1// SPDX-License-Identifier: GPL-2.0 2/* 3 * mos7720.c 4 * Controls the Moschip 7720 usb to dual port serial converter 5 * 6 * Copyright 2006 Moschip Semiconductor Tech. Ltd. 7 * 8 * Developed by: 9 * Vijaya Kumar <vijaykumar.gn@gmail.com> 10 * Ajay Kumar <naanuajay@yahoo.com> 11 * Gurudeva <ngurudeva@yahoo.com> 12 * 13 * Cleaned up from the original by: 14 * Greg Kroah-Hartman <gregkh@suse.de> 15 * 16 * Originally based on drivers/usb/serial/io_edgeport.c which is: 17 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 18 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 19 */ 20#include <linux/kernel.h> 21#include <linux/errno.h> 22#include <linux/slab.h> 23#include <linux/tty.h> 24#include <linux/tty_driver.h> 25#include <linux/tty_flip.h> 26#include <linux/module.h> 27#include <linux/spinlock.h> 28#include <linux/serial.h> 29#include <linux/serial_reg.h> 30#include <linux/usb.h> 31#include <linux/usb/serial.h> 32#include <linux/uaccess.h> 33#include <linux/parport.h> 34 35#define DRIVER_AUTHOR "Aspire Communications pvt Ltd." 36#define DRIVER_DESC "Moschip USB Serial Driver" 37 38/* default urb timeout */ 39#define MOS_WDR_TIMEOUT 5000 40 41#define MOS_MAX_PORT 0x02 42#define MOS_WRITE 0x0E 43#define MOS_READ 0x0D 44 45/* Interrupt Routines Defines */ 46#define SERIAL_IIR_RLS 0x06 47#define SERIAL_IIR_RDA 0x04 48#define SERIAL_IIR_CTI 0x0c 49#define SERIAL_IIR_THR 0x02 50#define SERIAL_IIR_MS 0x00 51 52#define NUM_URBS 16 /* URB Count */ 53#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 54 55/* This structure holds all of the local serial port information */ 56struct moschip_port { 57 __u8 shadowLCR; /* last LCR value received */ 58 __u8 shadowMCR; /* last MCR value received */ 59 __u8 shadowMSR; /* last MSR value received */ 60 char open; 61 struct usb_serial_port *port; /* loop back to the owner */ 62 struct urb *write_urb_pool[NUM_URBS]; 63}; 64 65#define USB_VENDOR_ID_MOSCHIP 0x9710 66#define MOSCHIP_DEVICE_ID_7720 0x7720 67#define MOSCHIP_DEVICE_ID_7715 0x7715 68 69static const struct usb_device_id id_table[] = { 70 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, 71 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, 72 { } /* terminating entry */ 73}; 74MODULE_DEVICE_TABLE(usb, id_table); 75 76#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 77 78/* initial values for parport regs */ 79#define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ 80#define ECR_INIT_VAL 0x00 /* SPP mode */ 81 82enum mos7715_pp_modes { 83 SPP = 0<<5, 84 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ 85 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ 86}; 87 88struct mos7715_parport { 89 struct parport *pp; /* back to containing struct */ 90 struct kref ref_count; /* to instance of this struct */ 91 bool msg_pending; /* usb sync call pending */ 92 struct completion syncmsg_compl; /* usb sync call completed */ 93 struct work_struct work; /* restore deferred writes */ 94 struct usb_serial *serial; /* back to containing struct */ 95 __u8 shadowECR; /* parallel port regs... */ 96 __u8 shadowDCR; 97 atomic_t shadowDSR; /* updated in int-in callback */ 98}; 99 100/* lock guards against dereferencing NULL ptr in parport ops callbacks */ 101static DEFINE_SPINLOCK(release_lock); 102 103#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 104 105static const unsigned int dummy; /* for clarity in register access fns */ 106 107enum mos_regs { 108 MOS7720_THR, /* serial port regs */ 109 MOS7720_RHR, 110 MOS7720_IER, 111 MOS7720_FCR, 112 MOS7720_ISR, 113 MOS7720_LCR, 114 MOS7720_MCR, 115 MOS7720_LSR, 116 MOS7720_MSR, 117 MOS7720_SPR, 118 MOS7720_DLL, 119 MOS7720_DLM, 120 MOS7720_DPR, /* parallel port regs */ 121 MOS7720_DSR, 122 MOS7720_DCR, 123 MOS7720_ECR, 124 MOS7720_SP1_REG, /* device control regs */ 125 MOS7720_SP2_REG, /* serial port 2 (7720 only) */ 126 MOS7720_PP_REG, 127 MOS7720_SP_CONTROL_REG, 128}; 129 130/* 131 * Return the correct value for the Windex field of the setup packet 132 * for a control endpoint message. See the 7715 datasheet. 133 */ 134static inline __u16 get_reg_index(enum mos_regs reg) 135{ 136 static const __u16 mos7715_index_lookup_table[] = { 137 0x00, /* MOS7720_THR */ 138 0x00, /* MOS7720_RHR */ 139 0x01, /* MOS7720_IER */ 140 0x02, /* MOS7720_FCR */ 141 0x02, /* MOS7720_ISR */ 142 0x03, /* MOS7720_LCR */ 143 0x04, /* MOS7720_MCR */ 144 0x05, /* MOS7720_LSR */ 145 0x06, /* MOS7720_MSR */ 146 0x07, /* MOS7720_SPR */ 147 0x00, /* MOS7720_DLL */ 148 0x01, /* MOS7720_DLM */ 149 0x00, /* MOS7720_DPR */ 150 0x01, /* MOS7720_DSR */ 151 0x02, /* MOS7720_DCR */ 152 0x0a, /* MOS7720_ECR */ 153 0x01, /* MOS7720_SP1_REG */ 154 0x02, /* MOS7720_SP2_REG (7720 only) */ 155 0x04, /* MOS7720_PP_REG (7715 only) */ 156 0x08, /* MOS7720_SP_CONTROL_REG */ 157 }; 158 return mos7715_index_lookup_table[reg]; 159} 160 161/* 162 * Return the correct value for the upper byte of the Wvalue field of 163 * the setup packet for a control endpoint message. 164 */ 165static inline __u16 get_reg_value(enum mos_regs reg, 166 unsigned int serial_portnum) 167{ 168 if (reg >= MOS7720_SP1_REG) /* control reg */ 169 return 0x0000; 170 171 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */ 172 return 0x0100; 173 174 else /* serial port reg */ 175 return (serial_portnum + 2) << 8; 176} 177 178/* 179 * Write data byte to the specified device register. The data is embedded in 180 * the value field of the setup packet. serial_portnum is ignored for registers 181 * not specific to a particular serial port. 182 */ 183static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 184 enum mos_regs reg, __u8 data) 185{ 186 struct usb_device *usbdev = serial->dev; 187 unsigned int pipe = usb_sndctrlpipe(usbdev, 0); 188 __u8 request = (__u8)0x0e; 189 __u8 requesttype = (__u8)0x40; 190 __u16 index = get_reg_index(reg); 191 __u16 value = get_reg_value(reg, serial_portnum) + data; 192 int status = usb_control_msg(usbdev, pipe, request, requesttype, value, 193 index, NULL, 0, MOS_WDR_TIMEOUT); 194 if (status < 0) 195 dev_err(&usbdev->dev, 196 "mos7720: usb_control_msg() failed: %d\n", status); 197 return status; 198} 199 200/* 201 * Read data byte from the specified device register. The data returned by the 202 * device is embedded in the value field of the setup packet. serial_portnum is 203 * ignored for registers that are not specific to a particular serial port. 204 */ 205static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, 206 enum mos_regs reg, __u8 *data) 207{ 208 struct usb_device *usbdev = serial->dev; 209 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); 210 __u8 request = (__u8)0x0d; 211 __u8 requesttype = (__u8)0xc0; 212 __u16 index = get_reg_index(reg); 213 __u16 value = get_reg_value(reg, serial_portnum); 214 u8 *buf; 215 int status; 216 217 buf = kmalloc(1, GFP_KERNEL); 218 if (!buf) { 219 *data = 0; 220 return -ENOMEM; 221 } 222 223 status = usb_control_msg(usbdev, pipe, request, requesttype, value, 224 index, buf, 1, MOS_WDR_TIMEOUT); 225 if (status == 1) { 226 *data = *buf; 227 } else { 228 dev_err(&usbdev->dev, 229 "mos7720: usb_control_msg() failed: %d\n", status); 230 if (status >= 0) 231 status = -EIO; 232 *data = 0; 233 } 234 235 kfree(buf); 236 237 return status; 238} 239 240#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 241 242static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, 243 enum mos7715_pp_modes mode) 244{ 245 mos_parport->shadowECR = mode; 246 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 247 mos_parport->shadowECR); 248 return 0; 249} 250 251static void destroy_mos_parport(struct kref *kref) 252{ 253 struct mos7715_parport *mos_parport = 254 container_of(kref, struct mos7715_parport, ref_count); 255 256 kfree(mos_parport); 257} 258 259/* 260 * This is the common top part of all parallel port callback operations that 261 * send synchronous messages to the device. This implements convoluted locking 262 * that avoids two scenarios: (1) a port operation is called after usbserial 263 * has called our release function, at which point struct mos7715_parport has 264 * been destroyed, and (2) the device has been disconnected, but usbserial has 265 * not called the release function yet because someone has a serial port open. 266 * The shared release_lock prevents the first, and the mutex and disconnected 267 * flag maintained by usbserial covers the second. We also use the msg_pending 268 * flag to ensure that all synchronous usb message calls have completed before 269 * our release function can return. 270 */ 271static int parport_prologue(struct parport *pp) 272{ 273 struct mos7715_parport *mos_parport; 274 275 spin_lock(&release_lock); 276 mos_parport = pp->private_data; 277 if (unlikely(mos_parport == NULL)) { 278 /* release fn called, port struct destroyed */ 279 spin_unlock(&release_lock); 280 return -1; 281 } 282 mos_parport->msg_pending = true; /* synch usb call pending */ 283 reinit_completion(&mos_parport->syncmsg_compl); 284 spin_unlock(&release_lock); 285 286 /* ensure writes from restore are submitted before new requests */ 287 if (work_pending(&mos_parport->work)) 288 flush_work(&mos_parport->work); 289 290 mutex_lock(&mos_parport->serial->disc_mutex); 291 if (mos_parport->serial->disconnected) { 292 /* device disconnected */ 293 mutex_unlock(&mos_parport->serial->disc_mutex); 294 mos_parport->msg_pending = false; 295 complete(&mos_parport->syncmsg_compl); 296 return -1; 297 } 298 299 return 0; 300} 301 302/* 303 * This is the common bottom part of all parallel port functions that send 304 * synchronous messages to the device. 305 */ 306static inline void parport_epilogue(struct parport *pp) 307{ 308 struct mos7715_parport *mos_parport = pp->private_data; 309 mutex_unlock(&mos_parport->serial->disc_mutex); 310 mos_parport->msg_pending = false; 311 complete(&mos_parport->syncmsg_compl); 312} 313 314static void deferred_restore_writes(struct work_struct *work) 315{ 316 struct mos7715_parport *mos_parport; 317 318 mos_parport = container_of(work, struct mos7715_parport, work); 319 320 mutex_lock(&mos_parport->serial->disc_mutex); 321 322 /* if device disconnected, game over */ 323 if (mos_parport->serial->disconnected) 324 goto done; 325 326 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 327 mos_parport->shadowDCR); 328 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 329 mos_parport->shadowECR); 330done: 331 mutex_unlock(&mos_parport->serial->disc_mutex); 332} 333 334static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 335{ 336 struct mos7715_parport *mos_parport = pp->private_data; 337 338 if (parport_prologue(pp) < 0) 339 return; 340 mos7715_change_mode(mos_parport, SPP); 341 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d); 342 parport_epilogue(pp); 343} 344 345static unsigned char parport_mos7715_read_data(struct parport *pp) 346{ 347 struct mos7715_parport *mos_parport = pp->private_data; 348 unsigned char d; 349 350 if (parport_prologue(pp) < 0) 351 return 0; 352 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d); 353 parport_epilogue(pp); 354 return d; 355} 356 357static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 358{ 359 struct mos7715_parport *mos_parport = pp->private_data; 360 __u8 data; 361 362 if (parport_prologue(pp) < 0) 363 return; 364 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); 365 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data); 366 mos_parport->shadowDCR = data; 367 parport_epilogue(pp); 368} 369 370static unsigned char parport_mos7715_read_control(struct parport *pp) 371{ 372 struct mos7715_parport *mos_parport; 373 __u8 dcr; 374 375 spin_lock(&release_lock); 376 mos_parport = pp->private_data; 377 if (unlikely(mos_parport == NULL)) { 378 spin_unlock(&release_lock); 379 return 0; 380 } 381 dcr = mos_parport->shadowDCR & 0x0f; 382 spin_unlock(&release_lock); 383 return dcr; 384} 385 386static unsigned char parport_mos7715_frob_control(struct parport *pp, 387 unsigned char mask, 388 unsigned char val) 389{ 390 struct mos7715_parport *mos_parport = pp->private_data; 391 __u8 dcr; 392 393 mask &= 0x0f; 394 val &= 0x0f; 395 if (parport_prologue(pp) < 0) 396 return 0; 397 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; 398 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 399 mos_parport->shadowDCR); 400 dcr = mos_parport->shadowDCR & 0x0f; 401 parport_epilogue(pp); 402 return dcr; 403} 404 405static unsigned char parport_mos7715_read_status(struct parport *pp) 406{ 407 unsigned char status; 408 struct mos7715_parport *mos_parport; 409 410 spin_lock(&release_lock); 411 mos_parport = pp->private_data; 412 if (unlikely(mos_parport == NULL)) { /* release called */ 413 spin_unlock(&release_lock); 414 return 0; 415 } 416 status = atomic_read(&mos_parport->shadowDSR) & 0xf8; 417 spin_unlock(&release_lock); 418 return status; 419} 420 421static void parport_mos7715_enable_irq(struct parport *pp) 422{ 423} 424 425static void parport_mos7715_disable_irq(struct parport *pp) 426{ 427} 428 429static void parport_mos7715_data_forward(struct parport *pp) 430{ 431 struct mos7715_parport *mos_parport = pp->private_data; 432 433 if (parport_prologue(pp) < 0) 434 return; 435 mos7715_change_mode(mos_parport, PS2); 436 mos_parport->shadowDCR &= ~0x20; 437 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 438 mos_parport->shadowDCR); 439 parport_epilogue(pp); 440} 441 442static void parport_mos7715_data_reverse(struct parport *pp) 443{ 444 struct mos7715_parport *mos_parport = pp->private_data; 445 446 if (parport_prologue(pp) < 0) 447 return; 448 mos7715_change_mode(mos_parport, PS2); 449 mos_parport->shadowDCR |= 0x20; 450 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 451 mos_parport->shadowDCR); 452 parport_epilogue(pp); 453} 454 455static void parport_mos7715_init_state(struct pardevice *dev, 456 struct parport_state *s) 457{ 458 s->u.pc.ctr = DCR_INIT_VAL; 459 s->u.pc.ecr = ECR_INIT_VAL; 460} 461 462/* N.B. Parport core code requires that this function not block */ 463static void parport_mos7715_save_state(struct parport *pp, 464 struct parport_state *s) 465{ 466 struct mos7715_parport *mos_parport; 467 468 spin_lock(&release_lock); 469 mos_parport = pp->private_data; 470 if (unlikely(mos_parport == NULL)) { /* release called */ 471 spin_unlock(&release_lock); 472 return; 473 } 474 s->u.pc.ctr = mos_parport->shadowDCR; 475 s->u.pc.ecr = mos_parport->shadowECR; 476 spin_unlock(&release_lock); 477} 478 479/* N.B. Parport core code requires that this function not block */ 480static void parport_mos7715_restore_state(struct parport *pp, 481 struct parport_state *s) 482{ 483 struct mos7715_parport *mos_parport; 484 485 spin_lock(&release_lock); 486 mos_parport = pp->private_data; 487 if (unlikely(mos_parport == NULL)) { /* release called */ 488 spin_unlock(&release_lock); 489 return; 490 } 491 mos_parport->shadowDCR = s->u.pc.ctr; 492 mos_parport->shadowECR = s->u.pc.ecr; 493 494 schedule_work(&mos_parport->work); 495 spin_unlock(&release_lock); 496} 497 498static size_t parport_mos7715_write_compat(struct parport *pp, 499 const void *buffer, 500 size_t len, int flags) 501{ 502 int retval; 503 struct mos7715_parport *mos_parport = pp->private_data; 504 int actual_len; 505 506 if (parport_prologue(pp) < 0) 507 return 0; 508 mos7715_change_mode(mos_parport, PPF); 509 retval = usb_bulk_msg(mos_parport->serial->dev, 510 usb_sndbulkpipe(mos_parport->serial->dev, 2), 511 (void *)buffer, len, &actual_len, 512 MOS_WDR_TIMEOUT); 513 parport_epilogue(pp); 514 if (retval) { 515 dev_err(&mos_parport->serial->dev->dev, 516 "mos7720: usb_bulk_msg() failed: %d\n", retval); 517 return 0; 518 } 519 return actual_len; 520} 521 522static struct parport_operations parport_mos7715_ops = { 523 .owner = THIS_MODULE, 524 .write_data = parport_mos7715_write_data, 525 .read_data = parport_mos7715_read_data, 526 527 .write_control = parport_mos7715_write_control, 528 .read_control = parport_mos7715_read_control, 529 .frob_control = parport_mos7715_frob_control, 530 531 .read_status = parport_mos7715_read_status, 532 533 .enable_irq = parport_mos7715_enable_irq, 534 .disable_irq = parport_mos7715_disable_irq, 535 536 .data_forward = parport_mos7715_data_forward, 537 .data_reverse = parport_mos7715_data_reverse, 538 539 .init_state = parport_mos7715_init_state, 540 .save_state = parport_mos7715_save_state, 541 .restore_state = parport_mos7715_restore_state, 542 543 .compat_write_data = parport_mos7715_write_compat, 544 545 .nibble_read_data = parport_ieee1284_read_nibble, 546 .byte_read_data = parport_ieee1284_read_byte, 547}; 548 549/* 550 * Allocate and initialize parallel port control struct, initialize 551 * the parallel port hardware device, and register with the parport subsystem. 552 */ 553static int mos7715_parport_init(struct usb_serial *serial) 554{ 555 struct mos7715_parport *mos_parport; 556 557 /* allocate and initialize parallel port control struct */ 558 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); 559 if (!mos_parport) 560 return -ENOMEM; 561 562 mos_parport->msg_pending = false; 563 kref_init(&mos_parport->ref_count); 564 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ 565 mos_parport->serial = serial; 566 INIT_WORK(&mos_parport->work, deferred_restore_writes); 567 init_completion(&mos_parport->syncmsg_compl); 568 569 /* cycle parallel port reset bit */ 570 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80); 571 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00); 572 573 /* initialize device registers */ 574 mos_parport->shadowDCR = DCR_INIT_VAL; 575 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, 576 mos_parport->shadowDCR); 577 mos_parport->shadowECR = ECR_INIT_VAL; 578 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, 579 mos_parport->shadowECR); 580 581 /* register with parport core */ 582 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, 583 PARPORT_DMA_NONE, 584 &parport_mos7715_ops); 585 if (mos_parport->pp == NULL) { 586 dev_err(&serial->interface->dev, 587 "Could not register parport\n"); 588 kref_put(&mos_parport->ref_count, destroy_mos_parport); 589 return -EIO; 590 } 591 mos_parport->pp->private_data = mos_parport; 592 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; 593 mos_parport->pp->dev = &serial->interface->dev; 594 parport_announce_port(mos_parport->pp); 595 596 return 0; 597} 598#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 599 600/* 601 * mos7720_interrupt_callback 602 * this is the callback function for when we have received data on the 603 * interrupt endpoint. 604 */ 605static void mos7720_interrupt_callback(struct urb *urb) 606{ 607 int result; 608 int length; 609 int status = urb->status; 610 struct device *dev = &urb->dev->dev; 611 __u8 *data; 612 __u8 sp1; 613 __u8 sp2; 614 615 switch (status) { 616 case 0: 617 /* success */ 618 break; 619 case -ECONNRESET: 620 case -ENOENT: 621 case -ESHUTDOWN: 622 /* this urb is terminated, clean up */ 623 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 624 return; 625 default: 626 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 627 goto exit; 628 } 629 630 length = urb->actual_length; 631 data = urb->transfer_buffer; 632 633 /* Moschip get 4 bytes 634 * Byte 1 IIR Port 1 (port.number is 0) 635 * Byte 2 IIR Port 2 (port.number is 1) 636 * Byte 3 -------------- 637 * Byte 4 FIFO status for both */ 638 639 /* the above description is inverted 640 * oneukum 2007-03-14 */ 641 642 if (unlikely(length != 4)) { 643 dev_dbg(dev, "Wrong data !!!