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 */ 56 struct 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 69 static 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 }; 74 MODULE_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 82 enum 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 88 struct 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 */ 101 static DEFINE_SPINLOCK(release_lock); 102 103 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ 104 105 static const unsigned int dummy; /* for clarity in register access fns */ 106 107 enum 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 */ 134 static 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 */ 165 static 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 */ 183 static 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 */ 205 static 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 241 242 static 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 } 250 251 static 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 */ 271 static 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 */ 306 static 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 } 313 314 static 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); 330 done: 331 mutex_unlock(&mos_parport->serial->disc_mutex); 332 } 333 334 static 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 } 344 345 static 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 } 356 357 static 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 } 369 370 static 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 } 385 386 static 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 } 404 405 static 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 } 420 421 static void parport_mos7715_enable_irq(struct parport *pp) 422 { 423 } 424 425 static void parport_mos7715_disable_irq(struct parport *pp) 426 { 427 } 428 429 static 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 } 441 442 static 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 } 454 455 static 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 */ 463 static 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 */ 480 static 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 } 497 498 static 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 } 521 522 static 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 */ 553 static 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 */ 605 static 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 } 678 679 exit: 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 */ 690 static 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 753 754 exit: 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 */ 765 static 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 */ 800 static 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 } 819 820 static 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 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 } 841 842 static 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 */ 949 static 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 } 964 965 static 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 } 998 999 static void 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; 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 write_mos_reg(serial, port->port_number, MOS7720_LCR, 1019 mos7720_port->shadowLCR); 1020 } 1021 1022 /* 1023 * mos7720_write_room 1024 * this function is called by the tty driver when it wants to know how many 1025 * bytes of data we can accept for a specific port. 1026 */ 1027 static unsigned int mos7720_write_room(struct tty_struct *tty) 1028 { 1029 struct usb_serial_port *port = tty->driver_data; 1030 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1031 unsigned int room = 0; 1032 int i; 1033 1034 /* FIXME: Locking */ 1035 for (i = 0; i < NUM_URBS; ++i) { 1036 if (mos7720_port->write_urb_pool[i] && 1037 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1038 room += URB_TRANSFER_BUFFER_SIZE; 1039 } 1040 1041 dev_dbg(&port->dev, "%s - returns %u\n", __func__, room); 1042 return room; 1043 } 1044 1045 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1046 const unsigned char *data, int count) 1047 { 1048 int status; 1049 int i; 1050 int bytes_sent = 0; 1051 int