1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 15 * 16 * Clean ups from Moschip version and a few ioctl implementations by: 17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com> 18 * 19 * Originally based on drivers/usb/serial/io_edgeport.c which is: 20 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 22 * 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/errno.h> 27 #include <linux/init.h> 28 #include <linux/slab.h> 29 #include <linux/tty.h> 30 #include <linux/tty_driver.h> 31 #include <linux/tty_flip.h> 32 #include <linux/module.h> 33 #include <linux/serial.h> 34 #include <linux/usb.h> 35 #include <linux/usb/serial.h> 36 #include <linux/uaccess.h> 37 38 /* 39 * Version Information 40 */ 41 #define DRIVER_VERSION "1.3.1" 42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver" 43 44 /* 45 * 16C50 UART register defines 46 */ 47 48 #define LCR_BITS_5 0x00 /* 5 bits/char */ 49 #define LCR_BITS_6 0x01 /* 6 bits/char */ 50 #define LCR_BITS_7 0x02 /* 7 bits/char */ 51 #define LCR_BITS_8 0x03 /* 8 bits/char */ 52 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 53 54 #define LCR_STOP_1 0x00 /* 1 stop bit */ 55 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */ 56 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */ 57 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 58 59 #define LCR_PAR_NONE 0x00 /* No parity */ 60 #define LCR_PAR_ODD 0x08 /* Odd parity */ 61 #define LCR_PAR_EVEN 0x18 /* Even parity */ 62 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */ 63 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */ 64 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 65 66 #define LCR_SET_BREAK 0x40 /* Set Break condition */ 67 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */ 68 69 #define MCR_DTR 0x01 /* Assert DTR */ 70 #define MCR_RTS 0x02 /* Assert RTS */ 71 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */ 72 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */ 73 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */ 74 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */ 75 76 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */ 77 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */ 78 #define MOS7840_MSR_RI 0x40 /* Current state of RI */ 79 #define MOS7840_MSR_CD 0x80 /* Current state of CD */ 80 81 /* 82 * Defines used for sending commands to port 83 */ 84 85 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */ 86 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */ 87 88 #define MOS_PORT1 0x0200 89 #define MOS_PORT2 0x0300 90 #define MOS_VENREG 0x0000 91 #define MOS_MAX_PORT 0x02 92 #define MOS_WRITE 0x0E 93 #define MOS_READ 0x0D 94 95 /* Requests */ 96 #define MCS_RD_RTYPE 0xC0 97 #define MCS_WR_RTYPE 0x40 98 #define MCS_RDREQ 0x0D 99 #define MCS_WRREQ 0x0E 100 #define MCS_CTRL_TIMEOUT 500 101 #define VENDOR_READ_LENGTH (0x01) 102 103 #define MAX_NAME_LEN 64 104 105 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */ 106 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */ 107 108 /* For higher baud Rates use TIOCEXBAUD */ 109 #define TIOCEXBAUD 0x5462 110 111 /* vendor id and device id defines */ 112 113 /* The native mos7840/7820 component */ 114 #define USB_VENDOR_ID_MOSCHIP 0x9710 115 #define MOSCHIP_DEVICE_ID_7840 0x7840 116 #define MOSCHIP_DEVICE_ID_7820 0x7820 117 /* The native component can have its vendor/device id's overridden 118 * in vendor-specific implementations. Such devices can be handled 119 * by making a change here, in moschip_port_id_table, and in 120 * moschip_id_table_combined 121 */ 122 #define USB_VENDOR_ID_BANDB 0x0856 123 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44 124 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42 125 126 /* Interrupt Routine Defines */ 127 128 #define SERIAL_IIR_RLS 0x06 129 #define SERIAL_IIR_MS 0x00 130 131 /* 132 * Emulation of the bit mask on the LINE STATUS REGISTER. 133 */ 134 #define SERIAL_LSR_DR 0x0001 135 #define SERIAL_LSR_OE 0x0002 136 #define SERIAL_LSR_PE 0x0004 137 #define SERIAL_LSR_FE 0x0008 138 #define SERIAL_LSR_BI 0x0010 139 140 #define MOS_MSR_DELTA_CTS 0x10 141 #define MOS_MSR_DELTA_DSR 0x20 142 #define MOS_MSR_DELTA_RI 0x40 143 #define MOS_MSR_DELTA_CD 0x80 144 145 /* Serial Port register Address */ 146 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01)) 147 #define FIFO_CONTROL_REGISTER ((__u16)(0x02)) 148 #define LINE_CONTROL_REGISTER ((__u16)(0x03)) 149 #define MODEM_CONTROL_REGISTER ((__u16)(0x04)) 150 #define LINE_STATUS_REGISTER ((__u16)(0x05)) 151 #define MODEM_STATUS_REGISTER ((__u16)(0x06)) 152 #define SCRATCH_PAD_REGISTER ((__u16)(0x07)) 153 #define DIVISOR_LATCH_LSB ((__u16)(0x00)) 154 #define DIVISOR_LATCH_MSB ((__u16)(0x01)) 155 156 #define CLK_MULTI_REGISTER ((__u16)(0x02)) 157 #define CLK_START_VALUE_REGISTER ((__u16)(0x03)) 158 159 #define SERIAL_LCR_DLAB ((__u16)(0x0080)) 160 161 /* 162 * URB POOL related defines 163 */ 164 #define NUM_URBS 16 /* URB Count */ 165 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 166 167 168 static struct usb_device_id moschip_port_id_table[] = { 169 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 170 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 171 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 172 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 173 {} /* terminating entry */ 174 }; 175 176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = { 177 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 179 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 180 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 181 {} /* terminating entry */ 182 }; 183 184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined); 185 186 /* This structure holds all of the local port information */ 187 188 struct moschip_port { 189 int port_num; /*Actual port number in the device(1,2,etc) */ 190 struct urb *write_urb; /* write URB for this port */ 191 struct urb *read_urb; /* read URB for this port */ 192 struct urb *int_urb; 193 __u8 shadowLCR; /* last LCR value received */ 194 __u8 shadowMCR; /* last MCR value received */ 195 char open; 196 char open_ports; 197 char zombie; 198 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */ 199 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */ 200 int delta_msr_cond; 201 struct async_icount icount; 202 struct usb_serial_port *port; /* loop back to the owner of this object */ 203 204 /* Offsets */ 205 __u8 SpRegOffset; 206 __u8 ControlRegOffset; 207 __u8 DcrRegOffset; 208 /* for processing control URBS in interrupt context */ 209 struct urb *control_urb; 210 struct usb_ctrlrequest *dr; 211 char *ctrl_buf; 212 int MsrLsr; 213 214 spinlock_t pool_lock; 215 struct urb *write_urb_pool[NUM_URBS]; 216 char busy[NUM_URBS]; 217 }; 218 219 220 static int debug; 221 222 /* 223 * mos7840_set_reg_sync 224 * To set the Control register by calling usb_fill_control_urb function 225 * by passing usb_sndctrlpipe function as parameter. 226 */ 227 228 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg, 229 __u16 val) 230 { 231 struct usb_device *dev = port->serial->dev; 232 val = val & 0x00ff; 233 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val); 234 235 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 236 MCS_WR_RTYPE, val, reg, NULL, 0, 237 MOS_WDR_TIMEOUT); 238 } 239 240 /* 241 * mos7840_get_reg_sync 242 * To set the Uart register by calling usb_fill_control_urb function by 243 * passing usb_rcvctrlpipe function as parameter. 244 */ 245 246 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg, 247 __u16 *val) 248 { 249 struct usb_device *dev = port->serial->dev; 250 int ret = 0; 251 252 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 253 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH, 254 MOS_WDR_TIMEOUT); 255 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val); 256 *val = (*val) & 0x00ff; 257 return ret; 258 } 259 260 /* 261 * mos7840_set_uart_reg 262 * To set the Uart register by calling usb_fill_control_urb function by 263 * passing usb_sndctrlpipe function as parameter. 264 */ 265 266 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg, 267 __u16 val) 268 { 269 270 struct usb_device *dev = port->serial->dev; 271 val = val & 0x00ff; 272 /* For the UART control registers, the application number need 273 to be Or'ed */ 274 if (port->serial->num_ports == 4) { 275 val |= (((__u16) port->number - 276 (__u16) (port->serial->minor)) + 1) << 8; 277 dbg("mos7840_set_uart_reg application number is %x\n", val); 278 } else { 279 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) { 280 val |= (((__u16) port->number - 281 (__u16) (port->serial->minor)) + 1) << 8; 282 dbg("mos7840_set_uart_reg application number is %x\n", 283 val); 284 } else { 285 val |= 286 (((__u16) port->number - 287 (__u16) (port->serial->minor)) + 2) << 8; 288 dbg("mos7840_set_uart_reg application number is %x\n", 289 val); 290 } 291 } 292 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 293 MCS_WR_RTYPE, val, reg, NULL, 0, 294 MOS_WDR_TIMEOUT); 295 296 } 297 298 /* 299 * mos7840_get_uart_reg 300 * To set the Control register by calling usb_fill_control_urb function 301 * by passing usb_rcvctrlpipe function as parameter. 