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 * If successful, we return the number of bytes left to be written in the 949 * system, 950 * Otherwise we return a negative error number. 951 */ 952 static int mos7720_chars_in_buffer(struct tty_struct *tty) 953 { 954 struct usb_serial_port *port = tty->driver_data; 955 int i; 956 int chars = 0; 957 struct moschip_port *mos7720_port; 958 959 mos7720_port = usb_get_serial_port_data(port); 960 if (mos7720_port == NULL) 961 return 0; 962 963 for (i = 0; i < NUM_URBS; ++i) { 964 if (mos7720_port->write_urb_pool[i] && 965 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) 966 chars += URB_TRANSFER_BUFFER_SIZE; 967 } 968 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 969 return chars; 970 } 971 972 static void mos7720_close(struct usb_serial_port *port) 973 { 974 struct usb_serial *serial; 975 struct moschip_port *mos7720_port; 976 int j; 977 978 serial = port->serial; 979 980 mos7720_port = usb_get_serial_port_data(port); 981 if (mos7720_port == NULL) 982 return; 983 984 for (j = 0; j < NUM_URBS; ++j) 985 usb_kill_urb(mos7720_port->write_urb_pool[j]); 986 987 /* Freeing Write URBs */ 988 for (j = 0; j < NUM_URBS; ++j) { 989 if (mos7720_port->write_urb_pool[j]) { 990 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); 991 usb_free_urb(mos7720_port->write_urb_pool[j]); 992 } 993 } 994 995 /* While closing port, shutdown all bulk read, write * 996 * and interrupt read if they exists, otherwise nop */ 997 usb_kill_urb(port->write_urb); 998 usb_kill_urb(port->read_urb); 999 1000 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); 1001 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); 1002 1003 mos7720_port->open = 0; 1004 } 1005 1006 static void mos7720_break(struct tty_struct *tty, int break_state) 1007 { 1008 struct usb_serial_port *port = tty->driver_data; 1009 unsigned char data; 1010 struct usb_serial *serial; 1011 struct moschip_port *mos7720_port; 1012 1013 serial = port->serial; 1014 1015 mos7720_port = usb_get_serial_port_data(port); 1016 if (mos7720_port == NULL) 1017 return; 1018 1019 if (break_state == -1) 1020 data = mos7720_port->shadowLCR | UART_LCR_SBC; 1021 else 1022 data = mos7720_port->shadowLCR & ~UART_LCR_SBC; 1023 1024 mos7720_port->shadowLCR = data; 1025 write_mos_reg(serial, port->port_number, MOS7720_LCR, 1026 mos7720_port->shadowLCR); 1027 } 1028 1029 /* 1030 * mos7720_write_room 1031 * this function is called by the tty driver when it wants to know how many 1032 * bytes of data we can accept for a specific port. 1033 * If successful, we return the amount of room that we have for this port 1034 * Otherwise we return a negative error number. 1035 */ 1036 static int mos7720_write_room(struct tty_struct *tty) 1037 { 1038 struct usb_serial_port *port = tty->driver_data; 1039 struct moschip_port *mos7720_port; 1040 int room = 0; 1041 int i; 1042 1043 mos7720_port = usb_get_serial_port_data(port); 1044 if (mos7720_port == NULL) 1045 return -ENODEV; 1046 1047 /* FIXME: Locking */ 1048 for (i = 0; i < NUM_URBS; ++i) { 1049 if (mos7720_port->write_urb_pool[i] && 1050 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) 1051 room += URB_TRANSFER_BUFFER_SIZE; 1052 } 1053 1054 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 1055 return room; 1056 } 1057 1058 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, 1059 const unsigned char *data, int count) 1060 { 1061 int status; 1062 int i; 1063 int bytes_sent = 0; 1064 int transfer_size; 1065 1066 struct moschip_port *mos7720_port; 1067 struct usb_serial *serial; 1068 struct urb *urb; 1069 const unsigned char *current_position = data; 1070 1071 serial = port->serial; 1072 