transfer_size; 1052 1053 struct moschip_port *mos7720_port; 1054 struct usb_serial *serial; 1055 struct urb *urb; 1056 const unsigned char *current_position = data; 1057 1058 serial = port->serial; 1059 1060 mos7720_port = usb_get_serial_port_data(port); 1061 if (mos7720_port == NULL) 1062 return -ENODEV; 1063 1064 /* try to find a free urb in the list */ 1065 urb = NULL; 1066 1067 for (i = 0; i < NUM_URBS; ++i) { 1068 if (mos7720_port->write_urb_pool[i] && 1069 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1070 urb = mos7720_port->write_urb_pool[i]; 1071 dev_dbg(&port->dev, "URB:%d\n", i); 1072 break; 1073 } 1074 } 1075 1076 if (urb == NULL) { 1077 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1078 goto exit; 1079 } 1080 1081 if (urb->transfer_buffer == NULL) { 1082 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1083 GFP_ATOMIC); 1084 if (!urb->transfer_buffer) { 1085 bytes_sent = -ENOMEM; 1086 goto exit; 1087 } 1088 } 1089 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1090 1091 memcpy(urb->transfer_buffer, current_position, transfer_size); 1092 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1093 urb->transfer_buffer); 1094 1095 /* fill urb with data and submit */ 1096 usb_fill_bulk_urb(urb, serial->dev, 1097 usb_sndbulkpipe(serial->dev, 1098 port->bulk_out_endpointAddress), 1099 urb->transfer_buffer, transfer_size, 1100 mos7720_bulk_out_data_callback, mos7720_port); 1101 1102 /* send it down the pipe */ 1103 status = usb_submit_urb(urb, GFP_ATOMIC); 1104 if (status) { 1105 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1106 "with status = %d\n", __func__, status); 1107 bytes_sent = status; 1108 goto exit; 1109 } 1110 bytes_sent = transfer_size; 1111 1112 exit: 1113 return bytes_sent; 1114 } 1115 1116 static void mos7720_throttle(struct tty_struct *tty) 1117 { 1118 struct usb_serial_port *port = tty->driver_data; 1119 struct moschip_port *mos7720_port; 1120 int status; 1121 1122 mos7720_port = usb_get_serial_port_data(port); 1123 1124 if (mos7720_port == NULL) 1125 return; 1126 1127 if (!mos7720_port->open) { 1128 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1129 return; 1130 } 1131 1132 /* if we are implementing XON/XOFF, send the stop character */ 1133 if (I_IXOFF(tty)) { 1134 unsigned char stop_char = STOP_CHAR(tty); 1135 status = mos7720_write(tty, port, &stop_char, 1); 1136 if (status <= 0) 1137 return; 1138 } 1139 1140 /* if we are implementing RTS/CTS, toggle that line */ 1141 if (C_CRTSCTS(tty)) { 1142 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1143 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1144 mos7720_port->shadowMCR); 1145 } 1146 } 1147 1148 static void mos7720_unthrottle(struct tty_struct *tty) 1149 { 1150 struct usb_serial_port *port = tty->driver_data; 1151 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1152 int status; 1153 1154 if (mos7720_port == NULL) 1155 return; 1156 1157 if (!mos7720_port->open) { 1158 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1159 return; 1160 } 1161 1162 /* if we are implementing XON/XOFF, send the start character */ 1163 if (I_IXOFF(tty)) { 1164 unsigned char start_char = START_CHAR(tty); 1165 status = mos7720_write(tty, port, &start_char, 1); 1166 if (status <= 0) 1167 return; 1168 } 1169 1170 /* if we are implementing RTS/CTS, toggle that line */ 1171 if (C_CRTSCTS(tty)) { 1172 mos7720_port->shadowMCR |= UART_MCR_RTS; 1173 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1174 mos7720_port->shadowMCR); 1175 } 1176 } 1177 1178 /* FIXME: this function does not work */ 1179 static int set_higher_rates(struct moschip_port *mos7720_port, 1180 unsigned int baud) 1181 { 1182 struct usb_serial_port *port; 1183 struct usb_serial *serial; 1184 int port_number; 1185 enum mos_regs sp_reg; 1186 if (mos7720_port == NULL) 1187 return -EINVAL; 1188 1189 port = mos7720_port->port; 1190 serial = port->serial; 1191 1192 /*********************************************** 1193 * Init Sequence for higher rates 1194 ***********************************************/ 1195 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1196 port_number = port->port_number; 1197 1198 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1199 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1200 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1201 