302 */ 303 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg, 304 __u16 *val) 305 { 306 struct usb_device *dev = port->serial->dev; 307 int ret = 0; 308 __u16 Wval; 309 310 /* dbg("application number is %4x \n", 311 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */ 312 /* Wval is same as application number */ 313 if (port->serial->num_ports == 4) { 314 Wval = 315 (((__u16) port->number - (__u16) (port->serial->minor)) + 316 1) << 8; 317 dbg("mos7840_get_uart_reg application number is %x\n", Wval); 318 } else { 319 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) { 320 Wval = (((__u16) port->number - 321 (__u16) (port->serial->minor)) + 1) << 8; 322 dbg("mos7840_get_uart_reg application number is %x\n", 323 Wval); 324 } else { 325 Wval = (((__u16) port->number - 326 (__u16) (port->serial->minor)) + 2) << 8; 327 dbg("mos7840_get_uart_reg application number is %x\n", 328 Wval); 329 } 330 } 331 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 332 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH, 333 MOS_WDR_TIMEOUT); 334 *val = (*val) & 0x00ff; 335 return ret; 336 } 337 338 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port) 339 { 340 341 dbg("***************************************\n"); 342 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset); 343 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset); 344 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset); 345 dbg("***************************************\n"); 346 347 } 348 349 /************************************************************************/ 350 /************************************************************************/ 351 /* I N T E R F A C E F U N C T I O N S */ 352 /* I N T E R F A C E F U N C T I O N S */ 353 /************************************************************************/ 354 /************************************************************************/ 355 356 static inline void mos7840_set_port_private(struct usb_serial_port *port, 357 struct moschip_port *data) 358 { 359 usb_set_serial_port_data(port, (void *)data); 360 } 361 362 static inline struct moschip_port *mos7840_get_port_private(struct 363 usb_serial_port 364 *port) 365 { 366 return (struct moschip_port *)usb_get_serial_port_data(port); 367 } 368 369 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr) 370 { 371 struct moschip_port *mos7840_port; 372 struct async_icount *icount; 373 mos7840_port = port; 374 icount = &mos7840_port->icount; 375 if (new_msr & 376 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI | 377 MOS_MSR_DELTA_CD)) { 378 icount = &mos7840_port->icount; 379 380 /* update input line counters */ 381 if (new_msr & MOS_MSR_DELTA_CTS) { 382 icount->cts++; 383 smp_wmb(); 384 } 385 if (new_msr & MOS_MSR_DELTA_DSR) { 386 icount->dsr++; 387 smp_wmb(); 388 } 389 if (new_msr & MOS_MSR_DELTA_CD) { 390 icount->dcd++; 391 smp_wmb(); 392 } 393 if (new_msr & MOS_MSR_DELTA_RI) { 394 icount->rng++; 395 smp_wmb(); 396 } 397 } 398 } 399 400 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr) 401 { 402 struct async_icount *icount; 403 404 dbg("%s - %02x", __func__, new_lsr); 405 406 if (new_lsr & SERIAL_LSR_BI) { 407 /* 408 * Parity and Framing errors only count if they 409 * occur exclusive of a break being 410 * received. 411 */ 412 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI); 413 } 414 415 /* update input line counters */ 416 icount = &port->icount; 417 if (new_lsr & SERIAL_LSR_BI) { 418 icount->brk++; 419 smp_wmb(); 420 } 421 if (new_lsr & SERIAL_LSR_OE) { 422 icount->overrun++; 423 smp_wmb(); 424 } 425 if (new_lsr & SERIAL_LSR_PE) { 426 icount->parity++; 427 smp_wmb(); 428 } 429 if (new_lsr & SERIAL_LSR_FE) { 430 icount->frame++; 431 smp_wmb(); 432 } 433 } 434 435 /************************************************************************/ 436 /************************************************************************/ 437 /* U S B C A L L B A C K F U N C T I O N S */ 438 /* U S B C A L L B A C K F U N C T I O N S */ 439 /************************************************************************/ 440 /************************************************************************/ 441 442 static void mos7840_control_callback(struct urb *urb) 443 { 444 unsigned char *data; 445 struct moschip_port *mos7840_port; 446 __u8 regval = 0x0; 447 int result = 0; 448 int status = urb->status; 449 450 mos7840_port = urb->context; 451 452 switch (status) { 453 case 0: 454 /* success */ 455 break; 456 case -ECONNRESET: 457 case -ENOENT: 458 case -ESHUTDOWN: 459 /* this urb is terminated, clean up */ 460 dbg("%s - urb shutting down with status: %d", __func__, 461 status); 462 return; 463 default: 464 dbg("%s - nonzero urb status received: %d", __func__, 465 status); 466 goto exit; 467 } 468 469 dbg("%s urb buffer size is %d\n", __func__, urb->actual_length); 470 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__, 471 mos7840_port->MsrLsr, mos7840_port->port_num); 472 data = urb->transfer_buffer; 473 regval = (__u8) data[0]; 474 dbg("%s data is %x\n", __func__, regval); 475 if (mos7840_port->MsrLsr == 0) 476 mos7840_handle_new_msr(mos7840_port, regval); 477 else if (mos7840_port->MsrLsr == 1) 478 mos7840_handle_new_lsr(mos7840_port, regval); 479 480 exit: 481 spin_lock(&mos7840_port->pool_lock); 482 if (!mos7840_port->zombie) 483 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC); 484 spin_unlock(&mos7840_port->pool_lock); 485 if (result) { 486 dev_err(&urb->dev->dev, 487 "%s - Error %d submitting interrupt urb\n", 488 __func__, result); 489 } 490 } 491 492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg, 493 __u16 *val) 494 { 495 struct usb_device *dev = mcs->port->serial->dev; 496 struct usb_ctrlrequest *dr = mcs->dr; 497 unsigned char *buffer = mcs->ctrl_buf; 498 int ret; 499 500 dr->bRequestType = MCS_RD_RTYPE; 501 dr->bRequest = MCS_RDREQ; 502 dr->wValue = cpu_to_le16(Wval); /* 0 */ 503 dr->wIndex = cpu_to_le16(reg); 504 dr->wLength = cpu_to_le16(2); 505 506 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0), 507 (unsigned char *)dr, buffer, 2, 508 mos7840_control_callback, mcs); 509 mcs->control_urb->transfer_buffer_length = 2; 510 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC); 511 return ret; 512 } 513 514 /***************************************************************************** 515 * mos7840_interrupt_callback 516 * this is the callback function for when we have received data on the 517 * interrupt endpoint. 518 *****************************************************************************/ 519 520 static void mos7840_interrupt_callback(struct urb *urb) 521 { 522 int result; 523 int length; 524 struct moschip_port *mos7840_port; 525 struct usb_serial *serial; 526 __u16 Data; 527 unsigned char *data; 528 __u8 sp[5], st; 529 int i, rv = 0; 530 __u16 wval, wreg = 0; 531 int status = urb->status; 532 533 dbg("%s", " : Entering\n"); 534 535 switch (status) { 536 case 0: 537 /* success */ 538 break; 539 case -ECONNRESET: 540 case -ENOENT: 541 case -ESHUTDOWN: 542 /* this urb is terminated, clean up */ 543 dbg("%s - urb shutting down with status: %d", __func__, 544 status); 545 return; 546 default: 547 dbg("%s - nonzero urb status received: %d", __func__, 548 status); 549 goto exit; 550 } 551 552 length = urb->actual_length; 553 data = urb->transfer_buffer; 554 555 serial = urb->context; 556 557 /* Moschip get 5 bytes 558 * Byte 1 IIR Port 1 (port.number is 0) 559 * Byte 2 IIR Port 2 (port.number is 1) 560 * Byte 3 IIR Port 3 (port.number is 2) 561 * Byte 4 IIR Port 4 (port.number is 3) 562 * Byte 5 FIFO status for both */ 563 564 if (length && length > 5) { 565 dbg("%s \n", "Wrong data !!!"); 566 return; 567 } 568 569 sp[0] = (__u8) data[0]; 570 sp[1] = (__u8) data[1]; 571 sp[2] = (__u8) data[2]; 572 sp[3] = (__u8) data[3]; 573 st = (__u8) data[4]; 574 575 for (i = 0; i < serial->num_ports; i++) { 576 mos7840_port = mos7840_get_port_private(serial->port[i]); 577 wval = 578 (((__u16) serial->port[i]->number - 579 (__u16) (serial->minor)) + 1) << 8; 580 if (mos7840_port->open) { 581 if (sp[i] & 0x01) { 582 dbg("SP%d No Interrupt !!!\n", i); 583 } else { 584 switch (sp[i] & 0x0f) { 585 case SERIAL_IIR_RLS: 586 dbg("Serial Port %d: Receiver status error or ", i); 587 dbg("address bit detected in 9-bit mode\n"); 588 mos7840_port->MsrLsr = 1; 589 wreg = LINE_STATUS_REGISTER; 590 break; 591 case SERIAL_IIR_MS: 592 dbg("Serial Port %d: Modem status change\n", i); 593 mos7840_port->MsrLsr = 0; 594 wreg = MODEM_STATUS_REGISTER; 595 break; 596 } 597 spin_lock(&mos7840_port->pool_lock); 598 if (!mos7840_port->zombie) { 599 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data); 600 } else { 601 spin_unlock(&mos7840_port->pool_lock); 602 return; 603 } 604 spin_unlock(&mos7840_port->pool_lock); 605 } 606 } 607 } 608 if (!(rv < 0)) 609 /* the completion handler for the control urb will resubmit */ 610 return; 611 exit: 612 result = usb_submit_urb(urb, GFP_ATOMIC); 613 if (result) { 614 dev_err(&urb->dev->dev, 615 "%s - Error %d submitting interrupt urb\n", 616 __func__, result); 617 } 618 } 619 620 static int mos7840_port_paranoia_check(struct usb_serial_port *port, 621 const char *function) 622 { 623 if (!port) { 624 dbg("%s - port == NULL", function); 625 return -1; 626 } 627 if (!port->serial) { 628 dbg("%s - port->serial == NULL", function); 629 return -1; 630 } 631 632 return 0; 633 } 634 635 /* Inline functions to check the sanity of a pointer that is passed to us */ 636 static int mos7840_serial_paranoia_check(struct usb_serial *serial, 637 const char *function) 638 { 639 if (!serial) { 640 dbg("%s - serial == NULL", function); 641 return -1; 642 } 643 if (!serial->type) { 644 dbg("%s - serial->type == NULL!", function); 645 return -1; 646 } 647 648 return 0; 649 } 650 651 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port, 652 const char *function) 653 { 654 /* if no port was specified, or it fails a paranoia check */ 655 if (!port || 656 mos7840_port_paranoia_check(port, function) || 657 mos7840_serial_paranoia_check(port->serial, function)) { 658 /* then say that we don't have a valid usb_serial thing, 659 * which will end up genrating -ENODEV return values */ 660 return NULL; 661 } 662 663 return port->serial; 664 } 665 666 /***************************************************************************** 667 * mos7840_bulk_in_callback 668 * this is the callback function for when we have received data on the 669 * bulk in endpoint. 670 *****************************************************************************/ 671 672 static void mos7840_bulk_in_callback(struct urb *urb) 673 { 674 int retval; 675 unsigned char *data; 676 struct usb_serial *serial; 677 struct usb_serial_port *port; 678 struct moschip_port *mos7840_port; 679 struct tty_struct *tty; 680 int status = urb->status; 681 682 if (status) { 683 dbg("nonzero read bulk status received: %d", status); 684 return; 685 } 686 687 mos7840_port = urb->context; 688 if (!mos7840_port) { 689 dbg("%s", "NULL mos7840_port pointer \n"); 690 return; 691 } 692 693 port = (struct usb_serial_port *)mos7840_port->port; 694 if (mos7840_port_paranoia_check(port, __func__)) { 695 dbg("%s", "Port Paranoia failed \n"); 696 return; 697 } 698 699 serial = mos7840_get_usb_serial(port, __func__); 700 if (!serial) { 701 dbg("%s\n", "Bad serial pointer "); 702 return; 703 } 704 705 dbg("%s\n", "Entering... \n"); 706 707 data = urb->transfer_buffer; 708 709 dbg("%s", "Entering ........... \n"); 710 711 if (urb->actual_length) { 712 tty = tty_port_tty_get(&mos7840_port->port->port); 713 if (tty) { 714 tty_buffer_request_room(tty, urb->actual_length); 715 tty_insert_flip_string(tty, data, urb->actual_length); 716 dbg(" %s \n", data); 717 tty_flip_buffer_push(tty); 718 tty_kref_put(tty); 719 } 720 mos7840_port->icount.rx += urb->actual_length; 721 smp_wmb(); 722 dbg("mos7840_port->icount.rx is %d:\n", 723 mos7840_port->icount.rx); 724 } 725 726 if (!mos7840_port->read_urb) { 727 dbg("%s", "URB KILLED !!!