\n"); 644 return; 645 } 646 647 sp1 = data[3]; 648 sp2 = data[2]; 649 650 if ((sp1 | sp2) & 0x01) { 651 /* No Interrupt Pending in both the ports */ 652 dev_dbg(dev, "No Interrupt !!!\n"); 653 } else { 654 switch (sp1 & 0x0f) { 655 case SERIAL_IIR_RLS: 656 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); 657 break; 658 case SERIAL_IIR_CTI: 659 dev_dbg(dev, "Serial Port 1: Receiver time out\n"); 660 break; 661 case SERIAL_IIR_MS: 662 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ 663 break; 664 } 665 666 switch (sp2 & 0x0f) { 667 case SERIAL_IIR_RLS: 668 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); 669 break; 670 case SERIAL_IIR_CTI: 671 dev_dbg(dev, "Serial Port 2: Receiver time out\n"); 672 break; 673 case SERIAL_IIR_MS: 674 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ 675 break; 676 } 677 } 678 679exit: 680 result = usb_submit_urb(urb, GFP_ATOMIC); 681 if (result) 682 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 683} 684 685/* 686 * mos7715_interrupt_callback 687 * this is the 7715's callback function for when we have received data on 688 * the interrupt endpoint. 689 */ 690static void mos7715_interrupt_callback(struct urb *urb) 691{ 692 int result; 693 int length; 694 int status = urb->status; 695 struct device *dev = &urb->dev->dev; 696 __u8 *data; 697 __u8 iir; 698 699 switch (status) { 700 case 0: 701 /* success */ 702 break; 703 case -ECONNRESET: 704 case -ENOENT: 705 case -ESHUTDOWN: 706 case -ENODEV: 707 /* this urb is terminated, clean up */ 708 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 709 return; 710 default: 711 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 712 goto exit; 713 } 714 715 length = urb->actual_length; 716 data = urb->transfer_buffer; 717 718 /* Structure of data from 7715 device: 719 * Byte 1: IIR serial Port 720 * Byte 2: unused 721 * Byte 2: DSR parallel port 722 * Byte 4: FIFO status for both */ 723 724 if (unlikely(length != 4)) { 725 dev_dbg(dev, "Wrong data !!!\n"); 726 return; 727 } 728 729 iir = data[0]; 730 if (!(iir & 0x01)) { /* serial port interrupt pending */ 731 switch (iir & 0x0f) { 732 case SERIAL_IIR_RLS: 733 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n"); 734 break; 735 case SERIAL_IIR_CTI: 736 dev_dbg(dev, "Serial Port: Receiver time out\n"); 737 break; 738 case SERIAL_IIR_MS: 739 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ 740 break; 741 } 742 } 743 744#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 745 { /* update local copy of DSR reg */ 746 struct usb_serial_port *port = urb->context; 747 struct mos7715_parport *mos_parport = port->serial->private; 748 if (unlikely(mos_parport == NULL)) 749 return; 750 atomic_set(&mos_parport->shadowDSR, data[2]); 751 } 752#endif 753 754exit: 755 result = usb_submit_urb(urb, GFP_ATOMIC); 756 if (result) 757 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); 758} 759 760/* 761 * mos7720_bulk_in_callback 762 * this is the callback function for when we have received data on the 763 * bulk in endpoint. 764 */ 765static void mos7720_bulk_in_callback(struct urb *urb) 766{ 767 int retval; 768 unsigned char *data ; 769 struct usb_serial_port *port; 770 int status = urb->status; 771 772 if (status) { 773 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 774 return; 775 } 776 777 port = urb->context; 778 779 dev_dbg(&port->dev, "Entering...%s\n", __func__); 780 781 data = urb->transfer_buffer; 782 783 if (urb->actual_length) { 784 tty_insert_flip_string(&port->port, data, urb->actual_length); 785 tty_flip_buffer_push(&port->port); 786 } 787 788 if (port->read_urb->status != -EINPROGRESS) { 789 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 790 if (retval) 791 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 792 } 793} 794 795/* 796 * mos7720_bulk_out_data_callback 797 * this is the callback function for when we have finished sending serial 798 * data on the bulk out endpoint. 799 */ 800static void mos7720_bulk_out_data_callback(struct urb *urb) 801{ 802 struct moschip_port *mos7720_port; 803 int status = urb->status; 804 805 if (status) { 806 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); 807 return; 808 } 809 810 mos7720_port = urb->context; 811 if (!mos7720_port) { 812 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); 813 return ; 814 } 815 816 if (mos7720_port->open) 817 tty_port_tty_wakeup(&mos7720_port->port->port); 818} 819 820static int mos77xx_calc_num_ports(struct usb_serial *serial, 821 struct usb_serial_endpoints *epds) 822{ 823 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 824 825 if (product == MOSCHIP_DEVICE_ID_7715) { 826 /* 827 * The 7715 uses the first bulk in/out endpoint pair for the 828 * parallel port, and the second for the serial port. We swap 829 * the endpoint descriptors here so that the first and 830 * only registered port structure uses the serial-port 831 * endpoints. 832 */ 833 swap(epds->bulk_in[0], epds->bulk_in[1]); 834 swap(epds->bulk_out[0], epds->bulk_out[1]); 835 836 return 1; 837 } 838 839 return 2; 840} 841 842static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 843{ 844 struct usb_serial *serial; 845 struct urb *urb; 846 struct moschip_port *mos7720_port; 847 int response; 848 int port_number; 849 __u8 data; 850 int allocated_urbs = 0; 851 int j; 852 853 serial = port->serial; 854 855 mos7720_port = usb_get_serial_port_data(port); 856 if (mos7720_port == NULL) 857 return -ENODEV; 858 859 usb_clear_halt(serial->dev, port->write_urb->pipe); 860 usb_clear_halt(serial->dev, port->read_urb->pipe); 861 862 /* Initialising the write urb pool */ 863 for (j = 0; j < NUM_URBS; ++j) { 864 urb = usb_alloc_urb(0, GFP_KERNEL); 865 mos7720_port->write_urb_pool[j] = urb; 866 if (!urb) 867 continue; 868 869 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 870 GFP_KERNEL); 871 if (!urb->transfer_buffer) { 872 usb_free_urb(mos7720_port->write_urb_pool[j]); 873 mos7720_port->write_urb_pool[j] = NULL; 874 continue; 875 } 876 allocated_urbs++; 877 } 878 879 if (!allocated_urbs) 880 return -ENOMEM; 881 882 /* Initialize MCS7720 -- Write Init values to corresponding Registers 883 * 884 * Register Index 885 * 0 : MOS7720_THR/MOS7720_RHR 886 * 1 : MOS7720_IER 887 * 2 : MOS7720_FCR 888 * 3 : MOS7720_LCR 889 * 4 : MOS7720_MCR 890 * 5 : MOS7720_LSR 891 * 6 : MOS7720_MSR 892 * 7 : MOS7720_SPR 893 * 894 * 0x08 : SP1/2 Control Reg 895 */ 896 port_number = port->port_number; 897 read_mos_reg(serial, port_number, MOS7720_LSR, &data); 898 899 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); 900 901 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02); 902 