mos7720_port->shadowMCR = 0x0b; 1202 write_mos_reg(serial, port_number, MOS7720_MCR, 1203 mos7720_port->shadowMCR); 1204 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1205 1206 /*********************************************** 1207 * Set for higher rates * 1208 ***********************************************/ 1209 /* writing baud rate verbatum into uart clock field clearly not right */ 1210 if (port_number == 0) 1211 sp_reg = MOS7720_SP1_REG; 1212 else 1213 sp_reg = MOS7720_SP2_REG; 1214 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1215 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1216 mos7720_port->shadowMCR = 0x2b; 1217 write_mos_reg(serial, port_number, MOS7720_MCR, 1218 mos7720_port->shadowMCR); 1219 1220 /*********************************************** 1221 * Set DLL/DLM 1222 ***********************************************/ 1223 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1224 write_mos_reg(serial, port_number, MOS7720_LCR, 1225 mos7720_port->shadowLCR); 1226 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1227 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1228 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1229 write_mos_reg(serial, port_number, MOS7720_LCR, 1230 mos7720_port->shadowLCR); 1231 1232 return 0; 1233 } 1234 1235 /* baud rate information */ 1236 struct divisor_table_entry { 1237 __u32 baudrate; 1238 __u16 divisor; 1239 }; 1240 1241 /* Define table of divisors for moschip 7720 hardware * 1242 * These assume a 3.6864MHz crystal, the standard /16, and * 1243 * MCR.7 = 0. */ 1244 static const struct divisor_table_entry divisor_table[] = { 1245 { 50, 2304}, 1246 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1247 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1248 { 150, 768}, 1249 { 300, 384}, 1250 { 600, 192}, 1251 { 1200, 96}, 1252 { 1800, 64}, 1253 { 2400, 48}, 1254 { 4800, 24}, 1255 { 7200, 16}, 1256 { 9600, 12}, 1257 { 19200, 6}, 1258 { 38400, 3}, 1259 { 57600, 2}, 1260 { 115200, 1}, 1261 }; 1262 1263 /***************************************************************************** 1264 * calc_baud_rate_divisor 1265 * this function calculates the proper baud rate divisor for the specified 1266 * baud rate. 1267 *****************************************************************************/ 1268 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1269 { 1270 int i; 1271 __u16 custom; 1272 __u16 round1; 1273 __u16 round; 1274 1275 1276 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1277 1278 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1279 if (divisor_table[i].baudrate == baudrate) { 1280 *divisor = divisor_table[i].divisor; 1281 return 0; 1282 } 1283 } 1284 1285 /* After trying for all the standard baud rates * 1286 * Try calculating the divisor for this baud rate */ 1287 if (baudrate > 75 && baudrate < 230400) { 1288 /* get the divisor */ 1289 custom = (__u16)(230400L / baudrate); 1290 1291 /* Check for round off */ 1292 round1 = (__u16)(2304000L / baudrate); 1293 round = (__u16)(round1 - (custom * 10)); 1294 if (round > 4) 1295 custom++; 1296 *divisor = custom; 1297 1298 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1299 return 0; 1300 } 1301 1302 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1303 return -EINVAL; 1304 } 1305 1306 /* 1307 * send_cmd_write_baud_rate 1308 * this function sends the proper command to change the baud rate of the 1309 * specified port. 1310 */ 1311 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1312 int baudrate) 1313 { 1314 struct usb_serial_port *port; 1315 struct usb_serial *serial; 1316 int divisor; 1317 int status; 1318 unsigned char number; 1319 1320 if (mos7720_port == NULL) 1321 return -1; 1322 1323 port = mos7720_port->port; 1324 serial = port->serial; 1325 1326 number = port->port_number; 1327 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1328 1329 /* Calculate the Divisor */ 1330 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1331 if (status) { 1332 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1333 return status; 1334 } 1335 1336 /* Enable access to divisor latch */ 1337 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1338 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1339 1340 /* Write the divisor */ 1341 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1342 write_mos_reg(serial, number, MOS7720_DLM, 1343 (__u8)((divisor & 0xff00) >> 8)); 1344 1345 /* Disable access to divisor latch */ 1346 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1347 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1348 1349 return status; 1350 } 1351 1352 /* 1353 * change_port_settings 1354 * This routine is called to set the UART on the device to match 1355 * the specified new settings. 