\n"); 728 return; 729 } 730 731 732 mos7840_port->read_urb->dev = serial->dev; 733 734 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 735 736 if (retval) { 737 dbg(" usb_submit_urb(read bulk) failed, retval = %d", 738 retval); 739 } 740 } 741 742 /***************************************************************************** 743 * mos7840_bulk_out_data_callback 744 * this is the callback function for when we have finished sending 745 * serial data on the bulk out endpoint. 746 *****************************************************************************/ 747 748 static void mos7840_bulk_out_data_callback(struct urb *urb) 749 { 750 struct moschip_port *mos7840_port; 751 struct tty_struct *tty; 752 int status = urb->status; 753 int i; 754 755 mos7840_port = urb->context; 756 spin_lock(&mos7840_port->pool_lock); 757 for (i = 0; i < NUM_URBS; i++) { 758 if (urb == mos7840_port->write_urb_pool[i]) { 759 mos7840_port->busy[i] = 0; 760 break; 761 } 762 } 763 spin_unlock(&mos7840_port->pool_lock); 764 765 if (status) { 766 dbg("nonzero write bulk status received:%d\n", status); 767 return; 768 } 769 770 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) { 771 dbg("%s", "Port Paranoia failed \n"); 772 return; 773 } 774 775 dbg("%s \n", "Entering ........."); 776 777 tty = tty_port_tty_get(&mos7840_port->port->port); 778 if (tty && mos7840_port->open) 779 tty_wakeup(tty); 780 tty_kref_put(tty); 781 782 } 783 784 /************************************************************************/ 785 /* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */ 786 /************************************************************************/ 787 #ifdef MCSSerialProbe 788 static int mos7840_serial_probe(struct usb_serial *serial, 789 const struct usb_device_id *id) 790 { 791 792 /*need to implement the mode_reg reading and updating\ 793 structures usb_serial_ device_type\ 794 (i.e num_ports, num_bulkin,bulkout etc) */ 795 /* Also we can update the changes attach */ 796 return 1; 797 } 798 #endif 799 800 /***************************************************************************** 801 * mos7840_open 802 * this function is called by the tty driver when a port is opened 803 * If successful, we return 0 804 * Otherwise we return a negative error number. 805 *****************************************************************************/ 806 807 static int mos7840_open(struct tty_struct *tty, 808 struct usb_serial_port *port, struct file *filp) 809 { 810 int response; 811 int j; 812 struct usb_serial *serial; 813 struct urb *urb; 814 __u16 Data; 815 int status; 816 struct moschip_port *mos7840_port; 817 struct moschip_port *port0; 818 819 if (mos7840_port_paranoia_check(port, __func__)) { 820 dbg("%s", "Port Paranoia failed \n"); 821 return -ENODEV; 822 } 823 824 serial = port->serial; 825 826 if (mos7840_serial_paranoia_check(serial, __func__)) { 827 dbg("%s", "Serial Paranoia failed \n"); 828 return -ENODEV; 829 } 830 831 mos7840_port = mos7840_get_port_private(port); 832 port0 = mos7840_get_port_private(serial->port[0]); 833 834 if (mos7840_port == NULL || port0 == NULL) 835 return -ENODEV; 836 837 usb_clear_halt(serial->dev, port->write_urb->pipe); 838 usb_clear_halt(serial->dev, port->read_urb->pipe); 839 port0->open_ports++; 840 841 /* Initialising the write urb pool */ 842 for (j = 0; j < NUM_URBS; ++j) { 843 urb = usb_alloc_urb(0, GFP_KERNEL); 844 mos7840_port->write_urb_pool[j] = urb; 845 846 if (urb == NULL) { 847 dev_err(&port->dev, "No more urbs???\n"); 848 continue; 849 } 850 851 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 852 GFP_KERNEL); 853 if (!urb->transfer_buffer) { 854 usb_free_urb(urb); 855 mos7840_port->write_urb_pool[j] = NULL; 856 dev_err(&port->dev, 857 "%s-out of memory for urb buffers.\n", 858 __func__); 859 continue; 860 } 861 } 862 863 /***************************************************************************** 864 * Initialize MCS7840 -- Write Init values to corresponding Registers 865 * 866 * Register Index 867 * 1 : IER 868 * 2 : FCR 869 * 3 : LCR 870 * 4 : MCR 871 * 872 * 0x08 : SP1/2 Control Reg 873 *****************************************************************************/ 874 875 /* NEED to check the following Block */ 876 877 Data = 0x0; 878 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 879 if (status < 0) { 880 dbg("Reading Spreg failed\n"); 881 return -1; 882 } 883 Data |= 0x80; 884 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 885 if (status < 0) { 886 dbg("writing Spreg failed\n"); 887 return -1; 888 } 889 890 Data &= ~0x80; 891 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 892 if (status < 0) { 893 dbg("writing Spreg failed\n"); 894 return -1; 895 } 896 /* End of block to be checked */ 897 898 Data = 0x0; 899 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 900 &Data); 901 if (status < 0) { 902 dbg("Reading Controlreg failed\n"); 903 return -1; 904 } 905 Data |= 0x08; /* Driver done bit */ 906 Data |= 0x20; /* rx_disable */ 907 status = mos7840_set_reg_sync(port, 908 mos7840_port->ControlRegOffset, Data); 909 if (status < 0) { 910 dbg("writing Controlreg failed\n"); 911 return -1; 912 } 913 /* do register settings here */ 914 /* Set all regs to the device default values. */ 915 /*********************************** 916 * First Disable all interrupts. 917 ***********************************/ 918 Data = 0x00; 919 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 920 if (status < 0) { 921 dbg("disableing interrupts failed\n"); 922 return -1; 923 } 924 /* Set FIFO_CONTROL_REGISTER to the default value */ 925 Data = 0x00; 926 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 927 if (status < 0) { 928 dbg("Writing FIFO_CONTROL_REGISTER failed\n"); 929 return -1; 930 } 931 932 Data = 0xcf; 933 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 934 if (status < 0) { 935 dbg("Writing FIFO_CONTROL_REGISTER failed\n"); 936 return -1; 937 } 938 939 Data = 0x03; 940 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 941 mos7840_port->shadowLCR = Data; 942 943 Data = 0x0b; 944 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 945 mos7840_port->shadowMCR = Data; 946 947 Data = 0x00; 948 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 949 mos7840_port->shadowLCR = Data; 950 951 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 952 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 953 954 Data = 0x0c; 955 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 956 957 Data = 0x0; 958 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 959 960 Data = 0x00; 961 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 962 963 Data = Data & ~SERIAL_LCR_DLAB; 964 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 965 mos7840_port->shadowLCR = Data; 966 967 /* clearing Bulkin and Bulkout Fifo */ 968 Data = 0x0; 969 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 970 971 Data = Data | 0x0c; 972 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 973 974 Data = Data & ~0x0c; 975 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 976 /* Finally enable all interrupts */ 977 Data = 0x0c; 978 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 979 980 /* clearing rx_disable */ 981 Data = 0x0; 982 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 983 &Data); 984 Data = Data & ~0x20; 985 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 986 Data); 987 988 /* rx_negate */ 989 Data = 0x0; 990 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 991 &Data); 992 Data = Data | 0x10; 993 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 994 Data); 995 996 /* force low_latency on so that our tty_push actually forces * 997 * the data through,otherwise it is scheduled, and with * 998 * high data rates (like with OHCI) data can get lost. */ 999 if (tty) 1000 tty->low_latency = 1; 1001 1002 /* Check to see if we've set up our endpoint info yet * 1003 * (can't set it up in mos7840_startup as the structures * 1004 * were not set up at that time.) */ 1005 if (port0->open_ports == 1) { 1006 if (serial->port[0]->interrupt_in_buffer == NULL) { 1007 /* set up interrupt urb */ 1008 usb_fill_int_urb(serial->port[0]->interrupt_in_urb, 1009 serial->dev, 1010 usb_rcvintpipe(serial->dev, 1011 serial->port[0]->interrupt_in_endpointAddress), 1012 serial->port[0]->interrupt_in_buffer, 1013 serial->port[0]->interrupt_in_urb-> 1014 transfer_buffer_length, 1015 mos7840_interrupt_callback, 1016 serial, 1017 serial->port[0]->interrupt_in_urb->interval); 1018 1019 /* start interrupt read for mos7840 * 1020 * will continue as long as mos7840 is connected */ 1021 1022 response = 1023 usb_submit_urb(serial->port[0]->interrupt_in_urb, 1024 GFP_KERNEL); 1025 if (response) { 1026 dev_err(&port->dev, "%s - Error %d submitting " 1027 "interrupt urb\n", __func__, response); 1028 } 1029 1030 } 1031 1032 } 1033 1034 /* see if we've set up our endpoint info yet * 1035 * (can't set it up in mos7840_startup as the * 1036 * structures were not set up at that time.) */ 1037 1038 dbg("port number is %d \n", port->number); 1039 dbg("serial number is %d \n", port->serial->minor); 1040 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress); 1041 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress); 1042 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress); 1043 dbg("port's number in the device is %d\n", mos7840_port->port_num); 1044 mos7840_port->read_urb = port->read_urb; 1045 1046 /* set up our bulk in urb */ 1047 1048 usb_fill_bulk_urb(mos7840_port->read_urb, 1049 serial->dev, 1050 usb_rcvbulkpipe(serial->dev, 1051 port->bulk_in_endpointAddress), 1052 port->bulk_in_buffer, 1053 mos7840_port->read_urb->transfer_buffer_length, 1054 mos7840_bulk_in_callback, mos7840_port); 1055 1056 dbg("mos7840_open: bulkin endpoint is %d\n", 1057 port->bulk_in_endpointAddress); 1058 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1059 if (response) { 1060 dev_err(&port->dev, "%s - Error %d submitting control urb\n", 1061 __func__, response); 1062 } 1063 1064 /* initialize our wait queues */ 1065 init_waitqueue_head(&mos7840_port->wait_chase); 1066 init_waitqueue_head(&mos7840_port->delta_msr_wait); 1067 1068 /* initialize our icount structure */ 1069 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount)); 1070 1071 /* initialize our port settings */ 1072 /* Must set to enable ints! */ 1073 mos7840_port->shadowMCR = MCR_MASTER_IE; 1074 /* send a open port command */ 1075 mos7840_port->open = 1; 1076 /* mos7840_change_port_settings(mos7840_port,old_termios); */ 1077 mos7840_port->icount.tx = 0; 1078 mos7840_port->icount.rx = 0; 1079 1080 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n", 1081 serial, mos7840_port, port); 1082 1083 return 0; 1084 1085 } 1086 1087 /***************************************************************************** 1088 * mos7840_chars_in_buffer 1089 * this function is called by the tty driver when it wants to know how many 1090 * bytes of data we currently have outstanding in the port (data that has 1091 * been written, but hasn't made it out the port yet) 1092 * If successful, we return the number of bytes left to be written in the 1093 * system, 1094 * Otherwise we return zero. 1095 *****************************************************************************/ 1096 1097 static int mos7840_chars_in_buffer(struct tty_struct *tty) 1098 { 1099 struct usb_serial_port *port = tty->driver_data; 1100 int i; 1101 int chars = 0; 1102 unsigned long flags; 1103 struct moschip_port *mos7840_port; 1104 1105 dbg("%s \n", " mos7840_chars_in_buffer:entering ..........."); 1106 1107 if (mos7840_port_paranoia_check(port, __func__)) { 1108 dbg("%s", "Invalid port \n"); 1109 return 0; 1110 } 1111 1112 mos7840_port = mos7840_get_port_private(port); 1113 if (mos7840_port == NULL) { 1114 dbg("%s \n", "mos7840_break:leaving ..........."); 1115 return 0; 1116 } 1117 1118 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1119 for (i = 0; i < NUM_URBS; ++i) 1120 if (mos7840_port->busy[i]) 1121 chars += URB_TRANSFER_BUFFER_SIZE; 1122 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1123 dbg("%s - returns %d", __func__, chars); 1124 return chars; 1125 1126 } 1127 1128 /************************************************************************ 1129 * 1130 * mos7840_block_until_tx_empty 1131 * 1132 * This function will block the close until one of the following: 1133 * 1. TX count are 0 1134 * 2. The mos7840 has stopped 1135 * 3. A timeout of 3 seconds without activity has expired 1136 * 1137 ************************************************************************/ 1138 static void mos7840_block_until_tx_empty(struct tty_struct *tty, 1139 struct moschip_port *mos7840_port) 1140 { 1141 int timeout = HZ / 10; 1142 int wait = 30; 1143 int count; 1144 1145 while (1) { 1146 1147 count = mos7840_chars_in_buffer(tty); 1148 1149 /* Check for Buffer status */ 1150 if (count <= 0) 1151 return; 1152 1153 /* Block the thread for a while */ 1154 interruptible_sleep_on_timeout(&mos7840_port->wait_chase, 1155 timeout); 1156 1157 /* No activity.. count down section */ 1158 wait--; 1159 if (wait == 0) { 1160 dbg("%s - TIMEOUT", __func__); 1161 return; 1162 } else { 1163 /* Reset timeout value back to seconds */ 1164 wait = 30; 1165 } 1166 } 1167 } 1168 1169 /***************************************************************************** 1170 * mos7840_close 1171 * this function is called by the tty driver when a port is closed 1172 *****************************************************************************/ 1173 1174 static void mos7840_close(struct tty_struct *tty, 1175 struct usb_serial_port *port, struct file *filp) 1176 { 1177 struct usb_serial *serial; 1178 struct moschip_port *mos7840_port; 1179 struct moschip_port *port0; 1180 int j; 1181 __u16 Data; 1182 1183 dbg("%s\n", "mos7840_close:entering..."); 1184 1185 if (mos7840_port_paranoia_check(port, __func__)) { 1186 dbg("%s", "Port Paranoia failed \n"); 1187 return; 1188 } 1189 1190 serial = mos7840_get_usb_serial(port, __func__); 1191 if (!serial) { 1192 dbg("%s", "Serial Paranoia failed \n"); 1193 return; 1194 } 1195 1196 mos7840_port = mos7840_get_port_private(port); 1197 port0 = mos7840_get_port_private(serial->port[0]); 1198 1199 if (mos7840_port == NULL || port0 == NULL) 1200 return; 1201 1202 for (j = 0; j < NUM_URBS; ++j) 1203 usb_kill_urb(mos7840_port->write_urb_pool[j]); 1204 1205 /* Freeing Write URBs */ 1206 for (j = 0; j < NUM_URBS; ++j) { 1207 if (mos7840_port->write_urb_pool[j]) { 1208 if (mos7840_port->write_urb_pool[j]->transfer_buffer) 1209 kfree(mos7840_port->write_urb_pool[j]-> 1210 transfer_buffer); 1211 1212 usb_free_urb(mos7840_port->write_urb_pool[j]); 1213 } 1214 } 1215 1216 if (serial->dev) 1217 /* flush and block until tx is empty */ 1218 mos7840_block_until_tx_empty(tty, mos7840_port); 1219 1220 /* While closing port, shutdown all bulk read, write * 1221 * and interrupt read if they exists */ 1222 if (serial->dev) { 1223 if (mos7840_port->write_urb) { 1224 dbg("%s", "Shutdown bulk write\n"); 1225 usb_kill_urb(mos7840_port->write_urb); 1226 } 1227 if (mos7840_port->read_urb) { 1228 dbg("%s", "Shutdown bulk read\n"); 1229 usb_kill_urb(mos7840_port->read_urb); 1230 } 1231 if ((&mos7840_port->control_urb)) { 1232 dbg("%s", "Shutdown control read\n"); 1233 /*/ usb_kill_urb (mos7840_port->control_urb); */ 1234 } 1235 } 1236 /* if(mos7840_port->ctrl_buf != NULL) */ 1237 /* kfree(mos7840_port->ctrl_buf); */ 1238 port0->open_ports--; 1239 dbg("mos7840_num_open_ports in close%d:in port%d\n", 1240 port0->open_ports, port->number); 1241 if (port0->open_ports == 0) { 1242 if (serial->port[0]->interrupt_in_urb) { 1243 dbg("%s", "Shutdown interrupt_in_urb\n"); 1244 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1245 } 1246 } 1247 1248 if (mos7840_port->write_urb) { 1249 /* if this urb had a transfer buffer already (old tx) free it */ 1250 if (mos7840_port->write_urb->transfer_buffer != NULL) 1251 kfree(mos7840_port->write_urb->transfer_buffer); 1252 usb_free_urb(mos7840_port->write_urb); 1253 } 1254 1255 Data = 0x0; 1256 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1257 1258 Data = 0x00; 1259 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1260 1261 mos7840_port->open = 0; 1262 1263 dbg("%s \n", "Leaving ............"); 1264 } 1265 1266 /************************************************************************ 1267 * 1268 * mos7840_block_until_chase_response 1269 * 1270 * This function will block the close until one of the following: 1271 * 1. Response to our Chase comes from mos7840 1272 * 2. A timeout of 10 seconds without activity has expired 1273 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty) 1274 * 1275 ************************************************************************/ 1276 1277 static void mos7840_block_until_chase_response(struct tty_struct *tty, 1278 struct moschip_port *mos7840_port) 1279 { 1280 int timeout = 1 * HZ; 1281 int wait = 10; 1282 int count; 1283 1284 while (1) { 1285 count = mos7840_chars_in_buffer(tty); 1286 1287 /* Check for Buffer status */ 1288 if (count <= 0) 1289 return; 1290 1291 /* Block the thread for a while */ 1292 interruptible_sleep_on_timeout(&mos7840_port->wait_chase, 1293 timeout); 1294 /* No activity.. count down section */ 1295 wait--; 1296 if (wait == 0) { 1297 dbg("%s - TIMEOUT", __func__); 1298 return; 1299 } else { 1300 /* Reset timeout value back to seconds */ 1301 wait = 10; 1302 } 1303 } 1304 1305 } 1306 1307 /***************************************************************************** 1308 * mos7840_break 1309 * this function sends a break to the port 1310 *****************************************************************************/ 1311 static void mos7840_break(struct tty_struct *tty, int break_state) 1312 { 1313 struct usb_serial_port *port = tty->driver_data; 1314 unsigned char data; 1315 struct usb_serial *serial; 1316 struct moschip_port *mos7840_port; 1317 1318 dbg("%s \n", "Entering ..........."); 1319 dbg("mos7840_break: Start\n"); 1320 1321 if (mos7840_port_paranoia_check(port, __func__)) { 1322 dbg("%s", "Port Paranoia failed \n"); 1323 return; 1324 } 1325 1326 serial = mos7840_get_usb_serial(port, __func__); 1327 if (!serial) { 1328 dbg("%s", "Serial Paranoia failed \n"); 1329 return; 1330 } 1331 1332 mos7840_port = mos7840_get_port_private(port); 1333 1334 if (mos7840_port == NULL) 1335 return; 1336 1337 if (serial->dev) 1338 /* flush and block until tx is empty */ 1339 mos7840_block_until_chase_response(tty, mos7840_port); 1340 1341 if (break_state == -1) 1342 data = mos7840_port->shadowLCR | LCR_SET_BREAK; 1343 else 1344 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK; 1345 1346 /* FIXME: no locking on shadowLCR anywhere in driver */ 1347 mos7840_port->shadowLCR = data; 1348 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n", 1349 mos7840_port->shadowLCR); 1350 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, 1351 mos7840_port->shadowLCR); 1352 1353 return; 1354 } 1355 1356 /***************************************************************************** 1357 * mos7840_write_room 1358 * this function is called by the tty driver when it wants to know how many 1359 * bytes of data we can accept for a specific port. 1360 * If successful, we return the amount of room that we have for this port 1361 * Otherwise we return a negative error number. 1362 *****************************************************************************/ 1363 1364 static int mos7840_write_room(struct tty_struct *tty) 1365 { 1366 struct usb_serial_port *port = tty->driver_data; 1367 int i; 1368 int room = 0; 1369 unsigned long flags; 1370 struct moschip_port *mos7840_port; 1371 1372 dbg("%s \n", " mos7840_write_room:entering ..........."); 1373 1374 if (mos7840_port_paranoia_check(port, __func__)) { 1375 dbg("%s", "Invalid port \n"); 1376 dbg("%s \n", " mos7840_write_room:leaving ..........."); 1377 return -1; 1378 } 1379 1380 mos7840_port = mos7840_get_port_private(port); 1381 if (mos7840_port == NULL) { 1382 dbg("%s \n", "mos7840_break:leaving ..........."); 1383 return -1; 1384 } 1385 1386 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1387 for (i = 0; i < NUM_URBS; ++i) { 1388 if (!mos7840_port->busy[i]) 1389 room += URB_TRANSFER_BUFFER_SIZE; 1390 } 1391 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1392 1393 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1; 1394 dbg("%s - returns %d", __func__, room); 1395 return room; 1396 1397 } 1398 1399 /***************************************************************************** 1400 * mos7840_write 1401 * this function is called by the tty driver when data should be written to 1402 * the port. 1403 * If successful, we return the number of bytes written, otherwise we 1404 * return a negative error number. 