; 1889 1890 mos7720_port = usb_get_serial_port_data(port); 1891 if (mos7720_port == NULL) 1892 return -ENODEV; 1893 1894 switch (cmd) { 1895 case TIOCSERGETLSR: 1896 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1897 return get_lsr_info(tty, mos7720_port, 1898 (unsigned int __user *)arg); 1899 1900 /* FIXME: These should be using the mode methods */ 1901 case TIOCMBIS: 1902 case TIOCMBIC: 1903 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__); 1904 return set_modem_info(mos7720_port, cmd, 1905 (unsigned int __user *)arg); 1906 1907 case TIOCGSERIAL: 1908 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__); 1909 return get_serial_info(mos7720_port, 1910 (struct serial_struct __user *)arg); 1911 } 1912 1913 return -ENOIOCTLCMD; 1914 } 1915 1916 static int mos7720_startup(struct usb_serial *serial) 1917 { 1918 struct usb_device *dev; 1919 char data; 1920 u16 product; 1921 int ret_val; 1922 1923 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1924 dev = serial->dev; 1925 1926 /* 1927 * The 7715 uses the first bulk in/out endpoint pair for the parallel 1928 * port, and the second for the serial port. Because the usbserial core 1929 * assumes both pairs are serial ports, we must engage in a bit of 1930 * subterfuge and swap the pointers for ports 0 and 1 in order to make 1931 * port 0 point to the serial port. However, both moschip devices use a 1932 * single interrupt-in endpoint for both ports (as mentioned a little 1933 * further down), and this endpoint was assigned to port 0. So after 1934 * the swap, we must copy the interrupt endpoint elements from port 1 1935 * (as newly assigned) to port 0, and null out port 1 pointers. 1936 */ 1937 if (product == MOSCHIP_DEVICE_ID_7715) { 1938 struct usb_serial_port *tmp = serial->port[0]; 1939 serial->port[0] = serial->port[1]; 1940 serial->port[1] = tmp; 1941 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb; 1942 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer; 1943 serial->port[0]->interrupt_in_endpointAddress = 1944 tmp->interrupt_in_endpointAddress; 1945 serial->port[1]->interrupt_in_urb = NULL; 1946 serial->port[1]->interrupt_in_buffer = NULL; 1947 } 1948 1949 /* setting configuration feature to one */ 1950 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1951 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); 1952 1953 /* start the interrupt urb */ 1954 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1955 if (ret_val) 1956 dev_err(&dev->dev, 1957 "%s - Error %d submitting control urb\n", 1958 __func__, ret_val); 1959 1960 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1961 if (product == MOSCHIP_DEVICE_ID_7715) { 1962 ret_val = mos7715_parport_init(serial); 1963 if (ret_val < 0) 1964 return ret_val; 1965 } 1966 #endif 1967 /* LSR For Port 1 */ 1968 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1969 dev_dbg(&dev->dev, "LSR:%x\n", data); 1970 1971 return 0; 1972 } 1973 1974 static void mos7720_release(struct usb_serial *serial) 1975 { 1976 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1977 /* close the parallel port */ 1978 1979 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1980 == MOSCHIP_DEVICE_ID_7715) { 1981 struct urbtracker *urbtrack; 1982 unsigned long flags; 1983 struct mos7715_parport *mos_parport = 1984 usb_get_serial_data(serial); 1985 1986 /* prevent NULL ptr dereference in port callbacks */ 1987 spin_lock(&release_lock); 1988 mos_parport->pp->private_data = NULL; 1989 spin_unlock(&release_lock); 1990 1991 /* wait for synchronous usb calls to return */ 1992 if (mos_parport->msg_pending) 1993 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1994 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1995 1996 parport_remove_port(mos_parport->pp); 1997 usb_set_serial_data(serial, NULL); 1998 mos_parport->serial = NULL; 1999 2000 /* if tasklet currently scheduled, wait for it to complete */ 2001 tasklet_kill(&mos_parport->urb_tasklet); 2002 2003 /* unlink any urbs sent by the tasklet */ 2004 spin_lock_irqsave(&mos_parport->listlock, flags); 2005 list_for_each_entry(urbtrack, 2006 &mos_parport->active_urbs, 2007 urblist_entry) 2008 usb_unlink_urb(urbtrack->urb); 2009 spin_unlock_irqrestore(&mos_parport->listlock, flags); 2010 2011 kref_put(&mos_parport->ref_count, destroy_mos_parport); 2012 } 2013 #endif 2014 } 2015 2016 static int mos7720_port_probe(struct usb_serial_port *port) 2017 { 2018 struct moschip_port *mos7720_port; 2019 2020 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 2021 if (!mos7720_port) 2022 return -ENOMEM; 2023 2024 /* Initialize all port interrupt end point to port 0 int endpoint. 2025 * Our device has only one interrupt endpoint common to all ports. 2026 */ 2027 port->interrupt_in_endpointAddress = 2028 port->serial->port[0]->interrupt_in_endpointAddress; 2029 mos7720_port->port = port; 2030 2031 usb_set_serial_port_data(port, mos7720_port); 2032 2033 return 0; 2034 } 2035 2036 static int mos7720_port_remove(struct usb_serial_port *port) 2037 { 2038 struct moschip_port *mos7720_port; 2039 2040 mos7720_port = usb_get_serial_port_data(port); 2041 kfree(mos7720_port); 2042 2043 return 0; 2044 } 2045 2046 static struct usb_serial_driver moschip7720_2port_driver = { 2047 .driver = { 2048 .owner = THIS_MODULE, 2049 .name = "moschip7720", 2050 }, 2051 .description = "Moschip 2 port adapter", 2052 .id_table = id_table, 2053 .calc_num_ports = mos77xx_calc_num_ports, 2054 .open = mos7720_open, 2055 .close = mos7720_close, 2056 .throttle = mos7720_throttle, 2057 .unthrottle = mos7720_unthrottle, 2058 .probe = mos77xx_probe, 2059 .attach = mos7720_startup, 2060 .release = mos7720_release, 2061 .port_probe = mos7720_port_probe, 2062 .port_remove = mos7720_port_remove, 2063 .ioctl = mos7720_ioctl, 2064 .tiocmget = mos7720_tiocmget, 2065 .tiocmset = mos7720_tiocmset, 2066 .set_termios = mos7720_set_termios, 2067 .write = mos7720_write, 2068 .write_room = mos7720_write_room, 2069 .chars_in_buffer = mos7720_chars_in_buffer, 2070 .break_ctl = mos7720_break, 2071 .read_bulk_callback = mos7720_bulk_in_callback, 2072 .read_int_callback = NULL /* dynamically assigned in probe() */ 2073 }; 2074 2075 static struct usb_serial_driver * const serial_drivers[] = { 2076 &moschip7720_2port_driver, NULL 2077 }; 2078 2079 module_usb_serial_driver(serial_drivers, id_table); 2080 2081 MODULE_AUTHOR(DRIVER_AUTHOR); 2082 MODULE_DESCRIPTION(DRIVER_DESC); 2083 MODULE_LICENSE("GPL"); 2084