1356 */ 1357 static void change_port_settings(struct tty_struct *tty, 1358 struct moschip_port *mos7720_port, 1359 struct ktermios *old_termios) 1360 { 1361 struct usb_serial_port *port; 1362 struct usb_serial *serial; 1363 int baud; 1364 unsigned cflag; 1365 __u8 lData; 1366 __u8 lParity; 1367 __u8 lStop; 1368 int status; 1369 int port_number; 1370 1371 if (mos7720_port == NULL) 1372 return ; 1373 1374 port = mos7720_port->port; 1375 serial = port->serial; 1376 port_number = port->port_number; 1377 1378 if (!mos7720_port->open) { 1379 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1380 return; 1381 } 1382 1383 lData = UART_LCR_WLEN8; 1384 lStop = 0x00; /* 1 stop bit */ 1385 lParity = 0x00; /* No parity */ 1386 1387 cflag = tty->termios.c_cflag; 1388 1389 /* Change the number of bits */ 1390 switch (cflag & CSIZE) { 1391 case CS5: 1392 lData = UART_LCR_WLEN5; 1393 break; 1394 1395 case CS6: 1396 lData = UART_LCR_WLEN6; 1397 break; 1398 1399 case CS7: 1400 lData = UART_LCR_WLEN7; 1401 break; 1402 default: 1403 case CS8: 1404 lData = UART_LCR_WLEN8; 1405 break; 1406 } 1407 1408 /* Change the Parity bit */ 1409 if (cflag & PARENB) { 1410 if (cflag & PARODD) { 1411 lParity = UART_LCR_PARITY; 1412 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1413 } else { 1414 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1415 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1416 } 1417 1418 } else { 1419 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1420 } 1421 1422 if (cflag & CMSPAR) 1423 lParity = lParity | 0x20; 1424 1425 /* Change the Stop bit */ 1426 if (cflag & CSTOPB) { 1427 lStop = UART_LCR_STOP; 1428 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1429 } else { 1430 lStop = 0x00; 1431 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1432 } 1433 1434 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1435 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1436 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1437 1438 /* Update the LCR with the correct value */ 1439 mos7720_port->shadowLCR &= 1440 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1441 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1442 1443 1444 /* Disable Interrupts */ 1445 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1446 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1447 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1448 1449 /* Send the updated LCR value to the mos7720 */ 1450 write_mos_reg(serial, port_number, MOS7720_LCR, 1451 mos7720_port->shadowLCR); 1452 mos7720_port->shadowMCR = 0x0b; 1453 write_mos_reg(serial, port_number, MOS7720_MCR, 1454 mos7720_port->shadowMCR); 1455 1456 /* set up the MCR register and send it to the mos7720 */ 1457 mos7720_port->shadowMCR = UART_MCR_OUT2; 1458 if (cflag & CBAUD) 1459 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1460 1461 if (cflag & CRTSCTS) { 1462 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1463 /* To set hardware flow control to the specified * 1464 * serial port, in SP1/2_CONTROL_REG */ 1465 if (port_number) 1466 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1467 0x01); 1468 else 1469 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1470 0x02); 1471 1472 } else 1473 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1474 1475 write_mos_reg(serial, port_number, MOS7720_MCR, 1476 mos7720_port->shadowMCR); 1477 1478 /* Determine divisor based on baud rate */ 1479 baud = tty_get_baud_rate(tty); 1480 if (!baud) { 1481 /* pick a default, any default... */ 1482 dev_dbg(&port->dev, "Picked default baud...