1405 *****************************************************************************/ 1406 1407 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 1408 const unsigned char *data, int count) 1409 { 1410 int status; 1411 int i; 1412 int bytes_sent = 0; 1413 int transfer_size; 1414 unsigned long flags; 1415 1416 struct moschip_port *mos7840_port; 1417 struct usb_serial *serial; 1418 struct urb *urb; 1419 /* __u16 Data; */ 1420 const unsigned char *current_position = data; 1421 unsigned char *data1; 1422 dbg("%s \n", "entering ..........."); 1423 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1424 mos7840_port->shadowLCR); */ 1425 1426 #ifdef NOTMOS7840 1427 Data = 0x00; 1428 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 1429 mos7840_port->shadowLCR = Data; 1430 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data); 1431 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1432 mos7840_port->shadowLCR); 1433 1434 /* Data = 0x03; */ 1435 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */ 1436 /* mos7840_port->shadowLCR=Data;//Need to add later */ 1437 1438 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 1439 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1440 1441 /* Data = 0x0c; */ 1442 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */ 1443 Data = 0x00; 1444 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data); 1445 dbg("mos7840_write:DLL value is %x\n", Data); 1446 1447 Data = 0x0; 1448 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data); 1449 dbg("mos7840_write:DLM value is %x\n", Data); 1450 1451 Data = Data & ~SERIAL_LCR_DLAB; 1452 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1453 mos7840_port->shadowLCR); 1454 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1455 #endif 1456 1457 if (mos7840_port_paranoia_check(port, __func__)) { 1458 dbg("%s", "Port Paranoia failed \n"); 1459 return -1; 1460 } 1461 1462 serial = port->serial; 1463 if (mos7840_serial_paranoia_check(serial, __func__)) { 1464 dbg("%s", "Serial Paranoia failed \n"); 1465 return -1; 1466 } 1467 1468 mos7840_port = mos7840_get_port_private(port); 1469 if (mos7840_port == NULL) { 1470 dbg("%s", "mos7840_port is NULL\n"); 1471 return -1; 1472 } 1473 1474 /* try to find a free urb in the list */ 1475 urb = NULL; 1476 1477 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1478 for (i = 0; i < NUM_URBS; ++i) { 1479 if (!mos7840_port->busy[i]) { 1480 mos7840_port->busy[i] = 1; 1481 urb = mos7840_port->write_urb_pool[i]; 1482 dbg("\nURB:%d", i); 1483 break; 1484 } 1485 } 1486 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1487 1488 if (urb == NULL) { 1489 dbg("%s - no more free urbs", __func__); 1490 goto exit; 1491 } 1492 1493 if (urb->transfer_buffer == NULL) { 1494 urb->transfer_buffer = 1495 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL); 1496 1497 if (urb->transfer_buffer == NULL) { 1498 dev_err(&port->dev, "%s no more kernel memory...\n", 1499 __func__); 1500 goto exit; 1501 } 1502 } 1503 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1504 1505 memcpy(urb->transfer_buffer, current_position, transfer_size); 1506 1507 /* fill urb with data and submit */ 1508 usb_fill_bulk_urb(urb, 1509 serial->dev, 1510 usb_sndbulkpipe(serial->dev, 1511 port->bulk_out_endpointAddress), 1512 urb->transfer_buffer, 1513 transfer_size, 1514 mos7840_bulk_out_data_callback, mos7840_port); 1515 1516 data1 = urb->transfer_buffer; 1517 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress); 1518 1519 /* send it down the pipe */ 1520 status = usb_submit_urb(urb, GFP_ATOMIC); 1521 1522 if (status) { 1523 mos7840_port->busy[i] = 0; 1524 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed " 1525 "with status = %d\n", __func__, status); 1526 bytes_sent = status; 1527 goto exit; 1528 } 1529 bytes_sent = transfer_size; 1530 mos7840_port->icount.tx += transfer_size; 1531 smp_wmb(); 1532 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx); 1533 exit: 1534 return bytes_sent; 1535 1536 } 1537 1538 /***************************************************************************** 1539 * mos7840_throttle 1540 * this function is called by the tty driver when it wants to stop the data 1541 * being read from the port. 1542 *****************************************************************************/ 1543 1544 static void mos7840_throttle(struct tty_struct *tty) 1545 { 1546 struct usb_serial_port *port = tty->driver_data; 1547 struct moschip_port *mos7840_port; 1548 int status; 1549 1550 if (mos7840_port_paranoia_check(port, __func__)) { 1551 dbg("%s", "Invalid port \n"); 1552 return; 1553 } 1554 1555 dbg("- port %d\n", port->number); 1556 1557 mos7840_port = mos7840_get_port_private(port); 1558 1559 if (mos7840_port == NULL) 1560 return; 1561 1562 if (!mos7840_port->open) { 1563 dbg("%s\n", "port not opened"); 1564 return; 1565 } 1566 1567 dbg("%s", "Entering .......... \n"); 1568 1569 /* if we are implementing XON/XOFF, send the stop character */ 1570 if (I_IXOFF(tty)) { 1571 unsigned char stop_char = STOP_CHAR(tty); 1572 status = mos7840_write(tty, port, &stop_char, 1); 1573 if (status <= 0) 1574 return; 1575 } 1576 /* if we are implementing RTS/CTS, toggle that line */ 1577 if (tty->termios->c_cflag & CRTSCTS) { 1578 mos7840_port->shadowMCR &= ~MCR_RTS; 1579 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1580 mos7840_port->shadowMCR); 1581 if (status < 0) 1582 return; 1583 } 1584 1585 return; 1586 } 1587 1588 /***************************************************************************** 1589 * mos7840_unthrottle 1590 * this function is called by the tty driver when it wants to resume 1591 * the data being read from the port (called after mos7840_throttle is 1592 * called) 1593 *****************************************************************************/ 1594 static void mos7840_unthrottle(struct tty_struct *tty) 1595 { 1596 struct usb_serial_port *port = tty->driver_data; 1597 int status; 1598 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1599 1600 if (mos7840_port_paranoia_check(port, __func__)) { 1601 dbg("%s", "Invalid port \n"); 1602 return; 1603 } 1604 1605 if (mos7840_port == NULL) 1606 return; 1607 1608 if (!mos7840_port->open) { 1609 dbg("%s - port not opened", __func__); 1610 return; 1611 } 1612 1613 dbg("%s", "Entering .......... \n"); 1614 1615 /* if we are implementing XON/XOFF, send the start character */ 1616 if (I_IXOFF(tty)) { 1617 unsigned char start_char = START_CHAR(tty); 1618 status = mos7840_write(tty, port, &start_char, 1); 1619 if (status <= 0) 1620 return; 1621 } 1622 1623 /* if we are implementing RTS/CTS, toggle that line */ 1624 if (tty->termios->c_cflag & CRTSCTS) { 1625 mos7840_port->shadowMCR |= MCR_RTS; 1626 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1627 mos7840_port->shadowMCR); 1628 if (status < 0) 1629 return; 1630 } 1631 } 1632 1633 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file) 1634 { 1635 struct usb_serial_port *port = tty->driver_data; 1636 struct moschip_port *mos7840_port; 1637 unsigned int result; 1638 __u16 msr; 1639 __u16 mcr; 1640 int status; 1641 mos7840_port = mos7840_get_port_private(port); 1642 1643 dbg("%s - port %d", __func__, port->number); 1644 1645 if (mos7840_port == NULL) 1646 return -ENODEV; 1647 1648 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); 1649 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); 1650 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) 1651 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) 1652 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) 1653 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) 1654 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) 1655 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) 1656 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); 1657 1658 dbg("%s - 0x%04X", __func__, result); 1659 1660 return result; 1661 } 1662 1663 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file, 1664 unsigned int set, unsigned int clear) 1665 { 1666 struct usb_serial_port *port = tty->driver_data; 1667 struct moschip_port *mos7840_port; 1668 unsigned int mcr; 1669 int status; 1670 1671 dbg("%s - port %d", __func__, port->number); 1672 1673 mos7840_port = mos7840_get_port_private(port); 1674 1675 if (mos7840_port == NULL) 1676 return -ENODEV; 1677 1678 /* FIXME: What locks the port registers ? */ 1679 mcr = mos7840_port->shadowMCR; 1680 if (clear & TIOCM_RTS) 1681 mcr &= ~MCR_RTS; 1682 if (clear & TIOCM_DTR) 1683 mcr &= ~MCR_DTR; 1684 if (clear & TIOCM_LOOP) 1685 mcr &= ~MCR_LOOPBACK; 1686 1687 if (set & TIOCM_RTS) 1688 mcr |= MCR_RTS; 1689 if (set & TIOCM_DTR) 1690 mcr |= MCR_DTR; 1691 if (set & TIOCM_LOOP) 1692 mcr |= MCR_LOOPBACK; 1693 1694 mos7840_port->shadowMCR = mcr; 1695 1696 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr); 1697 if (status < 0) { 1698 dbg("setting MODEM_CONTROL_REGISTER Failed\n"); 1699 return status; 1700 } 1701 1702 return 0; 1703 } 1704 1705 /***************************************************************************** 1706 * mos7840_calc_baud_rate_divisor 1707 * this function calculates the proper baud rate divisor for the specified 1708 * baud rate. 1709 *****************************************************************************/ 1710 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor, 1711 __u16 *clk_sel_val) 1712 { 1713 1714 dbg("%s - %d", __func__, baudRate); 1715 1716 if (baudRate <= 115200) { 1717 *divisor = 115200 / baudRate; 1718 *clk_sel_val = 0x0; 1719 } 1720 if ((baudRate > 115200) && (baudRate <= 230400)) { 1721 *divisor = 230400 / baudRate; 1722 *clk_sel_val = 0x10; 1723 } else if ((baudRate > 230400) && (baudRate <= 403200)) { 1724 *divisor = 403200 / baudRate; 1725 *clk_sel_val = 0x20; 1726 } else if ((baudRate > 403200) && (baudRate <= 460800)) { 1727 *divisor = 460800 / baudRate; 1728 *clk_sel_val = 0x30; 1729 } else if ((baudRate > 460800) && (baudRate <= 806400)) { 1730 *divisor = 806400 / baudRate; 1731 *clk_sel_val = 0x40; 1732 } else if ((baudRate > 806400) && (baudRate <= 921600)) { 1733 *divisor = 921600 / baudRate; 1734 *clk_sel_val = 0x50; 1735 } else if ((baudRate > 921600) && (baudRate <= 1572864)) { 1736 *divisor = 1572864 / baudRate; 1737 *clk_sel_val = 0x60; 1738 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { 1739 *divisor = 3145728 / baudRate; 1740 *clk_sel_val = 0x70; 1741 } 1742 return 0; 1743 1744 #ifdef NOTMCS7840 1745 1746 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) { 1747 if (mos7840_divisor_table[i].BaudRate == baudrate) { 1748 *divisor = mos7840_divisor_table[i].Divisor; 1749 return 0; 1750 } 1751 } 1752 1753 /* After trying for all the standard baud rates * 1754 * Try