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02); 903 904 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 905 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 906 907 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 908 mos7720_port->shadowLCR = 0x03; 909 write_mos_reg(serial, port_number, MOS7720_LCR, 910 mos7720_port->shadowLCR); 911 mos7720_port->shadowMCR = 0x0b; 912 write_mos_reg(serial, port_number, MOS7720_MCR, 913 mos7720_port->shadowMCR); 914 915 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00); 916 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data); 917 data = data | (port->port_number + 1); 918 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data); 919 mos7720_port->shadowLCR = 0x83; 920 write_mos_reg(serial, port_number, MOS7720_LCR, 921 mos7720_port->shadowLCR); 922 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c); 923 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 924 mos7720_port->shadowLCR = 0x03; 925 write_mos_reg(serial, port_number, MOS7720_LCR, 926 mos7720_port->shadowLCR); 927 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 928 929 response = usb_submit_urb(port->read_urb, GFP_KERNEL); 930 if (response) 931 dev_err(&port->dev, "%s - Error %d submitting read urb\n", 932 __func__, response); 933 934 /* initialize our port settings */ 935 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ 936 937 /* send a open port command */ 938 mos7720_port->open = 1; 939 940 return 0; 941} 942 943/* 944 * mos7720_chars_in_buffer 945 * this function is called by the tty driver when it wants to know how many 946 * bytes of data we currently have outstanding in the port (data that has 947 * been written, but hasn't made it out the port yet) 948 */ 949static unsigned int mos7720_chars_in_buffer(struct tty_struct *tty) 950{ 951 struct usb_serial_port *port = tty->driver_data; 952 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 953 int i; 954 unsigned int chars = 0; 955 956 for (i = 0; i < NUM_URBS; ++i) { 957 if (mos7720_port->write_urb_pool[i] && 958 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 959 chars += URB_TRANSFER_BUFFER_SIZE; 960 } 961 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars); 962 return chars; 963} 964 965static void mos7720_close(struct usb_serial_port *port) 966{ 967 struct usb_serial *serial; 968 struct moschip_port *mos7720_port; 969 int j; 970 971 serial = port->serial; 972 973 mos7720_port = usb_get_serial_port_data(port); 974 if (mos7720_port == NULL) 975 return; 976 977 for (j = 0; j < NUM_URBS; ++j) 978 usb_kill_urb(mos7720_port->write_urb_pool[j]); 979 980 /* Freeing Write URBs */ 981 for (j = 0; j < NUM_URBS; ++j) { 982 if (mos7720_port->write_urb_pool[j]) { 983 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 984 usb_free_urb(mos7720_port->write_urb_pool[j]); 985 } 986 } 987 988 /* While closing port, shutdown all bulk read, write * 989 * and interrupt read if they exists, otherwise nop */ 990 usb_kill_urb(port->write_urb); 991 usb_kill_urb(port->read_urb); 992 993 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); 994 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); 995 996 mos7720_port->open = 0; 997} 998 999static int mos7720_break(struct tty_struct *tty, int break_state) 1000{ 1001 struct usb_serial_port *port = tty->driver_data; 1002 unsigned char data; 1003 struct usb_serial *serial; 1004 struct moschip_port *mos7720_port; 1005 1006 serial = port->serial; 1007 1008 mos7720_port = usb_get_serial_port_data(port); 1009 if (mos7720_port == NULL) 1010 return -ENODEV; 1011 1012 if (break_state == -1) 1013 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1014 else 1015 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1016 1017 mos7720_port->shadowLCR = data; 1018 1019 return write_mos_reg(serial, port->port_number, MOS7720_LCR, 1020 mos7720_port->shadowLCR); 1021} 1022 1023/* 1024 * mos7720_write_room 1025 * this function is called by the tty driver when it wants to know how many 1026 * bytes of data we can accept for a specific port. 1027 */ 1028static unsigned int mos7720_write_room(struct tty_struct *tty) 1029{ 1030 struct usb_serial_port *port = tty->driver_data; 1031 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1032 unsigned int room = 0; 1033 int i; 1034 1035 /* FIXME: Locking */ 1036 for (i = 0; i < NUM_URBS; ++i) { 1037 if (mos7720_port->write_urb_pool[i] && 1038 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1039 room += URB_TRANSFER_BUFFER_SIZE; 1040 } 1041 1042 dev_dbg(&port->dev, "%s - returns %u\n", __func__, room); 1043 return room; 1044} 1045 1046static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1047 const unsigned char *data, int count) 1048{ 1049 int status; 1050 int i; 1051 int bytes_sent = 0; 1052 int transfer_size; 1053 1054 struct moschip_port *mos7720_port; 1055 struct usb_serial *serial; 1056 struct urb *urb; 1057 const unsigned char *current_position = data; 1058 1059 serial = port->serial; 1060 1061 mos7720_port = usb_get_serial_port_data(port); 1062 if (mos7720_port == NULL) 1063 return -ENODEV; 1064 1065 /* try to find a free urb in the list */ 1066 urb = NULL; 1067 1068 for (i = 0; i < NUM_URBS; ++i) { 1069 if (mos7720_port->write_urb_pool[i] && 1070 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1071 urb = mos7720_port->write_urb_pool[i]; 1072 dev_dbg(&port->dev, "URB:%d\n", i); 1073 break; 1074 } 1075 } 1076 1077 if (urb == NULL) { 1078 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1079 goto exit; 1080 } 1081 1082 if (urb->transfer_buffer == NULL) { 1083 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1084 GFP_ATOMIC); 1085 if (!urb->transfer_buffer) { 1086 bytes_sent = -ENOMEM; 1087 goto exit; 1088 } 1089 } 1090 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1091 1092 memcpy(urb->transfer_buffer, current_position, transfer_size); 1093 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1094 urb->transfer_buffer); 1095 1096 /* fill urb with data and submit */ 1097 usb_fill_bulk_urb(urb, serial->dev, 1098 usb_sndbulkpipe(serial->dev, 1099 port->bulk_out_endpointAddress), 1100 urb->transfer_buffer, transfer_size, 1101 mos7720_bulk_out_data_callback, mos7720_port); 1102 1103 /* send it down the pipe */ 1104 status = usb_submit_urb(urb, GFP_ATOMIC); 1105 if (status) { 1106 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1107 "with status = %d\n", __func__, status); 1108 bytes_sent = status; 1109 goto exit; 1110 } 1111 bytes_sent = transfer_size; 1112 1113exit: 1114 return bytes_sent; 