\n"); 1483 baud = 9600; 1484 } 1485 1486 if (baud >= 230400) { 1487 set_higher_rates(mos7720_port, baud); 1488 /* Enable Interrupts */ 1489 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1490 return; 1491 } 1492 1493 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1494 status = send_cmd_write_baud_rate(mos7720_port, baud); 1495 /* FIXME: needs to write actual resulting baud back not just 1496 blindly do so */ 1497 if (cflag & CBAUD) 1498 tty_encode_baud_rate(tty, baud, baud); 1499 /* Enable Interrupts */ 1500 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1501 1502 if (port->read_urb->status != -EINPROGRESS) { 1503 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1504 if (status) 1505 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1506 } 1507 } 1508 1509 /* 1510 * mos7720_set_termios 1511 * this function is called by the tty driver when it wants to change the 1512 * termios structure. 1513 */ 1514 static void mos7720_set_termios(struct tty_struct *tty, 1515 struct usb_serial_port *port, struct ktermios *old_termios) 1516 { 1517 int status; 1518 struct moschip_port *mos7720_port; 1519 1520 mos7720_port = usb_get_serial_port_data(port); 1521 1522 if (mos7720_port == NULL) 1523 return; 1524 1525 if (!mos7720_port->open) { 1526 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1527 return; 1528 } 1529 1530 /* change the port settings to the new ones specified */ 1531 change_port_settings(tty, mos7720_port, old_termios); 1532 1533 if (port->read_urb->status != -EINPROGRESS) { 1534 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1535 if (status) 1536 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1537 } 1538 } 1539 1540 /* 1541 * get_lsr_info - get line status register info 1542 * 1543 * Purpose: Let user call ioctl() to get info when the UART physically 1544 * is emptied. On bus types like RS485, the transmitter must 1545 * release the bus after transmitting. This must be done when 1546 * the transmit shift register is empty, not be done when the 1547 * transmit holding register is empty. This functionality 1548 * allows an RS485 driver to be written in user space. 1549 */ 1550 static int get_lsr_info(struct tty_struct *tty, 1551 struct moschip_port *mos7720_port, unsigned int __user *value) 1552 { 1553 struct usb_serial_port *port = tty->driver_data; 1554 unsigned int result = 0; 1555 unsigned char data = 0; 1556 int port_number = port->port_number; 1557 int count; 1558 1559 count = mos7720_chars_in_buffer(tty); 1560 if (count == 0) { 1561 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1562 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1563 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1564 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1565 result = TIOCSER_TEMT; 1566 } 1567 } 1568 if (copy_to_user(value, &result, sizeof(int))) 1569 return -EFAULT; 1570 return 0; 1571 } 1572 1573 static int mos7720_tiocmget(struct tty_struct *tty) 1574 { 1575 struct usb_serial_port *port = tty->driver_data; 1576 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1577 unsigned int result = 0; 1578 unsigned int mcr ; 1579 unsigned int msr ; 1580 1581 mcr = mos7720_port->shadowMCR; 1582 msr = mos7720_port->shadowMSR; 1583 1584 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1585 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1586 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1587 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1588 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1589 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1590 1591 return result; 1592 } 1593 1594 static int mos7720_tiocmset(struct tty_struct *tty, 1595 unsigned int set, unsigned int clear) 1596 { 1597 struct usb_serial_port *port = tty->driver_data; 1598 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1599 unsigned int mcr ; 1600 1601 mcr = mos7720_port->shadowMCR; 1602 1603 if (set & TIOCM_RTS) 1604 mcr |= UART_MCR_RTS; 1605 if (set & TIOCM_DTR) 1606 mcr |= UART_MCR_DTR; 1607 if (set & TIOCM_LOOP) 1608 mcr |= UART_MCR_LOOP; 1609 1610 if (clear & TIOCM_RTS) 1611 mcr &= ~UART_MCR_RTS; 1612 if (clear & TIOCM_DTR) 1613 mcr &= ~UART_MCR_DTR; 1614 if (clear & TIOCM_LOOP) 1615 mcr &= ~UART_MCR_LOOP; 1616 1617 mos7720_port->shadowMCR = mcr; 1618 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1619 mos7720_port->shadowMCR); 1620 1621 return 0; 1622 } 1623 1624 static int mos7720_ioctl(struct tty_struct *tty, 1625 unsigned int cmd, unsigned long arg) 1626 { 1627 struct usb_serial_port *port = tty->driver_data; 1628 struct moschip_port *mos7720_port; 1629 1630 mos7720_port = usb_get_serial_port_data(port); 1631 if (mos7720_port == NULL) 