calculating the divisor for this baud rate */ 1755 1756 if (baudrate > 75 && baudrate < 230400) { 1757 /* get the divisor */ 1758 custom = (__u16) (230400L / baudrate); 1759 1760 /* Check for round off */ 1761 round1 = (__u16) (2304000L / baudrate); 1762 round = (__u16) (round1 - (custom * 10)); 1763 if (round > 4) 1764 custom++; 1765 *divisor = custom; 1766 1767 dbg(" Baud %d = %d\n", baudrate, custom); 1768 return 0; 1769 } 1770 1771 dbg("%s\n", " Baud calculation Failed..."); 1772 return -1; 1773 #endif 1774 } 1775 1776 /***************************************************************************** 1777 * mos7840_send_cmd_write_baud_rate 1778 * this function sends the proper command to change the baud rate of the 1779 * specified port. 1780 *****************************************************************************/ 1781 1782 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, 1783 int baudRate) 1784 { 1785 int divisor = 0; 1786 int status; 1787 __u16 Data; 1788 unsigned char number; 1789 __u16 clk_sel_val; 1790 struct usb_serial_port *port; 1791 1792 if (mos7840_port == NULL) 1793 return -1; 1794 1795 port = (struct usb_serial_port *)mos7840_port->port; 1796 if (mos7840_port_paranoia_check(port, __func__)) { 1797 dbg("%s", "Invalid port \n"); 1798 return -1; 1799 } 1800 1801 if (mos7840_serial_paranoia_check(port->serial, __func__)) { 1802 dbg("%s", "Invalid Serial \n"); 1803 return -1; 1804 } 1805 1806 dbg("%s", "Entering .......... \n"); 1807 1808 number = mos7840_port->port->number - mos7840_port->port->serial->minor; 1809 1810 dbg("%s - port = %d, baud = %d", __func__, 1811 mos7840_port->port->number, baudRate); 1812 /* reset clk_uart_sel in spregOffset */ 1813 if (baudRate > 115200) { 1814 #ifdef HW_flow_control 1815 /* NOTE: need to see the pther register to modify */ 1816 /* setting h/w flow control bit to 1 */ 1817 Data = 0x2b; 1818 mos7840_port->shadowMCR = Data; 1819 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1820 Data); 1821 if (status < 0) { 1822 dbg("Writing spreg failed in set_serial_baud\n"); 1823 return -1; 1824 } 1825 #endif 1826 1827 } else { 1828 #ifdef HW_flow_control 1829 / *setting h/w flow control bit to 0 */ 1830 Data = 0xb; 1831 mos7840_port->shadowMCR = Data; 1832 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1833 Data); 1834 if (status < 0) { 1835 dbg("Writing spreg failed in set_serial_baud\n"); 1836 return -1; 1837 } 1838 #endif 1839 1840 } 1841 1842 if (1) { /* baudRate <= 115200) */ 1843 clk_sel_val = 0x0; 1844 Data = 0x0; 1845 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor, 1846 &clk_sel_val); 1847 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, 1848 &Data); 1849 if (status < 0) { 1850 dbg("reading spreg failed in set_serial_baud\n"); 1851 return -1; 1852 } 1853 Data = (Data & 0x8f) | clk_sel_val; 1854 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, 1855 Data); 1856 if (status < 0) { 1857 dbg("Writing spreg failed in set_serial_baud\n"); 1858 return -1; 1859 } 1860 /* Calculate the Divisor */ 1861 1862 if (status) { 1863 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1864 return status; 1865 } 1866 /* Enable access to divisor latch */ 1867 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB; 1868 mos7840_port->shadowLCR = Data; 1869 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1870 1871 /* Write the divisor */ 1872 Data = (unsigned char)(divisor & 0xff); 1873 dbg("set_serial_baud Value to write DLL is %x\n", Data); 1874 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 1875 1876 Data = (unsigned char)((divisor & 0xff00) >> 8); 1877 dbg("set_serial_baud Value to write DLM is %x\n", Data); 1878 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 1879 1880 /* Disable access to divisor latch */ 1881 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB; 1882 mos7840_port->shadowLCR = Data; 1883 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1884 1885 } 1886 return status; 1887 } 1888 1889 /***************************************************************************** 1890 * mos7840_change_port_settings 1891 * This routine is called to set the UART on the device to match 1892 * the specified new settings. 1893 *****************************************************************************/ 1894 1895 static void mos7840_change_port_settings(struct tty_struct *tty, 1896 struct moschip_port *mos7840_port, struct ktermios *old_termios) 1897 { 1898 int baud; 1899 unsigned cflag; 1900 unsigned iflag; 1901 __u8 lData; 1902 __u8 lParity; 1903 __u8 lStop; 1904 int status; 1905 __u16 Data; 1906 struct usb_serial_port *port; 1907 struct usb_serial *serial; 1908 1909 if (mos7840_port == NULL) 1910 return; 1911 1912 port = (struct usb_serial_port *)mos7840_port->port; 1913 1914 if (mos7840_port_paranoia_check(port, __func__)) { 1915 dbg("%s", "Invalid port \n"); 1916 return; 1917 } 1918 1919 if (mos7840_serial_paranoia_check(port->serial, __func__)) { 1920 dbg("%s", "Invalid Serial \n"); 1921 return; 1922 } 1923 1924 serial = port->serial; 1925 1926 dbg("%s - port %d", __func__, mos7840_port->port->number); 1927 1928 if (!mos7840_port->open) { 1929 dbg("%s - port not opened", __func__); 1930 return; 1931 } 1932 1933 dbg("%s", "Entering .......... \n"); 1934 1935 lData = LCR_BITS_8; 1936 lStop = LCR_STOP_1; 1937 lParity = LCR_PAR_NONE; 1938 1939 cflag = tty->termios->c_cflag; 1940 iflag = tty->termios->c_iflag; 1941 1942 /* Change the number of bits */ 1943 if (cflag & CSIZE) { 1944 switch (cflag & CSIZE) { 1945 case CS5: 1946 lData = LCR_BITS_5; 1947 break; 1948 1949 case CS6: 1950 lData = LCR_BITS_6; 1951 break; 1952 1953 case CS7: 1954 lData = LCR_BITS_7; 1955 break; 1956 default: 1957 case CS8: 1958 lData = LCR_BITS_8; 1959 break; 1960 } 1961 } 1962 /* Change the Parity bit */ 1963 if (cflag & PARENB) { 1964 if (cflag & PARODD) { 1965 lParity = LCR_PAR_ODD; 1966 dbg("%s - parity = odd", __func__); 1967 } else { 1968 lParity = LCR_PAR_EVEN; 1969 dbg("%s - parity = even", __func__); 1970 } 1971 1972 } else { 1973 dbg("%s - parity = none", __func__); 1974 } 1975 1976 if (cflag & CMSPAR) 1977 lParity = lParity | 0x20; 1978 1979 /* Change the Stop bit */ 1980 if (cflag & CSTOPB) { 1981 lStop = LCR_STOP_2; 1982 dbg("%s - stop bits = 2", __func__); 1983 } else { 1984 lStop = LCR_STOP_1; 1985 dbg("%s - stop bits = 1", __func__); 1986 } 1987 1988 /* Update the LCR with the correct value */ 1989 mos7840_port->shadowLCR &= 1990 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1991 mos7840_port->shadowLCR |= (lData | lParity | lStop); 1992 1993 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n", 1994 mos7840_port->shadowLCR); 1995 /* Disable Interrupts */ 1996 Data = 0x00; 1997 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1998 1999 Data = 0x00; 2000 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 2001 2002 Data = 0xcf; 2003 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 2004 2005 /* Send the updated LCR value to the mos7840 */ 2006 Data = mos7840_port->shadowLCR; 2007 2008 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 2009 2010 Data = 0x00b; 2011 mos7840_port->shadowMCR = Data; 2012 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2013 Data = 0x00b; 2014 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2015 2016 /* set up the MCR register and send it to the mos7840 */ 2017 2018 mos7840_port->shadowMCR = MCR_MASTER_IE; 2019 if (cflag & CBAUD) 2020 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS); 2021 2022 if (cflag & CRTSCTS) 2023 mos7840_port->shadowMCR |= (MCR_XON_ANY); 2024 else 2025 mos7840_port->shadowMCR &= ~(MCR_XON_ANY); 2026 2027 Data = mos7840_port->shadowMCR; 2028 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2029 2030 /* Determine divisor based on baud rate */ 2031 baud = tty_get_baud_rate(tty); 2032 2033 if (!baud) { 2034 /* pick a default, any default... */ 2035 dbg("%s\n", "Picked default baud..."); 2036 baud = 9600; 2037 } 2038 2039 dbg("%s - baud rate = %d", __func__, baud); 2040 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); 2041 2042 /* Enable Interrupts */ 2043 Data = 0x0c; 2044 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 2045 2046 if (mos7840_port->read_urb->status != -EINPROGRESS) { 2047 mos7840_port->read_urb->dev = serial->dev; 2048 2049 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 2050 2051 if (status) { 2052 dbg(" usb_submit_urb(read bulk) failed, status = %d", 2053 status); 2054 } 2055 } 2056 wake_up(&mos7840_port->delta_msr_wait); 2057 mos7840_port->delta_msr_cond = 1; 2058 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n", 2059 mos7840_port->shadowLCR); 2060 2061 return; 2062 } 2063 2064 /***************************************************************************** 2065 * mos7840_set_termios 2066 * this function is called by the tty driver when it wants to change 2067 * the termios structure 2068 *****************************************************************************/ 2069 2070 static void mos7840_set_termios(struct tty_struct *tty, 2071 struct usb_serial_port *port, 2072 struct ktermios *old_termios) 2073 { 2074 int status; 2075 unsigned int cflag; 2076 struct usb_serial *serial; 2077 struct moschip_port *mos7840_port; 2078 dbg("mos7840_set_termios: START\n"); 2079 if (mos7840_port_paranoia_check(port, __func__)) { 2080 dbg("%s", "Invalid port \n"); 2081 return; 2082 } 2083 2084 serial = port->serial; 2085 2086 if (mos7840_serial_paranoia_check(serial, __func__)) { 2087 dbg("%s", "Invalid Serial \n"); 2088 return; 2089 } 2090 2091 mos7840_port = mos7840_get_port_private(port); 2092 2093 if (mos7840_port == NULL) 2094 return; 2095 2096 if (!mos7840_port->open) { 2097 dbg("%s - port not opened", __func__); 2098 return; 2099 } 2100 2101 dbg("%s\n", "setting termios - "); 2102 2103 cflag = tty->termios->c_cflag; 2104 2105 dbg("%s - clfag %08x iflag %08x", __func__, 2106 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag)); 2107 dbg("%s - old clfag %08x old iflag %08x", __func__, 2108 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 2109 dbg("%s - port %d", __func__, port->number); 2110 2111 /* change the port settings to the new ones specified */ 2112 2113 mos7840_change_port_settings(tty, mos7840_port, old_termios); 2114 2115 if (!mos7840_port->read_urb) { 2116 dbg("%s", "URB KILLED !!!!!