1115} 1116 1117static void mos7720_throttle(struct tty_struct *tty) 1118{ 1119 struct usb_serial_port *port = tty->driver_data; 1120 struct moschip_port *mos7720_port; 1121 int status; 1122 1123 mos7720_port = usb_get_serial_port_data(port); 1124 1125 if (mos7720_port == NULL) 1126 return; 1127 1128 if (!mos7720_port->open) { 1129 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1130 return; 1131 } 1132 1133 /* if we are implementing XON/XOFF, send the stop character */ 1134 if (I_IXOFF(tty)) { 1135 unsigned char stop_char = STOP_CHAR(tty); 1136 status = mos7720_write(tty, port, &stop_char, 1); 1137 if (status <= 0) 1138 return; 1139 } 1140 1141 /* if we are implementing RTS/CTS, toggle that line */ 1142 if (C_CRTSCTS(tty)) { 1143 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1144 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1145 mos7720_port->shadowMCR); 1146 } 1147} 1148 1149static void mos7720_unthrottle(struct tty_struct *tty) 1150{ 1151 struct usb_serial_port *port = tty->driver_data; 1152 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1153 int status; 1154 1155 if (mos7720_port == NULL) 1156 return; 1157 1158 if (!mos7720_port->open) { 1159 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1160 return; 1161 } 1162 1163 /* if we are implementing XON/XOFF, send the start character */ 1164 if (I_IXOFF(tty)) { 1165 unsigned char start_char = START_CHAR(tty); 1166 status = mos7720_write(tty, port, &start_char, 1); 1167 if (status <= 0) 1168 return; 1169 } 1170 1171 /* if we are implementing RTS/CTS, toggle that line */ 1172 if (C_CRTSCTS(tty)) { 1173 mos7720_port->shadowMCR |= UART_MCR_RTS; 1174 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1175 mos7720_port->shadowMCR); 1176 } 1177} 1178 1179/* FIXME: this function does not work */ 1180static int set_higher_rates(struct moschip_port *mos7720_port, 1181 unsigned int baud) 1182{ 1183 struct usb_serial_port *port; 1184 struct usb_serial *serial; 1185 int port_number; 1186 enum mos_regs sp_reg; 1187 if (mos7720_port == NULL) 1188 return -EINVAL; 1189 1190 port = mos7720_port->port; 1191 serial = port->serial; 1192 1193 /*********************************************** 1194 * Init Sequence for higher rates 1195 ***********************************************/ 1196 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1197 port_number = port->port_number; 1198 1199 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1200 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1201 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1202 mos7720_port->shadowMCR = 0x0b; 1203 write_mos_reg(serial, port_number, MOS7720_MCR, 1204 mos7720_port->shadowMCR); 1205 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1206 1207 /*********************************************** 1208 * Set for higher rates * 1209 ***********************************************/ 1210 /* writing baud rate verbatum into uart clock field clearly not right */ 1211 if (port_number == 0) 1212 sp_reg = MOS7720_SP1_REG; 1213 else 1214 sp_reg = MOS7720_SP2_REG; 1215 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1216 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1217 mos7720_port->shadowMCR = 0x2b; 1218 write_mos_reg(serial, port_number, MOS7720_MCR, 1219 mos7720_port->shadowMCR); 1220 1221 /*********************************************** 1222 * Set DLL/DLM 1223 ***********************************************/ 1224 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1225 write_mos_reg(serial, port_number, MOS7720_LCR, 1226 mos7720_port->shadowLCR); 1227 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1228 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1229 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1230 write_mos_reg(serial, port_number, MOS7720_LCR, 1231 mos7720_port->shadowLCR); 1232 1233 return 0; 1234} 1235 1236/* baud rate information */ 1237struct divisor_table_entry { 1238 __u32 baudrate; 1239 __u16 divisor; 1240}; 1241 1242/* Define table of divisors for moschip 7720 hardware * 1243 * These assume a 3.6864MHz crystal, the standard /16, and * 1244 * MCR.7 = 0. */ 1245static const struct divisor_table_entry divisor_table[] = { 1246 { 50, 2304}, 1247 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1248 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1249 { 150, 768}, 1250 { 300, 384}, 1251 { 600, 192}, 1252 { 1200, 96}, 1253 { 1800, 64}, 1254 { 2400, 48}, 1255 { 4800, 24}, 1256 { 7200, 16}, 1257 { 9600, 12}, 1258 { 19200, 6}, 1259 { 38400, 3}, 1260 { 57600, 2}, 1261 { 115200, 1}, 1262}; 1263 1264/***************************************************************************** 1265 * calc_baud_rate_divisor 1266 * this function calculates the proper baud rate divisor for the specified 1267 * baud rate. 1268 *****************************************************************************/ 1269static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1270{ 1271 int i; 1272 __u16 custom; 1273 __u16 round1; 1274 __u16 round; 1275 1276 1277 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1278 1279 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1280 if (divisor_table[i].baudrate == baudrate) { 1281 *divisor = divisor_table[i].divisor; 1282 return 0; 1283 } 1284 } 1285 1286 /* After trying for all the standard baud rates * 1287 * Try calculating the divisor for this baud rate */ 1288 if (baudrate > 75 && baudrate < 230400) { 1289 /* get the divisor */ 1290 custom = (__u16)(230400L / baudrate); 1291 1292 /* Check for round off */ 1293 round1 = (__u16)(2304000L / baudrate); 1294 round = (__u16)(round1 - (custom * 10)); 1295 if (round > 4) 1296 custom++; 1297 *divisor = custom; 1298 1299 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1300 return 0; 1301 } 1302 1303 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1304 return -EINVAL; 1305} 1306 1307/* 1308 * send_cmd_write_baud_rate 1309 * this function sends the proper command to change the baud rate of the 1310 * specified port. 1311 */ 1312static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1313 int baudrate) 1314{ 1315 struct usb_serial_port *port; 1316 struct usb_serial *serial; 1317 int divisor; 1318 int status; 1319 unsigned char number; 1320 1321 if (mos7720_port == NULL) 1322 return -1; 1323 1324 port = mos7720_port->port; 1325 serial = port->serial; 1326 1327 number = port->port_number; 1328 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1329 1330 /* Calculate the Divisor */ 1331 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1332 if (status) { 1333 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1334 return status; 1335 } 1336 1337 /* Enable access to divisor latch */ 1338 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1339 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1340 1341 /* Write the divisor */ 1342 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1343 write_mos_reg(serial, number, MOS7720_DLM, 1344 (__u8)((divisor & 0xff00) >> 8)); 1345 1346 /* Disable access to divisor latch */ 1347 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1348 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1349 1350 return status; 1351} 1352 1353/* 1354 * change_port_settings 1355 * This routine is called to set the UART on the device to match 1356 * the specified new settings. 