1073 mos7720_port = usb_get_serial_port_data(port); 1074 if (mos7720_port == NULL) 1075 return -ENODEV; 1076 1077 /* try to find a free urb in the list */ 1078 urb = NULL; 1079 1080 for (i = 0; i < NUM_URBS; ++i) { 1081 if (mos7720_port->write_urb_pool[i] && 1082 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { 1083 urb = mos7720_port->write_urb_pool[i]; 1084 dev_dbg(&port->dev, "URB:%d\n", i); 1085 break; 1086 } 1087 } 1088 1089 if (urb == NULL) { 1090 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1091 goto exit; 1092 } 1093 1094 if (urb->transfer_buffer == NULL) { 1095 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1096 GFP_ATOMIC); 1097 if (!urb->transfer_buffer) { 1098 bytes_sent = -ENOMEM; 1099 goto exit; 1100 } 1101 } 1102 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1103 1104 memcpy(urb->transfer_buffer, current_position, transfer_size); 1105 usb_serial_debug_data(&port->dev, __func__, transfer_size, 1106 urb->transfer_buffer); 1107 1108 /* fill urb with data and submit */ 1109 usb_fill_bulk_urb(urb, serial->dev, 1110 usb_sndbulkpipe(serial->dev, 1111 port->bulk_out_endpointAddress), 1112 urb->transfer_buffer, transfer_size, 1113 mos7720_bulk_out_data_callback, mos7720_port); 1114 1115 /* send it down the pipe */ 1116 status = usb_submit_urb(urb, GFP_ATOMIC); 1117 if (status) { 1118 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1119 "with status = %d\n", __func__, status); 1120 bytes_sent = status; 1121 goto exit; 1122 } 1123 bytes_sent = transfer_size; 1124 1125 exit: 1126 return bytes_sent; 1127 } 1128 1129 static void mos7720_throttle(struct tty_struct *tty) 1130 { 1131 struct usb_serial_port *port = tty->driver_data; 1132 struct moschip_port *mos7720_port; 1133 int status; 1134 1135 mos7720_port = usb_get_serial_port_data(port); 1136 1137 if (mos7720_port == NULL) 1138 return; 1139 1140 if (!mos7720_port->open) { 1141 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1142 return; 1143 } 1144 1145 /* if we are implementing XON/XOFF, send the stop character */ 1146 if (I_IXOFF(tty)) { 1147 unsigned char stop_char = STOP_CHAR(tty); 1148 status = mos7720_write(tty, port, &stop_char, 1); 1149 if (status <= 0) 1150 return; 1151 } 1152 1153 /* if we are implementing RTS/CTS, toggle that line */ 1154 if (C_CRTSCTS(tty)) { 1155 mos7720_port->shadowMCR &= ~UART_MCR_RTS; 1156 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1157 mos7720_port->shadowMCR); 1158 } 1159 } 1160 1161 static void mos7720_unthrottle(struct tty_struct *tty) 1162 { 1163 struct usb_serial_port *port = tty->driver_data; 1164 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1165 int status; 1166 1167 if (mos7720_port == NULL) 1168 return; 1169 1170 if (!mos7720_port->open) { 1171 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1172 return; 1173 } 1174 1175 /* if we are implementing XON/XOFF, send the start character */ 1176 if (I_IXOFF(tty)) { 1177 unsigned char start_char = START_CHAR(tty); 1178 status = mos7720_write(tty, port, &start_char, 1); 1179 if (status <= 0) 1180 return; 1181 } 1182 1183 /* if we are implementing RTS/CTS, toggle that line */ 1184 if (C_CRTSCTS(tty)) { 1185 mos7720_port->shadowMCR |= UART_MCR_RTS; 1186 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1187 mos7720_port->shadowMCR); 1188 } 1189 } 1190 1191 /* FIXME: this function does not work */ 1192 static int set_higher_rates(struct moschip_port *mos7720_port, 1193 unsigned int baud) 1194 { 1195 struct usb_serial_port *port; 1196 struct usb_serial *serial; 1197 int port_number; 1198 enum mos_regs sp_reg; 1199 if (mos7720_port == NULL) 1200 return -EINVAL; 1201 1202 port = mos7720_port->port; 1203 serial = port->serial; 1204 1205 /*********************************************** 1206 * Init Sequence for higher rates 1207 ***********************************************/ 1208 dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); 1209 port_number = port->port_number; 1210 1211 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1212 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1213 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1214 mos7720_port->shadowMCR = 0x0b; 1215 write_mos_reg(serial, port_number, MOS7720_MCR, 1216 mos7720_port->shadowMCR); 1217 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); 1218 1219 /*********************************************** 1220 * Set for higher rates * 1221 ***********************************************/ 1222 /* writing baud rate verbatum into uart clock field clearly not right */ 1223 if (port_number == 0) 1224 sp_reg = MOS7720_SP1_REG; 1225 else 1226 sp_reg = MOS7720_SP2_REG; 1227 write_mos_reg(serial, dummy, sp_reg, baud * 0x10); 1228 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); 1229 mos7720_port->shadowMCR = 0x2b; 1230 write_mos_reg(serial, port_number, MOS7720_MCR, 1231 mos7720_port->shadowMCR); 1232 1233 /*********************************************** 1234 * Set DLL/DLM 1235 ***********************************************/ 1236 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1237 write_mos_reg(serial, port_number, MOS7720_LCR, 1238 mos7720_port->shadowLCR); 1239 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); 1240 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); 1241 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1242 write_mos_reg(serial, port_number, MOS7720_LCR, 1243 mos7720_port->shadowLCR); 1244 1245 return 0; 1246 } 1247 1248 /* baud rate information */ 1249 struct divisor_table_entry { 1250 __u32 baudrate; 1251 __u16 divisor; 1252 }; 1253 1254 /* Define table of divisors for moschip 7720 hardware * 1255 * These assume a 3.6864MHz crystal, the standard /16, and * 1256 * MCR.7 = 0. */ 1257 static const struct divisor_table_entry divisor_table[] = { 1258 { 50, 2304}, 1259 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ 1260 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ 1261 { 150, 768}, 1262 { 300, 384}, 1263 { 600, 192}, 1264 { 1200, 96}, 1265 { 1800, 64}, 1266 { 2400, 48}, 1267 { 4800, 24}, 1268 { 7200, 16}, 1269 { 9600, 12}, 1270 { 19200, 6}, 1271 { 38400, 3}, 1272 { 57600, 2}, 1273 { 115200, 1}, 1274 }; 1275 1276 /***************************************************************************** 1277 * calc_baud_rate_divisor 1278 * this function calculates the proper baud rate divisor for the specified 1279 * baud rate. 1280 *****************************************************************************/ 1281 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) 1282 { 1283 int i; 1284 __u16 custom; 1285 __u16 round1; 1286 __u16 round; 1287 1288 1289 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); 1290 1291 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { 1292 if (divisor_table[i].baudrate == baudrate) { 1293 *divisor = divisor_table[i].divisor; 1294 return 0; 1295 } 1296 } 1297 1298 /* After trying for all the standard baud rates * 1299 * Try calculating the divisor for this baud rate */ 1300 if (baudrate > 75 && baudrate < 230400) { 1301 /* get the divisor */ 1302 custom = (__u16)(230400L / baudrate); 1303 1304 /* Check for round off */ 1305 round1 = (__u16)(2304000L / baudrate); 1306 round = (__u16)(round1 - (custom * 10)); 1307 if (round > 4) 1308 custom++; 1309 *divisor = custom; 1310 1311 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); 1312 return 0; 1313 } 1314 1315 dev_dbg(&port->dev, "Baud calculation Failed...