1632 return -ENODEV; 1633 1634 switch (cmd) { 1635 case TIOCSERGETLSR: 1636 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1637 return get_lsr_info(tty, mos7720_port, 1638 (unsigned int __user *)arg); 1639 } 1640 1641 return -ENOIOCTLCMD; 1642 } 1643 1644 static int mos7720_startup(struct usb_serial *serial) 1645 { 1646 struct usb_device *dev; 1647 char data; 1648 u16 product; 1649 int ret_val; 1650 1651 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1652 dev = serial->dev; 1653 1654 if (product == MOSCHIP_DEVICE_ID_7715) { 1655 struct urb *urb = serial->port[0]->interrupt_in_urb; 1656 1657 urb->complete = mos7715_interrupt_callback; 1658 1659 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1660 ret_val = mos7715_parport_init(serial); 1661 if (ret_val < 0) 1662 return ret_val; 1663 #endif 1664 } 1665 /* start the interrupt urb */ 1666 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1667 if (ret_val) { 1668 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", 1669 ret_val); 1670 } 1671 1672 /* LSR For Port 1 */ 1673 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1674 dev_dbg(&dev->dev, "LSR:%x\n", data); 1675 1676 return 0; 1677 } 1678 1679 static void mos7720_release(struct usb_serial *serial) 1680 { 1681 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1682 1683 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1684 /* close the parallel port */ 1685 1686 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1687 == MOSCHIP_DEVICE_ID_7715) { 1688 struct mos7715_parport *mos_parport = 1689 usb_get_serial_data(serial); 1690 1691 /* prevent NULL ptr dereference in port callbacks */ 1692 spin_lock(&release_lock); 1693 mos_parport->pp->private_data = NULL; 1694 spin_unlock(&release_lock); 1695 1696 /* wait for synchronous usb calls to return */ 1697 if (mos_parport->msg_pending) 1698 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1699 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1700 /* 1701 * If delayed work is currently scheduled, wait for it to 1702 * complete. This also implies barriers that ensure the 1703 * below serial clearing is not hoisted above the ->work. 1704 */ 1705 cancel_work_sync(&mos_parport->work); 1706 1707 parport_remove_port(mos_parport->pp); 1708 usb_set_serial_data(serial, NULL); 1709 mos_parport->serial = NULL; 1710 1711 parport_del_port(mos_parport->pp); 1712 1713 kref_put(&mos_parport->ref_count, destroy_mos_parport); 1714 } 1715 #endif 1716 } 1717 1718 static int mos7720_port_probe(struct usb_serial_port *port) 1719 { 1720 struct moschip_port *mos7720_port; 1721 1722 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 1723 if (!mos7720_port) 1724 return -ENOMEM; 1725 1726 mos7720_port->port = port; 1727 1728 usb_set_serial_port_data(port, mos7720_port); 1729 1730 return 0; 1731 } 1732 1733 static void mos7720_port_remove(struct usb_serial_port *port) 1734 { 1735 struct moschip_port *mos7720_port; 1736 1737 mos7720_port = usb_get_serial_port_data(port); 1738 kfree(mos7720_port); 1739 } 1740 1741 static struct usb_serial_driver moschip7720_2port_driver = { 1742 .driver = { 1743 .owner = THIS_MODULE, 1744 .name = "moschip7720", 1745 }, 1746 .description = "Moschip 2 port adapter", 1747 .id_table = id_table, 1748 .num_bulk_in = 2, 1749 .num_bulk_out = 2, 1750 .num_interrupt_in = 1, 1751 .calc_num_ports = mos77xx_calc_num_ports, 1752 .open = mos7720_open, 1753 .close = mos7720_close, 1754 .throttle = mos7720_throttle, 1755 .unthrottle = mos7720_unthrottle, 1756 .attach = mos7720_startup, 1757 .release = mos7720_release, 1758 .port_probe = mos7720_port_probe, 1759 .port_remove = mos7720_port_remove, 1760 .ioctl = mos7720_ioctl, 1761 .tiocmget = mos7720_tiocmget, 1762 .tiocmset = mos7720_tiocmset, 1763 .set_termios = mos7720_set_termios, 1764 .write = mos7720_write, 1765 .write_room = mos7720_write_room, 1766 .chars_in_buffer = mos7720_chars_in_buffer, 1767 .break_ctl = mos7720_break, 1768 .read_bulk_callback = mos7720_bulk_in_callback, 1769 .read_int_callback = mos7720_interrupt_callback, 1770 }; 1771 1772 static struct usb_serial_driver * const serial_drivers[] = { 1773 &moschip7720_2port_driver, NULL 1774 }; 1775 1776 module_usb_serial_driver(serial_drivers, id_table); 1777 1778 MODULE_AUTHOR(DRIVER_AUTHOR); 1779 MODULE_DESCRIPTION(DRIVER_DESC); 1780 MODULE_LICENSE("GPL v2"); 1781