1357 */ 1358static void change_port_settings(struct tty_struct *tty, 1359 struct moschip_port *mos7720_port, 1360 const struct ktermios *old_termios) 1361{ 1362 struct usb_serial_port *port; 1363 struct usb_serial *serial; 1364 int baud; 1365 unsigned cflag; 1366 __u8 lData; 1367 __u8 lParity; 1368 __u8 lStop; 1369 int status; 1370 int port_number; 1371 1372 if (mos7720_port == NULL) 1373 return ; 1374 1375 port = mos7720_port->port; 1376 serial = port->serial; 1377 port_number = port->port_number; 1378 1379 if (!mos7720_port->open) { 1380 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1381 return; 1382 } 1383 1384 lStop = 0x00; /* 1 stop bit */ 1385 lParity = 0x00; /* No parity */ 1386 1387 cflag = tty->termios.c_cflag; 1388 1389 lData = UART_LCR_WLEN(tty_get_char_size(cflag)); 1390 1391 /* Change the Parity bit */ 1392 if (cflag & PARENB) { 1393 if (cflag & PARODD) { 1394 lParity = UART_LCR_PARITY; 1395 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1396 } else { 1397 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1398 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1399 } 1400 1401 } else { 1402 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1403 } 1404 1405 if (cflag & CMSPAR) 1406 lParity = lParity | 0x20; 1407 1408 /* Change the Stop bit */ 1409 if (cflag & CSTOPB) { 1410 lStop = UART_LCR_STOP; 1411 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1412 } else { 1413 lStop = 0x00; 1414 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1415 } 1416 1417#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1418#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1419#define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1420 1421 /* Update the LCR with the correct value */ 1422 mos7720_port->shadowLCR &= 1423 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1424 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1425 1426 1427 /* Disable Interrupts */ 1428 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1429 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1430 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1431 1432 /* Send the updated LCR value to the mos7720 */ 1433 write_mos_reg(serial, port_number, MOS7720_LCR, 1434 mos7720_port->shadowLCR); 1435 mos7720_port->shadowMCR = 0x0b; 1436 write_mos_reg(serial, port_number, MOS7720_MCR, 1437 mos7720_port->shadowMCR); 1438 1439 /* set up the MCR register and send it to the mos7720 */ 1440 mos7720_port->shadowMCR = UART_MCR_OUT2; 1441 if (cflag & CBAUD) 1442 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1443 1444 if (cflag & CRTSCTS) { 1445 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1446 /* To set hardware flow control to the specified * 1447 * serial port, in SP1/2_CONTROL_REG */ 1448 if (port_number) 1449 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1450 0x01); 1451 else 1452 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1453 0x02); 1454 1455 } else 1456 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1457 1458 write_mos_reg(serial, port_number, MOS7720_MCR, 1459 mos7720_port->shadowMCR); 1460 1461 /* Determine divisor based on baud rate */ 1462 baud = tty_get_baud_rate(tty); 1463 if (!baud) { 1464 /* pick a default, any default... */ 1465 dev_dbg(&port->dev, "Picked default baud...\n"); 1466 baud = 9600; 1467 } 1468 1469 if (baud >= 230400) { 1470 set_higher_rates(mos7720_port, baud); 1471 /* Enable Interrupts */ 1472 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1473 return; 1474 } 1475 1476 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1477 status = send_cmd_write_baud_rate(mos7720_port, baud); 1478 /* FIXME: needs to write actual resulting baud back not just 1479 blindly do so */ 1480 if (cflag & CBAUD) 1481 tty_encode_baud_rate(tty, baud, baud); 1482 /* Enable Interrupts */ 1483 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1484 1485 if (port->read_urb->status != -EINPROGRESS) { 1486 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1487 if (status) 1488 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1489 } 1490} 1491 1492/* 1493 * mos7720_set_termios 1494 * this function is called by the tty driver when it wants to change the 1495 * termios structure. 1496 */ 1497static void mos7720_set_termios(struct tty_struct *tty, 1498 struct usb_serial_port *port, 1499 const struct ktermios *old_termios) 1500{ 1501 int status; 1502 struct moschip_port *mos7720_port; 1503 1504 mos7720_port = usb_get_serial_port_data(port); 1505 1506 if (mos7720_port == NULL) 1507 return; 1508 1509 if (!mos7720_port->open) { 1510 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1511 return; 1512 } 1513 1514 /* change the port settings to the new ones specified */ 1515 change_port_settings(tty, mos7720_port, old_termios); 1516 1517 if (port->read_urb->status != -EINPROGRESS) { 1518 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1519 if (status) 1520 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1521 } 1522} 1523 1524/* 1525 * get_lsr_info - get line status register info 1526 * 1527 * Purpose: Let user call ioctl() to get info when the UART physically 1528 * is emptied. On bus types like RS485, the transmitter must 1529 * release the bus after transmitting. This must be done when 1530 * the transmit shift register is empty, not be done when the 1531 * transmit holding register is empty. This functionality 1532 * allows an RS485 driver to be written in user space. 