\n"); 1316 return -EINVAL; 1317 } 1318 1319 /* 1320 * send_cmd_write_baud_rate 1321 * this function sends the proper command to change the baud rate of the 1322 * specified port. 1323 */ 1324 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 1325 int baudrate) 1326 { 1327 struct usb_serial_port *port; 1328 struct usb_serial *serial; 1329 int divisor; 1330 int status; 1331 unsigned char number; 1332 1333 if (mos7720_port == NULL) 1334 return -1; 1335 1336 port = mos7720_port->port; 1337 serial = port->serial; 1338 1339 number = port->port_number; 1340 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); 1341 1342 /* Calculate the Divisor */ 1343 status = calc_baud_rate_divisor(port, baudrate, &divisor); 1344 if (status) { 1345 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1346 return status; 1347 } 1348 1349 /* Enable access to divisor latch */ 1350 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; 1351 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1352 1353 /* Write the divisor */ 1354 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); 1355 write_mos_reg(serial, number, MOS7720_DLM, 1356 (__u8)((divisor & 0xff00) >> 8)); 1357 1358 /* Disable access to divisor latch */ 1359 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; 1360 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); 1361 1362 return status; 1363 } 1364 1365 /* 1366 * change_port_settings 1367 * This routine is called to set the UART on the device to match 1368 * the specified new settings. 1369 */ 1370 static void change_port_settings(struct tty_struct *tty, 1371 struct moschip_port *mos7720_port, 1372 struct ktermios *old_termios) 1373 { 1374 struct usb_serial_port *port; 1375 struct usb_serial *serial; 1376 int baud; 1377 unsigned cflag; 1378 __u8 lData; 1379 __u8 lParity; 1380 __u8 lStop; 1381 int status; 1382 int port_number; 1383 1384 if (mos7720_port == NULL) 1385 return ; 1386 1387 port = mos7720_port->port; 1388 serial = port->serial; 1389 port_number = port->port_number; 1390 1391 if (!mos7720_port->open) { 1392 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1393 return; 1394 } 1395 1396 lData = UART_LCR_WLEN8; 1397 lStop = 0x00; /* 1 stop bit */ 1398 lParity = 0x00; /* No parity */ 1399 1400 cflag = tty->termios.c_cflag; 1401 1402 /* Change the number of bits */ 1403 switch (cflag & CSIZE) { 1404 case CS5: 1405 lData = UART_LCR_WLEN5; 1406 break; 1407 1408 case CS6: 1409 lData = UART_LCR_WLEN6; 1410 break; 1411 1412 case CS7: 1413 lData = UART_LCR_WLEN7; 1414 break; 1415 default: 1416 case CS8: 1417 lData = UART_LCR_WLEN8; 1418 break; 1419 } 1420 1421 /* Change the Parity bit */ 1422 if (cflag & PARENB) { 1423 if (cflag & PARODD) { 1424 lParity = UART_LCR_PARITY; 1425 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1426 } else { 1427 lParity = (UART_LCR_EPAR | UART_LCR_PARITY); 1428 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1429 } 1430 1431 } else { 1432 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1433 } 1434 1435 if (cflag & CMSPAR) 1436 lParity = lParity | 0x20; 1437 1438 /* Change the Stop bit */ 1439 if (cflag & CSTOPB) { 1440 lStop = UART_LCR_STOP; 1441 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1442 } else { 1443 lStop = 0x00; 1444 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1445 } 1446 1447 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 1448 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 1449 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 1450 1451 /* Update the LCR with the correct value */ 1452 mos7720_port->shadowLCR &= 1453 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1454 