\n"); 2117 return; 2118 } 2119 2120 if (mos7840_port->read_urb->status != -EINPROGRESS) { 2121 mos7840_port->read_urb->dev = serial->dev; 2122 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 2123 if (status) { 2124 dbg(" usb_submit_urb(read bulk) failed, status = %d", 2125 status); 2126 } 2127 } 2128 return; 2129 } 2130 2131 /***************************************************************************** 2132 * mos7840_get_lsr_info - get line status register info 2133 * 2134 * Purpose: Let user call ioctl() to get info when the UART physically 2135 * is emptied. On bus types like RS485, the transmitter must 2136 * release the bus after transmitting. This must be done when 2137 * the transmit shift register is empty, not be done when the 2138 * transmit holding register is empty. This functionality 2139 * allows an RS485 driver to be written in user space. 2140 *****************************************************************************/ 2141 2142 static int mos7840_get_lsr_info(struct tty_struct *tty, 2143 unsigned int __user *value) 2144 { 2145 int count; 2146 unsigned int result = 0; 2147 2148 count = mos7840_chars_in_buffer(tty); 2149 if (count == 0) { 2150 dbg("%s -- Empty", __func__); 2151 result = TIOCSER_TEMT; 2152 } 2153 2154 if (copy_to_user(value, &result, sizeof(int))) 2155 return -EFAULT; 2156 return 0; 2157 } 2158 2159 /***************************************************************************** 2160 * mos7840_set_modem_info 2161 * function to set modem info 2162 *****************************************************************************/ 2163 2164 /* FIXME: Should be using the model control hooks */ 2165 2166 static int mos7840_set_modem_info(struct moschip_port *mos7840_port, 2167 unsigned int cmd, unsigned int __user *value) 2168 { 2169 unsigned int mcr; 2170 unsigned int arg; 2171 __u16 Data; 2172 int status; 2173 struct usb_serial_port *port; 2174 2175 if (mos7840_port == NULL) 2176 return -1; 2177 2178 port = (struct usb_serial_port *)mos7840_port->port; 2179 if (mos7840_port_paranoia_check(port, __func__)) { 2180 dbg("%s", "Invalid port \n"); 2181 return -1; 2182 } 2183 2184 mcr = mos7840_port->shadowMCR; 2185 2186 if (copy_from_user(&arg, value, sizeof(int))) 2187 return -EFAULT; 2188 2189 switch (cmd) { 2190 case TIOCMBIS: 2191 if (arg & TIOCM_RTS) 2192 mcr |= MCR_RTS; 2193 if (arg & TIOCM_DTR) 2194 mcr |= MCR_RTS; 2195 if (arg & TIOCM_LOOP) 2196 mcr |= MCR_LOOPBACK; 2197 break; 2198 2199 case TIOCMBIC: 2200 if (arg & TIOCM_RTS) 2201 mcr &= ~MCR_RTS; 2202 if (arg & TIOCM_DTR) 2203 mcr &= ~MCR_RTS; 2204 if (arg & TIOCM_LOOP) 2205 mcr &= ~MCR_LOOPBACK; 2206 break; 2207 2208 case TIOCMSET: 2209 /* turn off the RTS and DTR and LOOPBACK 2210 * and then only turn on what was asked to */ 2211 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK); 2212 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0); 2213 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0); 2214 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0); 2215 break; 2216 } 2217 2218 lock_kernel(); 2219 mos7840_port->shadowMCR = mcr; 2220 2221 Data = mos7840_port->shadowMCR; 2222 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2223 unlock_kernel(); 2224 if (status < 0) { 2225 dbg("setting MODEM_CONTROL_REGISTER Failed\n"); 2226 return -1; 2227 } 2228 2229 return 0; 2230 } 2231 2232 /***************************************************************************** 2233 * mos7840_get_modem_info 2234 * function to get modem info 2235 *****************************************************************************/ 2236 2237 static int mos7840_get_modem_info(struct moschip_port *mos7840_port, 2238 unsigned int __user *value) 2239 { 2240 unsigned int result = 0; 2241 __u16 msr; 2242 unsigned int mcr = mos7840_port->shadowMCR; 2243 mos7840_get_uart_reg(mos7840_port->port, 2244 MODEM_STATUS_REGISTER, &msr); 2245 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 2246 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 2247 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 2248 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */ 2249 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 2250 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 2251 2252 dbg("%s -- %x", __func__, result); 2253 2254 if (copy_to_user(value, &result, sizeof(int))) 2255 return -EFAULT; 2256 return 0; 2257 } 2258 2259 /***************************************************************************** 2260 * mos7840_get_serial_info 2261 * function to get information about serial port 2262 *****************************************************************************/ 2263 2264 static int mos7840_get_serial_info(struct moschip_port *mos7840_port, 2265 struct serial_struct __user *retinfo) 2266 { 2267 struct serial_struct tmp; 2268 2269 if (mos7840_port == NULL) 2270 return -1; 2271 2272 if (!retinfo) 2273 return -EFAULT; 2274 2275 memset(&tmp, 0, sizeof(tmp)); 2276 2277 tmp.type = PORT_16550A; 2278 tmp.line = mos7840_port->port->serial->minor; 2279 tmp.port = mos7840_port->port->number; 2280 tmp.irq = 0; 2281 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 2282 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 2283 tmp.baud_base = 9600; 2284 tmp.close_delay = 5 * HZ; 2285 tmp.closing_wait = 30 * HZ; 2286 2287 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 2288 return -EFAULT; 2289 return 0; 2290 } 2291 2292 /***************************************************************************** 2293 * SerialIoctl 2294 * this function handles any ioctl calls to the driver 2295 *****************************************************************************/ 2296 2297 static int mos7840_ioctl(struct tty_struct *tty, struct file *file, 2298 unsigned int cmd, unsigned long arg) 2299 { 2300 struct usb_serial_port *port = tty->driver_data; 2301 void __user *argp = (void __user *)arg; 2302 struct moschip_port *mos7840_port; 2303 2304 struct async_icount cnow; 2305 struct async_icount cprev; 2306 struct serial_icounter_struct icount; 2307 int mosret = 0; 2308 2309 if (mos7840_port_paranoia_check(port, __func__)) { 2310 dbg("%s", "Invalid port \n"); 2311 return -1; 2312 } 2313 2314 mos7840_port = mos7840_get_port_private(port); 2315 2316 if (mos7840_port == NULL) 2317 return -1; 2318 2319 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); 2320 2321 switch (cmd) { 2322 /* return number of bytes available */ 2323 2324 case TIOCSERGETLSR: 2325 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number); 2326 return mos7840_get_lsr_info(tty, argp); 2327 return 0; 2328 2329 /* FIXME: use the modem hooks and remove this */ 2330 case TIOCMBIS: 2331 case TIOCMBIC: 2332 case TIOCMSET: 2333 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__, 2334 port->number); 2335 mosret = 2336 mos7840_set_modem_info(mos7840_port, cmd, argp); 2337 return mosret; 2338 2339 case TIOCMGET: 2340 dbg("%s (%d) TIOCMGET", __func__, port->number); 2341 return mos7840_get_modem_info(mos7840_port, argp); 2342 2343 case TIOCGSERIAL: 2344 dbg("%s (%d) TIOCGSERIAL", __func__, port->number); 2345 return mos7840_get_serial_info(mos7840_port, argp); 2346 2347 case TIOCSSERIAL: 2348 dbg("%s (%d) TIOCSSERIAL", __func__, port->number); 2349 break; 2350 2351 case TIOCMIWAIT: 2352 dbg("%s (%d) TIOCMIWAIT", __func__, port->number); 2353 cprev = mos7840_port->icount; 2354 while (1) { 2355 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */ 2356 mos7840_port->delta_msr_cond = 0; 2357 wait_event_interruptible(mos7840_port->delta_msr_wait, 2358 (mos7840_port-> 2359 delta_msr_cond == 1)); 2360 2361 /* see if a signal did it */ 2362 if (signal_pending(current)) 2363 return -ERESTARTSYS; 2364 cnow = mos7840_port->icount; 2365 smp_rmb(); 2366 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 2367 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 2368 return -EIO; /* no change => error */ 2369 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 2370 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 2371 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 2372 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 2373 return 0; 2374 } 2375 cprev = cnow; 2376 } 2377 /* NOTREACHED */ 2378 break; 2379 2380 case TIOCGICOUNT: 2381 cnow = mos7840_port->icount; 2382 smp_rmb(); 2383 icount.cts = cnow.cts; 2384 icount.dsr = cnow.dsr; 2385 icount.rng = cnow.rng; 2386 icount.dcd = cnow.dcd; 2387 icount.rx = cnow.rx; 2388 icount.tx = cnow.tx; 2389 icount.frame = cnow.frame; 2390 icount.overrun = cnow.overrun; 2391 icount.parity = cnow.parity; 2392 icount.brk = cnow.brk; 2393 icount.buf_overrun = cnow.buf_overrun; 2394 2395 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, 2396 port->number, icount.rx, icount.tx); 2397 if (copy_to_user(argp, &icount, sizeof(icount))) 2398 return -EFAULT; 2399 return 0; 2400 default: 2401 break; 2402 } 2403 return -ENOIOCTLCMD; 2404 } 2405 2406 static int mos7840_calc_num_ports(struct usb_serial *serial) 2407 { 2408 int mos7840_num_ports = 0; 2409 2410 dbg("numberofendpoints: %d \n", 2411 (int)serial->interface->cur_altsetting->desc.bNumEndpoints); 2412 dbg("numberofendpoints: %d \n", 2413 (int)serial->interface->altsetting->desc.bNumEndpoints); 2414 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) { 2415 mos7840_num_ports = serial->num_ports = 2; 2416 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) { 2417 serial->num_bulk_in = 4; 2418 serial->num_bulk_out = 4; 2419 mos7840_num_ports = serial->num_ports = 4; 2420 } 2421 2422 return mos7840_num_ports; 2423 } 2424 2425 /**************************************************************************** 2426 * mos7840_startup 2427 ****************************************************************************/ 2428 2429 static int mos7840_startup(struct usb_serial *serial) 2430 { 2431 struct moschip_port *mos7840_port; 2432 struct usb_device *dev; 2433 int i, status; 2434 2435 __u16 Data; 2436 dbg("%s \n", " mos7840_startup :entering.........."); 2437 2438 if (!serial) { 2439 dbg("%s\n", "Invalid Handler"); 2440 return -1; 2441 } 2442 2443 dev = serial->dev; 2444 2445 dbg("%s\n", "Entering..."); 2446 2447 /* we set up the pointers to the endpoints in the mos7840_open * 2448 * function, as the structures aren't created yet. */ 2449 2450 /* set up port private structures */ 2451 for (i = 0; i < serial->num_ports; ++i) { 2452 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2453 if (mos7840_port == NULL) { 2454 dev_err(&dev->dev, "%s - Out of memory\n", __func__); 2455 status = -ENOMEM; 2456 i--; /* don't follow NULL pointer cleaning up */ 2457 goto error; 2458 } 2459 2460 /* Initialize all port interrupt end point to port 0 int 2461 * endpoint. Our device has only one interrupt end point 2462 * common to all port */ 2463 