1533 */ 1534static int get_lsr_info(struct tty_struct *tty, 1535 struct moschip_port *mos7720_port, unsigned int __user *value) 1536{ 1537 struct usb_serial_port *port = tty->driver_data; 1538 unsigned int result = 0; 1539 unsigned char data = 0; 1540 int port_number = port->port_number; 1541 int count; 1542 1543 count = mos7720_chars_in_buffer(tty); 1544 if (count == 0) { 1545 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1546 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1547 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1548 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1549 result = TIOCSER_TEMT; 1550 } 1551 } 1552 if (copy_to_user(value, &result, sizeof(int))) 1553 return -EFAULT; 1554 return 0; 1555} 1556 1557static int mos7720_tiocmget(struct tty_struct *tty) 1558{ 1559 struct usb_serial_port *port = tty->driver_data; 1560 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1561 unsigned int result = 0; 1562 unsigned int mcr ; 1563 unsigned int msr ; 1564 1565 mcr = mos7720_port->shadowMCR; 1566 msr = mos7720_port->shadowMSR; 1567 1568 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1569 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1570 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1571 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1572 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1573 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1574 1575 return result; 1576} 1577 1578static int mos7720_tiocmset(struct tty_struct *tty, 1579 unsigned int set, unsigned int clear) 1580{ 1581 struct usb_serial_port *port = tty->driver_data; 1582 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1583 unsigned int mcr ; 1584 1585 mcr = mos7720_port->shadowMCR; 1586 1587 if (set & TIOCM_RTS) 1588 mcr |= UART_MCR_RTS; 1589 if (set & TIOCM_DTR) 1590 mcr |= UART_MCR_DTR; 1591 if (set & TIOCM_LOOP) 1592 mcr |= UART_MCR_LOOP; 1593 1594 if (clear & TIOCM_RTS) 1595 mcr &= ~UART_MCR_RTS; 1596 if (clear & TIOCM_DTR) 1597 mcr &= ~UART_MCR_DTR; 1598 if (clear & TIOCM_LOOP) 1599 mcr &= ~UART_MCR_LOOP; 1600 1601 mos7720_port->shadowMCR = mcr; 1602 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1603 mos7720_port->shadowMCR); 1604 1605 return 0; 1606} 1607 1608static int mos7720_ioctl(struct tty_struct *tty, 1609 unsigned int cmd, unsigned long arg) 1610{ 1611 struct usb_serial_port *port = tty->driver_data; 1612 struct moschip_port *mos7720_port; 1613 1614 mos7720_port = usb_get_serial_port_data(port); 1615 if (mos7720_port == NULL) 1616 return -ENODEV; 1617 1618 switch (cmd) { 1619 case TIOCSERGETLSR: 1620 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1621 return get_lsr_info(tty, mos7720_port, 1622 (unsigned int __user *)arg); 1623 } 1624 1625 return -ENOIOCTLCMD; 1626} 1627 1628static int mos7720_startup(struct usb_serial *serial) 1629{ 1630 struct usb_device *dev; 1631 char data; 1632 u16 product; 1633 int ret_val; 1634 1635 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1636 dev = serial->dev; 1637 1638 if (product == MOSCHIP_DEVICE_ID_7715) { 1639 struct urb *urb = serial->port[0]->interrupt_in_urb; 1640 1641 urb->complete = mos7715_interrupt_callback; 1642 1643#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1644 ret_val = mos7715_parport_init(serial); 1645 if (ret_val < 0) 1646 return ret_val; 1647#endif 1648 } 1649 /* start the interrupt urb */ 1650 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1651 if (ret_val) { 1652 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", 1653 ret_val); 1654 } 1655 1656 /* LSR For Port 1 */ 1657 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1658 dev_dbg(&dev->dev, "LSR:%x\n", data); 1659 1660 return 0; 1661} 1662 1663static void mos7720_release(struct usb_serial *serial) 1664{ 1665 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1666 1667#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1668 /* close the parallel port */ 1669 1670 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1671 == MOSCHIP_DEVICE_ID_7715) { 1672 struct mos7715_parport *mos_parport = 1673 usb_get_serial_data(serial); 1674 1675 /* prevent NULL ptr dereference in port callbacks */ 1676 spin_lock(&release_lock); 1677 mos_parport->pp->private_data = NULL; 1678 spin_unlock(&release_lock); 1679 1680 /* wait for synchronous usb calls to return */ 1681 if (mos_parport->msg_pending) 1682 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1683 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1684 /* 1685 * If delayed work is currently scheduled, wait for it to 1686 * complete. This also implies barriers that ensure the 1687 * below serial clearing is not hoisted above the ->work. 1688 */ 1689 cancel_work_sync(&mos_parport->work); 1690 1691 parport_remove_port(mos_parport->pp); 1692 usb_set_serial_data(serial, NULL); 1693 mos_parport->serial = NULL; 1694 1695 parport_del_port(mos_parport->pp); 1696 1697 kref_put(&mos_parport->ref_count, destroy_mos_parport); 1698 } 1699#endif 1700} 1701 1702static int mos7720_port_probe(struct usb_serial_port *port) 1703{ 1704 struct moschip_port *mos7720_port; 1705 1706 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 1707 if (!mos7720_port) 1708 return -ENOMEM; 1709 1710 mos7720_port->port = port; 1711 1712 usb_set_serial_port_data(port, mos7720_port); 1713 1714 return 0; 1715} 1716 1717static void mos7720_port_remove(struct usb_serial_port *port) 1718{ 1719 struct moschip_port *mos7720_port; 1720 1721 mos7720_port = usb_get_serial_port_data(port); 1722 kfree(mos7720_port); 1723} 1724 1725static struct usb_serial_driver moschip7720_2port_driver = { 1726 .driver = { 1727 .owner = THIS_MODULE, 1728 .name = "moschip7720", 1729 }, 1730 .description = "Moschip 2 port adapter", 1731 .id_table = id_table, 1732 .num_bulk_in = 2, 1733 .num_bulk_out = 2, 1734 .num_interrupt_in = 1, 1735 .calc_num_ports = mos77xx_calc_num_ports, 1736 .open = mos7720_open, 1737 .close = mos7720_close, 1738 .throttle = mos7720_throttle, 1739 .unthrottle = mos7720_unthrottle, 1740 .attach = mos7720_startup, 1741 .release = mos7720_release, 1742 .port_probe = mos7720_port_probe, 1743 .port_remove = mos7720_port_remove, 1744 .ioctl = mos7720_ioctl, 1745 .tiocmget = mos7720_tiocmget, 1746 .tiocmset = mos7720_tiocmset, 1747 .set_termios = mos7720_set_termios, 1748 .write = mos7720_write, 1749 .write_room = mos7720_write_room, 1750 .chars_in_buffer = mos7720_chars_in_buffer, 1751 .break_ctl = mos7720_break, 1752 .read_bulk_callback = mos7720_bulk_in_callback, 1753 .read_int_callback = mos7720_interrupt_callback, 1754}; 1755 1756static struct usb_serial_driver * const serial_drivers[] = { 1757 &moschip7720_2port_driver, NULL 1758}; 1759 1760module_usb_serial_driver(serial_drivers, id_table); 1761 1762MODULE_AUTHOR(DRIVER_AUTHOR); 1763MODULE_DESCRIPTION(DRIVER_DESC); 1764MODULE_LICENSE("GPL v2"); 1765