mos7720_port->shadowLCR |= (lData | lParity | lStop); 1455 1456 1457 /* Disable Interrupts */ 1458 write_mos_reg(serial, port_number, MOS7720_IER, 0x00); 1459 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); 1460 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); 1461 1462 /* Send the updated LCR value to the mos7720 */ 1463 write_mos_reg(serial, port_number, MOS7720_LCR, 1464 mos7720_port->shadowLCR); 1465 mos7720_port->shadowMCR = 0x0b; 1466 write_mos_reg(serial, port_number, MOS7720_MCR, 1467 mos7720_port->shadowMCR); 1468 1469 /* set up the MCR register and send it to the mos7720 */ 1470 mos7720_port->shadowMCR = UART_MCR_OUT2; 1471 if (cflag & CBAUD) 1472 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); 1473 1474 if (cflag & CRTSCTS) { 1475 mos7720_port->shadowMCR |= (UART_MCR_XONANY); 1476 /* To set hardware flow control to the specified * 1477 * serial port, in SP1/2_CONTROL_REG */ 1478 if (port_number) 1479 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1480 0x01); 1481 else 1482 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 1483 0x02); 1484 1485 } else 1486 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); 1487 1488 write_mos_reg(serial, port_number, MOS7720_MCR, 1489 mos7720_port->shadowMCR); 1490 1491 /* Determine divisor based on baud rate */ 1492 baud = tty_get_baud_rate(tty); 1493 if (!baud) { 1494 /* pick a default, any default... */ 1495 dev_dbg(&port->dev, "Picked default baud...\n"); 1496 baud = 9600; 1497 } 1498 1499 if (baud >= 230400) { 1500 set_higher_rates(mos7720_port, baud); 1501 /* Enable Interrupts */ 1502 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1503 return; 1504 } 1505 1506 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1507 status = send_cmd_write_baud_rate(mos7720_port, baud); 1508 /* FIXME: needs to write actual resulting baud back not just 1509 blindly do so */ 1510 if (cflag & CBAUD) 1511 tty_encode_baud_rate(tty, baud, baud); 1512 /* Enable Interrupts */ 1513 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); 1514 1515 if (port->read_urb->status != -EINPROGRESS) { 1516 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1517 if (status) 1518 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1519 } 1520 } 1521 1522 /* 1523 * mos7720_set_termios 1524 * this function is called by the tty driver when it wants to change the 1525 * termios structure. 1526 */ 1527 static void mos7720_set_termios(struct tty_struct *tty, 1528 struct usb_serial_port *port, struct ktermios *old_termios) 1529 { 1530 int status; 1531 struct moschip_port *mos7720_port; 1532 1533 mos7720_port = usb_get_serial_port_data(port); 1534 1535 if (mos7720_port == NULL) 1536 return; 1537 1538 if (!mos7720_port->open) { 1539 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1540 return; 1541 } 1542 1543 /* change the port settings to the new ones specified */ 1544 change_port_settings(tty, mos7720_port, old_termios); 1545 1546 if (port->read_urb->status != -EINPROGRESS) { 1547 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1548 if (status) 1549 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); 1550 } 1551 } 1552 1553 /* 1554 * get_lsr_info - get line status register info 1555 * 1556 * Purpose: Let user call ioctl() to get info when the UART physically 1557 * is emptied. On bus types like RS485, the transmitter must 1558 * release the bus after transmitting. This must be done when 1559 * the transmit shift register is empty, not be done when the 1560 * transmit holding register is empty. This functionality 1561 * allows an RS485 driver to be written in user space. 