2464 mos7840_port->port = serial->port[i]; 2465 mos7840_set_port_private(serial->port[i], mos7840_port); 2466 spin_lock_init(&mos7840_port->pool_lock); 2467 2468 mos7840_port->port_num = ((serial->port[i]->number - 2469 (serial->port[i]->serial->minor)) + 2470 1); 2471 2472 if (mos7840_port->port_num == 1) { 2473 mos7840_port->SpRegOffset = 0x0; 2474 mos7840_port->ControlRegOffset = 0x1; 2475 mos7840_port->DcrRegOffset = 0x4; 2476 } else if ((mos7840_port->port_num == 2) 2477 && (serial->num_ports == 4)) { 2478 mos7840_port->SpRegOffset = 0x8; 2479 mos7840_port->ControlRegOffset = 0x9; 2480 mos7840_port->DcrRegOffset = 0x16; 2481 } else if ((mos7840_port->port_num == 2) 2482 && (serial->num_ports == 2)) { 2483 mos7840_port->SpRegOffset = 0xa; 2484 mos7840_port->ControlRegOffset = 0xb; 2485 mos7840_port->DcrRegOffset = 0x19; 2486 } else if ((mos7840_port->port_num == 3) 2487 && (serial->num_ports == 4)) { 2488 mos7840_port->SpRegOffset = 0xa; 2489 mos7840_port->ControlRegOffset = 0xb; 2490 mos7840_port->DcrRegOffset = 0x19; 2491 } else if ((mos7840_port->port_num == 4) 2492 && (serial->num_ports == 4)) { 2493 mos7840_port->SpRegOffset = 0xc; 2494 mos7840_port->ControlRegOffset = 0xd; 2495 mos7840_port->DcrRegOffset = 0x1c; 2496 } 2497 mos7840_dump_serial_port(mos7840_port); 2498 mos7840_set_port_private(serial->port[i], mos7840_port); 2499 2500 /* enable rx_disable bit in control register */ 2501 status = mos7840_get_reg_sync(serial->port[i], 2502 mos7840_port->ControlRegOffset, &Data); 2503 if (status < 0) { 2504 dbg("Reading ControlReg failed status-0x%x\n", status); 2505 break; 2506 } else 2507 dbg("ControlReg Reading success val is %x, status%d\n", 2508 Data, status); 2509 Data |= 0x08; /* setting driver done bit */ 2510 Data |= 0x04; /* sp1_bit to have cts change reflect in 2511 modem status reg */ 2512 2513 /* Data |= 0x20; //rx_disable bit */ 2514 status = mos7840_set_reg_sync(serial->port[i], 2515 mos7840_port->ControlRegOffset, Data); 2516 if (status < 0) { 2517 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status); 2518 break; 2519 } else 2520 dbg("ControlReg Writing success(rx_disable) status%d\n", 2521 status); 2522 2523 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 2524 and 0x24 in DCR3 */ 2525 Data = 0x01; 2526 status = mos7840_set_reg_sync(serial->port[i], 2527 (__u16) (mos7840_port->DcrRegOffset + 0), Data); 2528 if (status < 0) { 2529 dbg("Writing DCR0 failed status-0x%x\n", status); 2530 break; 2531 } else 2532 dbg("DCR0 Writing success status%d\n", status); 2533 2534 Data = 0x05; 2535 status = mos7840_set_reg_sync(serial->port[i], 2536 (__u16) (mos7840_port->DcrRegOffset + 1), Data); 2537 if (status < 0) { 2538 dbg("Writing DCR1 failed status-0x%x\n", status); 2539 break; 2540 } else 2541 dbg("DCR1 Writing success status%d\n", status); 2542 2543 Data = 0x24; 2544 status = mos7840_set_reg_sync(serial->port[i], 2545 (__u16) (mos7840_port->DcrRegOffset + 2), Data); 2546 if (status < 0) { 2547 dbg("Writing DCR2 failed status-0x%x\n", status); 2548 break; 2549 } else 2550 dbg("DCR2 Writing success status%d\n", status); 2551 2552 /* write values in clkstart0x0 and clkmulti 0x20 */ 2553 Data = 0x0; 2554 status = mos7840_set_reg_sync(serial->port[i], 2555 CLK_START_VALUE_REGISTER, Data); 2556 if (status < 0) { 2557 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status); 2558 break; 2559 } else 2560 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status); 2561 2562 Data = 0x20; 2563 status = mos7840_set_reg_sync(serial->port[i], 2564 CLK_MULTI_REGISTER, Data); 2565 if (status < 0) { 2566 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n", 2567 status); 2568 goto error; 2569 } else 2570 dbg("CLK_MULTI_REGISTER Writing success status%d\n", 2571 status); 2572 2573 /* write value 0x0 to scratchpad register */ 2574 Data = 0x00; 2575 status = mos7840_set_uart_reg(serial->port[i], 2576 SCRATCH_PAD_REGISTER, Data); 2577 if (status < 0) { 2578 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", 2579 status); 2580 break; 2581 } else 2582 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n", 2583 status); 2584 2585 /* Zero Length flag register */ 2586 if ((mos7840_port->port_num != 1) 2587 && (serial->num_ports == 2)) { 2588 2589 Data = 0xff; 2590 status = mos7840_set_reg_sync(serial->port[i], 2591 (__u16) (ZLP_REG1 + 2592 ((__u16)mos7840_port->port_num)), Data); 2593 dbg("ZLIP offset%x\n", 2594 (__u16) (ZLP_REG1 + 2595 ((__u16) mos7840_port->port_num))); 2596 if (status < 0) { 2597 dbg("Writing ZLP_REG%d failed status-0x%x\n", 2598 i + 2, status); 2599 break; 2600 } else 2601 dbg("ZLP_REG%d Writing success status%d\n", 2602 i + 2, status); 2603 } else { 2604 Data = 0xff; 2605 status = mos7840_set_reg_sync(serial->port[i], 2606 (__u16) (ZLP_REG1 + 2607 ((__u16)mos7840_port->port_num) - 0x1), Data); 2608 dbg("ZLIP offset%x\n", 2609 (__u16) (ZLP_REG1 + 2610 ((__u16) mos7840_port->port_num) - 0x1)); 2611 if (status < 0) { 2612 dbg("Writing ZLP_REG%d failed status-0x%x\n", 2613 i + 1, status); 2614 break; 2615 } else 2616 dbg("ZLP_REG%d Writing success status%d\n", 2617 i + 1, status); 2618 2619 } 2620 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL); 2621 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL); 2622 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), 2623 GFP_KERNEL); 2624 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || 2625 !mos7840_port->dr) { 2626 status = -ENOMEM; 2627 goto error; 2628 } 2629 } 2630 2631 /* Zero Length flag enable */ 2632 Data = 0x0f; 2633 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data); 2634 if (status < 0) { 2635 dbg("Writing ZLP_REG5 failed status-0x%x\n", status); 2636 goto error; 2637 } else 2638 dbg("ZLP_REG5 Writing success status%d\n", status); 2639 2640 /* setting configuration feature to one */ 2641 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2642 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ); 2643 return 0; 2644 error: 2645 for (/* nothing */; i >= 0; i--) { 2646 mos7840_port = mos7840_get_port_private(serial->port[i]); 2647 2648 kfree(mos7840_port->dr); 2649 kfree(mos7840_port->ctrl_buf); 2650 usb_free_urb(mos7840_port->control_urb); 2651 kfree(mos7840_port); 2652 serial->port[i] = NULL; 2653 } 2654 return status; 2655 } 2656 2657 /**************************************************************************** 2658 * mos7840_shutdown 2659 * This function is called whenever the device is removed from the usb bus. 2660 ****************************************************************************/ 2661 2662 static void mos7840_shutdown(struct usb_serial *serial) 2663 { 2664 int i; 2665 unsigned long flags; 2666 struct moschip_port *mos7840_port; 2667 dbg("%s \n", " shutdown :entering.........."); 2668 2669 if (!serial) { 2670 dbg("%s", "Invalid Handler \n"); 2671 return; 2672 } 2673 2674 /* check for the ports to be closed,close the ports and disconnect */ 2675 2676 /* free private structure allocated for serial port * 2677 * stop reads and writes on all ports */ 2678 2679 for (i = 0; i < serial->num_ports; ++i) { 2680 mos7840_port = mos7840_get_port_private(serial->port[i]); 2681 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 2682 mos7840_port->zombie = 1; 2683 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 2684 usb_kill_urb(mos7840_port->control_urb); 2685 kfree(mos7840_port->ctrl_buf); 2686 kfree(mos7840_port->dr); 2687 kfree(mos7840_port); 2688 mos7840_set_port_private(serial->port[i], NULL); 2689 } 2690 2691 dbg("%s\n", "Thank u :: "); 2692 2693 } 2694 2695 static struct usb_driver io_driver = { 2696 .name = "mos7840", 2697 .probe = usb_serial_probe, 2698 .disconnect = usb_serial_disconnect, 2699 .id_table = moschip_id_table_combined, 2700 .no_dynamic_id = 1, 2701 }; 2702 2703 static struct usb_serial_driver moschip7840_4port_device = { 2704 .driver = { 2705 .owner = THIS_MODULE, 2706 .name = "mos7840", 2707 }, 2708 .description = DRIVER_DESC, 2709 .usb_driver = &io_driver, 2710 .id_table = moschip_port_id_table, 2711 .num_ports = 4, 2712 .open = mos7840_open, 2713 .close = mos7840_close, 2714 .write = mos7840_write, 2715 .write_room = mos7840_write_room, 2716 .chars_in_buffer = mos7840_chars_in_buffer, 2717 .throttle = mos7840_throttle, 2718 .unthrottle = mos7840_unthrottle, 2719 .calc_num_ports = mos7840_calc_num_ports, 2720 #ifdef MCSSerialProbe 2721 .probe = mos7840_serial_probe, 2722 #endif 2723 .ioctl = mos7840_ioctl, 2724 .set_termios = mos7840_set_termios, 2725 .break_ctl = mos7840_break, 2726 .tiocmget = mos7840_tiocmget, 2727 .tiocmset = mos7840_tiocmset, 2728 .attach = mos7840_startup, 2729 .shutdown = mos7840_shutdown, 2730 .read_bulk_callback = mos7840_bulk_in_callback, 2731 .read_int_callback = mos7840_interrupt_callback, 2732 }; 2733 2734 /**************************************************************************** 2735 * moschip7840_init 2736 * This is called by the module subsystem, or on startup to initialize us 2737 ****************************************************************************/ 2738 static int __init moschip7840_init(void) 2739 { 2740 int retval; 2741 2742 dbg("%s \n", " mos7840_init :entering.........."); 2743 2744 /* Register with the usb serial */ 2745 retval = usb_serial_register(&moschip7840_4port_device); 2746 2747 if (retval) 2748 goto failed_port_device_register; 2749 2750 dbg("%s\n", "Entring..."); 2751 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 2752 DRIVER_DESC "\n"); 2753 2754 /* Register with the usb */ 2755 retval = usb_register(&io_driver); 2756 if (retval == 0) { 2757 dbg("%s\n", "Leaving..."); 2758 return 0; 2759 } 2760 usb_serial_deregister(&moschip7840_4port_device); 2761 failed_port_device_register: 2762 return retval; 2763 } 2764 2765 /**************************************************************************** 2766 * moschip7840_exit 2767 * Called when the driver is about to be unloaded. 2768 ****************************************************************************/ 2769 static void __exit moschip7840_exit(void) 2770 { 2771 2772 dbg("%s \n", " mos7840_exit :entering.........."); 2773 2774 usb_deregister(&io_driver); 2775 2776 usb_serial_deregister(&moschip7840_4port_device); 2777 2778 dbg("%s\n", "Entring..."); 2779 } 2780 2781 module_init(moschip7840_init); 2782 module_exit(moschip7840_exit); 2783 2784 /* Module information */ 2785 MODULE_DESCRIPTION(DRIVER_DESC); 2786 MODULE_LICENSE("GPL"); 2787 2788 module_param(debug, bool, S_IRUGO | S_IWUSR); 2789 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2790