1562 */ 1563 static int get_lsr_info(struct tty_struct *tty, 1564 struct moschip_port *mos7720_port, unsigned int __user *value) 1565 { 1566 struct usb_serial_port *port = tty->driver_data; 1567 unsigned int result = 0; 1568 unsigned char data = 0; 1569 int port_number = port->port_number; 1570 int count; 1571 1572 count = mos7720_chars_in_buffer(tty); 1573 if (count == 0) { 1574 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); 1575 if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) 1576 == (UART_LSR_TEMT | UART_LSR_THRE)) { 1577 dev_dbg(&port->dev, "%s -- Empty\n", __func__); 1578 result = TIOCSER_TEMT; 1579 } 1580 } 1581 if (copy_to_user(value, &result, sizeof(int))) 1582 return -EFAULT; 1583 return 0; 1584 } 1585 1586 static int mos7720_tiocmget(struct tty_struct *tty) 1587 { 1588 struct usb_serial_port *port = tty->driver_data; 1589 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1590 unsigned int result = 0; 1591 unsigned int mcr ; 1592 unsigned int msr ; 1593 1594 mcr = mos7720_port->shadowMCR; 1595 msr = mos7720_port->shadowMSR; 1596 1597 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 1598 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 1599 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 1600 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ 1601 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 1602 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 1603 1604 return result; 1605 } 1606 1607 static int mos7720_tiocmset(struct tty_struct *tty, 1608 unsigned int set, unsigned int clear) 1609 { 1610 struct usb_serial_port *port = tty->driver_data; 1611 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1612 unsigned int mcr ; 1613 1614 mcr = mos7720_port->shadowMCR; 1615 1616 if (set & TIOCM_RTS) 1617 mcr |= UART_MCR_RTS; 1618 if (set & TIOCM_DTR) 1619 mcr |= UART_MCR_DTR; 1620 if (set & TIOCM_LOOP) 1621 mcr |= UART_MCR_LOOP; 1622 1623 if (clear & TIOCM_RTS) 1624 mcr &= ~UART_MCR_RTS; 1625 if (clear & TIOCM_DTR) 1626 mcr &= ~UART_MCR_DTR; 1627 if (clear & TIOCM_LOOP) 1628 mcr &= ~UART_MCR_LOOP; 1629 1630 mos7720_port->shadowMCR = mcr; 1631 write_mos_reg(port->serial, port->port_number, MOS7720_MCR, 1632 mos7720_port->shadowMCR); 1633 1634 return 0; 1635 } 1636 1637 static int get_serial_info(struct tty_struct *tty, 1638 struct serial_struct *ss) 1639 { 1640 struct usb_serial_port *port = tty->driver_data; 1641 struct moschip_port *mos7720_port = usb_get_serial_port_data(port); 1642 1643 ss->type = PORT_16550A; 1644 ss->line = mos7720_port->port->minor; 1645 ss->port = mos7720_port->port->port_number; 1646 ss->irq = 0; 1647 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1648 ss->baud_base = 9600; 1649 ss->close_delay = 5*HZ; 1650 ss->closing_wait = 30*HZ; 1651 return 0; 1652 } 1653 1654 static int mos7720_ioctl(struct tty_struct *tty, 1655 unsigned int cmd, unsigned long arg) 1656 { 1657 struct usb_serial_port *port = tty->driver_data; 1658 struct moschip_port *mos7720_port; 1659 1660 mos7720_port = usb_get_serial_port_data(port); 1661 if (mos7720_port == NULL) 1662 return -ENODEV; 1663 1664 switch (cmd) { 1665 case TIOCSERGETLSR: 1666 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1667 return get_lsr_info(tty, mos7720_port, 1668 (unsigned int __user *)arg); 1669 } 1670 1671 return -ENOIOCTLCMD; 1672 } 1673 1674 static int mos7720_startup(struct usb_serial *serial) 1675 { 1676 struct usb_device *dev; 1677 char data; 1678 u16 product; 1679 int ret_val; 1680 1681 product = le16_to_cpu(serial->dev->descriptor.idProduct); 1682 dev = serial->dev; 1683 1684 if (product == MOSCHIP_DEVICE_ID_7715) { 1685 struct urb *urb = serial->port[0]->interrupt_in_urb; 1686 1687 urb->complete = mos7715_interrupt_callback; 1688 1689 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1690 ret_val = mos7715_parport_init(serial); 1691 if (ret_val < 0) 1692 return ret_val; 1693 #endif 1694 } 1695 /* start the interrupt urb */ 1696 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); 1697 if (ret_val) { 1698 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", 1699 ret_val); 1700 } 1701 1702 /* LSR For Port 1 */ 1703 read_mos_reg(serial, 0, MOS7720_LSR, &data); 1704 dev_dbg(&dev->dev, "LSR:%x\n", data); 1705 1706 return 0; 1707 } 1708 1709 static void mos7720_release(struct usb_serial *serial) 1710 { 1711 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1712 1713 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT 1714 /* close the parallel port */ 1715 1716 if (le16_to_cpu(serial->dev->descriptor.idProduct) 1717 == MOSCHIP_DEVICE_ID_7715) { 1718 struct mos7715_parport *mos_parport = 1719 usb_get_serial_data(serial); 1720 1721 /* prevent NULL ptr dereference in port callbacks */ 1722 spin_lock(&release_lock); 1723 mos_parport->pp->private_data = NULL; 1724 spin_unlock(&release_lock); 1725 1726 /* wait for synchronous usb calls to return */ 1727 if (mos_parport->msg_pending) 1728 wait_for_completion_timeout(&mos_parport->syncmsg_compl, 1729 msecs_to_jiffies(MOS_WDR_TIMEOUT)); 1730 /* 1731 * If delayed work is currently scheduled, wait for it to 1732 * complete. This also implies barriers that ensure the 1733 * below serial clearing is not hoisted above the ->work. 1734 */ 1735 cancel_work_sync(&mos_parport->work); 1736 1737 parport_remove_port(mos_parport->pp); 1738 usb_set_serial_data(serial, NULL); 1739 mos_parport->serial = NULL; 1740 1741 parport_del_port(mos_parport->pp); 1742 1743 kref_put(&mos_parport->ref_count, destroy_mos_parport); 1744 } 1745 #endif 1746 } 1747 1748 static int mos7720_port_probe(struct usb_serial_port *port) 1749 { 1750 struct moschip_port *mos7720_port; 1751 1752 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); 1753 if (!mos7720_port) 1754 return -ENOMEM; 1755 1756 mos7720_port->port = port; 1757 1758 usb_set_serial_port_data(port, mos7720_port); 1759 1760 return 0; 1761 } 1762 1763 static void mos7720_port_remove(struct usb_serial_port *port) 1764 { 1765 struct moschip_port *mos7720_port; 1766 1767 mos7720_port = usb_get_serial_port_data(port); 1768 kfree(mos7720_port); 1769 } 1770 1771 static struct usb_serial_driver moschip7720_2port_driver = { 1772 .driver = { 1773 .owner = THIS_MODULE, 1774 .name = "moschip7720", 1775 }, 1776 .description = "Moschip 2 port adapter", 1777 .id_table = id_table, 1778 .num_bulk_in = 2, 1779 .num_bulk_out = 2, 1780 .num_interrupt_in = 1, 1781 .calc_num_ports = mos77xx_calc_num_ports, 1782 .open = mos7720_open, 1783 .close = mos7720_close, 1784 .throttle = mos7720_throttle, 1785 .unthrottle = mos7720_unthrottle, 1786 .attach = mos7720_startup, 1787 .release = mos7720_release, 1788 .port_probe = mos7720_port_probe, 1789 .port_remove = mos7720_port_remove, 1790 .ioctl = mos7720_ioctl, 1791 .tiocmget = mos7720_tiocmget, 1792 .tiocmset = mos7720_tiocmset, 1793 .get_serial = get_serial_info, 1794 .set_termios = mos7720_set_termios, 1795 .write = mos7720_write, 1796 .write_room = mos7720_write_room, 1797 .chars_in_buffer = mos7720_chars_in_buffer, 1798 .break_ctl = mos7720_break, 1799 .read_bulk_callback = mos7720_bulk_in_callback, 1800 .read_int_callback = mos7720_interrupt_callback, 1801 }; 1802 1803 static struct usb_serial_driver * const serial_drivers[] = { 1804 &moschip7720_2port_driver, NULL 1805 }; 1806 1807 module_usb_serial_driver(serial_drivers, id_table); 1808 1809 MODULE_AUTHOR(DRIVER_AUTHOR); 1810 MODULE_DESCRIPTION(DRIVER_DESC); 1811 MODULE_LICENSE("GPL v2"); 1812